ide-probe.c 37.7 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2 3
 *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
 *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
Linus Torvalds's avatar
Linus Torvalds committed
4 5 6 7 8 9 10 11 12 13 14
 */

/*
 *  Mostly written by Mark Lord <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the IDE probe module, as evolved from hd.c and ide.c.
 *
15 16
 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
 *	 by Andrea Arcangeli
Linus Torvalds's avatar
Linus Torvalds committed
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
 */

#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/slab.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/spinlock.h>
#include <linux/kmod.h>
#include <linux/pci.h>
FUJITA Tomonori's avatar
FUJITA Tomonori committed
35
#include <linux/scatterlist.h>
Linus Torvalds's avatar
Linus Torvalds committed
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

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

/**
 *	generic_id		-	add a generic drive id
 *	@drive:	drive to make an ID block for
 *	
 *	Add a fake id field to the drive we are passed. This allows
 *	use to skip a ton of NULL checks (which people always miss) 
 *	and make drive properties unconditional outside of this file
 */
 
static void generic_id(ide_drive_t *drive)
{
	drive->id->cyls = drive->cyl;
	drive->id->heads = drive->head;
	drive->id->sectors = drive->sect;
	drive->id->cur_cyls = drive->cyl;
	drive->id->cur_heads = drive->head;
	drive->id->cur_sectors = drive->sect;
}

static void ide_disk_init_chs(ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;

	/* Extract geometry if we did not already have one for the drive */
	if (!drive->cyl || !drive->head || !drive->sect) {
		drive->cyl  = drive->bios_cyl  = id->cyls;
		drive->head = drive->bios_head = id->heads;
		drive->sect = drive->bios_sect = id->sectors;
	}

	/* Handle logical geometry translation by the drive */
	if ((id->field_valid & 1) && id->cur_cyls &&
	    id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
		drive->cyl  = id->cur_cyls;
		drive->head = id->cur_heads;
		drive->sect = id->cur_sectors;
	}

	/* Use physical geometry if what we have still makes no sense */
	if (drive->head > 16 && id->heads && id->heads <= 16) {
		drive->cyl  = id->cyls;
		drive->head = id->heads;
		drive->sect = id->sectors;
	}
}

static void ide_disk_init_mult_count(ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;

	drive->mult_count = 0;
	if (id->max_multsect) {
#ifdef CONFIG_IDEDISK_MULTI_MODE
		id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
		id->multsect_valid = id->multsect ? 1 : 0;
97
		drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
Linus Torvalds's avatar
Linus Torvalds committed
98 99
		drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
#else	/* original, pre IDE-NFG, per request of AC */
100
		drive->mult_req = 0;
Linus Torvalds's avatar
Linus Torvalds committed
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
		if (drive->mult_req > id->max_multsect)
			drive->mult_req = id->max_multsect;
		if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
			drive->special.b.set_multmode = 1;
#endif
	}
}

/**
 *	do_identify	-	identify a drive
 *	@drive: drive to identify 
 *	@cmd: command used
 *
 *	Called when we have issued a drive identify command to
 *	read and parse the results. This function is run with
 *	interrupts disabled. 
 */
 
static inline void do_identify (ide_drive_t *drive, u8 cmd)
{
	ide_hwif_t *hwif = HWIF(drive);
	int bswap = 1;
	struct hd_driveid *id;

	id = drive->id;
	/* read 512 bytes of id info */
	hwif->ata_input_data(drive, id, SECTOR_WORDS);

	drive->id_read = 1;
	local_irq_enable();
131 132 133 134
#ifdef DEBUG
	printk(KERN_INFO "%s: dumping identify data\n", drive->name);
	ide_dump_identify((u8 *)id);
#endif
Linus Torvalds's avatar
Linus Torvalds committed
135 136
	ide_fix_driveid(id);

137
#if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
Linus Torvalds's avatar
Linus Torvalds committed
138 139 140 141 142 143 144 145 146
	/*
	 * EATA SCSI controllers do a hardware ATA emulation:
	 * Ignore them if there is a driver for them available.
	 */
	if ((id->model[0] == 'P' && id->model[1] == 'M') ||
	    (id->model[0] == 'S' && id->model[1] == 'K')) {
		printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
		goto err_misc;
	}
147
#endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
Linus Torvalds's avatar
Linus Torvalds committed
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163

	/*
	 *  WIN_IDENTIFY returns little-endian info,
	 *  WIN_PIDENTIFY *usually* returns little-endian info.
	 */
	if (cmd == WIN_PIDENTIFY) {
		if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
		 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
		 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
			/* Vertos drives may still be weird */
			bswap ^= 1;	
	}
	ide_fixstring(id->model,     sizeof(id->model),     bswap);
	ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
	ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);

164 165 166
	/* we depend on this a lot! */
	id->model[sizeof(id->model)-1] = '\0';

Linus Torvalds's avatar
Linus Torvalds committed
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
	if (strstr(id->model, "E X A B Y T E N E S T"))
		goto err_misc;

	printk("%s: %s, ", drive->name, id->model);
	drive->present = 1;
	drive->dead = 0;

	/*
	 * Check for an ATAPI device
	 */
	if (cmd == WIN_PIDENTIFY) {
		u8 type = (id->config >> 8) & 0x1f;
		printk("ATAPI ");
		switch (type) {
			case ide_floppy:
				if (!strstr(id->model, "CD-ROM")) {
					if (!strstr(id->model, "oppy") &&
					    !strstr(id->model, "poyp") &&
					    !strstr(id->model, "ZIP"))
						printk("cdrom or floppy?, assuming ");
					if (drive->media != ide_cdrom) {
						printk ("FLOPPY");
						drive->removable = 1;
						break;
					}
				}
				/* Early cdrom models used zero */
				type = ide_cdrom;
			case ide_cdrom:
				drive->removable = 1;
#ifdef CONFIG_PPC
				/* kludge for Apple PowerBook internal zip */
				if (!strstr(id->model, "CD-ROM") &&
				    strstr(id->model, "ZIP")) {
					printk ("FLOPPY");
					type = ide_floppy;
					break;
				}
#endif
				printk ("CD/DVD-ROM");
				break;
			case ide_tape:
				printk ("TAPE");
				break;
			case ide_optical:
				printk ("OPTICAL");
				drive->removable = 1;
				break;
			default:
				printk("UNKNOWN (type %d)", type);
				break;
		}
		printk (" drive\n");
		drive->media = type;
		/* an ATAPI device ignores DRDY */
		drive->ready_stat = 0;
		return;
	}

