SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/err.h>
  15 #include <linux/gpio.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/ioport.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/stat.h>
  24
  25 #include <linux/mmc/host.h>
  26
  27 #include <asm/atmel-mci.h>
  28 #include <asm/io.h>
  29 #include <asm/unaligned.h>
  30
  31 #include <mach/board.h>
  32
  33 #include "atmel-mci-regs.h"
  34
  35 #define ATMCI_DATA_ERROR_FLAGS  (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE)
  36
  37 enum {
  38         EVENT_CMD_COMPLETE = 0,
  39         EVENT_XFER_COMPLETE,
  40         EVENT_DATA_COMPLETE,
  41         EVENT_DATA_ERROR,
  42 };
  43
  44 enum atmel_mci_state {
  45         STATE_IDLE = 0,
  46         STATE_SENDING_CMD,
  47         STATE_SENDING_DATA,
  48         STATE_DATA_BUSY,
  49         STATE_SENDING_STOP,
  50         STATE_DATA_ERROR,
  51 };
  52
  53 /**
  54  * struct atmel_mci - MMC controller state shared between all slots
  55  * @lock: Spinlock protecting the queue and associated data.
  56  * @regs: Pointer to MMIO registers.
  57  * @sg: Scatterlist entry currently being processed by PIO code, if any.
  58  * @pio_offset: Offset into the current scatterlist entry.
  59  * @cur_slot: The slot which is currently using the controller.
  60  * @mrq: The request currently being processed on @cur_slot,
  61  *      or NULL if the controller is idle.
  62  * @cmd: The command currently being sent to the card, or NULL.
  63  * @data: The data currently being transferred, or NULL if no data
  64  *      transfer is in progress.
  65  * @cmd_status: Snapshot of SR taken upon completion of the current
  66  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
  67  * @data_status: Snapshot of SR taken upon completion of the current
  68  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
  69  *      EVENT_DATA_ERROR is pending.
  70  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
  71  *      to be sent.
  72  * @tasklet: Tasklet running the request state machine.
  73  * @pending_events: Bitmask of events flagged by the interrupt handler
  74  *      to be processed by the tasklet.
  75  * @completed_events: Bitmask of events which the state machine has
  76  *      processed.
  77  * @state: Tasklet state.
  78  * @queue: List of slots waiting for access to the controller.
  79  * @need_clock_update: Update the clock rate before the next request.
  80  * @need_reset: Reset controller before next request.
  81  * @mode_reg: Value of the MR register.
  82  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
  83  *      rate and timeout calculations.
  84  * @mapbase: Physical address of the MMIO registers.
  85  * @mck: The peripheral bus clock hooked up to the MMC controller.
  86  * @pdev: Platform device associated with the MMC controller.
  87  * @slot: Slots sharing this MMC controller.
  88  *
  89  * Locking
  90  * =======
  91  *
  92  * @lock is a softirq-safe spinlock protecting @queue as well as
  93  * @cur_slot, @mrq and @state. These must always be updated
  94  * at the same time while holding @lock.
  95  *
  96  * @lock also protects mode_reg and need_clock_update since these are
  97  * used to synchronize mode register updates with the queue
  98  * processing.
  99  *
 100  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
 101  * and must always be written at the same time as the slot is added to
 102  * @queue.
 103  *
 104  * @pending_events and @completed_events are accessed using atomic bit
 105  * operations, so they don't need any locking.
 106  *
 107  * None of the fields touched by the interrupt handler need any
 108  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 109  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 110  * interrupts must be disabled and @data_status updated with a
 111  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 112  * CMDRDY interupt must be disabled and @cmd_status updated with a
 113  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 114  * bytes_xfered field of @data must be written. This is ensured by
 115  * using barriers.
 116  */
 117 struct atmel_mci {
 118         spinlock_t              lock;
 119         void __iomem            *regs;
 120
 121         struct scatterlist      *sg;
 122         unsigned int            pio_offset;
 123
 124         struct atmel_mci_slot   *cur_slot;
 125         struct mmc_request      *mrq;
 126         struct mmc_command      *cmd;
 127         struct mmc_data         *data;
 128
 129         u32                     cmd_status;
 130         u32                     data_status;
 131         u32                     stop_cmdr;
 132
 133         struct tasklet_struct   tasklet;
 134         unsigned long           pending_events;
 135         unsigned long           completed_events;
 136         enum atmel_mci_state    state;
 137         struct list_head        queue;
 138
 139         bool                    need_clock_update;
 140         bool                    need_reset;
 141         u32                     mode_reg;
 142         unsigned long           bus_hz;
 143         unsigned long           mapbase;
 144         struct clk              *mck;
 145         struct platform_device  *pdev;
 146
 147         struct atmel_mci_slot   *slot[ATMEL_MCI_MAX_NR_SLOTS];
 148 };
 149
 150 /**
 151  * struct atmel_mci_slot - MMC slot state
 152  * @mmc: The mmc_host representing this slot.
 153  * @host: The MMC controller this slot is using.
 154  * @sdc_reg: Value of SDCR to be written before using this slot.
 155  * @mrq: mmc_request currently being processed or waiting to be
 156  *      processed, or NULL when the slot is idle.
 157  * @queue_node: List node for placing this node in the @queue list of
 158  *      &struct atmel_mci.
 159  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
 160  * @flags: Random state bits associated with the slot.
 161  * @detect_pin: GPIO pin used for card detection, or negative if not
 162  *      available.
 163  * @wp_pin: GPIO pin used for card write protect sending, or negative
 164  *      if not available.
 165  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
 166  */
 167 struct atmel_mci_slot {
 168         struct mmc_host         *mmc;
 169         struct atmel_mci        *host;
 170
 171         u32                     sdc_reg;
 172
 173         struct mmc_request      *mrq;
 174         struct list_head        queue_node;
 175
 176         unsigned int            clock;
 177         unsigned long           flags;
 178 #define ATMCI_CARD_PRESENT      0
 179 #define ATMCI_CARD_NEED_INIT    1
 180 #define ATMCI_SHUTDOWN          2
 181
 182         int                     detect_pin;
 183         int                     wp_pin;
 184
 185         struct timer_list       detect_timer;
 186 };
 187
 188 #define atmci_test_and_clear_pending(host, event)               \
 189         test_and_clear_bit(event, &host->pending_events)
 190 #define atmci_set_completed(host, event)                        \
 191         set_bit(event, &host->completed_events)
 192 #define atmci_set_pending(host, event)                          \
 193         set_bit(event, &host->pending_events)
 194
 195 /*
 196  * The debugfs stuff below is mostly optimized away when
 197  * CONFIG_DEBUG_FS is not set.
