git.sur5r.net Git - u-boot/blob - common/scsi.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <inttypes.h>
  11 #include <pci.h>
  12 #include <scsi.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/uclass-internal.h>
  15
  16 #if !defined(CONFIG_DM_SCSI)
  17 #ifdef CONFIG_SCSI_DEV_LIST
  18 #define SCSI_DEV_LIST CONFIG_SCSI_DEV_LIST
  19 #else
  20 #ifdef CONFIG_SCSI_SYM53C8XX
  21 #define SCSI_VEND_ID    0x1000
  22 #ifndef CONFIG_SCSI_DEV_ID
  23 #define SCSI_DEV_ID             0x0001
  24 #else
  25 #define SCSI_DEV_ID             CONFIG_SCSI_DEV_ID
  26 #endif
  27 #elif defined CONFIG_SATA_ULI5288
  28
  29 #define SCSI_VEND_ID 0x10b9
  30 #define SCSI_DEV_ID  0x5288
  31
  32 #elif !defined(CONFIG_SCSI_AHCI_PLAT)
  33 #error no scsi device defined
  34 #endif
  35 #define SCSI_DEV_LIST {SCSI_VEND_ID, SCSI_DEV_ID}
  36 #endif
  37 #endif
  38
  39 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
  40 const struct pci_device_id scsi_device_list[] = { SCSI_DEV_LIST };
  41 #endif
  42 static ccb tempccb;     /* temporary scsi command buffer */
  43
  44 static unsigned char tempbuff[512]; /* temporary data buffer */
  45
  46 #if !defined(CONFIG_DM_SCSI)
  47 static int scsi_max_devs; /* number of highest available scsi device */
  48
  49 static int scsi_curr_dev; /* current device */
  50
  51 static struct blk_desc scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE];
  52 #endif
  53
  54 /* almost the maximum amount of the scsi_ext command.. */
  55 #define SCSI_MAX_READ_BLK 0xFFFF
  56 #define SCSI_LBA48_READ 0xFFFFFFF
  57
  58 #ifdef CONFIG_SYS_64BIT_LBA
  59 void scsi_setup_read16(ccb *pccb, lbaint_t start, unsigned long blocks)
  60 {
  61         pccb->cmd[0] = SCSI_READ16;
  62         pccb->cmd[1] = pccb->lun << 5;
  63         pccb->cmd[2] = (unsigned char)(start >> 56) & 0xff;
  64         pccb->cmd[3] = (unsigned char)(start >> 48) & 0xff;
  65         pccb->cmd[4] = (unsigned char)(start >> 40) & 0xff;
  66         pccb->cmd[5] = (unsigned char)(start >> 32) & 0xff;
  67         pccb->cmd[6] = (unsigned char)(start >> 24) & 0xff;
  68         pccb->cmd[7] = (unsigned char)(start >> 16) & 0xff;
  69         pccb->cmd[8] = (unsigned char)(start >> 8) & 0xff;
  70         pccb->cmd[9] = (unsigned char)start & 0xff;
  71         pccb->cmd[10] = 0;
  72         pccb->cmd[11] = (unsigned char)(blocks >> 24) & 0xff;
  73         pccb->cmd[12] = (unsigned char)(blocks >> 16) & 0xff;
  74         pccb->cmd[13] = (unsigned char)(blocks >> 8) & 0xff;
  75         pccb->cmd[14] = (unsigned char)blocks & 0xff;
  76         pccb->cmd[15] = 0;
  77         pccb->cmdlen = 16;
  78         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
  79         debug("scsi_setup_read16: cmd: %02X %02X startblk %02X%02X%02X%02X%02X%02X%02X%02X blccnt %02X%02X%02X%02X\n",
  80               pccb->cmd[0], pccb->cmd[1],
  81               pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
  82               pccb->cmd[6], pccb->cmd[7], pccb->cmd[8], pccb->cmd[9],
  83               pccb->cmd[11], pccb->cmd[12], pccb->cmd[13], pccb->cmd[14]);
  84 }
  85 #endif
  86
  87 static void scsi_setup_read_ext(ccb *pccb, lbaint_t start,
  88                                 unsigned short blocks)
  89 {
  90         pccb->cmd[0] = SCSI_READ10;
  91         pccb->cmd[1] = pccb->lun << 5;
  92         pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
  93         pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
  94         pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
  95         pccb->cmd[5] = (unsigned char)start & 0xff;
  96         pccb->cmd[6] = 0;
  97         pccb->cmd[7] = (unsigned char)(blocks >> 8) & 0xff;
  98         pccb->cmd[8] = (unsigned char)blocks & 0xff;
  99         pccb->cmd[6] = 0;
 100         pccb->cmdlen = 10;
