drivers/mmc/omap.c

   1 /*
   2  *  linux/drivers/media/mmc/omap.c
   3  *
   4  *  Copyright (C) 2004 Nokia Corporation
   5  *  Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com>
   6  *  Misc hacks here and there by Tony Lindgren <tony@atomide.com>
   7  *  Other hacks (DMA, SD, etc) by David Brownell
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/ioport.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/delay.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/timer.h>
  24 #include <linux/mmc/host.h>
  25 #include <linux/mmc/protocol.h>
  26 #include <linux/mmc/card.h>
  27 #include <linux/clk.h>
  28
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/scatterlist.h>
  32 #include <asm/mach-types.h>
  33
  34 #include <asm/arch/board.h>
  35 #include <asm/arch/gpio.h>
  36 #include <asm/arch/dma.h>
  37 #include <asm/arch/mux.h>
  38 #include <asm/arch/fpga.h>
  39 #include <asm/arch/tps65010.h>
  40
  41 #define OMAP_MMC_REG_CMD        0x00
  42 #define OMAP_MMC_REG_ARGL       0x04
  43 #define OMAP_MMC_REG_ARGH       0x08
  44 #define OMAP_MMC_REG_CON        0x0c
  45 #define OMAP_MMC_REG_STAT       0x10
  46 #define OMAP_MMC_REG_IE         0x14
  47 #define OMAP_MMC_REG_CTO        0x18
  48 #define OMAP_MMC_REG_DTO        0x1c
  49 #define OMAP_MMC_REG_DATA       0x20
  50 #define OMAP_MMC_REG_BLEN       0x24
  51 #define OMAP_MMC_REG_NBLK       0x28
  52 #define OMAP_MMC_REG_BUF        0x2c
  53 #define OMAP_MMC_REG_SDIO       0x34
  54 #define OMAP_MMC_REG_REV        0x3c
  55 #define OMAP_MMC_REG_RSP0       0x40
  56 #define OMAP_MMC_REG_RSP1       0x44
  57 #define OMAP_MMC_REG_RSP2       0x48
  58 #define OMAP_MMC_REG_RSP3       0x4c
  59 #define OMAP_MMC_REG_RSP4       0x50
  60 #define OMAP_MMC_REG_RSP5       0x54
  61 #define OMAP_MMC_REG_RSP6       0x58
  62 #define OMAP_MMC_REG_RSP7       0x5c
  63 #define OMAP_MMC_REG_IOSR       0x60
  64 #define OMAP_MMC_REG_SYSC       0x64
  65 #define OMAP_MMC_REG_SYSS       0x68
  66
  67 #define OMAP_MMC_STAT_CARD_ERR          (1 << 14)
  68 #define OMAP_MMC_STAT_CARD_IRQ          (1 << 13)
  69 #define OMAP_MMC_STAT_OCR_BUSY          (1 << 12)
  70 #define OMAP_MMC_STAT_A_EMPTY           (1 << 11)
  71 #define OMAP_MMC_STAT_A_FULL            (1 << 10)
  72 #define OMAP_MMC_STAT_CMD_CRC           (1 <<  8)
  73 #define OMAP_MMC_STAT_CMD_TOUT          (1 <<  7)
  74 #define OMAP_MMC_STAT_DATA_CRC          (1 <<  6)
  75 #define OMAP_MMC_STAT_DATA_TOUT         (1 <<  5)
  76 #define OMAP_MMC_STAT_END_BUSY          (1 <<  4)
  77 #define OMAP_MMC_STAT_END_OF_DATA       (1 <<  3)
  78 #define OMAP_MMC_STAT_CARD_BUSY         (1 <<  2)
  79 #define OMAP_MMC_STAT_END_OF_CMD        (1 <<  0)
  80
  81 #define OMAP_MMC_READ(host, reg)        __raw_readw((host)->virt_base + OMAP_MMC_REG_##reg)
  82 #define OMAP_MMC_WRITE(host, reg, val)  __raw_writew((val), (host)->virt_base + OMAP_MMC_REG_##reg)
  83
  84 /*
  85  * Command types
  86  */
  87 #define OMAP_MMC_CMDTYPE_BC     0
  88 #define OMAP_MMC_CMDTYPE_BCR    1
  89 #define OMAP_MMC_CMDTYPE_AC     2
  90 #define OMAP_MMC_CMDTYPE_ADTC   3
  91
  92
  93 #define DRIVER_NAME "mmci-omap"
  94
  95 /* Specifies how often in millisecs to poll for card status changes
  96  * when the cover switch is open */
  97 #define OMAP_MMC_SWITCH_POLL_DELAY      500
  98
  99 static int mmc_omap_enable_poll = 1;
 100
 101 struct mmc_omap_host {
 102         int                     initialized;
 103         int                     suspended;
 104         struct mmc_request *    mrq;
 105         struct mmc_command *    cmd;
 106         struct mmc_data *       data;
 107         struct mmc_host *       mmc;
 108         struct device *         dev;
 109         unsigned char           id; /* 16xx chips have 2 MMC blocks */
 110         struct clk *            iclk;
 111         struct clk *            fclk;
 112         struct resource         *mem_res;
 113         void __iomem            *virt_base;
 114         unsigned int            phys_base;
 115         int                     irq;
 116         unsigned char           bus_mode;
 117         unsigned char           hw_bus_mode;
 118
 119         unsigned int            sg_len;
 120         int                     sg_idx;
 121         u16 *                   buffer;
 122         u32                     buffer_bytes_left;
 123         u32                     total_bytes_left;
 124
 125         unsigned                use_dma:1;
 126         unsigned                brs_received:1, dma_done:1;
 127         unsigned                dma_is_read:1;
 128         unsigned                dma_in_use:1;
 129         int                     dma_ch;
 130         spinlock_t              dma_lock;
 131         struct timer_list       dma_timer;
 132         unsigned                dma_len;
 133
 134         short                   power_pin;
 135         short                   wp_pin;
 136
 137         int                     switch_pin;
 138         struct work_struct      switch_work;
 139         struct timer_list       switch_timer;
 140         int                     switch_last_state;
 141 };
 142
 143 static inline int
 144 mmc_omap_cover_is_open(struct mmc_omap_host *host)
