drivers/mmc/omap.c

   1 /*
   2  *  linux/drivers/media/mmc/omap.c
   3  *
   4  *  Copyright (C) 2004 Nokia Corporation
   5  *  Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com>
   6  *  Misc hacks here and there by Tony Lindgren <tony@atomide.com>
   7  *  Other hacks (DMA, SD, etc) by David Brownell
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/ioport.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/delay.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/timer.h>
  25 #include <linux/mmc/host.h>
  26 #include <linux/mmc/protocol.h>
  27 #include <linux/mmc/card.h>
  28 #include <linux/clk.h>
  29
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32 #include <asm/scatterlist.h>
  33 #include <asm/mach-types.h>
  34
  35 #include <asm/arch/board.h>
  36 #include <asm/arch/gpio.h>
  37 #include <asm/arch/dma.h>
  38 #include <asm/arch/mux.h>
  39 #include <asm/arch/fpga.h>
  40 #include <asm/arch/tps65010.h>
  41
  42 #include "omap.h"
  43
  44 #define DRIVER_NAME "mmci-omap"
  45 #define RSP_TYPE(x)     ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
  46
  47 /* Specifies how often in millisecs to poll for card status changes
  48  * when the cover switch is open */
  49 #define OMAP_MMC_SWITCH_POLL_DELAY      500
  50
  51 static int mmc_omap_enable_poll = 1;
  52
  53 struct mmc_omap_host {
  54         int                     initialized;
  55         int                     suspended;
  56         struct mmc_request *    mrq;
  57         struct mmc_command *    cmd;
  58         struct mmc_data *       data;
  59         struct mmc_host *       mmc;
  60         struct device *         dev;
  61         unsigned char           id; /* 16xx chips have 2 MMC blocks */
  62         struct clk *            iclk;
  63         struct clk *            fclk;
  64         void __iomem            *base;
  65         int                     irq;
  66         unsigned char           bus_mode;
  67         unsigned char           hw_bus_mode;
  68
  69         unsigned int            sg_len;
  70         int                     sg_idx;
  71         u16 *                   buffer;
  72         u32                     buffer_bytes_left;
  73         u32                     total_bytes_left;
  74
  75         unsigned                use_dma:1;
  76         unsigned                brs_received:1, dma_done:1;
  77         unsigned                dma_is_read:1;
  78         unsigned                dma_in_use:1;
  79         int                     dma_ch;
  80         spinlock_t              dma_lock;
  81         struct timer_list       dma_timer;
  82         unsigned                dma_len;
  83
  84         short                   power_pin;
  85         short                   wp_pin;
  86
  87         int                     switch_pin;
  88         struct work_struct      switch_work;
  89         struct timer_list       switch_timer;
  90         int                     switch_last_state;
  91 };
  92
  93 static inline int
  94 mmc_omap_cover_is_open(struct mmc_omap_host *host)
  95 {
  96         if (host->switch_pin < 0)
  97                 return 0;
  98         return omap_get_gpio_datain(host->switch_pin);
  99 }
 100
 101 static ssize_t
 102 mmc_omap_show_cover_switch(struct device *dev,
 103         struct device_attribute *attr, char *buf)
 104 {
 105         struct mmc_omap_host *host = dev_get_drvdata(dev);
 106
 107         return sprintf(buf, "%s\n", mmc_omap_cover_is_open(host) ? "open" :
 108                         "closed");
 109 }
 110
 111 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
 112
 113 static ssize_t
 114 mmc_omap_show_enable_poll(struct device *dev,
 115         struct device_attribute *attr, char *buf)
 116 {
 117         return snprintf(buf, PAGE_SIZE, "%d\n", mmc_omap_enable_poll);
 118 }
 119
 120 static ssize_t
 121 mmc_omap_store_enable_poll(struct device *dev,
 122         struct device_attribute *attr, const char *buf,
 123         size_t size)
 124 {
 125         int enable_poll;
 126
 127         if (sscanf(buf, "%10d", &enable_poll) != 1)
 128                 return -EINVAL;
 129
 130         if (enable_poll != mmc_omap_enable_poll) {
 131                 struct mmc_omap_host *host = dev_get_drvdata(dev);
 132
 133                 mmc_omap_enable_poll = enable_poll;
 134                 if (enable_poll && host->switch_pin >= 0)
 135                         schedule_work(&host->switch_work);
 136         }
 137         return size;
 138 }
 139
 140 static DEVICE_ATTR(enable_poll, 0664,
 141                    mmc_omap_show_enable_poll, mmc_omap_store_enable_poll);
 142
 143 static void
 144 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
 145 {
 146         u32 cmdreg;
 147         u32 resptype;
 148         u32 cmdtype;
 149
 150         host->cmd = cmd;
 151
 152         resptype = 0;
 153         cmdtype = 0;
 154
 155         /* Our hardware needs to know exact type */
 156         switch (RSP_TYPE(mmc_resp_type(cmd))) {
 157         case RSP_TYPE(MMC_RSP_R1):
 158                 /* resp 1, resp 1b */
 159                 resptype = 1;
 160                 break;
 161         case RSP_TYPE(MMC_RSP_R2):
 162                 resptype = 2;
 163                 break;
 164         case RSP_TYPE(MMC_RSP_R3):
 165                 resptype = 3;
 166                 break;
 167         default:
 168                 break;
 169         }
 170
 171         if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
 172                 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
 173         } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
 174                 cmdtype = OMAP_MMC_CMDTYPE_BC;
 175         } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
