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 31 static 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 57 out: 58 return ret; 59 } 60 61 static 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 92 fail: 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 } 100 101 static 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 } 198 199 out: 200 return ret; 201 } 202 203 static 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 */ 239 static 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 */ 260 static 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 } 289 290 291 static int sdio_enable_4bit_bus(struct mmc_card *card) 292 { 293 int err; 294 295 if (card->type == MMC_TYPE_SDIO) 296 return sdio_enable_wide(card); 297 298 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 299 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 300 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 301 if (err) 302 return err; 303 } else 304 return 0; 305 306 err = sdio_enable_wide(card); 307 if (err <= 0) 308 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); 309 310 return err; 311 } 312 313 314 /* 315 * Test if the card supports high-speed mode and, if so, switch to it. 316 */ 317 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) 318 { 319 int ret; 320 u8 speed; 321 322 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 323 return 0; 324 325 if (!card->cccr.high_speed) 326 return 0; 327 328 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 329 if (ret) 330 return ret; 331 332 if (enable) 333 speed |= SDIO_SPEED_EHS; 334 else 335 speed &= ~SDIO_SPEED_EHS; 336 337 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 338 if (ret) 339 return ret; 340 341 return 1; 342 } 343 344 /* 345 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. 346 */ 347 static int sdio_enable_hs(struct mmc_card *card) 348 { 349 int ret; 350 351 ret = mmc_sdio_switch_hs(card, true); 352 if (ret <= 0 || card->type == MMC_TYPE_SDIO) 353 return ret; 354 355 ret = mmc_sd_switch_hs(card); 356 if (ret <= 0) 357 mmc_sdio_switch_hs(card, false); 358 359 return ret; 360 } 361 362 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) 363 { 364 unsigned max_dtr; 365 366 if (mmc_card_hs(card)) { 367 /* 368 * The SDIO specification doesn't mention how 369 * the CIS transfer speed register relates to 370 * high-speed, but it seems that 50 MHz is 371 * mandatory. 372 */ 373 max_dtr = 50000000; 374 } else { 375 max_dtr = card->cis.max_dtr; 376 } 377 378 if (card->type == MMC_TYPE_SD_COMBO) 379 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); 380 381 return max_dtr; 382 } 383 384 static unsigned char host_drive_to_sdio_drive(int host_strength) 385 { 386 switch (host_strength) { 387 case MMC_SET_DRIVER_TYPE_A: 388 return SDIO_DTSx_SET_TYPE_A; 389 case MMC_SET_DRIVER_TYPE_B: 390 return SDIO_DTSx_SET_TYPE_B; 391 case MMC_SET_DRIVER_TYPE_C: 392 return SDIO_DTSx_SET_TYPE_C; 393 case MMC_SET_DRIVER_TYPE_D: 394 return SDIO_DTSx_SET_TYPE_D; 395 default: 396 return SDIO_DTSx_SET_TYPE_B; 397 } 398 } 399 400 static void sdio_select_driver_type(struct mmc_card *card) 401 { 402 int host_drv_type = SD_DRIVER_TYPE_B; 403 int card_drv_type = SD_DRIVER_TYPE_B; 404 int drive_strength; 405 unsigned char card_strength; 406 int err; 407 408 /* 409 * If the host doesn't support any of the Driver Types A,C or D, 410 * or there is no board specific handler then default Driver 411 * Type B is used. 412 */ 413 if (!