drivers/mmc/stm32_sdmmc2.c

   1 /*
   2  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   3  * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <clk.h>
  10 #include <dm.h>
  11 #include <fdtdec.h>
  12 #include <linux/libfdt.h>
  13 #include <mmc.h>
  14 #include <reset.h>
  15 #include <asm/io.h>
  16 #include <asm/gpio.h>
  17 #include <linux/iopoll.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             GENMASK(1, 0)
  61 #define SDMMC_POWER_VSWITCH             BIT(2)
  62 #define SDMMC_POWER_VSWITCHEN           BIT(3)
  63 #define SDMMC_POWER_DIRPOL              BIT(4)
  64
  65 /* SDMMC_CLKCR register */
  66 #define SDMMC_CLKCR_CLKDIV              GENMASK(9, 0)
  67 #define SDMMC_CLKCR_CLKDIV_MAX          SDMMC_CLKCR_CLKDIV
  68 #define SDMMC_CLKCR_PWRSAV              BIT(12)
  69 #define SDMMC_CLKCR_WIDBUS_4            BIT(14)
  70 #define SDMMC_CLKCR_WIDBUS_8            BIT(15)
  71 #define SDMMC_CLKCR_NEGEDGE             BIT(16)
  72 #define SDMMC_CLKCR_HWFC_EN             BIT(17)
  73 #define SDMMC_CLKCR_DDR                 BIT(18)
  74 #define SDMMC_CLKCR_BUSSPEED            BIT(19)
  75 #define SDMMC_CLKCR_SELCLKRX_MASK       GENMASK(21, 20)
  76 #define SDMMC_CLKCR_SELCLKRX_CK         0
  77 #define SDMMC_CLKCR_SELCLKRX_CKIN       BIT(20)
  78 #define SDMMC_CLKCR_SELCLKRX_FBCK       BIT(21)
  79
  80 /* SDMMC_CMD register */
  81 #define SDMMC_CMD_CMDINDEX              GENMASK(5, 0)
  82 #define SDMMC_CMD_CMDTRANS              BIT(6)
  83 #define SDMMC_CMD_CMDSTOP               BIT(7)
  84 #define SDMMC_CMD_WAITRESP              GENMASK(9, 8)
  85 #define SDMMC_CMD_WAITRESP_0            BIT(8)
  86 #define SDMMC_CMD_WAITRESP_1            BIT(9)
  87 #define SDMMC_CMD_WAITINT               BIT(10)
  88 #define SDMMC_CMD_WAITPEND              BIT(11)
  89 #define SDMMC_CMD_CPSMEN                BIT(12)
  90 #define SDMMC_CMD_DTHOLD                BIT(13)
  91 #define SDMMC_CMD_BOOTMODE              BIT(14)
  92 #define SDMMC_CMD_BOOTEN                BIT(15)
  93 #define SDMMC_CMD_CMDSUSPEND            BIT(16)
  94
  95 /* SDMMC_DCTRL register */
  96 #define SDMMC_DCTRL_DTEN                BIT(0)
  97 #define SDMMC_DCTRL_DTDIR               BIT(1)
  98 #define SDMMC_DCTRL_DTMODE              GENMASK(3, 2)
  99 #define SDMMC_DCTRL_DBLOCKSIZE          GENMASK(7, 4)
 100 #define SDMMC_DCTRL_DBLOCKSIZE_SHIFT    4
 101 #define SDMMC_DCTRL_RWSTART             BIT(8)
 102 #define SDMMC_DCTRL_RWSTOP              BIT(9)
 103 #define SDMMC_DCTRL_RWMOD               BIT(10)
 104 #define SDMMC_DCTRL_SDMMCEN             BIT(11)
 105 #define SDMMC_DCTRL_BOOTACKEN           BIT(12)
 106 #define SDMMC_DCTRL_FIFORST             BIT(13)
 107
 108 /* SDMMC_STA register */
 109 #define SDMMC_STA_CCRCFAIL              BIT(0)
 110 #define SDMMC_STA_DCRCFAIL              BIT(1)
 111 #define SDMMC_STA_CTIMEOUT              BIT(2)
 112 #define SDMMC_STA_DTIMEOUT              BIT(3)
 113 #define SDMMC_STA_TXUNDERR              BIT(4)
 114 #define SDMMC_STA_RXOVERR               BIT(5)
 115 #define SDMMC_STA_CMDREND               BIT(6)
 116 #define SDMMC_STA_CMDSENT               BIT(7)
 117 #define SDMMC_STA_DATAEND               BIT(8)
 118 #define SDMMC_STA_DHOLD                 BIT(9)
 119 #define SDMMC_STA_DBCKEND               BIT(10)
 120 #define SDMMC_STA_DABORT                BIT(11)
 121 #define SDMMC_STA_DPSMACT               BIT(12)
 122 #define SDMMC_STA_CPSMACT               BIT(13)
 123 #define SDMMC_STA_TXFIFOHE              BIT(14)
 124 #define SDMMC_STA_RXFIFOHF              BIT(15)
 125 #define SDMMC_STA_TXFIFOF               BIT(16)
 126 #define SDMMC_STA_RXFIFOF               BIT(17)
 127 #define SDMMC_STA_TXFIFOE               BIT(18)
 128 #define SDMMC_STA_RXFIFOE               BIT(19)
 129 #define SDMMC_STA_BUSYD0                BIT(20)
