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/module.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/slab.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/pm_runtime.h>
  25
  26 #include <linux/leds.h>
  27
  28 #include <linux/mmc/mmc.h>
  29 #include <linux/mmc/host.h>
  30
  31 #include "sdhci.h"
  32
  33 #define DRIVER_NAME "sdhci"
  34
  35 #define DBG(f, x...) \
  36         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  37
  38 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
  39         defined(CONFIG_MMC_SDHCI_MODULE))
  40 #define SDHCI_USE_LEDS_CLASS
  41 #endif
  42
  43 #define MAX_TUNING_LOOP 40
  44
  45 static unsigned int debug_quirks = 0;
  46 static unsigned int debug_quirks2;
  47
  48 static void sdhci_finish_data(struct sdhci_host *);
  49
  50 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
  51 static void sdhci_finish_command(struct sdhci_host *);
  52 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
  53 static void sdhci_tuning_timer(unsigned long data);
  54
  55 #ifdef CONFIG_PM_RUNTIME
  56 static int sdhci_runtime_pm_get(struct sdhci_host *host);
  57 static int sdhci_runtime_pm_put(struct sdhci_host *host);
  58 #else
  59 static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
  60 {
  61         return 0;
  62 }
  63 static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
  64 {
  65         return 0;
  66 }
  67 #endif
  68
  69 static void sdhci_dumpregs(struct sdhci_host *host)
  70 {
  71         pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
  72                 mmc_hostname(host->mmc));
  73
  74         pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  75                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
  76                 sdhci_readw(host, SDHCI_HOST_VERSION));
  77         pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  78                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
  79                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
  80         pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  81                 sdhci_readl(host, SDHCI_ARGUMENT),
  82                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
  83         pr_debug(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  84                 sdhci_readl(host, SDHCI_PRESENT_STATE),
  85                 sdhci_readb(host, SDHCI_HOST_CONTROL));
  86         pr_debug(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  87                 sdhci_readb(host, SDHCI_POWER_CONTROL),
  88                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
  89         pr_debug(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  90                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
  91                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
  92         pr_debug(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
  93                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
  94                 sdhci_readl(host, SDHCI_INT_STATUS));
  95         pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
  96                 sdhci_readl(host, SDHCI_INT_ENABLE),
  97                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
  98         pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
  99                 sdhci_readw(host, SDHCI_ACMD12_ERR),
 100                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
 101         pr_debug(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
 102                 sdhci_readl(host, SDHCI_CAPABILITIES),
 103                 sdhci_readl(host, SDHCI_CAPABILITIES_1));
 104         pr_debug(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
 105                 sdhci_readw(host, SDHCI_COMMAND),
 106                 sdhci_readl(host, SDHCI_MAX_CURRENT));
 107         pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
 108                 sdhci_readw(host, SDHCI_HOST_CONTROL2));
 109
 110         if (host->flags & SDHCI_USE_ADMA)
 111                 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
 112                        readl(host->ioaddr + SDHCI_ADMA_ERROR),
 113                        readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
 114
 115         pr_debug(DRIVER_NAME ": ===========================================\n");
 116 }
 117
 118 /*****************************************************************************\
 119  *                                                                           *
 120  * Low level functions                                                       *
 121  *                                                                           *
 122 \*****************************************************************************/
 123
 124 static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
 125 {
 126         u32 ier;
 127
 128         ier = sdhci_readl(host, SDHCI_INT_ENABLE);
 129         ier &= ~clear;
 130         ier |= set;
 131         sdhci_writel(host, ier, SDHCI_INT_ENABLE);
 132         sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
 133 }
 134
 135 static void sdhci_unmask_irqs(struct sdhci_host *host, u32 irqs)
 136 {
 137         sdhci_clear_set_irqs(host, 0, irqs);
 138 }
 139
 140 static void sdhci_mask_irqs(struct sdhci_host *host, u32 irqs)
 141 {
 142         sdhci_clear_set_irqs(host, irqs, 0);
 143 }
 144
 145 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
 146 {
 147         u32 present, irqs;
 148
 149         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
 150             !mmc_card_is_removable(host->mmc))
 151                 return;
 152
 153         present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
 154                               SDHCI_CARD_PRESENT;
 155         irqs = present ? SDHCI_INT_CARD_REMOVE : SDHCI_INT_CARD_INSERT;
 156
 157         if (enable)
 158                 sdhci_unmask_irqs(host, irqs);
 159         else
 160                 sdhci_mask_irqs(host, irqs);
 161 }
 162
 163 static void sdhci_enable_card_detection(struct sdhci_host *host)
 164 {
 165         sdhci_set_card_detection(host, true);
 166 }
 167
 168 static void sdhci_disable_card_detection(struct sdhci_host *host)
 169 {
 170         sdhci_set_card_detection(host, false);
 171 }
 172
 173 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 174 {
 175         unsigned long timeout;
 176         u32 uninitialized_var(ier);
 177
 178         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 179                 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
 180                         SDHCI_CARD_PRESENT))
 181                         return;
 182         }
 183
 184         if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
 185                 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
 186
 187         if (host->ops->platform_reset_enter)
 188                 host->ops->platform_reset_enter(host, mask);
 189
 190         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 191
 192         if (mask & SDHCI_RESET_ALL)
 193                 host->clock = 0;
 194
 195         /* Wait max 100 ms */
 196         timeout = 100;
 197
 198         /* hw clears the bit when it's done */
 199         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
 200                 if (timeout == 0) {
 201                         pr_err("%s: Reset 0x%x never completed.\n",
 202                                 mmc_hostname(host->mmc), (int)mask);
 203                         sdhci_dumpregs(host);
 204                         return;
 205                 }
 206                 timeout--;
 207                 mdelay(1);
 208         }
 209
 210         if (host->ops->platform_reset_exit)
 211                 host->ops->platform_reset_exit(host, mask);
 212
 213         if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
 214                 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
 215
 216         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 217                 if ((host->ops->enable_dma) && (mask & SDHCI_RESET_ALL))
 218                         host->ops->enable_dma(host);
 219         }
 220 }
 221
 222 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
 223
 224 static void sdhci_init(struct sdhci_host *host, int soft)
 225 {
 226         if (soft)
 227                 sdhci_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
 228         else
 229                 sdhci_reset(host, SDHCI_RESET_ALL);
 230
 231         sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
 232                 SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 233                 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
 234                 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
 235                 SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE);
 236
 237         if (soft) {
 238                 /* force clock reconfiguration */
 239                 host->clock = 0;
 240                 sdhci_set_ios(host->mmc, &host->mmc->ios);
 241         }
 242 }
 243
 244 static void sdhci_reinit(struct sdhci_host *host)
 245 {
 246         sdhci_init(host, 0);
 247         sdhci_enable_card_detection(host);
 248 }
 249
 250 static void sdhci_activate_led(struct sdhci_host *host)
 251 {
 252         u8 ctrl;
 253
 254         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 255         ctrl |= SDHCI_CTRL_LED;
 256         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 257 }
 258
 259 static void sdhci_deactivate_led(struct sdhci_host *host)
 260 {
 261         u8 ctrl;
 262
 263         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 264         ctrl &= ~SDHCI_CTRL_LED;
 265         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 266 }
 267
 268 #ifdef SDHCI_USE_LEDS_CLASS
 269 static void sdhci_led_control(struct led_classdev *led,
 270         enum led_brightness brightness)
 271 {
 272         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 273         unsigned long flags;
 274
 275         spin_lock_irqsave(&host->lock, flags);
 276
 277         if (host->runtime_suspended)
 278                 goto out;
 279
 280         if (brightness == LED_OFF)
 281                 sdhci_deactivate_led(host);
 282         else
 283                 sdhci_activate_led(host);
 284 out:
 285         spin_unlock_irqrestore(&host->lock, flags);
 286 }
 287 #endif
 288
 289 /*****************************************************************************\
 290  *                                                                           *
 291  * Core functions                                                            *
 292  *                                                                           *
 293 \*****************************************************************************/
 294
 295 static void sdhci_read_block_pio(struct sdhci_host *host)
 296 {
 297         unsigned long flags;
 298         size_t blksize, len, chunk;
 299         u32 uninitialized_var(scratch);
 300         u8 *buf;
 301
 302         DBG("PIO reading\n");
 303
 304         blksize = host->data->blksz;
 305         chunk = 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                         if (chunk == 0) {
 322                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
 323                                 chunk = 4;
 324                         }
 325
 326                         *buf = scratch & 0xFF;
 327
 328                         buf++;
 329                         scratch >>= 8;
 330                         chunk--;
 331                         len--;
 332                 }
 333         }
 334
 335         sg_miter_stop(&host->sg_miter);
 336
 337         local_irq_restore(flags);
 338 }
 339
 340 static void sdhci_write_block_pio(struct sdhci_host *host)
 341 {
 342         unsigned long flags;
 343         size_t blksize, len, chunk;
 344         u32 scratch;
 345         u8 *buf;
 346
 347         DBG("PIO writing\n");
 348
 349         blksize = host->data->blksz;
 350         chunk = 0;
 351         scratch = 0;
 352
 353         local_irq_save(flags);
 354
 355         while (blksize) {
 356                 if (!sg_miter_next(&host->sg_miter))
 357                         BUG();
 358
 359                 len = min(host->sg_miter.length, blksize);
 360
 361                 blksize -= len;
 362                 host->sg_miter.consumed = len;
 363
 364                 buf = host->sg_miter.addr;
 365
 366                 while (len) {
 367                         scratch |= (u32)*buf << (chunk * 8);
 368
 369                         buf++;
 370                         chunk++;
 371                         len--;
 372
 373                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 374                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
 375                                 chunk = 0;
 376                                 scratch = 0;
 377                         }
 378                 }
 379         }
 380
 381         sg_miter_stop(&host->sg_miter);
 382
 383         local_irq_restore(flags);
 384 }
 385
 386 static void sdhci_transfer_pio(struct sdhci_host *host)
 387 {
 388         u32 mask;
 389
 390         BUG_ON(!host->data);
 391
 392         if (host->blocks == 0)
 393                 return;
 394
 395         if (host->data->flags & MMC_DATA_READ)
 396                 mask = SDHCI_DATA_AVAILABLE;
 397         else
 398                 mask = SDHCI_SPACE_AVAILABLE;
 399
 400         /*
 401          * Some controllers (JMicron JMB38x) mess up the buffer bits
 402          * for transfers < 4 bytes. As long as it is just one block,
 403          * we can ignore the bits.
 404          */
 405         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
 406                 (host->data->blocks == 1))
 407                 mask = ~0;
 408
 409         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 410                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 411                         udelay(100);
 412
 413                 if (host->data->flags & MMC_DATA_READ)
 414                         sdhci_read_block_pio(host);
 415                 else
 416                         sdhci_write_block_pio(host);
 417
 418                 host->blocks--;
 419                 if (host->blocks == 0)
 420                         break;
 421         }
 422
 423         DBG("PIO transfer complete.\n");
 424 }
 425
 426 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 427 {
 428         local_irq_save(*flags);
 429         return kmap_atomic(sg_page(sg)) + sg->offset;
 430 }
 431
 432 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 433 {
 434         kunmap_atomic(buffer);
 435         local_irq_restore(*flags);
 436 }
 437
 438 static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
 439 {
 440         __le32 *dataddr = (__le32 __force *)(desc + 4);
 441         __le16 *cmdlen = (__le16 __force *)desc;
 442
 443         /* SDHCI specification says ADMA descriptors should be 4 byte
 444          * aligned, so using 16 or 32bit operations should be safe. */
 445
 446         cmdlen[0] = cpu_to_le16(cmd);
 447         cmdlen[1] = cpu_to_le16(len);
 448
 449         dataddr[0] = cpu_to_le32(addr);
 450 }
 451
 452 static int sdhci_adma_table_pre(struct sdhci_host *host,
 453         struct mmc_data *data)
 454 {
 455         int direction;
 456
 457         u8 *desc;
 458         u8 *align;
 459         dma_addr_t addr;
 460         dma_addr_t align_addr;
 461         int len, offset;
 462
 463         struct scatterlist *sg;
 464         int i;
 465         char *buffer;
 466         unsigned long flags;
 467
 468         /*
 469          * The spec does not specify endianness of descriptor table.
