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/platform_device.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/slab.h>
  26 #include <linux/stat.h>
  27
  28 #include <linux/mmc/host.h>
  29 #include <linux/mmc/sdio.h>
  30
  31 #include <mach/atmel-mci.h>
  32 #include <linux/atmel-mci.h>
  33
  34 #include <asm/io.h>
  35 #include <asm/unaligned.h>
  36
  37 #include <mach/cpu.h>
  38 #include <mach/board.h>
  39
  40 #include "atmel-mci-regs.h"
  41
  42 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
  43 #define ATMCI_DMA_THRESHOLD     16
  44
  45 enum {
  46         EVENT_CMD_COMPLETE = 0,
  47         EVENT_XFER_COMPLETE,
  48         EVENT_DATA_COMPLETE,
  49         EVENT_DATA_ERROR,
  50 };
  51
  52 enum atmel_mci_state {
  53         STATE_IDLE = 0,
  54         STATE_SENDING_CMD,
  55         STATE_SENDING_DATA,
  56         STATE_DATA_BUSY,
  57         STATE_SENDING_STOP,
  58         STATE_DATA_ERROR,
  59 };
  60
  61 struct atmel_mci_dma {
  62 #ifdef CONFIG_MMC_ATMELMCI_DMA
  63         struct dma_chan                 *chan;
  64         struct dma_async_tx_descriptor  *data_desc;
  65 #endif
  66 };
  67
  68 /**
  69  * struct atmel_mci - MMC controller state shared between all slots
  70  * @lock: Spinlock protecting the queue and associated data.
  71  * @regs: Pointer to MMIO registers.
  72  * @sg: Scatterlist entry currently being processed by PIO code, if any.
  73  * @pio_offset: Offset into the current scatterlist entry.
  74  * @cur_slot: The slot which is currently using the controller.
  75  * @mrq: The request currently being processed on @cur_slot,
  76  *      or NULL if the controller is idle.
  77  * @cmd: The command currently being sent to the card, or NULL.
  78  * @data: The data currently being transferred, or NULL if no data
  79  *      transfer is in progress.
  80  * @dma: DMA client state.
  81  * @data_chan: DMA channel being used for the current data transfer.
  82  * @cmd_status: Snapshot of SR taken upon completion of the current
  83  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
  84  * @data_status: Snapshot of SR taken upon completion of the current
  85  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
  86  *      EVENT_DATA_ERROR is pending.
  87  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
  88  *      to be sent.
  89  * @tasklet: Tasklet running the request state machine.
  90  * @pending_events: Bitmask of events flagged by the interrupt handler
  91  *      to be processed by the tasklet.
  92  * @completed_events: Bitmask of events which the state machine has
  93  *      processed.
  94  * @state: Tasklet state.
  95  * @queue: List of slots waiting for access to the controller.
  96  * @need_clock_update: Update the clock rate before the next request.
  97  * @need_reset: Reset controller before next request.
  98  * @mode_reg: Value of the MR register.
  99  * @cfg_reg: Value of the CFG register.
 100  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
 101  *      rate and timeout calculations.
 102  * @mapbase: Physical address of the MMIO registers.
 103  * @mck: The peripheral bus clock hooked up to the MMC controller.
 104  * @pdev: Platform device associated with the MMC controller.
 105  * @slot: Slots sharing this MMC controller.
 106  *
 107  * Locking
 108  * =======
 109  *
 110  * @lock is a softirq-safe spinlock protecting @queue as well as
 111  * @cur_slot, @mrq and @state. These must always be updated
 112  * at the same time while holding @lock.
 113  *
 114  * @lock also protects mode_reg and need_clock_update since these are
 115  * used to synchronize mode register updates with the queue
 116  * processing.
 117  *
 118  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
 119  * and must always be written at the same time as the slot is added to
 120  * @queue.
 121  *
 122  * @pending_events and @completed_events are accessed using atomic bit
 123  * operations, so they don't need any locking.
 124  *
 125  * None of the fields touched by the interrupt handler need any
 126  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 127  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 128  * interrupts must be disabled and @data_status updated with a
 129  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 130  * CMDRDY interrupt must be disabled and @cmd_status updated with a
 131  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 132  * bytes_xfered field of @data must be written. This is ensured by
 133  * using barriers.
 134  */
 135 struct atmel_mci {
 136         spinlock_t              lock;
 137         void __iomem            *regs;
 138
 139         struct scatterlist      *sg;
 140         unsigned int            pio_offset;
 141
 142         struct atmel_mci_slot   *cur_slot;
 143         struct mmc_request      *mrq;
 144         struct mmc_command      *cmd;
 145         struct mmc_data         *data;
 146
 147         struct atmel_mci_dma    dma;
 148         struct dma_chan         *data_chan;
 149
 150         u32                     cmd_status;
 151         u32                     data_status;
 152         u32                     stop_cmdr;
 153
 154         struct tasklet_struct   tasklet;
 155         unsigned long           pending_events;
 156         unsigned long           completed_events;
 157         enum atmel_mci_state    state;
 158         struct list_head        queue;
 159
 160         bool                    need_clock_update;
 161         bool                    need_reset;
 162         u32                     mode_reg;
 163         u32                     cfg_reg;
 164         unsigned long           bus_hz;
 165         unsigned long           mapbase;
 166         struct clk              *mck;
 167         struct platform_device  *pdev;
 168
 169         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
 170 };
 171
 172 /**
 173  * struct atmel_mci_slot - MMC slot state
 174  * @mmc: The mmc_host representing this slot.
 175  * @host: The MMC controller this slot is using.
 176  * @sdc_reg: Value of SDCR to be written before using this slot.
 177  * @sdio_irq: SDIO irq mask for this slot.
 178  * @mrq: mmc_request currently being processed or waiting to be
 179  *      processed, or NULL when the slot is idle.
 180  * @queue_node: List node for placing this node in the @queue list of
 181  *      &struct atmel_mci.
 182  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
 183  * @flags: Random state bits associated with the slot.
 184  * @detect_pin: GPIO pin used for card detection, or negative if not
 185  *      available.
 186  * @wp_pin: GPIO pin used for card write protect sending, or negative
 187  *      if not available.
 188  * @detect_is_active_high: The state of the detect pin when it is active.
 189  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
 190  */
 191 struct atmel_mci_slot {
 192         struct mmc_host         *mmc;
 193         struct atmel_mci        *host;
 194
 195         u32                     sdc_reg;
 196         u32                     sdio_irq;
 197
 198         struct mmc_request      *mrq;
 199         struct list_head        queue_node;
 200
 201         unsigned int            clock;
 202         unsigned long           flags;
 203 #define ATMCI_CARD_PRESENT      0
 204 #define ATMCI_CARD_NEED_INIT    1
 205 #define ATMCI_SHUTDOWN          2
 206 #define ATMCI_SUSPENDED         3
 207
 208         int                     detect_pin;
 209         int                     wp_pin;
 210         bool                    detect_is_active_high;
 211
 212         struct timer_list       detect_timer;
 213 };
 214
 215 #define atmci_test_and_clear_pending(host, event)               \
 216         test_and_clear_bit(event, &host->pending_events)
 217 #define atmci_set_completed(host, event)                        \
 218         set_bit(event, &host->completed_events)
 219 #define atmci_set_pending(host, event)                          \
 220         set_bit(event, &host->pending_events)
 221
 222 /*
 223  * Enable or disable features/registers based on
 224  * whether the processor supports them
 225  */
 226 static bool atmci_has_rwproof(void)
 227 {
 228         if (cpu_is_at91sam9261() || cpu_is_at91rm9200())
 229                 return false;
 230         else
 231                 return true;
 232 }
 233
 234 /*
 235  * The new MCI2 module isn't 100% compatible with the old MCI module,
 236  * and it has a few nice features which we want to use...
 237  */
 238 static inline bool atmci_is_mci2(void)
 239 {
 240         if (cpu_is_at91sam9g45())
 241                 return true;
 242
 243         return false;
 244 }
 245
 246
 247 /*
 248  * The debugfs stuff below is mostly optimized away when
 249  * CONFIG_DEBUG_FS is not set.
