drivers/mmc/host/atmel-mci.c

   1 /*
   2  * Atmel MultiMedia Card Interface driver
   3  *
   4  * Copyright (C) 2004-2008 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/blkdev.h>
  11 #include <linux/clk.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/device.h>
  14 #include <linux/dmaengine.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/err.h>
  17 #include <linux/gpio.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/ioport.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/scatterlist.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/slab.h>
  29 #include <linux/stat.h>
  30 #include <linux/types.h>
  31
  32 #include <linux/mmc/host.h>
  33 #include <linux/mmc/sdio.h>
  34
  35 #include <mach/atmel-mci.h>
  36 #include <linux/atmel-mci.h>
  37 #include <linux/atmel_pdc.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/unaligned.h>
  41
  42 #include <mach/cpu.h>
  43 #include <mach/board.h>
  44
  45 #include "atmel-mci-regs.h"
  46
  47 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
  48 #define ATMCI_DMA_THRESHOLD     16
  49
  50 enum {
  51         EVENT_CMD_RDY = 0,
  52         EVENT_XFER_COMPLETE,
  53         EVENT_NOTBUSY,
  54         EVENT_DATA_ERROR,
  55 };
  56
  57 enum atmel_mci_state {
  58         STATE_IDLE = 0,
  59         STATE_SENDING_CMD,
  60         STATE_DATA_XFER,
  61         STATE_WAITING_NOTBUSY,
  62         STATE_SENDING_STOP,
  63         STATE_END_REQUEST,
  64 };
  65
  66 enum atmci_xfer_dir {
  67         XFER_RECEIVE = 0,
  68         XFER_TRANSMIT,
  69 };
  70
  71 enum atmci_pdc_buf {
  72         PDC_FIRST_BUF = 0,
  73         PDC_SECOND_BUF,
  74 };
  75
  76 struct atmel_mci_caps {
  77         bool    has_dma_conf_reg;
  78         bool    has_pdc;
  79         bool    has_cfg_reg;
  80         bool    has_cstor_reg;
  81         bool    has_highspeed;
  82         bool    has_rwproof;
  83         bool    has_odd_clk_div;
  84         bool    has_bad_data_ordering;
  85         bool    need_reset_after_xfer;
  86         bool    need_blksz_mul_4;
  87         bool    need_notbusy_for_read_ops;
  88 };
  89
  90 struct atmel_mci_dma {
  91         struct dma_chan                 *chan;
  92         struct dma_async_tx_descriptor  *data_desc;
  93 };
  94
  95 /**
  96  * struct atmel_mci - MMC controller state shared between all slots
  97  * @lock: Spinlock protecting the queue and associated data.
  98  * @regs: Pointer to MMIO registers.
  99  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
 100  * @pio_offset: Offset into the current scatterlist entry.
 101  * @buffer: Buffer used if we don't have the r/w proof capability. We
 102  *      don't have the time to switch pdc buffers so we have to use only
 103  *      one buffer for the full transaction.
 104  * @buf_size: size of the buffer.
 105  * @phys_buf_addr: buffer address needed for pdc.
 106  * @cur_slot: The slot which is currently using the controller.
 107  * @mrq: The request currently being processed on @cur_slot,
 108  *      or NULL if the controller is idle.
 109  * @cmd: The command currently being sent to the card, or NULL.
 110  * @data: The data currently being transferred, or NULL if no data
 111  *      transfer is in progress.
 112  * @data_size: just data->blocks * data->blksz.
 113  * @dma: DMA client state.
 114  * @data_chan: DMA channel being used for the current data transfer.
 115  * @cmd_status: Snapshot of SR taken upon completion of the current
 116  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
 117  * @data_status: Snapshot of SR taken upon completion of the current
 118  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
 119  *      EVENT_DATA_ERROR is pending.
 120  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
 121  *      to be sent.
 122  * @tasklet: Tasklet running the request state machine.
 123  * @pending_events: Bitmask of events flagged by the interrupt handler
 124  *      to be processed by the tasklet.
 125  * @completed_events: Bitmask of events which the state machine has
 126  *      processed.
 127  * @state: Tasklet state.
 128  * @queue: List of slots waiting for access to the controller.
 129  * @need_clock_update: Update the clock rate before the next request.
 130  * @need_reset: Reset controller before next request.
 131  * @timer: Timer to balance the data timeout error flag which cannot rise.
 132  * @mode_reg: Value of the MR register.
 133  * @cfg_reg: Value of the CFG register.
 134  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
 135  *      rate and timeout calculations.
 136  * @mapbase: Physical address of the MMIO registers.
 137  * @mck: The peripheral bus clock hooked up to the MMC controller.
 138  * @pdev: Platform device associated with the MMC controller.
 139  * @slot: Slots sharing this MMC controller.
 140  * @caps: MCI capabilities depending on MCI version.
 141  * @prepare_data: function to setup MCI before data transfer which
 142  * depends on MCI capabilities.
 143  * @submit_data: function to start data transfer which depends on MCI
 144  * capabilities.
 145  * @stop_transfer: function to stop data transfer which depends on MCI
 146  * capabilities.
 147  *
 148  * Locking
 149  * =======
 150  *
 151  * @lock is a softirq-safe spinlock protecting @queue as well as
 152  * @cur_slot, @mrq and @state. These must always be updated
 153  * at the same time while holding @lock.
 154  *
 155  * @lock also protects mode_reg and need_clock_update since these are
 156  * used to synchronize mode register updates with the queue
 157  * processing.
 158  *
 159  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
 160  * and must always be written at the same time as the slot is added to
 161  * @queue.
 162  *
 163  * @pending_events and @completed_events are accessed using atomic bit
 164  * operations, so they don't need any locking.
 165  *
 166  * None of the fields touched by the interrupt handler need any
 167  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 168  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 169  * interrupts must be disabled and @data_status updated with a
 170  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 171  * CMDRDY interrupt must be disabled and @cmd_status updated with a
 172  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 173  * bytes_xfered field of @data must be written. This is ensured by
 174  * using barriers.
 175  */
 176 struct atmel_mci {
 177         spinlock_t              lock;
 178         void __iomem            *regs;
 179
 180         struct scatterlist      *sg;
 181         unsigned int            pio_offset;
 182         unsigned int            *buffer;
 183         unsigned int            buf_size;
 184         dma_addr_t              buf_phys_addr;
 185
 186         struct atmel_mci_slot   *cur_slot;
 187         struct mmc_request      *mrq;
 188         struct mmc_command      *cmd;
 189         struct mmc_data         *data;
 190         unsigned int            data_size;
 191
 192         struct atmel_mci_dma    dma;
 193         struct dma_chan         *data_chan;
 194         struct dma_slave_config dma_conf;
 195
 196         u32                     cmd_status;
 197         u32                     data_status;
 198         u32                     stop_cmdr;
 199
 200         struct tasklet_struct   tasklet;
 201         unsigned long           pending_events;
 202         unsigned long           completed_events;
 203         enum atmel_mci_state    state;
 204         struct list_head        queue;
 205
 206         bool                    need_clock_update;
 207         bool                    need_reset;
 208         struct timer_list       timer;
 209         u32                     mode_reg;
 210         u32                     cfg_reg;
 211         unsigned long           bus_hz;
 212         unsigned long           mapbase;
 213         struct clk              *mck;
 214         struct platform_device  *pdev;
 215
 216         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
 217
 218         struct atmel_mci_caps   caps;
 219
 220         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
 221         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
 222         void (*stop_transfer)(struct atmel_mci *host);
 223 };
 224
 225 /**
 226  * struct atmel_mci_slot - MMC slot state
 227  * @mmc: The mmc_host representing this slot.
 228  * @host: The MMC controller this slot is using.
 229  * @sdc_reg: Value of SDCR to be written before using this slot.
 230  * @sdio_irq: SDIO irq mask for this slot.
 231  * @mrq: mmc_request currently being processed or waiting to be
 232  *      processed, or NULL when the slot is idle.
 233  * @queue_node: List node for placing this node in the @queue list of
 234  *      &struct atmel_mci.
 235  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
 236  * @flags: Random state bits associated with the slot.
 237  * @detect_pin: GPIO pin used for card detection, or negative if not
 238  *      available.
 239  * @wp_pin: GPIO pin used for card write protect sending, or negative
 240  *      if not available.
 241  * @detect_is_active_high: The state of the detect pin when it is active.
 242  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
 243  */
 244 struct atmel_mci_slot {
 245         struct mmc_host         *mmc;
 246         struct atmel_mci        *host;
 247
 248         u32                     sdc_reg;
 249         u32                     sdio_irq;
 250
 251         struct mmc_request      *mrq;
 252         struct list_head        queue_node;
 253
 254         unsigned int            clock;
 255         unsigned long           flags;
 256 #define ATMCI_CARD_PRESENT      0
 257 #define ATMCI_CARD_NEED_INIT    1
 258 #define ATMCI_SHUTDOWN          2
 259 #define ATMCI_SUSPENDED         3
 260
 261         int                     detect_pin;
 262         int                     wp_pin;
 263         bool                    detect_is_active_high;
 264
 265         struct timer_list       detect_timer;
 266 };
 267
 268 #define atmci_test_and_clear_pending(host, event)               \
 269         test_and_clear_bit(event, &host->pending_events)
 270 #define atmci_set_completed(host, event)                        \
 271         set_bit(event, &host->completed_events)
 272 #define atmci_set_pending(host, event)                          \
 273         set_bit(event, &host->pending_events)
 274
 275 /*
 276  * The debugfs stuff below is mostly optimized away when
 277  * CONFIG_DEBUG_FS is not set.
