1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/mmc/sdio.c 4 * 5 * Copyright 2006-2007 Pierre Ossman 6 */ 7 8 #include <linux/err.h> 9 #include <linux/pm_runtime.h> 10 11 #include <linux/mmc/host.h> 12 #include <linux/mmc/card.h> 13 #include <linux/mmc/mmc.h> 14 #include <linux/mmc/sdio.h> 15 #include <linux/mmc/sdio_func.h> 16 #include <linux/mmc/sdio_ids.h> 17 18 #include "core.h" 19 #include "card.h" 20 #include "host.h" 21 #include "bus.h" 22 #include "quirks.h" 23 #include "sd.h" 24 #include "sdio_bus.h" 25 #include "mmc_ops.h" 26 #include "sd_ops.h" 27 #include "sdio_ops.h" 28 #include "sdio_cis.h" 29 30 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); 31 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); 32 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); 33 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 34 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 35 36 #define sdio_info_attr(num) \ 37 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 38 { \ 39 struct mmc_card *card = mmc_dev_to_card(dev); \ 40 \ 41 if (num > card->num_info) \ 42 return -ENODATA; \ 43 if (!card->info[num-1][0]) \ 44 return 0; \ 45 return sprintf(buf, "%s\n", card->info[num-1]); \ 46 } \ 47 static DEVICE_ATTR_RO(info##num) 48 49 sdio_info_attr(1); 50 sdio_info_attr(2); 51 sdio_info_attr(3); 52 sdio_info_attr(4); 53 54 static struct attribute *sdio_std_attrs[] = { 55 &dev_attr_vendor.attr, 56 &dev_attr_device.attr, 57 &dev_attr_revision.attr, 58 &dev_attr_info1.attr, 59 &dev_attr_info2.attr, 60 &dev_attr_info3.attr, 61 &dev_attr_info4.attr, 62 &dev_attr_ocr.attr, 63 &dev_attr_rca.attr, 64 NULL, 65 }; 66 ATTRIBUTE_GROUPS(sdio_std); 67 68 static struct device_type sdio_type = { 69 .groups = sdio_std_groups, 70 }; 71 72 static int sdio_read_fbr(struct sdio_func *func) 73 { 74 int ret; 75 unsigned char data; 76 77 if (mmc_card_nonstd_func_interface(func->card)) { 78 func->class = SDIO_CLASS_NONE; 79 return 0; 80 } 81 82 ret = mmc_io_rw_direct(func->card, 0, 0, 83 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); 84 if (ret) 85 goto out; 86 87 data &= 0x0f; 88 89 if (data == 0x0f) { 90 ret = mmc_io_rw_direct(func->card, 0, 0, 91 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); 92 if (ret) 93 goto out; 94 } 95 96 func->class = data; 97 98 out: 99 return ret; 100 } 101 102 static int sdio_init_func(struct mmc_card *card, unsigned int fn) 103 { 104 int ret; 105 struct sdio_func *func; 106 107 if (WARN_ON(fn > SDIO_MAX_FUNCS)) 108 return -EINVAL; 109 110 func = sdio_alloc_func(card); 111 if (IS_ERR(func)) 112 return PTR_ERR(func); 113 114 func->num = fn; 115 116 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) { 117 ret = sdio_read_fbr(func); 118 if (ret) 119 goto fail; 120 121 ret = sdio_read_func_cis(func); 122 if (ret) 123 goto fail; 124 } else { 125 func->vendor = func->card->cis.vendor; 126 func->device = func->card->cis.device; 127 func->max_blksize = func->card->cis.blksize; 128 } 129 130 card->sdio_func[fn - 1] = func; 131 132 return 0; 133 134 fail: 135 /* 136 * It is okay to remove the function here even though we hold 137 * the host lock as we haven't registered the device yet. 138 */ 139 sdio_remove_func(func); 140 return ret; 141 } 142 143 static int sdio_read_cccr(struct mmc_card *card, u32 ocr) 144 { 145 int ret; 146 int cccr_vsn; 147 int uhs = ocr & R4_18V_PRESENT; 148 unsigned char data; 149 unsigned char speed; 150 151 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); 152 if (ret) 153 goto out; 154 155 cccr_vsn = data & 0x0f; 156 157 if (cccr_vsn > SDIO_CCCR_REV_3_00) { 158 pr_err("%s: unrecognised CCCR structure version %d\n", 159 mmc_hostname(card->host), cccr_vsn); 160 return -EINVAL; 161 } 162 163 card->cccr.sdio_vsn = (data & 0xf0) >> 4; 164 165 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); 166 if (ret) 167 goto out; 168 169 if (data & SDIO_CCCR_CAP_SMB) 170 card->cccr.multi_block = 1; 171 if (data & SDIO_CCCR_CAP_LSC) 172 card->cccr.low_speed = 1; 173 if (data & SDIO_CCCR_CAP_4BLS) 174 card->cccr.wide_bus = 1; 175 176 if (cccr_vsn >= SDIO_CCCR_REV_1_10) { 177 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); 178 if (ret) 179 goto out; 