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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 SDVS33                  (0x7 << 9)
  59 #define SDVSCLR                 0xFFFFF1FF
  60 #define SDVSDET                 0x00000400
  61 #define AUTOIDLE                0x1
  62 #define SDBP                    (1 << 8)
  63 #define DTO                     0xe
  64 #define ICE                     0x1
  65 #define ICS                     0x2
  66 #define CEN                     (1 << 2)
  67 #define CLKD_MASK               0x0000FFC0
  68 #define CLKD_SHIFT              6
  69 #define DTO_MASK                0x000F0000
  70 #define DTO_SHIFT               16
  71 #define INT_EN_MASK             0x307F0033
  72 #define INIT_STREAM             (1 << 1)
  73 #define DP_SELECT               (1 << 21)
  74 #define DDIR                    (1 << 4)
  75 #define DMA_EN                  0x1
  76 #define MSBS                    (1 << 5)
  77 #define BCE                     (1 << 1)
  78 #define FOUR_BIT                (1 << 1)
  79 #define CC                      0x1
  80 #define TC                      0x02
  81 #define OD                      0x1
  82 #define ERR                     (1 << 15)
  83 #define CMD_TIMEOUT             (1 << 16)
  84 #define DATA_TIMEOUT            (1 << 20)
  85 #define CMD_CRC                 (1 << 17)
  86 #define DATA_CRC                (1 << 21)
  87 #define CARD_ERR                (1 << 28)
  88 #define STAT_CLEAR              0xFFFFFFFF
  89 #define INIT_STREAM_CMD         0x00000000
  90 #define DUAL_VOLT_OCR_BIT       7
  91 #define SRC                     (1 << 25)
  92 #define SRD                     (1 << 26)
  93
  94 /*
  95  * FIXME: Most likely all the data using these _DEVID defines should come
  96  * from the platform_data, or implemented in controller and slot specific
  97  * functions.
  98  */
  99 #define OMAP_MMC1_DEVID         0
 100 #define OMAP_MMC2_DEVID         1
 101
 102 #define OMAP_MMC_DATADIR_NONE   0
 103 #define OMAP_MMC_DATADIR_READ   1
 104 #define OMAP_MMC_DATADIR_WRITE  2
 105 #define MMC_TIMEOUT_MS          20
 106 #define OMAP_MMC_MASTER_CLOCK   96000000
 107 #define DRIVER_NAME             "mmci-omap-hs"
 108
 109 /*
 110  * One controller can have multiple slots, like on some omap boards using
 111  * omap.c controller driver. Luckily this is not currently done on any known
 112  * omap_hsmmc.c device.
 113  */
 114 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
 115
 116 /*
 117  * MMC Host controller read/write API's
 118  */
 119 #define OMAP_HSMMC_READ(base, reg)      \
 120         __raw_readl((base) + OMAP_HSMMC_##reg)
 121
 122 #define OMAP_HSMMC_WRITE(base, reg, val) \
 123         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
 124
 125 struct mmc_omap_host {
 126         struct  device          *dev;
 127         struct  mmc_host        *mmc;
 128         struct  mmc_request     *mrq;
 129         struct  mmc_command     *cmd;
 130         struct  mmc_data        *data;
 131         struct  clk             *fclk;
 132         struct  clk             *iclk;
 133         struct  clk             *dbclk;
 134         struct  semaphore       sem;
 135         struct  work_struct     mmc_carddetect_work;
 136         void    __iomem         *base;
 137         resource_size_t         mapbase;
 138         unsigned int            id;
 139         unsigned int            dma_len;
 140         unsigned int            dma_dir;
 141         unsigned char           bus_mode;
 142         unsigned char           datadir;
 143         u32                     *buffer;
 144         u32                     bytesleft;
 145         int                     suspended;
 146         int                     irq;
 147         int                     carddetect;
 148         int                     use_dma, dma_ch;
 149         int                     initstr;
 150         int                     slot_id;
 151         int                     dbclk_enabled;
 152         struct  omap_mmc_platform_data  *pdata;
 153 };
 154
 155 /*
 156  * Stop clock to the card
 157  */
 158 static void omap_mmc_stop_clock(struct mmc_omap_host *host)
 159 {
 160         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 161                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 162         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 163                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
 164 }
 165
 166 /*
 167  * Send init stream sequence to card
 168  * before sending IDLE command
 169  */
 170 static void send_init_stream(struct mmc_omap_host *host)
 171 {
 172         int reg = 0;
 173         unsigned long timeout;
 174
 175         disable_irq(host->irq);
 176         OMAP_HSMMC_WRITE(host->base, CON,
 177                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 178         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 179
 180         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 181         while ((reg != CC) && time_before(jiffies, timeout))
 182                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
 183
 184         OMAP_HSMMC_WRITE(host->base, CON,
 185                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 186         enable_irq(host->irq);
 187 }
 188
 189 static inline
 190 int mmc_omap_cover_is_closed(struct mmc_omap_host *host)
 191 {
 192         int r = 1;
 193
 194         if (host->pdata->slots[host->slot_id].get_cover_state)
 195                 r = host->pdata->slots[host->slot_id].get_cover_state(host->dev,
 196                         host->slot_id);
 197         return r;
 198 }
 199
 200 static ssize_t
 201 mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
 202                            char *buf)
 203 {
 204         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 205         struct mmc_omap_host *host = mmc_priv(mmc);
 206
 207         return sprintf(buf, "%s\n", mmc_omap_cover_is_closed(host) ? "closed" :
 208                        "open");
 209 }
 210
 211 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
 212
 213 static ssize_t
 214 mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
 215                         char *buf)
 216 {
 217         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 218         struct mmc_omap_host *host = mmc_priv(mmc);
 219         struct omap_mmc_slot_data slot = host->pdata->slots[host->slot_id];
 220
 221         return sprintf(buf, "slot:%s\n", slot.name);
 222 }
 223
 224 static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
 225
 226 /*
 227  * Configure the response type and send the cmd.
