[deliverable/linux.git] / drivers / mmc / core / host.c

/*
 *  linux/drivers/mmc/core/host.c
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *  Copyright (C) 2007-2008 Pierre Ossman
 *  Copyright (C) 2010 Linus Walleij
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  MMC host class device management
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/idr.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/pagemap.h>
#include <linux/export.h>
#include <linux/leds.h>
#include <linux/slab.h>

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/slot-gpio.h>

#include "core.h"
#include "host.h"
#include "slot-gpio.h"
#include "pwrseq.h"

#define cls_dev_to_mmc_host(d)	container_of(d, struct mmc_host, class_dev)

static DEFINE_IDA(mmc_host_ida);
static DEFINE_SPINLOCK(mmc_host_lock);

static void mmc_host_classdev_release(struct device *dev)
{
	struct mmc_host *host = cls_dev_to_mmc_host(dev);
	spin_lock(&mmc_host_lock);
	ida_remove(&mmc_host_ida, host->index);
	spin_unlock(&mmc_host_lock);
	kfree(host);
}

static struct class mmc_host_class = {
	.name		= "mmc_host",
	.dev_release	= mmc_host_classdev_release,
};

int mmc_register_host_class(void)
{
	return class_register(&mmc_host_class);
}

void mmc_unregister_host_class(void)
{
	class_unregister(&mmc_host_class);
}

void mmc_retune_enable(struct mmc_host *host)
{
	host->can_retune = 1;
	if (host->retune_period)
		mod_timer(&host->retune_timer,
			  jiffies + host->retune_period * HZ);
}

/*
 * Pause re-tuning for a small set of operations.  The pause begins after the
 * next command and after first doing re-tuning.
 */
void mmc_retune_pause(struct mmc_host *host)
{
	if (!host->retune_paused) {
		host->retune_paused = 1;
		mmc_retune_needed(host);
		mmc_retune_hold(host);
	}
}
EXPORT_SYMBOL(mmc_retune_pause);

void mmc_retune_unpause(struct mmc_host *host)
{
	if (host->retune_paused) {
		host->retune_paused = 0;
		mmc_retune_release(host);
	}
}
EXPORT_SYMBOL(mmc_retune_unpause);

void mmc_retune_disable(struct mmc_host *host)
{
	mmc_retune_unpause(host);
	host->can_retune = 0;
	del_timer_sync(&host->retune_timer);
	host->retune_now = 0;
	host->need_retune = 0;
}

void mmc_retune_timer_stop(struct mmc_host *host)
{
	del_timer_sync(&host->retune_timer);
}
EXPORT_SYMBOL(mmc_retune_timer_stop);

void mmc_retune_hold(struct mmc_host *host)
{
	if (!host->hold_retune)
		host->retune_now = 1;
	host->hold_retune += 1;
}

void mmc_retune_release(struct mmc_host *host)
{
	if (host->hold_retune)
		host->hold_retune -= 1;
	else
		WARN_ON(1);
}

int mmc_retune(struct mmc_host *host)
{
	bool return_to_hs400 = false;
	int err;

	if (host->retune_now)
		host->retune_now = 0;
	else
		return 0;

	if (!host->need_retune || host->doing_retune || !host->card)
		return 0;

	host->need_retune = 0;

	host->doing_retune = 1;

	if (host->ios.timing == MMC_TIMING_MMC_HS400) {
		err = mmc_hs400_to_hs200(host->card);
		if (err)
			goto out;

		return_to_hs400 = true;

		if (host->ops->prepare_hs400_tuning)
			host->ops->prepare_hs400_tuning(host, &host->ios);
	}

	err = mmc_execute_tuning(host->card);
	if (err)
		goto out;

	if (return_to_hs400)
		err = mmc_hs200_to_hs400(host->card);
out:
	host->doing_retune = 0;

	return err;
}

static void mmc_retune_timer(unsigned long data)
{
	struct mmc_host *host = (struct mmc_host *)data;

	mmc_retune_needed(host);
}

/**
 *	mmc_of_parse() - parse host's device-tree node
 *	@host: host whose node should be parsed.
 *
 * To keep the rest of the MMC subsystem unaware of whether DT has been
 * used to to instantiate and configure this host instance or not, we
 * parse the properties and set respective generic mmc-host flags and
 * parameters.
 */
int mmc_of_parse(struct mmc_host *host)
{
	struct device_node *np;
	u32 bus_width;
	int ret;
	bool cd_cap_invert, cd_gpio_invert = false;
	bool ro_cap_invert, ro_gpio_invert = false;

	if (!host->parent || !host->parent->of_node)
		return 0;

	np = host->parent->of_node;