 130 #define SDMMC_STA_BUSYD0END             BIT(21)
 131 #define SDMMC_STA_SDMMCIT               BIT(22)
 132 #define SDMMC_STA_ACKFAIL               BIT(23)
 133 #define SDMMC_STA_ACKTIMEOUT            BIT(24)
 134 #define SDMMC_STA_VSWEND                BIT(25)
 135 #define SDMMC_STA_CKSTOP                BIT(26)
 136 #define SDMMC_STA_IDMATE                BIT(27)
 137 #define SDMMC_STA_IDMABTC               BIT(28)
 138
 139 /* SDMMC_ICR register */
 140 #define SDMMC_ICR_CCRCFAILC             BIT(0)
 141 #define SDMMC_ICR_DCRCFAILC             BIT(1)
 142 #define SDMMC_ICR_CTIMEOUTC             BIT(2)
 143 #define SDMMC_ICR_DTIMEOUTC             BIT(3)
 144 #define SDMMC_ICR_TXUNDERRC             BIT(4)
 145 #define SDMMC_ICR_RXOVERRC              BIT(5)
 146 #define SDMMC_ICR_CMDRENDC              BIT(6)
 147 #define SDMMC_ICR_CMDSENTC              BIT(7)
 148 #define SDMMC_ICR_DATAENDC              BIT(8)
 149 #define SDMMC_ICR_DHOLDC                BIT(9)
 150 #define SDMMC_ICR_DBCKENDC              BIT(10)
 151 #define SDMMC_ICR_DABORTC               BIT(11)
 152 #define SDMMC_ICR_BUSYD0ENDC            BIT(21)
 153 #define SDMMC_ICR_SDMMCITC              BIT(22)
 154 #define SDMMC_ICR_ACKFAILC              BIT(23)
 155 #define SDMMC_ICR_ACKTIMEOUTC           BIT(24)
 156 #define SDMMC_ICR_VSWENDC               BIT(25)
 157 #define SDMMC_ICR_CKSTOPC               BIT(26)
 158 #define SDMMC_ICR_IDMATEC               BIT(27)
 159 #define SDMMC_ICR_IDMABTCC              BIT(28)
 160 #define SDMMC_ICR_STATIC_FLAGS          ((GENMASK(28, 21)) | (GENMASK(11, 0)))
 161
 162 /* SDMMC_MASK register */
 163 #define SDMMC_MASK_CCRCFAILIE           BIT(0)
 164 #define SDMMC_MASK_DCRCFAILIE           BIT(1)
 165 #define SDMMC_MASK_CTIMEOUTIE           BIT(2)
 166 #define SDMMC_MASK_DTIMEOUTIE           BIT(3)
 167 #define SDMMC_MASK_TXUNDERRIE           BIT(4)
 168 #define SDMMC_MASK_RXOVERRIE            BIT(5)
 169 #define SDMMC_MASK_CMDRENDIE            BIT(6)
 170 #define SDMMC_MASK_CMDSENTIE            BIT(7)
 171 #define SDMMC_MASK_DATAENDIE            BIT(8)
 172 #define SDMMC_MASK_DHOLDIE              BIT(9)
 173 #define SDMMC_MASK_DBCKENDIE            BIT(10)
 174 #define SDMMC_MASK_DABORTIE             BIT(11)
 175 #define SDMMC_MASK_TXFIFOHEIE           BIT(14)
 176 #define SDMMC_MASK_RXFIFOHFIE           BIT(15)
 177 #define SDMMC_MASK_RXFIFOFIE            BIT(17)
 178 #define SDMMC_MASK_TXFIFOEIE            BIT(18)
 179 #define SDMMC_MASK_BUSYD0ENDIE          BIT(21)
 180 #define SDMMC_MASK_SDMMCITIE            BIT(22)
 181 #define SDMMC_MASK_ACKFAILIE            BIT(23)
 182 #define SDMMC_MASK_ACKTIMEOUTIE         BIT(24)
 183 #define SDMMC_MASK_VSWENDIE             BIT(25)
 184 #define SDMMC_MASK_CKSTOPIE             BIT(26)
 185 #define SDMMC_MASK_IDMABTCIE            BIT(28)
 186
 187 /* SDMMC_IDMACTRL register */
 188 #define SDMMC_IDMACTRL_IDMAEN           BIT(0)
 189
 190 #define SDMMC_CMD_TIMEOUT               0xFFFFFFFF
 191
 192 static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv,
 193                                     struct mmc_data *data,
 194                                     struct stm32_sdmmc2_ctx *ctx)
 195 {
 196         u32 data_ctrl, idmabase0;
 197
 198         /* Configure the SDMMC DPSM (Data Path State Machine) */
 199         data_ctrl = (__ilog2(data->blocksize) <<
 200                      SDMMC_DCTRL_DBLOCKSIZE_SHIFT) &
 201                     SDMMC_DCTRL_DBLOCKSIZE;
 202
 203         if (data->flags & MMC_DATA_READ) {
 204                 data_ctrl |= SDMMC_DCTRL_DTDIR;
 205                 idmabase0 = (u32)data->dest;
 206         } else {
 207                 idmabase0 = (u32)data->src;
 208         }
 209
 210         /* Set the SDMMC Data TimeOut value */
 211         writel(SDMMC_CMD_TIMEOUT, priv->base + SDMMC_DTIMER);
