drivers/mmc/host/jz4740_mmc.c

   1 /*
   2  *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *  Copyright (C) 2013, Imagination Technologies
   4  *
   5  *  JZ4740 SD/MMC controller driver
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  *  You should have received a copy of the  GNU General Public License along
  13  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  14  *  675 Mass Ave, Cambridge, MA 02139, USA.
  15  *
  16  */
  17
  18 #include <linux/bitops.h>
  19 #include <linux/clk.h>
  20 #include <linux/delay.h>
  21 #include <linux/dmaengine.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/err.h>
  24 #include <linux/gpio.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/irq.h>
  28 #include <linux/mmc/host.h>
  29 #include <linux/mmc/slot-gpio.h>
  30 #include <linux/module.h>
  31 #include <linux/of_device.h>
  32 #include <linux/pinctrl/consumer.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/scatterlist.h>
  35
  36 #include <asm/cacheflush.h>
  37
  38 #include <asm/mach-jz4740/dma.h>
  39 #include <asm/mach-jz4740/jz4740_mmc.h>
  40
  41 #define JZ_REG_MMC_STRPCL       0x00
  42 #define JZ_REG_MMC_STATUS       0x04
  43 #define JZ_REG_MMC_CLKRT        0x08
  44 #define JZ_REG_MMC_CMDAT        0x0C
  45 #define JZ_REG_MMC_RESTO        0x10
  46 #define JZ_REG_MMC_RDTO         0x14
  47 #define JZ_REG_MMC_BLKLEN       0x18
  48 #define JZ_REG_MMC_NOB          0x1C
  49 #define JZ_REG_MMC_SNOB         0x20
  50 #define JZ_REG_MMC_IMASK        0x24
  51 #define JZ_REG_MMC_IREG         0x28
  52 #define JZ_REG_MMC_CMD          0x2C
  53 #define JZ_REG_MMC_ARG          0x30
  54 #define JZ_REG_MMC_RESP_FIFO    0x34
  55 #define JZ_REG_MMC_RXFIFO       0x38
  56 #define JZ_REG_MMC_TXFIFO       0x3C
  57 #define JZ_REG_MMC_DMAC         0x44
  58
  59 #define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
  60 #define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
  61 #define JZ_MMC_STRPCL_START_READWAIT BIT(5)
  62 #define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
  63 #define JZ_MMC_STRPCL_RESET BIT(3)
  64 #define JZ_MMC_STRPCL_START_OP BIT(2)
  65 #define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
  66 #define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
  67 #define JZ_MMC_STRPCL_CLOCK_START BIT(1)
  68
  69
  70 #define JZ_MMC_STATUS_IS_RESETTING BIT(15)
  71 #define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
  72 #define JZ_MMC_STATUS_PRG_DONE BIT(13)
  73 #define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
  74 #define JZ_MMC_STATUS_END_CMD_RES BIT(11)
  75 #define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
  76 #define JZ_MMC_STATUS_IS_READWAIT BIT(9)
  77 #define JZ_MMC_STATUS_CLK_EN BIT(8)
  78 #define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
  79 #define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
  80 #define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
  81 #define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
  82 #define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
  83 #define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
  84 #define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
  85 #define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
  86
  87 #define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
  88 #define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
  89
  90
  91 #define JZ_MMC_CMDAT_IO_ABORT BIT(11)
  92 #define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
  93 #define JZ_MMC_CMDAT_DMA_EN BIT(8)
  94 #define JZ_MMC_CMDAT_INIT BIT(7)
  95 #define JZ_MMC_CMDAT_BUSY BIT(6)
  96 #define JZ_MMC_CMDAT_STREAM BIT(5)
  97 #define JZ_MMC_CMDAT_WRITE BIT(4)
  98 #define JZ_MMC_CMDAT_DATA_EN BIT(3)
  99 #define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
 100 #define JZ_MMC_CMDAT_RSP_R1 1
 101 #define JZ_MMC_CMDAT_RSP_R2 2
 102 #define JZ_MMC_CMDAT_RSP_R3 3
 103
 104 #define JZ_MMC_IRQ_SDIO BIT(7)
 105 #define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
 106 #define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
 107 #define JZ_MMC_IRQ_END_CMD_RES BIT(2)
 108 #define JZ_MMC_IRQ_PRG_DONE BIT(1)
 109 #define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
 110
 111 #define JZ_MMC_DMAC_DMA_SEL BIT(1)
 112 #define JZ_MMC_DMAC_DMA_EN BIT(0)
 113
 114 #define JZ_MMC_CLK_RATE 24000000
 115
 116 enum jz4740_mmc_version {
 117         JZ_MMC_JZ4740,
 118         JZ_MMC_JZ4750,
 119         JZ_MMC_JZ4780,
 120 };
 121
 122 enum jz4740_mmc_state {
 123         JZ4740_MMC_STATE_READ_RESPONSE,
 124         JZ4740_MMC_STATE_TRANSFER_DATA,
 125         JZ4740_MMC_STATE_SEND_STOP,
 126         JZ4740_MMC_STATE_DONE,
 127 };
 128
 129 struct jz4740_mmc_host_next {
 130         int sg_len;
 131         s32 cookie;
 132 };
 133
 134 struct jz4740_mmc_host {
 135         struct mmc_host *mmc;
 136         struct platform_device *pdev;
 137         struct jz4740_mmc_platform_data *pdata;
 138         struct clk *clk;
 139
 140         enum jz4740_mmc_version version;
 141
 142         int irq;
 143         int card_detect_irq;
 144
 145         void __iomem *base;
 146         struct resource *mem_res;
 147         struct mmc_request *req;
 148         struct mmc_command *cmd;
 149
 150         unsigned long waiting;
 151
 152         uint32_t cmdat;
 153
 154         uint32_t irq_mask;
 155
 156         spinlock_t lock;
 157
 158         struct timer_list timeout_timer;
 159         struct sg_mapping_iter miter;
 160         enum jz4740_mmc_state state;
 161
 162         /* DMA support */
 163         struct dma_chan *dma_rx;
 164         struct dma_chan *dma_tx;
 165         struct jz4740_mmc_host_next next_data;
 166         bool use_dma;
 167         int sg_len;
 168
 169 /* The DMA trigger level is 8 words, that is to say, the DMA read
 170  * trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
 171  * trigger is when data words in MSC_TXFIFO is < 8.
