drivers/mmc/host/dw_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Synopsys DesignWare Multimedia Card Interface driver
   4  *  (Based on NXP driver for lpc 31xx)
   5  *
   6  * Copyright (C) 2009 NXP Semiconductors
   7  * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
   8  */
   9
  10 #include <linux/blkdev.h>
  11 #include <linux/clk.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/err.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/iopoll.h>
  19 #include <linux/ioport.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/slab.h>
  25 #include <linux/stat.h>
  26 #include <linux/delay.h>
  27 #include <linux/irq.h>
  28 #include <linux/mmc/card.h>
  29 #include <linux/mmc/host.h>
  30 #include <linux/mmc/mmc.h>
  31 #include <linux/mmc/sd.h>
  32 #include <linux/mmc/sdio.h>
  33 #include <linux/bitops.h>
  34 #include <linux/regulator/consumer.h>
  35 #include <linux/of.h>
  36 #include <linux/of_gpio.h>
  37 #include <linux/mmc/slot-gpio.h>
  38
  39 #include "dw_mmc.h"
  40
  41 /* Common flag combinations */
  42 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
  43                                  SDMMC_INT_HTO | SDMMC_INT_SBE  | \
  44                                  SDMMC_INT_EBE | SDMMC_INT_HLE)
  45 #define DW_MCI_CMD_ERROR_FLAGS  (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
  46                                  SDMMC_INT_RESP_ERR | SDMMC_INT_HLE)
  47 #define DW_MCI_ERROR_FLAGS      (DW_MCI_DATA_ERROR_FLAGS | \
  48                                  DW_MCI_CMD_ERROR_FLAGS)
  49 #define DW_MCI_SEND_STATUS      1
  50 #define DW_MCI_RECV_STATUS      2
  51 #define DW_MCI_DMA_THRESHOLD    16
  52
  53 #define DW_MCI_FREQ_MAX 200000000       /* unit: HZ */
  54 #define DW_MCI_FREQ_MIN 100000          /* unit: HZ */
  55
  56 #define IDMAC_INT_CLR           (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
  57                                  SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
  58                                  SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
  59                                  SDMMC_IDMAC_INT_TI)
  60
  61 #define DESC_RING_BUF_SZ        PAGE_SIZE
  62
  63 struct idmac_desc_64addr {
  64         u32             des0;   /* Control Descriptor */
  65 #define IDMAC_OWN_CLR64(x) \
  66         !((x) & cpu_to_le32(IDMAC_DES0_OWN))
  67
  68         u32             des1;   /* Reserved */
  69
  70         u32             des2;   /*Buffer sizes */
  71 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
  72         ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \
  73          ((cpu_to_le32(s)) & cpu_to_le32(0x1fff)))
  74
  75         u32             des3;   /* Reserved */
  76
  77         u32             des4;   /* Lower 32-bits of Buffer Address Pointer 1*/
  78         u32             des5;   /* Upper 32-bits of Buffer Address Pointer 1*/
  79
  80         u32             des6;   /* Lower 32-bits of Next Descriptor Address */
  81         u32             des7;   /* Upper 32-bits of Next Descriptor Address */
  82 };
  83
  84 struct idmac_desc {
  85         __le32          des0;   /* Control Descriptor */
  86 #define IDMAC_DES0_DIC  BIT(1)
  87 #define IDMAC_DES0_LD   BIT(2)
  88 #define IDMAC_DES0_FD   BIT(3)
  89 #define IDMAC_DES0_CH   BIT(4)
  90 #define IDMAC_DES0_ER   BIT(5)
  91 #define IDMAC_DES0_CES  BIT(30)
  92 #define IDMAC_DES0_OWN  BIT(31)
  93
  94         __le32          des1;   /* Buffer sizes */
  95 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
  96         ((d)->des1 = ((d)->des1 & cpu_to_le32(0x03ffe000)) | (cpu_to_le32((s) & 0x1fff)))
  97
  98         __le32          des2;   /* buffer 1 physical address */
  99
 100         __le32          des3;   /* buffer 2 physical address */
 101 };
 102
 103 /* Each descriptor can transfer up to 4KB of data in chained mode */
 104 #define DW_MCI_DESC_DATA_LENGTH 0x1000
 105
 106 #if defined(CONFIG_DEBUG_FS)
 107 static int dw_mci_req_show(struct seq_file *s, void *v)
 108 {
 109         struct dw_mci_slot *slot = s->private;
 110         struct mmc_request *mrq;
 111         struct mmc_command *cmd;
 112         struct mmc_command *stop;
 113         struct mmc_data *data;
 114
 115         /* Make sure we get a consistent snapshot */
 116         spin_lock_bh(&slot->host->lock);
 117         mrq = slot->mrq;
 118
 119         if (mrq) {
 120                 cmd = mrq->cmd;
 121                 data = mrq->data;
 122                 stop = mrq->stop;
 123
 124                 if (cmd)
 125                         seq_printf(s,
 126                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 127                                    cmd->opcode, cmd->arg, cmd->flags,
 128                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
 129                                    cmd->resp[2], cmd->error);
 130                 if (data)
 131                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
 132                                    data->bytes_xfered, data->blocks,
 133                                    data->blksz, data->flags, data->error);
 134                 if (stop)
 135                         seq_printf(s,
 136                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 137                                    stop->opcode, stop->arg, stop->flags,
 138                                    stop->resp[0], stop->resp[1], stop->resp[2],
 139                                    stop->resp[2], stop->error);
 140         }
 141
 142         spin_unlock_bh(&slot->host->lock);
 143
 144         return 0;
 145 }
 146 DEFINE_SHOW_ATTRIBUTE(dw_mci_req);
 147
 148 static int dw_mci_regs_show(struct seq_file *s, void *v)
 149 {
 150         struct dw_mci *host = s->private;
 151
 152         pm_runtime_get_sync(host->dev);
 153
 154         seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS));
 155         seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS));
 156         seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD));
 157         seq_printf(s, "CTRL:\t0x%08x\n", mci_readl(host, CTRL));
 158         seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK));
 159         seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA));
 160
 161         pm_runtime_put_autosuspend(host->dev);
 162
 163         return 0;
 164 }
 165 DEFINE_SHOW_ATTRIBUTE(dw_mci_regs);
 166
 167 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
 168 {
 169         struct mmc_host *mmc = slot->mmc;
 170         struct dw_mci *host = slot->host;
 171         struct dentry *root;
 172
 173         root = mmc->debugfs_root;
 174         if (!root)
 175                 return;
 176
 177         debugfs_create_file("regs", S_IRUSR, root, host, &dw_mci_regs_fops);
 178         debugfs_create_file("req", S_IRUSR, root, slot, &dw_mci_req_fops);
 179         debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
 180         debugfs_create_x32("pending_events", S_IRUSR, root,
 181                            (u32 *)&host->pending_events);
 182         debugfs_create_x32("completed_events", S_IRUSR, root,
 183                            (u32 *)&host->completed_events);
 184 }
 185 #endif /* defined(CONFIG_DEBUG_FS) */
 186
 187 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
 188 {
 189         u32 ctrl;
 190
 191         ctrl = mci_readl(host, CTRL);
 192         ctrl |= reset;
 193         mci_writel(host, CTRL, ctrl);
 194
 195         /* wait till resets clear */
 196         if (readl_poll_timeout_atomic(host->regs + SDMMC_CTRL, ctrl,
 197                                       !(ctrl & reset),
 198                                       1, 500 * USEC_PER_MSEC)) {
 199                 dev_err(host->dev,
 200                         "Timeout resetting block (ctrl reset %#x)\n",
 201                         ctrl & reset);
 202                 return false;
 203         }
 204
 205         return true;
 206 }
 207
 208 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags)
 209 {
 210         u32 status;
 211
 212         /*
 213          * Databook says that before issuing a new data transfer command
 214          * we need to check to see if the card is busy.  Data transfer commands
 215          * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that.
 216          *
 217          * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is
 218          * expected.
 219          */
 220         if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) &&
 221             !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) {
 222                 if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS,
 223                                               status,
 224                                               !(status & SDMMC_STATUS_BUSY),
 225                                               10, 500 * USEC_PER_MSEC))
 226                         dev_err(host->dev, "Busy; trying anyway\n");
 227         }
 228 }
 229
 230 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
 231 {
 232         struct dw_mci *host = slot->host;
 233         unsigned int cmd_status = 0;
 234
 235         mci_writel(host, CMDARG, arg);
 236         wmb(); /* drain writebuffer */
 237         dw_mci_wait_while_busy(host, cmd);
 238         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
 239
 240         if (readl_poll_timeout_atomic(host->regs + SDMMC_CMD, cmd_status,
 241                                       !(cmd_status & SDMMC_CMD_START),
 242                                       1, 500 * USEC_PER_MSEC))
 243                 dev_err(&slot->mmc->class_dev,
 244                         "Timeout sending command (cmd %#x arg %#x status %#x)\n",
 245                         cmd, arg, cmd_status);
 246 }
 247
 248 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
 249 {
 250         struct dw_mci_slot *slot = mmc_priv(mmc);
 251         struct dw_mci *host = slot->host;
 252         u32 cmdr;
 253
 254         cmd->error = -EINPROGRESS;
 255         cmdr = cmd->opcode;
 256
 257         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
 258             cmd->opcode == MMC_GO_IDLE_STATE ||
 259             cmd->opcode == MMC_GO_INACTIVE_STATE ||
 260             (cmd->opcode == SD_IO_RW_DIRECT &&
 261              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
 262                 cmdr |= SDMMC_CMD_STOP;
 263         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
 264                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
 265
 266         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
 267                 u32 clk_en_a;
 268
 269                 /* Special bit makes CMD11 not die */
 270                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
 271
 272                 /* Change state to continue to handle CMD11 weirdness */
 273                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
 274                 slot->host->state = STATE_SENDING_CMD11;
 275
 276                 /*
 277                  * We need to disable low power mode (automatic clock stop)
 278                  * while doing voltage switch so we don't confuse the card,
 279                  * since stopping the clock is a specific part of the UHS
 280                  * voltage change dance.
 281                  *
 282                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
 283                  * unconditionally turned back on in dw_mci_setup_bus() if it's
 284                  * ever called with a non-zero clock.  That shouldn't happen
 285                  * until the voltage change is all done.
 286                  */
 287                 clk_en_a = mci_readl(host, CLKENA);
 288                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
 289                 mci_writel(host, CLKENA, clk_en_a);
 290                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
 291                              SDMMC_CMD_PRV_DAT_WAIT, 0);
 292         }
 293
 294         if (cmd->flags & MMC_RSP_PRESENT) {
 295                 /* We expect a response, so set this bit */
 296                 cmdr |= SDMMC_CMD_RESP_EXP;
 297                 if (cmd->flags & MMC_RSP_136)
 298                         cmdr |= SDMMC_CMD_RESP_LONG;
 299         }
 300
 301         if (cmd->flags & MMC_RSP_CRC)
 302                 cmdr |= SDMMC_CMD_RESP_CRC;
 303
 304         if (cmd->data) {
 305                 cmdr |= SDMMC_CMD_DAT_EXP;
 306                 if (cmd->data->flags & MMC_DATA_WRITE)
 307                         cmdr |= SDMMC_CMD_DAT_WR;
 308         }
 309
 310         if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags))
 311                 cmdr |= SDMMC_CMD_USE_HOLD_REG;
 312
 313         return cmdr;
 314 }
 315
 316 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
 317 {
 318         struct mmc_command *stop;
 319         u32 cmdr;
 320
 321         if (!cmd->data)
 322                 return 0;
 323
 324         stop = &host->stop_abort;
 325         cmdr = cmd->opcode;
 326         memset(stop, 0, sizeof(struct mmc_command));
 327
 328         if (cmdr == MMC_READ_SINGLE_BLOCK ||
 329             cmdr == MMC_READ_MULTIPLE_BLOCK ||
 330             cmdr == MMC_WRITE_BLOCK ||
 331             cmdr == MMC_WRITE_MULTIPLE_BLOCK ||
 332             cmdr == MMC_SEND_TUNING_BLOCK ||
 333             cmdr == MMC_SEND_TUNING_BLOCK_HS200) {
 334                 stop->opcode = MMC_STOP_TRANSMISSION;
 335                 stop->arg = 0;
 336                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
 337         } else if (cmdr == SD_IO_RW_EXTENDED) {
 338                 stop->opcode = SD_IO_RW_DIRECT;
 339                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
 340                              ((cmd->arg >> 28) & 0x7);
 341                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
 342         } else {
 343                 return 0;
 344         }
 345
 346         cmdr = stop->opcode | SDMMC_CMD_STOP |
 347                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
 348
 349         if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &host->slot->flags))
 350                 cmdr |= SDMMC_CMD_USE_HOLD_REG;
 351
 352         return cmdr;
 353 }
 354
 355 static inline void dw_mci_set_cto(struct dw_mci *host)
 356 {
 357         unsigned int cto_clks;
 358         unsigned int cto_div;
 359         unsigned int cto_ms;
 360         unsigned long irqflags;
 361
 362         cto_clks = mci_readl(host, TMOUT) & 0xff;
 363         cto_div = (mci_readl(host, CLKDIV) & 0xff) * 2;
 364         if (cto_div == 0)
 365                 cto_div = 1;
 366
 367         cto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * cto_clks * cto_div,
 368                                   host->bus_hz);
 369
 370         /* add a bit spare time */
 371         cto_ms += 10;
 372
 373         /*
 374          * The durations we're working with are fairly short so we have to be
 375          * extra careful about synchronization here.  Specifically in hardware a
 376          * command timeout is _at most_ 5.1 ms, so that means we expect an
 377          * interrupt (either command done or timeout) to come rather quickly
 378          * after the mci_writel.  ...but just in case we have a long interrupt
 379          * latency let's add a bit of paranoia.
 380          *
 381          * In general we'll assume that at least an interrupt will be asserted
 382          * in hardware by the time the cto_timer runs.  ...and if it hasn't
 383          * been asserted in hardware by that time then we'll assume it'll never
 384          * come.
