1 /* 2 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver 3 * 4 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or (at 9 * your option) any later version. 10 * 11 * Thanks to the following companies for their support: 12 * 13 * - JMicron (hardware and technical support) 14 */ 15 16 #include <linux/delay.h> 17 #include <linux/highmem.h> 18 #include <linux/io.h> 19 #include <linux/module.h> 20 #include <linux/dma-mapping.h> 21 #include <linux/slab.h> 22 #include <linux/scatterlist.h> 23 #include <linux/regulator/consumer.h> 24 #include <linux/pm_runtime.h> 25 26 #include <linux/leds.h> 27 28 #include <linux/mmc/mmc.h> 29 #include <linux/mmc/host.h> 30 #include <linux/mmc/card.h> 31 #include <linux/mmc/sdio.h> 32 #include <linux/mmc/slot-gpio.h> 33 34 #include "sdhci.h" 35 36 #define DRIVER_NAME "sdhci" 37 38 #define DBG(f, x...) \ 39 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x) 40 41 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \ 42 defined(CONFIG_MMC_SDHCI_MODULE)) 43 #define SDHCI_USE_LEDS_CLASS 44 #endif 45 46 #define MAX_TUNING_LOOP 40 47 48 static unsigned int debug_quirks = 0; 49 static unsigned int debug_quirks2; 50 51 static void sdhci_finish_data(struct sdhci_host *); 52 53 static void sdhci_finish_command(struct sdhci_host *); 54 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode); 55 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable); 56 static int sdhci_pre_dma_transfer(struct sdhci_host *host, 57 struct mmc_data *data); 58 static int sdhci_do_get_cd(struct sdhci_host *host); 59 60 #ifdef CONFIG_PM 61 static int sdhci_runtime_pm_get(struct sdhci_host *host); 62 static int sdhci_runtime_pm_put(struct sdhci_host *host); 63 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host); 64 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host); 65 #else 66 static inline int sdhci_runtime_pm_get(struct sdhci_host *host) 67 { 68 return 0; 69 } 70 static inline int sdhci_runtime_pm_put(struct sdhci_host *host) 71 { 72 return 0; 73 } 74 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) 75 { 76 } 77 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) 78 { 79 } 80 #endif 81 82 static void sdhci_dumpregs(struct sdhci_host *host) 83 { 84 pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n", 85 mmc_hostname(host->mmc)); 86 87 pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n", 88 sdhci_readl(host, SDHCI_DMA_ADDRESS), 89 sdhci_readw(host, SDHCI_HOST_VERSION)); 90 pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n", 91 sdhci_readw(host, SDHCI_BLOCK_SIZE), 92 sdhci_readw(host, SDHCI_BLOCK_COUNT)); 93 pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n", 94 sdhci_readl(host, SDHCI_ARGUMENT), 95 sdhci_readw(host, SDHCI_TRANSFER_MODE)); 96 pr_debug(DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n", 97 sdhci_readl(host, SDHCI_PRESENT_STATE), 98 sdhci_readb(host, SDHCI_HOST_CONTROL)); 99 pr_debug(DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n", 100 sdhci_readb(host, SDHCI_POWER_CONTROL), 101 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL)); 102 pr_debug(DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n", 103 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL), 104 sdhci_readw(host, SDHCI_CLOCK_CONTROL)); 105 pr_debug(DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n", 106 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL), 107 sdhci_readl(host, SDHCI_INT_STATUS)); 108 pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n", 109 sdhci_readl(host, SDHCI_INT_ENABLE), 110 sdhci_readl(host, SDHCI_SIGNAL_ENABLE)); 111 pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n", 112 sdhci_readw(host, SDHCI_ACMD12_ERR), 113 sdhci_readw(host, SDHCI_SLOT_INT_STATUS)); 114 pr_debug(DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n", 115 sdhci_readl(host, SDHCI_CAPABILITIES), 116 sdhci_readl(host, SDHCI_CAPABILITIES_1)); 117 pr_debug(DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n", 118 sdhci_readw(host, SDHCI_COMMAND), 119 sdhci_readl(host, SDHCI_MAX_CURRENT)); 120 pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n", 121 sdhci_readw(host, SDHCI_HOST_CONTROL2)); 122 123 if (host->flags & SDHCI_USE_ADMA) { 124 if (host->flags & SDHCI_USE_64_BIT_DMA) 125 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n", 126 readl(host->ioaddr + SDHCI_ADMA_ERROR), 127 readl(host->ioaddr + SDHCI_ADMA_ADDRESS_HI), 128 readl(host->ioaddr + SDHCI_ADMA_ADDRESS)); 129 else 130 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n", 131 readl(host->ioaddr + SDHCI_ADMA_ERROR), 132 readl(host->ioaddr + SDHCI_ADMA_ADDRESS)); 133 } 134 135 pr_debug(DRIVER_NAME ": ===========================================\n"); 136 } 137 138 /*****************************************************************************\ 139 * * 140 * Low level functions * 141 * * 142 \*****************************************************************************/ 143 144 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable) 145 { 146 u32 present; 147 148 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) || 149 (host->mmc->caps & MMC_CAP_NONREMOVABLE)) 150 return; 151 152 if (enable) { 153 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 154 SDHCI_CARD_PRESENT; 155 156 host->ier |= present ? SDHCI_INT_CARD_REMOVE : 157 SDHCI_INT_CARD_INSERT; 158 } else { 159 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT); 160 } 161 162 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 163 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 164 } 165 166 static void sdhci_enable_card_detection(struct sdhci_host *host) 167 { 168 sdhci_set_card_detection(host, true); 169 } 170 171 static void sdhci_disable_card_detection(struct sdhci_host *host) 172 { 173 sdhci_set_card_detection(host, false); 174 } 175 176 void sdhci_reset(struct sdhci_host *host, u8 mask) 177 { 178 unsigned long timeout; 179 180 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET); 181 182 if (mask & SDHCI_RESET_ALL) { 183 host->clock = 0; 184 /* Reset-all turns off SD Bus Power */ 185 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 186 sdhci_runtime_pm_bus_off(host); 187 } 188 189 /* Wait max 100 ms */ 190 timeout = 100; 191 192 /* hw clears the bit when it's done */ 193 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) { 194 if (timeout == 0) { 195 pr_err("%s: Reset 0x%x never completed.\n", 196 mmc_hostname(host->mmc), (int)mask); 197 sdhci_dumpregs(host); 198 return; 199 } 200 timeout--; 201 mdelay(1); 202 } 203 } 204 EXPORT_SYMBOL_GPL(sdhci_reset); 205 206 static void sdhci_do_reset(struct sdhci_host *host, u8 mask) 207 { 208 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) { 209 if (!sdhci_do_get_cd(host)) 210 return; 211 } 212 213 host->ops->reset(host, mask); 214 215 if (mask & SDHCI_RESET_ALL) { 216 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 217 if (host->ops->enable_dma) 218 host->ops->enable_dma(host); 219 } 220 221 /* Resetting the controller clears many */ 222 host->preset_enabled = false; 223 } 224 } 225 226 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); 227 228 static void sdhci_init(struct sdhci_host *host, int soft) 229 { 230 if (soft) 231 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA); 232 else 233 sdhci_do_reset(host, SDHCI_RESET_ALL); 234 235 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT | 236 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | 237 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC | 238 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END | 239 SDHCI_INT_RESPONSE; 240 241 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 242 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 243 244 if (soft) { 245 /* force clock reconfiguration */ 246 host->clock = 0; 247 sdhci_set_ios(host->mmc, &host->mmc->ios); 248 } 249 } 250 251 static void sdhci_reinit(struct sdhci_host *host) 252 { 253 sdhci_init(host, 0); 254 sdhci_enable_card_detection(host); 255 } 256 257 static void sdhci_activate_led(struct sdhci_host *host) 258 { 259 u8 ctrl; 260 261 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 262 ctrl |= SDHCI_CTRL_LED; 263 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 264 } 265 266 static void sdhci_deactivate_led(struct sdhci_host *host) 267 { 268 u8 ctrl; 269 270 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 271 ctrl &= ~SDHCI_CTRL_LED; 272 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 273 } 274 275 #ifdef SDHCI_USE_LEDS_CLASS 276 static void sdhci_led_control(struct led_classdev *led, 277 enum led_brightness brightness) 278 { 279 struct sdhci_host *host = container_of(led, struct sdhci_host, led); 280 unsigned long flags; 281 282 spin_lock_irqsave(&host->lock, flags); 283 284 if (host->runtime_suspended) 285 goto out; 286 287 if (brightness == LED_OFF) 288 sdhci_deactivate_led(host); 289 else 290 sdhci_activate_led(host); 291 out: 292 spin_unlock_irqrestore(&host->lock, flags); 293 } 294 #endif 295 296 /*****************************************************************************\ 297 * * 298 * Core functions * 299 * * 300 \*****************************************************************************/ 301 302 static void sdhci_read_block_pio(struct sdhci_host *host) 303 { 304 unsigned long flags; 305 size_t blksize, len, chunk; 306 u32 uninitialized_var(scratch); 307 u8 *buf; 308 309 DBG("PIO reading\n"); 310 311 blksize = host->data->blksz; 312 chunk = 0; 313 314 local_irq_save(flags); 315 316 while (blksize) { 317 BUG_ON(!sg_miter_next(&host->sg_miter)); 318 319 len = min(host->sg_miter.length, blksize); 320 321 blksize -= len; 322 host->sg_miter.consumed = len; 323 324 buf = host->sg_miter.addr; 325 326 while (len) { 327 if (chunk == 0) { 328 scratch = sdhci_readl(host, SDHCI_BUFFER); 329 chunk = 4; 330 } 331 332 *buf = scratch & 0xFF; 333 334 buf++; 335 scratch >>= 8; 336 chunk--; 337 len--; 338 } 339 } 340 341 sg_miter_stop(&host->sg_miter); 342 343 local_irq_restore(flags); 344 } 345 346 static void sdhci_write_block_pio(struct sdhci_host *host) 347 { 348 unsigned long flags; 349 size_t blksize, len, chunk; 350 u32 scratch; 351 u8 *buf; 352 353 DBG("PIO writing\n"); 354 355 blksize = host->data->blksz; 356 chunk = 0; 357 scratch = 0; 358 359 local_irq_save(flags); 360 361 while (blksize) { 362 BUG_ON(!sg_miter_next(&host->sg_miter)); 363 364 len = min(host->sg_miter.length, blksize); 365 366 blksize -= len; 367 host->sg_miter.consumed = len; 368 369 buf = host->sg_miter.addr; 370 371 while (len) { 372 scratch |= (u32)*buf << (chunk * 8); 373 374 buf++; 375 chunk++; 376 len--; 377 378 if ((chunk == 4) || ((len == 0) && (blksize == 0))) { 379 sdhci_writel(host, scratch, SDHCI_BUFFER); 380 chunk = 0; 381 scratch = 0; 382 } 383 } 384 } 385 386 sg_miter_stop(&host->sg_miter); 387 388 local_irq_restore(flags); 389 } 390 391 static void sdhci_transfer_pio(struct sdhci_host *host) 392 { 393 u32 mask; 394 395 BUG_ON(!host->data); 396 397 if (host->blocks == 0) 398 return; 399 400 if (host->data->flags & MMC_DATA_READ) 401 mask = SDHCI_DATA_AVAILABLE; 402 else 403 mask = SDHCI_SPACE_AVAILABLE; 404 405 /* 406 * Some controllers (JMicron JMB38x) mess up the buffer bits 407 * for transfers < 4 bytes. As long as it is just one block, 408 * we can ignore the bits. 409 */ 410 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) && 411 (host->data->blocks == 1)) 412 mask = ~0; 413 414 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { 415 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY) 416 udelay(100); 417 418 if (host->data->flags & MMC_DATA_READ) 419 sdhci_read_block_pio(host); 420 else 421 sdhci_write_block_pio(host); 422 423 host->blocks--; 424 if (host->blocks == 0) 425 break; 426 } 427 428 DBG("PIO transfer complete.\n"); 429 } 430 431 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags) 432 { 433 local_irq_save(*flags); 434 return kmap_atomic(sg_page(sg)) + sg->offset; 435 } 436 437 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags) 438 { 439 kunmap_atomic(buffer); 440 local_irq_restore(*flags); 441 } 442 443 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc, 444 dma_addr_t addr, int len, unsigned cmd) 445 { 446 struct sdhci_adma2_64_desc *dma_desc = desc; 447 448 /* 32-bit and 64-bit descriptors have these members in same position */ 449 dma_desc->cmd = cpu_to_le16(cmd); 450 dma_desc->len = cpu_to_le16(len); 451 dma_desc->addr_lo = cpu_to_le32((u32)addr); 452 453 if (host->flags & SDHCI_USE_64_BIT_DMA) 454 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32); 455 } 456 457 static void sdhci_adma_mark_end(void *desc) 458 { 459 struct sdhci_adma2_64_desc *dma_desc = desc; 460 461 /* 32-bit and 64-bit descriptors have 'cmd' in same position */ 462 dma_desc->cmd |= cpu_to_le16(ADMA2_END); 463 } 464 465 static int sdhci_adma_table_pre(struct sdhci_host *host, 466 struct mmc_data *data) 467 { 468 int direction; 469 470 void *desc; 471 void *align; 472 dma_addr_t addr; 473 dma_addr_t align_addr; 474 int len, offset; 475 476 struct scatterlist *sg; 477 int i; 478 char *buffer; 479 unsigned long flags; 480 481 /* 482 * The spec does not specify endianness of descriptor table. 