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 (card->host->caps &
161 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
162 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
163 MMC_CAP_UHS_DDR50)) {
164 if (data & SDIO_UHS_DDR50)
165 card->sw_caps.sd3_bus_mode
166 |= SD_MODE_UHS_DDR50;
168 if (data & SDIO_UHS_SDR50)
169 card->sw_caps.sd3_bus_mode
170 |= SD_MODE_UHS_SDR50;
172 if (data & SDIO_UHS_SDR104)
173 card->sw_caps.sd3_bus_mode
174 |= SD_MODE_UHS_SDR104;
177 ret = mmc_io_rw_direct(card, 0, 0,
178 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
182 if (data & SDIO_DRIVE_SDTA)
183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
184 if (data & SDIO_DRIVE_SDTC)
185 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
186 if (data & SDIO_DRIVE_SDTD)
187 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
190 /* if no uhs mode ensure we check for high speed */
191 if (!card->sw_caps.sd3_bus_mode) {
192 if (speed & SDIO_SPEED_SHS) {
193 card->cccr.high_speed = 1;
194 card->sw_caps.hs_max_dtr = 50000000;
196 card->cccr.high_speed = 0;
197 card->sw_caps.hs_max_dtr = 25000000;
206 static int sdio_enable_wide(struct mmc_card *card)
211 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
214 if (card->cccr.low_speed && !card->cccr.wide_bus)
217 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
221 ctrl |= SDIO_BUS_WIDTH_4BIT;
223 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
231 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
232 * of the card. This may be required on certain setups of boards,
233 * controllers and embedded sdio device which do not need the card's
234 * pull-up. As a result, card detection is disabled and power is saved.
236 static int sdio_disable_cd(struct mmc_card *card)
241 if (!mmc_card_disable_cd(card))
244 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
248 ctrl |= SDIO_BUS_CD_DISABLE;
250 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
254 * Devices that remain active during a system suspend are
255 * put back into 1-bit mode.
257 static int sdio_disable_wide(struct mmc_card *card)
262 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
265 if (card->cccr.low_speed && !card->cccr.wide_bus)
268 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
272 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
275 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
276 ctrl |= SDIO_BUS_ASYNC_INT;
278 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
282 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
288 static int sdio_enable_4bit_bus(struct mmc_card *card)
292 if (card->type == MMC_TYPE_SDIO)
293 return sdio_enable_wide(card);
295 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
296 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
297 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
303 err = sdio_enable_wide(card);
305 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
312 * Test if the card supports high-speed mode and, if so, switch to it.
314 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
319 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
322 if (!card->cccr.high_speed)
325 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
330 speed |= SDIO_SPEED_EHS;
332 speed &= ~SDIO_SPEED_EHS;
334 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
342 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
344 static int sdio_enable_hs(struct mmc_card *card)
348 ret = mmc_sdio_switch_hs(card, true);
349 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
352 ret = mmc_sd_switch_hs(card);
354 mmc_sdio_switch_hs(card, false);
359 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
363 if (mmc_card_highspeed(card)) {
365 * The SDIO specification doesn't mention how
366 * the CIS transfer speed register relates to
367 * high-speed, but it seems that 50 MHz is
372 max_dtr = card->cis.max_dtr;
375 if (card->type == MMC_TYPE_SD_COMBO)
376 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
381 static unsigned char host_drive_to_sdio_drive(int host_strength)
383 switch (host_strength) {
384 case MMC_SET_DRIVER_TYPE_A:
385 return SDIO_DTSx_SET_TYPE_A;
386 case MMC_SET_DRIVER_TYPE_B:
387 return SDIO_DTSx_SET_TYPE_B;
388 case MMC_SET_DRIVER_TYPE_C:
389 return SDIO_DTSx_SET_TYPE_C;
390 case MMC_SET_DRIVER_TYPE_D:
391 return SDIO_DTSx_SET_TYPE_D;
393 return SDIO_DTSx_SET_TYPE_B;
397 static void sdio_select_driver_type(struct mmc_card *card)
399 int host_drv_type = SD_DRIVER_TYPE_B;
400 int card_drv_type = SD_DRIVER_TYPE_B;
402 unsigned char card_strength;
406 * If the host doesn't support any of the Driver Types A,C or D,
407 * or there is no board specific handler then default Driver
410 if (!(card->host->caps &
411 (MMC_CAP_DRIVER_TYPE_A |
412 MMC_CAP_DRIVER_TYPE_C |
413 MMC_CAP_DRIVER_TYPE_D)))
416 if (!card->host->ops->select_drive_strength)
419 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
420 host_drv_type |= SD_DRIVER_TYPE_A;
422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
423 host_drv_type |= SD_DRIVER_TYPE_C;
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
426 host_drv_type |= SD_DRIVER_TYPE_D;
428 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
429 card_drv_type |= SD_DRIVER_TYPE_A;
431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