 172  */
 173 #define JZ4740_MMC_FIFO_HALF_SIZE 8
 174 };
 175
 176 static void jz4740_mmc_write_irq_mask(struct jz4740_mmc_host *host,
 177                                       uint32_t val)
 178 {
 179         if (host->version >= JZ_MMC_JZ4750)
 180                 return writel(val, host->base + JZ_REG_MMC_IMASK);
 181         else
 182                 return writew(val, host->base + JZ_REG_MMC_IMASK);
 183 }
 184
 185 static void jz4740_mmc_write_irq_reg(struct jz4740_mmc_host *host,
 186                                      uint32_t val)
 187 {
 188         if (host->version >= JZ_MMC_JZ4780)
 189                 return writel(val, host->base + JZ_REG_MMC_IREG);
 190         else
 191                 return writew(val, host->base + JZ_REG_MMC_IREG);
 192 }
 193
 194 static uint32_t jz4740_mmc_read_irq_reg(struct jz4740_mmc_host *host)
 195 {
 196         if (host->version >= JZ_MMC_JZ4780)
 197                 return readl(host->base + JZ_REG_MMC_IREG);
 198         else
 199                 return readw(host->base + JZ_REG_MMC_IREG);
 200 }
 201
 202 /*----------------------------------------------------------------------------*/
 203 /* DMA infrastructure */
 204
 205 static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host)
 206 {
 207         if (!host->use_dma)
 208                 return;
 209
 210         dma_release_channel(host->dma_tx);
 211         dma_release_channel(host->dma_rx);
 212 }
 213
 214 static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host)
 215 {
 216         host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
 217         if (IS_ERR(host->dma_tx)) {
 218                 dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
 219                 return PTR_ERR(host->dma_tx);
 220         }
 221
 222         host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
 223         if (IS_ERR(host->dma_rx)) {
 224                 dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
 225                 dma_release_channel(host->dma_tx);
 226                 return PTR_ERR(host->dma_rx);
 227         }
 228
 229         /* Initialize DMA pre request cookie */
 230         host->next_data.cookie = 1;
 231
 232         return 0;
 233 }
 234
 235 static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host,
 236                                                        struct mmc_data *data)
 237 {
 238         return (data->flags & MMC_DATA_READ) ? host->dma_rx : host->dma_tx;
 239 }
 240
 241 static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host,
 242                                  struct mmc_data *data)
 243 {
 244         struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 245         enum dma_data_direction dir = mmc_get_dma_dir(data);
 246
 247         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
 248 }
 249
 250 /* Prepares DMA data for current/next transfer, returns non-zero on failure */
 251 static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
 252                                        struct mmc_data *data,
 253                                        struct jz4740_mmc_host_next *next,
 254                                        struct dma_chan *chan)
 255 {
 256         struct jz4740_mmc_host_next *next_data = &host->next_data;
 257         enum dma_data_direction dir = mmc_get_dma_dir(data);
 258         int sg_len;
 259
 260         if (!next && data->host_cookie &&
 261             data->host_cookie != host->next_data.cookie) {
 262                 dev_warn(mmc_dev(host->mmc),
 263                          "[%s] invalid cookie: data->host_cookie %d host->next_data.cookie %d\n",
 264                          __func__,
 265                          data->host_cookie,
 266                          host->next_data.cookie);
 267                 data->host_cookie = 0;
 268         }
 269
 270         /* Check if next job is already prepared */
 271         if (next || data->host_cookie != host->next_data.cookie) {
 272                 sg_len = dma_map_sg(chan->device->dev,
 273                                     data->sg,
 274                                     data->sg_len,
 275                                     dir);
 276
 277         } else {
 278                 sg_len = next_data->sg_len;
 279                 next_data->sg_len = 0;
 280         }
 281
 282         if (sg_len <= 0) {
 283                 dev_err(mmc_dev(host->mmc),
 284                         "Failed to map scatterlist for DMA operation\n");
 285                 return -EINVAL;
 286         }
 287
 288         if (next) {
 289                 next->sg_len = sg_len;
 290                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
 291         } else
 292                 host->sg_len = sg_len;
 293
 294         return 0;
 295 }
 296
 297 static int jz4740_mmc_start_dma_transfer(struct jz4740_mmc_host *host,
 298                                          struct mmc_data *data)
 299 {
 300         int ret;
 301         struct dma_chan *chan;
 302         struct dma_async_tx_descriptor *desc;
 303         struct dma_slave_config conf = {
 304                 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 305                 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 306                 .src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
 307                 .dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
 308         };
 309
 310         if (data->flags & MMC_DATA_WRITE) {
 311                 conf.direction = DMA_MEM_TO_DEV;
 312                 conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
