libata-core.c 157.2 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	"2.20"	/* 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

T
Tejun Heo 已提交
75
static 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
Andrew Morton 已提交
92 93 94 95
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)");

96 97
int libata_noacpi = 1;
module_param_named(noacpi, libata_noacpi, int, 0444);
98 99
MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");

L
Linus Torvalds 已提交
100 101 102 103 104
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

E
Edward Falk 已提交
105

L
Linus Torvalds 已提交
106 107 108 109 110 111 112 113 114 115 116 117 118
/**
 *	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
119
void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
L
Linus Torvalds 已提交
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
{
	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
 *
153
 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
L
Linus Torvalds 已提交
154 155 156 157 158
 *
 *	LOCKING:
 *	Inherited from caller.
 */

J
Jeff Garzik 已提交
159
void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
L
Linus Torvalds 已提交
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176
{
	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];
}

177 178 179 180 181 182
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
183 184 185 186
	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
187 188 189 190 191
	/* 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
192 193 194 195
	0,
	0,
	0,
	0,
196 197 198 199
	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
T
Tejun Heo 已提交
200 201 202 203 204
	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
205
};
L
Linus Torvalds 已提交
206 207

/**
208
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
209 210
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
L
Linus Torvalds 已提交
211
 *
212
 *	Examine the device configuration and tf->flags to calculate
213
 *	the proper read/write commands and protocol to use.
L
Linus Torvalds 已提交
214 215 216 217
 *
 *	LOCKING:
 *	caller.
 */
218
static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
L
Linus Torvalds 已提交
219
{
T
Tejun Heo 已提交
220
	u8 cmd;
L
Linus Torvalds 已提交
221

T
Tejun Heo 已提交
222
	int index, fua, lba48, write;
223

T
Tejun Heo 已提交
224
	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
225 226
	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
L
Linus Torvalds 已提交
227

228 229
	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
230
		index = dev->multi_count ? 0 : 8;
231
	} else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
232 233
		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
234
		index = dev->multi_count ? 0 : 8;
235 236
	} else {
		tf->protocol = ATA_PROT_DMA;
T
Tejun Heo 已提交
237
		index = 16;
238
	}
L
Linus Torvalds 已提交
239

T
Tejun Heo 已提交
240 241 242 243 244 245
	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
L
Linus Torvalds 已提交
246 247
}

248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290
/**
 *	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;
}

291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
/**
 *	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;

318
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
		/* 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;
}

414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
/**
 *	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);
}

438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
/**
 *	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;
}

461
static const struct ata_xfer_ent {
462
	int shift, bits;
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
	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
539
/**
540 541
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
L
Linus Torvalds 已提交
542 543
 *
 *	Determine string which represents the highest speed
544
 *	(highest bit in @modemask).
L
Linus Torvalds 已提交
545 546 547 548 549 550
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
551
 *	@mode_mask, or the constant C string "<n/a>".
L
Linus Torvalds 已提交
552
 */
553
static const char *ata_mode_string(unsigned int xfer_mask)
L
Linus Torvalds 已提交
554
{
555 556 557 558 559 560
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
561 562
		"PIO5",
		"PIO6",
563 564 565
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
566 567
		"MWDMA3",
		"MWDMA4",
568 569 570 571 572 573 574 575 576
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
577
	int highbit;
L
Linus Torvalds 已提交
578

579 580 581
	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
582 583 584
	return "<n/a>";
}

585 586 587 588 589 590 591 592 593 594 595 596
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
597
void ata_dev_disable(struct ata_device *dev)
598
{
599
	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
600
		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
601 602
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
603 604 605 606
		dev->class++;
	}
}

L
Linus Torvalds 已提交
607
/**
T
Tejun Heo 已提交
608
 *	ata_devchk - PATA device presence detection
L
Linus Torvalds 已提交
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624
 *	@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
625
static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
L
Linus Torvalds 已提交
626 627 628 629 630 631
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

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

T
Tejun Heo 已提交
632 633
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
634

T
Tejun Heo 已提交
635 636
	iowrite8(0xaa, ioaddr->nsect_addr);
	iowrite8(0x55, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
637

T
Tejun Heo 已提交
638 639
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
640

T
Tejun Heo 已提交
641 642
	nsect = ioread8(ioaddr->nsect_addr);
	lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665

	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
666
unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
Linus Torvalds 已提交
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
{
	/* 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)
693
 *	@r_err: Value of error register on completion
L
Linus Torvalds 已提交
694 695 696 697 698 699 700 701 702 703 704 705
 *
 *	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.
706 707 708
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
L
Linus Torvalds 已提交
709 710
 */

A
Akira Iguchi 已提交
711
unsigned int
712
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
L
Linus Torvalds 已提交
713 714 715 716 717 718 719 720 721 722
{
	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);
723
	err = tf.feature;
724 725
	if (r_err)
		*r_err = err;
L
Linus Torvalds 已提交
726

727 728 729 730 731
	/* 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
732 733 734 735
		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
736
		return ATA_DEV_NONE;
L
Linus Torvalds 已提交
737

738
	/* determine if device is ATA or ATAPI */
L
Linus Torvalds 已提交
739
	class = ata_dev_classify(&tf);
740

L
Linus Torvalds 已提交
741
	if (class == ATA_DEV_UNKNOWN)
742
		return ATA_DEV_NONE;
L
Linus Torvalds 已提交
743
	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
744 745
		return ATA_DEV_NONE;
	return class;
L
Linus Torvalds 已提交
746 747 748
}

/**
749
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
Linus Torvalds 已提交
750 751 752 753 754 755 756 757 758 759 760 761 762
 *	@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.
 */

763 764
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
Linus Torvalds 已提交
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

782
/**
783
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
784 785 786 787 788
 *	@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.
 *
789
 *	This function is identical to ata_id_string except that it
790 791 792 793 794 795
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
796 797
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
798 799 800 801 802
{
	unsigned char *p;

	WARN_ON(!(len & 1));

803
	ata_id_string(id, s, ofs, len - 1);
804 805 806 807 808 809

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
Edward Falk 已提交
810

811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
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];
	}
}

826 827 828
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
R
Randy Dunlap 已提交
829
 *	@unknown: mode to assume if we cannot tell
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
 *
 *	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
868 869 870 871 872 873 874 875 876 877 878 879
/**
 *	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
880 881 882 883
void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
{
}

E
Edward Falk 已提交
884

L
Linus Torvalds 已提交
885 886 887 888 889 890 891
/**
 *	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
892 893 894
 *	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
895 896 897 898 899 900 901 902 903 904 905 906 907 908
 *
 *	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
909
	iowrite8(tmp, ap->ioaddr.device_addr);
L
Linus Torvalds 已提交
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
	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
935
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
936 937
		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
L
Linus Torvalds 已提交
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952

	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
953
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
954
 *
955 956
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
957 958 959 960 961
 *
 *	LOCKING:
 *	caller.
 */

962
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
963 964 965 966 967 968
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
969 970 971 972 973
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
974 975 976 977 978
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
979 980 981 982 983
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
984 985
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
986 987
		id[88],
		id[93]);
L
Linus Torvalds 已提交
988 989
}

990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
/**
 *	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.
		 */
1019
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1020 1021 1022 1023
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033

		/* 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;
1034

1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	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);
	}

1052 1053 1054
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1055 1056 1057 1058

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1059 1060 1061
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1062
 *	@fn: workqueue function to be scheduled
1063
 *	@data: data for @fn to use
1064
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
 *
 *	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.
 */
1078
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1079 1080 1081 1082
			 unsigned long delay)
{
	int rc;

1083
	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
T
Tejun Heo 已提交
1084 1085
		return;

1086 1087
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
Tejun Heo 已提交
1088

1089
	rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110

	/* rc == 0 means that another user is using port task */
	WARN_ON(rc == 0);
}

/**
 *	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)
{
	unsigned long flags;

	DPRINTK("ENTER\n");

1111
	spin_lock_irqsave(ap->lock, flags);
1112
	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
1113
	spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123

	DPRINTK("flush #1\n");
	flush_workqueue(ata_wq);

	/*
	 * At this point, if a task is running, it's guaranteed to see
	 * the FLUSH flag; thus, it will never queue pio tasks again.
	 * Cancel and flush.
	 */
	if (!cancel_delayed_work(&ap->port_task)) {
1124
		if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1125 1126
			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
					__FUNCTION__);
T
Tejun Heo 已提交
1127 1128 1129
		flush_workqueue(ata_wq);
	}

1130
	spin_lock_irqsave(ap->lock, flags);
1131
	ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
1132
	spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
1133

1134 1135
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
Tejun Heo 已提交
1136 1137
}

1138
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1139
{
1140
	struct completion *waiting = qc->private_data;
1141 1142 1143 1144 1145

	complete(waiting);
}

/**
1146
 *	ata_exec_internal_sg - execute libata internal command
1147 1148
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1149
 *	@cdb: CDB for packet command
1150
 *	@dma_dir: Data tranfer direction of the command
1151 1152
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1153 1154 1155 1156 1157 1158 1159 1160 1161
 *
 *	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.
1162 1163 1164
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1165
 */
1166 1167 1168 1169
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)
1170
{
T
Tejun Heo 已提交
1171
	struct ata_port *ap = dev->ap;
1172 1173
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1174
	unsigned int tag, preempted_tag;
1175
	u32 preempted_sactive, preempted_qc_active;
1176
	DECLARE_COMPLETION_ONSTACK(wait);
1177
	unsigned long flags;
1178
	unsigned int err_mask;
1179
	int rc;
1180

1181
	spin_lock_irqsave(ap->lock, flags);
1182

1183
	/* no internal command while frozen */
1184
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1185
		spin_unlock_irqrestore(ap->lock, flags);
1186 1187 1188
		return AC_ERR_SYSTEM;
	}

1189
	/* initialize internal qc */
1190

1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
	/* 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;

1201
	if (test_and_set_bit(tag, &ap->qc_allocated))
1202
		BUG();
1203
	qc = __ata_qc_from_tag(ap, tag);
1204 1205 1206 1207 1208 1209 1210 1211

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

	preempted_tag = ap->active_tag;
1212 1213
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1214
	ap->active_tag = ATA_TAG_POISON;
1215 1216
	ap->sactive = 0;
	ap->qc_active = 0;
1217 1218

