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/module.h>
14 #include <linux/pm_runtime.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sdio.h>
20 #include <linux/mmc/sdio_func.h>
21 #include <linux/mmc/sdio_ids.h>
32 #ifdef CONFIG_MMC_EMBEDDED_SDIO
33 #include <linux/mmc/sdio_ids.h>
36 static int sdio_read_fbr(struct sdio_func *func)
41 if (mmc_card_nonstd_func_interface(func->card)) {
42 func->class = SDIO_CLASS_NONE;
46 ret = mmc_io_rw_direct(func->card, 0, 0,
47 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
54 ret = mmc_io_rw_direct(func->card, 0, 0,
55 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
66 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
69 struct sdio_func *func;
71 BUG_ON(fn > SDIO_MAX_FUNCS);
73 func = sdio_alloc_func(card);
79 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
80 ret = sdio_read_fbr(func);
84 ret = sdio_read_func_cis(func);
88 func->vendor = func->card->cis.vendor;
89 func->device = func->card->cis.device;
90 func->max_blksize = func->card->cis.blksize;
93 card->sdio_func[fn - 1] = func;
99 * It is okay to remove the function here even though we hold
100 * the host lock as we haven't registered the device yet.
102 sdio_remove_func(func);
106 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
110 int uhs = ocr & R4_18V_PRESENT;
114 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
116 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
120 cccr_vsn = data & 0x0f;
122 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
123 pr_err("%s: unrecognised CCCR structure version %d\n",
124 mmc_hostname(card->host), cccr_vsn);
128 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
130 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
134 if (data & SDIO_CCCR_CAP_SMB)
135 card->cccr.multi_block = 1;
136 if (data & SDIO_CCCR_CAP_LSC)
137 card->cccr.low_speed = 1;
138 if (data & SDIO_CCCR_CAP_4BLS)
139 card->cccr.wide_bus = 1;
141 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
142 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
146 if (data & SDIO_POWER_SMPC)
147 card->cccr.high_power = 1;
150 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
151 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
155 card->scr.sda_spec3 = 0;
156 card->sw_caps.sd3_bus_mode = 0;
157 card->sw_caps.sd3_drv_type = 0;
158 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
159 card->scr.sda_spec3 = 1;
160 ret = mmc_io_rw_direct(card, 0, 0,
161 SDIO_CCCR_UHS, 0, &data);
165 if (mmc_host_uhs(card->host)) {
166 if (data & SDIO_UHS_DDR50)
167 card->sw_caps.sd3_bus_mode
168 |= SD_MODE_UHS_DDR50;
170 if (data & SDIO_UHS_SDR50)
171 card->sw_caps.sd3_bus_mode
172 |= SD_MODE_UHS_SDR50;
174 if (data & SDIO_UHS_SDR104)
175 card->sw_caps.sd3_bus_mode
176 |= SD_MODE_UHS_SDR104;
179 ret = mmc_io_rw_direct(card, 0, 0,
180 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
184 if (data & SDIO_DRIVE_SDTA)
185 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
186 if (data & SDIO_DRIVE_SDTC)
187 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
188 if (data & SDIO_DRIVE_SDTD)
189 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
192 /* if no uhs mode ensure we check for high speed */
193 if (!card->sw_caps.sd3_bus_mode) {
194 if (speed & SDIO_SPEED_SHS) {
195 card->cccr.high_speed = 1;
196 card->sw_caps.hs_max_dtr = 50000000;
198 card->cccr.high_speed = 0;
199 card->sw_caps.hs_max_dtr = 25000000;
208 static int sdio_enable_wide(struct mmc_card *card)
213 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
216 if (card->cccr.low_speed && !card->cccr.wide_bus)
219 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
223 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
224 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
225 mmc_hostname(card->host), ctrl);
227 /* set as 4-bit bus width */
228 ctrl &= ~SDIO_BUS_WIDTH_MASK;
229 ctrl |= SDIO_BUS_WIDTH_4BIT;
231 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
239 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
240 * of the card. This may be required on certain setups of boards,
241 * controllers and embedded sdio device which do not need the card's
242 * pull-up. As a result, card detection is disabled and power is saved.
