xref: /openbmc/u-boot/drivers/scsi/scsi.c (revision 4ebcb16b)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2001
4  * Denis Peter, MPL AG Switzerland
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <pci.h>
10 #include <scsi.h>
11 #include <dm/device-internal.h>
12 #include <dm/uclass-internal.h>
13 
14 #if !defined(CONFIG_DM_SCSI)
15 # ifdef CONFIG_SCSI_DEV_LIST
16 #  define SCSI_DEV_LIST CONFIG_SCSI_DEV_LIST
17 # else
18 #  ifdef CONFIG_SATA_ULI5288
19 
20 #   define SCSI_VEND_ID 0x10b9
21 #   define SCSI_DEV_ID  0x5288
22 
23 #  elif !defined(CONFIG_SCSI_AHCI_PLAT)
24 #   error no scsi device defined
25 #  endif
26 # define SCSI_DEV_LIST {SCSI_VEND_ID, SCSI_DEV_ID}
27 # endif
28 #endif
29 
30 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT) && \
31 	!defined(CONFIG_DM_SCSI)
32 const struct pci_device_id scsi_device_list[] = { SCSI_DEV_LIST };
33 #endif
34 static struct scsi_cmd tempccb;	/* temporary scsi command buffer */
35 
36 static unsigned char tempbuff[512]; /* temporary data buffer */
37 
38 #if !defined(CONFIG_DM_SCSI)
39 static int scsi_max_devs; /* number of highest available scsi device */
40 
41 static int scsi_curr_dev; /* current device */
42 
43 static struct blk_desc scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE];
44 #endif
45 
46 /* almost the maximum amount of the scsi_ext command.. */
47 #define SCSI_MAX_READ_BLK 0xFFFF
48 #define SCSI_LBA48_READ	0xFFFFFFF
49 
50 static void scsi_print_error(struct scsi_cmd *pccb)
51 {
52 	/* Dummy function that could print an error for debugging */
53 }
54 
55 #ifdef CONFIG_SYS_64BIT_LBA
56 void scsi_setup_read16(struct scsi_cmd *pccb, lbaint_t start,
57 		       unsigned long blocks)
58 {
59 	pccb->cmd[0] = SCSI_READ16;
60 	pccb->cmd[1] = pccb->lun << 5;
61 	pccb->cmd[2] = (unsigned char)(start >> 56) & 0xff;
62 	pccb->cmd[3] = (unsigned char)(start >> 48) & 0xff;
63 	pccb->cmd[4] = (unsigned char)(start >> 40) & 0xff;
64 	pccb->cmd[5] = (unsigned char)(start >> 32) & 0xff;
65 	pccb->cmd[6] = (unsigned char)(start >> 24) & 0xff;
66 	pccb->cmd[7] = (unsigned char)(start >> 16) & 0xff;
67 	pccb->cmd[8] = (unsigned char)(start >> 8) & 0xff;
68 	pccb->cmd[9] = (unsigned char)start & 0xff;
69 	pccb->cmd[10] = 0;
70 	pccb->cmd[11] = (unsigned char)(blocks >> 24) & 0xff;
71 	pccb->cmd[12] = (unsigned char)(blocks >> 16) & 0xff;
72 	pccb->cmd[13] = (unsigned char)(blocks >> 8) & 0xff;
73 	pccb->cmd[14] = (unsigned char)blocks & 0xff;
74 	pccb->cmd[15] = 0;
75 	pccb->cmdlen = 16;
76 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
77 	debug("scsi_setup_read16: cmd: %02X %02X startblk %02X%02X%02X%02X%02X%02X%02X%02X blccnt %02X%02X%02X%02X\n",
78 	      pccb->cmd[0], pccb->cmd[1],
79 	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
80 	      pccb->cmd[6], pccb->cmd[7], pccb->cmd[8], pccb->cmd[9],
81 	      pccb->cmd[11], pccb->cmd[12], pccb->cmd[13], pccb->cmd[14]);
82 }
83 #endif
84 
85 static void scsi_setup_read_ext(struct scsi_cmd *pccb, lbaint_t start,
86 				unsigned short blocks)
87 {
88 	pccb->cmd[0] = SCSI_READ10;
89 	pccb->cmd[1] = pccb->lun << 5;
90 	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
91 	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
