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 #include <linux/mmc/card.h>
  31 #include <linux/mmc/slot-gpio.h>
  32
  33 #include "sdhci.h"
  34
  35 #define DRIVER_NAME "sdhci"
  36
  37 #define DBG(f, x...) \
  38         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  39
  40 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
  41         defined(CONFIG_MMC_SDHCI_MODULE))
  42 #define SDHCI_USE_LEDS_CLASS
  43 #endif
  44
  45 #define MAX_TUNING_LOOP 40
  46
  47 #define ADMA_SIZE       ((128 * 2 + 1) * 4)
  48
  49 static unsigned int debug_quirks = 0;
  50 static unsigned int debug_quirks2;
  51
  52 static void sdhci_finish_data(struct sdhci_host *);
  53
  54 static void sdhci_finish_command(struct sdhci_host *);
  55 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
  56 static void sdhci_tuning_timer(unsigned long data);
  57 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
  58
  59 #ifdef CONFIG_PM_RUNTIME
  60 static int sdhci_runtime_pm_get(struct sdhci_host *host);
  61 static int sdhci_runtime_pm_put(struct sdhci_host *host);
  62 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
  63 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
  64 #else
  65 static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
  66 {
  67         return 0;
  68 }
  69 static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
  70 {
  71         return 0;
  72 }
  73 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
  74 {
  75 }
  76 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
  77 {
  78 }
  79 #endif
  80
  81 static void sdhci_dumpregs(struct sdhci_host *host)
  82 {
  83         pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
  84                 mmc_hostname(host->mmc));
  85
  86         pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  87                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
  88                 sdhci_readw(host, SDHCI_HOST_VERSION));
  89         pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  90                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
  91                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
  92         pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  93                 sdhci_readl(host, SDHCI_ARGUMENT),
  94                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
  95         pr_debug(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  96                 sdhci_readl(host, SDHCI_PRESENT_STATE),
  97                 sdhci_readb(host, SDHCI_HOST_CONTROL));
  98         pr_debug(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  99                 sdhci_readb(host, SDHCI_POWER_CONTROL),
 100                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
 101         pr_debug(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
 102                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
 103                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
 104         pr_debug(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
 105                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
 106                 sdhci_readl(host, SDHCI_INT_STATUS));
 107         pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
 108                 sdhci_readl(host, SDHCI_INT_ENABLE),
 109                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
 110         pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
 111                 sdhci_readw(host, SDHCI_ACMD12_ERR),
 112                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
 113         pr_debug(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
 114                 sdhci_readl(host, SDHCI_CAPABILITIES),
 115                 sdhci_readl(host, SDHCI_CAPABILITIES_1));
 116         pr_debug(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
 117                 sdhci_readw(host, SDHCI_COMMAND),
 118                 sdhci_readl(host, SDHCI_MAX_CURRENT));
 119         pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
 120                 sdhci_readw(host, SDHCI_HOST_CONTROL2));
 121
 122         if (host->flags & SDHCI_USE_ADMA)
 123                 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
 124                        readl(host->ioaddr + SDHCI_ADMA_ERROR),
 125                        readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
 126
 127         pr_debug(DRIVER_NAME ": ===========================================\n");
 128 }
 129
 130 /*****************************************************************************\
 131  *                                                                           *
 132  * Low level functions                                                       *
 133  *                                                                           *
 134 \*****************************************************************************/
 135
 136 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
 137 {
 138         u32 present;
 139
 140         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
 141             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
 142                 return;
 143
 144         if (enable) {
 145                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
 146                                       SDHCI_CARD_PRESENT;
 147
 148                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
 149                                        SDHCI_INT_CARD_INSERT;
 150         } else {
 151                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
 152         }
 153
 154         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 155         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 156 }
 157
 158 static void sdhci_enable_card_detection(struct sdhci_host *host)
 159 {
 160         sdhci_set_card_detection(host, true);
 161 }
 162
 163 static void sdhci_disable_card_detection(struct sdhci_host *host)
 164 {
 165         sdhci_set_card_detection(host, false);
 166 }
 167
 168 void sdhci_reset(struct sdhci_host *host, u8 mask)
 169 {
 170         unsigned long timeout;
 171
 172         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 173
 174         if (mask & SDHCI_RESET_ALL) {
 175                 host->clock = 0;
 176                 /* Reset-all turns off SD Bus Power */
 177                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
 178                         sdhci_runtime_pm_bus_off(host);
 179         }
 180
 181         /* Wait max 100 ms */
 182         timeout = 100;
 183
 184         /* hw clears the bit when it's done */
 185         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
 186                 if (timeout == 0) {
 187                         pr_err("%s: Reset 0x%x never completed.\n",
 188                                 mmc_hostname(host->mmc), (int)mask);
 189                         sdhci_dumpregs(host);
 190                         return;
 191                 }
 192                 timeout--;
 193                 mdelay(1);
 194         }
 195 }
 196 EXPORT_SYMBOL_GPL(sdhci_reset);
 197
 198 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
 199 {
 200         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 201                 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
 202                         SDHCI_CARD_PRESENT))
 203                         return;
 204         }
 205
 206         host->ops->reset(host, mask);
 207
 208         if (mask & SDHCI_RESET_ALL) {
 209                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 210                         if (host->ops->enable_dma)
 211                                 host->ops->enable_dma(host);
 212                 }
 213
 214                 /* Resetting the controller clears many */
 215                 host->preset_enabled = false;
 216         }
 217 }
 218
 219 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
 220
 221 static void sdhci_init(struct sdhci_host *host, int soft)
 222 {
 223         if (soft)
 224                 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
 225         else
 226                 sdhci_do_reset(host, SDHCI_RESET_ALL);
 227
 228         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 229                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
 230                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
 231                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
 232                     SDHCI_INT_RESPONSE;
 233
 234         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 235         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 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         /*
 248          * Retuning stuffs are affected by different cards inserted and only
 249          * applicable to UHS-I cards. So reset these fields to their initial
 250          * value when card is removed.
 251          */
 252         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
 253                 host->flags &= ~SDHCI_USING_RETUNING_TIMER;
 254
 255                 del_timer_sync(&host->tuning_timer);
 256                 host->flags &= ~SDHCI_NEEDS_RETUNING;
 257                 host->mmc->max_blk_count =
 258                         (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
 259         }
 260         sdhci_enable_card_detection(host);
 261 }
 262
 263 static void sdhci_activate_led(struct sdhci_host *host)
 264 {
 265         u8 ctrl;
 266
 267         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 268         ctrl |= SDHCI_CTRL_LED;
 269         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 270 }
 271
 272 static void sdhci_deactivate_led(struct sdhci_host *host)
 273 {
 274         u8 ctrl;
 275
 276         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 277         ctrl &= ~SDHCI_CTRL_LED;
 278         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 279 }
 280
 281 #ifdef SDHCI_USE_LEDS_CLASS
 282 static void sdhci_led_control(struct led_classdev *led,
 283         enum led_brightness brightness)
 284 {
 285         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 286         unsigned long flags;
 287
 288         spin_lock_irqsave(&host->lock, flags);
 289
 290         if (host->runtime_suspended)
 291                 goto out;
 292
 293         if (brightness == LED_OFF)
 294                 sdhci_deactivate_led(host);
 295         else
 296                 sdhci_activate_led(host);
 297 out:
 298         spin_unlock_irqrestore(&host->lock, flags);
 299 }
 300 #endif
 301
 302 /*****************************************************************************\
 303  *                                                                           *
 304  * Core functions                                                            *
 305  *                                                                           *
 306 \*****************************************************************************/
 307
 308 static void sdhci_read_block_pio(struct sdhci_host *host)
 309 {
 310         unsigned long flags;
 311         size_t blksize, len, chunk;
 312         u32 uninitialized_var(scratch);
 313         u8 *buf;
 314
 315         DBG("PIO reading\n");
 316
 317         blksize = host->data->blksz;
 318         chunk = 0;
 319
 320         local_irq_save(flags);
 321
 322         while (blksize) {
 323                 if (!sg_miter_next(&host->sg_miter))
 324                         BUG();
 325
 326                 len = min(host->sg_miter.length, blksize);
 327
 328                 blksize -= len;
 329                 host->sg_miter.consumed = len;
 330
 331                 buf = host->sg_miter.addr;
 332
 333                 while (len) {
 334                         if (chunk == 0) {
 335                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
 336                                 chunk = 4;
 337                         }
 338
 339                         *buf = scratch & 0xFF;
 340
 341                         buf++;
 342                         scratch >>= 8;
 343                         chunk--;
 344                         len--;
 345                 }
 346         }
 347
 348         sg_miter_stop(&host->sg_miter);
 349
 350         local_irq_restore(flags);
 351 }
 352
 353 static void sdhci_write_block_pio(struct sdhci_host *host)
 354 {
 355         unsigned long flags;
 356         size_t blksize, len, chunk;
 357         u32 scratch;
 358         u8 *buf;
 359
 360         DBG("PIO writing\n");
 361
 362         blksize = host->data->blksz;
 363         chunk = 0;
 364         scratch = 0;
 365
 366         local_irq_save(flags);
 367
 368         while (blksize) {
 369                 if (!sg_miter_next(&host->sg_miter))
 370                         BUG();
 371
 372                 len = min(host->sg_miter.length, blksize);
 373
 374                 blksize -= len;
 375                 host->sg_miter.consumed = len;
 376
 377                 buf = host->sg_miter.addr;
 378
 379                 while (len) {
 380                         scratch |= (u32)*buf << (chunk * 8);
 381
 382                         buf++;
 383                         chunk++;
 384                         len--;
 385
 386                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 387                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
 388                                 chunk = 0;
 389                                 scratch = 0;
 390                         }
 391                 }
 392         }
 393
 394         sg_miter_stop(&host->sg_miter);
 395
 396         local_irq_restore(flags);
 397 }
 398
 399 static void sdhci_transfer_pio(struct sdhci_host *host)
 400 {
 401         u32 mask;
 402
 403         BUG_ON(!host->data);
 404
 405         if (host->blocks == 0)
 406                 return;
 407
 408         if (host->data->flags & MMC_DATA_READ)
 409                 mask = SDHCI_DATA_AVAILABLE;
 410         else
 411                 mask = SDHCI_SPACE_AVAILABLE;
 412
 413         /*
 414          * Some controllers (JMicron JMB38x) mess up the buffer bits
 415          * for transfers < 4 bytes. As long as it is just one block,
 416          * we can ignore the bits.
 417          */
 418         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
 419                 (host->data->blocks == 1))
 420                 mask = ~0;
 421
 422         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 423                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 424                         udelay(100);
 425
 426                 if (host->data->flags & MMC_DATA_READ)
 427                         sdhci_read_block_pio(host);
 428                 else
 429                         sdhci_write_block_pio(host);
 430
 431                 host->blocks--;
 432                 if (host->blocks == 0)
 433                         break;
 434         }
 435
 436         DBG("PIO transfer complete.\n");
 437 }
 438
 439 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 440 {
 441         local_irq_save(*flags);
 442         return kmap_atomic(sg_page(sg)) + sg->offset;
 443 }
 444
 445 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 446 {
 447         kunmap_atomic(buffer);
 448         local_irq_restore(*flags);
 449 }
 450
 451 static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
 452 {
 453         __le32 *dataddr = (__le32 __force *)(desc + 4);
 454         __le16 *cmdlen = (__le16 __force *)desc;
 455
 456         /* SDHCI specification says ADMA descriptors should be 4 byte
 457          * aligned, so using 16 or 32bit operations should be safe. */
 458
 459         cmdlen[0] = cpu_to_le16(cmd);
 460         cmdlen[1] = cpu_to_le16(len);
 461
 462         dataddr[0] = cpu_to_le32(addr);
 463 }
 464
 465 static int sdhci_adma_table_pre(struct sdhci_host *host,
 466         struct mmc_data *data)
 467 {
 468         int direction;
 469
 470         u8 *desc;
 471         u8 *align;
 472         dma_addr_t addr;
 473         dma_addr_t align_addr;
 474         int len, offset;
 475
 476         struct scatterlist *sg;
 477         int i;
 478         char *buffer;
 479         unsigned long flags;
 480
 481         /*
 482          * The spec does not specify endianness of descriptor table.
 483          * We currently guess that it is LE.
 484          */
 485
 486         if (data->flags & MMC_DATA_READ)
 487                 direction = DMA_FROM_DEVICE;
 488         else
 489                 direction = DMA_TO_DEVICE;
 490
 491         host->align_addr = dma_map_single(mmc_dev(host->mmc),
 492                 host->align_buffer, 128 * 4, direction);
 493         if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
 494                 goto fail;
 495         BUG_ON(host->align_addr & 0x3);
 496
 497         host->sg_count = dma_map_sg(mmc_dev(host->mmc),
 498                 data->sg, data->sg_len, direction);
 499         if (host->sg_count == 0)
 500                 goto unmap_align;
 501
 502         desc = host->adma_desc;
 503         align = host->align_buffer;
 504
 505         align_addr = host->align_addr;
 506
 507         for_each_sg(data->sg, sg, host->sg_count, i) {
 508                 addr = sg_dma_address(sg);
 509                 len = sg_dma_len(sg);
 510
 511                 /*
 512                  * The SDHCI specification states that ADMA
 513                  * addresses must be 32-bit aligned. If they
 514                  * aren't, then we use a bounce buffer for
 515                  * the (up to three) bytes that screw up the
 516                  * alignment.
