git.oblomov.eu Git - linux-2.6/blob - drivers/mmc/host/pxamci.c

   1 /*
   2  *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
   3  *
   4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  This hardware is really sick:
  11  *   - No way to clear interrupts.
  12  *   - Have to turn off the clock whenever we touch the device.
  13  *   - Doesn't tell you how many data blocks were transferred.
  14  *  Yuck!
  15  *
  16  *      1 and 3 byte data transfers not supported
  17  *      max block length up to 1023
  18  */
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/delay.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28 #include <linux/mmc/host.h>
  29
  30 #include <asm/dma.h>
  31 #include <asm/io.h>
  32 #include <asm/sizes.h>
  33
  34 #include <asm/arch/pxa-regs.h>
  35 #include <asm/arch/mmc.h>
  36
  37 #include "pxamci.h"
  38
  39 #define DRIVER_NAME     "pxa2xx-mci"
  40
  41 #define NR_SG   1
  42 #define CLKRT_OFF       (~0)
  43
  44 struct pxamci_host {
  45         struct mmc_host         *mmc;
  46         spinlock_t              lock;
  47         struct resource         *res;
  48         void __iomem            *base;
  49         struct clk              *clk;
  50         unsigned long           clkrate;
  51         int                     irq;
  52         int                     dma;
  53         unsigned int            clkrt;
  54         unsigned int            cmdat;
  55         unsigned int            imask;
  56         unsigned int            power_mode;
  57         struct pxamci_platform_data *pdata;
  58
  59         struct mmc_request      *mrq;
  60         struct mmc_command      *cmd;
  61         struct mmc_data         *data;
  62
  63         dma_addr_t              sg_dma;
  64         struct pxa_dma_desc     *sg_cpu;
  65         unsigned int            dma_len;
  66
  67         unsigned int            dma_dir;
  68         unsigned int            dma_drcmrrx;
  69         unsigned int            dma_drcmrtx;
  70 };
  71
  72 static void pxamci_stop_clock(struct pxamci_host *host)
  73 {
  74         if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
  75                 unsigned long timeout = 10000;
  76                 unsigned int v;
  77
  78                 writel(STOP_CLOCK, host->base + MMC_STRPCL);
  79
  80                 do {
  81                         v = readl(host->base + MMC_STAT);
  82                         if (!(v & STAT_CLK_EN))
  83                                 break;
  84                         udelay(1);
  85                 } while (timeout--);
  86
  87                 if (v & STAT_CLK_EN)
  88                         dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
  89         }
  90 }
  91
  92 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
  93 {
  94         unsigned long flags;
  95
  96         spin_lock_irqsave(&host->lock, flags);
  97         host->imask &= ~mask;
  98         writel(host->imask, host->base + MMC_I_MASK);
  99         spin_unlock_irqrestore(&host->lock, flags);
 100 }
 101
 102 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
 103 {
 104         unsigned long flags;
 105
 106         spin_lock_irqsave(&host->lock, flags);
 107         host->imask |= mask;
 108         writel(host->imask, host->base + MMC_I_MASK);
 109         spin_unlock_irqrestore(&host->lock, flags);
 110 }
 111
 112 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
 113 {
 114         unsigned int nob = data->blocks;
 115         unsigned long long clks;
 116         unsigned int timeout;
 117         bool dalgn = 0;
 118         u32 dcmd;
 119         int i;
 120
 121         host->data = data;
 122
 123         if (data->flags & MMC_DATA_STREAM)
 124                 nob = 0xffff;
 125
 126         writel(nob, host->base + MMC_NOB);
 127         writel(data->blksz, host->base + MMC_BLKLEN);
 128
 129         clks = (unsigned long long)data->timeout_ns * host->clkrate;
 130         do_div(clks, 1000000000UL);
 131         timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
 132         writel((timeout + 255) / 256, host->base + MMC_RDTO);
 133
 134         if (data->flags & MMC_DATA_READ) {
 135                 host->dma_dir = DMA_FROM_DEVICE;
