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/slab.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/regulator/consumer.h>
  23
  24 #include <linux/leds.h>
  25
  26 #include <linux/mmc/host.h>
  27
  28 #include "sdhci.h"
  29
  30 #define DRIVER_NAME "sdhci"
  31
  32 #define DBG(f, x...) \
  33         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  34
  35 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
  36         defined(CONFIG_MMC_SDHCI_MODULE))
  37 #define SDHCI_USE_LEDS_CLASS
  38 #endif
  39
  40 static unsigned int debug_quirks = 0;
  41
  42 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
  43 static void sdhci_finish_data(struct sdhci_host *);
  44
  45 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  46 static void sdhci_finish_command(struct sdhci_host *);
  47
  48 static void sdhci_dumpregs(struct sdhci_host *host)
  49 {
  50         printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
  51
  52         printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  53                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
  54                 sdhci_readw(host, SDHCI_HOST_VERSION));
  55         printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  56                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
  57                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
  58         printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  59                 sdhci_readl(host, SDHCI_ARGUMENT),
  60                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
  61         printk(KERN_DEBUG DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  62                 sdhci_readl(host, SDHCI_PRESENT_STATE),
  63                 sdhci_readb(host, SDHCI_HOST_CONTROL));
  64         printk(KERN_DEBUG DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  65                 sdhci_readb(host, SDHCI_POWER_CONTROL),
  66                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
  67         printk(KERN_DEBUG DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  68                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
  69                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
  70         printk(KERN_DEBUG DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
  71                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
  72                 sdhci_readl(host, SDHCI_INT_STATUS));
  73         printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
  74                 sdhci_readl(host, SDHCI_INT_ENABLE),
  75                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
  76         printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
  77                 sdhci_readw(host, SDHCI_ACMD12_ERR),
  78                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
  79         printk(KERN_DEBUG DRIVER_NAME ": Caps:     0x%08x | Max curr: 0x%08x\n",
  80                 sdhci_readl(host, SDHCI_CAPABILITIES),
  81                 sdhci_readl(host, SDHCI_MAX_CURRENT));
  82
  83         if (host->flags & SDHCI_USE_ADMA)
  84                 printk(KERN_DEBUG DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
  85                        readl(host->ioaddr + SDHCI_ADMA_ERROR),
  86                        readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
  87
  88         printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
  89 }
  90
  91 /*****************************************************************************\
  92  *                                                                           *
  93  * Low level functions                                                       *
  94  *                                                                           *
  95 \*****************************************************************************/
  96
  97 static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
  98 {
  99         u32 ier;
 100
 101         ier = sdhci_readl(host, SDHCI_INT_ENABLE);
 102         ier &= ~clear;
 103         ier |= set;
 104         sdhci_writel(host, ier, SDHCI_INT_ENABLE);
 105         sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
 106 }
 107
 108 static void sdhci_unmask_irqs(struct sdhci_host *host, u32 irqs)
 109 {
 110         sdhci_clear_set_irqs(host, 0, irqs);
 111 }
 112
 113 static void sdhci_mask_irqs(struct sdhci_host *host, u32 irqs)
 114 {
 115         sdhci_clear_set_irqs(host, irqs, 0);
 116 }
 117
 118 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
 119 {
 120         u32 irqs = SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT;
 121
 122         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
 123                 return;
 124
 125         if (enable)
 126                 sdhci_unmask_irqs(host, irqs);
 127         else
 128                 sdhci_mask_irqs(host, irqs);
 129 }
 130
 131 static void sdhci_enable_card_detection(struct sdhci_host *host)
 132 {
 133         sdhci_set_card_detection(host, true);
 134 }
 135
 136 static void sdhci_disable_card_detection(struct sdhci_host *host)
 137 {
 138         sdhci_set_card_detection(host, false);
 139 }
 140
 141 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 142 {
 143         unsigned long timeout;
 144         u32 uninitialized_var(ier);
 145
 146         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 147                 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
 148                         SDHCI_CARD_PRESENT))
 149                         return;
 150         }
 151
 152         if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
 153                 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
 154
 155         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 156
 157         if (mask & SDHCI_RESET_ALL)
 158                 host->clock = 0;
 159
 160         /* Wait max 100 ms */
 161         timeout = 100;
 162
 163         /* hw clears the bit when it's done */
 164         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
 165                 if (timeout == 0) {
 166                         printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
 167                                 mmc_hostname(host->mmc), (int)mask);
 168                         sdhci_dumpregs(host);
 169                         return;
 170                 }
 171                 timeout--;
 172                 mdelay(1);
 173         }
 174
 175         if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
 176                 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
 177 }
 178
 179 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
 180
 181 static void sdhci_init(struct sdhci_host *host, int soft)
 182 {
 183         if (soft)
 184                 sdhci_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
 185         else
 186                 sdhci_reset(host, SDHCI_RESET_ALL);
 187
 188         sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
 189                 SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 190                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 191                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 192                 SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE);
 193
 194         if (soft) {
 195                 /* force clock reconfiguration */
 196                 host->clock = 0;
 197                 sdhci_set_ios(host->mmc, &host->mmc->ios);
 198         }
 199 }
 200
 201 static void sdhci_reinit(struct sdhci_host *host)
 202 {
 203         sdhci_init(host, 0);
 204         sdhci_enable_card_detection(host);
 205 }
 206
 207 static void sdhci_activate_led(struct sdhci_host *host)
 208 {
 209         u8 ctrl;
 210
 211         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 212         ctrl |= SDHCI_CTRL_LED;
 213         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 214 }
 215
 216 static void sdhci_deactivate_led(struct sdhci_host *host)
 217 {
 218         u8 ctrl;
 219
 220         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 221         ctrl &= ~SDHCI_CTRL_LED;
 222         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 223 }
 224
 225 #ifdef SDHCI_USE_LEDS_CLASS
 226 static void sdhci_led_control(struct led_classdev *led,
 227         enum led_brightness brightness)
 228 {
 229         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 230         unsigned long flags;
 231
 232         spin_lock_irqsave(&host->lock, flags);
 233
 234         if (brightness == LED_OFF)
 235                 sdhci_deactivate_led(host);
 236         else
 237                 sdhci_activate_led(host);
 238
 239         spin_unlock_irqrestore(&host->lock, flags);
 240 }
 241 #endif
 242
 243 /*****************************************************************************\
 244  *                                                                           *
 245  * Core functions                                                            *
 246  *                                                                           *
 247 \*****************************************************************************/
 248
 249 static void sdhci_read_block_pio(struct sdhci_host *host)
 250 {
 251         unsigned long flags;
 252         size_t blksize, len, chunk;
 253         u32 uninitialized_var(scratch);
 254         u8 *buf;
 255
 256         DBG("PIO reading\n");
 257
 258         blksize = host->data->blksz;
 259         chunk = 0;
 260
 261         local_irq_save(flags);
 262
 263         while (blksize) {
 264                 if (!sg_miter_next(&host->sg_miter))
 265                         BUG();
 266
 267                 len = min(host->sg_miter.length, blksize);
 268
 269                 blksize -= len;
 270                 host->sg_miter.consumed = len;
 271
 272                 buf = host->sg_miter.addr;
 273
 274                 while (len) {
 275                         if (chunk == 0) {
 276                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
 277                                 chunk = 4;
 278                         }
 279
 280                         *buf = scratch & 0xFF;
 281
 282                         buf++;
 283                         scratch >>= 8;
 284                         chunk--;
 285                         len--;
 286                 }
 287         }
 288
 289         sg_miter_stop(&host->sg_miter);
 290
 291         local_irq_restore(flags);
 292 }
 293
 294 static void sdhci_write_block_pio(struct sdhci_host *host)
 295 {
 296         unsigned long flags;
 297         size_t blksize, len, chunk;
 298         u32 scratch;
 299         u8 *buf;
 300
 301         DBG("PIO writing\n");
 302
 303         blksize = host->data->blksz;
 304         chunk = 0;
 305         scratch = 0;
 306
 307         local_irq_save(flags);
 308
 309         while (blksize) {
 310                 if (!sg_miter_next(&host->sg_miter))
 311                         BUG();
 312
 313                 len = min(host->sg_miter.length, blksize);
 314
 315                 blksize -= len;
 316                 host->sg_miter.consumed = len;
 317
 318                 buf = host->sg_miter.addr;
 319
 320                 while (len) {
 321                         scratch |= (u32)*buf << (chunk * 8);
 322
 323                         buf++;
 324                         chunk++;
 325                         len--;
 326
 327                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 328                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
 329                                 chunk = 0;
 330                                 scratch = 0;
 331                         }
 332                 }
 333         }
 334
 335         sg_miter_stop(&host->sg_miter);
 336
 337         local_irq_restore(flags);
 338 }
 339
 340 static void sdhci_transfer_pio(struct sdhci_host *host)
 341 {
 342         u32 mask;
 343
 344         BUG_ON(!host->data);
 345
 346         if (host->blocks == 0)
 347                 return;
 348
 349         if (host->data->flags & MMC_DATA_READ)
 350                 mask = SDHCI_DATA_AVAILABLE;
 351         else
 352                 mask = SDHCI_SPACE_AVAILABLE;
 353
 354         /*
 355          * Some controllers (JMicron JMB38x) mess up the buffer bits
 356          * for transfers < 4 bytes. As long as it is just one block,
 357          * we can ignore the bits.
