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   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         struct resource         *res;
  65         void __iomem            *base;
  66         int                     irq;
  67         unsigned char           bus_mode;
  68         unsigned char           hw_bus_mode;
  69
  70         unsigned int            sg_len;
  71         int                     sg_idx;
  72         u16 *                   buffer;
  73         u32                     buffer_bytes_left;
  74         u32                     total_bytes_left;
  75
  76         unsigned                use_dma:1;
  77         unsigned                brs_received:1, dma_done:1;
  78         unsigned                dma_is_read:1;
  79         unsigned                dma_in_use:1;
  80         int                     dma_ch;
  81         spinlock_t              dma_lock;
  82         struct timer_list       dma_timer;
  83         unsigned                dma_len;
  84
  85         short                   power_pin;
  86         short                   wp_pin;
  87
  88         int                     switch_pin;
  89         struct work_struct      switch_work;
  90         struct timer_list       switch_timer;
  91         int                     switch_last_state;
  92 };
  93
  94 static inline int
  95 mmc_omap_cover_is_open(struct mmc_omap_host *host)
  96 {
  97         if (host->switch_pin < 0)
  98                 return 0;
  99         return omap_get_gpio_datain(host->switch_pin);
 100 }
 101
 102 static ssize_t
 103 mmc_omap_show_cover_switch(struct device *dev,
 104         struct device_attribute *attr, char *buf)
 105 {
 106         struct mmc_omap_host *host = dev_get_drvdata(dev);
 107
 108         return sprintf(buf, "%s\n", mmc_omap_cover_is_open(host) ? "open" :
 109                         "closed");
 110 }
 111
 112 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
 113
 114 static ssize_t
 115 mmc_omap_show_enable_poll(struct device *dev,
 116         struct device_attribute *attr, char *buf)
 117 {
 118         return snprintf(buf, PAGE_SIZE, "%d\n", mmc_omap_enable_poll);
 119 }
 120
 121 static ssize_t
 122 mmc_omap_store_enable_poll(struct device *dev,
 123         struct device_attribute *attr, const char *buf,
 124         size_t size)
 125 {
 126         int enable_poll;
 127
 128         if (sscanf(buf, "%10d", &enable_poll) != 1)
 129                 return -EINVAL;
 130
 131         if (enable_poll != mmc_omap_enable_poll) {
 132                 struct mmc_omap_host *host = dev_get_drvdata(dev);
 133
 134                 mmc_omap_enable_poll = enable_poll;
 135                 if (enable_poll && host->switch_pin >= 0)
 136                         schedule_work(&host->switch_work);
 137         }
 138         return size;
 139 }
 140
 141 static DEVICE_ATTR(enable_poll, 0664,
 142                    mmc_omap_show_enable_poll, mmc_omap_store_enable_poll);
 143
 144 static void
 145 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
 146 {
 147         u32 cmdreg;
 148         u32 resptype;
 149         u32 cmdtype;
 150
 151         host->cmd = cmd;
 152
 153         resptype = 0;
 154         cmdtype = 0;
 155
 156         /* Our hardware needs to know exact type */
 157         switch (RSP_TYPE(mmc_resp_type(cmd))) {
 158         case RSP_TYPE(MMC_RSP_R1):
 159                 /* resp 1, resp 1b */
 160                 resptype = 1;
 161                 break;
 162         case RSP_TYPE(MMC_RSP_R2):
 163                 resptype = 2;
 164                 break;
 165         case RSP_TYPE(MMC_RSP_R3):
 166                 resptype = 3;
 167                 break;
 168         default:
 169                 break;
 170         }
 171
 172         if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
 173                 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
 174         } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
 175                 cmdtype = OMAP_MMC_CMDTYPE_BC;
 176         } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
 177                 cmdtype = OMAP_MMC_CMDTYPE_BCR;
 178         } else {
 179                 cmdtype = OMAP_MMC_CMDTYPE_AC;
 180         }
 181
 182         cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
 183
 184         if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
 185                 cmdreg |= 1 << 6;
 186
 187         if (cmd->flags & MMC_RSP_BUSY)
 188                 cmdreg |= 1 << 11;
 189
 190         if (host->data && !(host->data->flags & MMC_DATA_WRITE))
 191                 cmdreg |= 1 << 15;
 192
 193         clk_enable(host->fclk);
 194
 195         OMAP_MMC_WRITE(host->base, CTO, 200);
 196         OMAP_MMC_WRITE(host->base, ARGL, cmd->arg & 0xffff);
 197         OMAP_MMC_WRITE(host->base, ARGH, cmd->arg >> 16);
 198         OMAP_MMC_WRITE(host->base, IE,
 199                        OMAP_MMC_STAT_A_EMPTY    | OMAP_MMC_STAT_A_FULL    |
 200                        OMAP_MMC_STAT_CMD_CRC    | OMAP_MMC_STAT_CMD_TOUT  |
 201                        OMAP_MMC_STAT_DATA_CRC   | OMAP_MMC_STAT_DATA_TOUT |
 202                        OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR  |
 203                        OMAP_MMC_STAT_END_OF_DATA);
 204         OMAP_MMC_WRITE(host->base, CMD, cmdreg);
 205 }
 206
 207 static void
 208 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
 209 {
 210         if (host->dma_in_use) {
 211                 enum dma_data_direction dma_data_dir;
 212
 213                 BUG_ON(host->dma_ch < 0);
 214                 if (data->error != MMC_ERR_NONE)
 215                         omap_stop_dma(host->dma_ch);
 216                 /* Release DMA channel lazily */
 217                 mod_timer(&host->dma_timer, jiffies + HZ);
 218                 if (data->flags & MMC_DATA_WRITE)
 219                         dma_data_dir = DMA_TO_DEVICE;
 220                 else
 221                         dma_data_dir = DMA_FROM_DEVICE;
 222                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
 223                              dma_data_dir);
 224         }
 225         host->data = NULL;
 226         host->sg_len = 0;
 227         clk_disable(host->fclk);
 228
 229         /* NOTE:  MMC layer will sometimes poll-wait CMD13 next, issuing
 230          * dozens of requests until the card finishes writing data.
