git.oblomov.eu Git - linux-2.6/blob - drivers/mmc/host/sdhci.c

   1 /*
   2  *  linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
   3  *
   4  *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * Thanks to the following companies for their support:
  12  *
  13  *     - JMicron (hardware and technical support)
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/highmem.h>
  18 #include <linux/io.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include <linux/leds.h>
  23
  24 #include <linux/mmc/host.h>
  25
  26 #include "sdhci.h"
  27
  28 #define DRIVER_NAME "sdhci"
  29
  30 #define DBG(f, x...) \
  31         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  32
  33 static unsigned int debug_quirks = 0;
  34
  35 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  36 static void sdhci_finish_data(struct sdhci_host *);
  37
  38 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  39 static void sdhci_finish_command(struct sdhci_host *);
  40
  41 static void sdhci_dumpregs(struct sdhci_host *host)
  42 {
  43         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  44
  45         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  46                 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
  47                 readw(host->ioaddr + SDHCI_HOST_VERSION));
  48         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  49                 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
  50                 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
  51         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  52                 readl(host->ioaddr + SDHCI_ARGUMENT),
  53                 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
  54         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  55                 readl(host->ioaddr + SDHCI_PRESENT_STATE),
  56                 readb(host->ioaddr + SDHCI_HOST_CONTROL));
  57         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  58                 readb(host->ioaddr + SDHCI_POWER_CONTROL),
  59                 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
  60         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  61                 readb(host->ioaddr + SDHCI_WAKE_UP_CONTROL),
  62                 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
  63         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
  64                 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
  65                 readl(host->ioaddr + SDHCI_INT_STATUS));
  66         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
  67                 readl(host->ioaddr + SDHCI_INT_ENABLE),
  68                 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
  69         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
  70                 readw(host->ioaddr + SDHCI_ACMD12_ERR),
  71                 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
  72         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
  73                 readl(host->ioaddr + SDHCI_CAPABILITIES),
  74                 readl(host->ioaddr + SDHCI_MAX_CURRENT));
  75
  76         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
  77 }
  78
  79 /*****************************************************************************\
  80  *                                                                           *
  81  * Low level functions                                                       *
  82  *                                                                           *
  83 \*****************************************************************************/
  84
  85 static void sdhci_reset(struct sdhci_host *host, u8 mask)
  86 {
  87         unsigned long timeout;
  88
  89         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
  90                 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
  91                         SDHCI_CARD_PRESENT))
  92                         return;
  93         }
  94
  95         writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
  96
  97         if (mask & SDHCI_RESET_ALL)
  98                 host->clock = 0;
  99
 100         /* Wait max 100 ms */
 101         timeout = 100;
 102
 103         /* hw clears the bit when it's done */
 104         while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
 105                 if (timeout == 0) {
 106                         printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
 107                                 mmc_hostname(host->mmc), (int)mask);
 108                         sdhci_dumpregs(host);
 109                         return;
 110                 }
 111                 timeout--;
 112                 mdelay(1);
 113         }
 114 }
 115
 116 static void sdhci_init(struct sdhci_host *host)
 117 {
 118         u32 intmask;
 119
 120         sdhci_reset(host, SDHCI_RESET_ALL);
 121
 122         intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 123                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 124                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 125                 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
 126                 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
 127                 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE |
 128                 SDHCI_INT_ADMA_ERROR;
 129
 130         writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
 131         writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
 132 }
 133
 134 static void sdhci_activate_led(struct sdhci_host *host)
 135 {
 136         u8 ctrl;
 137
 138         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 139         ctrl |= SDHCI_CTRL_LED;
 140         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 141 }
 142
 143 static void sdhci_deactivate_led(struct sdhci_host *host)
 144 {
 145         u8 ctrl;
 146
 147         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 148         ctrl &= ~SDHCI_CTRL_LED;
 149         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 150 }
 151
 152 #ifdef CONFIG_LEDS_CLASS
 153 static void sdhci_led_control(struct led_classdev *led,
 154         enum led_brightness brightness)
 155 {
 156         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 157         unsigned long flags;
 158
 159         spin_lock_irqsave(&host->lock, flags);
 160
 161         if (brightness == LED_OFF)
 162                 sdhci_deactivate_led(host);
 163         else
 164                 sdhci_activate_led(host);
 165
 166         spin_unlock_irqrestore(&host->lock, flags);
 167 }
 168 #endif
 169
 170 /*****************************************************************************\
 171  *                                                                           *
 172  * Core functions                                                            *
 173  *                                                                           *
 174 \*****************************************************************************/
 175
 176 static void sdhci_read_block_pio(struct sdhci_host *host)
 177 {
 178         unsigned long flags;
 179         size_t blksize, len, chunk;
 180         u32 scratch;
 181         u8 *buf;
 182
 183         DBG("PIO reading\n");
 184
 185         blksize = host->data->blksz;
 186         chunk = 0;
 187
 188         local_irq_save(flags);
 189
 190         while (blksize) {
 191                 if (!sg_miter_next(&host->sg_miter))
 192                         BUG();
 193
 194                 len = min(host->sg_miter.length, blksize);
 195
 196                 blksize -= len;
 197                 host->sg_miter.consumed = len;
 198
 199                 buf = host->sg_miter.addr;
 200
 201                 while (len) {
 202                         if (chunk == 0) {
 203                                 scratch = readl(host->ioaddr + SDHCI_BUFFER);
 204                                 chunk = 4;
 205                         }
 206
 207                         *buf = scratch & 0xFF;
 208
 209                         buf++;
 210                         scratch >>= 8;
 211                         chunk--;
 212                         len--;
 213                 }
 214         }
 215
 216         sg_miter_stop(&host->sg_miter);
 217
 218         local_irq_restore(flags);
 219 }
 220
 221 static void sdhci_write_block_pio(struct sdhci_host *host)
 222 {
 223         unsigned long flags;
 224         size_t blksize, len, chunk;
 225         u32 scratch;
 226         u8 *buf;
 227
 228         DBG("PIO writing\n");
 229
 230         blksize = host->data->blksz;
 231         chunk = 0;
 232         scratch = 0;
 233
 234         local_irq_save(flags);
 235
 236         while (blksize) {
 237                 if (!sg_miter_next(&host->sg_miter))
 238                         BUG();
 239
 240                 len = min(host->sg_miter.length, blksize);
 241
 242                 blksize -= len;
 243                 host->sg_miter.consumed = len;
 244
 245                 buf = host->sg_miter.addr;
 246
 247                 while (len) {
 248                         scratch |= (u32)*buf << (chunk * 8);
 249
 250                         buf++;
 251                         chunk++;
 252                         len--;
 253
 254                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 255                                 writel(scratch, host->ioaddr + SDHCI_BUFFER);
 256                                 chunk = 0;
 257                                 scratch = 0;
 258                         }
 259                 }
 260         }
 261
 262         sg_miter_stop(&host->sg_miter);
 263
 264         local_irq_restore(flags);
 265 }
 266
 267 static void sdhci_transfer_pio(struct sdhci_host *host)
 268 {
 269         u32 mask;
 270
 271         BUG_ON(!host->data);
 272
 273         if (host->blocks == 0)
 274                 return;
 275
 276         if (host->data->flags & MMC_DATA_READ)
 277                 mask = SDHCI_DATA_AVAILABLE;
 278         else
 279                 mask = SDHCI_SPACE_AVAILABLE;
 280
 281         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 282                 if (host->data->flags & MMC_DATA_READ)
 283                         sdhci_read_block_pio(host);
 284                 else
 285                         sdhci_write_block_pio(host);
 286
 287                 host->blocks--;
 288                 if (host->blocks == 0)
 289                         break;
 290         }
 291
 292         DBG("PIO transfer complete.\n");
 293 }
 294
 295 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 296 {
 297         local_irq_save(*flags);
 298         return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
 299 }
 300
 301 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 302 {
 303         kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
 304         local_irq_restore(*flags);
 305 }
 306
 307 static int sdhci_adma_table_pre(struct sdhci_host *host,
 308         struct mmc_data *data)
 309 {
 310         int direction;
 311
 312         u8 *desc;
 313         u8 *align;
 314         dma_addr_t addr;
 315         dma_addr_t align_addr;
 316         int len, offset;
 317
 318         struct scatterlist *sg;
 319         int i;
 320         char *buffer;
 321         unsigned long flags;
 322
 323         /*
 324          * The spec does not specify endianness of descriptor table.
