drivers/mmc/mmc.c

   1 /*
   2  * Copyright 2008, Freescale Semiconductor, Inc
   3  * Andy Fleming
   4  *
   5  * Based vaguely on the Linux code
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <config.h>
  27 #include <common.h>
  28 #include <command.h>
  29 #include <mmc.h>
  30 #include <part.h>
  31 #include <malloc.h>
  32 #include <linux/list.h>
  33 #include <div64.h>
  34
  35 /* Set block count limit because of 16 bit register limit on some hardware*/
  36 #ifndef CONFIG_SYS_MMC_MAX_BLK_COUNT
  37 #define CONFIG_SYS_MMC_MAX_BLK_COUNT 65535
  38 #endif
  39
  40 static struct list_head mmc_devices;
  41 static int cur_dev_num = -1;
  42
  43 int __board_mmc_getcd(struct mmc *mmc) {
  44         return -1;
  45 }
  46
  47 int board_mmc_getcd(struct mmc *mmc)__attribute__((weak,
  48         alias("__board_mmc_getcd")));
  49
  50 #ifdef CONFIG_MMC_BOUNCE_BUFFER
  51 static int mmc_bounce_need_bounce(struct mmc_data *orig)
  52 {
  53         ulong addr, len;
  54
  55         if (orig->flags & MMC_DATA_READ)
  56                 addr = (ulong)orig->dest;
  57         else
  58                 addr = (ulong)orig->src;
  59
  60         if (addr % ARCH_DMA_MINALIGN) {
  61                 debug("MMC: Unaligned data destination address %08lx!\n", addr);
  62                 return 1;
  63         }
  64
  65         len = (ulong)(orig->blocksize * orig->blocks);
  66         if (len % ARCH_DMA_MINALIGN) {
  67                 debug("MMC: Unaligned data destination length %08lx!\n", len);
  68                 return 1;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int mmc_bounce_buffer_start(struct mmc_data *backup,
  75                                         struct mmc_data *orig)
  76 {
  77         ulong origlen, len;
  78         void *buffer;
  79
  80         if (!orig)
  81                 return 0;
  82
  83         if (!mmc_bounce_need_bounce(orig))
  84                 return 0;
  85
  86         memcpy(backup, orig, sizeof(struct mmc_data));
  87
  88         origlen = orig->blocksize * orig->blocks;
  89         len = roundup(origlen, ARCH_DMA_MINALIGN);
  90         buffer = memalign(ARCH_DMA_MINALIGN, len);
  91         if (!buffer) {
  92                 puts("MMC: Error allocating MMC bounce buffer!\n");
  93                 return 1;
  94         }
  95
  96         if (orig->flags & MMC_DATA_READ) {
  97                 orig->dest = buffer;
  98         } else {
  99                 memcpy(buffer, orig->src, origlen);
 100                 orig->src = buffer;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static void mmc_bounce_buffer_stop(struct mmc_data *backup,
 107                                         struct mmc_data *orig)
 108 {
 109         ulong len;
 110
 111         if (!orig)
 112                 return;
 113
 114         if (!mmc_bounce_need_bounce(backup))
 115                 return;
 116
 117         if (backup->flags & MMC_DATA_READ) {
 118                 len = backup->blocksize * backup->blocks;
 119                 memcpy(backup->dest, orig->dest, len);
 120                 free(orig->dest);
 121                 orig->dest = backup->dest;
 122         } else {
 123                 free((void *)orig->src);
 124                 orig->src = backup->src;
 125         }
 126
 127         return;
 128
 129 }
 130 #else
 131 static inline int mmc_bounce_buffer_start(struct mmc_data *backup,
 132                                         struct mmc_data *orig) { return 0; }
 133 static inline void mmc_bounce_buffer_stop(struct mmc_data *backup,
 134                                         struct mmc_data *orig) { }
 135 #endif
 136
 137 int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 138 {
 139         struct mmc_data backup;
 140         int ret;
 141
 142         memset(&backup, 0, sizeof(backup));
 143
 144         ret = mmc_bounce_buffer_start(&backup, data);
 145         if (ret)
 146                 return ret;
 147
 148 #ifdef CONFIG_MMC_TRACE
 149         int i;
 150         u8 *ptr;
 151
 152         printf("CMD_SEND:%d\n", cmd->cmdidx);
 153         printf("\t\tARG\t\t\t 0x%08X\n", cmd->cmdarg);
 154         ret = mmc->send_cmd(mmc, cmd, data);
 155         switch (cmd->resp_type) {
 156                 case MMC_RSP_NONE:
 157                         printf("\t\tMMC_RSP_NONE\n");
 158                         break;
 159                 case MMC_RSP_R1:
 160                         printf("\t\tMMC_RSP_R1,5,6,7 \t 0x%08X \n",
 161                                 cmd->response[0]);
 162                         break;
 163                 case MMC_RSP_R1b:
 164                         printf("\t\tMMC_RSP_R1b\t\t 0x%08X \n",
 165                                 cmd->response[0]);
 166                         break;
 167                 case MMC_RSP_R2:
 168                         printf("\t\tMMC_RSP_R2\t\t 0x%08X \n",
 169                                 cmd->response[0]);
 170                         printf("\t\t          \t\t 0x%08X \n",
 171                                 cmd->response[1]);
 172                         printf("\t\t          \t\t 0x%08X \n",
 173                                 cmd->response[2]);
 174                         printf("\t\t          \t\t 0x%08X \n",
 175                                 cmd->response[3]);
 176                         printf("\n");
 177                         printf("\t\t\t\t\tDUMPING DATA\n");
 178                         for (i = 0; i < 4; i++) {
 179                                 int j;
 180                                 printf("\t\t\t\t\t%03d - ", i*4);
