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/delay.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/ktime.h>
  15 #include <linux/highmem.h>
  16 #include <linux/io.h>
  17 #include <linux/module.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/slab.h>
  20 #include <linux/scatterlist.h>
  21 #include <linux/sizes.h>
  22 #include <linux/swiotlb.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_finish_data(struct sdhci_host *);
  51
  52 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
  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         SDHCI_DUMP("============================================\n");
 114 }
 115 EXPORT_SYMBOL_GPL(sdhci_dumpregs);
 116
 117 /*****************************************************************************\
 118  *                                                                           *
 119  * Low level functions                                                       *
 120  *                                                                           *
 121 \*****************************************************************************/
 122
 123 static void sdhci_do_enable_v4_mode(struct sdhci_host *host)
 124 {
 125         u16 ctrl2;
 126
 127         ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 128         if (ctrl2 & SDHCI_CTRL_V4_MODE)
 129                 return;
 130
 131         ctrl2 |= SDHCI_CTRL_V4_MODE;
 132         sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
 133 }
 134
 135 /*
 136  * This can be called before sdhci_add_host() by Vendor's host controller
 137  * driver to enable v4 mode if supported.
 138  */
 139 void sdhci_enable_v4_mode(struct sdhci_host *host)
 140 {
 141         host->v4_mode = true;
 142         sdhci_do_enable_v4_mode(host);
 143 }
 144 EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode);
 145
 146 static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
 147 {
 148         return cmd->data || cmd->flags & MMC_RSP_BUSY;
 149 }
 150
 151 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
 152 {
 153         u32 present;
 154
 155         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
 156             !mmc_card_is_removable(host->mmc))
 157                 return;
 158
 159         if (enable) {
 160                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
 161                                       SDHCI_CARD_PRESENT;
 162
 163                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
 164                                        SDHCI_INT_CARD_INSERT;
 165         } else {
 166                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
 167         }
 168
 169         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 170         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 171 }
 172
 173 static void sdhci_enable_card_detection(struct sdhci_host *host)
 174 {
 175         sdhci_set_card_detection(host, true);
 176 }
 177
 178 static void sdhci_disable_card_detection(struct sdhci_host *host)
 179 {
 180         sdhci_set_card_detection(host, false);
 181 }
 182
 183 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 184 {
 185         if (host->bus_on)
 186                 return;
 187         host->bus_on = true;
 188         pm_runtime_get_noresume(host->mmc->parent);
 189 }
 190
 191 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 192 {
 193         if (!host->bus_on)
 194                 return;
 195         host->bus_on = false;
 196         pm_runtime_put_noidle(host->mmc->parent);
 197 }
 198
 199 void sdhci_reset(struct sdhci_host *host, u8 mask)
 200 {
 201         ktime_t timeout;
 202
 203         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 204
 205         if (mask & SDHCI_RESET_ALL) {
 206                 host->clock = 0;
 207                 /* Reset-all turns off SD Bus Power */
 208                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
 209                         sdhci_runtime_pm_bus_off(host);
 210         }
 211
 212         /* Wait max 100 ms */
 213         timeout = ktime_add_ms(ktime_get(), 100);
 214
 215         /* hw clears the bit when it's done */
 216         while (1) {
 217                 bool timedout = ktime_after(ktime_get(), timeout);
 218
 219                 if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
 220                         break;
 221                 if (timedout) {
 222                         pr_err("%s: Reset 0x%x never completed.\n",
 223                                 mmc_hostname(host->mmc), (int)mask);
 224                         sdhci_dumpregs(host);
 225                         return;
 226                 }
 227                 udelay(10);
 228         }
 229 }
 230 EXPORT_SYMBOL_GPL(sdhci_reset);
 231
 232 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
 233 {
 234         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
 235                 struct mmc_host *mmc = host->mmc;
 236
 237                 if (!mmc->ops->get_cd(mmc))
 238                         return;
 239         }
 240
 241         host->ops->reset(host, mask);
 242
 243         if (mask & SDHCI_RESET_ALL) {
 244                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 245                         if (host->ops->enable_dma)
 246                                 host->ops->enable_dma(host);
 247                 }
 248
 249                 /* Resetting the controller clears many */
 250                 host->preset_enabled = false;
 251         }
 252 }
 253
 254 static void sdhci_set_default_irqs(struct sdhci_host *host)
 255 {
 256         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
 257                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
 258                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
 259                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
 260                     SDHCI_INT_RESPONSE;
 261
 262         if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
 263             host->tuning_mode == SDHCI_TUNING_MODE_3)
 264                 host->ier |= SDHCI_INT_RETUNE;
 265
 266         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 267         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 268 }
 269
 270 static void sdhci_config_dma(struct sdhci_host *host)
 271 {
 272         u8 ctrl;
 273         u16 ctrl2;
 274
 275         if (host->version < SDHCI_SPEC_200)
 276                 return;
 277
 278         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 279
 280         /*
 281          * Always adjust the DMA selection as some controllers
 282          * (e.g. JMicron) can't do PIO properly when the selection
 283          * is ADMA.
 284          */
 285         ctrl &= ~SDHCI_CTRL_DMA_MASK;
 286         if (!(host->flags & SDHCI_REQ_USE_DMA))
 287                 goto out;
 288
 289         /* Note if DMA Select is zero then SDMA is selected */
 290         if (host->flags & SDHCI_USE_ADMA)
 291                 ctrl |= SDHCI_CTRL_ADMA32;
 292
 293         if (host->flags & SDHCI_USE_64_BIT_DMA) {
 294                 /*
 295                  * If v4 mode, all supported DMA can be 64-bit addressing if
 296                  * controller supports 64-bit system address, otherwise only
 297                  * ADMA can support 64-bit addressing.
 298                  */
 299                 if (host->v4_mode) {
 300                         ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 301                         ctrl2 |= SDHCI_CTRL_64BIT_ADDR;
 302                         sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
 303                 } else if (host->flags & SDHCI_USE_ADMA) {
 304                         /*
 305                          * Don't need to undo SDHCI_CTRL_ADMA32 in order to
 306                          * set SDHCI_CTRL_ADMA64.
 307                          */
 308                         ctrl |= SDHCI_CTRL_ADMA64;
 309                 }
 310         }
 311
 312 out:
 313         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 314 }
 315
 316 static void sdhci_init(struct sdhci_host *host, int soft)
 317 {
 318         struct mmc_host *mmc = host->mmc;
 319
 320         if (soft)
 321                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
 322         else
 323                 sdhci_do_reset(host, SDHCI_RESET_ALL);
 324
 325         if (host->v4_mode)
 326                 sdhci_do_enable_v4_mode(host);
 327
 328         sdhci_set_default_irqs(host);
 329
 330         host->cqe_on = false;
 331
 332         if (soft) {
 333                 /* force clock reconfiguration */
 334                 host->clock = 0;
 335                 mmc->ops->set_ios(mmc, &mmc->ios);
 336         }
 337 }
 338
 339 static void sdhci_reinit(struct sdhci_host *host)
 340 {
 341         u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
 342
 343         sdhci_init(host, 0);
 344         sdhci_enable_card_detection(host);
 345
 346         /*
 347          * A change to the card detect bits indicates a change in present state,
 348          * refer sdhci_set_card_detection(). A card detect interrupt might have
 349          * been missed while the host controller was being reset, so trigger a
 350          * rescan to check.
 351          */
 352         if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT)))
 353                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
 354 }
 355
 356 static void __sdhci_led_activate(struct sdhci_host *host)
 357 {
 358         u8 ctrl;
 359
 360         if (host->quirks & SDHCI_QUIRK_NO_LED)
 361                 return;
 362
 363         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 364         ctrl |= SDHCI_CTRL_LED;
 365         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 366 }
 367
 368 static void __sdhci_led_deactivate(struct sdhci_host *host)
 369 {
 370         u8 ctrl;
 371
 372         if (host->quirks & SDHCI_QUIRK_NO_LED)
 373                 return;
 374
 375         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 376         ctrl &= ~SDHCI_CTRL_LED;
 377         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 378 }
 379
 380 #if IS_REACHABLE(CONFIG_LEDS_CLASS)
 381 static void sdhci_led_control(struct led_classdev *led,
 382                               enum led_brightness brightness)
 383 {
 384         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
 385         unsigned long flags;
 386
 387         spin_lock_irqsave(&host->lock, flags);
 388
 389         if (host->runtime_suspended)
 390                 goto out;
 391
 392         if (brightness == LED_OFF)
 393                 __sdhci_led_deactivate(host);
 394         else
 395                 __sdhci_led_activate(host);
 396 out:
 397         spin_unlock_irqrestore(&host->lock, flags);
 398 }
 399
 400 static int sdhci_led_register(struct sdhci_host *host)
 401 {
 402         struct mmc_host *mmc = host->mmc;
 403
 404         if (host->quirks & SDHCI_QUIRK_NO_LED)
 405                 return 0;
 406
 407         snprintf(host->led_name, sizeof(host->led_name),
 408                  "%s::", mmc_hostname(mmc));
 409
 410         host->led.name = host->led_name;
 411         host->led.brightness = LED_OFF;
 412         host->led.default_trigger = mmc_hostname(mmc);
 413         host->led.brightness_set = sdhci_led_control;
 414
 415         return led_classdev_register(mmc_dev(mmc), &host->led);
 416 }
 417
 418 static void sdhci_led_unregister(struct sdhci_host *host)
 419 {
 420         if (host->quirks & SDHCI_QUIRK_NO_LED)
 421                 return;
 422
 423         led_classdev_unregister(&host->led);
 424 }
 425
 426 static inline void sdhci_led_activate(struct sdhci_host *host)
 427 {
 428 }
 429
 430 static inline void sdhci_led_deactivate(struct sdhci_host *host)
 431 {
 432 }
 433
 434 #else
 435
 436 static inline int sdhci_led_register(struct sdhci_host *host)
 437 {
 438         return 0;
 439 }
 440
 441 static inline void sdhci_led_unregister(struct sdhci_host *host)
 442 {
 443 }
 444
 445 static inline void sdhci_led_activate(struct sdhci_host *host)
 446 {
 447         __sdhci_led_activate(host);
 448 }
 449
 450 static inline void sdhci_led_deactivate(struct sdhci_host *host)
 451 {
 452         __sdhci_led_deactivate(host);
 453 }
 454
 455 #endif
 456
 457 static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
 458                             unsigned long timeout)
 459 {
 460         if (sdhci_data_line_cmd(mrq->cmd))
 461                 mod_timer(&host->data_timer, timeout);
 462         else
 463                 mod_timer(&host->timer, timeout);
 464 }
 465
 466 static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
 467 {
 468         if (sdhci_data_line_cmd(mrq->cmd))
 469                 del_timer(&host->data_timer);
 470         else
 471                 del_timer(&host->timer);
 472 }
 473
 474 static inline bool sdhci_has_requests(struct sdhci_host *host)
 475 {
 476         return host->cmd || host->data_cmd;
 477 }
 478
 479 /*****************************************************************************\
 480  *                                                                           *
 481  * Core functions                                                            *
 482  *                                                                           *
 483 \*****************************************************************************/
 484
 485 static void sdhci_read_block_pio(struct sdhci_host *host)
 486 {
 487         unsigned long flags;
 488         size_t blksize, len, chunk;
 489         u32 uninitialized_var(scratch);
 490         u8 *buf;
 491
 492         DBG("PIO reading\n");
 493
 494         blksize = host->data->blksz;
 495         chunk = 0;
 496
 497         local_irq_save(flags);
 498
 499         while (blksize) {
 500                 BUG_ON(!sg_miter_next(&host->sg_miter));
 501
 502                 len = min(host->sg_miter.length, blksize);
 503
 504                 blksize -= len;
 505                 host->sg_miter.consumed = len;
 506
 507                 buf = host->sg_miter.addr;
 508
 509                 while (len) {
 510                         if (chunk == 0) {
 511                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
 512                                 chunk = 4;
 513                         }
 514
 515                         *buf = scratch & 0xFF;
 516
 517                         buf++;
 518                         scratch >>= 8;
 519                         chunk--;
 520                         len--;
 521                 }
 522         }
 523
 524         sg_miter_stop(&host->sg_miter);
 525
 526         local_irq_restore(flags);
 527 }
 528
 529 static void sdhci_write_block_pio(struct sdhci_host *host)
 530 {
 531         unsigned long flags;
 532         size_t blksize, len, chunk;
 533         u32 scratch;
 534         u8 *buf;
 535
 536         DBG("PIO writing\n");
 537
 538         blksize = host->data->blksz;
 539         chunk = 0;
 540         scratch = 0;
 541
 542         local_irq_save(flags);
 543
 544         while (blksize) {
 545                 BUG_ON(!sg_miter_next(&host->sg_miter));
 546
 547                 len = min(host->sg_miter.length, blksize);
 548
 549                 blksize -= len;
 550                 host->sg_miter.consumed = len;
 551
 552                 buf = host->sg_miter.addr;
 553
 554                 while (len) {
 555                         scratch |= (u32)*buf << (chunk * 8);
 556
 557                         buf++;
 558                         chunk++;
 559                         len--;
 560
 561                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
 562                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
 563                                 chunk = 0;
 564                                 scratch = 0;
 565                         }
 566                 }
 567         }
 568
 569         sg_miter_stop(&host->sg_miter);
 570
 571         local_irq_restore(flags);
 572 }
 573
 574 static void sdhci_transfer_pio(struct sdhci_host *host)
 575 {
 576         u32 mask;
 577
 578         if (host->blocks == 0)
 579                 return;
 580
 581         if (host->data->flags & MMC_DATA_READ)
 582                 mask = SDHCI_DATA_AVAILABLE;
 583         else
 584                 mask = SDHCI_SPACE_AVAILABLE;
 585
 586         /*
 587          * Some controllers (JMicron JMB38x) mess up the buffer bits
 588          * for transfers < 4 bytes. As long as it is just one block,
 589          * we can ignore the bits.
 590          */
 591         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
 592                 (host->data->blocks == 1))
 593                 mask = ~0;
 594
 595         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 596                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
 597                         udelay(100);
 598
 599                 if (host->data->flags & MMC_DATA_READ)
 600                         sdhci_read_block_pio(host);
 601                 else
 602                         sdhci_write_block_pio(host);
 603
 604                 host->blocks--;
 605                 if (host->blocks == 0)
 606                         break;
 607         }
 608
 609         DBG("PIO transfer complete.\n");
 610 }
 611
 612 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
 613                                   struct mmc_data *data, int cookie)
 614 {
 615         int sg_count;
 616
 617         /*
 618          * If the data buffers are already mapped, return the previous
 619          * dma_map_sg() result.
 620          */
 621         if (data->host_cookie == COOKIE_PRE_MAPPED)
 622                 return data->sg_count;
 623
 624         /* Bounce write requests to the bounce buffer */
 625         if (host->bounce_buffer) {
 626                 unsigned int length = data->blksz * data->blocks;
 627
 628                 if (length > host->bounce_buffer_size) {
 629                         pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n",
 630                                mmc_hostname(host->mmc), length,
 631                                host->bounce_buffer_size);
 632                         return -EIO;
 633                 }
 634                 if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
 635                         /* Copy the data to the bounce buffer */
 636                         sg_copy_to_buffer(data->sg, data->sg_len,
 637                                           host->bounce_buffer,
 638                                           length);
 639                 }
 640                 /* Switch ownership to the DMA */
 641                 dma_sync_single_for_device(host->mmc->parent,
 642                                            host->bounce_addr,
 643                                            host->bounce_buffer_size,
 644                                            mmc_get_dma_dir(data));
 645                 /* Just a dummy value */
 646                 sg_count = 1;
 647         } else {
 648                 /* Just access the data directly from memory */
 649                 sg_count = dma_map_sg(mmc_dev(host->mmc),
 650                                       data->sg, data->sg_len,
 651                                       mmc_get_dma_dir(data));
 652         }
 653
 654         if (sg_count == 0)
 655                 return -ENOSPC;
 656
 657         data->sg_count = sg_count;
 658         data->host_cookie = cookie;
 659
 660         return sg_count;
 661 }
 662
 663 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 664 {
 665         local_irq_save(*flags);
 666         return kmap_atomic(sg_page(sg)) + sg->offset;
 667 }
 668
 669 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
 670 {
 671         kunmap_atomic(buffer);
 672         local_irq_restore(*flags);
 673 }
 674
 675 void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
 676                            dma_addr_t addr, int len, unsigned int cmd)
 677 {
 678         struct sdhci_adma2_64_desc *dma_desc = *desc;
 679
 680         /* 32-bit and 64-bit descriptors have these members in same position */
 681         dma_desc->cmd = cpu_to_le16(cmd);
 682         dma_desc->len = cpu_to_le16(len);
 683         dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr));
 684
 685         if (host->flags & SDHCI_USE_64_BIT_DMA)
 686                 dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr));
 687
 688         *desc += host->desc_sz;
 689 }
 690 EXPORT_SYMBOL_GPL(sdhci_adma_write_desc);
 691
 692 static inline void __sdhci_adma_write_desc(struct sdhci_host *host,
 693                                            void **desc, dma_addr_t addr,
 694                                            int len, unsigned int cmd)
 695 {
 696         if (host->ops->adma_write_desc)
 697                 host->ops->adma_write_desc(host, desc, addr, len, cmd);
 698         else
 699                 sdhci_adma_write_desc(host, desc, addr, len, cmd);
 700 }
 701
 702 static void sdhci_adma_mark_end(void *desc)
 703 {
 704         struct sdhci_adma2_64_desc *dma_desc = desc;
 705
 706         /* 32-bit and 64-bit descriptors have 'cmd' in same position */
 707         dma_desc->cmd |= cpu_to_le16(ADMA2_END);
 708 }
 709
 710 static void sdhci_adma_table_pre(struct sdhci_host *host,
 711         struct mmc_data *data, int sg_count)
 712 {
 713         struct scatterlist *sg;
 714         unsigned long flags;
 715         dma_addr_t addr, align_addr;
 716         void *desc, *align;
 717         char *buffer;
 718         int len, offset, i;
 719
 720         /*
 721          * The spec does not specify endianness of descriptor table.