180 181 if (data & SDIO_POWER_SMPC) 182 card->cccr.high_power = 1; 183 } 184 185 if (cccr_vsn >= SDIO_CCCR_REV_1_20) { 186 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 187 if (ret) 188 goto out; 189 190 card->scr.sda_spec3 = 0; 191 card->sw_caps.sd3_bus_mode = 0; 192 card->sw_caps.sd3_drv_type = 0; 193 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) { 194 card->scr.sda_spec3 = 1; 195 ret = mmc_io_rw_direct(card, 0, 0, 196 SDIO_CCCR_UHS, 0, &data); 197 if (ret) 198 goto out; 199 200 if (mmc_host_uhs(card->host)) { 201 if (data & SDIO_UHS_DDR50) 202 card->sw_caps.sd3_bus_mode 203 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50 204 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12; 205 206 if (data & SDIO_UHS_SDR50) 207 card->sw_caps.sd3_bus_mode 208 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25 209 | SD_MODE_UHS_SDR12; 210 211 if (data & SDIO_UHS_SDR104) 212 card->sw_caps.sd3_bus_mode 213 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50 214 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12; 215 } 216 217 ret = mmc_io_rw_direct(card, 0, 0, 218 SDIO_CCCR_DRIVE_STRENGTH, 0, &data); 219 if (ret) 220 goto out; 221 222 if (data & SDIO_DRIVE_SDTA) 223 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; 224 if (data & SDIO_DRIVE_SDTC) 225 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; 226 if (data & SDIO_DRIVE_SDTD) 227 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; 228 } 229 230 /* if no uhs mode ensure we check for high speed */ 231 if (!card->sw_caps.sd3_bus_mode) { 232 if (speed & SDIO_SPEED_SHS) { 233 card->cccr.high_speed = 1; 234 card->sw_caps.hs_max_dtr = 50000000; 235 } else { 236 card->cccr.high_speed = 0; 237 card->sw_caps.hs_max_dtr = 25000000; 238 } 239 } 240 } 241 242 out: 243 return ret; 244 } 245 246 static int sdio_enable_wide(struct mmc_card *card) 247 { 248 int ret; 249 u8 ctrl; 250 251 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 252 return 0; 253 254 if (card->cccr.low_speed && !card->cccr.wide_bus) 255 return 0; 256 257 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 258 if (ret) 259 return ret; 260 261 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) 262 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", 263 mmc_hostname(card->host), ctrl); 264 265 /* set as 4-bit bus width */ 266 ctrl &= ~SDIO_BUS_WIDTH_MASK; 267 ctrl |= SDIO_BUS_WIDTH_4BIT; 268 269 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 270 if (ret) 271 return ret; 272 273 return 1; 274 } 275 276 /* 277 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) 278 * of the card. This may be required on certain setups of boards, 279 * controllers and embedded sdio device which do not need the card's 280 * pull-up. As a result, card detection is disabled and power is saved. 281 */ 282 static int sdio_disable_cd(struct mmc_card *card) 283 { 284 int ret; 285 u8 ctrl; 286 287 if (!mmc_card_disable_cd(card)) 288 return 0; 289 290 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 291 if (ret) 292 return ret; 293 294 ctrl |= SDIO_BUS_CD_DISABLE; 295 296 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 297 } 298 299 /* 300 * Devices that remain active during a system suspend are 301 * put back into 1-bit mode. 302 */ 303 static int sdio_disable_wide(struct mmc_card *card) 304 { 305 int ret; 306 u8 ctrl; 307 308 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 309 return 0; 310 311 if (card->cccr.low_speed && !card->cccr.wide_bus) 312 return 0; 313 314 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 315 if (ret) 316 return ret; 317 318 if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) 319 return 0; 320 321 ctrl &= ~SDIO_BUS_WIDTH_4BIT; 322 ctrl |= SDIO_BUS_ASYNC_INT; 323 324 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 325 if (ret) 326 return ret; 327 328 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); 329 330 return 0; 331 } 332 333 static int sdio_disable_4bit_bus(struct mmc_card *card) 334 { 335 int err; 336 337 if (card->type == MMC_TYPE_SDIO) 338 goto out; 339 340 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 341 return 0; 342 343 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) 344 return 