483 * We currently guess that it is LE. 484 */ 485 486 if (data->flags & MMC_DATA_READ) 487 direction = DMA_FROM_DEVICE; 488 else 489 direction = DMA_TO_DEVICE; 490 491 host->align_addr = dma_map_single(mmc_dev(host->mmc), 492 host->align_buffer, host->align_buffer_sz, direction); 493 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr)) 494 goto fail; 495 BUG_ON(host->align_addr & SDHCI_ADMA2_MASK); 496 497 host->sg_count = sdhci_pre_dma_transfer(host, data); 498 if (host->sg_count < 0) 499 goto unmap_align; 500 501 desc = host->adma_table; 502 align = host->align_buffer; 503 504 align_addr = host->align_addr; 505 506 for_each_sg(data->sg, sg, host->sg_count, i) { 507 addr = sg_dma_address(sg); 508 len = sg_dma_len(sg); 509 510 /* 511 * The SDHCI specification states that ADMA 512 * addresses must be 32-bit aligned. If they 513 * aren't, then we use a bounce buffer for 514 * the (up to three) bytes that screw up the 515 * alignment. 516 */ 517 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) & 518 SDHCI_ADMA2_MASK; 519 if (offset) { 520 if (data->flags & MMC_DATA_WRITE) { 521 buffer = sdhci_kmap_atomic(sg, &flags); 522 memcpy(align, buffer, offset); 523 sdhci_kunmap_atomic(buffer, &flags); 524 } 525 526 /* tran, valid */ 527 sdhci_adma_write_desc(host, desc, align_addr, offset, 528 ADMA2_TRAN_VALID); 529 530 BUG_ON(offset > 65536); 531 532 align += SDHCI_ADMA2_ALIGN; 533 align_addr += SDHCI_ADMA2_ALIGN; 534 535 desc += host->desc_sz; 536 537 addr += offset; 538 len -= offset; 539 } 540 541 BUG_ON(len > 65536); 542 543 if (len) { 544 /* tran, valid */ 545 sdhci_adma_write_desc(host, desc, addr, len, 546 ADMA2_TRAN_VALID); 547 desc += host->desc_sz; 548 } 549 550 /* 551 * If this triggers then we have a calculation bug 552 * somewhere. :/ 553 */ 554 WARN_ON((desc - host->adma_table) >= host->adma_table_sz); 555 } 556 557 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) { 558 /* 559 * Mark the last descriptor as the terminating descriptor 560 */ 561 if (desc != host->adma_table) { 562 desc -= host->desc_sz; 563 sdhci_adma_mark_end(desc); 564 } 565 } else { 566 /* 567 * Add a terminating entry. 568 */ 569 570 /* nop, end, valid */ 571 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID); 572 } 573 574 /* 575 * Resync align buffer as we might have changed it. 576 */ 577 if (data->flags & MMC_DATA_WRITE) { 578 dma_sync_single_for_device(mmc_dev(host->mmc), 579 host->align_addr, host->align_buffer_sz, direction); 580 } 581 582 return 0; 583 584 unmap_align: 585 dma_unmap_single(mmc_dev(host->mmc), host->align_addr, 586 host->align_buffer_sz, direction); 587 fail: 588 return -EINVAL; 589 } 590 591 static void sdhci_adma_table_post(struct sdhci_host *host, 592 struct mmc_data *data) 593 { 594 int direction; 595 596 struct scatterlist *sg; 597 int i, size; 598 void *align; 599 char *buffer; 600 unsigned long flags; 601 bool has_unaligned; 602 603 if (data->flags & MMC_DATA_READ) 604 direction = DMA_FROM_DEVICE; 605 else 606 direction = DMA_TO_DEVICE; 607 608 dma_unmap_single(mmc_dev(host->mmc), host->align_addr, 609 host->align_buffer_sz, direction); 610 611 /* Do a quick scan of the SG list for any unaligned mappings */ 612 has_unaligned = false; 613 for_each_sg(data->sg, sg, host->sg_count, i) 614 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) { 615 has_unaligned = true; 616 break; 617 } 618 619 if (has_unaligned && data->flags & MMC_DATA_READ) { 620 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg, 621 data->sg_len, direction); 622 623 align = host->align_buffer; 624 625 for_each_sg(data->sg, sg, host->sg_count, i) { 626 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) { 627 size = SDHCI_ADMA2_ALIGN - 628 (sg_dma_address(sg) & SDHCI_ADMA2_MASK); 629 630 buffer = sdhci_kmap_atomic(sg, &flags); 631 memcpy(buffer, align, size); 632 sdhci_kunmap_atomic(buffer, &flags); 633 634 align += SDHCI_ADMA2_ALIGN; 635 } 636 } 637 } 638 639 if (data->host_cookie == COOKIE_MAPPED) { 640 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 641 data->sg_len, direction); 642 data->host_cookie = COOKIE_UNMAPPED; 643 } 644 } 645 646 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd) 647 { 648 u8 count; 649 struct mmc_data *data = cmd->data; 650 unsigned target_timeout, current_timeout; 651 652 /* 653 * If the host controller provides us with an incorrect timeout 654 * value, just skip the check and use 0xE. The hardware may take 655 * longer to time out, but that's much better than having a too-short 656 * timeout value. 657 */ 658 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) 659 return 0xE; 660 661 /* Unspecified timeout, assume max */ 662 if (!data && !cmd->busy_timeout) 663 return 0xE; 664 665 /* timeout in us */ 666 if (!data) 667 target_timeout = cmd->busy_timeout * 1000; 668 else { 669 target_timeout = data->timeout_ns / 1000; 670 if (host->clock) 671 target_timeout += data->timeout_clks / host->clock; 672 } 673 674 /* 675 * Figure out needed cycles. 676 * We do this in steps in order to fit inside a 32 bit int. 677 * The first step is the minimum timeout, which will have a 678 * minimum resolution of 6 bits: 679 * (1) 2^13*1000 > 2^22, 680 * (2) host->timeout_clk < 2^16 681 * => 682 * (1) / (2) > 2^6 683 */ 684 count = 0; 685 current_timeout = (1 << 13) * 1000 / host->timeout_clk; 686 while (current_timeout < target_timeout) { 687 count++; 688 current_timeout <<= 1; 689 if (count >= 0xF) 690 break; 691 } 692 693 if (count >= 0xF) { 694 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n", 695 mmc_hostname(host->mmc), count, cmd->opcode); 696 count = 0xE; 697 } 698 699 return count; 700 } 701 702 static void sdhci_set_transfer_irqs(struct sdhci_host *host) 703 { 704 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL; 705 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR; 706 707 if (host->flags & SDHCI_REQ_USE_DMA) 708 host->ier = (host->ier & ~pio_irqs) | dma_irqs; 709 else 710 host->ier = (host->ier & ~dma_irqs) | pio_irqs; 711 712 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 713 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 714 } 715 716 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) 717 { 718 u8 count; 719 720 if (host->ops->set_timeout) { 721 host->ops->set_timeout(host, cmd); 722 } else { 723 count = sdhci_calc_timeout(host, cmd); 724 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL); 725 } 726 } 727 728 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) 729 { 730 u8 ctrl; 731 struct mmc_data *data = cmd->data; 732 int ret; 733 734 WARN_ON(host->data); 735 736 if (data || (cmd->flags & MMC_RSP_BUSY)) 737 sdhci_set_timeout(host, cmd); 738 739 if (!data) 740 return; 741 742 /* Sanity checks */ 743 BUG_ON(data->blksz * data->blocks > 524288); 744 BUG_ON(data->blksz > host->mmc->max_blk_size); 745 BUG_ON(data->blocks > 65535); 746 747 host->data = data; 748 host->data_early = 0; 749 host->data->bytes_xfered = 0; 750 751 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) 752 host->flags |= SDHCI_REQ_USE_DMA; 753 754 /* 755 * FIXME: This doesn't account for merging when mapping the 756 * scatterlist. 757 */ 758 if (host->flags & SDHCI_REQ_USE_DMA) { 759 int broken, i; 760 struct scatterlist *sg; 761 762 broken = 0; 763 if (host->flags & SDHCI_USE_ADMA) { 764 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) 765 broken = 1; 766 } else { 767 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) 768 broken = 1; 769 } 770 771 if (unlikely(broken)) { 772 for_each_sg(data->sg, sg, data->sg_len, i) { 773 if (sg->length & 0x3) { 774 DBG("Reverting to PIO because of transfer size (%d)\n", 775 sg->length); 776 host->flags &= ~SDHCI_REQ_USE_DMA; 777 break; 778 } 779 } 780 } 781 } 782 783 /* 784 * The assumption here being that alignment is the same after 785 * translation to device address space. 786 */ 787 if (host->flags & SDHCI_REQ_USE_DMA) { 788 int broken, i; 789 struct scatterlist *sg; 790 791 broken = 0; 792 if (host->flags & SDHCI_USE_ADMA) { 793 /* 794 * As we use 3 byte chunks to work around 795 * alignment problems, we need to check this 796 * quirk. 797 */ 798 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) 799 broken = 1; 800 } else { 801 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) 802 broken = 1; 803 } 804 805 if (unlikely(broken)) { 806 for_each_sg(data->sg, sg, data->sg_len, i) { 807 if (sg->offset & 0x3) { 808 DBG("Reverting to PIO because of bad alignment\n"); 809 host->flags &= ~SDHCI_REQ_USE_DMA; 810 break; 811 } 812 } 813 } 814 } 815 816 if (host->flags & SDHCI_REQ_USE_DMA) { 817 if (host->flags & SDHCI_USE_ADMA) { 818 ret = sdhci_adma_table_pre(host, data); 819 if (ret) { 820 /* 821 * This only happens when someone fed 822 * us an invalid request. 823 */ 824 WARN_ON(1); 825 host->flags &= ~SDHCI_REQ_USE_DMA; 826 } else { 827 sdhci_writel(host, host->adma_addr, 828 SDHCI_ADMA_ADDRESS); 829 if (host->flags & SDHCI_USE_64_BIT_DMA) 830 sdhci_writel(host, 831 (u64)host->adma_addr >> 32, 832 SDHCI_ADMA_ADDRESS_HI); 833 } 834 } else { 835 int sg_cnt; 836 837 sg_cnt = sdhci_pre_dma_transfer(host, data); 838 if (sg_cnt <= 0) { 839 /* 840 * This only happens when someone fed 841 * us an invalid request. 842 */ 843 WARN_ON(1); 844 host->flags &= ~SDHCI_REQ_USE_DMA; 845 } else { 846 WARN_ON(sg_cnt != 1); 847 sdhci_writel(host, sg_dma_address(data->sg), 848 SDHCI_DMA_ADDRESS); 849 } 850 } 851 } 852 853 /* 854 * Always adjust the DMA selection as some controllers 855 * (e.g. JMicron) can't do PIO properly when the selection 856 * is ADMA. 857 */ 858 if (host->version >= SDHCI_SPEC_200) { 859 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 860 ctrl &= ~SDHCI_CTRL_DMA_MASK; 861 if ((host->flags & SDHCI_REQ_USE_DMA) && 862 (host->flags & SDHCI_USE_ADMA)) { 863 if (host->flags & SDHCI_USE_64_BIT_DMA) 864 ctrl |= SDHCI_CTRL_ADMA64; 865 else 866 ctrl |= SDHCI_CTRL_ADMA32; 867 } else { 868 ctrl |= SDHCI_CTRL_SDMA; 869 } 870 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 871 } 872 873 if (!(host->flags & SDHCI_REQ_USE_DMA)) { 874 int flags; 875 876 flags = SG_MITER_ATOMIC; 877 if (host->data->flags & MMC_DATA_READ) 878 flags |= SG_MITER_TO_SG; 879 else 880 flags |= SG_MITER_FROM_SG; 881 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 882 host->blocks = data->blocks; 883 } 884 885 sdhci_set_transfer_irqs(host); 886 887 /* Set the DMA boundary value and block size */ 888 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 889 data->blksz), SDHCI_BLOCK_SIZE); 890 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); 891 } 892 893 static void sdhci_set_transfer_mode(struct sdhci_host *host, 894 struct mmc_command *cmd) 895 { 896 u16 mode = 0; 897 struct mmc_data *data = cmd->data; 898 899 if (data == NULL) { 900 if (host->quirks2 & 901 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) { 902 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE); 903 } else { 904 /* clear Auto CMD settings for no data CMDs */ 905 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE); 906 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | 907 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE); 908 } 909 return; 910 } 911 912 WARN_ON(!host->data); 913 914 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE)) 915 mode = SDHCI_TRNS_BLK_CNT_EN; 916 917 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) { 918 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI; 919 /* 920 * If we are sending CMD23, CMD12 never gets sent 921 * on successful completion (so no Auto-CMD12). 922 */ 923 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) && 924 (cmd->opcode != SD_IO_RW_EXTENDED)) 925 mode |= SDHCI_TRNS_AUTO_CMD12; 926 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) { 927 mode |= SDHCI_TRNS_AUTO_CMD23; 928 sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2); 929 } 930 } 931 932 if (data->flags & MMC_DATA_READ) 933 mode |= SDHCI_TRNS_READ; 934 if (host->flags & SDHCI_REQ_USE_DMA) 935 mode |= SDHCI_TRNS_DMA; 936 937 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE); 938 } 939 940 static void sdhci_finish_data(struct sdhci_host *host) 941 { 942 struct mmc_data *data; 943 944 BUG_ON(!host->data); 945 946 data = host->data; 947 host->data = NULL; 948 949 if (host->flags & SDHCI_REQ_USE_DMA) { 950 if (host->flags & SDHCI_USE_ADMA) 951 sdhci_adma_table_post(host, data); 952 else { 953 if (data->host_cookie == COOKIE_MAPPED) { 954 dma_unmap_sg(mmc_dev(host->mmc), 955 data->sg, data->sg_len, 956 (data->flags & MMC_DATA_READ) ? 