drivers/mmc/host/sh_mmcif.c

   1 /*
   2  * MMCIF eMMC driver.
   3  *
   4  * Copyright (C) 2010 Renesas Solutions Corp.
   5  * Yusuke Goda <yusuke.goda.sx@renesas.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License.
  10  *
  11  *
  12  * TODO
  13  *  1. DMA
  14  *  2. Power management
  15  *  3. Handle MMC errors better
  16  *
  17  */
  18
  19 /*
  20  * The MMCIF driver is now processing MMC requests asynchronously, according
  21  * to the Linux MMC API requirement.
  22  *
  23  * The MMCIF driver processes MMC requests in up to 3 stages: command, optional
  24  * data, and optional stop. To achieve asynchronous processing each of these
  25  * stages is split into two halves: a top and a bottom half. The top half
  26  * initialises the hardware, installs a timeout handler to handle completion
  27  * timeouts, and returns. In case of the command stage this immediately returns
  28  * control to the caller, leaving all further processing to run asynchronously.
  29  * All further request processing is performed by the bottom halves.
  30  *
  31  * The bottom half further consists of a "hard" IRQ handler, an IRQ handler
  32  * thread, a DMA completion callback, if DMA is used, a timeout work, and
  33  * request- and stage-specific handler methods.
  34  *
  35  * Each bottom half run begins with either a hardware interrupt, a DMA callback
  36  * invocation, or a timeout work run. In case of an error or a successful
  37  * processing completion, the MMC core is informed and the request processing is
  38  * finished. In case processing has to continue, i.e., if data has to be read
  39  * from or written to the card, or if a stop command has to be sent, the next
  40  * top half is called, which performs the necessary hardware handling and
  41  * reschedules the timeout work. This returns the driver state machine into the
  42  * bottom half waiting state.
  43  */
  44
  45 #include <linux/bitops.h>
  46 #include <linux/clk.h>
  47 #include <linux/completion.h>
  48 #include <linux/delay.h>
  49 #include <linux/dma-mapping.h>
  50 #include <linux/dmaengine.h>
  51 #include <linux/mmc/card.h>
  52 #include <linux/mmc/core.h>
  53 #include <linux/mmc/host.h>
  54 #include <linux/mmc/mmc.h>
  55 #include <linux/mmc/sdio.h>
  56 #include <linux/mmc/sh_mmcif.h>
  57 #include <linux/pagemap.h>
  58 #include <linux/platform_device.h>
  59 #include <linux/pm_qos.h>
  60 #include <linux/pm_runtime.h>
  61 #include <linux/spinlock.h>
  62 #include <linux/module.h>
  63
  64 #define DRIVER_NAME     "sh_mmcif"
  65 #define DRIVER_VERSION  "2010-04-28"
  66
  67 /* CE_CMD_SET */
  68 #define CMD_MASK                0x3f000000
  69 #define CMD_SET_RTYP_NO         ((0 << 23) | (0 << 22))
  70 #define CMD_SET_RTYP_6B         ((0 << 23) | (1 << 22)) /* R1/R1b/R3/R4/R5 */
  71 #define CMD_SET_RTYP_17B        ((1 << 23) | (0 << 22)) /* R2 */
  72 #define CMD_SET_RBSY            (1 << 21) /* R1b */
  73 #define CMD_SET_CCSEN           (1 << 20)
  74 #define CMD_SET_WDAT            (1 << 19) /* 1: on data, 0: no data */
  75 #define CMD_SET_DWEN            (1 << 18) /* 1: write, 0: read */
  76 #define CMD_SET_CMLTE           (1 << 17) /* 1: multi block trans, 0: single */
  77 #define CMD_SET_CMD12EN         (1 << 16) /* 1: CMD12 auto issue */
  78 #define CMD_SET_RIDXC_INDEX     ((0 << 15) | (0 << 14)) /* index check */
  79 #define CMD_SET_RIDXC_BITS      ((0 << 15) | (1 << 14)) /* check bits check */
  80 #define CMD_SET_RIDXC_NO        ((1 << 15) | (0 << 14)) /* no check */
  81 #define CMD_SET_CRC7C           ((0 << 13) | (0 << 12)) /* CRC7 check*/
  82 #define CMD_SET_CRC7C_BITS      ((0 << 13) | (1 << 12)) /* check bits check*/
  83 #define CMD_SET_CRC7C_INTERNAL  ((1 << 13) | (0 << 12)) /* internal CRC7 check*/
  84 #define CMD_SET_CRC16C          (1 << 10) /* 0: CRC16 check*/
  85 #define CMD_SET_CRCSTE          (1 << 8) /* 1: not receive CRC status */
  86 #define CMD_SET_TBIT            (1 << 7) /* 1: tran mission bit "Low" */
  87 #define CMD_SET_OPDM            (1 << 6) /* 1: open/drain */
  88 #define CMD_SET_CCSH            (1 << 5)
  89 #define CMD_SET_DATW_1          ((0 << 1) | (0 << 0)) /* 1bit */
  90 #define CMD_SET_DATW_4          ((0 << 1) | (1 << 0)) /* 4bit */
  91 #define CMD_SET_DATW_8          ((1 << 1) | (0 << 0)) /* 8bit */
  92
  93 /* CE_CMD_CTRL */
  94 #define CMD_CTRL_BREAK          (1 << 0)
  95
  96 /* CE_BLOCK_SET */
  97 #define BLOCK_SIZE_MASK         0x0000ffff
  98
  99 /* CE_INT */
 100 #define INT_CCSDE               (1 << 29)
 101 #define INT_CMD12DRE            (1 << 26)
 102 #define INT_CMD12RBE            (1 << 25)
 103 #define INT_CMD12CRE            (1 << 24)
 104 #define INT_DTRANE              (1 << 23)
 105 #define INT_BUFRE               (1 << 22)
 106 #define INT_BUFWEN              (1 << 21)
 107 #define INT_BUFREN              (1 << 20)
 108 #define INT_CCSRCV              (1 << 19)
 109 #define INT_RBSYE               (1 << 17)
 110 #define INT_CRSPE               (1 << 16)
 111 #define INT_CMDVIO              (1 << 15)
 112 #define INT_BUFVIO              (1 << 14)
 113 #define INT_WDATERR             (1 << 11)
 114 #define INT_RDATERR             (1 << 10)
 115 #define INT_RIDXERR             (1 << 9)
 116 #define INT_RSPERR              (1 << 8)
 117 #define INT_CCSTO               (1 << 5)
 118 #define INT_CRCSTO              (1 << 4)
 119 #define INT_WDATTO              (1 << 3)
 120 #define INT_RDATTO              (1 << 2)
 121 #define INT_RBSYTO              (1 << 1)
 122 #define INT_RSPTO               (1 << 0)
 123 #define INT_ERR_STS             (INT_CMDVIO | INT_BUFVIO | INT_WDATERR |  \
 124                                  INT_RDATERR | INT_RIDXERR | INT_RSPERR | \
 125                                  INT_CCSTO | INT_CRCSTO | INT_WDATTO |    \
 126                                  INT_RDATTO | INT_RBSYTO | INT_RSPTO)
 127
 128 /* CE_INT_MASK */
 129 #define MASK_ALL                0x00000000
 130 #define MASK_MCCSDE             (1 << 29)
 131 #define MASK_MCMD12DRE          (1 << 26)
 132 #define MASK_MCMD12RBE          (1 << 25)
 133 #define MASK_MCMD12CRE          (1 << 24)
 134 #define MASK_MDTRANE            (1 << 23)
 135 #define MASK_MBUFRE             (1 << 22)
 136 #define MASK_MBUFWEN            (1 << 21)
 137 #define MASK_MBUFREN            (1 << 20)
 138 #define MASK_MCCSRCV            (1 << 19)
 139 #define MASK_MRBSYE             (1 << 17)
 140 #define MASK_MCRSPE             (1 << 16)
 141 #define MASK_MCMDVIO            (1 << 15)
 142 #define MASK_MBUFVIO            (1 << 14)
 143 #define MASK_MWDATERR           (1 << 11)
 144 #define MASK_MRDATERR           (1 << 10)
 145 #define MASK_MRIDXERR           (1 << 9)
 146 #define MASK_MRSPERR            (1 << 8)
 147 #define MASK_MCCSTO             (1 << 5)
 148 #define MASK_MCRCSTO            (1 << 4)
 149 #define MASK_MWDATTO            (1 << 3)
 150 #define MASK_MRDATTO            (1 << 2)
 151 #define MASK_MRBSYTO            (1 << 1)
 152 #define MASK_MRSPTO             (1 << 0)
 153
 154 #define MASK_START_CMD          (MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR | \
 155                                  MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR | \
 156                                  MASK_MCCSTO | MASK_MCRCSTO | MASK_MWDATTO | \
 157                                  MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO)
 158
 159 /* CE_HOST_STS1 */
 160 #define STS1_CMDSEQ             (1 << 31)
 161
 162 /* CE_HOST_STS2 */
 163 #define STS2_CRCSTE             (1 << 31)
 164 #define STS2_CRC16E             (1 << 30)
 165 #define STS2_AC12CRCE           (1 << 29)
 166 #define STS2_RSPCRC7E           (1 << 28)
 167 #define STS2_CRCSTEBE           (1 << 27)
 168 #define STS2_RDATEBE            (1 << 26)
 169 #define STS2_AC12REBE           (1 << 25)
 170 #define STS2_RSPEBE             (1 << 24)
 171 #define STS2_AC12IDXE           (1 << 23)
 172 #define STS2_RSPIDXE            (1 << 22)
 173 #define STS2_CCSTO              (1 << 15)
 174 #define STS2_RDATTO             (1 << 14)
 175 #define STS2_DATBSYTO           (1 << 13)
 176 #define STS2_CRCSTTO            (1 << 12)
 177 #define STS2_AC12BSYTO          (1 << 11)
 178 #define STS2_RSPBSYTO           (1 << 10)
 179 #define STS2_AC12RSPTO          (1 << 9)
 180 #define STS2_RSPTO              (1 << 8)
 181 #define STS2_CRC_ERR            (STS2_CRCSTE | STS2_CRC16E |            \
 182                                  STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE)
 183 #define STS2_TIMEOUT_ERR        (STS2_CCSTO | STS2_RDATTO |             \
 184                                  STS2_DATBSYTO | STS2_CRCSTTO |         \
 185                                  STS2_AC12BSYTO | STS2_RSPBSYTO |       \
 186                                  STS2_AC12RSPTO | STS2_RSPTO)
 187
 188 #define CLKDEV_EMMC_DATA        52000000 /* 52MHz */
 189 #define CLKDEV_MMC_DATA         20000000 /* 20MHz */
 190 #define CLKDEV_INIT             400000   /* 400 KHz */
 191
 192 enum mmcif_state {
 193         STATE_IDLE,
 194         STATE_REQUEST,
 195         STATE_IOS,
 196 };
 197
 198 enum mmcif_wait_for {
 199         MMCIF_WAIT_FOR_REQUEST,
 200         MMCIF_WAIT_FOR_CMD,
 201         MMCIF_WAIT_FOR_MREAD,
 202         MMCIF_WAIT_FOR_MWRITE,
 203         MMCIF_WAIT_FOR_READ,
 204         MMCIF_WAIT_FOR_WRITE,
 205         MMCIF_WAIT_FOR_READ_END,
 206         MMCIF_WAIT_FOR_WRITE_END,
 207         MMCIF_WAIT_FOR_STOP,
 208 };
 209
 210 struct sh_mmcif_host {
 211         struct mmc_host *mmc;
 212         struct mmc_request *mrq;
 213         struct platform_device *pd;
 214         struct sh_dmae_slave dma_slave_tx;
 215         struct sh_dmae_slave dma_slave_rx;
 216         struct clk *hclk;
 217         unsigned int clk;
 218         int bus_width;
 219         bool sd_error;
 220         bool dying;
 221         long timeout;
 222         void __iomem *addr;
 223         u32 *pio_ptr;
 224         spinlock_t lock;                /* protect sh_mmcif_host::state */
 225         enum mmcif_state state;
 226         enum mmcif_wait_for wait_for;
 227         struct delayed_work timeout_work;
 228         size_t blocksize;
 229         int sg_idx;
 230         int sg_blkidx;
 231         bool power;
 232         bool card_present;
 233
 234         /* DMA support */
 235         struct dma_chan         *chan_rx;
 236         struct dma_chan         *chan_tx;
 237         struct completion       dma_complete;
 238         bool                    dma_active;
 239 };
 240
 241 static inline void sh_mmcif_bitset(struct sh_mmcif_host *host,
 242                                         unsigned int reg, u32 val)
 243 {
 244         writel(val | readl(host->addr + reg), host->addr + reg);
 245 }
 246
 247 static inline void sh_mmcif_bitclr(struct sh_mmcif_host *host,
 248                                         unsigned int reg, u32 val)
 249 {
 250         writel(~val & readl(host->addr + reg), host->addr + reg);
 251 }
 252
 253 static void mmcif_dma_complete(void *arg)
 254 {
 255         struct sh_mmcif_host *host = arg;
 256         struct mmc_data *data = host->mrq->data;
 257
 258         dev_dbg(&host->pd->dev, "Command completed\n");
 259
 260         if (WARN(!data, "%s: NULL data in DMA completion!\n",
 261                  dev_name(&host->pd->dev)))
 262                 return;
 263
 264         if (data->flags & MMC_DATA_READ)
 265                 dma_unmap_sg(host->chan_rx->device->dev,
 266                              data->sg, data->sg_len,
 267                              DMA_FROM_DEVICE);
 268         else
 269                 dma_unmap_sg(host->chan_tx->device->dev,
 270                              data->sg, data->sg_len,
 271                              DMA_TO_DEVICE);
 272
 273         complete(&host->dma_complete);
 274 }
 275
 276 static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host)
 277 {
 278         struct mmc_data *data = host->mrq->data;
 279         struct scatterlist *sg = data->sg;
 280         struct dma_async_tx_descriptor *desc = NULL;
 281         struct dma_chan *chan = host->chan_rx;
 282         dma_cookie_t cookie = -EINVAL;
 283         int ret;
 284
 285         ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
 286                          DMA_FROM_DEVICE);
 287         if (ret > 0) {
 288                 host->dma_active = true;
 289                 desc = dmaengine_prep_slave_sg(chan, sg, ret,
 290                         DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 291         }
 292
 293         if (desc) {
 294                 desc->callback = mmcif_dma_complete;
 295                 desc->callback_param = host;
 296                 cookie = dmaengine_submit(desc);
 297                 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN);
 298                 dma_async_issue_pending(chan);
 299         }
 300         dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
 301                 __func__, data->sg_len, ret, cookie);
 302
 303         if (!desc) {
 304                 /* DMA failed, fall back to PIO */
 305                 if (ret >= 0)
 306                         ret = -EIO;
 307                 host->chan_rx = NULL;
 308                 host->dma_active = false;
 309                 dma_release_channel(chan);
 310                 /* Free the Tx channel too */
 311                 chan = host->chan_tx;
 312                 if (chan) {
 313                         host->chan_tx = NULL;
 314                         dma_release_channel(chan);
 315                 }
 316                 dev_warn(&host->pd->dev,
 317                          "DMA failed: %d, falling back to PIO\n", ret);
 318                 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
 319         }
 320
 321         dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
 322                 desc, cookie, data->sg_len);
 323 }
 324
 325 static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
 326 {
 327         struct mmc_data *data = host->mrq->data;
 328         struct scatterlist *sg = data->sg;
 329         struct dma_async_tx_descriptor *desc = NULL;
 330         struct dma_chan *chan = host->chan_tx;
 331         dma_cookie_t cookie = -EINVAL;
 332         int ret;
 333
 334         ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
 335                          DMA_TO_DEVICE);
 336         if (ret > 0) {