 250  */
 251 static int atmci_req_show(struct seq_file *s, void *v)
 252 {
 253         struct atmel_mci_slot   *slot = s->private;
 254         struct mmc_request      *mrq;
 255         struct mmc_command      *cmd;
 256         struct mmc_command      *stop;
 257         struct mmc_data         *data;
 258
 259         /* Make sure we get a consistent snapshot */
 260         spin_lock_bh(&slot->host->lock);
 261         mrq = slot->mrq;
 262
 263         if (mrq) {
 264                 cmd = mrq->cmd;
 265                 data = mrq->data;
 266                 stop = mrq->stop;
 267
 268                 if (cmd)
 269                         seq_printf(s,
 270                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 271                                 cmd->opcode, cmd->arg, cmd->flags,
 272                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
 273                                 cmd->resp[3], cmd->error);
 274                 if (data)
 275                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
 276                                 data->bytes_xfered, data->blocks,
 277                                 data->blksz, data->flags, data->error);
 278                 if (stop)
 279                         seq_printf(s,
 280                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 281                                 stop->opcode, stop->arg, stop->flags,
 282                                 stop->resp[0], stop->resp[1], stop->resp[2],
 283                                 stop->resp[3], stop->error);
 284         }
 285
 286         spin_unlock_bh(&slot->host->lock);
 287
 288         return 0;
 289 }
 290
 291 static int atmci_req_open(struct inode *inode, struct file *file)
 292 {
 293         return single_open(file, atmci_req_show, inode->i_private);
 294 }
 295
 296 static const struct file_operations atmci_req_fops = {
 297         .owner          = THIS_MODULE,
 298         .open           = atmci_req_open,
 299         .read           = seq_read,
 300         .llseek         = seq_lseek,
 301         .release        = single_release,
 302 };
 303
 304 static void atmci_show_status_reg(struct seq_file *s,
 305                 const char *regname, u32 value)
 306 {
 307         static const char       *sr_bit[] = {
 308                 [0]     = "CMDRDY",
 309                 [1]     = "RXRDY",
 310                 [2]     = "TXRDY",
 311                 [3]     = "BLKE",
 312                 [4]     = "DTIP",
 313                 [5]     = "NOTBUSY",
 314                 [6]     = "ENDRX",
 315                 [7]     = "ENDTX",
 316                 [8]     = "SDIOIRQA",
 317                 [9]     = "SDIOIRQB",
 318                 [12]    = "SDIOWAIT",
 319                 [14]    = "RXBUFF",
 320                 [15]    = "TXBUFE",
 321                 [16]    = "RINDE",
 322                 [17]    = "RDIRE",
 323                 [18]    = "RCRCE",
 324                 [19]    = "RENDE",
 325                 [20]    = "RTOE",
 326                 [21]    = "DCRCE",
 327                 [22]    = "DTOE",
 328                 [23]    = "CSTOE",
 329                 [24]    = "BLKOVRE",
 330                 [25]    = "DMADONE",
 331                 [26]    = "FIFOEMPTY",
 332                 [27]    = "XFRDONE",
 333                 [30]    = "OVRE",
 334                 [31]    = "UNRE",
 335         };
 336         unsigned int            i;
 337
 338         seq_printf(s, "%s:\t0x%08x", regname, value);
 339         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
 340                 if (value & (1 << i)) {
 341                         if (sr_bit[i])
 342                                 seq_printf(s, " %s", sr_bit[i]);
 343                         else
 344                                 seq_puts(s, " UNKNOWN");
 345                 }
 346         }
 347         seq_putc(s, '\n');
 348 }
 349
 350 static int atmci_regs_show(struct seq_file *s, void *v)
 351 {
 352         struct atmel_mci        *host = s->private;
 353         u32                     *buf;
 354
 355         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
 356         if (!buf)
 357                 return -ENOMEM;
 358
 359         /*
 360          * Grab a more or less consistent snapshot. Note that we're
 361          * not disabling interrupts, so IMR and SR may not be
 362          * consistent.
 363          */
 364         spin_lock_bh(&host->lock);
 365         clk_enable(host->mck);
 366         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
 367         clk_disable(host->mck);
 368         spin_unlock_bh(&host->lock);
 369
 370         seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
 371                         buf[ATMCI_MR / 4],
 372                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
 373                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "",
 374                         buf[ATMCI_MR / 4] & 0xff);
 375         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
 376         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
 377         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
 378         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
 379                         buf[ATMCI_BLKR / 4],
 380                         buf[ATMCI_BLKR / 4] & 0xffff,
 381                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
 382         if (atmci_is_mci2())
 383                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
 384
 385         /* Don't read RSPR and RDR; it will consume the data there */
 386
 387         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
 388         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
 389
 390         if (atmci_is_mci2()) {
 391                 u32 val;
 392
 393                 val = buf[ATMCI_DMA / 4];
 394                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
 395                                 val, val & 3,
 396                                 ((val >> 4) & 3) ?
 397                                         1 << (((val >> 4) & 3) + 1) : 1,
 398                                 val & ATMCI_DMAEN ? " DMAEN" : "");
 399
 400                 val = buf[ATMCI_CFG / 4];
 401                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
 402                                 val,
 403                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
 404                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
 405                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
 406                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
 407         }
 408
 409         kfree(buf);
 410
 411         return 0;
 412 }
 413
 414 static int atmci_regs_open(struct inode *inode, struct file *file)
 415 {
 416         return single_open(file, atmci_regs_show, inode->i_private);
 417 }
 418
 419 static const struct file_operations atmci_regs_fops = {
 420         .owner          = THIS_MODULE,
 421         .open           = atmci_regs_open,
 422         .read           = seq_read,
 423         .llseek         = seq_lseek,
 424         .release        = single_release,
 425 };
 426
 427 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
 428 {
 429         struct mmc_host         *mmc = slot->mmc;
 430         struct atmel_mci        *host = slot->host;
 431         struct dentry           *root;
 432         struct dentry           *node;
 433
 434         root = mmc->debugfs_root;
 435         if (!root)
 436                 return;
 437
 438         node = debugfs_create_file("regs", S_IRUSR, root, host,
 439                         &atmci_regs_fops);
 440         if (IS_ERR(node))
 441                 return;
 442         if (!node)
 443                 goto err;
 444
 445         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
 446         if (!node)
 447                 goto err;
 448
 449         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
 450         if (!node)
 451                 goto err;
 452
 453         node = debugfs_create_x32("pending_events", S_IRUSR, root,
 454                                      (u32 *)&host->pending_events);
 455         if (!node)
 456                 goto err;
 457
 458         node = debugfs_create_x32("completed_events", S_IRUSR, root,
 459                                      (u32 *)&host->completed_events);
 460         if (!node)
 461                 goto err;
 462
 463         return;
 464
 465 err:
 466         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
 467 }
 468
 469 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
 470                                         unsigned int ns)
 471 {
 472         return (ns * (host->bus_hz / 1000000) + 999) / 1000;
 473 }
 474
 475 static void atmci_set_timeout(struct atmel_mci *host,
 476                 struct atmel_mci_slot *slot, struct mmc_data *data)
 477 {
 478         static unsigned dtomul_to_shift[] = {
 479                 0, 4, 7, 8, 10, 12, 16, 20
 480         };
 481         unsigned        timeout;
 482         unsigned        dtocyc;
 483         unsigned        dtomul;
 484
 485         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
 486                 + data->timeout_clks;
 487
 488         for (dtomul = 0; dtomul < 8; dtomul++) {
 489                 unsigned shift = dtomul_to_shift[dtomul];
 490                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
 491                 if (dtocyc < 15)
 492                         break;
 493         }
 494
 495         if (dtomul >= 8) {
 496                 dtomul = 7;
 497                 dtocyc = 15;
 498         }
 499
 500         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
 501                         dtocyc << dtomul_to_shift[dtomul]);
 502         atmci_writel(host, DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
 503 }
 504
 505 /*
 506  * Return mask with command flags to be enabled for this command.
