drivers/mmc/omap3_mmc.c

   1 /*
   2  * (C) Copyright 2008
   3  * Texas Instruments, <www.ti.com>
   4  * Syed Mohammed Khasim <khasim@ti.com>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation's version 2 of
  12  * the License.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <config.h>
  26 #include <common.h>
  27 #include <fat.h>
  28 #include <mmc.h>
  29 #include <part.h>
  30 #include <i2c.h>
  31 #include <twl4030.h>
  32 #include <asm/io.h>
  33 #include <asm/arch/mmc.h>
  34
  35 const unsigned short mmc_transspeed_val[15][4] = {
  36         {CLKD(10, 1), CLKD(10, 10), CLKD(10, 100), CLKD(10, 1000)},
  37         {CLKD(12, 1), CLKD(12, 10), CLKD(12, 100), CLKD(12, 1000)},
  38         {CLKD(13, 1), CLKD(13, 10), CLKD(13, 100), CLKD(13, 1000)},
  39         {CLKD(15, 1), CLKD(15, 10), CLKD(15, 100), CLKD(15, 1000)},
  40         {CLKD(20, 1), CLKD(20, 10), CLKD(20, 100), CLKD(20, 1000)},
  41         {CLKD(26, 1), CLKD(26, 10), CLKD(26, 100), CLKD(26, 1000)},
  42         {CLKD(30, 1), CLKD(30, 10), CLKD(30, 100), CLKD(30, 1000)},
  43         {CLKD(35, 1), CLKD(35, 10), CLKD(35, 100), CLKD(35, 1000)},
  44         {CLKD(40, 1), CLKD(40, 10), CLKD(40, 100), CLKD(40, 1000)},
  45         {CLKD(45, 1), CLKD(45, 10), CLKD(45, 100), CLKD(45, 1000)},
  46         {CLKD(52, 1), CLKD(52, 10), CLKD(52, 100), CLKD(52, 1000)},
  47         {CLKD(55, 1), CLKD(55, 10), CLKD(55, 100), CLKD(55, 1000)},
  48         {CLKD(60, 1), CLKD(60, 10), CLKD(60, 100), CLKD(60, 1000)},
  49         {CLKD(70, 1), CLKD(70, 10), CLKD(70, 100), CLKD(70, 1000)},
  50         {CLKD(80, 1), CLKD(80, 10), CLKD(80, 100), CLKD(80, 1000)}
  51 };
  52
  53 mmc_card_data cur_card_data;
  54 static block_dev_desc_t mmc_blk_dev;
  55 static hsmmc_t *mmc_base = (hsmmc_t *)OMAP_HSMMC1_BASE;
  56
  57 unsigned char mmc_set_dev(int dev)
  58 {
  59         switch (dev) {
  60         case 1:
  61                 mmc_base = (hsmmc_t *)OMAP_HSMMC1_BASE;
  62                 break;
  63         case 2:
  64                 mmc_base = (hsmmc_t *)OMAP_HSMMC2_BASE;
  65                 break;
  66         case 3:
  67                 mmc_base = (hsmmc_t *)OMAP_HSMMC3_BASE;
  68                 break;
  69         default:
  70                 mmc_base = (hsmmc_t *)OMAP_HSMMC1_BASE;
  71                 return 1;
  72         }
  73
  74         return 0;
  75 }
  76
  77 block_dev_desc_t *mmc_get_dev(int dev)
  78 {
  79         return (block_dev_desc_t *) &mmc_blk_dev;
  80 }
  81
  82 unsigned char mmc_board_init(void)
  83 {
  84         t2_t *t2_base = (t2_t *)T2_BASE;
  85         struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
  86
  87 #if defined(CONFIG_TWL4030_POWER)
  88         twl4030_power_mmc_init();
  89 #endif
  90
  91         writel(readl(&t2_base->pbias_lite) | PBIASLITEPWRDNZ1 |
  92                 PBIASSPEEDCTRL0 | PBIASLITEPWRDNZ0,
  93                 &t2_base->pbias_lite);
  94
  95         writel(readl(&t2_base->devconf0) | MMCSDIO1ADPCLKISEL,
  96                 &t2_base->devconf0);
  97
  98         writel(readl(&t2_base->devconf1) | MMCSDIO2ADPCLKISEL,
  99                 &t2_base->devconf1);
 100
 101         writel(readl(&prcm_base->fclken1_core) |
 102                 EN_MMC1 | EN_MMC2 | EN_MMC3,
 103                 &prcm_base->fclken1_core);
 104
 105         writel(readl(&prcm_base->iclken1_core) |
 106                 EN_MMC1 | EN_MMC2 | EN_MMC3,
