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
;
447 unsigned int max_rate
;
450 * If the host doesn't support any of the UHS-I modes, fallback on
453 if (!mmc_host_uhs(card
->host
))
456 bus_speed
= SDIO_SPEED_SDR12
;
457 timing
= MMC_TIMING_UHS_SDR12
;
458 if ((card
->host
->caps
& MMC_CAP_UHS_SDR104
) &&
459 (card
->sw_caps
.sd3_bus_mode
& SD_MODE_UHS_SDR104
)) {
460 bus_speed
= SDIO_SPEED_SDR104
;
461 timing
= MMC_TIMING_UHS_SDR104
;
462 card
->sw_caps
.uhs_max_dtr
= UHS_SDR104_MAX_DTR
;
463 card
->sd_bus_speed
= UHS_SDR104_BUS_SPEED
;
464 } else if ((card
->host
->caps
& MMC_CAP_UHS_DDR50
) &&
465 (card
->sw_caps
.sd3_bus_mode
& SD_MODE_UHS_DDR50
)) {
466 bus_speed
= SDIO_SPEED_DDR50
;
467 timing
= MMC_TIMING_UHS_DDR50
;
468 card
->sw_caps
.uhs_max_dtr
= UHS_DDR50_MAX_DTR
;
469 card
->sd_bus_speed
= UHS_DDR50_BUS_SPEED
;
470 } else if ((card
->host
->caps
& (MMC_CAP_UHS_SDR104
|
471 MMC_CAP_UHS_SDR50
)) && (card
->sw_caps
.sd3_bus_mode
&
472 SD_MODE_UHS_SDR50
)) {
473 bus_speed
= SDIO_SPEED_SDR50
;
474 timing
= MMC_TIMING_UHS_SDR50
;
475 card
->sw_caps
.uhs_max_dtr
= UHS_SDR50_MAX_DTR
;
476 card
->sd_bus_speed
= UHS_SDR50_BUS_SPEED
;
477 } else if ((card
->host
->caps
& (MMC_CAP_UHS_SDR104
|
478 MMC_CAP_UHS_SDR50
| MMC_CAP_UHS_SDR25
)) &&
479 (card
->sw_caps
.sd3_bus_mode
& SD_MODE_UHS_SDR25
)) {
480 bus_speed
= SDIO_SPEED_SDR25
;
481 timing
= MMC_TIMING_UHS_SDR25
;
482 card
->sw_caps
.uhs_max_dtr
= UHS_SDR25_MAX_DTR
;
483 card
->sd_bus_speed
= UHS_SDR25_BUS_SPEED
;
484 } else if ((card
->host
->caps
& (MMC_CAP_UHS_SDR104
|
485 MMC_CAP_UHS_SDR50
| MMC_CAP_UHS_SDR25
|
486 MMC_CAP_UHS_SDR12
)) && (card
->sw_caps
.sd3_bus_mode
&
487 SD_MODE_UHS_SDR12
)) {
488 bus_speed
= SDIO_SPEED_SDR12
;
489 timing
= MMC_TIMING_UHS_SDR12
;
490 card
->sw_caps
.uhs_max_dtr
= UHS_SDR12_MAX_DTR
;
491 card
->sd_bus_speed
= UHS_SDR12_BUS_SPEED
;
494 err
= mmc_io_rw_direct(card
, 0, 0, SDIO_CCCR_SPEED
, 0, &speed
);
498 speed
&= ~SDIO_SPEED_BSS_MASK
;
500 err
= mmc_io_rw_direct(card
, 1, 0, SDIO_CCCR_SPEED
, speed
, NULL
);
504 max_rate
= min_not_zero(card
->quirk_max_rate
,
505 card
->sw_caps
.uhs_max_dtr
);
508 mmc_set_timing(card
->host
, timing
);
509 mmc_set_clock(card
->host
, max_rate
);
516 * UHS-I specific initialization procedure
518 static int mmc_sdio_init_uhs_card(struct mmc_card
*card
)
522 if (!card
->scr
.sda_spec3
)
525 /* Switch to wider bus */
526 err
= sdio_enable_4bit_bus(card
);
530 /* Set the driver strength for the card */
531 sdio_select_driver_type(card
);
533 /* Set bus speed mode of the card */
534 err
= sdio_set_bus_speed_mode(card
);
539 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
540 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
542 if (!mmc_host_is_spi(card
->host
) &&
543 ((card
->host
->ios
.timing
== MMC_TIMING_UHS_SDR50
) ||
544 (card
->host
->ios
.timing
== MMC_TIMING_UHS_SDR104
)))
545 err
= mmc_execute_tuning(card
);
550 static void mmc_sdio_resend_if_cond(struct mmc_host
*host
,
551 struct mmc_card
*card
)
555 mmc_send_if_cond(host
, host
->ocr_avail
);
556 mmc_remove_card(card
);
560 * Handle the detection and initialisation of a card.
