[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-ftgpio010.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Faraday Technolog FTGPIO010 gpiochip and interrupt routines
 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
 *
 * Based on arch/arm/mach-gemini/gpio.c:
 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
 *
 * Based on plat-mxc/gpio.c:
 * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 */
#include <linux/gpio/driver.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_gpio.h>
#include <linux/bitops.h>

/* GPIO registers definition */
#define GPIO_DATA_OUT		0x00
#define GPIO_DATA_IN		0x04
#define GPIO_DIR		0x08
#define GPIO_DATA_SET		0x10
#define GPIO_DATA_CLR		0x14
#define GPIO_PULL_EN		0x18
#define GPIO_PULL_TYPE		0x1C
#define GPIO_INT_EN		0x20
#define GPIO_INT_STAT		0x24
#define GPIO_INT_MASK		0x2C
#define GPIO_INT_CLR		0x30
#define GPIO_INT_TYPE		0x34
#define GPIO_INT_BOTH_EDGE	0x38
#define GPIO_INT_LEVEL		0x3C
#define GPIO_DEBOUNCE_EN	0x40
#define GPIO_DEBOUNCE_PRESCALE	0x44

/**
 * struct ftgpio_gpio - Gemini GPIO state container
 * @dev: containing device for this instance
 * @gc: gpiochip for this instance
 */
struct ftgpio_gpio {
	struct device *dev;
	struct gpio_chip gc;
	void __iomem *base;
};

static void ftgpio_gpio_ack_irq(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ftgpio_gpio *g = gpiochip_get_data(gc);

	writel(BIT(irqd_to_hwirq(d)), g->base + GPIO_INT_CLR);
}

static void ftgpio_gpio_mask_irq(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ftgpio_gpio *g = gpiochip_get_data(gc);
	u32 val;

	val = readl(g->base + GPIO_INT_EN);
	val &= ~BIT(irqd_to_hwirq(d));
	writel(val, g->base + GPIO_INT_EN);
}

static void ftgpio_gpio_unmask_irq(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ftgpio_gpio *g = gpiochip_get_data(gc);
	u32 val;

	val = readl(g->base + GPIO_INT_EN);
	val |= BIT(irqd_to_hwirq(d));
	writel(val, g->base + GPIO_INT_EN);
}

static int ftgpio_gpio_set_irq_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ftgpio_gpio *g = gpiochip_get_data(gc);
	u32 mask = BIT(irqd_to_hwirq(d));
	u32 reg_both, reg_level, reg_type;

	reg_type = readl(g->base + GPIO_INT_TYPE);
	reg_level = readl(g->base + GPIO_INT_LEVEL);
	reg_both = readl(g->base + GPIO_INT_BOTH_EDGE);

	switch (type) {
	case IRQ_TYPE_EDGE_BOTH:
		irq_set_handler_locked(d, handle_edge_irq);
		reg_type &= ~mask;
		reg_both |= mask;
		break;
	case IRQ_TYPE_EDGE_RISING:
		irq_set_handler_locked(d, handle_edge_irq);
		reg_type &= ~mask;
		reg_both &= ~mask;
		reg_level &= ~mask;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		irq_set_handler_locked(d, handle_edge_irq);
		reg_type &= ~mask;
		reg_both &= ~mask;
		reg_level |= mask;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		irq_set_handler_locked(d, handle_level_irq);
		reg_type |= mask;
		reg_level &= ~mask;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		irq_set_handler_locked(d, handle_level_irq);
		reg_type |= mask;
		reg_level |= mask;
		break;
	default:
		irq_set_handler_locked(d, handle_bad_irq);
		return -EINVAL;
	}

	writel(reg_type, g->base + GPIO_INT_TYPE);
	writel(reg_level, g->base + GPIO_INT_LEVEL);
	writel(reg_both, g->base + GPIO_INT_BOTH_EDGE);

	ftgpio_gpio_ack_irq(d);

	return 0;
}

static struct irq_chip ftgpio_gpio_irqchip = {
	.name = "FTGPIO010",
	.irq_ack = ftgpio_gpio_ack_irq,
	.irq_mask = ftgpio_gpio_mask_irq,
	.irq_unmask = ftgpio_gpio_unmask_irq,
	.irq_set_type = ftgpio_gpio_set_irq_type,
};

