2 * linux/drivers/mmc/sdio.c
4 * Copyright 2006-2007 Pierre Ossman
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
12 #include <linux/err.h>
13 #include <linux/pm_runtime.h>
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
18 #include <linux/mmc/sdio.h>
19 #include <linux/mmc/sdio_func.h>
20 #include <linux/mmc/sdio_ids.h>
31 static int sdio_read_fbr(struct sdio_func *func)
36 if (mmc_card_nonstd_func_interface(func->card)) {
37 func->class = SDIO_CLASS_NONE;
41 ret = mmc_io_rw_direct(func->card, 0, 0,
42 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
49 ret = mmc_io_rw_direct(func->card, 0, 0,
50 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
61 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
64 struct sdio_func *func;
66 BUG_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 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
111 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
115 cccr_vsn = data & 0x0f;
117 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
118 pr_err("%s: unrecognised CCCR structure version %d\n",
119 mmc_hostname(card->host), cccr_vsn);
123 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
125 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
129 if (data & SDIO_CCCR_CAP_SMB)
130 card->cccr.multi_block = 1;
131 if (data & SDIO_CCCR_CAP_LSC)
132 card->cccr.low_speed = 1;
133 if (data & SDIO_CCCR_CAP_4BLS)
134 card->cccr.wide_bus = 1;
136 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
137 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
141 if (data & SDIO_POWER_SMPC)
142 card->cccr.high_power = 1;
145 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
146 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
150 card->scr.sda_spec3 = 0;
151 card->sw_caps.sd3_bus_mode = 0;
152 card->sw_caps.sd3_drv_type = 0;
153 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
154 card->scr.sda_spec3 = 1;
155 ret = mmc_io_rw_direct(card, 0, 0,
156 SDIO_CCCR_UHS, 0, &data);
160 if (mmc_host_uhs(card->host)) {
161 if (data & SDIO_UHS_DDR50)
162 card->sw_caps.sd3_bus_mode
163 |= SD_MODE_UHS_DDR50;
165 if (data & SDIO_UHS_SDR50)
166 card->sw_caps.sd3_bus_mode
167 |= SD_MODE_UHS_SDR50;
169 if (data & SDIO_UHS_SDR104)
170 card->sw_caps.sd3_bus_mode
171 |= SD_MODE_UHS_SDR104;
174 ret = mmc_io_rw_direct(card, 0, 0,
175 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
179 if (data & SDIO_DRIVE_SDTA)
180 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
181 if (data & SDIO_DRIVE_SDTC)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
183 if (data & SDIO_DRIVE_SDTD)
184 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
187 /* if no uhs mode ensure we check for high speed */
188 if (!card->sw_caps.sd3_bus_mode) {
189 if (speed & SDIO_SPEED_SHS) {
190 card->cccr.high_speed = 1;
191 card->sw_caps.hs_max_dtr = 50000000;
193 card->cccr.high_speed = 0;
194 card->sw_caps.hs_max_dtr = 25000000;
203 static int sdio_enable_wide(struct mmc_card *card)
208 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
211 if (card->cccr.low_speed && !card->cccr.wide_bus)
214 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
218 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
219 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
220 mmc_hostname(card->host), ctrl);
222 /* set as 4-bit bus width */
223 ctrl &= ~SDIO_BUS_WIDTH_MASK;
224 ctrl |= SDIO_BUS_WIDTH_4BIT;
226 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
234 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
235 * of the card. This may be required on certain setups of boards,
236 * controllers and embedded sdio device which do not need the card's
237 * pull-up. As a result, card detection is disabled and power is saved.
239 static int sdio_disable_cd(struct mmc_card *card)
244 if (!mmc_card_disable_cd(card))
247 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
251 ctrl |= SDIO_BUS_CD_DISABLE;
253 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
257 * Devices that remain active during a system suspend are
258 * put back into 1-bit mode.
260 static int sdio_disable_wide(struct mmc_card *card)
265 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
268 if (card->cccr.low_speed && !card->cccr.wide_bus)
271 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
275 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
278 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
279 ctrl |= SDIO_BUS_ASYNC_INT;
281 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
291 static int sdio_enable_4bit_bus(struct mmc_card *card)
295 if (card->type == MMC_TYPE_SDIO)
296 err = sdio_enable_wide(card);
297 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
298 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
299 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
302 err = sdio_enable_wide(card);
304 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
309 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
318 * Test if the card supports high-speed mode and, if so, switch to it.
