drivers/mmc/stm32_sdmmc2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   4  * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <dm.h>
  10 #include <fdtdec.h>
  11 #include <linux/libfdt.h>
  12 #include <mmc.h>
  13 #include <reset.h>
  14 #include <asm/io.h>
  15 #include <asm/gpio.h>
  16 #include <linux/iopoll.h>
  17 #include <watchdog.h>
  18
  19 struct stm32_sdmmc2_plat {
  20         struct mmc_config cfg;
  21         struct mmc mmc;
  22 };
  23
  24 struct stm32_sdmmc2_priv {
  25         fdt_addr_t base;
  26         struct clk clk;
  27         struct reset_ctl reset_ctl;
  28         struct gpio_desc cd_gpio;
  29         u32 clk_reg_msk;
  30         u32 pwr_reg_msk;
  31 };
  32
  33 struct stm32_sdmmc2_ctx {
  34         u32 cache_start;
  35         u32 cache_end;
  36         u32 data_length;
  37         bool dpsm_abort;
  38 };
  39
  40 /* SDMMC REGISTERS OFFSET */
  41 #define SDMMC_POWER             0x00    /* SDMMC power control             */
  42 #define SDMMC_CLKCR             0x04    /* SDMMC clock control             */
  43 #define SDMMC_ARG               0x08    /* SDMMC argument                  */
  44 #define SDMMC_CMD               0x0C    /* SDMMC command                   */
  45 #define SDMMC_RESP1             0x14    /* SDMMC response 1                */
  46 #define SDMMC_RESP2             0x18    /* SDMMC response 2                */
  47 #define SDMMC_RESP3             0x1C    /* SDMMC response 3                */
  48 #define SDMMC_RESP4             0x20    /* SDMMC response 4                */
  49 #define SDMMC_DTIMER            0x24    /* SDMMC data timer                */
  50 #define SDMMC_DLEN              0x28    /* SDMMC data length               */
  51 #define SDMMC_DCTRL             0x2C    /* SDMMC data control              */
  52 #define SDMMC_DCOUNT            0x30    /* SDMMC data counter              */
  53 #define SDMMC_STA               0x34    /* SDMMC status                    */
  54 #define SDMMC_ICR               0x38    /* SDMMC interrupt clear           */
  55 #define SDMMC_MASK              0x3C    /* SDMMC mask                      */
  56 #define SDMMC_IDMACTRL          0x50    /* SDMMC DMA control               */
  57 #define SDMMC_IDMABASE0         0x58    /* SDMMC DMA buffer 0 base address */
  58
  59 /* SDMMC_POWER register */
  60 #define SDMMC_POWER_PWRCTRL_MASK        GENMASK(1, 0)
  61 #define SDMMC_POWER_PWRCTRL_OFF         0
  62 #define SDMMC_POWER_PWRCTRL_CYCLE       2
  63 #define SDMMC_POWER_PWRCTRL_ON          3
  64 #define SDMMC_POWER_VSWITCH             BIT(2)
  65 #define SDMMC_POWER_VSWITCHEN           BIT(3)
  66 #define SDMMC_POWER_DIRPOL              BIT(4)
  67
  68 /* SDMMC_CLKCR register */
  69 #define SDMMC_CLKCR_CLKDIV              GENMASK(9, 0)
  70 #define SDMMC_CLKCR_CLKDIV_MAX          SDMMC_CLKCR_CLKDIV
  71 #define SDMMC_CLKCR_PWRSAV              BIT(12)
  72 #define SDMMC_CLKCR_WIDBUS_4            BIT(14)
