git.sur5r.net Git - u-boot/blob - drivers/mmc/tegra_mmc.c

   1 /*
   2  * (C) Copyright 2009 SAMSUNG Electronics
   3  * Minkyu Kang <mk7.kang@samsung.com>
   4  * Jaehoon Chung <jh80.chung@samsung.com>
   5  * Portions Copyright 2011-2016 NVIDIA Corporation
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <bouncebuf.h>
  11 #include <common.h>
  12 #include <dm/device.h>
  13 #include <errno.h>
  14 #include <asm/gpio.h>
  15 #include <asm/io.h>
  16 #include <asm/arch-tegra/tegra_mmc.h>
  17 #include <mmc.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 struct tegra_mmc_priv {
  22         struct tegra_mmc *reg;
  23         struct reset_ctl reset_ctl;
  24         struct clk clk;
  25         struct gpio_desc cd_gpio;       /* Change Detect GPIO */
  26         struct gpio_desc pwr_gpio;      /* Power GPIO */
  27         struct gpio_desc wp_gpio;       /* Write Protect GPIO */
  28         unsigned int version;   /* SDHCI spec. version */
  29         unsigned int clock;     /* Current clock (MHz) */
  30         struct mmc_config cfg;  /* mmc configuration */
  31         struct mmc *mmc;
  32 };
  33
  34 static void tegra_mmc_set_power(struct tegra_mmc_priv *priv,
  35                                 unsigned short power)
  36 {
  37         u8 pwr = 0;
  38         debug("%s: power = %x\n", __func__, power);
  39
  40         if (power != (unsigned short)-1) {
  41                 switch (1 << power) {
  42                 case MMC_VDD_165_195:
  43                         pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V1_8;
  44                         break;
  45                 case MMC_VDD_29_30:
  46                 case MMC_VDD_30_31:
  47                         pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V3_0;
  48                         break;
  49                 case MMC_VDD_32_33:
  50                 case MMC_VDD_33_34:
  51                         pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V3_3;
  52                         break;
  53                 }
  54         }
  55         debug("%s: pwr = %X\n", __func__, pwr);
  56
  57         /* Set the bus voltage first (if any) */
  58         writeb(pwr, &priv->reg->pwrcon);
  59         if (pwr == 0)
  60                 return;
  61
  62         /* Now enable bus power */
  63         pwr |= TEGRA_MMC_PWRCTL_SD_BUS_POWER;
  64         writeb(pwr, &priv->reg->pwrcon);
  65 }
  66
  67 static void tegra_mmc_prepare_data(struct tegra_mmc_priv *priv,
  68                                    struct mmc_data *data,
  69                                    struct bounce_buffer *bbstate)
  70 {
  71         unsigned char ctrl;
  72
  73
  74         debug("buf: %p (%p), data->blocks: %u, data->blocksize: %u\n",
  75                 bbstate->bounce_buffer, bbstate->user_buffer, data->blocks,
  76                 data->blocksize);
  77
  78         writel((u32)(unsigned long)bbstate->bounce_buffer, &priv->reg->sysad);
  79         /*
  80          * DMASEL[4:3]
  81          * 00 = Selects SDMA
  82          * 01 = Reserved
  83          * 10 = Selects 32-bit Address ADMA2
  84          * 11 = Selects 64-bit Address ADMA2
  85          */
  86         ctrl = readb(&priv->reg->hostctl);
  87         ctrl &= ~TEGRA_MMC_HOSTCTL_DMASEL_MASK;
  88         ctrl |= TEGRA_MMC_HOSTCTL_DMASEL_SDMA;
  89         writeb(ctrl, &priv->reg->hostctl);
  90
  91         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
  92         writew((7 << 12) | (data->blocksize & 0xFFF), &priv->reg->blksize);
  93         writew(data->blocks, &priv->reg->blkcnt);
  94 }
  95
  96 static void tegra_mmc_set_transfer_mode(struct tegra_mmc_priv *priv,
  97                                         struct mmc_data *data)
  98 {
  99         unsigned short mode;
 100         debug(" mmc_set_transfer_mode called\n");
 101         /*
 102          * TRNMOD
 103          * MUL1SIN0[5]  : Multi/Single Block Select
 104          * RD1WT0[4]    : Data Transfer Direction Select
 105          *      1 = read
 106          *      0 = write