 278  */
 279 static int atmci_req_show(struct seq_file *s, void *v)
 280 {
 281         struct atmel_mci_slot   *slot = s->private;
 282         struct mmc_request      *mrq;
 283         struct mmc_command      *cmd;
 284         struct mmc_command      *stop;
 285         struct mmc_data         *data;
 286
 287         /* Make sure we get a consistent snapshot */
 288         spin_lock_bh(&slot->host->lock);
 289         mrq = slot->mrq;
 290
 291         if (mrq) {
 292                 cmd = mrq->cmd;
 293                 data = mrq->data;
 294                 stop = mrq->stop;
 295
 296                 if (cmd)
 297                         seq_printf(s,
 298                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 299                                 cmd->opcode, cmd->arg, cmd->flags,
 300                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
 301                                 cmd->resp[3], cmd->error);
 302                 if (data)
 303                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
 304                                 data->bytes_xfered, data->blocks,
 305                                 data->blksz, data->flags, data->error);
 306                 if (stop)
 307                         seq_printf(s,
 308                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 309                                 stop->opcode, stop->arg, stop->flags,
 310                                 stop->resp[0], stop->resp[1], stop->resp[2],
 311                                 stop->resp[3], stop->error);
 312         }
 313
 314         spin_unlock_bh(&slot->host->lock);
 315
 316         return 0;
 317 }
 318
 319 static int atmci_req_open(struct inode *inode, struct file *file)
 320 {
 321         return single_open(file, atmci_req_show, inode->i_private);
 322 }
 323
 324 static const struct file_operations atmci_req_fops = {
 325         .owner          = THIS_MODULE,
 326         .open           = atmci_req_open,
 327         .read           = seq_read,
 328         .llseek         = seq_lseek,
 329         .release        = single_release,
 330 };
 331
 332 static void atmci_show_status_reg(struct seq_file *s,
 333                 const char *regname, u32 value)
 334 {
 335         static const char       *sr_bit[] = {
 336                 [0]     = "CMDRDY",
 337                 [1]     = "RXRDY",
 338                 [2]     = "TXRDY",
 339                 [3]     = "BLKE",
 340                 [4]     = "DTIP",
 341                 [5]     = "NOTBUSY",
 342                 [6]     = "ENDRX",
 343                 [7]     = "ENDTX",
 344                 [8]     = "SDIOIRQA",
 345                 [9]     = "SDIOIRQB",
 346                 [12]    = "SDIOWAIT",
 347                 [14]    = "RXBUFF",
 348                 [15]    = "TXBUFE",
 349                 [16]    = "RINDE",
 350                 [17]    = "RDIRE",
 351                 [18]    = "RCRCE",
 352                 [19]    = "RENDE",
 353                 [20]    = "RTOE",
 354                 [21]    = "DCRCE",
 355                 [22]    = "DTOE",
 356                 [23]    = "CSTOE",
 357                 [24]    = "BLKOVRE",
 358                 [25]    = "DMADONE",
 359                 [26]    = "FIFOEMPTY",
 360                 [27]    = "XFRDONE",
 361                 [30]    = "OVRE",
 362                 [31]    = "UNRE",
 363         };
 364         unsigned int            i;
 365
 366         seq_printf(s, "%s:\t0x%08x", regname, value);
 367         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
 368                 if (value & (1 << i)) {
 369                         if (sr_bit[i])
 370                                 seq_printf(s, " %s", sr_bit[i]);
 371                         else
 372                                 seq_puts(s, " UNKNOWN");
 373                 }
 374         }
 375         seq_putc(s, '\n');
 376 }
 377
 378 static int atmci_regs_show(struct seq_file *s, void *v)
 379 {
 380         struct atmel_mci        *host = s->private;
 381         u32                     *buf;
 382
 383         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
 384         if (!buf)
 385                 return -ENOMEM;
 386
 387         /*
 388          * Grab a more or less consistent snapshot. Note that we're
 389          * not disabling interrupts, so IMR and SR may not be
 390          * consistent.
 391          */
 392         spin_lock_bh(&host->lock);
 393         clk_enable(host->mck);
 394         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
 395         clk_disable(host->mck);
 396         spin_unlock_bh(&host->lock);
 397
 398         seq_printf(s, "MR:\t0x%08x%s%s ",
 399                         buf[ATMCI_MR / 4],
 400                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
 401                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
 402         if (host->caps.has_odd_clk_div)
 403                 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
 404                                 ((buf[ATMCI_MR / 4] & 0xff) << 1)
 405                                 | ((buf[ATMCI_MR / 4] >> 16) & 1));
 406         else
 407                 seq_printf(s, "CLKDIV=%u\n",
 408                                 (buf[ATMCI_MR / 4] & 0xff));
 409         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
 410         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
 411         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
 412         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
 413                         buf[ATMCI_BLKR / 4],
 414                         buf[ATMCI_BLKR / 4] & 0xffff,
 415                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
 416         if (host->caps.has_cstor_reg)
 417                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
 418
 419         /* Don't read RSPR and RDR; it will consume the data there */
 420
 421         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
 422         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
 423
 424         if (host->caps.has_dma_conf_reg) {
 425                 u32 val;
 426
 427                 val = buf[ATMCI_DMA / 4];
 428                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
 429                                 val, val & 3,
 430                                 ((val >> 4) & 3) ?
 431                                         1 << (((val >> 4) & 3) + 1) : 1,
 432                                 val & ATMCI_DMAEN ? " DMAEN" : "");
 433         }
 434         if (host->caps.has_cfg_reg) {
 435                 u32 val;
 436
 437                 val = buf[ATMCI_CFG / 4];
 438                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
 439                                 val,
 440                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
 441                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
 442                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
 443                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
 444         }
 445
 446         kfree(buf);
 447
 448         return 0;
 449 }
 450
 451 static int atmci_regs_open(struct inode *inode, struct file *file)
 452 {
 453         return single_open(file, atmci_regs_show, inode->i_private);
 454 }
 455
 456 static const struct file_operations atmci_regs_fops = {
 457         .owner          = THIS_MODULE,
 458         .open           = atmci_regs_open,
 459         .read           = seq_read,
 460         .llseek         = seq_lseek,
 461         .release        = single_release,
 462 };
 463
 464 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
 465 {
 466         struct mmc_host         *mmc = slot->mmc;
 467         struct atmel_mci        *host = slot->host;
 468         struct dentry           *root;
 469         struct dentry           *node;
 470
 471         root = mmc->debugfs_root;
 472         if (!root)
 473                 return;
 474
 475         node = debugfs_create_file("regs", S_IRUSR, root, host,
 476                         &atmci_regs_fops);
 477         if (IS_ERR(node))
 478                 return;
 479         if (!node)
 480                 goto err;
 481
 482         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
 483         if (!node)
 484                 goto err;
 485
 486         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
 487         if (!node)
 488                 goto err;
 489
 490         node = debugfs_create_x32("pending_events", S_IRUSR, root,
 491                                      (u32 *)&host->pending_events);
 492         if (!node)
 493                 goto err;
 494
 495         node = debugfs_create_x32("completed_events", S_IRUSR, root,
 496                                      (u32 *)&host->completed_events);
 497         if (!node)
 498                 goto err;
 499
 500         return;
 501
 502 err:
 503         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
 504 }
 505
 506 #if defined(CONFIG_OF)
 507 static const struct of_device_id atmci_dt_ids[] = {
 508         { .compatible = "atmel,hsmci" },
 509         { /* sentinel */ }
 510 };
 511
 512 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
 513
 514 static struct mci_platform_data __devinit*
 515 atmci_of_init(struct platform_device *pdev)
 516 {
 517         struct device_node *np = pdev->dev.of_node;
 518         struct device_node *cnp;
 519         struct mci_platform_data *pdata;
 520         u32 slot_id;
 521
 522         if (!np) {
 523                 dev_err(&pdev->dev, "device node not found\n");
 524                 return ERR_PTR(-EINVAL);
 525         }
 526
 527         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 528         if (!pdata) {
 529                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
 530                 return ERR_PTR(-ENOMEM);
 531         }
 532
 533         for_each_child_of_node(np, cnp) {
 534                 if (of_property_read_u32(cnp, "reg", &slot_id)) {
 535                         dev_warn(&pdev->dev, "reg property is missing for %s\n",
 536                                  cnp->full_name);
 537                         continue;
 538                 }
 539
 540                 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
 541                         dev_warn(&pdev->dev, "can't have more than %d slots\n",
 542                                  ATMCI_MAX_NR_SLOTS);
 543                         break;
 544                 }
 545
 546                 if (of_property_read_u32(cnp, "bus-width",
 547                                          &pdata->slot[slot_id].bus_width))
 548                         pdata->slot[slot_id].bus_width = 1;
 549
 550                 pdata->slot[slot_id].detect_pin =
 551                         of_get_named_gpio(cnp, "cd-gpios", 0);
 552
 553                 pdata->slot[slot_id].detect_is_active_high =
 554                         of_property_read_bool(cnp, "cd-inverted");
 555
 556                 pdata->slot[slot_id].wp_pin =
 557                         of_get_named_gpio(cnp, "wp-gpios", 0);
 558         }
 559
 560         return pdata;
 561 }
 562 #else /* CONFIG_OF */
 563 static inline struct mci_platform_data*
 564 atmci_of_init(struct platform_device *dev)
 565 {
 566         return ERR_PTR(-EINVAL);
 567 }
 568 #endif
 569
 570 static inline unsigned int atmci_get_version(struct atmel_mci *host)
 571 {
 572         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
 573 }
 574
 575 static void atmci_timeout_timer(unsigned long data)
 576 {
 577         struct atmel_mci *host;
 578
 579         host = (struct atmel_mci *)data;
 580
 581         dev_dbg(&host->pdev->dev, "software timeout\n");
 582
 583         if (host->mrq->cmd->data) {
 584                 host->mrq->cmd->data->error = -ETIMEDOUT;
 585                 host->data = NULL;
 586         } else {
 587                 host->mrq->cmd->error = -ETIMEDOUT;
 588                 host->cmd = NULL;
 589         }
 590         host->need_reset = 1;
 591         host->state = STATE_END_REQUEST;
 592         smp_wmb();
 593         tasklet_schedule(&host->tasklet);
 594 }
 595
 596 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
 597                                         unsigned int ns)
 598 {
 599         /*
 600          * It is easier here to use us instead of ns for the timeout,
 601          * it prevents from overflows during calculation.
 602          */
 603         unsigned int us = DIV_ROUND_UP(ns, 1000);
 604
 605         /* Maximum clock frequency is host->bus_hz/2 */
 606         return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
 607 }
 608
 609 static void atmci_set_timeout(struct atmel_mci *host,
 610                 struct atmel_mci_slot *slot, struct mmc_data *data)
 611 {
 612         static unsigned dtomul_to_shift[] = {
 613                 0, 4, 7, 8, 10, 12, 16, 20
 614         };
 615         unsigned        timeout;
 616         unsigned        dtocyc;
 617         unsigned        dtomul;
 618
 619         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
 620                 + data->timeout_clks;
 621
 622         for (dtomul = 0; dtomul < 8; dtomul++) {
 623                 unsigned shift = dtomul_to_shift[dtomul];
 624                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
 625                 if (dtocyc < 15)
 626                         break;
 627         }
 628
 629         if (dtomul >= 8) {
 630                 dtomul = 7;
 631                 dtocyc = 15;
 632         }
 633
 634         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
 635                         dtocyc << dtomul_to_shift[dtomul]);
 636         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
 637 }
 638
 639 /*
 640  * Return mask with command flags to be enabled for this command.
