1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver 4 * 5 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. 6 * 7 * Thanks to the following companies for their support: 8 * 9 * - JMicron (hardware and technical support) 10 */ 11 12 #include <linux/bitfield.h> 13 #include <linux/delay.h> 14 #include <linux/dmaengine.h> 15 #include <linux/ktime.h> 16 #include <linux/highmem.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/slab.h> 21 #include <linux/scatterlist.h> 22 #include <linux/sizes.h> 23 #include <linux/regulator/consumer.h> 24 #include <linux/pm_runtime.h> 25 #include <linux/of.h> 26 27 #include <linux/leds.h> 28 29 #include <linux/mmc/mmc.h> 30 #include <linux/mmc/host.h> 31 #include <linux/mmc/card.h> 32 #include <linux/mmc/sdio.h> 33 #include <linux/mmc/slot-gpio.h> 34 35 #include "sdhci.h" 36 37 #define DRIVER_NAME "sdhci" 38 39 #define DBG(f, x...) \ 40 pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x) 41 42 #define SDHCI_DUMP(f, x...) \ 43 pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x) 44 45 #define MAX_TUNING_LOOP 40 46 47 static unsigned int debug_quirks = 0; 48 static unsigned int debug_quirks2; 49 50 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable); 51 52 static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd); 53 54 void sdhci_dumpregs(struct sdhci_host *host) 55 { 56 SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n"); 57 58 SDHCI_DUMP("Sys addr: 0x%08x | Version: 0x%08x\n", 59 sdhci_readl(host, SDHCI_DMA_ADDRESS), 60 sdhci_readw(host, SDHCI_HOST_VERSION)); 61 SDHCI_DUMP("Blk size: 0x%08x | Blk cnt: 0x%08x\n", 62 sdhci_readw(host, SDHCI_BLOCK_SIZE), 63 sdhci_readw(host, SDHCI_BLOCK_COUNT)); 64 SDHCI_DUMP("Argument: 0x%08x | Trn mode: 0x%08x\n", 65 sdhci_readl(host, SDHCI_ARGUMENT), 66 sdhci_readw(host, SDHCI_TRANSFER_MODE)); 67 SDHCI_DUMP("Present: 0x%08x | Host ctl: 0x%08x\n", 68 sdhci_readl(host, SDHCI_PRESENT_STATE), 69 sdhci_readb(host, SDHCI_HOST_CONTROL)); 70 SDHCI_DUMP("Power: 0x%08x | Blk gap: 0x%08x\n", 71 sdhci_readb(host, SDHCI_POWER_CONTROL), 72 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL)); 73 SDHCI_DUMP("Wake-up: 0x%08x | Clock: 0x%08x\n", 74 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL), 75 sdhci_readw(host, SDHCI_CLOCK_CONTROL)); 76 SDHCI_DUMP("Timeout: 0x%08x | Int stat: 0x%08x\n", 77 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL), 78 sdhci_readl(host, SDHCI_INT_STATUS)); 79 SDHCI_DUMP("Int enab: 0x%08x | Sig enab: 0x%08x\n", 80 sdhci_readl(host, SDHCI_INT_ENABLE), 81 sdhci_readl(host, SDHCI_SIGNAL_ENABLE)); 82 SDHCI_DUMP("ACmd stat: 0x%08x | Slot int: 0x%08x\n", 83 sdhci_readw(host, SDHCI_AUTO_CMD_STATUS), 84 sdhci_readw(host, SDHCI_SLOT_INT_STATUS)); 85 SDHCI_DUMP("Caps: 0x%08x | Caps_1: 0x%08x\n", 86 sdhci_readl(host, SDHCI_CAPABILITIES), 87 sdhci_readl(host, SDHCI_CAPABILITIES_1)); 88 SDHCI_DUMP("Cmd: 0x%08x | Max curr: 0x%08x\n", 89 sdhci_readw(host, SDHCI_COMMAND), 90 sdhci_readl(host, SDHCI_MAX_CURRENT)); 91 SDHCI_DUMP("Resp[0]: 0x%08x | Resp[1]: 0x%08x\n", 92 sdhci_readl(host, SDHCI_RESPONSE), 93 sdhci_readl(host, SDHCI_RESPONSE + 4)); 94 SDHCI_DUMP("Resp[2]: 0x%08x | Resp[3]: 0x%08x\n", 95 sdhci_readl(host, SDHCI_RESPONSE + 8), 96 sdhci_readl(host, SDHCI_RESPONSE + 12)); 97 SDHCI_DUMP("Host ctl2: 0x%08x\n", 98 sdhci_readw(host, SDHCI_HOST_CONTROL2)); 99 100 if (host->flags & SDHCI_USE_ADMA) { 101 if (host->flags & SDHCI_USE_64_BIT_DMA) { 102 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n", 103 sdhci_readl(host, SDHCI_ADMA_ERROR), 104 sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI), 105 sdhci_readl(host, SDHCI_ADMA_ADDRESS)); 106 } else { 107 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n", 108 sdhci_readl(host, SDHCI_ADMA_ERROR), 109 sdhci_readl(host, SDHCI_ADMA_ADDRESS)); 110 } 111 } 112 113 if (host->ops->dump_vendor_regs) 114 host->ops->dump_vendor_regs(host); 115 116 SDHCI_DUMP("============================================\n"); 117 } 118 EXPORT_SYMBOL_GPL(sdhci_dumpregs); 119 120 /*****************************************************************************\ 121 * * 122 * Low level functions * 123 * * 124 \*****************************************************************************/ 125 126 static void sdhci_do_enable_v4_mode(struct sdhci_host *host) 127 { 128 u16 ctrl2; 129 130 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 131 if (ctrl2 & SDHCI_CTRL_V4_MODE) 132 return; 133 134 ctrl2 |= SDHCI_CTRL_V4_MODE; 135 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); 136 } 137 138 /* 139 * This can be called before sdhci_add_host() by Vendor's host controller 140 * driver to enable v4 mode if supported. 141 */ 142 void sdhci_enable_v4_mode(struct sdhci_host *host) 143 { 144 host->v4_mode = true; 145 sdhci_do_enable_v4_mode(host); 146 } 147 EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode); 148 149 static inline bool sdhci_data_line_cmd(struct mmc_command *cmd) 150 { 151 return cmd->data || cmd->flags & MMC_RSP_BUSY; 152 } 153 154 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable) 155 { 156 u32 present; 157 158 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) || 159 !mmc_card_is_removable(host->mmc) || mmc_can_gpio_cd(host->mmc)) 160 return; 161 162 if (enable) { 163 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 164 SDHCI_CARD_PRESENT; 165 166 host->ier |= present ? SDHCI_INT_CARD_REMOVE : 167 SDHCI_INT_CARD_INSERT; 168 } else { 169 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT); 170 } 171 172 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 173 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 174 } 175 176 static void sdhci_enable_card_detection(struct sdhci_host *host) 177 { 178 sdhci_set_card_detection(host, true); 179 } 180 181 static void sdhci_disable_card_detection(struct sdhci_host *host) 182 { 183 sdhci_set_card_detection(host, false); 184 } 185 186 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) 187 { 188 if (host->bus_on) 189 return; 190 host->bus_on = true; 191 pm_runtime_get_noresume(mmc_dev(host->mmc)); 192 } 193 194 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) 195 { 196 if (!host->bus_on) 197 return; 198 host->bus_on = false; 199 pm_runtime_put_noidle(mmc_dev(host->mmc)); 200 } 201 202 void sdhci_reset(struct sdhci_host *host, u8 mask) 203 { 204 ktime_t timeout; 205 206 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET); 207 208 if (mask & SDHCI_RESET_ALL) { 209 host->clock = 0; 210 /* Reset-all turns off SD Bus Power */ 211 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 212 sdhci_runtime_pm_bus_off(host); 213 } 214 215 /* Wait max 100 ms */ 216 timeout = ktime_add_ms(ktime_get(), 100); 217 218 /* hw clears the bit when it's done */ 219 while (1) { 220 bool timedout = ktime_after(ktime_get(), timeout); 221 222 if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)) 223 break; 224 if (timedout) { 225 pr_err("%s: Reset 0x%x never completed.\n", 226 mmc_hostname(host->mmc), (int)mask); 227 sdhci_err_stats_inc(host, CTRL_TIMEOUT); 228 sdhci_dumpregs(host); 229 return; 230 } 231 udelay(10); 232 } 233 } 234 EXPORT_SYMBOL_GPL(sdhci_reset); 235 236 static bool sdhci_do_reset(struct sdhci_host *host, u8 mask) 237 { 238 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) { 239 struct mmc_host *mmc = host->mmc; 240 241 if (!mmc->ops->get_cd(mmc)) 242 return false; 243 } 244 245 host->ops->reset(host, mask); 246 247 return true; 248 } 249 250 static void sdhci_reset_for_all(struct sdhci_host *host) 251 { 252 if (sdhci_do_reset(host, SDHCI_RESET_ALL)) { 253 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 254 if (host->ops->enable_dma) 255 host->ops->enable_dma(host); 256 } 257 /* Resetting the controller clears many */ 258 host->preset_enabled = false; 259 } 260 } 261 262 enum sdhci_reset_reason { 263 SDHCI_RESET_FOR_INIT, 264 SDHCI_RESET_FOR_REQUEST_ERROR, 265 SDHCI_RESET_FOR_REQUEST_ERROR_DATA_ONLY, 266 SDHCI_RESET_FOR_TUNING_ABORT, 267 SDHCI_RESET_FOR_CARD_REMOVED, 268 SDHCI_RESET_FOR_CQE_RECOVERY, 269 }; 270 271 static void sdhci_reset_for_reason(struct sdhci_host *host, enum sdhci_reset_reason reason) 272 { 273 if (host->quirks2 & SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER) { 274 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 275 return; 276 } 277 278 switch (reason) { 279 case SDHCI_RESET_FOR_INIT: 280 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 281 break; 282 case SDHCI_RESET_FOR_REQUEST_ERROR: 283 case SDHCI_RESET_FOR_TUNING_ABORT: 284 case SDHCI_RESET_FOR_CARD_REMOVED: 285 case SDHCI_RESET_FOR_CQE_RECOVERY: 286 sdhci_do_reset(host, SDHCI_RESET_CMD); 287 sdhci_do_reset(host, SDHCI_RESET_DATA); 288 break; 289 case SDHCI_RESET_FOR_REQUEST_ERROR_DATA_ONLY: 290 sdhci_do_reset(host, SDHCI_RESET_DATA); 291 break; 292 } 293 } 294 295 #define sdhci_reset_for(h, r) sdhci_reset_for_reason((h), SDHCI_RESET_FOR_##r) 296 297 static void sdhci_set_default_irqs(struct sdhci_host *host) 298 { 299 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT | 300 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | 301 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC | 302 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END | 303 SDHCI_INT_RESPONSE; 304 305 if (host->tuning_mode == SDHCI_TUNING_MODE_2 || 306 host->tuning_mode == SDHCI_TUNING_MODE_3) 307 host->ier |= SDHCI_INT_RETUNE; 308 309 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 310 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 311 } 312 313 static void sdhci_config_dma(struct sdhci_host *host) 314 { 315 u8 ctrl; 316 u16 ctrl2; 317 318 if (host->version < SDHCI_SPEC_200) 319 return; 320 321 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 322 323 /* 324 * Always adjust the DMA selection as some controllers 325 * (e.g. JMicron) can't do PIO properly when the selection 326 * is ADMA. 327 */ 328 ctrl &= ~SDHCI_CTRL_DMA_MASK; 329 if (!(host->flags & SDHCI_REQ_USE_DMA)) 330 goto out; 331 332 /* Note if DMA Select is zero then SDMA is selected */ 333 if (host->flags & SDHCI_USE_ADMA) 334 ctrl |= SDHCI_CTRL_ADMA32; 335 336 if (host->flags & SDHCI_USE_64_BIT_DMA) { 337 /* 338 * If v4 mode, all supported DMA can be 64-bit addressing if 339 * controller supports 64-bit system address, otherwise only 340 * ADMA can support 64-bit addressing. 341 */ 342 if (host->v4_mode) { 343 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 344 ctrl2 |= SDHCI_CTRL_64BIT_ADDR; 345 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); 346 } else if (host->flags & SDHCI_USE_ADMA) { 347 /* 348 * Don't need to undo SDHCI_CTRL_ADMA32 in order to 349 * set SDHCI_CTRL_ADMA64. 350 */ 351 ctrl |= SDHCI_CTRL_ADMA64; 352 } 353 } 354 355 out: 356 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 357 } 358 359 static void sdhci_init(struct sdhci_host *host, int soft) 360 { 361 struct mmc_host *mmc = host->mmc; 362 unsigned long flags; 363 364 if (soft) 365 sdhci_reset_for(host, INIT); 366 else 367 sdhci_reset_for_all(host); 368 369 if (host->v4_mode) 370 sdhci_do_enable_v4_mode(host); 371 372 spin_lock_irqsave(&host->lock, flags); 373 sdhci_set_default_irqs(host); 374 spin_unlock_irqrestore(&host->lock, flags); 375 376 host->cqe_on = false; 377 378 if (soft) { 379 /* force clock reconfiguration */ 380 host->clock = 0; 381 host->reinit_uhs = true; 382 mmc->ops->set_ios(mmc, &mmc->ios); 383 } 384 } 385 386 static void sdhci_reinit(struct sdhci_host *host) 387 { 388 u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT); 389 390 sdhci_init(host, 0); 391 sdhci_enable_card_detection(host); 392 393 /* 394 * A change to the card detect bits indicates a change in present state, 395 * refer sdhci_set_card_detection(). A card detect interrupt might have 396 * been missed while the host controller was being reset, so trigger a 397 * rescan to check. 398 */ 399 if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT))) 400 mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 401 } 402 403 static void __sdhci_led_activate(struct sdhci_host *host) 404 { 405 u8 ctrl; 406 407 if (host->quirks & SDHCI_QUIRK_NO_LED) 408 return; 409 410 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 411 ctrl |= SDHCI_CTRL_LED; 412 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 413 } 414 415 static void __sdhci_led_deactivate(struct sdhci_host *host) 416 { 417 u8 ctrl; 418 419 if (host->quirks & SDHCI_QUIRK_NO_LED) 420 return; 421 422 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 423 ctrl &= ~SDHCI_CTRL_LED; 424 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 425 } 426 427 #if IS_REACHABLE(CONFIG_LEDS_CLASS) 428 static void sdhci_led_control(struct led_classdev *led, 429 enum led_brightness brightness) 430 { 431 struct sdhci_host *host = container_of(led, struct sdhci_host, led); 432 unsigned long flags; 433 434 spin_lock_irqsave(&host->lock, flags); 435 436 if (host->runtime_suspended) 437 goto out; 438 439 if (brightness == LED_OFF) 440 __sdhci_led_deactivate(host); 441 else 442 __sdhci_led_activate(host); 443 out: 444 spin_unlock_irqrestore(&host->lock, flags); 445 } 446 447 static int sdhci_led_register(struct sdhci_host *host) 448 { 449 struct mmc_host *mmc = host->mmc; 450 451 if (host->quirks & SDHCI_QUIRK_NO_LED) 452 return 0; 453 454 snprintf(host->led_name, sizeof(host->led_name), 455 "%s::", mmc_hostname(mmc)); 456 457 host->led.name = host->led_name; 458 host->led.brightness = LED_OFF; 459 host->led.default_trigger = mmc_hostname(mmc); 460 host->led.brightness_set = sdhci_led_control; 461 462 return led_classdev_register(mmc_dev(mmc), &host->led); 463 } 464 465 static void sdhci_led_unregister(struct sdhci_host *host) 466 { 467 if (host->quirks & SDHCI_QUIRK_NO_LED) 468 return; 469 470 led_classdev_unregister(&host->led); 471 } 472 473 static inline void sdhci_led_activate(struct sdhci_host *host) 474 { 475 } 476 477 static inline void sdhci_led_deactivate(struct sdhci_host *host) 478 { 479 } 480 481 #else 482 483 static inline int sdhci_led_register(struct sdhci_host *host) 484 { 485 return 0; 486 } 487 488 static inline void sdhci_led_unregister(struct sdhci_host *host) 489 { 490 } 491 492 static inline void sdhci_led_activate(struct sdhci_host *host) 493 { 494 __sdhci_led_activate(host); 495 } 496 497 static inline void sdhci_led_deactivate(struct sdhci_host *host) 498 { 499 __sdhci_led_deactivate(host); 500 } 501 502 #endif 503 504 static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq, 505 unsigned long timeout) 506 { 507 if (sdhci_data_line_cmd(mrq->cmd)) 508 mod_timer(&host->data_timer, timeout); 509 else 510 mod_timer(&host->timer, timeout); 511 } 512 513 static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq) 514 { 515 if (sdhci_data_line_cmd(mrq->cmd)) 516 del_timer(&host->data_timer); 517 else 518 del_timer(&host->timer); 519 } 520 521 static inline bool sdhci_has_requests(struct sdhci_host *host) 522 { 523 return host->cmd || host->data_cmd; 524 } 525 526 /*****************************************************************************\ 527 * * 528 * Core functions * 529 * * 530 \*****************************************************************************/ 531 532 static void sdhci_read_block_pio(struct sdhci_host *host) 533 { 534 size_t blksize, len, chunk; 535 u32 scratch; 536 u8 *buf; 537 538 DBG("PIO reading\n"); 539 540 blksize = host->data->blksz; 541 chunk = 0; 542 543 while (blksize) { 544 BUG_ON(!sg_miter_next(&host->sg_miter)); 545 546 len = min(host->sg_miter.length, blksize); 547 548 blksize -= len; 549 host->sg_miter.consumed = len; 550 551 buf = host->sg_miter.addr; 552 553 while (len) { 554 if (chunk == 0) { 555 scratch = sdhci_readl(host, SDHCI_BUFFER); 556 chunk = 4; 557 } 558 559 *buf = scratch & 0xFF; 560 561 buf++; 562 scratch >>= 8; 563 chunk--; 564 len--; 565 } 566 } 567 568 sg_miter_stop(&host->sg_miter); 569 } 570 571 static void sdhci_write_block_pio(struct sdhci_host *host) 572 { 573 size_t blksize, len, chunk; 574 u32 scratch; 575 u8 *buf; 576 577 DBG("PIO writing\n"); 578 579 blksize = host->data->blksz; 580 chunk = 0; 581 scratch = 0; 582 583 while (blksize) { 584 BUG_ON(!sg_miter_next(&host->sg_miter)); 585 586 len = min(host->sg_miter.length, blksize); 587 588 blksize -= len; 589 host->sg_miter.consumed = len; 590 591 buf = host->sg_miter.addr; 592 593 while (len) { 594 scratch |= (u32)*buf << (chunk * 8); 595 596 buf++; 597 chunk++; 598 len--; 599 600 if ((chunk == 4) || ((len == 0) && (blksize == 0))) { 601 sdhci_writel(host, scratch, SDHCI_BUFFER); 602 chunk = 0; 603 scratch = 0; 604 } 605 } 606 } 607 608 sg_miter_stop(&host->sg_miter); 609 } 610 611 static void sdhci_transfer_pio(struct sdhci_host *host) 612 { 613 u32 mask; 614 615 if (host->blocks == 0) 616 return; 617 618 if (host->data->flags & MMC_DATA_READ) 619 mask = SDHCI_DATA_AVAILABLE; 620 else 621 mask = SDHCI_SPACE_AVAILABLE; 622 623 /* 624 * Some controllers (JMicron JMB38x) mess up the buffer bits 625 * for transfers < 4 bytes. As long as it is just one block, 626 * we can ignore the bits. 627 */ 628 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) && 629 (host->data->blocks == 1)) 630 mask = ~0; 631 632 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { 633 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY) 634 udelay(100); 635 636 if (host->data->flags & MMC_DATA_READ) 637 sdhci_read_block_pio(host); 638 else 639 sdhci_write_block_pio(host); 640 641 host->blocks--; 642 if (host->blocks == 0) 643 break; 644 } 645 646 DBG("PIO transfer complete.\n"); 647 } 648 649 static int sdhci_pre_dma_transfer(struct sdhci_host *host, 650 struct mmc_data *data, int cookie) 651 { 652 int sg_count; 653 654 /* 655 * If the data buffers are already mapped, return the previous 656 * dma_map_sg() result. 