 107          * ENACMD12[2]  : Auto CMD12 Enable
 108          * ENBLKCNT[1]  : Block Count Enable
 109          * ENDMA[0]     : DMA Enable
 110          */
 111         mode = (TEGRA_MMC_TRNMOD_DMA_ENABLE |
 112                 TEGRA_MMC_TRNMOD_BLOCK_COUNT_ENABLE);
 113
 114         if (data->blocks > 1)
 115                 mode |= TEGRA_MMC_TRNMOD_MULTI_BLOCK_SELECT;
 116
 117         if (data->flags & MMC_DATA_READ)
 118                 mode |= TEGRA_MMC_TRNMOD_DATA_XFER_DIR_SEL_READ;
 119
 120         writew(mode, &priv->reg->trnmod);
 121 }
 122
 123 static int tegra_mmc_wait_inhibit(struct tegra_mmc_priv *priv,
 124                                   struct mmc_cmd *cmd,
 125                                   struct mmc_data *data,
 126                                   unsigned int timeout)
 127 {
 128         /*
 129          * PRNSTS
 130          * CMDINHDAT[1] : Command Inhibit (DAT)
 131          * CMDINHCMD[0] : Command Inhibit (CMD)
 132          */
 133         unsigned int mask = TEGRA_MMC_PRNSTS_CMD_INHIBIT_CMD;
 134
 135         /*
 136          * We shouldn't wait for data inhibit for stop commands, even
 137          * though they might use busy signaling
 138          */
 139         if ((data == NULL) && (cmd->resp_type & MMC_RSP_BUSY))
 140                 mask |= TEGRA_MMC_PRNSTS_CMD_INHIBIT_DAT;
 141
 142         while (readl(&priv->reg->prnsts) & mask) {
 143                 if (timeout == 0) {
 144                         printf("%s: timeout error\n", __func__);
 145                         return -1;
 146                 }
 147                 timeout--;
 148                 udelay(1000);
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int tegra_mmc_send_cmd_bounced(struct mmc *mmc, struct mmc_cmd *cmd,
 155                                       struct mmc_data *data,
 156                                       struct bounce_buffer *bbstate)
 157 {
 158         struct tegra_mmc_priv *priv = mmc->priv;
 159         int flags, i;
 160         int result;
 161         unsigned int mask = 0;
 162         unsigned int retry = 0x100000;
 163         debug(" mmc_send_cmd called\n");
 164
 165         result = tegra_mmc_wait_inhibit(priv, cmd, data, 10 /* ms */);
 166
 167         if (result < 0)
 168                 return result;
 169
 170         if (data)
 171                 tegra_mmc_prepare_data(priv, data, bbstate);
 172
 173         debug("cmd->arg: %08x\n", cmd->cmdarg);
 174         writel(cmd->cmdarg, &priv->reg->argument);
 175
 176         if (data)
 177                 tegra_mmc_set_transfer_mode(priv, data);
 178
 179         if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
 180                 return -1;
 181
 182         /*
 183          * CMDREG
 184          * CMDIDX[13:8] : Command index
 185          * DATAPRNT[5]  : Data Present Select
 186          * ENCMDIDX[4]  : Command Index Check Enable
 187          * ENCMDCRC[3]  : Command CRC Check Enable
 188          * RSPTYP[1:0]
 189          *      00 = No Response
 190          *      01 = Length 136
 191          *      10 = Length 48
 192          *      11 = Length 48 Check busy after response
 193          */
 194         if (!(cmd->resp_type & MMC_RSP_PRESENT))
 195                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_NO_RESPONSE;
 196         else if (cmd->resp_type & MMC_RSP_136)
 197                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_136;
 198         else if (cmd->resp_type & MMC_RSP_BUSY)
 199                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_48_BUSY;
 200         else
 201                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_48;
 202
 203         if (cmd->resp_type & MMC_RSP_CRC)
 204                 flags |= TEGRA_MMC_TRNMOD_CMD_CRC_CHECK;
 205         if (cmd->resp_type & MMC_RSP_OPCODE)
 206                 flags |= TEGRA_MMC_TRNMOD_CMD_INDEX_CHECK;
 207         if (data)
 208                 flags |= TEGRA_MMC_TRNMOD_DATA_PRESENT_SELECT_DATA_TRANSFER;
 209
 210         debug("cmd: %d\n", cmd->cmdidx);
 211
 212         writew((cmd->cmdidx << 8) | flags, &priv->reg->cmdreg);