 176                 cmdtype = OMAP_MMC_CMDTYPE_BCR;
 177         } else {
 178                 cmdtype = OMAP_MMC_CMDTYPE_AC;
 179         }
 180
 181         cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
 182
 183         if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
 184                 cmdreg |= 1 << 6;
 185
 186         if (cmd->flags & MMC_RSP_BUSY)
 187                 cmdreg |= 1 << 11;
 188
 189         if (host->data && !(host->data->flags & MMC_DATA_WRITE))
 190                 cmdreg |= 1 << 15;
 191
 192         clk_enable(host->fclk);
 193
 194         OMAP_MMC_WRITE(host->base, CTO, 200);
 195         OMAP_MMC_WRITE(host->base, ARGL, cmd->arg & 0xffff);
 196         OMAP_MMC_WRITE(host->base, ARGH, cmd->arg >> 16);
 197         OMAP_MMC_WRITE(host->base, IE,
 198                        OMAP_MMC_STAT_A_EMPTY    | OMAP_MMC_STAT_A_FULL    |
 199                        OMAP_MMC_STAT_CMD_CRC    | OMAP_MMC_STAT_CMD_TOUT  |
 200                        OMAP_MMC_STAT_DATA_CRC   | OMAP_MMC_STAT_DATA_TOUT |
 201                        OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR  |
 202                        OMAP_MMC_STAT_END_OF_DATA);
 203         OMAP_MMC_WRITE(host->base, CMD, cmdreg);
 204 }
 205
 206 static void
 207 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 208 {
 209         if (host->dma_in_use) {
 210                 enum dma_data_direction dma_data_dir;
 211
 212                 BUG_ON(host->dma_ch < 0);
 213                 if (data->error != MMC_ERR_NONE)
 214                         omap_stop_dma(host->dma_ch);
 215                 /* Release DMA channel lazily */
 216                 mod_timer(&host->dma_timer, jiffies + HZ);
 217                 if (data->flags & MMC_DATA_WRITE)
 218                         dma_data_dir = DMA_TO_DEVICE;
 219                 else
 220                         dma_data_dir = DMA_FROM_DEVICE;
 221                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
 222                              dma_data_dir);
 223         }
 224         host->data = NULL;
 225         host->sg_len = 0;
 226         clk_disable(host->fclk);
 227
 228         /* NOTE:  MMC layer will sometimes poll-wait CMD13 next, issuing
 229          * dozens of requests until the card finishes writing data.
 230          * It'd be cheaper to just wait till an EOFB interrupt arrives...
 231          */
 232
 233         if (!data->stop) {
 234                 host->mrq = NULL;
 235                 mmc_request_done(host->mmc, data->mrq);
 236                 return;
 237         }
 238
 239         mmc_omap_start_command(host, data->stop);
 240 }
 241
 242 static void
 243 mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
 244 {
 245         unsigned long flags;
 246         int done;
 247
 248         if (!host->dma_in_use) {
 249                 mmc_omap_xfer_done(host, data);
 250                 return;
 251         }
 252         done = 0;
 253         spin_lock_irqsave(&host->dma_lock, flags);
 254         if (host->dma_done)
 255                 done = 1;
 256         else
 257                 host->brs_received = 1;
 258         spin_unlock_irqrestore(&host->dma_lock, flags);
 259         if (done)
 260                 mmc_omap_xfer_done(host, data);
 261 }
 262
 263 static void
 264 mmc_omap_dma_timer(unsigned long data)
 265 {
 266         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 267
 268         BUG_ON(host->dma_ch < 0);
 269         omap_free_dma(host->dma_ch);
 270         host->dma_ch = -1;
 271 }
 272
 273 static void
 274 mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
 275 {
 276         unsigned long flags;
 277         int done;
 278
 279         done = 0;
 280         spin_lock_irqsave(&host->dma_lock, flags);
 281         if (host->brs_received)
 282                 done = 1;
 283         else
 284                 host->dma_done = 1;
 285         spin_unlock_irqrestore(&host->dma_lock, flags);
 286         if (done)
 287                 mmc_omap_xfer_done(host, data);
 288 }
 289
 290 static void
 291 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 292 {
 293         host->cmd = NULL;
 294
 295         if (cmd->flags & MMC_RSP_PRESENT) {
 296                 if (cmd->flags & MMC_RSP_136) {
 297                         /* response type 2 */
 298                         cmd->resp[3] =
 299                                 OMAP_MMC_READ(host->base, RSP0) |
 300                                 (OMAP_MMC_READ(host->base, RSP1) << 16);
 301                         cmd->resp[2] =
 302                                 OMAP_MMC_READ(host->base, RSP2) |
 303                                 (OMAP_MMC_READ(host->base, RSP3) << 16);
 304                         cmd->resp[1] =
 305                                 OMAP_MMC_READ(host->base, RSP4) |
 306                                 (OMAP_MMC_READ(host->base, RSP5) << 16);
 307                         cmd->resp[0] =
 308                                 OMAP_MMC_READ(host->base, RSP6) |
 309                                 (OMAP_MMC_READ(host->base, RSP7) << 16);
 310                 } else {
 311                         /* response types 1, 1b, 3, 4, 5, 6 */
 312                         cmd->resp[0] =
 313                                 OMAP_MMC_READ(host->base, RSP6) |
 314                                 (OMAP_MMC_READ(host->base, RSP7) << 16);
 315                 }
 316         }
 317
 318         if (host->data == NULL || cmd->error != MMC_ERR_NONE) {
 319                 host->mrq = NULL;
 320                 clk_disable(host->fclk);
 321                 mmc_request_done(host->mmc, cmd->mrq);
 322         }
 323 }
 324
 325 /* PIO only */
 326 static void
 327 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 328 {
 329         struct scatterlist *sg;