 337                 host->dma_active = true;
 338                 desc = dmaengine_prep_slave_sg(chan, sg, ret,
 339                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 340         }
 341
 342         if (desc) {
 343                 desc->callback = mmcif_dma_complete;
 344                 desc->callback_param = host;
 345                 cookie = dmaengine_submit(desc);
 346                 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAWEN);
 347                 dma_async_issue_pending(chan);
 348         }
 349         dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
 350                 __func__, data->sg_len, ret, cookie);
 351
 352         if (!desc) {
 353                 /* DMA failed, fall back to PIO */
 354                 if (ret >= 0)
 355                         ret = -EIO;
 356                 host->chan_tx = NULL;
 357                 host->dma_active = false;
 358                 dma_release_channel(chan);
 359                 /* Free the Rx channel too */
 360                 chan = host->chan_rx;
 361                 if (chan) {
 362                         host->chan_rx = NULL;
 363                         dma_release_channel(chan);
 364                 }
 365                 dev_warn(&host->pd->dev,
 366                          "DMA failed: %d, falling back to PIO\n", ret);
 367                 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
 368         }
 369
 370         dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d\n", __func__,
 371                 desc, cookie);
 372 }
 373
 374 static bool sh_mmcif_filter(struct dma_chan *chan, void *arg)
 375 {
 376         dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
 377         chan->private = arg;
 378         return true;
 379 }
 380
 381 static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
 382                                  struct sh_mmcif_plat_data *pdata)
 383 {
 384         struct sh_dmae_slave *tx, *rx;
 385         host->dma_active = false;
 386
 387         /* We can only either use DMA for both Tx and Rx or not use it at all */
 388         if (pdata->dma) {
 389                 dev_warn(&host->pd->dev,
 390                          "Update your platform to use embedded DMA slave IDs\n");
 391                 tx = &pdata->dma->chan_priv_tx;
 392                 rx = &pdata->dma->chan_priv_rx;
 393         } else {
 394                 tx = &host->dma_slave_tx;
 395                 tx->slave_id = pdata->slave_id_tx;
 396                 rx = &host->dma_slave_rx;
 397                 rx->slave_id = pdata->slave_id_rx;
 398         }
 399         if (tx->slave_id > 0 && rx->slave_id > 0) {
 400                 dma_cap_mask_t mask;
 401
 402                 dma_cap_zero(mask);
 403                 dma_cap_set(DMA_SLAVE, mask);
 404
 405                 host->chan_tx = dma_request_channel(mask, sh_mmcif_filter, tx);
 406                 dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,
 407                         host->chan_tx);
 408
 409                 if (!host->chan_tx)
 410                         return;
 411
 412                 host->chan_rx = dma_request_channel(mask, sh_mmcif_filter, rx);
 413                 dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,
 414                         host->chan_rx);
 415
 416                 if (!host->chan_rx) {
 417                         dma_release_channel(host->chan_tx);
 418                         host->chan_tx = NULL;
 419                         return;
 420                 }
 421
 422                 init_completion(&host->dma_complete);
 423         }
 424 }
 425
 426 static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
 427 {
 428         sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
 429         /* Descriptors are freed automatically */
 430         if (host->chan_tx) {
 431                 struct dma_chan *chan = host->chan_tx;
 432                 host->chan_tx = NULL;
 433                 dma_release_channel(chan);
 434         }
 435         if (host->chan_rx) {
 436                 struct dma_chan *chan = host->chan_rx;
 437                 host->chan_rx = NULL;
 438                 dma_release_channel(chan);
 439         }
 440
 441         host->dma_active = false;
 442 }
 443
 444 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
 445 {
 446         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
 447
 448         sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
 449         sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR);
 450
 451         if (!clk)
 452                 return;
 453         if (p->sup_pclk && clk == host->clk)
 454                 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_SUP_PCLK);
 455         else
 456                 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR &
 457                                 ((fls(DIV_ROUND_UP(host->clk,
 458                                                    clk) - 1) - 1) << 16));
 459
 460         sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
 461 }
 462
 463 static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
 464 {
 465         u32 tmp;
 466
 467         tmp = 0x010f0000 & sh_mmcif_readl(host->addr, MMCIF_CE_CLK_CTRL);
 468
 469         sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_ON);
 470         sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF);
 471         sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp |
 472                 SRSPTO_256 | SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
 473         /* byte swap on */
 474         sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
 475 }
 476
 477 static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
 478 {
 479         u32 state1, state2;
 480         int ret, timeout;
 481
 482         host->sd_error = false;
 483
 484         state1 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1);
 485         state2 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS2);
 486         dev_dbg(&host->pd->dev, "ERR HOST_STS1 = %08x\n", state1);
 487         dev_dbg(&host->pd->dev, "ERR HOST_STS2 = %08x\n", state2);
 488
 489         if (state1 & STS1_CMDSEQ) {
 490                 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, CMD_CTRL_BREAK);
 491                 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, ~CMD_CTRL_BREAK);
 492                 for (timeout = 10000000; timeout; timeout--) {
 493                         if (!(sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1)
 494                               & STS1_CMDSEQ))
 495                                 break;
 496                         mdelay(1);
 497                 }
 498                 if (!timeout) {
 499                         dev_err(&host->pd->dev,
 500                                 "Forced end of command sequence timeout err\n");
 501                         return -EIO;
 502                 }
 503                 sh_mmcif_sync_reset(host);
 504                 dev_dbg(&host->pd->dev, "Forced end of command sequence\n");
 505                 return -EIO;
 506         }
 507
 508         if (state2 & STS2_CRC_ERR) {