 145 {
 146         if (host->switch_pin < 0)
 147                 return 0;
 148         return omap_get_gpio_datain(host->switch_pin);
 149 }
 150
 151 static ssize_t
 152 mmc_omap_show_cover_switch(struct device *dev,
 153         struct device_attribute *attr, char *buf)
 154 {
 155         struct mmc_omap_host *host = dev_get_drvdata(dev);
 156
 157         return sprintf(buf, "%s\n", mmc_omap_cover_is_open(host) ? "open" :
 158                         "closed");
 159 }
 160
 161 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
 162
 163 static ssize_t
 164 mmc_omap_show_enable_poll(struct device *dev,
 165         struct device_attribute *attr, char *buf)
 166 {
 167         return snprintf(buf, PAGE_SIZE, "%d\n", mmc_omap_enable_poll);
 168 }
 169
 170 static ssize_t
 171 mmc_omap_store_enable_poll(struct device *dev,
 172         struct device_attribute *attr, const char *buf,
 173         size_t size)
 174 {
 175         int enable_poll;
 176
 177         if (sscanf(buf, "%10d", &enable_poll) != 1)
 178                 return -EINVAL;
 179
 180         if (enable_poll != mmc_omap_enable_poll) {
 181                 struct mmc_omap_host *host = dev_get_drvdata(dev);
 182
 183                 mmc_omap_enable_poll = enable_poll;
 184                 if (enable_poll && host->switch_pin >= 0)
 185                         schedule_work(&host->switch_work);
 186         }
 187         return size;
 188 }
 189
 190 static DEVICE_ATTR(enable_poll, 0664,
 191                    mmc_omap_show_enable_poll, mmc_omap_store_enable_poll);
 192
 193 static void
 194 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
 195 {
 196         u32 cmdreg;
 197         u32 resptype;
 198         u32 cmdtype;
 199
 200         host->cmd = cmd;
 201
 202         resptype = 0;
 203         cmdtype = 0;
 204
 205         /* Our hardware needs to know exact type */
 206         switch (mmc_resp_type(cmd)) {
 207         case MMC_RSP_NONE:
 208                 break;
 209         case MMC_RSP_R1:
 210         case MMC_RSP_R1B:
 211                 /* resp 1, 1b, 6, 7 */
 212                 resptype = 1;
 213                 break;
 214         case MMC_RSP_R2:
 215                 resptype = 2;
 216                 break;
 217         case MMC_RSP_R3:
 218                 resptype = 3;
 219                 break;
 220         default:
 221                 dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
 222                 break;
 223         }
 224
 225         if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
 226                 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
 227         } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
 228                 cmdtype = OMAP_MMC_CMDTYPE_BC;
 229         } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
 230                 cmdtype = OMAP_MMC_CMDTYPE_BCR;
 231         } else {
 232                 cmdtype = OMAP_MMC_CMDTYPE_AC;
 233         }
 234
 235         cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
 236
 237         if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
 238                 cmdreg |= 1 << 6;
 239
 240         if (cmd->flags & MMC_RSP_BUSY)
 241                 cmdreg |= 1 << 11;
 242
 243         if (host->data && !(host->data->flags & MMC_DATA_WRITE))
 244                 cmdreg |= 1 << 15;
 245
 246         clk_enable(host->fclk);
 247
 248         OMAP_MMC_WRITE(host, CTO, 200);
 249         OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
 250         OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
 251         OMAP_MMC_WRITE(host, IE,
 252                        OMAP_MMC_STAT_A_EMPTY    | OMAP_MMC_STAT_A_FULL    |
 253                        OMAP_MMC_STAT_CMD_CRC    | OMAP_MMC_STAT_CMD_TOUT  |
 254                        OMAP_MMC_STAT_DATA_CRC   | OMAP_MMC_STAT_DATA_TOUT |
 255                        OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR  |
 256                        OMAP_MMC_STAT_END_OF_DATA);
 257         OMAP_MMC_WRITE(host, CMD, cmdreg);
 258 }
 259
 260 static void
 261 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 262 {
 263         if (host->dma_in_use) {
 264                 enum dma_data_direction dma_data_dir;
 265
 266                 BUG_ON(host->dma_ch < 0);
 267                 if (data->error != MMC_ERR_NONE)
 268                         omap_stop_dma(host->dma_ch);
 269                 /* Release DMA channel lazily */
 270                 mod_timer(&host->dma_timer, jiffies + HZ);
 271                 if (data->flags & MMC_DATA_WRITE)
 272                         dma_data_dir = DMA_TO_DEVICE;
 273                 else
 274                         dma_data_dir = DMA_FROM_DEVICE;
 275                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
 276                              dma_data_dir);
 277         }
 278         host->data = NULL;
 279         host->sg_len = 0;
 280         clk_disable(host->fclk);
 281
 282         /* NOTE:  MMC layer will sometimes poll-wait CMD13 next, issuing
 283          * dozens of requests until the card finishes writing data.
 284          * It'd be cheaper to just wait till an EOFB interrupt arrives...