	/* prepare & issue qc */
1219
	qc->tf = *tf;
1220 1221
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1222
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1223 1224
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1225 1226 1227 1228 1229 1230
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1231
		qc->nbytes = buflen;
1232 1233
	}

1234
	qc->private_data = &wait;
1235 1236
	qc->complete_fn = ata_qc_complete_internal;

1237
	ata_qc_issue(qc);
1238

1239
	spin_unlock_irqrestore(ap->lock, flags);
1240

A
Andrew Morton 已提交
1241
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1242 1243

	ata_port_flush_task(ap);
1244

1245
	if (!rc) {
1246
		spin_lock_irqsave(ap->lock, flags);
1247 1248 1249

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1250 1251
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1252
		 */
1253
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1254 1255 1256 1257 1258 1259
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1260

1261 1262
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1263
					"qc timeout (cmd 0x%x)\n", command);
1264 1265
		}

1266
		spin_unlock_irqrestore(ap->lock, flags);
1267 1268
	}

1269 1270 1271 1272
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

A
Alan 已提交
1273
	if ((qc->flags & ATA_QCFLAG_FAILED) && !qc->err_mask) {
1274
		if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1275
			ata_dev_printk(dev, KERN_WARNING,
1276
				"zero err_mask for failed "
T
Tejun Heo 已提交
1277
				"internal command, assuming AC_ERR_OTHER\n");
1278 1279 1280
		qc->err_mask |= AC_ERR_OTHER;
	}

1281
	/* finish up */
1282
	spin_lock_irqsave(ap->lock, flags);
1283

1284
	*tf = qc->result_tf;
1285 1286 1287
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1288
	ap->active_tag = preempted_tag;
1289 1290
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1291

1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	/* 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.
	 */
1303
	if (ap->flags & ATA_FLAG_DISABLED) {
1304 1305 1306 1307
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1308
	spin_unlock_irqrestore(ap->lock, flags);
1309

1310
	return err_mask;
1311 1312
}

1313
/**
1314
 *	ata_exec_internal - execute libata internal command
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
 *	@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)
{
1335 1336
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1337

1338 1339 1340 1341 1342 1343
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1344

1345
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1346 1347
}

1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
/**
 *	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
1361
 */
1362
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1363 1364 1365 1366 1367 1368 1369 1370 1371
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1372
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1373 1374
}

1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
/**
 *	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.
 */

unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
	int pio;
	int speed = adev->pio_mode - XFER_PIO_0;

	if (speed < 2)
		return 0;
	if (speed > 2)
		return 1;
1392

1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
	/* If we have no drive specific rule, then PIO 2 is non IORDY */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
		pio = adev->id[ATA_ID_EIDE_PIO];
		/* 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 */
				return 1;
			return 0;
		}
	}
	return 0;
}

L
Linus Torvalds 已提交
1408
/**
1409 1410 1411
 *	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)
1412
 *	@flags: ATA_READID_* flags
1413
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1414
 *
1415 1416
 *	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
1417 1418
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1419 1420
 *
 *	LOCKING:
1421 1422 1423 1424
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1425
 */
1426
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1427
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1428
{
T
Tejun Heo 已提交
1429
	struct ata_port *ap = dev->ap;
1430
	unsigned int class = *p_class;
1431
	struct ata_taskfile tf;
1432 1433 1434
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1435

1436
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1437
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1438

1439
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1440

1441
 retry:
T
Tejun Heo 已提交
1442
	ata_tf_init(dev, &tf);
1443

1444 1445
	switch (class) {
	case ATA_DEV_ATA:
1446
		tf.command = ATA_CMD_ID_ATA;
1447 1448
		break;
	case ATA_DEV_ATAPI:
1449
		tf.command = ATA_CMD_ID_ATAPI;
1450 1451 1452 1453 1454
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1455 1456
	}

1457
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467

	/* 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
1468

T
Tejun Heo 已提交
1469
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1470
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1471
	if (err_mask) {
1472
		if (err_mask & AC_ERR_NODEV_HINT) {
1473
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1474
				ap->print_id, dev->devno);
1475 1476 1477
			return -ENOENT;
		}

1478 1479
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1480 1481 1482
		goto err_out;
	}

1483
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1484

1485
	/* sanity check */
1486 1487 1488 1489 1490 1491 1492 1493 1494
	rc = -EINVAL;
	reason = "device reports illegal type";

	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;
1495 1496
	}

1497
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1498 1499 1500 1501 1502 1503 1504 1505 1506
		/*
		 * 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
1507
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1508 1509 1510 1511 1512 1513 1514 1515 1516
			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.
			 */
1517
			flags &= ~ATA_READID_POSTRESET;
1518 1519 1520 1521 1522
			goto retry;
		}
	}

	*p_class = class;
1523

1524 1525 1526
	return 0;

 err_out:
T
Tejun Heo 已提交
1527
	if (ata_msg_warn(ap))
1528
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1529
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1530 1531 1532
	return rc;
}

T
Tejun Heo 已提交
1533
static inline u8 ata_dev_knobble(struct ata_device *dev)
1534
{
T
Tejun Heo 已提交
1535
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1536 1537
}

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
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;
	}
1548 1549 1550 1551
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1552
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1553
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1554 1555 1556 1557 1558 1559 1560 1561 1562
		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);
}

1563
/**
1564 1565 1566 1567 1568
 *	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.
1569 1570
 *
 *	LOCKING:
1571 1572 1573 1574
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1575
 */
1576
int ata_dev_configure(struct ata_device *dev)
1577
{
T
Tejun Heo 已提交
1578
	struct ata_port *ap = dev->ap;
1579
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1580
	const u16 *id = dev->id;
1581
	unsigned int xfer_mask;
1582
	char revbuf[7];		/* XYZ-99\0 */
1583 1584
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1585
	int rc;
1586

1587
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1588 1589
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1590
		return 0;
1591 1592
	}

1593
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1594
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1595

1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
	/* set _SDD */
	rc = ata_acpi_push_id(ap, dev->devno);
	if (rc) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set _SDD(%d)\n",
			rc);
	}

	/* retrieve and execute the ATA task file of _GTF */
	ata_acpi_exec_tfs(ap);

1606
	/* print device capabilities */
1607
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1608 1609 1610
		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",
1611
			       __FUNCTION__,
1612 1613
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1614

1615
	/* initialize to-be-configured parameters */
1616
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1617 1618 1619 1620 1621 1622 1623
	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
1624 1625 1626 1627
	/*
	 * common ATA, ATAPI feature tests
	 */

1628
	/* find max transfer mode; for printk only */
1629
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1630

1631 1632
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1633 1634 1635

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1636 1637
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1638 1639 1640
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1641 1642 1643 1644 1645
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1646
		dev->n_sectors = ata_id_n_sectors(id);
1647

1648
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1649
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1650 1651
				sizeof(fwrevbuf));

1652
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1653 1654 1655 1656 1657
				sizeof(modelbuf));

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

1658
		if (ata_id_has_lba(id)) {
1659
			const char *lba_desc;
1660
			char ncq_desc[20];
1661

1662 1663
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1664
			if (ata_id_has_lba48(id)) {
1665
				dev->flags |= ATA_DFLAG_LBA48;
1666
				lba_desc = "LBA48";
1667 1668 1669 1670

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1671
			}
1672

1673 1674 1675
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1676
			/* print device info to dmesg */
1677 1678 1679 1680 1681 1682 1683
			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",
1684
					(unsigned long long)dev->n_sectors,
1685 1686
					dev->multi_count, lba_desc, ncq_desc);
			}
1687
		} else {
1688 1689 1690
			/* CHS */

			/* Default translation */
1691 1692 1693
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1694

1695
			if (ata_id_current_chs_valid(id)) {
1696
				/* Current CHS translation is valid. */
1697 1698 1699
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1700 1701 1702
			}

			/* print device info to dmesg */
1703
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1704
				ata_dev_printk(dev, KERN_INFO,
1705 1706 1707
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1708
				ata_dev_printk(dev, KERN_INFO,
1709 1710 1711 1712 1713
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1714 1715
		}

1716
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1717 1718 1719
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1720
	else if (dev->class == ATA_DEV_ATAPI) {
1721 1722
		char *cdb_intr_string = "";

1723
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1724
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1725
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1726 1727
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1728
			rc = -EINVAL;
L
Linus Torvalds 已提交
1729 1730
			goto err_out_nosup;
		}
1731
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1732

1733
		if (ata_id_cdb_intr(dev->id)) {
1734
			dev->flags |= ATA_DFLAG_CDB_INTR;
1735 1736
			cdb_intr_string = ", CDB intr";
		}
1737

L
Linus Torvalds 已提交
1738
		/* print device info to dmesg */
1739
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1740 1741 1742
			ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1743 1744
	}

1745 1746 1747 1748 1749
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	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");
		}
	}

1762
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1763
	if (ata_dev_knobble(dev)) {
1764
		if (ata_msg_drv(ap) && print_info)
1765 1766
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1767
		dev->udma_mask &= ATA_UDMA5;
1768 1769 1770
		dev->max_sectors = ATA_MAX_SECTORS;
	}

1771 1772 1773
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
		dev->max_sectors = min(ATA_MAX_SECTORS_128, dev->max_sectors);

1774 1775 1776 1777
	/* limit ATAPI DMA to R/W commands only */
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
		dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;

1778
	if (ap->ops->dev_config)
1779
		ap->ops->dev_config(dev);
1780

1781 1782 1783
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1784
	return 0;
L
Linus Torvalds 已提交
1785 1786

err_out_nosup:
1787
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1788 1789
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1790
	return rc;
L
Linus Torvalds 已提交
1791 1792 1793 1794 1795 1796
}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1797 1798 1799 1800
 *	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
1801
 *	LOCKING:
J
Jeff Garzik 已提交
1802
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1803 1804
 *
 *	RETURNS:
1805
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1806 1807
 */

1808
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1809
{
1810
	unsigned int classes[ATA_MAX_DEVICES];
1811
	int tries[ATA_MAX_DEVICES];
1812
	int i, rc;
1813
	struct ata_device *dev;
L
Linus Torvalds 已提交
1814

1815
	ata_port_probe(ap);
1816

1817 1818 1819 1820
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
1821
	/* reset and determine device classes */
1822
	ap->ops->phy_reset(ap);
1823

