drivers/mmc/host/omap_hsmmc.c

   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 SDVS_MASK               0x00000E00
  60 #define SDVSCLR                 0xFFFFF1FF
  61 #define SDVSDET                 0x00000400
  62 #define AUTOIDLE                0x1
  63 #define SDBP                    (1 << 8)
  64 #define DTO                     0xe
  65 #define ICE                     0x1
  66 #define ICS                     0x2
  67 #define CEN                     (1 << 2)
  68 #define CLKD_MASK               0x0000FFC0
  69 #define CLKD_SHIFT              6
  70 #define DTO_MASK                0x000F0000
  71 #define DTO_SHIFT               16
  72 #define INT_EN_MASK             0x307F0033
  73 #define INIT_STREAM             (1 << 1)
  74 #define DP_SELECT               (1 << 21)
  75 #define DDIR                    (1 << 4)
  76 #define DMA_EN                  0x1
  77 #define MSBS                    (1 << 5)
  78 #define BCE                     (1 << 1)
  79 #define FOUR_BIT                (1 << 1)
  80 #define DW8                     (1 << 5)
  81 #define CC                      0x1
  82 #define TC                      0x02
  83 #define OD                      0x1
  84 #define ERR                     (1 << 15)
  85 #define CMD_TIMEOUT             (1 << 16)
  86 #define DATA_TIMEOUT            (1 << 20)
  87 #define CMD_CRC                 (1 << 17)
  88 #define DATA_CRC                (1 << 21)
  89 #define CARD_ERR                (1 << 28)
  90 #define STAT_CLEAR              0xFFFFFFFF
  91 #define INIT_STREAM_CMD         0x00000000
  92 #define DUAL_VOLT_OCR_BIT       7
  93 #define SRC                     (1 << 25)
  94 #define SRD                     (1 << 26)
  95
  96 /*
  97  * FIXME: Most likely all the data using these _DEVID defines should come
  98  * from the platform_data, or implemented in controller and slot specific
  99  * functions.
 100  */
 101 #define OMAP_MMC1_DEVID         0
 102 #define OMAP_MMC2_DEVID         1
 103 #define OMAP_MMC3_DEVID         2
 104
 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_sg_idx;
 141         unsigned char           bus_mode;
 142         u32                     *buffer;
 143         u32                     bytesleft;
 144         int                     suspended;
 145         int                     irq;
 146         int                     carddetect;
 147         int                     use_dma, dma_ch;
 148         int                     dma_line_tx, dma_line_rx;
 149         int                     slot_id;
 150         int                     dbclk_enabled;
 151         int                     response_busy;
 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, "%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         host->response_busy = 0;
 247         if (cmd->flags & MMC_RSP_PRESENT) {
 248                 if (cmd->flags & MMC_RSP_136)
 249                         resptype = 1;
 250                 else if (cmd->flags & MMC_RSP_BUSY) {
 251                         resptype = 3;
 252                         host->response_busy = 1;
 253                 } else
 254                         resptype = 2;
 255         }
 256
 257         /*
 258          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 259          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 260          * a val of 0x3, rest 0x0.
 261          */
 262         if (cmd == host->mrq->stop)
 263                 cmdtype = 0x3;
 264
 265         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 266
 267         if (data) {
 268                 cmdreg |= DP_SELECT | MSBS | BCE;
 269                 if (data->flags & MMC_DATA_READ)
 270                         cmdreg |= DDIR;
 271                 else
 272                         cmdreg &= ~(DDIR);
 273         }
 274
 275         if (host->use_dma)
 276                 cmdreg |= DMA_EN;
 277
 278         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 279         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 280 }
 281
 282 static int
 283 mmc_omap_get_dma_dir(struct mmc_omap_host *host, struct mmc_data *data)
 284 {
 285         if (data->flags & MMC_DATA_WRITE)
 286                 return DMA_TO_DEVICE;
 287         else
 288                 return DMA_FROM_DEVICE;
 289 }
 290
 291 /*
 292  * Notify the transfer complete to MMC core
 293  */
 294 static void
 295 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 296 {
 297         if (!data) {
 298                 struct mmc_request *mrq = host->mrq;
 299
 300                 host->mrq = NULL;
 301                 mmc_request_done(host->mmc, mrq);
 302                 return;
 303         }
 304
 305         host->data = NULL;
 306
 307         if (host->use_dma && host->dma_ch != -1)
 308                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
 309                         mmc_omap_get_dma_dir(host, data));
 310
 311         if (!data->error)
 312                 data->bytes_xfered += data->blocks * (data->blksz);
 313         else
 314                 data->bytes_xfered = 0;
 315
 316         if (!data->stop) {
 317                 host->mrq = NULL;
 318                 mmc_request_done(host->mmc, data->mrq);
 319                 return;
 320         }
 321         mmc_omap_start_command(host, data->stop, NULL);
 322 }
 323
 324 /*
 325  * Notify the core about command completion
 326  */
 327 static void
 328 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 329 {
 330         host->cmd = NULL;
 331
 332         if (cmd->flags & MMC_RSP_PRESENT) {
 333                 if (cmd->flags & MMC_RSP_136) {
 334                         /* response type 2 */