0; 345 346 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); 347 if (err) 348 return err; 349 350 out: 351 return sdio_disable_wide(card); 352 } 353 354 355 static int sdio_enable_4bit_bus(struct mmc_card *card) 356 { 357 int err; 358 359 err = sdio_enable_wide(card); 360 if (err <= 0) 361 return err; 362 if (card->type == MMC_TYPE_SDIO) 363 goto out; 364 365 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) { 366 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 367 if (err) { 368 sdio_disable_wide(card); 369 return err; 370 } 371 } 372 out: 373 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 374 375 return 0; 376 } 377 378 379 /* 380 * Test if the card supports high-speed mode and, if so, switch to it. 381 */ 382 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) 383 { 384 int ret; 385 u8 speed; 386 387 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 388 return 0; 389 390 if (!card->cccr.high_speed) 391 return 0; 392 393 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 394 if (ret) 395 return ret; 396 397 if (enable) 398 speed |= SDIO_SPEED_EHS; 399 else 400 speed &= ~SDIO_SPEED_EHS; 401 402 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 403 if (ret) 404 return ret; 405 406 return 1; 407 } 408 409 /* 410 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. 411 */ 412 static int sdio_enable_hs(struct mmc_card *card) 413 { 414 int ret; 415 416 ret = mmc_sdio_switch_hs(card, true); 417 if (ret <= 0 || card->type == MMC_TYPE_SDIO) 418 return ret; 419 420 ret = mmc_sd_switch_hs(card); 421 if (ret <= 0) 422 mmc_sdio_switch_hs(card, false); 423 424 return ret; 425 } 426 427 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) 428 { 429 unsigned max_dtr; 430 431 if (mmc_card_hs(card)) { 432 /* 433 * The SDIO specification doesn't mention how 434 * the CIS transfer speed register relates to 435 * high-speed, but it seems that 50 MHz is 436 * mandatory. 437 */ 438 max_dtr = 50000000; 439 } else { 440 max_dtr = card->cis.max_dtr; 441 } 442 443 if (card->type == MMC_TYPE_SD_COMBO) 444 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); 445 446 return max_dtr; 447 } 448 449 static unsigned char host_drive_to_sdio_drive(int host_strength) 450 { 451 switch (host_strength) { 452 case MMC_SET_DRIVER_TYPE_A: 453 return SDIO_DTSx_SET_TYPE_A; 454 case MMC_SET_DRIVER_TYPE_B: 455 return SDIO_DTSx_SET_TYPE_B; 456 case MMC_SET_DRIVER_TYPE_C: 457 return SDIO_DTSx_SET_TYPE_C; 458 case MMC_SET_DRIVER_TYPE_D: 459 return SDIO_DTSx_SET_TYPE_D; 460 default: 461 return SDIO_DTSx_SET_TYPE_B; 462 } 463 } 464 465 static void sdio_select_driver_type(struct mmc_card *card) 466 { 467 int card_drv_type, drive_strength, drv_type; 468 unsigned char card_strength; 469 int err; 470 471 card->drive_strength = 0; 472 473 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 474 475 drive_strength = mmc_select_drive_strength(card, 476 card->sw_caps.uhs_max_dtr, 477 card_drv_type, &drv_type); 478 479 if (drive_strength) { 480 /* if error just use default for drive strength B */ 481 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, 482 &card_strength); 483 if (err) 484 return; 485 486 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); 487 card_strength |= host_drive_to_sdio_drive(drive_strength); 488 489 /* if error default to drive strength B */ 490 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, 491 card_strength, NULL); 492 if (err) 493 return; 494 card->drive_strength = drive_strength; 495 } 496 497 if (drv_type) 498 mmc_set_driver_type(card->host, drv_type); 499 } 500 501 502 static int sdio_set_bus_speed_mode(struct mmc_card *card) 503 { 504 unsigned int bus_speed, timing; 505 int err; 506 unsigned char speed; 507 unsigned int max_rate; 508 509 /* 510 * If the host doesn't support any of the UHS-I modes, fallback on 511 * default speed. 