 101         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 102         debug("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
 103               pccb->cmd[0], pccb->cmd[1],
 104               pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 105               pccb->cmd[7], pccb->cmd[8]);
 106 }
 107
 108 static void scsi_setup_write_ext(ccb *pccb, lbaint_t start,
 109                                  unsigned short blocks)
 110 {
 111         pccb->cmd[0] = SCSI_WRITE10;
 112         pccb->cmd[1] = pccb->lun << 5;
 113         pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
 114         pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
 115         pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
 116         pccb->cmd[5] = (unsigned char)start & 0xff;
 117         pccb->cmd[6] = 0;
 118         pccb->cmd[7] = ((unsigned char)(blocks >> 8)) & 0xff;
 119         pccb->cmd[8] = (unsigned char)blocks & 0xff;
 120         pccb->cmd[9] = 0;
 121         pccb->cmdlen = 10;
 122         pccb->msgout[0] = SCSI_IDENTIFY;  /* NOT USED */
 123         debug("%s: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
 124               __func__,
 125               pccb->cmd[0], pccb->cmd[1],
 126               pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 127               pccb->cmd[7], pccb->cmd[8]);
 128 }
 129
 130 static void scsi_setup_inquiry(ccb *pccb)
 131 {
 132         pccb->cmd[0] = SCSI_INQUIRY;
 133         pccb->cmd[1] = pccb->lun << 5;
 134         pccb->cmd[2] = 0;
 135         pccb->cmd[3] = 0;
 136         if (pccb->datalen > 255)
 137                 pccb->cmd[4] = 255;
 138         else
 139                 pccb->cmd[4] = (unsigned char)pccb->datalen;
 140         pccb->cmd[5] = 0;
 141         pccb->cmdlen = 6;
 142         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 143 }
 144
 145 #ifdef CONFIG_BLK
 146 static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 147                        void *buffer)
 148 #else
 149 static ulong scsi_read(struct blk_desc *block_dev, lbaint_t blknr,
 150                        lbaint_t blkcnt, void *buffer)
 151 #endif
 152 {
 153 #ifdef CONFIG_BLK
 154         struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
 155 #endif
 156         lbaint_t start, blks;
 157         uintptr_t buf_addr;
 158         unsigned short smallblks = 0;
 159         ccb *pccb = (ccb *)&tempccb;
 160
 161         /* Setup device */
 162         pccb->target = block_dev->target;
 163         pccb->lun = block_dev->lun;
 164         buf_addr = (unsigned long)buffer;
 165         start = blknr;
 166         blks = blkcnt;
 167         debug("\nscsi_read: dev %d startblk " LBAF
 168               ", blccnt " LBAF " buffer %lx\n",
 169               block_dev->devnum, start, blks, (unsigned long)buffer);
 170         do {
 171                 pccb->pdata = (unsigned char *)buf_addr;
 172 #ifdef CONFIG_SYS_64BIT_LBA
 173                 if (start > SCSI_LBA48_READ) {
 174                         unsigned long blocks;
 175                         blocks = min_t(lbaint_t, blks, SCSI_MAX_READ_BLK);
 176                         pccb->datalen = block_dev->blksz * blocks;
 177                         scsi_setup_read16(pccb, start, blocks);
 178                         start += blocks;
 179                         blks -= blocks;
 180                 } else
 181 #endif
 182                 if (blks > SCSI_MAX_READ_BLK) {
 183                         pccb->datalen = block_dev->blksz *
 184                                 SCSI_MAX_READ_BLK;
 185                         smallblks = SCSI_MAX_READ_BLK;
 186                         scsi_setup_read_ext(pccb, start, smallblks);
 187                         start += SCSI_MAX_READ_BLK;
 188                         blks -= SCSI_MAX_READ_BLK;
 189                 } else {