1824 1825
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1826

1827 1828 1829 1830 1831
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1832

1833
		dev->class = ATA_DEV_UNKNOWN;
1834
	}
L
Linus Torvalds 已提交
1835

1836
	ata_port_probe(ap);
1837

A
Alan Cox 已提交
1838 1839 1840 1841 1842 1843
	/* 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;

1844 1845 1846 1847 1848
	/* 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--) {
1849
		dev = &ap->device[i];
1850

1851 1852
		if (tries[i])
			dev->class = classes[i];
1853

1854
		if (!ata_dev_enabled(dev))
1855 1856
			continue;

1857 1858
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1859 1860
		if (rc)
			goto fail;
1861 1862 1863 1864 1865 1866 1867 1868 1869
	}

	/* 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;
1870

1871 1872 1873
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1874 1875
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1876 1877
	}

1878
	/* configure transfer mode */
1879
	rc = ata_set_mode(ap, &dev);
1880
	if (rc)
1881
		goto fail;
L
Linus Torvalds 已提交
1882

1883 1884 1885
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1886

1887 1888
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1889
	ap->ops->port_disable(ap);
1890
	return -ENODEV;
1891 1892

 fail:
1893 1894
	tries[dev->devno]--;

1895 1896
	switch (rc) {
	case -EINVAL:
1897
		/* eeek, something went very wrong, give up */
1898 1899
		tries[dev->devno] = 0;
		break;
1900 1901 1902 1903

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
1904
	case -EIO:
1905 1906 1907 1908 1909 1910 1911
		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);
		}
1912 1913
	}

1914
	if (!tries[dev->devno])
T
Tejun Heo 已提交
1915
		ata_dev_disable(dev);
1916

1917
	goto retry;
L
Linus Torvalds 已提交
1918 1919 1920
}

/**
J
Jeff Garzik 已提交
1921 1922
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1923
 *
J
Jeff Garzik 已提交
1924 1925 1926
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1927
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1928
 *	serialization.
L
Linus Torvalds 已提交
1929 1930 1931 1932
 */

void ata_port_probe(struct ata_port *ap)
{
1933
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1934 1935
}

1936 1937 1938 1939 1940 1941 1942 1943 1944
/**
 *	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.
 */
1945
void sata_print_link_status(struct ata_port *ap)
1946
{
1947
	u32 sstatus, scontrol, tmp;
1948

1949
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1950
		return;
1951
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1952

1953
	if (ata_port_online(ap)) {
1954
		tmp = (sstatus >> 4) & 0xf;
1955 1956 1957
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1958
	} else {
1959 1960 1961
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1962 1963 1964
	}
}

L
Linus Torvalds 已提交
1965
/**
J
Jeff Garzik 已提交
1966 1967
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1968
 *
J
Jeff Garzik 已提交
1969 1970 1971
 *	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
1972 1973
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1974
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1975 1976 1977 1978 1979 1980 1981 1982
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1983
		/* issue phy wake/reset */
1984
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1985 1986 1987
		/* 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
1988
	}
1989 1990
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1991 1992 1993 1994

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1995
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1996 1997 1998 1999
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2000 2001
	/* print link status */
	sata_print_link_status(ap);
2002

2003
	/* TODO: phy layer with polling, timeouts, etc. */
2004
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2005
		ata_port_probe(ap);
2006
	else
L
Linus Torvalds 已提交
2007 2008
		ata_port_disable(ap);

2009
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
		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
2021 2022
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2023
 *
J
Jeff Garzik 已提交
2024 2025
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2026 2027
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2028
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2029 2030 2031 2032 2033
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2034
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2035 2036 2037 2038
		return;
	ata_bus_reset(ap);
}

2039 2040 2041 2042 2043 2044 2045
/**
 *	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
 */
2046

T
Tejun Heo 已提交
2047
struct ata_device *ata_dev_pair(struct ata_device *adev)
2048
{
T
Tejun Heo 已提交
2049
	struct ata_port *ap = adev->ap;
2050
	struct ata_device *pair = &ap->device[1 - adev->devno];
2051
	if (!ata_dev_enabled(pair))
2052 2053 2054 2055
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2056
/**
J
Jeff Garzik 已提交
2057 2058
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2059
 *
J
Jeff Garzik 已提交
2060 2061 2062 2063 2064
 *	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
2065
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2066
 *	serialization.
L
Linus Torvalds 已提交
2067 2068 2069 2070 2071 2072
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2073
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2074 2075
}

2076
/**
2077
 *	sata_down_spd_limit - adjust SATA spd limit downward
2078 2079 2080 2081
 *	@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
2082
 *	using sata_set_spd().
2083 2084 2085 2086 2087 2088 2089
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2090
int sata_down_spd_limit(struct ata_port *ap)
2091
{
2092 2093
	u32 sstatus, spd, mask;
	int rc, highbit;
2094

2095 2096 2097
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2098 2099 2100 2101 2102 2103 2104

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

2105
	spd = (sstatus >> 4) & 0xf;
2106 2107 2108 2109 2110 2111 2112 2113 2114
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2115 2116
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2117 2118 2119 2120

	return 0;
}

2121
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
{
	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;
}

/**
2137
 *	sata_set_spd_needed - is SATA spd configuration needed
2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
 *	@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.
 */
2151
int sata_set_spd_needed(struct ata_port *ap)
2152 2153 2154
{
	u32 scontrol;

2155
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2156 2157
		return 0;

2158
	return __sata_set_spd_needed(ap, &scontrol);
2159 2160 2161
}

/**
2162
 *	sata_set_spd - set SATA spd according to spd limit
2163 2164 2165 2166 2167 2168 2169 2170 2171
 *	@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
2172
 *	changed.  Negative errno if SCR registers are inaccessible.
2173
 */
2174
int sata_set_spd(struct ata_port *ap)
2175 2176
{
	u32 scontrol;
2177
	int rc;
2178

2179 2180
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2181

2182
	if (!__sata_set_spd_needed(ap, &scontrol))
2183 2184
		return 0;

2185 2186 2187
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2188 2189 2190
	return 1;
}

A
Alan Cox 已提交
2191 2192 2193 2194 2195
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2196
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2197
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2198 2199 2200
 * 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
2201 2202 2203 2204 2205 2206 2207 2208 2209
 */

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 },

2210 2211
	{ 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
2212 2213 2214 2215 2216
	{ 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 }, */
2217

A
Alan Cox 已提交
2218 2219 2220
	{ 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 },
2221

A
Alan Cox 已提交
2222 2223 2224 2225
	{ 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 },

2226 2227
	{ 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
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
	{ 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
2273
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2274
			return NULL;
2275
	return t;
A
Alan Cox 已提交
2276 2277 2278 2279 2280 2281 2282 2283 2284
}

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;

	/*
2285
	 * Find the mode.
2286
	 */
A
Alan Cox 已提交
2287 2288 2289 2290

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

2291 2292
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
	/*
	 * 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.
	 */

2313
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2314 2315

	/*
2316 2317 2318
	 * 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
2319 2320
	 */

2321
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2322 2323 2324 2325 2326
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2327
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
	 */

	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;
	}

	return 0;
}

2343 2344 2345
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2346
 *	@sel: ATA_DNXFER_* selector
2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357
 *
 *	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
 */
2358
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2359
{
2360 2361 2362 2363
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2364

2365 2366
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2367

2368 2369 2370 2371
	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);
2372

2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424
	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);
	}
2425 2426 2427 2428 2429 2430 2431

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

	return 0;
}

T
Tejun Heo 已提交
2432
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2433
{
2434
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2435 2436
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2437

2438
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2439 2440 2441
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2442
	err_mask = ata_dev_set_xfermode(dev);
2443 2444 2445 2446
	/* 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;

2447
	if (err_mask) {
2448 2449
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2450 2451
		return -EIO;
	}
L
Linus Torvalds 已提交
2452

2453
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2454
	rc = ata_dev_revalidate(dev, 0);
2455
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2456
	if (rc)
2457
		return rc;
2458

2459 2460
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2461

2462 2463
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2464
	return 0;
L
Linus Torvalds 已提交
2465 2466 2467 2468 2469
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2470
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2471
 *
2472 2473 2474
 *	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.
J
Jeff Garzik 已提交
2475
 *
L
Linus Torvalds 已提交
2476
 *	LOCKING:
J
Jeff Garzik 已提交
2477
 *	PCI/etc. bus probe sem.
2478 2479 2480
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2481
 */
2482
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2483
{
2484
	struct ata_device *dev;
2485
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2486

2487
	/* has private set_mode? */
A
Alan 已提交
2488 2489
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2490

2491 2492
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2493
		unsigned int pio_mask, dma_mask;
2494

2495 2496
		dev = &ap->device[i];

2497
		if (!ata_dev_enabled(dev))
2498 2499
			continue;

T
Tejun Heo 已提交
2500
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2501

2502 2503 2504 2505
		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);
2506

2507
		found = 1;
2508 2509
		if (dev->dma_mode)
			used_dma = 1;
2510
	}
2511
	if (!found)
2512
		goto out;
2513 2514

	/* step 2: always set host PIO timings */
2515 2516 2517 2518 2519 2520
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2521
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2522
			rc = -EINVAL;
2523
			goto out;
2524 2525 2526 2527 2528 2529 2530
		}

		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
2531

2532
	/* step 3: set host DMA timings */
2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543
	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
2544 2545

	/* step 4: update devices' xfer mode */
2546
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2547
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2548

A
Alan 已提交
2549
		/* don't update suspended devices' xfer mode */
2550
		if (!ata_dev_ready(dev))
2551 2552
			continue;

T
Tejun Heo 已提交
2553
		rc = ata_dev_set_mode(dev);
2554
		if (rc)
2555
			goto out;
2556
	}
L
Linus Torvalds 已提交
2557

2558 2559
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2560
	 */
J
Jeff Garzik 已提交
2561
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2562
		ap->host->simplex_claimed = ap;
2563

2564
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2565 2566
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);
2567 2568 2569 2570
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2571 2572
}

2573 2574 2575 2576 2577 2578 2579 2580 2581 2582
/**
 *	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
2583
 *	spin_lock_irqsave(host lock)
2584 2585 2586 2587 2588 2589 2590 2591 2592
 */