 335                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
 336                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
 337                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
 338                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
 339                 } else {
 340                         /* response types 1, 1b, 3, 4, 5, 6 */
 341                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
 342                 }
 343         }
 344         if ((host->data == NULL && !host->response_busy) || cmd->error) {
 345                 host->mrq = NULL;
 346                 mmc_request_done(host->mmc, cmd->mrq);
 347         }
 348 }
 349
 350 /*
 351  * DMA clean up for command errors
 352  */
 353 static void mmc_dma_cleanup(struct mmc_omap_host *host, int errno)
 354 {
 355         host->data->error = errno;
 356
 357         if (host->use_dma && host->dma_ch != -1) {
 358                 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
 359                         mmc_omap_get_dma_dir(host, host->data));
 360                 omap_free_dma(host->dma_ch);
 361                 host->dma_ch = -1;
 362                 up(&host->sem);
 363         }
 364         host->data = NULL;
 365 }
 366
 367 /*
 368  * Readable error output
 369  */
 370 #ifdef CONFIG_MMC_DEBUG
 371 static void mmc_omap_report_irq(struct mmc_omap_host *host, u32 status)
 372 {
 373         /* --- means reserved bit without definition at documentation */
 374         static const char *mmc_omap_status_bits[] = {
 375                 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
 376                 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
 377                 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
 378                 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
 379         };
 380         char res[256];
 381         char *buf = res;
 382         int len, i;
 383
 384         len = sprintf(buf, "MMC IRQ 0x%x :", status);
 385         buf += len;
 386
 387         for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
 388                 if (status & (1 << i)) {
 389                         len = sprintf(buf, " %s", mmc_omap_status_bits[i]);
 390                         buf += len;
 391                 }
 392
 393         dev_dbg(mmc_dev(host->mmc), "%s\n", res);
 394 }
 395 #endif  /* CONFIG_MMC_DEBUG */
 396
 397 /*
 398  * MMC controller internal state machines reset
 399  *
 400  * Used to reset command or data internal state machines, using respectively
 401  *  SRC or SRD bit of SYSCTL register
 402  * Can be called from interrupt context
 403  */
 404 static inline void mmc_omap_reset_controller_fsm(struct mmc_omap_host *host,
 405                 unsigned long bit)
 406 {
 407         unsigned long i = 0;
 408         unsigned long limit = (loops_per_jiffy *
 409                                 msecs_to_jiffies(MMC_TIMEOUT_MS));
 410
 411         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 412                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
 413
 414         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
 415                 (i++ < limit))
 416                 cpu_relax();
 417
 418         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
 419                 dev_err(mmc_dev(host->mmc),
 420                         "Timeout waiting on controller reset in %s\n",
 421                         __func__);
 422 }
 423
 424 /*
 425  * MMC controller IRQ handler
 426  */
 427 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
 428 {
 429         struct mmc_omap_host *host = dev_id;
 430         struct mmc_data *data;
 431         int end_cmd = 0, end_trans = 0, status;
 432
 433         if (host->mrq == NULL) {
 434                 OMAP_HSMMC_WRITE(host->base, STAT,
 435                         OMAP_HSMMC_READ(host->base, STAT));
 436                 /* Flush posted write */
 437                 OMAP_HSMMC_READ(host->base, STAT);
 438                 return IRQ_HANDLED;
 439         }
 440
 441         data = host->data;
 442         status = OMAP_HSMMC_READ(host->base, STAT);
 443         dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
 444
 445         if (status & ERR) {
 446 #ifdef CONFIG_MMC_DEBUG
 447                 mmc_omap_report_irq(host, status);
 448 #endif
 449                 if ((status & CMD_TIMEOUT) ||
 450                         (status & CMD_CRC)) {
 451                         if (host->cmd) {
 452                                 if (status & CMD_TIMEOUT) {
 453                                         mmc_omap_reset_controller_fsm(host, SRC);
 454                                         host->cmd->error = -ETIMEDOUT;
 455                                 } else {
 456                                         host->cmd->error = -EILSEQ;
 457                                 }
 458                                 end_cmd = 1;
 459                         }
 460                         if (host->data || host->response_busy) {
 461                                 if (host->data)
 462                                         mmc_dma_cleanup(host, -ETIMEDOUT);
 463                                 host->response_busy = 0;
 464                                 mmc_omap_reset_controller_fsm(host, SRD);
 465                         }
 466                 }
 467                 if ((status & DATA_TIMEOUT) ||
 468                         (status & DATA_CRC)) {
 469                         if (host->data || host->response_busy) {
 470                                 int err = (status & DATA_TIMEOUT) ?