 641  */
 642 static u32 atmci_prepare_command(struct mmc_host *mmc,
 643                                  struct mmc_command *cmd)
 644 {
 645         struct mmc_data *data;
 646         u32             cmdr;
 647
 648         cmd->error = -EINPROGRESS;
 649
 650         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
 651
 652         if (cmd->flags & MMC_RSP_PRESENT) {
 653                 if (cmd->flags & MMC_RSP_136)
 654                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
 655                 else
 656                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
 657         }
 658
 659         /*
 660          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
 661          * it's too difficult to determine whether this is an ACMD or
 662          * not. Better make it 64.
 663          */
 664         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
 665
 666         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
 667                 cmdr |= ATMCI_CMDR_OPDCMD;
 668
 669         data = cmd->data;
 670         if (data) {
 671                 cmdr |= ATMCI_CMDR_START_XFER;
 672
 673                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
 674                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
 675                 } else {
 676                         if (data->flags & MMC_DATA_STREAM)
 677                                 cmdr |= ATMCI_CMDR_STREAM;
 678                         else if (data->blocks > 1)
 679                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
 680                         else
 681                                 cmdr |= ATMCI_CMDR_BLOCK;
 682                 }
 683
 684                 if (data->flags & MMC_DATA_READ)
 685                         cmdr |= ATMCI_CMDR_TRDIR_READ;
 686         }
 687
 688         return cmdr;
 689 }
 690
 691 static void atmci_send_command(struct atmel_mci *host,
 692                 struct mmc_command *cmd, u32 cmd_flags)
 693 {
 694         WARN_ON(host->cmd);
 695         host->cmd = cmd;
 696
 697         dev_vdbg(&host->pdev->dev,
 698                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
 699                         cmd->arg, cmd_flags);
 700
 701         atmci_writel(host, ATMCI_ARGR, cmd->arg);
 702         atmci_writel(host, ATMCI_CMDR, cmd_flags);
 703 }
 704
 705 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
 706 {
 707         dev_dbg(&host->pdev->dev, "send stop command\n");
 708         atmci_send_command(host, data->stop, host->stop_cmdr);
 709         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
 710 }
 711
 712 /*
 713  * Configure given PDC buffer taking care of alignement issues.
 714  * Update host->data_size and host->sg.
 715  */
 716 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
 717         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
 718 {
 719         u32 pointer_reg, counter_reg;
 720         unsigned int buf_size;
 721
 722         if (dir == XFER_RECEIVE) {
 723                 pointer_reg = ATMEL_PDC_RPR;
 724                 counter_reg = ATMEL_PDC_RCR;
 725         } else {
 726                 pointer_reg = ATMEL_PDC_TPR;
 727                 counter_reg = ATMEL_PDC_TCR;
 728         }
 729
 730         if (buf_nb == PDC_SECOND_BUF) {
 731                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
 732                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
 733         }
 734
 735         if (!host->caps.has_rwproof) {
 736                 buf_size = host->buf_size;
 737                 atmci_writel(host, pointer_reg, host->buf_phys_addr);
 738         } else {
 739                 buf_size = sg_dma_len(host->sg);
 740                 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
 741         }
 742
 743         if (host->data_size <= buf_size) {
 744                 if (host->data_size & 0x3) {
 745                         /* If size is different from modulo 4, transfer bytes */
 746                         atmci_writel(host, counter_reg, host->data_size);
 747                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
 748                 } else {
 749                         /* Else transfer 32-bits words */
 750                         atmci_writel(host, counter_reg, host->data_size / 4);
 751                 }
 752                 host->data_size = 0;
 753         } else {
 754                 /* We assume the size of a page is 32-bits aligned */
 755                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
 756                 host->data_size -= sg_dma_len(host->sg);
 757                 if (host->data_size)
 758                         host->sg = sg_next(host->sg);
 759         }
 760 }
 761
 762 /*
 763  * Configure PDC buffer according to the data size ie configuring one or two
 764  * buffers. Don't use this function if you want to configure only the second
 765  * buffer. In this case, use atmci_pdc_set_single_buf.
 766  */
 767 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
 768 {
 769         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
 770         if (host->data_size)
 771                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
 772 }
 773
 774 /*
 775  * Unmap sg lists, called when transfer is finished.
 776  */
 777 static void atmci_pdc_cleanup(struct atmel_mci *host)
 778 {
 779         struct mmc_data         *data = host->data;
 780
 781         if (data)
 782                 dma_unmap_sg(&host->pdev->dev,
 783                                 data->sg, data->sg_len,
 784                                 ((data->flags & MMC_DATA_WRITE)
 785                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
 786 }
 787
 788 /*
 789  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
 790  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
 791  * interrupt needed for both transfer directions.
 792  */
 793 static void atmci_pdc_complete(struct atmel_mci *host)
 794 {
 795         int transfer_size = host->data->blocks * host->data->blksz;
 796         int i;
 797
 798         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
 799
 800         if ((!host->caps.has_rwproof)
 801             && (host->data->flags & MMC_DATA_READ)) {
 802                 if (host->caps.has_bad_data_ordering)
 803                         for (i = 0; i < transfer_size; i++)
 804                                 host->buffer[i] = swab32(host->buffer[i]);
 805                 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
 806                                     host->buffer, transfer_size);
 807         }
 808
 809         atmci_pdc_cleanup(host);
 810
 811         /*
 812          * If the card was removed, data will be NULL. No point trying
 813          * to send the stop command or waiting for NBUSY in this case.
 814          */
 815         if (host->data) {
 816                 dev_dbg(&host->pdev->dev,
 817                         "(%s) set pending xfer complete\n", __func__);
 818                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
 819                 tasklet_schedule(&host->tasklet);
 820         }
 821 }
 822
 823 static void atmci_dma_cleanup(struct atmel_mci *host)
 824 {
 825         struct mmc_data                 *data = host->data;
 826
 827         if (data)
 828                 dma_unmap_sg(host->dma.chan->device->dev,
 829                                 data->sg, data->sg_len,
 830                                 ((data->flags & MMC_DATA_WRITE)
 831                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
 832 }
 833
 834 /*
 835  * This function is called by the DMA driver from tasklet context.
 836  */
 837 static void atmci_dma_complete(void *arg)
 838 {
 839         struct atmel_mci        *host = arg;
 840         struct mmc_data         *data = host->data;
 841
 842         dev_vdbg(&host->pdev->dev, "DMA complete\n");
 843
 844         if (host->caps.has_dma_conf_reg)
 845                 /* Disable DMA hardware handshaking on MCI */
 846                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
 847
 848         atmci_dma_cleanup(host);
 849
 850         /*
 851          * If the card was removed, data will be NULL. No point trying
 852          * to send the stop command or waiting for NBUSY in this case.
 853          */
 854         if (data) {
 855                 dev_dbg(&host->pdev->dev,
 856                         "(%s) set pending xfer complete\n", __func__);
 857                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
 858                 tasklet_schedule(&host->tasklet);
 859
 860                 /*
 861                  * Regardless of what the documentation says, we have
 862                  * to wait for NOTBUSY even after block read
 863                  * operations.
 864                  *
 865                  * When the DMA transfer is complete, the controller
 866                  * may still be reading the CRC from the card, i.e.
 867                  * the data transfer is still in progress and we
 868                  * haven't seen all the potential error bits yet.
 869                  *
 870                  * The interrupt handler will schedule a different
 871                  * tasklet to finish things up when the data transfer
 872                  * is completely done.
 873                  *
 874                  * We may not complete the mmc request here anyway
 875                  * because the mmc layer may call back and cause us to
 876                  * violate the "don't submit new operations from the
 877                  * completion callback" rule of the dma engine
 878                  * framework.
 879                  */
 880                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
 881         }
 882 }
 883
 884 /*
 885  * Returns a mask of interrupt flags to be enabled after the whole
 886  * request has been prepared.
 887  */
 888 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
 889 {
 890         u32 iflags;
 891
 892         data->error = -EINPROGRESS;
 893
 894         host->sg = data->sg;
 895         host->data = data;
 896         host->data_chan = NULL;
 897
 898         iflags = ATMCI_DATA_ERROR_FLAGS;
 899
 900         /*
 901          * Errata: MMC data write operation with less than 12
 902          * bytes is impossible.
 903          *
 904          * Errata: MCI Transmit Data Register (TDR) FIFO
 905          * corruption when length is not multiple of 4.
 906          */
 907         if (data->blocks * data->blksz < 12
 908                         || (data->blocks * data->blksz) & 3)
 909                 host->need_reset = true;
 910
 911         host->pio_offset = 0;
 912         if (data->flags & MMC_DATA_READ)
 913                 iflags |= ATMCI_RXRDY;
 914         else
 915                 iflags |= ATMCI_TXRDY;
 916
 917         return iflags;
 918 }
 919
 920 /*
 921  * Set interrupt flags and set block length into the MCI mode register even
 922  * if this value is also accessible in the MCI block register. It seems to be
 923  * necessary before the High Speed MCI version. It also map sg and configure
 924  * PDC registers.
