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 (card->host->caps & 161 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 162 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | 163 MMC_CAP_UHS_DDR50)) { 164 if (data & SDIO_UHS_DDR50) 165 card->sw_caps.sd3_bus_mode 166 |= SD_MODE_UHS_DDR50; 167 168 if (data & SDIO_UHS_SDR50) 169 card->sw_caps.sd3_bus_mode 170 |= SD_MODE_UHS_SDR50; 171 172 if (data & SDIO_UHS_SDR104) 173 card->sw_caps.sd3_bus_mode 174 |= SD_MODE_UHS_SDR104; 175 } 176 177 ret = mmc_io_rw_direct(card, 0, 0, 178 SDIO_CCCR_DRIVE_STRENGTH, 0, &data); 179 if (ret) 180 goto out; 181 182 if (data & SDIO_DRIVE_SDTA) 183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; 184 if (data & SDIO_DRIVE_SDTC) 185 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; 186 if (data & SDIO_DRIVE_SDTD) 187 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; 188 } 189 190 /* if no uhs mode ensure we check for high speed */ 191 if (!card->sw_caps.sd3_bus_mode) { 192 if (speed & SDIO_SPEED_SHS) { 193 card->cccr.high_speed = 1; 194 card->sw_caps.hs_max_dtr = 50000000; 195 } else { 196 card->cccr.high_speed = 0; 197 card->sw_caps.hs_max_dtr = 25000000; 198 } 199 } 200 } 201 202 out: 203 return ret; 204 } 205 206 static int sdio_enable_wide(struct mmc_card *card) 207 { 208 int ret; 209 u8 ctrl; 210 211 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 212 return 0; 213 214 if (card->cccr.low_speed && !card->cccr.wide_bus) 215 return 0; 216 217 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 218 if (ret) 219 return ret; 220 221 ctrl |= SDIO_BUS_WIDTH_4BIT; 222 223 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 224 if (ret) 225 return ret; 226 227 return 1; 228 } 229 230 /* 231 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) 232 * of the card. This may be required on certain setups of boards, 233 * controllers and embedded sdio device which do not need the card's 234 * pull-up. As a result, card detection is disabled and power is saved. 235 */ 236 static int sdio_disable_cd(struct mmc_card *card) 237 { 238 int ret; 239 u8 ctrl; 240 241 if (!mmc_card_disable_cd(card)) 242 return 0; 243 244 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 245 if (ret) 246 return ret; 247 248 ctrl |= SDIO_BUS_CD_DISABLE; 249 250 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 251 } 252 253 /* 254 * Devices that remain active during a system suspend are 255 * put back into 1-bit mode. 256 */ 257 static int sdio_disable_wide(struct mmc_card *card) 258 { 259 int ret; 260 u8 ctrl; 261 262 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 263 return 0; 264 265 if (card->cccr.low_speed && !card->cccr.wide_bus) 266 return 0; 267 268 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 269 if (ret) 270 return ret; 271 272 if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) 273 return 0; 274 275 ctrl &= ~SDIO_BUS_WIDTH_4BIT; 276 ctrl |= SDIO_BUS_ASYNC_INT; 277 278 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 279 if (ret) 280 return ret; 281 282 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); 283 284 return 0; 285 } 286 287 288 static int sdio_enable_4bit_bus(struct mmc_card *card) 289 { 290 int err; 291 292 if (card->type == MMC_TYPE_SDIO) 293 return sdio_enable_wide(card); 294 295 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 296 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 297 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 298 if (err) 299 return err; 300 } else 301 return 0; 302 303 err = sdio_enable_wide(card); 304 if (err <= 0) 305 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); 306 307 return err; 308 } 309 310 311 /* 312 * Test if the card supports high-speed mode and, if so, switch to it. 313 */ 314 