drivers/mmc/host/jz4740_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2009-2010, Lars-Peter Clausen <[email protected]>
   4  *  Copyright (C) 2013, Imagination Technologies
   5  *
   6  *  JZ4740 SD/MMC controller driver
   7  */
   8
   9 #include <linux/bitops.h>
  10 #include <linux/clk.h>
  11 #include <linux/delay.h>
  12 #include <linux/dmaengine.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/err.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/irq.h>
  18 #include <linux/mmc/host.h>
  19 #include <linux/mmc/slot-gpio.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/property.h>
  25 #include <linux/regulator/consumer.h>
  26 #include <linux/scatterlist.h>
  27
  28 #include <asm/cacheflush.h>
  29
  30 #define JZ_REG_MMC_STRPCL       0x00
  31 #define JZ_REG_MMC_STATUS       0x04
  32 #define JZ_REG_MMC_CLKRT        0x08
  33 #define JZ_REG_MMC_CMDAT        0x0C
  34 #define JZ_REG_MMC_RESTO        0x10
  35 #define JZ_REG_MMC_RDTO         0x14
  36 #define JZ_REG_MMC_BLKLEN       0x18
  37 #define JZ_REG_MMC_NOB          0x1C
  38 #define JZ_REG_MMC_SNOB         0x20
  39 #define JZ_REG_MMC_IMASK        0x24
  40 #define JZ_REG_MMC_IREG         0x28
  41 #define JZ_REG_MMC_CMD          0x2C
  42 #define JZ_REG_MMC_ARG          0x30
  43 #define JZ_REG_MMC_RESP_FIFO    0x34
  44 #define JZ_REG_MMC_RXFIFO       0x38
  45 #define JZ_REG_MMC_TXFIFO       0x3C
  46 #define JZ_REG_MMC_LPM          0x40
  47 #define JZ_REG_MMC_DMAC         0x44
  48
  49 #define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
  50 #define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
  51 #define JZ_MMC_STRPCL_START_READWAIT BIT(5)
  52 #define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
  53 #define JZ_MMC_STRPCL_RESET BIT(3)
  54 #define JZ_MMC_STRPCL_START_OP BIT(2)
  55 #define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
  56 #define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
  57 #define JZ_MMC_STRPCL_CLOCK_START BIT(1)
  58
  59
  60 #define JZ_MMC_STATUS_IS_RESETTING BIT(15)
  61 #define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
  62 #define JZ_MMC_STATUS_PRG_DONE BIT(13)
  63 #define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
  64 #define JZ_MMC_STATUS_END_CMD_RES BIT(11)
  65 #define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
  66 #define JZ_MMC_STATUS_IS_READWAIT BIT(9)
  67 #define JZ_MMC_STATUS_CLK_EN BIT(8)
  68 #define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
  69 #define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
  70 #define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
  71 #define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
  72 #define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
  73 #define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
  74 #define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
  75 #define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
  76
  77 #define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
  78 #define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
  79
  80
  81 #define JZ_MMC_CMDAT_IO_ABORT BIT(11)
  82 #define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
  83 #define JZ_MMC_CMDAT_BUS_WIDTH_8BIT (BIT(10) | BIT(9))
  84 #define JZ_MMC_CMDAT_BUS_WIDTH_MASK (BIT(10) | BIT(9))
  85 #define JZ_MMC_CMDAT_DMA_EN BIT(8)
  86 #define JZ_MMC_CMDAT_INIT BIT(7)
  87 #define JZ_MMC_CMDAT_BUSY BIT(6)
  88 #define JZ_MMC_CMDAT_STREAM BIT(5)
  89 #define JZ_MMC_CMDAT_WRITE BIT(4)
  90 #define JZ_MMC_CMDAT_DATA_EN BIT(3)
  91 #define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
  92 #define JZ_MMC_CMDAT_RSP_R1 1
  93 #define JZ_MMC_CMDAT_RSP_R2 2
  94 #define JZ_MMC_CMDAT_RSP_R3 3
  95
  96 #define JZ_MMC_IRQ_SDIO BIT(7)
  97 #define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
  98 #define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
  99 #define JZ_MMC_IRQ_END_CMD_RES BIT(2)
 100 #define JZ_MMC_IRQ_PRG_DONE BIT(1)
 101 #define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
 102
 103 #define JZ_MMC_DMAC_DMA_SEL BIT(1)
 104 #define JZ_MMC_DMAC_DMA_EN BIT(0)
 105
 106 #define JZ_MMC_LPM_DRV_RISING BIT(31)
 107 #define JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY BIT(31)
 108 #define JZ_MMC_LPM_DRV_RISING_1NS_DLY BIT(30)
 109 #define JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY BIT(29)
 110 #define JZ_MMC_LPM_LOW_POWER_MODE_EN BIT(0)
 111
 112 #define JZ_MMC_CLK_RATE 24000000
 113 #define JZ_MMC_REQ_TIMEOUT_MS 5000
 114
 115 enum jz4740_mmc_version {
 116         JZ_MMC_JZ4740,
 117         JZ_MMC_JZ4725B,
 118         JZ_MMC_JZ4760,
 119         JZ_MMC_JZ4780,
 120         JZ_MMC_X1000,
 121 };
 122
 123 enum jz4740_mmc_state {
 124         JZ4740_MMC_STATE_READ_RESPONSE,
 125         JZ4740_MMC_STATE_TRANSFER_DATA,
 126         JZ4740_MMC_STATE_SEND_STOP,
 127         JZ4740_MMC_STATE_DONE,
 128 };
 129
 130 /*
 131  * The MMC core allows to prepare a mmc_request while another mmc_request
 132  * is in-flight. This is used via the pre_req/post_req hooks.
