drivers/mmc/host/dw_mmc.c

   1 /*
   2  * Synopsys DesignWare Multimedia Card Interface driver
   3  *  (Based on NXP driver for lpc 31xx)
   4  *
   5  * Copyright (C) 2009 NXP Semiconductors
   6  * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/blkdev.h>
  15 #include <linux/clk.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/iopoll.h>
  23 #include <linux/ioport.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/slab.h>
  29 #include <linux/stat.h>
  30 #include <linux/delay.h>
  31 #include <linux/irq.h>
  32 #include <linux/mmc/card.h>
  33 #include <linux/mmc/host.h>
  34 #include <linux/mmc/mmc.h>
  35 #include <linux/mmc/sd.h>
  36 #include <linux/mmc/sdio.h>
  37 #include <linux/bitops.h>
  38 #include <linux/regulator/consumer.h>
  39 #include <linux/of.h>
  40 #include <linux/of_gpio.h>
  41 #include <linux/mmc/slot-gpio.h>
  42
  43 #include "dw_mmc.h"
  44
  45 /* Common flag combinations */
  46 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
  47                                  SDMMC_INT_HTO | SDMMC_INT_SBE  | \
  48                                  SDMMC_INT_EBE | SDMMC_INT_HLE)
  49 #define DW_MCI_CMD_ERROR_FLAGS  (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
  50                                  SDMMC_INT_RESP_ERR | SDMMC_INT_HLE)
  51 #define DW_MCI_ERROR_FLAGS      (DW_MCI_DATA_ERROR_FLAGS | \
  52                                  DW_MCI_CMD_ERROR_FLAGS)
  53 #define DW_MCI_SEND_STATUS      1
  54 #define DW_MCI_RECV_STATUS      2
  55 #define DW_MCI_DMA_THRESHOLD    16
  56
  57 #define DW_MCI_FREQ_MAX 200000000       /* unit: HZ */
  58 #define DW_MCI_FREQ_MIN 100000          /* unit: HZ */
  59
  60 #define IDMAC_INT_CLR           (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
  61                                  SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
  62                                  SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
  63                                  SDMMC_IDMAC_INT_TI)
  64
  65 #define DESC_RING_BUF_SZ        PAGE_SIZE
  66
  67 struct idmac_desc_64addr {
  68         u32             des0;   /* Control Descriptor */
  69 #define IDMAC_OWN_CLR64(x) \
  70         !((x) & cpu_to_le32(IDMAC_DES0_OWN))
  71
  72         u32             des1;   /* Reserved */
  73
  74         u32             des2;   /*Buffer sizes */
  75 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
  76         ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \
  77          ((cpu_to_le32(s)) & cpu_to_le32(0x1fff)))
  78
  79         u32             des3;   /* Reserved */
  80
  81         u32             des4;   /* Lower 32-bits of Buffer Address Pointer 1*/
  82         u32             des5;   /* Upper 32-bits of Buffer Address Pointer 1*/
  83
  84         u32             des6;   /* Lower 32-bits of Next Descriptor Address */
  85         u32             des7;   /* Upper 32-bits of Next Descriptor Address */
  86 };
  87
  88 struct idmac_desc {
  89         __le32          des0;   /* Control Descriptor */
  90 #define IDMAC_DES0_DIC  BIT(1)
  91 #define IDMAC_DES0_LD   BIT(2)
  92 #define IDMAC_DES0_FD   BIT(3)
  93 #define IDMAC_DES0_CH   BIT(4)
  94 #define IDMAC_DES0_ER   BIT(5)
  95 #define IDMAC_DES0_CES  BIT(30)
  96 #define IDMAC_DES0_OWN  BIT(31)
  97
  98         __le32          des1;   /* Buffer sizes */
  99 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
 100         ((d)->des1 = ((d)->des1 & cpu_to_le32(0x03ffe000)) | (cpu_to_le32((s) & 0x1fff)))
 101
 102         __le32          des2;   /* buffer 1 physical address */
 103
 104         __le32          des3;   /* buffer 2 physical address */
 105 };
 106
 107 /* Each descriptor can transfer up to 4KB of data in chained mode */
 108 #define DW_MCI_DESC_DATA_LENGTH 0x1000
 109
 110 #if defined(CONFIG_DEBUG_FS)
 111 static int dw_mci_req_show(struct seq_file *s, void *v)
 112 {
 113         struct dw_mci_slot *slot = s->private;
 114         struct mmc_request *mrq;
 115         struct mmc_command *cmd;
 116         struct mmc_command *stop;
 117         struct mmc_data *data;
 118
 119         /* Make sure we get a consistent snapshot */
 120         spin_lock_bh(&slot->host->lock);
 121         mrq = slot->mrq;
 122
 123         if (mrq) {
 124                 cmd = mrq->cmd;
 125                 data = mrq->data;
 126                 stop = mrq->stop;
 127
 128                 if (cmd)
 129                         seq_printf(s,
 130                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 131                                    cmd->opcode, cmd->arg, cmd->flags,
 132                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
 133                                    cmd->resp[2], cmd->error);
 134                 if (data)
 135                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
 136                                    data->bytes_xfered, data->blocks,
 137                                    data->blksz, data->flags, data->error);
 138                 if (stop)
 139                         seq_printf(s,
 140                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 141                                    stop->opcode, stop->arg, stop->flags,
 142                                    stop->resp[0], stop->resp[1], stop->resp[2],
 143                                    stop->resp[2], stop->error);
 144         }
 145
 146         spin_unlock_bh(&slot->host->lock);
 147
 148         return 0;
 149 }
 150
 151 static int dw_mci_req_open(struct inode *inode, struct file *file)
 152 {
 153         return single_open(file, dw_mci_req_show, inode->i_private);
 154 }
 155
 156 static const struct file_operations dw_mci_req_fops = {
 157         .owner          = THIS_MODULE,
 158         .open           = dw_mci_req_open,
 159         .read           = seq_read,
 160         .llseek         = seq_lseek,
 161         .release        = single_release,
 162 };
 163
 164 static int dw_mci_regs_show(struct seq_file *s, void *v)
 165 {
 166         struct dw_mci *host = s->private;
 167
 168         seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS));
 169         seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS));
 170         seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD));
 171         seq_printf(s, "CTRL:\t0x%08x\n", mci_readl(host, CTRL));
 172         seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK));
 173         seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA));
 174
 175         return 0;
 176 }
 177
 178 static int dw_mci_regs_open(struct inode *inode, struct file *file)
 179 {
 180         return single_open(file, dw_mci_regs_show, inode->i_private);
 181 }
 182
 183 static const struct file_operations dw_mci_regs_fops = {
 184         .owner          = THIS_MODULE,
 185         .open           = dw_mci_regs_open,
 186         .read           = seq_read,
 187         .llseek         = seq_lseek,
 188         .release        = single_release,
 189 };
 190
 191 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
 192 {
 193         struct mmc_host *mmc = slot->mmc;
 194         struct dw_mci *host = slot->host;
 195         struct dentry *root;
 196         struct dentry *node;
 197
 198         root = mmc->debugfs_root;
 199         if (!root)
 200                 return;
 201
 202         node = debugfs_create_file("regs", S_IRUSR, root, host,
 203                                    &dw_mci_regs_fops);
 204         if (!node)
 205                 goto err;
 206
 207         node = debugfs_create_file("req", S_IRUSR, root, slot,
 208                                    &dw_mci_req_fops);
 209         if (!node)
 210                 goto err;
 211
 212         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
 213         if (!node)
 214                 goto err;
 215
 216         node = debugfs_create_x32("pending_events", S_IRUSR, root,
 217                                   (u32 *)&host->pending_events);
 218         if (!node)
 219                 goto err;
 220
 221         node = debugfs_create_x32("completed_events", S_IRUSR, root,
 222                                   (u32 *)&host->completed_events);
 223         if (!node)
 224                 goto err;
 225
 226         return;
 227
 228 err:
 229         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
 230 }
 231 #endif /* defined(CONFIG_DEBUG_FS) */
 232
 233 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
 234 {
 235         u32 ctrl;
 236
 237         ctrl = mci_readl(host, CTRL);
 238         ctrl |= reset;
 239         mci_writel(host, CTRL, ctrl);
 240
 241         /* wait till resets clear */
 242         if (readl_poll_timeout_atomic(host->regs + SDMMC_CTRL, ctrl,
 243                                       !(ctrl & reset),
 244                                       1, 500 * USEC_PER_MSEC)) {
 245                 dev_err(host->dev,
 246                         "Timeout resetting block (ctrl reset %#x)\n",
 247                         ctrl & reset);
 248                 return false;
 249         }
 250
 251         return true;
 252 }
 253
 254 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags)
 255 {
 256         u32 status;
 257
 258         /*
 259          * Databook says that before issuing a new data transfer command
 260          * we need to check to see if the card is busy.  Data transfer commands
 261          * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that.
 262          *
 263          * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is
 264          * expected.
 265          */
 266         if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) &&
 267             !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) {
 268                 if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS,
 269                                               status,
 270                                               !(status & SDMMC_STATUS_BUSY),
 271                                               10, 500 * USEC_PER_MSEC))
 272                         dev_err(host->dev, "Busy; trying anyway\n");
 273         }
 274 }
 275
 276 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
 277 {
 278         struct dw_mci *host = slot->host;
 279         unsigned int cmd_status = 0;
 280
 281         mci_writel(host, CMDARG, arg);
 282         wmb(); /* drain writebuffer */
 283         dw_mci_wait_while_busy(host, cmd);
 284         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
 285
 286         if (readl_poll_timeout_atomic(host->regs + SDMMC_CMD, cmd_status,
 287                                       !(cmd_status & SDMMC_CMD_START),
 288                                       1, 500 * USEC_PER_MSEC))
 289                 dev_err(&slot->mmc->class_dev,
 290                         "Timeout sending command (cmd %#x arg %#x status %#x)\n",
 291                         cmd, arg, cmd_status);
 292 }
 293
 294 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
 295 {
 296         struct dw_mci_slot *slot = mmc_priv(mmc);
 297         struct dw_mci *host = slot->host;
 298         u32 cmdr;
 299
 300         cmd->error = -EINPROGRESS;
 301         cmdr = cmd->opcode;
 302
 303         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
 304             cmd->opcode == MMC_GO_IDLE_STATE ||
 305             cmd->opcode == MMC_GO_INACTIVE_STATE ||
 306             (cmd->opcode == SD_IO_RW_DIRECT &&
 307              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
 308                 cmdr |= SDMMC_CMD_STOP;
 309         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
 310                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
 311
 312         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
 313                 u32 clk_en_a;
 314
 315                 /* Special bit makes CMD11 not die */
 316                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
 317
 318                 /* Change state to continue to handle CMD11 weirdness */
 319                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
 320                 slot->host->state = STATE_SENDING_CMD11;
 321
 322                 /*
 323                  * We need to disable low power mode (automatic clock stop)
 324                  * while doing voltage switch so we don't confuse the card,
 325                  * since stopping the clock is a specific part of the UHS
 326                  * voltage change dance.
 327                  *
 328                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
 329                  * unconditionally turned back on in dw_mci_setup_bus() if it's
 330                  * ever called with a non-zero clock.  That shouldn't happen
 331                  * until the voltage change is all done.
 332                  */
 333                 clk_en_a = mci_readl(host, CLKENA);
 334                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
 335                 mci_writel(host, CLKENA, clk_en_a);
 336                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
 337                              SDMMC_CMD_PRV_DAT_WAIT, 0);
 338         }
 339
 340         if (cmd->flags & MMC_RSP_PRESENT) {
 341                 /* We expect a response, so set this bit */
 342                 cmdr |= SDMMC_CMD_RESP_EXP;
 343                 if (cmd->flags & MMC_RSP_136)
 344                         cmdr |= SDMMC_CMD_RESP_LONG;
 345         }
 346
 347         if (cmd->flags & MMC_RSP_CRC)
 348                 cmdr |= SDMMC_CMD_RESP_CRC;
 349
 350         if (cmd->data) {
 351                 cmdr |= SDMMC_CMD_DAT_EXP;
 352                 if (cmd->data->flags & MMC_DATA_WRITE)
 353                         cmdr |= SDMMC_CMD_DAT_WR;
 354         }
 355
 356         if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags))
 357                 cmdr |= SDMMC_CMD_USE_HOLD_REG;
 358
 359         return cmdr;
 360 }
 361
 362 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
 363 {
 364         struct mmc_command *stop;
 365         u32 cmdr;
 366
 367         if (!cmd->data)
 368                 return 0;
 369
 370         stop = &host->stop_abort;
 371         cmdr = cmd->opcode;
 372         memset(stop, 0, sizeof(struct mmc_command));
 373
 374         if (cmdr == MMC_READ_SINGLE_BLOCK ||
 375             cmdr == MMC_READ_MULTIPLE_BLOCK ||
 376             cmdr == MMC_WRITE_BLOCK ||
 377             cmdr == MMC_WRITE_MULTIPLE_BLOCK ||
 378             cmdr == MMC_SEND_TUNING_BLOCK ||
 379             cmdr == MMC_SEND_TUNING_BLOCK_HS200) {
 380                 stop->opcode = MMC_STOP_TRANSMISSION;
 381                 stop->arg = 0;
 382                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
 383         } else if (cmdr == SD_IO_RW_EXTENDED) {
 384                 stop->opcode = SD_IO_RW_DIRECT;
 385                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
 386                              ((cmd->arg >> 28) & 0x7);
 387                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
 388         } else {
 389                 return 0;
 390         }
 391
 392         cmdr = stop->opcode | SDMMC_CMD_STOP |
 393                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
 394
 395         if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &host->slot->flags))
 396                 cmdr |= SDMMC_CMD_USE_HOLD_REG;
 397
 398         return cmdr;
 399 }
 400
 401 static inline void dw_mci_set_cto(struct dw_mci *host)
 402 {
 403         unsigned int cto_clks;
 404         unsigned int cto_div;
 405         unsigned int cto_ms;
 406         unsigned long irqflags;
 407
 408         cto_clks = mci_readl(host, TMOUT) & 0xff;
 409         cto_div = (mci_readl(host, CLKDIV) & 0xff) * 2;
 410         if (cto_div == 0)
 411                 cto_div = 1;
 412         cto_ms = DIV_ROUND_UP(MSEC_PER_SEC * cto_clks * cto_div, host->bus_hz);
 413
 414         /* add a bit spare time */
 415         cto_ms += 10;
 416
 417         /*
 418          * The durations we're working with are fairly short so we have to be
 419          * extra careful about synchronization here.  Specifically in hardware a
 420          * command timeout is _at most_ 5.1 ms, so that means we expect an
 421          * interrupt (either command done or timeout) to come rather quickly
 422          * after the mci_writel.  ...but just in case we have a long interrupt
 423          * latency let's add a bit of paranoia.