 213
 214         for (i = 0; i < retry; i++) {
 215                 mask = readl(&priv->reg->norintsts);
 216                 /* Command Complete */
 217                 if (mask & TEGRA_MMC_NORINTSTS_CMD_COMPLETE) {
 218                         if (!data)
 219                                 writel(mask, &priv->reg->norintsts);
 220                         break;
 221                 }
 222         }
 223
 224         if (i == retry) {
 225                 printf("%s: waiting for status update\n", __func__);
 226                 writel(mask, &priv->reg->norintsts);
 227                 return -ETIMEDOUT;
 228         }
 229
 230         if (mask & TEGRA_MMC_NORINTSTS_CMD_TIMEOUT) {
 231                 /* Timeout Error */
 232                 debug("timeout: %08x cmd %d\n", mask, cmd->cmdidx);
 233                 writel(mask, &priv->reg->norintsts);
 234                 return -ETIMEDOUT;
 235         } else if (mask & TEGRA_MMC_NORINTSTS_ERR_INTERRUPT) {
 236                 /* Error Interrupt */
 237                 debug("error: %08x cmd %d\n", mask, cmd->cmdidx);
 238                 writel(mask, &priv->reg->norintsts);
 239                 return -1;
 240         }
 241
 242         if (cmd->resp_type & MMC_RSP_PRESENT) {
 243                 if (cmd->resp_type & MMC_RSP_136) {
 244                         /* CRC is stripped so we need to do some shifting. */
 245                         for (i = 0; i < 4; i++) {
 246                                 unsigned long offset = (unsigned long)
 247                                         (&priv->reg->rspreg3 - i);
 248                                 cmd->response[i] = readl(offset) << 8;
 249
 250                                 if (i != 3) {
 251                                         cmd->response[i] |=
 252                                                 readb(offset - 1);
 253                                 }
 254                                 debug("cmd->resp[%d]: %08x\n",
 255                                                 i, cmd->response[i]);
 256                         }
 257                 } else if (cmd->resp_type & MMC_RSP_BUSY) {
 258                         for (i = 0; i < retry; i++) {
 259                                 /* PRNTDATA[23:20] : DAT[3:0] Line Signal */
 260                                 if (readl(&priv->reg->prnsts)
 261                                         & (1 << 20))    /* DAT[0] */
 262                                         break;
 263                         }
 264
 265                         if (i == retry) {
 266                                 printf("%s: card is still busy\n", __func__);
 267                                 writel(mask, &priv->reg->norintsts);
 268                                 return -ETIMEDOUT;
 269                         }
 270
 271                         cmd->response[0] = readl(&priv->reg->rspreg0);
 272                         debug("cmd->resp[0]: %08x\n", cmd->response[0]);
 273                 } else {
 274                         cmd->response[0] = readl(&priv->reg->rspreg0);
 275                         debug("cmd->resp[0]: %08x\n", cmd->response[0]);
 276                 }
 277         }
 278
 279         if (data) {
 280                 unsigned long   start = get_timer(0);
 281
 282                 while (1) {
 283                         mask = readl(&priv->reg->norintsts);
 284
 285                         if (mask & TEGRA_MMC_NORINTSTS_ERR_INTERRUPT) {
 286                                 /* Error Interrupt */
 287                                 writel(mask, &priv->reg->norintsts);
 288                                 printf("%s: error during transfer: 0x%08x\n",
 289                                                 __func__, mask);
 290                                 return -1;
 291                         } else if (mask & TEGRA_MMC_NORINTSTS_DMA_INTERRUPT) {
 292                                 /*
 293                                  * DMA Interrupt, restart the transfer where
 294                                  * it was interrupted.
