summaryrefslogtreecommitdiff
path: root/drivers/scsi/scsi.c
blob: 9232f3a82432d40761d1207815978d21d65fbbda (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
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
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <inttypes.h>
#include <pci.h>
#include <scsi.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>

#if !defined(CONFIG_DM_SCSI)
# ifdef CONFIG_SCSI_DEV_LIST
#  define SCSI_DEV_LIST CONFIG_SCSI_DEV_LIST
# else
#  ifdef CONFIG_SATA_ULI5288

#   define SCSI_VEND_ID 0x10b9
#   define SCSI_DEV_ID  0x5288

#  elif !defined(CONFIG_SCSI_AHCI_PLAT)
#   error no scsi device defined
#  endif
# define SCSI_DEV_LIST {SCSI_VEND_ID, SCSI_DEV_ID}
# endif
#endif

#if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
const struct pci_device_id scsi_device_list[] = { SCSI_DEV_LIST };
#endif
static struct scsi_cmd tempccb;	/* temporary scsi command buffer */

static unsigned char tempbuff[512]; /* temporary data buffer */

#if !defined(CONFIG_DM_SCSI)
static int scsi_max_devs; /* number of highest available scsi device */

static int scsi_curr_dev; /* current device */

static struct blk_desc scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE];
#endif

/* almost the maximum amount of the scsi_ext command.. */
#define SCSI_MAX_READ_BLK 0xFFFF
#define SCSI_LBA48_READ	0xFFFFFFF

static void scsi_print_error(struct scsi_cmd *pccb)
{
	/* Dummy function that could print an error for debugging */
}

#ifdef CONFIG_SYS_64BIT_LBA
void scsi_setup_read16(struct scsi_cmd *pccb, lbaint_t start,
		       unsigned long blocks)
{
	pccb->cmd[0] = SCSI_READ16;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = (unsigned char)(start >> 56) & 0xff;
	pccb->cmd[3] = (unsigned char)(start >> 48) & 0xff;
	pccb->cmd[4] = (unsigned char)(start >> 40) & 0xff;
	pccb->cmd[5] = (unsigned char)(start >> 32) & 0xff;
	pccb->cmd[6] = (unsigned char)(start >> 24) & 0xff;
	pccb->cmd[7] = (unsigned char)(start >> 16) & 0xff;
	pccb->cmd[8] = (unsigned char)(start >> 8) & 0xff;
	pccb->cmd[9] = (unsigned char)start & 0xff;
	pccb->cmd[10] = 0;
	pccb->cmd[11] = (unsigned char)(blocks >> 24) & 0xff;
	pccb->cmd[12] = (unsigned char)(blocks >> 16) & 0xff;
	pccb->cmd[13] = (unsigned char)(blocks >> 8) & 0xff;
	pccb->cmd[14] = (unsigned char)blocks & 0xff;
	pccb->cmd[15] = 0;
	pccb->cmdlen = 16;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	debug("scsi_setup_read16: cmd: %02X %02X startblk %02X%02X%02X%02X%02X%02X%02X%02X blccnt %02X%02X%02X%02X\n",
	      pccb->cmd[0], pccb->cmd[1],
	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
	      pccb->cmd[6], pccb->cmd[7], pccb->cmd[8], pccb->cmd[9],
	      pccb->cmd[11], pccb->cmd[12], pccb->cmd[13], pccb->cmd[14]);
}
#endif

static void scsi_setup_read_ext(struct scsi_cmd *pccb, lbaint_t start,
				unsigned short blocks)
{
	pccb->cmd[0] = SCSI_READ10;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
	pccb->cmd[5] = (unsigned char)start & 0xff;
	pccb->cmd[6] = 0;
	pccb->cmd[7] = (unsigned char)(blocks >> 8) & 0xff;
	pccb->cmd[8] = (unsigned char)blocks & 0xff;
	pccb->cmd[6] = 0;
	pccb->cmdlen = 10;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	debug("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
	      pccb->cmd[0], pccb->cmd[1],
	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
	      pccb->cmd[7], pccb->cmd[8]);
}

