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   1 /*
   2  * drivers/mmc/host/omap_hsmmc.c
   3  *
   4  * Driver for OMAP2430/3430 MMC controller.
   5  *
   6  * Copyright (C) 2007 Texas Instruments.
   7  *
   8  * Authors:
   9  *      Syed Mohammed Khasim    <x0khasim@ti.com>
  10  *      Madhusudhan             <madhu.cr@ti.com>
  11  *      Mohit Jalori            <mjalori@ti.com>
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2. This program is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/delay.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/timer.h>
  26 #include <linux/clk.h>
  27 #include <linux/mmc/host.h>
  28 #include <linux/io.h>
  29 #include <linux/semaphore.h>
  30 #include <mach/dma.h>
  31 #include <mach/hardware.h>
  32 #include <mach/board.h>
  33 #include <mach/mmc.h>
  34 #include <mach/cpu.h>
  35
  36 /* OMAP HSMMC Host Controller Registers */
  37 #define OMAP_HSMMC_SYSCONFIG    0x0010
  38 #define OMAP_HSMMC_CON          0x002C
  39 #define OMAP_HSMMC_BLK          0x0104
  40 #define OMAP_HSMMC_ARG          0x0108
  41 #define OMAP_HSMMC_CMD          0x010C
  42 #define OMAP_HSMMC_RSP10        0x0110
  43 #define OMAP_HSMMC_RSP32        0x0114
  44 #define OMAP_HSMMC_RSP54        0x0118
  45 #define OMAP_HSMMC_RSP76        0x011C
  46 #define OMAP_HSMMC_DATA         0x0120
  47 #define OMAP_HSMMC_HCTL         0x0128
  48 #define OMAP_HSMMC_SYSCTL       0x012C
  49 #define OMAP_HSMMC_STAT         0x0130
  50 #define OMAP_HSMMC_IE           0x0134
  51 #define OMAP_HSMMC_ISE          0x0138
  52 #define OMAP_HSMMC_CAPA         0x0140
  53
  54 #define VS18                    (1 << 26)
  55 #define VS30                    (1 << 25)
  56 #define SDVS18                  (0x5 << 9)
  57 #define SDVS30                  (0x6 << 9)
  58 #define SDVSCLR                 0xFFFFF1FF
  59 #define SDVSDET                 0x00000400
  60 #define AUTOIDLE                0x1
  61 #define SDBP                    (1 << 8)
  62 #define DTO                     0xe
  63 #define ICE                     0x1
  64 #define ICS                     0x2
  65 #define CEN                     (1 << 2)
  66 #define CLKD_MASK               0x0000FFC0
  67 #define CLKD_SHIFT              6
  68 #define DTO_MASK                0x000F0000
  69 #define DTO_SHIFT               16
  70 #define INT_EN_MASK             0x307F0033
  71 #define INIT_STREAM             (1 << 1)
  72 #define DP_SELECT               (1 << 21)
  73 #define DDIR                    (1 << 4)
  74 #define DMA_EN                  0x1
  75 #define MSBS                    (1 << 5)
  76 #define BCE                     (1 << 1)
  77 #define FOUR_BIT                (1 << 1)
  78 #define CC                      0x1
  79 #define TC                      0x02
  80 #define OD                      0x1
  81 #define ERR                     (1 << 15)
  82 #define CMD_TIMEOUT             (1 << 16)
  83 #define DATA_TIMEOUT            (1 << 20)
  84 #define CMD_CRC                 (1 << 17)
  85 #define DATA_CRC                (1 << 21)
  86 #define CARD_ERR                (1 << 28)
  87 #define STAT_CLEAR              0xFFFFFFFF
  88 #define INIT_STREAM_CMD         0x00000000
  89 #define DUAL_VOLT_OCR_BIT       7
  90 #define SRC                     (1 << 25)
  91 #define SRD                     (1 << 26)
  92
  93 /*
  94  * FIXME: Most likely all the data using these _DEVID defines should come
  95  * from the platform_data, or implemented in controller and slot specific
  96  * functions.
  97  */
  98 #define OMAP_MMC1_DEVID         0
  99 #define OMAP_MMC2_DEVID         1
 100
 101 #define OMAP_MMC_DATADIR_NONE   0
 102 #define OMAP_MMC_DATADIR_READ   1
 103 #define OMAP_MMC_DATADIR_WRITE  2
 104 #define MMC_TIMEOUT_MS          20
 105 #define OMAP_MMC_MASTER_CLOCK   96000000
 106 #define DRIVER_NAME             "mmci-omap-hs"
 107
 108 /*
 109  * One controller can have multiple slots, like on some omap boards using
 110  * omap.c controller driver. Luckily this is not currently done on any known
 111  * omap_hsmmc.c device.
