libata-core.c 184.1 KB
Newer Older
L
Linus Torvalds 已提交
1
/*
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
L
Linus Torvalds 已提交
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
50
#include <linux/jiffies.h>
51
#include <linux/scatterlist.h>
L
Linus Torvalds 已提交
52
#include <scsi/scsi.h>
53
#include <scsi/scsi_cmnd.h>
L
Linus Torvalds 已提交
54 55 56 57 58 59 60 61
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>

#include "libata.h"

62

63
/* debounce timing parameters in msecs { interval, duration, timeout } */
64 65 66
const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
67

T
Tejun Heo 已提交
68 69 70
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
71
static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable);
T
Tejun Heo 已提交
72
static void ata_dev_xfermask(struct ata_device *dev);
T
Tejun Heo 已提交
73
static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
L
Linus Torvalds 已提交
74

75
unsigned int ata_print_id = 1;
L
Linus Torvalds 已提交
76 77
static struct workqueue_struct *ata_wq;

78 79
struct workqueue_struct *ata_aux_wq;

J
Jeff Garzik 已提交
80
int atapi_enabled = 1;
81 82 83
module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");

84 85 86 87
int atapi_dmadir = 0;
module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");

88 89 90 91
int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");

J
Jeff Garzik 已提交
92 93 94 95
int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");

A
Alan Cox 已提交
96 97 98 99
static int ata_ignore_hpa = 0;
module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");

100 101 102 103
static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
module_param_named(dma, libata_dma_mask, int, 0444);
MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");

A
Andrew Morton 已提交
104 105 106 107
static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
module_param(ata_probe_timeout, int, 0444);
MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");

J
Jeff Garzik 已提交
108
int libata_noacpi = 0;
109
module_param_named(noacpi, libata_noacpi, int, 0444);
J
Jeff Garzik 已提交
110
MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
111

L
Linus Torvalds 已提交
112 113 114 115 116
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

E
Edward Falk 已提交
117

L
Linus Torvalds 已提交
118 119 120 121
/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@pmp: Port multiplier port
122 123
 *	@is_cmd: This FIS is for command
 *	@fis: Buffer into which data will output
L
Linus Torvalds 已提交
124 125 126 127 128 129 130
 *
 *	Converts a standard ATA taskfile to a Serial ATA
 *	FIS structure (Register - Host to Device).
 *
 *	LOCKING:
 *	Inherited from caller.
 */
131
void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
L
Linus Torvalds 已提交
132
{
133 134 135 136 137
	fis[0] = 0x27;			/* Register - Host to Device FIS */
	fis[1] = pmp & 0xf;		/* Port multiplier number*/
	if (is_cmd)
		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */

L
Linus Torvalds 已提交
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
	fis[2] = tf->command;
	fis[3] = tf->feature;

	fis[4] = tf->lbal;
	fis[5] = tf->lbam;
	fis[6] = tf->lbah;
	fis[7] = tf->device;

	fis[8] = tf->hob_lbal;
	fis[9] = tf->hob_lbam;
	fis[10] = tf->hob_lbah;
	fis[11] = tf->hob_feature;

	fis[12] = tf->nsect;
	fis[13] = tf->hob_nsect;
	fis[14] = 0;
	fis[15] = tf->ctl;

	fis[16] = 0;
	fis[17] = 0;
	fis[18] = 0;
	fis[19] = 0;
}

/**
 *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
 *	@fis: Buffer from which data will be input
 *	@tf: Taskfile to output
 *
167
 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
L
Linus Torvalds 已提交
168 169 170 171 172
 *
 *	LOCKING:
 *	Inherited from caller.
 */

J
Jeff Garzik 已提交
173
void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
L
Linus Torvalds 已提交
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
{
	tf->command	= fis[2];	/* status */
	tf->feature	= fis[3];	/* error */

	tf->lbal	= fis[4];
	tf->lbam	= fis[5];
	tf->lbah	= fis[6];
	tf->device	= fis[7];

	tf->hob_lbal	= fis[8];
	tf->hob_lbam	= fis[9];
	tf->hob_lbah	= fis[10];

	tf->nsect	= fis[12];
	tf->hob_nsect	= fis[13];
}

191 192 193 194 195 196
static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
T
Tejun Heo 已提交
197 198 199 200
	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
201 202 203 204 205
	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
T
Tejun Heo 已提交
206 207 208 209
	0,
	0,
	0,
	0,
210 211 212 213
	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
T
Tejun Heo 已提交
214 215 216 217 218
	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
219
};
L
Linus Torvalds 已提交
220 221

/**
222
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
223 224
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
L
Linus Torvalds 已提交
225
 *
226
 *	Examine the device configuration and tf->flags to calculate
227
 *	the proper read/write commands and protocol to use.
L
Linus Torvalds 已提交
228 229 230 231
 *
 *	LOCKING:
 *	caller.
 */
232
static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
L
Linus Torvalds 已提交
233
{
T
Tejun Heo 已提交
234
	u8 cmd;
L
Linus Torvalds 已提交
235

T
Tejun Heo 已提交
236
	int index, fua, lba48, write;
237

T
Tejun Heo 已提交
238
	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
239 240
	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
L
Linus Torvalds 已提交
241

242 243
	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
244
		index = dev->multi_count ? 0 : 8;
T
Tejun Heo 已提交
245
	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
246 247
		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
248
		index = dev->multi_count ? 0 : 8;
249 250
	} else {
		tf->protocol = ATA_PROT_DMA;
T
Tejun Heo 已提交
251
		index = 16;
252
	}
L
Linus Torvalds 已提交
253

T
Tejun Heo 已提交
254 255 256 257 258 259
	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
L
Linus Torvalds 已提交
260 261
}

262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
/**
 *	ata_tf_read_block - Read block address from ATA taskfile
 *	@tf: ATA taskfile of interest
 *	@dev: ATA device @tf belongs to
 *
 *	LOCKING:
 *	None.
 *
 *	Read block address from @tf.  This function can handle all
 *	three address formats - LBA, LBA48 and CHS.  tf->protocol and
 *	flags select the address format to use.
 *
 *	RETURNS:
 *	Block address read from @tf.
 */
u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
{
	u64 block = 0;

	if (tf->flags & ATA_TFLAG_LBA) {
		if (tf->flags & ATA_TFLAG_LBA48) {
			block |= (u64)tf->hob_lbah << 40;
			block |= (u64)tf->hob_lbam << 32;
			block |= tf->hob_lbal << 24;
		} else
			block |= (tf->device & 0xf) << 24;

		block |= tf->lbah << 16;
		block |= tf->lbam << 8;
		block |= tf->lbal;
	} else {
		u32 cyl, head, sect;

		cyl = tf->lbam | (tf->lbah << 8);
		head = tf->device & 0xf;
		sect = tf->lbal;

		block = (cyl * dev->heads + head) * dev->sectors + sect;
	}

	return block;
}

305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331
/**
 *	ata_build_rw_tf - Build ATA taskfile for given read/write request
 *	@tf: Target ATA taskfile
 *	@dev: ATA device @tf belongs to
 *	@block: Block address
 *	@n_block: Number of blocks
 *	@tf_flags: RW/FUA etc...
 *	@tag: tag
 *
 *	LOCKING:
 *	None.
 *
 *	Build ATA taskfile @tf for read/write request described by
 *	@block, @n_block, @tf_flags and @tag on @dev.
 *
 *	RETURNS:
 *
 *	0 on success, -ERANGE if the request is too large for @dev,
 *	-EINVAL if the request is invalid.
 */
int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
		    u64 block, u32 n_block, unsigned int tf_flags,
		    unsigned int tag)
{
	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf->flags |= tf_flags;

332
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427
		/* yay, NCQ */
		if (!lba_48_ok(block, n_block))
			return -ERANGE;

		tf->protocol = ATA_PROT_NCQ;
		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;

		if (tf->flags & ATA_TFLAG_WRITE)
			tf->command = ATA_CMD_FPDMA_WRITE;
		else
			tf->command = ATA_CMD_FPDMA_READ;

		tf->nsect = tag << 3;
		tf->hob_feature = (n_block >> 8) & 0xff;
		tf->feature = n_block & 0xff;

		tf->hob_lbah = (block >> 40) & 0xff;
		tf->hob_lbam = (block >> 32) & 0xff;
		tf->hob_lbal = (block >> 24) & 0xff;
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device = 1 << 6;
		if (tf->flags & ATA_TFLAG_FUA)
			tf->device |= 1 << 7;
	} else if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

		if (lba_28_ok(block, n_block)) {
			/* use LBA28 */
			tf->device |= (block >> 24) & 0xf;
		} else if (lba_48_ok(block, n_block)) {
			if (!(dev->flags & ATA_DFLAG_LBA48))
				return -ERANGE;

			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;

			tf->hob_nsect = (n_block >> 8) & 0xff;

			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
		} else
			/* request too large even for LBA48 */
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		tf->nsect = n_block & 0xff;

		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device |= ATA_LBA;
	} else {
		/* CHS */
		u32 sect, head, cyl, track;

		/* The request -may- be too large for CHS addressing. */
		if (!lba_28_ok(block, n_block))
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
			(u32)block, track, cyl, head, sect);

		/* Check whether the converted CHS can fit.
		   Cylinder: 0-65535
		   Head: 0-15
		   Sector: 1-255*/
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
			return -ERANGE;

		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
	}

	return 0;
}

428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451
/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
static unsigned int ata_pack_xfermask(unsigned int pio_mask,
				      unsigned int mwdma_mask,
				      unsigned int udma_mask)
{
	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}

452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
/**
 *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 *	@xfer_mask: xfer_mask to unpack
 *	@pio_mask: resulting pio_mask
 *	@mwdma_mask: resulting mwdma_mask
 *	@udma_mask: resulting udma_mask
 *
 *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 *	Any NULL distination masks will be ignored.
 */
static void ata_unpack_xfermask(unsigned int xfer_mask,
				unsigned int *pio_mask,
				unsigned int *mwdma_mask,
				unsigned int *udma_mask)
{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

475
static const struct ata_xfer_ent {
476
	int shift, bits;
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
	u8 base;
} ata_xfer_tbl[] = {
	{ ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching XFER_* value, 0 if no match found.
 */
static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
{
	int highbit = fls(xfer_mask) - 1;
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
			return ent->base + highbit - ent->shift;
	return 0;
}

/**
 *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_mask for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mask, 0 if no match found.
 */
static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
			return 1 << (ent->shift + xfer_mode - ent->base);
	return 0;
}

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
static int ata_xfer_mode2shift(unsigned int xfer_mode)
{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
			return ent->shift;
	return -1;
}

L
Linus Torvalds 已提交
553
/**
554 555
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
L
Linus Torvalds 已提交
556 557
 *
 *	Determine string which represents the highest speed
558
 *	(highest bit in @modemask).
L
Linus Torvalds 已提交
559 560 561 562 563 564
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
565
 *	@mode_mask, or the constant C string "<n/a>".
L
Linus Torvalds 已提交
566
 */
567
static const char *ata_mode_string(unsigned int xfer_mask)
L
Linus Torvalds 已提交
568
{
569 570 571 572 573 574
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
575 576
		"PIO5",
		"PIO6",
577 578 579
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
580 581
		"MWDMA3",
		"MWDMA4",
582 583 584 585 586 587 588 589 590
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
591
	int highbit;
L
Linus Torvalds 已提交
592

593 594 595
	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
L
Linus Torvalds 已提交
596 597 598
	return "<n/a>";
}

599 600 601 602 603 604 605 606 607 608 609 610
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
	};

	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
		return "<unknown>";
	return spd_str[spd - 1];
}

T
Tejun Heo 已提交
611
void ata_dev_disable(struct ata_device *dev)
612
{
T
Tejun Heo 已提交
613
	if (ata_dev_enabled(dev)) {
T
Tejun Heo 已提交
614
		if (ata_msg_drv(dev->link->ap))
T
Tejun Heo 已提交
615
			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
616 617
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
618 619 620 621
		dev->class++;
	}
}

L
Linus Torvalds 已提交
622
/**
T
Tejun Heo 已提交
623
 *	ata_devchk - PATA device presence detection
L
Linus Torvalds 已提交
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
 *
 *	This technique was originally described in
 *	Hale Landis's ATADRVR (www.ata-atapi.com), and
 *	later found its way into the ATA/ATAPI spec.
 *
 *	Write a pattern to the ATA shadow registers,
 *	and if a device is present, it will respond by
 *	correctly storing and echoing back the
 *	ATA shadow register contents.
 *
 *	LOCKING:
 *	caller.
 */

T
Tejun Heo 已提交
640
static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
L
Linus Torvalds 已提交
641 642 643 644 645 646
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

	ap->ops->dev_select(ap, device);

T
Tejun Heo 已提交
647 648
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
649

T
Tejun Heo 已提交
650 651
	iowrite8(0xaa, ioaddr->nsect_addr);
	iowrite8(0x55, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
652

T
Tejun Heo 已提交
653 654
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
655

T
Tejun Heo 已提交
656 657
	nsect = ioread8(ioaddr->nsect_addr);
	lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_dev_classify - determine device type based on ATA-spec signature
 *	@tf: ATA taskfile register set for device to be identified
 *
 *	Determine from taskfile register contents whether a device is
 *	ATA or ATAPI, as per "Signature and persistence" section
 *	of ATA/PI spec (volume 1, sect 5.14).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
677 678
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
L
Linus Torvalds 已提交
679
 */
J
Jeff Garzik 已提交
680
unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
Linus Torvalds 已提交
681 682 683 684
{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
685 686 687 688 689 690 691 692 693 694 695 696 697 698
	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
L
Linus Torvalds 已提交
699
	 */
700
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
Linus Torvalds 已提交
701 702 703 704
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

705
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
L
Linus Torvalds 已提交
706 707 708 709
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

710 711 712 713 714 715 716 717 718 719
	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
		DPRINTK("found PMP device by sig\n");
		return ATA_DEV_PMP;
	}

	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
		printk("ata: SEMB device ignored\n");
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

L
Linus Torvalds 已提交
720 721 722 723 724 725
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
726 727
 *	@dev: ATA device to classify (starting at zero)
 *	@present: device seems present
728
 *	@r_err: Value of error register on completion
L
Linus Torvalds 已提交
729 730 731 732 733 734 735 736 737 738 739 740
 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
741 742 743
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
L
Linus Torvalds 已提交
744
 */
745 746
unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
				  u8 *r_err)
L
Linus Torvalds 已提交
747
{
748
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
749 750 751 752
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

753
	ap->ops->dev_select(ap, dev->devno);
L
Linus Torvalds 已提交
754 755 756 757

	memset(&tf, 0, sizeof(tf));

	ap->ops->tf_read(ap, &tf);
758
	err = tf.feature;
759 760
	if (r_err)
		*r_err = err;
L
Linus Torvalds 已提交
761

762
	/* see if device passed diags: if master then continue and warn later */
763
	if (err == 0 && dev->devno == 0)
764
		/* diagnostic fail : do nothing _YET_ */
765
		dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
766
	else if (err == 1)
L
Linus Torvalds 已提交
767
		/* do nothing */ ;
768
	else if ((dev->devno == 0) && (err == 0x81))
L
Linus Torvalds 已提交
769 770
		/* do nothing */ ;
	else
771
		return ATA_DEV_NONE;
L
Linus Torvalds 已提交
772

773
	/* determine if device is ATA or ATAPI */
L
Linus Torvalds 已提交
774
	class = ata_dev_classify(&tf);
775

776 777 778 779 780 781 782 783 784 785 786 787 788 789
	if (class == ATA_DEV_UNKNOWN) {
		/* If the device failed diagnostic, it's likely to
		 * have reported incorrect device signature too.
		 * Assume ATA device if the device seems present but
		 * device signature is invalid with diagnostic
		 * failure.
		 */
		if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
			class = ATA_DEV_ATA;
		else
			class = ATA_DEV_NONE;
	} else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
		class = ATA_DEV_NONE;

790
	return class;
L
Linus Torvalds 已提交
791 792 793
}

/**
794
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
Linus Torvalds 已提交
795 796 797 798 799 800 801 802 803 804 805 806 807
 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an even number.
 *
 *	The strings in the IDENTIFY DEVICE page are broken up into
 *	16-bit chunks.  Run through the string, and output each
 *	8-bit chunk linearly, regardless of platform.
 *
 *	LOCKING:
 *	caller.
 */

808 809
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
Linus Torvalds 已提交
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
{
	unsigned int c;

	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

		c = id[ofs] & 0xff;
		*s = c;
		s++;

		ofs++;
		len -= 2;
	}
}

827
/**
828
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
829 830 831 832 833
 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an odd number.
 *
834
 *	This function is identical to ata_id_string except that it
835 836 837 838 839 840
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
841 842
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
843 844 845 846 847
{
	unsigned char *p;

	WARN_ON(!(len & 1));

848
	ata_id_string(id, s, ofs, len - 1);
849 850 851 852 853 854

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
Edward Falk 已提交
855

T
Tejun Heo 已提交
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

A
Alan Cox 已提交
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897
static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
	sectors |= (tf->hob_lbal & 0xff) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

	return ++sectors;
}

static u64 ata_tf_to_lba(struct ata_taskfile *tf)
{
	u64 sectors = 0;

	sectors |= (tf->device & 0x0f) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

	return ++sectors;
}

/**
898 899 900
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
Alan Cox 已提交
901
 *
902 903
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
Alan Cox 已提交
904
 *
905 906 907
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
Alan Cox 已提交
908
 */
909
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
910
{
911
	unsigned int err_mask;
A
Alan Cox 已提交
912
	struct ata_taskfile tf;
913
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
914 915 916

	ata_tf_init(dev, &tf);

917
	/* always clear all address registers */
A
Alan Cox 已提交
918 919
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

920 921 922 923 924
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
Alan Cox 已提交
925 926

	tf.protocol |= ATA_PROT_NODATA;
927 928
	tf.device |= ATA_LBA;

929
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
930 931 932 933 934 935 936
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
A
Alan Cox 已提交
937

938 939 940 941
	if (lba48)
		*max_sectors = ata_tf_to_lba48(&tf);
	else
		*max_sectors = ata_tf_to_lba(&tf);
942 943
        if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
		(*max_sectors)--;
944
	return 0;
A
Alan Cox 已提交
945 946 947
}

/**
948 949
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
950
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
951
 *
952 953 954 955 956 957
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
Alan Cox 已提交
958
 */
T
Tejun Heo 已提交
959
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
960
{
961
	unsigned int err_mask;
A
Alan Cox 已提交
962
	struct ata_taskfile tf;
963
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
964 965 966 967 968 969

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
970 971 972 973 974 975 976 977

	if (lba48) {
		tf.command = ATA_CMD_SET_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
T
Tejun Heo 已提交
978
	} else {
979 980
		tf.command = ATA_CMD_SET_MAX;

T
Tejun Heo 已提交
981 982 983
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
984
	tf.protocol |= ATA_PROT_NODATA;
985
	tf.device |= ATA_LBA;
A
Alan Cox 已提交
986 987 988 989 990

	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;

991
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
992 993 994 995 996 997 998 999 1000 1001
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
A
Alan Cox 已提交
1002 1003 1004 1005 1006 1007 1008 1009 1010
}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
T
Tejun Heo 已提交
1011 1012 1013
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
Alan Cox 已提交
1014
 */
T
Tejun Heo 已提交
1015
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1016
{
T
Tejun Heo 已提交
1017 1018 1019 1020
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1021
	int rc;
J
Jeff Garzik 已提交
1022

