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 #include <linux/of.h>
  26
  27 #include <linux/leds.h>
  28
  29 #include <linux/mmc/mmc.h>
  30 #include <linux/mmc/host.h>
  31 #include <linux/mmc/card.h>
  32 #include <linux/mmc/sdio.h>
  33 #include <linux/mmc/slot-gpio.h>
  34
  35 #include "sdhci.h"
  36
  37 #define DRIVER_NAME "sdhci"
  38
  39 #define DBG(f, x...) \
  40         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
  41
  42 #define MAX_TUNING_LOOP 40
  43
  44 static unsigned int debug_quirks = 0;
  45 static unsigned int debug_quirks2;
  46
  47 static void sdhci_finish_data(struct sdhci_host *);
  48
  49 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
  50
  51 static void sdhci_dumpregs(struct sdhci_host *host)
  52 {
  53         pr_err(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
  54                mmc_hostname(host->mmc));
  55
  56         pr_err(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
  57                sdhci_readl(host, SDHCI_DMA_ADDRESS),
  58                sdhci_readw(host, SDHCI_HOST_VERSION));
  59         pr_err(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
  60                sdhci_readw(host, SDHCI_BLOCK_SIZE),
  61                sdhci_readw(host, SDHCI_BLOCK_COUNT));
  62         pr_err(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
  63                sdhci_readl(host, SDHCI_ARGUMENT),
  64                sdhci_readw(host, SDHCI_TRANSFER_MODE));
  65         pr_err(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
  66                sdhci_readl(host, SDHCI_PRESENT_STATE),
  67                sdhci_readb(host, SDHCI_HOST_CONTROL));
  68         pr_err(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
  69                sdhci_readb(host, SDHCI_POWER_CONTROL),
  70                sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
  71         pr_err(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
  72                sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
  73                sdhci_readw(host, SDHCI_CLOCK_CONTROL));
  74         pr_err(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
  75                sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
  76                sdhci_readl(host, SDHCI_INT_STATUS));
  77         pr_err(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
  78                sdhci_readl(host, SDHCI_INT_ENABLE),
  79                sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
  80         pr_err(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
  81                sdhci_readw(host, SDHCI_ACMD12_ERR),
  82                sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
  83         pr_err(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
  84                sdhci_readl(host, SDHCI_CAPABILITIES),
  85                sdhci_readl(host, SDHCI_CAPABILITIES_1));
  86         pr_err(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
  87                sdhci_readw(host, SDHCI_COMMAND),
  88                sdhci_readl(host, SDHCI_MAX_CURRENT));
  89         pr_err(DRIVER_NAME ": Host ctl2: 0x%08x\n",
  90                sdhci_readw(host, SDHCI_HOST_CONTROL2));
  91
  92         if (host->flags & SDHCI_USE_ADMA) {
  93                 if (host->flags & SDHCI_USE_64_BIT_DMA)
  94                         pr_err(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
  95                                readl(host->ioaddr + SDHCI_ADMA_ERROR),
  96                                readl(host->ioaddr + SDHCI_ADMA_ADDRESS_HI),
  97                                readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
  98                 else
  99                         pr_err(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
 100                                readl(host->ioaddr + SDHCI_ADMA_ERROR),
 101                                readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
 102         }
 103
 104         pr_err(DRIVER_NAME ": ===========================================\n");
 105 }
 106
 107 /*****************************************************************************\
 108  *                                                                           *
 109  * Low level functions                                                       *
 110  *                                                                           *
 111 \*****************************************************************************/
 112
 113 static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
 114 {
 115         return cmd->data || cmd->flags & MMC_RSP_BUSY;
 116 }
 117
 118 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
 119 {
 120         u32 present;
 121
 122         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
 123             !mmc_card_is_removable(host->mmc))
 124                 return;
 125
 126         if (enable) {
 127                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
 128                                       SDHCI_CARD_PRESENT;
 129
 130                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
 131                                        SDHCI_INT_CARD_INSERT;
 132         } else {
 133                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
 134         }
 135
 136         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 137         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 138 }
 139
 140 static void sdhci_enable_card_detection(struct sdhci_host *host)
 141 {
 142         sdhci_set_card_detection(host, true);
 143 }
 144
 145 static void sdhci_disable_card_detection(struct sdhci_host *host)
 146 {
 147         sdhci_set_card_detection(host, false);
 148 }
 149
 150 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 151 {
 152         if (host->bus_on)
 153                 return;
 154         host->bus_on = true;
 155         pm_runtime_get_noresume(host->mmc->parent);
 156 }
 157
 158 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 159 {
 160         if (!host->bus_on)
 161                 return;
 162         host->bus_on = false;
 163         pm_runtime_put_noidle(host->mmc->parent);
 164 }
 165
 166 void sdhci_reset(struct sdhci_host *host, u8 mask)
 167 {
 168         unsigned long timeout;
 169
 170         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 171
 172         if (mask & SDHCI_RESET_ALL) {
 173                 host->clock = 0;
 174                 /* Reset-all turns off SD Bus Power */
 175                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
 176                         sdhci_runtime_pm_bus_off(host);
 177         }
 178
 179         /* Wait max 100 ms */
 180         timeout = 100;
 181
 182         /* hw clears the bit when it's done */
 183         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
 184                 if (timeout == 0) {
 185                         pr_err("%s: Reset 0x%x never completed.\n",
 186                                 mmc_hostname(host->mmc), (int)mask);
 187                         sdhci_dumpregs(host);
 188                         return;
 189                 }
 190                 timeout--;
 191                 mdelay(1);
 192         }
 193 }
 194 EXPORT_SYMBOL_GPL(sdhci_reset);
 195
 196 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
 197 {
 198         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 199                 struct mmc_host *mmc = host->mmc;
 200
 201                 if (!mmc->ops->get_cd(mmc))
 202                         return;
 203         }
 204
 205         host->ops->reset(host, mask);
 206
 207         if (mask & SDHCI_RESET_ALL) {
 208                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 209                         if (host->ops->enable_dma)
 210                                 host->ops->enable_dma(host);
 211                 }
 212
 213                 /* Resetting the controller clears many */
 214                 host->preset_enabled = false;
 215         }
 216 }
 217
 218 static void sdhci_init(struct sdhci_host *host, int soft)
 219 {
 220         struct mmc_host *mmc = host->mmc;
 221
 222         if (soft)
 223                 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
 224         else
 225                 sdhci_do_reset(host, SDHCI_RESET_ALL);
 226
 227         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 228                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
 229                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
 230                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
 231                     SDHCI_INT_RESPONSE;
 232
 233         if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
 234             host->tuning_mode == SDHCI_TUNING_MODE_3)
 235                 host->ier |= SDHCI_INT_RETUNE;
 236
 237         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 238         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 239
 240         if (soft) {
 241                 /* force clock reconfiguration */
 242                 host->clock = 0;
 243                 mmc->ops->set_ios(mmc, &mmc->ios);
 244         }
 245 }
 246
 247 static void sdhci_reinit(struct sdhci_host *host)
 248 {
 249         sdhci_init(host, 0);
 250         sdhci_enable_card_detection(host);
 251 }
 252
 253 static void __sdhci_led_activate(struct sdhci_host *host)
 254 {
 255         u8 ctrl;
 256
 257         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 258         ctrl |= SDHCI_CTRL_LED;
 259         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 260 }
 261
 262 static void __sdhci_led_deactivate(struct sdhci_host *host)
 263 {
 264         u8 ctrl;
 265
 266         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 267         ctrl &= ~SDHCI_CTRL_LED;
 268         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 269 }
 270
 271 #if IS_REACHABLE(CONFIG_LEDS_CLASS)
 272 static void sdhci_led_control(struct led_classdev *led,
 273                               enum led_brightness brightness)
 274 {
 275         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 276         unsigned long flags;
 277
 278         spin_lock_irqsave(&host->lock, flags);
 279
 280         if (host->runtime_suspended)
 281                 goto out;
 282
 283         if (brightness == LED_OFF)
 284                 __sdhci_led_deactivate(host);
 285         else
 286                 __sdhci_led_activate(host);
 287 out:
 288         spin_unlock_irqrestore(&host->lock, flags);
 289 }
 290
 291 static int sdhci_led_register(struct sdhci_host *host)
 292 {
 293         struct mmc_host *mmc = host->mmc;
 294
 295         snprintf(host->led_name, sizeof(host->led_name),
 296                  "%s::", mmc_hostname(mmc));
 297
 298         host->led.name = host->led_name;
 299         host->led.brightness = LED_OFF;
 300         host->led.default_trigger = mmc_hostname(mmc);
 301         host->led.brightness_set = sdhci_led_control;
 302
 303         return led_classdev_register(mmc_dev(mmc), &host->led);
 304 }
 305
 306 static void sdhci_led_unregister(struct sdhci_host *host)
 307 {
 308         led_classdev_unregister(&host->led);
 309 }
 310
 311 static inline void sdhci_led_activate(struct sdhci_host *host)
 312 {
 313 }
 314
 315 static inline void sdhci_led_deactivate(struct sdhci_host *host)
 316 {
 317 }
 318
 319 #else
 320
 321 static inline int sdhci_led_register(struct sdhci_host *host)
 322 {
 323         return 0;
 324 }
 325
 326 static inline void sdhci_led_unregister(struct sdhci_host *host)
 327 {
 328 }
 329
 330 static inline void sdhci_led_activate(struct sdhci_host *host)
 331 {
 332         __sdhci_led_activate(host);
 333 }
 334
 335 static inline void sdhci_led_deactivate(struct sdhci_host *host)
 336 {
 337         __sdhci_led_deactivate(host);
 338 }
 339
 340 #endif
 341
 342 /*****************************************************************************\
 343  *                                                                           *
 344  * Core functions                                                            *
 345  *                                                                           *
 346 \*****************************************************************************/
 347
 348 static void sdhci_read_block_pio(struct sdhci_host *host)
 349 {
 350         unsigned long flags;
 351         size_t blksize, len, chunk;
 352         u32 uninitialized_var(scratch);
 353         u8 *buf;
 354
 355         DBG("PIO reading\n");
 356
 357         blksize = host->data->blksz;
 358         chunk = 0;
 359
 360         local_irq_save(flags);
 361
 362         while (blksize) {
 363                 BUG_ON(!sg_miter_next(&host->sg_miter));
 364
 365                 len = min(host->sg_miter.length, blksize);
 366
 367                 blksize -= len;
 368                 host->sg_miter.consumed = len;
 369
 370                 buf = host->sg_miter.addr;
 371
 372                 while (len) {
 373                         if (chunk == 0) {
 374                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
 375                                 chunk = 4;
 376                         }
 377
 378                         *buf = scratch & 0xFF;
 379
 380                         buf++;
 381                         scratch >>= 8;
 382                         chunk--;
 383                         len--;
 384                 }
 385         }
 386
 387         sg_miter_stop(&host->sg_miter);
 388
 389         local_irq_restore(flags);
 390 }
 391
 392 static void sdhci_write_block_pio(struct sdhci_host *host)
 393 {
 394         unsigned long flags;
 395         size_t blksize, len, chunk;
 396         u32 scratch;
 397         u8 *buf;
 398
 399         DBG("PIO writing\n");
 400
 401         blksize = host->data->blksz;
 402         chunk = 0;
 403         scratch = 0;
 404
 405         local_irq_save(flags);
 406
 407         while (blksize) {
 408                 BUG_ON(!sg_miter_next(&host->sg_miter));
 409
 410                 len = min(host->sg_miter.length, blksize);
 411
 412                 blksize -= len;
 413                 host->sg_miter.consumed = len;
 414
 415                 buf = host->sg_miter.addr;
 416
 417                 while (len) {
 418                         scratch |= (u32)*buf << (chunk * 8);
 419
 420                         buf++;
 421                         chunk++;
 422                         len--;
 423
 424                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 425                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
 426                                 chunk = 0;
 427                                 scratch = 0;
 428                         }
 429                 }
 430         }
 431
 432         sg_miter_stop(&host->sg_miter);
 433
 434         local_irq_restore(flags);
 435 }
 436
 437 static void sdhci_transfer_pio(struct sdhci_host *host)
 438 {
 439         u32 mask;
 440
 441         if (host->blocks == 0)
 442                 return;
 443
 444         if (host->data->flags & MMC_DATA_READ)
 445                 mask = SDHCI_DATA_AVAILABLE;
 446         else
 447                 mask = SDHCI_SPACE_AVAILABLE;
 448
 449         /*
 450          * Some controllers (JMicron JMB38x) mess up the buffer bits
 451          * for transfers < 4 bytes. As long as it is just one block,
 452          * we can ignore the bits.
 453          */
 454         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
 455                 (host->data->blocks == 1))
 456                 mask = ~0;
 457
 458         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 459                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 460                         udelay(100);
 461
 462                 if (host->data->flags & MMC_DATA_READ)
 463                         sdhci_read_block_pio(host);
 464                 else
 465                         sdhci_write_block_pio(host);
 466
 467                 host->blocks--;
 468                 if (host->blocks == 0)
 469                         break;
 470         }
 471
 472         DBG("PIO transfer complete.\n");
 473 }
 474
 475 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
 476                                   struct mmc_data *data, int cookie)
 477 {
 478         int sg_count;
 479
 480         /*
 481          * If the data buffers are already mapped, return the previous
 482          * dma_map_sg() result.
 483          */
 484         if (data->host_cookie == COOKIE_PRE_MAPPED)
 485                 return data->sg_count;
 486
 487         sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 488                                 data->flags & MMC_DATA_WRITE ?
 489                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
 490
 491         if (sg_count == 0)
 492                 return -ENOSPC;
 493
 494         data->sg_count = sg_count;
 495         data->host_cookie = cookie;
 496
 497         return sg_count;
 498 }
 499
 500 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 501 {
 502         local_irq_save(*flags);
 503         return kmap_atomic(sg_page(sg)) + sg->offset;
 504 }
 505
 506 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 507 {
 508         kunmap_atomic(buffer);
 509         local_irq_restore(*flags);
 510 }
 511
 512 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
 513                                   dma_addr_t addr, int len, unsigned cmd)
 514 {
 515         struct sdhci_adma2_64_desc *dma_desc = desc;
 516
 517         /* 32-bit and 64-bit descriptors have these members in same position */
 518         dma_desc->cmd = cpu_to_le16(cmd);
 519         dma_desc->len = cpu_to_le16(len);
 520         dma_desc->addr_lo = cpu_to_le32((u32)addr);
 521
 522         if (host->flags & SDHCI_USE_64_BIT_DMA)
 523                 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
 524 }
 525
 526 static void sdhci_adma_mark_end(void *desc)
 527 {
 528         struct sdhci_adma2_64_desc *dma_desc = desc;
 529
 530         /* 32-bit and 64-bit descriptors have 'cmd' in same position */
 531         dma_desc->cmd |= cpu_to_le16(ADMA2_END);
 532 }
 533
 534 static void sdhci_adma_table_pre(struct sdhci_host *host,
 535         struct mmc_data *data, int sg_count)
 536 {
 537         struct scatterlist *sg;
 538         unsigned long flags;
 539         dma_addr_t addr, align_addr;
 540         void *desc, *align;
 541         char *buffer;
 542         int len, offset, i;
 543
 544         /*
 545          * The spec does not specify endianness of descriptor table.