(card->host->caps & 414 (MMC_CAP_DRIVER_TYPE_A | 415 MMC_CAP_DRIVER_TYPE_C | 416 MMC_CAP_DRIVER_TYPE_D))) 417 return; 418 419 if (!card->host->ops->select_drive_strength) 420 return; 421 422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 423 host_drv_type |= SD_DRIVER_TYPE_A; 424 425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 426 host_drv_type |= SD_DRIVER_TYPE_C; 427 428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 429 host_drv_type |= SD_DRIVER_TYPE_D; 430 431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 432 card_drv_type |= SD_DRIVER_TYPE_A; 433 434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 435 card_drv_type |= SD_DRIVER_TYPE_C; 436 437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 438 card_drv_type |= SD_DRIVER_TYPE_D; 439 440 /* 441 * The drive strength that the hardware can support 442 * depends on the board design. Pass the appropriate 443 * information and let the hardware specific code 444 * return what is possible given the options 445 */ 446 drive_strength = card->host->ops->select_drive_strength( 447 card->sw_caps.uhs_max_dtr, 448 host_drv_type, card_drv_type); 449 450 /* if error just use default for drive strength B */ 451 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, 452 &card_strength); 453 if (err) 454 return; 455 456 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); 457 card_strength |= host_drive_to_sdio_drive(drive_strength); 458 459 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, 460 card_strength, NULL); 461 462 /* if error default to drive strength B */ 463 if (!err) 464 mmc_set_driver_type(card->host, drive_strength); 465 } 466 467 468 static int sdio_set_bus_speed_mode(struct mmc_card *card) 469 { 470 unsigned int bus_speed, timing; 471 int err; 472 unsigned char speed; 473 474 /* 475 * If the host doesn't support any of the UHS-I modes, fallback on 476 * default speed. 477 */ 478 if (!mmc_host_uhs(card->host)) 479 return 0; 480 481 bus_speed = SDIO_SPEED_SDR12; 482 timing = MMC_TIMING_UHS_SDR12; 483 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 484 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 485 bus_speed = SDIO_SPEED_SDR104; 486 timing = MMC_TIMING_UHS_SDR104; 487 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 488 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 489 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 490 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 491 bus_speed = SDIO_SPEED_DDR50; 492 timing = MMC_TIMING_UHS_DDR50; 493 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 494 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 496 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 497 SD_MODE_UHS_SDR50)) { 498 bus_speed = SDIO_SPEED_SDR50; 499 timing = MMC_TIMING_UHS_SDR50; 500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 501 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 502 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 503 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 504 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 505 bus_speed = SDIO_SPEED_SDR25; 506 timing = MMC_TIMING_UHS_SDR25; 507 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 508 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 509 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 510 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 511 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 512 SD_MODE_UHS_SDR12)) { 513 bus_speed = SDIO_SPEED_SDR12; 514 timing = MMC_TIMING_UHS_SDR12; 515 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 516 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 517 } 518 519 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 520 if (err) 521 return err; 522 523 speed &= ~SDIO_SPEED_BSS_MASK; 524 speed |= bus_speed; 525 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 526 if (err) 527 return err; 528 529 if (bus_speed) { 530 mmc_set_timing(card->host, timing); 531 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 532 } 533 534 return 0; 535 } 536 537 /* 538 * UHS-I specific initialization procedure 539 */ 540 static int mmc_sdio_init_uhs_card(struct mmc_card *card) 541 { 542 int err; 543 544 if (!card->scr.sda_spec3) 545 return 0; 546 547 /* 548 * Switch to wider bus (if supported). 