cpu/pxa/mmc.c

   1 /*
   2  * (C) Copyright 2003
   3  * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <config.h>
  25 #include <common.h>
  26 #include <mmc.h>
  27 #include <asm/errno.h>
  28 #include <asm/arch/hardware.h>
  29 #include <part.h>
  30
  31 #ifdef CONFIG_MMC
  32
  33 extern int fat_register_device(block_dev_desc_t * dev_desc, int part_no);
  34
  35 static block_dev_desc_t mmc_dev;
  36
  37 block_dev_desc_t *mmc_get_dev(int dev)
  38 {
  39         return ((block_dev_desc_t *) & mmc_dev);
  40 }
  41
  42 /*
  43  * FIXME needs to read cid and csd info to determine block size
  44  * and other parameters
  45  */
  46 static uchar mmc_buf[MMC_BLOCK_SIZE];
  47 static uchar spec_ver;
  48 static int mmc_ready = 0;
  49 static int wide = 0;
  50
  51 static uint32_t *
  52 /****************************************************/
  53 mmc_cmd(ushort cmd, ushort argh, ushort argl, ushort cmdat)
  54 /****************************************************/
  55 {
  56         static uint32_t resp[4], a, b, c;
  57         ulong status;
  58         int i;
  59
  60         debug("mmc_cmd %u 0x%04x 0x%04x 0x%04x\n", cmd, argh, argl,
  61               cmdat | wide);
  62         MMC_STRPCL = MMC_STRPCL_STOP_CLK;
  63         MMC_I_MASK = ~MMC_I_MASK_CLK_IS_OFF;
  64         while (!(MMC_I_REG & MMC_I_REG_CLK_IS_OFF)) ;
  65         MMC_CMD = cmd;
  66         MMC_ARGH = argh;
  67         MMC_ARGL = argl;
  68         MMC_CMDAT = cmdat | wide;
  69         MMC_I_MASK = ~MMC_I_MASK_END_CMD_RES;
  70         MMC_STRPCL = MMC_STRPCL_START_CLK;
  71         while (!(MMC_I_REG & MMC_I_REG_END_CMD_RES)) ;
  72
  73         status = MMC_STAT;
  74         debug("MMC status 0x%08x\n", status);
  75         if (status & MMC_STAT_TIME_OUT_RESPONSE) {
  76                 return 0;
  77         }
  78
  79         /* Linux says:
  80          * Did I mention this is Sick.  We always need to
  81          * discard the upper 8 bits of the first 16-bit word.
  82          */
  83         a = (MMC_RES & 0xffff);
  84         for (i = 0; i < 4; i++) {
  85                 b = (MMC_RES & 0xffff);
  86                 c = (MMC_RES & 0xffff);
  87                 resp[i] = (a << 24) | (b << 8) | (c >> 8);
  88                 a = c;
  89                 debug("MMC resp[%d] = %#08x\n", i, resp[i]);
  90         }
  91
  92         return resp;
  93 }
  94
  95 int
  96 /****************************************************/
  97 mmc_block_read(uchar * dst, ulong src, ulong len)
  98 /****************************************************/
  99 {
 100         ushort argh, argl;
 101         ulong status;
 102
 103         if (len == 0) {
 104                 return 0;
 105         }
 106
 107         debug("mmc_block_rd dst %lx src %lx len %d\n", (ulong) dst, src, len);
 108
 109         argh = len >> 16;
 110         argl = len & 0xffff;
 111
 112         /* set block len */
 113         mmc_cmd(MMC_CMD_SET_BLOCKLEN, argh, argl, MMC_CMDAT_R1);
 114
 115         /* send read command */
 116         argh = src >> 16;
 117         argl = src & 0xffff;
 118         MMC_STRPCL = MMC_STRPCL_STOP_CLK;
 119         MMC_RDTO = 0xffff;
 120         MMC_NOB = 1;
 121         MMC_BLKLEN = len;
 122         mmc_cmd(MMC_CMD_READ_SINGLE_BLOCK, argh, argl,
 123                 MMC_CMDAT_R1 | MMC_CMDAT_READ | MMC_CMDAT_BLOCK |
 124                 MMC_CMDAT_DATA_EN);
 125
 126         MMC_I_MASK = ~MMC_I_MASK_RXFIFO_RD_REQ;
 127         while (len) {
 128                 if (MMC_I_REG & MMC_I_REG_RXFIFO_RD_REQ) {
 129 #ifdef CONFIG_PXA27X
 130                         int i;
 131                         for (i = min(len, 32); i; i--) {
 132                                 *dst++ = *((volatile uchar *)&MMC_RXFIFO);
 133                                 len--;
 134                         }
 135 #else
 136                         *dst++ = MMC_RXFIFO;
 137                         len--;