 107                 &prcm_base->iclken1_core);
 108
 109         return 1;
 110 }
 111
 112 void mmc_init_stream(void)
 113 {
 114         writel(readl(&mmc_base->con) | INIT_INITSTREAM, &mmc_base->con);
 115
 116         writel(MMC_CMD0, &mmc_base->cmd);
 117         while (!(readl(&mmc_base->stat) & CC_MASK));
 118
 119         writel(CC_MASK, &mmc_base->stat);
 120
 121         writel(MMC_CMD0, &mmc_base->cmd);
 122         while (!(readl(&mmc_base->stat) & CC_MASK));
 123
 124         writel(readl(&mmc_base->con) & ~INIT_INITSTREAM, &mmc_base->con);
 125 }
 126
 127 unsigned char mmc_clock_config(unsigned int iclk, unsigned short clk_div)
 128 {
 129         unsigned int val;
 130
 131         mmc_reg_out(&mmc_base->sysctl, (ICE_MASK | DTO_MASK | CEN_MASK),
 132                         (ICE_STOP | DTO_15THDTO | CEN_DISABLE));
 133
 134         switch (iclk) {
 135         case CLK_INITSEQ:
 136                 val = MMC_INIT_SEQ_CLK / 2;
 137                 break;
 138         case CLK_400KHZ:
 139                 val = MMC_400kHz_CLK;
 140                 break;
 141         case CLK_MISC:
 142                 val = clk_div;
 143                 break;
 144         default:
 145                 return 0;
 146         }
 147         mmc_reg_out(&mmc_base->sysctl, ICE_MASK | CLKD_MASK,
 148                         (val << CLKD_OFFSET) | ICE_OSCILLATE);
 149
 150         while ((readl(&mmc_base->sysctl) & ICS_MASK) == ICS_NOTREADY);
 151
 152         writel(readl(&mmc_base->sysctl) | CEN_ENABLE, &mmc_base->sysctl);
 153         return 1;
 154 }
 155
 156 unsigned char mmc_init_setup(void)
 157 {
 158         unsigned int reg_val;
 159
 160         mmc_board_init();
 161
 162         writel(readl(&mmc_base->sysconfig) | MMC_SOFTRESET,
 163                 &mmc_base->sysconfig);
 164         while ((readl(&mmc_base->sysstatus) & RESETDONE) == 0);
 165
 166         writel(readl(&mmc_base->sysctl) | SOFTRESETALL, &mmc_base->sysctl);
 167         while ((readl(&mmc_base->sysctl) & SOFTRESETALL) != 0x0);
 168
 169         writel(DTW_1_BITMODE | SDBP_PWROFF | SDVS_3V0, &mmc_base->hctl);
 170         writel(readl(&mmc_base->capa) | VS30_3V0SUP | VS18_1V8SUP,
 171                 &mmc_base->capa);
 172
 173         reg_val = readl(&mmc_base->con) & RESERVED_MASK;
 174
 175         writel(CTPL_MMC_SD | reg_val | WPP_ACTIVEHIGH | CDP_ACTIVEHIGH |
 176                 MIT_CTO | DW8_1_4BITMODE | MODE_FUNC | STR_BLOCK |
 177                 HR_NOHOSTRESP | INIT_NOINIT | NOOPENDRAIN, &mmc_base->con);
 178
 179         mmc_clock_config(CLK_INITSEQ, 0);
 180         writel(readl(&mmc_base->hctl) | SDBP_PWRON, &mmc_base->hctl);
 181
 182         writel(IE_BADA | IE_CERR | IE_DEB | IE_DCRC | IE_DTO | IE_CIE |
 183                 IE_CEB | IE_CCRC | IE_CTO | IE_BRR | IE_BWR | IE_TC | IE_CC,
 184                 &mmc_base->ie);
 185
 186         mmc_init_stream();
 187         return 1;
 188 }
 189
 190 unsigned char mmc_send_cmd(unsigned int cmd, unsigned int arg,
 191                                 unsigned int *response)
 192 {
 193         unsigned int mmc_stat;
 194
 195         while ((readl(&mmc_base->pstate) & DATI_MASK) == DATI_CMDDIS);
 196
 197         writel(BLEN_512BYTESLEN | NBLK_STPCNT, &mmc_base->blk);
 198         writel(0xFFFFFFFF, &mmc_base->stat);
 199         writel(arg, &mmc_base->arg);
 200         writel(cmd | CMD_TYPE_NORMAL | CICE_NOCHECK | CCCE_NOCHECK |