 181                                 ptr = (u8 *)&cmd->response[i];
 182                                 ptr += 3;
 183                                 for (j = 0; j < 4; j++)
 184                                         printf("%02X ", *ptr--);
 185                                 printf("\n");
 186                         }
 187                         break;
 188                 case MMC_RSP_R3:
 189                         printf("\t\tMMC_RSP_R3,4\t\t 0x%08X \n",
 190                                 cmd->response[0]);
 191                         break;
 192                 default:
 193                         printf("\t\tERROR MMC rsp not supported\n");
 194                         break;
 195         }
 196 #else
 197         ret = mmc->send_cmd(mmc, cmd, data);
 198 #endif
 199         mmc_bounce_buffer_stop(&backup, data);
 200         return ret;
 201 }
 202
 203 int mmc_send_status(struct mmc *mmc, int timeout)
 204 {
 205         struct mmc_cmd cmd;
 206         int err, retries = 5;
 207 #ifdef CONFIG_MMC_TRACE
 208         int status;
 209 #endif
 210
 211         cmd.cmdidx = MMC_CMD_SEND_STATUS;
 212         cmd.resp_type = MMC_RSP_R1;
 213         if (!mmc_host_is_spi(mmc))
 214                 cmd.cmdarg = mmc->rca << 16;
 215
 216         do {
 217                 err = mmc_send_cmd(mmc, &cmd, NULL);
 218                 if (!err) {
 219                         if ((cmd.response[0] & MMC_STATUS_RDY_FOR_DATA) &&
 220                             (cmd.response[0] & MMC_STATUS_CURR_STATE) !=
 221                              MMC_STATE_PRG)
 222                                 break;
 223                         else if (cmd.response[0] & MMC_STATUS_MASK) {
 224                                 printf("Status Error: 0x%08X\n",
 225                                         cmd.response[0]);
 226                                 return COMM_ERR;
 227                         }
 228                 } else if (--retries < 0)
 229                         return err;
 230
 231                 udelay(1000);
 232
 233         } while (timeout--);
 234
 235 #ifdef CONFIG_MMC_TRACE
 236         status = (cmd.response[0] & MMC_STATUS_CURR_STATE) >> 9;
 237         printf("CURR STATE:%d\n", status);
 238 #endif
 239         if (timeout <= 0) {
 240                 printf("Timeout waiting card ready\n");
 241                 return TIMEOUT;
 242         }
 243
 244         return 0;
 245 }
 246
 247 int mmc_set_blocklen(struct mmc *mmc, int len)
 248 {
 249         struct mmc_cmd cmd;
 250
 251         cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
 252         cmd.resp_type = MMC_RSP_R1;
 253         cmd.cmdarg = len;
 254
 255         return mmc_send_cmd(mmc, &cmd, NULL);
 256 }
 257
 258 struct mmc *find_mmc_device(int dev_num)
 259 {
 260         struct mmc *m;
 261         struct list_head *entry;
 262
 263         list_for_each(entry, &mmc_devices) {
 264                 m = list_entry(entry, struct mmc, link);
 265
 266                 if (m->block_dev.dev == dev_num)
 267                         return m;
 268         }
 269
 270         printf("MMC Device %d not found\n", dev_num);
 271
 272         return NULL;
 273 }
 274
 275 static ulong mmc_erase_t(struct mmc *mmc, ulong start, lbaint_t blkcnt)
 276 {
 277         struct mmc_cmd cmd;
 278         ulong end;
 279         int err, start_cmd, end_cmd;
 280
 281         if (mmc->high_capacity)
 282                 end = start + blkcnt - 1;
 283         else {
 284                 end = (start + blkcnt - 1) * mmc->write_bl_len;
 285                 start *= mmc->write_bl_len;
 286         }
 287
 288         if (IS_SD(mmc)) {
 289                 start_cmd = SD_CMD_ERASE_WR_BLK_START;
 290                 end_cmd = SD_CMD_ERASE_WR_BLK_END;
 291         } else {
 292                 start_cmd = MMC_CMD_ERASE_GROUP_START;
 293                 end_cmd = MMC_CMD_ERASE_GROUP_END;
 294         }
 295
 296         cmd.cmdidx = start_cmd;
 297         cmd.cmdarg = start;
 298         cmd.resp_type = MMC_RSP_R1;
 299
 300         err = mmc_send_cmd(mmc, &cmd, NULL);
 301         if (err)
 302                 goto err_out;
 303
 304         cmd.cmdidx = end_cmd;
 305         cmd.cmdarg = end;
 306
 307         err = mmc_send_cmd(mmc, &cmd, NULL);
 308         if (err)
 309                 goto err_out;
 310
 311         cmd.cmdidx = MMC_CMD_ERASE;
 312         cmd.cmdarg = SECURE_ERASE;
 313         cmd.resp_type = MMC_RSP_R1b;
 314
 315         err = mmc_send_cmd(mmc, &cmd, NULL);
 316         if (err)
 317                 goto err_out;
 318
 319         return 0;
 320
 321 err_out:
 322         puts("mmc erase failed\n");
 323         return err;
 324 }
 325
 326 static unsigned long
 327 mmc_berase(int dev_num, unsigned long start, lbaint_t blkcnt)
 328 {
 329         int err = 0;
 330         struct mmc *mmc = find_mmc_device(dev_num);
 331         lbaint_t blk = 0, blk_r = 0;
 332         int timeout = 1000;
 333
 334         if (!mmc)
 335                 return -1;
 336
 337         if ((start % mmc->erase_grp_size) || (blkcnt % mmc->erase_grp_size))
 338                 printf("\n\nCaution! Your devices Erase group is 0x%x\n"
 339                         "The erase range would be change to 0x%lx~0x%lx\n\n",
 340                        mmc->erase_grp_size, start & ~(mmc->erase_grp_size - 1),
 341                        ((start + blkcnt + mmc->erase_grp_size)
 342                        & ~(mmc->erase_grp_size - 1)) - 1);
 343
 344         while (blk < blkcnt) {
 345                 blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ?