static void scsi_setup_write_ext(struct scsi_cmd *pccb, lbaint_t start,
				 unsigned short blocks)
{
	pccb->cmd[0] = SCSI_WRITE10;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
	pccb->cmd[5] = (unsigned char)start & 0xff;
	pccb->cmd[6] = 0;
	pccb->cmd[7] = ((unsigned char)(blocks >> 8)) & 0xff;
	pccb->cmd[8] = (unsigned char)blocks & 0xff;
	pccb->cmd[9] = 0;
	pccb->cmdlen = 10;
	pccb->msgout[0] = SCSI_IDENTIFY;  /* NOT USED */
	debug("%s: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
	      __func__,
	      pccb->cmd[0], pccb->cmd[1],
	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
	      pccb->cmd[7], pccb->cmd[8]);
}

static void scsi_setup_inquiry(struct scsi_cmd *pccb)
{
	pccb->cmd[0] = SCSI_INQUIRY;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = 0;
	pccb->cmd[3] = 0;
	if (pccb->datalen > 255)
		pccb->cmd[4] = 255;
	else
		pccb->cmd[4] = (unsigned char)pccb->datalen;
	pccb->cmd[5] = 0;
	pccb->cmdlen = 6;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
}

#ifdef CONFIG_BLK
static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
		       void *buffer)
#else
static ulong scsi_read(struct blk_desc *block_dev, lbaint_t blknr,
		       lbaint_t blkcnt, void *buffer)
#endif
{
#ifdef CONFIG_BLK
	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
	struct udevice *bdev = dev->parent;
#else
	struct udevice *bdev = NULL;
#endif
	lbaint_t start, blks;
	uintptr_t buf_addr;
	unsigned short smallblks = 0;
	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;

	/* Setup device */
	pccb->target = block_dev->target;
	pccb->lun = block_dev->lun;
	buf_addr = (unsigned long)buffer;
	start = blknr;
	blks = blkcnt;
	debug("\nscsi_read: dev %d startblk " LBAF
	      ", blccnt " LBAF " buffer %lx\n",
	      block_dev->devnum, start, blks, (unsigned long)buffer);
	do {
		pccb->pdata = (unsigned char *)buf_addr;
#ifdef CONFIG_SYS_64BIT_LBA
		if (start > SCSI_LBA48_READ) {
			unsigned long blocks;
			blocks = min_t(lbaint_t, blks, SCSI_MAX_READ_BLK);
			pccb->datalen = block_dev->blksz * blocks;
			scsi_setup_read16(pccb, start, blocks);
			start += blocks;
			blks -= blocks;
		} else
#endif
		if (blks > SCSI_MAX_READ_BLK) {
			pccb->datalen = block_dev->blksz *
				SCSI_MAX_READ_BLK;
			smallblks = SCSI_MAX_READ_BLK;
			scsi_setup_read_ext(pccb, start, smallblks);
			start += SCSI_MAX_READ_BLK;
			blks -= SCSI_MAX_READ_BLK;
		} else {
			pccb->datalen = block_dev->blksz * blks;
			smallblks = (unsigned short)blks;
			scsi_setup_read_ext(pccb, start, smallblks);
			start += blks;
			blks = 0;
		}
		debug("scsi_read_ext: startblk " LBAF
		      ", blccnt %x buffer %" PRIXPTR "\n",
		      start, smallblks, buf_addr);
		if (scsi_exec(bdev, pccb)) {
			scsi_print_error(pccb);
			blkcnt -= blks;
			break;
		}
		buf_addr += pccb->datalen;
	} while (blks != 0);
	debug("scsi_read_ext: end startblk " LBAF
	      ", blccnt %x buffer %" PRIXPTR "\n", start, smallblks, buf_addr);
	return blkcnt;
}

/*******************************************************************************
 * scsi_write
 */