549 */ 550 if (card->host->caps & MMC_CAP_4_BIT_DATA) { 551 err = sdio_enable_4bit_bus(card); 552 if (err > 0) { 553 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 554 err = 0; 555 } 556 } 557 558 /* Set the driver strength for the card */ 559 sdio_select_driver_type(card); 560 561 /* Set bus speed mode of the card */ 562 err = sdio_set_bus_speed_mode(card); 563 if (err) 564 goto out; 565 566 /* 567 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 568 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 569 */ 570 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning && 571 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) || 572 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104))) { 573 mmc_host_clk_hold(card->host); 574 err = card->host->ops->execute_tuning(card->host, 575 MMC_SEND_TUNING_BLOCK); 576 mmc_host_clk_release(card->host); 577 } 578 579 out: 580 581 return err; 582 } 583 584 /* 585 * Handle the detection and initialisation of a card. 586 * 587 * In the case of a resume, "oldcard" will contain the card 588 * we're trying to reinitialise. 589 */ 590 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 591 struct mmc_card *oldcard, int powered_resume) 592 { 593 struct mmc_card *card; 594 int err; 595 int retries = 10; 596 u32 rocr = 0; 597 u32 ocr_card = ocr; 598 599 BUG_ON(!host); 600 WARN_ON(!host->claimed); 601 602 /* to query card if 1.8V signalling is supported */ 603 if (mmc_host_uhs(host)) 604 ocr |= R4_18V_PRESENT; 605 606 try_again: 607 if (!retries) { 608 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 609 ocr &= ~R4_18V_PRESENT; 610 } 611 612 /* 613 * Inform the card of the voltage 614 */ 615 if (!powered_resume) { 616 err = mmc_send_io_op_cond(host, ocr, &rocr); 617 if (err) 618 goto err; 619 } 620 621 /* 622 * For SPI, enable CRC as appropriate. 623 */ 624 if (mmc_host_is_spi(host)) { 625 err = mmc_spi_set_crc(host, use_spi_crc); 626 if (err) 627 goto err; 628 } 629 630 /* 631 * Allocate card structure. 632 */ 633 card = mmc_alloc_card(host, NULL); 634 if (IS_ERR(card)) { 635 err = PTR_ERR(card); 636 goto err; 637 } 638 639 if ((rocr & R4_MEMORY_PRESENT) && 640 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { 641 card->type = MMC_TYPE_SD_COMBO; 642 643 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || 644 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { 645 mmc_remove_card(card); 646 return -ENOENT; 647 } 648 } else { 649 card->type = MMC_TYPE_SDIO; 650 651 if (oldcard && oldcard->type != MMC_TYPE_SDIO) { 652 mmc_remove_card(card); 653 return -ENOENT; 654 } 655 } 656 657 /* 658 * Call the optional HC's init_card function to handle quirks. 659 */ 660 if (host->ops->init_card) 661 host->ops->init_card(host, card); 662 663 /* 664 * If the host and card support UHS-I mode request the card 665 * to switch to 1.8V signaling level. No 1.8v signalling if 666 * UHS mode is not enabled to maintain compatibility and some 667 * systems that claim 1.8v signalling in fact do not support 668 * it. 669 */ 670 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) { 671 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 672 ocr); 673 if (err == -EAGAIN) { 674 sdio_reset(host); 675 mmc_go_idle(host); 676 mmc_send_if_cond(host, host->ocr_avail); 677 mmc_remove_card(card); 678 retries--; 679 goto try_again; 680 } else if (err) { 681 ocr &= ~R4_18V_PRESENT; 682 } 683 err = 0; 684 } else { 685 ocr &= ~R4_18V_PRESENT; 686 } 687 688 /* 689 * For native busses: set card RCA and quit open drain mode. 690 */ 691 if (!powered_resume && !mmc_host_is_spi(host)) { 692 err = mmc_send_relative_addr(host, &card->rca); 693 if (err) 694 goto remove; 695 696 /* 697 * Update oldcard with the new RCA received from the SDIO 698 * device -- we're doing this so that it's updated in the 699 * "card" struct when oldcard overwrites that later. 700 */ 701 if (oldcard) 702 oldcard->rca = card->rca; 703 } 704 705 /* 706 * Read CSD, before selecting the card 707 */ 708 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { 709 err = mmc_sd_get_csd(host, card); 710 if (err) 711 return err; 712 713 mmc_decode_cid(card); 714 } 715 716 /* 717 * Select card, as all following commands rely on that. 718 */ 719 if (!powered_resume && !mmc_host_is_spi(host)) { 720 err = mmc_select_card(card); 721 if (err) 722 goto remove; 723 } 724 725 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { 726 /* 727 * This is non-standard SDIO device, meaning it doesn't 728 * have any CIA (Common I/O area) registers present. 