 228  */
 229 static void
 230 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
 231         struct mmc_data *data)
 232 {
 233         int cmdreg = 0, resptype = 0, cmdtype = 0;
 234
 235         dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 236                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 237         host->cmd = cmd;
 238
 239         /*
 240          * Clear status bits and enable interrupts
 241          */
 242         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 243         OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
 244         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 245
 246         if (cmd->flags & MMC_RSP_PRESENT) {
 247                 if (cmd->flags & MMC_RSP_136)
 248                         resptype = 1;
 249                 else
 250                         resptype = 2;
 251         }
 252
 253         /*
 254          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 255          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 256          * a val of 0x3, rest 0x0.
 257          */
 258         if (cmd == host->mrq->stop)
 259                 cmdtype = 0x3;
 260
 261         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 262
 263         if (data) {
 264                 cmdreg |= DP_SELECT | MSBS | BCE;
 265                 if (data->flags & MMC_DATA_READ)
 266                         cmdreg |= DDIR;
 267                 else
 268                         cmdreg &= ~(DDIR);
 269         }
 270
 271         if (host->use_dma)
 272                 cmdreg |= DMA_EN;
 273
 274         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 275         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 276 }
 277
 278 /*
 279  * Notify the transfer complete to MMC core
 280  */
 281 static void
 282 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 283 {
 284         host->data = NULL;
 285
 286         if (host->use_dma && host->dma_ch != -1)
 287                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
 288                         host->dma_dir);
 289
 290         host->datadir = OMAP_MMC_DATADIR_NONE;
 291
 292         if (!data->error)
 293                 data->bytes_xfered += data->blocks * (data->blksz);
 294         else
 295                 data->bytes_xfered = 0;
 296
 297         if (!data->stop) {
 298                 host->mrq = NULL;
 299                 mmc_request_done(host->mmc, data->mrq);
 300                 return;
 301         }
 302         mmc_omap_start_command(host, data->stop, NULL);
 303 }
 304
 305 /*
 306  * Notify the core about command completion
 307  */
 308 static void
 309 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 310 {
 311         host->cmd = NULL;
 312
 313         if (cmd->flags & MMC_RSP_PRESENT) {
 314                 if (cmd->flags & MMC_RSP_136) {
 315                         /* response type 2 */
 316                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
 317                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
 318                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
 319                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
 320                 } else {
 321                         /* response types 1, 1b, 3, 4, 5, 6 */
 322                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
 323                 }
 324         }
 325         if (host->data == NULL || cmd->error) {
 326                 host->mrq = NULL;
 327                 mmc_request_done(host->mmc, cmd->mrq);
 328         }
 329 }
 330
 331 /*
 332  * DMA clean up for command errors
 333  */
 334 static void mmc_dma_cleanup(struct mmc_omap_host *host)
 335 {
 336         host->data->error = -ETIMEDOUT;
 337
 338         if (host->use_dma && host->dma_ch != -1) {
 339                 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
 340                         host->dma_dir);
 341                 omap_free_dma(host->dma_ch);
 342                 host->dma_ch = -1;
 343                 up(&host->sem);
 344         }
 345         host->data = NULL;
 346         host->datadir = OMAP_MMC_DATADIR_NONE;
 347 }
 348
 349 /*
 350  * Readable error output
 351  */
 352 #ifdef CONFIG_MMC_DEBUG
 353 static void mmc_omap_report_irq(struct mmc_omap_host *host, u32 status)
 354 {
 355         /* --- means reserved bit without definition at documentation */
 356         static const char *mmc_omap_status_bits[] = {
 357                 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
 358                 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
 359                 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
 360                 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
 361         };
 362         char res[256];
 363         char *buf = res;
 364         int len, i;
 365
 366         len = sprintf(buf, "MMC IRQ 0x%x :", status);
 367         buf += len;
 368
 369         for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
 370                 if (status & (1 << i)) {
 371                         len = sprintf(buf, " %s", mmc_omap_status_bits[i]);
 372                         buf += len;
 373                 }
 374
 375         dev_dbg(mmc_dev(host->mmc), "%s\n", res);
 376 }
 377 #endif  /* CONFIG_MMC_DEBUG */
 378
 379 /*
 380  * MMC controller internal state machines reset
 381  *
 382  * Used to reset command or data internal state machines, using respectively
 383  *  SRC or SRD bit of SYSCTL register
 384  * Can be called from interrupt context
 385  */
 386 static inline void mmc_omap_reset_controller_fsm(struct mmc_omap_host *host,