 231          * It'd be cheaper to just wait till an EOFB interrupt arrives...
 232          */
 233
 234         if (!data->stop) {
 235                 host->mrq = NULL;
 236                 mmc_request_done(host->mmc, data->mrq);
 237                 return;
 238         }
 239
 240         mmc_omap_start_command(host, data->stop);
 241 }
 242
 243 static void
 244 mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
 245 {
 246         unsigned long flags;
 247         int done;
 248
 249         if (!host->dma_in_use) {
 250                 mmc_omap_xfer_done(host, data);
 251                 return;
 252         }
 253         done = 0;
 254         spin_lock_irqsave(&host->dma_lock, flags);
 255         if (host->dma_done)
 256                 done = 1;
 257         else
 258                 host->brs_received = 1;
 259         spin_unlock_irqrestore(&host->dma_lock, flags);
 260         if (done)
 261                 mmc_omap_xfer_done(host, data);
 262 }
 263
 264 static void
 265 mmc_omap_dma_timer(unsigned long data)
 266 {
 267         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 268
 269         BUG_ON(host->dma_ch < 0);
 270         omap_free_dma(host->dma_ch);
 271         host->dma_ch = -1;
 272 }
 273
 274 static void
 275 mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
 276 {
 277         unsigned long flags;
 278         int done;
 279
 280         done = 0;
 281         spin_lock_irqsave(&host->dma_lock, flags);
 282         if (host->brs_received)
 283                 done = 1;
 284         else
 285                 host->dma_done = 1;
 286         spin_unlock_irqrestore(&host->dma_lock, flags);
 287         if (done)
 288                 mmc_omap_xfer_done(host, data);
 289 }
 290
 291 static void
 292 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
 293 {
 294         host->cmd = NULL;
 295
 296         if (cmd->flags & MMC_RSP_PRESENT) {
 297                 if (cmd->flags & MMC_RSP_136) {
 298                         /* response type 2 */
 299                         cmd->resp[3] =
 300                                 OMAP_MMC_READ(host->base, RSP0) |
 301                                 (OMAP_MMC_READ(host->base, RSP1) << 16);
 302                         cmd->resp[2] =
 303                                 OMAP_MMC_READ(host->base, RSP2) |
 304                                 (OMAP_MMC_READ(host->base, RSP3) << 16);
 305                         cmd->resp[1] =
 306                                 OMAP_MMC_READ(host->base, RSP4) |
 307                                 (OMAP_MMC_READ(host->base, RSP5) << 16);
 308                         cmd->resp[0] =
 309                                 OMAP_MMC_READ(host->base, RSP6) |
 310                                 (OMAP_MMC_READ(host->base, RSP7) << 16);
 311                 } else {
 312                         /* response types 1, 1b, 3, 4, 5, 6 */
 313                         cmd->resp[0] =
 314                                 OMAP_MMC_READ(host->base, RSP6) |
 315                                 (OMAP_MMC_READ(host->base, RSP7) << 16);
 316                 }
 317         }
 318
 319         if (host->data == NULL || cmd->error != MMC_ERR_NONE) {
 320                 host->mrq = NULL;
 321                 clk_disable(host->fclk);
 322                 mmc_request_done(host->mmc, cmd->mrq);
 323         }
 324 }
 325
 326 /* PIO only */
 327 static void
 328 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 329 {
 330         struct scatterlist *sg;
 331
 332         sg = host->data->sg + host->sg_idx;
 333         host->buffer_bytes_left = sg->length;
 334         host->buffer = page_address(sg->page) + sg->offset;
 335         if (host->buffer_bytes_left > host->total_bytes_left)
 336                 host->buffer_bytes_left = host->total_bytes_left;
 337 }
 338
 339 /* PIO only */
 340 static void
 341 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 342 {
 343         int n;
 344
 345         if (host->buffer_bytes_left == 0) {
 346                 host->sg_idx++;
 347                 BUG_ON(host->sg_idx == host->sg_len);
 348                 mmc_omap_sg_to_buf(host);
 349         }
 350         n = 64;
 351         if (n > host->buffer_bytes_left)
 352                 n = host->buffer_bytes_left;
 353         host->buffer_bytes_left -= n;
 354         host->total_bytes_left -= n;
 355         host->data->bytes_xfered += n;
 356
 357         if (write) {
 358                 __raw_writesw(host->base + OMAP_MMC_REG_DATA, host->buffer, n);
 359         } else {
 360                 __raw_readsw(host->base + OMAP_MMC_REG_DATA, host->buffer, n);
 361         }
 362 }
 363
 364 static inline void mmc_omap_report_irq(u16 status)
 365 {
 366         static const char *mmc_omap_status_bits[] = {
 367                 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
 368                 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
 369         };
 370         int i, c = 0;
 371
 372         for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
 373                 if (status & (1 << i)) {
 374                         if (c)
 375                                 printk(" ");
 376                         printk("%s", mmc_omap_status_bits[i]);
 377                         c++;
 378                 }
 379 }
 380
 381 static irqreturn_t mmc_omap_irq(int irq, void *dev_id, struct pt_regs *regs)
 382 {
 383         struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
 384         u16 status;
 385         int end_command;
 386         int end_transfer;
 387         int transfer_error;
 388