 313                 conf.slave_id = JZ4740_DMA_TYPE_MMC_TRANSMIT;
 314                 chan = host->dma_tx;
 315         } else {
 316                 conf.direction = DMA_DEV_TO_MEM;
 317                 conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
 318                 conf.slave_id = JZ4740_DMA_TYPE_MMC_RECEIVE;
 319                 chan = host->dma_rx;
 320         }
 321
 322         ret = jz4740_mmc_prepare_dma_data(host, data, NULL, chan);
 323         if (ret)
 324                 return ret;
 325
 326         dmaengine_slave_config(chan, &conf);
 327         desc = dmaengine_prep_slave_sg(chan,
 328                                        data->sg,
 329                                        host->sg_len,
 330                                        conf.direction,
 331                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 332         if (!desc) {
 333                 dev_err(mmc_dev(host->mmc),
 334                         "Failed to allocate DMA %s descriptor",
 335                          conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
 336                 goto dma_unmap;
 337         }
 338
 339         dmaengine_submit(desc);
 340         dma_async_issue_pending(chan);
 341
 342         return 0;
 343
 344 dma_unmap:
 345         jz4740_mmc_dma_unmap(host, data);
 346         return -ENOMEM;
 347 }
 348
 349 static void jz4740_mmc_pre_request(struct mmc_host *mmc,
 350                                    struct mmc_request *mrq)
 351 {
 352         struct jz4740_mmc_host *host = mmc_priv(mmc);
 353         struct mmc_data *data = mrq->data;
 354         struct jz4740_mmc_host_next *next_data = &host->next_data;
 355
 356         BUG_ON(data->host_cookie);
 357
 358         if (host->use_dma) {
 359                 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 360
 361                 if (jz4740_mmc_prepare_dma_data(host, data, next_data, chan))
 362                         data->host_cookie = 0;
 363         }
 364 }
 365
 366 static void jz4740_mmc_post_request(struct mmc_host *mmc,
 367                                     struct mmc_request *mrq,
 368                                     int err)
 369 {
 370         struct jz4740_mmc_host *host = mmc_priv(mmc);
 371         struct mmc_data *data = mrq->data;
 372
 373         if (host->use_dma && data->host_cookie) {
 374                 jz4740_mmc_dma_unmap(host, data);
 375                 data->host_cookie = 0;
 376         }
 377
 378         if (err) {
 379                 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 380
 381                 dmaengine_terminate_all(chan);
 382         }
 383 }
 384
 385 /*----------------------------------------------------------------------------*/
 386
 387 static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
 388         unsigned int irq, bool enabled)
 389 {
 390         unsigned long flags;
 391
 392         spin_lock_irqsave(&host->lock, flags);
 393         if (enabled)
 394                 host->irq_mask &= ~irq;
 395         else
 396                 host->irq_mask |= irq;
 397
 398         jz4740_mmc_write_irq_mask(host, host->irq_mask);
 399         spin_unlock_irqrestore(&host->lock, flags);
 400 }
 401
 402 static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
 403         bool start_transfer)
 404 {
 405         uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
 406
 407         if (start_transfer)
 408                 val |= JZ_MMC_STRPCL_START_OP;
 409
 410         writew(val, host->base + JZ_REG_MMC_STRPCL);
 411 }
 412
 413 static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
 414 {
 415         uint32_t status;
 416         unsigned int timeout = 1000;
 417
 418         writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
 419         do {
 420                 status = readl(host->base + JZ_REG_MMC_STATUS);
 421         } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
 422 }
 423
 424 static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
 425 {
 426         uint32_t status;
 427         unsigned int timeout = 1000;
 428
 429         writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
 430         udelay(10);
 431         do {
 432                 status = readl(host->base + JZ_REG_MMC_STATUS);
 433         } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
 434 }
 435
 436 static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
 437 {
 438         struct mmc_request *req;
 439
 440         req = host->req;
 441         host->req = NULL;
 442
 443         mmc_request_done(host->mmc, req);
 444 }
 445
 446 static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
 447         unsigned int irq)
 448 {
 449         unsigned int timeout = 0x800;
 450         uint32_t status;
 451
 452         do {
 453                 status = jz4740_mmc_read_irq_reg(host);
 454         } while (!(status & irq) && --timeout);
 455
 456         if (timeout == 0) {
 457                 set_bit(0, &host->waiting);
 458                 mod_timer(&host->timeout_timer, jiffies + 5*HZ);
 459                 jz4740_mmc_set_irq_enabled(host, irq, true);
 460                 return true;
 461         }
 462
 463         return false;
 464 }
 465
 466 static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
 467         struct mmc_data *data)
 468 {
 469         int status;
 470
 471         status = readl(host->base + JZ_REG_MMC_STATUS);
 472         if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
 473                 if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