957 DMA_FROM_DEVICE : DMA_TO_DEVICE); 958 data->host_cookie = COOKIE_UNMAPPED; 959 } 960 } 961 } 962 963 /* 964 * The specification states that the block count register must 965 * be updated, but it does not specify at what point in the 966 * data flow. That makes the register entirely useless to read 967 * back so we have to assume that nothing made it to the card 968 * in the event of an error. 969 */ 970 if (data->error) 971 data->bytes_xfered = 0; 972 else 973 data->bytes_xfered = data->blksz * data->blocks; 974 975 /* 976 * Need to send CMD12 if - 977 * a) open-ended multiblock transfer (no CMD23) 978 * b) error in multiblock transfer 979 */ 980 if (data->stop && 981 (data->error || 982 !host->mrq->sbc)) { 983 984 /* 985 * The controller needs a reset of internal state machines 986 * upon error conditions. 987 */ 988 if (data->error) { 989 sdhci_do_reset(host, SDHCI_RESET_CMD); 990 sdhci_do_reset(host, SDHCI_RESET_DATA); 991 } 992 993 sdhci_send_command(host, data->stop); 994 } else 995 tasklet_schedule(&host->finish_tasklet); 996 } 997 998 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) 999 { 1000 int flags; 1001 u32 mask; 1002 unsigned long timeout; 1003 1004 WARN_ON(host->cmd); 1005 1006 /* Wait max 10 ms */ 1007 timeout = 10; 1008 1009 mask = SDHCI_CMD_INHIBIT; 1010 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY)) 1011 mask |= SDHCI_DATA_INHIBIT; 1012 1013 /* We shouldn't wait for data inihibit for stop commands, even 1014 though they might use busy signaling */ 1015 if (host->mrq->data && (cmd == host->mrq->data->stop)) 1016 mask &= ~SDHCI_DATA_INHIBIT; 1017 1018 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { 1019 if (timeout == 0) { 1020 pr_err("%s: Controller never released inhibit bit(s).\n", 1021 mmc_hostname(host->mmc)); 1022 sdhci_dumpregs(host); 1023 cmd->error = -EIO; 1024 tasklet_schedule(&host->finish_tasklet); 1025 return; 1026 } 1027 timeout--; 1028 mdelay(1); 1029 } 1030 1031 timeout = jiffies; 1032 if (!cmd->data && cmd->busy_timeout > 9000) 1033 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; 1034 else 1035 timeout += 10 * HZ; 1036 mod_timer(&host->timer, timeout); 1037 1038 host->cmd = cmd; 1039 host->busy_handle = 0; 1040 1041 sdhci_prepare_data(host, cmd); 1042 1043 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT); 1044 1045 sdhci_set_transfer_mode(host, cmd); 1046 1047 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { 1048 pr_err("%s: Unsupported response type!\n", 1049 mmc_hostname(host->mmc)); 1050 cmd->error = -EINVAL; 1051 tasklet_schedule(&host->finish_tasklet); 1052 return; 1053 } 1054 1055 if (!(cmd->flags & MMC_RSP_PRESENT)) 1056 flags = SDHCI_CMD_RESP_NONE; 1057 else if (cmd->flags & MMC_RSP_136) 1058 flags = SDHCI_CMD_RESP_LONG; 1059 else if (cmd->flags & MMC_RSP_BUSY) 1060 flags = SDHCI_CMD_RESP_SHORT_BUSY; 1061 else 1062 flags = SDHCI_CMD_RESP_SHORT; 1063 1064 if (cmd->flags & MMC_RSP_CRC) 1065 flags |= SDHCI_CMD_CRC; 1066 if (cmd->flags & MMC_RSP_OPCODE) 1067 flags |= SDHCI_CMD_INDEX; 1068 1069 /* CMD19 is special in that the Data Present Select should be set */ 1070 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK || 1071 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200) 1072 flags |= SDHCI_CMD_DATA; 1073 1074 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND); 1075 } 1076 EXPORT_SYMBOL_GPL(sdhci_send_command); 1077 1078 static void sdhci_finish_command(struct sdhci_host *host) 1079 { 1080 int i; 1081 1082 BUG_ON(host->cmd == NULL); 1083 1084 if (host->cmd->flags & MMC_RSP_PRESENT) { 1085 if (host->cmd->flags & MMC_RSP_136) { 1086 /* CRC is stripped so we need to do some shifting. */ 1087 for (i = 0;i < 4;i++) { 1088 host->cmd->resp[i] = sdhci_readl(host, 1089 SDHCI_RESPONSE + (3-i)*4) << 8; 1090 if (i != 3) 1091 host->cmd->resp[i] |= 1092 sdhci_readb(host, 1093 SDHCI_RESPONSE + (3-i)*4-1); 1094 } 1095 } else { 1096 host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE); 1097 } 1098 } 1099 1100 host->cmd->error = 0; 1101 1102 /* Finished CMD23, now send actual command. */ 1103 if (host->cmd == host->mrq->sbc) { 1104 host->cmd = NULL; 1105 sdhci_send_command(host, host->mrq->cmd); 1106 } else { 1107 1108 /* Processed actual command. */ 1109 if (host->data && host->data_early) 1110 sdhci_finish_data(host); 1111 1112 if (!host->cmd->data) 1113 tasklet_schedule(&host->finish_tasklet); 1114 1115 host->cmd = NULL; 1116 } 1117 } 1118 1119 static u16 sdhci_get_preset_value(struct sdhci_host *host) 1120 { 1121 u16 preset = 0; 1122 1123 switch (host->timing) { 1124 case MMC_TIMING_UHS_SDR12: 1125 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); 1126 break; 1127 case MMC_TIMING_UHS_SDR25: 1128 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25); 1129 break; 1130 case MMC_TIMING_UHS_SDR50: 1131 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50); 1132 break; 1133 case MMC_TIMING_UHS_SDR104: 1134 case MMC_TIMING_MMC_HS200: 1135 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104); 1136 break; 1137 case MMC_TIMING_UHS_DDR50: 1138 case MMC_TIMING_MMC_DDR52: 1139 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50); 1140 break; 1141 case MMC_TIMING_MMC_HS400: 1142 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400); 1143 break; 1144 default: 1145 pr_warn("%s: Invalid UHS-I mode selected\n", 1146 mmc_hostname(host->mmc)); 1147 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); 1148 break; 1149 } 1150 return preset; 1151 } 1152 1153 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) 1154 { 1155 int div = 0; /* Initialized for compiler warning */ 1156 int real_div = div, clk_mul = 1; 1157 u16 clk = 0; 1158 unsigned long timeout; 1159 bool switch_base_clk = false; 1160 1161 host->mmc->actual_clock = 0; 1162 1163 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); 1164 if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST) 1165 mdelay(1); 1166 1167 if (clock == 0) 1168 return; 1169 1170 if (host->version >= SDHCI_SPEC_300) { 1171 if (host->preset_enabled) { 1172 u16 pre_val; 1173 1174 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1175 pre_val = sdhci_get_preset_value(host); 1176 div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK) 1177 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT; 1178 if (host->clk_mul && 1179 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) { 1180 clk = SDHCI_PROG_CLOCK_MODE; 1181 real_div = div + 1; 1182 clk_mul = host->clk_mul; 1183 } else { 1184 real_div = max_t(int, 1, div << 1); 1185 } 1186 goto clock_set; 1187 } 1188 1189 /* 1190 * Check if the Host Controller supports Programmable Clock 1191 * Mode. 1192 */ 1193 if (host->clk_mul) { 1194 for (div = 1; div <= 1024; div++) { 1195 if ((host->max_clk * host->clk_mul / div) 1196 <= clock) 1197 break; 1198 } 1199 if ((host->max_clk * host->clk_mul / div) <= clock) { 1200 /* 1201 * Set Programmable Clock Mode in the Clock 1202 * Control register. 1203 */ 1204 clk = SDHCI_PROG_CLOCK_MODE; 1205 real_div = div; 1206 clk_mul = host->clk_mul; 1207 div--; 1208 } else { 1209 /* 1210 * Divisor can be too small to reach clock 1211 * speed requirement. Then use the base clock. 1212 */ 1213 switch_base_clk = true; 1214 } 1215 } 1216 1217 if (!host->clk_mul || switch_base_clk) { 1218 /* Version 3.00 divisors must be a multiple of 2. */ 1219 if (host->max_clk <= clock) 1220 div = 1; 1221 else { 1222 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; 1223 div += 2) { 1224 if ((host->max_clk / div) <= clock) 1225 break; 1226 } 1227 } 1228 real_div = div; 1229 div >>= 1; 1230 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN) 1231 && !div && host->max_clk <= 25000000) 1232 div = 1; 1233 } 1234 } else { 1235 /* Version 2.00 divisors must be a power of 2. */ 1236 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) { 1237 if ((host->max_clk / div) <= clock) 1238 break; 1239 } 1240 real_div = div; 1241 div >>= 1; 1242 } 1243 1244 clock_set: 1245 if (real_div) 1246 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div; 1247 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT; 1248 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) 1249 << SDHCI_DIVIDER_HI_SHIFT; 1250 clk |= SDHCI_CLOCK_INT_EN; 1251 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1252 1253 /* Wait max 20 ms */ 1254 timeout = 20; 1255 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL)) 1256 & SDHCI_CLOCK_INT_STABLE)) { 1257 if (timeout == 0) { 1258 pr_err("%s: Internal clock never stabilised.\n", 1259 mmc_hostname(host->mmc)); 1260 sdhci_dumpregs(host); 1261 return; 1262 } 1263 timeout--; 1264 mdelay(1); 1265 } 1266 1267 clk |= SDHCI_CLOCK_CARD_EN; 1268 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1269 } 1270 EXPORT_SYMBOL_GPL(sdhci_set_clock); 1271 1272 static void sdhci_set_power(struct sdhci_host *host, unsigned char mode, 1273 unsigned short vdd) 1274 { 1275 struct mmc_host *mmc = host->mmc; 1276 u8 pwr = 0; 1277 1278 if (mode != MMC_POWER_OFF) { 1279 switch (1 << vdd) { 1280 case MMC_VDD_165_195: 1281 pwr = SDHCI_POWER_180; 1282 break; 1283 case MMC_VDD_29_30: 1284 case MMC_VDD_30_31: 1285 pwr = SDHCI_POWER_300; 1286 break; 1287 case MMC_VDD_32_33: 1288 case MMC_VDD_33_34: 1289 pwr = SDHCI_POWER_330; 1290 break; 1291 default: 1292 WARN(1, "%s: Invalid vdd %#x\n", 1293 mmc_hostname(host->mmc), vdd); 1294 break; 1295 } 1296 } 1297 1298 if (host->pwr == pwr) 1299 return; 1300 1301 host->pwr = pwr; 1302 1303 if (pwr == 0) { 1304 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 1305 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 1306 sdhci_runtime_pm_bus_off(host); 1307 vdd = 0; 1308 } else { 1309 /* 1310 * Spec says that we should clear the power reg before setting 1311 * a new value. Some controllers don't seem to like this though. 1312 */ 1313 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE)) 1314 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 1315 1316 /* 1317 * At least the Marvell CaFe chip gets confused if we set the 1318 * voltage and set turn on power at the same time, so set the 1319 * voltage first. 1320 */ 1321 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER) 1322 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); 1323 1324 pwr |= SDHCI_POWER_ON; 1325 1326 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); 1327 1328 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 1329 sdhci_runtime_pm_bus_on(host); 1330 1331 /* 1332 * Some controllers need an extra 10ms delay of 10ms before 1333 * they can apply clock after applying power 1334 */ 1335 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER) 1336 mdelay(10); 1337 } 1338 1339 if (!IS_ERR(mmc->supply.vmmc)) { 1340 spin_unlock_irq(&host->lock); 1341 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 1342 spin_lock_irq(&host->lock); 1343 } 1344 } 1345 1346 /*****************************************************************************\ 1347 * * 1348 * MMC callbacks * 1349 * * 1350 \*****************************************************************************/ 1351 1352 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) 1353 { 1354 struct sdhci_host *host; 1355 int present; 1356 unsigned long flags; 1357 1358 host = mmc_priv(mmc); 1359 1360 sdhci_runtime_pm_get(host); 1361 1362 /* Firstly check card presence */ 1363 present = mmc->ops->get_cd(mmc); 1364 1365 spin_lock_irqsave(&host->lock, flags); 1366 1367 WARN_ON(host->mrq != NULL); 1368 1369 #ifndef SDHCI_USE_LEDS_CLASS 1370 sdhci_activate_led(host); 1371 #endif 1372 1373 /* 1374 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED 1375 * requests if Auto-CMD12 is enabled. 