657 */ 658 if (data->host_cookie == COOKIE_PRE_MAPPED) 659 return data->sg_count; 660 661 /* Bounce write requests to the bounce buffer */ 662 if (host->bounce_buffer) { 663 unsigned int length = data->blksz * data->blocks; 664 665 if (length > host->bounce_buffer_size) { 666 pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n", 667 mmc_hostname(host->mmc), length, 668 host->bounce_buffer_size); 669 return -EIO; 670 } 671 if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) { 672 /* Copy the data to the bounce buffer */ 673 if (host->ops->copy_to_bounce_buffer) { 674 host->ops->copy_to_bounce_buffer(host, 675 data, length); 676 } else { 677 sg_copy_to_buffer(data->sg, data->sg_len, 678 host->bounce_buffer, length); 679 } 680 } 681 /* Switch ownership to the DMA */ 682 dma_sync_single_for_device(mmc_dev(host->mmc), 683 host->bounce_addr, 684 host->bounce_buffer_size, 685 mmc_get_dma_dir(data)); 686 /* Just a dummy value */ 687 sg_count = 1; 688 } else { 689 /* Just access the data directly from memory */ 690 sg_count = dma_map_sg(mmc_dev(host->mmc), 691 data->sg, data->sg_len, 692 mmc_get_dma_dir(data)); 693 } 694 695 if (sg_count == 0) 696 return -ENOSPC; 697 698 data->sg_count = sg_count; 699 data->host_cookie = cookie; 700 701 return sg_count; 702 } 703 704 static char *sdhci_kmap_atomic(struct scatterlist *sg) 705 { 706 return kmap_local_page(sg_page(sg)) + sg->offset; 707 } 708 709 static void sdhci_kunmap_atomic(void *buffer) 710 { 711 kunmap_local(buffer); 712 } 713 714 void sdhci_adma_write_desc(struct sdhci_host *host, void **desc, 715 dma_addr_t addr, int len, unsigned int cmd) 716 { 717 struct sdhci_adma2_64_desc *dma_desc = *desc; 718 719 /* 32-bit and 64-bit descriptors have these members in same position */ 720 dma_desc->cmd = cpu_to_le16(cmd); 721 dma_desc->len = cpu_to_le16(len); 722 dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr)); 723 724 if (host->flags & SDHCI_USE_64_BIT_DMA) 725 dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr)); 726 727 *desc += host->desc_sz; 728 } 729 EXPORT_SYMBOL_GPL(sdhci_adma_write_desc); 730 731 static inline void __sdhci_adma_write_desc(struct sdhci_host *host, 732 void **desc, dma_addr_t addr, 733 int len, unsigned int cmd) 734 { 735 if (host->ops->adma_write_desc) 736 host->ops->adma_write_desc(host, desc, addr, len, cmd); 737 else 738 sdhci_adma_write_desc(host, desc, addr, len, cmd); 739 } 740 741 static void sdhci_adma_mark_end(void *desc) 742 { 743 struct sdhci_adma2_64_desc *dma_desc = desc; 744 745 /* 32-bit and 64-bit descriptors have 'cmd' in same position */ 746 dma_desc->cmd |= cpu_to_le16(ADMA2_END); 747 } 748 749 static void sdhci_adma_table_pre(struct sdhci_host *host, 750 struct mmc_data *data, int sg_count) 751 { 752 struct scatterlist *sg; 753 dma_addr_t addr, align_addr; 754 void *desc, *align; 755 char *buffer; 756 int len, offset, i; 757 758 /* 759 * The spec does not specify endianness of descriptor table. 760 * We currently guess that it is LE. 761 */ 762 763 host->sg_count = sg_count; 764 765 desc = host->adma_table; 766 align = host->align_buffer; 767 768 align_addr = host->align_addr; 769 770 for_each_sg(data->sg, sg, host->sg_count, i) { 771 addr = sg_dma_address(sg); 772 len = sg_dma_len(sg); 773 774 /* 775 * The SDHCI specification states that ADMA addresses must 776 * be 32-bit aligned. If they aren't, then we use a bounce 777 * buffer for the (up to three) bytes that screw up the 778 * alignment. 779 */ 780 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) & 781 SDHCI_ADMA2_MASK; 782 if (offset) { 783 if (data->flags & MMC_DATA_WRITE) { 784 buffer = sdhci_kmap_atomic(sg); 785 memcpy(align, buffer, offset); 786 sdhci_kunmap_atomic(buffer); 787 } 788 789 /* tran, valid */ 790 __sdhci_adma_write_desc(host, &desc, align_addr, 791 offset, ADMA2_TRAN_VALID); 792 793 BUG_ON(offset > 65536); 794 795 align += SDHCI_ADMA2_ALIGN; 796 align_addr += SDHCI_ADMA2_ALIGN; 797 798 addr += offset; 799 len -= offset; 800 } 801 802 /* 803 * The block layer forces a minimum segment size of PAGE_SIZE, 804 * so 'len' can be too big here if PAGE_SIZE >= 64KiB. Write 805 * multiple descriptors, noting that the ADMA table is sized 806 * for 4KiB chunks anyway, so it will be big enough. 807 */ 808 while (len > host->max_adma) { 809 int n = 32 * 1024; /* 32KiB*/ 810 811 __sdhci_adma_write_desc(host, &desc, addr, n, ADMA2_TRAN_VALID); 812 addr += n; 813 len -= n; 814 } 815 816 /* tran, valid */ 817 if (len) 818 __sdhci_adma_write_desc(host, &desc, addr, len, 819 ADMA2_TRAN_VALID); 820 821 /* 822 * If this triggers then we have a calculation bug 823 * somewhere. :/ 824 */ 825 WARN_ON((desc - host->adma_table) >= host->adma_table_sz); 826 } 827 828 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) { 829 /* Mark the last descriptor as the terminating descriptor */ 830 if (desc != host->adma_table) { 831 desc -= host->desc_sz; 832 sdhci_adma_mark_end(desc); 833 } 834 } else { 835 /* Add a terminating entry - nop, end, valid */ 836 __sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID); 837 } 838 } 839 840 static void sdhci_adma_table_post(struct sdhci_host *host, 841 struct mmc_data *data) 842 { 843 struct scatterlist *sg; 844 int i, size; 845 void *align; 846 char *buffer; 847 848 if (data->flags & MMC_DATA_READ) { 849 bool has_unaligned = false; 850 851 /* Do a quick scan of the SG list for any unaligned mappings */ 852 for_each_sg(data->sg, sg, host->sg_count, i) 853 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) { 854 has_unaligned = true; 855 break; 856 } 857 858 if (has_unaligned) { 859 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg, 860 data->sg_len, DMA_FROM_DEVICE); 861 862 align = host->align_buffer; 863 864 for_each_sg(data->sg, sg, host->sg_count, i) { 865 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) { 866 size = SDHCI_ADMA2_ALIGN - 867 (sg_dma_address(sg) & SDHCI_ADMA2_MASK); 868 869 buffer = sdhci_kmap_atomic(sg); 870 memcpy(buffer, align, size); 871 sdhci_kunmap_atomic(buffer); 872 873 align += SDHCI_ADMA2_ALIGN; 874 } 875 } 876 } 877 } 878 } 879 880 static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr) 881 { 882 sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS); 883 if (host->flags & SDHCI_USE_64_BIT_DMA) 884 sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI); 885 } 886 887 static dma_addr_t sdhci_sdma_address(struct sdhci_host *host) 888 { 889 if (host->bounce_buffer) 890 return host->bounce_addr; 891 else 892 return sg_dma_address(host->data->sg); 893 } 894 895 static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr) 896 { 897 if (host->v4_mode) 898 sdhci_set_adma_addr(host, addr); 899 else 900 sdhci_writel(host, addr, SDHCI_DMA_ADDRESS); 901 } 902 903 static unsigned int sdhci_target_timeout(struct sdhci_host *host, 904 struct mmc_command *cmd, 905 struct mmc_data *data) 906 { 907 unsigned int target_timeout; 908 909 /* timeout in us */ 910 if (!data) { 911 target_timeout = cmd->busy_timeout * 1000; 912 } else { 913 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000); 914 if (host->clock && data->timeout_clks) { 915 unsigned long long val; 916 917 /* 918 * data->timeout_clks is in units of clock cycles. 919 * host->clock is in Hz. target_timeout is in us. 920 * Hence, us = 1000000 * cycles / Hz. Round up. 921 */ 922 val = 1000000ULL * data->timeout_clks; 923 if (do_div(val, host->clock)) 924 target_timeout++; 925 target_timeout += val; 926 } 927 } 928 929 return target_timeout; 930 } 931 932 static void sdhci_calc_sw_timeout(struct sdhci_host *host, 933 struct mmc_command *cmd) 934 { 935 struct mmc_data *data = cmd->data; 936 struct mmc_host *mmc = host->mmc; 937 struct mmc_ios *ios = &mmc->ios; 938 unsigned char bus_width = 1 << ios->bus_width; 939 unsigned int blksz; 940 unsigned int freq; 941 u64 target_timeout; 942 u64 transfer_time; 943 944 target_timeout = sdhci_target_timeout(host, cmd, data); 945 target_timeout *= NSEC_PER_USEC; 946 947 if (data) { 948 blksz = data->blksz; 949 freq = mmc->actual_clock ? : host->clock; 950 transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width); 951 do_div(transfer_time, freq); 952 /* multiply by '2' to account for any unknowns */ 953 transfer_time = transfer_time * 2; 954 /* calculate timeout for the entire data */ 955 host->data_timeout = data->blocks * target_timeout + 956 transfer_time; 957 } else { 958 host->data_timeout = target_timeout; 959 } 960 961 if (host->data_timeout) 962 host->data_timeout += MMC_CMD_TRANSFER_TIME; 963 } 964 965 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd, 966 bool *too_big) 967 { 968 u8 count; 969 struct mmc_data *data; 970 unsigned target_timeout, current_timeout; 971 972 *too_big = false; 973 974 /* 975 * If the host controller provides us with an incorrect timeout 976 * value, just skip the check and use the maximum. The hardware may take 977 * longer to time out, but that's much better than having a too-short 978 * timeout value. 979 */ 980 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) 981 return host->max_timeout_count; 982 983 /* Unspecified command, assume max */ 984 if (cmd == NULL) 985 return host->max_timeout_count; 986 987 data = cmd->data; 988 /* Unspecified timeout, assume max */ 989 if (!data && !cmd->busy_timeout) 990 return host->max_timeout_count; 991 992 /* timeout in us */ 993 target_timeout = sdhci_target_timeout(host, cmd, data); 994 995 /* 996 * Figure out needed cycles. 997 * We do this in steps in order to fit inside a 32 bit int. 998 * The first step is the minimum timeout, which will have a 999 * minimum resolution of 6 bits: 1000 * (1) 2^13*1000 > 2^22, 1001 * (2) host->timeout_clk < 2^16 1002 * => 1003 * (1) / (2) > 2^6 1004 */ 1005 count = 0; 1006 current_timeout = (1 << 13) * 1000 / host->timeout_clk; 1007 while (current_timeout < target_timeout) { 1008 count++; 1009 current_timeout <<= 1; 1010 if (count > host->max_timeout_count) { 1011 if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT)) 1012 DBG("Too large timeout 0x%x requested for CMD%d!\n", 1013 count, cmd->opcode); 1014 count = host->max_timeout_count; 1015 *too_big = true; 1016 break; 1017 } 1018 } 1019 1020 return count; 1021 } 1022 1023 static void sdhci_set_transfer_irqs(struct sdhci_host *host) 1024 { 1025 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL; 1026 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR; 1027 1028 if (host->flags & SDHCI_REQ_USE_DMA) 1029 host->ier = (host->ier & ~pio_irqs) | dma_irqs; 1030 else 1031 host->ier = (host->ier & ~dma_irqs) | pio_irqs; 1032 1033 if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12)) 1034 host->ier |= SDHCI_INT_AUTO_CMD_ERR; 1035 else 1036 host->ier &= ~SDHCI_INT_AUTO_CMD_ERR; 1037 1038 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 1039 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 1040 } 1041 1042 void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable) 1043 { 1044 if (enable) 1045 host->ier |= SDHCI_INT_DATA_TIMEOUT; 1046 else 1047 host->ier &= ~SDHCI_INT_DATA_TIMEOUT; 1048 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 1049 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 1050 } 1051 EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq); 1052 1053 void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) 1054 { 1055 bool too_big = false; 1056 u8 count = sdhci_calc_timeout(host, cmd, &too_big); 1057 1058 if (too_big && 1059 host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) { 1060 sdhci_calc_sw_timeout(host, cmd); 1061 sdhci_set_data_timeout_irq(host, false); 1062 } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) { 1063 sdhci_set_data_timeout_irq(host, true); 1064 } 1065 1066 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL); 1067 } 1068 EXPORT_SYMBOL_GPL(__sdhci_set_timeout); 1069 1070 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) 1071 { 1072 if (host->ops->set_timeout) 1073 host->ops->set_timeout(host, cmd); 1074 else 1075 __sdhci_set_timeout(host, cmd); 1076 } 1077 1078 static void sdhci_initialize_data(struct sdhci_host *host, 1079 struct mmc_data *data) 1080 { 1081 WARN_ON(host->data); 1082 1083 /* Sanity checks */ 1084 BUG_ON(data->blksz * data->blocks > 524288); 1085 BUG_ON(data->blksz > host->mmc->max_blk_size); 1086 BUG_ON(data->blocks > 65535); 1087 1088 host->data = data; 1089 host->data_early = 0; 1090 host->data->bytes_xfered = 0; 1091 } 1092 1093 static inline void sdhci_set_block_info(struct sdhci_host *host, 1094 struct mmc_data *data) 1095 { 1096 /* Set the DMA boundary value and block size */ 1097 sdhci_writew(host, 1098 SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz), 1099 SDHCI_BLOCK_SIZE); 1100 /* 1101 * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count 1102 * can be supported, in that case 16-bit block count register must be 0. 1103 */ 1104 if (host->version >= SDHCI_SPEC_410 && host->v4_mode && 1105 (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) { 1106 if (sdhci_readw(host, SDHCI_BLOCK_COUNT)) 1107 sdhci_writew(host, 0, SDHCI_BLOCK_COUNT); 1108 sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT); 1109 } else { 1110 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); 1111 } 1112 } 1113 1114 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) 1115 { 1116 struct mmc_data *data = cmd->data; 1117 1118 sdhci_initialize_data(host, data); 1119 1120 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 1121 struct scatterlist *sg; 1122 unsigned int length_mask, offset_mask; 1123 int i; 1124 1125 host->flags |= SDHCI_REQ_USE_DMA; 1126 1127 /* 1128 * FIXME: This doesn't account for merging when mapping the 1129 * scatterlist. 1130 * 1131 * The assumption here being that alignment and lengths are 1132 * the same after DMA mapping to device address space. 1133 */ 1134 length_mask = 0; 1135 offset_mask = 0; 1136 if (host->flags & SDHCI_USE_ADMA) { 1137 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) { 1138 length_mask = 3; 1139 /* 1140 * As we use up to 3 byte chunks to work 1141 * around alignment problems, we need to 1142 * check the offset as well. 1143 */ 1144 offset_mask = 3; 1145 } 1146 } else { 1147 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) 1148 length_mask = 3; 1149 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) 1150 offset_mask = 3; 1151 } 1152 1153 if (unlikely(length_mask | offset_mask)) { 1154 for_each_sg(data->sg, sg, data->sg_len, i) { 1155 if (sg->length & length_mask) { 1156 DBG("Reverting to PIO because of transfer size (%d)\n", 1157 sg->length); 1158 host->flags &= ~SDHCI_REQ_USE_DMA; 1159 break; 1160 } 1161 if (sg->offset & offset_mask) { 1162 DBG("Reverting to PIO because of bad alignment\n"); 1163 host->flags &= ~SDHCI_REQ_USE_DMA; 1164 break; 1165 } 1166 } 1167 } 1168 } 1169 1170 sdhci_config_dma(host); 1171 1172 if (host->flags & SDHCI_REQ_USE_DMA) { 1173 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED); 1174 1175 if (sg_cnt <= 0) { 1176 /* 1177 * This only happens when someone fed 1178 * us an invalid request. 1179 */ 1180 WARN_ON(1); 1181 host->flags &= ~SDHCI_REQ_USE_DMA; 1182 } else if (host->flags & SDHCI_USE_ADMA) { 1183 sdhci_adma_table_pre(host, data, sg_cnt); 1184 sdhci_set_adma_addr(host, host->adma_addr); 1185 } else { 1186 WARN_ON(sg_cnt != 1); 1187 sdhci_set_sdma_addr(host, sdhci_sdma_address(host)); 1188 } 1189 } 1190 1191 if (!(host->flags & SDHCI_REQ_USE_DMA)) { 1192 int flags; 1193 1194 flags = SG_MITER_ATOMIC; 1195 if (host->data->flags & MMC_DATA_READ) 1196 flags |= SG_MITER_TO_SG; 1197 else 1198 flags |= SG_MITER_FROM_SG; 1199 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 1200 host->blocks = data->blocks; 1201 } 1202 1203 sdhci_set_transfer_irqs(host); 1204 1205 sdhci_set_block_info(host, data); 1206 } 1207 1208 #if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA) 1209 1210 static int sdhci_external_dma_init(struct sdhci_host *host) 1211 { 1212 int ret = 0; 1213 struct mmc_host *mmc = host->mmc; 1214 1215 host->tx_chan = dma_request_chan(mmc_dev(mmc), "tx"); 1216 if (IS_ERR(host->tx_chan)) { 1217 ret = PTR_ERR(host->tx_chan); 1218 if (ret != -EPROBE_DEFER) 1219 pr_warn("Failed to request TX DMA channel.\n"); 1220 host->tx_chan = NULL; 1221 return ret; 1222 } 1223 1224 host->rx_chan = dma_request_chan(mmc_dev(mmc), "rx"); 1225 if (IS_ERR(host->rx_chan)) { 1226 if (host->tx_chan) { 1227 dma_release_channel(host->tx_chan); 1228 host->tx_chan = NULL; 1229 } 1230 1231 ret = PTR_ERR(host->rx_chan); 1232 if (ret != -EPROBE_DEFER) 1233 pr_warn("Failed to request RX DMA channel.