1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/drivers/mmc/sdio.c
5 * Copyright 2006-2007 Pierre Ossman
9 #include <linux/pm_runtime.h>
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>
30 static int sdio_read_fbr(struct sdio_func *func)
35 if (mmc_card_nonstd_func_interface(func->card)) {
36 func->class = SDIO_CLASS_NONE;
40 ret = mmc_io_rw_direct(func->card, 0, 0,
41 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
48 ret = mmc_io_rw_direct(func->card, 0, 0,
49 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
60 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
63 struct sdio_func *func;
65 if (WARN_ON(fn > SDIO_MAX_FUNCS))
68 func = sdio_alloc_func(card);
74 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
75 ret = sdio_read_fbr(func);
79 ret = sdio_read_func_cis(func);
83 func->vendor = func->card->cis.vendor;
84 func->device = func->card->cis.device;
85 func->max_blksize = func->card->cis.blksize;
88 card->sdio_func[fn - 1] = func;
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.
97 sdio_remove_func(func);
101 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
105 int uhs = ocr & R4_18V_PRESENT;
109 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
113 cccr_vsn = data & 0x0f;
115 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
116 pr_err("%s: unrecognised CCCR structure version %d\n",
117 mmc_hostname(card->host), cccr_vsn);
121 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
123 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
127 if (data & SDIO_CCCR_CAP_SMB)
128 card->cccr.multi_block = 1;
129 if (data & SDIO_CCCR_CAP_LSC)
130 card->cccr.low_speed = 1;
131 if (data & SDIO_CCCR_CAP_4BLS)
132 card->cccr.wide_bus = 1;
134 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
135 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
139 if (data & SDIO_POWER_SMPC)
140 card->cccr.high_power = 1;
143 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
144 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
148 card->scr.sda_spec3 = 0;
149 card->sw_caps.sd3_bus_mode = 0;
150 card->sw_caps.sd3_drv_type = 0;
151 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
152 card->scr.sda_spec3 = 1;
153 ret = mmc_io_rw_direct(card, 0, 0,
154 SDIO_CCCR_UHS, 0, &data);
158 if (mmc_host_uhs(card->host)) {
159 if (data & SDIO_UHS_DDR50)
160 card->sw_caps.sd3_bus_mode
161 |= SD_MODE_UHS_DDR50;
163 if (data & SDIO_UHS_SDR50)
164 card->sw_caps.sd3_bus_mode
165 |= SD_MODE_UHS_SDR50;
167 if (data & SDIO_UHS_SDR104)
168 card->sw_caps.sd3_bus_mode
169 |= SD_MODE_UHS_SDR104;
172 ret = mmc_io_rw_direct(card, 0, 0,
173 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
177 if (data & SDIO_DRIVE_SDTA)
178 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
179 if (data & SDIO_DRIVE_SDTC)
180 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
181 if (data & SDIO_DRIVE_SDTD)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
185 /* if no uhs mode ensure we check for high speed */
186 if (!card->sw_caps.sd3_bus_mode) {
187 if (speed & SDIO_SPEED_SHS) {
188 card->cccr.high_speed = 1;
189 card->sw_caps.hs_max_dtr = 50000000;
191 card->cccr.high_speed = 0;
192 card->sw_caps.hs_max_dtr = 25000000;
201 static int sdio_enable_wide(struct mmc_card *card)
206 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
209 if (card->cccr.low_speed && !card->cccr.wide_bus)
212 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
216 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
217 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
218 mmc_hostname(card->host), ctrl);
220 /* set as 4-bit bus width */
221 ctrl &= ~SDIO_BUS_WIDTH_MASK;
222 ctrl |= SDIO_BUS_WIDTH_4BIT;
224 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
232 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
233 * of the card. This may be required on certain setups of boards,
234 * controllers and embedded sdio device which do not need the card's
235 * pull-up. As a result, card detection is disabled and power is saved.
237 static int sdio_disable_cd(struct mmc_card *card)
242 if (!mmc_card_disable_cd(card))
245 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
249 ctrl |= SDIO_BUS_CD_DISABLE;
251 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
255 * Devices that remain active during a system suspend are
256 * put back into 1-bit mode.
258 static int sdio_disable_wide(struct mmc_card *card)
263 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
266 if (card->cccr.low_speed && !card->cccr.wide_bus)
269 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
273 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
276 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
277 ctrl |= SDIO_BUS_ASYNC_INT;
279 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
283 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
289 static int sdio_enable_4bit_bus(struct mmc_card *card)
293 if (card->type == MMC_TYPE_SDIO)
294 err = sdio_enable_wide(card);
295 else 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);
300 err = sdio_enable_wide(card);
302 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
307 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
316 * Test if the card supports high-speed mode and, if so, switch to it.