 190                         pccb->datalen = block_dev->blksz * blks;
 191                         smallblks = (unsigned short)blks;
 192                         scsi_setup_read_ext(pccb, start, smallblks);
 193                         start += blks;
 194                         blks = 0;
 195                 }
 196                 debug("scsi_read_ext: startblk " LBAF
 197                       ", blccnt %x buffer %" PRIXPTR "\n",
 198                       start, smallblks, buf_addr);
 199                 if (scsi_exec(pccb) != true) {
 200                         scsi_print_error(pccb);
 201                         blkcnt -= blks;
 202                         break;
 203                 }
 204                 buf_addr += pccb->datalen;
 205         } while (blks != 0);
 206         debug("scsi_read_ext: end startblk " LBAF
 207               ", blccnt %x buffer %" PRIXPTR "\n", start, smallblks, buf_addr);
 208         return blkcnt;
 209 }
 210
 211 /*******************************************************************************
 212  * scsi_write
 213  */
 214
 215 /* Almost the maximum amount of the scsi_ext command.. */
 216 #define SCSI_MAX_WRITE_BLK 0xFFFF
 217
 218 #ifdef CONFIG_BLK
 219 static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 220                         const void *buffer)
 221 #else
 222 static ulong scsi_write(struct blk_desc *block_dev, lbaint_t blknr,
 223                         lbaint_t blkcnt, const void *buffer)
 224 #endif
 225 {
 226 #ifdef CONFIG_BLK
 227         struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
 228 #endif
 229         lbaint_t start, blks;
 230         uintptr_t buf_addr;
 231         unsigned short smallblks;
 232         ccb *pccb = (ccb *)&tempccb;
 233
 234         /* Setup device */
 235         pccb->target = block_dev->target;
 236         pccb->lun = block_dev->lun;
 237         buf_addr = (unsigned long)buffer;
 238         start = blknr;
 239         blks = blkcnt;
 240         debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
 241               __func__, block_dev->devnum, start, blks, (unsigned long)buffer);
 242         do {
 243                 pccb->pdata = (unsigned char *)buf_addr;
 244                 if (blks > SCSI_MAX_WRITE_BLK) {
 245                         pccb->datalen = (block_dev->blksz *
 246                                          SCSI_MAX_WRITE_BLK);
 247                         smallblks = SCSI_MAX_WRITE_BLK;
 248                         scsi_setup_write_ext(pccb, start, smallblks);
 249                         start += SCSI_MAX_WRITE_BLK;
 250                         blks -= SCSI_MAX_WRITE_BLK;
 251                 } else {
 252                         pccb->datalen = block_dev->blksz * blks;
 253                         smallblks = (unsigned short)blks;
 254                         scsi_setup_write_ext(pccb, start, smallblks);
 255                         start += blks;
 256                         blks = 0;
 257                 }
 258                 debug("%s: startblk " LBAF ", blccnt %x buffer %" PRIXPTR "\n",
 259                       __func__, start, smallblks, buf_addr);
 260                 if (scsi_exec(pccb) != true) {
 261                         scsi_print_error(pccb);
 262                         blkcnt -= blks;
 263                         break;
 264                 }
 265                 buf_addr += pccb->datalen;
 266         } while (blks != 0);
 267         debug("%s: end startblk " LBAF ", blccnt %x buffer %" PRIXPTR "\n",
 268               __func__, start, smallblks, buf_addr);
 269         return blkcnt;
 270 }
 271
 272 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
 273 void scsi_init(void)
 274 {
 275         int busdevfunc = -1;
 276         int i;
 277         /*
 278          * Find a device from the list, this driver will support a single
 279          * controller.