92 	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
93 	pccb->cmd[5] = (unsigned char)start & 0xff;
94 	pccb->cmd[6] = 0;
95 	pccb->cmd[7] = (unsigned char)(blocks >> 8) & 0xff;
96 	pccb->cmd[8] = (unsigned char)blocks & 0xff;
97 	pccb->cmd[6] = 0;
98 	pccb->cmdlen = 10;
99 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
100 	debug("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
101 	      pccb->cmd[0], pccb->cmd[1],
102 	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
103 	      pccb->cmd[7], pccb->cmd[8]);
104 }
105 
106 static void scsi_setup_write_ext(struct scsi_cmd *pccb, lbaint_t start,
107 				 unsigned short blocks)
108 {
109 	pccb->cmd[0] = SCSI_WRITE10;
110 	pccb->cmd[1] = pccb->lun << 5;
111 	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
112 	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
113 	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
114 	pccb->cmd[5] = (unsigned char)start & 0xff;
115 	pccb->cmd[6] = 0;
116 	pccb->cmd[7] = ((unsigned char)(blocks >> 8)) & 0xff;
117 	pccb->cmd[8] = (unsigned char)blocks & 0xff;
118 	pccb->cmd[9] = 0;
119 	pccb->cmdlen = 10;
120 	pccb->msgout[0] = SCSI_IDENTIFY;  /* NOT USED */
121 	debug("%s: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
122 	      __func__,
123 	      pccb->cmd[0], pccb->cmd[1],
124 	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
125 	      pccb->cmd[7], pccb->cmd[8]);
126 }
127 
128 static void scsi_setup_inquiry(struct scsi_cmd *pccb)
129 {
130 	pccb->cmd[0] = SCSI_INQUIRY;
131 	pccb->cmd[1] = pccb->lun << 5;
132 	pccb->cmd[2] = 0;
133 	pccb->cmd[3] = 0;
134 	if (pccb->datalen > 255)
135 		pccb->cmd[4] = 255;
136 	else
137 		pccb->cmd[4] = (unsigned char)pccb->datalen;
138 	pccb->cmd[5] = 0;
139 	pccb->cmdlen = 6;
140 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
141 }
142 
143 #ifdef CONFIG_BLK
144 static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
145 		       void *buffer)
146 #else
147 static ulong scsi_read(struct blk_desc *block_dev, lbaint_t blknr,
148 		       lbaint_t blkcnt, void *buffer)
149 #endif
150 {
151 #ifdef CONFIG_BLK
152 	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
153 	struct udevice *bdev = dev->parent;
154 #else
155 	struct udevice *bdev = NULL;
156 #endif
157 	lbaint_t start, blks;
158 	uintptr_t buf_addr;
159 	unsigned short smallblks = 0;
160 	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;
161 
162 	/* Setup device */
163 	pccb->target = block_dev->target;
164 	pccb->lun = block_dev->lun;
165 	buf_addr = (unsigned long)buffer;
166 	start = blknr;
167 	blks = blkcnt;
168 	debug("\nscsi_read: dev %d startblk " LBAF
169 	      ", blccnt " LBAF " buffer %lx\n",
170 	      block_dev->devnum, start, blks, (unsigned long)buffer);
171 	do {
172 		pccb->pdata = (unsigned char *)buf_addr;
173 #ifdef CONFIG_SYS_64BIT_LBA
174 		if (start > SCSI_LBA48_READ) {
175 			unsigned long blocks;
176 			blocks = min_t(lbaint_t, blks, SCSI_MAX_READ_BLK);
177 			pccb->datalen = block_dev->blksz * blocks;
178 			scsi_setup_read16(pccb, start, blocks);
179 			start += blocks;
180 			blks -= blocks;
181 		} else
182 #endif
183 		if (blks > SCSI_MAX_READ_BLK) {