 346                         mmc->erase_grp_size : (blkcnt - blk);
 347                 err = mmc_erase_t(mmc, start + blk, blk_r);
 348                 if (err)
 349                         break;
 350
 351                 blk += blk_r;
 352
 353                 /* Waiting for the ready status */
 354                 if (mmc_send_status(mmc, timeout))
 355                         return 0;
 356         }
 357
 358         return blk;
 359 }
 360
 361 static ulong
 362 mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
 363 {
 364         struct mmc_cmd cmd;
 365         struct mmc_data data;
 366         int timeout = 1000;
 367
 368         if ((start + blkcnt) > mmc->block_dev.lba) {
 369                 printf("MMC: block number 0x%lx exceeds max(0x%lx)\n",
 370                         start + blkcnt, mmc->block_dev.lba);
 371                 return 0;
 372         }
 373
 374         if (blkcnt > 1)
 375                 cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK;
 376         else
 377                 cmd.cmdidx = MMC_CMD_WRITE_SINGLE_BLOCK;
 378
 379         if (mmc->high_capacity)
 380                 cmd.cmdarg = start;
 381         else
 382                 cmd.cmdarg = start * mmc->write_bl_len;
 383
 384         cmd.resp_type = MMC_RSP_R1;
 385
 386         data.src = src;
 387         data.blocks = blkcnt;
 388         data.blocksize = mmc->write_bl_len;
 389         data.flags = MMC_DATA_WRITE;
 390
 391         if (mmc_send_cmd(mmc, &cmd, &data)) {
 392                 printf("mmc write failed\n");
 393                 return 0;
 394         }
 395
 396         /* SPI multiblock writes terminate using a special
 397          * token, not a STOP_TRANSMISSION request.
 398          */
 399         if (!mmc_host_is_spi(mmc) && blkcnt > 1) {
 400                 cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
 401                 cmd.cmdarg = 0;
 402                 cmd.resp_type = MMC_RSP_R1b;
 403                 if (mmc_send_cmd(mmc, &cmd, NULL)) {
 404                         printf("mmc fail to send stop cmd\n");
 405                         return 0;
 406                 }
 407         }
 408
 409         /* Waiting for the ready status */
 410         if (mmc_send_status(mmc, timeout))
 411                 return 0;
 412
 413         return blkcnt;
 414 }
 415
 416 static ulong
 417 mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
 418 {
 419         lbaint_t cur, blocks_todo = blkcnt;
 420
 421         struct mmc *mmc = find_mmc_device(dev_num);
 422         if (!mmc)
 423                 return 0;
 424
 425         if (mmc_set_blocklen(mmc, mmc->write_bl_len))
 426                 return 0;
 427
 428         do {
 429                 cur = (blocks_todo > mmc->b_max) ?  mmc->b_max : blocks_todo;
 430                 if(mmc_write_blocks(mmc, start, cur, src) != cur)
 431                         return 0;
 432                 blocks_todo -= cur;
 433                 start += cur;
 434                 src += cur * mmc->write_bl_len;
 435         } while (blocks_todo > 0);
 436
 437         return blkcnt;
 438 }
 439
 440 int mmc_read_blocks(struct mmc *mmc, void *dst, ulong start, lbaint_t blkcnt)
 441 {
 442         struct mmc_cmd cmd;
 443         struct mmc_data data;
 444
 445         if (blkcnt > 1)
 446                 cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK;
 447         else
 448                 cmd.cmdidx = MMC_CMD_READ_SINGLE_BLOCK;
 449
 450         if (mmc->high_capacity)
 451                 cmd.cmdarg = start;
 452         else
 453                 cmd.cmdarg = start * mmc->read_bl_len;
 454
 455         cmd.resp_type = MMC_RSP_R1;
 456
 457         data.dest = dst;
 458         data.blocks = blkcnt;
 459         data.blocksize = mmc->read_bl_len;
 460         data.flags = MMC_DATA_READ;
 461
 462         if (mmc_send_cmd(mmc, &cmd, &data))
 463                 return 0;
 464
 465         if (blkcnt > 1) {
 466                 cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
 467                 cmd.cmdarg = 0;
 468                 cmd.resp_type = MMC_RSP_R1b;
 469                 if (mmc_send_cmd(mmc, &cmd, NULL)) {
 470                         printf("mmc fail to send stop cmd\n");
 471                         return 0;
 472                 }
 473         }
 474
 475         return blkcnt;
 476 }
 477
 478 static ulong mmc_bread(int dev_num, ulong start, lbaint_t blkcnt, void *dst)
 479 {
 480         lbaint_t cur, blocks_todo = blkcnt;
 481
 482         if (blkcnt == 0)
 483                 return 0;
 484
 485         struct mmc *mmc = find_mmc_device(dev_num);
 486         if (!mmc)
 487                 return 0;
 488
 489         if ((start + blkcnt) > mmc->block_dev.lba) {
 490                 printf("MMC: block number 0x%lx exceeds max(0x%lx)\n",
 491                         start + blkcnt, mmc->block_dev.lba);
 492                 return 0;
 493         }
 494
 495         if (mmc_set_blocklen(mmc, mmc->read_bl_len))
 496                 return 0;
 497
 498         do {
 499                 cur = (blocks_todo > mmc->b_max) ?  mmc->b_max : blocks_todo;
 500                 if(mmc_read_blocks(mmc, dst, start, cur) != cur)
 501                         return 0;
 502                 blocks_todo -= cur;
 503                 start += cur;
 504                 dst += cur * mmc->read_bl_len;
 505         } while (blocks_todo > 0);
 506
 507         return blkcnt;
 508 }
 509
 510 int mmc_go_idle(struct mmc* mmc)
 511 {
 512         struct mmc_cmd cmd;
 513         int err;
 514
 515         udelay(1000);
 516
 517         cmd.cmdidx = MMC_CMD_GO_IDLE_STATE;
 518         cmd.cmdarg = 0;
 519         cmd.resp_type = MMC_RSP_NONE;
 520
 521         err = mmc_send_cmd(mmc, &cmd, NULL);
 522
 523         if (err)
 524                 return err;
 525
 526         udelay(2000);
 527
 528         return 0;
 529 }
 530
 531 int
 532 sd_send_op_cond(struct mmc *mmc)
 533 {
 534         int timeout = 1000;
 535         int err;
 536         struct mmc_cmd cmd;
 537
 538         do {
 539                 cmd.cmdidx = MMC_CMD_APP_CMD;
 540                 cmd.resp_type = MMC_RSP_R1;
 541                 cmd.cmdarg = 0;
 542
 543                 err = mmc_send_cmd(mmc, &cmd, NULL);
 544
 545                 if (err)
 546                         return err;
 547
 548                 cmd.cmdidx = SD_CMD_APP_SEND_OP_COND;
 549                 cmd.resp_type = MMC_RSP_R3;
 550
 551                 /*
 552                  * Most cards do not answer if some reserved bits
 553                  * in the ocr are set. However, Some controller
 554                  * can set bit 7 (reserved for low voltages), but
 555                  * how to manage low voltages SD card is not yet
 556                  * specified.