	/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
	if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
		dev_dbg(host->parent,
			"\"bus-width\" property is missing, assuming 1 bit.\n");
		bus_width = 1;
	}

	switch (bus_width) {
	case 8:
		host->caps |= MMC_CAP_8_BIT_DATA;
		/* Hosts capable of 8-bit transfers can also do 4 bits */
	case 4:
		host->caps |= MMC_CAP_4_BIT_DATA;
		break;
	case 1:
		break;
	default:
		dev_err(host->parent,
			"Invalid \"bus-width\" value %u!\n", bus_width);
		return -EINVAL;
	}

	/* f_max is obtained from the optional "max-frequency" property */
	of_property_read_u32(np, "max-frequency", &host->f_max);

	/*
	 * Configure CD and WP pins. They are both by default active low to
	 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
	 * mmc-gpio helpers are used to attach, configure and use them. If
	 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
	 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
	 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
	 * is set. If the "non-removable" property is found, the
	 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
	 * configuration is performed.
	 */

	/* Parse Card Detection */
	if (of_property_read_bool(np, "non-removable")) {
		host->caps |= MMC_CAP_NONREMOVABLE;
	} else {
		cd_cap_invert = of_property_read_bool(np, "cd-inverted");

		if (of_property_read_bool(np, "broken-cd"))
			host->caps |= MMC_CAP_NEEDS_POLL;

		ret = mmc_gpiod_request_cd(host, "cd", 0, true,
					   0, &cd_gpio_invert);
		if (!ret)
			dev_info(host->parent, "Got CD GPIO\n");
		else if (ret != -ENOENT && ret != -ENOSYS)
			return ret;

		/*
		 * There are two ways to flag that the CD line is inverted:
		 * through the cd-inverted flag and by the GPIO line itself
		 * being inverted from the GPIO subsystem. This is a leftover
		 * from the times when the GPIO subsystem did not make it
		 * possible to flag a line as inverted.
		 *
		 * If the capability on the host AND the GPIO line are
		 * both inverted, the end result is that the CD line is
		 * not inverted.
		 */
		if (cd_cap_invert ^ cd_gpio_invert)
			host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
	}

	/* Parse Write Protection */
	ro_cap_invert = of_property_read_bool(np, "wp-inverted");

	ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
	if (!ret)
		dev_info(host->parent, "Got WP GPIO\n");
	else if (ret != -ENOENT && ret != -ENOSYS)
		return ret;

	if (of_property_read_bool(np, "disable-wp"))
		host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;

	/* See the comment on CD inversion above */
	if (ro_cap_invert ^ ro_gpio_invert)
		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;

	if (of_property_read_bool(np, "cap-sd-highspeed"))
		host->caps |= MMC_CAP_SD_HIGHSPEED;
	if (of_property_read_bool(np, "cap-mmc-highspeed"))
		host->caps |= MMC_CAP_MMC_HIGHSPEED;
	if (of_property_read_bool(np, "sd-uhs-sdr12"))
		host->caps |= MMC_CAP_UHS_SDR12;
	if (of_property_read_bool(np, "sd-uhs-sdr25"))
		host->caps |= MMC_CAP_UHS_SDR25;
	if (of_property_read_bool(np, "sd-uhs-sdr50"))
		host->caps |= MMC_CAP_UHS_SDR50;
	if (of_property_read_bool(np, "sd-uhs-sdr104"))
		host->caps |= MMC_CAP_UHS_SDR104;
	if (of_property_read_bool(np, "sd-uhs-ddr50"))
		host->caps |= MMC_CAP_UHS_DDR50;
	if (of_property_read_bool(np, "cap-power-off-card"))
		host->caps |= MMC_CAP_POWER_OFF_CARD;
	if (of_property_read_bool(np, "cap-mmc-hw-reset"))
		host->caps |= MMC_CAP_HW_RESET;
	if (of_property_read_bool(np, "cap-sdio-irq"))
		host->caps |= MMC_CAP_SDIO_IRQ;
	if (of_property_read_bool(np, "full-pwr-cycle"))
		host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
	if (of_property_read_bool(np, "keep-power-in-suspend"))
		host->pm_caps |= MMC_PM_KEEP_POWER;
	if (of_property_read_bool(np, "wakeup-source") ||
	    of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
		host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
	if (of_property_read_bool(np, "mmc-ddr-1_8v"))
		host->caps |= MMC_CAP_1_8V_DDR;
	if (of_property_read_bool(np, "mmc-ddr-1_2v"))
		host->caps |= MMC_CAP_1_2V_DDR;
	if (of_property_read_bool(np, "mmc-hs200-1_8v"))
		host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
	if (of_property_read_bool(np, "mmc-hs200-1_2v"))
		host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
	if (of_property_read_bool(np, "mmc-hs400-1_8v"))
		host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
	if (of_property_read_bool(np, "mmc-hs400-1_2v"))
		host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
	if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe"))
		host->caps2 |= MMC_CAP2_HS400_ES;
	if (of_property_read_bool(np, "no-sdio"))
		host->caps2 |= MMC_CAP2_NO_SDIO;
	if (of_property_read_bool(np, "no-sd"))
		host->caps2 |= MMC_CAP2_NO_SD;
	if (of_property_read_bool(np, "no-mmc"))
		host->caps2 |= MMC_CAP2_NO_MMC;

