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/slot-gpio.h> 32 33 #include "sdhci.h" 34 35 #define DRIVER_NAME "sdhci" 36 37 #define DBG(f, x...) \ 38 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x) 39 40 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \ 41 defined(CONFIG_MMC_SDHCI_MODULE)) 42 #define SDHCI_USE_LEDS_CLASS 43 #endif 44 45 #define MAX_TUNING_LOOP 40 46 47 static unsigned int debug_quirks = 0; 48 static unsigned int debug_quirks2; 49 50 static void sdhci_finish_data(struct sdhci_host *); 51 52 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *); 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_tuning_timer(unsigned long data); 56 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable); 57 58 #ifdef CONFIG_PM_RUNTIME 59 static int sdhci_runtime_pm_get(struct sdhci_host *host); 60 static int sdhci_runtime_pm_put(struct sdhci_host *host); 61 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host); 62 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host); 63 #else 64 static inline int sdhci_runtime_pm_get(struct sdhci_host *host) 65 { 66 return 0; 67 } 68 static inline int sdhci_runtime_pm_put(struct sdhci_host *host) 69 { 70 return 0; 71 } 72 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) 73 { 74 } 75 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) 76 { 77 } 78 #endif 79 80 static void sdhci_dumpregs(struct sdhci_host *host) 81 { 82 pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n", 83 mmc_hostname(host->mmc)); 84 85 pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n", 86 sdhci_readl(host, SDHCI_DMA_ADDRESS), 87 sdhci_readw(host, SDHCI_HOST_VERSION)); 88 pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n", 89 sdhci_readw(host, SDHCI_BLOCK_SIZE), 90 sdhci_readw(host, SDHCI_BLOCK_COUNT)); 91 pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n", 92 sdhci_readl(host, SDHCI_ARGUMENT), 93 sdhci_readw(host, SDHCI_TRANSFER_MODE)); 94 pr_debug(DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n", 95 sdhci_readl(host, SDHCI_PRESENT_STATE), 96 sdhci_readb(host, SDHCI_HOST_CONTROL)); 97 pr_debug(DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n", 98 sdhci_readb(host, SDHCI_POWER_CONTROL), 99 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL)); 100 pr_debug(DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n", 101 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL), 102 sdhci_readw(host, SDHCI_CLOCK_CONTROL)); 103 pr_debug(DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n", 104 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL), 105 sdhci_readl(host, SDHCI_INT_STATUS)); 106 pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n", 107 sdhci_readl(host, SDHCI_INT_ENABLE), 108 sdhci_readl(host, SDHCI_SIGNAL_ENABLE)); 109 pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n", 110 sdhci_readw(host, SDHCI_ACMD12_ERR), 111 sdhci_readw(host, SDHCI_SLOT_INT_STATUS)); 112 pr_debug(DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n", 113 sdhci_readl(host, SDHCI_CAPABILITIES), 114 sdhci_readl(host, SDHCI_CAPABILITIES_1)); 115 pr_debug(DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n", 116 sdhci_readw(host, SDHCI_COMMAND), 117 sdhci_readl(host, SDHCI_MAX_CURRENT)); 118 pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n", 119 sdhci_readw(host, SDHCI_HOST_CONTROL2)); 120 121 if (host->flags & SDHCI_USE_ADMA) 122 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n", 123 readl(host->ioaddr + SDHCI_ADMA_ERROR), 124 readl(host->ioaddr + SDHCI_ADMA_ADDRESS)); 125 126 pr_debug(DRIVER_NAME ": ===========================================\n"); 127 } 128 129 /*****************************************************************************\ 130 * * 131 * Low level functions * 132 * * 133 \*****************************************************************************/ 134 135 static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set) 136 { 137 u32 ier; 138 139 ier = sdhci_readl(host, SDHCI_INT_ENABLE); 140 ier &= ~clear; 141 ier |= set; 142 sdhci_writel(host, ier, SDHCI_INT_ENABLE); 143 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE); 144 } 145 146 static void sdhci_unmask_irqs(struct sdhci_host *host, u32 irqs) 147 { 148 sdhci_clear_set_irqs(host, 0, irqs); 149 } 150 151 static void sdhci_mask_irqs(struct sdhci_host *host, u32 irqs) 152 { 153 sdhci_clear_set_irqs(host, irqs, 0); 154 } 155 156 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable) 157 { 158 u32 present, irqs; 159 160 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) || 161 (host->mmc->caps & MMC_CAP_NONREMOVABLE)) 162 return; 163 164 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 165 SDHCI_CARD_PRESENT; 166 irqs = present ? SDHCI_INT_CARD_REMOVE : SDHCI_INT_CARD_INSERT; 167 168 if (enable) 169 sdhci_unmask_irqs(host, irqs); 170 else 171 sdhci_mask_irqs(host, irqs); 172 } 173 174 static void sdhci_enable_card_detection(struct sdhci_host *host) 175 { 176 sdhci_set_card_detection(host, true); 177 } 178 179 static void sdhci_disable_card_detection(struct sdhci_host *host) 180 { 181 sdhci_set_card_detection(host, false); 182 } 183 184 static void sdhci_reset(struct sdhci_host *host, u8 mask) 185 { 186 unsigned long timeout; 187 u32 uninitialized_var(ier); 188 189 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) { 190 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & 191 SDHCI_CARD_PRESENT)) 192 return; 193 } 194 195 if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET) 196 ier = sdhci_readl(host, SDHCI_INT_ENABLE); 197 198 if (host->ops->platform_reset_enter) 199 host->ops->platform_reset_enter(host, mask); 200 201 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET); 202 203 if (mask & SDHCI_RESET_ALL) { 204 host->clock = 0; 205 /* Reset-all turns off SD Bus Power */ 206 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 207 sdhci_runtime_pm_bus_off(host); 208 } 209 210 /* Wait max 100 ms */ 211 timeout = 100; 212 213 /* hw clears the bit when it's done */ 214 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) { 215 if (timeout == 0) { 216 pr_err("%s: Reset 0x%x never completed.\n", 217 mmc_hostname(host->mmc), (int)mask); 218 sdhci_dumpregs(host); 219 return; 220 } 221 timeout--; 222 mdelay(1); 223 } 224 225 if (host->ops->platform_reset_exit) 226 host->ops->platform_reset_exit(host, mask); 227 228 if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET) 229 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier); 230 231 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 232 if ((host->ops->enable_dma) && (mask & SDHCI_RESET_ALL)) 233 host->ops->enable_dma(host); 234 } 235 } 236 237 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); 238 239 static void sdhci_init(struct sdhci_host *host, int soft) 240 { 241 if (soft) 242 sdhci_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA); 243 else 244 sdhci_reset(host, SDHCI_RESET_ALL); 245 246 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, 247 SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT | 248 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX | 249 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT | 250 SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE); 251 252 if (soft) { 253 /* force clock reconfiguration */ 254 host->clock = 0; 255 sdhci_set_ios(host->mmc, &host->mmc->ios); 256 } 257 } 258 259 static void sdhci_reinit(struct sdhci_host *host) 260 { 261 sdhci_init(host, 0); 262 /* 263 * Retuning stuffs are affected by different cards inserted and only 264 * applicable to UHS-I cards. So reset these fields to their initial 265 * value when card is removed. 266 */ 267 if (host->flags & SDHCI_USING_RETUNING_TIMER) { 268 host->flags &= ~SDHCI_USING_RETUNING_TIMER; 269 270 del_timer_sync(&host->tuning_timer); 271 host->flags &= ~SDHCI_NEEDS_RETUNING; 272 host->mmc->max_blk_count = 273 (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535; 274 } 275 sdhci_enable_card_detection(host); 276 } 277 278 static void sdhci_activate_led(struct sdhci_host *host) 279 { 280 u8 ctrl; 281 282 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 283 ctrl |= SDHCI_CTRL_LED; 284 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 285 } 286 287 static void sdhci_deactivate_led(struct sdhci_host *host) 288 { 289 u8 ctrl; 290 291 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 292 ctrl &= ~SDHCI_CTRL_LED; 293 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 294 } 295 296 #ifdef SDHCI_USE_LEDS_CLASS 297 static void sdhci_led_control(struct led_classdev *led, 298 enum led_brightness brightness) 299 { 300 struct sdhci_host *host = container_of(led, struct sdhci_host, led); 301 unsigned long flags; 302 303 spin_lock_irqsave(&host->lock, flags); 304 305 if (host->runtime_suspended) 306 goto out; 307 308 if (brightness == LED_OFF) 309 sdhci_deactivate_led(host); 310 else 311 sdhci_activate_led(host); 312 out: 313 spin_unlock_irqrestore(&host->lock, flags); 314 } 315 #endif 316 317 /*****************************************************************************\ 318 * * 319 * Core functions * 320 * * 321 \*****************************************************************************/ 322 323 static void sdhci_read_block_pio(struct sdhci_host *host) 324 { 325 unsigned long flags; 326 size_t blksize, len, chunk; 327 u32 uninitialized_var(scratch); 328 u8 *buf; 329 330 DBG("PIO reading\n"); 331 332 blksize = host->data->blksz; 333 chunk = 0; 334 335 local_irq_save(flags); 336 337 while (blksize) { 338 if (!sg_miter_next(&host->sg_miter)) 339 BUG(); 340 341 len = min(host->sg_miter.length, blksize); 342 343 blksize -= len; 344 host->sg_miter.consumed = len; 345 346 buf = host->sg_miter.addr; 347 348 while (len) { 349 if (chunk == 0) { 350 scratch = sdhci_readl(host, SDHCI_BUFFER); 351 chunk = 4; 352 } 353 354 *buf = scratch & 0xFF; 355 356 buf++; 357 scratch >>= 8; 358 chunk--; 359 len--; 360 } 361 } 362 363 sg_miter_stop(&host->sg_miter); 364 365 local_irq_restore(flags); 366 } 367 368 static void sdhci_write_block_pio(struct sdhci_host *host) 369 { 370 unsigned long flags; 371 size_t blksize, len, chunk; 372 u32 scratch; 373 u8 *buf; 374 375 DBG("PIO writing\n"); 376 377 blksize = host->data->blksz; 378 chunk = 0; 379 scratch = 0; 380 381 local_irq_save(flags); 382 383 while (blksize) { 384 if (!sg_miter_next(&host->sg_miter)) 385 BUG(); 386 387 len = min(host->sg_miter.length, blksize); 388 389 blksize -= len; 390 host->sg_miter.consumed = len; 391 392 buf = host->sg_miter.addr; 393 394 while (len) { 395 scratch |= (u32)*buf << (chunk * 8); 396 397 buf++; 398 chunk++; 399 len--; 400 401 if ((chunk == 4) || ((len == 0) && (blksize == 0))) { 402 sdhci_writel(host, scratch, SDHCI_BUFFER); 403 chunk = 0; 404 scratch = 0; 405 } 406 } 407 } 408 409 sg_miter_stop(&host->sg_miter); 410 411 local_irq_restore(flags); 412 } 413 414 static void sdhci_transfer_pio(struct sdhci_host *host) 415 { 416 u32 mask; 417 418 BUG_ON(!host->data); 419 420 if (host->blocks == 0) 421 return; 422 423 if (host->data->flags & MMC_DATA_READ) 424 mask = SDHCI_DATA_AVAILABLE; 425 else 426 mask = SDHCI_SPACE_AVAILABLE; 427 428 /* 429 * Some controllers (JMicron JMB38x) mess up the buffer bits 430 * for transfers < 4 bytes. As long as it is just one block, 431 * we can ignore the bits. 432 */ 433 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) && 434 (host->data->blocks == 1)) 435 mask = ~0; 436 437 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { 438 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY) 439 udelay(100); 440 441 if (host->data->flags & MMC_DATA_READ) 442 sdhci_read_block_pio(host); 443 else 444 sdhci_write_block_pio(host); 445 446 host->blocks--; 447 if (host->blocks == 0) 448 break; 449 } 450 451 DBG("PIO transfer complete.