 358          */
 359         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
 360                 (host->data->blocks == 1))
 361                 mask = ~0;
 362
 363         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 364                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 365                         udelay(100);
 366
 367                 if (host->data->flags & MMC_DATA_READ)
 368                         sdhci_read_block_pio(host);
 369                 else
 370                         sdhci_write_block_pio(host);
 371
 372                 host->blocks--;
 373                 if (host->blocks == 0)
 374                         break;
 375         }
 376
 377         DBG("PIO transfer complete.\n");
 378 }
 379
 380 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 381 {
 382         local_irq_save(*flags);
 383         return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
 384 }
 385
 386 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 387 {
 388         kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
 389         local_irq_restore(*flags);
 390 }
 391
 392 static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
 393 {
 394         __le32 *dataddr = (__le32 __force *)(desc + 4);
 395         __le16 *cmdlen = (__le16 __force *)desc;
 396
 397         /* SDHCI specification says ADMA descriptors should be 4 byte
 398          * aligned, so using 16 or 32bit operations should be safe. */
 399
 400         cmdlen[0] = cpu_to_le16(cmd);
 401         cmdlen[1] = cpu_to_le16(len);
 402
 403         dataddr[0] = cpu_to_le32(addr);
 404 }
 405
 406 static int sdhci_adma_table_pre(struct sdhci_host *host,
 407         struct mmc_data *data)
 408 {
 409         int direction;
 410
 411         u8 *desc;
 412         u8 *align;
 413         dma_addr_t addr;
 414         dma_addr_t align_addr;
 415         int len, offset;
 416
 417         struct scatterlist *sg;
 418         int i;
 419         char *buffer;
 420         unsigned long flags;
 421
 422         /*
 423          * The spec does not specify endianness of descriptor table.
 424          * We currently guess that it is LE.
 425          */
 426
 427         if (data->flags & MMC_DATA_READ)
 428                 direction = DMA_FROM_DEVICE;
 429         else
 430                 direction = DMA_TO_DEVICE;
 431
 432         /*
 433          * The ADMA descriptor table is mapped further down as we
 434          * need to fill it with data first.
 435          */
 436
 437         host->align_addr = dma_map_single(mmc_dev(host->mmc),
 438                 host->align_buffer, 128 * 4, direction);
 439         if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
 440                 goto fail;
 441         BUG_ON(host->align_addr & 0x3);
 442
 443         host->sg_count = dma_map_sg(mmc_dev(host->mmc),
 444                 data->sg, data->sg_len, direction);
 445         if (host->sg_count == 0)
 446                 goto unmap_align;
 447
 448         desc = host->adma_desc;
 449         align = host->align_buffer;
 450
 451         align_addr = host->align_addr;
 452
 453         for_each_sg(data->sg, sg, host->sg_count, i) {
 454                 addr = sg_dma_address(sg);
 455                 len = sg_dma_len(sg);
 456
 457                 /*
 458                  * The SDHCI specification states that ADMA
 459                  * addresses must be 32-bit aligned. If they
 460                  * aren't, then we use a bounce buffer for
 461                  * the (up to three) bytes that screw up the
 462                  * alignment.
 463                  */
 464                 offset = (4 - (addr & 0x3)) & 0x3;
 465                 if (offset) {
 466                         if (data->flags & MMC_DATA_WRITE) {
 467                                 buffer = sdhci_kmap_atomic(sg, &flags);
 468                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 469                                 memcpy(align, buffer, offset);
 470                                 sdhci_kunmap_atomic(buffer, &flags);
 471                         }
 472
 473                         /* tran, valid */
 474                         sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
 475
 476                         BUG_ON(offset > 65536);
 477
 478                         align += 4;
 479                         align_addr += 4;
 480
 481                         desc += 8;
 482
 483                         addr += offset;
 484                         len -= offset;
 485                 }
 486
 487                 BUG_ON(len > 65536);
 488
 489                 /* tran, valid */
 490                 sdhci_set_adma_desc(desc, addr, len, 0x21);
 491                 desc += 8;
 492
 493                 /*
 494                  * If this triggers then we have a calculation bug
 495                  * somewhere. :/
 496                  */
 497                 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
 498         }
 499
 500         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
 501                 /*
 502                 * Mark the last descriptor as the terminating descriptor
 503                 */
 504                 if (desc != host->adma_desc) {
 505                         desc -= 8;
 506                         desc[0] |= 0x2; /* end */
 507                 }
 508         } else {
 509                 /*
 510                 * Add a terminating entry.
 511                 */
 512
 513                 /* nop, end, valid */
 514                 sdhci_set_adma_desc(desc, 0, 0, 0x3);
 515         }
 516
 517         /*
 518          * Resync align buffer as we might have changed it.
 519          */
 520         if (data->flags & MMC_DATA_WRITE) {
 521                 dma_sync_single_for_device(mmc_dev(host->mmc),
 522                         host->align_addr, 128 * 4, direction);
 523         }
 524
 525         host->adma_addr = dma_map_single(mmc_dev(host->mmc),
 526                 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
 527         if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr))
 528                 goto unmap_entries;
 529         BUG_ON(host->adma_addr & 0x3);
 530
 531         return 0;
 532
 533 unmap_entries:
 534         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 535                 data->sg_len, direction);
 536 unmap_align:
 537         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 538                 128 * 4, direction);
 539 fail:
 540         return -EINVAL;
 541 }
 542
 543 static void sdhci_adma_table_post(struct sdhci_host *host,
 544         struct mmc_data *data)
 545 {
 546         int direction;
 547
 548         struct scatterlist *sg;
 549         int i, size;
 550         u8 *align;
 551         char *buffer;
 552         unsigned long flags;
 553
 554         if (data->flags & MMC_DATA_READ)
 555                 direction = DMA_FROM_DEVICE;
 556         else
 557                 direction = DMA_TO_DEVICE;
 558
 559         dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
 560                 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
 561
 562         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 563                 128 * 4, direction);
 564
 565         if (data->flags & MMC_DATA_READ) {
 566                 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 567                         data->sg_len, direction);
 568
 569                 align = host->align_buffer;
 570
 571                 for_each_sg(data->sg, sg, host->sg_count, i) {
 572                         if (sg_dma_address(sg) & 0x3) {
 573                                 size = 4 - (sg_dma_address(sg) & 0x3);
 574
 575                                 buffer = sdhci_kmap_atomic(sg, &flags);
 576                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 577                                 memcpy(buffer, align, size);
 578                                 sdhci_kunmap_atomic(buffer, &flags);
 579
 580                                 align += 4;
 581                         }
 582                 }
 583         }
 584
 585         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 586                 data->sg_len, direction);
 587 }
 588
 589 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data)
 590 {
 591         u8 count;
 592         unsigned target_timeout, current_timeout;
 593
 594         /*
 595          * If the host controller provides us with an incorrect timeout
 596          * value, just skip the check and use 0xE.  The hardware may take
 597          * longer to time out, but that's much better than having a too-short
 598          * timeout value.