\n"); 1234 host->rx_chan = NULL; 1235 } 1236 1237 return ret; 1238 } 1239 1240 static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host, 1241 struct mmc_data *data) 1242 { 1243 return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan; 1244 } 1245 1246 static int sdhci_external_dma_setup(struct sdhci_host *host, 1247 struct mmc_command *cmd) 1248 { 1249 int ret, i; 1250 enum dma_transfer_direction dir; 1251 struct dma_async_tx_descriptor *desc; 1252 struct mmc_data *data = cmd->data; 1253 struct dma_chan *chan; 1254 struct dma_slave_config cfg; 1255 dma_cookie_t cookie; 1256 int sg_cnt; 1257 1258 if (!host->mapbase) 1259 return -EINVAL; 1260 1261 memset(&cfg, 0, sizeof(cfg)); 1262 cfg.src_addr = host->mapbase + SDHCI_BUFFER; 1263 cfg.dst_addr = host->mapbase + SDHCI_BUFFER; 1264 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 1265 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 1266 cfg.src_maxburst = data->blksz / 4; 1267 cfg.dst_maxburst = data->blksz / 4; 1268 1269 /* Sanity check: all the SG entries must be aligned by block size. */ 1270 for (i = 0; i < data->sg_len; i++) { 1271 if ((data->sg + i)->length % data->blksz) 1272 return -EINVAL; 1273 } 1274 1275 chan = sdhci_external_dma_channel(host, data); 1276 1277 ret = dmaengine_slave_config(chan, &cfg); 1278 if (ret) 1279 return ret; 1280 1281 sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED); 1282 if (sg_cnt <= 0) 1283 return -EINVAL; 1284 1285 dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; 1286 desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir, 1287 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 1288 if (!desc) 1289 return -EINVAL; 1290 1291 desc->callback = NULL; 1292 desc->callback_param = NULL; 1293 1294 cookie = dmaengine_submit(desc); 1295 if (dma_submit_error(cookie)) 1296 ret = cookie; 1297 1298 return ret; 1299 } 1300 1301 static void sdhci_external_dma_release(struct sdhci_host *host) 1302 { 1303 if (host->tx_chan) { 1304 dma_release_channel(host->tx_chan); 1305 host->tx_chan = NULL; 1306 } 1307 1308 if (host->rx_chan) { 1309 dma_release_channel(host->rx_chan); 1310 host->rx_chan = NULL; 1311 } 1312 1313 sdhci_switch_external_dma(host, false); 1314 } 1315 1316 static void __sdhci_external_dma_prepare_data(struct sdhci_host *host, 1317 struct mmc_command *cmd) 1318 { 1319 struct mmc_data *data = cmd->data; 1320 1321 sdhci_initialize_data(host, data); 1322 1323 host->flags |= SDHCI_REQ_USE_DMA; 1324 sdhci_set_transfer_irqs(host); 1325 1326 sdhci_set_block_info(host, data); 1327 } 1328 1329 static void sdhci_external_dma_prepare_data(struct sdhci_host *host, 1330 struct mmc_command *cmd) 1331 { 1332 if (!sdhci_external_dma_setup(host, cmd)) { 1333 __sdhci_external_dma_prepare_data(host, cmd); 1334 } else { 1335 sdhci_external_dma_release(host); 1336 pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n", 1337 mmc_hostname(host->mmc)); 1338 sdhci_prepare_data(host, cmd); 1339 } 1340 } 1341 1342 static void sdhci_external_dma_pre_transfer(struct sdhci_host *host, 1343 struct mmc_command *cmd) 1344 { 1345 struct dma_chan *chan; 1346 1347 if (!cmd->data) 1348 return; 1349 1350 chan = sdhci_external_dma_channel(host, cmd->data); 1351 if (chan) 1352 dma_async_issue_pending(chan); 1353 } 1354 1355 #else 1356 1357 static inline int sdhci_external_dma_init(struct sdhci_host *host) 1358 { 1359 return -EOPNOTSUPP; 1360 } 1361 1362 static inline void sdhci_external_dma_release(struct sdhci_host *host) 1363 { 1364 } 1365 1366 static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host, 1367 struct mmc_command *cmd) 1368 { 1369 /* This should never happen */ 1370 WARN_ON_ONCE(1); 1371 } 1372 1373 static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host, 1374 struct mmc_command *cmd) 1375 { 1376 } 1377 1378 static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host, 1379 struct mmc_data *data) 1380 { 1381 return NULL; 1382 } 1383 1384 #endif 1385 1386 void sdhci_switch_external_dma(struct sdhci_host *host, bool en) 1387 { 1388 host->use_external_dma = en; 1389 } 1390 EXPORT_SYMBOL_GPL(sdhci_switch_external_dma); 1391 1392 static inline bool sdhci_auto_cmd12(struct sdhci_host *host, 1393 struct mmc_request *mrq) 1394 { 1395 return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) && 1396 !mrq->cap_cmd_during_tfr; 1397 } 1398 1399 static inline bool sdhci_auto_cmd23(struct sdhci_host *host, 1400 struct mmc_request *mrq) 1401 { 1402 return mrq->sbc && (host->flags & SDHCI_AUTO_CMD23); 1403 } 1404 1405 static inline bool sdhci_manual_cmd23(struct sdhci_host *host, 1406 struct mmc_request *mrq) 1407 { 1408 return mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23); 1409 } 1410 1411 static inline void sdhci_auto_cmd_select(struct sdhci_host *host, 1412 struct mmc_command *cmd, 1413 u16 *mode) 1414 { 1415 bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) && 1416 (cmd->opcode != SD_IO_RW_EXTENDED); 1417 bool use_cmd23 = sdhci_auto_cmd23(host, cmd->mrq); 1418 u16 ctrl2; 1419 1420 /* 1421 * In case of Version 4.10 or later, use of 'Auto CMD Auto 1422 * Select' is recommended rather than use of 'Auto CMD12 1423 * Enable' or 'Auto CMD23 Enable'. We require Version 4 Mode 1424 * here because some controllers (e.g sdhci-of-dwmshc) expect it. 1425 */ 1426 if (host->version >= SDHCI_SPEC_410 && host->v4_mode && 1427 (use_cmd12 || use_cmd23)) { 1428 *mode |= SDHCI_TRNS_AUTO_SEL; 1429 1430 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1431 if (use_cmd23) 1432 ctrl2 |= SDHCI_CMD23_ENABLE; 1433 else 1434 ctrl2 &= ~SDHCI_CMD23_ENABLE; 1435 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); 1436 1437 return; 1438 } 1439 1440 /* 1441 * If we are sending CMD23, CMD12 never gets sent 1442 * on successful completion (so no Auto-CMD12). 1443 */ 1444 if (use_cmd12) 1445 *mode |= SDHCI_TRNS_AUTO_CMD12; 1446 else if (use_cmd23) 1447 *mode |= SDHCI_TRNS_AUTO_CMD23; 1448 } 1449 1450 static void sdhci_set_transfer_mode(struct sdhci_host *host, 1451 struct mmc_command *cmd) 1452 { 1453 u16 mode = 0; 1454 struct mmc_data *data = cmd->data; 1455 1456 if (data == NULL) { 1457 if (host->quirks2 & 1458 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) { 1459 /* must not clear SDHCI_TRANSFER_MODE when tuning */ 1460 if (!mmc_op_tuning(cmd->opcode)) 1461 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE); 1462 } else { 1463 /* clear Auto CMD settings for no data CMDs */ 1464 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE); 1465 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | 1466 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE); 1467 } 1468 return; 1469 } 1470 1471 WARN_ON(!host->data); 1472 1473 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE)) 1474 mode = SDHCI_TRNS_BLK_CNT_EN; 1475 1476 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) { 1477 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI; 1478 sdhci_auto_cmd_select(host, cmd, &mode); 1479 if (sdhci_auto_cmd23(host, cmd->mrq)) 1480 sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2); 1481 } 1482 1483 if (data->flags & MMC_DATA_READ) 1484 mode |= SDHCI_TRNS_READ; 1485 if (host->flags & SDHCI_REQ_USE_DMA) 1486 mode |= SDHCI_TRNS_DMA; 1487 1488 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE); 1489 } 1490 1491 static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq) 1492 { 1493 return (!(host->flags & SDHCI_DEVICE_DEAD) && 1494 ((mrq->cmd && mrq->cmd->error) || 1495 (mrq->sbc && mrq->sbc->error) || 1496 (mrq->data && mrq->data->stop && mrq->data->stop->error) || 1497 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))); 1498 } 1499 1500 static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq) 1501 { 1502 int i; 1503 1504 for (i = 0; i < SDHCI_MAX_MRQS; i++) { 1505 if (host->mrqs_done[i] == mrq) { 1506 WARN_ON(1); 1507 return; 1508 } 1509 } 1510 1511 for (i = 0; i < SDHCI_MAX_MRQS; i++) { 1512 if (!host->mrqs_done[i]) { 1513 host->mrqs_done[i] = mrq; 1514 break; 1515 } 1516 } 1517 1518 WARN_ON(i >= SDHCI_MAX_MRQS); 1519 } 1520 1521 static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) 1522 { 1523 if (host->cmd && host->cmd->mrq == mrq) 1524 host->cmd = NULL; 1525 1526 if (host->data_cmd && host->data_cmd->mrq == mrq) 1527 host->data_cmd = NULL; 1528 1529 if (host->deferred_cmd && host->deferred_cmd->mrq == mrq) 1530 host->deferred_cmd = NULL; 1531 1532 if (host->data && host->data->mrq == mrq) 1533 host->data = NULL; 1534 1535 if (sdhci_needs_reset(host, mrq)) 1536 host->pending_reset = true; 1537 1538 sdhci_set_mrq_done(host, mrq); 1539 1540 sdhci_del_timer(host, mrq); 1541 1542 if (!sdhci_has_requests(host)) 1543 sdhci_led_deactivate(host); 1544 } 1545 1546 static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) 1547 { 1548 __sdhci_finish_mrq(host, mrq); 1549 1550 queue_work(host->complete_wq, &host->complete_work); 1551 } 1552 1553 static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout) 1554 { 1555 struct mmc_command *data_cmd = host->data_cmd; 1556 struct mmc_data *data = host->data; 1557 1558 host->data = NULL; 1559 host->data_cmd = NULL; 1560 1561 /* 1562 * The controller needs a reset of internal state machines upon error 1563 * conditions. 1564 */ 1565 if (data->error) { 1566 if (!host->cmd || host->cmd == data_cmd) 1567 sdhci_reset_for(host, REQUEST_ERROR); 1568 else 1569 sdhci_reset_for(host, REQUEST_ERROR_DATA_ONLY); 1570 } 1571 1572 if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) == 1573 (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) 1574 sdhci_adma_table_post(host, data); 1575 1576 /* 1577 * The specification states that the block count register must 1578 * be updated, but it does not specify at what point in the 1579 * data flow. That makes the register entirely useless to read 1580 * back so we have to assume that nothing made it to the card 1581 * in the event of an error. 1582 */ 1583 if (data->error) 1584 data->bytes_xfered = 0; 1585 else 1586 data->bytes_xfered = data->blksz * data->blocks; 1587 1588 /* 1589 * Need to send CMD12 if - 1590 * a) open-ended multiblock transfer not using auto CMD12 (no CMD23) 1591 * b) error in multiblock transfer 1592 */ 1593 if (data->stop && 1594 ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) || 1595 data->error)) { 1596 /* 1597 * 'cap_cmd_during_tfr' request must not use the command line 1598 * after mmc_command_done() has been called. It is upper layer's 1599 * responsibility to send the stop command if required. 1600 */ 1601 if (data->mrq->cap_cmd_during_tfr) { 1602 __sdhci_finish_mrq(host, data->mrq); 1603 } else { 1604 /* Avoid triggering warning in sdhci_send_command() */ 1605 host->cmd = NULL; 1606 if (!sdhci_send_command(host, data->stop)) { 1607 if (sw_data_timeout) { 1608 /* 1609 * This is anyway a sw data timeout, so 1610 * give up now. 1611 */ 1612 data->stop->error = -EIO; 1613 __sdhci_finish_mrq(host, data->mrq); 1614 } else { 1615 WARN_ON(host->deferred_cmd); 1616 host->deferred_cmd = data->stop; 1617 } 1618 } 1619 } 1620 } else { 1621 __sdhci_finish_mrq(host, data->mrq); 1622 } 1623 } 1624 1625 static void sdhci_finish_data(struct sdhci_host *host) 1626 { 1627 __sdhci_finish_data(host, false); 1628 } 1629 1630 static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) 1631 { 1632 int flags; 1633 u32 mask; 1634 unsigned long timeout; 1635 1636 WARN_ON(host->cmd); 1637 1638 /* Initially, a command has no error */ 1639 cmd->error = 0; 1640 1641 if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) && 1642 cmd->opcode == MMC_STOP_TRANSMISSION) 1643 cmd->flags |= MMC_RSP_BUSY; 1644 1645 mask = SDHCI_CMD_INHIBIT; 1646 if (sdhci_data_line_cmd(cmd)) 1647 mask |= SDHCI_DATA_INHIBIT; 1648 1649 /* We shouldn't wait for data inihibit for stop commands, even 1650 though they might use busy signaling */ 1651 if (cmd->mrq->data && (cmd == cmd->mrq->data->stop)) 1652 mask &= ~SDHCI_DATA_INHIBIT; 1653 1654 if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) 1655 return false; 1656 1657 host->cmd = cmd; 1658 host->data_timeout = 0; 1659 if (sdhci_data_line_cmd(cmd)) { 1660 WARN_ON(host->data_cmd); 1661 host->data_cmd = cmd; 1662 sdhci_set_timeout(host, cmd); 1663 } 1664 1665 if (cmd->data) { 1666 if (host->use_external_dma) 1667 sdhci_external_dma_prepare_data(host, cmd); 1668 else 1669 sdhci_prepare_data(host, cmd); 1670 } 1671 1672 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT); 1673 1674 sdhci_set_transfer_mode(host, cmd); 1675 1676 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { 1677 WARN_ONCE(1, "Unsupported response type!\n"); 1678 /* 1679 * This does not happen in practice because 136-bit response 1680 * commands never have busy waiting, so rather than complicate 1681 * the error path, just remove busy waiting and continue. 1682 */ 1683 cmd->flags &= ~MMC_RSP_BUSY; 1684 } 1685 1686 if (!(cmd->flags & MMC_RSP_PRESENT)) 1687 flags = SDHCI_CMD_RESP_NONE; 1688 else if (cmd->flags & MMC_RSP_136) 1689 flags = SDHCI_CMD_RESP_LONG; 1690 else if (cmd->flags & MMC_RSP_BUSY) 1691 flags = SDHCI_CMD_RESP_SHORT_BUSY; 1692 else 1693 flags = SDHCI_CMD_RESP_SHORT; 1694 1695 if (cmd->flags & MMC_RSP_CRC) 1696 flags |= SDHCI_CMD_CRC; 1697 if (cmd->flags & MMC_RSP_OPCODE) 1698 flags |= SDHCI_CMD_INDEX; 1699 1700 /* CMD19 is special in that the Data Present Select should be set */ 1701 if (cmd->data || mmc_op_tuning(cmd->opcode)) 1702 flags |= SDHCI_CMD_DATA; 1703 1704 timeout = jiffies; 1705 if (host->data_timeout) 1706 timeout += nsecs_to_jiffies(host->data_timeout); 1707 else if (!cmd->data && cmd->busy_timeout > 9000) 1708 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; 1709 else 1710 timeout += 10 * HZ; 1711 sdhci_mod_timer(host, cmd->mrq, timeout); 1712 1713 if (host->use_external_dma) 1714 sdhci_external_dma_pre_transfer(host, cmd); 1715 1716 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND); 1717 1718 return true; 1719 } 1720 1721 static bool sdhci_present_error(struct sdhci_host *host, 1722 struct mmc_command *cmd, bool present) 1723 { 1724 if (!present || host->flags & SDHCI_DEVICE_DEAD) { 1725 cmd->error = -ENOMEDIUM; 1726 return true; 1727 } 1728 1729 return false; 1730 } 1731 1732 static bool sdhci_send_command_retry(struct sdhci_host *host, 1733 struct mmc_command *cmd, 1734 unsigned long flags) 1735 __releases(host->lock) 1736 __acquires(host->lock) 1737 { 1738 struct mmc_command *deferred_cmd = host->deferred_cmd; 1739 int timeout = 10; /* Approx. 10 ms */ 1740 bool present; 1741 1742 while (!sdhci_send_command(host, cmd)) { 1743 if (!timeout--) { 1744 pr_err("%s: Controller never released inhibit bit(s).\n", 1745 mmc_hostname(host->mmc)); 1746 sdhci_err_stats_inc(host, CTRL_TIMEOUT); 1747 sdhci_dumpregs(host); 1748 cmd->error = -EIO; 1749 return false; 1750 } 1751 1752 spin_unlock_irqrestore(&host->lock, flags); 1753 1754 usleep_range(1000, 1250); 1755 1756 present = host->mmc->ops->get_cd(host->mmc); 1757 1758 spin_lock_irqsave(&host->lock, flags); 1759 1760 /* A deferred command might disappear, handle that */ 1761 if (cmd == deferred_cmd && cmd != host->deferred_cmd) 1762 return true; 1763 1764 if (sdhci_present_error(host, cmd, present)) 1765 return false; 1766 } 1767 1768 if (cmd == host->deferred_cmd) 1769 host->deferred_cmd = NULL; 1770 1771 return true; 1772 } 1773 1774 static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd) 1775 { 1776 int i, reg; 1777 1778 for (i = 0; i < 4; i++) { 1779 reg = SDHCI_RESPONSE + (3 - i) * 4; 1780 cmd->resp[i] = sdhci_readl(host, reg); 1781 } 1782 1783 if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC) 1784 return; 1785 1786 /* CRC is stripped so we need to do some shifting */ 1787 for (i = 0; i < 4; i++) { 1788 cmd->resp[i] <<= 8; 1789 if (i != 3) 1790 cmd->resp[i] |= cmd->resp[i + 1] >> 24; 1791 } 1792 } 1793 1794 static void sdhci_finish_command(struct sdhci_host *host) 1795 { 1796 struct mmc_command *cmd = host->cmd; 1797 1798 host->cmd = NULL; 1799 1800 if (cmd->flags & MMC_RSP_PRESENT) { 1801 if (cmd->flags & MMC_RSP_136) { 1802 sdhci_read_rsp_136(host, cmd); 1803 } else { 1804 cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE); 1805 } 1806 } 1807 1808 if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd) 1809 mmc_command_done(host->mmc, cmd->mrq); 1810 1811 /* 1812 * The host can send and interrupt when the busy state has 1813 * ended, allowing us to wait without wasting CPU cycles. 1814 * The busy signal uses DAT0 so this is similar to waiting 1815 * for data to complete. 1816 * 1817 * Note: The 1.0 specification is a bit ambiguous about this 1818 * feature so there might be some problems with older 1819 * controllers. 1820 */ 1821 if (cmd->flags & MMC_RSP_BUSY) { 1822 if (cmd->data) { 1823 DBG("Cannot wait for busy signal when also doing a data transfer"); 1824 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) && 1825 cmd == host->data_cmd) { 1826 /* Command complete before busy is ended */ 1827 return; 1828 } 1829 } 1830 1831 /* Finished CMD23, now send actual command. */ 1832 if (cmd == cmd->mrq->sbc) { 1833 if (!sdhci_send_command(host, cmd->mrq->cmd)) { 1834 WARN_ON(host->deferred_cmd); 1835 host->deferred_cmd = cmd->mrq->cmd; 1836 } 1837 } else { 1838 1839 /* Processed actual command. */ 1840 if (host->data && host->data_early) 1841 sdhci_finish_data(host); 1842 1843 if (!cmd->data) 1844 __sdhci_finish_mrq(host, cmd->mrq); 1845 } 1846 } 1847 1848 static u16 sdhci_get_preset_value(struct sdhci_host *host) 1849 { 1850 u16 preset = 0; 1851 1852 switch (host->timing) { 1853 case MMC_TIMING_MMC_HS: 1854 case MMC_TIMING_SD_HS: 1855 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HIGH_SPEED); 1856 break; 1857 case MMC_TIMING_UHS_SDR12: 1858 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); 1859 break; 1860 case MMC_TIMING_UHS_SDR25: 1861 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25); 1862 break; 1863 case MMC_TIMING_UHS_SDR50: 1864 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50); 1865 break; 1866 case MMC_TIMING_UHS_SDR104: 1867 case MMC_TIMING_MMC_HS200: 1868 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104); 1869 break; 1870 case MMC_TIMING_UHS_DDR50: 1871 case MMC_TIMING_MMC_DDR52: 1872 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50); 1873 break; 1874 case MMC_TIMING_MMC_HS400: 1875 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400); 1876 break; 1877 default: 1878 pr_warn("%s: Invalid UHS-I mode selected\n", 1879 mmc_hostname(host->mmc)); 1880 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); 1881 break; 1882 } 1883 return preset; 1884 } 1885 1886 u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock, 1887 unsigned int *actual_clock) 1888 { 1889 int div = 0; /* Initialized for compiler warning */ 1890 int real_div = div, clk_mul = 1; 1891 u16 clk = 0; 1892 bool switch_base_clk = false; 1893 1894 if (host->version >= SDHCI_SPEC_300) { 1895 if (host->preset_enabled) { 1896 u16 pre_val; 1897 1898 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1899 pre_val = sdhci_get_preset_value(host); 1900 div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val); 1901 if (host->clk_mul && 1902 (pre_val & SDHCI_PRESET_CLKGEN_SEL)) { 1903 clk = SDHCI_PROG_CLOCK_MODE; 1904 real_div = div + 1; 1905 clk_mul = host->clk_mul; 1906 } else { 1907 real_div = max_t(int, 1, div << 1); 1908 } 1909 goto clock_set; 1910 } 1911 1912 /* 1913 * Check if the Host Controller supports Programmable Clock 1914 * Mode. 1915 */ 1916 if (host->clk_mul) { 1917 for (div = 1; div <= 1024; div++) { 1918 if ((host->max_clk * host->clk_mul / div) 1919 <= clock) 1920 break; 1921 } 1922 if ((host->max_clk * host->clk_mul / div) <= clock) { 1923 /* 1924 * Set Programmable Clock Mode in the Clock 1925 * Control register. 1926 */ 1927 clk = SDHCI_PROG_CLOCK_MODE; 1928 real_div = div; 1929 clk_mul = host->clk_mul; 1930 div--; 1931 } else { 1932 /* 1933 * Divisor can be too small to reach clock 1934 * speed requirement. Then use the base clock. 