 112  */
 113 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
 114
 115 /*
 116  * MMC Host controller read/write API's
 117  */
 118 #define OMAP_HSMMC_READ(base, reg)      \
 119         __raw_readl((base) + OMAP_HSMMC_##reg)
 120
 121 #define OMAP_HSMMC_WRITE(base, reg, val) \
 122         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
 123
 124 struct mmc_omap_host {
 125         struct  device          *dev;
 126         struct  mmc_host        *mmc;
 127         struct  mmc_request     *mrq;
 128         struct  mmc_command     *cmd;
 129         struct  mmc_data        *data;
 130         struct  clk             *fclk;
 131         struct  clk             *iclk;
 132         struct  clk             *dbclk;
 133         struct  semaphore       sem;
 134         struct  work_struct     mmc_carddetect_work;
 135         void    __iomem         *base;
 136         resource_size_t         mapbase;
 137         unsigned int            id;
 138         unsigned int            dma_len;
 139         unsigned int            dma_dir;
 140         unsigned char           bus_mode;
 141         unsigned char           datadir;
 142         u32                     *buffer;
 143         u32                     bytesleft;
 144         int                     suspended;
 145         int                     irq;
 146         int                     carddetect;
 147         int                     use_dma, dma_ch;
 148         int                     initstr;
 149         int                     slot_id;
 150         int                     dbclk_enabled;
 151         struct  omap_mmc_platform_data  *pdata;
 152 };
 153
 154 /*
 155  * Stop clock to the card
 156  */
 157 static void omap_mmc_stop_clock(struct mmc_omap_host *host)
 158 {
 159         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 160                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 161         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 162                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
 163 }
 164
 165 /*
 166  * Send init stream sequence to card
 167  * before sending IDLE command
 168  */
 169 static void send_init_stream(struct mmc_omap_host *host)
 170 {
 171         int reg = 0;
 172         unsigned long timeout;
 173
 174         disable_irq(host->irq);
 175         OMAP_HSMMC_WRITE(host->base, CON,
 176                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 177         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 178
 179         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 180         while ((reg != CC) && time_before(jiffies, timeout))
 181                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
 182
 183         OMAP_HSMMC_WRITE(host->base, CON,
 184                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 185         enable_irq(host->irq);
 186 }
 187
 188 static inline
 189 int mmc_omap_cover_is_closed(struct mmc_omap_host *host)
 190 {
 191         int r = 1;
 192
 193         if (host->pdata->slots[host->slot_id].get_cover_state)
 194                 r = host->pdata->slots[host->slot_id].get_cover_state(host->dev,
 195                         host->slot_id);
 196         return r;
 197 }
 198
 199 static ssize_t
 200 mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
 201                            char *buf)
 202 {
 203         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 204         struct mmc_omap_host *host = mmc_priv(mmc);
 205
 206         return sprintf(buf, "%s\n", mmc_omap_cover_is_closed(host) ? "closed" :
 207                        "open");
 208 }
 209
 210 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
 211
 212 static ssize_t
 213 mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
 214                         char *buf)
 215 {
 216         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 217         struct mmc_omap_host *host = mmc_priv(mmc);
 218         struct omap_mmc_slot_data slot = host->pdata->slots[host->slot_id];
 219
 220         return sprintf(buf, "slot:%s\n", slot.name);
 221 }
 222
 223 static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
 224
 225 /*
 226  * Configure the response type and send the cmd.
 227  */
 228 static void
 229 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
 230         struct mmc_data *data)
 231 {
 232         int cmdreg = 0, resptype = 0, cmdtype = 0;
 233
 234         dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 235                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 236         host->cmd = cmd;
 237
 238         /*
 239          * Clear status bits and enable interrupts
 240          */
 241         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 242         OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
 243         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 244
 245         if (cmd->flags & MMC_RSP_PRESENT) {
 246                 if (cmd->flags & MMC_RSP_136)
 247                         resptype = 1;
 248                 else
 249                         resptype = 2;
 250         }
 251
 252         /*
 253          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 254          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 255          * a val of 0x3, rest 0x0.