	/*
	 * Not an ATAPI device: looks like a "regular" hard disk
	 */
229 230 231 232 233 234 235

	/*
	 * 0x848a = CompactFlash device
	 * These are *not* removable in Linux definition of the term
	 */

	if ((id->config != 0x848a) && (id->config & (1<<7)))
Linus Torvalds's avatar
Linus Torvalds committed
236 237 238
		drive->removable = 1;

	drive->media = ide_disk;
239
	printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
240

Linus Torvalds's avatar
Linus Torvalds committed
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
	return;

err_misc:
	kfree(id);
	drive->present = 0;
	return;
}

/**
 *	actual_try_to_identify	-	send ata/atapi identify
 *	@drive: drive to identify
 *	@cmd: command to use
 *
 *	try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 *	and waits for a response.  It also monitors irqs while this is
 *	happening, in hope of automatically determining which one is
 *	being used by the interface.
 *
 *	Returns:	0  device was identified
 *			1  device timed-out (no response to identify request)
 *			2  device aborted the command (refused to identify itself)
 */

static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
{
	ide_hwif_t *hwif = HWIF(drive);
267
	int use_altstatus = 0, rc;
Linus Torvalds's avatar
Linus Torvalds committed
268 269 270 271 272 273
	unsigned long timeout;
	u8 s = 0, a = 0;

	/* take a deep breath */
	msleep(50);

274
	if (hwif->io_ports[IDE_CONTROL_OFFSET]) {
275 276 277
		a = ide_read_altstatus(drive);
		s = ide_read_status(drive);
		if ((a ^ s) & ~INDEX_STAT)
Linus Torvalds's avatar
Linus Torvalds committed
278
			/* ancient Seagate drives, broken interfaces */
279 280 281 282
			printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
					 "instead of ALTSTATUS(0x%02x)\n",
					 drive->name, s, a);
		else
Linus Torvalds's avatar
Linus Torvalds committed
283
			/* use non-intrusive polling */
284 285
			use_altstatus = 1;
	}
Linus Torvalds's avatar
Linus Torvalds committed
286 287 288 289 290 291

	/* set features register for atapi
	 * identify command to be sure of reply
	 */
	if ((cmd == WIN_PIDENTIFY))
		/* disable dma & overlap */
292
		hwif->OUTB(0, hwif->io_ports[IDE_FEATURE_OFFSET]);
Linus Torvalds's avatar
Linus Torvalds committed
293 294

	/* ask drive for ID */
295
	hwif->OUTB(cmd, hwif->io_ports[IDE_COMMAND_OFFSET]);
Linus Torvalds's avatar
Linus Torvalds committed
296 297 298 299 300 301 302 303 304 305

	timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
	timeout += jiffies;
	do {
		if (time_after(jiffies, timeout)) {
			/* drive timed-out */
			return 1;
		}
		/* give drive a breather */
		msleep(50);
306 307 308
		s = use_altstatus ? ide_read_altstatus(drive)
				  : ide_read_status(drive);
	} while (s & BUSY_STAT);
Linus Torvalds's avatar
Linus Torvalds committed
309 310 311

	/* wait for IRQ and DRQ_STAT */
	msleep(50);
312 313 314
	s = ide_read_status(drive);

	if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
Linus Torvalds's avatar
Linus Torvalds committed
315 316 317 318 319 320 321 322 323
		unsigned long flags;

		/* local CPU only; some systems need this */
		local_irq_save(flags);
		/* drive returned ID */
		do_identify(drive, cmd);
		/* drive responded with ID */
		rc = 0;
		/* clear drive IRQ */
324
		(void)ide_read_status(drive);
Linus Torvalds's avatar
Linus Torvalds committed
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
		local_irq_restore(flags);
	} else {
		/* drive refused ID */
		rc = 2;
	}
	return rc;
}

/**
 *	try_to_identify	-	try to identify a drive
 *	@drive: drive to probe
 *	@cmd: command to use
 *
 *	Issue the identify command and then do IRQ probing to
 *	complete the identification when needed by finding the
 *	IRQ the drive is attached to
 */
 
static int try_to_identify (ide_drive_t *drive, u8 cmd)
{
	ide_hwif_t *hwif = HWIF(drive);
	int retval;
	int autoprobe = 0;
	unsigned long cookie = 0;

	/*
	 * Disable device irq unless we need to
	 * probe for it. Otherwise we'll get spurious
	 * interrupts during the identify-phase that
	 * the irq handler isn't expecting.
	 */
356
	if (hwif->io_ports[IDE_CONTROL_OFFSET]) {
Linus Torvalds's avatar
Linus Torvalds committed
357 358 359 360
		if (!hwif->irq) {
			autoprobe = 1;
			cookie = probe_irq_on();
		}
361
		ide_set_irq(drive, autoprobe);
Linus Torvalds's avatar
Linus Torvalds committed
362 363 364 365 366 367
	}

	retval = actual_try_to_identify(drive, cmd);

	if (autoprobe) {
		int irq;
368 369

		ide_set_irq(drive, 0);
Linus Torvalds's avatar
Linus Torvalds committed
370
		/* clear drive IRQ */
371
		(void)ide_read_status(drive);
Linus Torvalds's avatar
Linus Torvalds committed
372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388
		udelay(5);
		irq = probe_irq_off(cookie);
		if (!hwif->irq) {
			if (irq > 0) {
				hwif->irq = irq;
			} else {
				/* Mmmm.. multiple IRQs..
				 * don't know which was ours
				 */
				printk("%s: IRQ probe failed (0x%lx)\n",
					drive->name, cookie);
			}
		}
	}
	return retval;
}

389 390 391 392 393 394 395 396 397 398 399 400 401 402
static int ide_busy_sleep(ide_hwif_t *hwif)
{
	unsigned long timeout = jiffies + WAIT_WORSTCASE;
	u8 stat;

	do {
		msleep(50);
		stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
		if ((stat & BUSY_STAT) == 0)
			return 0;
	} while (time_before(jiffies, timeout));

	return 1;
}
Linus Torvalds's avatar
Linus Torvalds committed
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

