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/sdio.h>
18 #include <linux/mmc/sdio_func.h>
29 static int sdio_read_fbr(struct sdio_func *func)
34 ret = mmc_io_rw_direct(func->card, 0, 0,
35 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
42 ret = mmc_io_rw_direct(func->card, 0, 0,
43 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
54 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
57 struct sdio_func *func;
59 BUG_ON(fn > SDIO_MAX_FUNCS);
61 func = sdio_alloc_func(card);
67 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
68 ret = sdio_read_fbr(func);
72 ret = sdio_read_func_cis(func);
76 func->vendor = func->card->cis.vendor;
77 func->device = func->card->cis.device;
78 func->max_blksize = func->card->cis.blksize;
81 card->sdio_func[fn - 1] = func;
87 * It is okay to remove the function here even though we hold
88 * the host lock as we haven't registered the device yet.
90 sdio_remove_func(func);
94 static int sdio_read_cccr(struct mmc_card *card)
100 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
102 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
106 cccr_vsn = data & 0x0f;
108 if (cccr_vsn > SDIO_CCCR_REV_1_20) {
109 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
110 mmc_hostname(card->host), cccr_vsn);
114 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
116 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
120 if (data & SDIO_CCCR_CAP_SMB)
121 card->cccr.multi_block = 1;
122 if (data & SDIO_CCCR_CAP_LSC)
123 card->cccr.low_speed = 1;
124 if (data & SDIO_CCCR_CAP_4BLS)
125 card->cccr.wide_bus = 1;
127 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
128 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
132 if (data & SDIO_POWER_SMPC)
133 card->cccr.high_power = 1;
136 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
137 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
141 if (data & SDIO_SPEED_SHS)
142 card->cccr.high_speed = 1;
149 static int sdio_enable_wide(struct mmc_card *card)
154 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
157 if (card->cccr.low_speed && !card->cccr.wide_bus)
160 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
164 ctrl |= SDIO_BUS_WIDTH_4BIT;
166 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
174 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
175 * of the card. This may be required on certain setups of boards,
176 * controllers and embedded sdio device which do not need the card's
177 * pull-up. As a result, card detection is disabled and power is saved.
179 static int sdio_disable_cd(struct mmc_card *card)
184 if (!card->cccr.disable_cd)
187 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
191 ctrl |= SDIO_BUS_CD_DISABLE;
193 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
197 * Devices that remain active during a system suspend are
198 * put back into 1-bit mode.
200 static int sdio_disable_wide(struct mmc_card *card)
205 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
208 if (card->cccr.low_speed && !card->cccr.wide_bus)
211 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
215 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
218 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
219 ctrl |= SDIO_BUS_ASYNC_INT;
221 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
225 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
231 static int sdio_enable_4bit_bus(struct mmc_card *card)
235 if (card->type == MMC_TYPE_SDIO)
236 return sdio_enable_wide(card);
238 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
239 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
240 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
246 err = sdio_enable_wide(card);
248 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
255 * Test if the card supports high-speed mode and, if so, switch to it.
257 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
262 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
265 if (!card->cccr.high_speed)
268 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
273 speed |= SDIO_SPEED_EHS;
275 speed &= ~SDIO_SPEED_EHS;
277 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
285 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
287 static int sdio_enable_hs(struct mmc_card *card)
291 ret = mmc_sdio_switch_hs(card, true);
292 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
295 ret = mmc_sd_switch_hs(card);
297 mmc_sdio_switch_hs(card, false);
302 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
306 if (mmc_card_highspeed(card)) {
308 * The SDIO specification doesn't mention how
309 * the CIS transfer speed register relates to
310 * high-speed, but it seems that 50 MHz is
315 max_dtr = card->cis.max_dtr;
318 if (card->type == MMC_TYPE_SD_COMBO)
319 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
325 * Handle the detection and initialisation of a card.
327 * In the case of a resume, "oldcard" will contain the card
328 * we're trying to reinitialise.
330 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
331 struct mmc_card *oldcard, int powered_resume)
333 struct mmc_card *card;
337 WARN_ON(!host->claimed);
340 * Inform the card of the voltage
342 if (!powered_resume) {
343 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
349 * For SPI, enable CRC as appropriate.
351 if (mmc_host_is_spi(host)) {
352 err = mmc_spi_set_crc(host, use_spi_crc);
358 * Allocate card structure.
