ide-iops.c 34.0 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
/*
 * linux/drivers/ide/ide-iops.c	Version 0.37	Mar 05, 2003
 *
 *  Copyright (C) 2000-2002	Andre Hedrick <andre@linux-ide.org>
 *  Copyright (C) 2003		Red Hat <alan@redhat.com>
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>
26
#include <linux/nmi.h>
L
Linus Torvalds 已提交
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/*
 *	Conventional PIO operations for ATA devices
 */

static u8 ide_inb (unsigned long port)
{
	return (u8) inb(port);
}

static u16 ide_inw (unsigned long port)
{
	return (u16) inw(port);
}

static void ide_insw (unsigned long port, void *addr, u32 count)
{
	insw(port, addr, count);
}

static void ide_insl (unsigned long port, void *addr, u32 count)
{
	insl(port, addr, count);
}

static void ide_outb (u8 val, unsigned long port)
{
	outb(val, port);
}

static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
{
	outb(addr, port);
}

static void ide_outw (u16 val, unsigned long port)
{
	outw(val, port);
}

static void ide_outsw (unsigned long port, void *addr, u32 count)
{
	outsw(port, addr, count);
}

static void ide_outsl (unsigned long port, void *addr, u32 count)
{
	outsl(port, addr, count);
}

void default_hwif_iops (ide_hwif_t *hwif)
{
	hwif->OUTB	= ide_outb;
	hwif->OUTBSYNC	= ide_outbsync;
	hwif->OUTW	= ide_outw;
	hwif->OUTSW	= ide_outsw;
	hwif->OUTSL	= ide_outsl;
	hwif->INB	= ide_inb;
	hwif->INW	= ide_inw;
	hwif->INSW	= ide_insw;
	hwif->INSL	= ide_insl;
}

/*
 *	MMIO operations, typically used for SATA controllers
 */

static u8 ide_mm_inb (unsigned long port)
{
	return (u8) readb((void __iomem *) port);
}

static u16 ide_mm_inw (unsigned long port)
{
	return (u16) readw((void __iomem *) port);
}

static void ide_mm_insw (unsigned long port, void *addr, u32 count)
{
	__ide_mm_insw((void __iomem *) port, addr, count);
}

static void ide_mm_insl (unsigned long port, void *addr, u32 count)
{
	__ide_mm_insl((void __iomem *) port, addr, count);
}

static void ide_mm_outb (u8 value, unsigned long port)
{
	writeb(value, (void __iomem *) port);
}

static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
{
	writeb(value, (void __iomem *) port);
}

static void ide_mm_outw (u16 value, unsigned long port)
{
	writew(value, (void __iomem *) port);
}

static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
{
	__ide_mm_outsw((void __iomem *) port, addr, count);
}

static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
{
	__ide_mm_outsl((void __iomem *) port, addr, count);
}

void default_hwif_mmiops (ide_hwif_t *hwif)
{
	hwif->OUTB	= ide_mm_outb;
	/* Most systems will need to override OUTBSYNC, alas however
	   this one is controller specific! */
	hwif->OUTBSYNC	= ide_mm_outbsync;
	hwif->OUTW	= ide_mm_outw;
	hwif->OUTSW	= ide_mm_outsw;
	hwif->OUTSL	= ide_mm_outsl;
	hwif->INB	= ide_mm_inb;
	hwif->INW	= ide_mm_inw;
	hwif->INSW	= ide_mm_insw;
	hwif->INSL	= ide_mm_insl;
}

EXPORT_SYMBOL(default_hwif_mmiops);

u32 ide_read_24 (ide_drive_t *drive)
{
	u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
	u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
	u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
	return (hcyl<<16)|(lcyl<<8)|sect;
}

void SELECT_DRIVE (ide_drive_t *drive)
{
	if (HWIF(drive)->selectproc)
		HWIF(drive)->selectproc(drive);
	HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
}

EXPORT_SYMBOL(SELECT_DRIVE);

void SELECT_INTERRUPT (ide_drive_t *drive)
{
	if (HWIF(drive)->intrproc)
		HWIF(drive)->intrproc(drive);
	else
		HWIF(drive)->OUTB(drive->ctl|2, IDE_CONTROL_REG);
}

void SELECT_MASK (ide_drive_t *drive, int mask)
{
	if (HWIF(drive)->maskproc)
		HWIF(drive)->maskproc(drive, mask);
}

void QUIRK_LIST (ide_drive_t *drive)
{
	if (HWIF(drive)->quirkproc)
		drive->quirk_list = HWIF(drive)->quirkproc(drive);
}

