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 #include <linux/sysfs.h> 11 12 #include <linux/mmc/host.h> 13 #include <linux/mmc/card.h> 14 #include <linux/mmc/mmc.h> 15 #include <linux/mmc/sdio.h> 16 #include <linux/mmc/sdio_func.h> 17 #include <linux/mmc/sdio_ids.h> 18 19 #include "core.h" 20 #include "card.h" 21 #include "host.h" 22 #include "bus.h" 23 #include "quirks.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 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); 32 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); 33 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); 34 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 35 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 36 37 #define sdio_info_attr(num) \ 38 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 39 { \ 40 struct mmc_card *card = mmc_dev_to_card(dev); \ 41 \ 42 if (num > card->num_info) \ 43 return -ENODATA; \ 44 if (!card->info[num - 1][0]) \ 45 return 0; \ 46 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \ 47 } \ 48 static DEVICE_ATTR_RO(info##num) 49 50 sdio_info_attr(1); 51 sdio_info_attr(2); 52 sdio_info_attr(3); 53 sdio_info_attr(4); 54 55 static struct attribute *sdio_std_attrs[] = { 56 &dev_attr_vendor.attr, 57 &dev_attr_device.attr, 58 &dev_attr_revision.attr, 59 &dev_attr_info1.attr, 60 &dev_attr_info2.attr, 61 &dev_attr_info3.attr, 62 &dev_attr_info4.attr, 63 &dev_attr_ocr.attr, 64 &dev_attr_rca.attr, 65 NULL, 66 }; 67 ATTRIBUTE_GROUPS(sdio_std); 68 69 static const struct device_type sdio_type = { 70 .groups = sdio_std_groups, 71 }; 72 73 static int sdio_read_fbr(struct sdio_func *func) 74 { 75 int ret; 76 unsigned char data; 77 78 if (mmc_card_nonstd_func_interface(func->card)) { 79 func->class = SDIO_CLASS_NONE; 80 return 0; 81 } 82 83 ret = mmc_io_rw_direct(func->card, 0, 0, 84 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); 85 if (ret) 86 goto out; 87 88 data &= 0x0f; 89 90 if (data == 0x0f) { 91 ret = mmc_io_rw_direct(func->card, 0, 0, 92 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); 93 if (ret) 94 goto out; 95 } 96 97 func->class = data; 98 99 out: 100 return ret; 101 } 102 103 static int sdio_init_func(struct mmc_card *card, unsigned int fn) 104 { 105 int ret; 106 struct sdio_func *func; 107 108 if (WARN_ON(fn > SDIO_MAX_FUNCS)) 109 return -EINVAL; 110 111 func = sdio_alloc_func(card); 112 if (IS_ERR(func)) 113 return PTR_ERR(func); 114 115 func->num = fn; 116 117 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) { 118 ret = sdio_read_fbr(func); 119 if (ret) 120 goto fail; 121 122 ret = sdio_read_func_cis(func); 123 if (ret) 124 goto fail; 125 } else { 126 func->vendor = func->card->cis.vendor; 127 func->device = func->card->cis.device; 128 func->max_blksize = func->card->cis.blksize; 129 } 130 131 card->sdio_func[fn - 1] = func; 132 133 return 0; 134 135 fail: 136 /* 137 * It is okay to remove the function here even though we hold 138 * the host lock as we haven't registered the device yet. 139 */ 140 sdio_remove_func(func); 141 return ret; 142 } 143 144 static int sdio_read_cccr(struct mmc_card *card, u32 ocr) 145 { 146 int ret; 147 int cccr_vsn; 148 int uhs = ocr & R4_18V_PRESENT; 149 unsigned char data; 150 unsigned char speed; 151 152 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); 153 if (ret) 154 goto out; 155 156 cccr_vsn = data & 0x0f; 157 158 if (cccr_vsn > SDIO_CCCR_REV_3_00) { 159 pr_err("%s: unrecognised CCCR structure version %d\n", 160 mmc_hostname(card->host), cccr_vsn); 161 return -EINVAL; 162 } 163 164 card->cccr.sdio_vsn = (data & 0xf0) >> 4; 165 166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); 167 if (ret) 168 goto out; 169 170 if (data & SDIO_CCCR_CAP_SMB) 171 card->cccr.multi_block = 1; 172 if (data & SDIO_CCCR_CAP_LSC) 173 card->cccr.low_speed = 1; 174 if (data & SDIO_CCCR_CAP_4BLS) 175 card->cccr.wide_bus = 1; 176 177 if (cccr_vsn >= SDIO_CCCR_REV_1_10) { 178 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); 179 if (ret) 180 goto out; 181 182 if (data & SDIO_POWER_SMPC) 183 card->cccr.high_power = 1; 184 } 185 186 if (cccr_vsn >= SDIO_CCCR_REV_1_20) { 187 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 188 if (ret) 189 goto out; 190 191 card->scr.sda_spec3 = 0; 192 card->sw_caps.sd3_bus_mode = 0; 193 card->sw_caps.sd3_drv_type = 0; 194 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) { 195 card->scr.sda_spec3 = 1; 196 ret = mmc_io_rw_direct(card, 0, 0, 197 SDIO_CCCR_UHS, 0, &data); 198 if (ret) 199 goto out; 200 201 if (mmc_host_can_uhs(card->host)) { 202 if (data & SDIO_UHS_DDR50) 203 card->sw_caps.sd3_bus_mode 204 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50 205 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12; 206 207 if (data & SDIO_UHS_SDR50) 208 card->sw_caps.sd3_bus_mode 209 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25 210 | SD_MODE_UHS_SDR12; 211 212 if (data & SDIO_UHS_SDR104) 213 card->sw_caps.sd3_bus_mode 214 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50 215 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12; 216 } 217 218 ret = mmc_io_rw_direct(card, 0, 0, 219 SDIO_CCCR_DRIVE_STRENGTH, 0, &data); 220 if (ret) 221 goto out; 222 223 if (data & SDIO_DRIVE_SDTA) 224 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; 225 if (data & SDIO_DRIVE_SDTC) 226 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; 227 if (data & SDIO_DRIVE_SDTD) 228 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; 229 230 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0, &data); 231 if (ret) 232 goto out; 233 234 if (data & SDIO_INTERRUPT_EXT_SAI) { 235 data |= SDIO_INTERRUPT_EXT_EAI; 236 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT, 237 data, NULL); 238 if (ret) 239 goto out; 240 241 card->cccr.enable_async_irq = 1; 242 } 243 } 244 245 /* if no uhs mode ensure we check for high speed */ 246 if (!card->sw_caps.sd3_bus_mode) { 247 if (speed & SDIO_SPEED_SHS) { 248 card->cccr.high_speed = 1; 249 card->sw_caps.hs_max_dtr = 50000000; 250 } else { 251 card->cccr.high_speed = 0; 252 card->sw_caps.hs_max_dtr = 25000000; 253 } 254 } 255 } 256 257 out: 258 return ret; 259 } 260 261 static int sdio_enable_wide(struct mmc_card *card) 262 { 263 int ret; 264 u8 ctrl; 265 266 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 267 return 0; 268 269 if (card->cccr.low_speed && !card->cccr.wide_bus) 270 return 0; 271 272 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 273 if (ret) 274 return ret; 275 276 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) 277 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", 278 mmc_hostname(card->host), ctrl); 279 280 /* set as 4-bit bus width */ 281 ctrl &= ~SDIO_BUS_WIDTH_MASK; 282 ctrl |= SDIO_BUS_WIDTH_4BIT; 283 284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 285 if (ret) 286 return ret; 287 288 return 1; 289 } 290 291 /* 292 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) 293 * of the card. This may be required on certain setups of boards, 294 * controllers and embedded sdio device which do not need the card's 295 * pull-up. As a result, card detection is disabled and power is saved. 296 */ 297 static int sdio_disable_cd(struct mmc_card *card) 298 { 299 int ret; 300 u8 ctrl; 301 302 if (!mmc_card_disable_cd(card)) 303 return 0; 304 305 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 306 if (ret) 307 return ret; 308 309 ctrl |= SDIO_BUS_CD_DISABLE; 310 311 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 312 } 313 314 /* 315 * Devices that remain active during a system suspend are 316 * put back into 1-bit mode. 317 */ 318 static int sdio_disable_wide(struct mmc_card *card) 319 { 320 int ret; 321 u8 ctrl; 322 323 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 324 return 0; 325 326 if (card->cccr.low_speed && !card->cccr.wide_bus) 327 return 0; 328 329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); 330 if (ret) 331 return ret; 332 333 if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) 334 return 0; 335 336 ctrl &= ~SDIO_BUS_WIDTH_4BIT; 337 ctrl |= SDIO_BUS_ASYNC_INT; 338 339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); 340 if (ret) 341 return ret; 342 343 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); 344 345 return 0; 346 } 347 348 static int sdio_disable_4bit_bus(struct mmc_card *card) 349 { 350 int err; 351 352 if (mmc_card_sdio(card)) 353 goto out; 354 355 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) 356 return 0; 357 358 