432 card_drv_type |= SD_DRIVER_TYPE_C;
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
435 card_drv_type |= SD_DRIVER_TYPE_D;
438 * The drive strength that the hardware can support
439 * depends on the board design. Pass the appropriate
440 * information and let the hardware specific code
441 * return what is possible given the options
443 drive_strength = card->host->ops->select_drive_strength(
444 card->sw_caps.uhs_max_dtr,
445 host_drv_type, card_drv_type);
447 /* if error just use default for drive strength B */
448 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
453 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
454 card_strength |= host_drive_to_sdio_drive(drive_strength);
456 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
457 card_strength, NULL);
459 /* if error default to drive strength B */
461 mmc_set_driver_type(card->host, drive_strength);
465 static int sdio_set_bus_speed_mode(struct mmc_card *card)
467 unsigned int bus_speed, timing;
472 * If the host doesn't support any of the UHS-I modes, fallback on
475 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
476 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
479 bus_speed = SDIO_SPEED_SDR12;
480 timing = MMC_TIMING_UHS_SDR12;
481 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
482 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
483 bus_speed = SDIO_SPEED_SDR104;
484 timing = MMC_TIMING_UHS_SDR104;
485 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
486 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
487 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
488 bus_speed = SDIO_SPEED_DDR50;
489 timing = MMC_TIMING_UHS_DDR50;
490 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
492 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
493 SD_MODE_UHS_SDR50)) {
494 bus_speed = SDIO_SPEED_SDR50;
495 timing = MMC_TIMING_UHS_SDR50;
496 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
499 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
500 bus_speed = SDIO_SPEED_SDR25;
501 timing = MMC_TIMING_UHS_SDR25;
502 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
503 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
504 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
505 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
506 SD_MODE_UHS_SDR12)) {
507 bus_speed = SDIO_SPEED_SDR12;
508 timing = MMC_TIMING_UHS_SDR12;
509 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
512 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
516 speed &= ~SDIO_SPEED_BSS_MASK;
518 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
523 mmc_set_timing(card->host, timing);
524 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
531 * UHS-I specific initialization procedure
533 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
537 if (!card->scr.sda_spec3)
541 * Switch to wider bus (if supported).
543 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
544 err = sdio_enable_4bit_bus(card);
546 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
551 /* Set the driver strength for the card */
552 sdio_select_driver_type(card);
554 /* Set bus speed mode of the card */
555 err = sdio_set_bus_speed_mode(card);
559 /* Initialize and start re-tuning timer */
560 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
561 err = card->host->ops->execute_tuning(card->host,
562 MMC_SEND_TUNING_BLOCK);
570 * Handle the detection and initialisation of a card.
572 * In the case of a resume, "oldcard" will contain the card
573 * we're trying to reinitialise.
575 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
576 struct mmc_card *oldcard, int powered_resume)
578 struct mmc_card *card;
582 WARN_ON(!host->claimed);
585 * Inform the card of the voltage
587 if (!powered_resume) {
588 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
594 * For SPI, enable CRC as appropriate.
596 if (mmc_host_is_spi(host)) {
597 err = mmc_spi_set_crc(host, use_spi_crc);
603 * Allocate card structure.
605 card = mmc_alloc_card(host, NULL);
611 if ((ocr & R4_MEMORY_PRESENT) &&
612 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
613 card->type = MMC_TYPE_SD_COMBO;
615 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
616 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
617 mmc_remove_card(card);
621 card->type = MMC_TYPE_SDIO;
623 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
624 mmc_remove_card(card);
630 * Call the optional HC's init_card function to handle quirks.
632 if (host->ops->init_card)
633 host->ops->init_card(host, card);
636 * If the host and card support UHS-I mode request the card
637 * to switch to 1.8V signaling level. No 1.8v signalling if
638 * UHS mode is not enabled to maintain compatibilty and some
639 * systems that claim 1.8v signalling in fact do not support
642 if ((ocr & R4_18V_PRESENT) &&
644 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
645 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
646 MMC_CAP_UHS_DDR50))) {
647 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
650 ocr &= ~R4_18V_PRESENT;
651 host->ocr &= ~R4_18V_PRESENT;
655 ocr &= ~R4_18V_PRESENT;
656 host->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_card_set_highspeed(card);
707 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
714 * Read the common registers.
