1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/drivers/mmc/sdio.c
5 * Copyright 2006-2007 Pierre Ossman
9 #include <linux/pm_runtime.h>
11 #include <linux/mmc/host.h>
12 #include <linux/mmc/card.h>
13 #include <linux/mmc/mmc.h>
14 #include <linux/mmc/sdio.h>
15 #include <linux/mmc/sdio_func.h>
16 #include <linux/mmc/sdio_ids.h>
30 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
31 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
32 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
33 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
35 static struct attribute *sdio_std_attrs[] = {
36 &dev_attr_vendor.attr,
37 &dev_attr_device.attr,
42 ATTRIBUTE_GROUPS(sdio_std);
44 static struct device_type sdio_type = {
45 .groups = sdio_std_groups,
48 static int sdio_read_fbr(struct sdio_func *func)
53 if (mmc_card_nonstd_func_interface(func->card)) {
54 func->class = SDIO_CLASS_NONE;
58 ret = mmc_io_rw_direct(func->card, 0, 0,
59 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
66 ret = mmc_io_rw_direct(func->card, 0, 0,
67 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
78 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
81 struct sdio_func *func;
83 if (WARN_ON(fn > SDIO_MAX_FUNCS))
86 func = sdio_alloc_func(card);
92 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
93 ret = sdio_read_fbr(func);
97 ret = sdio_read_func_cis(func);
101 func->vendor = func->card->cis.vendor;
102 func->device = func->card->cis.device;
103 func->max_blksize = func->card->cis.blksize;
106 card->sdio_func[fn - 1] = func;
112 * It is okay to remove the function here even though we hold
113 * the host lock as we haven't registered the device yet.
115 sdio_remove_func(func);
119 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
123 int uhs = ocr & R4_18V_PRESENT;
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
131 cccr_vsn = data & 0x0f;
133 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
134 pr_err("%s: unrecognised CCCR structure version %d\n",
135 mmc_hostname(card->host), cccr_vsn);
139 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
141 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
145 if (data & SDIO_CCCR_CAP_SMB)
146 card->cccr.multi_block = 1;
147 if (data & SDIO_CCCR_CAP_LSC)
148 card->cccr.low_speed = 1;
149 if (data & SDIO_CCCR_CAP_4BLS)
150 card->cccr.wide_bus = 1;
152 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
153 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
157 if (data & SDIO_POWER_SMPC)
158 card->cccr.high_power = 1;
161 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
162 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
166 card->scr.sda_spec3 = 0;
167 card->sw_caps.sd3_bus_mode = 0;
168 card->sw_caps.sd3_drv_type = 0;
169 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
170 card->scr.sda_spec3 = 1;
171 ret = mmc_io_rw_direct(card, 0, 0,
172 SDIO_CCCR_UHS, 0, &data);
176 if (mmc_host_uhs(card->host)) {
177 if (data & SDIO_UHS_DDR50)
178 card->sw_caps.sd3_bus_mode
179 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
180 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
182 if (data & SDIO_UHS_SDR50)
183 card->sw_caps.sd3_bus_mode
184 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
187 if (data & SDIO_UHS_SDR104)
188 card->sw_caps.sd3_bus_mode
189 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
190 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
193 ret = mmc_io_rw_direct(card, 0, 0,
194 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
198 if (data & SDIO_DRIVE_SDTA)
199 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
200 if (data & SDIO_DRIVE_SDTC)
201 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
202 if (data & SDIO_DRIVE_SDTD)
203 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
206 /* if no uhs mode ensure we check for high speed */
207 if (!card->sw_caps.sd3_bus_mode) {
208 if (speed & SDIO_SPEED_SHS) {
209 card->cccr.high_speed = 1;
210 card->sw_caps.hs_max_dtr = 50000000;
212 card->cccr.high_speed = 0;
213 card->sw_caps.hs_max_dtr = 25000000;
222 static int sdio_enable_wide(struct mmc_card *card)
227 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
230 if (card->cccr.low_speed && !card->cccr.wide_bus)
233 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
237 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
238 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
239 mmc_hostname(card->host), ctrl);
241 /* set as 4-bit bus width */
242 ctrl &= ~SDIO_BUS_WIDTH_MASK;
243 ctrl |= SDIO_BUS_WIDTH_4BIT;
245 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
253 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
254 * of the card. This may be required on certain setups of boards,
255 * controllers and embedded sdio device which do not need the card's
256 * pull-up. As a result, card detection is disabled and power is saved.
