ide-probe.c 42.7 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

#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)
{
53
54
55
56
57
	u16 *id = drive->id;

	id[ATA_ID_CUR_CYLS]	= id[ATA_ID_CYLS]	= drive->cyl;
	id[ATA_ID_CUR_HEADS]	= id[ATA_ID_HEADS]	= drive->head;
	id[ATA_ID_CUR_SECTORS]	= id[ATA_ID_SECTORS]	= drive->sect;
Linus Torvalds's avatar
Linus Torvalds committed
58
59
60
61
}

static void ide_disk_init_chs(ide_drive_t *drive)
{
62
	u16 *id = drive->id;
Linus Torvalds's avatar
Linus Torvalds committed
63
64
65

	/* Extract geometry if we did not already have one for the drive */
	if (!drive->cyl || !drive->head || !drive->sect) {
66
67
68
		drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
		drive->head = drive->bios_head = id[ATA_ID_HEADS];
		drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
Linus Torvalds's avatar
Linus Torvalds committed
69
70
71
	}

	/* Handle logical geometry translation by the drive */
72
	if (ata_id_current_chs_valid(id)) {
73
74
75
		drive->cyl  = id[ATA_ID_CUR_CYLS];
		drive->head = id[ATA_ID_CUR_HEADS];
		drive->sect = id[ATA_ID_CUR_SECTORS];
Linus Torvalds's avatar
Linus Torvalds committed
76
77
78
	}

	/* Use physical geometry if what we have still makes no sense */
79
80
81
82
	if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
		drive->cyl  = id[ATA_ID_CYLS];
		drive->head = id[ATA_ID_HEADS];
		drive->sect = id[ATA_ID_SECTORS];
Linus Torvalds's avatar
Linus Torvalds committed
83
84
85
86
87
	}
}

static void ide_disk_init_mult_count(ide_drive_t *drive)
{
88
89
	u16 *id = drive->id;
	u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
Linus Torvalds's avatar
Linus Torvalds committed
90

91
	if (max_multsect) {
Linus Torvalds's avatar
Linus Torvalds committed
92
#ifdef CONFIG_IDEDISK_MULTI_MODE
93
94
95
96
97
98
		if ((max_multsect / 2) > 1)
			id[ATA_ID_MULTSECT] = max_multsect | 0x100;
		else
			id[ATA_ID_MULTSECT] &= ~0x1ff;

		drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
Linus Torvalds's avatar
Linus Torvalds committed
99
#endif
100
101
		if ((id[ATA_ID_MULTSECT] & 0x100) &&
		    (id[ATA_ID_MULTSECT] & 0xff))
102
			drive->special.b.set_multmode = 1;
Linus Torvalds's avatar
Linus Torvalds committed
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
	}
}

/**
 *	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);
119
120
	u16 *id = drive->id;
	char *m = (char *)&id[ATA_ID_PROD];
Linus Torvalds's avatar
Linus Torvalds committed
121
122
123
	int bswap = 1;

	/* read 512 bytes of id info */
124
	hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
Linus Torvalds's avatar
Linus Torvalds committed
125
126
127

	drive->id_read = 1;
	local_irq_enable();
128
129
130
131
#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
132
133
134
135
136
137
138
	ide_fix_driveid(id);

	/*
	 *  WIN_IDENTIFY returns little-endian info,
	 *  WIN_PIDENTIFY *usually* returns little-endian info.
	 */
	if (cmd == WIN_PIDENTIFY) {
139
140
141
		if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
		    (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
		    (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
Linus Torvalds's avatar
Linus Torvalds committed
142
			/* Vertos drives may still be weird */
143
			bswap ^= 1;
Linus Torvalds's avatar
Linus Torvalds committed
144
	}
145
146
147
148

	ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
	ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
	ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
Linus Torvalds's avatar
Linus Torvalds committed
149

150
	/* we depend on this a lot! */
151
	m[ATA_ID_PROD_LEN - 1] = '\0';
152

153
	if (strstr(m, "E X A B Y T E N E S T"))
Linus Torvalds's avatar
Linus Torvalds committed
154
155
		goto err_misc;

156
	printk(KERN_INFO "%s: %s, ", drive->name, m);
157

Linus Torvalds's avatar
Linus Torvalds committed
158
159
160
161
162
163
164
	drive->present = 1;
	drive->dead = 0;

