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;
449 * If the host doesn't support any of the UHS-I modes, fallback on
452 if (!mmc_host_uhs(card->host))
455 bus_speed = SDIO_SPEED_SDR12;
456 timing = MMC_TIMING_UHS_SDR12;
457 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
458 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
459 bus_speed = SDIO_SPEED_SDR104;
460 timing = MMC_TIMING_UHS_SDR104;
461 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
462 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
463 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
465 bus_speed = SDIO_SPEED_DDR50;
466 timing = MMC_TIMING_UHS_DDR50;
467 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
468 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
470 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
471 SD_MODE_UHS_SDR50)) {
472 bus_speed = SDIO_SPEED_SDR50;
473 timing = MMC_TIMING_UHS_SDR50;
474 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
475 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
478 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
479 bus_speed = SDIO_SPEED_SDR25;
480 timing = MMC_TIMING_UHS_SDR25;
481 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
482 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
483 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
484 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
485 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
486 SD_MODE_UHS_SDR12)) {
487 bus_speed = SDIO_SPEED_SDR12;
488 timing = MMC_TIMING_UHS_SDR12;
489 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
490 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
493 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
497 speed &= ~SDIO_SPEED_BSS_MASK;
499 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
504 mmc_set_timing(card->host, timing);
505 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
512 * UHS-I specific initialization procedure
514 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
518 if (!card->scr.sda_spec3)
522 * Switch to wider bus (if supported).
524 if (card->host->caps & MMC_CAP_4_BIT_DATA)
525 err = sdio_enable_4bit_bus(card);
527 /* Set the driver strength for the card */
528 sdio_select_driver_type(card);
530 /* Set bus speed mode of the card */
531 err = sdio_set_bus_speed_mode(card);
536 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
537 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
539 if (!mmc_host_is_spi(card->host) &&
540 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
541 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
542 err = mmc_execute_tuning(card);
547 static void mmc_sdio_resend_if_cond(struct mmc_host *host,
548 struct mmc_card *card)
552 mmc_send_if_cond(host, host->ocr_avail);
553 mmc_remove_card(card);
557 * Handle the detection and initialisation of a card.
559 * In the case of a resume, "oldcard" will contain the card
560 * we're trying to reinitialise.
562 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
563 struct mmc_card *oldcard, int powered_resume)
565 struct mmc_card *card;
571 WARN_ON(!host->claimed);
573 /* to query card if 1.8V signalling is supported */
574 if (mmc_host_uhs(host))
575 ocr |= R4_18V_PRESENT;
579 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
580 ocr &= ~R4_18V_PRESENT;
584 * Inform the card of the voltage
586 if (!powered_resume) {
587 err = mmc_send_io_op_cond(host, ocr, &rocr);
593 * For SPI, enable CRC as appropriate.
595 if (mmc_host_is_spi(host)) {
596 err = mmc_spi_set_crc(host, use_spi_crc);
602 * Allocate card structure.
604 card = mmc_alloc_card(host, NULL);
610 if ((rocr & R4_MEMORY_PRESENT) &&
611 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
612 card->type = MMC_TYPE_SD_COMBO;
614 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
615 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
616 mmc_remove_card(card);
620 card->type = MMC_TYPE_SDIO;
622 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
623 mmc_remove_card(card);
629 * Call the optional HC's init_card function to handle quirks.
631 if (host->ops->init_card)
632 host->ops->init_card(host, card);
634 card->ocr = ocr_card;
637 * If the host and card support UHS-I mode request the card
638 * to switch to 1.8V signaling level. No 1.8v signalling if
639 * UHS mode is not enabled to maintain compatibility and some
640 * systems that claim 1.8v signalling in fact do not support
641 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
642 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
643 * fails to check rocr & R4_18V_PRESENT, but we still need to
644 * try to init uhs card. sdio_read_cccr will take over this task
645 * to make sure which speed mode should work.
647 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
648 err = mmc_set_uhs_voltage(host, ocr_card);
649 if (err == -EAGAIN) {
650 mmc_sdio_resend_if_cond(host, card);
654 ocr &= ~R4_18V_PRESENT;
659 * For native busses: set card RCA and quit open drain mode.
661 if (!powered_resume && !mmc_host_is_spi(host)) {
662 err = mmc_send_relative_addr(host, &card->rca);
667 * Update oldcard with the new RCA received from the SDIO
668 * device -- we're doing this so that it's updated in the
669 * "card" struct when oldcard overwrites that later.
672 oldcard->rca = card->rca;
676 * Read CSD, before selecting the card
678 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
679 err = mmc_sd_get_csd(host, card);
683 mmc_decode_cid(card);
687 * Select card, as all following commands rely on that.
689 if (!powered_resume && !mmc_host_is_spi(host)) {
690 err = mmc_select_card(card);
695 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
697 * This is non-standard SDIO device, meaning it doesn't
698 * have any CIA (Common I/O area) registers present.
699 * It's host's responsibility to fill cccr and cis
700 * structures in init_card().