 389         if (host->cmd == NULL && host->data == NULL) {
 390                 status = OMAP_MMC_READ(host->base, STAT);
 391                 dev_info(mmc_dev(host->mmc),"spurious irq 0x%04x\n", status);
 392                 if (status != 0) {
 393                         OMAP_MMC_WRITE(host->base, STAT, status);
 394                         OMAP_MMC_WRITE(host->base, IE, 0);
 395                 }
 396                 return IRQ_HANDLED;
 397         }
 398
 399         end_command = 0;
 400         end_transfer = 0;
 401         transfer_error = 0;
 402
 403         while ((status = OMAP_MMC_READ(host->base, STAT)) != 0) {
 404                 OMAP_MMC_WRITE(host->base, STAT, status);
 405 #ifdef CONFIG_MMC_DEBUG
 406                 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
 407                         status, host->cmd != NULL ? host->cmd->opcode : -1);
 408                 mmc_omap_report_irq(status);
 409                 printk("\n");
 410 #endif
 411                 if (host->total_bytes_left) {
 412                         if ((status & OMAP_MMC_STAT_A_FULL) ||
 413                             (status & OMAP_MMC_STAT_END_OF_DATA))
 414                                 mmc_omap_xfer_data(host, 0);
 415                         if (status & OMAP_MMC_STAT_A_EMPTY)
 416                                 mmc_omap_xfer_data(host, 1);
 417                 }
 418
 419                 if (status & OMAP_MMC_STAT_END_OF_DATA) {
 420                         end_transfer = 1;
 421                 }
 422
 423                 if (status & OMAP_MMC_STAT_DATA_TOUT) {
 424                         dev_dbg(mmc_dev(host->mmc), "data timeout\n");
 425                         if (host->data) {
 426                                 host->data->error |= MMC_ERR_TIMEOUT;
 427                                 transfer_error = 1;
 428                         }
 429                 }
 430
 431                 if (status & OMAP_MMC_STAT_DATA_CRC) {
 432                         if (host->data) {
 433                                 host->data->error |= MMC_ERR_BADCRC;
 434                                 dev_dbg(mmc_dev(host->mmc),
 435                                          "data CRC error, bytes left %d\n",
 436                                         host->total_bytes_left);
 437                                 transfer_error = 1;
 438                         } else {
 439                                 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
 440                         }
 441                 }
 442
 443                 if (status & OMAP_MMC_STAT_CMD_TOUT) {
 444                         /* Timeouts are routine with some commands */
 445                         if (host->cmd) {
 446                                 if (host->cmd->opcode != MMC_ALL_SEND_CID &&
 447                                                 host->cmd->opcode !=
 448                                                 MMC_SEND_OP_COND &&
 449                                                 host->cmd->opcode !=
 450                                                 MMC_APP_CMD &&
 451                                                 !mmc_omap_cover_is_open(host))
 452                                         dev_err(mmc_dev(host->mmc),
 453                                                 "command timeout, CMD %d\n",
 454                                                 host->cmd->opcode);
 455                                 host->cmd->error = MMC_ERR_TIMEOUT;
 456                                 end_command = 1;
 457                         }
 458                 }
 459
 460                 if (status & OMAP_MMC_STAT_CMD_CRC) {
 461                         if (host->cmd) {
 462                                 dev_err(mmc_dev(host->mmc),
 463                                         "command CRC error (CMD%d, arg 0x%08x)\n",
 464                                         host->cmd->opcode, host->cmd->arg);
 465                                 host->cmd->error = MMC_ERR_BADCRC;
 466                                 end_command = 1;
 467                         } else
 468                                 dev_err(mmc_dev(host->mmc),
 469                                         "command CRC error without cmd?\n");
 470                 }
 471
 472                 if (status & OMAP_MMC_STAT_CARD_ERR) {
 473                         if (host->cmd && host->cmd->opcode == MMC_STOP_TRANSMISSION) {
 474                                 u32 response = OMAP_MMC_READ(host->base, RSP6)
 475                                         | (OMAP_MMC_READ(host->base, RSP7) << 16);
 476                                 /* STOP sometimes sets must-ignore bits */
 477                                 if (!(response & (R1_CC_ERROR
 478                                                                 | R1_ILLEGAL_COMMAND
 479                                                                 | R1_COM_CRC_ERROR))) {
 480                                         end_command = 1;
 481                                         continue;
 482                                 }
 483                         }
 484
 485                         dev_dbg(mmc_dev(host->mmc), "card status error (CMD%d)\n",
 486                                 host->cmd->opcode);
 487                         if (host->cmd) {
 488                                 host->cmd->error = MMC_ERR_FAILED;
 489                                 end_command = 1;
 490                         }
 491                         if (host->data) {
 492                                 host->data->error = MMC_ERR_FAILED;
