[thirdparty/kernel/stable.git] / drivers / gpio / gpio-pmic-eic-sprd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Spreadtrum Communications Inc.
 * Copyright (C) 2018 Linaro Ltd.
 */

#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

/* EIC registers definition */
#define SPRD_PMIC_EIC_DATA		0x0
#define SPRD_PMIC_EIC_DMSK		0x4
#define SPRD_PMIC_EIC_IEV		0x14
#define SPRD_PMIC_EIC_IE		0x18
#define SPRD_PMIC_EIC_RIS		0x1c
#define SPRD_PMIC_EIC_MIS		0x20
#define SPRD_PMIC_EIC_IC		0x24
#define SPRD_PMIC_EIC_TRIG		0x28
#define SPRD_PMIC_EIC_CTRL0		0x40

/*
 * The PMIC EIC controller only has one bank, and each bank now can contain
 * 16 EICs.
 */
#define SPRD_PMIC_EIC_PER_BANK_NR	16
#define SPRD_PMIC_EIC_NR		SPRD_PMIC_EIC_PER_BANK_NR
#define SPRD_PMIC_EIC_DATA_MASK		GENMASK(15, 0)
#define SPRD_PMIC_EIC_BIT(x)		((x) & (SPRD_PMIC_EIC_PER_BANK_NR - 1))
#define SPRD_PMIC_EIC_DBNC_MASK		GENMASK(11, 0)

/*
 * These registers are modified under the irq bus lock and cached to avoid
 * unnecessary writes in bus_sync_unlock.
 */
enum {
	REG_IEV,
	REG_IE,
	REG_TRIG,
	CACHE_NR_REGS
};

/**
 * struct sprd_pmic_eic - PMIC EIC controller
 * @chip: the gpio_chip structure.
 * @map:  the regmap from the parent device.
 * @offset: the EIC controller's offset address of the PMIC.
 * @reg: the array to cache the EIC registers.
 * @buslock: for bus lock/sync and unlock.
 * @irq: the interrupt number of the PMIC EIC conteroller.
 */
struct sprd_pmic_eic {
	struct gpio_chip chip;
	struct regmap *map;
	u32 offset;
	u8 reg[CACHE_NR_REGS];
	struct mutex buslock;
	int irq;
};

static void sprd_pmic_eic_update(struct gpio_chip *chip, unsigned int offset,
				 u16 reg, unsigned int val)
{
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	u32 shift = SPRD_PMIC_EIC_BIT(offset);

	regmap_update_bits(pmic_eic->map, pmic_eic->offset + reg,
			   BIT(shift), val << shift);
}

static int sprd_pmic_eic_read(struct gpio_chip *chip, unsigned int offset,
			      u16 reg)
{
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	u32 value;
	int ret;

	ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value);
	if (ret)
		return ret;

	return !!(value & BIT(SPRD_PMIC_EIC_BIT(offset)));
}

static int sprd_pmic_eic_request(struct gpio_chip *chip, unsigned int offset)
{
	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 1);
	return 0;
}

static void sprd_pmic_eic_free(struct gpio_chip *chip, unsigned int offset)
{
	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 0);
}

static int sprd_pmic_eic_get(struct gpio_chip *chip, unsigned int offset)
{
	return sprd_pmic_eic_read(chip, offset, SPRD_PMIC_EIC_DATA);
}

static int sprd_pmic_eic_direction_input(struct gpio_chip *chip,
					 unsigned int offset)
{
	/* EICs are always input, nothing need to do here. */
	return 0;
}

static void sprd_pmic_eic_set(struct gpio_chip *chip, unsigned int offset,
			      int value)
{
	/* EICs are always input, nothing need to do here. */
}

static int sprd_pmic_eic_set_debounce(struct gpio_chip *chip,
				      unsigned int offset,
				      unsigned int debounce)
{
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	u32 reg, value;
	int ret;

	reg = SPRD_PMIC_EIC_CTRL0 + SPRD_PMIC_EIC_BIT(offset) * 0x4;
	ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value);
	if (ret)
		return ret;

