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);
566 /* Initialize and start re-tuning timer */
567 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
568 err = card->host->ops->execute_tuning(card->host,
569 MMC_SEND_TUNING_BLOCK);
577 * Handle the detection and initialisation of a card.
579 * In the case of a resume, "oldcard" will contain the card
580 * we're trying to reinitialise.
582 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
583 struct mmc_card *oldcard, int powered_resume)
585 struct mmc_card *card;
590 WARN_ON(!host->claimed);
594 pr_warning("%s: Skipping voltage switch\n",
596 ocr &= ~R4_18V_PRESENT;
597 host->ocr &= ~R4_18V_PRESENT;
601 * Inform the card of the voltage
603 if (!powered_resume) {
604 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
610 * For SPI, enable CRC as appropriate.
612 if (mmc_host_is_spi(host)) {
613 err = mmc_spi_set_crc(host, use_spi_crc);
619 * Allocate card structure.
621 card = mmc_alloc_card(host, NULL);
627 if ((ocr & R4_MEMORY_PRESENT) &&
628 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
629 card->type = MMC_TYPE_SD_COMBO;
631 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
632 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
633 mmc_remove_card(card);
637 card->type = MMC_TYPE_SDIO;
639 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
640 mmc_remove_card(card);
646 * Call the optional HC's init_card function to handle quirks.
648 if (host->ops->init_card)
649 host->ops->init_card(host, card);
652 * If the host and card support UHS-I mode request the card
653 * to switch to 1.8V signaling level. No 1.8v signalling if
654 * UHS mode is not enabled to maintain compatibility and some
655 * systems that claim 1.8v signalling in fact do not support
658 if (!powered_resume && (ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {
659 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
660 if (err == -EAGAIN) {
663 mmc_send_if_cond(host, host->ocr_avail);
664 mmc_remove_card(card);
668 ocr &= ~R4_18V_PRESENT;
669 host->ocr &= ~R4_18V_PRESENT;
673 ocr &= ~R4_18V_PRESENT;
674 host->ocr &= ~R4_18V_PRESENT;
678 * For native busses: set card RCA and quit open drain mode.
680 if (!powered_resume && !mmc_host_is_spi(host)) {
681 err = mmc_send_relative_addr(host, &card->rca);
686 * Update oldcard with the new RCA received from the SDIO
687 * device -- we're doing this so that it's updated in the
688 * "card" struct when oldcard overwrites that later.
691 oldcard->rca = card->rca;
695 * Read CSD, before selecting the card
697 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
698 err = mmc_sd_get_csd(host, card);
702 mmc_decode_cid(card);
706 * Select card, as all following commands rely on that.
708 if (!powered_resume && !mmc_host_is_spi(host)) {
709 err = mmc_select_card(card);
714 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
716 * This is non-standard SDIO device, meaning it doesn't
717 * have any CIA (Common I/O area) registers present.
718 * It's host's responsibility to fill cccr and cis
719 * structures in init_card().
721 mmc_set_clock(host, card->cis.max_dtr);
723 if (card->cccr.high_speed) {
724 mmc_card_set_highspeed(card);
725 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
732 * Read the common registers.
734 err = sdio_read_cccr(card, ocr);
739 * Read the common CIS tuples.
741 err = sdio_read_common_cis(card);
746 int same = (card->cis.vendor == oldcard->cis.vendor &&
747 card->cis.device == oldcard->cis.device);
748 mmc_remove_card(card);
754 mmc_fixup_device(card, NULL);
756 if (card->type == MMC_TYPE_SD_COMBO) {
757 err = mmc_sd_setup_card(host, card, oldcard != NULL);
758 /* handle as SDIO-only card if memory init failed */
761 if (mmc_host_is_spi(host))
762 /* should not fail, as it worked previously */
763 mmc_spi_set_crc(host, use_spi_crc);
764 card->type = MMC_TYPE_SDIO;
766 card->dev.type = &sd_type;
770 * If needed, disconnect card detection pull-up resistor.