244 static int sdio_disable_cd(struct mmc_card *card)
249 if (!mmc_card_disable_cd(card))
252 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
256 ctrl |= SDIO_BUS_CD_DISABLE;
258 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
262 * Devices that remain active during a system suspend are
263 * put back into 1-bit mode.
265 static int sdio_disable_wide(struct mmc_card *card)
270 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
273 if (card->cccr.low_speed && !card->cccr.wide_bus)
276 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
280 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
283 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
284 ctrl |= SDIO_BUS_ASYNC_INT;
286 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
290 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
296 static int sdio_enable_4bit_bus(struct mmc_card *card)
300 if (card->type == MMC_TYPE_SDIO)
301 return sdio_enable_wide(card);
303 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
304 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
305 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
311 err = sdio_enable_wide(card);
313 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
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_highspeed(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 host_drv_type = SD_DRIVER_TYPE_B;
408 int card_drv_type = SD_DRIVER_TYPE_B;
410 unsigned char card_strength;
414 * If the host doesn't support any of the Driver Types A,C or D,
415 * or there is no board specific handler then default Driver
418 if (!(card->host->caps &
419 (MMC_CAP_DRIVER_TYPE_A |
420 MMC_CAP_DRIVER_TYPE_C |
421 MMC_CAP_DRIVER_TYPE_D)))
424 if (!card->host->ops->select_drive_strength)
427 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
428 host_drv_type |= SD_DRIVER_TYPE_A;
430 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
431 host_drv_type |= SD_DRIVER_TYPE_C;
433 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
434 host_drv_type |= SD_DRIVER_TYPE_D;
436 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
437 card_drv_type |= SD_DRIVER_TYPE_A;
439 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
440 card_drv_type |= SD_DRIVER_TYPE_C;
442 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
443 card_drv_type |= SD_DRIVER_TYPE_D;
446 * The drive strength that the hardware can support
447 * depends on the board design. Pass the appropriate
448 * information and let the hardware specific code
449 * return what is possible given the options
451 drive_strength = card->host->ops->select_drive_strength(
452 card->sw_caps.uhs_max_dtr,
453 host_drv_type, card_drv_type);
455 /* if error just use default for drive strength B */
456 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
461 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
462 card_strength |= host_drive_to_sdio_drive(drive_strength);
464 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
465 card_strength, NULL);
467 /* if error default to drive strength B */
469 mmc_set_driver_type(card->host, drive_strength);
473 static int sdio_set_bus_speed_mode(struct mmc_card *card)
475 unsigned int bus_speed, timing;
480 * If the host doesn't support any of the UHS-I modes, fallback on
483 if (!mmc_host_uhs(card->host))
486 bus_speed = SDIO_SPEED_SDR12;
487 timing = MMC_TIMING_UHS_SDR12;
488 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
489 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
490 bus_speed = SDIO_SPEED_SDR104;
491 timing = MMC_TIMING_UHS_SDR104;
492 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
493 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
494 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
495 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
496 bus_speed = SDIO_SPEED_DDR50;
497 timing = MMC_TIMING_UHS_DDR50;
498 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
499 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
500 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
501 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
502 SD_MODE_UHS_SDR50)) {
503 bus_speed = SDIO_SPEED_SDR50;
504 timing = MMC_TIMING_UHS_SDR50;
505 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
506 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
507 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
508 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
509 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
510 bus_speed = SDIO_SPEED_SDR25;
511 timing = MMC_TIMING_UHS_SDR25;
512 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
513 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
514 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
515 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
516 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
517 SD_MODE_UHS_SDR12)) {
518 bus_speed = SDIO_SPEED_SDR12;
519 timing = MMC_TIMING_UHS_SDR12;
520 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
521 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
524 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
528 speed &= ~SDIO_SPEED_BSS_MASK;
530 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
535 mmc_set_timing(card->host, timing);
536 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
543 * UHS-I specific initialization procedure
545 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
549 if (!card->scr.sda_spec3)
553 * Switch to wider bus (if supported).