 295                                  */
 296                                 unsigned int address = readl(&priv->reg->sysad);
 297
 298                                 debug("DMA end\n");
 299                                 writel(TEGRA_MMC_NORINTSTS_DMA_INTERRUPT,
 300                                        &priv->reg->norintsts);
 301                                 writel(address, &priv->reg->sysad);
 302                         } else if (mask & TEGRA_MMC_NORINTSTS_XFER_COMPLETE) {
 303                                 /* Transfer Complete */
 304                                 debug("r/w is done\n");
 305                                 break;
 306                         } else if (get_timer(start) > 8000UL) {
 307                                 writel(mask, &priv->reg->norintsts);
 308                                 printf("%s: MMC Timeout\n"
 309                                        "    Interrupt status        0x%08x\n"
 310                                        "    Interrupt status enable 0x%08x\n"
 311                                        "    Interrupt signal enable 0x%08x\n"
 312                                        "    Present status          0x%08x\n",
 313                                        __func__, mask,
 314                                        readl(&priv->reg->norintstsen),
 315                                        readl(&priv->reg->norintsigen),
 316                                        readl(&priv->reg->prnsts));
 317                                 return -1;
 318                         }
 319                 }
 320                 writel(mask, &priv->reg->norintsts);
 321         }
 322
 323         udelay(1000);
 324         return 0;
 325 }
 326
 327 static int tegra_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 328                               struct mmc_data *data)
 329 {
 330         void *buf;
 331         unsigned int bbflags;
 332         size_t len;
 333         struct bounce_buffer bbstate;
 334         int ret;
 335
 336         if (data) {
 337                 if (data->flags & MMC_DATA_READ) {
 338                         buf = data->dest;
 339                         bbflags = GEN_BB_WRITE;
 340                 } else {
 341                         buf = (void *)data->src;
 342                         bbflags = GEN_BB_READ;
 343                 }
 344                 len = data->blocks * data->blocksize;
 345
 346                 bounce_buffer_start(&bbstate, buf, len, bbflags);
 347         }
 348
 349         ret = tegra_mmc_send_cmd_bounced(mmc, cmd, data, &bbstate);
 350
 351         if (data)
 352                 bounce_buffer_stop(&bbstate);
 353
 354         return ret;
 355 }
 356
 357 static void tegra_mmc_change_clock(struct tegra_mmc_priv *priv, uint clock)
 358 {
 359         ulong rate;
 360         int div;
 361         unsigned short clk;
 362         unsigned long timeout;
 363
 364         debug(" mmc_change_clock called\n");
 365
 366         /*
 367          * Change Tegra SDMMCx clock divisor here. Source is PLLP_OUT0
 368          */
 369         if (clock == 0)
 370                 goto out;
 371
 372         rate = clk_set_rate(&priv->clk, clock);
 373         div = (rate + clock - 1) / clock;
 374         debug("div = %d\n", div);
 375
 376         writew(0, &priv->reg->clkcon);
 377
 378         /*
 379          * CLKCON
 380          * SELFREQ[15:8]        : base clock divided by value