 424          *
 425          * In general we'll assume that at least an interrupt will be asserted
 426          * in hardware by the time the cto_timer runs.  ...and if it hasn't
 427          * been asserted in hardware by that time then we'll assume it'll never
 428          * come.
 429          */
 430         spin_lock_irqsave(&host->irq_lock, irqflags);
 431         if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
 432                 mod_timer(&host->cto_timer,
 433                         jiffies + msecs_to_jiffies(cto_ms) + 1);
 434         spin_unlock_irqrestore(&host->irq_lock, irqflags);
 435 }
 436
 437 static void dw_mci_start_command(struct dw_mci *host,
 438                                  struct mmc_command *cmd, u32 cmd_flags)
 439 {
 440         host->cmd = cmd;
 441         dev_vdbg(host->dev,
 442                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
 443                  cmd->arg, cmd_flags);
 444
 445         mci_writel(host, CMDARG, cmd->arg);
 446         wmb(); /* drain writebuffer */
 447         dw_mci_wait_while_busy(host, cmd_flags);
 448
 449         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
 450
 451         /* response expected command only */
 452         if (cmd_flags & SDMMC_CMD_RESP_EXP)
 453                 dw_mci_set_cto(host);
 454 }
 455
 456 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
 457 {
 458         struct mmc_command *stop = &host->stop_abort;
 459
 460         dw_mci_start_command(host, stop, host->stop_cmdr);
 461 }
 462
 463 /* DMA interface functions */
 464 static void dw_mci_stop_dma(struct dw_mci *host)
 465 {
 466         if (host->using_dma) {
 467                 host->dma_ops->stop(host);
 468                 host->dma_ops->cleanup(host);
 469         }
 470
 471         /* Data transfer was stopped by the interrupt handler */
 472         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
 473 }
 474
 475 static void dw_mci_dma_cleanup(struct dw_mci *host)
 476 {
 477         struct mmc_data *data = host->data;
 478
 479         if (data && data->host_cookie == COOKIE_MAPPED) {
 480                 dma_unmap_sg(host->dev,
 481                              data->sg,
 482                              data->sg_len,
 483                              mmc_get_dma_dir(data));
 484                 data->host_cookie = COOKIE_UNMAPPED;
 485         }
 486 }
 487
 488 static void dw_mci_idmac_reset(struct dw_mci *host)
 489 {
 490         u32 bmod = mci_readl(host, BMOD);
 491         /* Software reset of DMA */
 492         bmod |= SDMMC_IDMAC_SWRESET;
 493         mci_writel(host, BMOD, bmod);
 494 }
 495
 496 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
 497 {
 498         u32 temp;
 499
 500         /* Disable and reset the IDMAC interface */
 501         temp = mci_readl(host, CTRL);
 502         temp &= ~SDMMC_CTRL_USE_IDMAC;
 503         temp |= SDMMC_CTRL_DMA_RESET;
 504         mci_writel(host, CTRL, temp);
 505
 506         /* Stop the IDMAC running */
 507         temp = mci_readl(host, BMOD);
 508         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
 509         temp |= SDMMC_IDMAC_SWRESET;
 510         mci_writel(host, BMOD, temp);
 511 }
 512
 513 static void dw_mci_dmac_complete_dma(void *arg)
 514 {
 515         struct dw_mci *host = arg;
 516         struct mmc_data *data = host->data;
 517
 518         dev_vdbg(host->dev, "DMA complete\n");
 519
 520         if ((host->use_dma == TRANS_MODE_EDMAC) &&
 521             data && (data->flags & MMC_DATA_READ))
 522                 /* Invalidate cache after read */
 523                 dma_sync_sg_for_cpu(mmc_dev(host->slot->mmc),
 524                                     data->sg,
 525                                     data->sg_len,
 526                                     DMA_FROM_DEVICE);
 527
 528         host->dma_ops->cleanup(host);
 529
 530         /*
 531          * If the card was removed, data will be NULL. No point in trying to
 532          * send the stop command or waiting for NBUSY in this case.
 533          */
 534         if (data) {
 535                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
 536                 tasklet_schedule(&host->tasklet);
 537         }
 538 }
 539
 540 static int dw_mci_idmac_init(struct dw_mci *host)
 541 {
 542         int i;
 543
 544         if (host->dma_64bit_address == 1) {
 545                 struct idmac_desc_64addr *p;
 546                 /* Number of descriptors in the ring buffer */
 547                 host->ring_size =
 548                         DESC_RING_BUF_SZ / sizeof(struct idmac_desc_64addr);
 549
 550                 /* Forward link the descriptor list */
 551                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
 552                                                                 i++, p++) {
 553                         p->des6 = (host->sg_dma +
 554                                         (sizeof(struct idmac_desc_64addr) *
 555                                                         (i + 1))) & 0xffffffff;
 556
 557                         p->des7 = (u64)(host->sg_dma +
 558                                         (sizeof(struct idmac_desc_64addr) *
 559                                                         (i + 1))) >> 32;
 560                         /* Initialize reserved and buffer size fields to "0" */
 561                         p->des1 = 0;
 562                         p->des2 = 0;
 563                         p->des3 = 0;
 564                 }
 565
 566                 /* Set the last descriptor as the end-of-ring descriptor */
 567                 p->des6 = host->sg_dma & 0xffffffff;
 568                 p->des7 = (u64)host->sg_dma >> 32;
 569                 p->des0 = IDMAC_DES0_ER;
 570
 571         } else {
 572                 struct idmac_desc *p;
 573                 /* Number of descriptors in the ring buffer */
 574                 host->ring_size =
 575                         DESC_RING_BUF_SZ / sizeof(struct idmac_desc);
 576
 577                 /* Forward link the descriptor list */
 578                 for (i = 0, p = host->sg_cpu;
 579                      i < host->ring_size - 1;
 580                      i++, p++) {
 581                         p->des3 = cpu_to_le32(host->sg_dma +
 582                                         (sizeof(struct idmac_desc) * (i + 1)));
 583                         p->des1 = 0;
 584                 }
 585
 586                 /* Set the last descriptor as the end-of-ring descriptor */
 587                 p->des3 = cpu_to_le32(host->sg_dma);
 588                 p->des0 = cpu_to_le32(IDMAC_DES0_ER);
 589         }
 590
 591         dw_mci_idmac_reset(host);
 592
 593         if (host->dma_64bit_address == 1) {
 594                 /* Mask out interrupts - get Tx & Rx complete only */
 595                 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
 596                 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
 597                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
 598
 599                 /* Set the descriptor base address */
 600                 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
 601                 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
 602
 603         } else {
 604                 /* Mask out interrupts - get Tx & Rx complete only */
 605                 mci_writel(host, IDSTS, IDMAC_INT_CLR);
 606                 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
 607                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
 608
 609                 /* Set the descriptor base address */
 610                 mci_writel(host, DBADDR, host->sg_dma);
 611         }
 612
 613         return 0;
 614 }
 615
 616 static inline int dw_mci_prepare_desc64(struct dw_mci *host,
 617                                          struct mmc_data *data,
 618                                          unsigned int sg_len)
 619 {
 620         unsigned int desc_len;
 621         struct idmac_desc_64addr *desc_first, *desc_last, *desc;
 622         u32 val;
 623         int i;
 624
 625         desc_first = desc_last = desc = host->sg_cpu;
 626
 627         for (i = 0; i < sg_len; i++) {
 628                 unsigned int length = sg_dma_len(&data->sg[i]);
 629
 630                 u64 mem_addr = sg_dma_address(&data->sg[i]);
 631
 632                 for ( ; length ; desc++) {
 633                         desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
 634                                    length : DW_MCI_DESC_DATA_LENGTH;
 635
 636                         length -= desc_len;
 637
 638                         /*
 639                          * Wait for the former clear OWN bit operation
 640                          * of IDMAC to make sure that this descriptor
 641                          * isn't still owned by IDMAC as IDMAC's write
 642                          * ops and CPU's read ops are asynchronous.
 643                          */
 644                         if (readl_poll_timeout_atomic(&desc->des0, val,
 645                                                 !(val & IDMAC_DES0_OWN),
 646                                                 10, 100 * USEC_PER_MSEC))
 647                                 goto err_own_bit;
 648
 649                         /*
 650                          * Set the OWN bit and disable interrupts
 651                          * for this descriptor
 652                          */
 653                         desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
 654                                                 IDMAC_DES0_CH;
 655
 656                         /* Buffer length */
 657                         IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len);
 658
 659                         /* Physical address to DMA to/from */
 660                         desc->des4 = mem_addr & 0xffffffff;
 661                         desc->des5 = mem_addr >> 32;
 662
 663                         /* Update physical address for the next desc */
 664                         mem_addr += desc_len;
 665
 666                         /* Save pointer to the last descriptor */
 667                         desc_last = desc;
 668                 }
 669         }
 670
 671         /* Set first descriptor */
 672         desc_first->des0 |= IDMAC_DES0_FD;
 673
 674         /* Set last descriptor */
 675         desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
 676         desc_last->des0 |= IDMAC_DES0_LD;
 677
 678         return 0;
 679 err_own_bit:
 680         /* restore the descriptor chain as it's polluted */
 681         dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n");
 682         memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
 683         dw_mci_idmac_init(host);
 684         return -EINVAL;
 685 }
 686
 687
 688 static inline int dw_mci_prepare_desc32(struct dw_mci *host,
 689                                          struct mmc_data *data,
 690                                          unsigned int sg_len)
 691 {
 692         unsigned int desc_len;
 693         struct idmac_desc *desc_first, *desc_last, *desc;
 694         u32 val;
 695         int i;
 696
 697         desc_first = desc_last = desc = host->sg_cpu;
 698
 699         for (i = 0; i < sg_len; i++) {
 700                 unsigned int length = sg_dma_len(&data->sg[i]);
 701
 702                 u32 mem_addr = sg_dma_address(&data->sg[i]);
 703
 704                 for ( ; length ; desc++) {
 705                         desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
 706                                    length : DW_MCI_DESC_DATA_LENGTH;
 707
 708                         length -= desc_len;
 709
 710                         /*
 711                          * Wait for the former clear OWN bit operation
 712                          * of IDMAC to make sure that this descriptor
 713                          * isn't still owned by IDMAC as IDMAC's write
 714                          * ops and CPU's read ops are asynchronous.
 715                          */
 716                         if (readl_poll_timeout_atomic(&desc->des0, val,
 717                                                       IDMAC_OWN_CLR64(val),
 718                                                       10,
 719                                                       100 * USEC_PER_MSEC))
 720                                 goto err_own_bit;
 721
 722                         /*
 723                          * Set the OWN bit and disable interrupts
 724                          * for this descriptor
 725                          */
 726                         desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
 727                                                  IDMAC_DES0_DIC |
 728                                                  IDMAC_DES0_CH);
 729
 730                         /* Buffer length */
 731                         IDMAC_SET_BUFFER1_SIZE(desc, desc_len);
 732
 733                         /* Physical address to DMA to/from */
 734                         desc->des2 = cpu_to_le32(mem_addr);
 735
 736                         /* Update physical address for the next desc */
 737                         mem_addr += desc_len;
 738
 739                         /* Save pointer to the last descriptor */
 740                         desc_last = desc;
 741                 }
 742         }
 743
 744         /* Set first descriptor */
 745         desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD);
 746
 747         /* Set last descriptor */
 748         desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
 749                                        IDMAC_DES0_DIC));
 750         desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
 751
 752         return 0;
 753 err_own_bit:
 754         /* restore the descriptor chain as it's polluted */
 755         dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n");
 756         memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
 757         dw_mci_idmac_init(host);
 758         return -EINVAL;
 759 }
 760
 761 static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
 762 {
 763         u32 temp;
 764         int ret;
 765
 766         if (host->dma_64bit_address == 1)
 767                 ret = dw_mci_prepare_desc64(host, host->data, sg_len);
 768         else
 769                 ret = dw_mci_prepare_desc32(host, host->data, sg_len);
 770
 771         if (ret)
 772                 goto out;
 773
 774         /* drain writebuffer */
 775         wmb();
 776
 777         /* Make sure to reset DMA in case we did PIO before this */
 778         dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
 779         dw_mci_idmac_reset(host);
 780
 781         /* Select IDMAC interface */
 782         temp = mci_readl(host, CTRL);
 783         temp |= SDMMC_CTRL_USE_IDMAC;
 784         mci_writel(host, CTRL, temp);
 785
 786         /* drain writebuffer */
 787         wmb();
 788
 789         /* Enable the IDMAC */
 790         temp = mci_readl(host, BMOD);
 791         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
 792         mci_writel(host, BMOD, temp);
 793
 794         /* Start it running */
 795         mci_writel(host, PLDMND, 1);
 796
 797 out:
 798         return ret;
 799 }
 800
 801 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
 802         .init = dw_mci_idmac_init,
 803         .start = dw_mci_idmac_start_dma,
 804         .stop = dw_mci_idmac_stop_dma,
 805         .complete = dw_mci_dmac_complete_dma,
 806         .cleanup = dw_mci_dma_cleanup,
 807 };
 808
 809 static void dw_mci_edmac_stop_dma(struct dw_mci *host)
 810 {
 811         dmaengine_terminate_async(host->dms->ch);
 812 }
 813
 814 static int dw_mci_edmac_start_dma(struct dw_mci *host,
 815                                             unsigned int sg_len)
 816 {
 817         struct dma_slave_config cfg;
 818         struct dma_async_tx_descriptor *desc = NULL;
 819         struct scatterlist *sgl = host->data->sg;
 820         static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
 821         u32 sg_elems = host->data->sg_len;
 822         u32 fifoth_val;
 823         u32 fifo_offset = host->fifo_reg - host->regs;
 824         int ret = 0;
 825
 826         /* Set external dma config: burst size, burst width */
 827         cfg.dst_addr = host->phy_regs + fifo_offset;
 828         cfg.src_addr = cfg.dst_addr;
 829         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 830         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 831
 832         /* Match burst msize with external dma config */
 833         fifoth_val = mci_readl(host, FIFOTH);
 834         cfg.dst_maxburst = mszs[(fifoth_val >> 28) & 0x7];
 835         cfg.src_maxburst = cfg.dst_maxburst;
 836
 837         if (host->data->flags & MMC_DATA_WRITE)
 838                 cfg.direction = DMA_MEM_TO_DEV;
 839         else
 840                 cfg.direction = DMA_DEV_TO_MEM;
 841
 842         ret = dmaengine_slave_config(host->dms->ch, &cfg);
 843         if (ret) {
 844                 dev_err(host->dev, "Failed to config edmac.\n");
 845                 return -EBUSY;
 846         }
 847
 848         desc = dmaengine_prep_slave_sg(host->dms->ch, sgl,
 849                                        sg_len, cfg.direction,
 850                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 851         if (!desc) {
 852                 dev_err(host->dev, "Can't prepare slave sg.\n");
 853                 return -EBUSY;
 854         }
 855
 856         /* Set dw_mci_dmac_complete_dma as callback */
 857         desc->callback = dw_mci_dmac_complete_dma;
 858         desc->callback_param = (void *)host;
 859         dmaengine_submit(desc);
 860
 861         /* Flush cache before write */
 862         if (host->data->flags & MMC_DATA_WRITE)
 863                 dma_sync_sg_for_device(mmc_dev(host->slot->mmc), sgl,
 864                                        sg_elems, DMA_TO_DEVICE);
 865
 866         dma_async_issue_pending(host->dms->ch);
 867
 868         return 0;
 869 }
 870
 871 static int dw_mci_edmac_init(struct dw_mci *host)
 872 {
 873         /* Request external dma channel */
 874         host->dms = kzalloc(sizeof(struct dw_mci_dma_slave), GFP_KERNEL);
 875         if (!host->dms)
 876                 return -ENOMEM;
 877
 878         host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
 879         if (!host->dms->ch) {
 880                 dev_err(host->dev, "Failed to get external DMA channel.\n");
 881                 kfree(host->dms);
 882                 host->dms = NULL;
 883                 return -ENXIO;
 884         }
 885
 886         return 0;
 887 }
 888
 889 static void dw_mci_edmac_exit(struct dw_mci *host)
 890 {
 891         if (host->dms) {
 892                 if (host->dms->ch) {
 893                         dma_release_channel(host->dms->ch);
 894                         host->dms->ch = NULL;
 895                 }
 896                 kfree(host->dms);
 897                 host->dms = NULL;
 898         }
 899 }
 900
 901 static const struct dw_mci_dma_ops dw_mci_edmac_ops = {
 902         .init = dw_mci_edmac_init,
 903         .exit = dw_mci_edmac_exit,
 904         .start = dw_mci_edmac_start_dma,
 905         .stop = dw_mci_edmac_stop_dma,
 906         .complete = dw_mci_dmac_complete_dma,
 907         .cleanup = dw_mci_dma_cleanup,
 908 };
 909
 910 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
 911                                    struct mmc_data *data,
 912                                    int cookie)
 913 {
 914         struct scatterlist *sg;
 915         unsigned int i, sg_len;
 916
 917         if (data->host_cookie == COOKIE_PRE_MAPPED)
 918                 return data->sg_len;
 919
 920         /*
 921          * We don't do DMA on "complex" transfers, i.e. with
 922          * non-word-aligned buffers or lengths. Also, we don't bother
 923          * with all the DMA setup overhead for short transfers.