 198  */
 199 static int atmci_req_show(struct seq_file *s, void *v)
 200 {
 201         struct atmel_mci_slot   *slot = s->private;
 202         struct mmc_request      *mrq;
 203         struct mmc_command      *cmd;
 204         struct mmc_command      *stop;
 205         struct mmc_data         *data;
 206
 207         /* Make sure we get a consistent snapshot */
 208         spin_lock_bh(&slot->host->lock);
 209         mrq = slot->mrq;
 210
 211         if (mrq) {
 212                 cmd = mrq->cmd;
 213                 data = mrq->data;
 214                 stop = mrq->stop;
 215
 216                 if (cmd)
 217                         seq_printf(s,
 218                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 219                                 cmd->opcode, cmd->arg, cmd->flags,
 220                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
 221                                 cmd->resp[2], cmd->error);
 222                 if (data)
 223                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
 224                                 data->bytes_xfered, data->blocks,
 225                                 data->blksz, data->flags, data->error);
 226                 if (stop)
 227                         seq_printf(s,
 228                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
 229                                 stop->opcode, stop->arg, stop->flags,
 230                                 stop->resp[0], stop->resp[1], stop->resp[2],
 231                                 stop->resp[2], stop->error);
 232         }
 233
 234         spin_unlock_bh(&slot->host->lock);
 235
 236         return 0;
 237 }
 238
 239 static int atmci_req_open(struct inode *inode, struct file *file)
 240 {
 241         return single_open(file, atmci_req_show, inode->i_private);
 242 }
 243
 244 static const struct file_operations atmci_req_fops = {
 245         .owner          = THIS_MODULE,
 246         .open           = atmci_req_open,
 247         .read           = seq_read,
 248         .llseek         = seq_lseek,
 249         .release        = single_release,
 250 };
 251
 252 static void atmci_show_status_reg(struct seq_file *s,
 253                 const char *regname, u32 value)
 254 {
 255         static const char       *sr_bit[] = {
 256                 [0]     = "CMDRDY",
 257                 [1]     = "RXRDY",
 258                 [2]     = "TXRDY",
 259                 [3]     = "BLKE",
 260                 [4]     = "DTIP",
 261                 [5]     = "NOTBUSY",
 262                 [8]     = "SDIOIRQA",
 263                 [9]     = "SDIOIRQB",
 264                 [16]    = "RINDE",
 265                 [17]    = "RDIRE",
 266                 [18]    = "RCRCE",
 267                 [19]    = "RENDE",
 268                 [20]    = "RTOE",
 269                 [21]    = "DCRCE",
 270                 [22]    = "DTOE",
 271                 [30]    = "OVRE",
 272                 [31]    = "UNRE",
 273         };
 274         unsigned int            i;
 275
 276         seq_printf(s, "%s:\t0x%08x", regname, value);
 277         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
 278                 if (value & (1 << i)) {
 279                         if (sr_bit[i])
 280                                 seq_printf(s, " %s", sr_bit[i]);
 281                         else
 282                                 seq_puts(s, " UNKNOWN");
 283                 }
 284         }
 285         seq_putc(s, '\n');
 286 }
 287
 288 static int atmci_regs_show(struct seq_file *s, void *v)
 289 {
 290         struct atmel_mci        *host = s->private;
 291         u32                     *buf;
 292
 293         buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL);
 294         if (!buf)
 295                 return -ENOMEM;
 296
 297         /*
 298          * Grab a more or less consistent snapshot. Note that we're
 299          * not disabling interrupts, so IMR and SR may not be
 300          * consistent.
 301          */
 302         spin_lock_bh(&host->lock);
 303         clk_enable(host->mck);
 304         memcpy_fromio(buf, host->regs, MCI_REGS_SIZE);
 305         clk_disable(host->mck);
 306         spin_unlock_bh(&host->lock);
 307
 308         seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
 309                         buf[MCI_MR / 4],
 310                         buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "",
 311                         buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "",
 312                         buf[MCI_MR / 4] & 0xff);
 313         seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]);
 314         seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]);
 315         seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]);
 316         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
 317                         buf[MCI_BLKR / 4],
 318                         buf[MCI_BLKR / 4] & 0xffff,
 319                         (buf[MCI_BLKR / 4] >> 16) & 0xffff);
 320
 321         /* Don't read RSPR and RDR; it will consume the data there */
 322
 323         atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]);
 324         atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]);
 325
 326         kfree(buf);
 327
 328         return 0;
 329 }
 330
 331 static int atmci_regs_open(struct inode *inode, struct file *file)
 332 {
 333         return single_open(file, atmci_regs_show, inode->i_private);
 334 }
 335
 336 static const struct file_operations atmci_regs_fops = {
 337         .owner          = THIS_MODULE,
 338         .open           = atmci_regs_open,
 339         .read           = seq_read,
 340         .llseek         = seq_lseek,
 341         .release        = single_release,
 342 };
 343
 344 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
 345 {
 346         struct mmc_host         *mmc = slot->mmc;
 347         struct atmel_mci        *host = slot->host;
 348         struct dentry           *root;
 349         struct dentry           *node;
 350
 351         root = mmc->debugfs_root;
 352         if (!root)
 353                 return;
 354
 355         node = debugfs_create_file("regs", S_IRUSR, root, host,
 356                         &atmci_regs_fops);
 357         if (IS_ERR(node))
 358                 return;
 359         if (!node)
 360                 goto err;
 361
 362         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
 363         if (!node)
 364                 goto err;
 365
 366         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
 367         if (!node)
 368                 goto err;
 369
 370         node = debugfs_create_x32("pending_events", S_IRUSR, root,
 371                                      (u32 *)&host->pending_events);
 372         if (!node)
 373                 goto err;
 374
 375         node = debugfs_create_x32("completed_events", S_IRUSR, root,
 376                                      (u32 *)&host->completed_events);
 377         if (!node)
 378                 goto err;
 379
 380         return;
 381
 382 err:
 383         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
 384 }
 385
 386 static inline unsigned int ns_to_clocks(struct atmel_mci *host,
 387                                         unsigned int ns)
 388 {
 389         return (ns * (host->bus_hz / 1000000) + 999) / 1000;
 390 }
 391
 392 static void atmci_set_timeout(struct atmel_mci *host,
 393                 struct atmel_mci_slot *slot, struct mmc_data *data)
 394 {
 395         static unsigned dtomul_to_shift[] = {
 396                 0, 4, 7, 8, 10, 12, 16, 20
 397         };
 398         unsigned        timeout;
 399         unsigned        dtocyc;
 400         unsigned        dtomul;
 401
 402         timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks;
 403
 404         for (dtomul = 0; dtomul < 8; dtomul++) {
 405                 unsigned shift = dtomul_to_shift[dtomul];
 406                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
 407                 if (dtocyc < 15)
 408                         break;
 409         }
 410
 411         if (dtomul >= 8) {
 412                 dtomul = 7;
 413                 dtocyc = 15;
 414         }
 415
 416         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
 417                         dtocyc << dtomul_to_shift[dtomul]);
 418         mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc)));
 419 }
 420
 421 /*
 422  * Return mask with command flags to be enabled for this command.