 474                         host->req->cmd->error = -ETIMEDOUT;
 475                         data->error = -ETIMEDOUT;
 476                 } else {
 477                         host->req->cmd->error = -EIO;
 478                         data->error = -EIO;
 479                 }
 480         } else if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
 481                 if (status & (JZ_MMC_STATUS_TIMEOUT_READ)) {
 482                         host->req->cmd->error = -ETIMEDOUT;
 483                         data->error = -ETIMEDOUT;
 484                 } else {
 485                         host->req->cmd->error = -EIO;
 486                         data->error = -EIO;
 487                 }
 488         }
 489 }
 490
 491 static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
 492         struct mmc_data *data)
 493 {
 494         struct sg_mapping_iter *miter = &host->miter;
 495         void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
 496         uint32_t *buf;
 497         bool timeout;
 498         size_t i, j;
 499
 500         while (sg_miter_next(miter)) {
 501                 buf = miter->addr;
 502                 i = miter->length / 4;
 503                 j = i / 8;
 504                 i = i & 0x7;
 505                 while (j) {
 506                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
 507                         if (unlikely(timeout))
 508                                 goto poll_timeout;
 509
 510                         writel(buf[0], fifo_addr);
 511                         writel(buf[1], fifo_addr);
 512                         writel(buf[2], fifo_addr);
 513                         writel(buf[3], fifo_addr);
 514                         writel(buf[4], fifo_addr);
 515                         writel(buf[5], fifo_addr);
 516                         writel(buf[6], fifo_addr);
 517                         writel(buf[7], fifo_addr);
 518                         buf += 8;
 519                         --j;
 520                 }
 521                 if (unlikely(i)) {
 522                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
 523                         if (unlikely(timeout))
 524                                 goto poll_timeout;
 525
 526                         while (i) {
 527                                 writel(*buf, fifo_addr);
 528                                 ++buf;
 529                                 --i;
 530                         }
 531                 }
 532                 data->bytes_xfered += miter->length;
 533         }
 534         sg_miter_stop(miter);
 535
 536         return false;
 537
 538 poll_timeout:
 539         miter->consumed = (void *)buf - miter->addr;
 540         data->bytes_xfered += miter->consumed;
 541         sg_miter_stop(miter);
 542
 543         return true;
 544 }
 545
 546 static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
 547                                 struct mmc_data *data)
 548 {
 549         struct sg_mapping_iter *miter = &host->miter;
 550         void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
 551         uint32_t *buf;
 552         uint32_t d;
 553         uint32_t status;
 554         size_t i, j;
 555         unsigned int timeout;
 556
 557         while (sg_miter_next(miter)) {
 558                 buf = miter->addr;
 559                 i = miter->length;
 560                 j = i / 32;
 561                 i = i & 0x1f;
 562                 while (j) {
 563                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
 564                         if (unlikely(timeout))
 565                                 goto poll_timeout;
 566
 567                         buf[0] = readl(fifo_addr);
 568                         buf[1] = readl(fifo_addr);
 569                         buf[2] = readl(fifo_addr);
 570                         buf[3] = readl(fifo_addr);
 571                         buf[4] = readl(fifo_addr);
 572                         buf[5] = readl(fifo_addr);
 573                         buf[6] = readl(fifo_addr);
 574                         buf[7] = readl(fifo_addr);
 575
 576                         buf += 8;
 577                         --j;
 578                 }
 579
 580                 if (unlikely(i)) {
 581                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
 582                         if (unlikely(timeout))
 583                                 goto poll_timeout;
 584
 585                         while (i >= 4) {
 586                                 *buf++ = readl(fifo_addr);
 587                                 i -= 4;
 588                         }
 589                         if (unlikely(i > 0)) {
 590                                 d = readl(fifo_addr);
 591                                 memcpy(buf, &d, i);
 592                         }
 593                 }
 594                 data->bytes_xfered += miter->length;
 595
 596                 /* This can go away once MIPS implements
 597                  * flush_kernel_dcache_page */
 598                 flush_dcache_page(miter->page);
 599         }
 600         sg_miter_stop(miter);
 601
 602         /* For whatever reason there is sometime one word more in the fifo then
 603          * requested */
 604         timeout = 1000;
 605         status = readl(host->base + JZ_REG_MMC_STATUS);
 606         while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
 607                 d = readl(fifo_addr);
 608                 status = readl(host->base + JZ_REG_MMC_STATUS);
 609         }
 610
 611         return false;
 612
 613 poll_timeout:
 614         miter->consumed = (void *)buf - miter->addr;
 615         data->bytes_xfered += miter->consumed;
 616         sg_miter_stop(miter);
 617
 618         return true;
 619 }
 620
 621 static void jz4740_mmc_timeout(struct timer_list *t)
 622 {
 623         struct jz4740_mmc_host *host = from_timer(host, t, timeout_timer);
 624
 625         if (!test_and_clear_bit(0, &host->waiting))
 626                 return;
 627
 628         jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
 629
 630         host->req->cmd->error = -ETIMEDOUT;
 631         jz4740_mmc_request_done(host);
 632 }
 633
 634 static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
 635         struct mmc_command *cmd)
 636 {
 637         int i;
 638         uint16_t tmp;
 639         void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
 640
 641         if (cmd->flags & MMC_RSP_136) {
 642                 tmp = readw(fifo_addr);
 643                 for (i = 0; i < 4; ++i) {
 644                         cmd->resp[i] = tmp << 24;
 645                         tmp = readw(fifo_addr);
 646                         cmd->resp[i] |= tmp << 8;
 647                         tmp = readw(fifo_addr);
 648                         cmd->resp[i] |= tmp >> 8;
 649                 }
 650         } else {
 651                 cmd->resp[0] = readw(fifo_addr) << 24;
 652                 cmd->resp[0] |= readw(fifo_addr) << 8;
 653                 cmd->resp[0] |= readw(fifo_addr) & 0xff;
 654         }
 655 }
 656
 657 static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
 658         struct mmc_command *cmd)
 659 {
 660         uint32_t cmdat = host->cmdat;
 661
 662         host->cmdat &= ~JZ_MMC_CMDAT_INIT;
 663         jz4740_mmc_clock_disable(host);
 664
 665         host->cmd = cmd;
 666
 667         if (cmd->flags & MMC_RSP_BUSY)
 668                 cmdat |= JZ_MMC_CMDAT_BUSY;
 669
 670         switch (mmc_resp_type(cmd)) {
 671         case MMC_RSP_R1B:
 672         case MMC_RSP_R1:
 673                 cmdat |= JZ_MMC_CMDAT_RSP_R1;
 674                 break;
 675         case MMC_RSP_R2:
 676                 cmdat |= JZ_MMC_CMDAT_RSP_R2;
 677                 break;
 678         case MMC_RSP_R3:
 679                 cmdat |= JZ_MMC_CMDAT_RSP_R3;
 680                 break;
 681         default:
 682                 break;
 683         }
 684
 685         if (cmd->data) {
 686                 cmdat |= JZ_MMC_CMDAT_DATA_EN;
 687                 if (cmd->data->flags & MMC_DATA_WRITE)
 688                         cmdat |= JZ_MMC_CMDAT_WRITE;
 689                 if (host->use_dma) {
 690                         /*
 691                          * The 4780's MMC controller has integrated DMA ability
 692                          * in addition to being able to use the external DMA
 693                          * controller. It moves DMA control bits to a separate
 694                          * register. The DMA_SEL bit chooses the external
 695                          * controller over the integrated one. Earlier SoCs
 696                          * can only use the external controller, and have a
 697                          * single DMA enable bit in CMDAT.
 698                          */
 699                         if (host->version >= JZ_MMC_JZ4780) {
 700                                 writel(JZ_MMC_DMAC_DMA_EN | JZ_MMC_DMAC_DMA_SEL,
 701                                        host->base + JZ_REG_MMC_DMAC);
 702                         } else {
 703                                 cmdat |= JZ_MMC_CMDAT_DMA_EN;
 704                         }
 705                 } else if (host->version >= JZ_MMC_JZ4780) {
 706                         writel(0, host->base + JZ_REG_MMC_DMAC);
 707                 }
 708
 709                 writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
 710                 writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
 711         }
 712
 713         writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
 714         writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
 715         writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
 716
 717         jz4740_mmc_clock_enable(host, 1);
 718 }
 719
 720 static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
 721 {
 722         struct mmc_command *cmd = host->req->cmd;
 723         struct mmc_data *data = cmd->data;
 724         int direction;
 725
 726         if (data->flags & MMC_DATA_READ)
 727                 direction = SG_MITER_TO_SG;
 728         else
 729                 direction = SG_MITER_FROM_SG;
 730
 731         sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
 732 }
 733
 734
 735 static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
 736 {
 737         struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
 738         struct mmc_command *cmd = host->req->cmd;
 739         struct mmc_request *req = host->req;
 740         struct mmc_data *data = cmd->data;
 741         bool timeout = false;
 742
 743         if (cmd->error)
 744                 host->state = JZ4740_MMC_STATE_DONE;
 745
 746         switch (host->state) {
 747         case JZ4740_MMC_STATE_READ_RESPONSE:
 748                 if (cmd->flags & MMC_RSP_PRESENT)
 749                         jz4740_mmc_read_response(host, cmd);
 750
 751                 if (!data)
 752                         break;
 753
 754                 jz_mmc_prepare_data_transfer(host);
 755
 756         case JZ4740_MMC_STATE_TRANSFER_DATA:
 757                 if (host->use_dma) {
 758                         /* Use DMA if enabled.