 385          */
 386         spin_lock_irqsave(&host->irq_lock, irqflags);
 387         if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
 388                 mod_timer(&host->cto_timer,
 389                         jiffies + msecs_to_jiffies(cto_ms) + 1);
 390         spin_unlock_irqrestore(&host->irq_lock, irqflags);
 391 }
 392
 393 static void dw_mci_start_command(struct dw_mci *host,
 394                                  struct mmc_command *cmd, u32 cmd_flags)
 395 {
 396         host->cmd = cmd;
 397         dev_vdbg(host->dev,
 398                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
 399                  cmd->arg, cmd_flags);
 400
 401         mci_writel(host, CMDARG, cmd->arg);
 402         wmb(); /* drain writebuffer */
 403         dw_mci_wait_while_busy(host, cmd_flags);
 404
 405         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
 406
 407         /* response expected command only */
 408         if (cmd_flags & SDMMC_CMD_RESP_EXP)
 409                 dw_mci_set_cto(host);
 410 }
 411
 412 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
 413 {
 414         struct mmc_command *stop = &host->stop_abort;
 415
 416         dw_mci_start_command(host, stop, host->stop_cmdr);
 417 }
 418
 419 /* DMA interface functions */
 420 static void dw_mci_stop_dma(struct dw_mci *host)
 421 {
 422         if (host->using_dma) {
 423                 host->dma_ops->stop(host);
 424                 host->dma_ops->cleanup(host);
 425         }
 426
 427         /* Data transfer was stopped by the interrupt handler */
 428         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
 429 }
 430
 431 static void dw_mci_dma_cleanup(struct dw_mci *host)
 432 {
 433         struct mmc_data *data = host->data;
 434
 435         if (data && data->host_cookie == COOKIE_MAPPED) {
 436                 dma_unmap_sg(host->dev,
 437                              data->sg,
 438                              data->sg_len,
 439                              mmc_get_dma_dir(data));
 440                 data->host_cookie = COOKIE_UNMAPPED;
 441         }
 442 }
 443
 444 static void dw_mci_idmac_reset(struct dw_mci *host)
 445 {
 446         u32 bmod = mci_readl(host, BMOD);
 447         /* Software reset of DMA */
 448         bmod |= SDMMC_IDMAC_SWRESET;
 449         mci_writel(host, BMOD, bmod);
 450 }
 451
 452 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
 453 {
 454         u32 temp;
 455
 456         /* Disable and reset the IDMAC interface */
 457         temp = mci_readl(host, CTRL);
 458         temp &= ~SDMMC_CTRL_USE_IDMAC;
 459         temp |= SDMMC_CTRL_DMA_RESET;
 460         mci_writel(host, CTRL, temp);
 461
 462         /* Stop the IDMAC running */
 463         temp = mci_readl(host, BMOD);
 464         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
 465         temp |= SDMMC_IDMAC_SWRESET;
 466         mci_writel(host, BMOD, temp);
 467 }
 468
 469 static void dw_mci_dmac_complete_dma(void *arg)
 470 {
 471         struct dw_mci *host = arg;
 472         struct mmc_data *data = host->data;
 473
 474         dev_vdbg(host->dev, "DMA complete\n");
 475
 476         if ((host->use_dma == TRANS_MODE_EDMAC) &&
 477             data && (data->flags & MMC_DATA_READ))
 478                 /* Invalidate cache after read */
 479                 dma_sync_sg_for_cpu(mmc_dev(host->slot->mmc),
 480                                     data->sg,
 481                                     data->sg_len,
 482                                     DMA_FROM_DEVICE);
 483
 484         host->dma_ops->cleanup(host);
 485
 486         /*
 487          * If the card was removed, data will be NULL. No point in trying to
 488          * send the stop command or waiting for NBUSY in this case.
 489          */
 490         if (data) {
 491                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
 492                 tasklet_schedule(&host->tasklet);
 493         }
 494 }
 495
 496 static int dw_mci_idmac_init(struct dw_mci *host)
 497 {
 498         int i;
 499
 500         if (host->dma_64bit_address == 1) {
 501                 struct idmac_desc_64addr *p;
 502                 /* Number of descriptors in the ring buffer */
 503                 host->ring_size =
 504                         DESC_RING_BUF_SZ / sizeof(struct idmac_desc_64addr);
 505
 506                 /* Forward link the descriptor list */
 507                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
 508                                                                 i++, p++) {
 509                         p->des6 = (host->sg_dma +
 510                                         (sizeof(struct idmac_desc_64addr) *
 511                                                         (i + 1))) & 0xffffffff;
 512
 513                         p->des7 = (u64)(host->sg_dma +
 514                                         (sizeof(struct idmac_desc_64addr) *
 515                                                         (i + 1))) >> 32;
 516                         /* Initialize reserved and buffer size fields to "0" */
 517                         p->des0 = 0;
 518                         p->des1 = 0;
 519                         p->des2 = 0;
 520                         p->des3 = 0;
 521                 }
 522
 523                 /* Set the last descriptor as the end-of-ring descriptor */
 524                 p->des6 = host->sg_dma & 0xffffffff;
 525                 p->des7 = (u64)host->sg_dma >> 32;
 526                 p->des0 = IDMAC_DES0_ER;
 527
 528         } else {
 529                 struct idmac_desc *p;
 530                 /* Number of descriptors in the ring buffer */
 531                 host->ring_size =
 532                         DESC_RING_BUF_SZ / sizeof(struct idmac_desc);
 533
 534                 /* Forward link the descriptor list */
 535                 for (i = 0, p = host->sg_cpu;
 536                      i < host->ring_size - 1;
 537                      i++, p++) {
 538                         p->des3 = cpu_to_le32(host->sg_dma +
 539                                         (sizeof(struct idmac_desc) * (i + 1)));
 540                         p->des0 = 0;
 541                         p->des1 = 0;
 542                 }
 543
 544                 /* Set the last descriptor as the end-of-ring descriptor */
 545                 p->des3 = cpu_to_le32(host->sg_dma);
 546                 p->des0 = cpu_to_le32(IDMAC_DES0_ER);
 547         }
 548
 549         dw_mci_idmac_reset(host);
 550
 551         if (host->dma_64bit_address == 1) {
 552                 /* Mask out interrupts - get Tx & Rx complete only */
 553                 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
 554                 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
 555                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
 556
 557                 /* Set the descriptor base address */
 558                 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
 559                 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
 560
 561         } else {
 562                 /* Mask out interrupts - get Tx & Rx complete only */
 563                 mci_writel(host, IDSTS, IDMAC_INT_CLR);
 564                 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
 565                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
 566
 567                 /* Set the descriptor base address */
 568                 mci_writel(host, DBADDR, host->sg_dma);
 569         }
 570
 571         return 0;
 572 }
 573
 574 static inline int dw_mci_prepare_desc64(struct dw_mci *host,
 575                                          struct mmc_data *data,
 576                                          unsigned int sg_len)
 577 {
 578         unsigned int desc_len;
 579         struct idmac_desc_64addr *desc_first, *desc_last, *desc;
 580         u32 val;
 581         int i;
 582
 583         desc_first = desc_last = desc = host->sg_cpu;
 584
 585         for (i = 0; i < sg_len; i++) {
 586                 unsigned int length = sg_dma_len(&data->sg[i]);
 587
 588                 u64 mem_addr = sg_dma_address(&data->sg[i]);
 589
 590                 for ( ; length ; desc++) {
 591                         desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
 592                                    length : DW_MCI_DESC_DATA_LENGTH;
 593
 594                         length -= desc_len;
 595
 596                         /*
 597                          * Wait for the former clear OWN bit operation
 598                          * of IDMAC to make sure that this descriptor
 599                          * isn't still owned by IDMAC as IDMAC's write
 600                          * ops and CPU's read ops are asynchronous.
 601                          */
 602                         if (readl_poll_timeout_atomic(&desc->des0, val,
 603                                                 !(val & IDMAC_DES0_OWN),
 604                                                 10, 100 * USEC_PER_MSEC))
 605                                 goto err_own_bit;
 606
 607                         /*
 608                          * Set the OWN bit and disable interrupts
 609                          * for this descriptor
 610                          */
 611                         desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
 612                                                 IDMAC_DES0_CH;
 613
 614                         /* Buffer length */
 615                         IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len);
 616
 617                         /* Physical address to DMA to/from */
 618                         desc->des4 = mem_addr & 0xffffffff;
 619                         desc->des5 = mem_addr >> 32;
 620
 621                         /* Update physical address for the next desc */
 622                         mem_addr += desc_len;
 623
 624                         /* Save pointer to the last descriptor */
 625                         desc_last = desc;
 626                 }
 627         }
 628
 629         /* Set first descriptor */
 630         desc_first->des0 |= IDMAC_DES0_FD;
 631
 632         /* Set last descriptor */
 633         desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
 634         desc_last->des0 |= IDMAC_DES0_LD;
 635
 636         return 0;
 637 err_own_bit:
 638         /* restore the descriptor chain as it's polluted */
 639         dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n");
 640         memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
 641         dw_mci_idmac_init(host);
 642         return -EINVAL;
 643 }
 644
 645
 646 static inline int dw_mci_prepare_desc32(struct dw_mci *host,
 647                                          struct mmc_data *data,
 648                                          unsigned int sg_len)
 649 {
 650         unsigned int desc_len;
 651         struct idmac_desc *desc_first, *desc_last, *desc;
 652         u32 val;
 653         int i;
 654
 655         desc_first = desc_last = desc = host->sg_cpu;
 656
 657         for (i = 0; i < sg_len; i++) {
 658                 unsigned int length = sg_dma_len(&data->sg[i]);
 659
 660                 u32 mem_addr = sg_dma_address(&data->sg[i]);
 661
 662                 for ( ; length ; desc++) {
 663                         desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
 664                                    length : DW_MCI_DESC_DATA_LENGTH;
 665
 666                         length -= desc_len;
 667
 668                         /*
 669                          * Wait for the former clear OWN bit operation
 670                          * of IDMAC to make sure that this descriptor
 671                          * isn't still owned by IDMAC as IDMAC's write
 672                          * ops and CPU's read ops are asynchronous.
 673                          */
 674                         if (readl_poll_timeout_atomic(&desc->des0, val,
 675                                                       IDMAC_OWN_CLR64(val),
 676                                                       10,
 677                                                       100 * USEC_PER_MSEC))
 678                                 goto err_own_bit;
 679
 680                         /*
 681                          * Set the OWN bit and disable interrupts
 682                          * for this descriptor
 683                          */
 684                         desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
 685                                                  IDMAC_DES0_DIC |
 686                                                  IDMAC_DES0_CH);
 687
 688                         /* Buffer length */
 689                         IDMAC_SET_BUFFER1_SIZE(desc, desc_len);
 690
 691                         /* Physical address to DMA to/from */
 692                         desc->des2 = cpu_to_le32(mem_addr);
 693
 694                         /* Update physical address for the next desc */
 695                         mem_addr += desc_len;
 696
 697                         /* Save pointer to the last descriptor */
 698                         desc_last = desc;
 699                 }
 700         }
 701
 702         /* Set first descriptor */
 703         desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD);
 704
 705         /* Set last descriptor */
 706         desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
 707                                        IDMAC_DES0_DIC));
 708         desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
 709
 710         return 0;
 711 err_own_bit:
 712         /* restore the descriptor chain as it's polluted */
 713         dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n");
 714         memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
 715         dw_mci_idmac_init(host);
 716         return -EINVAL;
 717 }
 718
 719 static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
 720 {
 721         u32 temp;
 722         int ret;
 723
 724         if (host->dma_64bit_address == 1)
 725                 ret = dw_mci_prepare_desc64(host, host->data, sg_len);
 726         else
 727                 ret = dw_mci_prepare_desc32(host, host->data, sg_len);
 728
 729         if (ret)
 730                 goto out;
 731
 732         /* drain writebuffer */
 733         wmb();
 734
 735         /* Make sure to reset DMA in case we did PIO before this */
 736         dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
 737         dw_mci_idmac_reset(host);
 738
 739         /* Select IDMAC interface */
 740         temp = mci_readl(host, CTRL);
 741         temp |= SDMMC_CTRL_USE_IDMAC;
 742         mci_writel(host, CTRL, temp);
 743
 744         /* drain writebuffer */
 745         wmb();
 746
 747         /* Enable the IDMAC */
 748         temp = mci_readl(host, BMOD);
 749         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
 750         mci_writel(host, BMOD, temp);
 751
 752         /* Start it running */
 753         mci_writel(host, PLDMND, 1);
 754
 755 out:
 756         return ret;
 757 }
 758
 759 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
 760         .init = dw_mci_idmac_init,
 761         .start = dw_mci_idmac_start_dma,
 762         .stop = dw_mci_idmac_stop_dma,
 763         .complete = dw_mci_dmac_complete_dma,
 764         .cleanup = dw_mci_dma_cleanup,
 765 };
 766
 767 static void dw_mci_edmac_stop_dma(struct dw_mci *host)
 768 {
 769         dmaengine_terminate_async(host->dms->ch);
 770 }
 771
 772 static int dw_mci_edmac_start_dma(struct dw_mci *host,
 773                                             unsigned int sg_len)
 774 {
 775         struct dma_slave_config cfg;
 776         struct dma_async_tx_descriptor *desc = NULL;
 777         struct scatterlist *sgl = host->data->sg;
 778         static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
 779         u32 sg_elems = host->data->sg_len;
 780         u32 fifoth_val;
 781         u32 fifo_offset = host->fifo_reg - host->regs;
 782         int ret = 0;
 783
 784         /* Set external dma config: burst size, burst width */
 785         cfg.dst_addr = host->phy_regs + fifo_offset;
 786         cfg.src_addr = cfg.dst_addr;
 787         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 788         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 789
 790         /* Match burst msize with external dma config */
 791         fifoth_val = mci_readl(host, FIFOTH);
 792         cfg.dst_maxburst = mszs[(fifoth_val >> 28) & 0x7];
 793         cfg.src_maxburst = cfg.dst_maxburst;
 794
 795         if (host->data->flags & MMC_DATA_WRITE)
 796                 cfg.direction = DMA_MEM_TO_DEV;
 797         else
 798                 cfg.direction = DMA_DEV_TO_MEM;
 799
 800         ret = dmaengine_slave_config(host->dms->ch, &cfg);
 801         if (ret) {
 802                 dev_err(host->dev, "Failed to config edmac.\n");
 803                 return -EBUSY;
 804         }
 805
 806         desc = dmaengine_prep_slave_sg(host->dms->ch, sgl,
 807                                        sg_len, cfg.direction,
 808                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 809         if (!desc) {
 810                 dev_err(host->dev, "Can't prepare slave sg.\n");
 811                 return -EBUSY;
 812         }
 813
 814         /* Set dw_mci_dmac_complete_dma as callback */
 815         desc->callback = dw_mci_dmac_complete_dma;
 816         desc->callback_param = (void *)host;
 817         dmaengine_submit(desc);
 818
 819         /* Flush cache before write */
 820         if (host->data->flags & MMC_DATA_WRITE)
 821                 dma_sync_sg_for_device(mmc_dev(host->slot->mmc), sgl,
 822                                        sg_elems, DMA_TO_DEVICE);
 823
 824         dma_async_issue_pending(host->dms->ch);
 825
 826         return 0;
 827 }
 828
 829 static int dw_mci_edmac_init(struct dw_mci *host)
 830 {
 831         /* Request external dma channel */
 832         host->dms = kzalloc(sizeof(struct dw_mci_dma_slave), GFP_KERNEL);
 833         if (!host->dms)
 834                 return -ENOMEM;
 835
 836         host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
 837         if (!host->dms->ch) {
 838                 dev_err(host->dev, "Failed to get external DMA channel.\n");
 839                 kfree(host->dms);
 840                 host->dms = NULL;
 841                 return -ENXIO;
 842         }
 843
 844         return 0;
 845 }
 846
 847 static void dw_mci_edmac_exit(struct dw_mci *host)
 848 {
 849         if (host->dms) {
 850                 if (host->dms->ch) {
 851                         dma_release_channel(host->dms->ch);
 852                         host->dms->ch = NULL;
 853                 }
 854                 kfree(host->dms);
 855                 host->dms = NULL;
 856         }
 857 }
 858
 859 static const struct dw_mci_dma_ops dw_mci_edmac_ops = {
 860         .init = dw_mci_edmac_init,
 861         .exit = dw_mci_edmac_exit,
 862         .start = dw_mci_edmac_start_dma,
 863         .stop = dw_mci_edmac_stop_dma,
 864         .complete = dw_mci_dmac_complete_dma,
 865         .cleanup = dw_mci_dma_cleanup,
 866 };
 867
 868 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
 869                                    struct mmc_data *data,
 870                                    int cookie)
 871 {
 872         struct scatterlist *sg;
 873         unsigned int i, sg_len;
 874
 875         if (data->host_cookie == COOKIE_PRE_MAPPED)
 876                 return data->sg_len;
 877
 878         /*
 879          * We don't do DMA on "complex" transfers, i.e. with
 880          * non-word-aligned buffers or lengths. Also, we don't bother
 881          * with all the DMA setup overhead for short transfers.
