kernel/drivers/mmc/host/bfin_sdh.c

   1 /*
   2  * bfin_sdh.c - Analog Devices Blackfin SDH Controller
   3  *
   4  * Copyright (C) 2007-2009 Analog Device Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #define DRIVER_NAME     "bfin-sdh"
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/ioport.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/delay.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/mmc/host.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/gfp.h>
  21
  22 #include <asm/cacheflush.h>
  23 #include <asm/dma.h>
  24 #include <asm/portmux.h>
  25 #include <asm/bfin_sdh.h>
  26
  27 #if defined(CONFIG_BF51x) || defined(__ADSPBF60x__)
  28 #define bfin_read_SDH_CLK_CTL           bfin_read_RSI_CLK_CTL
  29 #define bfin_write_SDH_CLK_CTL          bfin_write_RSI_CLK_CTL
  30 #define bfin_write_SDH_ARGUMENT         bfin_write_RSI_ARGUMENT
  31 #define bfin_write_SDH_COMMAND          bfin_write_RSI_COMMAND
  32 #define bfin_write_SDH_DATA_TIMER       bfin_write_RSI_DATA_TIMER
  33 #define bfin_read_SDH_RESPONSE0         bfin_read_RSI_RESPONSE0
  34 #define bfin_read_SDH_RESPONSE1         bfin_read_RSI_RESPONSE1
  35 #define bfin_read_SDH_RESPONSE2         bfin_read_RSI_RESPONSE2
  36 #define bfin_read_SDH_RESPONSE3         bfin_read_RSI_RESPONSE3
  37 #define bfin_write_SDH_DATA_LGTH        bfin_write_RSI_DATA_LGTH
  38 #define bfin_read_SDH_DATA_CTL          bfin_read_RSI_DATA_CTL
  39 #define bfin_write_SDH_DATA_CTL         bfin_write_RSI_DATA_CTL
  40 #define bfin_read_SDH_DATA_CNT          bfin_read_RSI_DATA_CNT
  41 #define bfin_write_SDH_STATUS_CLR       bfin_write_RSI_STATUS_CLR
  42 #define bfin_read_SDH_E_STATUS          bfin_read_RSI_E_STATUS
  43 #define bfin_write_SDH_E_STATUS         bfin_write_RSI_E_STATUS
  44 #define bfin_read_SDH_STATUS            bfin_read_RSI_STATUS
  45 #define bfin_write_SDH_MASK0            bfin_write_RSI_MASK0
  46 #define bfin_write_SDH_E_MASK           bfin_write_RSI_E_MASK
  47 #define bfin_read_SDH_CFG               bfin_read_RSI_CFG
  48 #define bfin_write_SDH_CFG              bfin_write_RSI_CFG
  49 # if defined(__ADSPBF60x__)
  50 #  define bfin_read_SDH_BLK_SIZE        bfin_read_RSI_BLKSZ
  51 #  define bfin_write_SDH_BLK_SIZE       bfin_write_RSI_BLKSZ
  52 # else
  53 #  define bfin_read_SDH_PWR_CTL         bfin_read_RSI_PWR_CTL
  54 #  define bfin_write_SDH_PWR_CTL        bfin_write_RSI_PWR_CTL
  55 # endif
  56 #endif
  57
  58 struct sdh_host {
  59         struct mmc_host         *mmc;
  60         spinlock_t              lock;
  61         struct resource         *res;
  62         void __iomem            *base;
  63         int                     irq;
  64         int                     stat_irq;
  65         int                     dma_ch;
  66         int                     dma_dir;
  67         struct dma_desc_array   *sg_cpu;
  68         dma_addr_t              sg_dma;
  69         int                     dma_len;
  70
  71         unsigned long           sclk;
  72         unsigned int            imask;
  73         unsigned int            power_mode;
  74         unsigned int            clk_div;
  75
  76         struct mmc_request      *mrq;
  77         struct mmc_command      *cmd;
  78         struct mmc_data         *data;
  79 };
  80
  81 static struct bfin_sd_host *get_sdh_data(struct platform_device *pdev)
  82 {
  83         return pdev->dev.platform_data;
  84 }
  85
  86 static void sdh_stop_clock(struct sdh_host *host)