 136                 dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
 137                 DRCMR(host->dma_drcmrtx) = 0;
 138                 DRCMR(host->dma_drcmrrx) = host->dma | DRCMR_MAPVLD;
 139         } else {
 140                 host->dma_dir = DMA_TO_DEVICE;
 141                 dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
 142                 DRCMR(host->dma_drcmrrx) = 0;
 143                 DRCMR(host->dma_drcmrtx) = host->dma | DRCMR_MAPVLD;
 144         }
 145
 146         dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
 147
 148         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 149                                    host->dma_dir);
 150
 151         for (i = 0; i < host->dma_len; i++) {
 152                 unsigned int length = sg_dma_len(&data->sg[i]);
 153                 host->sg_cpu[i].dcmd = dcmd | length;
 154                 if (length & 31 && !(data->flags & MMC_DATA_READ))
 155                         host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
 156                 /* Not aligned to 8-byte boundary? */
 157                 if (sg_dma_address(&data->sg[i]) & 0x7)
 158                         dalgn = 1;
 159                 if (data->flags & MMC_DATA_READ) {
 160                         host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
 161                         host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
 162                 } else {
 163                         host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
 164                         host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
 165                 }
 166                 host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
 167                                         sizeof(struct pxa_dma_desc);
 168         }
 169         host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
 170         wmb();
 171
 172         /*
 173          * The PXA27x DMA controller encounters overhead when working with
 174          * unaligned (to 8-byte boundaries) data, so switch on byte alignment
 175          * mode only if we have unaligned data.
 176          */
 177         if (dalgn)
 178                 DALGN |= (1 << host->dma);
 179         else
 180                 DALGN &= ~(1 << host->dma);
 181         DDADR(host->dma) = host->sg_dma;
 182         DCSR(host->dma) = DCSR_RUN;
 183 }
 184
 185 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
 186 {
 187         WARN_ON(host->cmd != NULL);
 188         host->cmd = cmd;
 189
 190         if (cmd->flags & MMC_RSP_BUSY)
 191                 cmdat |= CMDAT_BUSY;
 192
 193 #define RSP_TYPE(x)     ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
 194         switch (RSP_TYPE(mmc_resp_type(cmd))) {
 195         case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
 196                 cmdat |= CMDAT_RESP_SHORT;
 197                 break;
 198         case RSP_TYPE(MMC_RSP_R3):
 199                 cmdat |= CMDAT_RESP_R3;
 200                 break;
 201         case RSP_TYPE(MMC_RSP_R2):
 202                 cmdat |= CMDAT_RESP_R2;
 203                 break;
 204         default:
 205                 break;
 206         }
 207
 208         writel(cmd->opcode, host->base + MMC_CMD);
 209         writel(cmd->arg >> 16, host->base + MMC_ARGH);
 210         writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
 211         writel(cmdat, host->base + MMC_CMDAT);
 212         writel(host->clkrt, host->base + MMC_CLKRT);
 213
 214         writel(START_CLOCK, host->base + MMC_STRPCL);
 215
 216         pxamci_enable_irq(host, END_CMD_RES);
 217 }
 218
 219 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
 220 {
 221         host->mrq = NULL;
 222         host->cmd = NULL;
 223         host->data = NULL;
 224         mmc_request_done(host->mmc, mrq);
 225 }
 226
 227 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
 228 {
 229         struct mmc_command *cmd = host->cmd;
 230         int i;
 231         u32 v;
 232
 233         if (!cmd)
 234                 return 0;
 235
 236         host->cmd = NULL;
 237
 238         /*
 239          * Did I mention this is Sick.  We always need to
 240          * discard the upper 8 bits of the first 16-bit word.