  73 #define SDMMC_CLKCR_WIDBUS_8            BIT(15)
  74 #define SDMMC_CLKCR_NEGEDGE             BIT(16)
  75 #define SDMMC_CLKCR_HWFC_EN             BIT(17)
  76 #define SDMMC_CLKCR_DDR                 BIT(18)
  77 #define SDMMC_CLKCR_BUSSPEED            BIT(19)
  78 #define SDMMC_CLKCR_SELCLKRX_MASK       GENMASK(21, 20)
  79 #define SDMMC_CLKCR_SELCLKRX_CK         0
  80 #define SDMMC_CLKCR_SELCLKRX_CKIN       BIT(20)
  81 #define SDMMC_CLKCR_SELCLKRX_FBCK       BIT(21)
  82
  83 /* SDMMC_CMD register */
  84 #define SDMMC_CMD_CMDINDEX              GENMASK(5, 0)
  85 #define SDMMC_CMD_CMDTRANS              BIT(6)
  86 #define SDMMC_CMD_CMDSTOP               BIT(7)
  87 #define SDMMC_CMD_WAITRESP              GENMASK(9, 8)
  88 #define SDMMC_CMD_WAITRESP_0            BIT(8)
  89 #define SDMMC_CMD_WAITRESP_1            BIT(9)
  90 #define SDMMC_CMD_WAITINT               BIT(10)
  91 #define SDMMC_CMD_WAITPEND              BIT(11)
  92 #define SDMMC_CMD_CPSMEN                BIT(12)
  93 #define SDMMC_CMD_DTHOLD                BIT(13)
  94 #define SDMMC_CMD_BOOTMODE              BIT(14)
  95 #define SDMMC_CMD_BOOTEN                BIT(15)
  96 #define SDMMC_CMD_CMDSUSPEND            BIT(16)
  97
  98 /* SDMMC_DCTRL register */
  99 #define SDMMC_DCTRL_DTEN                BIT(0)
 100 #define SDMMC_DCTRL_DTDIR               BIT(1)
 101 #define SDMMC_DCTRL_DTMODE              GENMASK(3, 2)
 102 #define SDMMC_DCTRL_DBLOCKSIZE          GENMASK(7, 4)
 103 #define SDMMC_DCTRL_DBLOCKSIZE_SHIFT    4
 104 #define SDMMC_DCTRL_RWSTART             BIT(8)
 105 #define SDMMC_DCTRL_RWSTOP              BIT(9)
 106 #define SDMMC_DCTRL_RWMOD               BIT(10)
 107 #define SDMMC_DCTRL_SDMMCEN             BIT(11)
 108 #define SDMMC_DCTRL_BOOTACKEN           BIT(12)
 109 #define SDMMC_DCTRL_FIFORST             BIT(13)
 110
 111 /* SDMMC_STA register */
 112 #define SDMMC_STA_CCRCFAIL              BIT(0)
 113 #define SDMMC_STA_DCRCFAIL              BIT(1)
 114 #define SDMMC_STA_CTIMEOUT              BIT(2)
 115 #define SDMMC_STA_DTIMEOUT              BIT(3)
 116 #define SDMMC_STA_TXUNDERR              BIT(4)
 117 #define SDMMC_STA_RXOVERR               BIT(5)
 118 #define SDMMC_STA_CMDREND               BIT(6)
 119 #define SDMMC_STA_CMDSENT               BIT(7)
 120 #define SDMMC_STA_DATAEND               BIT(8)
 121 #define SDMMC_STA_DHOLD                 BIT(9)
 122 #define SDMMC_STA_DBCKEND               BIT(10)
 123 #define SDMMC_STA_DABORT                BIT(11)
 124 #define SDMMC_STA_DPSMACT               BIT(12)
 125 #define SDMMC_STA_CPSMACT               BIT(13)
 126 #define SDMMC_STA_TXFIFOHE              BIT(14)
 127 #define SDMMC_STA_RXFIFOHF              BIT(15)
 128 #define SDMMC_STA_TXFIFOF               BIT(16)
 129 #define SDMMC_STA_RXFIFOF               BIT(17)
 130 #define SDMMC_STA_TXFIFOE               BIT(18)
 131 #define SDMMC_STA_RXFIFOE               BIT(19)
 132 #define SDMMC_STA_BUSYD0                BIT(20)