 201                 MSBS_SGLEBLK | ACEN_DISABLE | BCE_DISABLE | DE_DISABLE,
 202                 &mmc_base->cmd);
 203
 204         while (1) {
 205                 do {
 206                         mmc_stat = readl(&mmc_base->stat);
 207                 } while (mmc_stat == 0);
 208
 209                 if ((mmc_stat & ERRI_MASK) != 0)
 210                         return (unsigned char) mmc_stat;
 211
 212                 if (mmc_stat & CC_MASK) {
 213                         writel(CC_MASK, &mmc_base->stat);
 214                         response[0] = readl(&mmc_base->rsp10);
 215                         if ((cmd & RSP_TYPE_MASK) == RSP_TYPE_LGHT136) {
 216                                 response[1] = readl(&mmc_base->rsp32);
 217                                 response[2] = readl(&mmc_base->rsp54);
 218                                 response[3] = readl(&mmc_base->rsp76);
 219                         }
 220                         break;
 221                 }
 222         }
 223         return 1;
 224 }
 225
 226 unsigned char mmc_read_data(unsigned int *output_buf)
 227 {
 228         unsigned int mmc_stat;
 229         unsigned int read_count = 0;
 230
 231         /*
 232          * Start Polled Read
 233          */
 234         while (1) {
 235                 do {
 236                         mmc_stat = readl(&mmc_base->stat);
 237                 } while (mmc_stat == 0);
 238
 239                 if ((mmc_stat & ERRI_MASK) != 0)
 240                         return (unsigned char) mmc_stat;
 241
 242                 if (mmc_stat & BRR_MASK) {
 243                         unsigned int k;
 244
 245                         writel(readl(&mmc_base->stat) | BRR_MASK,
 246                                 &mmc_base->stat);
 247                         for (k = 0; k < MMCSD_SECTOR_SIZE / 4; k++) {
 248                                 *output_buf = readl(&mmc_base->data);
 249                                 output_buf++;
 250                                 read_count += 4;
 251                         }
 252                 }
 253
 254                 if (mmc_stat & BWR_MASK)
 255                         writel(readl(&mmc_base->stat) | BWR_MASK,
 256                                 &mmc_base->stat);
 257
 258                 if (mmc_stat & TC_MASK) {
 259                         writel(readl(&mmc_base->stat) | TC_MASK,
 260                                 &mmc_base->stat);
 261                         break;
 262                 }
 263         }
 264         return 1;
 265 }
 266
 267 unsigned char mmc_detect_card(mmc_card_data *mmc_card_cur)
 268 {
 269         unsigned char err;
 270         unsigned int argument = 0;
 271         unsigned int ocr_value, ocr_recvd, ret_cmd41, hcs_val;
 272         unsigned short retry_cnt = 2000;
 273         mmc_resp_t mmc_resp;
 274
 275         /* Set to Initialization Clock */
 276         err = mmc_clock_config(CLK_400KHZ, 0);
 277         if (err != 1)
 278                 return err;
 279
 280         mmc_card_cur->RCA = MMC_RELATIVE_CARD_ADDRESS;
 281         argument = 0x00000000;
 282
 283         ocr_value = (0x1FF << 15);
 284         err = mmc_send_cmd(MMC_CMD0, argument, mmc_resp.resp);
 285         if (err != 1)
 286                 return err;
 287
 288         argument = SD_CMD8_CHECK_PATTERN | SD_CMD8_2_7_3_6_V_RANGE;
 289         err = mmc_send_cmd(MMC_SDCMD8, argument, mmc_resp.resp);
 290         hcs_val = (err == 1) ?