 517                  */
 518                 offset = (4 - (addr & 0x3)) & 0x3;
 519                 if (offset) {
 520                         if (data->flags & MMC_DATA_WRITE) {
 521                                 buffer = sdhci_kmap_atomic(sg, &flags);
 522                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 523                                 memcpy(align, buffer, offset);
 524                                 sdhci_kunmap_atomic(buffer, &flags);
 525                         }
 526
 527                         /* tran, valid */
 528                         sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
 529
 530                         BUG_ON(offset > 65536);
 531
 532                         align += 4;
 533                         align_addr += 4;
 534
 535                         desc += 8;
 536
 537                         addr += offset;
 538                         len -= offset;
 539                 }
 540
 541                 BUG_ON(len > 65536);
 542
 543                 /* tran, valid */
 544                 sdhci_set_adma_desc(desc, addr, len, 0x21);
 545                 desc += 8;
 546
 547                 /*
 548                  * If this triggers then we have a calculation bug
 549                  * somewhere. :/
 550                  */
 551                 WARN_ON((desc - host->adma_desc) > ADMA_SIZE);
 552         }
 553
 554         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
 555                 /*
 556                 * Mark the last descriptor as the terminating descriptor
 557                 */
 558                 if (desc != host->adma_desc) {
 559                         desc -= 8;
 560                         desc[0] |= 0x2; /* end */
 561                 }
 562         } else {
 563                 /*
 564                 * Add a terminating entry.
 565                 */
 566
 567                 /* nop, end, valid */
 568                 sdhci_set_adma_desc(desc, 0, 0, 0x3);
 569         }
 570
 571         /*
 572          * Resync align buffer as we might have changed it.
 573          */
 574         if (data->flags & MMC_DATA_WRITE) {
 575                 dma_sync_single_for_device(mmc_dev(host->mmc),
 576                         host->align_addr, 128 * 4, direction);
 577         }
 578
 579         return 0;
 580
 581 unmap_align:
 582         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
 583                 128 * 4, direction);
 584 fail:
 585         return -EINVAL;
 586 }
 587
 588 static void sdhci_adma_table_post(struct sdhci_host *host,
 589         struct mmc_data *data)
 590 {
 591         int direction;
 592
 593         struct scatterlist *sg;
 594         int i, size;
 595         u8 *align;
 596         char *buffer;
 597         unsigned long flags;
 598         bool has_unaligned;
 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->align_addr,
 606                 128 * 4, direction);
 607
 608         /* Do a quick scan of the SG list for any unaligned mappings */
 609         has_unaligned = false;
 610         for_each_sg(data->sg, sg, host->sg_count, i)
 611                 if (sg_dma_address(sg) & 3) {
 612                         has_unaligned = true;
 613                         break;
 614                 }
 615
 616         if (has_unaligned && data->flags & MMC_DATA_READ) {
 617                 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 618                         data->sg_len, direction);
 619
 620                 align = host->align_buffer;
 621
 622                 for_each_sg(data->sg, sg, host->sg_count, i) {
 623                         if (sg_dma_address(sg) & 0x3) {
 624                                 size = 4 - (sg_dma_address(sg) & 0x3);
 625
 626                                 buffer = sdhci_kmap_atomic(sg, &flags);
 627                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
 628                                 memcpy(buffer, align, size);
 629                                 sdhci_kunmap_atomic(buffer, &flags);
 630
 631                                 align += 4;
 632                         }
 633                 }
 634         }
 635
 636         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 637                 data->sg_len, direction);
 638 }
 639
 640 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 641 {
 642         u8 count;
 643         struct mmc_data *data = cmd->data;
 644         unsigned target_timeout, current_timeout;
 645
 646         /*
 647          * If the host controller provides us with an incorrect timeout
 648          * value, just skip the check and use 0xE.  The hardware may take
 649          * longer to time out, but that's much better than having a too-short
 650          * timeout value.
 651          */
 652         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
 653                 return 0xE;
 654
 655         /* Unspecified timeout, assume max */
 656         if (!data && !cmd->busy_timeout)
 657                 return 0xE;
 658
 659         /* timeout in us */
 660         if (!data)
 661                 target_timeout = cmd->busy_timeout * 1000;
 662         else {
 663                 target_timeout = data->timeout_ns / 1000;
 664                 if (host->clock)
 665                         target_timeout += data->timeout_clks / host->clock;
 666         }
 667
 668         /*
 669          * Figure out needed cycles.
 670          * We do this in steps in order to fit inside a 32 bit int.
 671          * The first step is the minimum timeout, which will have a
 672          * minimum resolution of 6 bits:
 673          * (1) 2^13*1000 > 2^22,
 674          * (2) host->timeout_clk < 2^16
 675          *     =>
 676          *     (1) / (2) > 2^6
 677          */
 678         count = 0;
 679         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 680         while (current_timeout < target_timeout) {
 681                 count++;
 682                 current_timeout <<= 1;
 683                 if (count >= 0xF)
 684                         break;
 685         }
 686
 687         if (count >= 0xF) {
 688                 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
 689                     mmc_hostname(host->mmc), count, cmd->opcode);
 690                 count = 0xE;
 691         }
 692
 693         return count;
 694 }
 695
 696 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 697 {
 698         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 699         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 700
 701         if (host->flags & SDHCI_REQ_USE_DMA)
 702                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
 703         else
 704                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
 705
 706         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 707         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 708 }
 709
 710 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 711 {
 712         u8 count;
 713         u8 ctrl;
 714         struct mmc_data *data = cmd->data;
 715         int ret;
 716
 717         WARN_ON(host->data);
 718
 719         if (data || (cmd->flags & MMC_RSP_BUSY)) {
 720                 count = sdhci_calc_timeout(host, cmd);
 721                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
 722         }
 723
 724         if (!data)
 725                 return;
 726
 727         /* Sanity checks */
 728         BUG_ON(data->blksz * data->blocks > 524288);
 729         BUG_ON(data->blksz > host->mmc->max_blk_size);
 730         BUG_ON(data->blocks > 65535);
 731
 732         host->data = data;
 733         host->data_early = 0;
 734         host->data->bytes_xfered = 0;
 735
 736         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
 737                 host->flags |= SDHCI_REQ_USE_DMA;
 738
 739         /*
 740          * FIXME: This doesn't account for merging when mapping the
 741          * scatterlist.
 742          */
 743         if (host->flags & SDHCI_REQ_USE_DMA) {
 744                 int broken, i;
 745                 struct scatterlist *sg;
 746
 747                 broken = 0;
 748                 if (host->flags & SDHCI_USE_ADMA) {
 749                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 750                                 broken = 1;
 751                 } else {
 752                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
 753                                 broken = 1;
 754                 }
 755
 756                 if (unlikely(broken)) {
 757                         for_each_sg(data->sg, sg, data->sg_len, i) {
 758                                 if (sg->length & 0x3) {
 759                                         DBG("Reverting to PIO because of "
 760                                                 "transfer size (%d)\n",
 761                                                 sg->length);
 762                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 763                                         break;
 764                                 }
 765                         }
 766                 }
 767         }
 768
 769         /*
 770          * The assumption here being that alignment is the same after
 771          * translation to device address space.
 772          */
 773         if (host->flags & SDHCI_REQ_USE_DMA) {
 774                 int broken, i;
 775                 struct scatterlist *sg;
 776
 777                 broken = 0;
 778                 if (host->flags & SDHCI_USE_ADMA) {
 779                         /*
 780                          * As we use 3 byte chunks to work around
 781                          * alignment problems, we need to check this
 782                          * quirk.
 783                          */
 784                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
 785                                 broken = 1;
 786                 } else {
 787                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
 788                                 broken = 1;
 789                 }
 790
 791                 if (unlikely(broken)) {
 792                         for_each_sg(data->sg, sg, data->sg_len, i) {
 793                                 if (sg->offset & 0x3) {
 794                                         DBG("Reverting to PIO because of "
 795                                                 "bad alignment\n");
 796                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 797                                         break;
 798                                 }
 799                         }
 800                 }
 801         }
 802
 803         if (host->flags & SDHCI_REQ_USE_DMA) {
 804                 if (host->flags & SDHCI_USE_ADMA) {
 805                         ret = sdhci_adma_table_pre(host, data);
 806                         if (ret) {
 807                                 /*
 808                                  * This only happens when someone fed
 809                                  * us an invalid request.
 810                                  */
 811                                 WARN_ON(1);
 812                                 host->flags &= ~SDHCI_REQ_USE_DMA;
 813                         } else {
 814                                 sdhci_writel(host, host->adma_addr,
 815                                         SDHCI_ADMA_ADDRESS);
 816                         }
 817                 } else {
 818                         int sg_cnt;
 819
 820                         sg_cnt = dma_map_sg(mmc_dev(host->mmc),
 821                                         data->sg, data->sg_len,
 822                                         (data->flags & MMC_DATA_READ) ?
 823                                                 DMA_FROM_DEVICE :
 824                                                 DMA_TO_DEVICE);
 825                         if (sg_cnt == 0) {
 826                                 /*
 827                                  * This only happens when someone fed
 828                                  * us an invalid request.
 829                                  */
 830                                 WARN_ON(1);
 831                                 host->flags &= ~SDHCI_REQ_USE_DMA;
 832                         } else {
 833                                 WARN_ON(sg_cnt != 1);
 834                                 sdhci_writel(host, sg_dma_address(data->sg),
 835                                         SDHCI_DMA_ADDRESS);
 836                         }
 837                 }
 838         }
 839
 840         /*
 841          * Always adjust the DMA selection as some controllers
 842          * (e.g. JMicron) can't do PIO properly when the selection
 843          * is ADMA.
 844          */
 845         if (host->version >= SDHCI_SPEC_200) {
 846                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 847                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
 848                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
 849                         (host->flags & SDHCI_USE_ADMA))
 850                         ctrl |= SDHCI_CTRL_ADMA32;
 851                 else
 852                         ctrl |= SDHCI_CTRL_SDMA;
 853                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 854         }
 855
 856         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
 857                 int flags;
 858
 859                 flags = SG_MITER_ATOMIC;
 860                 if (host->data->flags & MMC_DATA_READ)
 861                         flags |= SG_MITER_TO_SG;
 862                 else
 863                         flags |= SG_MITER_FROM_SG;
 864                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
 865                 host->blocks = data->blocks;
 866         }
 867
 868         sdhci_set_transfer_irqs(host);
 869
 870         /* Set the DMA boundary value and block size */
 871         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 872                 data->blksz), SDHCI_BLOCK_SIZE);
 873         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 874 }
 875
 876 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 877         struct mmc_command *cmd)
 878 {
 879         u16 mode;
 880         struct mmc_data *data = cmd->data;
 881
 882         if (data == NULL) {
 883                 /* clear Auto CMD settings for no data CMDs */
 884                 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
 885                 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
 886                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
 887                 return;
 888         }
 889
 890         WARN_ON(!host->data);
 891
 892         mode = SDHCI_TRNS_BLK_CNT_EN;
 893         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
 894                 mode |= SDHCI_TRNS_MULTI;
 895                 /*
 896                  * If we are sending CMD23, CMD12 never gets sent
 897                  * on successful completion (so no Auto-CMD12).
 898                  */
 899                 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
 900                         mode |= SDHCI_TRNS_AUTO_CMD12;
 901                 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
 902                         mode |= SDHCI_TRNS_AUTO_CMD23;
 903                         sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
 904                 }
 905         }
 906
 907         if (data->flags & MMC_DATA_READ)
 908                 mode |= SDHCI_TRNS_READ;
 909         if (host->flags & SDHCI_REQ_USE_DMA)
 910                 mode |= SDHCI_TRNS_DMA;
 911
 912         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 913 }
 914
 915 static void sdhci_finish_data(struct sdhci_host *host)
 916 {
 917         struct mmc_data *data;
 918
 919         BUG_ON(!host->data);
 920
 921         data = host->data;
 922         host->data = NULL;
 923
 924         if (host->flags & SDHCI_REQ_USE_DMA) {
 925                 if (host->flags & SDHCI_USE_ADMA)
 926                         sdhci_adma_table_post(host, data);
 927                 else {
 928                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
 929                                 data->sg_len, (data->flags & MMC_DATA_READ) ?
