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);
637 card->ocr = ocr_card;
640 * If the host and card support UHS-I mode request the card
641 * to switch to 1.8V signaling level. No 1.8v signalling if
642 * UHS mode is not enabled to maintain compatibility and some
643 * systems that claim 1.8v signalling in fact do not support
644 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
645 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
646 * fails to check rocr & R4_18V_PRESENT, but we still need to
647 * try to init uhs card. sdio_read_cccr will take over this task
648 * to make sure which speed mode should work.
650 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
651 err = mmc_set_uhs_voltage(host, ocr_card);
652 if (err == -EAGAIN) {
653 mmc_sdio_resend_if_cond(host, card);
657 ocr &= ~R4_18V_PRESENT;
662 * For native busses: set card RCA and quit open drain mode.
664 if (!powered_resume && !mmc_host_is_spi(host)) {
665 err = mmc_send_relative_addr(host, &card->rca);
670 * Update oldcard with the new RCA received from the SDIO
671 * device -- we're doing this so that it's updated in the
672 * "card" struct when oldcard overwrites that later.
675 oldcard->rca = card->rca;
679 * Read CSD, before selecting the card
681 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
682 err = mmc_sd_get_csd(host, card);
686 mmc_decode_cid(card);
690 * Select card, as all following commands rely on that.
692 if (!powered_resume && !mmc_host_is_spi(host)) {
693 err = mmc_select_card(card);
698 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
700 * This is non-standard SDIO device, meaning it doesn't
701 * have any CIA (Common I/O area) registers present.
702 * It's host's responsibility to fill cccr and cis
703 * structures in init_card().
705 mmc_set_clock(host, card->cis.max_dtr);
707 if (card->cccr.high_speed) {
708 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
715 * Read the common registers. Note that we should try to
716 * validate whether UHS would work or not.
718 err = sdio_read_cccr(card, ocr);
720 mmc_sdio_resend_if_cond(host, card);
721 if (ocr & R4_18V_PRESENT) {
722 /* Retry init sequence, but without R4_18V_PRESENT. */
730 * Read the common CIS tuples.
732 err = sdio_read_common_cis(card);
737 int same = (card->cis.vendor == oldcard->cis.vendor &&
738 card->cis.device == oldcard->cis.device);
739 mmc_remove_card(card);
746 mmc_fixup_device(card, sdio_fixup_methods);
748 if (card->type == MMC_TYPE_SD_COMBO) {
749 err = mmc_sd_setup_card(host, card, oldcard != NULL);
750 /* handle as SDIO-only card if memory init failed */
753 if (mmc_host_is_spi(host))
754 /* should not fail, as it worked previously */
755 mmc_spi_set_crc(host, use_spi_crc);
756 card->type = MMC_TYPE_SDIO;
758 card->dev.type = &sd_type;
762 * If needed, disconnect card detection pull-up resistor.
764 err = sdio_disable_cd(card);
768 /* Initialization sequence for UHS-I cards */
769 /* Only if card supports 1.8v and UHS signaling */
770 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
771 err = mmc_sdio_init_uhs_card(card);
776 * Switch to high-speed (if supported).
778 err = sdio_enable_hs(card);
780 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
785 * Change to the card's maximum speed.
787 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
790 * Switch to wider bus (if supported).
792 err = sdio_enable_4bit_bus(card);
797 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
798 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
799 pr_err("%s: Host failed to negotiate down from 3.3V\n",
811 mmc_remove_card(card);
817 static int mmc_sdio_reinit_card(struct mmc_host *host, bool powered_resume)
823 mmc_send_if_cond(host, host->card->ocr);
825 ret = mmc_send_io_op_cond(host, 0, NULL);
829 return mmc_sdio_init_card(host, host->card->ocr, host->card,
834 * Host is being removed. Free up the current card.
836 static void mmc_sdio_remove(struct mmc_host *host)
840 for (i = 0;i < host->card->sdio_funcs;i++) {
841 if (host->card->sdio_func[i]) {
842 sdio_remove_func(host->card->sdio_func[i]);
843 host->card->sdio_func[i] = NULL;
847 mmc_remove_card(host->card);
852 * Card detection - card is alive.