static void ftgpio_gpio_irq_handler(struct irq_desc *desc)
{
	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
	struct ftgpio_gpio *g = gpiochip_get_data(gc);
	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	int offset;
	unsigned long stat;

	chained_irq_enter(irqchip, desc);

	stat = readl(g->base + GPIO_INT_STAT);
	if (stat)
		for_each_set_bit(offset, &stat, gc->ngpio)
			generic_handle_irq(irq_find_mapping(gc->irq.domain,
							    offset));

	chained_irq_exit(irqchip, desc);
}

static int ftgpio_gpio_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct ftgpio_gpio *g;
	int irq;
	int ret;

	g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL);
	if (!g)
		return -ENOMEM;

	g->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	g->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(g->base))
		return PTR_ERR(g->base);

	irq = platform_get_irq(pdev, 0);
	if (!irq)
		return -EINVAL;

	ret = bgpio_init(&g->gc, dev, 4,
			 g->base + GPIO_DATA_IN,
			 g->base + GPIO_DATA_SET,
			 g->base + GPIO_DATA_CLR,
			 g->base + GPIO_DIR,
			 NULL,
			 0);
	if (ret) {
		dev_err(dev, "unable to init generic GPIO\n");
		return ret;
	}
	g->gc.label = "FTGPIO010";
	g->gc.base = -1;
	g->gc.parent = dev;
	g->gc.owner = THIS_MODULE;
	/* ngpio is set by bgpio_init() */

	ret = devm_gpiochip_add_data(dev, &g->gc, g);
	if (ret)
		return ret;

	/* Disable, unmask and clear all interrupts */
	writel(0x0, g->base + GPIO_INT_EN);
	writel(0x0, g->base + GPIO_INT_MASK);
	writel(~0x0, g->base + GPIO_INT_CLR);

	ret = gpiochip_irqchip_add(&g->gc, &ftgpio_gpio_irqchip,
				   0, handle_bad_irq,
				   IRQ_TYPE_NONE);
	if (ret) {
		dev_info(dev, "could not add irqchip\n");
		return ret;
	}
	gpiochip_set_chained_irqchip(&g->gc, &ftgpio_gpio_irqchip,
				     irq, ftgpio_gpio_irq_handler);

	dev_info(dev, "FTGPIO010 @%p registered\n", g->base);

	return 0;
}

static const struct of_device_id ftgpio_gpio_of_match[] = {
	{
		.compatible = "cortina,gemini-gpio",
	},
	{
		.compatible = "moxa,moxart-gpio",
	},
	{
		.compatible = "faraday,ftgpio010",
	},
	{},
};

