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>
10 #include <linux/sysfs.h>
12 #include <linux/mmc/host.h>
13 #include <linux/mmc/card.h>
14 #include <linux/mmc/mmc.h>
15 #include <linux/mmc/sdio.h>
16 #include <linux/mmc/sdio_func.h>
17 #include <linux/mmc/sdio_ids.h>
31 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
32 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
33 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
34 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
35 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
37 #define sdio_info_attr(num) \
38 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
40 struct mmc_card *card = mmc_dev_to_card(dev); \
42 if (num > card->num_info) \
44 if (!card->info[num - 1][0]) \
46 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
48 static DEVICE_ATTR_RO(info##num)
55 static struct attribute *sdio_std_attrs[] = {
56 &dev_attr_vendor.attr,
57 &dev_attr_device.attr,
58 &dev_attr_revision.attr,
67 ATTRIBUTE_GROUPS(sdio_std);
69 static struct device_type sdio_type = {
70 .groups = sdio_std_groups,
73 static int sdio_read_fbr(struct sdio_func *func)
78 if (mmc_card_nonstd_func_interface(func->card)) {
79 func->class = SDIO_CLASS_NONE;
83 ret = mmc_io_rw_direct(func->card, 0, 0,
84 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
91 ret = mmc_io_rw_direct(func->card, 0, 0,
92 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
103 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
106 struct sdio_func *func;
108 if (WARN_ON(fn > SDIO_MAX_FUNCS))
111 func = sdio_alloc_func(card);
113 return PTR_ERR(func);
117 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
118 ret = sdio_read_fbr(func);
122 ret = sdio_read_func_cis(func);
126 func->vendor = func->card->cis.vendor;
127 func->device = func->card->cis.device;
128 func->max_blksize = func->card->cis.blksize;
131 card->sdio_func[fn - 1] = func;
137 * It is okay to remove the function here even though we hold
138 * the host lock as we haven't registered the device yet.
140 sdio_remove_func(func);
144 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
148 int uhs = ocr & R4_18V_PRESENT;
152 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
156 cccr_vsn = data & 0x0f;
158 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
159 pr_err("%s: unrecognised CCCR structure version %d\n",
160 mmc_hostname(card->host), cccr_vsn);
164 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
170 if (data & SDIO_CCCR_CAP_SMB)
171 card->cccr.multi_block = 1;
172 if (data & SDIO_CCCR_CAP_LSC)
173 card->cccr.low_speed = 1;
174 if (data & SDIO_CCCR_CAP_4BLS)
175 card->cccr.wide_bus = 1;
177 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
178 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
182 if (data & SDIO_POWER_SMPC)
183 card->cccr.high_power = 1;
186 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
187 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
191 card->scr.sda_spec3 = 0;
192 card->sw_caps.sd3_bus_mode = 0;
193 card->sw_caps.sd3_drv_type = 0;
194 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
195 card->scr.sda_spec3 = 1;
196 ret = mmc_io_rw_direct(card, 0, 0,
197 SDIO_CCCR_UHS, 0, &data);
201 if (mmc_host_uhs(card->host)) {
202 if (data & SDIO_UHS_DDR50)
203 card->sw_caps.sd3_bus_mode
204 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
205 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
207 if (data & SDIO_UHS_SDR50)
208 card->sw_caps.sd3_bus_mode
209 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
212 if (data & SDIO_UHS_SDR104)
213 card->sw_caps.sd3_bus_mode
214 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
215 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
218 ret = mmc_io_rw_direct(card, 0, 0,
219 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
223 if (data & SDIO_DRIVE_SDTA)
224 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
225 if (data & SDIO_DRIVE_SDTC)
226 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
227 if (data & SDIO_DRIVE_SDTD)
228 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
230 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0, &data);
234 if (data & SDIO_INTERRUPT_EXT_SAI) {
235 data |= SDIO_INTERRUPT_EXT_EAI;
236 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,
241 card->cccr.enable_async_irq = 1;
245 /* if no uhs mode ensure we check for high speed */
246 if (!card->sw_caps.sd3_bus_mode) {
247 if (speed & SDIO_SPEED_SHS) {
248 card->cccr.high_speed = 1;
249 card->sw_caps.hs_max_dtr = 50000000;
251 card->cccr.high_speed = 0;
252 card->sw_caps.hs_max_dtr = 25000000;
261 static int sdio_enable_wide(struct mmc_card *card)
266 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
269 if (card->cccr.low_speed && !card->cccr.wide_bus)
272 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
276 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
277 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
278 mmc_hostname(card->host), ctrl);
280 /* set as 4-bit bus width */
281 ctrl &= ~SDIO_BUS_WIDTH_MASK;
282 ctrl |= SDIO_BUS_WIDTH_4BIT;
284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
292 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
293 * of the card. This may be required on certain setups of boards,
294 * controllers and embedded sdio device which do not need the card's
295 * pull-up. As a result, card detection is disabled and power is saved.