772 err = sdio_disable_cd(card);
776 /* Initialization sequence for UHS-I cards */
777 /* Only if card supports 1.8v and UHS signaling */
778 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
779 err = mmc_sdio_init_uhs_card(card);
783 /* Card is an ultra-high-speed card */
784 mmc_card_set_uhs(card);
787 * Switch to high-speed (if supported).
789 err = sdio_enable_hs(card);
791 mmc_sd_go_highspeed(card);
796 * Change to the card's maximum speed.
798 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
801 * Switch to wider bus (if supported).
803 err = sdio_enable_4bit_bus(card);
805 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
816 mmc_remove_card(card);
823 * Host is being removed. Free up the current card.
825 static void mmc_sdio_remove(struct mmc_host *host)
832 for (i = 0;i < host->card->sdio_funcs;i++) {
833 if (host->card->sdio_func[i]) {
834 sdio_remove_func(host->card->sdio_func[i]);
835 host->card->sdio_func[i] = NULL;
839 mmc_remove_card(host->card);
844 * Card detection - card is alive.
846 static int mmc_sdio_alive(struct mmc_host *host)
848 return mmc_select_card(host->card);
852 * Card detection callback from host.
854 static void mmc_sdio_detect(struct mmc_host *host)
861 /* Make sure card is powered before detecting it */
862 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
863 err = pm_runtime_get_sync(&host->card->dev);
865 pm_runtime_put_noidle(&host->card->dev);
870 mmc_claim_host(host);
873 * Just check if our card has been removed.
875 err = _mmc_detect_card_removed(host);
877 mmc_release_host(host);
880 * Tell PM core it's OK to power off the card now.
882 * The _sync variant is used in order to ensure that the card
883 * is left powered off in case an error occurred, and the card
884 * is going to be removed.
886 * Since there is no specific reason to believe a new user
887 * is about to show up at this point, the _sync variant is
890 if (host->caps & MMC_CAP_POWER_OFF_CARD)
891 pm_runtime_put_sync(&host->card->dev);
895 mmc_sdio_remove(host);
897 mmc_claim_host(host);
898 mmc_detach_bus(host);
900 mmc_release_host(host);
905 * SDIO suspend. We need to suspend all functions separately.
906 * Therefore all registered functions must have drivers with suspend
907 * and resume methods. Failing that we simply remove the whole card.
909 static int mmc_sdio_suspend(struct mmc_host *host)
913 for (i = 0; i < host->card->sdio_funcs; i++) {
914 struct sdio_func *func = host->card->sdio_func[i];
915 if (func && sdio_func_present(func) && func->dev.driver) {
916 const struct dev_pm_ops *pmops = func->dev.driver->pm;
917 if (!pmops || !pmops->suspend || !pmops->resume) {
918 /* force removal of entire card in that case */
921 err = pmops->suspend(&func->dev);
926 while (err && --i >= 0) {
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 pmops->resume(&func->dev);
934 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
935 mmc_claim_host(host);
936 sdio_disable_wide(host->card);
937 mmc_release_host(host);
943 static int mmc_sdio_resume(struct mmc_host *host)
950 /* Basic card reinitialization. */
951 mmc_claim_host(host);
953 /* No need to reinitialize powered-resumed nonremovable cards */
954 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
957 err = mmc_sdio_init_card(host, host->ocr, host->card,
958 mmc_card_keep_power(host));
959 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
960 /* We may have switched to 1-bit mode during suspend */
961 err = sdio_enable_4bit_bus(host->card);
963 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
968 if (!err && host->sdio_irqs)
969 wake_up_process(host->sdio_irq_thread);
970 mmc_release_host(host);
973 * If the card looked to be the same as before suspending, then
974 * we proceed to resume all card functions. If one of them returns
975 * an error then we simply return that error to the core and the
976 * card will be redetected as new. It is the responsibility of
977 * the function driver to perform further tests with the extra
978 * knowledge it has of the card to confirm the card is indeed the
979 * same as before suspending (same MAC address for network cards,
980 * etc.) and return an error otherwise.