702 mmc_set_clock(host, card->cis.max_dtr);
704 if (card->cccr.high_speed) {
705 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
712 * Read the common registers. Note that we should try to
713 * validate whether UHS would work or not.
715 err = sdio_read_cccr(card, ocr);
717 mmc_sdio_resend_if_cond(host, card);
718 if (ocr & R4_18V_PRESENT) {
719 /* Retry init sequence, but without R4_18V_PRESENT. */
727 * Read the common CIS tuples.
729 err = sdio_read_common_cis(card);
734 int same = (card->cis.vendor == oldcard->cis.vendor &&
735 card->cis.device == oldcard->cis.device);
736 mmc_remove_card(card);
743 mmc_fixup_device(card, sdio_fixup_methods);
745 if (card->type == MMC_TYPE_SD_COMBO) {
746 err = mmc_sd_setup_card(host, card, oldcard != NULL);
747 /* handle as SDIO-only card if memory init failed */
750 if (mmc_host_is_spi(host))
751 /* should not fail, as it worked previously */
752 mmc_spi_set_crc(host, use_spi_crc);
753 card->type = MMC_TYPE_SDIO;
755 card->dev.type = &sd_type;
759 * If needed, disconnect card detection pull-up resistor.
761 err = sdio_disable_cd(card);
765 /* Initialization sequence for UHS-I cards */
766 /* Only if card supports 1.8v and UHS signaling */
767 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
768 err = mmc_sdio_init_uhs_card(card);
773 * Switch to high-speed (if supported).
775 err = sdio_enable_hs(card);
777 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
782 * Change to the card's maximum speed.
784 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
787 * Switch to wider bus (if supported).
789 err = sdio_enable_4bit_bus(card);
800 mmc_remove_card(card);
807 * Host is being removed. Free up the current card.
809 static void mmc_sdio_remove(struct mmc_host *host)
813 for (i = 0;i < host->card->sdio_funcs;i++) {
814 if (host->card->sdio_func[i]) {
815 sdio_remove_func(host->card->sdio_func[i]);
816 host->card->sdio_func[i] = NULL;
820 mmc_remove_card(host->card);
825 * Card detection - card is alive.
827 static int mmc_sdio_alive(struct mmc_host *host)
829 return mmc_select_card(host->card);
833 * Card detection callback from host.
835 static void mmc_sdio_detect(struct mmc_host *host)
839 /* Make sure card is powered before detecting it */
840 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
841 err = pm_runtime_get_sync(&host->card->dev);
843 pm_runtime_put_noidle(&host->card->dev);
848 mmc_claim_host(host);
851 * Just check if our card has been removed.
853 err = _mmc_detect_card_removed(host);
855 mmc_release_host(host);
858 * Tell PM core it's OK to power off the card now.
860 * The _sync variant is used in order to ensure that the card
861 * is left powered off in case an error occurred, and the card
862 * is going to be removed.
864 * Since there is no specific reason to believe a new user
865 * is about to show up at this point, the _sync variant is
868 if (host->caps & MMC_CAP_POWER_OFF_CARD)
869 pm_runtime_put_sync(&host->card->dev);
873 mmc_sdio_remove(host);
875 mmc_claim_host(host);
876 mmc_detach_bus(host);
878 mmc_release_host(host);
883 * SDIO pre_suspend. We need to suspend all functions separately.
884 * Therefore all registered functions must have drivers with suspend
885 * and resume methods. Failing that we simply remove the whole card.
887 static int mmc_sdio_pre_suspend(struct mmc_host *host)
891 for (i = 0; i < host->card->sdio_funcs; i++) {
892 struct sdio_func *func = host->card->sdio_func[i];
893 if (func && sdio_func_present(func) && func->dev.driver) {
894 const struct dev_pm_ops *pmops = func->dev.driver->pm;
895 if (!pmops || !pmops->suspend || !pmops->resume) {
896 /* force removal of entire card in that case */
907 * SDIO suspend. Suspend all functions separately.
909 static int mmc_sdio_suspend(struct mmc_host *host)
911 /* Prevent processing of SDIO IRQs in suspended state. */
912 mmc_card_set_suspended(host->card);
913 cancel_delayed_work_sync(&host->sdio_irq_work);
915 mmc_claim_host(host);
917 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
918 sdio_disable_wide(host->card);
920 if (!mmc_card_keep_power(host)) {
922 } else if (host->retune_period) {
923 mmc_retune_timer_stop(host);
924 mmc_retune_needed(host);
927 mmc_release_host(host);
932 static int mmc_sdio_resume(struct mmc_host *host)
936 /* Basic card reinitialization. */
937 mmc_claim_host(host);
939 /* Restore power if needed */
940 if (!mmc_card_keep_power(host)) {
941 mmc_power_up(host, host->card->ocr);
943 * Tell runtime PM core we just powered up the card,
944 * since it still believes the card is powered off.