	value &= ~SPRD_PMIC_EIC_DBNC_MASK;
	value |= (debounce / 1000) & SPRD_PMIC_EIC_DBNC_MASK;
	return regmap_write(pmic_eic->map, pmic_eic->offset + reg, value);
}

static int sprd_pmic_eic_set_config(struct gpio_chip *chip, unsigned int offset,
				    unsigned long config)
{
	unsigned long param = pinconf_to_config_param(config);
	u32 arg = pinconf_to_config_argument(config);

	if (param == PIN_CONFIG_INPUT_DEBOUNCE)
		return sprd_pmic_eic_set_debounce(chip, offset, arg);

	return -ENOTSUPP;
}

static void sprd_pmic_eic_irq_mask(struct irq_data *data)
{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	u32 offset = irqd_to_hwirq(data);

	pmic_eic->reg[REG_IE] = 0;
	pmic_eic->reg[REG_TRIG] = 0;

	gpiochip_disable_irq(chip, offset);
}

static void sprd_pmic_eic_irq_unmask(struct irq_data *data)
{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	u32 offset = irqd_to_hwirq(data);

	gpiochip_enable_irq(chip, offset);

	pmic_eic->reg[REG_IE] = 1;
	pmic_eic->reg[REG_TRIG] = 1;
}

static int sprd_pmic_eic_irq_set_type(struct irq_data *data,
				      unsigned int flow_type)
{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);

	switch (flow_type) {
	case IRQ_TYPE_LEVEL_HIGH:
		pmic_eic->reg[REG_IEV] = 1;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		pmic_eic->reg[REG_IEV] = 0;
		break;
	case IRQ_TYPE_EDGE_RISING:
	case IRQ_TYPE_EDGE_FALLING:
	case IRQ_TYPE_EDGE_BOTH:
		/*
		 * Will set the trigger level according to current EIC level
		 * in irq_bus_sync_unlock() interface, so here nothing to do.
		 */
		break;
	default:
		return -ENOTSUPP;
	}

	return 0;
}

static void sprd_pmic_eic_bus_lock(struct irq_data *data)
{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);

	mutex_lock(&pmic_eic->buslock);
}

static void sprd_pmic_eic_bus_sync_unlock(struct irq_data *data)
{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	u32 trigger = irqd_get_trigger_type(data);
	u32 offset = irqd_to_hwirq(data);
	int state;

	/* Set irq type */
	if (trigger & IRQ_TYPE_EDGE_BOTH) {
		state = sprd_pmic_eic_get(chip, offset);
		if (state)
			sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 0);
		else
			sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1);
	} else {
		sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV,
				     pmic_eic->reg[REG_IEV]);
	}

	/* Set irq unmask */
	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE,
			     pmic_eic->reg[REG_IE]);
	/* Generate trigger start pulse for debounce EIC */
	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG,
			     pmic_eic->reg[REG_TRIG]);

	mutex_unlock(&pmic_eic->buslock);
}

static void sprd_pmic_eic_toggle_trigger(struct gpio_chip *chip,
					 unsigned int irq, unsigned int offset)
{
	u32 trigger = irq_get_trigger_type(irq);
	int state, post_state;

	if (!(trigger & IRQ_TYPE_EDGE_BOTH))
		return;

	state = sprd_pmic_eic_get(chip, offset);
retry:
	if (state)
		sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 0);
	else
		sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1);

	post_state = sprd_pmic_eic_get(chip, offset);
	if (state != post_state) {
		dev_warn(chip->parent, "PMIC EIC level was changed.\n");
		state = post_state;
		goto retry;
	}