 387                 unsigned long bit)
 388 {
 389         unsigned long i = 0;
 390         unsigned long limit = (loops_per_jiffy *
 391                                 msecs_to_jiffies(MMC_TIMEOUT_MS));
 392
 393         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 394                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
 395
 396         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
 397                 (i++ < limit))
 398                 cpu_relax();
 399
 400         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
 401                 dev_err(mmc_dev(host->mmc),
 402                         "Timeout waiting on controller reset in %s\n",
 403                         __func__);
 404 }
 405
 406 /*
 407  * MMC controller IRQ handler
 408  */
 409 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
 410 {
 411         struct mmc_omap_host *host = dev_id;
 412         struct mmc_data *data;
 413         int end_cmd = 0, end_trans = 0, status;
 414
 415         if (host->cmd == NULL && host->data == NULL) {
 416                 OMAP_HSMMC_WRITE(host->base, STAT,
 417                         OMAP_HSMMC_READ(host->base, STAT));
 418                 return IRQ_HANDLED;
 419         }
 420
 421         data = host->data;
 422         status = OMAP_HSMMC_READ(host->base, STAT);
 423         dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
 424
 425         if (status & ERR) {
 426 #ifdef CONFIG_MMC_DEBUG
 427                 mmc_omap_report_irq(host, status);
 428 #endif
 429                 if ((status & CMD_TIMEOUT) ||
 430                         (status & CMD_CRC)) {
 431                         if (host->cmd) {
 432                                 if (status & CMD_TIMEOUT) {
 433                                         mmc_omap_reset_controller_fsm(host, SRC);
 434                                         host->cmd->error = -ETIMEDOUT;
 435                                 } else {
 436                                         host->cmd->error = -EILSEQ;
 437                                 }
 438                                 end_cmd = 1;
 439                         }
 440                         if (host->data) {
 441                                 mmc_dma_cleanup(host);
 442                                 mmc_omap_reset_controller_fsm(host, SRD);
 443                         }
 444                 }
 445                 if ((status & DATA_TIMEOUT) ||
 446                         (status & DATA_CRC)) {
 447                         if (host->data) {
 448                                 if (status & DATA_TIMEOUT)
 449                                         mmc_dma_cleanup(host);
 450                                 else
 451                                         host->data->error = -EILSEQ;
 452                                 mmc_omap_reset_controller_fsm(host, SRD);
 453                                 end_trans = 1;
 454                         }
 455                 }
 456                 if (status & CARD_ERR) {
 457                         dev_dbg(mmc_dev(host->mmc),
 458                                 "Ignoring card err CMD%d\n", host->cmd->opcode);
 459                         if (host->cmd)
 460                                 end_cmd = 1;
 461                         if (host->data)
 462                                 end_trans = 1;
 463                 }
 464         }
 465
 466         OMAP_HSMMC_WRITE(host->base, STAT, status);
 467
 468         if (end_cmd || (status & CC))
 469                 mmc_omap_cmd_done(host, host->cmd);
 470         if (end_trans || (status & TC))
 471                 mmc_omap_xfer_done(host, data);
 472
 473         return IRQ_HANDLED;
 474 }
 475
 476 /*
 477  * Switch MMC interface voltage ... only relevant for MMC1.
 478  *
 479  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
 480  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
 481  * Some chips, like eMMC ones, use internal transceivers.
 482  */
 483 static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
 484 {
 485         u32 reg_val = 0;
 486         int ret;
 487
 488         if (host->id != OMAP_MMC1_DEVID)
 489                 return 0;
 490
 491         /* Disable the clocks */
 492         clk_disable(host->fclk);
 493         clk_disable(host->iclk);
 494         clk_disable(host->dbclk);
 495
 496         /* Turn the power off */
 497         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
 498         if (ret != 0)
 499                 goto err;
 500
 501         /* Turn the power ON with given VDD 1.8 or 3.0v */
 502         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
 503         if (ret != 0)
 504                 goto err;
 505
 506         clk_enable(host->fclk);
 507         clk_enable(host->iclk);
 508         clk_enable(host->dbclk);
 509
 510         OMAP_HSMMC_WRITE(host->base, HCTL,
 511                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
 512         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
 513
 514         /*
 515          * If a MMC dual voltage card is detected, the set_ios fn calls
 516          * this fn with VDD bit set for 1.8V. Upon card removal from the
 517          * slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
 518          *
 519          * Cope with a bit of slop in the range ... per data sheets:
 520          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
 521          *    but recommended values are 1.71V to 1.89V
 522          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
 523          *    but recommended values are 2.7V to 3.3V
 524          *
 525          * Board setup code shouldn't permit anything very out-of-range.