 280          */
 281         for (i = 0; i < ARRAY_SIZE(scsi_device_list); i++) {
 282                 /* get PCI Device ID */
 283 #ifdef CONFIG_DM_PCI
 284                 struct udevice *dev;
 285                 int ret;
 286
 287                 ret = dm_pci_find_device(scsi_device_list[i].vendor,
 288                                          scsi_device_list[i].device, 0, &dev);
 289                 if (!ret) {
 290                         busdevfunc = dm_pci_get_bdf(dev);
 291                         break;
 292                 }
 293 #else
 294                 busdevfunc = pci_find_device(scsi_device_list[i].vendor,
 295                                              scsi_device_list[i].device,
 296                                              0);
 297 #endif
 298                 if (busdevfunc != -1)
 299                         break;
 300         }
 301
 302         if (busdevfunc == -1) {
 303                 printf("Error: SCSI Controller(s) ");
 304                 for (i = 0; i < ARRAY_SIZE(scsi_device_list); i++) {
 305                         printf("%04X:%04X ",
 306                                scsi_device_list[i].vendor,
 307                                scsi_device_list[i].device);
 308                 }
 309                 printf("not found\n");
 310                 return;
 311         }
 312 #ifdef DEBUG
 313         else {
 314                 printf("SCSI Controller (%04X,%04X) found (%d:%d:%d)\n",
 315                        scsi_device_list[i].vendor,
 316                        scsi_device_list[i].device,
 317                        (busdevfunc >> 16) & 0xFF,
 318                        (busdevfunc >> 11) & 0x1F,
 319                        (busdevfunc >> 8) & 0x7);
 320         }
 321 #endif
 322         bootstage_start(BOOTSTAGE_ID_ACCUM_SCSI, "ahci");
 323         scsi_low_level_init(busdevfunc);
 324         scsi_scan(1);
 325         bootstage_accum(BOOTSTAGE_ID_ACCUM_SCSI);
 326 }
 327 #endif
 328
 329 /* copy src to dest, skipping leading and trailing blanks
 330  * and null terminate the string
 331  */
 332 static void scsi_ident_cpy(unsigned char *dest, unsigned char *src,
 333                            unsigned int len)
 334 {
 335         int start, end;
 336
 337         start = 0;
 338         while (start < len) {
 339                 if (src[start] != ' ')
 340                         break;
 341                 start++;
 342         }
 343         end = len-1;
 344         while (end > start) {
 345                 if (src[end] != ' ')
 346                         break;
 347                 end--;
 348         }
 349         for (; start <= end; start++)
 350                 *dest ++= src[start];
 351         *dest = '\0';
 352 }
 353
 354 static int scsi_read_capacity(ccb *pccb, lbaint_t *capacity,
 355                               unsigned long *blksz)
 356 {
 357         *capacity = 0;
 358
 359         memset(pccb->cmd, '\0', sizeof(pccb->cmd));
 360         pccb->cmd[0] = SCSI_RD_CAPAC10;
 361         pccb->cmd[1] = pccb->lun << 5;
 362         pccb->cmdlen = 10;
 363         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 364
 365         pccb->datalen = 8;
 366         if (scsi_exec(pccb) != true)
 367                 return 1;
 368
 369         *capacity = ((lbaint_t)pccb->pdata[0] << 24) |
 370                     ((lbaint_t)pccb->pdata[1] << 16) |
 371                     ((lbaint_t)pccb->pdata[2] << 8)  |
 372                     ((lbaint_t)pccb->pdata[3]);
 373
 374         if (*capacity != 0xffffffff) {
 375                 /* Read capacity (10) was sufficient for this drive. */
 376                 *blksz = ((unsigned long)pccb->pdata[4] << 24) |