 925  */
 926 static u32
 927 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
 928 {
 929         u32 iflags, tmp;
 930         unsigned int sg_len;
 931         enum dma_data_direction dir;
 932         int i;
 933
 934         data->error = -EINPROGRESS;
 935
 936         host->data = data;
 937         host->sg = data->sg;
 938         iflags = ATMCI_DATA_ERROR_FLAGS;
 939
 940         /* Enable pdc mode */
 941         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
 942
 943         if (data->flags & MMC_DATA_READ) {
 944                 dir = DMA_FROM_DEVICE;
 945                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
 946         } else {
 947                 dir = DMA_TO_DEVICE;
 948                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
 949         }
 950
 951         /* Set BLKLEN */
 952         tmp = atmci_readl(host, ATMCI_MR);
 953         tmp &= 0x0000ffff;
 954         tmp |= ATMCI_BLKLEN(data->blksz);
 955         atmci_writel(host, ATMCI_MR, tmp);
 956
 957         /* Configure PDC */
 958         host->data_size = data->blocks * data->blksz;
 959         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
 960
 961         if ((!host->caps.has_rwproof)
 962             && (host->data->flags & MMC_DATA_WRITE)) {
 963                 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
 964                                   host->buffer, host->data_size);
 965                 if (host->caps.has_bad_data_ordering)
 966                         for (i = 0; i < host->data_size; i++)
 967                                 host->buffer[i] = swab32(host->buffer[i]);
 968         }
 969
 970         if (host->data_size)
 971                 atmci_pdc_set_both_buf(host,
 972                         ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
 973
 974         return iflags;
 975 }
 976
 977 static u32
 978 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 979 {
 980         struct dma_chan                 *chan;
 981         struct dma_async_tx_descriptor  *desc;
 982         struct scatterlist              *sg;
 983         unsigned int                    i;
 984         enum dma_data_direction         direction;
 985         enum dma_transfer_direction     slave_dirn;
 986         unsigned int                    sglen;
 987         u32                             maxburst;
 988         u32 iflags;
 989
 990         data->error = -EINPROGRESS;
 991
 992         WARN_ON(host->data);
 993         host->sg = NULL;
 994         host->data = data;
 995
 996         iflags = ATMCI_DATA_ERROR_FLAGS;
 997
 998         /*
 999          * We don't do DMA on "complex" transfers, i.e. with
1000          * non-word-aligned buffers or lengths. Also, we don't bother
1001          * with all the DMA setup overhead for short transfers.
1002          */
1003         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1004                 return atmci_prepare_data(host, data);
1005         if (data->blksz & 3)
1006                 return atmci_prepare_data(host, data);
1007
1008         for_each_sg(data->sg, sg, data->sg_len, i) {
1009                 if (sg->offset & 3 || sg->length & 3)
1010                         return atmci_prepare_data(host, data);
1011         }
1012
1013         /* If we don't have a channel, we can't do DMA */
1014         chan = host->dma.chan;
1015         if (chan)
1016                 host->data_chan = chan;
1017
1018         if (!chan)
1019                 return -ENODEV;
1020
1021         if (data->flags & MMC_DATA_READ) {
1022                 direction = DMA_FROM_DEVICE;
1023                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1024                 maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
1025         } else {
1026                 direction = DMA_TO_DEVICE;
1027                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1028                 maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
1029         }
1030
1031         if (host->caps.has_dma_conf_reg)
1032                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1033                         ATMCI_DMAEN);
1034
1035         sglen = dma_map_sg(chan->device->dev, data->sg,
1036                         data->sg_len, direction);
1037
1038         dmaengine_slave_config(chan, &host->dma_conf);
1039         desc = dmaengine_prep_slave_sg(chan,
1040                         data->sg, sglen, slave_dirn,
1041                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1042         if (!desc)
1043                 goto unmap_exit;
1044
1045         host->dma.data_desc = desc;
1046         desc->callback = atmci_dma_complete;
1047         desc->callback_param = host;
1048
1049         return iflags;
1050 unmap_exit:
1051         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1052         return -ENOMEM;
1053 }
1054
1055 static void
1056 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1057 {
1058         return;
1059 }
1060
1061 /*
1062  * Start PDC according to transfer direction.
1063  */
1064 static void
1065 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1066 {
1067         if (data->flags & MMC_DATA_READ)
1068                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1069         else
1070                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1071 }
1072
1073 static void
1074 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1075 {
1076         struct dma_chan                 *chan = host->data_chan;
1077         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
1078
1079         if (chan) {
1080                 dmaengine_submit(desc);
1081                 dma_async_issue_pending(chan);
1082         }
1083 }
1084
1085 static void atmci_stop_transfer(struct atmel_mci *host)
1086 {
1087         dev_dbg(&host->pdev->dev,
1088                 "(%s) set pending xfer complete\n", __func__);
1089         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1090         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1091 }
1092
1093 /*
1094  * Stop data transfer because error(s) occurred.
1095  */
1096 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1097 {
1098         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1099 }
1100
1101 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1102 {
1103         struct dma_chan *chan = host->data_chan;
1104
1105         if (chan) {
1106                 dmaengine_terminate_all(chan);
1107                 atmci_dma_cleanup(host);
1108         } else {
1109                 /* Data transfer was stopped by the interrupt handler */
1110                 dev_dbg(&host->pdev->dev,
1111                         "(%s) set pending xfer complete\n", __func__);
1112                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1113                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1114         }
1115 }
1116
1117 /*
1118  * Start a request: prepare data if needed, prepare the command and activate
1119  * interrupts.
1120  */
1121 static void atmci_start_request(struct atmel_mci *host,
1122                 struct atmel_mci_slot *slot)
1123 {
1124         struct mmc_request      *mrq;
1125         struct mmc_command      *cmd;
1126         struct mmc_data         *data;
1127         u32                     iflags;
1128         u32                     cmdflags;
1129
1130         mrq = slot->mrq;
1131         host->cur_slot = slot;
1132         host->mrq = mrq;
1133
1134         host->pending_events = 0;
1135         host->completed_events = 0;
1136         host->cmd_status = 0;
1137         host->data_status = 0;
1138
1139         dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1140
1141         if (host->need_reset || host->caps.need_reset_after_xfer) {
1142                 iflags = atmci_readl(host, ATMCI_IMR);
1143                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1144                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1145                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1146                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1147                 if (host->caps.has_cfg_reg)
1148                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1149                 atmci_writel(host, ATMCI_IER, iflags);
1150                 host->need_reset = false;
1151         }
1152         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1153
1154         iflags = atmci_readl(host, ATMCI_IMR);
1155         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1156                 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1157                                 iflags);
1158
1159         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1160                 /* Send init sequence (74 clock cycles) */
1161                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1162                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1163                         cpu_relax();
1164         }
1165         iflags = 0;
1166         data = mrq->data;
1167         if (data) {
1168                 atmci_set_timeout(host, slot, data);
1169
1170                 /* Must set block count/size before sending command */
1171                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1172                                 | ATMCI_BLKLEN(data->blksz));
1173                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1174                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1175
1176                 iflags |= host->prepare_data(host, data);
1177         }
1178
1179         iflags |= ATMCI_CMDRDY;
1180         cmd = mrq->cmd;
1181         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1182         atmci_send_command(host, cmd, cmdflags);
1183
1184         if (data)
1185                 host->submit_data(host, data);
1186
1187         if (mrq->stop) {
1188                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1189                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1190                 if (!(data->flags & MMC_DATA_WRITE))
1191                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1192                 if (data->flags & MMC_DATA_STREAM)
1193                         host->stop_cmdr |= ATMCI_CMDR_STREAM;
1194                 else
1195                         host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1196         }
1197
1198         /*
1199          * We could have enabled interrupts earlier, but I suspect
1200          * that would open up a nice can of interesting race
1201          * conditions (e.g. command and data complete, but stop not
1202          * prepared yet.)
1203          */
1204         atmci_writel(host, ATMCI_IER, iflags);
1205
1206         mod_timer(&host->timer, jiffies +  msecs_to_jiffies(2000));
1207 }
1208
1209 static void atmci_queue_request(struct atmel_mci *host,
1210                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1211 {
1212         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1213                         host->state);
1214
1215         spin_lock_bh(&host->lock);
1216         slot->mrq = mrq;
1217         if (host->state == STATE_IDLE) {
1218                 host->state = STATE_SENDING_CMD;
1219                 atmci_start_request(host, slot);
1220         } else {
1221                 dev_dbg(&host->pdev->dev, "queue request\n");
1222                 list_add_tail(&slot->queue_node, &host->queue);
1223         }
1224         spin_unlock_bh(&host->lock);
1225 }
1226
1227 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1228 {
1229         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1230         struct atmel_mci        *host = slot->host;
1231         struct mmc_data         *data;
1232
1233         WARN_ON(slot->mrq);
1234         dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1235
1236         /*
1237          * We may "know" the card is gone even though there's still an
1238          * electrical connection. If so, we really need to communicate
1239          * this to the MMC core since there won't be any more
1240          * interrupts as the card is completely removed. Otherwise,
1241          * the MMC core might believe the card is still there even
1242          * though the card was just removed very slowly.
1243          */
1244         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1245                 mrq->cmd->error = -ENOMEDIUM;
1246                 mmc_request_done(mmc, mrq);
1247                 return;
1248         }
1249
1250         /* We don't support multiple blocks of weird lengths. */
1251         data = mrq->data;
1252         if (data && data->blocks > 1 && data->blksz & 3) {
1253                 mrq->cmd->error = -EINVAL;
1254                 mmc_request_done(mmc, mrq);
1255         }
1256
1257         atmci_queue_request(host, slot, mrq);
1258 }
1259
1260 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1261 {
1262         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1263         struct atmel_mci        *host = slot->host;
1264         unsigned int            i;
1265
1266         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1267         switch (ios->bus_width) {
1268         case MMC_BUS_WIDTH_1:
1269                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1270                 break;
1271         case MMC_BUS_WIDTH_4:
1272                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1273                 break;
1274         }
1275
1276         if (ios->clock) {
1277                 unsigned int clock_min = ~0U;
1278                 u32 clkdiv;
1279
1280                 spin_lock_bh(&host->lock);
1281                 if (!host->mode_reg) {
1282                         clk_enable(host->mck);
1283                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1284                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1285                         if (host->caps.has_cfg_reg)
1286                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1287                 }
1288
1289                 /*
1290                  * Use mirror of ios->clock to prevent race with mmc
1291                  * core ios update when finding the minimum.
1292                  */
1293                 slot->clock = ios->clock;
1294                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1295                         if (host->slot[i] && host->slot[i]->clock
1296                                         && host->slot[i]->clock < clock_min)
1297                                 clock_min = host->slot[i]->clock;
1298                 }
1299
1300                 /* Calculate clock divider */
1301                 if (host->caps.has_odd_clk_div) {
1302                         clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1303                         if (clkdiv > 511) {
1304                                 dev_warn(&mmc->class_dev,
1305                                          "clock %u too slow; using %lu\n",
1306                                          clock_min, host->bus_hz / (511 + 2));
1307                                 clkdiv = 511;
1308                         }
1309                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1310                                          | ATMCI_MR_CLKODD(clkdiv & 1);
1311                 } else {
1312                         clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1313                         if (clkdiv > 255) {
1314                                 dev_warn(&mmc->class_dev,
1315                                          "clock %u too slow; using %lu\n",
1316                                          clock_min, host->bus_hz / (2 * 256));
1317                                 clkdiv = 255;
1318                         }
1319                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1320                 }
1321
1322                 /*
1323                  * WRPROOF and RDPROOF prevent overruns/underruns by
1324                  * stopping the clock when the FIFO is full/empty.