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) 359 return 0; 360 361 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); 362 if (err) 363 return err; 364 365 out: 366 return sdio_disable_wide(card); 367 } 368 369 370 static int sdio_enable_4bit_bus(struct mmc_card *card) 371 { 372 int err; 373 374 err = sdio_enable_wide(card); 375 if (err <= 0) 376 return err; 377 if (mmc_card_sdio(card)) 378 goto out; 379 380 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) { 381 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 382 if (err) { 383 sdio_disable_wide(card); 384 return err; 385 } 386 } 387 out: 388 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 389 390 return 0; 391 } 392 393 394 /* 395 * Test if the card supports high-speed mode and, if so, switch to it. 396 */ 397 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) 398 { 399 int ret; 400 u8 speed; 401 402 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 403 return 0; 404 405 if (!card->cccr.high_speed) 406 return 0; 407 408 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 409 if (ret) 410 return ret; 411 412 if (enable) 413 speed |= SDIO_SPEED_EHS; 414 else 415 speed &= ~SDIO_SPEED_EHS; 416 417 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 418 if (ret) 419 return ret; 420 421 return 1; 422 } 423 424 /* 425 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. 426 */ 427 static int sdio_enable_hs(struct mmc_card *card) 428 { 429 int ret; 430 431 ret = mmc_sdio_switch_hs(card, true); 432 if (ret <= 0 || mmc_card_sdio(card)) 433 return ret; 434 435 ret = mmc_sd_switch_hs(card); 436 if (ret <= 0) 437 mmc_sdio_switch_hs(card, false); 438 439 return ret; 440 } 441 442 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) 443 { 444 unsigned max_dtr; 445 446 if (mmc_card_hs(card)) { 447 /* 448 * The SDIO specification doesn't mention how 449 * the CIS transfer speed register relates to 450 * high-speed, but it seems that 50 MHz is 451 * mandatory. 452 */ 453 max_dtr = 50000000; 454 } else { 455 max_dtr = card->cis.max_dtr; 456 } 457 458 if (mmc_card_sd_combo(card)) 459 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); 460 461 max_dtr = min_not_zero(max_dtr, card->quirk_max_rate); 462 463 return max_dtr; 464 } 465 466 static unsigned char host_drive_to_sdio_drive(int host_strength) 467 { 468 switch (host_strength) { 469 case MMC_SET_DRIVER_TYPE_A: 470 return SDIO_DTSx_SET_TYPE_A; 471 case MMC_SET_DRIVER_TYPE_B: 472 return SDIO_DTSx_SET_TYPE_B; 473 case MMC_SET_DRIVER_TYPE_C: 474 return SDIO_DTSx_SET_TYPE_C; 475 case MMC_SET_DRIVER_TYPE_D: 476 return SDIO_DTSx_SET_TYPE_D; 477 default: 478 return SDIO_DTSx_SET_TYPE_B; 479 } 480 } 481 482 static void sdio_select_driver_type(struct mmc_card *card) 483 { 484 int card_drv_type, drive_strength, drv_type; 485 unsigned char card_strength; 486 int err; 487 488 card->drive_strength = 0; 489 490 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 491 492 drive_strength = mmc_select_drive_strength(card, 493 card->sw_caps.uhs_max_dtr, 494 card_drv_type, &drv_type); 495 496 if (drive_strength) { 497 /* if error just use default for drive strength B */ 498 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, 499 &card_strength); 500 if (err) 501 return; 502 503 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); 504 card_strength |= host_drive_to_sdio_drive(drive_strength); 505 506 /* if error default to drive strength B */ 507 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, 508 card_strength, NULL); 509 if (err) 510 return; 511 card->drive_strength = drive_strength; 512 } 513 514 if (drv_type) 515 mmc_set_driver_type(card->host, drv_type); 516 } 517 518 519 static int sdio_set_bus_speed_mode(struct mmc_card *card) 520 { 521 unsigned int bus_speed, timing; 522 int err; 523 unsigned char speed; 524 unsigned int max_rate; 525 526 /* 527 * If the host doesn't support any of the UHS-I modes, fallback on 528 * default speed. 