libata-core.c 170.1 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"

J
Jeff Garzik 已提交
62
#define DRV_VERSION	"2.21"	/* must be exactly four chars */
63 64


65
/* debounce timing parameters in msecs { interval, duration, timeout } */
66 67 68
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 };
69

T
Tejun Heo 已提交
70 71 72 73
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);
static void ata_dev_xfermask(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)");

J
Jeff Garzik 已提交
88 89 90 91
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
92 93 94 95
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)");

A
Andrew Morton 已提交
96 97 98 99
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)");

100 101
int libata_noacpi = 1;
module_param_named(noacpi, libata_noacpi, int, 0444);
102 103
MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");

L
Linus Torvalds 已提交
104 105 106 107 108
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

E
Edward Falk 已提交
109

L
Linus Torvalds 已提交
110 111 112 113 114 115 116 117 118 119 120 121 122
/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@fis: Buffer into which data will output
 *	@pmp: Port multiplier port
 *
 *	Converts a standard ATA taskfile to a Serial ATA
 *	FIS structure (Register - Host to Device).
 *
 *	LOCKING:
 *	Inherited from caller.
 */

J
Jeff Garzik 已提交
123
void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
L
Linus Torvalds 已提交
124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156
{
	fis[0] = 0x27;	/* Register - Host to Device FIS */
	fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
					    bit 7 indicates Command FIS */
	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
 *
157
 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
L
Linus Torvalds 已提交
158 159 160 161 162
 *
 *	LOCKING:
 *	Inherited from caller.
 */

J
Jeff Garzik 已提交
163
void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
L
Linus Torvalds 已提交
164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
{
	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];
}

181 182 183 184 185 186
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
187 188 189 190
	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
191 192 193 194 195
	/* 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
196 197 198 199
	0,
	0,
	0,
	0,
200 201 202 203
	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
T
Tejun Heo 已提交
204 205 206 207 208
	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
209
};
L
Linus Torvalds 已提交
210 211

/**
212
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
213 214
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
L
Linus Torvalds 已提交
215
 *
216
 *	Examine the device configuration and tf->flags to calculate
217
 *	the proper read/write commands and protocol to use.
L
Linus Torvalds 已提交
218 219 220 221
 *
 *	LOCKING:
 *	caller.
 */
222
static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
L
Linus Torvalds 已提交
223
{
T
Tejun Heo 已提交
224
	u8 cmd;
L
Linus Torvalds 已提交
225

T
Tejun Heo 已提交
226
	int index, fua, lba48, write;
227

T
Tejun Heo 已提交
228
	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
229 230
	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
L
Linus Torvalds 已提交
231

232 233
	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
234
		index = dev->multi_count ? 0 : 8;
235
	} else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
236 237
		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
238
		index = dev->multi_count ? 0 : 8;
239 240
	} else {
		tf->protocol = ATA_PROT_DMA;
T
Tejun Heo 已提交
241
		index = 16;
242
	}
L
Linus Torvalds 已提交
243

T
Tejun Heo 已提交
244 245 246 247 248 249
	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
L
Linus Torvalds 已提交
250 251
}

252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294
/**
 *	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;
}

295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321
/**
 *	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;

322
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417
		/* 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;
}

418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441
/**
 *	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);
}

442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464
/**
 *	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;
}

465
static const struct ata_xfer_ent {
466
	int shift, bits;
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542
	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
543
/**
544 545
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
L
Linus Torvalds 已提交
546 547
 *
 *	Determine string which represents the highest speed
548
 *	(highest bit in @modemask).
L
Linus Torvalds 已提交
549 550 551 552 553 554
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
555
 *	@mode_mask, or the constant C string "<n/a>".
L
Linus Torvalds 已提交
556
 */
557
static const char *ata_mode_string(unsigned int xfer_mask)
L
Linus Torvalds 已提交
558
{
559 560 561 562 563 564
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
565 566
		"PIO5",
		"PIO6",
567 568 569
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
570 571
		"MWDMA3",
		"MWDMA4",
572 573 574 575 576 577 578 579 580
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
581
	int highbit;
L
Linus Torvalds 已提交
582

583 584 585
	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
586 587 588
	return "<n/a>";
}

589 590 591 592 593 594 595 596 597 598 599 600
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
601
void ata_dev_disable(struct ata_device *dev)
602
{
T
Tejun Heo 已提交
603 604 605
	if (ata_dev_enabled(dev)) {
		if (ata_msg_drv(dev->ap))
			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
606 607
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
608 609 610 611
		dev->class++;
	}
}

L
Linus Torvalds 已提交
612
/**
T
Tejun Heo 已提交
613
 *	ata_devchk - PATA device presence detection
L
Linus Torvalds 已提交
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
 *	@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
630
static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
L
Linus Torvalds 已提交
631 632 633 634 635 636
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

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

T
Tejun Heo 已提交
637 638
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
639

T
Tejun Heo 已提交
640 641
	iowrite8(0xaa, ioaddr->nsect_addr);
	iowrite8(0x55, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
642

T
Tejun Heo 已提交
643 644
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
645

T
Tejun Heo 已提交
646 647
	nsect = ioread8(ioaddr->nsect_addr);
	lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670

	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:
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
 *	the event of failure.
 */

J
Jeff Garzik 已提交
671
unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
Linus Torvalds 已提交
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
{
	/* 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.
	 */

	if (((tf->lbam == 0) && (tf->lbah == 0)) ||
	    ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

	if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
	    ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
698
 *	@r_err: Value of error register on completion
L
Linus Torvalds 已提交
699 700 701 702 703 704 705 706 707 708 709 710
 *
 *	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.
711 712 713
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
L
Linus Torvalds 已提交
714 715
 */

A
Akira Iguchi 已提交
716
unsigned int
717
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
L
Linus Torvalds 已提交
718 719 720 721 722 723 724 725 726 727
{
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

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

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

	ap->ops->tf_read(ap, &tf);
728
	err = tf.feature;
729 730
	if (r_err)
		*r_err = err;
L
Linus Torvalds 已提交
731

732 733 734 735 736
	/* see if device passed diags: if master then continue and warn later */
	if (err == 0 && device == 0)
		/* diagnostic fail : do nothing _YET_ */
		ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
	else if (err == 1)
L
Linus Torvalds 已提交
737 738 739 740
		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
741
		return ATA_DEV_NONE;
L
Linus Torvalds 已提交
742

743
	/* determine if device is ATA or ATAPI */
L
Linus Torvalds 已提交
744
	class = ata_dev_classify(&tf);
745

L
Linus Torvalds 已提交
746
	if (class == ATA_DEV_UNKNOWN)
747
		return ATA_DEV_NONE;
L
Linus Torvalds 已提交
748
	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
749 750
		return ATA_DEV_NONE;
	return class;
L
Linus Torvalds 已提交
751 752 753
}

/**
754
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
Linus Torvalds 已提交
755 756 757 758 759 760 761 762 763 764 765 766 767
 *	@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.
 */

768 769
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
Linus Torvalds 已提交
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

787
/**
788
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
789 790 791 792 793
 *	@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.
 *
794
 *	This function is identical to ata_id_string except that it
795 796 797 798 799 800
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
801 802
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
803 804 805 806 807
{
	unsigned char *p;

	WARN_ON(!(len & 1));

808
	ata_id_string(id, s, ofs, len - 1);
809 810 811 812 813 814

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
Edward Falk 已提交
815

A
Alan Cox 已提交
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
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;
}

/**
 *	ata_read_native_max_address_ext	-	LBA48 native max query
 *	@dev: Device to query
 *
 *	Perform an LBA48 size query upon the device in question. Return the
 *	actual LBA48 size or zero if the command fails.
 */

static u64 ata_read_native_max_address_ext(struct ata_device *dev)
{
	unsigned int err;
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;
	tf.device |= 0x40;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba48(&tf);
}

/**
 *	ata_read_native_max_address	-	LBA28 native max query
 *	@dev: Device to query
 *
 *	Performa an LBA28 size query upon the device in question. Return the
 *	actual LBA28 size or zero if the command fails.
 */

static u64 ata_read_native_max_address(struct ata_device *dev)
{
	unsigned int err;
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_READ_NATIVE_MAX;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;
	tf.device |= 0x40;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba(&tf);
}

/**
 *	ata_set_native_max_address_ext	-	LBA48 native max set
 *	@dev: Device to query
R
Randy Dunlap 已提交
899
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
 *
 *	Perform an LBA48 size set max upon the device in question. Return the
 *	actual LBA48 size or zero if the command fails.
 */

static u64 ata_set_native_max_address_ext(struct ata_device *dev, u64 new_sectors)
{
	unsigned int err;
	struct ata_taskfile tf;

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_SET_MAX_EXT;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;
	tf.device |= 0x40;

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

	tf.hob_lbal = (new_sectors >> 24) & 0xff;
	tf.hob_lbam = (new_sectors >> 32) & 0xff;
	tf.hob_lbah = (new_sectors >> 40) & 0xff;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba48(&tf);
}

/**
 *	ata_set_native_max_address	-	LBA28 native max set
 *	@dev: Device to query
R
Randy Dunlap 已提交
937
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
 *
 *	Perform an LBA28 size set max upon the device in question. Return the
 *	actual LBA28 size or zero if the command fails.
 */

static u64 ata_set_native_max_address(struct ata_device *dev, u64 new_sectors)
{
	unsigned int err;
	struct ata_taskfile tf;

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_SET_MAX;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;

	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;
	tf.device |= ((new_sectors >> 24) & 0x0f) | 0x40;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba(&tf);
}

/**
 *	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.
 */

static u64 ata_hpa_resize(struct ata_device *dev)
{
	u64 sectors = dev->n_sectors;
	u64 hpa_sectors;
J
Jeff Garzik 已提交
981

A
Alan Cox 已提交
982 983 984 985 986 987 988 989 990 991
	if (ata_id_has_lba48(dev->id))
		hpa_sectors = ata_read_native_max_address_ext(dev);
	else
		hpa_sectors = ata_read_native_max_address(dev);

	if (hpa_sectors > sectors) {
		ata_dev_printk(dev, KERN_INFO,
			"Host Protected Area detected:\n"
			"\tcurrent size: %lld sectors\n"
			"\tnative size: %lld sectors\n",
A
Andrew Morton 已提交
992
			(long long)sectors, (long long)hpa_sectors);
A
Alan Cox 已提交
993 994 995 996 997

		if (ata_ignore_hpa) {
			if (ata_id_has_lba48(dev->id))
				hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
			else
A
Andrew Morton 已提交
998 999
				hpa_sectors = ata_set_native_max_address(dev,
								hpa_sectors);
A
Alan Cox 已提交
1000 1001

			if (hpa_sectors) {
A
Andrew Morton 已提交
1002 1003 1004
				ata_dev_printk(dev, KERN_INFO, "native size "
					"increased to %lld sectors\n",
					(long long)hpa_sectors);
A
Alan Cox 已提交
1005 1006 1007
				return hpa_sectors;
			}
		}
T
Tejun Heo 已提交
1008 1009 1010 1011 1012
	} else if (hpa_sectors < sectors)
		ata_dev_printk(dev, KERN_WARNING, "%s 1: hpa sectors (%lld) "
			       "is smaller than sectors (%lld)\n", __FUNCTION__,
			       (long long)hpa_sectors, (long long)sectors);