 493                                 transfer_error = 1;
 494                         }
 495                 }
 496
 497                 /*
 498                  * NOTE: On 1610 the END_OF_CMD may come too early when
 499                  * starting a write
 500                  */
 501                 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
 502                     (!(status & OMAP_MMC_STAT_A_EMPTY))) {
 503                         end_command = 1;
 504                 }
 505         }
 506
 507         if (end_command) {
 508                 mmc_omap_cmd_done(host, host->cmd);
 509         }
 510         if (transfer_error)
 511                 mmc_omap_xfer_done(host, host->data);
 512         else if (end_transfer)
 513                 mmc_omap_end_of_data(host, host->data);
 514
 515         return IRQ_HANDLED;
 516 }
 517
 518 static irqreturn_t mmc_omap_switch_irq(int irq, void *dev_id, struct pt_regs *regs)
 519 {
 520         struct mmc_omap_host *host = (struct mmc_omap_host *) dev_id;
 521
 522         schedule_work(&host->switch_work);
 523
 524         return IRQ_HANDLED;
 525 }
 526
 527 static void mmc_omap_switch_timer(unsigned long arg)
 528 {
 529         struct mmc_omap_host *host = (struct mmc_omap_host *) arg;
 530
 531         schedule_work(&host->switch_work);
 532 }
 533
 534 /* FIXME: Handle card insertion and removal properly. Maybe use a mask
 535  * for MMC state? */
 536 static void mmc_omap_switch_callback(unsigned long data, u8 mmc_mask)
 537 {
 538 }
 539
 540 static void mmc_omap_switch_handler(void *data)
 541 {
 542         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 543         struct mmc_card *card;
 544         static int complained = 0;
 545         int cards = 0, cover_open;
 546
 547         if (host->switch_pin == -1)
 548                 return;
 549         cover_open = mmc_omap_cover_is_open(host);
 550         if (cover_open != host->switch_last_state) {
 551                 kobject_uevent(&host->dev->kobj, KOBJ_CHANGE);
 552                 host->switch_last_state = cover_open;
 553         }
 554         mmc_detect_change(host->mmc, 0);
 555         list_for_each_entry(card, &host->mmc->cards, node) {
 556                 if (mmc_card_present(card))
 557                         cards++;
 558         }
 559         if (mmc_omap_cover_is_open(host)) {
 560                 if (!complained) {
 561                         dev_info(mmc_dev(host->mmc), "cover is open");
 562                         complained = 1;
 563                 }
 564                 if (mmc_omap_enable_poll)
 565                         mod_timer(&host->switch_timer, jiffies +
 566                                 msecs_to_jiffies(OMAP_MMC_SWITCH_POLL_DELAY));
 567         } else {
 568                 complained = 0;
 569         }
 570 }
 571
 572 /* Prepare to transfer the next segment of a scatterlist */
 573 static void
 574 mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
 575 {
 576         int dma_ch = host->dma_ch;
 577         unsigned long data_addr;
 578         u16 buf, frame;
 579         u32 count;
 580         struct scatterlist *sg = &data->sg[host->sg_idx];
 581         int src_port = 0;
 582         int dst_port = 0;
 583         int sync_dev = 0;
 584
 585         data_addr = io_v2p((u32) host->base) + OMAP_MMC_REG_DATA;
 586         frame = data->blksz;
 587         count = sg_dma_len(sg);
 588
 589         if ((data->blocks == 1) && (count > data->blksz))
 590                 count = frame;
 591
 592         host->dma_len = count;
 593
 594         /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
 595          * Use 16 or 32 word frames when the blocksize is at least that large.
 596          * Blocksize is usually 512 bytes; but not for some SD reads.
 597          */
 598         if (cpu_is_omap15xx() && frame > 32)
 599                 frame = 32;
 600         else if (frame > 64)
 601                 frame = 64;
 602         count /= frame;
 603         frame >>= 1;
 604
 605         if (!(data->flags & MMC_DATA_WRITE)) {
 606                 buf = 0x800f | ((frame - 1) << 8);
 607
 608                 if (cpu_class_is_omap1()) {
 609                         src_port = OMAP_DMA_PORT_TIPB;
 610                         dst_port = OMAP_DMA_PORT_EMIFF;
 611                 }
 612                 if (cpu_is_omap24xx())
 613                         sync_dev = OMAP24XX_DMA_MMC1_RX;
 614
 615                 omap_set_dma_src_params(dma_ch, src_port,
 616                                         OMAP_DMA_AMODE_CONSTANT,
 617                                         data_addr, 0, 0);
 618                 omap_set_dma_dest_params(dma_ch, dst_port,
 619                                          OMAP_DMA_AMODE_POST_INC,
 620                                          sg_dma_address(sg), 0, 0);
 621                 omap_set_dma_dest_data_pack(dma_ch, 1);
 622                 omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
 623         } else {
 624                 buf = 0x0f80 | ((frame - 1) << 0);
 625
 626                 if (cpu_class_is_omap1()) {
 627                         src_port = OMAP_DMA_PORT_EMIFF;
 628                         dst_port = OMAP_DMA_PORT_TIPB;
 629                 }
 630                 if (cpu_is_omap24xx())
 631                         sync_dev = OMAP24XX_DMA_MMC1_TX;
 632
 633                 omap_set_dma_dest_params(dma_ch, dst_port,
 634                                          OMAP_DMA_AMODE_CONSTANT,
 635                                          data_addr, 0, 0);
 636                 omap_set_dma_src_params(dma_ch, src_port,