 423  */
 424 static u32 atmci_prepare_command(struct mmc_host *mmc,
 425                                  struct mmc_command *cmd)
 426 {
 427         struct mmc_data *data;
 428         u32             cmdr;
 429
 430         cmd->error = -EINPROGRESS;
 431
 432         cmdr = MCI_CMDR_CMDNB(cmd->opcode);
 433
 434         if (cmd->flags & MMC_RSP_PRESENT) {
 435                 if (cmd->flags & MMC_RSP_136)
 436                         cmdr |= MCI_CMDR_RSPTYP_136BIT;
 437                 else
 438                         cmdr |= MCI_CMDR_RSPTYP_48BIT;
 439         }
 440
 441         /*
 442          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
 443          * it's too difficult to determine whether this is an ACMD or
 444          * not. Better make it 64.
 445          */
 446         cmdr |= MCI_CMDR_MAXLAT_64CYC;
 447
 448         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
 449                 cmdr |= MCI_CMDR_OPDCMD;
 450
 451         data = cmd->data;
 452         if (data) {
 453                 cmdr |= MCI_CMDR_START_XFER;
 454                 if (data->flags & MMC_DATA_STREAM)
 455                         cmdr |= MCI_CMDR_STREAM;
 456                 else if (data->blocks > 1)
 457                         cmdr |= MCI_CMDR_MULTI_BLOCK;
 458                 else
 459                         cmdr |= MCI_CMDR_BLOCK;
 460
 461                 if (data->flags & MMC_DATA_READ)
 462                         cmdr |= MCI_CMDR_TRDIR_READ;
 463         }
 464
 465         return cmdr;
 466 }
 467
 468 static void atmci_start_command(struct atmel_mci *host,
 469                 struct mmc_command *cmd, u32 cmd_flags)
 470 {
 471         WARN_ON(host->cmd);
 472         host->cmd = cmd;
 473
 474         dev_vdbg(&host->pdev->dev,
 475                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
 476                         cmd->arg, cmd_flags);
 477
 478         mci_writel(host, ARGR, cmd->arg);
 479         mci_writel(host, CMDR, cmd_flags);
 480 }
 481
 482 static void send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
 483 {
 484         atmci_start_command(host, data->stop, host->stop_cmdr);
 485         mci_writel(host, IER, MCI_CMDRDY);
 486 }
 487
 488 /*
 489  * Returns a mask of interrupt flags to be enabled after the whole
 490  * request has been prepared.
 491  */
 492 static u32 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
 493 {
 494         u32 iflags;
 495
 496         data->error = -EINPROGRESS;
 497
 498         WARN_ON(host->data);
 499         host->sg = NULL;
 500         host->data = data;
 501
 502         iflags = ATMCI_DATA_ERROR_FLAGS;
 503
 504         /*
 505          * Errata: MMC data write operation with less than 12
 506          * bytes is impossible.
 507          *
 508          * Errata: MCI Transmit Data Register (TDR) FIFO
 509          * corruption when length is not multiple of 4.
 510          */
 511         if (data->blocks * data->blksz < 12
 512                         || (data->blocks * data->blksz) & 3)
 513                 host->need_reset = true;
 514
 515         host->sg = data->sg;
 516         host->pio_offset = 0;
 517         if (data->flags & MMC_DATA_READ)
 518                 iflags |= MCI_RXRDY;
 519         else
 520                 iflags |= MCI_TXRDY;
 521
 522         return iflags;
 523 }
 524
 525 static void atmci_start_request(struct atmel_mci *host,
 526                 struct atmel_mci_slot *slot)
 527 {
 528         struct mmc_request      *mrq;
 529         struct mmc_command      *cmd;
 530         struct mmc_data         *data;
 531         u32                     iflags;
 532         u32                     cmdflags;
 533
 534         mrq = slot->mrq;
 535         host->cur_slot = slot;
 536         host->mrq = mrq;
 537
 538         host->pending_events = 0;
 539         host->completed_events = 0;
 540
 541         if (host->need_reset) {
 542                 mci_writel(host, CR, MCI_CR_SWRST);
 543                 mci_writel(host, CR, MCI_CR_MCIEN);
 544                 mci_writel(host, MR, host->mode_reg);
 545                 host->need_reset = false;
 546         }
 547         mci_writel(host, SDCR, slot->sdc_reg);
 548
 549         iflags = mci_readl(host, IMR);
 550         if (iflags)
 551                 dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
 552                                 iflags);
 553
 554         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
 555                 /* Send init sequence (74 clock cycles) */
 556                 mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT);
 557                 while (!(mci_readl(host, SR) & MCI_CMDRDY))
 558                         cpu_relax();
 559         }
 560         data = mrq->data;
 561         if (data) {
 562                 atmci_set_timeout(host, slot, data);
 563
 564                 /* Must set block count/size before sending command */
 565                 mci_writel(host, BLKR, MCI_BCNT(data->blocks)
 566                                 | MCI_BLKLEN(data->blksz));
 567                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
 568                         MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz));
 569         }
 570
 571         iflags = MCI_CMDRDY;
 572         cmd = mrq->cmd;
 573         cmdflags = atmci_prepare_command(slot->mmc, cmd);
 574         atmci_start_command(host, cmd, cmdflags);
 575
 576         if (data)
 577                 iflags |= atmci_submit_data(host, data);
 578
 579         if (mrq->stop) {
 580                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
 581                 host->stop_cmdr |= MCI_CMDR_STOP_XFER;
 582                 if (!(data->flags & MMC_DATA_WRITE))
 583                         host->stop_cmdr |= MCI_CMDR_TRDIR_READ;
 584                 if (data->flags & MMC_DATA_STREAM)
 585                         host->stop_cmdr |= MCI_CMDR_STREAM;
 586                 else
 587                         host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK;
 588         }
 589
 590         /*
 591          * We could have enabled interrupts earlier, but I suspect
 592          * that would open up a nice can of interesting race
 593          * conditions (e.g. command and data complete, but stop not
 594          * prepared yet.)
