drivers/mmc/host/sdhci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
   4  *
   5  *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
   6  *
   7  * Thanks to the following companies for their support:
   8  *
   9  *     - JMicron (hardware and technical support)
  10  */
  11
  12 #include <linux/bitfield.h>
  13 #include <linux/delay.h>
  14 #include <linux/dmaengine.h>
  15 #include <linux/ktime.h>
  16 #include <linux/highmem.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/slab.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/sizes.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("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
  41
  42 #define SDHCI_DUMP(f, x...) \
  43         pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
  44
  45 #define MAX_TUNING_LOOP 40
  46
  47 static unsigned int debug_quirks = 0;
  48 static unsigned int debug_quirks2;
  49
  50 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
  51
  52 static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
  53
  54 void sdhci_dumpregs(struct sdhci_host *host)
  55 {
  56         SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n");
  57
  58         SDHCI_DUMP("Sys addr:  0x%08x | Version:  0x%08x\n",
  59                    sdhci_readl(host, SDHCI_DMA_ADDRESS),
  60                    sdhci_readw(host, SDHCI_HOST_VERSION));
  61         SDHCI_DUMP("Blk size:  0x%08x | Blk cnt:  0x%08x\n",
  62                    sdhci_readw(host, SDHCI_BLOCK_SIZE),
  63                    sdhci_readw(host, SDHCI_BLOCK_COUNT));
  64         SDHCI_DUMP("Argument:  0x%08x | Trn mode: 0x%08x\n",
  65                    sdhci_readl(host, SDHCI_ARGUMENT),
  66                    sdhci_readw(host, SDHCI_TRANSFER_MODE));
  67         SDHCI_DUMP("Present:   0x%08x | Host ctl: 0x%08x\n",
  68                    sdhci_readl(host, SDHCI_PRESENT_STATE),
  69                    sdhci_readb(host, SDHCI_HOST_CONTROL));
  70         SDHCI_DUMP("Power:     0x%08x | Blk gap:  0x%08x\n",
  71                    sdhci_readb(host, SDHCI_POWER_CONTROL),
  72                    sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
  73         SDHCI_DUMP("Wake-up:   0x%08x | Clock:    0x%08x\n",
  74                    sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
  75                    sdhci_readw(host, SDHCI_CLOCK_CONTROL));
  76         SDHCI_DUMP("Timeout:   0x%08x | Int stat: 0x%08x\n",
  77                    sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
  78                    sdhci_readl(host, SDHCI_INT_STATUS));
  79         SDHCI_DUMP("Int enab:  0x%08x | Sig enab: 0x%08x\n",
  80                    sdhci_readl(host, SDHCI_INT_ENABLE),
  81                    sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
  82         SDHCI_DUMP("ACmd stat: 0x%08x | Slot int: 0x%08x\n",
  83                    sdhci_readw(host, SDHCI_AUTO_CMD_STATUS),
  84                    sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
  85         SDHCI_DUMP("Caps:      0x%08x | Caps_1:   0x%08x\n",
  86                    sdhci_readl(host, SDHCI_CAPABILITIES),
  87                    sdhci_readl(host, SDHCI_CAPABILITIES_1));
  88         SDHCI_DUMP("Cmd:       0x%08x | Max curr: 0x%08x\n",
  89                    sdhci_readw(host, SDHCI_COMMAND),
  90                    sdhci_readl(host, SDHCI_MAX_CURRENT));
  91         SDHCI_DUMP("Resp[0]:   0x%08x | Resp[1]:  0x%08x\n",
  92                    sdhci_readl(host, SDHCI_RESPONSE),
  93                    sdhci_readl(host, SDHCI_RESPONSE + 4));
  94         SDHCI_DUMP("Resp[2]:   0x%08x | Resp[3]:  0x%08x\n",
  95                    sdhci_readl(host, SDHCI_RESPONSE + 8),
  96                    sdhci_readl(host, SDHCI_RESPONSE + 12));
  97         SDHCI_DUMP("Host ctl2: 0x%08x\n",
  98                    sdhci_readw(host, SDHCI_HOST_CONTROL2));
  99
 100         if (host->flags & SDHCI_USE_ADMA) {
 101                 if (host->flags & SDHCI_USE_64_BIT_DMA) {
 102                         SDHCI_DUMP("ADMA Err:  0x%08x | ADMA Ptr: 0x%08x%08x\n",
 103                                    sdhci_readl(host, SDHCI_ADMA_ERROR),
 104                                    sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI),
 105                                    sdhci_readl(host, SDHCI_ADMA_ADDRESS));
 106                 } else {
 107                         SDHCI_DUMP("ADMA Err:  0x%08x | ADMA Ptr: 0x%08x\n",
 108                                    sdhci_readl(host, SDHCI_ADMA_ERROR),
 109                                    sdhci_readl(host, SDHCI_ADMA_ADDRESS));
 110                 }
 111         }
 112
 113         if (host->ops->dump_vendor_regs)
 114                 host->ops->dump_vendor_regs(host);
 115
 116         SDHCI_DUMP("============================================\n");
 117 }
 118 EXPORT_SYMBOL_GPL(sdhci_dumpregs);
 119
 120 /*****************************************************************************\
 121  *                                                                           *
 122  * Low level functions                                                       *
 123  *                                                                           *
 124 \*****************************************************************************/
 125
 126 static void sdhci_do_enable_v4_mode(struct sdhci_host *host)
 127 {
 128         u16 ctrl2;
 129
 130         ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 131         if (ctrl2 & SDHCI_CTRL_V4_MODE)
 132                 return;
 133
 134         ctrl2 |= SDHCI_CTRL_V4_MODE;
 135         sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
 136 }
 137
 138 /*
 139  * This can be called before sdhci_add_host() by Vendor's host controller
 140  * driver to enable v4 mode if supported.
 141  */
 142 void sdhci_enable_v4_mode(struct sdhci_host *host)
 143 {
 144         host->v4_mode = true;
 145         sdhci_do_enable_v4_mode(host);
 146 }
 147 EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode);
 148
 149 static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
 150 {
 151         return cmd->data || cmd->flags & MMC_RSP_BUSY;
 152 }
 153
 154 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
 155 {
 156         u32 present;
 157
 158         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
 159             !mmc_card_is_removable(host->mmc) || mmc_can_gpio_cd(host->mmc))
 160                 return;
 161
 162         if (enable) {
 163                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
 164                                       SDHCI_CARD_PRESENT;
 165
 166                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
 167                                        SDHCI_INT_CARD_INSERT;
 168         } else {
 169                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
 170         }
 171
 172         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 173         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 174 }
 175
 176 static void sdhci_enable_card_detection(struct sdhci_host *host)
 177 {
 178         sdhci_set_card_detection(host, true);
 179 }
 180
 181 static void sdhci_disable_card_detection(struct sdhci_host *host)
 182 {
 183         sdhci_set_card_detection(host, false);
 184 }
 185
 186 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 187 {
 188         if (host->bus_on)
 189                 return;
 190         host->bus_on = true;
 191         pm_runtime_get_noresume(mmc_dev(host->mmc));
 192 }
 193
 194 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 195 {
 196         if (!host->bus_on)
 197                 return;
 198         host->bus_on = false;
 199         pm_runtime_put_noidle(mmc_dev(host->mmc));
 200 }
 201
 202 void sdhci_reset(struct sdhci_host *host, u8 mask)
 203 {
 204         ktime_t timeout;
 205
 206         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 207
 208         if (mask & SDHCI_RESET_ALL) {
 209                 host->clock = 0;
 210                 /* Reset-all turns off SD Bus Power */
 211                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
 212                         sdhci_runtime_pm_bus_off(host);
 213         }
 214
 215         /* Wait max 100 ms */
 216         timeout = ktime_add_ms(ktime_get(), 100);
 217
 218         /* hw clears the bit when it's done */
 219         while (1) {
 220                 bool timedout = ktime_after(ktime_get(), timeout);
 221
 222                 if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
 223                         break;
 224                 if (timedout) {
 225                         pr_err("%s: Reset 0x%x never completed.\n",
 226                                 mmc_hostname(host->mmc), (int)mask);
 227                         sdhci_dumpregs(host);
 228                         return;
 229                 }
 230                 udelay(10);
 231         }
 232 }
 233 EXPORT_SYMBOL_GPL(sdhci_reset);
 234
 235 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
 236 {
 237         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 238                 struct mmc_host *mmc = host->mmc;
 239
 240                 if (!mmc->ops->get_cd(mmc))
 241                         return;
 242         }
 243
 244         host->ops->reset(host, mask);
 245
 246         if (mask & SDHCI_RESET_ALL) {
 247                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 248                         if (host->ops->enable_dma)
 249                                 host->ops->enable_dma(host);
 250                 }
 251
 252                 /* Resetting the controller clears many */
 253                 host->preset_enabled = false;
 254         }
 255 }
 256
 257 static void sdhci_set_default_irqs(struct sdhci_host *host)
 258 {
 259         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 260                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
 261                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
 262                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
 263                     SDHCI_INT_RESPONSE;
 264
 265         if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
 266             host->tuning_mode == SDHCI_TUNING_MODE_3)
 267                 host->ier |= SDHCI_INT_RETUNE;
 268
 269         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 270         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 271 }
 272
 273 static void sdhci_config_dma(struct sdhci_host *host)
 274 {
 275         u8 ctrl;
 276         u16 ctrl2;
 277
 278         if (host->version < SDHCI_SPEC_200)
 279                 return;
 280
 281         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 282
 283         /*
 284          * Always adjust the DMA selection as some controllers
 285          * (e.g. JMicron) can't do PIO properly when the selection
 286          * is ADMA.
 287          */
 288         ctrl &= ~SDHCI_CTRL_DMA_MASK;
 289         if (!(host->flags & SDHCI_REQ_USE_DMA))
 290                 goto out;
 291
 292         /* Note if DMA Select is zero then SDMA is selected */
 293         if (host->flags & SDHCI_USE_ADMA)
 294                 ctrl |= SDHCI_CTRL_ADMA32;
 295
 296         if (host->flags & SDHCI_USE_64_BIT_DMA) {
 297                 /*
 298                  * If v4 mode, all supported DMA can be 64-bit addressing if
 299                  * controller supports 64-bit system address, otherwise only
 300                  * ADMA can support 64-bit addressing.
 301                  */
 302                 if (host->v4_mode) {
 303                         ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 304                         ctrl2 |= SDHCI_CTRL_64BIT_ADDR;
 305                         sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
 306                 } else if (host->flags & SDHCI_USE_ADMA) {
 307                         /*
 308                          * Don't need to undo SDHCI_CTRL_ADMA32 in order to
 309                          * set SDHCI_CTRL_ADMA64.
 310                          */
 311                         ctrl |= SDHCI_CTRL_ADMA64;
 312                 }
 313         }
 314
 315 out:
 316         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 317 }
 318
 319 static void sdhci_init(struct sdhci_host *host, int soft)
 320 {
 321         struct mmc_host *mmc = host->mmc;
 322         unsigned long flags;
 323
 324         if (soft)
 325                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
 326         else
 327                 sdhci_do_reset(host, SDHCI_RESET_ALL);
 328
 329         if (host->v4_mode)
 330                 sdhci_do_enable_v4_mode(host);
 331
 332         spin_lock_irqsave(&host->lock, flags);
 333         sdhci_set_default_irqs(host);
 334         spin_unlock_irqrestore(&host->lock, flags);
 335
 336         host->cqe_on = false;
 337
 338         if (soft) {
 339                 /* force clock reconfiguration */
 340                 host->clock = 0;
 341                 mmc->ops->set_ios(mmc, &mmc->ios);
 342         }
 343 }
 344
 345 static void sdhci_reinit(struct sdhci_host *host)
 346 {
 347         u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
 348
 349         sdhci_init(host, 0);
 350         sdhci_enable_card_detection(host);
 351
 352         /*
 353          * A change to the card detect bits indicates a change in present state,
 354          * refer sdhci_set_card_detection(). A card detect interrupt might have
 355          * been missed while the host controller was being reset, so trigger a
 356          * rescan to check.
 357          */
 358         if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT)))
 359                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
 360 }
 361
 362 static void __sdhci_led_activate(struct sdhci_host *host)
 363 {
 364         u8 ctrl;
 365
 366         if (host->quirks & SDHCI_QUIRK_NO_LED)
 367                 return;
 368
 369         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 370         ctrl |= SDHCI_CTRL_LED;
 371         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 372 }
 373
 374 static void __sdhci_led_deactivate(struct sdhci_host *host)
 375 {
 376         u8 ctrl;
 377
 378         if (host->quirks & SDHCI_QUIRK_NO_LED)
 379                 return;
 380
 381         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 382         ctrl &= ~SDHCI_CTRL_LED;
 383         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 384 }
 385
 386 #if IS_REACHABLE(CONFIG_LEDS_CLASS)
 387 static void sdhci_led_control(struct led_classdev *led,
 388                               enum led_brightness brightness)
 389 {
 390         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 391         unsigned long flags;
 392
 393         spin_lock_irqsave(&host->lock, flags);
 394
 395         if (host->runtime_suspended)
 396                 goto out;
 397
 398         if (brightness == LED_OFF)
 399                 __sdhci_led_deactivate(host);
 400         else
 401                 __sdhci_led_activate(host);
 402 out:
 403         spin_unlock_irqrestore(&host->lock, flags);
 404 }
 405
 406 static int sdhci_led_register(struct sdhci_host *host)
 407 {
 408         struct mmc_host *mmc = host->mmc;
 409
 410         if (host->quirks & SDHCI_QUIRK_NO_LED)
 411                 return 0;
 412
 413         snprintf(host->led_name, sizeof(host->led_name),
 414                  "%s::", mmc_hostname(mmc));
 415
 416         host->led.name = host->led_name;
 417         host->led.brightness = LED_OFF;
 418         host->led.default_trigger = mmc_hostname(mmc);
 419         host->led.brightness_set = sdhci_led_control;
 420
 421         return led_classdev_register(mmc_dev(mmc), &host->led);
 422 }
 423
 424 static void sdhci_led_unregister(struct sdhci_host *host)
 425 {
 426         if (host->quirks & SDHCI_QUIRK_NO_LED)
 427                 return;
 428
 429         led_classdev_unregister(&host->led);
 430 }
 431
 432 static inline void sdhci_led_activate(struct sdhci_host *host)
 433 {
 434 }
 435
 436 static inline void sdhci_led_deactivate(struct sdhci_host *host)
 437 {
 438 }
 439
 440 #else
 441
 442 static inline int sdhci_led_register(struct sdhci_host *host)
 443 {
 444         return 0;
 445 }
 446
 447 static inline void sdhci_led_unregister(struct sdhci_host *host)
 448 {
 449 }
 450
 451 static inline void sdhci_led_activate(struct sdhci_host *host)
 452 {
 453         __sdhci_led_activate(host);
 454 }
 455
 456 static inline void sdhci_led_deactivate(struct sdhci_host *host)
 457 {
 458         __sdhci_led_deactivate(host);
 459 }
 460
 461 #endif
 462
 463 static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
 464                             unsigned long timeout)
 465 {
 466         if (sdhci_data_line_cmd(mrq->cmd))
 467                 mod_timer(&host->data_timer, timeout);
 468         else
 469                 mod_timer(&host->timer, timeout);
 470 }
 471
 472 static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
 473 {
 474         if (sdhci_data_line_cmd(mrq->cmd))
 475                 del_timer(&host->data_timer);
 476         else
 477                 del_timer(&host->timer);
 478 }
 479
 480 static inline bool sdhci_has_requests(struct sdhci_host *host)
 481 {
 482         return host->cmd || host->data_cmd;
 483 }
 484
 485 /*****************************************************************************\
 486  *                                                                           *
 487  * Core functions                                                            *
 488  *                                                                           *
 489 \*****************************************************************************/
 490
 491 static void sdhci_read_block_pio(struct sdhci_host *host)
 492 {
 493         unsigned long flags;
 494         size_t blksize, len, chunk;
 495         u32 scratch;
 496         u8 *buf;
 497
 498         DBG("PIO reading\n");
 499
 500         blksize = host->data->blksz;
 501         chunk = 0;
 502
 503         local_irq_save(flags);
 504
 505         while (blksize) {
 506                 BUG_ON(!sg_miter_next(&host->sg_miter));
 507
 508                 len = min(host->sg_miter.length, blksize);
 509
 510                 blksize -= len;
 511                 host->sg_miter.consumed = len;
 512
 513                 buf = host->sg_miter.addr;
 514
 515                 while (len) {
 516                         if (chunk == 0) {
 517                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
 518                                 chunk = 4;
 519                         }
 520
 521                         *buf = scratch & 0xFF;
 522
 523                         buf++;
 524                         scratch >>= 8;
 525                         chunk--;
 526                         len--;
 527                 }
 528         }
 529
 530         sg_miter_stop(&host->sg_miter);
 531
 532         local_irq_restore(flags);
 533 }
 534
 535 static void sdhci_write_block_pio(struct sdhci_host *host)
 536 {
 537         unsigned long flags;
 538         size_t blksize, len, chunk;
 539         u32 scratch;
 540         u8 *buf;
 541
 542         DBG("PIO writing\n");
 543
 544         blksize = host->data->blksz;
 545         chunk = 0;
 546         scratch = 0;
 547
 548         local_irq_save(flags);
 549
 550         while (blksize) {
 551                 BUG_ON(!sg_miter_next(&host->sg_miter));
 552
 553                 len = min(host->sg_miter.length, blksize);
 554
 555                 blksize -= len;
 556                 host->sg_miter.consumed = len;
 557
 558                 buf = host->sg_miter.addr;
 559
 560                 while (len) {
 561                         scratch |= (u32)*buf << (chunk * 8);
 562
 563                         buf++;
 564                         chunk++;
 565                         len--;
 566
 567                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 568                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
 569                                 chunk = 0;
 570                                 scratch = 0;
 571                         }
 572                 }
 573         }
 574
 575         sg_miter_stop(&host->sg_miter);
 576
 577         local_irq_restore(flags);
 578 }
 579
 580 static void sdhci_transfer_pio(struct sdhci_host *host)
 581 {
 582         u32 mask;
 583
 584         if (host->blocks == 0)
 585                 return;
 586
 587         if (host->data->flags & MMC_DATA_READ)
 588                 mask = SDHCI_DATA_AVAILABLE;
 589         else
 590                 mask = SDHCI_SPACE_AVAILABLE;
 591
 592         /*
 593          * Some controllers (JMicron JMB38x) mess up the buffer bits
 594          * for transfers < 4 bytes. As long as it is just one block,
 595          * we can ignore the bits.
 596          */
 597         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
 598                 (host->data->blocks == 1))
 599                 mask = ~0;
 600
 601         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 602                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 603                         udelay(100);
 604
 605                 if (host->data->flags & MMC_DATA_READ)
 606                         sdhci_read_block_pio(host);
 607                 else
 608                         sdhci_write_block_pio(host);
 609
 610                 host->blocks--;
 611                 if (host->blocks == 0)
 612                         break;
 613         }
 614
 615         DBG("PIO transfer complete.\n");
 616 }
 617
 618 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
 619                                   struct mmc_data *data, int cookie)
 620 {
 621         int sg_count;
 622
 623         /*
 624          * If the data buffers are already mapped, return the previous
 625          * dma_map_sg() result.