 557                  */
 558                 cmd.cmdarg = mmc_host_is_spi(mmc) ? 0 :
 559                         (mmc->voltages & 0xff8000);
 560
 561                 if (mmc->version == SD_VERSION_2)
 562                         cmd.cmdarg |= OCR_HCS;
 563
 564                 err = mmc_send_cmd(mmc, &cmd, NULL);
 565
 566                 if (err)
 567                         return err;
 568
 569                 udelay(1000);
 570         } while ((!(cmd.response[0] & OCR_BUSY)) && timeout--);
 571
 572         if (timeout <= 0)
 573                 return UNUSABLE_ERR;
 574
 575         if (mmc->version != SD_VERSION_2)
 576                 mmc->version = SD_VERSION_1_0;
 577
 578         if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
 579                 cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
 580                 cmd.resp_type = MMC_RSP_R3;
 581                 cmd.cmdarg = 0;
 582
 583                 err = mmc_send_cmd(mmc, &cmd, NULL);
 584
 585                 if (err)
 586                         return err;
 587         }
 588
 589         mmc->ocr = cmd.response[0];
 590
 591         mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
 592         mmc->rca = 0;
 593
 594         return 0;
 595 }
 596
 597 int mmc_send_op_cond(struct mmc *mmc)
 598 {
 599         int timeout = 10000;
 600         struct mmc_cmd cmd;
 601         int err;
 602
 603         /* Some cards seem to need this */
 604         mmc_go_idle(mmc);
 605
 606         /* Asking to the card its capabilities */
 607         cmd.cmdidx = MMC_CMD_SEND_OP_COND;
 608         cmd.resp_type = MMC_RSP_R3;
 609         cmd.cmdarg = 0;
 610
 611         err = mmc_send_cmd(mmc, &cmd, NULL);
 612
 613         if (err)
 614                 return err;
 615
 616         udelay(1000);
 617
 618         do {
 619                 cmd.cmdidx = MMC_CMD_SEND_OP_COND;
 620                 cmd.resp_type = MMC_RSP_R3;
 621                 cmd.cmdarg = (mmc_host_is_spi(mmc) ? 0 :
 622                                 (mmc->voltages &
 623                                 (cmd.response[0] & OCR_VOLTAGE_MASK)) |
 624                                 (cmd.response[0] & OCR_ACCESS_MODE));
 625
 626                 if (mmc->host_caps & MMC_MODE_HC)
 627                         cmd.cmdarg |= OCR_HCS;
 628
 629                 err = mmc_send_cmd(mmc, &cmd, NULL);
 630
 631                 if (err)
 632                         return err;
 633
 634                 udelay(1000);
 635         } while (!(cmd.response[0] & OCR_BUSY) && timeout--);
 636
 637         if (timeout <= 0)
 638                 return UNUSABLE_ERR;
 639
 640         if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
 641                 cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
 642                 cmd.resp_type = MMC_RSP_R3;
 643                 cmd.cmdarg = 0;
 644
 645                 err = mmc_send_cmd(mmc, &cmd, NULL);
 646
 647                 if (err)
 648                         return err;
 649         }
 650
 651         mmc->version = MMC_VERSION_UNKNOWN;
 652         mmc->ocr = cmd.response[0];
 653
 654         mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
 655         mmc->rca = 0;
 656
 657         return 0;
 658 }
 659
 660
 661 int mmc_send_ext_csd(struct mmc *mmc, u8 *ext_csd)
 662 {
 663         struct mmc_cmd cmd;
 664         struct mmc_data data;
 665         int err;
 666
 667         /* Get the Card Status Register */
 668         cmd.cmdidx = MMC_CMD_SEND_EXT_CSD;
 669         cmd.resp_type = MMC_RSP_R1;
 670         cmd.cmdarg = 0;
 671
 672         data.dest = (char *)ext_csd;
 673         data.blocks = 1;
 674         data.blocksize = 512;
 675         data.flags = MMC_DATA_READ;
 676
 677         err = mmc_send_cmd(mmc, &cmd, &data);
 678
 679         return err;
 680 }
 681
 682
 683 int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
 684 {
 685         struct mmc_cmd cmd;
 686         int timeout = 1000;
 687         int ret;
 688
 689         cmd.cmdidx = MMC_CMD_SWITCH;
 690         cmd.resp_type = MMC_RSP_R1b;
 691         cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 692                                  (index << 16) |
 693                                  (value << 8);
 694
 695         ret = mmc_send_cmd(mmc, &cmd, NULL);
 696
 697         /* Waiting for the ready status */
 698         if (!ret)
 699                 ret = mmc_send_status(mmc, timeout);
 700
 701         return ret;
 702
 703 }
 704
 705 int mmc_change_freq(struct mmc *mmc)
 706 {
 707         ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, 512);
 708         char cardtype;
 709         int err;
 710
 711         mmc->card_caps = 0;
 712
 713         if (mmc_host_is_spi(mmc))
 714                 return 0;
 715
 716         /* Only version 4 supports high-speed */
 717         if (mmc->version < MMC_VERSION_4)
 718                 return 0;
 719
 720         err = mmc_send_ext_csd(mmc, ext_csd);
 721
 722         if (err)
 723                 return err;
 724
 725         cardtype = ext_csd[EXT_CSD_CARD_TYPE] & 0xf;
 726
 727         err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, 1);
 728
 729         if (err)
 730                 return err;
 731
 732         /* Now check to see that it worked */
 733         err = mmc_send_ext_csd(mmc, ext_csd);
 734
 735         if (err)
 736                 return err;
 737
 738         /* No high-speed support */
 739         if (!ext_csd[EXT_CSD_HS_TIMING])
 740                 return 0;
 741