 526          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
 527          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
 528          */
 529         if ((1 << vdd) <= MMC_VDD_23_24)
 530                 reg_val |= SDVS18;
 531         else
 532                 reg_val |= SDVS30;
 533
 534         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
 535
 536         OMAP_HSMMC_WRITE(host->base, HCTL,
 537                 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 538
 539         return 0;
 540 err:
 541         dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
 542         return ret;
 543 }
 544
 545 /*
 546  * Work Item to notify the core about card insertion/removal
 547  */
 548 static void mmc_omap_detect(struct work_struct *work)
 549 {
 550         struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
 551                                                 mmc_carddetect_work);
 552         struct omap_mmc_slot_data *slot = &mmc_slot(host);
 553
 554         host->carddetect = slot->card_detect(slot->card_detect_irq);
 555
 556         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
 557         if (host->carddetect) {
 558                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
 559         } else {
 560                 mmc_omap_reset_controller_fsm(host, SRD);
 561                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
 562         }
 563 }
 564
 565 /*
 566  * ISR for handling card insertion and removal
 567  */
 568 static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id)
 569 {
 570         struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
 571
 572         schedule_work(&host->mmc_carddetect_work);
 573
 574         return IRQ_HANDLED;
 575 }
 576
 577 /*
 578  * DMA call back function
 579  */
 580 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
 581 {
 582         struct mmc_omap_host *host = data;
 583
 584         if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
 585                 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
 586
 587         if (host->dma_ch < 0)
 588                 return;
 589
 590         omap_free_dma(host->dma_ch);
 591         host->dma_ch = -1;
 592         /*
 593          * DMA Callback: run in interrupt context.
 594          * mutex_unlock will through a kernel warning if used.
 595          */
 596         up(&host->sem);
 597 }
 598
 599 /*
 600  * Configure dma src and destination parameters
 601  */
 602 static int mmc_omap_config_dma_param(int sync_dir, struct mmc_omap_host *host,
 603                                 struct mmc_data *data)
 604 {
 605         if (sync_dir == 0) {
 606                 omap_set_dma_dest_params(host->dma_ch, 0,
 607                         OMAP_DMA_AMODE_CONSTANT,
 608                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
 609                 omap_set_dma_src_params(host->dma_ch, 0,
 610                         OMAP_DMA_AMODE_POST_INC,
 611                         sg_dma_address(&data->sg[0]), 0, 0);
 612         } else {
 613                 omap_set_dma_src_params(host->dma_ch, 0,
 614                         OMAP_DMA_AMODE_CONSTANT,
 615                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
 616                 omap_set_dma_dest_params(host->dma_ch, 0,
 617                         OMAP_DMA_AMODE_POST_INC,
 618                         sg_dma_address(&data->sg[0]), 0, 0);
 619         }
 620         return 0;
 621 }
 622 /*
 623  * Routine to configure and start DMA for the MMC card
 624  */
 625 static int
 626 mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)
 627 {
 628         int sync_dev, sync_dir = 0;
 629         int dma_ch = 0, ret = 0, err = 1;
 630         struct mmc_data *data = req->data;
 631
 632         /*
 633          * If for some reason the DMA transfer is still active,
 634          * we wait for timeout period and free the dma
 635          */
 636         if (host->dma_ch != -1) {
 637                 set_current_state(TASK_UNINTERRUPTIBLE);
 638                 schedule_timeout(100);
 639                 if (down_trylock(&host->sem)) {
 640                         omap_free_dma(host->dma_ch);
 641                         host->dma_ch = -1;
 642                         up(&host->sem);
 643                         return err;
 644                 }
 645         } else {
 646                 if (down_trylock(&host->sem))
 647                         return err;
 648         }
 649
 650         if (!(data->flags & MMC_DATA_WRITE)) {
 651                 host->dma_dir = DMA_FROM_DEVICE;
 652                 if (host->id == OMAP_MMC1_DEVID)
 653                         sync_dev = OMAP24XX_DMA_MMC1_RX;
 654                 else
 655                         sync_dev = OMAP24XX_DMA_MMC2_RX;
 656         } else {
 657                 host->dma_dir = DMA_TO_DEVICE;
 658                 if (host->id == OMAP_MMC1_DEVID)
 659                         sync_dev = OMAP24XX_DMA_MMC1_TX;
 660                 else
 661                         sync_dev = OMAP24XX_DMA_MMC2_TX;
 662         }
 663
 664         ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb,
 665                         host, &dma_ch);
 666         if (ret != 0) {
 667                 dev_dbg(mmc_dev(host->mmc),
 668                         "%s: omap_request_dma() failed with %d\n",
 669                         mmc_hostname(host->mmc), ret);
 670                 return ret;
 671         }
 672
 673         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
 674                         data->sg_len, host->dma_dir);
 675         host->dma_ch = dma_ch;
 676
 677         if (!(data->flags & MMC_DATA_WRITE))
 678                 mmc_omap_config_dma_param(1, host, data);
 679         else
 680                 mmc_omap_config_dma_param(0, host, data);
 681
 682         if ((data->blksz % 4) == 0)
 683                 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
 684                         (data->blksz / 4), data->blocks, OMAP_DMA_SYNC_FRAME,
 685                         sync_dev, sync_dir);
 686         else
 687                 /* REVISIT: The MMC buffer increments only when MSB is written.
