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@foss.st.com> for STMicroelectronics.
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <cpu_func.h>
  10 #include <dm.h>
  11 #include <fdtdec.h>
  12 #include <log.h>
  13 #include <malloc.h>
  14 #include <asm/bitops.h>
  15 #include <asm/cache.h>
  16 #include <linux/bitops.h>
  17 #include <linux/delay.h>
  18 #include <linux/libfdt.h>
  19 #include <mmc.h>
  20 #include <reset.h>
  21 #include <asm/io.h>
  22 #include <asm/gpio.h>
  23 #include <linux/iopoll.h>
  24 #include <watchdog.h>
  25
  26 struct stm32_sdmmc2_plat {
  27         struct mmc_config cfg;
  28         struct mmc mmc;
  29 };
  30
  31 struct stm32_sdmmc2_priv {
  32         fdt_addr_t base;
  33         struct clk clk;
  34         struct reset_ctl reset_ctl;
  35         struct gpio_desc cd_gpio;
  36         u32 clk_reg_msk;
  37         u32 pwr_reg_msk;
  38 };
  39
  40 struct stm32_sdmmc2_ctx {
  41         u32 cache_start;
  42         u32 cache_end;
  43         u32 data_length;
  44         bool dpsm_abort;
  45 };
  46
  47 /* SDMMC REGISTERS OFFSET */
  48 #define SDMMC_POWER             0x00    /* SDMMC power control             */
  49 #define SDMMC_CLKCR             0x04    /* SDMMC clock control             */
  50 #define SDMMC_ARG               0x08    /* SDMMC argument                  */
  51 #define SDMMC_CMD               0x0C    /* SDMMC command                   */
  52 #define SDMMC_RESP1             0x14    /* SDMMC response 1                */
  53 #define SDMMC_RESP2             0x18    /* SDMMC response 2                */
  54 #define SDMMC_RESP3             0x1C    /* SDMMC response 3                */
  55 #define SDMMC_RESP4             0x20    /* SDMMC response 4                */
  56 #define SDMMC_DTIMER            0x24    /* SDMMC data timer                */
  57 #define SDMMC_DLEN              0x28    /* SDMMC data length               */
  58 #define SDMMC_DCTRL             0x2C    /* SDMMC data control              */
  59 #define SDMMC_DCOUNT            0x30    /* SDMMC data counter              */
  60 #define SDMMC_STA               0x34    /* SDMMC status                    */
  61 #define SDMMC_ICR               0x38    /* SDMMC interrupt clear           */
  62 #define SDMMC_MASK              0x3C    /* SDMMC mask                      */
  63 #define SDMMC_IDMACTRL          0x50    /* SDMMC DMA control               */
  64 #define SDMMC_IDMABASE0         0x58    /* SDMMC DMA buffer 0 base address */
  65
  66 /* SDMMC_POWER register */
  67 #define SDMMC_POWER_PWRCTRL_MASK        GENMASK(1, 0)
  68 #define SDMMC_POWER_PWRCTRL_OFF         0
  69 #define SDMMC_POWER_PWRCTRL_CYCLE       2
  70 #define SDMMC_POWER_PWRCTRL_ON          3
  71 #define SDMMC_POWER_VSWITCH             BIT(2)
  72 #define SDMMC_POWER_VSWITCHEN           BIT(3)
  73 #define SDMMC_POWER_DIRPOL              BIT(4)
  74
  75 /* SDMMC_CLKCR register */
  76 #define SDMMC_CLKCR_CLKDIV              GENMASK(9, 0)