320 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
325 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
328 if (!card->cccr.high_speed)
331 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
336 speed |= SDIO_SPEED_EHS;
338 speed &= ~SDIO_SPEED_EHS;
340 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
348 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
350 static int sdio_enable_hs(struct mmc_card *card)
354 ret = mmc_sdio_switch_hs(card, true);
355 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
358 ret = mmc_sd_switch_hs(card);
360 mmc_sdio_switch_hs(card, false);
365 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
369 if (mmc_card_hs(card)) {
371 * The SDIO specification doesn't mention how
372 * the CIS transfer speed register relates to
373 * high-speed, but it seems that 50 MHz is
378 max_dtr = card->cis.max_dtr;
381 if (card->type == MMC_TYPE_SD_COMBO)
382 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
387 static unsigned char host_drive_to_sdio_drive(int host_strength)
389 switch (host_strength) {
390 case MMC_SET_DRIVER_TYPE_A:
391 return SDIO_DTSx_SET_TYPE_A;
392 case MMC_SET_DRIVER_TYPE_B:
393 return SDIO_DTSx_SET_TYPE_B;
394 case MMC_SET_DRIVER_TYPE_C:
395 return SDIO_DTSx_SET_TYPE_C;
396 case MMC_SET_DRIVER_TYPE_D:
397 return SDIO_DTSx_SET_TYPE_D;
399 return SDIO_DTSx_SET_TYPE_B;
403 static void sdio_select_driver_type(struct mmc_card *card)
405 int host_drv_type = SD_DRIVER_TYPE_B;
406 int card_drv_type = SD_DRIVER_TYPE_B;
408 unsigned char card_strength;
412 * If the host doesn't support any of the Driver Types A,C or D,
413 * or there is no board specific handler then default Driver
416 if (!(card->host->caps &
417 (MMC_CAP_DRIVER_TYPE_A |
418 MMC_CAP_DRIVER_TYPE_C |
419 MMC_CAP_DRIVER_TYPE_D)))
422 if (!card->host->ops->select_drive_strength)
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
426 host_drv_type |= SD_DRIVER_TYPE_A;
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
429 host_drv_type |= SD_DRIVER_TYPE_C;
431 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
432 host_drv_type |= SD_DRIVER_TYPE_D;
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
435 card_drv_type |= SD_DRIVER_TYPE_A;
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
438 card_drv_type |= SD_DRIVER_TYPE_C;
440 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
441 card_drv_type |= SD_DRIVER_TYPE_D;
444 * The drive strength that the hardware can support
445 * depends on the board design. Pass the appropriate
446 * information and let the hardware specific code
447 * return what is possible given the options
449 drive_strength = card->host->ops->select_drive_strength(
450 card->sw_caps.uhs_max_dtr,
451 host_drv_type, card_drv_type);
453 /* if error just use default for drive strength B */
454 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
459 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
460 card_strength |= host_drive_to_sdio_drive(drive_strength);
462 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
463 card_strength, NULL);
465 /* if error default to drive strength B */
467 mmc_set_driver_type(card->host, drive_strength);
471 static int sdio_set_bus_speed_mode(struct mmc_card *card)
473 unsigned int bus_speed, timing;
478 * If the host doesn't support any of the UHS-I modes, fallback on
481 if (!mmc_host_uhs(card->host))
484 bus_speed = SDIO_SPEED_SDR12;
485 timing = MMC_TIMING_UHS_SDR12;
486 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
487 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
488 bus_speed = SDIO_SPEED_SDR104;
489 timing = MMC_TIMING_UHS_SDR104;
490 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
491 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
492 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
494 bus_speed = SDIO_SPEED_DDR50;
495 timing = MMC_TIMING_UHS_DDR50;
496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
498 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
499 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
500 SD_MODE_UHS_SDR50)) {
501 bus_speed = SDIO_SPEED_SDR50;
502 timing = MMC_TIMING_UHS_SDR50;
503 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
504 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
505 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
506 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
507 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
508 bus_speed = SDIO_SPEED_SDR25;
509 timing = MMC_TIMING_UHS_SDR25;
510 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
511 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
512 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
513 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
514 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
515 SD_MODE_UHS_SDR12)) {
516 bus_speed = SDIO_SPEED_SDR12;
517 timing = MMC_TIMING_UHS_SDR12;
518 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
519 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
522 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
526 speed &= ~SDIO_SPEED_BSS_MASK;
528 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
533 mmc_set_timing(card->host, timing);
534 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
541 * UHS-I specific initialization procedure
543 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
547 if (!card->scr.sda_spec3)
551 * Switch to wider bus (if supported).