/*
 * Some localbus EIDE interfaces require a special access sequence
 * when using 32-bit I/O instructions to transfer data.  We call this
 * the "vlb_sync" sequence, which consists of three successive reads
 * of the sector count register location, with interrupts disabled
 * to ensure that the reads all happen together.
 */
static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
{
	(void) HWIF(drive)->INB(port);
	(void) HWIF(drive)->INB(port);
	(void) HWIF(drive)->INB(port);
}

/*
 * This is used for most PIO data transfers *from* the IDE interface
 */
static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 io_32bit		= drive->io_32bit;

	if (io_32bit) {
		if (io_32bit & 2) {
			unsigned long flags;
			local_irq_save(flags);
			ata_vlb_sync(drive, IDE_NSECTOR_REG);
			hwif->INSL(IDE_DATA_REG, buffer, wcount);
			local_irq_restore(flags);
		} else
			hwif->INSL(IDE_DATA_REG, buffer, wcount);
	} else {
		hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
	}
}

/*
 * This is used for most PIO data transfers *to* the IDE interface
 */
static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 io_32bit		= drive->io_32bit;

	if (io_32bit) {
		if (io_32bit & 2) {
			unsigned long flags;
			local_irq_save(flags);
			ata_vlb_sync(drive, IDE_NSECTOR_REG);
			hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
			local_irq_restore(flags);
		} else
			hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
	} else {
		hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
	}
}

/*
 * The following routines are mainly used by the ATAPI drivers.
 *
 * These routines will round up any request for an odd number of bytes,
 * so if an odd bytecount is specified, be sure that there's at least one
 * extra byte allocated for the buffer.
 */

static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
{
	ide_hwif_t *hwif = HWIF(drive);

	++bytecount;
#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
	if (MACH_IS_ATARI || MACH_IS_Q40) {
		/* Atari has a byte-swapped IDE interface */
		insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
		return;
	}
#endif /* CONFIG_ATARI || CONFIG_Q40 */
	hwif->ata_input_data(drive, buffer, bytecount / 4);
	if ((bytecount & 0x03) >= 2)
		hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
}

static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
{
	ide_hwif_t *hwif = HWIF(drive);

	++bytecount;
#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
	if (MACH_IS_ATARI || MACH_IS_Q40) {
		/* Atari has a byte-swapped IDE interface */
		outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
		return;
	}
#endif /* CONFIG_ATARI || CONFIG_Q40 */
	hwif->ata_output_data(drive, buffer, bytecount / 4);
	if ((bytecount & 0x03) >= 2)
		hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
}

void default_hwif_transport(ide_hwif_t *hwif)
{
	hwif->ata_input_data		= ata_input_data;
	hwif->ata_output_data		= ata_output_data;
	hwif->atapi_input_bytes		= atapi_input_bytes;
	hwif->atapi_output_bytes	= atapi_output_bytes;
}

/*
 * Beginning of Taskfile OPCODE Library and feature sets.
 */
void ide_fix_driveid (struct hd_driveid *id)
{
#ifndef __LITTLE_ENDIAN
# ifdef __BIG_ENDIAN
	int i;
	u16 *stringcast;