 470          * We currently guess that it is LE.
 471          */
 472
 473         if (data->flags & MMC_DATA_READ)
 474                 direction = DMA_FROM_DEVICE;
 475         else
 476                 direction = DMA_TO_DEVICE;
 477
 478         /*
 479          * The ADMA descriptor table is mapped further down as we
 480          * need to fill it with data first.
 481          */
 482
 483         host->align_addr = dma_map_single(mmc_dev(host->mmc),
 484                 host->align_buffer, 128 * 4, direction);
 485         if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
 486                 goto fail;
 487         BUG_ON(host->align_addr & 0x3);
 488
 489         host->sg_count = dma_map_sg(mmc_dev(host->mmc),
 490                 data->sg, data->sg_len, direction);
 491         if (host->sg_count == 0)
 492                 goto unmap_align;
 493
 494         desc = host->adma_desc;
 495         align = host->align_buffer;
 496
 497         align_addr = host->align_addr;
 498
 499         for_each_sg(data->sg, sg, host->sg_count, i) {
 500                 addr = sg_dma_address(sg);
 501                 len = sg_dma_len(sg);
 502
 503                 /*
 504                  * The SDHCI specification states that ADMA
 505                  * addresses must be 32-bit aligned. If they
 506                  * aren't, then we use a bounce buffer for
 507                  * the (up to three) bytes that screw up the
 508                  * alignment.
 509                  */
 510                 offset = (4 - (addr & 0x3)) & 0x3;
 511                 if (offset) {
 512                         if (data->flags & MMC_DATA_WRITE) {
 513                                 buffer = sdhci_kmap_atomic(sg, &flags);
 514                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 515                                 memcpy(align, buffer, offset);
 516                                 sdhci_kunmap_atomic(buffer, &flags);
 517                         }
 518
 519                         /* tran, valid */
 520                         sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
 521
 522                         BUG_ON(offset > 65536);
 523
 524                         align += 4;
 525                         align_addr += 4;
 526
 527                         desc += 8;
 528
 529                         addr += offset;
 530                         len -= offset;
 531                 }
 532
 533                 BUG_ON(len > 65536);
 534
 535                 /* tran, valid */
 536                 sdhci_set_adma_desc(desc, addr, len, 0x21);
 537                 desc += 8;
 538
 539                 /*
 540                  * If this triggers then we have a calculation bug
 541                  * somewhere. :/
 542                  */
 543                 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
 544         }
 545
 546         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
 547                 /*
 548                 * Mark the last descriptor as the terminating descriptor
 549                 */
 550                 if (desc != host->adma_desc) {
 551                         desc -= 8;
 552                         desc[0] |= 0x2; /* end */
 553                 }
 554         } else {
 555                 /*
 556                 * Add a terminating entry.
 557                 */
 558
 559                 /* nop, end, valid */
 560                 sdhci_set_adma_desc(desc, 0, 0, 0x3);
 561         }
 562
 563         /*
 564          * Resync align buffer as we might have changed it.
 565          */
 566         if (data->flags & MMC_DATA_WRITE) {
 567                 dma_sync_single_for_device(mmc_dev(host->mmc),
 568                         host->align_addr, 128 * 4, direction);
 569         }
 570
 571         host->adma_addr = dma_map_single(mmc_dev(host->mmc),
 572                 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
 573         if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr))
 574                 goto unmap_entries;
 575         BUG_ON(host->adma_addr & 0x3);
 576
 577         return 0;
 578
 579 unmap_entries:
 580         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 581                 data->sg_len, direction);
 582 unmap_align:
 583         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 584                 128 * 4, direction);
 585 fail:
 586         return -EINVAL;
 587 }
 588
 589 static void sdhci_adma_table_post(struct sdhci_host *host,
 590         struct mmc_data *data)
 591 {
 592         int direction;
 593
 594         struct scatterlist *sg;
 595         int i, size;
 596         u8 *align;
 597         char *buffer;
 598         unsigned long flags;
 599
 600         if (data->flags & MMC_DATA_READ)
 601                 direction = DMA_FROM_DEVICE;
 602         else
 603                 direction = DMA_TO_DEVICE;
 604
 605         dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
 606                 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
 607
 608         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 609                 128 * 4, direction);
 610
 611         if (data->flags & MMC_DATA_READ) {
 612                 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 613                         data->sg_len, direction);
 614
 615                 align = host->align_buffer;
 616
 617                 for_each_sg(data->sg, sg, host->sg_count, i) {
 618                         if (sg_dma_address(sg) & 0x3) {
 619                                 size = 4 - (sg_dma_address(sg) & 0x3);
 620
 621                                 buffer = sdhci_kmap_atomic(sg, &flags);
 622                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 623                                 memcpy(buffer, align, size);
 624                                 sdhci_kunmap_atomic(buffer, &flags);
 625
 626                                 align += 4;
 627                         }
 628                 }
 629         }
 630
 631         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 632                 data->sg_len, direction);
 633 }
 634
 635 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 636 {
 637         u8 count;
 638         struct mmc_data *data = cmd->data;
 639         unsigned target_timeout, current_timeout;
 640
 641         /*
 642          * If the host controller provides us with an incorrect timeout
 643          * value, just skip the check and use 0xE.  The hardware may take
 644          * longer to time out, but that's much better than having a too-short
 645          * timeout value.
 646          */
 647         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
 648                 return 0xE;
 649
 650         /* Unspecified timeout, assume max */
 651         if (!data && !cmd->cmd_timeout_ms)
 652                 return 0xE;
 653
 654         /* timeout in us */
 655         if (!data)
 656                 target_timeout = cmd->cmd_timeout_ms * 1000;
 657         else {
 658                 target_timeout = data->timeout_ns / 1000;
 659                 if (host->clock)
 660                         target_timeout += data->timeout_clks / host->clock;
 661         }
 662
 663         /*
 664          * Figure out needed cycles.
 665          * We do this in steps in order to fit inside a 32 bit int.
 666          * The first step is the minimum timeout, which will have a
 667          * minimum resolution of 6 bits:
 668          * (1) 2^13*1000 > 2^22,
 669          * (2) host->timeout_clk < 2^16
 670          *     =>
 671          *     (1) / (2) > 2^6
 672          */
 673         count = 0;
 674         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 675         while (current_timeout < target_timeout) {
 676                 count++;
 677                 current_timeout <<= 1;
 678                 if (count >= 0xF)
 679                         break;
 680         }
 681
 682         if (count >= 0xF) {
 683                 pr_warning("%s: Too large timeout requested for CMD%d!\n",
 684                        mmc_hostname(host->mmc), cmd->opcode);
 685                 count = 0xE;
 686         }
 687
 688         return count;
 689 }
 690
 691 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 692 {
 693         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 694         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 695
 696         if (host->flags & SDHCI_REQ_USE_DMA)
 697                 sdhci_clear_set_irqs(host, pio_irqs, dma_irqs);
 698         else
 699                 sdhci_clear_set_irqs(host, dma_irqs, pio_irqs);
 700 }
 701
 702 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 703 {
 704         u8 count;
 705         u8 ctrl;
 706         struct mmc_data *data = cmd->data;
 707         int ret;
 708
 709         WARN_ON(host->data);
 710
 711         if (data || (cmd->flags & MMC_RSP_BUSY)) {
 712                 count = sdhci_calc_timeout(host, cmd);
 713                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
 714         }
 715
 716         if (!data)
 717                 return;
 718
 719         /* Sanity checks */
 720         BUG_ON(data->blksz * data->blocks > 524288);
 721         BUG_ON(data->blksz > host->mmc->max_blk_size);
 722         BUG_ON(data->blocks > 65535);
 723
 724         host->data = data;
 725         host->data_early = 0;
 726         host->data->bytes_xfered = 0;
 727
 728         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
 729                 host->flags |= SDHCI_REQ_USE_DMA;
 730
 731         /*
 732          * FIXME: This doesn't account for merging when mapping the
 733          * scatterlist.
 734          */
 735         if (host->flags & SDHCI_REQ_USE_DMA) {
 736                 int broken, i;
 737                 struct scatterlist *sg;
 738
 739                 broken = 0;
 740                 if (host->flags & SDHCI_USE_ADMA) {
 741                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 742                                 broken = 1;
 743                 } else {
 744                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
 745                                 broken = 1;
 746                 }
 747
 748                 if (unlikely(broken)) {
 749                         for_each_sg(data->sg, sg, data->sg_len, i) {
 750                                 if (sg->length & 0x3) {
 751                                         DBG("Reverting to PIO because of "
 752                                                 "transfer size (%d)\n",
 753                                                 sg->length);
 754                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 755                                         break;
 756                                 }
 757                         }
 758                 }
 759         }
 760
 761         /*
 762          * The assumption here being that alignment is the same after
 763          * translation to device address space.
 764          */
 765         if (host->flags & SDHCI_REQ_USE_DMA) {
 766                 int broken, i;
 767                 struct scatterlist *sg;
 768
 769                 broken = 0;
 770                 if (host->flags & SDHCI_USE_ADMA) {
 771                         /*
 772                          * As we use 3 byte chunks to work around
 773                          * alignment problems, we need to check this
 774                          * quirk.
 775                          */
 776                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 777                                 broken = 1;
 778                 } else {
 779                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
 780                                 broken = 1;
 781                 }
 782
 783                 if (unlikely(broken)) {
 784                         for_each_sg(data->sg, sg, data->sg_len, i) {
 785                                 if (sg->offset & 0x3) {
 786                                         DBG("Reverting to PIO because of "
 787                                                 "bad alignment\n");
 788                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 789                                         break;
 790                                 }
 791                         }
 792                 }
 793         }
 794
 795         if (host->flags & SDHCI_REQ_USE_DMA) {
 796                 if (host->flags & SDHCI_USE_ADMA) {
 797                         ret = sdhci_adma_table_pre(host, data);
 798                         if (ret) {
 799                                 /*
 800                                  * This only happens when someone fed
 801                                  * us an invalid request.
 802                                  */
 803                                 WARN_ON(1);
 804                                 host->flags &= ~SDHCI_REQ_USE_DMA;
 805                         } else {
 806                                 sdhci_writel(host, host->adma_addr,
 807                                         SDHCI_ADMA_ADDRESS);
 808                         }
 809                 } else {
 810                         int sg_cnt;
 811
 812                         sg_cnt = dma_map_sg(mmc_dev(host->mmc),
 813                                         data->sg, data->sg_len,
 814                                         (data->flags & MMC_DATA_READ) ?
 815                                                 DMA_FROM_DEVICE :
 816                                                 DMA_TO_DEVICE);
 817                         if (sg_cnt == 0) {
 818                                 /*
 819                                  * This only happens when someone fed
 820                                  * us an invalid request.
 821                                  */
 822                                 WARN_ON(1);
 823                                 host->flags &= ~SDHCI_REQ_USE_DMA;
 824                         } else {
 825                                 WARN_ON(sg_cnt != 1);
 826                                 sdhci_writel(host, sg_dma_address(data->sg),
 827                                         SDHCI_DMA_ADDRESS);
 828                         }
 829                 }
 830         }
 831
 832         /*
 833          * Always adjust the DMA selection as some controllers
 834          * (e.g. JMicron) can't do PIO properly when the selection
 835          * is ADMA.
 836          */
 837         if (host->version >= SDHCI_SPEC_200) {
 838                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 839                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
 840                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
 841                         (host->flags & SDHCI_USE_ADMA))
 842                         ctrl |= SDHCI_CTRL_ADMA32;
 843                 else
 844                         ctrl |= SDHCI_CTRL_SDMA;
 845                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 846         }
 847
 848         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
 849                 int flags;
 850
 851                 flags = SG_MITER_ATOMIC;
 852                 if (host->data->flags & MMC_DATA_READ)
 853                         flags |= SG_MITER_TO_SG;
 854                 else
 855                         flags |= SG_MITER_FROM_SG;
 856                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
 857                 host->blocks = data->blocks;
 858         }
 859
 860         sdhci_set_transfer_irqs(host);
 861
 862         /* Set the DMA boundary value and block size */
 863         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 864                 data->blksz), SDHCI_BLOCK_SIZE);
 865         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 866 }
 867
 868 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 869         struct mmc_command *cmd)
 870 {
 871         u16 mode;
 872         struct mmc_data *data = cmd->data;
 873
 874         if (data == NULL)
 875                 return;
 876
 877         WARN_ON(!host->data);
 878
 879         mode = SDHCI_TRNS_BLK_CNT_EN;
 880         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
 881                 mode |= SDHCI_TRNS_MULTI;
 882                 /*
 883                  * If we are sending CMD23, CMD12 never gets sent
 884                  * on successful completion (so no Auto-CMD12).