318 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
323 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
326 if (!card->cccr.high_speed)
329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
334 speed |= SDIO_SPEED_EHS;
336 speed &= ~SDIO_SPEED_EHS;
338 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
346 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
348 static int sdio_enable_hs(struct mmc_card *card)
352 ret = mmc_sdio_switch_hs(card, true);
353 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
356 ret = mmc_sd_switch_hs(card);
358 mmc_sdio_switch_hs(card, false);
363 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
367 if (mmc_card_hs(card)) {
369 * The SDIO specification doesn't mention how
370 * the CIS transfer speed register relates to
371 * high-speed, but it seems that 50 MHz is
376 max_dtr = card->cis.max_dtr;
379 if (card->type == MMC_TYPE_SD_COMBO)
380 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
385 static unsigned char host_drive_to_sdio_drive(int host_strength)
387 switch (host_strength) {
388 case MMC_SET_DRIVER_TYPE_A:
389 return SDIO_DTSx_SET_TYPE_A;
390 case MMC_SET_DRIVER_TYPE_B:
391 return SDIO_DTSx_SET_TYPE_B;
392 case MMC_SET_DRIVER_TYPE_C:
393 return SDIO_DTSx_SET_TYPE_C;
394 case MMC_SET_DRIVER_TYPE_D:
395 return SDIO_DTSx_SET_TYPE_D;
397 return SDIO_DTSx_SET_TYPE_B;
401 static void sdio_select_driver_type(struct mmc_card *card)
403 int card_drv_type, drive_strength, drv_type;
404 unsigned char card_strength;
407 card->drive_strength = 0;
409 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
411 drive_strength = mmc_select_drive_strength(card,
412 card->sw_caps.uhs_max_dtr,
413 card_drv_type, &drv_type);
415 if (drive_strength) {
416 /* if error just use default for drive strength B */
417 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
422 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
423 card_strength |= host_drive_to_sdio_drive(drive_strength);
425 /* if error default to drive strength B */
426 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
427 card_strength, NULL);
430 card->drive_strength = drive_strength;
434 mmc_set_driver_type(card->host, drv_type);
438 static int sdio_set_bus_speed_mode(struct mmc_card *card)
440 unsigned int bus_speed, timing;
443 unsigned int max_rate;
446 * If the host doesn't support any of the UHS-I modes, fallback on
449 if (!mmc_host_uhs(card->host))
452 bus_speed = SDIO_SPEED_SDR12;
453 timing = MMC_TIMING_UHS_SDR12;
454 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
455 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
456 bus_speed = SDIO_SPEED_SDR104;
457 timing = MMC_TIMING_UHS_SDR104;
458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
459 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
460 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
461 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
462 bus_speed = SDIO_SPEED_DDR50;
463 timing = MMC_TIMING_UHS_DDR50;
464 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
465 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
468 SD_MODE_UHS_SDR50)) {
469 bus_speed = SDIO_SPEED_SDR50;
470 timing = MMC_TIMING_UHS_SDR50;
471 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 bus_speed = SDIO_SPEED_SDR25;
477 timing = MMC_TIMING_UHS_SDR25;
478 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
479 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
480 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
481 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
483 SD_MODE_UHS_SDR12)) {
484 bus_speed = SDIO_SPEED_SDR12;
485 timing = MMC_TIMING_UHS_SDR12;
486 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
487 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
490 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
494 speed &= ~SDIO_SPEED_BSS_MASK;
496 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
500 max_rate = min_not_zero(card->quirk_max_rate,
501 card->sw_caps.uhs_max_dtr);
504 mmc_set_timing(card->host, timing);
505 mmc_set_clock(card->host, max_rate);
512 * UHS-I specific initialization procedure
514 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
518 if (!card->scr.sda_spec3)
521 /* Switch to wider bus */
522 err = sdio_enable_4bit_bus(card);
526 /* Set the driver strength for the card */
527 sdio_select_driver_type(card);
529 /* Set bus speed mode of the card */
530 err = sdio_set_bus_speed_mode(card);
535 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
536 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
538 if (!mmc_host_is_spi(card->host) &&
539 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
540 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
541 err = mmc_execute_tuning(card);
546 static void mmc_sdio_resend_if_cond(struct mmc_host *host, u32 ocr,
547 struct mmc_card *card)
551 mmc_send_if_cond(host, ocr);
552 mmc_remove_card(card);
556 * Handle the detection and initialisation of a card.
558 * In the case of a resume, "oldcard" will contain the card
559 * we're trying to reinitialise.