T
Tejun Heo 已提交
1023 1024 1025 1026
	/* do we need to do it? */
	if (dev->class != ATA_DEV_ATA ||
	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1027
		return 0;
A
Alan Cox 已提交
1028

T
Tejun Heo 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
		/* If HPA isn't going to be unlocked, skip HPA
		 * resizing from the next try.
		 */
		if (!ata_ignore_hpa) {
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
				       "broken, will skip HPA handling\n");
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
Alan Cox 已提交
1043
		}
T
Tejun Heo 已提交
1044

T
Tejun Heo 已提交
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
		return rc;
	}

	/* nothing to do? */
	if (native_sectors <= sectors || !ata_ignore_hpa) {
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
			ata_dev_printk(dev, KERN_INFO,
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
			ata_dev_printk(dev, KERN_WARNING,
				"native sectors (%llu) is smaller than "
				"sectors (%llu)\n",
				(unsigned long long)native_sectors,
				(unsigned long long)sectors);
		return 0;
	}

	/* let's unlock HPA */
	rc = ata_set_max_sectors(dev, native_sectors);
	if (rc == -EACCES) {
		/* if device aborted the command, skip HPA resizing */
		ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
			       "(%llu -> %llu), skipping HPA handling\n",
			       (unsigned long long)sectors,
			       (unsigned long long)native_sectors);
		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
		return 0;
	} else if (rc)
		return rc;

	/* re-read IDENTIFY data */
	rc = ata_dev_reread_id(dev, 0);
	if (rc) {
		ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
			       "data after HPA resizing\n");
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
		ata_dev_printk(dev, KERN_INFO,
			"HPA unlocked: %llu -> %llu, native %llu\n",
			(unsigned long long)sectors,
			(unsigned long long)new_sectors,
			(unsigned long long)native_sectors);
	}

	return 0;
A
Alan Cox 已提交
1098 1099
}

1100 1101 1102
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
R
Randy Dunlap 已提交
1103
 *	@unknown: mode to assume if we cannot tell
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
 *
 *	Set up the timing values for the device based upon the identify
 *	reported values for the DMA mode. This function is used by drivers
 *	which rely upon firmware configured modes, but wish to report the
 *	mode correctly when possible.
 *
 *	In addition we emit similarly formatted messages to the default
 *	ata_dev_set_mode handler, in order to provide consistency of
 *	presentation.
 */

void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
{
	unsigned int mask;
	u8 mode;

	/* Pack the DMA modes */
	mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
	if (dev->id[53] & 0x04)
		mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;

	/* Select the mode in use */
	mode = ata_xfer_mask2mode(mask);

	if (mode != 0) {
		ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(mask));
	} else {
		/* SWDMA perhaps ? */
		mode = unknown;
		ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
	}

	/* Configure the device reporting */
	dev->xfer_mode = mode;
	dev->xfer_shift = ata_xfer_mode2shift(mode);
}

E
Edward Falk 已提交
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
/**
 *	ata_noop_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *
 *	This function performs no actual function.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
 *
 *	LOCKING:
 *	caller.
 */
L
Linus Torvalds 已提交
1154 1155 1156 1157
void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
{
}

E
Edward Falk 已提交
1158

L
Linus Torvalds 已提交
1159 1160 1161 1162 1163 1164 1165
/**
 *	ata_std_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *
 *	Use the method defined in the ATA specification to
 *	make either device 0, or device 1, active on the
E
Edward Falk 已提交
1166 1167 1168
 *	ATA channel.  Works with both PIO and MMIO.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
L
Linus Torvalds 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
 *
 *	LOCKING:
 *	caller.
 */

void ata_std_dev_select (struct ata_port *ap, unsigned int device)
{
	u8 tmp;

	if (device == 0)
		tmp = ATA_DEVICE_OBS;
	else
		tmp = ATA_DEVICE_OBS | ATA_DEV1;

T
Tejun Heo 已提交
1183
	iowrite8(tmp, ap->ioaddr.device_addr);
L
Linus Torvalds 已提交
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
	ata_pause(ap);		/* needed; also flushes, for mmio */
}

/**
 *	ata_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *	@wait: non-zero to wait for Status register BSY bit to clear
 *	@can_sleep: non-zero if context allows sleeping
 *
 *	Use the method defined in the ATA specification to
 *	make either device 0, or device 1, active on the
 *	ATA channel.
 *
 *	This is a high-level version of ata_std_dev_select(),
 *	which additionally provides the services of inserting
 *	the proper pauses and status polling, where needed.
 *
 *	LOCKING:
 *	caller.
 */

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
T
Tejun Heo 已提交
1209
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1210 1211
		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
L
Linus Torvalds 已提交
1212 1213 1214 1215 1216 1217 1218

	if (wait)
		ata_wait_idle(ap);

	ap->ops->dev_select(ap, device);

	if (wait) {
T
Tejun Heo 已提交
1219
		if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
L
Linus Torvalds 已提交
1220 1221 1222 1223 1224 1225 1226
			msleep(150);
		ata_wait_idle(ap);
	}
}

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1227
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1228
 *
1229 1230
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1231 1232 1233 1234 1235
 *
 *	LOCKING:
 *	caller.
 */

1236
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1237 1238 1239 1240 1241 1242
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1243 1244 1245 1246 1247
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1248 1249 1250 1251 1252
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1253 1254 1255 1256 1257
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1258 1259
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1260 1261
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1262 1263
}

1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
static unsigned int ata_id_xfermask(const u16 *id)
{
	unsigned int pio_mask, mwdma_mask, udma_mask;

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1293
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1294 1295 1296 1297
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307

		/* But wait.. there's more. Design your standards by
		 * committee and you too can get a free iordy field to
		 * process. However its the speeds not the modes that
		 * are supported... Note drivers using the timing API
		 * will get this right anyway
		 */
	}

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1308

1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
		int pio = id[163] & 0x7;
		int dma = (id[163] >> 3) & 7;

		if (pio)
			pio_mask |= (1 << 5);
		if (pio > 1)
			pio_mask |= (1 << 6);
		if (dma)
			mwdma_mask |= (1 << 3);
		if (dma > 1)
			mwdma_mask |= (1 << 4);
	}

1326 1327 1328
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1329 1330 1331 1332

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1333 1334 1335
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1336
 *	@fn: workqueue function to be scheduled
1337
 *	@data: data for @fn to use
1338
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
 *	port_task and EH.  ata_port_queue_task() may be ignored for EH
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
1352
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1353 1354
			 unsigned long delay)
{
1355 1356
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
Tejun Heo 已提交
1357

1358 1359
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
}

/**
 *	ata_port_flush_task - Flush port_task
 *	@ap: The ata_port to flush port_task for
 *
 *	After this function completes, port_task is guranteed not to
 *	be running or scheduled.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
void ata_port_flush_task(struct ata_port *ap)
{
	DPRINTK("ENTER\n");

1376
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1377

1378 1379
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
Tejun Heo 已提交
1380 1381
}

1382
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1383
{
1384
	struct completion *waiting = qc->private_data;
1385 1386 1387 1388 1389

	complete(waiting);
}

/**
1390
 *	ata_exec_internal_sg - execute libata internal command
1391 1392
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1393
 *	@cdb: CDB for packet command
1394
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1395
 *	@sgl: sg list for the data buffer of the command
1396
 *	@n_elem: Number of sg entries
1397
 *	@timeout: Timeout in msecs (0 for default)
1398 1399 1400 1401 1402 1403 1404 1405 1406
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1407 1408 1409
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1410
 */
1411 1412
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1413
			      int dma_dir, struct scatterlist *sgl,
1414
			      unsigned int n_elem, unsigned long timeout)
1415
{
T
Tejun Heo 已提交
1416 1417
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1418 1419
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1420
	unsigned int tag, preempted_tag;
1421
	u32 preempted_sactive, preempted_qc_active;
1422
	int preempted_nr_active_links;
1423
	DECLARE_COMPLETION_ONSTACK(wait);
1424
	unsigned long flags;
1425
	unsigned int err_mask;
1426
	int rc;
1427

1428
	spin_lock_irqsave(ap->lock, flags);
1429

1430
	/* no internal command while frozen */
1431
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1432
		spin_unlock_irqrestore(ap->lock, flags);
1433 1434 1435
		return AC_ERR_SYSTEM;
	}

1436
	/* initialize internal qc */
1437

1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

1448
	if (test_and_set_bit(tag, &ap->qc_allocated))
1449
		BUG();
1450
	qc = __ata_qc_from_tag(ap, tag);
1451 1452 1453 1454 1455 1456 1457

	qc->tag = tag;
	qc->scsicmd = NULL;
	qc->ap = ap;
	qc->dev = dev;
	ata_qc_reinit(qc);

T
Tejun Heo 已提交
1458 1459
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1460
	preempted_qc_active = ap->qc_active;
1461
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1462 1463
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1464
	ap->qc_active = 0;
1465
	ap->nr_active_links = 0;
1466 1467

	/* prepare & issue qc */
1468
	qc->tf = *tf;
1469 1470
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1471
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1472 1473
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1474
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1475
		struct scatterlist *sg;
1476

J
Jens Axboe 已提交
1477 1478
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1479

J
Jens Axboe 已提交
1480
		ata_sg_init(qc, sgl, n_elem);
1481
		qc->nbytes = buflen;
1482 1483
	}

1484
	qc->private_data = &wait;
1485 1486
	qc->complete_fn = ata_qc_complete_internal;

1487
	ata_qc_issue(qc);
1488

1489
	spin_unlock_irqrestore(ap->lock, flags);
1490

1491 1492 1493 1494
	if (!timeout)
		timeout = ata_probe_timeout * 1000 / HZ;

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1495 1496

	ata_port_flush_task(ap);
1497

1498
	if (!rc) {
1499
		spin_lock_irqsave(ap->lock, flags);
1500 1501 1502

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1503 1504
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1505
		 */
1506
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1507 1508 1509 1510 1511 1512
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1513

1514 1515
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1516
					"qc timeout (cmd 0x%x)\n", command);
1517 1518
		}

1519
		spin_unlock_irqrestore(ap->lock, flags);
1520 1521
	}

1522 1523 1524 1525
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

		if (!qc->err_mask)
			qc->err_mask |= AC_ERR_OTHER;

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1536 1537
	}

1538
	/* finish up */
1539
	spin_lock_irqsave(ap->lock, flags);
1540

1541
	*tf = qc->result_tf;
1542 1543 1544
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1545 1546
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1547
	ap->qc_active = preempted_qc_active;
1548
	ap->nr_active_links = preempted_nr_active_links;
1549

1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1561
	if (ap->flags & ATA_FLAG_DISABLED) {
1562 1563 1564 1565
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1566
	spin_unlock_irqrestore(ap->lock, flags);
1567

1568
	return err_mask;
1569 1570
}

1571
/**
1572
 *	ata_exec_internal - execute libata internal command
1573 1574 1575 1576 1577 1578
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
1579
 *	@timeout: Timeout in msecs (0 for default)
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
1592 1593
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1594
{
1595 1596
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1597

1598 1599 1600 1601 1602 1603
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1604

1605 1606
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1607 1608
}

1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1622
 */
1623
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1624 1625 1626 1627 1628 1629 1630 1631 1632
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = cmd;
	tf.flags |= ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;

1633
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1634 1635
}

1636 1637 1638 1639 1640 1641 1642
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
J
Jeff Garzik 已提交
1643

1644 1645
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1646 1647
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1648
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1649
		return 0;
A
Alan Cox 已提交
1650 1651 1652 1653 1654
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1655
		return 1;
A
Alan Cox 已提交
1656 1657
	return 0;
}
1658

A
Alan Cox 已提交
1659 1660 1661 1662 1663 1664 1665
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
J
Jeff Garzik 已提交
1666

A
Alan Cox 已提交
1667 1668
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1669 1670
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1671
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1672 1673 1674 1675
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1676 1677
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1678 1679
		}
	}
A
Alan Cox 已提交
1680
	return 3 << ATA_SHIFT_PIO;
1681 1682
}

L
Linus Torvalds 已提交
1683
/**
1684 1685 1686
 *	ata_dev_read_id - Read ID data from the specified device
 *	@dev: target device
 *	@p_class: pointer to class of the target device (may be changed)
1687
 *	@flags: ATA_READID_* flags
1688
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1689
 *
1690 1691
 *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
 *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
T
Tejun Heo 已提交
1692 1693
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1694
 *
1695 1696 1697
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
 *	now we abort if we hit that case. 
 *
L
Linus Torvalds 已提交
1698
 *	LOCKING:
1699 1700 1701 1702
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1703
 */
1704
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1705
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1706
{
T
Tejun Heo 已提交
1707
	struct ata_port *ap = dev->link->ap;
1708
	unsigned int class = *p_class;
1709
	struct ata_taskfile tf;
1710 1711
	unsigned int err_mask = 0;
	const char *reason;
1712
	int may_fallback = 1, tried_spinup = 0;
1713
	int rc;
L
Linus Torvalds 已提交
1714

1715
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1716
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1717

1718 1719
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1720
	ata_tf_init(dev, &tf);
1721

1722 1723
	switch (class) {
	case ATA_DEV_ATA:
1724
		tf.command = ATA_CMD_ID_ATA;
1725 1726
		break;
	case ATA_DEV_ATAPI:
1727
		tf.command = ATA_CMD_ID_ATAPI;
1728 1729 1730 1731 1732
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1733 1734
	}

1735
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745

	/* Some devices choke if TF registers contain garbage.  Make
	 * sure those are properly initialized.
	 */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1746

T
Tejun Heo 已提交
1747
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1748
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1749
	if (err_mask) {
1750
		if (err_mask & AC_ERR_NODEV_HINT) {
1751
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1752
				ap->print_id, dev->devno);
1753 1754 1755
			return -ENOENT;
		}

1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770
		/* Device or controller might have reported the wrong
		 * device class.  Give a shot at the other IDENTIFY if
		 * the current one is aborted by the device.
		 */
		if (may_fallback &&
		    (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			may_fallback = 0;

			if (class == ATA_DEV_ATA)
				class = ATA_DEV_ATAPI;
			else
				class = ATA_DEV_ATA;
			goto retry;
		}

1771 1772
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1773 1774 1775
		goto err_out;
	}

1776 1777 1778 1779 1780
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1781
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1782

1783
	/* sanity check */
1784
	rc = -EINVAL;
A
Alan Cox 已提交
1785
	reason = "device reports invalid type";
1786 1787 1788 1789 1790 1791 1792

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1793 1794
	}

1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
		tried_spinup = 1;
		/*
		 * Drive powered-up in standby mode, and requires a specific
		 * SET_FEATURES spin-up subcommand before it will accept
		 * anything other than the original IDENTIFY command.
		 */
		ata_tf_init(dev, &tf);
		tf.command = ATA_CMD_SET_FEATURES;
		tf.feature = SETFEATURES_SPINUP;
		tf.protocol = ATA_PROT_NODATA;
		tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1807 1808
		err_mask = ata_exec_internal(dev, &tf, NULL,
					     DMA_NONE, NULL, 0, 0);
1809
		if (err_mask && id[2] != 0x738c) {
1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821
			rc = -EIO;
			reason = "SPINUP failed";
			goto err_out;
		}
		/*
		 * If the drive initially returned incomplete IDENTIFY info,
		 * we now must reissue the IDENTIFY command.
		 */
		if (id[2] == 0x37c8)
			goto retry;
	}

1822
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1823 1824 1825
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
1826 1827
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1828 1829
		 * anything else..
		 * Some drives were very specific about that exact sequence.
1830 1831 1832
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
1833 1834
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1835
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1836 1837 1838 1839 1840 1841 1842 1843 1844
			if (err_mask) {
				rc = -EIO;
				reason = "INIT_DEV_PARAMS failed";
				goto err_out;
			}

			/* current CHS translation info (id[53-58]) might be
			 * changed. reread the identify device info.
			 */
1845
			flags &= ~ATA_READID_POSTRESET;
1846 1847 1848 1849 1850
			goto retry;
		}
	}

	*p_class = class;
1851

1852 1853 1854
	return 0;

 err_out:
T
Tejun Heo 已提交
1855
	if (ata_msg_warn(ap))
1856
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1857
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1858 1859 1860
	return rc;
}

T
Tejun Heo 已提交
1861
static inline u8 ata_dev_knobble(struct ata_device *dev)
1862
{
T
Tejun Heo 已提交
1863 1864
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1865 1866
}

1867 1868 1869
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
1870
	struct ata_port *ap = dev->link->ap;
1871 1872 1873 1874 1875 1876
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
T
Tejun Heo 已提交
1877
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
1878 1879 1880
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1881
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1882
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1883 1884 1885 1886 1887 1888 1889 1890 1891
		dev->flags |= ATA_DFLAG_NCQ;
	}

	if (hdepth >= ddepth)
		snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
	else
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
}

1892
/**
1893 1894 1895 1896 1897
 *	ata_dev_configure - Configure the specified ATA/ATAPI device
 *	@dev: Target device to configure
 *
 *	Configure @dev according to @dev->id.  Generic and low-level
 *	driver specific fixups are also applied.
1898 1899
 *
 *	LOCKING:
1900 1901 1902 1903
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1904
 */
1905
int ata_dev_configure(struct ata_device *dev)
1906
{
T
Tejun Heo 已提交
1907 1908
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
1909
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1910
	const u16 *id = dev->id;
1911
	unsigned int xfer_mask;
1912
	char revbuf[7];		/* XYZ-99\0 */
1913 1914
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1915
	int rc;
1916

1917
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1918 1919
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1920
		return 0;
1921 1922
	}

1923
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1924
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1925

T
Tejun Heo 已提交
1926 1927 1928
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
1929 1930 1931 1932
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1933

T
Tejun Heo 已提交
1934 1935 1936 1937 1938
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

1939
	/* print device capabilities */
1940
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1941 1942 1943
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
1944
			       __FUNCTION__,
1945 1946
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1947

1948
	/* initialize to-be-configured parameters */
1949
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1950 1951 1952 1953 1954 1955 1956
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
1957 1958 1959 1960
	/*
	 * common ATA, ATAPI feature tests
	 */

1961
	/* find max transfer mode; for printk only */
1962
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1963

1964 1965
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1966

1967 1968 1969 1970 1971 1972 1973
	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
			sizeof(fwrevbuf));

	ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
			sizeof(modelbuf));

L
Linus Torvalds 已提交
1974 1975
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1976 1977
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1978 1979 1980
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1981 1982 1983 1984 1985
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1986
		dev->n_sectors = ata_id_n_sectors(id);
1987

1988 1989 1990
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1991
		if (ata_id_has_lba(id)) {
1992
			const char *lba_desc;
1993
			char ncq_desc[20];
1994

1995 1996
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1997
			if (ata_id_has_lba48(id)) {
1998
				dev->flags |= ATA_DFLAG_LBA48;
1999
				lba_desc = "LBA48";
2000 2001 2002 2003

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2004
			}
2005

2006 2007 2008
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2009
			/* print device info to dmesg */
2010 2011 2012 2013 2014 2015 2016
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
2017
					(unsigned long long)dev->n_sectors,
2018 2019
					dev->multi_count, lba_desc, ncq_desc);
			}
2020
		} else {
2021 2022 2023
			/* CHS */

			/* Default translation */
2024 2025 2026
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2027

2028
			if (ata_id_current_chs_valid(id)) {
2029
				/* Current CHS translation is valid. */
2030 2031 2032
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2033 2034 2035
			}

			/* print device info to dmesg */
2036
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2037
				ata_dev_printk(dev, KERN_INFO,
2038 2039 2040
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2041
				ata_dev_printk(dev, KERN_INFO,
2042 2043 2044 2045 2046
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2047 2048
		}