 133 #define SDMMC_STA_BUSYD0END             BIT(21)
 134 #define SDMMC_STA_SDMMCIT               BIT(22)
 135 #define SDMMC_STA_ACKFAIL               BIT(23)
 136 #define SDMMC_STA_ACKTIMEOUT            BIT(24)
 137 #define SDMMC_STA_VSWEND                BIT(25)
 138 #define SDMMC_STA_CKSTOP                BIT(26)
 139 #define SDMMC_STA_IDMATE                BIT(27)
 140 #define SDMMC_STA_IDMABTC               BIT(28)
 141
 142 /* SDMMC_ICR register */
 143 #define SDMMC_ICR_CCRCFAILC             BIT(0)
 144 #define SDMMC_ICR_DCRCFAILC             BIT(1)
 145 #define SDMMC_ICR_CTIMEOUTC             BIT(2)
 146 #define SDMMC_ICR_DTIMEOUTC             BIT(3)
 147 #define SDMMC_ICR_TXUNDERRC             BIT(4)
 148 #define SDMMC_ICR_RXOVERRC              BIT(5)
 149 #define SDMMC_ICR_CMDRENDC              BIT(6)
 150 #define SDMMC_ICR_CMDSENTC              BIT(7)
 151 #define SDMMC_ICR_DATAENDC              BIT(8)
 152 #define SDMMC_ICR_DHOLDC                BIT(9)
 153 #define SDMMC_ICR_DBCKENDC              BIT(10)
 154 #define SDMMC_ICR_DABORTC               BIT(11)
 155 #define SDMMC_ICR_BUSYD0ENDC            BIT(21)
 156 #define SDMMC_ICR_SDMMCITC              BIT(22)
 157 #define SDMMC_ICR_ACKFAILC              BIT(23)
 158 #define SDMMC_ICR_ACKTIMEOUTC           BIT(24)
 159 #define SDMMC_ICR_VSWENDC               BIT(25)
 160 #define SDMMC_ICR_CKSTOPC               BIT(26)
 161 #define SDMMC_ICR_IDMATEC               BIT(27)
 162 #define SDMMC_ICR_IDMABTCC              BIT(28)
 163 #define SDMMC_ICR_STATIC_FLAGS          ((GENMASK(28, 21)) | (GENMASK(11, 0)))
 164
 165 /* SDMMC_MASK register */
 166 #define SDMMC_MASK_CCRCFAILIE           BIT(0)
 167 #define SDMMC_MASK_DCRCFAILIE           BIT(1)
 168 #define SDMMC_MASK_CTIMEOUTIE           BIT(2)
 169 #define SDMMC_MASK_DTIMEOUTIE           BIT(3)
 170 #define SDMMC_MASK_TXUNDERRIE           BIT(4)
 171 #define SDMMC_MASK_RXOVERRIE            BIT(5)
 172 #define SDMMC_MASK_CMDRENDIE            BIT(6)
 173 #define SDMMC_MASK_CMDSENTIE            BIT(7)
 174 #define SDMMC_MASK_DATAENDIE            BIT(8)
 175 #define SDMMC_MASK_DHOLDIE              BIT(9)
 176 #define SDMMC_MASK_DBCKENDIE            BIT(10)
 177 #define SDMMC_MASK_DABORTIE             BIT(11)
 178 #define SDMMC_MASK_TXFIFOHEIE           BIT(14)
 179 #define SDMMC_MASK_RXFIFOHFIE           BIT(15)
 180 #define SDMMC_MASK_RXFIFOFIE            BIT(17)
 181 #define SDMMC_MASK_TXFIFOEIE            BIT(18)
 182 #define SDMMC_MASK_BUSYD0ENDIE          BIT(21)
 183 #define SDMMC_MASK_SDMMCITIE            BIT(22)
 184 #define SDMMC_MASK_ACKFAILIE            BIT(23)
 185 #define SDMMC_MASK_ACKTIMEOUTIE         BIT(24)
 186 #define SDMMC_MASK_VSWENDIE             BIT(25)
 187 #define SDMMC_MASK_CKSTOPIE             BIT(26)
 188 #define SDMMC_MASK_IDMABTCIE            BIT(28)
 189
 190 /* SDMMC_IDMACTRL register */
 191 #define SDMMC_IDMACTRL_IDMAEN           BIT(0)
 192
 193 #define SDMMC_CMD_TIMEOUT               0xFFFFFFFF