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) 315 { 316 int ret; 317 u8 speed; 318 319 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 320 return 0; 321 322 if (!card->cccr.high_speed) 323 return 0; 324 325 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 326 if (ret) 327 return ret; 328 329 if (enable) 330 speed |= SDIO_SPEED_EHS; 331 else 332 speed &= ~SDIO_SPEED_EHS; 333 334 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 335 if (ret) 336 return ret; 337 338 return 1; 339 } 340 341 /* 342 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. 343 */ 344 static int sdio_enable_hs(struct mmc_card *card) 345 { 346 int ret; 347 348 ret = mmc_sdio_switch_hs(card, true); 349 if (ret <= 0 || card->type == MMC_TYPE_SDIO) 350 return ret; 351 352 ret = mmc_sd_switch_hs(card); 353 if (ret <= 0) 354 mmc_sdio_switch_hs(card, false); 355 356 return ret; 357 } 358 359 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) 360 { 361 unsigned max_dtr; 362 363 if (mmc_card_highspeed(card)) { 364 /* 365 * The SDIO specification doesn't mention how 366 * the CIS transfer speed register relates to 367 * high-speed, but it seems that 50 MHz is 368 * mandatory. 369 */ 370 max_dtr = 50000000; 371 } else { 372 max_dtr = card->cis.max_dtr; 373 } 374 375 if (card->type == MMC_TYPE_SD_COMBO) 376 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); 377 378 return max_dtr; 379 } 380 381 static unsigned char host_drive_to_sdio_drive(int host_strength) 382 { 383 switch (host_strength) { 384 case MMC_SET_DRIVER_TYPE_A: 385 return SDIO_DTSx_SET_TYPE_A; 386 case MMC_SET_DRIVER_TYPE_B: 387 return SDIO_DTSx_SET_TYPE_B; 388 case MMC_SET_DRIVER_TYPE_C: 389 return SDIO_DTSx_SET_TYPE_C; 390 case MMC_SET_DRIVER_TYPE_D: 391 return SDIO_DTSx_SET_TYPE_D; 392 default: 393 return SDIO_DTSx_SET_TYPE_B; 394 } 395 } 396 397 static void sdio_select_driver_type(struct mmc_card *card) 398 { 399 int host_drv_type = SD_DRIVER_TYPE_B; 400 int card_drv_type = SD_DRIVER_TYPE_B; 401 int drive_strength; 402 unsigned char card_strength; 403 int err; 404 405 /* 406 * If the host doesn't support any of the Driver Types A,C or D, 407 * or there is no board specific handler then default Driver 408 * Type B is used. 409 */ 410 if (!(card->host->caps & 411 (MMC_CAP_DRIVER_TYPE_A | 412 MMC_CAP_DRIVER_TYPE_C | 413 MMC_CAP_DRIVER_TYPE_D))) 414 return; 415 416 if (!card->host->ops->select_drive_strength) 417 return; 418 419 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 420 host_drv_type |= SD_DRIVER_TYPE_A; 421 422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 423 host_drv_type |= SD_DRIVER_TYPE_C; 424 425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 426 host_drv_type |= SD_DRIVER_TYPE_D; 427 428 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 429 card_drv_type |= SD_DRIVER_TYPE_A; 430 431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 432 card_drv_type |= SD_DRIVER_TYPE_C; 433 434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 435 card_drv_type |= SD_DRIVER_TYPE_D; 436 437 /* 438 * The drive strength that the hardware can support 439 * depends on the board design. Pass the appropriate 440 * information and let the hardware specific code 441 * return what is possible given the options 442 */ 443 drive_strength = card->host->ops->select_drive_strength( 444 card->sw_caps.uhs_max_dtr, 445 host_drv_type, card_drv_type); 446 447 /* if error just use default for drive strength B */ 448 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, 449 &card_strength); 450 if (err) 451 return; 452 453 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); 454 card_strength |= host_drive_to_sdio_drive(drive_strength); 455 456 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, 457 card_strength, NULL); 458 459 /* if error default to drive strength B */ 460 if (!err) 461 mmc_set_driver_type(card->host, drive_strength); 462 } 463 464 465 static int sdio_set_bus_speed_mode(struct mmc_card *card) 466 { 467 unsigned int bus_speed, timing; 468 int err; 469 unsigned char speed; 470 471 /* 472 * If the host doesn't support any of the UHS-I modes, fallback on 473 * default speed. 