 325          * We currently guess that it is LE.
 326          */
 327
 328         if (data->flags & MMC_DATA_READ)
 329                 direction = DMA_FROM_DEVICE;
 330         else
 331                 direction = DMA_TO_DEVICE;
 332
 333         /*
 334          * The ADMA descriptor table is mapped further down as we
 335          * need to fill it with data first.
 336          */
 337
 338         host->align_addr = dma_map_single(mmc_dev(host->mmc),
 339                 host->align_buffer, 128 * 4, direction);
 340         if (dma_mapping_error(host->align_addr))
 341                 goto fail;
 342         BUG_ON(host->align_addr & 0x3);
 343
 344         host->sg_count = dma_map_sg(mmc_dev(host->mmc),
 345                 data->sg, data->sg_len, direction);
 346         if (host->sg_count == 0)
 347                 goto unmap_align;
 348
 349         desc = host->adma_desc;
 350         align = host->align_buffer;
 351
 352         align_addr = host->align_addr;
 353
 354         for_each_sg(data->sg, sg, host->sg_count, i) {
 355                 addr = sg_dma_address(sg);
 356                 len = sg_dma_len(sg);
 357
 358                 /*
 359                  * The SDHCI specification states that ADMA
 360                  * addresses must be 32-bit aligned. If they
 361                  * aren't, then we use a bounce buffer for
 362                  * the (up to three) bytes that screw up the
 363                  * alignment.
 364                  */
 365                 offset = (4 - (addr & 0x3)) & 0x3;
 366                 if (offset) {
 367                         if (data->flags & MMC_DATA_WRITE) {
 368                                 buffer = sdhci_kmap_atomic(sg, &flags);
 369                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 370                                 memcpy(align, buffer, offset);
 371                                 sdhci_kunmap_atomic(buffer, &flags);
 372                         }
 373
 374                         desc[7] = (align_addr >> 24) & 0xff;
 375                         desc[6] = (align_addr >> 16) & 0xff;
 376                         desc[5] = (align_addr >> 8) & 0xff;
 377                         desc[4] = (align_addr >> 0) & 0xff;
 378
 379                         BUG_ON(offset > 65536);
 380
 381                         desc[3] = (offset >> 8) & 0xff;
 382                         desc[2] = (offset >> 0) & 0xff;
 383
 384                         desc[1] = 0x00;
 385                         desc[0] = 0x21; /* tran, valid */
 386
 387                         align += 4;
 388                         align_addr += 4;
 389
 390                         desc += 8;
 391
 392                         addr += offset;
 393                         len -= offset;
 394                 }
 395
 396                 desc[7] = (addr >> 24) & 0xff;
 397                 desc[6] = (addr >> 16) & 0xff;
 398                 desc[5] = (addr >> 8) & 0xff;
 399                 desc[4] = (addr >> 0) & 0xff;
 400
 401                 BUG_ON(len > 65536);
 402
 403                 desc[3] = (len >> 8) & 0xff;
 404                 desc[2] = (len >> 0) & 0xff;
 405
 406                 desc[1] = 0x00;
 407                 desc[0] = 0x21; /* tran, valid */
 408
 409                 desc += 8;
 410
 411                 /*
 412                  * If this triggers then we have a calculation bug
 413                  * somewhere. :/
 414                  */
 415                 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
 416         }
 417
 418         /*
 419          * Add a terminating entry.
 420          */
 421         desc[7] = 0;
 422         desc[6] = 0;
 423         desc[5] = 0;
 424         desc[4] = 0;
 425
 426         desc[3] = 0;
 427         desc[2] = 0;
 428
 429         desc[1] = 0x00;
 430         desc[0] = 0x03; /* nop, end, valid */
 431
 432         /*
 433          * Resync align buffer as we might have changed it.
 434          */
 435         if (data->flags & MMC_DATA_WRITE) {
 436                 dma_sync_single_for_device(mmc_dev(host->mmc),
 437                         host->align_addr, 128 * 4, direction);
 438         }
 439
 440         host->adma_addr = dma_map_single(mmc_dev(host->mmc),
 441                 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
 442         if (dma_mapping_error(host->align_addr))
 443                 goto unmap_entries;
 444         BUG_ON(host->adma_addr & 0x3);
 445
 446         return 0;
 447
 448 unmap_entries:
 449         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 450                 data->sg_len, direction);
 451 unmap_align:
 452         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 453                 128 * 4, direction);
 454 fail:
 455         return -EINVAL;
 456 }
 457
 458 static void sdhci_adma_table_post(struct sdhci_host *host,
 459         struct mmc_data *data)
 460 {
 461         int direction;
 462
 463         struct scatterlist *sg;
 464         int i, size;
 465         u8 *align;
 466         char *buffer;
 467         unsigned long flags;
 468
 469         if (data->flags & MMC_DATA_READ)
 470                 direction = DMA_FROM_DEVICE;
 471         else
 472                 direction = DMA_TO_DEVICE;
 473
 474         dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
 475                 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
 476
 477         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 478                 128 * 4, direction);
 479
 480         if (data->flags & MMC_DATA_READ) {
 481                 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 482                         data->sg_len, direction);
 483
 484                 align = host->align_buffer;
 485
 486                 for_each_sg(data->sg, sg, host->sg_count, i) {
 487                         if (sg_dma_address(sg) & 0x3) {
 488                                 size = 4 - (sg_dma_address(sg) & 0x3);
 489
 490                                 buffer = sdhci_kmap_atomic(sg, &flags);
 491                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 492                                 memcpy(buffer, align, size);
 493                                 sdhci_kunmap_atomic(buffer, &flags);
 494
 495                                 align += 4;
 496                         }
 497                 }
 498         }
 499
 500         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 501                 data->sg_len, direction);
 502 }
 503
 504 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data)
 505 {
 506         u8 count;
 507         unsigned target_timeout, current_timeout;
 508
 509         /*
 510          * If the host controller provides us with an incorrect timeout
 511          * value, just skip the check and use 0xE.  The hardware may take
 512          * longer to time out, but that's much better than having a too-short
 513          * timeout value.