 194 #define SDMMC_BUSYD0END_TIMEOUT_US      2000000
 195
 196 static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv,
 197                                     struct mmc_data *data,
 198                                     struct stm32_sdmmc2_ctx *ctx)
 199 {
 200         u32 data_ctrl, idmabase0;
 201
 202         /* Configure the SDMMC DPSM (Data Path State Machine) */
 203         data_ctrl = (__ilog2(data->blocksize) <<
 204                      SDMMC_DCTRL_DBLOCKSIZE_SHIFT) &
 205                     SDMMC_DCTRL_DBLOCKSIZE;
 206
 207         if (data->flags & MMC_DATA_READ) {
 208                 data_ctrl |= SDMMC_DCTRL_DTDIR;
 209                 idmabase0 = (u32)data->dest;
 210         } else {
 211                 idmabase0 = (u32)data->src;
 212         }
 213
 214         /* Set the SDMMC DataLength value */
 215         writel(ctx->data_length, priv->base + SDMMC_DLEN);
 216
 217         /* Write to SDMMC DCTRL */
 218         writel(data_ctrl, priv->base + SDMMC_DCTRL);
 219
 220         /* Cache align */
 221         ctx->cache_start = rounddown(idmabase0, ARCH_DMA_MINALIGN);
 222         ctx->cache_end = roundup(idmabase0 + ctx->data_length,
 223                                  ARCH_DMA_MINALIGN);
 224
 225         /*
 226          * Flush data cache before DMA start (clean and invalidate)
 227          * Clean also needed for read
 228          * Avoid issue on buffer not cached-aligned
 229          */
 230         flush_dcache_range(ctx->cache_start, ctx->cache_end);
 231
 232         /* Enable internal DMA */
 233         writel(idmabase0, priv->base + SDMMC_IDMABASE0);
 234         writel(SDMMC_IDMACTRL_IDMAEN, priv->base + SDMMC_IDMACTRL);
 235 }
 236
 237 static void stm32_sdmmc2_start_cmd(struct stm32_sdmmc2_priv *priv,
 238                                    struct mmc_cmd *cmd, u32 cmd_param,
 239                                    struct stm32_sdmmc2_ctx *ctx)
 240 {
 241         u32 timeout = 0;
 242
 243         if (readl(priv->base + SDMMC_CMD) & SDMMC_CMD_CPSMEN)
 244                 writel(0, priv->base + SDMMC_CMD);
 245
 246         cmd_param |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
 247         if (cmd->resp_type & MMC_RSP_PRESENT) {
 248                 if (cmd->resp_type & MMC_RSP_136)
 249                         cmd_param |= SDMMC_CMD_WAITRESP;
 250                 else if (cmd->resp_type & MMC_RSP_CRC)
 251                         cmd_param |= SDMMC_CMD_WAITRESP_0;
 252                 else
 253                         cmd_param |= SDMMC_CMD_WAITRESP_1;
 254         }
 255
 256         /*
 257          * SDMMC_DTIME must be set in two case:
 258          * - on data transfert.
 259          * - on busy request.
 260          * If not done or too short, the dtimeout flag occurs and DPSM stays
 261          * enabled/busy and waits for abort (stop transmission cmd).
 262          * Next data command is not possible whereas DPSM is activated.