 285          */
 286
 287         if (!data->stop) {
 288                 host->mrq = NULL;
 289                 mmc_request_done(host->mmc, data->mrq);
 290                 return;
 291         }
 292
 293         mmc_omap_start_command(host, data->stop);
 294 }
 295
 296 static void
 297 mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
 298 {
 299         unsigned long flags;
 300         int done;
 301
 302         if (!host->dma_in_use) {
 303                 mmc_omap_xfer_done(host, data);
 304                 return;
 305         }
 306         done = 0;
 307         spin_lock_irqsave(&host->dma_lock, flags);
 308         if (host->dma_done)
 309                 done = 1;
 310         else
 311                 host->brs_received = 1;
 312         spin_unlock_irqrestore(&host->dma_lock, flags);
 313         if (done)
 314                 mmc_omap_xfer_done(host, data);
 315 }
 316
 317 static void
 318 mmc_omap_dma_timer(unsigned long data)
 319 {
 320         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 321
 322         BUG_ON(host->dma_ch < 0);
 323         omap_free_dma(host->dma_ch);
 324         host->dma_ch = -1;
 325 }
 326
 327 static void
 328 mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
 329 {
 330         unsigned long flags;
 331         int done;
 332
 333         done = 0;
 334         spin_lock_irqsave(&host->dma_lock, flags);
 335         if (host->brs_received)
 336                 done = 1;
 337         else
 338                 host->dma_done = 1;
 339         spin_unlock_irqrestore(&host->dma_lock, flags);
 340         if (done)
 341                 mmc_omap_xfer_done(host, data);
 342 }
 343
 344 static void
 345 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 346 {
 347         host->cmd = NULL;
 348
 349         if (cmd->flags & MMC_RSP_PRESENT) {
 350                 if (cmd->flags & MMC_RSP_136) {
 351                         /* response type 2 */
 352                         cmd->resp[3] =
 353                                 OMAP_MMC_READ(host, RSP0) |
 354                                 (OMAP_MMC_READ(host, RSP1) << 16);
 355                         cmd->resp[2] =
 356                                 OMAP_MMC_READ(host, RSP2) |
 357                                 (OMAP_MMC_READ(host, RSP3) << 16);
 358                         cmd->resp[1] =
 359                                 OMAP_MMC_READ(host, RSP4) |
 360                                 (OMAP_MMC_READ(host, RSP5) << 16);
 361                         cmd->resp[0] =
 362                                 OMAP_MMC_READ(host, RSP6) |
 363                                 (OMAP_MMC_READ(host, RSP7) << 16);
 364                 } else {
 365                         /* response types 1, 1b, 3, 4, 5, 6 */
 366                         cmd->resp[0] =
 367                                 OMAP_MMC_READ(host, RSP6) |
 368                                 (OMAP_MMC_READ(host, RSP7) << 16);
 369                 }
 370         }
 371
 372         if (host->data == NULL || cmd->error != MMC_ERR_NONE) {
 373                 host->mrq = NULL;
 374                 clk_disable(host->fclk);
 375                 mmc_request_done(host->mmc, cmd->mrq);
 376         }
 377 }
 378
 379 /* PIO only */
 380 static void
 381 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 382 {
 383         struct scatterlist *sg;
 384
 385         sg = host->data->sg + host->sg_idx;
 386         host->buffer_bytes_left = sg->length;
 387         host->buffer = page_address(sg->page) + sg->offset;
 388         if (host->buffer_bytes_left > host->total_bytes_left)
 389                 host->buffer_bytes_left = host->total_bytes_left;
 390 }
 391
 392 /* PIO only */
 393 static void
 394 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 395 {
 396         int n;
 397
 398         if (host->buffer_bytes_left == 0) {
 399                 host->sg_idx++;
 400                 BUG_ON(host->sg_idx == host->sg_len);
 401                 mmc_omap_sg_to_buf(host);
 402         }
 403         n = 64;
 404         if (n > host->buffer_bytes_left)
 405                 n = host->buffer_bytes_left;
 406         host->buffer_bytes_left -= n;
 407         host->total_bytes_left -= n;
 408         host->data->bytes_xfered += n;
 409
 410         if (write) {
 411                 __raw_writesw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
 412         } else {
 413                 __raw_readsw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
 414         }
 415 }
 416
 417 static inline void mmc_omap_report_irq(u16 status)
 418 {
 419         static const char *mmc_omap_status_bits[] = {
 420                 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
 421                 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
 422         };
 423         int i, c = 0;
 424
 425         for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
 426                 if (status & (1 << i)) {
 427                         if (c)
 428                                 printk(" ");
 429                         printk("%s", mmc_omap_status_bits[i]);
 430                         c++;
 431                 }
 432 }
 433
 434 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
 435 {
 436         struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
 437         u16 status;
 438         int end_command;
 439         int end_transfer;
 440         int transfer_error;
 441
 442         if (host->cmd == NULL && host->data == NULL) {
 443                 status = OMAP_MMC_READ(host, STAT);
 444                 dev_info(mmc_dev(host->mmc),"spurious irq 0x%04x\n", status);
 445                 if (status != 0) {
 446                         OMAP_MMC_WRITE(host, STAT, status);
 447                         OMAP_MMC_WRITE(host, IE, 0);
 448                 }
 449                 return IRQ_HANDLED;
 450         }
 451
 452         end_command = 0;
 453         end_transfer = 0;
 454         transfer_error = 0;
 455
 456         while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
 457                 OMAP_MMC_WRITE(host, STAT, status);
 458 #ifdef CONFIG_MMC_DEBUG
 459                 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
 460                         status, host->cmd != NULL ? host->cmd->opcode : -1);
 461                 mmc_omap_report_irq(status);
 462                 printk("\n");
 463 #endif
 464                 if (host->total_bytes_left) {
 465                         if ((status & OMAP_MMC_STAT_A_FULL) ||
 466                             (status & OMAP_MMC_STAT_END_OF_DATA))
 467                                 mmc_omap_xfer_data(host, 0);
 468                         if (status & OMAP_MMC_STAT_A_EMPTY)
 469                                 mmc_omap_xfer_data(host, 1);
 470                 }
 471
 472                 if (status & OMAP_MMC_STAT_END_OF_DATA) {
 473                         end_transfer = 1;
 474                 }
 475
 476                 if (status & OMAP_MMC_STAT_DATA_TOUT) {
 477                         dev_dbg(mmc_dev(host->mmc), "data timeout\n");
 478                         if (host->data) {
 479                                 host->data->error |= MMC_ERR_TIMEOUT;
 480                                 transfer_error = 1;
 481                         }