 471                                                 -ETIMEDOUT : -EILSEQ;
 472
 473                                 if (host->data)
 474                                         mmc_dma_cleanup(host, err);
 475                                 else
 476                                         host->mrq->cmd->error = err;
 477                                 host->response_busy = 0;
 478                                 mmc_omap_reset_controller_fsm(host, SRD);
 479                                 end_trans = 1;
 480                         }
 481                 }
 482                 if (status & CARD_ERR) {
 483                         dev_dbg(mmc_dev(host->mmc),
 484                                 "Ignoring card err CMD%d\n", host->cmd->opcode);
 485                         if (host->cmd)
 486                                 end_cmd = 1;
 487                         if (host->data)
 488                                 end_trans = 1;
 489                 }
 490         }
 491
 492         OMAP_HSMMC_WRITE(host->base, STAT, status);
 493         /* Flush posted write */
 494         OMAP_HSMMC_READ(host->base, STAT);
 495
 496         if (end_cmd || ((status & CC) && host->cmd))
 497                 mmc_omap_cmd_done(host, host->cmd);
 498         if (end_trans || (status & TC))
 499                 mmc_omap_xfer_done(host, data);
 500
 501         return IRQ_HANDLED;
 502 }
 503
 504 static void set_sd_bus_power(struct mmc_omap_host *host)
 505 {
 506         unsigned long i;
 507
 508         OMAP_HSMMC_WRITE(host->base, HCTL,
 509                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 510         for (i = 0; i < loops_per_jiffy; i++) {
 511                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
 512                         break;
 513                 cpu_relax();
 514         }
 515 }
 516
 517 /*
 518  * Switch MMC interface voltage ... only relevant for MMC1.
 519  *
 520  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
 521  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
 522  * Some chips, like eMMC ones, use internal transceivers.
 523  */
 524 static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
 525 {
 526         u32 reg_val = 0;
 527         int ret;
 528
 529         /* Disable the clocks */
 530         clk_disable(host->fclk);
 531         clk_disable(host->iclk);
 532         clk_disable(host->dbclk);
 533
 534         /* Turn the power off */
 535         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
 536         if (ret != 0)
 537                 goto err;
 538
 539         /* Turn the power ON with given VDD 1.8 or 3.0v */
 540         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
 541         if (ret != 0)
 542                 goto err;
 543
 544         clk_enable(host->fclk);
 545         clk_enable(host->iclk);
 546         clk_enable(host->dbclk);
 547
 548         OMAP_HSMMC_WRITE(host->base, HCTL,
 549                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
 550         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
 551
 552         /*
 553          * If a MMC dual voltage card is detected, the set_ios fn calls
 554          * this fn with VDD bit set for 1.8V. Upon card removal from the
 555          * slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
 556          *
 557          * Cope with a bit of slop in the range ... per data sheets:
 558          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
 559          *    but recommended values are 1.71V to 1.89V
 560          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
 561          *    but recommended values are 2.7V to 3.3V
 562          *
 563          * Board setup code shouldn't permit anything very out-of-range.