 626          */
 627         if (data->host_cookie == COOKIE_PRE_MAPPED)
 628                 return data->sg_count;
 629
 630         /* Bounce write requests to the bounce buffer */
 631         if (host->bounce_buffer) {
 632                 unsigned int length = data->blksz * data->blocks;
 633
 634                 if (length > host->bounce_buffer_size) {
 635                         pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n",
 636                                mmc_hostname(host->mmc), length,
 637                                host->bounce_buffer_size);
 638                         return -EIO;
 639                 }
 640                 if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
 641                         /* Copy the data to the bounce buffer */
 642                         if (host->ops->copy_to_bounce_buffer) {
 643                                 host->ops->copy_to_bounce_buffer(host,
 644                                                                  data, length);
 645                         } else {
 646                                 sg_copy_to_buffer(data->sg, data->sg_len,
 647                                                   host->bounce_buffer, length);
 648                         }
 649                 }
 650                 /* Switch ownership to the DMA */
 651                 dma_sync_single_for_device(mmc_dev(host->mmc),
 652                                            host->bounce_addr,
 653                                            host->bounce_buffer_size,
 654                                            mmc_get_dma_dir(data));
 655                 /* Just a dummy value */
 656                 sg_count = 1;
 657         } else {
 658                 /* Just access the data directly from memory */
 659                 sg_count = dma_map_sg(mmc_dev(host->mmc),
 660                                       data->sg, data->sg_len,
 661                                       mmc_get_dma_dir(data));
 662         }
 663
 664         if (sg_count == 0)
 665                 return -ENOSPC;
 666
 667         data->sg_count = sg_count;
 668         data->host_cookie = cookie;
 669
 670         return sg_count;
 671 }
 672
 673 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 674 {
 675         local_irq_save(*flags);
 676         return kmap_atomic(sg_page(sg)) + sg->offset;
 677 }
 678
 679 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 680 {
 681         kunmap_atomic(buffer);
 682         local_irq_restore(*flags);
 683 }
 684
 685 void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
 686                            dma_addr_t addr, int len, unsigned int cmd)
 687 {
 688         struct sdhci_adma2_64_desc *dma_desc = *desc;
 689
 690         /* 32-bit and 64-bit descriptors have these members in same position */
 691         dma_desc->cmd = cpu_to_le16(cmd);
 692         dma_desc->len = cpu_to_le16(len);
 693         dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr));
 694
 695         if (host->flags & SDHCI_USE_64_BIT_DMA)
 696                 dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr));
 697
 698         *desc += host->desc_sz;
 699 }
 700 EXPORT_SYMBOL_GPL(sdhci_adma_write_desc);
 701
 702 static inline void __sdhci_adma_write_desc(struct sdhci_host *host,
 703                                            void **desc, dma_addr_t addr,
 704                                            int len, unsigned int cmd)
 705 {
 706         if (host->ops->adma_write_desc)
 707                 host->ops->adma_write_desc(host, desc, addr, len, cmd);
 708         else
 709                 sdhci_adma_write_desc(host, desc, addr, len, cmd);
 710 }
 711
 712 static void sdhci_adma_mark_end(void *desc)
 713 {
 714         struct sdhci_adma2_64_desc *dma_desc = desc;
 715
 716         /* 32-bit and 64-bit descriptors have 'cmd' in same position */
 717         dma_desc->cmd |= cpu_to_le16(ADMA2_END);
 718 }
 719
 720 static void sdhci_adma_table_pre(struct sdhci_host *host,
 721         struct mmc_data *data, int sg_count)
 722 {
 723         struct scatterlist *sg;
 724         unsigned long flags;
 725         dma_addr_t addr, align_addr;
 726         void *desc, *align;
 727         char *buffer;
 728         int len, offset, i;
 729
 730         /*
 731          * The spec does not specify endianness of descriptor table.
 732          * We currently guess that it is LE.
 733          */
 734
 735         host->sg_count = sg_count;
 736
 737         desc = host->adma_table;
 738         align = host->align_buffer;
 739
 740         align_addr = host->align_addr;
 741
 742         for_each_sg(data->sg, sg, host->sg_count, i) {
 743                 addr = sg_dma_address(sg);
 744                 len = sg_dma_len(sg);
 745
 746                 /*
 747                  * The SDHCI specification states that ADMA addresses must
 748                  * be 32-bit aligned. If they aren't, then we use a bounce
 749                  * buffer for the (up to three) bytes that screw up the
 750                  * alignment.
 751                  */
 752                 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
 753                          SDHCI_ADMA2_MASK;
 754                 if (offset) {
 755                         if (data->flags & MMC_DATA_WRITE) {
 756                                 buffer = sdhci_kmap_atomic(sg, &flags);
 757                                 memcpy(align, buffer, offset);
 758                                 sdhci_kunmap_atomic(buffer, &flags);
 759                         }
 760
 761                         /* tran, valid */
 762                         __sdhci_adma_write_desc(host, &desc, align_addr,
 763                                                 offset, ADMA2_TRAN_VALID);
 764
 765                         BUG_ON(offset > 65536);
 766
 767                         align += SDHCI_ADMA2_ALIGN;
 768                         align_addr += SDHCI_ADMA2_ALIGN;
 769
 770                         addr += offset;
 771                         len -= offset;
 772                 }
 773
 774                 BUG_ON(len > 65536);
 775
 776                 /* tran, valid */
 777                 if (len)
 778                         __sdhci_adma_write_desc(host, &desc, addr, len,
 779                                                 ADMA2_TRAN_VALID);
 780
 781                 /*
 782                  * If this triggers then we have a calculation bug
 783                  * somewhere. :/
 784                  */
 785                 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
 786         }
 787
 788         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
 789                 /* Mark the last descriptor as the terminating descriptor */
 790                 if (desc != host->adma_table) {
 791                         desc -= host->desc_sz;
 792                         sdhci_adma_mark_end(desc);
 793                 }
 794         } else {
 795                 /* Add a terminating entry - nop, end, valid */
 796                 __sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID);
 797         }
 798 }
 799
 800 static void sdhci_adma_table_post(struct sdhci_host *host,
 801         struct mmc_data *data)
 802 {
 803         struct scatterlist *sg;
 804         int i, size;
 805         void *align;
 806         char *buffer;
 807         unsigned long flags;
 808
 809         if (data->flags & MMC_DATA_READ) {
 810                 bool has_unaligned = false;
 811
 812                 /* Do a quick scan of the SG list for any unaligned mappings */
 813                 for_each_sg(data->sg, sg, host->sg_count, i)
 814                         if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 815                                 has_unaligned = true;
 816                                 break;
 817                         }
 818
 819                 if (has_unaligned) {
 820                         dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 821                                             data->sg_len, DMA_FROM_DEVICE);
 822
 823                         align = host->align_buffer;
 824
 825                         for_each_sg(data->sg, sg, host->sg_count, i) {
 826                                 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 827                                         size = SDHCI_ADMA2_ALIGN -
 828                                                (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
 829
 830                                         buffer = sdhci_kmap_atomic(sg, &flags);
 831                                         memcpy(buffer, align, size);
 832                                         sdhci_kunmap_atomic(buffer, &flags);
 833
 834                                         align += SDHCI_ADMA2_ALIGN;
 835                                 }
 836                         }
 837                 }
 838         }
 839 }
 840
 841 static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr)
 842 {
 843         sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS);
 844         if (host->flags & SDHCI_USE_64_BIT_DMA)
 845                 sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI);
 846 }
 847
 848 static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
 849 {
 850         if (host->bounce_buffer)
 851                 return host->bounce_addr;
 852         else
 853                 return sg_dma_address(host->data->sg);
 854 }
 855
 856 static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
 857 {
 858         if (host->v4_mode)
 859                 sdhci_set_adma_addr(host, addr);
 860         else
 861                 sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
 862 }
 863
 864 static unsigned int sdhci_target_timeout(struct sdhci_host *host,
 865                                          struct mmc_command *cmd,
 866                                          struct mmc_data *data)
 867 {
 868         unsigned int target_timeout;
 869
 870         /* timeout in us */
 871         if (!data) {
 872                 target_timeout = cmd->busy_timeout * 1000;
 873         } else {
 874                 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
 875                 if (host->clock && data->timeout_clks) {
 876                         unsigned long long val;
 877
 878                         /*
 879                          * data->timeout_clks is in units of clock cycles.
 880                          * host->clock is in Hz.  target_timeout is in us.
 881                          * Hence, us = 1000000 * cycles / Hz.  Round up.
 882                          */
 883                         val = 1000000ULL * data->timeout_clks;
 884                         if (do_div(val, host->clock))
 885                                 target_timeout++;
 886                         target_timeout += val;
 887                 }
 888         }
 889
 890         return target_timeout;
 891 }
 892
 893 static void sdhci_calc_sw_timeout(struct sdhci_host *host,
 894                                   struct mmc_command *cmd)
 895 {
 896         struct mmc_data *data = cmd->data;
 897         struct mmc_host *mmc = host->mmc;
 898         struct mmc_ios *ios = &mmc->ios;
 899         unsigned char bus_width = 1 << ios->bus_width;
 900         unsigned int blksz;
 901         unsigned int freq;
 902         u64 target_timeout;
 903         u64 transfer_time;
 904
 905         target_timeout = sdhci_target_timeout(host, cmd, data);
 906         target_timeout *= NSEC_PER_USEC;
 907
 908         if (data) {
 909                 blksz = data->blksz;
 910                 freq = mmc->actual_clock ? : host->clock;
 911                 transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width);
 912                 do_div(transfer_time, freq);
 913                 /* multiply by '2' to account for any unknowns */
 914                 transfer_time = transfer_time * 2;
 915                 /* calculate timeout for the entire data */
 916                 host->data_timeout = data->blocks * target_timeout +
 917                                      transfer_time;
 918         } else {
 919                 host->data_timeout = target_timeout;
 920         }
 921
 922         if (host->data_timeout)
 923                 host->data_timeout += MMC_CMD_TRANSFER_TIME;
 924 }
 925
 926 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd,
 927                              bool *too_big)
 928 {
 929         u8 count;
 930         struct mmc_data *data;
 931         unsigned target_timeout, current_timeout;
 932
 933         *too_big = true;
 934
 935         /*
 936          * If the host controller provides us with an incorrect timeout
 937          * value, just skip the check and use 0xE.  The hardware may take
 938          * longer to time out, but that's much better than having a too-short
 939          * timeout value.
 940          */
 941         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
 942                 return 0xE;
 943
 944         /* Unspecified command, asume max */
 945         if (cmd == NULL)
 946                 return 0xE;
 947
 948         data = cmd->data;
 949         /* Unspecified timeout, assume max */
 950         if (!data && !cmd->busy_timeout)
 951                 return 0xE;
 952
 953         /* timeout in us */
 954         target_timeout = sdhci_target_timeout(host, cmd, data);
 955
 956         /*
 957          * Figure out needed cycles.
 958          * We do this in steps in order to fit inside a 32 bit int.
 959          * The first step is the minimum timeout, which will have a
 960          * minimum resolution of 6 bits:
 961          * (1) 2^13*1000 > 2^22,
 962          * (2) host->timeout_clk < 2^16
 963          *     =>
 964          *     (1) / (2) > 2^6
 965          */
 966         count = 0;
 967         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 968         while (current_timeout < target_timeout) {
 969                 count++;
 970                 current_timeout <<= 1;
 971                 if (count >= 0xF)
 972                         break;
 973         }
 974
 975         if (count >= 0xF) {
 976                 if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT))
 977                         DBG("Too large timeout 0x%x requested for CMD%d!\n",
 978                             count, cmd->opcode);
 979                 count = 0xE;
 980         } else {
 981                 *too_big = false;
 982         }
 983
 984         return count;
 985 }
 986
 987 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 988 {
 989         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 990         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 991
 992         if (host->flags & SDHCI_REQ_USE_DMA)
 993                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
 994         else
 995                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
 996
 997         if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12))
 998                 host->ier |= SDHCI_INT_AUTO_CMD_ERR;
 999         else
1000                 host->ier &= ~SDHCI_INT_AUTO_CMD_ERR;
1001
1002         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1003         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1004 }
1005
1006 void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable)
1007 {
1008         if (enable)
1009                 host->ier |= SDHCI_INT_DATA_TIMEOUT;
1010         else
1011                 host->ier &= ~SDHCI_INT_DATA_TIMEOUT;
1012         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1013         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1014 }
1015 EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq);
1016
1017 void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1018 {
1019         bool too_big = false;
1020         u8 count = sdhci_calc_timeout(host, cmd, &too_big);
1021
1022         if (too_big &&
1023             host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
1024                 sdhci_calc_sw_timeout(host, cmd);
1025                 sdhci_set_data_timeout_irq(host, false);
1026         } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
1027                 sdhci_set_data_timeout_irq(host, true);
1028         }
1029
1030         sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
1031 }
1032 EXPORT_SYMBOL_GPL(__sdhci_set_timeout);
1033
1034 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1035 {
1036         if (host->ops->set_timeout)
1037                 host->ops->set_timeout(host, cmd);
1038         else
1039                 __sdhci_set_timeout(host, cmd);
1040 }
1041
1042 static void sdhci_initialize_data(struct sdhci_host *host,
1043                                   struct mmc_data *data)
1044 {
1045         WARN_ON(host->data);
1046
1047         /* Sanity checks */
1048         BUG_ON(data->blksz * data->blocks > 524288);
1049         BUG_ON(data->blksz > host->mmc->max_blk_size);
1050         BUG_ON(data->blocks > 65535);
1051
1052         host->data = data;
1053         host->data_early = 0;
1054         host->data->bytes_xfered = 0;
1055 }
1056
1057 static inline void sdhci_set_block_info(struct sdhci_host *host,
1058                                         struct mmc_data *data)
1059 {
1060         /* Set the DMA boundary value and block size */
1061         sdhci_writew(host,
1062                      SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
1063                      SDHCI_BLOCK_SIZE);
1064         /*
1065          * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count
1066          * can be supported, in that case 16-bit block count register must be 0.
1067          */
1068         if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
1069             (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) {
1070                 if (sdhci_readw(host, SDHCI_BLOCK_COUNT))
1071                         sdhci_writew(host, 0, SDHCI_BLOCK_COUNT);
1072                 sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT);
1073         } else {
1074                 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
1075         }
1076 }
1077
1078 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
1079 {
1080         struct mmc_data *data = cmd->data;
1081
1082         sdhci_initialize_data(host, data);
1083
1084         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
1085                 struct scatterlist *sg;
1086                 unsigned int length_mask, offset_mask;
1087                 int i;
1088
1089                 host->flags |= SDHCI_REQ_USE_DMA;
1090
1091                 /*
1092                  * FIXME: This doesn't account for merging when mapping the
1093                  * scatterlist.
1094                  *
1095                  * The assumption here being that alignment and lengths are
1096                  * the same after DMA mapping to device address space.
1097                  */
1098                 length_mask = 0;
1099                 offset_mask = 0;
1100                 if (host->flags & SDHCI_USE_ADMA) {
1101                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
1102                                 length_mask = 3;
1103                                 /*
1104                                  * As we use up to 3 byte chunks to work
1105                                  * around alignment problems, we need to
1106                                  * check the offset as well.
1107                                  */
1108                                 offset_mask = 3;
1109                         }
1110                 } else {
1111                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
1112                                 length_mask = 3;
1113                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
1114                                 offset_mask = 3;
1115                 }
1116
1117                 if (unlikely(length_mask | offset_mask)) {
1118                         for_each_sg(data->sg, sg, data->sg_len, i) {
1119                                 if (sg->length & length_mask) {
1120                                         DBG("Reverting to PIO because of transfer size (%d)\n",
1121                                             sg->length);
1122                                         host->flags &= ~SDHCI_REQ_USE_DMA;
1123                                         break;
1124                                 }
1125                                 if (sg->offset & offset_mask) {
1126                                         DBG("Reverting to PIO because of bad alignment\n");
1127                                         host->flags &= ~SDHCI_REQ_USE_DMA;
1128                                         break;
1129                                 }
1130                         }
1131                 }
1132         }
1133
1134         if (host->flags & SDHCI_REQ_USE_DMA) {
1135                 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1136
1137                 if (sg_cnt <= 0) {
1138                         /*
1139                          * This only happens when someone fed
1140                          * us an invalid request.