562 * In the case of a resume, "oldcard" will contain the card
563 * we're trying to reinitialise.
565 static int mmc_sdio_init_card(struct mmc_host
*host
, u32 ocr
,
566 struct mmc_card
*oldcard
, int powered_resume
)
568 struct mmc_card
*card
;
574 WARN_ON(!host
->claimed
);
576 /* to query card if 1.8V signalling is supported */
577 if (mmc_host_uhs(host
))
578 ocr
|= R4_18V_PRESENT
;
582 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host
));
583 ocr
&= ~R4_18V_PRESENT
;
587 * Inform the card of the voltage
589 if (!powered_resume
) {
590 err
= mmc_send_io_op_cond(host
, ocr
, &rocr
);
596 * For SPI, enable CRC as appropriate.
598 if (mmc_host_is_spi(host
)) {
599 err
= mmc_spi_set_crc(host
, use_spi_crc
);
605 * Allocate card structure.
607 card
= mmc_alloc_card(host
, NULL
);
613 if ((rocr
& R4_MEMORY_PRESENT
) &&
614 mmc_sd_get_cid(host
, ocr
& rocr
, card
->raw_cid
, NULL
) == 0) {
615 card
->type
= MMC_TYPE_SD_COMBO
;
617 if (oldcard
&& (oldcard
->type
!= MMC_TYPE_SD_COMBO
||
618 memcmp(card
->raw_cid
, oldcard
->raw_cid
, sizeof(card
->raw_cid
)) != 0)) {
619 mmc_remove_card(card
);
620 pr_debug("%s: Perhaps the card was replaced\n",
625 card
->type
= MMC_TYPE_SDIO
;
627 if (oldcard
&& oldcard
->type
!= MMC_TYPE_SDIO
) {
628 mmc_remove_card(card
);
629 pr_debug("%s: Perhaps the card was replaced\n",
636 * Call the optional HC's init_card function to handle quirks.
638 if (host
->ops
->init_card
)
639 host
->ops
->init_card(host
, card
);
642 * If the host and card support UHS-I mode request the card
643 * to switch to 1.8V signaling level. No 1.8v signalling if
644 * UHS mode is not enabled to maintain compatibility and some
645 * systems that claim 1.8v signalling in fact do not support
646 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
647 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
648 * fails to check rocr & R4_18V_PRESENT, but we still need to
649 * try to init uhs card. sdio_read_cccr will take over this task
650 * to make sure which speed mode should work.
652 if (!powered_resume
&& (rocr
& ocr
& R4_18V_PRESENT
)) {
653 err
= mmc_set_uhs_voltage(host
, ocr_card
);
654 if (err
== -EAGAIN
) {
655 mmc_sdio_resend_if_cond(host
, card
);
659 ocr
&= ~R4_18V_PRESENT
;
664 * For native busses: set card RCA and quit open drain mode.
666 if (!powered_resume
&& !mmc_host_is_spi(host
)) {
667 err
= mmc_send_relative_addr(host
, &card
->rca
);
672 * Update oldcard with the new RCA received from the SDIO
673 * device -- we're doing this so that it's updated in the
674 * "card" struct when oldcard overwrites that later.
677 oldcard
->rca
= card
->rca
;
681 * Read CSD, before selecting the card
683 if (!oldcard
&& card
->type
== MMC_TYPE_SD_COMBO
) {
684 err
= mmc_sd_get_csd(host
, card
);
688 mmc_decode_cid(card
);
692 * Select card, as all following commands rely on that.
694 if (!powered_resume
&& !mmc_host_is_spi(host
)) {
695 err
= mmc_select_card(card
);
700 if (card
->quirks
& MMC_QUIRK_NONSTD_SDIO
) {
702 * This is non-standard SDIO device, meaning it doesn't
703 * have any CIA (Common I/O area) registers present.