 564          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
 565          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
 566          */
 567         if ((1 << vdd) <= MMC_VDD_23_24)
 568                 reg_val |= SDVS18;
 569         else
 570                 reg_val |= SDVS30;
 571
 572         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
 573         set_sd_bus_power(host);
 574
 575         return 0;
 576 err:
 577         dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
 578         return ret;
 579 }
 580
 581 /*
 582  * Work Item to notify the core about card insertion/removal
 583  */
 584 static void mmc_omap_detect(struct work_struct *work)
 585 {
 586         struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
 587                                                 mmc_carddetect_work);
 588         struct omap_mmc_slot_data *slot = &mmc_slot(host);
 589
 590         if (mmc_slot(host).card_detect)
 591                 host->carddetect = slot->card_detect(slot->card_detect_irq);
 592         else
 593                 host->carddetect = -ENOSYS;
 594
 595         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
 596         if (host->carddetect) {
 597                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
 598         } else {
 599                 mmc_omap_reset_controller_fsm(host, SRD);
 600                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
 601         }
 602 }
 603
 604 /*
 605  * ISR for handling card insertion and removal
 606  */
 607 static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id)
 608 {
 609         struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
 610
 611         schedule_work(&host->mmc_carddetect_work);
 612
 613         return IRQ_HANDLED;
 614 }
 615
 616 static int mmc_omap_get_dma_sync_dev(struct mmc_omap_host *host,
 617                                      struct mmc_data *data)
 618 {
 619         int sync_dev;
 620
 621         if (data->flags & MMC_DATA_WRITE)
 622                 sync_dev = host->dma_line_tx;
 623         else
 624                 sync_dev = host->dma_line_rx;
 625         return sync_dev;
 626 }
 627
 628 static void mmc_omap_config_dma_params(struct mmc_omap_host *host,
 629                                        struct mmc_data *data,
 630                                        struct scatterlist *sgl)
 631 {
 632         int blksz, nblk, dma_ch;
 633
 634         dma_ch = host->dma_ch;
 635         if (data->flags & MMC_DATA_WRITE) {
 636                 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
 637                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
 638                 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
 639                         sg_dma_address(sgl), 0, 0);
 640         } else {
 641                 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
 642                                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
 643                 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
 644                         sg_dma_address(sgl), 0, 0);
 645         }
 646
 647         blksz = host->data->blksz;
 648         nblk = sg_dma_len(sgl) / blksz;
 649
 650         omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
 651                         blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
 652                         mmc_omap_get_dma_sync_dev(host, data),
 653                         !(data->flags & MMC_DATA_WRITE));
 654
 655         omap_start_dma(dma_ch);
 656 }
 657
 658 /*
 659  * DMA call back function
 660  */
 661 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
 662 {
 663         struct mmc_omap_host *host = data;
 664
 665         if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
 666                 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
 667
 668         if (host->dma_ch < 0)
 669                 return;
 670
 671         host->dma_sg_idx++;
 672         if (host->dma_sg_idx < host->dma_len) {
 673                 /* Fire up the next transfer. */
 674                 mmc_omap_config_dma_params(host, host->data,
 675                                            host->data->sg + host->dma_sg_idx);
 676                 return;
 677         }
 678
 679         omap_free_dma(host->dma_ch);
 680         host->dma_ch = -1;
 681         /*
 682          * DMA Callback: run in interrupt context.
 683          * mutex_unlock will throw a kernel warning if used.
 684          */
 685         up(&host->sem);
 686 }
 687
 688 /*
 689  * Routine to configure and start DMA for the MMC card
 690  */
 691 static int
 692 mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)
 693 {
 694         int dma_ch = 0, ret = 0, err = 1, i;
 695         struct mmc_data *data = req->data;
 696
 697         /* Sanity check: all the SG entries must be aligned by block size. */
 698         for (i = 0; i < host->dma_len; i++) {
 699                 struct scatterlist *sgl;
 700
 701                 sgl = data->sg + i;
 702                 if (sgl->length % data->blksz)
 703                         return -EINVAL;
 704         }
 705         if ((data->blksz % 4) != 0)
 706                 /* REVISIT: The MMC buffer increments only when MSB is written.
 707                  * Return error for blksz which is non multiple of four.
 708                  */
 709                 return -EINVAL;
 710
 711         /*
 712          * If for some reason the DMA transfer is still active,
 713          * we wait for timeout period and free the dma
 714          */
 715         if (host->dma_ch != -1) {
 716                 set_current_state(TASK_UNINTERRUPTIBLE);
 717                 schedule_timeout(100);
 718                 if (down_trylock(&host->sem)) {
 719                         omap_free_dma(host->dma_ch);
 720                         host->dma_ch = -1;
 721                         up(&host->sem);
 722                         return err;
 723                 }
 724         } else {
 725                 if (down_trylock(&host->sem))
 726                         return err;
 727         }
 728
 729         ret = omap_request_dma(mmc_omap_get_dma_sync_dev(host, data), "MMC/SD",
 730                                mmc_omap_dma_cb,host, &dma_ch);
 731         if (ret != 0) {
 732                 dev_err(mmc_dev(host->mmc),
 733                         "%s: omap_request_dma() failed with %d\n",
 734                         mmc_hostname(host->mmc), ret);
 735                 return ret;
 736         }
 737
 738         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
 739                         data->sg_len, mmc_omap_get_dma_dir(host, data));
 740         host->dma_ch = dma_ch;
 741         host->dma_sg_idx = 0;
 742
 743         mmc_omap_config_dma_params(host, data, data->sg);
 744
 745         return 0;
 746 }
 747
 748 static void set_data_timeout(struct mmc_omap_host *host,
 749                              struct mmc_request *req)
 750 {
 751         unsigned int timeout, cycle_ns;
 752         uint32_t reg, clkd, dto = 0;
 753
 754         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
 755         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
 756         if (clkd == 0)
 757                 clkd = 1;
 758
 759         cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
 760         timeout = req->data->timeout_ns / cycle_ns;
 761         timeout += req->data->timeout_clks;
 762         if (timeout) {
 763                 while ((timeout & 0x80000000) == 0) {
 764                         dto += 1;
 765                         timeout <<= 1;
 766                 }
 767                 dto = 31 - dto;
 768                 timeout <<= 1;
 769                 if (timeout && dto)
 770                         dto += 1;
 771                 if (dto >= 13)
 772                         dto -= 13;
 773                 else
 774                         dto = 0;
 775                 if (dto > 14)
 776                         dto = 14;
 777         }
 778
 779         reg &= ~DTO_MASK;
 780         reg |= dto << DTO_SHIFT;
 781         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
 782 }
 783
 784 /*
 785  * Configure block length for MMC/SD cards and initiate the transfer.