1935 */ 1936 switch_base_clk = true; 1937 } 1938 } 1939 1940 if (!host->clk_mul || switch_base_clk) { 1941 /* Version 3.00 divisors must be a multiple of 2. */ 1942 if (host->max_clk <= clock) 1943 div = 1; 1944 else { 1945 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; 1946 div += 2) { 1947 if ((host->max_clk / div) <= clock) 1948 break; 1949 } 1950 } 1951 real_div = div; 1952 div >>= 1; 1953 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN) 1954 && !div && host->max_clk <= 25000000) 1955 div = 1; 1956 } 1957 } else { 1958 /* Version 2.00 divisors must be a power of 2. */ 1959 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) { 1960 if ((host->max_clk / div) <= clock) 1961 break; 1962 } 1963 real_div = div; 1964 div >>= 1; 1965 } 1966 1967 clock_set: 1968 if (real_div) 1969 *actual_clock = (host->max_clk * clk_mul) / real_div; 1970 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT; 1971 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) 1972 << SDHCI_DIVIDER_HI_SHIFT; 1973 1974 return clk; 1975 } 1976 EXPORT_SYMBOL_GPL(sdhci_calc_clk); 1977 1978 void sdhci_enable_clk(struct sdhci_host *host, u16 clk) 1979 { 1980 ktime_t timeout; 1981 1982 clk |= SDHCI_CLOCK_INT_EN; 1983 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1984 1985 /* Wait max 150 ms */ 1986 timeout = ktime_add_ms(ktime_get(), 150); 1987 while (1) { 1988 bool timedout = ktime_after(ktime_get(), timeout); 1989 1990 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1991 if (clk & SDHCI_CLOCK_INT_STABLE) 1992 break; 1993 if (timedout) { 1994 pr_err("%s: Internal clock never stabilised.\n", 1995 mmc_hostname(host->mmc)); 1996 sdhci_err_stats_inc(host, CTRL_TIMEOUT); 1997 sdhci_dumpregs(host); 1998 return; 1999 } 2000 udelay(10); 2001 } 2002 2003 if (host->version >= SDHCI_SPEC_410 && host->v4_mode) { 2004 clk |= SDHCI_CLOCK_PLL_EN; 2005 clk &= ~SDHCI_CLOCK_INT_STABLE; 2006 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 2007 2008 /* Wait max 150 ms */ 2009 timeout = ktime_add_ms(ktime_get(), 150); 2010 while (1) { 2011 bool timedout = ktime_after(ktime_get(), timeout); 2012 2013 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 2014 if (clk & SDHCI_CLOCK_INT_STABLE) 2015 break; 2016 if (timedout) { 2017 pr_err("%s: PLL clock never stabilised.\n", 2018 mmc_hostname(host->mmc)); 2019 sdhci_err_stats_inc(host, CTRL_TIMEOUT); 2020 sdhci_dumpregs(host); 2021 return; 2022 } 2023 udelay(10); 2024 } 2025 } 2026 2027 clk |= SDHCI_CLOCK_CARD_EN; 2028 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 2029 } 2030 EXPORT_SYMBOL_GPL(sdhci_enable_clk); 2031 2032 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) 2033 { 2034 u16 clk; 2035 2036 host->mmc->actual_clock = 0; 2037 2038 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); 2039 2040 if (clock == 0) 2041 return; 2042 2043 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock); 2044 sdhci_enable_clk(host, clk); 2045 } 2046 EXPORT_SYMBOL_GPL(sdhci_set_clock); 2047 2048 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode, 2049 unsigned short vdd) 2050 { 2051 struct mmc_host *mmc = host->mmc; 2052 2053 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 2054 2055 if (mode != MMC_POWER_OFF) 2056 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL); 2057 else 2058 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 2059 } 2060 2061 void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode, 2062 unsigned short vdd) 2063 { 2064 u8 pwr = 0; 2065 2066 if (mode != MMC_POWER_OFF) { 2067 switch (1 << vdd) { 2068 case MMC_VDD_165_195: 2069 /* 2070 * Without a regulator, SDHCI does not support 2.0v 2071 * so we only get here if the driver deliberately 2072 * added the 2.0v range to ocr_avail. Map it to 1.8v 2073 * for the purpose of turning on the power. 2074 */ 2075 case MMC_VDD_20_21: 2076 pwr = SDHCI_POWER_180; 2077 break; 2078 case MMC_VDD_29_30: 2079 case MMC_VDD_30_31: 2080 pwr = SDHCI_POWER_300; 2081 break; 2082 case MMC_VDD_32_33: 2083 case MMC_VDD_33_34: 2084 /* 2085 * 3.4 ~ 3.6V are valid only for those platforms where it's 2086 * known that the voltage range is supported by hardware. 2087 */ 2088 case MMC_VDD_34_35: 2089 case MMC_VDD_35_36: 2090 pwr = SDHCI_POWER_330; 2091 break; 2092 default: 2093 WARN(1, "%s: Invalid vdd %#x\n", 2094 mmc_hostname(host->mmc), vdd); 2095 break; 2096 } 2097 } 2098 2099 if (host->pwr == pwr) 2100 return; 2101 2102 host->pwr = pwr; 2103 2104 if (pwr == 0) { 2105 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 2106 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 2107 sdhci_runtime_pm_bus_off(host); 2108 } else { 2109 /* 2110 * Spec says that we should clear the power reg before setting 2111 * a new value. Some controllers don't seem to like this though. 2112 */ 2113 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE)) 2114 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 2115 2116 /* 2117 * At least the Marvell CaFe chip gets confused if we set the 2118 * voltage and set turn on power at the same time, so set the 2119 * voltage first. 2120 */ 2121 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER) 2122 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); 2123 2124 pwr |= SDHCI_POWER_ON; 2125 2126 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); 2127 2128 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 2129 sdhci_runtime_pm_bus_on(host); 2130 2131 /* 2132 * Some controllers need an extra 10ms delay of 10ms before 2133 * they can apply clock after applying power 2134 */ 2135 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER) 2136 mdelay(10); 2137 } 2138 } 2139 EXPORT_SYMBOL_GPL(sdhci_set_power_noreg); 2140 2141 void sdhci_set_power(struct sdhci_host *host, unsigned char mode, 2142 unsigned short vdd) 2143 { 2144 if (IS_ERR(host->mmc->supply.vmmc)) 2145 sdhci_set_power_noreg(host, mode, vdd); 2146 else 2147 sdhci_set_power_reg(host, mode, vdd); 2148 } 2149 EXPORT_SYMBOL_GPL(sdhci_set_power); 2150 2151 /* 2152 * Some controllers need to configure a valid bus voltage on their power 2153 * register regardless of whether an external regulator is taking care of power 2154 * supply. This helper function takes care of it if set as the controller's 2155 * sdhci_ops.set_power callback. 2156 */ 2157 void sdhci_set_power_and_bus_voltage(struct sdhci_host *host, 2158 unsigned char mode, 2159 unsigned short vdd) 2160 { 2161 if (!IS_ERR(host->mmc->supply.vmmc)) { 2162 struct mmc_host *mmc = host->mmc; 2163 2164 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 2165 } 2166 sdhci_set_power_noreg(host, mode, vdd); 2167 } 2168 EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage); 2169 2170 /*****************************************************************************\ 2171 * * 2172 * MMC callbacks * 2173 * * 2174 \*****************************************************************************/ 2175 2176 void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) 2177 { 2178 struct sdhci_host *host = mmc_priv(mmc); 2179 struct mmc_command *cmd; 2180 unsigned long flags; 2181 bool present; 2182 2183 /* Firstly check card presence */ 2184 present = mmc->ops->get_cd(mmc); 2185 2186 spin_lock_irqsave(&host->lock, flags); 2187 2188 sdhci_led_activate(host); 2189 2190 if (sdhci_present_error(host, mrq->cmd, present)) 2191 goto out_finish; 2192 2193 cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd; 2194 2195 if (!sdhci_send_command_retry(host, cmd, flags)) 2196 goto out_finish; 2197 2198 spin_unlock_irqrestore(&host->lock, flags); 2199 2200 return; 2201 2202 out_finish: 2203 sdhci_finish_mrq(host, mrq); 2204 spin_unlock_irqrestore(&host->lock, flags); 2205 } 2206 EXPORT_SYMBOL_GPL(sdhci_request); 2207 2208 int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq) 2209 { 2210 struct sdhci_host *host = mmc_priv(mmc); 2211 struct mmc_command *cmd; 2212 unsigned long flags; 2213 int ret = 0; 2214 2215 spin_lock_irqsave(&host->lock, flags); 2216 2217 if (sdhci_present_error(host, mrq->cmd, true)) { 2218 sdhci_finish_mrq(host, mrq); 2219 goto out_finish; 2220 } 2221 2222 cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd; 2223 2224 /* 2225 * The HSQ may send a command in interrupt context without polling 2226 * the busy signaling, which means we should return BUSY if controller 2227 * has not released inhibit bits to allow HSQ trying to send request 2228 * again in non-atomic context. So we should not finish this request 2229 * here. 2230 */ 2231 if (!sdhci_send_command(host, cmd)) 2232 ret = -EBUSY; 2233 else 2234 sdhci_led_activate(host); 2235 2236 out_finish: 2237 spin_unlock_irqrestore(&host->lock, flags); 2238 return ret; 2239 } 2240 EXPORT_SYMBOL_GPL(sdhci_request_atomic); 2241 2242 void sdhci_set_bus_width(struct sdhci_host *host, int width) 2243 { 2244 u8 ctrl; 2245 2246 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 2247 if (width == MMC_BUS_WIDTH_8) { 2248 ctrl &= ~SDHCI_CTRL_4BITBUS; 2249 ctrl |= SDHCI_CTRL_8BITBUS; 2250 } else { 2251 if (host->mmc->caps & MMC_CAP_8_BIT_DATA) 2252 ctrl &= ~SDHCI_CTRL_8BITBUS; 2253 if (width == MMC_BUS_WIDTH_4) 2254 ctrl |= SDHCI_CTRL_4BITBUS; 2255 else 2256 ctrl &= ~SDHCI_CTRL_4BITBUS; 2257 } 2258 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 2259 } 2260 EXPORT_SYMBOL_GPL(sdhci_set_bus_width); 2261 2262 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing) 2263 { 2264 u16 ctrl_2; 2265 2266 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2267 /* Select Bus Speed Mode for host */ 2268 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 2269 if ((timing == MMC_TIMING_MMC_HS200) || 2270 (timing == MMC_TIMING_UHS_SDR104)) 2271 ctrl_2 |= SDHCI_CTRL_UHS_SDR104; 2272 else if (timing == MMC_TIMING_UHS_SDR12) 2273 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 2274 else if (timing == MMC_TIMING_UHS_SDR25) 2275 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 2276 else if (timing == MMC_TIMING_UHS_SDR50) 2277 ctrl_2 |= SDHCI_CTRL_UHS_SDR50; 2278 else if ((timing == MMC_TIMING_UHS_DDR50) || 2279 (timing == MMC_TIMING_MMC_DDR52)) 2280 ctrl_2 |= SDHCI_CTRL_UHS_DDR50; 2281 else if (timing == MMC_TIMING_MMC_HS400) 2282 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */ 2283 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 2284 } 2285 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling); 2286 2287 static bool sdhci_timing_has_preset(unsigned char timing) 2288 { 2289 switch (timing) { 2290 case MMC_TIMING_UHS_SDR12: 2291 case MMC_TIMING_UHS_SDR25: 2292 case MMC_TIMING_UHS_SDR50: 2293 case MMC_TIMING_UHS_SDR104: 2294 case MMC_TIMING_UHS_DDR50: 2295 case MMC_TIMING_MMC_DDR52: 2296 return true; 2297 } 2298 return false; 2299 } 2300 2301 static bool sdhci_preset_needed(struct sdhci_host *host, unsigned char timing) 2302 { 2303 return !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) && 2304 sdhci_timing_has_preset(timing); 2305 } 2306 2307 static bool sdhci_presetable_values_change(struct sdhci_host *host, struct mmc_ios *ios) 2308 { 2309 /* 2310 * Preset Values are: Driver Strength, Clock Generator and SDCLK/RCLK 2311 * Frequency. Check if preset values need to be enabled, or the Driver 2312 * Strength needs updating. Note, clock changes are handled separately. 2313 */ 2314 return !host->preset_enabled && 2315 (sdhci_preset_needed(host, ios->timing) || host->drv_type != ios->drv_type); 2316 } 2317 2318 void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 2319 { 2320 struct sdhci_host *host = mmc_priv(mmc); 2321 bool reinit_uhs = host->reinit_uhs; 2322 bool turning_on_clk = false; 2323 u8 ctrl; 2324 2325 host->reinit_uhs = false; 2326 2327 if (ios->power_mode == MMC_POWER_UNDEFINED) 2328 return; 2329 2330 if (host->flags & SDHCI_DEVICE_DEAD) { 2331 if (!IS_ERR(mmc->supply.vmmc) && 2332 ios->power_mode == MMC_POWER_OFF) 2333 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 2334 return; 2335 } 2336 2337 /* 2338 * Reset the chip on each power off. 2339 * Should clear out any weird states. 2340 */ 2341 if (ios->power_mode == MMC_POWER_OFF) { 2342 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 2343 sdhci_reinit(host); 2344 } 2345 2346 if (host->version >= SDHCI_SPEC_300 && 2347 (ios->power_mode == MMC_POWER_UP) && 2348 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) 2349 sdhci_enable_preset_value(host, false); 2350 2351 if (!ios->clock || ios->clock != host->clock) { 2352 turning_on_clk = ios->clock && !host->clock; 2353 2354 host->ops->set_clock(host, ios->clock); 2355 host->clock = ios->clock; 2356 2357 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK && 2358 host->clock) { 2359 host->timeout_clk = mmc->actual_clock ? 2360 mmc->actual_clock / 1000 : 2361 host->clock / 1000; 2362 mmc->max_busy_timeout = 2363 host->ops->get_max_timeout_count ? 2364 host->ops->get_max_timeout_count(host) : 2365 1 << 27; 2366 mmc->max_busy_timeout /= host->timeout_clk; 2367 } 2368 } 2369 2370 if (host->ops->set_power) 2371 host->ops->set_power(host, ios->power_mode, ios->vdd); 2372 else 2373 sdhci_set_power(host, ios->power_mode, ios->vdd); 2374 2375 if (host->ops->platform_send_init_74_clocks) 2376 host->ops->platform_send_init_74_clocks(host, ios->power_mode); 2377 2378 host->ops->set_bus_width(host, ios->bus_width); 2379 2380 /* 2381 * Special case to avoid multiple clock changes during voltage 2382 * switching. 2383 */ 2384 if (!reinit_uhs && 2385 turning_on_clk && 2386 host->timing == ios->timing && 2387 host->version >= SDHCI_SPEC_300 && 2388 !sdhci_presetable_values_change(host, ios)) 2389 return; 2390 2391 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 2392 2393 if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) { 2394 if (ios->timing == MMC_TIMING_SD_HS || 2395 ios->timing == MMC_TIMING_MMC_HS || 2396 ios->timing == MMC_TIMING_MMC_HS400 || 2397 ios->timing == MMC_TIMING_MMC_HS200 || 2398 ios->timing == MMC_TIMING_MMC_DDR52 || 2399 ios->timing == MMC_TIMING_UHS_SDR50 || 2400 ios->timing == MMC_TIMING_UHS_SDR104 || 2401 ios->timing == MMC_TIMING_UHS_DDR50 || 2402 ios->timing == MMC_TIMING_UHS_SDR25) 2403 ctrl |= SDHCI_CTRL_HISPD; 2404 else 2405 ctrl &= ~SDHCI_CTRL_HISPD; 2406 } 2407 2408 if (host->version >= SDHCI_SPEC_300) { 2409 u16 clk, ctrl_2; 2410 2411 /* 2412 * According to SDHCI Spec v3.00, if the Preset Value 2413 * Enable in the Host Control 2 register is set, we 2414 * need to reset SD Clock Enable before changing High 2415 * Speed Enable to avoid generating clock glitches. 2416 */ 2417 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 2418 if (clk & SDHCI_CLOCK_CARD_EN) { 2419 clk &= ~SDHCI_CLOCK_CARD_EN; 2420 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 2421 } 2422 2423 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 2424 2425 if (!host->preset_enabled) { 2426 /* 2427 * We only need to set Driver Strength if the 2428 * preset value enable is not set. 2429 */ 2430 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2431 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK; 2432 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A) 2433 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A; 2434 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B) 2435 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B; 2436 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C) 2437 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; 2438 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D) 2439 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D; 2440 else { 2441 pr_warn("%s: invalid driver type, default to driver type B\n", 2442 mmc_hostname(mmc)); 2443 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B; 2444 } 2445 2446 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 2447 host->drv_type = ios->drv_type; 2448 } 2449 2450 host->ops->set_uhs_signaling(host, ios->timing); 2451 host->timing = ios->timing; 2452 2453 if (sdhci_preset_needed(host, ios->timing)) { 2454 u16 preset; 2455 2456 sdhci_enable_preset_value(host, true); 2457 preset = sdhci_get_preset_value(host); 2458 ios->drv_type = FIELD_GET(SDHCI_PRESET_DRV_MASK, 2459 preset); 2460 host->drv_type = ios->drv_type; 2461 } 2462 2463 /* Re-enable SD Clock */ 2464 host->ops->set_clock(host, host->clock); 2465 } else 2466 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 2467 } 2468 EXPORT_SYMBOL_GPL(sdhci_set_ios); 2469 2470 static int sdhci_get_cd(struct mmc_host *mmc) 2471 { 2472 struct sdhci_host *host = mmc_priv(mmc); 2473 int gpio_cd = mmc_gpio_get_cd(mmc); 2474 2475 if (host->flags & SDHCI_DEVICE_DEAD) 2476 return 0; 2477 2478 /* If nonremovable, assume that the card is always present. */ 2479 if (!mmc_card_is_removable(mmc)) 2480 return 1; 2481 2482 /* 2483 * Try slot gpio detect, if defined it take precedence 2484 * over build in controller functionality 2485 */ 2486 if (gpio_cd >= 0) 2487 return !!gpio_cd; 2488 2489 /* If polling, assume that the card is always present. */ 2490 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) 2491 return 1; 2492 2493 /* Host native card detect */ 2494 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); 2495 } 2496 2497 int sdhci_get_cd_nogpio(struct mmc_host *mmc) 2498 { 2499 struct sdhci_host *host = mmc_priv(mmc); 2500 unsigned long flags; 2501 int ret = 0; 2502 2503 spin_lock_irqsave(&host->lock, flags); 2504 2505 if (host->flags & SDHCI_DEVICE_DEAD) 2506 goto out; 2507 2508 ret = !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); 2509 out: 2510 spin_unlock_irqrestore(&host->lock, flags); 2511 2512 return ret; 2513 } 2514 EXPORT_SYMBOL_GPL(sdhci_get_cd_nogpio); 2515 2516 static int sdhci_check_ro(struct sdhci_host *host) 2517 { 2518 unsigned long flags; 2519 int is_readonly; 2520 2521 spin_lock_irqsave(&host->lock, flags); 2522 2523 if (host->flags & SDHCI_DEVICE_DEAD) 2524 is_readonly = 0; 2525 else if (host->ops->get_ro) 2526 is_readonly = host->ops->get_ro(host); 2527 else if (mmc_can_gpio_ro(host->mmc)) 2528 is_readonly = mmc_gpio_get_ro(host->mmc); 2529 else 2530 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) 2531 & SDHCI_WRITE_PROTECT); 2532 2533 spin_unlock_irqrestore(&host->lock, flags); 2534 2535 /* This quirk needs to be replaced by a callback-function later */ 2536 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ? 