 514          */
 515         if ((host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL))
 516                 return 0xE;
 517
 518         /* timeout in us */
 519         target_timeout = data->timeout_ns / 1000 +
 520                 data->timeout_clks / host->clock;
 521
 522         /*
 523          * Figure out needed cycles.
 524          * We do this in steps in order to fit inside a 32 bit int.
 525          * The first step is the minimum timeout, which will have a
 526          * minimum resolution of 6 bits:
 527          * (1) 2^13*1000 > 2^22,
 528          * (2) host->timeout_clk < 2^16
 529          *     =>
 530          *     (1) / (2) > 2^6
 531          */
 532         count = 0;
 533         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 534         while (current_timeout < target_timeout) {
 535                 count++;
 536                 current_timeout <<= 1;
 537                 if (count >= 0xF)
 538                         break;
 539         }
 540
 541         if (count >= 0xF) {
 542                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 543                         mmc_hostname(host->mmc));
 544                 count = 0xE;
 545         }
 546
 547         return count;
 548 }
 549
 550 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 551 {
 552         u8 count;
 553         u8 ctrl;
 554         int ret;
 555
 556         WARN_ON(host->data);
 557
 558         if (data == NULL)
 559                 return;
 560
 561         /* Sanity checks */
 562         BUG_ON(data->blksz * data->blocks > 524288);
 563         BUG_ON(data->blksz > host->mmc->max_blk_size);
 564         BUG_ON(data->blocks > 65535);
 565
 566         host->data = data;
 567         host->data_early = 0;
 568
 569         count = sdhci_calc_timeout(host, data);
 570         writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 571
 572         if (host->flags & SDHCI_USE_DMA)
 573                 host->flags |= SDHCI_REQ_USE_DMA;
 574
 575         /*
 576          * FIXME: This doesn't account for merging when mapping the
 577          * scatterlist.
 578          */
 579         if (host->flags & SDHCI_REQ_USE_DMA) {
 580                 int broken, i;
 581                 struct scatterlist *sg;
 582
 583                 broken = 0;
 584                 if (host->flags & SDHCI_USE_ADMA) {
 585                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 586                                 broken = 1;
 587                 } else {
 588                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
 589                                 broken = 1;
 590                 }
 591
 592                 if (unlikely(broken)) {
 593                         for_each_sg(data->sg, sg, data->sg_len, i) {
 594                                 if (sg->length & 0x3) {
 595                                         DBG("Reverting to PIO because of "
 596                                                 "transfer size (%d)\n",
 597                                                 sg->length);
 598                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 599                                         break;
 600                                 }
 601                         }
 602                 }
 603         }
 604
 605         /*
 606          * The assumption here being that alignment is the same after
 607          * translation to device address space.
 608          */
 609         if (host->flags & SDHCI_REQ_USE_DMA) {
 610                 int broken, i;
 611                 struct scatterlist *sg;
 612
 613                 broken = 0;
 614                 if (host->flags & SDHCI_USE_ADMA) {
 615                         /*
 616                          * As we use 3 byte chunks to work around
 617                          * alignment problems, we need to check this
 618                          * quirk.
 619                          */
 620                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 621                                 broken = 1;
 622                 } else {
 623                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
 624                                 broken = 1;
 625                 }
 626
 627                 if (unlikely(broken)) {
 628                         for_each_sg(data->sg, sg, data->sg_len, i) {
 629                                 if (sg->offset & 0x3) {
 630                                         DBG("Reverting to PIO because of "
 631                                                 "bad alignment\n");
 632                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 633                                         break;
 634                                 }
 635                         }
 636                 }
 637         }
 638
 639         if (host->flags & SDHCI_REQ_USE_DMA) {
 640                 if (host->flags & SDHCI_USE_ADMA) {
 641                         ret = sdhci_adma_table_pre(host, data);
 642                         if (ret) {
 643                                 /*
 644                                  * This only happens when someone fed
 645                                  * us an invalid request.
 646                                  */
 647                                 WARN_ON(1);
 648                                 host->flags &= ~SDHCI_USE_DMA;
 649                         } else {
 650                                 writel(host->adma_addr,
 651                                         host->ioaddr + SDHCI_ADMA_ADDRESS);
 652                         }
 653                 } else {
 654                         int sg_cnt;
 655
 656                         sg_cnt = dma_map_sg(mmc_dev(host->mmc),
 657                                         data->sg, data->sg_len,
 658                                         (data->flags & MMC_DATA_READ) ?
 659                                                 DMA_FROM_DEVICE :
 660                                                 DMA_TO_DEVICE);
 661                         if (sg_cnt == 0) {
 662                                 /*
 663                                  * This only happens when someone fed
 664                                  * us an invalid request.
 665                                  */
 666                                 WARN_ON(1);
 667                                 host->flags &= ~SDHCI_USE_DMA;
 668                         } else {
 669                                 WARN_ON(sg_cnt != 1);
 670                                 writel(sg_dma_address(data->sg),
 671                                         host->ioaddr + SDHCI_DMA_ADDRESS);
 672                         }
 673                 }
 674         }
 675
 676         /*
 677          * Always adjust the DMA selection as some controllers
 678          * (e.g. JMicron) can't do PIO properly when the selection
 679          * is ADMA.