 546          * We currently guess that it is LE.
 547          */
 548
 549         host->sg_count = sg_count;
 550
 551         desc = host->adma_table;
 552         align = host->align_buffer;
 553
 554         align_addr = host->align_addr;
 555
 556         for_each_sg(data->sg, sg, host->sg_count, i) {
 557                 addr = sg_dma_address(sg);
 558                 len = sg_dma_len(sg);
 559
 560                 /*
 561                  * The SDHCI specification states that ADMA addresses must
 562                  * be 32-bit aligned. If they aren't, then we use a bounce
 563                  * buffer for the (up to three) bytes that screw up the
 564                  * alignment.
 565                  */
 566                 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
 567                          SDHCI_ADMA2_MASK;
 568                 if (offset) {
 569                         if (data->flags & MMC_DATA_WRITE) {
 570                                 buffer = sdhci_kmap_atomic(sg, &flags);
 571                                 memcpy(align, buffer, offset);
 572                                 sdhci_kunmap_atomic(buffer, &flags);
 573                         }
 574
 575                         /* tran, valid */
 576                         sdhci_adma_write_desc(host, desc, align_addr, offset,
 577                                               ADMA2_TRAN_VALID);
 578
 579                         BUG_ON(offset > 65536);
 580
 581                         align += SDHCI_ADMA2_ALIGN;
 582                         align_addr += SDHCI_ADMA2_ALIGN;
 583
 584                         desc += host->desc_sz;
 585
 586                         addr += offset;
 587                         len -= offset;
 588                 }
 589
 590                 BUG_ON(len > 65536);
 591
 592                 if (len) {
 593                         /* tran, valid */
 594                         sdhci_adma_write_desc(host, desc, addr, len,
 595                                               ADMA2_TRAN_VALID);
 596                         desc += host->desc_sz;
 597                 }
 598
 599                 /*
 600                  * If this triggers then we have a calculation bug
 601                  * somewhere. :/
 602                  */
 603                 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
 604         }
 605
 606         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
 607                 /* Mark the last descriptor as the terminating descriptor */
 608                 if (desc != host->adma_table) {
 609                         desc -= host->desc_sz;
 610                         sdhci_adma_mark_end(desc);
 611                 }
 612         } else {
 613                 /* Add a terminating entry - nop, end, valid */
 614                 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
 615         }
 616 }
 617
 618 static void sdhci_adma_table_post(struct sdhci_host *host,
 619         struct mmc_data *data)
 620 {
 621         struct scatterlist *sg;
 622         int i, size;
 623         void *align;
 624         char *buffer;
 625         unsigned long flags;
 626
 627         if (data->flags & MMC_DATA_READ) {
 628                 bool has_unaligned = false;
 629
 630                 /* Do a quick scan of the SG list for any unaligned mappings */
 631                 for_each_sg(data->sg, sg, host->sg_count, i)
 632                         if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 633                                 has_unaligned = true;
 634                                 break;
 635                         }
 636
 637                 if (has_unaligned) {
 638                         dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 639                                             data->sg_len, DMA_FROM_DEVICE);
 640
 641                         align = host->align_buffer;
 642
 643                         for_each_sg(data->sg, sg, host->sg_count, i) {
 644                                 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 645                                         size = SDHCI_ADMA2_ALIGN -
 646                                                (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
 647
 648                                         buffer = sdhci_kmap_atomic(sg, &flags);
 649                                         memcpy(buffer, align, size);
 650                                         sdhci_kunmap_atomic(buffer, &flags);
 651
 652                                         align += SDHCI_ADMA2_ALIGN;
 653                                 }
 654                         }
 655                 }
 656         }
 657 }
 658
 659 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 660 {
 661         u8 count;
 662         struct mmc_data *data = cmd->data;
 663         unsigned target_timeout, current_timeout;
 664
 665         /*
 666          * If the host controller provides us with an incorrect timeout
 667          * value, just skip the check and use 0xE.  The hardware may take
 668          * longer to time out, but that's much better than having a too-short
 669          * timeout value.
 670          */
 671         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
 672                 return 0xE;
 673
 674         /* Unspecified timeout, assume max */
 675         if (!data && !cmd->busy_timeout)
 676                 return 0xE;
 677
 678         /* timeout in us */
 679         if (!data)
 680                 target_timeout = cmd->busy_timeout * 1000;
 681         else {
 682                 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
 683                 if (host->clock && data->timeout_clks) {
 684                         unsigned long long val;
 685
 686                         /*
 687                          * data->timeout_clks is in units of clock cycles.
 688                          * host->clock is in Hz.  target_timeout is in us.
 689                          * Hence, us = 1000000 * cycles / Hz.  Round up.
 690                          */
 691                         val = 1000000ULL * data->timeout_clks;
 692                         if (do_div(val, host->clock))
 693                                 target_timeout++;
 694                         target_timeout += val;
 695                 }
 696         }
 697
 698         /*
 699          * Figure out needed cycles.
 700          * We do this in steps in order to fit inside a 32 bit int.
 701          * The first step is the minimum timeout, which will have a
 702          * minimum resolution of 6 bits:
 703          * (1) 2^13*1000 > 2^22,
 704          * (2) host->timeout_clk < 2^16
 705          *     =>
 706          *     (1) / (2) > 2^6
 707          */
 708         count = 0;
 709         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 710         while (current_timeout < target_timeout) {
 711                 count++;
 712                 current_timeout <<= 1;
 713                 if (count >= 0xF)
 714                         break;
 715         }
 716
 717         if (count >= 0xF) {
 718                 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
 719                     mmc_hostname(host->mmc), count, cmd->opcode);
 720                 count = 0xE;
 721         }
 722
 723         return count;
 724 }
 725
 726 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 727 {
 728         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 729         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 730
 731         if (host->flags & SDHCI_REQ_USE_DMA)
 732                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
 733         else
 734                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
 735
 736         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 737         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 738 }
 739
 740 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 741 {
 742         u8 count;
 743
 744         if (host->ops->set_timeout) {
 745                 host->ops->set_timeout(host, cmd);
 746         } else {
 747                 count = sdhci_calc_timeout(host, cmd);
 748                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
 749         }
 750 }
 751
 752 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 753 {
 754         u8 ctrl;
 755         struct mmc_data *data = cmd->data;
 756
 757         if (sdhci_data_line_cmd(cmd))
 758                 sdhci_set_timeout(host, cmd);
 759
 760         if (!data)
 761                 return;
 762
 763         WARN_ON(host->data);
 764
 765         /* Sanity checks */
 766         BUG_ON(data->blksz * data->blocks > 524288);
 767         BUG_ON(data->blksz > host->mmc->max_blk_size);
 768         BUG_ON(data->blocks > 65535);
 769
 770         host->data = data;
 771         host->data_early = 0;
 772         host->data->bytes_xfered = 0;
 773
 774         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 775                 struct scatterlist *sg;
 776                 unsigned int length_mask, offset_mask;
 777                 int i;
 778
 779                 host->flags |= SDHCI_REQ_USE_DMA;
 780
 781                 /*
 782                  * FIXME: This doesn't account for merging when mapping the
 783                  * scatterlist.
 784                  *
 785                  * The assumption here being that alignment and lengths are
 786                  * the same after DMA mapping to device address space.
 787                  */
 788                 length_mask = 0;
 789                 offset_mask = 0;
 790                 if (host->flags & SDHCI_USE_ADMA) {
 791                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
 792                                 length_mask = 3;
 793                                 /*
 794                                  * As we use up to 3 byte chunks to work
 795                                  * around alignment problems, we need to
 796                                  * check the offset as well.
 797                                  */
 798                                 offset_mask = 3;
 799                         }
 800                 } else {
 801                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
 802                                 length_mask = 3;
 803                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
 804                                 offset_mask = 3;
 805                 }
 806
 807                 if (unlikely(length_mask | offset_mask)) {
 808                         for_each_sg(data->sg, sg, data->sg_len, i) {
 809                                 if (sg->length & length_mask) {
 810                                         DBG("Reverting to PIO because of transfer size (%d)\n",
 811                                             sg->length);
 812                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 813                                         break;
 814                                 }
 815                                 if (sg->offset & offset_mask) {
 816                                         DBG("Reverting to PIO because of bad alignment\n");
 817                                         host->flags &= ~SDHCI_REQ_USE_DMA;
 818                                         break;
 819                                 }
 820                         }
 821                 }
 822         }
 823
 824         if (host->flags & SDHCI_REQ_USE_DMA) {
 825                 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
 826
 827                 if (sg_cnt <= 0) {
 828                         /*
 829                          * This only happens when someone fed
 830                          * us an invalid request.
 831                          */
 832                         WARN_ON(1);
 833                         host->flags &= ~SDHCI_REQ_USE_DMA;
 834                 } else if (host->flags & SDHCI_USE_ADMA) {
 835                         sdhci_adma_table_pre(host, data, sg_cnt);
 836
 837                         sdhci_writel(host, host->adma_addr, SDHCI_ADMA_ADDRESS);
 838                         if (host->flags & SDHCI_USE_64_BIT_DMA)
 839                                 sdhci_writel(host,
 840                                              (u64)host->adma_addr >> 32,
 841                                              SDHCI_ADMA_ADDRESS_HI);
 842                 } else {
 843                         WARN_ON(sg_cnt != 1);
 844                         sdhci_writel(host, sg_dma_address(data->sg),
 845                                 SDHCI_DMA_ADDRESS);
 846                 }
 847         }
 848
 849         /*
 850          * Always adjust the DMA selection as some controllers
 851          * (e.g. JMicron) can't do PIO properly when the selection
 852          * is ADMA.
 853          */
 854         if (host->version >= SDHCI_SPEC_200) {
 855                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 856                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
 857                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
 858                         (host->flags & SDHCI_USE_ADMA)) {
 859                         if (host->flags & SDHCI_USE_64_BIT_DMA)
 860                                 ctrl |= SDHCI_CTRL_ADMA64;
 861                         else
 862                                 ctrl |= SDHCI_CTRL_ADMA32;
 863                 } else {
 864                         ctrl |= SDHCI_CTRL_SDMA;
 865                 }
 866                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 867         }
 868
 869         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
 870                 int flags;
 871
 872                 flags = SG_MITER_ATOMIC;
 873                 if (host->data->flags & MMC_DATA_READ)
 874                         flags |= SG_MITER_TO_SG;
 875                 else
 876                         flags |= SG_MITER_FROM_SG;
 877                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
 878                 host->blocks = data->blocks;
 879         }
 880
 881         sdhci_set_transfer_irqs(host);
 882
 883         /* Set the DMA boundary value and block size */
 884         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 885                 data->blksz), SDHCI_BLOCK_SIZE);
 886         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 887 }
 888
 889 static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
 890                                     struct mmc_request *mrq)
 891 {
 892         return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
 893                !mrq->cap_cmd_during_tfr;
 894 }
 895
 896 static void sdhci_set_transfer_mode(struct sdhci_host *host,
 897         struct mmc_command *cmd)
 898 {
 899         u16 mode = 0;
 900         struct mmc_data *data = cmd->data;
 901
 902         if (data == NULL) {
 903                 if (host->quirks2 &
 904                         SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
 905                         sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
 906                 } else {
 907                 /* clear Auto CMD settings for no data CMDs */
 908                         mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
 909                         sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
 910                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
 911                 }
 912                 return;
 913         }
 914
 915         WARN_ON(!host->data);
 916
 917         if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
 918                 mode = SDHCI_TRNS_BLK_CNT_EN;
 919
 920         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
 921                 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
 922                 /*
 923                  * If we are sending CMD23, CMD12 never gets sent
 924                  * on successful completion (so no Auto-CMD12).
 925                  */
 926                 if (sdhci_auto_cmd12(host, cmd->mrq) &&
 927                     (cmd->opcode != SD_IO_RW_EXTENDED))
 928                         mode |= SDHCI_TRNS_AUTO_CMD12;
 929                 else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
 930                         mode |= SDHCI_TRNS_AUTO_CMD23;
 931                         sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
 932                 }
 933         }
 934
 935         if (data->flags & MMC_DATA_READ)
 936                 mode |= SDHCI_TRNS_READ;
 937         if (host->flags & SDHCI_REQ_USE_DMA)
 938                 mode |= SDHCI_TRNS_DMA;
 939
 940         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 941 }
 942
 943 static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
 944 {
 945         return (!(host->flags & SDHCI_DEVICE_DEAD) &&
 946                 ((mrq->cmd && mrq->cmd->error) ||
 947                  (mrq->sbc && mrq->sbc->error) ||
 948                  (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
 949                                 (mrq->data->stop && mrq->data->stop->error))) ||
 950                  (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
 951 }
 952
 953 static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
 954 {
 955         int i;
 956
 957         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
 958                 if (host->mrqs_done[i] == mrq) {
 959                         WARN_ON(1);
 960                         return;
 961                 }
 962         }
 963
 964         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
 965                 if (!host->mrqs_done[i]) {
 966                         host->mrqs_done[i] = mrq;
 967                         break;
 968                 }
 969         }
 970
 971         WARN_ON(i >= SDHCI_MAX_MRQS);
 972
 973         tasklet_schedule(&host->finish_tasklet);
 974 }
 975
 976 static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
 977 {
 978         if (host->cmd && host->cmd->mrq == mrq)
 979                 host->cmd = NULL;
 980
 981         if (host->data_cmd && host->data_cmd->mrq == mrq)
 982                 host->data_cmd = NULL;
 983
 984         if (host->data && host->data->mrq == mrq)
 985                 host->data = NULL;
 986
 987         if (sdhci_needs_reset(host, mrq))
 988                 host->pending_reset = true;
 989
 990         __sdhci_finish_mrq(host, mrq);
 991 }
 992
 993 static void sdhci_finish_data(struct sdhci_host *host)
 994 {
 995         struct mmc_command *data_cmd = host->data_cmd;
 996         struct mmc_data *data = host->data;
 997
 998         host->data = NULL;
 999         host->data_cmd = NULL;
1000
1001         if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1002             (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1003                 sdhci_adma_table_post(host, data);
1004
1005         /*
1006          * The specification states that the block count register must
1007          * be updated, but it does not specify at what point in the
1008          * data flow. That makes the register entirely useless to read
1009          * back so we have to assume that nothing made it to the card
1010          * in the event of an error.