716 err = sdio_read_cccr(card, ocr);
721 * Read the common CIS tuples.
723 err = sdio_read_common_cis(card);
728 int same = (card->cis.vendor == oldcard->cis.vendor &&
729 card->cis.device == oldcard->cis.device);
730 mmc_remove_card(card);
736 mmc_fixup_device(card, NULL);
738 if (card->type == MMC_TYPE_SD_COMBO) {
739 err = mmc_sd_setup_card(host, card, oldcard != NULL);
740 /* handle as SDIO-only card if memory init failed */
743 if (mmc_host_is_spi(host))
744 /* should not fail, as it worked previously */
745 mmc_spi_set_crc(host, use_spi_crc);
746 card->type = MMC_TYPE_SDIO;
748 card->dev.type = &sd_type;
752 * If needed, disconnect card detection pull-up resistor.
754 err = sdio_disable_cd(card);
758 /* Initialization sequence for UHS-I cards */
759 /* Only if card supports 1.8v and UHS signaling */
760 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
761 err = mmc_sdio_init_uhs_card(card);
765 /* Card is an ultra-high-speed card */
766 mmc_card_set_uhs(card);
769 * Switch to high-speed (if supported).
771 err = sdio_enable_hs(card);
773 mmc_sd_go_highspeed(card);
778 * Change to the card's maximum speed.
780 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
783 * Switch to wider bus (if supported).
785 err = sdio_enable_4bit_bus(card);
787 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
798 mmc_remove_card(card);
805 * Host is being removed. Free up the current card.
807 static void mmc_sdio_remove(struct mmc_host *host)
814 for (i = 0;i < host->card->sdio_funcs;i++) {
815 if (host->card->sdio_func[i]) {
816 sdio_remove_func(host->card->sdio_func[i]);
817 host->card->sdio_func[i] = NULL;
821 mmc_remove_card(host->card);
826 * Card detection - card is alive.
828 static int mmc_sdio_alive(struct mmc_host *host)
830 return mmc_select_card(host->card);
834 * Card detection callback from host.
836 static void mmc_sdio_detect(struct mmc_host *host)
843 /* Make sure card is powered before detecting it */
844 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
845 err = pm_runtime_get_sync(&host->card->dev);
850 mmc_claim_host(host);
853 * Just check if our card has been removed.
855 err = _mmc_detect_card_removed(host);
857 mmc_release_host(host);
860 * Tell PM core it's OK to power off the card now.
862 * The _sync variant is used in order to ensure that the card
863 * is left powered off in case an error occurred, and the card
864 * is going to be removed.
866 * Since there is no specific reason to believe a new user
867 * is about to show up at this point, the _sync variant is
870 if (host->caps & MMC_CAP_POWER_OFF_CARD)
871 pm_runtime_put_sync(&host->card->dev);
875 mmc_sdio_remove(host);
877 mmc_claim_host(host);
878 mmc_detach_bus(host);
880 mmc_release_host(host);
885 * SDIO suspend. We need to suspend all functions separately.
886 * Therefore all registered functions must have drivers with suspend
887 * and resume methods. Failing that we simply remove the whole card.
889 static int mmc_sdio_suspend(struct mmc_host *host)
893 for (i = 0; i < host->card->sdio_funcs; i++) {
894 struct sdio_func *func = host->card->sdio_func[i];
895 if (func && sdio_func_present(func) && func->dev.driver) {
896 const struct dev_pm_ops *pmops = func->dev.driver->pm;
897 if (!pmops || !pmops->suspend || !pmops->resume) {
898 /* force removal of entire card in that case */
901 err = pmops->suspend(&func->dev);
906 while (err && --i >= 0) {
907 struct sdio_func *func = host->card->sdio_func[i];
908 if (func && sdio_func_present(func) && func->dev.driver) {
909 const struct dev_pm_ops *pmops = func->dev.driver->pm;
910 pmops->resume(&func->dev);
914 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
915 mmc_claim_host(host);
916 sdio_disable_wide(host->card);
917 mmc_release_host(host);
923 static int mmc_sdio_resume(struct mmc_host *host)
930 /* Basic card reinitialization. */
931 mmc_claim_host(host);
933 /* No need to reinitialize powered-resumed nonremovable cards */
934 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
935 err = mmc_sdio_init_card(host, host->ocr, host->card,
936 mmc_card_keep_power(host));
937 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
938 /* We may have switched to 1-bit mode during suspend */
939 err = sdio_enable_4bit_bus(host->card);
941 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
946 if (!err && host->sdio_irqs)
947 mmc_signal_sdio_irq(host);
948 mmc_release_host(host);
951 * If the card looked to be the same as before suspending, then
952 * we proceed to resume all card functions. If one of them returns
953 * an error then we simply return that error to the core and the
954 * card will be redetected as new. It is the responsibility of
955 * the function driver to perform further tests with the extra
956 * knowledge it has of the card to confirm the card is indeed the
957 * same as before suspending (same MAC address for network cards,
958 * etc.) and return an error otherwise.