 930                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
 931                 }
 932         }
 933
 934         /*
 935          * The specification states that the block count register must
 936          * be updated, but it does not specify at what point in the
 937          * data flow. That makes the register entirely useless to read
 938          * back so we have to assume that nothing made it to the card
 939          * in the event of an error.
 940          */
 941         if (data->error)
 942                 data->bytes_xfered = 0;
 943         else
 944                 data->bytes_xfered = data->blksz * data->blocks;
 945
 946         /*
 947          * Need to send CMD12 if -
 948          * a) open-ended multiblock transfer (no CMD23)
 949          * b) error in multiblock transfer
 950          */
 951         if (data->stop &&
 952             (data->error ||
 953              !host->mrq->sbc)) {
 954
 955                 /*
 956                  * The controller needs a reset of internal state machines
 957                  * upon error conditions.
 958                  */
 959                 if (data->error) {
 960                         sdhci_do_reset(host, SDHCI_RESET_CMD);
 961                         sdhci_do_reset(host, SDHCI_RESET_DATA);
 962                 }
 963
 964                 sdhci_send_command(host, data->stop);
 965         } else
 966                 tasklet_schedule(&host->finish_tasklet);
 967 }
 968
 969 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 970 {
 971         int flags;
 972         u32 mask;
 973         unsigned long timeout;
 974
 975         WARN_ON(host->cmd);
 976
 977         /* Wait max 10 ms */
 978         timeout = 10;
 979
 980         mask = SDHCI_CMD_INHIBIT;
 981         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
 982                 mask |= SDHCI_DATA_INHIBIT;
 983
 984         /* We shouldn't wait for data inihibit for stop commands, even
 985            though they might use busy signaling */
 986         if (host->mrq->data && (cmd == host->mrq->data->stop))
 987                 mask &= ~SDHCI_DATA_INHIBIT;
 988
 989         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 990                 if (timeout == 0) {
 991                         pr_err("%s: Controller never released "
 992                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
 993                         sdhci_dumpregs(host);
 994                         cmd->error = -EIO;
 995                         tasklet_schedule(&host->finish_tasklet);
 996                         return;
 997                 }
 998                 timeout--;
 999                 mdelay(1);
1000         }
1001
1002         timeout = jiffies;
1003         if (!cmd->data && cmd->busy_timeout > 9000)
1004                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1005         else
1006                 timeout += 10 * HZ;
1007         mod_timer(&host->timer, timeout);
1008
1009         host->cmd = cmd;
1010
1011         sdhci_prepare_data(host, cmd);
1012
1013         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1014
1015         sdhci_set_transfer_mode(host, cmd);
1016
1017         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1018                 pr_err("%s: Unsupported response type!\n",
1019                         mmc_hostname(host->mmc));
1020                 cmd->error = -EINVAL;
1021                 tasklet_schedule(&host->finish_tasklet);
1022                 return;
1023         }
1024
1025         if (!(cmd->flags & MMC_RSP_PRESENT))
1026                 flags = SDHCI_CMD_RESP_NONE;
1027         else if (cmd->flags & MMC_RSP_136)
1028                 flags = SDHCI_CMD_RESP_LONG;
1029         else if (cmd->flags & MMC_RSP_BUSY)
1030                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1031         else
1032                 flags = SDHCI_CMD_RESP_SHORT;
1033
1034         if (cmd->flags & MMC_RSP_CRC)
1035                 flags |= SDHCI_CMD_CRC;
1036         if (cmd->flags & MMC_RSP_OPCODE)
1037                 flags |= SDHCI_CMD_INDEX;
1038
1039         /* CMD19 is special in that the Data Present Select should be set */
1040         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1041             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1042                 flags |= SDHCI_CMD_DATA;
1043
1044         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1045 }
1046 EXPORT_SYMBOL_GPL(sdhci_send_command);
1047
1048 static void sdhci_finish_command(struct sdhci_host *host)
1049 {
1050         int i;
1051
1052         BUG_ON(host->cmd == NULL);
1053
1054         if (host->cmd->flags & MMC_RSP_PRESENT) {
1055                 if (host->cmd->flags & MMC_RSP_136) {
1056                         /* CRC is stripped so we need to do some shifting. */
1057                         for (i = 0;i < 4;i++) {
1058                                 host->cmd->resp[i] = sdhci_readl(host,
1059                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1060                                 if (i != 3)
1061                                         host->cmd->resp[i] |=
1062                                                 sdhci_readb(host,
1063                                                 SDHCI_RESPONSE + (3-i)*4-1);
1064                         }
1065                 } else {
1066                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1067                 }
1068         }
1069
1070         host->cmd->error = 0;
1071
1072         /* Finished CMD23, now send actual command. */
1073         if (host->cmd == host->mrq->sbc) {
1074                 host->cmd = NULL;
1075                 sdhci_send_command(host, host->mrq->cmd);
1076         } else {
1077
1078                 /* Processed actual command. */
1079                 if (host->data && host->data_early)
1080                         sdhci_finish_data(host);
1081
1082                 if (!host->cmd->data)
1083                         tasklet_schedule(&host->finish_tasklet);
1084
1085                 host->cmd = NULL;
1086         }
1087 }
1088
1089 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1090 {
1091         u16 preset = 0;
1092
1093         switch (host->timing) {
1094         case MMC_TIMING_UHS_SDR12:
1095                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1096                 break;
1097         case MMC_TIMING_UHS_SDR25:
1098                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1099                 break;
1100         case MMC_TIMING_UHS_SDR50:
1101                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1102                 break;
1103         case MMC_TIMING_UHS_SDR104:
1104         case MMC_TIMING_MMC_HS200:
1105                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1106                 break;
1107         case MMC_TIMING_UHS_DDR50:
1108                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1109                 break;
1110         default:
1111                 pr_warn("%s: Invalid UHS-I mode selected\n",
1112                         mmc_hostname(host->mmc));
1113                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1114                 break;
1115         }
1116         return preset;
1117 }
1118
1119 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1120 {
1121         int div = 0; /* Initialized for compiler warning */
1122         int real_div = div, clk_mul = 1;
1123         u16 clk = 0;
1124         unsigned long timeout;
1125
1126         host->mmc->actual_clock = 0;
1127
1128         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1129
1130         if (clock == 0)
1131                 return;
1132
1133         if (host->version >= SDHCI_SPEC_300) {
1134                 if (host->preset_enabled) {
1135                         u16 pre_val;
1136
1137                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1138                         pre_val = sdhci_get_preset_value(host);
1139                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1140                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1141                         if (host->clk_mul &&
1142                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1143                                 clk = SDHCI_PROG_CLOCK_MODE;
1144                                 real_div = div + 1;
1145                                 clk_mul = host->clk_mul;
1146                         } else {
1147                                 real_div = max_t(int, 1, div << 1);
1148                         }
1149                         goto clock_set;
1150                 }
1151
1152                 /*
1153                  * Check if the Host Controller supports Programmable Clock
1154                  * Mode.
1155                  */
1156                 if (host->clk_mul) {
1157                         for (div = 1; div <= 1024; div++) {
1158                                 if ((host->max_clk * host->clk_mul / div)
1159                                         <= clock)
1160                                         break;
1161                         }
1162                         /*
1163                          * Set Programmable Clock Mode in the Clock
1164                          * Control register.
1165                          */
1166                         clk = SDHCI_PROG_CLOCK_MODE;
1167                         real_div = div;
1168                         clk_mul = host->clk_mul;
1169                         div--;
1170                 } else {
1171                         /* Version 3.00 divisors must be a multiple of 2. */
1172                         if (host->max_clk <= clock)
1173                                 div = 1;
1174                         else {
1175                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1176                                      div += 2) {
1177                                         if ((host->max_clk / div) <= clock)
1178                                                 break;
1179                                 }
1180                         }
1181                         real_div = div;
1182                         div >>= 1;
1183                 }
1184         } else {
1185                 /* Version 2.00 divisors must be a power of 2. */
1186                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1187                         if ((host->max_clk / div) <= clock)
1188                                 break;
1189                 }
1190                 real_div = div;
1191                 div >>= 1;
1192         }
1193
1194 clock_set:
1195         if (real_div)
1196                 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1197
1198         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1199         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1200                 << SDHCI_DIVIDER_HI_SHIFT;
1201         clk |= SDHCI_CLOCK_INT_EN;
1202         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1203
1204         /* Wait max 20 ms */
1205         timeout = 20;
1206         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1207                 & SDHCI_CLOCK_INT_STABLE)) {
1208                 if (timeout == 0) {
1209                         pr_err("%s: Internal clock never "
1210                                 "stabilised.\n", mmc_hostname(host->mmc));
1211                         sdhci_dumpregs(host);
1212                         return;
1213                 }
1214                 timeout--;
1215                 mdelay(1);
1216         }
1217
1218         clk |= SDHCI_CLOCK_CARD_EN;
1219         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1220 }
1221 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1222
1223 static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1224                             unsigned short vdd)
1225 {
1226         u8 pwr = 0;
1227
1228         if (mode != MMC_POWER_OFF) {
1229                 switch (1 << vdd) {
1230                 case MMC_VDD_165_195:
1231                         pwr = SDHCI_POWER_180;
1232                         break;
1233                 case MMC_VDD_29_30:
1234                 case MMC_VDD_30_31:
1235                         pwr = SDHCI_POWER_300;
1236                         break;
1237                 case MMC_VDD_32_33:
1238                 case MMC_VDD_33_34:
1239                         pwr = SDHCI_POWER_330;
1240                         break;
1241                 default:
1242                         BUG();
1243                 }
1244         }
1245
1246         if (host->pwr == pwr)
1247                 return;
1248
1249         host->pwr = pwr;
1250
1251         if (pwr == 0) {
1252                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1253                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1254                         sdhci_runtime_pm_bus_off(host);
1255                 vdd = 0;
1256         } else {
1257                 /*
1258                  * Spec says that we should clear the power reg before setting
1259                  * a new value. Some controllers don't seem to like this though.
1260                  */
1261                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1262                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1263
1264                 /*
1265                  * At least the Marvell CaFe chip gets confused if we set the
1266                  * voltage and set turn on power at the same time, so set the
1267                  * voltage first.
1268                  */
1269                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1270                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1271
1272                 pwr |= SDHCI_POWER_ON;
1273
1274                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1275
1276                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1277                         sdhci_runtime_pm_bus_on(host);
1278
1279                 /*
1280                  * Some controllers need an extra 10ms delay of 10ms before
1281                  * they can apply clock after applying power
1282                  */
1283                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1284                         mdelay(10);
1285         }
1286
1287         if (host->vmmc) {
1288                 spin_unlock_irq(&host->lock);
1289                 mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd);
1290                 spin_lock_irq(&host->lock);
1291         }
1292 }
1293
1294 /*****************************************************************************\
1295  *                                                                           *
1296  * MMC callbacks                                                             *
1297  *                                                                           *
1298 \*****************************************************************************/
1299
1300 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1301 {
1302         struct sdhci_host *host;
1303         int present;
1304         unsigned long flags;
1305         u32 tuning_opcode;
1306
1307         host = mmc_priv(mmc);
1308
1309         sdhci_runtime_pm_get(host);
1310
1311         spin_lock_irqsave(&host->lock, flags);
1312
1313         WARN_ON(host->mrq != NULL);
1314
1315 #ifndef SDHCI_USE_LEDS_CLASS
1316         sdhci_activate_led(host);
1317 #endif
1318
1319         /*
1320          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1321          * requests if Auto-CMD12 is enabled.
1322          */
1323         if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1324                 if (mrq->stop) {
1325                         mrq->data->stop = NULL;
1326                         mrq->stop = NULL;
1327                 }
1328         }
1329
1330         host->mrq = mrq;
1331
1332         /*
1333          * Firstly check card presence from cd-gpio.  The return could
1334          * be one of the following possibilities:
1335          *     negative: cd-gpio is not available
1336          *     zero: cd-gpio is used, and card is removed
1337          *     one: cd-gpio is used, and card is present
1338          */
1339         present = mmc_gpio_get_cd(host->mmc);
1340         if (present < 0) {
1341                 /* If polling, assume that the card is always present. */
1342                 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1343                         present = 1;
1344                 else
1345                         present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1346                                         SDHCI_CARD_PRESENT;
1347         }
1348
1349         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1350                 host->mrq->cmd->error = -ENOMEDIUM;
1351                 tasklet_schedule(&host->finish_tasklet);
1352         } else {
1353                 u32 present_state;
1354
1355                 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1356                 /*
1357                  * Check if the re-tuning timer has already expired and there
1358                  * is no on-going data transfer. If so, we need to execute
1359                  * tuning procedure before sending command.
1360                  */
1361                 if ((host->flags & SDHCI_NEEDS_RETUNING) &&
1362                     !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
1363                         if (mmc->card) {
1364                                 /* eMMC uses cmd21 but sd and sdio use cmd19 */
1365                                 tuning_opcode =
1366                                         mmc->card->type == MMC_TYPE_MMC ?