/**
 *	do_probe		-	probe an IDE device
 *	@drive: drive to probe
 *	@cmd: command to use
 *
 *	do_probe() has the difficult job of finding a drive if it exists,
 *	without getting hung up if it doesn't exist, without trampling on
 *	ethernet cards, and without leaving any IRQs dangling to haunt us later.
 *
 *	If a drive is "known" to exist (from CMOS or kernel parameters),
 *	but does not respond right away, the probe will "hang in there"
 *	for the maximum wait time (about 30 seconds), otherwise it will
 *	exit much more quickly.
 *
 * Returns:	0  device was identified
 *		1  device timed-out (no response to identify request)
 *		2  device aborted the command (refused to identify itself)
 *		3  bad status from device (possible for ATAPI drives)
 *		4  probe was not attempted because failure was obvious
 */

static int do_probe (ide_drive_t *drive, u8 cmd)
{
	ide_hwif_t *hwif = HWIF(drive);
428 429
	int rc;
	u8 stat;
Linus Torvalds's avatar
Linus Torvalds committed
430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447

	if (drive->present) {
		/* avoid waiting for inappropriate probes */
		if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
			return 4;
	}
#ifdef DEBUG
	printk("probing for %s: present=%d, media=%d, probetype=%s\n",
		drive->name, drive->present, drive->media,
		(cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
#endif

	/* needed for some systems
	 * (e.g. crw9624 as drive0 with disk as slave)
	 */
	msleep(50);
	SELECT_DRIVE(drive);
	msleep(50);
448 449
	if (hwif->INB(hwif->io_ports[IDE_SELECT_OFFSET]) != drive->select.all &&
	    !drive->present) {
Linus Torvalds's avatar
Linus Torvalds committed
450 451 452 453 454 455 456 457 458 459
		if (drive->select.b.unit != 0) {
			/* exit with drive0 selected */
			SELECT_DRIVE(&hwif->drives[0]);
			/* allow BUSY_STAT to assert & clear */
			msleep(50);
		}
		/* no i/f present: mmm.. this should be a 4 -ml */
		return 3;
	}

460 461 462
	stat = ide_read_status(drive);

	if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
Linus Torvalds's avatar
Linus Torvalds committed
463 464 465 466 467 468
	    drive->present || cmd == WIN_PIDENTIFY) {
		/* send cmd and wait */
		if ((rc = try_to_identify(drive, cmd))) {
			/* failed: try again */
			rc = try_to_identify(drive,cmd);
		}
469

470
		stat = ide_read_status(drive);
471 472

		if (stat == (BUSY_STAT | READY_STAT))
Linus Torvalds's avatar
Linus Torvalds committed
473 474 475 476 477
			return 4;

		if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
			((drive->autotune == IDE_TUNE_DEFAULT) ||
			(drive->autotune == IDE_TUNE_AUTO))) {
478 479
			printk(KERN_ERR "%s: no response (status = 0x%02x), "
					"resetting drive\n", drive->name, stat);
Linus Torvalds's avatar
Linus Torvalds committed
480
			msleep(50);
481 482
			hwif->OUTB(drive->select.all,
				   hwif->io_ports[IDE_SELECT_OFFSET]);
Linus Torvalds's avatar
Linus Torvalds committed
483
			msleep(50);
484 485
			hwif->OUTB(WIN_SRST,
				   hwif->io_ports[IDE_COMMAND_OFFSET]);
486
			(void)ide_busy_sleep(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
487 488
			rc = try_to_identify(drive, cmd);
		}
489 490

		/* ensure drive IRQ is clear */
491
		stat = ide_read_status(drive);
492

Linus Torvalds's avatar
Linus Torvalds committed
493
		if (rc == 1)
494 495
			printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
					drive->name, stat);
Linus Torvalds's avatar
Linus Torvalds committed
496 497 498 499 500 501 502 503 504
	} else {
		/* not present or maybe ATAPI */
		rc = 3;
	}
	if (drive->select.b.unit != 0) {
		/* exit with drive0 selected */
		SELECT_DRIVE(&hwif->drives[0]);
		msleep(50);
		/* ensure drive irq is clear */
505
		(void)ide_read_status(drive);
Linus Torvalds's avatar
Linus Torvalds committed
506 507 508 509 510 511 512 513 514 515
	}
	return rc;
}

/*
 *
 */
static void enable_nest (ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
516
	u8 stat;
Linus Torvalds's avatar
Linus Torvalds committed
517 518 519 520

	printk("%s: enabling %s -- ", hwif->name, drive->id->model);
	SELECT_DRIVE(drive);
	msleep(50);
521
	hwif->OUTB(EXABYTE_ENABLE_NEST, hwif->io_ports[IDE_COMMAND_OFFSET]);
522 523 524 525 526

	if (ide_busy_sleep(hwif)) {
		printk(KERN_CONT "failed (timeout)\n");
		return;
	}
Linus Torvalds's avatar
Linus Torvalds committed
527 528 529

	msleep(50);

530
	stat = ide_read_status(drive);
531 532 533 534 535

	if (!OK_STAT(stat, 0, BAD_STAT))
		printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
	else
		printk(KERN_CONT "success\n");
Linus Torvalds's avatar
Linus Torvalds committed
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

	/* if !(success||timed-out) */
	if (do_probe(drive, WIN_IDENTIFY) >= 2) {
		/* look for ATAPI device */
		(void) do_probe(drive, WIN_PIDENTIFY);
	}
}

/**
 *	probe_for_drives	-	upper level drive probe
 *	@drive: drive to probe for
 *
 *	probe_for_drive() tests for existence of a given drive using do_probe()
 *	and presents things to the user as needed.
 *
 *	Returns:	0  no device was found
 *			1  device was found (note: drive->present might
 *			   still be 0)
 */
 
static inline u8 probe_for_drive (ide_drive_t *drive)
{
	/*
	 *	In order to keep things simple we have an id
	 *	block for all drives at all times. If the device
	 *	is pre ATA or refuses ATA/ATAPI identify we
	 *	will add faked data to this.
	 *
	 *	Also note that 0 everywhere means "can't do X"
	 */
 
567
	drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
	drive->id_read = 0;
	if(drive->id == NULL)
	{
		printk(KERN_ERR "ide: out of memory for id data.\n");
		return 0;
	}
	strcpy(drive->id->model, "UNKNOWN");
	