 291                 MMC_OCR_REG_HOST_CAPACITY_SUPPORT_SECTOR :
 292                 MMC_OCR_REG_HOST_CAPACITY_SUPPORT_BYTE;
 293
 294         argument = 0x0000 << 16;
 295         err = mmc_send_cmd(MMC_CMD55, argument, mmc_resp.resp);
 296         if (err == 1) {
 297                 mmc_card_cur->card_type = SD_CARD;
 298                 ocr_value |= hcs_val;
 299                 ret_cmd41 = MMC_ACMD41;
 300         } else {
 301                 mmc_card_cur->card_type = MMC_CARD;
 302                 ocr_value |= MMC_OCR_REG_ACCESS_MODE_SECTOR;
 303                 ret_cmd41 = MMC_CMD1;
 304                 writel(readl(&mmc_base->con) & ~OD, &mmc_base->con);
 305                 writel(readl(&mmc_base->con) | OPENDRAIN, &mmc_base->con);
 306         }
 307
 308         argument = ocr_value;
 309         err = mmc_send_cmd(ret_cmd41, argument, mmc_resp.resp);
 310         if (err != 1)
 311                 return err;
 312
 313         ocr_recvd = mmc_resp.r3.ocr;
 314
 315         while (!(ocr_recvd & (0x1 << 31)) && (retry_cnt > 0)) {
 316                 retry_cnt--;
 317                 if (mmc_card_cur->card_type == SD_CARD) {
 318                         argument = 0x0000 << 16;
 319                         err = mmc_send_cmd(MMC_CMD55, argument, mmc_resp.resp);
 320                 }
 321
 322                 argument = ocr_value;
 323                 err = mmc_send_cmd(ret_cmd41, argument, mmc_resp.resp);
 324                 if (err != 1)
 325                         return err;
 326                 ocr_recvd = mmc_resp.r3.ocr;
 327         }
 328
 329         if (!(ocr_recvd & (0x1 << 31)))
 330                 return 0;
 331
 332         if (mmc_card_cur->card_type == MMC_CARD) {
 333                 if ((ocr_recvd & MMC_OCR_REG_ACCESS_MODE_MASK) ==
 334                         MMC_OCR_REG_ACCESS_MODE_SECTOR) {
 335                         mmc_card_cur->mode = SECTOR_MODE;
 336                 } else {
 337                         mmc_card_cur->mode = BYTE_MODE;
 338                 }
 339
 340                 ocr_recvd &= ~MMC_OCR_REG_ACCESS_MODE_MASK;
 341         } else {
 342                 if ((ocr_recvd & MMC_OCR_REG_HOST_CAPACITY_SUPPORT_MASK)
 343                         == MMC_OCR_REG_HOST_CAPACITY_SUPPORT_SECTOR) {
 344                         mmc_card_cur->mode = SECTOR_MODE;
 345                 } else {
 346                         mmc_card_cur->mode = BYTE_MODE;
 347                 }
 348                 ocr_recvd &= ~MMC_OCR_REG_HOST_CAPACITY_SUPPORT_MASK;
 349         }
 350
 351         ocr_recvd &= ~(0x1 << 31);
 352         if (!(ocr_recvd & ocr_value))
 353                 return 0;
 354
 355         err = mmc_send_cmd(MMC_CMD2, argument, mmc_resp.resp);
 356         if (err != 1)
 357                 return err;
 358
 359         if (mmc_card_cur->card_type == MMC_CARD) {
 360                 argument = mmc_card_cur->RCA << 16;
 361                 err = mmc_send_cmd(MMC_CMD3, argument, mmc_resp.resp);
 362                 if (err != 1)
 363                         return err;
 364         } else {
 365                 argument = 0x00000000;
 366                 err = mmc_send_cmd(MMC_SDCMD3, argument, mmc_resp.resp);
 367                 if (err != 1)
 368                         return err;
 369
 370                 mmc_card_cur->RCA = mmc_resp.r6.newpublishedrca;
 371         }
 372
 373         writel(readl(&mmc_base->con) & ~OD, &mmc_base->con);
 374         writel(readl(&mmc_base->con) | NOOPENDRAIN, &mmc_base->con);
 375         return 1;
 376 }
 377
 378 unsigned char mmc_read_cardsize(mmc_card_data *mmc_dev_data,
 379                                 mmc_csd_reg_t *cur_csd)
 380 {
