[mirror_ubuntu-hirsute-kernel.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);
}

void mmc_retune_disable(struct mmc_host *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;

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