 885                  */
 886                 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
 887                         mode |= SDHCI_TRNS_AUTO_CMD12;
 888                 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
 889                         mode |= SDHCI_TRNS_AUTO_CMD23;
 890                         sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
 891                 }
 892         }
 893
 894         if (data->flags & MMC_DATA_READ)
 895                 mode |= SDHCI_TRNS_READ;
 896         if (host->flags & SDHCI_REQ_USE_DMA)
 897                 mode |= SDHCI_TRNS_DMA;
 898
 899         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 900 }
 901
 902 static void sdhci_finish_data(struct sdhci_host *host)
 903 {
 904         struct mmc_data *data;
 905
 906         BUG_ON(!host->data);
 907
 908         data = host->data;
 909         host->data = NULL;
 910
 911         if (host->flags & SDHCI_REQ_USE_DMA) {
 912                 if (host->flags & SDHCI_USE_ADMA)
 913                         sdhci_adma_table_post(host, data);
 914                 else {
 915                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 916                                 data->sg_len, (data->flags & MMC_DATA_READ) ?
 917                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
 918                 }
 919         }
 920
 921         /*
 922          * The specification states that the block count register must
 923          * be updated, but it does not specify at what point in the
 924          * data flow. That makes the register entirely useless to read
 925          * back so we have to assume that nothing made it to the card
 926          * in the event of an error.
 927          */
 928         if (data->error)
 929                 data->bytes_xfered = 0;
 930         else
 931                 data->bytes_xfered = data->blksz * data->blocks;
 932
 933         /*
 934          * Need to send CMD12 if -
 935          * a) open-ended multiblock transfer (no CMD23)
 936          * b) error in multiblock transfer
 937          */
 938         if (data->stop &&
 939             (data->error ||
 940              !host->mrq->sbc)) {
 941
 942                 /*
 943                  * The controller needs a reset of internal state machines
 944                  * upon error conditions.
 945                  */
 946                 if (data->error) {
 947                         sdhci_reset(host, SDHCI_RESET_CMD);
 948                         sdhci_reset(host, SDHCI_RESET_DATA);
 949                 }
 950
 951                 sdhci_send_command(host, data->stop);
 952         } else
 953                 tasklet_schedule(&host->finish_tasklet);
 954 }
 955
 956 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 957 {
 958         int flags;
 959         u32 mask;
 960         unsigned long timeout;
 961
 962         WARN_ON(host->cmd);
 963
 964         /* Wait max 10 ms */
 965         timeout = 10;
 966
 967         mask = SDHCI_CMD_INHIBIT;
 968         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 969                 mask |= SDHCI_DATA_INHIBIT;
 970
 971         /* We shouldn't wait for data inihibit for stop commands, even
 972            though they might use busy signaling */
 973         if (host->mrq->data && (cmd == host->mrq->data->stop))
 974                 mask &= ~SDHCI_DATA_INHIBIT;
 975
 976         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 977                 if (timeout == 0) {
 978                         pr_err("%s: Controller never released "
 979                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 980                         sdhci_dumpregs(host);
 981                         cmd->error = -EIO;
 982                         tasklet_schedule(&host->finish_tasklet);
 983                         return;
 984                 }
 985                 timeout--;
 986                 mdelay(1);
 987         }
 988
 989         mod_timer(&host->timer, jiffies + 10 * HZ);
 990
 991         host->cmd = cmd;
 992
 993         sdhci_prepare_data(host, cmd);
 994
 995         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
 996
 997         sdhci_set_transfer_mode(host, cmd);
 998
 999         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1000                 pr_err("%s: Unsupported response type!\n",
1001                         mmc_hostname(host->mmc));
1002                 cmd->error = -EINVAL;
1003                 tasklet_schedule(&host->finish_tasklet);
1004                 return;
1005         }
1006
1007         if (!(cmd->flags & MMC_RSP_PRESENT))
1008                 flags = SDHCI_CMD_RESP_NONE;
1009         else if (cmd->flags & MMC_RSP_136)
1010                 flags = SDHCI_CMD_RESP_LONG;
1011         else if (cmd->flags & MMC_RSP_BUSY)
1012                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1013         else
1014                 flags = SDHCI_CMD_RESP_SHORT;
1015
1016         if (cmd->flags & MMC_RSP_CRC)
1017                 flags |= SDHCI_CMD_CRC;
1018         if (cmd->flags & MMC_RSP_OPCODE)
1019                 flags |= SDHCI_CMD_INDEX;
1020
1021         /* CMD19 is special in that the Data Present Select should be set */
1022         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1023             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1024                 flags |= SDHCI_CMD_DATA;
1025
1026         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1027 }
1028
1029 static void sdhci_finish_command(struct sdhci_host *host)
1030 {
1031         int i;
1032
1033         BUG_ON(host->cmd == NULL);
1034
1035         if (host->cmd->flags & MMC_RSP_PRESENT) {
1036                 if (host->cmd->flags & MMC_RSP_136) {
1037                         /* CRC is stripped so we need to do some shifting. */
1038                         for (i = 0;i < 4;i++) {
1039                                 host->cmd->resp[i] = sdhci_readl(host,
1040                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1041                                 if (i != 3)
1042                                         host->cmd->resp[i] |=
1043                                                 sdhci_readb(host,
1044                                                 SDHCI_RESPONSE + (3-i)*4-1);
1045                         }
1046                 } else {
1047                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1048                 }
1049         }
1050
1051         host->cmd->error = 0;
1052
1053         /* Finished CMD23, now send actual command. */
1054         if (host->cmd == host->mrq->sbc) {
1055                 host->cmd = NULL;
1056                 sdhci_send_command(host, host->mrq->cmd);
1057         } else {
1058
1059                 /* Processed actual command. */
1060                 if (host->data && host->data_early)
1061                         sdhci_finish_data(host);
1062
1063                 if (!host->cmd->data)
1064                         tasklet_schedule(&host->finish_tasklet);
1065
1066                 host->cmd = NULL;
1067         }
1068 }
1069
1070 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1071 {
1072         int div = 0; /* Initialized for compiler warning */
1073         int real_div = div, clk_mul = 1;
1074         u16 clk = 0;
1075         unsigned long timeout;
1076
1077         if (clock && clock == host->clock)
1078                 return;
1079
1080         host->mmc->actual_clock = 0;
1081
1082         if (host->ops->set_clock) {
1083                 host->ops->set_clock(host, clock);
1084                 if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK)
1085                         return;
1086         }
1087
1088         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1089
1090         if (clock == 0)
1091                 goto out;
1092
1093         if (host->version >= SDHCI_SPEC_300) {
1094                 /*
1095                  * Check if the Host Controller supports Programmable Clock
1096                  * Mode.
1097                  */
1098                 if (host->clk_mul) {
1099                         u16 ctrl;
1100
1101                         /*
1102                          * We need to figure out whether the Host Driver needs
1103                          * to select Programmable Clock Mode, or the value can
1104                          * be set automatically by the Host Controller based on
1105                          * the Preset Value registers.
1106                          */
1107                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1108                         if (!(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1109                                 for (div = 1; div <= 1024; div++) {
1110                                         if (((host->max_clk * host->clk_mul) /
1111                                               div) <= clock)
1112                                                 break;
1113                                 }
1114                                 /*
1115                                  * Set Programmable Clock Mode in the Clock
1116                                  * Control register.
1117                                  */
1118                                 clk = SDHCI_PROG_CLOCK_MODE;
1119                                 real_div = div;
1120                                 clk_mul = host->clk_mul;
1121                                 div--;
1122                         }
1123                 } else {
1124                         /* Version 3.00 divisors must be a multiple of 2. */
1125                         if (host->max_clk <= clock)
1126                                 div = 1;
1127                         else {
1128                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1129                                      div += 2) {
1130                                         if ((host->max_clk / div) <= clock)
1131                                                 break;
1132                                 }
1133                         }
1134                         real_div = div;
1135                         div >>= 1;
1136                 }
1137         } else {
1138                 /* Version 2.00 divisors must be a power of 2. */
1139                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1140                         if ((host->max_clk / div) <= clock)
1141                                 break;
1142                 }
1143                 real_div = div;
1144                 div >>= 1;
1145         }
1146
1147         if (real_div)
1148                 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1149
1150         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1151         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1152                 << SDHCI_DIVIDER_HI_SHIFT;
1153         clk |= SDHCI_CLOCK_INT_EN;
1154         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1155
1156         /* Wait max 20 ms */
1157         timeout = 20;
1158         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1159                 & SDHCI_CLOCK_INT_STABLE)) {
1160                 if (timeout == 0) {
1161                         pr_err("%s: Internal clock never "
1162                                 "stabilised.\n", mmc_hostname(host->mmc));
1163                         sdhci_dumpregs(host);
1164                         return;
1165                 }
1166                 timeout--;
1167                 mdelay(1);
1168         }
1169
1170         clk |= SDHCI_CLOCK_CARD_EN;
1171         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1172
1173 out:
1174         host->clock = clock;
1175 }
1176
1177 static int sdhci_set_power(struct sdhci_host *host, unsigned short power)
1178 {
1179         u8 pwr = 0;
1180
1181         if (power != (unsigned short)-1) {
1182                 switch (1 << power) {
1183                 case MMC_VDD_165_195:
1184                         pwr = SDHCI_POWER_180;
1185                         break;
1186                 case MMC_VDD_29_30:
1187                 case MMC_VDD_30_31:
1188                         pwr = SDHCI_POWER_300;
1189                         break;
1190                 case MMC_VDD_32_33:
1191                 case MMC_VDD_33_34:
1192                         pwr = SDHCI_POWER_330;
1193                         break;
1194                 default:
1195                         BUG();
1196                 }
1197         }
1198
1199         if (host->pwr == pwr)
1200                 return -1;
1201
1202         host->pwr = pwr;
1203
1204         if (pwr == 0) {
1205                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1206                 return 0;
1207         }
1208
1209         /*
1210          * Spec says that we should clear the power reg before setting
1211          * a new value. Some controllers don't seem to like this though.
1212          */
1213         if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1214                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1215
1216         /*
1217          * At least the Marvell CaFe chip gets confused if we set the voltage
1218          * and set turn on power at the same time, so set the voltage first.
1219          */
1220         if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1221                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1222
1223         pwr |= SDHCI_POWER_ON;
1224
1225         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1226
1227         /*
1228          * Some controllers need an extra 10ms delay of 10ms before they
1229          * can apply clock after applying power
1230          */
1231         if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1232                 mdelay(10);
1233
1234         return power;
1235 }
1236
1237 /*****************************************************************************\
1238  *                                                                           *
1239  * MMC callbacks                                                             *
1240  *                                                                           *
1241 \*****************************************************************************/
1242
1243 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1244 {
1245         struct sdhci_host *host;
1246         bool present;
1247         unsigned long flags;
1248
1249         host = mmc_priv(mmc);
1250
1251         sdhci_runtime_pm_get(host);
1252
1253         spin_lock_irqsave(&host->lock, flags);
1254
1255         WARN_ON(host->mrq != NULL);
1256
1257 #ifndef SDHCI_USE_LEDS_CLASS
1258         sdhci_activate_led(host);
1259 #endif
1260
1261         /*
1262          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1263          * requests if Auto-CMD12 is enabled.
1264          */
1265         if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1266                 if (mrq->stop) {
1267                         mrq->data->stop = NULL;
1268                         mrq->stop = NULL;
1269                 }
1270         }
1271
1272         host->mrq = mrq;
1273
1274         /* If polling, assume that the card is always present. */
1275         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1276                 present = true;
1277         else
1278                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1279                                 SDHCI_CARD_PRESENT;
1280
1281         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1282                 host->mrq->cmd->error = -ENOMEDIUM;
1283                 tasklet_schedule(&host->finish_tasklet);
1284         } else {
1285                 u32 present_state;
1286
1287                 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1288                 /*
1289                  * Check if the re-tuning timer has already expired and there
1290                  * is no on-going data transfer. If so, we need to execute
1291                  * tuning procedure before sending command.