 509                 dev_dbg(&host->pd->dev, ": CRC error\n");
 510                 ret = -EIO;
 511         } else if (state2 & STS2_TIMEOUT_ERR) {
 512                 dev_dbg(&host->pd->dev, ": Timeout\n");
 513                 ret = -ETIMEDOUT;
 514         } else {
 515                 dev_dbg(&host->pd->dev, ": End/Index error\n");
 516                 ret = -EIO;
 517         }
 518         return ret;
 519 }
 520
 521 static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p)
 522 {
 523         struct mmc_data *data = host->mrq->data;
 524
 525         host->sg_blkidx += host->blocksize;
 526
 527         /* data->sg->length must be a multiple of host->blocksize? */
 528         BUG_ON(host->sg_blkidx > data->sg->length);
 529
 530         if (host->sg_blkidx == data->sg->length) {
 531                 host->sg_blkidx = 0;
 532                 if (++host->sg_idx < data->sg_len)
 533                         host->pio_ptr = sg_virt(++data->sg);
 534         } else {
 535                 host->pio_ptr = p;
 536         }
 537
 538         if (host->sg_idx == data->sg_len)
 539                 return false;
 540
 541         return true;
 542 }
 543
 544 static void sh_mmcif_single_read(struct sh_mmcif_host *host,
 545                                  struct mmc_request *mrq)
 546 {
 547         host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
 548                            BLOCK_SIZE_MASK) + 3;
 549
 550         host->wait_for = MMCIF_WAIT_FOR_READ;
 551         schedule_delayed_work(&host->timeout_work, host->timeout);
 552
 553         /* buf read enable */
 554         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
 555 }
 556
 557 static bool sh_mmcif_read_block(struct sh_mmcif_host *host)
 558 {
 559         struct mmc_data *data = host->mrq->data;
 560         u32 *p = sg_virt(data->sg);
 561         int i;
 562
 563         if (host->sd_error) {
 564                 data->error = sh_mmcif_error_manage(host);
 565                 return false;
 566         }
 567
 568         for (i = 0; i < host->blocksize / 4; i++)
 569                 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
 570
 571         /* buffer read end */
 572         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
 573         host->wait_for = MMCIF_WAIT_FOR_READ_END;
 574
 575         return true;
 576 }
 577
 578 static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
 579                                 struct mmc_request *mrq)
 580 {
 581         struct mmc_data *data = mrq->data;
 582
 583         if (!data->sg_len || !data->sg->length)
 584                 return;
 585
 586         host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
 587                 BLOCK_SIZE_MASK;
 588
 589         host->wait_for = MMCIF_WAIT_FOR_MREAD;
 590         host->sg_idx = 0;
 591         host->sg_blkidx = 0;
 592         host->pio_ptr = sg_virt(data->sg);
 593         schedule_delayed_work(&host->timeout_work, host->timeout);
 594         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
 595 }
 596
 597 static bool sh_mmcif_mread_block(struct sh_mmcif_host *host)
 598 {
 599         struct mmc_data *data = host->mrq->data;
 600         u32 *p = host->pio_ptr;
 601         int i;
 602
 603         if (host->sd_error) {
 604                 data->error = sh_mmcif_error_manage(host);
 605                 return false;
 606         }
 607
 608         BUG_ON(!data->sg->length);
 609
 610         for (i = 0; i < host->blocksize / 4; i++)
 611                 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
 612
 613         if (!sh_mmcif_next_block(host, p))
 614                 return false;
 615
 616         schedule_delayed_work(&host->timeout_work, host->timeout);
 617         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
 618
 619         return true;
 620 }
 621
 622 static void sh_mmcif_single_write(struct sh_mmcif_host *host,
 623                                         struct mmc_request *mrq)
 624 {
 625         host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
 626                            BLOCK_SIZE_MASK) + 3;
 627
 628         host->wait_for = MMCIF_WAIT_FOR_WRITE;
 629         schedule_delayed_work(&host->timeout_work, host->timeout);
 630
 631         /* buf write enable */
 632         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
 633 }
 634
 635 static bool sh_mmcif_write_block(struct sh_mmcif_host *host)
 636 {
 637         struct mmc_data *data = host->mrq->data;
 638         u32 *p = sg_virt(data->sg);
 639         int i;
 640
 641         if (host->sd_error) {
 642                 data->error = sh_mmcif_error_manage(host);
 643                 return false;
 644         }
 645
 646         for (i = 0; i < host->blocksize / 4; i++)
 647                 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
 648
 649         /* buffer write end */
 650         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
 651         host->wait_for = MMCIF_WAIT_FOR_WRITE_END;
 652
 653         return true;
 654 }
 655
 656 static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
 657                                 struct mmc_request *mrq)
 658 {
 659         struct mmc_data *data = mrq->data;
 660
 661         if (!data->sg_len || !data->sg->length)
 662                 return;
 663
 664         host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
 665                 BLOCK_SIZE_MASK;
 666
 667         host->wait_for = MMCIF_WAIT_FOR_MWRITE;
 668         host->sg_idx = 0;
 669         host->sg_blkidx = 0;
 670         host->pio_ptr = sg_virt(data->sg);
 671         schedule_delayed_work(&host->timeout_work, host->timeout);
 672         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
 673 }
 674
 675 static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host)
 676 {
 677         struct mmc_data *data = host->mrq->data;
 678         u32 *p = host->pio_ptr;
 679         int i;
 680
 681         if (host->sd_error) {
 682                 data->error = sh_mmcif_error_manage(host);
 683                 return false;
 684         }
 685
 686         BUG_ON(!data->sg->length);
 687
 688         for (i = 0; i < host->blocksize / 4; i++)
 689                 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
 690
 691         if (!sh_mmcif_next_block(host, p))
 692                 return false;
 693
 694         schedule_delayed_work(&host->timeout_work, host->timeout);
 695         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
 696
 697         return true;
 698 }
 699
 700 static void sh_mmcif_get_response(struct sh_mmcif_host *host,
 701                                                 struct mmc_command *cmd)
 702 {
 703         if (cmd->flags & MMC_RSP_136) {
 704                 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP3);
 705                 cmd->resp[1] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP2);
 706                 cmd->resp[2] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP1);
 707                 cmd->resp[3] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
 708         } else
 709                 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
 710 }
 711
 712 static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