 786  */
 787 static int
 788 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 789 {
 790         int ret;
 791         host->data = req->data;
 792
 793         if (req->data == NULL) {
 794                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
 795                 return 0;
 796         }
 797
 798         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
 799                                         | (req->data->blocks << 16));
 800         set_data_timeout(host, req);
 801
 802         if (host->use_dma) {
 803                 ret = mmc_omap_start_dma_transfer(host, req);
 804                 if (ret != 0) {
 805                         dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
 806                         return ret;
 807                 }
 808         }
 809         return 0;
 810 }
 811
 812 /*
 813  * Request function. for read/write operation
 814  */
 815 static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
 816 {
 817         struct mmc_omap_host *host = mmc_priv(mmc);
 818
 819         WARN_ON(host->mrq != NULL);
 820         host->mrq = req;
 821         mmc_omap_prepare_data(host, req);
 822         mmc_omap_start_command(host, req->cmd, req->data);
 823 }
 824
 825
 826 /* Routine to configure clock values. Exposed API to core */
 827 static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 828 {
 829         struct mmc_omap_host *host = mmc_priv(mmc);
 830         u16 dsor = 0;
 831         unsigned long regval;
 832         unsigned long timeout;
 833         u32 con;
 834
 835         switch (ios->power_mode) {
 836         case MMC_POWER_OFF:
 837                 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
 838                 break;
 839         case MMC_POWER_UP:
 840                 mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd);
 841                 break;
 842         }
 843
 844         con = OMAP_HSMMC_READ(host->base, CON);
 845         switch (mmc->ios.bus_width) {
 846         case MMC_BUS_WIDTH_8:
 847                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
 848                 break;
 849         case MMC_BUS_WIDTH_4:
 850                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 851                 OMAP_HSMMC_WRITE(host->base, HCTL,
 852                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 853                 break;
 854         case MMC_BUS_WIDTH_1:
 855                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 856                 OMAP_HSMMC_WRITE(host->base, HCTL,
 857                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 858                 break;
 859         }
 860
 861         if (host->id == OMAP_MMC1_DEVID) {
 862                 /* Only MMC1 can interface at 3V without some flavor
 863                  * of external transceiver; but they all handle 1.8V.
 864                  */
 865                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
 866                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
 867                                 /*
 868                                  * The mmc_select_voltage fn of the core does
 869                                  * not seem to set the power_mode to
 870                                  * MMC_POWER_UP upon recalculating the voltage.
 871                                  * vdd 1.8v.
