1/* 2 * linux/drivers/mmc/sdio.c 3 * 4 * Copyright 2006-2007 Pierre Ossman 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 12#include <linux/err.h> 13#include <linux/pm_runtime.h> 14 15#include <linux/mmc/host.h> 16#include <linux/mmc/card.h> 17#include <linux/mmc/mmc.h> 18#include <linux/mmc/sdio.h> 19#include <linux/mmc/sdio_func.h> 20#include <linux/mmc/sdio_ids.h> 21 22#include "core.h" 23#include "bus.h" 24#include "sd.h" 25#include "sdio_bus.h" 26#include "mmc_ops.h" 27#include "sd_ops.h" 28#include "sdio_ops.h" 29#include "sdio_cis.h" 30 31static int sdio_read_fbr(struct sdio_func *func) 32{ 33 int ret; 34 unsigned char data; 35 36 if (mmc_card_nonstd_func_interface(func->card)) { 37 func->class = SDIO_CLASS_NONE; 38 return 0; 39 } 40 41 ret = mmc_io_rw_direct(func->card, 0, 0, 42 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); 43 if (ret) 44 goto out; 45 46 data &= 0x0f; 47 48 if (data == 0x0f) { 49 ret = mmc_io_rw_direct(func->card, 0, 0, 50 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); 51 if (ret) 52 goto out; 53 } 54 55 func->class = data; 56 57out: 58 return ret; 59} 60 61static int sdio_init_func(struct mmc_card *card, unsigned int fn) 62{ 63 int ret; 64 struct sdio_func *func; 65 66 BUG_ON(fn > SDIO_MAX_FUNCS); 67 68 func = sdio_alloc_func(card); 69 if (IS_ERR(func)) 70 return PTR_ERR(func); 71 72 func->num = fn; 73 74 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) { 75 ret = sdio_read_fbr(func); 76 if (ret) 77 goto fail; 78 79 ret = sdio_read_func_cis(func); 80 if (ret) 81 goto fail; 82 } else { 83 func->vendor = func->card->cis.vendor; 84 func->device = func->card->cis.device; 85 func->max_blksize = func->card->cis.blksize; 86 } 87 88 card->sdio_func[fn - 1] = func; 89 90 return 0; 91 92fail: 93 /* 94 * It is okay to remove the function here even though we hold 95 * the host lock as we haven't registered the device yet. 96 */ 97 sdio_remove_func(func); 98 return ret; 99} 100 101static int sdio_read_cccr(struct mmc_card *card, u32 ocr) 102{ 103 int ret; 104 int cccr_vsn; 105 int uhs = ocr & R4_18V_PRESENT; 106 unsigned char data; 107 unsigned char speed; 108 109 memset(&card->cccr, 0, sizeof(struct sdio_cccr)); 110 111 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); 112 if (ret) 113 goto out; 114 115 cccr_vsn = data & 0x0f; 116 117 if (cccr_vsn > SDIO_CCCR_REV_3_00) { 118 pr_err("%s: unrecognised CCCR structure version %d\n", 119 mmc_hostname(card->host), cccr_vsn); 120 return -EINVAL; 121 } 122 123 card->cccr.sdio_vsn = (data & 0xf0) >> 4; 124 125 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); 126 if (ret) 127 goto out; 128 129 if (data & SDIO_CCCR_CAP_SMB) 130 card->cccr.multi_block = 1; 131 if (data & SDIO_CCCR_CAP_LSC) 132 card->cccr.low_speed = 1; 133 if (data & SDIO_CCCR_CAP_4BLS) 134 card->cccr.wide_bus = 1; 135 136 if (cccr_vsn >= SDIO_CCCR_REV_1_10) { 137 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); 138 if (ret) 139 goto out; 140 141 if (data & SDIO_POWER_SMPC) 142 card->cccr.high_power = 1; 143 } 144 145 if (cccr_vsn >= SDIO_CCCR_REV_1_20) { 146 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 147 if (ret) 148 goto out; 149 150 card->scr.sda_spec3 = 0; 151 card->sw_caps.sd3_bus_mode = 0; 152 card->sw_caps.sd3_drv_type = 0; 153 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) { 154 card->scr.sda_spec3 = 1; 155 ret = mmc_io_rw_direct(card, 0, 0, 156 SDIO_CCCR_UHS, 0, &data); 157 if (ret) 158 goto out; 159 160 if (mmc_host_uhs(card->host)) { 161 if (data & SDIO_UHS_DDR50) 162 card->sw_caps.sd3_bus_mode 163 |= SD_MODE_UHS_DDR50; 164 165 if (data & SDIO_UHS_SDR50) 166 card->sw_caps.sd3_bus_mode 167 |= SD_MODE_UHS_SDR50; 168 169 if (data & SDIO_UHS_SDR104) 