 742         /* High Speed is set, there are two types: 52MHz and 26MHz */
 743         if (cardtype & MMC_HS_52MHZ)
 744                 mmc->card_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 745         else
 746                 mmc->card_caps |= MMC_MODE_HS;
 747
 748         return 0;
 749 }
 750
 751 int mmc_switch_part(int dev_num, unsigned int part_num)
 752 {
 753         struct mmc *mmc = find_mmc_device(dev_num);
 754
 755         if (!mmc)
 756                 return -1;
 757
 758         return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONF,
 759                           (mmc->part_config & ~PART_ACCESS_MASK)
 760                           | (part_num & PART_ACCESS_MASK));
 761 }
 762
 763 int mmc_getcd(struct mmc *mmc)
 764 {
 765         int cd;
 766
 767         cd = board_mmc_getcd(mmc);
 768
 769         if ((cd < 0) && mmc->getcd)
 770                 cd = mmc->getcd(mmc);
 771
 772         return cd;
 773 }
 774
 775 int sd_switch(struct mmc *mmc, int mode, int group, u8 value, u8 *resp)
 776 {
 777         struct mmc_cmd cmd;
 778         struct mmc_data data;
 779
 780         /* Switch the frequency */
 781         cmd.cmdidx = SD_CMD_SWITCH_FUNC;
 782         cmd.resp_type = MMC_RSP_R1;
 783         cmd.cmdarg = (mode << 31) | 0xffffff;
 784         cmd.cmdarg &= ~(0xf << (group * 4));
 785         cmd.cmdarg |= value << (group * 4);
 786
 787         data.dest = (char *)resp;
 788         data.blocksize = 64;
 789         data.blocks = 1;
 790         data.flags = MMC_DATA_READ;
 791
 792         return mmc_send_cmd(mmc, &cmd, &data);
 793 }
 794
 795
 796 int sd_change_freq(struct mmc *mmc)
 797 {
 798         int err;
 799         struct mmc_cmd cmd;
 800         ALLOC_CACHE_ALIGN_BUFFER(uint, scr, 2);
 801         ALLOC_CACHE_ALIGN_BUFFER(uint, switch_status, 16);
 802         struct mmc_data data;
 803         int timeout;
 804
 805         mmc->card_caps = 0;
 806
 807         if (mmc_host_is_spi(mmc))
 808                 return 0;
 809
 810         /* Read the SCR to find out if this card supports higher speeds */
 811         cmd.cmdidx = MMC_CMD_APP_CMD;
 812         cmd.resp_type = MMC_RSP_R1;
 813         cmd.cmdarg = mmc->rca << 16;
 814
 815         err = mmc_send_cmd(mmc, &cmd, NULL);
 816
 817         if (err)
 818                 return err;
 819
 820         cmd.cmdidx = SD_CMD_APP_SEND_SCR;
 821         cmd.resp_type = MMC_RSP_R1;
 822         cmd.cmdarg = 0;
 823
 824         timeout = 3;
 825
 826 retry_scr:
 827         data.dest = (char *)scr;
 828         data.blocksize = 8;
 829         data.blocks = 1;
 830         data.flags = MMC_DATA_READ;
 831
 832         err = mmc_send_cmd(mmc, &cmd, &data);
 833
 834         if (err) {
 835                 if (timeout--)
 836                         goto retry_scr;
 837
 838                 return err;
 839         }
 840
 841         mmc->scr[0] = __be32_to_cpu(scr[0]);
 842         mmc->scr[1] = __be32_to_cpu(scr[1]);
 843
 844         switch ((mmc->scr[0] >> 24) & 0xf) {
 845                 case 0:
 846                         mmc->version = SD_VERSION_1_0;
 847                         break;
 848                 case 1:
 849                         mmc->version = SD_VERSION_1_10;
 850                         break;
 851                 case 2:
 852                         mmc->version = SD_VERSION_2;
 853                         break;
 854                 default:
 855                         mmc->version = SD_VERSION_1_0;
 856                         break;
 857         }
 858
 859         if (mmc->scr[0] & SD_DATA_4BIT)
 860                 mmc->card_caps |= MMC_MODE_4BIT;
 861
 862         /* Version 1.0 doesn't support switching */
 863         if (mmc->version == SD_VERSION_1_0)
 864                 return 0;
 865
 866         timeout = 4;
 867         while (timeout--) {
 868                 err = sd_switch(mmc, SD_SWITCH_CHECK, 0, 1,
 869                                 (u8 *)switch_status);
 870
 871                 if (err)
 872                         return err;
 873
 874                 /* The high-speed function is busy.  Try again */
 875                 if (!(__be32_to_cpu(switch_status[7]) & SD_HIGHSPEED_BUSY))
 876                         break;
 877         }
 878
 879         /* If high-speed isn't supported, we return */
 880         if (!(__be32_to_cpu(switch_status[3]) & SD_HIGHSPEED_SUPPORTED))
 881                 return 0;
 882
 883         /*
 884          * If the host doesn't support SD_HIGHSPEED, do not switch card to
 885          * HIGHSPEED mode even if the card support SD_HIGHSPPED.
 886          * This can avoid furthur problem when the card runs in different
 887          * mode between the host.
 888          */
 889         if (!((mmc->host_caps & MMC_MODE_HS_52MHz) &&
 890                 (mmc->host_caps & MMC_MODE_HS)))
 891                 return 0;
 892
 893         err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, 1, (u8 *)switch_status);
 894
 895         if (err)
 896                 return err;
 897
 898         if ((__be32_to_cpu(switch_status[4]) & 0x0f000000) == 0x01000000)
 899                 mmc->card_caps |= MMC_MODE_HS;
 900
 901         return 0;
 902 }
 903
 904 /* frequency bases */
 905 /* divided by 10 to be nice to platforms without floating point */
 906 static const int fbase[] = {
 907         10000,
 908         100000,
 909         1000000,
 910         10000000,
 911 };
 912
 913 /* Multiplier values for TRAN_SPEED.  Multiplied by 10 to be nice
 914  * to platforms without floating point.