 482                 }
 483
 484                 if (status & OMAP_MMC_STAT_DATA_CRC) {
 485                         if (host->data) {
 486                                 host->data->error |= MMC_ERR_BADCRC;
 487                                 dev_dbg(mmc_dev(host->mmc),
 488                                          "data CRC error, bytes left %d\n",
 489                                         host->total_bytes_left);
 490                                 transfer_error = 1;
 491                         } else {
 492                                 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
 493                         }
 494                 }
 495
 496                 if (status & OMAP_MMC_STAT_CMD_TOUT) {
 497                         /* Timeouts are routine with some commands */
 498                         if (host->cmd) {
 499                                 if (host->cmd->opcode != MMC_ALL_SEND_CID &&
 500                                                 host->cmd->opcode !=
 501                                                 MMC_SEND_OP_COND &&
 502                                                 host->cmd->opcode !=
 503                                                 MMC_APP_CMD &&
 504                                                 !mmc_omap_cover_is_open(host))
 505                                         dev_err(mmc_dev(host->mmc),
 506                                                 "command timeout, CMD %d\n",
 507                                                 host->cmd->opcode);
 508                                 host->cmd->error = MMC_ERR_TIMEOUT;
 509                                 end_command = 1;
 510                         }
 511                 }
 512
 513                 if (status & OMAP_MMC_STAT_CMD_CRC) {
 514                         if (host->cmd) {
 515                                 dev_err(mmc_dev(host->mmc),
 516                                         "command CRC error (CMD%d, arg 0x%08x)\n",
 517                                         host->cmd->opcode, host->cmd->arg);
 518                                 host->cmd->error = MMC_ERR_BADCRC;
 519                                 end_command = 1;
 520                         } else
 521                                 dev_err(mmc_dev(host->mmc),
 522                                         "command CRC error without cmd?\n");
 523                 }
 524
 525                 if (status & OMAP_MMC_STAT_CARD_ERR) {
 526                         if (host->cmd && host->cmd->opcode == MMC_STOP_TRANSMISSION) {
 527                                 u32 response = OMAP_MMC_READ(host, RSP6)
 528                                         | (OMAP_MMC_READ(host, RSP7) << 16);
 529                                 /* STOP sometimes sets must-ignore bits */
 530                                 if (!(response & (R1_CC_ERROR
 531                                                                 | R1_ILLEGAL_COMMAND
 532                                                                 | R1_COM_CRC_ERROR))) {
 533                                         end_command = 1;
 534                                         continue;
 535                                 }
 536                         }
 537
 538                         dev_dbg(mmc_dev(host->mmc), "card status error (CMD%d)\n",
 539                                 host->cmd->opcode);
 540                         if (host->cmd) {
 541                                 host->cmd->error = MMC_ERR_FAILED;
 542                                 end_command = 1;
 543                         }
 544                         if (host->data) {
 545                                 host->data->error = MMC_ERR_FAILED;
 546                                 transfer_error = 1;
 547                         }
 548                 }
 549
 550                 /*
 551                  * NOTE: On 1610 the END_OF_CMD may come too early when
 552                  * starting a write
 553                  */
 554                 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
 555                     (!(status & OMAP_MMC_STAT_A_EMPTY))) {
 556                         end_command = 1;
 557                 }
 558         }
 559
 560         if (end_command) {
 561                 mmc_omap_cmd_done(host, host->cmd);
 562         }
 563         if (transfer_error)
 564                 mmc_omap_xfer_done(host, host->data);
 565         else if (end_transfer)
 566                 mmc_omap_end_of_data(host, host->data);
 567
 568         return IRQ_HANDLED;
 569 }
 570
 571 static irqreturn_t mmc_omap_switch_irq(int irq, void *dev_id)
 572 {
 573         struct mmc_omap_host *host = (struct mmc_omap_host *) dev_id;
 574
 575         schedule_work(&host->switch_work);
 576
 577         return IRQ_HANDLED;
 578 }
 579
 580 static void mmc_omap_switch_timer(unsigned long arg)
 581 {
 582         struct mmc_omap_host *host = (struct mmc_omap_host *) arg;
 583
 584         schedule_work(&host->switch_work);
 585 }
 586
 587 static void mmc_omap_switch_handler(struct work_struct *work)
 588 {
 589         struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, switch_work);
 590         struct mmc_card *card;
 591         static int complained = 0;
 592         int cards = 0, cover_open;
 593
 594         if (host->switch_pin == -1)
 595                 return;
 596         cover_open = mmc_omap_cover_is_open(host);
 597         if (cover_open != host->switch_last_state) {
 598                 kobject_uevent(&host->dev->kobj, KOBJ_CHANGE);
 599                 host->switch_last_state = cover_open;
 600         }
 601         mmc_detect_change(host->mmc, 0);
 602         list_for_each_entry(card, &host->mmc->cards, node) {
 603                 if (mmc_card_present(card))
 604                         cards++;
 605         }
 606         if (mmc_omap_cover_is_open(host)) {
 607                 if (!complained) {
 608                         dev_info(mmc_dev(host->mmc), "cover is open");
 609                         complained = 1;
 610                 }
 611                 if (mmc_omap_enable_poll)
 612                         mod_timer(&host->switch_timer, jiffies +
 613                                 msecs_to_jiffies(OMAP_MMC_SWITCH_POLL_DELAY));
 614         } else {
 615                 complained = 0;
 616         }
 617 }
 618
 619 /* Prepare to transfer the next segment of a scatterlist */
 620 static void
 621 mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
 622 {
 623         int dma_ch = host->dma_ch;
 624         unsigned long data_addr;
 625         u16 buf, frame;
 626         u32 count;
 627         struct scatterlist *sg = &data->sg[host->sg_idx];
 628         int src_port = 0;
 629         int dst_port = 0;
 630         int sync_dev = 0;
 631
 632         data_addr = host->phys_base + OMAP_MMC_REG_DATA;
 633         frame = data->blksz;
 634         count = sg_dma_len(sg);
 635
 636         if ((data->blocks == 1) && (count > data->blksz))
 637                 count = frame;
 638
 639         host->dma_len = count;
 640
 641         /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
 642          * Use 16 or 32 word frames when the blocksize is at least that large.
 643          * Blocksize is usually 512 bytes; but not for some SD reads.