170 card->sw_caps.sd3_bus_mode 171 |= SD_MODE_UHS_SDR104; 172 } 173 174 ret = mmc_io_rw_direct(card, 0, 0, 175 SDIO_CCCR_DRIVE_STRENGTH, 0, &data); 176 if (ret) 177 goto out; 178 179 if (data & SDIO_DRIVE_SDTA) 180 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; 181 if (data & SDIO_DRIVE_SDTC) 182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; 183 if (data & SDIO_DRIVE_SDTD) 184 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; 185 } 186 187 /* if no uhs mode ensure we check for high speed */ 188 if (!card->sw_caps.sd3_bus_mode) { 189 if (speed & SDIO_SPEED_SHS) { 190 card->cccr.high_speed = 1; 191 card->sw_caps.hs_max_dtr = 50000000; 192 } else { 193 card->cccr.high_speed = 0; 194 card->sw_caps.hs_max_dtr = 25000000; 195 } 196 } 197 } 198 199out: 200 return ret; 201} 202 203static int sdio_enable_wide(struct mmc_card *card) 204{ 205 int ret; 206 u8 ctrl; 207 208 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 209 return 0; 210 211 if (card->cccr.low_speed && !card->cccr.wide_bus) 212 return 0; 213 214 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 215 if (ret) 216 return ret; 217 218 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) 219 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", 220 mmc_hostname(card->host), ctrl); 221 222 /* set as 4-bit bus width */ 223 ctrl &= ~SDIO_BUS_WIDTH_MASK; 224 ctrl |= SDIO_BUS_WIDTH_4BIT; 225 226 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 227 if (ret) 228 return ret; 229 230 return 1; 231} 232 233/* 234 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) 235 * of the card. This may be required on certain setups of boards, 236 * controllers and embedded sdio device which do not need the card's 237 * pull-up. As a result, card detection is disabled and power is saved. 238 */ 239static int sdio_disable_cd(struct mmc_card *card) 240{ 241 int ret; 242 u8 ctrl; 243 244 if (!mmc_card_disable_cd(card)) 245 return 0; 246 247 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 248 if (ret) 249 return ret; 250 251 ctrl |= SDIO_BUS_CD_DISABLE; 252 253 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 254} 255 256/* 257 * Devices that remain active during a system suspend are 258 * put back into 1-bit mode. 259 */ 260static int sdio_disable_wide(struct mmc_card *card) 261{ 262 int ret; 263 u8 ctrl; 264 265 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 266 return 0; 267 268 if (card->cccr.low_speed && !card->cccr.wide_bus) 269 return 0; 270 271 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 272 if (ret) 273 return ret; 274 275 if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) 276 return 0; 277 278 ctrl &= ~SDIO_BUS_WIDTH_4BIT; 279 ctrl |= SDIO_BUS_ASYNC_INT; 280 281 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 282 if (ret) 283 return ret; 284 285 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); 286 287 return 0; 288} 289 290 291static int sdio_enable_4bit_bus(struct mmc_card *card) 292{ 293 int err; 294 295 if (card->type == MMC_TYPE_SDIO) 296 err = sdio_enable_wide(card); 297 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 298 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 299 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 300 if (err) 301 return err; 302 err = sdio_enable_wide(card); 303 if (err <= 0) 304 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); 305 } else 306 return 0; 307 308 if (err > 0) { 309 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 310 err = 0; 311 } 312 313 return err; 314} 315 316 317/* 318 * Test if the card supports high-speed mode and, if so, switch to it. 319 */ 320static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) 321{ 322 int ret; 323 u8 speed; 324 325 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 326 return 0; 327 328 if (!card->cccr.high_speed) 329 return 0; 330 331 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 332 if (ret) 333 return ret; 334 335 if (enable) 336 speed |= SDIO_SPEED_EHS; 337 else 338 speed &= ~SDIO_SPEED_EHS; 339 340 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 341 if (ret) 342 return ret; 343 344 return 1; 345} 346 347/* 348 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. 