 256          */
 257         if (cmd == host->mrq->stop)
 258                 cmdtype = 0x3;
 259
 260         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 261
 262         if (data) {
 263                 cmdreg |= DP_SELECT | MSBS | BCE;
 264                 if (data->flags & MMC_DATA_READ)
 265                         cmdreg |= DDIR;
 266                 else
 267                         cmdreg &= ~(DDIR);
 268         }
 269
 270         if (host->use_dma)
 271                 cmdreg |= DMA_EN;
 272
 273         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 274         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 275 }
 276
 277 /*
 278  * Notify the transfer complete to MMC core
 279  */
 280 static void
 281 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 282 {
 283         host->data = NULL;
 284
 285         if (host->use_dma && host->dma_ch != -1)
 286                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
 287                         host->dma_dir);
 288
 289         host->datadir = OMAP_MMC_DATADIR_NONE;
 290
 291         if (!data->error)
 292                 data->bytes_xfered += data->blocks * (data->blksz);
 293         else
 294                 data->bytes_xfered = 0;
 295
 296         if (!data->stop) {
 297                 host->mrq = NULL;
 298                 mmc_request_done(host->mmc, data->mrq);
 299                 return;
 300         }
 301         mmc_omap_start_command(host, data->stop, NULL);
 302 }
 303
 304 /*
 305  * Notify the core about command completion
 306  */
 307 static void
 308 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 309 {
 310         host->cmd = NULL;
 311
 312         if (cmd->flags & MMC_RSP_PRESENT) {
 313                 if (cmd->flags & MMC_RSP_136) {
 314                         /* response type 2 */
 315                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
 316                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
 317                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
 318                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
 319                 } else {
 320                         /* response types 1, 1b, 3, 4, 5, 6 */
 321                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
 322                 }
 323         }
 324         if (host->data == NULL || cmd->error) {
 325                 host->mrq = NULL;
 326                 mmc_request_done(host->mmc, cmd->mrq);
 327         }
 328 }
 329
 330 /*
 331  * DMA clean up for command errors
 332  */
 333 static void mmc_dma_cleanup(struct mmc_omap_host *host)
 334 {
 335         host->data->error = -ETIMEDOUT;
 336
 337         if (host->use_dma && host->dma_ch != -1) {
 338                 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
 339                         host->dma_dir);
 340                 omap_free_dma(host->dma_ch);
 341                 host->dma_ch = -1;
 342                 up(&host->sem);
 343         }
 344         host->data = NULL;
 345         host->datadir = OMAP_MMC_DATADIR_NONE;
 346 }
 347
 348 /*
 349  * Readable error output
 350  */
 351 #ifdef CONFIG_MMC_DEBUG
 352 static void mmc_omap_report_irq(struct mmc_omap_host *host, u32 status)
 353 {
 354         /* --- means reserved bit without definition at documentation */
 355         static const char *mmc_omap_status_bits[] = {
 356                 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
 357                 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
 358                 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
 359                 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
 360         };
 361         char res[256];
 362         char *buf = res;
 363         int len, i;
 364
 365         len = sprintf(buf, "MMC IRQ 0x%x :", status);
 366         buf += len;
 367
 368         for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
 369                 if (status & (1 << i)) {
 370                         len = sprintf(buf, " %s", mmc_omap_status_bits[i]);
 371                         buf += len;
 372                 }
 373
 374         dev_dbg(mmc_dev(host->mmc), "%s\n", res);
 375 }
 376 #endif  /* CONFIG_MMC_DEBUG */
 377
 378
 379 /*
 380  * MMC controller IRQ handler
 381  */
 382 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
 383 {
 384         struct mmc_omap_host *host = dev_id;
 385         struct mmc_data *data;
 386         int end_cmd = 0, end_trans = 0, status;
 387
 388         if (host->cmd == NULL && host->data == NULL) {
 389                 OMAP_HSMMC_WRITE(host->base, STAT,
 390                         OMAP_HSMMC_READ(host->base, STAT));
 391                 return IRQ_HANDLED;
 392         }
 393
 394         data = host->data;
 395         status = OMAP_HSMMC_READ(host->base, STAT);
 396         dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
 397
 398         if (status & ERR) {
 399 #ifdef CONFIG_MMC_DEBUG
 400                 mmc_omap_report_irq(host, status);
 401 #endif
 402                 if ((status & CMD_TIMEOUT) ||
 403                         (status & CMD_CRC)) {
 404                         if (host->cmd) {
 405                                 if (status & CMD_TIMEOUT) {
 406                                         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 407                                                 OMAP_HSMMC_READ(host->base,
 408                                                                 SYSCTL) | SRC);
 409                                         while (OMAP_HSMMC_READ(host->base,
 410                                                         SYSCTL) & SRC)
 411                                                 ;
 412
 413                                         host->cmd->error = -ETIMEDOUT;
 414                                 } else {
 415                                         host->cmd->error = -EILSEQ;
 416                                 }
 417                                 end_cmd = 1;
 418                         }
 419                         if (host->data)
 420                                 mmc_dma_cleanup(host);
 421                 }
 422                 if ((status & DATA_TIMEOUT) ||
 423                         (status & DATA_CRC)) {
 424                         if (host->data) {
 425                                 if (status & DATA_TIMEOUT)
 426                                         mmc_dma_cleanup(host);
 427                                 else
 428                                         host->data->error = -EILSEQ;
 429                                 OMAP_HSMMC_WRITE(host->base, SYSCTL,
 430                                         OMAP_HSMMC_READ(host->base,
 431                                                         SYSCTL) | SRD);
 432                                 while (OMAP_HSMMC_READ(host->base,
 433                                                 SYSCTL) & SRD)
 434                                         ;
 435                                 end_trans = 1;
 436                         }
 437                 }
 438                 if (status & CARD_ERR) {
 439                         dev_dbg(mmc_dev(host->mmc),
 440                                 "Ignoring card err CMD%d\n", host->cmd->opcode);
 441                         if (host->cmd)
 442                                 end_cmd = 1;
 443                         if (host->data)
 444                                 end_trans = 1;
 445                 }
 446         }
 447
 448         OMAP_HSMMC_WRITE(host->base, STAT, status);
 449
 450         if (end_cmd || (status & CC))
 451                 mmc_omap_cmd_done(host, host->cmd);
 452         if (end_trans || (status & TC))
 453                 mmc_omap_xfer_done(host, data);
 454
 455         return IRQ_HANDLED;
 456 }
 457
 458 /*
 459  * Switch MMC operating voltage
 460  */
 461 static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
 462 {
 463         u32 reg_val = 0;
 464         int ret;
 465
 466         /* Disable the clocks */
 467         clk_disable(host->fclk);
 468         clk_disable(host->iclk);
 469         clk_disable(host->dbclk);
 470
 471         /* Turn the power off */
 472         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
 473         if (ret != 0)
 474                 goto err;
 475
 476         /* Turn the power ON with given VDD 1.8 or 3.0v */
 477         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
 478         if (ret != 0)
 479                 goto err;
 480
 481         clk_enable(host->fclk);
 482         clk_enable(host->iclk);
 483         clk_enable(host->dbclk);
 484
 485         OMAP_HSMMC_WRITE(host->base, HCTL,
 486                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
 487         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
 488         /*
 489          * If a MMC dual voltage card is detected, the set_ios fn calls
 490          * this fn with VDD bit set for 1.8V. Upon card removal from the
 491          * slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
 492          *
 493          * Only MMC1 supports 3.0V.  MMC2 will not function if SDVS30 is
 494          * set in HCTL.