 212
 213         /* Set the SDMMC DataLength value */
 214         writel(ctx->data_length, priv->base + SDMMC_DLEN);
 215
 216         /* Write to SDMMC DCTRL */
 217         writel(data_ctrl, priv->base + SDMMC_DCTRL);
 218
 219         /* Cache align */
 220         ctx->cache_start = rounddown(idmabase0, ARCH_DMA_MINALIGN);
 221         ctx->cache_end = roundup(idmabase0 + ctx->data_length,
 222                                  ARCH_DMA_MINALIGN);
 223
 224         /*
 225          * Flush data cache before DMA start (clean and invalidate)
 226          * Clean also needed for read
 227          * Avoid issue on buffer not cached-aligned
 228          */
 229         flush_dcache_range(ctx->cache_start, ctx->cache_end);
 230
 231         /* Enable internal DMA */
 232         writel(idmabase0, priv->base + SDMMC_IDMABASE0);
 233         writel(SDMMC_IDMACTRL_IDMAEN, priv->base + SDMMC_IDMACTRL);
 234 }
 235
 236 static void stm32_sdmmc2_start_cmd(struct stm32_sdmmc2_priv *priv,
 237                                    struct mmc_cmd *cmd, u32 cmd_param)
 238 {
 239         if (readl(priv->base + SDMMC_ARG) & SDMMC_CMD_CPSMEN)
 240                 writel(0, priv->base + SDMMC_ARG);
 241
 242         cmd_param |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
 243         if (cmd->resp_type & MMC_RSP_PRESENT) {
 244                 if (cmd->resp_type & MMC_RSP_136)
 245                         cmd_param |= SDMMC_CMD_WAITRESP;
 246                 else if (cmd->resp_type & MMC_RSP_CRC)
 247                         cmd_param |= SDMMC_CMD_WAITRESP_0;
 248                 else
 249                         cmd_param |= SDMMC_CMD_WAITRESP_1;
 250         }
 251
 252         /* Clear flags */
 253         writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 254
 255         /* Set SDMMC argument value */
 256         writel(cmd->cmdarg, priv->base + SDMMC_ARG);
 257
 258         /* Set SDMMC command parameters */
 259         writel(cmd_param, priv->base + SDMMC_CMD);
 260 }
 261
 262 static int stm32_sdmmc2_end_cmd(struct stm32_sdmmc2_priv *priv,
 263                                 struct mmc_cmd *cmd,
 264                                 struct stm32_sdmmc2_ctx *ctx)
 265 {
 266         u32 mask = SDMMC_STA_CTIMEOUT;
 267         u32 status;
 268         int ret;
 269
 270         if (cmd->resp_type & MMC_RSP_PRESENT) {
 271                 mask |= SDMMC_STA_CMDREND;
 272                 if (cmd->resp_type & MMC_RSP_CRC)
 273                         mask |= SDMMC_STA_CCRCFAIL;
 274         } else {
 275                 mask |= SDMMC_STA_CMDSENT;
 276         }
 277
 278         /* Polling status register */
 279         ret = readl_poll_timeout(priv->base + SDMMC_STA, status, status & mask,
 280                                  10000);
 281
 282         if (ret < 0) {
 283                 debug("%s: timeout reading SDMMC_STA register\n", __func__);
 284                 ctx->dpsm_abort = true;
 285                 return ret;
 286         }
 287
 288         /* Check status */
 289         if (status & SDMMC_STA_CTIMEOUT) {
 290                 debug("%s: error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
 291                       __func__, status, cmd->cmdidx);
 292                 ctx->dpsm_abort = true;
 293                 return -ETIMEDOUT;
 294         }
 295
 296         if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
 297                 debug("%s: error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
 298                       __func__, status, cmd->cmdidx);
 299                 ctx->dpsm_abort = true;
 300                 return -EILSEQ;
 301         }
 302
 303         if (status & SDMMC_STA_CMDREND && cmd->resp_type & MMC_RSP_PRESENT) {
 304                 cmd->response[0] = readl(priv->base + SDMMC_RESP1);