static struct platform_driver ftgpio_gpio_driver = {
	.driver = {
		.name		= "ftgpio010-gpio",
		.of_match_table = of_match_ptr(ftgpio_gpio_of_match),
	},
	.probe	= ftgpio_gpio_probe,
};
builtin_platform_driver(ftgpio_gpio_driver);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
49cec4d8	2	/*
9d3a15aa	3	* Faraday Technolog FTGPIO010 gpiochip and interrupt routines
49cec4d8 LW	4	* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
	5	*
	6	* Based on arch/arm/mach-gemini/gpio.c:
	7	* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
	8	*
	9	* Based on plat-mxc/gpio.c:
	10	* MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
	11	* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
	12	*/
	13	#include <linux/gpio/driver.h>
	14	#include <linux/io.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/of_gpio.h>
	18	#include <linux/bitops.h>
	19
	20	/* GPIO registers definition */
	21	#define GPIO_DATA_OUT 0x00
	22	#define GPIO_DATA_IN 0x04
	23	#define GPIO_DIR 0x08
	24	#define GPIO_DATA_SET 0x10
	25	#define GPIO_DATA_CLR 0x14
	26	#define GPIO_PULL_EN 0x18
	27	#define GPIO_PULL_TYPE 0x1C
	28	#define GPIO_INT_EN 0x20
	29	#define GPIO_INT_STAT 0x24
	30	#define GPIO_INT_MASK 0x2C
	31	#define GPIO_INT_CLR 0x30
	32	#define GPIO_INT_TYPE 0x34
	33	#define GPIO_INT_BOTH_EDGE 0x38
	34	#define GPIO_INT_LEVEL 0x3C
	35	#define GPIO_DEBOUNCE_EN 0x40
	36	#define GPIO_DEBOUNCE_PRESCALE 0x44
	37
	38	/**
9d3a15aa	39	* struct ftgpio_gpio - Gemini GPIO state container
49cec4d8 LW	40	* @dev: containing device for this instance
	41	* @gc: gpiochip for this instance
	42	*/
9d3a15aa	43	struct ftgpio_gpio {
49cec4d8 LW	44	struct device *dev;
	45	struct gpio_chip gc;
	46	void __iomem *base;
	47	};
	48
9d3a15aa	49	static void ftgpio_gpio_ack_irq(struct irq_data *d)
49cec4d8 LW	50	{
49cec4d8 LW	51	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	52	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	53
	54	writel(BIT(irqd_to_hwirq(d)), g->base + GPIO_INT_CLR);
	55	}
	56
9d3a15aa	57	static void ftgpio_gpio_mask_irq(struct irq_data *d)
49cec4d8 LW	58	{
49cec4d8 LW	59	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	60	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	61	u32 val;
	62
	63	val = readl(g->base + GPIO_INT_EN);
	64	val &= ~BIT(irqd_to_hwirq(d));
	65	writel(val, g->base + GPIO_INT_EN);
	66	}
	67
9d3a15aa	68	static void ftgpio_gpio_unmask_irq(struct irq_data *d)
49cec4d8 LW	69	{
49cec4d8 LW	70	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	71	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	72	u32 val;
	73
	74	val = readl(g->base + GPIO_INT_EN);
	75	val \|= BIT(irqd_to_hwirq(d));
	76	writel(val, g->base + GPIO_INT_EN);
	77	}
	78
9d3a15aa	79	static int ftgpio_gpio_set_irq_type(struct irq_data *d, unsigned int type)
49cec4d8 LW	80	{
49cec4d8 LW	81	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	82	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	83	u32 mask = BIT(irqd_to_hwirq(d));
	84	u32 reg_both, reg_level, reg_type;
	85
	86	reg_type = readl(g->base + GPIO_INT_TYPE);
	87	reg_level = readl(g->base + GPIO_INT_LEVEL);
	88	reg_both = readl(g->base + GPIO_INT_BOTH_EDGE);
	89
	90	switch (type) {
	91	case IRQ_TYPE_EDGE_BOTH:
	92	irq_set_handler_locked(d, handle_edge_irq);
	93	reg_type &= ~mask;
	94	reg_both \|= mask;
	95	break;
	96	case IRQ_TYPE_EDGE_RISING:
	97	irq_set_handler_locked(d, handle_edge_irq);
	98	reg_type &= ~mask;
	99	reg_both &= ~mask;
	100	reg_level &= ~mask;
	101	break;
	102	case IRQ_TYPE_EDGE_FALLING:
	103	irq_set_handler_locked(d, handle_edge_irq);
	104	reg_type &= ~mask;
	105	reg_both &= ~mask;
	106	reg_level \|= mask;
	107	break;
	108	case IRQ_TYPE_LEVEL_HIGH:
	109	irq_set_handler_locked(d, handle_level_irq);
	110	reg_type \|= mask;
	111	reg_level &= ~mask;
	112	break;