258 static int sdio_disable_cd(struct mmc_card *card)
263 if (!mmc_card_disable_cd(card))
266 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
270 ctrl |= SDIO_BUS_CD_DISABLE;
272 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
276 * Devices that remain active during a system suspend are
277 * put back into 1-bit mode.
279 static int sdio_disable_wide(struct mmc_card *card)
284 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
287 if (card->cccr.low_speed && !card->cccr.wide_bus)
290 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
294 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
297 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
298 ctrl |= SDIO_BUS_ASYNC_INT;
300 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
304 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
309 static int sdio_disable_4bit_bus(struct mmc_card *card)
313 if (card->type == MMC_TYPE_SDIO)
316 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
319 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
322 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
327 return sdio_disable_wide(card);
331 static int sdio_enable_4bit_bus(struct mmc_card *card)
335 err = sdio_enable_wide(card);
338 if (card->type == MMC_TYPE_SDIO)
341 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
342 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
344 sdio_disable_wide(card);
349 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
356 * Test if the card supports high-speed mode and, if so, switch to it.
358 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
363 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
366 if (!card->cccr.high_speed)
369 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
374 speed |= SDIO_SPEED_EHS;
376 speed &= ~SDIO_SPEED_EHS;
378 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
386 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
388 static int sdio_enable_hs(struct mmc_card *card)
392 ret = mmc_sdio_switch_hs(card, true);
393 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
396 ret = mmc_sd_switch_hs(card);
398 mmc_sdio_switch_hs(card, false);
403 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
407 if (mmc_card_hs(card)) {
409 * The SDIO specification doesn't mention how
410 * the CIS transfer speed register relates to
411 * high-speed, but it seems that 50 MHz is
416 max_dtr = card->cis.max_dtr;
419 if (card->type == MMC_TYPE_SD_COMBO)
420 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
425 static unsigned char host_drive_to_sdio_drive(int host_strength)
427 switch (host_strength) {
428 case MMC_SET_DRIVER_TYPE_A:
429 return SDIO_DTSx_SET_TYPE_A;
430 case MMC_SET_DRIVER_TYPE_B:
431 return SDIO_DTSx_SET_TYPE_B;
432 case MMC_SET_DRIVER_TYPE_C:
433 return SDIO_DTSx_SET_TYPE_C;
434 case MMC_SET_DRIVER_TYPE_D:
435 return SDIO_DTSx_SET_TYPE_D;
437 return SDIO_DTSx_SET_TYPE_B;
441 static void sdio_select_driver_type(struct mmc_card *card)
443 int card_drv_type, drive_strength, drv_type;
444 unsigned char card_strength;
447 card->drive_strength = 0;
449 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
451 drive_strength = mmc_select_drive_strength(card,
452 card->sw_caps.uhs_max_dtr,
453 card_drv_type, &drv_type);
455 if (drive_strength) {
456 /* if error just use default for drive strength B */
457 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
462 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
463 card_strength |= host_drive_to_sdio_drive(drive_strength);
465 /* if error default to drive strength B */
466 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
467 card_strength, NULL);
470 card->drive_strength = drive_strength;
474 mmc_set_driver_type(card->host, drv_type);
478 static int sdio_set_bus_speed_mode(struct mmc_card *card)
480 unsigned int bus_speed, timing;
483 unsigned int max_rate;
486 * If the host doesn't support any of the UHS-I modes, fallback on
489 if (!mmc_host_uhs(card->host))
492 bus_speed = SDIO_SPEED_SDR12;
493 timing = MMC_TIMING_UHS_SDR12;
494 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
495 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
496 bus_speed = SDIO_SPEED_SDR104;
497 timing = MMC_TIMING_UHS_SDR104;
498 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
499 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
500 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
501 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
502 bus_speed = SDIO_SPEED_DDR50;
503 timing = MMC_TIMING_UHS_DDR50;
504 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
505 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
506 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