184 			pccb->datalen = block_dev->blksz *
185 				SCSI_MAX_READ_BLK;
186 			smallblks = SCSI_MAX_READ_BLK;
187 			scsi_setup_read_ext(pccb, start, smallblks);
188 			start += SCSI_MAX_READ_BLK;
189 			blks -= SCSI_MAX_READ_BLK;
190 		} else {
191 			pccb->datalen = block_dev->blksz * blks;
192 			smallblks = (unsigned short)blks;
193 			scsi_setup_read_ext(pccb, start, smallblks);
194 			start += blks;
195 			blks = 0;
196 		}
197 		debug("scsi_read_ext: startblk " LBAF
198 		      ", blccnt %x buffer %lX\n",
199 		      start, smallblks, buf_addr);
200 		if (scsi_exec(bdev, pccb)) {
201 			scsi_print_error(pccb);
202 			blkcnt -= blks;
203 			break;
204 		}
205 		buf_addr += pccb->datalen;
206 	} while (blks != 0);
207 	debug("scsi_read_ext: end startblk " LBAF
208 	      ", blccnt %x buffer %lX\n", start, smallblks, buf_addr);
209 	return blkcnt;
210 }
211 
212 /*******************************************************************************
213  * scsi_write
214  */
215 
216 /* Almost the maximum amount of the scsi_ext command.. */
217 #define SCSI_MAX_WRITE_BLK 0xFFFF
218 
219 #ifdef CONFIG_BLK
220 static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
221 			const void *buffer)
222 #else
223 static ulong scsi_write(struct blk_desc *block_dev, lbaint_t blknr,
224 			lbaint_t blkcnt, const void *buffer)
225 #endif
226 {
227 #ifdef CONFIG_BLK
228 	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
229 	struct udevice *bdev = dev->parent;
230 #else
231 	struct udevice *bdev = NULL;
232 #endif
233 	lbaint_t start, blks;
234 	uintptr_t buf_addr;
235 	unsigned short smallblks;
236 	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;
237 
238 	/* Setup device */
239 	pccb->target = block_dev->target;
240 	pccb->lun = block_dev->lun;
241 	buf_addr = (unsigned long)buffer;
242 	start = blknr;
243 	blks = blkcnt;
244 	debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
245 	      __func__, block_dev->devnum, start, blks, (unsigned long)buffer);
246 	do {
247 		pccb->pdata = (unsigned char *)buf_addr;
248 		if (blks > SCSI_MAX_WRITE_BLK) {
249 			pccb->datalen = (block_dev->blksz *
250 					 SCSI_MAX_WRITE_BLK);
251 			smallblks = SCSI_MAX_WRITE_BLK;
252 			scsi_setup_write_ext(pccb, start, smallblks);
253 			start += SCSI_MAX_WRITE_BLK;
254 			blks -= SCSI_MAX_WRITE_BLK;
255 		} else {
256 			pccb->datalen = block_dev->blksz * blks;
257 			smallblks = (unsigned short)blks;
258 			scsi_setup_write_ext(pccb, start, smallblks);
259 			start += blks;
260 			blks = 0;
261 		}
262 		debug("%s: startblk " LBAF ", blccnt %x buffer %lx\n",
263 		      __func__, start, smallblks, buf_addr);
264 		if (scsi_exec(bdev, pccb)) {
265 			scsi_print_error(pccb);
266 			blkcnt -= blks;
267 			break;
268 		}
269 		buf_addr += pccb->datalen;
270 	} while (blks != 0);
271 	debug("%s: end startblk " LBAF ", blccnt %x buffer %lX\n",
272 	      __func__, start, smallblks, buf_addr);
273 	return blkcnt;
274 }
275 
276 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT) && \
277 	!defined(CONFIG_DM_SCSI)
278 void scsi_init(void)
279 {
280 	int busdevfunc = -1;
281 	int i;
282 	/*
283 	 * Find a device from the list, this driver will support a single
284 	 * controller.