 882          */
 883         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
 884                 return -EINVAL;
 885
 886         if (data->blksz & 3)
 887                 return -EINVAL;
 888
 889         for_each_sg(data->sg, sg, data->sg_len, i) {
 890                 if (sg->offset & 3 || sg->length & 3)
 891                         return -EINVAL;
 892         }
 893
 894         sg_len = dma_map_sg(host->dev,
 895                             data->sg,
 896                             data->sg_len,
 897                             mmc_get_dma_dir(data));
 898         if (sg_len == 0)
 899                 return -EINVAL;
 900
 901         data->host_cookie = cookie;
 902
 903         return sg_len;
 904 }
 905
 906 static void dw_mci_pre_req(struct mmc_host *mmc,
 907                            struct mmc_request *mrq)
 908 {
 909         struct dw_mci_slot *slot = mmc_priv(mmc);
 910         struct mmc_data *data = mrq->data;
 911
 912         if (!slot->host->use_dma || !data)
 913                 return;
 914
 915         /* This data might be unmapped at this time */
 916         data->host_cookie = COOKIE_UNMAPPED;
 917
 918         if (dw_mci_pre_dma_transfer(slot->host, mrq->data,
 919                                 COOKIE_PRE_MAPPED) < 0)
 920                 data->host_cookie = COOKIE_UNMAPPED;
 921 }
 922
 923 static void dw_mci_post_req(struct mmc_host *mmc,
 924                             struct mmc_request *mrq,
 925                             int err)
 926 {
 927         struct dw_mci_slot *slot = mmc_priv(mmc);
 928         struct mmc_data *data = mrq->data;
 929
 930         if (!slot->host->use_dma || !data)
 931                 return;
 932
 933         if (data->host_cookie != COOKIE_UNMAPPED)
 934                 dma_unmap_sg(slot->host->dev,
 935                              data->sg,
 936                              data->sg_len,
 937                              mmc_get_dma_dir(data));
 938         data->host_cookie = COOKIE_UNMAPPED;
 939 }
 940
 941 static int dw_mci_get_cd(struct mmc_host *mmc)
 942 {
 943         int present;
 944         struct dw_mci_slot *slot = mmc_priv(mmc);
 945         struct dw_mci *host = slot->host;
 946         int gpio_cd = mmc_gpio_get_cd(mmc);
 947
 948         /* Use platform get_cd function, else try onboard card detect */
 949         if (((mmc->caps & MMC_CAP_NEEDS_POLL)
 950                                 || !mmc_card_is_removable(mmc))) {
 951                 present = 1;
 952
 953                 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
 954                         if (mmc->caps & MMC_CAP_NEEDS_POLL) {
 955                                 dev_info(&mmc->class_dev,
 956                                         "card is polling.\n");
 957                         } else {
 958                                 dev_info(&mmc->class_dev,
 959                                         "card is non-removable.\n");
 960                         }
 961                         set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
 962                 }
 963
 964                 return present;
 965         } else if (gpio_cd >= 0)
 966                 present = gpio_cd;
 967         else
 968                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
 969                         == 0 ? 1 : 0;
 970
 971         spin_lock_bh(&host->lock);
 972         if (present && !test_and_set_bit(DW_MMC_CARD_PRESENT, &slot->flags))
 973                 dev_dbg(&mmc->class_dev, "card is present\n");
 974         else if (!present &&
 975                         !test_and_clear_bit(DW_MMC_CARD_PRESENT, &slot->flags))
 976                 dev_dbg(&mmc->class_dev, "card is not present\n");
 977         spin_unlock_bh(&host->lock);
 978
 979         return present;
 980 }
 981
 982 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
 983 {
 984         unsigned int blksz = data->blksz;
 985         static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
 986         u32 fifo_width = 1 << host->data_shift;
 987         u32 blksz_depth = blksz / fifo_width, fifoth_val;
 988         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
 989         int idx = ARRAY_SIZE(mszs) - 1;
 990
 991         /* pio should ship this scenario */
 992         if (!host->use_dma)
 993                 return;
 994
 995         tx_wmark = (host->fifo_depth) / 2;
 996         tx_wmark_invers = host->fifo_depth - tx_wmark;
 997
 998         /*
 999          * MSIZE is '1',
1000          * if blksz is not a multiple of the FIFO width
1001          */
1002         if (blksz % fifo_width)
1003                 goto done;
1004
1005         do {
1006                 if (!((blksz_depth % mszs[idx]) ||
1007                      (tx_wmark_invers % mszs[idx]))) {
1008                         msize = idx;
1009                         rx_wmark = mszs[idx] - 1;
1010                         break;
1011                 }
1012         } while (--idx > 0);
1013         /*
1014          * If idx is '0', it won't be tried
1015          * Thus, initial values are uesed
1016          */
1017 done:
1018         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
1019         mci_writel(host, FIFOTH, fifoth_val);
1020 }
1021
1022 static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data)
1023 {
1024         unsigned int blksz = data->blksz;
1025         u32 blksz_depth, fifo_depth;
1026         u16 thld_size;
1027         u8 enable;
1028
1029         /*
1030          * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
1031          * in the FIFO region, so we really shouldn't access it).
1032          */
1033         if (host->verid < DW_MMC_240A ||
1034                 (host->verid < DW_MMC_280A && data->flags & MMC_DATA_WRITE))
1035                 return;
1036
1037         /*
1038          * Card write Threshold is introduced since 2.80a
1039          * It's used when HS400 mode is enabled.
1040          */
1041         if (data->flags & MMC_DATA_WRITE &&
1042                 host->timing != MMC_TIMING_MMC_HS400)
1043                 goto disable;
1044
1045         if (data->flags & MMC_DATA_WRITE)
1046                 enable = SDMMC_CARD_WR_THR_EN;
1047         else
1048                 enable = SDMMC_CARD_RD_THR_EN;
1049
1050         if (host->timing != MMC_TIMING_MMC_HS200 &&
1051             host->timing != MMC_TIMING_UHS_SDR104 &&
1052             host->timing != MMC_TIMING_MMC_HS400)
1053                 goto disable;
1054
1055         blksz_depth = blksz / (1 << host->data_shift);
1056         fifo_depth = host->fifo_depth;
1057
1058         if (blksz_depth > fifo_depth)
1059                 goto disable;
1060
1061         /*
1062          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
1063          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
1064          * Currently just choose blksz.
1065          */
1066         thld_size = blksz;
1067         mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(thld_size, enable));
1068         return;
1069
1070 disable:
1071         mci_writel(host, CDTHRCTL, 0);
1072 }
1073
1074 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
1075 {
1076         unsigned long irqflags;
1077         int sg_len;
1078         u32 temp;
1079
1080         host->using_dma = 0;
1081
1082         /* If we don't have a channel, we can't do DMA */
1083         if (!host->use_dma)
1084                 return -ENODEV;
1085
1086         sg_len = dw_mci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1087         if (sg_len < 0) {
1088                 host->dma_ops->stop(host);
1089                 return sg_len;
1090         }
1091
1092         host->using_dma = 1;
1093
1094         if (host->use_dma == TRANS_MODE_IDMAC)
1095                 dev_vdbg(host->dev,
1096                          "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
1097                          (unsigned long)host->sg_cpu,
1098                          (unsigned long)host->sg_dma,
1099                          sg_len);
1100
1101         /*
1102          * Decide the MSIZE and RX/TX Watermark.
1103          * If current block size is same with previous size,
1104          * no need to update fifoth.
1105          */
1106         if (host->prev_blksz != data->blksz)
1107                 dw_mci_adjust_fifoth(host, data);
1108
1109         /* Enable the DMA interface */
1110         temp = mci_readl(host, CTRL);
1111         temp |= SDMMC_CTRL_DMA_ENABLE;
1112         mci_writel(host, CTRL, temp);
1113
1114         /* Disable RX/TX IRQs, let DMA handle it */
1115         spin_lock_irqsave(&host->irq_lock, irqflags);
1116         temp = mci_readl(host, INTMASK);
1117         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
1118         mci_writel(host, INTMASK, temp);
1119         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1120
1121         if (host->dma_ops->start(host, sg_len)) {
1122                 host->dma_ops->stop(host);
1123                 /* We can't do DMA, try PIO for this one */
1124                 dev_dbg(host->dev,
1125                         "%s: fall back to PIO mode for current transfer\n",
1126                         __func__);
1127                 return -ENODEV;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
1134 {
1135         unsigned long irqflags;
1136         int flags = SG_MITER_ATOMIC;
1137         u32 temp;
1138
1139         data->error = -EINPROGRESS;
1140
1141         WARN_ON(host->data);
1142         host->sg = NULL;
1143         host->data = data;
1144
1145         if (data->flags & MMC_DATA_READ)
1146                 host->dir_status = DW_MCI_RECV_STATUS;
1147         else
1148                 host->dir_status = DW_MCI_SEND_STATUS;
1149
1150         dw_mci_ctrl_thld(host, data);
1151
1152         if (dw_mci_submit_data_dma(host, data)) {
1153                 if (host->data->flags & MMC_DATA_READ)
1154                         flags |= SG_MITER_TO_SG;
1155                 else
1156                         flags |= SG_MITER_FROM_SG;
1157
1158                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1159                 host->sg = data->sg;
1160                 host->part_buf_start = 0;
1161                 host->part_buf_count = 0;
1162
1163                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
1164
1165                 spin_lock_irqsave(&host->irq_lock, irqflags);
1166                 temp = mci_readl(host, INTMASK);
1167                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
1168                 mci_writel(host, INTMASK, temp);
1169                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1170
1171                 temp = mci_readl(host, CTRL);
1172                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
1173                 mci_writel(host, CTRL, temp);
1174
1175                 /*
1176                  * Use the initial fifoth_val for PIO mode. If wm_algined
1177                  * is set, we set watermark same as data size.
1178                  * If next issued data may be transfered by DMA mode,
1179                  * prev_blksz should be invalidated.
1180                  */
1181                 if (host->wm_aligned)
1182                         dw_mci_adjust_fifoth(host, data);
1183                 else
1184                         mci_writel(host, FIFOTH, host->fifoth_val);
1185                 host->prev_blksz = 0;
1186         } else {
1187                 /*
1188                  * Keep the current block size.
1189                  * It will be used to decide whether to update
1190                  * fifoth register next time.
1191                  */
1192                 host->prev_blksz = data->blksz;
1193         }
1194 }
1195
1196 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
1197 {
1198         struct dw_mci *host = slot->host;
1199         unsigned int clock = slot->clock;
1200         u32 div;
1201         u32 clk_en_a;
1202         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
1203
1204         /* We must continue to set bit 28 in CMD until the change is complete */
1205         if (host->state == STATE_WAITING_CMD11_DONE)
1206                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
1207
1208         slot->mmc->actual_clock = 0;
1209
1210         if (!clock) {
1211                 mci_writel(host, CLKENA, 0);
1212                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1213         } else if (clock != host->current_speed || force_clkinit) {
1214                 div = host->bus_hz / clock;
1215                 if (host->bus_hz % clock && host->bus_hz > clock)
1216                         /*
1217                          * move the + 1 after the divide to prevent
1218                          * over-clocking the card.
1219                          */
1220                         div += 1;
1221
1222                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
1223
1224                 if ((clock != slot->__clk_old &&
1225                         !test_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags)) ||
1226                         force_clkinit) {
1227                         /* Silent the verbose log if calling from PM context */
1228                         if (!force_clkinit)
1229                                 dev_info(&slot->mmc->class_dev,
1230                                          "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
1231                                          slot->id, host->bus_hz, clock,
1232                                          div ? ((host->bus_hz / div) >> 1) :
1233                                          host->bus_hz, div);
1234
1235                         /*
1236                          * If card is polling, display the message only
1237                          * one time at boot time.
1238                          */
1239                         if (slot->mmc->caps & MMC_CAP_NEEDS_POLL &&
1240                                         slot->mmc->f_min == clock)
1241                                 set_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags);
1242                 }
1243
1244                 /* disable clock */
1245                 mci_writel(host, CLKENA, 0);
1246                 mci_writel(host, CLKSRC, 0);
1247
1248                 /* inform CIU */
1249                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1250
1251                 /* set clock to desired speed */
1252                 mci_writel(host, CLKDIV, div);
1253
1254                 /* inform CIU */
1255                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1256
1257                 /* enable clock; only low power if no SDIO */
1258                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
1259                 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags))
1260                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
1261                 mci_writel(host, CLKENA, clk_en_a);
1262
1263                 /* inform CIU */
1264                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1265
1266                 /* keep the last clock value that was requested from core */
1267                 slot->__clk_old = clock;
1268                 slot->mmc->actual_clock = div ? ((host->bus_hz / div) >> 1) :
1269                                           host->bus_hz;
1270         }
1271
1272         host->current_speed = clock;
1273
1274         /* Set the current slot bus width */
1275         mci_writel(host, CTYPE, (slot->ctype << slot->id));
1276 }
1277
1278 static void __dw_mci_start_request(struct dw_mci *host,
1279                                    struct dw_mci_slot *slot,
1280                                    struct mmc_command *cmd)
1281 {
1282         struct mmc_request *mrq;
1283         struct mmc_data *data;
1284         u32 cmdflags;
1285
1286         mrq = slot->mrq;
1287
1288         host->mrq = mrq;
1289
1290         host->pending_events = 0;
1291         host->completed_events = 0;
1292         host->cmd_status = 0;
1293         host->data_status = 0;
1294         host->dir_status = 0;
1295
1296         data = cmd->data;
1297         if (data) {
1298                 mci_writel(host, TMOUT, 0xFFFFFFFF);
1299                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
1300                 mci_writel(host, BLKSIZ, data->blksz);
1301         }
1302
1303         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
1304
1305         /* this is the first command, send the initialization clock */
1306         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
1307                 cmdflags |= SDMMC_CMD_INIT;
1308
1309         if (data) {
1310                 dw_mci_submit_data(host, data);
1311                 wmb(); /* drain writebuffer */
1312         }
1313
1314         dw_mci_start_command(host, cmd, cmdflags);
1315
1316         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
1317                 unsigned long irqflags;
1318
1319                 /*
1320                  * Databook says to fail after 2ms w/ no response, but evidence
1321                  * shows that sometimes the cmd11 interrupt takes over 130ms.