	/*
	 * Check for an ATAPI device
	 */
	if (cmd == WIN_PIDENTIFY) {
165
		u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
166
167

		printk(KERN_CONT "ATAPI ");
Linus Torvalds's avatar
Linus Torvalds committed
168
169
		switch (type) {
			case ide_floppy:
170
171
172
173
				if (!strstr(m, "CD-ROM")) {
					if (!strstr(m, "oppy") &&
					    !strstr(m, "poyp") &&
					    !strstr(m, "ZIP"))
174
						printk(KERN_CONT "cdrom or floppy?, assuming ");
Linus Torvalds's avatar
Linus Torvalds committed
175
					if (drive->media != ide_cdrom) {
176
						printk(KERN_CONT "FLOPPY");
Linus Torvalds's avatar
Linus Torvalds committed
177
178
179
180
181
182
183
184
185
186
						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 */
187
				if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
188
					printk(KERN_CONT "FLOPPY");
Linus Torvalds's avatar
Linus Torvalds committed
189
190
191
192
					type = ide_floppy;
					break;
				}
#endif
193
				printk(KERN_CONT "CD/DVD-ROM");
Linus Torvalds's avatar
Linus Torvalds committed
194
195
				break;
			case ide_tape:
196
				printk(KERN_CONT "TAPE");
Linus Torvalds's avatar
Linus Torvalds committed
197
198
				break;
			case ide_optical:
199
				printk(KERN_CONT "OPTICAL");
Linus Torvalds's avatar
Linus Torvalds committed
200
201
202
				drive->removable = 1;
				break;
			default:
203
				printk(KERN_CONT "UNKNOWN (type %d)", type);
Linus Torvalds's avatar
Linus Torvalds committed
204
205
				break;
		}
206
		printk(KERN_CONT " drive\n");
Linus Torvalds's avatar
Linus Torvalds committed
207
208
209
210
211
212
213
214
215
		drive->media = type;
		/* an ATAPI device ignores DRDY */
		drive->ready_stat = 0;
		return;
	}

	/*
	 * Not an ATAPI device: looks like a "regular" hard disk
	 */
216
217
218
219
220

	/*
	 * 0x848a = CompactFlash device
	 * These are *not* removable in Linux definition of the term
	 */
221
	if (id[ATA_ID_CONFIG] != 0x848a && (id[ATA_ID_CONFIG] & (1 << 7)))
Linus Torvalds's avatar
Linus Torvalds committed
222
223
224
		drive->removable = 1;

	drive->media = ide_disk;
225
226

	printk(KERN_CONT "%s DISK drive\n",
227
		(id[ATA_ID_CONFIG] == 0x848a) ? "CFA" : "ATA");
228

Linus Torvalds's avatar
Linus Torvalds committed
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
	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);
255
	struct ide_io_ports *io_ports = &hwif->io_ports;
256
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
257
	int use_altstatus = 0, rc;
Linus Torvalds's avatar
Linus Torvalds committed
258
259
260
261
262
263
	unsigned long timeout;
	u8 s = 0, a = 0;

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

264
	if (io_ports->ctl_addr) {
265
266
		a = tp_ops->read_altstatus(hwif);
		s = tp_ops->read_status(hwif);
267
		if ((a ^ s) & ~INDEX_STAT)
Linus Torvalds's avatar
Linus Torvalds committed
268
			/* ancient Seagate drives, broken interfaces */
269
270
271
272
			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
273
			/* use non-intrusive polling */
274
275
			use_altstatus = 1;
	}
Linus Torvalds's avatar
Linus Torvalds committed
276
277
278
279

	/* set features register for atapi
	 * identify command to be sure of reply
	 */
280
281
282
283
284
285
286
	if (cmd == WIN_PIDENTIFY) {
		ide_task_t task;

		memset(&task, 0, sizeof(task));
		/* disable DMA & overlap */
		task.tf_flags = IDE_TFLAG_OUT_FEATURE;

287
		tp_ops->tf_load(drive, &task);
288
	}
Linus Torvalds's avatar
Linus Torvalds committed
289
290

	/* ask drive for ID */
291
	tp_ops->exec_command(hwif, cmd);
Linus Torvalds's avatar
Linus Torvalds committed
292
293
294
295
296
297
298
299
300
301

	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);
302
303
		s = use_altstatus ? tp_ops->read_altstatus(hwif)
				  : tp_ops->read_status(hwif);
304
	} while (s & BUSY_STAT);
Linus Torvalds's avatar
Linus Torvalds committed
305
306
307