/* Almost the maximum amount of the scsi_ext command.. */
#define SCSI_MAX_WRITE_BLK 0xFFFF

#ifdef CONFIG_BLK
static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
			const void *buffer)
#else
static ulong scsi_write(struct blk_desc *block_dev, lbaint_t blknr,
			lbaint_t blkcnt, const void *buffer)
#endif
{
#ifdef CONFIG_BLK
	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
	struct udevice *bdev = dev->parent;
#else
	struct udevice *bdev = NULL;
#endif
	lbaint_t start, blks;
	uintptr_t buf_addr;
	unsigned short smallblks;
	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;

	/* Setup device */
	pccb->target = block_dev->target;
	pccb->lun = block_dev->lun;
	buf_addr = (unsigned long)buffer;
	start = blknr;
	blks = blkcnt;
	debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
	      __func__, block_dev->devnum, start, blks, (unsigned long)buffer);
	do {
		pccb->pdata = (unsigned char *)buf_addr;
		if (blks > SCSI_MAX_WRITE_BLK) {
			pccb->datalen = (block_dev->blksz *
					 SCSI_MAX_WRITE_BLK);
			smallblks = SCSI_MAX_WRITE_BLK;
			scsi_setup_write_ext(pccb, start, smallblks);
			start += SCSI_MAX_WRITE_BLK;
			blks -= SCSI_MAX_WRITE_BLK;
		} else {
			pccb->datalen = block_dev->blksz * blks;
			smallblks = (unsigned short)blks;
			scsi_setup_write_ext(pccb, start, smallblks);
			start += blks;
			blks = 0;
		}
		debug("%s: startblk " LBAF ", blccnt %x buffer %" PRIXPTR "\n",
		      __func__, start, smallblks, buf_addr);
		if (scsi_exec(bdev, pccb)) {
			scsi_print_error(pccb);
			blkcnt -= blks;
			break;
		}
		buf_addr += pccb->datalen;
	} while (blks != 0);
	debug("%s: end startblk " LBAF ", blccnt %x buffer %" PRIXPTR "\n",
	      __func__, start, smallblks, buf_addr);
	return blkcnt;
}

#if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
void scsi_init(void)
{
	int busdevfunc = -1;
	int i;
	/*
	 * Find a device from the list, this driver will support a single
	 * controller.
	 */
	for (i = 0; i < ARRAY_SIZE(scsi_device_list); i++) {
		/* get PCI Device ID */
#ifdef CONFIG_DM_PCI
		struct udevice *dev;
		int ret;

		ret = dm_pci_find_device(scsi_device_list[i].vendor,
					 scsi_device_list[i].device, 0, &dev);
		if (!ret) {
			busdevfunc = dm_pci_get_bdf(dev);
			break;
		}
#else
		busdevfunc = pci_find_device(scsi_device_list[i].vendor,
					     scsi_device_list[i].device,
					     0);
#endif
		if (busdevfunc != -1)
			break;
	}

	if (busdevfunc == -1) {
		printf("Error: SCSI Controller(s) ");
		for (i = 0; i < ARRAY_SIZE(scsi_device_list); i++) {
			printf("%04X:%04X ",
			       scsi_device_list[i].vendor,
			       scsi_device_list[i].device);
		}
		printf("not found\n");
		return;
	}
#ifdef DEBUG
	else {
		printf("SCSI Controller (%04X,%04X) found (%d:%d:%d)\n",
		       scsi_device_list[i].vendor,
		       scsi_device_list[i].device,
		       (busdevfunc >> 16) & 0xFF,
		       (busdevfunc >> 11) & 0x1F,
		       (busdevfunc >> 8) & 0x7);
	}
#endif
	bootstage_start(BOOTSTAGE_ID_ACCUM_SCSI, "ahci");
	scsi_low_level_init(busdevfunc);
	scsi_scan(1);
	bootstage_accum(BOOTSTAGE_ID_ACCUM_SCSI);
}
#endif

