drivers/mmc/sdhci.c

   1 /*
   2  * Copyright 2011, Marvell Semiconductor Inc.
   3  * Lei Wen <leiwen@marvell.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Back ported to the 8xx platform (from the 8260 platform) by
   8  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
   9  */
  10
  11 #include <common.h>
  12 #include <malloc.h>
  13 #include <mmc.h>
  14 #include <sdhci.h>
  15
  16 #if defined(CONFIG_FIXED_SDHCI_ALIGNED_BUFFER)
  17 void *aligned_buffer = (void *)CONFIG_FIXED_SDHCI_ALIGNED_BUFFER;
  18 #else
  19 void *aligned_buffer;
  20 #endif
  21
  22 static void sdhci_reset(struct sdhci_host *host, u8 mask)
  23 {
  24         unsigned long timeout;
  25
  26         /* Wait max 100 ms */
  27         timeout = 100;
  28         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
  29         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
  30                 if (timeout == 0) {
  31                         printf("%s: Reset 0x%x never completed.\n",
  32                                __func__, (int)mask);
  33                         return;
  34                 }
  35                 timeout--;
  36                 udelay(1000);
  37         }
  38 }
  39
  40 static void sdhci_cmd_done(struct sdhci_host *host, struct mmc_cmd *cmd)
  41 {
  42         int i;
  43         if (cmd->resp_type & MMC_RSP_136) {
  44                 /* CRC is stripped so we need to do some shifting. */
  45                 for (i = 0; i < 4; i++) {
  46                         cmd->response[i] = sdhci_readl(host,
  47                                         SDHCI_RESPONSE + (3-i)*4) << 8;
  48                         if (i != 3)
  49                                 cmd->response[i] |= sdhci_readb(host,
  50                                                 SDHCI_RESPONSE + (3-i)*4-1);
  51                 }
  52         } else {
  53                 cmd->response[0] = sdhci_readl(host, SDHCI_RESPONSE);
  54         }
  55 }
  56
  57 static void sdhci_transfer_pio(struct sdhci_host *host, struct mmc_data *data)
  58 {
  59         int i;
  60         char *offs;
  61         for (i = 0; i < data->blocksize; i += 4) {
  62                 offs = data->dest + i;
  63                 if (data->flags == MMC_DATA_READ)
  64                         *(u32 *)offs = sdhci_readl(host, SDHCI_BUFFER);
  65                 else
  66                         sdhci_writel(host, *(u32 *)offs, SDHCI_BUFFER);
  67         }
  68 }
  69
  70 static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
  71                                 unsigned int start_addr)
  72 {
  73         unsigned int stat, rdy, mask, timeout, block = 0;
  74 #ifdef CONFIG_MMC_SDMA
  75         unsigned char ctrl;
  76         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
  77         ctrl &= ~SDHCI_CTRL_DMA_MASK;
  78         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
  79 #endif
  80
  81         timeout = 1000000;
  82         rdy = SDHCI_INT_SPACE_AVAIL | SDHCI_INT_DATA_AVAIL;
  83         mask = SDHCI_DATA_AVAILABLE | SDHCI_SPACE_AVAILABLE;
  84         do {
  85                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
  86                 if (stat & SDHCI_INT_ERROR) {
  87                         printf("%s: Error detected in status(0x%X)!\n",
  88                                __func__, stat);
  89                         return -1;
  90                 }
  91                 if (stat & rdy) {
  92                         if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & mask))
  93                                 continue;
  94                         sdhci_writel(host, rdy, SDHCI_INT_STATUS);
  95                         sdhci_transfer_pio(host, data);
  96                         data->dest += data->blocksize;
  97                         if (++block >= data->blocks)
  98                                 break;
  99                 }
 100 #ifdef CONFIG_MMC_SDMA
 101                 if (stat & SDHCI_INT_DMA_END) {
 102                         sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
 103                         start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
 104                         start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
 105                         sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 106                 }
 107 #endif
 108                 if (timeout-- > 0)
 109                         udelay(10);
 110                 else {
 111                         printf("%s: Transfer data timeout\n", __func__);
 112                         return -1;
 113                 }
 114         } while (!(stat & SDHCI_INT_DATA_END));
 115         return 0;
 116 }
 117
 118 /*
 119  * No command will be sent by driver if card is busy, so driver must wait
 120  * for card ready state.