 381          * ENSDCLK[2]           : SD Clock Enable
 382          * STBLINTCLK[1]        : Internal Clock Stable
 383          * ENINTCLK[0]          : Internal Clock Enable
 384          */
 385         div >>= 1;
 386         clk = ((div << TEGRA_MMC_CLKCON_SDCLK_FREQ_SEL_SHIFT) |
 387                TEGRA_MMC_CLKCON_INTERNAL_CLOCK_ENABLE);
 388         writew(clk, &priv->reg->clkcon);
 389
 390         /* Wait max 10 ms */
 391         timeout = 10;
 392         while (!(readw(&priv->reg->clkcon) &
 393                  TEGRA_MMC_CLKCON_INTERNAL_CLOCK_STABLE)) {
 394                 if (timeout == 0) {
 395                         printf("%s: timeout error\n", __func__);
 396                         return;
 397                 }
 398                 timeout--;
 399                 udelay(1000);
 400         }
 401
 402         clk |= TEGRA_MMC_CLKCON_SD_CLOCK_ENABLE;
 403         writew(clk, &priv->reg->clkcon);
 404
 405         debug("mmc_change_clock: clkcon = %08X\n", clk);
 406
 407 out:
 408         priv->clock = clock;
 409 }
 410
 411 static int tegra_mmc_set_ios(struct mmc *mmc)
 412 {
 413         struct tegra_mmc_priv *priv = mmc->priv;
 414         unsigned char ctrl;
 415         debug(" mmc_set_ios called\n");
 416
 417         debug("bus_width: %x, clock: %d\n", mmc->bus_width, mmc->clock);
 418
 419         /* Change clock first */
 420         tegra_mmc_change_clock(priv, mmc->clock);
 421
 422         ctrl = readb(&priv->reg->hostctl);
 423
 424         /*
 425          * WIDE8[5]
 426          * 0 = Depend on WIDE4
 427          * 1 = 8-bit mode
 428          * WIDE4[1]
 429          * 1 = 4-bit mode
 430          * 0 = 1-bit mode
 431          */
 432         if (mmc->bus_width == 8)
 433                 ctrl |= (1 << 5);
 434         else if (mmc->bus_width == 4)
 435                 ctrl |= (1 << 1);
 436         else
 437                 ctrl &= ~(1 << 1);
 438
 439         writeb(ctrl, &priv->reg->hostctl);
 440         debug("mmc_set_ios: hostctl = %08X\n", ctrl);
 441
 442         return 0;
 443 }
 444
 445 static void tegra_mmc_pad_init(struct tegra_mmc_priv *priv)
 446 {
 447 #if defined(CONFIG_TEGRA30)
 448         u32 val;
 449
 450         debug("%s: sdmmc address = %08x\n", __func__, (unsigned int)priv->reg);
 451
 452         /* Set the pad drive strength for SDMMC1 or 3 only */
 453         if (priv->reg != (void *)0x78000000 &&
 454             priv->reg != (void *)0x78000400) {
 455                 debug("%s: settings are only valid for SDMMC1/SDMMC3!\n",
 456                       __func__);
 457                 return;
 458         }
 459
 460         val = readl(&priv->reg->sdmemcmppadctl);
 461         val &= 0xFFFFFFF0;
 462         val |= MEMCOMP_PADCTRL_VREF;
 463         writel(val, &priv->reg->sdmemcmppadctl);
 464
 465         val = readl(&priv->reg->autocalcfg);
 466         val &= 0xFFFF0000;
 467         val |= AUTO_CAL_PU_OFFSET | AUTO_CAL_PD_OFFSET | AUTO_CAL_ENABLED;
 468         writel(val, &priv->reg->autocalcfg);
 469 #endif
 470 }
 471
 472 static void tegra_mmc_reset(struct tegra_mmc_priv *priv, struct mmc *mmc)
 473 {
 474         unsigned int timeout;
 475         debug(" mmc_reset called\n");
 476
 477         /*
 478          * RSTALL[0] : Software reset for all
 479          * 1 = reset
 480          * 0 = work
 481          */
 482         writeb(TEGRA_MMC_SWRST_SW_RESET_FOR_ALL, &priv->reg->swrst);
 483
 484         priv->clock = 0;
 485