A
Alan Cox 已提交
1013 1014 1015
	return sectors;
}

1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
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];
	}
}

1031 1032 1033
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
R
Randy Dunlap 已提交
1034
 *	@unknown: mode to assume if we cannot tell
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 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
 *
 *	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
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
/**
 *	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
1085 1086 1087 1088
void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
{
}

E
Edward Falk 已提交
1089

L
Linus Torvalds 已提交
1090 1091 1092 1093 1094 1095 1096
/**
 *	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
1097 1098 1099
 *	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
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
 *
 *	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
1114
	iowrite8(tmp, ap->ioaddr.device_addr);
L
Linus Torvalds 已提交
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
	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
1140
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1141 1142
		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
L
Linus Torvalds 已提交
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157

	if (wait)
		ata_wait_idle(ap);

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

	if (wait) {
		if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
			msleep(150);
		ata_wait_idle(ap);
	}
}

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1158
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1159
 *
1160 1161
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1162 1163 1164 1165 1166
 *
 *	LOCKING:
 *	caller.
 */

1167
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1168 1169 1170 1171 1172 1173
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1174 1175 1176 1177 1178
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1179 1180 1181 1182 1183
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1184 1185 1186 1187 1188
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1189 1190
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1191 1192
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1193 1194
}

1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
/**
 *	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.
		 */
1224
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1225 1226 1227 1228
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

		/* 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;
1239

1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	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);
	}

1257 1258 1259
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1260 1261 1262 1263

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1264 1265 1266
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1267
 *	@fn: workqueue function to be scheduled
1268
 *	@data: data for @fn to use
1269
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
 *
 *	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.
 */
1283
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1284 1285
			 unsigned long delay)
{
1286 1287
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
Tejun Heo 已提交
1288

1289 1290
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
}

/**
 *	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");

1307
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1308

1309 1310
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
Tejun Heo 已提交
1311 1312
}

1313
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1314
{
1315
	struct completion *waiting = qc->private_data;
1316 1317 1318 1319 1320

	complete(waiting);
}

/**
1321
 *	ata_exec_internal_sg - execute libata internal command
1322 1323
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1324
 *	@cdb: CDB for packet command
1325
 *	@dma_dir: Data tranfer direction of the command
1326 1327
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1328 1329 1330 1331 1332 1333 1334 1335 1336
 *
 *	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.
1337 1338 1339
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1340
 */
1341 1342 1343 1344
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
			      int dma_dir, struct scatterlist *sg,
			      unsigned int n_elem)
1345
{
T
Tejun Heo 已提交
1346
	struct ata_port *ap = dev->ap;
1347 1348
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1349
	unsigned int tag, preempted_tag;
1350
	u32 preempted_sactive, preempted_qc_active;
1351
	DECLARE_COMPLETION_ONSTACK(wait);
1352
	unsigned long flags;
1353
	unsigned int err_mask;
1354
	int rc;
1355

1356
	spin_lock_irqsave(ap->lock, flags);
1357

1358
	/* no internal command while frozen */
1359
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1360
		spin_unlock_irqrestore(ap->lock, flags);
1361 1362 1363
		return AC_ERR_SYSTEM;
	}

1364
	/* initialize internal qc */
1365

1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	/* 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;

1376
	if (test_and_set_bit(tag, &ap->qc_allocated))
1377
		BUG();
1378
	qc = __ata_qc_from_tag(ap, tag);
1379 1380 1381 1382 1383 1384 1385 1386

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

	preempted_tag = ap->active_tag;
1387 1388
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1389
	ap->active_tag = ATA_TAG_POISON;
1390 1391
	ap->sactive = 0;
	ap->qc_active = 0;
1392 1393

	/* prepare & issue qc */
1394
	qc->tf = *tf;
1395 1396
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1397
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1398 1399
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1400 1401 1402 1403 1404 1405
		unsigned int i, buflen = 0;

		for (i = 0; i < n_elem; i++)
			buflen += sg[i].length;

		ata_sg_init(qc, sg, n_elem);
1406
		qc->nbytes = buflen;
1407 1408
	}

1409
	qc->private_data = &wait;
1410 1411
	qc->complete_fn = ata_qc_complete_internal;

1412
	ata_qc_issue(qc);
1413

1414
	spin_unlock_irqrestore(ap->lock, flags);
1415

A
Andrew Morton 已提交
1416
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1417 1418

	ata_port_flush_task(ap);
1419

1420
	if (!rc) {
1421
		spin_lock_irqsave(ap->lock, flags);
1422 1423 1424

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1425 1426
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1427
		 */
1428
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1429 1430 1431 1432 1433 1434
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1435

1436 1437
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1438
					"qc timeout (cmd 0x%x)\n", command);
1439 1440
		}

1441
		spin_unlock_irqrestore(ap->lock, flags);
1442 1443
	}

1444 1445 1446 1447
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
	/* 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;
1458 1459
	}

1460
	/* finish up */
1461
	spin_lock_irqsave(ap->lock, flags);
1462

1463
	*tf = qc->result_tf;
1464 1465 1466
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1467
	ap->active_tag = preempted_tag;
1468 1469
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1470

1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
	/* 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.
	 */
1482
	if (ap->flags & ATA_FLAG_DISABLED) {
1483 1484 1485 1486
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1487
	spin_unlock_irqrestore(ap->lock, flags);
1488

1489
	return err_mask;
1490 1491
}

1492
/**
1493
 *	ata_exec_internal - execute libata internal command
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
 *	@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
 *
 *	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,
			   int dma_dir, void *buf, unsigned int buflen)
{
1514 1515
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1516

1517 1518 1519 1520 1521 1522
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1523

1524
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1525 1526
}

1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
/**
 *	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
1540
 */
1541
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1542 1543 1544 1545 1546 1547 1548 1549 1550
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1551
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1552 1553
}

1554 1555 1556 1557 1558 1559 1560
/**
 *	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
1561

1562 1563
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1564 1565 1566
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
	if (adev->ap->flags & ATA_FLAG_NO_IORDY)
1567
		return 0;
A
Alan Cox 已提交
1568 1569 1570 1571 1572
	/* 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))
1573
		return 1;
A
Alan Cox 已提交
1574 1575
	return 0;
}
1576

A
Alan Cox 已提交
1577 1578 1579 1580 1581 1582 1583
/**
 *	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
1584

A
Alan Cox 已提交
1585 1586
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1587 1588
	/* 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
1589
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1590 1591 1592 1593
		/* 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
1594 1595
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1596 1597
		}
	}
A
Alan Cox 已提交
1598
	return 3 << ATA_SHIFT_PIO;
1599 1600
}

L
Linus Torvalds 已提交
1601
/**
1602 1603 1604
 *	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)
1605
 *	@flags: ATA_READID_* flags
1606
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1607
 *
1608 1609
 *	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
1610 1611
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1612 1613
 *
 *	LOCKING:
1614 1615 1616 1617
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1618
 */
1619
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1620
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1621
{
T
Tejun Heo 已提交
1622
	struct ata_port *ap = dev->ap;
1623
	unsigned int class = *p_class;
1624
	struct ata_taskfile tf;
1625 1626
	unsigned int err_mask = 0;
	const char *reason;
1627
	int may_fallback = 1, tried_spinup = 0;
1628
	int rc;
L
Linus Torvalds 已提交
1629

1630
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1631
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1632

1633 1634
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1635
	ata_tf_init(dev, &tf);
1636

1637 1638
	switch (class) {
	case ATA_DEV_ATA:
1639
		tf.command = ATA_CMD_ID_ATA;
1640 1641
		break;
	case ATA_DEV_ATAPI:
1642
		tf.command = ATA_CMD_ID_ATAPI;
1643 1644 1645 1646 1647
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1648 1649
	}

1650
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660

	/* 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
1661

T
Tejun Heo 已提交
1662
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1663
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1664
	if (err_mask) {
1665
		if (err_mask & AC_ERR_NODEV_HINT) {
1666
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1667
				ap->print_id, dev->devno);
1668 1669 1670
			return -ENOENT;
		}

1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
		/* 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;
		}

1686 1687
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1688 1689 1690
		goto err_out;
	}

1691 1692 1693 1694 1695
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1696
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1697

1698
	/* sanity check */
1699
	rc = -EINVAL;
A
Alan Cox 已提交
1700
	reason = "device reports invalid type";
1701 1702 1703 1704 1705 1706 1707

	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;
1708 1709
	}

1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
	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;
		err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
		if (err_mask) {
			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;
	}

1736
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1737 1738 1739 1740 1741 1742 1743 1744 1745
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
		 * IDENTIFY
		 * INITIALIZE DEVICE PARAMETERS
		 * anything else..
		 * Some drives were very specific about that exact sequence.
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1746
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1747 1748 1749 1750 1751 1752 1753 1754 1755
			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.
			 */
1756
			flags &= ~ATA_READID_POSTRESET;
1757 1758 1759 1760 1761
			goto retry;
		}
	}

	*p_class = class;
1762

1763 1764 1765
	return 0;

 err_out:
T
Tejun Heo 已提交
1766
	if (ata_msg_warn(ap))
1767
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1768
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1769 1770 1771
	return rc;
}

T
Tejun Heo 已提交
1772
static inline u8 ata_dev_knobble(struct ata_device *dev)
1773
{
T
Tejun Heo 已提交
1774
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1775 1776
}

1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
	struct ata_port *ap = dev->ap;
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
1787 1788 1789 1790
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1791
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1792
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1793 1794 1795 1796 1797 1798 1799 1800 1801
		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);
}

1802
/**
1803 1804 1805 1806 1807
 *	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.
1808 1809
 *
 *	LOCKING:
1810 1811 1812 1813
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1814
 */
1815
int ata_dev_configure(struct ata_device *dev)
1816
{
T
Tejun Heo 已提交
1817
	struct ata_port *ap = dev->ap;
T
Tejun Heo 已提交
1818 1819
	struct ata_eh_context *ehc = &ap->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1820
	const u16 *id = dev->id;
1821
	unsigned int xfer_mask;
1822
	char revbuf[7];		/* XYZ-99\0 */
1823 1824
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1825
	int rc;
1826

1827
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1828 1829
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1830
		return 0;
1831 1832
	}

1833
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1834
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1835

T
Tejun Heo 已提交
1836 1837 1838 1839
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1840

1841
	/* print device capabilities */
1842
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1843 1844 1845
		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",
1846
			       __FUNCTION__,
1847 1848
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1849