	/* skip probing? */
	if (!drive->noprobe)
	{
		/* if !(success||timed-out) */
		if (do_probe(drive, WIN_IDENTIFY) >= 2) {
			/* look for ATAPI device */
			(void) do_probe(drive, WIN_PIDENTIFY);
		}
		if (!drive->present)
			/* drive not found */
			return 0;
Alan Cox's avatar
Alan Cox committed
587 588
		if (strstr(drive->id->model, "E X A B Y T E N E S T"))
			enable_nest(drive);
Linus Torvalds's avatar
Linus Torvalds committed
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
	
		/* identification failed? */
		if (!drive->id_read) {
			if (drive->media == ide_disk) {
				printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
					drive->name, drive->cyl,
					drive->head, drive->sect);
			} else if (drive->media == ide_cdrom) {
				printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
			} else {
				/* nuke it */
				printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
				drive->present = 0;
			}
		}
		/* drive was found */
	}
	if(!drive->present)
		return 0;
	/* The drive wasn't being helpful. Add generic info only */
	if (drive->id_read == 0) {
		generic_id(drive);
		return 1;
	}

	if (drive->media == ide_disk) {
		ide_disk_init_chs(drive);
		ide_disk_init_mult_count(drive);
	}

	return drive->present;
}

static void hwif_release_dev (struct device *dev)
{
	ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);

626
	complete(&hwif->gendev_rel_comp);
Linus Torvalds's avatar
Linus Torvalds committed
627 628
}

629
static int ide_register_port(ide_hwif_t *hwif)
Linus Torvalds's avatar
Linus Torvalds committed
630
{
631 632
	int ret;

Linus Torvalds's avatar
Linus Torvalds committed
633 634 635 636
	/* register with global device tree */
	strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
	hwif->gendev.driver_data = hwif;
	if (hwif->gendev.parent == NULL) {
637 638
		if (hwif->dev)
			hwif->gendev.parent = hwif->dev;
Linus Torvalds's avatar
Linus Torvalds committed
639 640 641 642 643
		else
			/* Would like to do = &device_legacy */
			hwif->gendev.parent = NULL;
	}
	hwif->gendev.release = hwif_release_dev;
644
	ret = device_register(&hwif->gendev);
645
	if (ret < 0) {
646 647
		printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
			__FUNCTION__, ret);
648 649 650 651 652 653 654 655 656 657 658 659 660 661
		goto out;
	}

	get_device(&hwif->gendev);

	hwif->portdev = device_create(ide_port_class, &hwif->gendev,
				      MKDEV(0, 0), hwif->name);
	if (IS_ERR(hwif->portdev)) {
		ret = PTR_ERR(hwif->portdev);
		device_unregister(&hwif->gendev);
	}
	dev_set_drvdata(hwif->portdev, hwif);
out:
	return ret;
Linus Torvalds's avatar
Linus Torvalds committed
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
/**
 *	ide_port_wait_ready	-	wait for port to become ready
 *	@hwif: IDE port
 *
 *	This is needed on some PPCs and a bunch of BIOS-less embedded
 *	platforms.  Typical cases are:
 *
 *	- The firmware hard reset the disk before booting the kernel,
 *	  the drive is still doing it's poweron-reset sequence, that
 *	  can take up to 30 seconds.
 *
 *	- The firmware does nothing (or no firmware), the device is
 *	  still in POST state (same as above actually).
 *
 *	- Some CD/DVD/Writer combo drives tend to drive the bus during
 *	  their reset sequence even when they are non-selected slave
 *	  devices, thus preventing discovery of the main HD.
 *
 *	Doing this wait-for-non-busy should not harm any existing
 *	configuration and fix some issues like the above.
 *
 *	BenH.
 *
 *	Returns 0 on success, error code (< 0) otherwise.
 */

static int ide_port_wait_ready(ide_hwif_t *hwif)
Linus Torvalds's avatar
Linus Torvalds committed
691
{
692
	int unit, rc;
Linus Torvalds's avatar
Linus Torvalds committed
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708

	printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);

	/* Let HW settle down a bit from whatever init state we
	 * come from */
	mdelay(2);

	/* Wait for BSY bit to go away, spec timeout is 30 seconds,
	 * I know of at least one disk who takes 31 seconds, I use 35
	 * here to be safe
	 */
	rc = ide_wait_not_busy(hwif, 35000);
	if (rc)
		return rc;

	/* Now make sure both master & slave are ready */
709 710 711 712 713 714
	for (unit = 0; unit < MAX_DRIVES; unit++) {
		ide_drive_t *drive = &hwif->drives[unit];

		/* Ignore disks that we will not probe for later. */
		if (!drive->noprobe || drive->present) {
			SELECT_DRIVE(drive);
715
			ide_set_irq(drive, 1);
716 717 718 719 720 721 722 723 724
			mdelay(2);
			rc = ide_wait_not_busy(hwif, 35000);
			if (rc)
				goto out;
		} else
			printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
					  drive->name);
	}
out:
Linus Torvalds's avatar
Linus Torvalds committed
725
	/* Exit function with master reselected (let's be sane) */
726 727 728
	if (unit)
		SELECT_DRIVE(&hwif->drives[0]);

Linus Torvalds's avatar
Linus Torvalds committed
729 730 731 732 733
	return rc;
}

/**
 *	ide_undecoded_slave	-	look for bad CF adapters
734
 *	@drive1: drive
Linus Torvalds's avatar
Linus Torvalds committed
735 736 737 738 739 740
 *
 *	Analyse the drives on the interface and attempt to decide if we
 *	have the same drive viewed twice. This occurs with crap CF adapters
 *	and PCMCIA sometimes.
 */

741
void ide_undecoded_slave(ide_drive_t *drive1)
Linus Torvalds's avatar
Linus Torvalds committed
742
{
743
	ide_drive_t *drive0 = &drive1->hwif->drives[0];
Linus Torvalds's avatar
Linus Torvalds committed
744

745
	if ((drive1->dn & 1) == 0 || drive0->present == 0)
Linus Torvalds's avatar
Linus Torvalds committed
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
		return;

	/* If the models don't match they are not the same product */
	if (strcmp(drive0->id->model, drive1->id->model))
		return;

	/* Serial numbers do not match */
	if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
		return;

	/* No serial number, thankfully very rare for CF */
	if (drive0->id->serial_no[0] == 0)
		return;