 381         mmc_extended_csd_reg_t ext_csd;
 382         unsigned int size, count, blk_len, blk_no, card_size, argument;
 383         unsigned char err;
 384         unsigned int resp[4];
 385
 386         if (mmc_dev_data->mode == SECTOR_MODE) {
 387                 if (mmc_dev_data->card_type == SD_CARD) {
 388                         card_size =
 389                                 (((mmc_sd2_csd_reg_t *) cur_csd)->
 390                                 c_size_lsb & MMC_SD2_CSD_C_SIZE_LSB_MASK) |
 391                                 ((((mmc_sd2_csd_reg_t *) cur_csd)->
 392                                 c_size_msb & MMC_SD2_CSD_C_SIZE_MSB_MASK)
 393                                 << MMC_SD2_CSD_C_SIZE_MSB_OFFSET);
 394                         mmc_dev_data->size = card_size * 1024;
 395                         if (mmc_dev_data->size == 0)
 396                                 return 0;
 397                 } else {
 398                         argument = 0x00000000;
 399                         err = mmc_send_cmd(MMC_CMD8, argument, resp);
 400                         if (err != 1)
 401                                 return err;
 402                         err = mmc_read_data((unsigned int *) &ext_csd);
 403                         if (err != 1)
 404                                 return err;
 405                         mmc_dev_data->size = ext_csd.sectorcount;
 406
 407                         if (mmc_dev_data->size == 0)
 408                                 mmc_dev_data->size = 8388608;
 409                 }
 410         } else {
 411                 if (cur_csd->c_size_mult >= 8)
 412                         return 0;
 413
 414                 if (cur_csd->read_bl_len >= 12)
 415                         return 0;
 416
 417                 /* Compute size */
 418                 count = 1 << (cur_csd->c_size_mult + 2);
 419                 card_size = (cur_csd->c_size_lsb & MMC_CSD_C_SIZE_LSB_MASK) |
 420                         ((cur_csd->c_size_msb & MMC_CSD_C_SIZE_MSB_MASK)
 421                         << MMC_CSD_C_SIZE_MSB_OFFSET);
 422                 blk_no = (card_size + 1) * count;
 423                 blk_len = 1 << cur_csd->read_bl_len;
 424                 size = blk_no * blk_len;
 425                 mmc_dev_data->size = size / MMCSD_SECTOR_SIZE;
 426                 if (mmc_dev_data->size == 0)
 427                         return 0;
 428         }
 429         return 1;
 430 }
 431
 432 unsigned char omap_mmc_read_sect(unsigned int start_sec, unsigned int num_bytes,
 433                                  mmc_card_data *mmc_c,
 434                                  unsigned long *output_buf)
 435 {
 436         unsigned char err;
 437         unsigned int argument;
 438         unsigned int resp[4];
 439         unsigned int num_sec_val =
 440                 (num_bytes + (MMCSD_SECTOR_SIZE - 1)) / MMCSD_SECTOR_SIZE;
 441         unsigned int sec_inc_val;
 442
 443         if (num_sec_val == 0)
 444                 return 1;
 445
 446         if (mmc_c->mode == SECTOR_MODE) {
 447                 argument = start_sec;
 448                 sec_inc_val = 1;
 449         } else {
 450                 argument = start_sec * MMCSD_SECTOR_SIZE;
 451                 sec_inc_val = MMCSD_SECTOR_SIZE;
 452         }
 453
 454         while (num_sec_val) {
 455                 err = mmc_send_cmd(MMC_CMD17, argument, resp);
 456                 if (err != 1)
 457                         return err;
 458
 459                 err = mmc_read_data((unsigned int *) output_buf);
 460                 if (err != 1)
 461                         return err;
 462
 463                 output_buf += (MMCSD_SECTOR_SIZE / 4);