  77 #define SDMMC_CLKCR_CLKDIV_MAX          SDMMC_CLKCR_CLKDIV
  78 #define SDMMC_CLKCR_PWRSAV              BIT(12)
  79 #define SDMMC_CLKCR_WIDBUS_4            BIT(14)
  80 #define SDMMC_CLKCR_WIDBUS_8            BIT(15)
  81 #define SDMMC_CLKCR_NEGEDGE             BIT(16)
  82 #define SDMMC_CLKCR_HWFC_EN             BIT(17)
  83 #define SDMMC_CLKCR_DDR                 BIT(18)
  84 #define SDMMC_CLKCR_BUSSPEED            BIT(19)
  85 #define SDMMC_CLKCR_SELCLKRX_MASK       GENMASK(21, 20)
  86 #define SDMMC_CLKCR_SELCLKRX_CK         0
  87 #define SDMMC_CLKCR_SELCLKRX_CKIN       BIT(20)
  88 #define SDMMC_CLKCR_SELCLKRX_FBCK       BIT(21)
  89
  90 /* SDMMC_CMD register */
  91 #define SDMMC_CMD_CMDINDEX              GENMASK(5, 0)
  92 #define SDMMC_CMD_CMDTRANS              BIT(6)
  93 #define SDMMC_CMD_CMDSTOP               BIT(7)
  94 #define SDMMC_CMD_WAITRESP              GENMASK(9, 8)
  95 #define SDMMC_CMD_WAITRESP_0            BIT(8)
  96 #define SDMMC_CMD_WAITRESP_1            BIT(9)
  97 #define SDMMC_CMD_WAITINT               BIT(10)
  98 #define SDMMC_CMD_WAITPEND              BIT(11)
  99 #define SDMMC_CMD_CPSMEN                BIT(12)
 100 #define SDMMC_CMD_DTHOLD                BIT(13)
 101 #define SDMMC_CMD_BOOTMODE              BIT(14)
 102 #define SDMMC_CMD_BOOTEN                BIT(15)
 103 #define SDMMC_CMD_CMDSUSPEND            BIT(16)
 104
 105 /* SDMMC_DCTRL register */
 106 #define SDMMC_DCTRL_DTEN                BIT(0)
 107 #define SDMMC_DCTRL_DTDIR               BIT(1)
 108 #define SDMMC_DCTRL_DTMODE              GENMASK(3, 2)
 109 #define SDMMC_DCTRL_DBLOCKSIZE          GENMASK(7, 4)
 110 #define SDMMC_DCTRL_DBLOCKSIZE_SHIFT    4
 111 #define SDMMC_DCTRL_RWSTART             BIT(8)
 112 #define SDMMC_DCTRL_RWSTOP              BIT(9)
 113 #define SDMMC_DCTRL_RWMOD               BIT(10)
 114 #define SDMMC_DCTRL_SDMMCEN             BIT(11)
 115 #define SDMMC_DCTRL_BOOTACKEN           BIT(12)
 116 #define SDMMC_DCTRL_FIFORST             BIT(13)
 117
 118 /* SDMMC_STA register */
 119 #define SDMMC_STA_CCRCFAIL              BIT(0)
 120 #define SDMMC_STA_DCRCFAIL              BIT(1)
 121 #define SDMMC_STA_CTIMEOUT              BIT(2)
 122 #define SDMMC_STA_DTIMEOUT              BIT(3)
 123 #define SDMMC_STA_TXUNDERR              BIT(4)
 124 #define SDMMC_STA_RXOVERR               BIT(5)
 125 #define SDMMC_STA_CMDREND               BIT(6)
 126 #define SDMMC_STA_CMDSENT               BIT(7)
 127 #define SDMMC_STA_DATAEND               BIT(8)
 128 #define SDMMC_STA_DHOLD                 BIT(9)
 129 #define SDMMC_STA_DBCKEND               BIT(10)
 130 #define SDMMC_STA_DABORT                BIT(11)
 131 #define SDMMC_STA_DPSMACT               BIT(12)
 132 #define SDMMC_STA_CPSMACT               BIT(13)
 133 #define SDMMC_STA_TXFIFOHE              BIT(14)
 134 #define SDMMC_STA_RXFIFOHF              BIT(15)
 135 #define SDMMC_STA_TXFIFOF               BIT(16)
 136 #define SDMMC_STA_RXFIFOF               BIT(17)
 137 #define SDMMC_STA_TXFIFOE               BIT(18)