 924          */
 925         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
 926                 return -EINVAL;
 927
 928         if (data->blksz & 3)
 929                 return -EINVAL;
 930
 931         for_each_sg(data->sg, sg, data->sg_len, i) {
 932                 if (sg->offset & 3 || sg->length & 3)
 933                         return -EINVAL;
 934         }
 935
 936         sg_len = dma_map_sg(host->dev,
 937                             data->sg,
 938                             data->sg_len,
 939                             mmc_get_dma_dir(data));
 940         if (sg_len == 0)
 941                 return -EINVAL;
 942
 943         data->host_cookie = cookie;
 944
 945         return sg_len;
 946 }
 947
 948 static void dw_mci_pre_req(struct mmc_host *mmc,
 949                            struct mmc_request *mrq)
 950 {
 951         struct dw_mci_slot *slot = mmc_priv(mmc);
 952         struct mmc_data *data = mrq->data;
 953
 954         if (!slot->host->use_dma || !data)
 955                 return;
 956
 957         /* This data might be unmapped at this time */
 958         data->host_cookie = COOKIE_UNMAPPED;
 959
 960         if (dw_mci_pre_dma_transfer(slot->host, mrq->data,
 961                                 COOKIE_PRE_MAPPED) < 0)
 962                 data->host_cookie = COOKIE_UNMAPPED;
 963 }
 964
 965 static void dw_mci_post_req(struct mmc_host *mmc,
 966                             struct mmc_request *mrq,
 967                             int err)
 968 {
 969         struct dw_mci_slot *slot = mmc_priv(mmc);
 970         struct mmc_data *data = mrq->data;
 971
 972         if (!slot->host->use_dma || !data)
 973                 return;
 974
 975         if (data->host_cookie != COOKIE_UNMAPPED)
 976                 dma_unmap_sg(slot->host->dev,
 977                              data->sg,
 978                              data->sg_len,
 979                              mmc_get_dma_dir(data));
 980         data->host_cookie = COOKIE_UNMAPPED;
 981 }
 982
 983 static int dw_mci_get_cd(struct mmc_host *mmc)
 984 {
 985         int present;
 986         struct dw_mci_slot *slot = mmc_priv(mmc);
 987         struct dw_mci *host = slot->host;
 988         int gpio_cd = mmc_gpio_get_cd(mmc);
 989
 990         /* Use platform get_cd function, else try onboard card detect */
 991         if (((mmc->caps & MMC_CAP_NEEDS_POLL)
 992                                 || !mmc_card_is_removable(mmc))) {
 993                 present = 1;
 994
 995                 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
 996                         if (mmc->caps & MMC_CAP_NEEDS_POLL) {
 997                                 dev_info(&mmc->class_dev,
 998                                         "card is polling.\n");
 999                         } else {
1000                                 dev_info(&mmc->class_dev,
1001                                         "card is non-removable.\n");
1002                         }
1003                         set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1004                 }
1005
1006                 return present;
1007         } else if (gpio_cd >= 0)
1008                 present = gpio_cd;
1009         else
1010                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1011                         == 0 ? 1 : 0;
1012
1013         spin_lock_bh(&host->lock);
1014         if (present && !test_and_set_bit(DW_MMC_CARD_PRESENT, &slot->flags))
1015                 dev_dbg(&mmc->class_dev, "card is present\n");
1016         else if (!present &&
1017                         !test_and_clear_bit(DW_MMC_CARD_PRESENT, &slot->flags))
1018                 dev_dbg(&mmc->class_dev, "card is not present\n");
1019         spin_unlock_bh(&host->lock);
1020
1021         return present;
1022 }
1023
1024 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
1025 {
1026         unsigned int blksz = data->blksz;
1027         static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
1028         u32 fifo_width = 1 << host->data_shift;
1029         u32 blksz_depth = blksz / fifo_width, fifoth_val;
1030         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
1031         int idx = ARRAY_SIZE(mszs) - 1;
1032
1033         /* pio should ship this scenario */
1034         if (!host->use_dma)
1035                 return;
1036
1037         tx_wmark = (host->fifo_depth) / 2;
1038         tx_wmark_invers = host->fifo_depth - tx_wmark;
1039
1040         /*
1041          * MSIZE is '1',
1042          * if blksz is not a multiple of the FIFO width
1043          */
1044         if (blksz % fifo_width)
1045                 goto done;
1046
1047         do {
1048                 if (!((blksz_depth % mszs[idx]) ||
1049                      (tx_wmark_invers % mszs[idx]))) {
1050                         msize = idx;
1051                         rx_wmark = mszs[idx] - 1;
1052                         break;
1053                 }
1054         } while (--idx > 0);
1055         /*
1056          * If idx is '0', it won't be tried
1057          * Thus, initial values are uesed
1058          */
1059 done:
1060         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
1061         mci_writel(host, FIFOTH, fifoth_val);
1062 }
1063
1064 static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data)
1065 {
1066         unsigned int blksz = data->blksz;
1067         u32 blksz_depth, fifo_depth;
1068         u16 thld_size;
1069         u8 enable;
1070
1071         /*
1072          * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
1073          * in the FIFO region, so we really shouldn't access it).
1074          */
1075         if (host->verid < DW_MMC_240A ||
1076                 (host->verid < DW_MMC_280A && data->flags & MMC_DATA_WRITE))
1077                 return;
1078
1079         /*
1080          * Card write Threshold is introduced since 2.80a
1081          * It's used when HS400 mode is enabled.
1082          */
1083         if (data->flags & MMC_DATA_WRITE &&
1084                 !(host->timing != MMC_TIMING_MMC_HS400))
1085                 return;
1086
1087         if (data->flags & MMC_DATA_WRITE)
1088                 enable = SDMMC_CARD_WR_THR_EN;
1089         else
1090                 enable = SDMMC_CARD_RD_THR_EN;
1091
1092         if (host->timing != MMC_TIMING_MMC_HS200 &&
1093             host->timing != MMC_TIMING_UHS_SDR104)
1094                 goto disable;
1095
1096         blksz_depth = blksz / (1 << host->data_shift);
1097         fifo_depth = host->fifo_depth;
1098
1099         if (blksz_depth > fifo_depth)
1100                 goto disable;
1101
1102         /*
1103          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
1104          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
1105          * Currently just choose blksz.
1106          */
1107         thld_size = blksz;
1108         mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(thld_size, enable));
1109         return;
1110
1111 disable:
1112         mci_writel(host, CDTHRCTL, 0);
1113 }
1114
1115 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
1116 {
1117         unsigned long irqflags;
1118         int sg_len;
1119         u32 temp;
1120
1121         host->using_dma = 0;
1122
1123         /* If we don't have a channel, we can't do DMA */
1124         if (!host->use_dma)
1125                 return -ENODEV;
1126
1127         sg_len = dw_mci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1128         if (sg_len < 0) {
1129                 host->dma_ops->stop(host);
1130                 return sg_len;
1131         }
1132
1133         host->using_dma = 1;
1134
1135         if (host->use_dma == TRANS_MODE_IDMAC)
1136                 dev_vdbg(host->dev,
1137                          "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
1138                          (unsigned long)host->sg_cpu,
1139                          (unsigned long)host->sg_dma,
1140                          sg_len);
1141
1142         /*
1143          * Decide the MSIZE and RX/TX Watermark.
1144          * If current block size is same with previous size,
1145          * no need to update fifoth.
1146          */
1147         if (host->prev_blksz != data->blksz)
1148                 dw_mci_adjust_fifoth(host, data);
1149
1150         /* Enable the DMA interface */
1151         temp = mci_readl(host, CTRL);
1152         temp |= SDMMC_CTRL_DMA_ENABLE;
1153         mci_writel(host, CTRL, temp);
1154
1155         /* Disable RX/TX IRQs, let DMA handle it */
1156         spin_lock_irqsave(&host->irq_lock, irqflags);
1157         temp = mci_readl(host, INTMASK);
1158         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
1159         mci_writel(host, INTMASK, temp);
1160         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1161
1162         if (host->dma_ops->start(host, sg_len)) {
1163                 host->dma_ops->stop(host);
1164                 /* We can't do DMA, try PIO for this one */
1165                 dev_dbg(host->dev,
1166                         "%s: fall back to PIO mode for current transfer\n",
1167                         __func__);
1168                 return -ENODEV;
1169         }
1170
1171         return 0;
1172 }
1173
1174 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
1175 {
1176         unsigned long irqflags;
1177         int flags = SG_MITER_ATOMIC;
1178         u32 temp;
1179
1180         data->error = -EINPROGRESS;
1181
1182         WARN_ON(host->data);
1183         host->sg = NULL;
1184         host->data = data;
1185
1186         if (data->flags & MMC_DATA_READ)
1187                 host->dir_status = DW_MCI_RECV_STATUS;
1188         else
1189                 host->dir_status = DW_MCI_SEND_STATUS;
1190
1191         dw_mci_ctrl_thld(host, data);
1192
1193         if (dw_mci_submit_data_dma(host, data)) {
1194                 if (host->data->flags & MMC_DATA_READ)
1195                         flags |= SG_MITER_TO_SG;
1196                 else
1197                         flags |= SG_MITER_FROM_SG;
1198
1199                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1200                 host->sg = data->sg;
1201                 host->part_buf_start = 0;
1202                 host->part_buf_count = 0;
1203
1204                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
1205
1206                 spin_lock_irqsave(&host->irq_lock, irqflags);
1207                 temp = mci_readl(host, INTMASK);
1208                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
1209                 mci_writel(host, INTMASK, temp);
1210                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1211
1212                 temp = mci_readl(host, CTRL);
1213                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
1214                 mci_writel(host, CTRL, temp);
1215
1216                 /*
1217                  * Use the initial fifoth_val for PIO mode. If wm_algined
1218                  * is set, we set watermark same as data size.
1219                  * If next issued data may be transfered by DMA mode,
1220                  * prev_blksz should be invalidated.
1221                  */
1222                 if (host->wm_aligned)
1223                         dw_mci_adjust_fifoth(host, data);
1224                 else
1225                         mci_writel(host, FIFOTH, host->fifoth_val);
1226                 host->prev_blksz = 0;
1227         } else {
1228                 /*
1229                  * Keep the current block size.
1230                  * It will be used to decide whether to update
1231                  * fifoth register next time.
1232                  */
1233                 host->prev_blksz = data->blksz;
1234         }
1235 }
1236
1237 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
1238 {
1239         struct dw_mci *host = slot->host;
1240         unsigned int clock = slot->clock;
1241         u32 div;
1242         u32 clk_en_a;
1243         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
1244
1245         /* We must continue to set bit 28 in CMD until the change is complete */
1246         if (host->state == STATE_WAITING_CMD11_DONE)
1247                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
1248
1249         if (!clock) {
1250                 mci_writel(host, CLKENA, 0);
1251                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1252         } else if (clock != host->current_speed || force_clkinit) {
1253                 div = host->bus_hz / clock;
1254                 if (host->bus_hz % clock && host->bus_hz > clock)
1255                         /*
1256                          * move the + 1 after the divide to prevent
1257                          * over-clocking the card.
1258                          */
1259                         div += 1;
1260
1261                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
1262
1263                 if ((clock != slot->__clk_old &&
1264                         !test_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags)) ||
1265                         force_clkinit) {
1266                         /* Silent the verbose log if calling from PM context */
1267                         if (!force_clkinit)
1268                                 dev_info(&slot->mmc->class_dev,
1269                                          "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
1270                                          slot->id, host->bus_hz, clock,
1271                                          div ? ((host->bus_hz / div) >> 1) :
1272                                          host->bus_hz, div);
1273
1274                         /*
1275                          * If card is polling, display the message only
1276                          * one time at boot time.