349 */ 350static int sdio_enable_hs(struct mmc_card *card) 351{ 352 int ret; 353 354 ret = mmc_sdio_switch_hs(card, true); 355 if (ret <= 0 || card->type == MMC_TYPE_SDIO) 356 return ret; 357 358 ret = mmc_sd_switch_hs(card); 359 if (ret <= 0) 360 mmc_sdio_switch_hs(card, false); 361 362 return ret; 363} 364 365static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) 366{ 367 unsigned max_dtr; 368 369 if (mmc_card_hs(card)) { 370 /* 371 * The SDIO specification doesn't mention how 372 * the CIS transfer speed register relates to 373 * high-speed, but it seems that 50 MHz is 374 * mandatory. 375 */ 376 max_dtr = 50000000; 377 } else { 378 max_dtr = card->cis.max_dtr; 379 } 380 381 if (card->type == MMC_TYPE_SD_COMBO) 382 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); 383 384 return max_dtr; 385} 386 387static unsigned char host_drive_to_sdio_drive(int host_strength) 388{ 389 switch (host_strength) { 390 case MMC_SET_DRIVER_TYPE_A: 391 return SDIO_DTSx_SET_TYPE_A; 392 case MMC_SET_DRIVER_TYPE_B: 393 return SDIO_DTSx_SET_TYPE_B; 394 case MMC_SET_DRIVER_TYPE_C: 395 return SDIO_DTSx_SET_TYPE_C; 396 case MMC_SET_DRIVER_TYPE_D: 397 return SDIO_DTSx_SET_TYPE_D; 398 default: 399 return SDIO_DTSx_SET_TYPE_B; 400 } 401} 402 403static void sdio_select_driver_type(struct mmc_card *card) 404{ 405 int host_drv_type = SD_DRIVER_TYPE_B; 406 int card_drv_type = SD_DRIVER_TYPE_B; 407 int drive_strength; 408 unsigned char card_strength; 409 int err; 410 411 /* 412 * If the host doesn't support any of the Driver Types A,C or D, 413 * or there is no board specific handler then default Driver 414 * Type B is used. 415 */ 416 if (!(card->host->caps & 417 (MMC_CAP_DRIVER_TYPE_A | 418 MMC_CAP_DRIVER_TYPE_C | 419 MMC_CAP_DRIVER_TYPE_D))) 420 return; 421 422 if (!card->host->ops->select_drive_strength) 423 return; 424 425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 426 host_drv_type |= SD_DRIVER_TYPE_A; 427 428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 429 host_drv_type |= SD_DRIVER_TYPE_C; 430 431 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 432 host_drv_type |= SD_DRIVER_TYPE_D; 433 434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 435 card_drv_type |= SD_DRIVER_TYPE_A; 436 437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 438 card_drv_type |= SD_DRIVER_TYPE_C; 439 440 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 441 card_drv_type |= SD_DRIVER_TYPE_D; 442 443 /* 444 * The drive strength that the hardware can support 445 * depends on the board design. Pass the appropriate 446 * information and let the hardware specific code 447 * return what is possible given the options 448 */ 449 drive_strength = card->host->ops->select_drive_strength( 450 card->sw_caps.uhs_max_dtr, 451 host_drv_type, card_drv_type); 452 453 /* if error just use default for drive strength B */ 454 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, 455 &card_strength); 456 if (err) 457 return; 458 459 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); 460 card_strength |= host_drive_to_sdio_drive(drive_strength); 461 462 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, 463 card_strength, NULL); 464 465 /* if error default to drive strength B */ 466 if (!err) 467 mmc_set_driver_type(card->host, drive_strength); 468} 469 470 471static int sdio_set_bus_speed_mode(struct mmc_card *card) 472{ 473 unsigned int bus_speed, timing; 474 int err; 475 unsigned char speed; 476 477 /* 478 * If the host doesn't support any of the UHS-I modes, fallback on 479 * default speed. 