507 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
508 SD_MODE_UHS_SDR50)) {
509 bus_speed = SDIO_SPEED_SDR50;
510 timing = MMC_TIMING_UHS_SDR50;
511 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
512 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
513 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
514 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
515 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
516 bus_speed = SDIO_SPEED_SDR25;
517 timing = MMC_TIMING_UHS_SDR25;
518 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
519 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
520 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
521 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
522 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
523 SD_MODE_UHS_SDR12)) {
524 bus_speed = SDIO_SPEED_SDR12;
525 timing = MMC_TIMING_UHS_SDR12;
526 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
527 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
530 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
534 speed &= ~SDIO_SPEED_BSS_MASK;
536 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
540 max_rate = min_not_zero(card->quirk_max_rate,
541 card->sw_caps.uhs_max_dtr);
543 mmc_set_timing(card->host, timing);
544 mmc_set_clock(card->host, max_rate);
550 * UHS-I specific initialization procedure
552 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
556 if (!card->scr.sda_spec3)
559 /* Switch to wider bus */
560 err = sdio_enable_4bit_bus(card);
564 /* Set the driver strength for the card */
565 sdio_select_driver_type(card);
567 /* Set bus speed mode of the card */
568 err = sdio_set_bus_speed_mode(card);
573 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
574 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
576 if (!mmc_host_is_spi(card->host) &&
577 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
578 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
579 err = mmc_execute_tuning(card);
584 static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
585 struct mmc_card *card)
588 mmc_remove_card(card);
591 * Reset the card by performing the same steps that are taken by
592 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
594 * sdio_reset() is technically not needed. Having just powered up the
595 * hardware, it should already be in reset state. However, some
596 * platforms (such as SD8686 on OLPC) do not instantly cut power,
597 * meaning that a reset is required when restoring power soon after
598 * powering off. It is harmless in other cases.
600 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
601 * is not necessary for non-removable cards. However, it is required
602 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
603 * harmless in other situations.
609 mmc_send_if_cond(host, ocr);
610 return mmc_send_io_op_cond(host, 0, NULL);
614 * Handle the detection and initialisation of a card.
616 * In the case of a resume, "oldcard" will contain the card
617 * we're trying to reinitialise.
619 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
620 struct mmc_card *oldcard)
622 struct mmc_card *card;
628 WARN_ON(!host->claimed);
630 /* to query card if 1.8V signalling is supported */
631 if (mmc_host_uhs(host))
632 ocr |= R4_18V_PRESENT;
636 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
637 ocr &= ~R4_18V_PRESENT;
641 * Inform the card of the voltage
643 err = mmc_send_io_op_cond(host, ocr, &rocr);
648 * For SPI, enable CRC as appropriate.
650 if (mmc_host_is_spi(host)) {
651 err = mmc_spi_set_crc(host, use_spi_crc);
657 * Allocate card structure.
659 card = mmc_alloc_card(host, &sdio_type);
661 return PTR_ERR(card);
663 if ((rocr & R4_MEMORY_PRESENT) &&
664 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
665 card->type = MMC_TYPE_SD_COMBO;
667 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
668 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
673 card->type = MMC_TYPE_SDIO;
675 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
682 * Call the optional HC's init_card function to handle quirks.
684 if (host->ops->init_card)
685 host->ops->init_card(host, card);
688 * If the host and card support UHS-I mode request the card
689 * to switch to 1.8V signaling level. No 1.8v signalling if
690 * UHS mode is not enabled to maintain compatibility and some
691 * systems that claim 1.8v signalling in fact do not support
692 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
693 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
694 * fails to check rocr & R4_18V_PRESENT, but we still need to
695 * try to init uhs card. sdio_read_cccr will take over this task
696 * to make sure which speed mode should work.