 722          * We currently guess that it is LE.
 723          */
 724
 725         host->sg_count = sg_count;
 726
 727         desc = host->adma_table;
 728         align = host->align_buffer;
 729
 730         align_addr = host->align_addr;
 731
 732         for_each_sg(data->sg, sg, host->sg_count, i) {
 733                 addr = sg_dma_address(sg);
 734                 len = sg_dma_len(sg);
 735
 736                 /*
 737                  * The SDHCI specification states that ADMA addresses must
 738                  * be 32-bit aligned. If they aren't, then we use a bounce
 739                  * buffer for the (up to three) bytes that screw up the
 740                  * alignment.
 741                  */
 742                 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
 743                          SDHCI_ADMA2_MASK;
 744                 if (offset) {
 745                         if (data->flags & MMC_DATA_WRITE) {
 746                                 buffer = sdhci_kmap_atomic(sg, &flags);
 747                                 memcpy(align, buffer, offset);
 748                                 sdhci_kunmap_atomic(buffer, &flags);
 749                         }
 750
 751                         /* tran, valid */
 752                         __sdhci_adma_write_desc(host, &desc, align_addr,
 753                                                 offset, ADMA2_TRAN_VALID);
 754
 755                         BUG_ON(offset > 65536);
 756
 757                         align += SDHCI_ADMA2_ALIGN;
 758                         align_addr += SDHCI_ADMA2_ALIGN;
 759
 760                         addr += offset;
 761                         len -= offset;
 762                 }
 763
 764                 BUG_ON(len > 65536);
 765
 766                 /* tran, valid */
 767                 if (len)
 768                         __sdhci_adma_write_desc(host, &desc, addr, len,
 769                                                 ADMA2_TRAN_VALID);
 770
 771                 /*
 772                  * If this triggers then we have a calculation bug
 773                  * somewhere. :/
 774                  */
 775                 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
 776         }
 777
 778         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
 779                 /* Mark the last descriptor as the terminating descriptor */
 780                 if (desc != host->adma_table) {
 781                         desc -= host->desc_sz;
 782                         sdhci_adma_mark_end(desc);
 783                 }
 784         } else {
 785                 /* Add a terminating entry - nop, end, valid */
 786                 __sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID);
 787         }
 788 }
 789
 790 static void sdhci_adma_table_post(struct sdhci_host *host,
 791         struct mmc_data *data)
 792 {
 793         struct scatterlist *sg;
 794         int i, size;
 795         void *align;
 796         char *buffer;
 797         unsigned long flags;
 798
 799         if (data->flags & MMC_DATA_READ) {
 800                 bool has_unaligned = false;
 801
 802                 /* Do a quick scan of the SG list for any unaligned mappings */
 803                 for_each_sg(data->sg, sg, host->sg_count, i)
 804                         if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 805                                 has_unaligned = true;
 806                                 break;
 807                         }
 808
 809                 if (has_unaligned) {
 810                         dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
 811                                             data->sg_len, DMA_FROM_DEVICE);
 812
 813                         align = host->align_buffer;
 814
 815                         for_each_sg(data->sg, sg, host->sg_count, i) {
 816                                 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 817                                         size = SDHCI_ADMA2_ALIGN -
 818                                                (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
 819
 820                                         buffer = sdhci_kmap_atomic(sg, &flags);
 821                                         memcpy(buffer, align, size);
 822                                         sdhci_kunmap_atomic(buffer, &flags);
 823
 824                                         align += SDHCI_ADMA2_ALIGN;
 825                                 }
 826                         }
 827                 }
 828         }
 829 }
 830
 831 static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr)
 832 {
 833         sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS);
 834         if (host->flags & SDHCI_USE_64_BIT_DMA)
 835                 sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI);
 836 }
 837
 838 static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
 839 {
 840         if (host->bounce_buffer)
 841                 return host->bounce_addr;
 842         else
 843                 return sg_dma_address(host->data->sg);
 844 }
 845
 846 static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
 847 {
 848         if (host->v4_mode)
 849                 sdhci_set_adma_addr(host, addr);
 850         else
 851                 sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
 852 }
 853
 854 static unsigned int sdhci_target_timeout(struct sdhci_host *host,
 855                                          struct mmc_command *cmd,
 856                                          struct mmc_data *data)
 857 {
 858         unsigned int target_timeout;
 859
 860         /* timeout in us */
 861         if (!data) {
 862                 target_timeout = cmd->busy_timeout * 1000;
 863         } else {
 864                 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
 865                 if (host->clock && data->timeout_clks) {
 866                         unsigned long long val;
 867
 868                         /*
 869                          * data->timeout_clks is in units of clock cycles.
 870                          * host->clock is in Hz.  target_timeout is in us.
 871                          * Hence, us = 1000000 * cycles / Hz.  Round up.
 872                          */
 873                         val = 1000000ULL * data->timeout_clks;
 874                         if (do_div(val, host->clock))
 875                                 target_timeout++;
 876                         target_timeout += val;
 877                 }
 878         }
 879
 880         return target_timeout;
 881 }
 882
 883 static void sdhci_calc_sw_timeout(struct sdhci_host *host,
 884                                   struct mmc_command *cmd)
 885 {
 886         struct mmc_data *data = cmd->data;
 887         struct mmc_host *mmc = host->mmc;
 888         struct mmc_ios *ios = &mmc->ios;
 889         unsigned char bus_width = 1 << ios->bus_width;
 890         unsigned int blksz;
 891         unsigned int freq;
 892         u64 target_timeout;
 893         u64 transfer_time;
 894
 895         target_timeout = sdhci_target_timeout(host, cmd, data);
 896         target_timeout *= NSEC_PER_USEC;
 897
 898         if (data) {
 899                 blksz = data->blksz;
 900                 freq = host->mmc->actual_clock ? : host->clock;
 901                 transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width);
 902                 do_div(transfer_time, freq);
 903                 /* multiply by '2' to account for any unknowns */
 904                 transfer_time = transfer_time * 2;
 905                 /* calculate timeout for the entire data */
 906                 host->data_timeout = data->blocks * target_timeout +
 907                                      transfer_time;
 908         } else {
 909                 host->data_timeout = target_timeout;
 910         }
 911
 912         if (host->data_timeout)
 913                 host->data_timeout += MMC_CMD_TRANSFER_TIME;
 914 }
 915
 916 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd,
 917                              bool *too_big)
 918 {
 919         u8 count;
 920         struct mmc_data *data;
 921         unsigned target_timeout, current_timeout;
 922
 923         *too_big = true;
 924
 925         /*
 926          * If the host controller provides us with an incorrect timeout
 927          * value, just skip the check and use 0xE.  The hardware may take
 928          * longer to time out, but that's much better than having a too-short
 929          * timeout value.
 930          */
 931         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
 932                 return 0xE;
 933
 934         /* Unspecified command, asume max */
 935         if (cmd == NULL)
 936                 return 0xE;
 937
 938         data = cmd->data;
 939         /* Unspecified timeout, assume max */
 940         if (!data && !cmd->busy_timeout)
 941                 return 0xE;
 942
 943         /* timeout in us */
 944         target_timeout = sdhci_target_timeout(host, cmd, data);
 945
 946         /*
 947          * Figure out needed cycles.
 948          * We do this in steps in order to fit inside a 32 bit int.
 949          * The first step is the minimum timeout, which will have a
 950          * minimum resolution of 6 bits:
 951          * (1) 2^13*1000 > 2^22,
 952          * (2) host->timeout_clk < 2^16
 953          *     =>
 954          *     (1) / (2) > 2^6
 955          */
 956         count = 0;
 957         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
 958         while (current_timeout < target_timeout) {
 959                 count++;
 960                 current_timeout <<= 1;
 961                 if (count >= 0xF)
 962                         break;
 963         }
 964
 965         if (count >= 0xF) {
 966                 if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT))
 967                         DBG("Too large timeout 0x%x requested for CMD%d!\n",
 968                             count, cmd->opcode);
 969                 count = 0xE;
 970         } else {
 971                 *too_big = false;
 972         }
 973
 974         return count;
 975 }
 976
 977 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
 978 {
 979         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
 980         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
 981
 982         if (host->flags & SDHCI_REQ_USE_DMA)
 983                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
 984         else
 985                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
 986
 987         if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12))
 988                 host->ier |= SDHCI_INT_AUTO_CMD_ERR;
 989         else
 990                 host->ier &= ~SDHCI_INT_AUTO_CMD_ERR;
 991
 992         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
 993         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 994 }
 995
 996 void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable)
 997 {
 998         if (enable)
 999                 host->ier |= SDHCI_INT_DATA_TIMEOUT;
1000         else
1001                 host->ier &= ~SDHCI_INT_DATA_TIMEOUT;
1002         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1003         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1004 }
1005 EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq);
1006
1007 void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1008 {
1009         bool too_big = false;
1010         u8 count = sdhci_calc_timeout(host, cmd, &too_big);
1011
1012         if (too_big &&
1013             host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
1014                 sdhci_calc_sw_timeout(host, cmd);
1015                 sdhci_set_data_timeout_irq(host, false);
1016         } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
1017                 sdhci_set_data_timeout_irq(host, true);
1018         }
1019
1020         sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
1021 }
1022 EXPORT_SYMBOL_GPL(__sdhci_set_timeout);
1023
1024 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1025 {
1026         if (host->ops->set_timeout)
1027                 host->ops->set_timeout(host, cmd);
1028         else
1029                 __sdhci_set_timeout(host, cmd);
1030 }
1031
1032 static void sdhci_initialize_data(struct sdhci_host *host,
1033                                   struct mmc_data *data)
1034 {
1035         WARN_ON(host->data);
1036
1037         /* Sanity checks */
1038         BUG_ON(data->blksz * data->blocks > 524288);
1039         BUG_ON(data->blksz > host->mmc->max_blk_size);
1040         BUG_ON(data->blocks > 65535);
1041
1042         host->data = data;
1043         host->data_early = 0;
1044         host->data->bytes_xfered = 0;
1045 }
1046
1047 static inline void sdhci_set_block_info(struct sdhci_host *host,
1048                                         struct mmc_data *data)
1049 {
1050         /* Set the DMA boundary value and block size */
1051         sdhci_writew(host,
1052                      SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
1053                      SDHCI_BLOCK_SIZE);
1054         /*
1055          * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count
1056          * can be supported, in that case 16-bit block count register must be 0.
1057          */
1058         if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
1059             (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) {
1060                 if (sdhci_readw(host, SDHCI_BLOCK_COUNT))
1061                         sdhci_writew(host, 0, SDHCI_BLOCK_COUNT);
1062                 sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT);
1063         } else {
1064                 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
1065         }
1066 }
1067
1068 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
1069 {
1070         struct mmc_data *data = cmd->data;
1071
1072         sdhci_initialize_data(host, data);
1073
1074         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
1075                 struct scatterlist *sg;
1076                 unsigned int length_mask, offset_mask;
1077                 int i;
1078
1079                 host->flags |= SDHCI_REQ_USE_DMA;
1080
1081                 /*
1082                  * FIXME: This doesn't account for merging when mapping the
1083                  * scatterlist.
1084                  *
1085                  * The assumption here being that alignment and lengths are
1086                  * the same after DMA mapping to device address space.
1087                  */
1088                 length_mask = 0;
1089                 offset_mask = 0;
1090                 if (host->flags & SDHCI_USE_ADMA) {
1091                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
1092                                 length_mask = 3;
1093                                 /*
1094                                  * As we use up to 3 byte chunks to work
1095                                  * around alignment problems, we need to
1096                                  * check the offset as well.
1097                                  */
1098                                 offset_mask = 3;
1099                         }
1100                 } else {
1101                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
1102                                 length_mask = 3;
1103                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
1104                                 offset_mask = 3;
1105                 }
1106
1107                 if (unlikely(length_mask | offset_mask)) {
1108                         for_each_sg(data->sg, sg, data->sg_len, i) {
1109                                 if (sg->length & length_mask) {
1110                                         DBG("Reverting to PIO because of transfer size (%d)\n",
1111                                             sg->length);
1112                                         host->flags &= ~SDHCI_REQ_USE_DMA;
1113                                         break;
1114                                 }
1115                                 if (sg->offset & offset_mask) {
1116                                         DBG("Reverting to PIO because of bad alignment\n");
1117                                         host->flags &= ~SDHCI_REQ_USE_DMA;
1118                                         break;
1119                                 }
1120                         }
1121                 }
1122         }
1123
1124         if (host->flags & SDHCI_REQ_USE_DMA) {
1125                 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1126
1127                 if (sg_cnt <= 0) {
1128                         /*
1129                          * This only happens when someone fed
1130                          * us an invalid request.
1131                          */
1132                         WARN_ON(1);
1133                         host->flags &= ~SDHCI_REQ_USE_DMA;
1134                 } else if (host->flags & SDHCI_USE_ADMA) {
1135                         sdhci_adma_table_pre(host, data, sg_cnt);
1136                         sdhci_set_adma_addr(host, host->adma_addr);
1137                 } else {
1138                         WARN_ON(sg_cnt != 1);
1139                         sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
1140                 }
1141         }
1142
1143         sdhci_config_dma(host);
1144
1145         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
1146                 int flags;
1147
1148                 flags = SG_MITER_ATOMIC;
1149                 if (host->data->flags & MMC_DATA_READ)
1150                         flags |= SG_MITER_TO_SG;
1151                 else
1152                         flags |= SG_MITER_FROM_SG;
1153                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1154                 host->blocks = data->blocks;
1155         }
1156
1157         sdhci_set_transfer_irqs(host);
1158
1159         sdhci_set_block_info(host, data);
1160 }
1161
1162 #if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
1163
1164 static int sdhci_external_dma_init(struct sdhci_host *host)
1165 {
1166         int ret = 0;
1167         struct mmc_host *mmc = host->mmc;
1168
1169         host->tx_chan = dma_request_chan(mmc->parent, "tx");
1170         if (IS_ERR(host->tx_chan)) {
1171                 ret = PTR_ERR(host->tx_chan);
1172                 if (ret != -EPROBE_DEFER)
1173                         pr_warn("Failed to request TX DMA channel.\n");
1174                 host->tx_chan = NULL;
1175                 return ret;
1176         }
1177
1178         host->rx_chan = dma_request_chan(mmc->parent, "rx");
1179         if (IS_ERR(host->rx_chan)) {
1180                 if (host->tx_chan) {
1181                         dma_release_channel(host->tx_chan);
1182                         host->tx_chan = NULL;
1183                 }
1184
1185                 ret = PTR_ERR(host->rx_chan);
1186                 if (ret != -EPROBE_DEFER)
1187                         pr_warn("Failed to request RX DMA channel.\n");
1188                 host->rx_chan = NULL;
1189         }
1190
1191         return ret;
1192 }
1193
1194 static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1195                                                    struct mmc_data *data)
1196 {
1197         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
1198 }
1199
1200 static int sdhci_external_dma_setup(struct sdhci_host *host,
1201                                     struct mmc_command *cmd)
1202 {
1203         int ret, i;
1204         enum dma_transfer_direction dir;
1205         struct dma_async_tx_descriptor *desc;
1206         struct mmc_data *data = cmd->data;
1207         struct dma_chan *chan;
1208         struct dma_slave_config cfg;
1209         dma_cookie_t cookie;
1210         int sg_cnt;
1211
1212         if (!host->mapbase)
1213                 return -EINVAL;
1214
1215         cfg.src_addr = host->mapbase + SDHCI_BUFFER;
1216         cfg.dst_addr = host->mapbase + SDHCI_BUFFER;
1217         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1218         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1219         cfg.src_maxburst = data->blksz / 4;
1220         cfg.dst_maxburst = data->blksz / 4;
1221
1222         /* Sanity check: all the SG entries must be aligned by block size. */
1223         for (i = 0; i < data->sg_len; i++) {
1224                 if ((data->sg + i)->length % data->blksz)
1225                         return -EINVAL;
1226         }
1227
1228         chan = sdhci_external_dma_channel(host, data);
1229
1230         ret = dmaengine_slave_config(chan, &cfg);
1231         if (ret)
1232                 return ret;
1233
1234         sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1235         if (sg_cnt <= 0)
1236                 return -EINVAL;
1237
1238         dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
1239         desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir,
1240                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1241         if (!desc)
1242                 return -EINVAL;
1243
1244         desc->callback = NULL;
1245         desc->callback_param = NULL;
1246
1247         cookie = dmaengine_submit(desc);
1248         if (dma_submit_error(cookie))
1249                 ret = cookie;
1250
1251         return ret;
1252 }
1253
1254 static void sdhci_external_dma_release(struct sdhci_host *host)
1255 {
1256         if (host->tx_chan) {
1257                 dma_release_channel(host->tx_chan);
1258                 host->tx_chan = NULL;
1259         }
1260
1261         if (host->rx_chan) {
1262                 dma_release_channel(host->rx_chan);
1263                 host->rx_chan = NULL;
1264         }
1265
1266         sdhci_switch_external_dma(host, false);
1267 }
1268
1269 static void __sdhci_external_dma_prepare_data(struct sdhci_host *host,
1270                                               struct mmc_command *cmd)
1271 {
1272         struct mmc_data *data = cmd->data;
1273
1274         sdhci_initialize_data(host, data);
1275
1276         host->flags |= SDHCI_REQ_USE_DMA;
1277         sdhci_set_transfer_irqs(host);
1278
1279         sdhci_set_block_info(host, data);
1280 }
1281
1282 static void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1283                                             struct mmc_command *cmd)
1284 {
1285         if (!sdhci_external_dma_setup(host, cmd)) {
1286                 __sdhci_external_dma_prepare_data(host, cmd);
1287         } else {
1288                 sdhci_external_dma_release(host);
1289                 pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n",
1290                        mmc_hostname(host->mmc));
1291                 sdhci_prepare_data(host, cmd);
1292         }
1293 }
1294
1295 static void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1296                                             struct mmc_command *cmd)
1297 {
1298         struct dma_chan *chan;
1299
1300         if (!cmd->data)
1301                 return;
1302
1303         chan = sdhci_external_dma_channel(host, cmd->data);
1304         if (chan)
1305                 dma_async_issue_pending(chan);
1306 }
1307
1308 #else
1309
1310 static inline int sdhci_external_dma_init(struct sdhci_host *host)
1311 {
1312         return -EOPNOTSUPP;
1313 }
1314
1315 static inline void sdhci_external_dma_release(struct sdhci_host *host)
1316 {
1317 }
1318
1319 static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1320                                                    struct mmc_command *cmd)
1321 {
1322         /* This should never happen */
1323         WARN_ON_ONCE(1);
1324 }
1325
1326 static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1327                                                    struct mmc_command *cmd)
1328 {
1329 }
1330
1331 static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1332                                                           struct mmc_data *data)
1333 {
1334         return NULL;
1335 }
1336
1337 #endif
1338
1339 void sdhci_switch_external_dma(struct sdhci_host *host, bool en)
1340 {
1341         host->use_external_dma = en;
1342 }
1343 EXPORT_SYMBOL_GPL(sdhci_switch_external_dma);
1344
1345 static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
1346                                     struct mmc_request *mrq)
1347 {
1348         return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
1349                !mrq->cap_cmd_during_tfr;
1350 }
1351
1352 static inline void sdhci_auto_cmd_select(struct sdhci_host *host,
1353                                          struct mmc_command *cmd,
1354                                          u16 *mode)
1355 {
1356         bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) &&
1357                          (cmd->opcode != SD_IO_RW_EXTENDED);
1358         bool use_cmd23 = cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23);
1359         u16 ctrl2;
1360
1361         /*
1362          * In case of Version 4.10 or later, use of 'Auto CMD Auto
1363          * Select' is recommended rather than use of 'Auto CMD12
1364          * Enable' or 'Auto CMD23 Enable'.