1011          */
1012         if (data->error)
1013                 data->bytes_xfered = 0;
1014         else
1015                 data->bytes_xfered = data->blksz * data->blocks;
1016
1017         /*
1018          * Need to send CMD12 if -
1019          * a) open-ended multiblock transfer (no CMD23)
1020          * b) error in multiblock transfer
1021          */
1022         if (data->stop &&
1023             (data->error ||
1024              !data->mrq->sbc)) {
1025
1026                 /*
1027                  * The controller needs a reset of internal state machines
1028                  * upon error conditions.
1029                  */
1030                 if (data->error) {
1031                         if (!host->cmd || host->cmd == data_cmd)
1032                                 sdhci_do_reset(host, SDHCI_RESET_CMD);
1033                         sdhci_do_reset(host, SDHCI_RESET_DATA);
1034                 }
1035
1036                 /*
1037                  * 'cap_cmd_during_tfr' request must not use the command line
1038                  * after mmc_command_done() has been called. It is upper layer's
1039                  * responsibility to send the stop command if required.
1040                  */
1041                 if (data->mrq->cap_cmd_during_tfr) {
1042                         sdhci_finish_mrq(host, data->mrq);
1043                 } else {
1044                         /* Avoid triggering warning in sdhci_send_command() */
1045                         host->cmd = NULL;
1046                         sdhci_send_command(host, data->stop);
1047                 }
1048         } else {
1049                 sdhci_finish_mrq(host, data->mrq);
1050         }
1051 }
1052
1053 static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
1054                             unsigned long timeout)
1055 {
1056         if (sdhci_data_line_cmd(mrq->cmd))
1057                 mod_timer(&host->data_timer, timeout);
1058         else
1059                 mod_timer(&host->timer, timeout);
1060 }
1061
1062 static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
1063 {
1064         if (sdhci_data_line_cmd(mrq->cmd))
1065                 del_timer(&host->data_timer);
1066         else
1067                 del_timer(&host->timer);
1068 }
1069
1070 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1071 {
1072         int flags;
1073         u32 mask;
1074         unsigned long timeout;
1075
1076         WARN_ON(host->cmd);
1077
1078         /* Initially, a command has no error */
1079         cmd->error = 0;
1080
1081         if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1082             cmd->opcode == MMC_STOP_TRANSMISSION)
1083                 cmd->flags |= MMC_RSP_BUSY;
1084
1085         /* Wait max 10 ms */
1086         timeout = 10;
1087
1088         mask = SDHCI_CMD_INHIBIT;
1089         if (sdhci_data_line_cmd(cmd))
1090                 mask |= SDHCI_DATA_INHIBIT;
1091
1092         /* We shouldn't wait for data inihibit for stop commands, even
1093            though they might use busy signaling */
1094         if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1095                 mask &= ~SDHCI_DATA_INHIBIT;
1096
1097         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1098                 if (timeout == 0) {
1099                         pr_err("%s: Controller never released inhibit bit(s).\n",
1100                                mmc_hostname(host->mmc));
1101                         sdhci_dumpregs(host);
1102                         cmd->error = -EIO;
1103                         sdhci_finish_mrq(host, cmd->mrq);
1104                         return;
1105                 }
1106                 timeout--;
1107                 mdelay(1);
1108         }
1109
1110         timeout = jiffies;
1111         if (!cmd->data && cmd->busy_timeout > 9000)
1112                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1113         else
1114                 timeout += 10 * HZ;
1115         sdhci_mod_timer(host, cmd->mrq, timeout);
1116
1117         host->cmd = cmd;
1118         if (sdhci_data_line_cmd(cmd)) {
1119                 WARN_ON(host->data_cmd);
1120                 host->data_cmd = cmd;
1121         }
1122
1123         sdhci_prepare_data(host, cmd);
1124
1125         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1126
1127         sdhci_set_transfer_mode(host, cmd);
1128
1129         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1130                 pr_err("%s: Unsupported response type!\n",
1131                         mmc_hostname(host->mmc));
1132                 cmd->error = -EINVAL;
1133                 sdhci_finish_mrq(host, cmd->mrq);
1134                 return;
1135         }
1136
1137         if (!(cmd->flags & MMC_RSP_PRESENT))
1138                 flags = SDHCI_CMD_RESP_NONE;
1139         else if (cmd->flags & MMC_RSP_136)
1140                 flags = SDHCI_CMD_RESP_LONG;
1141         else if (cmd->flags & MMC_RSP_BUSY)
1142                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1143         else
1144                 flags = SDHCI_CMD_RESP_SHORT;
1145
1146         if (cmd->flags & MMC_RSP_CRC)
1147                 flags |= SDHCI_CMD_CRC;
1148         if (cmd->flags & MMC_RSP_OPCODE)
1149                 flags |= SDHCI_CMD_INDEX;
1150
1151         /* CMD19 is special in that the Data Present Select should be set */
1152         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1153             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1154                 flags |= SDHCI_CMD_DATA;
1155
1156         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1157 }
1158 EXPORT_SYMBOL_GPL(sdhci_send_command);
1159
1160 static void sdhci_finish_command(struct sdhci_host *host)
1161 {
1162         struct mmc_command *cmd = host->cmd;
1163         int i;
1164
1165         host->cmd = NULL;
1166
1167         if (cmd->flags & MMC_RSP_PRESENT) {
1168                 if (cmd->flags & MMC_RSP_136) {
1169                         /* CRC is stripped so we need to do some shifting. */
1170                         for (i = 0;i < 4;i++) {
1171                                 cmd->resp[i] = sdhci_readl(host,
1172                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1173                                 if (i != 3)
1174                                         cmd->resp[i] |=
1175                                                 sdhci_readb(host,
1176                                                 SDHCI_RESPONSE + (3-i)*4-1);
1177                         }
1178                 } else {
1179                         cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1180                 }
1181         }
1182
1183         if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1184                 mmc_command_done(host->mmc, cmd->mrq);
1185
1186         /*
1187          * The host can send and interrupt when the busy state has
1188          * ended, allowing us to wait without wasting CPU cycles.
1189          * The busy signal uses DAT0 so this is similar to waiting
1190          * for data to complete.
1191          *
1192          * Note: The 1.0 specification is a bit ambiguous about this
1193          *       feature so there might be some problems with older
1194          *       controllers.
1195          */
1196         if (cmd->flags & MMC_RSP_BUSY) {
1197                 if (cmd->data) {
1198                         DBG("Cannot wait for busy signal when also doing a data transfer");
1199                 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1200                            cmd == host->data_cmd) {
1201                         /* Command complete before busy is ended */
1202                         return;
1203                 }
1204         }
1205
1206         /* Finished CMD23, now send actual command. */
1207         if (cmd == cmd->mrq->sbc) {
1208                 sdhci_send_command(host, cmd->mrq->cmd);
1209         } else {
1210
1211                 /* Processed actual command. */
1212                 if (host->data && host->data_early)
1213                         sdhci_finish_data(host);
1214
1215                 if (!cmd->data)
1216                         sdhci_finish_mrq(host, cmd->mrq);
1217         }
1218 }
1219
1220 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1221 {
1222         u16 preset = 0;
1223
1224         switch (host->timing) {
1225         case MMC_TIMING_UHS_SDR12:
1226                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1227                 break;
1228         case MMC_TIMING_UHS_SDR25:
1229                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1230                 break;
1231         case MMC_TIMING_UHS_SDR50:
1232                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1233                 break;
1234         case MMC_TIMING_UHS_SDR104:
1235         case MMC_TIMING_MMC_HS200:
1236                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1237                 break;
1238         case MMC_TIMING_UHS_DDR50:
1239         case MMC_TIMING_MMC_DDR52:
1240                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1241                 break;
1242         case MMC_TIMING_MMC_HS400:
1243                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1244                 break;
1245         default:
1246                 pr_warn("%s: Invalid UHS-I mode selected\n",
1247                         mmc_hostname(host->mmc));
1248                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1249                 break;
1250         }
1251         return preset;
1252 }
1253
1254 u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1255                    unsigned int *actual_clock)
1256 {
1257         int div = 0; /* Initialized for compiler warning */
1258         int real_div = div, clk_mul = 1;
1259         u16 clk = 0;
1260         bool switch_base_clk = false;
1261
1262         if (host->version >= SDHCI_SPEC_300) {
1263                 if (host->preset_enabled) {
1264                         u16 pre_val;
1265
1266                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1267                         pre_val = sdhci_get_preset_value(host);
1268                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1269                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1270                         if (host->clk_mul &&
1271                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1272                                 clk = SDHCI_PROG_CLOCK_MODE;
1273                                 real_div = div + 1;
1274                                 clk_mul = host->clk_mul;
1275                         } else {
1276                                 real_div = max_t(int, 1, div << 1);
1277                         }
1278                         goto clock_set;
1279                 }
1280
1281                 /*
1282                  * Check if the Host Controller supports Programmable Clock
1283                  * Mode.
1284                  */
1285                 if (host->clk_mul) {
1286                         for (div = 1; div <= 1024; div++) {
1287                                 if ((host->max_clk * host->clk_mul / div)
1288                                         <= clock)
1289                                         break;
1290                         }
1291                         if ((host->max_clk * host->clk_mul / div) <= clock) {
1292                                 /*
1293                                  * Set Programmable Clock Mode in the Clock
1294                                  * Control register.
1295                                  */
1296                                 clk = SDHCI_PROG_CLOCK_MODE;
1297                                 real_div = div;
1298                                 clk_mul = host->clk_mul;
1299                                 div--;
1300                         } else {
1301                                 /*
1302                                  * Divisor can be too small to reach clock
1303                                  * speed requirement. Then use the base clock.
1304                                  */
1305                                 switch_base_clk = true;
1306                         }
1307                 }
1308
1309                 if (!host->clk_mul || switch_base_clk) {
1310                         /* Version 3.00 divisors must be a multiple of 2. */
1311                         if (host->max_clk <= clock)
1312                                 div = 1;
1313                         else {
1314                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1315                                      div += 2) {
1316                                         if ((host->max_clk / div) <= clock)
1317                                                 break;
1318                                 }
1319                         }
1320                         real_div = div;
1321                         div >>= 1;
1322                         if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1323                                 && !div && host->max_clk <= 25000000)
1324                                 div = 1;
1325                 }
1326         } else {
1327                 /* Version 2.00 divisors must be a power of 2. */
1328                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1329                         if ((host->max_clk / div) <= clock)
1330                                 break;
1331                 }
1332                 real_div = div;
1333                 div >>= 1;
1334         }
1335
1336 clock_set:
1337         if (real_div)
1338                 *actual_clock = (host->max_clk * clk_mul) / real_div;
1339         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1340         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1341                 << SDHCI_DIVIDER_HI_SHIFT;
1342
1343         return clk;
1344 }
1345 EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1346
1347 void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1348 {
1349         unsigned long timeout;
1350
1351         clk |= SDHCI_CLOCK_INT_EN;
1352         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1353
1354         /* Wait max 20 ms */
1355         timeout = 20;
1356         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1357                 & SDHCI_CLOCK_INT_STABLE)) {
1358                 if (timeout == 0) {
1359                         pr_err("%s: Internal clock never stabilised.\n",
1360                                mmc_hostname(host->mmc));
1361                         sdhci_dumpregs(host);
1362                         return;
1363                 }
1364                 timeout--;
1365                 spin_unlock_irq(&host->lock);
1366                 usleep_range(900, 1100);
1367                 spin_lock_irq(&host->lock);
1368         }
1369
1370         clk |= SDHCI_CLOCK_CARD_EN;
1371         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1372 }
1373 EXPORT_SYMBOL_GPL(sdhci_enable_clk);
1374
1375 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1376 {
1377         u16 clk;
1378
1379         host->mmc->actual_clock = 0;
1380
1381         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1382
1383         if (clock == 0)
1384                 return;
1385
1386         clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
1387         sdhci_enable_clk(host, clk);
1388 }
1389 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1390
1391 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
1392                                 unsigned short vdd)
1393 {
1394         struct mmc_host *mmc = host->mmc;
1395
1396         spin_unlock_irq(&host->lock);
1397         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1398         spin_lock_irq(&host->lock);
1399
1400         if (mode != MMC_POWER_OFF)
1401                 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1402         else
1403                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1404 }
1405
1406 void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
1407                            unsigned short vdd)
1408 {
1409         u8 pwr = 0;
1410
1411         if (mode != MMC_POWER_OFF) {
1412                 switch (1 << vdd) {
1413                 case MMC_VDD_165_195:
1414                         pwr = SDHCI_POWER_180;
1415                         break;
1416                 case MMC_VDD_29_30:
1417                 case MMC_VDD_30_31:
1418                         pwr = SDHCI_POWER_300;
1419                         break;
1420                 case MMC_VDD_32_33:
1421                 case MMC_VDD_33_34:
1422                         pwr = SDHCI_POWER_330;
1423                         break;
1424                 default:
1425                         WARN(1, "%s: Invalid vdd %#x\n",
1426                              mmc_hostname(host->mmc), vdd);
1427                         break;
1428                 }
1429         }
1430
1431         if (host->pwr == pwr)
1432                 return;
1433
1434         host->pwr = pwr;
1435
1436         if (pwr == 0) {
1437                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1438                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1439                         sdhci_runtime_pm_bus_off(host);
1440         } else {
1441                 /*
1442                  * Spec says that we should clear the power reg before setting
1443                  * a new value. Some controllers don't seem to like this though.
1444                  */
1445                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1446                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1447
1448                 /*
1449                  * At least the Marvell CaFe chip gets confused if we set the
1450                  * voltage and set turn on power at the same time, so set the
1451                  * voltage first.