 263          */
 264         if (ctx->data_length) {
 265                 timeout = SDMMC_CMD_TIMEOUT;
 266         } else {
 267                 writel(0, priv->base + SDMMC_DCTRL);
 268
 269                 if (cmd->resp_type & MMC_RSP_BUSY)
 270                         timeout = SDMMC_CMD_TIMEOUT;
 271         }
 272
 273         /* Set the SDMMC Data TimeOut value */
 274         writel(timeout, priv->base + SDMMC_DTIMER);
 275
 276         /* Clear flags */
 277         writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 278
 279         /* Set SDMMC argument value */
 280         writel(cmd->cmdarg, priv->base + SDMMC_ARG);
 281
 282         /* Set SDMMC command parameters */
 283         writel(cmd_param, priv->base + SDMMC_CMD);
 284 }
 285
 286 static int stm32_sdmmc2_end_cmd(struct stm32_sdmmc2_priv *priv,
 287                                 struct mmc_cmd *cmd,
 288                                 struct stm32_sdmmc2_ctx *ctx)
 289 {
 290         u32 mask = SDMMC_STA_CTIMEOUT;
 291         u32 status;
 292         int ret;
 293
 294         if (cmd->resp_type & MMC_RSP_PRESENT) {
 295                 mask |= SDMMC_STA_CMDREND;
 296                 if (cmd->resp_type & MMC_RSP_CRC)
 297                         mask |= SDMMC_STA_CCRCFAIL;
 298         } else {
 299                 mask |= SDMMC_STA_CMDSENT;
 300         }
 301
 302         /* Polling status register */
 303         ret = readl_poll_timeout(priv->base + SDMMC_STA, status, status & mask,
 304                                  10000);
 305
 306         if (ret < 0) {
 307                 debug("%s: timeout reading SDMMC_STA register\n", __func__);
 308                 ctx->dpsm_abort = true;
 309                 return ret;
 310         }
 311
 312         /* Check status */
 313         if (status & SDMMC_STA_CTIMEOUT) {
 314                 debug("%s: error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
 315                       __func__, status, cmd->cmdidx);
 316                 ctx->dpsm_abort = true;
 317                 return -ETIMEDOUT;
 318         }
 319
 320         if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
 321                 debug("%s: error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
 322                       __func__, status, cmd->cmdidx);
 323                 ctx->dpsm_abort = true;
 324                 return -EILSEQ;
 325         }
 326
 327         if (status & SDMMC_STA_CMDREND && cmd->resp_type & MMC_RSP_PRESENT) {
 328                 cmd->response[0] = readl(priv->base + SDMMC_RESP1);
 329                 if (cmd->resp_type & MMC_RSP_136) {
 330                         cmd->response[1] = readl(priv->base + SDMMC_RESP2);
 331                         cmd->response[2] = readl(priv->base + SDMMC_RESP3);
 332                         cmd->response[3] = readl(priv->base + SDMMC_RESP4);
 333                 }
 334
 335                 /* Wait for BUSYD0END flag if busy status is detected */
 336                 if (cmd->resp_type & MMC_RSP_BUSY &&
 337                     status & SDMMC_STA_BUSYD0) {
 338                         mask = SDMMC_STA_DTIMEOUT | SDMMC_STA_BUSYD0END;
 339
 340                         /* Polling status register */
 341                         ret = readl_poll_timeout(priv->base + SDMMC_STA,
 342                                                  status, status & mask,
 343                                                  SDMMC_BUSYD0END_TIMEOUT_US);
 344
 345                         if (ret < 0) {
 346                                 debug("%s: timeout reading SDMMC_STA\n",
 347                                       __func__);
 348                                 ctx->dpsm_abort = true;
 349                                 return ret;
 350                         }
 351
 352                         if (status & SDMMC_STA_DTIMEOUT) {
 353                                 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x)\n",
 354                                       __func__, status);
 355                                 ctx->dpsm_abort = true;
 356                                 return -ETIMEDOUT;
 357                         }
 358                 }
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int stm32_sdmmc2_end_data(struct stm32_sdmmc2_priv *priv,
 365                                  struct mmc_cmd *cmd,
 366                                  struct mmc_data *data,
 367                                  struct stm32_sdmmc2_ctx *ctx)
 368 {
 369         u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
 370                    SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
 371         u32 status;
 372
 373         if (data->flags & MMC_DATA_READ)
 374                 mask |= SDMMC_STA_RXOVERR;
 375         else
 376                 mask |= SDMMC_STA_TXUNDERR;
 377