	/* Appears to be an IDE flash adapter with decode bugs */
	printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");

	drive1->present = 0;
}

EXPORT_SYMBOL_GPL(ide_undecoded_slave);

768
static int ide_probe_port(ide_hwif_t *hwif)
Linus Torvalds's avatar
Linus Torvalds committed
769 770 771
{
	unsigned long flags;
	unsigned int irqd;
772 773 774
	int unit, rc = -ENODEV;

	BUG_ON(hwif->present);
Linus Torvalds's avatar
Linus Torvalds committed
775

776 777
	if (hwif->noprobe ||
	    (hwif->drives[0].noprobe && hwif->drives[1].noprobe))
778
		return -EACCES;
Linus Torvalds's avatar
Linus Torvalds committed
779 780 781 782 783 784 785 786 787 788 789

	/*
	 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
	 * we'll install our IRQ driver much later...
	 */
	irqd = hwif->irq;
	if (irqd)
		disable_irq(hwif->irq);

	local_irq_set(flags);

790
	if (ide_port_wait_ready(hwif) == -EBUSY)
Linus Torvalds's avatar
Linus Torvalds committed
791 792 793
		printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);

	/*
794 795
	 * Second drive should only exist if first drive was found,
	 * but a lot of cdrom drives are configured as single slaves.
Linus Torvalds's avatar
Linus Torvalds committed
796
	 */
797
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
Linus Torvalds's avatar
Linus Torvalds committed
798 799 800
		ide_drive_t *drive = &hwif->drives[unit];
		drive->dn = (hwif->channel ? 2 : 0) + unit;
		(void) probe_for_drive(drive);
801 802
		if (drive->present)
			rc = 0;
Linus Torvalds's avatar
Linus Torvalds committed
803 804 805 806 807 808
	}
	if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
		printk(KERN_WARNING "%s: reset\n", hwif->name);
		hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
		udelay(10);
		hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
809
		(void)ide_busy_sleep(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
810 811 812 813 814 815 816 817 818
	}
	local_irq_restore(flags);
	/*
	 * Use cached IRQ number. It might be (and is...) changed by probe
	 * code above
	 */
	if (irqd)
		enable_irq(irqd);

819
	return rc;
820 821 822 823 824 825
}

static void ide_port_tune_devices(ide_hwif_t *hwif)
{
	int unit;

826 827 828 829 830 831
	for (unit = 0; unit < MAX_DRIVES; unit++) {
		ide_drive_t *drive = &hwif->drives[unit];

		if (drive->present && hwif->quirkproc)
			hwif->quirkproc(drive);
	}
832

Linus Torvalds's avatar
Linus Torvalds committed
833 834 835 836
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		ide_drive_t *drive = &hwif->drives[unit];

		if (drive->present) {
837 838
			if (drive->autotune == IDE_TUNE_AUTO)
				ide_set_max_pio(drive);
Linus Torvalds's avatar
Linus Torvalds committed
839 840 841 842 843 844 845

			if (drive->autotune != IDE_TUNE_DEFAULT &&
			    drive->autotune != IDE_TUNE_AUTO)
				continue;

			drive->nice1 = 1;

846
			if (hwif->dma_host_set)
847
				ide_set_dma(drive);
Linus Torvalds's avatar
Linus Torvalds committed
848 849
		}
	}
850 851 852 853

	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		ide_drive_t *drive = &hwif->drives[unit];

854
		if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
855 856 857 858
			drive->no_io_32bit = 1;
		else
			drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
	}
Linus Torvalds's avatar
Linus Torvalds committed
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
}

#if MAX_HWIFS > 1
/*
 * save_match() is used to simplify logic in init_irq() below.
 *
 * A loophole here is that we may not know about a particular
 * hwif's irq until after that hwif is actually probed/initialized..
 * This could be a problem for the case where an hwif is on a
 * dual interface that requires serialization (eg. cmd640) and another
 * hwif using one of the same irqs is initialized beforehand.
 *
 * This routine detects and reports such situations, but does not fix them.
 */
static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
{
	ide_hwif_t *m = *match;

	if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
		if (!new->hwgroup)
			return;
		printk("%s: potential irq problem with %s and %s\n",
			hwif->name, new->name, m->name);
	}
	if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
		*match = new;
}
#endif /* MAX_HWIFS > 1 */

/*
 * init request queue
 */
static int ide_init_queue(ide_drive_t *drive)
{
893
	struct request_queue *q;
Linus Torvalds's avatar
Linus Torvalds committed
894 895 896 897 898 899 900 901 902 903 904
	ide_hwif_t *hwif = HWIF(drive);
	int max_sectors = 256;
	int max_sg_entries = PRD_ENTRIES;

	/*
	 *	Our default set up assumes the normal IDE case,
	 *	that is 64K segmenting, standard PRD setup
	 *	and LBA28. Some drivers then impose their own
	 *	limits and LBA48 we could raise it but as yet
	 *	do not.
	 */
905

906
	q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
Linus Torvalds's avatar
Linus Torvalds committed
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
	if (!q)
		return 1;

	q->queuedata = drive;
	blk_queue_segment_boundary(q, 0xffff);

	if (hwif->rqsize < max_sectors)
		max_sectors = hwif->rqsize;
	blk_queue_max_sectors(q, max_sectors);

#ifdef CONFIG_PCI
	/* When we have an IOMMU, we may have a problem where pci_map_sg()
	 * creates segments that don't completely match our boundary
	 * requirements and thus need to be broken up again. Because it
	 * doesn't align properly either, we may actually have to break up
	 * to more segments than what was we got in the first place, a max
	 * worst case is twice as many.
	 * This will be fixed once we teach pci_map_sg() about our boundary
	 * requirements, hopefully soon. *FIXME*
	 */
	if (!PCI_DMA_BUS_IS_PHYS)
		max_sg_entries >>= 1;
#endif /* CONFIG_PCI */

	blk_queue_max_hw_segments(q, max_sg_entries);
	blk_queue_max_phys_segments(q, max_sg_entries);

	/* assign drive queue */
	drive->queue = q;