1141                          */
1142                         WARN_ON(1);
1143                         host->flags &= ~SDHCI_REQ_USE_DMA;
1144                 } else if (host->flags & SDHCI_USE_ADMA) {
1145                         sdhci_adma_table_pre(host, data, sg_cnt);
1146                         sdhci_set_adma_addr(host, host->adma_addr);
1147                 } else {
1148                         WARN_ON(sg_cnt != 1);
1149                         sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
1150                 }
1151         }
1152
1153         sdhci_config_dma(host);
1154
1155         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
1156                 int flags;
1157
1158                 flags = SG_MITER_ATOMIC;
1159                 if (host->data->flags & MMC_DATA_READ)
1160                         flags |= SG_MITER_TO_SG;
1161                 else
1162                         flags |= SG_MITER_FROM_SG;
1163                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1164                 host->blocks = data->blocks;
1165         }
1166
1167         sdhci_set_transfer_irqs(host);
1168
1169         sdhci_set_block_info(host, data);
1170 }
1171
1172 #if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
1173
1174 static int sdhci_external_dma_init(struct sdhci_host *host)
1175 {
1176         int ret = 0;
1177         struct mmc_host *mmc = host->mmc;
1178
1179         host->tx_chan = dma_request_chan(mmc_dev(mmc), "tx");
1180         if (IS_ERR(host->tx_chan)) {
1181                 ret = PTR_ERR(host->tx_chan);
1182                 if (ret != -EPROBE_DEFER)
1183                         pr_warn("Failed to request TX DMA channel.\n");
1184                 host->tx_chan = NULL;
1185                 return ret;
1186         }
1187
1188         host->rx_chan = dma_request_chan(mmc_dev(mmc), "rx");
1189         if (IS_ERR(host->rx_chan)) {
1190                 if (host->tx_chan) {
1191                         dma_release_channel(host->tx_chan);
1192                         host->tx_chan = NULL;
1193                 }
1194
1195                 ret = PTR_ERR(host->rx_chan);
1196                 if (ret != -EPROBE_DEFER)
1197                         pr_warn("Failed to request RX DMA channel.\n");
1198                 host->rx_chan = NULL;
1199         }
1200
1201         return ret;
1202 }
1203
1204 static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1205                                                    struct mmc_data *data)
1206 {
1207         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
1208 }
1209
1210 static int sdhci_external_dma_setup(struct sdhci_host *host,
1211                                     struct mmc_command *cmd)
1212 {
1213         int ret, i;
1214         enum dma_transfer_direction dir;
1215         struct dma_async_tx_descriptor *desc;
1216         struct mmc_data *data = cmd->data;
1217         struct dma_chan *chan;
1218         struct dma_slave_config cfg;
1219         dma_cookie_t cookie;
1220         int sg_cnt;
1221
1222         if (!host->mapbase)
1223                 return -EINVAL;
1224
1225         cfg.src_addr = host->mapbase + SDHCI_BUFFER;
1226         cfg.dst_addr = host->mapbase + SDHCI_BUFFER;
1227         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1228         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1229         cfg.src_maxburst = data->blksz / 4;
1230         cfg.dst_maxburst = data->blksz / 4;
1231
1232         /* Sanity check: all the SG entries must be aligned by block size. */
1233         for (i = 0; i < data->sg_len; i++) {
1234                 if ((data->sg + i)->length % data->blksz)
1235                         return -EINVAL;
1236         }
1237
1238         chan = sdhci_external_dma_channel(host, data);
1239
1240         ret = dmaengine_slave_config(chan, &cfg);
1241         if (ret)
1242                 return ret;
1243
1244         sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1245         if (sg_cnt <= 0)
1246                 return -EINVAL;
1247
1248         dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
1249         desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir,
1250                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1251         if (!desc)
1252                 return -EINVAL;
1253
1254         desc->callback = NULL;
1255         desc->callback_param = NULL;
1256
1257         cookie = dmaengine_submit(desc);
1258         if (dma_submit_error(cookie))
1259                 ret = cookie;
1260
1261         return ret;
1262 }
1263
1264 static void sdhci_external_dma_release(struct sdhci_host *host)
1265 {
1266         if (host->tx_chan) {
1267                 dma_release_channel(host->tx_chan);
1268                 host->tx_chan = NULL;
1269         }
1270
1271         if (host->rx_chan) {
1272                 dma_release_channel(host->rx_chan);
1273                 host->rx_chan = NULL;
1274         }
1275
1276         sdhci_switch_external_dma(host, false);
1277 }
1278
1279 static void __sdhci_external_dma_prepare_data(struct sdhci_host *host,
1280                                               struct mmc_command *cmd)
1281 {
1282         struct mmc_data *data = cmd->data;
1283
1284         sdhci_initialize_data(host, data);
1285
1286         host->flags |= SDHCI_REQ_USE_DMA;
1287         sdhci_set_transfer_irqs(host);
1288
1289         sdhci_set_block_info(host, data);
1290 }
1291
1292 static void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1293                                             struct mmc_command *cmd)
1294 {
1295         if (!sdhci_external_dma_setup(host, cmd)) {
1296                 __sdhci_external_dma_prepare_data(host, cmd);
1297         } else {
1298                 sdhci_external_dma_release(host);
1299                 pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n",
1300                        mmc_hostname(host->mmc));
1301                 sdhci_prepare_data(host, cmd);
1302         }
1303 }
1304
1305 static void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1306                                             struct mmc_command *cmd)
1307 {
1308         struct dma_chan *chan;
1309
1310         if (!cmd->data)
1311                 return;
1312
1313         chan = sdhci_external_dma_channel(host, cmd->data);
1314         if (chan)
1315                 dma_async_issue_pending(chan);
1316 }
1317
1318 #else
1319
1320 static inline int sdhci_external_dma_init(struct sdhci_host *host)
1321 {
1322         return -EOPNOTSUPP;
1323 }
1324
1325 static inline void sdhci_external_dma_release(struct sdhci_host *host)
1326 {
1327 }
1328
1329 static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1330                                                    struct mmc_command *cmd)
1331 {
1332         /* This should never happen */
1333         WARN_ON_ONCE(1);
1334 }
1335
1336 static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1337                                                    struct mmc_command *cmd)
1338 {
1339 }
1340
1341 static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1342                                                           struct mmc_data *data)
1343 {
1344         return NULL;
1345 }
1346
1347 #endif
1348
1349 void sdhci_switch_external_dma(struct sdhci_host *host, bool en)
1350 {
1351         host->use_external_dma = en;
1352 }
1353 EXPORT_SYMBOL_GPL(sdhci_switch_external_dma);
1354
1355 static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
1356                                     struct mmc_request *mrq)
1357 {
1358         return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
1359                !mrq->cap_cmd_during_tfr;
1360 }
1361
1362 static inline bool sdhci_auto_cmd23(struct sdhci_host *host,
1363                                     struct mmc_request *mrq)
1364 {
1365         return mrq->sbc && (host->flags & SDHCI_AUTO_CMD23);
1366 }
1367
1368 static inline bool sdhci_manual_cmd23(struct sdhci_host *host,
1369                                       struct mmc_request *mrq)
1370 {
1371         return mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23);
1372 }
1373
1374 static inline void sdhci_auto_cmd_select(struct sdhci_host *host,
1375                                          struct mmc_command *cmd,
1376                                          u16 *mode)
1377 {
1378         bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) &&
1379                          (cmd->opcode != SD_IO_RW_EXTENDED);
1380         bool use_cmd23 = sdhci_auto_cmd23(host, cmd->mrq);
1381         u16 ctrl2;
1382
1383         /*
1384          * In case of Version 4.10 or later, use of 'Auto CMD Auto
1385          * Select' is recommended rather than use of 'Auto CMD12
1386          * Enable' or 'Auto CMD23 Enable'. We require Version 4 Mode
1387          * here because some controllers (e.g sdhci-of-dwmshc) expect it.
1388          */
1389         if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
1390             (use_cmd12 || use_cmd23)) {
1391                 *mode |= SDHCI_TRNS_AUTO_SEL;
1392
1393                 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1394                 if (use_cmd23)
1395                         ctrl2 |= SDHCI_CMD23_ENABLE;
1396                 else
1397                         ctrl2 &= ~SDHCI_CMD23_ENABLE;
1398                 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
1399
1400                 return;
1401         }
1402
1403         /*
1404          * If we are sending CMD23, CMD12 never gets sent
1405          * on successful completion (so no Auto-CMD12).
1406          */
1407         if (use_cmd12)
1408                 *mode |= SDHCI_TRNS_AUTO_CMD12;
1409         else if (use_cmd23)
1410                 *mode |= SDHCI_TRNS_AUTO_CMD23;
1411 }
1412
1413 static void sdhci_set_transfer_mode(struct sdhci_host *host,
1414         struct mmc_command *cmd)
1415 {
1416         u16 mode = 0;
1417         struct mmc_data *data = cmd->data;
1418
1419         if (data == NULL) {
1420                 if (host->quirks2 &
1421                         SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
1422                         /* must not clear SDHCI_TRANSFER_MODE when tuning */
1423                         if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
1424                                 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
1425                 } else {
1426                 /* clear Auto CMD settings for no data CMDs */
1427                         mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
1428                         sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
1429                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
1430                 }
1431                 return;
1432         }
1433
1434         WARN_ON(!host->data);
1435
1436         if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
1437                 mode = SDHCI_TRNS_BLK_CNT_EN;
1438
1439         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
1440                 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
1441                 sdhci_auto_cmd_select(host, cmd, &mode);
1442                 if (sdhci_auto_cmd23(host, cmd->mrq))
1443                         sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
1444         }
1445
1446         if (data->flags & MMC_DATA_READ)
1447                 mode |= SDHCI_TRNS_READ;
1448         if (host->flags & SDHCI_REQ_USE_DMA)
1449                 mode |= SDHCI_TRNS_DMA;
1450
1451         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
1452 }
1453
1454 static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
1455 {
1456         return (!(host->flags & SDHCI_DEVICE_DEAD) &&
1457                 ((mrq->cmd && mrq->cmd->error) ||
1458                  (mrq->sbc && mrq->sbc->error) ||
1459                  (mrq->data && mrq->data->stop && mrq->data->stop->error) ||
1460                  (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
1461 }
1462
1463 static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq)
1464 {
1465         int i;
1466
1467         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1468                 if (host->mrqs_done[i] == mrq) {
1469                         WARN_ON(1);
1470                         return;
1471                 }
1472         }
1473
1474         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1475                 if (!host->mrqs_done[i]) {
1476                         host->mrqs_done[i] = mrq;
1477                         break;
1478                 }
1479         }
1480
1481         WARN_ON(i >= SDHCI_MAX_MRQS);
1482 }
1483
1484 static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1485 {
1486         if (host->cmd && host->cmd->mrq == mrq)
1487                 host->cmd = NULL;
1488
1489         if (host->data_cmd && host->data_cmd->mrq == mrq)
1490                 host->data_cmd = NULL;
1491
1492         if (host->deferred_cmd && host->deferred_cmd->mrq == mrq)
1493                 host->deferred_cmd = NULL;
1494
1495         if (host->data && host->data->mrq == mrq)
1496                 host->data = NULL;
1497
1498         if (sdhci_needs_reset(host, mrq))
1499                 host->pending_reset = true;
1500
1501         sdhci_set_mrq_done(host, mrq);
1502
1503         sdhci_del_timer(host, mrq);
1504
1505         if (!sdhci_has_requests(host))
1506                 sdhci_led_deactivate(host);
1507 }
1508
1509 static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1510 {
1511         __sdhci_finish_mrq(host, mrq);
1512
1513         queue_work(host->complete_wq, &host->complete_work);
1514 }
1515
1516 static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
1517 {
1518         struct mmc_command *data_cmd = host->data_cmd;
1519         struct mmc_data *data = host->data;
1520
1521         host->data = NULL;
1522         host->data_cmd = NULL;
1523
1524         /*
1525          * The controller needs a reset of internal state machines upon error
1526          * conditions.
1527          */
1528         if (data->error) {
1529                 if (!host->cmd || host->cmd == data_cmd)
1530                         sdhci_do_reset(host, SDHCI_RESET_CMD);
1531                 sdhci_do_reset(host, SDHCI_RESET_DATA);
1532         }
1533
1534         if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1535             (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1536                 sdhci_adma_table_post(host, data);
1537
1538         /*
1539          * The specification states that the block count register must
1540          * be updated, but it does not specify at what point in the
1541          * data flow. That makes the register entirely useless to read
1542          * back so we have to assume that nothing made it to the card
1543          * in the event of an error.
1544          */
1545         if (data->error)
1546                 data->bytes_xfered = 0;
1547         else
1548                 data->bytes_xfered = data->blksz * data->blocks;
1549
1550         /*
1551          * Need to send CMD12 if -
1552          * a) open-ended multiblock transfer not using auto CMD12 (no CMD23)
1553          * b) error in multiblock transfer
1554          */
1555         if (data->stop &&
1556             ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) ||
1557              data->error)) {
1558                 /*
1559                  * 'cap_cmd_during_tfr' request must not use the command line
1560                  * after mmc_command_done() has been called. It is upper layer's
1561                  * responsibility to send the stop command if required.
1562                  */
1563                 if (data->mrq->cap_cmd_during_tfr) {
1564                         __sdhci_finish_mrq(host, data->mrq);
1565                 } else {
1566                         /* Avoid triggering warning in sdhci_send_command() */
1567                         host->cmd = NULL;
1568                         if (!sdhci_send_command(host, data->stop)) {
1569                                 if (sw_data_timeout) {
1570                                         /*
1571                                          * This is anyway a sw data timeout, so
1572                                          * give up now.
1573                                          */
1574                                         data->stop->error = -EIO;
1575                                         __sdhci_finish_mrq(host, data->mrq);
1576                                 } else {
1577                                         WARN_ON(host->deferred_cmd);
1578                                         host->deferred_cmd = data->stop;
1579                                 }
1580                         }
1581                 }
1582         } else {
1583                 __sdhci_finish_mrq(host, data->mrq);
1584         }
1585 }
1586
1587 static void sdhci_finish_data(struct sdhci_host *host)
1588 {
1589         __sdhci_finish_data(host, false);
1590 }
1591
1592 static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1593 {
1594         int flags;
1595         u32 mask;
1596         unsigned long timeout;
1597
1598         WARN_ON(host->cmd);
1599
1600         /* Initially, a command has no error */
1601         cmd->error = 0;
1602
1603         if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1604             cmd->opcode == MMC_STOP_TRANSMISSION)
1605                 cmd->flags |= MMC_RSP_BUSY;
1606
1607         mask = SDHCI_CMD_INHIBIT;
1608         if (sdhci_data_line_cmd(cmd))
1609                 mask |= SDHCI_DATA_INHIBIT;
1610
1611         /* We shouldn't wait for data inihibit for stop commands, even
1612            though they might use busy signaling */
1613         if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1614                 mask &= ~SDHCI_DATA_INHIBIT;
1615
1616         if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask)
1617                 return false;
1618
1619         host->cmd = cmd;
1620         host->data_timeout = 0;
1621         if (sdhci_data_line_cmd(cmd)) {
1622                 WARN_ON(host->data_cmd);
1623                 host->data_cmd = cmd;
1624                 sdhci_set_timeout(host, cmd);
1625         }
1626
1627         if (cmd->data) {
1628                 if (host->use_external_dma)
1629                         sdhci_external_dma_prepare_data(host, cmd);
1630                 else
1631                         sdhci_prepare_data(host, cmd);
1632         }
1633
1634         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1635
1636         sdhci_set_transfer_mode(host, cmd);
1637
1638         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1639                 WARN_ONCE(1, "Unsupported response type!\n");
1640                 /*
1641                  * This does not happen in practice because 136-bit response
1642                  * commands never have busy waiting, so rather than complicate
1643                  * the error path, just remove busy waiting and continue.
1644                  */
1645                 cmd->flags &= ~MMC_RSP_BUSY;
1646         }
1647
1648         if (!(cmd->flags & MMC_RSP_PRESENT))
1649                 flags = SDHCI_CMD_RESP_NONE;
1650         else if (cmd->flags & MMC_RSP_136)
1651                 flags = SDHCI_CMD_RESP_LONG;
1652         else if (cmd->flags & MMC_RSP_BUSY)
1653                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1654         else
1655                 flags = SDHCI_CMD_RESP_SHORT;
1656
1657         if (cmd->flags & MMC_RSP_CRC)
1658                 flags |= SDHCI_CMD_CRC;
1659         if (cmd->flags & MMC_RSP_OPCODE)
1660                 flags |= SDHCI_CMD_INDEX;
1661
1662         /* CMD19 is special in that the Data Present Select should be set */
1663         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1664             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1665                 flags |= SDHCI_CMD_DATA;
1666
1667         timeout = jiffies;
1668         if (host->data_timeout)
1669                 timeout += nsecs_to_jiffies(host->data_timeout);
1670         else if (!cmd->data && cmd->busy_timeout > 9000)
1671                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1672         else
1673                 timeout += 10 * HZ;
1674         sdhci_mod_timer(host, cmd->mrq, timeout);
1675
1676         if (host->use_external_dma)
1677                 sdhci_external_dma_pre_transfer(host, cmd);
1678
1679         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1680
1681         return true;
1682 }
1683
1684 static bool sdhci_present_error(struct sdhci_host *host,
1685                                 struct mmc_command *cmd, bool present)
1686 {
1687         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1688                 cmd->error = -ENOMEDIUM;
1689                 return true;
1690         }
1691
1692         return false;
1693 }
1694
1695 static bool sdhci_send_command_retry(struct sdhci_host *host,
1696                                      struct mmc_command *cmd,
1697                                      unsigned long flags)
1698         __releases(host->lock)
1699         __acquires(host->lock)
1700 {
1701         struct mmc_command *deferred_cmd = host->deferred_cmd;
1702         int timeout = 10; /* Approx. 10 ms */
1703         bool present;
1704
1705         while (!sdhci_send_command(host, cmd)) {
1706                 if (!timeout--) {
1707                         pr_err("%s: Controller never released inhibit bit(s).\n",
1708                                mmc_hostname(host->mmc));
1709                         sdhci_dumpregs(host);
1710                         cmd->error = -EIO;
1711                         return false;
1712                 }
1713
1714                 spin_unlock_irqrestore(&host->lock, flags);
1715
1716                 usleep_range(1000, 1250);
1717
1718                 present = host->mmc->ops->get_cd(host->mmc);
1719
1720                 spin_lock_irqsave(&host->lock, flags);
1721
1722                 /* A deferred command might disappear, handle that */
1723                 if (cmd == deferred_cmd && cmd != host->deferred_cmd)
1724                         return true;
1725
1726                 if (sdhci_present_error(host, cmd, present))
1727                         return false;
1728         }
1729
1730         if (cmd == host->deferred_cmd)
1731                 host->deferred_cmd = NULL;
1732
1733         return true;
1734 }
1735
1736 static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
1737 {
1738         int i, reg;
1739
1740         for (i = 0; i < 4; i++) {
1741                 reg = SDHCI_RESPONSE + (3 - i) * 4;
1742                 cmd->resp[i] = sdhci_readl(host, reg);
1743         }
1744
1745         if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
1746                 return;
1747
1748         /* CRC is stripped so we need to do some shifting */
1749         for (i = 0; i < 4; i++) {
1750                 cmd->resp[i] <<= 8;
1751                 if (i != 3)
1752                         cmd->resp[i] |= cmd->resp[i + 1] >> 24;
1753         }
1754 }
1755
1756 static void sdhci_finish_command(struct sdhci_host *host)
1757 {
1758         struct mmc_command *cmd = host->cmd;
1759
1760         host->cmd = NULL;
1761
1762         if (cmd->flags & MMC_RSP_PRESENT) {
1763                 if (cmd->flags & MMC_RSP_136) {
1764                         sdhci_read_rsp_136(host, cmd);
1765                 } else {
1766                         cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1767                 }
1768         }
1769
1770         if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1771                 mmc_command_done(host->mmc, cmd->mrq);
1772
1773         /*
1774          * The host can send and interrupt when the busy state has
1775          * ended, allowing us to wait without wasting CPU cycles.
1776          * The busy signal uses DAT0 so this is similar to waiting
1777          * for data to complete.
1778          *
1779          * Note: The 1.0 specification is a bit ambiguous about this
1780          *       feature so there might be some problems with older
1781          *       controllers.
1782          */
1783         if (cmd->flags & MMC_RSP_BUSY) {
1784                 if (cmd->data) {
1785                         DBG("Cannot wait for busy signal when also doing a data transfer");
1786                 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1787                            cmd == host->data_cmd) {
1788                         /* Command complete before busy is ended */
1789                         return;
1790                 }
1791         }
1792
1793         /* Finished CMD23, now send actual command. */
1794         if (cmd == cmd->mrq->sbc) {
1795                 if (!sdhci_send_command(host, cmd->mrq->cmd)) {
1796                         WARN_ON(host->deferred_cmd);
1797                         host->deferred_cmd = cmd->mrq->cmd;
1798                 }
1799         } else {
1800
1801                 /* Processed actual command. */
1802                 if (host->data && host->data_early)
1803                         sdhci_finish_data(host);
1804
1805                 if (!cmd->data)
1806                         __sdhci_finish_mrq(host, cmd->mrq);
1807         }
1808 }
1809
1810 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1811 {
1812         u16 preset = 0;
1813
1814         switch (host->timing) {
1815         case MMC_TIMING_MMC_HS:
1816         case MMC_TIMING_SD_HS:
1817                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HIGH_SPEED);
1818                 break;
1819         case MMC_TIMING_UHS_SDR12:
1820                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1821                 break;
1822         case MMC_TIMING_UHS_SDR25:
1823                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1824                 break;
1825         case MMC_TIMING_UHS_SDR50:
1826                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1827                 break;
1828         case MMC_TIMING_UHS_SDR104:
1829         case MMC_TIMING_MMC_HS200:
1830                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1831                 break;
1832         case MMC_TIMING_UHS_DDR50:
1833         case MMC_TIMING_MMC_DDR52:
1834                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1835                 break;
1836         case MMC_TIMING_MMC_HS400:
1837                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1838                 break;
1839         default:
1840                 pr_warn("%s: Invalid UHS-I mode selected\n",
1841                         mmc_hostname(host->mmc));
1842                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1843                 break;
1844         }
1845         return preset;
1846 }
1847
1848 u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1849                    unsigned int *actual_clock)
1850 {
1851         int div = 0; /* Initialized for compiler warning */
1852         int real_div = div, clk_mul = 1;
1853         u16 clk = 0;
1854         bool switch_base_clk = false;
1855
1856         if (host->version >= SDHCI_SPEC_300) {
1857                 if (host->preset_enabled) {
1858                         u16 pre_val;
1859
1860                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1861                         pre_val = sdhci_get_preset_value(host);
1862                         div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val);
1863                         if (host->clk_mul &&
1864                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL)) {
1865                                 clk = SDHCI_PROG_CLOCK_MODE;
1866                                 real_div = div + 1;
1867                                 clk_mul = host->clk_mul;
1868                         } else {
1869                                 real_div = max_t(int, 1, div << 1);
1870                         }
1871                         goto clock_set;
1872                 }
1873
1874                 /*
1875                  * Check if the Host Controller supports Programmable Clock
1876                  * Mode.