960 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
961 struct sdio_func *func = host->card->sdio_func[i];
962 if (func && sdio_func_present(func) && func->dev.driver) {
963 const struct dev_pm_ops *pmops = func->dev.driver->pm;
964 err = pmops->resume(&func->dev);
971 static int mmc_sdio_power_restore(struct mmc_host *host)
979 mmc_claim_host(host);
982 * Reset the card by performing the same steps that are taken by
983 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
985 * sdio_reset() is technically not needed. Having just powered up the
986 * hardware, it should already be in reset state. However, some
987 * platforms (such as SD8686 on OLPC) do not instantly cut power,
988 * meaning that a reset is required when restoring power soon after
989 * powering off. It is harmless in other cases.
991 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
992 * is not necessary for non-removable cards. However, it is required
993 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
994 * harmless in other situations.
996 * With these steps taken, mmc_select_voltage() is also required to
997 * restore the correct voltage setting of the card.
1001 mmc_send_if_cond(host, host->ocr_avail);
1003 ret = mmc_send_io_op_cond(host, 0, &ocr);
1007 if (host->ocr_avail_sdio)
1008 host->ocr_avail = host->ocr_avail_sdio;
1010 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1016 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1017 mmc_card_keep_power(host));
1018 if (!ret && host->sdio_irqs)
1019 mmc_signal_sdio_irq(host);
1022 mmc_release_host(host);
1027 static const struct mmc_bus_ops mmc_sdio_ops = {
1028 .remove = mmc_sdio_remove,
1029 .detect = mmc_sdio_detect,
1030 .suspend = mmc_sdio_suspend,
1031 .resume = mmc_sdio_resume,
1032 .power_restore = mmc_sdio_power_restore,
1033 .alive = mmc_sdio_alive,
1038 * Starting point for SDIO card init.
1040 int mmc_attach_sdio(struct mmc_host *host)
1044 struct mmc_card *card;
1047 WARN_ON(!host->claimed);
1049 err = mmc_send_io_op_cond(host, 0, &ocr);
1053 mmc_attach_bus(host, &mmc_sdio_ops);
1054 if (host->ocr_avail_sdio)
1055 host->ocr_avail = host->ocr_avail_sdio;
1058 * Sanity check the voltages that the card claims to
1062 pr_warning("%s: card claims to support voltages "
1063 "below the defined range. These will be ignored.\n",
1064 mmc_hostname(host));
1068 host->ocr = mmc_select_voltage(host, ocr);
1071 * Can we support the voltage(s) of the card(s)?
1079 * Detect and init the card.
1081 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1083 if (err == -EAGAIN) {
1085 * Retry initialization with S18R set to 0.
1087 host->ocr &= ~R4_18V_PRESENT;
1088 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096 * Enable runtime PM only if supported by host+card+board
1098 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1100 * Let runtime PM core know our card is active
1102 err = pm_runtime_set_active(&card->dev);
1107 * Enable runtime PM for this card
1109 pm_runtime_enable(&card->dev);
1113 * The number of functions on the card is encoded inside
1116 funcs = (ocr & 0x70000000) >> 28;
1117 card->sdio_funcs = 0;
1120 * Initialize (but don't add) all present functions.
1122 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1123 err = sdio_init_func(host->card, i + 1);
1128 * Enable Runtime PM for this func (if supported)
1130 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1131 pm_runtime_enable(&card->sdio_func[i]->dev);
1135 * First add the card to the driver model...
1137 mmc_release_host(host);
1138 err = mmc_add_card(host->card);
1143 * ...then the SDIO functions.
1145 for (i = 0;i < funcs;i++) {
1146 err = sdio_add_func(host->card->sdio_func[i]);
1151 mmc_claim_host(host);
1156 /* Remove without lock if the device has been added. */
1157 mmc_sdio_remove(host);
1158 mmc_claim_host(host);
1160 /* And with lock if it hasn't been added. */
1161 mmc_release_host(host);
1163 mmc_sdio_remove(host);
1164 mmc_claim_host(host);
1166 mmc_detach_bus(host);
1168 pr_err("%s: error %d whilst initialising SDIO card\n",
1169 mmc_hostname(host), err);