2049
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2050 2051 2052
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2053
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2054 2055
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2056
		u32 sntf;
2057

2058
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2059
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2060
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2061 2062
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2063
			rc = -EINVAL;
L
Linus Torvalds 已提交
2064 2065
			goto err_out_nosup;
		}
2066
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2067

2068 2069 2070 2071
		/* Enable ATAPI AN if both the host and device have
		 * the support.  If PMP is attached, SNTF is required
		 * to enable ATAPI AN to discern between PHY status
		 * changed notifications and ATAPI ANs.
2072
		 */
2073 2074 2075
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
		    (!ap->nr_pmp_links ||
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2076 2077
			unsigned int err_mask;

2078
			/* issue SET feature command to turn this on */
T
Tejun Heo 已提交
2079 2080
			err_mask = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
			if (err_mask)
2081
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2082 2083 2084
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2085
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2086 2087
				atapi_an_string = ", ATAPI AN";
			}
2088 2089
		}

2090
		if (ata_id_cdb_intr(dev->id)) {
2091
			dev->flags |= ATA_DFLAG_CDB_INTR;
2092 2093
			cdb_intr_string = ", CDB intr";
		}
2094

L
Linus Torvalds 已提交
2095
		/* print device info to dmesg */
2096
		if (ata_msg_drv(ap) && print_info)
2097
			ata_dev_printk(dev, KERN_INFO,
T
Tejun Heo 已提交
2098
				       "ATAPI: %s, %s, max %s%s%s\n",
2099
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2100
				       ata_mode_string(xfer_mask),
T
Tejun Heo 已提交
2101
				       cdb_intr_string, atapi_an_string);
L
Linus Torvalds 已提交
2102 2103
	}

2104 2105 2106 2107 2108
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
		/* Let the user know. We don't want to disallow opens for
		   rescue purposes, or in case the vendor is just a blithering
		   idiot */
                if (print_info) {
			ata_dev_printk(dev, KERN_WARNING,
"Drive reports diagnostics failure. This may indicate a drive\n");
			ata_dev_printk(dev, KERN_WARNING,
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2121
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2122
	if (ata_dev_knobble(dev)) {
2123
		if (ata_msg_drv(ap) && print_info)
2124 2125
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2126
		dev->udma_mask &= ATA_UDMA5;
2127 2128 2129
		dev->max_sectors = ATA_MAX_SECTORS;
	}

T
Tejun Heo 已提交
2130
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2131 2132
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2133

2134
	if (ap->ops->dev_config)
2135
		ap->ops->dev_config(dev);
2136

2137 2138 2139
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2140
	return 0;
L
Linus Torvalds 已提交
2141 2142

err_out_nosup:
2143
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2144 2145
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2146
	return rc;
L
Linus Torvalds 已提交
2147 2148
}

A
Alan Cox 已提交
2149
/**
2150
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2151 2152
 *	@ap: port
 *
2153
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2154 2155 2156 2157 2158 2159 2160 2161 2162
 *	detection.
 */

int ata_cable_40wire(struct ata_port *ap)
{
	return ATA_CBL_PATA40;
}

/**
2163
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2164 2165
 *	@ap: port
 *
2166
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198
 *	detection.
 */

int ata_cable_80wire(struct ata_port *ap)
{
	return ATA_CBL_PATA80;
}

/**
 *	ata_cable_unknown	-	return unknown PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which have no PATA cable detection.
 */

int ata_cable_unknown(struct ata_port *ap)
{
	return ATA_CBL_PATA_UNK;
}

/**
 *	ata_cable_sata	-	return SATA cable type
 *	@ap: port
 *
 *	Helper method for drivers which have SATA cables
 */

int ata_cable_sata(struct ata_port *ap)
{
	return ATA_CBL_SATA;
}

L
Linus Torvalds 已提交
2199 2200 2201 2202
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2203 2204 2205 2206
 *	Master ATA bus probing function.  Initiates a hardware-dependent
 *	bus reset, then attempts to identify any devices found on
 *	the bus.
 *
L
Linus Torvalds 已提交
2207
 *	LOCKING:
J
Jeff Garzik 已提交
2208
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2209 2210
 *
 *	RETURNS:
2211
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2212 2213
 */

2214
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2215
{
2216
	unsigned int classes[ATA_MAX_DEVICES];
2217
	int tries[ATA_MAX_DEVICES];
2218
	int rc;
2219
	struct ata_device *dev;
L
Linus Torvalds 已提交
2220

2221
	ata_port_probe(ap);
2222

2223 2224
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2225 2226

 retry:
2227
	/* reset and determine device classes */
2228
	ap->ops->phy_reset(ap);
2229

2230
	ata_link_for_each_dev(dev, &ap->link) {
2231 2232 2233 2234 2235
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2236

2237
		dev->class = ATA_DEV_UNKNOWN;
2238
	}
L
Linus Torvalds 已提交
2239

2240
	ata_port_probe(ap);
2241

A
Alan Cox 已提交
2242 2243 2244
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

2245 2246
	ata_link_for_each_dev(dev, &ap->link)
		dev->pio_mode = XFER_PIO_0;
A
Alan Cox 已提交
2247

2248 2249 2250 2251
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

2252 2253 2254
	ata_link_for_each_dev(dev, &ap->link) {
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2255

2256
		if (!ata_dev_enabled(dev))
2257 2258
			continue;

2259 2260
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2261 2262
		if (rc)
			goto fail;
2263 2264
	}

A
Alan Cox 已提交
2265 2266 2267 2268
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

A
Alan Cox 已提交
2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279
	/* We may have SATA bridge glue hiding here irrespective of the
	   reported cable types and sensed types */
	ata_link_for_each_dev(dev, &ap->link) {
		if (!ata_dev_enabled(dev))
			continue;
		/* SATA drives indicate we have a bridge. We don't know which
		   end of the link the bridge is which is a problem */
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;
	}

2280 2281 2282
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

2283
	ata_link_for_each_dev(dev, &ap->link) {
2284 2285
		if (!ata_dev_enabled(dev))
			continue;
2286

T
Tejun Heo 已提交
2287
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2288
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2289
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2290 2291
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2292 2293
	}

2294
	/* configure transfer mode */
2295
	rc = ata_set_mode(&ap->link, &dev);
2296
	if (rc)
2297
		goto fail;
L
Linus Torvalds 已提交
2298

2299 2300
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2301
			return 0;
L
Linus Torvalds 已提交
2302

2303 2304
	/* no device present, disable port */
	ata_port_disable(ap);
2305
	return -ENODEV;
2306 2307

 fail:
2308 2309
	tries[dev->devno]--;

2310 2311
	switch (rc) {
	case -EINVAL:
2312
		/* eeek, something went very wrong, give up */
2313 2314
		tries[dev->devno] = 0;
		break;
2315 2316 2317 2318

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2319
	case -EIO:
2320 2321 2322 2323
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2324
			sata_down_spd_limit(&ap->link);
2325 2326
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2327 2328
	}

2329
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2330
		ata_dev_disable(dev);
2331

2332
	goto retry;
L
Linus Torvalds 已提交
2333 2334 2335
}

/**
J
Jeff Garzik 已提交
2336 2337
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2338
 *
J
Jeff Garzik 已提交
2339 2340 2341
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2342
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2343
 *	serialization.
L
Linus Torvalds 已提交
2344 2345 2346 2347
 */

void ata_port_probe(struct ata_port *ap)
{
2348
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2349 2350
}

2351 2352
/**
 *	sata_print_link_status - Print SATA link status
2353
 *	@link: SATA link to printk link status about
2354 2355 2356 2357 2358 2359
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2360
void sata_print_link_status(struct ata_link *link)
2361
{
2362
	u32 sstatus, scontrol, tmp;
2363

2364
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2365
		return;
2366
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2367

2368
	if (ata_link_online(link)) {
2369
		tmp = (sstatus >> 4) & 0xf;
2370
		ata_link_printk(link, KERN_INFO,
2371 2372
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2373
	} else {
2374
		ata_link_printk(link, KERN_INFO,
2375 2376
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2377 2378 2379
	}
}

L
Linus Torvalds 已提交
2380
/**
J
Jeff Garzik 已提交
2381 2382
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2383
 *
J
Jeff Garzik 已提交
2384 2385 2386
 *	This function issues commands to standard SATA Sxxx
 *	PHY registers, to wake up the phy (and device), and
 *	clear any reset condition.
L
Linus Torvalds 已提交
2387 2388
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2389
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2390 2391 2392 2393
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
2394
	struct ata_link *link = &ap->link;
L
Linus Torvalds 已提交
2395
	unsigned long timeout = jiffies + (HZ * 5);
2396
	u32 sstatus;
L
Linus Torvalds 已提交
2397 2398

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2399
		/* issue phy wake/reset */
2400
		sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2401 2402 2403
		/* Couldn't find anything in SATA I/II specs, but
		 * AHCI-1.1 10.4.2 says at least 1 ms. */
		mdelay(1);
L
Linus Torvalds 已提交
2404
	}
2405
	/* phy wake/clear reset */
2406
	sata_scr_write_flush(link, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2407 2408 2409 2410

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2411
		sata_scr_read(link, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2412 2413 2414 2415
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2416
	/* print link status */
2417
	sata_print_link_status(link);
2418

2419
	/* TODO: phy layer with polling, timeouts, etc. */
2420
	if (!ata_link_offline(link))
L
Linus Torvalds 已提交
2421
		ata_port_probe(ap);
2422
	else
L
Linus Torvalds 已提交
2423 2424
		ata_port_disable(ap);

2425
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
		return;

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
		ata_port_disable(ap);
		return;
	}

	ap->cbl = ATA_CBL_SATA;
}

/**
J
Jeff Garzik 已提交
2437 2438
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2439
 *
J
Jeff Garzik 已提交
2440 2441
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2442 2443
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2444
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2445 2446 2447 2448 2449
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2450
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2451 2452 2453 2454
		return;
	ata_bus_reset(ap);
}

2455 2456 2457 2458 2459 2460 2461
/**
 *	ata_dev_pair		-	return other device on cable
 *	@adev: device
 *
 *	Obtain the other device on the same cable, or if none is
 *	present NULL is returned
 */
2462

T
Tejun Heo 已提交
2463
struct ata_device *ata_dev_pair(struct ata_device *adev)
2464
{
T
Tejun Heo 已提交
2465 2466
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2467
	if (!ata_dev_enabled(pair))
2468 2469 2470 2471
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2472
/**
J
Jeff Garzik 已提交
2473 2474
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2475
 *
J
Jeff Garzik 已提交
2476 2477 2478 2479 2480
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is disabled, and should
 *	never attempt to probe or communicate with devices
 *	on this port.
 *
J
Jeff Garzik 已提交
2481
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2482
 *	serialization.
L
Linus Torvalds 已提交
2483 2484 2485 2486
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2487 2488
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2489
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2490 2491
}

2492
/**
2493
 *	sata_down_spd_limit - adjust SATA spd limit downward
2494
 *	@link: Link to adjust SATA spd limit for
2495
 *
2496
 *	Adjust SATA spd limit of @link downward.  Note that this
2497
 *	function only adjusts the limit.  The change must be applied
2498
 *	using sata_set_spd().
2499 2500 2501 2502 2503 2504 2505
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2506
int sata_down_spd_limit(struct ata_link *link)
2507
{
2508 2509
	u32 sstatus, spd, mask;
	int rc, highbit;
2510

2511
	if (!sata_scr_valid(link))
2512 2513 2514
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2515
	 * If not, use cached value in link->sata_spd.
2516
	 */
2517
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2518 2519 2520
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2521
		spd = link->sata_spd;
2522

2523
	mask = link->sata_spd_limit;
2524 2525
	if (mask <= 1)
		return -EINVAL;
2526 2527

	/* unconditionally mask off the highest bit */
2528 2529 2530
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2531 2532 2533 2534 2535 2536 2537 2538 2539
	/* Mask off all speeds higher than or equal to the current
	 * one.  Force 1.5Gbps if current SPD is not available.
	 */
	if (spd > 1)
		mask &= (1 << (spd - 1)) - 1;
	else
		mask &= 1;

	/* were we already at the bottom? */
2540 2541 2542
	if (!mask)
		return -EINVAL;

2543
	link->sata_spd_limit = mask;
2544

2545
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2546
			sata_spd_string(fls(mask)));
2547 2548 2549 2550

	return 0;
}

2551
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2552 2553 2554
{
	u32 spd, limit;

2555
	if (link->sata_spd_limit == UINT_MAX)
2556 2557
		limit = 0;
	else
2558
		limit = fls(link->sata_spd_limit);
2559 2560 2561 2562 2563 2564 2565 2566

	spd = (*scontrol >> 4) & 0xf;
	*scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);

	return spd != limit;
}

/**
2567
 *	sata_set_spd_needed - is SATA spd configuration needed
2568
 *	@link: Link in question
2569 2570
 *
 *	Test whether the spd limit in SControl matches
2571
 *	@link->sata_spd_limit.  This function is used to determine
2572 2573 2574 2575 2576 2577 2578 2579 2580
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2581
int sata_set_spd_needed(struct ata_link *link)
2582 2583 2584
{
	u32 scontrol;

2585
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2586 2587
		return 0;

2588
	return __sata_set_spd_needed(link, &scontrol);
2589 2590 2591
}

/**
2592
 *	sata_set_spd - set SATA spd according to spd limit
2593
 *	@link: Link to set SATA spd for
2594
 *
2595
 *	Set SATA spd of @link according to sata_spd_limit.
2596 2597 2598 2599 2600 2601
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2602
 *	changed.  Negative errno if SCR registers are inaccessible.
2603
 */
2604
int sata_set_spd(struct ata_link *link)
2605 2606
{
	u32 scontrol;
2607
	int rc;
2608

2609
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2610
		return rc;
2611

2612
	if (!__sata_set_spd_needed(link, &scontrol))
2613 2614
		return 0;

2615
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2616 2617
		return rc;

2618 2619 2620
	return 1;
}

A
Alan Cox 已提交
2621 2622 2623 2624 2625
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2626
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2627
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2628 2629 2630
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
A
Alan Cox 已提交
2631 2632 2633 2634 2635 2636 2637 2638 2639
 */

static const struct ata_timing ata_timing[] = {

	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },

2640 2641
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
A
Alan Cox 已提交
2642 2643 2644 2645 2646
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
2647

A
Alan Cox 已提交
2648 2649 2650
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
2651

A
Alan Cox 已提交
2652 2653 2654 2655
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },

2656 2657
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
A
Alan Cox 已提交
2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },

	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },

/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */

	{ 0xFF }
};

#define ENOUGH(v,unit)		(((v)-1)/(unit)+1)
#define EZ(v,unit)		((v)?ENOUGH(v,unit):0)

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
	q->setup   = EZ(t->setup   * 1000,  T);
	q->act8b   = EZ(t->act8b   * 1000,  T);
	q->rec8b   = EZ(t->rec8b   * 1000,  T);
	q->cyc8b   = EZ(t->cyc8b   * 1000,  T);
	q->active  = EZ(t->active  * 1000,  T);
	q->recover = EZ(t->recover * 1000,  T);
	q->cycle   = EZ(t->cycle   * 1000,  T);
	q->udma    = EZ(t->udma    * 1000, UT);
}

void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
		      struct ata_timing *m, unsigned int what)
{
	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
{
	const struct ata_timing *t;

	for (t = ata_timing; t->mode != speed; t++)
A
Alan Cox 已提交
2703
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2704
			return NULL;
2705
	return t;
A
Alan Cox 已提交
2706 2707 2708 2709 2710 2711 2712 2713 2714
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
	const struct ata_timing *s;
	struct ata_timing p;

	/*
2715
	 * Find the mode.
2716
	 */
A
Alan Cox 已提交
2717 2718 2719 2720

	if (!(s = ata_timing_find_mode(speed)))
		return -EINVAL;

2721 2722
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
		memset(&p, 0, sizeof(p));
		if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
		} else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
		}
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

	/*
	 * Convert the timing to bus clock counts.
	 */

2743
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2744 2745

	/*
2746 2747 2748
	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
	 * S.M.A.R.T * and some other commands. We have to ensure that the
	 * DMA cycle timing is slower/equal than the fastest PIO timing.
A
Alan Cox 已提交
2749 2750
	 */

2751
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2752 2753 2754 2755 2756
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2757
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768
	 */

	if (t->act8b + t->rec8b < t->cyc8b) {
		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
		t->rec8b = t->cyc8b - t->act8b;
	}

	if (t->active + t->recover < t->cycle) {
		t->active += (t->cycle - (t->active + t->recover)) / 2;
		t->recover = t->cycle - t->active;
	}
J
Jeff Garzik 已提交
2769

2770 2771 2772 2773 2774
	/* In a few cases quantisation may produce enough errors to
	   leave t->cycle too low for the sum of active and recovery
	   if so we must correct this */
	if (t->active + t->recover > t->cycle)
		t->cycle = t->active + t->recover;
A
Alan Cox 已提交
2775 2776 2777 2778

	return 0;
}

2779 2780 2781
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2782
 *	@sel: ATA_DNXFER_* selector
2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2794
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2795
{
2796 2797 2798 2799
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2800

2801 2802
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2803

2804 2805 2806 2807
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2808

2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

	case ATA_DNXFER_DMA:
		if (udma_mask) {
			highbit = fls(udma_mask) - 1;
			udma_mask &= ~(1 << highbit);
			if (!udma_mask)
				return -ENOENT;
		} else if (mwdma_mask) {
			highbit = fls(mwdma_mask) - 1;
			mwdma_mask &= ~(1 << highbit);
			if (!mwdma_mask)
				return -ENOENT;
		}
		break;

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

	case ATA_DNXFER_FORCE_PIO0:
		pio_mask &= 1;
	case ATA_DNXFER_FORCE_PIO:
		mwdma_mask = 0;
		udma_mask = 0;
		break;

	default:
		BUG();
	}

	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);

	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
		return -ENOENT;

	if (!quiet) {
		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
			snprintf(buf, sizeof(buf), "%s:%s",
				 ata_mode_string(xfer_mask),
				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
		else
			snprintf(buf, sizeof(buf), "%s",
				 ata_mode_string(xfer_mask));

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
2861 2862 2863 2864 2865 2866 2867

	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
			    &dev->udma_mask);

	return 0;
}

T
Tejun Heo 已提交
2868
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2869
{
T
Tejun Heo 已提交
2870
	struct ata_eh_context *ehc = &dev->link->eh_context;
2871 2872
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2873

2874
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2875 2876 2877
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2878
	err_mask = ata_dev_set_xfermode(dev);
2879 2880 2881
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
        	err_mask &= ~AC_ERR_DEV;
A
Alan Cox 已提交
2882 2883 2884 2885 2886
	/* Some very old devices and some bad newer ones fail any kind of
	   SET_XFERMODE request but support PIO0-2 timings and no IORDY */
	if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
			dev->pio_mode <= XFER_PIO_2)
		err_mask &= ~AC_ERR_DEV;
2887
	if (err_mask) {
2888 2889
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2890 2891
		return -EIO;
	}
L
Linus Torvalds 已提交
2892

2893
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
2894
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
2895
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2896
	if (rc)
2897
		return rc;
2898

2899 2900
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2901

2902 2903
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2904
	return 0;
L
Linus Torvalds 已提交
2905 2906 2907
}

/**
2908
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2909
 *	@link: link on which timings will be programmed
2910
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2911
 *
2912 2913 2914
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
2915
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2916
 *
L
Linus Torvalds 已提交
2917
 *	LOCKING:
J
Jeff Garzik 已提交
2918
 *	PCI/etc. bus probe sem.
2919 2920 2921
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2922
 */
2923