945 * Note that currently runtime PM is only enabled
946 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
948 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
949 pm_runtime_disable(&host->card->dev);
950 pm_runtime_set_active(&host->card->dev);
951 pm_runtime_enable(&host->card->dev);
955 /* No need to reinitialize powered-resumed nonremovable cards */
956 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
959 mmc_send_if_cond(host, host->card->ocr);
960 err = mmc_send_io_op_cond(host, 0, NULL);
962 err = mmc_sdio_init_card(host, host->card->ocr,
964 mmc_card_keep_power(host));
965 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
966 /* We may have switched to 1-bit mode during suspend */
967 err = sdio_enable_4bit_bus(host->card);
973 /* Allow SDIO IRQs to be processed again. */
974 mmc_card_clr_suspended(host->card);
976 if (host->sdio_irqs) {
977 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
978 wake_up_process(host->sdio_irq_thread);
979 else if (host->caps & MMC_CAP_SDIO_IRQ)
980 host->ops->enable_sdio_irq(host, 1);
984 mmc_release_host(host);
986 host->pm_flags &= ~MMC_PM_KEEP_POWER;
990 static int mmc_sdio_power_restore(struct mmc_host *host)
994 mmc_claim_host(host);
997 * Reset the card by performing the same steps that are taken by
998 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1000 * sdio_reset() is technically not needed. Having just powered up the
1001 * hardware, it should already be in reset state. However, some
1002 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1003 * meaning that a reset is required when restoring power soon after
1004 * powering off. It is harmless in other cases.
1006 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1007 * is not necessary for non-removable cards. However, it is required
1008 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1009 * harmless in other situations.
1015 mmc_send_if_cond(host, host->card->ocr);
1017 ret = mmc_send_io_op_cond(host, 0, NULL);
1021 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1022 mmc_card_keep_power(host));
1023 if (!ret && host->sdio_irqs)
1024 mmc_signal_sdio_irq(host);
1027 mmc_release_host(host);
1032 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1034 /* No references to the card, cut the power to it. */
1035 mmc_claim_host(host);
1036 mmc_power_off(host);
1037 mmc_release_host(host);
1042 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1046 /* Restore power and re-initialize. */
1047 mmc_claim_host(host);
1048 mmc_power_up(host, host->card->ocr);
1049 ret = mmc_sdio_power_restore(host);
1050 mmc_release_host(host);
1055 static int mmc_sdio_reset(struct mmc_host *host)
1057 mmc_power_cycle(host, host->card->ocr);
1058 return mmc_sdio_power_restore(host);
1061 static const struct mmc_bus_ops mmc_sdio_ops = {
1062 .remove = mmc_sdio_remove,
1063 .detect = mmc_sdio_detect,
1064 .pre_suspend = mmc_sdio_pre_suspend,
1065 .suspend = mmc_sdio_suspend,
1066 .resume = mmc_sdio_resume,
1067 .runtime_suspend = mmc_sdio_runtime_suspend,
1068 .runtime_resume = mmc_sdio_runtime_resume,
1069 .power_restore = mmc_sdio_power_restore,
1070 .alive = mmc_sdio_alive,
1071 .reset = mmc_sdio_reset,
1076 * Starting point for SDIO card init.
1078 int mmc_attach_sdio(struct mmc_host *host)
1082 struct mmc_card *card;
1084 WARN_ON(!host->claimed);
1086 err = mmc_send_io_op_cond(host, 0, &ocr);
1090 mmc_attach_bus(host, &mmc_sdio_ops);
1091 if (host->ocr_avail_sdio)
1092 host->ocr_avail = host->ocr_avail_sdio;
1095 rocr = mmc_select_voltage(host, ocr);
1098 * Can we support the voltage(s) of the card(s)?
1106 * Detect and init the card.
1108 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1115 * Enable runtime PM only if supported by host+card+board
1117 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1119 * Do not allow runtime suspend until after SDIO function
1120 * devices are added.
1122 pm_runtime_get_noresume(&card->dev);
1125 * Let runtime PM core know our card is active
1127 err = pm_runtime_set_active(&card->dev);
1132 * Enable runtime PM for this card
1134 pm_runtime_enable(&card->dev);
1138 * The number of functions on the card is encoded inside
1141 funcs = (ocr & 0x70000000) >> 28;
1142 card->sdio_funcs = 0;
1145 * Initialize (but don't add) all present functions.
1147 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1148 err = sdio_init_func(host->card, i + 1);
1153 * Enable Runtime PM for this func (if supported)
1155 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1156 pm_runtime_enable(&card->sdio_func[i]->dev);
1160 * First add the card to the driver model...
1162 mmc_release_host(host);
1163 err = mmc_add_card(host->card);
1168 * ...then the SDIO functions.
1170 for (i = 0;i < funcs;i++) {
1171 err = sdio_add_func(host->card->sdio_func[i]);
1176 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1177 pm_runtime_put(&card->dev);
1179 mmc_claim_host(host);
1184 mmc_release_host(host);
1187 * The devices are being deleted so it is not necessary to disable
1188 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1189 * because it needs to be active to remove any function devices that
1190 * were probed, and after that it gets deleted.
1192 mmc_sdio_remove(host);
1193 mmc_claim_host(host);
1195 mmc_detach_bus(host);
1197 pr_err("%s: error %d whilst initialising SDIO card\n",
1198 mmc_hostname(host), err);