1367                                         MMC_SEND_TUNING_BLOCK_HS200 :
1368                                         MMC_SEND_TUNING_BLOCK;
1369
1370                                 /* Here we need to set the host->mrq to NULL,
1371                                  * in case the pending finish_tasklet
1372                                  * finishes it incorrectly.
1373                                  */
1374                                 host->mrq = NULL;
1375
1376                                 spin_unlock_irqrestore(&host->lock, flags);
1377                                 sdhci_execute_tuning(mmc, tuning_opcode);
1378                                 spin_lock_irqsave(&host->lock, flags);
1379
1380                                 /* Restore original mmc_request structure */
1381                                 host->mrq = mrq;
1382                         }
1383                 }
1384
1385                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1386                         sdhci_send_command(host, mrq->sbc);
1387                 else
1388                         sdhci_send_command(host, mrq->cmd);
1389         }
1390
1391         mmiowb();
1392         spin_unlock_irqrestore(&host->lock, flags);
1393 }
1394
1395 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1396 {
1397         u8 ctrl;
1398
1399         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1400         if (width == MMC_BUS_WIDTH_8) {
1401                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1402                 if (host->version >= SDHCI_SPEC_300)
1403                         ctrl |= SDHCI_CTRL_8BITBUS;
1404         } else {
1405                 if (host->version >= SDHCI_SPEC_300)
1406                         ctrl &= ~SDHCI_CTRL_8BITBUS;
1407                 if (width == MMC_BUS_WIDTH_4)
1408                         ctrl |= SDHCI_CTRL_4BITBUS;
1409                 else
1410                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1411         }
1412         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1413 }
1414 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1415
1416 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1417 {
1418         u16 ctrl_2;
1419
1420         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1421         /* Select Bus Speed Mode for host */
1422         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1423         if ((timing == MMC_TIMING_MMC_HS200) ||
1424             (timing == MMC_TIMING_UHS_SDR104))
1425                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1426         else if (timing == MMC_TIMING_UHS_SDR12)
1427                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1428         else if (timing == MMC_TIMING_UHS_SDR25)
1429                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1430         else if (timing == MMC_TIMING_UHS_SDR50)
1431                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1432         else if ((timing == MMC_TIMING_UHS_DDR50) ||
1433                  (timing == MMC_TIMING_MMC_DDR52))
1434                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1435         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1436 }
1437 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1438
1439 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1440 {
1441         unsigned long flags;
1442         u8 ctrl;
1443
1444         spin_lock_irqsave(&host->lock, flags);
1445
1446         if (host->flags & SDHCI_DEVICE_DEAD) {
1447                 spin_unlock_irqrestore(&host->lock, flags);
1448                 if (host->vmmc && ios->power_mode == MMC_POWER_OFF)
1449                         mmc_regulator_set_ocr(host->mmc, host->vmmc, 0);
1450                 return;
1451         }
1452
1453         /*
1454          * Reset the chip on each power off.
1455          * Should clear out any weird states.
1456          */
1457         if (ios->power_mode == MMC_POWER_OFF) {
1458                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1459                 sdhci_reinit(host);
1460         }
1461
1462         if (host->version >= SDHCI_SPEC_300 &&
1463                 (ios->power_mode == MMC_POWER_UP) &&
1464                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1465                 sdhci_enable_preset_value(host, false);
1466
1467         if (!ios->clock || ios->clock != host->clock) {
1468                 host->ops->set_clock(host, ios->clock);
1469                 host->clock = ios->clock;
1470         }
1471
1472         sdhci_set_power(host, ios->power_mode, ios->vdd);
1473
1474         if (host->ops->platform_send_init_74_clocks)
1475                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1476
1477         host->ops->set_bus_width(host, ios->bus_width);
1478
1479         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1480
1481         if ((ios->timing == MMC_TIMING_SD_HS ||
1482              ios->timing == MMC_TIMING_MMC_HS)
1483             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1484                 ctrl |= SDHCI_CTRL_HISPD;
1485         else
1486                 ctrl &= ~SDHCI_CTRL_HISPD;
1487
1488         if (host->version >= SDHCI_SPEC_300) {
1489                 u16 clk, ctrl_2;
1490
1491                 /* In case of UHS-I modes, set High Speed Enable */
1492                 if ((ios->timing == MMC_TIMING_MMC_HS200) ||
1493                     (ios->timing == MMC_TIMING_MMC_DDR52) ||
1494                     (ios->timing == MMC_TIMING_UHS_SDR50) ||
1495                     (ios->timing == MMC_TIMING_UHS_SDR104) ||
1496                     (ios->timing == MMC_TIMING_UHS_DDR50) ||
1497                     (ios->timing == MMC_TIMING_UHS_SDR25))
1498                         ctrl |= SDHCI_CTRL_HISPD;
1499
1500                 if (!host->preset_enabled) {
1501                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1502                         /*
1503                          * We only need to set Driver Strength if the
1504                          * preset value enable is not set.
1505                          */
1506                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1507                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1508                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1509                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1510                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1511                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1512
1513                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1514                 } else {
1515                         /*
1516                          * According to SDHC Spec v3.00, if the Preset Value
1517                          * Enable in the Host Control 2 register is set, we
1518                          * need to reset SD Clock Enable before changing High
1519                          * Speed Enable to avoid generating clock gliches.
1520                          */
1521
1522                         /* Reset SD Clock Enable */
1523                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1524                         clk &= ~SDHCI_CLOCK_CARD_EN;
1525                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1526
1527                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1528
1529                         /* Re-enable SD Clock */
1530                         host->ops->set_clock(host, host->clock);
1531                 }
1532
1533
1534                 /* Reset SD Clock Enable */
1535                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1536                 clk &= ~SDHCI_CLOCK_CARD_EN;
1537                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1538
1539                 host->ops->set_uhs_signaling(host, ios->timing);
1540                 host->timing = ios->timing;
1541
1542                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1543                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1544                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
1545                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
1546                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
1547                                  (ios->timing == MMC_TIMING_UHS_DDR50))) {
1548                         u16 preset;
1549
1550                         sdhci_enable_preset_value(host, true);
1551                         preset = sdhci_get_preset_value(host);
1552                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1553                                 >> SDHCI_PRESET_DRV_SHIFT;
1554                 }
1555
1556                 /* Re-enable SD Clock */
1557                 host->ops->set_clock(host, host->clock);
1558         } else
1559                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1560
1561         /*
1562          * Some (ENE) controllers go apeshit on some ios operation,
1563          * signalling timeout and CRC errors even on CMD0. Resetting
1564          * it on each ios seems to solve the problem.
1565          */
1566         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1567                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1568
1569         mmiowb();
1570         spin_unlock_irqrestore(&host->lock, flags);
1571 }
1572
1573 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1574 {
1575         struct sdhci_host *host = mmc_priv(mmc);
1576
1577         sdhci_runtime_pm_get(host);
1578         sdhci_do_set_ios(host, ios);
1579         sdhci_runtime_pm_put(host);
1580 }
1581
1582 static int sdhci_do_get_cd(struct sdhci_host *host)
1583 {
1584         int gpio_cd = mmc_gpio_get_cd(host->mmc);
1585
1586         if (host->flags & SDHCI_DEVICE_DEAD)
1587                 return 0;
1588
1589         /* If polling/nonremovable, assume that the card is always present. */
1590         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
1591             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
1592                 return 1;
1593
1594         /* Try slot gpio detect */
1595         if (!IS_ERR_VALUE(gpio_cd))
1596                 return !!gpio_cd;
1597
1598         /* Host native card detect */
1599         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1600 }
1601
1602 static int sdhci_get_cd(struct mmc_host *mmc)
1603 {
1604         struct sdhci_host *host = mmc_priv(mmc);
1605         int ret;
1606
1607         sdhci_runtime_pm_get(host);
1608         ret = sdhci_do_get_cd(host);
1609         sdhci_runtime_pm_put(host);
1610         return ret;
1611 }
1612
1613 static int sdhci_check_ro(struct sdhci_host *host)
1614 {
1615         unsigned long flags;
1616         int is_readonly;
1617
1618         spin_lock_irqsave(&host->lock, flags);
1619
1620         if (host->flags & SDHCI_DEVICE_DEAD)
1621                 is_readonly = 0;
1622         else if (host->ops->get_ro)
1623                 is_readonly = host->ops->get_ro(host);
1624         else
1625                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1626                                 & SDHCI_WRITE_PROTECT);
1627
1628         spin_unlock_irqrestore(&host->lock, flags);
1629
1630         /* This quirk needs to be replaced by a callback-function later */
1631         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1632                 !is_readonly : is_readonly;
1633 }
1634
1635 #define SAMPLE_COUNT    5
1636
1637 static int sdhci_do_get_ro(struct sdhci_host *host)
1638 {
1639         int i, ro_count;
1640
1641         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1642                 return sdhci_check_ro(host);
1643
1644         ro_count = 0;
1645         for (i = 0; i < SAMPLE_COUNT; i++) {
1646                 if (sdhci_check_ro(host)) {
1647                         if (++ro_count > SAMPLE_COUNT / 2)
1648                                 return 1;
1649                 }
1650                 msleep(30);
1651         }
1652         return 0;
1653 }
1654
1655 static void sdhci_hw_reset(struct mmc_host *mmc)
1656 {
1657         struct sdhci_host *host = mmc_priv(mmc);
1658
1659         if (host->ops && host->ops->hw_reset)
1660                 host->ops->hw_reset(host);
1661 }
1662
1663 static int sdhci_get_ro(struct mmc_host *mmc)
1664 {
1665         struct sdhci_host *host = mmc_priv(mmc);
1666         int ret;
1667
1668         sdhci_runtime_pm_get(host);
1669         ret = sdhci_do_get_ro(host);
1670         sdhci_runtime_pm_put(host);
1671         return ret;
1672 }
1673
1674 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1675 {
1676         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1677                 if (enable)
1678                         host->ier |= SDHCI_INT_CARD_INT;
1679                 else
1680                         host->ier &= ~SDHCI_INT_CARD_INT;
1681
1682                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1683                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1684                 mmiowb();
1685         }
1686 }
1687
1688 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1689 {
1690         struct sdhci_host *host = mmc_priv(mmc);
1691         unsigned long flags;
1692
1693         sdhci_runtime_pm_get(host);
1694
1695         spin_lock_irqsave(&host->lock, flags);
1696         if (enable)
1697                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1698         else
1699                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1700
1701         sdhci_enable_sdio_irq_nolock(host, enable);
1702         spin_unlock_irqrestore(&host->lock, flags);
1703
1704         sdhci_runtime_pm_put(host);
1705 }
1706
1707 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1708                                                 struct mmc_ios *ios)
1709 {
1710         u16 ctrl;
1711         int ret;
1712
1713         /*
1714          * Signal Voltage Switching is only applicable for Host Controllers
1715          * v3.00 and above.