 915  */
 916 static const int multipliers[] = {
 917         0,      /* reserved */
 918         10,
 919         12,
 920         13,
 921         15,
 922         20,
 923         25,
 924         30,
 925         35,
 926         40,
 927         45,
 928         50,
 929         55,
 930         60,
 931         70,
 932         80,
 933 };
 934
 935 void mmc_set_ios(struct mmc *mmc)
 936 {
 937         mmc->set_ios(mmc);
 938 }
 939
 940 void mmc_set_clock(struct mmc *mmc, uint clock)
 941 {
 942         if (clock > mmc->f_max)
 943                 clock = mmc->f_max;
 944
 945         if (clock < mmc->f_min)
 946                 clock = mmc->f_min;
 947
 948         mmc->clock = clock;
 949
 950         mmc_set_ios(mmc);
 951 }
 952
 953 void mmc_set_bus_width(struct mmc *mmc, uint width)
 954 {
 955         mmc->bus_width = width;
 956
 957         mmc_set_ios(mmc);
 958 }
 959
 960 int mmc_startup(struct mmc *mmc)
 961 {
 962         int err, width;
 963         uint mult, freq;
 964         u64 cmult, csize, capacity;
 965         struct mmc_cmd cmd;
 966         ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, 512);
 967         ALLOC_CACHE_ALIGN_BUFFER(u8, test_csd, 512);
 968         int timeout = 1000;
 969
 970 #ifdef CONFIG_MMC_SPI_CRC_ON
 971         if (mmc_host_is_spi(mmc)) { /* enable CRC check for spi */
 972                 cmd.cmdidx = MMC_CMD_SPI_CRC_ON_OFF;
 973                 cmd.resp_type = MMC_RSP_R1;
 974                 cmd.cmdarg = 1;
 975                 err = mmc_send_cmd(mmc, &cmd, NULL);
 976
 977                 if (err)
 978                         return err;
 979         }
 980 #endif
 981
 982         /* Put the Card in Identify Mode */
 983         cmd.cmdidx = mmc_host_is_spi(mmc) ? MMC_CMD_SEND_CID :
 984                 MMC_CMD_ALL_SEND_CID; /* cmd not supported in spi */
 985         cmd.resp_type = MMC_RSP_R2;
 986         cmd.cmdarg = 0;
 987
 988         err = mmc_send_cmd(mmc, &cmd, NULL);
 989
 990         if (err)
 991                 return err;
 992
 993         memcpy(mmc->cid, cmd.response, 16);
 994
 995         /*
 996          * For MMC cards, set the Relative Address.
 997          * For SD cards, get the Relatvie Address.
 998          * This also puts the cards into Standby State
 999          */
1000         if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
1001                 cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
1002                 cmd.cmdarg = mmc->rca << 16;
1003                 cmd.resp_type = MMC_RSP_R6;
1004
1005                 err = mmc_send_cmd(mmc, &cmd, NULL);
1006
1007                 if (err)
1008                         return err;
1009
1010                 if (IS_SD(mmc))
1011                         mmc->rca = (cmd.response[0] >> 16) & 0xffff;
1012         }
1013
1014         /* Get the Card-Specific Data */
1015         cmd.cmdidx = MMC_CMD_SEND_CSD;
1016         cmd.resp_type = MMC_RSP_R2;
1017         cmd.cmdarg = mmc->rca << 16;
1018
1019         err = mmc_send_cmd(mmc, &cmd, NULL);
1020
1021         /* Waiting for the ready status */
1022         mmc_send_status(mmc, timeout);
1023
1024         if (err)
1025                 return err;
1026
1027         mmc->csd[0] = cmd.response[0];
1028         mmc->csd[1] = cmd.response[1];
1029         mmc->csd[2] = cmd.response[2];
1030         mmc->csd[3] = cmd.response[3];
1031
1032         if (mmc->version == MMC_VERSION_UNKNOWN) {
1033                 int version = (cmd.response[0] >> 26) & 0xf;
1034
1035                 switch (version) {
1036                         case 0:
1037                                 mmc->version = MMC_VERSION_1_2;
1038                                 break;
1039                         case 1:
1040                                 mmc->version = MMC_VERSION_1_4;
1041                                 break;
1042                         case 2:
1043                                 mmc->version = MMC_VERSION_2_2;
1044                                 break;
1045                         case 3:
1046                                 mmc->version = MMC_VERSION_3;
1047                                 break;
1048                         case 4:
1049                                 mmc->version = MMC_VERSION_4;
1050                                 break;
1051                         default:
1052                                 mmc->version = MMC_VERSION_1_2;
1053                                 break;
1054                 }
1055         }
1056
1057         /* divide frequency by 10, since the mults are 10x bigger */
1058         freq = fbase[(cmd.response[0] & 0x7)];
1059         mult = multipliers[((cmd.response[0] >> 3) & 0xf)];
1060
1061         mmc->tran_speed = freq * mult;
1062
1063         mmc->read_bl_len = 1 << ((cmd.response[1] >> 16) & 0xf);
1064
1065         if (IS_SD(mmc))
1066                 mmc->write_bl_len = mmc->read_bl_len;
1067         else
1068                 mmc->write_bl_len = 1 << ((cmd.response[3] >> 22) & 0xf);
1069
1070         if (mmc->high_capacity) {
1071                 csize = (mmc->csd[1] & 0x3f) << 16
1072                         | (mmc->csd[2] & 0xffff0000) >> 16;
1073                 cmult = 8;
1074         } else {
1075                 csize = (mmc->csd[1] & 0x3ff) << 2
1076                         | (mmc->csd[2] & 0xc0000000) >> 30;
1077                 cmult = (mmc->csd[2] & 0x00038000) >> 15;
1078         }
1079
1080         mmc->capacity = (csize + 1) << (cmult + 2);
1081         mmc->capacity *= mmc->read_bl_len;
1082
1083         if (mmc->read_bl_len > 512)
1084                 mmc->read_bl_len = 512;
1085
1086         if (mmc->write_bl_len > 512)
1087                 mmc->write_bl_len = 512;
1088
1089         /* Select the card, and put it into Transfer Mode */