 133  * This driver uses the pre_req/post_req hooks to map/unmap the mmc_request.
 134  * Following what other drivers do (sdhci, dw_mmc) we use the following cookie
 135  * flags to keep track of the mmc_request mapping state.
 136  *
 137  * COOKIE_UNMAPPED: the request is not mapped.
 138  * COOKIE_PREMAPPED: the request was mapped in pre_req,
 139  * and should be unmapped in post_req.
 140  * COOKIE_MAPPED: the request was mapped in the irq handler,
 141  * and should be unmapped before mmc_request_done is called..
 142  */
 143 enum jz4780_cookie {
 144         COOKIE_UNMAPPED = 0,
 145         COOKIE_PREMAPPED,
 146         COOKIE_MAPPED,
 147 };
 148
 149 struct jz4740_mmc_host {
 150         struct mmc_host *mmc;
 151         struct platform_device *pdev;
 152         struct clk *clk;
 153
 154         enum jz4740_mmc_version version;
 155
 156         int irq;
 157
 158         void __iomem *base;
 159         struct resource *mem_res;
 160         struct mmc_request *req;
 161         struct mmc_command *cmd;
 162
 163         bool vqmmc_enabled;
 164
 165         unsigned long waiting;
 166
 167         uint32_t cmdat;
 168
 169         uint32_t irq_mask;
 170
 171         spinlock_t lock;
 172
 173         struct timer_list timeout_timer;
 174         struct sg_mapping_iter miter;
 175         enum jz4740_mmc_state state;
 176
 177         /* DMA support */
 178         struct dma_chan *dma_rx;
 179         struct dma_chan *dma_tx;
 180         bool use_dma;
 181
 182 /* The DMA trigger level is 8 words, that is to say, the DMA read
 183  * trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
 184  * trigger is when data words in MSC_TXFIFO is < 8.
 185  */
 186 #define JZ4740_MMC_FIFO_HALF_SIZE 8
 187 };
 188
 189 static void jz4740_mmc_write_irq_mask(struct jz4740_mmc_host *host,
 190                                       uint32_t val)
 191 {
 192         if (host->version >= JZ_MMC_JZ4725B)
 193                 return writel(val, host->base + JZ_REG_MMC_IMASK);
 194         else
 195                 return writew(val, host->base + JZ_REG_MMC_IMASK);
 196 }
 197
 198 static void jz4740_mmc_write_irq_reg(struct jz4740_mmc_host *host,
 199                                      uint32_t val)
 200 {
 201         if (host->version >= JZ_MMC_JZ4780)
 202                 writel(val, host->base + JZ_REG_MMC_IREG);
 203         else
 204                 writew(val, host->base + JZ_REG_MMC_IREG);
 205 }
 206
 207 static uint32_t jz4740_mmc_read_irq_reg(struct jz4740_mmc_host *host)
 208 {
 209         if (host->version >= JZ_MMC_JZ4780)
 210                 return readl(host->base + JZ_REG_MMC_IREG);
 211         else
 212                 return readw(host->base + JZ_REG_MMC_IREG);
 213 }
 214
 215 /*----------------------------------------------------------------------------*/
 216 /* DMA infrastructure */
 217
 218 static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host)
 219 {
 220         if (!host->use_dma)
 221                 return;
 222
 223         dma_release_channel(host->dma_tx);
 224         if (host->dma_rx)
 225                 dma_release_channel(host->dma_rx);
 226 }
 227
 228 static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host)
 229 {
 230         struct device *dev = mmc_dev(host->mmc);
 231
 232         host->dma_tx = dma_request_chan(dev, "tx-rx");
 233         if (!IS_ERR(host->dma_tx))
 234                 return 0;
 235
 236         if (PTR_ERR(host->dma_tx) != -ENODEV) {
 237                 dev_err(dev, "Failed to get dma tx-rx channel\n");
 238                 return PTR_ERR(host->dma_tx);
 239         }
 240
 241         host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
 242         if (IS_ERR(host->dma_tx)) {
 243                 dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
 244                 return PTR_ERR(host->dma_tx);
 245         }
 246
 247         host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
 248         if (IS_ERR(host->dma_rx)) {
 249                 dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
 250                 dma_release_channel(host->dma_tx);
 251                 return PTR_ERR(host->dma_rx);
 252         }
 253
 254         /*
 255          * Limit the maximum segment size in any SG entry according to
 256          * the parameters of the DMA engine device.
