git.sur5r.net Git - u-boot/blob - drivers/scsi/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_SATA_ULI5288
  21
  22 #   define SCSI_VEND_ID 0x10b9
  23 #   define SCSI_DEV_ID  0x5288
  24
  25 #  elif !defined(CONFIG_SCSI_AHCI_PLAT)
  26 #   error no scsi device defined
  27 #  endif
  28 # define SCSI_DEV_LIST {SCSI_VEND_ID, SCSI_DEV_ID}
  29 # endif
  30 #endif
  31
  32 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
  33 const struct pci_device_id scsi_device_list[] = { SCSI_DEV_LIST };
  34 #endif
  35 static struct scsi_cmd tempccb; /* temporary scsi command buffer */
  36
  37 static unsigned char tempbuff[512]; /* temporary data buffer */
  38
  39 #if !defined(CONFIG_DM_SCSI)
  40 static int scsi_max_devs; /* number of highest available scsi device */
  41
  42 static int scsi_curr_dev; /* current device */
  43
  44 static struct blk_desc scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE];
  45 #endif
  46
  47 /* almost the maximum amount of the scsi_ext command.. */
  48 #define SCSI_MAX_READ_BLK 0xFFFF
  49 #define SCSI_LBA48_READ 0xFFFFFFF
  50
  51 static void scsi_print_error(struct scsi_cmd *pccb)
  52 {
  53         /* Dummy function that could print an error for debugging */
  54 }
  55
  56 #ifdef CONFIG_SYS_64BIT_LBA
  57 void scsi_setup_read16(struct scsi_cmd *pccb, lbaint_t start,
  58                        unsigned long blocks)
  59 {
  60         pccb->cmd[0] = SCSI_READ16;
  61         pccb->cmd[1] = pccb->lun << 5;
  62         pccb->cmd[2] = (unsigned char)(start >> 56) & 0xff;
  63         pccb->cmd[3] = (unsigned char)(start >> 48) & 0xff;
  64         pccb->cmd[4] = (unsigned char)(start >> 40) & 0xff;
  65         pccb->cmd[5] = (unsigned char)(start >> 32) & 0xff;
  66         pccb->cmd[6] = (unsigned char)(start >> 24) & 0xff;
  67         pccb->cmd[7] = (unsigned char)(start >> 16) & 0xff;
  68         pccb->cmd[8] = (unsigned char)(start >> 8) & 0xff;
  69         pccb->cmd[9] = (unsigned char)start & 0xff;
  70         pccb->cmd[10] = 0;
  71         pccb->cmd[11] = (unsigned char)(blocks >> 24) & 0xff;
  72         pccb->cmd[12] = (unsigned char)(blocks >> 16) & 0xff;
  73         pccb->cmd[13] = (unsigned char)(blocks >> 8) & 0xff;
  74         pccb->cmd[14] = (unsigned char)blocks & 0xff;
  75         pccb->cmd[15] = 0;
  76         pccb->cmdlen = 16;
  77         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
  78         debug("scsi_setup_read16: cmd: %02X %02X startblk %02X%02X%02X%02X%02X%02X%02X%02X blccnt %02X%02X%02X%02X\n",
  79               pccb->cmd[0], pccb->cmd[1],
  80               pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
  81               pccb->cmd[6], pccb->cmd[7], pccb->cmd[8], pccb->cmd[9],
  82               pccb->cmd[11], pccb->cmd[12], pccb->cmd[13], pccb->cmd[14]);
  83 }
  84 #endif
  85
  86 static void scsi_setup_read_ext(struct scsi_cmd *pccb, lbaint_t start,
  87                                 unsigned short blocks)
  88 {
  89         pccb->cmd[0] = SCSI_READ10;
  90         pccb->cmd[1] = pccb->lun << 5;
  91         pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
  92         pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
  93         pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
  94         pccb->cmd[5] = (unsigned char)start & 0xff;
  95         pccb->cmd[6] = 0;
  96         pccb->cmd[7] = (unsigned char)(blocks >> 8) & 0xff;
  97         pccb->cmd[8] = (unsigned char)blocks & 0xff;
  98         pccb->cmd[6] = 0;
  99         pccb->cmdlen = 10;
 100         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 101         debug("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
 102               pccb->cmd[0], pccb->cmd[1],
 103               pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 104               pccb->cmd[7], pccb->cmd[8]);
 105 }
 106
 107 static void scsi_setup_write_ext(struct scsi_cmd *pccb, lbaint_t start,
 108                                  unsigned short blocks)
 109 {
 110         pccb->cmd[0] = SCSI_WRITE10;
 111         pccb->cmd[1] = pccb->lun << 5;
 112         pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
 113         pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
 114         pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
 115         pccb->cmd[5] = (unsigned char)start & 0xff;
 116         pccb->cmd[6] = 0;
 117         pccb->cmd[7] = ((unsigned char)(blocks >> 8)) & 0xff;
 118         pccb->cmd[8] = (unsigned char)blocks & 0xff;
 119         pccb->cmd[9] = 0;
 120         pccb->cmdlen = 10;
 121         pccb->msgout[0] = SCSI_IDENTIFY;  /* NOT USED */
 122         debug("%s: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
 123               __func__,
 124               pccb->cmd[0], pccb->cmd[1],
 125               pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 126               pccb->cmd[7], pccb->cmd[8]);
 127 }
 128
 129 static void scsi_setup_inquiry(struct scsi_cmd *pccb)
 130 {
 131         pccb->cmd[0] = SCSI_INQUIRY;
 132         pccb->cmd[1] = pccb->lun << 5;
 133         pccb->cmd[2] = 0;
