[linux-block.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/bitops.h>
#include <linux/clk.h>

/* GPIO registers definition */
#define GPIO_DATA_OUT		0x00
#define GPIO_DATA_IN		0x04
#define GPIO_DIR		0x08
#define GPIO_BYPASS_IN		0x0C
#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_RAW	0x24
#define GPIO_INT_STAT_MASKED	0x28
#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
 * @base: remapped I/O-memory base
 * @clk: silicon clock
 */
struct ftgpio_gpio {
	struct device *dev;
	struct gpio_chip gc;
	void __iomem *base;
	struct clk *clk;
};

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);
	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
}

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;

	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
	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 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_RAW);
	if (stat)
		for_each_set_bit(offset, &stat, gc->ngpio)
			generic_handle_domain_irq(gc->irq.domain, offset);

	chained_irq_exit(irqchip, desc);
}

static int ftgpio_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
				  unsigned long config)
{
	enum pin_config_param param = pinconf_to_config_param(config);
	u32 arg = pinconf_to_config_argument(config);
	struct ftgpio_gpio *g = gpiochip_get_data(gc);
	unsigned long pclk_freq;
	u32 deb_div;
	u32 val;

	if (param != PIN_CONFIG_INPUT_DEBOUNCE)
		return -ENOTSUPP;

	/*
	 * Debounce only works if interrupts are enabled. The manual
	 * states that if PCLK is 66 MHz, and this is set to 0x7D0, then
	 * PCLK is divided down to 33 kHz for the debounce timer. 0x7D0 is
	 * 2000 decimal, so what they mean is simply that the PCLK is
	 * divided by this value.
	 *
	 * As we get a debounce setting in microseconds, we calculate the
	 * desired period time and see if we can get a suitable debounce
	 * time.
	 */
	pclk_freq = clk_get_rate(g->clk);
	deb_div = DIV_ROUND_CLOSEST(pclk_freq, arg);

	/* This register is only 24 bits wide */
	if (deb_div > (1 << 24))
		return -ENOTSUPP;

	dev_dbg(g->dev, "prescale divisor: %08x, resulting frequency %lu Hz\n",
		deb_div, (pclk_freq/deb_div));

	val = readl(g->base + GPIO_DEBOUNCE_PRESCALE);
	if (val == deb_div) {
		/*
		 * The debounce timer happens to already be set to the
		 * desirable value, what a coincidence! We can just enable
		 * debounce on this GPIO line and return. This happens more
		 * often than you think, for example when all GPIO keys
		 * on a system are requesting the same debounce interval.
		 */
		val = readl(g->base + GPIO_DEBOUNCE_EN);
		val |= BIT(offset);
		writel(val, g->base + GPIO_DEBOUNCE_EN);
		return 0;
	}

	val = readl(g->base + GPIO_DEBOUNCE_EN);
	if (val) {
		/*
		 * Oh no! Someone is already using the debounce with
		 * another setting than what we need. Bummer.
		 */
		return -ENOTSUPP;
	}

	/* First come, first serve */
	writel(deb_div, g->base + GPIO_DEBOUNCE_PRESCALE);
	/* Enable debounce */
	val |= BIT(offset);
	writel(val, g->base + GPIO_DEBOUNCE_EN);

	return 0;
}

static const struct irq_chip ftgpio_irq_chip = {
	.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,
	.flags = IRQCHIP_IMMUTABLE,
	 GPIOCHIP_IRQ_RESOURCE_HELPERS,
};

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

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

	g->dev = dev;

	g->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(g->base))
		return PTR_ERR(g->base);

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0)
		return irq ? irq : -EINVAL;

	g->clk = devm_clk_get(dev, NULL);
	if (!IS_ERR(g->clk)) {
		ret = clk_prepare_enable(g->clk);
		if (ret)
			return ret;
	} else if (PTR_ERR(g->clk) == -EPROBE_DEFER) {
		/*
		 * Percolate deferrals, for anything else,
		 * just live without the clocking.
		 */
		return PTR_ERR(g->clk);
	}

	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");
		goto dis_clk;
	}
	g->gc.label = dev_name(dev);
	g->gc.base = -1;
	g->gc.parent = dev;
	g->gc.owner = THIS_MODULE;
	/* ngpio is set by bgpio_init() */