 138 #define SDMMC_STA_RXFIFOE               BIT(19)
 139 #define SDMMC_STA_BUSYD0                BIT(20)
 140 #define SDMMC_STA_BUSYD0END             BIT(21)
 141 #define SDMMC_STA_SDMMCIT               BIT(22)
 142 #define SDMMC_STA_ACKFAIL               BIT(23)
 143 #define SDMMC_STA_ACKTIMEOUT            BIT(24)
 144 #define SDMMC_STA_VSWEND                BIT(25)
 145 #define SDMMC_STA_CKSTOP                BIT(26)
 146 #define SDMMC_STA_IDMATE                BIT(27)
 147 #define SDMMC_STA_IDMABTC               BIT(28)
 148
 149 /* SDMMC_ICR register */
 150 #define SDMMC_ICR_CCRCFAILC             BIT(0)
 151 #define SDMMC_ICR_DCRCFAILC             BIT(1)
 152 #define SDMMC_ICR_CTIMEOUTC             BIT(2)
 153 #define SDMMC_ICR_DTIMEOUTC             BIT(3)
 154 #define SDMMC_ICR_TXUNDERRC             BIT(4)
 155 #define SDMMC_ICR_RXOVERRC              BIT(5)
 156 #define SDMMC_ICR_CMDRENDC              BIT(6)
 157 #define SDMMC_ICR_CMDSENTC              BIT(7)
 158 #define SDMMC_ICR_DATAENDC              BIT(8)
 159 #define SDMMC_ICR_DHOLDC                BIT(9)
 160 #define SDMMC_ICR_DBCKENDC              BIT(10)
 161 #define SDMMC_ICR_DABORTC               BIT(11)
 162 #define SDMMC_ICR_BUSYD0ENDC            BIT(21)
 163 #define SDMMC_ICR_SDMMCITC              BIT(22)
 164 #define SDMMC_ICR_ACKFAILC              BIT(23)
 165 #define SDMMC_ICR_ACKTIMEOUTC           BIT(24)
 166 #define SDMMC_ICR_VSWENDC               BIT(25)
 167 #define SDMMC_ICR_CKSTOPC               BIT(26)
 168 #define SDMMC_ICR_IDMATEC               BIT(27)
 169 #define SDMMC_ICR_IDMABTCC              BIT(28)
 170 #define SDMMC_ICR_STATIC_FLAGS          ((GENMASK(28, 21)) | (GENMASK(11, 0)))
 171
 172 /* SDMMC_MASK register */
 173 #define SDMMC_MASK_CCRCFAILIE           BIT(0)
 174 #define SDMMC_MASK_DCRCFAILIE           BIT(1)
 175 #define SDMMC_MASK_CTIMEOUTIE           BIT(2)
 176 #define SDMMC_MASK_DTIMEOUTIE           BIT(3)
 177 #define SDMMC_MASK_TXUNDERRIE           BIT(4)
 178 #define SDMMC_MASK_RXOVERRIE            BIT(5)
 179 #define SDMMC_MASK_CMDRENDIE            BIT(6)
 180 #define SDMMC_MASK_CMDSENTIE            BIT(7)
 181 #define SDMMC_MASK_DATAENDIE            BIT(8)
 182 #define SDMMC_MASK_DHOLDIE              BIT(9)
 183 #define SDMMC_MASK_DBCKENDIE            BIT(10)
 184 #define SDMMC_MASK_DABORTIE             BIT(11)
 185 #define SDMMC_MASK_TXFIFOHEIE           BIT(14)
 186 #define SDMMC_MASK_RXFIFOHFIE           BIT(15)
 187 #define SDMMC_MASK_RXFIFOFIE            BIT(17)
 188 #define SDMMC_MASK_TXFIFOEIE            BIT(18)
 189 #define SDMMC_MASK_BUSYD0ENDIE          BIT(21)
 190 #define SDMMC_MASK_SDMMCITIE            BIT(22)
 191 #define SDMMC_MASK_ACKFAILIE            BIT(23)
 192 #define SDMMC_MASK_ACKTIMEOUTIE         BIT(24)
 193 #define SDMMC_MASK_VSWENDIE             BIT(25)
 194 #define SDMMC_MASK_CKSTOPIE             BIT(26)
 195 #define SDMMC_MASK_IDMABTCIE            BIT(28)
 196
 197 /* SDMMC_IDMACTRL register */
 198 #define SDMMC_IDMACTRL_IDMAEN           BIT(0)