297 static int sdio_disable_cd(struct mmc_card *card)
302 if (!mmc_card_disable_cd(card))
305 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
309 ctrl |= SDIO_BUS_CD_DISABLE;
311 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
315 * Devices that remain active during a system suspend are
316 * put back into 1-bit mode.
318 static int sdio_disable_wide(struct mmc_card *card)
323 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
326 if (card->cccr.low_speed && !card->cccr.wide_bus)
329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
333 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
336 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
337 ctrl |= SDIO_BUS_ASYNC_INT;
339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
343 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
348 static int sdio_disable_4bit_bus(struct mmc_card *card)
352 if (mmc_card_sdio(card))
355 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
358 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
361 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
366 return sdio_disable_wide(card);
370 static int sdio_enable_4bit_bus(struct mmc_card *card)
374 err = sdio_enable_wide(card);
377 if (mmc_card_sdio(card))
380 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
381 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
383 sdio_disable_wide(card);
388 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
395 * Test if the card supports high-speed mode and, if so, switch to it.
397 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
402 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
405 if (!card->cccr.high_speed)
408 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
413 speed |= SDIO_SPEED_EHS;
415 speed &= ~SDIO_SPEED_EHS;
417 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
425 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
427 static int sdio_enable_hs(struct mmc_card *card)
431 ret = mmc_sdio_switch_hs(card, true);
432 if (ret <= 0 || mmc_card_sdio(card))
435 ret = mmc_sd_switch_hs(card);
437 mmc_sdio_switch_hs(card, false);
442 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
446 if (mmc_card_hs(card)) {
448 * The SDIO specification doesn't mention how
449 * the CIS transfer speed register relates to
450 * high-speed, but it seems that 50 MHz is
455 max_dtr = card->cis.max_dtr;
458 if (mmc_card_sd_combo(card))
459 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
464 static unsigned char host_drive_to_sdio_drive(int host_strength)
466 switch (host_strength) {
467 case MMC_SET_DRIVER_TYPE_A:
468 return SDIO_DTSx_SET_TYPE_A;
469 case MMC_SET_DRIVER_TYPE_B:
470 return SDIO_DTSx_SET_TYPE_B;
471 case MMC_SET_DRIVER_TYPE_C:
472 return SDIO_DTSx_SET_TYPE_C;
473 case MMC_SET_DRIVER_TYPE_D:
474 return SDIO_DTSx_SET_TYPE_D;
476 return SDIO_DTSx_SET_TYPE_B;
480 static void sdio_select_driver_type(struct mmc_card *card)
482 int card_drv_type, drive_strength, drv_type;
483 unsigned char card_strength;
486 card->drive_strength = 0;
488 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
490 drive_strength = mmc_select_drive_strength(card,
491 card->sw_caps.uhs_max_dtr,
492 card_drv_type, &drv_type);
494 if (drive_strength) {
495 /* if error just use default for drive strength B */
496 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
501 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
502 card_strength |= host_drive_to_sdio_drive(drive_strength);
504 /* if error default to drive strength B */
505 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
506 card_strength, NULL);
509 card->drive_strength = drive_strength;
513 mmc_set_driver_type(card->host, drv_type);
517 static int sdio_set_bus_speed_mode(struct mmc_card *card)
519 unsigned int bus_speed, timing;
522 unsigned int max_rate;
525 * If the host doesn't support any of the UHS-I modes, fallback on
528 if (!mmc_host_uhs(card->host))
531 bus_speed = SDIO_SPEED_SDR12;
532 timing = MMC_TIMING_UHS_SDR12;
533 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
534 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
535 bus_speed = SDIO_SPEED_SDR104;
536 timing = MMC_TIMING_UHS_SDR104;
537 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
538 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
539 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
540 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
541 bus_speed = SDIO_SPEED_DDR50;
542 timing = MMC_TIMING_UHS_DDR50;
543 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
544 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
545 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
546 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