 330
 331         sg = host->data->sg + host->sg_idx;
 332         host->buffer_bytes_left = sg->length;
 333         host->buffer = page_address(sg->page) + sg->offset;
 334         if (host->buffer_bytes_left > host->total_bytes_left)
 335                 host->buffer_bytes_left = host->total_bytes_left;
 336 }
 337
 338 /* PIO only */
 339 static void
 340 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 341 {
 342         int n;
 343         void __iomem *reg;
 344         u16 *p;
 345
 346         if (host->buffer_bytes_left == 0) {
 347                 host->sg_idx++;
 348                 BUG_ON(host->sg_idx == host->sg_len);
 349                 mmc_omap_sg_to_buf(host);
 350         }
 351         n = 64;
 352         if (n > host->buffer_bytes_left)
 353                 n = host->buffer_bytes_left;
 354         host->buffer_bytes_left -= n;
 355         host->total_bytes_left -= n;
 356         host->data->bytes_xfered += n;
 357
 358         if (write) {
 359                 __raw_writesw(host->base + OMAP_MMC_REG_DATA, host->buffer, n);
 360         } else {
 361                 __raw_readsw(host->base + OMAP_MMC_REG_DATA, host->buffer, n);
 362         }
 363 }
 364
 365 static inline void mmc_omap_report_irq(u16 status)
 366 {
 367         static const char *mmc_omap_status_bits[] = {
 368                 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
 369                 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
 370         };
 371         int i, c = 0;
 372
 373         for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
 374                 if (status & (1 << i)) {
 375                         if (c)
 376                                 printk(" ");
 377                         printk("%s", mmc_omap_status_bits[i]);
 378                         c++;
 379                 }
 380 }
 381
 382 static irqreturn_t mmc_omap_irq(int irq, void *dev_id, struct pt_regs *regs)
 383 {
 384         struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
 385         u16 status;
 386         int end_command;
 387         int end_transfer;
 388         int transfer_error;
 389
 390         if (host->cmd == NULL && host->data == NULL) {
 391                 status = OMAP_MMC_READ(host->base, STAT);
 392                 dev_info(mmc_dev(host->mmc),"spurious irq 0x%04x\n", status);
 393                 if (status != 0) {
 394                         OMAP_MMC_WRITE(host->base, STAT, status);
 395                         OMAP_MMC_WRITE(host->base, IE, 0);
 396                 }
 397                 return IRQ_HANDLED;
 398         }
 399
 400         end_command = 0;
 401         end_transfer = 0;
 402         transfer_error = 0;
 403
 404         while ((status = OMAP_MMC_READ(host->base, STAT)) != 0) {
 405                 OMAP_MMC_WRITE(host->base, STAT, status);
 406 #ifdef CONFIG_MMC_DEBUG
 407                 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
 408                         status, host->cmd != NULL ? host->cmd->opcode : -1);
 409                 mmc_omap_report_irq(status);
 410                 printk("\n");
 411 #endif
 412                 if (host->total_bytes_left) {
 413                         if ((status & OMAP_MMC_STAT_A_FULL) ||
 414                             (status & OMAP_MMC_STAT_END_OF_DATA))
 415                                 mmc_omap_xfer_data(host, 0);
 416                         if (status & OMAP_MMC_STAT_A_EMPTY)
 417                                 mmc_omap_xfer_data(host, 1);
 418                 }
 419
 420                 if (status & OMAP_MMC_STAT_END_OF_DATA) {
 421                         end_transfer = 1;
 422                 }
 423
 424                 if (status & OMAP_MMC_STAT_DATA_TOUT) {
 425                         dev_dbg(mmc_dev(host->mmc), "data timeout\n");
 426                         if (host->data) {
 427                                 host->data->error |= MMC_ERR_TIMEOUT;
 428                                 transfer_error = 1;
 429                         }
 430                 }
 431
 432                 if (status & OMAP_MMC_STAT_DATA_CRC) {
 433                         if (host->data) {
 434                                 host->data->error |= MMC_ERR_BADCRC;
 435                                 dev_dbg(mmc_dev(host->mmc),
 436                                          "data CRC error, bytes left %d\n",
 437                                         host->total_bytes_left);
 438                                 transfer_error = 1;
 439                         } else {
 440                                 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
 441                         }
 442                 }
 443
 444                 if (status & OMAP_MMC_STAT_CMD_TOUT) {
 445                         /* Timeouts are routine with some commands */
 446                         if (host->cmd) {
 447                                 if (host->cmd->opcode != MMC_ALL_SEND_CID &&
 448                                                 host->cmd->opcode !=
 449                                                 MMC_SEND_OP_COND &&
 450                                                 host->cmd->opcode !=
 451                                                 MMC_APP_CMD &&
 452                                                 !mmc_omap_cover_is_open(host))
 453                                         dev_err(mmc_dev(host->mmc),
 454                                                 "command timeout, CMD %d\n",
 455                                                 host->cmd->opcode);
 456                                 host->cmd->error = MMC_ERR_TIMEOUT;
 457                                 end_command = 1;
 458                         }
 459                 }
 460