474 */ 475 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 476 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) 477 return 0; 478 479 bus_speed = SDIO_SPEED_SDR12; 480 timing = MMC_TIMING_UHS_SDR12; 481 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 482 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 483 bus_speed = SDIO_SPEED_SDR104; 484 timing = MMC_TIMING_UHS_SDR104; 485 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 486 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 487 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 488 bus_speed = SDIO_SPEED_DDR50; 489 timing = MMC_TIMING_UHS_DDR50; 490 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 492 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 493 SD_MODE_UHS_SDR50)) { 494 bus_speed = SDIO_SPEED_SDR50; 495 timing = MMC_TIMING_UHS_SDR50; 496 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 499 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 500 bus_speed = SDIO_SPEED_SDR25; 501 timing = MMC_TIMING_UHS_SDR25; 502 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 503 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 504 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 505 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 506 SD_MODE_UHS_SDR12)) { 507 bus_speed = SDIO_SPEED_SDR12; 508 timing = MMC_TIMING_UHS_SDR12; 509 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 510 } 511 512 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 513 if (err) 514 return err; 515 516 speed &= ~SDIO_SPEED_BSS_MASK; 517 speed |= bus_speed; 518 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 519 if (err) 520 return err; 521 522 if (bus_speed) { 523 mmc_set_timing(card->host, timing); 524 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 525 } 526 527 return 0; 528 } 529 530 /* 531 * UHS-I specific initialization procedure 532 */ 533 static int mmc_sdio_init_uhs_card(struct mmc_card *card) 534 { 535 int err; 536 537 if (!card->scr.sda_spec3) 538 return 0; 539 540 /* 541 * Switch to wider bus (if supported). 542 */ 543 if (card->host->caps & MMC_CAP_4_BIT_DATA) { 544 err = sdio_enable_4bit_bus(card); 545 if (err > 0) { 546 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 547 err = 0; 548 } 549 } 550 551 /* Set the driver strength for the card */ 552 sdio_select_driver_type(card); 553 554 /* Set bus speed mode of the card */ 555 err = sdio_set_bus_speed_mode(card); 556 if (err) 557 goto out; 558 559 /* Initialize and start re-tuning timer */ 560 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) 561 err = card->host->ops->execute_tuning(card->host, 562 MMC_SEND_TUNING_BLOCK); 563 564 out: 565 566 return err; 567 } 568 569 /* 570 * Handle the detection and initialisation of a card. 571 * 572 * In the case of a resume, "oldcard" will contain the card 573 * we're trying to reinitialise. 574 */ 575 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 576 struct mmc_card *oldcard, int powered_resume) 577 { 578 struct mmc_card *card; 579 int err; 580 581 BUG_ON(!host); 582 WARN_ON(!host->claimed); 583 584 /* 585 * Inform the card of the voltage 586 */ 587 if (!powered_resume) { 588 /* The initialization should be done at 3.3 V I/O voltage. */ 589 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); 590 591 err = mmc_send_io_op_cond(host, host->ocr, &ocr); 592 if (err) 593 goto err; 594 } 595 596 /* 597 * For SPI, enable CRC as appropriate. 