285 	 */
286 	for (i = 0; i < ARRAY_SIZE(scsi_device_list); i++) {
287 		/* get PCI Device ID */
288 #ifdef CONFIG_DM_PCI
289 		struct udevice *dev;
290 		int ret;
291 
292 		ret = dm_pci_find_device(scsi_device_list[i].vendor,
293 					 scsi_device_list[i].device, 0, &dev);
294 		if (!ret) {
295 			busdevfunc = dm_pci_get_bdf(dev);
296 			break;
297 		}
298 #else
299 		busdevfunc = pci_find_device(scsi_device_list[i].vendor,
300 					     scsi_device_list[i].device,
301 					     0);
302 #endif
303 		if (busdevfunc != -1)
304 			break;
305 	}
306 
307 	if (busdevfunc == -1) {
308 		printf("Error: SCSI Controller(s) ");
309 		for (i = 0; i < ARRAY_SIZE(scsi_device_list); i++) {
310 			printf("%04X:%04X ",
311 			       scsi_device_list[i].vendor,
312 			       scsi_device_list[i].device);
313 		}
314 		printf("not found\n");
315 		return;
316 	}
317 #ifdef DEBUG
318 	else {
319 		printf("SCSI Controller (%04X,%04X) found (%d:%d:%d)\n",
320 		       scsi_device_list[i].vendor,
321 		       scsi_device_list[i].device,
322 		       (busdevfunc >> 16) & 0xFF,
323 		       (busdevfunc >> 11) & 0x1F,
324 		       (busdevfunc >> 8) & 0x7);
325 	}
326 #endif
327 	bootstage_start(BOOTSTAGE_ID_ACCUM_SCSI, "ahci");
328 	scsi_low_level_init(busdevfunc);
329 	scsi_scan(true);
330 	bootstage_accum(BOOTSTAGE_ID_ACCUM_SCSI);
331 }
332 #endif
333 
334 /* copy src to dest, skipping leading and trailing blanks
335  * and null terminate the string
336  */
337 static void scsi_ident_cpy(unsigned char *dest, unsigned char *src,
338 			   unsigned int len)
339 {
340 	int start, end;
341 
342 	start = 0;
343 	while (start < len) {
344 		if (src[start] != ' ')
345 			break;
346 		start++;
347 	}
348 	end = len-1;
349 	while (end > start) {
350 		if (src[end] != ' ')
351 			break;
352 		end--;
353 	}
354 	for (; start <= end; start++)
355 		*dest ++= src[start];
356 	*dest = '\0';
357 }
358 
359 static int scsi_read_capacity(struct udevice *dev, struct scsi_cmd *pccb,
360 			      lbaint_t *capacity, unsigned long *blksz)
361 {
362 	*capacity = 0;
363 
364 	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
365 	pccb->cmd[0] = SCSI_RD_CAPAC10;
366 	pccb->cmd[1] = pccb->lun << 5;
367 	pccb->cmdlen = 10;
368 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
369 
370 	pccb->datalen = 8;
371 	if (scsi_exec(dev, pccb))
372 		return 1;
373 
374 	*capacity = ((lbaint_t)pccb->pdata[0] << 24) |
375 		    ((lbaint_t)pccb->pdata[1] << 16) |
376 		    ((lbaint_t)pccb->pdata[2] << 8)  |
377 		    ((lbaint_t)pccb->pdata[3]);
378 
379 	if (*capacity != 0xffffffff) {
380 		/* Read capacity (10) was sufficient for this drive. */
381 		*blksz = ((unsigned long)pccb->pdata[4] << 24) |
382 			 ((unsigned long)pccb->pdata[5] << 16) |
383 			 ((unsigned long)pccb->pdata[6] << 8)  |
384 			 ((unsigned long)pccb->pdata[7]);
385 		return 0;
386 	}
387 
388 	/* Read capacity (10) was insufficient. Use read capacity (16). */