1716          */
1717         if (host->version < SDHCI_SPEC_300)
1718                 return 0;
1719
1720         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1721
1722         switch (ios->signal_voltage) {
1723         case MMC_SIGNAL_VOLTAGE_330:
1724                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1725                 ctrl &= ~SDHCI_CTRL_VDD_180;
1726                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1727
1728                 if (host->vqmmc) {
1729                         ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
1730                         if (ret) {
1731                                 pr_warning("%s: Switching to 3.3V signalling voltage "
1732                                                 " failed\n", mmc_hostname(host->mmc));
1733                                 return -EIO;
1734                         }
1735                 }
1736                 /* Wait for 5ms */
1737                 usleep_range(5000, 5500);
1738
1739                 /* 3.3V regulator output should be stable within 5 ms */
1740                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1741                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1742                         return 0;
1743
1744                 pr_warning("%s: 3.3V regulator output did not became stable\n",
1745                                 mmc_hostname(host->mmc));
1746
1747                 return -EAGAIN;
1748         case MMC_SIGNAL_VOLTAGE_180:
1749                 if (host->vqmmc) {
1750                         ret = regulator_set_voltage(host->vqmmc,
1751                                         1700000, 1950000);
1752                         if (ret) {
1753                                 pr_warning("%s: Switching to 1.8V signalling voltage "
1754                                                 " failed\n", mmc_hostname(host->mmc));
1755                                 return -EIO;
1756                         }
1757                 }
1758
1759                 /*
1760                  * Enable 1.8V Signal Enable in the Host Control2
1761                  * register
1762                  */
1763                 ctrl |= SDHCI_CTRL_VDD_180;
1764                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1765
1766                 /* Wait for 5ms */
1767                 usleep_range(5000, 5500);
1768
1769                 /* 1.8V regulator output should be stable within 5 ms */
1770                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1771                 if (ctrl & SDHCI_CTRL_VDD_180)
1772                         return 0;
1773
1774                 pr_warning("%s: 1.8V regulator output did not became stable\n",
1775                                 mmc_hostname(host->mmc));
1776
1777                 return -EAGAIN;
1778         case MMC_SIGNAL_VOLTAGE_120:
1779                 if (host->vqmmc) {
1780                         ret = regulator_set_voltage(host->vqmmc, 1100000, 1300000);
1781                         if (ret) {
1782                                 pr_warning("%s: Switching to 1.2V signalling voltage "
1783                                                 " failed\n", mmc_hostname(host->mmc));
1784                                 return -EIO;
1785                         }
1786                 }
1787                 return 0;
1788         default:
1789                 /* No signal voltage switch required */
1790                 return 0;
1791         }
1792 }
1793
1794 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1795         struct mmc_ios *ios)
1796 {
1797         struct sdhci_host *host = mmc_priv(mmc);
1798         int err;
1799
1800         if (host->version < SDHCI_SPEC_300)
1801                 return 0;
1802         sdhci_runtime_pm_get(host);
1803         err = sdhci_do_start_signal_voltage_switch(host, ios);
1804         sdhci_runtime_pm_put(host);
1805         return err;
1806 }
1807
1808 static int sdhci_card_busy(struct mmc_host *mmc)
1809 {
1810         struct sdhci_host *host = mmc_priv(mmc);
1811         u32 present_state;
1812
1813         sdhci_runtime_pm_get(host);
1814         /* Check whether DAT[3:0] is 0000 */
1815         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1816         sdhci_runtime_pm_put(host);
1817
1818         return !(present_state & SDHCI_DATA_LVL_MASK);
1819 }
1820
1821 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1822 {
1823         struct sdhci_host *host = mmc_priv(mmc);
1824         u16 ctrl;
1825         int tuning_loop_counter = MAX_TUNING_LOOP;
1826         unsigned long timeout;
1827         int err = 0;
1828         unsigned long flags;
1829
1830         sdhci_runtime_pm_get(host);
1831         spin_lock_irqsave(&host->lock, flags);
1832
1833         /*
1834          * The Host Controller needs tuning only in case of SDR104 mode
1835          * and for SDR50 mode when Use Tuning for SDR50 is set in the
1836          * Capabilities register.
1837          * If the Host Controller supports the HS200 mode then the
1838          * tuning function has to be executed.
1839          */
1840         switch (host->timing) {
1841         case MMC_TIMING_MMC_HS200:
1842         case MMC_TIMING_UHS_SDR104:
1843                 break;
1844
1845         case MMC_TIMING_UHS_SDR50:
1846                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1847                     host->flags & SDHCI_SDR104_NEEDS_TUNING)
1848                         break;
1849                 /* FALLTHROUGH */
1850
1851         default:
1852                 spin_unlock_irqrestore(&host->lock, flags);
1853                 sdhci_runtime_pm_put(host);
1854                 return 0;
1855         }
1856
1857         if (host->ops->platform_execute_tuning) {
1858                 spin_unlock_irqrestore(&host->lock, flags);
1859                 err = host->ops->platform_execute_tuning(host, opcode);
1860                 sdhci_runtime_pm_put(host);
1861                 return err;
1862         }
1863
1864         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1865         ctrl |= SDHCI_CTRL_EXEC_TUNING;
1866         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1867
1868         /*
1869          * As per the Host Controller spec v3.00, tuning command
1870          * generates Buffer Read Ready interrupt, so enable that.
1871          *
1872          * Note: The spec clearly says that when tuning sequence
1873          * is being performed, the controller does not generate
1874          * interrupts other than Buffer Read Ready interrupt. But
1875          * to make sure we don't hit a controller bug, we _only_
1876          * enable Buffer Read Ready interrupt here.
1877          */
1878         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1879         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1880
1881         /*
1882          * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1883          * of loops reaches 40 times or a timeout of 150ms occurs.
1884          */
1885         timeout = 150;
1886         do {
1887                 struct mmc_command cmd = {0};
1888                 struct mmc_request mrq = {NULL};
1889
1890                 if (!tuning_loop_counter && !timeout)
1891                         break;
1892
1893                 cmd.opcode = opcode;
1894                 cmd.arg = 0;
1895                 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1896                 cmd.retries = 0;
1897                 cmd.data = NULL;
1898                 cmd.error = 0;
1899
1900                 mrq.cmd = &cmd;
1901                 host->mrq = &mrq;
1902
1903                 /*
1904                  * In response to CMD19, the card sends 64 bytes of tuning
1905                  * block to the Host Controller. So we set the block size
1906                  * to 64 here.
1907                  */
1908                 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1909                         if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1910                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1911                                              SDHCI_BLOCK_SIZE);
1912                         else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1913                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1914                                              SDHCI_BLOCK_SIZE);
1915                 } else {
1916                         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1917                                      SDHCI_BLOCK_SIZE);
1918                 }
1919
1920                 /*
1921                  * The tuning block is sent by the card to the host controller.
1922                  * So we set the TRNS_READ bit in the Transfer Mode register.
1923                  * This also takes care of setting DMA Enable and Multi Block
1924                  * Select in the same register to 0.
1925                  */
1926                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1927
1928                 sdhci_send_command(host, &cmd);
1929
1930                 host->cmd = NULL;
1931                 host->mrq = NULL;
1932
1933                 spin_unlock_irqrestore(&host->lock, flags);
1934                 /* Wait for Buffer Read Ready interrupt */
1935                 wait_event_interruptible_timeout(host->buf_ready_int,
1936                                         (host->tuning_done == 1),
1937                                         msecs_to_jiffies(50));
1938                 spin_lock_irqsave(&host->lock, flags);
1939
1940                 if (!host->tuning_done) {
1941                         pr_info(DRIVER_NAME ": Timeout waiting for "
1942                                 "Buffer Read Ready interrupt during tuning "
1943                                 "procedure, falling back to fixed sampling "
1944                                 "clock\n");
1945                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1946                         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1947                         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1948                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1949
1950                         err = -EIO;
1951                         goto out;
1952                 }
1953
1954                 host->tuning_done = 0;
1955
1956                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1957                 tuning_loop_counter--;
1958                 timeout--;
1959
1960                 /* eMMC spec does not require a delay between tuning cycles */
1961                 if (opcode == MMC_SEND_TUNING_BLOCK)
1962                         mdelay(1);
1963         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1964
1965         /*
1966          * The Host Driver has exhausted the maximum number of loops allowed,
1967          * so use fixed sampling frequency.
1968          */
1969         if (!tuning_loop_counter || !timeout) {
1970                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1971                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1972                 err = -EIO;
1973         } else {
1974                 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
1975                         pr_info(DRIVER_NAME ": Tuning procedure"
1976                                 " failed, falling back to fixed sampling"
1977                                 " clock\n");
1978                         err = -EIO;
1979                 }
1980         }
1981
1982 out:
1983         /*
1984          * If this is the very first time we are here, we start the retuning
1985          * timer. Since only during the first time, SDHCI_NEEDS_RETUNING
1986          * flag won't be set, we check this condition before actually starting
1987          * the timer.
1988          */
1989         if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
1990             (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
1991                 host->flags |= SDHCI_USING_RETUNING_TIMER;
1992                 mod_timer(&host->tuning_timer, jiffies +
1993                         host->tuning_count * HZ);
1994                 /* Tuning mode 1 limits the maximum data length to 4MB */
1995                 mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
1996         } else if (host->flags & SDHCI_USING_RETUNING_TIMER) {
1997                 host->flags &= ~SDHCI_NEEDS_RETUNING;
1998                 /* Reload the new initial value for timer */
1999                 mod_timer(&host->tuning_timer, jiffies +
2000                           host->tuning_count * HZ);
2001         }
2002
2003         /*
2004          * In case tuning fails, host controllers which support re-tuning can
2005          * try tuning again at a later time, when the re-tuning timer expires.
2006          * So for these controllers, we return 0. Since there might be other
2007          * controllers who do not have this capability, we return error for
2008          * them. SDHCI_USING_RETUNING_TIMER means the host is currently using
2009          * a retuning timer to do the retuning for the card.
2010          */
2011         if (err && (host->flags & SDHCI_USING_RETUNING_TIMER))
2012                 err = 0;
2013
2014         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2015         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2016         spin_unlock_irqrestore(&host->lock, flags);
2017         sdhci_runtime_pm_put(host);
2018
2019         return err;
2020 }
2021
2022
2023 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2024 {
2025         /* Host Controller v3.00 defines preset value registers */
2026         if (host->version < SDHCI_SPEC_300)
2027                 return;
2028
2029         /*
2030          * We only enable or disable Preset Value if they are not already
2031          * enabled or disabled respectively. Otherwise, we bail out.
2032          */
2033         if (host->preset_enabled != enable) {
2034                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2035
2036                 if (enable)
2037                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2038                 else
2039                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2040
2041                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2042
2043                 if (enable)
2044                         host->flags |= SDHCI_PV_ENABLED;
2045                 else
2046                         host->flags &= ~SDHCI_PV_ENABLED;
2047
2048                 host->preset_enabled = enable;
2049         }
2050 }
2051
2052 static void sdhci_card_event(struct mmc_host *mmc)
2053 {
2054         struct sdhci_host *host = mmc_priv(mmc);
2055         unsigned long flags;
2056
2057         /* First check if client has provided their own card event */
2058         if (host->ops->card_event)
2059                 host->ops->card_event(host);
2060
2061         spin_lock_irqsave(&host->lock, flags);
2062
2063         /* Check host->mrq first in case we are runtime suspended */
2064         if (host->mrq && !sdhci_do_get_cd(host)) {
2065                 pr_err("%s: Card removed during transfer!\n",
2066                         mmc_hostname(host->mmc));
2067                 pr_err("%s: Resetting controller.\n",
2068                         mmc_hostname(host->mmc));
2069
2070                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2071                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2072
2073                 host->mrq->cmd->error = -ENOMEDIUM;
2074                 tasklet_schedule(&host->finish_tasklet);
2075         }
2076
2077         spin_unlock_irqrestore(&host->lock, flags);
2078 }
2079
2080 static const struct mmc_host_ops sdhci_ops = {
2081         .request        = sdhci_request,
2082         .set_ios        = sdhci_set_ios,
2083         .get_cd         = sdhci_get_cd,
2084         .get_ro         = sdhci_get_ro,
2085         .hw_reset       = sdhci_hw_reset,
2086         .enable_sdio_irq = sdhci_enable_sdio_irq,
2087         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2088         .execute_tuning                 = sdhci_execute_tuning,
2089         .card_event                     = sdhci_card_event,
2090         .card_busy      = sdhci_card_busy,
2091 };
2092
2093 /*****************************************************************************\
2094  *                                                                           *
2095  * Tasklets                                                                  *
2096  *                                                                           *
2097 \*****************************************************************************/
2098
2099 static void sdhci_tasklet_finish(unsigned long param)
2100 {
2101         struct sdhci_host *host;
2102         unsigned long flags;
2103         struct mmc_request *mrq;
2104
2105         host = (struct sdhci_host*)param;
2106
2107         spin_lock_irqsave(&host->lock, flags);
2108
2109         /*
2110          * If this tasklet gets rescheduled while running, it will
2111          * be run again afterwards but without any active request.
2112          */
2113         if (!host->mrq) {
2114                 spin_unlock_irqrestore(&host->lock, flags);
2115                 return;
2116         }
2117
2118         del_timer(&host->timer);
2119
2120         mrq = host->mrq;
2121
2122         /*
2123          * The controller needs a reset of internal state machines
2124          * upon error conditions.