	host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
	if (host->dsr_req && (host->dsr & ~0xffff)) {
		dev_err(host->parent,
			"device tree specified broken value for DSR: 0x%x, ignoring\n",
			host->dsr);
		host->dsr_req = 0;
	}

	return mmc_pwrseq_alloc(host);
}

EXPORT_SYMBOL(mmc_of_parse);

/**
 *	mmc_alloc_host - initialise the per-host structure.
 *	@extra: sizeof private data structure
 *	@dev: pointer to host device model structure
 *
 *	Initialise the per-host structure.
 */
struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
{
	int err;
	struct mmc_host *host;

	host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
	if (!host)
		return NULL;

	/* scanning will be enabled when we're ready */
	host->rescan_disable = 1;

again:
	if (!ida_pre_get(&mmc_host_ida, GFP_KERNEL)) {
		kfree(host);
		return NULL;
	}

	spin_lock(&mmc_host_lock);
	err = ida_get_new(&mmc_host_ida, &host->index);
	spin_unlock(&mmc_host_lock);

	if (err == -EAGAIN) {
		goto again;
	} else if (err) {
		kfree(host);
		return NULL;
	}

	dev_set_name(&host->class_dev, "mmc%d", host->index);

	host->parent = dev;
	host->class_dev.parent = dev;
	host->class_dev.class = &mmc_host_class;
	device_initialize(&host->class_dev);
	device_enable_async_suspend(&host->class_dev);

	if (mmc_gpio_alloc(host)) {
		put_device(&host->class_dev);
		return NULL;
	}

	spin_lock_init(&host->lock);
	init_waitqueue_head(&host->wq);
	INIT_DELAYED_WORK(&host->detect, mmc_rescan);
	setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);

	/*
	 * By default, hosts do not support SGIO or large requests.
	 * They have to set these according to their abilities.
	 */
	host->max_segs = 1;
	host->max_seg_size = PAGE_SIZE;

	host->max_req_size = PAGE_SIZE;
	host->max_blk_size = 512;
	host->max_blk_count = PAGE_SIZE / 512;

	return host;
}

EXPORT_SYMBOL(mmc_alloc_host);

/**
 *	mmc_add_host - initialise host hardware
 *	@host: mmc host
 *
 *	Register the host with the driver model. The host must be
 *	prepared to start servicing requests before this function
 *	completes.
 */
int mmc_add_host(struct mmc_host *host)
{
	int err;

	WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
		!host->ops->enable_sdio_irq);

	err = device_add(&host->class_dev);
	if (err)
		return err;

	led_trigger_register_simple(dev_name(&host->class_dev), &host->led);

#ifdef CONFIG_DEBUG_FS
	mmc_add_host_debugfs(host);
#endif

	mmc_start_host(host);
	mmc_register_pm_notifier(host);

	return 0;
}

EXPORT_SYMBOL(mmc_add_host);

