drivers/mmc/host/dw_mmc-exynos.c

   1 /*
   2  * Exynos Specific Extensions for Synopsys DW Multimedia Card Interface driver
   3  *
   4  * Copyright (C) 2012, Samsung Electronics Co., Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/clk.h>
  15 #include <linux/mmc/host.h>
  16 #include <linux/mmc/dw_mmc.h>
  17 #include <linux/mmc/mmc.h>
  18 #include <linux/of.h>
  19 #include <linux/of_gpio.h>
  20 #include <linux/slab.h>
  21
  22 #include "dw_mmc.h"
  23 #include "dw_mmc-pltfm.h"
  24 #include "dw_mmc-exynos.h"
  25
  26 /* Variations in Exynos specific dw-mshc controller */
  27 enum dw_mci_exynos_type {
  28         DW_MCI_TYPE_EXYNOS4210,
  29         DW_MCI_TYPE_EXYNOS4412,
  30         DW_MCI_TYPE_EXYNOS5250,
  31         DW_MCI_TYPE_EXYNOS5420,
  32         DW_MCI_TYPE_EXYNOS5420_SMU,
  33         DW_MCI_TYPE_EXYNOS7,
  34         DW_MCI_TYPE_EXYNOS7_SMU,
  35 };
  36
  37 /* Exynos implementation specific driver private data */
  38 struct dw_mci_exynos_priv_data {
  39         enum dw_mci_exynos_type         ctrl_type;
  40         u8                              ciu_div;
  41         u32                             sdr_timing;
  42         u32                             ddr_timing;
  43         u32                             hs400_timing;
  44         u32                             tuned_sample;
  45         u32                             cur_speed;
  46         u32                             dqs_delay;
  47         u32                             saved_dqs_en;
  48         u32                             saved_strobe_ctrl;
  49 };
  50
  51 static struct dw_mci_exynos_compatible {
  52         char                            *compatible;
  53         enum dw_mci_exynos_type         ctrl_type;
  54 } exynos_compat[] = {
  55         {
  56                 .compatible     = "samsung,exynos4210-dw-mshc",
  57                 .ctrl_type      = DW_MCI_TYPE_EXYNOS4210,
  58         }, {
  59                 .compatible     = "samsung,exynos4412-dw-mshc",
  60                 .ctrl_type      = DW_MCI_TYPE_EXYNOS4412,
  61         }, {
  62                 .compatible     = "samsung,exynos5250-dw-mshc",
  63                 .ctrl_type      = DW_MCI_TYPE_EXYNOS5250,
  64         }, {
  65                 .compatible     = "samsung,exynos5420-dw-mshc",
  66                 .ctrl_type      = DW_MCI_TYPE_EXYNOS5420,
  67         }, {
  68                 .compatible     = "samsung,exynos5420-dw-mshc-smu",
  69                 .ctrl_type      = DW_MCI_TYPE_EXYNOS5420_SMU,
  70         }, {
  71                 .compatible     = "samsung,exynos7-dw-mshc",
  72                 .ctrl_type      = DW_MCI_TYPE_EXYNOS7,
  73         }, {
  74                 .compatible     = "samsung,exynos7-dw-mshc-smu",
  75                 .ctrl_type      = DW_MCI_TYPE_EXYNOS7_SMU,
  76         },
  77 };
  78
  79 static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host)
  80 {
  81         struct dw_mci_exynos_priv_data *priv = host->priv;
  82
  83         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
  84                 return EXYNOS4412_FIXED_CIU_CLK_DIV;
  85         else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
  86                 return EXYNOS4210_FIXED_CIU_CLK_DIV;
  87         else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
  88                         priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
  89                 return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1;
  90         else
  91                 return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1;
  92 }
  93
  94 static int dw_mci_exynos_priv_init(struct dw_mci *host)
  95 {
  96         struct dw_mci_exynos_priv_data *priv = host->priv;
  97
  98         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU ||
  99                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) {
 100                 mci_writel(host, MPSBEGIN0, 0);
 101                 mci_writel(host, MPSEND0, SDMMC_ENDING_SEC_NR_MAX);
 102                 mci_writel(host, MPSCTRL0, SDMMC_MPSCTRL_SECURE_WRITE_BIT |
 103                            SDMMC_MPSCTRL_NON_SECURE_READ_BIT |
 104                            SDMMC_MPSCTRL_VALID |