1322                  * We'll set to 500ms, plus an extra jiffy just in case jiffies
1323                  * is just about to roll over.
1324                  *
1325                  * We do this whole thing under spinlock and only if the
1326                  * command hasn't already completed (indicating the the irq
1327                  * already ran so we don't want the timeout).
1328                  */
1329                 spin_lock_irqsave(&host->irq_lock, irqflags);
1330                 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1331                         mod_timer(&host->cmd11_timer,
1332                                 jiffies + msecs_to_jiffies(500) + 1);
1333                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1334         }
1335
1336         host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
1337 }
1338
1339 static void dw_mci_start_request(struct dw_mci *host,
1340                                  struct dw_mci_slot *slot)
1341 {
1342         struct mmc_request *mrq = slot->mrq;
1343         struct mmc_command *cmd;
1344
1345         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
1346         __dw_mci_start_request(host, slot, cmd);
1347 }
1348
1349 /* must be called with host->lock held */
1350 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1351                                  struct mmc_request *mrq)
1352 {
1353         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1354                  host->state);
1355
1356         slot->mrq = mrq;
1357
1358         if (host->state == STATE_WAITING_CMD11_DONE) {
1359                 dev_warn(&slot->mmc->class_dev,
1360                          "Voltage change didn't complete\n");
1361                 /*
1362                  * this case isn't expected to happen, so we can
1363                  * either crash here or just try to continue on
1364                  * in the closest possible state
1365                  */
1366                 host->state = STATE_IDLE;
1367         }
1368
1369         if (host->state == STATE_IDLE) {
1370                 host->state = STATE_SENDING_CMD;
1371                 dw_mci_start_request(host, slot);
1372         } else {
1373                 list_add_tail(&slot->queue_node, &host->queue);
1374         }
1375 }
1376
1377 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1378 {
1379         struct dw_mci_slot *slot = mmc_priv(mmc);
1380         struct dw_mci *host = slot->host;
1381
1382         WARN_ON(slot->mrq);
1383
1384         /*
1385          * The check for card presence and queueing of the request must be
1386          * atomic, otherwise the card could be removed in between and the
1387          * request wouldn't fail until another card was inserted.
1388          */
1389
1390         if (!dw_mci_get_cd(mmc)) {
1391                 mrq->cmd->error = -ENOMEDIUM;
1392                 mmc_request_done(mmc, mrq);
1393                 return;
1394         }
1395
1396         spin_lock_bh(&host->lock);
1397
1398         dw_mci_queue_request(host, slot, mrq);
1399
1400         spin_unlock_bh(&host->lock);
1401 }
1402
1403 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1404 {
1405         struct dw_mci_slot *slot = mmc_priv(mmc);
1406         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1407         u32 regs;
1408         int ret;
1409
1410         switch (ios->bus_width) {
1411         case MMC_BUS_WIDTH_4:
1412                 slot->ctype = SDMMC_CTYPE_4BIT;
1413                 break;
1414         case MMC_BUS_WIDTH_8:
1415                 slot->ctype = SDMMC_CTYPE_8BIT;
1416                 break;
1417         default:
1418                 /* set default 1 bit mode */
1419                 slot->ctype = SDMMC_CTYPE_1BIT;
1420         }
1421
1422         regs = mci_readl(slot->host, UHS_REG);
1423
1424         /* DDR mode set */
1425         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
1426             ios->timing == MMC_TIMING_UHS_DDR50 ||
1427             ios->timing == MMC_TIMING_MMC_HS400)
1428                 regs |= ((0x1 << slot->id) << 16);
1429         else
1430                 regs &= ~((0x1 << slot->id) << 16);
1431
1432         mci_writel(slot->host, UHS_REG, regs);
1433         slot->host->timing = ios->timing;
1434
1435         /*
1436          * Use mirror of ios->clock to prevent race with mmc
1437          * core ios update when finding the minimum.
1438          */
1439         slot->clock = ios->clock;
1440
1441         if (drv_data && drv_data->set_ios)
1442                 drv_data->set_ios(slot->host, ios);
1443
1444         switch (ios->power_mode) {
1445         case MMC_POWER_UP:
1446                 if (!IS_ERR(mmc->supply.vmmc)) {
1447                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1448                                         ios->vdd);
1449                         if (ret) {
1450                                 dev_err(slot->host->dev,
1451                                         "failed to enable vmmc regulator\n");
1452                                 /*return, if failed turn on vmmc*/
1453                                 return;
1454                         }
1455                 }
1456                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1457                 regs = mci_readl(slot->host, PWREN);
1458                 regs |= (1 << slot->id);
1459                 mci_writel(slot->host, PWREN, regs);
1460                 break;
1461         case MMC_POWER_ON:
1462                 if (!slot->host->vqmmc_enabled) {
1463                         if (!IS_ERR(mmc->supply.vqmmc)) {
1464                                 ret = regulator_enable(mmc->supply.vqmmc);
1465                                 if (ret < 0)
1466                                         dev_err(slot->host->dev,
1467                                                 "failed to enable vqmmc\n");
1468                                 else
1469                                         slot->host->vqmmc_enabled = true;
1470
1471                         } else {
1472                                 /* Keep track so we don't reset again */
1473                                 slot->host->vqmmc_enabled = true;
1474                         }
1475
1476                         /* Reset our state machine after powering on */
1477                         dw_mci_ctrl_reset(slot->host,
1478                                           SDMMC_CTRL_ALL_RESET_FLAGS);
1479                 }
1480
1481                 /* Adjust clock / bus width after power is up */
1482                 dw_mci_setup_bus(slot, false);
1483
1484                 break;
1485         case MMC_POWER_OFF:
1486                 /* Turn clock off before power goes down */
1487                 dw_mci_setup_bus(slot, false);
1488
1489                 if (!IS_ERR(mmc->supply.vmmc))
1490                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1491
1492                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled)
1493                         regulator_disable(mmc->supply.vqmmc);
1494                 slot->host->vqmmc_enabled = false;
1495
1496                 regs = mci_readl(slot->host, PWREN);
1497                 regs &= ~(1 << slot->id);
1498                 mci_writel(slot->host, PWREN, regs);
1499                 break;
1500         default:
1501                 break;
1502         }
1503
1504         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1505                 slot->host->state = STATE_IDLE;
1506 }
1507
1508 static int dw_mci_card_busy(struct mmc_host *mmc)
1509 {
1510         struct dw_mci_slot *slot = mmc_priv(mmc);
1511         u32 status;
1512
1513         /*
1514          * Check the busy bit which is low when DAT[3:0]
1515          * (the data lines) are 0000
1516          */
1517         status = mci_readl(slot->host, STATUS);
1518
1519         return !!(status & SDMMC_STATUS_BUSY);
1520 }
1521
1522 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1523 {
1524         struct dw_mci_slot *slot = mmc_priv(mmc);
1525         struct dw_mci *host = slot->host;
1526         const struct dw_mci_drv_data *drv_data = host->drv_data;
1527         u32 uhs;
1528         u32 v18 = SDMMC_UHS_18V << slot->id;
1529         int ret;
1530
1531         if (drv_data && drv_data->switch_voltage)
1532                 return drv_data->switch_voltage(mmc, ios);
1533
1534         /*
1535          * Program the voltage.  Note that some instances of dw_mmc may use
1536          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1537          * does no harm but you need to set the regulator directly.  Try both.
1538          */
1539         uhs = mci_readl(host, UHS_REG);
1540         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1541                 uhs &= ~v18;
1542         else
1543                 uhs |= v18;
1544
1545         if (!IS_ERR(mmc->supply.vqmmc)) {
1546                 ret = mmc_regulator_set_vqmmc(mmc, ios);
1547
1548                 if (ret) {
1549                         dev_dbg(&mmc->class_dev,
1550                                          "Regulator set error %d - %s V\n",
1551                                          ret, uhs & v18 ? "1.8" : "3.3");
1552                         return ret;
1553                 }
1554         }
1555         mci_writel(host, UHS_REG, uhs);
1556
1557         return 0;
1558 }
1559
1560 static int dw_mci_get_ro(struct mmc_host *mmc)
1561 {
1562         int read_only;
1563         struct dw_mci_slot *slot = mmc_priv(mmc);
1564         int gpio_ro = mmc_gpio_get_ro(mmc);
1565
1566         /* Use platform get_ro function, else try on board write protect */
1567         if (gpio_ro >= 0)
1568                 read_only = gpio_ro;
1569         else
1570                 read_only =
1571                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1572
1573         dev_dbg(&mmc->class_dev, "card is %s\n",
1574                 read_only ? "read-only" : "read-write");
1575
1576         return read_only;
1577 }
1578
1579 static void dw_mci_hw_reset(struct mmc_host *mmc)
1580 {
1581         struct dw_mci_slot *slot = mmc_priv(mmc);
1582         struct dw_mci *host = slot->host;
1583         int reset;
1584
1585         if (host->use_dma == TRANS_MODE_IDMAC)
1586                 dw_mci_idmac_reset(host);
1587
1588         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET |
1589                                      SDMMC_CTRL_FIFO_RESET))
1590                 return;
1591
1592         /*
1593          * According to eMMC spec, card reset procedure:
1594          * tRstW >= 1us:   RST_n pulse width
1595          * tRSCA >= 200us: RST_n to Command time
1596          * tRSTH >= 1us:   RST_n high period
1597          */
1598         reset = mci_readl(host, RST_N);
1599         reset &= ~(SDMMC_RST_HWACTIVE << slot->id);
1600         mci_writel(host, RST_N, reset);
1601         usleep_range(1, 2);
1602         reset |= SDMMC_RST_HWACTIVE << slot->id;
1603         mci_writel(host, RST_N, reset);
1604         usleep_range(200, 300);
1605 }
1606
1607 static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
1608 {
1609         struct dw_mci_slot *slot = mmc_priv(mmc);
1610         struct dw_mci *host = slot->host;
1611
1612         /*
1613          * Low power mode will stop the card clock when idle.  According to the
1614          * description of the CLKENA register we should disable low power mode
1615          * for SDIO cards if we need SDIO interrupts to work.
1616          */
1617         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1618                 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1619                 u32 clk_en_a_old;
1620                 u32 clk_en_a;
1621
1622                 clk_en_a_old = mci_readl(host, CLKENA);
1623
1624                 if (card->type == MMC_TYPE_SDIO ||
1625                     card->type == MMC_TYPE_SD_COMBO) {
1626                         set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1627                         clk_en_a = clk_en_a_old & ~clken_low_pwr;
1628                 } else {
1629                         clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1630                         clk_en_a = clk_en_a_old | clken_low_pwr;
1631                 }
1632
1633                 if (clk_en_a != clk_en_a_old) {
1634                         mci_writel(host, CLKENA, clk_en_a);
1635                         mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1636                                      SDMMC_CMD_PRV_DAT_WAIT, 0);
1637                 }
1638         }
1639 }
1640
1641 static void __dw_mci_enable_sdio_irq(struct dw_mci_slot *slot, int enb)
1642 {
1643         struct dw_mci *host = slot->host;
1644         unsigned long irqflags;
1645         u32 int_mask;
1646
1647         spin_lock_irqsave(&host->irq_lock, irqflags);
1648
1649         /* Enable/disable Slot Specific SDIO interrupt */
1650         int_mask = mci_readl(host, INTMASK);
1651         if (enb)
1652                 int_mask |= SDMMC_INT_SDIO(slot->sdio_id);
1653         else
1654                 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
1655         mci_writel(host, INTMASK, int_mask);
1656
1657         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1658 }
1659
1660 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1661 {
1662         struct dw_mci_slot *slot = mmc_priv(mmc);
1663         struct dw_mci *host = slot->host;
1664
1665         __dw_mci_enable_sdio_irq(slot, enb);
1666
1667         /* Avoid runtime suspending the device when SDIO IRQ is enabled */
1668         if (enb)
1669                 pm_runtime_get_noresume(host->dev);
1670         else
1671                 pm_runtime_put_noidle(host->dev);
1672 }
1673
1674 static void dw_mci_ack_sdio_irq(struct mmc_host *mmc)
1675 {
1676         struct dw_mci_slot *slot = mmc_priv(mmc);
1677
1678         __dw_mci_enable_sdio_irq(slot, 1);
1679 }
1680
1681 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1682 {
1683         struct dw_mci_slot *slot = mmc_priv(mmc);
1684         struct dw_mci *host = slot->host;
1685         const struct dw_mci_drv_data *drv_data = host->drv_data;
1686         int err = -EINVAL;
1687
1688         if (drv_data && drv_data->execute_tuning)
1689                 err = drv_data->execute_tuning(slot, opcode);
1690         return err;
1691 }
1692
1693 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc,
1694                                        struct mmc_ios *ios)
1695 {
1696         struct dw_mci_slot *slot = mmc_priv(mmc);
1697         struct dw_mci *host = slot->host;
1698         const struct dw_mci_drv_data *drv_data = host->drv_data;
1699
1700         if (drv_data && drv_data->prepare_hs400_tuning)
1701                 return drv_data->prepare_hs400_tuning(host, ios);
1702
1703         return 0;
1704 }
1705
1706 static bool dw_mci_reset(struct dw_mci *host)
1707 {
1708         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
1709         bool ret = false;
1710         u32 status = 0;
1711
1712         /*
1713          * Resetting generates a block interrupt, hence setting
1714          * the scatter-gather pointer to NULL.
1715          */
1716         if (host->sg) {
1717                 sg_miter_stop(&host->sg_miter);
1718                 host->sg = NULL;
1719         }
1720
1721         if (host->use_dma)
1722                 flags |= SDMMC_CTRL_DMA_RESET;
1723
1724         if (dw_mci_ctrl_reset(host, flags)) {
1725                 /*
1726                  * In all cases we clear the RAWINTS
1727                  * register to clear any interrupts.