1452                  */
1453                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1454                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1455
1456                 pwr |= SDHCI_POWER_ON;
1457
1458                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1459
1460                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1461                         sdhci_runtime_pm_bus_on(host);
1462
1463                 /*
1464                  * Some controllers need an extra 10ms delay of 10ms before
1465                  * they can apply clock after applying power
1466                  */
1467                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1468                         mdelay(10);
1469         }
1470 }
1471 EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
1472
1473 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1474                      unsigned short vdd)
1475 {
1476         if (IS_ERR(host->mmc->supply.vmmc))
1477                 sdhci_set_power_noreg(host, mode, vdd);
1478         else
1479                 sdhci_set_power_reg(host, mode, vdd);
1480 }
1481 EXPORT_SYMBOL_GPL(sdhci_set_power);
1482
1483 /*****************************************************************************\
1484  *                                                                           *
1485  * MMC callbacks                                                             *
1486  *                                                                           *
1487 \*****************************************************************************/
1488
1489 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1490 {
1491         struct sdhci_host *host;
1492         int present;
1493         unsigned long flags;
1494
1495         host = mmc_priv(mmc);
1496
1497         /* Firstly check card presence */
1498         present = mmc->ops->get_cd(mmc);
1499
1500         spin_lock_irqsave(&host->lock, flags);
1501
1502         sdhci_led_activate(host);
1503
1504         /*
1505          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1506          * requests if Auto-CMD12 is enabled.
1507          */
1508         if (sdhci_auto_cmd12(host, mrq)) {
1509                 if (mrq->stop) {
1510                         mrq->data->stop = NULL;
1511                         mrq->stop = NULL;
1512                 }
1513         }
1514
1515         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1516                 mrq->cmd->error = -ENOMEDIUM;
1517                 sdhci_finish_mrq(host, mrq);
1518         } else {
1519                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1520                         sdhci_send_command(host, mrq->sbc);
1521                 else
1522                         sdhci_send_command(host, mrq->cmd);
1523         }
1524
1525         mmiowb();
1526         spin_unlock_irqrestore(&host->lock, flags);
1527 }
1528
1529 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1530 {
1531         u8 ctrl;
1532
1533         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1534         if (width == MMC_BUS_WIDTH_8) {
1535                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1536                 if (host->version >= SDHCI_SPEC_300)
1537                         ctrl |= SDHCI_CTRL_8BITBUS;
1538         } else {
1539                 if (host->version >= SDHCI_SPEC_300)
1540                         ctrl &= ~SDHCI_CTRL_8BITBUS;
1541                 if (width == MMC_BUS_WIDTH_4)
1542                         ctrl |= SDHCI_CTRL_4BITBUS;
1543                 else
1544                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1545         }
1546         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1547 }
1548 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1549
1550 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1551 {
1552         u16 ctrl_2;
1553
1554         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1555         /* Select Bus Speed Mode for host */
1556         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1557         if ((timing == MMC_TIMING_MMC_HS200) ||
1558             (timing == MMC_TIMING_UHS_SDR104))
1559                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1560         else if (timing == MMC_TIMING_UHS_SDR12)
1561                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1562         else if (timing == MMC_TIMING_UHS_SDR25)
1563                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1564         else if (timing == MMC_TIMING_UHS_SDR50)
1565                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1566         else if ((timing == MMC_TIMING_UHS_DDR50) ||
1567                  (timing == MMC_TIMING_MMC_DDR52))
1568                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1569         else if (timing == MMC_TIMING_MMC_HS400)
1570                 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1571         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1572 }
1573 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1574
1575 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1576 {
1577         struct sdhci_host *host = mmc_priv(mmc);
1578         unsigned long flags;
1579         u8 ctrl;
1580
1581         if (ios->power_mode == MMC_POWER_UNDEFINED)
1582                 return;
1583
1584         spin_lock_irqsave(&host->lock, flags);
1585
1586         if (host->flags & SDHCI_DEVICE_DEAD) {
1587                 spin_unlock_irqrestore(&host->lock, flags);
1588                 if (!IS_ERR(mmc->supply.vmmc) &&
1589                     ios->power_mode == MMC_POWER_OFF)
1590                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1591                 return;
1592         }
1593
1594         /*
1595          * Reset the chip on each power off.
1596          * Should clear out any weird states.
1597          */
1598         if (ios->power_mode == MMC_POWER_OFF) {
1599                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1600                 sdhci_reinit(host);
1601         }
1602
1603         if (host->version >= SDHCI_SPEC_300 &&
1604                 (ios->power_mode == MMC_POWER_UP) &&
1605                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1606                 sdhci_enable_preset_value(host, false);
1607
1608         if (!ios->clock || ios->clock != host->clock) {
1609                 host->ops->set_clock(host, ios->clock);
1610                 host->clock = ios->clock;
1611
1612                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1613                     host->clock) {
1614                         host->timeout_clk = host->mmc->actual_clock ?
1615                                                 host->mmc->actual_clock / 1000 :
1616                                                 host->clock / 1000;
1617                         host->mmc->max_busy_timeout =
1618                                 host->ops->get_max_timeout_count ?
1619                                 host->ops->get_max_timeout_count(host) :
1620                                 1 << 27;
1621                         host->mmc->max_busy_timeout /= host->timeout_clk;
1622                 }
1623         }
1624
1625         if (host->ops->set_power)
1626                 host->ops->set_power(host, ios->power_mode, ios->vdd);
1627         else
1628                 sdhci_set_power(host, ios->power_mode, ios->vdd);
1629
1630         if (host->ops->platform_send_init_74_clocks)
1631                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1632
1633         host->ops->set_bus_width(host, ios->bus_width);
1634
1635         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1636
1637         if ((ios->timing == MMC_TIMING_SD_HS ||
1638              ios->timing == MMC_TIMING_MMC_HS ||
1639              ios->timing == MMC_TIMING_MMC_HS400 ||
1640              ios->timing == MMC_TIMING_MMC_HS200 ||
1641              ios->timing == MMC_TIMING_MMC_DDR52 ||
1642              ios->timing == MMC_TIMING_UHS_SDR50 ||
1643              ios->timing == MMC_TIMING_UHS_SDR104 ||
1644              ios->timing == MMC_TIMING_UHS_DDR50 ||
1645              ios->timing == MMC_TIMING_UHS_SDR25)
1646             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1647                 ctrl |= SDHCI_CTRL_HISPD;
1648         else
1649                 ctrl &= ~SDHCI_CTRL_HISPD;
1650
1651         if (host->version >= SDHCI_SPEC_300) {
1652                 u16 clk, ctrl_2;
1653
1654                 if (!host->preset_enabled) {
1655                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1656                         /*
1657                          * We only need to set Driver Strength if the
1658                          * preset value enable is not set.
1659                          */
1660                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1661                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1662                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1663                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1664                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
1665                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1666                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1667                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1668                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
1669                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
1670                         else {
1671                                 pr_warn("%s: invalid driver type, default to driver type B\n",
1672                                         mmc_hostname(mmc));
1673                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1674                         }
1675
1676                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1677                 } else {
1678                         /*
1679                          * According to SDHC Spec v3.00, if the Preset Value
1680                          * Enable in the Host Control 2 register is set, we
1681                          * need to reset SD Clock Enable before changing High
1682                          * Speed Enable to avoid generating clock gliches.
1683                          */
1684
1685                         /* Reset SD Clock Enable */
1686                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1687                         clk &= ~SDHCI_CLOCK_CARD_EN;
1688                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1689
1690                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1691
1692                         /* Re-enable SD Clock */
1693                         host->ops->set_clock(host, host->clock);
1694                 }
1695
1696                 /* Reset SD Clock Enable */
1697                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1698                 clk &= ~SDHCI_CLOCK_CARD_EN;
1699                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1700
1701                 host->ops->set_uhs_signaling(host, ios->timing);
1702                 host->timing = ios->timing;
1703
1704                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1705                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1706                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
1707                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
1708                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
1709                                  (ios->timing == MMC_TIMING_UHS_DDR50) ||
1710                                  (ios->timing == MMC_TIMING_MMC_DDR52))) {
1711                         u16 preset;
1712
1713                         sdhci_enable_preset_value(host, true);
1714                         preset = sdhci_get_preset_value(host);
1715                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1716                                 >> SDHCI_PRESET_DRV_SHIFT;
1717                 }
1718
1719                 /* Re-enable SD Clock */
1720                 host->ops->set_clock(host, host->clock);
1721         } else
1722                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1723
1724         /*
1725          * Some (ENE) controllers go apeshit on some ios operation,
1726          * signalling timeout and CRC errors even on CMD0. Resetting
1727          * it on each ios seems to solve the problem.
1728          */
1729         if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1730                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1731
1732         mmiowb();
1733         spin_unlock_irqrestore(&host->lock, flags);
1734 }
1735
1736 static int sdhci_get_cd(struct mmc_host *mmc)
1737 {
1738         struct sdhci_host *host = mmc_priv(mmc);
1739         int gpio_cd = mmc_gpio_get_cd(mmc);
1740
1741         if (host->flags & SDHCI_DEVICE_DEAD)
1742                 return 0;
1743
1744         /* If nonremovable, assume that the card is always present. */
1745         if (!mmc_card_is_removable(host->mmc))
1746                 return 1;
1747
1748         /*
1749          * Try slot gpio detect, if defined it take precedence
1750          * over build in controller functionality
1751          */
1752         if (gpio_cd >= 0)
1753                 return !!gpio_cd;
1754
1755         /* If polling, assume that the card is always present. */
1756         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1757                 return 1;
1758
1759         /* Host native card detect */
1760         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1761 }
1762
1763 static int sdhci_check_ro(struct sdhci_host *host)
1764 {
1765         unsigned long flags;
1766         int is_readonly;
1767
1768         spin_lock_irqsave(&host->lock, flags);
1769
1770         if (host->flags & SDHCI_DEVICE_DEAD)
1771                 is_readonly = 0;
1772         else if (host->ops->get_ro)
1773                 is_readonly = host->ops->get_ro(host);
1774         else
1775                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1776                                 & SDHCI_WRITE_PROTECT);
1777
1778         spin_unlock_irqrestore(&host->lock, flags);
1779
1780         /* This quirk needs to be replaced by a callback-function later */
1781         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1782                 !is_readonly : is_readonly;
1783 }
1784
1785 #define SAMPLE_COUNT    5
1786
1787 static int sdhci_get_ro(struct mmc_host *mmc)
1788 {
1789         struct sdhci_host *host = mmc_priv(mmc);
1790         int i, ro_count;
1791
1792         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1793                 return sdhci_check_ro(host);
1794
1795         ro_count = 0;
1796         for (i = 0; i < SAMPLE_COUNT; i++) {
1797                 if (sdhci_check_ro(host)) {
1798                         if (++ro_count > SAMPLE_COUNT / 2)
1799                                 return 1;
1800                 }
1801                 msleep(30);
1802         }
1803         return 0;
1804 }
1805
1806 static void sdhci_hw_reset(struct mmc_host *mmc)
1807 {
1808         struct sdhci_host *host = mmc_priv(mmc);
1809
1810         if (host->ops && host->ops->hw_reset)
1811                 host->ops->hw_reset(host);
1812 }
1813
1814 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1815 {
1816         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1817                 if (enable)
1818                         host->ier |= SDHCI_INT_CARD_INT;
1819                 else
1820                         host->ier &= ~SDHCI_INT_CARD_INT;
1821
1822                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1823                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1824                 mmiowb();
1825         }
1826 }
1827
1828 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1829 {
1830         struct sdhci_host *host = mmc_priv(mmc);
1831         unsigned long flags;
1832
1833         if (enable)
1834                 pm_runtime_get_noresume(host->mmc->parent);
1835
1836         spin_lock_irqsave(&host->lock, flags);
1837         if (enable)
1838                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1839         else
1840                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1841
1842         sdhci_enable_sdio_irq_nolock(host, enable);
1843         spin_unlock_irqrestore(&host->lock, flags);
1844
1845         if (!enable)
1846                 pm_runtime_put_noidle(host->mmc->parent);
1847 }
1848
1849 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1850                                              struct mmc_ios *ios)
1851 {
1852         struct sdhci_host *host = mmc_priv(mmc);
1853         u16 ctrl;
1854         int ret;
1855
1856         /*
1857          * Signal Voltage Switching is only applicable for Host Controllers
1858          * v3.00 and above.
1859          */
1860         if (host->version < SDHCI_SPEC_300)
1861                 return 0;
1862
1863         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1864
1865         switch (ios->signal_voltage) {
1866         case MMC_SIGNAL_VOLTAGE_330:
1867                 if (!(host->flags & SDHCI_SIGNALING_330))
1868                         return -EINVAL;
1869                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1870                 ctrl &= ~SDHCI_CTRL_VDD_180;
1871                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1872
1873                 if (!IS_ERR(mmc->supply.vqmmc)) {
1874                         ret = mmc_regulator_set_vqmmc(mmc, ios);
1875                         if (ret) {
1876                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1877                                         mmc_hostname(mmc));
1878                                 return -EIO;
1879                         }
1880                 }
1881                 /* Wait for 5ms */
1882                 usleep_range(5000, 5500);
1883
1884                 /* 3.3V regulator output should be stable within 5 ms */
1885                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1886                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1887                         return 0;
1888
1889                 pr_warn("%s: 3.3V regulator output did not became stable\n",
1890                         mmc_hostname(mmc));
1891
1892                 return -EAGAIN;
1893         case MMC_SIGNAL_VOLTAGE_180:
1894                 if (!(host->flags & SDHCI_SIGNALING_180))
1895                         return -EINVAL;
1896                 if (!IS_ERR(mmc->supply.vqmmc)) {
1897                         ret = mmc_regulator_set_vqmmc(mmc, ios);
1898                         if (ret) {
1899                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1900                                         mmc_hostname(mmc));
1901                                 return -EIO;
1902                         }
1903                 }
1904
1905                 /*
1906                  * Enable 1.8V Signal Enable in the Host Control2
1907                  * register
1908                  */
1909                 ctrl |= SDHCI_CTRL_VDD_180;
1910                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1911
1912                 /* Some controller need to do more when switching */
1913                 if (host->ops->voltage_switch)
1914                         host->ops->voltage_switch(host);
1915
1916                 /* 1.8V regulator output should be stable within 5 ms */
1917                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1918                 if (ctrl & SDHCI_CTRL_VDD_180)
1919                         return 0;
1920
1921                 pr_warn("%s: 1.8V regulator output did not became stable\n",
1922                         mmc_hostname(mmc));
1923
1924                 return -EAGAIN;
1925         case MMC_SIGNAL_VOLTAGE_120:
1926                 if (!(host->flags & SDHCI_SIGNALING_120))
1927                         return -EINVAL;
1928                 if (!IS_ERR(mmc->supply.vqmmc)) {
1929                         ret = mmc_regulator_set_vqmmc(mmc, ios);
1930                         if (ret) {
1931                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1932                                         mmc_hostname(mmc));
1933                                 return -EIO;
1934                         }
1935                 }
1936                 return 0;
1937         default:
1938                 /* No signal voltage switch required */
1939                 return 0;
1940         }
1941 }
1942
1943 static int sdhci_card_busy(struct mmc_host *mmc)
1944 {
1945         struct sdhci_host *host = mmc_priv(mmc);
1946         u32 present_state;
1947
1948         /* Check whether DAT[0] is 0 */
1949         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1950
1951         return !(present_state & SDHCI_DATA_0_LVL_MASK);
1952 }
1953
1954 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1955 {
1956         struct sdhci_host *host = mmc_priv(mmc);
1957         unsigned long flags;
1958
1959         spin_lock_irqsave(&host->lock, flags);
1960         host->flags |= SDHCI_HS400_TUNING;
1961         spin_unlock_irqrestore(&host->lock, flags);
1962
1963         return 0;
1964 }
1965
1966 static void sdhci_start_tuning(struct sdhci_host *host)
1967 {
1968         u16 ctrl;
1969
1970         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1971         ctrl |= SDHCI_CTRL_EXEC_TUNING;
1972         if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
1973                 ctrl |= SDHCI_CTRL_TUNED_CLK;
1974         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1975
1976         /*
1977          * As per the Host Controller spec v3.00, tuning command
1978          * generates Buffer Read Ready interrupt, so enable that.