1850
	/* initialize to-be-configured parameters */
1851
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1852 1853 1854 1855 1856 1857 1858
	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
1859 1860 1861 1862
	/*
	 * common ATA, ATAPI feature tests
	 */

1863
	/* find max transfer mode; for printk only */
1864
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1865

1866 1867
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1868

1869 1870 1871 1872 1873 1874 1875
	/* 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
1876 1877
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1878 1879
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1880 1881 1882
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1883 1884 1885 1886 1887
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1888
		dev->n_sectors = ata_id_n_sectors(id);
1889

1890 1891 1892
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1893
		if (ata_id_has_lba(id)) {
1894
			const char *lba_desc;
1895
			char ncq_desc[20];
1896

1897 1898
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1899
			if (ata_id_has_lba48(id)) {
1900
				dev->flags |= ATA_DFLAG_LBA48;
1901
				lba_desc = "LBA48";
1902 1903 1904 1905

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1906
			}
1907

A
Alan Cox 已提交
1908 1909 1910
			if (ata_id_hpa_enabled(dev->id))
				dev->n_sectors = ata_hpa_resize(dev);

1911 1912 1913
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1914
			/* print device info to dmesg */
1915 1916 1917 1918 1919 1920 1921
			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",
1922
					(unsigned long long)dev->n_sectors,
1923 1924
					dev->multi_count, lba_desc, ncq_desc);
			}
1925
		} else {
1926 1927 1928
			/* CHS */

			/* Default translation */
1929 1930 1931
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1932

1933
			if (ata_id_current_chs_valid(id)) {
1934
				/* Current CHS translation is valid. */
1935 1936 1937
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1938 1939 1940
			}

			/* print device info to dmesg */
1941
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1942
				ata_dev_printk(dev, KERN_INFO,
1943 1944 1945
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1946
				ata_dev_printk(dev, KERN_INFO,
1947 1948 1949 1950 1951
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1952 1953
		}

1954
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1955 1956 1957
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1958
	else if (dev->class == ATA_DEV_ATAPI) {
1959 1960
		char *cdb_intr_string = "";

1961
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1962
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1963
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1964 1965
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1966
			rc = -EINVAL;
L
Linus Torvalds 已提交
1967 1968
			goto err_out_nosup;
		}
1969
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1970

1971
		if (ata_id_cdb_intr(dev->id)) {
1972
			dev->flags |= ATA_DFLAG_CDB_INTR;
1973 1974
			cdb_intr_string = ", CDB intr";
		}
1975

L
Linus Torvalds 已提交
1976
		/* print device info to dmesg */
1977
		if (ata_msg_drv(ap) && print_info)
1978 1979 1980
			ata_dev_printk(dev, KERN_INFO,
				       "ATAPI: %s, %s, max %s%s\n",
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
1981 1982
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1983 1984
	}

1985 1986 1987 1988 1989
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
	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");
		}
	}

2002
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2003
	if (ata_dev_knobble(dev)) {
2004
		if (ata_msg_drv(ap) && print_info)
2005 2006
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2007
		dev->udma_mask &= ATA_UDMA5;
2008 2009 2010
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2011
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
2012 2013
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2014

2015
	if (ap->ops->dev_config)
2016
		ap->ops->dev_config(dev);
2017

2018 2019 2020
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2021
	return 0;
L
Linus Torvalds 已提交
2022 2023

err_out_nosup:
2024
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2025 2026
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2027
	return rc;
L
Linus Torvalds 已提交
2028 2029
}

A
Alan Cox 已提交
2030
/**
2031
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2032 2033
 *	@ap: port
 *
2034
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2035 2036 2037 2038 2039 2040 2041 2042 2043
 *	detection.
 */

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

/**
2044
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2045 2046
 *	@ap: port
 *
2047
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
 *	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
2080 2081 2082 2083
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2084 2085 2086 2087
 *	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
2088
 *	LOCKING:
J
Jeff Garzik 已提交
2089
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2090 2091
 *
 *	RETURNS:
2092
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2093 2094
 */

2095
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2096
{
2097
	unsigned int classes[ATA_MAX_DEVICES];
2098
	int tries[ATA_MAX_DEVICES];
2099
	int i, rc;
2100
	struct ata_device *dev;
L
Linus Torvalds 已提交
2101

2102
	ata_port_probe(ap);
2103

2104 2105 2106 2107
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
2108
	/* reset and determine device classes */
2109
	ap->ops->phy_reset(ap);
2110

2111 2112
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
2113

2114 2115 2116 2117 2118
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2119

2120
		dev->class = ATA_DEV_UNKNOWN;
2121
	}
L
Linus Torvalds 已提交
2122

2123
	ata_port_probe(ap);
2124

A
Alan Cox 已提交
2125 2126 2127 2128 2129 2130
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		ap->device[i].pio_mode = XFER_PIO_0;

2131 2132 2133 2134 2135
	/* 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 */

	for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
2136
		dev = &ap->device[i];
2137

2138 2139
		if (tries[i])
			dev->class = classes[i];
2140

2141
		if (!ata_dev_enabled(dev))
2142 2143
			continue;

2144 2145
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2146 2147
		if (rc)
			goto fail;
2148 2149
	}

A
Alan Cox 已提交
2150 2151 2152 2153
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

2154 2155 2156 2157 2158 2159 2160
	/* 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 */

	for(i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;
2161

2162 2163 2164
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2165 2166
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2167 2168
	}

2169
	/* configure transfer mode */
2170
	rc = ata_set_mode(ap, &dev);
2171
	if (rc)
2172
		goto fail;
L
Linus Torvalds 已提交
2173

2174 2175 2176
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
2177

2178 2179
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
2180
	ap->ops->port_disable(ap);
2181
	return -ENODEV;
2182 2183

 fail:
2184 2185
	tries[dev->devno]--;

2186 2187
	switch (rc) {
	case -EINVAL:
2188
		/* eeek, something went very wrong, give up */
2189 2190
		tries[dev->devno] = 0;
		break;
2191 2192 2193 2194

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2195
	case -EIO:
2196 2197 2198 2199 2200 2201 2202
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
			sata_down_spd_limit(ap);
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2203 2204
	}

2205
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2206
		ata_dev_disable(dev);
2207

2208
	goto retry;
L
Linus Torvalds 已提交
2209 2210 2211
}

/**
J
Jeff Garzik 已提交
2212 2213
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2214
 *
J
Jeff Garzik 已提交
2215 2216 2217
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2218
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2219
 *	serialization.
L
Linus Torvalds 已提交
2220 2221 2222 2223
 */

void ata_port_probe(struct ata_port *ap)
{
2224
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2225 2226
}

2227 2228 2229 2230 2231 2232 2233 2234 2235
/**
 *	sata_print_link_status - Print SATA link status
 *	@ap: SATA port to printk link status about
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2236
void sata_print_link_status(struct ata_port *ap)
2237
{
2238
	u32 sstatus, scontrol, tmp;
2239

2240
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2241
		return;
2242
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2243

2244
	if (ata_port_online(ap)) {
2245
		tmp = (sstatus >> 4) & 0xf;
2246 2247 2248
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2249
	} else {
2250 2251 2252
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2253 2254 2255
	}
}

L
Linus Torvalds 已提交
2256
/**
J
Jeff Garzik 已提交
2257 2258
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2259
 *
J
Jeff Garzik 已提交
2260 2261 2262
 *	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
2263 2264
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2265
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2266 2267 2268 2269 2270 2271 2272 2273
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2274
		/* issue phy wake/reset */
2275
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2276 2277 2278
		/* 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
2279
	}
2280 2281
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2282 2283 2284 2285

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2286
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2287 2288 2289 2290
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2291 2292
	/* print link status */
	sata_print_link_status(ap);
2293

2294
	/* TODO: phy layer with polling, timeouts, etc. */
2295
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2296
		ata_port_probe(ap);
2297
	else
L
Linus Torvalds 已提交
2298 2299
		ata_port_disable(ap);

2300
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
		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
2312 2313
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2314
 *
J
Jeff Garzik 已提交
2315 2316
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2317 2318
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2319
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2320 2321 2322 2323 2324
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2325
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2326 2327 2328 2329
		return;
	ata_bus_reset(ap);
}

2330 2331 2332 2333 2334 2335 2336
/**
 *	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
 */
2337

T
Tejun Heo 已提交
2338
struct ata_device *ata_dev_pair(struct ata_device *adev)
2339
{
T
Tejun Heo 已提交
2340
	struct ata_port *ap = adev->ap;
2341
	struct ata_device *pair = &ap->device[1 - adev->devno];
2342
	if (!ata_dev_enabled(pair))
2343 2344 2345 2346
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2347
/**
J
Jeff Garzik 已提交
2348 2349
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2350
 *
J
Jeff Garzik 已提交
2351 2352 2353 2354 2355
 *	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
2356
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2357
 *	serialization.
L
Linus Torvalds 已提交
2358 2359 2360 2361 2362 2363
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2364
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2365 2366
}

2367
/**
2368
 *	sata_down_spd_limit - adjust SATA spd limit downward
2369 2370 2371 2372
 *	@ap: Port to adjust SATA spd limit for
 *
 *	Adjust SATA spd limit of @ap downward.  Note that this
 *	function only adjusts the limit.  The change must be applied
2373
 *	using sata_set_spd().
2374 2375 2376 2377 2378 2379 2380
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2381
int sata_down_spd_limit(struct ata_port *ap)
2382
{
2383 2384
	u32 sstatus, spd, mask;
	int rc, highbit;
2385

2386 2387 2388
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2389 2390 2391 2392 2393 2394 2395

	mask = ap->sata_spd_limit;
	if (mask <= 1)
		return -EINVAL;
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2396
	spd = (sstatus >> 4) & 0xf;
2397 2398 2399 2400 2401 2402 2403 2404 2405
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2406 2407
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2408 2409 2410 2411

	return 0;
}

2412
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427
{
	u32 spd, limit;

	if (ap->sata_spd_limit == UINT_MAX)
		limit = 0;
	else
		limit = fls(ap->sata_spd_limit);

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

	return spd != limit;
}

/**
2428
 *	sata_set_spd_needed - is SATA spd configuration needed
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441
 *	@ap: Port in question
 *
 *	Test whether the spd limit in SControl matches
 *	@ap->sata_spd_limit.  This function is used to determine
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2442
int sata_set_spd_needed(struct ata_port *ap)
2443 2444 2445
{
	u32 scontrol;

2446
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2447 2448
		return 0;

2449
	return __sata_set_spd_needed(ap, &scontrol);
2450 2451 2452
}

/**
2453
 *	sata_set_spd - set SATA spd according to spd limit
2454 2455 2456 2457 2458 2459 2460 2461 2462
 *	@ap: Port to set SATA spd for
 *
 *	Set SATA spd of @ap according to sata_spd_limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2463
 *	changed.  Negative errno if SCR registers are inaccessible.
2464
 */
2465
int sata_set_spd(struct ata_port *ap)
2466 2467
{
	u32 scontrol;
2468
	int rc;
2469

