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_warning("%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 return sdio_enable_wide(card);
298 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
299 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
300 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
306 err = sdio_enable_wide(card);
308 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
315 * Test if the card supports high-speed mode and, if so, switch to it.
317 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
322 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
325 if (!card->cccr.high_speed)
328 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
333 speed |= SDIO_SPEED_EHS;
335 speed &= ~SDIO_SPEED_EHS;
337 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
345 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
347 static int sdio_enable_hs(struct mmc_card *card)
351 ret = mmc_sdio_switch_hs(card, true);
352 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
355 ret = mmc_sd_switch_hs(card);
357 mmc_sdio_switch_hs(card, false);
362 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
366 if (mmc_card_highspeed(card)) {
368 * The SDIO specification doesn't mention how
369 * the CIS transfer speed register relates to
370 * high-speed, but it seems that 50 MHz is
375 max_dtr = card->cis.max_dtr;
378 if (card->type == MMC_TYPE_SD_COMBO)
379 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
384 static unsigned char host_drive_to_sdio_drive(int host_strength)
386 switch (host_strength) {
387 case MMC_SET_DRIVER_TYPE_A:
388 return SDIO_DTSx_SET_TYPE_A;
389 case MMC_SET_DRIVER_TYPE_B:
390 return SDIO_DTSx_SET_TYPE_B;
391 case MMC_SET_DRIVER_TYPE_C:
392 return SDIO_DTSx_SET_TYPE_C;
393 case MMC_SET_DRIVER_TYPE_D:
394 return SDIO_DTSx_SET_TYPE_D;
396 return SDIO_DTSx_SET_TYPE_B;
400 static void sdio_select_driver_type(struct mmc_card *card)
402 int host_drv_type = SD_DRIVER_TYPE_B;
403 int card_drv_type = SD_DRIVER_TYPE_B;
405 unsigned char card_strength;
409 * If the host doesn't support any of the Driver Types A,C or D,
410 * or there is no board specific handler then default Driver
413 if (!(card->host->caps &
414 (MMC_CAP_DRIVER_TYPE_A |
415 MMC_CAP_DRIVER_TYPE_C |
416 MMC_CAP_DRIVER_TYPE_D)))
419 if (!card->host->ops->select_drive_strength)
422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
423 host_drv_type |= SD_DRIVER_TYPE_A;
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
426 host_drv_type |= SD_DRIVER_TYPE_C;
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
429 host_drv_type |= SD_DRIVER_TYPE_D;
431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
432 card_drv_type |= SD_DRIVER_TYPE_A;
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
435 card_drv_type |= SD_DRIVER_TYPE_C;
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
438 card_drv_type |= SD_DRIVER_TYPE_D;
441 * The drive strength that the hardware can support
442 * depends on the board design. Pass the appropriate
443 * information and let the hardware specific code
444 * return what is possible given the options
446 drive_strength = card->host->ops->select_drive_strength(
447 card->sw_caps.uhs_max_dtr,
448 host_drv_type, card_drv_type);
450 /* if error just use default for drive strength B */
451 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
456 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
457 card_strength |= host_drive_to_sdio_drive(drive_strength);
459 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
460 card_strength, NULL);
462 /* if error default to drive strength B */
464 mmc_set_driver_type(card->host, drive_strength);
468 static int sdio_set_bus_speed_mode(struct mmc_card *card)
470 unsigned int bus_speed, timing;
475 * If the host doesn't support any of the UHS-I modes, fallback on
478 if (!mmc_host_uhs(card->host))
481 bus_speed = SDIO_SPEED_SDR12;
482 timing = MMC_TIMING_UHS_SDR12;
483 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
484 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
485 bus_speed = SDIO_SPEED_SDR104;
486 timing = MMC_TIMING_UHS_SDR104;
487 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
488 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
489 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
490 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
491 bus_speed = SDIO_SPEED_DDR50;
492 timing = MMC_TIMING_UHS_DDR50;
493 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
494 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
497 SD_MODE_UHS_SDR50)) {
498 bus_speed = SDIO_SPEED_SDR50;
499 timing = MMC_TIMING_UHS_SDR50;
500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
502 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
503 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
504 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
505 bus_speed = SDIO_SPEED_SDR25;
506 timing = MMC_TIMING_UHS_SDR25;
507 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
508 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
509 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
510 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
511 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
512 SD_MODE_UHS_SDR12)) {
513 bus_speed = SDIO_SPEED_SDR12;
514 timing = MMC_TIMING_UHS_SDR12;
515 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
519 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
523 speed &= ~SDIO_SPEED_BSS_MASK;
525 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
530 mmc_set_timing(card->host, timing);
531 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
538 * UHS-I specific initialization procedure
540 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
544 if (!card->scr.sda_spec3)
548 * Switch to wider bus (if supported).
