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 card_drv_type, drive_strength, drv_type;
406 unsigned char card_strength;
409 card->drive_strength = 0;
411 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
413 drive_strength = mmc_select_drive_strength(card,
414 card->sw_caps.uhs_max_dtr,
415 card_drv_type, &drv_type);
417 if (drive_strength) {
418 /* if error just use default for drive strength B */
419 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
424 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
425 card_strength |= host_drive_to_sdio_drive(drive_strength);
427 /* if error default to drive strength B */
428 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
429 card_strength, NULL);
432 card->drive_strength = drive_strength;
436 mmc_set_driver_type(card->host, drv_type);
440 static int sdio_set_bus_speed_mode(struct mmc_card *card)
442 unsigned int bus_speed, timing;
447 * If the host doesn't support any of the UHS-I modes, fallback on
450 if (!mmc_host_uhs(card->host))
453 bus_speed = SDIO_SPEED_SDR12;
454 timing = MMC_TIMING_UHS_SDR12;
455 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
456 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
457 bus_speed = SDIO_SPEED_SDR104;
458 timing = MMC_TIMING_UHS_SDR104;
459 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
460 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
461 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
462 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
463 bus_speed = SDIO_SPEED_DDR50;
464 timing = MMC_TIMING_UHS_DDR50;
465 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
466 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
467 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
468 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
469 SD_MODE_UHS_SDR50)) {
470 bus_speed = SDIO_SPEED_SDR50;
471 timing = MMC_TIMING_UHS_SDR50;
472 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
473 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
474 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
475 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
477 bus_speed = SDIO_SPEED_SDR25;
478 timing = MMC_TIMING_UHS_SDR25;
479 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
480 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
481 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
483 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
484 SD_MODE_UHS_SDR12)) {
485 bus_speed = SDIO_SPEED_SDR12;
486 timing = MMC_TIMING_UHS_SDR12;
487 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
488 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
491 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
495 speed &= ~SDIO_SPEED_BSS_MASK;
497 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
502 mmc_set_timing(card->host, timing);
503 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
510 * UHS-I specific initialization procedure
512 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
516 if (!card->scr.sda_spec3)
520 * Switch to wider bus (if supported).
522 if (card->host->caps & MMC_CAP_4_BIT_DATA)
523 err = sdio_enable_4bit_bus(card);
525 /* Set the driver strength for the card */
526 sdio_select_driver_type(card);
528 /* Set bus speed mode of the card */
529 err = sdio_set_bus_speed_mode(card);
534 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
535 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
537 if (!mmc_host_is_spi(card->host) &&
538 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
539 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)))
540 err = mmc_execute_tuning(card);
546 * Handle the detection and initialisation of a card.
548 * In the case of a resume, "oldcard" will contain the card
549 * we're trying to reinitialise.
551 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
552 struct mmc_card *oldcard, int powered_resume)
554 struct mmc_card *card;
561 WARN_ON(!host->claimed);
563 /* to query card if 1.8V signalling is supported */
564 if (mmc_host_uhs(host))
565 ocr |= R4_18V_PRESENT;
569 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
570 ocr &= ~R4_18V_PRESENT;
574 * Inform the card of the voltage
576 if (!powered_resume) {
577 err = mmc_send_io_op_cond(host, ocr, &rocr);
583 * For SPI, enable CRC as appropriate.
585 if (mmc_host_is_spi(host)) {
586 err = mmc_spi_set_crc(host, use_spi_crc);
592 * Allocate card structure.
594 card = mmc_alloc_card(host, NULL);
600 if ((rocr & R4_MEMORY_PRESENT) &&
601 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
602 card->type = MMC_TYPE_SD_COMBO;
604 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
605 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
606 mmc_remove_card(card);
610 card->type = MMC_TYPE_SDIO;
612 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
613 mmc_remove_card(card);
619 * Call the optional HC's init_card function to handle quirks.
621 if (host->ops->init_card)
622 host->ops->init_card(host, card);
625 * If the host and card support UHS-I mode request the card
626 * to switch to 1.8V signaling level. No 1.8v signalling if
627 * UHS mode is not enabled to maintain compatibility and some
628 * systems that claim 1.8v signalling in fact do not support
631 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
632 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
634 if (err == -EAGAIN) {
637 mmc_send_if_cond(host, host->ocr_avail);
638 mmc_remove_card(card);
642 ocr &= ~R4_18V_PRESENT;
646 ocr &= ~R4_18V_PRESENT;
650 * For native busses: set card RCA and quit open drain mode.
652 if (!powered_resume && !mmc_host_is_spi(host)) {
653 err = mmc_send_relative_addr(host, &card->rca);
658 * Update oldcard with the new RCA received from the SDIO
659 * device -- we're doing this so that it's updated in the
660 * "card" struct when oldcard overwrites that later.
663 oldcard->rca = card->rca;
667 * Read CSD, before selecting the card
669 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
670 err = mmc_sd_get_csd(host, card);
674 mmc_decode_cid(card);
678 * Select card, as all following commands rely on that.