 257          */
 258         if (host->dma_tx) {
 259                 struct device *dev = host->dma_tx->device->dev;
 260                 unsigned int max_seg_size = dma_get_max_seg_size(dev);
 261
 262                 if (max_seg_size < host->mmc->max_seg_size)
 263                         host->mmc->max_seg_size = max_seg_size;
 264         }
 265
 266         if (host->dma_rx) {
 267                 struct device *dev = host->dma_rx->device->dev;
 268                 unsigned int max_seg_size = dma_get_max_seg_size(dev);
 269
 270                 if (max_seg_size < host->mmc->max_seg_size)
 271                         host->mmc->max_seg_size = max_seg_size;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host,
 278                                                        struct mmc_data *data)
 279 {
 280         if ((data->flags & MMC_DATA_READ) && host->dma_rx)
 281                 return host->dma_rx;
 282         else
 283                 return host->dma_tx;
 284 }
 285
 286 static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host,
 287                                  struct mmc_data *data)
 288 {
 289         struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 290         enum dma_data_direction dir = mmc_get_dma_dir(data);
 291
 292         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
 293         data->host_cookie = COOKIE_UNMAPPED;
 294 }
 295
 296 /* Prepares DMA data for current or next transfer.
 297  * A request can be in-flight when this is called.
 298  */
 299 static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
 300                                        struct mmc_data *data,
 301                                        int cookie)
 302 {
 303         struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 304         enum dma_data_direction dir = mmc_get_dma_dir(data);
 305         unsigned int sg_count;
 306
 307         if (data->host_cookie == COOKIE_PREMAPPED)
 308                 return data->sg_count;
 309
 310         sg_count = dma_map_sg(chan->device->dev,
 311                         data->sg,
 312                         data->sg_len,
 313                         dir);
 314
 315         if (!sg_count) {
 316                 dev_err(mmc_dev(host->mmc),
 317                         "Failed to map scatterlist for DMA operation\n");
 318                 return -EINVAL;
 319         }
 320
 321         data->sg_count = sg_count;
 322         data->host_cookie = cookie;
 323
 324         return data->sg_count;
 325 }
 326
 327 static int jz4740_mmc_start_dma_transfer(struct jz4740_mmc_host *host,
 328                                          struct mmc_data *data)
 329 {
 330         struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 331         struct dma_async_tx_descriptor *desc;
 332         struct dma_slave_config conf = {
 333                 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 334                 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
 335                 .src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
 336                 .dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
 337         };
 338         int sg_count;
 339
 340         if (data->flags & MMC_DATA_WRITE) {
 341                 conf.direction = DMA_MEM_TO_DEV;
 342                 conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
 343         } else {
 344                 conf.direction = DMA_DEV_TO_MEM;
 345                 conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
 346         }
 347
 348         sg_count = jz4740_mmc_prepare_dma_data(host, data, COOKIE_MAPPED);
 349         if (sg_count < 0)
 350                 return sg_count;
 351
 352         dmaengine_slave_config(chan, &conf);
 353         desc = dmaengine_prep_slave_sg(chan, data->sg, sg_count,
 354                         conf.direction,
 355                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 356         if (!desc) {
 357                 dev_err(mmc_dev(host->mmc),
 358                         "Failed to allocate DMA %s descriptor",
 359                          conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
 360                 goto dma_unmap;
 361         }
 362
 363         dmaengine_submit(desc);
 364         dma_async_issue_pending(chan);
 365
 366         return 0;
 367
 368 dma_unmap:
 369         if (data->host_cookie == COOKIE_MAPPED)
 370                 jz4740_mmc_dma_unmap(host, data);
 371         return -ENOMEM;
 372 }
 373
 374 static void jz4740_mmc_pre_request(struct mmc_host *mmc,
 375                                    struct mmc_request *mrq)
 376 {
 377         struct jz4740_mmc_host *host = mmc_priv(mmc);
 378         struct mmc_data *data = mrq->data;
 379
 380         if (!host->use_dma)
 381                 return;
 382
 383         data->host_cookie = COOKIE_UNMAPPED;
 384         if (jz4740_mmc_prepare_dma_data(host, data, COOKIE_PREMAPPED) < 0)
 385                 data->host_cookie = COOKIE_UNMAPPED;
 386 }
 387
 388 static void jz4740_mmc_post_request(struct mmc_host *mmc,
 389                                     struct mmc_request *mrq,
 390                                     int err)
 391 {
 392         struct jz4740_mmc_host *host = mmc_priv(mmc);
 393         struct mmc_data *data = mrq->data;
 394
 395         if (data && data->host_cookie != COOKIE_UNMAPPED)
 396                 jz4740_mmc_dma_unmap(host, data);
 397
 398         if (err) {
 399                 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 400
 401                 dmaengine_terminate_all(chan);
 402         }
 403 }
 404
 405 /*----------------------------------------------------------------------------*/
 406
 407 static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
 408         unsigned int irq, bool enabled)
 409 {
 410         unsigned long flags;
 411
 412         spin_lock_irqsave(&host->lock, flags);
 413         if (enabled)
 414                 host->irq_mask &= ~irq;
 415         else
 416                 host->irq_mask |= irq;
 417
 418         jz4740_mmc_write_irq_mask(host, host->irq_mask);
 419         spin_unlock_irqrestore(&host->lock, flags);
 420 }
 421
 422 static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
 423         bool start_transfer)
 424 {
 425         uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
 426
 427         if (start_transfer)
 428                 val |= JZ_MMC_STRPCL_START_OP;
 429
 430         writew(val, host->base + JZ_REG_MMC_STRPCL);
 431 }
 432
 433 static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
 434 {