1376 */ 1377 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) { 1378 if (mrq->stop) { 1379 mrq->data->stop = NULL; 1380 mrq->stop = NULL; 1381 } 1382 } 1383 1384 host->mrq = mrq; 1385 1386 if (!present || host->flags & SDHCI_DEVICE_DEAD) { 1387 host->mrq->cmd->error = -ENOMEDIUM; 1388 tasklet_schedule(&host->finish_tasklet); 1389 } else { 1390 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23)) 1391 sdhci_send_command(host, mrq->sbc); 1392 else 1393 sdhci_send_command(host, mrq->cmd); 1394 } 1395 1396 mmiowb(); 1397 spin_unlock_irqrestore(&host->lock, flags); 1398 } 1399 1400 void sdhci_set_bus_width(struct sdhci_host *host, int width) 1401 { 1402 u8 ctrl; 1403 1404 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 1405 if (width == MMC_BUS_WIDTH_8) { 1406 ctrl &= ~SDHCI_CTRL_4BITBUS; 1407 if (host->version >= SDHCI_SPEC_300) 1408 ctrl |= SDHCI_CTRL_8BITBUS; 1409 } else { 1410 if (host->version >= SDHCI_SPEC_300) 1411 ctrl &= ~SDHCI_CTRL_8BITBUS; 1412 if (width == MMC_BUS_WIDTH_4) 1413 ctrl |= SDHCI_CTRL_4BITBUS; 1414 else 1415 ctrl &= ~SDHCI_CTRL_4BITBUS; 1416 } 1417 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1418 } 1419 EXPORT_SYMBOL_GPL(sdhci_set_bus_width); 1420 1421 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing) 1422 { 1423 u16 ctrl_2; 1424 1425 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1426 /* Select Bus Speed Mode for host */ 1427 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 1428 if ((timing == MMC_TIMING_MMC_HS200) || 1429 (timing == MMC_TIMING_UHS_SDR104)) 1430 ctrl_2 |= SDHCI_CTRL_UHS_SDR104; 1431 else if (timing == MMC_TIMING_UHS_SDR12) 1432 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 1433 else if (timing == MMC_TIMING_UHS_SDR25) 1434 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 1435 else if (timing == MMC_TIMING_UHS_SDR50) 1436 ctrl_2 |= SDHCI_CTRL_UHS_SDR50; 1437 else if ((timing == MMC_TIMING_UHS_DDR50) || 1438 (timing == MMC_TIMING_MMC_DDR52)) 1439 ctrl_2 |= SDHCI_CTRL_UHS_DDR50; 1440 else if (timing == MMC_TIMING_MMC_HS400) 1441 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */ 1442 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 1443 } 1444 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling); 1445 1446 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) 1447 { 1448 unsigned long flags; 1449 u8 ctrl; 1450 struct mmc_host *mmc = host->mmc; 1451 1452 spin_lock_irqsave(&host->lock, flags); 1453 1454 if (host->flags & SDHCI_DEVICE_DEAD) { 1455 spin_unlock_irqrestore(&host->lock, flags); 1456 if (!IS_ERR(mmc->supply.vmmc) && 1457 ios->power_mode == MMC_POWER_OFF) 1458 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 1459 return; 1460 } 1461 1462 /* 1463 * Reset the chip on each power off. 1464 * Should clear out any weird states. 1465 */ 1466 if (ios->power_mode == MMC_POWER_OFF) { 1467 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 1468 sdhci_reinit(host); 1469 } 1470 1471 if (host->version >= SDHCI_SPEC_300 && 1472 (ios->power_mode == MMC_POWER_UP) && 1473 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) 1474 sdhci_enable_preset_value(host, false); 1475 1476 if (!ios->clock || ios->clock != host->clock) { 1477 host->ops->set_clock(host, ios->clock); 1478 host->clock = ios->clock; 1479 1480 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK && 1481 host->clock) { 1482 host->timeout_clk = host->mmc->actual_clock ? 1483 host->mmc->actual_clock / 1000 : 1484 host->clock / 1000; 1485 host->mmc->max_busy_timeout = 1486 host->ops->get_max_timeout_count ? 1487 host->ops->get_max_timeout_count(host) : 1488 1 << 27; 1489 host->mmc->max_busy_timeout /= host->timeout_clk; 1490 } 1491 } 1492 1493 sdhci_set_power(host, ios->power_mode, ios->vdd); 1494 1495 if (host->ops->platform_send_init_74_clocks) 1496 host->ops->platform_send_init_74_clocks(host, ios->power_mode); 1497 1498 host->ops->set_bus_width(host, ios->bus_width); 1499 1500 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 1501 1502 if ((ios->timing == MMC_TIMING_SD_HS || 1503 ios->timing == MMC_TIMING_MMC_HS) 1504 && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) 1505 ctrl |= SDHCI_CTRL_HISPD; 1506 else 1507 ctrl &= ~SDHCI_CTRL_HISPD; 1508 1509 if (host->version >= SDHCI_SPEC_300) { 1510 u16 clk, ctrl_2; 1511 1512 /* In case of UHS-I modes, set High Speed Enable */ 1513 if ((ios->timing == MMC_TIMING_MMC_HS400) || 1514 (ios->timing == MMC_TIMING_MMC_HS200) || 1515 (ios->timing == MMC_TIMING_MMC_DDR52) || 1516 (ios->timing == MMC_TIMING_UHS_SDR50) || 1517 (ios->timing == MMC_TIMING_UHS_SDR104) || 1518 (ios->timing == MMC_TIMING_UHS_DDR50) || 1519 (ios->timing == MMC_TIMING_UHS_SDR25)) 1520 ctrl |= SDHCI_CTRL_HISPD; 1521 1522 if (!host->preset_enabled) { 1523 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1524 /* 1525 * We only need to set Driver Strength if the 1526 * preset value enable is not set. 1527 */ 1528 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1529 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK; 1530 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A) 1531 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A; 1532 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B) 1533 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B; 1534 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C) 1535 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; 1536 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D) 1537 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D; 1538 else { 1539 pr_warn("%s: invalid driver type, default to driver type B\n", 1540 mmc_hostname(mmc)); 1541 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B; 1542 } 1543 1544 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 1545 } else { 1546 /* 1547 * According to SDHC Spec v3.00, if the Preset Value 1548 * Enable in the Host Control 2 register is set, we 1549 * need to reset SD Clock Enable before changing High 1550 * Speed Enable to avoid generating clock gliches. 1551 */ 1552 1553 /* Reset SD Clock Enable */ 1554 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1555 clk &= ~SDHCI_CLOCK_CARD_EN; 1556 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1557 1558 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1559 1560 /* Re-enable SD Clock */ 1561 host->ops->set_clock(host, host->clock); 1562 } 1563 1564 /* Reset SD Clock Enable */ 1565 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1566 clk &= ~SDHCI_CLOCK_CARD_EN; 1567 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1568 1569 host->ops->set_uhs_signaling(host, ios->timing); 1570 host->timing = ios->timing; 1571 1572 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) && 1573 ((ios->timing == MMC_TIMING_UHS_SDR12) || 1574 (ios->timing == MMC_TIMING_UHS_SDR25) || 1575 (ios->timing == MMC_TIMING_UHS_SDR50) || 1576 (ios->timing == MMC_TIMING_UHS_SDR104) || 1577 (ios->timing == MMC_TIMING_UHS_DDR50) || 1578 (ios->timing == MMC_TIMING_MMC_DDR52))) { 1579 u16 preset; 1580 1581 sdhci_enable_preset_value(host, true); 1582 preset = sdhci_get_preset_value(host); 1583 ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK) 1584 >> SDHCI_PRESET_DRV_SHIFT; 1585 } 1586 1587 /* Re-enable SD Clock */ 1588 host->ops->set_clock(host, host->clock); 1589 } else 1590 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1591 1592 /* 1593 * Some (ENE) controllers go apeshit on some ios operation, 1594 * signalling timeout and CRC errors even on CMD0. Resetting 1595 * it on each ios seems to solve the problem. 1596 */ 1597 if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS) 1598 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 1599 1600 mmiowb(); 1601 spin_unlock_irqrestore(&host->lock, flags); 1602 } 1603 1604 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1605 { 1606 struct sdhci_host *host = mmc_priv(mmc); 1607 1608 sdhci_runtime_pm_get(host); 1609 sdhci_do_set_ios(host, ios); 1610 sdhci_runtime_pm_put(host); 1611 } 1612 1613 static int sdhci_do_get_cd(struct sdhci_host *host) 1614 { 1615 int gpio_cd = mmc_gpio_get_cd(host->mmc); 1616 1617 if (host->flags & SDHCI_DEVICE_DEAD) 1618 return 0; 1619 1620 /* If nonremovable, assume that the card is always present. */ 1621 if (host->mmc->caps & MMC_CAP_NONREMOVABLE) 1622 return 1; 1623 1624 /* 1625 * Try slot gpio detect, if defined it take precedence 1626 * over build in controller functionality 1627 */ 1628 if (!IS_ERR_VALUE(gpio_cd)) 1629 return !!gpio_cd; 1630 1631 /* If polling, assume that the card is always present. */ 1632 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) 1633 return 1; 1634 1635 /* Host native card detect */ 1636 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); 1637 } 1638 1639 static int sdhci_get_cd(struct mmc_host *mmc) 1640 { 1641 struct sdhci_host *host = mmc_priv(mmc); 1642 int ret; 1643 1644 sdhci_runtime_pm_get(host); 1645 ret = sdhci_do_get_cd(host); 1646 sdhci_runtime_pm_put(host); 1647 return ret; 1648 } 1649 1650 static int sdhci_check_ro(struct sdhci_host *host) 1651 { 1652 unsigned long flags; 1653 int is_readonly; 1654 1655 spin_lock_irqsave(&host->lock, flags); 1656 1657 if (host->flags & SDHCI_DEVICE_DEAD) 1658 is_readonly = 0; 1659 else if (host->ops->get_ro) 1660 is_readonly = host->ops->get_ro(host); 1661 else 1662 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) 1663 & SDHCI_WRITE_PROTECT); 1664 1665 spin_unlock_irqrestore(&host->lock, flags); 1666 1667 /* This quirk needs to be replaced by a callback-function later */ 1668 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ? 1669 !is_readonly : is_readonly; 1670 } 1671 1672 #define SAMPLE_COUNT 5 1673 1674 static int sdhci_do_get_ro(struct sdhci_host *host) 1675 { 1676 int i, ro_count; 1677 1678 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT)) 1679 return sdhci_check_ro(host); 1680 1681 ro_count = 0; 1682 for (i = 0; i < SAMPLE_COUNT; i++) { 1683 if (sdhci_check_ro(host)) { 1684 if (++ro_count > SAMPLE_COUNT / 2) 1685 return 1; 1686 } 1687 msleep(30); 1688 } 1689 return 0; 1690 } 1691 1692 static void sdhci_hw_reset(struct mmc_host *mmc) 1693 { 1694 struct sdhci_host *host = mmc_priv(mmc); 1695 1696 if (host->ops && host->ops->hw_reset) 1697 host->ops->hw_reset(host); 1698 } 1699 1700 static int sdhci_get_ro(struct mmc_host *mmc) 1701 { 1702 struct sdhci_host *host = mmc_priv(mmc); 1703 int ret; 1704 1705 sdhci_runtime_pm_get(host); 1706 ret = sdhci_do_get_ro(host); 1707 sdhci_runtime_pm_put(host); 1708 return ret; 1709 } 1710 1711 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable) 1712 { 1713 if (!(host->flags & SDHCI_DEVICE_DEAD)) { 1714 if (enable) 1715 host->ier |= SDHCI_INT_CARD_INT; 1716 else 1717 host->ier &= ~SDHCI_INT_CARD_INT; 1718 1719 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 1720 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 1721 mmiowb(); 1722 } 1723 } 1724 1725 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) 1726 { 1727 struct sdhci_host *host = mmc_priv(mmc); 1728 unsigned long flags; 1729 1730 sdhci_runtime_pm_get(host); 1731 1732 spin_lock_irqsave(&host->lock, flags); 1733 if (enable) 1734 host->flags |= SDHCI_SDIO_IRQ_ENABLED; 1735 else 1736 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED; 1737 1738 sdhci_enable_sdio_irq_nolock(host, enable); 1739 spin_unlock_irqrestore(&host->lock, flags); 1740 1741 sdhci_runtime_pm_put(host); 1742 } 1743 1744 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host, 1745 struct mmc_ios *ios) 1746 { 1747 struct mmc_host *mmc = host->mmc; 1748 u16 ctrl; 1749 int ret; 1750 1751 /* 1752 * Signal Voltage Switching is only applicable for Host Controllers 1753 * v3.00 and above. 1754 */ 1755 if (host->version < SDHCI_SPEC_300) 1756 return 0; 1757 1758 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1759 1760 switch (ios->signal_voltage) { 1761 case MMC_SIGNAL_VOLTAGE_330: 1762 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ 1763 ctrl &= ~SDHCI_CTRL_VDD_180; 1764 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1765 1766 if (!IS_ERR(mmc->supply.vqmmc)) { 1767 ret = regulator_set_voltage(mmc->supply.vqmmc, 2700000, 1768 3600000); 1769 if (ret) { 1770 pr_warn("%s: Switching to 3.3V signalling voltage failed\n", 1771 mmc_hostname(mmc)); 1772 return -EIO; 1773 } 1774 } 1775 /* Wait for 5ms */ 1776 usleep_range(5000, 5500); 1777 1778 /* 3.3V regulator output should be stable within 5 ms */ 1779 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1780 if (!(ctrl & SDHCI_CTRL_VDD_180)) 1781 return 0; 1782 1783 pr_warn("%s: 3.3V regulator output did not became stable\n", 1784 mmc_hostname(mmc)); 1785 1786 return -EAGAIN; 1787 case MMC_SIGNAL_VOLTAGE_180: 1788 if (!IS_ERR(mmc->supply.vqmmc)) { 1789 ret = regulator_set_voltage(mmc->supply.vqmmc, 1790 1700000, 1950000); 1791 if (ret) { 1792 pr_warn("%s: Switching to 1.8V signalling voltage failed\n", 1793 mmc_hostname(mmc)); 1794 return -EIO; 1795 } 1796 } 1797 1798 /* 1799 * Enable 1.8V Signal Enable in the Host Control2 1800 * register 1801 */ 1802 ctrl |= SDHCI_CTRL_VDD_180; 1803 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1804 1805 /* Some controller need to do more when switching */ 1806 if (host->ops->voltage_switch) 1807 host->ops->voltage_switch(host); 1808 1809 /* 1.8V regulator output should be stable within 5 ms */ 1810 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1811 if (ctrl & SDHCI_CTRL_VDD_180) 1812 return 0; 1813 1814 pr_warn("%s: 1.8V regulator output did not became stable\n", 1815 mmc_hostname(mmc)); 1816 1817 return -EAGAIN; 1818 case MMC_SIGNAL_VOLTAGE_120: 1819 if (!IS_ERR(mmc->supply.vqmmc)) { 1820 ret = regulator_set_voltage(mmc->supply.vqmmc, 1100000, 1821 1300000); 1822 if (ret) { 1823 pr_warn("%s: Switching to 1.2V signalling voltage failed\n", 1824 mmc_hostname(mmc)); 1825 return -EIO; 1826 } 1827 } 1828 return 0; 1829 default: 1830 /* No signal voltage switch required */ 1831 return 0; 1832 } 1833 } 1834 1835 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, 1836 struct mmc_ios *ios) 1837 { 1838 struct sdhci_host *host = mmc_priv(mmc); 1839 int err; 1840 1841 if (host->version < SDHCI_SPEC_300) 1842 return 0; 1843 sdhci_runtime_pm_get(host); 1844 err = sdhci_do_start_signal_voltage_switch(host, ios); 1845 sdhci_runtime_pm_put(host); 1846 return err; 1847 } 1848 1849 static int sdhci_card_busy(struct mmc_host *mmc) 1850 { 1851 struct sdhci_host *host = mmc_priv(mmc); 1852 u32 present_state; 1853 1854 sdhci_runtime_pm_get(host); 1855 /* Check whether DAT[3:0] is 0000 */ 1856 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE); 1857 sdhci_runtime_pm_put(host); 1858 1859 return !