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
2593 2594 2595 2596 2597 2598
/**
 *	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
2599 2600 2601
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2602 2603 2604 2605 2606
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2607
 */
2608 2609
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2610 2611 2612 2613 2614 2615 2616
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2617 2618
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2619 2620 2621 2622
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2623
	if (status != 0xff && (status & ATA_BUSY))
2624
		ata_port_printk(ap, KERN_WARNING,
2625 2626
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2627 2628

	timeout = timer_start + tmout;
2629 2630
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2631 2632 2633 2634
		msleep(50);
		status = ata_chk_status(ap);
	}

2635 2636 2637
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2638
	if (status & ATA_BUSY) {
2639
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2640 2641
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2642
		return -EBUSY;
L
Linus Torvalds 已提交
2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668
	}

	return 0;
}

static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
	unsigned long timeout;

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
	if (dev0)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	/* if device 1 was found in ata_devchk, wait for
	 * register access, then wait for BSY to clear
	 */
	timeout = jiffies + ATA_TMOUT_BOOT;
	while (dev1) {
		u8 nsect, lbal;

		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
2669 2670
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	/* 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);
}

static unsigned int ata_bus_softreset(struct ata_port *ap,
				      unsigned int devmask)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
2695
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
2696 2697

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2698 2699 2700 2701 2702
	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
2703 2704 2705 2706 2707 2708 2709 2710

	/* 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.
2711 2712
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2713 2714 2715
	 */
	msleep(150);

2716
	/* Before we perform post reset processing we want to see if
2717 2718 2719
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2720 2721
	if (ata_check_status(ap) == 0xFF)
		return 0;
2722

L
Linus Torvalds 已提交
2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740
	ata_bus_post_reset(ap, devmask);

	return 0;
}

/**
 *	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
2741
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2742
 *	Obtains host lock.
L
Linus Torvalds 已提交
2743 2744
 *
 *	SIDE EFFECTS:
2745
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2746 2747 2748 2749 2750 2751 2752
 */

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
2753
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2754

T
Tejun Heo 已提交
2755
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775

	/* 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 */
	if (ap->flags & ATA_FLAG_SRST)
T
Tejun Heo 已提交
2776 2777
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2778 2779 2780 2781

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2782
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2783
	if ((slave_possible) && (err != 0x81))
2784
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2785 2786

	/* re-enable interrupts */
2787
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801

	/* 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
2802
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2803 2804 2805 2806 2807 2808
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2809
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2810 2811 2812 2813 2814
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	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
 *	beginning of the stable state.  Because, after hot unplugging,
 *	DET gets stuck at 1 on some controllers, this functions waits
 *	until timeout then returns 0 if DET is stable at 1.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
2834
{
2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 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 2889
	unsigned long interval_msec = params[0];
	unsigned long duration = params[1] * HZ / 1000;
	unsigned long timeout = jiffies + params[2] * HZ / 1000;
	unsigned long last_jiffies;
	u32 last, cur;
	int rc;

	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) {
			if (cur == 1 && time_before(jiffies, timeout))
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

		/* check timeout */
		if (time_after(jiffies, timeout))
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
{
	u32 scontrol;
2890 2891 2892 2893
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2894

2895
	scontrol = (scontrol & 0x0f0) | 0x300;
2896 2897 2898

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2899

2900 2901 2902 2903
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2904

2905
	return sata_phy_debounce(ap, params);
2906 2907
}

2908 2909 2910 2911 2912 2913 2914 2915
static void ata_wait_spinup(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
	unsigned long end, secs;
	int rc;

	/* first, debounce phy if SATA */
	if (ap->cbl == ATA_CBL_SATA) {
2916
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951

		/* if debounced successfully and offline, no need to wait */
		if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
			return;
	}

	/* okay, let's give the drive time to spin up */
	end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
	secs = ((end - jiffies) + HZ - 1) / HZ;

	if (time_after(jiffies, end))
		return;

	if (secs > 5)
		ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
				"(%lu secs)\n", secs);

	schedule_timeout_uninterruptible(end - jiffies);
}

/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
 *
 *	@ap is about to be reset.  Initialize it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_std_prereset(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
2952
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2953 2954
	int rc;

2955 2956 2957 2958 2959 2960 2961 2962
	/* handle link resume & hotplug spinup */
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

	if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
	    (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
		ata_wait_spinup(ap);
2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987

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

	/* if SATA, resume phy */
	if (ap->cbl == ATA_CBL_SATA) {
		rc = sata_phy_resume(ap, timing);
		if (rc && rc != -EOPNOTSUPP) {
			/* phy resume failed */
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"link for reset (errno=%d)\n", rc);
			return 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.
	 */
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	return 0;
}

2988 2989 2990 2991 2992
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2993
 *	Reset host port using ATA SRST.
2994 2995 2996 2997 2998 2999 3000
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3001
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
3002 3003 3004 3005 3006 3007 3008
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

3009
	if (ata_port_offline(ap)) {
3010 3011 3012 3013
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026
	/* 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);
	err_mask = ata_bus_softreset(ap, devmask);
	if (err_mask) {
3027 3028
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
3029 3030 3031 3032 3033 3034 3035 3036
		return -EIO;
	}

	/* 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);

3037
 out:
3038 3039 3040 3041 3042
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3043
 *	sata_port_hardreset - reset port via SATA phy reset
3044
 *	@ap: port to reset
3045
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3046 3047 3048 3049 3050 3051 3052 3053 3054
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3055
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3056
{
3057
	u32 scontrol;
3058
	int rc;
3059

3060 3061
	DPRINTK("ENTER\n");

3062
	if (sata_set_spd_needed(ap)) {
3063 3064 3065 3066 3067
		/* 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.
		 */
3068
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3069
			goto out;
3070

3071
		scontrol = (scontrol & 0x0f0) | 0x304;
3072 3073

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3074
			goto out;
3075

3076
		sata_set_spd(ap);
3077 3078 3079
	}

	/* issue phy wake/reset */
3080
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3081
		goto out;
3082

3083
	scontrol = (scontrol & 0x0f0) | 0x301;
3084 3085

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3086
		goto out;
3087

3088
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3089 3090 3091 3092
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3093
	/* bring phy back */
3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127
	rc = sata_phy_resume(ap, timing);
 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
 *
 *	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.
 */
int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
	rc = sata_port_hardreset(ap, timing);
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3128 3129

	/* TODO: phy layer with polling, timeouts, etc. */
3130
	if (ata_port_offline(ap)) {
3131 3132 3133 3134 3135
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3136 3137 3138
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3139
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3140 3141
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3142 3143 3144
		return -EIO;
	}

3145 3146
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166
	*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)
{
3167 3168
	u32 serror;

3169 3170 3171
	DPRINTK("ENTER\n");

	/* print link status */
3172
	sata_print_link_status(ap);
3173

3174 3175 3176 3177
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3178
	/* re-enable interrupts */
3179 3180
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3181 3182 3183 3184 3185 3186 3187

	/* 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);

3188 3189 3190 3191 3192 3193 3194
	/* 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
3195 3196
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3197 3198 3199 3200

	DPRINTK("EXIT\n");
}

3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216
/**
 *	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
3217 3218
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3219 3220
{
	const u16 *old_id = dev->id;
3221 3222
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3223 3224 3225
	u64 new_n_sectors;

	if (dev->class != new_class) {
3226 3227
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3228 3229 3230
		return 0;
	}

3231 3232 3233 3234
	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]));
3235 3236 3237
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3238 3239
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3240 3241 3242 3243
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3244 3245
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3246 3247 3248 3249
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3250 3251 3252 3253
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3254 3255 3256 3257 3258 3259 3260 3261 3262
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3263
 *	@readid_flags: read ID flags
3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
 *
 *	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
 */
3274
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3275
{
3276
	unsigned int class = dev->class;
3277
	u16 *id = (void *)dev->ap->sector_buf;
3278 3279
	int rc;

3280 3281 3282 3283
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3284

3285
	/* read ID data */
3286
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3287 3288 3289 3290
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3291
	if (!ata_dev_same_device(dev, class, id)) {
3292 3293 3294 3295
		rc = -ENODEV;
		goto fail;
	}

3296
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3297 3298

	/* configure device according to the new ID */
3299
	rc = ata_dev_configure(dev);
3300 3301
	if (rc == 0)
		return 0;
3302 3303

 fail:
3304
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3305 3306 3307
	return rc;
}

3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345
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 },

3346
	/* Weird ATAPI devices */
3347 3348
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |
						ATA_HORKAGE_DMA_RW_ONLY },
3349

3350 3351 3352 3353 3354
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3355 3356
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3357 3358
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3359 3360
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3361 3362 3363 3364 3365
	/* 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, },
3366 3367 3368 3369 3370

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3371
};
3372

3373
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3374
{
T
Tejun Heo 已提交
3375 3376
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3377
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3378

T
Tejun Heo 已提交
3379 3380
	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
3381

3382
	while (ad->model_num) {
T
Tejun Heo 已提交
3383
		if (!strcmp(ad->model_num, model_num)) {
3384 3385
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3386
			if (!strcmp(ad->model_rev, model_rev))
3387
				return ad->horkage;
3388
		}
3389
		ad++;
3390
	}
L
Linus Torvalds 已提交
3391 3392 3393
	return 0;
}

3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405
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;
}

3406 3407 3408 3409
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3410 3411 3412 3413
 *	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...
3414 3415 3416 3417
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3418
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3419
{
T
Tejun Heo 已提交
3420
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3421
	struct ata_host *host = ap->host;
3422
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3423

3424
	/* controller modes available */
3425 3426 3427 3428 3429 3430 3431 3432
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 */
	if (ap->cbl == ATA_CBL_PATA40)
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3433 3434 3435 3436 3437 3438 3439
	/* Apply drive side cable rule. Unknown or 80 pin 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 (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);

L
Linus Torvalds 已提交
3440

3441 3442 3443
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3444

3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455
	/*
	 *	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));
	}

3456 3457
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3458 3459
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3460
	}
3461

3462 3463
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3464 3465 3466
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3467
	}
3468

3469 3470 3471
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3472 3473
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3474 3475 3476 3477 3478 3479
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3480 3481 3482
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3483
 *	LOCKING:
J
Jeff Garzik 已提交
3484
 *	PCI/etc. bus probe sem.
3485 3486 3487
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3488 3489
 */