 507  */
 508 static u32 atmci_prepare_command(struct mmc_host *mmc,
 509                                  struct mmc_command *cmd)
 510 {
 511         struct mmc_data *data;
 512         u32             cmdr;
 513
 514         cmd->error = -EINPROGRESS;
 515
 516         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
 517
 518         if (cmd->flags & MMC_RSP_PRESENT) {
 519                 if (cmd->flags & MMC_RSP_136)
 520                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
 521                 else
 522                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
 523         }
 524
 525         /*
 526          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
 527          * it's too difficult to determine whether this is an ACMD or
 528          * not. Better make it 64.
 529          */
 530         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
 531
 532         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
 533                 cmdr |= ATMCI_CMDR_OPDCMD;
 534
 535         data = cmd->data;
 536         if (data) {
 537                 cmdr |= ATMCI_CMDR_START_XFER;
 538
 539                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
 540                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
 541                 } else {
 542                         if (data->flags & MMC_DATA_STREAM)
 543                                 cmdr |= ATMCI_CMDR_STREAM;
 544                         else if (data->blocks > 1)
 545                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
 546                         else
 547                                 cmdr |= ATMCI_CMDR_BLOCK;
 548                 }
 549
 550                 if (data->flags & MMC_DATA_READ)
 551                         cmdr |= ATMCI_CMDR_TRDIR_READ;
 552         }
 553
 554         return cmdr;
 555 }
 556
 557 static void atmci_start_command(struct atmel_mci *host,
 558                 struct mmc_command *cmd, u32 cmd_flags)
 559 {
 560         WARN_ON(host->cmd);
 561         host->cmd = cmd;
 562
 563         dev_vdbg(&host->pdev->dev,
 564                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
 565                         cmd->arg, cmd_flags);
 566
 567         atmci_writel(host, ARGR, cmd->arg);
 568         atmci_writel(host, CMDR, cmd_flags);
 569 }
 570
 571 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
 572 {
 573         atmci_start_command(host, data->stop, host->stop_cmdr);
 574         atmci_writel(host, IER, ATMCI_CMDRDY);
 575 }
 576
 577 #ifdef CONFIG_MMC_ATMELMCI_DMA
 578 static void atmci_dma_cleanup(struct atmel_mci *host)
 579 {
 580         struct mmc_data                 *data = host->data;
 581
 582         if (data)
 583                 dma_unmap_sg(host->dma.chan->device->dev,
 584                              data->sg, data->sg_len,
 585                              ((data->flags & MMC_DATA_WRITE)
 586                               ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
 587 }
 588
 589 static void atmci_stop_dma(struct atmel_mci *host)
 590 {
 591         struct dma_chan *chan = host->data_chan;
 592
 593         if (chan) {
 594                 dmaengine_terminate_all(chan);
 595                 atmci_dma_cleanup(host);
 596         } else {
 597                 /* Data transfer was stopped by the interrupt handler */
 598                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
 599                 atmci_writel(host, IER, ATMCI_NOTBUSY);
 600         }
 601 }
 602
 603 /* This function is called by the DMA driver from tasklet context. */
 604 static void atmci_dma_complete(void *arg)
 605 {
 606         struct atmel_mci        *host = arg;
 607         struct mmc_data         *data = host->data;
 608
 609         dev_vdbg(&host->pdev->dev, "DMA complete\n");
 610
 611         if (atmci_is_mci2())
 612                 /* Disable DMA hardware handshaking on MCI */
 613                 atmci_writel(host, DMA, atmci_readl(host, DMA) & ~ATMCI_DMAEN);
 614
 615         atmci_dma_cleanup(host);
 616
 617         /*
 618          * If the card was removed, data will be NULL. No point trying
 619          * to send the stop command or waiting for NBUSY in this case.
 620          */
 621         if (data) {
 622                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
 623                 tasklet_schedule(&host->tasklet);
 624
 625                 /*
 626                  * Regardless of what the documentation says, we have
 627                  * to wait for NOTBUSY even after block read
 628                  * operations.
 629                  *
 630                  * When the DMA transfer is complete, the controller
 631                  * may still be reading the CRC from the card, i.e.
 632                  * the data transfer is still in progress and we
 633                  * haven't seen all the potential error bits yet.
 634                  *
 635                  * The interrupt handler will schedule a different
 636                  * tasklet to finish things up when the data transfer
 637                  * is completely done.
 638                  *
 639                  * We may not complete the mmc request here anyway
 640                  * because the mmc layer may call back and cause us to
 641                  * violate the "don't submit new operations from the
 642                  * completion callback" rule of the dma engine
 643                  * framework.
 644                  */
 645                 atmci_writel(host, IER, ATMCI_NOTBUSY);
 646         }
 647 }
 648
 649 static int
 650 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 651 {
 652         struct dma_chan                 *chan;
 653         struct dma_async_tx_descriptor  *desc;
 654         struct scatterlist              *sg;
 655         unsigned int                    i;
 656         enum dma_data_direction         direction;
 657         unsigned int                    sglen;
 658
 659         /*
 660          * We don't do DMA on "complex" transfers, i.e. with
 661          * non-word-aligned buffers or lengths. Also, we don't bother
 662          * with all the DMA setup overhead for short transfers.
 663          */
 664         if (data->blocks * data->blksz < ATATMCI_DMA_THRESHOLD)
 665                 return -EINVAL;
 666         if (data->blksz & 3)
 667                 return -EINVAL;
 668
 669         for_each_sg(data->sg, sg, data->sg_len, i) {
 670                 if (sg->offset & 3 || sg->length & 3)
 671                         return -EINVAL;
 672         }
 673
 674         /* If we don't have a channel, we can't do DMA */
 675         chan = host->dma.chan;
 676         if (chan)
 677                 host->data_chan = chan;
 678
 679         if (!chan)
 680                 return -ENODEV;
 681
 682         if (atmci_is_mci2())
 683                 atmci_writel(host, DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
 684
 685         if (data->flags & MMC_DATA_READ)
 686                 direction = DMA_FROM_DEVICE;
 687         else
 688                 direction = DMA_TO_DEVICE;
 689
 690         sglen = dma_map_sg(chan->device->dev, data->sg,
 691                            data->sg_len, direction);
 692
 693         desc = chan->device->device_prep_slave_sg(chan,
 694                         data->sg, sglen, direction,
 695                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 696         if (!desc)
 697                 goto unmap_exit;
 698
 699         host->dma.data_desc = desc;
 700         desc->callback = atmci_dma_complete;
 701         desc->callback_param = host;
 702
 703         return 0;
 704 unmap_exit:
 705         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
 706         return -ENOMEM;
 707 }
 708
 709 static void atmci_submit_data(struct atmel_mci *host)
 710 {
 711         struct dma_chan                 *chan = host->data_chan;
 712         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
 713
 714         if (chan) {
 715                 dmaengine_submit(desc);
 716                 dma_async_issue_pending(chan);
 717         }
 718 }
 719
 720 #else /* CONFIG_MMC_ATMELMCI_DMA */
 721
 722 static int atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
 723 {
 724         return -ENOSYS;
 725 }
 726
 727 static void atmci_submit_data(struct atmel_mci *host) {}
 728
 729 static void atmci_stop_dma(struct atmel_mci *host)
 730 {
 731         /* Data transfer was stopped by the interrupt handler */
 732         atmci_set_pending(host, EVENT_XFER_COMPLETE);
 733         atmci_writel(host, IER, ATMCI_NOTBUSY);
 734 }
 735
 736 #endif /* CONFIG_MMC_ATMELMCI_DMA */
 737
 738 /*
 739  * Returns a mask of interrupt flags to be enabled after the whole
 740  * request has been prepared.
 741  */
 742 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
 743 {
 744         u32 iflags;
 745
 746         data->error = -EINPROGRESS;
 747
 748         WARN_ON(host->data);
 749         host->sg = NULL;
 750         host->data = data;
 751
 752         iflags = ATMCI_DATA_ERROR_FLAGS;
 753         if (atmci_prepare_data_dma(host, data)) {
 754                 host->data_chan = NULL;
 755
 756                 /*
 757                  * Errata: MMC data write operation with less than 12
 758                  * bytes is impossible.
 759                  *
 760                  * Errata: MCI Transmit Data Register (TDR) FIFO
 761                  * corruption when length is not multiple of 4.