1365          */
1366         if (host->version >= SDHCI_SPEC_410 && (use_cmd12 || use_cmd23)) {
1367                 *mode |= SDHCI_TRNS_AUTO_SEL;
1368
1369                 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1370                 if (use_cmd23)
1371                         ctrl2 |= SDHCI_CMD23_ENABLE;
1372                 else
1373                         ctrl2 &= ~SDHCI_CMD23_ENABLE;
1374                 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
1375
1376                 return;
1377         }
1378
1379         /*
1380          * If we are sending CMD23, CMD12 never gets sent
1381          * on successful completion (so no Auto-CMD12).
1382          */
1383         if (use_cmd12)
1384                 *mode |= SDHCI_TRNS_AUTO_CMD12;
1385         else if (use_cmd23)
1386                 *mode |= SDHCI_TRNS_AUTO_CMD23;
1387 }
1388
1389 static void sdhci_set_transfer_mode(struct sdhci_host *host,
1390         struct mmc_command *cmd)
1391 {
1392         u16 mode = 0;
1393         struct mmc_data *data = cmd->data;
1394
1395         if (data == NULL) {
1396                 if (host->quirks2 &
1397                         SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
1398                         /* must not clear SDHCI_TRANSFER_MODE when tuning */
1399                         if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
1400                                 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
1401                 } else {
1402                 /* clear Auto CMD settings for no data CMDs */
1403                         mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
1404                         sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
1405                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
1406                 }
1407                 return;
1408         }
1409
1410         WARN_ON(!host->data);
1411
1412         if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
1413                 mode = SDHCI_TRNS_BLK_CNT_EN;
1414
1415         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
1416                 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
1417                 sdhci_auto_cmd_select(host, cmd, &mode);
1418                 if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23))
1419                         sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
1420         }
1421
1422         if (data->flags & MMC_DATA_READ)
1423                 mode |= SDHCI_TRNS_READ;
1424         if (host->flags & SDHCI_REQ_USE_DMA)
1425                 mode |= SDHCI_TRNS_DMA;
1426
1427         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
1428 }
1429
1430 static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
1431 {
1432         return (!(host->flags & SDHCI_DEVICE_DEAD) &&
1433                 ((mrq->cmd && mrq->cmd->error) ||
1434                  (mrq->sbc && mrq->sbc->error) ||
1435                  (mrq->data && mrq->data->stop && mrq->data->stop->error) ||
1436                  (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
1437 }
1438
1439 static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq)
1440 {
1441         int i;
1442
1443         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1444                 if (host->mrqs_done[i] == mrq) {
1445                         WARN_ON(1);
1446                         return;
1447                 }
1448         }
1449
1450         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1451                 if (!host->mrqs_done[i]) {
1452                         host->mrqs_done[i] = mrq;
1453                         break;
1454                 }
1455         }
1456
1457         WARN_ON(i >= SDHCI_MAX_MRQS);
1458 }
1459
1460 static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1461 {
1462         if (host->cmd && host->cmd->mrq == mrq)
1463                 host->cmd = NULL;
1464
1465         if (host->data_cmd && host->data_cmd->mrq == mrq)
1466                 host->data_cmd = NULL;
1467
1468         if (host->data && host->data->mrq == mrq)
1469                 host->data = NULL;
1470
1471         if (sdhci_needs_reset(host, mrq))
1472                 host->pending_reset = true;
1473
1474         sdhci_set_mrq_done(host, mrq);
1475
1476         sdhci_del_timer(host, mrq);
1477
1478         if (!sdhci_has_requests(host))
1479                 sdhci_led_deactivate(host);
1480 }
1481
1482 static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1483 {
1484         __sdhci_finish_mrq(host, mrq);
1485
1486         queue_work(host->complete_wq, &host->complete_work);
1487 }
1488
1489 static void sdhci_finish_data(struct sdhci_host *host)
1490 {
1491         struct mmc_command *data_cmd = host->data_cmd;
1492         struct mmc_data *data = host->data;
1493
1494         host->data = NULL;
1495         host->data_cmd = NULL;
1496
1497         /*
1498          * The controller needs a reset of internal state machines upon error
1499          * conditions.
1500          */
1501         if (data->error) {
1502                 if (!host->cmd || host->cmd == data_cmd)
1503                         sdhci_do_reset(host, SDHCI_RESET_CMD);
1504                 sdhci_do_reset(host, SDHCI_RESET_DATA);
1505         }
1506
1507         if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1508             (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1509                 sdhci_adma_table_post(host, data);
1510
1511         /*
1512          * The specification states that the block count register must
1513          * be updated, but it does not specify at what point in the
1514          * data flow. That makes the register entirely useless to read
1515          * back so we have to assume that nothing made it to the card
1516          * in the event of an error.
1517          */
1518         if (data->error)
1519                 data->bytes_xfered = 0;
1520         else
1521                 data->bytes_xfered = data->blksz * data->blocks;
1522
1523         /*
1524          * Need to send CMD12 if -
1525          * a) open-ended multiblock transfer not using auto CMD12 (no CMD23)
1526          * b) error in multiblock transfer
1527          */
1528         if (data->stop &&
1529             ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) ||
1530              data->error)) {
1531                 /*
1532                  * 'cap_cmd_during_tfr' request must not use the command line
1533                  * after mmc_command_done() has been called. It is upper layer's
1534                  * responsibility to send the stop command if required.
1535                  */
1536                 if (data->mrq->cap_cmd_during_tfr) {
1537                         __sdhci_finish_mrq(host, data->mrq);
1538                 } else {
1539                         /* Avoid triggering warning in sdhci_send_command() */
1540                         host->cmd = NULL;
1541                         sdhci_send_command(host, data->stop);
1542                 }
1543         } else {
1544                 __sdhci_finish_mrq(host, data->mrq);
1545         }
1546 }
1547
1548 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1549 {
1550         int flags;
1551         u32 mask;
1552         unsigned long timeout;
1553
1554         WARN_ON(host->cmd);
1555
1556         /* Initially, a command has no error */
1557         cmd->error = 0;
1558
1559         if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1560             cmd->opcode == MMC_STOP_TRANSMISSION)
1561                 cmd->flags |= MMC_RSP_BUSY;
1562
1563         /* Wait max 10 ms */
1564         timeout = 10;
1565
1566         mask = SDHCI_CMD_INHIBIT;
1567         if (sdhci_data_line_cmd(cmd))
1568                 mask |= SDHCI_DATA_INHIBIT;
1569
1570         /* We shouldn't wait for data inihibit for stop commands, even
1571            though they might use busy signaling */
1572         if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1573                 mask &= ~SDHCI_DATA_INHIBIT;
1574
1575         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1576                 if (timeout == 0) {
1577                         pr_err("%s: Controller never released inhibit bit(s).\n",
1578                                mmc_hostname(host->mmc));
1579                         sdhci_dumpregs(host);
1580                         cmd->error = -EIO;
1581                         sdhci_finish_mrq(host, cmd->mrq);
1582                         return;
1583                 }
1584                 timeout--;
1585                 mdelay(1);
1586         }
1587
1588         host->cmd = cmd;
1589         host->data_timeout = 0;
1590         if (sdhci_data_line_cmd(cmd)) {
1591                 WARN_ON(host->data_cmd);
1592                 host->data_cmd = cmd;
1593                 sdhci_set_timeout(host, cmd);
1594         }
1595
1596         if (cmd->data) {
1597                 if (host->use_external_dma)
1598                         sdhci_external_dma_prepare_data(host, cmd);
1599                 else
1600                         sdhci_prepare_data(host, cmd);
1601         }
1602
1603         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1604
1605         sdhci_set_transfer_mode(host, cmd);
1606
1607         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1608                 pr_err("%s: Unsupported response type!\n",
1609                         mmc_hostname(host->mmc));
1610                 cmd->error = -EINVAL;
1611                 sdhci_finish_mrq(host, cmd->mrq);
1612                 return;
1613         }
1614
1615         if (!(cmd->flags & MMC_RSP_PRESENT))
1616                 flags = SDHCI_CMD_RESP_NONE;
1617         else if (cmd->flags & MMC_RSP_136)
1618                 flags = SDHCI_CMD_RESP_LONG;
1619         else if (cmd->flags & MMC_RSP_BUSY)
1620                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1621         else
1622                 flags = SDHCI_CMD_RESP_SHORT;
1623
1624         if (cmd->flags & MMC_RSP_CRC)
1625                 flags |= SDHCI_CMD_CRC;
1626         if (cmd->flags & MMC_RSP_OPCODE)
1627                 flags |= SDHCI_CMD_INDEX;
1628
1629         /* CMD19 is special in that the Data Present Select should be set */
1630         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1631             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1632                 flags |= SDHCI_CMD_DATA;
1633
1634         timeout = jiffies;
1635         if (host->data_timeout)
1636                 timeout += nsecs_to_jiffies(host->data_timeout);
1637         else if (!cmd->data && cmd->busy_timeout > 9000)
1638                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1639         else
1640                 timeout += 10 * HZ;
1641         sdhci_mod_timer(host, cmd->mrq, timeout);
1642
1643         if (host->use_external_dma)
1644                 sdhci_external_dma_pre_transfer(host, cmd);
1645
1646         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1647 }
1648 EXPORT_SYMBOL_GPL(sdhci_send_command);
1649
1650 static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
1651 {
1652         int i, reg;
1653
1654         for (i = 0; i < 4; i++) {
1655                 reg = SDHCI_RESPONSE + (3 - i) * 4;
1656                 cmd->resp[i] = sdhci_readl(host, reg);
1657         }
1658
1659         if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
1660                 return;
1661
1662         /* CRC is stripped so we need to do some shifting */
1663         for (i = 0; i < 4; i++) {
1664                 cmd->resp[i] <<= 8;
1665                 if (i != 3)
1666                         cmd->resp[i] |= cmd->resp[i + 1] >> 24;
1667         }
1668 }
1669
1670 static void sdhci_finish_command(struct sdhci_host *host)
1671 {
1672         struct mmc_command *cmd = host->cmd;
1673
1674         host->cmd = NULL;
1675
1676         if (cmd->flags & MMC_RSP_PRESENT) {
1677                 if (cmd->flags & MMC_RSP_136) {
1678                         sdhci_read_rsp_136(host, cmd);
1679                 } else {
1680                         cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1681                 }
1682         }
1683
1684         if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1685                 mmc_command_done(host->mmc, cmd->mrq);
1686
1687         /*
1688          * The host can send and interrupt when the busy state has
1689          * ended, allowing us to wait without wasting CPU cycles.
1690          * The busy signal uses DAT0 so this is similar to waiting
1691          * for data to complete.
1692          *
1693          * Note: The 1.0 specification is a bit ambiguous about this
1694          *       feature so there might be some problems with older
1695          *       controllers.
1696          */
1697         if (cmd->flags & MMC_RSP_BUSY) {
1698                 if (cmd->data) {
1699                         DBG("Cannot wait for busy signal when also doing a data transfer");
1700                 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1701                            cmd == host->data_cmd) {
1702                         /* Command complete before busy is ended */
1703                         return;
1704                 }
1705         }
1706
1707         /* Finished CMD23, now send actual command. */
1708         if (cmd == cmd->mrq->sbc) {
1709                 sdhci_send_command(host, cmd->mrq->cmd);
1710         } else {
1711
1712                 /* Processed actual command. */
1713                 if (host->data && host->data_early)
1714                         sdhci_finish_data(host);
1715
1716                 if (!cmd->data)
1717                         __sdhci_finish_mrq(host, cmd->mrq);
1718         }
1719 }
1720
1721 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1722 {
1723         u16 preset = 0;
1724
1725         switch (host->timing) {
1726         case MMC_TIMING_UHS_SDR12:
1727                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1728                 break;
1729         case MMC_TIMING_UHS_SDR25:
1730                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1731                 break;
1732         case MMC_TIMING_UHS_SDR50:
1733                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1734                 break;
1735         case MMC_TIMING_UHS_SDR104:
1736         case MMC_TIMING_MMC_HS200:
1737                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1738                 break;
1739         case MMC_TIMING_UHS_DDR50:
1740         case MMC_TIMING_MMC_DDR52:
1741                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1742                 break;
1743         case MMC_TIMING_MMC_HS400:
1744                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1745                 break;
1746         default:
1747                 pr_warn("%s: Invalid UHS-I mode selected\n",
1748                         mmc_hostname(host->mmc));
1749                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1750                 break;
1751         }
1752         return preset;
1753 }
1754
1755 u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1756                    unsigned int *actual_clock)
1757 {
1758         int div = 0; /* Initialized for compiler warning */
1759         int real_div = div, clk_mul = 1;
1760         u16 clk = 0;
1761         bool switch_base_clk = false;
1762
1763         if (host->version >= SDHCI_SPEC_300) {
1764                 if (host->preset_enabled) {
1765                         u16 pre_val;
1766
1767                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1768                         pre_val = sdhci_get_preset_value(host);
1769                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1770                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1771                         if (host->clk_mul &&
1772                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1773                                 clk = SDHCI_PROG_CLOCK_MODE;
1774                                 real_div = div + 1;
1775                                 clk_mul = host->clk_mul;
1776                         } else {
1777                                 real_div = max_t(int, 1, div << 1);
1778                         }
1779                         goto clock_set;
1780                 }
1781
1782                 /*
1783                  * Check if the Host Controller supports Programmable Clock
1784                  * Mode.
1785                  */
1786                 if (host->clk_mul) {
1787                         for (div = 1; div <= 1024; div++) {
1788                                 if ((host->max_clk * host->clk_mul / div)
1789                                         <= clock)
1790                                         break;
1791                         }
1792                         if ((host->max_clk * host->clk_mul / div) <= clock) {
1793                                 /*
1794                                  * Set Programmable Clock Mode in the Clock
1795                                  * Control register.
1796                                  */
1797                                 clk = SDHCI_PROG_CLOCK_MODE;
1798                                 real_div = div;
1799                                 clk_mul = host->clk_mul;
1800                                 div--;
1801                         } else {
1802                                 /*
1803                                  * Divisor can be too small to reach clock
1804                                  * speed requirement. Then use the base clock.
1805                                  */
1806                                 switch_base_clk = true;
1807                         }
1808                 }
1809
1810                 if (!host->clk_mul || switch_base_clk) {
1811                         /* Version 3.00 divisors must be a multiple of 2. */
1812                         if (host->max_clk <= clock)
1813                                 div = 1;
1814                         else {
1815                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1816                                      div += 2) {
1817                                         if ((host->max_clk / div) <= clock)
1818                                                 break;
1819                                 }
1820                         }
1821                         real_div = div;
1822                         div >>= 1;
1823                         if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1824                                 && !div && host->max_clk <= 25000000)
1825                                 div = 1;
1826                 }
1827         } else {
1828                 /* Version 2.00 divisors must be a power of 2. */
1829                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1830                         if ((host->max_clk / div) <= clock)
1831                                 break;
1832                 }
1833                 real_div = div;
1834                 div >>= 1;
1835         }
1836
1837 clock_set:
1838         if (real_div)
1839                 *actual_clock = (host->max_clk * clk_mul) / real_div;
1840         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1841         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1842                 << SDHCI_DIVIDER_HI_SHIFT;
1843
1844         return clk;
1845 }
1846 EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1847
1848 void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1849 {
1850         ktime_t timeout;
1851
1852         clk |= SDHCI_CLOCK_INT_EN;
1853         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1854
1855         /* Wait max 150 ms */
1856         timeout = ktime_add_ms(ktime_get(), 150);
1857         while (1) {
1858                 bool timedout = ktime_after(ktime_get(), timeout);
1859
1860                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1861                 if (clk & SDHCI_CLOCK_INT_STABLE)
1862                         break;
1863                 if (timedout) {
1864                         pr_err("%s: Internal clock never stabilised.\n",
1865                                mmc_hostname(host->mmc));
1866                         sdhci_dumpregs(host);
1867                         return;
1868                 }
1869                 udelay(10);
1870         }
1871
1872         if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
1873                 clk |= SDHCI_CLOCK_PLL_EN;
1874                 clk &= ~SDHCI_CLOCK_INT_STABLE;
1875                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1876
1877                 /* Wait max 150 ms */
1878                 timeout = ktime_add_ms(ktime_get(), 150);
1879                 while (1) {
1880                         bool timedout = ktime_after(ktime_get(), timeout);
1881
1882                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1883                         if (clk & SDHCI_CLOCK_INT_STABLE)
1884                                 break;
1885                         if (timedout) {
1886                                 pr_err("%s: PLL clock never stabilised.\n",
1887                                        mmc_hostname(host->mmc));
1888                                 sdhci_dumpregs(host);
1889                                 return;
1890                         }
1891                         udelay(10);
1892                 }
1893         }
1894
1895         clk |= SDHCI_CLOCK_CARD_EN;
1896         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1897 }
1898 EXPORT_SYMBOL_GPL(sdhci_enable_clk);
1899
1900 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1901 {
1902         u16 clk;
1903
1904         host->mmc->actual_clock = 0;
1905
1906         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1907
1908         if (clock == 0)
1909                 return;
1910
1911         clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
1912         sdhci_enable_clk(host, clk);
1913 }
1914 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1915
1916 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
1917                                 unsigned short vdd)
1918 {
1919         struct mmc_host *mmc = host->mmc;
1920
1921         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1922
1923         if (mode != MMC_POWER_OFF)
1924                 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1925         else
1926                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1927 }
1928
1929 void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
1930                            unsigned short vdd)
1931 {
1932         u8 pwr = 0;
1933
1934         if (mode != MMC_POWER_OFF) {
1935                 switch (1 << vdd) {
1936                 case MMC_VDD_165_195:
1937                 /*
1938                  * Without a regulator, SDHCI does not support 2.0v
1939                  * so we only get here if the driver deliberately
1940                  * added the 2.0v range to ocr_avail. Map it to 1.8v
1941                  * for the purpose of turning on the power.