	/* needs drive->queue to be set */
	ide_toggle_bounce(drive, 1);

	return 0;
}

943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959
static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
{
	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;

	spin_lock_irq(&ide_lock);
	if (!hwgroup->drive) {
		/* first drive for hwgroup. */
		drive->next = drive;
		hwgroup->drive = drive;
		hwgroup->hwif = HWIF(hwgroup->drive);
	} else {
		drive->next = hwgroup->drive->next;
		hwgroup->drive->next = drive;
	}
	spin_unlock_irq(&ide_lock);
}

960 961 962 963 964 965 966 967 968
/*
 * For any present drive:
 * - allocate the block device queue
 * - link drive into the hwgroup
 */
static void ide_port_setup_devices(ide_hwif_t *hwif)
{
	int i;

969
	mutex_lock(&ide_cfg_mtx);
970 971 972 973 974 975 976 977 978 979 980 981 982 983
	for (i = 0; i < MAX_DRIVES; i++) {
		ide_drive_t *drive = &hwif->drives[i];

		if (!drive->present)
			continue;

		if (ide_init_queue(drive)) {
			printk(KERN_ERR "ide: failed to init %s\n",
					drive->name);
			continue;
		}

		ide_add_drive_to_hwgroup(drive);
	}
984
	mutex_unlock(&ide_cfg_mtx);
985 986
}

Linus Torvalds's avatar
Linus Torvalds committed
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
/*
 * This routine sets up the irq for an ide interface, and creates a new
 * hwgroup for the irq/hwif if none was previously assigned.
 *
 * Much of the code is for correctly detecting/handling irq sharing
 * and irq serialization situations.  This is somewhat complex because
 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 */
static int init_irq (ide_hwif_t *hwif)
{
	unsigned int index;
	ide_hwgroup_t *hwgroup;
	ide_hwif_t *match = NULL;


	BUG_ON(in_interrupt());
	BUG_ON(irqs_disabled());	
1004 1005
	BUG_ON(hwif == NULL);

1006
	mutex_lock(&ide_cfg_mtx);
Linus Torvalds's avatar
Linus Torvalds committed
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 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
	hwif->hwgroup = NULL;
#if MAX_HWIFS > 1
	/*
	 * Group up with any other hwifs that share our irq(s).
	 */
	for (index = 0; index < MAX_HWIFS; index++) {
		ide_hwif_t *h = &ide_hwifs[index];
		if (h->hwgroup) {  /* scan only initialized hwif's */
			if (hwif->irq == h->irq) {
				hwif->sharing_irq = h->sharing_irq = 1;
				if (hwif->chipset != ide_pci ||
				    h->chipset != ide_pci) {
					save_match(hwif, h, &match);
				}
			}
			if (hwif->serialized) {
				if (hwif->mate && hwif->mate->irq == h->irq)
					save_match(hwif, h, &match);
			}
			if (h->serialized) {
				if (h->mate && hwif->irq == h->mate->irq)
					save_match(hwif, h, &match);
			}
		}
	}
#endif /* MAX_HWIFS > 1 */
	/*
	 * If we are still without a hwgroup, then form a new one
	 */
	if (match) {
		hwgroup = match->hwgroup;
		hwif->hwgroup = hwgroup;
		/*
		 * Link us into the hwgroup.
		 * This must be done early, do ensure that unexpected_intr
		 * can find the hwif and prevent irq storms.
		 * No drives are attached to the new hwif, choose_drive
		 * can't do anything stupid (yet).
		 * Add ourself as the 2nd entry to the hwgroup->hwif
		 * linked list, the first entry is the hwif that owns
		 * hwgroup->handler - do not change that.
		 */
		spin_lock_irq(&ide_lock);
		hwif->next = hwgroup->hwif->next;
		hwgroup->hwif->next = hwif;
1052
		BUG_ON(hwif->next == hwif);
Linus Torvalds's avatar
Linus Torvalds committed
1053 1054
		spin_unlock_irq(&ide_lock);
	} else {
1055 1056 1057 1058
		hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
				       hwif_to_node(hwif));
		if (hwgroup == NULL)
			goto out_up;
Linus Torvalds's avatar
Linus Torvalds committed
1059 1060

		hwif->hwgroup = hwgroup;
1061
		hwgroup->hwif = hwif->next = hwif;
Linus Torvalds's avatar
Linus Torvalds committed
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071

		init_timer(&hwgroup->timer);
		hwgroup->timer.function = &ide_timer_expiry;
		hwgroup->timer.data = (unsigned long) hwgroup;
	}

	/*
	 * Allocate the irq, if not already obtained for another hwif
	 */
	if (!match || match->irq != hwif->irq) {
1072
		int sa = 0;
Adrian Bunk's avatar
Adrian Bunk committed
1073
#if defined(__mc68000__)
1074
		sa = IRQF_SHARED;
1075
#endif /* __mc68000__ */
Linus Torvalds's avatar
Linus Torvalds committed
1076

1077
		if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1078
			sa = IRQF_SHARED;
Linus Torvalds's avatar
Linus Torvalds committed
1079 1080 1081 1082 1083 1084 1085 1086 1087

		if (hwif->io_ports[IDE_CONTROL_OFFSET])
			/* clear nIEN */
			hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);

		if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
	       		goto out_unlink;
	}

1088 1089 1090 1091 1092 1093 1094 1095
	if (!hwif->rqsize) {
		if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
		    (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
			hwif->rqsize = 256;
		else
			hwif->rqsize = 65536;
	}

Adrian Bunk's avatar
Adrian Bunk committed
1096
#if !defined(__mc68000__)
Linus Torvalds's avatar
Linus Torvalds committed
1097 1098 1099 1100 1101 1102 1103
	printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
		hwif->io_ports[IDE_DATA_OFFSET],
		hwif->io_ports[IDE_DATA_OFFSET]+7,
		hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
#else
	printk("%s at 0x%08lx on irq %d", hwif->name,
		hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
Adrian Bunk's avatar
Adrian Bunk committed
1104
#endif /* __mc68000__ */
Linus Torvalds's avatar
Linus Torvalds committed
1105 1106 1107 1108
	if (match)
		printk(" (%sed with %s)",
			hwif->sharing_irq ? "shar" : "serializ", match->name);
	printk("\n");
1109