 495          */
 496         if (host->id == OMAP_MMC1_DEVID && (((1 << vdd) == MMC_VDD_32_33) ||
 497                                 ((1 << vdd) == MMC_VDD_33_34)))
 498                 reg_val |= SDVS30;
 499         if ((1 << vdd) == MMC_VDD_165_195)
 500                 reg_val |= SDVS18;
 501
 502         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
 503
 504         OMAP_HSMMC_WRITE(host->base, HCTL,
 505                 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 506
 507         return 0;
 508 err:
 509         dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
 510         return ret;
 511 }
 512
 513 /*
 514  * Work Item to notify the core about card insertion/removal
 515  */
 516 static void mmc_omap_detect(struct work_struct *work)
 517 {
 518         struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
 519                                                 mmc_carddetect_work);
 520
 521         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
 522         if (host->carddetect) {
 523                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
 524         } else {
 525                 OMAP_HSMMC_WRITE(host->base, SYSCTL,
 526                         OMAP_HSMMC_READ(host->base, SYSCTL) | SRD);
 527                 while (OMAP_HSMMC_READ(host->base, SYSCTL) & SRD)
 528                         ;
 529
 530                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
 531         }
 532 }
 533
 534 /*
 535  * ISR for handling card insertion and removal
 536  */
 537 static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id)
 538 {
 539         struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
 540
 541         host->carddetect = mmc_slot(host).card_detect(irq);
 542         schedule_work(&host->mmc_carddetect_work);
 543
 544         return IRQ_HANDLED;
 545 }
 546
 547 /*
 548  * DMA call back function
 549  */
 550 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
 551 {
 552         struct mmc_omap_host *host = data;
 553
 554         if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
 555                 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
 556
 557         if (host->dma_ch < 0)
 558                 return;
 559
 560         omap_free_dma(host->dma_ch);
 561         host->dma_ch = -1;
 562         /*
 563          * DMA Callback: run in interrupt context.
 564          * mutex_unlock will through a kernel warning if used.
 565          */
 566         up(&host->sem);
 567 }
 568
 569 /*
 570  * Configure dma src and destination parameters
 571  */
 572 static int mmc_omap_config_dma_param(int sync_dir, struct mmc_omap_host *host,
 573                                 struct mmc_data *data)
 574 {
 575         if (sync_dir == 0) {
 576                 omap_set_dma_dest_params(host->dma_ch, 0,
 577                         OMAP_DMA_AMODE_CONSTANT,
 578                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
 579                 omap_set_dma_src_params(host->dma_ch, 0,
 580                         OMAP_DMA_AMODE_POST_INC,
 581                         sg_dma_address(&data->sg[0]), 0, 0);
 582         } else {
 583                 omap_set_dma_src_params(host->dma_ch, 0,
 584                         OMAP_DMA_AMODE_CONSTANT,
 585                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
 586                 omap_set_dma_dest_params(host->dma_ch, 0,
 587                         OMAP_DMA_AMODE_POST_INC,
 588                         sg_dma_address(&data->sg[0]), 0, 0);
 589         }
 590         return 0;
 591 }
 592 /*
 593  * Routine to configure and start DMA for the MMC card
 594  */
 595 static int
 596 mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)
 597 {
 598         int sync_dev, sync_dir = 0;
 599         int dma_ch = 0, ret = 0, err = 1;
 600         struct mmc_data *data = req->data;
 601
 602         /*
 603          * If for some reason the DMA transfer is still active,
 604          * we wait for timeout period and free the dma
 605          */
 606         if (host->dma_ch != -1) {
 607                 set_current_state(TASK_UNINTERRUPTIBLE);
 608                 schedule_timeout(100);
 609                 if (down_trylock(&host->sem)) {
 610                         omap_free_dma(host->dma_ch);
 611                         host->dma_ch = -1;
 612                         up(&host->sem);
 613                         return err;
 614                 }
 615         } else {
 616                 if (down_trylock(&host->sem))
 617                         return err;
 618         }
 619
 620         if (!(data->flags & MMC_DATA_WRITE)) {
 621                 host->dma_dir = DMA_FROM_DEVICE;
 622                 if (host->id == OMAP_MMC1_DEVID)
 623                         sync_dev = OMAP24XX_DMA_MMC1_RX;
 624                 else
 625                         sync_dev = OMAP24XX_DMA_MMC2_RX;
 626         } else {
 627                 host->dma_dir = DMA_TO_DEVICE;
 628                 if (host->id == OMAP_MMC1_DEVID)
 629                         sync_dev = OMAP24XX_DMA_MMC1_TX;
 630                 else
 631                         sync_dev = OMAP24XX_DMA_MMC2_TX;
 632         }
 633
 634         ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb,
 635                         host, &dma_ch);
 636         if (ret != 0) {
 637                 dev_dbg(mmc_dev(host->mmc),
 638                         "%s: omap_request_dma() failed with %d\n",
 639                         mmc_hostname(host->mmc), ret);
 640                 return ret;
 641         }
 642
 643         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
 644                         data->sg_len, host->dma_dir);
 645         host->dma_ch = dma_ch;
 646
 647         if (!(data->flags & MMC_DATA_WRITE))
 648                 mmc_omap_config_dma_param(1, host, data);
 649         else
 650                 mmc_omap_config_dma_param(0, host, data);
 651
 652         if ((data->blksz % 4) == 0)
 653                 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
 654                         (data->blksz / 4), data->blocks, OMAP_DMA_SYNC_FRAME,
 655                         sync_dev, sync_dir);
 656         else
 657                 /* REVISIT: The MMC buffer increments only when MSB is written.