 713                                                 struct mmc_command *cmd)
 714 {
 715         cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP_CMD12);
 716 }
 717
 718 static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
 719                             struct mmc_request *mrq)
 720 {
 721         struct mmc_data *data = mrq->data;
 722         struct mmc_command *cmd = mrq->cmd;
 723         u32 opc = cmd->opcode;
 724         u32 tmp = 0;
 725
 726         /* Response Type check */
 727         switch (mmc_resp_type(cmd)) {
 728         case MMC_RSP_NONE:
 729                 tmp |= CMD_SET_RTYP_NO;
 730                 break;
 731         case MMC_RSP_R1:
 732         case MMC_RSP_R1B:
 733         case MMC_RSP_R3:
 734                 tmp |= CMD_SET_RTYP_6B;
 735                 break;
 736         case MMC_RSP_R2:
 737                 tmp |= CMD_SET_RTYP_17B;
 738                 break;
 739         default:
 740                 dev_err(&host->pd->dev, "Unsupported response type.\n");
 741                 break;
 742         }
 743         switch (opc) {
 744         /* RBSY */
 745         case MMC_SWITCH:
 746         case MMC_STOP_TRANSMISSION:
 747         case MMC_SET_WRITE_PROT:
 748         case MMC_CLR_WRITE_PROT:
 749         case MMC_ERASE:
 750                 tmp |= CMD_SET_RBSY;
 751                 break;
 752         }
 753         /* WDAT / DATW */
 754         if (data) {
 755                 tmp |= CMD_SET_WDAT;
 756                 switch (host->bus_width) {
 757                 case MMC_BUS_WIDTH_1:
 758                         tmp |= CMD_SET_DATW_1;
 759                         break;
 760                 case MMC_BUS_WIDTH_4:
 761                         tmp |= CMD_SET_DATW_4;
 762                         break;
 763                 case MMC_BUS_WIDTH_8:
 764                         tmp |= CMD_SET_DATW_8;
 765                         break;
 766                 default:
 767                         dev_err(&host->pd->dev, "Unsupported bus width.\n");
 768                         break;
 769                 }
 770         }
 771         /* DWEN */
 772         if (opc == MMC_WRITE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK)
 773                 tmp |= CMD_SET_DWEN;
 774         /* CMLTE/CMD12EN */
 775         if (opc == MMC_READ_MULTIPLE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) {
 776                 tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN;
 777                 sh_mmcif_bitset(host, MMCIF_CE_BLOCK_SET,
 778                                 data->blocks << 16);
 779         }
 780         /* RIDXC[1:0] check bits */
 781         if (opc == MMC_SEND_OP_COND || opc == MMC_ALL_SEND_CID ||
 782             opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
 783                 tmp |= CMD_SET_RIDXC_BITS;
 784         /* RCRC7C[1:0] check bits */
 785         if (opc == MMC_SEND_OP_COND)
 786                 tmp |= CMD_SET_CRC7C_BITS;
 787         /* RCRC7C[1:0] internal CRC7 */
 788         if (opc == MMC_ALL_SEND_CID ||
 789                 opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
 790                 tmp |= CMD_SET_CRC7C_INTERNAL;
 791
 792         return (opc << 24) | tmp;
 793 }
 794
 795 static int sh_mmcif_data_trans(struct sh_mmcif_host *host,
 796                                struct mmc_request *mrq, u32 opc)
 797 {
 798         switch (opc) {
 799         case MMC_READ_MULTIPLE_BLOCK:
 800                 sh_mmcif_multi_read(host, mrq);
 801                 return 0;
 802         case MMC_WRITE_MULTIPLE_BLOCK:
 803                 sh_mmcif_multi_write(host, mrq);
 804                 return 0;
 805         case MMC_WRITE_BLOCK:
 806                 sh_mmcif_single_write(host, mrq);
 807                 return 0;
 808         case MMC_READ_SINGLE_BLOCK:
 809         case MMC_SEND_EXT_CSD:
 810                 sh_mmcif_single_read(host, mrq);
 811                 return 0;
 812         default:
 813                 dev_err(&host->pd->dev, "UNSUPPORTED CMD = d'%08d\n", opc);
 814                 return -EINVAL;
 815         }
 816 }
 817
 818 static void sh_mmcif_start_cmd(struct sh_mmcif_host *host,
 819                                struct mmc_request *mrq)
 820 {
 821         struct mmc_command *cmd = mrq->cmd;
 822         u32 opc = cmd->opcode;
 823         u32 mask;
 824
 825         switch (opc) {
 826         /* response busy check */
 827         case MMC_SWITCH:
 828         case MMC_STOP_TRANSMISSION:
 829         case MMC_SET_WRITE_PROT:
 830         case MMC_CLR_WRITE_PROT:
 831         case MMC_ERASE:
 832                 mask = MASK_START_CMD | MASK_MRBSYE;
 833                 break;
 834         default:
 835                 mask = MASK_START_CMD | MASK_MCRSPE;
 836                 break;
 837         }
 838
 839         if (mrq->data) {
 840                 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, 0);
 841                 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET,
 842                                 mrq->data->blksz);
 843         }
 844         opc = sh_mmcif_set_cmd(host, mrq);
 845
 846         sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0);
 847         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, mask);
 848         /* set arg */
 849         sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg);
 850         /* set cmd */
 851         sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc);
 852
 853         host->wait_for = MMCIF_WAIT_FOR_CMD;
 854         schedule_delayed_work(&host->timeout_work, host->timeout);
 855 }
 856
 857 static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host,
 858                               struct mmc_request *mrq)
 859 {
 860         switch (mrq->cmd->opcode) {
 861         case MMC_READ_MULTIPLE_BLOCK:
 862                 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
 863                 break;
 864         case MMC_WRITE_MULTIPLE_BLOCK:
 865                 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
 866                 break;
 867         default:
 868                 dev_err(&host->pd->dev, "unsupported stop cmd\n");
 869                 mrq->stop->error = sh_mmcif_error_manage(host);
 870                 return;
 871         }
 872
 873         host->wait_for = MMCIF_WAIT_FOR_STOP;
 874         schedule_delayed_work(&host->timeout_work, host->timeout);
 875 }
 876
 877 static void sh_mmcif_request(struct mmc_host *mmc, struct mmc_request *mrq)
 878 {
 879         struct sh_mmcif_host *host = mmc_priv(mmc);
 880         unsigned long flags;
 881
 882         spin_lock_irqsave(&host->lock, flags);
 883         if (host->state != STATE_IDLE) {
 884                 spin_unlock_irqrestore(&host->lock, flags);
 885                 mrq->cmd->error = -EAGAIN;
 886                 mmc_request_done(mmc, mrq);
 887                 return;
 888         }
 889
 890         host->state = STATE_REQUEST;
 891         spin_unlock_irqrestore(&host->lock, flags);
 892
 893         switch (mrq->cmd->opcode) {
 894         /* MMCIF does not support SD/SDIO command */
 895         case MMC_SLEEP_AWAKE: /* = SD_IO_SEND_OP_COND (5) */