529 */ 530 if (!mmc_host_can_uhs(card->host)) 531 return 0; 532 533 bus_speed = SDIO_SPEED_SDR12; 534 timing = MMC_TIMING_UHS_SDR12; 535 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 536 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 537 bus_speed = SDIO_SPEED_SDR104; 538 timing = MMC_TIMING_UHS_SDR104; 539 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 540 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 541 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 542 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 543 bus_speed = SDIO_SPEED_DDR50; 544 timing = MMC_TIMING_UHS_DDR50; 545 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 546 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 547 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 548 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 549 SD_MODE_UHS_SDR50)) { 550 bus_speed = SDIO_SPEED_SDR50; 551 timing = MMC_TIMING_UHS_SDR50; 552 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 553 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 554 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 555 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 556 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 557 bus_speed = SDIO_SPEED_SDR25; 558 timing = MMC_TIMING_UHS_SDR25; 559 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 560 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 561 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 562 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 563 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 564 SD_MODE_UHS_SDR12)) { 565 bus_speed = SDIO_SPEED_SDR12; 566 timing = MMC_TIMING_UHS_SDR12; 567 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 568 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 569 } 570 571 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 572 if (err) 573 return err; 574 575 speed &= ~SDIO_SPEED_BSS_MASK; 576 speed |= bus_speed; 577 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 578 if (err) 579 return err; 580 581 max_rate = min_not_zero(card->quirk_max_rate, 582 card->sw_caps.uhs_max_dtr); 583 584 mmc_set_timing(card->host, timing); 585 mmc_set_clock(card->host, max_rate); 586 587 return 0; 588 } 589 590 /* 591 * UHS-I specific initialization procedure 592 */ 593 static int mmc_sdio_init_uhs_card(struct mmc_card *card) 594 { 595 int err; 596 597 if (!card->scr.sda_spec3) 598 return 0; 599 600 /* Switch to wider bus */ 601 err = sdio_enable_4bit_bus(card); 602 if (err) 603 goto out; 604 605 /* Set the driver strength for the card */ 606 sdio_select_driver_type(card); 607 608 /* Set bus speed mode of the card */ 609 err = sdio_set_bus_speed_mode(card); 610 if (err) 611 goto out; 612 613 /* 614 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 615 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 616 */ 617 if (!mmc_host_is_spi(card->host) && 618 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) || 619 (card->host->ios.timing == MMC_TIMING_UHS_SDR104))) 620 err = mmc_execute_tuning(card); 621 out: 622 return err; 623 } 624 625 static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr, 626 struct mmc_card *card) 627 { 628 if (card) 629 mmc_remove_card(card); 630 631 /* 632 * Reset the card by performing the same steps that are taken by 633 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. 634 * 635 * sdio_reset() is technically not needed. Having just powered up the 636 * hardware, it should already be in reset state. However, some 637 * platforms (such as SD8686 on OLPC) do not instantly cut power, 638 * meaning that a reset is required when restoring power soon after 639 * powering off. It is harmless in other cases. 640 * 641 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, 642 * is not necessary for non-removable cards. However, it is required 643 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and 644 * harmless in other situations. 645 * 646 */ 647 648 sdio_reset(host); 649 mmc_go_idle(host); 650 mmc_send_if_cond(host, ocr); 651 return mmc_send_io_op_cond(host, 0, NULL); 652 } 653 654 /* 655 * Handle the detection and initialisation of a card. 656 * 657 * In the case of a resume, "oldcard" will contain the card 658 * we're trying to reinitialise. 