/**
 *	mmc_remove_host - remove host hardware
 *	@host: mmc host
 *
 *	Unregister and remove all cards associated with this host,
 *	and power down the MMC bus. No new requests will be issued
 *	after this function has returned.
 */
void mmc_remove_host(struct mmc_host *host)
{
	mmc_unregister_pm_notifier(host);
	mmc_stop_host(host);

#ifdef CONFIG_DEBUG_FS
	mmc_remove_host_debugfs(host);
#endif

	device_del(&host->class_dev);

	led_trigger_unregister_simple(host->led);
}

EXPORT_SYMBOL(mmc_remove_host);

/**
 *	mmc_free_host - free the host structure
 *	@host: mmc host
 *
 *	Free the host once all references to it have been dropped.
 */
void mmc_free_host(struct mmc_host *host)
{
	mmc_pwrseq_free(host);
	put_device(&host->class_dev);
}

EXPORT_SYMBOL(mmc_free_host);
Commit	Line	Data
b93931a6 PO	1	/*
	2	* linux/drivers/mmc/core/host.c
	3	*
	4	* Copyright (C) 2003 Russell King, All Rights Reserved.
ff3112f5	5	* Copyright (C) 2007-2008 Pierre Ossman
04566831	6	* Copyright (C) 2010 Linus Walleij
b93931a6 PO	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* MMC host class device management
	13	*/
	14
	15	#include <linux/device.h>
	16	#include <linux/err.h>
	17	#include <linux/idr.h>
6c56e7a0 GL	18	#include <linux/of.h>
6c56e7a0 GL	19	#include <linux/of_gpio.h>
b93931a6	20	#include <linux/pagemap.h>
3ef77af1	21	#include <linux/export.h>
af8350c7	22	#include <linux/leds.h>
5a0e3ad6	23	#include <linux/slab.h>
b93931a6 PO	24
b93931a6 PO	25	#include <linux/mmc/host.h>
04566831	26	#include <linux/mmc/card.h>
6c56e7a0	27	#include <linux/mmc/slot-gpio.h>
b93931a6 PO	28
	29	#include "core.h"
	30	#include "host.h"
df8aca16	31	#include "slot-gpio.h"
3aa8793f	32	#include "pwrseq.h"
b93931a6 PO	33
	34	#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
	35
5674a9ba	36	static DEFINE_IDA(mmc_host_ida);
e2d1926b UH	37	static DEFINE_SPINLOCK(mmc_host_lock);
e2d1926b UH	38
b93931a6 PO	39	static void mmc_host_classdev_release(struct device *dev)
	40	{
	41	struct mmc_host *host = cls_dev_to_mmc_host(dev);
e2d1926b	42	spin_lock(&mmc_host_lock);
5674a9ba	43	ida_remove(&mmc_host_ida, host->index);
e2d1926b	44	spin_unlock(&mmc_host_lock);
b93931a6 PO	45	kfree(host);
	46	}
	47
	48	static struct class mmc_host_class = {
	49	.name = "mmc_host",
	50	.dev_release = mmc_host_classdev_release,
	51	};
	52
	53	int mmc_register_host_class(void)
	54	{
	55	return class_register(&mmc_host_class);
	56	}
	57
	58	void mmc_unregister_host_class(void)
	59	{
	60	class_unregister(&mmc_host_class);
	61	}
	62
dfa13ebb AH	63	void mmc_retune_enable(struct mmc_host *host)
	64	{
	65	host->can_retune = 1;
	66	if (host->retune_period)
	67	mod_timer(&host->retune_timer,
	68	jiffies + host->retune_period * HZ);
	69	}
	70
7ff27609 AH	71	/*
	72	* Pause re-tuning for a small set of operations. The pause begins after the
	73	* next command and after first doing re-tuning.
	74	*/
	75	void mmc_retune_pause(struct mmc_host *host)
	76	{
	77	if (!host->retune_paused) {
	78	host->retune_paused = 1;
	79	mmc_retune_needed(host);
	80	mmc_retune_hold(host);
	81	}
	82	}
	83	EXPORT_SYMBOL(mmc_retune_pause);
	84
	85	void mmc_retune_unpause(struct mmc_host *host)
	86	{
	87	if (host->retune_paused) {
	88	host->retune_paused = 0;
	89	mmc_retune_release(host);
	90	}