	/* We need a silicon clock to do debounce */
	if (!IS_ERR(g->clk))
		g->gc.set_config = ftgpio_gpio_set_config;

	girq = &g->gc.irq;
	gpio_irq_chip_set_chip(girq, &ftgpio_irq_chip);
	girq->parent_handler = ftgpio_gpio_irq_handler;
	girq->num_parents = 1;
	girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
				     GFP_KERNEL);
	if (!girq->parents) {
		ret = -ENOMEM;
		goto dis_clk;
	}
	girq->default_type = IRQ_TYPE_NONE;
	girq->handler = handle_bad_irq;
	girq->parents[0] = irq;

	/* 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);

	/* Clear any use of debounce */
	writel(0x0, g->base + GPIO_DEBOUNCE_EN);

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

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

	return 0;

dis_clk:
	clk_disable_unprepare(g->clk);

	return ret;
}

static int ftgpio_gpio_remove(struct platform_device *pdev)
{
	struct ftgpio_gpio *g = platform_get_drvdata(pdev);

	clk_disable_unprepare(g->clk);

	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,
	.remove = ftgpio_gpio_remove,
};
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>
49cec4d8	17	#include <linux/bitops.h>
da02d794	18	#include <linux/clk.h>
49cec4d8 LW	19
	20	/* GPIO registers definition */
	21	#define GPIO_DATA_OUT 0x00
	22	#define GPIO_DATA_IN 0x04
	23	#define GPIO_DIR 0x08
69a87f29	24	#define GPIO_BYPASS_IN 0x0C
49cec4d8 LW	25	#define GPIO_DATA_SET 0x10
	26	#define GPIO_DATA_CLR 0x14
	27	#define GPIO_PULL_EN 0x18
	28	#define GPIO_PULL_TYPE 0x1C
	29	#define GPIO_INT_EN 0x20
69a87f29 LW	30	#define GPIO_INT_STAT_RAW 0x24
69a87f29 LW	31	#define GPIO_INT_STAT_MASKED 0x28
49cec4d8 LW	32	#define GPIO_INT_MASK 0x2C
	33	#define GPIO_INT_CLR 0x30
	34	#define GPIO_INT_TYPE 0x34
	35	#define GPIO_INT_BOTH_EDGE 0x38
	36	#define GPIO_INT_LEVEL 0x3C
	37	#define GPIO_DEBOUNCE_EN 0x40
	38	#define GPIO_DEBOUNCE_PRESCALE 0x44
	39
	40	/**
9d3a15aa	41	* struct ftgpio_gpio - Gemini GPIO state container
49cec4d8 LW	42	* @dev: containing device for this instance
49cec4d8 LW	43	* @gc: gpiochip for this instance
da02d794 LW	44	* @base: remapped I/O-memory base
da02d794 LW	45	* @clk: silicon clock
49cec4d8	46	*/
9d3a15aa	47	struct ftgpio_gpio {
49cec4d8 LW	48	struct device *dev;
	49	struct gpio_chip gc;
	50	void __iomem *base;
da02d794	51	struct clk *clk;
49cec4d8 LW	52	};
49cec4d8 LW	53
9d3a15aa	54	static void ftgpio_gpio_ack_irq(struct irq_data *d)
49cec4d8 LW	55	{
49cec4d8 LW	56	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	57	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	58
	59	writel(BIT(irqd_to_hwirq(d)), g->base + GPIO_INT_CLR);
	60	}
	61
9d3a15aa	62	static void ftgpio_gpio_mask_irq(struct irq_data *d)
49cec4d8 LW	63	{
49cec4d8 LW	64	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	65	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	66	u32 val;
	67
	68	val = readl(g->base + GPIO_INT_EN);
	69	val &= ~BIT(irqd_to_hwirq(d));
	70	writel(val, g->base + GPIO_INT_EN);
ab637d48	71	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
49cec4d8 LW	72	}
49cec4d8 LW	73
9d3a15aa	74	static void ftgpio_gpio_unmask_irq(struct irq_data *d)
49cec4d8 LW	75	{
49cec4d8 LW	76	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	77	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	78	u32 val;
49cec4d8 LW	79
ab637d48	80	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
49cec4d8 LW	81	val = readl(g->base + GPIO_INT_EN);
	82	val \|= BIT(irqd_to_hwirq(d));