T
Tejun Heo 已提交
3490
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3491
{
3492
	struct ata_taskfile tf;
3493
	unsigned int err_mask;
L
Linus Torvalds 已提交
3494 3495 3496 3497

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

T
Tejun Heo 已提交
3498
	ata_tf_init(dev, &tf);
3499 3500 3501 3502 3503
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3504

T
Tejun Heo 已提交
3505
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3506

3507 3508
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3509 3510
}

3511 3512 3513
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3514 3515
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3516 3517
 *
 *	LOCKING:
3518 3519 3520 3521
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3522
 */
T
Tejun Heo 已提交
3523 3524
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3525
{
3526
	struct ata_taskfile tf;
3527
	unsigned int err_mask;
3528 3529 3530

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3531
		return AC_ERR_INVALID;
3532 3533 3534 3535

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

T
Tejun Heo 已提交
3536
	ata_tf_init(dev, &tf);
3537 3538 3539 3540 3541
	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 */
3542

T
Tejun Heo 已提交
3543
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3544

3545 3546
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3547 3548
}

L
Linus Torvalds 已提交
3549
/**
J
Jeff Garzik 已提交
3550 3551 3552 3553
 *	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
3554 3555
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3556
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3557
 */
3558
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3559 3560
{
	struct ata_port *ap = qc->ap;
3561
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3562
	int dir = qc->dma_dir;
3563
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3564

3565 3566
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3567 3568

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3569
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3570

J
Jeff Garzik 已提交
3571
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3572

3573 3574 3575 3576 3577 3578 3579 3580
	/* 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) {
3581
		if (qc->n_elem)
3582
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3583 3584 3585 3586 3587 3588
		/* 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);
3589
			kunmap_atomic(addr, KM_IRQ0);
3590 3591
		}
	} else {
3592
		if (qc->n_elem)
3593
			dma_unmap_single(ap->dev,
3594 3595
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3596 3597 3598 3599 3600 3601
		/* 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
3602 3603

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3604
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3605 3606 3607 3608 3609 3610
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3611 3612 3613
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3614
 *	LOCKING:
J
Jeff Garzik 已提交
3615
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3616 3617 3618 3619 3620
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3621 3622
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3623

3624
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3625
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3626 3627

	idx = 0;
3628
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
		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);
}
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
3662 3663 3664 3665
 *	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
3666
 *	LOCKING:
J
Jeff Garzik 已提交
3667
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3668
 *
L
Linus Torvalds 已提交
3669 3670 3671 3672 3673 3674 3675 3676
 *	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;
	int rc = 0; /* Assume ATAPI DMA is OK by default */

3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696
	/* some drives can only do ATAPI DMA on read/write */
	if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
		struct scsi_cmnd *cmd = qc->scsicmd;
		u8 *scsicmd = cmd->cmnd;

		switch (scsicmd[0]) {
		case READ_10:
		case WRITE_10:
		case READ_12:
		case WRITE_12:
		case READ_6:
		case WRITE_6:
			/* atapi dma maybe ok */
			break;
		default:
			/* turn off atapi dma */
			return 1;
		}
	}

L
Linus Torvalds 已提交
3697 3698 3699 3700 3701 3702 3703 3704 3705
	if (ap->ops->check_atapi_dma)
		rc = ap->ops->check_atapi_dma(qc);

	return rc;
}
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
3706 3707
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3708
 *	LOCKING:
J
Jeff Garzik 已提交
3709
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3710 3711 3712 3713 3714 3715 3716 3717 3718
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3719 3720
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
/**
 *	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
3731
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3732 3733
 */

L
Linus Torvalds 已提交
3734 3735 3736 3737
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3738
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3739
	qc->n_elem = 1;
3740
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3741
	qc->buf_virt = buf;
3742
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3743

3744
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3745 3746
}

J
Jeff Garzik 已提交
3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757
/**
 *	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
3758
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3759 3760
 */

L
Linus Torvalds 已提交
3761 3762 3763 3764
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3765
	qc->__sg = sg;
L
Linus Torvalds 已提交
3766
	qc->n_elem = n_elem;
3767
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3768 3769 3770
}

/**
J
Jeff Garzik 已提交
3771 3772 3773 3774
 *	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
3775 3776
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3777
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3778 3779
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3780
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3781 3782 3783 3784 3785 3786
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3787
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3788
	dma_addr_t dma_address;
3789
	int trim_sg = 0;
L
Linus Torvalds 已提交
3790

3791 3792 3793 3794 3795 3796
	/* 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;

3797
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808

		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;
3809 3810
		if (sg->length == 0)
			trim_sg = 1;
3811 3812 3813 3814 3815

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

3816 3817
	if (trim_sg) {
		qc->n_elem--;
3818 3819 3820
		goto skip_map;
	}

3821
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3822
				     sg->length, dir);
3823 3824 3825
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3826
		return -1;
3827
	}
L
Linus Torvalds 已提交
3828 3829

	sg_dma_address(sg) = dma_address;
3830
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3831

3832
skip_map:
L
Linus Torvalds 已提交
3833 3834 3835 3836 3837 3838 3839
	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
3840 3841 3842 3843
 *	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
3844 3845
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3846
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3847 3848
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3849
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3850 3851 3852 3853 3854 3855
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3856 3857
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3858
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3859

T
Tejun Heo 已提交
3860
	VPRINTK("ENTER, ata%u\n", ap->print_id);
3861
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3862

3863 3864 3865 3866 3867 3868 3869
	/* 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;

3870
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884

		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);
3885
			kunmap_atomic(addr, KM_IRQ0);
3886 3887 3888 3889 3890 3891
		}

		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;
3892 3893
		if (lsg->length == 0)
			trim_sg = 1;
3894 3895 3896 3897 3898

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

3899 3900 3901 3902 3903 3904 3905 3906 3907
	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
3908
	dir = qc->dma_dir;
3909
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3910 3911 3912
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3913
		return -1;
3914
	}
L
Linus Torvalds 已提交
3915 3916 3917

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

3918
skip_map:
L
Linus Torvalds 已提交
3919 3920 3921 3922 3923
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3924
/**
3925
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3926 3927 3928 3929 3930 3931 3932 3933
 *	@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
3934
 *	Inherited from caller.
E
Edward Falk 已提交
3935
 */
L
Linus Torvalds 已提交
3936 3937 3938 3939 3940 3941 3942 3943 3944 3945
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
3946
/**
T
Tejun Heo 已提交
3947
 *	ata_data_xfer - Transfer data by PIO
3948
 *	@adev: device to target
A
Albert Lee 已提交
3949 3950
 *	@buf: data buffer
 *	@buflen: buffer length
3951
 *	@write_data: read/write
A
Albert Lee 已提交
3952 3953 3954 3955 3956 3957
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3958 3959
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3960
{
3961
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3962
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3963

A
Albert Lee 已提交
3964
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3965
	if (write_data)
T
Tejun Heo 已提交
3966
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3967
	else
T
Tejun Heo 已提交
3968
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
3969 3970 3971 3972 3973 3974 3975 3976

	/* 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
3977
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
3978
		} else {
T
Tejun Heo 已提交
3979
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
3980 3981 3982
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3983 3984
}

3985
/**
T
Tejun Heo 已提交
3986
 *	ata_data_xfer_noirq - Transfer data by PIO
3987 3988 3989 3990 3991
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3992
 *	Transfer data from/to the device data register by PIO. Do the
3993 3994 3995 3996 3997
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3998 3999
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4000 4001 4002
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4003
	ata_data_xfer(adev, buf, buflen, write_data);
4004 4005 4006 4007
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4008 4009 4010 4011 4012 4013 4014 4015 4016 4017
/**
 *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
 *	@qc: Command on going
 *
 *	Transfer ATA_SECT_SIZE of data from/to the ATA device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4018 4019 4020
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4021
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4022 4023 4024 4025 4026
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
4027
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
4028
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4029 4030

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4031
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4032 4033 4034 4035 4036 4037 4038

	/* 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");

4039 4040 4041
	if (PageHighMem(page)) {
		unsigned long flags;

4042
		/* FIXME: use a bounce buffer */
4043 4044
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4045

4046
		/* do the actual data transfer */
4047
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
4048

4049 4050 4051 4052
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4053
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
4054
	}
L
Linus Torvalds 已提交
4055

T
Tejun Heo 已提交
4056 4057
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
4058

T
Tejun Heo 已提交
4059
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4060 4061 4062 4063 4064
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4065 4066 4067 4068
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
4069
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
4070 4071 4072 4073 4074
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4075

4076 4077 4078 4079 4080 4081
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
4082
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4083

T
Tejun Heo 已提交
4084 4085
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
4086 4087 4088 4089 4090 4091
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107
/**
 *	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");
4108
	WARN_ON(qc->dev->cdb_len < 12);
4109

4110
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125
	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
4126 4127
}

A
Albert Lee 已提交
4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139
/**
 *	__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
4140 4141 4142
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4143
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4144 4145 4146 4147 4148
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4149
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4150
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4151 4152

next_sg:
4153
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4154
		/*
4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165
		 * 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 */
4166 4167
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4168 4169

		for (i = 0; i < words; i++)
4170
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4171

A
Albert Lee 已提交
4172
		ap->hsm_task_state = HSM_ST_LAST;
4173 4174 4175
		return;
	}

4176
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4177 4178 4179 4180 4181 4182 4183 4184

	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;

4185
	/* don't overrun current sg */
4186
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4187 4188 4189 4190

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

4191 4192
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4193 4194 4195
	if (PageHighMem(page)) {
		unsigned long flags;

4196
		/* FIXME: use bounce buffer */
4197 4198
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4199

4200
		/* do the actual data transfer */
4201
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4202

4203 4204 4205 4206
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4207
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4208
	}
L
Linus Torvalds 已提交
4209 4210 4211 4212 4213

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

4214
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4215 4216 4217 4218
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4219
	if (bytes)
L
Linus Torvalds 已提交
4220 4221 4222
		goto next_sg;
}

A
Albert Lee 已提交
4223 4224 4225 4226 4227 4228 4229 4230 4231 4232
/**
 *	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
4233 4234 4235 4236 4237 4238 4239
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;