1728                  */
1729                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1730
1731                 if (!host->use_dma) {
1732                         ret = true;
1733                         goto ciu_out;
1734                 }
1735
1736                 /* Wait for dma_req to be cleared */
1737                 if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS,
1738                                               status,
1739                                               !(status & SDMMC_STATUS_DMA_REQ),
1740                                               1, 500 * USEC_PER_MSEC)) {
1741                         dev_err(host->dev,
1742                                 "%s: Timeout waiting for dma_req to be cleared\n",
1743                                 __func__);
1744                         goto ciu_out;
1745                 }
1746
1747                 /* when using DMA next we reset the fifo again */
1748                 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
1749                         goto ciu_out;
1750         } else {
1751                 /* if the controller reset bit did clear, then set clock regs */
1752                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
1753                         dev_err(host->dev,
1754                                 "%s: fifo/dma reset bits didn't clear but ciu was reset, doing clock update\n",
1755                                 __func__);
1756                         goto ciu_out;
1757                 }
1758         }
1759
1760         if (host->use_dma == TRANS_MODE_IDMAC)
1761                 /* It is also required that we reinit idmac */
1762                 dw_mci_idmac_init(host);
1763
1764         ret = true;
1765
1766 ciu_out:
1767         /* After a CTRL reset we need to have CIU set clock registers  */
1768         mci_send_cmd(host->slot, SDMMC_CMD_UPD_CLK, 0);
1769
1770         return ret;
1771 }
1772
1773 static const struct mmc_host_ops dw_mci_ops = {
1774         .request                = dw_mci_request,
1775         .pre_req                = dw_mci_pre_req,
1776         .post_req               = dw_mci_post_req,
1777         .set_ios                = dw_mci_set_ios,
1778         .get_ro                 = dw_mci_get_ro,
1779         .get_cd                 = dw_mci_get_cd,
1780         .hw_reset               = dw_mci_hw_reset,
1781         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1782         .ack_sdio_irq           = dw_mci_ack_sdio_irq,
1783         .execute_tuning         = dw_mci_execute_tuning,
1784         .card_busy              = dw_mci_card_busy,
1785         .start_signal_voltage_switch = dw_mci_switch_voltage,
1786         .init_card              = dw_mci_init_card,
1787         .prepare_hs400_tuning   = dw_mci_prepare_hs400_tuning,
1788 };
1789
1790 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1791         __releases(&host->lock)
1792         __acquires(&host->lock)
1793 {
1794         struct dw_mci_slot *slot;
1795         struct mmc_host *prev_mmc = host->slot->mmc;
1796
1797         WARN_ON(host->cmd || host->data);
1798
1799         host->slot->mrq = NULL;
1800         host->mrq = NULL;
1801         if (!list_empty(&host->queue)) {
1802                 slot = list_entry(host->queue.next,
1803                                   struct dw_mci_slot, queue_node);
1804                 list_del(&slot->queue_node);
1805                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1806                          mmc_hostname(slot->mmc));
1807                 host->state = STATE_SENDING_CMD;
1808                 dw_mci_start_request(host, slot);
1809         } else {
1810                 dev_vdbg(host->dev, "list empty\n");
1811
1812                 if (host->state == STATE_SENDING_CMD11)
1813                         host->state = STATE_WAITING_CMD11_DONE;
1814                 else
1815                         host->state = STATE_IDLE;
1816         }
1817
1818         spin_unlock(&host->lock);
1819         mmc_request_done(prev_mmc, mrq);
1820         spin_lock(&host->lock);
1821 }
1822
1823 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1824 {
1825         u32 status = host->cmd_status;
1826
1827         host->cmd_status = 0;
1828
1829         /* Read the response from the card (up to 16 bytes) */
1830         if (cmd->flags & MMC_RSP_PRESENT) {
1831                 if (cmd->flags & MMC_RSP_136) {
1832                         cmd->resp[3] = mci_readl(host, RESP0);
1833                         cmd->resp[2] = mci_readl(host, RESP1);
1834                         cmd->resp[1] = mci_readl(host, RESP2);
1835                         cmd->resp[0] = mci_readl(host, RESP3);
1836                 } else {
1837                         cmd->resp[0] = mci_readl(host, RESP0);
1838                         cmd->resp[1] = 0;
1839                         cmd->resp[2] = 0;
1840                         cmd->resp[3] = 0;
1841                 }
1842         }
1843
1844         if (status & SDMMC_INT_RTO)
1845                 cmd->error = -ETIMEDOUT;
1846         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1847                 cmd->error = -EILSEQ;
1848         else if (status & SDMMC_INT_RESP_ERR)
1849                 cmd->error = -EIO;
1850         else
1851                 cmd->error = 0;
1852
1853         return cmd->error;
1854 }
1855
1856 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1857 {
1858         u32 status = host->data_status;
1859
1860         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1861                 if (status & SDMMC_INT_DRTO) {
1862                         data->error = -ETIMEDOUT;
1863                 } else if (status & SDMMC_INT_DCRC) {
1864                         data->error = -EILSEQ;
1865                 } else if (status & SDMMC_INT_EBE) {
1866                         if (host->dir_status ==
1867                                 DW_MCI_SEND_STATUS) {
1868                                 /*
1869                                  * No data CRC status was returned.
1870                                  * The number of bytes transferred
1871                                  * will be exaggerated in PIO mode.
1872                                  */
1873                                 data->bytes_xfered = 0;
1874                                 data->error = -ETIMEDOUT;
1875                         } else if (host->dir_status ==
1876                                         DW_MCI_RECV_STATUS) {
1877                                 data->error = -EILSEQ;
1878                         }
1879                 } else {
1880                         /* SDMMC_INT_SBE is included */
1881                         data->error = -EILSEQ;
1882                 }
1883
1884                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1885
1886                 /*
1887                  * After an error, there may be data lingering
1888                  * in the FIFO
1889                  */
1890                 dw_mci_reset(host);
1891         } else {
1892                 data->bytes_xfered = data->blocks * data->blksz;
1893                 data->error = 0;
1894         }
1895
1896         return data->error;
1897 }
1898
1899 static void dw_mci_set_drto(struct dw_mci *host)
1900 {
1901         unsigned int drto_clks;
1902         unsigned int drto_div;
1903         unsigned int drto_ms;
1904         unsigned long irqflags;
1905
1906         drto_clks = mci_readl(host, TMOUT) >> 8;
1907         drto_div = (mci_readl(host, CLKDIV) & 0xff) * 2;
1908         if (drto_div == 0)
1909                 drto_div = 1;
1910
1911         drto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * drto_clks * drto_div,
1912                                    host->bus_hz);
1913
1914         /* add a bit spare time */
1915         drto_ms += 10;
1916
1917         spin_lock_irqsave(&host->irq_lock, irqflags);
1918         if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events))
1919                 mod_timer(&host->dto_timer,
1920                           jiffies + msecs_to_jiffies(drto_ms));
1921         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1922 }
1923
1924 static bool dw_mci_clear_pending_cmd_complete(struct dw_mci *host)
1925 {
1926         if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1927                 return false;
1928
1929         /*
1930          * Really be certain that the timer has stopped.  This is a bit of
1931          * paranoia and could only really happen if we had really bad
1932          * interrupt latency and the interrupt routine and timeout were
1933          * running concurrently so that the del_timer() in the interrupt
1934          * handler couldn't run.
1935          */
1936         WARN_ON(del_timer_sync(&host->cto_timer));
1937         clear_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1938
1939         return true;
1940 }
1941
1942 static bool dw_mci_clear_pending_data_complete(struct dw_mci *host)
1943 {
1944         if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events))
1945                 return false;
1946
1947         /* Extra paranoia just like dw_mci_clear_pending_cmd_complete() */
1948         WARN_ON(del_timer_sync(&host->dto_timer));
1949         clear_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1950
1951         return true;
1952 }
1953
1954 static void dw_mci_tasklet_func(unsigned long priv)
1955 {
1956         struct dw_mci *host = (struct dw_mci *)priv;
1957         struct mmc_data *data;
1958         struct mmc_command *cmd;
1959         struct mmc_request *mrq;
1960         enum dw_mci_state state;
1961         enum dw_mci_state prev_state;
1962         unsigned int err;
1963
1964         spin_lock(&host->lock);
1965
1966         state = host->state;
1967         data = host->data;
1968         mrq = host->mrq;
1969
1970         do {
1971                 prev_state = state;
1972
1973                 switch (state) {
1974                 case STATE_IDLE:
1975                 case STATE_WAITING_CMD11_DONE:
1976                         break;
1977
1978                 case STATE_SENDING_CMD11:
1979                 case STATE_SENDING_CMD:
1980                         if (!dw_mci_clear_pending_cmd_complete(host))
1981                                 break;
1982
1983                         cmd = host->cmd;
1984                         host->cmd = NULL;
1985                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1986                         err = dw_mci_command_complete(host, cmd);
1987                         if (cmd == mrq->sbc && !err) {
1988                                 __dw_mci_start_request(host, host->slot,
1989                                                        mrq->cmd);
1990                                 goto unlock;
1991                         }
1992
1993                         if (cmd->data && err) {
1994                                 /*
1995                                  * During UHS tuning sequence, sending the stop
1996                                  * command after the response CRC error would
1997                                  * throw the system into a confused state
1998                                  * causing all future tuning phases to report
1999                                  * failure.
2000                                  *
2001                                  * In such case controller will move into a data
2002                                  * transfer state after a response error or
2003                                  * response CRC error. Let's let that finish
2004                                  * before trying to send a stop, so we'll go to
2005                                  * STATE_SENDING_DATA.
2006                                  *
2007                                  * Although letting the data transfer take place
2008                                  * will waste a bit of time (we already know
2009                                  * the command was bad), it can't cause any
2010                                  * errors since it's possible it would have
2011                                  * taken place anyway if this tasklet got
2012                                  * delayed. Allowing the transfer to take place
2013                                  * avoids races and keeps things simple.
2014                                  */
2015                                 if (err != -ETIMEDOUT) {
2016                                         state = STATE_SENDING_DATA;
2017                                         continue;
2018                                 }
2019
2020                                 dw_mci_stop_dma(host);
2021                                 send_stop_abort(host, data);
2022                                 state = STATE_SENDING_STOP;
2023                                 break;
2024                         }
2025
2026                         if (!cmd->data || err) {
2027                                 dw_mci_request_end(host, mrq);
2028                                 goto unlock;
2029                         }
2030
2031                         prev_state = state = STATE_SENDING_DATA;
2032                         /* fall through */
2033
2034                 case STATE_SENDING_DATA:
2035                         /*
2036                          * We could get a data error and never a transfer
2037                          * complete so we'd better check for it here.
2038                          *
2039                          * Note that we don't really care if we also got a
2040                          * transfer complete; stopping the DMA and sending an
2041                          * abort won't hurt.
2042                          */
2043                         if (test_and_clear_bit(EVENT_DATA_ERROR,
2044                                                &host->pending_events)) {
2045                                 dw_mci_stop_dma(host);
2046                                 if (!(host->data_status & (SDMMC_INT_DRTO |
2047                                                            SDMMC_INT_EBE)))
2048                                         send_stop_abort(host, data);
2049                                 state = STATE_DATA_ERROR;
2050                                 break;
2051                         }
2052
2053                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
2054                                                 &host->pending_events)) {
2055                                 /*
2056                                  * If all data-related interrupts don't come
2057                                  * within the given time in reading data state.
2058                                  */
2059                                 if (host->dir_status == DW_MCI_RECV_STATUS)
2060                                         dw_mci_set_drto(host);
2061                                 break;
2062                         }
2063
2064                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
2065
2066                         /*
2067                          * Handle an EVENT_DATA_ERROR that might have shown up
2068                          * before the transfer completed.  This might not have
2069                          * been caught by the check above because the interrupt
2070                          * could have gone off between the previous check and
2071                          * the check for transfer complete.
2072                          *
2073                          * Technically this ought not be needed assuming we
2074                          * get a DATA_COMPLETE eventually (we'll notice the
2075                          * error and end the request), but it shouldn't hurt.
2076                          *
2077                          * This has the advantage of sending the stop command.
2078                          */
2079                         if (test_and_clear_bit(EVENT_DATA_ERROR,
2080                                                &host->pending_events)) {
2081                                 dw_mci_stop_dma(host);
2082                                 if (!(host->data_status & (SDMMC_INT_DRTO |
2083                                                            SDMMC_INT_EBE)))
2084                                         send_stop_abort(host, data);
2085                                 state = STATE_DATA_ERROR;
2086                                 break;
2087                         }
2088                         prev_state = state = STATE_DATA_BUSY;
2089
2090                         /* fall through */
2091
2092                 case STATE_DATA_BUSY:
2093                         if (!dw_mci_clear_pending_data_complete(host)) {
2094                                 /*
2095                                  * If data error interrupt comes but data over
2096                                  * interrupt doesn't come within the given time.
2097                                  * in reading data state.
2098                                  */
2099                                 if (host->dir_status == DW_MCI_RECV_STATUS)
2100                                         dw_mci_set_drto(host);
2101                                 break;
2102                         }
2103
2104                         host->data = NULL;
2105                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
2106                         err = dw_mci_data_complete(host, data);
2107
2108                         if (!err) {
2109                                 if (!data->stop || mrq->sbc) {
2110                                         if (mrq->sbc && data->stop)
2111                                                 data->stop->error = 0;
2112                                         dw_mci_request_end(host, mrq);
2113                                         goto unlock;
2114                                 }
2115
2116                                 /* stop command for open-ended transfer*/
2117                                 if (data->stop)
2118                                         send_stop_abort(host, data);
2119                         } else {
2120                                 /*
2121                                  * If we don't have a command complete now we'll
2122                                  * never get one since we just reset everything;
2123                                  * better end the request.
2124                                  *
2125                                  * If we do have a command complete we'll fall
2126                                  * through to the SENDING_STOP command and
2127                                  * everything will be peachy keen.
2128                                  */
2129                                 if (!test_bit(EVENT_CMD_COMPLETE,
2130                                               &host->pending_events)) {
2131                                         host->cmd = NULL;
2132                                         dw_mci_request_end(host, mrq);
2133                                         goto unlock;
2134                                 }
2135                         }
2136
2137                         /*
2138                          * If err has non-zero,
2139                          * stop-abort command has been already issued.