1110
	mutex_unlock(&ide_cfg_mtx);
Linus Torvalds's avatar
Linus Torvalds committed
1111 1112
	return 0;
out_unlink:
1113
	ide_remove_port_from_hwgroup(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
1114
out_up:
1115
	mutex_unlock(&ide_cfg_mtx);
Linus Torvalds's avatar
Linus Torvalds committed
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
	return 1;
}

static int ata_lock(dev_t dev, void *data)
{
	/* FIXME: we want to pin hwif down */
	return 0;
}

static struct kobject *ata_probe(dev_t dev, int *part, void *data)
{
	ide_hwif_t *hwif = data;
	int unit = *part >> PARTN_BITS;
	ide_drive_t *drive = &hwif->drives[unit];
	if (!drive->present)
		return NULL;

	if (drive->media == ide_disk)
		request_module("ide-disk");
	if (drive->scsi)
		request_module("ide-scsi");
	if (drive->media == ide_cdrom || drive->media == ide_optical)
		request_module("ide-cd");
	if (drive->media == ide_tape)
		request_module("ide-tape");
	if (drive->media == ide_floppy)
		request_module("ide-floppy");

	return NULL;
}

static struct kobject *exact_match(dev_t dev, int *part, void *data)
{
	struct gendisk *p = data;
	*part &= (1 << PARTN_BITS) - 1;
1151
	return &p->dev.kobj;
Linus Torvalds's avatar
Linus Torvalds committed
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
}

static int exact_lock(dev_t dev, void *data)
{
	struct gendisk *p = data;

	if (!get_disk(p))
		return -1;
	return 0;
}

void ide_register_region(struct gendisk *disk)
{
	blk_register_region(MKDEV(disk->major, disk->first_minor),
			    disk->minors, NULL, exact_match, exact_lock, disk);
}

EXPORT_SYMBOL_GPL(ide_register_region);

void ide_unregister_region(struct gendisk *disk)
{
	blk_unregister_region(MKDEV(disk->major, disk->first_minor),
			      disk->minors);
}

EXPORT_SYMBOL_GPL(ide_unregister_region);

void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned int unit = (drive->select.all >> 4) & 1;

	disk->major = hwif->major;
	disk->first_minor = unit << PARTN_BITS;
	sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
	disk->queue = drive->queue;
}

EXPORT_SYMBOL_GPL(ide_init_disk);

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
{
	ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;

	if (drive == drive->next) {
		/* special case: last drive from hwgroup. */
		BUG_ON(hwgroup->drive != drive);
		hwgroup->drive = NULL;
	} else {
		ide_drive_t *walk;

		walk = hwgroup->drive;
		while (walk->next != drive)
			walk = walk->next;
		walk->next = drive->next;
		if (hwgroup->drive == drive) {
			hwgroup->drive = drive->next;
			hwgroup->hwif = hwgroup->drive->hwif;
		}
	}
	BUG_ON(hwgroup->drive == drive);
}

Linus Torvalds's avatar
Linus Torvalds committed
1215 1216 1217 1218
static void drive_release_dev (struct device *dev)
{
	ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);

1219 1220
	ide_proc_unregister_device(drive);

1221 1222
	spin_lock_irq(&ide_lock);
	ide_remove_drive_from_hwgroup(drive);
1223 1224
	kfree(drive->id);
	drive->id = NULL;
1225 1226 1227 1228 1229 1230 1231 1232
	drive->present = 0;
	/* Messed up locking ... */
	spin_unlock_irq(&ide_lock);
	blk_cleanup_queue(drive->queue);
	spin_lock_irq(&ide_lock);
	drive->queue = NULL;
	spin_unlock_irq(&ide_lock);

1233
	complete(&drive->gendev_rel_comp);
Linus Torvalds's avatar
Linus Torvalds committed
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
}

static int hwif_init(ide_hwif_t *hwif)
{
	int old_irq;

	if (!hwif->irq) {
		if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
		{
			printk("%s: DISABLED, NO IRQ\n", hwif->name);
1244
			return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1245 1246 1247 1248 1249 1250 1251 1252 1253
		}
	}

	if (register_blkdev(hwif->major, hwif->name))
		return 0;

	if (!hwif->sg_max_nents)
		hwif->sg_max_nents = PRD_ENTRIES;

1254
	hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
Linus Torvalds's avatar
Linus Torvalds committed
1255 1256 1257 1258 1259
				 GFP_KERNEL);
	if (!hwif->sg_table) {
		printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
		goto out;
	}
1260 1261

	sg_init_table(hwif->sg_table, hwif->sg_max_nents);
Linus Torvalds's avatar
Linus Torvalds committed
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
	
	if (init_irq(hwif) == 0)
		goto done;

	old_irq = hwif->irq;
	/*
	 *	It failed to initialise. Find the default IRQ for 
	 *	this port and try that.
	 */
	if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
		printk("%s: Disabled unable to get IRQ %d.\n",
			hwif->name, old_irq);
		goto out;
	}
	if (init_irq(hwif)) {
		printk("%s: probed IRQ %d and default IRQ %d failed.\n",
			hwif->name, old_irq, hwif->irq);
		goto out;
	}
	printk("%s: probed IRQ %d failed, using default.\n",
		hwif->name, hwif->irq);

done:
1285 1286
	blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
			    THIS_MODULE, ata_probe, ata_lock, hwif);
Linus Torvalds's avatar
Linus Torvalds committed
1287 1288 1289 1290 1291 1292 1293
	return 1;

out:
	unregister_blkdev(hwif->major, hwif->name);
	return 0;
}

1294 1295 1296 1297 1298 1299
static void hwif_register_devices(ide_hwif_t *hwif)
{
	unsigned int i;

	for (i = 0; i < MAX_DRIVES; i++) {
		ide_drive_t *drive = &hwif->drives[i];
1300 1301
		struct device *dev = &drive->gendev;
		int ret;
1302

1303 1304
		if (!drive->present)
			continue;
1305

1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
		ide_add_generic_settings(drive);

		snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
		dev->parent = &hwif->gendev;
		dev->bus = &ide_bus_type;
		dev->driver_data = drive;
		dev->release = drive_release_dev;

		ret = device_register(dev);
		if (ret < 0)
			printk(KERN_WARNING "IDE: %s: device_register error: "
					    "%d\n", __func__, ret);
1318 1319 1320
	}
}