4240 4241 4242 4243 4244 4245 4246 4247 4248 4249
	/* 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
4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260
	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
4261
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4262

L
Linus Torvalds 已提交
4263 4264 4265 4266 4267
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4268
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4269
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4270
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4271 4272 4273
}

/**
4274 4275 4276
 *	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
4277
 *
4278 4279
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4280
 */
4281 4282

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4283
{
4284 4285
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4286

4287 4288 4289 4290
	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
4291

4292 4293 4294
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4295 4296
	}

4297 4298
	return 0;
}
L
Linus Torvalds 已提交
4299

T
Tejun Heo 已提交
4300 4301 4302 4303 4304 4305 4306 4307
/**
 *	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
4308
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4309 4310 4311 4312 4313 4314 4315 4316 4317
 *	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) {
4318
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4319

J
Jeff Garzik 已提交
4320 4321
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4322 4323 4324 4325
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4326
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4327 4328 4329 4330 4331
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4332
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4333 4334 4335 4336 4337 4338 4339 4340
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4341
			spin_lock_irqsave(ap->lock, flags);
4342
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4343
			ata_qc_complete(qc);
4344
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4345 4346 4347
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4348

4349
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4350 4351
}

4352 4353 4354 4355 4356 4357 4358 4359 4360 4361
/**
 *	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.
 */
4362 4363
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4364
{
4365 4366 4367
	unsigned long flags = 0;
	int poll_next;

4368 4369
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4370 4371 4372 4373
	/* 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).
	 */
4374
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4375

4376
fsm_start:
4377
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4378
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4379

4380 4381
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4382 4383 4384 4385 4386 4387 4388 4389
		/* 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);

4390
		/* check device status */
4391 4392 4393 4394 4395 4396 4397 4398 4399
		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
4400
			ap->hsm_task_state = HSM_ST_ERR;
4401
			goto fsm_start;
L
Linus Torvalds 已提交
4402 4403
		}

4404 4405
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4406 4407 4408
		 * 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.
4409 4410
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4411 4412
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4413
			qc->err_mask |= AC_ERR_HSM;
4414 4415
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4416
		}
L
Linus Torvalds 已提交
4417

4418 4419 4420 4421 4422 4423
		/* 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)
4424
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4425

4426 4427 4428 4429
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4430

4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442
			/* 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)
4443
			spin_unlock_irqrestore(ap->lock, flags);
4444 4445 4446 4447

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4448
		break;
4449

4450 4451 4452 4453 4454
	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) {
4455 4456 4457
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4458 4459 4460
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4461

4462 4463
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4464 4465 4466
			 * 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.
4467 4468
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4469 4470 4471
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4472
				qc->err_mask |= AC_ERR_HSM;
4473 4474
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4475
			}
L
Linus Torvalds 已提交
4476

4477
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4478

4479 4480 4481
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4482

4483 4484 4485 4486
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4487 4488 4489 4490
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4491 4492 4493 4494 4495 4496
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4497

4498 4499 4500
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4501

4502 4503 4504 4505 4506 4507 4508 4509 4510
			/* 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.
4511 4512 4513 4514
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4515 4516 4517 4518 4519 4520 4521

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

4522 4523 4524
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4525 4526 4527 4528 4529 4530
				/* 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;
4531 4532
			}

4533 4534 4535 4536 4537 4538
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4539
				status = ata_wait_idle(ap);
4540 4541 4542 4543 4544
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4545
		poll_next = 1;
L
Linus Torvalds 已提交
4546 4547
		break;

A
Albert Lee 已提交
4548
	case HSM_ST_LAST:
4549 4550
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4551 4552 4553 4554 4555
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4556
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4557
			ap->print_id, qc->dev->devno, status);
4558

4559 4560
		WARN_ON(qc->err_mask);

4561
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4562

4563
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4564
		ata_hsm_qc_complete(qc, in_wq);
4565 4566

		poll_next = 0;
L
Linus Torvalds 已提交
4567 4568
		break;

A
Albert Lee 已提交
4569
	case HSM_ST_ERR:
4570 4571 4572 4573 4574 4575
		/* 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;
4576

4577
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4578
		ata_hsm_qc_complete(qc, in_wq);
4579 4580

		poll_next = 0;
4581 4582
		break;
	default:
4583
		poll_next = 0;
4584
		BUG();
L
Linus Torvalds 已提交
4585 4586
	}

4587
	return poll_next;
L
Linus Torvalds 已提交
4588 4589
}

4590
static void ata_pio_task(struct work_struct *work)
4591
{
4592 4593 4594
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4595
	u8 status;
4596
	int poll_next;
4597

J
Jeff Garzik 已提交
4598
fsm_start:
4599
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4600

4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612
	/*
	 * 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) {
4613
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4614 4615
			return;
		}
4616 4617
	}

4618 4619
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4620

4621 4622 4623 4624
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4625
		goto fsm_start;
4626 4627
}

L
Linus Torvalds 已提交
4628 4629 4630 4631 4632 4633
/**
 *	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
4634
 *	None.
L
Linus Torvalds 已提交
4635 4636 4637 4638 4639 4640 4641
 */

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

4642
	/* no command while frozen */
4643
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4644 4645
		return NULL;

4646 4647
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4648
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4649
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663
			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
4664
 *	None.
L
Linus Torvalds 已提交
4665 4666
 */

T
Tejun Heo 已提交
4667
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4668
{
T
Tejun Heo 已提交
4669
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4670 4671 4672 4673 4674 4675 4676 4677
	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
4678
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691
	}

	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
4692
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4693 4694 4695
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4696 4697 4698
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4699
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4700

4701 4702 4703 4704
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4705
		clear_bit(tag, &ap->qc_allocated);
4706
	}
L
Linus Torvalds 已提交
4707 4708
}

4709
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4710
{
4711 4712
	struct ata_port *ap = qc->ap;

4713 4714
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4715 4716 4717 4718

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

4719
	/* command should be marked inactive atomically with qc completion */
4720 4721 4722 4723
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4724

4725 4726 4727 4728 4729
	/* 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;
4730
	ap->qc_active &= ~(1 << qc->tag);
4731

L
Linus Torvalds 已提交
4732
	/* call completion callback */
4733
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4734 4735
}

4736 4737 4738 4739 4740
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4741
	ap->ops->tf_read(ap, &qc->result_tf);
4742 4743
}

4744 4745 4746 4747 4748 4749 4750 4751 4752
/**
 *	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
4753
 *	spin_lock_irqsave(host lock)
4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772
 */
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) {
4773
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4774 4775 4776 4777 4778 4779 4780

		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 */
4781
				fill_result_tf(qc);
4782 4783 4784 4785 4786 4787 4788
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4789
			fill_result_tf(qc);
4790 4791 4792 4793 4794 4795 4796 4797

		__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)
4798
			fill_result_tf(qc);
4799 4800 4801 4802 4803

		__ata_qc_complete(qc);
	}
}

4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815
/**
 *	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
4816
 *	spin_lock_irqsave(host lock)
4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852
 *
 *	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
4853 4854 4855 4856 4857
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4858
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886
	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
4887
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4888
 */
4889
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4890 4891 4892
{
	struct ata_port *ap = qc->ap;

4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906
	/* 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;
	}

4907
	qc->flags |= ATA_QCFLAG_ACTIVE;
4908
	ap->qc_active |= 1 << qc->tag;
4909

L
Linus Torvalds 已提交
4910 4911 4912
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4913
				goto sg_err;
L
Linus Torvalds 已提交
4914 4915
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4916
				goto sg_err;
L
Linus Torvalds 已提交
4917 4918 4919 4920 4921 4922 4923
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4924 4925 4926 4927
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4928

4929 4930
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4931 4932 4933
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944
}

/**
 *	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
4945 4946
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4947
 *	LOCKING:
J
Jeff Garzik 已提交
4948
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4949 4950
 *
 *	RETURNS:
4951
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4952 4953
 */

4954
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4955 4956 4957
{
	struct ata_port *ap = qc->ap;

4958 4959 4960 4961 4962 4963
	/* 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:
4964
		case ATA_PROT_NODATA:
4965 4966 4967 4968 4969 4970
		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)
4971
				/* see ata_dma_blacklisted() */
4972 4973 4974 4975 4976 4977 4978
				BUG();
			break;
		default:
			break;
		}
	}

4979 4980 4981 4982 4983 4984 4985 4986
	/* Some controllers show flaky interrupt behavior after
	 * setting xfer mode.  Use polling instead.
	 */
	if (unlikely(qc->tf.command == ATA_CMD_SET_FEATURES &&
		     qc->tf.feature == SETFEATURES_XFER) &&
	    (ap->flags & ATA_FLAG_SETXFER_POLLING))
		qc->tf.flags |= ATA_TFLAG_POLLING;

4987
	/* select the device */
L
Linus Torvalds 已提交
4988 4989
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4990
	/* start the command */
L
Linus Torvalds 已提交
4991 4992
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4993 4994 4995
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4996
		ata_tf_to_host(ap, &qc->tf);
4997 4998 4999
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5000
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5001

L
Linus Torvalds 已提交
5002 5003 5004
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5005
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5006

L
Linus Torvalds 已提交
5007 5008 5009
		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 */
5010
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5011 5012
		break;

5013 5014 5015
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5016

J
Jeff Garzik 已提交
5017
		ata_tf_to_host(ap, &qc->tf);
5018

5019 5020 5021
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5022
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5023 5024

			/* always send first data block using
5025
			 * the ata_pio_task() codepath.
5026
			 */
5027
		} else {
5028 5029 5030 5031
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5032
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5033 5034 5035 5036

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5037 5038
		}

L
Linus Torvalds 已提交
5039 5040 5041 5042
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5043 5044 5045
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5046
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5047

5048 5049 5050 5051 5052
		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))
5053
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5054 5055 5056
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5057
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5058

L
Linus Torvalds 已提交
5059 5060
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5061 5062 5063 5064
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5065
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5066 5067 5068 5069
		break;

	default:
		WARN_ON(1);
5070
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085
	}

	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
5086
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5087 5088 5089 5090 5091 5092 5093 5094
 *
 *	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)
{
5095
	struct ata_eh_info *ehi = &ap->eh_info;
5096
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5097

5098
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5099
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5100

5101 5102 5103
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5104 5105 5106
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5107