2140                          */
2141                         prev_state = state = STATE_SENDING_STOP;
2142
2143                         /* fall through */
2144
2145                 case STATE_SENDING_STOP:
2146                         if (!dw_mci_clear_pending_cmd_complete(host))
2147                                 break;
2148
2149                         /* CMD error in data command */
2150                         if (mrq->cmd->error && mrq->data)
2151                                 dw_mci_reset(host);
2152
2153                         host->cmd = NULL;
2154                         host->data = NULL;
2155
2156                         if (!mrq->sbc && mrq->stop)
2157                                 dw_mci_command_complete(host, mrq->stop);
2158                         else
2159                                 host->cmd_status = 0;
2160
2161                         dw_mci_request_end(host, mrq);
2162                         goto unlock;
2163
2164                 case STATE_DATA_ERROR:
2165                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
2166                                                 &host->pending_events))
2167                                 break;
2168
2169                         state = STATE_DATA_BUSY;
2170                         break;
2171                 }
2172         } while (state != prev_state);
2173
2174         host->state = state;
2175 unlock:
2176         spin_unlock(&host->lock);
2177
2178 }
2179
2180 /* push final bytes to part_buf, only use during push */
2181 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
2182 {
2183         memcpy((void *)&host->part_buf, buf, cnt);
2184         host->part_buf_count = cnt;
2185 }
2186
2187 /* append bytes to part_buf, only use during push */
2188 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
2189 {
2190         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
2191         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
2192         host->part_buf_count += cnt;
2193         return cnt;
2194 }
2195
2196 /* pull first bytes from part_buf, only use during pull */
2197 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
2198 {
2199         cnt = min_t(int, cnt, host->part_buf_count);
2200         if (cnt) {
2201                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
2202                        cnt);
2203                 host->part_buf_count -= cnt;
2204                 host->part_buf_start += cnt;
2205         }
2206         return cnt;
2207 }
2208
2209 /* pull final bytes from the part_buf, assuming it's just been filled */
2210 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
2211 {
2212         memcpy(buf, &host->part_buf, cnt);
2213         host->part_buf_start = cnt;
2214         host->part_buf_count = (1 << host->data_shift) - cnt;
2215 }
2216
2217 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
2218 {
2219         struct mmc_data *data = host->data;
2220         int init_cnt = cnt;
2221
2222         /* try and push anything in the part_buf */
2223         if (unlikely(host->part_buf_count)) {
2224                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2225
2226                 buf += len;
2227                 cnt -= len;
2228                 if (host->part_buf_count == 2) {
2229                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2230                         host->part_buf_count = 0;
2231                 }
2232         }
2233 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2234         if (unlikely((unsigned long)buf & 0x1)) {
2235                 while (cnt >= 2) {
2236                         u16 aligned_buf[64];
2237                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2238                         int items = len >> 1;
2239                         int i;
2240                         /* memcpy from input buffer into aligned buffer */
2241                         memcpy(aligned_buf, buf, len);
2242                         buf += len;
2243                         cnt -= len;
2244                         /* push data from aligned buffer into fifo */
2245                         for (i = 0; i < items; ++i)
2246                                 mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
2247                 }
2248         } else
2249 #endif
2250         {
2251                 u16 *pdata = buf;
2252
2253                 for (; cnt >= 2; cnt -= 2)
2254                         mci_fifo_writew(host->fifo_reg, *pdata++);
2255                 buf = pdata;
2256         }
2257         /* put anything remaining in the part_buf */
2258         if (cnt) {
2259                 dw_mci_set_part_bytes(host, buf, cnt);
2260                  /* Push data if we have reached the expected data length */
2261                 if ((data->bytes_xfered + init_cnt) ==
2262                     (data->blksz * data->blocks))
2263                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2264         }
2265 }
2266
2267 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
2268 {
2269 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2270         if (unlikely((unsigned long)buf & 0x1)) {
2271                 while (cnt >= 2) {
2272                         /* pull data from fifo into aligned buffer */
2273                         u16 aligned_buf[64];
2274                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2275                         int items = len >> 1;
2276                         int i;
2277
2278                         for (i = 0; i < items; ++i)
2279                                 aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
2280                         /* memcpy from aligned buffer into output buffer */
2281                         memcpy(buf, aligned_buf, len);
2282                         buf += len;
2283                         cnt -= len;
2284                 }
2285         } else
2286 #endif
2287         {
2288                 u16 *pdata = buf;
2289
2290                 for (; cnt >= 2; cnt -= 2)
2291                         *pdata++ = mci_fifo_readw(host->fifo_reg);
2292                 buf = pdata;
2293         }
2294         if (cnt) {
2295                 host->part_buf16 = mci_fifo_readw(host->fifo_reg);
2296                 dw_mci_pull_final_bytes(host, buf, cnt);
2297         }
2298 }
2299
2300 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
2301 {
2302         struct mmc_data *data = host->data;
2303         int init_cnt = cnt;
2304
2305         /* try and push anything in the part_buf */
2306         if (unlikely(host->part_buf_count)) {
2307                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2308
2309                 buf += len;
2310                 cnt -= len;
2311                 if (host->part_buf_count == 4) {
2312                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2313                         host->part_buf_count = 0;
2314                 }
2315         }
2316 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2317         if (unlikely((unsigned long)buf & 0x3)) {
2318                 while (cnt >= 4) {
2319                         u32 aligned_buf[32];
2320                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2321                         int items = len >> 2;
2322                         int i;
2323                         /* memcpy from input buffer into aligned buffer */
2324                         memcpy(aligned_buf, buf, len);
2325                         buf += len;
2326                         cnt -= len;
2327                         /* push data from aligned buffer into fifo */
2328                         for (i = 0; i < items; ++i)
2329                                 mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
2330                 }
2331         } else
2332 #endif
2333         {
2334                 u32 *pdata = buf;
2335
2336                 for (; cnt >= 4; cnt -= 4)
2337                         mci_fifo_writel(host->fifo_reg, *pdata++);
2338                 buf = pdata;
2339         }
2340         /* put anything remaining in the part_buf */
2341         if (cnt) {
2342                 dw_mci_set_part_bytes(host, buf, cnt);
2343                  /* Push data if we have reached the expected data length */
2344                 if ((data->bytes_xfered + init_cnt) ==
2345                     (data->blksz * data->blocks))
2346                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2347         }
2348 }
2349
2350 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
2351 {
2352 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2353         if (unlikely((unsigned long)buf & 0x3)) {
2354                 while (cnt >= 4) {
2355                         /* pull data from fifo into aligned buffer */
2356                         u32 aligned_buf[32];
2357                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2358                         int items = len >> 2;
2359                         int i;
2360
2361                         for (i = 0; i < items; ++i)
2362                                 aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
2363                         /* memcpy from aligned buffer into output buffer */
2364                         memcpy(buf, aligned_buf, len);
2365                         buf += len;
2366                         cnt -= len;
2367                 }
2368         } else
2369 #endif
2370         {
2371                 u32 *pdata = buf;
2372
2373                 for (; cnt >= 4; cnt -= 4)
2374                         *pdata++ = mci_fifo_readl(host->fifo_reg);
2375                 buf = pdata;
2376         }
2377         if (cnt) {
2378                 host->part_buf32 = mci_fifo_readl(host->fifo_reg);
2379                 dw_mci_pull_final_bytes(host, buf, cnt);
2380         }
2381 }
2382
2383 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
2384 {
2385         struct mmc_data *data = host->data;
2386         int init_cnt = cnt;
2387
2388         /* try and push anything in the part_buf */
2389         if (unlikely(host->part_buf_count)) {
2390                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2391
2392                 buf += len;
2393                 cnt -= len;
2394
2395                 if (host->part_buf_count == 8) {
2396                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2397                         host->part_buf_count = 0;
2398                 }
2399         }
2400 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2401         if (unlikely((unsigned long)buf & 0x7)) {
2402                 while (cnt >= 8) {
2403                         u64 aligned_buf[16];
2404                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2405                         int items = len >> 3;
2406                         int i;
2407                         /* memcpy from input buffer into aligned buffer */
2408                         memcpy(aligned_buf, buf, len);
2409                         buf += len;
2410                         cnt -= len;
2411                         /* push data from aligned buffer into fifo */
2412                         for (i = 0; i < items; ++i)
2413                                 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
2414                 }
2415         } else
2416 #endif
2417         {
2418                 u64 *pdata = buf;
2419
2420                 for (; cnt >= 8; cnt -= 8)
2421                         mci_fifo_writeq(host->fifo_reg, *pdata++);
2422                 buf = pdata;
2423         }
2424         /* put anything remaining in the part_buf */
2425         if (cnt) {
2426                 dw_mci_set_part_bytes(host, buf, cnt);
2427                 /* Push data if we have reached the expected data length */
2428                 if ((data->bytes_xfered + init_cnt) ==
2429                     (data->blksz * data->blocks))
2430                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2431         }
2432 }
2433
2434 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
2435 {
2436 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2437         if (unlikely((unsigned long)buf & 0x7)) {
2438                 while (cnt >= 8) {
2439                         /* pull data from fifo into aligned buffer */
2440                         u64 aligned_buf[16];
2441                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2442                         int items = len >> 3;
2443                         int i;
2444
2445                         for (i = 0; i < items; ++i)
2446                                 aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
2447
2448                         /* memcpy from aligned buffer into output buffer */
2449                         memcpy(buf, aligned_buf, len);
2450                         buf += len;
2451                         cnt -= len;
2452                 }
2453         } else
2454 #endif
2455         {
2456                 u64 *pdata = buf;
2457
2458                 for (; cnt >= 8; cnt -= 8)
2459                         *pdata++ = mci_fifo_readq(host->fifo_reg);
2460                 buf = pdata;
2461         }
2462         if (cnt) {
2463                 host->part_buf = mci_fifo_readq(host->fifo_reg);
2464                 dw_mci_pull_final_bytes(host, buf, cnt);
2465         }
2466 }
2467
2468 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
2469 {
2470         int len;
2471
2472         /* get remaining partial bytes */
2473         len = dw_mci_pull_part_bytes(host, buf, cnt);
2474         if (unlikely(len == cnt))
2475                 return;
2476         buf += len;
2477         cnt -= len;
2478
2479         /* get the rest of the data */
2480         host->pull_data(host, buf, cnt);
2481 }
2482
2483 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
2484 {
2485         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2486         void *buf;
2487         unsigned int offset;
2488         struct mmc_data *data = host->data;
2489         int shift = host->data_shift;
2490         u32 status;
2491         unsigned int len;
2492         unsigned int remain, fcnt;
2493
2494         do {
2495                 if (!sg_miter_next(sg_miter))
2496                         goto done;
2497
2498                 host->sg = sg_miter->piter.sg;
2499                 buf = sg_miter->addr;
2500                 remain = sg_miter->length;
2501                 offset = 0;
2502
2503                 do {
2504                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
2505                                         << shift) + host->part_buf_count;
2506                         len = min(remain, fcnt);
2507                         if (!len)
2508                                 break;
2509                         dw_mci_pull_data(host, (void *)(buf + offset), len);
2510                         data->bytes_xfered += len;
2511                         offset += len;
2512                         remain -= len;
2513                 } while (remain);
2514
2515                 sg_miter->consumed = offset;
2516                 status = mci_readl(host, MINTSTS);
2517                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2518         /* if the RXDR is ready read again */
2519         } while ((status & SDMMC_INT_RXDR) ||
2520                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
2521
2522         if (!remain) {
2523                 if (!sg_miter_next(sg_miter))
2524                         goto done;
2525                 sg_miter->consumed = 0;
2526         }
2527         sg_miter_stop(sg_miter);
2528         return;
2529
2530 done:
2531         sg_miter_stop(sg_miter);
2532         host->sg = NULL;
2533         smp_wmb(); /* drain writebuffer */
2534         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2535 }
2536
2537 static void dw_mci_write_data_pio(struct dw_mci *host)
2538 {
2539         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2540         void *buf;
2541         unsigned int offset;
2542         struct mmc_data *data = host->data;
2543         int shift = host->data_shift;
2544         u32 status;
2545         unsigned int len;
2546         unsigned int fifo_depth = host->fifo_depth;
2547         unsigned int remain, fcnt;
2548
2549         do {
2550                 if (!sg_miter_next(sg_miter))
2551                         goto done;
2552
2553                 host->sg = sg_miter->piter.sg;
2554                 buf = sg_miter->addr;
2555                 remain = sg_miter->length;
2556                 offset = 0;
2557
2558                 do {
2559                         fcnt = ((fifo_depth -
2560                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2561                                         << shift) - host->part_buf_count;
2562                         len = min(remain, fcnt);
2563                         if (!len)
2564                                 break;
2565                         host->push_data(host, (void *)(buf + offset), len);
2566                         data->bytes_xfered += len;
2567                         offset += len;
2568                         remain -= len;
2569                 } while (remain);
2570
2571                 sg_miter->consumed = offset;
2572                 status = mci_readl(host, MINTSTS);
2573                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2574         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2575
2576         if (!remain) {
2577                 if (!sg_miter_next(sg_miter))
2578                         goto done;
2579                 sg_miter->consumed = 0;
2580         }
2581         sg_miter_stop(sg_miter);
2582         return;
2583
2584 done:
2585         sg_miter_stop(sg_miter);
2586         host->sg = NULL;
2587         smp_wmb(); /* drain writebuffer */
2588         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2589 }
2590
2591 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2592 {
2593         del_timer(&host->cto_timer);
2594
2595         if (!host->cmd_status)
2596                 host->cmd_status = status;
2597
2598         smp_wmb(); /* drain writebuffer */
2599
2600         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2601         tasklet_schedule(&host->tasklet);
2602 }
2603
2604 static void dw_mci_handle_cd(struct dw_mci *host)
2605 {
2606         struct dw_mci_slot *slot = host->slot;
2607
2608         if (slot->mmc->ops->card_event)
2609                 slot->mmc->ops->card_event(slot->mmc);
2610         mmc_detect_change(slot->mmc,
2611                 msecs_to_jiffies(host->pdata->detect_delay_ms));
2612 }
2613
2614 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2615 {
2616         struct dw_mci *host = dev_id;
2617         u32 pending;
2618         struct dw_mci_slot *slot = host->slot;
2619         unsigned long irqflags;
2620
2621         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2622
2623         if (pending) {
2624                 /* Check volt switch first, since it can look like an error */
2625                 if ((host->state == STATE_SENDING_CMD11) &&
2626                     (pending & SDMMC_INT_VOLT_SWITCH)) {
2627                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2628                         pending &= ~SDMMC_INT_VOLT_SWITCH;
2629
2630                         /*
2631                          * Hold the lock; we know cmd11_timer can't be kicked
2632                          * off after the lock is released, so safe to delete.