 461                 if (status & OMAP_MMC_STAT_CMD_CRC) {
 462                         if (host->cmd) {
 463                                 dev_err(mmc_dev(host->mmc),
 464                                         "command CRC error (CMD%d, arg 0x%08x)\n",
 465                                         host->cmd->opcode, host->cmd->arg);
 466                                 host->cmd->error = MMC_ERR_BADCRC;
 467                                 end_command = 1;
 468                         } else
 469                                 dev_err(mmc_dev(host->mmc),
 470                                         "command CRC error without cmd?\n");
 471                 }
 472
 473                 if (status & OMAP_MMC_STAT_CARD_ERR) {
 474                         if (host->cmd && host->cmd->opcode == MMC_STOP_TRANSMISSION) {
 475                                 u32 response = OMAP_MMC_READ(host->base, RSP6)
 476                                         | (OMAP_MMC_READ(host->base, RSP7) << 16);
 477                                 /* STOP sometimes sets must-ignore bits */
 478                                 if (!(response & (R1_CC_ERROR
 479                                                                 | R1_ILLEGAL_COMMAND
 480                                                                 | R1_COM_CRC_ERROR))) {
 481                                         end_command = 1;
 482                                         continue;
 483                                 }
 484                         }
 485
 486                         dev_dbg(mmc_dev(host->mmc), "card status error (CMD%d)\n",
 487                                 host->cmd->opcode);
 488                         if (host->cmd) {
 489                                 host->cmd->error = MMC_ERR_FAILED;
 490                                 end_command = 1;
 491                         }
 492                         if (host->data) {
 493                                 host->data->error = MMC_ERR_FAILED;
 494                                 transfer_error = 1;
 495                         }
 496                 }
 497
 498                 /*
 499                  * NOTE: On 1610 the END_OF_CMD may come too early when
 500                  * starting a write
 501                  */
 502                 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
 503                     (!(status & OMAP_MMC_STAT_A_EMPTY))) {
 504                         end_command = 1;
 505                 }
 506         }
 507
 508         if (end_command) {
 509                 mmc_omap_cmd_done(host, host->cmd);
 510         }
 511         if (transfer_error)
 512                 mmc_omap_xfer_done(host, host->data);
 513         else if (end_transfer)
 514                 mmc_omap_end_of_data(host, host->data);
 515
 516         return IRQ_HANDLED;
 517 }
 518
 519 static irqreturn_t mmc_omap_switch_irq(int irq, void *dev_id, struct pt_regs *regs)
 520 {
 521         struct mmc_omap_host *host = (struct mmc_omap_host *) dev_id;
 522
 523         schedule_work(&host->switch_work);
 524
 525         return IRQ_HANDLED;
 526 }
 527
 528 static void mmc_omap_switch_timer(unsigned long arg)
 529 {
 530         struct mmc_omap_host *host = (struct mmc_omap_host *) arg;
 531
 532         schedule_work(&host->switch_work);
 533 }
 534
 535 /* FIXME: Handle card insertion and removal properly. Maybe use a mask
 536  * for MMC state? */
 537 static void mmc_omap_switch_callback(unsigned long data, u8 mmc_mask)
 538 {
 539 }
 540
 541 static void mmc_omap_switch_handler(void *data)
 542 {
 543         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 544         struct mmc_card *card;
 545         static int complained = 0;
 546         int cards = 0, cover_open;
 547
 548         if (host->switch_pin == -1)
 549                 return;
 550         cover_open = mmc_omap_cover_is_open(host);
 551         if (cover_open != host->switch_last_state) {
 552                 kobject_uevent(&host->dev->kobj, KOBJ_CHANGE);
 553                 host->switch_last_state = cover_open;
 554         }
 555         mmc_detect_change(host->mmc, 0);
 556         list_for_each_entry(card, &host->mmc->cards, node) {
 557                 if (mmc_card_present(card))
 558                         cards++;
 559         }
 560         if (mmc_omap_cover_is_open(host)) {
 561                 if (!complained) {
 562                         dev_info(mmc_dev(host->mmc), "cover is open");
 563                         complained = 1;
 564                 }
 565                 if (mmc_omap_enable_poll)
 566                         mod_timer(&host->switch_timer, jiffies +
 567                                 msecs_to_jiffies(OMAP_MMC_SWITCH_POLL_DELAY));
 568         } else {
 569                 complained = 0;
 570         }
 571 }
 572
 573 /* Prepare to transfer the next segment of a scatterlist */
 574 static void
 575 mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
 576 {
 577         int dma_ch = host->dma_ch;
 578         unsigned long data_addr;
 579         u16 buf, frame;
 580         u32 count;
 581         struct scatterlist *sg = &data->sg[host->sg_idx];
 582         int src_port = 0;
 583         int dst_port = 0;
 584         int sync_dev = 0;
 585
 586         data_addr = io_v2p((u32) host->base) + OMAP_MMC_REG_DATA;
 587         frame = 1 << data->blksz_bits;
 588         count = sg_dma_len(sg);
 589
 590         if ((data->blocks == 1) && (count > (1 << data->blksz_bits)))
 591                 count = frame;
 592
 593         host->dma_len = count;
 594
 595         /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
 596          * Use 16 or 32 word frames when the blocksize is at least that large.
 597          * Blocksize is usually 512 bytes; but not for some SD reads.