659 */ 660 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 661 struct mmc_card *oldcard) 662 { 663 struct mmc_card *card; 664 int err; 665 int retries = 10; 666 u32 rocr = 0; 667 u32 ocr_card = ocr; 668 669 WARN_ON(!host->claimed); 670 671 /* to query card if 1.8V signalling is supported */ 672 if (mmc_host_can_uhs(host)) 673 ocr |= R4_18V_PRESENT; 674 675 try_again: 676 if (!retries) { 677 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 678 ocr &= ~R4_18V_PRESENT; 679 } 680 681 /* 682 * Inform the card of the voltage 683 */ 684 err = mmc_send_io_op_cond(host, ocr, &rocr); 685 if (err) 686 return err; 687 688 /* 689 * For SPI, enable CRC as appropriate. 690 */ 691 if (mmc_host_is_spi(host)) { 692 err = mmc_spi_set_crc(host, use_spi_crc); 693 if (err) 694 return err; 695 } 696 697 /* 698 * Allocate card structure. 699 */ 700 card = mmc_alloc_card(host, &sdio_type); 701 if (IS_ERR(card)) 702 return PTR_ERR(card); 703 704 if ((rocr & R4_MEMORY_PRESENT) && 705 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { 706 card->type = MMC_TYPE_SD_COMBO; 707 708 if (oldcard && (!mmc_card_sd_combo(oldcard) || 709 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { 710 err = -ENOENT; 711 goto mismatch; 712 } 713 } else { 714 card->type = MMC_TYPE_SDIO; 715 716 if (oldcard && !mmc_card_sdio(oldcard)) { 717 err = -ENOENT; 718 goto mismatch; 719 } 720 } 721 722 /* 723 * Call the optional HC's init_card function to handle quirks. 724 */ 725 if (host->ops->init_card) 726 host->ops->init_card(host, card); 727 mmc_fixup_device(card, sdio_card_init_methods); 728 729 card->ocr = ocr_card; 730 731 /* 732 * If the host and card support UHS-I mode request the card 733 * to switch to 1.8V signaling level. No 1.8v signalling if 734 * UHS mode is not enabled to maintain compatibility and some 735 * systems that claim 1.8v signalling in fact do not support 736 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already 737 * 1.8v, the card sets S18A to 0 in the R4 response. So it will 738 * fails to check rocr & R4_18V_PRESENT, but we still need to 739 * try to init uhs card. sdio_read_cccr will take over this task 740 * to make sure which speed mode should work. 741 */ 742 if (rocr & ocr & R4_18V_PRESENT) { 743 err = mmc_set_uhs_voltage(host, ocr_card); 744 if (err == -EAGAIN) { 745 mmc_sdio_pre_init(host, ocr_card, card); 746 retries--; 747 goto try_again; 748 } else if (err) { 749 ocr &= ~R4_18V_PRESENT; 750 } 751 } 752 753 /* 754 * For native busses: set card RCA and quit open drain mode. 755 */ 756 if (!mmc_host_is_spi(host)) { 757 err = mmc_send_relative_addr(host, &card->rca); 758 if (err) 759 goto remove; 760 761 /* 762 * Update oldcard with the new RCA received from the SDIO 763 * device -- we're doing this so that it's updated in the 764 * "card" struct when oldcard overwrites that later. 765 */ 766 if (oldcard) 767 oldcard->rca = card->rca; 768 } 769 770 /* 771 * Read CSD, before selecting the card 772 */ 773 if (!oldcard && mmc_card_sd_combo(card)) { 774 err = mmc_sd_get_csd(card, false); 775 if (err) 776 goto remove; 777 778 mmc_decode_cid(card); 779 } 780 781 /* 782 * Select card, as all following commands rely on that. 783 */ 784 if (!mmc_host_is_spi(host)) { 785 err = mmc_select_card(card); 786 if (err) 787 goto remove; 788 } 789 790 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { 791 /* 792 * This is non-standard SDIO device, meaning it doesn't 793 * have any CIA (Common I/O area) registers present. 794 * It's host's responsibility to fill cccr and cis 795 * structures in init_card(). 796 */ 797 mmc_set_clock(host, card->cis.max_dtr); 798 799 if (card->cccr.high_speed) { 800 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 801 } 802 803 if (oldcard) 804 mmc_remove_card(card); 805 else 806 host->card = card; 807 808 return 0; 809 } 810 811 /* 812 * Read the common registers. Note that we should try to 813 * validate whether UHS would work or not. 814 */ 815 err = sdio_read_cccr(card, ocr); 816 if (err) { 817 mmc_sdio_pre_init(host, ocr_card, card); 818 if (ocr & R4_18V_PRESENT) { 819 /* Retry init sequence, but without R4_18V_PRESENT. */ 820 retries = 0; 821 goto try_again; 822 } 823 return err; 824 } 825 826 /* 827 * Read the common CIS tuples. 