550 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
551 err = sdio_enable_4bit_bus(card);
553 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
558 /* Set the driver strength for the card */
559 sdio_select_driver_type(card);
561 /* Set bus speed mode of the card */
562 err = sdio_set_bus_speed_mode(card);
567 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
568 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
570 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
571 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
572 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104))) {
573 mmc_host_clk_hold(card->host);
574 err = card->host->ops->execute_tuning(card->host,
575 MMC_SEND_TUNING_BLOCK);
576 mmc_host_clk_release(card->host);
585 * Handle the detection and initialisation of a card.
587 * In the case of a resume, "oldcard" will contain the card
588 * we're trying to reinitialise.
590 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
591 struct mmc_card *oldcard, int powered_resume)
593 struct mmc_card *card;
600 WARN_ON(!host->claimed);
602 /* to query card if 1.8V signalling is supported */
603 if (mmc_host_uhs(host))
604 ocr |= R4_18V_PRESENT;
608 pr_warning("%s: Skipping voltage switch\n",
610 ocr &= ~R4_18V_PRESENT;
614 * Inform the card of the voltage
616 if (!powered_resume) {
617 err = mmc_send_io_op_cond(host, ocr, &rocr);
623 * For SPI, enable CRC as appropriate.
625 if (mmc_host_is_spi(host)) {
626 err = mmc_spi_set_crc(host, use_spi_crc);
632 * Allocate card structure.
634 card = mmc_alloc_card(host, NULL);
640 if ((rocr & R4_MEMORY_PRESENT) &&
641 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
642 card->type = MMC_TYPE_SD_COMBO;
644 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
645 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
646 mmc_remove_card(card);
650 card->type = MMC_TYPE_SDIO;
652 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
653 mmc_remove_card(card);
659 * Call the optional HC's init_card function to handle quirks.
661 if (host->ops->init_card)
662 host->ops->init_card(host, card);
665 * If the host and card support UHS-I mode request the card
666 * to switch to 1.8V signaling level. No 1.8v signalling if
667 * UHS mode is not enabled to maintain compatibility and some
668 * systems that claim 1.8v signalling in fact do not support
671 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
672 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
674 if (err == -EAGAIN) {
677 mmc_send_if_cond(host, host->ocr_avail);
678 mmc_remove_card(card);
682 ocr &= ~R4_18V_PRESENT;
686 ocr &= ~R4_18V_PRESENT;
690 * For native busses: set card RCA and quit open drain mode.
692 if (!powered_resume && !mmc_host_is_spi(host)) {
693 err = mmc_send_relative_addr(host, &card->rca);
698 * Update oldcard with the new RCA received from the SDIO
699 * device -- we're doing this so that it's updated in the
700 * "card" struct when oldcard overwrites that later.
703 oldcard->rca = card->rca;
707 * Read CSD, before selecting the card
709 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
710 err = mmc_sd_get_csd(host, card);
714 mmc_decode_cid(card);
718 * Select card, as all following commands rely on that.
720 if (!powered_resume && !mmc_host_is_spi(host)) {
721 err = mmc_select_card(card);
726 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
728 * This is non-standard SDIO device, meaning it doesn't
729 * have any CIA (Common I/O area) registers present.
730 * It's host's responsibility to fill cccr and cis
731 * structures in init_card().
733 mmc_set_clock(host, card->cis.max_dtr);
735 if (card->cccr.high_speed) {
736 mmc_card_set_highspeed(card);
737 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
744 * Read the common registers.
746 err = sdio_read_cccr(card, ocr);
751 * Read the common CIS tuples.
753 err = sdio_read_common_cis(card);
758 int same = (card->cis.vendor == oldcard->cis.vendor &&
759 card->cis.device == oldcard->cis.device);
760 mmc_remove_card(card);
766 card->ocr = ocr_card;
767 mmc_fixup_device(card, NULL);
769 if (card->type == MMC_TYPE_SD_COMBO) {
770 err = mmc_sd_setup_card(host, card, oldcard != NULL);
771 /* handle as SDIO-only card if memory init failed */
774 if (mmc_host_is_spi(host))
775 /* should not fail, as it worked previously */
776 mmc_spi_set_crc(host, use_spi_crc);
777 card->type = MMC_TYPE_SDIO;
779 card->dev.type = &sd_type;
783 * If needed, disconnect card detection pull-up resistor.