 378         status = readl(priv->base + SDMMC_STA);
 379         while (!(status & mask))
 380                 status = readl(priv->base + SDMMC_STA);
 381
 382         /*
 383          * Need invalidate the dcache again to avoid any
 384          * cache-refill during the DMA operations (pre-fetching)
 385          */
 386         if (data->flags & MMC_DATA_READ)
 387                 invalidate_dcache_range(ctx->cache_start, ctx->cache_end);
 388
 389         if (status & SDMMC_STA_DCRCFAIL) {
 390                 debug("%s: error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
 391                       __func__, status, cmd->cmdidx);
 392                 if (readl(priv->base + SDMMC_DCOUNT))
 393                         ctx->dpsm_abort = true;
 394                 return -EILSEQ;
 395         }
 396
 397         if (status & SDMMC_STA_DTIMEOUT) {
 398                 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
 399                       __func__, status, cmd->cmdidx);
 400                 ctx->dpsm_abort = true;
 401                 return -ETIMEDOUT;
 402         }
 403
 404         if (status & SDMMC_STA_TXUNDERR) {
 405                 debug("%s: error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
 406                       __func__, status, cmd->cmdidx);
 407                 ctx->dpsm_abort = true;
 408                 return -EIO;
 409         }
 410
 411         if (status & SDMMC_STA_RXOVERR) {
 412                 debug("%s: error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
 413                       __func__, status, cmd->cmdidx);
 414                 ctx->dpsm_abort = true;
 415                 return -EIO;
 416         }
 417
 418         if (status & SDMMC_STA_IDMATE) {
 419                 debug("%s: error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
 420                       __func__, status, cmd->cmdidx);
 421                 ctx->dpsm_abort = true;
 422                 return -EIO;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int stm32_sdmmc2_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 429                                  struct mmc_data *data)
 430 {
 431         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 432         struct stm32_sdmmc2_ctx ctx;
 433         u32 cmdat = data ? SDMMC_CMD_CMDTRANS : 0;
 434         int ret, retry = 3;
 435
 436         WATCHDOG_RESET();
 437
 438 retry_cmd:
 439         ctx.data_length = 0;
 440         ctx.dpsm_abort = false;
 441
 442         if (data) {
 443                 ctx.data_length = data->blocks * data->blocksize;
 444                 stm32_sdmmc2_start_data(priv, data, &ctx);
 445         }
 446
 447         stm32_sdmmc2_start_cmd(priv, cmd, cmdat, &ctx);
 448
 449         debug("%s: send cmd %d data: 0x%x @ 0x%x\n",
 450               __func__, cmd->cmdidx,
 451               data ? ctx.data_length : 0, (unsigned int)data);
 452
 453         ret = stm32_sdmmc2_end_cmd(priv, cmd, &ctx);
 454
 455         if (data && !ret)
 456                 ret = stm32_sdmmc2_end_data(priv, cmd, data, &ctx);
 457
 458         /* Clear flags */
 459         writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 460         if (data)
 461                 writel(0x0, priv->base + SDMMC_IDMACTRL);
 462
 463         /*
 464          * To stop Data Path State Machine, a stop_transmission command
 465          * shall be send on cmd or data errors.
 466          */
 467         if (ctx.dpsm_abort && (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {
 468                 struct mmc_cmd stop_cmd;
 469
 470                 stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
 471                 stop_cmd.cmdarg = 0;
 472                 stop_cmd.resp_type = MMC_RSP_R1b;
 473
 474                 debug("%s: send STOP command to abort dpsm treatments\n",
 475                       __func__);
 476
 477                 ctx.data_length = 0;
 478
 479                 stm32_sdmmc2_start_cmd(priv, &stop_cmd,
 480                                        SDMMC_CMD_CMDSTOP, &ctx);
 481                 stm32_sdmmc2_end_cmd(priv, &stop_cmd, &ctx);
 482
 483                 writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 484         }
 485
 486         if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
 487                 printf("%s: cmd %d failed, retrying ...\n",
 488                        __func__, cmd->cmdidx);
 489                 retry--;
 490                 goto retry_cmd;
 491         }
 492
 493         debug("%s: end for CMD %d, ret = %d\n", __func__, cmd->cmdidx, ret);
 494
 495         return ret;
 496 }
 497
 498 /*
 499  * Reset the SDMMC with the RCC.SDMMCxRST register bit.
 500  * This will reset the SDMMC to the reset state and the CPSM and DPSM
 501  * to the Idle state. SDMMC is disabled, Signals Hiz.