 138 #endif
 139                 }
 140                 status = MMC_STAT;
 141                 if (status & MMC_STAT_ERRORS) {
 142                         printf("MMC_STAT error %lx\n", status);
 143                         return -1;
 144                 }
 145         }
 146         MMC_I_MASK = ~MMC_I_MASK_DATA_TRAN_DONE;
 147         while (!(MMC_I_REG & MMC_I_REG_DATA_TRAN_DONE)) ;
 148         status = MMC_STAT;
 149         if (status & MMC_STAT_ERRORS) {
 150                 printf("MMC_STAT error %lx\n", status);
 151                 return -1;
 152         }
 153         return 0;
 154 }
 155
 156 int
 157 /****************************************************/
 158 mmc_block_write(ulong dst, uchar * src, int len)
 159 /****************************************************/
 160 {
 161         ushort argh, argl;
 162         ulong status;
 163
 164         if (len == 0) {
 165                 return 0;
 166         }
 167
 168         debug("mmc_block_wr dst %lx src %lx len %d\n", dst, (ulong) src, len);
 169
 170         argh = len >> 16;
 171         argl = len & 0xffff;
 172
 173         /* set block len */
 174         mmc_cmd(MMC_CMD_SET_BLOCKLEN, argh, argl, MMC_CMDAT_R1);
 175
 176         /* send write command */
 177         argh = dst >> 16;
 178         argl = dst & 0xffff;
 179         MMC_STRPCL = MMC_STRPCL_STOP_CLK;
 180         MMC_NOB = 1;
 181         MMC_BLKLEN = len;
 182         mmc_cmd(MMC_CMD_WRITE_BLOCK, argh, argl,
 183                 MMC_CMDAT_R1 | MMC_CMDAT_WRITE | MMC_CMDAT_BLOCK |
 184                 MMC_CMDAT_DATA_EN);
 185
 186         MMC_I_MASK = ~MMC_I_MASK_TXFIFO_WR_REQ;
 187         while (len) {
 188                 if (MMC_I_REG & MMC_I_REG_TXFIFO_WR_REQ) {
 189                         int i, bytes = min(32, len);
 190
 191                         for (i = 0; i < bytes; i++) {
 192                                 MMC_TXFIFO = *src++;
 193                         }
 194                         if (bytes < 32) {
 195                                 MMC_PRTBUF = MMC_PRTBUF_BUF_PART_FULL;
 196                         }
 197                         len -= bytes;
 198                 }
 199                 status = MMC_STAT;
 200                 if (status & MMC_STAT_ERRORS) {
 201                         printf("MMC_STAT error %lx\n", status);
 202                         return -1;
 203                 }
 204         }
 205         MMC_I_MASK = ~MMC_I_MASK_DATA_TRAN_DONE;
 206         while (!(MMC_I_REG & MMC_I_REG_DATA_TRAN_DONE)) ;
 207         MMC_I_MASK = ~MMC_I_MASK_PRG_DONE;
 208         while (!(MMC_I_REG & MMC_I_REG_PRG_DONE)) ;
 209         status = MMC_STAT;
 210         if (status & MMC_STAT_ERRORS) {
 211                 printf("MMC_STAT error %lx\n", status);
 212                 return -1;
 213         }
 214         return 0;
 215 }
 216
 217 int
 218 /****************************************************/
 219 mmc_read(ulong src, uchar * dst, int size)
 220 /****************************************************/
 221 {
 222         ulong end, part_start, part_end, part_len, aligned_start, aligned_end;
 223         ulong mmc_block_size, mmc_block_address;
 224
 225         if (size == 0) {
 226                 return 0;
 227         }
 228
 229         if (!mmc_ready) {
 230                 printf("Please initial the MMC first\n");
 231                 return -1;
 232         }
 233
 234         mmc_block_size = MMC_BLOCK_SIZE;
 235         mmc_block_address = ~(mmc_block_size - 1);
 236
 237         src -= CONFIG_SYS_MMC_BASE;
 238         end = src + size;
 239         part_start = ~mmc_block_address & src;
 240         part_end = ~mmc_block_address & end;
 241         aligned_start = mmc_block_address & src;
 242         aligned_end = mmc_block_address & end;
 243
 244         /* all block aligned accesses */
 245         debug