1277                          */
1278                         if (slot->mmc->caps & MMC_CAP_NEEDS_POLL &&
1279                                         slot->mmc->f_min == clock)
1280                                 set_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags);
1281                 }
1282
1283                 /* disable clock */
1284                 mci_writel(host, CLKENA, 0);
1285                 mci_writel(host, CLKSRC, 0);
1286
1287                 /* inform CIU */
1288                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1289
1290                 /* set clock to desired speed */
1291                 mci_writel(host, CLKDIV, div);
1292
1293                 /* inform CIU */
1294                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1295
1296                 /* enable clock; only low power if no SDIO */
1297                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
1298                 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags))
1299                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
1300                 mci_writel(host, CLKENA, clk_en_a);
1301
1302                 /* inform CIU */
1303                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1304
1305                 /* keep the last clock value that was requested from core */
1306                 slot->__clk_old = clock;
1307         }
1308
1309         host->current_speed = clock;
1310
1311         /* Set the current slot bus width */
1312         mci_writel(host, CTYPE, (slot->ctype << slot->id));
1313 }
1314
1315 static void __dw_mci_start_request(struct dw_mci *host,
1316                                    struct dw_mci_slot *slot,
1317                                    struct mmc_command *cmd)
1318 {
1319         struct mmc_request *mrq;
1320         struct mmc_data *data;
1321         u32 cmdflags;
1322
1323         mrq = slot->mrq;
1324
1325         host->mrq = mrq;
1326
1327         host->pending_events = 0;
1328         host->completed_events = 0;
1329         host->cmd_status = 0;
1330         host->data_status = 0;
1331         host->dir_status = 0;
1332
1333         data = cmd->data;
1334         if (data) {
1335                 mci_writel(host, TMOUT, 0xFFFFFFFF);
1336                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
1337                 mci_writel(host, BLKSIZ, data->blksz);
1338         }
1339
1340         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
1341
1342         /* this is the first command, send the initialization clock */
1343         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
1344                 cmdflags |= SDMMC_CMD_INIT;
1345
1346         if (data) {
1347                 dw_mci_submit_data(host, data);
1348                 wmb(); /* drain writebuffer */
1349         }
1350
1351         dw_mci_start_command(host, cmd, cmdflags);
1352
1353         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
1354                 unsigned long irqflags;
1355
1356                 /*
1357                  * Databook says to fail after 2ms w/ no response, but evidence
1358                  * shows that sometimes the cmd11 interrupt takes over 130ms.
1359                  * We'll set to 500ms, plus an extra jiffy just in case jiffies
1360                  * is just about to roll over.
1361                  *
1362                  * We do this whole thing under spinlock and only if the
1363                  * command hasn't already completed (indicating the the irq
1364                  * already ran so we don't want the timeout).
1365                  */
1366                 spin_lock_irqsave(&host->irq_lock, irqflags);
1367                 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1368                         mod_timer(&host->cmd11_timer,
1369                                 jiffies + msecs_to_jiffies(500) + 1);
1370                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1371         }
1372
1373         host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
1374 }
1375
1376 static void dw_mci_start_request(struct dw_mci *host,
1377                                  struct dw_mci_slot *slot)
1378 {
1379         struct mmc_request *mrq = slot->mrq;
1380         struct mmc_command *cmd;
1381
1382         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
1383         __dw_mci_start_request(host, slot, cmd);
1384 }
1385
1386 /* must be called with host->lock held */
1387 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1388                                  struct mmc_request *mrq)
1389 {
1390         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1391                  host->state);
1392
1393         slot->mrq = mrq;
1394
1395         if (host->state == STATE_WAITING_CMD11_DONE) {
1396                 dev_warn(&slot->mmc->class_dev,
1397                          "Voltage change didn't complete\n");
1398                 /*
1399                  * this case isn't expected to happen, so we can
1400                  * either crash here or just try to continue on
1401                  * in the closest possible state
1402                  */
1403                 host->state = STATE_IDLE;
1404         }
1405
1406         if (host->state == STATE_IDLE) {
1407                 host->state = STATE_SENDING_CMD;
1408                 dw_mci_start_request(host, slot);
1409         } else {
1410                 list_add_tail(&slot->queue_node, &host->queue);
1411         }
1412 }
1413
1414 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1415 {
1416         struct dw_mci_slot *slot = mmc_priv(mmc);
1417         struct dw_mci *host = slot->host;
1418
1419         WARN_ON(slot->mrq);
1420
1421         /*
1422          * The check for card presence and queueing of the request must be
1423          * atomic, otherwise the card could be removed in between and the
1424          * request wouldn't fail until another card was inserted.
1425          */
1426
1427         if (!dw_mci_get_cd(mmc)) {
1428                 mrq->cmd->error = -ENOMEDIUM;
1429                 mmc_request_done(mmc, mrq);
1430                 return;
1431         }
1432
1433         spin_lock_bh(&host->lock);
1434
1435         dw_mci_queue_request(host, slot, mrq);
1436
1437         spin_unlock_bh(&host->lock);
1438 }
1439
1440 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1441 {
1442         struct dw_mci_slot *slot = mmc_priv(mmc);
1443         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1444         u32 regs;
1445         int ret;
1446
1447         switch (ios->bus_width) {
1448         case MMC_BUS_WIDTH_4:
1449                 slot->ctype = SDMMC_CTYPE_4BIT;
1450                 break;
1451         case MMC_BUS_WIDTH_8:
1452                 slot->ctype = SDMMC_CTYPE_8BIT;
1453                 break;
1454         default:
1455                 /* set default 1 bit mode */
1456                 slot->ctype = SDMMC_CTYPE_1BIT;
1457         }
1458
1459         regs = mci_readl(slot->host, UHS_REG);
1460
1461         /* DDR mode set */
1462         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
1463             ios->timing == MMC_TIMING_UHS_DDR50 ||
1464             ios->timing == MMC_TIMING_MMC_HS400)
1465                 regs |= ((0x1 << slot->id) << 16);
1466         else
1467                 regs &= ~((0x1 << slot->id) << 16);
1468
1469         mci_writel(slot->host, UHS_REG, regs);
1470         slot->host->timing = ios->timing;
1471
1472         /*
1473          * Use mirror of ios->clock to prevent race with mmc
1474          * core ios update when finding the minimum.
1475          */
1476         slot->clock = ios->clock;
1477
1478         if (drv_data && drv_data->set_ios)
1479                 drv_data->set_ios(slot->host, ios);
1480
1481         switch (ios->power_mode) {
1482         case MMC_POWER_UP:
1483                 if (!IS_ERR(mmc->supply.vmmc)) {
1484                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1485                                         ios->vdd);
1486                         if (ret) {
1487                                 dev_err(slot->host->dev,
1488                                         "failed to enable vmmc regulator\n");
1489                                 /*return, if failed turn on vmmc*/
1490                                 return;
1491                         }
1492                 }
1493                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1494                 regs = mci_readl(slot->host, PWREN);
1495                 regs |= (1 << slot->id);
1496                 mci_writel(slot->host, PWREN, regs);
1497                 break;
1498         case MMC_POWER_ON:
1499                 if (!slot->host->vqmmc_enabled) {
1500                         if (!IS_ERR(mmc->supply.vqmmc)) {
1501                                 ret = regulator_enable(mmc->supply.vqmmc);
1502                                 if (ret < 0)
1503                                         dev_err(slot->host->dev,
1504                                                 "failed to enable vqmmc\n");
1505                                 else
1506                                         slot->host->vqmmc_enabled = true;
1507
1508                         } else {
1509                                 /* Keep track so we don't reset again */
1510                                 slot->host->vqmmc_enabled = true;
1511                         }
1512
1513                         /* Reset our state machine after powering on */
1514                         dw_mci_ctrl_reset(slot->host,
1515                                           SDMMC_CTRL_ALL_RESET_FLAGS);
1516                 }
1517
1518                 /* Adjust clock / bus width after power is up */
1519                 dw_mci_setup_bus(slot, false);
1520
1521                 break;
1522         case MMC_POWER_OFF:
1523                 /* Turn clock off before power goes down */
1524                 dw_mci_setup_bus(slot, false);
1525
1526                 if (!IS_ERR(mmc->supply.vmmc))
1527                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1528
1529                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled)
1530                         regulator_disable(mmc->supply.vqmmc);
1531                 slot->host->vqmmc_enabled = false;
1532
1533                 regs = mci_readl(slot->host, PWREN);
1534                 regs &= ~(1 << slot->id);
1535                 mci_writel(slot->host, PWREN, regs);
1536                 break;
1537         default:
1538                 break;
1539         }
1540
1541         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1542                 slot->host->state = STATE_IDLE;
1543 }
1544
1545 static int dw_mci_card_busy(struct mmc_host *mmc)
1546 {
1547         struct dw_mci_slot *slot = mmc_priv(mmc);
1548         u32 status;
1549
1550         /*
1551          * Check the busy bit which is low when DAT[3:0]
1552          * (the data lines) are 0000
1553          */
1554         status = mci_readl(slot->host, STATUS);
1555
1556         return !!(status & SDMMC_STATUS_BUSY);
1557 }
1558
1559 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1560 {
1561         struct dw_mci_slot *slot = mmc_priv(mmc);
1562         struct dw_mci *host = slot->host;
1563         const struct dw_mci_drv_data *drv_data = host->drv_data;
1564         u32 uhs;
1565         u32 v18 = SDMMC_UHS_18V << slot->id;
1566         int ret;
1567
1568         if (drv_data && drv_data->switch_voltage)
1569                 return drv_data->switch_voltage(mmc, ios);
1570
1571         /*
1572          * Program the voltage.  Note that some instances of dw_mmc may use
1573          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1574          * does no harm but you need to set the regulator directly.  Try both.
1575          */
1576         uhs = mci_readl(host, UHS_REG);
1577         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1578                 uhs &= ~v18;
1579         else
1580                 uhs |= v18;
1581
1582         if (!IS_ERR(mmc->supply.vqmmc)) {
1583                 ret = mmc_regulator_set_vqmmc(mmc, ios);
1584
1585                 if (ret) {
1586                         dev_dbg(&mmc->class_dev,
1587                                          "Regulator set error %d - %s V\n",
1588                                          ret, uhs & v18 ? "1.8" : "3.3");
1589                         return ret;
1590                 }
1591         }
1592         mci_writel(host, UHS_REG, uhs);
1593
1594         return 0;
1595 }
1596
1597 static int dw_mci_get_ro(struct mmc_host *mmc)
1598 {
1599         int read_only;
1600         struct dw_mci_slot *slot = mmc_priv(mmc);
1601         int gpio_ro = mmc_gpio_get_ro(mmc);
1602
1603         /* Use platform get_ro function, else try on board write protect */
1604         if (gpio_ro >= 0)
1605                 read_only = gpio_ro;
1606         else
1607                 read_only =
1608                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1609
1610         dev_dbg(&mmc->class_dev, "card is %s\n",
1611                 read_only ? "read-only" : "read-write");
1612
1613         return read_only;
1614 }
1615
1616 static void dw_mci_hw_reset(struct mmc_host *mmc)
1617 {
1618         struct dw_mci_slot *slot = mmc_priv(mmc);
1619         struct dw_mci *host = slot->host;
1620         int reset;
1621
1622         if (host->use_dma == TRANS_MODE_IDMAC)
1623                 dw_mci_idmac_reset(host);
1624
1625         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET |
1626                                      SDMMC_CTRL_FIFO_RESET))
1627                 return;
1628
1629         /*
1630          * According to eMMC spec, card reset procedure:
1631          * tRstW >= 1us:   RST_n pulse width
1632          * tRSCA >= 200us: RST_n to Command time
1633          * tRSTH >= 1us:   RST_n high period
1634          */
1635         reset = mci_readl(host, RST_N);
1636         reset &= ~(SDMMC_RST_HWACTIVE << slot->id);
1637         mci_writel(host, RST_N, reset);
1638         usleep_range(1, 2);
1639         reset |= SDMMC_RST_HWACTIVE << slot->id;
1640         mci_writel(host, RST_N, reset);
1641         usleep_range(200, 300);
1642 }
1643
1644 static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
1645 {
1646         struct dw_mci_slot *slot = mmc_priv(mmc);
1647         struct dw_mci *host = slot->host;
1648
1649         /*
1650          * Low power mode will stop the card clock when idle.  According to the
1651          * description of the CLKENA register we should disable low power mode
1652          * for SDIO cards if we need SDIO interrupts to work.
1653          */
1654         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1655                 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1656                 u32 clk_en_a_old;
1657                 u32 clk_en_a;
1658
1659                 clk_en_a_old = mci_readl(host, CLKENA);
1660
1661                 if (card->type == MMC_TYPE_SDIO ||
1662                     card->type == MMC_TYPE_SD_COMBO) {
1663                         set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1664                         clk_en_a = clk_en_a_old & ~clken_low_pwr;
1665                 } else {
1666                         clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1667                         clk_en_a = clk_en_a_old | clken_low_pwr;
1668                 }
1669
1670                 if (clk_en_a != clk_en_a_old) {
1671                         mci_writel(host, CLKENA, clk_en_a);
1672                         mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1673                                      SDMMC_CMD_PRV_DAT_WAIT, 0);
1674                 }
1675         }
1676 }
1677
1678 static void __dw_mci_enable_sdio_irq(struct dw_mci_slot *slot, int enb)
1679 {
1680         struct dw_mci *host = slot->host;
1681         unsigned long irqflags;
1682         u32 int_mask;
1683
1684         spin_lock_irqsave(&host->irq_lock, irqflags);
1685
1686         /* Enable/disable Slot Specific SDIO interrupt */
1687         int_mask = mci_readl(host, INTMASK);
1688         if (enb)
1689                 int_mask |= SDMMC_INT_SDIO(slot->sdio_id);
1690         else
1691                 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
1692         mci_writel(host, INTMASK, int_mask);
1693
1694         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1695 }
1696
1697 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1698 {
1699         struct dw_mci_slot *slot = mmc_priv(mmc);
1700         struct dw_mci *host = slot->host;
1701
1702         __dw_mci_enable_sdio_irq(slot, enb);
1703
1704         /* Avoid runtime suspending the device when SDIO IRQ is enabled */
1705         if (enb)
1706                 pm_runtime_get_noresume(host->dev);
1707         else
1708                 pm_runtime_put_noidle(host->dev);
1709 }
1710
1711 static void dw_mci_ack_sdio_irq(struct mmc_host *mmc)
1712 {
1713         struct dw_mci_slot *slot = mmc_priv(mmc);
1714
1715         __dw_mci_enable_sdio_irq(slot, 1);
1716 }
1717
1718 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1719 {
1720         struct dw_mci_slot *slot = mmc_priv(mmc);
1721         struct dw_mci *host = slot->host;
1722         const struct dw_mci_drv_data *drv_data = host->drv_data;
1723         int err = -EINVAL;
1724
1725         if (drv_data && drv_data->execute_tuning)
1726                 err = drv_data->execute_tuning(slot, opcode);
1727         return err;
1728 }
1729
1730 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc,
1731                                        struct mmc_ios *ios)
1732 {
1733         struct dw_mci_slot *slot = mmc_priv(mmc);
1734         struct dw_mci *host = slot->host;
1735         const struct dw_mci_drv_data *drv_data = host->drv_data;
1736
1737         if (drv_data && drv_data->prepare_hs400_tuning)
1738                 return drv_data->prepare_hs400_tuning(host, ios);
1739
1740         return 0;
1741 }
1742
1743 static bool dw_mci_reset(struct dw_mci *host)
1744 {
1745         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
1746         bool ret = false;
1747         u32 status = 0;
1748
1749         /*
1750          * Resetting generates a block interrupt, hence setting
1751          * the scatter-gather pointer to NULL.