704 * It's host's responsibility to fill cccr and cis
705 * structures in init_card().
707 mmc_set_clock(host
, card
->cis
.max_dtr
);
709 if (card
->cccr
.high_speed
) {
710 mmc_set_timing(card
->host
, MMC_TIMING_SD_HS
);
717 * Read the common registers. Note that we should try to
718 * validate whether UHS would work or not.
720 err
= sdio_read_cccr(card
, ocr
);
722 mmc_sdio_resend_if_cond(host
, card
);
723 if (ocr
& R4_18V_PRESENT
) {
724 /* Retry init sequence, but without R4_18V_PRESENT. */
733 * Read the common CIS tuples.
735 err
= sdio_read_common_cis(card
);
740 int same
= (card
->cis
.vendor
== oldcard
->cis
.vendor
&&
741 card
->cis
.device
== oldcard
->cis
.device
);
742 mmc_remove_card(card
);
744 pr_debug("%s: Perhaps the card was replaced\n",
751 card
->ocr
= ocr_card
;
752 mmc_fixup_device(card
, sdio_fixup_methods
);
754 if (card
->type
== MMC_TYPE_SD_COMBO
) {
755 err
= mmc_sd_setup_card(host
, card
, oldcard
!= NULL
);
756 /* handle as SDIO-only card if memory init failed */
759 if (mmc_host_is_spi(host
))
760 /* should not fail, as it worked previously */
761 mmc_spi_set_crc(host
, use_spi_crc
);
762 card
->type
= MMC_TYPE_SDIO
;
764 card
->dev
.type
= &sd_type
;
768 * If needed, disconnect card detection pull-up resistor.
770 err
= sdio_disable_cd(card
);
774 /* Initialization sequence for UHS-I cards */
775 /* Only if card supports 1.8v and UHS signaling */
776 if ((ocr
& R4_18V_PRESENT
) && card
->sw_caps
.sd3_bus_mode
) {
777 err
= mmc_sdio_init_uhs_card(card
);
782 * Switch to high-speed (if supported).
784 err
= sdio_enable_hs(card
);
786 mmc_set_timing(card
->host
, MMC_TIMING_SD_HS
);
791 * Change to the card's maximum speed.
793 mmc_set_clock(host
, mmc_sdio_get_max_clock(card
));
796 * Switch to wider bus (if supported).
798 err
= sdio_enable_4bit_bus(card
);
803 if (host
->caps2
& MMC_CAP2_AVOID_3_3V
&&
804 host
->ios
.signal_voltage
== MMC_SIGNAL_VOLTAGE_330
) {
805 pr_err("%s: Host failed to negotiate down from 3.3V\n",
817 mmc_remove_card(card
);
823 static int mmc_sdio_reinit_card(struct mmc_host
*host
, bool powered_resume
)
829 mmc_send_if_cond(host
, host
->card
->ocr
);
831 ret
= mmc_send_io_op_cond(host
, 0, NULL
);
835 return mmc_sdio_init_card(host
, host
->card
->ocr
, host
->card
,
840 * Host is being removed. Free up the current card.
842 static void mmc_sdio_remove(struct mmc_host
*host
)
846 for (i
= 0;i
< host
->card
->sdio_funcs
;i
++) {
847 if (host
->card
->sdio_func
[i
]) {
848 sdio_remove_func(host
->card
->sdio_func
[i
]);
849 host
->card
->sdio_func
[i
] = NULL
;
853 mmc_remove_card(host
->card
);
858 * Card detection - card is alive.
860 static int mmc_sdio_alive(struct mmc_host
*host
)
862 return mmc_select_card(host
->card
);
866 * Card detection callback from host.
868 static void mmc_sdio_detect(struct mmc_host
*host
)
872 /* Make sure card is powered before detecting it */
873 if (host
->caps
& MMC_CAP_POWER_OFF_CARD
) {
874 err
= pm_runtime_get_sync(&host
->card
->dev
);
876 pm_runtime_put_noidle(&host
->card
->dev
);
881 mmc_claim_host(host
);
884 * Just check if our card has been removed.
886 err
= _mmc_detect_card_removed(host
);
888 mmc_release_host(host
);
891 * Tell PM core it's OK to power off the card now.
893 * The _sync variant is used in order to ensure that the card
894 * is left powered off in case an error occurred, and the card
895 * is going to be removed.