2470 2471
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2472

2473
	if (!__sata_set_spd_needed(ap, &scontrol))
2474 2475
		return 0;

2476 2477 2478
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2479 2480 2481
	return 1;
}

A
Alan Cox 已提交
2482 2483 2484 2485 2486
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2487
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2488
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2489 2490 2491
 * 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
2492 2493 2494 2495 2496 2497 2498 2499 2500
 */

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 },

2501 2502
	{ 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
2503 2504 2505 2506 2507
	{ 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 }, */
2508

A
Alan Cox 已提交
2509 2510 2511
	{ 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 },
2512

A
Alan Cox 已提交
2513 2514 2515 2516
	{ 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 },

2517 2518
	{ 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
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563
	{ 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
2564
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2565
			return NULL;
2566
	return t;
A
Alan Cox 已提交
2567 2568 2569 2570 2571 2572 2573 2574 2575
}

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;

	/*
2576
	 * Find the mode.
2577
	 */
A
Alan Cox 已提交
2578 2579 2580 2581

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

2582 2583
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603
	/*
	 * 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.
	 */

2604
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2605 2606

	/*
2607 2608 2609
	 * 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
2610 2611
	 */

2612
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2613 2614 2615 2616 2617
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2618
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629
	 */

	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
2630

2631 2632 2633 2634 2635
	/* 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
2636 2637 2638 2639

	return 0;
}

2640 2641 2642
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2643
 *	@sel: ATA_DNXFER_* selector
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654
 *
 *	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
 */
2655
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2656
{
2657 2658 2659 2660
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2661

2662 2663
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2664

2665 2666 2667 2668
	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);
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 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721
	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);
	}
2722 2723 2724 2725 2726 2727 2728

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

	return 0;
}

T
Tejun Heo 已提交
2729
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2730
{
2731
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2732 2733
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2734

2735
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2736 2737 2738
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2739
	err_mask = ata_dev_set_xfermode(dev);
2740 2741 2742 2743
	/* 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;

2744
	if (err_mask) {
2745 2746
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2747 2748
		return -EIO;
	}
L
Linus Torvalds 已提交
2749

2750
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2751
	rc = ata_dev_revalidate(dev, 0);
2752
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2753
	if (rc)
2754
		return rc;
2755

2756 2757
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2758

2759 2760
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2761
	return 0;
L
Linus Torvalds 已提交
2762 2763 2764
}

/**
2765
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
L
Linus Torvalds 已提交
2766
 *	@ap: port on which timings will be programmed
2767
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2768
 *
2769 2770 2771
 *	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
2772
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2773
 *
L
Linus Torvalds 已提交
2774
 *	LOCKING:
J
Jeff Garzik 已提交
2775
 *	PCI/etc. bus probe sem.
2776 2777 2778
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2779
 */
2780 2781

int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2782
{
2783
	struct ata_device *dev;
2784
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2785

2786

2787 2788
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2789
		unsigned int pio_mask, dma_mask;
2790

2791 2792
		dev = &ap->device[i];

2793
		if (!ata_dev_enabled(dev))
2794 2795
			continue;

T
Tejun Heo 已提交
2796
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2797

2798 2799 2800 2801
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2802

2803
		found = 1;
2804 2805
		if (dev->dma_mode)
			used_dma = 1;
2806
	}
2807
	if (!found)
2808
		goto out;
2809 2810

	/* step 2: always set host PIO timings */
2811 2812 2813 2814 2815 2816
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2817
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2818
			rc = -EINVAL;
2819
			goto out;
2820 2821 2822 2823 2824 2825 2826
		}

		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
2827

2828
	/* step 3: set host DMA timings */
2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];

		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
2840 2841

	/* step 4: update devices' xfer mode */
2842
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2843
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2844

A
Alan 已提交
2845
		/* don't update suspended devices' xfer mode */
2846
		if (!ata_dev_enabled(dev))
2847 2848
			continue;

T
Tejun Heo 已提交
2849
		rc = ata_dev_set_mode(dev);
2850
		if (rc)
2851
			goto out;
2852
	}
L
Linus Torvalds 已提交
2853

2854 2855
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2856
	 */
J
Jeff Garzik 已提交
2857
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2858
		ap->host->simplex_claimed = ap;
2859

2860 2861 2862 2863
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2864 2865
}

2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
 *	@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
 */
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
{
	/* has private set_mode? */
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
	return ata_do_set_mode(ap, r_failed_dev);
}

2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
/**
 *	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
2899
 *	spin_lock_irqsave(host lock)
2900 2901 2902 2903 2904 2905 2906 2907 2908
 */

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
2909 2910 2911 2912 2913 2914
/**
 *	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
2915 2916 2917
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2918 2919 2920 2921 2922
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2923
 */
2924 2925
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2926 2927 2928 2929 2930 2931 2932
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2933 2934
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2935 2936 2937 2938
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2939
	if (status != 0xff && (status & ATA_BUSY))
2940
		ata_port_printk(ap, KERN_WARNING,
2941 2942
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2943 2944

	timeout = timer_start + tmout;
2945 2946
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2947 2948 2949 2950
		msleep(50);
		status = ata_chk_status(ap);
	}

2951 2952 2953
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2954
	if (status & ATA_BUSY) {
2955
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2956 2957
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2958
		return -EBUSY;
L
Linus Torvalds 已提交
2959 2960 2961 2962 2963
	}

	return 0;
}

2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988
/**
 *	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;
2989
		if (!ata_port_online(ap) && status == 0xff)
2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007
			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
3008 3009 3010 3011
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3012
	int rc, ret = 0;
L
Linus Torvalds 已提交
3013 3014 3015 3016

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3017 3018
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3019 3020 3021 3022 3023
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3024
	}
L
Linus Torvalds 已提交
3025

3026 3027
	/* 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
3028
	 */
3029 3030
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3031 3032

		ap->ops->dev_select(ap, 1);
3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047

		/* 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 */
		}

3048
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3049 3050 3051 3052 3053
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3054
	}
L
Linus Torvalds 已提交
3055 3056 3057 3058 3059 3060 3061

	/* 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);
3062

T
Tejun Heo 已提交
3063
	return ret;
L
Linus Torvalds 已提交
3064 3065
}

3066 3067
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3068 3069 3070
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3071
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3072 3073

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3074 3075 3076 3077 3078
	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
3079 3080 3081 3082 3083 3084 3085 3086

	/* 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.
3087 3088
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3089 3090 3091
	 */
	msleep(150);

3092
	/* Before we perform post reset processing we want to see if
3093 3094 3095
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3096
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3097
		return -ENODEV;
3098

3099
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114
}

/**
 *	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
3115
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3116
 *	Obtains host lock.
L
Linus Torvalds 已提交
3117 3118
 *
 *	SIDE EFFECTS:
3119
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3120 3121 3122 3123 3124 3125 3126
 */

void ata_bus_reset(struct ata_port *ap)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3127
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3128
	int rc;
L
Linus Torvalds 已提交
3129

T
Tejun Heo 已提交
3130
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149

	/* 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
3150 3151 3152
	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
3153
			goto err_out;
T
Tejun Heo 已提交
3154
	}
L
Linus Torvalds 已提交
3155 3156 3157 3158

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3159
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
3160
	if ((slave_possible) && (err != 0x81))
3161
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
3162 3163

	/* re-enable interrupts */
3164
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178

	/* is double-select really necessary? */
	if (ap->device[1].class != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 1);
	if (ap->device[0].class != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
	if ((ap->device[0].class == ATA_DEV_NONE) &&
	    (ap->device[1].class == ATA_DEV_NONE))
		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
3179
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3180 3181 3182 3183 3184 3185
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3186
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
3187 3188 3189 3190 3191
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

3192 3193 3194 3195
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3196
 *	@deadline: deadline jiffies for the operation
3197 3198 3199 3200
 *
 *	Make sure SStatus of @ap reaches stable state, determined by
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3201 3202
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3203 3204
 *	until timeout then returns 0 if DET is stable at 1.
 *
3205 3206 3207
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3208 3209 3210 3211 3212 3213
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3214 3215
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
		      unsigned long deadline)
3216
{
3217
	unsigned long interval_msec = params[0];
3218 3219
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3220 3221 3222
	u32 last, cur;
	int rc;

3223 3224 3225 3226
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
	if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
		if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3242
			if (cur == 1 && time_before(jiffies, deadline))
3243 3244 3245 3246 3247 3248 3249 3250 3251 3252
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3253 3254
		/* check deadline */
		if (time_after(jiffies, deadline))
3255 3256 3257 3258 3259 3260 3261 3262
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3263
 *	@deadline: deadline jiffies for the operation
3264 3265 3266 3267 3268 3269 3270 3271 3272
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3273 3274
int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
		    unsigned long deadline)
3275 3276
{
	u32 scontrol;
3277 3278 3279 3280
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
3281

3282
	scontrol = (scontrol & 0x0f0) | 0x300;
3283 3284 3285

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
3286

3287 3288 3289 3290
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3291

3292
	return sata_phy_debounce(ap, params, deadline);
3293 3294
}

3295 3296 3297
/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
3298
 *	@deadline: deadline jiffies for the operation
3299
 *
T
Tejun Heo 已提交
3300 3301 3302 3303 3304
 *	@ap is about to be reset.  Initialize it.  Failure from
 *	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.
3305 3306 3307 3308 3309 3310 3311
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3312
int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
3313 3314
{
	struct ata_eh_context *ehc = &ap->eh_context;
3315
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3316 3317
	int rc;

T
Tejun Heo 已提交
3318
	/* handle link resume */
3319 3320 3321 3322
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

3323 3324 3325 3326 3327
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

	/* if SATA, resume phy */
3328
	if (ap->flags & ATA_FLAG_SATA) {
3329
		rc = sata_phy_resume(ap, timing, deadline);
T
Tejun Heo 已提交
3330 3331
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3332 3333 3334 3335 3336 3337 3338
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"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.
	 */
T
Tejun Heo 已提交
3339 3340
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
		rc = ata_wait_ready(ap, deadline);
3341
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3342 3343 3344 3345 3346
			ata_port_printk(ap, KERN_WARNING, "device not ready "
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3347 3348 3349 3350

	return 0;
}

3351 3352 3353 3354
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
3355
 *	@deadline: deadline jiffies for the operation
3356
 *
3357
 *	Reset host port using ATA SRST.
3358 3359 3360 3361 3362 3363 3364
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3365 3366
int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
		      unsigned long deadline)
3367 3368
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3369 3370
	unsigned int devmask = 0;
	int rc;
3371 3372 3373 3374
	u8 err;

	DPRINTK("ENTER\n");

3375
	if (ata_port_offline(ap)) {
3376 3377 3378 3379
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390
	/* 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);
3391
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3392 3393
	/* if link is occupied, -ENODEV too is an error */
	if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
3394 3395
		ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
		return rc;
3396 3397 3398 3399 3400 3401 3402
	}