	/* wait for IRQ and DRQ_STAT */
	msleep(50);
308
	s = tp_ops->read_status(hwif);
309
310

	if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
Linus Torvalds's avatar
Linus Torvalds committed
311
312
313
314
315
316
317
318
319
		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 */
320
		(void)tp_ops->read_status(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
		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);
342
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
Linus Torvalds's avatar
Linus Torvalds committed
343
344
345
346
347
348
349
350
351
352
	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.
	 */
353
	if (hwif->io_ports.ctl_addr) {
Linus Torvalds's avatar
Linus Torvalds committed
354
355
356
357
		if (!hwif->irq) {
			autoprobe = 1;
			cookie = probe_irq_on();
		}
358
		tp_ops->set_irq(hwif, autoprobe);
Linus Torvalds's avatar
Linus Torvalds committed
359
360
361
362
363
364
	}

	retval = actual_try_to_identify(drive, cmd);

	if (autoprobe) {
		int irq;
365

366
		tp_ops->set_irq(hwif, 0);
Linus Torvalds's avatar
Linus Torvalds committed
367
		/* clear drive IRQ */
368
		(void)tp_ops->read_status(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
369
370
371
372
373
374
375
376
377
		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
				 */
378
				printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
Linus Torvalds's avatar
Linus Torvalds committed
379
380
381
382
383
384
385
					drive->name, cookie);
			}
		}
	}
	return retval;
}

386
387
388
389
390
391
392
static int ide_busy_sleep(ide_hwif_t *hwif)
{
	unsigned long timeout = jiffies + WAIT_WORSTCASE;
	u8 stat;

	do {
		msleep(50);
393
		stat = hwif->tp_ops->read_status(hwif);
394
395
396
397
398
399
		if ((stat & BUSY_STAT) == 0)
			return 0;
	} while (time_before(jiffies, timeout));

	return 1;
}
Linus Torvalds's avatar
Linus Torvalds committed
400

401
402
403
404
405
406
407
static u8 ide_read_device(ide_drive_t *drive)
{
	ide_task_t task;

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_IN_DEVICE;

408
	drive->hwif->tp_ops->tf_read(drive, &task);
409
410
411
412

	return task.tf.device;
}

Linus Torvalds's avatar
Linus Torvalds committed
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/**
 *	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);
437
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
438
439
	int rc;
	u8 stat;
Linus Torvalds's avatar
Linus Torvalds committed
440
441
442
443
444
445
446

	if (drive->present) {
		/* avoid waiting for inappropriate probes */
		if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
			return 4;
	}
#ifdef DEBUG
447
	printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
Linus Torvalds's avatar
Linus Torvalds committed
448
449
450
451
452
453
454
455
456
457
		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);
458
459

	if (ide_read_device(drive) != drive->select.all && !drive->present) {
Linus Torvalds's avatar
Linus Torvalds committed
460
461
462
463
464
465
466
467
468
469
		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;
	}

470
	stat = tp_ops->read_status(hwif);
471
472

	if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
Linus Torvalds's avatar
Linus Torvalds committed
473
474
475
476
477
478
	    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);
		}
479

480
		stat = tp_ops->read_status(hwif);
481
482

		if (stat == (BUSY_STAT | READY_STAT))
Linus Torvalds's avatar
Linus Torvalds committed
483
484
			return 4;

485
		if (rc == 1 && cmd == WIN_PIDENTIFY) {
486
487
			printk(KERN_ERR "%s: no response (status = 0x%02x), "
					"resetting drive\n", drive->name, stat);
Linus Torvalds's avatar
Linus Torvalds committed
488
			msleep(50);
489
			SELECT_DRIVE(drive);
Linus Torvalds's avatar
Linus Torvalds committed
490
			msleep(50);
491
			tp_ops->exec_command(hwif, WIN_SRST);
492
			(void)ide_busy_sleep(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
493
494
			rc = try_to_identify(drive, cmd);
		}
495
496

		/* ensure drive IRQ is clear */
497
		stat = tp_ops->read_status(hwif);
498

Linus Torvalds's avatar
Linus Torvalds committed
499
		if (rc == 1)
500
501
			printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
					drive->name, stat);
Linus Torvalds's avatar
Linus Torvalds committed
502
503
504
505
506
507
508
509
510
	} 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 */
511
		(void)tp_ops->read_status(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
512
513
514
515
516
517
518
519
520
521
	}
	return rc;
}