 644          */
 645         if (cpu_is_omap15xx() && frame > 32)
 646                 frame = 32;
 647         else if (frame > 64)
 648                 frame = 64;
 649         count /= frame;
 650         frame >>= 1;
 651
 652         if (!(data->flags & MMC_DATA_WRITE)) {
 653                 buf = 0x800f | ((frame - 1) << 8);
 654
 655                 if (cpu_class_is_omap1()) {
 656                         src_port = OMAP_DMA_PORT_TIPB;
 657                         dst_port = OMAP_DMA_PORT_EMIFF;
 658                 }
 659                 if (cpu_is_omap24xx())
 660                         sync_dev = OMAP24XX_DMA_MMC1_RX;
 661
 662                 omap_set_dma_src_params(dma_ch, src_port,
 663                                         OMAP_DMA_AMODE_CONSTANT,
 664                                         data_addr, 0, 0);
 665                 omap_set_dma_dest_params(dma_ch, dst_port,
 666                                          OMAP_DMA_AMODE_POST_INC,
 667                                          sg_dma_address(sg), 0, 0);
 668                 omap_set_dma_dest_data_pack(dma_ch, 1);
 669                 omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
 670         } else {
 671                 buf = 0x0f80 | ((frame - 1) << 0);
 672
 673                 if (cpu_class_is_omap1()) {
 674                         src_port = OMAP_DMA_PORT_EMIFF;
 675                         dst_port = OMAP_DMA_PORT_TIPB;
 676                 }
 677                 if (cpu_is_omap24xx())
 678                         sync_dev = OMAP24XX_DMA_MMC1_TX;
 679
 680                 omap_set_dma_dest_params(dma_ch, dst_port,
 681                                          OMAP_DMA_AMODE_CONSTANT,
 682                                          data_addr, 0, 0);
 683                 omap_set_dma_src_params(dma_ch, src_port,
 684                                         OMAP_DMA_AMODE_POST_INC,
 685                                         sg_dma_address(sg), 0, 0);
 686                 omap_set_dma_src_data_pack(dma_ch, 1);
 687                 omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
 688         }
 689
 690         /* Max limit for DMA frame count is 0xffff */
 691         BUG_ON(count > 0xffff);
 692
 693         OMAP_MMC_WRITE(host, BUF, buf);
 694         omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
 695                                      frame, count, OMAP_DMA_SYNC_FRAME,
 696                                      sync_dev, 0);
 697 }
 698
 699 /* A scatterlist segment completed */
 700 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
 701 {
 702         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 703         struct mmc_data *mmcdat = host->data;
 704
 705         if (unlikely(host->dma_ch < 0)) {
 706                 dev_err(mmc_dev(host->mmc),
 707                         "DMA callback while DMA not enabled\n");
 708                 return;
 709         }
 710         /* FIXME: We really should do something to _handle_ the errors */
 711         if (ch_status & OMAP1_DMA_TOUT_IRQ) {
 712                 dev_err(mmc_dev(host->mmc),"DMA timeout\n");
 713                 return;
 714         }
 715         if (ch_status & OMAP_DMA_DROP_IRQ) {
 716                 dev_err(mmc_dev(host->mmc), "DMA sync error\n");
 717                 return;
 718         }
 719         if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
 720                 return;
 721         }
 722         mmcdat->bytes_xfered += host->dma_len;
 723         host->sg_idx++;
 724         if (host->sg_idx < host->sg_len) {
 725                 mmc_omap_prepare_dma(host, host->data);
 726                 omap_start_dma(host->dma_ch);
 727         } else
 728                 mmc_omap_dma_done(host, host->data);
 729 }
 730
 731 static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
 732 {
 733         const char *dev_name;
 734         int sync_dev, dma_ch, is_read, r;
 735
 736         is_read = !(data->flags & MMC_DATA_WRITE);
 737         del_timer_sync(&host->dma_timer);
 738         if (host->dma_ch >= 0) {
 739                 if (is_read == host->dma_is_read)
 740                         return 0;
 741                 omap_free_dma(host->dma_ch);
 742                 host->dma_ch = -1;
 743         }
 744
 745         if (is_read) {
 746                 if (host->id == 1) {
 747                         sync_dev = OMAP_DMA_MMC_RX;
 748                         dev_name = "MMC1 read";
 749                 } else {
 750                         sync_dev = OMAP_DMA_MMC2_RX;
 751                         dev_name = "MMC2 read";
 752                 }
 753         } else {
 754                 if (host->id == 1) {
 755                         sync_dev = OMAP_DMA_MMC_TX;
 756                         dev_name = "MMC1 write";
 757                 } else {
 758                         sync_dev = OMAP_DMA_MMC2_TX;
 759                         dev_name = "MMC2 write";
 760                 }
 761         }
 762         r = omap_request_dma(sync_dev, dev_name, mmc_omap_dma_cb,
 763                              host, &dma_ch);
 764         if (r != 0) {
 765                 dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
 766                 return r;
 767         }
 768         host->dma_ch = dma_ch;
 769         host->dma_is_read = is_read;
 770
 771         return 0;
 772 }
 773
 774 static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
 775 {
 776         u16 reg;
 777
 778         reg = OMAP_MMC_READ(host, SDIO);
 779         reg &= ~(1 << 5);
 780         OMAP_MMC_WRITE(host, SDIO, reg);
 781         /* Set maximum timeout */
 782         OMAP_MMC_WRITE(host, CTO, 0xff);
 783 }
 784
 785 static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
 786 {
 787         int timeout;
 788         u16 reg;
 789
 790         /* Convert ns to clock cycles by assuming 20MHz frequency
 791          * 1 cycle at 20MHz = 500 ns
 792          */
 793         timeout = req->data->timeout_clks + req->data->timeout_ns / 500;
 794
 795         /* Check if we need to use timeout multiplier register */
 796         reg = OMAP_MMC_READ(host, SDIO);
 797         if (timeout > 0xffff) {
 798                 reg |= (1 << 5);
 799                 timeout /= 1024;
 800         } else
 801                 reg &= ~(1 << 5);
 802         OMAP_MMC_WRITE(host, SDIO, reg);
 803         OMAP_MMC_WRITE(host, DTO, timeout);
 804 }
 805
 806 static void
 807 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 808 {
 809         struct mmc_data *data = req->data;
 810         int i, use_dma, block_size;
 811         unsigned sg_len;
 812
 813         host->data = data;
 814         if (data == NULL) {
 815                 OMAP_MMC_WRITE(host, BLEN, 0);
 816                 OMAP_MMC_WRITE(host, NBLK, 0);
 817                 OMAP_MMC_WRITE(host, BUF, 0);
 818                 host->dma_in_use = 0;
 819                 set_cmd_timeout(host, req);
 820                 return;
 821         }
 822
 823         block_size = data->blksz;
 824
 825         OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
 826         OMAP_MMC_WRITE(host, BLEN, block_size - 1);
 827         set_data_timeout(host, req);
 828
 829         /* cope with calling layer confusion; it issues "single
 830          * block" writes using multi-block scatterlists.