 637                                         OMAP_DMA_AMODE_POST_INC,
 638                                         sg_dma_address(sg), 0, 0);
 639                 omap_set_dma_src_data_pack(dma_ch, 1);
 640                 omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
 641         }
 642
 643         /* Max limit for DMA frame count is 0xffff */
 644         if (unlikely(count > 0xffff))
 645                 BUG();
 646
 647         OMAP_MMC_WRITE(host->base, BUF, buf);
 648         omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
 649                                      frame, count, OMAP_DMA_SYNC_FRAME,
 650                                      sync_dev, 0);
 651 }
 652
 653 /* A scatterlist segment completed */
 654 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
 655 {
 656         struct mmc_omap_host *host = (struct mmc_omap_host *) data;
 657         struct mmc_data *mmcdat = host->data;
 658
 659         if (unlikely(host->dma_ch < 0)) {
 660                 dev_err(mmc_dev(host->mmc),
 661                         "DMA callback while DMA not enabled\n");
 662                 return;
 663         }
 664         /* FIXME: We really should do something to _handle_ the errors */
 665         if (ch_status & OMAP1_DMA_TOUT_IRQ) {
 666                 dev_err(mmc_dev(host->mmc),"DMA timeout\n");
 667                 return;
 668         }
 669         if (ch_status & OMAP_DMA_DROP_IRQ) {
 670                 dev_err(mmc_dev(host->mmc), "DMA sync error\n");
 671                 return;
 672         }
 673         if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
 674                 return;
 675         }
 676         mmcdat->bytes_xfered += host->dma_len;
 677         host->sg_idx++;
 678         if (host->sg_idx < host->sg_len) {
 679                 mmc_omap_prepare_dma(host, host->data);
 680                 omap_start_dma(host->dma_ch);
 681         } else
 682                 mmc_omap_dma_done(host, host->data);
 683 }
 684
 685 static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
 686 {
 687         const char *dev_name;
 688         int sync_dev, dma_ch, is_read, r;
 689
 690         is_read = !(data->flags & MMC_DATA_WRITE);
 691         del_timer_sync(&host->dma_timer);
 692         if (host->dma_ch >= 0) {
 693                 if (is_read == host->dma_is_read)
 694                         return 0;
 695                 omap_free_dma(host->dma_ch);
 696                 host->dma_ch = -1;
 697         }
 698
 699         if (is_read) {
 700                 if (host->id == 1) {
 701                         sync_dev = OMAP_DMA_MMC_RX;
 702                         dev_name = "MMC1 read";
 703                 } else {
 704                         sync_dev = OMAP_DMA_MMC2_RX;
 705                         dev_name = "MMC2 read";
 706                 }
 707         } else {
 708                 if (host->id == 1) {
 709                         sync_dev = OMAP_DMA_MMC_TX;
 710                         dev_name = "MMC1 write";
 711                 } else {
 712                         sync_dev = OMAP_DMA_MMC2_TX;
 713                         dev_name = "MMC2 write";
 714                 }
 715         }
 716         r = omap_request_dma(sync_dev, dev_name, mmc_omap_dma_cb,
 717                              host, &dma_ch);
 718         if (r != 0) {
 719                 dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
 720                 return r;
 721         }
 722         host->dma_ch = dma_ch;
 723         host->dma_is_read = is_read;
 724
 725         return 0;
 726 }
 727
 728 static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
 729 {
 730         u16 reg;
 731
 732         reg = OMAP_MMC_READ(host->base, SDIO);
 733         reg &= ~(1 << 5);
 734         OMAP_MMC_WRITE(host->base, SDIO, reg);
 735         /* Set maximum timeout */
 736         OMAP_MMC_WRITE(host->base, CTO, 0xff);
 737 }
 738
 739 static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
 740 {
 741         int timeout;
 742         u16 reg;
 743
 744         /* Convert ns to clock cycles by assuming 20MHz frequency
 745          * 1 cycle at 20MHz = 500 ns
 746          */
 747         timeout = req->data->timeout_clks + req->data->timeout_ns / 500;
 748
 749         /* Check if we need to use timeout multiplier register */
 750         reg = OMAP_MMC_READ(host->base, SDIO);
 751         if (timeout > 0xffff) {
 752                 reg |= (1 << 5);
 753                 timeout /= 1024;
 754         } else
 755                 reg &= ~(1 << 5);
 756         OMAP_MMC_WRITE(host->base, SDIO, reg);
 757         OMAP_MMC_WRITE(host->base, DTO, timeout);
 758 }
 759
 760 static void
 761 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
 762 {
 763         struct mmc_data *data = req->data;
 764         int i, use_dma, block_size;
 765         unsigned sg_len;
 766
 767         host->data = data;
 768         if (data == NULL) {
 769                 OMAP_MMC_WRITE(host->base, BLEN, 0);
 770                 OMAP_MMC_WRITE(host->base, NBLK, 0);
 771                 OMAP_MMC_WRITE(host->base, BUF, 0);
 772                 host->dma_in_use = 0;
 773                 set_cmd_timeout(host, req);
 774                 return;
 775         }
 776
 777
 778         block_size = data->blksz;
 779
 780         OMAP_MMC_WRITE(host->base, NBLK, data->blocks - 1);
 781         OMAP_MMC_WRITE(host->base, BLEN, block_size - 1);
 782         set_data_timeout(host, req);
 783
 784         /* cope with calling layer confusion; it issues "single
 785          * block" writes using multi-block scatterlists.