1877                  */
1878                 if (host->clk_mul) {
1879                         for (div = 1; div <= 1024; div++) {
1880                                 if ((host->max_clk * host->clk_mul / div)
1881                                         <= clock)
1882                                         break;
1883                         }
1884                         if ((host->max_clk * host->clk_mul / div) <= clock) {
1885                                 /*
1886                                  * Set Programmable Clock Mode in the Clock
1887                                  * Control register.
1888                                  */
1889                                 clk = SDHCI_PROG_CLOCK_MODE;
1890                                 real_div = div;
1891                                 clk_mul = host->clk_mul;
1892                                 div--;
1893                         } else {
1894                                 /*
1895                                  * Divisor can be too small to reach clock
1896                                  * speed requirement. Then use the base clock.
1897                                  */
1898                                 switch_base_clk = true;
1899                         }
1900                 }
1901
1902                 if (!host->clk_mul || switch_base_clk) {
1903                         /* Version 3.00 divisors must be a multiple of 2. */
1904                         if (host->max_clk <= clock)
1905                                 div = 1;
1906                         else {
1907                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1908                                      div += 2) {
1909                                         if ((host->max_clk / div) <= clock)
1910                                                 break;
1911                                 }
1912                         }
1913                         real_div = div;
1914                         div >>= 1;
1915                         if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1916                                 && !div && host->max_clk <= 25000000)
1917                                 div = 1;
1918                 }
1919         } else {
1920                 /* Version 2.00 divisors must be a power of 2. */
1921                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1922                         if ((host->max_clk / div) <= clock)
1923                                 break;
1924                 }
1925                 real_div = div;
1926                 div >>= 1;
1927         }
1928
1929 clock_set:
1930         if (real_div)
1931                 *actual_clock = (host->max_clk * clk_mul) / real_div;
1932         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1933         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1934                 << SDHCI_DIVIDER_HI_SHIFT;
1935
1936         return clk;
1937 }
1938 EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1939
1940 void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1941 {
1942         ktime_t timeout;
1943
1944         clk |= SDHCI_CLOCK_INT_EN;
1945         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1946
1947         /* Wait max 150 ms */
1948         timeout = ktime_add_ms(ktime_get(), 150);
1949         while (1) {
1950                 bool timedout = ktime_after(ktime_get(), timeout);
1951
1952                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1953                 if (clk & SDHCI_CLOCK_INT_STABLE)
1954                         break;
1955                 if (timedout) {
1956                         pr_err("%s: Internal clock never stabilised.\n",
1957                                mmc_hostname(host->mmc));
1958                         sdhci_dumpregs(host);
1959                         return;
1960                 }
1961                 udelay(10);
1962         }
1963
1964         if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
1965                 clk |= SDHCI_CLOCK_PLL_EN;
1966                 clk &= ~SDHCI_CLOCK_INT_STABLE;
1967                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1968
1969                 /* Wait max 150 ms */
1970                 timeout = ktime_add_ms(ktime_get(), 150);
1971                 while (1) {
1972                         bool timedout = ktime_after(ktime_get(), timeout);
1973
1974                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1975                         if (clk & SDHCI_CLOCK_INT_STABLE)
1976                                 break;
1977                         if (timedout) {
1978                                 pr_err("%s: PLL clock never stabilised.\n",
1979                                        mmc_hostname(host->mmc));
1980                                 sdhci_dumpregs(host);
1981                                 return;
1982                         }
1983                         udelay(10);
1984                 }
1985         }
1986
1987         clk |= SDHCI_CLOCK_CARD_EN;
1988         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1989 }
1990 EXPORT_SYMBOL_GPL(sdhci_enable_clk);
1991
1992 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1993 {
1994         u16 clk;
1995
1996         host->mmc->actual_clock = 0;
1997
1998         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1999
2000         if (clock == 0)
2001                 return;
2002
2003         clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
2004         sdhci_enable_clk(host, clk);
2005 }
2006 EXPORT_SYMBOL_GPL(sdhci_set_clock);
2007
2008 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
2009                                 unsigned short vdd)
2010 {
2011         struct mmc_host *mmc = host->mmc;
2012
2013         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
2014
2015         if (mode != MMC_POWER_OFF)
2016                 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
2017         else
2018                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2019 }
2020
2021 void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
2022                            unsigned short vdd)
2023 {
2024         u8 pwr = 0;
2025
2026         if (mode != MMC_POWER_OFF) {
2027                 switch (1 << vdd) {
2028                 case MMC_VDD_165_195:
2029                 /*
2030                  * Without a regulator, SDHCI does not support 2.0v
2031                  * so we only get here if the driver deliberately
2032                  * added the 2.0v range to ocr_avail. Map it to 1.8v
2033                  * for the purpose of turning on the power.
2034                  */
2035                 case MMC_VDD_20_21:
2036                         pwr = SDHCI_POWER_180;
2037                         break;
2038                 case MMC_VDD_29_30:
2039                 case MMC_VDD_30_31:
2040                         pwr = SDHCI_POWER_300;
2041                         break;
2042                 case MMC_VDD_32_33:
2043                 case MMC_VDD_33_34:
2044                         pwr = SDHCI_POWER_330;
2045                         break;
2046                 default:
2047                         WARN(1, "%s: Invalid vdd %#x\n",
2048                              mmc_hostname(host->mmc), vdd);
2049                         break;
2050                 }
2051         }
2052
2053         if (host->pwr == pwr)
2054                 return;
2055
2056         host->pwr = pwr;
2057
2058         if (pwr == 0) {
2059                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2060                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
2061                         sdhci_runtime_pm_bus_off(host);
2062         } else {
2063                 /*
2064                  * Spec says that we should clear the power reg before setting
2065                  * a new value. Some controllers don't seem to like this though.
2066                  */
2067                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
2068                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2069
2070                 /*
2071                  * At least the Marvell CaFe chip gets confused if we set the
2072                  * voltage and set turn on power at the same time, so set the
2073                  * voltage first.
2074                  */
2075                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
2076                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
2077
2078                 pwr |= SDHCI_POWER_ON;
2079
2080                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
2081
2082                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
2083                         sdhci_runtime_pm_bus_on(host);
2084
2085                 /*
2086                  * Some controllers need an extra 10ms delay of 10ms before
2087                  * they can apply clock after applying power
2088                  */
2089                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
2090                         mdelay(10);
2091         }
2092 }
2093 EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
2094
2095 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
2096                      unsigned short vdd)
2097 {
2098         if (IS_ERR(host->mmc->supply.vmmc))
2099                 sdhci_set_power_noreg(host, mode, vdd);
2100         else
2101                 sdhci_set_power_reg(host, mode, vdd);
2102 }
2103 EXPORT_SYMBOL_GPL(sdhci_set_power);
2104
2105 /*
2106  * Some controllers need to configure a valid bus voltage on their power
2107  * register regardless of whether an external regulator is taking care of power
2108  * supply. This helper function takes care of it if set as the controller's
2109  * sdhci_ops.set_power callback.
2110  */
2111 void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
2112                                      unsigned char mode,
2113                                      unsigned short vdd)
2114 {
2115         if (!IS_ERR(host->mmc->supply.vmmc)) {
2116                 struct mmc_host *mmc = host->mmc;
2117
2118                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
2119         }
2120         sdhci_set_power_noreg(host, mode, vdd);
2121 }
2122 EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage);
2123
2124 /*****************************************************************************\
2125  *                                                                           *
2126  * MMC callbacks                                                             *
2127  *                                                                           *
2128 \*****************************************************************************/
2129
2130 void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
2131 {
2132         struct sdhci_host *host = mmc_priv(mmc);
2133         struct mmc_command *cmd;
2134         unsigned long flags;
2135         bool present;
2136
2137         /* Firstly check card presence */
2138         present = mmc->ops->get_cd(mmc);
2139
2140         spin_lock_irqsave(&host->lock, flags);
2141
2142         sdhci_led_activate(host);
2143
2144         if (sdhci_present_error(host, mrq->cmd, present))
2145                 goto out_finish;
2146
2147         cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
2148
2149         if (!sdhci_send_command_retry(host, cmd, flags))
2150                 goto out_finish;
2151
2152         spin_unlock_irqrestore(&host->lock, flags);
2153
2154         return;
2155
2156 out_finish:
2157         sdhci_finish_mrq(host, mrq);
2158         spin_unlock_irqrestore(&host->lock, flags);
2159 }
2160 EXPORT_SYMBOL_GPL(sdhci_request);
2161
2162 int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq)
2163 {
2164         struct sdhci_host *host = mmc_priv(mmc);
2165         struct mmc_command *cmd;
2166         unsigned long flags;
2167         int ret = 0;
2168
2169         spin_lock_irqsave(&host->lock, flags);
2170
2171         if (sdhci_present_error(host, mrq->cmd, true)) {
2172                 sdhci_finish_mrq(host, mrq);
2173                 goto out_finish;
2174         }
2175
2176         cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
2177
2178         /*
2179          * The HSQ may send a command in interrupt context without polling
2180          * the busy signaling, which means we should return BUSY if controller
2181          * has not released inhibit bits to allow HSQ trying to send request
2182          * again in non-atomic context. So we should not finish this request
2183          * here.
2184          */
2185         if (!sdhci_send_command(host, cmd))
2186                 ret = -EBUSY;
2187         else
2188                 sdhci_led_activate(host);
2189
2190 out_finish:
2191         spin_unlock_irqrestore(&host->lock, flags);
2192         return ret;
2193 }
2194 EXPORT_SYMBOL_GPL(sdhci_request_atomic);
2195
2196 void sdhci_set_bus_width(struct sdhci_host *host, int width)
2197 {
2198         u8 ctrl;
2199
2200         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2201         if (width == MMC_BUS_WIDTH_8) {
2202                 ctrl &= ~SDHCI_CTRL_4BITBUS;
2203                 ctrl |= SDHCI_CTRL_8BITBUS;
2204         } else {
2205                 if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
2206                         ctrl &= ~SDHCI_CTRL_8BITBUS;
2207                 if (width == MMC_BUS_WIDTH_4)
2208                         ctrl |= SDHCI_CTRL_4BITBUS;
2209                 else
2210                         ctrl &= ~SDHCI_CTRL_4BITBUS;
2211         }
2212         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2213 }
2214 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
2215
2216 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
2217 {
2218         u16 ctrl_2;
2219
2220         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2221         /* Select Bus Speed Mode for host */
2222         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
2223         if ((timing == MMC_TIMING_MMC_HS200) ||
2224             (timing == MMC_TIMING_UHS_SDR104))
2225                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
2226         else if (timing == MMC_TIMING_UHS_SDR12)
2227                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
2228         else if (timing == MMC_TIMING_UHS_SDR25)
2229                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
2230         else if (timing == MMC_TIMING_UHS_SDR50)
2231                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
2232         else if ((timing == MMC_TIMING_UHS_DDR50) ||
2233                  (timing == MMC_TIMING_MMC_DDR52))
2234                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
2235         else if (timing == MMC_TIMING_MMC_HS400)
2236                 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
2237         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2238 }
2239 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
2240
2241 void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
2242 {
2243         struct sdhci_host *host = mmc_priv(mmc);
2244         u8 ctrl;
2245
2246         if (ios->power_mode == MMC_POWER_UNDEFINED)
2247                 return;
2248
2249         if (host->flags & SDHCI_DEVICE_DEAD) {
2250                 if (!IS_ERR(mmc->supply.vmmc) &&
2251                     ios->power_mode == MMC_POWER_OFF)
2252                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
2253                 return;
2254         }
2255
2256         /*
2257          * Reset the chip on each power off.
2258          * Should clear out any weird states.
2259          */
2260         if (ios->power_mode == MMC_POWER_OFF) {
2261                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2262                 sdhci_reinit(host);
2263         }
2264
2265         if (host->version >= SDHCI_SPEC_300 &&
2266                 (ios->power_mode == MMC_POWER_UP) &&
2267                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
2268                 sdhci_enable_preset_value(host, false);
2269
2270         if (!ios->clock || ios->clock != host->clock) {
2271                 host->ops->set_clock(host, ios->clock);
2272                 host->clock = ios->clock;
2273
2274                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
2275                     host->clock) {
2276                         host->timeout_clk = mmc->actual_clock ?
2277                                                 mmc->actual_clock / 1000 :
2278                                                 host->clock / 1000;
2279                         mmc->max_busy_timeout =
2280                                 host->ops->get_max_timeout_count ?
2281                                 host->ops->get_max_timeout_count(host) :
2282                                 1 << 27;
2283                         mmc->max_busy_timeout /= host->timeout_clk;
2284                 }
2285         }
2286
2287         if (host->ops->set_power)
2288                 host->ops->set_power(host, ios->power_mode, ios->vdd);
2289         else
2290                 sdhci_set_power(host, ios->power_mode, ios->vdd);
2291
2292         if (host->ops->platform_send_init_74_clocks)
2293                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
2294
2295         host->ops->set_bus_width(host, ios->bus_width);
2296
2297         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2298
2299         if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
2300                 if (ios->timing == MMC_TIMING_SD_HS ||
2301                      ios->timing == MMC_TIMING_MMC_HS ||
2302                      ios->timing == MMC_TIMING_MMC_HS400 ||
2303                      ios->timing == MMC_TIMING_MMC_HS200 ||
2304                      ios->timing == MMC_TIMING_MMC_DDR52 ||
2305                      ios->timing == MMC_TIMING_UHS_SDR50 ||
2306                      ios->timing == MMC_TIMING_UHS_SDR104 ||
2307                      ios->timing == MMC_TIMING_UHS_DDR50 ||
2308                      ios->timing == MMC_TIMING_UHS_SDR25)
2309                         ctrl |= SDHCI_CTRL_HISPD;
2310                 else
2311                         ctrl &= ~SDHCI_CTRL_HISPD;
2312         }
2313
2314         if (host->version >= SDHCI_SPEC_300) {
2315                 u16 clk, ctrl_2;
2316
2317                 if (!host->preset_enabled) {
2318                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2319                         /*
2320                          * We only need to set Driver Strength if the
2321                          * preset value enable is not set.
2322                          */
2323                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2324                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
2325                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
2326                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
2327                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
2328                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2329                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
2330                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
2331                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
2332                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
2333                         else {
2334                                 pr_warn("%s: invalid driver type, default to driver type B\n",
2335                                         mmc_hostname(mmc));
2336                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2337                         }
2338
2339                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2340                 } else {
2341                         /*
2342                          * According to SDHC Spec v3.00, if the Preset Value
2343                          * Enable in the Host Control 2 register is set, we
2344                          * need to reset SD Clock Enable before changing High
2345                          * Speed Enable to avoid generating clock gliches.
2346                          */
2347
2348                         /* Reset SD Clock Enable */
2349                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2350                         clk &= ~SDHCI_CLOCK_CARD_EN;
2351                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2352
2353                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2354
2355                         /* Re-enable SD Clock */
2356                         host->ops->set_clock(host, host->clock);
2357                 }
2358
2359                 /* Reset SD Clock Enable */
2360                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2361                 clk &= ~SDHCI_CLOCK_CARD_EN;
2362                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2363
2364                 host->ops->set_uhs_signaling(host, ios->timing);
2365                 host->timing = ios->timing;
2366
2367                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
2368                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
2369                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
2370                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
2371                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
2372                                  (ios->timing == MMC_TIMING_UHS_DDR50) ||
2373                                  (ios->timing == MMC_TIMING_MMC_DDR52))) {
2374                         u16 preset;
2375
2376                         sdhci_enable_preset_value(host, true);
2377                         preset = sdhci_get_preset_value(host);
2378                         ios->drv_type = FIELD_GET(SDHCI_PRESET_DRV_MASK,
2379                                                   preset);
2380                 }
2381
2382                 /* Re-enable SD Clock */
2383                 host->ops->set_clock(host, host->clock);
2384         } else
2385                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2386
2387         /*
2388          * Some (ENE) controllers go apeshit on some ios operation,
2389          * signalling timeout and CRC errors even on CMD0. Resetting
2390          * it on each ios seems to solve the problem.
2391          */
2392         if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
2393                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
2394 }
2395 EXPORT_SYMBOL_GPL(sdhci_set_ios);
2396
2397 static int sdhci_get_cd(struct mmc_host *mmc)
2398 {
2399         struct sdhci_host *host = mmc_priv(mmc);
2400         int gpio_cd = mmc_gpio_get_cd(mmc);
2401
2402         if (host->flags & SDHCI_DEVICE_DEAD)
2403                 return 0;
2404
2405         /* If nonremovable, assume that the card is always present. */
2406         if (!mmc_card_is_removable(mmc))
2407                 return 1;
2408
2409         /*
2410          * Try slot gpio detect, if defined it take precedence
2411          * over build in controller functionality
2412          */
2413         if (gpio_cd >= 0)
2414                 return !!gpio_cd;
2415
2416         /* If polling, assume that the card is always present. */
2417         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2418                 return 1;
2419
2420         /* Host native card detect */
2421         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
2422 }
2423
2424 static int sdhci_check_ro(struct sdhci_host *host)
2425 {
2426         unsigned long flags;
2427         int is_readonly;
2428
2429         spin_lock_irqsave(&host->lock, flags);
2430
2431         if (host->flags & SDHCI_DEVICE_DEAD)
2432                 is_readonly = 0;
2433         else if (host->ops->get_ro)
2434                 is_readonly = host->ops->get_ro(host);
2435         else if (mmc_can_gpio_ro(host->mmc))
2436                 is_readonly = mmc_gpio_get_ro(host->mmc);
2437         else
2438                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
2439                                 & SDHCI_WRITE_PROTECT);
2440
2441         spin_unlock_irqrestore(&host->lock, flags);
2442
2443         /* This quirk needs to be replaced by a callback-function later */
2444         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
2445                 !is_readonly : is_readonly;
2446 }
2447
2448 #define SAMPLE_COUNT    5
2449
2450 static int sdhci_get_ro(struct mmc_host *mmc)
2451 {
2452         struct sdhci_host *host = mmc_priv(mmc);
2453         int i, ro_count;
2454
2455         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
2456                 return sdhci_check_ro(host);
2457
2458         ro_count = 0;
2459         for (i = 0; i < SAMPLE_COUNT; i++) {
2460                 if (sdhci_check_ro(host)) {
2461                         if (++ro_count > SAMPLE_COUNT / 2)
2462                                 return 1;
2463                 }
2464                 msleep(30);
2465         }
2466         return 0;
2467 }
2468
2469 static void sdhci_hw_reset(struct mmc_host *mmc)
2470 {
2471         struct sdhci_host *host = mmc_priv(mmc);
2472
2473         if (host->ops && host->ops->hw_reset)
2474                 host->ops->hw_reset(host);
2475 }
2476
2477 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
2478 {
2479         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
2480                 if (enable)
2481                         host->ier |= SDHCI_INT_CARD_INT;
2482                 else
2483                         host->ier &= ~SDHCI_INT_CARD_INT;
2484
2485                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2486                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2487         }
2488 }
2489
2490 void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
2491 {
2492         struct sdhci_host *host = mmc_priv(mmc);
2493         unsigned long flags;
2494
2495         if (enable)
2496                 pm_runtime_get_noresume(mmc_dev(mmc));
2497
2498         spin_lock_irqsave(&host->lock, flags);
2499         sdhci_enable_sdio_irq_nolock(host, enable);
2500         spin_unlock_irqrestore(&host->lock, flags);
2501
2502         if (!enable)
2503                 pm_runtime_put_noidle(mmc_dev(mmc));
2504 }
2505 EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
2506
2507 static void sdhci_ack_sdio_irq(struct mmc_host *mmc)
2508 {
2509         struct sdhci_host *host = mmc_priv(mmc);
2510         unsigned long flags;
2511
2512         spin_lock_irqsave(&host->lock, flags);
2513         sdhci_enable_sdio_irq_nolock(host, true);
2514         spin_unlock_irqrestore(&host->lock, flags);
2515 }
2516
2517 int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
2518                                       struct mmc_ios *ios)
2519 {
2520         struct sdhci_host *host = mmc_priv(mmc);
2521         u16 ctrl;
2522         int ret;
2523
2524         /*
2525          * Signal Voltage Switching is only applicable for Host Controllers
2526          * v3.00 and above.