1292                  */
1293                 if ((host->flags & SDHCI_NEEDS_RETUNING) &&
1294                     !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
1295                         spin_unlock_irqrestore(&host->lock, flags);
1296                         sdhci_execute_tuning(mmc, mrq->cmd->opcode);
1297                         spin_lock_irqsave(&host->lock, flags);
1298
1299                         /* Restore original mmc_request structure */
1300                         host->mrq = mrq;
1301                 }
1302
1303                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1304                         sdhci_send_command(host, mrq->sbc);
1305                 else
1306                         sdhci_send_command(host, mrq->cmd);
1307         }
1308
1309         mmiowb();
1310         spin_unlock_irqrestore(&host->lock, flags);
1311 }
1312
1313 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1314 {
1315         unsigned long flags;
1316         int vdd_bit = -1;
1317         u8 ctrl;
1318
1319         spin_lock_irqsave(&host->lock, flags);
1320
1321         if (host->flags & SDHCI_DEVICE_DEAD) {
1322                 spin_unlock_irqrestore(&host->lock, flags);
1323                 if (host->vmmc && ios->power_mode == MMC_POWER_OFF)
1324                         mmc_regulator_set_ocr(host->mmc, host->vmmc, 0);
1325                 return;
1326         }
1327
1328         /*
1329          * Reset the chip on each power off.
1330          * Should clear out any weird states.
1331          */
1332         if (ios->power_mode == MMC_POWER_OFF) {
1333                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1334                 sdhci_reinit(host);
1335         }
1336
1337         sdhci_set_clock(host, ios->clock);
1338
1339         if (ios->power_mode == MMC_POWER_OFF)
1340                 vdd_bit = sdhci_set_power(host, -1);
1341         else
1342                 vdd_bit = sdhci_set_power(host, ios->vdd);
1343
1344         if (host->vmmc && vdd_bit != -1) {
1345                 spin_unlock_irqrestore(&host->lock, flags);
1346                 mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd_bit);
1347                 spin_lock_irqsave(&host->lock, flags);
1348         }
1349
1350         if (host->ops->platform_send_init_74_clocks)
1351                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1352
1353         /*
1354          * If your platform has 8-bit width support but is not a v3 controller,
1355          * or if it requires special setup code, you should implement that in
1356          * platform_8bit_width().
1357          */
1358         if (host->ops->platform_8bit_width)
1359                 host->ops->platform_8bit_width(host, ios->bus_width);
1360         else {
1361                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1362                 if (ios->bus_width == MMC_BUS_WIDTH_8) {
1363                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1364                         if (host->version >= SDHCI_SPEC_300)
1365                                 ctrl |= SDHCI_CTRL_8BITBUS;
1366                 } else {
1367                         if (host->version >= SDHCI_SPEC_300)
1368                                 ctrl &= ~SDHCI_CTRL_8BITBUS;
1369                         if (ios->bus_width == MMC_BUS_WIDTH_4)
1370                                 ctrl |= SDHCI_CTRL_4BITBUS;
1371                         else
1372                                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1373                 }
1374                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1375         }
1376
1377         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1378
1379         if ((ios->timing == MMC_TIMING_SD_HS ||
1380              ios->timing == MMC_TIMING_MMC_HS)
1381             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1382                 ctrl |= SDHCI_CTRL_HISPD;
1383         else
1384                 ctrl &= ~SDHCI_CTRL_HISPD;
1385
1386         if (host->version >= SDHCI_SPEC_300) {
1387                 u16 clk, ctrl_2;
1388                 unsigned int clock;
1389
1390                 /* In case of UHS-I modes, set High Speed Enable */
1391                 if ((ios->timing == MMC_TIMING_MMC_HS200) ||
1392                     (ios->timing == MMC_TIMING_UHS_SDR50) ||
1393                     (ios->timing == MMC_TIMING_UHS_SDR104) ||
1394                     (ios->timing == MMC_TIMING_UHS_DDR50) ||
1395                     (ios->timing == MMC_TIMING_UHS_SDR25))
1396                         ctrl |= SDHCI_CTRL_HISPD;
1397
1398                 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1399                 if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1400                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1401                         /*
1402                          * We only need to set Driver Strength if the
1403                          * preset value enable is not set.
1404                          */
1405                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1406                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1407                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1408                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1409                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1410
1411                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1412                 } else {
1413                         /*
1414                          * According to SDHC Spec v3.00, if the Preset Value
1415                          * Enable in the Host Control 2 register is set, we
1416                          * need to reset SD Clock Enable before changing High
1417                          * Speed Enable to avoid generating clock gliches.
1418                          */
1419
1420                         /* Reset SD Clock Enable */
1421                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1422                         clk &= ~SDHCI_CLOCK_CARD_EN;
1423                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1424
1425                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1426
1427                         /* Re-enable SD Clock */
1428                         clock = host->clock;
1429                         host->clock = 0;
1430                         sdhci_set_clock(host, clock);
1431                 }
1432
1433
1434                 /* Reset SD Clock Enable */
1435                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1436                 clk &= ~SDHCI_CLOCK_CARD_EN;
1437                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1438
1439                 if (host->ops->set_uhs_signaling)
1440                         host->ops->set_uhs_signaling(host, ios->timing);
1441                 else {
1442                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1443                         /* Select Bus Speed Mode for host */
1444                         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1445                         if (ios->timing == MMC_TIMING_MMC_HS200)
1446                                 ctrl_2 |= SDHCI_CTRL_HS_SDR200;
1447                         else if (ios->timing == MMC_TIMING_UHS_SDR12)
1448                                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1449                         else if (ios->timing == MMC_TIMING_UHS_SDR25)
1450                                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1451                         else if (ios->timing == MMC_TIMING_UHS_SDR50)
1452                                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1453                         else if (ios->timing == MMC_TIMING_UHS_SDR104)
1454                                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1455                         else if (ios->timing == MMC_TIMING_UHS_DDR50)
1456                                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1457                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1458                 }
1459
1460                 /* Re-enable SD Clock */
1461                 clock = host->clock;
1462                 host->clock = 0;
1463                 sdhci_set_clock(host, clock);
1464         } else
1465                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1466
1467         /*
1468          * Some (ENE) controllers go apeshit on some ios operation,
1469          * signalling timeout and CRC errors even on CMD0. Resetting
1470          * it on each ios seems to solve the problem.
1471          */
1472         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1473                 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1474
1475         mmiowb();
1476         spin_unlock_irqrestore(&host->lock, flags);
1477 }
1478
1479 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1480 {
1481         struct sdhci_host *host = mmc_priv(mmc);
1482
1483         sdhci_runtime_pm_get(host);
1484         sdhci_do_set_ios(host, ios);
1485         sdhci_runtime_pm_put(host);
1486 }
1487
1488 static int sdhci_check_ro(struct sdhci_host *host)
1489 {
1490         unsigned long flags;
1491         int is_readonly;
1492
1493         spin_lock_irqsave(&host->lock, flags);
1494
1495         if (host->flags & SDHCI_DEVICE_DEAD)
1496                 is_readonly = 0;
1497         else if (host->ops->get_ro)
1498                 is_readonly = host->ops->get_ro(host);
1499         else
1500                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1501                                 & SDHCI_WRITE_PROTECT);
1502
1503         spin_unlock_irqrestore(&host->lock, flags);
1504
1505         /* This quirk needs to be replaced by a callback-function later */
1506         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1507                 !is_readonly : is_readonly;
1508 }
1509
1510 #define SAMPLE_COUNT    5
1511
1512 static int sdhci_do_get_ro(struct sdhci_host *host)
1513 {
1514         int i, ro_count;
1515
1516         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1517                 return sdhci_check_ro(host);
1518
1519         ro_count = 0;
1520         for (i = 0; i < SAMPLE_COUNT; i++) {
1521                 if (sdhci_check_ro(host)) {
1522                         if (++ro_count > SAMPLE_COUNT / 2)
1523                                 return 1;
1524                 }
1525                 msleep(30);
1526         }
1527         return 0;
1528 }
1529
1530 static void sdhci_hw_reset(struct mmc_host *mmc)
1531 {
1532         struct sdhci_host *host = mmc_priv(mmc);
1533
1534         if (host->ops && host->ops->hw_reset)
1535                 host->ops->hw_reset(host);
1536 }
1537
1538 static int sdhci_get_ro(struct mmc_host *mmc)
1539 {
1540         struct sdhci_host *host = mmc_priv(mmc);
1541         int ret;
1542
1543         sdhci_runtime_pm_get(host);
1544         ret = sdhci_do_get_ro(host);
1545         sdhci_runtime_pm_put(host);
1546         return ret;
1547 }
1548
1549 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1550 {
1551         if (host->flags & SDHCI_DEVICE_DEAD)
1552                 goto out;
1553
1554         if (enable)
1555                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1556         else
1557                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1558
1559         /* SDIO IRQ will be enabled as appropriate in runtime resume */
1560         if (host->runtime_suspended)
1561                 goto out;
1562
1563         if (enable)
1564                 sdhci_unmask_irqs(host, SDHCI_INT_CARD_INT);
1565         else
1566                 sdhci_mask_irqs(host, SDHCI_INT_CARD_INT);
1567 out:
1568         mmiowb();
1569 }
1570
1571 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1572 {
1573         struct sdhci_host *host = mmc_priv(mmc);
1574         unsigned long flags;
1575
1576         spin_lock_irqsave(&host->lock, flags);
1577         sdhci_enable_sdio_irq_nolock(host, enable);
1578         spin_unlock_irqrestore(&host->lock, flags);
1579 }
1580
1581 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1582                                                 struct mmc_ios *ios)
1583 {
1584         u8 pwr;
1585         u16 clk, ctrl;
1586         u32 present_state;
1587
1588         /*
1589          * Signal Voltage Switching is only applicable for Host Controllers
1590          * v3.00 and above.
1591          */
1592         if (host->version < SDHCI_SPEC_300)
1593                 return 0;
1594
1595         /*
1596          * We first check whether the request is to set signalling voltage
1597          * to 3.3V. If so, we change the voltage to 3.3V and return quickly.
1598          */
1599         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1600         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1601                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1602                 ctrl &= ~SDHCI_CTRL_VDD_180;
1603                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1604
1605                 /* Wait for 5ms */
1606                 usleep_range(5000, 5500);
1607
1608                 /* 3.3V regulator output should be stable within 5 ms */
1609                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1610                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1611                         return 0;
1612                 else {
1613                         pr_info(DRIVER_NAME ": Switching to 3.3V "
1614                                 "signalling voltage failed\n");
1615                         return -EIO;
1616                 }
1617         } else if (!(ctrl & SDHCI_CTRL_VDD_180) &&
1618                   (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180)) {
1619                 /* Stop SDCLK */
1620                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1621                 clk &= ~SDHCI_CLOCK_CARD_EN;
1622                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1623
1624                 /* Check whether DAT[3:0] is 0000 */
1625                 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1626                 if (!((present_state & SDHCI_DATA_LVL_MASK) >>
1627                        SDHCI_DATA_LVL_SHIFT)) {
1628                         /*
1629                          * Enable 1.8V Signal Enable in the Host Control2
1630                          * register
1631                          */
1632                         ctrl |= SDHCI_CTRL_VDD_180;
1633                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1634
1635                         /* Wait for 5ms */
1636                         usleep_range(5000, 5500);
1637
1638                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1639                         if (ctrl & SDHCI_CTRL_VDD_180) {
1640                                 /* Provide SDCLK again and wait for 1ms*/
1641                                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1642                                 clk |= SDHCI_CLOCK_CARD_EN;
1643                                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1644                                 usleep_range(1000, 1500);
1645
1646                                 /*
1647                                  * If DAT[3:0] level is 1111b, then the card
1648                                  * was successfully switched to 1.8V signaling.