 595          */
 596         mci_writel(host, IER, iflags);
 597 }
 598
 599 static void atmci_queue_request(struct atmel_mci *host,
 600                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
 601 {
 602         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
 603                         host->state);
 604
 605         spin_lock_bh(&host->lock);
 606         slot->mrq = mrq;
 607         if (host->state == STATE_IDLE) {
 608                 host->state = STATE_SENDING_CMD;
 609                 atmci_start_request(host, slot);
 610         } else {
 611                 list_add_tail(&slot->queue_node, &host->queue);
 612         }
 613         spin_unlock_bh(&host->lock);
 614 }
 615
 616 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 617 {
 618         struct atmel_mci_slot   *slot = mmc_priv(mmc);
 619         struct atmel_mci        *host = slot->host;
 620         struct mmc_data         *data;
 621
 622         WARN_ON(slot->mrq);
 623
 624         /*
 625          * We may "know" the card is gone even though there's still an
 626          * electrical connection. If so, we really need to communicate
 627          * this to the MMC core since there won't be any more
 628          * interrupts as the card is completely removed. Otherwise,
 629          * the MMC core might believe the card is still there even
 630          * though the card was just removed very slowly.
 631          */
 632         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
 633                 mrq->cmd->error = -ENOMEDIUM;
 634                 mmc_request_done(mmc, mrq);
 635                 return;
 636         }
 637
 638         /* We don't support multiple blocks of weird lengths. */
 639         data = mrq->data;
 640         if (data && data->blocks > 1 && data->blksz & 3) {
 641                 mrq->cmd->error = -EINVAL;
 642                 mmc_request_done(mmc, mrq);
 643         }
 644
 645         atmci_queue_request(host, slot, mrq);
 646 }
 647
 648 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 649 {
 650         struct atmel_mci_slot   *slot = mmc_priv(mmc);
 651         struct atmel_mci        *host = slot->host;
 652         unsigned int            i;
 653
 654         slot->sdc_reg &= ~MCI_SDCBUS_MASK;
 655         switch (ios->bus_width) {
 656         case MMC_BUS_WIDTH_1:
 657                 slot->sdc_reg |= MCI_SDCBUS_1BIT;
 658                 break;
 659         case MMC_BUS_WIDTH_4:
 660                 slot->sdc_reg = MCI_SDCBUS_4BIT;
 661                 break;
 662         }
 663
 664         if (ios->clock) {
 665                 unsigned int clock_min = ~0U;
 666                 u32 clkdiv;
 667
 668                 spin_lock_bh(&host->lock);
 669                 if (!host->mode_reg) {
 670                         clk_enable(host->mck);
 671                         mci_writel(host, CR, MCI_CR_SWRST);
 672                         mci_writel(host, CR, MCI_CR_MCIEN);
 673                 }
 674
 675                 /*
 676                  * Use mirror of ios->clock to prevent race with mmc
 677                  * core ios update when finding the minimum.
 678                  */
 679                 slot->clock = ios->clock;
 680                 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
 681                         if (host->slot[i] && host->slot[i]->clock
 682                                         && host->slot[i]->clock < clock_min)
 683                                 clock_min = host->slot[i]->clock;
 684                 }
 685
 686                 /* Calculate clock divider */
 687                 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
 688                 if (clkdiv > 255) {
 689                         dev_warn(&mmc->class_dev,
 690                                 "clock %u too slow; using %lu\n",
 691                                 clock_min, host->bus_hz / (2 * 256));
 692                         clkdiv = 255;
 693                 }
 694
 695                 /*
 696                  * WRPROOF and RDPROOF prevent overruns/underruns by
 697                  * stopping the clock when the FIFO is full/empty.
 698                  * This state is not expected to last for long.
 699                  */
 700                 host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF
 701                                         | MCI_MR_RDPROOF;
 702
 703                 if (list_empty(&host->queue))
 704                         mci_writel(host, MR, host->mode_reg);
 705                 else
 706                         host->need_clock_update = true;
 707
 708                 spin_unlock_bh(&host->lock);
 709         } else {
 710                 bool any_slot_active = false;
 711
 712                 spin_lock_bh(&host->lock);
 713                 slot->clock = 0;
 714                 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
 715                         if (host->slot[i] && host->slot[i]->clock) {
 716                                 any_slot_active = true;
 717                                 break;
 718                         }
 719                 }
 720                 if (!any_slot_active) {
 721                         mci_writel(host, CR, MCI_CR_MCIDIS);
 722                         if (host->mode_reg) {
 723                                 mci_readl(host, MR);
 724                                 clk_disable(host->mck);
 725                         }
 726                         host->mode_reg = 0;
 727                 }
 728                 spin_unlock_bh(&host->lock);
 729         }
 730
 731         switch (ios->power_mode) {
 732         case MMC_POWER_UP:
 733                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
 734                 break;
 735         default:
 736                 /*
 737                  * TODO: None of the currently available AVR32-based
 738                  * boards allow MMC power to be turned off. Implement
 739                  * power control when this can be tested properly.
 740                  *
 741                  * We also need to hook this into the clock management
 742                  * somehow so that newly inserted cards aren't
 743                  * subjected to a fast clock before we have a chance
 744                  * to figure out what the maximum rate is. Currently,
 745                  * there's no way to avoid this, and there never will
 746                  * be for boards that don't support power control.