 199
 200 #define SDMMC_CMD_TIMEOUT               0xFFFFFFFF
 201 #define SDMMC_BUSYD0END_TIMEOUT_US      2000000
 202
 203 static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv,
 204                                     struct mmc_data *data,
 205                                     struct stm32_sdmmc2_ctx *ctx)
 206 {
 207         u32 data_ctrl, idmabase0;
 208
 209         /* Configure the SDMMC DPSM (Data Path State Machine) */
 210         data_ctrl = (__ilog2(data->blocksize) <<
 211                      SDMMC_DCTRL_DBLOCKSIZE_SHIFT) &
 212                     SDMMC_DCTRL_DBLOCKSIZE;
 213
 214         if (data->flags & MMC_DATA_READ) {
 215                 data_ctrl |= SDMMC_DCTRL_DTDIR;
 216                 idmabase0 = (u32)data->dest;
 217         } else {
 218                 idmabase0 = (u32)data->src;
 219         }
 220
 221         /* Set the SDMMC DataLength value */
 222         writel(ctx->data_length, priv->base + SDMMC_DLEN);
 223
 224         /* Write to SDMMC DCTRL */
 225         writel(data_ctrl, priv->base + SDMMC_DCTRL);
 226
 227         /* Cache align */
 228         ctx->cache_start = rounddown(idmabase0, ARCH_DMA_MINALIGN);
 229         ctx->cache_end = roundup(idmabase0 + ctx->data_length,
 230                                  ARCH_DMA_MINALIGN);
 231
 232         /*
 233          * Flush data cache before DMA start (clean and invalidate)
 234          * Clean also needed for read
 235          * Avoid issue on buffer not cached-aligned
 236          */
 237         flush_dcache_range(ctx->cache_start, ctx->cache_end);
 238
 239         /* Enable internal DMA */
 240         writel(idmabase0, priv->base + SDMMC_IDMABASE0);
 241         writel(SDMMC_IDMACTRL_IDMAEN, priv->base + SDMMC_IDMACTRL);
 242 }
 243
 244 static void stm32_sdmmc2_start_cmd(struct stm32_sdmmc2_priv *priv,
 245                                    struct mmc_cmd *cmd, u32 cmd_param,
 246                                    struct stm32_sdmmc2_ctx *ctx)
 247 {
 248         u32 timeout = 0;
 249
 250         if (readl(priv->base + SDMMC_CMD) & SDMMC_CMD_CPSMEN)
 251                 writel(0, priv->base + SDMMC_CMD);
 252
 253         cmd_param |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
 254         if (cmd->resp_type & MMC_RSP_PRESENT) {
 255                 if (cmd->resp_type & MMC_RSP_136)
 256                         cmd_param |= SDMMC_CMD_WAITRESP;
 257                 else if (cmd->resp_type & MMC_RSP_CRC)
 258                         cmd_param |= SDMMC_CMD_WAITRESP_0;
 259                 else
 260                         cmd_param |= SDMMC_CMD_WAITRESP_1;
 261         }
 262
 263         /*
 264          * SDMMC_DTIME must be set in two case:
 265          * - on data transfert.
 266          * - on busy request.
 267          * If not done or too short, the dtimeout flag occurs and DPSM stays
 268          * enabled/busy and waits for abort (stop transmission cmd).
 269          * Next data command is not possible whereas DPSM is activated.