389 	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
390 	pccb->cmd[0] = SCSI_RD_CAPAC16;
391 	pccb->cmd[1] = 0x10;
392 	pccb->cmdlen = 16;
393 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
394 
395 	pccb->datalen = 16;
396 	if (scsi_exec(dev, pccb))
397 		return 1;
398 
399 	*capacity = ((uint64_t)pccb->pdata[0] << 56) |
400 		    ((uint64_t)pccb->pdata[1] << 48) |
401 		    ((uint64_t)pccb->pdata[2] << 40) |
402 		    ((uint64_t)pccb->pdata[3] << 32) |
403 		    ((uint64_t)pccb->pdata[4] << 24) |
404 		    ((uint64_t)pccb->pdata[5] << 16) |
405 		    ((uint64_t)pccb->pdata[6] << 8)  |
406 		    ((uint64_t)pccb->pdata[7]);
407 
408 	*blksz = ((uint64_t)pccb->pdata[8]  << 56) |
409 		 ((uint64_t)pccb->pdata[9]  << 48) |
410 		 ((uint64_t)pccb->pdata[10] << 40) |
411 		 ((uint64_t)pccb->pdata[11] << 32) |
412 		 ((uint64_t)pccb->pdata[12] << 24) |
413 		 ((uint64_t)pccb->pdata[13] << 16) |
414 		 ((uint64_t)pccb->pdata[14] << 8)  |
415 		 ((uint64_t)pccb->pdata[15]);
416 
417 	return 0;
418 }
419 
420 
421 /*
422  * Some setup (fill-in) routines
423  */
424 static void scsi_setup_test_unit_ready(struct scsi_cmd *pccb)
425 {
426 	pccb->cmd[0] = SCSI_TST_U_RDY;
427 	pccb->cmd[1] = pccb->lun << 5;
428 	pccb->cmd[2] = 0;
429 	pccb->cmd[3] = 0;
430 	pccb->cmd[4] = 0;
431 	pccb->cmd[5] = 0;
432 	pccb->cmdlen = 6;
433 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
434 }
435 
436 /**
437  * scsi_init_dev_desc_priv - initialize only SCSI specific blk_desc properties
438  *
439  * @dev_desc: Block device description pointer
440  */
441 static void scsi_init_dev_desc_priv(struct blk_desc *dev_desc)
442 {
443 	dev_desc->target = 0xff;
444 	dev_desc->lun = 0xff;
445 	dev_desc->log2blksz =
446 		LOG2_INVALID(typeof(dev_desc->log2blksz));
447 	dev_desc->type = DEV_TYPE_UNKNOWN;
448 	dev_desc->vendor[0] = 0;
449 	dev_desc->product[0] = 0;
450 	dev_desc->revision[0] = 0;
451 	dev_desc->removable = false;
452 #if !CONFIG_IS_ENABLED(BLK)
453 	dev_desc->block_read = scsi_read;
454 	dev_desc->block_write = scsi_write;
455 #endif
456 }
457 
458 #if !defined(CONFIG_DM_SCSI)
459 /**
460  * scsi_init_dev_desc - initialize all SCSI specific blk_desc properties
461  *
462  * @dev_desc: Block device description pointer
463  * @devnum: Device number
464  */
465 static void scsi_init_dev_desc(struct blk_desc *dev_desc, int devnum)
466 {
467 	dev_desc->lba = 0;
468 	dev_desc->blksz = 0;
469 	dev_desc->if_type = IF_TYPE_SCSI;
470 	dev_desc->devnum = devnum;
471 	dev_desc->part_type = PART_TYPE_UNKNOWN;
472 
473 	scsi_init_dev_desc_priv(dev_desc);
474 }
475 #endif
476 
477 /**
478  * scsi_detect_dev - Detect scsi device
479  *
480  * @target: target id
481  * @lun: target lun
482  * @dev_desc: block device description
483  *
484  * The scsi_detect_dev detects and fills a dev_desc structure when the device is
485  * detected.