 599          */
 600         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
 601                 return 0xE;
 602
 603         /* timeout in us */
 604         target_timeout = data->timeout_ns / 1000 +
 605                 data->timeout_clks / host->clock;
 606
 607         if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)
 608                 host->timeout_clk = host->clock / 1000;
 609
 610         /*
 611          * Figure out needed cycles.
 612          * We do this in steps in order to fit inside a 32 bit int.
 613          * The first step is the minimum timeout, which will have a
 614          * minimum resolution of 6 bits:
 615          * (1) 2^13*1000 > 2^22,
 616          * (2) host->timeout_clk < 2^16
 617          *     =>
 618          *     (1) / (2) > 2^6
 619          */
 620         count = 0;
 621         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 622         while (current_timeout < target_timeout) {
 623                 count++;
 624                 current_timeout <<= 1;
 625                 if (count >= 0xF)
 626                         break;
 627         }
 628
 629         if (count >= 0xF) {
 630                 printk(KERN_WARNING "%s: Too large timeout requested!\n",
 631                         mmc_hostname(host->mmc));
 632                 count = 0xE;
 633         }
 634
 635         return count;
 636 }
 637
 638 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 639 {
 640         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 641         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 642
 643         if (host->flags & SDHCI_REQ_USE_DMA)
 644                 sdhci_clear_set_irqs(host, pio_irqs, dma_irqs);
 645         else
 646                 sdhci_clear_set_irqs(host, dma_irqs, pio_irqs);
 647 }
 648
 649 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 650 {
 651         u8 count;
 652         u8 ctrl;
 653         int ret;
 654
 655         WARN_ON(host->data);
 656
 657         if (data == NULL)
 658                 return;
 659
 660         /* Sanity checks */
 661         BUG_ON(data->blksz * data->blocks > 524288);
 662         BUG_ON(data->blksz > host->mmc->max_blk_size);
 663         BUG_ON(data->blocks > 65535);
 664
 665         host->data = data;
 666         host->data_early = 0;
 667
 668         count = sdhci_calc_timeout(host, data);
 669         sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
 670
 671         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
 672                 host->flags |= SDHCI_REQ_USE_DMA;
 673
 674         /*
 675          * FIXME: This doesn't account for merging when mapping the
 676          * scatterlist.
 677          */
 678         if (host->flags & SDHCI_REQ_USE_DMA) {
 679                 int broken, i;
 680                 struct scatterlist *sg;
 681
 682                 broken = 0;
 683                 if (host->flags & SDHCI_USE_ADMA) {
 684                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 685                                 broken = 1;
 686                 } else {
 687                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
 688                                 broken = 1;
 689                 }
 690
 691                 if (unlikely(broken)) {
 692                         for_each_sg(data->sg, sg, data->sg_len, i) {
 693                                 if (sg->length & 0x3) {
 694                                         DBG("Reverting to PIO because of "
 695                                                 "transfer size (%d)\n",
 696                                                 sg->length);
 697                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 698                                         break;
 699                                 }
 700                         }
 701                 }
 702         }
 703
 704         /*
 705          * The assumption here being that alignment is the same after
 706          * translation to device address space.
 707          */
 708         if (host->flags & SDHCI_REQ_USE_DMA) {
 709                 int broken, i;
 710                 struct scatterlist *sg;
 711
 712                 broken = 0;
 713                 if (host->flags & SDHCI_USE_ADMA) {
 714                         /*
 715                          * As we use 3 byte chunks to work around
 716                          * alignment problems, we need to check this
 717                          * quirk.
 718                          */
 719                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 720                                 broken = 1;
 721                 } else {
 722                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
 723                                 broken = 1;
 724                 }
 725
 726                 if (unlikely(broken)) {
 727                         for_each_sg(data->sg, sg, data->sg_len, i) {
 728                                 if (sg->offset & 0x3) {
 729                                         DBG("Reverting to PIO because of "
 730                                                 "bad alignment\n");
 731                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 732                                         break;
 733                                 }
 734                         }
 735                 }
 736         }
 737
 738         if (host->flags & SDHCI_REQ_USE_DMA) {
 739                 if (host->flags & SDHCI_USE_ADMA) {
 740                         ret = sdhci_adma_table_pre(host, data);
 741                         if (ret) {
 742                                 /*
 743                                  * This only happens when someone fed
 744                                  * us an invalid request.
 745                                  */
 746                                 WARN_ON(1);
 747                                 host->flags &= ~SDHCI_REQ_USE_DMA;
 748                         } else {
 749                                 sdhci_writel(host, host->adma_addr,
 750                                         SDHCI_ADMA_ADDRESS);
 751                         }
 752                 } else {
 753                         int sg_cnt;
 754
 755                         sg_cnt = dma_map_sg(mmc_dev(host->mmc),
 756                                         data->sg, data->sg_len,
 757                                         (data->flags & MMC_DATA_READ) ?
 758                                                 DMA_FROM_DEVICE :
 759                                                 DMA_TO_DEVICE);
 760                         if (sg_cnt == 0) {
 761                                 /*
 762                                  * This only happens when someone fed
 763                                  * us an invalid request.
 764                                  */
 765                                 WARN_ON(1);
 766                                 host->flags &= ~SDHCI_REQ_USE_DMA;
 767                         } else {
 768                                 WARN_ON(sg_cnt != 1);
 769                                 sdhci_writel(host, sg_dma_address(data->sg),
 770                                         SDHCI_DMA_ADDRESS);
 771                         }
 772                 }
 773         }
 774
 775         /*
 776          * Always adjust the DMA selection as some controllers
 777          * (e.g. JMicron) can't do PIO properly when the selection
 778          * is ADMA.
 779          */
 780         if (host->version >= SDHCI_SPEC_200) {
 781                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 782                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
 783                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
 784                         (host->flags & SDHCI_USE_ADMA))
 785                         ctrl |= SDHCI_CTRL_ADMA32;
 786                 else
 787                         ctrl |= SDHCI_CTRL_SDMA;
 788                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 789         }
 790
 791         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
 792                 int flags;
 793
 794                 flags = SG_MITER_ATOMIC;
 795                 if (host->data->flags & MMC_DATA_READ)
 796                         flags |= SG_MITER_TO_SG;
 797                 else
 798                         flags |= SG_MITER_FROM_SG;
 799                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
 800                 host->blocks = data->blocks;
 801         }
 802
 803         sdhci_set_transfer_irqs(host);
 804
 805         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
 806         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, data->blksz), SDHCI_BLOCK_SIZE);
 807         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 808 }
 809
 810 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 811         struct mmc_data *data)
 812 {
 813         u16 mode;
 814
 815         if (data == NULL)
 816                 return;
 817
 818         WARN_ON(!host->data);
 819
 820         mode = SDHCI_TRNS_BLK_CNT_EN;
 821         if (data->blocks > 1) {
 822                 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
 823                         mode |= SDHCI_TRNS_MULTI | SDHCI_TRNS_ACMD12;
 824                 else
 825                         mode |= SDHCI_TRNS_MULTI;
 826         }
 827         if (data->flags & MMC_DATA_READ)
 828                 mode |= SDHCI_TRNS_READ;
 829         if (host->flags & SDHCI_REQ_USE_DMA)
 830                 mode |= SDHCI_TRNS_DMA;
 831
 832         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 833 }
 834
 835 static void sdhci_finish_data(struct sdhci_host *host)
 836 {
 837         struct mmc_data *data;
 838
 839         BUG_ON(!host->data);
 840
 841         data = host->data;
 842         host->data = NULL;
 843
 844         if (host->flags & SDHCI_REQ_USE_DMA) {
 845                 if (host->flags & SDHCI_USE_ADMA)
 846                         sdhci_adma_table_post(host, data);
 847                 else {
 848                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 849                                 data->sg_len, (data->flags & MMC_DATA_READ) ?