	/* determine by signature whether we have ATA or ATAPI devices */
	classes[0] = ata_dev_try_classify(ap, 0, &err);
	if (slave_possible && err != 0x81)
		classes[1] = ata_dev_try_classify(ap, 1, &err);

3403
 out:
3404 3405 3406 3407 3408
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3409
 *	sata_port_hardreset - reset port via SATA phy reset
3410
 *	@ap: port to reset
3411
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3412
 *	@deadline: deadline jiffies for the operation
3413 3414 3415 3416 3417 3418 3419 3420 3421
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3422 3423
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
			unsigned long deadline)
3424
{
3425
	u32 scontrol;
3426
	int rc;
3427

3428 3429
	DPRINTK("ENTER\n");

3430
	if (sata_set_spd_needed(ap)) {
3431 3432 3433 3434 3435
		/* 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.
		 */
3436
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3437
			goto out;
3438

3439
		scontrol = (scontrol & 0x0f0) | 0x304;
3440 3441

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3442
			goto out;
3443

3444
		sata_set_spd(ap);
3445 3446 3447
	}

	/* issue phy wake/reset */
3448
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3449
		goto out;
3450

3451
	scontrol = (scontrol & 0x0f0) | 0x301;
3452 3453

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3454
		goto out;
3455

3456
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3457 3458 3459 3460
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3461
	/* bring phy back */
3462
	rc = sata_phy_resume(ap, timing, deadline);
3463 3464 3465 3466 3467 3468 3469 3470 3471
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
 *	@ap: port to reset
 *	@class: resulting class of attached device
3472
 *	@deadline: deadline jiffies for the operation
3473 3474 3475 3476 3477 3478 3479 3480 3481 3482
 *
 *	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.
 */
3483 3484
int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
		       unsigned long deadline)
3485 3486 3487 3488 3489 3490 3491
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
3492
	rc = sata_port_hardreset(ap, timing, deadline);
3493 3494 3495 3496 3497
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3498 3499

	/* TODO: phy layer with polling, timeouts, etc. */
3500
	if (ata_port_offline(ap)) {
3501 3502 3503 3504 3505
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3506 3507 3508
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3509
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3510 3511
	/* link occupied, -ENODEV too is an error */
	if (rc) {
3512
		ata_port_printk(ap, KERN_ERR,
3513 3514
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3515 3516
	}

3517 3518
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538
	*class = ata_dev_try_classify(ap, 0, NULL);

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

/**
 *	ata_std_postreset - standard postreset callback
 *	@ap: the target ata_port
 *	@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)
 */
void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
{
3539 3540
	u32 serror;

3541 3542 3543
	DPRINTK("ENTER\n");

	/* print link status */
3544
	sata_print_link_status(ap);
3545

3546 3547 3548 3549
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3550
	/* re-enable interrupts */
3551 3552
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3553 3554 3555 3556 3557 3558 3559

	/* 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);

3560 3561 3562 3563 3564 3565 3566
	/* 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
3567 3568
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3569 3570 3571 3572

	DPRINTK("EXIT\n");
}

3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588
/**
 *	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
3589 3590
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3591 3592
{
	const u16 *old_id = dev->id;
3593 3594
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3595 3596

	if (dev->class != new_class) {
3597 3598
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3599 3600 3601
		return 0;
	}

3602 3603 3604 3605
	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]));
3606 3607

	if (strcmp(model[0], model[1])) {
3608 3609
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3610 3611 3612 3613
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3614 3615
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3616 3617 3618 3619 3620 3621 3622
		return 0;
	}

	return 1;
}

/**
3623
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3624
 *	@dev: target ATA device
3625
 *	@readid_flags: read ID flags
3626 3627 3628 3629 3630 3631 3632 3633 3634 3635
 *
 *	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
 */
3636
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3637
{
3638
	unsigned int class = dev->class;
3639
	u16 *id = (void *)dev->ap->sector_buf;
3640 3641
	int rc;

3642
	/* read ID data */
3643
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3644
	if (rc)
3645
		return rc;
3646 3647

	/* is the device still there? */
3648 3649
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3650

3651
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
 *	@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
 */
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
{
3671
	u64 n_sectors = dev->n_sectors;
3672 3673 3674 3675 3676 3677 3678 3679 3680
	int rc;

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

	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3681 3682

	/* configure device according to the new ID */
3683
	rc = ata_dev_configure(dev);
3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
	if (dev->class == ATA_DEV_ATA && dev->n_sectors != n_sectors) {
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3698 3699

 fail:
3700
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3701 3702 3703
	return rc;
}

3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740
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 },
3741
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3742
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3743

3744
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3745
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3746

3747 3748 3749 3750 3751
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3752 3753
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3754 3755
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3756
	{ "Maxtor 6B200M0",	"BANC1B10",	ATA_HORKAGE_NONCQ },
3757 3758
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3759 3760 3761 3762 3763
	/* 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, },
3764 3765
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3766
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3767
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3768
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3769 3770 3771 3772 3773

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3774
};
3775

3776
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3777
{
T
Tejun Heo 已提交
3778 3779
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3780
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3781

T
Tejun Heo 已提交
3782 3783
	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
3784

3785
	while (ad->model_num) {
T
Tejun Heo 已提交
3786
		if (!strcmp(ad->model_num, model_num)) {
3787 3788
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3789
			if (!strcmp(ad->model_rev, model_rev))
3790
				return ad->horkage;
3791
		}
3792
		ad++;
3793
	}
L
Linus Torvalds 已提交
3794 3795 3796
	return 0;
}

3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808
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.
	 */
	if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
	return (ata_device_blacklisted(dev) & ATA_HORKAGE_NODMA) ? 1 : 0;
}

3809 3810 3811 3812
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3813 3814 3815 3816
 *	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...
3817 3818 3819 3820
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3821
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3822
{
T
Tejun Heo 已提交
3823
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3824
	struct ata_host *host = ap->host;
3825
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3826

3827
	/* controller modes available */
3828 3829 3830
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3831
	/* drive modes available */
3832 3833 3834
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3835

3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846
	/*
	 *	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));
	}

3847 3848
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3849 3850
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3851
	}
3852

3853 3854
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3855 3856 3857
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3858
	}
3859

J
Jeff Garzik 已提交
3860 3861 3862
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

3863
	if (ap->ops->mode_filter)
3864
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3865

3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884
	/* 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);
		}

3885 3886
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3887 3888 3889 3890 3891 3892
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3893 3894 3895
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3896
 *	LOCKING:
J
Jeff Garzik 已提交
3897
 *	PCI/etc. bus probe sem.
3898 3899 3900
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3901 3902
 */

T
Tejun Heo 已提交
3903
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3904
{
3905
	struct ata_taskfile tf;
3906
	unsigned int err_mask;
L
Linus Torvalds 已提交
3907 3908 3909 3910

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

T
Tejun Heo 已提交
3911 3912 3913
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
3914
	ata_tf_init(dev, &tf);
3915 3916
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
3917
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
3918 3919
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3920

T
Tejun Heo 已提交
3921
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3922

3923 3924
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3925 3926
}

3927 3928 3929
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3930 3931
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3932 3933
 *
 *	LOCKING:
3934 3935 3936 3937
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3938
 */
T
Tejun Heo 已提交
3939 3940
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3941
{
3942
	struct ata_taskfile tf;
3943
	unsigned int err_mask;
3944 3945 3946

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3947
		return AC_ERR_INVALID;
3948 3949 3950 3951

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

T
Tejun Heo 已提交
3952
	ata_tf_init(dev, &tf);
3953 3954 3955 3956 3957
	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 */
3958

T
Tejun Heo 已提交
3959
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3960

3961 3962
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3963 3964
}

L
Linus Torvalds 已提交
3965
/**
J
Jeff Garzik 已提交
3966 3967 3968 3969
 *	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
3970 3971
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3972
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3973
 */
3974
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3975 3976
{
	struct ata_port *ap = qc->ap;
3977
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3978
	int dir = qc->dma_dir;
3979
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3980

3981 3982
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3983 3984

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3985
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3986

J
Jeff Garzik 已提交
3987
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3988

3989 3990 3991 3992 3993 3994 3995 3996
	/* 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) {
3997
		if (qc->n_elem)
3998
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3999 4000 4001 4002 4003 4004
		/* restore last sg */
		sg[qc->orig_n_elem - 1].length += qc->pad_len;
		if (pad_buf) {
			struct scatterlist *psg = &qc->pad_sgent;
			void *addr = kmap_atomic(psg->page, KM_IRQ0);
			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4005
			kunmap_atomic(addr, KM_IRQ0);
4006 4007
		}
	} else {
4008
		if (qc->n_elem)
4009
			dma_unmap_single(ap->dev,
4010 4011
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4012 4013 4014 4015 4016 4017
		/* 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
4018 4019

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4020
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4021 4022 4023 4024 4025 4026
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4027 4028 4029
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4030
 *	LOCKING:
J
Jeff Garzik 已提交
4031
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4032 4033 4034 4035 4036
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4037 4038
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4039

4040
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4041
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4042 4043

	idx = 0;
4044
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073
		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);
}
4074

4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136
/**
 *	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
4137 4138 4139 4140
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4141 4142 4143 4144
 *	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
4145
 *	LOCKING:
J
Jeff Garzik 已提交
4146
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4147
 *
L
Linus Torvalds 已提交
4148 4149 4150 4151 4152 4153
 *	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;
4154 4155 4156 4157 4158 4159

	/* 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;
4160

L
Linus Torvalds 已提交
4161
	if (ap->ops->check_atapi_dma)
4162
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4163

4164
	return 0;
L
Linus Torvalds 已提交
4165
}
4166

L
Linus Torvalds 已提交
4167 4168 4169 4170
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4171 4172
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4173
 *	LOCKING:
J
Jeff Garzik 已提交
4174
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4175 4176 4177 4178 4179 4180 4181 4182 4183
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200
/**
 *	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);
}

4201 4202
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4203 4204 4205 4206 4207 4208 4209 4210 4211 4212
/**
 *	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
4213
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4214 4215
 */

L
Linus Torvalds 已提交
4216 4217 4218 4219
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4220
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4221
	qc->n_elem = 1;
4222
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4223
	qc->buf_virt = buf;
4224
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4225

4226
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4227 4228
}

J
Jeff Garzik 已提交
4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239
/**
 *	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
4240
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4241 4242
 */

L
Linus Torvalds 已提交
4243 4244 4245 4246
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4247
	qc->__sg = sg;
L
Linus Torvalds 已提交
4248
	qc->n_elem = n_elem;
4249
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4250 4251 4252
}

/**
J
Jeff Garzik 已提交
4253 4254 4255 4256
 *	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
4257 4258
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4259
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4260 4261
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4262
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4263 4264 4265 4266 4267 4268
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4269
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4270
	dma_addr_t dma_address;
4271
	int trim_sg = 0;
L
Linus Torvalds 已提交
4272