 872                                  */
 873                                 if (omap_mmc_switch_opcond(host, ios->vdd) != 0)
 874                                         dev_dbg(mmc_dev(host->mmc),
 875                                                 "Switch operation failed\n");
 876                 }
 877         }
 878
 879         if (ios->clock) {
 880                 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
 881                 if (dsor < 1)
 882                         dsor = 1;
 883
 884                 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
 885                         dsor++;
 886
 887                 if (dsor > 250)
 888                         dsor = 250;
 889         }
 890         omap_mmc_stop_clock(host);
 891         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 892         regval = regval & ~(CLKD_MASK);
 893         regval = regval | (dsor << 6) | (DTO << 16);
 894         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 895         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 896                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 897
 898         /* Wait till the ICS bit is set */
 899         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 900         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2
 901                 && time_before(jiffies, timeout))
 902                 msleep(1);
 903
 904         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 905                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 906
 907         if (ios->power_mode == MMC_POWER_ON)
 908                 send_init_stream(host);
 909
 910         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 911                 OMAP_HSMMC_WRITE(host->base, CON,
 912                                 OMAP_HSMMC_READ(host->base, CON) | OD);
 913 }
 914
 915 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
 916 {
 917         struct mmc_omap_host *host = mmc_priv(mmc);
 918         struct omap_mmc_platform_data *pdata = host->pdata;
 919
 920         if (!pdata->slots[0].card_detect)
 921                 return -ENOSYS;
 922         return pdata->slots[0].card_detect(pdata->slots[0].card_detect_irq);
 923 }
 924
 925 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
 926 {
 927         struct mmc_omap_host *host = mmc_priv(mmc);
 928         struct omap_mmc_platform_data *pdata = host->pdata;
 929
 930         if (!pdata->slots[0].get_ro)
 931                 return -ENOSYS;
 932         return pdata->slots[0].get_ro(host->dev, 0);
 933 }
 934
 935 static void omap_hsmmc_init(struct mmc_omap_host *host)
 936 {
 937         u32 hctl, capa, value;
 938
 939         /* Only MMC1 supports 3.0V */
 940         if (host->id == OMAP_MMC1_DEVID) {
 941                 hctl = SDVS30;
 942                 capa = VS30 | VS18;
 943         } else {
 944                 hctl = SDVS18;
 945                 capa = VS18;
 946         }
 947
 948         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
 949         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
 950
 951         value = OMAP_HSMMC_READ(host->base, CAPA);
 952         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
 953
 954         /* Set the controller to AUTO IDLE mode */
 955         value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
 956         OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
 957
 958         /* Set SD bus power bit */
 959         set_sd_bus_power(host);
 960 }
 961
 962 static struct mmc_host_ops mmc_omap_ops = {
 963         .request = omap_mmc_request,
 964         .set_ios = omap_mmc_set_ios,
 965         .get_cd = omap_hsmmc_get_cd,
 966         .get_ro = omap_hsmmc_get_ro,
 967         /* NYET -- enable_sdio_irq */
 968 };
 969
 970 static int __init omap_mmc_probe(struct platform_device *pdev)
 971 {
 972         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
 973         struct mmc_host *mmc;
 974         struct mmc_omap_host *host = NULL;
 975         struct resource *res;
 976         int ret = 0, irq;
 977
 978         if (pdata == NULL) {
 979                 dev_err(&pdev->dev, "Platform Data is missing\n");
 980                 return -ENXIO;
 981         }
 982
 983         if (pdata->nr_slots == 0) {
 984                 dev_err(&pdev->dev, "No Slots\n");
 985                 return -ENXIO;
 986         }
 987
 988         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 989         irq = platform_get_irq(pdev, 0);
 990         if (res == NULL || irq < 0)
 991                 return -ENXIO;
 992
 993         res = request_mem_region(res->start, res->end - res->start + 1,
 994                                                         pdev->name);
 995         if (res == NULL)
 996                 return -EBUSY;
 997
 998         mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
 999         if (!mmc) {
1000                 ret = -ENOMEM;
1001                 goto err;
1002         }
1003
1004         host            = mmc_priv(mmc);
1005         host->mmc       = mmc;
1006         host->pdata     = pdata;
1007         host->dev       = &pdev->dev;
1008         host->use_dma   = 1;
1009         host->dev->dma_mask = &pdata->dma_mask;
1010         host->dma_ch    = -1;
1011         host->irq       = irq;
1012         host->id        = pdev->id;
1013         host->slot_id   = 0;
1014         host->mapbase   = res->start;
1015         host->base      = ioremap(host->mapbase, SZ_4K);
1016
1017         platform_set_drvdata(pdev, host);
1018         INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
1019
1020         mmc->ops        = &mmc_omap_ops;
1021         mmc->f_min      = 400000;
1022         mmc->f_max      = 52000000;
1023
1024         sema_init(&host->sem, 1);
1025
1026         host->iclk = clk_get(&pdev->dev, "ick");
1027         if (IS_ERR(host->iclk)) {
1028                 ret = PTR_ERR(host->iclk);
1029                 host->iclk = NULL;
1030                 goto err1;
1031         }
1032         host->fclk = clk_get(&pdev->dev, "fck");
1033         if (IS_ERR(host->fclk)) {
1034                 ret = PTR_ERR(host->fclk);
1035                 host->fclk = NULL;
1036                 clk_put(host->iclk);
1037                 goto err1;
1038         }
1039
1040         if (clk_enable(host->fclk) != 0) {
1041                 clk_put(host->iclk);
1042                 clk_put(host->fclk);
1043                 goto err1;
1044         }
1045
1046         if (clk_enable(host->iclk) != 0) {
1047                 clk_disable(host->fclk);
1048                 clk_put(host->iclk);
1049                 clk_put(host->fclk);
1050                 goto err1;
1051         }
1052
1053         host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
1054         /*
1055          * MMC can still work without debounce clock.