 305                 if (cmd->resp_type & MMC_RSP_136) {
 306                         cmd->response[1] = readl(priv->base + SDMMC_RESP2);
 307                         cmd->response[2] = readl(priv->base + SDMMC_RESP3);
 308                         cmd->response[3] = readl(priv->base + SDMMC_RESP4);
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int stm32_sdmmc2_end_data(struct stm32_sdmmc2_priv *priv,
 316                                  struct mmc_cmd *cmd,
 317                                  struct mmc_data *data,
 318                                  struct stm32_sdmmc2_ctx *ctx)
 319 {
 320         u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
 321                    SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
 322         u32 status;
 323
 324         if (data->flags & MMC_DATA_READ)
 325                 mask |= SDMMC_STA_RXOVERR;
 326         else
 327                 mask |= SDMMC_STA_TXUNDERR;
 328
 329         status = readl(priv->base + SDMMC_STA);
 330         while (!(status & mask))
 331                 status = readl(priv->base + SDMMC_STA);
 332
 333         /*
 334          * Need invalidate the dcache again to avoid any
 335          * cache-refill during the DMA operations (pre-fetching)
 336          */
 337         if (data->flags & MMC_DATA_READ)
 338                 invalidate_dcache_range(ctx->cache_start, ctx->cache_end);
 339
 340         if (status & SDMMC_STA_DCRCFAIL) {
 341                 debug("%s: error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
 342                       __func__, status, cmd->cmdidx);
 343                 if (readl(priv->base + SDMMC_DCOUNT))
 344                         ctx->dpsm_abort = true;
 345                 return -EILSEQ;
 346         }
 347
 348         if (status & SDMMC_STA_DTIMEOUT) {
 349                 debug("%s: error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
 350                       __func__, status, cmd->cmdidx);
 351                 ctx->dpsm_abort = true;
 352                 return -ETIMEDOUT;
 353         }
 354
 355         if (status & SDMMC_STA_TXUNDERR) {
 356                 debug("%s: error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
 357                       __func__, status, cmd->cmdidx);
 358                 ctx->dpsm_abort = true;
 359                 return -EIO;
 360         }
 361
 362         if (status & SDMMC_STA_RXOVERR) {
 363                 debug("%s: error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
 364                       __func__, status, cmd->cmdidx);
 365                 ctx->dpsm_abort = true;
 366                 return -EIO;
 367         }
 368
 369         if (status & SDMMC_STA_IDMATE) {
 370                 debug("%s: error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
 371                       __func__, status, cmd->cmdidx);
 372                 ctx->dpsm_abort = true;
 373                 return -EIO;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int stm32_sdmmc2_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 380                                  struct mmc_data *data)
 381 {
 382         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 383         struct stm32_sdmmc2_ctx ctx;
 384         u32 cmdat = data ? SDMMC_CMD_CMDTRANS : 0;
 385         int ret, retry = 3;
 386
 387 retry_cmd:
 388         ctx.data_length = 0;
 389         ctx.dpsm_abort = false;
 390
 391         if (data) {
 392                 ctx.data_length = data->blocks * data->blocksize;
 393                 stm32_sdmmc2_start_data(priv, data, &ctx);
 394         }
 395
 396         stm32_sdmmc2_start_cmd(priv, cmd, cmdat);
 397
 398         debug("%s: send cmd %d data: 0x%x @ 0x%x\n",
 399               __func__, cmd->cmdidx,
 400               data ? ctx.data_length : 0, (unsigned int)data);
 401