4273 4274 4275 4276 4277 4278
	/* 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;

4279
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290

		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;
4291 4292
		if (sg->length == 0)
			trim_sg = 1;
4293 4294 4295 4296 4297

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

4298 4299
	if (trim_sg) {
		qc->n_elem--;
4300 4301 4302
		goto skip_map;
	}

4303
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4304
				     sg->length, dir);
4305 4306 4307
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4308
		return -1;
4309
	}
L
Linus Torvalds 已提交
4310 4311

	sg_dma_address(sg) = dma_address;
4312
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4313

4314
skip_map:
L
Linus Torvalds 已提交
4315 4316 4317 4318 4319 4320 4321
	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
4322 4323 4324 4325
 *	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
4326 4327
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4328
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4329 4330
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4331
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4332 4333 4334 4335 4336 4337
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4338 4339
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4340
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4341

T
Tejun Heo 已提交
4342
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4343
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4344

4345 4346 4347 4348 4349 4350 4351
	/* 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;

4352
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366

		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;
		psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
		psg->offset = offset_in_page(offset);

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			void *addr = kmap_atomic(psg->page, KM_IRQ0);
			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4367
			kunmap_atomic(addr, KM_IRQ0);
4368 4369 4370 4371 4372 4373
		}

		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;
4374 4375
		if (lsg->length == 0)
			trim_sg = 1;
4376 4377 4378 4379 4380

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

4381 4382 4383 4384 4385 4386 4387 4388 4389
	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
4390
	dir = qc->dma_dir;
4391
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4392 4393 4394
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4395
		return -1;
4396
	}
L
Linus Torvalds 已提交
4397 4398 4399

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

4400
skip_map:
L
Linus Torvalds 已提交
4401 4402 4403 4404 4405
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4406
/**
4407
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4408 4409 4410 4411 4412 4413 4414 4415
 *	@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
4416
 *	Inherited from caller.
E
Edward Falk 已提交
4417
 */
L
Linus Torvalds 已提交
4418 4419 4420 4421 4422 4423 4424 4425 4426 4427
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
4428
/**
T
Tejun Heo 已提交
4429
 *	ata_data_xfer - Transfer data by PIO
4430
 *	@adev: device to target
A
Albert Lee 已提交
4431 4432
 *	@buf: data buffer
 *	@buflen: buffer length
4433
 *	@write_data: read/write
A
Albert Lee 已提交
4434 4435 4436 4437 4438 4439
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4440 4441
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4442
{
4443
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4444
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4445

A
Albert Lee 已提交
4446
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4447
	if (write_data)
T
Tejun Heo 已提交
4448
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4449
	else
T
Tejun Heo 已提交
4450
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4451 4452 4453 4454 4455 4456 4457 4458

	/* 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
4459
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4460
		} else {
T
Tejun Heo 已提交
4461
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4462 4463 4464
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4465 4466
}

4467
/**
T
Tejun Heo 已提交
4468
 *	ata_data_xfer_noirq - Transfer data by PIO
4469 4470 4471 4472 4473
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4474
 *	Transfer data from/to the device data register by PIO. Do the
4475 4476 4477 4478 4479
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4480 4481
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4482 4483 4484
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4485
	ata_data_xfer(adev, buf, buflen, write_data);
4486 4487 4488 4489
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4490
/**
4491
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4492 4493
 *	@qc: Command on going
 *
4494
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4495 4496 4497 4498 4499
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4500 4501 4502
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4503
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4504 4505 4506 4507 4508
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4509
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4510
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4511 4512

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4513
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4514 4515 4516 4517 4518 4519 4520

	/* 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");

4521 4522 4523
	if (PageHighMem(page)) {
		unsigned long flags;

4524
		/* FIXME: use a bounce buffer */
4525 4526
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4527

4528
		/* do the actual data transfer */
4529
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4530

4531 4532 4533 4534
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4535
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4536
	}
L
Linus Torvalds 已提交
4537

4538 4539
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4540

T
Tejun Heo 已提交
4541
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4542 4543 4544 4545 4546
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4547
/**
4548
 *	ata_pio_sectors - Transfer one or many sectors.
4549 4550
 *	@qc: Command on going
 *
4551
 *	Transfer one or many sectors of data from/to the
4552 4553 4554 4555 4556
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4557

4558 4559 4560 4561 4562 4563
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
4564
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4565

4566
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4567
			    qc->dev->multi_count);
4568 4569 4570 4571 4572 4573
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589
/**
 *	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");
4590
	WARN_ON(qc->dev->cdb_len < 12);
4591

4592
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607
	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
4608 4609
}

A
Albert Lee 已提交
4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621
/**
 *	__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
4622 4623 4624
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4625
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4626 4627 4628 4629 4630
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4631
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4632
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4633 4634

next_sg:
4635
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4636
		/*
4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647
		 * 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 */
4648 4649
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4650 4651

		for (i = 0; i < words; i++)
4652
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4653

A
Albert Lee 已提交
4654
		ap->hsm_task_state = HSM_ST_LAST;
4655 4656 4657
		return;
	}

4658
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4659 4660 4661 4662 4663 4664 4665 4666

	page = sg->page;
	offset = sg->offset + qc->cursg_ofs;

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

4667
	/* don't overrun current sg */
4668
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4669 4670 4671 4672

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

4673 4674
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4675 4676 4677
	if (PageHighMem(page)) {
		unsigned long flags;

4678
		/* FIXME: use bounce buffer */
4679 4680
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4681

4682
		/* do the actual data transfer */
4683
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4684

4685 4686 4687 4688
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4689
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4690
	}
L
Linus Torvalds 已提交
4691 4692 4693 4694 4695

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

4696
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4697 4698 4699 4700
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4701
	if (bytes)
L
Linus Torvalds 已提交
4702 4703 4704
		goto next_sg;
}

A
Albert Lee 已提交
4705 4706 4707 4708 4709 4710 4711 4712 4713 4714
/**
 *	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
4715 4716 4717 4718 4719 4720 4721
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;

4722 4723 4724 4725 4726 4727 4728 4729 4730 4731
	/* 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
4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742
	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
4743
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4744

L
Linus Torvalds 已提交
4745 4746 4747 4748 4749
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4750
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4751
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4752
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4753 4754 4755
}

/**
4756 4757 4758
 *	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
4759
 *
4760 4761
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4762
 */
4763 4764

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4765
{
4766 4767
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4768

4769 4770 4771 4772
	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
4773

4774 4775 4776
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4777 4778
	}

4779 4780
	return 0;
}
L
Linus Torvalds 已提交
4781

T
Tejun Heo 已提交
4782 4783 4784 4785 4786 4787 4788 4789
/**
 *	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
4790
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4791 4792 4793 4794 4795 4796 4797 4798 4799
 *	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) {
4800
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4801

J
Jeff Garzik 已提交
4802 4803
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4804 4805 4806 4807
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4808
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4809 4810 4811 4812 4813
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4814
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4815 4816 4817 4818 4819 4820 4821 4822
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4823
			spin_lock_irqsave(ap->lock, flags);
4824
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4825
			ata_qc_complete(qc);
4826
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4827 4828 4829 4830 4831
		} else
			ata_qc_complete(qc);
	}
}

4832 4833 4834 4835 4836 4837 4838 4839 4840 4841
/**
 *	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.
 */
4842 4843
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4844
{
4845 4846 4847
	unsigned long flags = 0;
	int poll_next;

4848 4849
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4850 4851 4852 4853
	/* 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).
	 */
4854
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4855

4856
fsm_start:
4857
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4858
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4859

4860 4861
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4862 4863 4864 4865 4866 4867 4868 4869
		/* 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);

4870
		/* check device status */
4871 4872 4873 4874 4875 4876 4877 4878 4879
		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
4880
			ap->hsm_task_state = HSM_ST_ERR;
4881
			goto fsm_start;
L
Linus Torvalds 已提交
4882 4883
		}

4884 4885
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4886 4887 4888
		 * 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.
4889 4890
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4891 4892
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4893
			qc->err_mask |= AC_ERR_HSM;
4894 4895
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4896
		}
L
Linus Torvalds 已提交
4897

4898 4899 4900 4901 4902 4903
		/* 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)
4904
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4905

4906 4907 4908 4909
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4910

4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922
			/* 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);
			ata_altstatus(ap); /* flush */
		} else
			/* send CDB */
			atapi_send_cdb(ap, qc);

		if (in_wq)
4923
			spin_unlock_irqrestore(ap->lock, flags);
4924 4925 4926 4927

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4928
		break;
4929

4930 4931 4932 4933 4934
	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) {
4935 4936 4937
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4938 4939 4940
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4941

4942 4943
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4944 4945 4946
			 * 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.
4947 4948
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4949 4950 4951
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4952
				qc->err_mask |= AC_ERR_HSM;
4953 4954
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4955
			}
L
Linus Torvalds 已提交
4956

4957
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4958

4959 4960 4961
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4962

4963 4964 4965 4966
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4967 4968 4969 4970
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4971 4972 4973 4974 4975 4976
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4977

4978 4979 4980
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4981

4982 4983 4984 4985 4986 4987 4988 4989 4990
			/* 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.
4991 4992 4993 4994
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4995 4996 4997 4998 4999 5000 5001

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

5002 5003 5004
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5005 5006 5007 5008 5009 5010
				/* 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;
5011 5012
			}

5013 5014 5015 5016 5017 5018
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
5019
				status = ata_wait_idle(ap);
5020 5021 5022 5023 5024
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
5025
		poll_next = 1;
L
Linus Torvalds 已提交
5026 5027
		break;

A
Albert Lee 已提交
5028
	case HSM_ST_LAST:
5029 5030
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5031 5032 5033 5034 5035
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5036
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5037
			ap->print_id, qc->dev->devno, status);
5038

5039 5040
		WARN_ON(qc->err_mask);

5041
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5042

5043
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5044
		ata_hsm_qc_complete(qc, in_wq);
5045 5046

		poll_next = 0;
L
Linus Torvalds 已提交
5047 5048
		break;

A
Albert Lee 已提交
5049
	case HSM_ST_ERR:
5050 5051 5052 5053 5054 5055
		/* 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;
5056

5057
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5058
		ata_hsm_qc_complete(qc, in_wq);
5059 5060

		poll_next = 0;
5061 5062
		break;
	default:
5063
		poll_next = 0;
5064
		BUG();
L
Linus Torvalds 已提交
5065 5066
	}

5067
	return poll_next;
L
Linus Torvalds 已提交
5068 5069
}

5070
static void ata_pio_task(struct work_struct *work)
5071
{
5072 5073 5074
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5075
	u8 status;
5076
	int poll_next;
5077

J
Jeff Garzik 已提交
5078
fsm_start:
5079
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5080

5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092
	/*
	 * 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) {
5093
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5094 5095
			return;
		}
5096 5097
	}