5108 5109 5110 5111 5112
		/* 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
5113 5114
			goto idle_irq;
		break;
5115 5116 5117 5118 5119
	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
5120 5121
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5122 5123 5124 5125 5126 5127 5128

			/* 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);
5129 5130 5131 5132 5133 5134

			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;
			}
5135 5136 5137 5138
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5139 5140 5141 5142
	default:
		goto idle_irq;
	}

5143 5144 5145 5146
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5147

5148 5149 5150 5151
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5152

5153 5154
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5155

5156
	ata_hsm_move(ap, qc, status, 0);
5157 5158 5159 5160 5161

	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
5162 5163 5164 5165 5166 5167 5168
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5169
		ap->ops->irq_ack(ap, 0); /* debug trap */
5170
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5171
		return 1;
L
Linus Torvalds 已提交
5172 5173 5174 5175 5176 5177 5178
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5179
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5180
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5181
 *
J
Jeff Garzik 已提交
5182 5183 5184
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5185
 *	LOCKING:
J
Jeff Garzik 已提交
5186
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5187 5188
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5189
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5190 5191
 */

5192
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5193
{
J
Jeff Garzik 已提交
5194
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5195 5196 5197 5198 5199
	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
5200
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5201

J
Jeff Garzik 已提交
5202
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5203 5204
		struct ata_port *ap;

J
Jeff Garzik 已提交
5205
		ap = host->ports[i];
5206
		if (ap &&
J
Jeff Garzik 已提交
5207
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5208 5209 5210
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5211
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5212
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5213 5214 5215 5216
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5217
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5218 5219 5220 5221

	return IRQ_RETVAL(handled);
}

5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 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 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358
/**
 *	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)
{
	return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
}

/**
 *	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
5359

5360
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5361
{
5362
	unsigned int err_mask;
J
Jens Axboe 已提交
5363 5364 5365 5366 5367
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5368
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5369 5370 5371 5372
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5373 5374 5375 5376 5377 5378 5379
	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
5380 5381
}

5382
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5383 5384 5385
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5386 5387 5388 5389
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5390 5391
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430

		/* 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
5431 5432
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5433 5434
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5435
 *	Suspend @host.  Actual operation is performed by EH.  This
5436 5437 5438 5439 5440 5441 5442 5443 5444
 *	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
5445
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5446 5447 5448
{
	int i, j, rc;

J
Jeff Garzik 已提交
5449
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5450 5451 5452 5453 5454 5455 5456
	if (rc)
		goto fail;

	/* EH is quiescent now.  Fail if we have any ready device.
	 * This happens if hotplug occurs between completion of device
	 * suspension and here.
	 */
J
Jeff Garzik 已提交
5457 5458
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472

		for (j = 0; j < ATA_MAX_DEVICES; j++) {
			struct ata_device *dev = &ap->device[j];

			if (ata_dev_ready(dev)) {
				ata_port_printk(ap, KERN_WARNING,
						"suspend failed, device %d "
						"still active\n", dev->devno);
				rc = -EBUSY;
				goto fail;
			}
		}
	}

J
Jeff Garzik 已提交
5473
	host->dev->power.power_state = mesg;
5474 5475 5476
	return 0;

 fail:
J
Jeff Garzik 已提交
5477
	ata_host_resume(host);
5478 5479 5480 5481
	return rc;
}

/**
J
Jeff Garzik 已提交
5482 5483
 *	ata_host_resume - resume host
 *	@host: host to resume
5484
 *
J
Jeff Garzik 已提交
5485
 *	Resume @host.  Actual operation is performed by EH.  This
5486 5487 5488 5489 5490 5491
 *	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
5492
void ata_host_resume(struct ata_host *host)
5493
{
J
Jeff Garzik 已提交
5494 5495 5496
	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;
5497
}
5498
#endif
5499

5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511
/**
 *	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.
 */
5512
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5513
{
5514
	struct device *dev = ap->dev;
5515
	int rc;
L
Linus Torvalds 已提交
5516

5517 5518
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5519 5520 5521
	if (!ap->prd)
		return -ENOMEM;

5522
	rc = ata_pad_alloc(ap, dev);
5523
	if (rc)
5524
		return rc;
L
Linus Torvalds 已提交
5525

5526 5527
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5528 5529 5530
	return 0;
}

5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542
/**
 *	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;
5543 5544
	unsigned long flags;

5545 5546 5547
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5548 5549
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5550
	 * host lock.
5551
	 */
5552
	spin_lock_irqsave(ap->lock, flags);
5553
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5554
	spin_unlock_irqrestore(ap->lock, flags);
5555

5556 5557
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5558 5559 5560 5561 5562
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5563
/**
B
Brian King 已提交
5564
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5565
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5566
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5567 5568 5569
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5570
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5571
 *
L
Linus Torvalds 已提交
5572
 *	LOCKING:
J
Jeff Garzik 已提交
5573
 *	Inherited from caller.
L
Linus Torvalds 已提交
5574
 */
J
Jeff Garzik 已提交
5575
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5576
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5577 5578 5579
{
	unsigned int i;

J
Jeff Garzik 已提交
5580
	ap->lock = &host->lock;
5581
	ap->flags = ATA_FLAG_DISABLED;
T
Tejun Heo 已提交
5582
	ap->print_id = ata_print_id++;
L
Linus Torvalds 已提交
5583
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5584
	ap->host = host;
5585
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5586
	ap->port_no = port_no;
5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599
	if (port_no == 1 && ent->pinfo2) {
		ap->pio_mask = ent->pinfo2->pio_mask;
		ap->mwdma_mask = ent->pinfo2->mwdma_mask;
		ap->udma_mask = ent->pinfo2->udma_mask;
		ap->flags |= ent->pinfo2->flags;
		ap->ops = ent->pinfo2->port_ops;
	} else {
		ap->pio_mask = ent->pio_mask;
		ap->mwdma_mask = ent->mwdma_mask;
		ap->udma_mask = ent->udma_mask;
		ap->flags |= ent->port_flags;
		ap->ops = ent->port_ops;
	}
5600
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5601 5602
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5603 5604 5605 5606 5607 5608

#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
5609
#else
5610
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5611
#endif
L
Linus Torvalds 已提交
5612

5613 5614 5615
	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);
5616
	INIT_LIST_HEAD(&ap->eh_done_q);
5617
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5618

5619 5620 5621 5622 5623
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5624 5625
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5626
		dev->ap = ap;
5627
		dev->devno = i;
5628
		ata_dev_init(dev);
5629
	}
L
Linus Torvalds 已提交
5630 5631 5632 5633 5634 5635 5636 5637 5638

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

	memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
}

B
Brian King 已提交
5639
/**
5640 5641 5642
 *	ata_port_init_shost - Initialize SCSI host associated with ATA port
 *	@ap: ATA port to initialize SCSI host for
 *	@shost: SCSI host associated with @ap
B
Brian King 已提交
5643
 *
5644
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5645 5646 5647 5648
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5649
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5650
{
J
Jeff Garzik 已提交
5651
	ap->scsi_host = shost;
B
Brian King 已提交
5652

T
Tejun Heo 已提交
5653
	shost->unique_id = ap->print_id;
5654 5655 5656
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
5657
	shost->max_cmd_len = 16;
B
Brian King 已提交
5658 5659
}

L
Linus Torvalds 已提交
5660
/**
5661
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5662
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5663
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5664 5665
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5666 5667
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5668
 *	LOCKING:
J
Jeff Garzik 已提交
5669
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5670 5671
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5672
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5673
 */
5674
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5675
				      struct ata_host *host,
L
Linus Torvalds 已提交
5676 5677
				      unsigned int port_no)
{
5678
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5679 5680 5681
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5682

5683
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5684
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5685 5686 5687 5688 5689
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5690 5691
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5692 5693
		return NULL;

5694
	shost->transportt = &ata_scsi_transport_template;
5695

5696
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5697

J
Jeff Garzik 已提交
5698
	ata_port_init(ap, host, ent, port_no);
5699
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5700 5701 5702 5703

	return ap;
}

5704 5705 5706 5707 5708 5709 5710 5711
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];

5712
		if (ap && ap->ops->port_stop)
5713 5714 5715 5716 5717
			ap->ops->port_stop(ap);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
5718

5719 5720 5721 5722 5723 5724 5725 5726 5727
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

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

		host->ports[i] = NULL;
	}

5728
	dev_set_drvdata(gendev, NULL);
5729 5730
}

5731
/**
J
Jeff Garzik 已提交
5732 5733 5734 5735 5736
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5737 5738 5739 5740 5741 5742
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5743 5744
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5745
{
J
Jeff Garzik 已提交
5746 5747 5748 5749
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5750 5751
}

L
Linus Torvalds 已提交
5752
/**
J
Jeff Garzik 已提交
5753 5754 5755 5756 5757 5758 5759 5760 5761 5762
 *	ata_device_add - Register hardware device with ATA and SCSI layers
 *	@ent: Probe information describing hardware device to be registered
 *
 *	This function processes the information provided in the probe
 *	information struct @ent, allocates the necessary ATA and SCSI
 *	host information structures, initializes them, and registers
 *	everything with requisite kernel subsystems.
 *
 *	This function requests irqs, probes the ATA bus, and probes
 *	the SCSI bus.
L
Linus Torvalds 已提交
5763 5764
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5765
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5766 5767
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5768
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5769
 */
J
Jeff Garzik 已提交
5770
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5771
{
5772
	unsigned int i;
L
Linus Torvalds 已提交
5773
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5774
	struct ata_host *host;
5775
	int rc;
L
Linus Torvalds 已提交
5776 5777

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5778

5779 5780 5781 5782
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5783 5784 5785 5786

	if (!devres_open_group(dev, ata_device_add, GFP_KERNEL))
		return 0;

L
Linus Torvalds 已提交
5787
	/* alloc a container for our list of ATA ports (buses) */
5788 5789
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5790
	if (!host)
5791 5792 5793
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5794

J
Jeff Garzik 已提交
5795 5796 5797 5798
	ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
	host->n_ports = ent->n_ports;
	host->irq = ent->irq;
	host->irq2 = ent->irq2;
T
Tejun Heo 已提交
5799
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5800
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5801 5802

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5803
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5804 5805
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5806
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5807