 241          */
 242         v = readl(host->base + MMC_RES) & 0xffff;
 243         for (i = 0; i < 4; i++) {
 244                 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
 245                 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
 246                 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
 247                 v = w2;
 248         }
 249
 250         if (stat & STAT_TIME_OUT_RESPONSE) {
 251                 cmd->error = -ETIMEDOUT;
 252         } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
 253 #ifdef CONFIG_PXA27x
 254                 /*
 255                  * workaround for erratum #42:
 256                  * Intel PXA27x Family Processor Specification Update Rev 001
 257                  * A bogus CRC error can appear if the msb of a 136 bit
 258                  * response is a one.
 259                  */
 260                 if (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000) {
 261                         pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
 262                 } else
 263 #endif
 264                 cmd->error = -EILSEQ;
 265         }
 266
 267         pxamci_disable_irq(host, END_CMD_RES);
 268         if (host->data && !cmd->error) {
 269                 pxamci_enable_irq(host, DATA_TRAN_DONE);
 270         } else {
 271                 pxamci_finish_request(host, host->mrq);
 272         }
 273
 274         return 1;
 275 }
 276
 277 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
 278 {
 279         struct mmc_data *data = host->data;
 280
 281         if (!data)
 282                 return 0;
 283
 284         DCSR(host->dma) = 0;
 285         dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
 286                      host->dma_dir);
 287
 288         if (stat & STAT_READ_TIME_OUT)
 289                 data->error = -ETIMEDOUT;
 290         else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
 291                 data->error = -EILSEQ;
 292
 293         /*
 294          * There appears to be a hardware design bug here.  There seems to
 295          * be no way to find out how much data was transferred to the card.
 296          * This means that if there was an error on any block, we mark all
 297          * data blocks as being in error.
 298          */
 299         if (!data->error)
 300                 data->bytes_xfered = data->blocks * data->blksz;
 301         else
 302                 data->bytes_xfered = 0;
 303
 304         pxamci_disable_irq(host, DATA_TRAN_DONE);
 305
 306         host->data = NULL;
 307         if (host->mrq->stop) {
 308                 pxamci_stop_clock(host);
 309                 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
 310         } else {
 311                 pxamci_finish_request(host, host->mrq);
 312         }
 313
 314         return 1;
 315 }
 316
 317 static irqreturn_t pxamci_irq(int irq, void *devid)
 318 {
 319         struct pxamci_host *host = devid;
 320         unsigned int ireg;
 321         int handled = 0;
 322
 323         ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
 324
 325         if (ireg) {
 326                 unsigned stat = readl(host->base + MMC_STAT);
 327
 328                 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
 329
 330                 if (ireg & END_CMD_RES)
 331                         handled |= pxamci_cmd_done(host, stat);
 332                 if (ireg & DATA_TRAN_DONE)
 333                         handled |= pxamci_data_done(host, stat);
 334                 if (ireg & SDIO_INT) {
 335                         mmc_signal_sdio_irq(host->mmc);
 336                         handled = 1;
 337                 }
 338         }
 339
 340         return IRQ_RETVAL(handled);
 341 }
 342
 343 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 344 {
 345         struct pxamci_host *host = mmc_priv(mmc);
 346         unsigned int cmdat;
 347
 348         WARN_ON(host->mrq != NULL);
 349
 350         host->mrq = mrq;
 351
 352         pxamci_stop_clock(host);
 353
 354         cmdat = host->cmdat;
 355         host->cmdat &= ~CMDAT_INIT;
 356
 357         if (mrq->data) {
 358                 pxamci_setup_data(host, mrq->data);
 359
 360                 cmdat &= ~CMDAT_BUSY;
 361                 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
 362                 if (mrq->data->flags & MMC_DATA_WRITE)
 363                         cmdat |= CMDAT_WRITE;
 364
 365                 if (mrq->data->flags & MMC_DATA_STREAM)
 366                         cmdat |= CMDAT_STREAM;
 367         }
 368
 369         pxamci_start_cmd(host, mrq->cmd, cmdat);
 370 }
 371
 372 static int pxamci_get_ro(struct mmc_host *mmc)
 373 {
 374         struct pxamci_host *host = mmc_priv(mmc);
 375
 376         if (host->pdata && host->pdata->get_ro)
 377                 return !!host->pdata->get_ro(mmc_dev(mmc));
 378         /*
 379          * Board doesn't support read only detection; let the mmc core
 380          * decide what to do.