2537 !is_readonly : is_readonly; 2538 } 2539 2540 #define SAMPLE_COUNT 5 2541 2542 static int sdhci_get_ro(struct mmc_host *mmc) 2543 { 2544 struct sdhci_host *host = mmc_priv(mmc); 2545 int i, ro_count; 2546 2547 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT)) 2548 return sdhci_check_ro(host); 2549 2550 ro_count = 0; 2551 for (i = 0; i < SAMPLE_COUNT; i++) { 2552 if (sdhci_check_ro(host)) { 2553 if (++ro_count > SAMPLE_COUNT / 2) 2554 return 1; 2555 } 2556 msleep(30); 2557 } 2558 return 0; 2559 } 2560 2561 static void sdhci_hw_reset(struct mmc_host *mmc) 2562 { 2563 struct sdhci_host *host = mmc_priv(mmc); 2564 2565 if (host->ops && host->ops->hw_reset) 2566 host->ops->hw_reset(host); 2567 } 2568 2569 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable) 2570 { 2571 if (!(host->flags & SDHCI_DEVICE_DEAD)) { 2572 if (enable) 2573 host->ier |= SDHCI_INT_CARD_INT; 2574 else 2575 host->ier &= ~SDHCI_INT_CARD_INT; 2576 2577 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 2578 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 2579 } 2580 } 2581 2582 void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) 2583 { 2584 struct sdhci_host *host = mmc_priv(mmc); 2585 unsigned long flags; 2586 2587 if (enable) 2588 pm_runtime_get_noresume(mmc_dev(mmc)); 2589 2590 spin_lock_irqsave(&host->lock, flags); 2591 sdhci_enable_sdio_irq_nolock(host, enable); 2592 spin_unlock_irqrestore(&host->lock, flags); 2593 2594 if (!enable) 2595 pm_runtime_put_noidle(mmc_dev(mmc)); 2596 } 2597 EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq); 2598 2599 static void sdhci_ack_sdio_irq(struct mmc_host *mmc) 2600 { 2601 struct sdhci_host *host = mmc_priv(mmc); 2602 unsigned long flags; 2603 2604 spin_lock_irqsave(&host->lock, flags); 2605 sdhci_enable_sdio_irq_nolock(host, true); 2606 spin_unlock_irqrestore(&host->lock, flags); 2607 } 2608 2609 int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, 2610 struct mmc_ios *ios) 2611 { 2612 struct sdhci_host *host = mmc_priv(mmc); 2613 u16 ctrl; 2614 int ret; 2615 2616 /* 2617 * Signal Voltage Switching is only applicable for Host Controllers 2618 * v3.00 and above. 2619 */ 2620 if (host->version < SDHCI_SPEC_300) 2621 return 0; 2622 2623 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2624 2625 switch (ios->signal_voltage) { 2626 case MMC_SIGNAL_VOLTAGE_330: 2627 if (!(host->flags & SDHCI_SIGNALING_330)) 2628 return -EINVAL; 2629 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ 2630 ctrl &= ~SDHCI_CTRL_VDD_180; 2631 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2632 2633 if (!IS_ERR(mmc->supply.vqmmc)) { 2634 ret = mmc_regulator_set_vqmmc(mmc, ios); 2635 if (ret < 0) { 2636 pr_warn("%s: Switching to 3.3V signalling voltage failed\n", 2637 mmc_hostname(mmc)); 2638 return -EIO; 2639 } 2640 } 2641 /* Wait for 5ms */ 2642 usleep_range(5000, 5500); 2643 2644 /* 3.3V regulator output should be stable within 5 ms */ 2645 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2646 if (!(ctrl & SDHCI_CTRL_VDD_180)) 2647 return 0; 2648 2649 pr_warn("%s: 3.3V regulator output did not become stable\n", 2650 mmc_hostname(mmc)); 2651 2652 return -EAGAIN; 2653 case MMC_SIGNAL_VOLTAGE_180: 2654 if (!(host->flags & SDHCI_SIGNALING_180)) 2655 return -EINVAL; 2656 if (!IS_ERR(mmc->supply.vqmmc)) { 2657 ret = mmc_regulator_set_vqmmc(mmc, ios); 2658 if (ret < 0) { 2659 pr_warn("%s: Switching to 1.8V signalling voltage failed\n", 2660 mmc_hostname(mmc)); 2661 return -EIO; 2662 } 2663 } 2664 2665 /* 2666 * Enable 1.8V Signal Enable in the Host Control2 2667 * register 2668 */ 2669 ctrl |= SDHCI_CTRL_VDD_180; 2670 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2671 2672 /* Some controller need to do more when switching */ 2673 if (host->ops->voltage_switch) 2674 host->ops->voltage_switch(host); 2675 2676 /* 1.8V regulator output should be stable within 5 ms */ 2677 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2678 if (ctrl & SDHCI_CTRL_VDD_180) 2679 return 0; 2680 2681 pr_warn("%s: 1.8V regulator output did not become stable\n", 2682 mmc_hostname(mmc)); 2683 2684 return -EAGAIN; 2685 case MMC_SIGNAL_VOLTAGE_120: 2686 if (!(host->flags & SDHCI_SIGNALING_120)) 2687 return -EINVAL; 2688 if (!IS_ERR(mmc->supply.vqmmc)) { 2689 ret = mmc_regulator_set_vqmmc(mmc, ios); 2690 if (ret < 0) { 2691 pr_warn("%s: Switching to 1.2V signalling voltage failed\n", 2692 mmc_hostname(mmc)); 2693 return -EIO; 2694 } 2695 } 2696 return 0; 2697 default: 2698 /* No signal voltage switch required */ 2699 return 0; 2700 } 2701 } 2702 EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch); 2703 2704 static int sdhci_card_busy(struct mmc_host *mmc) 2705 { 2706 struct sdhci_host *host = mmc_priv(mmc); 2707 u32 present_state; 2708 2709 /* Check whether DAT[0] is 0 */ 2710 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE); 2711 2712 return !(present_state & SDHCI_DATA_0_LVL_MASK); 2713 } 2714 2715 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios) 2716 { 2717 struct sdhci_host *host = mmc_priv(mmc); 2718 unsigned long flags; 2719 2720 spin_lock_irqsave(&host->lock, flags); 2721 host->flags |= SDHCI_HS400_TUNING; 2722 spin_unlock_irqrestore(&host->lock, flags); 2723 2724 return 0; 2725 } 2726 2727 void sdhci_start_tuning(struct sdhci_host *host) 2728 { 2729 u16 ctrl; 2730 2731 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2732 ctrl |= SDHCI_CTRL_EXEC_TUNING; 2733 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND) 2734 ctrl |= SDHCI_CTRL_TUNED_CLK; 2735 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2736 2737 /* 2738 * As per the Host Controller spec v3.00, tuning command 2739 * generates Buffer Read Ready interrupt, so enable that. 2740 * 2741 * Note: The spec clearly says that when tuning sequence 2742 * is being performed, the controller does not generate 2743 * interrupts other than Buffer Read Ready interrupt. But 2744 * to make sure we don't hit a controller bug, we _only_ 2745 * enable Buffer Read Ready interrupt here. 2746 */ 2747 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE); 2748 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE); 2749 } 2750 EXPORT_SYMBOL_GPL(sdhci_start_tuning); 2751 2752 void sdhci_end_tuning(struct sdhci_host *host) 2753 { 2754 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 2755 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 2756 } 2757 EXPORT_SYMBOL_GPL(sdhci_end_tuning); 2758 2759 void sdhci_reset_tuning(struct sdhci_host *host) 2760 { 2761 u16 ctrl; 2762 2763 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2764 ctrl &= ~SDHCI_CTRL_TUNED_CLK; 2765 ctrl &= ~SDHCI_CTRL_EXEC_TUNING; 2766 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2767 } 2768 EXPORT_SYMBOL_GPL(sdhci_reset_tuning); 2769 2770 void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode) 2771 { 2772 sdhci_reset_tuning(host); 2773 2774 sdhci_reset_for(host, TUNING_ABORT); 2775 2776 sdhci_end_tuning(host); 2777 2778 mmc_send_abort_tuning(host->mmc, opcode); 2779 } 2780 EXPORT_SYMBOL_GPL(sdhci_abort_tuning); 2781 2782 /* 2783 * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI 2784 * tuning command does not have a data payload (or rather the hardware does it 2785 * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command 2786 * interrupt setup is different to other commands and there is no timeout 2787 * interrupt so special handling is needed. 2788 */ 2789 void sdhci_send_tuning(struct sdhci_host *host, u32 opcode) 2790 { 2791 struct mmc_host *mmc = host->mmc; 2792 struct mmc_command cmd = {}; 2793 struct mmc_request mrq = {}; 2794 unsigned long flags; 2795 u32 b = host->sdma_boundary; 2796 2797 spin_lock_irqsave(&host->lock, flags); 2798 2799 cmd.opcode = opcode; 2800 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 2801 cmd.mrq = &mrq; 2802 2803 mrq.cmd = &cmd; 2804 /* 2805 * In response to CMD19, the card sends 64 bytes of tuning 2806 * block to the Host Controller. So we set the block size 2807 * to 64 here. 2808 */ 2809 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 && 2810 mmc->ios.bus_width == MMC_BUS_WIDTH_8) 2811 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE); 2812 else 2813 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE); 2814 2815 /* 2816 * The tuning block is sent by the card to the host controller. 2817 * So we set the TRNS_READ bit in the Transfer Mode register. 2818 * This also takes care of setting DMA Enable and Multi Block 2819 * Select in the same register to 0. 2820 */ 2821 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE); 2822 2823 if (!sdhci_send_command_retry(host, &cmd, flags)) { 2824 spin_unlock_irqrestore(&host->lock, flags); 2825 host->tuning_done = 0; 2826 return; 2827 } 2828 2829 host->cmd = NULL; 2830 2831 sdhci_del_timer(host, &mrq); 2832 2833 host->tuning_done = 0; 2834 2835 spin_unlock_irqrestore(&host->lock, flags); 2836 2837 /* Wait for Buffer Read Ready interrupt */ 2838 wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1), 2839 msecs_to_jiffies(50)); 2840 2841 } 2842 EXPORT_SYMBOL_GPL(sdhci_send_tuning); 2843 2844 static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) 2845 { 2846 int i; 2847 2848 /* 2849 * Issue opcode repeatedly till Execute Tuning is set to 0 or the number 2850 * of loops reaches tuning loop count. 2851 */ 2852 for (i = 0; i < host->tuning_loop_count; i++) { 2853 u16 ctrl; 2854 2855 sdhci_send_tuning(host, opcode); 2856 2857 if (!host->tuning_done) { 2858 pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n", 2859 mmc_hostname(host->mmc)); 2860 sdhci_abort_tuning(host, opcode); 2861 return -ETIMEDOUT; 2862 } 2863 2864 /* Spec does not require a delay between tuning cycles */ 2865 if (host->tuning_delay > 0) 2866 mdelay(host->tuning_delay); 2867 2868 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2869 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) { 2870 if (ctrl & SDHCI_CTRL_TUNED_CLK) 2871 return 0; /* Success! */ 2872 break; 2873 } 2874 2875 } 2876 2877 pr_info("%s: Tuning failed, falling back to fixed sampling clock\n", 2878 mmc_hostname(host->mmc)); 2879 sdhci_reset_tuning(host); 2880 return -EAGAIN; 2881 } 2882 2883 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) 2884 { 2885 struct sdhci_host *host = mmc_priv(mmc); 2886 int err = 0; 2887 unsigned int tuning_count = 0; 2888 bool hs400_tuning; 2889 2890 hs400_tuning = host->flags & SDHCI_HS400_TUNING; 2891 2892 if (host->tuning_mode == SDHCI_TUNING_MODE_1) 2893 tuning_count = host->tuning_count; 2894 2895 /* 2896 * The Host Controller needs tuning in case of SDR104 and DDR50 2897 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in 2898 * the Capabilities register. 2899 * If the Host Controller supports the HS200 mode then the 2900 * tuning function has to be executed. 2901 */ 2902 switch (host->timing) { 2903 /* HS400 tuning is done in HS200 mode */ 2904 case MMC_TIMING_MMC_HS400: 2905 err = -EINVAL; 2906 goto out; 2907 2908 case MMC_TIMING_MMC_HS200: 2909 /* 2910 * Periodic re-tuning for HS400 is not expected to be needed, so 2911 * disable it here. 2912 */ 2913 if (hs400_tuning) 2914 tuning_count = 0; 2915 break; 2916 2917 case MMC_TIMING_UHS_SDR104: 2918 case MMC_TIMING_UHS_DDR50: 2919 break; 2920 2921 case MMC_TIMING_UHS_SDR50: 2922 if (host->flags & SDHCI_SDR50_NEEDS_TUNING) 2923 break; 2924 fallthrough; 2925 2926 default: 2927 goto out; 2928 } 2929 2930 if (host->ops->platform_execute_tuning) { 2931 err = host->ops->platform_execute_tuning(host, opcode); 2932 goto out; 2933 } 2934 2935 mmc->retune_period = tuning_count; 2936 2937 if (host->tuning_delay < 0) 2938 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK; 2939 2940 sdhci_start_tuning(host); 2941 2942 host->tuning_err = __sdhci_execute_tuning(host, opcode); 2943 2944 sdhci_end_tuning(host); 2945 out: 2946 host->flags &= ~SDHCI_HS400_TUNING; 2947 2948 return err; 2949 } 2950 EXPORT_SYMBOL_GPL(sdhci_execute_tuning); 2951 2952 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable) 2953 { 2954 /* Host Controller v3.00 defines preset value registers */ 2955 if (host->version < SDHCI_SPEC_300) 2956 return; 2957 2958 /* 2959 * We only enable or disable Preset Value if they are not already 2960 * enabled or disabled respectively. Otherwise, we bail out. 2961 */ 2962 if (host->preset_enabled != enable) { 2963 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2964 2965 if (enable) 2966 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE; 2967 else 2968 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE; 2969 2970 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2971 2972 if (enable) 2973 host->flags |= SDHCI_PV_ENABLED; 2974 else 2975 host->flags &= ~SDHCI_PV_ENABLED; 2976 2977 host->preset_enabled = enable; 2978 } 2979 } 2980 2981 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq, 2982 int err) 2983 { 2984 struct mmc_data *data = mrq->data; 2985 2986 if (data->host_cookie != COOKIE_UNMAPPED) 2987 dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len, 2988 mmc_get_dma_dir(data)); 2989 2990 data->host_cookie = COOKIE_UNMAPPED; 2991 } 2992 2993 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq) 2994 { 2995 struct sdhci_host *host = mmc_priv(mmc); 2996 2997 mrq->data->host_cookie = COOKIE_UNMAPPED; 2998 2999 /* 3000 * No pre-mapping in the pre hook if we're using the bounce buffer, 3001 * for that we would need two bounce buffers since one buffer is 3002 * in flight when this is getting called. 3003 */ 3004 if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer) 3005 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED); 3006 } 3007 3008 static void sdhci_error_out_mrqs(struct sdhci_host *host, int err) 3009 { 3010 if (host->data_cmd) { 3011 host->data_cmd->error = err; 3012 sdhci_finish_mrq(host, host->data_cmd->mrq); 3013 } 3014 3015 if (host->cmd) { 3016 host->cmd->error = err; 3017 sdhci_finish_mrq(host, host->cmd->mrq); 3018 } 3019 } 3020 3021 static void sdhci_card_event(struct mmc_host *mmc) 3022 { 3023 struct sdhci_host *host = mmc_priv(mmc); 3024 unsigned long flags; 3025 int present; 3026 3027 /* First check if client has provided their own card event */ 3028 if (host->ops->card_event) 3029 host->ops->card_event(host); 3030 3031 present = mmc->ops->get_cd(mmc); 3032 3033 spin_lock_irqsave(&host->lock, flags); 3034 3035 /* Check sdhci_has_requests() first in case we are runtime suspended */ 3036 if (sdhci_has_requests(host) && !present) { 3037 pr_err("%s: Card removed during transfer!\n", 3038 mmc_hostname(mmc)); 3039 pr_err("%s: Resetting controller.\n", 3040 mmc_hostname(mmc)); 3041 3042 sdhci_reset_for(host, CARD_REMOVED); 3043 3044 sdhci_error_out_mrqs(host, -ENOMEDIUM); 3045 } 3046 3047 spin_unlock_irqrestore(&host->lock, flags); 3048 } 3049 3050 static const struct mmc_host_ops sdhci_ops = { 3051 .request = sdhci_request, 3052 .post_req = sdhci_post_req, 3053 .pre_req = sdhci_pre_req, 3054 .set_ios = sdhci_set_ios, 3055 .get_cd = sdhci_get_cd, 3056 .get_ro = sdhci_get_ro, 3057 .card_hw_reset = sdhci_hw_reset, 3058 .enable_sdio_irq = sdhci_enable_sdio_irq, 3059 .ack_sdio_irq = sdhci_ack_sdio_irq, 3060 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch, 3061 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning, 3062 .execute_tuning = sdhci_execute_tuning, 3063 .card_event = sdhci_card_event, 3064 .card_busy = sdhci_card_busy, 3065 }; 3066 3067 /*****************************************************************************\ 3068 * * 3069 * Request done * 3070 * * 3071 \*****************************************************************************/ 3072 3073 static bool sdhci_request_done(struct sdhci_host *host) 3074 { 3075 unsigned long flags; 3076 struct mmc_request *mrq; 3077 int i; 3078 3079 spin_lock_irqsave(&host->lock, flags); 3080 3081 for (i = 0; i < SDHCI_MAX_MRQS; i++) { 3082 mrq = host->mrqs_done[i]; 3083 if (mrq) 3084 break; 3085 } 3086 3087 if (!mrq) { 3088 spin_unlock_irqrestore(&host->lock, flags); 3089 return true; 3090 } 3091 3092 /* 3093 * The controller needs a reset of internal state machines 3094 * upon error conditions. 3095 */ 3096 if (sdhci_needs_reset(host, mrq)) { 3097 /* 3098 * Do not finish until command and data lines are available for 3099 * reset. Note there can only be one other mrq, so it cannot 3100 * also be in mrqs_done, otherwise host->cmd and host->data_cmd 3101 * would both be null. 3102 */ 3103 if (host->cmd || host->data_cmd) { 3104 spin_unlock_irqrestore(&host->lock, flags); 3105 return true; 3106 } 3107 3108 /* Some controllers need this kick or reset won't work here */ 3109 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) 3110 /* This is to force an update */ 3111 host->ops->set_clock(host, host->clock); 3112 3113 sdhci_reset_for(host, REQUEST_ERROR); 3114 3115 host->pending_reset = false; 3116 } 3117 3118 /* 3119 * Always unmap the data buffers if they were mapped by 3120 * sdhci_prepare_data() whenever we finish with a request. 3121 * This avoids leaking DMA mappings on error. 