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>
34 static int sdio_read_fbr(struct sdio_func *func)
39 if (mmc_card_nonstd_func_interface(func->card)) {
40 func->class = SDIO_CLASS_NONE;
44 ret = mmc_io_rw_direct(func->card, 0, 0,
45 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
52 ret = mmc_io_rw_direct(func->card, 0, 0,
53 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
64 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
67 struct sdio_func *func;
69 if (WARN_ON(fn > SDIO_MAX_FUNCS))
72 func = sdio_alloc_func(card);
78 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
79 ret = sdio_read_fbr(func);
83 ret = sdio_read_func_cis(func);
87 func->vendor = func->card->cis.vendor;
88 func->device = func->card->cis.device;
89 func->max_blksize = func->card->cis.blksize;
92 card->sdio_func[fn - 1] = func;
98 * It is okay to remove the function here even though we hold
99 * the host lock as we haven't registered the device yet.
101 sdio_remove_func(func);
105 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
109 int uhs = ocr & R4_18V_PRESENT;
113 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
117 cccr_vsn = data & 0x0f;
119 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
120 pr_err("%s: unrecognised CCCR structure version %d\n",
121 mmc_hostname(card->host), cccr_vsn);
125 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
131 if (data & SDIO_CCCR_CAP_SMB)
132 card->cccr.multi_block = 1;
133 if (data & SDIO_CCCR_CAP_LSC)
134 card->cccr.low_speed = 1;
135 if (data & SDIO_CCCR_CAP_4BLS)
136 card->cccr.wide_bus = 1;
138 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
139 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
143 if (data & SDIO_POWER_SMPC)
144 card->cccr.high_power = 1;
147 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
148 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
152 card->scr.sda_spec3 = 0;
153 card->sw_caps.sd3_bus_mode = 0;
154 card->sw_caps.sd3_drv_type = 0;
155 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
156 card->scr.sda_spec3 = 1;
157 ret = mmc_io_rw_direct(card, 0, 0,
158 SDIO_CCCR_UHS, 0, &data);
162 if (mmc_host_uhs(card->host)) {
163 if (data & SDIO_UHS_DDR50)
164 card->sw_caps.sd3_bus_mode
165 |= SD_MODE_UHS_DDR50;
167 if (data & SDIO_UHS_SDR50)
168 card->sw_caps.sd3_bus_mode
169 |= SD_MODE_UHS_SDR50;
171 if (data & SDIO_UHS_SDR104)
172 card->sw_caps.sd3_bus_mode
173 |= SD_MODE_UHS_SDR104;
176 ret = mmc_io_rw_direct(card, 0, 0,
177 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
181 if (data & SDIO_DRIVE_SDTA)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
183 if (data & SDIO_DRIVE_SDTC)
184 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
185 if (data & SDIO_DRIVE_SDTD)
186 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
189 /* if no uhs mode ensure we check for high speed */
190 if (!card->sw_caps.sd3_bus_mode) {
191 if (speed & SDIO_SPEED_SHS) {
192 card->cccr.high_speed = 1;
193 card->sw_caps.hs_max_dtr = 50000000;
195 card->cccr.high_speed = 0;
196 card->sw_caps.hs_max_dtr = 25000000;
205 static int sdio_enable_wide(struct mmc_card *card)
210 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
213 if (card->cccr.low_speed && !card->cccr.wide_bus)
216 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
220 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
221 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
222 mmc_hostname(card->host), ctrl);
224 /* set as 4-bit bus width */
225 ctrl &= ~SDIO_BUS_WIDTH_MASK;
226 ctrl |= SDIO_BUS_WIDTH_4BIT;
228 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
236 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
237 * of the card. This may be required on certain setups of boards,
238 * controllers and embedded sdio device which do not need the card's
239 * pull-up. As a result, card detection is disabled and power is saved.
241 static int sdio_disable_cd(struct mmc_card *card)
246 if (!mmc_card_disable_cd(card))
249 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
253 ctrl |= SDIO_BUS_CD_DISABLE;
255 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
259 * Devices that remain active during a system suspend are
260 * put back into 1-bit mode.
262 static int sdio_disable_wide(struct mmc_card *card)
267 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
270 if (card->cccr.low_speed && !card->cccr.wide_bus)
273 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
277 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
280 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
281 ctrl |= SDIO_BUS_ASYNC_INT;
283 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
287 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
293 static int sdio_enable_4bit_bus(struct mmc_card *card)
297 if (card->type == MMC_TYPE_SDIO)
298 err = sdio_enable_wide(card);
299 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
300 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
301 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
304 err = sdio_enable_wide(card);
306 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
311 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
320 * Test if the card supports high-speed mode and, if so, switch to it.