	/* Set irq unmask */
	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE, 1);
	/* Generate trigger start pulse for debounce EIC */
	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG, 1);
}

static irqreturn_t sprd_pmic_eic_irq_handler(int irq, void *data)
{
	struct sprd_pmic_eic *pmic_eic = data;
	struct gpio_chip *chip = &pmic_eic->chip;
	unsigned long status;
	u32 n, girq, val;
	int ret;

	ret = regmap_read(pmic_eic->map, pmic_eic->offset + SPRD_PMIC_EIC_MIS,
			  &val);
	if (ret)
		return IRQ_RETVAL(ret);

	status = val & SPRD_PMIC_EIC_DATA_MASK;

	for_each_set_bit(n, &status, chip->ngpio) {
		/* Clear the interrupt */
		sprd_pmic_eic_update(chip, n, SPRD_PMIC_EIC_IC, 1);

		girq = irq_find_mapping(chip->irq.domain, n);
		handle_nested_irq(girq);

		/*
		 * The PMIC EIC can only support level trigger, so we can
		 * toggle the level trigger to emulate the edge trigger.
		 */
		sprd_pmic_eic_toggle_trigger(chip, girq, n);
	}

	return IRQ_HANDLED;
}

static const struct irq_chip pmic_eic_irq_chip = {
	.name			= "sprd-pmic-eic",
	.irq_mask		= sprd_pmic_eic_irq_mask,
	.irq_unmask		= sprd_pmic_eic_irq_unmask,
	.irq_set_type		= sprd_pmic_eic_irq_set_type,
	.irq_bus_lock		= sprd_pmic_eic_bus_lock,
	.irq_bus_sync_unlock	= sprd_pmic_eic_bus_sync_unlock,
	.flags			= IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
	GPIOCHIP_IRQ_RESOURCE_HELPERS,
};

static int sprd_pmic_eic_probe(struct platform_device *pdev)
{
	struct gpio_irq_chip *irq;
	struct sprd_pmic_eic *pmic_eic;
	int ret;

	pmic_eic = devm_kzalloc(&pdev->dev, sizeof(*pmic_eic), GFP_KERNEL);
	if (!pmic_eic)
		return -ENOMEM;

	mutex_init(&pmic_eic->buslock);

	pmic_eic->irq = platform_get_irq(pdev, 0);
	if (pmic_eic->irq < 0)
		return pmic_eic->irq;

	pmic_eic->map = dev_get_regmap(pdev->dev.parent, NULL);
	if (!pmic_eic->map)
		return -ENODEV;

	ret = of_property_read_u32(pdev->dev.of_node, "reg", &pmic_eic->offset);
	if (ret) {
		dev_err(&pdev->dev, "Failed to get PMIC EIC base address.\n");
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, pmic_eic->irq, NULL,
					sprd_pmic_eic_irq_handler,
					IRQF_ONESHOT | IRQF_NO_SUSPEND,
					dev_name(&pdev->dev), pmic_eic);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request PMIC EIC IRQ.\n");
		return ret;
	}

	pmic_eic->chip.label = dev_name(&pdev->dev);
	pmic_eic->chip.ngpio = SPRD_PMIC_EIC_NR;
	pmic_eic->chip.base = -1;
	pmic_eic->chip.parent = &pdev->dev;
	pmic_eic->chip.direction_input = sprd_pmic_eic_direction_input;
	pmic_eic->chip.request = sprd_pmic_eic_request;
	pmic_eic->chip.free = sprd_pmic_eic_free;
	pmic_eic->chip.set_config = sprd_pmic_eic_set_config;
	pmic_eic->chip.set = sprd_pmic_eic_set;
	pmic_eic->chip.get = sprd_pmic_eic_get;
	pmic_eic->chip.can_sleep = true;

	irq = &pmic_eic->chip.irq;
	gpio_irq_chip_set_chip(irq, &pmic_eic_irq_chip);
	irq->threaded = true;

	ret = devm_gpiochip_add_data(&pdev->dev, &pmic_eic->chip, pmic_eic);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret);
		return ret;
	}

	return 0;
}

static const struct of_device_id sprd_pmic_eic_of_match[] = {
	{ .compatible = "sprd,sc2731-eic", },
	{ /* end of list */ }
};
MODULE_DEVICE_TABLE(of, sprd_pmic_eic_of_match);

static struct platform_driver sprd_pmic_eic_driver = {
	.probe = sprd_pmic_eic_probe,
	.driver = {
		.name = "sprd-pmic-eic",
		.of_match_table	= sprd_pmic_eic_of_match,
	},
};

module_platform_driver(sprd_pmic_eic_driver);