3122 */ 3123 if (host->flags & SDHCI_REQ_USE_DMA) { 3124 struct mmc_data *data = mrq->data; 3125 3126 if (host->use_external_dma && data && 3127 (mrq->cmd->error || data->error)) { 3128 struct dma_chan *chan = sdhci_external_dma_channel(host, data); 3129 3130 host->mrqs_done[i] = NULL; 3131 spin_unlock_irqrestore(&host->lock, flags); 3132 dmaengine_terminate_sync(chan); 3133 spin_lock_irqsave(&host->lock, flags); 3134 sdhci_set_mrq_done(host, mrq); 3135 } 3136 3137 if (data && data->host_cookie == COOKIE_MAPPED) { 3138 if (host->bounce_buffer) { 3139 /* 3140 * On reads, copy the bounced data into the 3141 * sglist 3142 */ 3143 if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) { 3144 unsigned int length = data->bytes_xfered; 3145 3146 if (length > host->bounce_buffer_size) { 3147 pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n", 3148 mmc_hostname(host->mmc), 3149 host->bounce_buffer_size, 3150 data->bytes_xfered); 3151 /* Cap it down and continue */ 3152 length = host->bounce_buffer_size; 3153 } 3154 dma_sync_single_for_cpu( 3155 mmc_dev(host->mmc), 3156 host->bounce_addr, 3157 host->bounce_buffer_size, 3158 DMA_FROM_DEVICE); 3159 sg_copy_from_buffer(data->sg, 3160 data->sg_len, 3161 host->bounce_buffer, 3162 length); 3163 } else { 3164 /* No copying, just switch ownership */ 3165 dma_sync_single_for_cpu( 3166 mmc_dev(host->mmc), 3167 host->bounce_addr, 3168 host->bounce_buffer_size, 3169 mmc_get_dma_dir(data)); 3170 } 3171 } else { 3172 /* Unmap the raw data */ 3173 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 3174 data->sg_len, 3175 mmc_get_dma_dir(data)); 3176 } 3177 data->host_cookie = COOKIE_UNMAPPED; 3178 } 3179 } 3180 3181 host->mrqs_done[i] = NULL; 3182 3183 spin_unlock_irqrestore(&host->lock, flags); 3184 3185 if (host->ops->request_done) 3186 host->ops->request_done(host, mrq); 3187 else 3188 mmc_request_done(host->mmc, mrq); 3189 3190 return false; 3191 } 3192 3193 static void sdhci_complete_work(struct work_struct *work) 3194 { 3195 struct sdhci_host *host = container_of(work, struct sdhci_host, 3196 complete_work); 3197 3198 while (!sdhci_request_done(host)) 3199 ; 3200 } 3201 3202 static void sdhci_timeout_timer(struct timer_list *t) 3203 { 3204 struct sdhci_host *host; 3205 unsigned long flags; 3206 3207 host = from_timer(host, t, timer); 3208 3209 spin_lock_irqsave(&host->lock, flags); 3210 3211 if (host->cmd && !sdhci_data_line_cmd(host->cmd)) { 3212 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n", 3213 mmc_hostname(host->mmc)); 3214 sdhci_err_stats_inc(host, REQ_TIMEOUT); 3215 sdhci_dumpregs(host); 3216 3217 host->cmd->error = -ETIMEDOUT; 3218 sdhci_finish_mrq(host, host->cmd->mrq); 3219 } 3220 3221 spin_unlock_irqrestore(&host->lock, flags); 3222 } 3223 3224 static void sdhci_timeout_data_timer(struct timer_list *t) 3225 { 3226 struct sdhci_host *host; 3227 unsigned long flags; 3228 3229 host = from_timer(host, t, data_timer); 3230 3231 spin_lock_irqsave(&host->lock, flags); 3232 3233 if (host->data || host->data_cmd || 3234 (host->cmd && sdhci_data_line_cmd(host->cmd))) { 3235 pr_err("%s: Timeout waiting for hardware interrupt.\n", 3236 mmc_hostname(host->mmc)); 3237 sdhci_err_stats_inc(host, REQ_TIMEOUT); 3238 sdhci_dumpregs(host); 3239 3240 if (host->data) { 3241 host->data->error = -ETIMEDOUT; 3242 __sdhci_finish_data(host, true); 3243 queue_work(host->complete_wq, &host->complete_work); 3244 } else if (host->data_cmd) { 3245 host->data_cmd->error = -ETIMEDOUT; 3246 sdhci_finish_mrq(host, host->data_cmd->mrq); 3247 } else { 3248 host->cmd->error = -ETIMEDOUT; 3249 sdhci_finish_mrq(host, host->cmd->mrq); 3250 } 3251 } 3252 3253 spin_unlock_irqrestore(&host->lock, flags); 3254 } 3255 3256 /*****************************************************************************\ 3257 * * 3258 * Interrupt handling * 3259 * * 3260 \*****************************************************************************/ 3261 3262 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p) 3263 { 3264 /* Handle auto-CMD12 error */ 3265 if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) { 3266 struct mmc_request *mrq = host->data_cmd->mrq; 3267 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS); 3268 int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ? 3269 SDHCI_INT_DATA_TIMEOUT : 3270 SDHCI_INT_DATA_CRC; 3271 3272 /* Treat auto-CMD12 error the same as data error */ 3273 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) { 3274 *intmask_p |= data_err_bit; 3275 return; 3276 } 3277 } 3278 3279 if (!host->cmd) { 3280 /* 3281 * SDHCI recovers from errors by resetting the cmd and data 3282 * circuits. Until that is done, there very well might be more 3283 * interrupts, so ignore them in that case. 3284 */ 3285 if (host->pending_reset) 3286 return; 3287 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n", 3288 mmc_hostname(host->mmc), (unsigned)intmask); 3289 sdhci_err_stats_inc(host, UNEXPECTED_IRQ); 3290 sdhci_dumpregs(host); 3291 return; 3292 } 3293 3294 if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC | 3295 SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) { 3296 if (intmask & SDHCI_INT_TIMEOUT) { 3297 host->cmd->error = -ETIMEDOUT; 3298 sdhci_err_stats_inc(host, CMD_TIMEOUT); 3299 } else { 3300 host->cmd->error = -EILSEQ; 3301 if (!mmc_op_tuning(host->cmd->opcode)) 3302 sdhci_err_stats_inc(host, CMD_CRC); 3303 } 3304 /* Treat data command CRC error the same as data CRC error */ 3305 if (host->cmd->data && 3306 (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) == 3307 SDHCI_INT_CRC) { 3308 host->cmd = NULL; 3309 *intmask_p |= SDHCI_INT_DATA_CRC; 3310 return; 3311 } 3312 3313 __sdhci_finish_mrq(host, host->cmd->mrq); 3314 return; 3315 } 3316 3317 /* Handle auto-CMD23 error */ 3318 if (intmask & SDHCI_INT_AUTO_CMD_ERR) { 3319 struct mmc_request *mrq = host->cmd->mrq; 3320 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS); 3321 int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ? 3322 -ETIMEDOUT : 3323 -EILSEQ; 3324 3325 sdhci_err_stats_inc(host, AUTO_CMD); 3326 3327 if (sdhci_auto_cmd23(host, mrq)) { 3328 mrq->sbc->error = err; 3329 __sdhci_finish_mrq(host, mrq); 3330 return; 3331 } 3332 } 3333 3334 if (intmask & SDHCI_INT_RESPONSE) 3335 sdhci_finish_command(host); 3336 } 3337 3338 static void sdhci_adma_show_error(struct sdhci_host *host) 3339 { 3340 void *desc = host->adma_table; 3341 dma_addr_t dma = host->adma_addr; 3342 3343 sdhci_dumpregs(host); 3344 3345 while (true) { 3346 struct sdhci_adma2_64_desc *dma_desc = desc; 3347 3348 if (host->flags & SDHCI_USE_64_BIT_DMA) 3349 SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n", 3350 (unsigned long long)dma, 3351 le32_to_cpu(dma_desc->addr_hi), 3352 le32_to_cpu(dma_desc->addr_lo), 3353 le16_to_cpu(dma_desc->len), 3354 le16_to_cpu(dma_desc->cmd)); 3355 else 3356 SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n", 3357 (unsigned long long)dma, 3358 le32_to_cpu(dma_desc->addr_lo), 3359 le16_to_cpu(dma_desc->len), 3360 le16_to_cpu(dma_desc->cmd)); 3361 3362 desc += host->desc_sz; 3363 dma += host->desc_sz; 3364 3365 if (dma_desc->cmd & cpu_to_le16(ADMA2_END)) 3366 break; 3367 } 3368 } 3369 3370 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) 3371 { 3372 /* 3373 * CMD19 generates _only_ Buffer Read Ready interrupt if 3374 * use sdhci_send_tuning. 3375 * Need to exclude this case: PIO mode and use mmc_send_tuning, 3376 * If not, sdhci_transfer_pio will never be called, make the 3377 * SDHCI_INT_DATA_AVAIL always there, stuck in irq storm. 3378 */ 3379 if (intmask & SDHCI_INT_DATA_AVAIL && !host->data) { 3380 if (mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) { 3381 host->tuning_done = 1; 3382 wake_up(&host->buf_ready_int); 3383 return; 3384 } 3385 } 3386 3387 if (!host->data) { 3388 struct mmc_command *data_cmd = host->data_cmd; 3389 3390 /* 3391 * The "data complete" interrupt is also used to 3392 * indicate that a busy state has ended. See comment 3393 * above in sdhci_cmd_irq(). 3394 */ 3395 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) { 3396 if (intmask & SDHCI_INT_DATA_TIMEOUT) { 3397 host->data_cmd = NULL; 3398 data_cmd->error = -ETIMEDOUT; 3399 sdhci_err_stats_inc(host, CMD_TIMEOUT); 3400 __sdhci_finish_mrq(host, data_cmd->mrq); 3401 return; 3402 } 3403 if (intmask & SDHCI_INT_DATA_END) { 3404 host->data_cmd = NULL; 3405 /* 3406 * Some cards handle busy-end interrupt 3407 * before the command completed, so make 3408 * sure we do things in the proper order. 3409 */ 3410 if (host->cmd == data_cmd) 3411 return; 3412 3413 __sdhci_finish_mrq(host, data_cmd->mrq); 3414 return; 3415 } 3416 } 3417 3418 /* 3419 * SDHCI recovers from errors by resetting the cmd and data 3420 * circuits. Until that is done, there very well might be more 3421 * interrupts, so ignore them in that case. 3422 */ 3423 if (host->pending_reset) 3424 return; 3425 3426 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n", 3427 mmc_hostname(host->mmc), (unsigned)intmask); 3428 sdhci_err_stats_inc(host, UNEXPECTED_IRQ); 3429 sdhci_dumpregs(host); 3430 3431 return; 3432 } 3433 3434 if (intmask & SDHCI_INT_DATA_TIMEOUT) { 3435 host->data->error = -ETIMEDOUT; 3436 sdhci_err_stats_inc(host, DAT_TIMEOUT); 3437 } else if (intmask & SDHCI_INT_DATA_END_BIT) { 3438 host->data->error = -EILSEQ; 3439 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) 3440 sdhci_err_stats_inc(host, DAT_CRC); 3441 } else if ((intmask & SDHCI_INT_DATA_CRC) && 3442 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)) 3443 != MMC_BUS_TEST_R) { 3444 host->data->error = -EILSEQ; 3445 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) 3446 sdhci_err_stats_inc(host, DAT_CRC); 3447 } else if (intmask & SDHCI_INT_ADMA_ERROR) { 3448 pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc), 3449 intmask); 3450 sdhci_adma_show_error(host); 3451 sdhci_err_stats_inc(host, ADMA); 3452 host->data->error = -EIO; 3453 if (host->ops->adma_workaround) 3454 host->ops->adma_workaround(host, intmask); 3455 } 3456 3457 if (host->data->error) 3458 sdhci_finish_data(host); 3459 else { 3460 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)) 3461 sdhci_transfer_pio(host); 3462 3463 /* 3464 * We currently don't do anything fancy with DMA 3465 * boundaries, but as we can't disable the feature 3466 * we need to at least restart the transfer. 3467 * 3468 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS) 3469 * should return a valid address to continue from, but as 3470 * some controllers are faulty, don't trust them. 3471 */ 3472 if (intmask & SDHCI_INT_DMA_END) { 3473 dma_addr_t dmastart, dmanow; 3474 3475 dmastart = sdhci_sdma_address(host); 3476 dmanow = dmastart + host->data->bytes_xfered; 3477 /* 3478 * Force update to the next DMA block boundary. 3479 */ 3480 dmanow = (dmanow & 3481 ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) + 3482 SDHCI_DEFAULT_BOUNDARY_SIZE; 3483 host->data->bytes_xfered = dmanow - dmastart; 3484 DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n", 3485 &dmastart, host->data->bytes_xfered, &dmanow); 3486 sdhci_set_sdma_addr(host, dmanow); 3487 } 3488 3489 if (intmask & SDHCI_INT_DATA_END) { 3490 if (host->cmd == host->data_cmd) { 3491 /* 3492 * Data managed to finish before the 3493 * command completed. Make sure we do 3494 * things in the proper order. 3495 */ 3496 host->data_early = 1; 3497 } else { 3498 sdhci_finish_data(host); 3499 } 3500 } 3501 } 3502 } 3503 3504 static inline bool sdhci_defer_done(struct sdhci_host *host, 3505 struct mmc_request *mrq) 3506 { 3507 struct mmc_data *data = mrq->data; 3508 3509 return host->pending_reset || host->always_defer_done || 3510 ((host->flags & SDHCI_REQ_USE_DMA) && data && 3511 data->host_cookie == COOKIE_MAPPED); 3512 } 3513 3514 static irqreturn_t sdhci_irq(int irq, void *dev_id) 3515 { 3516 struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0}; 3517 irqreturn_t result = IRQ_NONE; 3518 struct sdhci_host *host = dev_id; 3519 u32 intmask, mask, unexpected = 0; 3520 int max_loops = 16; 3521 int i; 3522 3523 spin_lock(&host->lock); 3524 3525 if (host->runtime_suspended) { 3526 spin_unlock(&host->lock); 3527 return IRQ_NONE; 3528 } 3529 3530 intmask = sdhci_readl(host, SDHCI_INT_STATUS); 3531 if (!intmask || intmask == 0xffffffff) { 3532 result = IRQ_NONE; 3533 goto out; 3534 } 3535 3536 do { 3537 DBG("IRQ status 0x%08x\n", intmask); 3538 3539 if (host->ops->irq) { 3540 intmask = host->ops->irq(host, intmask); 3541 if (!intmask) 3542 goto cont; 3543 } 3544 3545 /* Clear selected interrupts. */ 3546 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | 3547 SDHCI_INT_BUS_POWER); 3548 sdhci_writel(host, mask, SDHCI_INT_STATUS); 3549 3550 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { 3551 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 3552 SDHCI_CARD_PRESENT; 3553 3554 /* 3555 * There is a observation on i.mx esdhc. INSERT 3556 * bit will be immediately set again when it gets 3557 * cleared, if a card is inserted. We have to mask 3558 * the irq to prevent interrupt storm which will 3559 * freeze the system. And the REMOVE gets the 3560 * same situation. 3561 * 3562 * More testing are needed here to ensure it works 3563 * for other platforms though. 3564 */ 3565 host->ier &= ~(SDHCI_INT_CARD_INSERT | 3566 SDHCI_INT_CARD_REMOVE); 3567 host->ier |= present ? SDHCI_INT_CARD_REMOVE : 3568 SDHCI_INT_CARD_INSERT; 3569 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 3570 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 3571 3572 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT | 3573 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS); 3574 3575 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT | 3576 SDHCI_INT_CARD_REMOVE); 3577 result = IRQ_WAKE_THREAD; 3578 } 3579 3580 if (intmask & SDHCI_INT_CMD_MASK) 3581 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask); 3582 3583 if (intmask & SDHCI_INT_DATA_MASK) 3584 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK); 3585 3586 if (intmask & SDHCI_INT_BUS_POWER) 3587 pr_err("%s: Card is consuming too much power!\n", 3588 mmc_hostname(host->mmc)); 3589 3590 if (intmask & SDHCI_INT_RETUNE) 3591 mmc_retune_needed(host->mmc); 3592 3593 if ((intmask & SDHCI_INT_CARD_INT) && 3594 (host->ier & SDHCI_INT_CARD_INT)) { 3595 sdhci_enable_sdio_irq_nolock(host, false); 3596 sdio_signal_irq(host->mmc); 3597 } 3598 3599 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE | 3600 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | 3601 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER | 3602 SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT); 3603 3604 if (intmask) { 3605 unexpected |= intmask; 3606 sdhci_writel(host, intmask, SDHCI_INT_STATUS); 3607 } 3608 cont: 3609 if (result == IRQ_NONE) 3610 result = IRQ_HANDLED; 3611 3612 intmask = sdhci_readl(host, SDHCI_INT_STATUS); 3613 } while (intmask && --max_loops); 3614 3615 /* Determine if mrqs can be completed immediately */ 3616 for (i = 0; i < SDHCI_MAX_MRQS; i++) { 3617 struct mmc_request *mrq = host->mrqs_done[i]; 3618 3619 if (!mrq) 3620 continue; 3621 3622 if (sdhci_defer_done(host, mrq)) { 3623 result = IRQ_WAKE_THREAD; 3624 } else { 3625 mrqs_done[i] = mrq; 3626 host->mrqs_done[i] = NULL; 3627 } 3628 } 3629 out: 3630 if (host->deferred_cmd) 3631 result = IRQ_WAKE_THREAD; 3632 3633 spin_unlock(&host->lock); 3634 3635 /* Process mrqs ready for immediate completion */ 3636 for (i = 0; i < SDHCI_MAX_MRQS; i++) { 3637 if (!mrqs_done[i]) 3638 continue; 3639 3640 if (host->ops->request_done) 3641 host->ops->request_done(host, mrqs_done[i]); 3642 else 3643 mmc_request_done(host->mmc, mrqs_done[i]); 3644 } 3645 3646 if (unexpected) { 3647 pr_err("%s: Unexpected interrupt 0x%08x.\n", 3648 mmc_hostname(host->mmc), unexpected); 3649 sdhci_err_stats_inc(host, UNEXPECTED_IRQ); 3650 sdhci_dumpregs(host); 3651 } 3652 3653 return result; 3654 } 3655 3656 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id) 3657 { 3658 struct sdhci_host *host = dev_id; 3659 struct mmc_command *cmd; 3660 unsigned long flags; 3661 u32 isr; 3662 3663 while (!sdhci_request_done(host)) 3664 ; 3665 3666 spin_lock_irqsave(&host->lock, flags); 3667 3668 isr = host->thread_isr; 3669 host->thread_isr = 0; 3670 3671 cmd = host->deferred_cmd; 3672 if (cmd && !sdhci_send_command_retry(host, cmd, flags)) 3673 sdhci_finish_mrq(host, cmd->mrq); 3674 3675 spin_unlock_irqrestore(&host->lock, flags); 3676 3677 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { 3678 struct mmc_host *mmc = host->mmc; 3679 3680 mmc->ops->card_event(mmc); 3681 mmc_detect_change(mmc, msecs_to_jiffies(200)); 3682 } 3683 3684 return IRQ_HANDLED; 3685 } 3686 3687 /*****************************************************************************\ 3688 * * 3689 * Suspend/resume * 3690 * * 3691 \*****************************************************************************/ 3692 3693 #ifdef CONFIG_PM 3694 3695 static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host) 3696 { 3697 return mmc_card_is_removable(host->mmc) && 3698 !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && 3699 !mmc_can_gpio_cd(host->mmc); 3700 } 3701 3702 /* 3703 * To enable wakeup events, the corresponding events have to be enabled in 3704 * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal 3705 * Table' in the SD Host Controller Standard Specification. 3706 * It is useless to restore SDHCI_INT_ENABLE state in 3707 * sdhci_disable_irq_wakeups() since it will be set by 3708 * sdhci_enable_card_detection() or sdhci_init(). 