 435         uint32_t status;
 436         unsigned int timeout = 1000;
 437
 438         writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
 439         do {
 440                 status = readl(host->base + JZ_REG_MMC_STATUS);
 441         } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
 442 }
 443
 444 static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
 445 {
 446         uint32_t status;
 447         unsigned int timeout = 1000;
 448
 449         writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
 450         udelay(10);
 451         do {
 452                 status = readl(host->base + JZ_REG_MMC_STATUS);
 453         } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
 454 }
 455
 456 static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
 457 {
 458         struct mmc_request *req;
 459         struct mmc_data *data;
 460
 461         req = host->req;
 462         data = req->data;
 463         host->req = NULL;
 464
 465         if (data && data->host_cookie == COOKIE_MAPPED)
 466                 jz4740_mmc_dma_unmap(host, data);
 467         mmc_request_done(host->mmc, req);
 468 }
 469
 470 static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
 471         unsigned int irq)
 472 {
 473         unsigned int timeout = 0x800;
 474         uint32_t status;
 475
 476         do {
 477                 status = jz4740_mmc_read_irq_reg(host);
 478         } while (!(status & irq) && --timeout);
 479
 480         if (timeout == 0) {
 481                 set_bit(0, &host->waiting);
 482                 mod_timer(&host->timeout_timer,
 483                           jiffies + msecs_to_jiffies(JZ_MMC_REQ_TIMEOUT_MS));
 484                 jz4740_mmc_set_irq_enabled(host, irq, true);
 485                 return true;
 486         }
 487
 488         return false;
 489 }
 490
 491 static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
 492         struct mmc_data *data)
 493 {
 494         int status;
 495
 496         status = readl(host->base + JZ_REG_MMC_STATUS);
 497         if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
 498                 if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
 499                         host->req->cmd->error = -ETIMEDOUT;
 500                         data->error = -ETIMEDOUT;
 501                 } else {
 502                         host->req->cmd->error = -EIO;
 503                         data->error = -EIO;
 504                 }
 505         } else if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
 506                 if (status & (JZ_MMC_STATUS_TIMEOUT_READ)) {
 507                         host->req->cmd->error = -ETIMEDOUT;
 508                         data->error = -ETIMEDOUT;
 509                 } else {
 510                         host->req->cmd->error = -EIO;
 511                         data->error = -EIO;
 512                 }
 513         }
 514 }
 515
 516 static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
 517         struct mmc_data *data)
 518 {
 519         struct sg_mapping_iter *miter = &host->miter;
 520         void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
 521         uint32_t *buf;
 522         bool timeout;
 523         size_t i, j;
 524
 525         while (sg_miter_next(miter)) {
 526                 buf = miter->addr;
 527                 i = miter->length / 4;
 528                 j = i / 8;
 529                 i = i & 0x7;
 530                 while (j) {
 531                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
 532                         if (unlikely(timeout))
 533                                 goto poll_timeout;
 534
 535                         writel(buf[0], fifo_addr);
 536                         writel(buf[1], fifo_addr);
 537                         writel(buf[2], fifo_addr);
 538                         writel(buf[3], fifo_addr);
 539                         writel(buf[4], fifo_addr);
 540                         writel(buf[5], fifo_addr);
 541                         writel(buf[6], fifo_addr);
 542                         writel(buf[7], fifo_addr);
 543                         buf += 8;
 544                         --j;
 545                 }
 546                 if (unlikely(i)) {
 547                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
 548                         if (unlikely(timeout))
 549                                 goto poll_timeout;
 550
 551                         while (i) {
 552                                 writel(*buf, fifo_addr);
 553                                 ++buf;
 554                                 --i;
 555                         }
 556                 }
 557                 data->bytes_xfered += miter->length;
 558         }
 559         sg_miter_stop(miter);
 560
 561         return false;
 562
 563 poll_timeout:
 564         miter->consumed = (void *)buf - miter->addr;
 565         data->bytes_xfered += miter->consumed;
 566         sg_miter_stop(miter);
 567
 568         return true;
 569 }
 570
 571 static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
 572                                 struct mmc_data *data)
 573 {
 574         struct sg_mapping_iter *miter = &host->miter;
 575         void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
 576         uint32_t *buf;
 577         uint32_t d;
 578         uint32_t status;
 579         size_t i, j;
 580         unsigned int timeout;
 581
 582         while (sg_miter_next(miter)) {
 583                 buf = miter->addr;
 584                 i = miter->length;
 585                 j = i / 32;
 586                 i = i & 0x1f;
 587                 while (j) {
 588                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
 589                         if (unlikely(timeout))
 590                                 goto poll_timeout;
 591
 592                         buf[0] = readl(fifo_addr);
 593                         buf[1] = readl(fifo_addr);
 594                         buf[2] = readl(fifo_addr);
 595                         buf[3] = readl(fifo_addr);
 596                         buf[4] = readl(fifo_addr);
 597                         buf[5] = readl(fifo_addr);
 598                         buf[6] = readl(fifo_addr);
 599                         buf[7] = readl(fifo_addr);
 600
 601                         buf += 8;
 602                         --j;
 603                 }
 604
 605                 if (unlikely(i)) {
 606                         timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
 607                         if (unlikely(timeout))
 608                                 goto poll_timeout;