2527          */
2528         if (host->version < SDHCI_SPEC_300)
2529                 return 0;
2530
2531         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2532
2533         switch (ios->signal_voltage) {
2534         case MMC_SIGNAL_VOLTAGE_330:
2535                 if (!(host->flags & SDHCI_SIGNALING_330))
2536                         return -EINVAL;
2537                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
2538                 ctrl &= ~SDHCI_CTRL_VDD_180;
2539                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2540
2541                 if (!IS_ERR(mmc->supply.vqmmc)) {
2542                         ret = mmc_regulator_set_vqmmc(mmc, ios);
2543                         if (ret < 0) {
2544                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
2545                                         mmc_hostname(mmc));
2546                                 return -EIO;
2547                         }
2548                 }
2549                 /* Wait for 5ms */
2550                 usleep_range(5000, 5500);
2551
2552                 /* 3.3V regulator output should be stable within 5 ms */
2553                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2554                 if (!(ctrl & SDHCI_CTRL_VDD_180))
2555                         return 0;
2556
2557                 pr_warn("%s: 3.3V regulator output did not become stable\n",
2558                         mmc_hostname(mmc));
2559
2560                 return -EAGAIN;
2561         case MMC_SIGNAL_VOLTAGE_180:
2562                 if (!(host->flags & SDHCI_SIGNALING_180))
2563                         return -EINVAL;
2564                 if (!IS_ERR(mmc->supply.vqmmc)) {
2565                         ret = mmc_regulator_set_vqmmc(mmc, ios);
2566                         if (ret < 0) {
2567                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
2568                                         mmc_hostname(mmc));
2569                                 return -EIO;
2570                         }
2571                 }
2572
2573                 /*
2574                  * Enable 1.8V Signal Enable in the Host Control2
2575                  * register
2576                  */
2577                 ctrl |= SDHCI_CTRL_VDD_180;
2578                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2579
2580                 /* Some controller need to do more when switching */
2581                 if (host->ops->voltage_switch)
2582                         host->ops->voltage_switch(host);
2583
2584                 /* 1.8V regulator output should be stable within 5 ms */
2585                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2586                 if (ctrl & SDHCI_CTRL_VDD_180)
2587                         return 0;
2588
2589                 pr_warn("%s: 1.8V regulator output did not become stable\n",
2590                         mmc_hostname(mmc));
2591
2592                 return -EAGAIN;
2593         case MMC_SIGNAL_VOLTAGE_120:
2594                 if (!(host->flags & SDHCI_SIGNALING_120))
2595                         return -EINVAL;
2596                 if (!IS_ERR(mmc->supply.vqmmc)) {
2597                         ret = mmc_regulator_set_vqmmc(mmc, ios);
2598                         if (ret < 0) {
2599                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
2600                                         mmc_hostname(mmc));
2601                                 return -EIO;
2602                         }
2603                 }
2604                 return 0;
2605         default:
2606                 /* No signal voltage switch required */
2607                 return 0;
2608         }
2609 }
2610 EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
2611
2612 static int sdhci_card_busy(struct mmc_host *mmc)
2613 {
2614         struct sdhci_host *host = mmc_priv(mmc);
2615         u32 present_state;
2616
2617         /* Check whether DAT[0] is 0 */
2618         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
2619
2620         return !(present_state & SDHCI_DATA_0_LVL_MASK);
2621 }
2622
2623 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
2624 {
2625         struct sdhci_host *host = mmc_priv(mmc);
2626         unsigned long flags;
2627
2628         spin_lock_irqsave(&host->lock, flags);
2629         host->flags |= SDHCI_HS400_TUNING;
2630         spin_unlock_irqrestore(&host->lock, flags);
2631
2632         return 0;
2633 }
2634
2635 void sdhci_start_tuning(struct sdhci_host *host)
2636 {
2637         u16 ctrl;
2638
2639         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2640         ctrl |= SDHCI_CTRL_EXEC_TUNING;
2641         if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
2642                 ctrl |= SDHCI_CTRL_TUNED_CLK;
2643         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2644
2645         /*
2646          * As per the Host Controller spec v3.00, tuning command
2647          * generates Buffer Read Ready interrupt, so enable that.
2648          *
2649          * Note: The spec clearly says that when tuning sequence
2650          * is being performed, the controller does not generate
2651          * interrupts other than Buffer Read Ready interrupt. But
2652          * to make sure we don't hit a controller bug, we _only_
2653          * enable Buffer Read Ready interrupt here.
2654          */
2655         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
2656         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
2657 }
2658 EXPORT_SYMBOL_GPL(sdhci_start_tuning);
2659
2660 void sdhci_end_tuning(struct sdhci_host *host)
2661 {
2662         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2663         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2664 }
2665 EXPORT_SYMBOL_GPL(sdhci_end_tuning);
2666
2667 void sdhci_reset_tuning(struct sdhci_host *host)
2668 {
2669         u16 ctrl;
2670
2671         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2672         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2673         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2674         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2675 }
2676 EXPORT_SYMBOL_GPL(sdhci_reset_tuning);
2677
2678 void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
2679 {
2680         sdhci_reset_tuning(host);
2681
2682         sdhci_do_reset(host, SDHCI_RESET_CMD);
2683         sdhci_do_reset(host, SDHCI_RESET_DATA);
2684
2685         sdhci_end_tuning(host);
2686
2687         mmc_send_abort_tuning(host->mmc, opcode);
2688 }
2689 EXPORT_SYMBOL_GPL(sdhci_abort_tuning);
2690
2691 /*
2692  * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2693  * tuning command does not have a data payload (or rather the hardware does it
2694  * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2695  * interrupt setup is different to other commands and there is no timeout
2696  * interrupt so special handling is needed.
2697  */
2698 void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
2699 {
2700         struct mmc_host *mmc = host->mmc;
2701         struct mmc_command cmd = {};
2702         struct mmc_request mrq = {};
2703         unsigned long flags;
2704         u32 b = host->sdma_boundary;
2705
2706         spin_lock_irqsave(&host->lock, flags);
2707
2708         cmd.opcode = opcode;
2709         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2710         cmd.mrq = &mrq;
2711
2712         mrq.cmd = &cmd;
2713         /*
2714          * In response to CMD19, the card sends 64 bytes of tuning
2715          * block to the Host Controller. So we set the block size
2716          * to 64 here.
2717          */
2718         if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2719             mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2720                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
2721         else
2722                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
2723
2724         /*
2725          * The tuning block is sent by the card to the host controller.
2726          * So we set the TRNS_READ bit in the Transfer Mode register.
2727          * This also takes care of setting DMA Enable and Multi Block
2728          * Select in the same register to 0.
2729          */
2730         sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2731
2732         if (!sdhci_send_command_retry(host, &cmd, flags)) {
2733                 spin_unlock_irqrestore(&host->lock, flags);
2734                 host->tuning_done = 0;
2735                 return;
2736         }
2737
2738         host->cmd = NULL;
2739
2740         sdhci_del_timer(host, &mrq);
2741
2742         host->tuning_done = 0;
2743
2744         spin_unlock_irqrestore(&host->lock, flags);
2745
2746         /* Wait for Buffer Read Ready interrupt */
2747         wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2748                            msecs_to_jiffies(50));
2749
2750 }
2751 EXPORT_SYMBOL_GPL(sdhci_send_tuning);
2752
2753 static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
2754 {
2755         int i;
2756
2757         /*
2758          * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2759          * of loops reaches tuning loop count.
2760          */
2761         for (i = 0; i < host->tuning_loop_count; i++) {
2762                 u16 ctrl;
2763
2764                 sdhci_send_tuning(host, opcode);
2765
2766                 if (!host->tuning_done) {
2767                         pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n",
2768                                  mmc_hostname(host->mmc));
2769                         sdhci_abort_tuning(host, opcode);
2770                         return -ETIMEDOUT;
2771                 }
2772
2773                 /* Spec does not require a delay between tuning cycles */
2774                 if (host->tuning_delay > 0)
2775                         mdelay(host->tuning_delay);
2776
2777                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2778                 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2779                         if (ctrl & SDHCI_CTRL_TUNED_CLK)
2780                                 return 0; /* Success! */
2781                         break;
2782                 }
2783
2784         }
2785
2786         pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2787                 mmc_hostname(host->mmc));
2788         sdhci_reset_tuning(host);
2789         return -EAGAIN;
2790 }
2791
2792 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2793 {
2794         struct sdhci_host *host = mmc_priv(mmc);
2795         int err = 0;
2796         unsigned int tuning_count = 0;
2797         bool hs400_tuning;
2798
2799         hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2800
2801         if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2802                 tuning_count = host->tuning_count;
2803
2804         /*
2805          * The Host Controller needs tuning in case of SDR104 and DDR50
2806          * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2807          * the Capabilities register.
2808          * If the Host Controller supports the HS200 mode then the
2809          * tuning function has to be executed.
2810          */
2811         switch (host->timing) {
2812         /* HS400 tuning is done in HS200 mode */
2813         case MMC_TIMING_MMC_HS400:
2814                 err = -EINVAL;
2815                 goto out;
2816
2817         case MMC_TIMING_MMC_HS200:
2818                 /*
2819                  * Periodic re-tuning for HS400 is not expected to be needed, so
2820                  * disable it here.
2821                  */
2822                 if (hs400_tuning)
2823                         tuning_count = 0;
2824                 break;
2825
2826         case MMC_TIMING_UHS_SDR104:
2827         case MMC_TIMING_UHS_DDR50:
2828                 break;
2829
2830         case MMC_TIMING_UHS_SDR50:
2831                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2832                         break;
2833                 fallthrough;
2834
2835         default:
2836                 goto out;
2837         }
2838
2839         if (host->ops->platform_execute_tuning) {
2840                 err = host->ops->platform_execute_tuning(host, opcode);
2841                 goto out;
2842         }
2843
2844         mmc->retune_period = tuning_count;
2845
2846         if (host->tuning_delay < 0)
2847                 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
2848
2849         sdhci_start_tuning(host);
2850
2851         host->tuning_err = __sdhci_execute_tuning(host, opcode);
2852
2853         sdhci_end_tuning(host);
2854 out:
2855         host->flags &= ~SDHCI_HS400_TUNING;
2856
2857         return err;
2858 }
2859 EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2860
2861 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2862 {
2863         /* Host Controller v3.00 defines preset value registers */
2864         if (host->version < SDHCI_SPEC_300)
2865                 return;
2866
2867         /*
2868          * We only enable or disable Preset Value if they are not already
2869          * enabled or disabled respectively. Otherwise, we bail out.
2870          */
2871         if (host->preset_enabled != enable) {
2872                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2873
2874                 if (enable)
2875                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2876                 else
2877                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2878
2879                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2880
2881                 if (enable)
2882                         host->flags |= SDHCI_PV_ENABLED;
2883                 else
2884                         host->flags &= ~SDHCI_PV_ENABLED;
2885
2886                 host->preset_enabled = enable;
2887         }
2888 }
2889
2890 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2891                                 int err)
2892 {
2893         struct mmc_data *data = mrq->data;
2894
2895         if (data->host_cookie != COOKIE_UNMAPPED)
2896                 dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
2897                              mmc_get_dma_dir(data));
2898
2899         data->host_cookie = COOKIE_UNMAPPED;
2900 }
2901
2902 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2903 {
2904         struct sdhci_host *host = mmc_priv(mmc);
2905
2906         mrq->data->host_cookie = COOKIE_UNMAPPED;
2907
2908         /*
2909          * No pre-mapping in the pre hook if we're using the bounce buffer,
2910          * for that we would need two bounce buffers since one buffer is
2911          * in flight when this is getting called.
2912          */
2913         if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer)
2914                 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2915 }
2916
2917 static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
2918 {
2919         if (host->data_cmd) {
2920                 host->data_cmd->error = err;
2921                 sdhci_finish_mrq(host, host->data_cmd->mrq);
2922         }
2923
2924         if (host->cmd) {
2925                 host->cmd->error = err;
2926                 sdhci_finish_mrq(host, host->cmd->mrq);
2927         }
2928 }
2929
2930 static void sdhci_card_event(struct mmc_host *mmc)
2931 {
2932         struct sdhci_host *host = mmc_priv(mmc);
2933         unsigned long flags;
2934         int present;
2935
2936         /* First check if client has provided their own card event */
2937         if (host->ops->card_event)
2938                 host->ops->card_event(host);
2939
2940         present = mmc->ops->get_cd(mmc);
2941
2942         spin_lock_irqsave(&host->lock, flags);
2943
2944         /* Check sdhci_has_requests() first in case we are runtime suspended */
2945         if (sdhci_has_requests(host) && !present) {
2946                 pr_err("%s: Card removed during transfer!\n",
2947                         mmc_hostname(mmc));
2948                 pr_err("%s: Resetting controller.\n",
2949                         mmc_hostname(mmc));
2950
2951                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2952                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2953
2954                 sdhci_error_out_mrqs(host, -ENOMEDIUM);
2955         }
2956
2957         spin_unlock_irqrestore(&host->lock, flags);
2958 }
2959
2960 static const struct mmc_host_ops sdhci_ops = {
2961         .request        = sdhci_request,
2962         .post_req       = sdhci_post_req,
2963         .pre_req        = sdhci_pre_req,
2964         .set_ios        = sdhci_set_ios,
2965         .get_cd         = sdhci_get_cd,
2966         .get_ro         = sdhci_get_ro,
2967         .hw_reset       = sdhci_hw_reset,
2968         .enable_sdio_irq = sdhci_enable_sdio_irq,
2969         .ack_sdio_irq    = sdhci_ack_sdio_irq,
2970         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2971         .prepare_hs400_tuning           = sdhci_prepare_hs400_tuning,
2972         .execute_tuning                 = sdhci_execute_tuning,
2973         .card_event                     = sdhci_card_event,
2974         .card_busy      = sdhci_card_busy,
2975 };
2976
2977 /*****************************************************************************\
2978  *                                                                           *
2979  * Request done                                                              *
2980  *                                                                           *
2981 \*****************************************************************************/
2982
2983 static bool sdhci_request_done(struct sdhci_host *host)
2984 {
2985         unsigned long flags;
2986         struct mmc_request *mrq;
2987         int i;
2988
2989         spin_lock_irqsave(&host->lock, flags);
2990
2991         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
2992                 mrq = host->mrqs_done[i];
2993                 if (mrq)
2994                         break;
2995         }
2996
2997         if (!mrq) {
2998                 spin_unlock_irqrestore(&host->lock, flags);
2999                 return true;
3000         }
3001
3002         /*
3003          * The controller needs a reset of internal state machines
3004          * upon error conditions.
3005          */
3006         if (sdhci_needs_reset(host, mrq)) {
3007                 /*
3008                  * Do not finish until command and data lines are available for
3009                  * reset. Note there can only be one other mrq, so it cannot
3010                  * also be in mrqs_done, otherwise host->cmd and host->data_cmd
3011                  * would both be null.
3012                  */
3013                 if (host->cmd || host->data_cmd) {
3014                         spin_unlock_irqrestore(&host->lock, flags);
3015                         return true;
3016                 }
3017
3018                 /* Some controllers need this kick or reset won't work here */
3019                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
3020                         /* This is to force an update */
3021                         host->ops->set_clock(host, host->clock);
3022
3023                 /*
3024                  * Spec says we should do both at the same time, but Ricoh
3025                  * controllers do not like that.
3026                  */
3027                 sdhci_do_reset(host, SDHCI_RESET_CMD);
3028                 sdhci_do_reset(host, SDHCI_RESET_DATA);
3029
3030                 host->pending_reset = false;
3031         }
3032
3033         /*
3034          * Always unmap the data buffers if they were mapped by
3035          * sdhci_prepare_data() whenever we finish with a request.
3036          * This avoids leaking DMA mappings on error.
