drivers/mmc/host/sdhci-omap.c

   1 /**
   2  * SDHCI Controller driver for TI's OMAP SoCs
   3  *
   4  * Copyright (C) 2017 Texas Instruments
   5  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 of
   9  * the License as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/delay.h>
  21 #include <linux/mmc/slot-gpio.h>
  22 #include <linux/module.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/regulator/consumer.h>
  28
  29 #include "sdhci-pltfm.h"
  30
  31 #define SDHCI_OMAP_CON          0x12c
  32 #define CON_DW8                 BIT(5)
  33 #define CON_DMA_MASTER          BIT(20)
  34 #define CON_INIT                BIT(1)
  35 #define CON_OD                  BIT(0)
  36
  37 #define SDHCI_OMAP_CMD          0x20c
  38
  39 #define SDHCI_OMAP_HCTL         0x228
  40 #define HCTL_SDBP               BIT(8)
  41 #define HCTL_SDVS_SHIFT         9
  42 #define HCTL_SDVS_MASK          (0x7 << HCTL_SDVS_SHIFT)
  43 #define HCTL_SDVS_33            (0x7 << HCTL_SDVS_SHIFT)
  44 #define HCTL_SDVS_30            (0x6 << HCTL_SDVS_SHIFT)
  45 #define HCTL_SDVS_18            (0x5 << HCTL_SDVS_SHIFT)
  46
  47 #define SDHCI_OMAP_SYSCTL       0x22c
  48 #define SYSCTL_CEN              BIT(2)
  49 #define SYSCTL_CLKD_SHIFT       6
  50 #define SYSCTL_CLKD_MASK        0x3ff
  51
  52 #define SDHCI_OMAP_STAT         0x230
  53
  54 #define SDHCI_OMAP_IE           0x234
  55 #define INT_CC_EN               BIT(0)
  56
  57 #define SDHCI_OMAP_AC12         0x23c
  58 #define AC12_V1V8_SIGEN         BIT(19)
  59
  60 #define SDHCI_OMAP_CAPA         0x240
  61 #define CAPA_VS33               BIT(24)
  62 #define CAPA_VS30               BIT(25)
  63 #define CAPA_VS18               BIT(26)
  64
  65 #define SDHCI_OMAP_TIMEOUT      1               /* 1 msec */
  66
  67 #define SYSCTL_CLKD_MAX         0x3FF
  68
  69 #define IOV_1V8                 1800000         /* 180000 uV */
  70 #define IOV_3V0                 3000000         /* 300000 uV */
  71 #define IOV_3V3                 3300000         /* 330000 uV */
  72
  73 struct sdhci_omap_data {
  74         u32 offset;
  75 };
  76
  77 struct sdhci_omap_host {
  78         void __iomem            *base;
  79         struct device           *dev;
  80         struct  regulator       *pbias;
  81         bool                    pbias_enabled;
  82         struct sdhci_host       *host;
  83         u8                      bus_mode;
  84         u8                      power_mode;
  85 };
  86
  87 static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
  88                                    unsigned int offset)
  89 {
  90         return readl(host->base + offset);
  91 }
  92
  93 static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
  94                                      unsigned int offset, u32 data)
  95 {
  96         writel(data, host->base + offset);
  97 }
  98
  99 static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
 100                                 bool power_on, unsigned int iov)
 101 {
 102         int ret;
 103         struct device *dev = omap_host->dev;
 104
 105         if (IS_ERR(omap_host->pbias))
 106                 return 0;
 107
 108         if (power_on) {
 109                 ret = regulator_set_voltage(omap_host->pbias, iov, iov);
 110                 if (ret) {
 111                         dev_err(dev, "pbias set voltage failed\n");
 112                         return ret;
 113                 }
 114
 115                 if (omap_host->pbias_enabled)
 116                         return 0;
 117
 118                 ret = regulator_enable(omap_host->pbias);
 119                 if (ret) {
 120                         dev_err(dev, "pbias reg enable fail\n");
 121                         return ret;
 122                 }
 123
 124                 omap_host->pbias_enabled = true;
 125         } else {
 126                 if (!omap_host->pbias_enabled)
 127                         return 0;
 128
 129                 ret = regulator_disable(omap_host->pbias);
 130                 if (ret) {
 131                         dev_err(dev, "pbias reg disable fail\n");
 132                         return ret;
 133                 }
 134                 omap_host->pbias_enabled = false;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
 141                                  unsigned int iov)
 142 {
 143         int ret;
 144         struct sdhci_host *host = omap_host->host;
 145         struct mmc_host *mmc = host->mmc;
 146
 147         ret = sdhci_omap_set_pbias(omap_host, false, 0);
 148         if (ret)
 149                 return ret;
 150
 151         if (!IS_ERR(mmc->supply.vqmmc)) {
 152                 ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov);
 153                 if (ret) {
 154                         dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
 155                         return ret;
 156                 }
 157         }
 158
 159         ret = sdhci_omap_set_pbias(omap_host, true, iov);
 160         if (ret)
 161                 return ret;
 162
 163         return 0;
 164 }
 165
 166 static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
 167                                       unsigned char signal_voltage)
 168 {
 169         u32 reg;
 170         ktime_t timeout;