512 */ 513 if (!mmc_host_uhs(card->host)) 514 return 0; 515 516 bus_speed = SDIO_SPEED_SDR12; 517 timing = MMC_TIMING_UHS_SDR12; 518 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 519 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 520 bus_speed = SDIO_SPEED_SDR104; 521 timing = MMC_TIMING_UHS_SDR104; 522 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 523 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 524 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 525 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 526 bus_speed = SDIO_SPEED_DDR50; 527 timing = MMC_TIMING_UHS_DDR50; 528 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 529 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 530 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 531 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 532 SD_MODE_UHS_SDR50)) { 533 bus_speed = SDIO_SPEED_SDR50; 534 timing = MMC_TIMING_UHS_SDR50; 535 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 536 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 537 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 538 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 539 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 540 bus_speed = SDIO_SPEED_SDR25; 541 timing = MMC_TIMING_UHS_SDR25; 542 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 543 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 544 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 545 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 546 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 547 SD_MODE_UHS_SDR12)) { 548 bus_speed = SDIO_SPEED_SDR12; 549 timing = MMC_TIMING_UHS_SDR12; 550 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 551 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 552 } 553 554 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 555 if (err) 556 return err; 557 558 speed &= ~SDIO_SPEED_BSS_MASK; 559 speed |= bus_speed; 560 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 561 if (err) 562 return err; 563 564 max_rate = min_not_zero(card->quirk_max_rate, 565 card->sw_caps.uhs_max_dtr); 566 567 mmc_set_timing(card->host, timing); 568 mmc_set_clock(card->host, max_rate); 569 570 return 0; 571 } 572 573 /* 574 * UHS-I specific initialization procedure 575 */ 576 static int mmc_sdio_init_uhs_card(struct mmc_card *card) 577 { 578 int err; 579 580 if (!card->scr.sda_spec3) 581 return 0; 582 583 /* Switch to wider bus */ 584 err = sdio_enable_4bit_bus(card); 585 if (err) 586 goto out; 587 588 /* Set the driver strength for the card */ 589 sdio_select_driver_type(card); 590 591 /* Set bus speed mode of the card */ 592 err = sdio_set_bus_speed_mode(card); 593 if (err) 594 goto out; 595 596 /* 597 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 598 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 599 */ 600 if (!mmc_host_is_spi(card->host) && 601 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) || 602 (card->host->ios.timing == MMC_TIMING_UHS_SDR104))) 603 err = mmc_execute_tuning(card); 604 out: 605 return err; 606 } 607 608 static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr, 609 struct mmc_card *card) 610 { 611 if (card) 612 mmc_remove_card(card); 613 614 /* 615 * Reset the card by performing the same steps that are taken by 616 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. 617 * 618 * sdio_reset() is technically not needed. Having just powered up the 619 * hardware, it should already be in reset state. However, some 620 * platforms (such as SD8686 on OLPC) do not instantly cut power, 621 * meaning that a reset is required when restoring power soon after 622 * powering off. It is harmless in other cases. 623 * 624 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, 625 * is not necessary for non-removable cards. However, it is required 626 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and 627 * harmless in other situations. 628 * 629 */ 630 631 sdio_reset(host); 632 mmc_go_idle(host); 633 mmc_send_if_cond(host, ocr); 634 return mmc_send_io_op_cond(host, 0, NULL); 635 } 636 637 /* 638 * Handle the detection and initialisation of a card. 639 * 640 * In the case of a resume, "oldcard" will contain the card 641 * we're trying to reinitialise. 