360 card = mmc_alloc_card(host, NULL);
366 if (ocr & R4_MEMORY_PRESENT
367 && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) == 0) {
368 card->type = MMC_TYPE_SD_COMBO;
370 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
371 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
372 mmc_remove_card(card);
376 card->type = MMC_TYPE_SDIO;
378 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
379 mmc_remove_card(card);
385 * Call the optional HC's init_card function to handle quirks.
387 if (host->ops->init_card)
388 host->ops->init_card(host, card);
391 * For native busses: set card RCA and quit open drain mode.
393 if (!powered_resume && !mmc_host_is_spi(host)) {
394 err = mmc_send_relative_addr(host, &card->rca);
398 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
402 * Read CSD, before selecting the card
404 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
405 err = mmc_sd_get_csd(host, card);
409 mmc_decode_cid(card);
413 * Select card, as all following commands rely on that.
415 if (!powered_resume && !mmc_host_is_spi(host)) {
416 err = mmc_select_card(card);
421 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
423 * This is non-standard SDIO device, meaning it doesn't
424 * have any CIA (Common I/O area) registers present.
425 * It's host's responsibility to fill cccr and cis
426 * structures in init_card().
428 mmc_set_clock(host, card->cis.max_dtr);
430 if (card->cccr.high_speed) {
431 mmc_card_set_highspeed(card);
432 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
439 * Read the common registers.
441 err = sdio_read_cccr(card);
446 * Read the common CIS tuples.
448 err = sdio_read_common_cis(card);
453 int same = (card->cis.vendor == oldcard->cis.vendor &&
454 card->cis.device == oldcard->cis.device);
455 mmc_remove_card(card);
462 if (card->type == MMC_TYPE_SD_COMBO) {
463 err = mmc_sd_setup_card(host, card, oldcard != NULL);
464 /* handle as SDIO-only card if memory init failed */
467 if (mmc_host_is_spi(host))
468 /* should not fail, as it worked previously */
469 mmc_spi_set_crc(host, use_spi_crc);
470 card->type = MMC_TYPE_SDIO;
472 card->dev.type = &sd_type;
476 * If needed, disconnect card detection pull-up resistor.
478 err = sdio_disable_cd(card);
483 * Switch to high-speed (if supported).
485 err = sdio_enable_hs(card);
487 mmc_sd_go_highspeed(card);
492 * Change to the card's maximum speed.
494 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
497 * Switch to wider bus (if supported).
499 err = sdio_enable_4bit_bus(card);
501 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
512 mmc_remove_card(card);
519 * Host is being removed. Free up the current card.
521 static void mmc_sdio_remove(struct mmc_host *host)
528 for (i = 0;i < host->card->sdio_funcs;i++) {
529 if (host->card->sdio_func[i]) {
530 sdio_remove_func(host->card->sdio_func[i]);
531 host->card->sdio_func[i] = NULL;
535 mmc_remove_card(host->card);
540 * Card detection callback from host.
542 static void mmc_sdio_detect(struct mmc_host *host)
549 /* Make sure card is powered before detecting it */
550 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
551 err = pm_runtime_get_sync(&host->card->dev);
556 mmc_claim_host(host);
559 * Just check if our card has been removed.
561 err = mmc_select_card(host->card);
563 mmc_release_host(host);
566 * Tell PM core it's OK to power off the card now.
568 * The _sync variant is used in order to ensure that the card
569 * is left powered off in case an error occurred, and the card
570 * is going to be removed.
572 * Since there is no specific reason to believe a new user
573 * is about to show up at this point, the _sync variant is
576 if (host->caps & MMC_CAP_POWER_OFF_CARD)
577 pm_runtime_put_sync(&host->card->dev);
581 mmc_sdio_remove(host);
583 mmc_claim_host(host);
584 mmc_detach_bus(host);
585 mmc_release_host(host);
590 * SDIO suspend. We need to suspend all functions separately.
591 * Therefore all registered functions must have drivers with suspend
592 * and resume methods. Failing that we simply remove the whole card.