 381          */
 382         return -ENOSYS;
 383 }
 384
 385 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 386 {
 387         struct pxamci_host *host = mmc_priv(mmc);
 388
 389         if (ios->clock) {
 390                 unsigned long rate = host->clkrate;
 391                 unsigned int clk = rate / ios->clock;
 392
 393                 if (host->clkrt == CLKRT_OFF)
 394                         clk_enable(host->clk);
 395
 396                 if (ios->clock == 26000000) {
 397                         /* to support 26MHz on pxa300/pxa310 */
 398                         host->clkrt = 7;
 399                 } else {
 400                         /* to handle (19.5MHz, 26MHz) */
 401                         if (!clk)
 402                                 clk = 1;
 403
 404                         /*
 405                          * clk might result in a lower divisor than we
 406                          * desire.  check for that condition and adjust
 407                          * as appropriate.
 408                          */
 409                         if (rate / clk > ios->clock)
 410                                 clk <<= 1;
 411                         host->clkrt = fls(clk) - 1;
 412                 }
 413
 414                 /*
 415                  * we write clkrt on the next command
 416                  */
 417         } else {
 418                 pxamci_stop_clock(host);
 419                 if (host->clkrt != CLKRT_OFF) {
 420                         host->clkrt = CLKRT_OFF;
 421                         clk_disable(host->clk);
 422                 }
 423         }
 424
 425         if (host->power_mode != ios->power_mode) {
 426                 host->power_mode = ios->power_mode;
 427
 428                 if (host->pdata && host->pdata->setpower)
 429                         host->pdata->setpower(mmc_dev(mmc), ios->vdd);
 430
 431                 if (ios->power_mode == MMC_POWER_ON)
 432                         host->cmdat |= CMDAT_INIT;
 433         }
 434
 435         if (ios->bus_width == MMC_BUS_WIDTH_4)
 436                 host->cmdat |= CMDAT_SD_4DAT;
 437         else
 438                 host->cmdat &= ~CMDAT_SD_4DAT;
 439
 440         pr_debug("PXAMCI: clkrt = %x cmdat = %x\n",
 441                  host->clkrt, host->cmdat);
 442 }
 443
 444 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
 445 {
 446         struct pxamci_host *pxa_host = mmc_priv(host);
 447
 448         if (enable)
 449                 pxamci_enable_irq(pxa_host, SDIO_INT);
 450         else
 451                 pxamci_disable_irq(pxa_host, SDIO_INT);
 452 }
 453
 454 static const struct mmc_host_ops pxamci_ops = {
 455         .request                = pxamci_request,
 456         .get_ro                 = pxamci_get_ro,
 457         .set_ios                = pxamci_set_ios,
 458         .enable_sdio_irq        = pxamci_enable_sdio_irq,
 459 };
 460
 461 static void pxamci_dma_irq(int dma, void *devid)
 462 {
 463         struct pxamci_host *host = devid;
 464         int dcsr = DCSR(dma);
 465         DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
 466
 467         if (dcsr & DCSR_ENDINTR) {
 468                 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
 469         } else {
 470                 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
 471                        mmc_hostname(host->mmc), dma, dcsr);
 472                 host->data->error = -EIO;
 473                 pxamci_data_done(host, 0);
 474         }
 475 }
 476
 477 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
 478 {
 479         struct pxamci_host *host = mmc_priv(devid);
 480
 481         mmc_detect_change(devid, host->pdata->detect_delay);
 482         return IRQ_HANDLED;
 483 }
 484
 485 static int pxamci_probe(struct platform_device *pdev)
 486 {
 487         struct mmc_host *mmc;
 488         struct pxamci_host *host = NULL;
 489         struct resource *r, *dmarx, *dmatx;
 490         int ret, irq;
 491
 492         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 493         irq = platform_get_irq(pdev, 0);
 494         if (!r || irq < 0)
 495                 return -ENXIO;
 496
 497         r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
 498         if (!r)
 499                 return -EBUSY;
 500
 501         mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
 502         if (!mmc) {
 503                 ret = -ENOMEM;
 504                 goto out;
 505         }
 506
 507         mmc->ops = &pxamci_ops;
 508
 509         /*
 510          * We can do SG-DMA, but we don't because we never know how much
 511          * data we successfully wrote to the card.