 850                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
 851                 }
 852         }
 853
 854         /*
 855          * The specification states that the block count register must
 856          * be updated, but it does not specify at what point in the
 857          * data flow. That makes the register entirely useless to read
 858          * back so we have to assume that nothing made it to the card
 859          * in the event of an error.
 860          */
 861         if (data->error)
 862                 data->bytes_xfered = 0;
 863         else
 864                 data->bytes_xfered = data->blksz * data->blocks;
 865
 866         if (data->stop) {
 867                 /*
 868                  * The controller needs a reset of internal state machines
 869                  * upon error conditions.
 870                  */
 871                 if (data->error) {
 872                         sdhci_reset(host, SDHCI_RESET_CMD);
 873                         sdhci_reset(host, SDHCI_RESET_DATA);
 874                 }
 875
 876                 sdhci_send_command(host, data->stop);
 877         } else
 878                 tasklet_schedule(&host->finish_tasklet);
 879 }
 880
 881 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 882 {
 883         int flags;
 884         u32 mask;
 885         unsigned long timeout;
 886
 887         WARN_ON(host->cmd);
 888
 889         /* Wait max 10 ms */
 890         timeout = 10;
 891
 892         mask = SDHCI_CMD_INHIBIT;
 893         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 894                 mask |= SDHCI_DATA_INHIBIT;
 895
 896         /* We shouldn't wait for data inihibit for stop commands, even
 897            though they might use busy signaling */
 898         if (host->mrq->data && (cmd == host->mrq->data->stop))
 899                 mask &= ~SDHCI_DATA_INHIBIT;
 900
 901         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 902                 if (timeout == 0) {
 903                         printk(KERN_ERR "%s: Controller never released "
 904                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 905                         sdhci_dumpregs(host);
 906                         cmd->error = -EIO;
 907                         tasklet_schedule(&host->finish_tasklet);
 908                         return;
 909                 }
 910                 timeout--;
 911                 mdelay(1);
 912         }
 913
 914         mod_timer(&host->timer, jiffies + 10 * HZ);
 915
 916         host->cmd = cmd;
 917
 918         sdhci_prepare_data(host, cmd->data);
 919
 920         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
 921
 922         sdhci_set_transfer_mode(host, cmd->data);
 923
 924         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
 925                 printk(KERN_ERR "%s: Unsupported response type!\n",
 926                         mmc_hostname(host->mmc));
 927                 cmd->error = -EINVAL;
 928                 tasklet_schedule(&host->finish_tasklet);
 929                 return;
 930         }
 931
 932         if (!(cmd->flags & MMC_RSP_PRESENT))
 933                 flags = SDHCI_CMD_RESP_NONE;
 934         else if (cmd->flags & MMC_RSP_136)
 935                 flags = SDHCI_CMD_RESP_LONG;
 936         else if (cmd->flags & MMC_RSP_BUSY)
 937                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
 938         else
 939                 flags = SDHCI_CMD_RESP_SHORT;
 940
 941         if (cmd->flags & MMC_RSP_CRC)
 942                 flags |= SDHCI_CMD_CRC;
 943         if (cmd->flags & MMC_RSP_OPCODE)
 944                 flags |= SDHCI_CMD_INDEX;
 945         if (cmd->data)
 946                 flags |= SDHCI_CMD_DATA;
 947
 948         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
 949 }
 950
 951 static void sdhci_finish_command(struct sdhci_host *host)
 952 {
 953         int i;
 954
 955         BUG_ON(host->cmd == NULL);
 956
 957         if (host->cmd->flags & MMC_RSP_PRESENT) {
 958                 if (host->cmd->flags & MMC_RSP_136) {
 959                         /* CRC is stripped so we need to do some shifting. */
 960                         for (i = 0;i < 4;i++) {
 961                                 host->cmd->resp[i] = sdhci_readl(host,
 962                                         SDHCI_RESPONSE + (3-i)*4) << 8;
 963                                 if (i != 3)
 964                                         host->cmd->resp[i] |=
 965                                                 sdhci_readb(host,
 966                                                 SDHCI_RESPONSE + (3-i)*4-1);
 967                         }
 968                 } else {
 969                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
 970                 }
 971         }
 972
 973         host->cmd->error = 0;
 974
 975         if (host->data && host->data_early)
 976                 sdhci_finish_data(host);
 977
 978         if (!host->cmd->data)
 979                 tasklet_schedule(&host->finish_tasklet);
 980
 981         host->cmd = NULL;
 982 }
 983
 984 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 985 {
 986         int div;
 987         u16 clk;
 988         unsigned long timeout;
 989
 990         if (clock == host->clock)
 991                 return;
 992
 993         if (host->ops->set_clock) {
 994                 host->ops->set_clock(host, clock);
 995                 if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK)
 996                         return;
 997         }
 998
 999         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1000
1001         if (clock == 0)
1002                 goto out;
1003
1004         if (host->version >= SDHCI_SPEC_300) {
1005                 /* Version 3.00 divisors must be a multiple of 2. */
1006                 if (host->max_clk <= clock)
1007                         div = 1;
1008                 else {
1009                         for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
1010                                 if ((host->max_clk / div) <= clock)
1011                                         break;
1012                         }
1013                 }
1014         } else {
1015                 /* Version 2.00 divisors must be a power of 2. */
1016                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1017                         if ((host->max_clk / div) <= clock)
1018                                 break;
1019                 }
1020         }
1021         div >>= 1;
1022
1023         clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1024         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1025                 << SDHCI_DIVIDER_HI_SHIFT;
1026         clk |= SDHCI_CLOCK_INT_EN;
1027         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1028
1029         /* Wait max 20 ms */
1030         timeout = 20;
1031         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1032                 & SDHCI_CLOCK_INT_STABLE)) {
1033                 if (timeout == 0) {
1034                         printk(KERN_ERR "%s: Internal clock never "
1035                                 "stabilised.\n", mmc_hostname(host->mmc));
1036                         sdhci_dumpregs(host);
1037                         return;
1038                 }
1039                 timeout--;
1040                 mdelay(1);
1041         }
1042
1043         clk |= SDHCI_CLOCK_CARD_EN;
1044         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1045
1046 out:
1047         host->clock = clock;
1048 }
1049
1050 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
1051 {
1052         u8 pwr;
1053
1054         if (power == (unsigned short)-1)
1055                 pwr = 0;
1056         else {
1057                 switch (1 << power) {
1058                 case MMC_VDD_165_195:
1059                         pwr = SDHCI_POWER_180;
1060                         break;
1061                 case MMC_VDD_29_30:
1062                 case MMC_VDD_30_31:
1063                         pwr = SDHCI_POWER_300;
1064                         break;
1065                 case MMC_VDD_32_33:
1066                 case MMC_VDD_33_34:
1067                         pwr = SDHCI_POWER_330;
1068                         break;
1069                 default:
1070                         BUG();
1071                 }
1072         }
1073
1074         if (host->pwr == pwr)
1075                 return;
1076
1077         host->pwr = pwr;
1078
1079         if (pwr == 0) {
1080                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1081                 return;
1082         }
1083
1084         /*
1085          * Spec says that we should clear the power reg before setting
1086          * a new value. Some controllers don't seem to like this though.