598 */ 599 if (mmc_host_is_spi(host)) { 600 err = mmc_spi_set_crc(host, use_spi_crc); 601 if (err) 602 goto err; 603 } 604 605 /* 606 * Allocate card structure. 607 */ 608 card = mmc_alloc_card(host, NULL); 609 if (IS_ERR(card)) { 610 err = PTR_ERR(card); 611 goto err; 612 } 613 614 if ((ocr & R4_MEMORY_PRESENT) && 615 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) { 616 card->type = MMC_TYPE_SD_COMBO; 617 618 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || 619 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { 620 mmc_remove_card(card); 621 return -ENOENT; 622 } 623 } else { 624 card->type = MMC_TYPE_SDIO; 625 626 if (oldcard && oldcard->type != MMC_TYPE_SDIO) { 627 mmc_remove_card(card); 628 return -ENOENT; 629 } 630 } 631 632 /* 633 * Call the optional HC's init_card function to handle quirks. 634 */ 635 if (host->ops->init_card) 636 host->ops->init_card(host, card); 637 638 /* 639 * If the host and card support UHS-I mode request the card 640 * to switch to 1.8V signaling level. No 1.8v signalling if 641 * UHS mode is not enabled to maintain compatibilty and some 642 * systems that claim 1.8v signalling in fact do not support 643 * it. 644 */ 645 if ((ocr & R4_18V_PRESENT) && 646 (host->caps & 647 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 648 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | 649 MMC_CAP_UHS_DDR50))) { 650 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 651 true); 652 if (err) { 653 ocr &= ~R4_18V_PRESENT; 654 host->ocr &= ~R4_18V_PRESENT; 655 } 656 err = 0; 657 } else { 658 ocr &= ~R4_18V_PRESENT; 659 host->ocr &= ~R4_18V_PRESENT; 660 } 661 662 /* 663 * For native busses: set card RCA and quit open drain mode. 664 */ 665 if (!powered_resume && !mmc_host_is_spi(host)) { 666 err = mmc_send_relative_addr(host, &card->rca); 667 if (err) 668 goto remove; 669 670 /* 671 * Update oldcard with the new RCA received from the SDIO 672 * device -- we're doing this so that it's updated in the 673 * "card" struct when oldcard overwrites that later. 674 */ 675 if (oldcard) 676 oldcard->rca = card->rca; 677 } 678 679 /* 680 * Read CSD, before selecting the card 681 */ 682 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { 683 err = mmc_sd_get_csd(host, card); 684 if (err) 685 return err; 686 687 mmc_decode_cid(card); 688 } 689 690 /* 691 * Select card, as all following commands rely on that. 692 */ 693 if (!powered_resume && !mmc_host_is_spi(host)) { 694 err = mmc_select_card(card); 695 if (err) 696 goto remove; 697 } 698 699 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { 700 /* 701 * This is non-standard SDIO device, meaning it doesn't 702 * have any CIA (Common I/O area) registers present. 703 * It's host's responsibility to fill cccr and cis 704 * structures in init_card(). 705 */ 706 mmc_set_clock(host, card->cis.max_dtr); 707 708 if (card->cccr.high_speed) { 709 mmc_card_set_highspeed(card); 710 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 711 } 712 713 goto finish; 714 } 715 716 /* 717 * Read the common registers. 718 */ 719 err = sdio_read_cccr(card, ocr); 720 if (err) 721 goto remove; 722 723 /* 724 * Read the common CIS tuples. 725 */ 726 err = sdio_read_common_cis(card); 727 if (err) 728 goto remove; 729 730 if (oldcard) { 731 int same = (card->cis.vendor == oldcard->cis.vendor && 732 card->cis.device == oldcard->cis.device); 733 mmc_remove_card(card); 734 if (!same) 735 return -ENOENT; 736 737 card = oldcard; 738 } 739 mmc_fixup_device(card, NULL); 740 741 if (card->type == MMC_TYPE_SD_COMBO) { 742 err = mmc_sd_setup_card(host, card, oldcard != NULL); 743 /* handle as SDIO-only card if memory init failed */ 744 if (err) { 745 mmc_go_idle(host); 746 if (mmc_host_is_spi(host)) 747 /* should not fail, as it worked previously */ 748 mmc_spi_set_crc(host, use_spi_crc); 749 card->type = MMC_TYPE_SDIO; 750 } else 751 card->dev.type = &sd_type; 752 } 753 754 /* 755 * If needed, disconnect card detection pull-up resistor. 