 246             ("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 247              src, (ulong) dst, end, part_start, part_end, aligned_start,
 248              aligned_end);
 249         if (part_start) {
 250                 part_len = mmc_block_size - part_start;
 251                 debug
 252                     ("ps src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 253                      src, (ulong) dst, end, part_start, part_end, aligned_start,
 254                      aligned_end);
 255                 if ((mmc_block_read(mmc_buf, aligned_start, mmc_block_size)) <
 256                     0) {
 257                         return -1;
 258                 }
 259                 memcpy(dst, mmc_buf + part_start, part_len);
 260                 dst += part_len;
 261                 src += part_len;
 262         }
 263         debug
 264             ("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 265              src, (ulong) dst, end, part_start, part_end, aligned_start,
 266              aligned_end);
 267         for (; src < aligned_end; src += mmc_block_size, dst += mmc_block_size) {
 268                 debug
 269                     ("al src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 270                      src, (ulong) dst, end, part_start, part_end, aligned_start,
 271                      aligned_end);
 272                 if ((mmc_block_read((uchar *) (dst), src, mmc_block_size)) < 0) {
 273                         return -1;
 274                 }
 275         }
 276         debug
 277             ("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 278              src, (ulong) dst, end, part_start, part_end, aligned_start,
 279              aligned_end);
 280         if (part_end && src < end) {
 281                 debug
 282                     ("pe src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 283                      src, (ulong) dst, end, part_start, part_end, aligned_start,
 284                      aligned_end);
 285                 if ((mmc_block_read(mmc_buf, aligned_end, mmc_block_size)) < 0) {
 286                         return -1;
 287                 }
 288                 memcpy(dst, mmc_buf, part_end);
 289         }
 290         return 0;
 291 }
 292
 293 int
 294 /****************************************************/
 295 mmc_write(uchar * src, ulong dst, int size)
 296 /****************************************************/
 297 {
 298         ulong end, part_start, part_end, part_len, aligned_start, aligned_end;
 299         ulong mmc_block_size, mmc_block_address;
 300
 301         if (size == 0) {
 302                 return 0;
 303         }
 304
 305         if (!mmc_ready) {
 306                 printf("Please initial the MMC first\n");
 307                 return -1;
 308         }
 309
 310         mmc_block_size = MMC_BLOCK_SIZE;
 311         mmc_block_address = ~(mmc_block_size - 1);
 312
 313         dst -= CONFIG_SYS_MMC_BASE;
 314         end = dst + size;
 315         part_start = ~mmc_block_address & dst;
 316         part_end = ~mmc_block_address & end;
 317         aligned_start = mmc_block_address & dst;
 318         aligned_end = mmc_block_address & end;
 319
 320         /* all block aligned accesses */
 321         debug
 322             ("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 323              src, (ulong) dst, end, part_start, part_end, aligned_start,
 324              aligned_end);
 325         if (part_start) {
 326                 part_len = mmc_block_size - part_start;
 327                 debug
 328                     ("ps src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 329                      (ulong) src, dst, end, part_start, part_end, aligned_start,
 330                      aligned_end);
 331                 if ((mmc_block_read(mmc_buf, aligned_start, mmc_block_size)) <
 332                     0) {
 333                         return -1;
 334                 }