642 */ 643 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 644 struct mmc_card *oldcard) 645 { 646 struct mmc_card *card; 647 int err; 648 int retries = 10; 649 u32 rocr = 0; 650 u32 ocr_card = ocr; 651 652 WARN_ON(!host->claimed); 653 654 /* to query card if 1.8V signalling is supported */ 655 if (mmc_host_uhs(host)) 656 ocr |= R4_18V_PRESENT; 657 658 try_again: 659 if (!retries) { 660 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 661 ocr &= ~R4_18V_PRESENT; 662 } 663 664 /* 665 * Inform the card of the voltage 666 */ 667 err = mmc_send_io_op_cond(host, ocr, &rocr); 668 if (err) 669 return err; 670 671 /* 672 * For SPI, enable CRC as appropriate. 673 */ 674 if (mmc_host_is_spi(host)) { 675 err = mmc_spi_set_crc(host, use_spi_crc); 676 if (err) 677 return err; 678 } 679 680 /* 681 * Allocate card structure. 682 */ 683 card = mmc_alloc_card(host, &sdio_type); 684 if (IS_ERR(card)) 685 return PTR_ERR(card); 686 687 if ((rocr & R4_MEMORY_PRESENT) && 688 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { 689 card->type = MMC_TYPE_SD_COMBO; 690 691 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || 692 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { 693 err = -ENOENT; 694 goto mismatch; 695 } 696 } else { 697 card->type = MMC_TYPE_SDIO; 698 699 if (oldcard && oldcard->type != MMC_TYPE_SDIO) { 700 err = -ENOENT; 701 goto mismatch; 702 } 703 } 704 705 /* 706 * Call the optional HC's init_card function to handle quirks. 707 */ 708 if (host->ops->init_card) 709 host->ops->init_card(host, card); 710 mmc_fixup_device(card, sdio_card_init_methods); 711 712 card->ocr = ocr_card; 713 714 /* 715 * If the host and card support UHS-I mode request the card 716 * to switch to 1.8V signaling level. No 1.8v signalling if 717 * UHS mode is not enabled to maintain compatibility and some 718 * systems that claim 1.8v signalling in fact do not support 719 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already 720 * 1.8v, the card sets S18A to 0 in the R4 response. So it will 721 * fails to check rocr & R4_18V_PRESENT, but we still need to 722 * try to init uhs card. sdio_read_cccr will take over this task 723 * to make sure which speed mode should work. 724 */ 725 if (rocr & ocr & R4_18V_PRESENT) { 726 err = mmc_set_uhs_voltage(host, ocr_card); 727 if (err == -EAGAIN) { 728 mmc_sdio_pre_init(host, ocr_card, card); 729 retries--; 730 goto try_again; 731 } else if (err) { 732 ocr &= ~R4_18V_PRESENT; 733 } 734 } 735 736 /* 737 * For native busses: set card RCA and quit open drain mode. 738 */ 739 if (!mmc_host_is_spi(host)) { 740 err = mmc_send_relative_addr(host, &card->rca); 741 if (err) 742 goto remove; 743 744 /* 745 * Update oldcard with the new RCA received from the SDIO 746 * device -- we're doing this so that it's updated in the 747 * "card" struct when oldcard overwrites that later. 748 */ 749 if (oldcard) 750 oldcard->rca = card->rca; 751 } 752 753 /* 754 * Read CSD, before selecting the card 755 */ 756 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { 757 err = mmc_sd_get_csd(card); 758 if (err) 759 goto remove; 760 761 mmc_decode_cid(card); 762 } 763 764 /* 765 * Select card, as all following commands rely on that. 766 */ 767 if (!mmc_host_is_spi(host)) { 768 err = mmc_select_card(card); 769 if (err) 770 goto remove; 771 } 772 773 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { 774 /* 775 * This is non-standard SDIO device, meaning it doesn't 776 * have any CIA (Common I/O area) registers present. 777 * It's host's responsibility to fill cccr and cis 778 * structures in init_card(). 779 */ 780 mmc_set_clock(host, card->cis.max_dtr); 781 782 if (card->cccr.high_speed) { 783 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 784 } 785 786 if (oldcard) 787 mmc_remove_card(card); 788 else 789 host->card = card; 790 791 return 0; 792 } 793 794 /* 795 * Read the common registers. Note that we should try to 796 * validate whether UHS would work or not. 797 */ 798 err = sdio_read_cccr(card, ocr); 799 if (err) { 800 mmc_sdio_pre_init(host, ocr_card, card); 801 if (ocr & R4_18V_PRESENT) { 802 /* Retry init sequence, but without R4_18V_PRESENT. */ 803 retries = 0; 804 goto try_again; 805 } 806 return err; 807 } 808 809 /* 810 * Read the common CIS tuples. 