553 if (card->host->caps & MMC_CAP_4_BIT_DATA)
554 err = sdio_enable_4bit_bus(card);
556 /* Set the driver strength for the card */
557 sdio_select_driver_type(card);
559 /* Set bus speed mode of the card */
560 err = sdio_set_bus_speed_mode(card);
565 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
566 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
568 if (!mmc_host_is_spi(card->host) &&
569 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
570 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)))
571 err = mmc_execute_tuning(card);
577 * Handle the detection and initialisation of a card.
579 * In the case of a resume, "oldcard" will contain the card
580 * we're trying to reinitialise.
582 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
583 struct mmc_card *oldcard, int powered_resume)
585 struct mmc_card *card;
592 WARN_ON(!host->claimed);
594 /* to query card if 1.8V signalling is supported */
595 if (mmc_host_uhs(host))
596 ocr |= R4_18V_PRESENT;
600 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
601 ocr &= ~R4_18V_PRESENT;
605 * Inform the card of the voltage
607 if (!powered_resume) {
608 err = mmc_send_io_op_cond(host, ocr, &rocr);
614 * For SPI, enable CRC as appropriate.
616 if (mmc_host_is_spi(host)) {
617 err = mmc_spi_set_crc(host, use_spi_crc);
623 * Allocate card structure.
625 card = mmc_alloc_card(host, NULL);
631 if ((rocr & R4_MEMORY_PRESENT) &&
632 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
633 card->type = MMC_TYPE_SD_COMBO;
635 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
636 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
637 mmc_remove_card(card);
641 card->type = MMC_TYPE_SDIO;
643 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
644 mmc_remove_card(card);
650 * Call the optional HC's init_card function to handle quirks.
652 if (host->ops->init_card)
653 host->ops->init_card(host, card);
656 * If the host and card support UHS-I mode request the card
657 * to switch to 1.8V signaling level. No 1.8v signalling if
658 * UHS mode is not enabled to maintain compatibility and some
659 * systems that claim 1.8v signalling in fact do not support
662 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
663 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
665 if (err == -EAGAIN) {
668 mmc_send_if_cond(host, host->ocr_avail);
669 mmc_remove_card(card);
673 ocr &= ~R4_18V_PRESENT;
677 ocr &= ~R4_18V_PRESENT;
681 * For native busses: set card RCA and quit open drain mode.
683 if (!powered_resume && !mmc_host_is_spi(host)) {
684 err = mmc_send_relative_addr(host, &card->rca);
689 * Update oldcard with the new RCA received from the SDIO
690 * device -- we're doing this so that it's updated in the
691 * "card" struct when oldcard overwrites that later.
694 oldcard->rca = card->rca;
698 * Read CSD, before selecting the card
700 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
701 err = mmc_sd_get_csd(host, card);
705 mmc_decode_cid(card);
709 * Select card, as all following commands rely on that.
711 if (!powered_resume && !mmc_host_is_spi(host)) {
712 err = mmc_select_card(card);
717 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
719 * This is non-standard SDIO device, meaning it doesn't
720 * have any CIA (Common I/O area) registers present.
721 * It's host's responsibility to fill cccr and cis
722 * structures in init_card().
724 mmc_set_clock(host, card->cis.max_dtr);
726 if (card->cccr.high_speed) {
727 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
734 * Read the common registers.
736 err = sdio_read_cccr(card, ocr);
741 * Read the common CIS tuples.