1649                                  */
1650                                 present_state = sdhci_readl(host,
1651                                                         SDHCI_PRESENT_STATE);
1652                                 if ((present_state & SDHCI_DATA_LVL_MASK) ==
1653                                      SDHCI_DATA_LVL_MASK)
1654                                         return 0;
1655                         }
1656                 }
1657
1658                 /*
1659                  * If we are here, that means the switch to 1.8V signaling
1660                  * failed. We power cycle the card, and retry initialization
1661                  * sequence by setting S18R to 0.
1662                  */
1663                 pwr = sdhci_readb(host, SDHCI_POWER_CONTROL);
1664                 pwr &= ~SDHCI_POWER_ON;
1665                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1666
1667                 /* Wait for 1ms as per the spec */
1668                 usleep_range(1000, 1500);
1669                 pwr |= SDHCI_POWER_ON;
1670                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1671
1672                 pr_info(DRIVER_NAME ": Switching to 1.8V signalling "
1673                         "voltage failed, retrying with S18R set to 0\n");
1674                 return -EAGAIN;
1675         } else
1676                 /* No signal voltage switch required */
1677                 return 0;
1678 }
1679
1680 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1681         struct mmc_ios *ios)
1682 {
1683         struct sdhci_host *host = mmc_priv(mmc);
1684         int err;
1685
1686         if (host->version < SDHCI_SPEC_300)
1687                 return 0;
1688         sdhci_runtime_pm_get(host);
1689         err = sdhci_do_start_signal_voltage_switch(host, ios);
1690         sdhci_runtime_pm_put(host);
1691         return err;
1692 }
1693
1694 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1695 {
1696         struct sdhci_host *host;
1697         u16 ctrl;
1698         u32 ier;
1699         int tuning_loop_counter = MAX_TUNING_LOOP;
1700         unsigned long timeout;
1701         int err = 0;
1702         bool requires_tuning_nonuhs = false;
1703
1704         host = mmc_priv(mmc);
1705
1706         sdhci_runtime_pm_get(host);
1707         disable_irq(host->irq);
1708         spin_lock(&host->lock);
1709
1710         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1711
1712         /*
1713          * The Host Controller needs tuning only in case of SDR104 mode
1714          * and for SDR50 mode when Use Tuning for SDR50 is set in the
1715          * Capabilities register.
1716          * If the Host Controller supports the HS200 mode then the
1717          * tuning function has to be executed.
1718          */
1719         if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) &&
1720             (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1721              host->flags & SDHCI_HS200_NEEDS_TUNING))
1722                 requires_tuning_nonuhs = true;
1723
1724         if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) ||
1725             requires_tuning_nonuhs)
1726                 ctrl |= SDHCI_CTRL_EXEC_TUNING;
1727         else {
1728                 spin_unlock(&host->lock);
1729                 enable_irq(host->irq);
1730                 sdhci_runtime_pm_put(host);
1731                 return 0;
1732         }
1733
1734         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1735
1736         /*
1737          * As per the Host Controller spec v3.00, tuning command
1738          * generates Buffer Read Ready interrupt, so enable that.
1739          *
1740          * Note: The spec clearly says that when tuning sequence
1741          * is being performed, the controller does not generate
1742          * interrupts other than Buffer Read Ready interrupt. But
1743          * to make sure we don't hit a controller bug, we _only_
1744          * enable Buffer Read Ready interrupt here.
1745          */
1746         ier = sdhci_readl(host, SDHCI_INT_ENABLE);
1747         sdhci_clear_set_irqs(host, ier, SDHCI_INT_DATA_AVAIL);
1748
1749         /*
1750          * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1751          * of loops reaches 40 times or a timeout of 150ms occurs.
1752          */
1753         timeout = 150;
1754         do {
1755                 struct mmc_command cmd = {0};
1756                 struct mmc_request mrq = {NULL};
1757
1758                 if (!tuning_loop_counter && !timeout)
1759                         break;
1760
1761                 cmd.opcode = opcode;
1762                 cmd.arg = 0;
1763                 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1764                 cmd.retries = 0;
1765                 cmd.data = NULL;
1766                 cmd.error = 0;
1767
1768                 mrq.cmd = &cmd;
1769                 host->mrq = &mrq;
1770
1771                 /*
1772                  * In response to CMD19, the card sends 64 bytes of tuning
1773                  * block to the Host Controller. So we set the block size
1774                  * to 64 here.
1775                  */
1776                 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1777                         if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1778                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1779                                              SDHCI_BLOCK_SIZE);
1780                         else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1781                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1782                                              SDHCI_BLOCK_SIZE);
1783                 } else {
1784                         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1785                                      SDHCI_BLOCK_SIZE);
1786                 }
1787
1788                 /*
1789                  * The tuning block is sent by the card to the host controller.
1790                  * So we set the TRNS_READ bit in the Transfer Mode register.
1791                  * This also takes care of setting DMA Enable and Multi Block
1792                  * Select in the same register to 0.
1793                  */
1794                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1795
1796                 sdhci_send_command(host, &cmd);
1797
1798                 host->cmd = NULL;
1799                 host->mrq = NULL;
1800
1801                 spin_unlock(&host->lock);
1802                 enable_irq(host->irq);
1803
1804                 /* Wait for Buffer Read Ready interrupt */
1805                 wait_event_interruptible_timeout(host->buf_ready_int,
1806                                         (host->tuning_done == 1),
1807                                         msecs_to_jiffies(50));
1808                 disable_irq(host->irq);
1809                 spin_lock(&host->lock);
1810
1811                 if (!host->tuning_done) {
1812                         pr_info(DRIVER_NAME ": Timeout waiting for "
1813                                 "Buffer Read Ready interrupt during tuning "
1814                                 "procedure, falling back to fixed sampling "
1815                                 "clock\n");
1816                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1817                         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1818                         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1819                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1820
1821                         err = -EIO;
1822                         goto out;
1823                 }
1824
1825                 host->tuning_done = 0;
1826
1827                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1828                 tuning_loop_counter--;
1829                 timeout--;
1830                 mdelay(1);
1831         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1832
1833         /*
1834          * The Host Driver has exhausted the maximum number of loops allowed,
1835          * so use fixed sampling frequency.
1836          */
1837         if (!tuning_loop_counter || !timeout) {
1838                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1839                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1840         } else {
1841                 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
1842                         pr_info(DRIVER_NAME ": Tuning procedure"
1843                                 " failed, falling back to fixed sampling"
1844                                 " clock\n");
1845                         err = -EIO;
1846                 }
1847         }
1848
1849 out:
1850         /*
1851          * If this is the very first time we are here, we start the retuning
1852          * timer. Since only during the first time, SDHCI_NEEDS_RETUNING
1853          * flag won't be set, we check this condition before actually starting
1854          * the timer.
1855          */
1856         if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
1857             (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
1858                 mod_timer(&host->tuning_timer, jiffies +
1859                         host->tuning_count * HZ);
1860                 /* Tuning mode 1 limits the maximum data length to 4MB */
1861                 mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
1862         } else {
1863                 host->flags &= ~SDHCI_NEEDS_RETUNING;
1864                 /* Reload the new initial value for timer */
1865                 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
1866                         mod_timer(&host->tuning_timer, jiffies +
1867                                 host->tuning_count * HZ);
1868         }
1869
1870         /*
1871          * In case tuning fails, host controllers which support re-tuning can
1872          * try tuning again at a later time, when the re-tuning timer expires.
1873          * So for these controllers, we return 0. Since there might be other
1874          * controllers who do not have this capability, we return error for
1875          * them.
1876          */
1877         if (err && host->tuning_count &&
1878             host->tuning_mode == SDHCI_TUNING_MODE_1)
1879                 err = 0;
1880
1881         sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
1882         spin_unlock(&host->lock);
1883         enable_irq(host->irq);
1884         sdhci_runtime_pm_put(host);
1885
1886         return err;
1887 }
1888
1889 static void sdhci_do_enable_preset_value(struct sdhci_host *host, bool enable)
1890 {
1891         u16 ctrl;
1892         unsigned long flags;
1893
1894         /* Host Controller v3.00 defines preset value registers */
1895         if (host->version < SDHCI_SPEC_300)
1896                 return;
1897
1898         spin_lock_irqsave(&host->lock, flags);
1899
1900         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1901
1902         /*
1903          * We only enable or disable Preset Value if they are not already
1904          * enabled or disabled respectively. Otherwise, we bail out.
1905          */
1906         if (enable && !(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1907                 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
1908                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1909                 host->flags |= SDHCI_PV_ENABLED;
1910         } else if (!enable && (ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1911                 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
1912                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1913                 host->flags &= ~SDHCI_PV_ENABLED;
1914         }
1915
1916         spin_unlock_irqrestore(&host->lock, flags);
1917 }
1918
1919 static void sdhci_enable_preset_value(struct mmc_host *mmc, bool enable)
1920 {
1921         struct sdhci_host *host = mmc_priv(mmc);
1922
1923         sdhci_runtime_pm_get(host);
1924         sdhci_do_enable_preset_value(host, enable);
1925         sdhci_runtime_pm_put(host);
1926 }
1927
1928 static const struct mmc_host_ops sdhci_ops = {
1929         .request        = sdhci_request,
1930         .set_ios        = sdhci_set_ios,
1931         .get_ro         = sdhci_get_ro,
1932         .hw_reset       = sdhci_hw_reset,
1933         .enable_sdio_irq = sdhci_enable_sdio_irq,
1934         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
1935         .execute_tuning                 = sdhci_execute_tuning,
1936         .enable_preset_value            = sdhci_enable_preset_value,
1937 };
1938
1939 /*****************************************************************************\
1940  *                                                                           *
1941  * Tasklets                                                                  *
1942  *                                                                           *
1943 \*****************************************************************************/
1944
1945 static void sdhci_tasklet_card(unsigned long param)
1946 {
1947         struct sdhci_host *host;
1948         unsigned long flags;
1949
1950         host = (struct sdhci_host*)param;
1951
1952         spin_lock_irqsave(&host->lock, flags);
1953
1954         /* Check host->mrq first in case we are runtime suspended */
1955         if (host->mrq &&
1956             !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
1957                 pr_err("%s: Card removed during transfer!\n",
1958                         mmc_hostname(host->mmc));
1959                 pr_err("%s: Resetting controller.\n",
1960                         mmc_hostname(host->mmc));
1961
1962                 sdhci_reset(host, SDHCI_RESET_CMD);
1963                 sdhci_reset(host, SDHCI_RESET_DATA);
1964
1965                 host->mrq->cmd->error = -ENOMEDIUM;
1966                 tasklet_schedule(&host->finish_tasklet);
1967         }
1968
1969         spin_unlock_irqrestore(&host->lock, flags);
1970
1971         mmc_detect_change(host->mmc, msecs_to_jiffies(200));
1972 }
1973
1974 static void sdhci_tasklet_finish(unsigned long param)
1975 {
1976         struct sdhci_host *host;
1977         unsigned long flags;
1978         struct mmc_request *mrq;
1979
1980         host = (struct sdhci_host*)param;
1981
1982         spin_lock_irqsave(&host->lock, flags);
1983
1984         /*
1985          * If this tasklet gets rescheduled while running, it will
1986          * be run again afterwards but without any active request.
1987          */
1988         if (!host->mrq) {
1989                 spin_unlock_irqrestore(&host->lock, flags);
1990                 return;
1991         }
1992
1993         del_timer(&host->timer);
1994
1995         mrq = host->mrq;
1996
1997         /*
1998          * The controller needs a reset of internal state machines
1999          * upon error conditions.