729 * It's host's responsibility to fill cccr and cis 730 * structures in init_card(). 731 */ 732 mmc_set_clock(host, card->cis.max_dtr); 733 734 if (card->cccr.high_speed) { 735 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 736 } 737 738 goto finish; 739 } 740 741 /* 742 * Read the common registers. 743 */ 744 err = sdio_read_cccr(card, ocr); 745 if (err) 746 goto remove; 747 748 /* 749 * Read the common CIS tuples. 750 */ 751 err = sdio_read_common_cis(card); 752 if (err) 753 goto remove; 754 755 if (oldcard) { 756 int same = (card->cis.vendor == oldcard->cis.vendor && 757 card->cis.device == oldcard->cis.device); 758 mmc_remove_card(card); 759 if (!same) 760 return -ENOENT; 761 762 card = oldcard; 763 } 764 card->ocr = ocr_card; 765 mmc_fixup_device(card, NULL); 766 767 if (card->type == MMC_TYPE_SD_COMBO) { 768 err = mmc_sd_setup_card(host, card, oldcard != NULL); 769 /* handle as SDIO-only card if memory init failed */ 770 if (err) { 771 mmc_go_idle(host); 772 if (mmc_host_is_spi(host)) 773 /* should not fail, as it worked previously */ 774 mmc_spi_set_crc(host, use_spi_crc); 775 card->type = MMC_TYPE_SDIO; 776 } else 777 card->dev.type = &sd_type; 778 } 779 780 /* 781 * If needed, disconnect card detection pull-up resistor. 782 */ 783 err = sdio_disable_cd(card); 784 if (err) 785 goto remove; 786 787 /* Initialization sequence for UHS-I cards */ 788 /* Only if card supports 1.8v and UHS signaling */ 789 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { 790 err = mmc_sdio_init_uhs_card(card); 791 if (err) 792 goto remove; 793 } else { 794 /* 795 * Switch to high-speed (if supported). 796 */ 797 err = sdio_enable_hs(card); 798 if (err > 0) 799 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 800 else if (err) 801 goto remove; 802 803 /* 804 * Change to the card's maximum speed. 805 */ 806 mmc_set_clock(host, mmc_sdio_get_max_clock(card)); 807 808 /* 809 * Switch to wider bus (if supported). 810 */ 811 err = sdio_enable_4bit_bus(card); 812 if (err > 0) 813 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 814 else if (err) 815 goto remove; 816 } 817 finish: 818 if (!oldcard) 819 host->card = card; 820 return 0; 821 822 remove: 823 if (!oldcard) 824 mmc_remove_card(card); 825 826 err: 827 return err; 828 } 829 830 /* 831 * Host is being removed. Free up the current card. 832 */ 833 static void mmc_sdio_remove(struct mmc_host *host) 834 { 835 int i; 836 837 BUG_ON(!host); 838 BUG_ON(!host->card); 839 840 for (i = 0;i < host->card->sdio_funcs;i++) { 841 if (host->card->sdio_func[i]) { 842 sdio_remove_func(host->card->sdio_func[i]); 843 host->card->sdio_func[i] = NULL; 844 } 845 } 846 847 mmc_remove_card(host->card); 848 host->card = NULL; 849 } 850 851 /* 852 * Card detection - card is alive. 853 */ 854 static int mmc_sdio_alive(struct mmc_host *host) 855 { 856 return mmc_select_card(host->card); 857 } 858 859 /* 860 * Card detection callback from host. 861 */ 862 static void mmc_sdio_detect(struct mmc_host *host) 863 { 864 int err; 865 866 BUG_ON(!host); 867 BUG_ON(!host->card); 868 869 /* Make sure card is powered before detecting it */ 870 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 871 err = pm_runtime_get_sync(&host->card->dev); 872 if (err < 0) { 873 pm_runtime_put_noidle(&host->card->dev); 874 goto out; 875 } 876 } 877 878 mmc_claim_host(host); 879 880 /* 881 * Just check if our card has been removed. 882 */ 883 err = _mmc_detect_card_removed(host); 884 885 mmc_release_host(host); 886 887 /* 888 * Tell PM core it's OK to power off the card now. 889 * 890 * The _sync variant is used in order to ensure that the card 891 * is left powered off in case an error occurred, and the card 892 * is going to be removed. 893 * 894 * Since there is no specific reason to believe a new user 895 * is about to show up at this point, the _sync variant is 896 * desirable anyway. 