547 SD_MODE_UHS_SDR50)) {
548 bus_speed = SDIO_SPEED_SDR50;
549 timing = MMC_TIMING_UHS_SDR50;
550 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
551 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
552 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
553 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
554 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
555 bus_speed = SDIO_SPEED_SDR25;
556 timing = MMC_TIMING_UHS_SDR25;
557 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
558 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
559 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
560 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
561 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
562 SD_MODE_UHS_SDR12)) {
563 bus_speed = SDIO_SPEED_SDR12;
564 timing = MMC_TIMING_UHS_SDR12;
565 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
566 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
569 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
573 speed &= ~SDIO_SPEED_BSS_MASK;
575 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
579 max_rate = min_not_zero(card->quirk_max_rate,
580 card->sw_caps.uhs_max_dtr);
582 mmc_set_timing(card->host, timing);
583 mmc_set_clock(card->host, max_rate);
589 * UHS-I specific initialization procedure
591 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
595 if (!card->scr.sda_spec3)
598 /* Switch to wider bus */
599 err = sdio_enable_4bit_bus(card);
603 /* Set the driver strength for the card */
604 sdio_select_driver_type(card);
606 /* Set bus speed mode of the card */
607 err = sdio_set_bus_speed_mode(card);
612 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
613 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
615 if (!mmc_host_is_spi(card->host) &&
616 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
617 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
618 err = mmc_execute_tuning(card);
623 static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
624 struct mmc_card *card)
627 mmc_remove_card(card);
630 * Reset the card by performing the same steps that are taken by
631 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
633 * sdio_reset() is technically not needed. Having just powered up the
634 * hardware, it should already be in reset state. However, some
635 * platforms (such as SD8686 on OLPC) do not instantly cut power,
636 * meaning that a reset is required when restoring power soon after
637 * powering off. It is harmless in other cases.
639 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
640 * is not necessary for non-removable cards. However, it is required
641 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
642 * harmless in other situations.
648 mmc_send_if_cond(host, ocr);
649 return mmc_send_io_op_cond(host, 0, NULL);
653 * Handle the detection and initialisation of a card.
655 * In the case of a resume, "oldcard" will contain the card
656 * we're trying to reinitialise.
658 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
659 struct mmc_card *oldcard)
661 struct mmc_card *card;
667 WARN_ON(!host->claimed);
669 /* to query card if 1.8V signalling is supported */
670 if (mmc_host_uhs(host))
671 ocr |= R4_18V_PRESENT;
675 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
676 ocr &= ~R4_18V_PRESENT;
680 * Inform the card of the voltage
682 err = mmc_send_io_op_cond(host, ocr, &rocr);
687 * For SPI, enable CRC as appropriate.
689 if (mmc_host_is_spi(host)) {
690 err = mmc_spi_set_crc(host, use_spi_crc);
696 * Allocate card structure.
698 card = mmc_alloc_card(host, &sdio_type);
700 return PTR_ERR(card);
702 if ((rocr & R4_MEMORY_PRESENT) &&
703 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
704 card->type = MMC_TYPE_SD_COMBO;
706 if (oldcard && (!mmc_card_sd_combo(oldcard) ||
707 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
712 card->type = MMC_TYPE_SDIO;
714 if (oldcard && !mmc_card_sdio(oldcard)) {
721 * Call the optional HC's init_card function to handle quirks.
723 if (host->ops->init_card)
724 host->ops->init_card(host, card);
725 mmc_fixup_device(card, sdio_card_init_methods);
727 card->ocr = ocr_card;
730 * If the host and card support UHS-I mode request the card
731 * to switch to 1.8V signaling level. No 1.8v signalling if
732 * UHS mode is not enabled to maintain compatibility and some
733 * systems that claim 1.8v signalling in fact do not support
734 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
735 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
736 * fails to check rocr & R4_18V_PRESENT, but we still need to
737 * try to init uhs card. sdio_read_cccr will take over this task
738 * to make sure which speed mode should work.