 762                  */
 763                 if (data->blocks * data->blksz < 12
 764                                 || (data->blocks * data->blksz) & 3)
 765                         host->need_reset = true;
 766
 767                 host->sg = data->sg;
 768                 host->pio_offset = 0;
 769                 if (data->flags & MMC_DATA_READ)
 770                         iflags |= ATMCI_RXRDY;
 771                 else
 772                         iflags |= ATMCI_TXRDY;
 773         }
 774
 775         return iflags;
 776 }
 777
 778 static void atmci_start_request(struct atmel_mci *host,
 779                 struct atmel_mci_slot *slot)
 780 {
 781         struct mmc_request      *mrq;
 782         struct mmc_command      *cmd;
 783         struct mmc_data         *data;
 784         u32                     iflags;
 785         u32                     cmdflags;
 786
 787         mrq = slot->mrq;
 788         host->cur_slot = slot;
 789         host->mrq = mrq;
 790
 791         host->pending_events = 0;
 792         host->completed_events = 0;
 793         host->data_status = 0;
 794
 795         if (host->need_reset) {
 796                 atmci_writel(host, CR, ATMCI_CR_SWRST);
 797                 atmci_writel(host, CR, ATMCI_CR_MCIEN);
 798                 atmci_writel(host, MR, host->mode_reg);
 799                 if (atmci_is_mci2())
 800                         atmci_writel(host, CFG, host->cfg_reg);
 801                 host->need_reset = false;
 802         }
 803         atmci_writel(host, SDCR, slot->sdc_reg);
 804
 805         iflags = atmci_readl(host, IMR);
 806         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
 807                 dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
 808                                 iflags);
 809
 810         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
 811                 /* Send init sequence (74 clock cycles) */
 812                 atmci_writel(host, CMDR, ATMCI_CMDR_SPCMD_INIT);
 813                 while (!(atmci_readl(host, SR) & ATMCI_CMDRDY))
 814                         cpu_relax();
 815         }
 816         iflags = 0;
 817         data = mrq->data;
 818         if (data) {
 819                 atmci_set_timeout(host, slot, data);
 820
 821                 /* Must set block count/size before sending command */
 822                 atmci_writel(host, BLKR, ATMCI_BCNT(data->blocks)
 823                                 | ATMCI_BLKLEN(data->blksz));
 824                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
 825                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
 826
 827                 iflags |= atmci_prepare_data(host, data);
 828         }
 829
 830         iflags |= ATMCI_CMDRDY;
 831         cmd = mrq->cmd;
 832         cmdflags = atmci_prepare_command(slot->mmc, cmd);
 833         atmci_start_command(host, cmd, cmdflags);
 834
 835         if (data)
 836                 atmci_submit_data(host);
 837
 838         if (mrq->stop) {
 839                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
 840                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
 841                 if (!(data->flags & MMC_DATA_WRITE))
 842                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
 843                 if (data->flags & MMC_DATA_STREAM)
 844                         host->stop_cmdr |= ATMCI_CMDR_STREAM;
 845                 else
 846                         host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
 847         }
 848
 849         /*
 850          * We could have enabled interrupts earlier, but I suspect
 851          * that would open up a nice can of interesting race
 852          * conditions (e.g. command and data complete, but stop not
 853          * prepared yet.)
 854          */
 855         atmci_writel(host, IER, iflags);
 856 }
 857
 858 static void atmci_queue_request(struct atmel_mci *host,
 859                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
 860 {
 861         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
 862                         host->state);
 863
 864         spin_lock_bh(&host->lock);
 865         slot->mrq = mrq;
 866         if (host->state == STATE_IDLE) {
 867                 host->state = STATE_SENDING_CMD;
 868                 atmci_start_request(host, slot);
 869         } else {
 870                 list_add_tail(&slot->queue_node, &host->queue);
 871         }
 872         spin_unlock_bh(&host->lock);
 873 }
 874
 875 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 876 {
 877         struct atmel_mci_slot   *slot = mmc_priv(mmc);
 878         struct atmel_mci        *host = slot->host;
 879         struct mmc_data         *data;
 880
 881         WARN_ON(slot->mrq);
 882
 883         /*
 884          * We may "know" the card is gone even though there's still an
 885          * electrical connection. If so, we really need to communicate
 886          * this to the MMC core since there won't be any more
 887          * interrupts as the card is completely removed. Otherwise,
 888          * the MMC core might believe the card is still there even
 889          * though the card was just removed very slowly.
 890          */
 891         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
 892                 mrq->cmd->error = -ENOMEDIUM;
 893                 mmc_request_done(mmc, mrq);
 894                 return;
 895         }
 896
 897         /* We don't support multiple blocks of weird lengths. */
 898         data = mrq->data;
 899         if (data && data->blocks > 1 && data->blksz & 3) {
 900                 mrq->cmd->error = -EINVAL;
 901                 mmc_request_done(mmc, mrq);
 902         }
 903
 904         atmci_queue_request(host, slot, mrq);
 905 }
 906
 907 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 908 {
 909         struct atmel_mci_slot   *slot = mmc_priv(mmc);
 910         struct atmel_mci        *host = slot->host;
 911         unsigned int            i;
 912
 913         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
 914         switch (ios->bus_width) {
 915         case MMC_BUS_WIDTH_1:
 916                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
 917                 break;
 918         case MMC_BUS_WIDTH_4:
 919                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
 920                 break;
 921         }
 922
 923         if (ios->clock) {
 924                 unsigned int clock_min = ~0U;
 925                 u32 clkdiv;
 926
 927                 spin_lock_bh(&host->lock);
 928                 if (!host->mode_reg) {
 929                         clk_enable(host->mck);
 930                         atmci_writel(host, CR, ATMCI_CR_SWRST);
 931                         atmci_writel(host, CR, ATMCI_CR_MCIEN);
 932                         if (atmci_is_mci2())
 933                                 atmci_writel(host, CFG, host->cfg_reg);
 934                 }
 935
 936                 /*
 937                  * Use mirror of ios->clock to prevent race with mmc
 938                  * core ios update when finding the minimum.
 939                  */
 940                 slot->clock = ios->clock;
 941                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 942                         if (host->slot[i] && host->slot[i]->clock
 943                                         && host->slot[i]->clock < clock_min)
 944                                 clock_min = host->slot[i]->clock;
 945                 }
 946
 947                 /* Calculate clock divider */
 948                 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
 949                 if (clkdiv > 255) {
 950                         dev_warn(&mmc->class_dev,
 951                                 "clock %u too slow; using %lu\n",
 952                                 clock_min, host->bus_hz / (2 * 256));
 953                         clkdiv = 255;
 954                 }
 955
 956                 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
 957
 958                 /*
 959                  * WRPROOF and RDPROOF prevent overruns/underruns by
 960                  * stopping the clock when the FIFO is full/empty.
 961                  * This state is not expected to last for long.
 962                  */
 963                 if (atmci_has_rwproof())
 964                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
 965
 966                 if (atmci_is_mci2()) {
 967                         /* setup High Speed mode in relation with card capacity */
 968                         if (ios->timing == MMC_TIMING_SD_HS)
 969                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
 970                         else
 971                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
 972                 }
 973
 974                 if (list_empty(&host->queue)) {
 975                         atmci_writel(host, MR, host->mode_reg);
 976                         if (atmci_is_mci2())
 977                                 atmci_writel(host, CFG, host->cfg_reg);
 978                 } else {
 979                         host->need_clock_update = true;
 980                 }
 981
 982                 spin_unlock_bh(&host->lock);
 983         } else {
 984                 bool any_slot_active = false;
 985
 986                 spin_lock_bh(&host->lock);
 987                 slot->clock = 0;
 988                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
 989                         if (host->slot[i] && host->slot[i]->clock) {
 990                                 any_slot_active = true;
 991                                 break;
 992                         }
 993                 }
 994                 if (!any_slot_active) {
 995                         atmci_writel(host, CR, ATMCI_CR_MCIDIS);
 996                         if (host->mode_reg) {
 997                                 atmci_readl(host, MR);
 998                                 clk_disable(host->mck);
 999                         }
1000                         host->mode_reg = 0;
1001                 }
1002                 spin_unlock_bh(&host->lock);
1003         }
1004
1005         switch (ios->power_mode) {
1006         case MMC_POWER_UP:
1007                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1008                 break;
1009         default:
1010                 /*
1011                  * TODO: None of the currently available AVR32-based
1012                  * boards allow MMC power to be turned off. Implement
1013                  * power control when this can be tested properly.