 270          */
 271         if (ctx->data_length) {
 272                 timeout = SDMMC_CMD_TIMEOUT;
 273         } else {
 274                 writel(0, priv->base + SDMMC_DCTRL);
 275
 276                 if (cmd->resp_type & MMC_RSP_BUSY)
 277                         timeout = SDMMC_CMD_TIMEOUT;
 278         }
 279
 280         /* Set the SDMMC Data TimeOut value */
 281         writel(timeout, priv->base + SDMMC_DTIMER);
 282
 283         /* Clear flags */
 284         writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 285
 286         /* Set SDMMC argument value */
 287         writel(cmd->cmdarg, priv->base + SDMMC_ARG);
 288
 289         /* Set SDMMC command parameters */
 290         writel(cmd_param, priv->base + SDMMC_CMD);
 291 }
 292
 293 static int stm32_sdmmc2_end_cmd(struct stm32_sdmmc2_priv *priv,
 294                                 struct mmc_cmd *cmd,
 295                                 struct stm32_sdmmc2_ctx *ctx)
 296 {
 297         u32 mask = SDMMC_STA_CTIMEOUT;
 298         u32 status;
 299         int ret;
 300
 301         if (cmd->resp_type & MMC_RSP_PRESENT) {
 302                 mask |= SDMMC_STA_CMDREND;
 303                 if (cmd->resp_type & MMC_RSP_CRC)
 304                         mask |= SDMMC_STA_CCRCFAIL;
 305         } else {
 306                 mask |= SDMMC_STA_CMDSENT;
 307         }
 308
 309         /* Polling status register */
 310         ret = readl_poll_timeout(priv->base + SDMMC_STA, status, status & mask,
 311                                  10000);
 312
 313         if (ret < 0) {
 314                 debug("%s: timeout reading SDMMC_STA register\n", __func__);
 315                 ctx->dpsm_abort = true;
 316                 return ret;
 317         }
 318
 319         /* Check status */
 320         if (status & SDMMC_STA_CTIMEOUT) {
 321                 debug("%s: error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
 322                       __func__, status, cmd->cmdidx);
 323                 ctx->dpsm_abort = true;
 324                 return -ETIMEDOUT;
 325         }
 326
 327         if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
 328                 debug("%s: error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
 329                       __func__, status, cmd->cmdidx);
 330                 ctx->dpsm_abort = true;
 331                 return -EILSEQ;
 332         }
 333
 334         if (status & SDMMC_STA_CMDREND && cmd->resp_type & MMC_RSP_PRESENT) {
 335                 cmd->response[0] = readl(priv->base + SDMMC_RESP1);
 336                 if (cmd->resp_type & MMC_RSP_136) {
 337                         cmd->response[1] = readl(priv->base + SDMMC_RESP2);
 338                         cmd->response[2] = readl(priv->base + SDMMC_RESP3);
 339                         cmd->response[3] = readl(priv->base + SDMMC_RESP4);
 340                 }
 341
 342                 /* Wait for BUSYD0END flag if busy status is detected */
 343                 if (cmd->resp_type & MMC_RSP_BUSY &&
 344                     status & SDMMC_STA_BUSYD0) {
 345                         mask = SDMMC_STA_DTIMEOUT | SDMMC_STA_BUSYD0END;
 346
 347                         /* Polling status register */
 348                         ret = readl_poll_timeout(priv->base + SDMMC_STA,
 349                                                  status, status & mask,
 350                                                  SDMMC_BUSYD0END_TIMEOUT_US);
 351
 352                         if (ret < 0) {
 353                                 debug("%s: timeout reading SDMMC_STA\n",
 354                                       __func__);
 355                                 ctx->dpsm_abort = true;
 356                                 return ret;
 357                         }
 358
 359                         if (status & SDMMC_STA_DTIMEOUT) {
 360                                 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x)\n",
 361                                       __func__, status);
 362                                 ctx->dpsm_abort = true;
 363                                 return -ETIMEDOUT;
 364                         }
 365                 }
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int stm32_sdmmc2_end_data(struct stm32_sdmmc2_priv *priv,
 372                                  struct mmc_cmd *cmd,
 373                                  struct mmc_data *data,
 374                                  struct stm32_sdmmc2_ctx *ctx)
 375 {
 376         u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
 377                    SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
 378         u32 status;
 379
 380         if (data->flags & MMC_DATA_READ)
 381                 mask |= SDMMC_STA_RXOVERR;