3709 */ 3710 static bool sdhci_enable_irq_wakeups(struct sdhci_host *host) 3711 { 3712 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE | 3713 SDHCI_WAKE_ON_INT; 3714 u32 irq_val = 0; 3715 u8 wake_val = 0; 3716 u8 val; 3717 3718 if (sdhci_cd_irq_can_wakeup(host)) { 3719 wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE; 3720 irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE; 3721 } 3722 3723 if (mmc_card_wake_sdio_irq(host->mmc)) { 3724 wake_val |= SDHCI_WAKE_ON_INT; 3725 irq_val |= SDHCI_INT_CARD_INT; 3726 } 3727 3728 if (!irq_val) 3729 return false; 3730 3731 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); 3732 val &= ~mask; 3733 val |= wake_val; 3734 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); 3735 3736 sdhci_writel(host, irq_val, SDHCI_INT_ENABLE); 3737 3738 host->irq_wake_enabled = !enable_irq_wake(host->irq); 3739 3740 return host->irq_wake_enabled; 3741 } 3742 3743 static void sdhci_disable_irq_wakeups(struct sdhci_host *host) 3744 { 3745 u8 val; 3746 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE 3747 | SDHCI_WAKE_ON_INT; 3748 3749 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); 3750 val &= ~mask; 3751 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); 3752 3753 disable_irq_wake(host->irq); 3754 3755 host->irq_wake_enabled = false; 3756 } 3757 3758 int sdhci_suspend_host(struct sdhci_host *host) 3759 { 3760 sdhci_disable_card_detection(host); 3761 3762 mmc_retune_timer_stop(host->mmc); 3763 3764 if (!device_may_wakeup(mmc_dev(host->mmc)) || 3765 !sdhci_enable_irq_wakeups(host)) { 3766 host->ier = 0; 3767 sdhci_writel(host, 0, SDHCI_INT_ENABLE); 3768 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 3769 free_irq(host->irq, host); 3770 } 3771 3772 return 0; 3773 } 3774 3775 EXPORT_SYMBOL_GPL(sdhci_suspend_host); 3776 3777 int sdhci_resume_host(struct sdhci_host *host) 3778 { 3779 struct mmc_host *mmc = host->mmc; 3780 int ret = 0; 3781 3782 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 3783 if (host->ops->enable_dma) 3784 host->ops->enable_dma(host); 3785 } 3786 3787 if ((mmc->pm_flags & MMC_PM_KEEP_POWER) && 3788 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) { 3789 /* Card keeps power but host controller does not */ 3790 sdhci_init(host, 0); 3791 host->pwr = 0; 3792 host->clock = 0; 3793 host->reinit_uhs = true; 3794 mmc->ops->set_ios(mmc, &mmc->ios); 3795 } else { 3796 sdhci_init(host, (mmc->pm_flags & MMC_PM_KEEP_POWER)); 3797 } 3798 3799 if (host->irq_wake_enabled) { 3800 sdhci_disable_irq_wakeups(host); 3801 } else { 3802 ret = request_threaded_irq(host->irq, sdhci_irq, 3803 sdhci_thread_irq, IRQF_SHARED, 3804 mmc_hostname(mmc), host); 3805 if (ret) 3806 return ret; 3807 } 3808 3809 sdhci_enable_card_detection(host); 3810 3811 return ret; 3812 } 3813 3814 EXPORT_SYMBOL_GPL(sdhci_resume_host); 3815 3816 int sdhci_runtime_suspend_host(struct sdhci_host *host) 3817 { 3818 unsigned long flags; 3819 3820 mmc_retune_timer_stop(host->mmc); 3821 3822 spin_lock_irqsave(&host->lock, flags); 3823 host->ier &= SDHCI_INT_CARD_INT; 3824 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 3825 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 3826 spin_unlock_irqrestore(&host->lock, flags); 3827 3828 synchronize_hardirq(host->irq); 3829 3830 spin_lock_irqsave(&host->lock, flags); 3831 host->runtime_suspended = true; 3832 spin_unlock_irqrestore(&host->lock, flags); 3833 3834 return 0; 3835 } 3836 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host); 3837 3838 int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset) 3839 { 3840 struct mmc_host *mmc = host->mmc; 3841 unsigned long flags; 3842 int host_flags = host->flags; 3843 3844 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 3845 if (host->ops->enable_dma) 3846 host->ops->enable_dma(host); 3847 } 3848 3849 sdhci_init(host, soft_reset); 3850 3851 if (mmc->ios.power_mode != MMC_POWER_UNDEFINED && 3852 mmc->ios.power_mode != MMC_POWER_OFF) { 3853 /* Force clock and power re-program */ 3854 host->pwr = 0; 3855 host->clock = 0; 3856 host->reinit_uhs = true; 3857 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios); 3858 mmc->ops->set_ios(mmc, &mmc->ios); 3859 3860 if ((host_flags & SDHCI_PV_ENABLED) && 3861 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) { 3862 spin_lock_irqsave(&host->lock, flags); 3863 sdhci_enable_preset_value(host, true); 3864 spin_unlock_irqrestore(&host->lock, flags); 3865 } 3866 3867 if ((mmc->caps2 & MMC_CAP2_HS400_ES) && 3868 mmc->ops->hs400_enhanced_strobe) 3869 mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios); 3870 } 3871 3872 spin_lock_irqsave(&host->lock, flags); 3873 3874 host->runtime_suspended = false; 3875 3876 /* Enable SDIO IRQ */ 3877 if (sdio_irq_claimed(mmc)) 3878 sdhci_enable_sdio_irq_nolock(host, true); 3879 3880 /* Enable Card Detection */ 3881 sdhci_enable_card_detection(host); 3882 3883 spin_unlock_irqrestore(&host->lock, flags); 3884 3885 return 0; 3886 } 3887 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host); 3888 3889 #endif /* CONFIG_PM */ 3890 3891 /*****************************************************************************\ 3892 * * 3893 * Command Queue Engine (CQE) helpers * 3894 * * 3895 \*****************************************************************************/ 3896 3897 void sdhci_cqe_enable(struct mmc_host *mmc) 3898 { 3899 struct sdhci_host *host = mmc_priv(mmc); 3900 unsigned long flags; 3901 u8 ctrl; 3902 3903 spin_lock_irqsave(&host->lock, flags); 3904 3905 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 3906 ctrl &= ~SDHCI_CTRL_DMA_MASK; 3907 /* 3908 * Host from V4.10 supports ADMA3 DMA type. 3909 * ADMA3 performs integrated descriptor which is more suitable 3910 * for cmd queuing to fetch both command and transfer descriptors. 3911 */ 3912 if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3)) 3913 ctrl |= SDHCI_CTRL_ADMA3; 3914 else if (host->flags & SDHCI_USE_64_BIT_DMA) 3915 ctrl |= SDHCI_CTRL_ADMA64; 3916 else 3917 ctrl |= SDHCI_CTRL_ADMA32; 3918 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 3919 3920 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512), 3921 SDHCI_BLOCK_SIZE); 3922 3923 /* Set maximum timeout */ 3924 sdhci_set_timeout(host, NULL); 3925 3926 host->ier = host->cqe_ier; 3927 3928 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 3929 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 3930 3931 host->cqe_on = true; 3932 3933 pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n", 3934 mmc_hostname(mmc), host->ier, 3935 sdhci_readl(host, SDHCI_INT_STATUS)); 3936 3937 spin_unlock_irqrestore(&host->lock, flags); 3938 } 3939 EXPORT_SYMBOL_GPL(sdhci_cqe_enable); 3940 3941 void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery) 3942 { 3943 struct sdhci_host *host = mmc_priv(mmc); 3944 unsigned long flags; 3945 3946 spin_lock_irqsave(&host->lock, flags); 3947 3948 sdhci_set_default_irqs(host); 3949 3950 host->cqe_on = false; 3951 3952 if (recovery) 3953 sdhci_reset_for(host, CQE_RECOVERY); 3954 3955 pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n", 3956 mmc_hostname(mmc), host->ier, 3957 sdhci_readl(host, SDHCI_INT_STATUS)); 3958 3959 spin_unlock_irqrestore(&host->lock, flags); 3960 } 3961 EXPORT_SYMBOL_GPL(sdhci_cqe_disable); 3962 3963 bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error, 3964 int *data_error) 3965 { 3966 u32 mask; 3967 3968 if (!host->cqe_on) 3969 return false; 3970 3971 if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) { 3972 *cmd_error = -EILSEQ; 3973 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) 3974 sdhci_err_stats_inc(host, CMD_CRC); 3975 } else if (intmask & SDHCI_INT_TIMEOUT) { 3976 *cmd_error = -ETIMEDOUT; 3977 sdhci_err_stats_inc(host, CMD_TIMEOUT); 3978 } else 3979 *cmd_error = 0; 3980 3981 if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) { 3982 *data_error = -EILSEQ; 3983 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) 3984 sdhci_err_stats_inc(host, DAT_CRC); 3985 } else if (intmask & SDHCI_INT_DATA_TIMEOUT) { 3986 *data_error = -ETIMEDOUT; 3987 sdhci_err_stats_inc(host, DAT_TIMEOUT); 3988 } else if (intmask & SDHCI_INT_ADMA_ERROR) { 3989 *data_error = -EIO; 3990 sdhci_err_stats_inc(host, ADMA); 3991 } else 3992 *data_error = 0; 3993 3994 /* Clear selected interrupts. */ 3995 mask = intmask & host->cqe_ier; 3996 sdhci_writel(host, mask, SDHCI_INT_STATUS); 3997 3998 if (intmask & SDHCI_INT_BUS_POWER) 3999 pr_err("%s: Card is consuming too much power!\n", 4000 mmc_hostname(host->mmc)); 4001 4002 intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR); 4003 if (intmask) { 4004 sdhci_writel(host, intmask, SDHCI_INT_STATUS); 4005 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n", 4006 mmc_hostname(host->mmc), intmask); 4007 sdhci_err_stats_inc(host, UNEXPECTED_IRQ); 4008 sdhci_dumpregs(host); 4009 } 4010 4011 return true; 4012 } 4013 EXPORT_SYMBOL_GPL(sdhci_cqe_irq); 4014 4015 /*****************************************************************************\ 4016 * * 4017 * Device allocation/registration * 4018 * * 4019 \*****************************************************************************/ 4020 4021 struct sdhci_host *sdhci_alloc_host(struct device *dev, 4022 size_t priv_size) 4023 { 4024 struct mmc_host *mmc; 4025 struct sdhci_host *host; 4026 4027 WARN_ON(dev == NULL); 4028 4029 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev); 4030 if (!mmc) 4031 return ERR_PTR(-ENOMEM); 4032 4033 host = mmc_priv(mmc); 4034 host->mmc = mmc; 4035 host->mmc_host_ops = sdhci_ops; 4036 mmc->ops = &host->mmc_host_ops; 4037 4038 host->flags = SDHCI_SIGNALING_330; 4039 4040 host->cqe_ier = SDHCI_CQE_INT_MASK; 4041 host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK; 4042 4043 host->tuning_delay = -1; 4044 host->tuning_loop_count = MAX_TUNING_LOOP; 4045 4046 host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG; 4047 4048 /* 4049 * The DMA table descriptor count is calculated as the maximum 4050 * number of segments times 2, to allow for an alignment 4051 * descriptor for each segment, plus 1 for a nop end descriptor. 4052 */ 4053 host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1; 4054 host->max_adma = 65536; 4055 4056 host->max_timeout_count = 0xE; 4057 4058 return host; 4059 } 4060 4061 EXPORT_SYMBOL_GPL(sdhci_alloc_host); 4062 4063 static int sdhci_set_dma_mask(struct sdhci_host *host) 4064 { 4065 struct mmc_host *mmc = host->mmc; 4066 struct device *dev = mmc_dev(mmc); 4067 int ret = -EINVAL; 4068 4069 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) 4070 host->flags &= ~SDHCI_USE_64_BIT_DMA; 4071 4072 /* Try 64-bit mask if hardware is capable of it */ 4073 if (host->flags & SDHCI_USE_64_BIT_DMA) { 4074 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)); 4075 if (ret) { 4076 pr_warn("%s: Failed to set 64-bit DMA mask.\n", 4077 mmc_hostname(mmc)); 4078 host->flags &= ~SDHCI_USE_64_BIT_DMA; 4079 } 4080 } 4081 4082 /* 32-bit mask as default & fallback */ 4083 if (ret) { 4084 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 4085 if (ret) 4086 pr_warn("%s: Failed to set 32-bit DMA mask.\n", 4087 mmc_hostname(mmc)); 4088 } 4089 4090 return ret; 4091 } 4092 4093 void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver, 4094 const u32 *caps, const u32 *caps1) 4095 { 4096 u16 v; 4097 u64 dt_caps_mask = 0; 4098 u64 dt_caps = 0; 4099 4100 if (host->read_caps) 4101 return; 4102 4103 host->read_caps = true; 4104 4105 if (debug_quirks) 4106 host->quirks = debug_quirks; 4107 4108 if (debug_quirks2) 4109 host->quirks2 = debug_quirks2; 4110 4111 sdhci_reset_for_all(host); 4112 4113 if (host->v4_mode) 4114 sdhci_do_enable_v4_mode(host); 4115 4116 device_property_read_u64(mmc_dev(host->mmc), 4117 "sdhci-caps-mask", &dt_caps_mask); 4118 device_property_read_u64(mmc_dev(host->mmc), 4119 "sdhci-caps", &dt_caps); 4120 4121 v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION); 4122 host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT; 4123 4124 if (caps) { 4125 host->caps = *caps; 4126 } else { 4127 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); 4128 host->caps &= ~lower_32_bits(dt_caps_mask); 4129 host->caps |= lower_32_bits(dt_caps); 4130 } 4131 4132 if (host->version < SDHCI_SPEC_300) 4133 return; 4134 4135 if (caps1) { 4136 host->caps1 = *caps1; 4137 } else { 4138 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); 4139 host->caps1 &= ~upper_32_bits(dt_caps_mask); 4140 host->caps1 |= upper_32_bits(dt_caps); 4141 } 4142 } 4143 EXPORT_SYMBOL_GPL(__sdhci_read_caps); 4144 4145 static void sdhci_allocate_bounce_buffer(struct sdhci_host *host) 4146 { 4147 struct mmc_host *mmc = host->mmc; 4148 unsigned int max_blocks; 4149 unsigned int bounce_size; 4150 int ret; 4151 4152 /* 4153 * Cap the bounce buffer at 64KB. Using a bigger bounce buffer 4154 * has diminishing returns, this is probably because SD/MMC 4155 * cards are usually optimized to handle this size of requests. 4156 */ 4157 bounce_size = SZ_64K; 4158 /* 4159 * Adjust downwards to maximum request size if this is less 4160 * than our segment size, else hammer down the maximum 4161 * request size to the maximum buffer size. 4162 */ 4163 if (mmc->max_req_size < bounce_size) 4164 bounce_size = mmc->max_req_size; 4165 max_blocks = bounce_size / 512; 4166 4167 /* 4168 * When we just support one segment, we can get significant 4169 * speedups by the help of a bounce buffer to group scattered 4170 * reads/writes together. 4171 */ 4172 host->bounce_buffer = devm_kmalloc(mmc_dev(mmc), 4173 bounce_size, 4174 GFP_KERNEL); 4175 if (!host->bounce_buffer) { 4176 pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n", 4177 mmc_hostname(mmc), 4178 bounce_size); 4179 /* 4180 * Exiting with zero here makes sure we proceed with 4181 * mmc->max_segs == 1. 4182 */ 4183 return; 4184 } 4185 4186 host->bounce_addr = dma_map_single(mmc_dev(mmc), 4187 host->bounce_buffer, 4188 bounce_size, 4189 DMA_BIDIRECTIONAL); 4190 ret = dma_mapping_error(mmc_dev(mmc), host->bounce_addr); 4191 if (ret) { 4192 devm_kfree(mmc_dev(mmc), host->bounce_buffer); 4193 host->bounce_buffer = NULL; 4194 /* Again fall back to max_segs == 1 */ 4195 return; 4196 } 4197 4198 host->bounce_buffer_size = bounce_size; 4199 4200 /* Lie about this since we're bouncing */ 4201 mmc->max_segs = max_blocks; 4202 mmc->max_seg_size = bounce_size; 4203 mmc->max_req_size = bounce_size; 4204 4205 pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n", 4206 mmc_hostname(mmc), max_blocks, bounce_size); 4207 } 4208 4209 static inline bool sdhci_can_64bit_dma(struct sdhci_host *host) 4210 { 4211 /* 4212 * According to SD Host Controller spec v4.10, bit[27] added from 4213 * version 4.10 in Capabilities Register is used as 64-bit System 4214 * Address support for V4 mode. 4215 */ 4216 if (host->version >= SDHCI_SPEC_410 && host->v4_mode) 4217 return host->caps & SDHCI_CAN_64BIT_V4; 4218 4219 return host->caps & SDHCI_CAN_64BIT; 4220 } 4221 4222 int sdhci_setup_host(struct sdhci_host *host) 4223 { 4224 struct mmc_host *mmc; 4225 u32 max_current_caps; 4226 unsigned int ocr_avail; 4227 unsigned int override_timeout_clk; 4228 u32 max_clk; 4229 int ret = 0; 4230 bool enable_vqmmc = false; 4231 4232 WARN_ON(host == NULL); 4233 if (host == NULL) 4234 return -EINVAL; 4235 4236 mmc = host->mmc; 4237 4238 /* 4239 * If there are external regulators, get them. Note this must be done 4240 * early before resetting the host and reading the capabilities so that 4241 * the host can take the appropriate action if regulators are not 4242 * available. 4243 */ 4244 if (!mmc->supply.vqmmc) { 4245 ret = mmc_regulator_get_supply(mmc); 4246 if (ret) 4247 return ret; 4248 enable_vqmmc = true; 4249 } 4250 4251 DBG("Version: 0x%08x | Present: 0x%08x\n", 4252 sdhci_readw(host, SDHCI_HOST_VERSION), 4253 sdhci_readl(host, SDHCI_PRESENT_STATE)); 4254 DBG("Caps: 0x%08x | Caps_1: 0x%08x\n", 4255 sdhci_readl(host, SDHCI_CAPABILITIES), 4256 sdhci_readl(host, SDHCI_CAPABILITIES_1)); 4257 4258 sdhci_read_caps(host); 4259 4260 override_timeout_clk = host->timeout_clk; 4261 4262 if (host->version > SDHCI_SPEC_420) { 4263 pr_err("%s: Unknown controller version (%d). You may experience problems.\n", 4264 mmc_hostname(mmc), host->version); 4265 } 4266 4267 if (host->quirks & SDHCI_QUIRK_FORCE_DMA) 4268 host->flags |= SDHCI_USE_SDMA; 4269 else if (!(host->caps & SDHCI_CAN_DO_SDMA)) 4270 DBG("Controller doesn't have SDMA capability\n"); 4271 else 4272 host->flags |= SDHCI_USE_SDMA; 4273 4274 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) && 4275 (host->flags & SDHCI_USE_SDMA)) { 4276 DBG("Disabling DMA as it is marked broken\n"); 4277 host->flags &= ~SDHCI_USE_SDMA; 4278 } 4279 4280 if ((host->version >= SDHCI_SPEC_200) && 4281 (host->caps & SDHCI_CAN_DO_ADMA2)) 4282 host->flags |= SDHCI_USE_ADMA; 4283 4284 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) && 4285 (host->flags & SDHCI_USE_ADMA)) { 4286 DBG("Disabling ADMA as it is marked broken\n"); 4287 host->flags &= ~SDHCI_USE_ADMA; 4288 } 4289 4290 if (sdhci_can_64bit_dma(host)) 4291 host->flags |= SDHCI_USE_64_BIT_DMA; 4292 4293 if (host->use_external_dma) { 4294 ret = sdhci_external_dma_init(host); 4295 if (ret == -EPROBE_DEFER) 4296 goto unreg; 4297 /* 4298 * Fall back to use the DMA/PIO integrated in standard SDHCI 4299 * instead of external DMA devices. 4300 */ 4301 else if (ret) 4302 sdhci_switch_external_dma(host, false); 4303 /* Disable internal DMA sources */ 4304 else 4305 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); 4306 } 4307 4308 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 4309 if (host->ops->set_dma_mask) 4310 ret = host->ops->set_dma_mask(host); 4311 else 4312 ret = sdhci_set_dma_mask(host); 4313 4314 if (!ret && host->ops->enable_dma) 4315 ret = host->ops->enable_dma(host); 4316 4317 if (ret) { 4318 pr_warn("%s: No suitable DMA available - falling back to PIO\n", 4319 mmc_hostname(mmc)); 4320 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); 4321 4322 ret = 0; 4323 } 4324 } 4325 4326 /* SDMA does not support 64-bit DMA if v4 mode not set */ 4327 if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode) 4328 host->flags &= ~SDHCI_USE_SDMA; 4329 4330 if (host->flags & SDHCI_USE_ADMA) { 4331 dma_addr_t dma; 4332 void *buf; 4333 4334 if (!(host->flags & SDHCI_USE_64_BIT_DMA)) 4335 host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ; 4336 else if (!host->alloc_desc_sz) 4337 host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host); 4338 4339 host->desc_sz = host->alloc_desc_sz; 4340 host->adma_table_sz = host->adma_table_cnt * host->desc_sz; 4341 4342 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN; 4343 /* 4344 * Use zalloc to zero the reserved high 32-bits of 128-bit 4345 * descriptors so that they never need to be written. 4346 */ 4347 buf = dma_alloc_coherent(mmc_dev(mmc), 4348 host->align_buffer_sz + host->adma_table_sz, 4349 &dma, GFP_KERNEL); 4350 if (!buf) { 4351 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n", 4352 mmc_hostname(mmc)); 4353 host->flags &= ~SDHCI_USE_ADMA; 4354 } else if ((dma + host->align_buffer_sz) & 4355 (SDHCI_ADMA2_DESC_ALIGN - 1)) { 4356 pr_warn("%s: unable to allocate aligned ADMA descriptor\n", 4357 mmc_hostname(mmc)); 4358 host->flags &= ~SDHCI_USE_ADMA; 4359 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + 4360 host->adma_table_sz, buf, dma); 4361 } else { 4362 host->align_buffer = buf; 4363 host->align_addr = dma; 4364 4365 host->adma_table = buf + host->align_buffer_sz; 4366 host->adma_addr = dma + host->align_buffer_sz; 4367 } 4368 } 4369 4370 /* 4371 * If we use DMA, then it's up to the caller to set the DMA 4372 * mask, but PIO does not need the hw shim so we set a new 4373 * mask here in that case. 4374 */ 4375 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) { 4376 host->dma_mask = DMA_BIT_MASK(64); 4377 mmc_dev(mmc)->dma_mask = &host->dma_mask; 4378 } 4379 4380 if (host->version >= SDHCI_SPEC_300) 4381 host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps); 4382 else 4383 host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps); 4384 4385 host->max_clk *= 1000000; 4386 if (host->max_clk == 0 || host->quirks & 4387 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) { 4388 if (!host->ops->get_max_clock) { 4389 pr_err("%s: Hardware doesn't specify base clock frequency.