 688                  * Return error for blksz which is non multiple of four.
 689                  */
 690                 return -EINVAL;
 691
 692         omap_start_dma(dma_ch);
 693         return 0;
 694 }
 695
 696 static void set_data_timeout(struct mmc_omap_host *host,
 697                              struct mmc_request *req)
 698 {
 699         unsigned int timeout, cycle_ns;
 700         uint32_t reg, clkd, dto = 0;
 701
 702         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
 703         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
 704         if (clkd == 0)
 705                 clkd = 1;
 706
 707         cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
 708         timeout = req->data->timeout_ns / cycle_ns;
 709         timeout += req->data->timeout_clks;
 710         if (timeout) {
 711                 while ((timeout & 0x80000000) == 0) {
 712                         dto += 1;
 713                         timeout <<= 1;
 714                 }
 715                 dto = 31 - dto;
 716                 timeout <<= 1;
 717                 if (timeout && dto)
 718                         dto += 1;
 719                 if (dto >= 13)
 720                         dto -= 13;
 721                 else
 722                         dto = 0;
 723                 if (dto > 14)
 724                         dto = 14;
 725         }
 726
 727         reg &= ~DTO_MASK;
 728         reg |= dto << DTO_SHIFT;
 729         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
 730 }
 731
 732 /*
 733  * Configure block length for MMC/SD cards and initiate the transfer.
 734  */
 735 static int
 736 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 737 {
 738         int ret;
 739         host->data = req->data;
 740
 741         if (req->data == NULL) {
 742                 host->datadir = OMAP_MMC_DATADIR_NONE;
 743                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
 744                 return 0;
 745         }
 746
 747         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
 748                                         | (req->data->blocks << 16));
 749         set_data_timeout(host, req);
 750
 751         host->datadir = (req->data->flags & MMC_DATA_WRITE) ?
 752                         OMAP_MMC_DATADIR_WRITE : OMAP_MMC_DATADIR_READ;
 753
 754         if (host->use_dma) {
 755                 ret = mmc_omap_start_dma_transfer(host, req);
 756                 if (ret != 0) {
 757                         dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
 758                         return ret;
 759                 }
 760         }
 761         return 0;
 762 }
 763
 764 /*
 765  * Request function. for read/write operation
 766  */
 767 static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
 768 {
 769         struct mmc_omap_host *host = mmc_priv(mmc);
 770
 771         WARN_ON(host->mrq != NULL);
 772         host->mrq = req;
 773         mmc_omap_prepare_data(host, req);
 774         mmc_omap_start_command(host, req->cmd, req->data);
 775 }
 776
 777
 778 /* Routine to configure clock values. Exposed API to core */
 779 static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 780 {
 781         struct mmc_omap_host *host = mmc_priv(mmc);
 782         u16 dsor = 0;
 783         unsigned long regval;
 784         unsigned long timeout;
 785
 786         switch (ios->power_mode) {
 787         case MMC_POWER_OFF:
 788                 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
 789                 /*
 790                  * Reset interface voltage to 3V if it's 1.8V now;
 791                  * only relevant on MMC-1, the others always use 1.8V.
 792                  *
 793                  * REVISIT: If we are able to detect cards after unplugging
 794                  * a 1.8V card, this code should not be needed.
 795                  */
 796                 if (host->id != OMAP_MMC1_DEVID)
 797                         break;
 798                 if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
 799                         int vdd = fls(host->mmc->ocr_avail) - 1;
 800                         if (omap_mmc_switch_opcond(host, vdd) != 0)
 801                                 host->mmc->ios.vdd = vdd;
 802                 }
 803                 break;
 804         case MMC_POWER_UP:
 805                 mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
 806                 break;
 807         }
 808
 809         switch (mmc->ios.bus_width) {
 810         case MMC_BUS_WIDTH_4:
 811                 OMAP_HSMMC_WRITE(host->base, HCTL,
 812                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 813                 break;
 814         case MMC_BUS_WIDTH_1:
 815                 OMAP_HSMMC_WRITE(host->base, HCTL,
 816                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 817                 break;
 818         }
 819
 820         if (host->id == OMAP_MMC1_DEVID) {
 821                 /* Only MMC1 can interface at 3V without some flavor
 822                  * of external transceiver; but they all handle 1.8V.
 823                  */
 824                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
 825                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
 826                                 /*
 827                                  * The mmc_select_voltage fn of the core does
 828                                  * not seem to set the power_mode to
 829                                  * MMC_POWER_UP upon recalculating the voltage.