MODULE_DESCRIPTION("Spreadtrum PMIC EIC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
348f3cde BW	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (C) 2018 Spreadtrum Communications Inc.
	4	* Copyright (C) 2018 Linaro Ltd.
	5	*/
	6
	7	#include <linux/gpio/driver.h>
	8	#include <linux/interrupt.h>
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
e91d0f05	11	#include <linux/of.h>
348f3cde BW	12	#include <linux/platform_device.h>
	13	#include <linux/regmap.h>
	14
	15	/* EIC registers definition */
	16	#define SPRD_PMIC_EIC_DATA 0x0
	17	#define SPRD_PMIC_EIC_DMSK 0x4
	18	#define SPRD_PMIC_EIC_IEV 0x14
	19	#define SPRD_PMIC_EIC_IE 0x18
	20	#define SPRD_PMIC_EIC_RIS 0x1c
	21	#define SPRD_PMIC_EIC_MIS 0x20
	22	#define SPRD_PMIC_EIC_IC 0x24
	23	#define SPRD_PMIC_EIC_TRIG 0x28
	24	#define SPRD_PMIC_EIC_CTRL0 0x40
	25
	26	/*
	27	* The PMIC EIC controller only has one bank, and each bank now can contain
	28	* 16 EICs.
	29	*/
	30	#define SPRD_PMIC_EIC_PER_BANK_NR 16
	31	#define SPRD_PMIC_EIC_NR SPRD_PMIC_EIC_PER_BANK_NR
	32	#define SPRD_PMIC_EIC_DATA_MASK GENMASK(15, 0)
	33	#define SPRD_PMIC_EIC_BIT(x) ((x) & (SPRD_PMIC_EIC_PER_BANK_NR - 1))
	34	#define SPRD_PMIC_EIC_DBNC_MASK GENMASK(11, 0)
	35
	36	/*
	37	* These registers are modified under the irq bus lock and cached to avoid
	38	* unnecessary writes in bus_sync_unlock.
	39	*/
	40	enum {
	41	REG_IEV,
	42	REG_IE,
	43	REG_TRIG,
	44	CACHE_NR_REGS
	45	};
	46
	47	/**
	48	* struct sprd_pmic_eic - PMIC EIC controller
	49	* @chip: the gpio_chip structure.
3cd7f770	50	* @map: the regmap from the parent device.
348f3cde BW	51	* @offset: the EIC controller's offset address of the PMIC.
	52	* @reg: the array to cache the EIC registers.
	53	* @buslock: for bus lock/sync and unlock.
	54	* @irq: the interrupt number of the PMIC EIC conteroller.
	55	*/
	56	struct sprd_pmic_eic {
	57	struct gpio_chip chip;
348f3cde BW	58	struct regmap *map;
	59	u32 offset;
	60	u8 reg[CACHE_NR_REGS];
	61	struct mutex buslock;
	62	int irq;
	63	};
	64
	65	static void sprd_pmic_eic_update(struct gpio_chip *chip, unsigned int offset,
	66	u16 reg, unsigned int val)
	67	{
	68	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	69	u32 shift = SPRD_PMIC_EIC_BIT(offset);
	70
	71	regmap_update_bits(pmic_eic->map, pmic_eic->offset + reg,
	72	BIT(shift), val << shift);
	73	}
	74
	75	static int sprd_pmic_eic_read(struct gpio_chip *chip, unsigned int offset,
	76	u16 reg)
	77	{
	78	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	79	u32 value;
	80	int ret;
	81
	82	ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value);
	83	if (ret)
	84	return ret;
	85
	86	return !!(value & BIT(SPRD_PMIC_EIC_BIT(offset)));
	87	}
	88
	89	static int sprd_pmic_eic_request(struct gpio_chip *chip, unsigned int offset)
	90	{
	91	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 1);
	92	return 0;
	93	}
	94
	95	static void sprd_pmic_eic_free(struct gpio_chip *chip, unsigned int offset)
	96	{
	97	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 0);
	98	}
	99