897 * Since there is no specific reason to believe a new user
898 * is about to show up at this point, the _sync variant is
901 if (host
->caps
& MMC_CAP_POWER_OFF_CARD
)
902 pm_runtime_put_sync(&host
->card
->dev
);
906 mmc_sdio_remove(host
);
908 mmc_claim_host(host
);
909 mmc_detach_bus(host
);
911 mmc_release_host(host
);
916 * SDIO pre_suspend. We need to suspend all functions separately.
917 * Therefore all registered functions must have drivers with suspend
918 * and resume methods. Failing that we simply remove the whole card.
920 static int mmc_sdio_pre_suspend(struct mmc_host
*host
)
924 for (i
= 0; i
< host
->card
->sdio_funcs
; i
++) {
925 struct sdio_func
*func
= host
->card
->sdio_func
[i
];
926 if (func
&& sdio_func_present(func
) && func
->dev
.driver
) {
927 const struct dev_pm_ops
*pmops
= func
->dev
.driver
->pm
;
928 if (!pmops
|| !pmops
->suspend
|| !pmops
->resume
) {
929 /* force removal of entire card in that case */
940 * SDIO suspend. Suspend all functions separately.
942 static int mmc_sdio_suspend(struct mmc_host
*host
)
944 mmc_claim_host(host
);
946 if (mmc_card_keep_power(host
) && mmc_card_wake_sdio_irq(host
))
947 sdio_disable_wide(host
->card
);
949 if (!mmc_card_keep_power(host
)) {
951 } else if (host
->retune_period
) {
952 mmc_retune_timer_stop(host
);
953 mmc_retune_needed(host
);
956 mmc_release_host(host
);
961 static int mmc_sdio_resume(struct mmc_host
*host
)
965 /* Basic card reinitialization. */
966 mmc_claim_host(host
);
968 /* Restore power if needed */
969 if (!mmc_card_keep_power(host
)) {
970 mmc_power_up(host
, host
->card
->ocr
);
972 * Tell runtime PM core we just powered up the card,
973 * since it still believes the card is powered off.
974 * Note that currently runtime PM is only enabled
975 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
977 if (host
->caps
& MMC_CAP_POWER_OFF_CARD
) {
978 pm_runtime_disable(&host
->card
->dev
);
979 pm_runtime_set_active(&host
->card
->dev
);
980 pm_runtime_enable(&host
->card
->dev
);
984 /* No need to reinitialize powered-resumed nonremovable cards */
985 if (mmc_card_is_removable(host
) || !mmc_card_keep_power(host
)) {
986 err
= mmc_sdio_reinit_card(host
, mmc_card_keep_power(host
));
987 } else if (mmc_card_keep_power(host
) && mmc_card_wake_sdio_irq(host
)) {
988 /* We may have switched to 1-bit mode during suspend */
989 err
= sdio_enable_4bit_bus(host
->card
);
992 if (!err
&& host
->sdio_irqs
) {
993 if (!(host
->caps2
& MMC_CAP2_SDIO_IRQ_NOTHREAD
))
994 wake_up_process(host
->sdio_irq_thread
);
995 else if (host
->caps
& MMC_CAP_SDIO_IRQ
)
996 host
->ops
->enable_sdio_irq(host
, 1);
999 mmc_release_host(host
);
1001 host
->pm_flags
&= ~MMC_PM_KEEP_POWER
;
1005 static int mmc_sdio_power_restore(struct mmc_host
*host
)
1010 * Reset the card by performing the same steps that are taken by
1011 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1013 * sdio_reset() is technically not needed. Having just powered up the
1014 * hardware, it should already be in reset state. However, some
1015 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1016 * meaning that a reset is required when restoring power soon after
1017 * powering off. It is harmless in other cases.
1019 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1020 * is not necessary for non-removable cards. However, it is required
1021 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1022 * harmless in other situations.