/* copy src to dest, skipping leading and trailing blanks
 * and null terminate the string
 */
static void scsi_ident_cpy(unsigned char *dest, unsigned char *src,
			   unsigned int len)
{
	int start, end;

	start = 0;
	while (start < len) {
		if (src[start] != ' ')
			break;
		start++;
	}
	end = len-1;
	while (end > start) {
		if (src[end] != ' ')
			break;
		end--;
	}
	for (; start <= end; start++)
		*dest ++= src[start];
	*dest = '\0';
}

static int scsi_read_capacity(struct udevice *dev, struct scsi_cmd *pccb,
			      lbaint_t *capacity, unsigned long *blksz)
{
	*capacity = 0;

	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
	pccb->cmd[0] = SCSI_RD_CAPAC10;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmdlen = 10;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */

	pccb->datalen = 8;
	if (scsi_exec(dev, pccb) != true)
		return 1;

	*capacity = ((lbaint_t)pccb->pdata[0] << 24) |
		    ((lbaint_t)pccb->pdata[1] << 16) |
		    ((lbaint_t)pccb->pdata[2] << 8)  |
		    ((lbaint_t)pccb->pdata[3]);

	if (*capacity != 0xffffffff) {
		/* Read capacity (10) was sufficient for this drive. */
		*blksz = ((unsigned long)pccb->pdata[4] << 24) |
			 ((unsigned long)pccb->pdata[5] << 16) |
			 ((unsigned long)pccb->pdata[6] << 8)  |
			 ((unsigned long)pccb->pdata[7]);
		return 0;
	}

	/* Read capacity (10) was insufficient. Use read capacity (16). */
	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
	pccb->cmd[0] = SCSI_RD_CAPAC16;
	pccb->cmd[1] = 0x10;
	pccb->cmdlen = 16;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */

	pccb->datalen = 16;
	if (scsi_exec(dev, pccb) != true)
		return 1;

	*capacity = ((uint64_t)pccb->pdata[0] << 56) |
		    ((uint64_t)pccb->pdata[1] << 48) |
		    ((uint64_t)pccb->pdata[2] << 40) |
		    ((uint64_t)pccb->pdata[3] << 32) |
		    ((uint64_t)pccb->pdata[4] << 24) |
		    ((uint64_t)pccb->pdata[5] << 16) |
		    ((uint64_t)pccb->pdata[6] << 8)  |
		    ((uint64_t)pccb->pdata[7]);

	*blksz = ((uint64_t)pccb->pdata[8]  << 56) |
		 ((uint64_t)pccb->pdata[9]  << 48) |
		 ((uint64_t)pccb->pdata[10] << 40) |
		 ((uint64_t)pccb->pdata[11] << 32) |
		 ((uint64_t)pccb->pdata[12] << 24) |
		 ((uint64_t)pccb->pdata[13] << 16) |
		 ((uint64_t)pccb->pdata[14] << 8)  |
		 ((uint64_t)pccb->pdata[15]);

	return 0;
}


/*
 * Some setup (fill-in) routines
 */
static void scsi_setup_test_unit_ready(struct scsi_cmd *pccb)
{
	pccb->cmd[0] = SCSI_TST_U_RDY;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = 0;
	pccb->cmd[3] = 0;
	pccb->cmd[4] = 0;
	pccb->cmd[5] = 0;
	pccb->cmdlen = 6;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
}

/**
 * scsi_init_dev_desc_priv - initialize only SCSI specific blk_desc properties
 *
 * @dev_desc: Block device description pointer
 */
static void scsi_init_dev_desc_priv(struct blk_desc *dev_desc)
{
	dev_desc->target = 0xff;
	dev_desc->lun = 0xff;
	dev_desc->log2blksz =
		LOG2_INVALID(typeof(dev_desc->log2blksz));
	dev_desc->type = DEV_TYPE_UNKNOWN;
	dev_desc->vendor[0] = 0;
	dev_desc->product[0] = 0;
	dev_desc->revision[0] = 0;
	dev_desc->removable = false;
#ifndef CONFIG_BLK
	dev_desc->block_read = scsi_read;
	dev_desc->block_write = scsi_write;
#endif
}