740 if (rocr & ocr & R4_18V_PRESENT) {
741 err = mmc_set_uhs_voltage(host, ocr_card);
742 if (err == -EAGAIN) {
743 mmc_sdio_pre_init(host, ocr_card, card);
747 ocr &= ~R4_18V_PRESENT;
752 * For native busses: set card RCA and quit open drain mode.
754 if (!mmc_host_is_spi(host)) {
755 err = mmc_send_relative_addr(host, &card->rca);
760 * Update oldcard with the new RCA received from the SDIO
761 * device -- we're doing this so that it's updated in the
762 * "card" struct when oldcard overwrites that later.
765 oldcard->rca = card->rca;
769 * Read CSD, before selecting the card
771 if (!oldcard && mmc_card_sd_combo(card)) {
772 err = mmc_sd_get_csd(card);
776 mmc_decode_cid(card);
780 * Select card, as all following commands rely on that.
782 if (!mmc_host_is_spi(host)) {
783 err = mmc_select_card(card);
788 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
790 * This is non-standard SDIO device, meaning it doesn't
791 * have any CIA (Common I/O area) registers present.
792 * It's host's responsibility to fill cccr and cis
793 * structures in init_card().
795 mmc_set_clock(host, card->cis.max_dtr);
797 if (card->cccr.high_speed) {
798 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
802 mmc_remove_card(card);
810 * Read the common registers. Note that we should try to
811 * validate whether UHS would work or not.
813 err = sdio_read_cccr(card, ocr);
815 mmc_sdio_pre_init(host, ocr_card, card);
816 if (ocr & R4_18V_PRESENT) {
817 /* Retry init sequence, but without R4_18V_PRESENT. */
825 * Read the common CIS tuples.
827 err = sdio_read_common_cis(card);
832 if (card->cis.vendor == oldcard->cis.vendor &&
833 card->cis.device == oldcard->cis.device) {
834 mmc_remove_card(card);
842 mmc_fixup_device(card, sdio_fixup_methods);
844 if (mmc_card_sd_combo(card)) {
845 err = mmc_sd_setup_card(host, card, oldcard != NULL);
846 /* handle as SDIO-only card if memory init failed */
849 if (mmc_host_is_spi(host))
850 /* should not fail, as it worked previously */
851 mmc_spi_set_crc(host, use_spi_crc);
852 card->type = MMC_TYPE_SDIO;
854 card->dev.type = &sd_type;
858 * If needed, disconnect card detection pull-up resistor.
860 err = sdio_disable_cd(card);
864 /* Initialization sequence for UHS-I cards */
865 /* Only if card supports 1.8v and UHS signaling */
866 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
867 err = mmc_sdio_init_uhs_card(card);
872 * Switch to high-speed (if supported).
874 err = sdio_enable_hs(card);
876 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
881 * Change to the card's maximum speed.
883 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
886 * Switch to wider bus (if supported).
888 err = sdio_enable_4bit_bus(card);
893 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
894 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
895 pr_err("%s: Host failed to negotiate down from 3.3V\n",
905 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
908 mmc_remove_card(card);
912 static int mmc_sdio_reinit_card(struct mmc_host *host)
916 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
920 return mmc_sdio_init_card(host, host->card->ocr, host->card);
924 * Host is being removed. Free up the current card.
926 static void mmc_sdio_remove(struct mmc_host *host)
930 for (i = 0;i < host->card->sdio_funcs;i++) {
931 if (host->card->sdio_func[i]) {
932 sdio_remove_func(host->card->sdio_func[i]);
933 host->card->sdio_func[i] = NULL;
937 mmc_remove_card(host->card);
942 * Card detection - card is alive.
944 static int mmc_sdio_alive(struct mmc_host *host)
946 return mmc_select_card(host->card);
950 * Card detection callback from host.