1087          */
1088         if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1089                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1090
1091         /*
1092          * At least the Marvell CaFe chip gets confused if we set the voltage
1093          * and set turn on power at the same time, so set the voltage first.
1094          */
1095         if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1096                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1097
1098         pwr |= SDHCI_POWER_ON;
1099
1100         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1101
1102         /*
1103          * Some controllers need an extra 10ms delay of 10ms before they
1104          * can apply clock after applying power
1105          */
1106         if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1107                 mdelay(10);
1108 }
1109
1110 /*****************************************************************************\
1111  *                                                                           *
1112  * MMC callbacks                                                             *
1113  *                                                                           *
1114 \*****************************************************************************/
1115
1116 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1117 {
1118         struct sdhci_host *host;
1119         bool present;
1120         unsigned long flags;
1121
1122         host = mmc_priv(mmc);
1123
1124         spin_lock_irqsave(&host->lock, flags);
1125
1126         WARN_ON(host->mrq != NULL);
1127
1128 #ifndef SDHCI_USE_LEDS_CLASS
1129         sdhci_activate_led(host);
1130 #endif
1131         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) {
1132                 if (mrq->stop) {
1133                         mrq->data->stop = NULL;
1134                         mrq->stop = NULL;
1135                 }
1136         }
1137
1138         host->mrq = mrq;
1139
1140         /* If polling, assume that the card is always present. */
1141         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1142                 present = true;
1143         else
1144                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1145                                 SDHCI_CARD_PRESENT;
1146
1147         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1148                 host->mrq->cmd->error = -ENOMEDIUM;
1149                 tasklet_schedule(&host->finish_tasklet);
1150         } else
1151                 sdhci_send_command(host, mrq->cmd);
1152
1153         mmiowb();
1154         spin_unlock_irqrestore(&host->lock, flags);
1155 }
1156
1157 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1158 {
1159         struct sdhci_host *host;
1160         unsigned long flags;
1161         u8 ctrl;
1162
1163         host = mmc_priv(mmc);
1164
1165         spin_lock_irqsave(&host->lock, flags);
1166
1167         if (host->flags & SDHCI_DEVICE_DEAD)
1168                 goto out;
1169
1170         /*
1171          * Reset the chip on each power off.
1172          * Should clear out any weird states.
1173          */
1174         if (ios->power_mode == MMC_POWER_OFF) {
1175                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1176                 sdhci_reinit(host);
1177         }
1178
1179         sdhci_set_clock(host, ios->clock);
1180
1181         if (ios->power_mode == MMC_POWER_OFF)
1182                 sdhci_set_power(host, -1);
1183         else
1184                 sdhci_set_power(host, ios->vdd);
1185
1186         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1187
1188         if (ios->bus_width == MMC_BUS_WIDTH_8)
1189                 ctrl |= SDHCI_CTRL_8BITBUS;
1190         else
1191                 ctrl &= ~SDHCI_CTRL_8BITBUS;
1192
1193         if (ios->bus_width == MMC_BUS_WIDTH_4)
1194                 ctrl |= SDHCI_CTRL_4BITBUS;
1195         else
1196                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1197
1198         if (ios->timing == MMC_TIMING_SD_HS &&
1199             !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1200                 ctrl |= SDHCI_CTRL_HISPD;
1201         else
1202                 ctrl &= ~SDHCI_CTRL_HISPD;
1203
1204         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1205
1206         /*
1207          * Some (ENE) controllers go apeshit on some ios operation,
1208          * signalling timeout and CRC errors even on CMD0. Resetting
1209          * it on each ios seems to solve the problem.
1210          */
1211         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1212                 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1213
1214 out:
1215         mmiowb();
1216         spin_unlock_irqrestore(&host->lock, flags);
1217 }
1218
1219 static int sdhci_get_ro(struct mmc_host *mmc)
1220 {
1221         struct sdhci_host *host;
1222         unsigned long flags;
1223         int present;
1224
1225         host = mmc_priv(mmc);
1226
1227         spin_lock_irqsave(&host->lock, flags);
1228
1229         if (host->flags & SDHCI_DEVICE_DEAD)
1230                 present = 0;
1231         else
1232                 present = sdhci_readl(host, SDHCI_PRESENT_STATE);
1233
1234         spin_unlock_irqrestore(&host->lock, flags);
1235
1236         if (host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT)
1237                 return !!(present & SDHCI_WRITE_PROTECT);
1238         return !(present & SDHCI_WRITE_PROTECT);
1239 }
1240
1241 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1242 {
1243         struct sdhci_host *host;
1244         unsigned long flags;
1245
1246         host = mmc_priv(mmc);
1247
1248         spin_lock_irqsave(&host->lock, flags);
1249
1250         if (host->flags & SDHCI_DEVICE_DEAD)
1251                 goto out;
1252
1253         if (enable)
1254                 sdhci_unmask_irqs(host, SDHCI_INT_CARD_INT);
1255         else
1256                 sdhci_mask_irqs(host, SDHCI_INT_CARD_INT);
1257 out:
1258         mmiowb();
1259
1260         spin_unlock_irqrestore(&host->lock, flags);
1261 }
1262
1263 static const struct mmc_host_ops sdhci_ops = {
1264         .request        = sdhci_request,
1265         .set_ios        = sdhci_set_ios,
1266         .get_ro         = sdhci_get_ro,
1267         .enable_sdio_irq = sdhci_enable_sdio_irq,
1268 };
1269
1270 /*****************************************************************************\
1271  *                                                                           *
1272  * Tasklets                                                                  *
1273  *                                                                           *
1274 \*****************************************************************************/
1275
1276 static void sdhci_tasklet_card(unsigned long param)
1277 {
1278         struct sdhci_host *host;
1279         unsigned long flags;
1280
1281         host = (struct sdhci_host*)param;
1282
1283         spin_lock_irqsave(&host->lock, flags);
1284
1285         if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
1286                 if (host->mrq) {
1287                         printk(KERN_ERR "%s: Card removed during transfer!\n",
1288                                 mmc_hostname(host->mmc));
1289                         printk(KERN_ERR "%s: Resetting controller.\n",
1290                                 mmc_hostname(host->mmc));
1291
1292                         sdhci_reset(host, SDHCI_RESET_CMD);
1293                         sdhci_reset(host, SDHCI_RESET_DATA);
1294
1295                         host->mrq->cmd->error = -ENOMEDIUM;
1296                         tasklet_schedule(&host->finish_tasklet);
1297                 }
1298         }
1299
1300         spin_unlock_irqrestore(&host->lock, flags);
1301
1302         mmc_detect_change(host->mmc, msecs_to_jiffies(200));
1303 }
1304
1305 static void sdhci_tasklet_finish(unsigned long param)
1306 {
1307         struct sdhci_host *host;
1308         unsigned long flags;
1309         struct mmc_request *mrq;
1310
1311         host = (struct sdhci_host*)param;
1312
1313         spin_lock_irqsave(&host->lock, flags);
1314
1315         del_timer(&host->timer);
1316
1317         mrq = host->mrq;
1318
1319         /*
1320          * The controller needs a reset of internal state machines
1321          * upon error conditions.