 134         pccb->cmd[3] = 0;
 135         if (pccb->datalen > 255)
 136                 pccb->cmd[4] = 255;
 137         else
 138                 pccb->cmd[4] = (unsigned char)pccb->datalen;
 139         pccb->cmd[5] = 0;
 140         pccb->cmdlen = 6;
 141         pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 142 }
 143
 144 #ifdef CONFIG_BLK
 145 static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 146                        void *buffer)
 147 #else
 148 static ulong scsi_read(struct blk_desc *block_dev, lbaint_t blknr,
 149                        lbaint_t blkcnt, void *buffer)
 150 #endif
 151 {
 152 #ifdef CONFIG_BLK
 153         struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
 154         struct udevice *bdev = dev->parent;
 155 #else
 156         struct udevice *bdev = NULL;
 157 #endif
 158         lbaint_t start, blks;
 159         uintptr_t buf_addr;
 160         unsigned short smallblks = 0;
 161         struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;
 162
 163         /* Setup device */
 164         pccb->target = block_dev->target;
 165         pccb->lun = block_dev->lun;
 166         buf_addr = (unsigned long)buffer;
 167         start = blknr;
 168         blks = blkcnt;
 169         debug("\nscsi_read: dev %d startblk " LBAF
 170               ", blccnt " LBAF " buffer %lx\n",
 171               block_dev->devnum, start, blks, (unsigned long)buffer);
 172         do {
 173                 pccb->pdata = (unsigned char *)buf_addr;
 174 #ifdef CONFIG_SYS_64BIT_LBA
 175                 if (start > SCSI_LBA48_READ) {
 176                         unsigned long blocks;
 177                         blocks = min_t(lbaint_t, blks, SCSI_MAX_READ_BLK);
 178                         pccb->datalen = block_dev->blksz * blocks;
 179                         scsi_setup_read16(pccb, start, blocks);
 180                         start += blocks;
 181                         blks -= blocks;
 182                 } else
 183 #endif
 184                 if (blks > SCSI_MAX_READ_BLK) {
 185                         pccb->datalen = block_dev->blksz *
 186                                 SCSI_MAX_READ_BLK;
 187                         smallblks = SCSI_MAX_READ_BLK;
 188                         scsi_setup_read_ext(pccb, start, smallblks);
 189                         start += SCSI_MAX_READ_BLK;
 190                         blks -= SCSI_MAX_READ_BLK;
 191                 } else {
 192                         pccb->datalen = block_dev->blksz * blks;
 193                         smallblks = (unsigned short)blks;
 194                         scsi_setup_read_ext(pccb, start, smallblks);
 195                         start += blks;
 196                         blks = 0;
 197                 }
 198                 debug("scsi_read_ext: startblk " LBAF
 199                       ", blccnt %x buffer %" PRIXPTR "\n",
 200                       start, smallblks, buf_addr);
 201                 if (scsi_exec(bdev, pccb)) {
 202                         scsi_print_error(pccb);
 203                         blkcnt -= blks;
 204                         break;
 205                 }
 206                 buf_addr += pccb->datalen;
 207         } while (blks != 0);
 208         debug("scsi_read_ext: end startblk " LBAF
 209               ", blccnt %x buffer %" PRIXPTR "\n", start, smallblks, buf_addr);
 210         return blkcnt;
 211 }
 212
 213 /*******************************************************************************
 214  * scsi_write
 215  */
 216
 217 /* Almost the maximum amount of the scsi_ext command.. */
 218 #define SCSI_MAX_WRITE_BLK 0xFFFF
 219
 220 #ifdef CONFIG_BLK
 221 static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 222                         const void *buffer)
 223 #else
 224 static ulong scsi_write(struct blk_desc *block_dev, lbaint_t blknr,
 225                         lbaint_t blkcnt, const void *buffer)
 226 #endif
 227 {
 228 #ifdef CONFIG_BLK
 229         struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
 230         struct udevice *bdev = dev->parent;
 231 #else
 232         struct udevice *bdev = NULL;
 233 #endif
 234         lbaint_t start, blks;
 235         uintptr_t buf_addr;
 236         unsigned short smallblks;
 237         struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;
 238
 239         /* Setup device */
 240         pccb->target = block_dev->target;
 241         pccb->lun = block_dev->lun;
 242         buf_addr = (unsigned long)buffer;
 243         start = blknr;
 244         blks = blkcnt;
 245         debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
 246               __func__, block_dev->devnum, start, blks, (unsigned long)buffer);
 247         do {
 248                 pccb->pdata = (unsigned char *)buf_addr;
 249                 if (blks > SCSI_MAX_WRITE_BLK) {
 250                         pccb->datalen = (block_dev->blksz *
 251                                          SCSI_MAX_WRITE_BLK);
 252                         smallblks = SCSI_MAX_WRITE_BLK;
 253                         scsi_setup_write_ext(pccb, start, smallblks);