1014                  *
1015                  * We also need to hook this into the clock management
1016                  * somehow so that newly inserted cards aren't
1017                  * subjected to a fast clock before we have a chance
1018                  * to figure out what the maximum rate is. Currently,
1019                  * there's no way to avoid this, and there never will
1020                  * be for boards that don't support power control.
1021                  */
1022                 break;
1023         }
1024 }
1025
1026 static int atmci_get_ro(struct mmc_host *mmc)
1027 {
1028         int                     read_only = -ENOSYS;
1029         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1030
1031         if (gpio_is_valid(slot->wp_pin)) {
1032                 read_only = gpio_get_value(slot->wp_pin);
1033                 dev_dbg(&mmc->class_dev, "card is %s\n",
1034                                 read_only ? "read-only" : "read-write");
1035         }
1036
1037         return read_only;
1038 }
1039
1040 static int atmci_get_cd(struct mmc_host *mmc)
1041 {
1042         int                     present = -ENOSYS;
1043         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1044
1045         if (gpio_is_valid(slot->detect_pin)) {
1046                 present = !(gpio_get_value(slot->detect_pin) ^
1047                             slot->detect_is_active_high);
1048                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1049                                 present ? "" : "not ");
1050         }
1051
1052         return present;
1053 }
1054
1055 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1056 {
1057         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1058         struct atmel_mci        *host = slot->host;
1059
1060         if (enable)
1061                 atmci_writel(host, IER, slot->sdio_irq);
1062         else
1063                 atmci_writel(host, IDR, slot->sdio_irq);
1064 }
1065
1066 static const struct mmc_host_ops atmci_ops = {
1067         .request        = atmci_request,
1068         .set_ios        = atmci_set_ios,
1069         .get_ro         = atmci_get_ro,
1070         .get_cd         = atmci_get_cd,
1071         .enable_sdio_irq = atmci_enable_sdio_irq,
1072 };
1073
1074 /* Called with host->lock held */
1075 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1076         __releases(&host->lock)
1077         __acquires(&host->lock)
1078 {
1079         struct atmel_mci_slot   *slot = NULL;
1080         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1081
1082         WARN_ON(host->cmd || host->data);
1083
1084         /*
1085          * Update the MMC clock rate if necessary. This may be
1086          * necessary if set_ios() is called when a different slot is
1087          * busy transferring data.
1088          */
1089         if (host->need_clock_update) {
1090                 atmci_writel(host, MR, host->mode_reg);
1091                 if (atmci_is_mci2())
1092                         atmci_writel(host, CFG, host->cfg_reg);
1093         }
1094
1095         host->cur_slot->mrq = NULL;
1096         host->mrq = NULL;
1097         if (!list_empty(&host->queue)) {
1098                 slot = list_entry(host->queue.next,
1099                                 struct atmel_mci_slot, queue_node);
1100                 list_del(&slot->queue_node);
1101                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1102                                 mmc_hostname(slot->mmc));
1103                 host->state = STATE_SENDING_CMD;
1104                 atmci_start_request(host, slot);
1105         } else {
1106                 dev_vdbg(&host->pdev->dev, "list empty\n");
1107                 host->state = STATE_IDLE;
1108         }
1109
1110         spin_unlock(&host->lock);
1111         mmc_request_done(prev_mmc, mrq);
1112         spin_lock(&host->lock);
1113 }
1114
1115 static void atmci_command_complete(struct atmel_mci *host,
1116                         struct mmc_command *cmd)
1117 {
1118         u32             status = host->cmd_status;
1119
1120         /* Read the response from the card (up to 16 bytes) */
1121         cmd->resp[0] = atmci_readl(host, RSPR);
1122         cmd->resp[1] = atmci_readl(host, RSPR);
1123         cmd->resp[2] = atmci_readl(host, RSPR);
1124         cmd->resp[3] = atmci_readl(host, RSPR);
1125
1126         if (status & ATMCI_RTOE)
1127                 cmd->error = -ETIMEDOUT;
1128         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1129                 cmd->error = -EILSEQ;
1130         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1131                 cmd->error = -EIO;
1132         else
1133                 cmd->error = 0;
1134
1135         if (cmd->error) {
1136                 dev_dbg(&host->pdev->dev,
1137                         "command error: status=0x%08x\n", status);
1138
1139                 if (cmd->data) {
1140                         atmci_stop_dma(host);
1141                         host->data = NULL;
1142                         atmci_writel(host, IDR, ATMCI_NOTBUSY
1143                                         | ATMCI_TXRDY | ATMCI_RXRDY
1144                                         | ATMCI_DATA_ERROR_FLAGS);
1145                 }
1146         }
1147 }
1148
1149 static void atmci_detect_change(unsigned long data)
1150 {
1151         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1152         bool                    present;
1153         bool                    present_old;
1154
1155         /*
1156          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1157          * freeing the interrupt. We must not re-enable the interrupt
1158          * if it has been freed, and if we're shutting down, it
1159          * doesn't really matter whether the card is present or not.
1160          */
1161         smp_rmb();
1162         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1163                 return;
1164
1165         enable_irq(gpio_to_irq(slot->detect_pin));
1166         present = !(gpio_get_value(slot->detect_pin) ^
1167                     slot->detect_is_active_high);
1168         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1169
1170         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1171                         present, present_old);
1172
1173         if (present != present_old) {
1174                 struct atmel_mci        *host = slot->host;
1175                 struct mmc_request      *mrq;
1176
1177                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1178                         present ? "inserted" : "removed");
1179
1180                 spin_lock(&host->lock);
1181
1182                 if (!present)
1183                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1184                 else
1185                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1186
1187                 /* Clean up queue if present */
1188                 mrq = slot->mrq;
1189                 if (mrq) {
1190                         if (mrq == host->mrq) {
1191                                 /*
1192                                  * Reset controller to terminate any ongoing
1193                                  * commands or data transfers.