 759                          * Data transfer direction is defined later by
 760                          * relying on data flags in
 761                          * jz4740_mmc_prepare_dma_data() and
 762                          * jz4740_mmc_start_dma_transfer().
 763                          */
 764                         timeout = jz4740_mmc_start_dma_transfer(host, data);
 765                         data->bytes_xfered = data->blocks * data->blksz;
 766                 } else if (data->flags & MMC_DATA_READ)
 767                         /* Use PIO if DMA is not enabled.
 768                          * Data transfer direction was defined before
 769                          * by relying on data flags in
 770                          * jz_mmc_prepare_data_transfer().
 771                          */
 772                         timeout = jz4740_mmc_read_data(host, data);
 773                 else
 774                         timeout = jz4740_mmc_write_data(host, data);
 775
 776                 if (unlikely(timeout)) {
 777                         host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
 778                         break;
 779                 }
 780
 781                 jz4740_mmc_transfer_check_state(host, data);
 782
 783                 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
 784                 if (unlikely(timeout)) {
 785                         host->state = JZ4740_MMC_STATE_SEND_STOP;
 786                         break;
 787                 }
 788                 jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
 789
 790         case JZ4740_MMC_STATE_SEND_STOP:
 791                 if (!req->stop)
 792                         break;
 793
 794                 jz4740_mmc_send_command(host, req->stop);
 795
 796                 if (mmc_resp_type(req->stop) & MMC_RSP_BUSY) {
 797                         timeout = jz4740_mmc_poll_irq(host,
 798                                                       JZ_MMC_IRQ_PRG_DONE);
 799                         if (timeout) {
 800                                 host->state = JZ4740_MMC_STATE_DONE;
 801                                 break;
 802                         }
 803                 }
 804         case JZ4740_MMC_STATE_DONE:
 805                 break;
 806         }
 807
 808         if (!timeout)
 809                 jz4740_mmc_request_done(host);
 810
 811         return IRQ_HANDLED;
 812 }
 813
 814 static irqreturn_t jz_mmc_irq(int irq, void *devid)
 815 {
 816         struct jz4740_mmc_host *host = devid;
 817         struct mmc_command *cmd = host->cmd;
 818         uint32_t irq_reg, status, tmp;
 819
 820         status = readl(host->base + JZ_REG_MMC_STATUS);
 821         irq_reg = jz4740_mmc_read_irq_reg(host);
 822
 823         tmp = irq_reg;
 824         irq_reg &= ~host->irq_mask;
 825
 826         tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
 827                 JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
 828
 829         if (tmp != irq_reg)
 830                 jz4740_mmc_write_irq_reg(host, tmp & ~irq_reg);
 831
 832         if (irq_reg & JZ_MMC_IRQ_SDIO) {
 833                 jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_SDIO);
 834                 mmc_signal_sdio_irq(host->mmc);
 835                 irq_reg &= ~JZ_MMC_IRQ_SDIO;
 836         }
 837
 838         if (host->req && cmd && irq_reg) {
 839                 if (test_and_clear_bit(0, &host->waiting)) {
 840                         del_timer(&host->timeout_timer);
 841
 842                         if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
 843                                         cmd->error = -ETIMEDOUT;
 844                         } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
 845                                         cmd->error = -EIO;
 846                         } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
 847                                     JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
 848                                         if (cmd->data)
 849                                                         cmd->data->error = -EIO;
 850                                         cmd->error = -EIO;
 851                         }
 852
 853                         jz4740_mmc_set_irq_enabled(host, irq_reg, false);
 854                         jz4740_mmc_write_irq_reg(host, irq_reg);
 855
 856                         return IRQ_WAKE_THREAD;
 857                 }
 858         }
 859
 860         return IRQ_HANDLED;
 861 }
 862
 863 static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
 864 {
 865         int div = 0;
 866         int real_rate;
 867
 868         jz4740_mmc_clock_disable(host);
 869         clk_set_rate(host->clk, host->mmc->f_max);
 870
 871         real_rate = clk_get_rate(host->clk);
 872
 873         while (real_rate > rate && div < 7) {
 874                 ++div;
 875                 real_rate >>= 1;
 876         }
 877
 878         writew(div, host->base + JZ_REG_MMC_CLKRT);
 879         return real_rate;
 880 }
 881
 882 static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
 883 {
 884         struct jz4740_mmc_host *host = mmc_priv(mmc);
 885
 886         host->req = req;
 887
 888         jz4740_mmc_write_irq_reg(host, ~0);
 889         jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
 890
 891         host->state = JZ4740_MMC_STATE_READ_RESPONSE;
 892         set_bit(0, &host->waiting);
 893         mod_timer(&host->timeout_timer, jiffies + 5*HZ);