 786          */
 787         sg_len = (data->blocks == 1) ? 1 : data->sg_len;
 788
 789         /* Only do DMA for entire blocks */
 790         use_dma = host->use_dma;
 791         if (use_dma) {
 792                 for (i = 0; i < sg_len; i++) {
 793                         if ((data->sg[i].length % block_size) != 0) {
 794                                 use_dma = 0;
 795                                 break;
 796                         }
 797                 }
 798         }
 799
 800         host->sg_idx = 0;
 801         if (use_dma) {
 802                 if (mmc_omap_get_dma_channel(host, data) == 0) {
 803                         enum dma_data_direction dma_data_dir;
 804
 805                         if (data->flags & MMC_DATA_WRITE)
 806                                 dma_data_dir = DMA_TO_DEVICE;
 807                         else
 808                                 dma_data_dir = DMA_FROM_DEVICE;
 809
 810                         host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
 811                                                 sg_len, dma_data_dir);
 812                         host->total_bytes_left = 0;
 813                         mmc_omap_prepare_dma(host, req->data);
 814                         host->brs_received = 0;
 815                         host->dma_done = 0;
 816                         host->dma_in_use = 1;
 817                 } else
 818                         use_dma = 0;
 819         }
 820
 821         /* Revert to PIO? */
 822         if (!use_dma) {
 823                 OMAP_MMC_WRITE(host->base, BUF, 0x1f1f);
 824                 host->total_bytes_left = data->blocks * block_size;
 825                 host->sg_len = sg_len;
 826                 mmc_omap_sg_to_buf(host);
 827                 host->dma_in_use = 0;
 828         }
 829 }
 830
 831 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
 832 {
 833         struct mmc_omap_host *host = mmc_priv(mmc);
 834
 835         WARN_ON(host->mrq != NULL);
 836
 837         host->mrq = req;
 838
 839         /* only touch fifo AFTER the controller readies it */
 840         mmc_omap_prepare_data(host, req);
 841         mmc_omap_start_command(host, req->cmd);
 842         if (host->dma_in_use)
 843                 omap_start_dma(host->dma_ch);
 844 }
 845
 846 static void innovator_fpga_socket_power(int on)
 847 {
 848 #if defined(CONFIG_MACH_OMAP_INNOVATOR) && defined(CONFIG_ARCH_OMAP15XX)
 849
 850         if (on) {
 851                 fpga_write(fpga_read(OMAP1510_FPGA_POWER) | (1 << 3),
 852                      OMAP1510_FPGA_POWER);
 853         } else {
 854                 fpga_write(fpga_read(OMAP1510_FPGA_POWER) & ~(1 << 3),
 855                      OMAP1510_FPGA_POWER);
 856         }
 857 #endif
 858 }
 859
 860 /*
 861  * Turn the socket power on/off. Innovator uses FPGA, most boards
 862  * probably use GPIO.
 863  */
 864 static void mmc_omap_power(struct mmc_omap_host *host, int on)
 865 {
 866         if (on) {
 867                 if (machine_is_omap_innovator())
 868                         innovator_fpga_socket_power(1);
 869                 else if (machine_is_omap_h2())
 870                         tps65010_set_gpio_out_value(GPIO3, HIGH);
 871                 else if (machine_is_omap_h3())
 872                         /* GPIO 4 of TPS65010 sends SD_EN signal */
 873                         tps65010_set_gpio_out_value(GPIO4, HIGH);
 874                 else if (cpu_is_omap24xx()) {
 875                         u16 reg = OMAP_MMC_READ(host->base, CON);
 876                         OMAP_MMC_WRITE(host->base, CON, reg | (1 << 11));
 877                 } else
 878                         if (host->power_pin >= 0)
 879                                 omap_set_gpio_dataout(host->power_pin, 1);
 880         } else {
 881                 if (machine_is_omap_innovator())
 882                         innovator_fpga_socket_power(0);
 883                 else if (machine_is_omap_h2())
 884                         tps65010_set_gpio_out_value(GPIO3, LOW);
 885                 else if (machine_is_omap_h3())
 886                         tps65010_set_gpio_out_value(GPIO4, LOW);
 887                 else if (cpu_is_omap24xx()) {
 888                         u16 reg = OMAP_MMC_READ(host->base, CON);
 889                         OMAP_MMC_WRITE(host->base, CON, reg & ~(1 << 11));
 890                 } else
 891                         if (host->power_pin >= 0)
 892                                 omap_set_gpio_dataout(host->power_pin, 0);
 893         }
 894 }
 895
 896 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 897 {
 898         struct mmc_omap_host *host = mmc_priv(mmc);
 899         int dsor;
 900         int realclock, i;
 901
 902         realclock = ios->clock;
 903
 904         if (ios->clock == 0)
 905                 dsor = 0;
 906         else {
 907                 int func_clk_rate = clk_get_rate(host->fclk);
 908
 909                 dsor = func_clk_rate / realclock;
 910                 if (dsor < 1)
 911                         dsor = 1;
 912
 913                 if (func_clk_rate / dsor > realclock)
 914                         dsor++;
 915
 916                 if (dsor > 250)
 917                         dsor = 250;
 918                 dsor++;
 919
 920                 if (ios->bus_width == MMC_BUS_WIDTH_4)
 921                         dsor |= 1 << 15;
 922         }
 923
 924         switch (ios->power_mode) {
 925         case MMC_POWER_OFF:
 926                 mmc_omap_power(host, 0);
 927                 break;
 928         case MMC_POWER_UP:
 929         case MMC_POWER_ON:
 930                 mmc_omap_power(host, 1);
 931                 dsor |= 1<<11;
 932                 break;
 933         }
 934
 935         host->bus_mode = ios->bus_mode;
 936         host->hw_bus_mode = host->bus_mode;
 937
 938         clk_enable(host->fclk);
 939
 940         /* On insanely high arm_per frequencies something sometimes
 941          * goes somehow out of sync, and the POW bit is not being set,
 942          * which results in the while loop below getting stuck.