1325                  * This state is not expected to last for long.
1326                  */
1327                 if (host->caps.has_rwproof)
1328                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1329
1330                 if (host->caps.has_cfg_reg) {
1331                         /* setup High Speed mode in relation with card capacity */
1332                         if (ios->timing == MMC_TIMING_SD_HS)
1333                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1334                         else
1335                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1336                 }
1337
1338                 if (list_empty(&host->queue)) {
1339                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1340                         if (host->caps.has_cfg_reg)
1341                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1342                 } else {
1343                         host->need_clock_update = true;
1344                 }
1345
1346                 spin_unlock_bh(&host->lock);
1347         } else {
1348                 bool any_slot_active = false;
1349
1350                 spin_lock_bh(&host->lock);
1351                 slot->clock = 0;
1352                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1353                         if (host->slot[i] && host->slot[i]->clock) {
1354                                 any_slot_active = true;
1355                                 break;
1356                         }
1357                 }
1358                 if (!any_slot_active) {
1359                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1360                         if (host->mode_reg) {
1361                                 atmci_readl(host, ATMCI_MR);
1362                                 clk_disable(host->mck);
1363                         }
1364                         host->mode_reg = 0;
1365                 }
1366                 spin_unlock_bh(&host->lock);
1367         }
1368
1369         switch (ios->power_mode) {
1370         case MMC_POWER_UP:
1371                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1372                 break;
1373         default:
1374                 /*
1375                  * TODO: None of the currently available AVR32-based
1376                  * boards allow MMC power to be turned off. Implement
1377                  * power control when this can be tested properly.
1378                  *
1379                  * We also need to hook this into the clock management
1380                  * somehow so that newly inserted cards aren't
1381                  * subjected to a fast clock before we have a chance
1382                  * to figure out what the maximum rate is. Currently,
1383                  * there's no way to avoid this, and there never will
1384                  * be for boards that don't support power control.
1385                  */
1386                 break;
1387         }
1388 }
1389
1390 static int atmci_get_ro(struct mmc_host *mmc)
1391 {
1392         int                     read_only = -ENOSYS;
1393         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1394
1395         if (gpio_is_valid(slot->wp_pin)) {
1396                 read_only = gpio_get_value(slot->wp_pin);
1397                 dev_dbg(&mmc->class_dev, "card is %s\n",
1398                                 read_only ? "read-only" : "read-write");
1399         }
1400
1401         return read_only;
1402 }
1403
1404 static int atmci_get_cd(struct mmc_host *mmc)
1405 {
1406         int                     present = -ENOSYS;
1407         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1408
1409         if (gpio_is_valid(slot->detect_pin)) {
1410                 present = !(gpio_get_value(slot->detect_pin) ^
1411                             slot->detect_is_active_high);
1412                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1413                                 present ? "" : "not ");
1414         }
1415
1416         return present;
1417 }
1418
1419 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1420 {
1421         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1422         struct atmel_mci        *host = slot->host;
1423
1424         if (enable)
1425                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1426         else
1427                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1428 }
1429
1430 static const struct mmc_host_ops atmci_ops = {
1431         .request        = atmci_request,
1432         .set_ios        = atmci_set_ios,
1433         .get_ro         = atmci_get_ro,
1434         .get_cd         = atmci_get_cd,
1435         .enable_sdio_irq = atmci_enable_sdio_irq,
1436 };
1437
1438 /* Called with host->lock held */
1439 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1440         __releases(&host->lock)
1441         __acquires(&host->lock)
1442 {
1443         struct atmel_mci_slot   *slot = NULL;
1444         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1445
1446         WARN_ON(host->cmd || host->data);
1447
1448         /*
1449          * Update the MMC clock rate if necessary. This may be
1450          * necessary if set_ios() is called when a different slot is
1451          * busy transferring data.
1452          */
1453         if (host->need_clock_update) {
1454                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1455                 if (host->caps.has_cfg_reg)
1456                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1457         }
1458
1459         host->cur_slot->mrq = NULL;
1460         host->mrq = NULL;
1461         if (!list_empty(&host->queue)) {
1462                 slot = list_entry(host->queue.next,
1463                                 struct atmel_mci_slot, queue_node);
1464                 list_del(&slot->queue_node);
1465                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1466                                 mmc_hostname(slot->mmc));
1467                 host->state = STATE_SENDING_CMD;
1468                 atmci_start_request(host, slot);
1469         } else {
1470                 dev_vdbg(&host->pdev->dev, "list empty\n");
1471                 host->state = STATE_IDLE;
1472         }
1473
1474         del_timer(&host->timer);
1475
1476         spin_unlock(&host->lock);
1477         mmc_request_done(prev_mmc, mrq);
1478         spin_lock(&host->lock);
1479 }
1480
1481 static void atmci_command_complete(struct atmel_mci *host,
1482                         struct mmc_command *cmd)
1483 {
1484         u32             status = host->cmd_status;
1485
1486         /* Read the response from the card (up to 16 bytes) */
1487         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1488         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1489         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1490         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1491
1492         if (status & ATMCI_RTOE)
1493                 cmd->error = -ETIMEDOUT;
1494         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1495                 cmd->error = -EILSEQ;
1496         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1497                 cmd->error = -EIO;
1498         else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1499                 if (host->caps.need_blksz_mul_4) {
1500                         cmd->error = -EINVAL;
1501                         host->need_reset = 1;
1502                 }
1503         } else
1504                 cmd->error = 0;
1505 }
1506
1507 static void atmci_detect_change(unsigned long data)
1508 {
1509         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1510         bool                    present;
1511         bool                    present_old;
1512
1513         /*
1514          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1515          * freeing the interrupt. We must not re-enable the interrupt
1516          * if it has been freed, and if we're shutting down, it
1517          * doesn't really matter whether the card is present or not.
1518          */
1519         smp_rmb();
1520         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1521                 return;
1522
1523         enable_irq(gpio_to_irq(slot->detect_pin));
1524         present = !(gpio_get_value(slot->detect_pin) ^
1525                     slot->detect_is_active_high);
1526         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1527
1528         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1529                         present, present_old);
1530
1531         if (present != present_old) {
1532                 struct atmel_mci        *host = slot->host;
1533                 struct mmc_request      *mrq;
1534
1535                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1536                         present ? "inserted" : "removed");
1537
1538                 spin_lock(&host->lock);
1539
1540                 if (!present)
1541                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1542                 else
1543                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1544
1545                 /* Clean up queue if present */
1546                 mrq = slot->mrq;
1547                 if (mrq) {
1548                         if (mrq == host->mrq) {
1549                                 /*
1550                                  * Reset controller to terminate any ongoing
1551                                  * commands or data transfers.
1552                                  */
1553                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1554                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1555                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1556                                 if (host->caps.has_cfg_reg)
1557                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1558
1559                                 host->data = NULL;
1560                                 host->cmd = NULL;
1561
1562                                 switch (host->state) {
1563                                 case STATE_IDLE:
1564                                         break;
1565                                 case STATE_SENDING_CMD:
1566                                         mrq->cmd->error = -ENOMEDIUM;
1567                                         if (mrq->data)
1568                                                 host->stop_transfer(host);
1569                                         break;
1570                                 case STATE_DATA_XFER:
1571                                         mrq->data->error = -ENOMEDIUM;
1572                                         host->stop_transfer(host);
1573                                         break;
1574                                 case STATE_WAITING_NOTBUSY:
1575                                         mrq->data->error = -ENOMEDIUM;
1576                                         break;
1577                                 case STATE_SENDING_STOP:
1578                                         mrq->stop->error = -ENOMEDIUM;
1579                                         break;
1580                                 case STATE_END_REQUEST:
1581                                         break;
1582                                 }
1583
1584                                 atmci_request_end(host, mrq);
1585                         } else {
1586                                 list_del(&slot->queue_node);
1587                                 mrq->cmd->error = -ENOMEDIUM;
1588                                 if (mrq->data)
1589                                         mrq->data->error = -ENOMEDIUM;
1590                                 if (mrq->stop)
1591                                         mrq->stop->error = -ENOMEDIUM;
1592
1593                                 spin_unlock(&host->lock);
1594                                 mmc_request_done(slot->mmc, mrq);
1595                                 spin_lock(&host->lock);
1596                         }
1597                 }
1598                 spin_unlock(&host->lock);
1599
1600                 mmc_detect_change(slot->mmc, 0);
1601         }
1602 }
1603
1604 static void atmci_tasklet_func(unsigned long priv)
1605 {
1606         struct atmel_mci        *host = (struct atmel_mci *)priv;
1607         struct mmc_request      *mrq = host->mrq;
1608         struct mmc_data         *data = host->data;
1609         enum atmel_mci_state    state = host->state;
1610         enum atmel_mci_state    prev_state;
1611         u32                     status;
1612
1613         spin_lock(&host->lock);
1614
1615         state = host->state;
1616
1617         dev_vdbg(&host->pdev->dev,
1618                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1619                 state, host->pending_events, host->completed_events,
1620                 atmci_readl(host, ATMCI_IMR));
1621
1622         do {
1623                 prev_state = state;
1624                 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1625
1626                 switch (state) {
1627                 case STATE_IDLE:
1628                         break;
1629
1630                 case STATE_SENDING_CMD:
1631                         /*
1632                          * Command has been sent, we are waiting for command
1633                          * ready. Then we have three next states possible:
1634                          * END_REQUEST by default, WAITING_NOTBUSY if it's a
1635                          * command needing it or DATA_XFER if there is data.
1636                          */
1637                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1638                         if (!atmci_test_and_clear_pending(host,
1639                                                 EVENT_CMD_RDY))
1640                                 break;
1641
1642                         dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1643                         host->cmd = NULL;
1644                         atmci_set_completed(host, EVENT_CMD_RDY);
1645                         atmci_command_complete(host, mrq->cmd);
1646                         if (mrq->data) {
1647                                 dev_dbg(&host->pdev->dev,
1648                                         "command with data transfer");
1649                                 /*
1650                                  * If there is a command error don't start
1651                                  * data transfer.