\n"); 452 } 453 454 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags) 455 { 456 local_irq_save(*flags); 457 return kmap_atomic(sg_page(sg)) + sg->offset; 458 } 459 460 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags) 461 { 462 kunmap_atomic(buffer); 463 local_irq_restore(*flags); 464 } 465 466 static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd) 467 { 468 __le32 *dataddr = (__le32 __force *)(desc + 4); 469 __le16 *cmdlen = (__le16 __force *)desc; 470 471 /* SDHCI specification says ADMA descriptors should be 4 byte 472 * aligned, so using 16 or 32bit operations should be safe. */ 473 474 cmdlen[0] = cpu_to_le16(cmd); 475 cmdlen[1] = cpu_to_le16(len); 476 477 dataddr[0] = cpu_to_le32(addr); 478 } 479 480 static int sdhci_adma_table_pre(struct sdhci_host *host, 481 struct mmc_data *data) 482 { 483 int direction; 484 485 u8 *desc; 486 u8 *align; 487 dma_addr_t addr; 488 dma_addr_t align_addr; 489 int len, offset; 490 491 struct scatterlist *sg; 492 int i; 493 char *buffer; 494 unsigned long flags; 495 496 /* 497 * The spec does not specify endianness of descriptor table. 498 * We currently guess that it is LE. 499 */ 500 501 if (data->flags & MMC_DATA_READ) 502 direction = DMA_FROM_DEVICE; 503 else 504 direction = DMA_TO_DEVICE; 505 506 /* 507 * The ADMA descriptor table is mapped further down as we 508 * need to fill it with data first. 509 */ 510 511 host->align_addr = dma_map_single(mmc_dev(host->mmc), 512 host->align_buffer, 128 * 4, direction); 513 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr)) 514 goto fail; 515 BUG_ON(host->align_addr & 0x3); 516 517 host->sg_count = dma_map_sg(mmc_dev(host->mmc), 518 data->sg, data->sg_len, direction); 519 if (host->sg_count == 0) 520 goto unmap_align; 521 522 desc = host->adma_desc; 523 align = host->align_buffer; 524 525 align_addr = host->align_addr; 526 527 for_each_sg(data->sg, sg, host->sg_count, i) { 528 addr = sg_dma_address(sg); 529 len = sg_dma_len(sg); 530 531 /* 532 * The SDHCI specification states that ADMA 533 * addresses must be 32-bit aligned. If they 534 * aren't, then we use a bounce buffer for 535 * the (up to three) bytes that screw up the 536 * alignment. 537 */ 538 offset = (4 - (addr & 0x3)) & 0x3; 539 if (offset) { 540 if (data->flags & MMC_DATA_WRITE) { 541 buffer = sdhci_kmap_atomic(sg, &flags); 542 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3)); 543 memcpy(align, buffer, offset); 544 sdhci_kunmap_atomic(buffer, &flags); 545 } 546 547 /* tran, valid */ 548 sdhci_set_adma_desc(desc, align_addr, offset, 0x21); 549 550 BUG_ON(offset > 65536); 551 552 align += 4; 553 align_addr += 4; 554 555 desc += 8; 556 557 addr += offset; 558 len -= offset; 559 } 560 561 BUG_ON(len > 65536); 562 563 /* tran, valid */ 564 sdhci_set_adma_desc(desc, addr, len, 0x21); 565 desc += 8; 566 567 /* 568 * If this triggers then we have a calculation bug 569 * somewhere. :/ 570 */ 571 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4); 572 } 573 574 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) { 575 /* 576 * Mark the last descriptor as the terminating descriptor 577 */ 578 if (desc != host->adma_desc) { 579 desc -= 8; 580 desc[0] |= 0x2; /* end */ 581 } 582 } else { 583 /* 584 * Add a terminating entry. 585 */ 586 587 /* nop, end, valid */ 588 sdhci_set_adma_desc(desc, 0, 0, 0x3); 589 } 590 591 /* 592 * Resync align buffer as we might have changed it. 593 */ 594 if (data->flags & MMC_DATA_WRITE) { 595 dma_sync_single_for_device(mmc_dev(host->mmc), 596 host->align_addr, 128 * 4, direction); 597 } 598 599 host->adma_addr = dma_map_single(mmc_dev(host->mmc), 600 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE); 601 if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr)) 602 goto unmap_entries; 603 BUG_ON(host->adma_addr & 0x3); 604 605 return 0; 606 607 unmap_entries: 608 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 609 data->sg_len, direction); 610 unmap_align: 611 dma_unmap_single(mmc_dev(host->mmc), host->align_addr, 612 128 * 4, direction); 613 fail: 614 return -EINVAL; 615 } 616 617 static void sdhci_adma_table_post(struct sdhci_host *host, 618 struct mmc_data *data) 619 { 620 int direction; 621 622 struct scatterlist *sg; 623 int i, size; 624 u8 *align; 625 char *buffer; 626 unsigned long flags; 627 628 if (data->flags & MMC_DATA_READ) 629 direction = DMA_FROM_DEVICE; 630 else 631 direction = DMA_TO_DEVICE; 632 633 dma_unmap_single(mmc_dev(host->mmc), host->adma_addr, 634 (128 * 2 + 1) * 4, DMA_TO_DEVICE); 635 636 dma_unmap_single(mmc_dev(host->mmc), host->align_addr, 637 128 * 4, direction); 638 639 if (data->flags & MMC_DATA_READ) { 640 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg, 641 data->sg_len, direction); 642 643 align = host->align_buffer; 644 645 for_each_sg(data->sg, sg, host->sg_count, i) { 646 if (sg_dma_address(sg) & 0x3) { 647 size = 4 - (sg_dma_address(sg) & 0x3); 648 649 buffer = sdhci_kmap_atomic(sg, &flags); 650 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3)); 651 memcpy(buffer, align, size); 652 sdhci_kunmap_atomic(buffer, &flags); 653 654 align += 4; 655 } 656 } 657 } 658 659 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 660 data->sg_len, direction); 661 } 662 663 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd) 664 { 665 u8 count; 666 struct mmc_data *data = cmd->data; 667 unsigned target_timeout, current_timeout; 668 669 /* 670 * If the host controller provides us with an incorrect timeout 671 * value, just skip the check and use 0xE. The hardware may take 672 * longer to time out, but that's much better than having a too-short 673 * timeout value. 674 */ 675 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) 676 return 0xE; 677 678 /* Unspecified timeout, assume max */ 679 if (!data && !cmd->cmd_timeout_ms) 680 return 0xE; 681 682 /* timeout in us */ 683 if (!data) 684 target_timeout = cmd->cmd_timeout_ms * 1000; 685 else { 686 target_timeout = data->timeout_ns / 1000; 687 if (host->clock) 688 target_timeout += data->timeout_clks / host->clock; 689 } 690 691 /* 692 * Figure out needed cycles. 693 * We do this in steps in order to fit inside a 32 bit int. 694 * The first step is the minimum timeout, which will have a 695 * minimum resolution of 6 bits: 696 * (1) 2^13*1000 > 2^22, 697 * (2) host->timeout_clk < 2^16 698 * => 699 * (1) / (2) > 2^6 700 */ 701 count = 0; 702 current_timeout = (1 << 13) * 1000 / host->timeout_clk; 703 while (current_timeout < target_timeout) { 704 count++; 705 current_timeout <<= 1; 706 if (count >= 0xF) 707 break; 708 } 709 710 if (count >= 0xF) { 711 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n", 712 mmc_hostname(host->mmc), count, cmd->opcode); 713 count = 0xE; 714 } 715 716 return count; 717 } 718 719 static void sdhci_set_transfer_irqs(struct sdhci_host *host) 720 { 721 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL; 722 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR; 723 724 if (host->flags & SDHCI_REQ_USE_DMA) 725 sdhci_clear_set_irqs(host, pio_irqs, dma_irqs); 726 else 727 sdhci_clear_set_irqs(host, dma_irqs, pio_irqs); 728 } 729 730 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) 731 { 732 u8 count; 733 u8 ctrl; 734 struct mmc_data *data = cmd->data; 735 int ret; 736 737 WARN_ON(host->data); 738 739 if (data || (cmd->flags & MMC_RSP_BUSY)) { 740 count = sdhci_calc_timeout(host, cmd); 741 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL); 742 } 743 744 if (!data) 745 return; 746 747 /* Sanity checks */ 748 BUG_ON(data->blksz * data->blocks > 524288); 749 BUG_ON(data->blksz > host->mmc->max_blk_size); 750 BUG_ON(data->blocks > 65535); 751 752 host->data = data; 753 host->data_early = 0; 754 host->data->bytes_xfered = 0; 755 756 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) 757 host->flags |= SDHCI_REQ_USE_DMA; 758 759 /* 760 * FIXME: This doesn't account for merging when mapping the 761 * scatterlist. 762 */ 763 if (host->flags & SDHCI_REQ_USE_DMA) { 764 int broken, i; 765 struct scatterlist *sg; 766 767 broken = 0; 768 if (host->flags & SDHCI_USE_ADMA) { 769 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) 770 broken = 1; 771 } else { 772 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) 773 broken = 1; 774 } 775 776 if (unlikely(broken)) { 777 for_each_sg(data->sg, sg, data->sg_len, i) { 778 if (sg->length & 0x3) { 779 DBG("Reverting to PIO because of " 780 "transfer size (%d)\n", 781 sg->length); 782 host->flags &= ~SDHCI_REQ_USE_DMA; 783 break; 784 } 785 } 786 } 787 } 788 789 /* 790 * The assumption here being that alignment is the same after 791 * translation to device address space. 792 */ 793 if (host->flags & SDHCI_REQ_USE_DMA) { 794 int broken, i; 795 struct scatterlist *sg; 796 797 broken = 0; 798 if (host->flags & SDHCI_USE_ADMA) { 799 /* 800 * As we use 3 byte chunks to work around 801 * alignment problems, we need to check this 802 * quirk. 803 */ 804 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) 805 broken = 1; 806 } else { 807 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) 808 broken = 1; 809 } 810 811 if (unlikely(broken)) { 812 for_each_sg(data->sg, sg, data->sg_len, i) { 813 if (sg->offset & 0x3) { 814 DBG("Reverting to PIO because of " 815 "bad alignment\n"); 816 host->flags &= ~SDHCI_REQ_USE_DMA; 817 break; 818 } 819 } 820 } 821 } 822 823 if (host->flags & SDHCI_REQ_USE_DMA) { 824 if (host->flags & SDHCI_USE_ADMA) { 825 ret = sdhci_adma_table_pre(host, data); 826 if (ret) { 827 /* 828 * This only happens when someone fed 829 * us an invalid request. 830 */ 831 WARN_ON(1); 832 host->flags &= ~SDHCI_REQ_USE_DMA; 833 } else { 834 sdhci_writel(host, host->adma_addr, 835 SDHCI_ADMA_ADDRESS); 836 } 837 } else { 838 int sg_cnt; 839 840 sg_cnt = dma_map_sg(mmc_dev(host->mmc), 841 data->sg, data->sg_len, 842 (data->flags & MMC_DATA_READ) ? 843 DMA_FROM_DEVICE : 844 DMA_TO_DEVICE); 845 if (sg_cnt == 0) { 846 /* 847 * This only happens when someone fed 848 * us an invalid request. 849 */ 850 WARN_ON(1); 851 host->flags &= ~SDHCI_REQ_USE_DMA; 852 } else { 853 WARN_ON(sg_cnt != 1); 854 sdhci_writel(host, sg_dma_address(data->sg), 855 SDHCI_DMA_ADDRESS); 856 } 857 } 858 } 859 860 /* 861 * Always adjust the DMA selection as some controllers 862 * (e.g. JMicron) can't do PIO properly when the selection 863 * is ADMA. 864 */ 865 if (host->version >= SDHCI_SPEC_200) { 866 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 867 ctrl &= ~SDHCI_CTRL_DMA_MASK; 868 if ((host->flags & SDHCI_REQ_USE_DMA) && 869 (host->flags & SDHCI_USE_ADMA)) 870 ctrl |= SDHCI_CTRL_ADMA32; 871 else 872 ctrl |= SDHCI_CTRL_SDMA; 873 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 874 } 875 876 if (!(host->flags & SDHCI_REQ_USE_DMA)) { 877 int flags; 878 879 flags = SG_MITER_ATOMIC; 880 if (host->data->flags & MMC_DATA_READ) 881 flags |= SG_MITER_TO_SG; 882 else 883 flags |= SG_MITER_FROM_SG; 884 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 885 host->blocks = data->blocks; 886 } 887 888 sdhci_set_transfer_irqs(host); 889 890 /* Set the DMA boundary value and block size */ 891 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 892 data->blksz), SDHCI_BLOCK_SIZE); 893 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); 894 } 895 896 static void sdhci_set_transfer_mode(struct sdhci_host *host, 897 struct mmc_command *cmd) 898 { 899 u16 mode; 900 struct mmc_data *data = cmd->data; 901 902 if (data == NULL) 903 return; 904 905 WARN_ON(!host->data); 906 907 mode = SDHCI_TRNS_BLK_CNT_EN; 908 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) { 909 mode |= SDHCI_TRNS_MULTI; 910 /* 911 * If we are sending CMD23, CMD12 never gets sent 912 * on successful completion (so no Auto-CMD12). 913 */ 914 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) 915 mode |= SDHCI_TRNS_AUTO_CMD12; 916 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) { 917 mode |= SDHCI_TRNS_AUTO_CMD23; 918 sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2); 919 } 920 } 921 922 if (data->flags & MMC_DATA_READ) 923 mode |= SDHCI_TRNS_READ; 924 if (host->flags & SDHCI_REQ_USE_DMA) 925 mode |= SDHCI_TRNS_DMA; 926 927 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE); 928 } 929 930 static void sdhci_finish_data(struct sdhci_host *host) 931 { 932 struct mmc_data *data; 933 934 BUG_ON(!host->data); 935 936 data = host->data; 937 host->data = NULL; 938 939 if (host->flags & SDHCI_REQ_USE_DMA) { 940 if (host->flags & SDHCI_USE_ADMA) 941 sdhci_adma_table_post(host, data); 942 else { 943 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 944 data->sg_len, (data->flags & MMC_DATA_READ) ? 