 512          */
 513         mmc->max_phys_segs = NR_SG;
 514
 515         /*
 516          * Our hardware DMA can handle a maximum of one page per SG entry.
 517          */
 518         mmc->max_seg_size = PAGE_SIZE;
 519
 520         /*
 521          * Block length register is only 10 bits before PXA27x.
 522          */
 523         mmc->max_blk_size = (cpu_is_pxa21x() || cpu_is_pxa25x()) ? 1023 : 2048;
 524
 525         /*
 526          * Block count register is 16 bits.
 527          */
 528         mmc->max_blk_count = 65535;
 529
 530         host = mmc_priv(mmc);
 531         host->mmc = mmc;
 532         host->dma = -1;
 533         host->pdata = pdev->dev.platform_data;
 534         host->clkrt = CLKRT_OFF;
 535
 536         host->clk = clk_get(&pdev->dev, "MMCCLK");
 537         if (IS_ERR(host->clk)) {
 538                 ret = PTR_ERR(host->clk);
 539                 host->clk = NULL;
 540                 goto out;
 541         }
 542
 543         host->clkrate = clk_get_rate(host->clk);
 544
 545         /*
 546          * Calculate minimum clock rate, rounding up.
 547          */
 548         mmc->f_min = (host->clkrate + 63) / 64;
 549         mmc->f_max = (cpu_is_pxa300() || cpu_is_pxa310()) ? 26000000
 550                                                           : host->clkrate;
 551
 552         mmc->ocr_avail = host->pdata ?
 553                          host->pdata->ocr_mask :
 554                          MMC_VDD_32_33|MMC_VDD_33_34;
 555         mmc->caps = 0;
 556         host->cmdat = 0;
 557         if (!cpu_is_pxa21x() && !cpu_is_pxa25x()) {
 558                 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
 559                 host->cmdat |= CMDAT_SDIO_INT_EN;
 560                 if (cpu_is_pxa300() || cpu_is_pxa310())
 561                         mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
 562                                      MMC_CAP_SD_HIGHSPEED;
 563         }
 564
 565         host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
 566         if (!host->sg_cpu) {
 567                 ret = -ENOMEM;
 568                 goto out;
 569         }
 570
 571         spin_lock_init(&host->lock);
 572         host->res = r;
 573         host->irq = irq;
 574         host->imask = MMC_I_MASK_ALL;
 575
 576         host->base = ioremap(r->start, SZ_4K);
 577         if (!host->base) {
 578                 ret = -ENOMEM;
 579                 goto out;
 580         }
 581
 582         /*
 583          * Ensure that the host controller is shut down, and setup
 584          * with our defaults.