	id->config         = __le16_to_cpu(id->config);
	id->cyls           = __le16_to_cpu(id->cyls);
	id->reserved2      = __le16_to_cpu(id->reserved2);
	id->heads          = __le16_to_cpu(id->heads);
	id->track_bytes    = __le16_to_cpu(id->track_bytes);
	id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
	id->sectors        = __le16_to_cpu(id->sectors);
	id->vendor0        = __le16_to_cpu(id->vendor0);
	id->vendor1        = __le16_to_cpu(id->vendor1);
	id->vendor2        = __le16_to_cpu(id->vendor2);
	stringcast = (u16 *)&id->serial_no[0];
	for (i = 0; i < (20/2); i++)
		stringcast[i] = __le16_to_cpu(stringcast[i]);
	id->buf_type       = __le16_to_cpu(id->buf_type);
	id->buf_size       = __le16_to_cpu(id->buf_size);
	id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
	stringcast = (u16 *)&id->fw_rev[0];
	for (i = 0; i < (8/2); i++)
		stringcast[i] = __le16_to_cpu(stringcast[i]);
	stringcast = (u16 *)&id->model[0];
	for (i = 0; i < (40/2); i++)
		stringcast[i] = __le16_to_cpu(stringcast[i]);
	id->dword_io       = __le16_to_cpu(id->dword_io);
	id->reserved50     = __le16_to_cpu(id->reserved50);
	id->field_valid    = __le16_to_cpu(id->field_valid);
	id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
	id->cur_heads      = __le16_to_cpu(id->cur_heads);
	id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
	id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
	id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
	id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
	id->dma_1word      = __le16_to_cpu(id->dma_1word);
	id->dma_mword      = __le16_to_cpu(id->dma_mword);
	id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
	id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
	id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
	id->eide_pio       = __le16_to_cpu(id->eide_pio);
	id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
	for (i = 0; i < 2; ++i)
		id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
	for (i = 0; i < 4; ++i)
		id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
	id->queue_depth    = __le16_to_cpu(id->queue_depth);
	for (i = 0; i < 4; ++i)
		id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
	id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
	id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
	id->command_set_1  = __le16_to_cpu(id->command_set_1);
	id->command_set_2  = __le16_to_cpu(id->command_set_2);
	id->cfsse          = __le16_to_cpu(id->cfsse);
	id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
	id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
	id->csf_default    = __le16_to_cpu(id->csf_default);
	id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
	id->trseuc         = __le16_to_cpu(id->trseuc);
	id->trsEuc         = __le16_to_cpu(id->trsEuc);
	id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
	id->mprc           = __le16_to_cpu(id->mprc);
	id->hw_config      = __le16_to_cpu(id->hw_config);
	id->acoustic       = __le16_to_cpu(id->acoustic);
	id->msrqs          = __le16_to_cpu(id->msrqs);
	id->sxfert         = __le16_to_cpu(id->sxfert);
	id->sal            = __le16_to_cpu(id->sal);
	id->spg            = __le32_to_cpu(id->spg);
	id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
	for (i = 0; i < 22; i++)
		id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
	id->last_lun       = __le16_to_cpu(id->last_lun);
	id->word127        = __le16_to_cpu(id->word127);
	id->dlf            = __le16_to_cpu(id->dlf);
	id->csfo           = __le16_to_cpu(id->csfo);
	for (i = 0; i < 26; i++)
		id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
	id->word156        = __le16_to_cpu(id->word156);
	for (i = 0; i < 3; i++)
		id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
	id->cfa_power      = __le16_to_cpu(id->cfa_power);
	for (i = 0; i < 14; i++)
		id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
	for (i = 0; i < 31; i++)
		id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
	for (i = 0; i < 48; i++)
		id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
	id->integrity_word  = __le16_to_cpu(id->integrity_word);
# else
#  error "Please fix <asm/byteorder.h>"
# endif
#endif
}

/* FIXME: exported for use by the USB storage (isd200.c) code only */
EXPORT_SYMBOL(ide_fix_driveid);

void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
{
	u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */

	if (byteswap) {
		/* convert from big-endian to host byte order */
		for (p = end ; p != s;) {
			unsigned short *pp = (unsigned short *) (p -= 2);
			*pp = ntohs(*pp);
		}
	}
	/* strip leading blanks */
	while (s != end && *s == ' ')
		++s;
	/* compress internal blanks and strip trailing blanks */
	while (s != end && *s) {
		if (*s++ != ' ' || (s != end && *s && *s != ' '))
			*p++ = *(s-1);
	}
	/* wipe out trailing garbage */
	while (p != end)
		*p++ = '\0';
}

EXPORT_SYMBOL(ide_fixstring);

/*
 * Needed for PCI irq sharing
 */
int drive_is_ready (ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 stat			= 0;

	if (drive->waiting_for_dma)
		return hwif->ide_dma_test_irq(drive);

#if 0
	/* need to guarantee 400ns since last command was issued */
	udelay(1);
#endif

#ifdef CONFIG_IDEPCI_SHARE_IRQ
	/*
	 * We do a passive status test under shared PCI interrupts on
	 * cards that truly share the ATA side interrupt, but may also share
	 * an interrupt with another pci card/device.  We make no assumptions
	 * about possible isa-pnp and pci-pnp issues yet.
	 */
	if (IDE_CONTROL_REG)
		stat = hwif->INB(IDE_ALTSTATUS_REG);
	else
#endif /* CONFIG_IDEPCI_SHARE_IRQ */
		/* Note: this may clear a pending IRQ!! */
		stat = hwif->INB(IDE_STATUS_REG);

	if (stat & BUSY_STAT)
		/* drive busy:  definitely not interrupting */
		return 0;

	/* drive ready: *might* be interrupting */
	return 1;
}

EXPORT_SYMBOL(drive_is_ready);