	91	}
	92	EXPORT_SYMBOL(mmc_retune_unpause);
	93
dfa13ebb AH	94	void mmc_retune_disable(struct mmc_host *host)
dfa13ebb AH	95	{
7ff27609	96	mmc_retune_unpause(host);
dfa13ebb AH	97	host->can_retune = 0;
	98	del_timer_sync(&host->retune_timer);
	99	host->retune_now = 0;
	100	host->need_retune = 0;
	101	}
	102
	103	void mmc_retune_timer_stop(struct mmc_host *host)
	104	{
	105	del_timer_sync(&host->retune_timer);
	106	}
	107	EXPORT_SYMBOL(mmc_retune_timer_stop);
	108
	109	void mmc_retune_hold(struct mmc_host *host)
	110	{
	111	if (!host->hold_retune)
	112	host->retune_now = 1;
	113	host->hold_retune += 1;
	114	}
	115
	116	void mmc_retune_release(struct mmc_host *host)
	117	{
	118	if (host->hold_retune)
	119	host->hold_retune -= 1;
	120	else
	121	WARN_ON(1);
	122	}
	123
	124	int mmc_retune(struct mmc_host *host)
	125	{
6376f69d	126	bool return_to_hs400 = false;
dfa13ebb AH	127	int err;
	128
	129	if (host->retune_now)
	130	host->retune_now = 0;
	131	else
	132	return 0;
	133
	134	if (!host->need_retune \|\| host->doing_retune \|\| !host->card)
	135	return 0;
	136
	137	host->need_retune = 0;
	138
	139	host->doing_retune = 1;
	140
6376f69d AH	141	if (host->ios.timing == MMC_TIMING_MMC_HS400) {
	142	err = mmc_hs400_to_hs200(host->card);
	143	if (err)
	144	goto out;
	145
	146	return_to_hs400 = true;
	147
	148	if (host->ops->prepare_hs400_tuning)
	149	host->ops->prepare_hs400_tuning(host, &host->ios);
	150	}
	151
dfa13ebb	152	err = mmc_execute_tuning(host->card);
6376f69d AH	153	if (err)
6376f69d AH	154	goto out;
dfa13ebb	155
6376f69d AH	156	if (return_to_hs400)
	157	err = mmc_hs200_to_hs400(host->card);
	158	out:
dfa13ebb AH	159	host->doing_retune = 0;
	160
	161	return err;
	162	}
	163
	164	static void mmc_retune_timer(unsigned long data)
	165	{
	166	struct mmc_host host = (struct mmc_host )data;
	167
	168	mmc_retune_needed(host);
	169	}
	170
6c56e7a0 GL	171	/**
	172	* mmc_of_parse() - parse host's device-tree node
	173	* @host: host whose node should be parsed.
	174	*
	175	* To keep the rest of the MMC subsystem unaware of whether DT has been
	176	* used to to instantiate and configure this host instance or not, we
	177	* parse the properties and set respective generic mmc-host flags and
	178	* parameters.
	179	*/
ec0a7517	180	int mmc_of_parse(struct mmc_host *host)
6c56e7a0 GL	181	{
	182	struct device_node *np;
	183	u32 bus_width;
90614cd9	184	int ret;
a31b0c6c KM	185	bool cd_cap_invert, cd_gpio_invert = false;
a31b0c6c KM	186	bool ro_cap_invert, ro_gpio_invert = false;
6c56e7a0 GL	187
6c56e7a0 GL	188	if (!host->parent \|\| !host->parent->of_node)
ec0a7517	189	return 0;
6c56e7a0 GL	190
	191	np = host->parent->of_node;
	192
	193	/* "bus-width" is translated to MMC_CAP__BIT_DATA flags /
	194	if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
	195	dev_dbg(host->parent,
	196	"\"bus-width\" property is missing, assuming 1 bit.\n");
	197	bus_width = 1;
	198	}
	199
	200	switch (bus_width) {
	201	case 8:
	202	host->caps \|= MMC_CAP_8_BIT_DATA;
	203	/* Hosts capable of 8-bit transfers can also do 4 bits */
	204	case 4:
	205	host->caps \|= MMC_CAP_4_BIT_DATA;
	206	break;
	207	case 1:
	208	break;
	209	default:
	210	dev_err(host->parent,
1c279f4f	211	"Invalid \"bus-width\" value %u!\n", bus_width);