2125          */
2126         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2127             ((mrq->cmd && mrq->cmd->error) ||
2128                  (mrq->data && (mrq->data->error ||
2129                   (mrq->data->stop && mrq->data->stop->error))) ||
2130                    (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2131
2132                 /* Some controllers need this kick or reset won't work here */
2133                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2134                         /* This is to force an update */
2135                         host->ops->set_clock(host, host->clock);
2136
2137                 /* Spec says we should do both at the same time, but Ricoh
2138                    controllers do not like that. */
2139                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2140                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2141         }
2142
2143         host->mrq = NULL;
2144         host->cmd = NULL;
2145         host->data = NULL;
2146
2147 #ifndef SDHCI_USE_LEDS_CLASS
2148         sdhci_deactivate_led(host);
2149 #endif
2150
2151         mmiowb();
2152         spin_unlock_irqrestore(&host->lock, flags);
2153
2154         mmc_request_done(host->mmc, mrq);
2155         sdhci_runtime_pm_put(host);
2156 }
2157
2158 static void sdhci_timeout_timer(unsigned long data)
2159 {
2160         struct sdhci_host *host;
2161         unsigned long flags;
2162
2163         host = (struct sdhci_host*)data;
2164
2165         spin_lock_irqsave(&host->lock, flags);
2166
2167         if (host->mrq) {
2168                 pr_err("%s: Timeout waiting for hardware "
2169                         "interrupt.\n", mmc_hostname(host->mmc));
2170                 sdhci_dumpregs(host);
2171
2172                 if (host->data) {
2173                         host->data->error = -ETIMEDOUT;
2174                         sdhci_finish_data(host);
2175                 } else {
2176                         if (host->cmd)
2177                                 host->cmd->error = -ETIMEDOUT;
2178                         else
2179                                 host->mrq->cmd->error = -ETIMEDOUT;
2180
2181                         tasklet_schedule(&host->finish_tasklet);
2182                 }
2183         }
2184
2185         mmiowb();
2186         spin_unlock_irqrestore(&host->lock, flags);
2187 }
2188
2189 static void sdhci_tuning_timer(unsigned long data)
2190 {
2191         struct sdhci_host *host;
2192         unsigned long flags;
2193
2194         host = (struct sdhci_host *)data;
2195
2196         spin_lock_irqsave(&host->lock, flags);
2197
2198         host->flags |= SDHCI_NEEDS_RETUNING;
2199
2200         spin_unlock_irqrestore(&host->lock, flags);
2201 }
2202
2203 /*****************************************************************************\
2204  *                                                                           *
2205  * Interrupt handling                                                        *
2206  *                                                                           *
2207 \*****************************************************************************/
2208
2209 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
2210 {
2211         BUG_ON(intmask == 0);
2212
2213         if (!host->cmd) {
2214                 pr_err("%s: Got command interrupt 0x%08x even "
2215                         "though no command operation was in progress.\n",
2216                         mmc_hostname(host->mmc), (unsigned)intmask);
2217                 sdhci_dumpregs(host);
2218                 return;
2219         }
2220
2221         if (intmask & SDHCI_INT_TIMEOUT)
2222                 host->cmd->error = -ETIMEDOUT;
2223         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
2224                         SDHCI_INT_INDEX))
2225                 host->cmd->error = -EILSEQ;
2226
2227         if (host->cmd->error) {
2228                 tasklet_schedule(&host->finish_tasklet);
2229                 return;
2230         }
2231
2232         /*
2233          * The host can send and interrupt when the busy state has
2234          * ended, allowing us to wait without wasting CPU cycles.
2235          * Unfortunately this is overloaded on the "data complete"
2236          * interrupt, so we need to take some care when handling
2237          * it.
2238          *
2239          * Note: The 1.0 specification is a bit ambiguous about this
2240          *       feature so there might be some problems with older
2241          *       controllers.
2242          */
2243         if (host->cmd->flags & MMC_RSP_BUSY) {
2244                 if (host->cmd->data)
2245                         DBG("Cannot wait for busy signal when also "
2246                                 "doing a data transfer");
2247                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
2248                         return;
2249
2250                 /* The controller does not support the end-of-busy IRQ,
2251                  * fall through and take the SDHCI_INT_RESPONSE */
2252         }
2253
2254         if (intmask & SDHCI_INT_RESPONSE)
2255                 sdhci_finish_command(host);
2256 }
2257
2258 #ifdef CONFIG_MMC_DEBUG
2259 static void sdhci_show_adma_error(struct sdhci_host *host)
2260 {
2261         const char *name = mmc_hostname(host->mmc);
2262         u8 *desc = host->adma_desc;
2263         __le32 *dma;
2264         __le16 *len;
2265         u8 attr;
2266
2267         sdhci_dumpregs(host);
2268
2269         while (true) {
2270                 dma = (__le32 *)(desc + 4);
2271                 len = (__le16 *)(desc + 2);
2272                 attr = *desc;
2273
2274                 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2275                     name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr);
2276
2277                 desc += 8;
2278
2279                 if (attr & 2)
2280                         break;
2281         }
2282 }
2283 #else
2284 static void sdhci_show_adma_error(struct sdhci_host *host) { }
2285 #endif
2286
2287 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2288 {
2289         u32 command;
2290         BUG_ON(intmask == 0);
2291
2292         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2293         if (intmask & SDHCI_INT_DATA_AVAIL) {
2294                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2295                 if (command == MMC_SEND_TUNING_BLOCK ||
2296                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2297                         host->tuning_done = 1;
2298                         wake_up(&host->buf_ready_int);
2299                         return;
2300                 }
2301         }
2302
2303         if (!host->data) {
2304                 /*
2305                  * The "data complete" interrupt is also used to
2306                  * indicate that a busy state has ended. See comment
2307                  * above in sdhci_cmd_irq().
2308                  */
2309                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2310                         if (intmask & SDHCI_INT_DATA_END) {
2311                                 sdhci_finish_command(host);
2312                                 return;
2313                         }
2314                 }
2315
2316                 pr_err("%s: Got data interrupt 0x%08x even "
2317                         "though no data operation was in progress.\n",
2318                         mmc_hostname(host->mmc), (unsigned)intmask);
2319                 sdhci_dumpregs(host);
2320
2321                 return;
2322         }
2323
2324         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2325                 host->data->error = -ETIMEDOUT;
2326         else if (intmask & SDHCI_INT_DATA_END_BIT)
2327                 host->data->error = -EILSEQ;
2328         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2329                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2330                         != MMC_BUS_TEST_R)
2331                 host->data->error = -EILSEQ;
2332         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2333                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2334                 sdhci_show_adma_error(host);
2335                 host->data->error = -EIO;
2336                 if (host->ops->adma_workaround)
2337                         host->ops->adma_workaround(host, intmask);
2338         }
2339
2340         if (host->data->error)
2341                 sdhci_finish_data(host);
2342         else {
2343                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2344                         sdhci_transfer_pio(host);
2345
2346                 /*
2347                  * We currently don't do anything fancy with DMA
2348                  * boundaries, but as we can't disable the feature
2349                  * we need to at least restart the transfer.
2350                  *
2351                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2352                  * should return a valid address to continue from, but as
2353                  * some controllers are faulty, don't trust them.
2354                  */
2355                 if (intmask & SDHCI_INT_DMA_END) {
2356                         u32 dmastart, dmanow;
2357                         dmastart = sg_dma_address(host->data->sg);
2358                         dmanow = dmastart + host->data->bytes_xfered;
2359                         /*
2360                          * Force update to the next DMA block boundary.
2361                          */
2362                         dmanow = (dmanow &
2363                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2364                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2365                         host->data->bytes_xfered = dmanow - dmastart;
2366                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2367                                 " next 0x%08x\n",
2368                                 mmc_hostname(host->mmc), dmastart,
2369                                 host->data->bytes_xfered, dmanow);
2370                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2371                 }
2372
2373                 if (intmask & SDHCI_INT_DATA_END) {
2374                         if (host->cmd) {
2375                                 /*
2376                                  * Data managed to finish before the
2377                                  * command completed. Make sure we do
2378                                  * things in the proper order.
2379                                  */
2380                                 host->data_early = 1;
2381                         } else {
2382                                 sdhci_finish_data(host);
2383                         }
2384                 }
2385         }
2386 }
2387
2388 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2389 {
2390         irqreturn_t result = IRQ_NONE;
2391         struct sdhci_host *host = dev_id;
2392         u32 intmask, mask, unexpected = 0;
2393         int max_loops = 16;
2394
2395         spin_lock(&host->lock);
2396
2397         if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2398                 spin_unlock(&host->lock);
2399                 return IRQ_NONE;
2400         }
2401
2402         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2403         if (!intmask || intmask == 0xffffffff) {
2404                 result = IRQ_NONE;
2405                 goto out;
2406         }
2407
2408         do {
2409                 /* Clear selected interrupts. */
2410                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2411                                   SDHCI_INT_BUS_POWER);
2412                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2413
2414                 DBG("*** %s got interrupt: 0x%08x\n",
2415                         mmc_hostname(host->mmc), intmask);
2416
2417                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2418                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2419                                       SDHCI_CARD_PRESENT;
2420
2421                         /*
2422                          * There is a observation on i.mx esdhc.  INSERT
2423                          * bit will be immediately set again when it gets
2424                          * cleared, if a card is inserted.  We have to mask
2425                          * the irq to prevent interrupt storm which will
2426                          * freeze the system.  And the REMOVE gets the
2427                          * same situation.
2428                          *
2429                          * More testing are needed here to ensure it works
2430                          * for other platforms though.
2431                          */
2432                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
2433                                        SDHCI_INT_CARD_REMOVE);
2434                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2435                                                SDHCI_INT_CARD_INSERT;
2436                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2437                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2438
2439                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2440                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2441
2442                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2443                                                        SDHCI_INT_CARD_REMOVE);
2444                         result = IRQ_WAKE_THREAD;
2445                 }
2446
2447                 if (intmask & SDHCI_INT_CMD_MASK)
2448                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2449
2450                 if (intmask & SDHCI_INT_DATA_MASK)
2451                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2452
2453                 if (intmask & SDHCI_INT_BUS_POWER)
2454                         pr_err("%s: Card is consuming too much power!\n",
2455                                 mmc_hostname(host->mmc));
2456
2457                 if (intmask & SDHCI_INT_CARD_INT) {
2458                         sdhci_enable_sdio_irq_nolock(host, false);
2459                         host->thread_isr |= SDHCI_INT_CARD_INT;
2460                         result = IRQ_WAKE_THREAD;
2461                 }
2462
2463                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2464                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2465                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2466                              SDHCI_INT_CARD_INT);
2467
2468                 if (intmask) {
2469                         unexpected |= intmask;
2470                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2471                 }
2472
2473                 if (result == IRQ_NONE)
2474                         result = IRQ_HANDLED;
2475
2476                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2477         } while (intmask && --max_loops);
2478 out:
2479         spin_unlock(&host->lock);
2480
2481         if (unexpected) {
2482                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2483                            mmc_hostname(host->mmc), unexpected);
2484                 sdhci_dumpregs(host);
2485         }
2486
2487         return result;
2488 }
2489
2490 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2491 {
2492         struct sdhci_host *host = dev_id;
2493         unsigned long flags;
2494         u32 isr;
2495
2496         spin_lock_irqsave(&host->lock, flags);
2497         isr = host->thread_isr;
2498         host->thread_isr = 0;
2499         spin_unlock_irqrestore(&host->lock, flags);
2500
2501         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2502                 sdhci_card_event(host->mmc);
2503                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2504         }
2505
2506         if (isr & SDHCI_INT_CARD_INT) {
2507                 sdio_run_irqs(host->mmc);
2508
2509                 spin_lock_irqsave(&host->lock, flags);
2510                 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2511                         sdhci_enable_sdio_irq_nolock(host, true);
2512                 spin_unlock_irqrestore(&host->lock, flags);
2513         }
2514
2515         return isr ? IRQ_HANDLED : IRQ_NONE;
2516 }
2517
2518 /*****************************************************************************\
2519  *                                                                           *
2520  * Suspend/resume                                                            *
2521  *                                                                           *
2522 \*****************************************************************************/
2523
2524 #ifdef CONFIG_PM
2525 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2526 {
2527         u8 val;
2528         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2529                         | SDHCI_WAKE_ON_INT;
2530
2531         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2532         val |= mask ;
2533         /* Avoid fake wake up */
2534         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2535                 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2536         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2537 }
2538 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2539
2540 void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2541 {
2542         u8 val;
2543         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2544                         | SDHCI_WAKE_ON_INT;
2545
2546         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2547         val &= ~mask;
2548         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2549 }
2550 EXPORT_SYMBOL_GPL(sdhci_disable_irq_wakeups);
2551
2552 int sdhci_suspend_host(struct sdhci_host *host)
2553 {
2554         sdhci_disable_card_detection(host);
2555
2556         /* Disable tuning since we are suspending */
2557         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2558                 del_timer_sync(&host->tuning_timer);
2559                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2560         }
2561
2562         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2563                 host->ier = 0;
2564                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2565                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2566                 free_irq(host->irq, host);
2567         } else {