2924
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2925
{
2926
	struct ata_port *ap = link->ap;
2927
	struct ata_device *dev;
2928
	int rc = 0, used_dma = 0, found = 0;
2929

2930
	/* step 1: calculate xfer_mask */
2931
	ata_link_for_each_dev(dev, link) {
2932
		unsigned int pio_mask, dma_mask;
2933
		unsigned int mode_mask;
2934

2935
		if (!ata_dev_enabled(dev))
2936 2937
			continue;

2938 2939 2940 2941 2942 2943
		mode_mask = ATA_DMA_MASK_ATA;
		if (dev->class == ATA_DEV_ATAPI)
			mode_mask = ATA_DMA_MASK_ATAPI;
		else if (ata_id_is_cfa(dev->id))
			mode_mask = ATA_DMA_MASK_CFA;

T
Tejun Heo 已提交
2944
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2945

2946 2947
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2948 2949 2950 2951 2952 2953

		if (libata_dma_mask & mode_mask)
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
		else
			dma_mask = 0;

2954 2955
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2956

2957
		found = 1;
2958 2959
		if (dev->dma_mode)
			used_dma = 1;
2960
	}
2961
	if (!found)
2962
		goto out;
2963 2964

	/* step 2: always set host PIO timings */
2965
	ata_link_for_each_dev(dev, link) {
2966 2967 2968 2969
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2970
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2971
			rc = -EINVAL;
2972
			goto out;
2973 2974 2975 2976 2977 2978 2979
		}

		dev->xfer_mode = dev->pio_mode;
		dev->xfer_shift = ATA_SHIFT_PIO;
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}
L
Linus Torvalds 已提交
2980

2981
	/* step 3: set host DMA timings */
2982
	ata_link_for_each_dev(dev, link) {
2983 2984 2985 2986 2987 2988 2989 2990
		if (!ata_dev_enabled(dev) || !dev->dma_mode)
			continue;

		dev->xfer_mode = dev->dma_mode;
		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
		if (ap->ops->set_dmamode)
			ap->ops->set_dmamode(ap, dev);
	}
L
Linus Torvalds 已提交
2991 2992

	/* step 4: update devices' xfer mode */
2993
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
2994
		/* don't update suspended devices' xfer mode */
2995
		if (!ata_dev_enabled(dev))
2996 2997
			continue;

T
Tejun Heo 已提交
2998
		rc = ata_dev_set_mode(dev);
2999
		if (rc)
3000
			goto out;
3001
	}
L
Linus Torvalds 已提交
3002

3003 3004
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3005
	 */
J
Jeff Garzik 已提交
3006
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3007
		ap->host->simplex_claimed = ap;
3008

3009 3010 3011 3012
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3013 3014
}

3015 3016
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
3017
 *	@link: link on which timings will be programmed
3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
 *	@r_failed_dev: out paramter for failed device
 *
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
3030
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3031
{
3032 3033
	struct ata_port *ap = link->ap;

3034 3035
	/* has private set_mode? */
	if (ap->ops->set_mode)
3036 3037
		return ap->ops->set_mode(link, r_failed_dev);
	return ata_do_set_mode(link, r_failed_dev);
3038 3039
}

3040 3041 3042 3043 3044 3045 3046 3047 3048 3049
/**
 *	ata_tf_to_host - issue ATA taskfile to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues ATA taskfile register set to ATA host controller,
 *	with proper synchronization with interrupt handler and
 *	other threads.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3050
 *	spin_lock_irqsave(host lock)
3051 3052 3053 3054 3055 3056 3057 3058 3059
 */

static inline void ata_tf_to_host(struct ata_port *ap,
				  const struct ata_taskfile *tf)
{
	ap->ops->tf_load(ap, tf);
	ap->ops->exec_command(ap, tf);
}

L
Linus Torvalds 已提交
3060 3061 3062 3063 3064 3065
/**
 *	ata_busy_sleep - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@tmout_pat: impatience timeout
 *	@tmout: overall timeout
 *
J
Jeff Garzik 已提交
3066 3067 3068
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
3069 3070 3071 3072 3073
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
3074
 */
3075 3076
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
3077 3078 3079 3080 3081 3082 3083
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
3084 3085
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3086 3087 3088 3089
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

3090
	if (status != 0xff && (status & ATA_BUSY))
3091
		ata_port_printk(ap, KERN_WARNING,
3092 3093
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
3094 3095

	timeout = timer_start + tmout;
3096 3097
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3098 3099 3100 3101
		msleep(50);
		status = ata_chk_status(ap);
	}

3102 3103 3104
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
3105
	if (status & ATA_BUSY) {
3106
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
3107 3108
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
3109
		return -EBUSY;
L
Linus Torvalds 已提交
3110 3111 3112 3113 3114
	}

	return 0;
}

3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139
/**
 *	ata_wait_ready - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	Sleep until ATA Status register bit BSY clears, or timeout
 *	occurs.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
{
	unsigned long start = jiffies;
	int warned = 0;

	while (1) {
		u8 status = ata_chk_status(ap);
		unsigned long now = jiffies;

		if (!(status & ATA_BUSY))
			return 0;
3140
		if (!ata_link_online(&ap->link) && status == 0xff)
3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158
			return -ENODEV;
		if (time_after(now, deadline))
			return -EBUSY;

		if (!warned && time_after(now, start + 5 * HZ) &&
		    (deadline - now > 3 * HZ)) {
			ata_port_printk(ap, KERN_WARNING,
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
			warned = 1;
		}

		msleep(50);
	}
}

static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
			      unsigned long deadline)
L
Linus Torvalds 已提交
3159 3160 3161 3162
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3163
	int rc, ret = 0;
L
Linus Torvalds 已提交
3164 3165 3166 3167

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3168 3169
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3170 3171 3172 3173 3174
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3175
	}
L
Linus Torvalds 已提交
3176

3177 3178
	/* if device 1 was found in ata_devchk, wait for register
	 * access briefly, then wait for BSY to clear.
L
Linus Torvalds 已提交
3179
	 */
3180 3181
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3182 3183

		ap->ops->dev_select(ap, 1);
3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198

		/* Wait for register access.  Some ATAPI devices fail
		 * to set nsect/lbal after reset, so don't waste too
		 * much time on it.  We're gonna wait for !BSY anyway.
		 */
		for (i = 0; i < 2; i++) {
			u8 nsect, lbal;

			nsect = ioread8(ioaddr->nsect_addr);
			lbal = ioread8(ioaddr->lbal_addr);
			if ((nsect == 1) && (lbal == 1))
				break;
			msleep(50);	/* give drive a breather */
		}

3199
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3200 3201 3202 3203 3204
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3205
	}
L
Linus Torvalds 已提交
3206 3207 3208 3209 3210 3211 3212

	/* is all this really necessary? */
	ap->ops->dev_select(ap, 0);
	if (dev1)
		ap->ops->dev_select(ap, 1);
	if (dev0)
		ap->ops->dev_select(ap, 0);
3213

T
Tejun Heo 已提交
3214
	return ret;
L
Linus Torvalds 已提交
3215 3216
}

3217 3218
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3219 3220
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
3221 3222
	struct ata_device *dev;
	int i = 0;
L
Linus Torvalds 已提交
3223

T
Tejun Heo 已提交
3224
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3225 3226

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3227 3228 3229 3230 3231
	iowrite8(ap->ctl, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3232

3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251
	/* If we issued an SRST then an ATA drive (not ATAPI)
	 * may have changed configuration and be in PIO0 timing. If
	 * we did a hard reset (or are coming from power on) this is
	 * true for ATA or ATAPI. Until we've set a suitable controller
	 * mode we should not touch the bus as we may be talking too fast.
	 */

	ata_link_for_each_dev(dev, &ap->link)
		dev->pio_mode = XFER_PIO_0;

	/* If the controller has a pio mode setup function then use
	   it to set the chipset to rights. Don't touch the DMA setup
	   as that will be dealt with when revalidating */
	if (ap->ops->set_piomode) {
		ata_link_for_each_dev(dev, &ap->link)
			if (devmask & (1 << i++))
				ap->ops->set_piomode(ap, dev);
	}

L
Linus Torvalds 已提交
3252 3253 3254 3255 3256 3257 3258
	/* spec mandates ">= 2ms" before checking status.
	 * We wait 150ms, because that was the magic delay used for
	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
	 * between when the ATA command register is written, and then
	 * status is checked.  Because waiting for "a while" before
	 * checking status is fine, post SRST, we perform this magic
	 * delay here as well.
3259 3260
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3261 3262 3263
	 */
	msleep(150);

3264
	/* Before we perform post reset processing we want to see if
3265 3266 3267
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3268
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3269
		return -ENODEV;
3270

3271
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286
}

/**
 *	ata_bus_reset - reset host port and associated ATA channel
 *	@ap: port to reset
 *
 *	This is typically the first time we actually start issuing
 *	commands to the ATA channel.  We wait for BSY to clear, then
 *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
 *	result.  Determine what devices, if any, are on the channel
 *	by looking at the device 0/1 error register.  Look at the signature
 *	stored in each device's taskfile registers, to determine if
 *	the device is ATA or ATAPI.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3287
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3288
 *	Obtains host lock.
L
Linus Torvalds 已提交
3289 3290
 *
 *	SIDE EFFECTS:
3291
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3292 3293 3294 3295
 */

void ata_bus_reset(struct ata_port *ap)
{
T
Tejun Heo 已提交
3296
	struct ata_device *device = ap->link.device;
L
Linus Torvalds 已提交
3297 3298 3299
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3300
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3301
	int rc;
L
Linus Torvalds 已提交
3302

T
Tejun Heo 已提交
3303
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322

	/* determine if device 0/1 are present */
	if (ap->flags & ATA_FLAG_SATA_RESET)
		dev0 = 1;
	else {
		dev0 = ata_devchk(ap, 0);
		if (slave_possible)
			dev1 = ata_devchk(ap, 1);
	}

	if (dev0)
		devmask |= (1 << 0);
	if (dev1)
		devmask |= (1 << 1);

	/* select device 0 again */
	ap->ops->dev_select(ap, 0);

	/* issue bus reset */
T
Tejun Heo 已提交
3323 3324 3325
	if (ap->flags & ATA_FLAG_SRST) {
		rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
		if (rc && rc != -ENODEV)
T
Tejun Heo 已提交
3326
			goto err_out;
T
Tejun Heo 已提交
3327
	}
L
Linus Torvalds 已提交
3328 3329 3330 3331

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3332
	device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
L
Linus Torvalds 已提交
3333
	if ((slave_possible) && (err != 0x81))
3334
		device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
L
Linus Torvalds 已提交
3335 3336

	/* is double-select really necessary? */
T
Tejun Heo 已提交
3337
	if (device[1].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3338
		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3339
	if (device[0].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3340 3341 3342
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
T
Tejun Heo 已提交
3343 3344
	if ((device[0].class == ATA_DEV_NONE) &&
	    (device[1].class == ATA_DEV_NONE))
L
Linus Torvalds 已提交
3345 3346 3347 3348
		goto err_out;

	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
		/* set up device control for ATA_FLAG_SATA_RESET */
T
Tejun Heo 已提交
3349
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3350 3351 3352 3353 3354 3355
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3356
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
3357
	ata_port_disable(ap);
L
Linus Torvalds 已提交
3358 3359 3360 3361

	DPRINTK("EXIT\n");
}

3362
/**
3363 3364
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3365
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3366
 *	@deadline: deadline jiffies for the operation
3367
 *
3368
*	Make sure SStatus of @link reaches stable state, determined by
3369 3370
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3371 3372
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3373 3374
 *	until timeout then returns 0 if DET is stable at 1.
 *
3375 3376 3377
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3378 3379 3380 3381 3382 3383
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3384 3385
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3386
{
3387
	unsigned long interval_msec = params[0];
3388 3389
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3390 3391 3392
	u32 last, cur;
	int rc;

3393 3394 3395 3396
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3397
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3398 3399 3400 3401 3402 3403 3404 3405
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3406
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3407 3408 3409 3410 3411
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3412
			if (cur == 1 && time_before(jiffies, deadline))
3413 3414 3415 3416 3417 3418 3419 3420 3421 3422
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

		/* unstable, start over */
		last = cur;
		last_jiffies = jiffies;

3423 3424 3425
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3426
		if (time_after(jiffies, deadline))
3427
			return -EPIPE;
3428 3429 3430 3431
	}
}

/**
3432 3433
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3434
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3435
 *	@deadline: deadline jiffies for the operation
3436
 *
3437
 *	Resume SATA phy @link and debounce it.
3438 3439 3440 3441 3442 3443 3444
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3445 3446
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3447 3448
{
	u32 scontrol;
3449 3450
	int rc;

3451
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3452
		return rc;
3453

3454
	scontrol = (scontrol & 0x0f0) | 0x300;
3455

3456
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3457
		return rc;
3458

3459 3460 3461 3462
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3463

3464
	return sata_link_debounce(link, params, deadline);
3465 3466
}

3467 3468
/**
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3469
 *	@link: ATA link to be reset
3470
 *	@deadline: deadline jiffies for the operation
3471
 *
T
Tejun Heo 已提交
3472
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3473 3474 3475 3476
 *	prereset makes libata abort whole reset sequence and give up
 *	that port, so prereset should be best-effort.  It does its
 *	best to prepare for reset sequence but if things go wrong, it
 *	should just whine, not fail.
3477 3478 3479 3480 3481 3482 3483
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3484
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3485
{
T
Tejun Heo 已提交
3486
	struct ata_port *ap = link->ap;
3487
	struct ata_eh_context *ehc = &link->eh_context;
3488
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3489 3490
	int rc;

T
Tejun Heo 已提交
3491
	/* handle link resume */
3492
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3493
	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3494 3495
		ehc->i.action |= ATA_EH_HARDRESET;

3496 3497 3498 3499 3500 3501
	/* Some PMPs don't work with only SRST, force hardreset if PMP
	 * is supported.
	 */
	if (ap->flags & ATA_FLAG_PMP)
		ehc->i.action |= ATA_EH_HARDRESET;

3502 3503 3504 3505
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3506
	/* if SATA, resume link */
3507
	if (ap->flags & ATA_FLAG_SATA) {
3508
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3509 3510
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3511
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3512 3513 3514 3515 3516 3517
					"link for reset (errno=%d)\n", rc);
	}

	/* Wait for !BSY if the controller can wait for the first D2H
	 * Reg FIS and we don't know that no device is attached.
	 */
3518
	if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
T
Tejun Heo 已提交
3519
		rc = ata_wait_ready(ap, deadline);
3520
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3521
			ata_link_printk(link, KERN_WARNING, "device not ready "
T
Tejun Heo 已提交
3522 3523 3524 3525
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3526 3527 3528 3529

	return 0;
}

3530 3531
/**
 *	ata_std_softreset - reset host port via ATA SRST
T
Tejun Heo 已提交
3532
 *	@link: ATA link to reset
3533
 *	@classes: resulting classes of attached devices
3534
 *	@deadline: deadline jiffies for the operation
3535
 *
3536
 *	Reset host port using ATA SRST.
3537 3538 3539 3540 3541 3542 3543
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3544
int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3545
		      unsigned long deadline)
3546
{
T
Tejun Heo 已提交
3547
	struct ata_port *ap = link->ap;
3548
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3549 3550
	unsigned int devmask = 0;
	int rc;
3551 3552 3553 3554
	u8 err;

	DPRINTK("ENTER\n");

3555
	if (ata_link_offline(link)) {
3556 3557 3558 3559
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570
	/* determine if device 0/1 are present */
	if (ata_devchk(ap, 0))
		devmask |= (1 << 0);
	if (slave_possible && ata_devchk(ap, 1))
		devmask |= (1 << 1);

	/* select device 0 again */
	ap->ops->dev_select(ap, 0);

	/* issue bus reset */
	DPRINTK("about to softreset, devmask=%x\n", devmask);
3571
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3572
	/* if link is occupied, -ENODEV too is an error */
3573
	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
T
Tejun Heo 已提交
3574
		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3575
		return rc;
3576 3577 3578
	}

	/* determine by signature whether we have ATA or ATAPI devices */
3579 3580
	classes[0] = ata_dev_try_classify(&link->device[0],
					  devmask & (1 << 0), &err);
3581
	if (slave_possible && err != 0x81)
3582 3583
		classes[1] = ata_dev_try_classify(&link->device[1],
						  devmask & (1 << 1), &err);
3584

3585
 out:
3586 3587 3588 3589 3590
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
T
Tejun Heo 已提交
3591 3592
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
3593
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3594
 *	@deadline: deadline jiffies for the operation
3595
 *
T
Tejun Heo 已提交
3596
 *	SATA phy-reset @link using DET bits of SControl register.
3597 3598 3599 3600 3601 3602 3603
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3604
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3605
			unsigned long deadline)
3606
{
3607
	u32 scontrol;
3608
	int rc;
3609

3610 3611
	DPRINTK("ENTER\n");

3612
	if (sata_set_spd_needed(link)) {
3613 3614 3615 3616 3617
		/* SATA spec says nothing about how to reconfigure
		 * spd.  To be on the safe side, turn off phy during
		 * reconfiguration.  This works for at least ICH7 AHCI
		 * and Sil3124.
		 */
3618
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3619
			goto out;
3620

3621
		scontrol = (scontrol & 0x0f0) | 0x304;
3622

3623
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3624
			goto out;
3625

3626
		sata_set_spd(link);
3627 3628 3629
	}

	/* issue phy wake/reset */
3630
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3631
		goto out;
3632

3633
	scontrol = (scontrol & 0x0f0) | 0x301;
3634

3635
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3636
		goto out;
3637

3638
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3639 3640 3641 3642
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3643 3644
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3645 3646 3647 3648 3649 3650 3651
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
T
Tejun Heo 已提交
3652
 *	@link: link to reset
3653
 *	@class: resulting class of attached device
3654
 *	@deadline: deadline jiffies for the operation
3655 3656 3657 3658 3659 3660 3661 3662 3663 3664
 *
 *	SATA phy-reset host port using DET bits of SControl register,
 *	wait for !BSY and classify the attached device.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3665
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3666
		       unsigned long deadline)
3667
{
T
Tejun Heo 已提交
3668
	struct ata_port *ap = link->ap;
3669
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3670 3671 3672 3673 3674
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
T
Tejun Heo 已提交
3675
	rc = sata_link_hardreset(link, timing, deadline);
3676
	if (rc) {
T
Tejun Heo 已提交
3677
		ata_link_printk(link, KERN_ERR,
3678 3679 3680
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3681 3682

	/* TODO: phy layer with polling, timeouts, etc. */
3683
	if (ata_link_offline(link)) {
3684 3685 3686 3687 3688
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3689 3690 3691
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3692 3693 3694 3695 3696 3697 3698 3699 3700 3701
	/* If PMP is supported, we have to do follow-up SRST.  Note
	 * that some PMPs don't send D2H Reg FIS after hardreset at
	 * all if the first port is empty.  Wait for it just for a
	 * second and request follow-up SRST.
	 */
	if (ap->flags & ATA_FLAG_PMP) {
		ata_wait_ready(ap, jiffies + HZ);
		return -EAGAIN;
	}

3702
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3703 3704
	/* link occupied, -ENODEV too is an error */
	if (rc) {
T
Tejun Heo 已提交
3705
		ata_link_printk(link, KERN_ERR,
3706 3707
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3708 3709
	}