1652                                  */
1653                                 if (mrq->cmd->error) {
1654                                         host->stop_transfer(host);
1655                                         host->data = NULL;
1656                                         atmci_writel(host, ATMCI_IDR,
1657                                                      ATMCI_TXRDY | ATMCI_RXRDY
1658                                                      | ATMCI_DATA_ERROR_FLAGS);
1659                                         state = STATE_END_REQUEST;
1660                                 } else
1661                                         state = STATE_DATA_XFER;
1662                         } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1663                                 dev_dbg(&host->pdev->dev,
1664                                         "command response need waiting notbusy");
1665                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1666                                 state = STATE_WAITING_NOTBUSY;
1667                         } else
1668                                 state = STATE_END_REQUEST;
1669
1670                         break;
1671
1672                 case STATE_DATA_XFER:
1673                         if (atmci_test_and_clear_pending(host,
1674                                                 EVENT_DATA_ERROR)) {
1675                                 dev_dbg(&host->pdev->dev, "set completed data error\n");
1676                                 atmci_set_completed(host, EVENT_DATA_ERROR);
1677                                 state = STATE_END_REQUEST;
1678                                 break;
1679                         }
1680
1681                         /*
1682                          * A data transfer is in progress. The event expected
1683                          * to move to the next state depends of data transfer
1684                          * type (PDC or DMA). Once transfer done we can move
1685                          * to the next step which is WAITING_NOTBUSY in write
1686                          * case and directly SENDING_STOP in read case.
1687                          */
1688                         dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1689                         if (!atmci_test_and_clear_pending(host,
1690                                                 EVENT_XFER_COMPLETE))
1691                                 break;
1692
1693                         dev_dbg(&host->pdev->dev,
1694                                 "(%s) set completed xfer complete\n",
1695                                 __func__);
1696                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1697
1698                         if (host->caps.need_notbusy_for_read_ops ||
1699                            (host->data->flags & MMC_DATA_WRITE)) {
1700                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1701                                 state = STATE_WAITING_NOTBUSY;
1702                         } else if (host->mrq->stop) {
1703                                 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1704                                 atmci_send_stop_cmd(host, data);
1705                                 state = STATE_SENDING_STOP;
1706                         } else {
1707                                 host->data = NULL;
1708                                 data->bytes_xfered = data->blocks * data->blksz;
1709                                 data->error = 0;
1710                                 state = STATE_END_REQUEST;
1711                         }
1712                         break;
1713
1714                 case STATE_WAITING_NOTBUSY:
1715                         /*
1716                          * We can be in the state for two reasons: a command
1717                          * requiring waiting not busy signal (stop command
1718                          * included) or a write operation. In the latest case,
1719                          * we need to send a stop command.
1720                          */
1721                         dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1722                         if (!atmci_test_and_clear_pending(host,
1723                                                 EVENT_NOTBUSY))
1724                                 break;
1725
1726                         dev_dbg(&host->pdev->dev, "set completed not busy\n");
1727                         atmci_set_completed(host, EVENT_NOTBUSY);
1728
1729                         if (host->data) {
1730                                 /*
1731                                  * For some commands such as CMD53, even if
1732                                  * there is data transfer, there is no stop
1733                                  * command to send.
1734                                  */
1735                                 if (host->mrq->stop) {
1736                                         atmci_writel(host, ATMCI_IER,
1737                                                      ATMCI_CMDRDY);
1738                                         atmci_send_stop_cmd(host, data);
1739                                         state = STATE_SENDING_STOP;
1740                                 } else {
1741                                         host->data = NULL;
1742                                         data->bytes_xfered = data->blocks
1743                                                              * data->blksz;
1744                                         data->error = 0;
1745                                         state = STATE_END_REQUEST;
1746                                 }
1747                         } else
1748                                 state = STATE_END_REQUEST;
1749                         break;
1750
1751                 case STATE_SENDING_STOP:
1752                         /*
1753                          * In this state, it is important to set host->data to
1754                          * NULL (which is tested in the waiting notbusy state)
1755                          * in order to go to the end request state instead of
1756                          * sending stop again.
1757                          */
1758                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1759                         if (!atmci_test_and_clear_pending(host,
1760                                                 EVENT_CMD_RDY))
1761                                 break;
1762
1763                         dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1764                         host->cmd = NULL;
1765                         data->bytes_xfered = data->blocks * data->blksz;
1766                         data->error = 0;
1767                         atmci_command_complete(host, mrq->stop);
1768                         if (mrq->stop->error) {
1769                                 host->stop_transfer(host);
1770                                 atmci_writel(host, ATMCI_IDR,
1771                                              ATMCI_TXRDY | ATMCI_RXRDY
1772                                              | ATMCI_DATA_ERROR_FLAGS);
1773                                 state = STATE_END_REQUEST;
1774                         } else {
1775                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1776                                 state = STATE_WAITING_NOTBUSY;
1777                         }
1778                         host->data = NULL;
1779                         break;
1780
1781                 case STATE_END_REQUEST:
1782                         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1783                                            | ATMCI_DATA_ERROR_FLAGS);
1784                         status = host->data_status;
1785                         if (unlikely(status)) {
1786                                 host->stop_transfer(host);
1787                                 host->data = NULL;
1788                                 if (status & ATMCI_DTOE) {
1789                                         data->error = -ETIMEDOUT;
1790                                 } else if (status & ATMCI_DCRCE) {
1791                                         data->error = -EILSEQ;
1792                                 } else {
1793                                         data->error = -EIO;
1794                                 }
1795                         }
1796
1797                         atmci_request_end(host, host->mrq);
1798                         state = STATE_IDLE;
1799                         break;
1800                 }
1801         } while (state != prev_state);
1802
1803         host->state = state;
1804
1805         spin_unlock(&host->lock);
1806 }
1807
1808 static void atmci_read_data_pio(struct atmel_mci *host)
1809 {
1810         struct scatterlist      *sg = host->sg;
1811         void                    *buf = sg_virt(sg);
1812         unsigned int            offset = host->pio_offset;
1813         struct mmc_data         *data = host->data;
1814         u32                     value;
1815         u32                     status;
1816         unsigned int            nbytes = 0;
1817
1818         do {
1819                 value = atmci_readl(host, ATMCI_RDR);
1820                 if (likely(offset + 4 <= sg->length)) {
1821                         put_unaligned(value, (u32 *)(buf + offset));
1822
1823                         offset += 4;
1824                         nbytes += 4;
1825
1826                         if (offset == sg->length) {
1827                                 flush_dcache_page(sg_page(sg));
1828                                 host->sg = sg = sg_next(sg);
1829                                 if (!sg)
1830                                         goto done;
1831
1832                                 offset = 0;
1833                                 buf = sg_virt(sg);
1834                         }
1835                 } else {
1836                         unsigned int remaining = sg->length - offset;
1837                         memcpy(buf + offset, &value, remaining);
1838                         nbytes += remaining;
1839
1840                         flush_dcache_page(sg_page(sg));
1841                         host->sg = sg = sg_next(sg);
1842                         if (!sg)
1843                                 goto done;
1844
1845                         offset = 4 - remaining;
1846                         buf = sg_virt(sg);
1847                         memcpy(buf, (u8 *)&value + remaining, offset);
1848                         nbytes += offset;
1849                 }
1850
1851                 status = atmci_readl(host, ATMCI_SR);
1852                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1853                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1854                                                 | ATMCI_DATA_ERROR_FLAGS));
1855                         host->data_status = status;
1856                         data->bytes_xfered += nbytes;
1857                         return;
1858                 }
1859         } while (status & ATMCI_RXRDY);
1860
1861         host->pio_offset = offset;
1862         data->bytes_xfered += nbytes;
1863
1864         return;
1865
1866 done:
1867         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1868         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1869         data->bytes_xfered += nbytes;
1870         smp_wmb();
1871         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1872 }
1873
1874 static void atmci_write_data_pio(struct atmel_mci *host)
1875 {
1876         struct scatterlist      *sg = host->sg;
1877         void                    *buf = sg_virt(sg);
1878         unsigned int            offset = host->pio_offset;
1879         struct mmc_data         *data = host->data;
1880         u32                     value;
1881         u32                     status;
1882         unsigned int            nbytes = 0;
1883
1884         do {
1885                 if (likely(offset + 4 <= sg->length)) {
1886                         value = get_unaligned((u32 *)(buf + offset));
1887                         atmci_writel(host, ATMCI_TDR, value);
1888
1889                         offset += 4;
1890                         nbytes += 4;
1891                         if (offset == sg->length) {
1892                                 host->sg = sg = sg_next(sg);
1893                                 if (!sg)
1894                                         goto done;
1895
1896                                 offset = 0;
1897                                 buf = sg_virt(sg);
1898                         }
1899                 } else {
1900                         unsigned int remaining = sg->length - offset;
1901
1902                         value = 0;
1903                         memcpy(&value, buf + offset, remaining);
1904                         nbytes += remaining;
1905
1906                         host->sg = sg = sg_next(sg);
1907                         if (!sg) {
1908                                 atmci_writel(host, ATMCI_TDR, value);
1909                                 goto done;
1910                         }
1911
1912                         offset = 4 - remaining;
1913                         buf = sg_virt(sg);
1914                         memcpy((u8 *)&value + remaining, buf, offset);
1915                         atmci_writel(host, ATMCI_TDR, value);
1916                         nbytes += offset;
1917                 }
1918
1919                 status = atmci_readl(host, ATMCI_SR);
1920                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1921                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1922                                                 | ATMCI_DATA_ERROR_FLAGS));
1923                         host->data_status = status;
1924                         data->bytes_xfered += nbytes;
1925                         return;
1926                 }
1927         } while (status & ATMCI_TXRDY);
1928
1929         host->pio_offset = offset;
1930         data->bytes_xfered += nbytes;
1931
1932         return;
1933
1934 done:
1935         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1936         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1937         data->bytes_xfered += nbytes;
1938         smp_wmb();
1939         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1940 }
1941
1942 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1943 {
1944         int     i;
1945
1946         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1947                 struct atmel_mci_slot *slot = host->slot[i];
1948                 if (slot && (status & slot->sdio_irq)) {
1949                         mmc_signal_sdio_irq(slot->mmc);
1950                 }
1951         }
1952 }
1953
1954
1955 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1956 {
1957         struct atmel_mci        *host = dev_id;
1958         u32                     status, mask, pending;
1959         unsigned int            pass_count = 0;
1960
1961         do {
1962                 status = atmci_readl(host, ATMCI_SR);
1963                 mask = atmci_readl(host, ATMCI_IMR);
1964                 pending = status & mask;
1965                 if (!pending)
1966                         break;
1967
1968                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
1969                         dev_dbg(&host->pdev->dev, "IRQ: data error\n");
1970                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
1971                                         | ATMCI_RXRDY | ATMCI_TXRDY
1972                                         | ATMCI_ENDRX | ATMCI_ENDTX
1973                                         | ATMCI_RXBUFF | ATMCI_TXBUFE);
1974
1975                         host->data_status = status;
1976                         dev_dbg(&host->pdev->dev, "set pending data error\n");
1977                         smp_wmb();
1978                         atmci_set_pending(host, EVENT_DATA_ERROR);
1979                         tasklet_schedule(&host->tasklet);
1980                 }
1981
1982                 if (pending & ATMCI_TXBUFE) {
1983                         dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
1984                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
1985                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
1986                         /*
1987                          * We can receive this interruption before having configured
1988                          * the second pdc buffer, so we need to reconfigure first and
1989                          * second buffers again
1990                          */
1991                         if (host->data_size) {
1992                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
1993                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
1994                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
1995                         } else {
1996                                 atmci_pdc_complete(host);
1997                         }
1998                 } else if (pending & ATMCI_ENDTX) {
1999                         dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2000                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2001
2002                         if (host->data_size) {
2003                                 atmci_pdc_set_single_buf(host,
2004                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
2005                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2006                         }
2007                 }
2008
2009                 if (pending & ATMCI_RXBUFF) {
2010                         dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2011                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2012                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2013                         /*
2014                          * We can receive this interruption before having configured
2015                          * the second pdc buffer, so we need to reconfigure first and
2016                          * second buffers again
2017                          */
2018                         if (host->data_size) {
2019                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2020                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2021                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2022                         } else {
2023                                 atmci_pdc_complete(host);
2024                         }
2025                 } else if (pending & ATMCI_ENDRX) {
2026                         dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2027                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2028
2029                         if (host->data_size) {
2030                                 atmci_pdc_set_single_buf(host,
2031                                                 XFER_RECEIVE, PDC_SECOND_BUF);
2032                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2033                         }
2034                 }
2035
2036                 /*
2037                  * First mci IPs, so mainly the ones having pdc, have some
2038                  * issues with the notbusy signal. You can't get it after
2039                  * data transmission if you have not sent a stop command.