 658                  * Return error for blksz which is non multiple of four.
 659                  */
 660                 return -EINVAL;
 661
 662         omap_start_dma(dma_ch);
 663         return 0;
 664 }
 665
 666 static void set_data_timeout(struct mmc_omap_host *host,
 667                              struct mmc_request *req)
 668 {
 669         unsigned int timeout, cycle_ns;
 670         uint32_t reg, clkd, dto = 0;
 671
 672         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
 673         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
 674         if (clkd == 0)
 675                 clkd = 1;
 676
 677         cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
 678         timeout = req->data->timeout_ns / cycle_ns;
 679         timeout += req->data->timeout_clks;
 680         if (timeout) {
 681                 while ((timeout & 0x80000000) == 0) {
 682                         dto += 1;
 683                         timeout <<= 1;
 684                 }
 685                 dto = 31 - dto;
 686                 timeout <<= 1;
 687                 if (timeout && dto)
 688                         dto += 1;
 689                 if (dto >= 13)
 690                         dto -= 13;
 691                 else
 692                         dto = 0;
 693                 if (dto > 14)
 694                         dto = 14;
 695         }
 696
 697         reg &= ~DTO_MASK;
 698         reg |= dto << DTO_SHIFT;
 699         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
 700 }
 701
 702 /*
 703  * Configure block length for MMC/SD cards and initiate the transfer.
 704  */
 705 static int
 706 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 707 {
 708         int ret;
 709         host->data = req->data;
 710
 711         if (req->data == NULL) {
 712                 host->datadir = OMAP_MMC_DATADIR_NONE;
 713                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
 714                 return 0;
 715         }
 716
 717         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
 718                                         | (req->data->blocks << 16));
 719         set_data_timeout(host, req);
 720
 721         host->datadir = (req->data->flags & MMC_DATA_WRITE) ?
 722                         OMAP_MMC_DATADIR_WRITE : OMAP_MMC_DATADIR_READ;
 723
 724         if (host->use_dma) {
 725                 ret = mmc_omap_start_dma_transfer(host, req);
 726                 if (ret != 0) {
 727                         dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
 728                         return ret;
 729                 }
 730         }
 731         return 0;
 732 }
 733
 734 /*
 735  * Request function. for read/write operation
 736  */
 737 static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
 738 {
 739         struct mmc_omap_host *host = mmc_priv(mmc);
 740
 741         WARN_ON(host->mrq != NULL);
 742         host->mrq = req;
 743         mmc_omap_prepare_data(host, req);
 744         mmc_omap_start_command(host, req->cmd, req->data);
 745 }
 746
 747
 748 /* Routine to configure clock values. Exposed API to core */
 749 static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 750 {
 751         struct mmc_omap_host *host = mmc_priv(mmc);
 752         u16 dsor = 0;
 753         unsigned long regval;
 754         unsigned long timeout;
 755
 756         switch (ios->power_mode) {
 757         case MMC_POWER_OFF:
 758                 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
 759                 /*
 760                  * Reset bus voltage to 3V if it got set to 1.8V earlier.
 761                  * REVISIT: If we are able to detect cards after unplugging
 762                  * a 1.8V card, this code should not be needed.
 763                  */
 764                 if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
 765                         int vdd = fls(host->mmc->ocr_avail) - 1;
 766                         if (omap_mmc_switch_opcond(host, vdd) != 0)
 767                                 host->mmc->ios.vdd = vdd;
 768                 }
 769                 break;
 770         case MMC_POWER_UP:
 771                 mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
 772                 break;
 773         }
 774
 775         switch (mmc->ios.bus_width) {
 776         case MMC_BUS_WIDTH_4:
 777                 OMAP_HSMMC_WRITE(host->base, HCTL,
 778                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 779                 break;
 780         case MMC_BUS_WIDTH_1:
 781                 OMAP_HSMMC_WRITE(host->base, HCTL,
 782                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 783                 break;
 784         }
 785
 786         if (host->id == OMAP_MMC1_DEVID) {
 787                 /* Only MMC1 can operate at 3V/1.8V */
 788                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
 789                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
 790                                 /*
 791                                  * The mmc_select_voltage fn of the core does
 792                                  * not seem to set the power_mode to
 793                                  * MMC_POWER_UP upon recalculating the voltage.