 680          */
 681         if (host->version >= SDHCI_SPEC_200) {
 682                 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
 683                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
 684                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
 685                         (host->flags & SDHCI_USE_ADMA))
 686                         ctrl |= SDHCI_CTRL_ADMA32;
 687                 else
 688                         ctrl |= SDHCI_CTRL_SDMA;
 689                 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 690         }
 691
 692         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
 693                 sg_miter_start(&host->sg_miter,
 694                         data->sg, data->sg_len, SG_MITER_ATOMIC);
 695                 host->blocks = data->blocks;
 696         }
 697
 698         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 699         writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
 700                 host->ioaddr + SDHCI_BLOCK_SIZE);
 701         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 702 }
 703
 704 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 705         struct mmc_data *data)
 706 {
 707         u16 mode;
 708
 709         if (data == NULL)
 710                 return;
 711
 712         WARN_ON(!host->data);
 713
 714         mode = SDHCI_TRNS_BLK_CNT_EN;
 715         if (data->blocks > 1)
 716                 mode |= SDHCI_TRNS_MULTI;
 717         if (data->flags & MMC_DATA_READ)
 718                 mode |= SDHCI_TRNS_READ;
 719         if (host->flags & SDHCI_REQ_USE_DMA)
 720                 mode |= SDHCI_TRNS_DMA;
 721
 722         writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 723 }
 724
 725 static void sdhci_finish_data(struct sdhci_host *host)
 726 {
 727         struct mmc_data *data;
 728
 729         BUG_ON(!host->data);
 730
 731         data = host->data;
 732         host->data = NULL;
 733
 734         if (host->flags & SDHCI_REQ_USE_DMA) {
 735                 if (host->flags & SDHCI_USE_ADMA)
 736                         sdhci_adma_table_post(host, data);
 737                 else {
 738                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 739                                 data->sg_len, (data->flags & MMC_DATA_READ) ?
 740                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
 741                 }
 742         }
 743
 744         /*
 745          * The specification states that the block count register must
 746          * be updated, but it does not specify at what point in the
 747          * data flow. That makes the register entirely useless to read
 748          * back so we have to assume that nothing made it to the card
 749          * in the event of an error.
 750          */
 751         if (data->error)
 752                 data->bytes_xfered = 0;
 753         else
 754                 data->bytes_xfered = data->blksz * data->blocks;
 755
 756         if (data->stop) {
 757                 /*
 758                  * The controller needs a reset of internal state machines
 759                  * upon error conditions.
 760                  */
 761                 if (data->error) {
 762                         sdhci_reset(host, SDHCI_RESET_CMD);
 763                         sdhci_reset(host, SDHCI_RESET_DATA);
 764                 }
 765
 766                 sdhci_send_command(host, data->stop);
 767         } else
 768                 tasklet_schedule(&host->finish_tasklet);
 769 }
 770
 771 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 772 {
 773         int flags;
 774         u32 mask;
 775         unsigned long timeout;
 776
 777         WARN_ON(host->cmd);
 778
 779         /* Wait max 10 ms */
 780         timeout = 10;
 781
 782         mask = SDHCI_CMD_INHIBIT;
 783         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 784                 mask |= SDHCI_DATA_INHIBIT;
 785
 786         /* We shouldn't wait for data inihibit for stop commands, even
 787            though they might use busy signaling */
 788         if (host->mrq->data && (cmd == host->mrq->data->stop))
 789                 mask &= ~SDHCI_DATA_INHIBIT;
 790
 791         while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
 792                 if (timeout == 0) {
 793                         printk(KERN_ERR "%s: Controller never released "
 794                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 795                         sdhci_dumpregs(host);
 796                         cmd->error = -EIO;
 797                         tasklet_schedule(&host->finish_tasklet);
 798                         return;
 799                 }
 800                 timeout--;
 801                 mdelay(1);
 802         }
 803
 804         mod_timer(&host->timer, jiffies + 10 * HZ);
 805
 806         host->cmd = cmd;
 807
 808         sdhci_prepare_data(host, cmd->data);
 809
 810         writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 811
 812         sdhci_set_transfer_mode(host, cmd->data);
 813
 814         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 815                 printk(KERN_ERR "%s: Unsupported response type!\n",
 816                         mmc_hostname(host->mmc));
 817                 cmd->error = -EINVAL;
 818                 tasklet_schedule(&host->finish_tasklet);
 819                 return;
 820         }
 821
 822         if (!(cmd->flags & MMC_RSP_PRESENT))
 823                 flags = SDHCI_CMD_RESP_NONE;
 824         else if (cmd->flags & MMC_RSP_136)
 825                 flags = SDHCI_CMD_RESP_LONG;
 826         else if (cmd->flags & MMC_RSP_BUSY)
 827                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 828         else
 829                 flags = SDHCI_CMD_RESP_SHORT;
 830
 831         if (cmd->flags & MMC_RSP_CRC)
 832                 flags |= SDHCI_CMD_CRC;
 833         if (cmd->flags & MMC_RSP_OPCODE)
 834                 flags |= SDHCI_CMD_INDEX;
 835         if (cmd->data)
 836                 flags |= SDHCI_CMD_DATA;
 837
 838         writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
 839                 host->ioaddr + SDHCI_COMMAND);
 840 }
 841
 842 static void sdhci_finish_command(struct sdhci_host *host)
 843 {
 844         int i;
 845
 846         BUG_ON(host->cmd == NULL);
 847
 848         if (host->cmd->flags & MMC_RSP_PRESENT) {
 849                 if (host->cmd->flags & MMC_RSP_136) {
 850                         /* CRC is stripped so we need to do some shifting. */
 851                         for (i = 0;i < 4;i++) {
 852                                 host->cmd->resp[i] = readl(host->ioaddr +
 853                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 854                                 if (i != 3)
 855                                         host->cmd->resp[i] |=
 856                                                 readb(host->ioaddr +
 857                                                 SDHCI_RESPONSE + (3-i)*4-1);
 858                         }
 859                 } else {
 860                         host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
 861                 }
 862         }
 863
 864         host->cmd->error = 0;
 865
 866         if (host->data && host->data_early)
 867                 sdhci_finish_data(host);
 868
 869         if (!host->cmd->data)
 870                 tasklet_schedule(&host->finish_tasklet);
 871
 872         host->cmd = NULL;
 873 }
 874
 875 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 876 {
 877         int div;
 878         u16 clk;
 879         unsigned long timeout;
 880
 881         if (clock == host->clock)
 882                 return;
 883
 884         writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 885
 886         if (clock == 0)
 887                 goto out;
 888
 889         for (div = 1;div < 256;div *= 2) {
 890                 if ((host->max_clk / div) <= clock)
 891                         break;
 892         }
 893         div >>= 1;
 894
 895         clk = div << SDHCI_DIVIDER_SHIFT;
 896         clk |= SDHCI_CLOCK_INT_EN;
 897         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 898
 899         /* Wait max 10 ms */
 900         timeout = 10;
 901         while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
 902                 & SDHCI_CLOCK_INT_STABLE)) {
 903                 if (timeout == 0) {
 904                         printk(KERN_ERR "%s: Internal clock never "
 905                                 "stabilised.\n", mmc_hostname(host->mmc));
 906                         sdhci_dumpregs(host);
 907                         return;
 908                 }
 909                 timeout--;
 910                 mdelay(1);
 911         }
 912
 913         clk |= SDHCI_CLOCK_CARD_EN;
 914         writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
 915
 916 out:
 917         host->clock = clock;
 918 }
 919
 920 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 921 {
 922         u8 pwr;
 923
 924         if (host->power == power)
 925                 return;
 926
 927         if (power == (unsigned short)-1) {
 928                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 929                 goto out;
 930         }
 931
 932         /*
 933          * Spec says that we should clear the power reg before setting
 934          * a new value. Some controllers don't seem to like this though.