486  *
487  * Return: 0 on success, error value otherwise
488  */
489 static int scsi_detect_dev(struct udevice *dev, int target, int lun,
490 			   struct blk_desc *dev_desc)
491 {
492 	unsigned char perq, modi;
493 	lbaint_t capacity;
494 	unsigned long blksz;
495 	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;
496 
497 	pccb->target = target;
498 	pccb->lun = lun;
499 	pccb->pdata = (unsigned char *)&tempbuff;
500 	pccb->datalen = 512;
501 	scsi_setup_inquiry(pccb);
502 	if (scsi_exec(dev, pccb)) {
503 		if (pccb->contr_stat == SCSI_SEL_TIME_OUT) {
504 			/*
505 			  * selection timeout => assuming no
506 			  * device present
507 			  */
508 			debug("Selection timeout ID %d\n",
509 			      pccb->target);
510 			return -ETIMEDOUT;
511 		}
512 		scsi_print_error(pccb);
513 		return -ENODEV;
514 	}
515 	perq = tempbuff[0];
516 	modi = tempbuff[1];
517 	if ((perq & 0x1f) == 0x1f)
518 		return -ENODEV; /* skip unknown devices */
519 	if ((modi & 0x80) == 0x80) /* drive is removable */
520 		dev_desc->removable = true;
521 	/* get info for this device */
522 	scsi_ident_cpy((unsigned char *)dev_desc->vendor,
523 		       &tempbuff[8], 8);
524 	scsi_ident_cpy((unsigned char *)dev_desc->product,
525 		       &tempbuff[16], 16);
526 	scsi_ident_cpy((unsigned char *)dev_desc->revision,
527 		       &tempbuff[32], 4);
528 	dev_desc->target = pccb->target;
529 	dev_desc->lun = pccb->lun;
530 
531 	pccb->datalen = 0;
532 	scsi_setup_test_unit_ready(pccb);
533 	if (scsi_exec(dev, pccb)) {
534 		if (dev_desc->removable) {
535 			dev_desc->type = perq;
536 			goto removable;
537 		}
538 		scsi_print_error(pccb);
539 		return -EINVAL;
540 	}
541 	if (scsi_read_capacity(dev, pccb, &capacity, &blksz)) {
542 		scsi_print_error(pccb);
543 		return -EINVAL;
544 	}
545 	dev_desc->lba = capacity;
546 	dev_desc->blksz = blksz;
547 	dev_desc->log2blksz = LOG2(dev_desc->blksz);
548 	dev_desc->type = perq;
549 removable:
550 	return 0;
551 }
552 
553 /*
554  * (re)-scan the scsi bus and reports scsi device info
555  * to the user if mode = 1
556  */
557 #if defined(CONFIG_DM_SCSI)
558 static int do_scsi_scan_one(struct udevice *dev, int id, int lun, bool verbose)
559 {
560 	int ret;
561 	struct udevice *bdev;
562 	struct blk_desc bd;
563 	struct blk_desc *bdesc;
564 	char str[10];
565 
566 	/*
567 	 * detect the scsi driver to get information about its geometry (block
568 	 * size, number of blocks) and other parameters (ids, type, ...)