	113	case IRQ_TYPE_LEVEL_LOW:
	114	irq_set_handler_locked(d, handle_level_irq);
	115	reg_type \|= mask;
	116	reg_level \|= mask;
	117	break;
	118	default:
	119	irq_set_handler_locked(d, handle_bad_irq);
	120	return -EINVAL;
	121	}
	122
	123	writel(reg_type, g->base + GPIO_INT_TYPE);
	124	writel(reg_level, g->base + GPIO_INT_LEVEL);
	125	writel(reg_both, g->base + GPIO_INT_BOTH_EDGE);
	126
9d3a15aa	127	ftgpio_gpio_ack_irq(d);
49cec4d8 LW	128
	129	return 0;
	130	}
	131
9d3a15aa LW	132	static struct irq_chip ftgpio_gpio_irqchip = {
	133	.name = "FTGPIO010",
	134	.irq_ack = ftgpio_gpio_ack_irq,
	135	.irq_mask = ftgpio_gpio_mask_irq,
	136	.irq_unmask = ftgpio_gpio_unmask_irq,
	137	.irq_set_type = ftgpio_gpio_set_irq_type,
49cec4d8 LW	138	};
49cec4d8 LW	139
9d3a15aa	140	static void ftgpio_gpio_irq_handler(struct irq_desc *desc)
49cec4d8 LW	141	{
49cec4d8 LW	142	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
9d3a15aa	143	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	144	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	145	int offset;
	146	unsigned long stat;
	147
	148	chained_irq_enter(irqchip, desc);
	149
	150	stat = readl(g->base + GPIO_INT_STAT);
	151	if (stat)
	152	for_each_set_bit(offset, &stat, gc->ngpio)
f0fbe7bc	153	generic_handle_irq(irq_find_mapping(gc->irq.domain,
49cec4d8 LW	154	offset));
	155
	156	chained_irq_exit(irqchip, desc);
	157	}
	158
9d3a15aa	159	static int ftgpio_gpio_probe(struct platform_device *pdev)
49cec4d8 LW	160	{
	161	struct device *dev = &pdev->dev;
	162	struct resource *res;
9d3a15aa	163	struct ftgpio_gpio *g;
49cec4d8 LW	164	int irq;
	165	int ret;
	166
	167	g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL);
	168	if (!g)
	169	return -ENOMEM;
	170
	171	g->dev = dev;
	172
	173	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	174	g->base = devm_ioremap_resource(dev, res);
	175	if (IS_ERR(g->base))
	176	return PTR_ERR(g->base);
	177
	178	irq = platform_get_irq(pdev, 0);
	179	if (!irq)
	180	return -EINVAL;
	181
	182	ret = bgpio_init(&g->gc, dev, 4,
	183	g->base + GPIO_DATA_IN,
	184	g->base + GPIO_DATA_SET,
	185	g->base + GPIO_DATA_CLR,
	186	g->base + GPIO_DIR,
	187	NULL,
	188	0);
	189	if (ret) {
	190	dev_err(dev, "unable to init generic GPIO\n");
	191	return ret;
	192	}
9d3a15aa	193	g->gc.label = "FTGPIO010";
49cec4d8 LW	194	g->gc.base = -1;
	195	g->gc.parent = dev;
	196	g->gc.owner = THIS_MODULE;
	197	/* ngpio is set by bgpio_init() */
	198
	199	ret = devm_gpiochip_add_data(dev, &g->gc, g);
	200	if (ret)
	201	return ret;
	202
	203	/* Disable, unmask and clear all interrupts */
	204	writel(0x0, g->base + GPIO_INT_EN);
	205	writel(0x0, g->base + GPIO_INT_MASK);
	206	writel(~0x0, g->base + GPIO_INT_CLR);
	207
9d3a15aa	208	ret = gpiochip_irqchip_add(&g->gc, &ftgpio_gpio_irqchip,
49cec4d8 LW	209	0, handle_bad_irq,
	210	IRQ_TYPE_NONE);
	211	if (ret) {
	212	dev_info(dev, "could not add irqchip\n");
	213	return ret;
	214	}
9d3a15aa LW	215	gpiochip_set_chained_irqchip(&g->gc, &ftgpio_gpio_irqchip,
9d3a15aa LW	216	irq, ftgpio_gpio_irq_handler);
49cec4d8	217
9d3a15aa	218	dev_info(dev, "FTGPIO010 @%p registered\n", g->base);
49cec4d8 LW	219
	220	return 0;
	221	}
	222
9d3a15aa	223	static const struct of_device_id ftgpio_gpio_of_match[] = {
49cec4d8 LW	224	{
	225	.compatible = "cortina,gemini-gpio",
	226	},
9d3a15aa LW	227	{
	228	.compatible = "moxa,moxart-gpio",
	229	},
	230	{
	231	.compatible = "faraday,ftgpio010",
	232	},
49cec4d8 LW	233	{},
	234	};
	235
9d3a15aa	236	static struct platform_driver ftgpio_gpio_driver = {
49cec4d8	237	.driver = {
9d3a15aa LW	238	.name = "ftgpio010-gpio",
9d3a15aa LW	239	.of_match_table = of_match_ptr(ftgpio_gpio_of_match),
49cec4d8	240	},
9d3a15aa	241	.probe = ftgpio_gpio_probe,
49cec4d8	242	};
9d3a15aa	243	builtin_platform_driver(ftgpio_gpio_driver);