#if !defined(CONFIG_DM_SCSI)
/**
 * scsi_init_dev_desc - initialize all SCSI specific blk_desc properties
 *
 * @dev_desc: Block device description pointer
 * @devnum: Device number
 */
static void scsi_init_dev_desc(struct blk_desc *dev_desc, int devnum)
{
	dev_desc->lba = 0;
	dev_desc->blksz = 0;
	dev_desc->if_type = IF_TYPE_SCSI;
	dev_desc->devnum = devnum;
	dev_desc->part_type = PART_TYPE_UNKNOWN;

	scsi_init_dev_desc_priv(dev_desc);
}
#endif

/**
 * scsi_detect_dev - Detect scsi device
 *
 * @target: target id
 * @lun: target lun
 * @dev_desc: block device description
 *
 * The scsi_detect_dev detects and fills a dev_desc structure when the device is
 * detected.
 *
 * Return: 0 on success, error value otherwise
 */
static int scsi_detect_dev(struct udevice *dev, int target, int lun,
			   struct blk_desc *dev_desc)
{
	unsigned char perq, modi;
	lbaint_t capacity;
	unsigned long blksz;
	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;

	pccb->target = target;
	pccb->lun = lun;
	pccb->pdata = (unsigned char *)&tempbuff;
	pccb->datalen = 512;
	scsi_setup_inquiry(pccb);
	if (scsi_exec(dev, pccb) != true) {
		if (pccb->contr_stat == SCSI_SEL_TIME_OUT) {
			/*
			  * selection timeout => assuming no
			  * device present
			  */
			debug("Selection timeout ID %d\n",
			      pccb->target);
			return -ETIMEDOUT;
		}
		scsi_print_error(pccb);
		return -ENODEV;
	}
	perq = tempbuff[0];
	modi = tempbuff[1];
	if ((perq & 0x1f) == 0x1f)
		return -ENODEV; /* skip unknown devices */
	if ((modi & 0x80) == 0x80) /* drive is removable */
		dev_desc->removable = true;
	/* get info for this device */
	scsi_ident_cpy((unsigned char *)dev_desc->vendor,
		       &tempbuff[8], 8);
	scsi_ident_cpy((unsigned char *)dev_desc->product,
		       &tempbuff[16], 16);
	scsi_ident_cpy((unsigned char *)dev_desc->revision,
		       &tempbuff[32], 4);
	dev_desc->target = pccb->target;
	dev_desc->lun = pccb->lun;

	pccb->datalen = 0;
	scsi_setup_test_unit_ready(pccb);
	if (scsi_exec(dev, pccb) != true) {
		if (dev_desc->removable) {
			dev_desc->type = perq;
			goto removable;
		}
		scsi_print_error(pccb);
		return -EINVAL;
	}
	if (scsi_read_capacity(dev, pccb, &capacity, &blksz)) {
		scsi_print_error(pccb);
		return -EINVAL;
	}
	dev_desc->lba = capacity;
	dev_desc->blksz = blksz;
	dev_desc->log2blksz = LOG2(dev_desc->blksz);
	dev_desc->type = perq;
removable:
	return 0;
}

/*
 * (re)-scan the scsi bus and reports scsi device info
 * to the user if mode = 1
 */
#if defined(CONFIG_DM_SCSI)
static int do_scsi_scan_one(struct udevice *dev, int id, int lun, int mode)
{
	int ret;
	struct udevice *bdev;
	struct blk_desc bd;
	struct blk_desc *bdesc;
	char str[10];

	/*
	 * detect the scsi driver to get information about its geometry (block
	 * size, number of blocks) and other parameters (ids, type, ...)
	 */
	scsi_init_dev_desc_priv(&bd);
	if (scsi_detect_dev(dev, id, lun, &bd))
		return -ENODEV;