2040                  * The appropriate workaround is to use the BLKE signal.
2041                  */
2042                 if (pending & ATMCI_BLKE) {
2043                         dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2044                         atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2045                         smp_wmb();
2046                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2047                         atmci_set_pending(host, EVENT_NOTBUSY);
2048                         tasklet_schedule(&host->tasklet);
2049                 }
2050
2051                 if (pending & ATMCI_NOTBUSY) {
2052                         dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2053                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2054                         smp_wmb();
2055                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2056                         atmci_set_pending(host, EVENT_NOTBUSY);
2057                         tasklet_schedule(&host->tasklet);
2058                 }
2059
2060                 if (pending & ATMCI_RXRDY)
2061                         atmci_read_data_pio(host);
2062                 if (pending & ATMCI_TXRDY)
2063                         atmci_write_data_pio(host);
2064
2065                 if (pending & ATMCI_CMDRDY) {
2066                         dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2067                         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2068                         host->cmd_status = status;
2069                         smp_wmb();
2070                         dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2071                         atmci_set_pending(host, EVENT_CMD_RDY);
2072                         tasklet_schedule(&host->tasklet);
2073                 }
2074
2075                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2076                         atmci_sdio_interrupt(host, status);
2077
2078         } while (pass_count++ < 5);
2079
2080         return pass_count ? IRQ_HANDLED : IRQ_NONE;
2081 }
2082
2083 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2084 {
2085         struct atmel_mci_slot   *slot = dev_id;
2086
2087         /*
2088          * Disable interrupts until the pin has stabilized and check
2089          * the state then. Use mod_timer() since we may be in the
2090          * middle of the timer routine when this interrupt triggers.
2091          */
2092         disable_irq_nosync(irq);
2093         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2094
2095         return IRQ_HANDLED;
2096 }
2097
2098 static int __init atmci_init_slot(struct atmel_mci *host,
2099                 struct mci_slot_pdata *slot_data, unsigned int id,
2100                 u32 sdc_reg, u32 sdio_irq)
2101 {
2102         struct mmc_host                 *mmc;
2103         struct atmel_mci_slot           *slot;
2104
2105         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2106         if (!mmc)
2107                 return -ENOMEM;
2108
2109         slot = mmc_priv(mmc);
2110         slot->mmc = mmc;
2111         slot->host = host;
2112         slot->detect_pin = slot_data->detect_pin;
2113         slot->wp_pin = slot_data->wp_pin;
2114         slot->detect_is_active_high = slot_data->detect_is_active_high;
2115         slot->sdc_reg = sdc_reg;
2116         slot->sdio_irq = sdio_irq;
2117
2118         dev_dbg(&mmc->class_dev,
2119                 "slot[%u]: bus_width=%u, detect_pin=%d, "
2120                 "detect_is_active_high=%s, wp_pin=%d\n",
2121                 id, slot_data->bus_width, slot_data->detect_pin,
2122                 slot_data->detect_is_active_high ? "true" : "false",
2123                 slot_data->wp_pin);
2124
2125         mmc->ops = &atmci_ops;
2126         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2127         mmc->f_max = host->bus_hz / 2;
2128         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
2129         if (sdio_irq)
2130                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2131         if (host->caps.has_highspeed)
2132                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2133         /*
2134          * Without the read/write proof capability, it is strongly suggested to
2135          * use only one bit for data to prevent fifo underruns and overruns
2136          * which will corrupt data.
2137          */
2138         if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2139                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2140
2141         if (atmci_get_version(host) < 0x200) {
2142                 mmc->max_segs = 256;
2143                 mmc->max_blk_size = 4095;
2144                 mmc->max_blk_count = 256;
2145                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2146                 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2147         } else {
2148                 mmc->max_segs = 64;
2149                 mmc->max_req_size = 32768 * 512;
2150                 mmc->max_blk_size = 32768;
2151                 mmc->max_blk_count = 512;
2152         }
2153
2154         /* Assume card is present initially */
2155         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2156         if (gpio_is_valid(slot->detect_pin)) {
2157                 if (gpio_request(slot->detect_pin, "mmc_detect")) {
2158                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
2159                         slot->detect_pin = -EBUSY;
2160                 } else if (gpio_get_value(slot->detect_pin) ^
2161                                 slot->detect_is_active_high) {
2162                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2163                 }
2164         }
2165
2166         if (!gpio_is_valid(slot->detect_pin))
2167                 mmc->caps |= MMC_CAP_NEEDS_POLL;
2168
2169         if (gpio_is_valid(slot->wp_pin)) {
2170                 if (gpio_request(slot->wp_pin, "mmc_wp")) {
2171                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
2172                         slot->wp_pin = -EBUSY;
2173                 }
2174         }
2175
2176         host->slot[id] = slot;
2177         mmc_add_host(mmc);
2178
2179         if (gpio_is_valid(slot->detect_pin)) {
2180                 int ret;
2181
2182                 setup_timer(&slot->detect_timer, atmci_detect_change,
2183                                 (unsigned long)slot);
2184
2185                 ret = request_irq(gpio_to_irq(slot->detect_pin),
2186                                 atmci_detect_interrupt,
2187                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2188                                 "mmc-detect", slot);
2189                 if (ret) {
2190                         dev_dbg(&mmc->class_dev,
2191                                 "could not request IRQ %d for detect pin\n",
2192                                 gpio_to_irq(slot->detect_pin));
2193                         gpio_free(slot->detect_pin);
2194                         slot->detect_pin = -EBUSY;
2195                 }
2196         }
2197
2198         atmci_init_debugfs(slot);
2199
2200         return 0;
2201 }
2202
2203 static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
2204                 unsigned int id)
2205 {
2206         /* Debugfs stuff is cleaned up by mmc core */
2207
2208         set_bit(ATMCI_SHUTDOWN, &slot->flags);
2209         smp_wmb();
2210
2211         mmc_remove_host(slot->mmc);
2212
2213         if (gpio_is_valid(slot->detect_pin)) {
2214                 int pin = slot->detect_pin;
2215
2216                 free_irq(gpio_to_irq(pin), slot);
2217                 del_timer_sync(&slot->detect_timer);
2218                 gpio_free(pin);
2219         }
2220         if (gpio_is_valid(slot->wp_pin))
2221                 gpio_free(slot->wp_pin);
2222
2223         slot->host->slot[id] = NULL;
2224         mmc_free_host(slot->mmc);
2225 }
2226
2227 static bool atmci_filter(struct dma_chan *chan, void *slave)
2228 {
2229         struct mci_dma_data     *sl = slave;
2230
2231         if (sl && find_slave_dev(sl) == chan->device->dev) {
2232                 chan->private = slave_data_ptr(sl);
2233                 return true;
2234         } else {
2235                 return false;
2236         }
2237 }
2238
2239 static bool atmci_configure_dma(struct atmel_mci *host)
2240 {
2241         struct mci_platform_data        *pdata;
2242
2243         if (host == NULL)
2244                 return false;
2245
2246         pdata = host->pdev->dev.platform_data;
2247
2248         if (!pdata)
2249                 return false;
2250
2251         if (pdata->dma_slave && find_slave_dev(pdata->dma_slave)) {
2252                 dma_cap_mask_t mask;
2253
2254                 /* Try to grab a DMA channel */
2255                 dma_cap_zero(mask);
2256                 dma_cap_set(DMA_SLAVE, mask);
2257                 host->dma.chan =
2258                         dma_request_channel(mask, atmci_filter, pdata->dma_slave);
2259         }
2260         if (!host->dma.chan) {
2261                 dev_warn(&host->pdev->dev, "no DMA channel available\n");
2262                 return false;
2263         } else {
2264                 dev_info(&host->pdev->dev,
2265                                         "using %s for DMA transfers\n",
2266                                         dma_chan_name(host->dma.chan));
2267
2268                 host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2269                 host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2270                 host->dma_conf.src_maxburst = 1;
2271                 host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2272                 host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2273                 host->dma_conf.dst_maxburst = 1;
2274                 host->dma_conf.device_fc = false;
2275                 return true;
2276         }
2277 }
2278
2279 /*
2280  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2281  * HSMCI provides DMA support and a new config register but no more supports
2282  * PDC.