1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
static void ide_port_init_devices(ide_hwif_t *hwif)
{
	int i;

	for (i = 0; i < MAX_DRIVES; i++) {
		ide_drive_t *drive = &hwif->drives[i];

		if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
			drive->io_32bit = 1;
		if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
			drive->unmask = 1;
1332 1333
		if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
			drive->no_unmask = 1;
1334 1335 1336
		if ((hwif->host_flags & IDE_HFLAG_NO_AUTOTUNE) == 0)
			drive->autotune = 1;
	}
1337 1338 1339

	if (hwif->port_init_devs)
		hwif->port_init_devs(hwif);
1340 1341
}

1342 1343
static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
			  const struct ide_port_info *d)
1344
{
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
	if (d->chipset != ide_etrax100)
		hwif->channel = port;

	if (d->chipset)
		hwif->chipset = d->chipset;

	if (d->init_iops)
		d->init_iops(hwif);

	if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0)
		ide_hwif_setup_dma(hwif, d);

	if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
	    (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
		hwif->irq = port ? 15 : 14;

	hwif->host_flags = d->host_flags;
	hwif->pio_mask = d->pio_mask;

	if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
		hwif->mate->serialized = hwif->serialized = 1;

	hwif->swdma_mask = d->swdma_mask;
	hwif->mwdma_mask = d->mwdma_mask;
	hwif->ultra_mask = d->udma_mask;

	/* reset DMA masks only for SFF-style DMA controllers */
1372
	if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0 && hwif->dma_base == 0)
1373 1374 1375 1376 1377 1378 1379 1380
		hwif->swdma_mask = hwif->mwdma_mask = hwif->ultra_mask = 0;

	if (d->host_flags & IDE_HFLAG_RQSIZE_256)
		hwif->rqsize = 256;

	/* call chipset specific routine for each enabled port */
	if (d->init_hwif)
		d->init_hwif(hwif);
1381
}
1382

1383 1384
static void ide_port_cable_detect(ide_hwif_t *hwif)
{
1385 1386 1387 1388
	if (hwif->cable_detect && (hwif->ultra_mask & 0x78)) {
		if (hwif->cbl != ATA_CBL_PATA40_SHORT)
			hwif->cbl = hwif->cable_detect(hwif);
	}
1389 1390
}

1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
static ssize_t store_delete_devices(struct device *portdev,
				    struct device_attribute *attr,
				    const char *buf, size_t n)
{
	ide_hwif_t *hwif = dev_get_drvdata(portdev);

	if (strncmp(buf, "1", n))
		return -EINVAL;

	ide_port_unregister_devices(hwif);

	return n;
};

static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);

static ssize_t store_scan(struct device *portdev,
			  struct device_attribute *attr,
			  const char *buf, size_t n)
{
	ide_hwif_t *hwif = dev_get_drvdata(portdev);

	if (strncmp(buf, "1", n))
		return -EINVAL;

	ide_port_unregister_devices(hwif);
	ide_port_scan(hwif);

	return n;
};

static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);

static struct device_attribute *ide_port_attrs[] = {
	&dev_attr_delete_devices,
	&dev_attr_scan,
	NULL
};

static int ide_sysfs_register_port(ide_hwif_t *hwif)
{
	int i, rc;

	for (i = 0; ide_port_attrs[i]; i++) {
		rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
		if (rc)
			break;
	}

	return rc;
}

1443 1444 1445
int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
{
	ide_hwif_t *hwif, *mate = NULL;
1446 1447
	int i, rc = 0;

1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
	for (i = 0; i < MAX_HWIFS; i++) {
		if (d == NULL || idx[i] == 0xff) {
			mate = NULL;
			continue;
		}

		hwif = &ide_hwifs[idx[i]];

		if (d->chipset != ide_etrax100 && (i & 1) && mate) {
			hwif->mate = mate;
			mate->mate = hwif;
		}

		mate = (i & 1) ? NULL : hwif;

		ide_init_port(hwif, i & 1, d);
1464
		ide_port_cable_detect(hwif);
1465
		ide_port_init_devices(hwif);
1466 1467
	}

1468
	for (i = 0; i < MAX_HWIFS; i++) {
1469 1470 1471
		if (idx[i] == 0xff)
			continue;

1472 1473 1474 1475 1476 1477 1478 1479 1480
		hwif = &ide_hwifs[idx[i]];

		if ((hwif->chipset != ide_4drives || !hwif->mate ||
		     !hwif->mate->present) && ide_hwif_request_regions(hwif)) {
			printk(KERN_ERR "%s: ports already in use, "
					"skipping probe\n", hwif->name);
			continue;
		}

1481
		if (ide_probe_port(hwif) < 0) {
1482
			ide_hwif_release_regions(hwif);
1483 1484 1485
			continue;
		}

1486 1487 1488 1489 1490 1491
		hwif->present = 1;

		if (hwif->chipset != ide_4drives || !hwif->mate ||
		    !hwif->mate->present)
			ide_register_port(hwif);

1492
		ide_port_tune_devices(hwif);
1493
	}
1494

1495
	for (i = 0; i < MAX_HWIFS; i++) {
1496 1497 1498 1499
		if (idx[i] == 0xff)
			continue;

		hwif = &ide_hwifs[idx[i]];
1500

1501 1502 1503
		if (!hwif->present)
			continue;

1504 1505 1506
		if (hwif_init(hwif) == 0) {
			printk(KERN_INFO "%s: failed to initialize IDE "
					 "interface\n", hwif->name);
1507
			hwif->present = 0;
1508 1509 1510
			rc = -1;
			continue;
		}
1511

1512 1513
		ide_port_setup_devices(hwif);

1514
		ide_acpi_init(hwif);
1515
		ide_acpi_port_init_devices(hwif);
1516 1517
	}

1518
	for (i = 0; i < MAX_HWIFS; i++) {
1519 1520 1521 1522
		if (idx[i] == 0xff)
			continue;

		hwif = &ide_hwifs[idx[i]];
1523

1524
		if (hwif->present) {
1525
			if (hwif->chipset == ide_unknown)
1526
				hwif->chipset = ide_generic;
1527
			hwif_register_devices(hwif);
1528
		}
1529 1530
	}

1531
	for (i = 0; i < MAX_HWIFS; i++) {
1532 1533 1534 1535 1536
		if (idx[i] == 0xff)
			continue;

		hwif = &ide_hwifs[idx[i]];

1537
		if (hwif->present) {
1538
			ide_sysfs_register_port(hwif);
1539
			ide_proc_register_port(hwif);