  87 {
  88         bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() & ~CLK_E);
  89         SSYNC();
  90 }
  91
  92 static void sdh_enable_stat_irq(struct sdh_host *host, unsigned int mask)
  93 {
  94         unsigned long flags;
  95
  96         spin_lock_irqsave(&host->lock, flags);
  97         host->imask |= mask;
  98         bfin_write_SDH_MASK0(mask);
  99         SSYNC();
 100         spin_unlock_irqrestore(&host->lock, flags);
 101 }
 102
 103 static void sdh_disable_stat_irq(struct sdh_host *host, unsigned int mask)
 104 {
 105         unsigned long flags;
 106
 107         spin_lock_irqsave(&host->lock, flags);
 108         host->imask &= ~mask;
 109         bfin_write_SDH_MASK0(host->imask);
 110         SSYNC();
 111         spin_unlock_irqrestore(&host->lock, flags);
 112 }
 113
 114 static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
 115 {
 116         unsigned int length;
 117         unsigned int data_ctl;
 118         unsigned int dma_cfg;
 119         unsigned int cycle_ns, timeout;
 120
 121         dev_dbg(mmc_dev(host->mmc), "%s enter flags: 0x%x\n", __func__, data->flags);
 122         host->data = data;
 123         data_ctl = 0;
 124         dma_cfg = 0;
 125
 126         length = data->blksz * data->blocks;
 127         bfin_write_SDH_DATA_LGTH(length);
 128
 129         if (data->flags & MMC_DATA_STREAM)
 130                 data_ctl |= DTX_MODE;
 131
 132         if (data->flags & MMC_DATA_READ)
 133                 data_ctl |= DTX_DIR;
 134         /* Only supports power-of-2 block size */
 135         if (data->blksz & (data->blksz - 1))
 136                 return -EINVAL;
 137 #ifndef RSI_BLKSZ
 138         data_ctl |= ((ffs(data->blksz) - 1) << 4);
 139 #else
 140         bfin_write_SDH_BLK_SIZE(data->blksz);
 141 #endif
 142
 143         bfin_write_SDH_DATA_CTL(data_ctl);
 144         /* the time of a host clock period in ns */
 145         cycle_ns = 1000000000 / (host->sclk / (2 * (host->clk_div + 1)));
 146         timeout = data->timeout_ns / cycle_ns;
 147         timeout += data->timeout_clks;
 148         bfin_write_SDH_DATA_TIMER(timeout);
 149         SSYNC();
 150
 151         if (data->flags & MMC_DATA_READ) {
 152                 host->dma_dir = DMA_FROM_DEVICE;
 153                 dma_cfg |= WNR;
 154         } else
 155                 host->dma_dir = DMA_TO_DEVICE;
 156
 157         sdh_enable_stat_irq(host, (DAT_CRC_FAIL | DAT_TIME_OUT | DAT_END));
 158         host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma_dir);
 159 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
 160         dma_cfg |= DMAFLOW_ARRAY | RESTART | WDSIZE_32 | DMAEN;
 161 # ifdef RSI_BLKSZ
 162         dma_cfg |= PSIZE_32 | NDSIZE_3;
 163 # else
 164         dma_cfg |= NDSIZE_5;
 165 # endif
 166         {
 167                 struct scatterlist *sg;
 168                 int i;
 169                 for_each_sg(data->sg, sg, host->dma_len, i) {
 170                         host->sg_cpu[i].start_addr = sg_dma_address(sg);
 171                         host->sg_cpu[i].cfg = dma_cfg;
 172                         host->sg_cpu[i].x_count = sg_dma_len(sg) / 4;
 173                         host->sg_cpu[i].x_modify = 4;
 174                         dev_dbg(mmc_dev(host->mmc), "%d: start_addr:0x%lx, "
 175                                 "cfg:0x%lx, x_count:0x%lx, x_modify:0x%lx\n",
 176                                 i, host->sg_cpu[i].start_addr,