3037          */
3038         if (host->flags & SDHCI_REQ_USE_DMA) {
3039                 struct mmc_data *data = mrq->data;
3040
3041                 if (host->use_external_dma && data &&
3042                     (mrq->cmd->error || data->error)) {
3043                         struct dma_chan *chan = sdhci_external_dma_channel(host, data);
3044
3045                         host->mrqs_done[i] = NULL;
3046                         spin_unlock_irqrestore(&host->lock, flags);
3047                         dmaengine_terminate_sync(chan);
3048                         spin_lock_irqsave(&host->lock, flags);
3049                         sdhci_set_mrq_done(host, mrq);
3050                 }
3051
3052                 if (data && data->host_cookie == COOKIE_MAPPED) {
3053                         if (host->bounce_buffer) {
3054                                 /*
3055                                  * On reads, copy the bounced data into the
3056                                  * sglist
3057                                  */
3058                                 if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) {
3059                                         unsigned int length = data->bytes_xfered;
3060
3061                                         if (length > host->bounce_buffer_size) {
3062                                                 pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n",
3063                                                        mmc_hostname(host->mmc),
3064                                                        host->bounce_buffer_size,
3065                                                        data->bytes_xfered);
3066                                                 /* Cap it down and continue */
3067                                                 length = host->bounce_buffer_size;
3068                                         }
3069                                         dma_sync_single_for_cpu(
3070                                                 mmc_dev(host->mmc),
3071                                                 host->bounce_addr,
3072                                                 host->bounce_buffer_size,
3073                                                 DMA_FROM_DEVICE);
3074                                         sg_copy_from_buffer(data->sg,
3075                                                 data->sg_len,
3076                                                 host->bounce_buffer,
3077                                                 length);
3078                                 } else {
3079                                         /* No copying, just switch ownership */
3080                                         dma_sync_single_for_cpu(
3081                                                 mmc_dev(host->mmc),
3082                                                 host->bounce_addr,
3083                                                 host->bounce_buffer_size,
3084                                                 mmc_get_dma_dir(data));
3085                                 }
3086                         } else {
3087                                 /* Unmap the raw data */
3088                                 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
3089                                              data->sg_len,
3090                                              mmc_get_dma_dir(data));
3091                         }
3092                         data->host_cookie = COOKIE_UNMAPPED;
3093                 }
3094         }
3095
3096         host->mrqs_done[i] = NULL;
3097
3098         spin_unlock_irqrestore(&host->lock, flags);
3099
3100         if (host->ops->request_done)
3101                 host->ops->request_done(host, mrq);
3102         else
3103                 mmc_request_done(host->mmc, mrq);
3104
3105         return false;
3106 }
3107
3108 static void sdhci_complete_work(struct work_struct *work)
3109 {
3110         struct sdhci_host *host = container_of(work, struct sdhci_host,
3111                                                complete_work);
3112
3113         while (!sdhci_request_done(host))
3114                 ;
3115 }
3116
3117 static void sdhci_timeout_timer(struct timer_list *t)
3118 {
3119         struct sdhci_host *host;
3120         unsigned long flags;
3121
3122         host = from_timer(host, t, timer);
3123
3124         spin_lock_irqsave(&host->lock, flags);
3125
3126         if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
3127                 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
3128                        mmc_hostname(host->mmc));
3129                 sdhci_dumpregs(host);
3130
3131                 host->cmd->error = -ETIMEDOUT;
3132                 sdhci_finish_mrq(host, host->cmd->mrq);
3133         }
3134
3135         spin_unlock_irqrestore(&host->lock, flags);
3136 }
3137
3138 static void sdhci_timeout_data_timer(struct timer_list *t)
3139 {
3140         struct sdhci_host *host;
3141         unsigned long flags;
3142
3143         host = from_timer(host, t, data_timer);
3144
3145         spin_lock_irqsave(&host->lock, flags);
3146
3147         if (host->data || host->data_cmd ||
3148             (host->cmd && sdhci_data_line_cmd(host->cmd))) {
3149                 pr_err("%s: Timeout waiting for hardware interrupt.\n",
3150                        mmc_hostname(host->mmc));
3151                 sdhci_dumpregs(host);
3152
3153                 if (host->data) {
3154                         host->data->error = -ETIMEDOUT;
3155                         __sdhci_finish_data(host, true);
3156                         queue_work(host->complete_wq, &host->complete_work);
3157                 } else if (host->data_cmd) {
3158                         host->data_cmd->error = -ETIMEDOUT;
3159                         sdhci_finish_mrq(host, host->data_cmd->mrq);
3160                 } else {
3161                         host->cmd->error = -ETIMEDOUT;
3162                         sdhci_finish_mrq(host, host->cmd->mrq);
3163                 }
3164         }
3165
3166         spin_unlock_irqrestore(&host->lock, flags);
3167 }
3168
3169 /*****************************************************************************\
3170  *                                                                           *
3171  * Interrupt handling                                                        *
3172  *                                                                           *
3173 \*****************************************************************************/
3174
3175 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
3176 {
3177         /* Handle auto-CMD12 error */
3178         if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) {
3179                 struct mmc_request *mrq = host->data_cmd->mrq;
3180                 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3181                 int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3182                                    SDHCI_INT_DATA_TIMEOUT :
3183                                    SDHCI_INT_DATA_CRC;
3184
3185                 /* Treat auto-CMD12 error the same as data error */
3186                 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
3187                         *intmask_p |= data_err_bit;
3188                         return;
3189                 }
3190         }
3191
3192         if (!host->cmd) {
3193                 /*
3194                  * SDHCI recovers from errors by resetting the cmd and data
3195                  * circuits.  Until that is done, there very well might be more
3196                  * interrupts, so ignore them in that case.
3197                  */
3198                 if (host->pending_reset)
3199                         return;
3200                 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
3201                        mmc_hostname(host->mmc), (unsigned)intmask);
3202                 sdhci_dumpregs(host);
3203                 return;
3204         }
3205
3206         if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
3207                        SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
3208                 if (intmask & SDHCI_INT_TIMEOUT)
3209                         host->cmd->error = -ETIMEDOUT;
3210                 else
3211                         host->cmd->error = -EILSEQ;
3212
3213                 /* Treat data command CRC error the same as data CRC error */
3214                 if (host->cmd->data &&
3215                     (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
3216                      SDHCI_INT_CRC) {
3217                         host->cmd = NULL;
3218                         *intmask_p |= SDHCI_INT_DATA_CRC;
3219                         return;
3220                 }
3221
3222                 __sdhci_finish_mrq(host, host->cmd->mrq);
3223                 return;
3224         }
3225
3226         /* Handle auto-CMD23 error */
3227         if (intmask & SDHCI_INT_AUTO_CMD_ERR) {
3228                 struct mmc_request *mrq = host->cmd->mrq;
3229                 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3230                 int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3231                           -ETIMEDOUT :
3232                           -EILSEQ;
3233
3234                 if (mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
3235                         mrq->sbc->error = err;
3236                         __sdhci_finish_mrq(host, mrq);
3237                         return;
3238                 }
3239         }
3240
3241         if (intmask & SDHCI_INT_RESPONSE)
3242                 sdhci_finish_command(host);
3243 }
3244
3245 static void sdhci_adma_show_error(struct sdhci_host *host)
3246 {
3247         void *desc = host->adma_table;
3248         dma_addr_t dma = host->adma_addr;
3249
3250         sdhci_dumpregs(host);
3251
3252         while (true) {
3253                 struct sdhci_adma2_64_desc *dma_desc = desc;
3254
3255                 if (host->flags & SDHCI_USE_64_BIT_DMA)
3256                         SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
3257                             (unsigned long long)dma,
3258                             le32_to_cpu(dma_desc->addr_hi),
3259                             le32_to_cpu(dma_desc->addr_lo),
3260                             le16_to_cpu(dma_desc->len),
3261                             le16_to_cpu(dma_desc->cmd));
3262                 else
3263                         SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
3264                             (unsigned long long)dma,
3265                             le32_to_cpu(dma_desc->addr_lo),
3266                             le16_to_cpu(dma_desc->len),
3267                             le16_to_cpu(dma_desc->cmd));
3268
3269                 desc += host->desc_sz;
3270                 dma += host->desc_sz;
3271
3272                 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
3273                         break;
3274         }
3275 }
3276
3277 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
3278 {
3279         u32 command;
3280
3281         /* CMD19 generates _only_ Buffer Read Ready interrupt */
3282         if (intmask & SDHCI_INT_DATA_AVAIL) {
3283                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
3284                 if (command == MMC_SEND_TUNING_BLOCK ||
3285                     command == MMC_SEND_TUNING_BLOCK_HS200) {
3286                         host->tuning_done = 1;
3287                         wake_up(&host->buf_ready_int);
3288                         return;
3289                 }
3290         }
3291
3292         if (!host->data) {
3293                 struct mmc_command *data_cmd = host->data_cmd;
3294
3295                 /*
3296                  * The "data complete" interrupt is also used to
3297                  * indicate that a busy state has ended. See comment
3298                  * above in sdhci_cmd_irq().
3299                  */
3300                 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
3301                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
3302                                 host->data_cmd = NULL;
3303                                 data_cmd->error = -ETIMEDOUT;
3304                                 __sdhci_finish_mrq(host, data_cmd->mrq);
3305                                 return;
3306                         }
3307                         if (intmask & SDHCI_INT_DATA_END) {
3308                                 host->data_cmd = NULL;
3309                                 /*
3310                                  * Some cards handle busy-end interrupt
3311                                  * before the command completed, so make
3312                                  * sure we do things in the proper order.
3313                                  */
3314                                 if (host->cmd == data_cmd)
3315                                         return;
3316
3317                                 __sdhci_finish_mrq(host, data_cmd->mrq);
3318                                 return;
3319                         }
3320                 }
3321
3322                 /*
3323                  * SDHCI recovers from errors by resetting the cmd and data
3324                  * circuits. Until that is done, there very well might be more
3325                  * interrupts, so ignore them in that case.
3326                  */
3327                 if (host->pending_reset)
3328                         return;
3329
3330                 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
3331                        mmc_hostname(host->mmc), (unsigned)intmask);
3332                 sdhci_dumpregs(host);
3333
3334                 return;
3335         }
3336
3337         if (intmask & SDHCI_INT_DATA_TIMEOUT)
3338                 host->data->error = -ETIMEDOUT;
3339         else if (intmask & SDHCI_INT_DATA_END_BIT)
3340                 host->data->error = -EILSEQ;
3341         else if ((intmask & SDHCI_INT_DATA_CRC) &&
3342                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
3343                         != MMC_BUS_TEST_R)
3344                 host->data->error = -EILSEQ;
3345         else if (intmask & SDHCI_INT_ADMA_ERROR) {
3346                 pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
3347                        intmask);
3348                 sdhci_adma_show_error(host);
3349                 host->data->error = -EIO;
3350                 if (host->ops->adma_workaround)
3351                         host->ops->adma_workaround(host, intmask);
3352         }
3353
3354         if (host->data->error)
3355                 sdhci_finish_data(host);
3356         else {
3357                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
3358                         sdhci_transfer_pio(host);
3359
3360                 /*
3361                  * We currently don't do anything fancy with DMA
3362                  * boundaries, but as we can't disable the feature
3363                  * we need to at least restart the transfer.
3364                  *
3365                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
3366                  * should return a valid address to continue from, but as
3367                  * some controllers are faulty, don't trust them.
3368                  */
3369                 if (intmask & SDHCI_INT_DMA_END) {
3370                         dma_addr_t dmastart, dmanow;
3371
3372                         dmastart = sdhci_sdma_address(host);
3373                         dmanow = dmastart + host->data->bytes_xfered;
3374                         /*
3375                          * Force update to the next DMA block boundary.
3376                          */
3377                         dmanow = (dmanow &
3378                                 ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
3379                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
3380                         host->data->bytes_xfered = dmanow - dmastart;
3381                         DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n",
3382                             &dmastart, host->data->bytes_xfered, &dmanow);
3383                         sdhci_set_sdma_addr(host, dmanow);
3384                 }
3385
3386                 if (intmask & SDHCI_INT_DATA_END) {
3387                         if (host->cmd == host->data_cmd) {
3388                                 /*
3389                                  * Data managed to finish before the
3390                                  * command completed. Make sure we do
3391                                  * things in the proper order.
3392                                  */
3393                                 host->data_early = 1;
3394                         } else {
3395                                 sdhci_finish_data(host);
3396                         }
3397                 }
3398         }
3399 }
3400
3401 static inline bool sdhci_defer_done(struct sdhci_host *host,
3402                                     struct mmc_request *mrq)
3403 {
3404         struct mmc_data *data = mrq->data;
3405
3406         return host->pending_reset || host->always_defer_done ||
3407                ((host->flags & SDHCI_REQ_USE_DMA) && data &&
3408                 data->host_cookie == COOKIE_MAPPED);
3409 }
3410
3411 static irqreturn_t sdhci_irq(int irq, void *dev_id)
3412 {
3413         struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
3414         irqreturn_t result = IRQ_NONE;
3415         struct sdhci_host *host = dev_id;
3416         u32 intmask, mask, unexpected = 0;
3417         int max_loops = 16;
3418         int i;
3419
3420         spin_lock(&host->lock);
3421
3422         if (host->runtime_suspended) {
3423                 spin_unlock(&host->lock);
3424                 return IRQ_NONE;
3425         }
3426
3427         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3428         if (!intmask || intmask == 0xffffffff) {
3429                 result = IRQ_NONE;
3430                 goto out;
3431         }
3432
3433         do {
3434                 DBG("IRQ status 0x%08x\n", intmask);
3435
3436                 if (host->ops->irq) {
3437                         intmask = host->ops->irq(host, intmask);
3438                         if (!intmask)
3439                                 goto cont;
3440                 }
3441
3442                 /* Clear selected interrupts. */
3443                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3444                                   SDHCI_INT_BUS_POWER);
3445                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3446
3447                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3448                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
3449                                       SDHCI_CARD_PRESENT;
3450
3451                         /*
3452                          * There is a observation on i.mx esdhc.  INSERT
3453                          * bit will be immediately set again when it gets
3454                          * cleared, if a card is inserted.  We have to mask
3455                          * the irq to prevent interrupt storm which will
3456                          * freeze the system.  And the REMOVE gets the
3457                          * same situation.
3458                          *
3459                          * More testing are needed here to ensure it works
3460                          * for other platforms though.
3461                          */
3462                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
3463                                        SDHCI_INT_CARD_REMOVE);
3464                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
3465                                                SDHCI_INT_CARD_INSERT;
3466                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3467                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3468
3469                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
3470                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
3471
3472                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
3473                                                        SDHCI_INT_CARD_REMOVE);
3474                         result = IRQ_WAKE_THREAD;
3475                 }
3476
3477                 if (intmask & SDHCI_INT_CMD_MASK)
3478                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask);
3479
3480                 if (intmask & SDHCI_INT_DATA_MASK)
3481                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
3482
3483                 if (intmask & SDHCI_INT_BUS_POWER)
3484                         pr_err("%s: Card is consuming too much power!\n",
3485                                 mmc_hostname(host->mmc));
3486
3487                 if (intmask & SDHCI_INT_RETUNE)
3488                         mmc_retune_needed(host->mmc);
3489
3490                 if ((intmask & SDHCI_INT_CARD_INT) &&
3491                     (host->ier & SDHCI_INT_CARD_INT)) {
3492                         sdhci_enable_sdio_irq_nolock(host, false);
3493                         sdio_signal_irq(host->mmc);
3494                 }
3495
3496                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
3497                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3498                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
3499                              SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
3500
3501                 if (intmask) {
3502                         unexpected |= intmask;
3503                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3504                 }
3505 cont:
3506                 if (result == IRQ_NONE)
3507                         result = IRQ_HANDLED;
3508
3509                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3510         } while (intmask && --max_loops);
3511
3512         /* Determine if mrqs can be completed immediately */
3513         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3514                 struct mmc_request *mrq = host->mrqs_done[i];
3515
3516                 if (!mrq)
3517                         continue;
3518
3519                 if (sdhci_defer_done(host, mrq)) {
3520                         result = IRQ_WAKE_THREAD;
3521                 } else {
3522                         mrqs_done[i] = mrq;
3523                         host->mrqs_done[i] = NULL;
3524                 }
3525         }
3526 out:
3527         if (host->deferred_cmd)
3528                 result = IRQ_WAKE_THREAD;
3529
3530         spin_unlock(&host->lock);
3531
3532         /* Process mrqs ready for immediate completion */
3533         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3534                 if (!mrqs_done[i])
3535                         continue;
3536
3537                 if (host->ops->request_done)
3538                         host->ops->request_done(host, mrqs_done[i]);
3539                 else
3540                         mmc_request_done(host->mmc, mrqs_done[i]);
3541         }
3542
3543         if (unexpected) {
3544                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
3545                            mmc_hostname(host->mmc), unexpected);
3546                 sdhci_dumpregs(host);
3547         }
3548
3549         return result;
3550 }
3551
3552 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
3553 {
3554         struct sdhci_host *host = dev_id;
3555         struct mmc_command *cmd;
3556         unsigned long flags;
3557         u32 isr;
3558
3559         while (!sdhci_request_done(host))
3560                 ;
3561
3562         spin_lock_irqsave(&host->lock, flags);
3563
3564         isr = host->thread_isr;
3565         host->thread_isr = 0;
3566
3567         cmd = host->deferred_cmd;
3568         if (cmd && !sdhci_send_command_retry(host, cmd, flags))
3569                 sdhci_finish_mrq(host, cmd->mrq);
3570
3571         spin_unlock_irqrestore(&host->lock, flags);
3572
3573         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3574                 struct mmc_host *mmc = host->mmc;
3575
3576                 mmc->ops->card_event(mmc);
3577                 mmc_detect_change(mmc, msecs_to_jiffies(200));
3578         }
3579
3580         return IRQ_HANDLED;
3581 }
3582
3583 /*****************************************************************************\
3584  *                                                                           *
3585  * Suspend/resume                                                            *
3586  *                                                                           *
3587 \*****************************************************************************/
3588
3589 #ifdef CONFIG_PM
3590
3591 static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
3592 {
3593         return mmc_card_is_removable(host->mmc) &&
3594                !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3595                !mmc_can_gpio_cd(host->mmc);
3596 }
3597
3598 /*
3599  * To enable wakeup events, the corresponding events have to be enabled in
3600  * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
3601  * Table' in the SD Host Controller Standard Specification.
3602  * It is useless to restore SDHCI_INT_ENABLE state in
3603  * sdhci_disable_irq_wakeups() since it will be set by
3604  * sdhci_enable_card_detection() or sdhci_init().