 402         ret = stm32_sdmmc2_end_cmd(priv, cmd, &ctx);
 403
 404         if (data && !ret)
 405                 ret = stm32_sdmmc2_end_data(priv, cmd, data, &ctx);
 406
 407         /* Clear flags */
 408         writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 409         if (data)
 410                 writel(0x0, priv->base + SDMMC_IDMACTRL);
 411
 412         /*
 413          * To stop Data Path State Machine, a stop_transmission command
 414          * shall be send on cmd or data errors.
 415          */
 416         if (ctx.dpsm_abort && (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {
 417                 struct mmc_cmd stop_cmd;
 418
 419                 stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
 420                 stop_cmd.cmdarg = 0;
 421                 stop_cmd.resp_type = MMC_RSP_R1b;
 422
 423                 debug("%s: send STOP command to abort dpsm treatments\n",
 424                       __func__);
 425
 426                 stm32_sdmmc2_start_cmd(priv, &stop_cmd, SDMMC_CMD_CMDSTOP);
 427                 stm32_sdmmc2_end_cmd(priv, &stop_cmd, &ctx);
 428
 429                 writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
 430         }
 431
 432         if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
 433                 printf("%s: cmd %d failed, retrying ...\n",
 434                        __func__, cmd->cmdidx);
 435                 retry--;
 436                 goto retry_cmd;
 437         }
 438
 439         debug("%s: end for CMD %d, ret = %d\n", __func__, cmd->cmdidx, ret);
 440
 441         return ret;
 442 }
 443
 444 static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv)
 445 {
 446         /* Reset */
 447         reset_assert(&priv->reset_ctl);
 448         udelay(2);
 449         reset_deassert(&priv->reset_ctl);
 450
 451         udelay(1000);
 452
 453         /* Set Power State to ON */
 454         writel(SDMMC_POWER_PWRCTRL | priv->pwr_reg_msk, priv->base + SDMMC_POWER);
 455
 456         /*
 457          * 1ms: required power up waiting time before starting the
 458          * SD initialization sequence
 459          */
 460         udelay(1000);
 461 }
 462
 463 #define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
 464 static int stm32_sdmmc2_set_ios(struct udevice *dev)
 465 {
 466         struct mmc *mmc = mmc_get_mmc_dev(dev);
 467         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 468         struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
 469         struct mmc_config *cfg = &plat->cfg;
 470         u32 desired = mmc->clock;
 471         u32 sys_clock = clk_get_rate(&priv->clk);
 472         u32 clk = 0;
 473
 474         debug("%s: bus_with = %d, clock = %d\n", __func__,
 475               mmc->bus_width, mmc->clock);
 476
 477         if ((mmc->bus_width == 1) && (desired == cfg->f_min))
 478                 stm32_sdmmc2_pwron(priv);
 479
 480         /*
 481          * clk_div = 0 => command and data generated on SDMMCCLK falling edge
 482          * clk_div > 0 and NEGEDGE = 0 => command and data generated on
 483          * SDMMCCLK rising edge
 484          * clk_div > 0 and NEGEDGE = 1 => command and data generated on
 485          * SDMMCCLK falling edge
 486          */
 487         if (desired && ((sys_clock > desired) ||
 488                         IS_RISING_EDGE(priv->clk_reg_msk))) {
 489                 clk = DIV_ROUND_UP(sys_clock, 2 * desired);
 490                 if (clk > SDMMC_CLKCR_CLKDIV_MAX)
 491                         clk = SDMMC_CLKCR_CLKDIV_MAX;
 492         }
 493
 494         if (mmc->bus_width == 4)
 495                 clk |= SDMMC_CLKCR_WIDBUS_4;
 496         if (mmc->bus_width == 8)
 497                 clk |= SDMMC_CLKCR_WIDBUS_8;
 498
 499         writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN,
