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 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;
445 * If the host doesn't support any of the UHS-I modes, fallback on
448 if (!mmc_host_uhs(card->host))
451 bus_speed = SDIO_SPEED_SDR12;
452 timing = MMC_TIMING_UHS_SDR12;
453 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
454 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
455 bus_speed = SDIO_SPEED_SDR104;
456 timing = MMC_TIMING_UHS_SDR104;
457 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
458 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
459 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
460 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
461 bus_speed = SDIO_SPEED_DDR50;
462 timing = MMC_TIMING_UHS_DDR50;
463 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
464 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
465 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
466 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
467 SD_MODE_UHS_SDR50)) {
468 bus_speed = SDIO_SPEED_SDR50;
469 timing = MMC_TIMING_UHS_SDR50;
470 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
471 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
472 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
473 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
475 bus_speed = SDIO_SPEED_SDR25;
476 timing = MMC_TIMING_UHS_SDR25;
477 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
478 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
479 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
480 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
481 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
482 SD_MODE_UHS_SDR12)) {
483 bus_speed = SDIO_SPEED_SDR12;
484 timing = MMC_TIMING_UHS_SDR12;
485 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
486 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
489 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
493 speed &= ~SDIO_SPEED_BSS_MASK;
495 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
500 mmc_set_timing(card->host, timing);
501 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
508 * UHS-I specific initialization procedure
510 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
514 if (!card->scr.sda_spec3)
518 * Switch to wider bus (if supported).
520 if (card->host->caps & MMC_CAP_4_BIT_DATA)
521 err = sdio_enable_4bit_bus(card);
523 /* Set the driver strength for the card */
524 sdio_select_driver_type(card);
526 /* Set bus speed mode of the card */
527 err = sdio_set_bus_speed_mode(card);
532 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
533 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
535 if (!mmc_host_is_spi(card->host) &&
536 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
537 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
538 err = mmc_execute_tuning(card);
544 * Handle the detection and initialisation of a card.
546 * In the case of a resume, "oldcard" will contain the card
547 * we're trying to reinitialise.
549 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
550 struct mmc_card *oldcard, int powered_resume)
552 struct mmc_card *card;
559 WARN_ON(!host->claimed);
561 /* to query card if 1.8V signalling is supported */
562 if (mmc_host_uhs(host))
563 ocr |= R4_18V_PRESENT;
567 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
568 ocr &= ~R4_18V_PRESENT;
572 * Inform the card of the voltage
574 if (!powered_resume) {
575 err = mmc_send_io_op_cond(host, ocr, &rocr);
581 * For SPI, enable CRC as appropriate.
583 if (mmc_host_is_spi(host)) {
584 err = mmc_spi_set_crc(host, use_spi_crc);
590 * Allocate card structure.
592 card = mmc_alloc_card(host, NULL);
598 if ((rocr & R4_MEMORY_PRESENT) &&
599 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
600 card->type = MMC_TYPE_SD_COMBO;
602 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
603 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
604 mmc_remove_card(card);
608 card->type = MMC_TYPE_SDIO;
610 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
611 mmc_remove_card(card);
617 * Call the optional HC's init_card function to handle quirks.
619 if (host->ops->init_card)
620 host->ops->init_card(host, card);
623 * If the host and card support UHS-I mode request the card
624 * to switch to 1.8V signaling level. No 1.8v signalling if
625 * UHS mode is not enabled to maintain compatibility and some
626 * systems that claim 1.8v signalling in fact do not support
629 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
630 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
632 if (err == -EAGAIN) {
635 mmc_send_if_cond(host, host->ocr_avail);
636 mmc_remove_card(card);
640 ocr &= ~R4_18V_PRESENT;
644 ocr &= ~R4_18V_PRESENT;
648 * For native busses: set card RCA and quit open drain mode.
650 if (!powered_resume && !mmc_host_is_spi(host)) {
651 err = mmc_send_relative_addr(host, &card->rca);
656 * Update oldcard with the new RCA received from the SDIO
657 * device -- we're doing this so that it's updated in the
658 * "card" struct when oldcard overwrites that later.
661 oldcard->rca = card->rca;
665 * Read CSD, before selecting the card
667 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
668 err = mmc_sd_get_csd(host, card);
672 mmc_decode_cid(card);
676 * Select card, as all following commands rely on that.
678 if (!powered_resume && !mmc_host_is_spi(host)) {
679 err = mmc_select_card(card);
684 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
686 * This is non-standard SDIO device, meaning it doesn't
687 * have any CIA (Common I/O area) registers present.
688 * It's host's responsibility to fill cccr and cis
689 * structures in init_card().
691 mmc_set_clock(host, card->cis.max_dtr);
693 if (card->cccr.high_speed) {
694 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
701 * Read the common registers.