756 */ 757 err = sdio_disable_cd(card); 758 if (err) 759 goto remove; 760 761 /* Initialization sequence for UHS-I cards */ 762 /* Only if card supports 1.8v and UHS signaling */ 763 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { 764 err = mmc_sdio_init_uhs_card(card); 765 if (err) 766 goto remove; 767 768 /* Card is an ultra-high-speed card */ 769 mmc_card_set_uhs(card); 770 } else { 771 /* 772 * Switch to high-speed (if supported). 773 */ 774 err = sdio_enable_hs(card); 775 if (err > 0) 776 mmc_sd_go_highspeed(card); 777 else if (err) 778 goto remove; 779 780 /* 781 * Change to the card's maximum speed. 782 */ 783 mmc_set_clock(host, mmc_sdio_get_max_clock(card)); 784 785 /* 786 * Switch to wider bus (if supported). 787 */ 788 err = sdio_enable_4bit_bus(card); 789 if (err > 0) 790 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 791 else if (err) 792 goto remove; 793 } 794 finish: 795 if (!oldcard) 796 host->card = card; 797 return 0; 798 799 remove: 800 if (!oldcard) 801 mmc_remove_card(card); 802 803 err: 804 return err; 805 } 806 807 /* 808 * Host is being removed. Free up the current card. 809 */ 810 static void mmc_sdio_remove(struct mmc_host *host) 811 { 812 int i; 813 814 BUG_ON(!host); 815 BUG_ON(!host->card); 816 817 for (i = 0;i < host->card->sdio_funcs;i++) { 818 if (host->card->sdio_func[i]) { 819 sdio_remove_func(host->card->sdio_func[i]); 820 host->card->sdio_func[i] = NULL; 821 } 822 } 823 824 mmc_remove_card(host->card); 825 host->card = NULL; 826 } 827 828 /* 829 * Card detection - card is alive. 830 */ 831 static int mmc_sdio_alive(struct mmc_host *host) 832 { 833 return mmc_select_card(host->card); 834 } 835 836 /* 837 * Card detection callback from host. 838 */ 839 static void mmc_sdio_detect(struct mmc_host *host) 840 { 841 int err; 842 843 BUG_ON(!host); 844 BUG_ON(!host->card); 845 846 /* Make sure card is powered before detecting it */ 847 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 848 err = pm_runtime_get_sync(&host->card->dev); 849 if (err < 0) 850 goto out; 851 } 852 853 mmc_claim_host(host); 854 855 /* 856 * Just check if our card has been removed. 857 */ 858 err = _mmc_detect_card_removed(host); 859 860 mmc_release_host(host); 861 862 /* 863 * Tell PM core it's OK to power off the card now. 864 * 865 * The _sync variant is used in order to ensure that the card 866 * is left powered off in case an error occurred, and the card 867 * is going to be removed. 868 * 869 * Since there is no specific reason to believe a new user 870 * is about to show up at this point, the _sync variant is 871 * desirable anyway. 872 */ 873 if (host->caps & MMC_CAP_POWER_OFF_CARD) 874 pm_runtime_put_sync(&host->card->dev); 875 876 out: 877 if (err) { 878 mmc_sdio_remove(host); 879 880 mmc_claim_host(host); 881 mmc_detach_bus(host); 882 mmc_power_off(host); 883 mmc_release_host(host); 884 } 885 } 886 887 /* 888 * SDIO suspend. We need to suspend all functions separately. 