 171
 172         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
 173         reg &= ~HCTL_SDVS_MASK;
 174
 175         if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
 176                 reg |= HCTL_SDVS_33;
 177         else
 178                 reg |= HCTL_SDVS_18;
 179
 180         sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
 181
 182         reg |= HCTL_SDBP;
 183         sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
 184
 185         /* wait 1ms */
 186         timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
 187         while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)) {
 188                 if (WARN_ON(ktime_after(ktime_get(), timeout)))
 189                         return;
 190                 usleep_range(5, 10);
 191         }
 192 }
 193
 194 static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
 195                                                   struct mmc_ios *ios)
 196 {
 197         u32 reg;
 198         int ret;
 199         unsigned int iov;
 200         struct sdhci_host *host = mmc_priv(mmc);
 201         struct sdhci_pltfm_host *pltfm_host;
 202         struct sdhci_omap_host *omap_host;
 203         struct device *dev;
 204
 205         pltfm_host = sdhci_priv(host);
 206         omap_host = sdhci_pltfm_priv(pltfm_host);
 207         dev = omap_host->dev;
 208
 209         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
 210                 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
 211                 if (!(reg & CAPA_VS33))
 212                         return -EOPNOTSUPP;
 213
 214                 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
 215
 216                 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
 217                 reg &= ~AC12_V1V8_SIGEN;
 218                 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
 219
 220                 iov = IOV_3V3;
 221         } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
 222                 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
 223                 if (!(reg & CAPA_VS18))
 224                         return -EOPNOTSUPP;
 225
 226                 sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
 227
 228                 reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
 229                 reg |= AC12_V1V8_SIGEN;
 230                 sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
 231
 232                 iov = IOV_1V8;
 233         } else {
 234                 return -EOPNOTSUPP;
 235         }
 236
 237         ret = sdhci_omap_enable_iov(omap_host, iov);
 238         if (ret) {
 239                 dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
 240                 return ret;
 241         }
 242
 243         dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
 244         return 0;
 245 }
 246
 247 static void sdhci_omap_set_power_mode(struct sdhci_omap_host *omap_host,
 248                                       u8 power_mode)
 249 {
 250         omap_host->power_mode = power_mode;
 251 }
 252
 253 static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
 254                                     unsigned int mode)
 255 {
 256         u32 reg;
 257
 258         if (omap_host->bus_mode == mode)
 259                 return;
 260
 261         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
 262         if (mode == MMC_BUSMODE_OPENDRAIN)
 263                 reg |= CON_OD;
 264         else
 265                 reg &= ~CON_OD;
 266         sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
 267
 268         omap_host->bus_mode = mode;
 269 }
 270
 271 static void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 272 {
 273         struct sdhci_host *host = mmc_priv(mmc);
 274         struct sdhci_pltfm_host *pltfm_host;
 275         struct sdhci_omap_host *omap_host;
 276
 277         pltfm_host = sdhci_priv(host);
 278         omap_host = sdhci_pltfm_priv(pltfm_host);
 279
 280         sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
 281         sdhci_set_ios(mmc, ios);
 282         sdhci_omap_set_power_mode(omap_host, ios->power_mode);
 283 }
 284
 285 static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
 286                                    unsigned int clock)
 287 {
 288         u16 dsor;
 289
 290         dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
 291         if (dsor > SYSCTL_CLKD_MAX)
 292                 dsor = SYSCTL_CLKD_MAX;
 293
 294         return dsor;
 295 }
 296
 297 static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
 298 {
 299         u32 reg;
 300
 301         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
 302         reg |= SYSCTL_CEN;
 303         sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
 304 }
 305
 306 static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
 307 {
 308         u32 reg;
 309
 310         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
 311         reg &= ~SYSCTL_CEN;
 312         sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
 313 }
 314
 315 static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
 316 {
 317         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 318         struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