/*
 *
 */
static void enable_nest (ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
522
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
523
	u8 stat;
Linus Torvalds's avatar
Linus Torvalds committed
524

525
526
	printk(KERN_INFO "%s: enabling %s -- ",
		hwif->name, (char *)&drive->id[ATA_ID_PROD]);
527

Linus Torvalds's avatar
Linus Torvalds committed
528
529
	SELECT_DRIVE(drive);
	msleep(50);
530
	tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
531
532
533
534
535

	if (ide_busy_sleep(hwif)) {
		printk(KERN_CONT "failed (timeout)\n");
		return;
	}
Linus Torvalds's avatar
Linus Torvalds committed
536
537
538

	msleep(50);

539
	stat = tp_ops->read_status(hwif);
540
541
542
543
544

	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
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)
{
567
568
	char *m;

Linus Torvalds's avatar
Linus Torvalds committed
569
570
571
572
573
574
575
576
577
	/*
	 *	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"
	 */
 
578
	drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
579
580
581
582
583
584
	drive->id_read = 0;
	if(drive->id == NULL)
	{
		printk(KERN_ERR "ide: out of memory for id data.\n");
		return 0;
	}
585
586
587
588

	m = (char *)&drive->id[ATA_ID_PROD];
	strcpy(m, "UNKNOWN");

Linus Torvalds's avatar
Linus Torvalds committed
589
590
591
592
593
594
595
596
597
598
599
	/* 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;
600
601

		if (strstr(m, "E X A B Y T E N E S T"))
Alan Cox's avatar
Alan Cox committed
602
			enable_nest(drive);
Linus Torvalds's avatar
Linus Torvalds committed
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
	
		/* 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;
}

Pavel Machek's avatar
Pavel Machek committed
636
static void hwif_release_dev(struct device *dev)
Linus Torvalds's avatar
Linus Torvalds committed
637
638
639
{
	ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);

640
	complete(&hwif->gendev_rel_comp);
Linus Torvalds's avatar
Linus Torvalds committed
641
642
}

643
static int ide_register_port(ide_hwif_t *hwif)
Linus Torvalds's avatar
Linus Torvalds committed
644
{
645
646
	int ret;

Linus Torvalds's avatar
Linus Torvalds committed
647
648
649
650
	/* 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) {
651
652
		if (hwif->dev)
			hwif->gendev.parent = hwif->dev;
Linus Torvalds's avatar
Linus Torvalds committed
653
654
655
656
657
		else
			/* Would like to do = &device_legacy */
			hwif->gendev.parent = NULL;
	}
	hwif->gendev.release = hwif_release_dev;
658
	ret = device_register(&hwif->gendev);
659
	if (ret < 0) {
660
		printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
661
			__func__, ret);
662
663
664
		goto out;
	}

665
666
	hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
					      MKDEV(0, 0), hwif, hwif->name);
667
668
669
670
671
672
	if (IS_ERR(hwif->portdev)) {
		ret = PTR_ERR(hwif->portdev);
		device_unregister(&hwif->gendev);
	}
out:
	return ret;
Linus Torvalds's avatar
Linus Torvalds committed
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
/**
 *	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
702
{
703
	int unit, rc;
Linus Torvalds's avatar
Linus Torvalds committed
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719

	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 */
720
721
722
723
724
725
	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);
726
			hwif->tp_ops->set_irq(hwif, 1);
727
728
729
730
731
732
733
734
735
			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
736
	/* Exit function with master reselected (let's be sane) */
737
738
739
	if (unit)
		SELECT_DRIVE(&hwif->drives[0]);

Linus Torvalds's avatar
Linus Torvalds committed
740
741
742
743
744
	return rc;
}

/**
 *	ide_undecoded_slave	-	look for bad CF adapters
745
 *	@dev1: slave device
Linus Torvalds's avatar
Linus Torvalds committed
746
747
748
749
750
751
 *
 *	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.
 */

752
void ide_undecoded_slave(ide_drive_t *dev1)
Linus Torvalds's avatar
Linus Torvalds committed
753
{
754
	ide_drive_t *dev0 = &dev1->hwif->drives[0];
Linus Torvalds's avatar
Linus Torvalds committed
755

756
	if ((dev1->dn & 1) == 0 || dev0->present == 0)
Linus Torvalds's avatar
Linus Torvalds committed
757
758
759
		return;