945 DMA_FROM_DEVICE : DMA_TO_DEVICE); 946 } 947 } 948 949 /* 950 * The specification states that the block count register must 951 * be updated, but it does not specify at what point in the 952 * data flow. That makes the register entirely useless to read 953 * back so we have to assume that nothing made it to the card 954 * in the event of an error. 955 */ 956 if (data->error) 957 data->bytes_xfered = 0; 958 else 959 data->bytes_xfered = data->blksz * data->blocks; 960 961 /* 962 * Need to send CMD12 if - 963 * a) open-ended multiblock transfer (no CMD23) 964 * b) error in multiblock transfer 965 */ 966 if (data->stop && 967 (data->error || 968 !host->mrq->sbc)) { 969 970 /* 971 * The controller needs a reset of internal state machines 972 * upon error conditions. 973 */ 974 if (data->error) { 975 sdhci_reset(host, SDHCI_RESET_CMD); 976 sdhci_reset(host, SDHCI_RESET_DATA); 977 } 978 979 sdhci_send_command(host, data->stop); 980 } else 981 tasklet_schedule(&host->finish_tasklet); 982 } 983 984 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) 985 { 986 int flags; 987 u32 mask; 988 unsigned long timeout; 989 990 WARN_ON(host->cmd); 991 992 /* Wait max 10 ms */ 993 timeout = 10; 994 995 mask = SDHCI_CMD_INHIBIT; 996 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY)) 997 mask |= SDHCI_DATA_INHIBIT; 998 999 /* We shouldn't wait for data inihibit for stop commands, even 1000 though they might use busy signaling */ 1001 if (host->mrq->data && (cmd == host->mrq->data->stop)) 1002 mask &= ~SDHCI_DATA_INHIBIT; 1003 1004 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { 1005 if (timeout == 0) { 1006 pr_err("%s: Controller never released " 1007 "inhibit bit(s).\n", mmc_hostname(host->mmc)); 1008 sdhci_dumpregs(host); 1009 cmd->error = -EIO; 1010 tasklet_schedule(&host->finish_tasklet); 1011 return; 1012 } 1013 timeout--; 1014 mdelay(1); 1015 } 1016 1017 mod_timer(&host->timer, jiffies + 10 * HZ); 1018 1019 host->cmd = cmd; 1020 1021 sdhci_prepare_data(host, cmd); 1022 1023 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT); 1024 1025 sdhci_set_transfer_mode(host, cmd); 1026 1027 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { 1028 pr_err("%s: Unsupported response type!\n", 1029 mmc_hostname(host->mmc)); 1030 cmd->error = -EINVAL; 1031 tasklet_schedule(&host->finish_tasklet); 1032 return; 1033 } 1034 1035 if (!(cmd->flags & MMC_RSP_PRESENT)) 1036 flags = SDHCI_CMD_RESP_NONE; 1037 else if (cmd->flags & MMC_RSP_136) 1038 flags = SDHCI_CMD_RESP_LONG; 1039 else if (cmd->flags & MMC_RSP_BUSY) 1040 flags = SDHCI_CMD_RESP_SHORT_BUSY; 1041 else 1042 flags = SDHCI_CMD_RESP_SHORT; 1043 1044 if (cmd->flags & MMC_RSP_CRC) 1045 flags |= SDHCI_CMD_CRC; 1046 if (cmd->flags & MMC_RSP_OPCODE) 1047 flags |= SDHCI_CMD_INDEX; 1048 1049 /* CMD19 is special in that the Data Present Select should be set */ 1050 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK || 1051 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200) 1052 flags |= SDHCI_CMD_DATA; 1053 1054 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND); 1055 } 1056 1057 static void sdhci_finish_command(struct sdhci_host *host) 1058 { 1059 int i; 1060 1061 BUG_ON(host->cmd == NULL); 1062 1063 if (host->cmd->flags & MMC_RSP_PRESENT) { 1064 if (host->cmd->flags & MMC_RSP_136) { 1065 /* CRC is stripped so we need to do some shifting. */ 1066 for (i = 0;i < 4;i++) { 1067 host->cmd->resp[i] = sdhci_readl(host, 1068 SDHCI_RESPONSE + (3-i)*4) << 8; 1069 if (i != 3) 1070 host->cmd->resp[i] |= 1071 sdhci_readb(host, 1072 SDHCI_RESPONSE + (3-i)*4-1); 1073 } 1074 } else { 1075 host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE); 1076 } 1077 } 1078 1079 host->cmd->error = 0; 1080 1081 /* Finished CMD23, now send actual command. */ 1082 if (host->cmd == host->mrq->sbc) { 1083 host->cmd = NULL; 1084 sdhci_send_command(host, host->mrq->cmd); 1085 } else { 1086 1087 /* Processed actual command. */ 1088 if (host->data && host->data_early) 1089 sdhci_finish_data(host); 1090 1091 if (!host->cmd->data) 1092 tasklet_schedule(&host->finish_tasklet); 1093 1094 host->cmd = NULL; 1095 } 1096 } 1097 1098 static u16 sdhci_get_preset_value(struct sdhci_host *host) 1099 { 1100 u16 ctrl, preset = 0; 1101 1102 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1103 1104 switch (ctrl & SDHCI_CTRL_UHS_MASK) { 1105 case SDHCI_CTRL_UHS_SDR12: 1106 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); 1107 break; 1108 case SDHCI_CTRL_UHS_SDR25: 1109 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25); 1110 break; 1111 case SDHCI_CTRL_UHS_SDR50: 1112 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50); 1113 break; 1114 case SDHCI_CTRL_UHS_SDR104: 1115 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104); 1116 break; 1117 case SDHCI_CTRL_UHS_DDR50: 1118 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50); 1119 break; 1120 default: 1121 pr_warn("%s: Invalid UHS-I mode selected\n", 1122 mmc_hostname(host->mmc)); 1123 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); 1124 break; 1125 } 1126 return preset; 1127 } 1128 1129 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) 1130 { 1131 int div = 0; /* Initialized for compiler warning */ 1132 int real_div = div, clk_mul = 1; 1133 u16 clk = 0; 1134 unsigned long timeout; 1135 1136 if (clock && clock == host->clock) 1137 return; 1138 1139 host->mmc->actual_clock = 0; 1140 1141 if (host->ops->set_clock) { 1142 host->ops->set_clock(host, clock); 1143 if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) 1144 return; 1145 } 1146 1147 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); 1148 1149 if (clock == 0) 1150 goto out; 1151 1152 if (host->version >= SDHCI_SPEC_300) { 1153 if (sdhci_readw(host, SDHCI_HOST_CONTROL2) & 1154 SDHCI_CTRL_PRESET_VAL_ENABLE) { 1155 u16 pre_val; 1156 1157 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1158 pre_val = sdhci_get_preset_value(host); 1159 div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK) 1160 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT; 1161 if (host->clk_mul && 1162 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) { 1163 clk = SDHCI_PROG_CLOCK_MODE; 1164 real_div = div + 1; 1165 clk_mul = host->clk_mul; 1166 } else { 1167 real_div = max_t(int, 1, div << 1); 1168 } 1169 goto clock_set; 1170 } 1171 1172 /* 1173 * Check if the Host Controller supports Programmable Clock 1174 * Mode. 1175 */ 1176 if (host->clk_mul) { 1177 for (div = 1; div <= 1024; div++) { 1178 if ((host->max_clk * host->clk_mul / div) 1179 <= clock) 1180 break; 1181 } 1182 /* 1183 * Set Programmable Clock Mode in the Clock 1184 * Control register. 1185 */ 1186 clk = SDHCI_PROG_CLOCK_MODE; 1187 real_div = div; 1188 clk_mul = host->clk_mul; 1189 div--; 1190 } else { 1191 /* Version 3.00 divisors must be a multiple of 2. */ 1192 if (host->max_clk <= clock) 1193 div = 1; 1194 else { 1195 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; 1196 div += 2) { 1197 if ((host->max_clk / div) <= clock) 1198 break; 1199 } 1200 } 1201 real_div = div; 1202 div >>= 1; 1203 } 1204 } else { 1205 /* Version 2.00 divisors must be a power of 2. */ 1206 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) { 1207 if ((host->max_clk / div) <= clock) 1208 break; 1209 } 1210 real_div = div; 1211 div >>= 1; 1212 } 1213 1214 clock_set: 1215 if (real_div) 1216 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div; 1217 1218 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT; 1219 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) 1220 << SDHCI_DIVIDER_HI_SHIFT; 1221 clk |= SDHCI_CLOCK_INT_EN; 1222 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1223 1224 /* Wait max 20 ms */ 1225 timeout = 20; 1226 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL)) 1227 & SDHCI_CLOCK_INT_STABLE)) { 1228 if (timeout == 0) { 1229 pr_err("%s: Internal clock never " 1230 "stabilised.\n", mmc_hostname(host->mmc)); 1231 sdhci_dumpregs(host); 1232 return; 1233 } 1234 timeout--; 1235 mdelay(1); 1236 } 1237 1238 clk |= SDHCI_CLOCK_CARD_EN; 1239 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1240 1241 out: 1242 host->clock = clock; 1243 } 1244 1245 static inline void sdhci_update_clock(struct sdhci_host *host) 1246 { 1247 unsigned int clock; 1248 1249 clock = host->clock; 1250 host->clock = 0; 1251 sdhci_set_clock(host, clock); 1252 } 1253 1254 static int sdhci_set_power(struct sdhci_host *host, unsigned short power) 1255 { 1256 u8 pwr = 0; 1257 1258 if (power != (unsigned short)-1) { 1259 switch (1 << power) { 1260 case MMC_VDD_165_195: 1261 pwr = SDHCI_POWER_180; 1262 break; 1263 case MMC_VDD_29_30: 1264 case MMC_VDD_30_31: 1265 pwr = SDHCI_POWER_300; 1266 break; 1267 case MMC_VDD_32_33: 1268 case MMC_VDD_33_34: 1269 pwr = SDHCI_POWER_330; 1270 break; 1271 default: 1272 BUG(); 1273 } 1274 } 1275 1276 if (host->pwr == pwr) 1277 return -1; 1278 1279 host->pwr = pwr; 1280 1281 if (pwr == 0) { 1282 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 1283 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 1284 sdhci_runtime_pm_bus_off(host); 1285 return 0; 1286 } 1287 1288 /* 1289 * Spec says that we should clear the power reg before setting 1290 * a new value. Some controllers don't seem to like this though. 1291 */ 1292 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE)) 1293 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); 1294 1295 /* 1296 * At least the Marvell CaFe chip gets confused if we set the voltage 1297 * and set turn on power at the same time, so set the voltage first. 1298 */ 1299 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER) 1300 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); 1301 1302 pwr |= SDHCI_POWER_ON; 1303 1304 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); 1305 1306 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) 1307 sdhci_runtime_pm_bus_on(host); 1308 1309 /* 1310 * Some controllers need an extra 10ms delay of 10ms before they 1311 * can apply clock after applying power 1312 */ 1313 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER) 1314 mdelay(10); 1315 1316 return power; 1317 } 1318 1319 /*****************************************************************************\ 1320 * * 1321 * MMC callbacks * 1322 * * 1323 \*****************************************************************************/ 1324 1325 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) 1326 { 1327 struct sdhci_host *host; 1328 int present; 1329 unsigned long flags; 1330 u32 tuning_opcode; 1331 1332 host = mmc_priv(mmc); 1333 1334 sdhci_runtime_pm_get(host); 1335 1336 spin_lock_irqsave(&host->lock, flags); 1337 1338 WARN_ON(host->mrq != NULL); 1339 1340 #ifndef SDHCI_USE_LEDS_CLASS 1341 sdhci_activate_led(host); 1342 #endif 1343 1344 /* 1345 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED 1346 * requests if Auto-CMD12 is enabled. 1347 */ 1348 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) { 1349 if (mrq->stop) { 1350 mrq->data->stop = NULL; 1351 mrq->stop = NULL; 1352 } 1353 } 1354 1355 host->mrq = mrq; 1356 1357 /* 1358 * Firstly check card presence from cd-gpio. The return could 1359 * be one of the following possibilities: 1360 * negative: cd-gpio is not available 1361 * zero: cd-gpio is used, and card is removed 1362 * one: cd-gpio is used, and card is present 1363 */ 1364 present = mmc_gpio_get_cd(host->mmc); 1365 if (present < 0) { 1366 /* If polling, assume that the card is always present. */ 1367 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) 1368 present = 1; 1369 else 1370 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 1371 SDHCI_CARD_PRESENT; 1372 } 1373 1374 if (!present || host->flags & SDHCI_DEVICE_DEAD) { 1375 host->mrq->cmd->error = -ENOMEDIUM; 1376 tasklet_schedule(&host->finish_tasklet); 1377 } else { 1378 u32 present_state; 1379 1380 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE); 1381 /* 1382 * Check if the re-tuning timer has already expired and there 1383 * is no on-going data transfer. If so, we need to execute 1384 * tuning procedure before sending command. 