 609
 610                         while (i >= 4) {
 611                                 *buf++ = readl(fifo_addr);
 612                                 i -= 4;
 613                         }
 614                         if (unlikely(i > 0)) {
 615                                 d = readl(fifo_addr);
 616                                 memcpy(buf, &d, i);
 617                         }
 618                 }
 619                 data->bytes_xfered += miter->length;
 620         }
 621         sg_miter_stop(miter);
 622
 623         /* For whatever reason there is sometime one word more in the fifo then
 624          * requested */
 625         timeout = 1000;
 626         status = readl(host->base + JZ_REG_MMC_STATUS);
 627         while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
 628                 d = readl(fifo_addr);
 629                 status = readl(host->base + JZ_REG_MMC_STATUS);
 630         }
 631
 632         return false;
 633
 634 poll_timeout:
 635         miter->consumed = (void *)buf - miter->addr;
 636         data->bytes_xfered += miter->consumed;
 637         sg_miter_stop(miter);
 638
 639         return true;
 640 }
 641
 642 static void jz4740_mmc_timeout(struct timer_list *t)
 643 {
 644         struct jz4740_mmc_host *host = from_timer(host, t, timeout_timer);
 645
 646         if (!test_and_clear_bit(0, &host->waiting))
 647                 return;
 648
 649         jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
 650
 651         host->req->cmd->error = -ETIMEDOUT;
 652         jz4740_mmc_request_done(host);
 653 }
 654
 655 static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
 656         struct mmc_command *cmd)
 657 {
 658         int i;
 659         uint16_t tmp;
 660         void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
 661
 662         if (cmd->flags & MMC_RSP_136) {
 663                 tmp = readw(fifo_addr);
 664                 for (i = 0; i < 4; ++i) {
 665                         cmd->resp[i] = tmp << 24;
 666                         tmp = readw(fifo_addr);
 667                         cmd->resp[i] |= tmp << 8;
 668                         tmp = readw(fifo_addr);
 669                         cmd->resp[i] |= tmp >> 8;
 670                 }
 671         } else {
 672                 cmd->resp[0] = readw(fifo_addr) << 24;
 673                 cmd->resp[0] |= readw(fifo_addr) << 8;
 674                 cmd->resp[0] |= readw(fifo_addr) & 0xff;
 675         }
 676 }
 677
 678 static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
 679         struct mmc_command *cmd)
 680 {
 681         uint32_t cmdat = host->cmdat;
 682
 683         host->cmdat &= ~JZ_MMC_CMDAT_INIT;
 684         jz4740_mmc_clock_disable(host);
 685
 686         host->cmd = cmd;
 687
 688         if (cmd->flags & MMC_RSP_BUSY)
 689                 cmdat |= JZ_MMC_CMDAT_BUSY;
 690
 691         switch (mmc_resp_type(cmd)) {
 692         case MMC_RSP_R1B:
 693         case MMC_RSP_R1:
 694                 cmdat |= JZ_MMC_CMDAT_RSP_R1;
 695                 break;
 696         case MMC_RSP_R2:
 697                 cmdat |= JZ_MMC_CMDAT_RSP_R2;
 698                 break;
 699         case MMC_RSP_R3:
 700                 cmdat |= JZ_MMC_CMDAT_RSP_R3;
 701                 break;
 702         default:
 703                 break;
 704         }
 705
 706         if (cmd->data) {
 707                 cmdat |= JZ_MMC_CMDAT_DATA_EN;
 708                 if (cmd->data->flags & MMC_DATA_WRITE)
 709                         cmdat |= JZ_MMC_CMDAT_WRITE;
 710                 if (host->use_dma) {
 711                         /*
 712                          * The JZ4780's MMC controller has integrated DMA ability
 713                          * in addition to being able to use the external DMA
 714                          * controller. It moves DMA control bits to a separate
 715                          * register. The DMA_SEL bit chooses the external
 716                          * controller over the integrated one. Earlier SoCs
 717                          * can only use the external controller, and have a
 718                          * single DMA enable bit in CMDAT.
 719                          */
 720                         if (host->version >= JZ_MMC_JZ4780) {
 721                                 writel(JZ_MMC_DMAC_DMA_EN | JZ_MMC_DMAC_DMA_SEL,
 722                                        host->base + JZ_REG_MMC_DMAC);
 723                         } else {
 724                                 cmdat |= JZ_MMC_CMDAT_DMA_EN;
 725                         }
 726                 } else if (host->version >= JZ_MMC_JZ4780) {
 727                         writel(0, host->base + JZ_REG_MMC_DMAC);
 728                 }
 729
 730                 writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
 731                 writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
 732         }
 733
 734         writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
 735         writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
 736         writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
 737
 738         jz4740_mmc_clock_enable(host, 1);
 739 }
 740
 741 static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
 742 {
 743         struct mmc_command *cmd = host->req->cmd;
 744         struct mmc_data *data = cmd->data;
 745         int direction;
 746
 747         if (data->flags & MMC_DATA_READ)
 748                 direction = SG_MITER_TO_SG;
 749         else
 750                 direction = SG_MITER_FROM_SG;
 751
 752         sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
 753 }
 754
 755
 756 static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
 757 {
 758         struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
 759         struct mmc_command *cmd = host->req->cmd;
 760         struct mmc_request *req = host->req;
 761         struct mmc_data *data = cmd->data;
 762         bool timeout = false;
 763
 764         if (cmd->error)
 765                 host->state = JZ4740_MMC_STATE_DONE;
 766
 767         switch (host->state) {
 768         case JZ4740_MMC_STATE_READ_RESPONSE:
 769                 if (cmd->flags & MMC_RSP_PRESENT)
 770                         jz4740_mmc_read_response(host, cmd);
 771
 772                 if (!data)
 773                         break;
 774
 775                 jz_mmc_prepare_data_transfer(host);
 776                 fallthrough;
 777
 778         case JZ4740_MMC_STATE_TRANSFER_DATA:
 779                 if (host->use_dma) {
 780                         /* Use DMA if enabled.