1979          *
1980          * Note: The spec clearly says that when tuning sequence
1981          * is being performed, the controller does not generate
1982          * interrupts other than Buffer Read Ready interrupt. But
1983          * to make sure we don't hit a controller bug, we _only_
1984          * enable Buffer Read Ready interrupt here.
1985          */
1986         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1987         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1988 }
1989
1990 static void sdhci_end_tuning(struct sdhci_host *host)
1991 {
1992         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1993         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1994 }
1995
1996 static void sdhci_reset_tuning(struct sdhci_host *host)
1997 {
1998         u16 ctrl;
1999
2000         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2001         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2002         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2003         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2004 }
2005
2006 static void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode,
2007                                unsigned long flags)
2008 {
2009         sdhci_reset_tuning(host);
2010
2011         sdhci_do_reset(host, SDHCI_RESET_CMD);
2012         sdhci_do_reset(host, SDHCI_RESET_DATA);
2013
2014         sdhci_end_tuning(host);
2015
2016         spin_unlock_irqrestore(&host->lock, flags);
2017         mmc_abort_tuning(host->mmc, opcode);
2018         spin_lock_irqsave(&host->lock, flags);
2019 }
2020
2021 /*
2022  * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2023  * tuning command does not have a data payload (or rather the hardware does it
2024  * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2025  * interrupt setup is different to other commands and there is no timeout
2026  * interrupt so special handling is needed.
2027  */
2028 static void sdhci_send_tuning(struct sdhci_host *host, u32 opcode,
2029                               unsigned long flags)
2030 {
2031         struct mmc_host *mmc = host->mmc;
2032         struct mmc_command cmd = {};
2033         struct mmc_request mrq = {};
2034
2035         cmd.opcode = opcode;
2036         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2037         cmd.mrq = &mrq;
2038
2039         mrq.cmd = &cmd;
2040         /*
2041          * In response to CMD19, the card sends 64 bytes of tuning
2042          * block to the Host Controller. So we set the block size
2043          * to 64 here.
2044          */
2045         if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2046             mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2047                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128), SDHCI_BLOCK_SIZE);
2048         else
2049                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), SDHCI_BLOCK_SIZE);
2050
2051         /*
2052          * The tuning block is sent by the card to the host controller.
2053          * So we set the TRNS_READ bit in the Transfer Mode register.
2054          * This also takes care of setting DMA Enable and Multi Block
2055          * Select in the same register to 0.
2056          */
2057         sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2058
2059         sdhci_send_command(host, &cmd);
2060
2061         host->cmd = NULL;
2062
2063         sdhci_del_timer(host, &mrq);
2064
2065         host->tuning_done = 0;
2066
2067         spin_unlock_irqrestore(&host->lock, flags);
2068
2069         /* Wait for Buffer Read Ready interrupt */
2070         wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2071                            msecs_to_jiffies(50));
2072
2073         spin_lock_irqsave(&host->lock, flags);
2074 }
2075
2076 static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode,
2077                                    unsigned long flags)
2078 {
2079         int i;
2080
2081         /*
2082          * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2083          * of loops reaches 40 times.
2084          */
2085         for (i = 0; i < MAX_TUNING_LOOP; i++) {
2086                 u16 ctrl;
2087
2088                 sdhci_send_tuning(host, opcode, flags);
2089
2090                 if (!host->tuning_done) {
2091                         pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
2092                                 mmc_hostname(host->mmc));
2093                         sdhci_abort_tuning(host, opcode, flags);
2094                         return;
2095                 }
2096
2097                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2098                 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2099                         if (ctrl & SDHCI_CTRL_TUNED_CLK)
2100                                 return; /* Success! */
2101                         break;
2102                 }
2103
2104                 /* eMMC spec does not require a delay between tuning cycles */
2105                 if (opcode == MMC_SEND_TUNING_BLOCK)
2106                         mdelay(1);
2107         }
2108
2109         pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2110                 mmc_hostname(host->mmc));
2111         sdhci_reset_tuning(host);
2112 }
2113
2114 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2115 {
2116         struct sdhci_host *host = mmc_priv(mmc);
2117         int err = 0;
2118         unsigned long flags;
2119         unsigned int tuning_count = 0;
2120         bool hs400_tuning;
2121
2122         spin_lock_irqsave(&host->lock, flags);
2123
2124         hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2125
2126         if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2127                 tuning_count = host->tuning_count;
2128
2129         /*
2130          * The Host Controller needs tuning in case of SDR104 and DDR50
2131          * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2132          * the Capabilities register.
2133          * If the Host Controller supports the HS200 mode then the
2134          * tuning function has to be executed.
2135          */
2136         switch (host->timing) {
2137         /* HS400 tuning is done in HS200 mode */
2138         case MMC_TIMING_MMC_HS400:
2139                 err = -EINVAL;
2140                 goto out_unlock;
2141
2142         case MMC_TIMING_MMC_HS200:
2143                 /*
2144                  * Periodic re-tuning for HS400 is not expected to be needed, so
2145                  * disable it here.
2146                  */
2147                 if (hs400_tuning)
2148                         tuning_count = 0;
2149                 break;
2150
2151         case MMC_TIMING_UHS_SDR104:
2152         case MMC_TIMING_UHS_DDR50:
2153                 break;
2154
2155         case MMC_TIMING_UHS_SDR50:
2156                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2157                         break;
2158                 /* FALLTHROUGH */
2159
2160         default:
2161                 goto out_unlock;
2162         }
2163
2164         if (host->ops->platform_execute_tuning) {
2165                 spin_unlock_irqrestore(&host->lock, flags);
2166                 err = host->ops->platform_execute_tuning(host, opcode);
2167                 spin_lock_irqsave(&host->lock, flags);
2168                 goto out_unlock;
2169         }
2170
2171         host->mmc->retune_period = tuning_count;
2172
2173         sdhci_start_tuning(host);
2174
2175         __sdhci_execute_tuning(host, opcode, flags);
2176
2177         sdhci_end_tuning(host);
2178 out_unlock:
2179         host->flags &= ~SDHCI_HS400_TUNING;
2180         spin_unlock_irqrestore(&host->lock, flags);
2181
2182         return err;
2183 }
2184 EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2185
2186 static int sdhci_select_drive_strength(struct mmc_card *card,
2187                                        unsigned int max_dtr, int host_drv,
2188                                        int card_drv, int *drv_type)
2189 {
2190         struct sdhci_host *host = mmc_priv(card->host);
2191
2192         if (!host->ops->select_drive_strength)
2193                 return 0;
2194
2195         return host->ops->select_drive_strength(host, card, max_dtr, host_drv,
2196                                                 card_drv, drv_type);
2197 }
2198
2199 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2200 {
2201         /* Host Controller v3.00 defines preset value registers */
2202         if (host->version < SDHCI_SPEC_300)
2203                 return;
2204
2205         /*
2206          * We only enable or disable Preset Value if they are not already
2207          * enabled or disabled respectively. Otherwise, we bail out.
2208          */
2209         if (host->preset_enabled != enable) {
2210                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2211
2212                 if (enable)
2213                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2214                 else
2215                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2216
2217                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2218
2219                 if (enable)
2220                         host->flags |= SDHCI_PV_ENABLED;
2221                 else
2222                         host->flags &= ~SDHCI_PV_ENABLED;
2223
2224                 host->preset_enabled = enable;
2225         }
2226 }
2227
2228 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2229                                 int err)
2230 {
2231         struct sdhci_host *host = mmc_priv(mmc);
2232         struct mmc_data *data = mrq->data;
2233
2234         if (data->host_cookie != COOKIE_UNMAPPED)
2235                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2236                              data->flags & MMC_DATA_WRITE ?
2237                                DMA_TO_DEVICE : DMA_FROM_DEVICE);
2238
2239         data->host_cookie = COOKIE_UNMAPPED;
2240 }
2241
2242 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2243 {
2244         struct sdhci_host *host = mmc_priv(mmc);
2245
2246         mrq->data->host_cookie = COOKIE_UNMAPPED;
2247
2248         if (host->flags & SDHCI_REQ_USE_DMA)
2249                 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2250 }
2251
2252 static inline bool sdhci_has_requests(struct sdhci_host *host)
2253 {
2254         return host->cmd || host->data_cmd;
2255 }
2256
2257 static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
2258 {
2259         if (host->data_cmd) {
2260                 host->data_cmd->error = err;
2261                 sdhci_finish_mrq(host, host->data_cmd->mrq);
2262         }
2263
2264         if (host->cmd) {
2265                 host->cmd->error = err;
2266                 sdhci_finish_mrq(host, host->cmd->mrq);
2267         }
2268 }
2269
2270 static void sdhci_card_event(struct mmc_host *mmc)
2271 {
2272         struct sdhci_host *host = mmc_priv(mmc);
2273         unsigned long flags;
2274         int present;
2275
2276         /* First check if client has provided their own card event */
2277         if (host->ops->card_event)
2278                 host->ops->card_event(host);
2279
2280         present = mmc->ops->get_cd(mmc);
2281
2282         spin_lock_irqsave(&host->lock, flags);
2283
2284         /* Check sdhci_has_requests() first in case we are runtime suspended */
2285         if (sdhci_has_requests(host) && !present) {
2286                 pr_err("%s: Card removed during transfer!\n",
2287                         mmc_hostname(host->mmc));
2288                 pr_err("%s: Resetting controller.\n",
2289                         mmc_hostname(host->mmc));
2290
2291                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2292                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2293
2294                 sdhci_error_out_mrqs(host, -ENOMEDIUM);
2295         }
2296
2297         spin_unlock_irqrestore(&host->lock, flags);
2298 }
2299
2300 static const struct mmc_host_ops sdhci_ops = {
2301         .request        = sdhci_request,
2302         .post_req       = sdhci_post_req,
2303         .pre_req        = sdhci_pre_req,
2304         .set_ios        = sdhci_set_ios,
2305         .get_cd         = sdhci_get_cd,
2306         .get_ro         = sdhci_get_ro,
2307         .hw_reset       = sdhci_hw_reset,
2308         .enable_sdio_irq = sdhci_enable_sdio_irq,
2309         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2310         .prepare_hs400_tuning           = sdhci_prepare_hs400_tuning,
2311         .execute_tuning                 = sdhci_execute_tuning,
2312         .select_drive_strength          = sdhci_select_drive_strength,
2313         .card_event                     = sdhci_card_event,
2314         .card_busy      = sdhci_card_busy,
2315 };
2316
2317 /*****************************************************************************\
2318  *                                                                           *
2319  * Tasklets                                                                  *
2320  *                                                                           *
2321 \*****************************************************************************/
2322
2323 static bool sdhci_request_done(struct sdhci_host *host)
2324 {
2325         unsigned long flags;
2326         struct mmc_request *mrq;
2327         int i;
2328
2329         spin_lock_irqsave(&host->lock, flags);
2330
2331         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
2332                 mrq = host->mrqs_done[i];
2333                 if (mrq)
2334                         break;
2335         }
2336
2337         if (!mrq) {
2338                 spin_unlock_irqrestore(&host->lock, flags);
2339                 return true;
2340         }
2341
2342         sdhci_del_timer(host, mrq);
2343
2344         /*
2345          * Always unmap the data buffers if they were mapped by
2346          * sdhci_prepare_data() whenever we finish with a request.
2347          * This avoids leaking DMA mappings on error.
2348          */
2349         if (host->flags & SDHCI_REQ_USE_DMA) {
2350                 struct mmc_data *data = mrq->data;
2351
2352                 if (data && data->host_cookie == COOKIE_MAPPED) {
2353                         dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2354                                      (data->flags & MMC_DATA_READ) ?
2355                                      DMA_FROM_DEVICE : DMA_TO_DEVICE);
2356                         data->host_cookie = COOKIE_UNMAPPED;
2357                 }
2358         }
2359
2360         /*
2361          * The controller needs a reset of internal state machines
2362          * upon error conditions.
2363          */
2364         if (sdhci_needs_reset(host, mrq)) {
2365                 /*
2366                  * Do not finish until command and data lines are available for
2367                  * reset. Note there can only be one other mrq, so it cannot
2368                  * also be in mrqs_done, otherwise host->cmd and host->data_cmd
2369                  * would both be null.