555 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
556 err = sdio_enable_4bit_bus(card);
558 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
563 /* Set the driver strength for the card */
564 sdio_select_driver_type(card);
566 /* Set bus speed mode of the card */
567 err = sdio_set_bus_speed_mode(card);
572 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
573 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
575 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
576 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
577 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104))) {
578 mmc_host_clk_hold(card->host);
579 err = card->host->ops->execute_tuning(card->host,
580 MMC_SEND_TUNING_BLOCK);
581 mmc_host_clk_release(card->host);
590 * Handle the detection and initialisation of a card.
592 * In the case of a resume, "oldcard" will contain the card
593 * we're trying to reinitialise.
595 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
596 struct mmc_card *oldcard, int powered_resume)
598 struct mmc_card *card;
605 WARN_ON(!host->claimed);
607 /* to query card if 1.8V signalling is supported */
608 if (mmc_host_uhs(host))
609 ocr |= R4_18V_PRESENT;
613 pr_warning("%s: Skipping voltage switch\n",
615 ocr &= ~R4_18V_PRESENT;
619 * Inform the card of the voltage
621 if (!powered_resume) {
622 err = mmc_send_io_op_cond(host, ocr, &rocr);
628 * For SPI, enable CRC as appropriate.
630 if (mmc_host_is_spi(host)) {
631 err = mmc_spi_set_crc(host, use_spi_crc);
637 * Allocate card structure.
639 card = mmc_alloc_card(host, NULL);
645 if ((rocr & R4_MEMORY_PRESENT) &&
646 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
647 card->type = MMC_TYPE_SD_COMBO;
649 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
650 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
651 mmc_remove_card(card);
655 card->type = MMC_TYPE_SDIO;
657 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
658 mmc_remove_card(card);
664 * Call the optional HC's init_card function to handle quirks.
666 if (host->ops->init_card)
667 host->ops->init_card(host, card);
670 * If the host and card support UHS-I mode request the card
671 * to switch to 1.8V signaling level. No 1.8v signalling if
672 * UHS mode is not enabled to maintain compatibility and some
673 * systems that claim 1.8v signalling in fact do not support
678 * Fixme: ap6335 should not set S18A=1 if mmc I/F voltage
681 #ifdef CONFIG_MMC_DW_ROCKCHIP_SWITCH_VOLTAGE
683 rocr &= ~R4_18V_PRESENT;
687 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
688 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
690 if (err == -EAGAIN) {
693 mmc_send_if_cond(host, host->ocr_avail);
694 mmc_remove_card(card);
698 ocr &= ~R4_18V_PRESENT;
702 #ifdef CONFIG_MMC_DW_ROCKCHIP_SWITCH_VOLTAGE
705 ocr &= ~R4_18V_PRESENT;
711 * For native busses: set card RCA and quit open drain mode.
713 if (!powered_resume && !mmc_host_is_spi(host)) {
714 err = mmc_send_relative_addr(host, &card->rca);
719 * Update oldcard with the new RCA received from the SDIO
720 * device -- we're doing this so that it's updated in the
721 * "card" struct when oldcard overwrites that later.
724 oldcard->rca = card->rca;
728 * Read CSD, before selecting the card
730 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
731 err = mmc_sd_get_csd(host, card);
735 mmc_decode_cid(card);
739 * Select card, as all following commands rely on that.
741 if (!powered_resume && !mmc_host_is_spi(host)) {
742 err = mmc_select_card(card);
747 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
749 * This is non-standard SDIO device, meaning it doesn't
750 * have any CIA (Common I/O area) registers present.
751 * It's host's responsibility to fill cccr and cis
752 * structures in init_card().
754 mmc_set_clock(host, card->cis.max_dtr);
756 if (card->cccr.high_speed) {
757 mmc_card_set_highspeed(card);
758 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
764 #ifdef CONFIG_MMC_EMBEDDED_SDIO
765 if (host->embedded_sdio_data.cccr)
766 memcpy(&card->cccr, host->embedded_sdio_data.cccr, sizeof(struct sdio_cccr));
770 * Read the common registers.
772 err = sdio_read_cccr(card, ocr);
775 #ifdef CONFIG_MMC_EMBEDDED_SDIO
779 #ifdef CONFIG_MMC_EMBEDDED_SDIO
780 if (host->embedded_sdio_data.cis)
781 memcpy(&card->cis, host->embedded_sdio_data.cis, sizeof(struct sdio_cis));
785 * Read the common CIS tuples.