 254                         start += SCSI_MAX_WRITE_BLK;
 255                         blks -= SCSI_MAX_WRITE_BLK;
 256                 } else {
 257                         pccb->datalen = block_dev->blksz * blks;
 258                         smallblks = (unsigned short)blks;
 259                         scsi_setup_write_ext(pccb, start, smallblks);
 260                         start += blks;
 261                         blks = 0;
 262                 }
 263                 debug("%s: startblk " LBAF ", blccnt %x buffer %" PRIXPTR "\n",
 264                       __func__, start, smallblks, buf_addr);
 265                 if (scsi_exec(bdev, pccb)) {
 266                         scsi_print_error(pccb);
 267                         blkcnt -= blks;
 268                         break;
 269                 }
 270                 buf_addr += pccb->datalen;
 271         } while (blks != 0);
 272         debug("%s: end startblk " LBAF ", blccnt %x buffer %" PRIXPTR "\n",
 273               __func__, start, smallblks, buf_addr);
 274         return blkcnt;
 275 }
 276
 277 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
 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(1);
 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) != true)
 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) != true)
 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 #ifndef CONFIG_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) != true) {
 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) != true) {
 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, int mode)
 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.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         part_init(bdesc);
 596
 597         if (mode == 1) {
 598                 printf("  Device %d: ", 0);
 599                 dev_print(bdesc);
 600         }
 601         return 0;
 602 }
 603
 604 int scsi_scan(int mode)
 605 {
 606         unsigned char i, lun;
 607         struct uclass *uc;
 608         struct udevice *dev; /* SCSI controller */
 609         int ret;
 610
 611         if (mode == 1)
 612                 printf("scanning bus for devices...\n");
 613
 614         blk_unbind_all(IF_TYPE_SCSI);
 615
 616         ret = uclass_get(UCLASS_SCSI, &uc);
 617         if (ret)
 618                 return ret;
 619
 620         uclass_foreach_dev(dev, uc) {
 621                 struct scsi_platdata *plat; /* scsi controller platdata */
 622
 623                 /* probe SCSI controller driver */
 624                 ret = device_probe(dev);
 625                 if (ret)
 626                         return ret;
 627
 628                 /* Get controller platdata */
 629                 plat = dev_get_uclass_platdata(dev);
 630
 631                 for (i = 0; i < plat->max_id; i++)
 632                         for (lun = 0; lun < plat->max_lun; lun++)
 633                                 do_scsi_scan_one(dev, i, lun, mode);
 634         }
 635
 636         return 0;
 637 }
 638 #else
 639 int scsi_scan(int mode)
 640 {
 641         unsigned char i, lun;
 642         int ret;
 643
 644         if (mode == 1)
 645                 printf("scanning bus for devices...\n");
 646         for (i = 0; i < CONFIG_SYS_SCSI_MAX_DEVICE; i++)
 647                 scsi_init_dev_desc(&scsi_dev_desc[i], i);
 648
 649         scsi_max_devs = 0;
 650         for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
 651                 for (lun = 0; lun < CONFIG_SYS_SCSI_MAX_LUN; lun++) {
 652                         ret = scsi_detect_dev(NULL, i, lun,
 653                                               &scsi_dev_desc[scsi_max_devs]);
 654                         if (ret)
 655                                 continue;
 656                         part_init(&scsi_dev_desc[scsi_max_devs]);
 657
 658                         if (mode == 1) {
 659                                 printf("  Device %d: ", 0);
 660                                 dev_print(&scsi_dev_desc[scsi_max_devs]);
 661                         } /* if mode */
 662                         scsi_max_devs++;
 663                 } /* next LUN */
 664         }
 665         if (scsi_max_devs > 0)
 666                 scsi_curr_dev = 0;
 667         else
 668                 scsi_curr_dev = -1;
 669
 670         printf("Found %d device(s).\n", scsi_max_devs);
 671 #ifndef CONFIG_SPL_BUILD
 672         setenv_ulong("scsidevs", scsi_max_devs);
 673 #endif
 674         return 0;
 675 }
 676 #endif
 677
 678 #ifdef CONFIG_BLK
 679 static const struct blk_ops scsi_blk_ops = {
 680         .read   = scsi_read,
 681         .write  = scsi_write,
 682 };
 683
 684 U_BOOT_DRIVER(scsi_blk) = {
 685         .name           = "scsi_blk",
 686         .id             = UCLASS_BLK,
 687         .ops            = &scsi_blk_ops,
 688 };
 689 #else
 690 U_BOOT_LEGACY_BLK(scsi) = {
 691         .if_typename    = "scsi",
 692         .if_type        = IF_TYPE_SCSI,
 693         .max_devs       = CONFIG_SYS_SCSI_MAX_DEVICE,
 694         .desc           = scsi_dev_desc,
 695 };
 696 #endif