811 */ 812 err = sdio_read_common_cis(card); 813 if (err) 814 goto remove; 815 816 if (oldcard) { 817 if (card->cis.vendor == oldcard->cis.vendor && 818 card->cis.device == oldcard->cis.device) { 819 mmc_remove_card(card); 820 card = oldcard; 821 } else { 822 err = -ENOENT; 823 goto mismatch; 824 } 825 } 826 827 mmc_fixup_device(card, sdio_fixup_methods); 828 829 if (card->type == MMC_TYPE_SD_COMBO) { 830 err = mmc_sd_setup_card(host, card, oldcard != NULL); 831 /* handle as SDIO-only card if memory init failed */ 832 if (err) { 833 mmc_go_idle(host); 834 if (mmc_host_is_spi(host)) 835 /* should not fail, as it worked previously */ 836 mmc_spi_set_crc(host, use_spi_crc); 837 card->type = MMC_TYPE_SDIO; 838 } else 839 card->dev.type = &sd_type; 840 } 841 842 /* 843 * If needed, disconnect card detection pull-up resistor. 844 */ 845 err = sdio_disable_cd(card); 846 if (err) 847 goto remove; 848 849 /* Initialization sequence for UHS-I cards */ 850 /* Only if card supports 1.8v and UHS signaling */ 851 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { 852 err = mmc_sdio_init_uhs_card(card); 853 if (err) 854 goto remove; 855 } else { 856 /* 857 * Switch to high-speed (if supported). 858 */ 859 err = sdio_enable_hs(card); 860 if (err > 0) 861 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 862 else if (err) 863 goto remove; 864 865 /* 866 * Change to the card's maximum speed. 867 */ 868 mmc_set_clock(host, mmc_sdio_get_max_clock(card)); 869 870 /* 871 * Switch to wider bus (if supported). 872 */ 873 err = sdio_enable_4bit_bus(card); 874 if (err) 875 goto remove; 876 } 877 878 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 879 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 880 pr_err("%s: Host failed to negotiate down from 3.3V\n", 881 mmc_hostname(host)); 882 err = -EINVAL; 883 goto remove; 884 } 885 886 host->card = card; 887 return 0; 888 889 mismatch: 890 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host)); 891 remove: 892 if (oldcard != card) 893 mmc_remove_card(card); 894 return err; 895 } 896 897 static int mmc_sdio_reinit_card(struct mmc_host *host) 898 { 899 int ret; 900 901 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL); 902 if (ret) 903 return ret; 904 905 return mmc_sdio_init_card(host, host->card->ocr, host->card); 906 } 907 908 /* 909 * Host is being removed. Free up the current card. 910 */ 911 static void mmc_sdio_remove(struct mmc_host *host) 912 { 913 int i; 914 915 for (i = 0;i < host->card->sdio_funcs;i++) { 916 if (host->card->sdio_func[i]) { 917 sdio_remove_func(host->card->sdio_func[i]); 918 host->card->sdio_func[i] = NULL; 919 } 920 } 921 922 mmc_remove_card(host->card); 923 host->card = NULL; 924 } 925 926 /* 927 * Card detection - card is alive. 928 */ 929 static int mmc_sdio_alive(struct mmc_host *host) 930 { 931 return mmc_select_card(host->card); 932 } 933 934 /* 935 * Card detection callback from host. 936 */ 937 static void mmc_sdio_detect(struct mmc_host *host) 938 { 939 int err; 940 941 /* Make sure card is powered before detecting it */ 942 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 943 err = pm_runtime_resume_and_get(&host->card->dev); 944 if (err < 0) 945 goto out; 946 } 947 948 mmc_claim_host(host); 949 950 /* 951 * Just check if our card has been removed. 952 */ 953 err = _mmc_detect_card_removed(host); 954 955 mmc_release_host(host); 956 957 /* 958 * Tell PM core it's OK to power off the card now. 959 * 960 * The _sync variant is used in order to ensure that the card 961 * is left powered off in case an error occurred, and the card 962 * is going to be removed. 963 * 964 * Since there is no specific reason to believe a new user 965 * is about to show up at this point, the _sync variant is 966 * desirable anyway. 967 */ 968 if (host->caps & MMC_CAP_POWER_OFF_CARD) 969 pm_runtime_put_sync(&host->card->dev); 970 971 out: 972 if (err) { 973 mmc_sdio_remove(host); 974 975 mmc_claim_host(host); 976 mmc_detach_bus(host); 977 mmc_power_off(host); 978 mmc_release_host(host); 979 } 980 } 981 982 /* 983 * SDIO pre_suspend. We need to suspend all functions separately. 