 105                            SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT);
 106         }
 107
 108         if (priv->ctrl_type >= DW_MCI_TYPE_EXYNOS5420) {
 109                 priv->saved_strobe_ctrl = mci_readl(host, HS400_DLINE_CTRL);
 110                 priv->saved_dqs_en = mci_readl(host, HS400_DQS_EN);
 111                 priv->saved_dqs_en |= AXI_NON_BLOCKING_WR;
 112                 mci_writel(host, HS400_DQS_EN, priv->saved_dqs_en);
 113                 if (!priv->dqs_delay)
 114                         priv->dqs_delay =
 115                                 DQS_CTRL_GET_RD_DELAY(priv->saved_strobe_ctrl);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static int dw_mci_exynos_setup_clock(struct dw_mci *host)
 122 {
 123         struct dw_mci_exynos_priv_data *priv = host->priv;
 124
 125         host->bus_hz /= (priv->ciu_div + 1);
 126
 127         return 0;
 128 }
 129
 130 static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing)
 131 {
 132         struct dw_mci_exynos_priv_data *priv = host->priv;
 133         u32 clksel;
 134
 135         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 136                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 137                 clksel = mci_readl(host, CLKSEL64);
 138         else
 139                 clksel = mci_readl(host, CLKSEL);
 140
 141         clksel = (clksel & ~SDMMC_CLKSEL_TIMING_MASK) | timing;
 142
 143         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 144                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 145                 mci_writel(host, CLKSEL64, clksel);
 146         else
 147                 mci_writel(host, CLKSEL, clksel);
 148 }
 149
 150 #ifdef CONFIG_PM_SLEEP
 151 static int dw_mci_exynos_suspend(struct device *dev)
 152 {
 153         struct dw_mci *host = dev_get_drvdata(dev);
 154
 155         return dw_mci_suspend(host);
 156 }
 157
 158 static int dw_mci_exynos_resume(struct device *dev)
 159 {
 160         struct dw_mci *host = dev_get_drvdata(dev);
 161
 162         dw_mci_exynos_priv_init(host);
 163         return dw_mci_resume(host);
 164 }
 165
 166 /**
 167  * dw_mci_exynos_resume_noirq - Exynos-specific resume code
 168  *
 169  * On exynos5420 there is a silicon errata that will sometimes leave the
 170  * WAKEUP_INT bit in the CLKSEL register asserted.  This bit is 1 to indicate
 171  * that it fired and we can clear it by writing a 1 back.  Clear it to prevent
 172  * interrupts from going off constantly.
 173  *
 174  * We run this code on all exynos variants because it doesn't hurt.
 175  */
 176
 177 static int dw_mci_exynos_resume_noirq(struct device *dev)
 178 {
 179         struct dw_mci *host = dev_get_drvdata(dev);
 180         struct dw_mci_exynos_priv_data *priv = host->priv;
 181         u32 clksel;
 182
 183         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 184                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 185                 clksel = mci_readl(host, CLKSEL64);
 186         else
 187                 clksel = mci_readl(host, CLKSEL);
 188
 189         if (clksel & SDMMC_CLKSEL_WAKEUP_INT) {
 190                 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 191                         priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 192                         mci_writel(host, CLKSEL64, clksel);
 193                 else
 194                         mci_writel(host, CLKSEL, clksel);
 195         }
 196
 197         return 0;
 198 }
 199 #else
 200 #define dw_mci_exynos_suspend           NULL
 201 #define dw_mci_exynos_resume            NULL
 202 #define dw_mci_exynos_resume_noirq      NULL
 203 #endif /* CONFIG_PM_SLEEP */
 204
 205 static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
 206 {
 207         struct dw_mci_exynos_priv_data *priv = host->priv;
 208         /*
 209          * Exynos4412 and Exynos5250 extends the use of CMD register with the
 210          * use of bit 29 (which is reserved on standard MSHC controllers) for
 211          * optionally bypassing the HOLD register for command and data. The
 212          * HOLD register should be bypassed in case there is no phase shift
 213          * applied on CMD/DATA that is sent to the card.