1194                                  */
1195                                 atmci_writel(host, CR, ATMCI_CR_SWRST);
1196                                 atmci_writel(host, CR, ATMCI_CR_MCIEN);
1197                                 atmci_writel(host, MR, host->mode_reg);
1198                                 if (atmci_is_mci2())
1199                                         atmci_writel(host, CFG, host->cfg_reg);
1200
1201                                 host->data = NULL;
1202                                 host->cmd = NULL;
1203
1204                                 switch (host->state) {
1205                                 case STATE_IDLE:
1206                                         break;
1207                                 case STATE_SENDING_CMD:
1208                                         mrq->cmd->error = -ENOMEDIUM;
1209                                         if (!mrq->data)
1210                                                 break;
1211                                         /* fall through */
1212                                 case STATE_SENDING_DATA:
1213                                         mrq->data->error = -ENOMEDIUM;
1214                                         atmci_stop_dma(host);
1215                                         break;
1216                                 case STATE_DATA_BUSY:
1217                                 case STATE_DATA_ERROR:
1218                                         if (mrq->data->error == -EINPROGRESS)
1219                                                 mrq->data->error = -ENOMEDIUM;
1220                                         if (!mrq->stop)
1221                                                 break;
1222                                         /* fall through */
1223                                 case STATE_SENDING_STOP:
1224                                         mrq->stop->error = -ENOMEDIUM;
1225                                         break;
1226                                 }
1227
1228                                 atmci_request_end(host, mrq);
1229                         } else {
1230                                 list_del(&slot->queue_node);
1231                                 mrq->cmd->error = -ENOMEDIUM;
1232                                 if (mrq->data)
1233                                         mrq->data->error = -ENOMEDIUM;
1234                                 if (mrq->stop)
1235                                         mrq->stop->error = -ENOMEDIUM;
1236
1237                                 spin_unlock(&host->lock);
1238                                 mmc_request_done(slot->mmc, mrq);
1239                                 spin_lock(&host->lock);
1240                         }
1241                 }
1242                 spin_unlock(&host->lock);
1243
1244                 mmc_detect_change(slot->mmc, 0);
1245         }
1246 }
1247
1248 static void atmci_tasklet_func(unsigned long priv)
1249 {
1250         struct atmel_mci        *host = (struct atmel_mci *)priv;
1251         struct mmc_request      *mrq = host->mrq;
1252         struct mmc_data         *data = host->data;
1253         struct mmc_command      *cmd = host->cmd;
1254         enum atmel_mci_state    state = host->state;
1255         enum atmel_mci_state    prev_state;
1256         u32                     status;
1257
1258         spin_lock(&host->lock);
1259
1260         state = host->state;
1261
1262         dev_vdbg(&host->pdev->dev,
1263                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1264                 state, host->pending_events, host->completed_events,
1265                 atmci_readl(host, IMR));
1266
1267         do {
1268                 prev_state = state;
1269
1270                 switch (state) {
1271                 case STATE_IDLE:
1272                         break;
1273
1274                 case STATE_SENDING_CMD:
1275                         if (!atmci_test_and_clear_pending(host,
1276                                                 EVENT_CMD_COMPLETE))
1277                                 break;
1278
1279                         host->cmd = NULL;
1280                         atmci_set_completed(host, EVENT_CMD_COMPLETE);
1281                         atmci_command_complete(host, mrq->cmd);
1282                         if (!mrq->data || cmd->error) {
1283                                 atmci_request_end(host, host->mrq);
1284                                 goto unlock;
1285                         }
1286
1287                         prev_state = state = STATE_SENDING_DATA;
1288                         /* fall through */
1289
1290                 case STATE_SENDING_DATA:
1291                         if (atmci_test_and_clear_pending(host,
1292                                                 EVENT_DATA_ERROR)) {
1293                                 atmci_stop_dma(host);
1294                                 if (data->stop)
1295                                         atmci_send_stop_cmd(host, data);
1296                                 state = STATE_DATA_ERROR;
1297                                 break;
1298                         }
1299
1300                         if (!atmci_test_and_clear_pending(host,
1301                                                 EVENT_XFER_COMPLETE))
1302                                 break;
1303
1304                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1305                         prev_state = state = STATE_DATA_BUSY;
1306                         /* fall through */
1307
1308                 case STATE_DATA_BUSY:
1309                         if (!atmci_test_and_clear_pending(host,
1310                                                 EVENT_DATA_COMPLETE))
1311                                 break;
1312
1313                         host->data = NULL;
1314                         atmci_set_completed(host, EVENT_DATA_COMPLETE);
1315                         status = host->data_status;
1316                         if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) {
1317                                 if (status & ATMCI_DTOE) {
1318                                         dev_dbg(&host->pdev->dev,
1319                                                         "data timeout error\n");
1320                                         data->error = -ETIMEDOUT;
1321                                 } else if (status & ATMCI_DCRCE) {
1322                                         dev_dbg(&host->pdev->dev,
1323                                                         "data CRC error\n");
1324                                         data->error = -EILSEQ;
1325                                 } else {
1326                                         dev_dbg(&host->pdev->dev,
1327                                                 "data FIFO error (status=%08x)\n",
1328                                                 status);
1329                                         data->error = -EIO;
1330                                 }
1331                         } else {
1332                                 data->bytes_xfered = data->blocks * data->blksz;
1333                                 data->error = 0;
1334                                 atmci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS);
1335                         }
1336
1337                         if (!data->stop) {
1338                                 atmci_request_end(host, host->mrq);
1339                                 goto unlock;
1340                         }
1341
1342                         prev_state = state = STATE_SENDING_STOP;
1343                         if (!data->error)
1344                                 atmci_send_stop_cmd(host, data);
1345                         /* fall through */
1346
1347                 case STATE_SENDING_STOP:
1348                         if (!atmci_test_and_clear_pending(host,
1349                                                 EVENT_CMD_COMPLETE))
1350                                 break;
1351
1352                         host->cmd = NULL;
1353                         atmci_command_complete(host, mrq->stop);
1354                         atmci_request_end(host, host->mrq);
1355                         goto unlock;
1356
1357                 case STATE_DATA_ERROR:
1358                         if (!atmci_test_and_clear_pending(host,
1359                                                 EVENT_XFER_COMPLETE))
1360                                 break;
1361
1362                         state = STATE_DATA_BUSY;
1363                         break;
1364                 }
1365         } while (state != prev_state);
1366
1367         host->state = state;
1368
1369 unlock:
1370         spin_unlock(&host->lock);
1371 }
1372
1373 static void atmci_read_data_pio(struct atmel_mci *host)
1374 {
1375         struct scatterlist      *sg = host->sg;
1376         void                    *buf = sg_virt(sg);
1377         unsigned int            offset = host->pio_offset;
1378         struct mmc_data         *data = host->data;
1379         u32                     value;
1380         u32                     status;
1381         unsigned int            nbytes = 0;
1382
1383         do {
1384                 value = atmci_readl(host, RDR);
1385                 if (likely(offset + 4 <= sg->length)) {
1386                         put_unaligned(value, (u32 *)(buf + offset));
1387
1388                         offset += 4;
1389                         nbytes += 4;
1390
1391                         if (offset == sg->length) {
1392                                 flush_dcache_page(sg_page(sg));
1393                                 host->sg = sg = sg_next(sg);
1394                                 if (!sg)
1395                                         goto done;
1396
1397                                 offset = 0;
1398                                 buf = sg_virt(sg);
1399                         }
1400                 } else {
1401                         unsigned int remaining = sg->length - offset;
1402                         memcpy(buf + offset, &value, remaining);
1403                         nbytes += remaining;
1404
1405                         flush_dcache_page(sg_page(sg));
1406                         host->sg = sg = sg_next(sg);
1407                         if (!sg)
1408                                 goto done;
1409
1410                         offset = 4 - remaining;
1411                         buf = sg_virt(sg);