 464                 argument += sec_inc_val;
 465                 num_sec_val--;
 466         }
 467         return 1;
 468 }
 469
 470 unsigned char configure_mmc(mmc_card_data *mmc_card_cur)
 471 {
 472         unsigned char ret_val;
 473         unsigned int argument;
 474         unsigned int trans_clk, trans_fact, trans_unit, retries = 2;
 475         unsigned char trans_speed;
 476         mmc_resp_t mmc_resp;
 477
 478         ret_val = mmc_init_setup();
 479
 480         if (ret_val != 1)
 481                 return ret_val;
 482
 483         do {
 484                 ret_val = mmc_detect_card(mmc_card_cur);
 485                 retries--;
 486         } while ((retries > 0) && (ret_val != 1));
 487
 488         argument = mmc_card_cur->RCA << 16;
 489         ret_val = mmc_send_cmd(MMC_CMD9, argument, mmc_resp.resp);
 490         if (ret_val != 1)
 491                 return ret_val;
 492
 493         if (mmc_card_cur->card_type == MMC_CARD)
 494                 mmc_card_cur->version = mmc_resp.Card_CSD.spec_vers;
 495
 496         trans_speed = mmc_resp.Card_CSD.tran_speed;
 497
 498         ret_val = mmc_send_cmd(MMC_CMD4, MMC_DSR_DEFAULT << 16, mmc_resp.resp);
 499         if (ret_val != 1)
 500                 return ret_val;
 501
 502         trans_unit = trans_speed & MMC_CSD_TRAN_SPEED_UNIT_MASK;
 503         trans_fact = trans_speed & MMC_CSD_TRAN_SPEED_FACTOR_MASK;
 504
 505         if (trans_unit > MMC_CSD_TRAN_SPEED_UNIT_100MHZ)
 506                 return 0;
 507
 508         if ((trans_fact < MMC_CSD_TRAN_SPEED_FACTOR_1_0) ||
 509                 (trans_fact > MMC_CSD_TRAN_SPEED_FACTOR_8_0))
 510                 return 0;
 511
 512         trans_unit >>= 0;
 513         trans_fact >>= 3;
 514
 515         trans_clk = mmc_transspeed_val[trans_fact - 1][trans_unit] * 2;
 516         ret_val = mmc_clock_config(CLK_MISC, trans_clk);
 517
 518         if (ret_val != 1)
 519                 return ret_val;
 520
 521         argument = mmc_card_cur->RCA << 16;
 522         ret_val = mmc_send_cmd(MMC_CMD7_SELECT, argument, mmc_resp.resp);
 523         if (ret_val != 1)
 524                 return ret_val;
 525
 526         /* Configure the block length to 512 bytes */
 527         argument = MMCSD_SECTOR_SIZE;
 528         ret_val = mmc_send_cmd(MMC_CMD16, argument, mmc_resp.resp);
 529         if (ret_val != 1)
 530                 return ret_val;
 531
 532         /* get the card size in sectors */
 533         ret_val = mmc_read_cardsize(mmc_card_cur, &mmc_resp.Card_CSD);
 534         if (ret_val != 1)
 535                 return ret_val;
 536
 537         return 1;
 538 }
 539 unsigned long mmc_bread(int dev_num, unsigned long blknr, lbaint_t blkcnt,
 540                         void *dst)
 541 {
 542         omap_mmc_read_sect(blknr, (blkcnt * MMCSD_SECTOR_SIZE), &cur_card_data,
 543                                 (unsigned long *) dst);
 544         return 1;
 545 }
 546
 547 int mmc_legacy_init(int dev)
 548 {
 549         if (mmc_set_dev(dev) != 0)
 550                 return 1;
 551
 552         if (configure_mmc(&cur_card_data) != 1)
 553                 return 1;
 554
 555         mmc_blk_dev.if_type = IF_TYPE_MMC;
 556         mmc_blk_dev.part_type = PART_TYPE_DOS;
 557         mmc_blk_dev.dev = 0;
 558         mmc_blk_dev.lun = 0;
 559         mmc_blk_dev.type = 0;
 560
 561         /* FIXME fill in the correct size (is set to 32MByte) */
 562         mmc_blk_dev.blksz = MMCSD_SECTOR_SIZE;
 563         mmc_blk_dev.lba = 0x10000;
 564         mmc_blk_dev.removable = 0;
 565         mmc_blk_dev.block_read = mmc_bread;
 566
 567         fat_register_device(&mmc_blk_dev, 1);
 568         return 0;
 569 }