 500                priv->base + SDMMC_CLKCR);
 501
 502         return 0;
 503 }
 504
 505 static int stm32_sdmmc2_getcd(struct udevice *dev)
 506 {
 507         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 508
 509         debug("stm32_sdmmc2_getcd called\n");
 510
 511         if (dm_gpio_is_valid(&priv->cd_gpio))
 512                 return dm_gpio_get_value(&priv->cd_gpio);
 513
 514         return 1;
 515 }
 516
 517 static const struct dm_mmc_ops stm32_sdmmc2_ops = {
 518         .send_cmd = stm32_sdmmc2_send_cmd,
 519         .set_ios = stm32_sdmmc2_set_ios,
 520         .get_cd = stm32_sdmmc2_getcd,
 521 };
 522
 523 static int stm32_sdmmc2_probe(struct udevice *dev)
 524 {
 525         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 526         struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
 527         struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
 528         struct mmc_config *cfg = &plat->cfg;
 529         int ret;
 530
 531         priv->base = dev_read_addr(dev);
 532         if (priv->base == FDT_ADDR_T_NONE)
 533                 return -EINVAL;
 534
 535         if (dev_read_bool(dev, "st,negedge"))
 536                 priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
 537         if (dev_read_bool(dev, "st,dirpol"))
 538                 priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
 539         if (dev_read_bool(dev, "st,pin-ckin"))
 540                 priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;
 541
 542         ret = clk_get_by_index(dev, 0, &priv->clk);
 543         if (ret)
 544                 return ret;
 545
 546         ret = clk_enable(&priv->clk);
 547         if (ret)
 548                 goto clk_free;
 549
 550         ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
 551         if (ret)
 552                 goto clk_disable;
 553
 554         gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
 555                              GPIOD_IS_IN);
 556
 557         cfg->f_min = 400000;
 558         cfg->f_max = dev_read_u32_default(dev, "max-frequency", 52000000);
 559         cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
 560         cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
 561         cfg->name = "STM32 SDMMC2";
 562
 563         cfg->host_caps = 0;
 564         if (cfg->f_max > 25000000)
 565                 cfg->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 566
 567         switch (dev_read_u32_default(dev, "bus-width", 1)) {
 568         case 8:
 569                 cfg->host_caps |= MMC_MODE_8BIT;
 570         case 4:
 571                 cfg->host_caps |= MMC_MODE_4BIT;
 572                 break;
 573         case 1:
 574                 break;
 575         default:
 576                 pr_err("invalid \"bus-width\" property, force to 1\n");
 577         }
 578
 579         upriv->mmc = &plat->mmc;
 580
 581         return 0;
 582
 583 clk_disable:
 584         clk_disable(&priv->clk);
 585 clk_free:
 586         clk_free(&priv->clk);
 587
 588         return ret;
 589 }
 590
 591 int stm32_sdmmc_bind(struct udevice *dev)
 592 {
 593         struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
 594
 595         return mmc_bind(dev, &plat->mmc, &plat->cfg);
 596 }
 597
 598 static const struct udevice_id stm32_sdmmc2_ids[] = {
 599         { .compatible = "st,stm32-sdmmc2" },
 600         { }
 601 };
 602
 603 U_BOOT_DRIVER(stm32_sdmmc2) = {
 604         .name = "stm32_sdmmc2",
 605         .id = UCLASS_MMC,
 606         .of_match = stm32_sdmmc2_ids,
 607         .ops = &stm32_sdmmc2_ops,
 608         .probe = stm32_sdmmc2_probe,
 609         .bind = stm32_sdmmc_bind,
 610         .priv_auto_alloc_size = sizeof(struct stm32_sdmmc2_priv),
 611         .platdata_auto_alloc_size = sizeof(struct stm32_sdmmc2_plat),
 612 };