828 */ 829 err = sdio_read_common_cis(card); 830 if (err) 831 goto remove; 832 833 if (oldcard) { 834 if (card->cis.vendor == oldcard->cis.vendor && 835 card->cis.device == oldcard->cis.device) { 836 mmc_remove_card(card); 837 card = oldcard; 838 } else { 839 err = -ENOENT; 840 goto mismatch; 841 } 842 } 843 844 mmc_fixup_device(card, sdio_fixup_methods); 845 846 if (mmc_card_sd_combo(card)) { 847 err = mmc_sd_setup_card(host, card, oldcard != NULL); 848 /* handle as SDIO-only card if memory init failed */ 849 if (err) { 850 mmc_go_idle(host); 851 if (mmc_host_is_spi(host)) 852 /* should not fail, as it worked previously */ 853 mmc_spi_set_crc(host, use_spi_crc); 854 card->type = MMC_TYPE_SDIO; 855 } else 856 card->dev.type = &sd_type; 857 } 858 859 /* 860 * If needed, disconnect card detection pull-up resistor. 861 */ 862 err = sdio_disable_cd(card); 863 if (err) 864 goto remove; 865 866 /* Initialization sequence for UHS-I cards */ 867 /* Only if card supports 1.8v and UHS signaling */ 868 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { 869 err = mmc_sdio_init_uhs_card(card); 870 if (err) 871 goto remove; 872 } else { 873 /* 874 * Switch to high-speed (if supported). 875 */ 876 err = sdio_enable_hs(card); 877 if (err > 0) 878 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 879 else if (err) 880 goto remove; 881 882 /* 883 * Change to the card's maximum speed. 884 */ 885 mmc_set_clock(host, mmc_sdio_get_max_clock(card)); 886 887 /* 888 * Switch to wider bus (if supported). 889 */ 890 err = sdio_enable_4bit_bus(card); 891 if (err) 892 goto remove; 893 } 894 895 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 896 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 897 pr_err("%s: Host failed to negotiate down from 3.3V\n", 898 mmc_hostname(host)); 899 err = -EINVAL; 900 goto remove; 901 } 902 903 host->card = card; 904 return 0; 905 906 mismatch: 907 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host)); 908 remove: 909 if (oldcard != card) 910 mmc_remove_card(card); 911 return err; 912 } 913 914 static int mmc_sdio_reinit_card(struct mmc_host *host) 915 { 916 int ret; 917 918 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL); 919 if (ret) 920 return ret; 921 922 return mmc_sdio_init_card(host, host->card->ocr, host->card); 923 } 924 925 /* 926 * Host is being removed. Free up the current card. 927 */ 928 static void mmc_sdio_remove(struct mmc_host *host) 929 { 930 int i; 931 932 for (i = 0;i < host->card->sdio_funcs;i++) { 933 if (host->card->sdio_func[i]) { 934 sdio_remove_func(host->card->sdio_func[i]); 935 host->card->sdio_func[i] = NULL; 936 } 937 } 938 939 mmc_remove_card(host->card); 940 host->card = NULL; 941 } 942 943 /* 944 * Card detection - card is alive. 945 */ 946 static int mmc_sdio_alive(struct mmc_host *host) 947 { 948 if (!mmc_host_is_spi(host)) 949 return mmc_select_card(host->card); 950 else 951 return mmc_io_rw_direct(host->card, 0, 0, SDIO_CCCR_CCCR, 0, 952 NULL); 953 } 954 955 /* 956 * Card detection callback from host. 957 */ 958 static void mmc_sdio_detect(struct mmc_host *host) 959 { 960 int err; 961 962 /* Make sure card is powered before detecting it */ 963 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 964 err = pm_runtime_resume_and_get(&host->card->dev); 965 if (err < 0) 966 goto out; 967 } 968 969 mmc_claim_host(host); 970 971 /* 972 * Just check if our card has been removed. 973 */ 974 err = _mmc_detect_card_removed(host); 975 976 mmc_release_host(host); 977 978 /* 979 * Tell PM core it's OK to power off the card now. 980 * 981 * The _sync variant is used in order to ensure that the card 982 * is left powered off in case an error occurred, and the card 983 * is going to be removed. 984 * 985 * Since there is no specific reason to believe a new user 986 * is about to show up at this point, the _sync variant is 987 * desirable anyway. 988 */ 989 if (host->caps & MMC_CAP_POWER_OFF_CARD) 990 pm_runtime_put_sync(&host->card->dev); 991 992 out: 993 if (err) { 994 mmc_sdio_remove(host); 995 996 mmc_claim_host(host); 997 mmc_detach_bus(host); 998 mmc_power_off(host); 999 mmc_release_host(host); 1000 } 1001 } 1002 1003 /* 1004 * SDIO pre_suspend. We need to suspend all functions separately. 