/*
 * Global for All, and taken from ide-pmac.c. Can be called
 * with spinlock held & IRQs disabled, so don't schedule !
 */
int wait_for_ready (ide_drive_t *drive, int timeout)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 stat			= 0;

	while(--timeout) {
		stat = hwif->INB(IDE_STATUS_REG);
		if (!(stat & BUSY_STAT)) {
			if (drive->ready_stat == 0)
				break;
			else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
				break;
		}
		mdelay(1);
	}
	if ((stat & ERR_STAT) || timeout <= 0) {
		if (stat & ERR_STAT) {
			printk(KERN_ERR "%s: wait_for_ready, "
				"error status: %x\n", drive->name, stat);
		}
		return 1;
	}
	return 0;
}

/*
 * This routine busy-waits for the drive status to be not "busy".
 * It then checks the status for all of the "good" bits and none
 * of the "bad" bits, and if all is okay it returns 0.  All other
 * cases return 1 after invoking ide_error() -- caller should just return.
 *
 * This routine should get fixed to not hog the cpu during extra long waits..
 * That could be done by busy-waiting for the first jiffy or two, and then
 * setting a timer to wake up at half second intervals thereafter,
 * until timeout is achieved, before timing out.
 */
int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
{
	ide_hwif_t *hwif = HWIF(drive);
	u8 stat;
	int i;
	unsigned long flags;
 
	/* bail early if we've exceeded max_failures */
	if (drive->max_failures && (drive->failures > drive->max_failures)) {
		*startstop = ide_stopped;
		return 1;
	}

	udelay(1);	/* spec allows drive 400ns to assert "BUSY" */
	if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
		local_irq_set(flags);
		timeout += jiffies;
		while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
			if (time_after(jiffies, timeout)) {
				/*
				 * One last read after the timeout in case
				 * heavy interrupt load made us not make any
				 * progress during the timeout..
				 */
				stat = hwif->INB(IDE_STATUS_REG);
				if (!(stat & BUSY_STAT))
					break;

				local_irq_restore(flags);
				*startstop = ide_error(drive, "status timeout", stat);
				return 1;
			}
		}
		local_irq_restore(flags);
	}
	/*
	 * Allow status to settle, then read it again.
	 * A few rare drives vastly violate the 400ns spec here,
	 * so we'll wait up to 10usec for a "good" status
	 * rather than expensively fail things immediately.
	 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
	 */
	for (i = 0; i < 10; i++) {
		udelay(1);
		if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
			return 0;
	}
	*startstop = ide_error(drive, "status error", stat);
	return 1;
}

EXPORT_SYMBOL(ide_wait_stat);

/*
 *  All hosts that use the 80c ribbon must use!
 *  The name is derived from upper byte of word 93 and the 80c ribbon.
 */
u8 eighty_ninty_three (ide_drive_t *drive)
{
574 575 576
	ide_hwif_t *hwif = drive->hwif;
	struct hd_driveid *id = drive->id;

577 578 579 580
	if (hwif->cbl == ATA_CBL_PATA40_SHORT)
		return 1;

	if (hwif->cbl != ATA_CBL_PATA80)
581
		goto no_80w;
582 583

	/* Check for SATA but only if we are ATA5 or higher */
584
	if (id->hw_config == 0 && (id->major_rev_num & 0x7FE0))
585
		return 1;
586

587 588 589 590 591 592
	/*
	 * FIXME:
	 * - change master/slave IDENTIFY order
	 * - force bit13 (80c cable present) check
	 *   (unless the slave device is pre-ATA3)
	 */
593 594 595 596 597 598 599 600 601 602 603 604 605
#ifndef CONFIG_IDEDMA_IVB
	if (id->hw_config & 0x4000)
#else
	if (id->hw_config & 0x6000)
#endif
		return 1;

no_80w:
	if (drive->udma33_warned == 1)
		return 0;

	printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
			    "limiting max speed to UDMA33\n",
606 607
			    drive->name,
			    hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
608 609 610 611

	drive->udma33_warned = 1;

	return 0;
L
Linus Torvalds 已提交
612 613 614 615 616 617 618
}

int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
{
	if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
	    (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
	    (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
619 620 621
		if (eighty_ninty_three(drive) == 0) {
			printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
					    "be set\n", drive->name);
L
Linus Torvalds 已提交
622 623 624
			return 1;
		}
	}
625

L
Linus Torvalds 已提交
626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
	return 0;
}