(present_state & SDHCI_DATA_LVL_MASK); 1860 } 1861 1862 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios) 1863 { 1864 struct sdhci_host *host = mmc_priv(mmc); 1865 unsigned long flags; 1866 1867 spin_lock_irqsave(&host->lock, flags); 1868 host->flags |= SDHCI_HS400_TUNING; 1869 spin_unlock_irqrestore(&host->lock, flags); 1870 1871 return 0; 1872 } 1873 1874 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) 1875 { 1876 struct sdhci_host *host = mmc_priv(mmc); 1877 u16 ctrl; 1878 int tuning_loop_counter = MAX_TUNING_LOOP; 1879 int err = 0; 1880 unsigned long flags; 1881 unsigned int tuning_count = 0; 1882 bool hs400_tuning; 1883 1884 sdhci_runtime_pm_get(host); 1885 spin_lock_irqsave(&host->lock, flags); 1886 1887 hs400_tuning = host->flags & SDHCI_HS400_TUNING; 1888 host->flags &= ~SDHCI_HS400_TUNING; 1889 1890 if (host->tuning_mode == SDHCI_TUNING_MODE_1) 1891 tuning_count = host->tuning_count; 1892 1893 /* 1894 * The Host Controller needs tuning in case of SDR104 and DDR50 1895 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in 1896 * the Capabilities register. 1897 * If the Host Controller supports the HS200 mode then the 1898 * tuning function has to be executed. 1899 */ 1900 switch (host->timing) { 1901 /* HS400 tuning is done in HS200 mode */ 1902 case MMC_TIMING_MMC_HS400: 1903 err = -EINVAL; 1904 goto out_unlock; 1905 1906 case MMC_TIMING_MMC_HS200: 1907 /* 1908 * Periodic re-tuning for HS400 is not expected to be needed, so 1909 * disable it here. 1910 */ 1911 if (hs400_tuning) 1912 tuning_count = 0; 1913 break; 1914 1915 case MMC_TIMING_UHS_SDR104: 1916 case MMC_TIMING_UHS_DDR50: 1917 break; 1918 1919 case MMC_TIMING_UHS_SDR50: 1920 if (host->flags & SDHCI_SDR50_NEEDS_TUNING || 1921 host->flags & SDHCI_SDR104_NEEDS_TUNING) 1922 break; 1923 /* FALLTHROUGH */ 1924 1925 default: 1926 goto out_unlock; 1927 } 1928 1929 if (host->ops->platform_execute_tuning) { 1930 spin_unlock_irqrestore(&host->lock, flags); 1931 err = host->ops->platform_execute_tuning(host, opcode); 1932 sdhci_runtime_pm_put(host); 1933 return err; 1934 } 1935 1936 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1937 ctrl |= SDHCI_CTRL_EXEC_TUNING; 1938 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND) 1939 ctrl |= SDHCI_CTRL_TUNED_CLK; 1940 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1941 1942 /* 1943 * As per the Host Controller spec v3.00, tuning command 1944 * generates Buffer Read Ready interrupt, so enable that. 1945 * 1946 * Note: The spec clearly says that when tuning sequence 1947 * is being performed, the controller does not generate 1948 * interrupts other than Buffer Read Ready interrupt. But 1949 * to make sure we don't hit a controller bug, we _only_ 1950 * enable Buffer Read Ready interrupt here. 1951 */ 1952 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE); 1953 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE); 1954 1955 /* 1956 * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number 1957 * of loops reaches 40 times or a timeout of 150ms occurs. 1958 */ 1959 do { 1960 struct mmc_command cmd = {0}; 1961 struct mmc_request mrq = {NULL}; 1962 1963 cmd.opcode = opcode; 1964 cmd.arg = 0; 1965 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 1966 cmd.retries = 0; 1967 cmd.data = NULL; 1968 cmd.error = 0; 1969 1970 if (tuning_loop_counter-- == 0) 1971 break; 1972 1973 mrq.cmd = &cmd; 1974 host->mrq = &mrq; 1975 1976 /* 1977 * In response to CMD19, the card sends 64 bytes of tuning 1978 * block to the Host Controller. So we set the block size 1979 * to 64 here. 1980 */ 1981 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) { 1982 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) 1983 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128), 1984 SDHCI_BLOCK_SIZE); 1985 else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) 1986 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), 1987 SDHCI_BLOCK_SIZE); 1988 } else { 1989 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), 1990 SDHCI_BLOCK_SIZE); 1991 } 1992 1993 /* 1994 * The tuning block is sent by the card to the host controller. 1995 * So we set the TRNS_READ bit in the Transfer Mode register. 1996 * This also takes care of setting DMA Enable and Multi Block 1997 * Select in the same register to 0. 1998 */ 1999 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE); 2000 2001 sdhci_send_command(host, &cmd); 2002 2003 host->cmd = NULL; 2004 host->mrq = NULL; 2005 2006 spin_unlock_irqrestore(&host->lock, flags); 2007 /* Wait for Buffer Read Ready interrupt */ 2008 wait_event_interruptible_timeout(host->buf_ready_int, 2009 (host->tuning_done == 1), 2010 msecs_to_jiffies(50)); 2011 spin_lock_irqsave(&host->lock, flags); 2012 2013 if (!host->tuning_done) { 2014 pr_info(DRIVER_NAME ": Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock\n"); 2015 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2016 ctrl &= ~SDHCI_CTRL_TUNED_CLK; 2017 ctrl &= ~SDHCI_CTRL_EXEC_TUNING; 2018 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2019 2020 err = -EIO; 2021 goto out; 2022 } 2023 2024 host->tuning_done = 0; 2025 2026 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2027 2028 /* eMMC spec does not require a delay between tuning cycles */ 2029 if (opcode == MMC_SEND_TUNING_BLOCK) 2030 mdelay(1); 2031 } while (ctrl & SDHCI_CTRL_EXEC_TUNING); 2032 2033 /* 2034 * The Host Driver has exhausted the maximum number of loops allowed, 2035 * so use fixed sampling frequency. 2036 */ 2037 if (tuning_loop_counter < 0) { 2038 ctrl &= ~SDHCI_CTRL_TUNED_CLK; 2039 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2040 } 2041 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) { 2042 pr_info(DRIVER_NAME ": Tuning procedure failed, falling back to fixed sampling clock\n"); 2043 err = -EIO; 2044 } 2045 2046 out: 2047 if (tuning_count) { 2048 /* 2049 * In case tuning fails, host controllers which support 2050 * re-tuning can try tuning again at a later time, when the 2051 * re-tuning timer expires. So for these controllers, we 2052 * return 0. Since there might be other controllers who do not 2053 * have this capability, we return error for them. 2054 */ 2055 err = 0; 2056 } 2057 2058 host->mmc->retune_period = err ? 0 : tuning_count; 2059 2060 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 2061 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 2062 out_unlock: 2063 spin_unlock_irqrestore(&host->lock, flags); 2064 sdhci_runtime_pm_put(host); 2065 2066 return err; 2067 } 2068 2069 static int sdhci_select_drive_strength(struct mmc_card *card, 2070 unsigned int max_dtr, int host_drv, 2071 int card_drv, int *drv_type) 2072 { 2073 struct sdhci_host *host = mmc_priv(card->host); 2074 2075 if (!host->ops->select_drive_strength) 2076 return 0; 2077 2078 return host->ops->select_drive_strength(host, card, max_dtr, host_drv, 2079 card_drv, drv_type); 2080 } 2081 2082 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable) 2083 { 2084 /* Host Controller v3.00 defines preset value registers */ 2085 if (host->version < SDHCI_SPEC_300) 2086 return; 2087 2088 /* 2089 * We only enable or disable Preset Value if they are not already 2090 * enabled or disabled respectively. Otherwise, we bail out. 2091 */ 2092 if (host->preset_enabled != enable) { 2093 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2094 2095 if (enable) 2096 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE; 2097 else 2098 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE; 2099 2100 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2101 2102 if (enable) 2103 host->flags |= SDHCI_PV_ENABLED; 2104 else 2105 host->flags &= ~SDHCI_PV_ENABLED; 2106 2107 host->preset_enabled = enable; 2108 } 2109 } 2110 2111 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq, 2112 int err) 2113 { 2114 struct sdhci_host *host = mmc_priv(mmc); 2115 struct mmc_data *data = mrq->data; 2116 2117 if (host->flags & SDHCI_REQ_USE_DMA) { 2118 if (data->host_cookie == COOKIE_GIVEN || 2119 data->host_cookie == COOKIE_MAPPED) 2120 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, 2121 data->flags & MMC_DATA_WRITE ? 2122 DMA_TO_DEVICE : DMA_FROM_DEVICE); 2123 data->host_cookie = COOKIE_UNMAPPED; 2124 } 2125 } 2126 2127 static int sdhci_pre_dma_transfer(struct sdhci_host *host, 2128 struct mmc_data *data) 2129 { 2130 int sg_count; 2131 2132 if (data->host_cookie == COOKIE_MAPPED) { 2133 data->host_cookie = COOKIE_GIVEN; 2134 return data->sg_count; 2135 } 2136 2137 WARN_ON(data->host_cookie == COOKIE_GIVEN); 2138 2139 sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, 2140 data->flags & MMC_DATA_WRITE ? 2141 DMA_TO_DEVICE : DMA_FROM_DEVICE); 2142 2143 if (sg_count == 0) 2144 return -ENOSPC; 2145 2146 data->sg_count = sg_count; 2147 data->host_cookie = COOKIE_MAPPED; 2148 2149 return sg_count; 2150 } 2151 2152 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq, 2153 bool is_first_req) 2154 { 2155 struct sdhci_host *host = mmc_priv(mmc); 2156 2157 mrq->data->host_cookie = COOKIE_UNMAPPED; 2158 2159 if (host->flags & SDHCI_REQ_USE_DMA) 2160 sdhci_pre_dma_transfer(host, mrq->data); 2161 } 2162 2163 static void sdhci_card_event(struct mmc_host *mmc) 2164 { 2165 struct sdhci_host *host = mmc_priv(mmc); 2166 unsigned long flags; 2167 int present; 2168 2169 /* First check if client has provided their own card event */ 2170 if (host->ops->card_event) 2171 host->ops->card_event(host); 2172 2173 present = sdhci_do_get_cd(host); 2174 2175 spin_lock_irqsave(&host->lock, flags); 2176 2177 /* Check host->mrq first in case we are runtime suspended */ 2178 if (host->mrq && !present) { 2179 pr_err("%s: Card removed during transfer!\n", 2180 mmc_hostname(host->mmc)); 2181 pr_err("%s: Resetting controller.\n", 2182 mmc_hostname(host->mmc)); 2183 2184 sdhci_do_reset(host, SDHCI_RESET_CMD); 2185 sdhci_do_reset(host, SDHCI_RESET_DATA); 2186 2187 host->mrq->cmd->error = -ENOMEDIUM; 2188 tasklet_schedule(&host->finish_tasklet); 2189 } 2190 2191 spin_unlock_irqrestore(&host->lock, flags); 2192 } 2193 2194 static const struct mmc_host_ops sdhci_ops = { 2195 .request = sdhci_request, 2196 .post_req = sdhci_post_req, 2197 .pre_req = sdhci_pre_req, 2198 .set_ios = sdhci_set_ios, 2199 .get_cd = sdhci_get_cd, 2200 .get_ro = sdhci_get_ro, 2201 .hw_reset = sdhci_hw_reset, 2202 .enable_sdio_irq = sdhci_enable_sdio_irq, 2203 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch, 2204 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning, 2205 .execute_tuning = sdhci_execute_tuning, 2206 .select_drive_strength = sdhci_select_drive_strength, 2207 .card_event = sdhci_card_event, 2208 .card_busy = sdhci_card_busy, 2209 }; 2210 2211 /*****************************************************************************\ 2212 * * 2213 * Tasklets * 2214 * * 2215 \*****************************************************************************/ 2216 2217 static void sdhci_tasklet_finish(unsigned long param) 2218 { 2219 struct sdhci_host *host; 2220 unsigned long flags; 2221 struct mmc_request *mrq; 2222 2223 host = (struct sdhci_host*)param; 2224 2225 spin_lock_irqsave(&host->lock, flags); 2226 2227 /* 2228 * If this tasklet gets rescheduled while running, it will 2229 * be run again afterwards but without any active request. 2230 */ 2231 if (!host->mrq) { 2232 spin_unlock_irqrestore(&host->lock, flags); 2233 return; 2234 } 2235 2236 del_timer(&host->timer); 2237 2238 mrq = host->mrq; 2239 2240 /* 2241 * The controller needs a reset of internal state machines 2242 * upon error conditions. 2243 */ 2244 if (!