703 err = sdio_read_cccr(card, ocr);
708 * Read the common CIS tuples.
710 err = sdio_read_common_cis(card);
715 int same = (card->cis.vendor == oldcard->cis.vendor &&
716 card->cis.device == oldcard->cis.device);
717 mmc_remove_card(card);
723 card->ocr = ocr_card;
724 mmc_fixup_device(card, NULL);
726 if (card->type == MMC_TYPE_SD_COMBO) {
727 err = mmc_sd_setup_card(host, card, oldcard != NULL);
728 /* handle as SDIO-only card if memory init failed */
731 if (mmc_host_is_spi(host))
732 /* should not fail, as it worked previously */
733 mmc_spi_set_crc(host, use_spi_crc);
734 card->type = MMC_TYPE_SDIO;
736 card->dev.type = &sd_type;
740 * If needed, disconnect card detection pull-up resistor.
742 err = sdio_disable_cd(card);
746 /* Initialization sequence for UHS-I cards */
747 /* Only if card supports 1.8v and UHS signaling */
748 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
749 err = mmc_sdio_init_uhs_card(card);
754 * Switch to high-speed (if supported).
756 err = sdio_enable_hs(card);
758 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
763 * Change to the card's maximum speed.
765 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
768 * Switch to wider bus (if supported).
770 err = sdio_enable_4bit_bus(card);
781 mmc_remove_card(card);
788 * Host is being removed. Free up the current card.
790 static void mmc_sdio_remove(struct mmc_host *host)
797 for (i = 0;i < host->card->sdio_funcs;i++) {
798 if (host->card->sdio_func[i]) {
799 sdio_remove_func(host->card->sdio_func[i]);
800 host->card->sdio_func[i] = NULL;
804 mmc_remove_card(host->card);
809 * Card detection - card is alive.
811 static int mmc_sdio_alive(struct mmc_host *host)
813 return mmc_select_card(host->card);
817 * Card detection callback from host.
819 static void mmc_sdio_detect(struct mmc_host *host)
826 /* Make sure card is powered before detecting it */
827 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
828 err = pm_runtime_get_sync(&host->card->dev);
830 pm_runtime_put_noidle(&host->card->dev);
835 mmc_claim_host(host);
838 * Just check if our card has been removed.
840 err = _mmc_detect_card_removed(host);
842 mmc_release_host(host);
845 * Tell PM core it's OK to power off the card now.
847 * The _sync variant is used in order to ensure that the card
848 * is left powered off in case an error occurred, and the card
849 * is going to be removed.
851 * Since there is no specific reason to believe a new user
852 * is about to show up at this point, the _sync variant is
855 if (host->caps & MMC_CAP_POWER_OFF_CARD)
856 pm_runtime_put_sync(&host->card->dev);
860 mmc_sdio_remove(host);
862 mmc_claim_host(host);
863 mmc_detach_bus(host);
865 mmc_release_host(host);
870 * SDIO pre_suspend. We need to suspend all functions separately.
871 * Therefore all registered functions must have drivers with suspend
872 * and resume methods. Failing that we simply remove the whole card.
874 static int mmc_sdio_pre_suspend(struct mmc_host *host)
878 for (i = 0; i < host->card->sdio_funcs; i++) {
879 struct sdio_func *func = host->card->sdio_func[i];
880 if (func && sdio_func_present(func) && func->dev.driver) {
881 const struct dev_pm_ops *pmops = func->dev.driver->pm;
882 if (!pmops || !pmops->suspend || !pmops->resume) {
883 /* force removal of entire card in that case */
894 * SDIO suspend. Suspend all functions separately.
896 static int mmc_sdio_suspend(struct mmc_host *host)
898 mmc_claim_host(host);
900 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
901 sdio_disable_wide(host->card);
903 if (!mmc_card_keep_power(host)) {
905 } else if (host->retune_period) {
906 mmc_retune_timer_stop(host);
907 mmc_retune_needed(host);
910 mmc_release_host(host);
915 static int mmc_sdio_resume(struct mmc_host *host)
922 /* Basic card reinitialization. */
923 mmc_claim_host(host);
925 /* Restore power if needed */
926 if (!mmc_card_keep_power(host)) {
927 mmc_power_up(host, host->card->ocr);
929 * Tell runtime PM core we just powered up the card,
930 * since it still believes the card is powered off.