698 if (rocr & ocr & R4_18V_PRESENT) {
699 err = mmc_set_uhs_voltage(host, ocr_card);
700 if (err == -EAGAIN) {
701 mmc_sdio_pre_init(host, ocr_card, card);
705 ocr &= ~R4_18V_PRESENT;
710 * For native busses: set card RCA and quit open drain mode.
712 if (!mmc_host_is_spi(host)) {
713 err = mmc_send_relative_addr(host, &card->rca);
718 * Update oldcard with the new RCA received from the SDIO
719 * device -- we're doing this so that it's updated in the
720 * "card" struct when oldcard overwrites that later.
723 oldcard->rca = card->rca;
727 * Read CSD, before selecting the card
729 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
730 err = mmc_sd_get_csd(host, card);
734 mmc_decode_cid(card);
738 * Select card, as all following commands rely on that.
740 if (!mmc_host_is_spi(host)) {
741 err = mmc_select_card(card);
746 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
748 * This is non-standard SDIO device, meaning it doesn't
749 * have any CIA (Common I/O area) registers present.
750 * It's host's responsibility to fill cccr and cis
751 * structures in init_card().
753 mmc_set_clock(host, card->cis.max_dtr);
755 if (card->cccr.high_speed) {
756 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
760 mmc_remove_card(card);
768 * Read the common registers. Note that we should try to
769 * validate whether UHS would work or not.
771 err = sdio_read_cccr(card, ocr);
773 mmc_sdio_pre_init(host, ocr_card, card);
774 if (ocr & R4_18V_PRESENT) {
775 /* Retry init sequence, but without R4_18V_PRESENT. */
783 * Read the common CIS tuples.
785 err = sdio_read_common_cis(card);
790 if (card->cis.vendor == oldcard->cis.vendor &&
791 card->cis.device == oldcard->cis.device) {
792 mmc_remove_card(card);
799 card->ocr = ocr_card;
800 mmc_fixup_device(card, sdio_fixup_methods);
802 if (card->type == MMC_TYPE_SD_COMBO) {
803 err = mmc_sd_setup_card(host, card, oldcard != NULL);
804 /* handle as SDIO-only card if memory init failed */
807 if (mmc_host_is_spi(host))
808 /* should not fail, as it worked previously */
809 mmc_spi_set_crc(host, use_spi_crc);
810 card->type = MMC_TYPE_SDIO;
812 card->dev.type = &sd_type;
816 * If needed, disconnect card detection pull-up resistor.
818 err = sdio_disable_cd(card);
822 /* Initialization sequence for UHS-I cards */
823 /* Only if card supports 1.8v and UHS signaling */
824 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
825 err = mmc_sdio_init_uhs_card(card);
830 * Switch to high-speed (if supported).
832 err = sdio_enable_hs(card);
834 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
839 * Change to the card's maximum speed.
841 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
844 * Switch to wider bus (if supported).
846 err = sdio_enable_4bit_bus(card);
851 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
852 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
853 pr_err("%s: Host failed to negotiate down from 3.3V\n",
863 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
866 mmc_remove_card(card);
870 static int mmc_sdio_reinit_card(struct mmc_host *host)
874 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
878 return mmc_sdio_init_card(host, host->card->ocr, host->card);
882 * Host is being removed. Free up the current card.
884 static void mmc_sdio_remove(struct mmc_host *host)
888 for (i = 0;i < host->card->sdio_funcs;i++) {
889 if (host->card->sdio_func[i]) {
890 sdio_remove_func(host->card->sdio_func[i]);
891 host->card->sdio_func[i] = NULL;
895 mmc_remove_card(host->card);
900 * Card detection - card is alive.
902 static int mmc_sdio_alive(struct mmc_host *host)
904 return mmc_select_card(host->card);
908 * Card detection callback from host.