 377                          ((unsigned long)pccb->pdata[5] << 16) |
 378                          ((unsigned long)pccb->pdata[6] << 8)  |
 379                          ((unsigned long)pccb->pdata[7]);
 380                 return 0;
 381         }
 382
 383         /* Read capacity (10) was insufficient. Use read capacity (16). */
 384         memset(pccb->cmd, '\0', sizeof(pccb->cmd));
 385         pccb->cmd[0] = SCSI_RD_CAPAC16;
 386         pccb->cmd[1] = 0x10;
 387         pccb->cmdlen = 16;
 388         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 389
 390         pccb->datalen = 16;
 391         if (scsi_exec(pccb) != true)
 392                 return 1;
 393
 394         *capacity = ((uint64_t)pccb->pdata[0] << 56) |
 395                     ((uint64_t)pccb->pdata[1] << 48) |
 396                     ((uint64_t)pccb->pdata[2] << 40) |
 397                     ((uint64_t)pccb->pdata[3] << 32) |
 398                     ((uint64_t)pccb->pdata[4] << 24) |
 399                     ((uint64_t)pccb->pdata[5] << 16) |
 400                     ((uint64_t)pccb->pdata[6] << 8)  |
 401                     ((uint64_t)pccb->pdata[7]);
 402
 403         *blksz = ((uint64_t)pccb->pdata[8]  << 56) |
 404                  ((uint64_t)pccb->pdata[9]  << 48) |
 405                  ((uint64_t)pccb->pdata[10] << 40) |
 406                  ((uint64_t)pccb->pdata[11] << 32) |
 407                  ((uint64_t)pccb->pdata[12] << 24) |
 408                  ((uint64_t)pccb->pdata[13] << 16) |
 409                  ((uint64_t)pccb->pdata[14] << 8)  |
 410                  ((uint64_t)pccb->pdata[15]);
 411
 412         return 0;
 413 }
 414
 415
 416 /*
 417  * Some setup (fill-in) routines
 418  */
 419 static void scsi_setup_test_unit_ready(ccb *pccb)
 420 {
 421         pccb->cmd[0] = SCSI_TST_U_RDY;
 422         pccb->cmd[1] = pccb->lun << 5;
 423         pccb->cmd[2] = 0;
 424         pccb->cmd[3] = 0;
 425         pccb->cmd[4] = 0;
 426         pccb->cmd[5] = 0;
 427         pccb->cmdlen = 6;
 428         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 429 }
 430
 431 /**
 432  * scsi_init_dev_desc_priv - initialize only SCSI specific blk_desc properties
 433  *
 434  * @dev_desc: Block device description pointer
 435  */
 436 static void scsi_init_dev_desc_priv(struct blk_desc *dev_desc)
 437 {
 438         dev_desc->target = 0xff;
 439         dev_desc->lun = 0xff;
 440         dev_desc->log2blksz =
 441                 LOG2_INVALID(typeof(dev_desc->log2blksz));
 442         dev_desc->type = DEV_TYPE_UNKNOWN;
 443         dev_desc->vendor[0] = 0;
 444         dev_desc->product[0] = 0;
 445         dev_desc->revision[0] = 0;
 446         dev_desc->removable = false;
 447 #ifndef CONFIG_BLK
 448         dev_desc->block_read = scsi_read;
 449         dev_desc->block_write = scsi_write;
 450 #endif
 451 }
 452
 453 #if !defined(CONFIG_DM_SCSI)
 454 /**
 455  * scsi_init_dev_desc - initialize all SCSI specific blk_desc properties
 456  *
 457  * @dev_desc: Block device description pointer
 458  * @devnum: Device number
 459  */
 460 static void scsi_init_dev_desc(struct blk_desc *dev_desc, int devnum)
 461 {
 462         dev_desc->lba = 0;
 463         dev_desc->blksz = 0;
 464         dev_desc->if_type = IF_TYPE_SCSI;
 465         dev_desc->devnum = devnum;
 466         dev_desc->part_type = PART_TYPE_UNKNOWN;
 467
 468         scsi_init_dev_desc_priv(dev_desc);
 469 }
 470 #endif
 471
 472 /**
 473  * scsi_detect_dev - Detect scsi device
 474  *
 475  * @target: target id
 476  * @lun: target lun
 477  * @dev_desc: block device description
 478  *
 479  * The scsi_detect_dev detects and fills a dev_desc structure when the device is
 480  * detected.