322 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
327 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
330 if (!card->cccr.high_speed)
333 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
338 speed |= SDIO_SPEED_EHS;
340 speed &= ~SDIO_SPEED_EHS;
342 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
350 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
352 static int sdio_enable_hs(struct mmc_card *card)
356 ret = mmc_sdio_switch_hs(card, true);
357 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
360 ret = mmc_sd_switch_hs(card);
362 mmc_sdio_switch_hs(card, false);
367 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
371 if (mmc_card_hs(card)) {
373 * The SDIO specification doesn't mention how
374 * the CIS transfer speed register relates to
375 * high-speed, but it seems that 50 MHz is
380 max_dtr = card->cis.max_dtr;
383 if (card->type == MMC_TYPE_SD_COMBO)
384 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
389 static unsigned char host_drive_to_sdio_drive(int host_strength)
391 switch (host_strength) {
392 case MMC_SET_DRIVER_TYPE_A:
393 return SDIO_DTSx_SET_TYPE_A;
394 case MMC_SET_DRIVER_TYPE_B:
395 return SDIO_DTSx_SET_TYPE_B;
396 case MMC_SET_DRIVER_TYPE_C:
397 return SDIO_DTSx_SET_TYPE_C;
398 case MMC_SET_DRIVER_TYPE_D:
399 return SDIO_DTSx_SET_TYPE_D;
401 return SDIO_DTSx_SET_TYPE_B;
405 static void sdio_select_driver_type(struct mmc_card *card)
407 int card_drv_type, drive_strength, drv_type;
408 unsigned char card_strength;
411 card->drive_strength = 0;
413 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
415 drive_strength = mmc_select_drive_strength(card,
416 card->sw_caps.uhs_max_dtr,
417 card_drv_type, &drv_type);
419 if (drive_strength) {
420 /* if error just use default for drive strength B */
421 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
426 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
427 card_strength |= host_drive_to_sdio_drive(drive_strength);
429 /* if error default to drive strength B */
430 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
431 card_strength, NULL);
434 card->drive_strength = drive_strength;
438 mmc_set_driver_type(card->host, drv_type);
442 static int sdio_set_bus_speed_mode(struct mmc_card *card)
444 unsigned int bus_speed, timing;
447 unsigned int max_rate;
450 * If the host doesn't support any of the UHS-I modes, fallback on
453 if (!mmc_host_uhs(card->host))
456 bus_speed = SDIO_SPEED_SDR12;
457 timing = MMC_TIMING_UHS_SDR12;
458 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
459 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
460 bus_speed = SDIO_SPEED_SDR104;
461 timing = MMC_TIMING_UHS_SDR104;
462 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
463 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
464 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
465 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
466 bus_speed = SDIO_SPEED_DDR50;
467 timing = MMC_TIMING_UHS_DDR50;
468 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
469 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
470 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
471 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
472 SD_MODE_UHS_SDR50)) {
473 bus_speed = SDIO_SPEED_SDR50;
474 timing = MMC_TIMING_UHS_SDR50;
475 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
476 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
477 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
478 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
479 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
480 bus_speed = SDIO_SPEED_SDR25;
481 timing = MMC_TIMING_UHS_SDR25;
482 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
483 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
484 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
485 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
486 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
487 SD_MODE_UHS_SDR12)) {
488 bus_speed = SDIO_SPEED_SDR12;
489 timing = MMC_TIMING_UHS_SDR12;
490 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
491 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
494 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
498 speed &= ~SDIO_SPEED_BSS_MASK;
500 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
504 max_rate = min_not_zero(card->quirk_max_rate,
505 card->sw_caps.uhs_max_dtr);
508 mmc_set_timing(card->host, timing);
509 mmc_set_clock(card->host, max_rate);
516 * UHS-I specific initialization procedure
518 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
522 if (!card->scr.sda_spec3)
525 /* Switch to wider bus */
526 err = sdio_enable_4bit_bus(card);
530 /* Set the driver strength for the card */
531 sdio_select_driver_type(card);
533 /* Set bus speed mode of the card */
534 err = sdio_set_bus_speed_mode(card);
539 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
540 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
542 if (!mmc_host_is_spi(card->host) &&
543 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
544 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
545 err = mmc_execute_tuning(card);
550 static void mmc_sdio_resend_if_cond(struct mmc_host *host,
551 struct mmc_card *card)
555 mmc_send_if_cond(host, host->ocr_avail);
556 mmc_remove_card(card);
560 * Handle the detection and initialisation of a card.