1385 */ 1386 if ((host->flags & SDHCI_NEEDS_RETUNING) && 1387 !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) { 1388 if (mmc->card) { 1389 /* eMMC uses cmd21 but sd and sdio use cmd19 */ 1390 tuning_opcode = 1391 mmc->card->type == MMC_TYPE_MMC ? 1392 MMC_SEND_TUNING_BLOCK_HS200 : 1393 MMC_SEND_TUNING_BLOCK; 1394 spin_unlock_irqrestore(&host->lock, flags); 1395 sdhci_execute_tuning(mmc, tuning_opcode); 1396 spin_lock_irqsave(&host->lock, flags); 1397 1398 /* Restore original mmc_request structure */ 1399 host->mrq = mrq; 1400 } 1401 } 1402 1403 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23)) 1404 sdhci_send_command(host, mrq->sbc); 1405 else 1406 sdhci_send_command(host, mrq->cmd); 1407 } 1408 1409 mmiowb(); 1410 spin_unlock_irqrestore(&host->lock, flags); 1411 } 1412 1413 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) 1414 { 1415 unsigned long flags; 1416 int vdd_bit = -1; 1417 u8 ctrl; 1418 1419 spin_lock_irqsave(&host->lock, flags); 1420 1421 if (host->flags & SDHCI_DEVICE_DEAD) { 1422 spin_unlock_irqrestore(&host->lock, flags); 1423 if (host->vmmc && ios->power_mode == MMC_POWER_OFF) 1424 mmc_regulator_set_ocr(host->mmc, host->vmmc, 0); 1425 return; 1426 } 1427 1428 /* 1429 * Reset the chip on each power off. 1430 * Should clear out any weird states. 1431 */ 1432 if (ios->power_mode == MMC_POWER_OFF) { 1433 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); 1434 sdhci_reinit(host); 1435 } 1436 1437 if (host->version >= SDHCI_SPEC_300 && 1438 (ios->power_mode == MMC_POWER_UP)) 1439 sdhci_enable_preset_value(host, false); 1440 1441 sdhci_set_clock(host, ios->clock); 1442 1443 if (ios->power_mode == MMC_POWER_OFF) 1444 vdd_bit = sdhci_set_power(host, -1); 1445 else 1446 vdd_bit = sdhci_set_power(host, ios->vdd); 1447 1448 if (host->vmmc && vdd_bit != -1) { 1449 spin_unlock_irqrestore(&host->lock, flags); 1450 mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd_bit); 1451 spin_lock_irqsave(&host->lock, flags); 1452 } 1453 1454 if (host->ops->platform_send_init_74_clocks) 1455 host->ops->platform_send_init_74_clocks(host, ios->power_mode); 1456 1457 /* 1458 * If your platform has 8-bit width support but is not a v3 controller, 1459 * or if it requires special setup code, you should implement that in 1460 * platform_bus_width(). 1461 */ 1462 if (host->ops->platform_bus_width) { 1463 host->ops->platform_bus_width(host, ios->bus_width); 1464 } else { 1465 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 1466 if (ios->bus_width == MMC_BUS_WIDTH_8) { 1467 ctrl &= ~SDHCI_CTRL_4BITBUS; 1468 if (host->version >= SDHCI_SPEC_300) 1469 ctrl |= SDHCI_CTRL_8BITBUS; 1470 } else { 1471 if (host->version >= SDHCI_SPEC_300) 1472 ctrl &= ~SDHCI_CTRL_8BITBUS; 1473 if (ios->bus_width == MMC_BUS_WIDTH_4) 1474 ctrl |= SDHCI_CTRL_4BITBUS; 1475 else 1476 ctrl &= ~SDHCI_CTRL_4BITBUS; 1477 } 1478 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1479 } 1480 1481 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 1482 1483 if ((ios->timing == MMC_TIMING_SD_HS || 1484 ios->timing == MMC_TIMING_MMC_HS) 1485 && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) 1486 ctrl |= SDHCI_CTRL_HISPD; 1487 else 1488 ctrl &= ~SDHCI_CTRL_HISPD; 1489 1490 if (host->version >= SDHCI_SPEC_300) { 1491 u16 clk, ctrl_2; 1492 1493 /* In case of UHS-I modes, set High Speed Enable */ 1494 if ((ios->timing == MMC_TIMING_MMC_HS200) || 1495 (ios->timing == MMC_TIMING_UHS_SDR50) || 1496 (ios->timing == MMC_TIMING_UHS_SDR104) || 1497 (ios->timing == MMC_TIMING_UHS_DDR50) || 1498 (ios->timing == MMC_TIMING_UHS_SDR25)) 1499 ctrl |= SDHCI_CTRL_HISPD; 1500 1501 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1502 if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) { 1503 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1504 /* 1505 * We only need to set Driver Strength if the 1506 * preset value enable is not set. 1507 */ 1508 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK; 1509 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A) 1510 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A; 1511 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C) 1512 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; 1513 1514 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 1515 } else { 1516 /* 1517 * According to SDHC Spec v3.00, if the Preset Value 1518 * Enable in the Host Control 2 register is set, we 1519 * need to reset SD Clock Enable before changing High 1520 * Speed Enable to avoid generating clock gliches. 1521 */ 1522 1523 /* Reset SD Clock Enable */ 1524 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1525 clk &= ~SDHCI_CLOCK_CARD_EN; 1526 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1527 1528 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1529 1530 /* Re-enable SD Clock */ 1531 sdhci_update_clock(host); 1532 } 1533 1534 1535 /* Reset SD Clock Enable */ 1536 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 1537 clk &= ~SDHCI_CLOCK_CARD_EN; 1538 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 1539 1540 if (host->ops->set_uhs_signaling) 1541 host->ops->set_uhs_signaling(host, ios->timing); 1542 else { 1543 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1544 /* Select Bus Speed Mode for host */ 1545 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 1546 if ((ios->timing == MMC_TIMING_MMC_HS200) || 1547 (ios->timing == MMC_TIMING_UHS_SDR104)) 1548 ctrl_2 |= SDHCI_CTRL_UHS_SDR104; 1549 else if (ios->timing == MMC_TIMING_UHS_SDR12) 1550 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 1551 else if (ios->timing == MMC_TIMING_UHS_SDR25) 1552 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 1553 else if (ios->timing == MMC_TIMING_UHS_SDR50) 1554 ctrl_2 |= SDHCI_CTRL_UHS_SDR50; 1555 else if (ios->timing == MMC_TIMING_UHS_DDR50) 1556 ctrl_2 |= SDHCI_CTRL_UHS_DDR50; 1557 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 1558 } 1559 1560 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) && 1561 ((ios->timing == MMC_TIMING_UHS_SDR12) || 1562 (ios->timing == MMC_TIMING_UHS_SDR25) || 1563 (ios->timing == MMC_TIMING_UHS_SDR50) || 1564 (ios->timing == MMC_TIMING_UHS_SDR104) || 1565 (ios->timing == MMC_TIMING_UHS_DDR50))) { 1566 u16 preset; 1567 1568 sdhci_enable_preset_value(host, true); 1569 preset = sdhci_get_preset_value(host); 1570 ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK) 1571 >> SDHCI_PRESET_DRV_SHIFT; 1572 } 1573 1574 /* Re-enable SD Clock */ 1575 sdhci_update_clock(host); 1576 } else 1577 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 1578 1579 /* 1580 * Some (ENE) controllers go apeshit on some ios operation, 1581 * signalling timeout and CRC errors even on CMD0. Resetting 1582 * it on each ios seems to solve the problem. 1583 */ 1584 if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS) 1585 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 1586 1587 mmiowb(); 1588 spin_unlock_irqrestore(&host->lock, flags); 1589 } 1590 1591 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1592 { 1593 struct sdhci_host *host = mmc_priv(mmc); 1594 1595 sdhci_runtime_pm_get(host); 1596 sdhci_do_set_ios(host, ios); 1597 sdhci_runtime_pm_put(host); 1598 } 1599 1600 static int sdhci_do_get_cd(struct sdhci_host *host) 1601 { 1602 int gpio_cd = mmc_gpio_get_cd(host->mmc); 1603 1604 if (host->flags & SDHCI_DEVICE_DEAD) 1605 return 0; 1606 1607 /* If polling/nonremovable, assume that the card is always present. */ 1608 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) || 1609 (host->mmc->caps & MMC_CAP_NONREMOVABLE)) 1610 return 1; 1611 1612 /* Try slot gpio detect */ 1613 if (!IS_ERR_VALUE(gpio_cd)) 1614 return !!gpio_cd; 1615 1616 /* Host native card detect */ 1617 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); 1618 } 1619 1620 static int sdhci_get_cd(struct mmc_host *mmc) 1621 { 1622 struct sdhci_host *host = mmc_priv(mmc); 1623 int ret; 1624 1625 sdhci_runtime_pm_get(host); 1626 ret = sdhci_do_get_cd(host); 1627 sdhci_runtime_pm_put(host); 1628 return ret; 1629 } 1630 1631 static int sdhci_check_ro(struct sdhci_host *host) 1632 { 1633 unsigned long flags; 1634 int is_readonly; 1635 1636 spin_lock_irqsave(&host->lock, flags); 1637 1638 if (host->flags & SDHCI_DEVICE_DEAD) 1639 is_readonly = 0; 1640 else if (host->ops->get_ro) 1641 is_readonly = host->ops->get_ro(host); 1642 else 1643 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) 1644 & SDHCI_WRITE_PROTECT); 1645 1646 spin_unlock_irqrestore(&host->lock, flags); 1647 1648 /* This quirk needs to be replaced by a callback-function later */ 1649 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ? 1650 !is_readonly : is_readonly; 1651 } 1652 1653 #define SAMPLE_COUNT 5 1654 1655 static int sdhci_do_get_ro(struct sdhci_host *host) 1656 { 1657 int i, ro_count; 1658 1659 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT)) 1660 return sdhci_check_ro(host); 1661 1662 ro_count = 0; 1663 for (i = 0; i < SAMPLE_COUNT; i++) { 1664 if (sdhci_check_ro(host)) { 1665 if (++ro_count > SAMPLE_COUNT / 2) 1666 return 1; 1667 } 1668 msleep(30); 1669 } 1670 return 0; 1671 } 1672 1673 static void sdhci_hw_reset(struct mmc_host *mmc) 1674 { 1675 struct sdhci_host *host = mmc_priv(mmc); 1676 1677 if (host->ops && host->ops->hw_reset) 1678 host->ops->hw_reset(host); 1679 } 1680 1681 static int sdhci_get_ro(struct mmc_host *mmc) 1682 { 1683 struct sdhci_host *host = mmc_priv(mmc); 1684 int ret; 1685 1686 sdhci_runtime_pm_get(host); 1687 ret = sdhci_do_get_ro(host); 1688 sdhci_runtime_pm_put(host); 1689 return ret; 1690 } 1691 1692 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable) 1693 { 1694 if (host->flags & SDHCI_DEVICE_DEAD) 1695 goto out; 1696 1697 if (enable) 1698 host->flags |= SDHCI_SDIO_IRQ_ENABLED; 1699 else 1700 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED; 1701 1702 /* SDIO IRQ will be enabled as appropriate in runtime resume */ 1703 if (host->runtime_suspended) 1704 goto out; 1705 1706 if (enable) 1707 sdhci_unmask_irqs(host, SDHCI_INT_CARD_INT); 1708 else 1709 sdhci_mask_irqs(host, SDHCI_INT_CARD_INT); 1710 out: 1711 mmiowb(); 1712 } 1713 1714 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) 1715 { 1716 struct sdhci_host *host = mmc_priv(mmc); 1717 unsigned long flags; 1718 1719 spin_lock_irqsave(&host->lock, flags); 1720 sdhci_enable_sdio_irq_nolock(host, enable); 1721 spin_unlock_irqrestore(&host->lock, flags); 1722 } 1723 1724 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host, 1725 struct mmc_ios *ios) 1726 { 1727 u16 ctrl; 1728 int ret; 1729 1730 /* 1731 * Signal Voltage Switching is only applicable for Host Controllers 1732 * v3.00 and above. 1733 */ 1734 if (host->version < SDHCI_SPEC_300) 1735 return 0; 1736 1737 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1738 1739 switch (ios->signal_voltage) { 1740 case MMC_SIGNAL_VOLTAGE_330: 1741 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ 1742 ctrl &= ~SDHCI_CTRL_VDD_180; 1743 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1744 1745 if (host->vqmmc) { 1746 ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000); 1747 if (ret) { 1748 pr_warning("%s: Switching to 3.3V signalling voltage " 1749 " failed\n", mmc_hostname(host->mmc)); 1750 return -EIO; 1751 } 1752 } 1753 /* Wait for 5ms */ 1754 usleep_range(5000, 5500); 1755 1756 /* 3.3V regulator output should be stable within 5 ms */ 1757 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1758 if (!