1090         if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
1091                 cmd.cmdidx = MMC_CMD_SELECT_CARD;
1092                 cmd.resp_type = MMC_RSP_R1;
1093                 cmd.cmdarg = mmc->rca << 16;
1094                 err = mmc_send_cmd(mmc, &cmd, NULL);
1095
1096                 if (err)
1097                         return err;
1098         }
1099
1100         /*
1101          * For SD, its erase group is always one sector
1102          */
1103         mmc->erase_grp_size = 1;
1104         mmc->part_config = MMCPART_NOAVAILABLE;
1105         if (!IS_SD(mmc) && (mmc->version >= MMC_VERSION_4)) {
1106                 /* check  ext_csd version and capacity */
1107                 err = mmc_send_ext_csd(mmc, ext_csd);
1108                 if (!err & (ext_csd[EXT_CSD_REV] >= 2)) {
1109                         /*
1110                          * According to the JEDEC Standard, the value of
1111                          * ext_csd's capacity is valid if the value is more
1112                          * than 2GB
1113                          */
1114                         capacity = ext_csd[EXT_CSD_SEC_CNT] << 0
1115                                         | ext_csd[EXT_CSD_SEC_CNT + 1] << 8
1116                                         | ext_csd[EXT_CSD_SEC_CNT + 2] << 16
1117                                         | ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
1118                         capacity *= 512;
1119                         if ((capacity >> 20) > 2 * 1024)
1120                                 mmc->capacity = capacity;
1121                 }
1122
1123                 /*
1124                  * Check whether GROUP_DEF is set, if yes, read out
1125                  * group size from ext_csd directly, or calculate
1126                  * the group size from the csd value.
1127                  */
1128                 if (ext_csd[EXT_CSD_ERASE_GROUP_DEF])
1129                         mmc->erase_grp_size =
1130                               ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * 512 * 1024;
1131                 else {
1132                         int erase_gsz, erase_gmul;
1133                         erase_gsz = (mmc->csd[2] & 0x00007c00) >> 10;
1134                         erase_gmul = (mmc->csd[2] & 0x000003e0) >> 5;
1135                         mmc->erase_grp_size = (erase_gsz + 1)
1136                                 * (erase_gmul + 1);
1137                 }
1138
1139                 /* store the partition info of emmc */
1140                 if ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) ||
1141                     ext_csd[EXT_CSD_BOOT_MULT])
1142                         mmc->part_config = ext_csd[EXT_CSD_PART_CONF];
1143         }
1144
1145         if (IS_SD(mmc))
1146                 err = sd_change_freq(mmc);
1147         else
1148                 err = mmc_change_freq(mmc);
1149
1150         if (err)
1151                 return err;
1152
1153         /* Restrict card's capabilities by what the host can do */
1154         mmc->card_caps &= mmc->host_caps;
1155
1156         if (IS_SD(mmc)) {
1157                 if (mmc->card_caps & MMC_MODE_4BIT) {
1158                         cmd.cmdidx = MMC_CMD_APP_CMD;
1159                         cmd.resp_type = MMC_RSP_R1;
1160                         cmd.cmdarg = mmc->rca << 16;
1161
1162                         err = mmc_send_cmd(mmc, &cmd, NULL);
1163                         if (err)
1164                                 return err;
1165
1166                         cmd.cmdidx = SD_CMD_APP_SET_BUS_WIDTH;
1167                         cmd.resp_type = MMC_RSP_R1;
1168                         cmd.cmdarg = 2;
1169                         err = mmc_send_cmd(mmc, &cmd, NULL);
1170                         if (err)
1171                                 return err;
1172
1173                         mmc_set_bus_width(mmc, 4);
1174                 }
1175
1176                 if (mmc->card_caps & MMC_MODE_HS)
1177                         mmc->tran_speed = 50000000;
1178                 else
1179                         mmc->tran_speed = 25000000;
1180         } else {
1181                 width = ((mmc->host_caps & MMC_MODE_MASK_WIDTH_BITS) >>
1182                          MMC_MODE_WIDTH_BITS_SHIFT);
1183                 for (; width >= 0; width--) {
1184                         /* Set the card to use 4 bit*/
1185                         err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
1186                                         EXT_CSD_BUS_WIDTH, width);
1187
1188                         if (err)
1189                                 continue;
1190
1191                         if (!width) {
1192                                 mmc_set_bus_width(mmc, 1);
1193                                 break;
1194                         } else
1195                                 mmc_set_bus_width(mmc, 4 * width);
1196
1197                         err = mmc_send_ext_csd(mmc, test_csd);
1198                         if (!err && ext_csd[EXT_CSD_PARTITIONING_SUPPORT] \
1199                                     == test_csd[EXT_CSD_PARTITIONING_SUPPORT]
1200                                  && ext_csd[EXT_CSD_ERASE_GROUP_DEF] \
1201                                     == test_csd[EXT_CSD_ERASE_GROUP_DEF] \
1202                                  && ext_csd[EXT_CSD_REV] \
1203                                     == test_csd[EXT_CSD_REV]
1204                                  && ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] \
1205                                     == test_csd[EXT_CSD_HC_ERASE_GRP_SIZE]
1206                                  && memcmp(&ext_csd[EXT_CSD_SEC_CNT], \
1207                                         &test_csd[EXT_CSD_SEC_CNT], 4) == 0) {
1208
1209                                 mmc->card_caps |= width;