3710 3711
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3712
	*class = ata_dev_try_classify(link->device, 1, NULL);
3713 3714 3715 3716 3717 3718 3719

	DPRINTK("EXIT, class=%u\n", *class);
	return 0;
}

/**
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3720
 *	@link: the target ata_link
3721 3722 3723 3724 3725 3726 3727 3728 3729
 *	@classes: classes of attached devices
 *
 *	This function is invoked after a successful reset.  Note that
 *	the device might have been reset more than once using
 *	different reset methods before postreset is invoked.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
T
Tejun Heo 已提交
3730
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3731
{
T
Tejun Heo 已提交
3732
	struct ata_port *ap = link->ap;
3733 3734
	u32 serror;

3735 3736 3737
	DPRINTK("ENTER\n");

	/* print link status */
3738
	sata_print_link_status(link);
3739

3740
	/* clear SError */
3741 3742
	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
		sata_scr_write(link, SCR_ERROR, serror);
3743

3744 3745 3746 3747 3748 3749
	/* is double-select really necessary? */
	if (classes[0] != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 1);
	if (classes[1] != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 0);

3750 3751 3752 3753 3754 3755 3756
	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		DPRINTK("EXIT, no device\n");
		return;
	}

	/* set up device control */
T
Tejun Heo 已提交
3757 3758
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3759 3760 3761 3762

	DPRINTK("EXIT\n");
}

3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778
/**
 *	ata_dev_same_device - Determine whether new ID matches configured device
 *	@dev: device to compare against
 *	@new_class: class of the new device
 *	@new_id: IDENTIFY page of the new device
 *
 *	Compare @new_class and @new_id against @dev and determine
 *	whether @dev is the device indicated by @new_class and
 *	@new_id.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if @dev matches @new_class and @new_id, 0 otherwise.
 */
T
Tejun Heo 已提交
3779 3780
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3781 3782
{
	const u16 *old_id = dev->id;
3783 3784
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3785 3786

	if (dev->class != new_class) {
3787 3788
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3789 3790 3791
		return 0;
	}

3792 3793 3794 3795
	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3796 3797

	if (strcmp(model[0], model[1])) {
3798 3799
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3800 3801 3802 3803
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3804 3805
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3806 3807 3808 3809 3810 3811 3812
		return 0;
	}

	return 1;
}

/**
3813
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3814
 *	@dev: target ATA device
3815
 *	@readid_flags: read ID flags
3816 3817 3818 3819 3820 3821 3822 3823 3824 3825
 *
 *	Re-read IDENTIFY page and make sure @dev is still attached to
 *	the port.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
3826
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3827
{
3828
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3829
	u16 *id = (void *)dev->link->ap->sector_buf;
3830 3831
	int rc;

3832
	/* read ID data */
3833
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3834
	if (rc)
3835
		return rc;
3836 3837

	/* is the device still there? */
3838 3839
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3840

3841
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3842 3843 3844 3845 3846 3847
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3848
 *	@new_class: new class code
3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859
 *	@readid_flags: read ID flags
 *
 *	Re-read IDENTIFY page, make sure @dev is still attached to the
 *	port and reconfigure it according to the new IDENTIFY page.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
3860 3861
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3862
{
3863
	u64 n_sectors = dev->n_sectors;
3864 3865 3866 3867 3868
	int rc;

	if (!ata_dev_enabled(dev))
		return -ENODEV;

3869 3870 3871 3872 3873 3874 3875 3876 3877
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
	    new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

3878 3879 3880 3881
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3882 3883

	/* configure device according to the new ID */
3884
	rc = ata_dev_configure(dev);
3885 3886 3887 3888
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
3889 3890
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
3891 3892 3893 3894
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
3895 3896 3897 3898

		/* restore original n_sectors */
		dev->n_sectors = n_sectors;

3899 3900 3901 3902 3903
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3904 3905

 fail:
3906
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3907 3908 3909
	return rc;
}

3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },
3947
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3948
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3949 3950
	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
				NULL,		ATA_HORKAGE_NODMA },
3951 3952 3953
	/* Odd clown on sil3726/4726 PMPs */
	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
						ATA_HORKAGE_SKIP_PM },
3954

3955
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3956
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3957

3958 3959 3960 3961 3962
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3963 3964
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3965
	/* NCQ is broken */
3966
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3967
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
3968 3969
	{ "HITACHI HDS7250SASUN500G*", NULL,    ATA_HORKAGE_NONCQ },
	{ "HITACHI HDS7225SBSUN250G*", NULL,    ATA_HORKAGE_NONCQ },
3970
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
3971

3972 3973 3974 3975 3976
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
3977 3978
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3979
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3980
	{ "HDT722516DLA380",	"V43OA96A",	ATA_HORKAGE_NONCQ, },
3981
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3982
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3983
	{ "WDC WD3200AAJS-00RYA0", "12.01B01",	ATA_HORKAGE_NONCQ, },
3984
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
3985
	{ "ST9120822AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3986
	{ "ST9160821AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3987
	{ "ST9160821AS",	"3.ALD",	ATA_HORKAGE_NONCQ, },
3988
	{ "ST9160821AS",	"3.CCD",	ATA_HORKAGE_NONCQ, },
3989 3990
	{ "ST3160812AS",	"3.ADJ",	ATA_HORKAGE_NONCQ, },
	{ "ST980813AS",		"3.ADB",	ATA_HORKAGE_NONCQ, },
3991
	{ "SAMSUNG HD401LJ",	"ZZ100-15",	ATA_HORKAGE_NONCQ, },
3992

3993 3994 3995 3996 3997
	/* devices which puke on READ_NATIVE_MAX */
	{ "HDS724040KLSA80",	"KFAOA20N",	ATA_HORKAGE_BROKEN_HPA, },
	{ "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
	{ "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
	{ "MAXTOR 6L080L4",	"A93.0500",	ATA_HORKAGE_BROKEN_HPA },
3998

3999 4000 4001 4002
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },

4003 4004
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4005
};
4006

4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017
int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4018
	else {
4019
		len = strlen(name);
4020 4021 4022 4023 4024 4025
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4026 4027 4028 4029

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4030
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4031
{
T
Tejun Heo 已提交
4032 4033
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4034
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4035

T
Tejun Heo 已提交
4036 4037
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
4038

4039
	while (ad->model_num) {
4040
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4041 4042
			if (ad->model_rev == NULL)
				return ad->horkage;
4043
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4044
				return ad->horkage;
4045
		}
4046
		ad++;
4047
	}
L
Linus Torvalds 已提交
4048 4049 4050
	return 0;
}

4051 4052 4053 4054 4055 4056
static int ata_dma_blacklisted(const struct ata_device *dev)
{
	/* We don't support polling DMA.
	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
	 */
T
Tejun Heo 已提交
4057
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4058 4059
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4060
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4061 4062
}

4063 4064 4065 4066
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4067 4068 4069 4070
 *	Compute supported xfermask of @dev and store it in
 *	dev->*_mask.  This function is responsible for applying all
 *	known limits including host controller limits, device
 *	blacklist, etc...
4071 4072 4073 4074
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4075
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4076
{
T
Tejun Heo 已提交
4077 4078
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4079
	struct ata_host *host = ap->host;
4080
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4081

4082
	/* controller modes available */
4083 4084 4085
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4086
	/* drive modes available */
4087 4088 4089
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4090

4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101
	/*
	 *	CFA Advanced TrueIDE timings are not allowed on a shared
	 *	cable
	 */
	if (ata_dev_pair(dev)) {
		/* No PIO5 or PIO6 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
		/* No MWDMA3 or MWDMA 4 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
	}

4102 4103
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4104 4105
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4106
	}
4107

4108 4109
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
4110 4111 4112
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4113
	}
4114

J
Jeff Garzik 已提交
4115 4116 4117
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4118
	if (ap->ops->mode_filter)
4119
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4120

4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4140 4141
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4142 4143 4144 4145 4146 4147
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4148 4149 4150
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4151
 *	LOCKING:
J
Jeff Garzik 已提交
4152
 *	PCI/etc. bus probe sem.
4153 4154 4155
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4156 4157
 */

T
Tejun Heo 已提交
4158
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4159
{
4160
	struct ata_taskfile tf;
4161
	unsigned int err_mask;
L
Linus Torvalds 已提交
4162 4163 4164 4165

	/* set up set-features taskfile */
	DPRINTK("set features - xfer mode\n");

T
Tejun Heo 已提交
4166 4167 4168
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4169
	ata_tf_init(dev, &tf);
4170 4171
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4172
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4173 4174
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
4175

4176
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}

/**
 *	ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
 *	on port @ap with sector count set to indicate Asynchronous
 *	Notification feature
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable)
{
	struct ata_taskfile tf;
	unsigned int err_mask;

	/* set up set-features taskfile */
	DPRINTK("set features - SATA features\n");

	ata_tf_init(dev, &tf);
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = enable;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = SATA_AN;

4212
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4213

4214 4215
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4216 4217
}

4218 4219 4220
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4221 4222
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4223 4224
 *
 *	LOCKING:
4225 4226 4227 4228
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4229
 */
T
Tejun Heo 已提交
4230 4231
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4232
{
4233
	struct ata_taskfile tf;
4234
	unsigned int err_mask;
4235 4236 4237

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4238
		return AC_ERR_INVALID;
4239 4240 4241 4242

	/* set up init dev params taskfile */
	DPRINTK("init dev params \n");

T
Tejun Heo 已提交
4243
	ata_tf_init(dev, &tf);
4244 4245 4246 4247 4248
	tf.command = ATA_CMD_INIT_DEV_PARAMS;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = sectors;
	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4249

4250
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4251 4252 4253 4254 4255
	/* A clean abort indicates an original or just out of spec drive
	   and we should continue as we issue the setup based on the
	   drive reported working geometry */
	if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
		err_mask = 0;
4256

4257 4258
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4259 4260
}

L
Linus Torvalds 已提交
4261
/**
J
Jeff Garzik 已提交
4262 4263 4264 4265
 *	ata_sg_clean - Unmap DMA memory associated with command
 *	@qc: Command containing DMA memory to be released
 *
 *	Unmap all mapped DMA memory associated with this command.
L
Linus Torvalds 已提交
4266 4267
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4268
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4269
 */
4270
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4271 4272
{
	struct ata_port *ap = qc->ap;
4273
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4274
	int dir = qc->dma_dir;
4275
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4276

4277 4278
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4279 4280

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4281
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4282

J
Jeff Garzik 已提交
4283
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4284

4285 4286 4287 4288 4289 4290 4291 4292
	/* if we padded the buffer out to 32-bit bound, and data
	 * xfer direction is from-device, we must copy from the
	 * pad buffer back into the supplied buffer
	 */
	if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
		pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);

	if (qc->flags & ATA_QCFLAG_SG) {
4293
		if (qc->n_elem)
4294
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4295
		/* restore last sg */
J
Jens Axboe 已提交
4296
		sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
4297 4298
		if (pad_buf) {
			struct scatterlist *psg = &qc->pad_sgent;
J
Jens Axboe 已提交
4299
			void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4300
			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4301
			kunmap_atomic(addr, KM_IRQ0);
4302 4303
		}
	} else {
4304
		if (qc->n_elem)
4305
			dma_unmap_single(ap->dev,
4306 4307
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4308 4309 4310 4311 4312 4313
		/* restore sg */
		sg->length += qc->pad_len;
		if (pad_buf)
			memcpy(qc->buf_virt + sg->length - qc->pad_len,
			       pad_buf, qc->pad_len);
	}
L
Linus Torvalds 已提交
4314 4315

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4316
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4317 4318 4319 4320 4321 4322
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4323 4324 4325
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4326
 *	LOCKING:
J
Jeff Garzik 已提交
4327
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4328 4329 4330 4331 4332
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4333 4334
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4335

4336
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4337
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4338 4339

	idx = 0;
4340
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369
		u32 addr, offset;
		u32 sg_len, len;

		/* determine if physical DMA addr spans 64K boundary.
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);

		while (sg_len) {
			offset = addr & 0xffff;
			len = sg_len;
			if ((offset + sg_len) > 0x10000)
				len = 0x10000 - offset;

			ap->prd[idx].addr = cpu_to_le32(addr);
			ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);

			idx++;
			sg_len -= len;
			addr += len;
		}
	}

	if (idx)
		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
}
4370

4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432
/**
 *	ata_fill_sg_dumb - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command. Perform the fill
 *	so that we avoid writing any length 64K records for
 *	controllers that don't follow the spec.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 */
static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct scatterlist *sg;
	unsigned int idx;

	WARN_ON(qc->__sg == NULL);
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);

	idx = 0;
	ata_for_each_sg(sg, qc) {
		u32 addr, offset;
		u32 sg_len, len, blen;

 		/* determine if physical DMA addr spans 64K boundary.
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);

		while (sg_len) {
			offset = addr & 0xffff;
			len = sg_len;
			if ((offset + sg_len) > 0x10000)
				len = 0x10000 - offset;

			blen = len & 0xffff;
			ap->prd[idx].addr = cpu_to_le32(addr);
			if (blen == 0) {
			   /* Some PATA chipsets like the CS5530 can't
			      cope with 0x0000 meaning 64K as the spec says */
				ap->prd[idx].flags_len = cpu_to_le32(0x8000);
				blen = 0x8000;
				ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
			}
			ap->prd[idx].flags_len = cpu_to_le32(blen);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);

			idx++;
			sg_len -= len;
			addr += len;
		}
	}

	if (idx)
		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
}

L
Linus Torvalds 已提交
4433 4434 4435 4436
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4437 4438 4439 4440
 *	Allow low-level driver to filter ATA PACKET commands, returning
 *	a status indicating whether or not it is OK to use DMA for the
 *	supplied PACKET command.
 *
L
Linus Torvalds 已提交
4441
 *	LOCKING:
J
Jeff Garzik 已提交
4442
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4443
 *
L
Linus Torvalds 已提交
4444 4445 4446 4447 4448 4449
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4450 4451 4452 4453 4454 4455

	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
	if (unlikely(qc->nbytes & 15))
		return 1;
4456

L
Linus Torvalds 已提交
4457
	if (ap->ops->check_atapi_dma)
4458
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4459

4460
	return 0;
L
Linus Torvalds 已提交
4461
}
4462

4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492
/**
 *	ata_std_qc_defer - Check whether a qc needs to be deferred
 *	@qc: ATA command in question
 *
 *	Non-NCQ commands cannot run with any other command, NCQ or
 *	not.  As upper layer only knows the queue depth, we are
 *	responsible for maintaining exclusion.  This function checks
 *	whether a new command @qc can be issued.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	ATA_DEFER_* if deferring is needed, 0 otherwise.
 */
int ata_std_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_link *link = qc->dev->link;

	if (qc->tf.protocol == ATA_PROT_NCQ) {
		if (!ata_tag_valid(link->active_tag))
			return 0;
	} else {
		if (!ata_tag_valid(link->active_tag) && !link->sactive)
			return 0;
	}

	return ATA_DEFER_LINK;
}

L
Linus Torvalds 已提交
4493 4494 4495 4496
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4497 4498
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4499
 *	LOCKING:
J
Jeff Garzik 已提交
4500
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4501 4502 4503 4504 4505 4506 4507 4508 4509
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526
/**
 *	ata_dumb_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
 *	Prepare ATA taskfile for submission.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg_dumb(qc);
}

4527 4528
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4529 4530 4531 4532 4533 4534 4535 4536 4537 4538
/**
 *	ata_sg_init_one - Associate command with memory buffer
 *	@qc: Command to be associated
 *	@buf: Memory buffer
 *	@buflen: Length of memory buffer, in bytes.
 *
 *	Initialize the data-related elements of queued_cmd @qc
 *	to point to a single memory buffer, @buf of byte length @buflen.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4539
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4540 4541
 */

L
Linus Torvalds 已提交
4542 4543 4544 4545
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4546
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4547
	qc->n_elem = 1;
4548
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4549
	qc->buf_virt = buf;
4550
	qc->nbytes = buflen;
J
Jens Axboe 已提交
4551
	qc->cursg = qc->__sg;
L
Linus Torvalds 已提交
4552

4553
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4554 4555
}

J
Jeff Garzik 已提交
4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566
/**
 *	ata_sg_init - Associate command with scatter-gather table.
 *	@qc: Command to be associated
 *	@sg: Scatter-gather table.
 *	@n_elem: Number of elements in s/g table.
 *
 *	Initialize the data-related elements of queued_cmd @qc
 *	to point to a scatter-gather table @sg, containing @n_elem
 *	elements.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4567
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4568 4569
 */

L
Linus Torvalds 已提交
4570 4571 4572 4573
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4574
	qc->__sg = sg;
L
Linus Torvalds 已提交
4575
	qc->n_elem = n_elem;
4576
	qc->orig_n_elem = n_elem;
J
Jens Axboe 已提交
4577
	qc->cursg = qc->__sg;
L
Linus Torvalds 已提交
4578 4579 4580
}

/**
J
Jeff Garzik 已提交
4581 4582 4583 4584
 *	ata_sg_setup_one - DMA-map the memory buffer associated with a command.
 *	@qc: Command with memory buffer to be mapped.
 *
 *	DMA-map the memory buffer associated with queued_cmd @qc.
L
Linus Torvalds 已提交
4585 4586
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4587
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4588 4589
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4590
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4591 4592 4593 4594 4595 4596
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4597
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4598
	dma_addr_t dma_address;
4599
	int trim_sg = 0;
L
Linus Torvalds 已提交
4600

4601 4602 4603 4604 4605 4606
	/* we must lengthen transfers to end on a 32-bit boundary */
	qc->pad_len = sg->length & 3;
	if (qc->pad_len) {
		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;

4607
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		if (qc->tf.flags & ATA_TFLAG_WRITE)
			memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
			       qc->pad_len);

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim sg */
		sg->length -= qc->pad_len;
4619 4620
		if (sg->length == 0)
			trim_sg = 1;
4621 4622 4623 4624 4625

		DPRINTK("padding done, sg->length=%u pad_len=%u\n",
			sg->length, qc->pad_len);
	}

4626 4627
	if (trim_sg) {
		qc->n_elem--;
4628 4629 4630
		goto skip_map;
	}

4631
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4632
				     sg->length, dir);
4633 4634 4635
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4636
		return -1;
4637
	}
L
Linus Torvalds 已提交
4638 4639

	sg_dma_address(sg) = dma_address;
4640
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4641

4642
skip_map:
L
Linus Torvalds 已提交
4643 4644 4645 4646 4647 4648 4649
	DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
		qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

	return 0;
}

/**
J
Jeff Garzik 已提交
4650 4651 4652 4653
 *	ata_sg_setup - DMA-map the scatter-gather table associated with a command.
 *	@qc: Command with scatter-gather table to be mapped.
 *
 *	DMA-map the scatter-gather table associated with queued_cmd @qc.
L
Linus Torvalds 已提交
4654 4655
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4656
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4657 4658
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4659
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4660 4661 4662 4663 4664 4665
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4666
	struct scatterlist *sg = qc->__sg;
J
Jens Axboe 已提交
4667
	struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
4668
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4669

T
Tejun Heo 已提交
4670
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4671
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4672

4673 4674 4675 4676 4677 4678 4679
	/* we must lengthen transfers to end on a 32-bit boundary */
	qc->pad_len = lsg->length & 3;
	if (qc->pad_len) {
		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;
		unsigned int offset;

4680
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4681 4682 4683 4684 4685 4686 4687 4688