854 static int mmc_sdio_alive(struct mmc_host *host)
856 return mmc_select_card(host->card);
860 * Card detection callback from host.
862 static void mmc_sdio_detect(struct mmc_host *host)
866 /* Make sure card is powered before detecting it */
867 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
868 err = pm_runtime_get_sync(&host->card->dev);
870 pm_runtime_put_noidle(&host->card->dev);
875 mmc_claim_host(host);
878 * Just check if our card has been removed.
880 err = _mmc_detect_card_removed(host);
882 mmc_release_host(host);
885 * Tell PM core it's OK to power off the card now.
887 * The _sync variant is used in order to ensure that the card
888 * is left powered off in case an error occurred, and the card
889 * is going to be removed.
891 * Since there is no specific reason to believe a new user
892 * is about to show up at this point, the _sync variant is
895 if (host->caps & MMC_CAP_POWER_OFF_CARD)
896 pm_runtime_put_sync(&host->card->dev);
900 mmc_sdio_remove(host);
902 mmc_claim_host(host);
903 mmc_detach_bus(host);
905 mmc_release_host(host);
910 * SDIO pre_suspend. We need to suspend all functions separately.
911 * Therefore all registered functions must have drivers with suspend
912 * and resume methods. Failing that we simply remove the whole card.
914 static int mmc_sdio_pre_suspend(struct mmc_host *host)
918 for (i = 0; i < host->card->sdio_funcs; i++) {
919 struct sdio_func *func = host->card->sdio_func[i];
920 if (func && sdio_func_present(func) && func->dev.driver) {
921 const struct dev_pm_ops *pmops = func->dev.driver->pm;
922 if (!pmops || !pmops->suspend || !pmops->resume) {
923 /* force removal of entire card in that case */
934 * SDIO suspend. Suspend all functions separately.
936 static int mmc_sdio_suspend(struct mmc_host *host)
938 /* Prevent processing of SDIO IRQs in suspended state. */
939 mmc_card_set_suspended(host->card);
940 cancel_delayed_work_sync(&host->sdio_irq_work);
942 mmc_claim_host(host);
944 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
945 sdio_disable_wide(host->card);
947 if (!mmc_card_keep_power(host)) {
949 } else if (host->retune_period) {
950 mmc_retune_timer_stop(host);
951 mmc_retune_needed(host);
954 mmc_release_host(host);
959 static int mmc_sdio_resume(struct mmc_host *host)
963 /* Basic card reinitialization. */
964 mmc_claim_host(host);
967 * Restore power and reinitialize the card when needed. Note that a
968 * removable card is checked from a detect work later on in the resume
971 if (!mmc_card_keep_power(host)) {
972 mmc_power_up(host, host->card->ocr);
974 * Tell runtime PM core we just powered up the card,
975 * since it still believes the card is powered off.
976 * Note that currently runtime PM is only enabled
977 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
979 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
980 pm_runtime_disable(&host->card->dev);
981 pm_runtime_set_active(&host->card->dev);
982 pm_runtime_enable(&host->card->dev);
984 err = mmc_sdio_reinit_card(host, 0);
985 } else if (mmc_card_wake_sdio_irq(host)) {
987 * We may have switched to 1-bit mode during suspend,
988 * need to hold retuning, because tuning only supprt
989 * 4-bit mode or 8 bit mode.
991 mmc_retune_hold_now(host);
992 err = sdio_enable_4bit_bus(host->card);
993 mmc_retune_release(host);
999 /* Allow SDIO IRQs to be processed again. */
1000 mmc_card_clr_suspended(host->card);
1002 if (host->sdio_irqs) {
1003 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1004 wake_up_process(host->sdio_irq_thread);
1005 else if (host->caps & MMC_CAP_SDIO_IRQ)
1006 host->ops->enable_sdio_irq(host, 1);
1010 mmc_release_host(host);
1012 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1016 static int mmc_sdio_power_restore(struct mmc_host *host)
1021 * Reset the card by performing the same steps that are taken by
1022 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1024 * sdio_reset() is technically not needed. Having just powered up the
1025 * hardware, it should already be in reset state. However, some
1026 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1027 * meaning that a reset is required when restoring power soon after
1028 * powering off. It is harmless in other cases.