(ctrl & SDHCI_CTRL_VDD_180)) 1759 return 0; 1760 1761 pr_warning("%s: 3.3V regulator output did not became stable\n", 1762 mmc_hostname(host->mmc)); 1763 1764 return -EAGAIN; 1765 case MMC_SIGNAL_VOLTAGE_180: 1766 if (host->vqmmc) { 1767 ret = regulator_set_voltage(host->vqmmc, 1768 1700000, 1950000); 1769 if (ret) { 1770 pr_warning("%s: Switching to 1.8V signalling voltage " 1771 " failed\n", mmc_hostname(host->mmc)); 1772 return -EIO; 1773 } 1774 } 1775 1776 /* 1777 * Enable 1.8V Signal Enable in the Host Control2 1778 * register 1779 */ 1780 ctrl |= SDHCI_CTRL_VDD_180; 1781 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1782 1783 /* Wait for 5ms */ 1784 usleep_range(5000, 5500); 1785 1786 /* 1.8V regulator output should be stable within 5 ms */ 1787 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1788 if (ctrl & SDHCI_CTRL_VDD_180) 1789 return 0; 1790 1791 pr_warning("%s: 1.8V regulator output did not became stable\n", 1792 mmc_hostname(host->mmc)); 1793 1794 return -EAGAIN; 1795 case MMC_SIGNAL_VOLTAGE_120: 1796 if (host->vqmmc) { 1797 ret = regulator_set_voltage(host->vqmmc, 1100000, 1300000); 1798 if (ret) { 1799 pr_warning("%s: Switching to 1.2V signalling voltage " 1800 " failed\n", mmc_hostname(host->mmc)); 1801 return -EIO; 1802 } 1803 } 1804 return 0; 1805 default: 1806 /* No signal voltage switch required */ 1807 return 0; 1808 } 1809 } 1810 1811 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, 1812 struct mmc_ios *ios) 1813 { 1814 struct sdhci_host *host = mmc_priv(mmc); 1815 int err; 1816 1817 if (host->version < SDHCI_SPEC_300) 1818 return 0; 1819 sdhci_runtime_pm_get(host); 1820 err = sdhci_do_start_signal_voltage_switch(host, ios); 1821 sdhci_runtime_pm_put(host); 1822 return err; 1823 } 1824 1825 static int sdhci_card_busy(struct mmc_host *mmc) 1826 { 1827 struct sdhci_host *host = mmc_priv(mmc); 1828 u32 present_state; 1829 1830 sdhci_runtime_pm_get(host); 1831 /* Check whether DAT[3:0] is 0000 */ 1832 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE); 1833 sdhci_runtime_pm_put(host); 1834 1835 return !(present_state & SDHCI_DATA_LVL_MASK); 1836 } 1837 1838 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) 1839 { 1840 struct sdhci_host *host; 1841 u16 ctrl; 1842 u32 ier; 1843 int tuning_loop_counter = MAX_TUNING_LOOP; 1844 unsigned long timeout; 1845 int err = 0; 1846 bool requires_tuning_nonuhs = false; 1847 1848 host = mmc_priv(mmc); 1849 1850 sdhci_runtime_pm_get(host); 1851 disable_irq(host->irq); 1852 spin_lock(&host->lock); 1853 1854 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1855 1856 /* 1857 * The Host Controller needs tuning only in case of SDR104 mode 1858 * and for SDR50 mode when Use Tuning for SDR50 is set in the 1859 * Capabilities register. 1860 * If the Host Controller supports the HS200 mode then the 1861 * tuning function has to be executed. 1862 */ 1863 if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) && 1864 (host->flags & SDHCI_SDR50_NEEDS_TUNING || 1865 host->flags & SDHCI_SDR104_NEEDS_TUNING)) 1866 requires_tuning_nonuhs = true; 1867 1868 if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) || 1869 requires_tuning_nonuhs) 1870 ctrl |= SDHCI_CTRL_EXEC_TUNING; 1871 else { 1872 spin_unlock(&host->lock); 1873 enable_irq(host->irq); 1874 sdhci_runtime_pm_put(host); 1875 return 0; 1876 } 1877 1878 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1879 1880 /* 1881 * As per the Host Controller spec v3.00, tuning command 1882 * generates Buffer Read Ready interrupt, so enable that. 1883 * 1884 * Note: The spec clearly says that when tuning sequence 1885 * is being performed, the controller does not generate 1886 * interrupts other than Buffer Read Ready interrupt. But 1887 * to make sure we don't hit a controller bug, we _only_ 1888 * enable Buffer Read Ready interrupt here. 1889 */ 1890 ier = sdhci_readl(host, SDHCI_INT_ENABLE); 1891 sdhci_clear_set_irqs(host, ier, SDHCI_INT_DATA_AVAIL); 1892 1893 /* 1894 * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number 1895 * of loops reaches 40 times or a timeout of 150ms occurs. 1896 */ 1897 timeout = 150; 1898 do { 1899 struct mmc_command cmd = {0}; 1900 struct mmc_request mrq = {NULL}; 1901 1902 if (!tuning_loop_counter && !timeout) 1903 break; 1904 1905 cmd.opcode = opcode; 1906 cmd.arg = 0; 1907 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 1908 cmd.retries = 0; 1909 cmd.data = NULL; 1910 cmd.error = 0; 1911 1912 mrq.cmd = &cmd; 1913 host->mrq = &mrq; 1914 1915 /* 1916 * In response to CMD19, the card sends 64 bytes of tuning 1917 * block to the Host Controller. So we set the block size 1918 * to 64 here. 1919 */ 1920 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) { 1921 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) 1922 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128), 1923 SDHCI_BLOCK_SIZE); 1924 else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) 1925 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), 1926 SDHCI_BLOCK_SIZE); 1927 } else { 1928 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), 1929 SDHCI_BLOCK_SIZE); 1930 } 1931 1932 /* 1933 * The tuning block is sent by the card to the host controller. 1934 * So we set the TRNS_READ bit in the Transfer Mode register. 1935 * This also takes care of setting DMA Enable and Multi Block 1936 * Select in the same register to 0. 1937 */ 1938 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE); 1939 1940 sdhci_send_command(host, &cmd); 1941 1942 host->cmd = NULL; 1943 host->mrq = NULL; 1944 1945 spin_unlock(&host->lock); 1946 enable_irq(host->irq); 1947 1948 /* Wait for Buffer Read Ready interrupt */ 1949 wait_event_interruptible_timeout(host->buf_ready_int, 1950 (host->tuning_done == 1), 1951 msecs_to_jiffies(50)); 1952 disable_irq(host->irq); 1953 spin_lock(&host->lock); 1954 1955 if (!host->tuning_done) { 1956 pr_info(DRIVER_NAME ": Timeout waiting for " 1957 "Buffer Read Ready interrupt during tuning " 1958 "procedure, falling back to fixed sampling " 1959 "clock\n"); 1960 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1961 ctrl &= ~SDHCI_CTRL_TUNED_CLK; 1962 ctrl &= ~SDHCI_CTRL_EXEC_TUNING; 1963 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1964 1965 err = -EIO; 1966 goto out; 1967 } 1968 1969 host->tuning_done = 0; 1970 1971 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 1972 tuning_loop_counter--; 1973 timeout--; 1974 mdelay(1); 1975 } while (ctrl & SDHCI_CTRL_EXEC_TUNING); 1976 1977 /* 1978 * The Host Driver has exhausted the maximum number of loops allowed, 1979 * so use fixed sampling frequency. 1980 */ 1981 if (!tuning_loop_counter || !timeout) { 1982 ctrl &= ~SDHCI_CTRL_TUNED_CLK; 1983 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 1984 } else { 1985 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) { 1986 pr_info(DRIVER_NAME ": Tuning procedure" 1987 " failed, falling back to fixed sampling" 1988 " clock\n"); 1989 err = -EIO; 1990 } 1991 } 1992 1993 out: 1994 /* 1995 * If this is the very first time we are here, we start the retuning 1996 * timer. Since only during the first time, SDHCI_NEEDS_RETUNING 1997 * flag won't be set, we check this condition before actually starting 1998 * the timer. 1999 */ 2000 if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count && 2001 (host->tuning_mode == SDHCI_TUNING_MODE_1)) { 2002 host->flags |= SDHCI_USING_RETUNING_TIMER; 2003 mod_timer(&host->tuning_timer, jiffies + 2004 host->tuning_count * HZ); 2005 /* Tuning mode 1 limits the maximum data length to 4MB */ 2006 mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size; 2007 } else { 2008 host->flags &= ~SDHCI_NEEDS_RETUNING; 2009 /* Reload the new initial value for timer */ 2010 if (host->tuning_mode == SDHCI_TUNING_MODE_1) 2011 mod_timer(&host->tuning_timer, jiffies + 2012 host->tuning_count * HZ); 2013 } 2014 2015 /* 2016 * In case tuning fails, host controllers which support re-tuning can 2017 * try tuning again at a later time, when the re-tuning timer expires. 2018 * So for these controllers, we return 0. Since there might be other 2019 * controllers who do not have this capability, we return error for 2020 * them. SDHCI_USING_RETUNING_TIMER means the host is currently using 2021 * a retuning timer to do the retuning for the card. 2022 */ 2023 if (err && (host->flags & SDHCI_USING_RETUNING_TIMER)) 2024 err = 0; 2025 2026 sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier); 2027 spin_unlock(&host->lock); 2028 enable_irq(host->irq); 2029 sdhci_runtime_pm_put(host); 2030 2031 return err; 2032 } 2033 2034 2035 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable) 2036 { 2037 u16 ctrl; 2038 2039 /* Host Controller v3.00 defines preset value registers */ 2040 if (host->version < SDHCI_SPEC_300) 2041 return; 2042 2043 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); 2044 2045 /* 2046 * We only enable or disable Preset Value if they are not already 2047 * enabled or disabled respectively. Otherwise, we bail out. 2048 */ 2049 if (enable && !(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) { 2050 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE; 2051 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2052 host->flags |= SDHCI_PV_ENABLED; 2053 } else if (!enable && (ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) { 2054 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE; 2055 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); 2056 host->flags &= ~SDHCI_PV_ENABLED; 2057 } 2058 } 2059 2060 static void sdhci_card_event(struct mmc_host *mmc) 2061 { 2062 struct sdhci_host *host = mmc_priv(mmc); 2063 unsigned long flags; 2064 2065 /* First check if client has provided their own card event */ 2066 if (host->ops->card_event) 2067 host->ops->card_event(host); 2068 2069 spin_lock_irqsave(&host->lock, flags); 2070 2071 /* Check host->mrq first in case we are runtime suspended */ 2072 if (host->mrq && !sdhci_do_get_cd(host)) { 2073 pr_err("%s: Card removed during transfer!\n", 2074 mmc_hostname(host->mmc)); 2075 pr_err("%s: Resetting controller.\n", 2076 mmc_hostname(host->mmc)); 2077 2078 sdhci_reset(host, SDHCI_RESET_CMD); 2079 sdhci_reset(host, SDHCI_RESET_DATA); 2080 2081 host->mrq->cmd->error = -ENOMEDIUM; 2082 tasklet_schedule(&host->finish_tasklet); 2083 } 2084 2085 spin_unlock_irqrestore(&host->lock, flags); 2086 } 2087 2088 static const struct mmc_host_ops sdhci_ops = { 2089 .request = sdhci_request, 2090 .set_ios = sdhci_set_ios, 2091 .get_cd = sdhci_get_cd, 2092 .get_ro = sdhci_get_ro, 2093 .hw_reset = sdhci_hw_reset, 2094 .enable_sdio_irq = sdhci_enable_sdio_irq, 2095 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch, 2096 .execute_tuning = sdhci_execute_tuning, 2097 .card_event = sdhci_card_event, 2098 .card_busy = sdhci_card_busy, 2099 }; 2100 2101 /*****************************************************************************\ 2102 * * 2103 * Tasklets * 2104 * * 2105 \*****************************************************************************/ 2106 2107 static void sdhci_tasklet_card(unsigned long param) 2108 { 2109 struct sdhci_host *host = (struct sdhci_host*)param; 2110 2111 sdhci_card_event(host->mmc); 2112 2113 mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 2114 } 2115 2116 static void sdhci_tasklet_finish(unsigned long param) 2117 { 2118 struct sdhci_host *host; 2119 unsigned long flags; 2120 struct mmc_request *mrq; 2121 2122 host = (struct sdhci_host*)param; 2123 2124 spin_lock_irqsave(&host->lock, flags); 2125 2126 /* 2127 * If this tasklet gets rescheduled while running, it will 2128 * be run again afterwards but without any active request. 2129 */ 2130 if (!host->mrq) { 2131 spin_unlock_irqrestore(&host->lock, flags); 2132 return; 2133 } 2134 2135 del_timer(&host->timer); 2136 2137 mrq = host->mrq; 2138 2139 /* 2140 * The controller needs a reset of internal state machines 2141 * upon error conditions. 2142 */ 2143 if (!