/*
 * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 * 1 : Safe to update drive->id DMA registers.
 * 0 : OOPs not allowed.
 */
int set_transfer (ide_drive_t *drive, ide_task_t *args)
{
	if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
	    (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
	    (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
	    (drive->id->dma_ultra ||
	     drive->id->dma_mword ||
	     drive->id->dma_1word))
		return 1;

	return 0;
}

#ifdef CONFIG_BLK_DEV_IDEDMA
static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
{
	if (!drive->crc_count)
		return drive->current_speed;
	drive->crc_count = 0;

	switch(drive->current_speed) {
		case XFER_UDMA_7:	return XFER_UDMA_6;
		case XFER_UDMA_6:	return XFER_UDMA_5;
		case XFER_UDMA_5:	return XFER_UDMA_4;
		case XFER_UDMA_4:	return XFER_UDMA_3;
		case XFER_UDMA_3:	return XFER_UDMA_2;
		case XFER_UDMA_2:	return XFER_UDMA_1;
		case XFER_UDMA_1:	return XFER_UDMA_0;
			/*
			 * OOPS we do not goto non Ultra DMA modes
			 * without iCRC's available we force
			 * the system to PIO and make the user
			 * invoke the ATA-1 ATA-2 DMA modes.
			 */
		case XFER_UDMA_0:
		default:		return XFER_PIO_4;
	}
}
#endif /* CONFIG_BLK_DEV_IDEDMA */

/*
 * Update the 
 */
int ide_driveid_update (ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct hd_driveid *id;
#if 0
	id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
	if (!id)
		return 0;

	taskfile_lib_get_identify(drive, (char *)&id);

	ide_fix_driveid(id);
	if (id) {
		drive->id->dma_ultra = id->dma_ultra;
		drive->id->dma_mword = id->dma_mword;
		drive->id->dma_1word = id->dma_1word;
		/* anything more ? */
		kfree(id);
	}
	return 1;
#else
	/*
	 * Re-read drive->id for possible DMA mode
	 * change (copied from ide-probe.c)
	 */
	unsigned long timeout, flags;

	SELECT_MASK(drive, 1);
	if (IDE_CONTROL_REG)
		hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
	msleep(50);
	hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
	timeout = jiffies + WAIT_WORSTCASE;
	do {
		if (time_after(jiffies, timeout)) {
			SELECT_MASK(drive, 0);
			return 0;	/* drive timed-out */
		}
		msleep(50);	/* give drive a breather */
	} while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
	msleep(50);	/* wait for IRQ and DRQ_STAT */
	if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
		SELECT_MASK(drive, 0);
		printk("%s: CHECK for good STATUS\n", drive->name);
		return 0;
	}
	local_irq_save(flags);
	SELECT_MASK(drive, 0);
	id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
	if (!id) {
		local_irq_restore(flags);
		return 0;
	}
	ata_input_data(drive, id, SECTOR_WORDS);
	(void) hwif->INB(IDE_STATUS_REG);	/* clear drive IRQ */
	local_irq_enable();
	local_irq_restore(flags);
	ide_fix_driveid(id);
	if (id) {
		drive->id->dma_ultra = id->dma_ultra;
		drive->id->dma_mword = id->dma_mword;
		drive->id->dma_1word = id->dma_1word;
		/* anything more ? */
		kfree(id);
	}

	return 1;
#endif
}

/*
 * Similar to ide_wait_stat(), except it never calls ide_error internally.
 * This is a kludge to handle the new ide_config_drive_speed() function,
 * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 * should be updated to return ide_startstop_t, in which case we can get
 * rid of this abomination again.  :)   -ml
 *
 * It is gone..........
 *
 * const char *msg == consider adding for verbose errors.
 */
int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
{
	ide_hwif_t *hwif	= HWIF(drive);
	int	i, error	= 1;
	u8 stat;

//	while (HWGROUP(drive)->busy)
//		msleep(50);

#ifdef CONFIG_BLK_DEV_IDEDMA
	if (hwif->ide_dma_check)	 /* check if host supports DMA */
769
		hwif->dma_host_off(drive);
L
Linus Torvalds 已提交
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
#endif

	/*
	 * Don't use ide_wait_cmd here - it will
	 * attempt to set_geometry and recalibrate,
	 * but for some reason these don't work at
	 * this point (lost interrupt).
	 */
        /*
         * Select the drive, and issue the SETFEATURES command
         */
	disable_irq_nosync(hwif->irq);
	
	/*
	 *	FIXME: we race against the running IRQ here if
	 *	this is called from non IRQ context. If we use
	 *	disable_irq() we hang on the error path. Work
	 *	is needed.
	 */
	 
	udelay(1);
	SELECT_DRIVE(drive);
	SELECT_MASK(drive, 0);
	udelay(1);
	if (IDE_CONTROL_REG)
		hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
	hwif->OUTB(speed, IDE_NSECTOR_REG);
	hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
	hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
	if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
		hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
	udelay(1);
	/*
	 * Wait for drive to become non-BUSY
	 */
	if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
		unsigned long flags, timeout;
		local_irq_set(flags);
		timeout = jiffies + WAIT_CMD;
		while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
			if (time_after(jiffies, timeout))
				break;
		}
		local_irq_restore(flags);
	}