952 static void mmc_sdio_detect(struct mmc_host *host)
956 /* Make sure card is powered before detecting it */
957 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
958 err = pm_runtime_resume_and_get(&host->card->dev);
963 mmc_claim_host(host);
966 * Just check if our card has been removed.
968 err = _mmc_detect_card_removed(host);
970 mmc_release_host(host);
973 * Tell PM core it's OK to power off the card now.
975 * The _sync variant is used in order to ensure that the card
976 * is left powered off in case an error occurred, and the card
977 * is going to be removed.
979 * Since there is no specific reason to believe a new user
980 * is about to show up at this point, the _sync variant is
983 if (host->caps & MMC_CAP_POWER_OFF_CARD)
984 pm_runtime_put_sync(&host->card->dev);
988 mmc_sdio_remove(host);
990 mmc_claim_host(host);
991 mmc_detach_bus(host);
993 mmc_release_host(host);
998 * SDIO pre_suspend. We need to suspend all functions separately.
999 * Therefore all registered functions must have drivers with suspend
1000 * and resume methods. Failing that we simply remove the whole card.
1002 static int mmc_sdio_pre_suspend(struct mmc_host *host)
1006 for (i = 0; i < host->card->sdio_funcs; i++) {
1007 struct sdio_func *func = host->card->sdio_func[i];
1008 if (func && sdio_func_present(func) && func->dev.driver) {
1009 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1010 if (!pmops || !pmops->suspend || !pmops->resume)
1011 /* force removal of entire card in that case */
1019 if (!mmc_card_is_removable(host)) {
1020 dev_warn(mmc_dev(host),
1021 "missing suspend/resume ops for non-removable SDIO card\n");
1022 /* Don't remove a non-removable card - we can't re-detect it. */
1026 /* Remove the SDIO card and let it be re-detected later on. */
1027 mmc_sdio_remove(host);
1028 mmc_claim_host(host);
1029 mmc_detach_bus(host);
1030 mmc_power_off(host);
1031 mmc_release_host(host);
1038 * SDIO suspend. Suspend all functions separately.
1040 static int mmc_sdio_suspend(struct mmc_host *host)
1042 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
1044 /* Prevent processing of SDIO IRQs in suspended state. */
1045 mmc_card_set_suspended(host->card);
1046 cancel_work_sync(&host->sdio_irq_work);
1048 mmc_claim_host(host);
1050 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
1051 sdio_disable_4bit_bus(host->card);
1053 if (!mmc_card_keep_power(host)) {
1054 mmc_power_off(host);
1055 } else if (host->retune_period) {
1056 mmc_retune_timer_stop(host);
1057 mmc_retune_needed(host);
1060 mmc_release_host(host);
1065 static int mmc_sdio_resume(struct mmc_host *host)
1069 /* Basic card reinitialization. */
1070 mmc_claim_host(host);
1073 * Restore power and reinitialize the card when needed. Note that a
1074 * removable card is checked from a detect work later on in the resume
1077 if (!mmc_card_keep_power(host)) {
1078 mmc_power_up(host, host->card->ocr);
1080 * Tell runtime PM core we just powered up the card,
1081 * since it still believes the card is powered off.
1082 * Note that currently runtime PM is only enabled
1083 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1085 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1086 pm_runtime_disable(&host->card->dev);
1087 pm_runtime_set_active(&host->card->dev);
1088 pm_runtime_enable(&host->card->dev);
1090 err = mmc_sdio_reinit_card(host);
1091 } else if (mmc_card_wake_sdio_irq(host)) {
1092 /* We may have switched to 1-bit mode during suspend */
1093 err = sdio_enable_4bit_bus(host->card);
1099 /* Allow SDIO IRQs to be processed again. */
1100 mmc_card_clr_suspended(host->card);
1102 if (host->sdio_irqs) {
1103 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1104 wake_up_process(host->sdio_irq_thread);
1105 else if (host->caps & MMC_CAP_SDIO_IRQ)
1106 schedule_work(&host->sdio_irq_work);
1110 mmc_release_host(host);
1112 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1116 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1118 /* No references to the card, cut the power to it. */
1119 mmc_claim_host(host);
1120 mmc_power_off(host);
1121 mmc_release_host(host);
1126 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1130 /* Restore power and re-initialize. */
1131 mmc_claim_host(host);
1132 mmc_power_up(host, host->card->ocr);
1133 ret = mmc_sdio_reinit_card(host);
1134 mmc_release_host(host);
1142 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1143 * reset was asynchronously scheduled, else a negative error code.