(host->flags & SDHCI_DEVICE_DEAD) && 2245 ((mrq->cmd && mrq->cmd->error) || 2246 (mrq->sbc && mrq->sbc->error) || 2247 (mrq->data && ((mrq->data->error && !mrq->data->stop) || 2248 (mrq->data->stop && mrq->data->stop->error))) || 2249 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) { 2250 2251 /* Some controllers need this kick or reset won't work here */ 2252 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) 2253 /* This is to force an update */ 2254 host->ops->set_clock(host, host->clock); 2255 2256 /* Spec says we should do both at the same time, but Ricoh 2257 controllers do not like that. */ 2258 sdhci_do_reset(host, SDHCI_RESET_CMD); 2259 sdhci_do_reset(host, SDHCI_RESET_DATA); 2260 } 2261 2262 host->mrq = NULL; 2263 host->cmd = NULL; 2264 host->data = NULL; 2265 2266 #ifndef SDHCI_USE_LEDS_CLASS 2267 sdhci_deactivate_led(host); 2268 #endif 2269 2270 mmiowb(); 2271 spin_unlock_irqrestore(&host->lock, flags); 2272 2273 mmc_request_done(host->mmc, mrq); 2274 sdhci_runtime_pm_put(host); 2275 } 2276 2277 static void sdhci_timeout_timer(unsigned long data) 2278 { 2279 struct sdhci_host *host; 2280 unsigned long flags; 2281 2282 host = (struct sdhci_host*)data; 2283 2284 spin_lock_irqsave(&host->lock, flags); 2285 2286 if (host->mrq) { 2287 pr_err("%s: Timeout waiting for hardware interrupt.\n", 2288 mmc_hostname(host->mmc)); 2289 sdhci_dumpregs(host); 2290 2291 if (host->data) { 2292 host->data->error = -ETIMEDOUT; 2293 sdhci_finish_data(host); 2294 } else { 2295 if (host->cmd) 2296 host->cmd->error = -ETIMEDOUT; 2297 else 2298 host->mrq->cmd->error = -ETIMEDOUT; 2299 2300 tasklet_schedule(&host->finish_tasklet); 2301 } 2302 } 2303 2304 mmiowb(); 2305 spin_unlock_irqrestore(&host->lock, flags); 2306 } 2307 2308 /*****************************************************************************\ 2309 * * 2310 * Interrupt handling * 2311 * * 2312 \*****************************************************************************/ 2313 2314 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask) 2315 { 2316 BUG_ON(intmask == 0); 2317 2318 if (!host->cmd) { 2319 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n", 2320 mmc_hostname(host->mmc), (unsigned)intmask); 2321 sdhci_dumpregs(host); 2322 return; 2323 } 2324 2325 if (intmask & SDHCI_INT_TIMEOUT) 2326 host->cmd->error = -ETIMEDOUT; 2327 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT | 2328 SDHCI_INT_INDEX)) 2329 host->cmd->error = -EILSEQ; 2330 2331 if (host->cmd->error) { 2332 tasklet_schedule(&host->finish_tasklet); 2333 return; 2334 } 2335 2336 /* 2337 * The host can send and interrupt when the busy state has 2338 * ended, allowing us to wait without wasting CPU cycles. 2339 * Unfortunately this is overloaded on the "data complete" 2340 * interrupt, so we need to take some care when handling 2341 * it. 2342 * 2343 * Note: The 1.0 specification is a bit ambiguous about this 2344 * feature so there might be some problems with older 2345 * controllers. 2346 */ 2347 if (host->cmd->flags & MMC_RSP_BUSY) { 2348 if (host->cmd->data) 2349 DBG("Cannot wait for busy signal when also doing a data transfer"); 2350 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) 2351 && !host->busy_handle) { 2352 /* Mark that command complete before busy is ended */ 2353 host->busy_handle = 1; 2354 return; 2355 } 2356 2357 /* The controller does not support the end-of-busy IRQ, 2358 * fall through and take the SDHCI_INT_RESPONSE */ 2359 } else if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) && 2360 host->cmd->opcode == MMC_STOP_TRANSMISSION && !host->data) { 2361 *mask &= ~SDHCI_INT_DATA_END; 2362 } 2363 2364 if (intmask & SDHCI_INT_RESPONSE) 2365 sdhci_finish_command(host); 2366 } 2367 2368 #ifdef CONFIG_MMC_DEBUG 2369 static void sdhci_adma_show_error(struct sdhci_host *host) 2370 { 2371 const char *name = mmc_hostname(host->mmc); 2372 void *desc = host->adma_table; 2373 2374 sdhci_dumpregs(host); 2375 2376 while (true) { 2377 struct sdhci_adma2_64_desc *dma_desc = desc; 2378 2379 if (host->flags & SDHCI_USE_64_BIT_DMA) 2380 DBG("%s: %p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n", 2381 name, desc, le32_to_cpu(dma_desc->addr_hi), 2382 le32_to_cpu(dma_desc->addr_lo), 2383 le16_to_cpu(dma_desc->len), 2384 le16_to_cpu(dma_desc->cmd)); 2385 else 2386 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n", 2387 name, desc, le32_to_cpu(dma_desc->addr_lo), 2388 le16_to_cpu(dma_desc->len), 2389 le16_to_cpu(dma_desc->cmd)); 2390 2391 desc += host->desc_sz; 2392 2393 if (dma_desc->cmd & cpu_to_le16(ADMA2_END)) 2394 break; 2395 } 2396 } 2397 #else 2398 static void sdhci_adma_show_error(struct sdhci_host *host) { } 2399 #endif 2400 2401 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) 2402 { 2403 u32 command; 2404 BUG_ON(intmask == 0); 2405 2406 /* CMD19 generates _only_ Buffer Read Ready interrupt */ 2407 if (intmask & SDHCI_INT_DATA_AVAIL) { 2408 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)); 2409 if (command == MMC_SEND_TUNING_BLOCK || 2410 command == MMC_SEND_TUNING_BLOCK_HS200) { 2411 host->tuning_done = 1; 2412 wake_up(&host->buf_ready_int); 2413 return; 2414 } 2415 } 2416 2417 if (!host->data) { 2418 /* 2419 * The "data complete" interrupt is also used to 2420 * indicate that a busy state has ended. See comment 2421 * above in sdhci_cmd_irq(). 2422 */ 2423 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) { 2424 if (intmask & SDHCI_INT_DATA_TIMEOUT) { 2425 host->cmd->error = -ETIMEDOUT; 2426 tasklet_schedule(&host->finish_tasklet); 2427 return; 2428 } 2429 if (intmask & SDHCI_INT_DATA_END) { 2430 /* 2431 * Some cards handle busy-end interrupt 2432 * before the command completed, so make 2433 * sure we do things in the proper order. 2434 */ 2435 if (host->busy_handle) 2436 sdhci_finish_command(host); 2437 else 2438 host->busy_handle = 1; 2439 return; 2440 } 2441 } 2442 2443 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n", 2444 mmc_hostname(host->mmc), (unsigned)intmask); 2445 sdhci_dumpregs(host); 2446 2447 return; 2448 } 2449 2450 if (intmask & SDHCI_INT_DATA_TIMEOUT) 2451 host->data->error = -ETIMEDOUT; 2452 else if (intmask & SDHCI_INT_DATA_END_BIT) 2453 host->data->error = -EILSEQ; 2454 else if ((intmask & SDHCI_INT_DATA_CRC) && 2455 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)) 2456 != MMC_BUS_TEST_R) 2457 host->data->error = -EILSEQ; 2458 else if (intmask & SDHCI_INT_ADMA_ERROR) { 2459 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc)); 2460 sdhci_adma_show_error(host); 2461 host->data->error = -EIO; 2462 if (host->ops->adma_workaround) 2463 host->ops->adma_workaround(host, intmask); 2464 } 2465 2466 if (host->data->error) 2467 sdhci_finish_data(host); 2468 else { 2469 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)) 2470 sdhci_transfer_pio(host); 2471 2472 /* 2473 * We currently don't do anything fancy with DMA 2474 * boundaries, but as we can't disable the feature 2475 * we need to at least restart the transfer. 2476 * 2477 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS) 2478 * should return a valid address to continue from, but as 2479 * some controllers are faulty, don't trust them. 2480 */ 2481 if (intmask & SDHCI_INT_DMA_END) { 2482 u32 dmastart, dmanow; 2483 dmastart = sg_dma_address(host->data->sg); 2484 dmanow = dmastart + host->data->bytes_xfered; 2485 /* 2486 * Force update to the next DMA block boundary. 2487 */ 2488 dmanow = (dmanow & 2489 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) + 2490 SDHCI_DEFAULT_BOUNDARY_SIZE; 2491 host->data->bytes_xfered = dmanow - dmastart; 2492 DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes," 2493 " next 0x%08x\n", 2494 mmc_hostname(host->mmc), dmastart, 2495 host->data->bytes_xfered, dmanow); 2496 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS); 2497 } 2498 2499 if (intmask & SDHCI_INT_DATA_END) { 2500 if (host->cmd) { 2501 /* 2502 * Data managed to finish before the 2503 * command completed. Make sure we do 2504 * things in the proper order. 2505 */ 2506 host->data_early = 1; 2507 } else { 2508 sdhci_finish_data(host); 2509 } 2510 } 2511 } 2512 } 2513 2514 static irqreturn_t sdhci_irq(int irq, void *dev_id) 2515 { 2516 irqreturn_t result = IRQ_NONE; 2517 struct sdhci_host *host = dev_id; 2518 u32 intmask, mask, unexpected = 0; 2519 int max_loops = 16; 2520 2521 spin_lock(&host->lock); 2522 2523 if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) { 2524 spin_unlock(&host->lock); 2525 return IRQ_NONE; 2526 } 2527 2528 intmask = sdhci_readl(host, SDHCI_INT_STATUS); 2529 if (!intmask || intmask == 0xffffffff) { 2530 result = IRQ_NONE; 2531 goto out; 2532 } 2533 2534 do { 2535 /* Clear selected interrupts. */ 2536 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | 2537 SDHCI_INT_BUS_POWER); 2538 sdhci_writel(host, mask, SDHCI_INT_STATUS); 2539 2540 DBG("*** %s got interrupt: 0x%08x\n", 2541 mmc_hostname(host->mmc), intmask); 2542 2543 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { 2544 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 2545 SDHCI_CARD_PRESENT; 2546 2547 /* 2548 * There is a observation on i.mx esdhc. INSERT 2549 * bit will be immediately set again when it gets 2550 * cleared, if a card is inserted. We have to mask 2551 * the irq to prevent interrupt storm which will 2552 * freeze the system. And the REMOVE gets the 2553 * same situation. 2554 * 2555 * More testing are needed here to ensure it works 2556 * for other platforms though. 2557 */ 2558 host->ier &= ~(SDHCI_INT_CARD_INSERT | 2559 SDHCI_INT_CARD_REMOVE); 2560 host->ier |= present ? SDHCI_INT_CARD_REMOVE : 2561 SDHCI_INT_CARD_INSERT; 2562 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 2563 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 2564 2565 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT | 2566 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS); 2567 2568 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT | 2569 SDHCI_INT_CARD_REMOVE); 2570 result = IRQ_WAKE_THREAD; 2571 } 2572 2573 if (intmask & SDHCI_INT_CMD_MASK) 2574 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, 2575 &intmask); 2576 2577 if (intmask & SDHCI_INT_DATA_MASK) 2578 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK); 2579 2580 if (intmask & SDHCI_INT_BUS_POWER) 2581 pr_err("%s: Card is consuming too much power!\n", 2582 mmc_hostname(host->mmc)); 2583 2584 if (intmask & SDHCI_INT_CARD_INT) { 2585 sdhci_enable_sdio_irq_nolock(host, false); 2586 host->thread_isr |= SDHCI_INT_CARD_INT; 2587 result = IRQ_WAKE_THREAD; 2588 } 2589 2590 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE | 2591 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | 2592 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER | 2593 SDHCI_INT_CARD_INT); 2594 2595 if (intmask) { 2596 unexpected |= intmask; 2597 sdhci_writel(host, intmask, SDHCI_INT_STATUS); 2598 } 2599 2600 if (result == IRQ_NONE) 2601 result = IRQ_HANDLED; 2602 2603 intmask = sdhci_readl(host, SDHCI_INT_STATUS); 2604 } while (intmask && --max_loops); 2605 out: 2606 spin_unlock(&host->lock); 2607 2608 if (unexpected) { 2609 pr_err("%s: Unexpected interrupt 0x%08x.\n", 2610 mmc_hostname(host->mmc), unexpected); 2611 sdhci_dumpregs(host); 2612 } 2613 2614 return result; 2615 } 2616 2617 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id) 2618 { 2619 struct sdhci_host *host = dev_id; 2620 unsigned long flags; 2621 u32 isr; 2622 2623 spin_lock_irqsave(&host->lock, flags); 2624 isr = host->thread_isr; 2625 host->thread_isr = 0; 2626 spin_unlock_irqrestore(&host->lock, flags); 2627 2628 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { 2629 sdhci_card_event(host->mmc); 2630 mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 2631 } 2632 2633 if (isr & SDHCI_INT_CARD_INT) { 2634 sdio_run_irqs(host->mmc); 2635 2636 spin_lock_irqsave(&host->lock, flags); 2637 if (host->flags & SDHCI_SDIO_IRQ_ENABLED) 2638 sdhci_enable_sdio_irq_nolock(host, true); 2639 spin_unlock_irqrestore(&host->lock, flags); 2640 } 2641 2642 return isr ? IRQ_HANDLED : IRQ_NONE; 2643 } 2644 2645 /*****************************************************************************\ 2646 * * 2647 * Suspend/resume * 2648 * * 2649 \*****************************************************************************/ 2650 2651 #ifdef CONFIG_PM 2652 void sdhci_enable_irq_wakeups(struct sdhci_host *host) 2653 { 2654 u8 val; 2655 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE 2656 | SDHCI_WAKE_ON_INT; 2657 2658 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); 2659 val |= mask ; 2660 /* Avoid fake wake up */ 2661 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) 2662 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE); 2663 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); 2664 } 2665 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups); 2666 2667 static void sdhci_disable_irq_wakeups(struct sdhci_host *host) 2668 { 2669 u8 val; 2670 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE 2671 | SDHCI_WAKE_ON_INT; 2672 2673 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); 2674 val &= ~mask; 2675 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); 2676 } 2677 2678 int sdhci_suspend_host(struct sdhci_host *host) 2679 { 2680 sdhci_disable_card_detection(host); 2681 2682 mmc_retune_timer_stop(host->mmc); 2683 