	/*
	 * Allow status to settle, then read it again.
	 * A few rare drives vastly violate the 400ns spec here,
	 * so we'll wait up to 10usec for a "good" status
	 * rather than expensively fail things immediately.
	 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
	 */
	for (i = 0; i < 10; i++) {
		udelay(1);
		if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
			error = 0;
			break;
		}
	}

	SELECT_MASK(drive, 0);

	enable_irq(hwif->irq);

	if (error) {
		(void) ide_dump_status(drive, "set_drive_speed_status", stat);
		return error;
	}

	drive->id->dma_ultra &= ~0xFF00;
	drive->id->dma_mword &= ~0x0F00;
	drive->id->dma_1word &= ~0x0F00;

#ifdef CONFIG_BLK_DEV_IDEDMA
	if (speed >= XFER_SW_DMA_0)
846
		hwif->dma_host_on(drive);
L
Linus Torvalds 已提交
847
	else if (hwif->ide_dma_check)	/* check if host supports DMA */
848
		hwif->dma_off_quietly(drive);
L
Linus Torvalds 已提交
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
#endif

	switch(speed) {
		case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
		case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
		case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
		case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
		case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
		case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
		case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
		case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
		case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
		case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
		case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
		case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
		case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
		case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
		default: break;
	}
	if (!drive->init_speed)
		drive->init_speed = speed;
	drive->current_speed = speed;
	return error;
}

EXPORT_SYMBOL(ide_config_drive_speed);


/*
 * This should get invoked any time we exit the driver to
 * wait for an interrupt response from a drive.  handler() points
 * at the appropriate code to handle the next interrupt, and a
 * timer is started to prevent us from waiting forever in case
 * something goes wrong (see the ide_timer_expiry() handler later on).
 *
 * See also ide_execute_command
 */
static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
		      unsigned int timeout, ide_expiry_t *expiry)
{
	ide_hwgroup_t *hwgroup = HWGROUP(drive);

	if (hwgroup->handler != NULL) {
		printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
			"old=%p, new=%p\n",
			drive->name, hwgroup->handler, handler);
	}
	hwgroup->handler	= handler;
	hwgroup->expiry		= expiry;
	hwgroup->timer.expires	= jiffies + timeout;
899
	hwgroup->req_gen_timer = hwgroup->req_gen;
L
Linus Torvalds 已提交
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
	add_timer(&hwgroup->timer);
}

void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
		      unsigned int timeout, ide_expiry_t *expiry)
{
	unsigned long flags;
	spin_lock_irqsave(&ide_lock, flags);
	__ide_set_handler(drive, handler, timeout, expiry);
	spin_unlock_irqrestore(&ide_lock, flags);
}

EXPORT_SYMBOL(ide_set_handler);
 
/**
 *	ide_execute_command	-	execute an IDE command
 *	@drive: IDE drive to issue the command against
 *	@command: command byte to write
 *	@handler: handler for next phase
 *	@timeout: timeout for command
 *	@expiry:  handler to run on timeout
 *
 *	Helper function to issue an IDE command. This handles the
 *	atomicity requirements, command timing and ensures that the 
 *	handler and IRQ setup do not race. All IDE command kick off
 *	should go via this function or do equivalent locking.
 */
 
void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
{
	unsigned long flags;
	ide_hwgroup_t *hwgroup = HWGROUP(drive);
	ide_hwif_t *hwif = HWIF(drive);
	
	spin_lock_irqsave(&ide_lock, flags);
	
E
Eric Sesterhenn 已提交
936
	BUG_ON(hwgroup->handler);
L
Linus Torvalds 已提交
937 938 939
	hwgroup->handler	= handler;
	hwgroup->expiry		= expiry;
	hwgroup->timer.expires	= jiffies + timeout;
940
	hwgroup->req_gen_timer = hwgroup->req_gen;
L
Linus Torvalds 已提交
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977
	add_timer(&hwgroup->timer);
	hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
	/* Drive takes 400nS to respond, we must avoid the IRQ being
	   serviced before that. 
	   