594 static int mmc_sdio_suspend(struct mmc_host *host)
598 for (i = 0; i < host->card->sdio_funcs; i++) {
599 struct sdio_func *func = host->card->sdio_func[i];
600 if (func && sdio_func_present(func) && func->dev.driver) {
601 const struct dev_pm_ops *pmops = func->dev.driver->pm;
602 if (!pmops || !pmops->suspend || !pmops->resume) {
603 /* force removal of entire card in that case */
606 err = pmops->suspend(&func->dev);
611 while (err && --i >= 0) {
612 struct sdio_func *func = host->card->sdio_func[i];
613 if (func && sdio_func_present(func) && func->dev.driver) {
614 const struct dev_pm_ops *pmops = func->dev.driver->pm;
615 pmops->resume(&func->dev);
619 if (!err && host->pm_flags & MMC_PM_KEEP_POWER) {
620 mmc_claim_host(host);
621 sdio_disable_wide(host->card);
622 mmc_release_host(host);
628 static int mmc_sdio_resume(struct mmc_host *host)
635 /* Basic card reinitialization. */
636 mmc_claim_host(host);
637 err = mmc_sdio_init_card(host, host->ocr, host->card,
638 (host->pm_flags & MMC_PM_KEEP_POWER));
639 if (!err && host->sdio_irqs)
640 mmc_signal_sdio_irq(host);
641 mmc_release_host(host);
644 * If the card looked to be the same as before suspending, then
645 * we proceed to resume all card functions. If one of them returns
646 * an error then we simply return that error to the core and the
647 * card will be redetected as new. It is the responsibility of
648 * the function driver to perform further tests with the extra
649 * knowledge it has of the card to confirm the card is indeed the
650 * same as before suspending (same MAC address for network cards,
651 * etc.) and return an error otherwise.
653 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
654 struct sdio_func *func = host->card->sdio_func[i];
655 if (func && sdio_func_present(func) && func->dev.driver) {
656 const struct dev_pm_ops *pmops = func->dev.driver->pm;
657 err = pmops->resume(&func->dev);
664 static int mmc_sdio_power_restore(struct mmc_host *host)
671 mmc_claim_host(host);
672 ret = mmc_sdio_init_card(host, host->ocr, host->card,
673 (host->pm_flags & MMC_PM_KEEP_POWER));
674 if (!ret && host->sdio_irqs)
675 mmc_signal_sdio_irq(host);
676 mmc_release_host(host);
681 static const struct mmc_bus_ops mmc_sdio_ops = {
682 .remove = mmc_sdio_remove,
683 .detect = mmc_sdio_detect,
684 .suspend = mmc_sdio_suspend,
685 .resume = mmc_sdio_resume,
686 .power_restore = mmc_sdio_power_restore,
691 * Starting point for SDIO card init.
693 int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
697 struct mmc_card *card;
700 WARN_ON(!host->claimed);
702 mmc_attach_bus(host, &mmc_sdio_ops);
705 * Sanity check the voltages that the card claims to
709 printk(KERN_WARNING "%s: card claims to support voltages "
710 "below the defined range. These will be ignored.\n",
715 host->ocr = mmc_select_voltage(host, ocr);
718 * Can we support the voltage(s) of the card(s)?
726 * Detect and init the card.
728 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
734 * Enable runtime PM only if supported by host+card+board
736 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
738 * Let runtime PM core know our card is active
740 err = pm_runtime_set_active(&card->dev);
745 * Enable runtime PM for this card
747 pm_runtime_enable(&card->dev);
751 * The number of functions on the card is encoded inside
754 funcs = (ocr & 0x70000000) >> 28;
755 card->sdio_funcs = 0;
758 * Initialize (but don't add) all present functions.
760 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
761 err = sdio_init_func(host->card, i + 1);
766 * Enable Runtime PM for this func (if supported)
768 if (host->caps & MMC_CAP_POWER_OFF_CARD)
769 pm_runtime_enable(&card->sdio_func[i]->dev);
772 mmc_release_host(host);
775 * First add the card to the driver model...
777 err = mmc_add_card(host->card);
782 * ...then the SDIO functions.
784 for (i = 0;i < funcs;i++) {
785 err = sdio_add_func(host->card->sdio_func[i]);
794 /* Remove without lock if the device has been added. */
795 mmc_sdio_remove(host);
796 mmc_claim_host(host);
798 /* And with lock if it hasn't been added. */
800 mmc_sdio_remove(host);
802 mmc_detach_bus(host);
803 mmc_release_host(host);
805 printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
806 mmc_hostname(host), err);