3605  */
3606 static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
3607 {
3608         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
3609                   SDHCI_WAKE_ON_INT;
3610         u32 irq_val = 0;
3611         u8 wake_val = 0;
3612         u8 val;
3613
3614         if (sdhci_cd_irq_can_wakeup(host)) {
3615                 wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
3616                 irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
3617         }
3618
3619         if (mmc_card_wake_sdio_irq(host->mmc)) {
3620                 wake_val |= SDHCI_WAKE_ON_INT;
3621                 irq_val |= SDHCI_INT_CARD_INT;
3622         }
3623
3624         if (!irq_val)
3625                 return false;
3626
3627         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3628         val &= ~mask;
3629         val |= wake_val;
3630         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3631
3632         sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
3633
3634         host->irq_wake_enabled = !enable_irq_wake(host->irq);
3635
3636         return host->irq_wake_enabled;
3637 }
3638
3639 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
3640 {
3641         u8 val;
3642         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
3643                         | SDHCI_WAKE_ON_INT;
3644
3645         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3646         val &= ~mask;
3647         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3648
3649         disable_irq_wake(host->irq);
3650
3651         host->irq_wake_enabled = false;
3652 }
3653
3654 int sdhci_suspend_host(struct sdhci_host *host)
3655 {
3656         sdhci_disable_card_detection(host);
3657
3658         mmc_retune_timer_stop(host->mmc);
3659
3660         if (!device_may_wakeup(mmc_dev(host->mmc)) ||
3661             !sdhci_enable_irq_wakeups(host)) {
3662                 host->ier = 0;
3663                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3664                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3665                 free_irq(host->irq, host);
3666         }
3667
3668         return 0;
3669 }
3670
3671 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
3672
3673 int sdhci_resume_host(struct sdhci_host *host)
3674 {
3675         struct mmc_host *mmc = host->mmc;
3676         int ret = 0;
3677
3678         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3679                 if (host->ops->enable_dma)
3680                         host->ops->enable_dma(host);
3681         }
3682
3683         if ((mmc->pm_flags & MMC_PM_KEEP_POWER) &&
3684             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
3685                 /* Card keeps power but host controller does not */
3686                 sdhci_init(host, 0);
3687                 host->pwr = 0;
3688                 host->clock = 0;
3689                 mmc->ops->set_ios(mmc, &mmc->ios);
3690         } else {
3691                 sdhci_init(host, (mmc->pm_flags & MMC_PM_KEEP_POWER));
3692         }
3693
3694         if (host->irq_wake_enabled) {
3695                 sdhci_disable_irq_wakeups(host);
3696         } else {
3697                 ret = request_threaded_irq(host->irq, sdhci_irq,
3698                                            sdhci_thread_irq, IRQF_SHARED,
3699                                            mmc_hostname(mmc), host);
3700                 if (ret)
3701                         return ret;
3702         }
3703
3704         sdhci_enable_card_detection(host);
3705
3706         return ret;
3707 }
3708
3709 EXPORT_SYMBOL_GPL(sdhci_resume_host);
3710
3711 int sdhci_runtime_suspend_host(struct sdhci_host *host)
3712 {
3713         unsigned long flags;
3714
3715         mmc_retune_timer_stop(host->mmc);
3716
3717         spin_lock_irqsave(&host->lock, flags);
3718         host->ier &= SDHCI_INT_CARD_INT;
3719         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3720         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3721         spin_unlock_irqrestore(&host->lock, flags);
3722
3723         synchronize_hardirq(host->irq);
3724
3725         spin_lock_irqsave(&host->lock, flags);
3726         host->runtime_suspended = true;
3727         spin_unlock_irqrestore(&host->lock, flags);
3728
3729         return 0;
3730 }
3731 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
3732
3733 int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset)
3734 {
3735         struct mmc_host *mmc = host->mmc;
3736         unsigned long flags;
3737         int host_flags = host->flags;
3738
3739         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3740                 if (host->ops->enable_dma)
3741                         host->ops->enable_dma(host);
3742         }
3743
3744         sdhci_init(host, soft_reset);
3745
3746         if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
3747             mmc->ios.power_mode != MMC_POWER_OFF) {
3748                 /* Force clock and power re-program */
3749                 host->pwr = 0;
3750                 host->clock = 0;
3751                 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
3752                 mmc->ops->set_ios(mmc, &mmc->ios);
3753
3754                 if ((host_flags & SDHCI_PV_ENABLED) &&
3755                     !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
3756                         spin_lock_irqsave(&host->lock, flags);
3757                         sdhci_enable_preset_value(host, true);
3758                         spin_unlock_irqrestore(&host->lock, flags);
3759                 }
3760
3761                 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
3762                     mmc->ops->hs400_enhanced_strobe)
3763                         mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
3764         }
3765
3766         spin_lock_irqsave(&host->lock, flags);
3767
3768         host->runtime_suspended = false;
3769
3770         /* Enable SDIO IRQ */
3771         if (sdio_irq_claimed(mmc))
3772                 sdhci_enable_sdio_irq_nolock(host, true);
3773
3774         /* Enable Card Detection */
3775         sdhci_enable_card_detection(host);
3776
3777         spin_unlock_irqrestore(&host->lock, flags);
3778
3779         return 0;
3780 }
3781 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
3782
3783 #endif /* CONFIG_PM */
3784
3785 /*****************************************************************************\
3786  *                                                                           *
3787  * Command Queue Engine (CQE) helpers                                        *
3788  *                                                                           *
3789 \*****************************************************************************/
3790
3791 void sdhci_cqe_enable(struct mmc_host *mmc)
3792 {
3793         struct sdhci_host *host = mmc_priv(mmc);
3794         unsigned long flags;
3795         u8 ctrl;
3796
3797         spin_lock_irqsave(&host->lock, flags);
3798
3799         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
3800         ctrl &= ~SDHCI_CTRL_DMA_MASK;
3801         /*
3802          * Host from V4.10 supports ADMA3 DMA type.
3803          * ADMA3 performs integrated descriptor which is more suitable
3804          * for cmd queuing to fetch both command and transfer descriptors.
3805          */
3806         if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3))
3807                 ctrl |= SDHCI_CTRL_ADMA3;
3808         else if (host->flags & SDHCI_USE_64_BIT_DMA)
3809                 ctrl |= SDHCI_CTRL_ADMA64;
3810         else
3811                 ctrl |= SDHCI_CTRL_ADMA32;
3812         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
3813
3814         sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
3815                      SDHCI_BLOCK_SIZE);
3816
3817         /* Set maximum timeout */
3818         sdhci_set_timeout(host, NULL);
3819
3820         host->ier = host->cqe_ier;
3821
3822         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3823         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3824
3825         host->cqe_on = true;
3826
3827         pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
3828                  mmc_hostname(mmc), host->ier,
3829                  sdhci_readl(host, SDHCI_INT_STATUS));
3830
3831         spin_unlock_irqrestore(&host->lock, flags);
3832 }
3833 EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
3834
3835 void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
3836 {
3837         struct sdhci_host *host = mmc_priv(mmc);
3838         unsigned long flags;
3839
3840         spin_lock_irqsave(&host->lock, flags);
3841
3842         sdhci_set_default_irqs(host);
3843
3844         host->cqe_on = false;
3845
3846         if (recovery) {
3847                 sdhci_do_reset(host, SDHCI_RESET_CMD);
3848                 sdhci_do_reset(host, SDHCI_RESET_DATA);
3849         }
3850
3851         pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
3852                  mmc_hostname(mmc), host->ier,
3853                  sdhci_readl(host, SDHCI_INT_STATUS));
3854
3855         spin_unlock_irqrestore(&host->lock, flags);
3856 }
3857 EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
3858
3859 bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
3860                    int *data_error)
3861 {
3862         u32 mask;
3863
3864         if (!host->cqe_on)
3865                 return false;
3866
3867         if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
3868                 *cmd_error = -EILSEQ;
3869         else if (intmask & SDHCI_INT_TIMEOUT)
3870                 *cmd_error = -ETIMEDOUT;
3871         else
3872                 *cmd_error = 0;
3873
3874         if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
3875                 *data_error = -EILSEQ;
3876         else if (intmask & SDHCI_INT_DATA_TIMEOUT)
3877                 *data_error = -ETIMEDOUT;
3878         else if (intmask & SDHCI_INT_ADMA_ERROR)
3879                 *data_error = -EIO;
3880         else
3881                 *data_error = 0;
3882
3883         /* Clear selected interrupts. */
3884         mask = intmask & host->cqe_ier;
3885         sdhci_writel(host, mask, SDHCI_INT_STATUS);
3886
3887         if (intmask & SDHCI_INT_BUS_POWER)
3888                 pr_err("%s: Card is consuming too much power!\n",
3889                        mmc_hostname(host->mmc));
3890
3891         intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
3892         if (intmask) {
3893                 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3894                 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
3895                        mmc_hostname(host->mmc), intmask);
3896                 sdhci_dumpregs(host);
3897         }
3898
3899         return true;
3900 }
3901 EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
3902
3903 /*****************************************************************************\
3904  *                                                                           *
3905  * Device allocation/registration                                            *
3906  *                                                                           *
3907 \*****************************************************************************/
3908
3909 struct sdhci_host *sdhci_alloc_host(struct device *dev,
3910         size_t priv_size)
3911 {
3912         struct mmc_host *mmc;
3913         struct sdhci_host *host;
3914
3915         WARN_ON(dev == NULL);
3916
3917         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
3918         if (!mmc)
3919                 return ERR_PTR(-ENOMEM);
3920
3921         host = mmc_priv(mmc);
3922         host->mmc = mmc;
3923         host->mmc_host_ops = sdhci_ops;
3924         mmc->ops = &host->mmc_host_ops;
3925
3926         host->flags = SDHCI_SIGNALING_330;
3927
3928         host->cqe_ier     = SDHCI_CQE_INT_MASK;
3929         host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
3930
3931         host->tuning_delay = -1;
3932         host->tuning_loop_count = MAX_TUNING_LOOP;
3933
3934         host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
3935
3936         /*
3937          * The DMA table descriptor count is calculated as the maximum
3938          * number of segments times 2, to allow for an alignment
3939          * descriptor for each segment, plus 1 for a nop end descriptor.
3940          */
3941         host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
3942
3943         return host;
3944 }
3945
3946 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
3947
3948 static int sdhci_set_dma_mask(struct sdhci_host *host)
3949 {
3950         struct mmc_host *mmc = host->mmc;
3951         struct device *dev = mmc_dev(mmc);
3952         int ret = -EINVAL;
3953
3954         if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
3955                 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3956
3957         /* Try 64-bit mask if hardware is capable  of it */
3958         if (host->flags & SDHCI_USE_64_BIT_DMA) {
3959                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
3960                 if (ret) {
3961                         pr_warn("%s: Failed to set 64-bit DMA mask.\n",
3962                                 mmc_hostname(mmc));
3963                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
3964                 }
3965         }
3966
3967         /* 32-bit mask as default & fallback */
3968         if (ret) {
3969                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
3970                 if (ret)
3971                         pr_warn("%s: Failed to set 32-bit DMA mask.\n",
3972                                 mmc_hostname(mmc));
3973         }
3974
3975         return ret;
3976 }
3977
3978 void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver,
3979                        const u32 *caps, const u32 *caps1)
3980 {
3981         u16 v;
3982         u64 dt_caps_mask = 0;
3983         u64 dt_caps = 0;
3984
3985         if (host->read_caps)
3986                 return;
3987
3988         host->read_caps = true;
3989
3990         if (debug_quirks)
3991                 host->quirks = debug_quirks;
3992
3993         if (debug_quirks2)
3994                 host->quirks2 = debug_quirks2;
3995
3996         sdhci_do_reset(host, SDHCI_RESET_ALL);
3997
3998         if (host->v4_mode)
3999                 sdhci_do_enable_v4_mode(host);
4000
4001         device_property_read_u64(mmc_dev(host->mmc),
4002                                  "sdhci-caps-mask", &dt_caps_mask);
4003         device_property_read_u64(mmc_dev(host->mmc),
4004                                  "sdhci-caps", &dt_caps);
4005
4006         v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
4007         host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
4008
4009         if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
4010                 return;
4011
4012         if (caps) {
4013                 host->caps = *caps;
4014         } else {
4015                 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
4016                 host->caps &= ~lower_32_bits(dt_caps_mask);
4017                 host->caps |= lower_32_bits(dt_caps);
4018         }
4019
4020         if (host->version < SDHCI_SPEC_300)
4021                 return;
4022
4023         if (caps1) {
4024                 host->caps1 = *caps1;
4025         } else {
4026                 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
4027                 host->caps1 &= ~upper_32_bits(dt_caps_mask);
4028                 host->caps1 |= upper_32_bits(dt_caps);
4029         }
4030 }
4031 EXPORT_SYMBOL_GPL(__sdhci_read_caps);
4032
4033 static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
4034 {
4035         struct mmc_host *mmc = host->mmc;
4036         unsigned int max_blocks;
4037         unsigned int bounce_size;
4038         int ret;
4039
4040         /*
4041          * Cap the bounce buffer at 64KB. Using a bigger bounce buffer
4042          * has diminishing returns, this is probably because SD/MMC
4043          * cards are usually optimized to handle this size of requests.
4044          */
4045         bounce_size = SZ_64K;
4046         /*
4047          * Adjust downwards to maximum request size if this is less
4048          * than our segment size, else hammer down the maximum
4049          * request size to the maximum buffer size.
4050          */
4051         if (mmc->max_req_size < bounce_size)
4052                 bounce_size = mmc->max_req_size;
4053         max_blocks = bounce_size / 512;
4054
4055         /*
4056          * When we just support one segment, we can get significant
4057          * speedups by the help of a bounce buffer to group scattered
4058          * reads/writes together.
4059          */
4060         host->bounce_buffer = devm_kmalloc(mmc_dev(mmc),
4061                                            bounce_size,
4062                                            GFP_KERNEL);
4063         if (!host->bounce_buffer) {
4064                 pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n",
4065                        mmc_hostname(mmc),
4066                        bounce_size);
4067                 /*
4068                  * Exiting with zero here makes sure we proceed with
4069                  * mmc->max_segs == 1.
4070                  */
4071                 return;
4072         }
4073
4074         host->bounce_addr = dma_map_single(mmc_dev(mmc),
4075                                            host->bounce_buffer,
4076                                            bounce_size,
4077                                            DMA_BIDIRECTIONAL);
4078         ret = dma_mapping_error(mmc_dev(mmc), host->bounce_addr);
4079         if (ret) {
4080                 devm_kfree(mmc_dev(mmc), host->bounce_buffer);
4081                 host->bounce_buffer = NULL;
4082                 /* Again fall back to max_segs == 1 */
4083                 return;
4084         }
4085
4086         host->bounce_buffer_size = bounce_size;
4087
4088         /* Lie about this since we're bouncing */
4089         mmc->max_segs = max_blocks;
4090         mmc->max_seg_size = bounce_size;
4091         mmc->max_req_size = bounce_size;
4092
4093         pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
4094                 mmc_hostname(mmc), max_blocks, bounce_size);
4095 }
4096
4097 static inline bool sdhci_can_64bit_dma(struct sdhci_host *host)
4098 {
4099         /*
4100          * According to SD Host Controller spec v4.10, bit[27] added from
4101          * version 4.10 in Capabilities Register is used as 64-bit System
4102          * Address support for V4 mode.
4103          */
4104         if (host->version >= SDHCI_SPEC_410 && host->v4_mode)
4105                 return host->caps & SDHCI_CAN_64BIT_V4;
4106
4107         return host->caps & SDHCI_CAN_64BIT;
4108 }
4109
4110 int sdhci_setup_host(struct sdhci_host *host)
4111 {
4112         struct mmc_host *mmc;
4113         u32 max_current_caps;
4114         unsigned int ocr_avail;
4115         unsigned int override_timeout_clk;
4116         u32 max_clk;
4117         int ret = 0;
4118         bool enable_vqmmc = false;
4119
4120         WARN_ON(host == NULL);
4121         if (host == NULL)
4122                 return -EINVAL;
4123
4124         mmc = host->mmc;
4125
4126         /*
4127          * If there are external regulators, get them. Note this must be done
4128          * early before resetting the host and reading the capabilities so that
4129          * the host can take the appropriate action if regulators are not
4130          * available.
4131          */
4132         if (!mmc->supply.vqmmc) {
4133                 ret = mmc_regulator_get_supply(mmc);
4134                 if (ret)
4135                         return ret;
4136                 enable_vqmmc  = true;
4137         }
4138
4139         DBG("Version:   0x%08x | Present:  0x%08x\n",
4140             sdhci_readw(host, SDHCI_HOST_VERSION),
4141             sdhci_readl(host, SDHCI_PRESENT_STATE));
4142         DBG("Caps:      0x%08x | Caps_1:   0x%08x\n",
4143             sdhci_readl(host, SDHCI_CAPABILITIES),
4144             sdhci_readl(host, SDHCI_CAPABILITIES_1));
4145
4146         sdhci_read_caps(host);
4147
4148         override_timeout_clk = host->timeout_clk;
4149
4150         if (host->version > SDHCI_SPEC_420) {
4151                 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
4152                        mmc_hostname(mmc), host->version);
4153         }
4154
4155         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
4156                 host->flags |= SDHCI_USE_SDMA;
4157         else if (!(host->caps & SDHCI_CAN_DO_SDMA))
4158                 DBG("Controller doesn't have SDMA capability\n");
4159         else
4160                 host->flags |= SDHCI_USE_SDMA;
4161
4162         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
4163                 (host->flags & SDHCI_USE_SDMA)) {
4164                 DBG("Disabling DMA as it is marked broken\n");
4165                 host->flags &= ~SDHCI_USE_SDMA;
4166         }
4167
4168         if ((host->version >= SDHCI_SPEC_200) &&
4169                 (host->caps & SDHCI_CAN_DO_ADMA2))
4170                 host->flags |= SDHCI_USE_ADMA;
4171
4172         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
4173                 (host->flags & SDHCI_USE_ADMA)) {
4174                 DBG("Disabling ADMA as it is marked broken\n");
4175                 host->flags &= ~SDHCI_USE_ADMA;
4176         }
4177
4178         if (sdhci_can_64bit_dma(host))
4179                 host->flags |= SDHCI_USE_64_BIT_DMA;
4180
4181         if (host->use_external_dma) {
4182                 ret = sdhci_external_dma_init(host);
4183                 if (ret == -EPROBE_DEFER)
4184                         goto unreg;
4185                 /*
4186                  * Fall back to use the DMA/PIO integrated in standard SDHCI
4187                  * instead of external DMA devices.
4188                  */
4189                 else if (ret)
4190                         sdhci_switch_external_dma(host, false);
4191                 /* Disable internal DMA sources */
4192                 else
4193                         host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4194         }
4195
4196         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
4197                 if (host->ops->set_dma_mask)
4198                         ret = host->ops->set_dma_mask(host);
4199                 else
4200                         ret = sdhci_set_dma_mask(host);
4201
4202                 if (!ret && host->ops->enable_dma)
4203                         ret = host->ops->enable_dma(host);
4204
4205                 if (ret) {
4206                         pr_warn("%s: No suitable DMA available - falling back to PIO\n",
4207                                 mmc_hostname(mmc));
4208                         host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4209
4210                         ret = 0;
4211                 }
4212         }
4213
4214         /* SDMA does not support 64-bit DMA if v4 mode not set */
4215         if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode)
4216                 host->flags &= ~SDHCI_USE_SDMA;
4217
4218         if (host->flags & SDHCI_USE_ADMA) {
4219                 dma_addr_t dma;
4220                 void *buf;
4221
4222                 if (!(host->flags & SDHCI_USE_64_BIT_DMA))
4223                         host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ;
4224                 else if (!host->alloc_desc_sz)
4225                         host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
4226
4227                 host->desc_sz = host->alloc_desc_sz;
4228                 host->adma_table_sz = host->adma_table_cnt * host->desc_sz;
4229
4230                 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
4231                 /*
4232                  * Use zalloc to zero the reserved high 32-bits of 128-bit
4233                  * descriptors so that they never need to be written.
4234                  */
4235                 buf = dma_alloc_coherent(mmc_dev(mmc),
4236                                          host->align_buffer_sz + host->adma_table_sz,
4237                                          &dma, GFP_KERNEL);
4238                 if (!buf) {
4239                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
4240                                 mmc_hostname(mmc));
4241                         host->flags &= ~SDHCI_USE_ADMA;
4242                 } else if ((dma + host->align_buffer_sz) &
4243                            (SDHCI_ADMA2_DESC_ALIGN - 1)) {
4244                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
4245                                 mmc_hostname(mmc));
4246                         host->flags &= ~SDHCI_USE_ADMA;
4247                         dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4248                                           host->adma_table_sz, buf, dma);
4249                 } else {
4250                         host->align_buffer = buf;
4251                         host->align_addr = dma;
4252
4253                         host->adma_table = buf + host->align_buffer_sz;
4254                         host->adma_addr = dma + host->align_buffer_sz;
4255                 }
4256         }
4257
4258         /*
4259          * If we use DMA, then it's up to the caller to set the DMA
4260          * mask, but PIO does not need the hw shim so we set a new
4261          * mask here in that case.