 935          */
 936         if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
 937                 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
 938
 939         pwr = SDHCI_POWER_ON;
 940
 941         switch (1 << power) {
 942         case MMC_VDD_165_195:
 943                 pwr |= SDHCI_POWER_180;
 944                 break;
 945         case MMC_VDD_29_30:
 946         case MMC_VDD_30_31:
 947                 pwr |= SDHCI_POWER_300;
 948                 break;
 949         case MMC_VDD_32_33:
 950         case MMC_VDD_33_34:
 951                 pwr |= SDHCI_POWER_330;
 952                 break;
 953         default:
 954                 BUG();
 955         }
 956
 957         /*
 958          * At least the Marvell CaFe chip gets confused if we set the voltage
 959          * and set turn on power at the same time, so set the voltage first.
 960          */
 961         if ((host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER))
 962                 writeb(pwr & ~SDHCI_POWER_ON,
 963                                 host->ioaddr + SDHCI_POWER_CONTROL);
 964
 965         writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
 966
 967 out:
 968         host->power = power;
 969 }
 970
 971 /*****************************************************************************\
 972  *                                                                           *
 973  * MMC callbacks                                                             *
 974  *                                                                           *
 975 \*****************************************************************************/
 976
 977 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 978 {
 979         struct sdhci_host *host;
 980         unsigned long flags;
 981
 982         host = mmc_priv(mmc);
 983
 984         spin_lock_irqsave(&host->lock, flags);
 985
 986         WARN_ON(host->mrq != NULL);
 987
 988 #ifndef CONFIG_LEDS_CLASS
 989         sdhci_activate_led(host);
 990 #endif
 991
 992         host->mrq = mrq;
 993
 994         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)
 995                 || (host->flags & SDHCI_DEVICE_DEAD)) {
 996                 host->mrq->cmd->error = -ENOMEDIUM;
 997                 tasklet_schedule(&host->finish_tasklet);
 998         } else
 999                 sdhci_send_command(host, mrq->cmd);
1000
1001         mmiowb();
1002         spin_unlock_irqrestore(&host->lock, flags);
1003 }
1004
1005 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1006 {
1007         struct sdhci_host *host;
1008         unsigned long flags;
1009         u8 ctrl;
1010
1011         host = mmc_priv(mmc);
1012
1013         spin_lock_irqsave(&host->lock, flags);
1014
1015         if (host->flags & SDHCI_DEVICE_DEAD)
1016                 goto out;
1017
1018         /*
1019          * Reset the chip on each power off.
1020          * Should clear out any weird states.
1021          */
1022         if (ios->power_mode == MMC_POWER_OFF) {
1023                 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
1024                 sdhci_init(host);
1025         }
1026
1027         sdhci_set_clock(host, ios->clock);
1028
1029         if (ios->power_mode == MMC_POWER_OFF)
1030                 sdhci_set_power(host, -1);
1031         else
1032                 sdhci_set_power(host, ios->vdd);
1033
1034         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
1035
1036         if (ios->bus_width == MMC_BUS_WIDTH_4)
1037                 ctrl |= SDHCI_CTRL_4BITBUS;
1038         else
1039                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1040
1041         if (ios->timing == MMC_TIMING_SD_HS)
1042                 ctrl |= SDHCI_CTRL_HISPD;
1043         else
1044                 ctrl &= ~SDHCI_CTRL_HISPD;
1045
1046         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
1047
1048         /*
1049          * Some (ENE) controllers go apeshit on some ios operation,
1050          * signalling timeout and CRC errors even on CMD0. Resetting
1051          * it on each ios seems to solve the problem.
1052          */
1053         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1054                 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1055
1056 out:
1057         mmiowb();
1058         spin_unlock_irqrestore(&host->lock, flags);
1059 }
1060
1061 static int sdhci_get_ro(struct mmc_host *mmc)
1062 {
1063         struct sdhci_host *host;
1064         unsigned long flags;
1065         int present;
1066
1067         host = mmc_priv(mmc);
1068
1069         spin_lock_irqsave(&host->lock, flags);
1070
1071         if (host->flags & SDHCI_DEVICE_DEAD)
1072                 present = 0;
1073         else
1074                 present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
1075
1076         spin_unlock_irqrestore(&host->lock, flags);
1077
1078         return !(present & SDHCI_WRITE_PROTECT);
1079 }
1080
1081 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1082 {
1083         struct sdhci_host *host;
1084         unsigned long flags;
1085         u32 ier;
1086
1087         host = mmc_priv(mmc);
1088
1089         spin_lock_irqsave(&host->lock, flags);
1090
1091         if (host->flags & SDHCI_DEVICE_DEAD)
1092                 goto out;
1093
1094         ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
1095
1096         ier &= ~SDHCI_INT_CARD_INT;
1097         if (enable)
1098                 ier |= SDHCI_INT_CARD_INT;
1099
1100         writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
1101         writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
1102
1103 out:
1104         mmiowb();
1105
1106         spin_unlock_irqrestore(&host->lock, flags);
1107 }
1108
1109 static const struct mmc_host_ops sdhci_ops = {
1110         .request        = sdhci_request,
1111         .set_ios        = sdhci_set_ios,
1112         .get_ro         = sdhci_get_ro,
1113         .enable_sdio_irq = sdhci_enable_sdio_irq,
1114 };
1115
1116 /*****************************************************************************\
1117  *                                                                           *
1118  * Tasklets                                                                  *
1119  *                                                                           *
1120 \*****************************************************************************/
1121
1122 static void sdhci_tasklet_card(unsigned long param)
1123 {
1124         struct sdhci_host *host;
1125         unsigned long flags;
1126
1127         host = (struct sdhci_host*)param;
1128
1129         spin_lock_irqsave(&host->lock, flags);
1130
1131         if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
1132                 if (host->mrq) {
1133                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1134                                 mmc_hostname(host->mmc));
1135                         printk(KERN_ERR "%s: Resetting controller.\n",
1136                                 mmc_hostname(host->mmc));
1137
1138                         sdhci_reset(host, SDHCI_RESET_CMD);
1139                         sdhci_reset(host, SDHCI_RESET_DATA);
1140
1141                         host->mrq->cmd->error = -ENOMEDIUM;
1142                         tasklet_schedule(&host->finish_tasklet);
1143                 }
1144         }
1145
1146         spin_unlock_irqrestore(&host->lock, flags);
1147
1148         mmc_detect_change(host->mmc, msecs_to_jiffies(500));
1149 }
1150
1151 static void sdhci_tasklet_finish(unsigned long param)
1152 {
1153         struct sdhci_host *host;
1154         unsigned long flags;
1155         struct mmc_request *mrq;
1156
1157         host = (struct sdhci_host*)param;
1158
1159         spin_lock_irqsave(&host->lock, flags);
1160
1161         del_timer(&host->timer);
1162
1163         mrq = host->mrq;
1164
1165         /*
1166          * The controller needs a reset of internal state machines
1167          * upon error conditions.