1322          */
1323         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
1324                 (mrq->cmd->error ||
1325                  (mrq->data && (mrq->data->error ||
1326                   (mrq->data->stop && mrq->data->stop->error))) ||
1327                    (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
1328
1329                 /* Some controllers need this kick or reset won't work here */
1330                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
1331                         unsigned int clock;
1332
1333                         /* This is to force an update */
1334                         clock = host->clock;
1335                         host->clock = 0;
1336                         sdhci_set_clock(host, clock);
1337                 }
1338
1339                 /* Spec says we should do both at the same time, but Ricoh
1340                    controllers do not like that. */
1341                 sdhci_reset(host, SDHCI_RESET_CMD);
1342                 sdhci_reset(host, SDHCI_RESET_DATA);
1343         }
1344
1345         host->mrq = NULL;
1346         host->cmd = NULL;
1347         host->data = NULL;
1348
1349 #ifndef SDHCI_USE_LEDS_CLASS
1350         sdhci_deactivate_led(host);
1351 #endif
1352
1353         mmiowb();
1354         spin_unlock_irqrestore(&host->lock, flags);
1355
1356         mmc_request_done(host->mmc, mrq);
1357 }
1358
1359 static void sdhci_timeout_timer(unsigned long data)
1360 {
1361         struct sdhci_host *host;
1362         unsigned long flags;
1363
1364         host = (struct sdhci_host*)data;
1365
1366         spin_lock_irqsave(&host->lock, flags);
1367
1368         if (host->mrq) {
1369                 printk(KERN_ERR "%s: Timeout waiting for hardware "
1370                         "interrupt.\n", mmc_hostname(host->mmc));
1371                 sdhci_dumpregs(host);
1372
1373                 if (host->data) {
1374                         host->data->error = -ETIMEDOUT;
1375                         sdhci_finish_data(host);
1376                 } else {
1377                         if (host->cmd)
1378                                 host->cmd->error = -ETIMEDOUT;
1379                         else
1380                                 host->mrq->cmd->error = -ETIMEDOUT;
1381
1382                         tasklet_schedule(&host->finish_tasklet);
1383                 }
1384         }
1385
1386         mmiowb();
1387         spin_unlock_irqrestore(&host->lock, flags);
1388 }
1389
1390 /*****************************************************************************\
1391  *                                                                           *
1392  * Interrupt handling                                                        *
1393  *                                                                           *
1394 \*****************************************************************************/
1395
1396 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
1397 {
1398         BUG_ON(intmask == 0);
1399
1400         if (!host->cmd) {
1401                 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
1402                         "though no command operation was in progress.\n",
1403                         mmc_hostname(host->mmc), (unsigned)intmask);
1404                 sdhci_dumpregs(host);
1405                 return;
1406         }
1407
1408         if (intmask & SDHCI_INT_TIMEOUT)
1409                 host->cmd->error = -ETIMEDOUT;
1410         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
1411                         SDHCI_INT_INDEX))
1412                 host->cmd->error = -EILSEQ;
1413
1414         if (host->cmd->error) {
1415                 tasklet_schedule(&host->finish_tasklet);
1416                 return;
1417         }
1418
1419         /*
1420          * The host can send and interrupt when the busy state has
1421          * ended, allowing us to wait without wasting CPU cycles.
1422          * Unfortunately this is overloaded on the "data complete"
1423          * interrupt, so we need to take some care when handling
1424          * it.
1425          *
1426          * Note: The 1.0 specification is a bit ambiguous about this
1427          *       feature so there might be some problems with older
1428          *       controllers.
1429          */
1430         if (host->cmd->flags & MMC_RSP_BUSY) {
1431                 if (host->cmd->data)
1432                         DBG("Cannot wait for busy signal when also "
1433                                 "doing a data transfer");
1434                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
1435                         return;
1436
1437                 /* The controller does not support the end-of-busy IRQ,
1438                  * fall through and take the SDHCI_INT_RESPONSE */
1439         }
1440
1441         if (intmask & SDHCI_INT_RESPONSE)
1442                 sdhci_finish_command(host);
1443 }
1444
1445 #ifdef CONFIG_MMC_DEBUG
1446 static void sdhci_show_adma_error(struct sdhci_host *host)
1447 {
1448         const char *name = mmc_hostname(host->mmc);
1449         u8 *desc = host->adma_desc;
1450         __le32 *dma;
1451         __le16 *len;
1452         u8 attr;
1453
1454         sdhci_dumpregs(host);
1455
1456         while (true) {
1457                 dma = (__le32 *)(desc + 4);
1458                 len = (__le16 *)(desc + 2);
1459                 attr = *desc;
1460
1461                 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
1462                     name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr);
1463
1464                 desc += 8;
1465
1466                 if (attr & 2)
1467                         break;
1468         }
1469 }
1470 #else
1471 static void sdhci_show_adma_error(struct sdhci_host *host) { }
1472 #endif
1473
1474 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
1475 {
1476         BUG_ON(intmask == 0);
1477
1478         if (!host->data) {
1479                 /*
1480                  * The "data complete" interrupt is also used to
1481                  * indicate that a busy state has ended. See comment
1482                  * above in sdhci_cmd_irq().
1483                  */
1484                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
1485                         if (intmask & SDHCI_INT_DATA_END) {
1486                                 sdhci_finish_command(host);
1487                                 return;
1488                         }
1489                 }
1490
1491                 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
1492                         "though no data operation was in progress.\n",
1493                         mmc_hostname(host->mmc), (unsigned)intmask);
1494                 sdhci_dumpregs(host);
1495
1496                 return;
1497         }
1498
1499         if (intmask & SDHCI_INT_DATA_TIMEOUT)
1500                 host->data->error = -ETIMEDOUT;
1501         else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
1502                 host->data->error = -EILSEQ;
1503         else if (intmask & SDHCI_INT_ADMA_ERROR) {
1504                 printk(KERN_ERR "%s: ADMA error\n", mmc_hostname(host->mmc));
1505                 sdhci_show_adma_error(host);
1506                 host->data->error = -EIO;
1507         }
1508
1509         if (host->data->error)
1510                 sdhci_finish_data(host);
1511         else {
1512                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1513                         sdhci_transfer_pio(host);
1514
1515                 /*
1516                  * We currently don't do anything fancy with DMA
1517                  * boundaries, but as we can't disable the feature
1518                  * we need to at least restart the transfer.
1519                  */
1520                 if (intmask & SDHCI_INT_DMA_END)
1521                         sdhci_writel(host, sdhci_readl(host, SDHCI_DMA_ADDRESS),
1522                                 SDHCI_DMA_ADDRESS);
1523
1524                 if (intmask & SDHCI_INT_DATA_END) {
1525                         if (host->cmd) {
1526                                 /*
1527                                  * Data managed to finish before the
1528                                  * command completed. Make sure we do
1529                                  * things in the proper order.
1530                                  */
1531                                 host->data_early = 1;
1532                         } else {
1533                                 sdhci_finish_data(host);
1534                         }
1535                 }
1536         }
1537 }
1538
1539 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1540 {
1541         irqreturn_t result;
1542         struct sdhci_host* host = dev_id;
1543         u32 intmask;
1544         int cardint = 0;
1545
1546         spin_lock(&host->lock);
1547
1548         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
1549
1550         if (!intmask || intmask == 0xffffffff) {
1551                 result = IRQ_NONE;
1552                 goto out;
1553         }
1554
1555         DBG("*** %s got interrupt: 0x%08x\n",
1556                 mmc_hostname(host->mmc), intmask);
1557
1558         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1559                 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
1560                         SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
1561                 tasklet_schedule(&host->card_tasklet);
1562         }
1563
1564         intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1565
1566         if (intmask & SDHCI_INT_CMD_MASK) {
1567                 sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK,
1568                         SDHCI_INT_STATUS);
1569                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1570         }
1571
1572         if (intmask & SDHCI_INT_DATA_MASK) {
1573                 sdhci_writel(host, intmask & SDHCI_INT_DATA_MASK,
1574                         SDHCI_INT_STATUS);
1575                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1576         }
1577
1578         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1579
1580         intmask &= ~SDHCI_INT_ERROR;
1581
1582         if (intmask & SDHCI_INT_BUS_POWER) {
1583                 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1584                         mmc_hostname(host->mmc));
1585                 sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS);
1586         }
1587
1588         intmask &= ~SDHCI_INT_BUS_POWER;
1589
1590         if (intmask & SDHCI_INT_CARD_INT)
1591                 cardint = 1;
1592
1593         intmask &= ~SDHCI_INT_CARD_INT;
1594
1595         if (intmask) {
1596                 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1597                         mmc_hostname(host->mmc), intmask);
1598                 sdhci_dumpregs(host);
1599
1600                 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
1601         }
1602
1603         result = IRQ_HANDLED;
1604
1605         mmiowb();
1606 out:
1607         spin_unlock(&host->lock);
1608
1609         /*
1610          * We have to delay this as it calls back into the driver.