 335                 memcpy(mmc_buf + part_start, src, part_len);
 336                 if ((mmc_block_write(aligned_start, mmc_buf, mmc_block_size)) <
 337                     0) {
 338                         return -1;
 339                 }
 340                 dst += part_len;
 341                 src += part_len;
 342         }
 343         debug
 344             ("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 345              src, (ulong) dst, end, part_start, part_end, aligned_start,
 346              aligned_end);
 347         for (; dst < aligned_end; src += mmc_block_size, dst += mmc_block_size) {
 348                 debug
 349                     ("al src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 350                      src, (ulong) dst, end, part_start, part_end, aligned_start,
 351                      aligned_end);
 352                 if ((mmc_block_write(dst, (uchar *) src, mmc_block_size)) < 0) {
 353                         return -1;
 354                 }
 355         }
 356         debug
 357             ("src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 358              src, (ulong) dst, end, part_start, part_end, aligned_start,
 359              aligned_end);
 360         if (part_end && dst < end) {
 361                 debug
 362                     ("pe src %lx dst %lx end %lx pstart %lx pend %lx astart %lx aend %lx\n",
 363                      src, (ulong) dst, end, part_start, part_end, aligned_start,
 364                      aligned_end);
 365                 if ((mmc_block_read(mmc_buf, aligned_end, mmc_block_size)) < 0) {
 366                         return -1;
 367                 }
 368                 memcpy(mmc_buf, src, part_end);
 369                 if ((mmc_block_write(aligned_end, mmc_buf, mmc_block_size)) < 0) {
 370                         return -1;
 371                 }
 372         }
 373         return 0;
 374 }
 375
 376 ulong
 377 /****************************************************/
 378 mmc_bread(int dev_num, ulong blknr, lbaint_t blkcnt, void *dst)
 379 /****************************************************/
 380 {
 381         int mmc_block_size = MMC_BLOCK_SIZE;
 382         ulong src = blknr * mmc_block_size + CONFIG_SYS_MMC_BASE;
 383
 384         mmc_read(src, (uchar *) dst, blkcnt * mmc_block_size);
 385         return blkcnt;
 386 }
 387
 388 #ifdef __GNUC__
 389 #define likely(x)       __builtin_expect(!!(x), 1)
 390 #define unlikely(x)     __builtin_expect(!!(x), 0)
 391 #else
 392 #define likely(x)       (x)
 393 #define unlikely(x)     (x)
 394 #endif
 395
 396 #define UNSTUFF_BITS(resp,start,size)                                   \
 397         ({                                                              \
 398                 const int __size = size;                                \
 399                 const uint32_t __mask = (__size < 32 ? 1 << __size : 0) - 1;    \
 400                 const int32_t __off = 3 - ((start) / 32);                       \
 401                 const int32_t __shft = (start) & 31;                    \
 402                 uint32_t __res;                                         \
 403                                                                         \
 404                 __res = resp[__off] >> __shft;                          \
 405                 if (__size + __shft > 32)                               \
 406                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
 407                 __res & __mask;                                         \
 408         })
 409
 410 /*
 411  * Given the decoded CSD structure, decode the raw CID to our CID structure.
 412  */
 413 static void mmc_decode_cid(uint32_t * resp)
 414 {
 415         if (IF_TYPE_SD == mmc_dev.if_type) {
 416                 /*
 417                  * SD doesn't currently have a version field so we will
 418                  * have to assume we can parse this.