 214          */
 215         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 216                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) {
 217                 if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL64)))
 218                         *cmdr |= SDMMC_CMD_USE_HOLD_REG;
 219          } else {
 220                 if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL)))
 221                         *cmdr |= SDMMC_CMD_USE_HOLD_REG;
 222         }
 223 }
 224
 225 static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing)
 226 {
 227         struct dw_mci_exynos_priv_data *priv = host->priv;
 228         u32 dqs, strobe;
 229
 230         /*
 231          * Not supported to configure register
 232          * related to HS400
 233          */
 234         if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420)
 235                 return;
 236
 237         dqs = priv->saved_dqs_en;
 238         strobe = priv->saved_strobe_ctrl;
 239
 240         if (timing == MMC_TIMING_MMC_HS400) {
 241                 dqs |= DATA_STROBE_EN;
 242                 strobe = DQS_CTRL_RD_DELAY(strobe, priv->dqs_delay);
 243         } else {
 244                 dqs &= ~DATA_STROBE_EN;
 245         }
 246
 247         mci_writel(host, HS400_DQS_EN, dqs);
 248         mci_writel(host, HS400_DLINE_CTRL, strobe);
 249 }
 250
 251 static void dw_mci_exynos_adjust_clock(struct dw_mci *host, unsigned int wanted)
 252 {
 253         struct dw_mci_exynos_priv_data *priv = host->priv;
 254         unsigned long actual;
 255         u8 div;
 256         int ret;
 257         /*
 258          * Don't care if wanted clock is zero or
 259          * ciu clock is unavailable
 260          */
 261         if (!wanted || IS_ERR(host->ciu_clk))
 262                 return;
 263
 264         /* Guaranteed minimum frequency for cclkin */
 265         if (wanted < EXYNOS_CCLKIN_MIN)
 266                 wanted = EXYNOS_CCLKIN_MIN;
 267
 268         if (wanted == priv->cur_speed)
 269                 return;
 270
 271         div = dw_mci_exynos_get_ciu_div(host);
 272         ret = clk_set_rate(host->ciu_clk, wanted * div);
 273         if (ret)
 274                 dev_warn(host->dev,
 275                         "failed to set clk-rate %u error: %d\n",
 276                         wanted * div, ret);
 277         actual = clk_get_rate(host->ciu_clk);
 278         host->bus_hz = actual / div;
 279         priv->cur_speed = wanted;
 280         host->current_speed = 0;
 281 }
 282
 283 static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 284 {
 285         struct dw_mci_exynos_priv_data *priv = host->priv;
 286         unsigned int wanted = ios->clock;
 287         u32 timing = ios->timing, clksel;
 288
 289         switch (timing) {
 290         case MMC_TIMING_MMC_HS400:
 291                 /* Update tuned sample timing */
 292                 clksel = SDMMC_CLKSEL_UP_SAMPLE(
 293                                 priv->hs400_timing, priv->tuned_sample);
 294                 wanted <<= 1;
 295                 break;
 296         case MMC_TIMING_MMC_DDR52:
 297                 clksel = priv->ddr_timing;
 298                 /* Should be double rate for DDR mode */
 299                 if (ios->bus_width == MMC_BUS_WIDTH_8)
 300                         wanted <<= 1;
 301                 break;
 302         default:
 303                 clksel = priv->sdr_timing;
 304         }
 305
 306         /* Set clock timing for the requested speed mode*/
 307         dw_mci_exynos_set_clksel_timing(host, clksel);
 308
 309         /* Configure setting for HS400 */
 310         dw_mci_exynos_config_hs400(host, timing);
 311
 312         /* Configure clock rate */
 313         dw_mci_exynos_adjust_clock(host, wanted);
 314 }
 315
 316 static int dw_mci_exynos_parse_dt(struct dw_mci *host)
 317 {
 318         struct dw_mci_exynos_priv_data *priv;
 319         struct device_node *np = host->dev->of_node;
 320         u32 timing[2];
 321         u32 div = 0;
 322         int idx;
 323         int ret;
 324
 325         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
 326         if (!priv)
 327                 return -ENOMEM;
 328
 329         for (idx = 0; idx < ARRAY_SIZE(exynos_compat); idx++) {
 330                 if (of_device_is_compatible(np, exynos_compat[idx].compatible))
 331                         priv->ctrl_type = exynos_compat[idx].ctrl_type;
 332         }
 333