 121  * Every time when card is busy after timeout then (last) timeout value will be
 122  * increased twice but only if it doesn't exceed global defined maximum.
 123  * Each function call will use last timeout value. Max timeout can be redefined
 124  * in board config file.
 125  */
 126 #ifndef CONFIG_SDHCI_CMD_MAX_TIMEOUT
 127 #define CONFIG_SDHCI_CMD_MAX_TIMEOUT            3200
 128 #endif
 129 #define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT        100
 130 #define SDHCI_READ_STATUS_TIMEOUT               1000
 131
 132 static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 133                        struct mmc_data *data)
 134 {
 135         struct sdhci_host *host = mmc->priv;
 136         unsigned int stat = 0;
 137         int ret = 0;
 138         int trans_bytes = 0, is_aligned = 1;
 139         u32 mask, flags, mode;
 140         unsigned int time = 0, start_addr = 0;
 141         int mmc_dev = mmc_get_blk_desc(mmc)->devnum;
 142         unsigned start = get_timer(0);
 143
 144         /* Timeout unit - ms */
 145         static unsigned int cmd_timeout = CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT;
 146
 147         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 148         mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;
 149
 150         /* We shouldn't wait for data inihibit for stop commands, even
 151            though they might use busy signaling */
 152         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 153                 mask &= ~SDHCI_DATA_INHIBIT;
 154
 155         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 156                 if (time >= cmd_timeout) {
 157                         printf("%s: MMC: %d busy ", __func__, mmc_dev);
 158                         if (2 * cmd_timeout <= CONFIG_SDHCI_CMD_MAX_TIMEOUT) {
 159                                 cmd_timeout += cmd_timeout;
 160                                 printf("timeout increasing to: %u ms.\n",
 161                                        cmd_timeout);
 162                         } else {
 163                                 puts("timeout.\n");
 164                                 return COMM_ERR;
 165                         }
 166                 }
 167                 time++;
 168                 udelay(1000);
 169         }
 170
 171         mask = SDHCI_INT_RESPONSE;
 172         if (!(cmd->resp_type & MMC_RSP_PRESENT))
 173                 flags = SDHCI_CMD_RESP_NONE;
 174         else if (cmd->resp_type & MMC_RSP_136)
 175                 flags = SDHCI_CMD_RESP_LONG;
 176         else if (cmd->resp_type & MMC_RSP_BUSY) {
 177                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 178                 mask |= SDHCI_INT_DATA_END;
 179         } else
 180                 flags = SDHCI_CMD_RESP_SHORT;
 181
 182         if (cmd->resp_type & MMC_RSP_CRC)
 183                 flags |= SDHCI_CMD_CRC;
 184         if (cmd->resp_type & MMC_RSP_OPCODE)
 185                 flags |= SDHCI_CMD_INDEX;
 186         if (data)
 187                 flags |= SDHCI_CMD_DATA;
 188
 189         /* Set Transfer mode regarding to data flag */
 190         if (data != 0) {
 191                 sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
 192                 mode = SDHCI_TRNS_BLK_CNT_EN;
 193                 trans_bytes = data->blocks * data->blocksize;
 194                 if (data->blocks > 1)
 195                         mode |= SDHCI_TRNS_MULTI;
 196
 197                 if (data->flags == MMC_DATA_READ)
 198                         mode |= SDHCI_TRNS_READ;
 199
 200 #ifdef CONFIG_MMC_SDMA
 201                 if (data->flags == MMC_DATA_READ)
 202                         start_addr = (unsigned long)data->dest;
 203                 else
 204                         start_addr = (unsigned long)data->src;
 205                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 206                                 (start_addr & 0x7) != 0x0) {
 207                         is_aligned = 0;
 208                         start_addr = (unsigned long)aligned_buffer;
 209                         if (data->flags != MMC_DATA_READ)
 210                                 memcpy(aligned_buffer, data->src, trans_bytes);
 211                 }
 212
 213 #if defined(CONFIG_FIXED_SDHCI_ALIGNED_BUFFER)
 214                 /*
 215                  * Always use this bounce-buffer when
 216                  * CONFIG_FIXED_SDHCI_ALIGNED_BUFFER is defined
 217                  */
 218                 is_aligned = 0;