ec0a7517	212	return -EINVAL;
6c56e7a0 GL	213	}
	214
	215	/* f_max is obtained from the optional "max-frequency" property */
	216	of_property_read_u32(np, "max-frequency", &host->f_max);
	217
	218	/*
	219	* Configure CD and WP pins. They are both by default active low to
	220	* match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
	221	* mmc-gpio helpers are used to attach, configure and use them. If
	222	* polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
	223	* and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
	224	* "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
	225	* is set. If the "non-removable" property is found, the
	226	* MMC_CAP_NONREMOVABLE capability is set and no card-detection
	227	* configuration is performed.
	228	*/
	229
	230	/* Parse Card Detection */
90614cd9	231	if (of_property_read_bool(np, "non-removable")) {
6c56e7a0 GL	232	host->caps \|= MMC_CAP_NONREMOVABLE;
6c56e7a0 GL	233	} else {
a31b0c6c	234	cd_cap_invert = of_property_read_bool(np, "cd-inverted");
6c56e7a0	235
90614cd9	236	if (of_property_read_bool(np, "broken-cd"))
6c56e7a0 GL	237	host->caps \|= MMC_CAP_NEEDS_POLL;
6c56e7a0 GL	238
89168b48	239	ret = mmc_gpiod_request_cd(host, "cd", 0, true,
a31b0c6c	240	0, &cd_gpio_invert);
9116752f	241	if (!ret)
98e90de9	242	dev_info(host->parent, "Got CD GPIO\n");
43934ece	243	else if (ret != -ENOENT && ret != -ENOSYS)
9116752f	244	return ret;
89168b48 LW	245
	246	/*
	247	* There are two ways to flag that the CD line is inverted:
	248	* through the cd-inverted flag and by the GPIO line itself
	249	* being inverted from the GPIO subsystem. This is a leftover
	250	* from the times when the GPIO subsystem did not make it
	251	* possible to flag a line as inverted.
	252	*
	253	* If the capability on the host AND the GPIO line are
	254	* both inverted, the end result is that the CD line is
	255	* not inverted.
	256	*/
a31b0c6c	257	if (cd_cap_invert ^ cd_gpio_invert)
89168b48	258	host->caps2 \|= MMC_CAP2_CD_ACTIVE_HIGH;
6c56e7a0 GL	259	}
	260
	261	/* Parse Write Protection */
a31b0c6c	262	ro_cap_invert = of_property_read_bool(np, "wp-inverted");
6c56e7a0	263
a31b0c6c	264	ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
9116752f	265	if (!ret)
98e90de9	266	dev_info(host->parent, "Got WP GPIO\n");
43934ece	267	else if (ret != -ENOENT && ret != -ENOSYS)
9116752f	268	return ret;
2fdb6e2d	269
19f44246 LPC	270	if (of_property_read_bool(np, "disable-wp"))
	271	host->caps2 \|= MMC_CAP2_NO_WRITE_PROTECT;
	272
89168b48	273	/* See the comment on CD inversion above */
a31b0c6c	274	if (ro_cap_invert ^ ro_gpio_invert)
89168b48 LW	275	host->caps2 \|= MMC_CAP2_RO_ACTIVE_HIGH;
89168b48 LW	276
90614cd9	277	if (of_property_read_bool(np, "cap-sd-highspeed"))
2fdb6e2d	278	host->caps \|= MMC_CAP_SD_HIGHSPEED;
90614cd9	279	if (of_property_read_bool(np, "cap-mmc-highspeed"))
2fdb6e2d	280	host->caps \|= MMC_CAP_MMC_HIGHSPEED;
90614cd9	281	if (of_property_read_bool(np, "sd-uhs-sdr12"))
b66bd0e4	282	host->caps \|= MMC_CAP_UHS_SDR12;
90614cd9	283	if (of_property_read_bool(np, "sd-uhs-sdr25"))
b66bd0e4	284	host->caps \|= MMC_CAP_UHS_SDR25;
90614cd9	285	if (of_property_read_bool(np, "sd-uhs-sdr50"))
b66bd0e4	286	host->caps \|= MMC_CAP_UHS_SDR50;
90614cd9	287	if (of_property_read_bool(np, "sd-uhs-sdr104"))