2000          */
2001         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2002             ((mrq->cmd && mrq->cmd->error) ||
2003                  (mrq->data && (mrq->data->error ||
2004                   (mrq->data->stop && mrq->data->stop->error))) ||
2005                    (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2006
2007                 /* Some controllers need this kick or reset won't work here */
2008                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
2009                         unsigned int clock;
2010
2011                         /* This is to force an update */
2012                         clock = host->clock;
2013                         host->clock = 0;
2014                         sdhci_set_clock(host, clock);
2015                 }
2016
2017                 /* Spec says we should do both at the same time, but Ricoh
2018                    controllers do not like that. */
2019                 sdhci_reset(host, SDHCI_RESET_CMD);
2020                 sdhci_reset(host, SDHCI_RESET_DATA);
2021         }
2022
2023         host->mrq = NULL;
2024         host->cmd = NULL;
2025         host->data = NULL;
2026
2027 #ifndef SDHCI_USE_LEDS_CLASS
2028         sdhci_deactivate_led(host);
2029 #endif
2030
2031         mmiowb();
2032         spin_unlock_irqrestore(&host->lock, flags);
2033
2034         mmc_request_done(host->mmc, mrq);
2035         sdhci_runtime_pm_put(host);
2036 }
2037
2038 static void sdhci_timeout_timer(unsigned long data)
2039 {
2040         struct sdhci_host *host;
2041         unsigned long flags;
2042
2043         host = (struct sdhci_host*)data;
2044
2045         spin_lock_irqsave(&host->lock, flags);
2046
2047         if (host->mrq) {
2048                 pr_err("%s: Timeout waiting for hardware "
2049                         "interrupt.\n", mmc_hostname(host->mmc));
2050                 sdhci_dumpregs(host);
2051
2052                 if (host->data) {
2053                         host->data->error = -ETIMEDOUT;
2054                         sdhci_finish_data(host);
2055                 } else {
2056                         if (host->cmd)
2057                                 host->cmd->error = -ETIMEDOUT;
2058                         else
2059                                 host->mrq->cmd->error = -ETIMEDOUT;
2060
2061                         tasklet_schedule(&host->finish_tasklet);
2062                 }
2063         }
2064
2065         mmiowb();
2066         spin_unlock_irqrestore(&host->lock, flags);
2067 }
2068
2069 static void sdhci_tuning_timer(unsigned long data)
2070 {
2071         struct sdhci_host *host;
2072         unsigned long flags;
2073
2074         host = (struct sdhci_host *)data;
2075
2076         spin_lock_irqsave(&host->lock, flags);
2077
2078         host->flags |= SDHCI_NEEDS_RETUNING;
2079
2080         spin_unlock_irqrestore(&host->lock, flags);
2081 }
2082
2083 /*****************************************************************************\
2084  *                                                                           *
2085  * Interrupt handling                                                        *
2086  *                                                                           *
2087 \*****************************************************************************/
2088
2089 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
2090 {
2091         BUG_ON(intmask == 0);
2092
2093         if (!host->cmd) {
2094                 pr_err("%s: Got command interrupt 0x%08x even "
2095                         "though no command operation was in progress.\n",
2096                         mmc_hostname(host->mmc), (unsigned)intmask);
2097                 sdhci_dumpregs(host);
2098                 return;
2099         }
2100
2101         if (intmask & SDHCI_INT_TIMEOUT)
2102                 host->cmd->error = -ETIMEDOUT;
2103         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
2104                         SDHCI_INT_INDEX))
2105                 host->cmd->error = -EILSEQ;
2106
2107         if (host->cmd->error) {
2108                 tasklet_schedule(&host->finish_tasklet);
2109                 return;
2110         }
2111
2112         /*
2113          * The host can send and interrupt when the busy state has
2114          * ended, allowing us to wait without wasting CPU cycles.
2115          * Unfortunately this is overloaded on the "data complete"
2116          * interrupt, so we need to take some care when handling
2117          * it.
2118          *
2119          * Note: The 1.0 specification is a bit ambiguous about this
2120          *       feature so there might be some problems with older
2121          *       controllers.
2122          */
2123         if (host->cmd->flags & MMC_RSP_BUSY) {
2124                 if (host->cmd->data)
2125                         DBG("Cannot wait for busy signal when also "
2126                                 "doing a data transfer");
2127                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
2128                         return;
2129
2130                 /* The controller does not support the end-of-busy IRQ,
2131                  * fall through and take the SDHCI_INT_RESPONSE */
2132         }
2133
2134         if (intmask & SDHCI_INT_RESPONSE)
2135                 sdhci_finish_command(host);
2136 }
2137
2138 #ifdef CONFIG_MMC_DEBUG
2139 static void sdhci_show_adma_error(struct sdhci_host *host)
2140 {
2141         const char *name = mmc_hostname(host->mmc);
2142         u8 *desc = host->adma_desc;
2143         __le32 *dma;
2144         __le16 *len;
2145         u8 attr;
2146
2147         sdhci_dumpregs(host);
2148
2149         while (true) {
2150                 dma = (__le32 *)(desc + 4);
2151                 len = (__le16 *)(desc + 2);
2152                 attr = *desc;
2153
2154                 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2155                     name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr);
2156
2157                 desc += 8;
2158
2159                 if (attr & 2)
2160                         break;
2161         }
2162 }
2163 #else
2164 static void sdhci_show_adma_error(struct sdhci_host *host) { }
2165 #endif
2166
2167 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2168 {
2169         u32 command;
2170         BUG_ON(intmask == 0);
2171
2172         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2173         if (intmask & SDHCI_INT_DATA_AVAIL) {
2174                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2175                 if (command == MMC_SEND_TUNING_BLOCK ||
2176                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2177                         host->tuning_done = 1;
2178                         wake_up(&host->buf_ready_int);
2179                         return;
2180                 }
2181         }
2182
2183         if (!host->data) {
2184                 /*
2185                  * The "data complete" interrupt is also used to
2186                  * indicate that a busy state has ended. See comment
2187                  * above in sdhci_cmd_irq().
2188                  */
2189                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2190                         if (intmask & SDHCI_INT_DATA_END) {
2191                                 sdhci_finish_command(host);
2192                                 return;
2193                         }
2194                 }
2195
2196                 pr_err("%s: Got data interrupt 0x%08x even "
2197                         "though no data operation was in progress.\n",
2198                         mmc_hostname(host->mmc), (unsigned)intmask);
2199                 sdhci_dumpregs(host);
2200
2201                 return;
2202         }
2203
2204         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2205                 host->data->error = -ETIMEDOUT;
2206         else if (intmask & SDHCI_INT_DATA_END_BIT)
2207                 host->data->error = -EILSEQ;
2208         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2209                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2210                         != MMC_BUS_TEST_R)
2211                 host->data->error = -EILSEQ;
2212         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2213                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2214                 sdhci_show_adma_error(host);
2215                 host->data->error = -EIO;
2216         }
2217
2218         if (host->data->error)
2219                 sdhci_finish_data(host);
2220         else {
2221                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2222                         sdhci_transfer_pio(host);
2223
2224                 /*
2225                  * We currently don't do anything fancy with DMA
2226                  * boundaries, but as we can't disable the feature
2227                  * we need to at least restart the transfer.
2228                  *
2229                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2230                  * should return a valid address to continue from, but as
2231                  * some controllers are faulty, don't trust them.
2232                  */
2233                 if (intmask & SDHCI_INT_DMA_END) {
2234                         u32 dmastart, dmanow;
2235                         dmastart = sg_dma_address(host->data->sg);
2236                         dmanow = dmastart + host->data->bytes_xfered;
2237                         /*
2238                          * Force update to the next DMA block boundary.
2239                          */
2240                         dmanow = (dmanow &
2241                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2242                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2243                         host->data->bytes_xfered = dmanow - dmastart;
2244                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2245                                 " next 0x%08x\n",
2246                                 mmc_hostname(host->mmc), dmastart,
2247                                 host->data->bytes_xfered, dmanow);
2248                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2249                 }
2250
2251                 if (intmask & SDHCI_INT_DATA_END) {
2252                         if (host->cmd) {
2253                                 /*
2254                                  * Data managed to finish before the
2255                                  * command completed. Make sure we do
2256                                  * things in the proper order.
2257                                  */
2258                                 host->data_early = 1;
2259                         } else {
2260                                 sdhci_finish_data(host);
2261                         }
2262                 }
2263         }
2264 }
2265
2266 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2267 {
2268         irqreturn_t result;
2269         struct sdhci_host *host = dev_id;
2270         u32 intmask, unexpected = 0;
2271         int cardint = 0, max_loops = 16;
2272
2273         spin_lock(&host->lock);
2274
2275         if (host->runtime_suspended) {
2276                 spin_unlock(&host->lock);
2277                 pr_warning("%s: got irq while runtime suspended\n",
2278                        mmc_hostname(host->mmc));
2279                 return IRQ_HANDLED;
2280         }
2281
2282         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2283
2284         if (!intmask || intmask == 0xffffffff) {
2285                 result = IRQ_NONE;
2286                 goto out;
2287         }
2288
2289 again:
2290         DBG("*** %s got interrupt: 0x%08x\n",
2291                 mmc_hostname(host->mmc), intmask);
2292
2293         if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2294                 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2295                               SDHCI_CARD_PRESENT;
2296
2297                 /*
2298                  * There is a observation on i.mx esdhc.  INSERT bit will be
2299                  * immediately set again when it gets cleared, if a card is
2300                  * inserted.  We have to mask the irq to prevent interrupt
2301                  * storm which will freeze the system.  And the REMOVE gets
2302                  * the same situation.
2303                  *
2304                  * More testing are needed here to ensure it works for other
2305                  * platforms though.
2306                  */
2307                 sdhci_mask_irqs(host, present ? SDHCI_INT_CARD_INSERT :
2308                                                 SDHCI_INT_CARD_REMOVE);
2309                 sdhci_unmask_irqs(host, present ? SDHCI_INT_CARD_REMOVE :
2310                                                   SDHCI_INT_CARD_INSERT);
2311
2312                 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2313                              SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2314                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
2315                 tasklet_schedule(&host->card_tasklet);
2316         }
2317
2318         if (intmask & SDHCI_INT_CMD_MASK) {
2319                 sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK,
2320                         SDHCI_INT_STATUS);
2321                 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2322         }
2323
2324         if (intmask & SDHCI_INT_DATA_MASK) {
2325                 sdhci_writel(host, intmask & SDHCI_INT_DATA_MASK,
2326                         SDHCI_INT_STATUS);
2327                 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2328         }
2329
2330         intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
2331
2332         intmask &= ~SDHCI_INT_ERROR;
2333
2334         if (intmask & SDHCI_INT_BUS_POWER) {
2335                 pr_err("%s: Card is consuming too much power!\n",
2336                         mmc_hostname(host->mmc));
2337                 sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS);
2338         }
2339
2340         intmask &= ~SDHCI_INT_BUS_POWER;
2341
2342         if (intmask & SDHCI_INT_CARD_INT)
2343                 cardint = 1;
2344
2345         intmask &= ~SDHCI_INT_CARD_INT;
2346
2347         if (intmask) {
2348                 unexpected |= intmask;
2349                 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2350         }
2351
2352         result = IRQ_HANDLED;
2353
2354         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2355         if (intmask && --max_loops)
2356                 goto again;
2357 out:
2358         spin_unlock(&host->lock);
2359
2360         if (unexpected) {
2361                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2362                            mmc_hostname(host->mmc), unexpected);
2363                 sdhci_dumpregs(host);
2364         }
2365         /*
2366          * We have to delay this as it calls back into the driver.