910 static void mmc_sdio_detect(struct mmc_host *host)
914 /* Make sure card is powered before detecting it */
915 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
916 err = pm_runtime_get_sync(&host->card->dev);
918 pm_runtime_put_noidle(&host->card->dev);
923 mmc_claim_host(host);
926 * Just check if our card has been removed.
928 err = _mmc_detect_card_removed(host);
930 mmc_release_host(host);
933 * Tell PM core it's OK to power off the card now.
935 * The _sync variant is used in order to ensure that the card
936 * is left powered off in case an error occurred, and the card
937 * is going to be removed.
939 * Since there is no specific reason to believe a new user
940 * is about to show up at this point, the _sync variant is
943 if (host->caps & MMC_CAP_POWER_OFF_CARD)
944 pm_runtime_put_sync(&host->card->dev);
948 mmc_sdio_remove(host);
950 mmc_claim_host(host);
951 mmc_detach_bus(host);
953 mmc_release_host(host);
958 * SDIO pre_suspend. We need to suspend all functions separately.
959 * Therefore all registered functions must have drivers with suspend
960 * and resume methods. Failing that we simply remove the whole card.
962 static int mmc_sdio_pre_suspend(struct mmc_host *host)
966 for (i = 0; i < host->card->sdio_funcs; i++) {
967 struct sdio_func *func = host->card->sdio_func[i];
968 if (func && sdio_func_present(func) && func->dev.driver) {
969 const struct dev_pm_ops *pmops = func->dev.driver->pm;
970 if (!pmops || !pmops->suspend || !pmops->resume) {
971 /* force removal of entire card in that case */
982 * SDIO suspend. Suspend all functions separately.
984 static int mmc_sdio_suspend(struct mmc_host *host)
986 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
988 /* Prevent processing of SDIO IRQs in suspended state. */
989 mmc_card_set_suspended(host->card);
990 cancel_delayed_work_sync(&host->sdio_irq_work);
992 mmc_claim_host(host);
994 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
995 sdio_disable_4bit_bus(host->card);
997 if (!mmc_card_keep_power(host)) {
999 } else if (host->retune_period) {
1000 mmc_retune_timer_stop(host);
1001 mmc_retune_needed(host);
1004 mmc_release_host(host);
1009 static int mmc_sdio_resume(struct mmc_host *host)
1013 /* Basic card reinitialization. */
1014 mmc_claim_host(host);
1017 * Restore power and reinitialize the card when needed. Note that a
1018 * removable card is checked from a detect work later on in the resume
1021 if (!mmc_card_keep_power(host)) {
1022 mmc_power_up(host, host->card->ocr);
1024 * Tell runtime PM core we just powered up the card,
1025 * since it still believes the card is powered off.
1026 * Note that currently runtime PM is only enabled
1027 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1029 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1030 pm_runtime_disable(&host->card->dev);
1031 pm_runtime_set_active(&host->card->dev);
1032 pm_runtime_enable(&host->card->dev);
1034 err = mmc_sdio_reinit_card(host);
1035 } else if (mmc_card_wake_sdio_irq(host)) {
1036 /* We may have switched to 1-bit mode during suspend */
1037 err = sdio_enable_4bit_bus(host->card);
1043 /* Allow SDIO IRQs to be processed again. */
1044 mmc_card_clr_suspended(host->card);
1046 if (host->sdio_irqs) {
1047 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1048 wake_up_process(host->sdio_irq_thread);
1049 else if (host->caps & MMC_CAP_SDIO_IRQ)
1050 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1054 mmc_release_host(host);
1056 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1060 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1062 /* No references to the card, cut the power to it. */
1063 mmc_claim_host(host);
1064 mmc_power_off(host);
1065 mmc_release_host(host);
1070 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1074 /* Restore power and re-initialize. */
1075 mmc_claim_host(host);
1076 mmc_power_up(host, host->card->ocr);
1077 ret = mmc_sdio_reinit_card(host);
1078 mmc_release_host(host);
1086 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1087 * reset was asynchronously scheduled, else a negative error code.