 219                 start_addr = (unsigned long)aligned_buffer;
 220                 if (data->flags != MMC_DATA_READ)
 221                         memcpy(aligned_buffer, data->src, trans_bytes);
 222 #endif
 223
 224                 sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 225                 mode |= SDHCI_TRNS_DMA;
 226 #endif
 227                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 228                                 data->blocksize),
 229                                 SDHCI_BLOCK_SIZE);
 230                 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 231                 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 232         } else if (cmd->resp_type & MMC_RSP_BUSY) {
 233                 sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
 234         }
 235
 236         sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
 237 #ifdef CONFIG_MMC_SDMA
 238         flush_cache(start_addr, trans_bytes);
 239 #endif
 240         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
 241         start = get_timer(0);
 242         do {
 243                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
 244                 if (stat & SDHCI_INT_ERROR)
 245                         break;
 246         } while (((stat & mask) != mask) &&
 247                  (get_timer(start) < SDHCI_READ_STATUS_TIMEOUT));
 248
 249         if (get_timer(start) >= SDHCI_READ_STATUS_TIMEOUT) {
 250                 if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
 251                         return 0;
 252                 else {
 253                         printf("%s: Timeout for status update!\n", __func__);
 254                         return TIMEOUT;
 255                 }
 256         }
 257
 258         if ((stat & (SDHCI_INT_ERROR | mask)) == mask) {
 259                 sdhci_cmd_done(host, cmd);
 260                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
 261         } else
 262                 ret = -1;
 263
 264         if (!ret && data)
 265                 ret = sdhci_transfer_data(host, data, start_addr);
 266
 267         if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD)
 268                 udelay(1000);
 269
 270         stat = sdhci_readl(host, SDHCI_INT_STATUS);
 271         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 272         if (!ret) {
 273                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 274                                 !is_aligned && (data->flags == MMC_DATA_READ))
 275                         memcpy(data->dest, aligned_buffer, trans_bytes);
 276                 return 0;
 277         }
 278
 279         sdhci_reset(host, SDHCI_RESET_CMD);
 280         sdhci_reset(host, SDHCI_RESET_DATA);
 281         if (stat & SDHCI_INT_TIMEOUT)
 282                 return TIMEOUT;
 283         else
 284                 return COMM_ERR;
 285 }
 286
 287 static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
 288 {
 289         struct sdhci_host *host = mmc->priv;
 290         unsigned int div, clk, timeout, reg;
 291
 292         /* Wait max 20 ms */
 293         timeout = 200;
 294         while (sdhci_readl(host, SDHCI_PRESENT_STATE) &
 295                            (SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT)) {
 296                 if (timeout == 0) {
 297                         printf("%s: Timeout to wait cmd & data inhibit\n",
 298                                __func__);
 299                         return -1;
 300                 }
 301
 302                 timeout--;
 303                 udelay(100);
 304         }
 305
 306         reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
 307         reg &= ~SDHCI_CLOCK_CARD_EN;
 308         sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL);
 309
 310         if (clock == 0)
 311                 return 0;
 312
 313         if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
 314                 /* Version 3.00 divisors must be a multiple of 2. */
 315                 if (mmc->cfg->f_max <= clock)
 316                         div = 1;
 317                 else {
 318                         for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
 319                                 if ((mmc->cfg->f_max / div) <= clock)
 320                                         break;
 321                         }
 322                 }
 323         } else {
 324                 /* Version 2.00 divisors must be a power of 2. */
 325                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