1942                  */
1943                 case MMC_VDD_20_21:
1944                         pwr = SDHCI_POWER_180;
1945                         break;
1946                 case MMC_VDD_29_30:
1947                 case MMC_VDD_30_31:
1948                         pwr = SDHCI_POWER_300;
1949                         break;
1950                 case MMC_VDD_32_33:
1951                 case MMC_VDD_33_34:
1952                         pwr = SDHCI_POWER_330;
1953                         break;
1954                 default:
1955                         WARN(1, "%s: Invalid vdd %#x\n",
1956                              mmc_hostname(host->mmc), vdd);
1957                         break;
1958                 }
1959         }
1960
1961         if (host->pwr == pwr)
1962                 return;
1963
1964         host->pwr = pwr;
1965
1966         if (pwr == 0) {
1967                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1968                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1969                         sdhci_runtime_pm_bus_off(host);
1970         } else {
1971                 /*
1972                  * Spec says that we should clear the power reg before setting
1973                  * a new value. Some controllers don't seem to like this though.
1974                  */
1975                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1976                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1977
1978                 /*
1979                  * At least the Marvell CaFe chip gets confused if we set the
1980                  * voltage and set turn on power at the same time, so set the
1981                  * voltage first.
1982                  */
1983                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1984                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1985
1986                 pwr |= SDHCI_POWER_ON;
1987
1988                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1989
1990                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1991                         sdhci_runtime_pm_bus_on(host);
1992
1993                 /*
1994                  * Some controllers need an extra 10ms delay of 10ms before
1995                  * they can apply clock after applying power
1996                  */
1997                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1998                         mdelay(10);
1999         }
2000 }
2001 EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
2002
2003 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
2004                      unsigned short vdd)
2005 {
2006         if (IS_ERR(host->mmc->supply.vmmc))
2007                 sdhci_set_power_noreg(host, mode, vdd);
2008         else
2009                 sdhci_set_power_reg(host, mode, vdd);
2010 }
2011 EXPORT_SYMBOL_GPL(sdhci_set_power);
2012
2013 /*****************************************************************************\
2014  *                                                                           *
2015  * MMC callbacks                                                             *
2016  *                                                                           *
2017 \*****************************************************************************/
2018
2019 void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
2020 {
2021         struct sdhci_host *host;
2022         int present;
2023         unsigned long flags;
2024
2025         host = mmc_priv(mmc);
2026
2027         /* Firstly check card presence */
2028         present = mmc->ops->get_cd(mmc);
2029
2030         spin_lock_irqsave(&host->lock, flags);
2031
2032         sdhci_led_activate(host);
2033
2034         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
2035                 mrq->cmd->error = -ENOMEDIUM;
2036                 sdhci_finish_mrq(host, mrq);
2037         } else {
2038                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
2039                         sdhci_send_command(host, mrq->sbc);
2040                 else
2041                         sdhci_send_command(host, mrq->cmd);
2042         }
2043
2044         spin_unlock_irqrestore(&host->lock, flags);
2045 }
2046 EXPORT_SYMBOL_GPL(sdhci_request);
2047
2048 void sdhci_set_bus_width(struct sdhci_host *host, int width)
2049 {
2050         u8 ctrl;
2051
2052         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2053         if (width == MMC_BUS_WIDTH_8) {
2054                 ctrl &= ~SDHCI_CTRL_4BITBUS;
2055                 ctrl |= SDHCI_CTRL_8BITBUS;
2056         } else {
2057                 if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
2058                         ctrl &= ~SDHCI_CTRL_8BITBUS;
2059                 if (width == MMC_BUS_WIDTH_4)
2060                         ctrl |= SDHCI_CTRL_4BITBUS;
2061                 else
2062                         ctrl &= ~SDHCI_CTRL_4BITBUS;
2063         }
2064         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2065 }
2066 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
2067
2068 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
2069 {
2070         u16 ctrl_2;
2071
2072         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2073         /* Select Bus Speed Mode for host */
2074         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
2075         if ((timing == MMC_TIMING_MMC_HS200) ||
2076             (timing == MMC_TIMING_UHS_SDR104))
2077                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
2078         else if (timing == MMC_TIMING_UHS_SDR12)
2079                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
2080         else if (timing == MMC_TIMING_UHS_SDR25)
2081                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
2082         else if (timing == MMC_TIMING_UHS_SDR50)
2083                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
2084         else if ((timing == MMC_TIMING_UHS_DDR50) ||
2085                  (timing == MMC_TIMING_MMC_DDR52))
2086                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
2087         else if (timing == MMC_TIMING_MMC_HS400)
2088                 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
2089         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2090 }
2091 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
2092
2093 void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
2094 {
2095         struct sdhci_host *host = mmc_priv(mmc);
2096         u8 ctrl;
2097
2098         if (ios->power_mode == MMC_POWER_UNDEFINED)
2099                 return;
2100
2101         if (host->flags & SDHCI_DEVICE_DEAD) {
2102                 if (!IS_ERR(mmc->supply.vmmc) &&
2103                     ios->power_mode == MMC_POWER_OFF)
2104                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
2105                 return;
2106         }
2107
2108         /*
2109          * Reset the chip on each power off.
2110          * Should clear out any weird states.
2111          */
2112         if (ios->power_mode == MMC_POWER_OFF) {
2113                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2114                 sdhci_reinit(host);
2115         }
2116
2117         if (host->version >= SDHCI_SPEC_300 &&
2118                 (ios->power_mode == MMC_POWER_UP) &&
2119                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
2120                 sdhci_enable_preset_value(host, false);
2121
2122         if (!ios->clock || ios->clock != host->clock) {
2123                 host->ops->set_clock(host, ios->clock);
2124                 host->clock = ios->clock;
2125
2126                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
2127                     host->clock) {
2128                         host->timeout_clk = host->mmc->actual_clock ?
2129                                                 host->mmc->actual_clock / 1000 :
2130                                                 host->clock / 1000;
2131                         host->mmc->max_busy_timeout =
2132                                 host->ops->get_max_timeout_count ?
2133                                 host->ops->get_max_timeout_count(host) :
2134                                 1 << 27;
2135                         host->mmc->max_busy_timeout /= host->timeout_clk;
2136                 }
2137         }
2138
2139         if (host->ops->set_power)
2140                 host->ops->set_power(host, ios->power_mode, ios->vdd);
2141         else
2142                 sdhci_set_power(host, ios->power_mode, ios->vdd);
2143
2144         if (host->ops->platform_send_init_74_clocks)
2145                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
2146
2147         host->ops->set_bus_width(host, ios->bus_width);
2148
2149         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2150
2151         if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
2152                 if (ios->timing == MMC_TIMING_SD_HS ||
2153                      ios->timing == MMC_TIMING_MMC_HS ||
2154                      ios->timing == MMC_TIMING_MMC_HS400 ||
2155                      ios->timing == MMC_TIMING_MMC_HS200 ||
2156                      ios->timing == MMC_TIMING_MMC_DDR52 ||
2157                      ios->timing == MMC_TIMING_UHS_SDR50 ||
2158                      ios->timing == MMC_TIMING_UHS_SDR104 ||
2159                      ios->timing == MMC_TIMING_UHS_DDR50 ||
2160                      ios->timing == MMC_TIMING_UHS_SDR25)
2161                         ctrl |= SDHCI_CTRL_HISPD;
2162                 else
2163                         ctrl &= ~SDHCI_CTRL_HISPD;
2164         }
2165
2166         if (host->version >= SDHCI_SPEC_300) {
2167                 u16 clk, ctrl_2;
2168
2169                 if (!host->preset_enabled) {
2170                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2171                         /*
2172                          * We only need to set Driver Strength if the
2173                          * preset value enable is not set.
2174                          */
2175                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2176                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
2177                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
2178                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
2179                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
2180                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2181                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
2182                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
2183                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
2184                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
2185                         else {
2186                                 pr_warn("%s: invalid driver type, default to driver type B\n",
2187                                         mmc_hostname(mmc));
2188                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2189                         }
2190
2191                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2192                 } else {
2193                         /*
2194                          * According to SDHC Spec v3.00, if the Preset Value
2195                          * Enable in the Host Control 2 register is set, we
2196                          * need to reset SD Clock Enable before changing High
2197                          * Speed Enable to avoid generating clock gliches.
2198                          */
2199
2200                         /* Reset SD Clock Enable */
2201                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2202                         clk &= ~SDHCI_CLOCK_CARD_EN;
2203                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2204
2205                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2206
2207                         /* Re-enable SD Clock */
2208                         host->ops->set_clock(host, host->clock);
2209                 }
2210
2211                 /* Reset SD Clock Enable */
2212                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2213                 clk &= ~SDHCI_CLOCK_CARD_EN;
2214                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2215
2216                 host->ops->set_uhs_signaling(host, ios->timing);
2217                 host->timing = ios->timing;
2218
2219                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
2220                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
2221                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
2222                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
2223                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
2224                                  (ios->timing == MMC_TIMING_UHS_DDR50) ||
2225                                  (ios->timing == MMC_TIMING_MMC_DDR52))) {
2226                         u16 preset;
2227
2228                         sdhci_enable_preset_value(host, true);
2229                         preset = sdhci_get_preset_value(host);
2230                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
2231                                 >> SDHCI_PRESET_DRV_SHIFT;
2232                 }
2233
2234                 /* Re-enable SD Clock */
2235                 host->ops->set_clock(host, host->clock);
2236         } else
2237                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2238
2239         /*
2240          * Some (ENE) controllers go apeshit on some ios operation,
2241          * signalling timeout and CRC errors even on CMD0. Resetting
2242          * it on each ios seems to solve the problem.
2243          */
2244         if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
2245                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
2246 }
2247 EXPORT_SYMBOL_GPL(sdhci_set_ios);
2248
2249 static int sdhci_get_cd(struct mmc_host *mmc)
2250 {
2251         struct sdhci_host *host = mmc_priv(mmc);
2252         int gpio_cd = mmc_gpio_get_cd(mmc);
2253
2254         if (host->flags & SDHCI_DEVICE_DEAD)
2255                 return 0;
2256
2257         /* If nonremovable, assume that the card is always present. */
2258         if (!mmc_card_is_removable(host->mmc))
2259                 return 1;
2260
2261         /*
2262          * Try slot gpio detect, if defined it take precedence
2263          * over build in controller functionality
2264          */
2265         if (gpio_cd >= 0)
2266                 return !!gpio_cd;
2267
2268         /* If polling, assume that the card is always present. */
2269         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2270                 return 1;
2271
2272         /* Host native card detect */
2273         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
2274 }
2275
2276 static int sdhci_check_ro(struct sdhci_host *host)
2277 {
2278         unsigned long flags;
2279         int is_readonly;
2280
2281         spin_lock_irqsave(&host->lock, flags);
2282
2283         if (host->flags & SDHCI_DEVICE_DEAD)
2284                 is_readonly = 0;
2285         else if (host->ops->get_ro)
2286                 is_readonly = host->ops->get_ro(host);
2287         else if (mmc_can_gpio_ro(host->mmc))
2288                 is_readonly = mmc_gpio_get_ro(host->mmc);
2289         else
2290                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
2291                                 & SDHCI_WRITE_PROTECT);
2292
2293         spin_unlock_irqrestore(&host->lock, flags);
2294
2295         /* This quirk needs to be replaced by a callback-function later */
2296         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
2297                 !is_readonly : is_readonly;
2298 }
2299
2300 #define SAMPLE_COUNT    5
2301
2302 static int sdhci_get_ro(struct mmc_host *mmc)
2303 {
2304         struct sdhci_host *host = mmc_priv(mmc);
2305         int i, ro_count;
2306
2307         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
2308                 return sdhci_check_ro(host);
2309
2310         ro_count = 0;
2311         for (i = 0; i < SAMPLE_COUNT; i++) {
2312                 if (sdhci_check_ro(host)) {
2313                         if (++ro_count > SAMPLE_COUNT / 2)
2314                                 return 1;
2315                 }
2316                 msleep(30);
2317         }
2318         return 0;
2319 }
2320
2321 static void sdhci_hw_reset(struct mmc_host *mmc)
2322 {
2323         struct sdhci_host *host = mmc_priv(mmc);
2324
2325         if (host->ops && host->ops->hw_reset)
2326                 host->ops->hw_reset(host);
2327 }
2328
2329 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
2330 {
2331         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
2332                 if (enable)
2333                         host->ier |= SDHCI_INT_CARD_INT;
2334                 else
2335                         host->ier &= ~SDHCI_INT_CARD_INT;
2336
2337                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2338                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2339         }
2340 }
2341
2342 void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
2343 {
2344         struct sdhci_host *host = mmc_priv(mmc);
2345         unsigned long flags;
2346
2347         if (enable)
2348                 pm_runtime_get_noresume(host->mmc->parent);
2349
2350         spin_lock_irqsave(&host->lock, flags);
2351         sdhci_enable_sdio_irq_nolock(host, enable);
2352         spin_unlock_irqrestore(&host->lock, flags);
2353
2354         if (!enable)
2355                 pm_runtime_put_noidle(host->mmc->parent);
2356 }
2357 EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
2358
2359 static void sdhci_ack_sdio_irq(struct mmc_host *mmc)
2360 {
2361         struct sdhci_host *host = mmc_priv(mmc);
2362         unsigned long flags;
2363
2364         spin_lock_irqsave(&host->lock, flags);
2365         sdhci_enable_sdio_irq_nolock(host, true);
2366         spin_unlock_irqrestore(&host->lock, flags);
2367 }
2368
2369 int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
2370                                       struct mmc_ios *ios)
2371 {
2372         struct sdhci_host *host = mmc_priv(mmc);
2373         u16 ctrl;
2374         int ret;
2375
2376         /*
2377          * Signal Voltage Switching is only applicable for Host Controllers
2378          * v3.00 and above.
2379          */
2380         if (host->version < SDHCI_SPEC_300)
2381                 return 0;
2382
2383         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2384
2385         switch (ios->signal_voltage) {
2386         case MMC_SIGNAL_VOLTAGE_330:
2387                 if (!(host->flags & SDHCI_SIGNALING_330))
2388                         return -EINVAL;
2389                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
2390                 ctrl &= ~SDHCI_CTRL_VDD_180;
2391                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2392
2393                 if (!IS_ERR(mmc->supply.vqmmc)) {
2394                         ret = mmc_regulator_set_vqmmc(mmc, ios);
2395                         if (ret) {
2396                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
2397                                         mmc_hostname(mmc));
2398                                 return -EIO;
2399                         }
2400                 }
2401                 /* Wait for 5ms */
2402                 usleep_range(5000, 5500);
2403
2404                 /* 3.3V regulator output should be stable within 5 ms */
2405                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2406                 if (!(ctrl & SDHCI_CTRL_VDD_180))
2407                         return 0;
2408
2409                 pr_warn("%s: 3.3V regulator output did not become stable\n",
2410                         mmc_hostname(mmc));
2411
2412                 return -EAGAIN;
2413         case MMC_SIGNAL_VOLTAGE_180:
2414                 if (!(host->flags & SDHCI_SIGNALING_180))
2415                         return -EINVAL;
2416                 if (!IS_ERR(mmc->supply.vqmmc)) {
2417                         ret = mmc_regulator_set_vqmmc(mmc, ios);
2418                         if (ret) {
2419                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
2420                                         mmc_hostname(mmc));
2421                                 return -EIO;
2422                         }
2423                 }
2424
2425                 /*
2426                  * Enable 1.8V Signal Enable in the Host Control2
2427                  * register
2428                  */
2429                 ctrl |= SDHCI_CTRL_VDD_180;
2430                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2431
2432                 /* Some controller need to do more when switching */
2433                 if (host->ops->voltage_switch)
2434                         host->ops->voltage_switch(host);
2435
2436                 /* 1.8V regulator output should be stable within 5 ms */
2437                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2438                 if (ctrl & SDHCI_CTRL_VDD_180)
2439                         return 0;
2440
2441                 pr_warn("%s: 1.8V regulator output did not become stable\n",
2442                         mmc_hostname(mmc));
2443
2444                 return -EAGAIN;
2445         case MMC_SIGNAL_VOLTAGE_120:
2446                 if (!(host->flags & SDHCI_SIGNALING_120))
2447                         return -EINVAL;
2448                 if (!IS_ERR(mmc->supply.vqmmc)) {
2449                         ret = mmc_regulator_set_vqmmc(mmc, ios);
2450                         if (ret) {
2451                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
2452                                         mmc_hostname(mmc));
2453                                 return -EIO;
2454                         }
2455                 }
2456                 return 0;
2457         default:
2458                 /* No signal voltage switch required */
2459                 return 0;
2460         }
2461 }
2462 EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
2463
2464 static int sdhci_card_busy(struct mmc_host *mmc)
2465 {
2466         struct sdhci_host *host = mmc_priv(mmc);
2467         u32 present_state;
2468
2469         /* Check whether DAT[0] is 0 */
2470         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
2471
2472         return !(present_state & SDHCI_DATA_0_LVL_MASK);
2473 }
2474
2475 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
2476 {
2477         struct sdhci_host *host = mmc_priv(mmc);
2478         unsigned long flags;
2479
2480         spin_lock_irqsave(&host->lock, flags);
2481         host->flags |= SDHCI_HS400_TUNING;
2482         spin_unlock_irqrestore(&host->lock, flags);
2483
2484         return 0;
2485 }
2486
2487 void sdhci_start_tuning(struct sdhci_host *host)
2488 {
2489         u16 ctrl;
2490
2491         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2492         ctrl |= SDHCI_CTRL_EXEC_TUNING;
2493         if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
2494                 ctrl |= SDHCI_CTRL_TUNED_CLK;
2495         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2496
2497         /*
2498          * As per the Host Controller spec v3.00, tuning command
2499          * generates Buffer Read Ready interrupt, so enable that.