480 */ 481 if (!mmc_host_uhs(card->host)) 482 return 0; 483 484 bus_speed = SDIO_SPEED_SDR12; 485 timing = MMC_TIMING_UHS_SDR12; 486 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 487 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 488 bus_speed = SDIO_SPEED_SDR104; 489 timing = MMC_TIMING_UHS_SDR104; 490 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 491 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 492 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 494 bus_speed = SDIO_SPEED_DDR50; 495 timing = MMC_TIMING_UHS_DDR50; 496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 497 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 498 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 499 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 500 SD_MODE_UHS_SDR50)) { 501 bus_speed = SDIO_SPEED_SDR50; 502 timing = MMC_TIMING_UHS_SDR50; 503 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 504 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 505 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 506 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 507 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 508 bus_speed = SDIO_SPEED_SDR25; 509 timing = MMC_TIMING_UHS_SDR25; 510 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 511 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 512 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 513 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 514 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 515 SD_MODE_UHS_SDR12)) { 516 bus_speed = SDIO_SPEED_SDR12; 517 timing = MMC_TIMING_UHS_SDR12; 518 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 519 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 520 } 521 522 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 523 if (err) 524 return err; 525 526 speed &= ~SDIO_SPEED_BSS_MASK; 527 speed |= bus_speed; 528 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 529 if (err) 530 return err; 531 532 if (bus_speed) { 533 mmc_set_timing(card->host, timing); 534 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 535 } 536 537 return 0; 538} 539 540/* 541 * UHS-I specific initialization procedure 542 */ 543static int mmc_sdio_init_uhs_card(struct mmc_card *card) 544{ 545 int err; 546 547 if (!card->scr.sda_spec3) 548 return 0; 549 550 /* 551 * Switch to wider bus (if supported). 552 */ 553 if (card->host->caps & MMC_CAP_4_BIT_DATA) 554 err = sdio_enable_4bit_bus(card); 555 556 /* Set the driver strength for the card */ 557 sdio_select_driver_type(card); 558 559 /* Set bus speed mode of the card */ 560 err = sdio_set_bus_speed_mode(card); 561 if (err) 562 goto out; 563 564 /* 565 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 566 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 567 */ 568 if (!mmc_host_is_spi(card->host) && 569 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) || 570 (card->host->ios.timing == MMC_TIMING_UHS_SDR104))) 571 err = mmc_execute_tuning(card); 572out: 573 return err; 574} 575 576/* 577 * Handle the detection and initialisation of a card. 578 * 579 * In the case of a resume, "oldcard" will contain the card 580 * we're trying to reinitialise. 