 502  */
 503 static void stm32_sdmmc2_reset(struct stm32_sdmmc2_priv *priv)
 504 {
 505         /* Reset */
 506         reset_assert(&priv->reset_ctl);
 507         udelay(2);
 508         reset_deassert(&priv->reset_ctl);
 509
 510         /* init the needed SDMMC register after reset */
 511         writel(priv->pwr_reg_msk, priv->base + SDMMC_POWER);
 512 }
 513
 514 /*
 515  * Set the SDMMC in power-cycle state.
 516  * This will make that the SDMMC_D[7:0],
 517  * SDMMC_CMD and SDMMC_CK are driven low, to prevent the card from being
 518  * supplied through the signal lines.
 519  */
 520 static void stm32_sdmmc2_pwrcycle(struct stm32_sdmmc2_priv *priv)
 521 {
 522         if ((readl(priv->base + SDMMC_POWER) & SDMMC_POWER_PWRCTRL_MASK) ==
 523             SDMMC_POWER_PWRCTRL_CYCLE)
 524                 return;
 525
 526         stm32_sdmmc2_reset(priv);
 527         writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
 528                priv->base + SDMMC_POWER);
 529 }
 530
 531 /*
 532  * set the SDMMC state Power-on: the card is clocked
 533  * manage the SDMMC state control:
 534  * Reset => Power-Cycle => Power-Off => Power
 535  *    PWRCTRL=10     PWCTRL=00    PWCTRL=11
 536  */
 537 static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv)
 538 {
 539         u32 pwrctrl =
 540                 readl(priv->base + SDMMC_POWER) &  SDMMC_POWER_PWRCTRL_MASK;
 541
 542         if (pwrctrl == SDMMC_POWER_PWRCTRL_ON)
 543                 return;
 544
 545         /* warning: same PWRCTRL value after reset and for power-off state
 546          * it is the reset state here = the only managed by the driver
 547          */
 548         if (pwrctrl == SDMMC_POWER_PWRCTRL_OFF) {
 549                 writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
 550                        priv->base + SDMMC_POWER);
 551         }
 552
 553         /*
 554          * the remaining case is SDMMC_POWER_PWRCTRL_CYCLE
 555          * switch to Power-Off state: SDMCC disable, signals drive 1
 556          */
 557         writel(SDMMC_POWER_PWRCTRL_OFF | priv->pwr_reg_msk,
 558                priv->base + SDMMC_POWER);
 559
 560         /* After the 1ms delay set the SDMMC to power-on */
 561         mdelay(1);
 562         writel(SDMMC_POWER_PWRCTRL_ON | priv->pwr_reg_msk,
 563                priv->base + SDMMC_POWER);
 564
 565         /* during the first 74 SDMMC_CK cycles the SDMMC is still disabled. */
 566 }
 567
 568 #define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
 569 static int stm32_sdmmc2_set_ios(struct udevice *dev)
 570 {
 571         struct mmc *mmc = mmc_get_mmc_dev(dev);
 572         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 573         u32 desired = mmc->clock;
 574         u32 sys_clock = clk_get_rate(&priv->clk);
 575         u32 clk = 0;
 576
 577         debug("%s: bus_with = %d, clock = %d\n", __func__,
 578               mmc->bus_width, mmc->clock);
 579
 580         if (mmc->clk_disable)
 581                 stm32_sdmmc2_pwrcycle(priv);
 582         else
 583                 stm32_sdmmc2_pwron(priv);
 584
 585         /*
 586          * clk_div = 0 => command and data generated on SDMMCCLK falling edge
 587          * clk_div > 0 and NEGEDGE = 0 => command and data generated on
 588          * SDMMCCLK rising edge
 589          * clk_div > 0 and NEGEDGE = 1 => command and data generated on
 590          * SDMMCCLK falling edge
 591          */
 592         if (desired && ((sys_clock > desired) ||
 593                         IS_RISING_EDGE(priv->clk_reg_msk))) {
 594                 clk = DIV_ROUND_UP(sys_clock, 2 * desired);
 595                 if (clk > SDMMC_CLKCR_CLKDIV_MAX)
 596                         clk = SDMMC_CLKCR_CLKDIV_MAX;
 597         }
 598
 599         if (mmc->bus_width == 4)
 600                 clk |= SDMMC_CLKCR_WIDBUS_4;
 601         if (mmc->bus_width == 8)
 602                 clk |= SDMMC_CLKCR_WIDBUS_8;
 603