562 * In the case of a resume, "oldcard" will contain the card
563 * we're trying to reinitialise.
565 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
566 struct mmc_card *oldcard, int powered_resume)
568 struct mmc_card *card;
574 WARN_ON(!host->claimed);
576 /* to query card if 1.8V signalling is supported */
577 if (mmc_host_uhs(host))
578 ocr |= R4_18V_PRESENT;
582 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
583 ocr &= ~R4_18V_PRESENT;
587 * Inform the card of the voltage
589 if (!powered_resume) {
590 err = mmc_send_io_op_cond(host, ocr, &rocr);
596 * For SPI, enable CRC as appropriate.
598 if (mmc_host_is_spi(host)) {
599 err = mmc_spi_set_crc(host, use_spi_crc);
605 * Allocate card structure.
607 card = mmc_alloc_card(host, NULL);
613 if ((rocr & R4_MEMORY_PRESENT) &&
614 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
615 card->type = MMC_TYPE_SD_COMBO;
617 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
618 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
619 mmc_remove_card(card);
623 card->type = MMC_TYPE_SDIO;
625 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
626 mmc_remove_card(card);
632 * Call the optional HC's init_card function to handle quirks.
634 if (host->ops->init_card)
635 host->ops->init_card(host, card);
638 * If the host and card support UHS-I mode request the card
639 * to switch to 1.8V signaling level. No 1.8v signalling if
640 * UHS mode is not enabled to maintain compatibility and some
641 * systems that claim 1.8v signalling in fact do not support
642 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
643 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
644 * fails to check rocr & R4_18V_PRESENT, but we still need to
645 * try to init uhs card. sdio_read_cccr will take over this task
646 * to make sure which speed mode should work.
648 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
649 err = mmc_set_uhs_voltage(host, ocr_card);
650 if (err == -EAGAIN) {
651 mmc_sdio_resend_if_cond(host, card);
655 ocr &= ~R4_18V_PRESENT;
660 * For native busses: set card RCA and quit open drain mode.
662 if (!powered_resume && !mmc_host_is_spi(host)) {
663 err = mmc_send_relative_addr(host, &card->rca);
668 * Update oldcard with the new RCA received from the SDIO
669 * device -- we're doing this so that it's updated in the
670 * "card" struct when oldcard overwrites that later.
673 oldcard->rca = card->rca;
677 * Read CSD, before selecting the card
679 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
680 err = mmc_sd_get_csd(host, card);
684 mmc_decode_cid(card);
688 * Select card, as all following commands rely on that.
690 if (!powered_resume && !mmc_host_is_spi(host)) {
691 err = mmc_select_card(card);
696 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
698 * This is non-standard SDIO device, meaning it doesn't
699 * have any CIA (Common I/O area) registers present.
700 * It's host's responsibility to fill cccr and cis
701 * structures in init_card().
703 mmc_set_clock(host, card->cis.max_dtr);
705 if (card->cccr.high_speed) {
706 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
713 * Read the common registers. Note that we should try to
714 * validate whether UHS would work or not.
716 err = sdio_read_cccr(card, ocr);
718 mmc_sdio_resend_if_cond(host, card);
719 if (ocr & R4_18V_PRESENT) {
720 /* Retry init sequence, but without R4_18V_PRESENT. */
729 * Read the common CIS tuples.
731 err = sdio_read_common_cis(card);
736 int same = (card->cis.vendor == oldcard->cis.vendor &&
737 card->cis.device == oldcard->cis.device);
738 mmc_remove_card(card);
744 card->ocr = ocr_card;
745 mmc_fixup_device(card, sdio_fixup_methods);
747 if (card->type == MMC_TYPE_SD_COMBO) {
748 err = mmc_sd_setup_card(host, card, oldcard != NULL);
749 /* handle as SDIO-only card if memory init failed */
752 if (mmc_host_is_spi(host))
753 /* should not fail, as it worked previously */
754 mmc_spi_set_crc(host, use_spi_crc);
755 card->type = MMC_TYPE_SDIO;
757 card->dev.type = &sd_type;
761 * If needed, disconnect card detection pull-up resistor.