581 */ 582static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 583 struct mmc_card *oldcard, int powered_resume) 584{ 585 struct mmc_card *card; 586 int err; 587 int retries = 10; 588 u32 rocr = 0; 589 u32 ocr_card = ocr; 590 591 BUG_ON(!host); 592 WARN_ON(!host->claimed); 593 594 /* to query card if 1.8V signalling is supported */ 595 if (mmc_host_uhs(host)) 596 ocr |= R4_18V_PRESENT; 597 598try_again: 599 if (!retries) { 600 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 601 ocr &= ~R4_18V_PRESENT; 602 } 603 604 /* 605 * Inform the card of the voltage 606 */ 607 if (!powered_resume) { 608 err = mmc_send_io_op_cond(host, ocr, &rocr); 609 if (err) 610 goto err; 611 } 612 613 /* 614 * For SPI, enable CRC as appropriate. 615 */ 616 if (mmc_host_is_spi(host)) { 617 err = mmc_spi_set_crc(host, use_spi_crc); 618 if (err) 619 goto err; 620 } 621 622 /* 623 * Allocate card structure. 624 */ 625 card = mmc_alloc_card(host, NULL); 626 if (IS_ERR(card)) { 627 err = PTR_ERR(card); 628 goto err; 629 } 630 631 if ((rocr & R4_MEMORY_PRESENT) && 632 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { 633 card->type = MMC_TYPE_SD_COMBO; 634 635 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || 636 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { 637 mmc_remove_card(card); 638 return -ENOENT; 639 } 640 } else { 641 card->type = MMC_TYPE_SDIO; 642 643 if (oldcard && oldcard->type != MMC_TYPE_SDIO) { 644 mmc_remove_card(card); 645 return -ENOENT; 646 } 647 } 648 649 /* 650 * Call the optional HC's init_card function to handle quirks. 651 */ 652 if (host->ops->init_card) 653 host->ops->init_card(host, card); 654 655 /* 656 * If the host and card support UHS-I mode request the card 657 * to switch to 1.8V signaling level. No 1.8v signalling if 658 * UHS mode is not enabled to maintain compatibility and some 659 * systems that claim 1.8v signalling in fact do not support 660 * it. 661 */ 662 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) { 663 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 664 ocr_card); 665 if (err == -EAGAIN) { 666 sdio_reset(host); 667 mmc_go_idle(host); 668 mmc_send_if_cond(host, host->ocr_avail); 669 mmc_remove_card(card); 670 retries--; 671 goto try_again; 672 } else if (err) { 673 ocr &= ~R4_18V_PRESENT; 674 } 675 err = 0; 676 } else { 677 ocr &= ~R4_18V_PRESENT; 678 } 679 680 /* 681 * For native busses: set card RCA and quit open drain mode. 682 */ 683 if (!powered_resume && !mmc_host_is_spi(host)) { 684 err = mmc_send_relative_addr(host, &card->rca); 685 if (err) 686 goto remove; 687 688 /* 689 * Update oldcard with the new RCA received from the SDIO 690 * device -- we're doing this so that it's updated in the 691 * "card" struct when oldcard overwrites that later. 692 */ 693 if (oldcard) 694 oldcard->rca = card->rca; 695 } 696 697 /* 698 * Read CSD, before selecting the card 699 */ 700 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { 701 err = mmc_sd_get_csd(host, card); 702 if (err) 703 return err; 704 705 mmc_decode_cid(card); 706 } 707 708 /* 709 * Select card, as all following commands rely on that. 710 */ 711 if (!powered_resume && !mmc_host_is_spi(host)) { 712 err = mmc_select_card(card); 713 if (err) 714 goto remove; 715 } 716 717 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { 718 /* 719 * This is non-standard SDIO device, meaning it doesn't 720 * have any CIA (Common I/O area) registers present. 721 * It's host's responsibility to fill cccr and cis 722 * structures in init_card(). 723 */ 724 mmc_set_clock(host, card->cis.max_dtr); 725 726 if (card->cccr.high_speed) { 727 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 728 } 729 730 goto finish; 731 } 732 733 /* 734 * Read the common registers. 735 */ 736 err = sdio_read_cccr(card, ocr); 737 if (err) 738 goto remove; 739 740 /* 741 * Read the common CIS tuples. 