 831          */
 832         sg_len = (data->blocks == 1) ? 1 : data->sg_len;
 833
 834         /* Only do DMA for entire blocks */
 835         use_dma = host->use_dma;
 836         if (use_dma) {
 837                 for (i = 0; i < sg_len; i++) {
 838                         if ((data->sg[i].length % block_size) != 0) {
 839                                 use_dma = 0;
 840                                 break;
 841                         }
 842                 }
 843         }
 844
 845         host->sg_idx = 0;
 846         if (use_dma) {
 847                 if (mmc_omap_get_dma_channel(host, data) == 0) {
 848                         enum dma_data_direction dma_data_dir;
 849
 850                         if (data->flags & MMC_DATA_WRITE)
 851                                 dma_data_dir = DMA_TO_DEVICE;
 852                         else
 853                                 dma_data_dir = DMA_FROM_DEVICE;
 854
 855                         host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
 856                                                 sg_len, dma_data_dir);
 857                         host->total_bytes_left = 0;
 858                         mmc_omap_prepare_dma(host, req->data);
 859                         host->brs_received = 0;
 860                         host->dma_done = 0;
 861                         host->dma_in_use = 1;
 862                 } else
 863                         use_dma = 0;
 864         }
 865
 866         /* Revert to PIO? */
 867         if (!use_dma) {
 868                 OMAP_MMC_WRITE(host, BUF, 0x1f1f);
 869                 host->total_bytes_left = data->blocks * block_size;
 870                 host->sg_len = sg_len;
 871                 mmc_omap_sg_to_buf(host);
 872                 host->dma_in_use = 0;
 873         }
 874 }
 875
 876 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
 877 {
 878         struct mmc_omap_host *host = mmc_priv(mmc);
 879
 880         WARN_ON(host->mrq != NULL);
 881
 882         host->mrq = req;
 883
 884         /* only touch fifo AFTER the controller readies it */
 885         mmc_omap_prepare_data(host, req);
 886         mmc_omap_start_command(host, req->cmd);
 887         if (host->dma_in_use)
 888                 omap_start_dma(host->dma_ch);
 889 }
 890
 891 static void innovator_fpga_socket_power(int on)
 892 {
 893 #if defined(CONFIG_MACH_OMAP_INNOVATOR) && defined(CONFIG_ARCH_OMAP15XX)
 894         if (on) {
 895                 fpga_write(fpga_read(OMAP1510_FPGA_POWER) | (1 << 3),
 896                      OMAP1510_FPGA_POWER);
 897         } else {
 898                 fpga_write(fpga_read(OMAP1510_FPGA_POWER) & ~(1 << 3),
 899                      OMAP1510_FPGA_POWER);
 900         }
 901 #endif
 902 }
 903
 904 /*
 905  * Turn the socket power on/off. Innovator uses FPGA, most boards
 906  * probably use GPIO.
 907  */
 908 static void mmc_omap_power(struct mmc_omap_host *host, int on)
 909 {
 910         if (on) {
 911                 if (machine_is_omap_innovator())
 912                         innovator_fpga_socket_power(1);
 913                 else if (machine_is_omap_h2())
 914                         tps65010_set_gpio_out_value(GPIO3, HIGH);
 915                 else if (machine_is_omap_h3())
 916                         /* GPIO 4 of TPS65010 sends SD_EN signal */
 917                         tps65010_set_gpio_out_value(GPIO4, HIGH);
 918                 else if (cpu_is_omap24xx()) {
 919                         u16 reg = OMAP_MMC_READ(host, CON);
 920                         OMAP_MMC_WRITE(host, CON, reg | (1 << 11));
 921                 } else
 922                         if (host->power_pin >= 0)
 923                                 omap_set_gpio_dataout(host->power_pin, 1);
 924         } else {
 925                 if (machine_is_omap_innovator())
 926                         innovator_fpga_socket_power(0);
 927                 else if (machine_is_omap_h2())
 928                         tps65010_set_gpio_out_value(GPIO3, LOW);
 929                 else if (machine_is_omap_h3())
 930                         tps65010_set_gpio_out_value(GPIO4, LOW);
 931                 else if (cpu_is_omap24xx()) {
 932                         u16 reg = OMAP_MMC_READ(host, CON);
 933                         OMAP_MMC_WRITE(host, CON, reg & ~(1 << 11));
 934                 } else
 935                         if (host->power_pin >= 0)
 936                                 omap_set_gpio_dataout(host->power_pin, 0);
 937         }
 938 }
 939
 940 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 941 {
 942         struct mmc_omap_host *host = mmc_priv(mmc);
 943         int dsor;
 944         int realclock, i;
 945
 946         realclock = ios->clock;
 947
 948         if (ios->clock == 0)
 949                 dsor = 0;
 950         else {
 951                 int func_clk_rate = clk_get_rate(host->fclk);
 952
 953                 dsor = func_clk_rate / realclock;
 954                 if (dsor < 1)
 955                         dsor = 1;
 956
 957                 if (func_clk_rate / dsor > realclock)
 958                         dsor++;
 959
 960                 if (dsor > 250)
 961                         dsor = 250;
 962                 dsor++;
 963
 964                 if (ios->bus_width == MMC_BUS_WIDTH_4)
 965                         dsor |= 1 << 15;
 966         }
 967
 968         switch (ios->power_mode) {
 969         case MMC_POWER_OFF:
 970                 mmc_omap_power(host, 0);
 971                 break;
 972         case MMC_POWER_UP:
 973         case MMC_POWER_ON:
 974                 mmc_omap_power(host, 1);
 975                 dsor |= 1 << 11;
 976                 break;
 977         }
 978
 979         host->bus_mode = ios->bus_mode;
 980         host->hw_bus_mode = host->bus_mode;
 981
 982         clk_enable(host->fclk);
 983
 984         /* On insanely high arm_per frequencies something sometimes
 985          * goes somehow out of sync, and the POW bit is not being set,
 986          * which results in the while loop below getting stuck.