 830                                  * vdd 1.8v.
 831                                  */
 832                                 if (omap_mmc_switch_opcond(host, ios->vdd) != 0)
 833                                         dev_dbg(mmc_dev(host->mmc),
 834                                                 "Switch operation failed\n");
 835                 }
 836         }
 837
 838         if (ios->clock) {
 839                 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
 840                 if (dsor < 1)
 841                         dsor = 1;
 842
 843                 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
 844                         dsor++;
 845
 846                 if (dsor > 250)
 847                         dsor = 250;
 848         }
 849         omap_mmc_stop_clock(host);
 850         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 851         regval = regval & ~(CLKD_MASK);
 852         regval = regval | (dsor << 6) | (DTO << 16);
 853         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 854         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 855                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 856
 857         /* Wait till the ICS bit is set */
 858         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 859         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2
 860                 && time_before(jiffies, timeout))
 861                 msleep(1);
 862
 863         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 864                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 865
 866         if (ios->power_mode == MMC_POWER_ON)
 867                 send_init_stream(host);
 868
 869         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 870                 OMAP_HSMMC_WRITE(host->base, CON,
 871                                 OMAP_HSMMC_READ(host->base, CON) | OD);
 872 }
 873
 874 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
 875 {
 876         struct mmc_omap_host *host = mmc_priv(mmc);
 877         struct omap_mmc_platform_data *pdata = host->pdata;
 878
 879         if (!pdata->slots[0].card_detect)
 880                 return -ENOSYS;
 881         return pdata->slots[0].card_detect(pdata->slots[0].card_detect_irq);
 882 }
 883
 884 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
 885 {
 886         struct mmc_omap_host *host = mmc_priv(mmc);
 887         struct omap_mmc_platform_data *pdata = host->pdata;
 888
 889         if (!pdata->slots[0].get_ro)
 890                 return -ENOSYS;
 891         return pdata->slots[0].get_ro(host->dev, 0);
 892 }
 893
 894 static struct mmc_host_ops mmc_omap_ops = {
 895         .request = omap_mmc_request,
 896         .set_ios = omap_mmc_set_ios,
 897         .get_cd = omap_hsmmc_get_cd,
 898         .get_ro = omap_hsmmc_get_ro,
 899         /* NYET -- enable_sdio_irq */
 900 };
 901
 902 static int __init omap_mmc_probe(struct platform_device *pdev)
 903 {
 904         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
 905         struct mmc_host *mmc;
 906         struct mmc_omap_host *host = NULL;
 907         struct resource *res;
 908         int ret = 0, irq;
 909         u32 hctl, capa;
 910
 911         if (pdata == NULL) {
 912                 dev_err(&pdev->dev, "Platform Data is missing\n");
 913                 return -ENXIO;
 914         }
 915
 916         if (pdata->nr_slots == 0) {
 917                 dev_err(&pdev->dev, "No Slots\n");
 918                 return -ENXIO;
 919         }
 920
 921         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 922         irq = platform_get_irq(pdev, 0);
 923         if (res == NULL || irq < 0)
 924                 return -ENXIO;
 925
 926         res = request_mem_region(res->start, res->end - res->start + 1,
 927                                                         pdev->name);
 928         if (res == NULL)
 929                 return -EBUSY;
 930
 931         mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
 932         if (!mmc) {
 933                 ret = -ENOMEM;
 934                 goto err;
 935         }
 936
 937         host            = mmc_priv(mmc);
 938         host->mmc       = mmc;
 939         host->pdata     = pdata;
 940         host->dev       = &pdev->dev;
 941         host->use_dma   = 1;
 942         host->dev->dma_mask = &pdata->dma_mask;
 943         host->dma_ch    = -1;
 944         host->irq       = irq;
 945         host->id        = pdev->id;
 946         host->slot_id   = 0;
 947         host->mapbase   = res->start;
 948         host->base      = ioremap(host->mapbase, SZ_4K);
 949
 950         platform_set_drvdata(pdev, host);
 951         INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
 952
 953         mmc->ops        = &mmc_omap_ops;
 954         mmc->f_min      = 400000;
 955         mmc->f_max      = 52000000;
 956
 957         sema_init(&host->sem, 1);
 958
 959         host->iclk = clk_get(&pdev->dev, "ick");
 960         if (IS_ERR(host->iclk)) {
 961                 ret = PTR_ERR(host->iclk);
 962                 host->iclk = NULL;
 963                 goto err1;
 964         }
 965         host->fclk = clk_get(&pdev->dev, "fck");
 966         if (IS_ERR(host->fclk)) {
 967                 ret = PTR_ERR(host->fclk);
 968                 host->fclk = NULL;
 969                 clk_put(host->iclk);
 970                 goto err1;
 971         }
 972
 973         if (clk_enable(host->fclk) != 0) {
 974                 clk_put(host->iclk);
 975                 clk_put(host->fclk);
 976                 goto err1;
 977         }
 978
 979         if (clk_enable(host->iclk) != 0) {
 980                 clk_disable(host->fclk);
 981                 clk_put(host->iclk);
 982                 clk_put(host->fclk);
 983                 goto err1;
 984         }
 985
 986         host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
 987         /*
 988          * MMC can still work without debounce clock.