1412                         memcpy(buf, (u8 *)&value + remaining, offset);
1413                         nbytes += offset;
1414                 }
1415
1416                 status = atmci_readl(host, SR);
1417                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1418                         atmci_writel(host, IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1419                                                 | ATMCI_DATA_ERROR_FLAGS));
1420                         host->data_status = status;
1421                         data->bytes_xfered += nbytes;
1422                         smp_wmb();
1423                         atmci_set_pending(host, EVENT_DATA_ERROR);
1424                         tasklet_schedule(&host->tasklet);
1425                         return;
1426                 }
1427         } while (status & ATMCI_RXRDY);
1428
1429         host->pio_offset = offset;
1430         data->bytes_xfered += nbytes;
1431
1432         return;
1433
1434 done:
1435         atmci_writel(host, IDR, ATMCI_RXRDY);
1436         atmci_writel(host, IER, ATMCI_NOTBUSY);
1437         data->bytes_xfered += nbytes;
1438         smp_wmb();
1439         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1440 }
1441
1442 static void atmci_write_data_pio(struct atmel_mci *host)
1443 {
1444         struct scatterlist      *sg = host->sg;
1445         void                    *buf = sg_virt(sg);
1446         unsigned int            offset = host->pio_offset;
1447         struct mmc_data         *data = host->data;
1448         u32                     value;
1449         u32                     status;
1450         unsigned int            nbytes = 0;
1451
1452         do {
1453                 if (likely(offset + 4 <= sg->length)) {
1454                         value = get_unaligned((u32 *)(buf + offset));
1455                         atmci_writel(host, TDR, value);
1456
1457                         offset += 4;
1458                         nbytes += 4;
1459                         if (offset == sg->length) {
1460                                 host->sg = sg = sg_next(sg);
1461                                 if (!sg)
1462                                         goto done;
1463
1464                                 offset = 0;
1465                                 buf = sg_virt(sg);
1466                         }
1467                 } else {
1468                         unsigned int remaining = sg->length - offset;
1469
1470                         value = 0;
1471                         memcpy(&value, buf + offset, remaining);
1472                         nbytes += remaining;
1473
1474                         host->sg = sg = sg_next(sg);
1475                         if (!sg) {
1476                                 atmci_writel(host, TDR, value);
1477                                 goto done;
1478                         }
1479
1480                         offset = 4 - remaining;
1481                         buf = sg_virt(sg);
1482                         memcpy((u8 *)&value + remaining, buf, offset);
1483                         atmci_writel(host, TDR, value);
1484                         nbytes += offset;
1485                 }
1486
1487                 status = atmci_readl(host, SR);
1488                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1489                         atmci_writel(host, IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1490                                                 | ATMCI_DATA_ERROR_FLAGS));
1491                         host->data_status = status;
1492                         data->bytes_xfered += nbytes;
1493                         smp_wmb();
1494                         atmci_set_pending(host, EVENT_DATA_ERROR);
1495                         tasklet_schedule(&host->tasklet);
1496                         return;
1497                 }
1498         } while (status & ATMCI_TXRDY);
1499
1500         host->pio_offset = offset;
1501         data->bytes_xfered += nbytes;
1502
1503         return;
1504
1505 done:
1506         atmci_writel(host, IDR, ATMCI_TXRDY);
1507         atmci_writel(host, IER, ATMCI_NOTBUSY);
1508         data->bytes_xfered += nbytes;
1509         smp_wmb();
1510         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1511 }
1512
1513 static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
1514 {
1515         atmci_writel(host, IDR, ATMCI_CMDRDY);
1516
1517         host->cmd_status = status;
1518         smp_wmb();
1519         atmci_set_pending(host, EVENT_CMD_COMPLETE);
1520         tasklet_schedule(&host->tasklet);
1521 }
1522
1523 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1524 {
1525         int     i;
1526
1527         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1528                 struct atmel_mci_slot *slot = host->slot[i];
1529                 if (slot && (status & slot->sdio_irq)) {
1530                         mmc_signal_sdio_irq(slot->mmc);
1531                 }
1532         }
1533 }
1534
1535
1536 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1537 {
1538         struct atmel_mci        *host = dev_id;
1539         u32                     status, mask, pending;
1540         unsigned int            pass_count = 0;
1541
1542         do {
1543                 status = atmci_readl(host, SR);
1544                 mask = atmci_readl(host, IMR);
1545                 pending = status & mask;
1546                 if (!pending)
1547                         break;
1548
1549                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
1550                         atmci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS
1551                                         | ATMCI_RXRDY | ATMCI_TXRDY);
1552                         pending &= atmci_readl(host, IMR);
1553
1554                         host->data_status = status;
1555                         smp_wmb();
1556                         atmci_set_pending(host, EVENT_DATA_ERROR);
1557                         tasklet_schedule(&host->tasklet);
1558                 }
1559                 if (pending & ATMCI_NOTBUSY) {
1560                         atmci_writel(host, IDR,
1561                                         ATMCI_DATA_ERROR_FLAGS | ATMCI_NOTBUSY);
1562                         if (!host->data_status)
1563                                 host->data_status = status;
1564                         smp_wmb();
1565                         atmci_set_pending(host, EVENT_DATA_COMPLETE);
1566                         tasklet_schedule(&host->tasklet);
1567                 }
1568                 if (pending & ATMCI_RXRDY)
1569                         atmci_read_data_pio(host);
1570                 if (pending & ATMCI_TXRDY)
1571                         atmci_write_data_pio(host);
1572
1573                 if (pending & ATMCI_CMDRDY)
1574                         atmci_cmd_interrupt(host, status);
1575
1576                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1577                         atmci_sdio_interrupt(host, status);
1578
1579         } while (pass_count++ < 5);
1580
1581         return pass_count ? IRQ_HANDLED : IRQ_NONE;
1582 }
1583
1584 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
1585 {
1586         struct atmel_mci_slot   *slot = dev_id;
1587
1588         /*
1589          * Disable interrupts until the pin has stabilized and check
1590          * the state then. Use mod_timer() since we may be in the
1591          * middle of the timer routine when this interrupt triggers.
1592          */
1593         disable_irq_nosync(irq);
1594         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
1595
1596         return IRQ_HANDLED;
1597 }
1598
1599 static int __init atmci_init_slot(struct atmel_mci *host,
1600                 struct mci_slot_pdata *slot_data, unsigned int id,
1601                 u32 sdc_reg, u32 sdio_irq)
1602 {
1603         struct mmc_host                 *mmc;
1604         struct atmel_mci_slot           *slot;
1605
1606         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
1607         if (!mmc)
1608                 return -ENOMEM;
1609
1610         slot = mmc_priv(mmc);
1611         slot->mmc = mmc;
1612         slot->host = host;
1613         slot->detect_pin = slot_data->detect_pin;
1614         slot->wp_pin = slot_data->wp_pin;
1615         slot->detect_is_active_high = slot_data->detect_is_active_high;
1616         slot->sdc_reg = sdc_reg;
1617         slot->sdio_irq = sdio_irq;
1618
1619         mmc->ops = &atmci_ops;
1620         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
1621         mmc->f_max = host->bus_hz / 2;
1622         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1623         if (sdio_irq)
1624                 mmc->caps |= MMC_CAP_SDIO_IRQ;
1625         if (atmci_is_mci2())
1626                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1627         if (slot_data->bus_width >= 4)
1628                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1629
1630         mmc->max_segs = 64;
1631         mmc->max_req_size = 32768 * 512;
1632         mmc->max_blk_size = 32768;
1633         mmc->max_blk_count = 512;
1634
1635         /* Assume card is present initially */
1636         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1637         if (gpio_is_valid(slot->detect_pin)) {
1638                 if (gpio_request(slot->detect_pin, "mmc_detect")) {
1639                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
1640                         slot->detect_pin = -EBUSY;
1641                 } else if (gpio_get_value(slot->detect_pin) ^
1642                                 slot->detect_is_active_high) {
1643                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1644                 }
1645         }
1646
1647         if (!gpio_is_valid(slot->detect_pin))
1648                 mmc->caps |= MMC_CAP_NEEDS_POLL;
1649
1650         if (gpio_is_valid(slot->wp_pin)) {
1651                 if (gpio_request(slot->wp_pin, "mmc_wp")) {
1652                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
1653                         slot->wp_pin = -EBUSY;
1654                 }
1655         }
1656
1657         host->slot[id] = slot;
1658         mmc_add_host(mmc);
1659
1660         if (gpio_is_valid(slot->detect_pin)) {
1661                 int ret;
1662
1663                 setup_timer(&slot->detect_timer, atmci_detect_change,
1664                                 (unsigned long)slot);
1665