 419                  */
 420                 sprintf((char *)mmc_dev.vendor,
 421                         "Man %02x OEM %c%c \"%c%c%c%c%c\" Date %02u/%04u",
 422                         UNSTUFF_BITS(resp, 120, 8), UNSTUFF_BITS(resp, 112, 8),
 423                         UNSTUFF_BITS(resp, 104, 8), UNSTUFF_BITS(resp, 96, 8),
 424                         UNSTUFF_BITS(resp, 88, 8), UNSTUFF_BITS(resp, 80, 8),
 425                         UNSTUFF_BITS(resp, 72, 8), UNSTUFF_BITS(resp, 64, 8),
 426                         UNSTUFF_BITS(resp, 8, 4), UNSTUFF_BITS(resp, 12,
 427                                                                8) + 2000);
 428                 sprintf((char *)mmc_dev.revision, "%d.%d",
 429                         UNSTUFF_BITS(resp, 60, 4), UNSTUFF_BITS(resp, 56, 4));
 430                 sprintf((char *)mmc_dev.product, "%u",
 431                         UNSTUFF_BITS(resp, 24, 32));
 432         } else {
 433                 /*
 434                  * The selection of the format here is based upon published
 435                  * specs from sandisk and from what people have reported.
 436                  */
 437                 switch (spec_ver) {
 438                 case 0: /* MMC v1.0 - v1.2 */
 439                 case 1: /* MMC v1.4 */
 440                         sprintf((char *)mmc_dev.vendor,
 441                                 "Man %02x%02x%02x \"%c%c%c%c%c%c%c\" Date %02u/%04u",
 442                                 UNSTUFF_BITS(resp, 120, 8), UNSTUFF_BITS(resp,
 443                                                                          112,
 444                                                                          8),
 445                                 UNSTUFF_BITS(resp, 104, 8), UNSTUFF_BITS(resp,
 446                                                                          96, 8),
 447                                 UNSTUFF_BITS(resp, 88, 8), UNSTUFF_BITS(resp,
 448                                                                         80, 8),
 449                                 UNSTUFF_BITS(resp, 72, 8), UNSTUFF_BITS(resp,
 450                                                                         64, 8),
 451                                 UNSTUFF_BITS(resp, 56, 8), UNSTUFF_BITS(resp,
 452                                                                         48, 8),
 453                                 UNSTUFF_BITS(resp, 12, 4), UNSTUFF_BITS(resp, 8,
 454                                                                         4) +
 455                                 1997);
 456                         sprintf((char *)mmc_dev.revision, "%d.%d",
 457                                 UNSTUFF_BITS(resp, 44, 4), UNSTUFF_BITS(resp,
 458                                                                         40, 4));
 459                         sprintf((char *)mmc_dev.product, "%u",
 460                                 UNSTUFF_BITS(resp, 16, 24));
 461                         break;
 462
 463                 case 2: /* MMC v2.0 - v2.2 */
 464                 case 3: /* MMC v3.1 - v3.3 */
 465                 case 4: /* MMC v4 */
 466                         sprintf((char *)mmc_dev.vendor,
 467                                 "Man %02x OEM %04x \"%c%c%c%c%c%c\" Date %02u/%04u",
 468                                 UNSTUFF_BITS(resp, 120, 8), UNSTUFF_BITS(resp,
 469                                                                          104,
 470                                                                          16),
 471                                 UNSTUFF_BITS(resp, 96, 8), UNSTUFF_BITS(resp,
 472                                                                         88, 8),
 473                                 UNSTUFF_BITS(resp, 80, 8), UNSTUFF_BITS(resp,
 474                                                                         72, 8),
 475                                 UNSTUFF_BITS(resp, 64, 8), UNSTUFF_BITS(resp,
 476                                                                         56, 8),
 477                                 UNSTUFF_BITS(resp, 12, 4), UNSTUFF_BITS(resp, 8,
 478                                                                         4) +
 479                                 1997);
 480                         sprintf((char *)mmc_dev.product, "%u",
 481                                 UNSTUFF_BITS(resp, 16, 32));
 482                         sprintf((char *)mmc_dev.revision, "N/A");
 483                         break;
 484
 485                 default:
 486                         printf("MMC card has unknown MMCA version %d\n",
 487                                spec_ver);
 488                         break;
 489                 }
 490         }
 491         printf("%s card.\nVendor: %s\nProduct: %s\nRevision: %s\n",
 492                (IF_TYPE_SD == mmc_dev.if_type) ? "SD" : "MMC", mmc_dev.vendor,
 493                mmc_dev.product, mmc_dev.revision);
 494 }
 495
 496 /*
 497  * Given a 128-bit response, decode to our card CSD structure.