 989          */
 990         if (IS_ERR(host->dbclk))
 991                 dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n");
 992         else
 993                 if (clk_enable(host->dbclk) != 0)
 994                         dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
 995                                                         " clk failed\n");
 996                 else
 997                         host->dbclk_enabled = 1;
 998
 999 #ifdef CONFIG_MMC_BLOCK_BOUNCE
1000         mmc->max_phys_segs = 1;
1001         mmc->max_hw_segs = 1;
1002 #endif
1003         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
1004         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
1005         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1006         mmc->max_seg_size = mmc->max_req_size;
1007
1008         mmc->ocr_avail = mmc_slot(host).ocr_mask;
1009         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
1010
1011         if (pdata->slots[host->slot_id].wires >= 4)
1012                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1013
1014         /* Only MMC1 supports 3.0V */
1015         if (host->id == OMAP_MMC1_DEVID) {
1016                 hctl = SDVS30;
1017                 capa = VS30 | VS18;
1018         } else {
1019                 hctl = SDVS18;
1020                 capa = VS18;
1021         }
1022
1023         OMAP_HSMMC_WRITE(host->base, HCTL,
1024                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
1025
1026         OMAP_HSMMC_WRITE(host->base, CAPA,
1027                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
1028
1029         /* Set the controller to AUTO IDLE mode */
1030         OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
1031                         OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
1032
1033         /* Set SD bus power bit */
1034         OMAP_HSMMC_WRITE(host->base, HCTL,
1035                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1036
1037         /* Request IRQ for MMC operations */
1038         ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED,
1039                         mmc_hostname(mmc), host);
1040         if (ret) {
1041                 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1042                 goto err_irq;
1043         }
1044
1045         if (pdata->init != NULL) {
1046                 if (pdata->init(&pdev->dev) != 0) {
1047                         dev_dbg(mmc_dev(host->mmc),
1048                                 "Unable to configure MMC IRQs\n");
1049                         goto err_irq_cd_init;
1050                 }
1051         }
1052
1053         /* Request IRQ for card detect */
1054         if ((mmc_slot(host).card_detect_irq) && (mmc_slot(host).card_detect)) {
1055                 ret = request_irq(mmc_slot(host).card_detect_irq,
1056                                   omap_mmc_cd_handler,
1057                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
1058                                           | IRQF_DISABLED,
1059                                   mmc_hostname(mmc), host);
1060                 if (ret) {
1061                         dev_dbg(mmc_dev(host->mmc),
1062                                 "Unable to grab MMC CD IRQ\n");
1063                         goto err_irq_cd;
1064                 }
1065         }
1066
1067         OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
1068         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
1069
1070         mmc_add_host(mmc);
1071
1072         if (host->pdata->slots[host->slot_id].name != NULL) {
1073                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1074                 if (ret < 0)
1075                         goto err_slot_name;
1076         }
1077         if (mmc_slot(host).card_detect_irq && mmc_slot(host).card_detect &&
1078                         host->pdata->slots[host->slot_id].get_cover_state) {
1079                 ret = device_create_file(&mmc->class_dev,
1080                                         &dev_attr_cover_switch);
1081                 if (ret < 0)
1082                         goto err_cover_switch;
1083         }
1084
1085         return 0;
1086
1087 err_cover_switch:
1088         device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1089 err_slot_name:
1090         mmc_remove_host(mmc);
1091 err_irq_cd:
1092         free_irq(mmc_slot(host).card_detect_irq, host);
1093 err_irq_cd_init:
1094         free_irq(host->irq, host);
1095 err_irq:
1096         clk_disable(host->fclk);
1097         clk_disable(host->iclk);
1098         clk_put(host->fclk);
1099         clk_put(host->iclk);
1100         if (host->dbclk_enabled) {
1101                 clk_disable(host->dbclk);
1102                 clk_put(host->dbclk);
1103         }
1104
1105 err1:
1106         iounmap(host->base);
1107 err:
1108         dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
1109         release_mem_region(res->start, res->end - res->start + 1);
1110         if (host)
1111                 mmc_free_host(mmc);
1112         return ret;
1113 }
1114
1115 static int omap_mmc_remove(struct platform_device *pdev)
1116 {
1117         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1118         struct resource *res;
1119
1120         if (host) {
1121                 mmc_remove_host(host->mmc);
1122                 if (host->pdata->cleanup)
1123                         host->pdata->cleanup(&pdev->dev);
1124                 free_irq(host->irq, host);
1125                 if (mmc_slot(host).card_detect_irq)
1126                         free_irq(mmc_slot(host).card_detect_irq, host);
1127                 flush_scheduled_work();
1128