1005 * Therefore all registered functions must have drivers with suspend 1006 * and resume methods. Failing that we simply remove the whole card. 1007 */ 1008 static int mmc_sdio_pre_suspend(struct mmc_host *host) 1009 { 1010 int i; 1011 1012 for (i = 0; i < host->card->sdio_funcs; i++) { 1013 struct sdio_func *func = host->card->sdio_func[i]; 1014 if (func && sdio_func_present(func) && func->dev.driver) { 1015 const struct dev_pm_ops *pmops = func->dev.driver->pm; 1016 if (!pmops || !pmops->suspend || !pmops->resume) 1017 /* force removal of entire card in that case */ 1018 goto remove; 1019 } 1020 } 1021 1022 return 0; 1023 1024 remove: 1025 if (!mmc_card_is_removable(host)) { 1026 dev_warn(mmc_dev(host), 1027 "missing suspend/resume ops for non-removable SDIO card\n"); 1028 /* Don't remove a non-removable card - we can't re-detect it. */ 1029 return 0; 1030 } 1031 1032 /* Remove the SDIO card and let it be re-detected later on. */ 1033 mmc_sdio_remove(host); 1034 mmc_claim_host(host); 1035 mmc_detach_bus(host); 1036 mmc_power_off(host); 1037 mmc_release_host(host); 1038 host->pm_flags = 0; 1039 1040 return 0; 1041 } 1042 1043 /* 1044 * SDIO suspend. Suspend all functions separately. 1045 */ 1046 static int mmc_sdio_suspend(struct mmc_host *host) 1047 { 1048 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host)); 1049 1050 /* Prevent processing of SDIO IRQs in suspended state. */ 1051 mmc_card_set_suspended(host->card); 1052 cancel_work_sync(&host->sdio_irq_work); 1053 1054 mmc_claim_host(host); 1055 1056 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) 1057 sdio_disable_4bit_bus(host->card); 1058 1059 if (!mmc_card_keep_power(host)) { 1060 mmc_power_off(host); 1061 } else if (host->retune_period) { 1062 mmc_retune_timer_stop(host); 1063 mmc_retune_needed(host); 1064 } 1065 1066 mmc_release_host(host); 1067 1068 return 0; 1069 } 1070 1071 static int mmc_sdio_resume(struct mmc_host *host) 1072 { 1073 int err = 0; 1074 1075 /* Basic card reinitialization. */ 1076 mmc_claim_host(host); 1077 1078 /* 1079 * Restore power and reinitialize the card when needed. Note that a 1080 * removable card is checked from a detect work later on in the resume 1081 * process. 1082 */ 1083 if (!mmc_card_keep_power(host)) { 1084 mmc_power_up(host, host->card->ocr); 1085 /* 1086 * Tell runtime PM core we just powered up the card, 1087 * since it still believes the card is powered off. 1088 * Note that currently runtime PM is only enabled 1089 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD 1090 */ 1091 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1092 pm_runtime_disable(&host->card->dev); 1093 pm_runtime_set_active(&host->card->dev); 1094 pm_runtime_enable(&host->card->dev); 1095 } 1096 err = mmc_sdio_reinit_card(host); 1097 } else if (mmc_card_wake_sdio_irq(host)) { 1098 /* 1099 * We may have switched to 1-bit mode during suspend, 1100 * need to hold retuning, because tuning only supprt 1101 * 4-bit mode or 8 bit mode. 1102 */ 1103 mmc_retune_hold_now(host); 1104 err = sdio_enable_4bit_bus(host->card); 1105 mmc_retune_release(host); 1106 } 1107 1108 if (err) 1109 goto out; 1110 1111 /* Allow SDIO IRQs to be processed again. */ 1112 mmc_card_clr_suspended(host->card); 1113 1114 if (host->sdio_irqs) { 1115 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) 1116 wake_up_process(host->sdio_irq_thread); 1117 else if (host->caps & MMC_CAP_SDIO_IRQ) 1118 schedule_work(&host->sdio_irq_work); 1119 } 1120 1121 out: 1122 mmc_release_host(host); 1123 1124 host->pm_flags &= ~MMC_PM_KEEP_POWER; 1125 return err; 1126 } 1127 1128 static int mmc_sdio_runtime_suspend(struct mmc_host *host) 1129 { 1130 /* No references to the card, cut the power to it. */ 1131 mmc_claim_host(host); 1132 mmc_power_off(host); 1133 mmc_release_host(host); 1134 1135 return 0; 1136 } 1137 1138 static int mmc_sdio_runtime_resume(struct mmc_host *host) 1139 { 1140 int ret; 1141 1142 /* Restore power and re-initialize. */ 1143 mmc_claim_host(host); 1144 mmc_power_up(host, host->card->ocr); 1145 ret = mmc_sdio_reinit_card(host); 1146 mmc_release_host(host); 1147 1148 return ret; 1149 } 1150 1151 /* 1152 * SDIO HW reset 1153 * 1154 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW 1155 * reset was asynchronously scheduled, else a negative error code. 1156 */ 1157 static int mmc_sdio_hw_reset(struct mmc_host *host) 1158 { 1159 struct mmc_card *card = host->card; 1160 1161 /* 1162 * In case the card is shared among multiple func drivers, reset the 1163 * card through a rescan work. In this way it will be removed and 1164 * re-detected, thus all func drivers becomes informed about it. 1165 */ 1166 if (atomic_read(&card->sdio_funcs_probed) > 1) { 1167 if (mmc_card_removed(card)) 1168 return 1; 1169 host->rescan_entered = 0; 1170 mmc_card_set_removed(card); 1171 _mmc_detect_change(host, 0, false); 1172 return 1; 1173 } 1174 1175 /* 1176 * A single func driver has been probed, then let's skip the heavy 1177 * hotplug dance above and execute the reset immediately. 