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		/*
		 * psg->page/offset are used to copy to-be-written
		 * data in this function or read data in ata_sg_clean.
		 */
		offset = lsg->offset + lsg->length - qc->pad_len;
J
Jens Axboe 已提交
4689
		sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT));
4690 4691 4692
		psg->offset = offset_in_page(offset);

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
J
Jens Axboe 已提交
4693
			void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4694
			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4695
			kunmap_atomic(addr, KM_IRQ0);
4696 4697 4698 4699 4700 4701
		}

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim last sg */
		lsg->length -= qc->pad_len;
4702 4703
		if (lsg->length == 0)
			trim_sg = 1;
4704 4705 4706 4707 4708

		DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
			qc->n_elem - 1, lsg->length, qc->pad_len);
	}

4709 4710 4711 4712 4713 4714 4715 4716 4717
	pre_n_elem = qc->n_elem;
	if (trim_sg && pre_n_elem)
		pre_n_elem--;

	if (!pre_n_elem) {
		n_elem = 0;
		goto skip_map;
	}

L
Linus Torvalds 已提交
4718
	dir = qc->dma_dir;
4719
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4720 4721 4722
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4723
		return -1;
4724
	}
L
Linus Torvalds 已提交
4725 4726 4727

	DPRINTK("%d sg elements mapped\n", n_elem);

4728
skip_map:
L
Linus Torvalds 已提交
4729 4730 4731 4732 4733
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4734
/**
4735
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4736 4737 4738 4739 4740 4741 4742 4743
 *	@buf:  Buffer to swap
 *	@buf_words:  Number of 16-bit words in buffer.
 *
 *	Swap halves of 16-bit words if needed to convert from
 *	little-endian byte order to native cpu byte order, or
 *	vice-versa.
 *
 *	LOCKING:
R
Randy Dunlap 已提交
4744
 *	Inherited from caller.
E
Edward Falk 已提交
4745
 */
L
Linus Torvalds 已提交
4746 4747 4748 4749 4750 4751 4752 4753 4754 4755
void swap_buf_le16(u16 *buf, unsigned int buf_words)
{
#ifdef __BIG_ENDIAN
	unsigned int i;

	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
}

A
Albert Lee 已提交
4756
/**
T
Tejun Heo 已提交
4757
 *	ata_data_xfer - Transfer data by PIO
4758
 *	@adev: device to target
A
Albert Lee 已提交
4759 4760
 *	@buf: data buffer
 *	@buflen: buffer length
4761
 *	@write_data: read/write
A
Albert Lee 已提交
4762 4763 4764 4765 4766 4767
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4768 4769
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4770
{
T
Tejun Heo 已提交
4771
	struct ata_port *ap = adev->link->ap;
A
Albert Lee 已提交
4772
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4773

A
Albert Lee 已提交
4774
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4775
	if (write_data)
T
Tejun Heo 已提交
4776
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4777
	else
T
Tejun Heo 已提交
4778
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4779 4780 4781 4782 4783 4784 4785 4786

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
		u16 align_buf[1] = { 0 };
		unsigned char *trailing_buf = buf + buflen - 1;

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
T
Tejun Heo 已提交
4787
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4788
		} else {
T
Tejun Heo 已提交
4789
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4790 4791 4792
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4793 4794
}

4795
/**
T
Tejun Heo 已提交
4796
 *	ata_data_xfer_noirq - Transfer data by PIO
4797 4798 4799 4800 4801
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4802
 *	Transfer data from/to the device data register by PIO. Do the
4803 4804 4805 4806 4807
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4808 4809
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4810 4811 4812
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4813
	ata_data_xfer(adev, buf, buflen, write_data);
4814 4815 4816 4817
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4818
/**
4819
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4820 4821
 *	@qc: Command on going
 *
4822
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4823 4824 4825 4826 4827
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4828 4829 4830 4831 4832 4833 4834 4835
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4836
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4837
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4838

J
Jens Axboe 已提交
4839
	page = sg_page(qc->cursg);
J
Jens Axboe 已提交
4840
	offset = qc->cursg->offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4841 4842 4843 4844 4845 4846 4847

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4848 4849 4850
	if (PageHighMem(page)) {
		unsigned long flags;

4851
		/* FIXME: use a bounce buffer */
4852 4853
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4854

4855
		/* do the actual data transfer */
4856
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4857

4858 4859 4860 4861
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4862
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4863
	}
L
Linus Torvalds 已提交
4864

4865 4866
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4867

J
Jens Axboe 已提交
4868 4869
	if (qc->cursg_ofs == qc->cursg->length) {
		qc->cursg = sg_next(qc->cursg);
L
Linus Torvalds 已提交
4870 4871 4872 4873
		qc->cursg_ofs = 0;
	}
}

4874
/**
4875
 *	ata_pio_sectors - Transfer one or many sectors.
4876 4877
 *	@qc: Command on going
 *
4878
 *	Transfer one or many sectors of data from/to the
4879 4880 4881 4882 4883
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4884

4885 4886 4887 4888 4889 4890
static void ata_pio_sectors(struct ata_queued_cmd *qc)
{
	if (is_multi_taskfile(&qc->tf)) {
		/* READ/WRITE MULTIPLE */
		unsigned int nsect;

J
Jeff Garzik 已提交
4891
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4892

4893
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4894
			    qc->dev->multi_count);
4895 4896 4897 4898
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
4899 4900

	ata_altstatus(qc->ap); /* flush */
4901 4902
}

4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918
/**
 *	atapi_send_cdb - Write CDB bytes to hardware
 *	@ap: Port to which ATAPI device is attached.
 *	@qc: Taskfile currently active
 *
 *	When device has indicated its readiness to accept
 *	a CDB, this function is called.  Send the CDB.
 *
 *	LOCKING:
 *	caller.
 */

static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
{
	/* send SCSI cdb */
	DPRINTK("send cdb\n");
4919
	WARN_ON(qc->dev->cdb_len < 12);
4920

4921
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936
	ata_altstatus(ap); /* flush */

	switch (qc->tf.protocol) {
	case ATA_PROT_ATAPI:
		ap->hsm_task_state = HSM_ST;
		break;
	case ATA_PROT_ATAPI_NODATA:
		ap->hsm_task_state = HSM_ST_LAST;
		break;
	case ATA_PROT_ATAPI_DMA:
		ap->hsm_task_state = HSM_ST_LAST;
		/* initiate bmdma */
		ap->ops->bmdma_start(qc);
		break;
	}
L
Linus Torvalds 已提交
4937 4938
}

A
Albert Lee 已提交
4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950
/**
 *	__atapi_pio_bytes - Transfer data from/to the ATAPI device.
 *	@qc: Command on going
 *	@bytes: number of bytes
 *
 *	Transfer Transfer data from/to the ATAPI device.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 */

L
Linus Torvalds 已提交
4951 4952 4953
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4954
	struct scatterlist *sg = qc->__sg;
F
FUJITA Tomonori 已提交
4955
	struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
L
Linus Torvalds 已提交
4956 4957 4958 4959
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;
F
FUJITA Tomonori 已提交
4960
	int no_more_sg = 0;
L
Linus Torvalds 已提交
4961

4962
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4963
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4964 4965

next_sg:
F
FUJITA Tomonori 已提交
4966
	if (unlikely(no_more_sg)) {
J
Jeff Garzik 已提交
4967
		/*
4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978
		 * The end of qc->sg is reached and the device expects
		 * more data to transfer. In order not to overrun qc->sg
		 * and fulfill length specified in the byte count register,
		 *    - for read case, discard trailing data from the device
		 *    - for write case, padding zero data to the device
		 */
		u16 pad_buf[1] = { 0 };
		unsigned int words = bytes >> 1;
		unsigned int i;

		if (words) /* warning if bytes > 1 */
4979 4980
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4981 4982

		for (i = 0; i < words; i++)
4983
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4984

A
Albert Lee 已提交
4985
		ap->hsm_task_state = HSM_ST_LAST;
4986 4987 4988
		return;
	}

J
Jens Axboe 已提交
4989
	sg = qc->cursg;
L
Linus Torvalds 已提交
4990

J
Jens Axboe 已提交
4991
	page = sg_page(sg);
L
Linus Torvalds 已提交
4992 4993 4994 4995 4996 4997
	offset = sg->offset + qc->cursg_ofs;

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

4998
	/* don't overrun current sg */
4999
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
5000 5001 5002 5003

	/* don't cross page boundaries */
	count = min(count, (unsigned int)PAGE_SIZE - offset);

5004 5005
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

5006 5007 5008
	if (PageHighMem(page)) {
		unsigned long flags;

5009
		/* FIXME: use bounce buffer */
5010 5011
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
5012

5013
		/* do the actual data transfer */
5014
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5015

5016 5017 5018 5019
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
5020
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5021
	}
L
Linus Torvalds 已提交
5022 5023 5024 5025 5026

	bytes -= count;
	qc->curbytes += count;
	qc->cursg_ofs += count;

5027
	if (qc->cursg_ofs == sg->length) {
F
FUJITA Tomonori 已提交
5028 5029 5030
		if (qc->cursg == lsg)
			no_more_sg = 1;

J
Jens Axboe 已提交
5031
		qc->cursg = sg_next(qc->cursg);
L
Linus Torvalds 已提交
5032 5033 5034
		qc->cursg_ofs = 0;
	}

5035
	if (bytes)
L
Linus Torvalds 已提交
5036 5037 5038
		goto next_sg;
}

A
Albert Lee 已提交
5039 5040 5041 5042 5043 5044 5045 5046 5047 5048
/**
 *	atapi_pio_bytes - Transfer data from/to the ATAPI device.
 *	@qc: Command on going
 *
 *	Transfer Transfer data from/to the ATAPI device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
5049 5050 5051 5052 5053 5054 5055
static void atapi_pio_bytes(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *dev = qc->dev;
	unsigned int ireason, bc_lo, bc_hi, bytes;
	int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;

5056 5057 5058 5059 5060 5061 5062 5063 5064 5065
	/* Abuse qc->result_tf for temp storage of intermediate TF
	 * here to save some kernel stack usage.
	 * For normal completion, qc->result_tf is not relevant. For
	 * error, qc->result_tf is later overwritten by ata_qc_complete().
	 * So, the correctness of qc->result_tf is not affected.
	 */
	ap->ops->tf_read(ap, &qc->result_tf);
	ireason = qc->result_tf.nsect;
	bc_lo = qc->result_tf.lbam;
	bc_hi = qc->result_tf.lbah;
L
Linus Torvalds 已提交
5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076
	bytes = (bc_hi << 8) | bc_lo;

	/* shall be cleared to zero, indicating xfer of data */
	if (ireason & (1 << 0))
		goto err_out;

	/* make sure transfer direction matches expected */
	i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
	if (do_write != i_write)
		goto err_out;

T
Tejun Heo 已提交
5077
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5078

L
Linus Torvalds 已提交
5079
	__atapi_pio_bytes(qc, bytes);
5080
	ata_altstatus(ap); /* flush */
L
Linus Torvalds 已提交
5081 5082 5083 5084

	return;

err_out:
5085
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5086
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
5087
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
5088 5089 5090
}

/**
5091 5092 5093
 *	ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
 *	@ap: the target ata_port
 *	@qc: qc on going
L
Linus Torvalds 已提交
5094
 *
5095 5096
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
5097
 */
5098 5099

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5100
{
5101 5102
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
5103

5104 5105 5106 5107
	if (ap->hsm_task_state == HSM_ST_FIRST) {
		if (qc->tf.protocol == ATA_PROT_PIO &&
		    (qc->tf.flags & ATA_TFLAG_WRITE))
		    return 1;
L
Linus Torvalds 已提交
5108

5109 5110 5111
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
5112 5113
	}

5114 5115
	return 0;
}
L
Linus Torvalds 已提交
5116

T
Tejun Heo 已提交
5117 5118 5119 5120 5121 5122 5123 5124
/**
 *	ata_hsm_qc_complete - finish a qc running on standard HSM
 *	@qc: Command to complete
 *	@in_wq: 1 if called from workqueue, 0 otherwise
 *
 *	Finish @qc which is running on standard HSM.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5125
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
5126 5127 5128 5129 5130 5131 5132 5133 5134
 *	Otherwise, none on entry and grabs host lock.
 */
static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
{
	struct ata_port *ap = qc->ap;
	unsigned long flags;

	if (ap->ops->error_handler) {
		if (in_wq) {
5135
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
5136

J
Jeff Garzik 已提交
5137 5138
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
5139 5140 5141 5142
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5143
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5144 5145 5146 5147 5148
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

5149
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5150 5151 5152 5153 5154 5155 5156 5157
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
5158
			spin_lock_irqsave(ap->lock, flags);
5159
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5160
			ata_qc_complete(qc);
5161
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5162 5163 5164 5165 5166
		} else
			ata_qc_complete(qc);
	}
}

5167 5168 5169 5170 5171 5172 5173 5174 5175 5176
/**
 *	ata_hsm_move - move the HSM to the next state.
 *	@ap: the target ata_port
 *	@qc: qc on going
 *	@status: current device status
 *	@in_wq: 1 if called from workqueue, 0 otherwise
 *
 *	RETURNS:
 *	1 when poll next status needed, 0 otherwise.
 */
5177 5178
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
5179
{
5180 5181 5182
	unsigned long flags = 0;
	int poll_next;

5183 5184
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

5185 5186 5187 5188
	/* Make sure ata_qc_issue_prot() does not throw things
	 * like DMA polling into the workqueue. Notice that
	 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
	 */
5189
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5190

5191
fsm_start:
5192
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
5193
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5194

5195 5196
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5197 5198 5199 5200 5201 5202 5203 5204
		/* Send first data block or PACKET CDB */

		/* If polling, we will stay in the work queue after
		 * sending the data. Otherwise, interrupt handler
		 * takes over after sending the data.
		 */
		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);

5205
		/* check device status */
5206 5207 5208 5209 5210 5211 5212 5213 5214
		if (unlikely((status & ATA_DRQ) == 0)) {
			/* handle BSY=0, DRQ=0 as error */
			if (likely(status & (ATA_ERR | ATA_DF)))
				/* device stops HSM for abort/error */
				qc->err_mask |= AC_ERR_DEV;
			else
				/* HSM violation. Let EH handle this */
				qc->err_mask |= AC_ERR_HSM;

A
Albert Lee 已提交
5215
			ap->hsm_task_state = HSM_ST_ERR;
5216
			goto fsm_start;
L
Linus Torvalds 已提交
5217 5218
		}

5219 5220
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
5221 5222 5223
		 * We ignore DRQ here and stop the HSM by
		 * changing hsm_task_state to HSM_ST_ERR and
		 * let the EH abort the command or reset the device.
5224 5225
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5226 5227
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
5228
			qc->err_mask |= AC_ERR_HSM;
5229 5230
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
5231
		}
L
Linus Torvalds 已提交
5232

5233 5234 5235 5236 5237 5238
		/* Send the CDB (atapi) or the first data block (ata pio out).
		 * During the state transition, interrupt handler shouldn't
		 * be invoked before the data transfer is complete and
		 * hsm_task_state is changed. Hence, the following locking.
		 */
		if (in_wq)
5239
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
5240

5241 5242 5243 5244
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
5245

5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256
			/* ata_pio_sectors() might change the state
			 * to HSM_ST_LAST. so, the state is changed here
			 * before ata_pio_sectors().
			 */
			ap->hsm_task_state = HSM_ST;
			ata_pio_sectors(qc);
		} else
			/* send CDB */
			atapi_send_cdb(ap, qc);

		if (in_wq)
5257
			spin_unlock_irqrestore(ap->lock, flags);
5258 5259 5260 5261

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
5262
		break;
5263

5264 5265 5266 5267 5268
	case HSM_ST:
		/* complete command or read/write the data register */
		if (qc->tf.protocol == ATA_PROT_ATAPI) {
			/* ATAPI PIO protocol */
			if ((status & ATA_DRQ) == 0) {
5269 5270 5271
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
5272 5273 5274
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5275

5276 5277
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
5278 5279 5280
			 * We ignore DRQ here and stop the HSM by
			 * changing hsm_task_state to HSM_ST_ERR and
			 * let the EH abort the command or reset the device.
5281 5282
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5283 5284 5285
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
5286
				qc->err_mask |= AC_ERR_HSM;
5287 5288
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5289
			}
L
Linus Torvalds 已提交
5290

5291
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
5292

5293 5294 5295
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
5296

5297 5298 5299 5300
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
5301 5302 5303 5304
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
5305 5306 5307 5308 5309 5310
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
5311

5312 5313 5314
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5315

5316 5317 5318 5319 5320 5321 5322 5323 5324
			/* For PIO reads, some devices may ask for
			 * data transfer (DRQ=1) alone with ERR=1.
			 * We respect DRQ here and transfer one
			 * block of junk data before changing the
			 * hsm_task_state to HSM_ST_ERR.
			 *
			 * For PIO writes, ERR=1 DRQ=1 doesn't make
			 * sense since the data block has been
			 * transferred to the device.
5325 5326 5327 5328
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5329 5330 5331 5332 5333 5334

				if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
					ata_pio_sectors(qc);
					status = ata_wait_idle(ap);
				}

5335 5336 5337
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5338 5339 5340 5341 5342 5343
				/* ata_pio_sectors() might change the
				 * state to HSM_ST_LAST. so, the state
				 * is changed after ata_pio_sectors().
				 */
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5344 5345
			}

5346 5347 5348 5349 5350
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
5351
				status = ata_wait_idle(ap);
5352 5353 5354 5355
				goto fsm_start;
			}
		}

5356
		poll_next = 1;
L
Linus Torvalds 已提交
5357 5358
		break;

A
Albert Lee 已提交
5359
	case HSM_ST_LAST:
5360 5361
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5362 5363 5364 5365 5366
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5367
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5368
			ap->print_id, qc->dev->devno, status);
5369

5370 5371
		WARN_ON(qc->err_mask);

5372
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5373

5374
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5375
		ata_hsm_qc_complete(qc, in_wq);
5376 5377

		poll_next = 0;
L
Linus Torvalds 已提交
5378 5379
		break;

A
Albert Lee 已提交
5380
	case HSM_ST_ERR:
5381 5382 5383 5384 5385 5386
		/* make sure qc->err_mask is available to
		 * know what's wrong and recover
		 */
		WARN_ON(qc->err_mask == 0);

		ap->hsm_task_state = HSM_ST_IDLE;
5387

5388
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5389
		ata_hsm_qc_complete(qc, in_wq);
5390 5391

		poll_next = 0;
5392 5393
		break;
	default:
5394
		poll_next = 0;
5395
		BUG();
L
Linus Torvalds 已提交
5396 5397
	}

5398
	return poll_next;
L
Linus Torvalds 已提交
5399 5400
}

5401
static void ata_pio_task(struct work_struct *work)
5402
{
5403 5404 5405
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5406
	u8 status;
5407
	int poll_next;
5408

J
Jeff Garzik 已提交
5409
fsm_start:
5410
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5411

5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423
	/*
	 * This is purely heuristic.  This is a fast path.
	 * Sometimes when we enter, BSY will be cleared in
	 * a chk-status or two.  If not, the drive is probably seeking
	 * or something.  Snooze for a couple msecs, then
	 * chk-status again.  If still busy, queue delayed work.
	 */
	status = ata_busy_wait(ap, ATA_BUSY, 5);
	if (status & ATA_BUSY) {
		msleep(2);
		status = ata_busy_wait(ap, ATA_BUSY, 10);
		if (status & ATA_BUSY) {
5424
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5425 5426
			return;
		}
5427 5428
	}

5429 5430
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5431

5432 5433 5434 5435
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5436
		goto fsm_start;
5437 5438
}