 498  */
 499 static void mmc_decode_csd(uint32_t * resp)
 500 {
 501         unsigned int mult, csd_struct;
 502
 503         if (IF_TYPE_SD == mmc_dev.if_type) {
 504                 csd_struct = UNSTUFF_BITS(resp, 126, 2);
 505                 if (csd_struct != 0) {
 506                         printf("SD: unrecognised CSD structure version %d\n",
 507                                csd_struct);
 508                         return;
 509                 }
 510         } else {
 511                 /*
 512                  * We only understand CSD structure v1.1 and v1.2.
 513                  * v1.2 has extra information in bits 15, 11 and 10.
 514                  */
 515                 csd_struct = UNSTUFF_BITS(resp, 126, 2);
 516                 if (csd_struct != 1 && csd_struct != 2) {
 517                         printf("MMC: unrecognised CSD structure version %d\n",
 518                                csd_struct);
 519                         return;
 520                 }
 521
 522                 spec_ver = UNSTUFF_BITS(resp, 122, 4);
 523                 mmc_dev.if_type = IF_TYPE_MMC;
 524         }
 525
 526         mult = 1 << (UNSTUFF_BITS(resp, 47, 3) + 2);
 527         mmc_dev.lba = (1 + UNSTUFF_BITS(resp, 62, 12)) * mult;
 528         mmc_dev.blksz = 1 << UNSTUFF_BITS(resp, 80, 4);
 529
 530         /* FIXME: The following just makes assumes that's the partition type -- should really read it */
 531         mmc_dev.part_type = PART_TYPE_DOS;
 532         mmc_dev.dev = 0;
 533         mmc_dev.lun = 0;
 534         mmc_dev.type = DEV_TYPE_HARDDISK;
 535         mmc_dev.removable = 0;
 536         mmc_dev.block_read = mmc_bread;
 537
 538         printf("Detected: %lu blocks of %lu bytes (%luMB) ",
 539                 mmc_dev.lba,
 540                 mmc_dev.blksz,
 541                 mmc_dev.lba * mmc_dev.blksz / (1024 * 1024));
 542 }
 543
 544 int
 545 /****************************************************/
 546 mmc_init(int verbose)
 547 /****************************************************/
 548 {
 549         int retries, rc = -ENODEV;
 550         uint32_t cid_resp[4];
 551         uint32_t *resp;
 552         uint16_t rca = 0;
 553
 554         /* Reset device interface type */
 555         mmc_dev.if_type = IF_TYPE_UNKNOWN;
 556
 557 #if defined (CONFIG_LUBBOCK) || (defined (CONFIG_GUMSTIX) && !defined(CONFIG_PXA27X))
 558         set_GPIO_mode(GPIO6_MMCCLK_MD);
 559         set_GPIO_mode(GPIO8_MMCCS0_MD);
 560 #endif
 561         CKEN |= CKEN12_MMC;     /* enable MMC unit clock */
 562
 563         MMC_CLKRT = MMC_CLKRT_0_3125MHZ;
 564         MMC_RESTO = MMC_RES_TO_MAX;
 565         MMC_SPI = MMC_SPI_DISABLE;
 566
 567         /* reset */
 568         mmc_cmd(MMC_CMD_GO_IDLE_STATE, 0, 0, MMC_CMDAT_INIT | MMC_CMDAT_R0);
 569         udelay(200000);
 570         retries = 3;
 571         while (retries--) {
 572                 resp = mmc_cmd(MMC_CMD_APP_CMD, 0, 0, MMC_CMDAT_R1);
 573                 if (!(resp[0] & 0x00000020)) {  /* Card does not support APP_CMD */
 574                         debug("Card does not support APP_CMD\n");
 575                         break;