 794                                  * vdd 1.8v.
 795                                  */
 796                                 if (omap_mmc_switch_opcond(host, ios->vdd) != 0)
 797                                         dev_dbg(mmc_dev(host->mmc),
 798                                                 "Switch operation failed\n");
 799                 }
 800         }
 801
 802         if (ios->clock) {
 803                 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
 804                 if (dsor < 1)
 805                         dsor = 1;
 806
 807                 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
 808                         dsor++;
 809
 810                 if (dsor > 250)
 811                         dsor = 250;
 812         }
 813         omap_mmc_stop_clock(host);
 814         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 815         regval = regval & ~(CLKD_MASK);
 816         regval = regval | (dsor << 6) | (DTO << 16);
 817         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 818         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 819                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 820
 821         /* Wait till the ICS bit is set */
 822         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 823         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2
 824                 && time_before(jiffies, timeout))
 825                 msleep(1);
 826
 827         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 828                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 829
 830         if (ios->power_mode == MMC_POWER_ON)
 831                 send_init_stream(host);
 832
 833         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 834                 OMAP_HSMMC_WRITE(host->base, CON,
 835                                 OMAP_HSMMC_READ(host->base, CON) | OD);
 836 }
 837
 838 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
 839 {
 840         struct mmc_omap_host *host = mmc_priv(mmc);
 841         struct omap_mmc_platform_data *pdata = host->pdata;
 842
 843         if (!pdata->slots[0].card_detect)
 844                 return -ENOSYS;
 845         return pdata->slots[0].card_detect(pdata->slots[0].card_detect_irq);
 846 }
 847
 848 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
 849 {
 850         struct mmc_omap_host *host = mmc_priv(mmc);
 851         struct omap_mmc_platform_data *pdata = host->pdata;
 852
 853         if (!pdata->slots[0].get_ro)
 854                 return -ENOSYS;
 855         return pdata->slots[0].get_ro(host->dev, 0);
 856 }
 857
 858 static struct mmc_host_ops mmc_omap_ops = {
 859         .request = omap_mmc_request,
 860         .set_ios = omap_mmc_set_ios,
 861         .get_cd = omap_hsmmc_get_cd,
 862         .get_ro = omap_hsmmc_get_ro,
 863         /* NYET -- enable_sdio_irq */
 864 };
 865
 866 static int __init omap_mmc_probe(struct platform_device *pdev)
 867 {
 868         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
 869         struct mmc_host *mmc;
 870         struct mmc_omap_host *host = NULL;
 871         struct resource *res;
 872         int ret = 0, irq;
 873         u32 hctl, capa;
 874
 875         if (pdata == NULL) {
 876                 dev_err(&pdev->dev, "Platform Data is missing\n");
 877                 return -ENXIO;
 878         }
 879
 880         if (pdata->nr_slots == 0) {
 881                 dev_err(&pdev->dev, "No Slots\n");
 882                 return -ENXIO;
 883         }
 884
 885         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 886         irq = platform_get_irq(pdev, 0);
 887         if (res == NULL || irq < 0)
 888                 return -ENXIO;
 889
 890         res = request_mem_region(res->start, res->end - res->start + 1,
 891                                                         pdev->name);
 892         if (res == NULL)
 893                 return -EBUSY;
 894
 895         mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
 896         if (!mmc) {
 897                 ret = -ENOMEM;
 898                 goto err;
 899         }
 900
 901         host            = mmc_priv(mmc);
 902         host->mmc       = mmc;
 903         host->pdata     = pdata;
 904         host->dev       = &pdev->dev;
 905         host->use_dma   = 1;
 906         host->dev->dma_mask = &pdata->dma_mask;
 907         host->dma_ch    = -1;
 908         host->irq       = irq;
 909         host->id        = pdev->id;
 910         host->slot_id   = 0;
 911         host->mapbase   = res->start;
 912         host->base      = ioremap(host->mapbase, SZ_4K);
 913
 914         platform_set_drvdata(pdev, host);
 915         INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
 916
 917         mmc->ops        = &mmc_omap_ops;
 918         mmc->f_min      = 400000;
 919         mmc->f_max      = 52000000;
 920
 921         sema_init(&host->sem, 1);
 922
 923         host->iclk = clk_get(&pdev->dev, "mmchs_ick");
 924         if (IS_ERR(host->iclk)) {
 925                 ret = PTR_ERR(host->iclk);
 926                 host->iclk = NULL;
 927                 goto err1;
 928         }
 929         host->fclk = clk_get(&pdev->dev, "mmchs_fck");
 930         if (IS_ERR(host->fclk)) {
 931                 ret = PTR_ERR(host->fclk);
 932                 host->fclk = NULL;
 933                 clk_put(host->iclk);
 934                 goto err1;
 935         }
 936
 937         if (clk_enable(host->fclk) != 0) {
 938                 clk_put(host->iclk);
 939                 clk_put(host->fclk);
 940                 goto err1;
 941         }
 942
 943         if (clk_enable(host->iclk) != 0) {
 944                 clk_disable(host->fclk);
 945                 clk_put(host->iclk);
 946                 clk_put(host->fclk);
 947                 goto err1;
 948         }
 949
 950         host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
 951         /*
 952          * MMC can still work without debounce clock.