787 err = sdio_read_common_cis(card);
790 #ifdef CONFIG_MMC_EMBEDDED_SDIO
795 int same = (card->cis.vendor == oldcard->cis.vendor &&
796 card->cis.device == oldcard->cis.device);
797 mmc_remove_card(card);
803 card->ocr = ocr_card;
804 mmc_fixup_device(card, NULL);
806 if (card->type == MMC_TYPE_SD_COMBO) {
807 err = mmc_sd_setup_card(host, card, oldcard != NULL);
808 /* handle as SDIO-only card if memory init failed */
811 if (mmc_host_is_spi(host))
812 /* should not fail, as it worked previously */
813 mmc_spi_set_crc(host, use_spi_crc);
814 card->type = MMC_TYPE_SDIO;
816 card->dev.type = &sd_type;
820 * If needed, disconnect card detection pull-up resistor.
822 err = sdio_disable_cd(card);
826 /* Initialization sequence for UHS-I cards */
827 /* Only if card supports 1.8v and UHS signaling */
828 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
829 err = mmc_sdio_init_uhs_card(card);
833 /* Card is an ultra-high-speed card */
834 mmc_card_set_uhs(card);
837 * Switch to high-speed (if supported).
839 err = sdio_enable_hs(card);
841 mmc_sd_go_highspeed(card);
846 * Change to the card's maximum speed.
848 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
851 * Switch to wider bus (if supported).
853 err = sdio_enable_4bit_bus(card);
855 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
866 mmc_remove_card(card);
873 * Host is being removed. Free up the current card.
875 static void mmc_sdio_remove(struct mmc_host *host)
882 for (i = 0;i < host->card->sdio_funcs;i++) {
883 if (host->card->sdio_func[i]) {
884 sdio_remove_func(host->card->sdio_func[i]);
885 host->card->sdio_func[i] = NULL;
889 mmc_remove_card(host->card);
894 * Card detection - card is alive.
896 static int mmc_sdio_alive(struct mmc_host *host)
898 return mmc_select_card(host->card);
902 * Card detection callback from host.
904 static void mmc_sdio_detect(struct mmc_host *host)
911 /* Make sure card is powered before detecting it */
912 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
913 err = pm_runtime_get_sync(&host->card->dev);
915 pm_runtime_put_noidle(&host->card->dev);
920 mmc_claim_host(host);
923 * Just check if our card has been removed.
925 err = _mmc_detect_card_removed(host);
927 mmc_release_host(host);
930 * Tell PM core it's OK to power off the card now.
932 * The _sync variant is used in order to ensure that the card
933 * is left powered off in case an error occurred, and the card
934 * is going to be removed.
936 * Since there is no specific reason to believe a new user
937 * is about to show up at this point, the _sync variant is
940 if (host->caps & MMC_CAP_POWER_OFF_CARD)
941 pm_runtime_put_sync(&host->card->dev);
945 mmc_sdio_remove(host);
947 mmc_claim_host(host);
948 mmc_detach_bus(host);
950 mmc_release_host(host);
955 * SDIO pre_suspend. We need to suspend all functions separately.
956 * Therefore all registered functions must have drivers with suspend
957 * and resume methods. Failing that we simply remove the whole card.
959 static int mmc_sdio_pre_suspend(struct mmc_host *host)
963 for (i = 0; i < host->card->sdio_funcs; i++) {
964 struct sdio_func *func = host->card->sdio_func[i];
965 if (func && sdio_func_present(func) && func->dev.driver) {
966 const struct dev_pm_ops *pmops = func->dev.driver->pm;
967 if (!pmops || !pmops->suspend || !pmops->resume) {
968 /* force removal of entire card in that case */
979 * SDIO suspend. Suspend all functions separately.