 747                  */
 748                 break;
 749         }
 750 }
 751
 752 static int atmci_get_ro(struct mmc_host *mmc)
 753 {
 754         int                     read_only = -ENOSYS;
 755         struct atmel_mci_slot   *slot = mmc_priv(mmc);
 756
 757         if (gpio_is_valid(slot->wp_pin)) {
 758                 read_only = gpio_get_value(slot->wp_pin);
 759                 dev_dbg(&mmc->class_dev, "card is %s\n",
 760                                 read_only ? "read-only" : "read-write");
 761         }
 762
 763         return read_only;
 764 }
 765
 766 static int atmci_get_cd(struct mmc_host *mmc)
 767 {
 768         int                     present = -ENOSYS;
 769         struct atmel_mci_slot   *slot = mmc_priv(mmc);
 770
 771         if (gpio_is_valid(slot->detect_pin)) {
 772                 present = !gpio_get_value(slot->detect_pin);
 773                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
 774                                 present ? "" : "not ");
 775         }
 776
 777         return present;
 778 }
 779
 780 static const struct mmc_host_ops atmci_ops = {
 781         .request        = atmci_request,
 782         .set_ios        = atmci_set_ios,
 783         .get_ro         = atmci_get_ro,
 784         .get_cd         = atmci_get_cd,
 785 };
 786
 787 /* Called with host->lock held */
 788 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
 789         __releases(&host->lock)
 790         __acquires(&host->lock)
 791 {
 792         struct atmel_mci_slot   *slot = NULL;
 793         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
 794
 795         WARN_ON(host->cmd || host->data);
 796
 797         /*
 798          * Update the MMC clock rate if necessary. This may be
 799          * necessary if set_ios() is called when a different slot is
 800          * busy transfering data.
 801          */
 802         if (host->need_clock_update)
 803                 mci_writel(host, MR, host->mode_reg);
 804
 805         host->cur_slot->mrq = NULL;
 806         host->mrq = NULL;
 807         if (!list_empty(&host->queue)) {
 808                 slot = list_entry(host->queue.next,
 809                                 struct atmel_mci_slot, queue_node);
 810                 list_del(&slot->queue_node);
 811                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
 812                                 mmc_hostname(slot->mmc));
 813                 host->state = STATE_SENDING_CMD;
 814                 atmci_start_request(host, slot);
 815         } else {
 816                 dev_vdbg(&host->pdev->dev, "list empty\n");
 817                 host->state = STATE_IDLE;
 818         }
 819
 820         spin_unlock(&host->lock);
 821         mmc_request_done(prev_mmc, mrq);
 822         spin_lock(&host->lock);
 823 }
 824
 825 static void atmci_command_complete(struct atmel_mci *host,
 826                         struct mmc_command *cmd)
 827 {
 828         u32             status = host->cmd_status;
 829
 830         /* Read the response from the card (up to 16 bytes) */
 831         cmd->resp[0] = mci_readl(host, RSPR);
 832         cmd->resp[1] = mci_readl(host, RSPR);
 833         cmd->resp[2] = mci_readl(host, RSPR);
 834         cmd->resp[3] = mci_readl(host, RSPR);
 835
 836         if (status & MCI_RTOE)
 837                 cmd->error = -ETIMEDOUT;
 838         else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE))
 839                 cmd->error = -EILSEQ;
 840         else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE))
 841                 cmd->error = -EIO;
 842         else
 843                 cmd->error = 0;
 844
 845         if (cmd->error) {
 846                 dev_dbg(&host->pdev->dev,
 847                         "command error: status=0x%08x\n", status);
 848
 849                 if (cmd->data) {
 850                         host->data = NULL;
 851                         mci_writel(host, IDR, MCI_NOTBUSY
 852                                         | MCI_TXRDY | MCI_RXRDY
 853                                         | ATMCI_DATA_ERROR_FLAGS);
 854                 }
 855         }
 856 }
 857
 858 static void atmci_detect_change(unsigned long data)
 859 {
 860         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
 861         bool                    present;
 862         bool                    present_old;
 863
 864         /*
 865          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
 866          * freeing the interrupt. We must not re-enable the interrupt
 867          * if it has been freed, and if we're shutting down, it
 868          * doesn't really matter whether the card is present or not.
 869          */
 870         smp_rmb();
 871         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
 872                 return;
 873
 874         enable_irq(gpio_to_irq(slot->detect_pin));
 875         present = !gpio_get_value(slot->detect_pin);
 876         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
 877
 878         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
 879                         present, present_old);
 880
 881         if (present != present_old) {
 882                 struct atmel_mci        *host = slot->host;
 883                 struct mmc_request      *mrq;
 884
 885                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
 886                         present ? "inserted" : "removed");
 887
 888                 spin_lock(&host->lock);
 889
 890                 if (!present)
 891                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
 892                 else
 893                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
 894
 895                 /* Clean up queue if present */
 896                 mrq = slot->mrq;
 897                 if (mrq) {
 898                         if (mrq == host->mrq) {
 899                                 /*
 900                                  * Reset controller to terminate any ongoing
 901                                  * commands or data transfers.