1752          */
1753         if (host->sg) {
1754                 sg_miter_stop(&host->sg_miter);
1755                 host->sg = NULL;
1756         }
1757
1758         if (host->use_dma)
1759                 flags |= SDMMC_CTRL_DMA_RESET;
1760
1761         if (dw_mci_ctrl_reset(host, flags)) {
1762                 /*
1763                  * In all cases we clear the RAWINTS
1764                  * register to clear any interrupts.
1765                  */
1766                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1767
1768                 if (!host->use_dma) {
1769                         ret = true;
1770                         goto ciu_out;
1771                 }
1772
1773                 /* Wait for dma_req to be cleared */
1774                 if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS,
1775                                               status,
1776                                               !(status & SDMMC_STATUS_DMA_REQ),
1777                                               1, 500 * USEC_PER_MSEC)) {
1778                         dev_err(host->dev,
1779                                 "%s: Timeout waiting for dma_req to be cleared\n",
1780                                 __func__);
1781                         goto ciu_out;
1782                 }
1783
1784                 /* when using DMA next we reset the fifo again */
1785                 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
1786                         goto ciu_out;
1787         } else {
1788                 /* if the controller reset bit did clear, then set clock regs */
1789                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
1790                         dev_err(host->dev,
1791                                 "%s: fifo/dma reset bits didn't clear but ciu was reset, doing clock update\n",
1792                                 __func__);
1793                         goto ciu_out;
1794                 }
1795         }
1796
1797         if (host->use_dma == TRANS_MODE_IDMAC)
1798                 /* It is also recommended that we reset and reprogram idmac */
1799                 dw_mci_idmac_reset(host);
1800
1801         ret = true;
1802
1803 ciu_out:
1804         /* After a CTRL reset we need to have CIU set clock registers  */
1805         mci_send_cmd(host->slot, SDMMC_CMD_UPD_CLK, 0);
1806
1807         return ret;
1808 }
1809
1810 static const struct mmc_host_ops dw_mci_ops = {
1811         .request                = dw_mci_request,
1812         .pre_req                = dw_mci_pre_req,
1813         .post_req               = dw_mci_post_req,
1814         .set_ios                = dw_mci_set_ios,
1815         .get_ro                 = dw_mci_get_ro,
1816         .get_cd                 = dw_mci_get_cd,
1817         .hw_reset               = dw_mci_hw_reset,
1818         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1819         .ack_sdio_irq           = dw_mci_ack_sdio_irq,
1820         .execute_tuning         = dw_mci_execute_tuning,
1821         .card_busy              = dw_mci_card_busy,
1822         .start_signal_voltage_switch = dw_mci_switch_voltage,
1823         .init_card              = dw_mci_init_card,
1824         .prepare_hs400_tuning   = dw_mci_prepare_hs400_tuning,
1825 };
1826
1827 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1828         __releases(&host->lock)
1829         __acquires(&host->lock)
1830 {
1831         struct dw_mci_slot *slot;
1832         struct mmc_host *prev_mmc = host->slot->mmc;
1833
1834         WARN_ON(host->cmd || host->data);
1835
1836         host->slot->mrq = NULL;
1837         host->mrq = NULL;
1838         if (!list_empty(&host->queue)) {
1839                 slot = list_entry(host->queue.next,
1840                                   struct dw_mci_slot, queue_node);
1841                 list_del(&slot->queue_node);
1842                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1843                          mmc_hostname(slot->mmc));
1844                 host->state = STATE_SENDING_CMD;
1845                 dw_mci_start_request(host, slot);
1846         } else {
1847                 dev_vdbg(host->dev, "list empty\n");
1848
1849                 if (host->state == STATE_SENDING_CMD11)
1850                         host->state = STATE_WAITING_CMD11_DONE;
1851                 else
1852                         host->state = STATE_IDLE;
1853         }
1854
1855         spin_unlock(&host->lock);
1856         mmc_request_done(prev_mmc, mrq);
1857         spin_lock(&host->lock);
1858 }
1859
1860 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1861 {
1862         u32 status = host->cmd_status;
1863
1864         host->cmd_status = 0;
1865
1866         /* Read the response from the card (up to 16 bytes) */
1867         if (cmd->flags & MMC_RSP_PRESENT) {
1868                 if (cmd->flags & MMC_RSP_136) {
1869                         cmd->resp[3] = mci_readl(host, RESP0);
1870                         cmd->resp[2] = mci_readl(host, RESP1);
1871                         cmd->resp[1] = mci_readl(host, RESP2);
1872                         cmd->resp[0] = mci_readl(host, RESP3);
1873                 } else {
1874                         cmd->resp[0] = mci_readl(host, RESP0);
1875                         cmd->resp[1] = 0;
1876                         cmd->resp[2] = 0;
1877                         cmd->resp[3] = 0;
1878                 }
1879         }
1880
1881         if (status & SDMMC_INT_RTO)
1882                 cmd->error = -ETIMEDOUT;
1883         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1884                 cmd->error = -EILSEQ;
1885         else if (status & SDMMC_INT_RESP_ERR)
1886                 cmd->error = -EIO;
1887         else
1888                 cmd->error = 0;
1889
1890         return cmd->error;
1891 }
1892
1893 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1894 {
1895         u32 status = host->data_status;
1896
1897         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1898                 if (status & SDMMC_INT_DRTO) {
1899                         data->error = -ETIMEDOUT;
1900                 } else if (status & SDMMC_INT_DCRC) {
1901                         data->error = -EILSEQ;
1902                 } else if (status & SDMMC_INT_EBE) {
1903                         if (host->dir_status ==
1904                                 DW_MCI_SEND_STATUS) {
1905                                 /*
1906                                  * No data CRC status was returned.
1907                                  * The number of bytes transferred
1908                                  * will be exaggerated in PIO mode.
1909                                  */
1910                                 data->bytes_xfered = 0;
1911                                 data->error = -ETIMEDOUT;
1912                         } else if (host->dir_status ==
1913                                         DW_MCI_RECV_STATUS) {
1914                                 data->error = -EILSEQ;
1915                         }
1916                 } else {
1917                         /* SDMMC_INT_SBE is included */
1918                         data->error = -EILSEQ;
1919                 }
1920
1921                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1922
1923                 /*
1924                  * After an error, there may be data lingering
1925                  * in the FIFO
1926                  */
1927                 dw_mci_reset(host);
1928         } else {
1929                 data->bytes_xfered = data->blocks * data->blksz;
1930                 data->error = 0;
1931         }
1932
1933         return data->error;
1934 }
1935
1936 static void dw_mci_set_drto(struct dw_mci *host)
1937 {
1938         unsigned int drto_clks;
1939         unsigned int drto_div;
1940         unsigned int drto_ms;
1941         unsigned long irqflags;
1942
1943         drto_clks = mci_readl(host, TMOUT) >> 8;
1944         drto_div = (mci_readl(host, CLKDIV) & 0xff) * 2;
1945         if (drto_div == 0)
1946                 drto_div = 1;
1947         drto_ms = DIV_ROUND_UP(MSEC_PER_SEC * drto_clks * drto_div,
1948                                host->bus_hz);
1949
1950         /* add a bit spare time */
1951         drto_ms += 10;
1952
1953         spin_lock_irqsave(&host->irq_lock, irqflags);
1954         if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events))
1955                 mod_timer(&host->dto_timer,
1956                           jiffies + msecs_to_jiffies(drto_ms));
1957         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1958 }
1959
1960 static bool dw_mci_clear_pending_cmd_complete(struct dw_mci *host)
1961 {
1962         if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1963                 return false;
1964
1965         /*
1966          * Really be certain that the timer has stopped.  This is a bit of
1967          * paranoia and could only really happen if we had really bad
1968          * interrupt latency and the interrupt routine and timeout were
1969          * running concurrently so that the del_timer() in the interrupt
1970          * handler couldn't run.
1971          */
1972         WARN_ON(del_timer_sync(&host->cto_timer));
1973         clear_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1974
1975         return true;
1976 }
1977
1978 static bool dw_mci_clear_pending_data_complete(struct dw_mci *host)
1979 {
1980         if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events))
1981                 return false;
1982
1983         /* Extra paranoia just like dw_mci_clear_pending_cmd_complete() */
1984         WARN_ON(del_timer_sync(&host->dto_timer));
1985         clear_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1986
1987         return true;
1988 }
1989
1990 static void dw_mci_tasklet_func(unsigned long priv)
1991 {
1992         struct dw_mci *host = (struct dw_mci *)priv;
1993         struct mmc_data *data;
1994         struct mmc_command *cmd;
1995         struct mmc_request *mrq;
1996         enum dw_mci_state state;
1997         enum dw_mci_state prev_state;
1998         unsigned int err;
1999
2000         spin_lock(&host->lock);
2001
2002         state = host->state;
2003         data = host->data;
2004         mrq = host->mrq;
2005
2006         do {
2007                 prev_state = state;
2008
2009                 switch (state) {
2010                 case STATE_IDLE:
2011                 case STATE_WAITING_CMD11_DONE:
2012                         break;
2013
2014                 case STATE_SENDING_CMD11:
2015                 case STATE_SENDING_CMD:
2016                         if (!dw_mci_clear_pending_cmd_complete(host))
2017                                 break;
2018
2019                         cmd = host->cmd;
2020                         host->cmd = NULL;
2021                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
2022                         err = dw_mci_command_complete(host, cmd);
2023                         if (cmd == mrq->sbc && !err) {
2024                                 prev_state = state = STATE_SENDING_CMD;
2025                                 __dw_mci_start_request(host, host->slot,
2026                                                        mrq->cmd);
2027                                 goto unlock;
2028                         }
2029
2030                         if (cmd->data && err) {
2031                                 /*
2032                                  * During UHS tuning sequence, sending the stop
2033                                  * command after the response CRC error would
2034                                  * throw the system into a confused state
2035                                  * causing all future tuning phases to report
2036                                  * failure.
2037                                  *
2038                                  * In such case controller will move into a data
2039                                  * transfer state after a response error or
2040                                  * response CRC error. Let's let that finish
2041                                  * before trying to send a stop, so we'll go to
2042                                  * STATE_SENDING_DATA.
2043                                  *
2044                                  * Although letting the data transfer take place
2045                                  * will waste a bit of time (we already know
2046                                  * the command was bad), it can't cause any
2047                                  * errors since it's possible it would have
2048                                  * taken place anyway if this tasklet got
2049                                  * delayed. Allowing the transfer to take place
2050                                  * avoids races and keeps things simple.
2051                                  */
2052                                 if ((err != -ETIMEDOUT) &&
2053                                     (cmd->opcode == MMC_SEND_TUNING_BLOCK)) {
2054                                         state = STATE_SENDING_DATA;
2055                                         continue;
2056                                 }
2057
2058                                 dw_mci_stop_dma(host);
2059                                 send_stop_abort(host, data);
2060                                 state = STATE_SENDING_STOP;
2061                                 break;
2062                         }
2063
2064                         if (!cmd->data || err) {
2065                                 dw_mci_request_end(host, mrq);
2066                                 goto unlock;
2067                         }
2068
2069                         prev_state = state = STATE_SENDING_DATA;
2070                         /* fall through */
2071
2072                 case STATE_SENDING_DATA:
2073                         /*
2074                          * We could get a data error and never a transfer
2075                          * complete so we'd better check for it here.
2076                          *
2077                          * Note that we don't really care if we also got a
2078                          * transfer complete; stopping the DMA and sending an
2079                          * abort won't hurt.
2080                          */
2081                         if (test_and_clear_bit(EVENT_DATA_ERROR,
2082                                                &host->pending_events)) {
2083                                 dw_mci_stop_dma(host);
2084                                 if (!(host->data_status & (SDMMC_INT_DRTO |
2085                                                            SDMMC_INT_EBE)))
2086                                         send_stop_abort(host, data);
2087                                 state = STATE_DATA_ERROR;
2088                                 break;
2089                         }
2090
2091                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
2092                                                 &host->pending_events)) {
2093                                 /*
2094                                  * If all data-related interrupts don't come
2095                                  * within the given time in reading data state.
2096                                  */
2097                                 if (host->dir_status == DW_MCI_RECV_STATUS)
2098                                         dw_mci_set_drto(host);
2099                                 break;
2100                         }
2101
2102                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
2103
2104                         /*
2105                          * Handle an EVENT_DATA_ERROR that might have shown up
2106                          * before the transfer completed.  This might not have
2107                          * been caught by the check above because the interrupt
2108                          * could have gone off between the previous check and
2109                          * the check for transfer complete.
2110                          *
2111                          * Technically this ought not be needed assuming we
2112                          * get a DATA_COMPLETE eventually (we'll notice the
2113                          * error and end the request), but it shouldn't hurt.
2114                          *
2115                          * This has the advantage of sending the stop command.
2116                          */
2117                         if (test_and_clear_bit(EVENT_DATA_ERROR,
2118                                                &host->pending_events)) {
2119                                 dw_mci_stop_dma(host);
2120                                 if (!(host->data_status & (SDMMC_INT_DRTO |
2121                                                            SDMMC_INT_EBE)))
2122                                         send_stop_abort(host, data);
2123                                 state = STATE_DATA_ERROR;
2124                                 break;
2125                         }
2126                         prev_state = state = STATE_DATA_BUSY;
2127
2128                         /* fall through */
2129
2130                 case STATE_DATA_BUSY:
2131                         if (!dw_mci_clear_pending_data_complete(host)) {
2132                                 /*
2133                                  * If data error interrupt comes but data over
2134                                  * interrupt doesn't come within the given time.
2135                                  * in reading data state.
2136                                  */
2137                                 if (host->dir_status == DW_MCI_RECV_STATUS)
2138                                         dw_mci_set_drto(host);
2139                                 break;
2140                         }
2141
2142                         host->data = NULL;
2143                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
2144                         err = dw_mci_data_complete(host, data);
2145
2146                         if (!err) {
2147                                 if (!data->stop || mrq->sbc) {
2148                                         if (mrq->sbc && data->stop)
2149                                                 data->stop->error = 0;
2150                                         dw_mci_request_end(host, mrq);
2151                                         goto unlock;
2152                                 }
2153
2154                                 /* stop command for open-ended transfer*/
2155                                 if (data->stop)
2156                                         send_stop_abort(host, data);
2157                         } else {
2158                                 /*
2159                                  * If we don't have a command complete now we'll
2160                                  * never get one since we just reset everything;
2161                                  * better end the request.
2162                                  *
2163                                  * If we do have a command complete we'll fall
2164                                  * through to the SENDING_STOP command and
2165                                  * everything will be peachy keen.
2166                                  */
2167                                 if (!test_bit(EVENT_CMD_COMPLETE,
2168                                               &host->pending_events)) {
2169                                         host->cmd = NULL;
2170                                         dw_mci_request_end(host, mrq);
2171                                         goto unlock;
2172                                 }
2173                         }
2174
2175                         /*
2176                          * If err has non-zero,
2177                          * stop-abort command has been already issued.