1168          */
1169         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
1170                 (mrq->cmd->error ||
1171                  (mrq->data && (mrq->data->error ||
1172                   (mrq->data->stop && mrq->data->stop->error))) ||
1173                    (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
1174
1175                 /* Some controllers need this kick or reset won't work here */
1176                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
1177                         unsigned int clock;
1178
1179                         /* This is to force an update */
1180                         clock = host->clock;
1181                         host->clock = 0;
1182                         sdhci_set_clock(host, clock);
1183                 }
1184
1185                 /* Spec says we should do both at the same time, but Ricoh
1186                    controllers do not like that. */
1187                 sdhci_reset(host, SDHCI_RESET_CMD);
1188                 sdhci_reset(host, SDHCI_RESET_DATA);
1189         }
1190
1191         host->mrq = NULL;
1192         host->cmd = NULL;
1193         host->data = NULL;
1194
1195 #ifndef CONFIG_LEDS_CLASS
1196         sdhci_deactivate_led(host);
1197 #endif
1198
1199         mmiowb();
1200         spin_unlock_irqrestore(&host->lock, flags);
1201
1202         mmc_request_done(host->mmc, mrq);
1203 }
1204
1205 static void sdhci_timeout_timer(unsigned long data)
1206 {
1207         struct sdhci_host *host;
1208         unsigned long flags;
1209
1210         host = (struct sdhci_host*)data;
1211
1212         spin_lock_irqsave(&host->lock, flags);
1213
1214         if (host->mrq) {
1215                 printk(KERN_ERR "%s: Timeout waiting for hardware "
1216                         "interrupt.\n", mmc_hostname(host->mmc));
1217                 sdhci_dumpregs(host);
1218
1219                 if (host->data) {
1220                         host->data->error = -ETIMEDOUT;
1221                         sdhci_finish_data(host);
1222                 } else {
1223                         if (host->cmd)
1224                                 host->cmd->error = -ETIMEDOUT;
1225                         else
1226                                 host->mrq->cmd->error = -ETIMEDOUT;
1227
1228                         tasklet_schedule(&host->finish_tasklet);
1229                 }
1230         }
1231
1232         mmiowb();
1233         spin_unlock_irqrestore(&host->lock, flags);
1234 }
1235
1236 /*****************************************************************************\
1237  *                                                                           *
1238  * Interrupt handling                                                        *
1239  *                                                                           *
1240 \*****************************************************************************/
1241
1242 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
1243 {
1244         BUG_ON(intmask == 0);
1245
1246         if (!host->cmd) {
1247                 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
1248                         "though no command operation was in progress.\n",
1249                         mmc_hostname(host->mmc), (unsigned)intmask);
1250                 sdhci_dumpregs(host);
1251                 return;
1252         }
1253
1254         if (intmask & SDHCI_INT_TIMEOUT)
1255                 host->cmd->error = -ETIMEDOUT;
1256         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
1257                         SDHCI_INT_INDEX))
1258                 host->cmd->error = -EILSEQ;
1259
1260         if (host->cmd->error)
1261                 tasklet_schedule(&host->finish_tasklet);
1262         else if (intmask & SDHCI_INT_RESPONSE)
1263                 sdhci_finish_command(host);
1264 }
1265
1266 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
1267 {
1268         BUG_ON(intmask == 0);
1269
1270         if (!host->data) {
1271                 /*
1272                  * A data end interrupt is sent together with the response
1273                  * for the stop command.
1274                  */
1275                 if (intmask & SDHCI_INT_DATA_END)
1276                         return;
1277
1278                 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
1279                         "though no data operation was in progress.\n",
1280                         mmc_hostname(host->mmc), (unsigned)intmask);
1281                 sdhci_dumpregs(host);
1282
1283                 return;
1284         }
1285
1286         if (intmask & SDHCI_INT_DATA_TIMEOUT)
1287                 host->data->error = -ETIMEDOUT;
1288         else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
1289                 host->data->error = -EILSEQ;
1290         else if (intmask & SDHCI_INT_ADMA_ERROR)
1291                 host->data->error = -EIO;
1292
1293         if (host->data->error)
1294                 sdhci_finish_data(host);
1295         else {
1296                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1297                         sdhci_transfer_pio(host);
1298
1299                 /*
1300                  * We currently don't do anything fancy with DMA
1301                  * boundaries, but as we can't disable the feature
1302                  * we need to at least restart the transfer.
1303                  */
1304                 if (intmask & SDHCI_INT_DMA_END)
1305                         writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1306                                 host->ioaddr + SDHCI_DMA_ADDRESS);
1307
1308                 if (intmask & SDHCI_INT_DATA_END) {
1309                         if (host->cmd) {
1310                                 /*
1311                                  * Data managed to finish before the
1312                                  * command completed. Make sure we do
1313                                  * things in the proper order.
1314                                  */
1315                                 host->data_early = 1;
1316                         } else {
1317                                 sdhci_finish_data(host);
1318                         }
1319                 }
1320         }
1321 }
1322
1323 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1324 {
1325         irqreturn_t result;
1326         struct sdhci_host* host = dev_id;
1327         u32 intmask;
1328         int cardint = 0;
1329
1330         spin_lock(&host->lock);
1331
1332         intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1333
1334         if (!intmask || intmask == 0xffffffff) {
1335                 result = IRQ_NONE;
1336                 goto out;
1337         }
1338
1339         DBG("*** %s got interrupt: 0x%08x\n",
1340                 mmc_hostname(host->mmc), intmask);
1341
1342         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1343                 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1344                         host->ioaddr + SDHCI_INT_STATUS);
1345                 tasklet_schedule(&host->card_tasklet);
1346         }
1347
1348         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1349
1350         if (intmask & SDHCI_INT_CMD_MASK) {
1351                 writel(intmask & SDHCI_INT_CMD_MASK,
1352                         host->ioaddr + SDHCI_INT_STATUS);
1353                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1354         }
1355
1356         if (intmask & SDHCI_INT_DATA_MASK) {
1357                 writel(intmask & SDHCI_INT_DATA_MASK,
1358                         host->ioaddr + SDHCI_INT_STATUS);
1359                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1360         }
1361
1362         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1363
1364         intmask &= ~SDHCI_INT_ERROR;
1365
1366         if (intmask & SDHCI_INT_BUS_POWER) {
1367                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1368                         mmc_hostname(host->mmc));
1369                 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1370         }
1371
1372         intmask &= ~SDHCI_INT_BUS_POWER;
1373
1374         if (intmask & SDHCI_INT_CARD_INT)
1375                 cardint = 1;
1376
1377         intmask &= ~SDHCI_INT_CARD_INT;
1378
1379         if (intmask) {
1380                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1381                         mmc_hostname(host->mmc), intmask);
1382                 sdhci_dumpregs(host);
1383
1384                 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1385         }
1386
1387         result = IRQ_HANDLED;
1388
1389         mmiowb();
1390 out:
1391         spin_unlock(&host->lock);
1392
1393         /*
1394          * We have to delay this as it calls back into the driver.