mmc_retune_needed(host->mmc); 2684 2685 if (!device_may_wakeup(mmc_dev(host->mmc))) { 2686 host->ier = 0; 2687 sdhci_writel(host, 0, SDHCI_INT_ENABLE); 2688 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 2689 free_irq(host->irq, host); 2690 } else { 2691 sdhci_enable_irq_wakeups(host); 2692 enable_irq_wake(host->irq); 2693 } 2694 return 0; 2695 } 2696 2697 EXPORT_SYMBOL_GPL(sdhci_suspend_host); 2698 2699 int sdhci_resume_host(struct sdhci_host *host) 2700 { 2701 int ret = 0; 2702 2703 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 2704 if (host->ops->enable_dma) 2705 host->ops->enable_dma(host); 2706 } 2707 2708 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) && 2709 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) { 2710 /* Card keeps power but host controller does not */ 2711 sdhci_init(host, 0); 2712 host->pwr = 0; 2713 host->clock = 0; 2714 sdhci_do_set_ios(host, &host->mmc->ios); 2715 } else { 2716 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER)); 2717 mmiowb(); 2718 } 2719 2720 if (!device_may_wakeup(mmc_dev(host->mmc))) { 2721 ret = request_threaded_irq(host->irq, sdhci_irq, 2722 sdhci_thread_irq, IRQF_SHARED, 2723 mmc_hostname(host->mmc), host); 2724 if (ret) 2725 return ret; 2726 } else { 2727 sdhci_disable_irq_wakeups(host); 2728 disable_irq_wake(host->irq); 2729 } 2730 2731 sdhci_enable_card_detection(host); 2732 2733 return ret; 2734 } 2735 2736 EXPORT_SYMBOL_GPL(sdhci_resume_host); 2737 2738 static int sdhci_runtime_pm_get(struct sdhci_host *host) 2739 { 2740 return pm_runtime_get_sync(host->mmc->parent); 2741 } 2742 2743 static int sdhci_runtime_pm_put(struct sdhci_host *host) 2744 { 2745 pm_runtime_mark_last_busy(host->mmc->parent); 2746 return pm_runtime_put_autosuspend(host->mmc->parent); 2747 } 2748 2749 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) 2750 { 2751 if (host->bus_on) 2752 return; 2753 host->bus_on = true; 2754 pm_runtime_get_noresume(host->mmc->parent); 2755 } 2756 2757 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) 2758 { 2759 if (!host->bus_on) 2760 return; 2761 host->bus_on = false; 2762 pm_runtime_put_noidle(host->mmc->parent); 2763 } 2764 2765 int sdhci_runtime_suspend_host(struct sdhci_host *host) 2766 { 2767 unsigned long flags; 2768 2769 mmc_retune_timer_stop(host->mmc); 2770 mmc_retune_needed(host->mmc); 2771 2772 spin_lock_irqsave(&host->lock, flags); 2773 host->ier &= SDHCI_INT_CARD_INT; 2774 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); 2775 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); 2776 spin_unlock_irqrestore(&host->lock, flags); 2777 2778 synchronize_hardirq(host->irq); 2779 2780 spin_lock_irqsave(&host->lock, flags); 2781 host->runtime_suspended = true; 2782 spin_unlock_irqrestore(&host->lock, flags); 2783 2784 return 0; 2785 } 2786 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host); 2787 2788 int sdhci_runtime_resume_host(struct sdhci_host *host) 2789 { 2790 unsigned long flags; 2791 int host_flags = host->flags; 2792 2793 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 2794 if (host->ops->enable_dma) 2795 host->ops->enable_dma(host); 2796 } 2797 2798 sdhci_init(host, 0); 2799 2800 /* Force clock and power re-program */ 2801 host->pwr = 0; 2802 host->clock = 0; 2803 sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios); 2804 sdhci_do_set_ios(host, &host->mmc->ios); 2805 2806 if ((host_flags & SDHCI_PV_ENABLED) && 2807 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) { 2808 spin_lock_irqsave(&host->lock, flags); 2809 sdhci_enable_preset_value(host, true); 2810 spin_unlock_irqrestore(&host->lock, flags); 2811 } 2812 2813 spin_lock_irqsave(&host->lock, flags); 2814 2815 host->runtime_suspended = false; 2816 2817 /* Enable SDIO IRQ */ 2818 if (host->flags & SDHCI_SDIO_IRQ_ENABLED) 2819 sdhci_enable_sdio_irq_nolock(host, true); 2820 2821 /* Enable Card Detection */ 2822 sdhci_enable_card_detection(host); 2823 2824 spin_unlock_irqrestore(&host->lock, flags); 2825 2826 return 0; 2827 } 2828 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host); 2829 2830 #endif /* CONFIG_PM */ 2831 2832 /*****************************************************************************\ 2833 * * 2834 * Device allocation/registration * 2835 * * 2836 \*****************************************************************************/ 2837 2838 struct sdhci_host *sdhci_alloc_host(struct device *dev, 2839 size_t priv_size) 2840 { 2841 struct mmc_host *mmc; 2842 struct sdhci_host *host; 2843 2844 WARN_ON(dev == NULL); 2845 2846 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev); 2847 if (!mmc) 2848 return ERR_PTR(-ENOMEM); 2849 2850 host = mmc_priv(mmc); 2851 host->mmc = mmc; 2852 host->mmc_host_ops = sdhci_ops; 2853 mmc->ops = &host->mmc_host_ops; 2854 2855 return host; 2856 } 2857 2858 EXPORT_SYMBOL_GPL(sdhci_alloc_host); 2859 2860 int sdhci_add_host(struct sdhci_host *host) 2861 { 2862 struct mmc_host *mmc; 2863 u32 caps[2] = {0, 0}; 2864 u32 max_current_caps; 2865 unsigned int ocr_avail; 2866 unsigned int override_timeout_clk; 2867 u32 max_clk; 2868 int ret; 2869 2870 WARN_ON(host == NULL); 2871 if (host == NULL) 2872 return -EINVAL; 2873 2874 mmc = host->mmc; 2875 2876 if (debug_quirks) 2877 host->quirks = debug_quirks; 2878 if (debug_quirks2) 2879 host->quirks2 = debug_quirks2; 2880 2881 override_timeout_clk = host->timeout_clk; 2882 2883 sdhci_do_reset(host, SDHCI_RESET_ALL); 2884 2885 host->version = sdhci_readw(host, SDHCI_HOST_VERSION); 2886 host->version = (host->version & SDHCI_SPEC_VER_MASK) 2887 >> SDHCI_SPEC_VER_SHIFT; 2888 if (host->version > SDHCI_SPEC_300) { 2889 pr_err("%s: Unknown controller version (%d). You may experience problems.\n", 2890 mmc_hostname(mmc), host->version); 2891 } 2892 2893 caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps : 2894 sdhci_readl(host, SDHCI_CAPABILITIES); 2895 2896 if (host->version >= SDHCI_SPEC_300) 2897 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? 2898 host->caps1 : 2899 sdhci_readl(host, SDHCI_CAPABILITIES_1); 2900 2901 if (host->quirks & SDHCI_QUIRK_FORCE_DMA) 2902 host->flags |= SDHCI_USE_SDMA; 2903 else if (!(caps[0] & SDHCI_CAN_DO_SDMA)) 2904 DBG("Controller doesn't have SDMA capability\n"); 2905 else 2906 host->flags |= SDHCI_USE_SDMA; 2907 2908 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) && 2909 (host->flags & SDHCI_USE_SDMA)) { 2910 DBG("Disabling DMA as it is marked broken\n"); 2911 host->flags &= ~SDHCI_USE_SDMA; 2912 } 2913 2914 if ((host->version >= SDHCI_SPEC_200) && 2915 (caps[0] & SDHCI_CAN_DO_ADMA2)) 2916 host->flags |= SDHCI_USE_ADMA; 2917 2918 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) && 2919 (host->flags & SDHCI_USE_ADMA)) { 2920 DBG("Disabling ADMA as it is marked broken\n"); 2921 host->flags &= ~SDHCI_USE_ADMA; 2922 } 2923 2924 /* 2925 * It is assumed that a 64-bit capable device has set a 64-bit DMA mask 2926 * and *must* do 64-bit DMA. A driver has the opportunity to change 2927 * that during the first call to ->enable_dma(). Similarly 2928 * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to 2929 * implement. 2930 */ 2931 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) 2932 host->flags |= SDHCI_USE_64_BIT_DMA; 2933 2934 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 2935 if (host->ops->enable_dma) { 2936 if (host->ops->enable_dma(host)) { 2937 pr_warn("%s: No suitable DMA available - falling back to PIO\n", 2938 mmc_hostname(mmc)); 2939 host->flags &= 2940 ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); 2941 } 2942 } 2943 } 2944 2945 /* SDMA does not support 64-bit DMA */ 2946 if (host->flags & SDHCI_USE_64_BIT_DMA) 2947 host->flags &= ~SDHCI_USE_SDMA; 2948 2949 if (host->flags & SDHCI_USE_ADMA) { 2950 /* 2951 * The DMA descriptor table size is calculated as the maximum 2952 * number of segments times 2, to allow for an alignment 2953 * descriptor for each segment, plus 1 for a nop end descriptor, 2954 * all multipled by the descriptor size. 2955 */ 2956 if (host->flags & SDHCI_USE_64_BIT_DMA) { 2957 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * 2958 SDHCI_ADMA2_64_DESC_SZ; 2959 host->desc_sz = SDHCI_ADMA2_64_DESC_SZ; 2960 } else { 2961 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * 2962 SDHCI_ADMA2_32_DESC_SZ; 2963 host->desc_sz = SDHCI_ADMA2_32_DESC_SZ; 2964 } 2965 host->adma_table = dma_alloc_coherent(mmc_dev(mmc), 2966 host->adma_table_sz, 2967 &host->adma_addr, 2968 GFP_KERNEL); 2969 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN; 2970 host->align_buffer = kmalloc(host->align_buffer_sz, GFP_KERNEL); 2971 if (!host->adma_table || !host->align_buffer) { 2972 if (host->adma_table) 2973 dma_free_coherent(mmc_dev(mmc), 2974 host->adma_table_sz, 2975 host->adma_table, 2976 host->adma_addr); 2977 kfree(host->align_buffer); 2978 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n", 2979 mmc_hostname(mmc)); 2980 host->flags &= ~SDHCI_USE_ADMA; 2981 host->adma_table = NULL; 2982 host->align_buffer = NULL; 2983 } else if (host->adma_addr & (SDHCI_ADMA2_DESC_ALIGN - 1)) { 2984 pr_warn("%s: unable to allocate aligned ADMA descriptor\n", 2985 mmc_hostname(mmc)); 2986 host->flags &= ~SDHCI_USE_ADMA; 2987 dma_free_coherent(mmc_dev(mmc), host->adma_table_sz, 2988 host->adma_table, host->adma_addr); 2989 kfree(host->align_buffer); 2990 host->adma_table = NULL; 2991 host->align_buffer = NULL; 2992 } 2993 } 2994 2995 /* 2996 * If we use DMA, then it's up to the caller to set the DMA 2997 * mask, but PIO does not need the hw shim so we set a new 2998 * mask here in that case. 2999 */ 3000 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) { 3001 host->dma_mask = DMA_BIT_MASK(64); 3002 mmc_dev(mmc)->dma_mask = &host->dma_mask; 3003 } 3004 3005 if (host->version >= SDHCI_SPEC_300) 3006 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK) 3007 >> SDHCI_CLOCK_BASE_SHIFT; 3008 else 3009 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK) 3010 >> SDHCI_CLOCK_BASE_SHIFT; 3011 3012 host->max_clk *= 1000000; 3013 if (host->max_clk == 0 || host->quirks & 3014 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) { 3015 if (!host->ops->get_max_clock) { 3016 pr_err("%s: Hardware doesn't specify base clock frequency.\n", 3017 mmc_hostname(mmc)); 3018 return -ENODEV; 3019 } 3020 host->max_clk = host->ops->get_max_clock(host); 3021 } 3022 3023 /* 3024 * In case of Host Controller v3.00, find out whether clock 3025 * multiplier is supported. 3026 */ 3027 host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >> 3028 SDHCI_CLOCK_MUL_SHIFT; 3029 3030 /* 3031 * In case the value in Clock Multiplier is 0, then programmable 3032 * clock mode is not supported, otherwise the actual clock 3033 * multiplier is one more than the value of Clock Multiplier 3034 * in the Capabilities Register. 3035 */ 3036 if (host->clk_mul) 3037 host->clk_mul += 1; 3038 3039 /* 3040 * Set host parameters. 3041 */ 3042 max_clk = host->max_clk; 3043 3044 if (host->ops->get_min_clock) 3045 mmc->f_min = host->ops->get_min_clock(host); 3046 else if (host->version >= SDHCI_SPEC_300) { 3047 if (host->clk_mul) { 3048 mmc->f_min = (host->max_clk * host->clk_mul) / 1024; 3049 max_clk = host->max_clk * host->clk_mul; 3050 } else 3051 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300; 3052 } else 3053 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200; 3054 3055 if (!mmc->f_max || (mmc->f_max && (mmc->f_max > max_clk))) 3056 mmc->f_max = max_clk; 3057 3058 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) { 3059 host->timeout_clk = (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> 3060 SDHCI_TIMEOUT_CLK_SHIFT; 3061 if (host->timeout_clk == 0) { 3062 if (host->ops->get_timeout_clock) { 3063 host->timeout_clk = 3064 host->ops->get_timeout_clock(host); 3065 } else { 3066 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n", 3067 mmc_hostname(mmc)); 3068 return -ENODEV; 3069 } 3070 } 3071 3072 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT) 3073 host->timeout_clk *= 1000; 3074 3075 mmc->max_busy_timeout = host->ops->get_max_timeout_count ? 3076 host->ops->get_max_timeout_count(host) : 1 << 27; 3077 mmc->max_busy_timeout /= host->timeout_clk; 3078 } 3079 3080 if (override_timeout_clk) 3081 host->timeout_clk = override_timeout_clk; 3082 3083 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23; 3084 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD; 3085 3086 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) 3087 host->flags |= SDHCI_AUTO_CMD12; 3088 3089 /* Auto-CMD23 stuff only works in ADMA or PIO. */ 3090 if ((host->version >= SDHCI_SPEC_300) && 3091 ((host->flags & SDHCI_USE_ADMA) || 3092 !