 953          */
 954         if (IS_ERR(host->dbclk))
 955                 dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n");
 956         else
 957                 if (clk_enable(host->dbclk) != 0)
 958                         dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
 959                                                         " clk failed\n");
 960                 else
 961                         host->dbclk_enabled = 1;
 962
 963 #ifdef CONFIG_MMC_BLOCK_BOUNCE
 964         mmc->max_phys_segs = 1;
 965         mmc->max_hw_segs = 1;
 966 #endif
 967         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
 968         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
 969         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
 970         mmc->max_seg_size = mmc->max_req_size;
 971
 972         mmc->ocr_avail = mmc_slot(host).ocr_mask;
 973         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
 974
 975         if (pdata->slots[host->slot_id].wires >= 4)
 976                 mmc->caps |= MMC_CAP_4_BIT_DATA;
 977
 978         /* Only MMC1 supports 3.0V */
 979         if (host->id == OMAP_MMC1_DEVID) {
 980                 hctl = SDVS30;
 981                 capa = VS30 | VS18;
 982         } else {
 983                 hctl = SDVS18;
 984                 capa = VS18;
 985         }
 986
 987         OMAP_HSMMC_WRITE(host->base, HCTL,
 988                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
 989
 990         OMAP_HSMMC_WRITE(host->base, CAPA,
 991                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
 992
 993         /* Set the controller to AUTO IDLE mode */
 994         OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
 995                         OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
 996
 997         /* Set SD bus power bit */
 998         OMAP_HSMMC_WRITE(host->base, HCTL,
 999                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1000
1001         /* Request IRQ for MMC operations */
1002         ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED,
1003                         mmc_hostname(mmc), host);
1004         if (ret) {
1005                 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1006                 goto err_irq;
1007         }
1008
1009         if (pdata->init != NULL) {
1010                 if (pdata->init(&pdev->dev) != 0) {
1011                         dev_dbg(mmc_dev(host->mmc),
1012                                 "Unable to configure MMC IRQs\n");
1013                         goto err_irq_cd_init;
1014                 }
1015         }
1016
1017         /* Request IRQ for card detect */
1018         if ((mmc_slot(host).card_detect_irq) && (mmc_slot(host).card_detect)) {
1019                 ret = request_irq(mmc_slot(host).card_detect_irq,
1020                                   omap_mmc_cd_handler,
1021                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
1022                                           | IRQF_DISABLED,
1023                                   mmc_hostname(mmc), host);
1024                 if (ret) {
1025                         dev_dbg(mmc_dev(host->mmc),
1026                                 "Unable to grab MMC CD IRQ\n");
1027                         goto err_irq_cd;
1028                 }
1029         }
1030
1031         OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
1032         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
1033
1034         mmc_add_host(mmc);
1035
1036         if (host->pdata->slots[host->slot_id].name != NULL) {
1037                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1038                 if (ret < 0)
1039                         goto err_slot_name;
1040         }
1041         if (mmc_slot(host).card_detect_irq && mmc_slot(host).card_detect &&
1042                         host->pdata->slots[host->slot_id].get_cover_state) {
1043                 ret = device_create_file(&mmc->class_dev,
1044                                         &dev_attr_cover_switch);
1045                 if (ret < 0)
1046                         goto err_cover_switch;
1047         }
1048
1049         return 0;
1050
1051 err_cover_switch:
1052         device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1053 err_slot_name:
1054         mmc_remove_host(mmc);
1055 err_irq_cd:
1056         free_irq(mmc_slot(host).card_detect_irq, host);
1057 err_irq_cd_init:
1058         free_irq(host->irq, host);
1059 err_irq:
1060         clk_disable(host->fclk);
1061         clk_disable(host->iclk);
1062         clk_put(host->fclk);
1063         clk_put(host->iclk);
1064         if (host->dbclk_enabled) {
1065                 clk_disable(host->dbclk);
1066                 clk_put(host->dbclk);
1067         }
1068
1069 err1:
1070         iounmap(host->base);
1071 err:
1072         dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
1073         release_mem_region(res->start, res->end - res->start + 1);
1074         if (host)
1075                 mmc_free_host(mmc);
1076         return ret;
1077 }
1078
1079 static int omap_mmc_remove(struct platform_device *pdev)
1080 {
1081         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1082         struct resource *res;
1083
1084         if (host) {
1085                 mmc_remove_host(host->mmc);
1086                 if (host->pdata->cleanup)
1087                         host->pdata->cleanup(&pdev->dev);
1088                 free_irq(host->irq, host);
1089                 if (mmc_slot(host).card_detect_irq)
1090                         free_irq(mmc_slot(host).card_detect_irq, host);