	100	static int sprd_pmic_eic_get(struct gpio_chip *chip, unsigned int offset)
	101	{
	102	return sprd_pmic_eic_read(chip, offset, SPRD_PMIC_EIC_DATA);
	103	}
	104
	105	static int sprd_pmic_eic_direction_input(struct gpio_chip *chip,
	106	unsigned int offset)
	107	{
	108	/* EICs are always input, nothing need to do here. */
	109	return 0;
	110	}
	111
	112	static void sprd_pmic_eic_set(struct gpio_chip *chip, unsigned int offset,
	113	int value)
	114	{
	115	/* EICs are always input, nothing need to do here. */
	116	}
	117
	118	static int sprd_pmic_eic_set_debounce(struct gpio_chip *chip,
	119	unsigned int offset,
	120	unsigned int debounce)
	121	{
122	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
123	u32 reg, value;
124	int ret;
125
126	reg = SPRD_PMIC_EIC_CTRL0 + SPRD_PMIC_EIC_BIT(offset) * 0x4;
127	ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value);
128	if (ret)
129	return ret;
130
131	value &= ~SPRD_PMIC_EIC_DBNC_MASK;
132	value \|= (debounce / 1000) & SPRD_PMIC_EIC_DBNC_MASK;
133	return regmap_write(pmic_eic->map, pmic_eic->offset + reg, value);
134	}
135
136	static int sprd_pmic_eic_set_config(struct gpio_chip *chip, unsigned int offset,
137	unsigned long config)
138	{
139	unsigned long param = pinconf_to_config_param(config);
140	u32 arg = pinconf_to_config_argument(config);
141
142	if (param == PIN_CONFIG_INPUT_DEBOUNCE)
143	return sprd_pmic_eic_set_debounce(chip, offset, arg);
144
145	return -ENOTSUPP;
146	}
147
148	static void sprd_pmic_eic_irq_mask(struct irq_data *data)
149	{
150	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
151	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
be43eea7	152	u32 offset = irqd_to_hwirq(data);
348f3cde BW	153
	154	pmic_eic->reg[REG_IE] = 0;
	155	pmic_eic->reg[REG_TRIG] = 0;
be43eea7 CG	156
be43eea7 CG	157	gpiochip_disable_irq(chip, offset);
348f3cde BW	158	}
	159
	160	static void sprd_pmic_eic_irq_unmask(struct irq_data *data)
	161	{
	162	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	163	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
be43eea7 CG	164	u32 offset = irqd_to_hwirq(data);
	165
	166	gpiochip_enable_irq(chip, offset);
348f3cde BW	167
	168	pmic_eic->reg[REG_IE] = 1;
	169	pmic_eic->reg[REG_TRIG] = 1;
	170	}
	171
	172	static int sprd_pmic_eic_irq_set_type(struct irq_data *data,
	173	unsigned int flow_type)
	174	{
	175	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	176	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	177
	178	switch (flow_type) {
	179	case IRQ_TYPE_LEVEL_HIGH:
	180	pmic_eic->reg[REG_IEV] = 1;
	181	break;
	182	case IRQ_TYPE_LEVEL_LOW:
	183	pmic_eic->reg[REG_IEV] = 0;
	184	break;
92da8b9d BW	185	case IRQ_TYPE_EDGE_RISING:
	186	case IRQ_TYPE_EDGE_FALLING:
	187	case IRQ_TYPE_EDGE_BOTH:
	188	/*
	189	* Will set the trigger level according to current EIC level
	190	* in irq_bus_sync_unlock() interface, so here nothing to do.
	191	*/
	192	break;
348f3cde BW	193	default:
	194	return -ENOTSUPP;
	195	}
	196
	197	return 0;
	198	}
	199
	200	static void sprd_pmic_eic_bus_lock(struct irq_data *data)
	201	{