897 */ 898 if (host->caps & MMC_CAP_POWER_OFF_CARD) 899 pm_runtime_put_sync(&host->card->dev); 900 901 out: 902 if (err) { 903 mmc_sdio_remove(host); 904 905 mmc_claim_host(host); 906 mmc_detach_bus(host); 907 mmc_power_off(host); 908 mmc_release_host(host); 909 } 910 } 911 912 /* 913 * SDIO pre_suspend. We need to suspend all functions separately. 914 * Therefore all registered functions must have drivers with suspend 915 * and resume methods. Failing that we simply remove the whole card. 916 */ 917 static int mmc_sdio_pre_suspend(struct mmc_host *host) 918 { 919 int i, err = 0; 920 921 for (i = 0; i < host->card->sdio_funcs; i++) { 922 struct sdio_func *func = host->card->sdio_func[i]; 923 if (func && sdio_func_present(func) && func->dev.driver) { 924 const struct dev_pm_ops *pmops = func->dev.driver->pm; 925 if (!pmops || !pmops->suspend || !pmops->resume) { 926 /* force removal of entire card in that case */ 927 err = -ENOSYS; 928 break; 929 } 930 } 931 } 932 933 return err; 934 } 935 936 /* 937 * SDIO suspend. Suspend all functions separately. 938 */ 939 static int mmc_sdio_suspend(struct mmc_host *host) 940 { 941 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { 942 mmc_claim_host(host); 943 sdio_disable_wide(host->card); 944 mmc_release_host(host); 945 } 946 947 if (!mmc_card_keep_power(host)) 948 mmc_power_off(host); 949 950 return 0; 951 } 952 953 static int mmc_sdio_resume(struct mmc_host *host) 954 { 955 int err = 0; 956 957 BUG_ON(!host); 958 BUG_ON(!host->card); 959 960 /* Basic card reinitialization. */ 961 mmc_claim_host(host); 962 963 /* Restore power if needed */ 964 if (!mmc_card_keep_power(host)) { 965 mmc_power_up(host, host->card->ocr); 966 /* 967 * Tell runtime PM core we just powered up the card, 968 * since it still believes the card is powered off. 969 * Note that currently runtime PM is only enabled 970 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD 971 */ 972 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 973 pm_runtime_disable(&host->card->dev); 974 pm_runtime_set_active(&host->card->dev); 975 pm_runtime_enable(&host->card->dev); 976 } 977 } 978 979 /* No need to reinitialize powered-resumed nonremovable cards */ 980 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) { 981 sdio_reset(host); 982 mmc_go_idle(host); 983 mmc_send_if_cond(host, host->card->ocr); 984 err = mmc_send_io_op_cond(host, 0, NULL); 985 if (!err) 986 err = mmc_sdio_init_card(host, host->card->ocr, 987 host->card, 988 mmc_card_keep_power(host)); 989 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { 990 /* We may have switched to 1-bit mode during suspend */ 991 err = sdio_enable_4bit_bus(host->card); 992 if (err > 0) { 993 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 994 err = 0; 995 } 996 } 997 998 if (!err && host->sdio_irqs) { 999 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) { 1000 wake_up_process(host->sdio_irq_thread); 1001 } else if (host->caps & MMC_CAP_SDIO_IRQ) { 1002 mmc_host_clk_hold(host); 1003 host->ops->enable_sdio_irq(host, 1); 1004 mmc_host_clk_release(host); 1005 } 1006 } 1007 1008 mmc_release_host(host); 1009 1010 host->pm_flags &= ~MMC_PM_KEEP_POWER; 1011 return err; 1012 } 1013 1014 static int mmc_sdio_power_restore(struct mmc_host *host) 1015 { 1016 int ret; 1017 1018 BUG_ON(!host); 1019 BUG_ON(!host->card); 1020 1021 mmc_claim_host(host); 1022 1023 /* 1024 * Reset the card by performing the same steps that are taken by 1025 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. 1026 * 1027 * sdio_reset() is technically not needed. Having just powered up the 1028 * hardware, it should already be in reset state. However, some 1029 * platforms (such as SD8686 on OLPC) do not instantly cut power, 1030 * meaning that a reset is required when restoring power soon after 1031 * powering off. It is harmless in other cases. 