 943          * Writing to the CON register twice seems to do the trick. */
 944         for (i = 0; i < 2; i++)
 945                 OMAP_MMC_WRITE(host->base, CON, dsor);
 946         if (ios->power_mode == MMC_POWER_UP) {
 947                 /* Send clock cycles, poll completion */
 948                 OMAP_MMC_WRITE(host->base, IE, 0);
 949                 OMAP_MMC_WRITE(host->base, STAT, 0xffff);
 950                 OMAP_MMC_WRITE(host->base, CMD, 1<<7);
 951                 while (0 == (OMAP_MMC_READ(host->base, STAT) & 1));
 952                 OMAP_MMC_WRITE(host->base, STAT, 1);
 953         }
 954         clk_disable(host->fclk);
 955 }
 956
 957 static int mmc_omap_get_ro(struct mmc_host *mmc)
 958 {
 959         struct mmc_omap_host *host = mmc_priv(mmc);
 960
 961         return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
 962 }
 963
 964 static struct mmc_host_ops mmc_omap_ops = {
 965         .request        = mmc_omap_request,
 966         .set_ios        = mmc_omap_set_ios,
 967         .get_ro         = mmc_omap_get_ro,
 968 };
 969
 970 static int __init mmc_omap_probe(struct platform_device *pdev)
 971 {
 972         struct omap_mmc_conf *minfo = pdev->dev.platform_data;
 973         struct mmc_host *mmc;
 974         struct mmc_omap_host *host = NULL;
 975         struct resource *r;
 976         int ret = 0;
 977         int irq;
 978
 979         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 980         irq = platform_get_irq(pdev, 0);
 981         if (!r || irq < 0)
 982                 return -ENXIO;
 983
 984         r = request_mem_region(pdev->resource[0].start,
 985                                 pdev->resource[0].end - pdev->resource[0].start + 1,
 986                                pdev->name);
 987         if (!r)
 988                 return -EBUSY;
 989
 990         mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
 991         if (!mmc) {
 992                 ret = -ENOMEM;
 993                 goto out;
 994         }
 995
 996         host = mmc_priv(mmc);
 997         host->mmc = mmc;
 998
 999         spin_lock_init(&host->dma_lock);
1000         init_timer(&host->dma_timer);
1001         host->dma_timer.function = mmc_omap_dma_timer;
1002         host->dma_timer.data = (unsigned long) host;
1003
1004         host->id = pdev->id;
1005         host->res = r;
1006         host->irq = irq;
1007
1008         if (cpu_is_omap24xx()) {
1009                 host->iclk = clk_get(&pdev->dev, "mmc_ick");
1010                 if (IS_ERR(host->iclk))
1011                         goto out;
1012                 clk_enable(host->iclk);
1013         }
1014
1015         if (!cpu_is_omap24xx())
1016                 host->fclk = clk_get(&pdev->dev, "mmc_ck");
1017         else
1018                 host->fclk = clk_get(&pdev->dev, "mmc_fck");
1019
1020         if (IS_ERR(host->fclk)) {
1021                 ret = PTR_ERR(host->fclk);
1022                 goto out;
1023         }
1024
1025         /* REVISIT:
1026          * Also, use minfo->cover to decide how to manage
1027          * the card detect sensing.
1028          */
1029         host->power_pin = minfo->power_pin;
1030         host->switch_pin = minfo->switch_pin;
1031         host->wp_pin = minfo->wp_pin;
1032         host->use_dma = 1;
1033         host->dma_ch = -1;
1034
1035         host->irq = pdev->resource[1].start;
1036         host->base = (void __iomem*)IO_ADDRESS(r->start);
1037
1038         if (minfo->wire4)
1039                  mmc->caps |= MMC_CAP_4_BIT_DATA;
1040
1041         mmc->ops = &mmc_omap_ops;
1042         mmc->f_min = 400000;
1043         mmc->f_max = 24000000;
1044         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1045
1046         /* Use scatterlist DMA to reduce per-transfer costs.
1047          * NOTE max_seg_size assumption that small blocks aren't
1048          * normally used (except e.g. for reading SD registers).