J
Jeff Garzik 已提交
5808
		ap = ata_port_add(ent, host, i);
5809
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5810 5811 5812
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5813 5814 5815 5816 5817 5818 5819 5820 5821 5822
		/* dummy? */
		if (ent->dummy_port_mask & (1 << i)) {
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
			ap->ops = &ata_dummy_port_ops;
			continue;
		}

		/* start port */
		rc = ap->ops->port_start(ap);
		if (rc) {
J
Jeff Garzik 已提交
5823 5824
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5825 5826 5827
			goto err_out;
		}

5828 5829 5830 5831
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5832 5833 5834 5835 5836
		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
				(ap->pio_mask << ATA_SHIFT_PIO);

		/* print per-port info to dmesg */
T
Tejun Heo 已提交
5837 5838
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5839 5840 5841 5842 5843
				ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
				ata_mode_string(xfer_mode_mask),
				ap->ioaddr.cmd_addr,
				ap->ioaddr.ctl_addr,
				ap->ioaddr.bmdma_addr,
5844
				irq_line);
L
Linus Torvalds 已提交
5845

5846 5847
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5848 5849
	}

5850
	/* obtain irq, that may be shared between channels */
5851 5852
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5853 5854 5855
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5856
		goto err_out;
5857
	}
L
Linus Torvalds 已提交
5858

5859 5860 5861 5862 5863 5864
	/* do we have a second IRQ for the other channel, eg legacy mode */
	if (ent->irq2) {
		/* We will get weird core code crashes later if this is true
		   so trap it now */
		BUG_ON(ent->irq == ent->irq2);

5865 5866 5867
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5868 5869 5870
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5871
			goto err_out;
5872 5873 5874
		}
	}

5875
	/* resource acquisition complete */
T
Tejun Heo 已提交
5876
	devres_remove_group(dev, ata_device_add);
5877

L
Linus Torvalds 已提交
5878 5879
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5880 5881
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5882
		u32 scontrol;
L
Linus Torvalds 已提交
5883 5884
		int rc;

5885 5886 5887 5888 5889 5890 5891
		/* init sata_spd_limit to the current value */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
			ap->hw_sata_spd_limit &= (1 << spd) - 1;
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

J
Jeff Garzik 已提交
5892
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5893
		if (rc) {
5894
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5895 5896 5897 5898 5899 5900
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5901

5902
		if (ap->ops->error_handler) {
5903
			struct ata_eh_info *ehi = &ap->eh_info;
5904 5905 5906 5907 5908
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5909
			spin_lock_irqsave(ap->lock, flags);
5910

5911 5912 5913
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5914

5915
			ap->pflags |= ATA_PFLAG_LOADING;
5916 5917
			ata_port_schedule_eh(ap);

5918
			spin_unlock_irqrestore(ap->lock, flags);
5919 5920 5921 5922

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
T
Tejun Heo 已提交
5923
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5924
			rc = ata_bus_probe(ap);
T
Tejun Heo 已提交
5925
			DPRINTK("ata%u: bus probe end\n", ap->print_id);
5926 5927 5928 5929 5930 5931 5932 5933 5934 5935

			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.
				 */
			}
		}
L
Linus Torvalds 已提交
5936 5937 5938
	}

	/* probes are done, now scan each port's disk(s) */
5939
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5940 5941
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5942

J
Jeff Garzik 已提交
5943
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5944 5945 5946 5947 5948
	}

	VPRINTK("EXIT, returning %u\n", ent->n_ports);
	return ent->n_ports; /* success */

5949 5950 5951
 err_out:
	devres_release_group(dev, ata_device_add);
	VPRINTK("EXIT, returning %d\n", rc);
L
Linus Torvalds 已提交
5952 5953 5954
	return 0;
}

5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971
/**
 *	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)
5972
		goto skip_eh;
5973 5974

	/* tell EH we're leaving & flush EH */
5975
	spin_lock_irqsave(ap->lock, flags);
5976
	ap->pflags |= ATA_PFLAG_UNLOADING;
5977
	spin_unlock_irqrestore(ap->lock, flags);
5978 5979 5980 5981 5982 5983

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5984
	spin_lock_irqsave(ap->lock, flags);
5985 5986 5987 5988

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

5989
	spin_unlock_irqrestore(ap->lock, flags);
5990 5991 5992 5993 5994

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5995
	spin_lock_irqsave(ap->lock, flags);
5996
	ata_port_freeze(ap);	/* won't be thawed */
5997
	spin_unlock_irqrestore(ap->lock, flags);
5998 5999 6000 6001 6002 6003 6004 6005 6006 6007

	ata_port_wait_eh(ap);

	/* Flush hotplug task.  The sequence is similar to
	 * ata_port_flush_task().
	 */
	flush_workqueue(ata_aux_wq);
	cancel_delayed_work(&ap->hotplug_task);
	flush_workqueue(ata_aux_wq);

6008
 skip_eh:
6009
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6010
	scsi_remove_host(ap->scsi_host);
6011 6012
}

T
Tejun Heo 已提交
6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029
/**
 *	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]);
}

6030 6031 6032 6033 6034
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

6035
	probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
6036 6037 6038 6039 6040 6041 6042 6043 6044 6045
	if (!probe_ent) {
		printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
		       kobject_name(&(dev->kobj)));
		return NULL;
	}

	INIT_LIST_HEAD(&probe_ent->node);
	probe_ent->dev = dev;

	probe_ent->sht = port->sht;
J
Jeff Garzik 已提交
6046
	probe_ent->port_flags = port->flags;
6047 6048 6049 6050
	probe_ent->pio_mask = port->pio_mask;
	probe_ent->mwdma_mask = port->mwdma_mask;
	probe_ent->udma_mask = port->udma_mask;
	probe_ent->port_ops = port->port_ops;
6051
	probe_ent->private_data = port->private_data;
6052 6053 6054 6055

	return probe_ent;
}

L
Linus Torvalds 已提交
6056 6057 6058
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6059 6060 6061 6062 6063 6064 6065
 *
 *	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
6066
 */
E
Edward Falk 已提交
6067

L
Linus Torvalds 已提交
6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081
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
6082

6083 6084
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6085 6086 6087 6088
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6089 6090 6091
 *	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
6092 6093 6094 6095
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6096
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6097 6098
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6099
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6100

T
Tejun Heo 已提交
6101
	ata_host_detach(host);
L
Linus Torvalds 已提交
6102 6103 6104
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6105
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6106 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
{
	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
6137

6138
#ifdef CONFIG_PM
6139
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6140 6141
{
	pci_save_state(pdev);
6142
	pci_disable_device(pdev);
6143

6144
	if (mesg.event == PM_EVENT_SUSPEND)
6145
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6146 6147
}

6148
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6149
{
6150 6151
	int rc;

J
Jens Axboe 已提交
6152 6153
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6154

T
Tejun Heo 已提交
6155
	rc = pcim_enable_device(pdev);
6156 6157 6158 6159 6160 6161
	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
6162
	pci_set_master(pdev);
6163
	return 0;
6164 6165
}

6166
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6167
{
J
Jeff Garzik 已提交
6168
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6169 6170
	int rc = 0;

J
Jeff Garzik 已提交
6171
	rc = ata_host_suspend(host, mesg);
6172 6173 6174
	if (rc)
		return rc;

6175
	ata_pci_device_do_suspend(pdev, mesg);
6176 6177 6178 6179 6180 6181

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6182
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6183
	int rc;
6184

6185 6186 6187 6188
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6189
}
6190 6191
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6192 6193 6194 6195 6196
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6197
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6198 6199 6200 6201
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6202 6203 6204 6205 6206 6207
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6208 6209 6210 6211 6212 6213 6214
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6215
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6216 6217
}

6218
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6219 6220
module_exit(ata_exit);

6221
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6222
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241

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;
}

6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 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 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287
/**
 *	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
6288 6289 6290 6291 6292 6293 6294 6295 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
/*
 * 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,
};

L
Linus Torvalds 已提交
6321 6322 6323 6324 6325 6326 6327
/*
 * 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.
 */

6328 6329 6330
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
6331
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6332 6333
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6334
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6335
EXPORT_SYMBOL_GPL(ata_device_add);
T
Tejun Heo 已提交
6336
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6337 6338
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6339
EXPORT_SYMBOL_GPL(ata_hsm_move);
6340
EXPORT_SYMBOL_GPL(ata_qc_complete);
6341
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6342 6343 6344 6345 6346
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);
6347
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6348 6349 6350 6351 6352 6353 6354
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);
EXPORT_SYMBOL_GPL(ata_interrupt);
T
Tejun Heo 已提交
6355 6356
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6357
EXPORT_SYMBOL_GPL(ata_qc_prep);
6358
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6359 6360 6361 6362 6363
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);
6364 6365 6366 6367 6368
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
6369
EXPORT_SYMBOL_GPL(ata_port_probe);
6370
EXPORT_SYMBOL_GPL(ata_dev_disable);
6371
EXPORT_SYMBOL_GPL(sata_set_spd);
6372 6373
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6374 6375 6376
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6377
EXPORT_SYMBOL_GPL(ata_std_prereset);
6378
EXPORT_SYMBOL_GPL(ata_std_softreset);
6379
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6380 6381
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6382 6383
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6384
EXPORT_SYMBOL_GPL(ata_port_disable);
6385
EXPORT_SYMBOL_GPL(ata_ratelimit);
6386
EXPORT_SYMBOL_GPL(ata_wait_register);
6387
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6388
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6389 6390 6391
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6392
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6393
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6394
EXPORT_SYMBOL_GPL(ata_host_intr);
6395 6396 6397 6398 6399 6400
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);
6401
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6402 6403
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6404
#endif /* CONFIG_PM */
6405 6406
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6407
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6408
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6409 6410
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6411
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6412 6413 6414
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6415 6416 6417 6418 6419
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6420
#ifdef CONFIG_PM
6421 6422
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6423 6424
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6425
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6426 6427
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6428
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6429

6430
#ifdef CONFIG_PM
J
Jens Axboe 已提交
6431 6432
EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6433
#endif /* CONFIG_PM */
6434 6435

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6436 6437
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6438 6439 6440
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6441 6442
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6443
EXPORT_SYMBOL_GPL(ata_do_eh);
6444 6445 6446 6447
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
6448
EXPORT_SYMBOL_GPL(ata_dev_try_classify);