743 err = sdio_read_common_cis(card);
748 int same = (card->cis.vendor == oldcard->cis.vendor &&
749 card->cis.device == oldcard->cis.device);
750 mmc_remove_card(card);
756 card->ocr = ocr_card;
757 mmc_fixup_device(card, NULL);
759 if (card->type == MMC_TYPE_SD_COMBO) {
760 err = mmc_sd_setup_card(host, card, oldcard != NULL);
761 /* handle as SDIO-only card if memory init failed */
764 if (mmc_host_is_spi(host))
765 /* should not fail, as it worked previously */
766 mmc_spi_set_crc(host, use_spi_crc);
767 card->type = MMC_TYPE_SDIO;
769 card->dev.type = &sd_type;
773 * If needed, disconnect card detection pull-up resistor.
775 err = sdio_disable_cd(card);
779 /* Initialization sequence for UHS-I cards */
780 /* Only if card supports 1.8v and UHS signaling */
781 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
782 err = mmc_sdio_init_uhs_card(card);
787 * Switch to high-speed (if supported).
789 err = sdio_enable_hs(card);
791 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
796 * Change to the card's maximum speed.
798 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
801 * Switch to wider bus (if supported).
803 err = sdio_enable_4bit_bus(card);
814 mmc_remove_card(card);
821 * Host is being removed. Free up the current card.
823 static void mmc_sdio_remove(struct mmc_host *host)
830 for (i = 0;i < host->card->sdio_funcs;i++) {
831 if (host->card->sdio_func[i]) {
832 sdio_remove_func(host->card->sdio_func[i]);
833 host->card->sdio_func[i] = NULL;
837 mmc_remove_card(host->card);
842 * Card detection - card is alive.
844 static int mmc_sdio_alive(struct mmc_host *host)
846 return mmc_select_card(host->card);
850 * Card detection callback from host.
852 static void mmc_sdio_detect(struct mmc_host *host)
859 /* Make sure card is powered before detecting it */
860 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
861 err = pm_runtime_get_sync(&host->card->dev);
863 pm_runtime_put_noidle(&host->card->dev);
868 mmc_claim_host(host);
871 * Just check if our card has been removed.
873 err = _mmc_detect_card_removed(host);
875 mmc_release_host(host);
878 * Tell PM core it's OK to power off the card now.
880 * The _sync variant is used in order to ensure that the card
881 * is left powered off in case an error occurred, and the card
882 * is going to be removed.
884 * Since there is no specific reason to believe a new user
885 * is about to show up at this point, the _sync variant is
888 if (host->caps & MMC_CAP_POWER_OFF_CARD)
889 pm_runtime_put_sync(&host->card->dev);
893 mmc_sdio_remove(host);
895 mmc_claim_host(host);
896 mmc_detach_bus(host);
898 mmc_release_host(host);
903 * SDIO pre_suspend. We need to suspend all functions separately.
904 * Therefore all registered functions must have drivers with suspend
905 * and resume methods. Failing that we simply remove the whole card.
907 static int mmc_sdio_pre_suspend(struct mmc_host *host)
911 for (i = 0; i < host->card->sdio_funcs; i++) {
912 struct sdio_func *func = host->card->sdio_func[i];
913 if (func && sdio_func_present(func) && func->dev.driver) {
914 const struct dev_pm_ops *pmops = func->dev.driver->pm;
915 if (!pmops || !pmops->suspend || !pmops->resume) {
916 /* force removal of entire card in that case */
927 * SDIO suspend. Suspend all functions separately.
929 static int mmc_sdio_suspend(struct mmc_host *host)
931 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
932 mmc_claim_host(host);
933 sdio_disable_wide(host->card);
934 mmc_release_host(host);
937 if (!mmc_card_keep_power(host))
943 static int mmc_sdio_resume(struct mmc_host *host)
950 /* Basic card reinitialization. */
951 mmc_claim_host(host);
953 /* Restore power if needed */
954 if (!mmc_card_keep_power(host)) {
955 mmc_power_up(host, host->card->ocr);
957 * Tell runtime PM core we just powered up the card,
958 * since it still believes the card is powered off.