 481  *
 482  * Return: 0 on success, error value otherwise
 483  */
 484 static int scsi_detect_dev(int target, int lun, struct blk_desc *dev_desc)
 485 {
 486         unsigned char perq, modi;
 487         lbaint_t capacity;
 488         unsigned long blksz;
 489         ccb *pccb = (ccb *)&tempccb;
 490
 491         pccb->target = target;
 492         pccb->lun = lun;
 493         pccb->pdata = (unsigned char *)&tempbuff;
 494         pccb->datalen = 512;
 495         scsi_setup_inquiry(pccb);
 496         if (scsi_exec(pccb) != true) {
 497                 if (pccb->contr_stat == SCSI_SEL_TIME_OUT) {
 498                         /*
 499                           * selection timeout => assuming no
 500                           * device present
 501                           */
 502                         debug("Selection timeout ID %d\n",
 503                               pccb->target);
 504                         return -ETIMEDOUT;
 505                 }
 506                 scsi_print_error(pccb);
 507                 return -ENODEV;
 508         }
 509         perq = tempbuff[0];
 510         modi = tempbuff[1];
 511         if ((perq & 0x1f) == 0x1f)
 512                 return -ENODEV; /* skip unknown devices */
 513         if ((modi & 0x80) == 0x80) /* drive is removable */
 514                 dev_desc->removable = true;
 515         /* get info for this device */
 516         scsi_ident_cpy((unsigned char *)dev_desc->vendor,
 517                        &tempbuff[8], 8);
 518         scsi_ident_cpy((unsigned char *)dev_desc->product,
 519                        &tempbuff[16], 16);
 520         scsi_ident_cpy((unsigned char *)dev_desc->revision,
 521                        &tempbuff[32], 4);
 522         dev_desc->target = pccb->target;
 523         dev_desc->lun = pccb->lun;
 524
 525         pccb->datalen = 0;
 526         scsi_setup_test_unit_ready(pccb);
 527         if (scsi_exec(pccb) != true) {
 528                 if (dev_desc->removable) {
 529                         dev_desc->type = perq;
 530                         goto removable;
 531                 }
 532                 scsi_print_error(pccb);
 533                 return -EINVAL;
 534         }
 535         if (scsi_read_capacity(pccb, &capacity, &blksz)) {
 536                 scsi_print_error(pccb);
 537                 return -EINVAL;
 538         }
 539         dev_desc->lba = capacity;
 540         dev_desc->blksz = blksz;
 541         dev_desc->log2blksz = LOG2(dev_desc->blksz);
 542         dev_desc->type = perq;
 543 removable:
 544         return 0;
 545 }
 546
 547 /*
 548  * (re)-scan the scsi bus and reports scsi device info
 549  * to the user if mode = 1
 550  */
 551 #if defined(CONFIG_DM_SCSI)
 552 int scsi_scan(int mode)
 553 {
 554         unsigned char i, lun;
 555         struct uclass *uc;
 556         struct udevice *dev; /* SCSI controller */
 557         int ret;
 558
 559         if (mode == 1)
 560                 printf("scanning bus for devices...\n");
 561
 562         blk_unbind_all(IF_TYPE_SCSI);
 563
 564         ret = uclass_get(UCLASS_SCSI, &uc);
 565         if (ret)
 566                 return ret;
 567
 568         uclass_foreach_dev(dev, uc) {
 569                 struct scsi_platdata *plat; /* scsi controller platdata */
 570
 571                 /* probe SCSI controller driver */
 572                 ret = device_probe(dev);
 573                 if (ret)
 574                         return ret;
 575
 576                 /* Get controller platdata */
 577                 plat = dev_get_platdata(dev);
 578
 579                 for (i = 0; i < plat->max_id; i++) {
 580                         for (lun = 0; lun < plat->max_lun; lun++) {
 581                                 struct udevice *bdev; /* block device */
 582                                 /* block device description */
 583                                 struct blk_desc _bd;
 584                                 struct blk_desc *bdesc;
 585                                 char str[10];
 586
 587                                 scsi_init_dev_desc_priv(&_bd);
 588                                 ret = scsi_detect_dev(i, lun, &_bd);
 589                                 if (ret)
 590                                         /*
 591                                          * no device detected?