889 * Therefore all registered functions must have drivers with suspend 890 * and resume methods. Failing that we simply remove the whole card. 891 */ 892 static int mmc_sdio_suspend(struct mmc_host *host) 893 { 894 int i, err = 0; 895 896 for (i = 0; i < host->card->sdio_funcs; i++) { 897 struct sdio_func *func = host->card->sdio_func[i]; 898 if (func && sdio_func_present(func) && func->dev.driver) { 899 const struct dev_pm_ops *pmops = func->dev.driver->pm; 900 if (!pmops || !pmops->suspend || !pmops->resume) { 901 /* force removal of entire card in that case */ 902 err = -ENOSYS; 903 } else 904 err = pmops->suspend(&func->dev); 905 if (err) 906 break; 907 } 908 } 909 while (err && --i >= 0) { 910 struct sdio_func *func = host->card->sdio_func[i]; 911 if (func && sdio_func_present(func) && func->dev.driver) { 912 const struct dev_pm_ops *pmops = func->dev.driver->pm; 913 pmops->resume(&func->dev); 914 } 915 } 916 917 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { 918 mmc_claim_host(host); 919 sdio_disable_wide(host->card); 920 mmc_release_host(host); 921 } 922 923 return err; 924 } 925 926 static int mmc_sdio_resume(struct mmc_host *host) 927 { 928 int i, err = 0; 929 930 BUG_ON(!host); 931 BUG_ON(!host->card); 932 933 /* Basic card reinitialization. */ 934 mmc_claim_host(host); 935 936 /* No need to reinitialize powered-resumed nonremovable cards */ 937 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) 938 err = mmc_sdio_init_card(host, host->ocr, host->card, 939 mmc_card_keep_power(host)); 940 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { 941 /* We may have switched to 1-bit mode during suspend */ 942 err = sdio_enable_4bit_bus(host->card); 943 if (err > 0) { 944 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 945 err = 0; 946 } 947 } 948 949 if (!err && host->sdio_irqs) 950 mmc_signal_sdio_irq(host); 951 mmc_release_host(host); 952 953 /* 954 * If the card looked to be the same as before suspending, then 955 * we proceed to resume all card functions. If one of them returns 956 * an error then we simply return that error to the core and the 957 * card will be redetected as new. It is the responsibility of 958 * the function driver to perform further tests with the extra 959 * knowledge it has of the card to confirm the card is indeed the 960 * same as before suspending (same MAC address for network cards, 961 * etc.) and return an error otherwise. 962 */ 963 for (i = 0; !err && i < host->card->sdio_funcs; i++) { 964 struct sdio_func *func = host->card->sdio_func[i]; 965 if (func && sdio_func_present(func) && func->dev.driver) { 966 const struct dev_pm_ops *pmops = func->dev.driver->pm; 967 err = pmops->resume(&func->dev); 968 } 969 } 970 971 return err; 972 } 973 974 static int mmc_sdio_power_restore(struct mmc_host *host) 975 { 976 int ret; 977 u32 ocr; 978 979 BUG_ON(!host); 980 BUG_ON(!host->card); 981 982 mmc_claim_host(host); 983 984 /* 985 * Reset the card by performing the same steps that are taken by 986 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. 987 * 988 * sdio_reset() is technically not needed. Having just powered up the 989 * hardware, it should already be in reset state. However, some 990 * platforms (such as SD8686 on OLPC) do not instantly cut power, 991 * meaning that a reset is required when restoring power soon after 992 * powering off. It is harmless in other cases. 993 * 994 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, 995 * is not necessary for non-removable cards. However, it is required 996 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and 997 * harmless in other situations. 998 * 999 * With these steps taken, mmc_select_voltage() is also required to 1000 * restore the correct voltage setting of the card. 1001 */ 1002 1003 /* The initialization should be done at 3.3 V I/O voltage. */ 1004 if (!mmc_card_keep_power(host)) 1005 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); 1006 1007 sdio_reset(host); 1008 mmc_go_idle(host); 1009 mmc_send_if_cond(host, host->ocr_avail); 1010 1011 ret = mmc_send_io_op_cond(host, 0, &ocr); 1012 if (ret) 1013 goto out; 1014 1015 if (host->ocr_avail_sdio) 1016 host->ocr_avail = host->ocr_avail_sdio; 1017 1018 host->ocr = mmc_select_voltage(host, ocr & ~0x7F); 1019 if (!host->ocr) { 1020 ret = -EINVAL; 1021 goto out; 1022 } 1023 1024 ret = mmc_sdio_init_card(host, host->ocr, host->card, 1025 mmc_card_keep_power(host)); 1026 if (!ret && host->sdio_irqs) 1027 mmc_signal_sdio_irq(host); 1028 1029 out: 1030 mmc_release_host(host); 1031 1032 return ret; 1033 } 1034 1035 static const struct mmc_bus_ops mmc_sdio_ops = { 1036 .remove = mmc_sdio_remove, 1037 .detect = mmc_sdio_detect, 1038 .suspend = mmc_sdio_suspend, 1039 .resume = mmc_sdio_resume, 1040 .power_restore = mmc_sdio_power_restore, 1041 .alive = mmc_sdio_alive, 1042 }; 1043 1044 1045 /* 1046 * Starting point for SDIO card init. 1047 */ 1048 int mmc_attach_sdio(struct mmc_host *host) 1049 { 1050 int err, i, funcs; 1051 u32 ocr; 1052 struct mmc_card *card; 1053 1054 BUG_ON(!host); 1055 WARN_ON(!host->claimed); 1056 1057 err = mmc_send_io_op_cond(host, 0, &ocr); 1058 if (err) 1059 return err; 1060 1061 mmc_attach_bus(host, &mmc_sdio_ops); 1062 if (host->ocr_avail_sdio) 1063 host->ocr_avail = host->ocr_avail_sdio; 1064 1065 /* 1066 * Sanity check the voltages that the card claims to 1067 * support. 1068 */ 1069 if (ocr & 0x7F) { 1070 pr_warning("%s: card claims to support voltages " 1071 "below the defined range. These will be ignored.\n", 1072 mmc_hostname(host)); 1073 ocr &= ~0x7F; 1074 } 1075 1076 host->ocr = mmc_select_voltage(host, ocr); 1077 1078 /* 1079 * Can we support the voltage(s) of the card(s)? 1080 */ 1081 if (!host->ocr) { 1082 err = -EINVAL; 1083 goto err; 1084 } 1085 1086 /* 1087 * Detect and init the card. 1088 */ 1089 err = mmc_sdio_init_card(host, host->ocr, NULL, 0); 1090 if (err) { 1091 if (err == -EAGAIN) { 1092 /* 1093 * Retry initialization with S18R set to 0. 1094 */ 1095 host->ocr &= ~R4_18V_PRESENT; 1096 err = mmc_sdio_init_card(host, host->ocr, NULL, 0); 1097 } 1098 if (err) 1099 goto err; 1100 } 1101 card = host->card; 1102 1103 /* 1104 * Enable runtime PM only if supported by host+card+board 1105 */ 1106 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1107 /* 1108 * Let runtime PM core know our card is active 1109 */ 1110 err = pm_runtime_set_active(&card->dev); 1111 if (err) 1112 goto remove; 1113 1114 /* 1115 * Enable runtime PM for this card 1116 */ 1117 pm_runtime_enable(&card->dev); 1118 } 1119 1120 /* 1121 * The number of functions on the card is encoded inside 1122 * the ocr. 1123 */ 1124 funcs = (ocr & 0x70000000) >> 28; 1125 card->sdio_funcs = 0; 1126 1127 /* 1128 * Initialize (but don't add) all present functions. 1129 */ 1130 for (i = 0; i < funcs; i++, card->sdio_funcs++) { 1131 err = sdio_init_func(host->card, i + 1); 1132 if (err) 1133 goto remove; 1134 1135 /* 1136 * Enable Runtime PM for this func (if supported) 1137 */ 1138 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1139 pm_runtime_enable(&card->sdio_func[i]->dev); 1140 } 1141 1142 /* 1143 * First add the card to the driver model... 1144 */ 1145 mmc_release_host(host); 1146 err = mmc_add_card(host->card); 1147 if (err) 1148 goto remove_added; 1149 1150 /* 1151 * ...then the SDIO functions. 1152 */ 1153 for (i = 0;i < funcs;i++) { 1154 err = sdio_add_func(host->card->sdio_func[i]); 1155 if (err) 1156 goto remove_added; 1157 } 1158 1159 mmc_claim_host(host); 1160 return 0; 1161 1162 1163 remove_added: 1164 /* Remove without lock if the device has been added. */ 1165 mmc_sdio_remove(host); 1166 mmc_claim_host(host); 1167 remove: 1168 /* And with lock if it hasn't been added. */ 1169 mmc_release_host(host); 1170 if (host->card) 1171 mmc_sdio_remove(host); 1172 mmc_claim_host(host); 1173 err: 1174 mmc_detach_bus(host); 1175 1176 pr_err("%s: error %d whilst initialising SDIO card\n", 1177 mmc_hostname(host), err); 1178 1179 return err; 1180 } 1181 1182