 576                 }
 577
 578                 /* Select 3.2-3.3V and 3.3-3.4V */
 579                 resp = mmc_cmd(SD_CMD_APP_SEND_OP_COND, 0x0030, 0x0000,
 580                                 MMC_CMDAT_R3 | (retries < 2 ? 0
 581                                         : MMC_CMDAT_INIT));
 582                 if (resp[0] & 0x80000000) {
 583                         mmc_dev.if_type = IF_TYPE_SD;
 584                         debug("Detected SD card\n");
 585                         break;
 586                 }
 587 #ifdef CONFIG_PXA27X
 588                 udelay(10000);
 589 #else
 590                 udelay(200000);
 591 #endif
 592         }
 593
 594         if (retries <= 0 || !(IF_TYPE_SD == mmc_dev.if_type)) {
 595                 debug("Failed to detect SD Card, trying MMC\n");
 596                 resp =
 597                     mmc_cmd(MMC_CMD_SEND_OP_COND, 0x00ff, 0x8000, MMC_CMDAT_R3);
 598
 599                 retries = 10;
 600                 while (retries-- && resp && !(resp[0] & 0x80000000)) {
 601 #ifdef CONFIG_PXA27X
 602                         udelay(10000);
 603 #else
 604                         udelay(200000);
 605 #endif
 606                         resp =
 607                             mmc_cmd(MMC_CMD_SEND_OP_COND, 0x00ff, 0x8000,
 608                                     MMC_CMDAT_R3);
 609                 }
 610         }
 611
 612         /* try to get card id */
 613         resp =
 614             mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, 0, MMC_CMDAT_R2 | MMC_CMDAT_BUSY);
 615         if (resp) {
 616                 memcpy(cid_resp, resp, sizeof(cid_resp));
 617
 618                 /* MMC exists, get CSD too */
 619                 resp = mmc_cmd(MMC_CMD_SET_RELATIVE_ADDR, 0, 0, MMC_CMDAT_R1);
 620                 if (IF_TYPE_SD == mmc_dev.if_type)
 621                         rca = ((resp[0] & 0xffff0000) >> 16);
 622                 resp = mmc_cmd(MMC_CMD_SEND_CSD, rca, 0, MMC_CMDAT_R2);
 623                 if (resp) {
 624                         mmc_decode_csd(resp);
 625                         rc = 0;
 626                         mmc_ready = 1;
 627                 }
 628
 629                 mmc_decode_cid(cid_resp);
 630         }
 631
 632         MMC_CLKRT = 0;          /* 20 MHz */
 633         resp = mmc_cmd(MMC_CMD_SELECT_CARD, rca, 0, MMC_CMDAT_R1);
 634
 635 #ifdef CONFIG_PXA27X
 636         if (IF_TYPE_SD == mmc_dev.if_type) {
 637                 resp = mmc_cmd(MMC_CMD_APP_CMD, rca, 0, MMC_CMDAT_R1);
 638                 resp = mmc_cmd(SD_CMD_APP_SET_BUS_WIDTH, 0, 2, MMC_CMDAT_R1);
 639                 wide = MMC_CMDAT_SD_4DAT;
 640         }
 641 #endif
 642
 643         fat_register_device(&mmc_dev, 1);       /* partitions start counting with 1 */
 644
 645         return rc;
 646 }
 647
 648 int mmc_ident(block_dev_desc_t * dev)
 649 {
 650         return 0;
 651 }
 652
 653 int mmc2info(ulong addr)
 654 {
 655         if (addr >= CONFIG_SYS_MMC_BASE
 656             && addr < CONFIG_SYS_MMC_BASE + (mmc_dev.lba * mmc_dev.blksz)) {
 657                 return 1;
 658         }
 659         return 0;
 660 }
 661
 662 #endif /* CONFIG_MMC */