 177                                 host->sg_cpu[i].cfg, host->sg_cpu[i].x_count,
 178                                 host->sg_cpu[i].x_modify);
 179                 }
 180         }
 181         flush_dcache_range((unsigned int)host->sg_cpu,
 182                 (unsigned int)host->sg_cpu +
 183                         host->dma_len * sizeof(struct dma_desc_array));
 184         /* Set the last descriptor to stop mode */
 185         host->sg_cpu[host->dma_len - 1].cfg &= ~(DMAFLOW | NDSIZE);
 186         host->sg_cpu[host->dma_len - 1].cfg |= DI_EN;
 187
 188         set_dma_curr_desc_addr(host->dma_ch, (unsigned long *)host->sg_dma);
 189         set_dma_x_count(host->dma_ch, 0);
 190         set_dma_x_modify(host->dma_ch, 0);
 191         SSYNC();
 192         set_dma_config(host->dma_ch, dma_cfg);
 193 #elif defined(CONFIG_BF51x)
 194         /* RSI DMA doesn't work in array mode */
 195         dma_cfg |= WDSIZE_32 | DMAEN;
 196         set_dma_start_addr(host->dma_ch, sg_dma_address(&data->sg[0]));
 197         set_dma_x_count(host->dma_ch, length / 4);
 198         set_dma_x_modify(host->dma_ch, 4);
 199         SSYNC();
 200         set_dma_config(host->dma_ch, dma_cfg);
 201 #endif
 202         bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
 203
 204         SSYNC();
 205
 206         dev_dbg(mmc_dev(host->mmc), "%s exit\n", __func__);
 207         return 0;
 208 }
 209
 210 static void sdh_start_cmd(struct sdh_host *host, struct mmc_command *cmd)
 211 {
 212         unsigned int sdh_cmd;
 213         unsigned int stat_mask;
 214
 215         dev_dbg(mmc_dev(host->mmc), "%s enter cmd: 0x%p\n", __func__, cmd);
 216         WARN_ON(host->cmd != NULL);
 217         host->cmd = cmd;
 218
 219         sdh_cmd = 0;
 220         stat_mask = 0;
 221
 222         sdh_cmd |= cmd->opcode;
 223
 224         if (cmd->flags & MMC_RSP_PRESENT) {
 225                 sdh_cmd |= CMD_RSP;
 226                 stat_mask |= CMD_RESP_END;
 227         } else {
 228                 stat_mask |= CMD_SENT;
 229         }
 230
 231         if (cmd->flags & MMC_RSP_136)
 232                 sdh_cmd |= CMD_L_RSP;
 233
 234         stat_mask |= CMD_CRC_FAIL | CMD_TIME_OUT;
 235
 236         sdh_enable_stat_irq(host, stat_mask);
 237
 238         bfin_write_SDH_ARGUMENT(cmd->arg);
 239         bfin_write_SDH_COMMAND(sdh_cmd | CMD_E);
 240         bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() | CLK_E);
 241         SSYNC();
 242 }
 243
 244 static void sdh_finish_request(struct sdh_host *host, struct mmc_request *mrq)
 245 {
 246         dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__);
 247         host->mrq = NULL;
 248         host->cmd = NULL;
 249         host->data = NULL;
 250         mmc_request_done(host->mmc, mrq);
 251 }
 252
 253 static int sdh_cmd_done(struct sdh_host *host, unsigned int stat)
 254 {
 255         struct mmc_command *cmd = host->cmd;
 256         int ret = 0;
 257
 258         dev_dbg(mmc_dev(host->mmc), "%s enter cmd: %p\n", __func__, cmd);
 259         if (!cmd)
 260                 return 0;
 261
 262         host->cmd = NULL;
 263
 264         if (cmd->flags & MMC_RSP_PRESENT) {
 265                 cmd->resp[0] = bfin_read_SDH_RESPONSE0();
 266                 if (cmd->flags & MMC_RSP_136) {
 267                         cmd->resp[1] = bfin_read_SDH_RESPONSE1();
 268                         cmd->resp[2] = bfin_read_SDH_RESPONSE2();