1178 */ 1179 mmc_power_cycle(host, card->ocr); 1180 return mmc_sdio_reinit_card(host); 1181 } 1182 1183 static int mmc_sdio_sw_reset(struct mmc_host *host) 1184 { 1185 mmc_set_clock(host, host->f_init); 1186 sdio_reset(host); 1187 mmc_go_idle(host); 1188 1189 mmc_set_initial_state(host); 1190 mmc_set_initial_signal_voltage(host); 1191 1192 return mmc_sdio_reinit_card(host); 1193 } 1194 1195 static const struct mmc_bus_ops mmc_sdio_ops = { 1196 .remove = mmc_sdio_remove, 1197 .detect = mmc_sdio_detect, 1198 .pre_suspend = mmc_sdio_pre_suspend, 1199 .suspend = mmc_sdio_suspend, 1200 .resume = mmc_sdio_resume, 1201 .runtime_suspend = mmc_sdio_runtime_suspend, 1202 .runtime_resume = mmc_sdio_runtime_resume, 1203 .alive = mmc_sdio_alive, 1204 .hw_reset = mmc_sdio_hw_reset, 1205 .sw_reset = mmc_sdio_sw_reset, 1206 }; 1207 1208 1209 /* 1210 * Starting point for SDIO card init. 1211 */ 1212 int mmc_attach_sdio(struct mmc_host *host) 1213 { 1214 int err, i, funcs; 1215 u32 ocr, rocr; 1216 struct mmc_card *card; 1217 1218 WARN_ON(!host->claimed); 1219 1220 err = mmc_send_io_op_cond(host, 0, &ocr); 1221 if (err) 1222 return err; 1223 1224 mmc_attach_bus(host, &mmc_sdio_ops); 1225 if (host->ocr_avail_sdio) 1226 host->ocr_avail = host->ocr_avail_sdio; 1227 1228 1229 rocr = mmc_select_voltage(host, ocr); 1230 1231 /* 1232 * Can we support the voltage(s) of the card(s)? 1233 */ 1234 if (!rocr) { 1235 err = -EINVAL; 1236 goto err; 1237 } 1238 1239 /* 1240 * Detect and init the card. 1241 */ 1242 err = mmc_sdio_init_card(host, rocr, NULL); 1243 if (err) 1244 goto err; 1245 1246 card = host->card; 1247 1248 /* 1249 * Enable runtime PM only if supported by host+card+board 1250 */ 1251 if (host->caps & MMC_CAP_POWER_OFF_CARD) { 1252 /* 1253 * Do not allow runtime suspend until after SDIO function 1254 * devices are added. 1255 */ 1256 pm_runtime_get_noresume(&card->dev); 1257 1258 /* 1259 * Let runtime PM core know our card is active 1260 */ 1261 err = pm_runtime_set_active(&card->dev); 1262 if (err) 1263 goto remove; 1264 1265 /* 1266 * Enable runtime PM for this card 1267 */ 1268 pm_runtime_enable(&card->dev); 1269 } 1270 1271 /* 1272 * The number of functions on the card is encoded inside 1273 * the ocr. 1274 */ 1275 funcs = (ocr & 0x70000000) >> 28; 1276 card->sdio_funcs = 0; 1277 1278 /* 1279 * Initialize (but don't add) all present functions. 1280 */ 1281 for (i = 0; i < funcs; i++, card->sdio_funcs++) { 1282 err = sdio_init_func(host->card, i + 1); 1283 if (err) 1284 goto remove; 1285 1286 /* 1287 * Enable Runtime PM for this func (if supported) 1288 */ 1289 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1290 pm_runtime_enable(&card->sdio_func[i]->dev); 1291 } 1292 1293 /* 1294 * First add the card to the driver model... 1295 */ 1296 mmc_release_host(host); 1297 err = mmc_add_card(host->card); 1298 if (err) 1299 goto remove_added; 1300 1301 /* 1302 * ...then the SDIO functions. 1303 */ 1304 for (i = 0;i < funcs;i++) { 1305 err = sdio_add_func(host->card->sdio_func[i]); 1306 if (err) 1307 goto remove_added; 1308 } 1309 1310 if (host->caps & MMC_CAP_POWER_OFF_CARD) 1311 pm_runtime_put(&card->dev); 1312 1313 mmc_claim_host(host); 1314 return 0; 1315 1316 1317 remove: 1318 mmc_release_host(host); 1319 remove_added: 1320 /* 1321 * The devices are being deleted so it is not necessary to disable 1322 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card 1323 * because it needs to be active to remove any function devices that 1324 * were probed, and after that it gets deleted. 1325 */ 1326 mmc_sdio_remove(host); 1327 mmc_claim_host(host); 1328 err: 1329 mmc_detach_bus(host); 1330 1331 pr_err("%s: error %d whilst initialising SDIO card\n", 1332 mmc_hostname(host), err); 1333 1334 return err; 1335 } 1336 1337