2370                  */
2371                 if (host->cmd || host->data_cmd) {
2372                         spin_unlock_irqrestore(&host->lock, flags);
2373                         return true;
2374                 }
2375
2376                 /* Some controllers need this kick or reset won't work here */
2377                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2378                         /* This is to force an update */
2379                         host->ops->set_clock(host, host->clock);
2380
2381                 /* Spec says we should do both at the same time, but Ricoh
2382                    controllers do not like that. */
2383                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2384                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2385
2386                 host->pending_reset = false;
2387         }
2388
2389         if (!sdhci_has_requests(host))
2390                 sdhci_led_deactivate(host);
2391
2392         host->mrqs_done[i] = NULL;
2393
2394         mmiowb();
2395         spin_unlock_irqrestore(&host->lock, flags);
2396
2397         mmc_request_done(host->mmc, mrq);
2398
2399         return false;
2400 }
2401
2402 static void sdhci_tasklet_finish(unsigned long param)
2403 {
2404         struct sdhci_host *host = (struct sdhci_host *)param;
2405
2406         while (!sdhci_request_done(host))
2407                 ;
2408 }
2409
2410 static void sdhci_timeout_timer(unsigned long data)
2411 {
2412         struct sdhci_host *host;
2413         unsigned long flags;
2414
2415         host = (struct sdhci_host*)data;
2416
2417         spin_lock_irqsave(&host->lock, flags);
2418
2419         if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
2420                 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
2421                        mmc_hostname(host->mmc));
2422                 sdhci_dumpregs(host);
2423
2424                 host->cmd->error = -ETIMEDOUT;
2425                 sdhci_finish_mrq(host, host->cmd->mrq);
2426         }
2427
2428         mmiowb();
2429         spin_unlock_irqrestore(&host->lock, flags);
2430 }
2431
2432 static void sdhci_timeout_data_timer(unsigned long data)
2433 {
2434         struct sdhci_host *host;
2435         unsigned long flags;
2436
2437         host = (struct sdhci_host *)data;
2438
2439         spin_lock_irqsave(&host->lock, flags);
2440
2441         if (host->data || host->data_cmd ||
2442             (host->cmd && sdhci_data_line_cmd(host->cmd))) {
2443                 pr_err("%s: Timeout waiting for hardware interrupt.\n",
2444                        mmc_hostname(host->mmc));
2445                 sdhci_dumpregs(host);
2446
2447                 if (host->data) {
2448                         host->data->error = -ETIMEDOUT;
2449                         sdhci_finish_data(host);
2450                 } else if (host->data_cmd) {
2451                         host->data_cmd->error = -ETIMEDOUT;
2452                         sdhci_finish_mrq(host, host->data_cmd->mrq);
2453                 } else {
2454                         host->cmd->error = -ETIMEDOUT;
2455                         sdhci_finish_mrq(host, host->cmd->mrq);
2456                 }
2457         }
2458
2459         mmiowb();
2460         spin_unlock_irqrestore(&host->lock, flags);
2461 }
2462
2463 /*****************************************************************************\
2464  *                                                                           *
2465  * Interrupt handling                                                        *
2466  *                                                                           *
2467 \*****************************************************************************/
2468
2469 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
2470 {
2471         if (!host->cmd) {
2472                 /*
2473                  * SDHCI recovers from errors by resetting the cmd and data
2474                  * circuits.  Until that is done, there very well might be more
2475                  * interrupts, so ignore them in that case.
2476                  */
2477                 if (host->pending_reset)
2478                         return;
2479                 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
2480                        mmc_hostname(host->mmc), (unsigned)intmask);
2481                 sdhci_dumpregs(host);
2482                 return;
2483         }
2484
2485         if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
2486                        SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
2487                 if (intmask & SDHCI_INT_TIMEOUT)
2488                         host->cmd->error = -ETIMEDOUT;
2489                 else
2490                         host->cmd->error = -EILSEQ;
2491
2492                 /*
2493                  * If this command initiates a data phase and a response
2494                  * CRC error is signalled, the card can start transferring
2495                  * data - the card may have received the command without
2496                  * error.  We must not terminate the mmc_request early.
2497                  *
2498                  * If the card did not receive the command or returned an
2499                  * error which prevented it sending data, the data phase
2500                  * will time out.
2501                  */
2502                 if (host->cmd->data &&
2503                     (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
2504                      SDHCI_INT_CRC) {
2505                         host->cmd = NULL;
2506                         return;
2507                 }
2508
2509                 sdhci_finish_mrq(host, host->cmd->mrq);
2510                 return;
2511         }
2512
2513         if (intmask & SDHCI_INT_RESPONSE)
2514                 sdhci_finish_command(host);
2515 }
2516
2517 #ifdef CONFIG_MMC_DEBUG
2518 static void sdhci_adma_show_error(struct sdhci_host *host)
2519 {
2520         const char *name = mmc_hostname(host->mmc);
2521         void *desc = host->adma_table;
2522
2523         sdhci_dumpregs(host);
2524
2525         while (true) {
2526                 struct sdhci_adma2_64_desc *dma_desc = desc;
2527
2528                 if (host->flags & SDHCI_USE_64_BIT_DMA)
2529                         DBG("%s: %p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2530                             name, desc, le32_to_cpu(dma_desc->addr_hi),
2531                             le32_to_cpu(dma_desc->addr_lo),
2532                             le16_to_cpu(dma_desc->len),
2533                             le16_to_cpu(dma_desc->cmd));
2534                 else
2535                         DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2536                             name, desc, le32_to_cpu(dma_desc->addr_lo),
2537                             le16_to_cpu(dma_desc->len),
2538                             le16_to_cpu(dma_desc->cmd));
2539
2540                 desc += host->desc_sz;
2541
2542                 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2543                         break;
2544         }
2545 }
2546 #else
2547 static void sdhci_adma_show_error(struct sdhci_host *host) { }
2548 #endif
2549
2550 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2551 {
2552         u32 command;
2553
2554         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2555         if (intmask & SDHCI_INT_DATA_AVAIL) {
2556                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2557                 if (command == MMC_SEND_TUNING_BLOCK ||
2558                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2559                         host->tuning_done = 1;
2560                         wake_up(&host->buf_ready_int);
2561                         return;
2562                 }
2563         }
2564
2565         if (!host->data) {
2566                 struct mmc_command *data_cmd = host->data_cmd;
2567
2568                 /*
2569                  * The "data complete" interrupt is also used to
2570                  * indicate that a busy state has ended. See comment
2571                  * above in sdhci_cmd_irq().
2572                  */
2573                 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
2574                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2575                                 host->data_cmd = NULL;
2576                                 data_cmd->error = -ETIMEDOUT;
2577                                 sdhci_finish_mrq(host, data_cmd->mrq);
2578                                 return;
2579                         }
2580                         if (intmask & SDHCI_INT_DATA_END) {
2581                                 host->data_cmd = NULL;
2582                                 /*
2583                                  * Some cards handle busy-end interrupt
2584                                  * before the command completed, so make
2585                                  * sure we do things in the proper order.
2586                                  */
2587                                 if (host->cmd == data_cmd)
2588                                         return;
2589
2590                                 sdhci_finish_mrq(host, data_cmd->mrq);
2591                                 return;
2592                         }
2593                 }
2594
2595                 /*
2596                  * SDHCI recovers from errors by resetting the cmd and data
2597                  * circuits. Until that is done, there very well might be more
2598                  * interrupts, so ignore them in that case.
2599                  */
2600                 if (host->pending_reset)
2601                         return;
2602
2603                 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
2604                        mmc_hostname(host->mmc), (unsigned)intmask);
2605                 sdhci_dumpregs(host);
2606
2607                 return;
2608         }
2609
2610         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2611                 host->data->error = -ETIMEDOUT;
2612         else if (intmask & SDHCI_INT_DATA_END_BIT)
2613                 host->data->error = -EILSEQ;
2614         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2615                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2616                         != MMC_BUS_TEST_R)
2617                 host->data->error = -EILSEQ;
2618         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2619                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2620                 sdhci_adma_show_error(host);
2621                 host->data->error = -EIO;
2622                 if (host->ops->adma_workaround)
2623                         host->ops->adma_workaround(host, intmask);
2624         }
2625
2626         if (host->data->error)
2627                 sdhci_finish_data(host);
2628         else {
2629                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2630                         sdhci_transfer_pio(host);
2631
2632                 /*
2633                  * We currently don't do anything fancy with DMA
2634                  * boundaries, but as we can't disable the feature
2635                  * we need to at least restart the transfer.
2636                  *
2637                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2638                  * should return a valid address to continue from, but as
2639                  * some controllers are faulty, don't trust them.
2640                  */
2641                 if (intmask & SDHCI_INT_DMA_END) {
2642                         u32 dmastart, dmanow;
2643                         dmastart = sg_dma_address(host->data->sg);
2644                         dmanow = dmastart + host->data->bytes_xfered;
2645                         /*
2646                          * Force update to the next DMA block boundary.
2647                          */
2648                         dmanow = (dmanow &
2649                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2650                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2651                         host->data->bytes_xfered = dmanow - dmastart;
2652                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2653                                 " next 0x%08x\n",
2654                                 mmc_hostname(host->mmc), dmastart,
2655                                 host->data->bytes_xfered, dmanow);
2656                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2657                 }
2658
2659                 if (intmask & SDHCI_INT_DATA_END) {
2660                         if (host->cmd == host->data_cmd) {
2661                                 /*
2662                                  * Data managed to finish before the
2663                                  * command completed. Make sure we do
2664                                  * things in the proper order.
2665                                  */
2666                                 host->data_early = 1;
2667                         } else {
2668                                 sdhci_finish_data(host);
2669                         }
2670                 }
2671         }
2672 }
2673
2674 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2675 {
2676         irqreturn_t result = IRQ_NONE;
2677         struct sdhci_host *host = dev_id;
2678         u32 intmask, mask, unexpected = 0;
2679         int max_loops = 16;
2680
2681         spin_lock(&host->lock);
2682
2683         if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2684                 spin_unlock(&host->lock);
2685                 return IRQ_NONE;
2686         }
2687
2688         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2689         if (!intmask || intmask == 0xffffffff) {
2690                 result = IRQ_NONE;
2691                 goto out;
2692         }
2693
2694         do {
2695                 /* Clear selected interrupts. */
2696                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2697                                   SDHCI_INT_BUS_POWER);
2698                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2699
2700                 DBG("*** %s got interrupt: 0x%08x\n",
2701                         mmc_hostname(host->mmc), intmask);
2702
2703                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2704                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2705                                       SDHCI_CARD_PRESENT;
2706
2707                         /*
2708                          * There is a observation on i.mx esdhc.  INSERT
2709                          * bit will be immediately set again when it gets
2710                          * cleared, if a card is inserted.  We have to mask
2711                          * the irq to prevent interrupt storm which will
2712                          * freeze the system.  And the REMOVE gets the
2713                          * same situation.
2714                          *
2715                          * More testing are needed here to ensure it works
2716                          * for other platforms though.
2717                          */
2718                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
2719                                        SDHCI_INT_CARD_REMOVE);
2720                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2721                                                SDHCI_INT_CARD_INSERT;
2722                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2723                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2724
2725                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2726                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2727
2728                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2729                                                        SDHCI_INT_CARD_REMOVE);
2730                         result = IRQ_WAKE_THREAD;
2731                 }
2732
2733                 if (intmask & SDHCI_INT_CMD_MASK)
2734                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2735
2736                 if (intmask & SDHCI_INT_DATA_MASK)
2737                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2738
2739                 if (intmask & SDHCI_INT_BUS_POWER)
2740                         pr_err("%s: Card is consuming too much power!\n",
2741                                 mmc_hostname(host->mmc));
2742
2743                 if (intmask & SDHCI_INT_RETUNE)
2744                         mmc_retune_needed(host->mmc);
2745
2746                 if ((intmask & SDHCI_INT_CARD_INT) &&
2747                     (host->ier & SDHCI_INT_CARD_INT)) {
2748                         sdhci_enable_sdio_irq_nolock(host, false);
2749                         host->thread_isr |= SDHCI_INT_CARD_INT;
2750                         result = IRQ_WAKE_THREAD;
2751                 }
2752
2753                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2754                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2755                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2756                              SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
2757
2758                 if (intmask) {
2759                         unexpected |= intmask;
2760                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2761                 }
2762
2763                 if (result == IRQ_NONE)
2764                         result = IRQ_HANDLED;
2765
2766                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2767         } while (intmask && --max_loops);
2768 out:
2769         spin_unlock(&host->lock);
2770
2771         if (unexpected) {
2772                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2773                            mmc_hostname(host->mmc), unexpected);
2774                 sdhci_dumpregs(host);
2775         }
2776
2777         return result;
2778 }
2779
2780 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2781 {
2782         struct sdhci_host *host = dev_id;
2783         unsigned long flags;
2784         u32 isr;
2785
2786         spin_lock_irqsave(&host->lock, flags);
2787         isr = host->thread_isr;
2788         host->thread_isr = 0;
2789         spin_unlock_irqrestore(&host->lock, flags);
2790
2791         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2792                 struct mmc_host *mmc = host->mmc;
2793
2794                 mmc->ops->card_event(mmc);
2795                 mmc_detect_change(mmc, msecs_to_jiffies(200));
2796         }
2797
2798         if (isr & SDHCI_INT_CARD_INT) {
2799                 sdio_run_irqs(host->mmc);
2800
2801                 spin_lock_irqsave(&host->lock, flags);
2802                 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2803                         sdhci_enable_sdio_irq_nolock(host, true);
2804                 spin_unlock_irqrestore(&host->lock, flags);
2805         }
2806
2807         return isr ? IRQ_HANDLED : IRQ_NONE;
2808 }
2809
2810 /*****************************************************************************\
2811  *                                                                           *
2812  * Suspend/resume                                                            *
2813  *                                                                           *
2814 \*****************************************************************************/
2815
2816 #ifdef CONFIG_PM
2817 /*
2818  * To enable wakeup events, the corresponding events have to be enabled in
2819  * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
2820  * Table' in the SD Host Controller Standard Specification.
2821  * It is useless to restore SDHCI_INT_ENABLE state in
2822  * sdhci_disable_irq_wakeups() since it will be set by
2823  * sdhci_enable_card_detection() or sdhci_init().