b66bd0e4	288	host->caps \|= MMC_CAP_UHS_SDR104;
90614cd9	289	if (of_property_read_bool(np, "sd-uhs-ddr50"))
b66bd0e4	290	host->caps \|= MMC_CAP_UHS_DDR50;
90614cd9	291	if (of_property_read_bool(np, "cap-power-off-card"))
2fdb6e2d	292	host->caps \|= MMC_CAP_POWER_OFF_CARD;
794f1578 CJ	293	if (of_property_read_bool(np, "cap-mmc-hw-reset"))
794f1578 CJ	294	host->caps \|= MMC_CAP_HW_RESET;
90614cd9	295	if (of_property_read_bool(np, "cap-sdio-irq"))
2fdb6e2d	296	host->caps \|= MMC_CAP_SDIO_IRQ;
90614cd9	297	if (of_property_read_bool(np, "full-pwr-cycle"))
5a36d6bc	298	host->caps2 \|= MMC_CAP2_FULL_PWR_CYCLE;
90614cd9	299	if (of_property_read_bool(np, "keep-power-in-suspend"))
2fdb6e2d	300	host->pm_caps \|= MMC_PM_KEEP_POWER;
0dbcdc06 SH	301	if (of_property_read_bool(np, "wakeup-source") \|\|
0dbcdc06 SH	302	of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
2fdb6e2d	303	host->pm_caps \|= MMC_PM_WAKE_SDIO_IRQ;
90614cd9	304	if (of_property_read_bool(np, "mmc-ddr-1_8v"))
c0baf848	305	host->caps \|= MMC_CAP_1_8V_DDR;
90614cd9	306	if (of_property_read_bool(np, "mmc-ddr-1_2v"))
c0baf848	307	host->caps \|= MMC_CAP_1_2V_DDR;
90614cd9	308	if (of_property_read_bool(np, "mmc-hs200-1_8v"))
321bd41d	309	host->caps2 \|= MMC_CAP2_HS200_1_8V_SDR;
90614cd9	310	if (of_property_read_bool(np, "mmc-hs200-1_2v"))
321bd41d	311	host->caps2 \|= MMC_CAP2_HS200_1_2V_SDR;
90614cd9	312	if (of_property_read_bool(np, "mmc-hs400-1_8v"))
c373eb48	313	host->caps2 \|= MMC_CAP2_HS400_1_8V \| MMC_CAP2_HS200_1_8V_SDR;
90614cd9	314	if (of_property_read_bool(np, "mmc-hs400-1_2v"))
c373eb48	315	host->caps2 \|= MMC_CAP2_HS400_1_2V \| MMC_CAP2_HS200_1_2V_SDR;
ef29c0e2 SL	316	if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe"))
ef29c0e2 SL	317	host->caps2 \|= MMC_CAP2_HS400_ES;
6ae3e537 SL	318	if (of_property_read_bool(np, "no-sdio"))
	319	host->caps2 \|= MMC_CAP2_NO_SDIO;
	320	if (of_property_read_bool(np, "no-sd"))
	321	host->caps2 \|= MMC_CAP2_NO_SD;
	322	if (of_property_read_bool(np, "no-mmc"))
	323	host->caps2 \|= MMC_CAP2_NO_MMC;
ec0a7517	324
3d705d14 SH	325	host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
	326	if (host->dsr_req && (host->dsr & ~0xffff)) {
	327	dev_err(host->parent,
	328	"device tree specified broken value for DSR: 0x%x, ignoring\n",
	329	host->dsr);
	330	host->dsr_req = 0;
	331	}
	332
3aa8793f	333	return mmc_pwrseq_alloc(host);
6c56e7a0 GL	334	}
	335
	336	EXPORT_SYMBOL(mmc_of_parse);
	337
b93931a6 PO	338	/**
	339	* mmc_alloc_host - initialise the per-host structure.
	340	* @extra: sizeof private data structure
	341	* @dev: pointer to host device model structure
	342	*
	343	* Initialise the per-host structure.
	344	*/
	345	struct mmc_host mmc_alloc_host(int extra, struct device dev)
	346	{
ff3112f5	347	int err;
b93931a6 PO	348	struct mmc_host *host;
b93931a6 PO	349
be760a9d	350	host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
b93931a6 PO	351	if (!host)
	352	return NULL;
	353
d9adcc12 GL	354	/* scanning will be enabled when we're ready */
d9adcc12 GL	355	host->rescan_disable = 1;
5674a9ba UH	356
	357	again:
	358	if (!ida_pre_get(&mmc_host_ida, GFP_KERNEL)) {
	359	kfree(host);
	360	return NULL;
	361	}
	362
ff3112f5	363	spin_lock(&mmc_host_lock);
5674a9ba	364	err = ida_get_new(&mmc_host_ida, &host->index);