	/*
	* Create only one block device and do detection
	* to make sure that there won't be a lot of
	* block devices created
	*/
	snprintf(str, sizeof(str), "id%dlun%d", id, lun);
	ret = blk_create_devicef(dev, "scsi_blk", str, IF_TYPE_SCSI, -1,
			bd.blksz, bd.blksz * bd.lba, &bdev);
	if (ret) {
		debug("Can't create device\n");
		return ret;
	}

	bdesc = dev_get_uclass_platdata(bdev);
	bdesc->target = id;
	bdesc->lun = lun;
	bdesc->removable = bd.removable;
	bdesc->type = bd.type;
	memcpy(&bdesc->vendor, &bd.vendor, sizeof(bd.vendor));
	memcpy(&bdesc->product, &bd.product, sizeof(bd.product));
	memcpy(&bdesc->revision, &bd.revision,	sizeof(bd.revision));
	part_init(bdesc);

	if (mode == 1) {
		printf("  Device %d: ", 0);
		dev_print(bdesc);
	}
	return 0;
}

int scsi_scan(int mode)
{
	unsigned char i, lun;
	struct uclass *uc;
	struct udevice *dev; /* SCSI controller */
	int ret;

	if (mode == 1)
		printf("scanning bus for devices...\n");

	blk_unbind_all(IF_TYPE_SCSI);

	ret = uclass_get(UCLASS_SCSI, &uc);
	if (ret)
		return ret;

	uclass_foreach_dev(dev, uc) {
		struct scsi_platdata *plat; /* scsi controller platdata */

		/* probe SCSI controller driver */
		ret = device_probe(dev);
		if (ret)
			return ret;

		/* Get controller platdata */
		plat = dev_get_uclass_platdata(dev);

		for (i = 0; i < plat->max_id; i++)
			for (lun = 0; lun < plat->max_lun; lun++)
				do_scsi_scan_one(dev, i, lun, mode);
	}

	return 0;
}
#else
int scsi_scan(int mode)
{
	unsigned char i, lun;
	int ret;

	if (mode == 1)
		printf("scanning bus for devices...\n");
	for (i = 0; i < CONFIG_SYS_SCSI_MAX_DEVICE; i++)
		scsi_init_dev_desc(&scsi_dev_desc[i], i);

	scsi_max_devs = 0;
	for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
		for (lun = 0; lun < CONFIG_SYS_SCSI_MAX_LUN; lun++) {
			ret = scsi_detect_dev(NULL, i, lun,
					      &scsi_dev_desc[scsi_max_devs]);
			if (ret)
				continue;
			part_init(&scsi_dev_desc[scsi_max_devs]);

			if (mode == 1) {
				printf("  Device %d: ", 0);
				dev_print(&scsi_dev_desc[scsi_max_devs]);
			} /* if mode */
			scsi_max_devs++;
		} /* next LUN */
	}
	if (scsi_max_devs > 0)
		scsi_curr_dev = 0;
	else
		scsi_curr_dev = -1;

	printf("Found %d device(s).\n", scsi_max_devs);
#ifndef CONFIG_SPL_BUILD
	setenv_ulong("scsidevs", scsi_max_devs);
#endif
	return 0;
}
#endif

#ifdef CONFIG_BLK
static const struct blk_ops scsi_blk_ops = {
	.read	= scsi_read,
	.write	= scsi_write,
};

U_BOOT_DRIVER(scsi_blk) = {
	.name		= "scsi_blk",
	.id		= UCLASS_BLK,
	.ops		= &scsi_blk_ops,
};
#else
U_BOOT_LEGACY_BLK(scsi) = {
	.if_typename	= "scsi",
	.if_type	= IF_TYPE_SCSI,
	.max_devs	= CONFIG_SYS_SCSI_MAX_DEVICE,
	.desc		= scsi_dev_desc,
};
#endif