2824  */
2825 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2826 {
2827         u8 val;
2828         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2829                         | SDHCI_WAKE_ON_INT;
2830         u32 irq_val = SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2831                       SDHCI_INT_CARD_INT;
2832
2833         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2834         val |= mask ;
2835         /* Avoid fake wake up */
2836         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
2837                 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2838                 irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
2839         }
2840         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2841         sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
2842 }
2843 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2844
2845 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2846 {
2847         u8 val;
2848         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2849                         | SDHCI_WAKE_ON_INT;
2850
2851         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2852         val &= ~mask;
2853         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2854 }
2855
2856 int sdhci_suspend_host(struct sdhci_host *host)
2857 {
2858         sdhci_disable_card_detection(host);
2859
2860         mmc_retune_timer_stop(host->mmc);
2861         if (host->tuning_mode != SDHCI_TUNING_MODE_3)
2862                 mmc_retune_needed(host->mmc);
2863
2864         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2865                 host->ier = 0;
2866                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2867                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2868                 free_irq(host->irq, host);
2869         } else {
2870                 sdhci_enable_irq_wakeups(host);
2871                 enable_irq_wake(host->irq);
2872         }
2873         return 0;
2874 }
2875
2876 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2877
2878 int sdhci_resume_host(struct sdhci_host *host)
2879 {
2880         struct mmc_host *mmc = host->mmc;
2881         int ret = 0;
2882
2883         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2884                 if (host->ops->enable_dma)
2885                         host->ops->enable_dma(host);
2886         }
2887
2888         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2889             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2890                 /* Card keeps power but host controller does not */
2891                 sdhci_init(host, 0);
2892                 host->pwr = 0;
2893                 host->clock = 0;
2894                 mmc->ops->set_ios(mmc, &mmc->ios);
2895         } else {
2896                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2897                 mmiowb();
2898         }
2899
2900         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2901                 ret = request_threaded_irq(host->irq, sdhci_irq,
2902                                            sdhci_thread_irq, IRQF_SHARED,
2903                                            mmc_hostname(host->mmc), host);
2904                 if (ret)
2905                         return ret;
2906         } else {
2907                 sdhci_disable_irq_wakeups(host);
2908                 disable_irq_wake(host->irq);
2909         }
2910
2911         sdhci_enable_card_detection(host);
2912
2913         return ret;
2914 }
2915
2916 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2917
2918 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2919 {
2920         unsigned long flags;
2921
2922         mmc_retune_timer_stop(host->mmc);
2923         if (host->tuning_mode != SDHCI_TUNING_MODE_3)
2924                 mmc_retune_needed(host->mmc);
2925
2926         spin_lock_irqsave(&host->lock, flags);
2927         host->ier &= SDHCI_INT_CARD_INT;
2928         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2929         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2930         spin_unlock_irqrestore(&host->lock, flags);
2931
2932         synchronize_hardirq(host->irq);
2933
2934         spin_lock_irqsave(&host->lock, flags);
2935         host->runtime_suspended = true;
2936         spin_unlock_irqrestore(&host->lock, flags);
2937
2938         return 0;
2939 }
2940 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2941
2942 int sdhci_runtime_resume_host(struct sdhci_host *host)
2943 {
2944         struct mmc_host *mmc = host->mmc;
2945         unsigned long flags;
2946         int host_flags = host->flags;
2947
2948         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2949                 if (host->ops->enable_dma)
2950                         host->ops->enable_dma(host);
2951         }
2952
2953         sdhci_init(host, 0);
2954
2955         if (mmc->ios.power_mode != MMC_POWER_UNDEFINED) {
2956                 /* Force clock and power re-program */
2957                 host->pwr = 0;
2958                 host->clock = 0;
2959                 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
2960                 mmc->ops->set_ios(mmc, &mmc->ios);
2961
2962                 if ((host_flags & SDHCI_PV_ENABLED) &&
2963                     !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2964                         spin_lock_irqsave(&host->lock, flags);
2965                         sdhci_enable_preset_value(host, true);
2966                         spin_unlock_irqrestore(&host->lock, flags);
2967                 }
2968
2969                 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
2970                     mmc->ops->hs400_enhanced_strobe)
2971                         mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
2972         }
2973
2974         spin_lock_irqsave(&host->lock, flags);
2975
2976         host->runtime_suspended = false;
2977
2978         /* Enable SDIO IRQ */
2979         if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2980                 sdhci_enable_sdio_irq_nolock(host, true);
2981
2982         /* Enable Card Detection */
2983         sdhci_enable_card_detection(host);
2984
2985         spin_unlock_irqrestore(&host->lock, flags);
2986
2987         return 0;
2988 }
2989 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2990
2991 #endif /* CONFIG_PM */
2992
2993 /*****************************************************************************\
2994  *                                                                           *
2995  * Device allocation/registration                                            *
2996  *                                                                           *
2997 \*****************************************************************************/
2998
2999 struct sdhci_host *sdhci_alloc_host(struct device *dev,
3000         size_t priv_size)
3001 {
3002         struct mmc_host *mmc;
3003         struct sdhci_host *host;
3004
3005         WARN_ON(dev == NULL);
3006
3007         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
3008         if (!mmc)
3009                 return ERR_PTR(-ENOMEM);
3010
3011         host = mmc_priv(mmc);
3012         host->mmc = mmc;
3013         host->mmc_host_ops = sdhci_ops;
3014         mmc->ops = &host->mmc_host_ops;
3015
3016         host->flags = SDHCI_SIGNALING_330;
3017
3018         return host;
3019 }
3020
3021 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
3022
3023 static int sdhci_set_dma_mask(struct sdhci_host *host)
3024 {
3025         struct mmc_host *mmc = host->mmc;
3026         struct device *dev = mmc_dev(mmc);
3027         int ret = -EINVAL;
3028
3029         if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
3030                 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3031
3032         /* Try 64-bit mask if hardware is capable  of it */
3033         if (host->flags & SDHCI_USE_64_BIT_DMA) {
3034                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
3035                 if (ret) {
3036                         pr_warn("%s: Failed to set 64-bit DMA mask.\n",
3037                                 mmc_hostname(mmc));
3038                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
3039                 }
3040         }
3041
3042         /* 32-bit mask as default & fallback */
3043         if (ret) {
3044                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
3045                 if (ret)
3046                         pr_warn("%s: Failed to set 32-bit DMA mask.\n",
3047                                 mmc_hostname(mmc));
3048         }
3049
3050         return ret;
3051 }
3052
3053 void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
3054 {
3055         u16 v;
3056         u64 dt_caps_mask = 0;
3057         u64 dt_caps = 0;
3058
3059         if (host->read_caps)
3060                 return;
3061
3062         host->read_caps = true;
3063
3064         if (debug_quirks)
3065                 host->quirks = debug_quirks;
3066
3067         if (debug_quirks2)
3068                 host->quirks2 = debug_quirks2;
3069
3070         sdhci_do_reset(host, SDHCI_RESET_ALL);
3071
3072         of_property_read_u64(mmc_dev(host->mmc)->of_node,
3073                              "sdhci-caps-mask", &dt_caps_mask);
3074         of_property_read_u64(mmc_dev(host->mmc)->of_node,
3075                              "sdhci-caps", &dt_caps);
3076
3077         v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
3078         host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
3079
3080         if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
3081                 return;
3082
3083         if (caps) {
3084                 host->caps = *caps;
3085         } else {
3086                 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
3087                 host->caps &= ~lower_32_bits(dt_caps_mask);
3088                 host->caps |= lower_32_bits(dt_caps);
3089         }
3090
3091         if (host->version < SDHCI_SPEC_300)
3092                 return;
3093
3094         if (caps1) {
3095                 host->caps1 = *caps1;
3096         } else {
3097                 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
3098                 host->caps1 &= ~upper_32_bits(dt_caps_mask);
3099                 host->caps1 |= upper_32_bits(dt_caps);
3100         }
3101 }
3102 EXPORT_SYMBOL_GPL(__sdhci_read_caps);
3103
3104 int sdhci_setup_host(struct sdhci_host *host)
3105 {
3106         struct mmc_host *mmc;
3107         u32 max_current_caps;
3108         unsigned int ocr_avail;
3109         unsigned int override_timeout_clk;
3110         u32 max_clk;
3111         int ret;
3112
3113         WARN_ON(host == NULL);
3114         if (host == NULL)
3115                 return -EINVAL;
3116
3117         mmc = host->mmc;
3118
3119         /*
3120          * If there are external regulators, get them. Note this must be done
3121          * early before resetting the host and reading the capabilities so that
3122          * the host can take the appropriate action if regulators are not
3123          * available.
3124          */
3125         ret = mmc_regulator_get_supply(mmc);
3126         if (ret == -EPROBE_DEFER)
3127                 return ret;
3128
3129         sdhci_read_caps(host);
3130
3131         override_timeout_clk = host->timeout_clk;
3132
3133         if (host->version > SDHCI_SPEC_300) {
3134                 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
3135                        mmc_hostname(mmc), host->version);
3136         }
3137
3138         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
3139                 host->flags |= SDHCI_USE_SDMA;
3140         else if (!(host->caps & SDHCI_CAN_DO_SDMA))
3141                 DBG("Controller doesn't have SDMA capability\n");
3142         else
3143                 host->flags |= SDHCI_USE_SDMA;
3144
3145         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
3146                 (host->flags & SDHCI_USE_SDMA)) {
3147                 DBG("Disabling DMA as it is marked broken\n");
3148                 host->flags &= ~SDHCI_USE_SDMA;
3149         }
3150
3151         if ((host->version >= SDHCI_SPEC_200) &&
3152                 (host->caps & SDHCI_CAN_DO_ADMA2))
3153                 host->flags |= SDHCI_USE_ADMA;
3154
3155         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
3156                 (host->flags & SDHCI_USE_ADMA)) {
3157                 DBG("Disabling ADMA as it is marked broken\n");
3158                 host->flags &= ~SDHCI_USE_ADMA;
3159         }
3160
3161         /*
3162          * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
3163          * and *must* do 64-bit DMA.  A driver has the opportunity to change
3164          * that during the first call to ->enable_dma().  Similarly
3165          * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
3166          * implement.
3167          */
3168         if (host->caps & SDHCI_CAN_64BIT)
3169                 host->flags |= SDHCI_USE_64_BIT_DMA;
3170
3171         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3172                 ret = sdhci_set_dma_mask(host);
3173
3174                 if (!ret && host->ops->enable_dma)
3175                         ret = host->ops->enable_dma(host);
3176
3177                 if (ret) {
3178                         pr_warn("%s: No suitable DMA available - falling back to PIO\n",
3179                                 mmc_hostname(mmc));
3180                         host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
3181
3182                         ret = 0;
3183                 }
3184         }
3185
3186         /* SDMA does not support 64-bit DMA */
3187         if (host->flags & SDHCI_USE_64_BIT_DMA)
3188                 host->flags &= ~SDHCI_USE_SDMA;
3189
3190         if (host->flags & SDHCI_USE_ADMA) {
3191                 dma_addr_t dma;
3192                 void *buf;
3193
3194                 /*
3195                  * The DMA descriptor table size is calculated as the maximum
3196                  * number of segments times 2, to allow for an alignment
3197                  * descriptor for each segment, plus 1 for a nop end descriptor,
3198                  * all multipled by the descriptor size.
3199                  */
3200                 if (host->flags & SDHCI_USE_64_BIT_DMA) {
3201                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
3202                                               SDHCI_ADMA2_64_DESC_SZ;
3203                         host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
3204                 } else {
3205                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
3206                                               SDHCI_ADMA2_32_DESC_SZ;
3207                         host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
3208                 }
3209
3210                 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
3211                 buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz +
3212                                          host->adma_table_sz, &dma, GFP_KERNEL);
3213                 if (!buf) {
3214                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
3215                                 mmc_hostname(mmc));
3216                         host->flags &= ~SDHCI_USE_ADMA;
3217                 } else if ((dma + host->align_buffer_sz) &
3218                            (SDHCI_ADMA2_DESC_ALIGN - 1)) {
3219                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
3220                                 mmc_hostname(mmc));
3221                         host->flags &= ~SDHCI_USE_ADMA;
3222                         dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3223                                           host->adma_table_sz, buf, dma);
3224                 } else {
3225                         host->align_buffer = buf;
3226                         host->align_addr = dma;
3227
3228                         host->adma_table = buf + host->align_buffer_sz;
3229                         host->adma_addr = dma + host->align_buffer_sz;
3230                 }
3231         }
3232
3233         /*
3234          * If we use DMA, then it's up to the caller to set the DMA
3235          * mask, but PIO does not need the hw shim so we set a new
3236          * mask here in that case.
3237          */
3238         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
3239                 host->dma_mask = DMA_BIT_MASK(64);
3240                 mmc_dev(mmc)->dma_mask = &host->dma_mask;
3241         }
3242
3243         if (host->version >= SDHCI_SPEC_300)
3244                 host->max_clk = (host->caps & SDHCI_CLOCK_V3_BASE_MASK)
3245                         >> SDHCI_CLOCK_BASE_SHIFT;
3246         else
3247                 host->max_clk = (host->caps & SDHCI_CLOCK_BASE_MASK)
3248                         >> SDHCI_CLOCK_BASE_SHIFT;
3249
3250         host->max_clk *= 1000000;
3251         if (host->max_clk == 0 || host->quirks &
3252                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
3253                 if (!host->ops->get_max_clock) {
3254                         pr_err("%s: Hardware doesn't specify base clock frequency.\n",
3255                                mmc_hostname(mmc));
3256                         ret = -ENODEV;
3257                         goto undma;
3258                 }
3259                 host->max_clk = host->ops->get_max_clock(host);
3260         }
3261
3262         /*
3263          * In case of Host Controller v3.00, find out whether clock
3264          * multiplier is supported.
3265          */
3266         host->clk_mul = (host->caps1 & SDHCI_CLOCK_MUL_MASK) >>
3267                         SDHCI_CLOCK_MUL_SHIFT;
3268
3269         /*
3270          * In case the value in Clock Multiplier is 0, then programmable
3271          * clock mode is not supported, otherwise the actual clock
3272          * multiplier is one more than the value of Clock Multiplier
3273          * in the Capabilities Register.
3274          */
3275         if (host->clk_mul)
3276                 host->clk_mul += 1;
3277
3278         /*
3279          * Set host parameters.
3280          */
3281         max_clk = host->max_clk;
3282
3283         if (host->ops->get_min_clock)
3284                 mmc->f_min = host->ops->get_min_clock(host);
3285         else if (host->version >= SDHCI_SPEC_300) {
3286                 if (host->clk_mul) {
3287                         mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
3288                         max_clk = host->max_clk * host->clk_mul;
3289                 } else
3290                         mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
3291         } else
3292                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
3293
3294         if (!mmc->f_max || mmc->f_max > max_clk)
3295                 mmc->f_max = max_clk;
3296
3297         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3298                 host->timeout_clk = (host->caps & SDHCI_TIMEOUT_CLK_MASK) >>
3299                                         SDHCI_TIMEOUT_CLK_SHIFT;
3300                 if (host->timeout_clk == 0) {
3301                         if (host->ops->get_timeout_clock) {
3302                                 host->timeout_clk =
3303                                         host->ops->get_timeout_clock(host);
3304                         } else {
3305                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3306                                         mmc_hostname(mmc));
3307                                 ret = -ENODEV;
3308                                 goto undma;
3309                         }
3310                 }
3311
3312                 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
3313                         host->timeout_clk *= 1000;
3314
3315                 if (override_timeout_clk)
3316                         host->timeout_clk = override_timeout_clk;
3317
3318                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3319                         host->ops->get_max_timeout_count(host) : 1 << 27;
3320                 mmc->max_busy_timeout /= host->timeout_clk;
3321         }
3322
3323         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3324         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3325
3326         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3327                 host->flags |= SDHCI_AUTO_CMD12;
3328
3329         /* Auto-CMD23 stuff only works in ADMA or PIO. */
3330         if ((host->version >= SDHCI_SPEC_300) &&
3331             ((host->flags & SDHCI_USE_ADMA) ||
3332              !(host->flags & SDHCI_USE_SDMA)) &&
3333              !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
3334                 host->flags |= SDHCI_AUTO_CMD23;
3335                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
3336         } else {
3337                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
3338         }
3339
3340         /*
3341          * A controller may support 8-bit width, but the board itself
3342          * might not have the pins brought out.  Boards that support
3343          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3344          * their platform code before calling sdhci_add_host(), and we
3345          * won't assume 8-bit width for hosts without that CAP.