2568                 sdhci_enable_irq_wakeups(host);
2569                 enable_irq_wake(host->irq);
2570         }
2571         return 0;
2572 }
2573
2574 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2575
2576 int sdhci_resume_host(struct sdhci_host *host)
2577 {
2578         int ret = 0;
2579
2580         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2581                 if (host->ops->enable_dma)
2582                         host->ops->enable_dma(host);
2583         }
2584
2585         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2586                 ret = request_threaded_irq(host->irq, sdhci_irq,
2587                                            sdhci_thread_irq, IRQF_SHARED,
2588                                            mmc_hostname(host->mmc), host);
2589                 if (ret)
2590                         return ret;
2591         } else {
2592                 sdhci_disable_irq_wakeups(host);
2593                 disable_irq_wake(host->irq);
2594         }
2595
2596         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2597             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2598                 /* Card keeps power but host controller does not */
2599                 sdhci_init(host, 0);
2600                 host->pwr = 0;
2601                 host->clock = 0;
2602                 sdhci_do_set_ios(host, &host->mmc->ios);
2603         } else {
2604                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2605                 mmiowb();
2606         }
2607
2608         sdhci_enable_card_detection(host);
2609
2610         /* Set the re-tuning expiration flag */
2611         if (host->flags & SDHCI_USING_RETUNING_TIMER)
2612                 host->flags |= SDHCI_NEEDS_RETUNING;
2613
2614         return ret;
2615 }
2616
2617 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2618 #endif /* CONFIG_PM */
2619
2620 #ifdef CONFIG_PM_RUNTIME
2621
2622 static int sdhci_runtime_pm_get(struct sdhci_host *host)
2623 {
2624         return pm_runtime_get_sync(host->mmc->parent);
2625 }
2626
2627 static int sdhci_runtime_pm_put(struct sdhci_host *host)
2628 {
2629         pm_runtime_mark_last_busy(host->mmc->parent);
2630         return pm_runtime_put_autosuspend(host->mmc->parent);
2631 }
2632
2633 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
2634 {
2635         if (host->runtime_suspended || host->bus_on)
2636                 return;
2637         host->bus_on = true;
2638         pm_runtime_get_noresume(host->mmc->parent);
2639 }
2640
2641 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
2642 {
2643         if (host->runtime_suspended || !host->bus_on)
2644                 return;
2645         host->bus_on = false;
2646         pm_runtime_put_noidle(host->mmc->parent);
2647 }
2648
2649 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2650 {
2651         unsigned long flags;
2652         int ret = 0;
2653
2654         /* Disable tuning since we are suspending */
2655         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2656                 del_timer_sync(&host->tuning_timer);
2657                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2658         }
2659
2660         spin_lock_irqsave(&host->lock, flags);
2661         host->ier &= SDHCI_INT_CARD_INT;
2662         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2663         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2664         spin_unlock_irqrestore(&host->lock, flags);
2665
2666         synchronize_hardirq(host->irq);
2667
2668         spin_lock_irqsave(&host->lock, flags);
2669         host->runtime_suspended = true;
2670         spin_unlock_irqrestore(&host->lock, flags);
2671
2672         return ret;
2673 }
2674 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2675
2676 int sdhci_runtime_resume_host(struct sdhci_host *host)
2677 {
2678         unsigned long flags;
2679         int ret = 0, host_flags = host->flags;
2680
2681         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2682                 if (host->ops->enable_dma)
2683                         host->ops->enable_dma(host);
2684         }
2685
2686         sdhci_init(host, 0);
2687
2688         /* Force clock and power re-program */
2689         host->pwr = 0;
2690         host->clock = 0;
2691         sdhci_do_set_ios(host, &host->mmc->ios);
2692
2693         sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2694         if ((host_flags & SDHCI_PV_ENABLED) &&
2695                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2696                 spin_lock_irqsave(&host->lock, flags);
2697                 sdhci_enable_preset_value(host, true);
2698                 spin_unlock_irqrestore(&host->lock, flags);
2699         }
2700
2701         /* Set the re-tuning expiration flag */
2702         if (host->flags & SDHCI_USING_RETUNING_TIMER)
2703                 host->flags |= SDHCI_NEEDS_RETUNING;
2704
2705         spin_lock_irqsave(&host->lock, flags);
2706
2707         host->runtime_suspended = false;
2708
2709         /* Enable SDIO IRQ */
2710         if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2711                 sdhci_enable_sdio_irq_nolock(host, true);
2712
2713         /* Enable Card Detection */
2714         sdhci_enable_card_detection(host);
2715
2716         spin_unlock_irqrestore(&host->lock, flags);
2717
2718         return ret;
2719 }
2720 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2721
2722 #endif
2723
2724 /*****************************************************************************\
2725  *                                                                           *
2726  * Device allocation/registration                                            *
2727  *                                                                           *
2728 \*****************************************************************************/
2729
2730 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2731         size_t priv_size)
2732 {
2733         struct mmc_host *mmc;
2734         struct sdhci_host *host;
2735
2736         WARN_ON(dev == NULL);
2737
2738         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2739         if (!mmc)
2740                 return ERR_PTR(-ENOMEM);
2741
2742         host = mmc_priv(mmc);
2743         host->mmc = mmc;
2744
2745         return host;
2746 }
2747
2748 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2749
2750 int sdhci_add_host(struct sdhci_host *host)
2751 {
2752         struct mmc_host *mmc;
2753         u32 caps[2] = {0, 0};
2754         u32 max_current_caps;
2755         unsigned int ocr_avail;
2756         int ret;
2757
2758         WARN_ON(host == NULL);
2759         if (host == NULL)
2760                 return -EINVAL;
2761
2762         mmc = host->mmc;
2763
2764         if (debug_quirks)
2765                 host->quirks = debug_quirks;
2766         if (debug_quirks2)
2767                 host->quirks2 = debug_quirks2;
2768
2769         sdhci_do_reset(host, SDHCI_RESET_ALL);
2770
2771         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2772         host->version = (host->version & SDHCI_SPEC_VER_MASK)
2773                                 >> SDHCI_SPEC_VER_SHIFT;
2774         if (host->version > SDHCI_SPEC_300) {
2775                 pr_err("%s: Unknown controller version (%d). "
2776                         "You may experience problems.\n", mmc_hostname(mmc),
2777                         host->version);
2778         }
2779
2780         caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2781                 sdhci_readl(host, SDHCI_CAPABILITIES);
2782
2783         if (host->version >= SDHCI_SPEC_300)
2784                 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2785                         host->caps1 :
2786                         sdhci_readl(host, SDHCI_CAPABILITIES_1);
2787
2788         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2789                 host->flags |= SDHCI_USE_SDMA;
2790         else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2791                 DBG("Controller doesn't have SDMA capability\n");
2792         else
2793                 host->flags |= SDHCI_USE_SDMA;
2794
2795         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2796                 (host->flags & SDHCI_USE_SDMA)) {
2797                 DBG("Disabling DMA as it is marked broken\n");
2798                 host->flags &= ~SDHCI_USE_SDMA;
2799         }
2800
2801         if ((host->version >= SDHCI_SPEC_200) &&
2802                 (caps[0] & SDHCI_CAN_DO_ADMA2))
2803                 host->flags |= SDHCI_USE_ADMA;
2804
2805         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2806                 (host->flags & SDHCI_USE_ADMA)) {
2807                 DBG("Disabling ADMA as it is marked broken\n");
2808                 host->flags &= ~SDHCI_USE_ADMA;
2809         }
2810
2811         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2812                 if (host->ops->enable_dma) {
2813                         if (host->ops->enable_dma(host)) {
2814                                 pr_warning("%s: No suitable DMA "
2815                                         "available. Falling back to PIO.\n",
2816                                         mmc_hostname(mmc));
2817                                 host->flags &=
2818                                         ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2819                         }
2820                 }
2821         }
2822
2823         if (host->flags & SDHCI_USE_ADMA) {
2824                 /*
2825                  * We need to allocate descriptors for all sg entries
2826                  * (128) and potentially one alignment transfer for
2827                  * each of those entries.
2828                  */
2829                 host->adma_desc = dma_alloc_coherent(mmc_dev(host->mmc),
2830                                                      ADMA_SIZE, &host->adma_addr,
2831                                                      GFP_KERNEL);
2832                 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
2833                 if (!host->adma_desc || !host->align_buffer) {
2834                         dma_free_coherent(mmc_dev(host->mmc), ADMA_SIZE,
2835                                           host->adma_desc, host->adma_addr);
2836                         kfree(host->align_buffer);
2837                         pr_warning("%s: Unable to allocate ADMA "
2838                                 "buffers. Falling back to standard DMA.\n",
2839                                 mmc_hostname(mmc));
2840                         host->flags &= ~SDHCI_USE_ADMA;
2841                         host->adma_desc = NULL;
2842                         host->align_buffer = NULL;
2843                 } else if (host->adma_addr & 3) {
2844                         pr_warning("%s: unable to allocate aligned ADMA descriptor\n",
2845                                    mmc_hostname(mmc));
2846                         host->flags &= ~SDHCI_USE_ADMA;
2847                         dma_free_coherent(mmc_dev(host->mmc), ADMA_SIZE,
2848                                           host->adma_desc, host->adma_addr);
2849                         kfree(host->align_buffer);
2850                         host->adma_desc = NULL;
2851                         host->align_buffer = NULL;
2852                 }
2853         }
2854
2855         /*
2856          * If we use DMA, then it's up to the caller to set the DMA
2857          * mask, but PIO does not need the hw shim so we set a new
2858          * mask here in that case.
2859          */
2860         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
2861                 host->dma_mask = DMA_BIT_MASK(64);
2862                 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
2863         }
2864
2865         if (host->version >= SDHCI_SPEC_300)
2866                 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
2867                         >> SDHCI_CLOCK_BASE_SHIFT;
2868         else
2869                 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
2870                         >> SDHCI_CLOCK_BASE_SHIFT;
2871
2872         host->max_clk *= 1000000;
2873         if (host->max_clk == 0 || host->quirks &
2874                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
2875                 if (!host->ops->get_max_clock) {
2876                         pr_err("%s: Hardware doesn't specify base clock "
2877                                "frequency.\n", mmc_hostname(mmc));
2878                         return -ENODEV;
2879                 }
2880                 host->max_clk = host->ops->get_max_clock(host);
2881         }
2882
2883         /*
2884          * In case of Host Controller v3.00, find out whether clock
2885          * multiplier is supported.
2886          */
2887         host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
2888                         SDHCI_CLOCK_MUL_SHIFT;
2889
2890         /*
2891          * In case the value in Clock Multiplier is 0, then programmable
2892          * clock mode is not supported, otherwise the actual clock
2893          * multiplier is one more than the value of Clock Multiplier
2894          * in the Capabilities Register.
2895          */
2896         if (host->clk_mul)
2897                 host->clk_mul += 1;
2898
2899         /*
2900          * Set host parameters.
2901          */
2902         mmc->ops = &sdhci_ops;
2903         mmc->f_max = host->max_clk;
2904         if (host->ops->get_min_clock)
2905                 mmc->f_min = host->ops->get_min_clock(host);
2906         else if (host->version >= SDHCI_SPEC_300) {
2907                 if (host->clk_mul) {
2908                         mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
2909                         mmc->f_max = host->max_clk * host->clk_mul;
2910                 } else
2911                         mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
2912         } else
2913                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
2914
2915         host->timeout_clk =
2916                 (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
2917         if (host->timeout_clk == 0) {
2918                 if (host->ops->get_timeout_clock) {
2919                         host->timeout_clk = host->ops->get_timeout_clock(host);
2920                 } else if (!(host->quirks &
2921                                 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
2922                         pr_err("%s: Hardware doesn't specify timeout clock "
2923                                "frequency.\n", mmc_hostname(mmc));
2924                         return -ENODEV;
2925                 }
2926         }
2927         if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
2928                 host->timeout_clk *= 1000;
2929
2930         if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)
2931                 host->timeout_clk = mmc->f_max / 1000;
2932
2933         mmc->max_busy_timeout = (1 << 27) / host->timeout_clk;
2934
2935         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
2936         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
2937
2938         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
2939                 host->flags |= SDHCI_AUTO_CMD12;
2940
2941         /* Auto-CMD23 stuff only works in ADMA or PIO. */
2942         if ((host->version >= SDHCI_SPEC_300) &&
2943             ((host->flags & SDHCI_USE_ADMA) ||
2944              !(host->flags & SDHCI_USE_SDMA))) {
2945                 host->flags |= SDHCI_AUTO_CMD23;
2946                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
2947         } else {
2948                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
2949         }
2950
2951         /*
2952          * A controller may support 8-bit width, but the board itself
2953          * might not have the pins brought out.  Boards that support
2954          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
2955          * their platform code before calling sdhci_add_host(), and we
2956          * won't assume 8-bit width for hosts without that CAP.
2957          */
2958         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
2959                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2960
2961         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
2962                 mmc->caps &= ~MMC_CAP_CMD23;
2963
2964         if (caps[0] & SDHCI_CAN_DO_HISPD)
2965                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2966
2967         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
2968             !(host->mmc->caps & MMC_CAP_NONREMOVABLE))
2969                 mmc->caps |= MMC_CAP_NEEDS_POLL;
2970
2971         /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
2972         host->vqmmc = regulator_get_optional(mmc_dev(mmc), "vqmmc");
2973         if (IS_ERR_OR_NULL(host->vqmmc)) {
2974                 if (PTR_ERR(host->vqmmc) < 0) {
2975                         pr_info("%s: no vqmmc regulator found\n",
2976                                 mmc_hostname(mmc));
2977                         host->vqmmc = NULL;
2978                 }
2979         } else {
2980                 ret = regulator_enable(host->vqmmc);
2981                 if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
2982                         1950000))
2983                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
2984                                         SDHCI_SUPPORT_SDR50 |
2985                                         SDHCI_SUPPORT_DDR50);
2986                 if (ret) {
2987                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
2988                                 mmc_hostname(mmc), ret);
2989                         host->vqmmc = NULL;
2990                 }
2991         }
2992
2993         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
2994                 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
2995                        SDHCI_SUPPORT_DDR50);
2996
2997         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
2998         if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
2999                        SDHCI_SUPPORT_DDR50))
3000                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3001
3002         /* SDR104 supports also implies SDR50 support */
3003         if (caps[1] & SDHCI_SUPPORT_SDR104) {
3004                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3005                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3006                  * field can be promoted to support HS200.