	/* If the models don't match they are not the same product */
760
761
	if (strcmp((char *)&dev0->id[ATA_ID_PROD],
		   (char *)&dev1->id[ATA_ID_PROD]))
Linus Torvalds's avatar
Linus Torvalds committed
762
763
764
		return;

	/* Serial numbers do not match */
765
766
	if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
		    (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
Linus Torvalds's avatar
Linus Torvalds committed
767
768
769
		return;

	/* No serial number, thankfully very rare for CF */
770
	if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
Linus Torvalds's avatar
Linus Torvalds committed
771
772
773
774
775
		return;

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

776
	dev1->present = 0;
Linus Torvalds's avatar
Linus Torvalds committed
777
778
779
780
}

EXPORT_SYMBOL_GPL(ide_undecoded_slave);

781
static int ide_probe_port(ide_hwif_t *hwif)
Linus Torvalds's avatar
Linus Torvalds committed
782
783
784
{
	unsigned long flags;
	unsigned int irqd;
785
786
787
	int unit, rc = -ENODEV;

	BUG_ON(hwif->present);
Linus Torvalds's avatar
Linus Torvalds committed
788

789
	if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
790
		return -EACCES;
Linus Torvalds's avatar
Linus Torvalds committed
791
792
793
794
795
796
797
798
799
800
801

	/*
	 * 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);

802
	if (ide_port_wait_ready(hwif) == -EBUSY)
Linus Torvalds's avatar
Linus Torvalds committed
803
804
805
		printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);

	/*
806
807
	 * 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
808
	 */
809
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
Linus Torvalds's avatar
Linus Torvalds committed
810
811
812
		ide_drive_t *drive = &hwif->drives[unit];
		drive->dn = (hwif->channel ? 2 : 0) + unit;
		(void) probe_for_drive(drive);
813
814
		if (drive->present)
			rc = 0;
Linus Torvalds's avatar
Linus Torvalds committed
815
	}
816

Linus Torvalds's avatar
Linus Torvalds committed
817
	local_irq_restore(flags);
818

Linus Torvalds's avatar
Linus Torvalds committed
819
820
821
822
823
824
825
	/*
	 * Use cached IRQ number. It might be (and is...) changed by probe
	 * code above
	 */
	if (irqd)
		enable_irq(irqd);

826
	return rc;
827
828
829
830
}

static void ide_port_tune_devices(ide_hwif_t *hwif)
{
831
	const struct ide_port_ops *port_ops = hwif->port_ops;
832
833
	int unit;

834
835
836
	for (unit = 0; unit < MAX_DRIVES; unit++) {
		ide_drive_t *drive = &hwif->drives[unit];

837
838
		if (drive->present && port_ops && port_ops->quirkproc)
			port_ops->quirkproc(drive);
839
	}
840

Linus Torvalds's avatar
Linus Torvalds committed
841
842
843
844
	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		ide_drive_t *drive = &hwif->drives[unit];

		if (drive->present) {
845
			ide_set_max_pio(drive);
Linus Torvalds's avatar
Linus Torvalds committed
846
847
848

			drive->nice1 = 1;

849
			if (hwif->dma_ops)
850
				ide_set_dma(drive);
Linus Torvalds's avatar
Linus Torvalds committed
851
852
		}
	}
853
854
855
856

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

857
		if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
858
859
			drive->no_io_32bit = 1;
		else
860
			drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
861
	}
Linus Torvalds's avatar
Linus Torvalds committed
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
}

#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;
883
		printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
Linus Torvalds's avatar
Linus Torvalds committed
884
885
886
887
888
889
890
891
892
893
894
895
			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)
{
896
	struct request_queue *q;
Linus Torvalds's avatar
Linus Torvalds committed
897
898
899
900
901
902
903
904
905
906
907
	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.
	 */
908

909
	q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
Linus Torvalds's avatar
Linus Torvalds committed
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
943
944
945
	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;
}

946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
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);
}

963
964
965
966
967
968
969
970
971
/*
 * 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;

972
	mutex_lock(&ide_cfg_mtx);
973
974
975
976
977
978
979
980
981
982
983
984
985
986
	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);
	}
987
	mutex_unlock(&ide_cfg_mtx);
988
989
}

990
991
static ide_hwif_t *ide_ports[MAX_HWIFS];

992
993
994
995
void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
{
	ide_hwgroup_t *hwgroup = hwif->hwgroup;