561 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
562 struct mmc_card *oldcard)
564 struct mmc_card *card;
570 WARN_ON(!host->claimed);
572 /* to query card if 1.8V signalling is supported */
573 if (mmc_host_uhs(host))
574 ocr |= R4_18V_PRESENT;
578 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
579 ocr &= ~R4_18V_PRESENT;
583 * Inform the card of the voltage
585 err = mmc_send_io_op_cond(host, ocr, &rocr);
590 * For SPI, enable CRC as appropriate.
592 if (mmc_host_is_spi(host)) {
593 err = mmc_spi_set_crc(host, use_spi_crc);
599 * Allocate card structure.
601 card = mmc_alloc_card(host, NULL);
603 return PTR_ERR(card);
605 if ((rocr & R4_MEMORY_PRESENT) &&
606 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
607 card->type = MMC_TYPE_SD_COMBO;
609 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
610 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
615 card->type = MMC_TYPE_SDIO;
617 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
624 * Call the optional HC's init_card function to handle quirks.
626 if (host->ops->init_card)
627 host->ops->init_card(host, card);
630 * If the host and card support UHS-I mode request the card
631 * to switch to 1.8V signaling level. No 1.8v signalling if
632 * UHS mode is not enabled to maintain compatibility and some
633 * systems that claim 1.8v signalling in fact do not support
634 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
635 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
636 * fails to check rocr & R4_18V_PRESENT, but we still need to
637 * try to init uhs card. sdio_read_cccr will take over this task
638 * to make sure which speed mode should work.
640 if (rocr & ocr & R4_18V_PRESENT) {
641 err = mmc_set_uhs_voltage(host, ocr_card);
642 if (err == -EAGAIN) {
643 mmc_sdio_resend_if_cond(host, ocr_card, card);
647 ocr &= ~R4_18V_PRESENT;
652 * For native busses: set card RCA and quit open drain mode.
654 if (!mmc_host_is_spi(host)) {
655 err = mmc_send_relative_addr(host, &card->rca);
660 * Update oldcard with the new RCA received from the SDIO
661 * device -- we're doing this so that it's updated in the
662 * "card" struct when oldcard overwrites that later.
665 oldcard->rca = card->rca;
669 * Read CSD, before selecting the card
671 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
672 err = mmc_sd_get_csd(host, card);
676 mmc_decode_cid(card);
680 * Select card, as all following commands rely on that.
682 if (!mmc_host_is_spi(host)) {
683 err = mmc_select_card(card);
688 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
690 * This is non-standard SDIO device, meaning it doesn't
691 * have any CIA (Common I/O area) registers present.
692 * It's host's responsibility to fill cccr and cis
693 * structures in init_card().
695 mmc_set_clock(host, card->cis.max_dtr);
697 if (card->cccr.high_speed) {
698 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
702 mmc_remove_card(card);
710 * Read the common registers. Note that we should try to
711 * validate whether UHS would work or not.
713 err = sdio_read_cccr(card, ocr);
715 mmc_sdio_resend_if_cond(host, ocr_card, card);
716 if (ocr & R4_18V_PRESENT) {
717 /* Retry init sequence, but without R4_18V_PRESENT. */
725 * Read the common CIS tuples.
727 err = sdio_read_common_cis(card);
732 if (card->cis.vendor == oldcard->cis.vendor &&
733 card->cis.device == oldcard->cis.device) {
734 mmc_remove_card(card);
741 card->ocr = ocr_card;
742 mmc_fixup_device(card, sdio_fixup_methods);
744 if (card->type == MMC_TYPE_SD_COMBO) {
745 err = mmc_sd_setup_card(host, card, oldcard != NULL);
746 /* handle as SDIO-only card if memory init failed */
749 if (mmc_host_is_spi(host))
750 /* should not fail, as it worked previously */
751 mmc_spi_set_crc(host, use_spi_crc);
752 card->type = MMC_TYPE_SDIO;
754 card->dev.type = &sd_type;
758 * If needed, disconnect card detection pull-up resistor.
760 err = sdio_disable_cd(card);
764 /* Initialization sequence for UHS-I cards */
765 /* Only if card supports 1.8v and UHS signaling */
766 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
767 err = mmc_sdio_init_uhs_card(card);
772 * Switch to high-speed (if supported).
774 err = sdio_enable_hs(card);
776 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
781 * Change to the card's maximum speed.
783 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
786 * Switch to wider bus (if supported).