L
Linus Torvalds 已提交
5439 5440 5441 5442 5443 5444
/**
 *	ata_qc_new - Request an available ATA command, for queueing
 *	@ap: Port associated with device @dev
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5445
 *	None.
L
Linus Torvalds 已提交
5446 5447 5448 5449 5450 5451 5452
 */

static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
{
	struct ata_queued_cmd *qc = NULL;
	unsigned int i;

5453
	/* no command while frozen */
5454
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5455 5456
		return NULL;

5457 5458
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5459
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5460
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

/**
 *	ata_qc_new_init - Request an available ATA command, and initialize it
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5475
 *	None.
L
Linus Torvalds 已提交
5476 5477
 */

T
Tejun Heo 已提交
5478
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5479
{
T
Tejun Heo 已提交
5480
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
5481 5482 5483 5484 5485 5486 5487 5488
	struct ata_queued_cmd *qc;

	qc = ata_qc_new(ap);
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
5489
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502
	}

	return qc;
}

/**
 *	ata_qc_free - free unused ata_queued_cmd
 *	@qc: Command to complete
 *
 *	Designed to free unused ata_queued_cmd object
 *	in case something prevents using it.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5503
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5504 5505 5506
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5507 5508 5509
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5510
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5511

5512 5513 5514 5515
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5516
		clear_bit(tag, &ap->qc_allocated);
5517
	}
L
Linus Torvalds 已提交
5518 5519
}

5520
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5521
{
5522
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5523
	struct ata_link *link = qc->dev->link;
5524

5525 5526
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5527 5528 5529 5530

	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
		ata_sg_clean(qc);

5531
	/* command should be marked inactive atomically with qc completion */
5532
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5533
		link->sactive &= ~(1 << qc->tag);
5534 5535 5536
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
5537
		link->active_tag = ATA_TAG_POISON;
5538 5539 5540 5541 5542 5543 5544
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
5545

5546 5547 5548 5549 5550
	/* atapi: mark qc as inactive to prevent the interrupt handler
	 * from completing the command twice later, before the error handler
	 * is called. (when rc != 0 and atapi request sense is needed)
	 */
	qc->flags &= ~ATA_QCFLAG_ACTIVE;
5551
	ap->qc_active &= ~(1 << qc->tag);
5552

L
Linus Torvalds 已提交
5553
	/* call completion callback */
5554
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5555 5556
}

5557 5558 5559 5560 5561
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5562
	ap->ops->tf_read(ap, &qc->result_tf);
5563 5564
}

5565 5566 5567 5568 5569 5570 5571 5572 5573
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *	@err_mask: ATA Status register contents
 *
 *	Indicate to the mid and upper layers that an ATA
 *	command has completed, with either an ok or not-ok status.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5574
 *	spin_lock_irqsave(host lock)
5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593
 */
void ata_qc_complete(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	/* XXX: New EH and old EH use different mechanisms to
	 * synchronize EH with regular execution path.
	 *
	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
	 * Normal execution path is responsible for not accessing a
	 * failed qc.  libata core enforces the rule by returning NULL
	 * from ata_qc_from_tag() for failed qcs.
	 *
	 * Old EH depends on ata_qc_complete() nullifying completion
	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
	 * not synchronize with interrupt handler.  Only PIO task is
	 * taken care of.
	 */
	if (ap->ops->error_handler) {
5594
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5595 5596 5597 5598 5599 5600 5601

		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			if (!ata_tag_internal(qc->tag)) {
				/* always fill result TF for failed qc */
5602
				fill_result_tf(qc);
5603 5604 5605 5606 5607 5608 5609
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5610
			fill_result_tf(qc);
5611 5612 5613 5614 5615 5616 5617 5618

		__ata_qc_complete(qc);
	} else {
		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
			return;

		/* read result TF if failed or requested */
		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5619
			fill_result_tf(qc);
5620 5621 5622 5623 5624

		__ata_qc_complete(qc);
	}
}

5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *	@finish_qc: LLDD callback invoked before completing a qc
 *
 *	Complete in-flight commands.  This functions is meant to be
 *	called from low-level driver's interrupt routine to complete
 *	requests normally.  ap->qc_active and @qc_active is compared
 *	and commands are completed accordingly.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5637
 *	spin_lock_irqsave(host lock)
5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
			     void (*finish_qc)(struct ata_queued_cmd *))
{
	int nr_done = 0;
	u32 done_mask;
	int i;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
		ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
				"(%08x->%08x)\n", ap->qc_active, qc_active);
		return -EINVAL;
	}

	for (i = 0; i < ATA_MAX_QUEUE; i++) {
		struct ata_queued_cmd *qc;

		if (!(done_mask & (1 << i)))
			continue;

		if ((qc = ata_qc_from_tag(ap, i))) {
			if (finish_qc)
				finish_qc(qc);
			ata_qc_complete(qc);
			nr_done++;
		}
	}

	return nr_done;
}

L
Linus Torvalds 已提交
5674 5675 5676 5677 5678
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5679
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707
	case ATA_PROT_DMA:
	case ATA_PROT_ATAPI_DMA:
		return 1;

	case ATA_PROT_ATAPI:
	case ATA_PROT_PIO:
		if (ap->flags & ATA_FLAG_PIO_DMA)
			return 1;

		/* fall through */

	default:
		return 0;
	}

	/* never reached */
}

/**
 *	ata_qc_issue - issue taskfile to device
 *	@qc: command to issue to device
 *
 *	Prepare an ATA command to submission to device.
 *	This includes mapping the data into a DMA-able
 *	area, filling in the S/G table, and finally
 *	writing the taskfile to hardware, starting the command.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5708
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5709
 */
5710
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5711 5712
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5713
	struct ata_link *link = qc->dev->link;
L
Linus Torvalds 已提交
5714

5715 5716 5717 5718
	/* Make sure only one non-NCQ command is outstanding.  The
	 * check is skipped for old EH because it reuses active qc to
	 * request ATAPI sense.
	 */
T
Tejun Heo 已提交
5719
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5720 5721

	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5722
		WARN_ON(link->sactive & (1 << qc->tag));
5723 5724 5725

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5726
		link->sactive |= 1 << qc->tag;
5727
	} else {
T
Tejun Heo 已提交
5728
		WARN_ON(link->sactive);
5729 5730

		ap->nr_active_links++;
T
Tejun Heo 已提交
5731
		link->active_tag = qc->tag;
5732 5733
	}

5734
	qc->flags |= ATA_QCFLAG_ACTIVE;
5735
	ap->qc_active |= 1 << qc->tag;
5736

L
Linus Torvalds 已提交
5737 5738 5739
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5740
				goto sg_err;
L
Linus Torvalds 已提交
5741 5742
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5743
				goto sg_err;
L
Linus Torvalds 已提交
5744 5745 5746 5747 5748 5749 5750
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5751 5752 5753 5754
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5755

5756 5757
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5758 5759 5760
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771
}

/**
 *	ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
 *	@qc: command to issue to device
 *
 *	Using various libata functions and hooks, this function
 *	starts an ATA command.  ATA commands are grouped into
 *	classes called "protocols", and issuing each type of protocol
 *	is slightly different.
 *
E
Edward Falk 已提交
5772 5773
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5774
 *	LOCKING:
J
Jeff Garzik 已提交
5775
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5776 5777
 *
 *	RETURNS:
5778
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5779 5780
 */

5781
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5782 5783 5784
{
	struct ata_port *ap = qc->ap;

5785 5786 5787 5788 5789 5790
	/* Use polling pio if the LLD doesn't handle
	 * interrupt driven pio and atapi CDB interrupt.
	 */
	if (ap->flags & ATA_FLAG_PIO_POLLING) {
		switch (qc->tf.protocol) {
		case ATA_PROT_PIO:
5791
		case ATA_PROT_NODATA:
5792 5793 5794 5795 5796 5797
		case ATA_PROT_ATAPI:
		case ATA_PROT_ATAPI_NODATA:
			qc->tf.flags |= ATA_TFLAG_POLLING;
			break;
		case ATA_PROT_ATAPI_DMA:
			if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
5798
				/* see ata_dma_blacklisted() */
5799 5800 5801 5802 5803 5804 5805
				BUG();
			break;
		default:
			break;
		}
	}

5806
	/* select the device */
L
Linus Torvalds 已提交
5807 5808
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5809
	/* start the command */
L
Linus Torvalds 已提交
5810 5811
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5812 5813 5814
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5815
		ata_tf_to_host(ap, &qc->tf);
5816 5817 5818
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5819
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5820

L
Linus Torvalds 已提交
5821 5822 5823
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5824
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5825

L
Linus Torvalds 已提交
5826 5827 5828
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
		ap->ops->bmdma_start(qc);	    /* initiate bmdma */
5829
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5830 5831
		break;

5832 5833 5834
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5835

J
Jeff Garzik 已提交
5836
		ata_tf_to_host(ap, &qc->tf);
5837

5838 5839 5840
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5841
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5842 5843

			/* always send first data block using
5844
			 * the ata_pio_task() codepath.
5845
			 */
5846
		} else {
5847 5848 5849 5850
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5851
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5852 5853 5854 5855

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5856 5857
		}

L
Linus Torvalds 已提交
5858 5859 5860 5861
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5862 5863 5864
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5865
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5866

5867 5868 5869 5870 5871
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
		    (qc->tf.flags & ATA_TFLAG_POLLING))
5872
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5873 5874 5875
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5876
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5877

L
Linus Torvalds 已提交
5878 5879
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5880 5881 5882 5883
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5884
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5885 5886 5887 5888
		break;

	default:
		WARN_ON(1);
5889
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904
	}

	return 0;
}

/**
 *	ata_host_intr - Handle host interrupt for given (port, task)
 *	@ap: Port on which interrupt arrived (possibly...)
 *	@qc: Taskfile currently active in engine
 *
 *	Handle host interrupt for given queued command.  Currently,
 *	only DMA interrupts are handled.  All other commands are
 *	handled via polling with interrupts disabled (nIEN bit).
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5905
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5906 5907 5908 5909 5910 5911 5912 5913
 *
 *	RETURNS:
 *	One if interrupt was handled, zero if not (shared irq).
 */

inline unsigned int ata_host_intr (struct ata_port *ap,
				   struct ata_queued_cmd *qc)
{
T
Tejun Heo 已提交
5914
	struct ata_eh_info *ehi = &ap->link.eh_info;
5915
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5916

5917
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5918
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5919

5920 5921 5922
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5923 5924 5925
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5926

5927 5928 5929 5930 5931
		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
		 * The flag was turned on only for atapi devices.
		 * No need to check is_atapi_taskfile(&qc->tf) again.
		 */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
L
Linus Torvalds 已提交
5932 5933
			goto idle_irq;
		break;
5934 5935 5936 5937 5938
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
5939 5940
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5941 5942 5943 5944 5945 5946 5947

			/* if it's not our irq... */
			if (!(host_stat & ATA_DMA_INTR))
				goto idle_irq;

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
5948 5949 5950 5951 5952 5953

			if (unlikely(host_stat & ATA_DMA_ERR)) {
				/* error when transfering data to/from memory */
				qc->err_mask |= AC_ERR_HOST_BUS;
				ap->hsm_task_state = HSM_ST_ERR;
			}
5954 5955 5956 5957
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5958 5959 5960 5961
	default:
		goto idle_irq;
	}

5962 5963 5964 5965
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5966

5967 5968 5969 5970
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5971

5972 5973
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5974

5975
	ata_hsm_move(ap, qc, status, 0);
5976 5977 5978 5979 5980

	if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
				       qc->tf.protocol == ATA_PROT_ATAPI_DMA))
		ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);

L
Linus Torvalds 已提交
5981 5982 5983 5984 5985 5986 5987
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5988 5989
		ata_chk_status(ap);
		ap->ops->irq_clear(ap);
5990
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5991
		return 1;
L
Linus Torvalds 已提交
5992 5993 5994 5995 5996 5997 5998
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5999
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
6000
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
6001
 *
J
Jeff Garzik 已提交
6002 6003 6004
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
6005
 *	LOCKING:
J
Jeff Garzik 已提交
6006
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
6007 6008
 *
 *	RETURNS:
J
Jeff Garzik 已提交
6009
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
6010 6011
 */

6012
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
6013
{
J
Jeff Garzik 已提交
6014
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
6015 6016 6017 6018 6019
	unsigned int i;
	unsigned int handled = 0;
	unsigned long flags;

	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
J
Jeff Garzik 已提交
6020
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
6021

J
Jeff Garzik 已提交
6022
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
6023 6024
		struct ata_port *ap;

J
Jeff Garzik 已提交
6025
		ap = host->ports[i];
6026
		if (ap &&
J
Jeff Garzik 已提交
6027
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
6028 6029
			struct ata_queued_cmd *qc;

T
Tejun Heo 已提交
6030
			qc = ata_qc_from_tag(ap, ap->link.active_tag);
6031
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6032
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
6033 6034 6035 6036
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
6037
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
6038 6039 6040 6041

	return IRQ_RETVAL(handled);
}

6042 6043
/**
 *	sata_scr_valid - test whether SCRs are accessible
6044
 *	@link: ATA link to test SCR accessibility for
6045
 *
6046
 *	Test whether SCRs are accessible for @link.
6047 6048 6049 6050 6051 6052 6053
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
6054
int sata_scr_valid(struct ata_link *link)
6055
{
6056 6057
	struct ata_port *ap = link->ap;

6058
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6059 6060 6061 6062
}

/**
 *	sata_scr_read - read SCR register of the specified port
6063
 *	@link: ATA link to read SCR for
6064 6065 6066
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
6067
 *	Read SCR register @reg of @link into *@val.  This function is
6068 6069
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6070 6071
 *
 *	LOCKING:
6072
 *	None if @link is ap->link.  Kernel thread context otherwise.
6073 6074 6075 6076
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6077
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6078
{
6079 6080
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
6081

6082 6083 6084 6085 6086 6087
		if (sata_scr_valid(link))
			return ap->ops->scr_read(ap, reg, val);
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
6088 6089 6090 6091
}

/**
 *	sata_scr_write - write SCR register of the specified port
6092
 *	@link: ATA link to write SCR for
6093 6094 6095
 *	@reg: SCR to write
 *	@val: value to write
 *
6096
 *	Write @val to SCR register @reg of @link.  This function is
6097 6098
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6099 6100
 *
 *	LOCKING:
6101
 *	None if @link is ap->link.  Kernel thread context otherwise.
6102 6103 6104 6105
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6106
int sata_scr_write(struct ata_link *link, int reg, u32 val)
6107
{
6108 6109 6110 6111 6112 6113 6114
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;

		if (sata_scr_valid(link))
			return ap->ops->scr_write(ap, reg, val);
		return -EOPNOTSUPP;
	}
6115

6116
	return sata_pmp_scr_write(link, reg, val);
6117 6118 6119 6120
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
6121
 *	@link: ATA link to write SCR for
6122 6123 6124 6125 6126 6127 6128
 *	@reg: SCR to write
 *	@val: value to write
 *
 *	This function is identical to sata_scr_write() except that this
 *	function performs flush after writing to the register.
 *
 *	LOCKING:
6129
 *	None if @link is ap->link.  Kernel thread context otherwise.
6130 6131 6132 6133
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6134
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6135
{
6136 6137 6138
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
		int rc;
6139

6140 6141 6142 6143 6144 6145 6146
		if (sata_scr_valid(link)) {
			rc = ap->ops->scr_write(ap, reg, val);
			if (rc == 0)
				rc = ap->ops->scr_read(ap, reg, &val);
			return rc;
		}
		return -EOPNOTSUPP;
6147
	}
6148 6149

	return sata_pmp_scr_write(link, reg, val);
6150 6151 6152
}

/**
6153 6154
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
6155
 *
6156 6157 6158
 *	Test whether @link is online.  Note that this function returns
 *	0 if online status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
6159 6160 6161 6162 6163 6164 6165
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
6166
int ata_link_online(struct ata_link *link)
6167 6168 6169
{
	u32 sstatus;

6170 6171
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
6172 6173 6174 6175 6176
		return 1;
	return 0;
}

/**
6177 6178
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
6179
 *
6180 6181 6182
 *	Test whether @link is offline.  Note that this function
 *	returns 0 if offline status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
6183 6184 6185 6186 6187 6188 6189
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
6190
int ata_link_offline(struct ata_link *link)
6191 6192 6193
{
	u32 sstatus;

6194 6195
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
6196 6197 6198
		return 1;
	return 0;
}
E
Edward Falk 已提交
6199

6200
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
6201
{
6202
	unsigned int err_mask;
J
Jens Axboe 已提交
6203 6204 6205 6206 6207
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

6208
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
6209 6210 6211 6212
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

6213 6214 6215 6216
	/* This is wrong. On a failed flush we get back the LBA of the lost
	   sector and we should (assuming it wasn't aborted as unknown) issue
	   a further flush command to continue the writeback until it 
	   does not error */
6217 6218 6219 6220 6221 6222 6223
	err_mask = ata_do_simple_cmd(dev, cmd);
	if (err_mask) {
		ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
		return -EIO;
	}

	return 0;
J
Jens Axboe 已提交
6224 6225
}

6226
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6227 6228 6229
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
6230 6231 6232 6233
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
6234 6235
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6236
		struct ata_link *link;
6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255

		/* Previous resume operation might still be in
		 * progress.  Wait for PM_PENDING to clear.
		 */
		if (ap->pflags & ATA_PFLAG_PM_PENDING) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
		}

		/* request PM ops to EH */
		spin_lock_irqsave(ap->lock, flags);

		ap->pm_mesg = mesg;
		if (wait) {
			rc = 0;
			ap->pm_result = &rc;
		}

		ap->pflags |= ATA_PFLAG_PM_PENDING;
6256 6257 6258 6259
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277

		ata_port_schedule_eh(ap);

		spin_unlock_irqrestore(ap->lock, flags);

		/* wait and check result */
		if (wait) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
			if (rc)
				return rc;
		}
	}

	return 0;
}

/**
J
Jeff Garzik 已提交
6278 6279
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
6280 6281
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
6282
 *	Suspend @host.  Actual operation is performed by EH.  This
6283 6284 6285 6286 6287 6288 6289 6290 6291
 *	function requests EH to perform PM operations and waits for EH
 *	to finish.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
J
Jeff Garzik 已提交
6292
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6293
{
6294
	int rc;
6295

J
Jeff Garzik 已提交
6296
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6297 6298
	if (rc == 0)
		host->dev->power.power_state = mesg;
6299 6300 6301 6302
	return rc;
}

/**
J
Jeff Garzik 已提交
6303 6304
 *	ata_host_resume - resume host
 *	@host: host to resume
6305
 *
J
Jeff Garzik 已提交
6306
 *	Resume @host.  Actual operation is performed by EH.  This
6307 6308 6309 6310 6311 6312
 *	function requests EH to perform PM operations and returns.
 *	Note that all resume operations are performed parallely.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
J
Jeff Garzik 已提交
6313
void ata_host_resume(struct ata_host *host)
6314
{
J
Jeff Garzik 已提交
6315 6316 6317
	ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
	host->dev->power.power_state = PMSG_ON;
6318
}
6319
#endif
6320

6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332
/**
 *	ata_port_start - Set port up for dma.
 *	@ap: Port to initialize
 *
 *	Called just after data structures for each port are
 *	initialized.  Allocates space for PRD table.
 *
 *	May be used as the port_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
6333
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
6334
{
6335
	struct device *dev = ap->dev;
6336
	int rc;
L
Linus Torvalds 已提交
6337

6338 6339
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
6340 6341 6342
	if (!ap->prd)
		return -ENOMEM;