 987          * Writing to the CON register twice seems to do the trick. */
 988         for (i = 0; i < 2; i++)
 989                 OMAP_MMC_WRITE(host, CON, dsor);
 990         if (ios->power_mode == MMC_POWER_UP) {
 991                 /* Send clock cycles, poll completion */
 992                 OMAP_MMC_WRITE(host, IE, 0);
 993                 OMAP_MMC_WRITE(host, STAT, 0xffff);
 994                 OMAP_MMC_WRITE(host, CMD, 1 << 7);
 995                 while ((OMAP_MMC_READ(host, STAT) & 1) == 0);
 996                 OMAP_MMC_WRITE(host, STAT, 1);
 997         }
 998         clk_disable(host->fclk);
 999 }
1000
1001 static int mmc_omap_get_ro(struct mmc_host *mmc)
1002 {
1003         struct mmc_omap_host *host = mmc_priv(mmc);
1004
1005         return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
1006 }
1007
1008 static const struct mmc_host_ops mmc_omap_ops = {
1009         .request        = mmc_omap_request,
1010         .set_ios        = mmc_omap_set_ios,
1011         .get_ro         = mmc_omap_get_ro,
1012 };
1013
1014 static int __init mmc_omap_probe(struct platform_device *pdev)
1015 {
1016         struct omap_mmc_conf *minfo = pdev->dev.platform_data;
1017         struct mmc_host *mmc;
1018         struct mmc_omap_host *host = NULL;
1019         struct resource *res;
1020         int ret = 0;
1021         int irq;
1022
1023         if (minfo == NULL) {
1024                 dev_err(&pdev->dev, "platform data missing\n");
1025                 return -ENXIO;
1026         }
1027
1028         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1029         irq = platform_get_irq(pdev, 0);
1030         if (res == NULL || irq < 0)
1031                 return -ENXIO;
1032
1033         res = request_mem_region(res->start, res->end - res->start + 1,
1034                                  pdev->name);
1035         if (res == NULL)
1036                 return -EBUSY;
1037
1038         mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
1039         if (mmc == NULL) {
1040                 ret = -ENOMEM;
1041                 goto err_free_mem_region;
1042         }
1043
1044         host = mmc_priv(mmc);
1045         host->mmc = mmc;
1046
1047         spin_lock_init(&host->dma_lock);
1048         init_timer(&host->dma_timer);
1049         host->dma_timer.function = mmc_omap_dma_timer;
1050         host->dma_timer.data = (unsigned long) host;
1051
1052         host->id = pdev->id;
1053         host->mem_res = res;
1054         host->irq = irq;
1055
1056         if (cpu_is_omap24xx()) {
1057                 host->iclk = clk_get(&pdev->dev, "mmc_ick");
1058                 if (IS_ERR(host->iclk))
1059                         goto err_free_mmc_host;
1060                 clk_enable(host->iclk);
1061         }
1062
1063         if (!cpu_is_omap24xx())
1064                 host->fclk = clk_get(&pdev->dev, "mmc_ck");
1065         else
1066                 host->fclk = clk_get(&pdev->dev, "mmc_fck");
1067
1068         if (IS_ERR(host->fclk)) {
1069                 ret = PTR_ERR(host->fclk);
1070                 goto err_free_iclk;
1071         }
1072
1073         /* REVISIT:
1074          * Also, use minfo->cover to decide how to manage
1075          * the card detect sensing.
1076          */
1077         host->power_pin = minfo->power_pin;
1078         host->switch_pin = minfo->switch_pin;
1079         host->wp_pin = minfo->wp_pin;
1080         host->use_dma = 1;
1081         host->dma_ch = -1;
1082
1083         host->irq = irq;
1084         host->phys_base = host->mem_res->start;
1085         host->virt_base = (void __iomem *) IO_ADDRESS(host->phys_base);
1086
1087         mmc->ops = &mmc_omap_ops;
1088         mmc->f_min = 400000;
1089         mmc->f_max = 24000000;
1090         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1091         mmc->caps = MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1092
1093         if (minfo->wire4)
1094                  mmc->caps |= MMC_CAP_4_BIT_DATA;
1095
1096         /* Use scatterlist DMA to reduce per-transfer costs.
1097          * NOTE max_seg_size assumption that small blocks aren't
1098          * normally used (except e.g. for reading SD registers).