785 err = sdio_disable_cd(card);
789 /* Initialization sequence for UHS-I cards */
790 /* Only if card supports 1.8v and UHS signaling */
791 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
792 err = mmc_sdio_init_uhs_card(card);
796 /* Card is an ultra-high-speed card */
797 mmc_card_set_uhs(card);
800 * Switch to high-speed (if supported).
802 err = sdio_enable_hs(card);
804 mmc_sd_go_highspeed(card);
809 * Change to the card's maximum speed.
811 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
814 * Switch to wider bus (if supported).
816 err = sdio_enable_4bit_bus(card);
818 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
829 mmc_remove_card(card);
836 * Host is being removed. Free up the current card.
838 static void mmc_sdio_remove(struct mmc_host *host)
845 for (i = 0;i < host->card->sdio_funcs;i++) {
846 if (host->card->sdio_func[i]) {
847 sdio_remove_func(host->card->sdio_func[i]);
848 host->card->sdio_func[i] = NULL;
852 mmc_remove_card(host->card);
857 * Card detection - card is alive.
859 static int mmc_sdio_alive(struct mmc_host *host)
861 return mmc_select_card(host->card);
865 * Card detection callback from host.
867 static void mmc_sdio_detect(struct mmc_host *host)
874 /* Make sure card is powered before detecting it */
875 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
876 err = pm_runtime_get_sync(&host->card->dev);
878 pm_runtime_put_noidle(&host->card->dev);
883 mmc_claim_host(host);
886 * Just check if our card has been removed.
888 err = _mmc_detect_card_removed(host);
890 mmc_release_host(host);
893 * Tell PM core it's OK to power off the card now.
895 * The _sync variant is used in order to ensure that the card
896 * is left powered off in case an error occurred, and the card
897 * is going to be removed.
899 * Since there is no specific reason to believe a new user
900 * is about to show up at this point, the _sync variant is
903 if (host->caps & MMC_CAP_POWER_OFF_CARD)
904 pm_runtime_put_sync(&host->card->dev);
908 mmc_sdio_remove(host);
910 mmc_claim_host(host);
911 mmc_detach_bus(host);
913 mmc_release_host(host);
918 * SDIO pre_suspend. We need to suspend all functions separately.
919 * Therefore all registered functions must have drivers with suspend
920 * and resume methods. Failing that we simply remove the whole card.
922 static int mmc_sdio_pre_suspend(struct mmc_host *host)
926 for (i = 0; i < host->card->sdio_funcs; i++) {
927 struct sdio_func *func = host->card->sdio_func[i];
928 if (func && sdio_func_present(func) && func->dev.driver) {
929 const struct dev_pm_ops *pmops = func->dev.driver->pm;
930 if (!pmops || !pmops->suspend || !pmops->resume) {
931 /* force removal of entire card in that case */
942 * SDIO suspend. Suspend all functions separately.
944 static int mmc_sdio_suspend(struct mmc_host *host)
948 for (i = 0; i < host->card->sdio_funcs; i++) {
949 struct sdio_func *func = host->card->sdio_func[i];
950 if (func && sdio_func_present(func) && func->dev.driver) {
951 const struct dev_pm_ops *pmops = func->dev.driver->pm;
952 err = pmops->suspend(&func->dev);
957 while (err && --i >= 0) {
958 struct sdio_func *func = host->card->sdio_func[i];
959 if (func && sdio_func_present(func) && func->dev.driver) {
960 const struct dev_pm_ops *pmops = func->dev.driver->pm;
961 pmops->resume(&func->dev);
965 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
966 mmc_claim_host(host);
967 sdio_disable_wide(host->card);
968 mmc_release_host(host);
971 if (!err && !mmc_card_keep_power(host))
977 static int mmc_sdio_resume(struct mmc_host *host)
984 /* Basic card reinitialization. */
985 mmc_claim_host(host);
987 /* Restore power if needed */
988 if (!mmc_card_keep_power(host)) {
989 mmc_power_up(host, host->card->ocr);
991 * Tell runtime PM core we just powered up the card,
992 * since it still believes the card is powered off.