1395          */
1396         if (cardint)
1397                 mmc_signal_sdio_irq(host->mmc);
1398
1399         return result;
1400 }
1401
1402 /*****************************************************************************\
1403  *                                                                           *
1404  * Suspend/resume                                                            *
1405  *                                                                           *
1406 \*****************************************************************************/
1407
1408 #ifdef CONFIG_PM
1409
1410 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1411 {
1412         int ret;
1413
1414         ret = mmc_suspend_host(host->mmc, state);
1415         if (ret)
1416                 return ret;
1417
1418         free_irq(host->irq, host);
1419
1420         return 0;
1421 }
1422
1423 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1424
1425 int sdhci_resume_host(struct sdhci_host *host)
1426 {
1427         int ret;
1428
1429         if (host->flags & SDHCI_USE_DMA) {
1430                 if (host->ops->enable_dma)
1431                         host->ops->enable_dma(host);
1432         }
1433
1434         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1435                           mmc_hostname(host->mmc), host);
1436         if (ret)
1437                 return ret;
1438
1439         sdhci_init(host);
1440         mmiowb();
1441
1442         ret = mmc_resume_host(host->mmc);
1443         if (ret)
1444                 return ret;
1445
1446         return 0;
1447 }
1448
1449 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1450
1451 #endif /* CONFIG_PM */
1452
1453 /*****************************************************************************\
1454  *                                                                           *
1455  * Device allocation/registration                                            *
1456  *                                                                           *
1457 \*****************************************************************************/
1458
1459 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1460         size_t priv_size)
1461 {
1462         struct mmc_host *mmc;
1463         struct sdhci_host *host;
1464
1465         WARN_ON(dev == NULL);
1466
1467         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1468         if (!mmc)
1469                 return ERR_PTR(-ENOMEM);
1470
1471         host = mmc_priv(mmc);
1472         host->mmc = mmc;
1473
1474         return host;
1475 }
1476
1477 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1478
1479 int sdhci_add_host(struct sdhci_host *host)
1480 {
1481         struct mmc_host *mmc;
1482         unsigned int caps;
1483         int ret;
1484
1485         WARN_ON(host == NULL);
1486         if (host == NULL)
1487                 return -EINVAL;
1488
1489         mmc = host->mmc;
1490
1491         if (debug_quirks)
1492                 host->quirks = debug_quirks;
1493
1494         sdhci_reset(host, SDHCI_RESET_ALL);
1495
1496         host->version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1497         host->version = (host->version & SDHCI_SPEC_VER_MASK)
1498                                 >> SDHCI_SPEC_VER_SHIFT;
1499         if (host->version > SDHCI_SPEC_200) {
1500                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1501                         "You may experience problems.\n", mmc_hostname(mmc),
1502                         host->version);
1503         }
1504
1505         caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1506
1507         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1508                 host->flags |= SDHCI_USE_DMA;
1509         else if (!(caps & SDHCI_CAN_DO_DMA))
1510                 DBG("Controller doesn't have DMA capability\n");
1511         else
1512                 host->flags |= SDHCI_USE_DMA;
1513
1514         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1515                 (host->flags & SDHCI_USE_DMA)) {
1516                 DBG("Disabling DMA as it is marked broken\n");
1517                 host->flags &= ~SDHCI_USE_DMA;
1518         }
1519
1520         if (host->flags & SDHCI_USE_DMA) {
1521                 if ((host->version >= SDHCI_SPEC_200) &&
1522                                 (caps & SDHCI_CAN_DO_ADMA2))
1523                         host->flags |= SDHCI_USE_ADMA;
1524         }
1525
1526         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
1527                 (host->flags & SDHCI_USE_ADMA)) {
1528                 DBG("Disabling ADMA as it is marked broken\n");
1529                 host->flags &= ~SDHCI_USE_ADMA;
1530         }
1531
1532         if (host->flags & SDHCI_USE_DMA) {
1533                 if (host->ops->enable_dma) {
1534                         if (host->ops->enable_dma(host)) {
1535                                 printk(KERN_WARNING "%s: No suitable DMA "
1536                                         "available. Falling back to PIO.\n",
1537                                         mmc_hostname(mmc));
1538                                 host->flags &= ~(SDHCI_USE_DMA | SDHCI_USE_ADMA);
1539                         }
1540                 }
1541         }
1542
1543         if (host->flags & SDHCI_USE_ADMA) {
1544                 /*
1545                  * We need to allocate descriptors for all sg entries
1546                  * (128) and potentially one alignment transfer for
1547                  * each of those entries.
1548                  */
1549                 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
1550                 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
1551                 if (!host->adma_desc || !host->align_buffer) {
1552                         kfree(host->adma_desc);
1553                         kfree(host->align_buffer);
1554                         printk(KERN_WARNING "%s: Unable to allocate ADMA "
1555                                 "buffers. Falling back to standard DMA.\n",
1556                                 mmc_hostname(mmc));
1557                         host->flags &= ~SDHCI_USE_ADMA;
1558                 }
1559         }
1560
1561         /*
1562          * If we use DMA, then it's up to the caller to set the DMA
1563          * mask, but PIO does not need the hw shim so we set a new
1564          * mask here in that case.
1565          */
1566         if (!(host->flags & SDHCI_USE_DMA)) {
1567                 host->dma_mask = DMA_BIT_MASK(64);
1568                 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
1569         }
1570
1571         host->max_clk =
1572                 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1573         if (host->max_clk == 0) {
1574                 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1575                         "frequency.\n", mmc_hostname(mmc));
1576                 return -ENODEV;
1577         }
1578         host->max_clk *= 1000000;
1579
1580         host->timeout_clk =
1581                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1582         if (host->timeout_clk == 0) {
1583                 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1584                         "frequency.\n", mmc_hostname(mmc));
1585                 return -ENODEV;
1586         }
1587         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1588                 host->timeout_clk *= 1000;
1589
1590         /*
1591          * Set host parameters.