2633                          */
2634                         spin_lock_irqsave(&host->irq_lock, irqflags);
2635                         dw_mci_cmd_interrupt(host, pending);
2636                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2637
2638                         del_timer(&host->cmd11_timer);
2639                 }
2640
2641                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2642                         spin_lock_irqsave(&host->irq_lock, irqflags);
2643
2644                         del_timer(&host->cto_timer);
2645                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2646                         host->cmd_status = pending;
2647                         smp_wmb(); /* drain writebuffer */
2648                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2649
2650                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2651                 }
2652
2653                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2654                         /* if there is an error report DATA_ERROR */
2655                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2656                         host->data_status = pending;
2657                         smp_wmb(); /* drain writebuffer */
2658                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
2659                         tasklet_schedule(&host->tasklet);
2660                 }
2661
2662                 if (pending & SDMMC_INT_DATA_OVER) {
2663                         spin_lock_irqsave(&host->irq_lock, irqflags);
2664
2665                         del_timer(&host->dto_timer);
2666
2667                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2668                         if (!host->data_status)
2669                                 host->data_status = pending;
2670                         smp_wmb(); /* drain writebuffer */
2671                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2672                                 if (host->sg != NULL)
2673                                         dw_mci_read_data_pio(host, true);
2674                         }
2675                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2676                         tasklet_schedule(&host->tasklet);
2677
2678                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2679                 }
2680
2681                 if (pending & SDMMC_INT_RXDR) {
2682                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2683                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2684                                 dw_mci_read_data_pio(host, false);
2685                 }
2686
2687                 if (pending & SDMMC_INT_TXDR) {
2688                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2689                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2690                                 dw_mci_write_data_pio(host);
2691                 }
2692
2693                 if (pending & SDMMC_INT_CMD_DONE) {
2694                         spin_lock_irqsave(&host->irq_lock, irqflags);
2695
2696                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2697                         dw_mci_cmd_interrupt(host, pending);
2698
2699                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2700                 }
2701
2702                 if (pending & SDMMC_INT_CD) {
2703                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2704                         dw_mci_handle_cd(host);
2705                 }
2706
2707                 if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2708                         mci_writel(host, RINTSTS,
2709                                    SDMMC_INT_SDIO(slot->sdio_id));
2710                         __dw_mci_enable_sdio_irq(slot, 0);
2711                         sdio_signal_irq(slot->mmc);
2712                 }
2713
2714         }
2715
2716         if (host->use_dma != TRANS_MODE_IDMAC)
2717                 return IRQ_HANDLED;
2718
2719         /* Handle IDMA interrupts */
2720         if (host->dma_64bit_address == 1) {
2721                 pending = mci_readl(host, IDSTS64);
2722                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2723                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2724                                                         SDMMC_IDMAC_INT_RI);
2725                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2726                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2727                                 host->dma_ops->complete((void *)host);
2728                 }
2729         } else {
2730                 pending = mci_readl(host, IDSTS);
2731                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2732                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2733                                                         SDMMC_IDMAC_INT_RI);
2734                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2735                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2736                                 host->dma_ops->complete((void *)host);
2737                 }
2738         }
2739
2740         return IRQ_HANDLED;
2741 }
2742
2743 static int dw_mci_init_slot_caps(struct dw_mci_slot *slot)
2744 {
2745         struct dw_mci *host = slot->host;
2746         const struct dw_mci_drv_data *drv_data = host->drv_data;
2747         struct mmc_host *mmc = slot->mmc;
2748         int ctrl_id;
2749
2750         if (host->pdata->caps)
2751                 mmc->caps = host->pdata->caps;
2752
2753         /*
2754          * Support MMC_CAP_ERASE by default.
2755          * It needs to use trim/discard/erase commands.
2756          */
2757         mmc->caps |= MMC_CAP_ERASE;
2758
2759         if (host->pdata->pm_caps)
2760                 mmc->pm_caps = host->pdata->pm_caps;
2761
2762         if (host->dev->of_node) {
2763                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2764                 if (ctrl_id < 0)
2765                         ctrl_id = 0;
2766         } else {
2767                 ctrl_id = to_platform_device(host->dev)->id;
2768         }
2769
2770         if (drv_data && drv_data->caps) {
2771                 if (ctrl_id >= drv_data->num_caps) {
2772                         dev_err(host->dev, "invalid controller id %d\n",
2773                                 ctrl_id);
2774                         return -EINVAL;
2775                 }
2776                 mmc->caps |= drv_data->caps[ctrl_id];
2777         }
2778
2779         if (host->pdata->caps2)
2780                 mmc->caps2 = host->pdata->caps2;
2781
2782         mmc->f_min = DW_MCI_FREQ_MIN;
2783         if (!mmc->f_max)
2784                 mmc->f_max = DW_MCI_FREQ_MAX;
2785
2786         /* Process SDIO IRQs through the sdio_irq_work. */
2787         if (mmc->caps & MMC_CAP_SDIO_IRQ)
2788                 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
2789
2790         return 0;
2791 }
2792
2793 static int dw_mci_init_slot(struct dw_mci *host)
2794 {
2795         struct mmc_host *mmc;
2796         struct dw_mci_slot *slot;
2797         int ret;
2798
2799         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2800         if (!mmc)
2801                 return -ENOMEM;
2802
2803         slot = mmc_priv(mmc);
2804         slot->id = 0;
2805         slot->sdio_id = host->sdio_id0 + slot->id;
2806         slot->mmc = mmc;
2807         slot->host = host;
2808         host->slot = slot;
2809
2810         mmc->ops = &dw_mci_ops;
2811
2812         /*if there are external regulators, get them*/
2813         ret = mmc_regulator_get_supply(mmc);
2814         if (ret)
2815                 goto err_host_allocated;
2816
2817         if (!mmc->ocr_avail)
2818                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2819
2820         ret = mmc_of_parse(mmc);
2821         if (ret)
2822                 goto err_host_allocated;
2823
2824         ret = dw_mci_init_slot_caps(slot);
2825         if (ret)
2826                 goto err_host_allocated;
2827
2828         /* Useful defaults if platform data is unset. */
2829         if (host->use_dma == TRANS_MODE_IDMAC) {
2830                 mmc->max_segs = host->ring_size;
2831                 mmc->max_blk_size = 65535;
2832                 mmc->max_seg_size = 0x1000;
2833                 mmc->max_req_size = mmc->max_seg_size * host->ring_size;
2834                 mmc->max_blk_count = mmc->max_req_size / 512;
2835         } else if (host->use_dma == TRANS_MODE_EDMAC) {
2836                 mmc->max_segs = 64;
2837                 mmc->max_blk_size = 65535;
2838                 mmc->max_blk_count = 65535;
2839                 mmc->max_req_size =
2840                                 mmc->max_blk_size * mmc->max_blk_count;
2841                 mmc->max_seg_size = mmc->max_req_size;
2842         } else {
2843                 /* TRANS_MODE_PIO */
2844                 mmc->max_segs = 64;
2845                 mmc->max_blk_size = 65535; /* BLKSIZ is 16 bits */
2846                 mmc->max_blk_count = 512;
2847                 mmc->max_req_size = mmc->max_blk_size *
2848                                     mmc->max_blk_count;
2849                 mmc->max_seg_size = mmc->max_req_size;
2850         }
2851
2852         dw_mci_get_cd(mmc);
2853
2854         ret = mmc_add_host(mmc);
2855         if (ret)
2856                 goto err_host_allocated;
2857
2858 #if defined(CONFIG_DEBUG_FS)
2859         dw_mci_init_debugfs(slot);
2860 #endif
2861
2862         return 0;
2863
2864 err_host_allocated:
2865         mmc_free_host(mmc);
2866         return ret;
2867 }
2868
2869 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot)
2870 {
2871         /* Debugfs stuff is cleaned up by mmc core */
2872         mmc_remove_host(slot->mmc);
2873         slot->host->slot = NULL;
2874         mmc_free_host(slot->mmc);
2875 }
2876
2877 static void dw_mci_init_dma(struct dw_mci *host)
2878 {
2879         int addr_config;
2880         struct device *dev = host->dev;
2881
2882         /*
2883         * Check tansfer mode from HCON[17:16]
2884         * Clear the ambiguous description of dw_mmc databook:
2885         * 2b'00: No DMA Interface -> Actually means using Internal DMA block
2886         * 2b'01: DesignWare DMA Interface -> Synopsys DW-DMA block
2887         * 2b'10: Generic DMA Interface -> non-Synopsys generic DMA block
2888         * 2b'11: Non DW DMA Interface -> pio only
2889         * Compared to DesignWare DMA Interface, Generic DMA Interface has a
2890         * simpler request/acknowledge handshake mechanism and both of them
2891         * are regarded as external dma master for dw_mmc.
2892         */
2893         host->use_dma = SDMMC_GET_TRANS_MODE(mci_readl(host, HCON));
2894         if (host->use_dma == DMA_INTERFACE_IDMA) {
2895                 host->use_dma = TRANS_MODE_IDMAC;
2896         } else if (host->use_dma == DMA_INTERFACE_DWDMA ||
2897                    host->use_dma == DMA_INTERFACE_GDMA) {
2898                 host->use_dma = TRANS_MODE_EDMAC;
2899         } else {
2900                 goto no_dma;
2901         }
2902
2903         /* Determine which DMA interface to use */
2904         if (host->use_dma == TRANS_MODE_IDMAC) {
2905                 /*
2906                 * Check ADDR_CONFIG bit in HCON to find
2907                 * IDMAC address bus width
2908                 */
2909                 addr_config = SDMMC_GET_ADDR_CONFIG(mci_readl(host, HCON));
2910
2911                 if (addr_config == 1) {
2912                         /* host supports IDMAC in 64-bit address mode */
2913                         host->dma_64bit_address = 1;
2914                         dev_info(host->dev,
2915                                  "IDMAC supports 64-bit address mode.\n");
2916                         if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2917                                 dma_set_coherent_mask(host->dev,
2918                                                       DMA_BIT_MASK(64));
2919                 } else {
2920                         /* host supports IDMAC in 32-bit address mode */
2921                         host->dma_64bit_address = 0;
2922                         dev_info(host->dev,
2923                                  "IDMAC supports 32-bit address mode.\n");
2924                 }
2925
2926                 /* Alloc memory for sg translation */
2927                 host->sg_cpu = dmam_alloc_coherent(host->dev,
2928                                                    DESC_RING_BUF_SZ,
2929                                                    &host->sg_dma, GFP_KERNEL);
2930                 if (!host->sg_cpu) {
2931                         dev_err(host->dev,
2932                                 "%s: could not alloc DMA memory\n",
2933                                 __func__);
2934                         goto no_dma;
2935                 }
2936
2937                 host->dma_ops = &dw_mci_idmac_ops;
2938                 dev_info(host->dev, "Using internal DMA controller.\n");
2939         } else {
2940                 /* TRANS_MODE_EDMAC: check dma bindings again */
2941                 if ((device_property_read_string_array(dev, "dma-names",
2942                                                        NULL, 0) < 0) ||
2943                     !device_property_present(dev, "dmas")) {
2944                         goto no_dma;
2945                 }
2946                 host->dma_ops = &dw_mci_edmac_ops;
2947                 dev_info(host->dev, "Using external DMA controller.\n");
2948         }
2949
2950         if (host->dma_ops->init && host->dma_ops->start &&
2951             host->dma_ops->stop && host->dma_ops->cleanup) {
2952                 if (host->dma_ops->init(host)) {
2953                         dev_err(host->dev, "%s: Unable to initialize DMA Controller.\n",
2954                                 __func__);
2955                         goto no_dma;
2956                 }
2957         } else {
2958                 dev_err(host->dev, "DMA initialization not found.\n");
2959                 goto no_dma;
2960         }
2961
2962         return;
2963
2964 no_dma:
2965         dev_info(host->dev, "Using PIO mode.\n");
2966         host->use_dma = TRANS_MODE_PIO;
2967 }
2968
2969 static void dw_mci_cmd11_timer(struct timer_list *t)
2970 {
2971         struct dw_mci *host = from_timer(host, t, cmd11_timer);
2972
2973         if (host->state != STATE_SENDING_CMD11) {
2974                 dev_warn(host->dev, "Unexpected CMD11 timeout\n");
2975                 return;
2976         }
2977
2978         host->cmd_status = SDMMC_INT_RTO;
2979         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2980         tasklet_schedule(&host->tasklet);
2981 }
2982
2983 static void dw_mci_cto_timer(struct timer_list *t)
2984 {
2985         struct dw_mci *host = from_timer(host, t, cto_timer);
2986         unsigned long irqflags;
2987         u32 pending;
2988
2989         spin_lock_irqsave(&host->irq_lock, irqflags);
2990
2991         /*
2992          * If somehow we have very bad interrupt latency it's remotely possible
2993          * that the timer could fire while the interrupt is still pending or
2994          * while the interrupt is midway through running.  Let's be paranoid
2995          * and detect those two cases.  Note that this is paranoia is somewhat
2996          * justified because in this function we don't actually cancel the
2997          * pending command in the controller--we just assume it will never come.
2998          */
2999         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
3000         if (pending & (DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_CMD_DONE)) {
3001                 /* The interrupt should fire; no need to act but we can warn */
3002                 dev_warn(host->dev, "Unexpected interrupt latency\n");
3003                 goto exit;
3004         }
3005         if (test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) {
3006                 /* Presumably interrupt handler couldn't delete the timer */
3007                 dev_warn(host->dev, "CTO timeout when already completed\n");
3008                 goto exit;
3009         }
3010
3011         /*
3012          * Continued paranoia to make sure we're in the state we expect.
3013          * This paranoia isn't really justified but it seems good to be safe.
3014          */
3015         switch (host->state) {
3016         case STATE_SENDING_CMD11:
3017         case STATE_SENDING_CMD:
3018         case STATE_SENDING_STOP:
3019                 /*
3020                  * If CMD_DONE interrupt does NOT come in sending command
3021                  * state, we should notify the driver to terminate current
3022                  * transfer and report a command timeout to the core.
3023                  */
3024                 host->cmd_status = SDMMC_INT_RTO;
3025                 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
3026                 tasklet_schedule(&host->tasklet);
3027                 break;
3028         default:
3029                 dev_warn(host->dev, "Unexpected command timeout, state %d\n",
3030                          host->state);
3031                 break;
3032         }
3033
3034 exit:
3035         spin_unlock_irqrestore(&host->irq_lock, irqflags);
3036 }
3037
3038 static void dw_mci_dto_timer(struct timer_list *t)
3039 {
3040         struct dw_mci *host = from_timer(host, t, dto_timer);
3041         unsigned long irqflags;
3042         u32 pending;
3043
3044         spin_lock_irqsave(&host->irq_lock, irqflags);
3045
3046         /*
3047          * The DTO timer is much longer than the CTO timer, so it's even less
3048          * likely that we'll these cases, but it pays to be paranoid.
3049          */
3050         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
3051         if (pending & SDMMC_INT_DATA_OVER) {
3052                 /* The interrupt should fire; no need to act but we can warn */
3053                 dev_warn(host->dev, "Unexpected data interrupt latency\n");
3054                 goto exit;
3055         }
3056         if (test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) {
3057                 /* Presumably interrupt handler couldn't delete the timer */
3058                 dev_warn(host->dev, "DTO timeout when already completed\n");
3059                 goto exit;
3060         }
3061
3062         /*
3063          * Continued paranoia to make sure we're in the state we expect.
3064          * This paranoia isn't really justified but it seems good to be safe.
3065          */
3066         switch (host->state) {
3067         case STATE_SENDING_DATA:
3068         case STATE_DATA_BUSY:
3069                 /*
3070                  * If DTO interrupt does NOT come in sending data state,
3071                  * we should notify the driver to terminate current transfer
3072                  * and report a data timeout to the core.