	   FIXME: we could skip this delay with care on non shared
	   devices 
	*/
	ndelay(400);
	spin_unlock_irqrestore(&ide_lock, flags);
}

EXPORT_SYMBOL(ide_execute_command);


/* needed below */
static ide_startstop_t do_reset1 (ide_drive_t *, int);

/*
 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 * during an atapi drive reset operation. If the drive has not yet responded,
 * and we have not yet hit our maximum waiting time, then the timer is restarted
 * for another 50ms.
 */
static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
{
	ide_hwgroup_t *hwgroup	= HWGROUP(drive);
	ide_hwif_t *hwif	= HWIF(drive);
	u8 stat;

	SELECT_DRIVE(drive);
	udelay (10);

	if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
		printk("%s: ATAPI reset complete\n", drive->name);
	} else {
		if (time_before(jiffies, hwgroup->poll_timeout)) {
E
Eric Sesterhenn 已提交
978
			BUG_ON(HWGROUP(drive)->handler != NULL);
L
Linus Torvalds 已提交
979 980 981 982 983 984 985 986 987 988 989 990 991
			ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
			/* continue polling */
			return ide_started;
		}
		/* end of polling */
		hwgroup->polling = 0;
		printk("%s: ATAPI reset timed-out, status=0x%02x\n",
				drive->name, stat);
		/* do it the old fashioned way */
		return do_reset1(drive, 1);
	}
	/* done polling */
	hwgroup->polling = 0;
992
	hwgroup->resetting = 0;
L
Linus Torvalds 已提交
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
	return ide_stopped;
}

/*
 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 * during an ide reset operation. If the drives have not yet responded,
 * and we have not yet hit our maximum waiting time, then the timer is restarted
 * for another 50ms.
 */
static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
{
	ide_hwgroup_t *hwgroup	= HWGROUP(drive);
	ide_hwif_t *hwif	= HWIF(drive);
	u8 tmp;

	if (hwif->reset_poll != NULL) {
		if (hwif->reset_poll(drive)) {
			printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
				hwif->name, drive->name);
			return ide_stopped;
		}
	}

	if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
		if (time_before(jiffies, hwgroup->poll_timeout)) {
E
Eric Sesterhenn 已提交
1018
			BUG_ON(HWGROUP(drive)->handler != NULL);
L
Linus Torvalds 已提交
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
			ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
			/* continue polling */
			return ide_started;
		}
		printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
		drive->failures++;
	} else  {
		printk("%s: reset: ", hwif->name);
		if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
			printk("success\n");
			drive->failures = 0;
		} else {
			drive->failures++;
			printk("master: ");
			switch (tmp & 0x7f) {
				case 1: printk("passed");
					break;
				case 2: printk("formatter device error");
					break;
				case 3: printk("sector buffer error");
					break;
				case 4: printk("ECC circuitry error");
					break;
				case 5: printk("controlling MPU error");
					break;
				default:printk("error (0x%02x?)", tmp);
			}
			if (tmp & 0x80)
				printk("; slave: failed");
			printk("\n");
		}
	}
	hwgroup->polling = 0;	/* done polling */
1052
	hwgroup->resetting = 0; /* done reset attempt */
L
Linus Torvalds 已提交
1053 1054 1055 1056 1057 1058 1059
	return ide_stopped;
}

static void check_dma_crc(ide_drive_t *drive)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
	if (drive->crc_count) {
1060
		drive->hwif->dma_off_quietly(drive);
L
Linus Torvalds 已提交
1061 1062 1063 1064
		ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
		if (drive->current_speed >= XFER_SW_DMA_0)
			(void) HWIF(drive)->ide_dma_on(drive);
	} else
1065
		ide_dma_off(drive);
L
Linus Torvalds 已提交
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
#endif
}

static void ide_disk_pre_reset(ide_drive_t *drive)
{
	int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;

	drive->special.all = 0;
	drive->special.b.set_geometry = legacy;
	drive->special.b.recalibrate  = legacy;
	if (OK_TO_RESET_CONTROLLER)
		drive->mult_count = 0;
	if (!drive->keep_settings && !drive->using_dma)
		drive->mult_req = 0;
	if (drive->mult_req != drive->mult_count)
		drive->special.b.set_multmode = 1;
}

static void pre_reset(ide_drive_t *drive)
{
	if (drive->media == ide_disk)
		ide_disk_pre_reset(drive);
	else
		drive->post_reset = 1;

	if (!drive->keep_settings) {
		if (drive->using_dma) {
			check_dma_crc(drive);
		} else {
			drive->unmask = 0;
			drive->io_32bit = 0;
		}
		return;
	}
	if (drive->using_dma)
		check_dma_crc(drive);

	if (HWIF(drive)->pre_reset != NULL)
		HWIF(drive)->pre_reset(drive);