1129                 clk_disable(host->fclk);
1130                 clk_disable(host->iclk);
1131                 clk_put(host->fclk);
1132                 clk_put(host->iclk);
1133                 if (host->dbclk_enabled) {
1134                         clk_disable(host->dbclk);
1135                         clk_put(host->dbclk);
1136                 }
1137
1138                 mmc_free_host(host->mmc);
1139                 iounmap(host->base);
1140         }
1141
1142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1143         if (res)
1144                 release_mem_region(res->start, res->end - res->start + 1);
1145         platform_set_drvdata(pdev, NULL);
1146
1147         return 0;
1148 }
1149
1150 #ifdef CONFIG_PM
1151 static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
1152 {
1153         int ret = 0;
1154         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1155
1156         if (host && host->suspended)
1157                 return 0;
1158
1159         if (host) {
1160                 ret = mmc_suspend_host(host->mmc, state);
1161                 if (ret == 0) {
1162                         host->suspended = 1;
1163
1164                         OMAP_HSMMC_WRITE(host->base, ISE, 0);
1165                         OMAP_HSMMC_WRITE(host->base, IE, 0);
1166
1167                         if (host->pdata->suspend) {
1168                                 ret = host->pdata->suspend(&pdev->dev,
1169                                                                 host->slot_id);
1170                                 if (ret)
1171                                         dev_dbg(mmc_dev(host->mmc),
1172                                                 "Unable to handle MMC board"
1173                                                 " level suspend\n");
1174                         }
1175
1176                         if (host->id == OMAP_MMC1_DEVID
1177                                         && !(OMAP_HSMMC_READ(host->base, HCTL)
1178                                                         & SDVSDET)) {
1179                                 OMAP_HSMMC_WRITE(host->base, HCTL,
1180                                         OMAP_HSMMC_READ(host->base, HCTL)
1181                                         & SDVSCLR);
1182                                 OMAP_HSMMC_WRITE(host->base, HCTL,
1183                                         OMAP_HSMMC_READ(host->base, HCTL)
1184                                         | SDVS30);
1185                                 OMAP_HSMMC_WRITE(host->base, HCTL,
1186                                         OMAP_HSMMC_READ(host->base, HCTL)
1187                                         | SDBP);
1188                         }
1189
1190                         clk_disable(host->fclk);
1191                         clk_disable(host->iclk);
1192                         clk_disable(host->dbclk);
1193                 }
1194
1195         }
1196         return ret;
1197 }
1198
1199 /* Routine to resume the MMC device */
1200 static int omap_mmc_resume(struct platform_device *pdev)
1201 {
1202         int ret = 0;
1203         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1204
1205         if (host && !host->suspended)
1206                 return 0;
1207
1208         if (host) {
1209
1210                 ret = clk_enable(host->fclk);
1211                 if (ret)
1212                         goto clk_en_err;
1213
1214                 ret = clk_enable(host->iclk);
1215                 if (ret) {
1216                         clk_disable(host->fclk);
1217                         clk_put(host->fclk);
1218                         goto clk_en_err;
1219                 }
1220
1221                 if (clk_enable(host->dbclk) != 0)
1222                         dev_dbg(mmc_dev(host->mmc),
1223                                         "Enabling debounce clk failed\n");
1224
1225                 if (host->pdata->resume) {
1226                         ret = host->pdata->resume(&pdev->dev, host->slot_id);
1227                         if (ret)
1228                                 dev_dbg(mmc_dev(host->mmc),
1229                                         "Unmask interrupt failed\n");
1230                 }
1231
1232                 /* Notify the core to resume the host */
1233                 ret = mmc_resume_host(host->mmc);
1234                 if (ret == 0)
1235                         host->suspended = 0;
1236         }
1237
1238         return ret;
1239
1240 clk_en_err:
1241         dev_dbg(mmc_dev(host->mmc),
1242                 "Failed to enable MMC clocks during resume\n");
1243         return ret;
1244 }
1245
1246 #else
1247 #define omap_mmc_suspend        NULL
1248 #define omap_mmc_resume         NULL
1249 #endif
1250
1251 static struct platform_driver omap_mmc_driver = {
1252         .probe          = omap_mmc_probe,
1253         .remove         = omap_mmc_remove,
1254         .suspend        = omap_mmc_suspend,
1255         .resume         = omap_mmc_resume,
1256         .driver         = {
1257                 .name = DRIVER_NAME,
1258                 .owner = THIS_MODULE,
1259         },
1260 };
1261
1262 static int __init omap_mmc_init(void)
1263 {
1264         /* Register the MMC driver */
1265         return platform_driver_register(&omap_mmc_driver);
1266 }
1267
1268 static void __exit omap_mmc_cleanup(void)
1269 {
1270         /* Unregister MMC driver */
1271         platform_driver_unregister(&omap_mmc_driver);
1272 }
1273
1274 module_init(omap_mmc_init);
1275 module_exit(omap_mmc_cleanup);
1276
1277 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
1278 MODULE_LICENSE("GPL");
1279 MODULE_ALIAS("platform:" DRIVER_NAME);
1280 MODULE_AUTHOR("Texas Instruments Inc");