 334         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
 335                 priv->ciu_div = EXYNOS4412_FIXED_CIU_CLK_DIV - 1;
 336         else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
 337                 priv->ciu_div = EXYNOS4210_FIXED_CIU_CLK_DIV - 1;
 338         else {
 339                 of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div);
 340                 priv->ciu_div = div;
 341         }
 342
 343         ret = of_property_read_u32_array(np,
 344                         "samsung,dw-mshc-sdr-timing", timing, 2);
 345         if (ret)
 346                 return ret;
 347
 348         priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
 349
 350         ret = of_property_read_u32_array(np,
 351                         "samsung,dw-mshc-ddr-timing", timing, 2);
 352         if (ret)
 353                 return ret;
 354
 355         priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
 356
 357         ret = of_property_read_u32_array(np,
 358                         "samsung,dw-mshc-hs400-timing", timing, 2);
 359         if (!ret && of_property_read_u32(np,
 360                                 "samsung,read-strobe-delay", &priv->dqs_delay))
 361                 dev_dbg(host->dev,
 362                         "read-strobe-delay is not found, assuming usage of default value\n");
 363
 364         priv->hs400_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1],
 365                                                 HS400_FIXED_CIU_CLK_DIV);
 366         host->priv = priv;
 367         return 0;
 368 }
 369
 370 static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host)
 371 {
 372         struct dw_mci_exynos_priv_data *priv = host->priv;
 373
 374         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 375                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 376                 return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64));
 377         else
 378                 return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL));
 379 }
 380
 381 static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample)
 382 {
 383         u32 clksel;
 384         struct dw_mci_exynos_priv_data *priv = host->priv;
 385
 386         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 387                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 388                 clksel = mci_readl(host, CLKSEL64);
 389         else
 390                 clksel = mci_readl(host, CLKSEL);
 391         clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample);
 392         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 393                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 394                 mci_writel(host, CLKSEL64, clksel);
 395         else
 396                 mci_writel(host, CLKSEL, clksel);
 397 }
 398
 399 static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host)
 400 {
 401         struct dw_mci_exynos_priv_data *priv = host->priv;
 402         u32 clksel;
 403         u8 sample;
 404
 405         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 406                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 407                 clksel = mci_readl(host, CLKSEL64);
 408         else
 409                 clksel = mci_readl(host, CLKSEL);
 410
 411         sample = (clksel + 1) & 0x7;
 412         clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample);
 413
 414         if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
 415                 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
 416                 mci_writel(host, CLKSEL64, clksel);
 417         else
 418                 mci_writel(host, CLKSEL, clksel);
 419
 420         return sample;
 421 }
 422
 423 static s8 dw_mci_exynos_get_best_clksmpl(u8 candiates)
 424 {
 425         const u8 iter = 8;
 426         u8 __c;
 427         s8 i, loc = -1;
 428
 429         for (i = 0; i < iter; i++) {
 430                 __c = ror8(candiates, i);
 431                 if ((__c & 0xc7) == 0xc7) {
 432                         loc = i;
 433                         goto out;
 434                 }
 435         }
 436
 437         for (i = 0; i < iter; i++) {
 438                 __c = ror8(candiates, i);
 439                 if ((__c & 0x83) == 0x83) {
 440                         loc = i;
 441                         goto out;
 442                 }
 443         }
 444
 445 out:
 446         return loc;
 447 }
 448