 781                          * Data transfer direction is defined later by
 782                          * relying on data flags in
 783                          * jz4740_mmc_prepare_dma_data() and
 784                          * jz4740_mmc_start_dma_transfer().
 785                          */
 786                         timeout = jz4740_mmc_start_dma_transfer(host, data);
 787                         data->bytes_xfered = data->blocks * data->blksz;
 788                 } else if (data->flags & MMC_DATA_READ)
 789                         /* Use PIO if DMA is not enabled.
 790                          * Data transfer direction was defined before
 791                          * by relying on data flags in
 792                          * jz_mmc_prepare_data_transfer().
 793                          */
 794                         timeout = jz4740_mmc_read_data(host, data);
 795                 else
 796                         timeout = jz4740_mmc_write_data(host, data);
 797
 798                 if (unlikely(timeout)) {
 799                         host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
 800                         break;
 801                 }
 802
 803                 jz4740_mmc_transfer_check_state(host, data);
 804
 805                 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
 806                 if (unlikely(timeout)) {
 807                         host->state = JZ4740_MMC_STATE_SEND_STOP;
 808                         break;
 809                 }
 810                 jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
 811                 fallthrough;
 812
 813         case JZ4740_MMC_STATE_SEND_STOP:
 814                 if (!req->stop)
 815                         break;
 816
 817                 jz4740_mmc_send_command(host, req->stop);
 818
 819                 if (mmc_resp_type(req->stop) & MMC_RSP_BUSY) {
 820                         timeout = jz4740_mmc_poll_irq(host,
 821                                                       JZ_MMC_IRQ_PRG_DONE);
 822                         if (timeout) {
 823                                 host->state = JZ4740_MMC_STATE_DONE;
 824                                 break;
 825                         }
 826                 }
 827                 fallthrough;
 828
 829         case JZ4740_MMC_STATE_DONE:
 830                 break;
 831         }
 832
 833         if (!timeout)
 834                 jz4740_mmc_request_done(host);
 835
 836         return IRQ_HANDLED;
 837 }
 838
 839 static irqreturn_t jz_mmc_irq(int irq, void *devid)
 840 {
 841         struct jz4740_mmc_host *host = devid;
 842         struct mmc_command *cmd = host->cmd;
 843         uint32_t irq_reg, status, tmp;
 844
 845         status = readl(host->base + JZ_REG_MMC_STATUS);
 846         irq_reg = jz4740_mmc_read_irq_reg(host);
 847
 848         tmp = irq_reg;
 849         irq_reg &= ~host->irq_mask;
 850
 851         tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
 852                 JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
 853
 854         if (tmp != irq_reg)
 855                 jz4740_mmc_write_irq_reg(host, tmp & ~irq_reg);
 856
 857         if (irq_reg & JZ_MMC_IRQ_SDIO) {
 858                 jz4740_mmc_write_irq_reg(host, JZ_MMC_IRQ_SDIO);
 859                 mmc_signal_sdio_irq(host->mmc);
 860                 irq_reg &= ~JZ_MMC_IRQ_SDIO;
 861         }
 862
 863         if (host->req && cmd && irq_reg) {
 864                 if (test_and_clear_bit(0, &host->waiting)) {
 865                         del_timer(&host->timeout_timer);
 866
 867                         if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
 868                                 cmd->error = -ETIMEDOUT;
 869                         } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
 870                                 cmd->error = -EIO;
 871                         } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
 872                                     JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
 873                                 if (cmd->data)
 874                                         cmd->data->error = -EIO;
 875                                 cmd->error = -EIO;
 876                         }
 877
 878                         jz4740_mmc_set_irq_enabled(host, irq_reg, false);
 879                         jz4740_mmc_write_irq_reg(host, irq_reg);
 880
 881                         return IRQ_WAKE_THREAD;
 882                 }
 883         }
 884
 885         return IRQ_HANDLED;
 886 }
 887
 888 static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
 889 {
 890         int div = 0;
 891         int real_rate;
 892
 893         jz4740_mmc_clock_disable(host);
 894         clk_set_rate(host->clk, host->mmc->f_max);
 895
 896         real_rate = clk_get_rate(host->clk);
 897
 898         while (real_rate > rate && div < 7) {
 899                 ++div;
 900                 real_rate >>= 1;
 901         }
 902
 903         writew(div, host->base + JZ_REG_MMC_CLKRT);
 904
 905         if (real_rate > 25000000) {
 906                 if (host->version >= JZ_MMC_JZ4780) {
 907                         writel(JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY |
 908                                    JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY |
 909                                    JZ_MMC_LPM_LOW_POWER_MODE_EN,
 910                                    host->base + JZ_REG_MMC_LPM);
 911                 } else if (host->version >= JZ_MMC_JZ4760) {
 912                         writel(JZ_MMC_LPM_DRV_RISING |
 913                                    JZ_MMC_LPM_LOW_POWER_MODE_EN,
 914                                    host->base + JZ_REG_MMC_LPM);
 915                 } else if (host->version >= JZ_MMC_JZ4725B)
 916                         writel(JZ_MMC_LPM_LOW_POWER_MODE_EN,
 917                                    host->base + JZ_REG_MMC_LPM);
 918         }
 919
 920         return real_rate;
 921 }
 922
 923 static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
 924 {
 925         struct jz4740_mmc_host *host = mmc_priv(mmc);
 926
 927         host->req = req;
 928
 929         jz4740_mmc_write_irq_reg(host, ~0);
 930         jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
 931
 932         host->state = JZ4740_MMC_STATE_READ_RESPONSE;