 598          */
 599         if (cpu_is_omap15xx() && frame > 32)
 600                 frame = 32;
 601         else if (frame > 64)
 602                 frame = 64;
 603         count /= frame;
 604         frame >>= 1;
 605
 606         if (!(data->flags & MMC_DATA_WRITE)) {
 607                 buf = 0x800f | ((frame - 1) << 8);
 608
 609                 if (cpu_class_is_omap1()) {
 610                         src_port = OMAP_DMA_PORT_TIPB;
 611                         dst_port = OMAP_DMA_PORT_EMIFF;
 612                 }
 613                 if (cpu_is_omap24xx())
 614                         sync_dev = OMAP24XX_DMA_MMC1_RX;
 615
 616                 omap_set_dma_src_params(dma_ch, src_port,
 617                                         OMAP_DMA_AMODE_CONSTANT,
 618                                         data_addr, 0, 0);
 619                 omap_set_dma_dest_params(dma_ch, dst_port,
 620                                          OMAP_DMA_AMODE_POST_INC,
 621                                          sg_dma_address(sg), 0, 0);
 622                 omap_set_dma_dest_data_pack(dma_ch, 1);
 623                 omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
 624         } else {
 625                 buf = 0x0f80 | ((frame - 1) << 0);
 626
 627                 if (cpu_class_is_omap1()) {
 628                         src_port = OMAP_DMA_PORT_EMIFF;
 629                         dst_port = OMAP_DMA_PORT_TIPB;
 630                 }
 631                 if (cpu_is_omap24xx())
 632                         sync_dev = OMAP24XX_DMA_MMC1_TX;
 633
 634                 omap_set_dma_dest_params(dma_ch, dst_port,
 635                                          OMAP_DMA_AMODE_CONSTANT,
 636                                          data_addr, 0, 0);
 637                 omap_set_dma_src_params(dma_ch, src_port,
 638                                         OMAP_DMA_AMODE_POST_INC,
 639                                         sg_dma_address(sg), 0, 0);
 640                 omap_set_dma_src_data_pack(dma_ch, 1);
 641                 omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
 642         }
 643
 644         /* Max limit for DMA frame count is 0xffff */
 645         if (unlikely(count > 0xffff))
 646                 BUG();
 647
 648         OMAP_MMC_WRITE(host->base, BUF, buf);
 649         omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
 650                                      frame, count, OMAP_DMA_SYNC_FRAME,
 651                                      sync_dev, 0);
 652 }
 653
 654 /* A scatterlist segment completed */
 655 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
 656 {
 657         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 658         struct mmc_data *mmcdat = host->data;
 659
 660         if (unlikely(host->dma_ch < 0)) {
 661                 dev_err(mmc_dev(host->mmc), "DMA callback while DMA not
 662                                 enabled\n");
 663                 return;
 664         }
 665         /* FIXME: We really should do something to _handle_ the errors */
 666         if (ch_status & OMAP_DMA_TOUT_IRQ) {
 667                 dev_err(mmc_dev(host->mmc),"DMA timeout\n");
 668                 return;
 669         }
 670         if (ch_status & OMAP_DMA_DROP_IRQ) {
 671                 dev_err(mmc_dev(host->mmc), "DMA sync error\n");
 672                 return;
 673         }
 674         if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
 675                 return;
 676         }
 677         mmcdat->bytes_xfered += host->dma_len;
 678         host->sg_idx++;
 679         if (host->sg_idx < host->sg_len) {
 680                 mmc_omap_prepare_dma(host, host->data);
 681                 omap_start_dma(host->dma_ch);
 682         } else
 683                 mmc_omap_dma_done(host, host->data);
 684 }
 685
 686 static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
 687 {
 688         const char *dev_name;
 689         int sync_dev, dma_ch, is_read, r;
 690
 691         is_read = !(data->flags & MMC_DATA_WRITE);
 692         del_timer_sync(&host->dma_timer);
 693         if (host->dma_ch >= 0) {
 694                 if (is_read == host->dma_is_read)
 695                         return 0;
 696                 omap_free_dma(host->dma_ch);
 697                 host->dma_ch = -1;
 698         }
 699
 700         if (is_read) {
 701                 if (host->id == 1) {
 702                         sync_dev = OMAP_DMA_MMC_RX;
 703                         dev_name = "MMC1 read";
 704                 } else {
 705                         sync_dev = OMAP_DMA_MMC2_RX;
 706                         dev_name = "MMC2 read";
 707                 }
 708         } else {
 709                 if (host->id == 1) {
 710                         sync_dev = OMAP_DMA_MMC_TX;
 711                         dev_name = "MMC1 write";
 712                 } else {
 713                         sync_dev = OMAP_DMA_MMC2_TX;
 714                         dev_name = "MMC2 write";
 715                 }
 716         }
 717         r = omap_request_dma(sync_dev, dev_name, mmc_omap_dma_cb,
 718                              host, &dma_ch);
 719         if (r != 0) {
 720                 dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
 721                 return r;
 722         }
 723         host->dma_ch = dma_ch;
 724         host->dma_is_read = is_read;
 725
 726         return 0;
 727 }
 728
 729 static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
 730 {
 731         u16 reg;
 732
 733         reg = OMAP_MMC_READ(host->base, SDIO);
 734         reg &= ~(1 << 5);
 735         OMAP_MMC_WRITE(host->base, SDIO, reg);
 736         /* Set maximum timeout */
 737         OMAP_MMC_WRITE(host->base, CTO, 0xff);
 738 }
 739
 740 static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
 741 {
 742         int timeout;
 743         u16 reg;
 744
 745         /* Convert ns to clock cycles by assuming 20MHz frequency
 746          * 1 cycle at 20MHz = 500 ns
 747          */
 748         timeout = req->data->timeout_clks + req->data->timeout_ns / 500;
 749
 750         /* Check if we need to use timeout multiplier register */
 751         reg = OMAP_MMC_READ(host->base, SDIO);
 752         if (timeout > 0xffff) {
 753                 reg |= (1 << 5);
 754                 timeout /= 1024;
 755         } else
 756                 reg &= ~(1 << 5);
 757         OMAP_MMC_WRITE(host->base, SDIO, reg);
 758         OMAP_MMC_WRITE(host->base, DTO, timeout);
 759 }
 760
 761 static void
 762 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 763 {
 764         struct mmc_data *data = req->data;
 765         int i, use_dma, block_size;
 766         unsigned sg_len;
 767
 768         host->data = data;
 769         if (data == NULL) {
 770                 OMAP_MMC_WRITE(host->base, BLEN, 0);
 771                 OMAP_MMC_WRITE(host->base, NBLK, 0);
 772                 OMAP_MMC_WRITE(host->base, BUF, 0);
 773                 host->dma_in_use = 0;
 774                 set_cmd_timeout(host, req);
 775                 return;
 776         }
 777
 778
 779         block_size = 1 << data->blksz_bits;
 780
 781         OMAP_MMC_WRITE(host->base, NBLK, data->blocks - 1);
 782         OMAP_MMC_WRITE(host->base, BLEN, block_size - 1);
 783         set_data_timeout(host, req);
 784
 785         /* cope with calling layer confusion; it issues "single
 786          * block" writes using multi-block scatterlists.