788 err = sdio_enable_4bit_bus(card);
793 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
794 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
795 pr_err("%s: Host failed to negotiate down from 3.3V\n",
805 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
808 mmc_remove_card(card);
812 static int mmc_sdio_reinit_card(struct mmc_host *host)
817 * Reset the card by performing the same steps that are taken by
818 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
820 * sdio_reset() is technically not needed. Having just powered up the
821 * hardware, it should already be in reset state. However, some
822 * platforms (such as SD8686 on OLPC) do not instantly cut power,
823 * meaning that a reset is required when restoring power soon after
824 * powering off. It is harmless in other cases.
826 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
827 * is not necessary for non-removable cards. However, it is required
828 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
829 * harmless in other situations.
835 mmc_send_if_cond(host, host->card->ocr);
837 ret = mmc_send_io_op_cond(host, 0, NULL);
841 return mmc_sdio_init_card(host, host->card->ocr, host->card);
845 * Host is being removed. Free up the current card.
847 static void mmc_sdio_remove(struct mmc_host *host)
851 for (i = 0;i < host->card->sdio_funcs;i++) {
852 if (host->card->sdio_func[i]) {
853 sdio_remove_func(host->card->sdio_func[i]);
854 host->card->sdio_func[i] = NULL;
858 mmc_remove_card(host->card);
863 * Card detection - card is alive.
865 static int mmc_sdio_alive(struct mmc_host *host)
867 return mmc_select_card(host->card);
871 * Card detection callback from host.
873 static void mmc_sdio_detect(struct mmc_host *host)
877 /* Make sure card is powered before detecting it */
878 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
879 err = pm_runtime_get_sync(&host->card->dev);
881 pm_runtime_put_noidle(&host->card->dev);
886 mmc_claim_host(host);
889 * Just check if our card has been removed.
891 err = _mmc_detect_card_removed(host);
893 mmc_release_host(host);
896 * Tell PM core it's OK to power off the card now.
898 * The _sync variant is used in order to ensure that the card
899 * is left powered off in case an error occurred, and the card
900 * is going to be removed.
902 * Since there is no specific reason to believe a new user
903 * is about to show up at this point, the _sync variant is
906 if (host->caps & MMC_CAP_POWER_OFF_CARD)
907 pm_runtime_put_sync(&host->card->dev);
911 mmc_sdio_remove(host);
913 mmc_claim_host(host);
914 mmc_detach_bus(host);
916 mmc_release_host(host);
921 * SDIO pre_suspend. We need to suspend all functions separately.
922 * Therefore all registered functions must have drivers with suspend
923 * and resume methods. Failing that we simply remove the whole card.
925 static int mmc_sdio_pre_suspend(struct mmc_host *host)
929 for (i = 0; i < host->card->sdio_funcs; i++) {
930 struct sdio_func *func = host->card->sdio_func[i];
931 if (func && sdio_func_present(func) && func->dev.driver) {
932 const struct dev_pm_ops *pmops = func->dev.driver->pm;
933 if (!pmops || !pmops->suspend || !pmops->resume) {
934 /* force removal of entire card in that case */
945 * SDIO suspend. Suspend all functions separately.
947 static int mmc_sdio_suspend(struct mmc_host *host)
949 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
951 /* Prevent processing of SDIO IRQs in suspended state. */
952 mmc_card_set_suspended(host->card);
953 cancel_delayed_work_sync(&host->sdio_irq_work);
955 mmc_claim_host(host);
957 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
958 sdio_disable_wide(host->card);
960 if (!mmc_card_keep_power(host)) {
962 } else if (host->retune_period) {
963 mmc_retune_timer_stop(host);
964 mmc_retune_needed(host);
967 mmc_release_host(host);
972 static int mmc_sdio_resume(struct mmc_host *host)
976 /* Basic card reinitialization. */
977 mmc_claim_host(host);
980 * Restore power and reinitialize the card when needed. Note that a
981 * removable card is checked from a detect work later on in the resume
984 if (!mmc_card_keep_power(host)) {
985 mmc_power_up(host, host->card->ocr);
987 * Tell runtime PM core we just powered up the card,
988 * since it still believes the card is powered off.