 933         set_bit(0, &host->waiting);
 934         mod_timer(&host->timeout_timer,
 935                   jiffies + msecs_to_jiffies(JZ_MMC_REQ_TIMEOUT_MS));
 936         jz4740_mmc_send_command(host, req->cmd);
 937 }
 938
 939 static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 940 {
 941         struct jz4740_mmc_host *host = mmc_priv(mmc);
 942         int ret;
 943
 944         if (ios->clock)
 945                 jz4740_mmc_set_clock_rate(host, ios->clock);
 946
 947         switch (ios->power_mode) {
 948         case MMC_POWER_UP:
 949                 jz4740_mmc_reset(host);
 950                 if (!IS_ERR(mmc->supply.vmmc))
 951                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
 952                 host->cmdat |= JZ_MMC_CMDAT_INIT;
 953                 clk_prepare_enable(host->clk);
 954                 break;
 955         case MMC_POWER_ON:
 956                 if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
 957                         ret = regulator_enable(mmc->supply.vqmmc);
 958                         if (ret)
 959                                 dev_err(&host->pdev->dev, "Failed to set vqmmc power!\n");
 960                         else
 961                                 host->vqmmc_enabled = true;
 962                 }
 963                 break;
 964         case MMC_POWER_OFF:
 965                 if (!IS_ERR(mmc->supply.vmmc))
 966                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
 967                 if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
 968                         regulator_disable(mmc->supply.vqmmc);
 969                         host->vqmmc_enabled = false;
 970                 }
 971                 clk_disable_unprepare(host->clk);
 972                 break;
 973         default:
 974                 break;
 975         }
 976
 977         switch (ios->bus_width) {
 978         case MMC_BUS_WIDTH_1:
 979                 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
 980                 break;
 981         case MMC_BUS_WIDTH_4:
 982                 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
 983                 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
 984                 break;
 985         case MMC_BUS_WIDTH_8:
 986                 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_MASK;
 987                 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_8BIT;
 988                 break;
 989         default:
 990                 break;
 991         }
 992 }
 993
 994 static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 995 {
 996         struct jz4740_mmc_host *host = mmc_priv(mmc);
 997         jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
 998 }
 999
1000 static int jz4740_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
1001 {
1002         int ret;
1003
1004         /* vqmmc regulator is available */
1005         if (!IS_ERR(mmc->supply.vqmmc)) {
1006                 ret = mmc_regulator_set_vqmmc(mmc, ios);
1007                 return ret < 0 ? ret : 0;
1008         }
1009
1010         /* no vqmmc regulator, assume fixed regulator at 3/3.3V */
1011         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1012                 return 0;
1013
1014         return -EINVAL;
1015 }
1016
1017 static const struct mmc_host_ops jz4740_mmc_ops = {
1018         .request        = jz4740_mmc_request,
1019         .pre_req        = jz4740_mmc_pre_request,
1020         .post_req       = jz4740_mmc_post_request,
1021         .set_ios        = jz4740_mmc_set_ios,
1022         .get_ro         = mmc_gpio_get_ro,
1023         .get_cd         = mmc_gpio_get_cd,
1024         .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
1025         .start_signal_voltage_switch = jz4740_voltage_switch,
1026 };
1027
1028 static const struct of_device_id jz4740_mmc_of_match[] = {
1029         { .compatible = "ingenic,jz4740-mmc", .data = (void *) JZ_MMC_JZ4740 },
1030         { .compatible = "ingenic,jz4725b-mmc", .data = (void *)JZ_MMC_JZ4725B },
1031         { .compatible = "ingenic,jz4760-mmc", .data = (void *) JZ_MMC_JZ4760 },
1032         { .compatible = "ingenic,jz4775-mmc", .data = (void *) JZ_MMC_JZ4780 },
1033         { .compatible = "ingenic,jz4780-mmc", .data = (void *) JZ_MMC_JZ4780 },
1034         { .compatible = "ingenic,x1000-mmc", .data = (void *) JZ_MMC_X1000 },
1035         {},
1036 };
1037 MODULE_DEVICE_TABLE(of, jz4740_mmc_of_match);
1038
1039 static int jz4740_mmc_probe(struct platform_device* pdev)
1040 {
1041         int ret;
1042         struct mmc_host *mmc;
1043         struct jz4740_mmc_host *host;
1044
1045         mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
1046         if (!mmc) {
1047                 dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
1048                 return -ENOMEM;
1049         }
1050
1051         host = mmc_priv(mmc);
1052
1053         /* Default if no match is JZ4740 */
1054         host->version = (enum jz4740_mmc_version)device_get_match_data(&pdev->dev);
1055
1056         ret = mmc_of_parse(mmc);
1057         if (ret) {
1058                 dev_err_probe(&pdev->dev, ret, "could not parse device properties\n");
1059                 goto err_free_host;
1060         }
1061
1062         mmc_regulator_get_supply(mmc);
1063
1064         host->irq = platform_get_irq(pdev, 0);
1065         if (host->irq < 0) {
1066                 ret = host->irq;
1067                 goto err_free_host;
1068         }
1069
1070         host->clk = devm_clk_get(&pdev->dev, "mmc");
1071         if (IS_ERR(host->clk)) {
1072                 ret = PTR_ERR(host->clk);
1073                 dev_err(&pdev->dev, "Failed to get mmc clock\n");
1074                 goto err_free_host;
1075         }
1076
1077         host->base = devm_platform_get_and_ioremap_resource(pdev, 0, &host->mem_res);
1078         if (IS_ERR(host->base)) {
1079                 ret = PTR_ERR(host->base);
1080                 goto err_free_host;
1081         }
1082
1083         mmc->ops = &jz4740_mmc_ops;
1084         if (!mmc->f_max)
1085                 mmc->f_max = JZ_MMC_CLK_RATE;
1086
1087         /*
1088          * There seems to be a problem with this driver on the JZ4760 and
1089          * JZ4760B SoCs. There, when using the maximum rate supported (50 MHz),
1090          * the communication fails with many SD cards.