 269                         cmd->resp[3] = bfin_read_SDH_RESPONSE3();
 270                 }
 271         }
 272         if (stat & CMD_TIME_OUT)
 273                 cmd->error = -ETIMEDOUT;
 274         else if (stat & CMD_CRC_FAIL && cmd->flags & MMC_RSP_CRC)
 275                 cmd->error = -EILSEQ;
 276
 277         sdh_disable_stat_irq(host, (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL));
 278
 279         if (host->data && !cmd->error) {
 280                 if (host->data->flags & MMC_DATA_WRITE) {
 281                         ret = sdh_setup_data(host, host->data);
 282                         if (ret)
 283                                 return 0;
 284                 }
 285
 286                 sdh_enable_stat_irq(host, DAT_END | RX_OVERRUN | TX_UNDERRUN | DAT_TIME_OUT);
 287         } else
 288                 sdh_finish_request(host, host->mrq);
 289
 290         return 1;
 291 }
 292
 293 static int sdh_data_done(struct sdh_host *host, unsigned int stat)
 294 {
 295         struct mmc_data *data = host->data;
 296
 297         dev_dbg(mmc_dev(host->mmc), "%s enter stat: 0x%x\n", __func__, stat);
 298         if (!data)
 299                 return 0;
 300
 301         disable_dma(host->dma_ch);
 302         dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 303                      host->dma_dir);
 304
 305         if (stat & DAT_TIME_OUT)
 306                 data->error = -ETIMEDOUT;
 307         else if (stat & DAT_CRC_FAIL)
 308                 data->error = -EILSEQ;
 309         else if (stat & (RX_OVERRUN | TX_UNDERRUN))
 310                 data->error = -EIO;
 311
 312         if (!data->error)
 313                 data->bytes_xfered = data->blocks * data->blksz;
 314         else
 315                 data->bytes_xfered = 0;
 316
 317         bfin_write_SDH_STATUS_CLR(DAT_END_STAT | DAT_TIMEOUT_STAT | \
 318                         DAT_CRC_FAIL_STAT | DAT_BLK_END_STAT | RX_OVERRUN | TX_UNDERRUN);
 319         bfin_write_SDH_DATA_CTL(0);
 320         SSYNC();
 321
 322         host->data = NULL;
 323         if (host->mrq->stop) {
 324                 sdh_stop_clock(host);
 325                 sdh_start_cmd(host, host->mrq->stop);
 326         } else {
 327                 sdh_finish_request(host, host->mrq);
 328         }
 329
 330         return 1;
 331 }
 332
 333 static void sdh_request(struct mmc_host *mmc, struct mmc_request *mrq)
 334 {
 335         struct sdh_host *host = mmc_priv(mmc);
 336         int ret = 0;
 337
 338         dev_dbg(mmc_dev(host->mmc), "%s enter, mrp:%p, cmd:%p\n", __func__, mrq, mrq->cmd);
 339         WARN_ON(host->mrq != NULL);
 340
 341         spin_lock(&host->lock);
 342         host->mrq = mrq;
 343         host->data = mrq->data;
 344
 345         if (mrq->data && mrq->data->flags & MMC_DATA_READ) {
 346                 ret = sdh_setup_data(host, mrq->data);
 347                 if (ret)
 348                         goto data_err;
 349         }
 350
 351         sdh_start_cmd(host, mrq->cmd);
 352 data_err:
 353         spin_unlock(&host->lock);
 354 }
 355
 356 static void sdh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 357 {
 358         struct sdh_host *host;
 359         u16 clk_ctl = 0;
 360 #ifndef RSI_BLKSZ
 361         u16 pwr_ctl = 0;
 362 #endif
 363         u16 cfg;
 364         host = mmc_priv(mmc);
 365
 366         spin_lock(&host->lock);
 367
 368         cfg = bfin_read_SDH_CFG();
 369         cfg |= MWE;