1089 static int mmc_sdio_hw_reset(struct mmc_host *host)
1091 struct mmc_card *card = host->card;
1094 * In case the card is shared among multiple func drivers, reset the
1095 * card through a rescan work. In this way it will be removed and
1096 * re-detected, thus all func drivers becomes informed about it.
1098 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1099 if (mmc_card_removed(card))
1101 host->rescan_entered = 0;
1102 mmc_card_set_removed(card);
1103 _mmc_detect_change(host, 0, false);
1108 * A single func driver has been probed, then let's skip the heavy
1109 * hotplug dance above and execute the reset immediately.
1111 mmc_power_cycle(host, card->ocr);
1112 return mmc_sdio_reinit_card(host);
1115 static int mmc_sdio_sw_reset(struct mmc_host *host)
1117 mmc_set_clock(host, host->f_init);
1121 mmc_set_initial_state(host);
1122 mmc_set_initial_signal_voltage(host);
1124 return mmc_sdio_reinit_card(host);
1127 static const struct mmc_bus_ops mmc_sdio_ops = {
1128 .remove = mmc_sdio_remove,
1129 .detect = mmc_sdio_detect,
1130 .pre_suspend = mmc_sdio_pre_suspend,
1131 .suspend = mmc_sdio_suspend,
1132 .resume = mmc_sdio_resume,
1133 .runtime_suspend = mmc_sdio_runtime_suspend,
1134 .runtime_resume = mmc_sdio_runtime_resume,
1135 .alive = mmc_sdio_alive,
1136 .hw_reset = mmc_sdio_hw_reset,
1137 .sw_reset = mmc_sdio_sw_reset,
1142 * Starting point for SDIO card init.
1144 int mmc_attach_sdio(struct mmc_host *host)
1148 struct mmc_card *card;
1150 WARN_ON(!host->claimed);
1152 err = mmc_send_io_op_cond(host, 0, &ocr);
1156 mmc_attach_bus(host, &mmc_sdio_ops);
1157 if (host->ocr_avail_sdio)
1158 host->ocr_avail = host->ocr_avail_sdio;
1161 rocr = mmc_select_voltage(host, ocr);
1164 * Can we support the voltage(s) of the card(s)?
1172 * Detect and init the card.
1174 err = mmc_sdio_init_card(host, rocr, NULL);
1181 * Enable runtime PM only if supported by host+card+board
1183 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1185 * Do not allow runtime suspend until after SDIO function
1186 * devices are added.
1188 pm_runtime_get_noresume(&card->dev);
1191 * Let runtime PM core know our card is active
1193 err = pm_runtime_set_active(&card->dev);
1198 * Enable runtime PM for this card
1200 pm_runtime_enable(&card->dev);
1204 * The number of functions on the card is encoded inside
1207 funcs = (ocr & 0x70000000) >> 28;
1208 card->sdio_funcs = 0;
1211 * Initialize (but don't add) all present functions.
1213 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1214 err = sdio_init_func(host->card, i + 1);
1219 * Enable Runtime PM for this func (if supported)
1221 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1222 pm_runtime_enable(&card->sdio_func[i]->dev);
1226 * First add the card to the driver model...
1228 mmc_release_host(host);
1229 err = mmc_add_card(host->card);
1234 * ...then the SDIO functions.
1236 for (i = 0;i < funcs;i++) {
1237 err = sdio_add_func(host->card->sdio_func[i]);
1242 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1243 pm_runtime_put(&card->dev);
1245 mmc_claim_host(host);
1250 mmc_release_host(host);
1253 * The devices are being deleted so it is not necessary to disable
1254 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1255 * because it needs to be active to remove any function devices that
1256 * were probed, and after that it gets deleted.
1258 mmc_sdio_remove(host);
1259 mmc_claim_host(host);
1261 mmc_detach_bus(host);
1263 pr_err("%s: error %d whilst initialising SDIO card\n",
1264 mmc_hostname(host), err);