(host->flags & SDHCI_USE_SDMA)) && 3093 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) { 3094 host->flags |= SDHCI_AUTO_CMD23; 3095 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc)); 3096 } else { 3097 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc)); 3098 } 3099 3100 /* 3101 * A controller may support 8-bit width, but the board itself 3102 * might not have the pins brought out. Boards that support 3103 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in 3104 * their platform code before calling sdhci_add_host(), and we 3105 * won't assume 8-bit width for hosts without that CAP. 3106 */ 3107 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) 3108 mmc->caps |= MMC_CAP_4_BIT_DATA; 3109 3110 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23) 3111 mmc->caps &= ~MMC_CAP_CMD23; 3112 3113 if (caps[0] & SDHCI_CAN_DO_HISPD) 3114 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; 3115 3116 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && 3117 !(mmc->caps & MMC_CAP_NONREMOVABLE) && 3118 IS_ERR_VALUE(mmc_gpio_get_cd(host->mmc))) 3119 mmc->caps |= MMC_CAP_NEEDS_POLL; 3120 3121 /* If there are external regulators, get them */ 3122 if (mmc_regulator_get_supply(mmc) == -EPROBE_DEFER) 3123 return -EPROBE_DEFER; 3124 3125 /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */ 3126 if (!IS_ERR(mmc->supply.vqmmc)) { 3127 ret = regulator_enable(mmc->supply.vqmmc); 3128 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000, 3129 1950000)) 3130 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | 3131 SDHCI_SUPPORT_SDR50 | 3132 SDHCI_SUPPORT_DDR50); 3133 if (ret) { 3134 pr_warn("%s: Failed to enable vqmmc regulator: %d\n", 3135 mmc_hostname(mmc), ret); 3136 mmc->supply.vqmmc = ERR_PTR(-EINVAL); 3137 } 3138 } 3139 3140 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) 3141 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | 3142 SDHCI_SUPPORT_DDR50); 3143 3144 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */ 3145 if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | 3146 SDHCI_SUPPORT_DDR50)) 3147 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25; 3148 3149 /* SDR104 supports also implies SDR50 support */ 3150 if (caps[1] & SDHCI_SUPPORT_SDR104) { 3151 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50; 3152 /* SD3.0: SDR104 is supported so (for eMMC) the caps2 3153 * field can be promoted to support HS200. 3154 */ 3155 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200)) 3156 mmc->caps2 |= MMC_CAP2_HS200; 3157 } else if (caps[1] & SDHCI_SUPPORT_SDR50) 3158 mmc->caps |= MMC_CAP_UHS_SDR50; 3159 3160 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 && 3161 (caps[1] & SDHCI_SUPPORT_HS400)) 3162 mmc->caps2 |= MMC_CAP2_HS400; 3163 3164 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) && 3165 (IS_ERR(mmc->supply.vqmmc) || 3166 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000, 3167 1300000))) 3168 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V; 3169 3170 if ((caps[1] & SDHCI_SUPPORT_DDR50) && 3171 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50)) 3172 mmc->caps |= MMC_CAP_UHS_DDR50; 3173 3174 /* Does the host need tuning for SDR50? */ 3175 if (caps[1] & SDHCI_USE_SDR50_TUNING) 3176 host->flags |= SDHCI_SDR50_NEEDS_TUNING; 3177 3178 /* Does the host need tuning for SDR104 / HS200? */ 3179 if (mmc->caps2 & MMC_CAP2_HS200) 3180 host->flags |= SDHCI_SDR104_NEEDS_TUNING; 3181 3182 /* Driver Type(s) (A, C, D) supported by the host */ 3183 if (caps[1] & SDHCI_DRIVER_TYPE_A) 3184 mmc->caps |= MMC_CAP_DRIVER_TYPE_A; 3185 if (caps[1] & SDHCI_DRIVER_TYPE_C) 3186 mmc->caps |= MMC_CAP_DRIVER_TYPE_C; 3187 if (caps[1] & SDHCI_DRIVER_TYPE_D) 3188 mmc->caps |= MMC_CAP_DRIVER_TYPE_D; 3189 3190 /* Initial value for re-tuning timer count */ 3191 host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >> 3192 SDHCI_RETUNING_TIMER_COUNT_SHIFT; 3193 3194 /* 3195 * In case Re-tuning Timer is not disabled, the actual value of 3196 * re-tuning timer will be 2 ^ (n - 1). 3197 */ 3198 if (host->tuning_count) 3199 host->tuning_count = 1 << (host->tuning_count - 1); 3200 3201 /* Re-tuning mode supported by the Host Controller */ 3202 host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >> 3203 SDHCI_RETUNING_MODE_SHIFT; 3204 3205 ocr_avail = 0; 3206 3207 /* 3208 * According to SD Host Controller spec v3.00, if the Host System 3209 * can afford more than 150mA, Host Driver should set XPC to 1. Also 3210 * the value is meaningful only if Voltage Support in the Capabilities 3211 * register is set. The actual current value is 4 times the register 3212 * value. 3213 */ 3214 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT); 3215 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) { 3216 int curr = regulator_get_current_limit(mmc->supply.vmmc); 3217 if (curr > 0) { 3218 3219 /* convert to SDHCI_MAX_CURRENT format */ 3220 curr = curr/1000; /* convert to mA */ 3221 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER; 3222 3223 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT); 3224 max_current_caps = 3225 (curr << SDHCI_MAX_CURRENT_330_SHIFT) | 3226 (curr << SDHCI_MAX_CURRENT_300_SHIFT) | 3227 (curr << SDHCI_MAX_CURRENT_180_SHIFT); 3228 } 3229 } 3230 3231 if (caps[0] & SDHCI_CAN_VDD_330) { 3232 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34; 3233 3234 mmc->max_current_330 = ((max_current_caps & 3235 SDHCI_MAX_CURRENT_330_MASK) >> 3236 SDHCI_MAX_CURRENT_330_SHIFT) * 3237 SDHCI_MAX_CURRENT_MULTIPLIER; 3238 } 3239 if (caps[0] & SDHCI_CAN_VDD_300) { 3240 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31; 3241 3242 mmc->max_current_300 = ((max_current_caps & 3243 SDHCI_MAX_CURRENT_300_MASK) >> 3244 SDHCI_MAX_CURRENT_300_SHIFT) * 3245 SDHCI_MAX_CURRENT_MULTIPLIER; 3246 } 3247 if (caps[0] & SDHCI_CAN_VDD_180) { 3248 ocr_avail |= MMC_VDD_165_195; 3249 3250 mmc->max_current_180 = ((max_current_caps & 3251 SDHCI_MAX_CURRENT_180_MASK) >> 3252 SDHCI_MAX_CURRENT_180_SHIFT) * 3253 SDHCI_MAX_CURRENT_MULTIPLIER; 3254 } 3255 3256 /* If OCR set by host, use it instead. */ 3257 if (host->ocr_mask) 3258 ocr_avail = host->ocr_mask; 3259 3260 /* If OCR set by external regulators, give it highest prio. */ 3261 if (mmc->ocr_avail) 3262 ocr_avail = mmc->ocr_avail; 3263 3264 mmc->ocr_avail = ocr_avail; 3265 mmc->ocr_avail_sdio = ocr_avail; 3266 if (host->ocr_avail_sdio) 3267 mmc->ocr_avail_sdio &= host->ocr_avail_sdio; 3268 mmc->ocr_avail_sd = ocr_avail; 3269 if (host->ocr_avail_sd) 3270 mmc->ocr_avail_sd &= host->ocr_avail_sd; 3271 else /* normal SD controllers don't support 1.8V */ 3272 mmc->ocr_avail_sd &= ~MMC_VDD_165_195; 3273 mmc->ocr_avail_mmc = ocr_avail; 3274 if (host->ocr_avail_mmc) 3275 mmc->ocr_avail_mmc &= host->ocr_avail_mmc; 3276 3277 if (mmc->ocr_avail == 0) { 3278 pr_err("%s: Hardware doesn't report any support voltages.\n", 3279 mmc_hostname(mmc)); 3280 return -ENODEV; 3281 } 3282 3283 spin_lock_init(&host->lock); 3284 3285 /* 3286 * Maximum number of segments. Depends on if the hardware 3287 * can do scatter/gather or not. 3288 */ 3289 if (host->flags & SDHCI_USE_ADMA) 3290 mmc->max_segs = SDHCI_MAX_SEGS; 3291 else if (host->flags & SDHCI_USE_SDMA) 3292 mmc->max_segs = 1; 3293 else /* PIO */ 3294 mmc->max_segs = SDHCI_MAX_SEGS; 3295 3296 /* 3297 * Maximum number of sectors in one transfer. Limited by SDMA boundary 3298 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this 3299 * is less anyway. 3300 */ 3301 mmc->max_req_size = 524288; 3302 3303 /* 3304 * Maximum segment size. Could be one segment with the maximum number 3305 * of bytes. When doing hardware scatter/gather, each entry cannot 3306 * be larger than 64 KiB though. 3307 */ 3308 if (host->flags & SDHCI_USE_ADMA) { 3309 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC) 3310 mmc->max_seg_size = 65535; 3311 else 3312 mmc->max_seg_size = 65536; 3313 } else { 3314 mmc->max_seg_size = mmc->max_req_size; 3315 } 3316 3317 /* 3318 * Maximum block size. This varies from controller to controller and 3319 * is specified in the capabilities register. 3320 */ 3321 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) { 3322 mmc->max_blk_size = 2; 3323 } else { 3324 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >> 3325 SDHCI_MAX_BLOCK_SHIFT; 3326 if (mmc->max_blk_size >= 3) { 3327 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n", 3328 mmc_hostname(mmc)); 3329 mmc->max_blk_size = 0; 3330 } 3331 } 3332 3333 mmc->max_blk_size = 512 << mmc->max_blk_size; 3334 3335 /* 3336 * Maximum block count. 3337 */ 3338 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535; 3339 3340 /* 3341 * Init tasklets. 3342 */ 3343 tasklet_init(&host->finish_tasklet, 3344 sdhci_tasklet_finish, (unsigned long)host); 3345 3346 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host); 3347 3348 init_waitqueue_head(&host->buf_ready_int); 3349 3350 sdhci_init(host, 0); 3351 3352 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq, 3353 IRQF_SHARED, mmc_hostname(mmc), host); 3354 if (ret) { 3355 pr_err("%s: Failed to request IRQ %d: %d\n", 3356 mmc_hostname(mmc), host->irq, ret); 3357 goto untasklet; 3358 } 3359 3360 #ifdef CONFIG_MMC_DEBUG 3361 sdhci_dumpregs(host); 3362 #endif 3363 3364 #ifdef SDHCI_USE_LEDS_CLASS 3365 snprintf(host->led_name, sizeof(host->led_name), 3366 "%s::", mmc_hostname(mmc)); 3367 host->led.name = host->led_name; 3368 host->led.brightness = LED_OFF; 3369 host->led.default_trigger = mmc_hostname(mmc); 3370 host->led.brightness_set = sdhci_led_control; 3371 3372 ret = led_classdev_register(mmc_dev(mmc), &host->led); 3373 if (ret) { 3374 pr_err("%s: Failed to register LED device: %d\n", 3375 mmc_hostname(mmc), ret); 3376 goto reset; 3377 } 3378 #endif 3379 3380 mmiowb(); 3381 3382 mmc_add_host(mmc); 3383 3384 pr_info("%s: SDHCI controller on %s [%s] using %s\n", 3385 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)), 3386 (host->flags & SDHCI_USE_ADMA) ? 3387 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" : 3388 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO"); 3389 3390 sdhci_enable_card_detection(host); 3391 3392 return 0; 3393 3394 #ifdef SDHCI_USE_LEDS_CLASS 3395 reset: 3396 sdhci_do_reset(host, SDHCI_RESET_ALL); 3397 sdhci_writel(host, 0, SDHCI_INT_ENABLE); 3398 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 3399 free_irq(host->irq, host); 3400 #endif 3401 untasklet: 3402 tasklet_kill(&host->finish_tasklet); 3403 3404 return ret; 3405 } 3406 3407 EXPORT_SYMBOL_GPL(sdhci_add_host); 3408 3409 void sdhci_remove_host(struct sdhci_host *host, int dead) 3410 { 3411 struct mmc_host *mmc = host->mmc; 3412 unsigned long flags; 3413 3414 if (dead) { 3415 spin_lock_irqsave(&host->lock, flags); 3416 3417 host->flags |= SDHCI_DEVICE_DEAD; 3418 3419 if (host->mrq) { 3420 pr_err("%s: Controller removed during " 3421 " transfer!\n", mmc_hostname(mmc)); 3422 3423 host->mrq->cmd->error = -ENOMEDIUM; 3424 tasklet_schedule(&host->finish_tasklet); 3425 } 3426 3427 spin_unlock_irqrestore(&host->lock, flags); 3428 } 3429 3430 sdhci_disable_card_detection(host); 3431 3432 mmc_remove_host(mmc); 3433 3434 #ifdef SDHCI_USE_LEDS_CLASS 3435 led_classdev_unregister(&host->led); 3436 #endif 3437 3438 if (!dead) 3439 sdhci_do_reset(host, SDHCI_RESET_ALL); 3440 3441 sdhci_writel(host, 0, SDHCI_INT_ENABLE); 3442 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 3443 free_irq(host->irq, host); 3444 3445 del_timer_sync(&host->timer); 3446 3447 tasklet_kill(&host->finish_tasklet); 3448 3449 if (!IS_ERR(mmc->supply.vqmmc)) 3450 regulator_disable(mmc->supply.vqmmc); 3451 3452 if (host->adma_table) 3453 dma_free_coherent(mmc_dev(mmc), host->adma_table_sz, 3454 host->adma_table, host->adma_addr); 3455 kfree(host->align_buffer); 3456 3457 host->adma_table = NULL; 3458 host->align_buffer = NULL; 3459 } 3460 3461 EXPORT_SYMBOL_GPL(sdhci_remove_host); 3462 3463 void sdhci_free_host(struct sdhci_host *host) 3464 { 3465 mmc_free_host(host->mmc); 3466 } 3467 3468 EXPORT_SYMBOL_GPL(sdhci_free_host); 3469 3470 /*****************************************************************************\ 3471 * * 3472 * Driver init/exit * 3473 * * 3474 \*****************************************************************************/ 3475 3476 static int __init sdhci_drv_init(void) 3477 { 3478 pr_info(DRIVER_NAME 3479 ": Secure Digital Host Controller Interface driver\n"); 3480 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 3481 3482 return 0; 3483 } 3484 3485 static void __exit sdhci_drv_exit(void) 3486 { 3487 } 3488 3489 module_init(sdhci_drv_init); 3490 module_exit(sdhci_drv_exit); 3491 3492 module_param(debug_quirks, uint, 0444); 3493 module_param(debug_quirks2, uint, 0444); 3494 3495 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 3496 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver"); 3497 MODULE_LICENSE("GPL"); 3498 3499 MODULE_PARM_DESC(debug_quirks, "Force certain quirks."); 3500 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks."); 3501