2178                          */
2179                         prev_state = state = STATE_SENDING_STOP;
2180
2181                         /* fall through */
2182
2183                 case STATE_SENDING_STOP:
2184                         if (!dw_mci_clear_pending_cmd_complete(host))
2185                                 break;
2186
2187                         /* CMD error in data command */
2188                         if (mrq->cmd->error && mrq->data)
2189                                 dw_mci_reset(host);
2190
2191                         host->cmd = NULL;
2192                         host->data = NULL;
2193
2194                         if (!mrq->sbc && mrq->stop)
2195                                 dw_mci_command_complete(host, mrq->stop);
2196                         else
2197                                 host->cmd_status = 0;
2198
2199                         dw_mci_request_end(host, mrq);
2200                         goto unlock;
2201
2202                 case STATE_DATA_ERROR:
2203                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
2204                                                 &host->pending_events))
2205                                 break;
2206
2207                         state = STATE_DATA_BUSY;
2208                         break;
2209                 }
2210         } while (state != prev_state);
2211
2212         host->state = state;
2213 unlock:
2214         spin_unlock(&host->lock);
2215
2216 }
2217
2218 /* push final bytes to part_buf, only use during push */
2219 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
2220 {
2221         memcpy((void *)&host->part_buf, buf, cnt);
2222         host->part_buf_count = cnt;
2223 }
2224
2225 /* append bytes to part_buf, only use during push */
2226 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
2227 {
2228         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
2229         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
2230         host->part_buf_count += cnt;
2231         return cnt;
2232 }
2233
2234 /* pull first bytes from part_buf, only use during pull */
2235 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
2236 {
2237         cnt = min_t(int, cnt, host->part_buf_count);
2238         if (cnt) {
2239                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
2240                        cnt);
2241                 host->part_buf_count -= cnt;
2242                 host->part_buf_start += cnt;
2243         }
2244         return cnt;
2245 }
2246
2247 /* pull final bytes from the part_buf, assuming it's just been filled */
2248 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
2249 {
2250         memcpy(buf, &host->part_buf, cnt);
2251         host->part_buf_start = cnt;
2252         host->part_buf_count = (1 << host->data_shift) - cnt;
2253 }
2254
2255 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
2256 {
2257         struct mmc_data *data = host->data;
2258         int init_cnt = cnt;
2259
2260         /* try and push anything in the part_buf */
2261         if (unlikely(host->part_buf_count)) {
2262                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2263
2264                 buf += len;
2265                 cnt -= len;
2266                 if (host->part_buf_count == 2) {
2267                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2268                         host->part_buf_count = 0;
2269                 }
2270         }
2271 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2272         if (unlikely((unsigned long)buf & 0x1)) {
2273                 while (cnt >= 2) {
2274                         u16 aligned_buf[64];
2275                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2276                         int items = len >> 1;
2277                         int i;
2278                         /* memcpy from input buffer into aligned buffer */
2279                         memcpy(aligned_buf, buf, len);
2280                         buf += len;
2281                         cnt -= len;
2282                         /* push data from aligned buffer into fifo */
2283                         for (i = 0; i < items; ++i)
2284                                 mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
2285                 }
2286         } else
2287 #endif
2288         {
2289                 u16 *pdata = buf;
2290
2291                 for (; cnt >= 2; cnt -= 2)
2292                         mci_fifo_writew(host->fifo_reg, *pdata++);
2293                 buf = pdata;
2294         }
2295         /* put anything remaining in the part_buf */
2296         if (cnt) {
2297                 dw_mci_set_part_bytes(host, buf, cnt);
2298                  /* Push data if we have reached the expected data length */
2299                 if ((data->bytes_xfered + init_cnt) ==
2300                     (data->blksz * data->blocks))
2301                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2302         }
2303 }
2304
2305 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
2306 {
2307 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2308         if (unlikely((unsigned long)buf & 0x1)) {
2309                 while (cnt >= 2) {
2310                         /* pull data from fifo into aligned buffer */
2311                         u16 aligned_buf[64];
2312                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2313                         int items = len >> 1;
2314                         int i;
2315
2316                         for (i = 0; i < items; ++i)
2317                                 aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
2318                         /* memcpy from aligned buffer into output buffer */
2319                         memcpy(buf, aligned_buf, len);
2320                         buf += len;
2321                         cnt -= len;
2322                 }
2323         } else
2324 #endif
2325         {
2326                 u16 *pdata = buf;
2327
2328                 for (; cnt >= 2; cnt -= 2)
2329                         *pdata++ = mci_fifo_readw(host->fifo_reg);
2330                 buf = pdata;
2331         }
2332         if (cnt) {
2333                 host->part_buf16 = mci_fifo_readw(host->fifo_reg);
2334                 dw_mci_pull_final_bytes(host, buf, cnt);
2335         }
2336 }
2337
2338 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
2339 {
2340         struct mmc_data *data = host->data;
2341         int init_cnt = cnt;
2342
2343         /* try and push anything in the part_buf */
2344         if (unlikely(host->part_buf_count)) {
2345                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2346
2347                 buf += len;
2348                 cnt -= len;
2349                 if (host->part_buf_count == 4) {
2350                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2351                         host->part_buf_count = 0;
2352                 }
2353         }
2354 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2355         if (unlikely((unsigned long)buf & 0x3)) {
2356                 while (cnt >= 4) {
2357                         u32 aligned_buf[32];
2358                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2359                         int items = len >> 2;
2360                         int i;
2361                         /* memcpy from input buffer into aligned buffer */
2362                         memcpy(aligned_buf, buf, len);
2363                         buf += len;
2364                         cnt -= len;
2365                         /* push data from aligned buffer into fifo */
2366                         for (i = 0; i < items; ++i)
2367                                 mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
2368                 }
2369         } else
2370 #endif
2371         {
2372                 u32 *pdata = buf;
2373
2374                 for (; cnt >= 4; cnt -= 4)
2375                         mci_fifo_writel(host->fifo_reg, *pdata++);
2376                 buf = pdata;
2377         }
2378         /* put anything remaining in the part_buf */
2379         if (cnt) {
2380                 dw_mci_set_part_bytes(host, buf, cnt);
2381                  /* Push data if we have reached the expected data length */
2382                 if ((data->bytes_xfered + init_cnt) ==
2383                     (data->blksz * data->blocks))
2384                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2385         }
2386 }
2387
2388 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
2389 {
2390 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2391         if (unlikely((unsigned long)buf & 0x3)) {
2392                 while (cnt >= 4) {
2393                         /* pull data from fifo into aligned buffer */
2394                         u32 aligned_buf[32];
2395                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2396                         int items = len >> 2;
2397                         int i;
2398
2399                         for (i = 0; i < items; ++i)
2400                                 aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
2401                         /* memcpy from aligned buffer into output buffer */
2402                         memcpy(buf, aligned_buf, len);
2403                         buf += len;
2404                         cnt -= len;
2405                 }
2406         } else
2407 #endif
2408         {
2409                 u32 *pdata = buf;
2410
2411                 for (; cnt >= 4; cnt -= 4)
2412                         *pdata++ = mci_fifo_readl(host->fifo_reg);
2413                 buf = pdata;
2414         }
2415         if (cnt) {
2416                 host->part_buf32 = mci_fifo_readl(host->fifo_reg);
2417                 dw_mci_pull_final_bytes(host, buf, cnt);
2418         }
2419 }
2420
2421 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
2422 {
2423         struct mmc_data *data = host->data;
2424         int init_cnt = cnt;
2425
2426         /* try and push anything in the part_buf */
2427         if (unlikely(host->part_buf_count)) {
2428                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2429
2430                 buf += len;
2431                 cnt -= len;
2432
2433                 if (host->part_buf_count == 8) {
2434                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2435                         host->part_buf_count = 0;
2436                 }
2437         }
2438 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2439         if (unlikely((unsigned long)buf & 0x7)) {
2440                 while (cnt >= 8) {
2441                         u64 aligned_buf[16];
2442                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2443                         int items = len >> 3;
2444                         int i;
2445                         /* memcpy from input buffer into aligned buffer */
2446                         memcpy(aligned_buf, buf, len);
2447                         buf += len;
2448                         cnt -= len;
2449                         /* push data from aligned buffer into fifo */
2450                         for (i = 0; i < items; ++i)
2451                                 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
2452                 }
2453         } else
2454 #endif
2455         {
2456                 u64 *pdata = buf;
2457
2458                 for (; cnt >= 8; cnt -= 8)
2459                         mci_fifo_writeq(host->fifo_reg, *pdata++);
2460                 buf = pdata;
2461         }
2462         /* put anything remaining in the part_buf */
2463         if (cnt) {
2464                 dw_mci_set_part_bytes(host, buf, cnt);
2465                 /* Push data if we have reached the expected data length */
2466                 if ((data->bytes_xfered + init_cnt) ==
2467                     (data->blksz * data->blocks))
2468                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2469         }
2470 }
2471
2472 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
2473 {
2474 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2475         if (unlikely((unsigned long)buf & 0x7)) {
2476                 while (cnt >= 8) {
2477                         /* pull data from fifo into aligned buffer */
2478                         u64 aligned_buf[16];
2479                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2480                         int items = len >> 3;
2481                         int i;
2482
2483                         for (i = 0; i < items; ++i)
2484                                 aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
2485
2486                         /* memcpy from aligned buffer into output buffer */
2487                         memcpy(buf, aligned_buf, len);
2488                         buf += len;
2489                         cnt -= len;
2490                 }
2491         } else
2492 #endif
2493         {
2494                 u64 *pdata = buf;
2495
2496                 for (; cnt >= 8; cnt -= 8)
2497                         *pdata++ = mci_fifo_readq(host->fifo_reg);
2498                 buf = pdata;
2499         }
2500         if (cnt) {
2501                 host->part_buf = mci_fifo_readq(host->fifo_reg);
2502                 dw_mci_pull_final_bytes(host, buf, cnt);
2503         }
2504 }
2505
2506 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
2507 {
2508         int len;
2509
2510         /* get remaining partial bytes */
2511         len = dw_mci_pull_part_bytes(host, buf, cnt);
2512         if (unlikely(len == cnt))
2513                 return;
2514         buf += len;
2515         cnt -= len;
2516
2517         /* get the rest of the data */
2518         host->pull_data(host, buf, cnt);
2519 }
2520
2521 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
2522 {
2523         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2524         void *buf;
2525         unsigned int offset;
2526         struct mmc_data *data = host->data;
2527         int shift = host->data_shift;
2528         u32 status;
2529         unsigned int len;
2530         unsigned int remain, fcnt;
2531
2532         do {
2533                 if (!sg_miter_next(sg_miter))
2534                         goto done;
2535
2536                 host->sg = sg_miter->piter.sg;
2537                 buf = sg_miter->addr;
2538                 remain = sg_miter->length;
2539                 offset = 0;
2540
2541                 do {
2542                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
2543                                         << shift) + host->part_buf_count;
2544                         len = min(remain, fcnt);
2545                         if (!len)
2546                                 break;
2547                         dw_mci_pull_data(host, (void *)(buf + offset), len);
2548                         data->bytes_xfered += len;
2549                         offset += len;
2550                         remain -= len;
2551                 } while (remain);
2552
2553                 sg_miter->consumed = offset;
2554                 status = mci_readl(host, MINTSTS);
2555                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2556         /* if the RXDR is ready read again */
2557         } while ((status & SDMMC_INT_RXDR) ||
2558                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
2559
2560         if (!remain) {
2561                 if (!sg_miter_next(sg_miter))
2562                         goto done;
2563                 sg_miter->consumed = 0;
2564         }
2565         sg_miter_stop(sg_miter);
2566         return;
2567
2568 done:
2569         sg_miter_stop(sg_miter);
2570         host->sg = NULL;
2571         smp_wmb(); /* drain writebuffer */
2572         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2573 }
2574
2575 static void dw_mci_write_data_pio(struct dw_mci *host)
2576 {
2577         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2578         void *buf;
2579         unsigned int offset;
2580         struct mmc_data *data = host->data;
2581         int shift = host->data_shift;
2582         u32 status;
2583         unsigned int len;
2584         unsigned int fifo_depth = host->fifo_depth;
2585         unsigned int remain, fcnt;
2586
2587         do {
2588                 if (!sg_miter_next(sg_miter))
2589                         goto done;
2590
2591                 host->sg = sg_miter->piter.sg;
2592                 buf = sg_miter->addr;
2593                 remain = sg_miter->length;
2594                 offset = 0;
2595
2596                 do {
2597                         fcnt = ((fifo_depth -
2598                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2599                                         << shift) - host->part_buf_count;
2600                         len = min(remain, fcnt);
2601                         if (!len)
2602                                 break;
2603                         host->push_data(host, (void *)(buf + offset), len);
2604                         data->bytes_xfered += len;
2605                         offset += len;
2606                         remain -= len;
2607                 } while (remain);
2608
2609                 sg_miter->consumed = offset;
2610                 status = mci_readl(host, MINTSTS);
2611                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2612         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2613
2614         if (!remain) {
2615                 if (!sg_miter_next(sg_miter))
2616                         goto done;
2617                 sg_miter->consumed = 0;
2618         }
2619         sg_miter_stop(sg_miter);
2620         return;
2621
2622 done:
2623         sg_miter_stop(sg_miter);
2624         host->sg = NULL;
2625         smp_wmb(); /* drain writebuffer */
2626         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2627 }
2628
2629 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2630 {
2631         del_timer(&host->cto_timer);
2632
2633         if (!host->cmd_status)
2634                 host->cmd_status = status;
2635
2636         smp_wmb(); /* drain writebuffer */
2637
2638         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2639         tasklet_schedule(&host->tasklet);
2640 }
2641
2642 static void dw_mci_handle_cd(struct dw_mci *host)
2643 {
2644         struct dw_mci_slot *slot = host->slot;
2645
2646         if (slot->mmc->ops->card_event)
2647                 slot->mmc->ops->card_event(slot->mmc);
2648         mmc_detect_change(slot->mmc,
2649                 msecs_to_jiffies(host->pdata->detect_delay_ms));
2650 }
2651
2652 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2653 {
2654         struct dw_mci *host = dev_id;
2655         u32 pending;
2656         struct dw_mci_slot *slot = host->slot;
2657         unsigned long irqflags;
2658
2659         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2660
2661         if (pending) {
2662                 /* Check volt switch first, since it can look like an error */
2663                 if ((host->state == STATE_SENDING_CMD11) &&
2664                     (pending & SDMMC_INT_VOLT_SWITCH)) {
2665                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2666                         pending &= ~SDMMC_INT_VOLT_SWITCH;
2667
2668                         /*
2669                          * Hold the lock; we know cmd11_timer can't be kicked
2670                          * off after the lock is released, so safe to delete.