2500          *
2501          * Note: The spec clearly says that when tuning sequence
2502          * is being performed, the controller does not generate
2503          * interrupts other than Buffer Read Ready interrupt. But
2504          * to make sure we don't hit a controller bug, we _only_
2505          * enable Buffer Read Ready interrupt here.
2506          */
2507         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
2508         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
2509 }
2510 EXPORT_SYMBOL_GPL(sdhci_start_tuning);
2511
2512 void sdhci_end_tuning(struct sdhci_host *host)
2513 {
2514         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2515         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2516 }
2517 EXPORT_SYMBOL_GPL(sdhci_end_tuning);
2518
2519 void sdhci_reset_tuning(struct sdhci_host *host)
2520 {
2521         u16 ctrl;
2522
2523         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2524         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2525         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2526         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2527 }
2528 EXPORT_SYMBOL_GPL(sdhci_reset_tuning);
2529
2530 void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
2531 {
2532         sdhci_reset_tuning(host);
2533
2534         sdhci_do_reset(host, SDHCI_RESET_CMD);
2535         sdhci_do_reset(host, SDHCI_RESET_DATA);
2536
2537         sdhci_end_tuning(host);
2538
2539         mmc_abort_tuning(host->mmc, opcode);
2540 }
2541 EXPORT_SYMBOL_GPL(sdhci_abort_tuning);
2542
2543 /*
2544  * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2545  * tuning command does not have a data payload (or rather the hardware does it
2546  * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2547  * interrupt setup is different to other commands and there is no timeout
2548  * interrupt so special handling is needed.
2549  */
2550 void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
2551 {
2552         struct mmc_host *mmc = host->mmc;
2553         struct mmc_command cmd = {};
2554         struct mmc_request mrq = {};
2555         unsigned long flags;
2556         u32 b = host->sdma_boundary;
2557
2558         spin_lock_irqsave(&host->lock, flags);
2559
2560         cmd.opcode = opcode;
2561         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2562         cmd.mrq = &mrq;
2563
2564         mrq.cmd = &cmd;
2565         /*
2566          * In response to CMD19, the card sends 64 bytes of tuning
2567          * block to the Host Controller. So we set the block size
2568          * to 64 here.
2569          */
2570         if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2571             mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2572                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
2573         else
2574                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
2575
2576         /*
2577          * The tuning block is sent by the card to the host controller.
2578          * So we set the TRNS_READ bit in the Transfer Mode register.
2579          * This also takes care of setting DMA Enable and Multi Block
2580          * Select in the same register to 0.
2581          */
2582         sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2583
2584         sdhci_send_command(host, &cmd);
2585
2586         host->cmd = NULL;
2587
2588         sdhci_del_timer(host, &mrq);
2589
2590         host->tuning_done = 0;
2591
2592         spin_unlock_irqrestore(&host->lock, flags);
2593
2594         /* Wait for Buffer Read Ready interrupt */
2595         wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2596                            msecs_to_jiffies(50));
2597
2598 }
2599 EXPORT_SYMBOL_GPL(sdhci_send_tuning);
2600
2601 static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
2602 {
2603         int i;
2604
2605         /*
2606          * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2607          * of loops reaches tuning loop count.
2608          */
2609         for (i = 0; i < host->tuning_loop_count; i++) {
2610                 u16 ctrl;
2611
2612                 sdhci_send_tuning(host, opcode);
2613
2614                 if (!host->tuning_done) {
2615                         pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n",
2616                                  mmc_hostname(host->mmc));
2617                         sdhci_abort_tuning(host, opcode);
2618                         return -ETIMEDOUT;
2619                 }
2620
2621                 /* Spec does not require a delay between tuning cycles */
2622                 if (host->tuning_delay > 0)
2623                         mdelay(host->tuning_delay);
2624
2625                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2626                 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2627                         if (ctrl & SDHCI_CTRL_TUNED_CLK)
2628                                 return 0; /* Success! */
2629                         break;
2630                 }
2631
2632         }
2633
2634         pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2635                 mmc_hostname(host->mmc));
2636         sdhci_reset_tuning(host);
2637         return -EAGAIN;
2638 }
2639
2640 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2641 {
2642         struct sdhci_host *host = mmc_priv(mmc);
2643         int err = 0;
2644         unsigned int tuning_count = 0;
2645         bool hs400_tuning;
2646
2647         hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2648
2649         if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2650                 tuning_count = host->tuning_count;
2651
2652         /*
2653          * The Host Controller needs tuning in case of SDR104 and DDR50
2654          * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2655          * the Capabilities register.
2656          * If the Host Controller supports the HS200 mode then the
2657          * tuning function has to be executed.
2658          */
2659         switch (host->timing) {
2660         /* HS400 tuning is done in HS200 mode */
2661         case MMC_TIMING_MMC_HS400:
2662                 err = -EINVAL;
2663                 goto out;
2664
2665         case MMC_TIMING_MMC_HS200:
2666                 /*
2667                  * Periodic re-tuning for HS400 is not expected to be needed, so
2668                  * disable it here.
2669                  */
2670                 if (hs400_tuning)
2671                         tuning_count = 0;
2672                 break;
2673
2674         case MMC_TIMING_UHS_SDR104:
2675         case MMC_TIMING_UHS_DDR50:
2676                 break;
2677
2678         case MMC_TIMING_UHS_SDR50:
2679                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2680                         break;
2681                 /* FALLTHROUGH */
2682
2683         default:
2684                 goto out;
2685         }
2686
2687         if (host->ops->platform_execute_tuning) {
2688                 err = host->ops->platform_execute_tuning(host, opcode);
2689                 goto out;
2690         }
2691
2692         host->mmc->retune_period = tuning_count;
2693
2694         if (host->tuning_delay < 0)
2695                 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
2696
2697         sdhci_start_tuning(host);
2698
2699         host->tuning_err = __sdhci_execute_tuning(host, opcode);
2700
2701         sdhci_end_tuning(host);
2702 out:
2703         host->flags &= ~SDHCI_HS400_TUNING;
2704
2705         return err;
2706 }
2707 EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2708
2709 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2710 {
2711         /* Host Controller v3.00 defines preset value registers */
2712         if (host->version < SDHCI_SPEC_300)
2713                 return;
2714
2715         /*
2716          * We only enable or disable Preset Value if they are not already
2717          * enabled or disabled respectively. Otherwise, we bail out.
2718          */
2719         if (host->preset_enabled != enable) {
2720                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2721
2722                 if (enable)
2723                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2724                 else
2725                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2726
2727                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2728
2729                 if (enable)
2730                         host->flags |= SDHCI_PV_ENABLED;
2731                 else
2732                         host->flags &= ~SDHCI_PV_ENABLED;
2733
2734                 host->preset_enabled = enable;
2735         }
2736 }
2737
2738 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2739                                 int err)
2740 {
2741         struct sdhci_host *host = mmc_priv(mmc);
2742         struct mmc_data *data = mrq->data;
2743
2744         if (data->host_cookie != COOKIE_UNMAPPED)
2745                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2746                              mmc_get_dma_dir(data));
2747
2748         data->host_cookie = COOKIE_UNMAPPED;
2749 }
2750
2751 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2752 {
2753         struct sdhci_host *host = mmc_priv(mmc);
2754
2755         mrq->data->host_cookie = COOKIE_UNMAPPED;
2756
2757         /*
2758          * No pre-mapping in the pre hook if we're using the bounce buffer,
2759          * for that we would need two bounce buffers since one buffer is
2760          * in flight when this is getting called.
2761          */
2762         if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer)
2763                 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2764 }
2765
2766 static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
2767 {
2768         if (host->data_cmd) {
2769                 host->data_cmd->error = err;
2770                 sdhci_finish_mrq(host, host->data_cmd->mrq);
2771         }
2772
2773         if (host->cmd) {
2774                 host->cmd->error = err;
2775                 sdhci_finish_mrq(host, host->cmd->mrq);
2776         }
2777 }
2778
2779 static void sdhci_card_event(struct mmc_host *mmc)
2780 {
2781         struct sdhci_host *host = mmc_priv(mmc);
2782         unsigned long flags;
2783         int present;
2784
2785         /* First check if client has provided their own card event */
2786         if (host->ops->card_event)
2787                 host->ops->card_event(host);
2788
2789         present = mmc->ops->get_cd(mmc);
2790
2791         spin_lock_irqsave(&host->lock, flags);
2792
2793         /* Check sdhci_has_requests() first in case we are runtime suspended */
2794         if (sdhci_has_requests(host) && !present) {
2795                 pr_err("%s: Card removed during transfer!\n",
2796                         mmc_hostname(host->mmc));
2797                 pr_err("%s: Resetting controller.\n",
2798                         mmc_hostname(host->mmc));
2799
2800                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2801                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2802
2803                 sdhci_error_out_mrqs(host, -ENOMEDIUM);
2804         }
2805
2806         spin_unlock_irqrestore(&host->lock, flags);
2807 }
2808
2809 static const struct mmc_host_ops sdhci_ops = {
2810         .request        = sdhci_request,
2811         .post_req       = sdhci_post_req,
2812         .pre_req        = sdhci_pre_req,
2813         .set_ios        = sdhci_set_ios,
2814         .get_cd         = sdhci_get_cd,
2815         .get_ro         = sdhci_get_ro,
2816         .hw_reset       = sdhci_hw_reset,
2817         .enable_sdio_irq = sdhci_enable_sdio_irq,
2818         .ack_sdio_irq    = sdhci_ack_sdio_irq,
2819         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2820         .prepare_hs400_tuning           = sdhci_prepare_hs400_tuning,
2821         .execute_tuning                 = sdhci_execute_tuning,
2822         .card_event                     = sdhci_card_event,
2823         .card_busy      = sdhci_card_busy,
2824 };
2825
2826 /*****************************************************************************\
2827  *                                                                           *
2828  * Request done                                                              *
2829  *                                                                           *
2830 \*****************************************************************************/
2831
2832 static bool sdhci_request_done(struct sdhci_host *host)
2833 {
2834         unsigned long flags;
2835         struct mmc_request *mrq;
2836         int i;
2837
2838         spin_lock_irqsave(&host->lock, flags);
2839
2840         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
2841                 mrq = host->mrqs_done[i];
2842                 if (mrq)
2843                         break;
2844         }
2845
2846         if (!mrq) {
2847                 spin_unlock_irqrestore(&host->lock, flags);
2848                 return true;
2849         }
2850
2851         /*
2852          * Always unmap the data buffers if they were mapped by
2853          * sdhci_prepare_data() whenever we finish with a request.
2854          * This avoids leaking DMA mappings on error.
2855          */
2856         if (host->flags & SDHCI_REQ_USE_DMA) {
2857                 struct mmc_data *data = mrq->data;
2858
2859                 if (host->use_external_dma && data &&
2860                     (mrq->cmd->error || data->error)) {
2861                         struct dma_chan *chan = sdhci_external_dma_channel(host, data);
2862
2863                         host->mrqs_done[i] = NULL;
2864                         spin_unlock_irqrestore(&host->lock, flags);
2865                         dmaengine_terminate_sync(chan);
2866                         spin_lock_irqsave(&host->lock, flags);
2867                         sdhci_set_mrq_done(host, mrq);
2868                 }
2869
2870                 if (data && data->host_cookie == COOKIE_MAPPED) {
2871                         if (host->bounce_buffer) {
2872                                 /*
2873                                  * On reads, copy the bounced data into the
2874                                  * sglist
2875                                  */
2876                                 if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) {
2877                                         unsigned int length = data->bytes_xfered;
2878
2879                                         if (length > host->bounce_buffer_size) {
2880                                                 pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n",
2881                                                        mmc_hostname(host->mmc),
2882                                                        host->bounce_buffer_size,
2883                                                        data->bytes_xfered);
2884                                                 /* Cap it down and continue */
2885                                                 length = host->bounce_buffer_size;
2886                                         }
2887                                         dma_sync_single_for_cpu(
2888                                                 host->mmc->parent,
2889                                                 host->bounce_addr,
2890                                                 host->bounce_buffer_size,
2891                                                 DMA_FROM_DEVICE);
2892                                         sg_copy_from_buffer(data->sg,
2893                                                 data->sg_len,
2894                                                 host->bounce_buffer,
2895                                                 length);
2896                                 } else {
2897                                         /* No copying, just switch ownership */
2898                                         dma_sync_single_for_cpu(
2899                                                 host->mmc->parent,
2900                                                 host->bounce_addr,
2901                                                 host->bounce_buffer_size,
2902                                                 mmc_get_dma_dir(data));
2903                                 }
2904                         } else {
2905                                 /* Unmap the raw data */
2906                                 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
2907                                              data->sg_len,
2908                                              mmc_get_dma_dir(data));
2909                         }
2910                         data->host_cookie = COOKIE_UNMAPPED;
2911                 }
2912         }
2913
2914         /*
2915          * The controller needs a reset of internal state machines
2916          * upon error conditions.
2917          */
2918         if (sdhci_needs_reset(host, mrq)) {
2919                 /*
2920                  * Do not finish until command and data lines are available for
2921                  * reset. Note there can only be one other mrq, so it cannot
2922                  * also be in mrqs_done, otherwise host->cmd and host->data_cmd
2923                  * would both be null.
2924                  */
2925                 if (host->cmd || host->data_cmd) {
2926                         spin_unlock_irqrestore(&host->lock, flags);
2927                         return true;
2928                 }
2929
2930                 /* Some controllers need this kick or reset won't work here */
2931                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2932                         /* This is to force an update */
2933                         host->ops->set_clock(host, host->clock);
2934
2935                 /* Spec says we should do both at the same time, but Ricoh
2936                    controllers do not like that. */
2937                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2938                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2939
2940                 host->pending_reset = false;
2941         }
2942
2943         host->mrqs_done[i] = NULL;
2944
2945         spin_unlock_irqrestore(&host->lock, flags);
2946
2947         if (host->ops->request_done)
2948                 host->ops->request_done(host, mrq);
2949         else
2950                 mmc_request_done(host->mmc, mrq);
2951
2952         return false;
2953 }
2954
2955 static void sdhci_complete_work(struct work_struct *work)
2956 {
2957         struct sdhci_host *host = container_of(work, struct sdhci_host,
2958                                                complete_work);
2959
2960         while (!sdhci_request_done(host))
2961                 ;
2962 }
2963
2964 static void sdhci_timeout_timer(struct timer_list *t)
2965 {
2966         struct sdhci_host *host;
2967         unsigned long flags;
2968
2969         host = from_timer(host, t, timer);
2970
2971         spin_lock_irqsave(&host->lock, flags);
2972
2973         if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
2974                 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
2975                        mmc_hostname(host->mmc));
2976                 sdhci_dumpregs(host);
2977
2978                 host->cmd->error = -ETIMEDOUT;
2979                 sdhci_finish_mrq(host, host->cmd->mrq);
2980         }
2981
2982         spin_unlock_irqrestore(&host->lock, flags);
2983 }
2984
2985 static void sdhci_timeout_data_timer(struct timer_list *t)
2986 {
2987         struct sdhci_host *host;
2988         unsigned long flags;
2989
2990         host = from_timer(host, t, data_timer);
2991
2992         spin_lock_irqsave(&host->lock, flags);
2993
2994         if (host->data || host->data_cmd ||
2995             (host->cmd && sdhci_data_line_cmd(host->cmd))) {
2996                 pr_err("%s: Timeout waiting for hardware interrupt.\n",
2997                        mmc_hostname(host->mmc));
2998                 sdhci_dumpregs(host);
2999
3000                 if (host->data) {
3001                         host->data->error = -ETIMEDOUT;
3002                         sdhci_finish_data(host);
3003                         queue_work(host->complete_wq, &host->complete_work);
3004                 } else if (host->data_cmd) {
3005                         host->data_cmd->error = -ETIMEDOUT;
3006                         sdhci_finish_mrq(host, host->data_cmd->mrq);
3007                 } else {
3008                         host->cmd->error = -ETIMEDOUT;
3009                         sdhci_finish_mrq(host, host->cmd->mrq);
3010                 }
3011         }
3012
3013         spin_unlock_irqrestore(&host->lock, flags);
3014 }
3015
3016 /*****************************************************************************\
3017  *                                                                           *
3018  * Interrupt handling                                                        *
3019  *                                                                           *
3020 \*****************************************************************************/
3021
3022 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
3023 {
3024         /* Handle auto-CMD12 error */
3025         if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) {
3026                 struct mmc_request *mrq = host->data_cmd->mrq;
3027                 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3028                 int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3029                                    SDHCI_INT_DATA_TIMEOUT :
3030                                    SDHCI_INT_DATA_CRC;
3031
3032                 /* Treat auto-CMD12 error the same as data error */
3033                 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
3034                         *intmask_p |= data_err_bit;
3035                         return;
3036                 }
3037         }
3038
3039         if (!host->cmd) {
3040                 /*
3041                  * SDHCI recovers from errors by resetting the cmd and data
3042                  * circuits.  Until that is done, there very well might be more
3043                  * interrupts, so ignore them in that case.