 902                                  */
 903                                 mci_writel(host, CR, MCI_CR_SWRST);
 904                                 mci_writel(host, CR, MCI_CR_MCIEN);
 905                                 mci_writel(host, MR, host->mode_reg);
 906
 907                                 host->data = NULL;
 908                                 host->cmd = NULL;
 909
 910                                 switch (host->state) {
 911                                 case STATE_IDLE:
 912                                         break;
 913                                 case STATE_SENDING_CMD:
 914                                         mrq->cmd->error = -ENOMEDIUM;
 915                                         if (!mrq->data)
 916                                                 break;
 917                                         /* fall through */
 918                                 case STATE_SENDING_DATA:
 919                                         mrq->data->error = -ENOMEDIUM;
 920                                         break;
 921                                 case STATE_DATA_BUSY:
 922                                 case STATE_DATA_ERROR:
 923                                         if (mrq->data->error == -EINPROGRESS)
 924                                                 mrq->data->error = -ENOMEDIUM;
 925                                         if (!mrq->stop)
 926                                                 break;
 927                                         /* fall through */
 928                                 case STATE_SENDING_STOP:
 929                                         mrq->stop->error = -ENOMEDIUM;
 930                                         break;
 931                                 }
 932
 933                                 atmci_request_end(host, mrq);
 934                         } else {
 935                                 list_del(&slot->queue_node);
 936                                 mrq->cmd->error = -ENOMEDIUM;
 937                                 if (mrq->data)
 938                                         mrq->data->error = -ENOMEDIUM;
 939                                 if (mrq->stop)
 940                                         mrq->stop->error = -ENOMEDIUM;
 941
 942                                 spin_unlock(&host->lock);
 943                                 mmc_request_done(slot->mmc, mrq);
 944                                 spin_lock(&host->lock);
 945                         }
 946                 }
 947                 spin_unlock(&host->lock);
 948
 949                 mmc_detect_change(slot->mmc, 0);
 950         }
 951 }
 952
 953 static void atmci_tasklet_func(unsigned long priv)
 954 {
 955         struct atmel_mci        *host = (struct atmel_mci *)priv;
 956         struct mmc_request      *mrq = host->mrq;
 957         struct mmc_data         *data = host->data;
 958         struct mmc_command      *cmd = host->cmd;
 959         enum atmel_mci_state    state = host->state;
 960         enum atmel_mci_state    prev_state;
 961         u32                     status;
 962
 963         spin_lock(&host->lock);
 964
 965         state = host->state;
 966
 967         dev_vdbg(&host->pdev->dev,
 968                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
 969                 state, host->pending_events, host->completed_events,
 970                 mci_readl(host, IMR));
 971
 972         do {
 973                 prev_state = state;
 974
 975                 switch (state) {
 976                 case STATE_IDLE:
 977                         break;
 978
 979                 case STATE_SENDING_CMD:
 980                         if (!atmci_test_and_clear_pending(host,
 981                                                 EVENT_CMD_COMPLETE))
 982                                 break;
 983
 984                         host->cmd = NULL;
 985                         atmci_set_completed(host, EVENT_CMD_COMPLETE);
 986                         atmci_command_complete(host, mrq->cmd);
 987                         if (!mrq->data || cmd->error) {
 988                                 atmci_request_end(host, host->mrq);
 989                                 goto unlock;
 990                         }
 991
 992                         prev_state = state = STATE_SENDING_DATA;
 993                         /* fall through */
 994
 995                 case STATE_SENDING_DATA:
 996                         if (atmci_test_and_clear_pending(host,
 997                                                 EVENT_DATA_ERROR)) {
 998                                 if (data->stop)
 999                                         send_stop_cmd(host, data);
1000                                 state = STATE_DATA_ERROR;
1001                                 break;
1002                         }
1003
1004                         if (!atmci_test_and_clear_pending(host,
1005                                                 EVENT_XFER_COMPLETE))
1006                                 break;
1007
1008                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1009                         prev_state = state = STATE_DATA_BUSY;
1010                         /* fall through */
1011
1012                 case STATE_DATA_BUSY:
1013                         if (!atmci_test_and_clear_pending(host,
1014                                                 EVENT_DATA_COMPLETE))
1015                                 break;
1016
1017                         host->data = NULL;
1018                         atmci_set_completed(host, EVENT_DATA_COMPLETE);
1019                         status = host->data_status;
1020                         if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) {
1021                                 if (status & MCI_DTOE) {
1022                                         dev_dbg(&host->pdev->dev,
1023                                                         "data timeout error\n");
1024                                         data->error = -ETIMEDOUT;
1025                                 } else if (status & MCI_DCRCE) {
1026                                         dev_dbg(&host->pdev->dev,
1027                                                         "data CRC error\n");
1028                                         data->error = -EILSEQ;
1029                                 } else {
1030                                         dev_dbg(&host->pdev->dev,
1031                                                 "data FIFO error (status=%08x)\n",
1032                                                 status);
1033                                         data->error = -EIO;
1034                                 }
1035                         } else {
1036                                 data->bytes_xfered = data->blocks * data->blksz;
1037                                 data->error = 0;
1038                         }
1039
1040                         if (!data->stop) {
1041                                 atmci_request_end(host, host->mrq);
1042                                 goto unlock;
1043                         }
1044
1045                         prev_state = state = STATE_SENDING_STOP;
1046                         if (!data->error)
1047                                 send_stop_cmd(host, data);
1048                         /* fall through */
1049
1050                 case STATE_SENDING_STOP:
1051                         if (!atmci_test_and_clear_pending(host,
1052                                                 EVENT_CMD_COMPLETE))
1053                                 break;
1054
1055                         host->cmd = NULL;
1056                         atmci_command_complete(host, mrq->stop);
1057                         atmci_request_end(host, host->mrq);
1058                         goto unlock;
1059
1060                 case STATE_DATA_ERROR:
1061                         if (!atmci_test_and_clear_pending(host,
1062                                                 EVENT_XFER_COMPLETE))
1063                                 break;
1064
1065                         state = STATE_DATA_BUSY;
1066                         break;
1067                 }
1068         } while (state != prev_state);
1069
1070         host->state = state;
1071
1072 unlock:
1073         spin_unlock(&host->lock);
1074 }
1075
1076 static void atmci_read_data_pio(struct atmel_mci *host)
1077 {