2367          */
2368         if (cardint)
2369                 mmc_signal_sdio_irq(host->mmc);
2370
2371         return result;
2372 }
2373
2374 /*****************************************************************************\
2375  *                                                                           *
2376  * Suspend/resume                                                            *
2377  *                                                                           *
2378 \*****************************************************************************/
2379
2380 #ifdef CONFIG_PM
2381
2382 int sdhci_suspend_host(struct sdhci_host *host)
2383 {
2384         int ret;
2385         bool has_tuning_timer;
2386
2387         if (host->ops->platform_suspend)
2388                 host->ops->platform_suspend(host);
2389
2390         sdhci_disable_card_detection(host);
2391
2392         /* Disable tuning since we are suspending */
2393         has_tuning_timer = host->version >= SDHCI_SPEC_300 &&
2394                 host->tuning_count && host->tuning_mode == SDHCI_TUNING_MODE_1;
2395         if (has_tuning_timer) {
2396                 del_timer_sync(&host->tuning_timer);
2397                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2398         }
2399
2400         ret = mmc_suspend_host(host->mmc);
2401         if (ret) {
2402                 if (has_tuning_timer) {
2403                         host->flags |= SDHCI_NEEDS_RETUNING;
2404                         mod_timer(&host->tuning_timer, jiffies +
2405                                         host->tuning_count * HZ);
2406                 }
2407
2408                 sdhci_enable_card_detection(host);
2409
2410                 return ret;
2411         }
2412
2413         free_irq(host->irq, host);
2414
2415         return ret;
2416 }
2417
2418 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2419
2420 int sdhci_resume_host(struct sdhci_host *host)
2421 {
2422         int ret;
2423
2424         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2425                 if (host->ops->enable_dma)
2426                         host->ops->enable_dma(host);
2427         }
2428
2429         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
2430                           mmc_hostname(host->mmc), host);
2431         if (ret)
2432                 return ret;
2433
2434         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2435             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2436                 /* Card keeps power but host controller does not */
2437                 sdhci_init(host, 0);
2438                 host->pwr = 0;
2439                 host->clock = 0;
2440                 sdhci_do_set_ios(host, &host->mmc->ios);
2441         } else {
2442                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2443                 mmiowb();
2444         }
2445
2446         ret = mmc_resume_host(host->mmc);
2447         sdhci_enable_card_detection(host);
2448
2449         if (host->ops->platform_resume)
2450                 host->ops->platform_resume(host);
2451
2452         /* Set the re-tuning expiration flag */
2453         if ((host->version >= SDHCI_SPEC_300) && host->tuning_count &&
2454             (host->tuning_mode == SDHCI_TUNING_MODE_1))
2455                 host->flags |= SDHCI_NEEDS_RETUNING;
2456
2457         return ret;
2458 }
2459
2460 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2461
2462 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2463 {
2464         u8 val;
2465         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2466         val |= SDHCI_WAKE_ON_INT;
2467         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2468 }
2469
2470 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2471
2472 #endif /* CONFIG_PM */
2473
2474 #ifdef CONFIG_PM_RUNTIME
2475
2476 static int sdhci_runtime_pm_get(struct sdhci_host *host)
2477 {
2478         return pm_runtime_get_sync(host->mmc->parent);
2479 }
2480
2481 static int sdhci_runtime_pm_put(struct sdhci_host *host)
2482 {
2483         pm_runtime_mark_last_busy(host->mmc->parent);
2484         return pm_runtime_put_autosuspend(host->mmc->parent);
2485 }
2486
2487 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2488 {
2489         unsigned long flags;
2490         int ret = 0;
2491
2492         /* Disable tuning since we are suspending */
2493         if (host->version >= SDHCI_SPEC_300 &&
2494             host->tuning_mode == SDHCI_TUNING_MODE_1) {
2495                 del_timer_sync(&host->tuning_timer);
2496                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2497         }
2498
2499         spin_lock_irqsave(&host->lock, flags);
2500         sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
2501         spin_unlock_irqrestore(&host->lock, flags);
2502
2503         synchronize_irq(host->irq);
2504
2505         spin_lock_irqsave(&host->lock, flags);
2506         host->runtime_suspended = true;
2507         spin_unlock_irqrestore(&host->lock, flags);
2508
2509         return ret;
2510 }
2511 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2512
2513 int sdhci_runtime_resume_host(struct sdhci_host *host)
2514 {
2515         unsigned long flags;
2516         int ret = 0, host_flags = host->flags;
2517
2518         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2519                 if (host->ops->enable_dma)
2520                         host->ops->enable_dma(host);
2521         }
2522
2523         sdhci_init(host, 0);
2524
2525         /* Force clock and power re-program */
2526         host->pwr = 0;
2527         host->clock = 0;
2528         sdhci_do_set_ios(host, &host->mmc->ios);
2529
2530         sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2531         if (host_flags & SDHCI_PV_ENABLED)
2532                 sdhci_do_enable_preset_value(host, true);
2533
2534         /* Set the re-tuning expiration flag */
2535         if ((host->version >= SDHCI_SPEC_300) && host->tuning_count &&
2536             (host->tuning_mode == SDHCI_TUNING_MODE_1))
2537                 host->flags |= SDHCI_NEEDS_RETUNING;
2538
2539         spin_lock_irqsave(&host->lock, flags);
2540
2541         host->runtime_suspended = false;
2542
2543         /* Enable SDIO IRQ */
2544         if ((host->flags & SDHCI_SDIO_IRQ_ENABLED))
2545                 sdhci_enable_sdio_irq_nolock(host, true);
2546
2547         /* Enable Card Detection */
2548         sdhci_enable_card_detection(host);
2549
2550         spin_unlock_irqrestore(&host->lock, flags);
2551
2552         return ret;
2553 }
2554 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2555
2556 #endif
2557
2558 /*****************************************************************************\
2559  *                                                                           *
2560  * Device allocation/registration                                            *
2561  *                                                                           *
2562 \*****************************************************************************/
2563
2564 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2565         size_t priv_size)
2566 {
2567         struct mmc_host *mmc;
2568         struct sdhci_host *host;
2569
2570         WARN_ON(dev == NULL);
2571
2572         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2573         if (!mmc)
2574                 return ERR_PTR(-ENOMEM);
2575
2576         host = mmc_priv(mmc);
2577         host->mmc = mmc;
2578
2579         return host;
2580 }
2581
2582 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2583
2584 int sdhci_add_host(struct sdhci_host *host)
2585 {
2586         struct mmc_host *mmc;
2587         u32 caps[2];
2588         u32 max_current_caps;
2589         unsigned int ocr_avail;
2590         int ret;
2591
2592         WARN_ON(host == NULL);
2593         if (host == NULL)
2594                 return -EINVAL;
2595
2596         mmc = host->mmc;
2597
2598         if (debug_quirks)
2599                 host->quirks = debug_quirks;
2600         if (debug_quirks2)
2601                 host->quirks2 = debug_quirks2;
2602
2603         sdhci_reset(host, SDHCI_RESET_ALL);
2604
2605         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2606         host->version = (host->version & SDHCI_SPEC_VER_MASK)
2607                                 >> SDHCI_SPEC_VER_SHIFT;
2608         if (host->version > SDHCI_SPEC_300) {
2609                 pr_err("%s: Unknown controller version (%d). "
2610                         "You may experience problems.\n", mmc_hostname(mmc),
2611                         host->version);
2612         }
2613
2614         caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2615                 sdhci_readl(host, SDHCI_CAPABILITIES);
2616
2617         caps[1] = (host->version >= SDHCI_SPEC_300) ?
2618                 sdhci_readl(host, SDHCI_CAPABILITIES_1) : 0;
2619
2620         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2621                 host->flags |= SDHCI_USE_SDMA;
2622         else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2623                 DBG("Controller doesn't have SDMA capability\n");
2624         else
2625                 host->flags |= SDHCI_USE_SDMA;
2626
2627         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2628                 (host->flags & SDHCI_USE_SDMA)) {
2629                 DBG("Disabling DMA as it is marked broken\n");
2630                 host->flags &= ~SDHCI_USE_SDMA;
2631         }
2632
2633         if ((host->version >= SDHCI_SPEC_200) &&
2634                 (caps[0] & SDHCI_CAN_DO_ADMA2))
2635                 host->flags |= SDHCI_USE_ADMA;
2636
2637         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2638                 (host->flags & SDHCI_USE_ADMA)) {
2639                 DBG("Disabling ADMA as it is marked broken\n");
2640                 host->flags &= ~SDHCI_USE_ADMA;
2641         }
2642
2643         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2644                 if (host->ops->enable_dma) {
2645                         if (host->ops->enable_dma(host)) {
2646                                 pr_warning("%s: No suitable DMA "
2647                                         "available. Falling back to PIO.\n",
2648                                         mmc_hostname(mmc));
2649                                 host->flags &=
2650                                         ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2651                         }
2652                 }
2653         }
2654
2655         if (host->flags & SDHCI_USE_ADMA) {
2656                 /*
2657                  * We need to allocate descriptors for all sg entries
2658                  * (128) and potentially one alignment transfer for
2659                  * each of those entries.
2660                  */
2661                 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
2662                 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
2663                 if (!host->adma_desc || !host->align_buffer) {
2664                         kfree(host->adma_desc);
2665                         kfree(host->align_buffer);
2666                         pr_warning("%s: Unable to allocate ADMA "
2667                                 "buffers. Falling back to standard DMA.\n",
2668                                 mmc_hostname(mmc));
2669                         host->flags &= ~SDHCI_USE_ADMA;
2670                 }
2671         }
2672
2673         /*
2674          * If we use DMA, then it's up to the caller to set the DMA
2675          * mask, but PIO does not need the hw shim so we set a new
2676          * mask here in that case.
2677          */
2678         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
2679                 host->dma_mask = DMA_BIT_MASK(64);
2680                 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
2681         }
2682
2683         if (host->version >= SDHCI_SPEC_300)
2684                 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
2685                         >> SDHCI_CLOCK_BASE_SHIFT;
2686         else
2687                 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
2688                         >> SDHCI_CLOCK_BASE_SHIFT;
2689
2690         host->max_clk *= 1000000;
2691         if (host->max_clk == 0 || host->quirks &
2692                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
2693                 if (!host->ops->get_max_clock) {
2694                         pr_err("%s: Hardware doesn't specify base clock "
2695                                "frequency.\n", mmc_hostname(mmc));
2696                         return -ENODEV;
2697                 }
2698                 host->max_clk = host->ops->get_max_clock(host);
2699         }
2700
2701         /*
2702          * In case of Host Controller v3.00, find out whether clock
2703          * multiplier is supported.
2704          */
2705         host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
2706                         SDHCI_CLOCK_MUL_SHIFT;
2707
2708         /*
2709          * In case the value in Clock Multiplier is 0, then programmable
2710          * clock mode is not supported, otherwise the actual clock
2711          * multiplier is one more than the value of Clock Multiplier
2712          * in the Capabilities Register.
2713          */
2714         if (host->clk_mul)
2715                 host->clk_mul += 1;
2716
2717         /*
2718          * Set host parameters.
2719          */
2720         mmc->ops = &sdhci_ops;
2721         mmc->f_max = host->max_clk;
2722         if (host->ops->get_min_clock)
2723                 mmc->f_min = host->ops->get_min_clock(host);
2724         else if (host->version >= SDHCI_SPEC_300) {
2725                 if (host->clk_mul) {
2726                         mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
2727                         mmc->f_max = host->max_clk * host->clk_mul;
2728                 } else
2729                         mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
2730         } else
2731                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
2732
2733         host->timeout_clk =
2734                 (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
2735         if (host->timeout_clk == 0) {
2736                 if (host->ops->get_timeout_clock) {
2737                         host->timeout_clk = host->ops->get_timeout_clock(host);
2738                 } else if (!(host->quirks &
2739                                 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
2740                         pr_err("%s: Hardware doesn't specify timeout clock "
2741                                "frequency.\n", mmc_hostname(mmc));
2742                         return -ENODEV;
2743                 }
2744         }
2745         if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
2746                 host->timeout_clk *= 1000;
2747
2748         if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)
2749                 host->timeout_clk = mmc->f_max / 1000;
2750
2751         mmc->max_discard_to = (1 << 27) / host->timeout_clk;
2752
2753         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
2754
2755         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
2756                 host->flags |= SDHCI_AUTO_CMD12;
2757
2758         /* Auto-CMD23 stuff only works in ADMA or PIO. */
2759         if ((host->version >= SDHCI_SPEC_300) &&
2760             ((host->flags & SDHCI_USE_ADMA) ||
2761              !(host->flags & SDHCI_USE_SDMA))) {
2762                 host->flags |= SDHCI_AUTO_CMD23;
2763                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
2764         } else {
2765                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
2766         }
2767
2768         /*
2769          * A controller may support 8-bit width, but the board itself
2770          * might not have the pins brought out.  Boards that support
2771          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
2772          * their platform code before calling sdhci_add_host(), and we
2773          * won't assume 8-bit width for hosts without that CAP.