6343
	rc = ata_pad_alloc(ap, dev);
6344
	if (rc)
6345
		return rc;
L
Linus Torvalds 已提交
6346

6347 6348
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
6349 6350 6351
	return 0;
}

6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362
/**
 *	ata_dev_init - Initialize an ata_device structure
 *	@dev: Device structure to initialize
 *
 *	Initialize @dev in preparation for probing.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
void ata_dev_init(struct ata_device *dev)
{
T
Tejun Heo 已提交
6363 6364
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
6365 6366
	unsigned long flags;

6367
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
6368 6369
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
6370

6371 6372
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6373
	 * host lock.
6374
	 */
6375
	spin_lock_irqsave(ap->lock, flags);
6376
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6377
	dev->horkage = 0;
6378
	spin_unlock_irqrestore(ap->lock, flags);
6379

6380 6381
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6382 6383 6384 6385 6386
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

6387 6388 6389 6390
/**
 *	ata_link_init - Initialize an ata_link structure
 *	@ap: ATA port link is attached to
 *	@link: Link structure to initialize
T
Tejun Heo 已提交
6391
 *	@pmp: Port multiplier port number
6392 6393 6394 6395 6396 6397
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
6398
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6399 6400 6401 6402 6403 6404 6405
{
	int i;

	/* clear everything except for devices */
	memset(link, 0, offsetof(struct ata_link, device[0]));

	link->ap = ap;
T
Tejun Heo 已提交
6406
	link->pmp = pmp;
6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

	/* can't use iterator, ap isn't initialized yet */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &link->device[i];

		dev->link = link;
		dev->devno = dev - link->device;
		ata_dev_init(dev);
	}
}

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
6433
int sata_link_init_spd(struct ata_link *link)
6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450
{
	u32 scontrol, spd;
	int rc;

	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
	if (rc)
		return rc;

	spd = (scontrol >> 4) & 0xf;
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
6451
/**
6452 6453
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6454
 *
6455 6456 6457 6458
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6459
 *
L
Linus Torvalds 已提交
6460
 *	LOCKING:
6461
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6462
 */
6463
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6464
{
6465
	struct ata_port *ap;
L
Linus Torvalds 已提交
6466

6467 6468 6469 6470 6471 6472
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;

6473
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6474
	ap->lock = &host->lock;
6475
	ap->flags = ATA_FLAG_DISABLED;
6476
	ap->print_id = -1;
L
Linus Torvalds 已提交
6477
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6478
	ap->host = host;
6479
	ap->dev = host->dev;
L
Linus Torvalds 已提交
6480
	ap->last_ctl = 0xFF;
6481 6482 6483 6484 6485 6486

#if defined(ATA_VERBOSE_DEBUG)
	/* turn on all debugging levels */
	ap->msg_enable = 0x00FF;
#elif defined(ATA_DEBUG)
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
T
Tejun Heo 已提交
6487
#else
6488
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6489
#endif
L
Linus Torvalds 已提交
6490

6491 6492 6493
	INIT_DELAYED_WORK(&ap->port_task, NULL);
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6494
	INIT_LIST_HEAD(&ap->eh_done_q);
6495
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6496 6497 6498
	init_timer_deferrable(&ap->fastdrain_timer);
	ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
	ap->fastdrain_timer.data = (unsigned long)ap;
L
Linus Torvalds 已提交
6499

6500 6501
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
6502
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
6503 6504 6505 6506 6507 6508 6509 6510

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
	return ap;
}

6511 6512 6513 6514 6515 6516 6517 6518
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6519 6520 6521 6522
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6523 6524 6525
			ap->ops->port_stop(ap);
	}

6526
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6527
		host->ops->host_stop(host);
6528

6529 6530 6531
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6532 6533 6534 6535
		if (!ap)
			continue;

		if (ap->scsi_host)
6536 6537
			scsi_host_put(ap->scsi_host);

6538
		kfree(ap->pmp_link);
6539
		kfree(ap);
6540 6541 6542
		host->ports[i] = NULL;
	}

6543
	dev_set_drvdata(gendev, NULL);
6544 6545
}

6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return NULL;

	/* alloc a container for our list of ATA ports (buses) */
	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
	/* alloc a container for our list of ATA ports (buses) */
	host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
	if (!host)
		goto err_out;

	devres_add(dev, host);
	dev_set_drvdata(dev, host);

	spin_lock_init(&host->lock);
	host->dev = dev;
	host->n_ports = max_ports;

	/* allocate ports bound to this host */
	for (i = 0; i < max_ports; i++) {
		struct ata_port *ap;

		ap = ata_port_alloc(host);
		if (!ap)
			goto err_out;

		ap->port_no = i;
		host->ports[i] = ap;
	}

	devres_remove_group(dev, NULL);
	return host;

 err_out:
	devres_release_group(dev, NULL);
	return NULL;
}

6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

	host = ata_host_alloc(dev, n_ports);
	if (!host)
		return NULL;

	for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (ppi[j])
			pi = ppi[j++];

		ap->pio_mask = pi->pio_mask;
		ap->mwdma_mask = pi->mwdma_mask;
		ap->udma_mask = pi->udma_mask;
		ap->flags |= pi->flags;
6649
		ap->link.flags |= pi->link_flags;
6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660
		ap->ops = pi->port_ops;

		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
			host->ops = pi->port_ops;
		if (!host->private_data && pi->private_data)
			host->private_data = pi->private_data;
	}

	return host;
}

6661 6662 6663 6664 6665 6666 6667
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
6668 6669
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
	int i, rc;

	if (host->flags & ATA_HOST_STARTED)
		return 0;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6687 6688 6689
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
				ata_port_printk(ap, KERN_ERR, "failed to "
						"start port (errno=%d)\n", rc);
				goto err_out;
			}
		}

		ata_eh_freeze_port(ap);
	}

	host->flags |= ATA_HOST_STARTED;
	return 0;

 err_out:
	while (--i >= 0) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}
	return rc;
}

6715
/**
J
Jeff Garzik 已提交
6716 6717 6718 6719 6720
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6721 6722 6723 6724 6725
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6726
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6727 6728
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6729
{
J
Jeff Garzik 已提交
6730 6731 6732 6733
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6734 6735
}

6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
		dev_printk(KERN_ERR, host->dev,
			   "BUG: trying to register unstarted host\n");
		WARN_ON(1);
		return -EINVAL;
	}

	/* Blow away unused ports.  This happens when LLD can't
	 * determine the exact number of ports to allocate at
	 * allocation time.
	 */
	for (i = host->n_ports; host->ports[i]; i++)
		kfree(host->ports[i]);

	/* give ports names and add SCSI hosts */
	for (i = 0; i < host->n_ports; i++)
		host->ports[i]->print_id = ata_print_id++;

	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
		return rc;

6779 6780 6781
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6782 6783 6784 6785 6786 6787 6788 6789 6790 6791
	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		unsigned long xfer_mask;

		/* set SATA cable type if still unset */
		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
			ap->cbl = ATA_CBL_SATA;

		/* init sata_spd_limit to the current value */
6792
		sata_link_init_spd(&ap->link);
6793

6794
		/* print per-port info to dmesg */
6795 6796 6797
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6798
		if (!ata_port_is_dummy(ap)) {
6799 6800
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6801
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6802
					ata_mode_string(xfer_mask),
6803
					ap->link.eh_info.desc);
6804 6805
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int rc;

		/* probe */
		if (ap->ops->error_handler) {
T
Tejun Heo 已提交
6817
			struct ata_eh_info *ehi = &ap->link.eh_info;
6818 6819 6820 6821 6822 6823 6824
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
			spin_lock_irqsave(ap->lock, flags);

6825 6826
			ehi->probe_mask =
				(1 << ata_link_max_devices(&ap->link)) - 1;
6827 6828 6829
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

6830
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858
			ap->pflags |= ATA_PFLAG_LOADING;
			ata_port_schedule_eh(ap);

			spin_unlock_irqrestore(ap->lock, flags);

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
			rc = ata_bus_probe(ap);
			DPRINTK("ata%u: bus probe end\n", ap->print_id);

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
	}

	/* probes are done, now scan each port's disk(s) */
	DPRINTK("host probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6859
		ata_scsi_scan_host(ap, 1);
6860 6861 6862 6863 6864
	}

	return 0;
}

6865 6866 6867 6868 6869 6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883 6884 6885 6886 6887
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
6888
	int i, rc;
6889 6890 6891 6892 6893 6894 6895 6896 6897 6898

	rc = ata_host_start(host);
	if (rc)
		return rc;

	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6899 6900
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6901

6902 6903 6904 6905 6906 6907 6908 6909
	rc = ata_host_register(host, sht);
	/* if failed, just free the IRQ and leave ports alone */
	if (rc)
		devm_free_irq(host->dev, irq, host);

	return rc;
}

6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923
/**
 *	ata_port_detach - Detach ATA port in prepration of device removal
 *	@ap: ATA port to be detached
 *
 *	Detach all ATA devices and the associated SCSI devices of @ap;
 *	then, remove the associated SCSI host.  @ap is guaranteed to
 *	be quiescent on return from this function.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_port_detach(struct ata_port *ap)
{
	unsigned long flags;
6924
	struct ata_link *link;
6925
	struct ata_device *dev;
6926 6927

	if (!ap->ops->error_handler)
6928
		goto skip_eh;
6929 6930

	/* tell EH we're leaving & flush EH */
6931
	spin_lock_irqsave(ap->lock, flags);
6932
	ap->pflags |= ATA_PFLAG_UNLOADING;
6933
	spin_unlock_irqrestore(ap->lock, flags);
6934 6935 6936 6937 6938 6939

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6940
	spin_lock_irqsave(ap->lock, flags);
6941

6942 6943 6944 6945
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
6946

6947
	spin_unlock_irqrestore(ap->lock, flags);
6948 6949 6950 6951 6952

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6953
	spin_lock_irqsave(ap->lock, flags);
6954
	ata_port_freeze(ap);	/* won't be thawed */
6955
	spin_unlock_irqrestore(ap->lock, flags);
6956 6957

	ata_port_wait_eh(ap);
6958
	cancel_rearming_delayed_work(&ap->hotplug_task);
6959

6960
 skip_eh:
6961
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6962
	scsi_remove_host(ap->scsi_host);
6963 6964
}

T
Tejun Heo 已提交
6965 6966 6967 6968 6969 6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
}

L
Linus Torvalds 已提交
6982 6983 6984
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6985 6986 6987 6988 6989 6990 6991
 *
 *	Utility function which initializes data_addr, error_addr,
 *	feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
 *	device_addr, status_addr, and command_addr to standard offsets
 *	relative to cmd_addr.
 *
 *	Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
L
Linus Torvalds 已提交
6992
 */
E
Edward Falk 已提交
6993

L
Linus Torvalds 已提交
6994 6995 6996 6997 6998 6999 7000 7001 7002 7003 7004 7005 7006 7007
void ata_std_ports(struct ata_ioports *ioaddr)
{
	ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
	ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
	ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
	ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
	ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
	ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
	ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
	ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
	ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
	ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
}

E
Edward Falk 已提交
7008

7009 7010
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
7011 7012 7013 7014
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
7015 7016 7017
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
7018 7019 7020 7021
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
7022
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
7023
{
7024
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
7025
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
7026

T
Tejun Heo 已提交
7027
	ata_host_detach(host);
L
Linus Torvalds 已提交
7028 7029 7030
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
7031
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
7032 7033 7034 7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062
{
	unsigned long tmp = 0;

	switch (bits->width) {
	case 1: {
		u8 tmp8 = 0;
		pci_read_config_byte(pdev, bits->reg, &tmp8);
		tmp = tmp8;
		break;
	}
	case 2: {
		u16 tmp16 = 0;
		pci_read_config_word(pdev, bits->reg, &tmp16);
		tmp = tmp16;
		break;
	}
	case 4: {
		u32 tmp32 = 0;
		pci_read_config_dword(pdev, bits->reg, &tmp32);
		tmp = tmp32;
		break;
	}

	default:
		return -EINVAL;
	}

	tmp &= bits->mask;

	return (tmp == bits->val) ? 1 : 0;
}
J
Jens Axboe 已提交
7063

7064
#ifdef CONFIG_PM
7065
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
7066 7067
{
	pci_save_state(pdev);
7068
	pci_disable_device(pdev);
7069

7070
	if (mesg.event == PM_EVENT_SUSPEND)
7071
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
7072 7073
}

7074
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
7075
{
7076 7077
	int rc;

J
Jens Axboe 已提交
7078 7079
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
7080

T
Tejun Heo 已提交
7081
	rc = pcim_enable_device(pdev);
7082 7083 7084 7085 7086 7087
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
7088
	pci_set_master(pdev);
7089
	return 0;
7090 7091
}

7092
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7093
{
J
Jeff Garzik 已提交
7094
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7095 7096
	int rc = 0;

J
Jeff Garzik 已提交
7097
	rc = ata_host_suspend(host, mesg);
7098 7099 7100
	if (rc)
		return rc;

7101
	ata_pci_device_do_suspend(pdev, mesg);
7102 7103 7104 7105 7106 7107

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
7108
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7109
	int rc;
7110

7111 7112 7113 7114
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
7115
}
7116 7117
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
7118 7119 7120 7121 7122
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
7123
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
7124 7125 7126 7127
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

7128 7129 7130 7131 7132 7133
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
7134 7135 7136 7137 7138 7139 7140
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
7141
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
7142 7143
}

7144
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
7145 7146
module_exit(ata_exit);

7147
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
7148
static DEFINE_SPINLOCK(ata_ratelimit_lock);
7149 7150 7151 7152 7153 7154 7155 7156 7157 7158 7159 7160 7161 7162 7163 7164 7165 7166 7167

int ata_ratelimit(void)
{
	int rc;
	unsigned long flags;

	spin_lock_irqsave(&ata_ratelimit_lock, flags);

	if (time_after(jiffies, ratelimit_time)) {
		rc = 1;
		ratelimit_time = jiffies + (HZ/5);
	} else
		rc = 0;

	spin_unlock_irqrestore(&ata_ratelimit_lock, flags);

	return rc;
}

7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184 7185 7186 7187 7188 7189 7190 7191 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

	/* Calculate timeout _after_ the first read to make sure
	 * preceding writes reach the controller before starting to
	 * eat away the timeout.
	 */
	timeout = jiffies + (timeout_msec * HZ) / 1000;

	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
		msleep(interval_msec);
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
7214 7215 7216 7217 7218 7219 7220 7221 7222 7223 7224 7225 7226 7227 7228 7229 7230 7231 7232 7233 7234 7235 7236 7237 7238 7239 7240 7241 7242 7243 7244 7245
/*
 * Dummy port_ops
 */
static void ata_dummy_noret(struct ata_port *ap)	{ }
static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }

static u8 ata_dummy_check_status(struct ata_port *ap)
{
	return ATA_DRDY;
}

static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
{
	return AC_ERR_SYSTEM;
}

const struct ata_port_operations ata_dummy_port_ops = {
	.check_status		= ata_dummy_check_status,
	.check_altstatus	= ata_dummy_check_status,
	.dev_select		= ata_noop_dev_select,
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
	.freeze			= ata_dummy_noret,
	.thaw			= ata_dummy_noret,
	.error_handler		= ata_dummy_noret,
	.post_internal_cmd	= ata_dummy_qc_noret,
	.irq_clear		= ata_dummy_noret,
	.port_start		= ata_dummy_ret0,
	.port_stop		= ata_dummy_noret,
};

7246 7247 7248 7249
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
7250 7251 7252 7253 7254 7255 7256
/*
 * libata is essentially a library of internal helper functions for
 * low-level ATA host controller drivers.  As such, the API/ABI is
 * likely to change as new drivers are added and updated.
 * Do not depend on ABI/API stability.
 */

7257 7258 7259
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
T
Tejun Heo 已提交
7260
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7261
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
7262 7263
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
7264
EXPORT_SYMBOL_GPL(ata_host_init);
7265
EXPORT_SYMBOL_GPL(ata_host_alloc);
7266
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7267
EXPORT_SYMBOL_GPL(ata_host_start);
7268
EXPORT_SYMBOL_GPL(ata_host_register);
7269
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
7270
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
7271 7272
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
7273
EXPORT_SYMBOL_GPL(ata_hsm_move);
7274
EXPORT_SYMBOL_GPL(ata_qc_complete);
7275
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
7276 7277 7278 7279 7280
EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
7281
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
7282 7283 7284 7285 7286 7287
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
7288
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
7289
EXPORT_SYMBOL_GPL(ata_interrupt);
7290
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
7291 7292
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7293
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
L
Linus Torvalds 已提交
7294
EXPORT_SYMBOL_GPL(ata_qc_prep);
7295
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7296
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
7297 7298 7299 7300 7301
EXPORT_SYMBOL_GPL(ata_bmdma_setup);
EXPORT_SYMBOL_GPL(ata_bmdma_start);
EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
EXPORT_SYMBOL_GPL(ata_bmdma_status);
EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7302 7303 7304 7305 7306
EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
L
Linus Torvalds 已提交
7307
EXPORT_SYMBOL_GPL(ata_port_probe);
7308
EXPORT_SYMBOL_GPL(ata_dev_disable);
7309
EXPORT_SYMBOL_GPL(sata_set_spd);
7310 7311
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
L
Linus Torvalds 已提交
7312 7313 7314
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
7315
EXPORT_SYMBOL_GPL(ata_std_prereset);
7316
EXPORT_SYMBOL_GPL(ata_std_softreset);
T
Tejun Heo 已提交
7317
EXPORT_SYMBOL_GPL(sata_link_hardreset);
7318 7319
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
7320 7321
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
7322
EXPORT_SYMBOL_GPL(ata_port_disable);
7323
EXPORT_SYMBOL_GPL(ata_ratelimit);
7324
EXPORT_SYMBOL_GPL(ata_wait_register);
7325
EXPORT_SYMBOL_GPL(ata_busy_sleep);
7326
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
7327
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
7328 7329 7330
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7331
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7332
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
7333
EXPORT_SYMBOL_GPL(ata_host_intr);
7334 7335 7336 7337
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7338 7339
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
7340
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
7341 7342
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
7343
#endif /* CONFIG_PM */
7344 7345
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
7346
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
L
Linus Torvalds 已提交
7347 7348
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

7349
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
7350 7351 7352
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
7353 7354
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
7355
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
T
Tejun Heo 已提交
7356
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7357
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
L
Linus Torvalds 已提交
7358 7359
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7360
#ifdef CONFIG_PM
7361 7362
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
7363 7364
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7365
#endif /* CONFIG_PM */
A
Alan Cox 已提交
7366 7367
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
7368
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
7369

7370
EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7371 7372 7373 7374 7375
EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
EXPORT_SYMBOL_GPL(sata_pmp_do_eh);

T
Tejun Heo 已提交
7376 7377 7378
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7379 7380 7381 7382
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
7383
EXPORT_SYMBOL_GPL(ata_eng_timeout);
7384
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7385
EXPORT_SYMBOL_GPL(ata_link_abort);
7386
EXPORT_SYMBOL_GPL(ata_port_abort);
7387
EXPORT_SYMBOL_GPL(ata_port_freeze);
7388
EXPORT_SYMBOL_GPL(sata_async_notification);
7389 7390
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7391 7392
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
7393
EXPORT_SYMBOL_GPL(ata_do_eh);
7394
EXPORT_SYMBOL_GPL(ata_irq_on);
A
Akira Iguchi 已提交
7395
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
7396 7397 7398 7399 7400

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
EXPORT_SYMBOL_GPL(ata_cable_sata);