1099          */
1100         mmc->max_phys_segs = 32;
1101         mmc->max_hw_segs = 32;
1102         mmc->max_sectors = 256; /* NBLK max 11-bits, OMAP also limited by DMA */
1103         mmc->max_seg_size = mmc->max_sectors * 512;
1104
1105         if (host->power_pin >= 0) {
1106                 if ((ret = omap_request_gpio(host->power_pin)) != 0) {
1107                         dev_err(mmc_dev(host->mmc),
1108                                 "Unable to get GPIO pin for MMC power\n");
1109                         goto err_free_fclk;
1110                 }
1111                 omap_set_gpio_direction(host->power_pin, 0);
1112         }
1113
1114         ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1115         if (ret)
1116                 goto err_free_power_gpio;
1117
1118         host->dev = &pdev->dev;
1119         platform_set_drvdata(pdev, host);
1120
1121         if (host->switch_pin >= 0) {
1122                 INIT_WORK(&host->switch_work, mmc_omap_switch_handler);
1123                 init_timer(&host->switch_timer);
1124                 host->switch_timer.function = mmc_omap_switch_timer;
1125                 host->switch_timer.data = (unsigned long) host;
1126                 if (omap_request_gpio(host->switch_pin) != 0) {
1127                         dev_warn(mmc_dev(host->mmc), "Unable to get GPIO pin for MMC cover switch\n");
1128                         host->switch_pin = -1;
1129                         goto no_switch;
1130                 }
1131
1132                 omap_set_gpio_direction(host->switch_pin, 1);
1133                 ret = request_irq(OMAP_GPIO_IRQ(host->switch_pin),
1134                                   mmc_omap_switch_irq, IRQF_TRIGGER_RISING, DRIVER_NAME, host);
1135                 if (ret) {
1136                         dev_warn(mmc_dev(host->mmc), "Unable to get IRQ for MMC cover switch\n");
1137                         omap_free_gpio(host->switch_pin);
1138                         host->switch_pin = -1;
1139                         goto no_switch;
1140                 }
1141                 ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
1142                 if (ret == 0) {
1143                         ret = device_create_file(&pdev->dev, &dev_attr_enable_poll);
1144                         if (ret != 0)
1145                                 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1146                 }
1147                 if (ret) {
1148                         dev_warn(mmc_dev(host->mmc), "Unable to create sysfs attributes\n");
1149                         free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1150                         omap_free_gpio(host->switch_pin);
1151                         host->switch_pin = -1;
1152                         goto no_switch;
1153                 }
1154                 if (mmc_omap_enable_poll && mmc_omap_cover_is_open(host))
1155                         schedule_work(&host->switch_work);
1156         }
1157
1158         mmc_add_host(mmc);
1159
1160         return 0;
1161
1162 no_switch:
1163         /* FIXME: Free other resources too. */
1164         if (host) {
1165                 if (host->iclk && !IS_ERR(host->iclk))
1166                         clk_put(host->iclk);
1167                 if (host->fclk && !IS_ERR(host->fclk))
1168                         clk_put(host->fclk);
1169                 mmc_free_host(host->mmc);
1170         }
1171 err_free_power_gpio:
1172         if (host->power_pin >= 0)
1173                 omap_free_gpio(host->power_pin);
1174 err_free_fclk:
1175         clk_put(host->fclk);
1176 err_free_iclk:
1177         if (host->iclk != NULL) {
1178                 clk_disable(host->iclk);
1179                 clk_put(host->iclk);
1180         }
1181 err_free_mmc_host:
1182         mmc_free_host(host->mmc);
1183 err_free_mem_region:
1184         release_mem_region(res->start, res->end - res->start + 1);
1185         return ret;
1186 }
1187
1188 static int mmc_omap_remove(struct platform_device *pdev)
1189 {
1190         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1191
1192         platform_set_drvdata(pdev, NULL);
1193
1194         BUG_ON(host == NULL);
1195
1196         mmc_remove_host(host->mmc);
1197         free_irq(host->irq, host);
1198
1199         if (host->power_pin >= 0)
1200                 omap_free_gpio(host->power_pin);
1201         if (host->switch_pin >= 0) {
1202                 device_remove_file(&pdev->dev, &dev_attr_enable_poll);
1203                 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1204                 free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1205                 omap_free_gpio(host->switch_pin);
1206                 host->switch_pin = -1;
1207                 del_timer_sync(&host->switch_timer);
1208                 flush_scheduled_work();
1209         }
1210         if (host->iclk && !IS_ERR(host->iclk))
1211                 clk_put(host->iclk);
1212         if (host->fclk && !IS_ERR(host->fclk))
1213                 clk_put(host->fclk);
1214
1215         release_mem_region(pdev->resource[0].start,
1216                            pdev->resource[0].end - pdev->resource[0].start + 1);
1217
1218         mmc_free_host(host->mmc);
1219
1220         return 0;
1221 }
1222
1223 #ifdef CONFIG_PM
1224 static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1225 {
1226         int ret = 0;
1227         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1228
1229         if (host && host->suspended)
1230                 return 0;
1231
1232         if (host) {
1233                 ret = mmc_suspend_host(host->mmc, mesg);
1234                 if (ret == 0)
1235                         host->suspended = 1;
1236         }
1237         return ret;
1238 }
1239
1240 static int mmc_omap_resume(struct platform_device *pdev)
1241 {
1242         int ret = 0;
1243         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1244
1245         if (host && !host->suspended)
1246                 return 0;
1247
1248         if (host) {
1249                 ret = mmc_resume_host(host->mmc);
1250                 if (ret == 0)
1251                         host->suspended = 0;
1252         }
1253
1254         return ret;
1255 }
1256 #else
1257 #define mmc_omap_suspend        NULL
1258 #define mmc_omap_resume         NULL
1259 #endif
1260
1261 static struct platform_driver mmc_omap_driver = {
1262         .probe          = mmc_omap_probe,
1263         .remove         = mmc_omap_remove,
1264         .suspend        = mmc_omap_suspend,
1265         .resume         = mmc_omap_resume,
1266         .driver         = {
1267                 .name   = DRIVER_NAME,
1268         },
1269 };
1270
1271 static int __init mmc_omap_init(void)
1272 {
1273         return platform_driver_register(&mmc_omap_driver);
1274 }
1275
1276 static void __exit mmc_omap_exit(void)
1277 {
1278         platform_driver_unregister(&mmc_omap_driver);
1279 }
1280
1281 module_init(mmc_omap_init);
1282 module_exit(mmc_omap_exit);
1283
1284 MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1285 MODULE_LICENSE("GPL");
1286 MODULE_ALIAS(DRIVER_NAME);
1287 MODULE_AUTHOR("Juha Yrjölä");