 896         case MMC_SEND_EXT_CSD: /* = SD_SEND_IF_COND (8) */
 897                 if ((mrq->cmd->flags & MMC_CMD_MASK) != MMC_CMD_BCR)
 898                         break;
 899         case MMC_APP_CMD:
 900                 host->state = STATE_IDLE;
 901                 mrq->cmd->error = -ETIMEDOUT;
 902                 mmc_request_done(mmc, mrq);
 903                 return;
 904         default:
 905                 break;
 906         }
 907
 908         host->mrq = mrq;
 909
 910         sh_mmcif_start_cmd(host, mrq);
 911 }
 912
 913 static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 914 {
 915         struct sh_mmcif_host *host = mmc_priv(mmc);
 916         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
 917         unsigned long flags;
 918
 919         spin_lock_irqsave(&host->lock, flags);
 920         if (host->state != STATE_IDLE) {
 921                 spin_unlock_irqrestore(&host->lock, flags);
 922                 return;
 923         }
 924
 925         host->state = STATE_IOS;
 926         spin_unlock_irqrestore(&host->lock, flags);
 927
 928         if (ios->power_mode == MMC_POWER_UP) {
 929                 if (!host->card_present) {
 930                         /* See if we also get DMA */
 931                         sh_mmcif_request_dma(host, host->pd->dev.platform_data);
 932                         host->card_present = true;
 933                 }
 934         } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) {
 935                 /* clock stop */
 936                 sh_mmcif_clock_control(host, 0);
 937                 if (ios->power_mode == MMC_POWER_OFF) {
 938                         if (host->card_present) {
 939                                 sh_mmcif_release_dma(host);
 940                                 host->card_present = false;
 941                         }
 942                 }
 943                 if (host->power) {
 944                         pm_runtime_put(&host->pd->dev);
 945                         host->power = false;
 946                         if (p->down_pwr && ios->power_mode == MMC_POWER_OFF)
 947                                 p->down_pwr(host->pd);
 948                 }
 949                 host->state = STATE_IDLE;
 950                 return;
 951         }
 952
 953         if (ios->clock) {
 954                 if (!host->power) {
 955                         if (p->set_pwr)
 956                                 p->set_pwr(host->pd, ios->power_mode);
 957                         pm_runtime_get_sync(&host->pd->dev);
 958                         host->power = true;
 959                         sh_mmcif_sync_reset(host);
 960                 }
 961                 sh_mmcif_clock_control(host, ios->clock);
 962         }
 963
 964         host->bus_width = ios->bus_width;
 965         host->state = STATE_IDLE;
 966 }
 967
 968 static int sh_mmcif_get_cd(struct mmc_host *mmc)
 969 {
 970         struct sh_mmcif_host *host = mmc_priv(mmc);
 971         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
 972
 973         if (!p->get_cd)
 974                 return -ENOSYS;
 975         else
 976                 return p->get_cd(host->pd);
 977 }
 978
 979 static struct mmc_host_ops sh_mmcif_ops = {
 980         .request        = sh_mmcif_request,
 981         .set_ios        = sh_mmcif_set_ios,
 982         .get_cd         = sh_mmcif_get_cd,
 983 };
 984
 985 static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host)
 986 {
 987         struct mmc_command *cmd = host->mrq->cmd;
 988         struct mmc_data *data = host->mrq->data;
 989         long time;
 990
 991         if (host->sd_error) {
 992                 switch (cmd->opcode) {
 993                 case MMC_ALL_SEND_CID:
 994                 case MMC_SELECT_CARD:
 995                 case MMC_APP_CMD:
 996                         cmd->error = -ETIMEDOUT;
 997                         host->sd_error = false;
 998                         break;
 999                 default:
1000                         cmd->error = sh_mmcif_error_manage(host);
1001                         dev_dbg(&host->pd->dev, "Cmd(d'%d) error %d\n",
1002                                 cmd->opcode, cmd->error);
1003                         break;
1004                 }
1005                 return false;
1006         }
1007         if (!(cmd->flags & MMC_RSP_PRESENT)) {
1008                 cmd->error = 0;
1009                 return false;
1010         }
1011
1012         sh_mmcif_get_response(host, cmd);
1013
1014         if (!data)
1015                 return false;
1016
1017         if (data->flags & MMC_DATA_READ) {
1018                 if (host->chan_rx)
1019                         sh_mmcif_start_dma_rx(host);
1020         } else {
1021                 if (host->chan_tx)
1022                         sh_mmcif_start_dma_tx(host);
1023         }
1024
1025         if (!host->dma_active) {
1026                 data->error = sh_mmcif_data_trans(host, host->mrq, cmd->opcode);
1027                 if (!data->error)
1028                         return true;
1029                 return false;
1030         }
1031
1032         /* Running in the IRQ thread, can sleep */
1033         time = wait_for_completion_interruptible_timeout(&host->dma_complete,
1034                                                          host->timeout);
1035         if (host->sd_error) {
1036                 dev_err(host->mmc->parent,
1037                         "Error IRQ while waiting for DMA completion!\n");
1038                 /* Woken up by an error IRQ: abort DMA */
1039                 if (data->flags & MMC_DATA_READ)
1040                         dmaengine_terminate_all(host->chan_rx);
1041                 else
1042                         dmaengine_terminate_all(host->chan_tx);
1043                 data->error = sh_mmcif_error_manage(host);
1044         } else if (!time) {
1045                 data->error = -ETIMEDOUT;
1046         } else if (time < 0) {
1047                 data->error = time;
1048         }
1049         sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC,
1050                         BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
1051         host->dma_active = false;
1052
1053         if (data->error)
1054                 data->bytes_xfered = 0;
1055
1056         return false;
1057 }
1058
1059 static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
1060 {
1061         struct sh_mmcif_host *host = dev_id;
1062         struct mmc_request *mrq = host->mrq;
1063         struct mmc_data *data = mrq->data;
1064
1065         cancel_delayed_work_sync(&host->timeout_work);
1066
1067         /*
1068          * All handlers return true, if processing continues, and false, if the
1069          * request has to be completed - successfully or not
1070          */
1071         switch (host->wait_for) {
1072         case MMCIF_WAIT_FOR_REQUEST:
1073                 /* We're too late, the timeout has already kicked in */
1074                 return IRQ_HANDLED;
1075         case MMCIF_WAIT_FOR_CMD:
1076                 if (sh_mmcif_end_cmd(host))
1077                         /* Wait for data */
1078                         return IRQ_HANDLED;
1079                 break;
1080         case MMCIF_WAIT_FOR_MREAD:
1081                 if (sh_mmcif_mread_block(host))
1082                         /* Wait for more data */
1083                         return IRQ_HANDLED;
1084                 break;
1085         case MMCIF_WAIT_FOR_READ:
1086                 if (sh_mmcif_read_block(host))
1087                         /* Wait for data end */
1088                         return IRQ_HANDLED;
1089                 break;
1090         case MMCIF_WAIT_FOR_MWRITE:
1091                 if (sh_mmcif_mwrite_block(host))
1092                         /* Wait data to write */
1093                         return IRQ_HANDLED;
1094                 break;
1095         case MMCIF_WAIT_FOR_WRITE:
1096                 if (sh_mmcif_write_block(host))
1097                         /* Wait for data end */
1098                         return IRQ_HANDLED;
1099                 break;
1100         case MMCIF_WAIT_FOR_STOP:
1101                 if (host->sd_error) {
1102                         mrq->stop->error = sh_mmcif_error_manage(host);
1103                         break;
1104                 }
1105                 sh_mmcif_get_cmd12response(host, mrq->stop);
1106                 mrq->stop->error = 0;
1107                 break;
1108         case MMCIF_WAIT_FOR_READ_END:
1109         case MMCIF_WAIT_FOR_WRITE_END:
1110                 if (host->sd_error)
1111                         data->error = sh_mmcif_error_manage(host);
1112                 break;
1113         default:
1114                 BUG();
1115         }
1116
1117         if (host->wait_for != MMCIF_WAIT_FOR_STOP) {
1118                 if (!mrq->cmd->error && data && !data->error)
1119                         data->bytes_xfered =
1120                                 data->blocks * data->blksz;
1121
1122                 if (mrq->stop && !mrq->cmd->error && (!data || !data->error)) {
1123                         sh_mmcif_stop_cmd(host, mrq);
1124                         if (!mrq->stop->error)
1125                                 return IRQ_HANDLED;
1126                 }
1127         }
1128
1129         host->wait_for = MMCIF_WAIT_FOR_REQUEST;
1130         host->state = STATE_IDLE;
1131         host->mrq = NULL;
1132         mmc_request_done(host->mmc, mrq);
1133
1134         return IRQ_HANDLED;
1135 }
1136
1137 static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
1138 {
1139         struct sh_mmcif_host *host = dev_id;
1140         u32 state;
1141         int err = 0;
1142
1143         state = sh_mmcif_readl(host->addr, MMCIF_CE_INT);
1144
1145         if (state & INT_ERR_STS) {
1146                 /* error interrupts - process first */
1147                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
1148                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
1149                 err = 1;
1150         } else if (state & INT_RBSYE) {
1151                 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
1152                                 ~(INT_RBSYE | INT_CRSPE));
1153                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MRBSYE);
1154         } else if (state & INT_CRSPE) {
1155                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_CRSPE);
1156                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCRSPE);
1157         } else if (state & INT_BUFREN) {
1158                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFREN);
1159                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
1160         } else if (state & INT_BUFWEN) {
1161                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFWEN);
1162                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
1163         } else if (state & INT_CMD12DRE) {
1164                 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
1165                         ~(INT_CMD12DRE | INT_CMD12RBE |
1166                           INT_CMD12CRE | INT_BUFRE));
1167                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
1168         } else if (state & INT_BUFRE) {
1169                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFRE);
1170                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
1171         } else if (state & INT_DTRANE) {
1172                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_DTRANE);
1173                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
1174         } else if (state & INT_CMD12RBE) {
1175                 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
1176                                 ~(INT_CMD12RBE | INT_CMD12CRE));
1177                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
1178         } else {
1179                 dev_dbg(&host->pd->dev, "Unsupported interrupt: 0x%x\n", state);
1180                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
1181                 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
1182                 err = 1;
1183         }
1184         if (err) {
1185                 host->sd_error = true;
1186                 dev_dbg(&host->pd->dev, "int err state = %08x\n", state);
1187         }
1188         if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) {
1189                 if (!host->dma_active)
1190                         return IRQ_WAKE_THREAD;
1191                 else if (host->sd_error)
1192                         mmcif_dma_complete(host);
1193         } else {
1194                 dev_dbg(&host->pd->dev, "Unexpected IRQ 0x%x\n", state);
1195         }
1196
1197         return IRQ_HANDLED;
1198 }
1199
1200 static void mmcif_timeout_work(struct work_struct *work)
1201 {
1202         struct delayed_work *d = container_of(work, struct delayed_work, work);
1203         struct sh_mmcif_host *host = container_of(d, struct sh_mmcif_host, timeout_work);
1204         struct mmc_request *mrq = host->mrq;
1205
1206         if (host->dying)
1207                 /* Don't run after mmc_remove_host() */
1208                 return;
1209
1210         /*
1211          * Handle races with cancel_delayed_work(), unless
1212          * cancel_delayed_work_sync() is used
1213          */
1214         switch (host->wait_for) {
1215         case MMCIF_WAIT_FOR_CMD:
1216                 mrq->cmd->error = sh_mmcif_error_manage(host);
1217                 break;
1218         case MMCIF_WAIT_FOR_STOP:
1219                 mrq->stop->error = sh_mmcif_error_manage(host);
1220                 break;
1221         case MMCIF_WAIT_FOR_MREAD:
1222         case MMCIF_WAIT_FOR_MWRITE:
1223         case MMCIF_WAIT_FOR_READ:
1224         case MMCIF_WAIT_FOR_WRITE:
1225         case MMCIF_WAIT_FOR_READ_END:
1226         case MMCIF_WAIT_FOR_WRITE_END:
1227                 mrq->data->error = sh_mmcif_error_manage(host);
1228                 break;
1229         default:
1230                 BUG();
1231         }
1232
1233         host->state = STATE_IDLE;
1234         host->wait_for = MMCIF_WAIT_FOR_REQUEST;
1235         host->mrq = NULL;
1236         mmc_request_done(host->mmc, mrq);
1237 }
1238
1239 static int __devinit sh_mmcif_probe(struct platform_device *pdev)
1240 {
1241         int ret = 0, irq[2];
1242         struct mmc_host *mmc;
1243         struct sh_mmcif_host *host;