1145 static int mmc_sdio_hw_reset(struct mmc_host *host)
1147 struct mmc_card *card = host->card;
1150 * In case the card is shared among multiple func drivers, reset the
1151 * card through a rescan work. In this way it will be removed and
1152 * re-detected, thus all func drivers becomes informed about it.
1154 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1155 if (mmc_card_removed(card))
1157 host->rescan_entered = 0;
1158 mmc_card_set_removed(card);
1159 _mmc_detect_change(host, 0, false);
1164 * A single func driver has been probed, then let's skip the heavy
1165 * hotplug dance above and execute the reset immediately.
1167 mmc_power_cycle(host, card->ocr);
1168 return mmc_sdio_reinit_card(host);
1171 static int mmc_sdio_sw_reset(struct mmc_host *host)
1173 mmc_set_clock(host, host->f_init);
1177 mmc_set_initial_state(host);
1178 mmc_set_initial_signal_voltage(host);
1180 return mmc_sdio_reinit_card(host);
1183 static const struct mmc_bus_ops mmc_sdio_ops = {
1184 .remove = mmc_sdio_remove,
1185 .detect = mmc_sdio_detect,
1186 .pre_suspend = mmc_sdio_pre_suspend,
1187 .suspend = mmc_sdio_suspend,
1188 .resume = mmc_sdio_resume,
1189 .runtime_suspend = mmc_sdio_runtime_suspend,
1190 .runtime_resume = mmc_sdio_runtime_resume,
1191 .alive = mmc_sdio_alive,
1192 .hw_reset = mmc_sdio_hw_reset,
1193 .sw_reset = mmc_sdio_sw_reset,
1198 * Starting point for SDIO card init.
1200 int mmc_attach_sdio(struct mmc_host *host)
1204 struct mmc_card *card;
1206 WARN_ON(!host->claimed);
1208 err = mmc_send_io_op_cond(host, 0, &ocr);
1212 mmc_attach_bus(host, &mmc_sdio_ops);
1213 if (host->ocr_avail_sdio)
1214 host->ocr_avail = host->ocr_avail_sdio;
1217 rocr = mmc_select_voltage(host, ocr);
1220 * Can we support the voltage(s) of the card(s)?
1228 * Detect and init the card.
1230 err = mmc_sdio_init_card(host, rocr, NULL);
1237 * Enable runtime PM only if supported by host+card+board
1239 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1241 * Do not allow runtime suspend until after SDIO function
1242 * devices are added.
1244 pm_runtime_get_noresume(&card->dev);
1247 * Let runtime PM core know our card is active
1249 err = pm_runtime_set_active(&card->dev);
1254 * Enable runtime PM for this card
1256 pm_runtime_enable(&card->dev);
1260 * The number of functions on the card is encoded inside
1263 funcs = (ocr & 0x70000000) >> 28;
1264 card->sdio_funcs = 0;
1267 * Initialize (but don't add) all present functions.
1269 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1270 err = sdio_init_func(host->card, i + 1);
1275 * Enable Runtime PM for this func (if supported)
1277 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1278 pm_runtime_enable(&card->sdio_func[i]->dev);
1282 * First add the card to the driver model...
1284 mmc_release_host(host);
1285 err = mmc_add_card(host->card);
1290 * ...then the SDIO functions.
1292 for (i = 0;i < funcs;i++) {
1293 err = sdio_add_func(host->card->sdio_func[i]);
1298 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1299 pm_runtime_put(&card->dev);
1301 mmc_claim_host(host);
1306 mmc_release_host(host);
1309 * The devices are being deleted so it is not necessary to disable
1310 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1311 * because it needs to be active to remove any function devices that
1312 * were probed, and after that it gets deleted.
1314 mmc_sdio_remove(host);
1315 mmc_claim_host(host);
1317 mmc_detach_bus(host);
1319 pr_err("%s: error %d whilst initialising SDIO card\n",
1320 mmc_hostname(host), err);