 449 static int dw_mci_exynos_execute_tuning(struct dw_mci_slot *slot)
 450 {
 451         struct dw_mci *host = slot->host;
 452         struct dw_mci_exynos_priv_data *priv = host->priv;
 453         struct mmc_host *mmc = slot->mmc;
 454         u8 start_smpl, smpl, candiates = 0;
 455         s8 found = -1;
 456         int ret = 0;
 457
 458         start_smpl = dw_mci_exynos_get_clksmpl(host);
 459
 460         do {
 461                 mci_writel(host, TMOUT, ~0);
 462                 smpl = dw_mci_exynos_move_next_clksmpl(host);
 463
 464                 if (!mmc_send_tuning(mmc))
 465                         candiates |= (1 << smpl);
 466
 467         } while (start_smpl != smpl);
 468
 469         found = dw_mci_exynos_get_best_clksmpl(candiates);
 470         if (found >= 0) {
 471                 dw_mci_exynos_set_clksmpl(host, found);
 472                 priv->tuned_sample = found;
 473         } else {
 474                 ret = -EIO;
 475         }
 476
 477         return ret;
 478 }
 479
 480 static int dw_mci_exynos_prepare_hs400_tuning(struct dw_mci *host,
 481                                         struct mmc_ios *ios)
 482 {
 483         struct dw_mci_exynos_priv_data *priv = host->priv;
 484
 485         dw_mci_exynos_set_clksel_timing(host, priv->hs400_timing);
 486         dw_mci_exynos_adjust_clock(host, (ios->clock) << 1);
 487
 488         return 0;
 489 }
 490
 491 /* Common capabilities of Exynos4/Exynos5 SoC */
 492 static unsigned long exynos_dwmmc_caps[4] = {
 493         MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23,
 494         MMC_CAP_CMD23,
 495         MMC_CAP_CMD23,
 496         MMC_CAP_CMD23,
 497 };
 498
 499 static const struct dw_mci_drv_data exynos_drv_data = {
 500         .caps                   = exynos_dwmmc_caps,
 501         .init                   = dw_mci_exynos_priv_init,
 502         .setup_clock            = dw_mci_exynos_setup_clock,
 503         .prepare_command        = dw_mci_exynos_prepare_command,
 504         .set_ios                = dw_mci_exynos_set_ios,
 505         .parse_dt               = dw_mci_exynos_parse_dt,
 506         .execute_tuning         = dw_mci_exynos_execute_tuning,
 507         .prepare_hs400_tuning   = dw_mci_exynos_prepare_hs400_tuning,
 508 };
 509
 510 static const struct of_device_id dw_mci_exynos_match[] = {
 511         { .compatible = "samsung,exynos4412-dw-mshc",
 512                         .data = &exynos_drv_data, },
 513         { .compatible = "samsung,exynos5250-dw-mshc",
 514                         .data = &exynos_drv_data, },
 515         { .compatible = "samsung,exynos5420-dw-mshc",
 516                         .data = &exynos_drv_data, },
 517         { .compatible = "samsung,exynos5420-dw-mshc-smu",
 518                         .data = &exynos_drv_data, },
 519         { .compatible = "samsung,exynos7-dw-mshc",
 520                         .data = &exynos_drv_data, },
 521         { .compatible = "samsung,exynos7-dw-mshc-smu",
 522                         .data = &exynos_drv_data, },
 523         {},
 524 };
 525 MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
 526
 527 static int dw_mci_exynos_probe(struct platform_device *pdev)
 528 {
 529         const struct dw_mci_drv_data *drv_data;
 530         const struct of_device_id *match;
 531
 532         match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
 533         drv_data = match->data;
 534         return dw_mci_pltfm_register(pdev, drv_data);
 535 }
 536
 537 static const struct dev_pm_ops dw_mci_exynos_pmops = {
 538         SET_SYSTEM_SLEEP_PM_OPS(dw_mci_exynos_suspend, dw_mci_exynos_resume)
 539         .resume_noirq = dw_mci_exynos_resume_noirq,
 540         .thaw_noirq = dw_mci_exynos_resume_noirq,
 541         .restore_noirq = dw_mci_exynos_resume_noirq,
 542 };
 543
 544 static struct platform_driver dw_mci_exynos_pltfm_driver = {
 545         .probe          = dw_mci_exynos_probe,
 546         .remove         = dw_mci_pltfm_remove,
 547         .driver         = {
 548                 .name           = "dwmmc_exynos",
 549                 .of_match_table = dw_mci_exynos_match,
 550                 .pm             = &dw_mci_exynos_pmops,
 551         },
 552 };
 553
 554 module_platform_driver(dw_mci_exynos_pltfm_driver);
 555
 556 MODULE_DESCRIPTION("Samsung Specific DW-MSHC Driver Extension");
 557 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com");
 558 MODULE_LICENSE("GPL v2");
 559 MODULE_ALIAS("platform:dwmmc_exynos");