981 static int mmc_sdio_suspend(struct mmc_host *host)
985 for (i = 0; i < host->card->sdio_funcs; i++) {
986 struct sdio_func *func = host->card->sdio_func[i];
987 if (func && sdio_func_present(func) && func->dev.driver) {
988 const struct dev_pm_ops *pmops = func->dev.driver->pm;
989 err = pmops->suspend(&func->dev);
994 while (err && --i >= 0) {
995 struct sdio_func *func = host->card->sdio_func[i];
996 if (func && sdio_func_present(func) && func->dev.driver) {
997 const struct dev_pm_ops *pmops = func->dev.driver->pm;
998 pmops->resume(&func->dev);
1002 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1003 mmc_claim_host(host);
1004 sdio_disable_wide(host->card);
1005 mmc_release_host(host);
1008 if (!err && !mmc_card_keep_power(host))
1009 mmc_power_off(host);
1014 static int mmc_sdio_resume(struct mmc_host *host)
1019 BUG_ON(!host->card);
1021 /* Basic card reinitialization. */
1022 mmc_claim_host(host);
1024 /* Restore power if needed */
1025 if (!mmc_card_keep_power(host)) {
1026 mmc_power_up(host, host->card->ocr);
1028 * Tell runtime PM core we just powered up the card,
1029 * since it still believes the card is powered off.
1030 * Note that currently runtime PM is only enabled
1031 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1033 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1034 pm_runtime_disable(&host->card->dev);
1035 pm_runtime_set_active(&host->card->dev);
1036 pm_runtime_enable(&host->card->dev);
1040 /* No need to reinitialize powered-resumed nonremovable cards */
1041 // tmp modify for wifi abnormal after suspend (gwl)
1042 // mmc2: error -110 during resume (card was removed?)
1043 // dpm_run_callback(): mmc_bus_resume+0x0/0x78 returns -110
1044 // PM: Device mmc2:0001 failed to resume: error -110
1045 if (!(host->restrict_caps & RESTRICT_CARD_TYPE_SDIO) &&
1046 (mmc_card_is_removable(host) || !mmc_card_keep_power(host))) {
1049 err = mmc_sdio_init_card(host, host->card->ocr, host->card,
1050 mmc_card_keep_power(host));
1051 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1052 /* We may have switched to 1-bit mode during suspend */
1053 err = sdio_enable_4bit_bus(host->card);
1055 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1060 if (!err && host->sdio_irqs)
1061 wake_up_process(host->sdio_irq_thread);
1062 mmc_release_host(host);
1065 * If the card looked to be the same as before suspending, then
1066 * we proceed to resume all card functions. If one of them returns
1067 * an error then we simply return that error to the core and the
1068 * card will be redetected as new. It is the responsibility of
1069 * the function driver to perform further tests with the extra
1070 * knowledge it has of the card to confirm the card is indeed the
1071 * same as before suspending (same MAC address for network cards,
1072 * etc.) and return an error otherwise.
1074 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
1075 struct sdio_func *func = host->card->sdio_func[i];
1076 if (func && sdio_func_present(func) && func->dev.driver) {
1077 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1078 err = pmops->resume(&func->dev);
1082 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1086 static int mmc_sdio_power_restore(struct mmc_host *host)
1091 BUG_ON(!host->card);
1093 mmc_claim_host(host);
1096 * Reset the card by performing the same steps that are taken by
1097 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1099 * sdio_reset() is technically not needed. Having just powered up the
1100 * hardware, it should already be in reset state. However, some
1101 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1102 * meaning that a reset is required when restoring power soon after
1103 * powering off. It is harmless in other cases.
1105 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1106 * is not necessary for non-removable cards. However, it is required
1107 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1108 * harmless in other situations.
1114 mmc_send_if_cond(host, host->ocr_avail);
1116 ret = mmc_send_io_op_cond(host, 0, NULL);
1120 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1121 mmc_card_keep_power(host));
1122 if (!ret && host->sdio_irqs)
1123 mmc_signal_sdio_irq(host);
1126 mmc_release_host(host);
1131 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1133 /* No references to the card, cut the power to it. */
1134 mmc_power_off(host);
1138 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1140 /* Restore power and re-initialize. */
1141 mmc_power_up(host, host->card->ocr);
1142 return mmc_sdio_power_restore(host);
1145 static const struct mmc_bus_ops mmc_sdio_ops = {
1146 .remove = mmc_sdio_remove,
1147 .detect = mmc_sdio_detect,
1148 .pre_suspend = mmc_sdio_pre_suspend,
1149 .suspend = mmc_sdio_suspend,
1150 .resume = mmc_sdio_resume,
1151 .runtime_suspend = mmc_sdio_runtime_suspend,
1152 .runtime_resume = mmc_sdio_runtime_resume,
1153 .power_restore = mmc_sdio_power_restore,
1154 .alive = mmc_sdio_alive,
1159 * Starting point for SDIO card init.