1210                                 break;
1211                         }
1212                 }
1213
1214                 if (mmc->card_caps & MMC_MODE_HS) {
1215                         if (mmc->card_caps & MMC_MODE_HS_52MHz)
1216                                 mmc->tran_speed = 52000000;
1217                         else
1218                                 mmc->tran_speed = 26000000;
1219                 }
1220         }
1221
1222         mmc_set_clock(mmc, mmc->tran_speed);
1223
1224         /* fill in device description */
1225         mmc->block_dev.lun = 0;
1226         mmc->block_dev.type = 0;
1227         mmc->block_dev.blksz = mmc->read_bl_len;
1228         mmc->block_dev.lba = lldiv(mmc->capacity, mmc->read_bl_len);
1229         sprintf(mmc->block_dev.vendor, "Man %06x Snr %08x", mmc->cid[0] >> 8,
1230                         (mmc->cid[2] << 8) | (mmc->cid[3] >> 24));
1231         sprintf(mmc->block_dev.product, "%c%c%c%c%c", mmc->cid[0] & 0xff,
1232                         (mmc->cid[1] >> 24), (mmc->cid[1] >> 16) & 0xff,
1233                         (mmc->cid[1] >> 8) & 0xff, mmc->cid[1] & 0xff);
1234         sprintf(mmc->block_dev.revision, "%d.%d", mmc->cid[2] >> 28,
1235                         (mmc->cid[2] >> 24) & 0xf);
1236 #if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBDISK_SUPPORT)
1237         init_part(&mmc->block_dev);
1238 #endif
1239
1240         return 0;
1241 }
1242
1243 int mmc_send_if_cond(struct mmc *mmc)
1244 {
1245         struct mmc_cmd cmd;
1246         int err;
1247
1248         cmd.cmdidx = SD_CMD_SEND_IF_COND;
1249         /* We set the bit if the host supports voltages between 2.7 and 3.6 V */
1250         cmd.cmdarg = ((mmc->voltages & 0xff8000) != 0) << 8 | 0xaa;
1251         cmd.resp_type = MMC_RSP_R7;
1252
1253         err = mmc_send_cmd(mmc, &cmd, NULL);
1254
1255         if (err)
1256                 return err;
1257
1258         if ((cmd.response[0] & 0xff) != 0xaa)
1259                 return UNUSABLE_ERR;
1260         else
1261                 mmc->version = SD_VERSION_2;
1262
1263         return 0;
1264 }
1265
1266 int mmc_register(struct mmc *mmc)
1267 {
1268         /* Setup the universal parts of the block interface just once */
1269         mmc->block_dev.if_type = IF_TYPE_MMC;
1270         mmc->block_dev.dev = cur_dev_num++;
1271         mmc->block_dev.removable = 1;
1272         mmc->block_dev.block_read = mmc_bread;
1273         mmc->block_dev.block_write = mmc_bwrite;
1274         mmc->block_dev.block_erase = mmc_berase;
1275         if (!mmc->b_max)
1276                 mmc->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
1277
1278         INIT_LIST_HEAD (&mmc->link);
1279
1280         list_add_tail (&mmc->link, &mmc_devices);
1281
1282         return 0;
1283 }
1284
1285 #ifdef CONFIG_PARTITIONS
1286 block_dev_desc_t *mmc_get_dev(int dev)
1287 {
1288         struct mmc *mmc = find_mmc_device(dev);
1289         if (!mmc || mmc_init(mmc))
1290                 return NULL;
1291
1292         return &mmc->block_dev;
1293 }
1294 #endif
1295
1296 int mmc_init(struct mmc *mmc)
1297 {
1298         int err;
1299
1300         if (mmc_getcd(mmc) == 0) {
1301                 mmc->has_init = 0;
1302                 printf("MMC: no card present\n");
1303                 return NO_CARD_ERR;
1304         }
1305
1306         if (mmc->has_init)
1307                 return 0;
1308
1309         err = mmc->init(mmc);
1310
1311         if (err)
1312                 return err;
1313
1314         mmc_set_bus_width(mmc, 1);
1315         mmc_set_clock(mmc, 1);
1316
1317         /* Reset the Card */
1318         err = mmc_go_idle(mmc);
1319
1320         if (err)
1321                 return err;
1322
1323         /* The internal partition reset to user partition(0) at every CMD0*/
1324         mmc->part_num = 0;
1325
1326         /* Test for SD version 2 */
1327         err = mmc_send_if_cond(mmc);
1328
1329         /* Now try to get the SD card's operating condition */
1330         err = sd_send_op_cond(mmc);
1331
1332         /* If the command timed out, we check for an MMC card */
1333         if (err == TIMEOUT) {
1334                 err = mmc_send_op_cond(mmc);
1335
1336                 if (err) {
1337                         printf("Card did not respond to voltage select!\n");
1338                         return UNUSABLE_ERR;
1339                 }
1340         }
1341
1342         err = mmc_startup(mmc);
1343         if (err)
1344                 mmc->has_init = 0;
1345         else
1346                 mmc->has_init = 1;
1347         return err;
1348 }
1349
1350 /*
1351  * CPU and board-specific MMC initializations.  Aliased function
1352  * signals caller to move on
1353  */
1354 static int __def_mmc_init(bd_t *bis)
1355 {
1356         return -1;
1357 }
1358
1359 int cpu_mmc_init(bd_t *bis) __attribute__((weak, alias("__def_mmc_init")));
1360 int board_mmc_init(bd_t *bis) __attribute__((weak, alias("__def_mmc_init")));
1361
1362 void print_mmc_devices(char separator)
1363 {
1364         struct mmc *m;
1365         struct list_head *entry;
1366
1367         list_for_each(entry, &mmc_devices) {
1368                 m = list_entry(entry, struct mmc, link);
1369
1370                 printf("%s: %d", m->name, m->block_dev.dev);
1371
1372                 if (entry->next != &mmc_devices)
1373                         printf("%c ", separator);
1374         }
1375
1376         printf("\n");
1377 }
1378
1379 int get_mmc_num(void)
1380 {
1381         return cur_dev_num;
1382 }
1383
1384 int mmc_initialize(bd_t *bis)
1385 {
1386         INIT_LIST_HEAD (&mmc_devices);
1387         cur_dev_num = 0;
1388
1389         if (board_mmc_init(bis) < 0)
1390                 cpu_mmc_init(bis);
1391
1392         print_mmc_devices(',');
1393
1394         return 0;
1395 }