3044                  */
3045                 if (host->pending_reset)
3046                         return;
3047                 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
3048                        mmc_hostname(host->mmc), (unsigned)intmask);
3049                 sdhci_dumpregs(host);
3050                 return;
3051         }
3052
3053         if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
3054                        SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
3055                 if (intmask & SDHCI_INT_TIMEOUT)
3056                         host->cmd->error = -ETIMEDOUT;
3057                 else
3058                         host->cmd->error = -EILSEQ;
3059
3060                 /* Treat data command CRC error the same as data CRC error */
3061                 if (host->cmd->data &&
3062                     (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
3063                      SDHCI_INT_CRC) {
3064                         host->cmd = NULL;
3065                         *intmask_p |= SDHCI_INT_DATA_CRC;
3066                         return;
3067                 }
3068
3069                 __sdhci_finish_mrq(host, host->cmd->mrq);
3070                 return;
3071         }
3072
3073         /* Handle auto-CMD23 error */
3074         if (intmask & SDHCI_INT_AUTO_CMD_ERR) {
3075                 struct mmc_request *mrq = host->cmd->mrq;
3076                 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3077                 int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3078                           -ETIMEDOUT :
3079                           -EILSEQ;
3080
3081                 if (mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
3082                         mrq->sbc->error = err;
3083                         __sdhci_finish_mrq(host, mrq);
3084                         return;
3085                 }
3086         }
3087
3088         if (intmask & SDHCI_INT_RESPONSE)
3089                 sdhci_finish_command(host);
3090 }
3091
3092 static void sdhci_adma_show_error(struct sdhci_host *host)
3093 {
3094         void *desc = host->adma_table;
3095         dma_addr_t dma = host->adma_addr;
3096
3097         sdhci_dumpregs(host);
3098
3099         while (true) {
3100                 struct sdhci_adma2_64_desc *dma_desc = desc;
3101
3102                 if (host->flags & SDHCI_USE_64_BIT_DMA)
3103                         SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
3104                             (unsigned long long)dma,
3105                             le32_to_cpu(dma_desc->addr_hi),
3106                             le32_to_cpu(dma_desc->addr_lo),
3107                             le16_to_cpu(dma_desc->len),
3108                             le16_to_cpu(dma_desc->cmd));
3109                 else
3110                         SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
3111                             (unsigned long long)dma,
3112                             le32_to_cpu(dma_desc->addr_lo),
3113                             le16_to_cpu(dma_desc->len),
3114                             le16_to_cpu(dma_desc->cmd));
3115
3116                 desc += host->desc_sz;
3117                 dma += host->desc_sz;
3118
3119                 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
3120                         break;
3121         }
3122 }
3123
3124 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
3125 {
3126         u32 command;
3127
3128         /* CMD19 generates _only_ Buffer Read Ready interrupt */
3129         if (intmask & SDHCI_INT_DATA_AVAIL) {
3130                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
3131                 if (command == MMC_SEND_TUNING_BLOCK ||
3132                     command == MMC_SEND_TUNING_BLOCK_HS200) {
3133                         host->tuning_done = 1;
3134                         wake_up(&host->buf_ready_int);
3135                         return;
3136                 }
3137         }
3138
3139         if (!host->data) {
3140                 struct mmc_command *data_cmd = host->data_cmd;
3141
3142                 /*
3143                  * The "data complete" interrupt is also used to
3144                  * indicate that a busy state has ended. See comment
3145                  * above in sdhci_cmd_irq().
3146                  */
3147                 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
3148                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
3149                                 host->data_cmd = NULL;
3150                                 data_cmd->error = -ETIMEDOUT;
3151                                 __sdhci_finish_mrq(host, data_cmd->mrq);
3152                                 return;
3153                         }
3154                         if (intmask & SDHCI_INT_DATA_END) {
3155                                 host->data_cmd = NULL;
3156                                 /*
3157                                  * Some cards handle busy-end interrupt
3158                                  * before the command completed, so make
3159                                  * sure we do things in the proper order.
3160                                  */
3161                                 if (host->cmd == data_cmd)
3162                                         return;
3163
3164                                 __sdhci_finish_mrq(host, data_cmd->mrq);
3165                                 return;
3166                         }
3167                 }
3168
3169                 /*
3170                  * SDHCI recovers from errors by resetting the cmd and data
3171                  * circuits. Until that is done, there very well might be more
3172                  * interrupts, so ignore them in that case.
3173                  */
3174                 if (host->pending_reset)
3175                         return;
3176
3177                 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
3178                        mmc_hostname(host->mmc), (unsigned)intmask);
3179                 sdhci_dumpregs(host);
3180
3181                 return;
3182         }
3183
3184         if (intmask & SDHCI_INT_DATA_TIMEOUT)
3185                 host->data->error = -ETIMEDOUT;
3186         else if (intmask & SDHCI_INT_DATA_END_BIT)
3187                 host->data->error = -EILSEQ;
3188         else if ((intmask & SDHCI_INT_DATA_CRC) &&
3189                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
3190                         != MMC_BUS_TEST_R)
3191                 host->data->error = -EILSEQ;
3192         else if (intmask & SDHCI_INT_ADMA_ERROR) {
3193                 pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
3194                        intmask);
3195                 sdhci_adma_show_error(host);
3196                 host->data->error = -EIO;
3197                 if (host->ops->adma_workaround)
3198                         host->ops->adma_workaround(host, intmask);
3199         }
3200
3201         if (host->data->error)
3202                 sdhci_finish_data(host);
3203         else {
3204                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
3205                         sdhci_transfer_pio(host);
3206
3207                 /*
3208                  * We currently don't do anything fancy with DMA
3209                  * boundaries, but as we can't disable the feature
3210                  * we need to at least restart the transfer.
3211                  *
3212                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
3213                  * should return a valid address to continue from, but as
3214                  * some controllers are faulty, don't trust them.
3215                  */
3216                 if (intmask & SDHCI_INT_DMA_END) {
3217                         dma_addr_t dmastart, dmanow;
3218
3219                         dmastart = sdhci_sdma_address(host);
3220                         dmanow = dmastart + host->data->bytes_xfered;
3221                         /*
3222                          * Force update to the next DMA block boundary.
3223                          */
3224                         dmanow = (dmanow &
3225                                 ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
3226                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
3227                         host->data->bytes_xfered = dmanow - dmastart;
3228                         DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n",
3229                             &dmastart, host->data->bytes_xfered, &dmanow);
3230                         sdhci_set_sdma_addr(host, dmanow);
3231                 }
3232
3233                 if (intmask & SDHCI_INT_DATA_END) {
3234                         if (host->cmd == host->data_cmd) {
3235                                 /*
3236                                  * Data managed to finish before the
3237                                  * command completed. Make sure we do
3238                                  * things in the proper order.
3239                                  */
3240                                 host->data_early = 1;
3241                         } else {
3242                                 sdhci_finish_data(host);
3243                         }
3244                 }
3245         }
3246 }
3247
3248 static inline bool sdhci_defer_done(struct sdhci_host *host,
3249                                     struct mmc_request *mrq)
3250 {
3251         struct mmc_data *data = mrq->data;
3252
3253         return host->pending_reset ||
3254                ((host->flags & SDHCI_REQ_USE_DMA) && data &&
3255                 data->host_cookie == COOKIE_MAPPED);
3256 }
3257
3258 static irqreturn_t sdhci_irq(int irq, void *dev_id)
3259 {
3260         struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
3261         irqreturn_t result = IRQ_NONE;
3262         struct sdhci_host *host = dev_id;
3263         u32 intmask, mask, unexpected = 0;
3264         int max_loops = 16;
3265         int i;
3266
3267         spin_lock(&host->lock);
3268
3269         if (host->runtime_suspended) {
3270                 spin_unlock(&host->lock);
3271                 return IRQ_NONE;
3272         }
3273
3274         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3275         if (!intmask || intmask == 0xffffffff) {
3276                 result = IRQ_NONE;
3277                 goto out;
3278         }
3279
3280         do {
3281                 DBG("IRQ status 0x%08x\n", intmask);
3282
3283                 if (host->ops->irq) {
3284                         intmask = host->ops->irq(host, intmask);
3285                         if (!intmask)
3286                                 goto cont;
3287                 }
3288
3289                 /* Clear selected interrupts. */
3290                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3291                                   SDHCI_INT_BUS_POWER);
3292                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3293
3294                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3295                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
3296                                       SDHCI_CARD_PRESENT;
3297
3298                         /*
3299                          * There is a observation on i.mx esdhc.  INSERT
3300                          * bit will be immediately set again when it gets
3301                          * cleared, if a card is inserted.  We have to mask
3302                          * the irq to prevent interrupt storm which will
3303                          * freeze the system.  And the REMOVE gets the
3304                          * same situation.
3305                          *
3306                          * More testing are needed here to ensure it works
3307                          * for other platforms though.
3308                          */
3309                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
3310                                        SDHCI_INT_CARD_REMOVE);
3311                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
3312                                                SDHCI_INT_CARD_INSERT;
3313                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3314                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3315
3316                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
3317                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
3318
3319                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
3320                                                        SDHCI_INT_CARD_REMOVE);
3321                         result = IRQ_WAKE_THREAD;
3322                 }
3323
3324                 if (intmask & SDHCI_INT_CMD_MASK)
3325                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask);
3326
3327                 if (intmask & SDHCI_INT_DATA_MASK)
3328                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
3329
3330                 if (intmask & SDHCI_INT_BUS_POWER)
3331                         pr_err("%s: Card is consuming too much power!\n",
3332                                 mmc_hostname(host->mmc));
3333
3334                 if (intmask & SDHCI_INT_RETUNE)
3335                         mmc_retune_needed(host->mmc);
3336
3337                 if ((intmask & SDHCI_INT_CARD_INT) &&
3338                     (host->ier & SDHCI_INT_CARD_INT)) {
3339                         sdhci_enable_sdio_irq_nolock(host, false);
3340                         sdio_signal_irq(host->mmc);
3341                 }
3342
3343                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
3344                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3345                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
3346                              SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
3347
3348                 if (intmask) {
3349                         unexpected |= intmask;
3350                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3351                 }
3352 cont:
3353                 if (result == IRQ_NONE)
3354                         result = IRQ_HANDLED;
3355
3356                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3357         } while (intmask && --max_loops);
3358
3359         /* Determine if mrqs can be completed immediately */
3360         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3361                 struct mmc_request *mrq = host->mrqs_done[i];
3362
3363                 if (!mrq)
3364                         continue;
3365
3366                 if (sdhci_defer_done(host, mrq)) {
3367                         result = IRQ_WAKE_THREAD;
3368                 } else {
3369                         mrqs_done[i] = mrq;
3370                         host->mrqs_done[i] = NULL;
3371                 }
3372         }
3373 out:
3374         spin_unlock(&host->lock);
3375
3376         /* Process mrqs ready for immediate completion */
3377         for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3378                 if (!mrqs_done[i])
3379                         continue;
3380
3381                 if (host->ops->request_done)
3382                         host->ops->request_done(host, mrqs_done[i]);
3383                 else
3384                         mmc_request_done(host->mmc, mrqs_done[i]);
3385         }
3386
3387         if (unexpected) {
3388                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
3389                            mmc_hostname(host->mmc), unexpected);
3390                 sdhci_dumpregs(host);
3391         }
3392
3393         return result;
3394 }
3395
3396 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
3397 {
3398         struct sdhci_host *host = dev_id;
3399         unsigned long flags;
3400         u32 isr;
3401
3402         while (!sdhci_request_done(host))
3403                 ;
3404
3405         spin_lock_irqsave(&host->lock, flags);
3406         isr = host->thread_isr;
3407         host->thread_isr = 0;
3408         spin_unlock_irqrestore(&host->lock, flags);
3409
3410         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3411                 struct mmc_host *mmc = host->mmc;
3412
3413                 mmc->ops->card_event(mmc);
3414                 mmc_detect_change(mmc, msecs_to_jiffies(200));
3415         }
3416
3417         return IRQ_HANDLED;
3418 }
3419
3420 /*****************************************************************************\
3421  *                                                                           *
3422  * Suspend/resume                                                            *
3423  *                                                                           *
3424 \*****************************************************************************/
3425
3426 #ifdef CONFIG_PM
3427
3428 static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
3429 {
3430         return mmc_card_is_removable(host->mmc) &&
3431                !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3432                !mmc_can_gpio_cd(host->mmc);
3433 }
3434
3435 /*
3436  * To enable wakeup events, the corresponding events have to be enabled in
3437  * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
3438  * Table' in the SD Host Controller Standard Specification.
3439  * It is useless to restore SDHCI_INT_ENABLE state in
3440  * sdhci_disable_irq_wakeups() since it will be set by
3441  * sdhci_enable_card_detection() or sdhci_init().
3442  */
3443 static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
3444 {
3445         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
3446                   SDHCI_WAKE_ON_INT;
3447         u32 irq_val = 0;
3448         u8 wake_val = 0;
3449         u8 val;
3450
3451         if (sdhci_cd_irq_can_wakeup(host)) {
3452                 wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
3453                 irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
3454         }
3455
3456         if (mmc_card_wake_sdio_irq(host->mmc)) {
3457                 wake_val |= SDHCI_WAKE_ON_INT;
3458                 irq_val |= SDHCI_INT_CARD_INT;
3459         }
3460
3461         if (!irq_val)
3462                 return false;
3463
3464         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3465         val &= ~mask;
3466         val |= wake_val;
3467         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3468
3469         sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
3470
3471         host->irq_wake_enabled = !enable_irq_wake(host->irq);
3472
3473         return host->irq_wake_enabled;
3474 }
3475
3476 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
3477 {
3478         u8 val;
3479         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
3480                         | SDHCI_WAKE_ON_INT;
3481
3482         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3483         val &= ~mask;
3484         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3485
3486         disable_irq_wake(host->irq);
3487
3488         host->irq_wake_enabled = false;
3489 }
3490
3491 int sdhci_suspend_host(struct sdhci_host *host)
3492 {
3493         sdhci_disable_card_detection(host);
3494
3495         mmc_retune_timer_stop(host->mmc);
3496
3497         if (!device_may_wakeup(mmc_dev(host->mmc)) ||
3498             !sdhci_enable_irq_wakeups(host)) {
3499                 host->ier = 0;
3500                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3501                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3502                 free_irq(host->irq, host);
3503         }
3504
3505         return 0;
3506 }
3507
3508 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
3509
3510 int sdhci_resume_host(struct sdhci_host *host)
3511 {
3512         struct mmc_host *mmc = host->mmc;
3513         int ret = 0;
3514
3515         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3516                 if (host->ops->enable_dma)
3517                         host->ops->enable_dma(host);
3518         }
3519
3520         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
3521             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
3522                 /* Card keeps power but host controller does not */
3523                 sdhci_init(host, 0);
3524                 host->pwr = 0;
3525                 host->clock = 0;
3526                 mmc->ops->set_ios(mmc, &mmc->ios);
3527         } else {
3528                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
3529         }
3530
3531         if (host->irq_wake_enabled) {
3532                 sdhci_disable_irq_wakeups(host);
3533         } else {
3534                 ret = request_threaded_irq(host->irq, sdhci_irq,
3535                                            sdhci_thread_irq, IRQF_SHARED,
3536                                            mmc_hostname(host->mmc), host);
3537                 if (ret)
3538                         return ret;
3539         }
3540
3541         sdhci_enable_card_detection(host);
3542
3543         return ret;
3544 }
3545
3546 EXPORT_SYMBOL_GPL(sdhci_resume_host);
3547
3548 int sdhci_runtime_suspend_host(struct sdhci_host *host)
3549 {
3550         unsigned long flags;
3551
3552         mmc_retune_timer_stop(host->mmc);
3553
3554         spin_lock_irqsave(&host->lock, flags);
3555         host->ier &= SDHCI_INT_CARD_INT;
3556         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3557         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3558         spin_unlock_irqrestore(&host->lock, flags);
3559
3560         synchronize_hardirq(host->irq);
3561
3562         spin_lock_irqsave(&host->lock, flags);
3563         host->runtime_suspended = true;
3564         spin_unlock_irqrestore(&host->lock, flags);
3565
3566         return 0;
3567 }
3568 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
3569
3570 int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset)
3571 {
3572         struct mmc_host *mmc = host->mmc;
3573         unsigned long flags;
3574         int host_flags = host->flags;
3575
3576         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3577                 if (host->ops->enable_dma)
3578                         host->ops->enable_dma(host);
3579         }
3580
3581         sdhci_init(host, soft_reset);
3582
3583         if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
3584             mmc->ios.power_mode != MMC_POWER_OFF) {
3585                 /* Force clock and power re-program */
3586                 host->pwr = 0;
3587                 host->clock = 0;
3588                 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
3589                 mmc->ops->set_ios(mmc, &mmc->ios);
3590
3591                 if ((host_flags & SDHCI_PV_ENABLED) &&
3592                     !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
3593                         spin_lock_irqsave(&host->lock, flags);
3594                         sdhci_enable_preset_value(host, true);
3595                         spin_unlock_irqrestore(&host->lock, flags);
3596                 }
3597
3598                 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
3599                     mmc->ops->hs400_enhanced_strobe)
3600                         mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
3601         }
3602
3603         spin_lock_irqsave(&host->lock, flags);
3604
3605         host->runtime_suspended = false;
3606
3607         /* Enable SDIO IRQ */
3608         if (sdio_irq_claimed(mmc))
3609                 sdhci_enable_sdio_irq_nolock(host, true);
3610
3611         /* Enable Card Detection */
3612         sdhci_enable_card_detection(host);
3613
3614         spin_unlock_irqrestore(&host->lock, flags);
3615
3616         return 0;
3617 }
3618 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
3619
3620 #endif /* CONFIG_PM */
3621
3622 /*****************************************************************************\
3623  *                                                                           *
3624  * Command Queue Engine (CQE) helpers                                        *
3625  *                                                                           *
3626 \*****************************************************************************/
3627
3628 void sdhci_cqe_enable(struct mmc_host *mmc)
3629 {
3630         struct sdhci_host *host = mmc_priv(mmc);
3631         unsigned long flags;
3632         u8 ctrl;
3633
3634         spin_lock_irqsave(&host->lock, flags);
3635
3636         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
3637         ctrl &= ~SDHCI_CTRL_DMA_MASK;
3638         /*
3639          * Host from V4.10 supports ADMA3 DMA type.