1161 int mmc_attach_sdio(struct mmc_host *host)
1165 struct mmc_card *card;
1168 WARN_ON(!host->claimed);
1170 err = mmc_send_io_op_cond(host, 0, &ocr);
1174 mmc_attach_bus(host, &mmc_sdio_ops);
1175 if (host->ocr_avail_sdio)
1176 host->ocr_avail = host->ocr_avail_sdio;
1179 rocr = mmc_select_voltage(host, ocr);
1182 * Can we support the voltage(s) of the card(s)?
1190 * Detect and init the card.
1192 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1199 * Enable runtime PM only if supported by host+card+board
1201 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1203 * Let runtime PM core know our card is active
1205 err = pm_runtime_set_active(&card->dev);
1210 * Enable runtime PM for this card
1212 pm_runtime_enable(&card->dev);
1216 * The number of functions on the card is encoded inside
1219 funcs = (ocr & 0x70000000) >> 28;
1220 card->sdio_funcs = 0;
1222 #ifdef CONFIG_MMC_EMBEDDED_SDIO
1223 if (host->embedded_sdio_data.funcs)
1224 card->sdio_funcs = funcs = host->embedded_sdio_data.num_funcs;
1228 * Initialize (but don't add) all present functions.
1230 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1231 #ifdef CONFIG_MMC_EMBEDDED_SDIO
1232 if (host->embedded_sdio_data.funcs) {
1233 struct sdio_func *tmp;
1235 tmp = sdio_alloc_func(host->card);
1239 card->sdio_func[i] = tmp;
1240 tmp->class = host->embedded_sdio_data.funcs[i].f_class;
1241 tmp->max_blksize = host->embedded_sdio_data.funcs[i].f_maxblksize;
1242 tmp->vendor = card->cis.vendor;
1243 tmp->device = card->cis.device;
1246 err = sdio_init_func(host->card, i + 1);
1249 #ifdef CONFIG_MMC_EMBEDDED_SDIO
1253 * Enable Runtime PM for this func (if supported)
1255 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1256 pm_runtime_enable(&card->sdio_func[i]->dev);
1260 * First add the card to the driver model...
1262 mmc_release_host(host);
1263 err = mmc_add_card(host->card);
1268 * ...then the SDIO functions.
1270 for (i = 0;i < funcs;i++) {
1271 err = sdio_add_func(host->card->sdio_func[i]);
1276 mmc_claim_host(host);
1281 /* Remove without lock if the device has been added. */
1282 mmc_sdio_remove(host);
1283 mmc_claim_host(host);
1285 /* And with lock if it hasn't been added. */
1286 mmc_release_host(host);
1288 mmc_sdio_remove(host);
1289 mmc_claim_host(host);
1291 mmc_detach_bus(host);
1293 pr_err("%s: error %d whilst initialising SDIO card\n",
1294 mmc_hostname(host), err);
1300 int sdio_reset_comm(struct mmc_card *card)
1302 struct mmc_host *host = card->host;
1306 printk("%s():\n", __func__);
1307 mmc_claim_host(host);
1311 mmc_set_clock(host, host->f_min);
1313 err = mmc_send_io_op_cond(host, 0, &ocr);
1317 host->ocr_avail_sdio = mmc_select_voltage(host, ocr);
1318 if (!host->ocr_avail_sdio) {
1323 err = mmc_sdio_init_card(host, host->ocr_avail_sdio, card, 0);
1327 mmc_release_host(host);
1330 printk("%s: Error resetting SDIO communications (%d)\n",
1331 mmc_hostname(host), err);
1332 mmc_release_host(host);
1335 EXPORT_SYMBOL(sdio_reset_comm);