5098 5099
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5100

5101 5102 5103 5104
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5105
		goto fsm_start;
5106 5107
}

L
Linus Torvalds 已提交
5108 5109 5110 5111 5112 5113
/**
 *	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
5114
 *	None.
L
Linus Torvalds 已提交
5115 5116 5117 5118 5119 5120 5121
 */

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

5122
	/* no command while frozen */
5123
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5124 5125
		return NULL;

5126 5127
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5128
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5129
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143
			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
5144
 *	None.
L
Linus Torvalds 已提交
5145 5146
 */

T
Tejun Heo 已提交
5147
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5148
{
T
Tejun Heo 已提交
5149
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
5150 5151 5152 5153 5154 5155 5156 5157
	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
5158
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171
	}

	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
5172
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5173 5174 5175
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5176 5177 5178
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5179
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5180

5181 5182 5183 5184
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5185
		clear_bit(tag, &ap->qc_allocated);
5186
	}
L
Linus Torvalds 已提交
5187 5188
}

5189
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5190
{
5191 5192
	struct ata_port *ap = qc->ap;

5193 5194
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5195 5196 5197 5198

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

5199
	/* command should be marked inactive atomically with qc completion */
5200 5201 5202 5203
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
5204

5205 5206 5207 5208 5209
	/* 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;
5210
	ap->qc_active &= ~(1 << qc->tag);
5211

L
Linus Torvalds 已提交
5212
	/* call completion callback */
5213
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5214 5215
}

5216 5217 5218 5219 5220
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5221
	ap->ops->tf_read(ap, &qc->result_tf);
5222 5223
}

5224 5225 5226 5227 5228 5229 5230 5231 5232
/**
 *	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
5233
 *	spin_lock_irqsave(host lock)
5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252
 */
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) {
5253
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5254 5255 5256 5257 5258 5259 5260

		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 */
5261
				fill_result_tf(qc);
5262 5263 5264 5265 5266 5267 5268
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5269
			fill_result_tf(qc);
5270 5271 5272 5273 5274 5275 5276 5277

		__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)
5278
			fill_result_tf(qc);
5279 5280 5281 5282 5283

		__ata_qc_complete(qc);
	}
}

5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295
/**
 *	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
5296
 *	spin_lock_irqsave(host lock)
5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332
 *
 *	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
5333 5334 5335 5336 5337
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5338
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366
	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
5367
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5368
 */
5369
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5370 5371 5372
{
	struct ata_port *ap = qc->ap;

5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386
	/* 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.
	 */
	WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));

	if (qc->tf.protocol == ATA_PROT_NCQ) {
		WARN_ON(ap->sactive & (1 << qc->tag));
		ap->sactive |= 1 << qc->tag;
	} else {
		WARN_ON(ap->sactive);
		ap->active_tag = qc->tag;
	}

5387
	qc->flags |= ATA_QCFLAG_ACTIVE;
5388
	ap->qc_active |= 1 << qc->tag;
5389

L
Linus Torvalds 已提交
5390 5391 5392
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5393
				goto sg_err;
L
Linus Torvalds 已提交
5394 5395
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5396
				goto sg_err;
L
Linus Torvalds 已提交
5397 5398 5399 5400 5401 5402 5403
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5404 5405 5406 5407
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5408

5409 5410
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5411 5412 5413
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424
}

/**
 *	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
5425 5426
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5427
 *	LOCKING:
J
Jeff Garzik 已提交
5428
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5429 5430
 *
 *	RETURNS:
5431
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5432 5433
 */

5434
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5435 5436 5437
{
	struct ata_port *ap = qc->ap;

5438 5439 5440 5441 5442 5443
	/* 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:
5444
		case ATA_PROT_NODATA:
5445 5446 5447 5448 5449 5450
		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)
5451
				/* see ata_dma_blacklisted() */
5452 5453 5454 5455 5456 5457 5458
				BUG();
			break;
		default:
			break;
		}
	}

5459
	/* select the device */
L
Linus Torvalds 已提交
5460 5461
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5462
	/* start the command */
L
Linus Torvalds 已提交
5463 5464
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5465 5466 5467
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5468
		ata_tf_to_host(ap, &qc->tf);
5469 5470 5471
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5472
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5473

L
Linus Torvalds 已提交
5474 5475 5476
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5477
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5478

L
Linus Torvalds 已提交
5479 5480 5481
		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 */
5482
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5483 5484
		break;

5485 5486 5487
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5488

J
Jeff Garzik 已提交
5489
		ata_tf_to_host(ap, &qc->tf);
5490

5491 5492 5493
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5494
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5495 5496

			/* always send first data block using
5497
			 * the ata_pio_task() codepath.
5498
			 */
5499
		} else {
5500 5501 5502 5503
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5504
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5505 5506 5507 5508

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5509 5510
		}

L
Linus Torvalds 已提交
5511 5512 5513 5514
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5515 5516 5517
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5518
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5519

5520 5521 5522 5523 5524
		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))
5525
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5526 5527 5528
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5529
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5530

L
Linus Torvalds 已提交
5531 5532
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5533 5534 5535 5536
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5537
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5538 5539 5540 5541
		break;

	default:
		WARN_ON(1);
5542
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557
	}

	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
5558
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5559 5560 5561 5562 5563 5564 5565 5566
 *
 *	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)
{
5567
	struct ata_eh_info *ehi = &ap->eh_info;
5568
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5569

5570
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5571
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5572

5573 5574 5575
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5576 5577 5578
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5579

5580 5581 5582 5583 5584
		/* 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
5585 5586
			goto idle_irq;
		break;
5587 5588 5589 5590 5591
	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
5592 5593
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5594 5595 5596 5597 5598 5599 5600

			/* 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);
5601 5602 5603 5604 5605 5606

			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;
			}
5607 5608 5609 5610
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5611 5612 5613 5614
	default:
		goto idle_irq;
	}

5615 5616 5617 5618
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5619

5620 5621 5622 5623
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5624

5625 5626
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5627

5628
	ata_hsm_move(ap, qc, status, 0);
5629 5630 5631 5632 5633

	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
5634 5635 5636 5637 5638 5639 5640
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5641
		ap->ops->irq_ack(ap, 0); /* debug trap */
5642
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5643
		return 1;
L
Linus Torvalds 已提交
5644 5645 5646 5647 5648 5649 5650
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5651
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5652
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5653
 *
J
Jeff Garzik 已提交
5654 5655 5656
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5657
 *	LOCKING:
J
Jeff Garzik 已提交
5658
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5659 5660
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5661
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5662 5663
 */

5664
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5665
{
J
Jeff Garzik 已提交
5666
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5667 5668 5669 5670 5671
	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
5672
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5673

J
Jeff Garzik 已提交
5674
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5675 5676
		struct ata_port *ap;

J
Jeff Garzik 已提交
5677
		ap = host->ports[i];
5678
		if (ap &&
J
Jeff Garzik 已提交
5679
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5680 5681 5682
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5683
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5684
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5685 5686 5687 5688
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5689
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5690 5691 5692 5693

	return IRQ_RETVAL(handled);
}

5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707
/**
 *	sata_scr_valid - test whether SCRs are accessible
 *	@ap: ATA port to test SCR accessibility for
 *
 *	Test whether SCRs are accessible for @ap.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
int sata_scr_valid(struct ata_port *ap)
{
5708
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830
}

/**
 *	sata_scr_read - read SCR register of the specified port
 *	@ap: ATA port to read SCR for
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
 *	Read SCR register @reg of @ap into *@val.  This function is
 *	guaranteed to succeed if the cable type of the port is SATA
 *	and the port implements ->scr_read.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
{
	if (sata_scr_valid(ap)) {
		*val = ap->ops->scr_read(ap, reg);
		return 0;
	}
	return -EOPNOTSUPP;
}

/**
 *	sata_scr_write - write SCR register of the specified port
 *	@ap: ATA port to write SCR for
 *	@reg: SCR to write
 *	@val: value to write
 *
 *	Write @val to SCR register @reg of @ap.  This function is
 *	guaranteed to succeed if the cable type of the port is SATA
 *	and the port implements ->scr_read.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
int sata_scr_write(struct ata_port *ap, int reg, u32 val)
{
	if (sata_scr_valid(ap)) {
		ap->ops->scr_write(ap, reg, val);
		return 0;
	}
	return -EOPNOTSUPP;
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
 *	@ap: ATA port to write SCR for
 *	@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:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
{
	if (sata_scr_valid(ap)) {
		ap->ops->scr_write(ap, reg, val);
		ap->ops->scr_read(ap, reg);
		return 0;
	}
	return -EOPNOTSUPP;
}

/**
 *	ata_port_online - test whether the given port is online
 *	@ap: ATA port to test
 *
 *	Test whether @ap is online.  Note that this function returns 0
 *	if online status of @ap cannot be obtained, so
 *	ata_port_online(ap) != !ata_port_offline(ap).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
int ata_port_online(struct ata_port *ap)
{
	u32 sstatus;

	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
		return 1;
	return 0;
}

/**
 *	ata_port_offline - test whether the given port is offline
 *	@ap: ATA port to test
 *
 *	Test whether @ap is offline.  Note that this function returns
 *	0 if offline status of @ap cannot be obtained, so
 *	ata_port_online(ap) != !ata_port_offline(ap).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
int ata_port_offline(struct ata_port *ap)
{
	u32 sstatus;

	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
		return 1;
	return 0;
}
E
Edward Falk 已提交
5831

5832
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5833
{
5834
	unsigned int err_mask;
J
Jens Axboe 已提交
5835 5836 5837 5838 5839
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5840
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5841 5842 5843 5844
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5845 5846 5847 5848 5849 5850 5851
	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
5852 5853
}

5854
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5855 5856 5857
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5858 5859 5860 5861
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5862 5863
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902

		/* 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;
		ap->eh_info.action |= action;
		ap->eh_info.flags |= ehi_flags;

		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
5903 5904
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5905 5906
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5907
 *	Suspend @host.  Actual operation is performed by EH.  This
5908 5909 5910 5911 5912 5913 5914 5915 5916
 *	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
5917
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5918
{
5919
	int rc;
5920

J
Jeff Garzik 已提交
5921
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5922 5923
	if (rc == 0)
		host->dev->power.power_state = mesg;
5924 5925 5926 5927
	return rc;
}

/**
J
Jeff Garzik 已提交
5928 5929
 *	ata_host_resume - resume host
 *	@host: host to resume
5930
 *
J
Jeff Garzik 已提交
5931
 *	Resume @host.  Actual operation is performed by EH.  This
5932 5933 5934 5935 5936 5937
 *	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
5938
void ata_host_resume(struct ata_host *host)
5939
{
J
Jeff Garzik 已提交
5940 5941 5942
	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;
5943
}
5944
#endif
5945

5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957
/**
 *	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.
 */
5958
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5959
{
5960
	struct device *dev = ap->dev;
5961
	int rc;
L
Linus Torvalds 已提交
5962