 787          */
 788         sg_len = (data->blocks == 1) ? 1 : data->sg_len;
 789
 790         /* Only do DMA for entire blocks */
 791         use_dma = host->use_dma;
 792         if (use_dma) {
 793                 for (i = 0; i < sg_len; i++) {
 794                         if ((data->sg[i].length % block_size) != 0) {
 795                                 use_dma = 0;
 796                                 break;
 797                         }
 798                 }
 799         }
 800
 801         host->sg_idx = 0;
 802         if (use_dma) {
 803                 if (mmc_omap_get_dma_channel(host, data) == 0) {
 804                         enum dma_data_direction dma_data_dir;
 805
 806                         if (data->flags & MMC_DATA_WRITE)
 807                                 dma_data_dir = DMA_TO_DEVICE;
 808                         else
 809                                 dma_data_dir = DMA_FROM_DEVICE;
 810
 811                         host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
 812                                                 sg_len, dma_data_dir);
 813                         host->total_bytes_left = 0;
 814                         mmc_omap_prepare_dma(host, req->data);
 815                         host->brs_received = 0;
 816                         host->dma_done = 0;
 817                         host->dma_in_use = 1;
 818                 } else
 819                         use_dma = 0;
 820         }
 821
 822         /* Revert to PIO? */
 823         if (!use_dma) {
 824                 OMAP_MMC_WRITE(host->base, BUF, 0x1f1f);
 825                 host->total_bytes_left = data->blocks * block_size;
 826                 host->sg_len = sg_len;
 827                 mmc_omap_sg_to_buf(host);
 828                 host->dma_in_use = 0;
 829         }
 830 }
 831
 832 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
 833 {
 834         struct mmc_omap_host *host = mmc_priv(mmc);
 835
 836         WARN_ON(host->mrq != NULL);
 837
 838         host->mrq = req;
 839
 840         /* only touch fifo AFTER the controller readies it */
 841         mmc_omap_prepare_data(host, req);
 842         mmc_omap_start_command(host, req->cmd);
 843         if (host->dma_in_use)
 844                 omap_start_dma(host->dma_ch);
 845 }
 846
 847 static void innovator_fpga_socket_power(int on)
 848 {
 849 #if defined(CONFIG_MACH_OMAP_INNOVATOR) && defined(CONFIG_ARCH_OMAP15XX)
 850
 851         if (on) {
 852                 fpga_write(fpga_read(OMAP1510_FPGA_POWER) | (1 << 3),
 853                      OMAP1510_FPGA_POWER);
 854         } else {
 855                 fpga_write(fpga_read(OMAP1510_FPGA_POWER) & ~(1 << 3),
 856                      OMAP1510_FPGA_POWER);
 857         }
 858 #endif
 859 }
 860
 861 /*
 862  * Turn the socket power on/off. Innovator uses FPGA, most boards
 863  * probably use GPIO.
 864  */
 865 static void mmc_omap_power(struct mmc_omap_host *host, int on)
 866 {
 867         if (on) {
 868                 if (machine_is_omap_innovator())
 869                         innovator_fpga_socket_power(1);
 870                 else if (machine_is_omap_h2())
 871                         tps65010_set_gpio_out_value(GPIO3, HIGH);
 872                 else if (machine_is_omap_h3())
 873                         /* GPIO 4 of TPS65010 sends SD_EN signal */
 874                         tps65010_set_gpio_out_value(GPIO4, HIGH);
 875                 else if (cpu_is_omap24xx()) {
 876                         u16 reg = OMAP_MMC_READ(host->base, CON);
 877                         OMAP_MMC_WRITE(host->base, CON, reg | (1 << 11));
 878                 } else
 879                         if (host->power_pin >= 0)
 880                                 omap_set_gpio_dataout(host->power_pin, 1);
 881         } else {
 882                 if (machine_is_omap_innovator())
 883                         innovator_fpga_socket_power(0);
 884                 else if (machine_is_omap_h2())
 885                         tps65010_set_gpio_out_value(GPIO3, LOW);
 886                 else if (machine_is_omap_h3())
 887                         tps65010_set_gpio_out_value(GPIO4, LOW);
 888                 else if (cpu_is_omap24xx()) {
 889                         u16 reg = OMAP_MMC_READ(host->base, CON);
 890                         OMAP_MMC_WRITE(host->base, CON, reg & ~(1 << 11));
 891                 } else
 892                         if (host->power_pin >= 0)
 893                                 omap_set_gpio_dataout(host->power_pin, 0);
 894         }
 895 }
 896
 897 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 898 {
 899         struct mmc_omap_host *host = mmc_priv(mmc);
 900         int dsor;
 901         int realclock, i;
 902
 903         realclock = ios->clock;
 904
 905         if (ios->clock == 0)
 906                 dsor = 0;
 907         else {
 908                 int func_clk_rate = clk_get_rate(host->fclk);
 909
 910                 dsor = func_clk_rate / realclock;
 911                 if (dsor < 1)
 912                         dsor = 1;
 913
 914                 if (func_clk_rate / dsor > realclock)
 915                         dsor++;
 916
 917                 if (dsor > 250)
 918                         dsor = 250;
 919                 dsor++;
 920
 921                 if (ios->bus_width == MMC_BUS_WIDTH_4)
 922                         dsor |= 1 << 15;
 923         }
 924
 925         switch (ios->power_mode) {
 926         case MMC_POWER_OFF:
 927                 mmc_omap_power(host, 0);
 928                 break;
 929         case MMC_POWER_UP:
 930         case MMC_POWER_ON:
 931                 mmc_omap_power(host, 1);
 932                 dsor |= 1<<11;
 933                 break;
 934         }
 935
 936         host->bus_mode = ios->bus_mode;
 937         host->hw_bus_mode = host->bus_mode;
 938
 939         clk_enable(host->fclk);
 940
 941         /* On insanely high arm_per frequencies something sometimes
 942          * goes somehow out of sync, and the POW bit is not being set,
 943          * which results in the while loop below getting stuck.