1026 mmc_claim_host(host
);
1028 ret
= mmc_sdio_reinit_card(host
, mmc_card_keep_power(host
));
1029 if (!ret
&& host
->sdio_irqs
)
1030 mmc_signal_sdio_irq(host
);
1032 mmc_release_host(host
);
1037 static int mmc_sdio_runtime_suspend(struct mmc_host
*host
)
1039 /* No references to the card, cut the power to it. */
1040 mmc_claim_host(host
);
1041 mmc_power_off(host
);
1042 mmc_release_host(host
);
1047 static int mmc_sdio_runtime_resume(struct mmc_host
*host
)
1051 /* Restore power and re-initialize. */
1052 mmc_claim_host(host
);
1053 mmc_power_up(host
, host
->card
->ocr
);
1054 ret
= mmc_sdio_power_restore(host
);
1055 mmc_release_host(host
);
1060 static int mmc_sdio_hw_reset(struct mmc_host
*host
)
1062 mmc_power_cycle(host
, host
->card
->ocr
);
1063 return mmc_sdio_power_restore(host
);
1066 static int mmc_sdio_sw_reset(struct mmc_host
*host
)
1068 mmc_set_clock(host
, host
->f_init
);
1072 mmc_set_initial_state(host
);
1073 mmc_set_initial_signal_voltage(host
);
1075 return mmc_sdio_reinit_card(host
, 0);
1078 static const struct mmc_bus_ops mmc_sdio_ops
= {
1079 .remove
= mmc_sdio_remove
,
1080 .detect
= mmc_sdio_detect
,
1081 .pre_suspend
= mmc_sdio_pre_suspend
,
1082 .suspend
= mmc_sdio_suspend
,
1083 .resume
= mmc_sdio_resume
,
1084 .runtime_suspend
= mmc_sdio_runtime_suspend
,
1085 .runtime_resume
= mmc_sdio_runtime_resume
,
1086 .alive
= mmc_sdio_alive
,
1087 .hw_reset
= mmc_sdio_hw_reset
,
1088 .sw_reset
= mmc_sdio_sw_reset
,
1093 * Starting point for SDIO card init.
1095 int mmc_attach_sdio(struct mmc_host
*host
)
1099 struct mmc_card
*card
;
1101 WARN_ON(!host
->claimed
);
1103 err
= mmc_send_io_op_cond(host
, 0, &ocr
);
1107 mmc_attach_bus(host
, &mmc_sdio_ops
);
1108 if (host
->ocr_avail_sdio
)
1109 host
->ocr_avail
= host
->ocr_avail_sdio
;
1112 rocr
= mmc_select_voltage(host
, ocr
);
1115 * Can we support the voltage(s) of the card(s)?
1123 * Detect and init the card.
1125 err
= mmc_sdio_init_card(host
, rocr
, NULL
, 0);
1132 * Enable runtime PM only if supported by host+card+board
1134 if (host
->caps
& MMC_CAP_POWER_OFF_CARD
) {
1136 * Do not allow runtime suspend until after SDIO function
1137 * devices are added.
1139 pm_runtime_get_noresume(&card
->dev
);
1142 * Let runtime PM core know our card is active
1144 err
= pm_runtime_set_active(&card
->dev
);
1149 * Enable runtime PM for this card
1151 pm_runtime_enable(&card
->dev
);
1155 * The number of functions on the card is encoded inside
1158 funcs
= (ocr
& 0x70000000) >> 28;
1159 card
->sdio_funcs
= 0;
1162 * Initialize (but don't add) all present functions.
1164 for (i
= 0; i
< funcs
; i
++, card
->sdio_funcs
++) {
1165 err
= sdio_init_func(host
->card
, i
+ 1);
1170 * Enable Runtime PM for this func (if supported)
1172 if (host
->caps
& MMC_CAP_POWER_OFF_CARD
)
1173 pm_runtime_enable(&card
->sdio_func
[i
]->dev
);
1177 * First add the card to the driver model...
1179 mmc_release_host(host
);
1180 err
= mmc_add_card(host
->card
);
1185 * ...then the SDIO functions.
1187 for (i
= 0;i
< funcs
;i
++) {
1188 err
= sdio_add_func(host
->card
->sdio_func
[i
]);
1193 if (host
->caps
& MMC_CAP_POWER_OFF_CARD
)
1194 pm_runtime_put(&card
->dev
);
1196 mmc_claim_host(host
);
1201 mmc_release_host(host
);
1204 * The devices are being deleted so it is not necessary to disable
1205 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1206 * because it needs to be active to remove any function devices that
1207 * were probed, and after that it gets deleted.
1209 mmc_sdio_remove(host
);
1210 mmc_claim_host(host
);
1212 mmc_detach_bus(host
);
1214 pr_err("%s: error %d whilst initialising SDIO card\n",
1215 mmc_hostname(host
), err
);