742 */ 743 err = sdio_read_common_cis(card); 744 if (err) 745 goto remove; 746 747 if (oldcard) { 748 int same = (card->cis.vendor == oldcard->cis.vendor && 749 card->cis.device == oldcard->cis.device); 750 mmc_remove_card(card); 751 if (!same) 752 return -ENOENT; 753 754 card = oldcard; 755 } 756 card->ocr = ocr_card; 757 mmc_fixup_device(card, NULL); 758 759 if (card->type == MMC_TYPE_SD_COMBO) { 760 err = mmc_sd_setup_card(host, card, oldcard != NULL); 761 /* handle as SDIO-only card if memory init failed */ 762 if (err) { 763 mmc_go_idle(host); 764 if (mmc_host_is_spi(host)) 765 /* should not fail, as it worked previously */ 766 mmc_spi_set_crc(host, use_spi_crc); 767 card->type = MMC_TYPE_SDIO; 768 } else 769 card->dev.type = &sd_type; 770 } 771 772 /* 773 * If needed, disconnect card detection pull-up resistor. 774 */ 775 err = sdio_disable_cd(card); 776 if (err) 777 goto remove; 778 779 /* Initialization sequence for UHS-I cards */ 780 /* Only if card supports 1.8v and UHS signaling */ 781 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { 782 err = mmc_sdio_init_uhs_card(card); 783 if (err) 784 goto remove; 785 } else { 786 /* 787 * Switch to high-speed (if supported). 788 */ 789 err = sdio_enable_hs(card); 790 if (err > 0) 791 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 792 else if (err) 793 goto remove; 794 795 /* 796 * Change to the card's maximum speed. 797 */ 798 mmc_set_clock(host, mmc_sdio_get_max_clock(card)); 799 800 /* 801 * Switch to wider bus (if supported). 802 */ 803 err = sdio_enable_4bit_bus(card); 804 if (err) 805 goto remove; 806 } 807finish: 808 if (!oldcard) 809 host->card = card; 810 return 0; 811 812remove: 813 if (!oldcard) 814 mmc_remove_card(card); 815 816err: 817 return err; 818} 819 820/* 821 * Host is being removed. Free up the current card. 822 */ 823static void mmc_sdio_remove(struct mmc_host *host) 824{ 825 int i; 826 827 BUG_ON(!host); 828 BUG_ON(!host->card); 829 830 for (i = 0;i < host->card->sdio_funcs;i++) { 831 if (host->card->sdio_func[i]) { 832 sdio_remove_func(host->card->sdio_func[i]); 833 host->card->sdio_func[i] = NULL; 834 } 835 } 836 837 mmc_remove_card(host->card); 838 host->card = NULL; 839} 840 841/* 842 * Card detection - card is alive. 843 */ 844static int mmc_sdio_alive(struct mmc_host *host) 845{ 846 return mmc_select_card(host->card); 847} 848 849/* 850 * Card detection callback from host. 851 */ 852static void mmc_sdio_detect(struct mmc_host *host) 853{ 854 int err; 855 856 BUG_ON(!host); 857 BUG_ON(!host->card); 858 859 /* Make sure card is powered before detecting it */ 860 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 861 err = pm_runtime_get_sync(&host->card->dev); 862 if (err < 0) { 863 pm_runtime_put_noidle(&host->card->dev); 864 goto out; 865 } 866 } 867 868 mmc_claim_host(host); 869 870 /* 871 * Just check if our card has been removed. 872 */ 873 err = _mmc_detect_card_removed(host); 874 875 mmc_release_host(host); 876 877 /* 878 * Tell PM core it's OK to power off the card now. 879 * 880 * The _sync variant is used in order to ensure that the card 881 * is left powered off in case an error occurred, and the card 882 * is going to be removed. 883 * 884 * Since there is no specific reason to believe a new user 885 * is about to show up at this point, the _sync variant is 886 * desirable anyway. 887 */ 888 if (host->caps & MMC_CAP_POWER_OFF_CARD) 889 pm_runtime_put_sync(&host->card->dev); 890 891out: 892 if (err) { 893 mmc_sdio_remove(host); 894 895 mmc_claim_host(host); 896 mmc_detach_bus(host); 897 mmc_power_off(host); 898 mmc_release_host(host); 899 } 900} 901 902/* 903 * SDIO pre_suspend. We need to suspend all functions separately. 