569 	 */
570 	scsi_init_dev_desc_priv(&bd);
571 	if (scsi_detect_dev(dev, id, lun, &bd))
572 		return -ENODEV;
573 
574 	/*
575 	* Create only one block device and do detection
576 	* to make sure that there won't be a lot of
577 	* block devices created
578 	*/
579 	snprintf(str, sizeof(str), "id%dlun%d", id, lun);
580 	ret = blk_create_devicef(dev, "scsi_blk", str, IF_TYPE_SCSI, -1,
581 			bd.blksz, bd.lba, &bdev);
582 	if (ret) {
583 		debug("Can't create device\n");
584 		return ret;
585 	}
586 
587 	bdesc = dev_get_uclass_platdata(bdev);
588 	bdesc->target = id;
589 	bdesc->lun = lun;
590 	bdesc->removable = bd.removable;
591 	bdesc->type = bd.type;
592 	memcpy(&bdesc->vendor, &bd.vendor, sizeof(bd.vendor));
593 	memcpy(&bdesc->product, &bd.product, sizeof(bd.product));
594 	memcpy(&bdesc->revision, &bd.revision,	sizeof(bd.revision));
595 
596 	if (verbose) {
597 		printf("  Device %d: ", bdesc->devnum);
598 		dev_print(bdesc);
599 	}
600 	return 0;
601 }
602 
603 int scsi_scan_dev(struct udevice *dev, bool verbose)
604 {
605 	struct scsi_platdata *uc_plat; /* scsi controller platdata */
606 	int ret;
607 	int i;
608 	int lun;
609 
610 	/* probe SCSI controller driver */
611 	ret = device_probe(dev);
612 	if (ret)
613 		return ret;
614 
615 	/* Get controller platdata */
616 	uc_plat = dev_get_uclass_platdata(dev);
617 
618 	for (i = 0; i < uc_plat->max_id; i++)
619 		for (lun = 0; lun < uc_plat->max_lun; lun++)
620 			do_scsi_scan_one(dev, i, lun, verbose);
621 
622 	return 0;
623 }
624 
625 int scsi_scan(bool verbose)
626 {
627 	struct uclass *uc;
628 	struct udevice *dev; /* SCSI controller */
629 	int ret;
630 
631 	if (verbose)
632 		printf("scanning bus for devices...\n");
633 
634 	blk_unbind_all(IF_TYPE_SCSI);
635 
636 	ret = uclass_get(UCLASS_SCSI, &uc);
637 	if (ret)
638 		return ret;
639 
640 	uclass_foreach_dev(dev, uc) {
641 		ret = scsi_scan_dev(dev, verbose);
642 		if (ret)
643 			return ret;
644 	}
645 
646 	return 0;
647 }
648 #else
649 int scsi_scan(bool verbose)
650 {
651 	unsigned char i, lun;
652 	int ret;
653 
654 	if (verbose)
655 		printf("scanning bus for devices...\n");
656 	for (i = 0; i < CONFIG_SYS_SCSI_MAX_DEVICE; i++)
657 		scsi_init_dev_desc(&scsi_dev_desc[i], i);
658 
659 	scsi_max_devs = 0;
660 	for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
661 		for (lun = 0; lun < CONFIG_SYS_SCSI_MAX_LUN; lun++) {
662 			struct blk_desc *bdesc = &scsi_dev_desc[scsi_max_devs];
663 
664 			ret = scsi_detect_dev(NULL, i, lun, bdesc);
665 			if (ret)
666 				continue;
667 			part_init(bdesc);
668 
669 			if (verbose) {
670 				printf("  Device %d: ", bdesc->devnum);
671 				dev_print(bdesc);
672 			}
673 			scsi_max_devs++;
674 		} /* next LUN */
675 	}
676 	if (scsi_max_devs > 0)
677 		scsi_curr_dev = 0;
678 	else
679 		scsi_curr_dev = -1;
680 
681 	printf("Found %d device(s).\n", scsi_max_devs);
682 #ifndef CONFIG_SPL_BUILD
683 	env_set_ulong("scsidevs", scsi_max_devs);
684 #endif
685 	return 0;
686 }
687 #endif
688 
689 #ifdef CONFIG_BLK
690 static const struct blk_ops scsi_blk_ops = {
691 	.read	= scsi_read,
692 	.write	= scsi_write,
693 };
694 
695 U_BOOT_DRIVER(scsi_blk) = {
696 	.name		= "scsi_blk",
697 	.id		= UCLASS_BLK,
698 	.ops		= &scsi_blk_ops,
699 };
700 #else
701 U_BOOT_LEGACY_BLK(scsi) = {
702 	.if_typename	= "scsi",
703 	.if_type	= IF_TYPE_SCSI,
704 	.max_devs	= CONFIG_SYS_SCSI_MAX_DEVICE,
705 	.desc		= scsi_dev_desc,
706 };
707 #endif
708