3640          * ADMA3 performs integrated descriptor which is more suitable
3641          * for cmd queuing to fetch both command and transfer descriptors.
3642          */
3643         if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3))
3644                 ctrl |= SDHCI_CTRL_ADMA3;
3645         else if (host->flags & SDHCI_USE_64_BIT_DMA)
3646                 ctrl |= SDHCI_CTRL_ADMA64;
3647         else
3648                 ctrl |= SDHCI_CTRL_ADMA32;
3649         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
3650
3651         sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
3652                      SDHCI_BLOCK_SIZE);
3653
3654         /* Set maximum timeout */
3655         sdhci_set_timeout(host, NULL);
3656
3657         host->ier = host->cqe_ier;
3658
3659         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3660         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3661
3662         host->cqe_on = true;
3663
3664         pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
3665                  mmc_hostname(mmc), host->ier,
3666                  sdhci_readl(host, SDHCI_INT_STATUS));
3667
3668         spin_unlock_irqrestore(&host->lock, flags);
3669 }
3670 EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
3671
3672 void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
3673 {
3674         struct sdhci_host *host = mmc_priv(mmc);
3675         unsigned long flags;
3676
3677         spin_lock_irqsave(&host->lock, flags);
3678
3679         sdhci_set_default_irqs(host);
3680
3681         host->cqe_on = false;
3682
3683         if (recovery) {
3684                 sdhci_do_reset(host, SDHCI_RESET_CMD);
3685                 sdhci_do_reset(host, SDHCI_RESET_DATA);
3686         }
3687
3688         pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
3689                  mmc_hostname(mmc), host->ier,
3690                  sdhci_readl(host, SDHCI_INT_STATUS));
3691
3692         spin_unlock_irqrestore(&host->lock, flags);
3693 }
3694 EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
3695
3696 bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
3697                    int *data_error)
3698 {
3699         u32 mask;
3700
3701         if (!host->cqe_on)
3702                 return false;
3703
3704         if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
3705                 *cmd_error = -EILSEQ;
3706         else if (intmask & SDHCI_INT_TIMEOUT)
3707                 *cmd_error = -ETIMEDOUT;
3708         else
3709                 *cmd_error = 0;
3710
3711         if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
3712                 *data_error = -EILSEQ;
3713         else if (intmask & SDHCI_INT_DATA_TIMEOUT)
3714                 *data_error = -ETIMEDOUT;
3715         else if (intmask & SDHCI_INT_ADMA_ERROR)
3716                 *data_error = -EIO;
3717         else
3718                 *data_error = 0;
3719
3720         /* Clear selected interrupts. */
3721         mask = intmask & host->cqe_ier;
3722         sdhci_writel(host, mask, SDHCI_INT_STATUS);
3723
3724         if (intmask & SDHCI_INT_BUS_POWER)
3725                 pr_err("%s: Card is consuming too much power!\n",
3726                        mmc_hostname(host->mmc));
3727
3728         intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
3729         if (intmask) {
3730                 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3731                 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
3732                        mmc_hostname(host->mmc), intmask);
3733                 sdhci_dumpregs(host);
3734         }
3735
3736         return true;
3737 }
3738 EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
3739
3740 /*****************************************************************************\
3741  *                                                                           *
3742  * Device allocation/registration                                            *
3743  *                                                                           *
3744 \*****************************************************************************/
3745
3746 struct sdhci_host *sdhci_alloc_host(struct device *dev,
3747         size_t priv_size)
3748 {
3749         struct mmc_host *mmc;
3750         struct sdhci_host *host;
3751
3752         WARN_ON(dev == NULL);
3753
3754         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
3755         if (!mmc)
3756                 return ERR_PTR(-ENOMEM);
3757
3758         host = mmc_priv(mmc);
3759         host->mmc = mmc;
3760         host->mmc_host_ops = sdhci_ops;
3761         mmc->ops = &host->mmc_host_ops;
3762
3763         host->flags = SDHCI_SIGNALING_330;
3764
3765         host->cqe_ier     = SDHCI_CQE_INT_MASK;
3766         host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
3767
3768         host->tuning_delay = -1;
3769         host->tuning_loop_count = MAX_TUNING_LOOP;
3770
3771         host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
3772
3773         /*
3774          * The DMA table descriptor count is calculated as the maximum
3775          * number of segments times 2, to allow for an alignment
3776          * descriptor for each segment, plus 1 for a nop end descriptor.
3777          */
3778         host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
3779
3780         return host;
3781 }
3782
3783 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
3784
3785 static int sdhci_set_dma_mask(struct sdhci_host *host)
3786 {
3787         struct mmc_host *mmc = host->mmc;
3788         struct device *dev = mmc_dev(mmc);
3789         int ret = -EINVAL;
3790
3791         if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
3792                 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3793
3794         /* Try 64-bit mask if hardware is capable  of it */
3795         if (host->flags & SDHCI_USE_64_BIT_DMA) {
3796                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
3797                 if (ret) {
3798                         pr_warn("%s: Failed to set 64-bit DMA mask.\n",
3799                                 mmc_hostname(mmc));
3800                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
3801                 }
3802         }
3803
3804         /* 32-bit mask as default & fallback */
3805         if (ret) {
3806                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
3807                 if (ret)
3808                         pr_warn("%s: Failed to set 32-bit DMA mask.\n",
3809                                 mmc_hostname(mmc));
3810         }
3811
3812         return ret;
3813 }
3814
3815 void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver,
3816                        const u32 *caps, const u32 *caps1)
3817 {
3818         u16 v;
3819         u64 dt_caps_mask = 0;
3820         u64 dt_caps = 0;
3821
3822         if (host->read_caps)
3823                 return;
3824
3825         host->read_caps = true;
3826
3827         if (debug_quirks)
3828                 host->quirks = debug_quirks;
3829
3830         if (debug_quirks2)
3831                 host->quirks2 = debug_quirks2;
3832
3833         sdhci_do_reset(host, SDHCI_RESET_ALL);
3834
3835         if (host->v4_mode)
3836                 sdhci_do_enable_v4_mode(host);
3837
3838         of_property_read_u64(mmc_dev(host->mmc)->of_node,
3839                              "sdhci-caps-mask", &dt_caps_mask);
3840         of_property_read_u64(mmc_dev(host->mmc)->of_node,
3841                              "sdhci-caps", &dt_caps);
3842
3843         v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
3844         host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
3845
3846         if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
3847                 return;
3848
3849         if (caps) {
3850                 host->caps = *caps;
3851         } else {
3852                 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
3853                 host->caps &= ~lower_32_bits(dt_caps_mask);
3854                 host->caps |= lower_32_bits(dt_caps);
3855         }
3856
3857         if (host->version < SDHCI_SPEC_300)
3858                 return;
3859
3860         if (caps1) {
3861                 host->caps1 = *caps1;
3862         } else {
3863                 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
3864                 host->caps1 &= ~upper_32_bits(dt_caps_mask);
3865                 host->caps1 |= upper_32_bits(dt_caps);
3866         }
3867 }
3868 EXPORT_SYMBOL_GPL(__sdhci_read_caps);
3869
3870 static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
3871 {
3872         struct mmc_host *mmc = host->mmc;
3873         unsigned int max_blocks;
3874         unsigned int bounce_size;
3875         int ret;
3876
3877         /*
3878          * Cap the bounce buffer at 64KB. Using a bigger bounce buffer
3879          * has diminishing returns, this is probably because SD/MMC
3880          * cards are usually optimized to handle this size of requests.
3881          */
3882         bounce_size = SZ_64K;
3883         /*
3884          * Adjust downwards to maximum request size if this is less
3885          * than our segment size, else hammer down the maximum
3886          * request size to the maximum buffer size.
3887          */
3888         if (mmc->max_req_size < bounce_size)
3889                 bounce_size = mmc->max_req_size;
3890         max_blocks = bounce_size / 512;
3891
3892         /*
3893          * When we just support one segment, we can get significant
3894          * speedups by the help of a bounce buffer to group scattered
3895          * reads/writes together.
3896          */
3897         host->bounce_buffer = devm_kmalloc(mmc->parent,
3898                                            bounce_size,
3899                                            GFP_KERNEL);
3900         if (!host->bounce_buffer) {
3901                 pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n",
3902                        mmc_hostname(mmc),
3903                        bounce_size);
3904                 /*
3905                  * Exiting with zero here makes sure we proceed with
3906                  * mmc->max_segs == 1.
3907                  */
3908                 return;
3909         }
3910
3911         host->bounce_addr = dma_map_single(mmc->parent,
3912                                            host->bounce_buffer,
3913                                            bounce_size,
3914                                            DMA_BIDIRECTIONAL);
3915         ret = dma_mapping_error(mmc->parent, host->bounce_addr);
3916         if (ret)
3917                 /* Again fall back to max_segs == 1 */
3918                 return;
3919         host->bounce_buffer_size = bounce_size;
3920
3921         /* Lie about this since we're bouncing */
3922         mmc->max_segs = max_blocks;
3923         mmc->max_seg_size = bounce_size;
3924         mmc->max_req_size = bounce_size;
3925
3926         pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
3927                 mmc_hostname(mmc), max_blocks, bounce_size);
3928 }
3929
3930 static inline bool sdhci_can_64bit_dma(struct sdhci_host *host)
3931 {
3932         /*
3933          * According to SD Host Controller spec v4.10, bit[27] added from
3934          * version 4.10 in Capabilities Register is used as 64-bit System
3935          * Address support for V4 mode.
3936          */
3937         if (host->version >= SDHCI_SPEC_410 && host->v4_mode)
3938                 return host->caps & SDHCI_CAN_64BIT_V4;
3939
3940         return host->caps & SDHCI_CAN_64BIT;
3941 }
3942
3943 int sdhci_setup_host(struct sdhci_host *host)
3944 {
3945         struct mmc_host *mmc;
3946         u32 max_current_caps;
3947         unsigned int ocr_avail;
3948         unsigned int override_timeout_clk;
3949         u32 max_clk;
3950         int ret;
3951
3952         WARN_ON(host == NULL);
3953         if (host == NULL)
3954                 return -EINVAL;
3955
3956         mmc = host->mmc;
3957
3958         /*
3959          * If there are external regulators, get them. Note this must be done
3960          * early before resetting the host and reading the capabilities so that
3961          * the host can take the appropriate action if regulators are not
3962          * available.
3963          */
3964         ret = mmc_regulator_get_supply(mmc);
3965         if (ret)
3966                 return ret;
3967
3968         DBG("Version:   0x%08x | Present:  0x%08x\n",
3969             sdhci_readw(host, SDHCI_HOST_VERSION),
3970             sdhci_readl(host, SDHCI_PRESENT_STATE));
3971         DBG("Caps:      0x%08x | Caps_1:   0x%08x\n",
3972             sdhci_readl(host, SDHCI_CAPABILITIES),
3973             sdhci_readl(host, SDHCI_CAPABILITIES_1));
3974
3975         sdhci_read_caps(host);
3976
3977         override_timeout_clk = host->timeout_clk;
3978
3979         if (host->version > SDHCI_SPEC_420) {
3980                 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
3981                        mmc_hostname(mmc), host->version);
3982         }
3983
3984         if (host->quirks & SDHCI_QUIRK_BROKEN_CQE)
3985                 mmc->caps2 &= ~MMC_CAP2_CQE;
3986
3987         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
3988                 host->flags |= SDHCI_USE_SDMA;
3989         else if (!(host->caps & SDHCI_CAN_DO_SDMA))
3990                 DBG("Controller doesn't have SDMA capability\n");
3991         else
3992                 host->flags |= SDHCI_USE_SDMA;
3993
3994         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
3995                 (host->flags & SDHCI_USE_SDMA)) {
3996                 DBG("Disabling DMA as it is marked broken\n");
3997                 host->flags &= ~SDHCI_USE_SDMA;
3998         }
3999
4000         if ((host->version >= SDHCI_SPEC_200) &&
4001                 (host->caps & SDHCI_CAN_DO_ADMA2))
4002                 host->flags |= SDHCI_USE_ADMA;
4003
4004         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
4005                 (host->flags & SDHCI_USE_ADMA)) {
4006                 DBG("Disabling ADMA as it is marked broken\n");
4007                 host->flags &= ~SDHCI_USE_ADMA;
4008         }
4009
4010         if (sdhci_can_64bit_dma(host))
4011                 host->flags |= SDHCI_USE_64_BIT_DMA;
4012
4013         if (host->use_external_dma) {
4014                 ret = sdhci_external_dma_init(host);
4015                 if (ret == -EPROBE_DEFER)
4016                         goto unreg;
4017                 /*
4018                  * Fall back to use the DMA/PIO integrated in standard SDHCI
4019                  * instead of external DMA devices.
4020                  */
4021                 else if (ret)
4022                         sdhci_switch_external_dma(host, false);
4023                 /* Disable internal DMA sources */
4024                 else
4025                         host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4026         }
4027
4028         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
4029                 if (host->ops->set_dma_mask)
4030                         ret = host->ops->set_dma_mask(host);
4031                 else
4032                         ret = sdhci_set_dma_mask(host);
4033
4034                 if (!ret && host->ops->enable_dma)
4035                         ret = host->ops->enable_dma(host);
4036
4037                 if (ret) {
4038                         pr_warn("%s: No suitable DMA available - falling back to PIO\n",
4039                                 mmc_hostname(mmc));
4040                         host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4041
4042                         ret = 0;
4043                 }
4044         }
4045
4046         /* SDMA does not support 64-bit DMA if v4 mode not set */
4047         if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode)
4048                 host->flags &= ~SDHCI_USE_SDMA;
4049
4050         if (host->flags & SDHCI_USE_ADMA) {
4051                 dma_addr_t dma;
4052                 void *buf;
4053
4054                 if (!(host->flags & SDHCI_USE_64_BIT_DMA))
4055                         host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ;
4056                 else if (!host->alloc_desc_sz)
4057                         host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
4058
4059                 host->desc_sz = host->alloc_desc_sz;
4060                 host->adma_table_sz = host->adma_table_cnt * host->desc_sz;
4061
4062                 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
4063                 /*
4064                  * Use zalloc to zero the reserved high 32-bits of 128-bit
4065                  * descriptors so that they never need to be written.
4066                  */
4067                 buf = dma_alloc_coherent(mmc_dev(mmc),
4068                                          host->align_buffer_sz + host->adma_table_sz,
4069                                          &dma, GFP_KERNEL);
4070                 if (!buf) {
4071                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
4072                                 mmc_hostname(mmc));
4073                         host->flags &= ~SDHCI_USE_ADMA;
4074                 } else if ((dma + host->align_buffer_sz) &
4075                            (SDHCI_ADMA2_DESC_ALIGN - 1)) {
4076                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
4077                                 mmc_hostname(mmc));
4078                         host->flags &= ~SDHCI_USE_ADMA;
4079                         dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4080                                           host->adma_table_sz, buf, dma);
4081                 } else {
4082                         host->align_buffer = buf;
4083                         host->align_addr = dma;
4084
4085                         host->adma_table = buf + host->align_buffer_sz;
4086                         host->adma_addr = dma + host->align_buffer_sz;
4087                 }
4088         }
4089
4090         /*
4091          * If we use DMA, then it's up to the caller to set the DMA
4092          * mask, but PIO does not need the hw shim so we set a new
4093          * mask here in that case.
4094          */
4095         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
4096                 host->dma_mask = DMA_BIT_MASK(64);
4097                 mmc_dev(mmc)->dma_mask = &host->dma_mask;
4098         }
4099
4100         if (host->version >= SDHCI_SPEC_300)
4101                 host->max_clk = (host->caps & SDHCI_CLOCK_V3_BASE_MASK)
4102                         >> SDHCI_CLOCK_BASE_SHIFT;
4103         else
4104                 host->max_clk = (host->caps & SDHCI_CLOCK_BASE_MASK)
4105                         >> SDHCI_CLOCK_BASE_SHIFT;
4106
4107         host->max_clk *= 1000000;
4108         if (host->max_clk == 0 || host->quirks &
4109                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
4110                 if (!host->ops->get_max_clock) {
4111                         pr_err("%s: Hardware doesn't specify base clock frequency.\n",
4112                                mmc_hostname(mmc));
4113                         ret = -ENODEV;
4114                         goto undma;
4115                 }
4116                 host->max_clk = host->ops->get_max_clock(host);
4117         }
4118
4119         /*
4120          * In case of Host Controller v3.00, find out whether clock
4121          * multiplier is supported.
4122          */
4123         host->clk_mul = (host->caps1 & SDHCI_CLOCK_MUL_MASK) >>
4124                         SDHCI_CLOCK_MUL_SHIFT;
4125
4126         /*
4127          * In case the value in Clock Multiplier is 0, then programmable
4128          * clock mode is not supported, otherwise the actual clock
4129          * multiplier is one more than the value of Clock Multiplier
4130          * in the Capabilities Register.
4131          */
4132         if (host->clk_mul)
4133                 host->clk_mul += 1;
4134
4135         /*
4136          * Set host parameters.
4137          */
4138         max_clk = host->max_clk;
4139
4140         if (host->ops->get_min_clock)
4141                 mmc->f_min = host->ops->get_min_clock(host);
4142         else if (host->version >= SDHCI_SPEC_300) {
4143                 if (host->clk_mul)
4144                         max_clk = host->max_clk * host->clk_mul;
4145                 /*
4146                  * Divided Clock Mode minimum clock rate is always less than
4147                  * Programmable Clock Mode minimum clock rate.