1611          */
1612         if (cardint)
1613                 mmc_signal_sdio_irq(host->mmc);
1614
1615         return result;
1616 }
1617
1618 /*****************************************************************************\
1619  *                                                                           *
1620  * Suspend/resume                                                            *
1621  *                                                                           *
1622 \*****************************************************************************/
1623
1624 #ifdef CONFIG_PM
1625
1626 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1627 {
1628         int ret;
1629
1630         sdhci_disable_card_detection(host);
1631
1632         ret = mmc_suspend_host(host->mmc);
1633         if (ret)
1634                 return ret;
1635
1636         free_irq(host->irq, host);
1637
1638         if (host->vmmc)
1639                 ret = regulator_disable(host->vmmc);
1640
1641         return ret;
1642 }
1643
1644 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1645
1646 int sdhci_resume_host(struct sdhci_host *host)
1647 {
1648         int ret;
1649
1650         if (host->vmmc) {
1651                 int ret = regulator_enable(host->vmmc);
1652                 if (ret)
1653                         return ret;
1654         }
1655
1656
1657         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
1658                 if (host->ops->enable_dma)
1659                         host->ops->enable_dma(host);
1660         }
1661
1662         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1663                           mmc_hostname(host->mmc), host);
1664         if (ret)
1665                 return ret;
1666
1667         sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
1668         mmiowb();
1669
1670         ret = mmc_resume_host(host->mmc);
1671         sdhci_enable_card_detection(host);
1672
1673         return ret;
1674 }
1675
1676 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1677
1678 #endif /* CONFIG_PM */
1679
1680 /*****************************************************************************\
1681  *                                                                           *
1682  * Device allocation/registration                                            *
1683  *                                                                           *
1684 \*****************************************************************************/
1685
1686 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1687         size_t priv_size)
1688 {
1689         struct mmc_host *mmc;
1690         struct sdhci_host *host;
1691
1692         WARN_ON(dev == NULL);
1693
1694         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1695         if (!mmc)
1696                 return ERR_PTR(-ENOMEM);
1697
1698         host = mmc_priv(mmc);
1699         host->mmc = mmc;
1700
1701         return host;
1702 }
1703
1704 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1705
1706 int sdhci_add_host(struct sdhci_host *host)
1707 {
1708         struct mmc_host *mmc;
1709         unsigned int caps;
1710         int ret;
1711
1712         WARN_ON(host == NULL);
1713         if (host == NULL)
1714                 return -EINVAL;
1715
1716         mmc = host->mmc;
1717
1718         if (debug_quirks)
1719                 host->quirks = debug_quirks;
1720
1721         sdhci_reset(host, SDHCI_RESET_ALL);
1722
1723         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
1724         host->version = (host->version & SDHCI_SPEC_VER_MASK)
1725                                 >> SDHCI_SPEC_VER_SHIFT;
1726         if (host->version > SDHCI_SPEC_300) {
1727                 printk(KERN_ERR "%s: Unknown controller version (%d). "
1728                         "You may experience problems.\n", mmc_hostname(mmc),
1729                         host->version);
1730         }
1731
1732         caps = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
1733                 sdhci_readl(host, SDHCI_CAPABILITIES);
1734
1735         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1736                 host->flags |= SDHCI_USE_SDMA;
1737         else if (!(caps & SDHCI_CAN_DO_SDMA))
1738                 DBG("Controller doesn't have SDMA capability\n");
1739         else
1740                 host->flags |= SDHCI_USE_SDMA;
1741
1742         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1743                 (host->flags & SDHCI_USE_SDMA)) {
1744                 DBG("Disabling DMA as it is marked broken\n");
1745                 host->flags &= ~SDHCI_USE_SDMA;
1746         }
1747
1748         if ((host->version >= SDHCI_SPEC_200) && (caps & SDHCI_CAN_DO_ADMA2))
1749                 host->flags |= SDHCI_USE_ADMA;
1750
1751         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
1752                 (host->flags & SDHCI_USE_ADMA)) {
1753                 DBG("Disabling ADMA as it is marked broken\n");
1754                 host->flags &= ~SDHCI_USE_ADMA;
1755         }
1756
1757         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
1758                 if (host->ops->enable_dma) {
1759                         if (host->ops->enable_dma(host)) {
1760                                 printk(KERN_WARNING "%s: No suitable DMA "
1761                                         "available. Falling back to PIO.\n",
1762                                         mmc_hostname(mmc));
1763                                 host->flags &=
1764                                         ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
1765                         }
1766                 }
1767         }
1768
1769         if (host->flags & SDHCI_USE_ADMA) {
1770                 /*
1771                  * We need to allocate descriptors for all sg entries
1772                  * (128) and potentially one alignment transfer for
1773                  * each of those entries.
1774                  */
1775                 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
1776                 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
1777                 if (!host->adma_desc || !host->align_buffer) {
1778                         kfree(host->adma_desc);
1779                         kfree(host->align_buffer);
1780                         printk(KERN_WARNING "%s: Unable to allocate ADMA "
1781                                 "buffers. Falling back to standard DMA.\n",
1782                                 mmc_hostname(mmc));
1783                         host->flags &= ~SDHCI_USE_ADMA;
1784                 }
1785         }
1786
1787         /*
1788          * If we use DMA, then it's up to the caller to set the DMA
1789          * mask, but PIO does not need the hw shim so we set a new
1790          * mask here in that case.
1791          */
1792         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
1793                 host->dma_mask = DMA_BIT_MASK(64);
1794                 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
1795         }
1796
1797         if (host->version >= SDHCI_SPEC_300)
1798                 host->max_clk = (caps & SDHCI_CLOCK_V3_BASE_MASK)
1799                         >> SDHCI_CLOCK_BASE_SHIFT;
1800         else
1801                 host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK)
1802                         >> SDHCI_CLOCK_BASE_SHIFT;
1803
1804         host->max_clk *= 1000000;
1805         if (host->max_clk == 0 || host->quirks &
1806                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
1807                 if (!host->ops->get_max_clock) {
1808                         printk(KERN_ERR
1809                                "%s: Hardware doesn't specify base clock "
1810                                "frequency.\n", mmc_hostname(mmc));
1811                         return -ENODEV;
1812                 }
1813                 host->max_clk = host->ops->get_max_clock(host);
1814         }
1815
1816         host->timeout_clk =
1817                 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1818         if (host->timeout_clk == 0) {
1819                 if (host->ops->get_timeout_clock) {
1820                         host->timeout_clk = host->ops->get_timeout_clock(host);
1821                 } else if (!(host->quirks &
1822                                 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
1823                         printk(KERN_ERR
1824                                "%s: Hardware doesn't specify timeout clock "
1825                                "frequency.\n", mmc_hostname(mmc));
1826                         return -ENODEV;
1827                 }
1828         }
1829         if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1830                 host->timeout_clk *= 1000;
1831
1832         /*
1833          * Set host parameters.