 585          */
 586         pxamci_stop_clock(host);
 587         writel(0, host->base + MMC_SPI);
 588         writel(64, host->base + MMC_RESTO);
 589         writel(host->imask, host->base + MMC_I_MASK);
 590
 591         host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
 592                                     pxamci_dma_irq, host);
 593         if (host->dma < 0) {
 594                 ret = -EBUSY;
 595                 goto out;
 596         }
 597
 598         ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
 599         if (ret)
 600                 goto out;
 601
 602         platform_set_drvdata(pdev, mmc);
 603
 604         dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 605         if (!dmarx) {
 606                 ret = -ENXIO;
 607                 goto out;
 608         }
 609         host->dma_drcmrrx = dmarx->start;
 610
 611         dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 612         if (!dmatx) {
 613                 ret = -ENXIO;
 614                 goto out;
 615         }
 616         host->dma_drcmrtx = dmatx->start;
 617
 618         if (host->pdata && host->pdata->init)
 619                 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
 620
 621         mmc_add_host(mmc);
 622
 623         return 0;
 624
 625  out:
 626         if (host) {
 627                 if (host->dma >= 0)
 628                         pxa_free_dma(host->dma);
 629                 if (host->base)
 630                         iounmap(host->base);
 631                 if (host->sg_cpu)
 632                         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 633                 if (host->clk)
 634                         clk_put(host->clk);
 635         }
 636         if (mmc)
 637                 mmc_free_host(mmc);
 638         release_resource(r);
 639         return ret;
 640 }
 641
 642 static int pxamci_remove(struct platform_device *pdev)
 643 {
 644         struct mmc_host *mmc = platform_get_drvdata(pdev);
 645
 646         platform_set_drvdata(pdev, NULL);
 647
 648         if (mmc) {
 649                 struct pxamci_host *host = mmc_priv(mmc);
 650
 651                 if (host->pdata && host->pdata->exit)
 652                         host->pdata->exit(&pdev->dev, mmc);
 653
 654                 mmc_remove_host(mmc);
 655
 656                 pxamci_stop_clock(host);
 657                 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
 658                        END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
 659                        host->base + MMC_I_MASK);
 660
 661                 DRCMR(host->dma_drcmrrx) = 0;
 662                 DRCMR(host->dma_drcmrtx) = 0;
 663
 664                 free_irq(host->irq, host);
 665                 pxa_free_dma(host->dma);
 666                 iounmap(host->base);
 667                 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 668
 669                 clk_put(host->clk);
 670
 671                 release_resource(host->res);
 672
 673                 mmc_free_host(mmc);
 674         }
 675         return 0;
 676 }
 677
 678 #ifdef CONFIG_PM
 679 static int pxamci_suspend(struct platform_device *dev, pm_message_t state)
 680 {
 681         struct mmc_host *mmc = platform_get_drvdata(dev);
 682         int ret = 0;
 683
 684         if (mmc)
 685                 ret = mmc_suspend_host(mmc, state);
 686
 687         return ret;
 688 }
 689
 690 static int pxamci_resume(struct platform_device *dev)
 691 {
 692         struct mmc_host *mmc = platform_get_drvdata(dev);
 693         int ret = 0;
 694
 695         if (mmc)
 696                 ret = mmc_resume_host(mmc);
 697
 698         return ret;
 699 }
 700 #else
 701 #define pxamci_suspend  NULL
 702 #define pxamci_resume   NULL
 703 #endif
 704
 705 static struct platform_driver pxamci_driver = {
 706         .probe          = pxamci_probe,
 707         .remove         = pxamci_remove,
 708         .suspend        = pxamci_suspend,
 709         .resume         = pxamci_resume,
 710         .driver         = {
 711                 .name   = DRIVER_NAME,
 712                 .owner  = THIS_MODULE,
 713         },
 714 };
 715
 716 static int __init pxamci_init(void)
 717 {
 718         return platform_driver_register(&pxamci_driver);
 719 }
 720
 721 static void __exit pxamci_exit(void)
 722 {
 723         platform_driver_unregister(&pxamci_driver);
 724 }
 725
 726 module_init(pxamci_init);
 727 module_exit(pxamci_exit);
 728
 729 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
 730 MODULE_LICENSE("GPL");
 731 MODULE_ALIAS("platform:pxa2xx-mci");