763 err = sdio_disable_cd(card);
767 /* Initialization sequence for UHS-I cards */
768 /* Only if card supports 1.8v and UHS signaling */
769 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
770 err = mmc_sdio_init_uhs_card(card);
775 * Switch to high-speed (if supported).
777 err = sdio_enable_hs(card);
779 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
784 * Change to the card's maximum speed.
786 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
789 * Switch to wider bus (if supported).
791 err = sdio_enable_4bit_bus(card);
796 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
797 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
798 pr_err("%s: Host failed to negotiate down from 3.3V\n",
810 mmc_remove_card(card);
816 static int mmc_sdio_reinit_card(struct mmc_host *host, bool powered_resume)
822 mmc_send_if_cond(host, host->card->ocr);
824 ret = mmc_send_io_op_cond(host, 0, NULL);
828 return mmc_sdio_init_card(host, host->card->ocr, host->card,
833 * Host is being removed. Free up the current card.
835 static void mmc_sdio_remove(struct mmc_host *host)
839 for (i = 0;i < host->card->sdio_funcs;i++) {
840 if (host->card->sdio_func[i]) {
841 sdio_remove_func(host->card->sdio_func[i]);
842 host->card->sdio_func[i] = NULL;
846 mmc_remove_card(host->card);
851 * Card detection - card is alive.
853 static int mmc_sdio_alive(struct mmc_host *host)
855 return mmc_select_card(host->card);
859 * Card detection callback from host.
861 static void mmc_sdio_detect(struct mmc_host *host)
865 /* Make sure card is powered before detecting it */
866 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
867 err = pm_runtime_get_sync(&host->card->dev);
869 pm_runtime_put_noidle(&host->card->dev);
874 mmc_claim_host(host);
877 * Just check if our card has been removed.
879 err = _mmc_detect_card_removed(host);
881 mmc_release_host(host);
884 * Tell PM core it's OK to power off the card now.
886 * The _sync variant is used in order to ensure that the card
887 * is left powered off in case an error occurred, and the card
888 * is going to be removed.
890 * Since there is no specific reason to believe a new user
891 * is about to show up at this point, the _sync variant is
894 if (host->caps & MMC_CAP_POWER_OFF_CARD)
895 pm_runtime_put_sync(&host->card->dev);
899 mmc_sdio_remove(host);
901 mmc_claim_host(host);
902 mmc_detach_bus(host);
904 mmc_release_host(host);
909 * SDIO pre_suspend. We need to suspend all functions separately.
910 * Therefore all registered functions must have drivers with suspend
911 * and resume methods. Failing that we simply remove the whole card.
913 static int mmc_sdio_pre_suspend(struct mmc_host *host)
917 for (i = 0; i < host->card->sdio_funcs; i++) {
918 struct sdio_func *func = host->card->sdio_func[i];
919 if (func && sdio_func_present(func) && func->dev.driver) {
920 const struct dev_pm_ops *pmops = func->dev.driver->pm;
921 if (!pmops || !pmops->suspend || !pmops->resume) {
922 /* force removal of entire card in that case */
933 * SDIO suspend. Suspend all functions separately.
935 static int mmc_sdio_suspend(struct mmc_host *host)
937 mmc_claim_host(host);
939 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
940 sdio_disable_wide(host->card);
942 if (!mmc_card_keep_power(host)) {
944 } else if (host->retune_period) {
945 mmc_retune_timer_stop(host);
946 mmc_retune_needed(host);
949 mmc_release_host(host);
954 static int mmc_sdio_resume(struct mmc_host *host)
958 /* Basic card reinitialization. */
959 mmc_claim_host(host);
961 /* Restore power if needed */
962 if (!mmc_card_keep_power(host)) {
963 mmc_power_up(host, host->card->ocr);
965 * Tell runtime PM core we just powered up the card,
966 * since it still believes the card is powered off.
967 * Note that currently runtime PM is only enabled
968 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
970 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
971 pm_runtime_disable(&host->card->dev);
972 pm_runtime_set_active(&host->card->dev);
973 pm_runtime_enable(&host->card->dev);
977 /* No need to reinitialize powered-resumed nonremovable cards */
978 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
979 err = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
980 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
981 /* We may have switched to 1-bit mode during suspend */
982 err = sdio_enable_4bit_bus(host->card);
985 if (!err && host->sdio_irqs) {
986 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
987 wake_up_process(host->sdio_irq_thread);
988 else if (host->caps & MMC_CAP_SDIO_IRQ)
989 host->ops->enable_sdio_irq(host, 1);
992 mmc_release_host(host);
994 host->pm_flags &= ~MMC_PM_KEEP_POWER;
998 static int mmc_sdio_power_restore(struct mmc_host *host)
1003 * Reset the card by performing the same steps that are taken by
1004 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1006 * sdio_reset() is technically not needed. Having just powered up the
1007 * hardware, it should already be in reset state. However, some
1008 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1009 * meaning that a reset is required when restoring power soon after
1010 * powering off. It is harmless in other cases.