(host->flags & SDHCI_DEVICE_DEAD) && 2144 ((mrq->cmd && mrq->cmd->error) || 2145 (mrq->data && (mrq->data->error || 2146 (mrq->data->stop && mrq->data->stop->error))) || 2147 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) { 2148 2149 /* Some controllers need this kick or reset won't work here */ 2150 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) 2151 /* This is to force an update */ 2152 sdhci_update_clock(host); 2153 2154 /* Spec says we should do both at the same time, but Ricoh 2155 controllers do not like that. */ 2156 sdhci_reset(host, SDHCI_RESET_CMD); 2157 sdhci_reset(host, SDHCI_RESET_DATA); 2158 } 2159 2160 host->mrq = NULL; 2161 host->cmd = NULL; 2162 host->data = NULL; 2163 2164 #ifndef SDHCI_USE_LEDS_CLASS 2165 sdhci_deactivate_led(host); 2166 #endif 2167 2168 mmiowb(); 2169 spin_unlock_irqrestore(&host->lock, flags); 2170 2171 mmc_request_done(host->mmc, mrq); 2172 sdhci_runtime_pm_put(host); 2173 } 2174 2175 static void sdhci_timeout_timer(unsigned long data) 2176 { 2177 struct sdhci_host *host; 2178 unsigned long flags; 2179 2180 host = (struct sdhci_host*)data; 2181 2182 spin_lock_irqsave(&host->lock, flags); 2183 2184 if (host->mrq) { 2185 pr_err("%s: Timeout waiting for hardware " 2186 "interrupt.\n", mmc_hostname(host->mmc)); 2187 sdhci_dumpregs(host); 2188 2189 if (host->data) { 2190 host->data->error = -ETIMEDOUT; 2191 sdhci_finish_data(host); 2192 } else { 2193 if (host->cmd) 2194 host->cmd->error = -ETIMEDOUT; 2195 else 2196 host->mrq->cmd->error = -ETIMEDOUT; 2197 2198 tasklet_schedule(&host->finish_tasklet); 2199 } 2200 } 2201 2202 mmiowb(); 2203 spin_unlock_irqrestore(&host->lock, flags); 2204 } 2205 2206 static void sdhci_tuning_timer(unsigned long data) 2207 { 2208 struct sdhci_host *host; 2209 unsigned long flags; 2210 2211 host = (struct sdhci_host *)data; 2212 2213 spin_lock_irqsave(&host->lock, flags); 2214 2215 host->flags |= SDHCI_NEEDS_RETUNING; 2216 2217 spin_unlock_irqrestore(&host->lock, flags); 2218 } 2219 2220 /*****************************************************************************\ 2221 * * 2222 * Interrupt handling * 2223 * * 2224 \*****************************************************************************/ 2225 2226 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask) 2227 { 2228 BUG_ON(intmask == 0); 2229 2230 if (!host->cmd) { 2231 pr_err("%s: Got command interrupt 0x%08x even " 2232 "though no command operation was in progress.\n", 2233 mmc_hostname(host->mmc), (unsigned)intmask); 2234 sdhci_dumpregs(host); 2235 return; 2236 } 2237 2238 if (intmask & SDHCI_INT_TIMEOUT) 2239 host->cmd->error = -ETIMEDOUT; 2240 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT | 2241 SDHCI_INT_INDEX)) 2242 host->cmd->error = -EILSEQ; 2243 2244 if (host->cmd->error) { 2245 tasklet_schedule(&host->finish_tasklet); 2246 return; 2247 } 2248 2249 /* 2250 * The host can send and interrupt when the busy state has 2251 * ended, allowing us to wait without wasting CPU cycles. 2252 * Unfortunately this is overloaded on the "data complete" 2253 * interrupt, so we need to take some care when handling 2254 * it. 2255 * 2256 * Note: The 1.0 specification is a bit ambiguous about this 2257 * feature so there might be some problems with older 2258 * controllers. 2259 */ 2260 if (host->cmd->flags & MMC_RSP_BUSY) { 2261 if (host->cmd->data) 2262 DBG("Cannot wait for busy signal when also " 2263 "doing a data transfer"); 2264 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)) 2265 return; 2266 2267 /* The controller does not support the end-of-busy IRQ, 2268 * fall through and take the SDHCI_INT_RESPONSE */ 2269 } 2270 2271 if (intmask & SDHCI_INT_RESPONSE) 2272 sdhci_finish_command(host); 2273 } 2274 2275 #ifdef CONFIG_MMC_DEBUG 2276 static void sdhci_show_adma_error(struct sdhci_host *host) 2277 { 2278 const char *name = mmc_hostname(host->mmc); 2279 u8 *desc = host->adma_desc; 2280 __le32 *dma; 2281 __le16 *len; 2282 u8 attr; 2283 2284 sdhci_dumpregs(host); 2285 2286 while (true) { 2287 dma = (__le32 *)(desc + 4); 2288 len = (__le16 *)(desc + 2); 2289 attr = *desc; 2290 2291 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n", 2292 name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr); 2293 2294 desc += 8; 2295 2296 if (attr & 2) 2297 break; 2298 } 2299 } 2300 #else 2301 static void sdhci_show_adma_error(struct sdhci_host *host) { } 2302 #endif 2303 2304 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) 2305 { 2306 u32 command; 2307 BUG_ON(intmask == 0); 2308 2309 /* CMD19 generates _only_ Buffer Read Ready interrupt */ 2310 if (intmask & SDHCI_INT_DATA_AVAIL) { 2311 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)); 2312 if (command == MMC_SEND_TUNING_BLOCK || 2313 command == MMC_SEND_TUNING_BLOCK_HS200) { 2314 host->tuning_done = 1; 2315 wake_up(&host->buf_ready_int); 2316 return; 2317 } 2318 } 2319 2320 if (!host->data) { 2321 /* 2322 * The "data complete" interrupt is also used to 2323 * indicate that a busy state has ended. See comment 2324 * above in sdhci_cmd_irq(). 2325 */ 2326 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) { 2327 if (intmask & SDHCI_INT_DATA_END) { 2328 sdhci_finish_command(host); 2329 return; 2330 } 2331 } 2332 2333 pr_err("%s: Got data interrupt 0x%08x even " 2334 "though no data operation was in progress.\n", 2335 mmc_hostname(host->mmc), (unsigned)intmask); 2336 sdhci_dumpregs(host); 2337 2338 return; 2339 } 2340 2341 if (intmask & SDHCI_INT_DATA_TIMEOUT) 2342 host->data->error = -ETIMEDOUT; 2343 else if (intmask & SDHCI_INT_DATA_END_BIT) 2344 host->data->error = -EILSEQ; 2345 else if ((intmask & SDHCI_INT_DATA_CRC) && 2346 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)) 2347 != MMC_BUS_TEST_R) 2348 host->data->error = -EILSEQ; 2349 else if (intmask & SDHCI_INT_ADMA_ERROR) { 2350 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc)); 2351 sdhci_show_adma_error(host); 2352 host->data->error = -EIO; 2353 if (host->ops->adma_workaround) 2354 host->ops->adma_workaround(host, intmask); 2355 } 2356 2357 if (host->data->error) 2358 sdhci_finish_data(host); 2359 else { 2360 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)) 2361 sdhci_transfer_pio(host); 2362 2363 /* 2364 * We currently don't do anything fancy with DMA 2365 * boundaries, but as we can't disable the feature 2366 * we need to at least restart the transfer. 2367 * 2368 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS) 2369 * should return a valid address to continue from, but as 2370 * some controllers are faulty, don't trust them. 2371 */ 2372 if (intmask & SDHCI_INT_DMA_END) { 2373 u32 dmastart, dmanow; 2374 dmastart = sg_dma_address(host->data->sg); 2375 dmanow = dmastart + host->data->bytes_xfered; 2376 /* 2377 * Force update to the next DMA block boundary. 2378 */ 2379 dmanow = (dmanow & 2380 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) + 2381 SDHCI_DEFAULT_BOUNDARY_SIZE; 2382 host->data->bytes_xfered = dmanow - dmastart; 2383 DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes," 2384 " next 0x%08x\n", 2385 mmc_hostname(host->mmc), dmastart, 2386 host->data->bytes_xfered, dmanow); 2387 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS); 2388 } 2389 2390 if (intmask & SDHCI_INT_DATA_END) { 2391 if (host->cmd) { 2392 /* 2393 * Data managed to finish before the 2394 * command completed. Make sure we do 2395 * things in the proper order. 2396 */ 2397 host->data_early = 1; 2398 } else { 2399 sdhci_finish_data(host); 2400 } 2401 } 2402 } 2403 } 2404 2405 static irqreturn_t sdhci_irq(int irq, void *dev_id) 2406 { 2407 irqreturn_t result; 2408 struct sdhci_host *host = dev_id; 2409 u32 intmask, unexpected = 0; 2410 int cardint = 0, max_loops = 16; 2411 2412 spin_lock(&host->lock); 2413 2414 if (host->runtime_suspended) { 2415 spin_unlock(&host->lock); 2416 pr_warning("%s: got irq while runtime suspended\n", 2417 mmc_hostname(host->mmc)); 2418 return IRQ_HANDLED; 2419 } 2420 2421 intmask = sdhci_readl(host, SDHCI_INT_STATUS); 2422 2423 if (!intmask || intmask == 0xffffffff) { 2424 result = IRQ_NONE; 2425 goto out; 2426 } 2427 2428 again: 2429 DBG("*** %s got interrupt: 0x%08x\n", 2430 mmc_hostname(host->mmc), intmask); 2431 2432 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { 2433 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & 2434 SDHCI_CARD_PRESENT; 2435 2436 /* 2437 * There is a observation on i.mx esdhc. INSERT bit will be 2438 * immediately set again when it gets cleared, if a card is 2439 * inserted. We have to mask the irq to prevent interrupt 2440 * storm which will freeze the system. And the REMOVE gets 2441 * the same situation. 2442 * 2443 * More testing are needed here to ensure it works for other 2444 * platforms though. 2445 */ 2446 sdhci_mask_irqs(host, present ? SDHCI_INT_CARD_INSERT : 2447 SDHCI_INT_CARD_REMOVE); 2448 sdhci_unmask_irqs(host, present ? SDHCI_INT_CARD_REMOVE : 2449 SDHCI_INT_CARD_INSERT); 2450 2451 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT | 2452 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS); 2453 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE); 2454 tasklet_schedule(&host->card_tasklet); 2455 } 2456 2457 if (intmask & SDHCI_INT_CMD_MASK) { 2458 sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK, 2459 SDHCI_INT_STATUS); 2460 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK); 2461 } 2462 2463 if (intmask & SDHCI_INT_DATA_MASK) { 2464 sdhci_writel(host, intmask & SDHCI_INT_DATA_MASK, 2465 SDHCI_INT_STATUS); 2466 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK); 2467 } 2468 2469 intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK); 2470 2471 intmask &= ~SDHCI_INT_ERROR; 2472 2473 if (intmask & SDHCI_INT_BUS_POWER) { 2474 pr_err("%s: Card is consuming too much power!\n", 2475 mmc_hostname(host->mmc)); 2476 sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS); 2477 } 2478 2479 intmask &= ~SDHCI_INT_BUS_POWER; 2480 2481 if (intmask & SDHCI_INT_CARD_INT) 2482 cardint = 1; 2483 2484 intmask &= ~SDHCI_INT_CARD_INT; 2485 2486 if (intmask) { 2487 unexpected |= intmask; 2488 sdhci_writel(host, intmask, SDHCI_INT_STATUS); 2489 } 2490 2491 result = IRQ_HANDLED; 2492 2493 intmask = sdhci_readl(host, SDHCI_INT_STATUS); 2494 if (intmask && --max_loops) 2495 goto again; 2496 out: 2497 spin_unlock(&host->lock); 2498 2499 if (unexpected) { 2500 pr_err("%s: Unexpected interrupt 0x%08x.\n", 2501 mmc_hostname(host->mmc), unexpected); 2502 sdhci_dumpregs(host); 2503 } 2504 /* 2505 * We have to delay this as it calls back into the driver. 2506 */ 2507 if (cardint) 2508 mmc_signal_sdio_irq(host->mmc); 2509 2510 return result; 2511 } 2512 2513 /*****************************************************************************\ 2514 * * 2515 * Suspend/resume * 2516 * * 2517 \*****************************************************************************/ 2518 2519 #ifdef CONFIG_PM 2520 void sdhci_enable_irq_wakeups(struct sdhci_host *host) 2521 { 2522 u8 val; 2523 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE 2524 | SDHCI_WAKE_ON_INT; 2525 2526 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); 2527 val |= mask ; 2528 /* Avoid fake wake up */ 2529 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) 2530 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE); 2531 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); 2532 } 2533 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups); 2534 2535 void sdhci_disable_irq_wakeups(struct sdhci_host *host) 2536 { 2537 u8 val; 2538 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE 2539 | SDHCI_WAKE_ON_INT; 2540 2541 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); 2542 val &= ~mask; 2543 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); 2544 } 2545 EXPORT_SYMBOL_GPL(sdhci_disable_irq_wakeups); 2546 2547 int sdhci_suspend_host(struct sdhci_host *host) 2548 { 2549 int ret; 2550 2551 if (host->ops->platform_suspend) 2552 host->ops->platform_suspend(host); 2553 2554 sdhci_disable_card_detection(host); 2555 2556 /* Disable tuning since we are suspending */ 2557 if (host->flags & SDHCI_USING_RETUNING_TIMER) { 2558 del_timer_sync(&host->tuning_timer); 2559 host->flags &= ~SDHCI_NEEDS_RETUNING; 2560 } 2561 2562 ret = mmc_suspend_host(host->mmc); 2563 if (ret) { 2564 if (host->flags & SDHCI_USING_RETUNING_TIMER) { 2565 host->flags |= SDHCI_NEEDS_RETUNING; 2566 mod_timer(&host->tuning_timer, jiffies + 2567 host->tuning_count * HZ); 2568 } 2569 2570 sdhci_enable_card_detection(host); 2571 2572 return ret; 2573 } 2574 2575 if (!device_may_wakeup(mmc_dev(host->mmc))) { 2576 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK); 2577 free_irq(host->irq, host); 2578 } else { 2579 sdhci_enable_irq_wakeups(host); 2580 enable_irq_wake(host->irq); 2581 } 2582 return ret; 2583 } 2584 2585 EXPORT_SYMBOL_GPL(sdhci_suspend_host); 2586 2587 int sdhci_resume_host(struct sdhci_host *host) 2588 { 2589 int ret; 2590 2591 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 2592 if (host->ops->enable_dma) 2593 host->ops->enable_dma(host); 2594 } 2595 2596 if (!device_may_wakeup(mmc_dev(host->mmc))) { 2597 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED, 2598 mmc_hostname(host->mmc), host); 2599 if (ret) 2600 return ret; 2601 } else { 2602 sdhci_disable_irq_wakeups(host); 2603 disable_irq_wake(host->irq); 2604 } 2605 2606 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) && 2607 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) { 2608 /* Card keeps power but host controller does not */ 2609 sdhci_init(host, 0); 2610 host->pwr = 0; 2611 host->clock = 0; 2612 sdhci_do_set_ios(host, &host->mmc->ios); 2613 } else { 2614 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER)); 2615 mmiowb(); 2616 } 2617 2618 ret = mmc_resume_host(host->mmc); 2619 sdhci_enable_card_detection(host); 2620 2621 if (host->ops->platform_resume) 2622 host->ops->platform_resume(host); 2623 2624 /* Set the re-tuning expiration flag */ 2625 if (host->flags & SDHCI_USING_RETUNING_TIMER) 2626 host->flags |= SDHCI_NEEDS_RETUNING; 2627 2628 return ret; 2629 } 2630 2631 EXPORT_SYMBOL_GPL(sdhci_resume_host); 2632 #endif /* CONFIG_PM */ 2633 2634 #ifdef CONFIG_PM_RUNTIME 2635 2636 static int sdhci_runtime_pm_get(struct sdhci_host *host) 2637 { 2638 return pm_runtime_get_sync(host->mmc->parent); 2639 } 2640 2641 static int sdhci_runtime_pm_put(struct sdhci_host *host) 2642 { 2643 pm_runtime_mark_last_busy(host->mmc->parent); 2644 return pm_runtime_put_autosuspend(host->mmc->parent); 2645 } 2646 2647 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) 2648 { 2649 if (host->runtime_suspended || host->bus_on) 2650 return; 2651 host->bus_on = true; 2652 pm_runtime_get_noresume(host->mmc->parent); 2653 } 2654 2655 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) 2656 { 2657 if (host->runtime_suspended || !host->bus_on) 2658 return; 2659 host->bus_on = false; 2660 pm_runtime_put_noidle(host->mmc->parent); 2661 } 2662 2663 int sdhci_runtime_suspend_host(struct sdhci_host *host) 2664 { 2665 unsigned long flags; 2666 int ret = 0; 2667 2668 /* Disable tuning since we are suspending */ 2669 if (host->flags & SDHCI_USING_RETUNING_TIMER) { 2670 del_timer_sync(&host->tuning_timer); 2671 host->flags &= ~SDHCI_NEEDS_RETUNING; 2672 } 2673 2674 spin_lock_irqsave(&host->lock, flags); 2675 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK); 2676 spin_unlock_irqrestore(&host->lock, flags); 2677 2678 synchronize_irq(host->irq); 2679 2680 spin_lock_irqsave(&host->lock, flags); 2681 host->runtime_suspended = true; 2682 spin_unlock_irqrestore(&host->lock, flags); 2683 2684 return ret; 2685 } 2686 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host); 2687 2688 int sdhci_runtime_resume_host(struct sdhci_host *host) 2689 { 2690 unsigned long flags; 2691 int ret = 0, host_flags = host->flags; 2692 2693 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 2694 if (host->ops->enable_dma) 2695 host->ops->enable_dma(host); 2696 } 2697 2698 sdhci_init(host, 0); 2699 2700 /* Force clock and power re-program */ 2701 host->pwr = 0; 2702 host->clock = 0; 2703 sdhci_do_set_ios(host, &host->mmc->ios); 2704 2705 sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios); 2706 if ((host_flags & SDHCI_PV_ENABLED) && 2707 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) { 2708 spin_lock_irqsave(&host->lock, flags); 2709 sdhci_enable_preset_value(host, true); 2710 spin_unlock_irqrestore(&host->lock, flags); 2711 } 2712 2713 /* Set the re-tuning expiration flag */ 2714 if (host->flags & SDHCI_USING_RETUNING_TIMER) 2715 host->flags |= SDHCI_NEEDS_RETUNING; 2716 2717 spin_lock_irqsave(&host->lock, flags); 2718 2719 host->runtime_suspended = false; 2720 2721 /* Enable SDIO IRQ */ 2722 if ((host->flags & SDHCI_SDIO_IRQ_ENABLED)) 2723 sdhci_enable_sdio_irq_nolock(host, true); 2724 2725 /* Enable Card Detection */ 2726 sdhci_enable_card_detection(host); 2727 2728 spin_unlock_irqrestore(&host->lock, flags); 2729 2730 return ret; 2731 } 2732 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host); 2733 2734 #endif 2735 2736 /*****************************************************************************\ 2737 * * 2738 * Device allocation/registration * 2739 * * 2740 \*****************************************************************************/ 2741 2742 struct sdhci_host *sdhci_alloc_host(struct device *dev, 2743 size_t priv_size) 2744 { 2745 struct mmc_host *mmc; 2746 struct sdhci_host *host; 2747 2748 WARN_ON(dev == NULL); 2749 2750 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev); 2751 if (!mmc) 2752 return ERR_PTR(-ENOMEM); 2753 2754 host = mmc_priv(mmc); 2755 host->mmc = mmc; 2756 2757 return host; 2758 } 2759 2760 EXPORT_SYMBOL_GPL(sdhci_alloc_host); 2761 2762 int sdhci_add_host(struct sdhci_host *host) 2763 { 2764 struct mmc_host *mmc; 2765 u32 caps[2] = {0, 0}; 2766 u32 max_current_caps; 2767 unsigned int ocr_avail; 2768 int ret; 2769 2770 WARN_ON(host == NULL); 2771 if (host == NULL) 2772 return -EINVAL; 2773 2774 mmc = host->mmc; 2775 2776 if (debug_quirks) 2777 host->quirks = debug_quirks; 2778 if (debug_quirks2) 2779 host->quirks2 = debug_quirks2; 2780 2781 sdhci_reset(host, SDHCI_RESET_ALL); 2782 2783 host->version = sdhci_readw(host, SDHCI_HOST_VERSION); 2784 host->version = (host->version & SDHCI_SPEC_VER_MASK) 2785 >> SDHCI_SPEC_VER_SHIFT; 2786 if (host->version > SDHCI_SPEC_300) { 2787 pr_err("%s: Unknown controller version (%d). " 2788 "You may experience problems.\n", mmc_hostname(mmc), 2789 host->version); 2790 } 2791 2792 caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps : 2793 sdhci_readl(host, SDHCI_CAPABILITIES); 2794 2795 if (host->version >= SDHCI_SPEC_300) 2796 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? 2797 host->caps1 : 2798 sdhci_readl(host, SDHCI_CAPABILITIES_1); 2799 2800 if (host->quirks & SDHCI_QUIRK_FORCE_DMA) 2801 host->flags |= SDHCI_USE_SDMA; 2802 else if (!(caps[0] & SDHCI_CAN_DO_SDMA)) 2803 DBG("Controller doesn't have SDMA capability\n"); 2804 else 2805 host->flags |= SDHCI_USE_SDMA; 2806 2807 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) && 2808 (host->flags & SDHCI_USE_SDMA)) { 2809 DBG("Disabling DMA as it is marked broken\n"); 2810 host->flags &= ~SDHCI_USE_SDMA; 2811 } 2812 2813 if ((host->version >= SDHCI_SPEC_200) && 2814 (caps[0] & SDHCI_CAN_DO_ADMA2)) 2815 host->flags |= SDHCI_USE_ADMA; 2816 2817 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) && 2818 (host->flags & SDHCI_USE_ADMA)) { 2819 DBG("Disabling ADMA as it is marked broken\n"); 2820 host->flags &= ~SDHCI_USE_ADMA; 2821 } 2822 2823 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { 2824 if (host->ops->enable_dma) { 2825 if (host->ops->enable_dma(host)) { 2826 pr_warning("%s: No suitable DMA " 2827 "available. Falling back to PIO.\n", 2828 mmc_hostname(mmc)); 2829 host->flags &= 2830 ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); 2831 } 2832 } 2833 } 2834 2835 if (host->flags & SDHCI_USE_ADMA) { 2836 /* 2837 * We need to allocate descriptors for all sg entries 2838 * (128) and potentially one alignment transfer for 2839 * each of those entries. 2840 */ 2841 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL); 2842 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL); 2843 if (!host->adma_desc || !host->align_buffer) { 2844 kfree(host->adma_desc); 2845 kfree(host->align_buffer); 2846 pr_warning("%s: Unable to allocate ADMA " 2847 "buffers. Falling back to standard DMA.\n", 2848 mmc_hostname(mmc)); 2849 host->flags &= ~SDHCI_USE_ADMA; 2850 } 2851 } 2852 2853 /* 2854 * If we use DMA, then it's up to the caller to set the DMA 2855 * mask, but PIO does not need the hw shim so we set a new 2856 * mask here in that case. 2857 */ 2858 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) { 2859 host->dma_mask = DMA_BIT_MASK(64); 2860 mmc_dev(host->mmc)->dma_mask = &host->dma_mask; 2861 } 2862 2863 if (host->version >= SDHCI_SPEC_300) 2864 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK) 2865 >> SDHCI_CLOCK_BASE_SHIFT; 2866 else 2867 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK) 2868 >> SDHCI_CLOCK_BASE_SHIFT; 2869 2870 host->max_clk *= 1000000; 2871 if (host->max_clk == 0 || host->quirks & 2872 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) { 2873 if (!host->ops->get_max_clock) { 2874 pr_err("%s: Hardware doesn't specify base clock " 2875 "frequency.\n", mmc_hostname(mmc)); 2876 return -ENODEV; 2877 } 2878 host->max_clk = host->ops->get_max_clock(host); 2879 } 2880 2881 /* 2882 * In case of Host Controller v3.00, find out whether clock 2883 * multiplier is supported. 2884 */ 2885 host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >> 2886 SDHCI_CLOCK_MUL_SHIFT; 2887 2888 /* 2889 * In case the value in Clock Multiplier is 0, then programmable 2890 * clock mode is not supported, otherwise the actual clock 2891 * multiplier is one more than the value of Clock Multiplier 2892 * in the Capabilities Register. 2893 */ 2894 if (host->clk_mul) 2895 host->clk_mul += 1; 2896 2897 /* 2898 * Set host parameters. 2899 */ 2900 mmc->ops = &sdhci_ops; 2901 mmc->f_max = host->max_clk; 2902 if (host->ops->get_min_clock) 2903 mmc->f_min = host->ops->get_min_clock(host); 2904 else if (host->version >= SDHCI_SPEC_300) { 2905 if (host->clk_mul) { 2906 mmc->f_min = (host->max_clk * host->clk_mul) / 1024; 2907 mmc->f_max = host->max_clk * host->clk_mul; 2908 } else 2909 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300; 2910 } else 2911 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200; 2912 2913 host->timeout_clk = 2914 (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT; 2915 if (host->timeout_clk == 0) { 2916 if (host->ops->get_timeout_clock) { 2917 host->timeout_clk = host->ops->get_timeout_clock(host); 2918 } else if (!(host->quirks & 2919 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) { 2920 pr_err("%s: Hardware doesn't specify timeout clock " 2921 "frequency.\n", mmc_hostname(mmc)); 2922 return -ENODEV; 2923 } 2924 } 2925 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT) 2926 host->timeout_clk *= 1000; 2927 2928 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK) 2929 host->timeout_clk = mmc->f_max / 1000; 2930 2931 mmc->max_discard_to = (1 << 27) / host->timeout_clk; 2932 2933 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23; 2934 2935 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) 2936 host->flags |= SDHCI_AUTO_CMD12; 2937 2938 /* Auto-CMD23 stuff only works in ADMA or PIO. */ 2939 if ((host->version >= SDHCI_SPEC_300) && 2940 ((host->flags & SDHCI_USE_ADMA) || 2941 !(host->flags & SDHCI_USE_SDMA))) { 2942 host->flags |= SDHCI_AUTO_CMD23; 2943 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc)); 2944 } else { 2945 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc)); 2946 } 2947 2948 /* 2949 * A controller may support 8-bit width, but the board itself 2950 * might not have the pins brought out. Boards that support 2951 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in 2952 * their platform code before calling sdhci_add_host(), and we 2953 * won't assume 8-bit width for hosts without that CAP. 2954 */ 2955 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) 2956 mmc->caps |= MMC_CAP_4_BIT_DATA; 2957 2958 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23) 2959 mmc->caps &= ~MMC_CAP_CMD23; 2960 2961 if (caps[0] & SDHCI_CAN_DO_HISPD) 2962 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; 2963 2964 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && 2965 !