	202	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	203	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
	204
	205	mutex_lock(&pmic_eic->buslock);
	206	}
	207
	208	static void sprd_pmic_eic_bus_sync_unlock(struct irq_data *data)
	209	{
	210	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	211	struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip);
92da8b9d	212	u32 trigger = irqd_get_trigger_type(data);
348f3cde	213	u32 offset = irqd_to_hwirq(data);
92da8b9d	214	int state;
348f3cde BW	215
348f3cde BW	216	/* Set irq type */
92da8b9d BW	217	if (trigger & IRQ_TYPE_EDGE_BOTH) {
	218	state = sprd_pmic_eic_get(chip, offset);
	219	if (state)
	220	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 0);
	221	else
	222	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1);
	223	} else {
	224	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV,
	225	pmic_eic->reg[REG_IEV]);
	226	}
	227
348f3cde BW	228	/* Set irq unmask */
	229	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE,
	230	pmic_eic->reg[REG_IE]);
	231	/* Generate trigger start pulse for debounce EIC */
	232	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG,
	233	pmic_eic->reg[REG_TRIG]);
	234
	235	mutex_unlock(&pmic_eic->buslock);
	236	}
	237
92da8b9d BW	238	static void sprd_pmic_eic_toggle_trigger(struct gpio_chip *chip,
	239	unsigned int irq, unsigned int offset)
	240	{
	241	u32 trigger = irq_get_trigger_type(irq);
	242	int state, post_state;
	243
	244	if (!(trigger & IRQ_TYPE_EDGE_BOTH))
	245	return;
	246
	247	state = sprd_pmic_eic_get(chip, offset);
	248	retry:
	249	if (state)
	250	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 0);
	251	else
	252	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1);
	253
	254	post_state = sprd_pmic_eic_get(chip, offset);
	255	if (state != post_state) {
	256	dev_warn(chip->parent, "PMIC EIC level was changed.\n");
	257	state = post_state;
	258	goto retry;
	259	}
	260
	261	/* Set irq unmask */
	262	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE, 1);
	263	/* Generate trigger start pulse for debounce EIC */
	264	sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG, 1);
	265	}
	266
348f3cde BW	267	static irqreturn_t sprd_pmic_eic_irq_handler(int irq, void *data)
	268	{
	269	struct sprd_pmic_eic *pmic_eic = data;
	270	struct gpio_chip *chip = &pmic_eic->chip;
	271	unsigned long status;
	272	u32 n, girq, val;
	273	int ret;
	274
	275	ret = regmap_read(pmic_eic->map, pmic_eic->offset + SPRD_PMIC_EIC_MIS,
	276	&val);
	277	if (ret)
	278	return IRQ_RETVAL(ret);
	279
	280	status = val & SPRD_PMIC_EIC_DATA_MASK;
	281
	282	for_each_set_bit(n, &status, chip->ngpio) {
	283	/* Clear the interrupt */
	284	sprd_pmic_eic_update(chip, n, SPRD_PMIC_EIC_IC, 1);
	285
	286	girq = irq_find_mapping(chip->irq.domain, n);
	287	handle_nested_irq(girq);
92da8b9d BW	288
	289	/*
	290	* The PMIC EIC can only support level trigger, so we can
	291	* toggle the level trigger to emulate the edge trigger.
	292	*/
	293	sprd_pmic_eic_toggle_trigger(chip, girq, n);
348f3cde BW	294	}
	295