680 if (!powered_resume && !mmc_host_is_spi(host)) {
681 err = mmc_select_card(card);
686 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
688 * This is non-standard SDIO device, meaning it doesn't
689 * have any CIA (Common I/O area) registers present.
690 * It's host's responsibility to fill cccr and cis
691 * structures in init_card().
693 mmc_set_clock(host, card->cis.max_dtr);
695 if (card->cccr.high_speed) {
696 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
703 * Read the common registers.
705 err = sdio_read_cccr(card, ocr);
710 * Read the common CIS tuples.
712 err = sdio_read_common_cis(card);
717 int same = (card->cis.vendor == oldcard->cis.vendor &&
718 card->cis.device == oldcard->cis.device);
719 mmc_remove_card(card);
725 card->ocr = ocr_card;
726 mmc_fixup_device(card, NULL);
728 if (card->type == MMC_TYPE_SD_COMBO) {
729 err = mmc_sd_setup_card(host, card, oldcard != NULL);
730 /* handle as SDIO-only card if memory init failed */
733 if (mmc_host_is_spi(host))
734 /* should not fail, as it worked previously */
735 mmc_spi_set_crc(host, use_spi_crc);
736 card->type = MMC_TYPE_SDIO;
738 card->dev.type = &sd_type;
742 * If needed, disconnect card detection pull-up resistor.
744 err = sdio_disable_cd(card);
748 /* Initialization sequence for UHS-I cards */
749 /* Only if card supports 1.8v and UHS signaling */
750 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
751 err = mmc_sdio_init_uhs_card(card);
756 * Switch to high-speed (if supported).
758 err = sdio_enable_hs(card);
760 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
765 * Change to the card's maximum speed.
767 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
770 * Switch to wider bus (if supported).
772 err = sdio_enable_4bit_bus(card);
783 mmc_remove_card(card);
790 * Host is being removed. Free up the current card.
792 static void mmc_sdio_remove(struct mmc_host *host)
799 for (i = 0;i < host->card->sdio_funcs;i++) {
800 if (host->card->sdio_func[i]) {
801 sdio_remove_func(host->card->sdio_func[i]);
802 host->card->sdio_func[i] = NULL;
806 mmc_remove_card(host->card);
811 * Card detection - card is alive.
813 static int mmc_sdio_alive(struct mmc_host *host)
815 return mmc_select_card(host->card);
819 * Card detection callback from host.
821 static void mmc_sdio_detect(struct mmc_host *host)
828 /* Make sure card is powered before detecting it */
829 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
830 err = pm_runtime_get_sync(&host->card->dev);
832 pm_runtime_put_noidle(&host->card->dev);
837 mmc_claim_host(host);
840 * Just check if our card has been removed.
842 err = _mmc_detect_card_removed(host);
844 mmc_release_host(host);
847 * Tell PM core it's OK to power off the card now.
849 * The _sync variant is used in order to ensure that the card
850 * is left powered off in case an error occurred, and the card
851 * is going to be removed.
853 * Since there is no specific reason to believe a new user
854 * is about to show up at this point, the _sync variant is
857 if (host->caps & MMC_CAP_POWER_OFF_CARD)
858 pm_runtime_put_sync(&host->card->dev);
862 mmc_sdio_remove(host);
864 mmc_claim_host(host);
865 mmc_detach_bus(host);
867 mmc_release_host(host);
872 * SDIO pre_suspend. We need to suspend all functions separately.
873 * Therefore all registered functions must have drivers with suspend
874 * and resume methods. Failing that we simply remove the whole card.
876 static int mmc_sdio_pre_suspend(struct mmc_host *host)
880 for (i = 0; i < host->card->sdio_funcs; i++) {
881 struct sdio_func *func = host->card->sdio_func[i];
882 if (func && sdio_func_present(func) && func->dev.driver) {
883 const struct dev_pm_ops *pmops = func->dev.driver->pm;
884 if (!pmops || !pmops->suspend || !pmops->resume) {
885 /* force removal of entire card in that case */
896 * SDIO suspend. Suspend all functions separately.
898 static int mmc_sdio_suspend(struct mmc_host *host)
900 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
901 mmc_claim_host(host);
902 sdio_disable_wide(host->card);
903 mmc_release_host(host);
906 if (!mmc_card_keep_power(host)) {
908 } else if (host->retune_period) {
909 mmc_retune_timer_stop(host);
910 mmc_retune_needed(host);
916 static int mmc_sdio_resume(struct mmc_host *host)
923 /* Basic card reinitialization. */
924 mmc_claim_host(host);
926 /* Restore power if needed */
927 if (!mmc_card_keep_power(host)) {
928 mmc_power_up(host, host->card->ocr);
930 * Tell runtime PM core we just powered up the card,
931 * since it still believes the card is powered off.