	83	writel(val, g->base + GPIO_INT_EN);
	84	}
	85
9d3a15aa	86	static int ftgpio_gpio_set_irq_type(struct irq_data *d, unsigned int type)
49cec4d8 LW	87	{
49cec4d8 LW	88	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
9d3a15aa	89	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	90	u32 mask = BIT(irqd_to_hwirq(d));
	91	u32 reg_both, reg_level, reg_type;
	92
	93	reg_type = readl(g->base + GPIO_INT_TYPE);
	94	reg_level = readl(g->base + GPIO_INT_LEVEL);
	95	reg_both = readl(g->base + GPIO_INT_BOTH_EDGE);
	96
	97	switch (type) {
	98	case IRQ_TYPE_EDGE_BOTH:
	99	irq_set_handler_locked(d, handle_edge_irq);
	100	reg_type &= ~mask;
	101	reg_both \|= mask;
	102	break;
	103	case IRQ_TYPE_EDGE_RISING:
	104	irq_set_handler_locked(d, handle_edge_irq);
	105	reg_type &= ~mask;
	106	reg_both &= ~mask;
	107	reg_level &= ~mask;
	108	break;
	109	case IRQ_TYPE_EDGE_FALLING:
	110	irq_set_handler_locked(d, handle_edge_irq);
	111	reg_type &= ~mask;
	112	reg_both &= ~mask;
	113	reg_level \|= mask;
	114	break;
	115	case IRQ_TYPE_LEVEL_HIGH:
	116	irq_set_handler_locked(d, handle_level_irq);
	117	reg_type \|= mask;
	118	reg_level &= ~mask;
	119	break;
	120	case IRQ_TYPE_LEVEL_LOW:
	121	irq_set_handler_locked(d, handle_level_irq);
	122	reg_type \|= mask;
	123	reg_level \|= mask;
	124	break;
	125	default:
	126	irq_set_handler_locked(d, handle_bad_irq);
	127	return -EINVAL;
	128	}
	129
	130	writel(reg_type, g->base + GPIO_INT_TYPE);
	131	writel(reg_level, g->base + GPIO_INT_LEVEL);
	132	writel(reg_both, g->base + GPIO_INT_BOTH_EDGE);
	133
9d3a15aa	134	ftgpio_gpio_ack_irq(d);
49cec4d8 LW	135
	136	return 0;
	137	}
	138
9d3a15aa	139	static void ftgpio_gpio_irq_handler(struct irq_desc *desc)
49cec4d8 LW	140	{
49cec4d8 LW	141	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
9d3a15aa	142	struct ftgpio_gpio *g = gpiochip_get_data(gc);
49cec4d8 LW	143	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	144	int offset;
	145	unsigned long stat;
	146
	147	chained_irq_enter(irqchip, desc);
	148
69a87f29	149	stat = readl(g->base + GPIO_INT_STAT_RAW);
49cec4d8 LW	150	if (stat)
49cec4d8 LW	151	for_each_set_bit(offset, &stat, gc->ngpio)
dbd1c54f	152	generic_handle_domain_irq(gc->irq.domain, offset);
49cec4d8 LW	153
	154	chained_irq_exit(irqchip, desc);
	155	}
	156
36f3f19a LW	157	static int ftgpio_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
	158	unsigned long config)
	159	{
	160	enum pin_config_param param = pinconf_to_config_param(config);
	161	u32 arg = pinconf_to_config_argument(config);
	162	struct ftgpio_gpio *g = gpiochip_get_data(gc);
	163	unsigned long pclk_freq;
	164	u32 deb_div;
	165	u32 val;
	166
	167	if (param != PIN_CONFIG_INPUT_DEBOUNCE)
	168	return -ENOTSUPP;
	169
	170	/*
	171	* Debounce only works if interrupts are enabled. The manual
	172	* states that if PCLK is 66 MHz, and this is set to 0x7D0, then
	173	* PCLK is divided down to 33 kHz for the debounce timer. 0x7D0 is
	174	* 2000 decimal, so what they mean is simply that the PCLK is
	175	* divided by this value.
	176	*
	177	* As we get a debounce setting in microseconds, we calculate the
	178	* desired period time and see if we can get a suitable debounce
	179	* time.
	180	*/
	181	pclk_freq = clk_get_rate(g->clk);
	182	deb_div = DIV_ROUND_CLOSEST(pclk_freq, arg);
	183
	184	/* This register is only 24 bits wide */
	185	if (deb_div > (1 << 24))
	186	return -ENOTSUPP;
	187