2671                          */
2672                         spin_lock_irqsave(&host->irq_lock, irqflags);
2673                         dw_mci_cmd_interrupt(host, pending);
2674                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2675
2676                         del_timer(&host->cmd11_timer);
2677                 }
2678
2679                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2680                         spin_lock_irqsave(&host->irq_lock, irqflags);
2681
2682                         del_timer(&host->cto_timer);
2683                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2684                         host->cmd_status = pending;
2685                         smp_wmb(); /* drain writebuffer */
2686                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2687
2688                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2689                 }
2690
2691                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2692                         /* if there is an error report DATA_ERROR */
2693                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2694                         host->data_status = pending;
2695                         smp_wmb(); /* drain writebuffer */
2696                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
2697                         tasklet_schedule(&host->tasklet);
2698                 }
2699
2700                 if (pending & SDMMC_INT_DATA_OVER) {
2701                         spin_lock_irqsave(&host->irq_lock, irqflags);
2702
2703                         del_timer(&host->dto_timer);
2704
2705                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2706                         if (!host->data_status)
2707                                 host->data_status = pending;
2708                         smp_wmb(); /* drain writebuffer */
2709                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2710                                 if (host->sg != NULL)
2711                                         dw_mci_read_data_pio(host, true);
2712                         }
2713                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2714                         tasklet_schedule(&host->tasklet);
2715
2716                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2717                 }
2718
2719                 if (pending & SDMMC_INT_RXDR) {
2720                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2721                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2722                                 dw_mci_read_data_pio(host, false);
2723                 }
2724
2725                 if (pending & SDMMC_INT_TXDR) {
2726                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2727                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2728                                 dw_mci_write_data_pio(host);
2729                 }
2730
2731                 if (pending & SDMMC_INT_CMD_DONE) {
2732                         spin_lock_irqsave(&host->irq_lock, irqflags);
2733
2734                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2735                         dw_mci_cmd_interrupt(host, pending);
2736
2737                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2738                 }
2739
2740                 if (pending & SDMMC_INT_CD) {
2741                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2742                         dw_mci_handle_cd(host);
2743                 }
2744
2745                 if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2746                         mci_writel(host, RINTSTS,
2747                                    SDMMC_INT_SDIO(slot->sdio_id));
2748                         __dw_mci_enable_sdio_irq(slot, 0);
2749                         sdio_signal_irq(slot->mmc);
2750                 }
2751
2752         }
2753
2754         if (host->use_dma != TRANS_MODE_IDMAC)
2755                 return IRQ_HANDLED;
2756
2757         /* Handle IDMA interrupts */
2758         if (host->dma_64bit_address == 1) {
2759                 pending = mci_readl(host, IDSTS64);
2760                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2761                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2762                                                         SDMMC_IDMAC_INT_RI);
2763                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2764                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2765                                 host->dma_ops->complete((void *)host);
2766                 }
2767         } else {
2768                 pending = mci_readl(host, IDSTS);
2769                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2770                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2771                                                         SDMMC_IDMAC_INT_RI);
2772                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2773                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2774                                 host->dma_ops->complete((void *)host);
2775                 }
2776         }
2777
2778         return IRQ_HANDLED;
2779 }
2780
2781 static int dw_mci_init_slot(struct dw_mci *host)
2782 {
2783         struct mmc_host *mmc;
2784         struct dw_mci_slot *slot;
2785         const struct dw_mci_drv_data *drv_data = host->drv_data;
2786         int ctrl_id, ret;
2787         u32 freq[2];
2788
2789         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2790         if (!mmc)
2791                 return -ENOMEM;
2792
2793         slot = mmc_priv(mmc);
2794         slot->id = 0;
2795         slot->sdio_id = host->sdio_id0 + slot->id;
2796         slot->mmc = mmc;
2797         slot->host = host;
2798         host->slot = slot;
2799
2800         mmc->ops = &dw_mci_ops;
2801         if (device_property_read_u32_array(host->dev, "clock-freq-min-max",
2802                                            freq, 2)) {
2803                 mmc->f_min = DW_MCI_FREQ_MIN;
2804                 mmc->f_max = DW_MCI_FREQ_MAX;
2805         } else {
2806                 dev_info(host->dev,
2807                         "'clock-freq-min-max' property was deprecated.\n");
2808                 mmc->f_min = freq[0];
2809                 mmc->f_max = freq[1];
2810         }
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         if (host->pdata->caps)
2821                 mmc->caps = host->pdata->caps;
2822
2823         /*
2824          * Support MMC_CAP_ERASE by default.
2825          * It needs to use trim/discard/erase commands.
2826          */
2827         mmc->caps |= MMC_CAP_ERASE;
2828
2829         if (host->pdata->pm_caps)
2830                 mmc->pm_caps = host->pdata->pm_caps;
2831
2832         if (host->dev->of_node) {
2833                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2834                 if (ctrl_id < 0)
2835                         ctrl_id = 0;
2836         } else {
2837                 ctrl_id = to_platform_device(host->dev)->id;
2838         }
2839         if (drv_data && drv_data->caps)
2840                 mmc->caps |= drv_data->caps[ctrl_id];
2841
2842         if (host->pdata->caps2)
2843                 mmc->caps2 = host->pdata->caps2;
2844
2845         ret = mmc_of_parse(mmc);
2846         if (ret)
2847                 goto err_host_allocated;
2848
2849         /* Process SDIO IRQs through the sdio_irq_work. */
2850         if (mmc->caps & MMC_CAP_SDIO_IRQ)
2851                 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
2852
2853         /* Useful defaults if platform data is unset. */
2854         if (host->use_dma == TRANS_MODE_IDMAC) {
2855                 mmc->max_segs = host->ring_size;
2856                 mmc->max_blk_size = 65535;
2857                 mmc->max_seg_size = 0x1000;
2858                 mmc->max_req_size = mmc->max_seg_size * host->ring_size;
2859                 mmc->max_blk_count = mmc->max_req_size / 512;
2860         } else if (host->use_dma == TRANS_MODE_EDMAC) {
2861                 mmc->max_segs = 64;
2862                 mmc->max_blk_size = 65535;
2863                 mmc->max_blk_count = 65535;
2864                 mmc->max_req_size =
2865                                 mmc->max_blk_size * mmc->max_blk_count;
2866                 mmc->max_seg_size = mmc->max_req_size;
2867         } else {
2868                 /* TRANS_MODE_PIO */
2869                 mmc->max_segs = 64;
2870                 mmc->max_blk_size = 65535; /* BLKSIZ is 16 bits */
2871                 mmc->max_blk_count = 512;
2872                 mmc->max_req_size = mmc->max_blk_size *
2873                                     mmc->max_blk_count;
2874                 mmc->max_seg_size = mmc->max_req_size;
2875         }
2876
2877         dw_mci_get_cd(mmc);
2878
2879         ret = mmc_add_host(mmc);
2880         if (ret)
2881                 goto err_host_allocated;
2882
2883 #if defined(CONFIG_DEBUG_FS)
2884         dw_mci_init_debugfs(slot);
2885 #endif
2886
2887         return 0;
2888
2889 err_host_allocated:
2890         mmc_free_host(mmc);
2891         return ret;
2892 }
2893
2894 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot)
2895 {
2896         /* Debugfs stuff is cleaned up by mmc core */
2897         mmc_remove_host(slot->mmc);
2898         slot->host->slot = NULL;
2899         mmc_free_host(slot->mmc);
2900 }
2901
2902 static void dw_mci_init_dma(struct dw_mci *host)
2903 {
2904         int addr_config;
2905         struct device *dev = host->dev;
2906
2907         /*
2908         * Check tansfer mode from HCON[17:16]
2909         * Clear the ambiguous description of dw_mmc databook:
2910         * 2b'00: No DMA Interface -> Actually means using Internal DMA block
2911         * 2b'01: DesignWare DMA Interface -> Synopsys DW-DMA block
2912         * 2b'10: Generic DMA Interface -> non-Synopsys generic DMA block
2913         * 2b'11: Non DW DMA Interface -> pio only
2914         * Compared to DesignWare DMA Interface, Generic DMA Interface has a
2915         * simpler request/acknowledge handshake mechanism and both of them
2916         * are regarded as external dma master for dw_mmc.
2917         */
2918         host->use_dma = SDMMC_GET_TRANS_MODE(mci_readl(host, HCON));
2919         if (host->use_dma == DMA_INTERFACE_IDMA) {
2920                 host->use_dma = TRANS_MODE_IDMAC;
2921         } else if (host->use_dma == DMA_INTERFACE_DWDMA ||
2922                    host->use_dma == DMA_INTERFACE_GDMA) {
2923                 host->use_dma = TRANS_MODE_EDMAC;
2924         } else {
2925                 goto no_dma;
2926         }
2927
2928         /* Determine which DMA interface to use */
2929         if (host->use_dma == TRANS_MODE_IDMAC) {
2930                 /*
2931                 * Check ADDR_CONFIG bit in HCON to find
2932                 * IDMAC address bus width
2933                 */
2934                 addr_config = SDMMC_GET_ADDR_CONFIG(mci_readl(host, HCON));
2935
2936                 if (addr_config == 1) {
2937                         /* host supports IDMAC in 64-bit address mode */
2938                         host->dma_64bit_address = 1;
2939                         dev_info(host->dev,
2940                                  "IDMAC supports 64-bit address mode.\n");
2941                         if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2942                                 dma_set_coherent_mask(host->dev,
2943                                                       DMA_BIT_MASK(64));
2944                 } else {
2945                         /* host supports IDMAC in 32-bit address mode */
2946                         host->dma_64bit_address = 0;
2947                         dev_info(host->dev,
2948                                  "IDMAC supports 32-bit address mode.\n");
2949                 }
2950
2951                 /* Alloc memory for sg translation */
2952                 host->sg_cpu = dmam_alloc_coherent(host->dev,
2953                                                    DESC_RING_BUF_SZ,
2954                                                    &host->sg_dma, GFP_KERNEL);
2955                 if (!host->sg_cpu) {
2956                         dev_err(host->dev,
2957                                 "%s: could not alloc DMA memory\n",
2958                                 __func__);
2959                         goto no_dma;
2960                 }
2961
2962                 host->dma_ops = &dw_mci_idmac_ops;
2963                 dev_info(host->dev, "Using internal DMA controller.\n");
2964         } else {
2965                 /* TRANS_MODE_EDMAC: check dma bindings again */
2966                 if ((device_property_read_string_array(dev, "dma-names",
2967                                                        NULL, 0) < 0) ||
2968                     !device_property_present(dev, "dmas")) {
2969                         goto no_dma;
2970                 }
2971                 host->dma_ops = &dw_mci_edmac_ops;
2972                 dev_info(host->dev, "Using external DMA controller.\n");
2973         }
2974
2975         if (host->dma_ops->init && host->dma_ops->start &&
2976             host->dma_ops->stop && host->dma_ops->cleanup) {
2977                 if (host->dma_ops->init(host)) {
2978                         dev_err(host->dev, "%s: Unable to initialize DMA Controller.\n",
2979                                 __func__);
2980                         goto no_dma;
2981                 }
2982         } else {
2983                 dev_err(host->dev, "DMA initialization not found.\n");
2984                 goto no_dma;
2985         }
2986
2987         return;
2988
2989 no_dma:
2990         dev_info(host->dev, "Using PIO mode.\n");
2991         host->use_dma = TRANS_MODE_PIO;
2992 }
2993
2994 static void dw_mci_cmd11_timer(struct timer_list *t)
2995 {
2996         struct dw_mci *host = from_timer(host, t, cmd11_timer);
2997
2998         if (host->state != STATE_SENDING_CMD11) {
2999                 dev_warn(host->dev, "Unexpected CMD11 timeout\n");
3000                 return;
3001         }
3002
3003         host->cmd_status = SDMMC_INT_RTO;
3004         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
3005         tasklet_schedule(&host->tasklet);
3006 }
3007
3008 static void dw_mci_cto_timer(struct timer_list *t)
3009 {
3010         struct dw_mci *host = from_timer(host, t, cto_timer);
3011         unsigned long irqflags;
3012         u32 pending;
3013
3014         spin_lock_irqsave(&host->irq_lock, irqflags);
3015
3016         /*
3017          * If somehow we have very bad interrupt latency it's remotely possible
3018          * that the timer could fire while the interrupt is still pending or
3019          * while the interrupt is midway through running.  Let's be paranoid
3020          * and detect those two cases.  Note that this is paranoia is somewhat
3021          * justified because in this function we don't actually cancel the
3022          * pending command in the controller--we just assume it will never come.
3023          */
3024         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
3025         if (pending & (DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_CMD_DONE)) {
3026                 /* The interrupt should fire; no need to act but we can warn */
3027                 dev_warn(host->dev, "Unexpected interrupt latency\n");
3028                 goto exit;
3029         }
3030         if (test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) {
3031                 /* Presumably interrupt handler couldn't delete the timer */
3032                 dev_warn(host->dev, "CTO timeout when already completed\n");
3033                 goto exit;
3034         }
3035
3036         /*
3037          * Continued paranoia to make sure we're in the state we expect.
3038          * This paranoia isn't really justified but it seems good to be safe.
3039          */
3040         switch (host->state) {
3041         case STATE_SENDING_CMD11:
3042         case STATE_SENDING_CMD:
3043         case STATE_SENDING_STOP:
3044                 /*
3045                  * If CMD_DONE interrupt does NOT come in sending command
3046                  * state, we should notify the driver to terminate current
3047                  * transfer and report a command timeout to the core.
3048                  */
3049                 host->cmd_status = SDMMC_INT_RTO;
3050                 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
3051                 tasklet_schedule(&host->tasklet);
3052                 break;
3053         default:
3054                 dev_warn(host->dev, "Unexpected command timeout, state %d\n",
3055                          host->state);
3056                 break;
3057         }
3058
3059 exit:
3060         spin_unlock_irqrestore(&host->irq_lock, irqflags);
3061 }
3062
3063 static void dw_mci_dto_timer(struct timer_list *t)
3064 {
3065         struct dw_mci *host = from_timer(host, t, dto_timer);
3066         unsigned long irqflags;
3067         u32 pending;
3068
3069         spin_lock_irqsave(&host->irq_lock, irqflags);
3070
3071         /*
3072          * The DTO timer is much longer than the CTO timer, so it's even less
3073          * likely that we'll these cases, but it pays to be paranoid.
3074          */
3075         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
3076         if (pending & SDMMC_INT_DATA_OVER) {
3077                 /* The interrupt should fire; no need to act but we can warn */
3078                 dev_warn(host->dev, "Unexpected data interrupt latency\n");
3079                 goto exit;
3080         }
3081         if (test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) {
3082                 /* Presumably interrupt handler couldn't delete the timer */
3083                 dev_warn(host->dev, "DTO timeout when already completed\n");
3084                 goto exit;
3085         }
3086
3087         /*
3088          * Continued paranoia to make sure we're in the state we expect.
3089          * This paranoia isn't really justified but it seems good to be safe.