996
997
	ide_ports[hwif->index] = NULL;

998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
	spin_lock_irq(&ide_lock);
	/*
	 * Remove us from the hwgroup, and free
	 * the hwgroup if we were the only member
	 */
	if (hwif->next == hwif) {
		BUG_ON(hwgroup->hwif != hwif);
		kfree(hwgroup);
	} else {
		/* There is another interface in hwgroup.
		 * Unlink us, and set hwgroup->drive and ->hwif to
		 * something sane.
		 */
		ide_hwif_t *g = hwgroup->hwif;

		while (g->next != hwif)
			g = g->next;
		g->next = hwif->next;
		if (hwgroup->hwif == hwif) {
			/* Chose a random hwif for hwgroup->hwif.
			 * It's guaranteed that there are no drives
			 * left in the hwgroup.
			 */
			BUG_ON(hwgroup->drive != NULL);
			hwgroup->hwif = g;
		}
		BUG_ON(hwgroup->hwif == hwif);
	}
	spin_unlock_irq(&ide_lock);
}

Linus Torvalds's avatar
Linus Torvalds committed
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
/*
 * 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)
{
1039
	struct ide_io_ports *io_ports = &hwif->io_ports;
Linus Torvalds's avatar
Linus Torvalds committed
1040
1041
1042
1043
1044
1045
1046
	unsigned int index;
	ide_hwgroup_t *hwgroup;
	ide_hwif_t *match = NULL;


	BUG_ON(in_interrupt());
	BUG_ON(irqs_disabled());	
1047
1048
	BUG_ON(hwif == NULL);

1049
	mutex_lock(&ide_cfg_mtx);
Linus Torvalds's avatar
Linus Torvalds committed
1050
1051
1052
1053
1054
1055
	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++) {
1056
1057
1058
		ide_hwif_t *h = ide_ports[index];

		if (h && h->hwgroup) {  /* scan only initialized ports */
Linus Torvalds's avatar
Linus Torvalds committed
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
			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;
1096
		BUG_ON(hwif->next == hwif);
Linus Torvalds's avatar
Linus Torvalds committed
1097
1098
		spin_unlock_irq(&ide_lock);
	} else {
1099
1100
1101
1102
		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
1103
1104

		hwif->hwgroup = hwgroup;
1105
		hwgroup->hwif = hwif->next = hwif;
Linus Torvalds's avatar
Linus Torvalds committed
1106
1107
1108
1109
1110
1111

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

1112
1113
	ide_ports[hwif->index] = hwif;

Linus Torvalds's avatar
Linus Torvalds committed
1114
1115
1116
1117
	/*
	 * Allocate the irq, if not already obtained for another hwif
	 */
	if (!match || match->irq != hwif->irq) {
1118
		int sa = 0;
Adrian Bunk's avatar
Adrian Bunk committed
1119
#if defined(__mc68000__)
1120
		sa = IRQF_SHARED;
1121
#endif /* __mc68000__ */
Linus Torvalds's avatar
Linus Torvalds committed
1122

1123
		if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1124
			sa = IRQF_SHARED;
Linus Torvalds's avatar
Linus Torvalds committed
1125

1126
		if (io_ports->ctl_addr)
1127
			hwif->tp_ops->set_irq(hwif, 1);
Linus Torvalds's avatar
Linus Torvalds committed
1128
1129
1130
1131
1132

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

1133
1134
1135
1136
1137
1138
1139
1140
	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
1141
#if !defined(__mc68000__)
1142
	printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1143
1144
		io_ports->data_addr, io_ports->status_addr,
		io_ports->ctl_addr, hwif->irq);
Linus Torvalds's avatar
Linus Torvalds committed
1145
#else
1146
	printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1147
		io_ports->data_addr, hwif->irq);
Adrian Bunk's avatar
Adrian Bunk committed
1148
#endif /* __mc68000__ */
Linus Torvalds's avatar
Linus Torvalds committed
1149
	if (match)
1150
		printk(KERN_CONT " (%sed with %s)",
Linus Torvalds's avatar
Linus Torvalds committed
1151
			hwif->sharing_irq ? "shar" : "serializ", match->name);
1152
	printk(KERN_CONT "\n");
1153