989 * Note that currently runtime PM is only enabled
990 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
992 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
993 pm_runtime_disable(&host->card->dev);
994 pm_runtime_set_active(&host->card->dev);
995 pm_runtime_enable(&host->card->dev);
997 err = mmc_sdio_reinit_card(host);
998 } else if (mmc_card_wake_sdio_irq(host)) {
999 /* We may have switched to 1-bit mode during suspend */
1000 err = sdio_enable_4bit_bus(host->card);
1006 /* Allow SDIO IRQs to be processed again. */
1007 mmc_card_clr_suspended(host->card);
1009 if (host->sdio_irqs) {
1010 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1011 wake_up_process(host->sdio_irq_thread);
1012 else if (host->caps & MMC_CAP_SDIO_IRQ)
1013 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1017 mmc_release_host(host);
1019 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1023 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1025 /* No references to the card, cut the power to it. */
1026 mmc_claim_host(host);
1027 mmc_power_off(host);
1028 mmc_release_host(host);
1033 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1037 /* Restore power and re-initialize. */
1038 mmc_claim_host(host);
1039 mmc_power_up(host, host->card->ocr);
1040 ret = mmc_sdio_reinit_card(host);
1041 mmc_release_host(host);
1049 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1050 * reset was asynchronously scheduled, else a negative error code.
1052 static int mmc_sdio_hw_reset(struct mmc_host *host)
1054 struct mmc_card *card = host->card;
1057 * In case the card is shared among multiple func drivers, reset the
1058 * card through a rescan work. In this way it will be removed and
1059 * re-detected, thus all func drivers becomes informed about it.
1061 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1062 if (mmc_card_removed(card))
1064 host->rescan_entered = 0;
1065 mmc_card_set_removed(card);
1066 _mmc_detect_change(host, 0, false);
1071 * A single func driver has been probed, then let's skip the heavy
1072 * hotplug dance above and execute the reset immediately.
1074 mmc_power_cycle(host, card->ocr);
1075 return mmc_sdio_reinit_card(host);
1078 static int mmc_sdio_sw_reset(struct mmc_host *host)
1080 mmc_set_clock(host, host->f_init);
1084 mmc_set_initial_state(host);
1085 mmc_set_initial_signal_voltage(host);
1087 return mmc_sdio_reinit_card(host);
1090 static const struct mmc_bus_ops mmc_sdio_ops = {
1091 .remove = mmc_sdio_remove,
1092 .detect = mmc_sdio_detect,
1093 .pre_suspend = mmc_sdio_pre_suspend,
1094 .suspend = mmc_sdio_suspend,
1095 .resume = mmc_sdio_resume,
1096 .runtime_suspend = mmc_sdio_runtime_suspend,
1097 .runtime_resume = mmc_sdio_runtime_resume,
1098 .alive = mmc_sdio_alive,
1099 .hw_reset = mmc_sdio_hw_reset,
1100 .sw_reset = mmc_sdio_sw_reset,
1105 * Starting point for SDIO card init.
1107 int mmc_attach_sdio(struct mmc_host *host)
1111 struct mmc_card *card;
1113 WARN_ON(!host->claimed);
1115 err = mmc_send_io_op_cond(host, 0, &ocr);
1119 mmc_attach_bus(host, &mmc_sdio_ops);
1120 if (host->ocr_avail_sdio)
1121 host->ocr_avail = host->ocr_avail_sdio;
1124 rocr = mmc_select_voltage(host, ocr);
1127 * Can we support the voltage(s) of the card(s)?
1135 * Detect and init the card.
1137 err = mmc_sdio_init_card(host, rocr, NULL);
1144 * Enable runtime PM only if supported by host+card+board
1146 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1148 * Do not allow runtime suspend until after SDIO function
1149 * devices are added.
1151 pm_runtime_get_noresume(&card->dev);
1154 * Let runtime PM core know our card is active
1156 err = pm_runtime_set_active(&card->dev);
1161 * Enable runtime PM for this card
1163 pm_runtime_enable(&card->dev);
1167 * The number of functions on the card is encoded inside
1170 funcs = (ocr & 0x70000000) >> 28;
1171 card->sdio_funcs = 0;
1174 * Initialize (but don't add) all present functions.
1176 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1177 err = sdio_init_func(host->card, i + 1);
1182 * Enable Runtime PM for this func (if supported)
1184 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1185 pm_runtime_enable(&card->sdio_func[i]->dev);
1189 * First add the card to the driver model...
1191 mmc_release_host(host);
1192 err = mmc_add_card(host->card);
1197 * ...then the SDIO functions.
1199 for (i = 0;i < funcs;i++) {
1200 err = sdio_add_func(host->card->sdio_func[i]);
1205 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1206 pm_runtime_put(&card->dev);
1208 mmc_claim_host(host);
1213 mmc_release_host(host);
1216 * The devices are being deleted so it is not necessary to disable
1217 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1218 * because it needs to be active to remove any function devices that
1219 * were probed, and after that it gets deleted.
1221 mmc_sdio_remove(host);
1222 mmc_claim_host(host);
1224 mmc_detach_bus(host);
1226 pr_err("%s: error %d whilst initialising SDIO card\n",
1227 mmc_hostname(host), err);