1592          */
1593         mmc->ops = &sdhci_ops;
1594         mmc->f_min = host->max_clk / 256;
1595         mmc->f_max = host->max_clk;
1596         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1597
1598         if (caps & SDHCI_CAN_DO_HISPD)
1599                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1600
1601         mmc->ocr_avail = 0;
1602         if (caps & SDHCI_CAN_VDD_330)
1603                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1604         if (caps & SDHCI_CAN_VDD_300)
1605                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1606         if (caps & SDHCI_CAN_VDD_180)
1607                 mmc->ocr_avail |= MMC_VDD_165_195;
1608
1609         if (mmc->ocr_avail == 0) {
1610                 printk(KERN_ERR "%s: Hardware doesn't report any "
1611                         "support voltages.\n", mmc_hostname(mmc));
1612                 return -ENODEV;
1613         }
1614
1615         spin_lock_init(&host->lock);
1616
1617         /*
1618          * Maximum number of segments. Depends on if the hardware
1619          * can do scatter/gather or not.
1620          */
1621         if (host->flags & SDHCI_USE_ADMA)
1622                 mmc->max_hw_segs = 128;
1623         else if (host->flags & SDHCI_USE_DMA)
1624                 mmc->max_hw_segs = 1;
1625         else /* PIO */
1626                 mmc->max_hw_segs = 128;
1627         mmc->max_phys_segs = 128;
1628
1629         /*
1630          * Maximum number of sectors in one transfer. Limited by DMA boundary
1631          * size (512KiB).
1632          */
1633         mmc->max_req_size = 524288;
1634
1635         /*
1636          * Maximum segment size. Could be one segment with the maximum number
1637          * of bytes. When doing hardware scatter/gather, each entry cannot
1638          * be larger than 64 KiB though.
1639          */
1640         if (host->flags & SDHCI_USE_ADMA)
1641                 mmc->max_seg_size = 65536;
1642         else
1643                 mmc->max_seg_size = mmc->max_req_size;
1644
1645         /*
1646          * Maximum block size. This varies from controller to controller and
1647          * is specified in the capabilities register.
1648          */
1649         mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1650         if (mmc->max_blk_size >= 3) {
1651                 printk(KERN_WARNING "%s: Invalid maximum block size, "
1652                         "assuming 512 bytes\n", mmc_hostname(mmc));
1653                 mmc->max_blk_size = 512;
1654         } else
1655                 mmc->max_blk_size = 512 << mmc->max_blk_size;
1656
1657         /*
1658          * Maximum block count.
1659          */
1660         mmc->max_blk_count = 65535;
1661
1662         /*
1663          * Init tasklets.
1664          */
1665         tasklet_init(&host->card_tasklet,
1666                 sdhci_tasklet_card, (unsigned long)host);
1667         tasklet_init(&host->finish_tasklet,
1668                 sdhci_tasklet_finish, (unsigned long)host);
1669
1670         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1671
1672         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1673                 mmc_hostname(mmc), host);
1674         if (ret)
1675                 goto untasklet;
1676
1677         sdhci_init(host);
1678
1679 #ifdef CONFIG_MMC_DEBUG
1680         sdhci_dumpregs(host);
1681 #endif
1682
1683 #ifdef CONFIG_LEDS_CLASS
1684         host->led.name = mmc_hostname(mmc);
1685         host->led.brightness = LED_OFF;
1686         host->led.default_trigger = mmc_hostname(mmc);
1687         host->led.brightness_set = sdhci_led_control;
1688
1689         ret = led_classdev_register(mmc_dev(mmc), &host->led);
1690         if (ret)
1691                 goto reset;
1692 #endif
1693
1694         mmiowb();
1695
1696         mmc_add_host(mmc);
1697
1698         printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s%s\n",
1699                 mmc_hostname(mmc), host->hw_name, mmc_dev(mmc)->bus_id,
1700                 (host->flags & SDHCI_USE_ADMA)?"A":"",
1701                 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1702
1703         return 0;
1704
1705 #ifdef CONFIG_LEDS_CLASS
1706 reset:
1707         sdhci_reset(host, SDHCI_RESET_ALL);
1708         free_irq(host->irq, host);
1709 #endif
1710 untasklet:
1711         tasklet_kill(&host->card_tasklet);
1712         tasklet_kill(&host->finish_tasklet);
1713
1714         return ret;
1715 }
1716
1717 EXPORT_SYMBOL_GPL(sdhci_add_host);
1718
1719 void sdhci_remove_host(struct sdhci_host *host, int dead)
1720 {
1721         unsigned long flags;
1722
1723         if (dead) {
1724                 spin_lock_irqsave(&host->lock, flags);
1725
1726                 host->flags |= SDHCI_DEVICE_DEAD;
1727
1728                 if (host->mrq) {
1729                         printk(KERN_ERR "%s: Controller removed during "
1730                                 " transfer!\n", mmc_hostname(host->mmc));
1731
1732                         host->mrq->cmd->error = -ENOMEDIUM;
1733                         tasklet_schedule(&host->finish_tasklet);
1734                 }
1735
1736                 spin_unlock_irqrestore(&host->lock, flags);
1737         }
1738
1739         mmc_remove_host(host->mmc);
1740
1741 #ifdef CONFIG_LEDS_CLASS
1742         led_classdev_unregister(&host->led);
1743 #endif
1744
1745         if (!dead)
1746                 sdhci_reset(host, SDHCI_RESET_ALL);
1747
1748         free_irq(host->irq, host);
1749
1750         del_timer_sync(&host->timer);
1751
1752         tasklet_kill(&host->card_tasklet);
1753         tasklet_kill(&host->finish_tasklet);
1754
1755         kfree(host->adma_desc);
1756         kfree(host->align_buffer);
1757
1758         host->adma_desc = NULL;
1759         host->align_buffer = NULL;
1760 }
1761
1762 EXPORT_SYMBOL_GPL(sdhci_remove_host);
1763
1764 void sdhci_free_host(struct sdhci_host *host)
1765 {
1766         mmc_free_host(host->mmc);
1767 }
1768
1769 EXPORT_SYMBOL_GPL(sdhci_free_host);
1770
1771 /*****************************************************************************\
1772  *                                                                           *
1773  * Driver init/exit                                                          *
1774  *                                                                           *
1775 \*****************************************************************************/
1776
1777 static int __init sdhci_drv_init(void)
1778 {
1779         printk(KERN_INFO DRIVER_NAME
1780                 ": Secure Digital Host Controller Interface driver\n");
1781         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1782
1783         return 0;
1784 }
1785
1786 static void __exit sdhci_drv_exit(void)
1787 {
1788 }
1789
1790 module_init(sdhci_drv_init);
1791 module_exit(sdhci_drv_exit);
1792
1793 module_param(debug_quirks, uint, 0444);
1794
1795 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1796 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
1797 MODULE_LICENSE("GPL");
1798
1799 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");