931 * Note that currently runtime PM is only enabled
932 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
934 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
935 pm_runtime_disable(&host->card->dev);
936 pm_runtime_set_active(&host->card->dev);
937 pm_runtime_enable(&host->card->dev);
941 /* No need to reinitialize powered-resumed nonremovable cards */
942 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
945 mmc_send_if_cond(host, host->card->ocr);
946 err = mmc_send_io_op_cond(host, 0, NULL);
948 err = mmc_sdio_init_card(host, host->card->ocr,
950 mmc_card_keep_power(host));
951 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
952 /* We may have switched to 1-bit mode during suspend */
953 err = sdio_enable_4bit_bus(host->card);
956 if (!err && host->sdio_irqs) {
957 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
958 wake_up_process(host->sdio_irq_thread);
959 else if (host->caps & MMC_CAP_SDIO_IRQ)
960 host->ops->enable_sdio_irq(host, 1);
963 mmc_release_host(host);
965 host->pm_flags &= ~MMC_PM_KEEP_POWER;
969 static int mmc_sdio_power_restore(struct mmc_host *host)
976 mmc_claim_host(host);
979 * Reset the card by performing the same steps that are taken by
980 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
982 * sdio_reset() is technically not needed. Having just powered up the
983 * hardware, it should already be in reset state. However, some
984 * platforms (such as SD8686 on OLPC) do not instantly cut power,
985 * meaning that a reset is required when restoring power soon after
986 * powering off. It is harmless in other cases.
988 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
989 * is not necessary for non-removable cards. However, it is required
990 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
991 * harmless in other situations.
997 mmc_send_if_cond(host, host->card->ocr);
999 ret = mmc_send_io_op_cond(host, 0, NULL);
1003 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1004 mmc_card_keep_power(host));
1005 if (!ret && host->sdio_irqs)
1006 mmc_signal_sdio_irq(host);
1009 mmc_release_host(host);
1014 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1016 /* No references to the card, cut the power to it. */
1017 mmc_claim_host(host);
1018 mmc_power_off(host);
1019 mmc_release_host(host);
1024 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1028 /* Restore power and re-initialize. */
1029 mmc_claim_host(host);
1030 mmc_power_up(host, host->card->ocr);
1031 ret = mmc_sdio_power_restore(host);
1032 mmc_release_host(host);
1037 static int mmc_sdio_reset(struct mmc_host *host)
1039 mmc_power_cycle(host, host->card->ocr);
1040 return mmc_sdio_power_restore(host);
1043 static const struct mmc_bus_ops mmc_sdio_ops = {
1044 .remove = mmc_sdio_remove,
1045 .detect = mmc_sdio_detect,
1046 .pre_suspend = mmc_sdio_pre_suspend,
1047 .suspend = mmc_sdio_suspend,
1048 .resume = mmc_sdio_resume,
1049 .runtime_suspend = mmc_sdio_runtime_suspend,
1050 .runtime_resume = mmc_sdio_runtime_resume,
1051 .power_restore = mmc_sdio_power_restore,
1052 .alive = mmc_sdio_alive,
1053 .reset = mmc_sdio_reset,
1058 * Starting point for SDIO card init.
1060 int mmc_attach_sdio(struct mmc_host *host)
1064 struct mmc_card *card;
1067 WARN_ON(!host->claimed);
1069 err = mmc_send_io_op_cond(host, 0, &ocr);
1073 mmc_attach_bus(host, &mmc_sdio_ops);
1074 if (host->ocr_avail_sdio)
1075 host->ocr_avail = host->ocr_avail_sdio;
1078 rocr = mmc_select_voltage(host, ocr);
1081 * Can we support the voltage(s) of the card(s)?
1089 * Detect and init the card.
1091 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1098 * Enable runtime PM only if supported by host+card+board
1100 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1102 * Let runtime PM core know our card is active
1104 err = pm_runtime_set_active(&card->dev);
1109 * Enable runtime PM for this card
1111 pm_runtime_enable(&card->dev);
1115 * The number of functions on the card is encoded inside
1118 funcs = (ocr & 0x70000000) >> 28;
1119 card->sdio_funcs = 0;
1122 * Initialize (but don't add) all present functions.
1124 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1125 err = sdio_init_func(host->card, i + 1);
1130 * Enable Runtime PM for this func (if supported)
1132 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1133 pm_runtime_enable(&card->sdio_func[i]->dev);
1137 * First add the card to the driver model...
1139 mmc_release_host(host);
1140 err = mmc_add_card(host->card);
1145 * ...then the SDIO functions.
1147 for (i = 0;i < funcs;i++) {
1148 err = sdio_add_func(host->card->sdio_func[i]);
1153 mmc_claim_host(host);
1158 /* Remove without lock if the device has been added. */
1159 mmc_sdio_remove(host);
1160 mmc_claim_host(host);
1162 /* And with lock if it hasn't been added. */
1163 mmc_release_host(host);
1165 mmc_sdio_remove(host);
1166 mmc_claim_host(host);
1168 mmc_detach_bus(host);
1170 pr_err("%s: error %d whilst initialising SDIO card\n",
1171 mmc_hostname(host), err);