932 * Note that currently runtime PM is only enabled
933 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
935 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
936 pm_runtime_disable(&host->card->dev);
937 pm_runtime_set_active(&host->card->dev);
938 pm_runtime_enable(&host->card->dev);
942 /* No need to reinitialize powered-resumed nonremovable cards */
943 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
946 mmc_send_if_cond(host, host->card->ocr);
947 err = mmc_send_io_op_cond(host, 0, NULL);
949 err = mmc_sdio_init_card(host, host->card->ocr,
951 mmc_card_keep_power(host));
952 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
953 /* We may have switched to 1-bit mode during suspend */
954 err = sdio_enable_4bit_bus(host->card);
957 if (!err && host->sdio_irqs) {
958 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
959 wake_up_process(host->sdio_irq_thread);
960 } else if (host->caps & MMC_CAP_SDIO_IRQ) {
961 mmc_host_clk_hold(host);
962 host->ops->enable_sdio_irq(host, 1);
963 mmc_host_clk_release(host);
967 mmc_release_host(host);
969 host->pm_flags &= ~MMC_PM_KEEP_POWER;
973 static int mmc_sdio_power_restore(struct mmc_host *host)
980 mmc_claim_host(host);
983 * Reset the card by performing the same steps that are taken by
984 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
986 * sdio_reset() is technically not needed. Having just powered up the
987 * hardware, it should already be in reset state. However, some
988 * platforms (such as SD8686 on OLPC) do not instantly cut power,
989 * meaning that a reset is required when restoring power soon after
990 * powering off. It is harmless in other cases.
992 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
993 * is not necessary for non-removable cards. However, it is required
994 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
995 * harmless in other situations.
1001 mmc_send_if_cond(host, host->card->ocr);
1003 ret = mmc_send_io_op_cond(host, 0, NULL);
1007 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1008 mmc_card_keep_power(host));
1009 if (!ret && host->sdio_irqs)
1010 mmc_signal_sdio_irq(host);
1013 mmc_release_host(host);
1018 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1020 /* No references to the card, cut the power to it. */
1021 mmc_power_off(host);
1025 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1027 /* Restore power and re-initialize. */
1028 mmc_power_up(host, host->card->ocr);
1029 return mmc_sdio_power_restore(host);
1032 static int mmc_sdio_reset(struct mmc_host *host)
1034 mmc_power_cycle(host, host->card->ocr);
1035 return mmc_sdio_power_restore(host);
1038 static const struct mmc_bus_ops mmc_sdio_ops = {
1039 .remove = mmc_sdio_remove,
1040 .detect = mmc_sdio_detect,
1041 .pre_suspend = mmc_sdio_pre_suspend,
1042 .suspend = mmc_sdio_suspend,
1043 .resume = mmc_sdio_resume,
1044 .runtime_suspend = mmc_sdio_runtime_suspend,
1045 .runtime_resume = mmc_sdio_runtime_resume,
1046 .power_restore = mmc_sdio_power_restore,
1047 .alive = mmc_sdio_alive,
1048 .reset = mmc_sdio_reset,
1053 * Starting point for SDIO card init.
1055 int mmc_attach_sdio(struct mmc_host *host)
1059 struct mmc_card *card;
1062 WARN_ON(!host->claimed);
1064 err = mmc_send_io_op_cond(host, 0, &ocr);
1068 mmc_attach_bus(host, &mmc_sdio_ops);
1069 if (host->ocr_avail_sdio)
1070 host->ocr_avail = host->ocr_avail_sdio;
1073 rocr = mmc_select_voltage(host, ocr);
1076 * Can we support the voltage(s) of the card(s)?
1084 * Detect and init the card.
1086 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1093 * Enable runtime PM only if supported by host+card+board
1095 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1097 * Let runtime PM core know our card is active
1099 err = pm_runtime_set_active(&card->dev);
1104 * Enable runtime PM for this card
1106 pm_runtime_enable(&card->dev);
1110 * The number of functions on the card is encoded inside
1113 funcs = (ocr & 0x70000000) >> 28;
1114 card->sdio_funcs = 0;
1117 * Initialize (but don't add) all present functions.
1119 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1120 err = sdio_init_func(host->card, i + 1);
1125 * Enable Runtime PM for this func (if supported)
1127 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1128 pm_runtime_enable(&card->sdio_func[i]->dev);
1132 * First add the card to the driver model...
1134 mmc_release_host(host);
1135 err = mmc_add_card(host->card);
1140 * ...then the SDIO functions.
1142 for (i = 0;i < funcs;i++) {
1143 err = sdio_add_func(host->card->sdio_func[i]);
1148 mmc_claim_host(host);
1153 /* Remove without lock if the device has been added. */
1154 mmc_sdio_remove(host);
1155 mmc_claim_host(host);
1157 /* And with lock if it hasn't been added. */
1158 mmc_release_host(host);
1160 mmc_sdio_remove(host);
1161 mmc_claim_host(host);
1163 mmc_detach_bus(host);
1165 pr_err("%s: error %d whilst initialising SDIO card\n",
1166 mmc_hostname(host), err);