drivers/scsi/scsi.c

   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