5963 5964
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5965 5966 5967
	if (!ap->prd)
		return -ENOMEM;

5968
	rc = ata_pad_alloc(ap, dev);
5969
	if (rc)
5970
		return rc;
L
Linus Torvalds 已提交
5971

5972 5973
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5974 5975 5976
	return 0;
}

5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988
/**
 *	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)
{
	struct ata_port *ap = dev->ap;
5989 5990
	unsigned long flags;

5991 5992 5993
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5994 5995
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5996
	 * host lock.
5997
	 */
5998
	spin_lock_irqsave(ap->lock, flags);
5999
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6000
	spin_unlock_irqrestore(ap->lock, flags);
6001

6002 6003
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6004 6005 6006 6007 6008
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
6009
/**
6010 6011
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6012
 *
6013 6014 6015 6016
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6017
 *
L
Linus Torvalds 已提交
6018
 *	LOCKING:
6019
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6020
 */
6021
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6022
{
6023
	struct ata_port *ap;
L
Linus Torvalds 已提交
6024 6025
	unsigned int i;

6026 6027 6028 6029 6030 6031
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;

6032
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6033
	ap->lock = &host->lock;
6034
	ap->flags = ATA_FLAG_DISABLED;
6035
	ap->print_id = -1;
L
Linus Torvalds 已提交
6036
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6037
	ap->host = host;
6038 6039
	ap->dev = host->dev;

6040
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
6041 6042
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
6043 6044 6045 6046 6047 6048

#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
6049
#else
6050
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6051
#endif
L
Linus Torvalds 已提交
6052

6053 6054 6055
	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);
6056
	INIT_LIST_HEAD(&ap->eh_done_q);
6057
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
6058

6059 6060
	ap->cbl = ATA_CBL_NONE;

6061 6062
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
6063
		dev->ap = ap;
6064
		dev->devno = i;
6065
		ata_dev_init(dev);
6066
	}
L
Linus Torvalds 已提交
6067 6068 6069 6070 6071 6072 6073 6074

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
	return ap;
}

6075 6076 6077 6078 6079 6080 6081 6082
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];

6083 6084 6085 6086
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6087 6088 6089
			ap->ops->port_stop(ap);
	}

6090
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6091
		host->ops->host_stop(host);
6092

6093 6094 6095
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6096 6097 6098 6099
		if (!ap)
			continue;

		if (ap->scsi_host)
6100 6101
			scsi_host_put(ap->scsi_host);

6102
		kfree(ap);
6103 6104 6105
		host->ports[i] = NULL;
	}

6106
	dev_set_drvdata(gendev, NULL);
6107 6108
}

6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173
/**
 *	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;
}

6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222
/**
 *	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;
		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;
}

6223 6224 6225 6226 6227 6228 6229
/**
 *	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
6230 6231
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248
 *
 *	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];

6249 6250 6251
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276
		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;
}

6277
/**
J
Jeff Garzik 已提交
6278 6279 6280 6281 6282
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6283 6284 6285 6286 6287
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6288
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6289 6290
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6291
{
J
Jeff Garzik 已提交
6292 6293 6294 6295
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6296 6297
}

6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340
/**
 *	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;

6341 6342 6343
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357
	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int irq_line;
		u32 scontrol;
		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 */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
6358 6359
			if (spd)
				ap->hw_sata_spd_limit &= (1 << spd) - 1;
6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

		/* report the secondary IRQ for second channel legacy */
		irq_line = host->irq;
		if (i == 1 && host->irq2)
			irq_line = host->irq2;

		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

		/* print per-port info to dmesg */
		if (!ata_port_is_dummy(ap))
			ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
					"ctl 0x%p bmdma 0x%p irq %d\n",
6375
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404
					ata_mode_string(xfer_mask),
					ap->ioaddr.cmd_addr,
					ap->ioaddr.ctl_addr,
					ap->ioaddr.bmdma_addr,
					irq_line);
		else
			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) {
			struct ata_eh_info *ehi = &ap->eh_info;
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
			spin_lock_irqsave(ap->lock, flags);

			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

6405
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6406 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 6433 6434 6435 6436 6437 6438 6439
			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];

		ata_scsi_scan_host(ap);
	}

	return 0;
}

6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473
/**
 *	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)
{
	int rc;

	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;

T
Tejun Heo 已提交
6474 6475 6476
	/* Used to print device info at probe */
	host->irq = irq;

6477 6478 6479 6480 6481 6482 6483 6484
	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;
}

6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501
/**
 *	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;
	int i;

	if (!ap->ops->error_handler)
6502
		goto skip_eh;
6503 6504

	/* tell EH we're leaving & flush EH */
6505
	spin_lock_irqsave(ap->lock, flags);
6506
	ap->pflags |= ATA_PFLAG_UNLOADING;
6507
	spin_unlock_irqrestore(ap->lock, flags);
6508 6509 6510 6511 6512 6513

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6514
	spin_lock_irqsave(ap->lock, flags);
6515 6516 6517 6518

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		ata_dev_disable(&ap->device[i]);

6519
	spin_unlock_irqrestore(ap->lock, flags);
6520 6521 6522 6523 6524

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6525
	spin_lock_irqsave(ap->lock, flags);
6526
	ata_port_freeze(ap);	/* won't be thawed */
6527
	spin_unlock_irqrestore(ap->lock, flags);
6528 6529

	ata_port_wait_eh(ap);
6530
	cancel_rearming_delayed_work(&ap->hotplug_task);
6531

6532
 skip_eh:
6533
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6534
	scsi_remove_host(ap->scsi_host);
6535 6536
}

T
Tejun Heo 已提交
6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553
/**
 *	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
6554 6555 6556
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6557 6558 6559 6560 6561 6562 6563
 *
 *	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
6564
 */
E
Edward Falk 已提交
6565

L
Linus Torvalds 已提交
6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579
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
6580

6581 6582
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6583 6584 6585 6586
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6587 6588 6589
 *	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
6590 6591 6592 6593
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6594
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6595 6596
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6597
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6598

T
Tejun Heo 已提交
6599
	ata_host_detach(host);
L
Linus Torvalds 已提交
6600 6601 6602
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6603
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634
{
	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
6635

6636
#ifdef CONFIG_PM
6637
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6638 6639
{
	pci_save_state(pdev);
6640
	pci_disable_device(pdev);
6641

6642
	if (mesg.event == PM_EVENT_SUSPEND)
6643
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6644 6645
}

6646
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6647
{
6648 6649
	int rc;

J
Jens Axboe 已提交
6650 6651
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6652

T
Tejun Heo 已提交
6653
	rc = pcim_enable_device(pdev);
6654 6655 6656 6657 6658 6659
	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
6660
	pci_set_master(pdev);
6661
	return 0;
6662 6663
}

6664
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6665
{
J
Jeff Garzik 已提交
6666
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6667 6668
	int rc = 0;

J
Jeff Garzik 已提交
6669
	rc = ata_host_suspend(host, mesg);
6670 6671 6672
	if (rc)
		return rc;

6673
	ata_pci_device_do_suspend(pdev, mesg);
6674 6675 6676 6677 6678 6679

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6680
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6681
	int rc;
6682

6683 6684 6685 6686
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6687
}
6688 6689
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6690 6691 6692 6693 6694
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6695
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6696 6697 6698 6699
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6700 6701 6702 6703 6704 6705
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6706 6707 6708 6709 6710 6711 6712
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6713
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6714 6715
}

6716
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6717 6718
module_exit(ata_exit);

6719
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6720
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739

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;
}

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 6779 6780 6781 6782 6783 6784 6785
/**
 *	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
6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818
/*
 * 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 = {
	.port_disable		= ata_port_disable,
	.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,
};

6819 6820 6821 6822
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6823 6824 6825 6826 6827 6828 6829
/*
 * 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.
 */

6830 6831 6832
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
6833
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6834
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
6835 6836
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6837
EXPORT_SYMBOL_GPL(ata_host_init);
6838
EXPORT_SYMBOL_GPL(ata_host_alloc);
6839
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6840
EXPORT_SYMBOL_GPL(ata_host_start);
6841
EXPORT_SYMBOL_GPL(ata_host_register);
6842
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6843
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6844 6845
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6846
EXPORT_SYMBOL_GPL(ata_hsm_move);
6847
EXPORT_SYMBOL_GPL(ata_qc_complete);
6848
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6849 6850 6851 6852 6853
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);
6854
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6855 6856 6857 6858 6859 6860
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);
6861
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
6862
EXPORT_SYMBOL_GPL(ata_interrupt);
6863
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
6864 6865
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6866
EXPORT_SYMBOL_GPL(ata_qc_prep);
6867
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
6868
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6869 6870 6871 6872 6873
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);
6874 6875 6876 6877 6878
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
6879
EXPORT_SYMBOL_GPL(ata_port_probe);
6880
EXPORT_SYMBOL_GPL(ata_dev_disable);
6881
EXPORT_SYMBOL_GPL(sata_set_spd);
6882 6883
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6884 6885 6886
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6887
EXPORT_SYMBOL_GPL(ata_std_prereset);
6888
EXPORT_SYMBOL_GPL(ata_std_softreset);
6889
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6890 6891
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6892 6893
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6894
EXPORT_SYMBOL_GPL(ata_port_disable);
6895
EXPORT_SYMBOL_GPL(ata_ratelimit);
6896
EXPORT_SYMBOL_GPL(ata_wait_register);
6897
EXPORT_SYMBOL_GPL(ata_busy_sleep);
6898
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
6899
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6900 6901 6902
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6903
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6904
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6905
EXPORT_SYMBOL_GPL(ata_host_intr);
6906 6907 6908 6909 6910 6911
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);
EXPORT_SYMBOL_GPL(ata_port_online);
EXPORT_SYMBOL_GPL(ata_port_offline);
6912
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6913 6914
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6915
#endif /* CONFIG_PM */
6916 6917
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6918
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6919
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6920 6921
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6922
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6923 6924 6925
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6926 6927
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6928
EXPORT_SYMBOL_GPL(ata_pci_init_native_host);
T
Tejun Heo 已提交
6929
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
6930
EXPORT_SYMBOL_GPL(ata_pci_prepare_native_host);
L
Linus Torvalds 已提交
6931 6932
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6933
#ifdef CONFIG_PM
6934 6935
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6936 6937
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6938
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6939 6940
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6941
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6942

6943
EXPORT_SYMBOL_GPL(ata_eng_timeout);
6944 6945
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6946 6947 6948
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6949 6950
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6951
EXPORT_SYMBOL_GPL(ata_do_eh);
6952 6953 6954 6955
EXPORT_SYMBOL_GPL(ata_irq_on);
EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
EXPORT_SYMBOL_GPL(ata_irq_ack);
EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
A
Akira Iguchi 已提交
6956
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6957 6958 6959 6960 6961

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
EXPORT_SYMBOL_GPL(ata_cable_sata);