 604         writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN,
 605                priv->base + SDMMC_CLKCR);
 606
 607         return 0;
 608 }
 609
 610 static int stm32_sdmmc2_getcd(struct udevice *dev)
 611 {
 612         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 613
 614         debug("stm32_sdmmc2_getcd called\n");
 615
 616         if (dm_gpio_is_valid(&priv->cd_gpio))
 617                 return dm_gpio_get_value(&priv->cd_gpio);
 618
 619         return 1;
 620 }
 621
 622 static const struct dm_mmc_ops stm32_sdmmc2_ops = {
 623         .send_cmd = stm32_sdmmc2_send_cmd,
 624         .set_ios = stm32_sdmmc2_set_ios,
 625         .get_cd = stm32_sdmmc2_getcd,
 626 };
 627
 628 static int stm32_sdmmc2_probe(struct udevice *dev)
 629 {
 630         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 631         struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
 632         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 633         struct mmc_config *cfg = &plat->cfg;
 634         int ret;
 635
 636         priv->base = dev_read_addr(dev);
 637         if (priv->base == FDT_ADDR_T_NONE)
 638                 return -EINVAL;
 639
 640         if (dev_read_bool(dev, "st,neg-edge"))
 641                 priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
 642         if (dev_read_bool(dev, "st,sig-dir"))
 643                 priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
 644         if (dev_read_bool(dev, "st,use-ckin"))
 645                 priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
 646
 647         ret = clk_get_by_index(dev, 0, &priv->clk);
 648         if (ret)
 649                 return ret;
 650
 651         ret = clk_enable(&priv->clk);
 652         if (ret)
 653                 goto clk_free;
 654
 655         ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
 656         if (ret)
 657                 goto clk_disable;
 658
 659         gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
 660                              GPIOD_IS_IN);
 661
 662         cfg->f_min = 400000;
 663         cfg->f_max = dev_read_u32_default(dev, "max-frequency", 52000000);
 664         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 665         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 666         cfg->name = "STM32 SDMMC2";
 667
 668         cfg->host_caps = 0;
 669         if (cfg->f_max > 25000000)
 670                 cfg->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 671
 672         switch (dev_read_u32_default(dev, "bus-width", 1)) {
 673         case 8:
 674                 cfg->host_caps |= MMC_MODE_8BIT;
 675                 /* fall through */
 676         case 4:
 677                 cfg->host_caps |= MMC_MODE_4BIT;
 678                 break;
 679         case 1:
 680                 break;
 681         default:
 682                 pr_err("invalid \"bus-width\" property, force to 1\n");
 683         }
 684
 685         upriv->mmc = &plat->mmc;
 686
 687         /* SDMMC init */
 688         stm32_sdmmc2_reset(priv);
 689         return 0;
 690
 691 clk_disable:
 692         clk_disable(&priv->clk);
 693 clk_free:
 694         clk_free(&priv->clk);
 695
 696         return ret;
 697 }
 698
 699 static int stm32_sdmmc_bind(struct udevice *dev)
 700 {
 701         struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
 702
 703         return mmc_bind(dev, &plat->mmc, &plat->cfg);
 704 }
 705
 706 static const struct udevice_id stm32_sdmmc2_ids[] = {
 707         { .compatible = "st,stm32-sdmmc2" },
 708         { }
 709 };
 710
 711 U_BOOT_DRIVER(stm32_sdmmc2) = {
 712         .name = "stm32_sdmmc2",
 713         .id = UCLASS_MMC,
 714         .of_match = stm32_sdmmc2_ids,
 715         .ops = &stm32_sdmmc2_ops,
 716         .probe = stm32_sdmmc2_probe,
 717         .bind = stm32_sdmmc_bind,
 718         .priv_auto_alloc_size = sizeof(struct stm32_sdmmc2_priv),
 719         .platdata_auto_alloc_size = sizeof(struct stm32_sdmmc2_plat),
 720 };