 326                         if ((mmc->cfg->f_max / div) <= clock)
 327                                 break;
 328                 }
 329         }
 330         div >>= 1;
 331
 332         if (host->set_clock)
 333                 host->set_clock(host->index, div);
 334
 335         clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
 336         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
 337                 << SDHCI_DIVIDER_HI_SHIFT;
 338         clk |= SDHCI_CLOCK_INT_EN;
 339         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 340
 341         /* Wait max 20 ms */
 342         timeout = 20;
 343         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
 344                 & SDHCI_CLOCK_INT_STABLE)) {
 345                 if (timeout == 0) {
 346                         printf("%s: Internal clock never stabilised.\n",
 347                                __func__);
 348                         return -1;
 349                 }
 350                 timeout--;
 351                 udelay(1000);
 352         }
 353
 354         clk |= SDHCI_CLOCK_CARD_EN;
 355         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 356         return 0;
 357 }
 358
 359 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 360 {
 361         u8 pwr = 0;
 362
 363         if (power != (unsigned short)-1) {
 364                 switch (1 << power) {
 365                 case MMC_VDD_165_195:
 366                         pwr = SDHCI_POWER_180;
 367                         break;
 368                 case MMC_VDD_29_30:
 369                 case MMC_VDD_30_31:
 370                         pwr = SDHCI_POWER_300;
 371                         break;
 372                 case MMC_VDD_32_33:
 373                 case MMC_VDD_33_34:
 374                         pwr = SDHCI_POWER_330;
 375                         break;
 376                 }
 377         }
 378
 379         if (pwr == 0) {
 380                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
 381                 return;
 382         }
 383
 384         if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
 385                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
 386
 387         pwr |= SDHCI_POWER_ON;
 388
 389         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
 390 }
 391
 392 static void sdhci_set_ios(struct mmc *mmc)
 393 {
 394         u32 ctrl;
 395         struct sdhci_host *host = mmc->priv;
 396
 397         if (host->set_control_reg)
 398                 host->set_control_reg(host);
 399
 400         if (mmc->clock != host->clock)
 401                 sdhci_set_clock(mmc, mmc->clock);
 402
 403         /* Set bus width */
 404         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 405         if (mmc->bus_width == 8) {
 406                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 407                 if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) ||
 408                                 (host->quirks & SDHCI_QUIRK_USE_WIDE8))
 409                         ctrl |= SDHCI_CTRL_8BITBUS;
 410         } else {
 411                 if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) ||
 412                                 (host->quirks & SDHCI_QUIRK_USE_WIDE8))
 413                         ctrl &= ~SDHCI_CTRL_8BITBUS;
 414                 if (mmc->bus_width == 4)
 415                         ctrl |= SDHCI_CTRL_4BITBUS;
 416                 else
 417                         ctrl &= ~SDHCI_CTRL_4BITBUS;
 418         }
 419
 420         if (mmc->clock > 26000000)
 421                 ctrl |= SDHCI_CTRL_HISPD;
 422         else
 423                 ctrl &= ~SDHCI_CTRL_HISPD;
 424
 425         if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
 426                 ctrl &= ~SDHCI_CTRL_HISPD;
 427
 428         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 429 }
 430
 431 static int sdhci_init(struct mmc *mmc)
 432 {
 433         struct sdhci_host *host = mmc->priv;
 434
 435         if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) && !aligned_buffer) {
 436                 aligned_buffer = memalign(8, 512*1024);
 437                 if (!aligned_buffer) {
 438                         printf("%s: Aligned buffer alloc failed!!!\n",
 439                                __func__);
 440                         return -1;
 441                 }
 442         }
 443
 444         sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);
 445
 446         if (host->quirks & SDHCI_QUIRK_NO_CD) {