 319         unsigned long clkdiv;
 320
 321         sdhci_omap_stop_clock(omap_host);
 322
 323         if (!clock)
 324                 return;
 325
 326         clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
 327         clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
 328         sdhci_enable_clk(host, clkdiv);
 329
 330         sdhci_omap_start_clock(omap_host);
 331 }
 332
 333 static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
 334                           unsigned short vdd)
 335 {
 336         struct mmc_host *mmc = host->mmc;
 337
 338         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
 339 }
 340
 341 static int sdhci_omap_enable_dma(struct sdhci_host *host)
 342 {
 343         u32 reg;
 344         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 345         struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
 346
 347         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
 348         reg |= CON_DMA_MASTER;
 349         sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
 350
 351         return 0;
 352 }
 353
 354 static unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
 355 {
 356         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 357
 358         return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
 359 }
 360
 361 static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
 362 {
 363         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 364         struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
 365         u32 reg;
 366
 367         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
 368         if (width == MMC_BUS_WIDTH_8)
 369                 reg |= CON_DW8;
 370         else
 371                 reg &= ~CON_DW8;
 372         sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
 373
 374         sdhci_set_bus_width(host, width);
 375 }
 376
 377 static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
 378 {
 379         u32 reg;
 380         ktime_t timeout;
 381         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 382         struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
 383
 384         if (omap_host->power_mode == power_mode)
 385                 return;
 386
 387         if (power_mode != MMC_POWER_ON)
 388                 return;
 389
 390         disable_irq(host->irq);
 391
 392         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
 393         reg |= CON_INIT;
 394         sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
 395         sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);
 396
 397         /* wait 1ms */
 398         timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
 399         while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)) {
 400                 if (WARN_ON(ktime_after(ktime_get(), timeout)))
 401                         return;
 402                 usleep_range(5, 10);
 403         }
 404
 405         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
 406         reg &= ~CON_INIT;
 407         sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
 408         sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);
 409
 410         enable_irq(host->irq);
 411 }
 412
 413 static struct sdhci_ops sdhci_omap_ops = {
 414         .set_clock = sdhci_omap_set_clock,
 415         .set_power = sdhci_omap_set_power,
 416         .enable_dma = sdhci_omap_enable_dma,
 417         .get_max_clock = sdhci_pltfm_clk_get_max_clock,
 418         .get_min_clock = sdhci_omap_get_min_clock,
 419         .set_bus_width = sdhci_omap_set_bus_width,
 420         .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
 421         .reset = sdhci_reset,
 422         .set_uhs_signaling = sdhci_set_uhs_signaling,
 423 };
 424
 425 static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
 426 {
 427         u32 reg;
 428         int ret = 0;
 429         struct device *dev = omap_host->dev;
 430         struct regulator *vqmmc;
 431
 432         vqmmc = regulator_get(dev, "vqmmc");
 433         if (IS_ERR(vqmmc)) {
 434                 ret = PTR_ERR(vqmmc);
 435                 goto reg_put;
 436         }
 437
 438         /* voltage capabilities might be set by boot loader, clear it */
 439         reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
 440         reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);
 441
 442         if (regulator_is_supported_voltage(vqmmc, IOV_3V3, IOV_3V3))
 443                 reg |= CAPA_VS33;
 444         if (regulator_is_supported_voltage(vqmmc, IOV_1V8, IOV_1V8))
 445                 reg |= CAPA_VS18;
 446
 447         sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);
 448
 449 reg_put:
 450         regulator_put(vqmmc);
 451
 452         return ret;
 453 }
 454
 455 static const struct sdhci_pltfm_data sdhci_omap_pdata = {
 456         .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
 457                   SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
 458                   SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
 459                   SDHCI_QUIRK_NO_HISPD_BIT |
 460                   SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
 461         .quirks2 = SDHCI_QUIRK2_NO_1_8_V |