	296	return IRQ_HANDLED;
	297	}
	298
be43eea7 CG	299	static const struct irq_chip pmic_eic_irq_chip = {
	300	.name = "sprd-pmic-eic",
	301	.irq_mask = sprd_pmic_eic_irq_mask,
	302	.irq_unmask = sprd_pmic_eic_irq_unmask,
	303	.irq_set_type = sprd_pmic_eic_irq_set_type,
	304	.irq_bus_lock = sprd_pmic_eic_bus_lock,
	305	.irq_bus_sync_unlock = sprd_pmic_eic_bus_sync_unlock,
	306	.flags = IRQCHIP_SKIP_SET_WAKE \| IRQCHIP_IMMUTABLE,
	307	GPIOCHIP_IRQ_RESOURCE_HELPERS,
	308	};
	309
348f3cde BW	310	static int sprd_pmic_eic_probe(struct platform_device *pdev)
	311	{
	312	struct gpio_irq_chip *irq;
	313	struct sprd_pmic_eic *pmic_eic;
	314	int ret;
	315
	316	pmic_eic = devm_kzalloc(&pdev->dev, sizeof(*pmic_eic), GFP_KERNEL);
	317	if (!pmic_eic)
	318	return -ENOMEM;
	319
	320	mutex_init(&pmic_eic->buslock);
	321
	322	pmic_eic->irq = platform_get_irq(pdev, 0);
15bddb7d	323	if (pmic_eic->irq < 0)
348f3cde	324	return pmic_eic->irq;
348f3cde BW	325
	326	pmic_eic->map = dev_get_regmap(pdev->dev.parent, NULL);
	327	if (!pmic_eic->map)
	328	return -ENODEV;
	329
	330	ret = of_property_read_u32(pdev->dev.of_node, "reg", &pmic_eic->offset);
	331	if (ret) {
	332	dev_err(&pdev->dev, "Failed to get PMIC EIC base address.\n");
	333	return ret;
	334	}
	335
	336	ret = devm_request_threaded_irq(&pdev->dev, pmic_eic->irq, NULL,
	337	sprd_pmic_eic_irq_handler,
348f3cde BW	338	IRQF_ONESHOT \| IRQF_NO_SUSPEND,
	339	dev_name(&pdev->dev), pmic_eic);
	340	if (ret) {
	341	dev_err(&pdev->dev, "Failed to request PMIC EIC IRQ.\n");
	342	return ret;
	343	}
	344
	345	pmic_eic->chip.label = dev_name(&pdev->dev);
	346	pmic_eic->chip.ngpio = SPRD_PMIC_EIC_NR;
	347	pmic_eic->chip.base = -1;
	348	pmic_eic->chip.parent = &pdev->dev;
348f3cde BW	349	pmic_eic->chip.direction_input = sprd_pmic_eic_direction_input;
	350	pmic_eic->chip.request = sprd_pmic_eic_request;
	351	pmic_eic->chip.free = sprd_pmic_eic_free;
	352	pmic_eic->chip.set_config = sprd_pmic_eic_set_config;
	353	pmic_eic->chip.set = sprd_pmic_eic_set;
	354	pmic_eic->chip.get = sprd_pmic_eic_get;
26d9e564	355	pmic_eic->chip.can_sleep = true;
348f3cde	356
348f3cde	357	irq = &pmic_eic->chip.irq;
be43eea7	358	gpio_irq_chip_set_chip(irq, &pmic_eic_irq_chip);
348f3cde BW	359	irq->threaded = true;
	360
	361	ret = devm_gpiochip_add_data(&pdev->dev, &pmic_eic->chip, pmic_eic);
	362	if (ret < 0) {
	363	dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret);
	364	return ret;
	365	}
	366
348f3cde BW	367	return 0;
	368	}
	369
	370	static const struct of_device_id sprd_pmic_eic_of_match[] = {
567cbf07	371	{ .compatible = "sprd,sc2731-eic", },
348f3cde BW	372	{ /* end of list */ }
	373	};
	374	MODULE_DEVICE_TABLE(of, sprd_pmic_eic_of_match);
	375
	376	static struct platform_driver sprd_pmic_eic_driver = {
	377	.probe = sprd_pmic_eic_probe,
	378	.driver = {
	379	.name = "sprd-pmic-eic",
	380	.of_match_table = sprd_pmic_eic_of_match,
	381	},
	382	};
	383
	384	module_platform_driver(sprd_pmic_eic_driver);
	385
	386	MODULE_DESCRIPTION("Spreadtrum PMIC EIC driver");
	387	MODULE_LICENSE("GPL v2");