1078         struct scatterlist      *sg = host->sg;
1079         void                    *buf = sg_virt(sg);
1080         unsigned int            offset = host->pio_offset;
1081         struct mmc_data         *data = host->data;
1082         u32                     value;
1083         u32                     status;
1084         unsigned int            nbytes = 0;
1085
1086         do {
1087                 value = mci_readl(host, RDR);
1088                 if (likely(offset + 4 <= sg->length)) {
1089                         put_unaligned(value, (u32 *)(buf + offset));
1090
1091                         offset += 4;
1092                         nbytes += 4;
1093
1094                         if (offset == sg->length) {
1095                                 host->sg = sg = sg_next(sg);
1096                                 if (!sg)
1097                                         goto done;
1098
1099                                 offset = 0;
1100                                 buf = sg_virt(sg);
1101                         }
1102                 } else {
1103                         unsigned int remaining = sg->length - offset;
1104                         memcpy(buf + offset, &value, remaining);
1105                         nbytes += remaining;
1106
1107                         flush_dcache_page(sg_page(sg));
1108                         host->sg = sg = sg_next(sg);
1109                         if (!sg)
1110                                 goto done;
1111
1112                         offset = 4 - remaining;
1113                         buf = sg_virt(sg);
1114                         memcpy(buf, (u8 *)&value + remaining, offset);
1115                         nbytes += offset;
1116                 }
1117
1118                 status = mci_readl(host, SR);
1119                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1120                         mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY
1121                                                 | ATMCI_DATA_ERROR_FLAGS));
1122                         host->data_status = status;
1123                         data->bytes_xfered += nbytes;
1124                         smp_wmb();
1125                         atmci_set_pending(host, EVENT_DATA_ERROR);
1126                         tasklet_schedule(&host->tasklet);
1127                         return;
1128                 }
1129         } while (status & MCI_RXRDY);
1130
1131         host->pio_offset = offset;
1132         data->bytes_xfered += nbytes;
1133
1134         return;
1135
1136 done:
1137         mci_writel(host, IDR, MCI_RXRDY);
1138         mci_writel(host, IER, MCI_NOTBUSY);
1139         data->bytes_xfered += nbytes;
1140         smp_wmb();
1141         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1142 }
1143
1144 static void atmci_write_data_pio(struct atmel_mci *host)
1145 {
1146         struct scatterlist      *sg = host->sg;
1147         void                    *buf = sg_virt(sg);
1148         unsigned int            offset = host->pio_offset;
1149         struct mmc_data         *data = host->data;
1150         u32                     value;
1151         u32                     status;
1152         unsigned int            nbytes = 0;
1153
1154         do {
1155                 if (likely(offset + 4 <= sg->length)) {
1156                         value = get_unaligned((u32 *)(buf + offset));
1157                         mci_writel(host, TDR, value);
1158
1159                         offset += 4;
1160                         nbytes += 4;
1161                         if (offset == sg->length) {
1162                                 host->sg = sg = sg_next(sg);
1163                                 if (!sg)
1164                                         goto done;
1165
1166                                 offset = 0;
1167                                 buf = sg_virt(sg);
1168                         }
1169                 } else {
1170                         unsigned int remaining = sg->length - offset;
1171
1172                         value = 0;
1173                         memcpy(&value, buf + offset, remaining);
1174                         nbytes += remaining;
1175
1176                         host->sg = sg = sg_next(sg);
1177                         if (!sg) {
1178                                 mci_writel(host, TDR, value);
1179                                 goto done;
1180                         }
1181
1182                         offset = 4 - remaining;
1183                         buf = sg_virt(sg);
1184                         memcpy((u8 *)&value + remaining, buf, offset);
1185                         mci_writel(host, TDR, value);
1186                         nbytes += offset;
1187                 }
1188
1189                 status = mci_readl(host, SR);
1190                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1191                         mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY
1192                                                 | ATMCI_DATA_ERROR_FLAGS));
1193                         host->data_status = status;
1194                         data->bytes_xfered += nbytes;
1195                         smp_wmb();
1196                         atmci_set_pending(host, EVENT_DATA_ERROR);
1197                         tasklet_schedule(&host->tasklet);
1198                         return;
1199                 }
1200         } while (status & MCI_TXRDY);
1201
1202         host->pio_offset = offset;
1203         data->bytes_xfered += nbytes;
1204
1205         return;
1206
1207 done:
1208         mci_writel(host, IDR, MCI_TXRDY);
1209         mci_writel(host, IER, MCI_NOTBUSY);
1210         data->bytes_xfered += nbytes;
1211         smp_wmb();
1212         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1213 }
1214
1215 static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
1216 {
1217         mci_writel(host, IDR, MCI_CMDRDY);
1218
1219         host->cmd_status = status;
1220         smp_wmb();
1221         atmci_set_pending(host, EVENT_CMD_COMPLETE);
1222         tasklet_schedule(&host->tasklet);
1223 }
1224
1225 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1226 {
1227         struct atmel_mci        *host = dev_id;
1228         u32                     status, mask, pending;
1229         unsigned int            pass_count = 0;
1230
1231         do {
1232                 status = mci_readl(host, SR);
1233                 mask = mci_readl(host, IMR);
1234                 pending = status & mask;
1235                 if (!pending)
1236                         break;
1237
1238                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
1239                         mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS
1240                                         | MCI_RXRDY | MCI_TXRDY);
1241                         pending &= mci_readl(host, IMR);
1242
1243                         host->data_status = status;
1244                         smp_wmb();
1245                         atmci_set_pending(host, EVENT_DATA_ERROR);
1246                         tasklet_schedule(&host->tasklet);
1247                 }
1248                 if (pending & MCI_NOTBUSY) {
1249                         mci_writel(host, IDR,
1250                                         ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY);
1251                         host->data_status = status;
1252                         smp_wmb();
1253                         atmci_set_pending(host, EVENT_DATA_COMPLETE);
1254                         tasklet_schedule(&host->tasklet);
1255                 }
1256                 if (pending & MCI_RXRDY)
1257                         atmci_read_data_pio(host);
1258                 if (pending & MCI_TXRDY)
1259                         atmci_write_data_pio(host);
1260
1261                 if (pending & MCI_CMDRDY)
1262                         atmci_cmd_interrupt(host, status);
1263         } while (pass_count++ < 5);
1264
1265         return pass_count ? IRQ_HANDLED : IRQ_NONE;
1266 }
1267
1268 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
1269 {
1270         struct atmel_mci_slot   *slot = dev_id;
1271
1272         /*
1273          * Disable interrupts until the pin has stabilized and check
1274          * the state then. Use mod_timer() since we may be in the
1275          * middle of the timer routine when this interrupt triggers.