1012 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1013 * is not necessary for non-removable cards. However, it is required
1014 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1015 * harmless in other situations.
1019 mmc_claim_host(host);
1021 ret = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
1022 if (!ret && host->sdio_irqs)
1023 mmc_signal_sdio_irq(host);
1025 mmc_release_host(host);
1030 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1032 /* No references to the card, cut the power to it. */
1033 mmc_claim_host(host);
1034 mmc_power_off(host);
1035 mmc_release_host(host);
1040 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1044 /* Restore power and re-initialize. */
1045 mmc_claim_host(host);
1046 mmc_power_up(host, host->card->ocr);
1047 ret = mmc_sdio_power_restore(host);
1048 mmc_release_host(host);
1053 static int mmc_sdio_hw_reset(struct mmc_host *host)
1055 mmc_power_cycle(host, host->card->ocr);
1056 return mmc_sdio_power_restore(host);
1059 static int mmc_sdio_sw_reset(struct mmc_host *host)
1061 mmc_set_clock(host, host->f_init);
1065 mmc_set_initial_state(host);
1066 mmc_set_initial_signal_voltage(host);
1068 return mmc_sdio_reinit_card(host, 0);
1071 static const struct mmc_bus_ops mmc_sdio_ops = {
1072 .remove = mmc_sdio_remove,
1073 .detect = mmc_sdio_detect,
1074 .pre_suspend = mmc_sdio_pre_suspend,
1075 .suspend = mmc_sdio_suspend,
1076 .resume = mmc_sdio_resume,
1077 .runtime_suspend = mmc_sdio_runtime_suspend,
1078 .runtime_resume = mmc_sdio_runtime_resume,
1079 .alive = mmc_sdio_alive,
1080 .hw_reset = mmc_sdio_hw_reset,
1081 .sw_reset = mmc_sdio_sw_reset,
1086 * Starting point for SDIO card init.
1088 int mmc_attach_sdio(struct mmc_host *host)
1092 struct mmc_card *card;
1094 WARN_ON(!host->claimed);
1096 err = mmc_send_io_op_cond(host, 0, &ocr);
1100 mmc_attach_bus(host, &mmc_sdio_ops);
1101 if (host->ocr_avail_sdio)
1102 host->ocr_avail = host->ocr_avail_sdio;
1105 rocr = mmc_select_voltage(host, ocr);
1108 * Can we support the voltage(s) of the card(s)?
1116 * Detect and init the card.
1118 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1125 * Enable runtime PM only if supported by host+card+board
1127 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1129 * Do not allow runtime suspend until after SDIO function
1130 * devices are added.
1132 pm_runtime_get_noresume(&card->dev);
1135 * Let runtime PM core know our card is active
1137 err = pm_runtime_set_active(&card->dev);
1142 * Enable runtime PM for this card
1144 pm_runtime_enable(&card->dev);
1148 * The number of functions on the card is encoded inside
1151 funcs = (ocr & 0x70000000) >> 28;
1152 card->sdio_funcs = 0;
1155 * Initialize (but don't add) all present functions.
1157 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1158 err = sdio_init_func(host->card, i + 1);
1163 * Enable Runtime PM for this func (if supported)
1165 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1166 pm_runtime_enable(&card->sdio_func[i]->dev);
1170 * First add the card to the driver model...
1172 mmc_release_host(host);
1173 err = mmc_add_card(host->card);
1178 * ...then the SDIO functions.
1180 for (i = 0;i < funcs;i++) {
1181 err = sdio_add_func(host->card->sdio_func[i]);
1186 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1187 pm_runtime_put(&card->dev);
1189 mmc_claim_host(host);
1194 mmc_release_host(host);
1197 * The devices are being deleted so it is not necessary to disable
1198 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1199 * because it needs to be active to remove any function devices that
1200 * were probed, and after that it gets deleted.
1202 mmc_sdio_remove(host);
1203 mmc_claim_host(host);
1205 mmc_detach_bus(host);
1207 pr_err("%s: error %d whilst initialising SDIO card\n",
1208 mmc_hostname(host), err);