 447 #if defined(CONFIG_PIC32_SDHCI)
 448                 /* PIC32 SDHCI CD errata:
 449                  * - set CD_TEST and clear CD_TEST_INS bit
 450                  */
 451                 sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
 452 #else
 453                 unsigned int status;
 454
 455                 sdhci_writeb(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
 456                         SDHCI_HOST_CONTROL);
 457
 458                 status = sdhci_readl(host, SDHCI_PRESENT_STATE);
 459                 while ((!(status & SDHCI_CARD_PRESENT)) ||
 460                     (!(status & SDHCI_CARD_STATE_STABLE)) ||
 461                     (!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
 462                         status = sdhci_readl(host, SDHCI_PRESENT_STATE);
 463 #endif
 464         }
 465
 466         /* Enable only interrupts served by the SD controller */
 467         sdhci_writel(host, SDHCI_INT_DATA_MASK | SDHCI_INT_CMD_MASK,
 468                      SDHCI_INT_ENABLE);
 469         /* Mask all sdhci interrupt sources */
 470         sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);
 471
 472         return 0;
 473 }
 474
 475
 476 static const struct mmc_ops sdhci_ops = {
 477         .send_cmd       = sdhci_send_command,
 478         .set_ios        = sdhci_set_ios,
 479         .init           = sdhci_init,
 480 };
 481
 482 int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
 483 {
 484         unsigned int caps;
 485
 486         host->cfg.name = host->name;
 487         host->cfg.ops = &sdhci_ops;
 488
 489         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 490 #ifdef CONFIG_MMC_SDMA
 491         if (!(caps & SDHCI_CAN_DO_SDMA)) {
 492                 printf("%s: Your controller doesn't support SDMA!!\n",
 493                        __func__);
 494                 return -1;
 495         }
 496 #endif
 497
 498         if (max_clk)
 499                 host->cfg.f_max = max_clk;
 500         else {
 501                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 502                         host->cfg.f_max = (caps & SDHCI_CLOCK_V3_BASE_MASK)
 503                                 >> SDHCI_CLOCK_BASE_SHIFT;
 504                 else
 505                         host->cfg.f_max = (caps & SDHCI_CLOCK_BASE_MASK)
 506                                 >> SDHCI_CLOCK_BASE_SHIFT;
 507                 host->cfg.f_max *= 1000000;
 508         }
 509         if (host->cfg.f_max == 0) {
 510                 printf("%s: Hardware doesn't specify base clock frequency\n",
 511                        __func__);
 512                 return -1;
 513         }
 514         if (min_clk)
 515                 host->cfg.f_min = min_clk;
 516         else {
 517                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 518                         host->cfg.f_min = host->cfg.f_max /
 519                                 SDHCI_MAX_DIV_SPEC_300;
 520                 else
 521                         host->cfg.f_min = host->cfg.f_max /
 522                                 SDHCI_MAX_DIV_SPEC_200;
 523         }
 524
 525         host->cfg.voltages = 0;
 526         if (caps & SDHCI_CAN_VDD_330)
 527                 host->cfg.voltages |= MMC_VDD_32_33 | MMC_VDD_33_34;
 528         if (caps & SDHCI_CAN_VDD_300)
 529                 host->cfg.voltages |= MMC_VDD_29_30 | MMC_VDD_30_31;
 530         if (caps & SDHCI_CAN_VDD_180)
 531                 host->cfg.voltages |= MMC_VDD_165_195;
 532
 533         if (host->quirks & SDHCI_QUIRK_BROKEN_VOLTAGE)
 534                 host->cfg.voltages |= host->voltages;
 535
 536         host->cfg.host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT;
 537         if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
 538                 if (caps & SDHCI_CAN_DO_8BIT)
 539                         host->cfg.host_caps |= MMC_MODE_8BIT;
 540         }
 541
 542         if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
 543                 host->cfg.host_caps &= ~(MMC_MODE_HS | MMC_MODE_HS_52MHz);
 544
 545         if (host->host_caps)
 546                 host->cfg.host_caps |= host->host_caps;
 547
 548         host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 549
 550         sdhci_reset(host, SDHCI_RESET_ALL);
 551
 552         host->mmc = mmc_create(&host->cfg, host);
 553         if (host->mmc == NULL) {
 554                 printf("%s: mmc create fail!\n", __func__);
 555                 return -1;
 556         }
 557
 558         return 0;
 559 }