 462                    SDHCI_QUIRK2_ACMD23_BROKEN |
 463                    SDHCI_QUIRK2_RSP_136_HAS_CRC,
 464         .ops = &sdhci_omap_ops,
 465 };
 466
 467 static const struct sdhci_omap_data dra7_data = {
 468         .offset = 0x200,
 469 };
 470
 471 static const struct of_device_id omap_sdhci_match[] = {
 472         { .compatible = "ti,dra7-sdhci", .data = &dra7_data },
 473         {},
 474 };
 475 MODULE_DEVICE_TABLE(of, omap_sdhci_match);
 476
 477 static int sdhci_omap_probe(struct platform_device *pdev)
 478 {
 479         int ret;
 480         u32 offset;
 481         struct device *dev = &pdev->dev;
 482         struct sdhci_host *host;
 483         struct sdhci_pltfm_host *pltfm_host;
 484         struct sdhci_omap_host *omap_host;
 485         struct mmc_host *mmc;
 486         const struct of_device_id *match;
 487         struct sdhci_omap_data *data;
 488
 489         match = of_match_device(omap_sdhci_match, dev);
 490         if (!match)
 491                 return -EINVAL;
 492
 493         data = (struct sdhci_omap_data *)match->data;
 494         if (!data) {
 495                 dev_err(dev, "no sdhci omap data\n");
 496                 return -EINVAL;
 497         }
 498         offset = data->offset;
 499
 500         host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
 501                                 sizeof(*omap_host));
 502         if (IS_ERR(host)) {
 503                 dev_err(dev, "Failed sdhci_pltfm_init\n");
 504                 return PTR_ERR(host);
 505         }
 506
 507         pltfm_host = sdhci_priv(host);
 508         omap_host = sdhci_pltfm_priv(pltfm_host);
 509         omap_host->host = host;
 510         omap_host->base = host->ioaddr;
 511         omap_host->dev = dev;
 512         omap_host->power_mode = MMC_POWER_UNDEFINED;
 513         host->ioaddr += offset;
 514
 515         mmc = host->mmc;
 516         ret = mmc_of_parse(mmc);
 517         if (ret)
 518                 goto err_pltfm_free;
 519
 520         pltfm_host->clk = devm_clk_get(dev, "fck");
 521         if (IS_ERR(pltfm_host->clk)) {
 522                 ret = PTR_ERR(pltfm_host->clk);
 523                 goto err_pltfm_free;
 524         }
 525
 526         ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
 527         if (ret) {
 528                 dev_err(dev, "failed to set clock to %d\n", mmc->f_max);
 529                 goto err_pltfm_free;
 530         }
 531
 532         omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
 533         if (IS_ERR(omap_host->pbias)) {
 534                 ret = PTR_ERR(omap_host->pbias);
 535                 if (ret != -ENODEV)
 536                         goto err_pltfm_free;
 537                 dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
 538         }
 539         omap_host->pbias_enabled = false;
 540
 541         /*
 542          * omap_device_pm_domain has callbacks to enable the main
 543          * functional clock, interface clock and also configure the
 544          * SYSCONFIG register of omap devices. The callback will be invoked
 545          * as part of pm_runtime_get_sync.
 546          */
 547         pm_runtime_enable(dev);
 548         ret = pm_runtime_get_sync(dev);
 549         if (ret < 0) {
 550                 dev_err(dev, "pm_runtime_get_sync failed\n");
 551                 pm_runtime_put_noidle(dev);
 552                 goto err_rpm_disable;
 553         }
 554
 555         ret = sdhci_omap_set_capabilities(omap_host);
 556         if (ret) {
 557                 dev_err(dev, "failed to set system capabilities\n");
 558                 goto err_put_sync;
 559         }
 560
 561         host->mmc_host_ops.get_ro = mmc_gpio_get_ro;
 562         host->mmc_host_ops.start_signal_voltage_switch =
 563                                         sdhci_omap_start_signal_voltage_switch;
 564         host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
 565
 566         sdhci_read_caps(host);
 567         host->caps |= SDHCI_CAN_DO_ADMA2;
 568
 569         ret = sdhci_add_host(host);
 570         if (ret)
 571                 goto err_put_sync;
 572
 573         return 0;
 574
 575 err_put_sync:
 576         pm_runtime_put_sync(dev);
 577
 578 err_rpm_disable:
 579         pm_runtime_disable(dev);
 580
 581 err_pltfm_free:
 582         sdhci_pltfm_free(pdev);
 583         return ret;
 584 }
 585
 586 static int sdhci_omap_remove(struct platform_device *pdev)
 587 {
 588         struct device *dev = &pdev->dev;
 589         struct sdhci_host *host = platform_get_drvdata(pdev);
 590
 591         sdhci_remove_host(host, true);
 592         pm_runtime_put_sync(dev);
 593         pm_runtime_disable(dev);
 594         sdhci_pltfm_free(pdev);
 595
 596         return 0;
 597 }
 598
 599 static struct platform_driver sdhci_omap_driver = {
 600         .probe = sdhci_omap_probe,
 601         .remove = sdhci_omap_remove,
 602         .driver = {
 603                    .name = "sdhci-omap",
 604                    .of_match_table = omap_sdhci_match,
 605                   },
 606 };
 607
 608 module_platform_driver(sdhci_omap_driver);
 609
 610 MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
 611 MODULE_AUTHOR("Texas Instruments Inc.");
 612 MODULE_LICENSE("GPL v2");
 613 MODULE_ALIAS("platform:sdhci_omap");