1276          */
1277         disable_irq_nosync(irq);
1278         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
1279
1280         return IRQ_HANDLED;
1281 }
1282
1283 static int __init atmci_init_slot(struct atmel_mci *host,
1284                 struct mci_slot_pdata *slot_data, unsigned int id,
1285                 u32 sdc_reg)
1286 {
1287         struct mmc_host                 *mmc;
1288         struct atmel_mci_slot           *slot;
1289
1290         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
1291         if (!mmc)
1292                 return -ENOMEM;
1293
1294         slot = mmc_priv(mmc);
1295         slot->mmc = mmc;
1296         slot->host = host;
1297         slot->detect_pin = slot_data->detect_pin;
1298         slot->wp_pin = slot_data->wp_pin;
1299         slot->sdc_reg = sdc_reg;
1300
1301         mmc->ops = &atmci_ops;
1302         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
1303         mmc->f_max = host->bus_hz / 2;
1304         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1305         if (slot_data->bus_width >= 4)
1306                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1307
1308         mmc->max_hw_segs = 64;
1309         mmc->max_phys_segs = 64;
1310         mmc->max_req_size = 32768 * 512;
1311         mmc->max_blk_size = 32768;
1312         mmc->max_blk_count = 512;
1313
1314         /* Assume card is present initially */
1315         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1316         if (gpio_is_valid(slot->detect_pin)) {
1317                 if (gpio_request(slot->detect_pin, "mmc_detect")) {
1318                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
1319                         slot->detect_pin = -EBUSY;
1320                 } else if (gpio_get_value(slot->detect_pin)) {
1321                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1322                 }
1323         }
1324
1325         if (!gpio_is_valid(slot->detect_pin))
1326                 mmc->caps |= MMC_CAP_NEEDS_POLL;
1327
1328         if (gpio_is_valid(slot->wp_pin)) {
1329                 if (gpio_request(slot->wp_pin, "mmc_wp")) {
1330                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
1331                         slot->wp_pin = -EBUSY;
1332                 }
1333         }
1334
1335         host->slot[id] = slot;
1336         mmc_add_host(mmc);
1337
1338         if (gpio_is_valid(slot->detect_pin)) {
1339                 int ret;
1340
1341                 setup_timer(&slot->detect_timer, atmci_detect_change,
1342                                 (unsigned long)slot);
1343
1344                 ret = request_irq(gpio_to_irq(slot->detect_pin),
1345                                 atmci_detect_interrupt,
1346                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
1347                                 "mmc-detect", slot);
1348                 if (ret) {
1349                         dev_dbg(&mmc->class_dev,
1350                                 "could not request IRQ %d for detect pin\n",
1351                                 gpio_to_irq(slot->detect_pin));
1352                         gpio_free(slot->detect_pin);
1353                         slot->detect_pin = -EBUSY;
1354                 }
1355         }
1356
1357         atmci_init_debugfs(slot);
1358
1359         return 0;
1360 }
1361
1362 static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
1363                 unsigned int id)
1364 {
1365         /* Debugfs stuff is cleaned up by mmc core */
1366
1367         set_bit(ATMCI_SHUTDOWN, &slot->flags);
1368         smp_wmb();
1369
1370         mmc_remove_host(slot->mmc);
1371
1372         if (gpio_is_valid(slot->detect_pin)) {
1373                 int pin = slot->detect_pin;
1374
1375                 free_irq(gpio_to_irq(pin), slot);
1376                 del_timer_sync(&slot->detect_timer);
1377                 gpio_free(pin);
1378         }
1379         if (gpio_is_valid(slot->wp_pin))
1380                 gpio_free(slot->wp_pin);
1381
1382         slot->host->slot[id] = NULL;
1383         mmc_free_host(slot->mmc);
1384 }
1385
1386 static int __init atmci_probe(struct platform_device *pdev)
1387 {
1388         struct mci_platform_data        *pdata;
1389         struct atmel_mci                *host;
1390         struct resource                 *regs;
1391         unsigned int                    nr_slots;
1392         int                             irq;
1393         int                             ret;
1394
1395         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1396         if (!regs)
1397                 return -ENXIO;
1398         pdata = pdev->dev.platform_data;
1399         if (!pdata)
1400                 return -ENXIO;
1401         irq = platform_get_irq(pdev, 0);
1402         if (irq < 0)
1403                 return irq;
1404
1405         host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
1406         if (!host)
1407                 return -ENOMEM;
1408
1409         host->pdev = pdev;
1410         spin_lock_init(&host->lock);
1411         INIT_LIST_HEAD(&host->queue);
1412
1413         host->mck = clk_get(&pdev->dev, "mci_clk");
1414         if (IS_ERR(host->mck)) {
1415                 ret = PTR_ERR(host->mck);
1416                 goto err_clk_get;
1417         }
1418
1419         ret = -ENOMEM;
1420         host->regs = ioremap(regs->start, regs->end - regs->start + 1);
1421         if (!host->regs)
1422                 goto err_ioremap;
1423
1424         clk_enable(host->mck);
1425         mci_writel(host, CR, MCI_CR_SWRST);
1426         host->bus_hz = clk_get_rate(host->mck);
1427         clk_disable(host->mck);
1428
1429         host->mapbase = regs->start;
1430
1431         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
1432
1433         ret = request_irq(irq, atmci_interrupt, 0, pdev->dev.bus_id, host);
1434         if (ret)
1435                 goto err_request_irq;
1436
1437         platform_set_drvdata(pdev, host);
1438
1439         /* We need at least one slot to succeed */
1440         nr_slots = 0;
1441         ret = -ENODEV;
1442         if (pdata->slot[0].bus_width) {
1443                 ret = atmci_init_slot(host, &pdata->slot[0],
1444                                 MCI_SDCSEL_SLOT_A, 0);
1445                 if (!ret)
1446                         nr_slots++;
1447         }
1448         if (pdata->slot[1].bus_width) {
1449                 ret = atmci_init_slot(host, &pdata->slot[1],
1450                                 MCI_SDCSEL_SLOT_B, 1);
1451                 if (!ret)
1452                         nr_slots++;
1453         }
1454
1455         if (!nr_slots)
1456                 goto err_init_slot;
1457
1458         dev_info(&pdev->dev,
1459                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
1460                         host->mapbase, irq, nr_slots);
1461
1462         return 0;
1463
1464 err_init_slot:
1465         free_irq(irq, host);
1466 err_request_irq:
1467         iounmap(host->regs);
1468 err_ioremap:
1469         clk_put(host->mck);
1470 err_clk_get:
1471         kfree(host);
1472         return ret;
1473 }
1474
1475 static int __exit atmci_remove(struct platform_device *pdev)
1476 {
1477         struct atmel_mci        *host = platform_get_drvdata(pdev);
1478         unsigned int            i;
1479
1480         platform_set_drvdata(pdev, NULL);
1481
1482         for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
1483                 if (host->slot[i])
1484                         atmci_cleanup_slot(host->slot[i], i);
1485         }
1486
1487         clk_enable(host->mck);
1488         mci_writel(host, IDR, ~0UL);
1489         mci_writel(host, CR, MCI_CR_MCIDIS);
1490         mci_readl(host, SR);
1491         clk_disable(host->mck);
1492
1493         free_irq(platform_get_irq(pdev, 0), host);
1494         iounmap(host->regs);
1495
1496         clk_put(host->mck);
1497         kfree(host);
1498
1499         return 0;
1500 }
1501
1502 static struct platform_driver atmci_driver = {
1503         .remove         = __exit_p(atmci_remove),
1504         .driver         = {
1505                 .name           = "atmel_mci",
1506         },
1507 };
1508
1509 static int __init atmci_init(void)
1510 {
1511         return platform_driver_probe(&atmci_driver, atmci_probe);
1512 }
1513
1514 static void __exit atmci_exit(void)
1515 {
1516         platform_driver_unregister(&atmci_driver);
1517 }
1518
1519 module_init(atmci_init);
1520 module_exit(atmci_exit);
1521
1522 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
1523 MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>");
1524 MODULE_LICENSE("GPL v2");