3346          */
3347         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3348                 mmc->caps |= MMC_CAP_4_BIT_DATA;
3349
3350         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3351                 mmc->caps &= ~MMC_CAP_CMD23;
3352
3353         if (host->caps & SDHCI_CAN_DO_HISPD)
3354                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3355
3356         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3357             mmc_card_is_removable(mmc) &&
3358             mmc_gpio_get_cd(host->mmc) < 0)
3359                 mmc->caps |= MMC_CAP_NEEDS_POLL;
3360
3361         /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3362         if (!IS_ERR(mmc->supply.vqmmc)) {
3363                 ret = regulator_enable(mmc->supply.vqmmc);
3364                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3365                                                     1950000))
3366                         host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
3367                                          SDHCI_SUPPORT_SDR50 |
3368                                          SDHCI_SUPPORT_DDR50);
3369                 if (ret) {
3370                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3371                                 mmc_hostname(mmc), ret);
3372                         mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3373                 }
3374         }
3375
3376         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
3377                 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3378                                  SDHCI_SUPPORT_DDR50);
3379         }
3380
3381         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3382         if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3383                            SDHCI_SUPPORT_DDR50))
3384                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3385
3386         /* SDR104 supports also implies SDR50 support */
3387         if (host->caps1 & SDHCI_SUPPORT_SDR104) {
3388                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3389                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3390                  * field can be promoted to support HS200.
3391                  */
3392                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3393                         mmc->caps2 |= MMC_CAP2_HS200;
3394         } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
3395                 mmc->caps |= MMC_CAP_UHS_SDR50;
3396         }
3397
3398         if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3399             (host->caps1 & SDHCI_SUPPORT_HS400))
3400                 mmc->caps2 |= MMC_CAP2_HS400;
3401
3402         if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3403             (IS_ERR(mmc->supply.vqmmc) ||
3404              !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3405                                              1300000)))
3406                 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3407
3408         if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
3409             !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3410                 mmc->caps |= MMC_CAP_UHS_DDR50;
3411
3412         /* Does the host need tuning for SDR50? */
3413         if (host->caps1 & SDHCI_USE_SDR50_TUNING)
3414                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3415
3416         /* Driver Type(s) (A, C, D) supported by the host */
3417         if (host->caps1 & SDHCI_DRIVER_TYPE_A)
3418                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3419         if (host->caps1 & SDHCI_DRIVER_TYPE_C)
3420                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3421         if (host->caps1 & SDHCI_DRIVER_TYPE_D)
3422                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3423
3424         /* Initial value for re-tuning timer count */
3425         host->tuning_count = (host->caps1 & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3426                              SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3427
3428         /*
3429          * In case Re-tuning Timer is not disabled, the actual value of
3430          * re-tuning timer will be 2 ^ (n - 1).
3431          */
3432         if (host->tuning_count)
3433                 host->tuning_count = 1 << (host->tuning_count - 1);
3434
3435         /* Re-tuning mode supported by the Host Controller */
3436         host->tuning_mode = (host->caps1 & SDHCI_RETUNING_MODE_MASK) >>
3437                              SDHCI_RETUNING_MODE_SHIFT;
3438
3439         ocr_avail = 0;
3440
3441         /*
3442          * According to SD Host Controller spec v3.00, if the Host System
3443          * can afford more than 150mA, Host Driver should set XPC to 1. Also
3444          * the value is meaningful only if Voltage Support in the Capabilities
3445          * register is set. The actual current value is 4 times the register
3446          * value.
3447          */
3448         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3449         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3450                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3451                 if (curr > 0) {
3452
3453                         /* convert to SDHCI_MAX_CURRENT format */
3454                         curr = curr/1000;  /* convert to mA */
3455                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3456
3457                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3458                         max_current_caps =
3459                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3460                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3461                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3462                 }
3463         }
3464
3465         if (host->caps & SDHCI_CAN_VDD_330) {
3466                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3467
3468                 mmc->max_current_330 = ((max_current_caps &
3469                                    SDHCI_MAX_CURRENT_330_MASK) >>
3470                                    SDHCI_MAX_CURRENT_330_SHIFT) *
3471                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3472         }
3473         if (host->caps & SDHCI_CAN_VDD_300) {
3474                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3475
3476                 mmc->max_current_300 = ((max_current_caps &
3477                                    SDHCI_MAX_CURRENT_300_MASK) >>
3478                                    SDHCI_MAX_CURRENT_300_SHIFT) *
3479                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3480         }
3481         if (host->caps & SDHCI_CAN_VDD_180) {
3482                 ocr_avail |= MMC_VDD_165_195;
3483
3484                 mmc->max_current_180 = ((max_current_caps &
3485                                    SDHCI_MAX_CURRENT_180_MASK) >>
3486                                    SDHCI_MAX_CURRENT_180_SHIFT) *
3487                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3488         }
3489
3490         /* If OCR set by host, use it instead. */
3491         if (host->ocr_mask)
3492                 ocr_avail = host->ocr_mask;
3493
3494         /* If OCR set by external regulators, give it highest prio. */
3495         if (mmc->ocr_avail)
3496                 ocr_avail = mmc->ocr_avail;
3497
3498         mmc->ocr_avail = ocr_avail;
3499         mmc->ocr_avail_sdio = ocr_avail;
3500         if (host->ocr_avail_sdio)
3501                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3502         mmc->ocr_avail_sd = ocr_avail;
3503         if (host->ocr_avail_sd)
3504                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3505         else /* normal SD controllers don't support 1.8V */
3506                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3507         mmc->ocr_avail_mmc = ocr_avail;
3508         if (host->ocr_avail_mmc)
3509                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3510
3511         if (mmc->ocr_avail == 0) {
3512                 pr_err("%s: Hardware doesn't report any support voltages.\n",
3513                        mmc_hostname(mmc));
3514                 ret = -ENODEV;
3515                 goto unreg;
3516         }
3517
3518         if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
3519                           MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
3520                           MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
3521             (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
3522                 host->flags |= SDHCI_SIGNALING_180;
3523
3524         if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
3525                 host->flags |= SDHCI_SIGNALING_120;
3526
3527         spin_lock_init(&host->lock);
3528
3529         /*
3530          * Maximum number of segments. Depends on if the hardware
3531          * can do scatter/gather or not.
3532          */
3533         if (host->flags & SDHCI_USE_ADMA)
3534                 mmc->max_segs = SDHCI_MAX_SEGS;
3535         else if (host->flags & SDHCI_USE_SDMA)
3536                 mmc->max_segs = 1;
3537         else /* PIO */
3538                 mmc->max_segs = SDHCI_MAX_SEGS;
3539
3540         /*
3541          * Maximum number of sectors in one transfer. Limited by SDMA boundary
3542          * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3543          * is less anyway.
3544          */
3545         mmc->max_req_size = 524288;
3546
3547         /*
3548          * Maximum segment size. Could be one segment with the maximum number
3549          * of bytes. When doing hardware scatter/gather, each entry cannot
3550          * be larger than 64 KiB though.
3551          */
3552         if (host->flags & SDHCI_USE_ADMA) {
3553                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3554                         mmc->max_seg_size = 65535;
3555                 else
3556                         mmc->max_seg_size = 65536;
3557         } else {
3558                 mmc->max_seg_size = mmc->max_req_size;
3559         }
3560
3561         /*
3562          * Maximum block size. This varies from controller to controller and
3563          * is specified in the capabilities register.
3564          */
3565         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3566                 mmc->max_blk_size = 2;
3567         } else {
3568                 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
3569                                 SDHCI_MAX_BLOCK_SHIFT;
3570                 if (mmc->max_blk_size >= 3) {
3571                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3572                                 mmc_hostname(mmc));
3573                         mmc->max_blk_size = 0;
3574                 }
3575         }
3576
3577         mmc->max_blk_size = 512 << mmc->max_blk_size;
3578
3579         /*
3580          * Maximum block count.
3581          */
3582         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3583
3584         return 0;
3585
3586 unreg:
3587         if (!IS_ERR(mmc->supply.vqmmc))
3588                 regulator_disable(mmc->supply.vqmmc);
3589 undma:
3590         if (host->align_buffer)
3591                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3592                                   host->adma_table_sz, host->align_buffer,
3593                                   host->align_addr);
3594         host->adma_table = NULL;
3595         host->align_buffer = NULL;
3596
3597         return ret;
3598 }
3599 EXPORT_SYMBOL_GPL(sdhci_setup_host);
3600
3601 int __sdhci_add_host(struct sdhci_host *host)
3602 {
3603         struct mmc_host *mmc = host->mmc;
3604         int ret;
3605
3606         /*
3607          * Init tasklets.
3608          */
3609         tasklet_init(&host->finish_tasklet,
3610                 sdhci_tasklet_finish, (unsigned long)host);
3611
3612         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3613         setup_timer(&host->data_timer, sdhci_timeout_data_timer,
3614                     (unsigned long)host);
3615
3616         init_waitqueue_head(&host->buf_ready_int);
3617
3618         sdhci_init(host, 0);
3619
3620         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3621                                    IRQF_SHARED, mmc_hostname(mmc), host);
3622         if (ret) {
3623                 pr_err("%s: Failed to request IRQ %d: %d\n",
3624                        mmc_hostname(mmc), host->irq, ret);
3625                 goto untasklet;
3626         }
3627
3628 #ifdef CONFIG_MMC_DEBUG
3629         sdhci_dumpregs(host);
3630 #endif
3631
3632         ret = sdhci_led_register(host);
3633         if (ret) {
3634                 pr_err("%s: Failed to register LED device: %d\n",
3635                        mmc_hostname(mmc), ret);
3636                 goto unirq;
3637         }
3638
3639         mmiowb();
3640
3641         ret = mmc_add_host(mmc);
3642         if (ret)
3643                 goto unled;
3644
3645         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3646                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3647                 (host->flags & SDHCI_USE_ADMA) ?
3648                 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3649                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3650
3651         sdhci_enable_card_detection(host);
3652
3653         return 0;
3654
3655 unled:
3656         sdhci_led_unregister(host);
3657 unirq:
3658         sdhci_do_reset(host, SDHCI_RESET_ALL);
3659         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3660         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3661         free_irq(host->irq, host);
3662 untasklet:
3663         tasklet_kill(&host->finish_tasklet);
3664
3665         if (!IS_ERR(mmc->supply.vqmmc))
3666                 regulator_disable(mmc->supply.vqmmc);
3667
3668         if (host->align_buffer)
3669                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3670                                   host->adma_table_sz, host->align_buffer,
3671                                   host->align_addr);
3672         host->adma_table = NULL;
3673         host->align_buffer = NULL;
3674
3675         return ret;
3676 }
3677 EXPORT_SYMBOL_GPL(__sdhci_add_host);
3678
3679 int sdhci_add_host(struct sdhci_host *host)
3680 {
3681         int ret;
3682
3683         ret = sdhci_setup_host(host);
3684         if (ret)
3685                 return ret;
3686
3687         return __sdhci_add_host(host);
3688 }
3689 EXPORT_SYMBOL_GPL(sdhci_add_host);
3690
3691 void sdhci_remove_host(struct sdhci_host *host, int dead)
3692 {
3693         struct mmc_host *mmc = host->mmc;
3694         unsigned long flags;
3695
3696         if (dead) {
3697                 spin_lock_irqsave(&host->lock, flags);
3698
3699                 host->flags |= SDHCI_DEVICE_DEAD;
3700
3701                 if (sdhci_has_requests(host)) {
3702                         pr_err("%s: Controller removed during "
3703                                 " transfer!\n", mmc_hostname(mmc));
3704                         sdhci_error_out_mrqs(host, -ENOMEDIUM);
3705                 }
3706
3707                 spin_unlock_irqrestore(&host->lock, flags);
3708         }
3709
3710         sdhci_disable_card_detection(host);
3711
3712         mmc_remove_host(mmc);
3713
3714         sdhci_led_unregister(host);
3715
3716         if (!dead)
3717                 sdhci_do_reset(host, SDHCI_RESET_ALL);
3718
3719         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3720         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3721         free_irq(host->irq, host);
3722
3723         del_timer_sync(&host->timer);
3724         del_timer_sync(&host->data_timer);
3725
3726         tasklet_kill(&host->finish_tasklet);
3727
3728         if (!IS_ERR(mmc->supply.vqmmc))
3729                 regulator_disable(mmc->supply.vqmmc);
3730
3731         if (host->align_buffer)
3732                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3733                                   host->adma_table_sz, host->align_buffer,
3734                                   host->align_addr);
3735
3736         host->adma_table = NULL;
3737         host->align_buffer = NULL;
3738 }
3739
3740 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3741
3742 void sdhci_free_host(struct sdhci_host *host)
3743 {
3744         mmc_free_host(host->mmc);
3745 }
3746
3747 EXPORT_SYMBOL_GPL(sdhci_free_host);
3748
3749 /*****************************************************************************\
3750  *                                                                           *
3751  * Driver init/exit                                                          *
3752  *                                                                           *
3753 \*****************************************************************************/
3754
3755 static int __init sdhci_drv_init(void)
3756 {
3757         pr_info(DRIVER_NAME
3758                 ": Secure Digital Host Controller Interface driver\n");
3759         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3760
3761         return 0;
3762 }
3763
3764 static void __exit sdhci_drv_exit(void)
3765 {
3766 }
3767
3768 module_init(sdhci_drv_init);
3769 module_exit(sdhci_drv_exit);
3770
3771 module_param(debug_quirks, uint, 0444);
3772 module_param(debug_quirks2, uint, 0444);
3773
3774 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3775 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3776 MODULE_LICENSE("GPL");
3777
3778 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3779 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");