 894         jz4740_mmc_send_command(host, req->cmd);
 895 }
 896
 897 static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 898 {
 899         struct jz4740_mmc_host *host = mmc_priv(mmc);
 900         if (ios->clock)
 901                 jz4740_mmc_set_clock_rate(host, ios->clock);
 902
 903         switch (ios->power_mode) {
 904         case MMC_POWER_UP:
 905                 jz4740_mmc_reset(host);
 906                 if (host->pdata && gpio_is_valid(host->pdata->gpio_power))
 907                         gpio_set_value(host->pdata->gpio_power,
 908                                         !host->pdata->power_active_low);
 909                 host->cmdat |= JZ_MMC_CMDAT_INIT;
 910                 clk_prepare_enable(host->clk);
 911                 break;
 912         case MMC_POWER_ON:
 913                 break;
 914         default:
 915                 if (host->pdata && gpio_is_valid(host->pdata->gpio_power))
 916                         gpio_set_value(host->pdata->gpio_power,
 917                                         host->pdata->power_active_low);
 918                 clk_disable_unprepare(host->clk);
 919                 break;
 920         }
 921
 922         switch (ios->bus_width) {
 923         case MMC_BUS_WIDTH_1:
 924                 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
 925                 break;
 926         case MMC_BUS_WIDTH_4:
 927                 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
 928                 break;
 929         default:
 930                 break;
 931         }
 932 }
 933
 934 static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 935 {
 936         struct jz4740_mmc_host *host = mmc_priv(mmc);
 937         jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
 938 }
 939
 940 static const struct mmc_host_ops jz4740_mmc_ops = {
 941         .request        = jz4740_mmc_request,
 942         .pre_req        = jz4740_mmc_pre_request,
 943         .post_req       = jz4740_mmc_post_request,
 944         .set_ios        = jz4740_mmc_set_ios,
 945         .get_ro         = mmc_gpio_get_ro,
 946         .get_cd         = mmc_gpio_get_cd,
 947         .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
 948 };
 949
 950 static int jz4740_mmc_request_gpio(struct device *dev, int gpio,
 951         const char *name, bool output, int value)
 952 {
 953         int ret;
 954
 955         if (!gpio_is_valid(gpio))
 956                 return 0;
 957
 958         ret = gpio_request(gpio, name);
 959         if (ret) {
 960                 dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
 961                 return ret;
 962         }
 963
 964         if (output)
 965                 gpio_direction_output(gpio, value);
 966         else
 967                 gpio_direction_input(gpio);
 968
 969         return 0;
 970 }
 971
 972 static int jz4740_mmc_request_gpios(struct mmc_host *mmc,
 973         struct platform_device *pdev)
 974 {
 975         struct jz4740_mmc_platform_data *pdata = dev_get_platdata(&pdev->dev);
 976         int ret = 0;
 977
 978         if (!pdata)
 979                 return 0;
 980
 981         if (!pdata->card_detect_active_low)
 982                 mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
 983         if (!pdata->read_only_active_low)
 984                 mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
 985
 986         /*
 987          * Get optional card detect and write protect GPIOs,
 988          * only back out on probe deferral.
 989          */
 990         ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
 991         if (ret == -EPROBE_DEFER)
 992                 return ret;
 993
 994         ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL);
 995         if (ret == -EPROBE_DEFER)
 996                 return ret;
 997
 998         return jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
 999                         "MMC read only", true, pdata->power_active_low);
1000 }
1001
1002 static void jz4740_mmc_free_gpios(struct platform_device *pdev)
1003 {
1004         struct jz4740_mmc_platform_data *pdata = dev_get_platdata(&pdev->dev);
1005
1006         if (!pdata)
1007                 return;
1008
1009         if (gpio_is_valid(pdata->gpio_power))
1010                 gpio_free(pdata->gpio_power);
1011 }
1012
1013 static const struct of_device_id jz4740_mmc_of_match[] = {
1014         { .compatible = "ingenic,jz4740-mmc", .data = (void *) JZ_MMC_JZ4740 },
1015         { .compatible = "ingenic,jz4780-mmc", .data = (void *) JZ_MMC_JZ4780 },
1016         {},
1017 };
1018 MODULE_DEVICE_TABLE(of, jz4740_mmc_of_match);
1019
1020 static int jz4740_mmc_probe(struct platform_device* pdev)
1021 {
1022         int ret;
1023         struct mmc_host *mmc;
1024         struct jz4740_mmc_host *host;
1025         const struct of_device_id *match;
1026         struct jz4740_mmc_platform_data *pdata;
1027
1028         pdata = dev_get_platdata(&pdev->dev);
1029
1030         mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
1031         if (!mmc) {
1032                 dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
1033                 return -ENOMEM;
1034         }
1035
1036         host = mmc_priv(mmc);
1037         host->pdata = pdata;
1038
1039         match = of_match_device(jz4740_mmc_of_match, &pdev->dev);
1040         if (match) {
1041                 host->version = (enum jz4740_mmc_version)match->data;
1042                 ret = mmc_of_parse(mmc);