1154
	mutex_unlock(&ide_cfg_mtx);
Linus Torvalds's avatar
Linus Torvalds committed
1155
1156
	return 0;
out_unlink:
1157
	ide_remove_port_from_hwgroup(hwif);
Linus Torvalds's avatar
Linus Torvalds committed
1158
out_up:
1159
	mutex_unlock(&ide_cfg_mtx);
Linus Torvalds's avatar
Linus Torvalds committed
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
1192
1193
1194
	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;
1195
	return &disk_to_dev(p)->kobj;
Linus Torvalds's avatar
Linus Torvalds committed
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
}

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);

1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
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
1259
1260
1261
1262
static void drive_release_dev (struct device *dev)
{
	ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);

1263
1264
	ide_proc_unregister_device(drive);

1265
1266
	spin_lock_irq(&ide_lock);
	ide_remove_drive_from_hwgroup(drive);
1267
1268
	kfree(drive->id);
	drive->id = NULL;
1269
1270
1271
1272
1273
1274
1275
1276
	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);

1277
	complete(&drive->gendev_rel_comp);
Linus Torvalds's avatar
Linus Torvalds committed
1278
1279
1280
1281
1282
1283
1284
}

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

	if (!hwif->irq) {
1285
		hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1286
		if (!hwif->irq) {
1287
			printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1288
			return 0;
Linus Torvalds's avatar
Linus Torvalds committed
1289
1290
1291
1292
1293
1294
1295
1296
1297
		}
	}

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

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

1298
	hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
Linus Torvalds's avatar
Linus Torvalds committed
1299
1300
1301
1302
1303
				 GFP_KERNEL);
	if (!hwif->sg_table) {
		printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
		goto out;
	}
1304
1305

	sg_init_table(hwif->sg_table, hwif->sg_max_nents);
Linus Torvalds's avatar
Linus Torvalds committed
1306
1307
1308
1309
1310
1311
1312
1313
1314
	
	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.
	 */
1315
	hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1316
	if (!hwif->irq) {
1317
		printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
1318
1319
1320
1321
			hwif->name, old_irq);
		goto out;
	}
	if (init_irq(hwif)) {
1322
		printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
Linus Torvalds's avatar
Linus Torvalds committed
1323
1324
1325
			hwif->name, old_irq, hwif->irq);
		goto out;
	}
1326
	printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
Linus Torvalds's avatar
Linus Torvalds committed
1327
1328
1329
		hwif->name, hwif->irq);

done:
1330
1331
	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
1332
1333
1334
1335
1336
1337
1338
	return 1;

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

1339
1340
1341
1342
1343
1344
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];
1345
1346
		struct device *dev = &drive->gendev;
		int ret;
1347

1348
1349
		if (!drive->present)
			continue;
1350

1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
		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);
1363
1364
1365
	}
}

1366
1367
static void ide_port_init_devices(ide_hwif_t *hwif)
{
1368
	const struct ide_port_ops *port_ops = hwif->port_ops;
1369
1370
1371
1372
1373
1374
1375
1376
1377
	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;
1378
1379
		if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
			drive->no_unmask = 1;
1380

1381
1382
1383
		if (port_ops && port_ops->init_dev)
			port_ops->init_dev(drive);
	}
1384
1385
}

1386
1387
static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
			  const struct ide_port_info *d)
1388
{
1389
	hwif->channel = port;
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400

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

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

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

1401
1402
	/* ->host_flags may be set by ->init_iops (or even earlier...) */
	hwif->host_flags |= d->host_flags;
1403
1404
	hwif->pio_mask = d->pio_mask;

1405
1406
1407
	if (d->tp_ops)
		hwif->tp_ops = d->tp_ops;

1408
1409
1410
1411
	/* ->set_pio_mode for DTC2278 is currently limited to port 0 */
	if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
		hwif->port_ops = d->port_ops;

1412
1413
1414
1415
	hwif->swdma_mask = d->swdma_mask;
	hwif->mwdma_mask = d->mwdma_mask;
	hwif->ultra_mask = d->udma_mask;

1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
	if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
		int rc;

		if (d->init_dma)
			rc = d->init_dma(hwif, d);
		else
			rc = ide_hwif_setup_dma(hwif, d);

		if (rc < 0) {
			printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1426
			hwif->dma_base = 0;
1427
1428
1429
			hwif->swdma_mask = 0;
			hwif->mwdma_mask = 0;
			hwif->ultra_mask = 0;
1430
1431
		} else if (d->dma_ops)
			hwif->dma_ops = d->dma_ops;
1432
	}
1433

1434
1435
1436
1437
1438
1439
	if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
	    ((d->ho