993 * Note that currently runtime PM is only enabled
994 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
996 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
997 pm_runtime_disable(&host->card->dev);
998 pm_runtime_set_active(&host->card->dev);
999 pm_runtime_enable(&host->card->dev);
1003 /* No need to reinitialize powered-resumed nonremovable cards */
1004 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
1007 err = mmc_sdio_init_card(host, host->card->ocr, host->card,
1008 mmc_card_keep_power(host));
1009 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1010 /* We may have switched to 1-bit mode during suspend */
1011 err = sdio_enable_4bit_bus(host->card);
1013 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1018 if (!err && host->sdio_irqs)
1019 wake_up_process(host->sdio_irq_thread);
1020 mmc_release_host(host);
1023 * If the card looked to be the same as before suspending, then
1024 * we proceed to resume all card functions. If one of them returns
1025 * an error then we simply return that error to the core and the
1026 * card will be redetected as new. It is the responsibility of
1027 * the function driver to perform further tests with the extra
1028 * knowledge it has of the card to confirm the card is indeed the
1029 * same as before suspending (same MAC address for network cards,
1030 * etc.) and return an error otherwise.
1032 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
1033 struct sdio_func *func = host->card->sdio_func[i];
1034 if (func && sdio_func_present(func) && func->dev.driver) {
1035 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1036 err = pmops->resume(&func->dev);
1040 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1044 static int mmc_sdio_power_restore(struct mmc_host *host)
1049 BUG_ON(!host->card);
1051 mmc_claim_host(host);
1054 * Reset the card by performing the same steps that are taken by
1055 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1057 * sdio_reset() is technically not needed. Having just powered up the
1058 * hardware, it should already be in reset state. However, some
1059 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1060 * meaning that a reset is required when restoring power soon after
1061 * powering off. It is harmless in other cases.
1063 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1064 * is not necessary for non-removable cards. However, it is required
1065 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1066 * harmless in other situations.
1072 mmc_send_if_cond(host, host->ocr_avail);
1074 ret = mmc_send_io_op_cond(host, 0, NULL);
1078 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1079 mmc_card_keep_power(host));
1080 if (!ret && host->sdio_irqs)
1081 mmc_signal_sdio_irq(host);
1084 mmc_release_host(host);
1089 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1091 /* No references to the card, cut the power to it. */
1092 mmc_power_off(host);
1096 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1098 /* Restore power and re-initialize. */
1099 mmc_power_up(host, host->card->ocr);
1100 return mmc_sdio_power_restore(host);
1103 static const struct mmc_bus_ops mmc_sdio_ops = {
1104 .remove = mmc_sdio_remove,
1105 .detect = mmc_sdio_detect,
1106 .pre_suspend = mmc_sdio_pre_suspend,
1107 .suspend = mmc_sdio_suspend,
1108 .resume = mmc_sdio_resume,
1109 .runtime_suspend = mmc_sdio_runtime_suspend,
1110 .runtime_resume = mmc_sdio_runtime_resume,
1111 .power_restore = mmc_sdio_power_restore,
1112 .alive = mmc_sdio_alive,
1117 * Starting point for SDIO card init.
1119 int mmc_attach_sdio(struct mmc_host *host)
1123 struct mmc_card *card;
1126 WARN_ON(!host->claimed);
1128 err = mmc_send_io_op_cond(host, 0, &ocr);
1132 mmc_attach_bus(host, &mmc_sdio_ops);
1133 if (host->ocr_avail_sdio)
1134 host->ocr_avail = host->ocr_avail_sdio;
1137 rocr = mmc_select_voltage(host, ocr);
1140 * Can we support the voltage(s) of the card(s)?
1148 * Detect and init the card.
1150 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1157 * Enable runtime PM only if supported by host+card+board
1159 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1161 * Let runtime PM core know our card is active
1163 err = pm_runtime_set_active(&card->dev);
1168 * Enable runtime PM for this card
1170 pm_runtime_enable(&card->dev);
1174 * The number of functions on the card is encoded inside
1177 funcs = (ocr & 0x70000000) >> 28;
1178 card->sdio_funcs = 0;
1181 * Initialize (but don't add) all present functions.
1183 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1184 err = sdio_init_func(host->card, i + 1);
1189 * Enable Runtime PM for this func (if supported)
1191 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1192 pm_runtime_enable(&card->sdio_func[i]->dev);
1196 * First add the card to the driver model...
1198 mmc_release_host(host);
1199 err = mmc_add_card(host->card);
1204 * ...then the SDIO functions.
1206 for (i = 0;i < funcs;i++) {
1207 err = sdio_add_func(host->card->sdio_func[i]);
1212 mmc_claim_host(host);
1217 /* Remove without lock if the device has been added. */
1218 mmc_sdio_remove(host);
1219 mmc_claim_host(host);
1221 /* And with lock if it hasn't been added. */
1222 mmc_release_host(host);
1224 mmc_sdio_remove(host);
1225 mmc_claim_host(host);
1227 mmc_detach_bus(host);
1229 pr_err("%s: error %d whilst initialising SDIO card\n",
1230 mmc_hostname(host), err);