1043                 if (ret) {
1044                         if (ret != -EPROBE_DEFER)
1045                                 dev_err(&pdev->dev,
1046                                         "could not parse of data: %d\n", ret);
1047                         goto err_free_host;
1048                 }
1049         } else {
1050                 /* JZ4740 should be the only one using legacy probe */
1051                 host->version = JZ_MMC_JZ4740;
1052                 mmc->caps |= MMC_CAP_SDIO_IRQ;
1053                 if (!(pdata && pdata->data_1bit))
1054                         mmc->caps |= MMC_CAP_4_BIT_DATA;
1055                 ret = jz4740_mmc_request_gpios(mmc, pdev);
1056                 if (ret)
1057                         goto err_free_host;
1058         }
1059
1060         host->irq = platform_get_irq(pdev, 0);
1061         if (host->irq < 0) {
1062                 ret = host->irq;
1063                 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
1064                 goto err_free_host;
1065         }
1066
1067         host->clk = devm_clk_get(&pdev->dev, "mmc");
1068         if (IS_ERR(host->clk)) {
1069                 ret = PTR_ERR(host->clk);
1070                 dev_err(&pdev->dev, "Failed to get mmc clock\n");
1071                 goto err_free_host;
1072         }
1073
1074         host->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1075         host->base = devm_ioremap_resource(&pdev->dev, host->mem_res);
1076         if (IS_ERR(host->base)) {
1077                 ret = PTR_ERR(host->base);
1078                 dev_err(&pdev->dev, "Failed to ioremap base memory\n");
1079                 goto err_free_host;
1080         }
1081
1082         mmc->ops = &jz4740_mmc_ops;
1083         if (!mmc->f_max)
1084                 mmc->f_max = JZ_MMC_CLK_RATE;
1085         mmc->f_min = mmc->f_max / 128;
1086         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1087
1088         mmc->max_blk_size = (1 << 10) - 1;
1089         mmc->max_blk_count = (1 << 15) - 1;
1090         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1091
1092         mmc->max_segs = 128;
1093         mmc->max_seg_size = mmc->max_req_size;
1094
1095         host->mmc = mmc;
1096         host->pdev = pdev;
1097         spin_lock_init(&host->lock);
1098         host->irq_mask = ~0;
1099
1100         jz4740_mmc_reset(host);
1101
1102         ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
1103                         dev_name(&pdev->dev), host);
1104         if (ret) {
1105                 dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
1106                 goto err_free_gpios;
1107         }
1108
1109         jz4740_mmc_clock_disable(host);
1110         timer_setup(&host->timeout_timer, jz4740_mmc_timeout, 0);
1111
1112         ret = jz4740_mmc_acquire_dma_channels(host);
1113         if (ret == -EPROBE_DEFER)
1114                 goto err_free_irq;
1115         host->use_dma = !ret;
1116
1117         platform_set_drvdata(pdev, host);
1118         ret = mmc_add_host(mmc);
1119
1120         if (ret) {
1121                 dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
1122                 goto err_release_dma;
1123         }
1124         dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
1125
1126         dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
1127                  host->use_dma ? "DMA" : "PIO",
1128                  (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
1129
1130         return 0;
1131
1132 err_release_dma:
1133         if (host->use_dma)
1134                 jz4740_mmc_release_dma_channels(host);
1135 err_free_irq:
1136         free_irq(host->irq, host);
1137 err_free_gpios:
1138         jz4740_mmc_free_gpios(pdev);
1139 err_free_host:
1140         mmc_free_host(mmc);
1141
1142         return ret;
1143 }
1144
1145 static int jz4740_mmc_remove(struct platform_device *pdev)
1146 {
1147         struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
1148
1149         del_timer_sync(&host->timeout_timer);
1150         jz4740_mmc_set_irq_enabled(host, 0xff, false);
1151         jz4740_mmc_reset(host);
1152
1153         mmc_remove_host(host->mmc);
1154
1155         free_irq(host->irq, host);
1156
1157         jz4740_mmc_free_gpios(pdev);
1158
1159         if (host->use_dma)
1160                 jz4740_mmc_release_dma_channels(host);
1161
1162         mmc_free_host(host->mmc);
1163
1164         return 0;
1165 }
1166
1167 #ifdef CONFIG_PM_SLEEP
1168
1169 static int jz4740_mmc_suspend(struct device *dev)
1170 {
1171         return pinctrl_pm_select_sleep_state(dev);
1172 }
1173
1174 static int jz4740_mmc_resume(struct device *dev)
1175 {
1176         return pinctrl_pm_select_default_state(dev);
1177 }
1178
1179 static SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
1180         jz4740_mmc_resume);
1181 #define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
1182 #else
1183 #define JZ4740_MMC_PM_OPS NULL
1184 #endif
1185
1186 static struct platform_driver jz4740_mmc_driver = {
1187         .probe = jz4740_mmc_probe,
1188         .remove = jz4740_mmc_remove,
1189         .driver = {
1190                 .name = "jz4740-mmc",
1191                 .of_match_table = of_match_ptr(jz4740_mmc_of_match),
1192                 .pm = JZ4740_MMC_PM_OPS,
1193         },
1194 };
1195
1196 module_platform_driver(jz4740_mmc_driver);
1197
1198 MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
1199 MODULE_LICENSE("GPL");
1200 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");