1056          */
1057         if (IS_ERR(host->dbclk))
1058                 dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n");
1059         else
1060                 if (clk_enable(host->dbclk) != 0)
1061                         dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
1062                                                         " clk failed\n");
1063                 else
1064                         host->dbclk_enabled = 1;
1065
1066         /* Since we do only SG emulation, we can have as many segs
1067          * as we want. */
1068         mmc->max_phys_segs = 1024;
1069         mmc->max_hw_segs = 1024;
1070
1071         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
1072         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
1073         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1074         mmc->max_seg_size = mmc->max_req_size;
1075
1076         mmc->ocr_avail = mmc_slot(host).ocr_mask;
1077         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED;
1078
1079         if (pdata->slots[host->slot_id].wires >= 8)
1080                 mmc->caps |= MMC_CAP_8_BIT_DATA;
1081         else if (pdata->slots[host->slot_id].wires >= 4)
1082                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1083
1084         omap_hsmmc_init(host);
1085
1086         /* Select DMA lines */
1087         switch (host->id) {
1088         case OMAP_MMC1_DEVID:
1089                 host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
1090                 host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
1091                 break;
1092         case OMAP_MMC2_DEVID:
1093                 host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
1094                 host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
1095                 break;
1096         case OMAP_MMC3_DEVID:
1097                 host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
1098                 host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
1099                 break;
1100         default:
1101                 dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
1102                 goto err_irq;
1103         }
1104
1105         /* Request IRQ for MMC operations */
1106         ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED,
1107                         mmc_hostname(mmc), host);
1108         if (ret) {
1109                 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1110                 goto err_irq;
1111         }
1112
1113         if (pdata->init != NULL) {
1114                 if (pdata->init(&pdev->dev) != 0) {
1115                         dev_dbg(mmc_dev(host->mmc),
1116                                 "Unable to configure MMC IRQs\n");
1117                         goto err_irq_cd_init;
1118                 }
1119         }
1120
1121         /* Request IRQ for card detect */
1122         if ((mmc_slot(host).card_detect_irq)) {
1123                 ret = request_irq(mmc_slot(host).card_detect_irq,
1124                                   omap_mmc_cd_handler,
1125                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
1126                                           | IRQF_DISABLED,
1127                                   mmc_hostname(mmc), host);
1128                 if (ret) {
1129                         dev_dbg(mmc_dev(host->mmc),
1130                                 "Unable to grab MMC CD IRQ\n");
1131                         goto err_irq_cd;
1132                 }
1133         }
1134
1135         OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
1136         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
1137
1138         mmc_add_host(mmc);
1139
1140         if (host->pdata->slots[host->slot_id].name != NULL) {
1141                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1142                 if (ret < 0)
1143                         goto err_slot_name;
1144         }
1145         if (mmc_slot(host).card_detect_irq &&
1146             host->pdata->slots[host->slot_id].get_cover_state) {
1147                 ret = device_create_file(&mmc->class_dev,
1148                                         &dev_attr_cover_switch);
1149                 if (ret < 0)
1150                         goto err_cover_switch;
1151         }
1152
1153         return 0;
1154
1155 err_cover_switch:
1156         device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1157 err_slot_name:
1158         mmc_remove_host(mmc);
1159 err_irq_cd:
1160         free_irq(mmc_slot(host).card_detect_irq, host);
1161 err_irq_cd_init:
1162         free_irq(host->irq, host);
1163 err_irq:
1164         clk_disable(host->fclk);
1165         clk_disable(host->iclk);
1166         clk_put(host->fclk);
1167         clk_put(host->iclk);
1168         if (host->dbclk_enabled) {
1169                 clk_disable(host->dbclk);
1170                 clk_put(host->dbclk);
1171         }
1172
1173 err1:
1174         iounmap(host->base);
1175 err:
1176         dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
1177         release_mem_region(res->start, res->end - res->start + 1);
1178         if (host)
1179                 mmc_free_host(mmc);
1180         return ret;
1181 }
1182
1183 static int omap_mmc_remove(struct platform_device *pdev)
1184 {
1185         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1186         struct resource *res;
1187
1188         if (host) {