 370         switch (ios->bus_width) {
 371         case MMC_BUS_WIDTH_4:
 372 #ifndef RSI_BLKSZ
 373                 cfg &= ~PD_SDDAT3;
 374 #endif
 375                 cfg |= PUP_SDDAT3;
 376                 /* Enable 4 bit SDIO */
 377                 cfg |= SD4E;
 378                 clk_ctl |= WIDE_BUS_4;
 379                 break;
 380         case MMC_BUS_WIDTH_8:
 381 #ifndef RSI_BLKSZ
 382                 cfg &= ~PD_SDDAT3;
 383 #endif
 384                 cfg |= PUP_SDDAT3;
 385                 /* Disable 4 bit SDIO */
 386                 cfg &= ~SD4E;
 387                 clk_ctl |= BYTE_BUS_8;
 388                 break;
 389         default:
 390                 cfg &= ~PUP_SDDAT3;
 391                 /* Disable 4 bit SDIO */
 392                 cfg &= ~SD4E;
 393         }
 394         bfin_write_SDH_CFG(cfg);
 395
 396         host->power_mode = ios->power_mode;
 397 #ifndef RSI_BLKSZ
 398         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
 399                 pwr_ctl |= ROD_CTL;
 400 # ifndef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
 401                 pwr_ctl |= SD_CMD_OD;
 402 # endif
 403         }
 404
 405         if (ios->power_mode != MMC_POWER_OFF)
 406                 pwr_ctl |= PWR_ON;
 407         else
 408                 pwr_ctl &= ~PWR_ON;
 409
 410         bfin_write_SDH_PWR_CTL(pwr_ctl);
 411 #else
 412 # ifndef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
 413         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 414                 cfg |= SD_CMD_OD;
 415         else
 416                 cfg &= ~SD_CMD_OD;
 417 # endif
 418
 419         if (ios->power_mode != MMC_POWER_OFF)
 420                 cfg |= PWR_ON;
 421         else
 422                 cfg &= ~PWR_ON;
 423
 424         bfin_write_SDH_CFG(cfg);
 425 #endif
 426         SSYNC();
 427
 428         if (ios->power_mode == MMC_POWER_ON && ios->clock) {
 429                 unsigned char clk_div;
 430                 clk_div = (get_sclk() / ios->clock - 1) / 2;
 431                 clk_div = min_t(unsigned char, clk_div, 0xFF);
 432                 clk_ctl |= clk_div;
 433                 clk_ctl |= CLK_E;
 434                 host->clk_div = clk_div;
 435                 bfin_write_SDH_CLK_CTL(clk_ctl);
 436         } else
 437                 sdh_stop_clock(host);
 438
 439         /* set up sdh interrupt mask*/
 440         if (ios->power_mode == MMC_POWER_ON)
 441                 bfin_write_SDH_MASK0(DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL |
 442                         RX_OVERRUN | TX_UNDERRUN | CMD_SENT | CMD_RESP_END |
 443                         CMD_TIME_OUT | CMD_CRC_FAIL);
 444         else
 445                 bfin_write_SDH_MASK0(0);
 446         SSYNC();
 447
 448         spin_unlock(&host->lock);
 449
 450         dev_dbg(mmc_dev(host->mmc), "SDH: clk_div = 0x%x actual clock:%ld expected clock:%d\n",
 451                 host->clk_div,
 452                 host->clk_div ? get_sclk() / (2 * (host->clk_div + 1)) : 0,
 453                 ios->clock);
 454 }
 455
 456 static const struct mmc_host_ops sdh_ops = {
 457         .request        = sdh_request,
 458         .set_ios        = sdh_set_ios,
 459 };
 460
 461 static irqreturn_t sdh_dma_irq(int irq, void *devid)
 462 {
 463         struct sdh_host *host = devid;
 464
 465         dev_dbg(mmc_dev(host->mmc), "%s enter, irq_stat: 0x%04lx\n", __func__,
 466                 get_dma_curr_irqstat(host->dma_ch));