959 * Note that currently runtime PM is only enabled
960 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
962 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
963 pm_runtime_disable(&host->card->dev);
964 pm_runtime_set_active(&host->card->dev);
965 pm_runtime_enable(&host->card->dev);
969 /* No need to reinitialize powered-resumed nonremovable cards */
970 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
973 mmc_send_if_cond(host, host->card->ocr);
974 err = mmc_send_io_op_cond(host, 0, NULL);
976 err = mmc_sdio_init_card(host, host->card->ocr,
978 mmc_card_keep_power(host));
979 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
980 /* We may have switched to 1-bit mode during suspend */
981 err = sdio_enable_4bit_bus(host->card);
984 if (!err && host->sdio_irqs) {
985 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
986 wake_up_process(host->sdio_irq_thread);
987 } else if (host->caps & MMC_CAP_SDIO_IRQ) {
988 mmc_host_clk_hold(host);
989 host->ops->enable_sdio_irq(host, 1);
990 mmc_host_clk_release(host);
994 mmc_release_host(host);
996 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1000 static int mmc_sdio_power_restore(struct mmc_host *host)
1005 BUG_ON(!host->card);
1007 mmc_claim_host(host);
1010 * Reset the card by performing the same steps that are taken by
1011 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1013 * sdio_reset() is technically not needed. Having just powered up the
1014 * hardware, it should already be in reset state. However, some
1015 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1016 * meaning that a reset is required when restoring power soon after
1017 * powering off. It is harmless in other cases.
1019 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1020 * is not necessary for non-removable cards. However, it is required
1021 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1022 * harmless in other situations.
1028 mmc_send_if_cond(host, host->card->ocr);
1030 ret = mmc_send_io_op_cond(host, 0, NULL);
1034 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1035 mmc_card_keep_power(host));
1036 if (!ret && host->sdio_irqs)
1037 mmc_signal_sdio_irq(host);
1040 mmc_release_host(host);
1045 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1047 /* No references to the card, cut the power to it. */
1048 mmc_power_off(host);
1052 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1054 /* Restore power and re-initialize. */
1055 mmc_power_up(host, host->card->ocr);
1056 return mmc_sdio_power_restore(host);
1059 static const struct mmc_bus_ops mmc_sdio_ops = {
1060 .remove = mmc_sdio_remove,
1061 .detect = mmc_sdio_detect,
1062 .pre_suspend = mmc_sdio_pre_suspend,
1063 .suspend = mmc_sdio_suspend,
1064 .resume = mmc_sdio_resume,
1065 .runtime_suspend = mmc_sdio_runtime_suspend,
1066 .runtime_resume = mmc_sdio_runtime_resume,
1067 .power_restore = mmc_sdio_power_restore,
1068 .alive = mmc_sdio_alive,
1073 * Starting point for SDIO card init.
1075 int mmc_attach_sdio(struct mmc_host *host)
1079 struct mmc_card *card;
1082 WARN_ON(!host->claimed);
1084 err = mmc_send_io_op_cond(host, 0, &ocr);
1088 mmc_attach_bus(host, &mmc_sdio_ops);
1089 if (host->ocr_avail_sdio)
1090 host->ocr_avail = host->ocr_avail_sdio;
1093 rocr = mmc_select_voltage(host, ocr);
1096 * Can we support the voltage(s) of the card(s)?
1104 * Detect and init the card.
1106 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1113 * Enable runtime PM only if supported by host+card+board
1115 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1117 * Let runtime PM core know our card is active
1119 err = pm_runtime_set_active(&card->dev);
1124 * Enable runtime PM for this card
1126 pm_runtime_enable(&card->dev);
1130 * The number of functions on the card is encoded inside
1133 funcs = (ocr & 0x70000000) >> 28;
1134 card->sdio_funcs = 0;
1137 * Initialize (but don't add) all present functions.
1139 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1140 err = sdio_init_func(host->card, i + 1);
1145 * Enable Runtime PM for this func (if supported)
1147 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1148 pm_runtime_enable(&card->sdio_func[i]->dev);
1152 * First add the card to the driver model...
1154 mmc_release_host(host);
1155 err = mmc_add_card(host->card);
1160 * ...then the SDIO functions.
1162 for (i = 0;i < funcs;i++) {
1163 err = sdio_add_func(host->card->sdio_func[i]);
1168 mmc_claim_host(host);
1173 /* Remove without lock if the device has been added. */
1174 mmc_sdio_remove(host);
1175 mmc_claim_host(host);
1177 /* And with lock if it hasn't been added. */
1178 mmc_release_host(host);
1180 mmc_sdio_remove(host);
1181 mmc_claim_host(host);
1183 mmc_detach_bus(host);
1185 pr_err("%s: error %d whilst initialising SDIO card\n",
1186 mmc_hostname(host), err);