 944          * Writing to the CON register twice seems to do the trick. */
 945         for (i = 0; i < 2; i++)
 946                 OMAP_MMC_WRITE(host->base, CON, dsor);
 947         if (ios->power_mode == MMC_POWER_UP) {
 948                 /* Send clock cycles, poll completion */
 949                 OMAP_MMC_WRITE(host->base, IE, 0);
 950                 OMAP_MMC_WRITE(host->base, STAT, 0xffff);
 951                 OMAP_MMC_WRITE(host->base, CMD, 1<<7);
 952                 while (0 == (OMAP_MMC_READ(host->base, STAT) & 1));
 953                 OMAP_MMC_WRITE(host->base, STAT, 1);
 954         }
 955         clk_disable(host->fclk);
 956 }
 957
 958 static int mmc_omap_get_ro(struct mmc_host *mmc)
 959 {
 960         struct mmc_omap_host *host = mmc_priv(mmc);
 961
 962         return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
 963 }
 964
 965 static struct mmc_host_ops mmc_omap_ops = {
 966         .request        = mmc_omap_request,
 967         .set_ios        = mmc_omap_set_ios,
 968         .get_ro         = mmc_omap_get_ro,
 969 };
 970
 971 static int __init mmc_omap_probe(struct platform_device *pdev)
 972 {
 973         struct omap_mmc_conf *minfo = pdev->dev.platform_data;
 974         struct mmc_host *mmc;
 975         struct mmc_omap_host *host = NULL;
 976         int ret = 0;
 977
 978         if (platform_get_resource(pdev, IORESOURCE_MEM, 0) ||
 979                         platform_get_irq(pdev, IORESOURCE_IRQ, 0)) {
 980                 dev_err(&pdev->dev, "mmc_omap_probe: invalid resource type\n");
 981                 return -ENODEV;
 982         }
 983
 984         if (!request_mem_region(pdev->resource[0].start,
 985                                 pdev->resource[0].end - pdev->resource[0].start + 1,
 986                                 pdev->name)) {
 987                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 988                 return -EBUSY;
 989         }
 990
 991         mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
 992         if (!mmc) {
 993                 ret = -ENOMEM;
 994                 goto out;
 995         }
 996
 997         host = mmc_priv(mmc);
 998         host->mmc = mmc;
 999
1000         spin_lock_init(&host->dma_lock);
1001         init_timer(&host->dma_timer);
1002         host->dma_timer.function = mmc_omap_dma_timer;
1003         host->dma_timer.data = (unsigned long) host;
1004
1005         host->id = pdev->id;
1006
1007         if (cpu_is_omap24xx()) {
1008                 host->iclk = clk_get(&pdev->dev, "mmc_ick");
1009                 if (IS_ERR(host->iclk))
1010                         goto out;
1011                 clk_enable(host->iclk);
1012         }
1013
1014         if (!cpu_is_omap24xx())
1015                 host->fclk = clk_get(&pdev->dev, "mmc_ck");
1016         else
1017                 host->fclk = clk_get(&pdev->dev, "mmc_fck");
1018
1019         if (IS_ERR(host->fclk)) {
1020                 ret = PTR_ERR(host->fclk);
1021                 goto out;
1022         }
1023
1024         /* REVISIT:
1025          * Also, use minfo->cover to decide how to manage
1026          * the card detect sensing.
1027          */
1028         host->power_pin = minfo->power_pin;
1029         host->switch_pin = minfo->switch_pin;
1030         host->wp_pin = minfo->wp_pin;
1031         host->use_dma = 1;
1032         host->dma_ch = -1;
1033
1034         host->irq = pdev->resource[1].start;
1035         host->base = ioremap(pdev->res.start, SZ_4K);
1036         if (!host->base) {
1037                 ret = -ENOMEM;
1038                 goto out;
1039         }
1040
1041          if (minfo->wire4)
1042                  mmc->caps |= MMC_CAP_4_BIT_DATA;
1043
1044         mmc->ops = &mmc_omap_ops;
1045         mmc->f_min = 400000;
1046         mmc->f_max = 24000000;
1047         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1048
1049         /* Use scatterlist DMA to reduce per-transfer costs.
1050          * NOTE max_seg_size assumption that small blocks aren't
1051          * normally used (except e.g. for reading SD registers).