 592                                          * check the next lun.
 593                                          */
 594                                         continue;
 595
 596                                 /*
 597                                  * Create only one block device and do detection
 598                                  * to make sure that there won't be a lot of
 599                                  * block devices created
 600                                  */
 601                                 snprintf(str, sizeof(str), "id%dlun%d", i, lun);
 602                                 ret = blk_create_devicef(dev, "scsi_blk",
 603                                                 str, IF_TYPE_SCSI,
 604                                                 -1,
 605                                                 _bd.blksz,
 606                                                 _bd.blksz * _bd.lba,
 607                                                 &bdev);
 608                                 if (ret) {
 609                                         debug("Can't create device\n");
 610                                         return ret;
 611                                 }
 612
 613                                 bdesc = dev_get_uclass_platdata(bdev);
 614                                 bdesc->target = i;
 615                                 bdesc->lun = lun;
 616                                 bdesc->removable = _bd.removable;
 617                                 bdesc->type = _bd.type;
 618                                 memcpy(&bdesc->vendor, &_bd.vendor,
 619                                        sizeof(_bd.vendor));
 620                                 memcpy(&bdesc->product, &_bd.product,
 621                                        sizeof(_bd.product));
 622                                 memcpy(&bdesc->revision, &_bd.revision,
 623                                        sizeof(_bd.revision));
 624                                 part_init(bdesc);
 625
 626                                 if (mode == 1) {
 627                                         printf("  Device %d: ", 0);
 628                                         dev_print(bdesc);
 629                                 } /* if mode */
 630                         } /* next LUN */
 631                 }
 632         }
 633
 634         return 0;
 635 }
 636 #else
 637 int scsi_scan(int mode)
 638 {
 639         unsigned char i, lun;
 640         int ret;
 641
 642         if (mode == 1)
 643                 printf("scanning bus for devices...\n");
 644         for (i = 0; i < CONFIG_SYS_SCSI_MAX_DEVICE; i++)
 645                 scsi_init_dev_desc(&scsi_dev_desc[i], i);
 646
 647         scsi_max_devs = 0;
 648         for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
 649                 for (lun = 0; lun < CONFIG_SYS_SCSI_MAX_LUN; lun++) {
 650                         ret = scsi_detect_dev(i, lun,
 651                                               &scsi_dev_desc[scsi_max_devs]);
 652                         if (ret)
 653                                 continue;
 654                         part_init(&scsi_dev_desc[scsi_max_devs]);
 655
 656                         if (mode == 1) {
 657                                 printf("  Device %d: ", 0);
 658                                 dev_print(&scsi_dev_desc[scsi_max_devs]);
 659                         } /* if mode */
 660                         scsi_max_devs++;
 661                 } /* next LUN */
 662         }
 663         if (scsi_max_devs > 0)
 664                 scsi_curr_dev = 0;
 665         else
 666                 scsi_curr_dev = -1;
 667
 668         printf("Found %d device(s).\n", scsi_max_devs);
 669 #ifndef CONFIG_SPL_BUILD
 670         setenv_ulong("scsidevs", scsi_max_devs);
 671 #endif
 672         return 0;
 673 }
 674 #endif
 675
 676 #ifdef CONFIG_BLK
 677 static const struct blk_ops scsi_blk_ops = {
 678         .read   = scsi_read,
 679         .write  = scsi_write,
 680 };
 681
 682 U_BOOT_DRIVER(scsi_blk) = {
 683         .name           = "scsi_blk",
 684         .id             = UCLASS_BLK,
 685         .ops            = &scsi_blk_ops,
 686 };
 687 #else
 688 U_BOOT_LEGACY_BLK(scsi) = {
 689         .if_typename    = "scsi",
 690         .if_type        = IF_TYPE_SCSI,
 691         .max_devs       = CONFIG_SYS_SCSI_MAX_DEVICE,
 692         .desc           = scsi_dev_desc,
 693 };
 694 #endif