3007                  */
3008                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3009                         mmc->caps2 |= MMC_CAP2_HS200;
3010         } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3011                 mmc->caps |= MMC_CAP_UHS_SDR50;
3012
3013         if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3014                 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3015                 mmc->caps |= MMC_CAP_UHS_DDR50;
3016
3017         /* Does the host need tuning for SDR50? */
3018         if (caps[1] & SDHCI_USE_SDR50_TUNING)
3019                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3020
3021         /* Does the host need tuning for SDR104 / HS200? */
3022         if (mmc->caps2 & MMC_CAP2_HS200)
3023                 host->flags |= SDHCI_SDR104_NEEDS_TUNING;
3024
3025         /* Driver Type(s) (A, C, D) supported by the host */
3026         if (caps[1] & SDHCI_DRIVER_TYPE_A)
3027                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3028         if (caps[1] & SDHCI_DRIVER_TYPE_C)
3029                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3030         if (caps[1] & SDHCI_DRIVER_TYPE_D)
3031                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3032
3033         /* Initial value for re-tuning timer count */
3034         host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3035                               SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3036
3037         /*
3038          * In case Re-tuning Timer is not disabled, the actual value of
3039          * re-tuning timer will be 2 ^ (n - 1).
3040          */
3041         if (host->tuning_count)
3042                 host->tuning_count = 1 << (host->tuning_count - 1);
3043
3044         /* Re-tuning mode supported by the Host Controller */
3045         host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3046                              SDHCI_RETUNING_MODE_SHIFT;
3047
3048         ocr_avail = 0;
3049
3050         host->vmmc = regulator_get_optional(mmc_dev(mmc), "vmmc");
3051         if (IS_ERR_OR_NULL(host->vmmc)) {
3052                 if (PTR_ERR(host->vmmc) < 0) {
3053                         pr_info("%s: no vmmc regulator found\n",
3054                                 mmc_hostname(mmc));
3055                         host->vmmc = NULL;
3056                 }
3057         }
3058
3059 #ifdef CONFIG_REGULATOR
3060         /*
3061          * Voltage range check makes sense only if regulator reports
3062          * any voltage value.
3063          */
3064         if (host->vmmc && regulator_get_voltage(host->vmmc) > 0) {
3065                 ret = regulator_is_supported_voltage(host->vmmc, 2700000,
3066                         3600000);
3067                 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330)))
3068                         caps[0] &= ~SDHCI_CAN_VDD_330;
3069                 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300)))
3070                         caps[0] &= ~SDHCI_CAN_VDD_300;
3071                 ret = regulator_is_supported_voltage(host->vmmc, 1700000,
3072                         1950000);
3073                 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180)))
3074                         caps[0] &= ~SDHCI_CAN_VDD_180;
3075         }
3076 #endif /* CONFIG_REGULATOR */
3077
3078         /*
3079          * According to SD Host Controller spec v3.00, if the Host System
3080          * can afford more than 150mA, Host Driver should set XPC to 1. Also
3081          * the value is meaningful only if Voltage Support in the Capabilities
3082          * register is set. The actual current value is 4 times the register
3083          * value.
3084          */
3085         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3086         if (!max_current_caps && host->vmmc) {
3087                 u32 curr = regulator_get_current_limit(host->vmmc);
3088                 if (curr > 0) {
3089
3090                         /* convert to SDHCI_MAX_CURRENT format */
3091                         curr = curr/1000;  /* convert to mA */
3092                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3093
3094                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3095                         max_current_caps =
3096                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3097                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3098                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3099                 }
3100         }
3101
3102         if (caps[0] & SDHCI_CAN_VDD_330) {
3103                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3104
3105                 mmc->max_current_330 = ((max_current_caps &
3106                                    SDHCI_MAX_CURRENT_330_MASK) >>
3107                                    SDHCI_MAX_CURRENT_330_SHIFT) *
3108                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3109         }
3110         if (caps[0] & SDHCI_CAN_VDD_300) {
3111                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3112
3113                 mmc->max_current_300 = ((max_current_caps &
3114                                    SDHCI_MAX_CURRENT_300_MASK) >>
3115                                    SDHCI_MAX_CURRENT_300_SHIFT) *
3116                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3117         }
3118         if (caps[0] & SDHCI_CAN_VDD_180) {
3119                 ocr_avail |= MMC_VDD_165_195;
3120
3121                 mmc->max_current_180 = ((max_current_caps &
3122                                    SDHCI_MAX_CURRENT_180_MASK) >>
3123                                    SDHCI_MAX_CURRENT_180_SHIFT) *
3124                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3125         }
3126
3127         if (host->ocr_mask)
3128                 ocr_avail = host->ocr_mask;
3129
3130         mmc->ocr_avail = ocr_avail;
3131         mmc->ocr_avail_sdio = ocr_avail;
3132         if (host->ocr_avail_sdio)
3133                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3134         mmc->ocr_avail_sd = ocr_avail;
3135         if (host->ocr_avail_sd)
3136                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3137         else /* normal SD controllers don't support 1.8V */
3138                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3139         mmc->ocr_avail_mmc = ocr_avail;
3140         if (host->ocr_avail_mmc)
3141                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3142
3143         if (mmc->ocr_avail == 0) {
3144                 pr_err("%s: Hardware doesn't report any "
3145                         "support voltages.\n", mmc_hostname(mmc));
3146                 return -ENODEV;
3147         }
3148
3149         spin_lock_init(&host->lock);
3150
3151         /*
3152          * Maximum number of segments. Depends on if the hardware
3153          * can do scatter/gather or not.
3154          */
3155         if (host->flags & SDHCI_USE_ADMA)
3156                 mmc->max_segs = 128;
3157         else if (host->flags & SDHCI_USE_SDMA)
3158                 mmc->max_segs = 1;
3159         else /* PIO */
3160                 mmc->max_segs = 128;
3161
3162         /*
3163          * Maximum number of sectors in one transfer. Limited by DMA boundary
3164          * size (512KiB).
3165          */
3166         mmc->max_req_size = 524288;
3167
3168         /*
3169          * Maximum segment size. Could be one segment with the maximum number
3170          * of bytes. When doing hardware scatter/gather, each entry cannot
3171          * be larger than 64 KiB though.
3172          */
3173         if (host->flags & SDHCI_USE_ADMA) {
3174                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3175                         mmc->max_seg_size = 65535;
3176                 else
3177                         mmc->max_seg_size = 65536;
3178         } else {
3179                 mmc->max_seg_size = mmc->max_req_size;
3180         }
3181
3182         /*
3183          * Maximum block size. This varies from controller to controller and
3184          * is specified in the capabilities register.
3185          */
3186         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3187                 mmc->max_blk_size = 2;
3188         } else {
3189                 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3190                                 SDHCI_MAX_BLOCK_SHIFT;
3191                 if (mmc->max_blk_size >= 3) {
3192                         pr_warning("%s: Invalid maximum block size, "
3193                                 "assuming 512 bytes\n", mmc_hostname(mmc));
3194                         mmc->max_blk_size = 0;
3195                 }
3196         }
3197
3198         mmc->max_blk_size = 512 << mmc->max_blk_size;
3199
3200         /*
3201          * Maximum block count.
3202          */
3203         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3204
3205         /*
3206          * Init tasklets.
3207          */
3208         tasklet_init(&host->finish_tasklet,
3209                 sdhci_tasklet_finish, (unsigned long)host);
3210
3211         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3212
3213         if (host->version >= SDHCI_SPEC_300) {
3214                 init_waitqueue_head(&host->buf_ready_int);
3215
3216                 /* Initialize re-tuning timer */
3217                 init_timer(&host->tuning_timer);
3218                 host->tuning_timer.data = (unsigned long)host;
3219                 host->tuning_timer.function = sdhci_tuning_timer;
3220         }
3221
3222         sdhci_init(host, 0);
3223
3224         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3225                                    IRQF_SHARED, mmc_hostname(mmc), host);
3226         if (ret) {
3227                 pr_err("%s: Failed to request IRQ %d: %d\n",
3228                        mmc_hostname(mmc), host->irq, ret);
3229                 goto untasklet;
3230         }
3231
3232 #ifdef CONFIG_MMC_DEBUG
3233         sdhci_dumpregs(host);
3234 #endif
3235
3236 #ifdef SDHCI_USE_LEDS_CLASS
3237         snprintf(host->led_name, sizeof(host->led_name),
3238                 "%s::", mmc_hostname(mmc));
3239         host->led.name = host->led_name;
3240         host->led.brightness = LED_OFF;
3241         host->led.default_trigger = mmc_hostname(mmc);
3242         host->led.brightness_set = sdhci_led_control;
3243
3244         ret = led_classdev_register(mmc_dev(mmc), &host->led);
3245         if (ret) {
3246                 pr_err("%s: Failed to register LED device: %d\n",
3247                        mmc_hostname(mmc), ret);
3248                 goto reset;
3249         }
3250 #endif
3251
3252         mmiowb();
3253
3254         mmc_add_host(mmc);
3255
3256         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3257                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3258                 (host->flags & SDHCI_USE_ADMA) ? "ADMA" :
3259                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3260
3261         sdhci_enable_card_detection(host);
3262
3263         return 0;
3264
3265 #ifdef SDHCI_USE_LEDS_CLASS
3266 reset:
3267         sdhci_do_reset(host, SDHCI_RESET_ALL);
3268         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3269         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3270         free_irq(host->irq, host);
3271 #endif
3272 untasklet:
3273         tasklet_kill(&host->finish_tasklet);
3274
3275         return ret;
3276 }
3277
3278 EXPORT_SYMBOL_GPL(sdhci_add_host);
3279
3280 void sdhci_remove_host(struct sdhci_host *host, int dead)
3281 {
3282         unsigned long flags;
3283
3284         if (dead) {
3285                 spin_lock_irqsave(&host->lock, flags);
3286
3287                 host->flags |= SDHCI_DEVICE_DEAD;
3288
3289                 if (host->mrq) {
3290                         pr_err("%s: Controller removed during "
3291                                 " transfer!\n", mmc_hostname(host->mmc));
3292
3293                         host->mrq->cmd->error = -ENOMEDIUM;
3294                         tasklet_schedule(&host->finish_tasklet);
3295                 }
3296
3297                 spin_unlock_irqrestore(&host->lock, flags);
3298         }
3299
3300         sdhci_disable_card_detection(host);
3301
3302         mmc_remove_host(host->mmc);
3303
3304 #ifdef SDHCI_USE_LEDS_CLASS
3305         led_classdev_unregister(&host->led);
3306 #endif
3307
3308         if (!dead)
3309                 sdhci_do_reset(host, SDHCI_RESET_ALL);
3310
3311         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3312         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3313         free_irq(host->irq, host);
3314
3315         del_timer_sync(&host->timer);
3316
3317         tasklet_kill(&host->finish_tasklet);
3318
3319         if (host->vmmc) {
3320                 regulator_disable(host->vmmc);
3321                 regulator_put(host->vmmc);
3322         }
3323
3324         if (host->vqmmc) {
3325                 regulator_disable(host->vqmmc);
3326                 regulator_put(host->vqmmc);
3327         }
3328
3329         if (host->adma_desc)
3330                 dma_free_coherent(mmc_dev(host->mmc), ADMA_SIZE,
3331                                   host->adma_desc, host->adma_addr);
3332         kfree(host->align_buffer);
3333
3334         host->adma_desc = NULL;
3335         host->align_buffer = NULL;
3336 }
3337
3338 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3339
3340 void sdhci_free_host(struct sdhci_host *host)
3341 {
3342         mmc_free_host(host->mmc);
3343 }
3344
3345 EXPORT_SYMBOL_GPL(sdhci_free_host);
3346
3347 /*****************************************************************************\
3348  *                                                                           *
3349  * Driver init/exit                                                          *
3350  *                                                                           *
3351 \*****************************************************************************/
3352
3353 static int __init sdhci_drv_init(void)
3354 {
3355         pr_info(DRIVER_NAME
3356                 ": Secure Digital Host Controller Interface driver\n");
3357         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3358
3359         return 0;
3360 }
3361
3362 static void __exit sdhci_drv_exit(void)
3363 {
3364 }
3365
3366 module_init(sdhci_drv_init);
3367 module_exit(sdhci_drv_exit);
3368
3369 module_param(debug_quirks, uint, 0444);
3370 module_param(debug_quirks2, uint, 0444);
3371
3372 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3373 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3374 MODULE_LICENSE("GPL");
3375
3376 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3377 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");