1091                 flush_scheduled_work();
1092
1093                 clk_disable(host->fclk);
1094                 clk_disable(host->iclk);
1095                 clk_put(host->fclk);
1096                 clk_put(host->iclk);
1097                 if (host->dbclk_enabled) {
1098                         clk_disable(host->dbclk);
1099                         clk_put(host->dbclk);
1100                 }
1101
1102                 mmc_free_host(host->mmc);
1103                 iounmap(host->base);
1104         }
1105
1106         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1107         if (res)
1108                 release_mem_region(res->start, res->end - res->start + 1);
1109         platform_set_drvdata(pdev, NULL);
1110
1111         return 0;
1112 }
1113
1114 #ifdef CONFIG_PM
1115 static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
1116 {
1117         int ret = 0;
1118         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1119
1120         if (host && host->suspended)
1121                 return 0;
1122
1123         if (host) {
1124                 ret = mmc_suspend_host(host->mmc, state);
1125                 if (ret == 0) {
1126                         host->suspended = 1;
1127
1128                         OMAP_HSMMC_WRITE(host->base, ISE, 0);
1129                         OMAP_HSMMC_WRITE(host->base, IE, 0);
1130
1131                         if (host->pdata->suspend) {
1132                                 ret = host->pdata->suspend(&pdev->dev,
1133                                                                 host->slot_id);
1134                                 if (ret)
1135                                         dev_dbg(mmc_dev(host->mmc),
1136                                                 "Unable to handle MMC board"
1137                                                 " level suspend\n");
1138                         }
1139
1140                         if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
1141                                 OMAP_HSMMC_WRITE(host->base, HCTL,
1142                                         OMAP_HSMMC_READ(host->base, HCTL)
1143                                         & SDVSCLR);
1144                                 OMAP_HSMMC_WRITE(host->base, HCTL,
1145                                         OMAP_HSMMC_READ(host->base, HCTL)
1146                                         | SDVS30);
1147                                 OMAP_HSMMC_WRITE(host->base, HCTL,
1148                                         OMAP_HSMMC_READ(host->base, HCTL)
1149                                         | SDBP);
1150                         }
1151
1152                         clk_disable(host->fclk);
1153                         clk_disable(host->iclk);
1154                         clk_disable(host->dbclk);
1155                 }
1156
1157         }
1158         return ret;
1159 }
1160
1161 /* Routine to resume the MMC device */
1162 static int omap_mmc_resume(struct platform_device *pdev)
1163 {
1164         int ret = 0;
1165         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1166
1167         if (host && !host->suspended)
1168                 return 0;
1169
1170         if (host) {
1171
1172                 ret = clk_enable(host->fclk);
1173                 if (ret)
1174                         goto clk_en_err;
1175
1176                 ret = clk_enable(host->iclk);
1177                 if (ret) {
1178                         clk_disable(host->fclk);
1179                         clk_put(host->fclk);
1180                         goto clk_en_err;
1181                 }
1182
1183                 if (clk_enable(host->dbclk) != 0)
1184                         dev_dbg(mmc_dev(host->mmc),
1185                                         "Enabling debounce clk failed\n");
1186
1187                 if (host->pdata->resume) {
1188                         ret = host->pdata->resume(&pdev->dev, host->slot_id);
1189                         if (ret)
1190                                 dev_dbg(mmc_dev(host->mmc),
1191                                         "Unmask interrupt failed\n");
1192                 }
1193
1194                 /* Notify the core to resume the host */
1195                 ret = mmc_resume_host(host->mmc);
1196                 if (ret == 0)
1197                         host->suspended = 0;
1198         }
1199
1200         return ret;
1201
1202 clk_en_err:
1203         dev_dbg(mmc_dev(host->mmc),
1204                 "Failed to enable MMC clocks during resume\n");
1205         return ret;
1206 }
1207
1208 #else
1209 #define omap_mmc_suspend        NULL
1210 #define omap_mmc_resume         NULL
1211 #endif
1212
1213 static struct platform_driver omap_mmc_driver = {
1214         .probe          = omap_mmc_probe,
1215         .remove         = omap_mmc_remove,
1216         .suspend        = omap_mmc_suspend,
1217         .resume         = omap_mmc_resume,
1218         .driver         = {
1219                 .name = DRIVER_NAME,
1220                 .owner = THIS_MODULE,
1221         },
1222 };
1223
1224 static int __init omap_mmc_init(void)
1225 {
1226         /* Register the MMC driver */
1227         return platform_driver_register(&omap_mmc_driver);
1228 }
1229
1230 static void __exit omap_mmc_cleanup(void)
1231 {
1232         /* Unregister MMC driver */
1233         platform_driver_unregister(&omap_mmc_driver);
1234 }
1235
1236 module_init(omap_mmc_init);
1237 module_exit(omap_mmc_cleanup);
1238
1239 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
1240 MODULE_LICENSE("GPL");
1241 MODULE_ALIAS("platform:" DRIVER_NAME);
1242 MODULE_AUTHOR("Texas Instruments Inc");