1049          */
1050         mmc->max_phys_segs = 32;
1051         mmc->max_hw_segs = 32;
1052         mmc->max_sectors = 256; /* NBLK max 11-bits, OMAP also limited by DMA */
1053         mmc->max_seg_size = mmc->max_sectors * 512;
1054
1055         if (host->power_pin >= 0) {
1056                 if ((ret = omap_request_gpio(host->power_pin)) != 0) {
1057                         dev_err(mmc_dev(host->mmc),
1058                                 "Unable to get GPIO pin for MMC power\n");
1059                         goto out;
1060                 }
1061                 omap_set_gpio_direction(host->power_pin, 0);
1062         }
1063
1064         ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1065         if (ret)
1066                 goto out;
1067
1068         host->dev = &pdev->dev;
1069         platform_set_drvdata(pdev, host);
1070
1071         mmc_add_host(mmc);
1072
1073         if (host->switch_pin >= 0) {
1074                 INIT_WORK(&host->switch_work, mmc_omap_switch_handler, host);
1075                 init_timer(&host->switch_timer);
1076                 host->switch_timer.function = mmc_omap_switch_timer;
1077                 host->switch_timer.data = (unsigned long) host;
1078                 if (omap_request_gpio(host->switch_pin) != 0) {
1079                         dev_warn(mmc_dev(host->mmc), "Unable to get GPIO pin for MMC cover switch\n");
1080                         host->switch_pin = -1;
1081                         goto no_switch;
1082                 }
1083
1084                 omap_set_gpio_direction(host->switch_pin, 1);
1085                 ret = request_irq(OMAP_GPIO_IRQ(host->switch_pin),
1086                                   mmc_omap_switch_irq, SA_TRIGGER_RISING, DRIVER_NAME, host);
1087                 if (ret) {
1088                         dev_warn(mmc_dev(host->mmc), "Unable to get IRQ for MMC cover switch\n");
1089                         omap_free_gpio(host->switch_pin);
1090                         host->switch_pin = -1;
1091                         goto no_switch;
1092                 }
1093                 ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
1094                 if (ret == 0) {
1095                         ret = device_create_file(&pdev->dev, &dev_attr_enable_poll);
1096                         if (ret != 0)
1097                                 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1098                 }
1099                 if (ret) {
1100                         dev_warn(mmc_dev(host->mmc), "Unable to create sysfs attributes\n");
1101                         free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1102                         omap_free_gpio(host->switch_pin);
1103                         host->switch_pin = -1;
1104                         goto no_switch;
1105                 }
1106                 if (mmc_omap_enable_poll && mmc_omap_cover_is_open(host))
1107                         schedule_work(&host->switch_work);
1108         }
1109
1110 no_switch:
1111         return 0;
1112
1113 out:
1114         /* FIXME: Free other resources too. */
1115         if (host) {
1116                 if (host->iclk && !IS_ERR(host->iclk))
1117                         clk_put(host->iclk);
1118                 if (host->fclk && !IS_ERR(host->fclk))
1119                         clk_put(host->fclk);
1120                 mmc_free_host(host->mmc);
1121         }
1122         return ret;
1123 }
1124
1125 static int mmc_omap_remove(struct platform_device *pdev)
1126 {
1127         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1128
1129         platform_set_drvdata(pdev, NULL);
1130
1131         if (host) {
1132                 mmc_remove_host(host->mmc);
1133                 free_irq(host->irq, host);
1134
1135                 if (host->power_pin >= 0)
1136                         omap_free_gpio(host->power_pin);
1137                 if (host->switch_pin >= 0) {
1138                         device_remove_file(&pdev->dev, &dev_attr_enable_poll);
1139                         device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1140                         free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1141                         omap_free_gpio(host->switch_pin);
1142                         host->switch_pin = -1;
1143                         del_timer_sync(&host->switch_timer);
1144                         flush_scheduled_work();
1145                 }
1146                 if (host->iclk && !IS_ERR(host->iclk))
1147                         clk_put(host->iclk);
1148                 if (host->fclk && !IS_ERR(host->fclk))
1149                         clk_put(host->fclk);
1150                 mmc_free_host(host->mmc);
1151         }
1152
1153         release_mem_region(pdev->resource[0].start,
1154                         pdev->resource[0].end - pdev->resource[0].start + 1);
1155
1156         return 0;
1157 }
1158
1159 #ifdef CONFIG_PM
1160 static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1161 {
1162         int ret = 0;
1163         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1164
1165         if (host && host->suspended)
1166                 return 0;
1167
1168         if (host) {
1169                 ret = mmc_suspend_host(host->mmc, mesg);
1170                 if (ret == 0)
1171                         host->suspended = 1;
1172         }
1173         return ret;
1174 }
1175
1176 static int mmc_omap_resume(struct platform_device *pdev)
1177 {
1178         int ret = 0;
1179         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1180
1181         if (host && !host->suspended)
1182                 return 0;
1183
1184         if (host) {
1185                 ret = mmc_resume_host(host->mmc);
1186                 if (ret == 0)
1187                         host->suspended = 0;
1188         }
1189
1190         return ret;
1191 }
1192 #else
1193 #define mmc_omap_suspend        NULL
1194 #define mmc_omap_resume         NULL
1195 #endif
1196
1197 static struct platform_driver mmc_omap_driver = {
1198         .probe          = mmc_omap_probe,
1199         .remove         = mmc_omap_remove,
1200         .suspend        = mmc_omap_suspend,
1201         .resume         = mmc_omap_resume,
1202         .driver         = {
1203                 .name   = DRIVER_NAME,
1204         },
1205 };
1206
1207 static int __init mmc_omap_init(void)
1208 {
1209         return platform_driver_register(&mmc_omap_driver);
1210 }
1211
1212 static void __exit mmc_omap_exit(void)
1213 {
1214         platform_driver_unregister(&mmc_omap_driver);
1215 }
1216
1217 module_init(mmc_omap_init);
1218 module_exit(mmc_omap_exit);
1219
1220 MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1221 MODULE_LICENSE("GPL");
1222 MODULE_ALIAS(DRIVER_NAME);
1223 MODULE_AUTHOR("Juha Yrjölä");