984 * Therefore all registered functions must have drivers with suspend 985 * and resume methods. Failing that we simply remove the whole card. 986 */ 987 static int mmc_sdio_pre_suspend(struct mmc_host *host) 988 { 989 int i; 990 991 for (i = 0; i < host->card->sdio_funcs; i++) { 992 struct sdio_func *func = host->card->sdio_func[i]; 993 if (func && sdio_func_present(func) && func->dev.driver) { 994 const struct dev_pm_ops *pmops = func->dev.driver->pm; 995 if (!pmops || !pmops->suspend || !pmops->resume) 996 /* force removal of entire card in that case */ 997 goto remove; 998 } 999 } 1000 1001 return 0; 1002 1003 remove: 1004 if (!mmc_card_is_removable(host)) { 1005 dev_warn(mmc_dev(host), 1006 "missing suspend/resume ops for non-removable SDIO card\n"); 1007 /* Don't remove a non-removable card - we can't re-detect it. */ 1008 return 0; 1009 } 1010 1011 /* Remove the SDIO card and let it be re-detected later on. */ 1012 mmc_sdio_remove(host); 1013 mmc_claim_host(host); 1014 mmc_detach_bus(host); 1015 mmc_power_off(host); 1016 mmc_release_host(host); 1017 host->pm_flags = 0; 1018 1019 return 0; 1020 } 1021 1022 /* 1023 * SDIO suspend. Suspend all functions separately. 1024 */ 1025 static int mmc_sdio_suspend(struct mmc_host *host) 1026 { 1027 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host)); 1028 1029 /* Prevent processing of SDIO IRQs in suspended state. */ 1030 mmc_card_set_suspended(host->card); 1031 cancel_delayed_work_sync(&host->sdio_irq_work); 1032 1033 mmc_claim_host(host); 1034 1035 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) 1036 sdio_disable_4bit_bus(host->card); 1037 1038 if (!mmc_card_keep_power(host)) { 1039 mmc_power_off(host); 1040 } else if (host->retune_period) { 1041 mmc_retune_timer_stop(host); 1042 mmc_retune_needed(host); 1043 } 1044 1045 mmc_release_host(host); 1046 1047 return 0; 1048 } 1049 1050 static int mmc_sdio_resume(struct mmc_host *host) 1051 { 1052 int err = 0; 1053 1054 /* Basic card reinitialization. */ 1055 mmc_claim_host(host); 1056 1057 /* 1058 * Restore power and reinitialize the card when needed. Note that a 1059 * removable card is checked from a detect work later on in the resume 1060 * process. 1061 */ 1062 if (!mmc_card_keep_power(host)) { 1063 mmc_power_up(host, host->card->ocr); 1064 /* 1065 * Tell runtime PM core we just powered up the card, 1066 * since it still believes the card is powered off. 1067 * Note that currently runtime PM is only enabled 1068 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD 1069 */ 1070 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1071 pm_runtime_disable(&host->card->dev); 1072 pm_runtime_set_active(&host->card->dev); 1073 pm_runtime_enable(&host->card->dev); 1074 } 1075 err = mmc_sdio_reinit_card(host); 1076 } else if (mmc_card_wake_sdio_irq(host)) { 1077 /* We may have switched to 1-bit mode during suspend */ 1078 err = sdio_enable_4bit_bus(host->card); 1079 } 1080 1081 if (err) 1082 goto out; 1083 1084 /* Allow SDIO IRQs to be processed again. */ 1085 mmc_card_clr_suspended(host->card); 1086 1087 if (host->sdio_irqs) { 1088 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) 1089 wake_up_process(host->sdio_irq_thread); 1090 else if (host->caps & MMC_CAP_SDIO_IRQ) 1091 queue_delayed_work(system_wq, &host->sdio_irq_work, 0); 1092 } 1093 1094 out: 1095 mmc_release_host(host); 1096 1097 host->pm_flags &= ~MMC_PM_KEEP_POWER; 1098 return err; 1099 } 1100 1101 static int mmc_sdio_runtime_suspend(struct mmc_host *host) 1102 { 1103 /* No references to the card, cut the power to it. */ 1104 mmc_claim_host(host); 1105 mmc_power_off(host); 1106 mmc_release_host(host); 1107 1108 return 0; 1109 } 1110 1111 static int mmc_sdio_runtime_resume(struct mmc_host *host) 1112 { 1113 int ret; 1114 1115 /* Restore power and re-initialize. */ 1116 mmc_claim_host(host); 1117 mmc_power_up(host, host->card->ocr); 1118 ret = mmc_sdio_reinit_card(host); 1119 mmc_release_host(host); 1120 1121 return ret; 1122 } 1123 1124 /* 1125 * SDIO HW reset 1126 * 1127 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW 1128 * reset was asynchronously scheduled, else a negative error code. 1129 */ 1130 static int mmc_sdio_hw_reset(struct mmc_host *host) 1131 { 1132 struct mmc_card *card = host->card; 1133 1134 /* 1135 * In case the card is shared among multiple func drivers, reset the 1136 * card through a rescan work. In this way it will be removed and 1137 * re-detected, thus all func drivers becomes informed about it. 1138 */ 1139 if (atomic_read(&card->sdio_funcs_probed) > 1) { 1140 if (mmc_card_removed(card)) 1141 return 1; 1142 host->rescan_entered = 0; 1143 mmc_card_set_removed(card); 1144 _mmc_detect_change(host, 0, false); 1145 return 1; 1146 } 1147 1148 /* 1149 * A single func driver has been probed, then let's skip the heavy 1150 * hotplug dance above and execute the reset immediately. 