982 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
983 struct sdio_func *func = host->card->sdio_func[i];
984 if (func && sdio_func_present(func) && func->dev.driver) {
985 const struct dev_pm_ops *pmops = func->dev.driver->pm;
986 err = pmops->resume(&func->dev);
993 static int mmc_sdio_power_restore(struct mmc_host *host)
1001 mmc_claim_host(host);
1004 * Reset the card by performing the same steps that are taken by
1005 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1007 * sdio_reset() is technically not needed. Having just powered up the
1008 * hardware, it should already be in reset state. However, some
1009 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1010 * meaning that a reset is required when restoring power soon after
1011 * powering off. It is harmless in other cases.
1013 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1014 * is not necessary for non-removable cards. However, it is required
1015 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1016 * harmless in other situations.
1018 * With these steps taken, mmc_select_voltage() is also required to
1019 * restore the correct voltage setting of the card.
1024 mmc_send_if_cond(host, host->ocr_avail);
1026 ret = mmc_send_io_op_cond(host, 0, &ocr);
1030 if (host->ocr_avail_sdio)
1031 host->ocr_avail = host->ocr_avail_sdio;
1033 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1039 if (mmc_host_uhs(host))
1040 /* to query card if 1.8V signalling is supported */
1041 host->ocr |= R4_18V_PRESENT;
1043 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1044 mmc_card_keep_power(host));
1045 if (!ret && host->sdio_irqs)
1046 mmc_signal_sdio_irq(host);
1049 mmc_release_host(host);
1054 static const struct mmc_bus_ops mmc_sdio_ops = {
1055 .remove = mmc_sdio_remove,
1056 .detect = mmc_sdio_detect,
1057 .suspend = mmc_sdio_suspend,
1058 .resume = mmc_sdio_resume,
1059 .power_restore = mmc_sdio_power_restore,
1060 .alive = mmc_sdio_alive,
1065 * Starting point for SDIO card init.
1067 int mmc_attach_sdio(struct mmc_host *host)
1071 struct mmc_card *card;
1074 WARN_ON(!host->claimed);
1076 err = mmc_send_io_op_cond(host, 0, &ocr);
1080 mmc_attach_bus(host, &mmc_sdio_ops);
1081 if (host->ocr_avail_sdio)
1082 host->ocr_avail = host->ocr_avail_sdio;
1085 * Sanity check the voltages that the card claims to
1089 pr_warning("%s: card claims to support voltages "
1090 "below the defined range. These will be ignored.\n",
1091 mmc_hostname(host));
1095 host->ocr = mmc_select_voltage(host, ocr);
1098 * Can we support the voltage(s) of the card(s)?
1106 * Detect and init the card.
1108 if (mmc_host_uhs(host))
1109 /* to query card if 1.8V signalling is supported */
1110 host->ocr |= R4_18V_PRESENT;
1112 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1114 if (err == -EAGAIN) {
1116 * Retry initialization with S18R set to 0.
1118 host->ocr &= ~R4_18V_PRESENT;
1119 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1127 * Enable runtime PM only if supported by host+card+board
1129 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1131 * Let runtime PM core know our card is active
1133 err = pm_runtime_set_active(&card->dev);
1138 * Enable runtime PM for this card
1140 pm_runtime_enable(&card->dev);
1144 * The number of functions on the card is encoded inside
1147 funcs = (ocr & 0x70000000) >> 28;
1148 card->sdio_funcs = 0;
1151 * Initialize (but don't add) all present functions.
1153 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1154 err = sdio_init_func(host->card, i + 1);
1159 * Enable Runtime PM for this func (if supported)
1161 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1162 pm_runtime_enable(&card->sdio_func[i]->dev);
1166 * First add the card to the driver model...
1168 mmc_release_host(host);
1169 err = mmc_add_card(host->card);
1174 * ...then the SDIO functions.
1176 for (i = 0;i < funcs;i++) {
1177 err = sdio_add_func(host->card->sdio_func[i]);
1182 mmc_claim_host(host);
1187 /* Remove without lock if the device has been added. */
1188 mmc_sdio_remove(host);
1189 mmc_claim_host(host);
1191 /* And with lock if it hasn't been added. */
1192 mmc_release_host(host);
1194 mmc_sdio_remove(host);
1195 mmc_claim_host(host);
1197 mmc_detach_bus(host);
1199 pr_err("%s: error %d whilst initialising SDIO card\n",
1200 mmc_hostname(host), err);