 467         clear_dma_irqstat(host->dma_ch);
 468         SSYNC();
 469
 470         return IRQ_HANDLED;
 471 }
 472
 473 static irqreturn_t sdh_stat_irq(int irq, void *devid)
 474 {
 475         struct sdh_host *host = devid;
 476         unsigned int status;
 477         int handled = 0;
 478
 479         dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__);
 480
 481         spin_lock(&host->lock);
 482
 483         status = bfin_read_SDH_E_STATUS();
 484         if (status & SD_CARD_DET) {
 485                 mmc_detect_change(host->mmc, 0);
 486                 bfin_write_SDH_E_STATUS(SD_CARD_DET);
 487         }
 488         status = bfin_read_SDH_STATUS();
 489         if (status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL)) {
 490                 handled |= sdh_cmd_done(host, status);
 491                 bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT | \
 492                                 CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT);
 493                 SSYNC();
 494         }
 495
 496         status = bfin_read_SDH_STATUS();
 497         if (status & (DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN))
 498                 handled |= sdh_data_done(host, status);
 499
 500         spin_unlock(&host->lock);
 501
 502         dev_dbg(mmc_dev(host->mmc), "%s exit\n\n", __func__);
 503
 504         return IRQ_RETVAL(handled);
 505 }
 506
 507 static void sdh_reset(void)
 508 {
 509 #if defined(CONFIG_BF54x)
 510         /* Secure Digital Host shares DMA with Nand controller */
 511         bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
 512 #endif
 513
 514         bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
 515         SSYNC();
 516
 517         /* Disable card inserting detection pin. set MMC_CAP_NEEDS_POLL, and
 518          * mmc stack will do the detection.
 519          */
 520         bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3));
 521         SSYNC();
 522 }
 523
 524 static int sdh_probe(struct platform_device *pdev)
 525 {
 526         struct mmc_host *mmc;
 527         struct sdh_host *host;
 528         struct bfin_sd_host *drv_data = get_sdh_data(pdev);
 529         int ret;
 530
 531         if (!drv_data) {
 532                 dev_err(&pdev->dev, "missing platform driver data\n");
 533                 ret = -EINVAL;
 534                 goto out;
 535         }
 536
 537         mmc = mmc_alloc_host(sizeof(struct sdh_host), &pdev->dev);
 538         if (!mmc) {
 539                 ret = -ENOMEM;
 540                 goto out;
 541         }
 542
 543         mmc->ops = &sdh_ops;
 544 #if defined(CONFIG_BF51x)
 545         mmc->max_segs = 1;
 546 #else
 547         mmc->max_segs = PAGE_SIZE / sizeof(struct dma_desc_array);
 548 #endif
 549 #ifdef RSI_BLKSZ
 550         mmc->max_seg_size = -1;
 551 #else
 552         mmc->max_seg_size = 1 << 16;
 553 #endif
 554         mmc->max_blk_size = 1 << 11;
 555         mmc->max_blk_count = 1 << 11;
 556         mmc->max_req_size = PAGE_SIZE;
 557         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 558         mmc->f_max = get_sclk();
 559         mmc->f_min = mmc->f_max >> 9;
 560         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_NEEDS_POLL;
 561         host = mmc_priv(mmc);
 562         host->mmc = mmc;
 563         host->sclk = get_sclk();
 564
 565         spin_lock_init(&host->lock);
 566         host->irq = drv_data->irq_int0;