1189                 mmc_remove_host(host->mmc);
1190                 if (host->pdata->cleanup)
1191                         host->pdata->cleanup(&pdev->dev);
1192                 free_irq(host->irq, host);
1193                 if (mmc_slot(host).card_detect_irq)
1194                         free_irq(mmc_slot(host).card_detect_irq, host);
1195                 flush_scheduled_work();
1196
1197                 clk_disable(host->fclk);
1198                 clk_disable(host->iclk);
1199                 clk_put(host->fclk);
1200                 clk_put(host->iclk);
1201                 if (host->dbclk_enabled) {
1202                         clk_disable(host->dbclk);
1203                         clk_put(host->dbclk);
1204                 }
1205
1206                 mmc_free_host(host->mmc);
1207                 iounmap(host->base);
1208         }
1209
1210         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1211         if (res)
1212                 release_mem_region(res->start, res->end - res->start + 1);
1213         platform_set_drvdata(pdev, NULL);
1214
1215         return 0;
1216 }
1217
1218 #ifdef CONFIG_PM
1219 static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
1220 {
1221         int ret = 0;
1222         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1223
1224         if (host && host->suspended)
1225                 return 0;
1226
1227         if (host) {
1228                 ret = mmc_suspend_host(host->mmc, state);
1229                 if (ret == 0) {
1230                         host->suspended = 1;
1231
1232                         OMAP_HSMMC_WRITE(host->base, ISE, 0);
1233                         OMAP_HSMMC_WRITE(host->base, IE, 0);
1234
1235                         if (host->pdata->suspend) {
1236                                 ret = host->pdata->suspend(&pdev->dev,
1237                                                                 host->slot_id);
1238                                 if (ret)
1239                                         dev_dbg(mmc_dev(host->mmc),
1240                                                 "Unable to handle MMC board"
1241                                                 " level suspend\n");
1242                         }
1243
1244                         OMAP_HSMMC_WRITE(host->base, HCTL,
1245                                          OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
1246                         clk_disable(host->fclk);
1247                         clk_disable(host->iclk);
1248                         clk_disable(host->dbclk);
1249                 }
1250
1251         }
1252         return ret;
1253 }
1254
1255 /* Routine to resume the MMC device */
1256 static int omap_mmc_resume(struct platform_device *pdev)
1257 {
1258         int ret = 0;
1259         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1260
1261         if (host && !host->suspended)
1262                 return 0;
1263
1264         if (host) {
1265
1266                 ret = clk_enable(host->fclk);
1267                 if (ret)
1268                         goto clk_en_err;
1269
1270                 ret = clk_enable(host->iclk);
1271                 if (ret) {
1272                         clk_disable(host->fclk);
1273                         clk_put(host->fclk);
1274                         goto clk_en_err;
1275                 }
1276
1277                 if (clk_enable(host->dbclk) != 0)
1278                         dev_dbg(mmc_dev(host->mmc),
1279                                         "Enabling debounce clk failed\n");
1280
1281                 omap_hsmmc_init(host);
1282
1283                 if (host->pdata->resume) {
1284                         ret = host->pdata->resume(&pdev->dev, host->slot_id);
1285                         if (ret)
1286                                 dev_dbg(mmc_dev(host->mmc),
1287                                         "Unmask interrupt failed\n");
1288                 }
1289
1290                 /* Notify the core to resume the host */
1291                 ret = mmc_resume_host(host->mmc);
1292                 if (ret == 0)
1293                         host->suspended = 0;
1294         }
1295
1296         return ret;
1297
1298 clk_en_err:
1299         dev_dbg(mmc_dev(host->mmc),
1300                 "Failed to enable MMC clocks during resume\n");
1301         return ret;
1302 }
1303
1304 #else
1305 #define omap_mmc_suspend        NULL
1306 #define omap_mmc_resume         NULL
1307 #endif
1308
1309 static struct platform_driver omap_mmc_driver = {
1310         .probe          = omap_mmc_probe,
1311         .remove         = omap_mmc_remove,
1312         .suspend        = omap_mmc_suspend,
1313         .resume         = omap_mmc_resume,
1314         .driver         = {
1315                 .name = DRIVER_NAME,
1316                 .owner = THIS_MODULE,
1317         },
1318 };
1319
1320 static int __init omap_mmc_init(void)
1321 {
1322         /* Register the MMC driver */
1323         return platform_driver_register(&omap_mmc_driver);
1324 }
1325
1326 static void __exit omap_mmc_cleanup(void)
1327 {
1328         /* Unregister MMC driver */
1329         platform_driver_unregister(&omap_mmc_driver);
1330 }
1331
1332 module_init(omap_mmc_init);
1333 module_exit(omap_mmc_cleanup);
1334
1335 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
1336 MODULE_LICENSE("GPL");
1337 MODULE_ALIAS("platform:" DRIVER_NAME);
1338 MODULE_AUTHOR("Texas Instruments Inc");