 382         else
 383                 mask |= SDMMC_STA_TXUNDERR;
 384
 385         status = readl(priv->base + SDMMC_STA);
 386         while (!(status & mask))
 387                 status = readl(priv->base + SDMMC_STA);
 388
 389         /*
 390          * Need invalidate the dcache again to avoid any
 391          * cache-refill during the DMA operations (pre-fetching)
 392          */
 393         if (data->flags & MMC_DATA_READ)
 394                 invalidate_dcache_range(ctx->cache_start, ctx->cache_end);
 395
 396         if (status & SDMMC_STA_DCRCFAIL) {
 397                 debug("%s: error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
 398                       __func__, status, cmd->cmdidx);
 399                 if (readl(priv->base + SDMMC_DCOUNT))
 400                         ctx->dpsm_abort = true;
 401                 return -EILSEQ;
 402         }
 403
 404         if (status & SDMMC_STA_DTIMEOUT) {
 405                 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
 406                       __func__, status, cmd->cmdidx);
 407                 ctx->dpsm_abort = true;
 408                 return -ETIMEDOUT;
 409         }
 410
 411         if (status & SDMMC_STA_TXUNDERR) {
 412                 debug("%s: error SDMMC_STA_TXUNDERR (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_RXOVERR) {
 419                 debug("%s: error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
 420                       __func__, status, cmd->cmdidx);
 421                 ctx->dpsm_abort = true;
 422                 return -EIO;
 423         }
 424
 425         if (status & SDMMC_STA_IDMATE) {
 426                 debug("%s: error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
 427                       __func__, status, cmd->cmdidx);
 428                 ctx->dpsm_abort = true;
 429                 return -EIO;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int stm32_sdmmc2_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 436                                  struct mmc_data *data)
 437 {
 438         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 439         struct stm32_sdmmc2_ctx ctx;
 440         u32 cmdat = data ? SDMMC_CMD_CMDTRANS : 0;
 441         int ret, retry = 3;
 442
 443         WATCHDOG_RESET();
 444
 445 retry_cmd:
 446         ctx.data_length = 0;
 447         ctx.dpsm_abort = false;
 448
 449         if (data) {
 450                 ctx.data_length = data->blocks * data->blocksize;
 451                 stm32_sdmmc2_start_data(priv, data, &ctx);
 452         }
 453
 454         stm32_sdmmc2_start_cmd(priv, cmd, cmdat, &ctx);
 455
 456         debug("%s: send cmd %d data: 0x%x @ 0x%x\n",
 457               __func__, cmd->cmdidx,
 458               data ? ctx.data_length : 0, (unsigned int)data);
 459
 460         ret = stm32_sdmmc2_end_cmd(priv, cmd, &ctx);
 461
 462         if (data && !ret)
 463                 ret = stm32_sdmmc2_end_data(priv, cmd, data, &ctx);
 464
 465         /* Clear flags */
 466         writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 467         if (data)
 468                 writel(0x0, priv->base + SDMMC_IDMACTRL);
 469
 470         /*
 471          * To stop Data Path State Machine, a stop_transmission command
 472          * shall be send on cmd or data errors.
 473          */
 474         if (ctx.dpsm_abort && (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {
 475                 struct mmc_cmd stop_cmd;
 476
 477                 stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
 478                 stop_cmd.cmdarg = 0;
 479                 stop_cmd.resp_type = MMC_RSP_R1b;
 480
 481                 debug("%s: send STOP command to abort dpsm treatments\n",
 482                       __func__);
 483
 484                 ctx.data_length = 0;
 485
 486                 stm32_sdmmc2_start_cmd(priv, &stop_cmd,
 487                                        SDMMC_CMD_CMDSTOP, &ctx);
 488                 stm32_sdmmc2_end_cmd(priv, &stop_cmd, &ctx);
 489
 490                 writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 491         }
 492
 493         if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
 494                 printf("%s: cmd %d failed, retrying ...\n",
 495                        __func__, cmd->cmdidx);
 496                 retry--;
 497                 goto retry_cmd;
 498         }
 499
 500         debug("%s: end for CMD %d, ret = %d\n", __func__, cmd->cmdidx, ret);
 501
 502         return ret;
 503 }
 504
 505 /*
 506  * Reset the SDMMC with the RCC.SDMMCxRST register bit.
 507  * This will reset the SDMMC to the reset state and the CPSM and DPSM
 508  * to the Idle state. SDMMC is disabled, Signals Hiz.