4262          */
4263         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
4264                 host->dma_mask = DMA_BIT_MASK(64);
4265                 mmc_dev(mmc)->dma_mask = &host->dma_mask;
4266         }
4267
4268         if (host->version >= SDHCI_SPEC_300)
4269                 host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps);
4270         else
4271                 host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps);
4272
4273         host->max_clk *= 1000000;
4274         if (host->max_clk == 0 || host->quirks &
4275                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
4276                 if (!host->ops->get_max_clock) {
4277                         pr_err("%s: Hardware doesn't specify base clock frequency.\n",
4278                                mmc_hostname(mmc));
4279                         ret = -ENODEV;
4280                         goto undma;
4281                 }
4282                 host->max_clk = host->ops->get_max_clock(host);
4283         }
4284
4285         /*
4286          * In case of Host Controller v3.00, find out whether clock
4287          * multiplier is supported.
4288          */
4289         host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1);
4290
4291         /*
4292          * In case the value in Clock Multiplier is 0, then programmable
4293          * clock mode is not supported, otherwise the actual clock
4294          * multiplier is one more than the value of Clock Multiplier
4295          * in the Capabilities Register.
4296          */
4297         if (host->clk_mul)
4298                 host->clk_mul += 1;
4299
4300         /*
4301          * Set host parameters.
4302          */
4303         max_clk = host->max_clk;
4304
4305         if (host->ops->get_min_clock)
4306                 mmc->f_min = host->ops->get_min_clock(host);
4307         else if (host->version >= SDHCI_SPEC_300) {
4308                 if (host->clk_mul)
4309                         max_clk = host->max_clk * host->clk_mul;
4310                 /*
4311                  * Divided Clock Mode minimum clock rate is always less than
4312                  * Programmable Clock Mode minimum clock rate.
4313                  */
4314                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
4315         } else
4316                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
4317
4318         if (!mmc->f_max || mmc->f_max > max_clk)
4319                 mmc->f_max = max_clk;
4320
4321         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
4322                 host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps);
4323
4324                 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
4325                         host->timeout_clk *= 1000;
4326
4327                 if (host->timeout_clk == 0) {
4328                         if (!host->ops->get_timeout_clock) {
4329                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
4330                                         mmc_hostname(mmc));
4331                                 ret = -ENODEV;
4332                                 goto undma;
4333                         }
4334
4335                         host->timeout_clk =
4336                                 DIV_ROUND_UP(host->ops->get_timeout_clock(host),
4337                                              1000);
4338                 }
4339
4340                 if (override_timeout_clk)
4341                         host->timeout_clk = override_timeout_clk;
4342
4343                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
4344                         host->ops->get_max_timeout_count(host) : 1 << 27;
4345                 mmc->max_busy_timeout /= host->timeout_clk;
4346         }
4347
4348         if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT &&
4349             !host->ops->get_max_timeout_count)
4350                 mmc->max_busy_timeout = 0;
4351
4352         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23;
4353         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
4354
4355         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
4356                 host->flags |= SDHCI_AUTO_CMD12;
4357
4358         /*
4359          * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO.
4360          * For v4 mode, SDMA may use Auto-CMD23 as well.
4361          */
4362         if ((host->version >= SDHCI_SPEC_300) &&
4363             ((host->flags & SDHCI_USE_ADMA) ||
4364              !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
4365              !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
4366                 host->flags |= SDHCI_AUTO_CMD23;
4367                 DBG("Auto-CMD23 available\n");
4368         } else {
4369                 DBG("Auto-CMD23 unavailable\n");
4370         }
4371
4372         /*
4373          * A controller may support 8-bit width, but the board itself
4374          * might not have the pins brought out.  Boards that support
4375          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
4376          * their platform code before calling sdhci_add_host(), and we
4377          * won't assume 8-bit width for hosts without that CAP.
4378          */
4379         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
4380                 mmc->caps |= MMC_CAP_4_BIT_DATA;
4381
4382         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
4383                 mmc->caps &= ~MMC_CAP_CMD23;
4384
4385         if (host->caps & SDHCI_CAN_DO_HISPD)
4386                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
4387
4388         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
4389             mmc_card_is_removable(mmc) &&
4390             mmc_gpio_get_cd(mmc) < 0)
4391                 mmc->caps |= MMC_CAP_NEEDS_POLL;
4392
4393         if (!IS_ERR(mmc->supply.vqmmc)) {
4394                 if (enable_vqmmc) {
4395                         ret = regulator_enable(mmc->supply.vqmmc);
4396                         host->sdhci_core_to_disable_vqmmc = !ret;
4397                 }
4398
4399                 /* If vqmmc provides no 1.8V signalling, then there's no UHS */
4400                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
4401                                                     1950000))
4402                         host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
4403                                          SDHCI_SUPPORT_SDR50 |
4404                                          SDHCI_SUPPORT_DDR50);
4405
4406                 /* In eMMC case vqmmc might be a fixed 1.8V regulator */
4407                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
4408                                                     3600000))
4409                         host->flags &= ~SDHCI_SIGNALING_330;
4410
4411                 if (ret) {
4412                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
4413                                 mmc_hostname(mmc), ret);
4414                         mmc->supply.vqmmc = ERR_PTR(-EINVAL);
4415                 }
4416
4417         }
4418
4419         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
4420                 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4421                                  SDHCI_SUPPORT_DDR50);
4422                 /*
4423                  * The SDHCI controller in a SoC might support HS200/HS400
4424                  * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property),
4425                  * but if the board is modeled such that the IO lines are not
4426                  * connected to 1.8v then HS200/HS400 cannot be supported.
4427                  * Disable HS200/HS400 if the board does not have 1.8v connected
4428                  * to the IO lines. (Applicable for other modes in 1.8v)
4429                  */
4430                 mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES);
4431                 mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS);
4432         }
4433
4434         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
4435         if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4436                            SDHCI_SUPPORT_DDR50))
4437                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
4438
4439         /* SDR104 supports also implies SDR50 support */
4440         if (host->caps1 & SDHCI_SUPPORT_SDR104) {
4441                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
4442                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
4443                  * field can be promoted to support HS200.
4444                  */
4445                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
4446                         mmc->caps2 |= MMC_CAP2_HS200;
4447         } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
4448                 mmc->caps |= MMC_CAP_UHS_SDR50;
4449         }
4450
4451         if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
4452             (host->caps1 & SDHCI_SUPPORT_HS400))
4453                 mmc->caps2 |= MMC_CAP2_HS400;
4454
4455         if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
4456             (IS_ERR(mmc->supply.vqmmc) ||
4457              !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
4458                                              1300000)))
4459                 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
4460
4461         if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
4462             !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
4463                 mmc->caps |= MMC_CAP_UHS_DDR50;
4464
4465         /* Does the host need tuning for SDR50? */
4466         if (host->caps1 & SDHCI_USE_SDR50_TUNING)
4467                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
4468
4469         /* Driver Type(s) (A, C, D) supported by the host */
4470         if (host->caps1 & SDHCI_DRIVER_TYPE_A)
4471                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
4472         if (host->caps1 & SDHCI_DRIVER_TYPE_C)
4473                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
4474         if (host->caps1 & SDHCI_DRIVER_TYPE_D)
4475                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
4476
4477         /* Initial value for re-tuning timer count */
4478         host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK,
4479                                        host->caps1);
4480
4481         /*
4482          * In case Re-tuning Timer is not disabled, the actual value of
4483          * re-tuning timer will be 2 ^ (n - 1).
4484          */
4485         if (host->tuning_count)
4486                 host->tuning_count = 1 << (host->tuning_count - 1);
4487
4488         /* Re-tuning mode supported by the Host Controller */
4489         host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1);
4490
4491         ocr_avail = 0;
4492
4493         /*
4494          * According to SD Host Controller spec v3.00, if the Host System
4495          * can afford more than 150mA, Host Driver should set XPC to 1. Also
4496          * the value is meaningful only if Voltage Support in the Capabilities
4497          * register is set. The actual current value is 4 times the register
4498          * value.
4499          */
4500         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
4501         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
4502                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
4503                 if (curr > 0) {
4504
4505                         /* convert to SDHCI_MAX_CURRENT format */
4506                         curr = curr/1000;  /* convert to mA */
4507                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
4508
4509                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
4510                         max_current_caps =
4511                                 FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, curr) |
4512                                 FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, curr) |
4513                                 FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, curr);
4514                 }
4515         }
4516
4517         if (host->caps & SDHCI_CAN_VDD_330) {
4518                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
4519
4520                 mmc->max_current_330 = FIELD_GET(SDHCI_MAX_CURRENT_330_MASK,
4521                                                  max_current_caps) *
4522                                                 SDHCI_MAX_CURRENT_MULTIPLIER;
4523         }
4524         if (host->caps & SDHCI_CAN_VDD_300) {
4525                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
4526
4527                 mmc->max_current_300 = FIELD_GET(SDHCI_MAX_CURRENT_300_MASK,
4528                                                  max_current_caps) *
4529                                                 SDHCI_MAX_CURRENT_MULTIPLIER;
4530         }
4531         if (host->caps & SDHCI_CAN_VDD_180) {
4532                 ocr_avail |= MMC_VDD_165_195;
4533
4534                 mmc->max_current_180 = FIELD_GET(SDHCI_MAX_CURRENT_180_MASK,
4535                                                  max_current_caps) *
4536                                                 SDHCI_MAX_CURRENT_MULTIPLIER;
4537         }
4538
4539         /* If OCR set by host, use it instead. */
4540         if (host->ocr_mask)
4541                 ocr_avail = host->ocr_mask;
4542
4543         /* If OCR set by external regulators, give it highest prio. */
4544         if (mmc->ocr_avail)
4545                 ocr_avail = mmc->ocr_avail;
4546
4547         mmc->ocr_avail = ocr_avail;
4548         mmc->ocr_avail_sdio = ocr_avail;
4549         if (host->ocr_avail_sdio)
4550                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
4551         mmc->ocr_avail_sd = ocr_avail;
4552         if (host->ocr_avail_sd)
4553                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
4554         else /* normal SD controllers don't support 1.8V */
4555                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
4556         mmc->ocr_avail_mmc = ocr_avail;
4557         if (host->ocr_avail_mmc)
4558                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
4559
4560         if (mmc->ocr_avail == 0) {
4561                 pr_err("%s: Hardware doesn't report any support voltages.\n",
4562                        mmc_hostname(mmc));
4563                 ret = -ENODEV;
4564                 goto unreg;
4565         }
4566
4567         if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
4568                           MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
4569                           MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
4570             (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
4571                 host->flags |= SDHCI_SIGNALING_180;
4572
4573         if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
4574                 host->flags |= SDHCI_SIGNALING_120;
4575
4576         spin_lock_init(&host->lock);
4577
4578         /*
4579          * Maximum number of sectors in one transfer. Limited by SDMA boundary
4580          * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
4581          * is less anyway.
4582          */
4583         mmc->max_req_size = 524288;
4584
4585         /*
4586          * Maximum number of segments. Depends on if the hardware
4587          * can do scatter/gather or not.
4588          */
4589         if (host->flags & SDHCI_USE_ADMA) {
4590                 mmc->max_segs = SDHCI_MAX_SEGS;
4591         } else if (host->flags & SDHCI_USE_SDMA) {
4592                 mmc->max_segs = 1;
4593                 mmc->max_req_size = min_t(size_t, mmc->max_req_size,
4594                                           dma_max_mapping_size(mmc_dev(mmc)));
4595         } else { /* PIO */
4596                 mmc->max_segs = SDHCI_MAX_SEGS;
4597         }
4598
4599         /*
4600          * Maximum segment size. Could be one segment with the maximum number
4601          * of bytes. When doing hardware scatter/gather, each entry cannot
4602          * be larger than 64 KiB though.
4603          */
4604         if (host->flags & SDHCI_USE_ADMA) {
4605                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
4606                         mmc->max_seg_size = 65535;
4607                 else
4608                         mmc->max_seg_size = 65536;
4609         } else {
4610                 mmc->max_seg_size = mmc->max_req_size;
4611         }
4612
4613         /*
4614          * Maximum block size. This varies from controller to controller and
4615          * is specified in the capabilities register.
4616          */
4617         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
4618                 mmc->max_blk_size = 2;
4619         } else {
4620                 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
4621                                 SDHCI_MAX_BLOCK_SHIFT;
4622                 if (mmc->max_blk_size >= 3) {
4623                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
4624                                 mmc_hostname(mmc));
4625                         mmc->max_blk_size = 0;
4626                 }
4627         }
4628
4629         mmc->max_blk_size = 512 << mmc->max_blk_size;
4630
4631         /*
4632          * Maximum block count.
4633          */
4634         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
4635
4636         if (mmc->max_segs == 1)
4637                 /* This may alter mmc->*_blk_* parameters */
4638                 sdhci_allocate_bounce_buffer(host);
4639
4640         return 0;
4641
4642 unreg:
4643         if (host->sdhci_core_to_disable_vqmmc)
4644                 regulator_disable(mmc->supply.vqmmc);
4645 undma:
4646         if (host->align_buffer)
4647                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4648                                   host->adma_table_sz, host->align_buffer,
4649                                   host->align_addr);
4650         host->adma_table = NULL;
4651         host->align_buffer = NULL;
4652
4653         return ret;
4654 }
4655 EXPORT_SYMBOL_GPL(sdhci_setup_host);
4656
4657 void sdhci_cleanup_host(struct sdhci_host *host)
4658 {
4659         struct mmc_host *mmc = host->mmc;
4660
4661         if (host->sdhci_core_to_disable_vqmmc)
4662                 regulator_disable(mmc->supply.vqmmc);
4663
4664         if (host->align_buffer)
4665                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4666                                   host->adma_table_sz, host->align_buffer,
4667                                   host->align_addr);
4668
4669         if (host->use_external_dma)
4670                 sdhci_external_dma_release(host);
4671
4672         host->adma_table = NULL;
4673         host->align_buffer = NULL;
4674 }
4675 EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
4676
4677 int __sdhci_add_host(struct sdhci_host *host)
4678 {
4679         unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
4680         struct mmc_host *mmc = host->mmc;
4681         int ret;
4682
4683         if ((mmc->caps2 & MMC_CAP2_CQE) &&
4684             (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) {
4685                 mmc->caps2 &= ~MMC_CAP2_CQE;
4686                 mmc->cqe_ops = NULL;
4687         }
4688
4689         host->complete_wq = alloc_workqueue("sdhci", flags, 0);
4690         if (!host->complete_wq)
4691                 return -ENOMEM;
4692
4693         INIT_WORK(&host->complete_work, sdhci_complete_work);
4694
4695         timer_setup(&host->timer, sdhci_timeout_timer, 0);
4696         timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
4697
4698         init_waitqueue_head(&host->buf_ready_int);
4699
4700         sdhci_init(host, 0);
4701
4702         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
4703                                    IRQF_SHARED, mmc_hostname(mmc), host);
4704         if (ret) {
4705                 pr_err("%s: Failed to request IRQ %d: %d\n",
4706                        mmc_hostname(mmc), host->irq, ret);
4707                 goto unwq;
4708         }
4709
4710         ret = sdhci_led_register(host);
4711         if (ret) {
4712                 pr_err("%s: Failed to register LED device: %d\n",
4713                        mmc_hostname(mmc), ret);
4714                 goto unirq;
4715         }
4716
4717         ret = mmc_add_host(mmc);
4718         if (ret)
4719                 goto unled;
4720
4721         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
4722                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
4723                 host->use_external_dma ? "External DMA" :
4724                 (host->flags & SDHCI_USE_ADMA) ?
4725                 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
4726                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
4727
4728         sdhci_enable_card_detection(host);
4729
4730         return 0;
4731
4732 unled:
4733         sdhci_led_unregister(host);
4734 unirq:
4735         sdhci_do_reset(host, SDHCI_RESET_ALL);
4736         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4737         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4738         free_irq(host->irq, host);
4739 unwq:
4740         destroy_workqueue(host->complete_wq);
4741
4742         return ret;
4743 }
4744 EXPORT_SYMBOL_GPL(__sdhci_add_host);
4745
4746 int sdhci_add_host(struct sdhci_host *host)
4747 {
4748         int ret;
4749
4750         ret = sdhci_setup_host(host);
4751         if (ret)
4752                 return ret;
4753
4754         ret = __sdhci_add_host(host);
4755         if (ret)
4756                 goto cleanup;
4757
4758         return 0;
4759
4760 cleanup:
4761         sdhci_cleanup_host(host);
4762
4763         return ret;
4764 }
4765 EXPORT_SYMBOL_GPL(sdhci_add_host);
4766
4767 void sdhci_remove_host(struct sdhci_host *host, int dead)
4768 {
4769         struct mmc_host *mmc = host->mmc;
4770         unsigned long flags;
4771
4772         if (dead) {
4773                 spin_lock_irqsave(&host->lock, flags);
4774
4775                 host->flags |= SDHCI_DEVICE_DEAD;
4776
4777                 if (sdhci_has_requests(host)) {
4778                         pr_err("%s: Controller removed during "
4779                                 " transfer!\n", mmc_hostname(mmc));
4780                         sdhci_error_out_mrqs(host, -ENOMEDIUM);
4781                 }
4782
4783                 spin_unlock_irqrestore(&host->lock, flags);
4784         }
4785
4786         sdhci_disable_card_detection(host);
4787
4788         mmc_remove_host(mmc);
4789
4790         sdhci_led_unregister(host);
4791
4792         if (!dead)
4793                 sdhci_do_reset(host, SDHCI_RESET_ALL);
4794
4795         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4796         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4797         free_irq(host->irq, host);
4798
4799         del_timer_sync(&host->timer);
4800         del_timer_sync(&host->data_timer);
4801
4802         destroy_workqueue(host->complete_wq);
4803
4804         if (host->sdhci_core_to_disable_vqmmc)
4805                 regulator_disable(mmc->supply.vqmmc);
4806
4807         if (host->align_buffer)
4808                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4809                                   host->adma_table_sz, host->align_buffer,
4810                                   host->align_addr);
4811
4812         if (host->use_external_dma)
4813                 sdhci_external_dma_release(host);
4814
4815         host->adma_table = NULL;
4816         host->align_buffer = NULL;
4817 }
4818
4819 EXPORT_SYMBOL_GPL(sdhci_remove_host);
4820
4821 void sdhci_free_host(struct sdhci_host *host)
4822 {
4823         mmc_free_host(host->mmc);
4824 }
4825
4826 EXPORT_SYMBOL_GPL(sdhci_free_host);
4827
4828 /*****************************************************************************\
4829  *                                                                           *
4830  * Driver init/exit                                                          *
4831  *                                                                           *
4832 \*****************************************************************************/
4833
4834 static int __init sdhci_drv_init(void)
4835 {
4836         pr_info(DRIVER_NAME
4837                 ": Secure Digital Host Controller Interface driver\n");
4838         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
4839
4840         return 0;
4841 }
4842
4843 static void __exit sdhci_drv_exit(void)
4844 {
4845 }
4846
4847 module_init(sdhci_drv_init);
4848 module_exit(sdhci_drv_exit);
4849
4850 module_param(debug_quirks, uint, 0444);
4851 module_param(debug_quirks2, uint, 0444);
4852
4853 MODULE_AUTHOR("Pierre Ossman <[email protected]>");
4854 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
4855 MODULE_LICENSE("GPL");
4856
4857 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
4858 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");