1032 * 1033 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, 1034 * is not necessary for non-removable cards. However, it is required 1035 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and 1036 * harmless in other situations. 1037 * 1038 */ 1039 1040 sdio_reset(host); 1041 mmc_go_idle(host); 1042 mmc_send_if_cond(host, host->card->ocr); 1043 1044 ret = mmc_send_io_op_cond(host, 0, NULL); 1045 if (ret) 1046 goto out; 1047 1048 ret = mmc_sdio_init_card(host, host->card->ocr, host->card, 1049 mmc_card_keep_power(host)); 1050 if (!ret && host->sdio_irqs) 1051 mmc_signal_sdio_irq(host); 1052 1053 out: 1054 mmc_release_host(host); 1055 1056 return ret; 1057 } 1058 1059 static int mmc_sdio_runtime_suspend(struct mmc_host *host) 1060 { 1061 /* No references to the card, cut the power to it. */ 1062 mmc_power_off(host); 1063 return 0; 1064 } 1065 1066 static int mmc_sdio_runtime_resume(struct mmc_host *host) 1067 { 1068 /* Restore power and re-initialize. */ 1069 mmc_power_up(host, host->card->ocr); 1070 return mmc_sdio_power_restore(host); 1071 } 1072 1073 static const struct mmc_bus_ops mmc_sdio_ops = { 1074 .remove = mmc_sdio_remove, 1075 .detect = mmc_sdio_detect, 1076 .pre_suspend = mmc_sdio_pre_suspend, 1077 .suspend = mmc_sdio_suspend, 1078 .resume = mmc_sdio_resume, 1079 .runtime_suspend = mmc_sdio_runtime_suspend, 1080 .runtime_resume = mmc_sdio_runtime_resume, 1081 .power_restore = mmc_sdio_power_restore, 1082 .alive = mmc_sdio_alive, 1083 }; 1084 1085 1086 /* 1087 * Starting point for SDIO card init. 1088 */ 1089 int mmc_attach_sdio(struct mmc_host *host) 1090 { 1091 int err, i, funcs; 1092 u32 ocr, rocr; 1093 struct mmc_card *card; 1094 1095 BUG_ON(!host); 1096 WARN_ON(!host->claimed); 1097 1098 err = mmc_send_io_op_cond(host, 0, &ocr); 1099 if (err) 1100 return err; 1101 1102 mmc_attach_bus(host, &mmc_sdio_ops); 1103 if (host->ocr_avail_sdio) 1104 host->ocr_avail = host->ocr_avail_sdio; 1105 1106 1107 rocr = mmc_select_voltage(host, ocr); 1108 1109 /* 1110 * Can we support the voltage(s) of the card(s)? 1111 */ 1112 if (!rocr) { 1113 err = -EINVAL; 1114 goto err; 1115 } 1116 1117 /* 1118 * Detect and init the card. 1119 */ 1120 err = mmc_sdio_init_card(host, rocr, NULL, 0); 1121 if (err) 1122 goto err; 1123 1124 card = host->card; 1125 1126 /* 1127 * Enable runtime PM only if supported by host+card+board 1128 */ 1129 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1130 /* 1131 * Let runtime PM core know our card is active 1132 */ 1133 err = pm_runtime_set_active(&card->dev); 1134 if (err) 1135 goto remove; 1136 1137 /* 1138 * Enable runtime PM for this card 1139 */ 1140 pm_runtime_enable(&card->dev); 1141 } 1142 1143 /* 1144 * The number of functions on the card is encoded inside 1145 * the ocr. 1146 */ 1147 funcs = (ocr & 0x70000000) >> 28; 1148 card->sdio_funcs = 0; 1149 1150 /* 1151 * Initialize (but don't add) all present functions. 1152 */ 1153 for (i = 0; i < funcs; i++, card->sdio_funcs++) { 1154 err = sdio_init_func(host->card, i + 1); 1155 if (err) 1156 goto remove; 1157 1158 /* 1159 * Enable Runtime PM for this func (if supported) 1160 */ 1161 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1162 pm_runtime_enable(&card->sdio_func[i]->dev); 1163 } 1164 1165 /* 1166 * First add the card to the driver model... 1167 */ 1168 mmc_release_host(host); 1169 err = mmc_add_card(host->card); 1170 if (err) 1171 goto remove_added; 1172 1173 /* 1174 * ...then the SDIO functions. 1175 */ 1176 for (i = 0;i < funcs;i++) { 1177 err = sdio_add_func(host->card->sdio_func[i]); 1178 if (err) 1179 goto remove_added; 1180 } 1181 1182 mmc_claim_host(host); 1183 return 0; 1184 1185 1186 remove_added: 1187 /* Remove without lock if the device has been added. */ 1188 mmc_sdio_remove(host); 1189 mmc_claim_host(host); 1190 remove: 1191 /* And with lock if it hasn't been added. */ 1192 mmc_release_host(host); 1193 if (host->card) 1194 mmc_sdio_remove(host); 1195 mmc_claim_host(host); 1196 err: 1197 mmc_detach_bus(host); 1198 1199 pr_err("%s: error %d whilst initialising SDIO card\n", 1200 mmc_hostname(host), err); 1201 1202 return err; 1203 } 1204 1205