1244         struct sh_mmcif_plat_data *pd;
1245         struct resource *res;
1246         void __iomem *reg;
1247         char clk_name[8];
1248
1249         irq[0] = platform_get_irq(pdev, 0);
1250         irq[1] = platform_get_irq(pdev, 1);
1251         if (irq[0] < 0 || irq[1] < 0) {
1252                 dev_err(&pdev->dev, "Get irq error\n");
1253                 return -ENXIO;
1254         }
1255         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1256         if (!res) {
1257                 dev_err(&pdev->dev, "platform_get_resource error.\n");
1258                 return -ENXIO;
1259         }
1260         reg = ioremap(res->start, resource_size(res));
1261         if (!reg) {
1262                 dev_err(&pdev->dev, "ioremap error.\n");
1263                 return -ENOMEM;
1264         }
1265         pd = pdev->dev.platform_data;
1266         if (!pd) {
1267                 dev_err(&pdev->dev, "sh_mmcif plat data error.\n");
1268                 ret = -ENXIO;
1269                 goto clean_up;
1270         }
1271         mmc = mmc_alloc_host(sizeof(struct sh_mmcif_host), &pdev->dev);
1272         if (!mmc) {
1273                 ret = -ENOMEM;
1274                 goto clean_up;
1275         }
1276         host            = mmc_priv(mmc);
1277         host->mmc       = mmc;
1278         host->addr      = reg;
1279         host->timeout   = 1000;
1280
1281         snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);
1282         host->hclk = clk_get(&pdev->dev, clk_name);
1283         if (IS_ERR(host->hclk)) {
1284                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
1285                 ret = PTR_ERR(host->hclk);
1286                 goto clean_up1;
1287         }
1288         clk_enable(host->hclk);
1289         host->clk = clk_get_rate(host->hclk);
1290         host->pd = pdev;
1291
1292         spin_lock_init(&host->lock);
1293
1294         mmc->ops = &sh_mmcif_ops;
1295         mmc->f_max = host->clk / 2;
1296         mmc->f_min = host->clk / 512;
1297         if (pd->ocr)
1298                 mmc->ocr_avail = pd->ocr;
1299         mmc->caps = MMC_CAP_MMC_HIGHSPEED;
1300         if (pd->caps)
1301                 mmc->caps |= pd->caps;
1302         mmc->max_segs = 32;
1303         mmc->max_blk_size = 512;
1304         mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs;
1305         mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
1306         mmc->max_seg_size = mmc->max_req_size;
1307
1308         sh_mmcif_sync_reset(host);
1309         platform_set_drvdata(pdev, host);
1310
1311         pm_runtime_enable(&pdev->dev);
1312         host->power = false;
1313
1314         ret = pm_runtime_resume(&pdev->dev);
1315         if (ret < 0)
1316                 goto clean_up2;
1317
1318         INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
1319
1320         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1321
1322         ret = request_threaded_irq(irq[0], sh_mmcif_intr, sh_mmcif_irqt, 0, "sh_mmc:error", host);
1323         if (ret) {
1324                 dev_err(&pdev->dev, "request_irq error (sh_mmc:error)\n");
1325                 goto clean_up3;
1326         }
1327         ret = request_threaded_irq(irq[1], sh_mmcif_intr, sh_mmcif_irqt, 0, "sh_mmc:int", host);
1328         if (ret) {
1329                 dev_err(&pdev->dev, "request_irq error (sh_mmc:int)\n");
1330                 goto clean_up4;
1331         }
1332
1333         ret = mmc_add_host(mmc);
1334         if (ret < 0)
1335                 goto clean_up5;
1336
1337         dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1338
1339         dev_info(&pdev->dev, "driver version %s\n", DRIVER_VERSION);
1340         dev_dbg(&pdev->dev, "chip ver H'%04x\n",
1341                 sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0x0000ffff);
1342         return ret;
1343
1344 clean_up5:
1345         free_irq(irq[1], host);
1346 clean_up4:
1347         free_irq(irq[0], host);
1348 clean_up3:
1349         pm_runtime_suspend(&pdev->dev);
1350 clean_up2:
1351         pm_runtime_disable(&pdev->dev);
1352         clk_disable(host->hclk);
1353 clean_up1:
1354         mmc_free_host(mmc);
1355 clean_up:
1356         if (reg)
1357                 iounmap(reg);
1358         return ret;
1359 }
1360
1361 static int __devexit sh_mmcif_remove(struct platform_device *pdev)
1362 {
1363         struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1364         int irq[2];
1365
1366         host->dying = true;
1367         pm_runtime_get_sync(&pdev->dev);
1368
1369         dev_pm_qos_hide_latency_limit(&pdev->dev);
1370
1371         mmc_remove_host(host->mmc);
1372         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1373
1374         /*
1375          * FIXME: cancel_delayed_work(_sync)() and free_irq() race with the
1376          * mmc_remove_host() call above. But swapping order doesn't help either
1377          * (a query on the linux-mmc mailing list didn't bring any replies).
1378          */
1379         cancel_delayed_work_sync(&host->timeout_work);
1380
1381         if (host->addr)
1382                 iounmap(host->addr);
1383
1384         irq[0] = platform_get_irq(pdev, 0);
1385         irq[1] = platform_get_irq(pdev, 1);
1386
1387         free_irq(irq[0], host);
1388         free_irq(irq[1], host);
1389
1390         platform_set_drvdata(pdev, NULL);
1391
1392         clk_disable(host->hclk);
1393         mmc_free_host(host->mmc);
1394         pm_runtime_put_sync(&pdev->dev);
1395         pm_runtime_disable(&pdev->dev);
1396
1397         return 0;
1398 }
1399
1400 #ifdef CONFIG_PM
1401 static int sh_mmcif_suspend(struct device *dev)
1402 {
1403         struct platform_device *pdev = to_platform_device(dev);
1404         struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1405         int ret = mmc_suspend_host(host->mmc);
1406
1407         if (!ret) {
1408                 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1409                 clk_disable(host->hclk);
1410         }
1411
1412         return ret;
1413 }
1414
1415 static int sh_mmcif_resume(struct device *dev)
1416 {
1417         struct platform_device *pdev = to_platform_device(dev);
1418         struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1419
1420         clk_enable(host->hclk);
1421
1422         return mmc_resume_host(host->mmc);
1423 }
1424 #else
1425 #define sh_mmcif_suspend        NULL
1426 #define sh_mmcif_resume         NULL
1427 #endif  /* CONFIG_PM */
1428
1429 static const struct dev_pm_ops sh_mmcif_dev_pm_ops = {
1430         .suspend = sh_mmcif_suspend,
1431         .resume = sh_mmcif_resume,
1432 };
1433
1434 static struct platform_driver sh_mmcif_driver = {
1435         .probe          = sh_mmcif_probe,
1436         .remove         = sh_mmcif_remove,
1437         .driver         = {
1438                 .name   = DRIVER_NAME,
1439                 .pm     = &sh_mmcif_dev_pm_ops,
1440         },
1441 };
1442
1443 module_platform_driver(sh_mmcif_driver);
1444
1445 MODULE_DESCRIPTION("SuperH on-chip MMC/eMMC interface driver");
1446 MODULE_LICENSE("GPL");
1447 MODULE_ALIAS("platform:" DRIVER_NAME);
1448 MODULE_AUTHOR("Yusuke Goda <yusuke.goda.sx@renesas.com>");