904 * Therefore all registered functions must have drivers with suspend 905 * and resume methods. Failing that we simply remove the whole card. 906 */ 907static int mmc_sdio_pre_suspend(struct mmc_host *host) 908{ 909 int i, err = 0; 910 911 for (i = 0; i < host->card->sdio_funcs; i++) { 912 struct sdio_func *func = host->card->sdio_func[i]; 913 if (func && sdio_func_present(func) && func->dev.driver) { 914 const struct dev_pm_ops *pmops = func->dev.driver->pm; 915 if (!pmops || !pmops->suspend || !pmops->resume) { 916 /* force removal of entire card in that case */ 917 err = -ENOSYS; 918 break; 919 } 920 } 921 } 922 923 return err; 924} 925 926/* 927 * SDIO suspend. Suspend all functions separately. 928 */ 929static int mmc_sdio_suspend(struct mmc_host *host) 930{ 931 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { 932 mmc_claim_host(host); 933 sdio_disable_wide(host->card); 934 mmc_release_host(host); 935 } 936 937 if (!mmc_card_keep_power(host)) 938 mmc_power_off(host); 939 940 return 0; 941} 942 943static int mmc_sdio_resume(struct mmc_host *host) 944{ 945 int err = 0; 946 947 BUG_ON(!host); 948 BUG_ON(!host->card); 949 950 /* Basic card reinitialization. */ 951 mmc_claim_host(host); 952 953 /* Restore power if needed */ 954 if (!mmc_card_keep_power(host)) { 955 mmc_power_up(host, host->card->ocr); 956 /* 957 * Tell runtime PM core we just powered up the card, 958 * since it still believes the card is powered off. 959 * Note that currently runtime PM is only enabled 960 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD 961 */ 962 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 963 pm_runtime_disable(&host->card->dev); 964 pm_runtime_set_active(&host->card->dev); 965 pm_runtime_enable(&host->card->dev); 966 } 967 } 968 969 /* No need to reinitialize powered-resumed nonremovable cards */ 970 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) { 971 sdio_reset(host); 972 mmc_go_idle(host); 973 mmc_send_if_cond(host, host->card->ocr); 974 err = mmc_send_io_op_cond(host, 0, NULL); 975 if (!err) 976 err = mmc_sdio_init_card(host, host->card->ocr, 977 host->card, 978 mmc_card_keep_power(host)); 979 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { 980 /* We may have switched to 1-bit mode during suspend */ 981 err = sdio_enable_4bit_bus(host->card); 982 } 983 984 if (!err && host->sdio_irqs) { 985 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) { 986 wake_up_process(host->sdio_irq_thread); 987 } else if (host->caps & MMC_CAP_SDIO_IRQ) { 988 mmc_host_clk_hold(host); 989 host->ops->enable_sdio_irq(host, 1); 990 mmc_host_clk_release(host); 991 } 992 } 993 994 mmc_release_host(host); 995 996 host->pm_flags &= ~MMC_PM_KEEP_POWER; 997 return err; 998} 999 1000static int mmc_sdio_power_restore(struct mmc_host *host) 1001{ 1002 int ret; 1003 1004 BUG_ON(!host); 1005 BUG_ON(!host->card); 1006 1007 mmc_claim_host(host); 1008 1009 /* 1010 * Reset the card by performing the same steps that are taken by 1011 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. 1012 * 1013 * sdio_reset() is technically not needed. Having just powered up the 1014 * hardware, it should already be in reset state. However, some 1015 * platforms (such as SD8686 on OLPC) do not instantly cut power, 1016 * meaning that a reset is required when restoring power soon after 1017 * powering off. It is harmless in other cases. 1018 * 1019 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, 1020 * is not necessary for non-removable cards. However, it is required 1021 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and 1022 * harmless in other situations. 