1030 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1031 * is not necessary for non-removable cards. However, it is required
1032 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1033 * harmless in other situations.
1037 mmc_claim_host(host);
1039 ret = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
1040 if (!ret && host->sdio_irqs)
1041 mmc_signal_sdio_irq(host);
1043 mmc_release_host(host);
1048 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1050 /* No references to the card, cut the power to it. */
1051 mmc_claim_host(host);
1052 mmc_power_off(host);
1053 mmc_release_host(host);
1058 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1062 /* Restore power and re-initialize. */
1063 mmc_claim_host(host);
1064 mmc_power_up(host, host->card->ocr);
1065 ret = mmc_sdio_power_restore(host);
1066 mmc_release_host(host);
1071 static int mmc_sdio_hw_reset(struct mmc_host *host)
1073 mmc_power_cycle(host, host->card->ocr);
1074 return mmc_sdio_power_restore(host);
1077 static int mmc_sdio_sw_reset(struct mmc_host *host)
1079 mmc_set_clock(host, host->f_init);
1083 mmc_set_initial_state(host);
1084 mmc_set_initial_signal_voltage(host);
1086 return mmc_sdio_reinit_card(host, 0);
1089 static const struct mmc_bus_ops mmc_sdio_ops = {
1090 .remove = mmc_sdio_remove,
1091 .detect = mmc_sdio_detect,
1092 .pre_suspend = mmc_sdio_pre_suspend,
1093 .suspend = mmc_sdio_suspend,
1094 .resume = mmc_sdio_resume,
1095 .runtime_suspend = mmc_sdio_runtime_suspend,
1096 .runtime_resume = mmc_sdio_runtime_resume,
1097 .alive = mmc_sdio_alive,
1098 .hw_reset = mmc_sdio_hw_reset,
1099 .sw_reset = mmc_sdio_sw_reset,
1104 * Starting point for SDIO card init.
1106 int mmc_attach_sdio(struct mmc_host *host)
1110 struct mmc_card *card;
1112 WARN_ON(!host->claimed);
1114 err = mmc_send_io_op_cond(host, 0, &ocr);
1118 mmc_attach_bus(host, &mmc_sdio_ops);
1119 if (host->ocr_avail_sdio)
1120 host->ocr_avail = host->ocr_avail_sdio;
1123 rocr = mmc_select_voltage(host, ocr);
1126 * Can we support the voltage(s) of the card(s)?
1134 * Detect and init the card.
1136 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1143 * Enable runtime PM only if supported by host+card+board
1145 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1147 * Do not allow runtime suspend until after SDIO function
1148 * devices are added.
1150 pm_runtime_get_noresume(&card->dev);
1153 * Let runtime PM core know our card is active
1155 err = pm_runtime_set_active(&card->dev);
1160 * Enable runtime PM for this card
1162 pm_runtime_enable(&card->dev);
1166 * The number of functions on the card is encoded inside
1169 funcs = (ocr & 0x70000000) >> 28;
1170 card->sdio_funcs = 0;
1173 * Initialize (but don't add) all present functions.
1175 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1176 err = sdio_init_func(host->card, i + 1);
1181 * Enable Runtime PM for this func (if supported)
1183 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1184 pm_runtime_enable(&card->sdio_func[i]->dev);
1188 * First add the card to the driver model...
1190 mmc_release_host(host);
1191 err = mmc_add_card(host->card);
1196 * ...then the SDIO functions.
1198 for (i = 0;i < funcs;i++) {
1199 err = sdio_add_func(host->card->sdio_func[i]);
1204 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1205 pm_runtime_put(&card->dev);
1207 mmc_claim_host(host);
1212 mmc_release_host(host);
1215 * The devices are being deleted so it is not necessary to disable
1216 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1217 * because it needs to be active to remove any function devices that
1218 * were probed, and after that it gets deleted.
1220 mmc_sdio_remove(host);
1221 mmc_claim_host(host);
1223 mmc_detach_bus(host);
1225 pr_err("%s: error %d whilst initialising SDIO card\n",
1226 mmc_hostname(host), err);