 567         host->dma_ch = drv_data->dma_chan;
 568
 569         ret = request_dma(host->dma_ch, DRIVER_NAME "DMA");
 570         if (ret) {
 571                 dev_err(&pdev->dev, "unable to request DMA channel\n");
 572                 goto out1;
 573         }
 574
 575         ret = set_dma_callback(host->dma_ch, sdh_dma_irq, host);
 576         if (ret) {
 577                 dev_err(&pdev->dev, "unable to request DMA irq\n");
 578                 goto out2;
 579         }
 580
 581         host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
 582         if (host->sg_cpu == NULL) {
 583                 ret = -ENOMEM;
 584                 goto out2;
 585         }
 586
 587         platform_set_drvdata(pdev, mmc);
 588
 589         ret = request_irq(host->irq, sdh_stat_irq, 0, "SDH Status IRQ", host);
 590         if (ret) {
 591                 dev_err(&pdev->dev, "unable to request status irq\n");
 592                 goto out3;
 593         }
 594
 595         ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME);
 596         if (ret) {
 597                 dev_err(&pdev->dev, "unable to request peripheral pins\n");
 598                 goto out4;
 599         }
 600
 601         sdh_reset();
 602
 603         mmc_add_host(mmc);
 604         return 0;
 605
 606 out4:
 607         free_irq(host->irq, host);
 608 out3:
 609         mmc_remove_host(mmc);
 610         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 611 out2:
 612         free_dma(host->dma_ch);
 613 out1:
 614         mmc_free_host(mmc);
 615  out:
 616         return ret;
 617 }
 618
 619 static int sdh_remove(struct platform_device *pdev)
 620 {
 621         struct mmc_host *mmc = platform_get_drvdata(pdev);
 622
 623         if (mmc) {
 624                 struct sdh_host *host = mmc_priv(mmc);
 625
 626                 mmc_remove_host(mmc);
 627
 628                 sdh_stop_clock(host);
 629                 free_irq(host->irq, host);
 630                 free_dma(host->dma_ch);
 631                 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 632
 633                 mmc_free_host(mmc);
 634         }
 635
 636         return 0;
 637 }
 638
 639 #ifdef CONFIG_PM
 640 static int sdh_suspend(struct platform_device *dev, pm_message_t state)
 641 {
 642         struct bfin_sd_host *drv_data = get_sdh_data(dev);
 643
 644         peripheral_free_list(drv_data->pin_req);
 645
 646         return 0;
 647 }
 648
 649 static int sdh_resume(struct platform_device *dev)
 650 {
 651         struct bfin_sd_host *drv_data = get_sdh_data(dev);
 652         int ret = 0;
 653
 654         ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME);
 655         if (ret) {
 656                 dev_err(&dev->dev, "unable to request peripheral pins\n");
 657                 return ret;
 658         }
 659
 660         sdh_reset();
 661         return ret;
 662 }
 663 #else
 664 # define sdh_suspend NULL
 665 # define sdh_resume  NULL
 666 #endif
 667
 668 static struct platform_driver sdh_driver = {
 669         .probe   = sdh_probe,
 670         .remove  = sdh_remove,
 671         .suspend = sdh_suspend,
 672         .resume  = sdh_resume,
 673         .driver  = {
 674                 .name = DRIVER_NAME,
 675         },
 676 };
 677
 678 module_platform_driver(sdh_driver);
 679
 680 MODULE_DESCRIPTION("Blackfin Secure Digital Host Driver");
 681 MODULE_AUTHOR("Cliff Cai, Roy Huang");
 682 MODULE_LICENSE("GPL");