3073                  */
3074                 host->data_status = SDMMC_INT_DRTO;
3075                 set_bit(EVENT_DATA_ERROR, &host->pending_events);
3076                 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
3077                 tasklet_schedule(&host->tasklet);
3078                 break;
3079         default:
3080                 dev_warn(host->dev, "Unexpected data timeout, state %d\n",
3081                          host->state);
3082                 break;
3083         }
3084
3085 exit:
3086         spin_unlock_irqrestore(&host->irq_lock, irqflags);
3087 }
3088
3089 #ifdef CONFIG_OF
3090 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
3091 {
3092         struct dw_mci_board *pdata;
3093         struct device *dev = host->dev;
3094         const struct dw_mci_drv_data *drv_data = host->drv_data;
3095         int ret;
3096         u32 clock_frequency;
3097
3098         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
3099         if (!pdata)
3100                 return ERR_PTR(-ENOMEM);
3101
3102         /* find reset controller when exist */
3103         pdata->rstc = devm_reset_control_get_optional_exclusive(dev, "reset");
3104         if (IS_ERR(pdata->rstc)) {
3105                 if (PTR_ERR(pdata->rstc) == -EPROBE_DEFER)
3106                         return ERR_PTR(-EPROBE_DEFER);
3107         }
3108
3109         if (device_property_read_u32(dev, "fifo-depth", &pdata->fifo_depth))
3110                 dev_info(dev,
3111                          "fifo-depth property not found, using value of FIFOTH register as default\n");
3112
3113         device_property_read_u32(dev, "card-detect-delay",
3114                                  &pdata->detect_delay_ms);
3115
3116         device_property_read_u32(dev, "data-addr", &host->data_addr_override);
3117
3118         if (device_property_present(dev, "fifo-watermark-aligned"))
3119                 host->wm_aligned = true;
3120
3121         if (!device_property_read_u32(dev, "clock-frequency", &clock_frequency))
3122                 pdata->bus_hz = clock_frequency;
3123
3124         if (drv_data && drv_data->parse_dt) {
3125                 ret = drv_data->parse_dt(host);
3126                 if (ret)
3127                         return ERR_PTR(ret);
3128         }
3129
3130         return pdata;
3131 }
3132
3133 #else /* CONFIG_OF */
3134 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
3135 {
3136         return ERR_PTR(-EINVAL);
3137 }
3138 #endif /* CONFIG_OF */
3139
3140 static void dw_mci_enable_cd(struct dw_mci *host)
3141 {
3142         unsigned long irqflags;
3143         u32 temp;
3144
3145         /*
3146          * No need for CD if all slots have a non-error GPIO
3147          * as well as broken card detection is found.
3148          */
3149         if (host->slot->mmc->caps & MMC_CAP_NEEDS_POLL)
3150                 return;
3151
3152         if (mmc_gpio_get_cd(host->slot->mmc) < 0) {
3153                 spin_lock_irqsave(&host->irq_lock, irqflags);
3154                 temp = mci_readl(host, INTMASK);
3155                 temp  |= SDMMC_INT_CD;
3156                 mci_writel(host, INTMASK, temp);
3157                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
3158         }
3159 }
3160
3161 int dw_mci_probe(struct dw_mci *host)
3162 {
3163         const struct dw_mci_drv_data *drv_data = host->drv_data;
3164         int width, i, ret = 0;
3165         u32 fifo_size;
3166
3167         if (!host->pdata) {
3168                 host->pdata = dw_mci_parse_dt(host);
3169                 if (PTR_ERR(host->pdata) == -EPROBE_DEFER) {
3170                         return -EPROBE_DEFER;
3171                 } else if (IS_ERR(host->pdata)) {
3172                         dev_err(host->dev, "platform data not available\n");
3173                         return -EINVAL;
3174                 }
3175         }
3176
3177         host->biu_clk = devm_clk_get(host->dev, "biu");
3178         if (IS_ERR(host->biu_clk)) {
3179                 dev_dbg(host->dev, "biu clock not available\n");
3180         } else {
3181                 ret = clk_prepare_enable(host->biu_clk);
3182                 if (ret) {
3183                         dev_err(host->dev, "failed to enable biu clock\n");
3184                         return ret;
3185                 }
3186         }
3187
3188         host->ciu_clk = devm_clk_get(host->dev, "ciu");
3189         if (IS_ERR(host->ciu_clk)) {
3190                 dev_dbg(host->dev, "ciu clock not available\n");
3191                 host->bus_hz = host->pdata->bus_hz;
3192         } else {
3193                 ret = clk_prepare_enable(host->ciu_clk);
3194                 if (ret) {
3195                         dev_err(host->dev, "failed to enable ciu clock\n");
3196                         goto err_clk_biu;
3197                 }
3198
3199                 if (host->pdata->bus_hz) {
3200                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
3201                         if (ret)
3202                                 dev_warn(host->dev,
3203                                          "Unable to set bus rate to %uHz\n",
3204                                          host->pdata->bus_hz);
3205                 }
3206                 host->bus_hz = clk_get_rate(host->ciu_clk);
3207         }
3208
3209         if (!host->bus_hz) {
3210                 dev_err(host->dev,
3211                         "Platform data must supply bus speed\n");
3212                 ret = -ENODEV;
3213                 goto err_clk_ciu;
3214         }
3215
3216         if (!IS_ERR(host->pdata->rstc)) {
3217                 reset_control_assert(host->pdata->rstc);
3218                 usleep_range(10, 50);
3219                 reset_control_deassert(host->pdata->rstc);
3220         }
3221
3222         if (drv_data && drv_data->init) {
3223                 ret = drv_data->init(host);
3224                 if (ret) {
3225                         dev_err(host->dev,
3226                                 "implementation specific init failed\n");
3227                         goto err_clk_ciu;
3228                 }
3229         }
3230
3231         timer_setup(&host->cmd11_timer, dw_mci_cmd11_timer, 0);
3232         timer_setup(&host->cto_timer, dw_mci_cto_timer, 0);
3233         timer_setup(&host->dto_timer, dw_mci_dto_timer, 0);
3234
3235         spin_lock_init(&host->lock);
3236         spin_lock_init(&host->irq_lock);
3237         INIT_LIST_HEAD(&host->queue);
3238
3239         /*
3240          * Get the host data width - this assumes that HCON has been set with
3241          * the correct values.
3242          */
3243         i = SDMMC_GET_HDATA_WIDTH(mci_readl(host, HCON));
3244         if (!i) {
3245                 host->push_data = dw_mci_push_data16;
3246                 host->pull_data = dw_mci_pull_data16;
3247                 width = 16;
3248                 host->data_shift = 1;
3249         } else if (i == 2) {
3250                 host->push_data = dw_mci_push_data64;
3251                 host->pull_data = dw_mci_pull_data64;
3252                 width = 64;
3253                 host->data_shift = 3;
3254         } else {
3255                 /* Check for a reserved value, and warn if it is */
3256                 WARN((i != 1),
3257                      "HCON reports a reserved host data width!\n"
3258                      "Defaulting to 32-bit access.\n");
3259                 host->push_data = dw_mci_push_data32;
3260                 host->pull_data = dw_mci_pull_data32;
3261                 width = 32;
3262                 host->data_shift = 2;
3263         }
3264
3265         /* Reset all blocks */
3266         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3267                 ret = -ENODEV;
3268                 goto err_clk_ciu;
3269         }
3270
3271         host->dma_ops = host->pdata->dma_ops;
3272         dw_mci_init_dma(host);
3273
3274         /* Clear the interrupts for the host controller */
3275         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3276         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3277
3278         /* Put in max timeout */
3279         mci_writel(host, TMOUT, 0xFFFFFFFF);
3280
3281         /*
3282          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
3283          *                          Tx Mark = fifo_size / 2 DMA Size = 8
3284          */
3285         if (!host->pdata->fifo_depth) {
3286                 /*
3287                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
3288                  * have been overwritten by the bootloader, just like we're
3289                  * about to do, so if you know the value for your hardware, you
3290                  * should put it in the platform data.
3291                  */
3292                 fifo_size = mci_readl(host, FIFOTH);
3293                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
3294         } else {
3295                 fifo_size = host->pdata->fifo_depth;
3296         }
3297         host->fifo_depth = fifo_size;
3298         host->fifoth_val =
3299                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
3300         mci_writel(host, FIFOTH, host->fifoth_val);
3301
3302         /* disable clock to CIU */
3303         mci_writel(host, CLKENA, 0);
3304         mci_writel(host, CLKSRC, 0);
3305
3306         /*
3307          * In 2.40a spec, Data offset is changed.
3308          * Need to check the version-id and set data-offset for DATA register.
3309          */
3310         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
3311         dev_info(host->dev, "Version ID is %04x\n", host->verid);
3312
3313         if (host->data_addr_override)
3314                 host->fifo_reg = host->regs + host->data_addr_override;
3315         else if (host->verid < DW_MMC_240A)
3316                 host->fifo_reg = host->regs + DATA_OFFSET;
3317         else
3318                 host->fifo_reg = host->regs + DATA_240A_OFFSET;
3319
3320         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
3321         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
3322                                host->irq_flags, "dw-mci", host);
3323         if (ret)
3324                 goto err_dmaunmap;
3325
3326         /*
3327          * Enable interrupts for command done, data over, data empty,
3328          * receive ready and error such as transmit, receive timeout, crc error
3329          */
3330         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3331                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3332                    DW_MCI_ERROR_FLAGS);
3333         /* Enable mci interrupt */
3334         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3335
3336         dev_info(host->dev,
3337                  "DW MMC controller at irq %d,%d bit host data width,%u deep fifo\n",
3338                  host->irq, width, fifo_size);
3339
3340         /* We need at least one slot to succeed */
3341         ret = dw_mci_init_slot(host);
3342         if (ret) {
3343                 dev_dbg(host->dev, "slot %d init failed\n", i);
3344                 goto err_dmaunmap;
3345         }
3346
3347         /* Now that slots are all setup, we can enable card detect */
3348         dw_mci_enable_cd(host);
3349
3350         return 0;
3351
3352 err_dmaunmap:
3353         if (host->use_dma && host->dma_ops->exit)
3354                 host->dma_ops->exit(host);
3355
3356         if (!IS_ERR(host->pdata->rstc))
3357                 reset_control_assert(host->pdata->rstc);
3358
3359 err_clk_ciu:
3360         clk_disable_unprepare(host->ciu_clk);
3361
3362 err_clk_biu:
3363         clk_disable_unprepare(host->biu_clk);
3364
3365         return ret;
3366 }
3367 EXPORT_SYMBOL(dw_mci_probe);
3368
3369 void dw_mci_remove(struct dw_mci *host)
3370 {
3371         dev_dbg(host->dev, "remove slot\n");
3372         if (host->slot)
3373                 dw_mci_cleanup_slot(host->slot);
3374
3375         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3376         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3377
3378         /* disable clock to CIU */
3379         mci_writel(host, CLKENA, 0);
3380         mci_writel(host, CLKSRC, 0);
3381
3382         if (host->use_dma && host->dma_ops->exit)
3383                 host->dma_ops->exit(host);
3384
3385         if (!IS_ERR(host->pdata->rstc))
3386                 reset_control_assert(host->pdata->rstc);
3387
3388         clk_disable_unprepare(host->ciu_clk);
3389         clk_disable_unprepare(host->biu_clk);
3390 }
3391 EXPORT_SYMBOL(dw_mci_remove);
3392
3393
3394
3395 #ifdef CONFIG_PM
3396 int dw_mci_runtime_suspend(struct device *dev)
3397 {
3398         struct dw_mci *host = dev_get_drvdata(dev);
3399
3400         if (host->use_dma && host->dma_ops->exit)
3401                 host->dma_ops->exit(host);
3402
3403         clk_disable_unprepare(host->ciu_clk);
3404
3405         if (host->slot &&
3406             (mmc_can_gpio_cd(host->slot->mmc) ||
3407              !mmc_card_is_removable(host->slot->mmc)))
3408                 clk_disable_unprepare(host->biu_clk);
3409
3410         return 0;
3411 }
3412 EXPORT_SYMBOL(dw_mci_runtime_suspend);
3413
3414 int dw_mci_runtime_resume(struct device *dev)
3415 {
3416         int ret = 0;
3417         struct dw_mci *host = dev_get_drvdata(dev);
3418
3419         if (host->slot &&
3420             (mmc_can_gpio_cd(host->slot->mmc) ||
3421              !mmc_card_is_removable(host->slot->mmc))) {
3422                 ret = clk_prepare_enable(host->biu_clk);
3423                 if (ret)
3424                         return ret;
3425         }
3426
3427         ret = clk_prepare_enable(host->ciu_clk);
3428         if (ret)
3429                 goto err;
3430
3431         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3432                 clk_disable_unprepare(host->ciu_clk);
3433                 ret = -ENODEV;
3434                 goto err;
3435         }
3436
3437         if (host->use_dma && host->dma_ops->init)
3438                 host->dma_ops->init(host);
3439
3440         /*
3441          * Restore the initial value at FIFOTH register
3442          * And Invalidate the prev_blksz with zero
3443          */
3444          mci_writel(host, FIFOTH, host->fifoth_val);
3445          host->prev_blksz = 0;
3446
3447         /* Put in max timeout */
3448         mci_writel(host, TMOUT, 0xFFFFFFFF);
3449
3450         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3451         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3452                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3453                    DW_MCI_ERROR_FLAGS);
3454         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3455
3456
3457         if (host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER)
3458                 dw_mci_set_ios(host->slot->mmc, &host->slot->mmc->ios);
3459
3460         /* Force setup bus to guarantee available clock output */
3461         dw_mci_setup_bus(host->slot, true);
3462
3463         /* Re-enable SDIO interrupts. */
3464         if (sdio_irq_claimed(host->slot->mmc))
3465                 __dw_mci_enable_sdio_irq(host->slot, 1);
3466
3467         /* Now that slots are all setup, we can enable card detect */
3468         dw_mci_enable_cd(host);
3469
3470         return 0;
3471
3472 err:
3473         if (host->slot &&
3474             (mmc_can_gpio_cd(host->slot->mmc) ||
3475              !mmc_card_is_removable(host->slot->mmc)))
3476                 clk_disable_unprepare(host->biu_clk);
3477
3478         return ret;
3479 }
3480 EXPORT_SYMBOL(dw_mci_runtime_resume);
3481 #endif /* CONFIG_PM */
3482
3483 static int __init dw_mci_init(void)
3484 {
3485         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
3486         return 0;
3487 }
3488
3489 static void __exit dw_mci_exit(void)
3490 {
3491 }
3492
3493 module_init(dw_mci_init);
3494 module_exit(dw_mci_exit);
3495
3496 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
3497 MODULE_AUTHOR("NXP Semiconductor VietNam");
3498 MODULE_AUTHOR("Imagination Technologies Ltd");
3499 MODULE_LICENSE("GPL v2");