2774          */
2775         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
2776                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2777
2778         if (caps[0] & SDHCI_CAN_DO_HISPD)
2779                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2780
2781         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
2782             mmc_card_is_removable(mmc))
2783                 mmc->caps |= MMC_CAP_NEEDS_POLL;
2784
2785         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
2786         if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
2787                        SDHCI_SUPPORT_DDR50))
2788                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
2789
2790         /* SDR104 supports also implies SDR50 support */
2791         if (caps[1] & SDHCI_SUPPORT_SDR104)
2792                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
2793         else if (caps[1] & SDHCI_SUPPORT_SDR50)
2794                 mmc->caps |= MMC_CAP_UHS_SDR50;
2795
2796         if (caps[1] & SDHCI_SUPPORT_DDR50)
2797                 mmc->caps |= MMC_CAP_UHS_DDR50;
2798
2799         /* Does the host need tuning for SDR50? */
2800         if (caps[1] & SDHCI_USE_SDR50_TUNING)
2801                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
2802
2803         /* Does the host need tuning for HS200? */
2804         if (mmc->caps2 & MMC_CAP2_HS200)
2805                 host->flags |= SDHCI_HS200_NEEDS_TUNING;
2806
2807         /* Driver Type(s) (A, C, D) supported by the host */
2808         if (caps[1] & SDHCI_DRIVER_TYPE_A)
2809                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
2810         if (caps[1] & SDHCI_DRIVER_TYPE_C)
2811                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
2812         if (caps[1] & SDHCI_DRIVER_TYPE_D)
2813                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
2814
2815         /*
2816          * If Power Off Notify capability is enabled by the host,
2817          * set notify to short power off notify timeout value.
2818          */
2819         if (mmc->caps2 & MMC_CAP2_POWEROFF_NOTIFY)
2820                 mmc->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
2821         else
2822                 mmc->power_notify_type = MMC_HOST_PW_NOTIFY_NONE;
2823
2824         /* Initial value for re-tuning timer count */
2825         host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
2826                               SDHCI_RETUNING_TIMER_COUNT_SHIFT;
2827
2828         /*
2829          * In case Re-tuning Timer is not disabled, the actual value of
2830          * re-tuning timer will be 2 ^ (n - 1).
2831          */
2832         if (host->tuning_count)
2833                 host->tuning_count = 1 << (host->tuning_count - 1);
2834
2835         /* Re-tuning mode supported by the Host Controller */
2836         host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
2837                              SDHCI_RETUNING_MODE_SHIFT;
2838
2839         ocr_avail = 0;
2840         /*
2841          * According to SD Host Controller spec v3.00, if the Host System
2842          * can afford more than 150mA, Host Driver should set XPC to 1. Also
2843          * the value is meaningful only if Voltage Support in the Capabilities
2844          * register is set. The actual current value is 4 times the register
2845          * value.
2846          */
2847         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
2848
2849         if (caps[0] & SDHCI_CAN_VDD_330) {
2850                 int max_current_330;
2851
2852                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
2853
2854                 max_current_330 = ((max_current_caps &
2855                                    SDHCI_MAX_CURRENT_330_MASK) >>
2856                                    SDHCI_MAX_CURRENT_330_SHIFT) *
2857                                    SDHCI_MAX_CURRENT_MULTIPLIER;
2858
2859                 if (max_current_330 > 150)
2860                         mmc->caps |= MMC_CAP_SET_XPC_330;
2861         }
2862         if (caps[0] & SDHCI_CAN_VDD_300) {
2863                 int max_current_300;
2864
2865                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
2866
2867                 max_current_300 = ((max_current_caps &
2868                                    SDHCI_MAX_CURRENT_300_MASK) >>
2869                                    SDHCI_MAX_CURRENT_300_SHIFT) *
2870                                    SDHCI_MAX_CURRENT_MULTIPLIER;
2871
2872                 if (max_current_300 > 150)
2873                         mmc->caps |= MMC_CAP_SET_XPC_300;
2874         }
2875         if (caps[0] & SDHCI_CAN_VDD_180) {
2876                 int max_current_180;
2877
2878                 ocr_avail |= MMC_VDD_165_195;
2879
2880                 max_current_180 = ((max_current_caps &
2881                                    SDHCI_MAX_CURRENT_180_MASK) >>
2882                                    SDHCI_MAX_CURRENT_180_SHIFT) *
2883                                    SDHCI_MAX_CURRENT_MULTIPLIER;
2884
2885                 if (max_current_180 > 150)
2886                         mmc->caps |= MMC_CAP_SET_XPC_180;
2887
2888                 /* Maximum current capabilities of the host at 1.8V */
2889                 if (max_current_180 >= 800)
2890                         mmc->caps |= MMC_CAP_MAX_CURRENT_800;
2891                 else if (max_current_180 >= 600)
2892                         mmc->caps |= MMC_CAP_MAX_CURRENT_600;
2893                 else if (max_current_180 >= 400)
2894                         mmc->caps |= MMC_CAP_MAX_CURRENT_400;
2895                 else
2896                         mmc->caps |= MMC_CAP_MAX_CURRENT_200;
2897         }
2898
2899         mmc->ocr_avail = ocr_avail;
2900         mmc->ocr_avail_sdio = ocr_avail;
2901         if (host->ocr_avail_sdio)
2902                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
2903         mmc->ocr_avail_sd = ocr_avail;
2904         if (host->ocr_avail_sd)
2905                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
2906         else /* normal SD controllers don't support 1.8V */
2907                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
2908         mmc->ocr_avail_mmc = ocr_avail;
2909         if (host->ocr_avail_mmc)
2910                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
2911
2912         if (mmc->ocr_avail == 0) {
2913                 pr_err("%s: Hardware doesn't report any "
2914                         "support voltages.\n", mmc_hostname(mmc));
2915                 return -ENODEV;
2916         }
2917
2918         spin_lock_init(&host->lock);
2919
2920         /*
2921          * Maximum number of segments. Depends on if the hardware
2922          * can do scatter/gather or not.
2923          */
2924         if (host->flags & SDHCI_USE_ADMA)
2925                 mmc->max_segs = 128;
2926         else if (host->flags & SDHCI_USE_SDMA)
2927                 mmc->max_segs = 1;
2928         else /* PIO */
2929                 mmc->max_segs = 128;
2930
2931         /*
2932          * Maximum number of sectors in one transfer. Limited by DMA boundary
2933          * size (512KiB).
2934          */
2935         mmc->max_req_size = 524288;
2936
2937         /*
2938          * Maximum segment size. Could be one segment with the maximum number
2939          * of bytes. When doing hardware scatter/gather, each entry cannot
2940          * be larger than 64 KiB though.
2941          */
2942         if (host->flags & SDHCI_USE_ADMA) {
2943                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
2944                         mmc->max_seg_size = 65535;
2945                 else
2946                         mmc->max_seg_size = 65536;
2947         } else {
2948                 mmc->max_seg_size = mmc->max_req_size;
2949         }
2950
2951         /*
2952          * Maximum block size. This varies from controller to controller and
2953          * is specified in the capabilities register.
2954          */
2955         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
2956                 mmc->max_blk_size = 2;
2957         } else {
2958                 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
2959                                 SDHCI_MAX_BLOCK_SHIFT;
2960                 if (mmc->max_blk_size >= 3) {
2961                         pr_warning("%s: Invalid maximum block size, "
2962                                 "assuming 512 bytes\n", mmc_hostname(mmc));
2963                         mmc->max_blk_size = 0;
2964                 }
2965         }
2966
2967         mmc->max_blk_size = 512 << mmc->max_blk_size;
2968
2969         /*
2970          * Maximum block count.
2971          */
2972         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
2973
2974         /*
2975          * Init tasklets.
2976          */
2977         tasklet_init(&host->card_tasklet,
2978                 sdhci_tasklet_card, (unsigned long)host);
2979         tasklet_init(&host->finish_tasklet,
2980                 sdhci_tasklet_finish, (unsigned long)host);
2981
2982         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
2983
2984         if (host->version >= SDHCI_SPEC_300) {
2985                 init_waitqueue_head(&host->buf_ready_int);
2986
2987                 /* Initialize re-tuning timer */
2988                 init_timer(&host->tuning_timer);
2989                 host->tuning_timer.data = (unsigned long)host;
2990                 host->tuning_timer.function = sdhci_tuning_timer;
2991         }
2992
2993         ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
2994                 mmc_hostname(mmc), host);
2995         if (ret)
2996                 goto untasklet;
2997
2998         host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
2999         if (IS_ERR(host->vmmc)) {
3000                 pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
3001                 host->vmmc = NULL;
3002         }
3003
3004         sdhci_init(host, 0);
3005
3006 #ifdef CONFIG_MMC_DEBUG
3007         sdhci_dumpregs(host);
3008 #endif
3009
3010 #ifdef SDHCI_USE_LEDS_CLASS
3011         snprintf(host->led_name, sizeof(host->led_name),
3012                 "%s::", mmc_hostname(mmc));
3013         host->led.name = host->led_name;
3014         host->led.brightness = LED_OFF;
3015         host->led.default_trigger = mmc_hostname(mmc);
3016         host->led.brightness_set = sdhci_led_control;
3017
3018         ret = led_classdev_register(mmc_dev(mmc), &host->led);
3019         if (ret)
3020                 goto reset;
3021 #endif
3022
3023         mmiowb();
3024
3025         mmc_add_host(mmc);
3026
3027         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3028                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3029                 (host->flags & SDHCI_USE_ADMA) ? "ADMA" :
3030                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3031
3032         sdhci_enable_card_detection(host);
3033
3034         return 0;
3035
3036 #ifdef SDHCI_USE_LEDS_CLASS
3037 reset:
3038         sdhci_reset(host, SDHCI_RESET_ALL);
3039         free_irq(host->irq, host);
3040 #endif
3041 untasklet:
3042         tasklet_kill(&host->card_tasklet);
3043         tasklet_kill(&host->finish_tasklet);
3044
3045         return ret;
3046 }
3047
3048 EXPORT_SYMBOL_GPL(sdhci_add_host);
3049
3050 void sdhci_remove_host(struct sdhci_host *host, int dead)
3051 {
3052         unsigned long flags;
3053
3054         if (dead) {
3055                 spin_lock_irqsave(&host->lock, flags);
3056
3057                 host->flags |= SDHCI_DEVICE_DEAD;
3058
3059                 if (host->mrq) {
3060                         pr_err("%s: Controller removed during "
3061                                 " transfer!\n", mmc_hostname(host->mmc));
3062
3063                         host->mrq->cmd->error = -ENOMEDIUM;
3064                         tasklet_schedule(&host->finish_tasklet);
3065                 }
3066
3067                 spin_unlock_irqrestore(&host->lock, flags);
3068         }
3069
3070         sdhci_disable_card_detection(host);
3071
3072         mmc_remove_host(host->mmc);
3073
3074 #ifdef SDHCI_USE_LEDS_CLASS
3075         led_classdev_unregister(&host->led);
3076 #endif
3077
3078         if (!dead)
3079                 sdhci_reset(host, SDHCI_RESET_ALL);
3080
3081         free_irq(host->irq, host);
3082
3083         del_timer_sync(&host->timer);
3084         if (host->version >= SDHCI_SPEC_300)
3085                 del_timer_sync(&host->tuning_timer);
3086
3087         tasklet_kill(&host->card_tasklet);
3088         tasklet_kill(&host->finish_tasklet);
3089
3090         if (host->vmmc)
3091                 regulator_put(host->vmmc);
3092
3093         kfree(host->adma_desc);
3094         kfree(host->align_buffer);
3095
3096         host->adma_desc = NULL;
3097         host->align_buffer = NULL;
3098 }
3099
3100 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3101
3102 void sdhci_free_host(struct sdhci_host *host)
3103 {
3104         mmc_free_host(host->mmc);
3105 }
3106
3107 EXPORT_SYMBOL_GPL(sdhci_free_host);
3108
3109 /*****************************************************************************\
3110  *                                                                           *
3111  * Driver init/exit                                                          *
3112  *                                                                           *
3113 \*****************************************************************************/
3114
3115 static int __init sdhci_drv_init(void)
3116 {
3117         pr_info(DRIVER_NAME
3118                 ": Secure Digital Host Controller Interface driver\n");
3119         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3120
3121         return 0;
3122 }
3123
3124 static void __exit sdhci_drv_exit(void)
3125 {
3126 }
3127
3128 module_init(sdhci_drv_init);
3129 module_exit(sdhci_drv_exit);
3130
3131 module_param(debug_quirks, uint, 0444);
3132 module_param(debug_quirks2, uint, 0444);
3133
3134 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3135 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3136 MODULE_LICENSE("GPL");
3137
3138 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3139 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");