 486         /* Wait max 100 ms */
 487         timeout = 100;
 488
 489         /* hw clears the bit when it's done */
 490         while (readb(&priv->reg->swrst) & TEGRA_MMC_SWRST_SW_RESET_FOR_ALL) {
 491                 if (timeout == 0) {
 492                         printf("%s: timeout error\n", __func__);
 493                         return;
 494                 }
 495                 timeout--;
 496                 udelay(1000);
 497         }
 498
 499         /* Set SD bus voltage & enable bus power */
 500         tegra_mmc_set_power(priv, fls(mmc->cfg->voltages) - 1);
 501         debug("%s: power control = %02X, host control = %02X\n", __func__,
 502                 readb(&priv->reg->pwrcon), readb(&priv->reg->hostctl));
 503
 504         /* Make sure SDIO pads are set up */
 505         tegra_mmc_pad_init(priv);
 506 }
 507
 508 static int tegra_mmc_init(struct mmc *mmc)
 509 {
 510         struct tegra_mmc_priv *priv = mmc->priv;
 511         unsigned int mask;
 512         debug(" tegra_mmc_init called\n");
 513
 514         tegra_mmc_reset(priv, mmc);
 515
 516         priv->version = readw(&priv->reg->hcver);
 517         debug("host version = %x\n", priv->version);
 518
 519         /* mask all */
 520         writel(0xffffffff, &priv->reg->norintstsen);
 521         writel(0xffffffff, &priv->reg->norintsigen);
 522
 523         writeb(0xe, &priv->reg->timeoutcon);    /* TMCLK * 2^27 */
 524         /*
 525          * NORMAL Interrupt Status Enable Register init
 526          * [5] ENSTABUFRDRDY : Buffer Read Ready Status Enable
 527          * [4] ENSTABUFWTRDY : Buffer write Ready Status Enable
 528          * [3] ENSTADMAINT   : DMA boundary interrupt
 529          * [1] ENSTASTANSCMPLT : Transfre Complete Status Enable
 530          * [0] ENSTACMDCMPLT : Command Complete Status Enable
 531         */
 532         mask = readl(&priv->reg->norintstsen);
 533         mask &= ~(0xffff);
 534         mask |= (TEGRA_MMC_NORINTSTSEN_CMD_COMPLETE |
 535                  TEGRA_MMC_NORINTSTSEN_XFER_COMPLETE |
 536                  TEGRA_MMC_NORINTSTSEN_DMA_INTERRUPT |
 537                  TEGRA_MMC_NORINTSTSEN_BUFFER_WRITE_READY |
 538                  TEGRA_MMC_NORINTSTSEN_BUFFER_READ_READY);
 539         writel(mask, &priv->reg->norintstsen);
 540
 541         /*
 542          * NORMAL Interrupt Signal Enable Register init
 543          * [1] ENSTACMDCMPLT : Transfer Complete Signal Enable
 544          */
 545         mask = readl(&priv->reg->norintsigen);
 546         mask &= ~(0xffff);
 547         mask |= TEGRA_MMC_NORINTSIGEN_XFER_COMPLETE;
 548         writel(mask, &priv->reg->norintsigen);
 549
 550         return 0;
 551 }
 552
 553 static int tegra_mmc_getcd(struct mmc *mmc)
 554 {
 555         struct tegra_mmc_priv *priv = mmc->priv;
 556
 557         debug("tegra_mmc_getcd called\n");
 558
 559         if (dm_gpio_is_valid(&priv->cd_gpio))
 560                 return dm_gpio_get_value(&priv->cd_gpio);
 561
 562         return 1;
 563 }
 564
 565 static const struct mmc_ops tegra_mmc_ops = {
 566         .send_cmd       = tegra_mmc_send_cmd,
 567         .set_ios        = tegra_mmc_set_ios,
 568         .init           = tegra_mmc_init,
 569         .getcd          = tegra_mmc_getcd,
 570 };
 571
 572 static int tegra_mmc_probe(struct udevice *dev)
 573 {
 574         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 575         struct tegra_mmc_priv *priv = dev_get_priv(dev);