1052          */
1053         mmc->max_phys_segs = 32;
1054         mmc->max_hw_segs = 32;
1055         mmc->max_sectors = 256; /* NBLK max 11-bits, OMAP also limited by DMA */
1056         mmc->max_seg_size = mmc->max_sectors * 512;
1057
1058         if (host->power_pin >= 0) {
1059                 if ((ret = omap_request_gpio(host->power_pin)) != 0) {
1060                         dev_err(mmc_dev(host->mmc), "Unable to get GPIO
1061                                         pin for MMC power\n");
1062                         goto out;
1063                 }
1064                 omap_set_gpio_direction(host->power_pin, 0);
1065         }
1066
1067         ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1068         if (ret)
1069                 goto out;
1070
1071         host->dev = &pdev->dev;
1072         platform_set_drvdata(pdev, host);
1073
1074         mmc_add_host(mmc);
1075
1076         if (host->switch_pin >= 0) {
1077                 INIT_WORK(&host->switch_work, mmc_omap_switch_handler, host);
1078                 init_timer(&host->switch_timer);
1079                 host->switch_timer.function = mmc_omap_switch_timer;
1080                 host->switch_timer.data = (unsigned long) host;
1081                 if (omap_request_gpio(host->switch_pin) != 0) {
1082                         dev_warn(mmc_dev(host->mmc), "Unable to get GPIO pin for MMC cover switch\n");
1083                         host->switch_pin = -1;
1084                         goto no_switch;
1085                 }
1086
1087                 omap_set_gpio_direction(host->switch_pin, 1);
1088                 ret = request_irq(OMAP_GPIO_IRQ(host->switch_pin),
1089                                   mmc_omap_switch_irq, SA_TRIGGER_RISING, DRIVER_NAME, host);
1090                 if (ret) {
1091                         dev_warn(mmc_dev(host->mmc), "Unable to get IRQ for MMC cover switch\n");
1092                         omap_free_gpio(host->switch_pin);
1093                         host->switch_pin = -1;
1094                         goto no_switch;
1095                 }
1096                 ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
1097                 if (ret == 0) {
1098                         ret = device_create_file(&pdev->dev, &dev_attr_enable_poll);
1099                         if (ret != 0)
1100                                 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1101                 }
1102                 if (ret) {
1103                         dev_wan(mmc_dev(host->mmc), "Unable to create sysfs attributes\n");
1104                         free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1105                         omap_free_gpio(host->switch_pin);
1106                         host->switch_pin = -1;
1107                         goto no_switch;
1108                 }
1109                 if (mmc_omap_enable_poll && mmc_omap_cover_is_open(host))
1110                         schedule_work(&host->switch_work);
1111         }
1112
1113 no_switch:
1114         return 0;
1115
1116 out:
1117         /* FIXME: Free other resources too. */
1118         if (host) {
1119                 if (host->iclk && !IS_ERR(host->iclk))
1120                         clk_put(host->iclk);
1121                 if (host->fclk && !IS_ERR(host->fclk))
1122                         clk_put(host->fclk);
1123                 mmc_free_host(host->mmc);
1124         }
1125         return ret;
1126 }
1127
1128 static int mmc_omap_remove(struct platform_device *pdev)
1129 {
1130         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1131
1132         platform_set_drvdata(pdev, NULL);
1133
1134         if (host) {
1135                 mmc_remove_host(host->mmc);
1136                 free_irq(host->irq, host);
1137
1138                 if (host->power_pin >= 0)
1139                         omap_free_gpio(host->power_pin);
1140                 if (host->switch_pin >= 0) {
1141                         device_remove_file(&pdev->dev, &dev_attr_enable_poll);
1142                         device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1143                         free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1144                         omap_free_gpio(host->switch_pin);
1145                         host->switch_pin = -1;
1146                         del_timer_sync(&host->switch_timer);
1147                         flush_scheduled_work();
1148                 }
1149                 if (host->iclk && !IS_ERR(host->iclk))
1150                         clk_put(host->iclk);
1151                 if (host->fclk && !IS_ERR(host->fclk))
1152                         clk_put(host->fclk);
1153                 mmc_free_host(host->mmc);
1154         }
1155
1156         release_mem_region(pdev->resource[0].start,
1157                         pdev->resource[0].end - pdev->resource[0].start + 1);
1158
1159         return 0;
1160 }
1161
1162 #ifdef CONFIG_PM
1163 static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1164 {
1165         int ret = 0;
1166         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1167
1168         if (host && host->suspended)
1169                 return 0;
1170
1171         if (host) {
1172                 ret = mmc_suspend_host(host->mmc, mesg);
1173                 if (ret == 0)
1174                         host->suspended = 1;
1175         }
1176         return ret;
1177 }
1178
1179 static int mmc_omap_resume(struct platform_device *pdev)
1180 {
1181         int ret = 0;
1182         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1183
1184         if (host && !host->suspended)
1185                 return 0;
1186
1187         if (host) {
1188                 ret = mmc_resume_host(host->mmc);
1189                 if (ret == 0)
1190                         host->suspended = 0;
1191         }
1192
1193         return ret;
1194 }
1195 #else
1196 #define mmc_omap_suspend        NULL
1197 #define mmc_omap_resume         NULL
1198 #endif
1199
1200 static struct platform_driver mmc_omap_driver = {
1201         .probe          = mmc_omap_probe,
1202         .remove         = mmc_omap_remove,
1203         .suspend        = mmc_omap_suspend,
1204         .resume         = mmc_omap_resume,
1205         .driver         = {
1206                 .name   = DRIVER_NAME,
1207         },
1208 };
1209
1210 static int __init mmc_omap_init(void)
1211 {
1212         return platform_driver_register(&mmc_omap_driver);
1213 }
1214
1215 static void __exit mmc_omap_exit(void)
1216 {
1217         platform_driver_unregister(&mmc_omap_driver);
1218 }
1219
1220 module_init(mmc_omap_init);
1221 module_exit(mmc_omap_exit);
1222
1223 MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1224 MODULE_LICENSE("GPL");
1225 MODULE_ALIAS(DRIVER_NAME);
1226 MODULE_AUTHOR("Juha Yrjölä");