4148                  */
4149                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
4150         } else
4151                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
4152
4153         if (!mmc->f_max || mmc->f_max > max_clk)
4154                 mmc->f_max = max_clk;
4155
4156         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
4157                 host->timeout_clk = (host->caps & SDHCI_TIMEOUT_CLK_MASK) >>
4158                                         SDHCI_TIMEOUT_CLK_SHIFT;
4159
4160                 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
4161                         host->timeout_clk *= 1000;
4162
4163                 if (host->timeout_clk == 0) {
4164                         if (!host->ops->get_timeout_clock) {
4165                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
4166                                         mmc_hostname(mmc));
4167                                 ret = -ENODEV;
4168                                 goto undma;
4169                         }
4170
4171                         host->timeout_clk =
4172                                 DIV_ROUND_UP(host->ops->get_timeout_clock(host),
4173                                              1000);
4174                 }
4175
4176                 if (override_timeout_clk)
4177                         host->timeout_clk = override_timeout_clk;
4178
4179                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
4180                         host->ops->get_max_timeout_count(host) : 1 << 27;
4181                 mmc->max_busy_timeout /= host->timeout_clk;
4182         }
4183
4184         if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT &&
4185             !host->ops->get_max_timeout_count)
4186                 mmc->max_busy_timeout = 0;
4187
4188         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
4189         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
4190
4191         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
4192                 host->flags |= SDHCI_AUTO_CMD12;
4193
4194         /*
4195          * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO.
4196          * For v4 mode, SDMA may use Auto-CMD23 as well.
4197          */
4198         if ((host->version >= SDHCI_SPEC_300) &&
4199             ((host->flags & SDHCI_USE_ADMA) ||
4200              !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
4201              !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
4202                 host->flags |= SDHCI_AUTO_CMD23;
4203                 DBG("Auto-CMD23 available\n");
4204         } else {
4205                 DBG("Auto-CMD23 unavailable\n");
4206         }
4207
4208         /*
4209          * A controller may support 8-bit width, but the board itself
4210          * might not have the pins brought out.  Boards that support
4211          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
4212          * their platform code before calling sdhci_add_host(), and we
4213          * won't assume 8-bit width for hosts without that CAP.
4214          */
4215         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
4216                 mmc->caps |= MMC_CAP_4_BIT_DATA;
4217
4218         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
4219                 mmc->caps &= ~MMC_CAP_CMD23;
4220
4221         if (host->caps & SDHCI_CAN_DO_HISPD)
4222                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
4223
4224         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
4225             mmc_card_is_removable(mmc) &&
4226             mmc_gpio_get_cd(host->mmc) < 0)
4227                 mmc->caps |= MMC_CAP_NEEDS_POLL;
4228
4229         if (!IS_ERR(mmc->supply.vqmmc)) {
4230                 ret = regulator_enable(mmc->supply.vqmmc);
4231
4232                 /* If vqmmc provides no 1.8V signalling, then there's no UHS */
4233                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
4234                                                     1950000))
4235                         host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
4236                                          SDHCI_SUPPORT_SDR50 |
4237                                          SDHCI_SUPPORT_DDR50);
4238
4239                 /* In eMMC case vqmmc might be a fixed 1.8V regulator */
4240                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
4241                                                     3600000))
4242                         host->flags &= ~SDHCI_SIGNALING_330;
4243
4244                 if (ret) {
4245                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
4246                                 mmc_hostname(mmc), ret);
4247                         mmc->supply.vqmmc = ERR_PTR(-EINVAL);
4248                 }
4249         }
4250
4251         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
4252                 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4253                                  SDHCI_SUPPORT_DDR50);
4254                 /*
4255                  * The SDHCI controller in a SoC might support HS200/HS400
4256                  * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property),
4257                  * but if the board is modeled such that the IO lines are not
4258                  * connected to 1.8v then HS200/HS400 cannot be supported.
4259                  * Disable HS200/HS400 if the board does not have 1.8v connected
4260                  * to the IO lines. (Applicable for other modes in 1.8v)
4261                  */
4262                 mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES);
4263                 mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS);
4264         }
4265
4266         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
4267         if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4268                            SDHCI_SUPPORT_DDR50))
4269                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
4270
4271         /* SDR104 supports also implies SDR50 support */
4272         if (host->caps1 & SDHCI_SUPPORT_SDR104) {
4273                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
4274                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
4275                  * field can be promoted to support HS200.
4276                  */
4277                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
4278                         mmc->caps2 |= MMC_CAP2_HS200;
4279         } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
4280                 mmc->caps |= MMC_CAP_UHS_SDR50;
4281         }
4282
4283         if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
4284             (host->caps1 & SDHCI_SUPPORT_HS400))
4285                 mmc->caps2 |= MMC_CAP2_HS400;
4286
4287         if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
4288             (IS_ERR(mmc->supply.vqmmc) ||
4289              !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
4290                                              1300000)))
4291                 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
4292
4293         if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
4294             !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
4295                 mmc->caps |= MMC_CAP_UHS_DDR50;
4296
4297         /* Does the host need tuning for SDR50? */
4298         if (host->caps1 & SDHCI_USE_SDR50_TUNING)
4299                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
4300
4301         /* Driver Type(s) (A, C, D) supported by the host */
4302         if (host->caps1 & SDHCI_DRIVER_TYPE_A)
4303                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
4304         if (host->caps1 & SDHCI_DRIVER_TYPE_C)
4305                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
4306         if (host->caps1 & SDHCI_DRIVER_TYPE_D)
4307                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
4308
4309         /* Initial value for re-tuning timer count */
4310         host->tuning_count = (host->caps1 & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
4311                              SDHCI_RETUNING_TIMER_COUNT_SHIFT;
4312
4313         /*
4314          * In case Re-tuning Timer is not disabled, the actual value of
4315          * re-tuning timer will be 2 ^ (n - 1).
4316          */
4317         if (host->tuning_count)
4318                 host->tuning_count = 1 << (host->tuning_count - 1);
4319
4320         /* Re-tuning mode supported by the Host Controller */
4321         host->tuning_mode = (host->caps1 & SDHCI_RETUNING_MODE_MASK) >>
4322                              SDHCI_RETUNING_MODE_SHIFT;
4323
4324         ocr_avail = 0;
4325
4326         /*
4327          * According to SD Host Controller spec v3.00, if the Host System
4328          * can afford more than 150mA, Host Driver should set XPC to 1. Also
4329          * the value is meaningful only if Voltage Support in the Capabilities
4330          * register is set. The actual current value is 4 times the register
4331          * value.
4332          */
4333         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
4334         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
4335                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
4336                 if (curr > 0) {
4337
4338                         /* convert to SDHCI_MAX_CURRENT format */
4339                         curr = curr/1000;  /* convert to mA */
4340                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
4341
4342                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
4343                         max_current_caps =
4344                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
4345                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
4346                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
4347                 }
4348         }
4349
4350         if (host->caps & SDHCI_CAN_VDD_330) {
4351                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
4352
4353                 mmc->max_current_330 = ((max_current_caps &
4354                                    SDHCI_MAX_CURRENT_330_MASK) >>
4355                                    SDHCI_MAX_CURRENT_330_SHIFT) *
4356                                    SDHCI_MAX_CURRENT_MULTIPLIER;
4357         }
4358         if (host->caps & SDHCI_CAN_VDD_300) {
4359                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
4360
4361                 mmc->max_current_300 = ((max_current_caps &
4362                                    SDHCI_MAX_CURRENT_300_MASK) >>
4363                                    SDHCI_MAX_CURRENT_300_SHIFT) *
4364                                    SDHCI_MAX_CURRENT_MULTIPLIER;
4365         }
4366         if (host->caps & SDHCI_CAN_VDD_180) {
4367                 ocr_avail |= MMC_VDD_165_195;
4368
4369                 mmc->max_current_180 = ((max_current_caps &
4370                                    SDHCI_MAX_CURRENT_180_MASK) >>
4371                                    SDHCI_MAX_CURRENT_180_SHIFT) *
4372                                    SDHCI_MAX_CURRENT_MULTIPLIER;
4373         }
4374
4375         /* If OCR set by host, use it instead. */
4376         if (host->ocr_mask)
4377                 ocr_avail = host->ocr_mask;
4378
4379         /* If OCR set by external regulators, give it highest prio. */
4380         if (mmc->ocr_avail)
4381                 ocr_avail = mmc->ocr_avail;
4382
4383         mmc->ocr_avail = ocr_avail;
4384         mmc->ocr_avail_sdio = ocr_avail;
4385         if (host->ocr_avail_sdio)
4386                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
4387         mmc->ocr_avail_sd = ocr_avail;
4388         if (host->ocr_avail_sd)
4389                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
4390         else /* normal SD controllers don't support 1.8V */
4391                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
4392         mmc->ocr_avail_mmc = ocr_avail;
4393         if (host->ocr_avail_mmc)
4394                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
4395
4396         if (mmc->ocr_avail == 0) {
4397                 pr_err("%s: Hardware doesn't report any support voltages.\n",
4398                        mmc_hostname(mmc));
4399                 ret = -ENODEV;
4400                 goto unreg;
4401         }
4402
4403         if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
4404                           MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
4405                           MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
4406             (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
4407                 host->flags |= SDHCI_SIGNALING_180;
4408
4409         if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
4410                 host->flags |= SDHCI_SIGNALING_120;
4411
4412         spin_lock_init(&host->lock);
4413
4414         /*
4415          * Maximum number of sectors in one transfer. Limited by SDMA boundary
4416          * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
4417          * is less anyway.
4418          */
4419         mmc->max_req_size = 524288;
4420
4421         /*
4422          * Maximum number of segments. Depends on if the hardware
4423          * can do scatter/gather or not.
4424          */
4425         if (host->flags & SDHCI_USE_ADMA) {
4426                 mmc->max_segs = SDHCI_MAX_SEGS;
4427         } else if (host->flags & SDHCI_USE_SDMA) {
4428                 mmc->max_segs = 1;
4429                 if (swiotlb_max_segment()) {
4430                         unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
4431                                                 IO_TLB_SEGSIZE;
4432                         mmc->max_req_size = min(mmc->max_req_size,
4433                                                 max_req_size);
4434                 }
4435         } else { /* PIO */
4436                 mmc->max_segs = SDHCI_MAX_SEGS;
4437         }
4438
4439         /*
4440          * Maximum segment size. Could be one segment with the maximum number
4441          * of bytes. When doing hardware scatter/gather, each entry cannot
4442          * be larger than 64 KiB though.
4443          */
4444         if (host->flags & SDHCI_USE_ADMA) {
4445                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
4446                         mmc->max_seg_size = 65535;
4447                 else
4448                         mmc->max_seg_size = 65536;
4449         } else {
4450                 mmc->max_seg_size = mmc->max_req_size;
4451         }
4452
4453         /*
4454          * Maximum block size. This varies from controller to controller and
4455          * is specified in the capabilities register.
4456          */
4457         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
4458                 mmc->max_blk_size = 2;
4459         } else {
4460                 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
4461                                 SDHCI_MAX_BLOCK_SHIFT;
4462                 if (mmc->max_blk_size >= 3) {
4463                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
4464                                 mmc_hostname(mmc));
4465                         mmc->max_blk_size = 0;
4466                 }
4467         }
4468
4469         mmc->max_blk_size = 512 << mmc->max_blk_size;
4470
4471         /*
4472          * Maximum block count.
4473          */
4474         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
4475
4476         if (mmc->max_segs == 1)
4477                 /* This may alter mmc->*_blk_* parameters */
4478                 sdhci_allocate_bounce_buffer(host);
4479
4480         return 0;
4481
4482 unreg:
4483         if (!IS_ERR(mmc->supply.vqmmc))
4484                 regulator_disable(mmc->supply.vqmmc);
4485 undma:
4486         if (host->align_buffer)
4487                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4488                                   host->adma_table_sz, host->align_buffer,
4489                                   host->align_addr);
4490         host->adma_table = NULL;
4491         host->align_buffer = NULL;
4492
4493         return ret;
4494 }
4495 EXPORT_SYMBOL_GPL(sdhci_setup_host);
4496
4497 void sdhci_cleanup_host(struct sdhci_host *host)
4498 {
4499         struct mmc_host *mmc = host->mmc;
4500
4501         if (!IS_ERR(mmc->supply.vqmmc))
4502                 regulator_disable(mmc->supply.vqmmc);
4503
4504         if (host->align_buffer)
4505                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4506                                   host->adma_table_sz, host->align_buffer,
4507                                   host->align_addr);
4508
4509         if (host->use_external_dma)
4510                 sdhci_external_dma_release(host);
4511
4512         host->adma_table = NULL;
4513         host->align_buffer = NULL;
4514 }
4515 EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
4516
4517 int __sdhci_add_host(struct sdhci_host *host)
4518 {
4519         unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
4520         struct mmc_host *mmc = host->mmc;
4521         int ret;
4522
4523         host->complete_wq = alloc_workqueue("sdhci", flags, 0);
4524         if (!host->complete_wq)
4525                 return -ENOMEM;
4526
4527         INIT_WORK(&host->complete_work, sdhci_complete_work);
4528
4529         timer_setup(&host->timer, sdhci_timeout_timer, 0);
4530         timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
4531
4532         init_waitqueue_head(&host->buf_ready_int);
4533
4534         sdhci_init(host, 0);
4535
4536         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
4537                                    IRQF_SHARED, mmc_hostname(mmc), host);
4538         if (ret) {
4539                 pr_err("%s: Failed to request IRQ %d: %d\n",
4540                        mmc_hostname(mmc), host->irq, ret);
4541                 goto unwq;
4542         }
4543
4544         ret = sdhci_led_register(host);
4545         if (ret) {
4546                 pr_err("%s: Failed to register LED device: %d\n",
4547                        mmc_hostname(mmc), ret);
4548                 goto unirq;
4549         }
4550
4551         ret = mmc_add_host(mmc);
4552         if (ret)
4553                 goto unled;
4554
4555         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
4556                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
4557                 host->use_external_dma ? "External DMA" :
4558                 (host->flags & SDHCI_USE_ADMA) ?
4559                 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
4560                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
4561
4562         sdhci_enable_card_detection(host);
4563
4564         return 0;
4565
4566 unled:
4567         sdhci_led_unregister(host);
4568 unirq:
4569         sdhci_do_reset(host, SDHCI_RESET_ALL);
4570         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4571         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4572         free_irq(host->irq, host);
4573 unwq:
4574         destroy_workqueue(host->complete_wq);
4575
4576         return ret;
4577 }
4578 EXPORT_SYMBOL_GPL(__sdhci_add_host);
4579
4580 int sdhci_add_host(struct sdhci_host *host)
4581 {
4582         int ret;
4583
4584         ret = sdhci_setup_host(host);
4585         if (ret)
4586                 return ret;
4587
4588         ret = __sdhci_add_host(host);
4589         if (ret)
4590                 goto cleanup;
4591
4592         return 0;
4593
4594 cleanup:
4595         sdhci_cleanup_host(host);
4596
4597         return ret;
4598 }
4599 EXPORT_SYMBOL_GPL(sdhci_add_host);
4600
4601 void sdhci_remove_host(struct sdhci_host *host, int dead)
4602 {
4603         struct mmc_host *mmc = host->mmc;
4604         unsigned long flags;
4605
4606         if (dead) {
4607                 spin_lock_irqsave(&host->lock, flags);
4608
4609                 host->flags |= SDHCI_DEVICE_DEAD;
4610
4611                 if (sdhci_has_requests(host)) {
4612                         pr_err("%s: Controller removed during "
4613                                 " transfer!\n", mmc_hostname(mmc));
4614                         sdhci_error_out_mrqs(host, -ENOMEDIUM);
4615                 }
4616
4617                 spin_unlock_irqrestore(&host->lock, flags);
4618         }
4619
4620         sdhci_disable_card_detection(host);
4621
4622         mmc_remove_host(mmc);
4623
4624         sdhci_led_unregister(host);
4625
4626         if (!dead)
4627                 sdhci_do_reset(host, SDHCI_RESET_ALL);
4628
4629         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4630         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4631         free_irq(host->irq, host);
4632
4633         del_timer_sync(&host->timer);
4634         del_timer_sync(&host->data_timer);
4635
4636         destroy_workqueue(host->complete_wq);
4637
4638         if (!IS_ERR(mmc->supply.vqmmc))
4639                 regulator_disable(mmc->supply.vqmmc);
4640
4641         if (host->align_buffer)
4642                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4643                                   host->adma_table_sz, host->align_buffer,
4644                                   host->align_addr);
4645
4646         if (host->use_external_dma)
4647                 sdhci_external_dma_release(host);
4648
4649         host->adma_table = NULL;
4650         host->align_buffer = NULL;
4651 }
4652
4653 EXPORT_SYMBOL_GPL(sdhci_remove_host);
4654
4655 void sdhci_free_host(struct sdhci_host *host)
4656 {
4657         mmc_free_host(host->mmc);
4658 }
4659
4660 EXPORT_SYMBOL_GPL(sdhci_free_host);
4661
4662 /*****************************************************************************\
4663  *                                                                           *
4664  * Driver init/exit                                                          *
4665  *                                                                           *
4666 \*****************************************************************************/
4667
4668 static int __init sdhci_drv_init(void)
4669 {
4670         pr_info(DRIVER_NAME
4671                 ": Secure Digital Host Controller Interface driver\n");
4672         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
4673
4674         return 0;
4675 }
4676
4677 static void __exit sdhci_drv_exit(void)
4678 {
4679 }
4680
4681 module_init(sdhci_drv_init);
4682 module_exit(sdhci_drv_exit);
4683
4684 module_param(debug_quirks, uint, 0444);
4685 module_param(debug_quirks2, uint, 0444);
4686
4687 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
4688 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
4689 MODULE_LICENSE("GPL");
4690
4691 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
4692 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");