3090          */
3091         switch (host->state) {
3092         case STATE_SENDING_DATA:
3093         case STATE_DATA_BUSY:
3094                 /*
3095                  * If DTO interrupt does NOT come in sending data state,
3096                  * we should notify the driver to terminate current transfer
3097                  * and report a data timeout to the core.
3098                  */
3099                 host->data_status = SDMMC_INT_DRTO;
3100                 set_bit(EVENT_DATA_ERROR, &host->pending_events);
3101                 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
3102                 tasklet_schedule(&host->tasklet);
3103                 break;
3104         default:
3105                 dev_warn(host->dev, "Unexpected data timeout, state %d\n",
3106                          host->state);
3107                 break;
3108         }
3109
3110 exit:
3111         spin_unlock_irqrestore(&host->irq_lock, irqflags);
3112 }
3113
3114 #ifdef CONFIG_OF
3115 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
3116 {
3117         struct dw_mci_board *pdata;
3118         struct device *dev = host->dev;
3119         const struct dw_mci_drv_data *drv_data = host->drv_data;
3120         int ret;
3121         u32 clock_frequency;
3122
3123         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
3124         if (!pdata)
3125                 return ERR_PTR(-ENOMEM);
3126
3127         /* find reset controller when exist */
3128         pdata->rstc = devm_reset_control_get_optional_exclusive(dev, "reset");
3129         if (IS_ERR(pdata->rstc)) {
3130                 if (PTR_ERR(pdata->rstc) == -EPROBE_DEFER)
3131                         return ERR_PTR(-EPROBE_DEFER);
3132         }
3133
3134         /* find out number of slots supported */
3135         if (!device_property_read_u32(dev, "num-slots", &pdata->num_slots))
3136                 dev_info(dev, "'num-slots' was deprecated.\n");
3137
3138         if (device_property_read_u32(dev, "fifo-depth", &pdata->fifo_depth))
3139                 dev_info(dev,
3140                          "fifo-depth property not found, using value of FIFOTH register as default\n");
3141
3142         device_property_read_u32(dev, "card-detect-delay",
3143                                  &pdata->detect_delay_ms);
3144
3145         device_property_read_u32(dev, "data-addr", &host->data_addr_override);
3146
3147         if (device_property_present(dev, "fifo-watermark-aligned"))
3148                 host->wm_aligned = true;
3149
3150         if (!device_property_read_u32(dev, "clock-frequency", &clock_frequency))
3151                 pdata->bus_hz = clock_frequency;
3152
3153         if (drv_data && drv_data->parse_dt) {
3154                 ret = drv_data->parse_dt(host);
3155                 if (ret)
3156                         return ERR_PTR(ret);
3157         }
3158
3159         return pdata;
3160 }
3161
3162 #else /* CONFIG_OF */
3163 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
3164 {
3165         return ERR_PTR(-EINVAL);
3166 }
3167 #endif /* CONFIG_OF */
3168
3169 static void dw_mci_enable_cd(struct dw_mci *host)
3170 {
3171         unsigned long irqflags;
3172         u32 temp;
3173
3174         /*
3175          * No need for CD if all slots have a non-error GPIO
3176          * as well as broken card detection is found.
3177          */
3178         if (host->slot->mmc->caps & MMC_CAP_NEEDS_POLL)
3179                 return;
3180
3181         if (mmc_gpio_get_cd(host->slot->mmc) < 0) {
3182                 spin_lock_irqsave(&host->irq_lock, irqflags);
3183                 temp = mci_readl(host, INTMASK);
3184                 temp  |= SDMMC_INT_CD;
3185                 mci_writel(host, INTMASK, temp);
3186                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
3187         }
3188 }
3189
3190 int dw_mci_probe(struct dw_mci *host)
3191 {
3192         const struct dw_mci_drv_data *drv_data = host->drv_data;
3193         int width, i, ret = 0;
3194         u32 fifo_size;
3195
3196         if (!host->pdata) {
3197                 host->pdata = dw_mci_parse_dt(host);
3198                 if (PTR_ERR(host->pdata) == -EPROBE_DEFER) {
3199                         return -EPROBE_DEFER;
3200                 } else if (IS_ERR(host->pdata)) {
3201                         dev_err(host->dev, "platform data not available\n");
3202                         return -EINVAL;
3203                 }
3204         }
3205
3206         host->biu_clk = devm_clk_get(host->dev, "biu");
3207         if (IS_ERR(host->biu_clk)) {
3208                 dev_dbg(host->dev, "biu clock not available\n");
3209         } else {
3210                 ret = clk_prepare_enable(host->biu_clk);
3211                 if (ret) {
3212                         dev_err(host->dev, "failed to enable biu clock\n");
3213                         return ret;
3214                 }
3215         }
3216
3217         host->ciu_clk = devm_clk_get(host->dev, "ciu");
3218         if (IS_ERR(host->ciu_clk)) {
3219                 dev_dbg(host->dev, "ciu clock not available\n");
3220                 host->bus_hz = host->pdata->bus_hz;
3221         } else {
3222                 ret = clk_prepare_enable(host->ciu_clk);
3223                 if (ret) {
3224                         dev_err(host->dev, "failed to enable ciu clock\n");
3225                         goto err_clk_biu;
3226                 }
3227
3228                 if (host->pdata->bus_hz) {
3229                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
3230                         if (ret)
3231                                 dev_warn(host->dev,
3232                                          "Unable to set bus rate to %uHz\n",
3233                                          host->pdata->bus_hz);
3234                 }
3235                 host->bus_hz = clk_get_rate(host->ciu_clk);
3236         }
3237
3238         if (!host->bus_hz) {
3239                 dev_err(host->dev,
3240                         "Platform data must supply bus speed\n");
3241                 ret = -ENODEV;
3242                 goto err_clk_ciu;
3243         }
3244
3245         if (!IS_ERR(host->pdata->rstc)) {
3246                 reset_control_assert(host->pdata->rstc);
3247                 usleep_range(10, 50);
3248                 reset_control_deassert(host->pdata->rstc);
3249         }
3250
3251         if (drv_data && drv_data->init) {
3252                 ret = drv_data->init(host);
3253                 if (ret) {
3254                         dev_err(host->dev,
3255                                 "implementation specific init failed\n");
3256                         goto err_clk_ciu;
3257                 }
3258         }
3259
3260         timer_setup(&host->cmd11_timer, dw_mci_cmd11_timer, 0);
3261         timer_setup(&host->cto_timer, dw_mci_cto_timer, 0);
3262         timer_setup(&host->dto_timer, dw_mci_dto_timer, 0);
3263
3264         spin_lock_init(&host->lock);
3265         spin_lock_init(&host->irq_lock);
3266         INIT_LIST_HEAD(&host->queue);
3267
3268         /*
3269          * Get the host data width - this assumes that HCON has been set with
3270          * the correct values.
3271          */
3272         i = SDMMC_GET_HDATA_WIDTH(mci_readl(host, HCON));
3273         if (!i) {
3274                 host->push_data = dw_mci_push_data16;
3275                 host->pull_data = dw_mci_pull_data16;
3276                 width = 16;
3277                 host->data_shift = 1;
3278         } else if (i == 2) {
3279                 host->push_data = dw_mci_push_data64;
3280                 host->pull_data = dw_mci_pull_data64;
3281                 width = 64;
3282                 host->data_shift = 3;
3283         } else {
3284                 /* Check for a reserved value, and warn if it is */
3285                 WARN((i != 1),
3286                      "HCON reports a reserved host data width!\n"
3287                      "Defaulting to 32-bit access.\n");
3288                 host->push_data = dw_mci_push_data32;
3289                 host->pull_data = dw_mci_pull_data32;
3290                 width = 32;
3291                 host->data_shift = 2;
3292         }
3293
3294         /* Reset all blocks */
3295         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3296                 ret = -ENODEV;
3297                 goto err_clk_ciu;
3298         }
3299
3300         host->dma_ops = host->pdata->dma_ops;
3301         dw_mci_init_dma(host);
3302
3303         /* Clear the interrupts for the host controller */
3304         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3305         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3306
3307         /* Put in max timeout */
3308         mci_writel(host, TMOUT, 0xFFFFFFFF);
3309
3310         /*
3311          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
3312          *                          Tx Mark = fifo_size / 2 DMA Size = 8
3313          */
3314         if (!host->pdata->fifo_depth) {
3315                 /*
3316                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
3317                  * have been overwritten by the bootloader, just like we're
3318                  * about to do, so if you know the value for your hardware, you
3319                  * should put it in the platform data.
3320                  */
3321                 fifo_size = mci_readl(host, FIFOTH);
3322                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
3323         } else {
3324                 fifo_size = host->pdata->fifo_depth;
3325         }
3326         host->fifo_depth = fifo_size;
3327         host->fifoth_val =
3328                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
3329         mci_writel(host, FIFOTH, host->fifoth_val);
3330
3331         /* disable clock to CIU */
3332         mci_writel(host, CLKENA, 0);
3333         mci_writel(host, CLKSRC, 0);
3334
3335         /*
3336          * In 2.40a spec, Data offset is changed.
3337          * Need to check the version-id and set data-offset for DATA register.
3338          */
3339         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
3340         dev_info(host->dev, "Version ID is %04x\n", host->verid);
3341
3342         if (host->data_addr_override)
3343                 host->fifo_reg = host->regs + host->data_addr_override;
3344         else if (host->verid < DW_MMC_240A)
3345                 host->fifo_reg = host->regs + DATA_OFFSET;
3346         else
3347                 host->fifo_reg = host->regs + DATA_240A_OFFSET;
3348
3349         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
3350         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
3351                                host->irq_flags, "dw-mci", host);
3352         if (ret)
3353                 goto err_dmaunmap;
3354
3355         /*
3356          * Enable interrupts for command done, data over, data empty,
3357          * receive ready and error such as transmit, receive timeout, crc error
3358          */
3359         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3360                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3361                    DW_MCI_ERROR_FLAGS);
3362         /* Enable mci interrupt */
3363         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3364
3365         dev_info(host->dev,
3366                  "DW MMC controller at irq %d,%d bit host data width,%u deep fifo\n",
3367                  host->irq, width, fifo_size);
3368
3369         /* We need at least one slot to succeed */
3370         ret = dw_mci_init_slot(host);
3371         if (ret) {
3372                 dev_dbg(host->dev, "slot %d init failed\n", i);
3373                 goto err_dmaunmap;
3374         }
3375
3376         /* Now that slots are all setup, we can enable card detect */
3377         dw_mci_enable_cd(host);
3378
3379         return 0;
3380
3381 err_dmaunmap:
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 err_clk_ciu:
3389         clk_disable_unprepare(host->ciu_clk);
3390
3391 err_clk_biu:
3392         clk_disable_unprepare(host->biu_clk);
3393
3394         return ret;
3395 }
3396 EXPORT_SYMBOL(dw_mci_probe);
3397
3398 void dw_mci_remove(struct dw_mci *host)
3399 {
3400         dev_dbg(host->dev, "remove slot\n");
3401         if (host->slot)
3402                 dw_mci_cleanup_slot(host->slot);
3403
3404         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3405         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3406
3407         /* disable clock to CIU */
3408         mci_writel(host, CLKENA, 0);
3409         mci_writel(host, CLKSRC, 0);
3410
3411         if (host->use_dma && host->dma_ops->exit)
3412                 host->dma_ops->exit(host);
3413
3414         if (!IS_ERR(host->pdata->rstc))
3415                 reset_control_assert(host->pdata->rstc);
3416
3417         clk_disable_unprepare(host->ciu_clk);
3418         clk_disable_unprepare(host->biu_clk);
3419 }
3420 EXPORT_SYMBOL(dw_mci_remove);
3421
3422
3423
3424 #ifdef CONFIG_PM
3425 int dw_mci_runtime_suspend(struct device *dev)
3426 {
3427         struct dw_mci *host = dev_get_drvdata(dev);
3428
3429         if (host->use_dma && host->dma_ops->exit)
3430                 host->dma_ops->exit(host);
3431
3432         clk_disable_unprepare(host->ciu_clk);
3433
3434         if (host->slot &&
3435             (mmc_can_gpio_cd(host->slot->mmc) ||
3436              !mmc_card_is_removable(host->slot->mmc)))
3437                 clk_disable_unprepare(host->biu_clk);
3438
3439         return 0;
3440 }
3441 EXPORT_SYMBOL(dw_mci_runtime_suspend);
3442
3443 int dw_mci_runtime_resume(struct device *dev)
3444 {
3445         int ret = 0;
3446         struct dw_mci *host = dev_get_drvdata(dev);
3447
3448         if (host->slot &&
3449             (mmc_can_gpio_cd(host->slot->mmc) ||
3450              !mmc_card_is_removable(host->slot->mmc))) {
3451                 ret = clk_prepare_enable(host->biu_clk);
3452                 if (ret)
3453                         return ret;
3454         }
3455
3456         ret = clk_prepare_enable(host->ciu_clk);
3457         if (ret)
3458                 goto err;
3459
3460         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3461                 clk_disable_unprepare(host->ciu_clk);
3462                 ret = -ENODEV;
3463                 goto err;
3464         }
3465
3466         if (host->use_dma && host->dma_ops->init)
3467                 host->dma_ops->init(host);
3468
3469         /*
3470          * Restore the initial value at FIFOTH register
3471          * And Invalidate the prev_blksz with zero
3472          */
3473          mci_writel(host, FIFOTH, host->fifoth_val);
3474          host->prev_blksz = 0;
3475
3476         /* Put in max timeout */
3477         mci_writel(host, TMOUT, 0xFFFFFFFF);
3478
3479         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3480         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3481                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3482                    DW_MCI_ERROR_FLAGS);
3483         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3484
3485
3486         if (host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER)
3487                 dw_mci_set_ios(host->slot->mmc, &host->slot->mmc->ios);
3488
3489         /* Force setup bus to guarantee available clock output */
3490         dw_mci_setup_bus(host->slot, true);
3491
3492         /* Now that slots are all setup, we can enable card detect */
3493         dw_mci_enable_cd(host);
3494
3495         return 0;
3496
3497 err:
3498         if (host->slot &&
3499             (mmc_can_gpio_cd(host->slot->mmc) ||
3500              !mmc_card_is_removable(host->slot->mmc)))
3501                 clk_disable_unprepare(host->biu_clk);
3502
3503         return ret;
3504 }
3505 EXPORT_SYMBOL(dw_mci_runtime_resume);
3506 #endif /* CONFIG_PM */
3507
3508 static int __init dw_mci_init(void)
3509 {
3510         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
3511         return 0;
3512 }
3513
3514 static void __exit dw_mci_exit(void)
3515 {
3516 }
3517
3518 module_init(dw_mci_init);
3519 module_exit(dw_mci_exit);
3520
3521 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
3522 MODULE_AUTHOR("NXP Semiconductor VietNam");
3523 MODULE_AUTHOR("Imagination Technologies Ltd");
3524 MODULE_LICENSE("GPL v2");