 509  */
 510 static void stm32_sdmmc2_reset(struct stm32_sdmmc2_priv *priv)
 511 {
 512         /* Reset */
 513         reset_assert(&priv->reset_ctl);
 514         udelay(2);
 515         reset_deassert(&priv->reset_ctl);
 516
 517         /* init the needed SDMMC register after reset */
 518         writel(priv->pwr_reg_msk, priv->base + SDMMC_POWER);
 519 }
 520
 521 /*
 522  * Set the SDMMC in power-cycle state.
 523  * This will make that the SDMMC_D[7:0],
 524  * SDMMC_CMD and SDMMC_CK are driven low, to prevent the card from being
 525  * supplied through the signal lines.
 526  */
 527 static void stm32_sdmmc2_pwrcycle(struct stm32_sdmmc2_priv *priv)
 528 {
 529         if ((readl(priv->base + SDMMC_POWER) & SDMMC_POWER_PWRCTRL_MASK) ==
 530             SDMMC_POWER_PWRCTRL_CYCLE)
 531                 return;
 532
 533         stm32_sdmmc2_reset(priv);
 534 }
 535
 536 /*
 537  * set the SDMMC state Power-on: the card is clocked
 538  * manage the SDMMC state control:
 539  * Reset => Power-Cycle => Power-Off => Power
 540  *    PWRCTRL=10     PWCTRL=00    PWCTRL=11
 541  */
 542 static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv)
 543 {
 544         u32 pwrctrl =
 545                 readl(priv->base + SDMMC_POWER) &  SDMMC_POWER_PWRCTRL_MASK;
 546
 547         if (pwrctrl == SDMMC_POWER_PWRCTRL_ON)
 548                 return;
 549
 550         /* warning: same PWRCTRL value after reset and for power-off state
 551          * it is the reset state here = the only managed by the driver
 552          */
 553         if (pwrctrl == SDMMC_POWER_PWRCTRL_OFF) {
 554                 writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
 555                        priv->base + SDMMC_POWER);
 556         }
 557
 558         /*
 559          * the remaining case is SDMMC_POWER_PWRCTRL_CYCLE
 560          * switch to Power-Off state: SDMCC disable, signals drive 1
 561          */
 562         writel(SDMMC_POWER_PWRCTRL_OFF | priv->pwr_reg_msk,
 563                priv->base + SDMMC_POWER);
 564
 565         /* After the 1ms delay set the SDMMC to power-on */
 566         mdelay(1);
 567         writel(SDMMC_POWER_PWRCTRL_ON | priv->pwr_reg_msk,
 568                priv->base + SDMMC_POWER);
 569
 570         /* during the first 74 SDMMC_CK cycles the SDMMC is still disabled. */
 571 }
 572
 573 #define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
 574 static int stm32_sdmmc2_set_ios(struct udevice *dev)
 575 {
 576         struct mmc *mmc = mmc_get_mmc_dev(dev);
 577         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 578         u32 desired = mmc->clock;
 579         u32 sys_clock = clk_get_rate(&priv->clk);
 580         u32 clk = 0;
 581
 582         debug("%s: bus_with = %d, clock = %d\n", __func__,
 583               mmc->bus_width, mmc->clock);
 584
 585         if (mmc->clk_disable)
 586                 stm32_sdmmc2_pwrcycle(priv);
 587         else
 588                 stm32_sdmmc2_pwron(priv);
 589
 590         /*
 591          * clk_div = 0 => command and data generated on SDMMCCLK falling edge
 592          * clk_div > 0 and NEGEDGE = 0 => command and data generated on
 593          * SDMMCCLK rising edge
 594          * clk_div > 0 and NEGEDGE = 1 => command and data generated on
 595          * SDMMCCLK falling edge
 596          */
 597         if (desired && ((sys_clock > desired) ||
 598                         IS_RISING_EDGE(priv->clk_reg_msk))) {
 599                 clk = DIV_ROUND_UP(sys_clock, 2 * desired);
 600                 if (clk > SDMMC_CLKCR_CLKDIV_MAX)
 601                         clk = SDMMC_CLKCR_CLKDIV_MAX;
 602         }
 603
 604         if (mmc->bus_width == 4)
 605                 clk |= SDMMC_CLKCR_WIDBUS_4;
 606         if (mmc->bus_width == 8)
 607                 clk |= SDMMC_CLKCR_WIDBUS_8;