1834          */
1835         mmc->ops = &sdhci_ops;
1836         if (host->ops->get_min_clock)
1837                 mmc->f_min = host->ops->get_min_clock(host);
1838         else if (host->version >= SDHCI_SPEC_300)
1839                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
1840         else
1841                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
1842         mmc->f_max = host->max_clk;
1843         mmc->caps |= MMC_CAP_SDIO_IRQ;
1844
1845         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
1846                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1847
1848         if (caps & SDHCI_CAN_DO_HISPD)
1849                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
1850
1851         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1852                 mmc->caps |= MMC_CAP_NEEDS_POLL;
1853
1854         mmc->ocr_avail = 0;
1855         if (caps & SDHCI_CAN_VDD_330)
1856                 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1857         if (caps & SDHCI_CAN_VDD_300)
1858                 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1859         if (caps & SDHCI_CAN_VDD_180)
1860                 mmc->ocr_avail |= MMC_VDD_165_195;
1861
1862         if (mmc->ocr_avail == 0) {
1863                 printk(KERN_ERR "%s: Hardware doesn't report any "
1864                         "support voltages.\n", mmc_hostname(mmc));
1865                 return -ENODEV;
1866         }
1867
1868         spin_lock_init(&host->lock);
1869
1870         /*
1871          * Maximum number of segments. Depends on if the hardware
1872          * can do scatter/gather or not.
1873          */
1874         if (host->flags & SDHCI_USE_ADMA)
1875                 mmc->max_segs = 128;
1876         else if (host->flags & SDHCI_USE_SDMA)
1877                 mmc->max_segs = 1;
1878         else /* PIO */
1879                 mmc->max_segs = 128;
1880
1881         /*
1882          * Maximum number of sectors in one transfer. Limited by DMA boundary
1883          * size (512KiB).
1884          */
1885         mmc->max_req_size = 524288;
1886
1887         /*
1888          * Maximum segment size. Could be one segment with the maximum number
1889          * of bytes. When doing hardware scatter/gather, each entry cannot
1890          * be larger than 64 KiB though.
1891          */
1892         if (host->flags & SDHCI_USE_ADMA)
1893                 mmc->max_seg_size = 65536;
1894         else
1895                 mmc->max_seg_size = mmc->max_req_size;
1896
1897         /*
1898          * Maximum block size. This varies from controller to controller and
1899          * is specified in the capabilities register.
1900          */
1901         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
1902                 mmc->max_blk_size = 2;
1903         } else {
1904                 mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >>
1905                                 SDHCI_MAX_BLOCK_SHIFT;
1906                 if (mmc->max_blk_size >= 3) {
1907                         printk(KERN_WARNING "%s: Invalid maximum block size, "
1908                                 "assuming 512 bytes\n", mmc_hostname(mmc));
1909                         mmc->max_blk_size = 0;
1910                 }
1911         }
1912
1913         mmc->max_blk_size = 512 << mmc->max_blk_size;
1914
1915         /*
1916          * Maximum block count.
1917          */
1918         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
1919
1920         /*
1921          * Init tasklets.
1922          */
1923         tasklet_init(&host->card_tasklet,
1924                 sdhci_tasklet_card, (unsigned long)host);
1925         tasklet_init(&host->finish_tasklet,
1926                 sdhci_tasklet_finish, (unsigned long)host);
1927
1928         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1929
1930         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1931                 mmc_hostname(mmc), host);
1932         if (ret)
1933                 goto untasklet;
1934
1935         host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
1936         if (IS_ERR(host->vmmc)) {
1937                 printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
1938                 host->vmmc = NULL;
1939         } else {
1940                 regulator_enable(host->vmmc);
1941         }
1942
1943         sdhci_init(host, 0);
1944
1945 #ifdef CONFIG_MMC_DEBUG
1946         sdhci_dumpregs(host);
1947 #endif
1948
1949 #ifdef SDHCI_USE_LEDS_CLASS
1950         snprintf(host->led_name, sizeof(host->led_name),
1951                 "%s::", mmc_hostname(mmc));
1952         host->led.name = host->led_name;
1953         host->led.brightness = LED_OFF;
1954         host->led.default_trigger = mmc_hostname(mmc);
1955         host->led.brightness_set = sdhci_led_control;
1956
1957         ret = led_classdev_register(mmc_dev(mmc), &host->led);
1958         if (ret)
1959                 goto reset;
1960 #endif
1961
1962         mmiowb();
1963
1964         mmc_add_host(mmc);
1965
1966         printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s\n",
1967                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
1968                 (host->flags & SDHCI_USE_ADMA) ? "ADMA" :
1969                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
1970
1971         sdhci_enable_card_detection(host);
1972
1973         return 0;
1974
1975 #ifdef SDHCI_USE_LEDS_CLASS
1976 reset:
1977         sdhci_reset(host, SDHCI_RESET_ALL);
1978         free_irq(host->irq, host);
1979 #endif
1980 untasklet:
1981         tasklet_kill(&host->card_tasklet);
1982         tasklet_kill(&host->finish_tasklet);
1983
1984         return ret;
1985 }
1986
1987 EXPORT_SYMBOL_GPL(sdhci_add_host);
1988
1989 void sdhci_remove_host(struct sdhci_host *host, int dead)
1990 {
1991         unsigned long flags;
1992
1993         if (dead) {
1994                 spin_lock_irqsave(&host->lock, flags);
1995
1996                 host->flags |= SDHCI_DEVICE_DEAD;
1997
1998                 if (host->mrq) {
1999                         printk(KERN_ERR "%s: Controller removed during "
2000                                 " transfer!\n", mmc_hostname(host->mmc));
2001
2002                         host->mrq->cmd->error = -ENOMEDIUM;
2003                         tasklet_schedule(&host->finish_tasklet);
2004                 }
2005
2006                 spin_unlock_irqrestore(&host->lock, flags);
2007         }
2008
2009         sdhci_disable_card_detection(host);
2010
2011         mmc_remove_host(host->mmc);
2012
2013 #ifdef SDHCI_USE_LEDS_CLASS
2014         led_classdev_unregister(&host->led);
2015 #endif
2016
2017         if (!dead)
2018                 sdhci_reset(host, SDHCI_RESET_ALL);
2019
2020         free_irq(host->irq, host);
2021
2022         del_timer_sync(&host->timer);
2023
2024         tasklet_kill(&host->card_tasklet);
2025         tasklet_kill(&host->finish_tasklet);
2026
2027         if (host->vmmc) {
2028                 regulator_disable(host->vmmc);
2029                 regulator_put(host->vmmc);
2030         }
2031
2032         kfree(host->adma_desc);
2033         kfree(host->align_buffer);
2034
2035         host->adma_desc = NULL;
2036         host->align_buffer = NULL;
2037 }
2038
2039 EXPORT_SYMBOL_GPL(sdhci_remove_host);
2040
2041 void sdhci_free_host(struct sdhci_host *host)
2042 {
2043         mmc_free_host(host->mmc);
2044 }
2045
2046 EXPORT_SYMBOL_GPL(sdhci_free_host);
2047
2048 /*****************************************************************************\
2049  *                                                                           *
2050  * Driver init/exit                                                          *
2051  *                                                                           *
2052 \*****************************************************************************/
2053
2054 static int __init sdhci_drv_init(void)
2055 {
2056         printk(KERN_INFO DRIVER_NAME
2057                 ": Secure Digital Host Controller Interface driver\n");
2058         printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2059
2060         return 0;
2061 }
2062
2063 static void __exit sdhci_drv_exit(void)
2064 {
2065 }
2066
2067 module_init(sdhci_drv_init);
2068 module_exit(sdhci_drv_exit);
2069
2070 module_param(debug_quirks, uint, 0444);
2071
2072 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2073 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
2074 MODULE_LICENSE("GPL");
2075
2076 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");