2283  */
2284 static void __init atmci_get_cap(struct atmel_mci *host)
2285 {
2286         unsigned int version;
2287
2288         version = atmci_get_version(host);
2289         dev_info(&host->pdev->dev,
2290                         "version: 0x%x\n", version);
2291
2292         host->caps.has_dma_conf_reg = 0;
2293         host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2294         host->caps.has_cfg_reg = 0;
2295         host->caps.has_cstor_reg = 0;
2296         host->caps.has_highspeed = 0;
2297         host->caps.has_rwproof = 0;
2298         host->caps.has_odd_clk_div = 0;
2299         host->caps.has_bad_data_ordering = 1;
2300         host->caps.need_reset_after_xfer = 1;
2301         host->caps.need_blksz_mul_4 = 1;
2302         host->caps.need_notbusy_for_read_ops = 0;
2303
2304         /* keep only major version number */
2305         switch (version & 0xf00) {
2306         case 0x500:
2307                 host->caps.has_odd_clk_div = 1;
2308         case 0x400:
2309         case 0x300:
2310                 host->caps.has_dma_conf_reg = 1;
2311                 host->caps.has_pdc = 0;
2312                 host->caps.has_cfg_reg = 1;
2313                 host->caps.has_cstor_reg = 1;
2314                 host->caps.has_highspeed = 1;
2315         case 0x200:
2316                 host->caps.has_rwproof = 1;
2317                 host->caps.need_blksz_mul_4 = 0;
2318                 host->caps.need_notbusy_for_read_ops = 1;
2319         case 0x100:
2320                 host->caps.has_bad_data_ordering = 0;
2321                 host->caps.need_reset_after_xfer = 0;
2322         case 0x0:
2323                 break;
2324         default:
2325                 host->caps.has_pdc = 0;
2326                 dev_warn(&host->pdev->dev,
2327                                 "Unmanaged mci version, set minimum capabilities\n");
2328                 break;
2329         }
2330 }
2331
2332 static int __init atmci_probe(struct platform_device *pdev)
2333 {
2334         struct mci_platform_data        *pdata;
2335         struct atmel_mci                *host;
2336         struct resource                 *regs;
2337         unsigned int                    nr_slots;
2338         int                             irq;
2339         int                             ret;
2340
2341         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2342         if (!regs)
2343                 return -ENXIO;
2344         pdata = pdev->dev.platform_data;
2345         if (!pdata) {
2346                 pdata = atmci_of_init(pdev);
2347                 if (IS_ERR(pdata)) {
2348                         dev_err(&pdev->dev, "platform data not available\n");
2349                         return PTR_ERR(pdata);
2350                 }
2351         }
2352
2353         irq = platform_get_irq(pdev, 0);
2354         if (irq < 0)
2355                 return irq;
2356
2357         host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
2358         if (!host)
2359                 return -ENOMEM;
2360
2361         host->pdev = pdev;
2362         spin_lock_init(&host->lock);
2363         INIT_LIST_HEAD(&host->queue);
2364
2365         host->mck = clk_get(&pdev->dev, "mci_clk");
2366         if (IS_ERR(host->mck)) {
2367                 ret = PTR_ERR(host->mck);
2368                 goto err_clk_get;
2369         }
2370
2371         ret = -ENOMEM;
2372         host->regs = ioremap(regs->start, resource_size(regs));
2373         if (!host->regs)
2374                 goto err_ioremap;
2375
2376         clk_enable(host->mck);
2377         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2378         host->bus_hz = clk_get_rate(host->mck);
2379         clk_disable(host->mck);
2380
2381         host->mapbase = regs->start;
2382
2383         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2384
2385         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2386         if (ret)
2387                 goto err_request_irq;
2388
2389         /* Get MCI capabilities and set operations according to it */
2390         atmci_get_cap(host);
2391         if (atmci_configure_dma(host)) {
2392                 host->prepare_data = &atmci_prepare_data_dma;
2393                 host->submit_data = &atmci_submit_data_dma;
2394                 host->stop_transfer = &atmci_stop_transfer_dma;
2395         } else if (host->caps.has_pdc) {
2396                 dev_info(&pdev->dev, "using PDC\n");
2397                 host->prepare_data = &atmci_prepare_data_pdc;
2398                 host->submit_data = &atmci_submit_data_pdc;
2399                 host->stop_transfer = &atmci_stop_transfer_pdc;
2400         } else {
2401                 dev_info(&pdev->dev, "using PIO\n");
2402                 host->prepare_data = &atmci_prepare_data;
2403                 host->submit_data = &atmci_submit_data;
2404                 host->stop_transfer = &atmci_stop_transfer;
2405         }
2406
2407         platform_set_drvdata(pdev, host);
2408
2409         setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2410
2411         /* We need at least one slot to succeed */
2412         nr_slots = 0;
2413         ret = -ENODEV;
2414         if (pdata->slot[0].bus_width) {
2415                 ret = atmci_init_slot(host, &pdata->slot[0],
2416                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2417                 if (!ret) {
2418                         nr_slots++;
2419                         host->buf_size = host->slot[0]->mmc->max_req_size;
2420                 }
2421         }
2422         if (pdata->slot[1].bus_width) {
2423                 ret = atmci_init_slot(host, &pdata->slot[1],
2424                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2425                 if (!ret) {
2426                         nr_slots++;
2427                         if (host->slot[1]->mmc->max_req_size > host->buf_size)
2428                                 host->buf_size =
2429                                         host->slot[1]->mmc->max_req_size;
2430                 }
2431         }
2432
2433         if (!nr_slots) {
2434                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2435                 goto err_init_slot;
2436         }
2437
2438         if (!host->caps.has_rwproof) {
2439                 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2440                                                   &host->buf_phys_addr,
2441                                                   GFP_KERNEL);
2442                 if (!host->buffer) {
2443                         ret = -ENOMEM;
2444                         dev_err(&pdev->dev, "buffer allocation failed\n");
2445                         goto err_init_slot;
2446                 }
2447         }
2448
2449         dev_info(&pdev->dev,
2450                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2451                         host->mapbase, irq, nr_slots);
2452
2453         return 0;
2454
2455 err_init_slot:
2456         if (host->dma.chan)
2457                 dma_release_channel(host->dma.chan);
2458         free_irq(irq, host);
2459 err_request_irq:
2460         iounmap(host->regs);
2461 err_ioremap:
2462         clk_put(host->mck);
2463 err_clk_get:
2464         kfree(host);
2465         return ret;
2466 }
2467
2468 static int __exit atmci_remove(struct platform_device *pdev)
2469 {
2470         struct atmel_mci        *host = platform_get_drvdata(pdev);
2471         unsigned int            i;
2472
2473         platform_set_drvdata(pdev, NULL);
2474
2475         if (host->buffer)
2476                 dma_free_coherent(&pdev->dev, host->buf_size,
2477                                   host->buffer, host->buf_phys_addr);
2478
2479         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2480                 if (host->slot[i])
2481                         atmci_cleanup_slot(host->slot[i], i);
2482         }
2483
2484         clk_enable(host->mck);
2485         atmci_writel(host, ATMCI_IDR, ~0UL);
2486         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2487         atmci_readl(host, ATMCI_SR);
2488         clk_disable(host->mck);
2489
2490 #ifdef CONFIG_MMC_ATMELMCI_DMA
2491         if (host->dma.chan)
2492                 dma_release_channel(host->dma.chan);
2493 #endif
2494
2495         free_irq(platform_get_irq(pdev, 0), host);
2496         iounmap(host->regs);
2497
2498         clk_put(host->mck);
2499         kfree(host);
2500
2501         return 0;
2502 }
2503
2504 #ifdef CONFIG_PM
2505 static int atmci_suspend(struct device *dev)
2506 {
2507         struct atmel_mci *host = dev_get_drvdata(dev);
2508         int i;
2509
2510          for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2511                 struct atmel_mci_slot *slot = host->slot[i];
2512                 int ret;
2513
2514                 if (!slot)
2515                         continue;
2516                 ret = mmc_suspend_host(slot->mmc);
2517                 if (ret < 0) {
2518                         while (--i >= 0) {
2519                                 slot = host->slot[i];
2520                                 if (slot
2521                                 && test_bit(ATMCI_SUSPENDED, &slot->flags)) {
2522                                         mmc_resume_host(host->slot[i]->mmc);
2523                                         clear_bit(ATMCI_SUSPENDED, &slot->flags);
2524                                 }
2525                         }
2526                         return ret;
2527                 } else {
2528                         set_bit(ATMCI_SUSPENDED, &slot->flags);
2529                 }
2530         }
2531
2532         return 0;
2533 }
2534
2535 static int atmci_resume(struct device *dev)
2536 {
2537         struct atmel_mci *host = dev_get_drvdata(dev);
2538         int i;
2539         int ret = 0;
2540
2541         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2542                 struct atmel_mci_slot *slot = host->slot[i];
2543                 int err;
2544
2545                 slot = host->slot[i];
2546                 if (!slot)
2547                         continue;
2548                 if (!test_bit(ATMCI_SUSPENDED, &slot->flags))
2549                         continue;
2550                 err = mmc_resume_host(slot->mmc);
2551                 if (err < 0)
2552                         ret = err;
2553                 else
2554                         clear_bit(ATMCI_SUSPENDED, &slot->flags);
2555         }
2556
2557         return ret;
2558 }
2559 static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume);
2560 #define ATMCI_PM_OPS    (&atmci_pm)
2561 #else
2562 #define ATMCI_PM_OPS    NULL
2563 #endif
2564
2565 static struct platform_driver atmci_driver = {
2566         .remove         = __exit_p(atmci_remove),
2567         .driver         = {
2568                 .name           = "atmel_mci",
2569                 .pm             = ATMCI_PM_OPS,
2570                 .of_match_table = of_match_ptr(atmci_dt_ids),
2571         },
2572 };
2573
2574 static int __init atmci_init(void)
2575 {
2576         return platform_driver_probe(&atmci_driver, atmci_probe);
2577 }
2578
2579 static void __exit atmci_exit(void)
2580 {
2581         platform_driver_unregister(&atmci_driver);
2582 }
2583
2584 late_initcall(atmci_init); /* try to load after dma driver when built-in */
2585 module_exit(atmci_exit);
2586
2587 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2588 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2589 MODULE_LICENSE("GPL v2");