ff3112f5	365	spin_unlock(&mmc_host_lock);
5674a9ba UH	366
	367	if (err == -EAGAIN) {
	368	goto again;
	369	} else if (err) {
df8aca16 UH	370	kfree(host);
	371	return NULL;
	372	}
ff3112f5	373
d1b26863	374	dev_set_name(&host->class_dev, "mmc%d", host->index);
ff3112f5	375
b93931a6 PO	376	host->parent = dev;
	377	host->class_dev.parent = dev;
	378	host->class_dev.class = &mmc_host_class;
	379	device_initialize(&host->class_dev);
ccf7bfdc	380	device_enable_async_suspend(&host->class_dev);
b93931a6	381
df8aca16 UH	382	if (mmc_gpio_alloc(host)) {
	383	put_device(&host->class_dev);
	384	return NULL;
	385	}
04566831	386
b93931a6 PO	387	spin_lock_init(&host->lock);
	388	init_waitqueue_head(&host->wq);
	389	INIT_DELAYED_WORK(&host->detect, mmc_rescan);
dfa13ebb	390	setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
b93931a6 PO	391
	392	/*
	393	* By default, hosts do not support SGIO or large requests.
	394	* They have to set these according to their abilities.
	395	*/
a36274e0	396	host->max_segs = 1;
09cbfeaf	397	host->max_seg_size = PAGE_SIZE;
b93931a6	398
09cbfeaf	399	host->max_req_size = PAGE_SIZE;
b93931a6	400	host->max_blk_size = 512;
09cbfeaf	401	host->max_blk_count = PAGE_SIZE / 512;
b93931a6 PO	402
	403	return host;
	404	}
	405
	406	EXPORT_SYMBOL(mmc_alloc_host);
	407
	408	/**
	409	* mmc_add_host - initialise host hardware
	410	* @host: mmc host
67a61c48 PO	411	*
	412	* Register the host with the driver model. The host must be
	413	* prepared to start servicing requests before this function
	414	* completes.
b93931a6 PO	415	*/
	416	int mmc_add_host(struct mmc_host *host)
	417	{
	418	int err;
	419
17b759af NP	420	WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
	421	!host->ops->enable_sdio_irq);
	422
b93931a6 PO	423	err = device_add(&host->class_dev);
	424	if (err)
	425	return err;
	426
f317dfeb WS	427	led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
f317dfeb WS	428
6edd8ee6 HS	429	#ifdef CONFIG_DEBUG_FS
	430	mmc_add_host_debugfs(host);
	431	#endif
	432
b93931a6	433	mmc_start_host(host);
8dede18e	434	mmc_register_pm_notifier(host);
b93931a6 PO	435
	436	return 0;
	437	}
	438
	439	EXPORT_SYMBOL(mmc_add_host);
	440
	441	/**
	442	* mmc_remove_host - remove host hardware
	443	* @host: mmc host
	444	*
	445	* Unregister and remove all cards associated with this host,
67a61c48 PO	446	* and power down the MMC bus. No new requests will be issued
67a61c48 PO	447	* after this function has returned.
b93931a6 PO	448	*/
	449	void mmc_remove_host(struct mmc_host *host)
	450	{
8dede18e	451	mmc_unregister_pm_notifier(host);
b93931a6 PO	452	mmc_stop_host(host);
b93931a6 PO	453
6edd8ee6 HS	454	#ifdef CONFIG_DEBUG_FS
	455	mmc_remove_host_debugfs(host);
	456	#endif
	457
b93931a6 PO	458	device_del(&host->class_dev);
b93931a6 PO	459
77f1fd6e	460	led_trigger_unregister_simple(host->led);
b93931a6 PO	461	}
	462
	463	EXPORT_SYMBOL(mmc_remove_host);
	464
	465	/**
	466	* mmc_free_host - free the host structure
	467	* @host: mmc host
	468	*
	469	* Free the host once all references to it have been dropped.
	470	*/
	471	void mmc_free_host(struct mmc_host *host)
	472	{
3aa8793f	473	mmc_pwrseq_free(host);
b93931a6 PO	474	put_device(&host->class_dev);
	475	}
	476
	477	EXPORT_SYMBOL(mmc_free_host);