1106 1107 1108
	if (drive->current_speed != 0xff)
		drive->desired_speed = drive->current_speed;
	drive->current_speed = 0xff;
L
Linus Torvalds 已提交
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
}

/*
 * do_reset1() attempts to recover a confused drive by resetting it.
 * Unfortunately, resetting a disk drive actually resets all devices on
 * the same interface, so it can really be thought of as resetting the
 * interface rather than resetting the drive.
 *
 * ATAPI devices have their own reset mechanism which allows them to be
 * individually reset without clobbering other devices on the same interface.
 *
 * Unfortunately, the IDE interface does not generate an interrupt to let
 * us know when the reset operation has finished, so we must poll for this.
 * Equally poor, though, is the fact that this may a very long time to complete,
 * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
 * we set a timer to poll at 50ms intervals.
 */
static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
{
	unsigned int unit;
	unsigned long flags;
	ide_hwif_t *hwif;
	ide_hwgroup_t *hwgroup;
	
	spin_lock_irqsave(&ide_lock, flags);
	hwif = HWIF(drive);
	hwgroup = HWGROUP(drive);

	/* We must not reset with running handlers */
E
Eric Sesterhenn 已提交
1138
	BUG_ON(hwgroup->handler != NULL);
L
Linus Torvalds 已提交
1139 1140 1141

	/* For an ATAPI device, first try an ATAPI SRST. */
	if (drive->media != ide_disk && !do_not_try_atapi) {
1142
		hwgroup->resetting = 1;
L
Linus Torvalds 已提交
1143 1144 1145
		pre_reset(drive);
		SELECT_DRIVE(drive);
		udelay (20);
1146 1147
		hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
		ndelay(400);
L
Linus Torvalds 已提交
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
		hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
		hwgroup->polling = 1;
		__ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
		spin_unlock_irqrestore(&ide_lock, flags);
		return ide_started;
	}

	/*
	 * First, reset any device state data we were maintaining
	 * for any of the drives on this interface.
	 */
	for (unit = 0; unit < MAX_DRIVES; ++unit)
		pre_reset(&hwif->drives[unit]);

#if OK_TO_RESET_CONTROLLER
	if (!IDE_CONTROL_REG) {
		spin_unlock_irqrestore(&ide_lock, flags);
		return ide_stopped;
	}

1168
	hwgroup->resetting = 1;
L
Linus Torvalds 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
	/*
	 * Note that we also set nIEN while resetting the device,
	 * to mask unwanted interrupts from the interface during the reset.
	 * However, due to the design of PC hardware, this will cause an
	 * immediate interrupt due to the edge transition it produces.
	 * This single interrupt gives us a "fast poll" for drives that
	 * recover from reset very quickly, saving us the first 50ms wait time.
	 */
	/* set SRST and nIEN */
	hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
	/* more than enough time */
	udelay(10);
	if (drive->quirk_list == 2) {
		/* clear SRST and nIEN */
		hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
	} else {
		/* clear SRST, leave nIEN */
		hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
	}
	/* more than enough time */
	udelay(10);
	hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
	hwgroup->polling = 1;
	__ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);

	/*
	 * Some weird controller like resetting themselves to a strange
	 * state when the disks are reset this way. At least, the Winbond
	 * 553 documentation says that
	 */
	if (hwif->resetproc != NULL) {
		hwif->resetproc(drive);
	}
	
#endif	/* OK_TO_RESET_CONTROLLER */

	spin_unlock_irqrestore(&ide_lock, flags);
	return ide_started;
}

/*
 * ide_do_reset() is the entry point to the drive/interface reset code.
 */

ide_startstop_t ide_do_reset (ide_drive_t *drive)
{
	return do_reset1(drive, 0);
}

EXPORT_SYMBOL(ide_do_reset);

/*
 * ide_wait_not_busy() waits for the currently selected device on the hwif
 * to report a non-busy status, see comments in probe_hwif().
 */
int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
{
	u8 stat = 0;

	while(timeout--) {
		/*
		 * Turn this into a schedule() sleep once I'm sure
		 * about locking issues (2.5 work ?).
		 */
		mdelay(1);
		stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
		if ((stat & BUSY_STAT) == 0)
			return 0;
		/*
		 * Assume a value of 0xff means nothing is connected to
		 * the interface and it doesn't implement the pull-down
		 * resistor on D7.
		 */
		if (stat == 0xff)
			return -ENODEV;
1244
		touch_softlockup_watchdog();
1245
		touch_nmi_watchdog();
L
Linus Torvalds 已提交
1246 1247 1248 1249 1250 1251
	}
	return -EBUSY;
}

EXPORT_SYMBOL_GPL(ide_wait_not_busy);