(host->mmc->caps & MMC_CAP_NONREMOVABLE)) 2966 mmc->caps |= MMC_CAP_NEEDS_POLL; 2967 2968 /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */ 2969 host->vqmmc = regulator_get(mmc_dev(mmc), "vqmmc"); 2970 if (IS_ERR_OR_NULL(host->vqmmc)) { 2971 if (PTR_ERR(host->vqmmc) < 0) { 2972 pr_info("%s: no vqmmc regulator found\n", 2973 mmc_hostname(mmc)); 2974 host->vqmmc = NULL; 2975 } 2976 } else { 2977 ret = regulator_enable(host->vqmmc); 2978 if (!regulator_is_supported_voltage(host->vqmmc, 1700000, 2979 1950000)) 2980 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | 2981 SDHCI_SUPPORT_SDR50 | 2982 SDHCI_SUPPORT_DDR50); 2983 if (ret) { 2984 pr_warn("%s: Failed to enable vqmmc regulator: %d\n", 2985 mmc_hostname(mmc), ret); 2986 host->vqmmc = NULL; 2987 } 2988 } 2989 2990 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) 2991 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | 2992 SDHCI_SUPPORT_DDR50); 2993 2994 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */ 2995 if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | 2996 SDHCI_SUPPORT_DDR50)) 2997 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25; 2998 2999 /* SDR104 supports also implies SDR50 support */ 3000 if (caps[1] & SDHCI_SUPPORT_SDR104) { 3001 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50; 3002 /* SD3.0: SDR104 is supported so (for eMMC) the caps2 3003 * field can be promoted to support HS200. 3004 */ 3005 mmc->caps2 |= MMC_CAP2_HS200; 3006 } else if (caps[1] & SDHCI_SUPPORT_SDR50) 3007 mmc->caps |= MMC_CAP_UHS_SDR50; 3008 3009 if (caps[1] & SDHCI_SUPPORT_DDR50) 3010 mmc->caps |= MMC_CAP_UHS_DDR50; 3011 3012 /* Does the host need tuning for SDR50? */ 3013 if (caps[1] & SDHCI_USE_SDR50_TUNING) 3014 host->flags |= SDHCI_SDR50_NEEDS_TUNING; 3015 3016 /* Does the host need tuning for SDR104 / HS200? */ 3017 if (mmc->caps2 & MMC_CAP2_HS200) 3018 host->flags |= SDHCI_SDR104_NEEDS_TUNING; 3019 3020 /* Driver Type(s) (A, C, D) supported by the host */ 3021 if (caps[1] & SDHCI_DRIVER_TYPE_A) 3022 mmc->caps |= MMC_CAP_DRIVER_TYPE_A; 3023 if (caps[1] & SDHCI_DRIVER_TYPE_C) 3024 mmc->caps |= MMC_CAP_DRIVER_TYPE_C; 3025 if (caps[1] & SDHCI_DRIVER_TYPE_D) 3026 mmc->caps |= MMC_CAP_DRIVER_TYPE_D; 3027 3028 /* Initial value for re-tuning timer count */ 3029 host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >> 3030 SDHCI_RETUNING_TIMER_COUNT_SHIFT; 3031 3032 /* 3033 * In case Re-tuning Timer is not disabled, the actual value of 3034 * re-tuning timer will be 2 ^ (n - 1). 3035 */ 3036 if (host->tuning_count) 3037 host->tuning_count = 1 << (host->tuning_count - 1); 3038 3039 /* Re-tuning mode supported by the Host Controller */ 3040 host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >> 3041 SDHCI_RETUNING_MODE_SHIFT; 3042 3043 ocr_avail = 0; 3044 3045 host->vmmc = regulator_get(mmc_dev(mmc), "vmmc"); 3046 if (IS_ERR_OR_NULL(host->vmmc)) { 3047 if (PTR_ERR(host->vmmc) < 0) { 3048 pr_info("%s: no vmmc regulator found\n", 3049 mmc_hostname(mmc)); 3050 host->vmmc = NULL; 3051 } 3052 } 3053 3054 #ifdef CONFIG_REGULATOR 3055 /* 3056 * Voltage range check makes sense only if regulator reports 3057 * any voltage value. 3058 */ 3059 if (host->vmmc && regulator_get_voltage(host->vmmc) > 0) { 3060 ret = regulator_is_supported_voltage(host->vmmc, 2700000, 3061 3600000); 3062 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330))) 3063 caps[0] &= ~SDHCI_CAN_VDD_330; 3064 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300))) 3065 caps[0] &= ~SDHCI_CAN_VDD_300; 3066 ret = regulator_is_supported_voltage(host->vmmc, 1700000, 3067 1950000); 3068 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180))) 3069 caps[0] &= ~SDHCI_CAN_VDD_180; 3070 } 3071 #endif /* CONFIG_REGULATOR */ 3072 3073 /* 3074 * According to SD Host Controller spec v3.00, if the Host System 3075 * can afford more than 150mA, Host Driver should set XPC to 1. Also 3076 * the value is meaningful only if Voltage Support in the Capabilities 3077 * register is set. The actual current value is 4 times the register 3078 * value. 3079 */ 3080 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT); 3081 if (!max_current_caps && host->vmmc) { 3082 u32 curr = regulator_get_current_limit(host->vmmc); 3083 if (curr > 0) { 3084 3085 /* convert to SDHCI_MAX_CURRENT format */ 3086 curr = curr/1000; /* convert to mA */ 3087 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER; 3088 3089 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT); 3090 max_current_caps = 3091 (curr << SDHCI_MAX_CURRENT_330_SHIFT) | 3092 (curr << SDHCI_MAX_CURRENT_300_SHIFT) | 3093 (curr << SDHCI_MAX_CURRENT_180_SHIFT); 3094 } 3095 } 3096 3097 if (caps[0] & SDHCI_CAN_VDD_330) { 3098 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34; 3099 3100 mmc->max_current_330 = ((max_current_caps & 3101 SDHCI_MAX_CURRENT_330_MASK) >> 3102 SDHCI_MAX_CURRENT_330_SHIFT) * 3103 SDHCI_MAX_CURRENT_MULTIPLIER; 3104 } 3105 if (caps[0] & SDHCI_CAN_VDD_300) { 3106 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31; 3107 3108 mmc->max_current_300 = ((max_current_caps & 3109 SDHCI_MAX_CURRENT_300_MASK) >> 3110 SDHCI_MAX_CURRENT_300_SHIFT) * 3111 SDHCI_MAX_CURRENT_MULTIPLIER; 3112 } 3113 if (caps[0] & SDHCI_CAN_VDD_180) { 3114 ocr_avail |= MMC_VDD_165_195; 3115 3116 mmc->max_current_180 = ((max_current_caps & 3117 SDHCI_MAX_CURRENT_180_MASK) >> 3118 SDHCI_MAX_CURRENT_180_SHIFT) * 3119 SDHCI_MAX_CURRENT_MULTIPLIER; 3120 } 3121 3122 mmc->ocr_avail = ocr_avail; 3123 mmc->ocr_avail_sdio = ocr_avail; 3124 if (host->ocr_avail_sdio) 3125 mmc->ocr_avail_sdio &= host->ocr_avail_sdio; 3126 mmc->ocr_avail_sd = ocr_avail; 3127 if (host->ocr_avail_sd) 3128 mmc->ocr_avail_sd &= host->ocr_avail_sd; 3129 else /* normal SD controllers don't support 1.8V */ 3130 mmc->ocr_avail_sd &= ~MMC_VDD_165_195; 3131 mmc->ocr_avail_mmc = ocr_avail; 3132 if (host->ocr_avail_mmc) 3133 mmc->ocr_avail_mmc &= host->ocr_avail_mmc; 3134 3135 if (mmc->ocr_avail == 0) { 3136 pr_err("%s: Hardware doesn't report any " 3137 "support voltages.\n", mmc_hostname(mmc)); 3138 return -ENODEV; 3139 } 3140 3141 spin_lock_init(&host->lock); 3142 3143 /* 3144 * Maximum number of segments. Depends on if the hardware 3145 * can do scatter/gather or not. 3146 */ 3147 if (host->flags & SDHCI_USE_ADMA) 3148 mmc->max_segs = 128; 3149 else if (host->flags & SDHCI_USE_SDMA) 3150 mmc->max_segs = 1; 3151 else /* PIO */ 3152 mmc->max_segs = 128; 3153 3154 /* 3155 * Maximum number of sectors in one transfer. Limited by DMA boundary 3156 * size (512KiB). 3157 */ 3158 mmc->max_req_size = 524288; 3159 3160 /* 3161 * Maximum segment size. Could be one segment with the maximum number 3162 * of bytes. When doing hardware scatter/gather, each entry cannot 3163 * be larger than 64 KiB though. 3164 */ 3165 if (host->flags & SDHCI_USE_ADMA) { 3166 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC) 3167 mmc->max_seg_size = 65535; 3168 else 3169 mmc->max_seg_size = 65536; 3170 } else { 3171 mmc->max_seg_size = mmc->max_req_size; 3172 } 3173 3174 /* 3175 * Maximum block size. This varies from controller to controller and 3176 * is specified in the capabilities register. 3177 */ 3178 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) { 3179 mmc->max_blk_size = 2; 3180 } else { 3181 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >> 3182 SDHCI_MAX_BLOCK_SHIFT; 3183 if (mmc->max_blk_size >= 3) { 3184 pr_warning("%s: Invalid maximum block size, " 3185 "assuming 512 bytes\n", mmc_hostname(mmc)); 3186 mmc->max_blk_size = 0; 3187 } 3188 } 3189 3190 mmc->max_blk_size = 512 << mmc->max_blk_size; 3191 3192 /* 3193 * Maximum block count. 3194 */ 3195 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535; 3196 3197 /* 3198 * Init tasklets. 3199 */ 3200 tasklet_init(&host->card_tasklet, 3201 sdhci_tasklet_card, (unsigned long)host); 3202 tasklet_init(&host->finish_tasklet, 3203 sdhci_tasklet_finish, (unsigned long)host); 3204 3205 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host); 3206 3207 if (host->version >= SDHCI_SPEC_300) { 3208 init_waitqueue_head(&host->buf_ready_int); 3209 3210 /* Initialize re-tuning timer */ 3211 init_timer(&host->tuning_timer); 3212 host->tuning_timer.data = (unsigned long)host; 3213 host->tuning_timer.function = sdhci_tuning_timer; 3214 } 3215 3216 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED, 3217 mmc_hostname(mmc), host); 3218 if (ret) { 3219 pr_err("%s: Failed to request IRQ %d: %d\n", 3220 mmc_hostname(mmc), host->irq, ret); 3221 goto untasklet; 3222 } 3223 3224 sdhci_init(host, 0); 3225 3226 #ifdef CONFIG_MMC_DEBUG 3227 sdhci_dumpregs(host); 3228 #endif 3229 3230 #ifdef SDHCI_USE_LEDS_CLASS 3231 snprintf(host->led_name, sizeof(host->led_name), 3232 "%s::", mmc_hostname(mmc)); 3233 host->led.name = host->led_name; 3234 host->led.brightness = LED_OFF; 3235 host->led.default_trigger = mmc_hostname(mmc); 3236 host->led.brightness_set = sdhci_led_control; 3237 3238 ret = led_classdev_register(mmc_dev(mmc), &host->led); 3239 if (ret) { 3240 pr_err("%s: Failed to register LED device: %d\n", 3241 mmc_hostname(mmc), ret); 3242 goto reset; 3243 } 3244 #endif 3245 3246 mmiowb(); 3247 3248 mmc_add_host(mmc); 3249 3250 pr_info("%s: SDHCI controller on %s [%s] using %s\n", 3251 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)), 3252 (host->flags & SDHCI_USE_ADMA) ? "ADMA" : 3253 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO"); 3254 3255 sdhci_enable_card_detection(host); 3256 3257 return 0; 3258 3259 #ifdef SDHCI_USE_LEDS_CLASS 3260 reset: 3261 sdhci_reset(host, SDHCI_RESET_ALL); 3262 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK); 3263 free_irq(host->irq, host); 3264 #endif 3265 untasklet: 3266 tasklet_kill(&host->card_tasklet); 3267 tasklet_kill(&host->finish_tasklet); 3268 3269 return ret; 3270 } 3271 3272 EXPORT_SYMBOL_GPL(sdhci_add_host); 3273 3274 void sdhci_remove_host(struct sdhci_host *host, int dead) 3275 { 3276 unsigned long flags; 3277 3278 if (dead) { 3279 spin_lock_irqsave(&host->lock, flags); 3280 3281 host->flags |= SDHCI_DEVICE_DEAD; 3282 3283 if (host->mrq) { 3284 pr_err("%s: Controller removed during " 3285 " transfer!\n", mmc_hostname(host->mmc)); 3286 3287 host->mrq->cmd->error = -ENOMEDIUM; 3288 tasklet_schedule(&host->finish_tasklet); 3289 } 3290 3291 spin_unlock_irqrestore(&host->lock, flags); 3292 } 3293 3294 sdhci_disable_card_detection(host); 3295 3296 mmc_remove_host(host->mmc); 3297 3298 #ifdef SDHCI_USE_LEDS_CLASS 3299 led_classdev_unregister(&host->led); 3300 #endif 3301 3302 if (!dead) 3303 sdhci_reset(host, SDHCI_RESET_ALL); 3304 3305 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK); 3306 free_irq(host->irq, host); 3307 3308 del_timer_sync(&host->timer); 3309 3310 tasklet_kill(&host->card_tasklet); 3311 tasklet_kill(&host->finish_tasklet); 3312 3313 if (host->vmmc) { 3314 regulator_disable(host->vmmc); 3315 regulator_put(host->vmmc); 3316 } 3317 3318 if (host->vqmmc) { 3319 regulator_disable(host->vqmmc); 3320 regulator_put(host->vqmmc); 3321 } 3322 3323 kfree(host->adma_desc); 3324 kfree(host->align_buffer); 3325 3326 host->adma_desc = NULL; 3327 host->align_buffer = NULL; 3328 } 3329 3330 EXPORT_SYMBOL_GPL(sdhci_remove_host); 3331 3332 void sdhci_free_host(struct sdhci_host *host) 3333 { 3334 mmc_free_host(host->mmc); 3335 } 3336 3337 EXPORT_SYMBOL_GPL(sdhci_free_host); 3338 3339 /*****************************************************************************\ 3340 * * 3341 * Driver init/exit * 3342 * * 3343 \*****************************************************************************/ 3344 3345 static int __init sdhci_drv_init(void) 3346 { 3347 pr_info(DRIVER_NAME 3348 ": Secure Digital Host Controller Interface driver\n"); 3349 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); 3350 3351 return 0; 3352 } 3353 3354 static void __exit sdhci_drv_exit(void) 3355 { 3356 } 3357 3358 module_init(sdhci_drv_init); 3359 module_exit(sdhci_drv_exit); 3360 3361 module_param(debug_quirks, uint, 0444); 3362 module_param(debug_quirks2, uint, 0444); 3363 3364 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); 3365 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver"); 3366 MODULE_LICENSE("GPL"); 3367 3368 MODULE_PARM_DESC(debug_quirks, "Force certain quirks."); 3369 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks."); 3370