 576         int bus_width, ret;
 577
 578         priv->cfg.name = "Tegra SD/MMC";
 579         priv->cfg.ops = &tegra_mmc_ops;
 580
 581         bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "bus-width",
 582                                    1);
 583
 584         priv->cfg.voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 585         priv->cfg.host_caps = 0;
 586         if (bus_width == 8)
 587                 priv->cfg.host_caps |= MMC_MODE_8BIT;
 588         if (bus_width >= 4)
 589                 priv->cfg.host_caps |= MMC_MODE_4BIT;
 590         priv->cfg.host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 591
 592         /*
 593          * min freq is for card identification, and is the highest
 594          *  low-speed SDIO card frequency (actually 400KHz)
 595          * max freq is highest HS eMMC clock as per the SD/MMC spec
 596          *  (actually 52MHz)
 597          */
 598         priv->cfg.f_min = 375000;
 599         priv->cfg.f_max = 48000000;
 600
 601         priv->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 602
 603         priv->reg = (void *)dev_get_addr(dev);
 604
 605         ret = reset_get_by_name(dev, "sdhci", &priv->reset_ctl);
 606         if (ret) {
 607                 debug("reset_get_by_name() failed: %d\n", ret);
 608                 return ret;
 609         }
 610         ret = clk_get_by_index(dev, 0, &priv->clk);
 611         if (ret) {
 612                 debug("clk_get_by_index() failed: %d\n", ret);
 613                 return ret;
 614         }
 615
 616         ret = reset_assert(&priv->reset_ctl);
 617         if (ret)
 618                 return ret;
 619         ret = clk_enable(&priv->clk);
 620         if (ret)
 621                 return ret;
 622         ret = clk_set_rate(&priv->clk, 20000000);
 623         if (IS_ERR_VALUE(ret))
 624                 return ret;
 625         ret = reset_deassert(&priv->reset_ctl);
 626         if (ret)
 627                 return ret;
 628
 629         /* These GPIOs are optional */
 630         gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
 631                              GPIOD_IS_IN);
 632         gpio_request_by_name(dev, "wp-gpios", 0, &priv->wp_gpio,
 633                              GPIOD_IS_IN);
 634         gpio_request_by_name(dev, "power-gpios", 0,
 635                              &priv->pwr_gpio, GPIOD_IS_OUT);
 636         if (dm_gpio_is_valid(&priv->pwr_gpio))
 637                 dm_gpio_set_value(&priv->pwr_gpio, 1);
 638
 639         priv->mmc = mmc_create(&priv->cfg, priv);
 640         if (priv->mmc == NULL)
 641                 return -1;
 642
 643         priv->mmc->dev = dev;
 644         upriv->mmc = priv->mmc;
 645
 646         return 0;
 647 }
 648
 649 static const struct udevice_id tegra_mmc_ids[] = {
 650         { .compatible = "nvidia,tegra20-sdhci" },
 651         { .compatible = "nvidia,tegra30-sdhci" },
 652         { .compatible = "nvidia,tegra114-sdhci" },
 653         { .compatible = "nvidia,tegra124-sdhci" },
 654         { .compatible = "nvidia,tegra210-sdhci" },
 655         { .compatible = "nvidia,tegra186-sdhci" },
 656         { }
 657 };
 658
 659 U_BOOT_DRIVER(tegra_mmc_drv) = {
 660         .name           = "tegra_mmc",
 661         .id             = UCLASS_MMC,
 662         .of_match       = tegra_mmc_ids,
 663         .probe          = tegra_mmc_probe,
 664         .priv_auto_alloc_size = sizeof(struct tegra_mmc_priv),
 665 };