1666                 ret = request_irq(gpio_to_irq(slot->detect_pin),
1667                                 atmci_detect_interrupt,
1668                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
1669                                 "mmc-detect", slot);
1670                 if (ret) {
1671                         dev_dbg(&mmc->class_dev,
1672                                 "could not request IRQ %d for detect pin\n",
1673                                 gpio_to_irq(slot->detect_pin));
1674                         gpio_free(slot->detect_pin);
1675                         slot->detect_pin = -EBUSY;
1676                 }
1677         }
1678
1679         atmci_init_debugfs(slot);
1680
1681         return 0;
1682 }
1683
1684 static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
1685                 unsigned int id)
1686 {
1687         /* Debugfs stuff is cleaned up by mmc core */
1688
1689         set_bit(ATMCI_SHUTDOWN, &slot->flags);
1690         smp_wmb();
1691
1692         mmc_remove_host(slot->mmc);
1693
1694         if (gpio_is_valid(slot->detect_pin)) {
1695                 int pin = slot->detect_pin;
1696
1697                 free_irq(gpio_to_irq(pin), slot);
1698                 del_timer_sync(&slot->detect_timer);
1699                 gpio_free(pin);
1700         }
1701         if (gpio_is_valid(slot->wp_pin))
1702                 gpio_free(slot->wp_pin);
1703
1704         slot->host->slot[id] = NULL;
1705         mmc_free_host(slot->mmc);
1706 }
1707
1708 #ifdef CONFIG_MMC_ATMELMCI_DMA
1709 static bool atmci_filter(struct dma_chan *chan, void *slave)
1710 {
1711         struct mci_dma_data     *sl = slave;
1712
1713         if (sl && find_slave_dev(sl) == chan->device->dev) {
1714                 chan->private = slave_data_ptr(sl);
1715                 return true;
1716         } else {
1717                 return false;
1718         }
1719 }
1720
1721 static void atmci_configure_dma(struct atmel_mci *host)
1722 {
1723         struct mci_platform_data        *pdata;
1724
1725         if (host == NULL)
1726                 return;
1727
1728         pdata = host->pdev->dev.platform_data;
1729
1730         if (pdata && find_slave_dev(pdata->dma_slave)) {
1731                 dma_cap_mask_t mask;
1732
1733                 setup_dma_addr(pdata->dma_slave,
1734                                host->mapbase + ATMCI_TDR,
1735                                host->mapbase + ATMCI_RDR);
1736
1737                 /* Try to grab a DMA channel */
1738                 dma_cap_zero(mask);
1739                 dma_cap_set(DMA_SLAVE, mask);
1740                 host->dma.chan =
1741                         dma_request_channel(mask, atmci_filter, pdata->dma_slave);
1742         }
1743         if (!host->dma.chan)
1744                 dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
1745         else
1746                 dev_info(&host->pdev->dev,
1747                                         "Using %s for DMA transfers\n",
1748                                         dma_chan_name(host->dma.chan));
1749 }
1750 #else
1751 static void atmci_configure_dma(struct atmel_mci *host) {}
1752 #endif
1753
1754 static int __init atmci_probe(struct platform_device *pdev)
1755 {
1756         struct mci_platform_data        *pdata;
1757         struct atmel_mci                *host;
1758         struct resource                 *regs;
1759         unsigned int                    nr_slots;
1760         int                             irq;
1761         int                             ret;
1762
1763         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1764         if (!regs)
1765                 return -ENXIO;
1766         pdata = pdev->dev.platform_data;
1767         if (!pdata)
1768                 return -ENXIO;
1769         irq = platform_get_irq(pdev, 0);
1770         if (irq < 0)
1771                 return irq;
1772
1773         host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
1774         if (!host)
1775                 return -ENOMEM;
1776
1777         host->pdev = pdev;
1778         spin_lock_init(&host->lock);
1779         INIT_LIST_HEAD(&host->queue);
1780
1781         host->mck = clk_get(&pdev->dev, "mci_clk");
1782         if (IS_ERR(host->mck)) {
1783                 ret = PTR_ERR(host->mck);
1784                 goto err_clk_get;
1785         }
1786
1787         ret = -ENOMEM;
1788         host->regs = ioremap(regs->start, resource_size(regs));
1789         if (!host->regs)
1790                 goto err_ioremap;
1791
1792         clk_enable(host->mck);
1793         atmci_writel(host, CR, ATMCI_CR_SWRST);
1794         host->bus_hz = clk_get_rate(host->mck);
1795         clk_disable(host->mck);
1796
1797         host->mapbase = regs->start;
1798
1799         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
1800
1801         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
1802         if (ret)
1803                 goto err_request_irq;
1804
1805         atmci_configure_dma(host);
1806
1807         platform_set_drvdata(pdev, host);
1808
1809         /* We need at least one slot to succeed */
1810         nr_slots = 0;
1811         ret = -ENODEV;
1812         if (pdata->slot[0].bus_width) {
1813                 ret = atmci_init_slot(host, &pdata->slot[0],
1814                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
1815                 if (!ret)
1816                         nr_slots++;
1817         }
1818         if (pdata->slot[1].bus_width) {
1819                 ret = atmci_init_slot(host, &pdata->slot[1],
1820                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
1821                 if (!ret)
1822                         nr_slots++;
1823         }
1824
1825         if (!nr_slots) {
1826                 dev_err(&pdev->dev, "init failed: no slot defined\n");
1827                 goto err_init_slot;
1828         }
1829
1830         dev_info(&pdev->dev,
1831                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
1832                         host->mapbase, irq, nr_slots);
1833
1834         return 0;
1835
1836 err_init_slot:
1837 #ifdef CONFIG_MMC_ATMELMCI_DMA
1838         if (host->dma.chan)
1839                 dma_release_channel(host->dma.chan);
1840 #endif
1841         free_irq(irq, host);
1842 err_request_irq:
1843         iounmap(host->regs);
1844 err_ioremap:
1845         clk_put(host->mck);
1846 err_clk_get:
1847         kfree(host);
1848         return ret;
1849 }
1850
1851 static int __exit atmci_remove(struct platform_device *pdev)
1852 {
1853         struct atmel_mci        *host = platform_get_drvdata(pdev);
1854         unsigned int            i;
1855
1856         platform_set_drvdata(pdev, NULL);
1857
1858         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1859                 if (host->slot[i])
1860                         atmci_cleanup_slot(host->slot[i], i);
1861         }
1862
1863         clk_enable(host->mck);
1864         atmci_writel(host, IDR, ~0UL);
1865         atmci_writel(host, CR, ATMCI_CR_MCIDIS);
1866         atmci_readl(host, SR);
1867         clk_disable(host->mck);
1868
1869 #ifdef CONFIG_MMC_ATMELMCI_DMA
1870         if (host->dma.chan)
1871                 dma_release_channel(host->dma.chan);
1872 #endif
1873
1874         free_irq(platform_get_irq(pdev, 0), host);
1875         iounmap(host->regs);
1876
1877         clk_put(host->mck);
1878         kfree(host);
1879
1880         return 0;
1881 }
1882
1883 #ifdef CONFIG_PM
1884 static int atmci_suspend(struct device *dev)
1885 {
1886         struct atmel_mci *host = dev_get_drvdata(dev);
1887         int i;
1888
1889          for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1890                 struct atmel_mci_slot *slot = host->slot[i];
1891                 int ret;
1892
1893                 if (!slot)
1894                         continue;
1895                 ret = mmc_suspend_host(slot->mmc);
1896                 if (ret < 0) {
1897                         while (--i >= 0) {
1898                                 slot = host->slot[i];
1899                                 if (slot
1900                                 && test_bit(ATMCI_SUSPENDED, &slot->flags)) {
1901                                         mmc_resume_host(host->slot[i]->mmc);
1902                                         clear_bit(ATMCI_SUSPENDED, &slot->flags);
1903                                 }
1904                         }
1905                         return ret;
1906                 } else {
1907                         set_bit(ATMCI_SUSPENDED, &slot->flags);
1908                 }
1909         }
1910
1911         return 0;
1912 }
1913
1914 static int atmci_resume(struct device *dev)
1915 {
1916         struct atmel_mci *host = dev_get_drvdata(dev);
1917         int i;
1918         int ret = 0;
1919
1920         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1921                 struct atmel_mci_slot *slot = host->slot[i];
1922                 int err;
1923
1924                 slot = host->slot[i];
1925                 if (!slot)
1926                         continue;
1927                 if (!test_bit(ATMCI_SUSPENDED, &slot->flags))
1928                         continue;
1929                 err = mmc_resume_host(slot->mmc);
1930                 if (err < 0)
1931                         ret = err;
1932                 else
1933                         clear_bit(ATMCI_SUSPENDED, &slot->flags);
1934         }
1935
1936         return ret;
1937 }
1938 static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume);
1939 #define ATMCI_PM_OPS    (&atmci_pm)
1940 #else
1941 #define ATMCI_PM_OPS    NULL
1942 #endif
1943
1944 static struct platform_driver atmci_driver = {
1945         .remove         = __exit_p(atmci_remove),
1946         .driver         = {
1947                 .name           = "atmel_mci",
1948                 .pm             = ATMCI_PM_OPS,
1949         },
1950 };
1951
1952 static int __init atmci_init(void)
1953 {
1954         return platform_driver_probe(&atmci_driver, atmci_probe);
1955 }
1956
1957 static void __exit atmci_exit(void)
1958 {
1959         platform_driver_unregister(&atmci_driver);
1960 }
1961
1962 late_initcall(atmci_init); /* try to load after dma driver when built-in */
1963 module_exit(atmci_exit);
1964
1965 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
1966 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1967 MODULE_LICENSE("GPL v2");