1091          * Until this bug is sorted out, limit the maximum rate to 24 MHz.
1092          */
1093         if (host->version == JZ_MMC_JZ4760 && mmc->f_max > JZ_MMC_CLK_RATE)
1094                 mmc->f_max = JZ_MMC_CLK_RATE;
1095
1096         mmc->f_min = mmc->f_max / 128;
1097         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1098
1099         /*
1100          * We use a fixed timeout of 5s, hence inform the core about it. A
1101          * future improvement should instead respect the cmd->busy_timeout.
1102          */
1103         mmc->max_busy_timeout = JZ_MMC_REQ_TIMEOUT_MS;
1104
1105         mmc->max_blk_size = (1 << 10) - 1;
1106         mmc->max_blk_count = (1 << 15) - 1;
1107         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1108
1109         mmc->max_segs = 128;
1110         mmc->max_seg_size = mmc->max_req_size;
1111
1112         host->mmc = mmc;
1113         host->pdev = pdev;
1114         spin_lock_init(&host->lock);
1115         host->irq_mask = ~0;
1116
1117         jz4740_mmc_reset(host);
1118
1119         ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
1120                         dev_name(&pdev->dev), host);
1121         if (ret) {
1122                 dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
1123                 goto err_free_host;
1124         }
1125
1126         jz4740_mmc_clock_disable(host);
1127         timer_setup(&host->timeout_timer, jz4740_mmc_timeout, 0);
1128
1129         ret = jz4740_mmc_acquire_dma_channels(host);
1130         if (ret == -EPROBE_DEFER)
1131                 goto err_free_irq;
1132         host->use_dma = !ret;
1133
1134         platform_set_drvdata(pdev, host);
1135         ret = mmc_add_host(mmc);
1136
1137         if (ret) {
1138                 dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
1139                 goto err_release_dma;
1140         }
1141         dev_info(&pdev->dev, "Ingenic SD/MMC card driver registered\n");
1142
1143         dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
1144                  host->use_dma ? "DMA" : "PIO",
1145                  (mmc->caps & MMC_CAP_8_BIT_DATA) ? 8 :
1146                  ((mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1));
1147
1148         return 0;
1149
1150 err_release_dma:
1151         if (host->use_dma)
1152                 jz4740_mmc_release_dma_channels(host);
1153 err_free_irq:
1154         free_irq(host->irq, host);
1155 err_free_host:
1156         mmc_free_host(mmc);
1157
1158         return ret;
1159 }
1160
1161 static void jz4740_mmc_remove(struct platform_device *pdev)
1162 {
1163         struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
1164
1165         del_timer_sync(&host->timeout_timer);
1166         jz4740_mmc_set_irq_enabled(host, 0xff, false);
1167         jz4740_mmc_reset(host);
1168
1169         mmc_remove_host(host->mmc);
1170
1171         free_irq(host->irq, host);
1172
1173         if (host->use_dma)
1174                 jz4740_mmc_release_dma_channels(host);
1175
1176         mmc_free_host(host->mmc);
1177 }
1178
1179 static int jz4740_mmc_suspend(struct device *dev)
1180 {
1181         return pinctrl_pm_select_sleep_state(dev);
1182 }
1183
1184 static int jz4740_mmc_resume(struct device *dev)
1185 {
1186         return pinctrl_select_default_state(dev);
1187 }
1188
1189 static DEFINE_SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
1190                                 jz4740_mmc_resume);
1191
1192 static struct platform_driver jz4740_mmc_driver = {
1193         .probe = jz4740_mmc_probe,
1194         .remove = jz4740_mmc_remove,
1195         .driver = {
1196                 .name = "jz4740-mmc",
1197                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1198                 .of_match_table = jz4740_mmc_of_match,
1199                 .pm = pm_sleep_ptr(&jz4740_mmc_pm_ops),
1200         },
1201 };
1202
1203 module_platform_driver(jz4740_mmc_driver);
1204
1205 MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
1206 MODULE_LICENSE("GPL");
1207 MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");