\n", 4390 mmc_hostname(mmc)); 4391 ret = -ENODEV; 4392 goto undma; 4393 } 4394 host->max_clk = host->ops->get_max_clock(host); 4395 } 4396 4397 /* 4398 * In case of Host Controller v3.00, find out whether clock 4399 * multiplier is supported. 4400 */ 4401 host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1); 4402 4403 /* 4404 * In case the value in Clock Multiplier is 0, then programmable 4405 * clock mode is not supported, otherwise the actual clock 4406 * multiplier is one more than the value of Clock Multiplier 4407 * in the Capabilities Register. 4408 */ 4409 if (host->clk_mul) 4410 host->clk_mul += 1; 4411 4412 /* 4413 * Set host parameters. 4414 */ 4415 max_clk = host->max_clk; 4416 4417 if (host->ops->get_min_clock) 4418 mmc->f_min = host->ops->get_min_clock(host); 4419 else if (host->version >= SDHCI_SPEC_300) { 4420 if (host->clk_mul) 4421 max_clk = host->max_clk * host->clk_mul; 4422 /* 4423 * Divided Clock Mode minimum clock rate is always less than 4424 * Programmable Clock Mode minimum clock rate. 4425 */ 4426 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300; 4427 } else 4428 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200; 4429 4430 if (!mmc->f_max || mmc->f_max > max_clk) 4431 mmc->f_max = max_clk; 4432 4433 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) { 4434 host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps); 4435 4436 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT) 4437 host->timeout_clk *= 1000; 4438 4439 if (host->timeout_clk == 0) { 4440 if (!host->ops->get_timeout_clock) { 4441 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n", 4442 mmc_hostname(mmc)); 4443 ret = -ENODEV; 4444 goto undma; 4445 } 4446 4447 host->timeout_clk = 4448 DIV_ROUND_UP(host->ops->get_timeout_clock(host), 4449 1000); 4450 } 4451 4452 if (override_timeout_clk) 4453 host->timeout_clk = override_timeout_clk; 4454 4455 mmc->max_busy_timeout = host->ops->get_max_timeout_count ? 4456 host->ops->get_max_timeout_count(host) : 1 << 27; 4457 mmc->max_busy_timeout /= host->timeout_clk; 4458 } 4459 4460 if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT && 4461 !host->ops->get_max_timeout_count) 4462 mmc->max_busy_timeout = 0; 4463 4464 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23; 4465 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD; 4466 4467 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) 4468 host->flags |= SDHCI_AUTO_CMD12; 4469 4470 /* 4471 * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO. 4472 * For v4 mode, SDMA may use Auto-CMD23 as well. 4473 */ 4474 if ((host->version >= SDHCI_SPEC_300) && 4475 ((host->flags & SDHCI_USE_ADMA) || 4476 !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) && 4477 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) { 4478 host->flags |= SDHCI_AUTO_CMD23; 4479 DBG("Auto-CMD23 available\n"); 4480 } else { 4481 DBG("Auto-CMD23 unavailable\n"); 4482 } 4483 4484 /* 4485 * A controller may support 8-bit width, but the board itself 4486 * might not have the pins brought out. Boards that support 4487 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in 4488 * their platform code before calling sdhci_add_host(), and we 4489 * won't assume 8-bit width for hosts without that CAP. 4490 */ 4491 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) 4492 mmc->caps |= MMC_CAP_4_BIT_DATA; 4493 4494 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23) 4495 mmc->caps &= ~MMC_CAP_CMD23; 4496 4497 if (host->caps & SDHCI_CAN_DO_HISPD) 4498 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; 4499 4500 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && 4501 mmc_card_is_removable(mmc) && 4502 mmc_gpio_get_cd(mmc) < 0) 4503 mmc->caps |= MMC_CAP_NEEDS_POLL; 4504 4505 if (!IS_ERR(mmc->supply.vqmmc)) { 4506 if (enable_vqmmc) { 4507 ret = regulator_enable(mmc->supply.vqmmc); 4508 host->sdhci_core_to_disable_vqmmc = !ret; 4509 } 4510 4511 /* If vqmmc provides no 1.8V signalling, then there's no UHS */ 4512 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000, 4513 1950000)) 4514 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | 4515 SDHCI_SUPPORT_SDR50 | 4516 SDHCI_SUPPORT_DDR50); 4517 4518 /* In eMMC case vqmmc might be a fixed 1.8V regulator */ 4519 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000, 4520 3600000)) 4521 host->flags &= ~SDHCI_SIGNALING_330; 4522 4523 if (ret) { 4524 pr_warn("%s: Failed to enable vqmmc regulator: %d\n", 4525 mmc_hostname(mmc), ret); 4526 mmc->supply.vqmmc = ERR_PTR(-EINVAL); 4527 } 4528 4529 } 4530 4531 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) { 4532 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | 4533 SDHCI_SUPPORT_DDR50); 4534 /* 4535 * The SDHCI controller in a SoC might support HS200/HS400 4536 * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property), 4537 * but if the board is modeled such that the IO lines are not 4538 * connected to 1.8v then HS200/HS400 cannot be supported. 4539 * Disable HS200/HS400 if the board does not have 1.8v connected 4540 * to the IO lines. (Applicable for other modes in 1.8v) 4541 */ 4542 mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES); 4543 mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS); 4544 } 4545 4546 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */ 4547 if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | 4548 SDHCI_SUPPORT_DDR50)) 4549 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25; 4550 4551 /* SDR104 supports also implies SDR50 support */ 4552 if (host->caps1 & SDHCI_SUPPORT_SDR104) { 4553 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50; 4554 /* SD3.0: SDR104 is supported so (for eMMC) the caps2 4555 * field can be promoted to support HS200. 4556 */ 4557 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200)) 4558 mmc->caps2 |= MMC_CAP2_HS200; 4559 } else if (host->caps1 & SDHCI_SUPPORT_SDR50) { 4560 mmc->caps |= MMC_CAP_UHS_SDR50; 4561 } 4562 4563 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 && 4564 (host->caps1 & SDHCI_SUPPORT_HS400)) 4565 mmc->caps2 |= MMC_CAP2_HS400; 4566 4567 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) && 4568 (IS_ERR(mmc->supply.vqmmc) || 4569 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000, 4570 1300000))) 4571 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V; 4572 4573 if ((host->caps1 & SDHCI_SUPPORT_DDR50) && 4574 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50)) 4575 mmc->caps |= MMC_CAP_UHS_DDR50; 4576 4577 /* Does the host need tuning for SDR50? */ 4578 if (host->caps1 & SDHCI_USE_SDR50_TUNING) 4579 host->flags |= SDHCI_SDR50_NEEDS_TUNING; 4580 4581 /* Driver Type(s) (A, C, D) supported by the host */ 4582 if (host->caps1 & SDHCI_DRIVER_TYPE_A) 4583 mmc->caps |= MMC_CAP_DRIVER_TYPE_A; 4584 if (host->caps1 & SDHCI_DRIVER_TYPE_C) 4585 mmc->caps |= MMC_CAP_DRIVER_TYPE_C; 4586 if (host->caps1 & SDHCI_DRIVER_TYPE_D) 4587 mmc->caps |= MMC_CAP_DRIVER_TYPE_D; 4588 4589 /* Initial value for re-tuning timer count */ 4590 host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK, 4591 host->caps1); 4592 4593 /* 4594 * In case Re-tuning Timer is not disabled, the actual value of 4595 * re-tuning timer will be 2 ^ (n - 1). 4596 */ 4597 if (host->tuning_count) 4598 host->tuning_count = 1 << (host->tuning_count - 1); 4599 4600 /* Re-tuning mode supported by the Host Controller */ 4601 host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1); 4602 4603 ocr_avail = 0; 4604 4605 /* 4606 * According to SD Host Controller spec v3.00, if the Host System 4607 * can afford more than 150mA, Host Driver should set XPC to 1. Also 4608 * the value is meaningful only if Voltage Support in the Capabilities 4609 * register is set. The actual current value is 4 times the register 4610 * value. 4611 */ 4612 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT); 4613 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) { 4614 int curr = regulator_get_current_limit(mmc->supply.vmmc); 4615 if (curr > 0) { 4616 4617 /* convert to SDHCI_MAX_CURRENT format */ 4618 curr = curr/1000; /* convert to mA */ 4619 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER; 4620 4621 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT); 4622 max_current_caps = 4623 FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, curr) | 4624 FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, curr) | 4625 FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, curr); 4626 } 4627 } 4628 4629 if (host->caps & SDHCI_CAN_VDD_330) { 4630 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34; 4631 4632 mmc->max_current_330 = FIELD_GET(SDHCI_MAX_CURRENT_330_MASK, 4633 max_current_caps) * 4634 SDHCI_MAX_CURRENT_MULTIPLIER; 4635 } 4636 if (host->caps & SDHCI_CAN_VDD_300) { 4637 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31; 4638 4639 mmc->max_current_300 = FIELD_GET(SDHCI_MAX_CURRENT_300_MASK, 4640 max_current_caps) * 4641 SDHCI_MAX_CURRENT_MULTIPLIER; 4642 } 4643 if (host->caps & SDHCI_CAN_VDD_180) { 4644 ocr_avail |= MMC_VDD_165_195; 4645 4646 mmc->max_current_180 = FIELD_GET(SDHCI_MAX_CURRENT_180_MASK, 4647 max_current_caps) * 4648 SDHCI_MAX_CURRENT_MULTIPLIER; 4649 } 4650 4651 /* If OCR set by host, use it instead. */ 4652 if (host->ocr_mask) 4653 ocr_avail = host->ocr_mask; 4654 4655 /* If OCR set by external regulators, give it highest prio. */ 4656 if (mmc->ocr_avail) 4657 ocr_avail = mmc->ocr_avail; 4658 4659 mmc->ocr_avail = ocr_avail; 4660 mmc->ocr_avail_sdio = ocr_avail; 4661 if (host->ocr_avail_sdio) 4662 mmc->ocr_avail_sdio &= host->ocr_avail_sdio; 4663 mmc->ocr_avail_sd = ocr_avail; 4664 if (host->ocr_avail_sd) 4665 mmc->ocr_avail_sd &= host->ocr_avail_sd; 4666 else /* normal SD controllers don't support 1.8V */ 4667 mmc->ocr_avail_sd &= ~MMC_VDD_165_195; 4668 mmc->ocr_avail_mmc = ocr_avail; 4669 if (host->ocr_avail_mmc) 4670 mmc->ocr_avail_mmc &= host->ocr_avail_mmc; 4671 4672 if (mmc->ocr_avail == 0) { 4673 pr_err("%s: Hardware doesn't report any support voltages.\n", 4674 mmc_hostname(mmc)); 4675 ret = -ENODEV; 4676 goto unreg; 4677 } 4678 4679 if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 4680 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | 4681 MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) || 4682 (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V))) 4683 host->flags |= SDHCI_SIGNALING_180; 4684 4685 if (mmc->caps2 & MMC_CAP2_HSX00_1_2V) 4686 host->flags |= SDHCI_SIGNALING_120; 4687 4688 spin_lock_init(&host->lock); 4689 4690 /* 4691 * Maximum number of sectors in one transfer. Limited by SDMA boundary 4692 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this 4693 * is less anyway. 4694 */ 4695 mmc->max_req_size = 524288; 4696 4697 /* 4698 * Maximum number of segments. Depends on if the hardware 4699 * can do scatter/gather or not. 4700 */ 4701 if (host->flags & SDHCI_USE_ADMA) { 4702 mmc->max_segs = SDHCI_MAX_SEGS; 4703 } else if (host->flags & SDHCI_USE_SDMA) { 4704 mmc->max_segs = 1; 4705 mmc->max_req_size = min_t(size_t, mmc->max_req_size, 4706 dma_max_mapping_size(mmc_dev(mmc))); 4707 } else { /* PIO */ 4708 mmc->max_segs = SDHCI_MAX_SEGS; 4709 } 4710 4711 /* 4712 * Maximum segment size. Could be one segment with the maximum number 4713 * of bytes. When doing hardware scatter/gather, each entry cannot 4714 * be larger than 64 KiB though. 4715 */ 4716 if (host->flags & SDHCI_USE_ADMA) { 4717 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC) { 4718 host->max_adma = 65532; /* 32-bit alignment */ 4719 mmc->max_seg_size = 65535; 4720 } else { 4721 mmc->max_seg_size = 65536; 4722 } 4723 } else { 4724 mmc->max_seg_size = mmc->max_req_size; 4725 } 4726 4727 /* 4728 * Maximum block size. This varies from controller to controller and 4729 * is specified in the capabilities register. 4730 */ 4731 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) { 4732 mmc->max_blk_size = 2; 4733 } else { 4734 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >> 4735 SDHCI_MAX_BLOCK_SHIFT; 4736 if (mmc->max_blk_size >= 3) { 4737 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n", 4738 mmc_hostname(mmc)); 4739 mmc->max_blk_size = 0; 4740 } 4741 } 4742 4743 mmc->max_blk_size = 512 << mmc->max_blk_size; 4744 4745 /* 4746 * Maximum block count. 4747 */ 4748 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535; 4749 4750 if (mmc->max_segs == 1) 4751 /* This may alter mmc->*_blk_* parameters */ 4752 sdhci_allocate_bounce_buffer(host); 4753 4754 return 0; 4755 4756 unreg: 4757 if (host->sdhci_core_to_disable_vqmmc) 4758 regulator_disable(mmc->supply.vqmmc); 4759 undma: 4760 if (host->align_buffer) 4761 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + 4762 host->adma_table_sz, host->align_buffer, 4763 host->align_addr); 4764 host->adma_table = NULL; 4765 host->align_buffer = NULL; 4766 4767 return ret; 4768 } 4769 EXPORT_SYMBOL_GPL(sdhci_setup_host); 4770 4771 void sdhci_cleanup_host(struct sdhci_host *host) 4772 { 4773 struct mmc_host *mmc = host->mmc; 4774 4775 if (host->sdhci_core_to_disable_vqmmc) 4776 regulator_disable(mmc->supply.vqmmc); 4777 4778 if (host->align_buffer) 4779 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + 4780 host->adma_table_sz, host->align_buffer, 4781 host->align_addr); 4782 4783 if (host->use_external_dma) 4784 sdhci_external_dma_release(host); 4785 4786 host->adma_table = NULL; 4787 host->align_buffer = NULL; 4788 } 4789 EXPORT_SYMBOL_GPL(sdhci_cleanup_host); 4790 4791 int __sdhci_add_host(struct sdhci_host *host) 4792 { 4793 unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI; 4794 struct mmc_host *mmc = host->mmc; 4795 int ret; 4796 4797 if ((mmc->caps2 & MMC_CAP2_CQE) && 4798 (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) { 4799 mmc->caps2 &= ~MMC_CAP2_CQE; 4800 mmc->cqe_ops = NULL; 4801 } 4802 4803 host->complete_wq = alloc_workqueue("sdhci", flags, 0); 4804 if (!host->complete_wq) 4805 return -ENOMEM; 4806 4807 INIT_WORK(&host->complete_work, sdhci_complete_work); 4808 4809 timer_setup(&host->timer, sdhci_timeout_timer, 0); 4810 timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0); 4811 4812 init_waitqueue_head(&host->buf_ready_int); 4813 4814 sdhci_init(host, 0); 4815 4816 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq, 4817 IRQF_SHARED, mmc_hostname(mmc), host); 4818 if (ret) { 4819 pr_err("%s: Failed to request IRQ %d: %d\n", 4820 mmc_hostname(mmc), host->irq, ret); 4821 goto unwq; 4822 } 4823 4824 ret = sdhci_led_register(host); 4825 if (ret) { 4826 pr_err("%s: Failed to register LED device: %d\n", 4827 mmc_hostname(mmc), ret); 4828 goto unirq; 4829 } 4830 4831 ret = mmc_add_host(mmc); 4832 if (ret) 4833 goto unled; 4834 4835 pr_info("%s: SDHCI controller on %s [%s] using %s\n", 4836 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)), 4837 host->use_external_dma ? "External DMA" : 4838 (host->flags & SDHCI_USE_ADMA) ? 4839 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" : 4840 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO"); 4841 4842 sdhci_enable_card_detection(host); 4843 4844 return 0; 4845 4846 unled: 4847 sdhci_led_unregister(host); 4848 unirq: 4849 sdhci_reset_for_all(host); 4850 sdhci_writel(host, 0, SDHCI_INT_ENABLE); 4851 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 4852 free_irq(host->irq, host); 4853 unwq: 4854 destroy_workqueue(host->complete_wq); 4855 4856 return ret; 4857 } 4858 EXPORT_SYMBOL_GPL(__sdhci_add_host); 4859 4860 int sdhci_add_host(struct sdhci_host *host) 4861 { 4862 int ret; 4863 4864 ret = sdhci_setup_host(host); 4865 if (ret) 4866 return ret; 4867 4868 ret = __sdhci_add_host(host); 4869 if (ret) 4870 goto cleanup; 4871 4872 return 0; 4873 4874 cleanup: 4875 sdhci_cleanup_host(host); 4876 4877 return ret; 4878 } 4879 EXPORT_SYMBOL_GPL(sdhci_add_host); 4880 4881 void sdhci_remove_host(struct sdhci_host *host, int dead) 4882 { 4883 struct mmc_host *mmc = host->mmc; 4884 unsigned long flags; 4885 4886 if (dead) { 4887 spin_lock_irqsave(&host->lock, flags); 4888 4889 host->flags |= SDHCI_DEVICE_DEAD; 4890 4891 if (sdhci_has_requests(host)) { 4892 pr_err("%s: Controller removed during " 4893 " transfer!\n", mmc_hostname(mmc)); 4894 sdhci_error_out_mrqs(host, -ENOMEDIUM); 4895 } 4896 4897 spin_unlock_irqrestore(&host->lock, flags); 4898 } 4899 4900 sdhci_disable_card_detection(host); 4901 4902 mmc_remove_host(mmc); 4903 4904 sdhci_led_unregister(host); 4905 4906 if (!dead) 4907 sdhci_reset_for_all(host); 4908 4909 sdhci_writel(host, 0, SDHCI_INT_ENABLE); 4910 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 4911 free_irq(host->irq, host); 4912 4913 del_timer_sync(&host->timer); 4914 del_timer_sync(&host->data_timer); 4915 4916 destroy_workqueue(host->complete_wq); 4917 4918 if (host->sdhci_core_to_disable_vqmmc) 4919 regulator_disable(mmc->supply.vqmmc); 4920 4921 if (host->align_buffer) 4922 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + 4923 host->adma_table_sz, host->align_buffer, 4924 host->align_addr); 4925 4926 if (host->use_external_dma) 4927 sdhci_external_dma_release(host); 4928 4929 host->adma_table = NULL; 4930 host->align_buffer = NULL; 4931 } 4932 4933 EXPORT_SYMBOL_GPL(sdhci_remove_host); 4934 4935 void sdhci_free_host(struct sdhci_host *host) 4936 { 4937 mmc_free_host(host->mmc); 4938 } 4939 4940 EXPORT_SYMBOL_GPL(sdhci_free_host); 4941 4942 /*****************************************************************************\ 4943 * * 4944 * Driver init/exit * 4945 * * 4946 \*****************************************************************************/ 4947 4948 static int __init sdhci_drv_init(void) 4949 { 4950 pr_info(DRIVER_NAME 4951 ": Secure Digital Host Controller Interface driver\n"); 4952 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 4953 4954 return 0; 4955 } 4956 4957 static void __exit sdhci_drv_exit(void) 4958 { 4959 } 4960 4961 module_init(sdhci_drv_init); 4962 module_exit(sdhci_drv_exit); 4963 4964 module_param(debug_quirks, uint, 0444); 4965 module_param(debug_quirks2, uint, 0444); 4966 4967 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 4968 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver"); 4969 MODULE_LICENSE("GPL"); 4970 4971 MODULE_PARM_DESC(debug_quirks, "Force certain quirks."); 4972 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks."); 4973