1151 */ 1152 mmc_power_cycle(host, card->ocr); 1153 return mmc_sdio_reinit_card(host); 1154 } 1155 1156 static int mmc_sdio_sw_reset(struct mmc_host *host) 1157 { 1158 mmc_set_clock(host, host->f_init); 1159 sdio_reset(host); 1160 mmc_go_idle(host); 1161 1162 mmc_set_initial_state(host); 1163 mmc_set_initial_signal_voltage(host); 1164 1165 return mmc_sdio_reinit_card(host); 1166 } 1167 1168 static const struct mmc_bus_ops mmc_sdio_ops = { 1169 .remove = mmc_sdio_remove, 1170 .detect = mmc_sdio_detect, 1171 .pre_suspend = mmc_sdio_pre_suspend, 1172 .suspend = mmc_sdio_suspend, 1173 .resume = mmc_sdio_resume, 1174 .runtime_suspend = mmc_sdio_runtime_suspend, 1175 .runtime_resume = mmc_sdio_runtime_resume, 1176 .alive = mmc_sdio_alive, 1177 .hw_reset = mmc_sdio_hw_reset, 1178 .sw_reset = mmc_sdio_sw_reset, 1179 }; 1180 1181 1182 /* 1183 * Starting point for SDIO card init. 1184 */ 1185 int mmc_attach_sdio(struct mmc_host *host) 1186 { 1187 int err, i, funcs; 1188 u32 ocr, rocr; 1189 struct mmc_card *card; 1190 1191 WARN_ON(!host->claimed); 1192 1193 err = mmc_send_io_op_cond(host, 0, &ocr); 1194 if (err) 1195 return err; 1196 1197 mmc_attach_bus(host, &mmc_sdio_ops); 1198 if (host->ocr_avail_sdio) 1199 host->ocr_avail = host->ocr_avail_sdio; 1200 1201 1202 rocr = mmc_select_voltage(host, ocr); 1203 1204 /* 1205 * Can we support the voltage(s) of the card(s)? 1206 */ 1207 if (!rocr) { 1208 err = -EINVAL; 1209 goto err; 1210 } 1211 1212 /* 1213 * Detect and init the card. 1214 */ 1215 err = mmc_sdio_init_card(host, rocr, NULL); 1216 if (err) 1217 goto err; 1218 1219 card = host->card; 1220 1221 /* 1222 * Enable runtime PM only if supported by host+card+board 1223 */ 1224 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1225 /* 1226 * Do not allow runtime suspend until after SDIO function 1227 * devices are added. 1228 */ 1229 pm_runtime_get_noresume(&card->dev); 1230 1231 /* 1232 * Let runtime PM core know our card is active 1233 */ 1234 err = pm_runtime_set_active(&card->dev); 1235 if (err) 1236 goto remove; 1237 1238 /* 1239 * Enable runtime PM for this card 1240 */ 1241 pm_runtime_enable(&card->dev); 1242 } 1243 1244 /* 1245 * The number of functions on the card is encoded inside 1246 * the ocr. 1247 */ 1248 funcs = (ocr & 0x70000000) >> 28; 1249 card->sdio_funcs = 0; 1250 1251 /* 1252 * Initialize (but don't add) all present functions. 1253 */ 1254 for (i = 0; i < funcs; i++, card->sdio_funcs++) { 1255 err = sdio_init_func(host->card, i + 1); 1256 if (err) 1257 goto remove; 1258 1259 /* 1260 * Enable Runtime PM for this func (if supported) 1261 */ 1262 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1263 pm_runtime_enable(&card->sdio_func[i]->dev); 1264 } 1265 1266 /* 1267 * First add the card to the driver model... 1268 */ 1269 mmc_release_host(host); 1270 err = mmc_add_card(host->card); 1271 if (err) 1272 goto remove_added; 1273 1274 /* 1275 * ...then the SDIO functions. 1276 */ 1277 for (i = 0;i < funcs;i++) { 1278 err = sdio_add_func(host->card->sdio_func[i]); 1279 if (err) 1280 goto remove_added; 1281 } 1282 1283 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1284 pm_runtime_put(&card->dev); 1285 1286 mmc_claim_host(host); 1287 return 0; 1288 1289 1290 remove: 1291 mmc_release_host(host); 1292 remove_added: 1293 /* 1294 * The devices are being deleted so it is not necessary to disable 1295 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card 1296 * because it needs to be active to remove any function devices that 1297 * were probed, and after that it gets deleted. 1298 */ 1299 mmc_sdio_remove(host); 1300 mmc_claim_host(host); 1301 err: 1302 mmc_detach_bus(host); 1303 1304 pr_err("%s: error %d whilst initialising SDIO card\n", 1305 mmc_hostname(host), err); 1306 1307 return err; 1308 } 1309 1310