1023 * 1024 */ 1025 1026 sdio_reset(host); 1027 mmc_go_idle(host); 1028 mmc_send_if_cond(host, host->card->ocr); 1029 1030 ret = mmc_send_io_op_cond(host, 0, NULL); 1031 if (ret) 1032 goto out; 1033 1034 ret = mmc_sdio_init_card(host, host->card->ocr, host->card, 1035 mmc_card_keep_power(host)); 1036 if (!ret && host->sdio_irqs) 1037 mmc_signal_sdio_irq(host); 1038 1039out: 1040 mmc_release_host(host); 1041 1042 return ret; 1043} 1044 1045static int mmc_sdio_runtime_suspend(struct mmc_host *host) 1046{ 1047 /* No references to the card, cut the power to it. */ 1048 mmc_power_off(host); 1049 return 0; 1050} 1051 1052static int mmc_sdio_runtime_resume(struct mmc_host *host) 1053{ 1054 /* Restore power and re-initialize. */ 1055 mmc_power_up(host, host->card->ocr); 1056 return mmc_sdio_power_restore(host); 1057} 1058 1059static const struct mmc_bus_ops mmc_sdio_ops = { 1060 .remove = mmc_sdio_remove, 1061 .detect = mmc_sdio_detect, 1062 .pre_suspend = mmc_sdio_pre_suspend, 1063 .suspend = mmc_sdio_suspend, 1064 .resume = mmc_sdio_resume, 1065 .runtime_suspend = mmc_sdio_runtime_suspend, 1066 .runtime_resume = mmc_sdio_runtime_resume, 1067 .power_restore = mmc_sdio_power_restore, 1068 .alive = mmc_sdio_alive, 1069}; 1070 1071 1072/* 1073 * Starting point for SDIO card init. 1074 */ 1075int mmc_attach_sdio(struct mmc_host *host) 1076{ 1077 int err, i, funcs; 1078 u32 ocr, rocr; 1079 struct mmc_card *card; 1080 1081 BUG_ON(!host); 1082 WARN_ON(!host->claimed); 1083 1084 err = mmc_send_io_op_cond(host, 0, &ocr); 1085 if (err) 1086 return err; 1087 1088 mmc_attach_bus(host, &mmc_sdio_ops); 1089 if (host->ocr_avail_sdio) 1090 host->ocr_avail = host->ocr_avail_sdio; 1091 1092 1093 rocr = mmc_select_voltage(host, ocr); 1094 1095 /* 1096 * Can we support the voltage(s) of the card(s)? 1097 */ 1098 if (!rocr) { 1099 err = -EINVAL; 1100 goto err; 1101 } 1102 1103 /* 1104 * Detect and init the card. 1105 */ 1106 err = mmc_sdio_init_card(host, rocr, NULL, 0); 1107 if (err) 1108 goto err; 1109 1110 card = host->card; 1111 1112 /* 1113 * Enable runtime PM only if supported by host+card+board 1114 */ 1115 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1116 /* 1117 * Let runtime PM core know our card is active 1118 */ 1119 err = pm_runtime_set_active(&card->dev); 1120 if (err) 1121 goto remove; 1122 1123 /* 1124 * Enable runtime PM for this card 1125 */ 1126 pm_runtime_enable(&card->dev); 1127 } 1128 1129 /* 1130 * The number of functions on the card is encoded inside 1131 * the ocr. 1132 */ 1133 funcs = (ocr & 0x70000000) >> 28; 1134 card->sdio_funcs = 0; 1135 1136 /* 1137 * Initialize (but don't add) all present functions. 1138 */ 1139 for (i = 0; i < funcs; i++, card->sdio_funcs++) { 1140 err = sdio_init_func(host->card, i + 1); 1141 if (err) 1142 goto remove; 1143 1144 /* 1145 * Enable Runtime PM for this func (if supported) 1146 */ 1147 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1148 pm_runtime_enable(&card->sdio_func[i]->dev); 1149 } 1150 1151 /* 1152 * First add the card to the driver model... 1153 */ 1154 mmc_release_host(host); 1155 err = mmc_add_card(host->card); 1156 if (err) 1157 goto remove_added; 1158 1159 /* 1160 * ...then the SDIO functions. 1161 */ 1162 for (i = 0;i < funcs;i++) { 1163 err = sdio_add_func(host->card->sdio_func[i]); 1164 if (err) 1165 goto remove_added; 1166 } 1167 1168 mmc_claim_host(host); 1169 return 0; 1170 1171 1172remove_added: 1173 /* Remove without lock if the device has been added. */ 1174 mmc_sdio_remove(host); 1175 mmc_claim_host(host); 1176remove: 1177 /* And with lock if it hasn't been added. */ 1178 mmc_release_host(host); 1179 if (host->card) 1180 mmc_sdio_remove(host); 1181 mmc_claim_host(host); 1182err: 1183 mmc_detach_bus(host); 1184 1185 pr_err("%s: error %d whilst initialising SDIO card\n", 1186 mmc_hostname(host), err); 1187 1188 return err; 1189} 1190 1191