 608
 609         writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN,
 610                priv->base + SDMMC_CLKCR);
 611
 612         return 0;
 613 }
 614
 615 static int stm32_sdmmc2_getcd(struct udevice *dev)
 616 {
 617         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 618
 619         debug("stm32_sdmmc2_getcd called\n");
 620
 621         if (dm_gpio_is_valid(&priv->cd_gpio))
 622                 return dm_gpio_get_value(&priv->cd_gpio);
 623
 624         return 1;
 625 }
 626
 627 static int stm32_sdmmc2_host_power_cycle(struct udevice *dev)
 628 {
 629         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 630
 631         writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
 632                priv->base + SDMMC_POWER);
 633
 634         return 0;
 635 }
 636
 637 static const struct dm_mmc_ops stm32_sdmmc2_ops = {
 638         .send_cmd = stm32_sdmmc2_send_cmd,
 639         .set_ios = stm32_sdmmc2_set_ios,
 640         .get_cd = stm32_sdmmc2_getcd,
 641         .host_power_cycle = stm32_sdmmc2_host_power_cycle,
 642 };
 643
 644 static int stm32_sdmmc2_probe(struct udevice *dev)
 645 {
 646         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 647         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
 648         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 649         struct mmc_config *cfg = &plat->cfg;
 650         int ret;
 651
 652         priv->base = dev_read_addr(dev);
 653         if (priv->base == FDT_ADDR_T_NONE)
 654                 return -EINVAL;
 655
 656         if (dev_read_bool(dev, "st,neg-edge"))
 657                 priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
 658         if (dev_read_bool(dev, "st,sig-dir"))
 659                 priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
 660         if (dev_read_bool(dev, "st,use-ckin"))
 661                 priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
 662
 663         ret = clk_get_by_index(dev, 0, &priv->clk);
 664         if (ret)
 665                 return ret;
 666
 667         ret = clk_enable(&priv->clk);
 668         if (ret)
 669                 goto clk_free;
 670
 671         ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
 672         if (ret)
 673                 goto clk_disable;
 674
 675         gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
 676                              GPIOD_IS_IN);
 677
 678         cfg->f_min = 400000;
 679         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 680         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 681         cfg->name = "STM32 SD/MMC";
 682
 683         cfg->host_caps = 0;
 684         cfg->f_max = 52000000;
 685         mmc_of_parse(dev, cfg);
 686
 687         upriv->mmc = &plat->mmc;
 688
 689         /* SDMMC init */
 690         stm32_sdmmc2_reset(priv);
 691         return 0;
 692
 693 clk_disable:
 694         clk_disable(&priv->clk);
 695 clk_free:
 696         clk_free(&priv->clk);
 697
 698         return ret;
 699 }
 700
 701 static int stm32_sdmmc_bind(struct udevice *dev)
 702 {
 703         struct stm32_sdmmc2_plat *plat = dev_get_plat(dev);
 704
 705         return mmc_bind(dev, &plat->mmc, &plat->cfg);
 706 }
 707
 708 static const struct udevice_id stm32_sdmmc2_ids[] = {
 709         { .compatible = "st,stm32-sdmmc2" },
 710         { }
 711 };
 712
 713 U_BOOT_DRIVER(stm32_sdmmc2) = {
 714         .name = "stm32_sdmmc2",
 715         .id = UCLASS_MMC,
 716         .of_match = stm32_sdmmc2_ids,
 717         .ops = &stm32_sdmmc2_ops,
 718         .probe = stm32_sdmmc2_probe,
 719         .bind = stm32_sdmmc_bind,
 720         .priv_auto      = sizeof(struct stm32_sdmmc2_priv),
 721         .plat_auto      = sizeof(struct stm32_sdmmc2_plat),
 722 };