	188	dev_dbg(g->dev, "prescale divisor: %08x, resulting frequency %lu Hz\n",
	189	deb_div, (pclk_freq/deb_div));
	190
	191	val = readl(g->base + GPIO_DEBOUNCE_PRESCALE);
	192	if (val == deb_div) {
	193	/*
	194	* The debounce timer happens to already be set to the
1c12857c	195	* desirable value, what a coincidence! We can just enable
36f3f19a LW	196	* debounce on this GPIO line and return. This happens more
	197	* often than you think, for example when all GPIO keys
	198	* on a system are requesting the same debounce interval.
	199	*/
	200	val = readl(g->base + GPIO_DEBOUNCE_EN);
	201	val \|= BIT(offset);
	202	writel(val, g->base + GPIO_DEBOUNCE_EN);
	203	return 0;
	204	}
	205
	206	val = readl(g->base + GPIO_DEBOUNCE_EN);
	207	if (val) {
	208	/*
	209	* Oh no! Someone is already using the debounce with
	210	* another setting than what we need. Bummer.
	211	*/
	212	return -ENOTSUPP;
	213	}
	214
	215	/* First come, first serve */
	216	writel(deb_div, g->base + GPIO_DEBOUNCE_PRESCALE);
	217	/* Enable debounce */
	218	val \|= BIT(offset);
	219	writel(val, g->base + GPIO_DEBOUNCE_EN);
	220
	221	return 0;
	222	}
	223
ab637d48 LW	224	static const struct irq_chip ftgpio_irq_chip = {
	225	.name = "FTGPIO010",
	226	.irq_ack = ftgpio_gpio_ack_irq,
	227	.irq_mask = ftgpio_gpio_mask_irq,
	228	.irq_unmask = ftgpio_gpio_unmask_irq,
	229	.irq_set_type = ftgpio_gpio_set_irq_type,
	230	.flags = IRQCHIP_IMMUTABLE,
	231	GPIOCHIP_IRQ_RESOURCE_HELPERS,
	232	};
	233
9d3a15aa	234	static int ftgpio_gpio_probe(struct platform_device *pdev)
49cec4d8 LW	235	{
49cec4d8 LW	236	struct device *dev = &pdev->dev;
9d3a15aa	237	struct ftgpio_gpio *g;
42d9fc71	238	struct gpio_irq_chip *girq;
49cec4d8 LW	239	int irq;
	240	int ret;
	241
	242	g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL);
	243	if (!g)
	244	return -ENOMEM;
	245
	246	g->dev = dev;
	247
b35263db	248	g->base = devm_platform_ioremap_resource(pdev, 0);
49cec4d8 LW	249	if (IS_ERR(g->base))
	250	return PTR_ERR(g->base);
	251
	252	irq = platform_get_irq(pdev, 0);
4070a534 AY	253	if (irq <= 0)
4070a534 AY	254	return irq ? irq : -EINVAL;
49cec4d8	255
da02d794 LW	256	g->clk = devm_clk_get(dev, NULL);
	257	if (!IS_ERR(g->clk)) {
	258	ret = clk_prepare_enable(g->clk);
	259	if (ret)
	260	return ret;
	261	} else if (PTR_ERR(g->clk) == -EPROBE_DEFER) {
	262	/*
	263	* Percolate deferrals, for anything else,
	264	* just live without the clocking.
	265	*/
	266	return PTR_ERR(g->clk);
	267	}
	268
49cec4d8 LW	269	ret = bgpio_init(&g->gc, dev, 4,
	270	g->base + GPIO_DATA_IN,
	271	g->base + GPIO_DATA_SET,
	272	g->base + GPIO_DATA_CLR,
	273	g->base + GPIO_DIR,
	274	NULL,
	275	0);
	276	if (ret) {
	277	dev_err(dev, "unable to init generic GPIO\n");
da02d794	278	goto dis_clk;
49cec4d8	279	}
6de0cb80	280	g->gc.label = dev_name(dev);
49cec4d8 LW	281	g->gc.base = -1;
	282	g->gc.parent = dev;
	283	g->gc.owner = THIS_MODULE;
	284	/* ngpio is set by bgpio_init() */
	285
36f3f19a LW	286	/* We need a silicon clock to do debounce */
	287	if (!IS_ERR(g->clk))
	288	g->gc.set_config = ftgpio_gpio_set_config;
	289
42d9fc71	290	girq = &g->gc.irq;
ab637d48	291	gpio_irq_chip_set_chip(girq, &ftgpio_irq_chip);
42d9fc71 LW	292	girq->parent_handler = ftgpio_gpio_irq_handler;
	293	girq->num_parents = 1;
	294	girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
	295	GFP_KERNEL);
b1d64c71 CJ	296	if (!girq->parents) {
	297	ret = -ENOMEM;
	298	goto dis_clk;
	299	}
42d9fc71 LW	300	girq->default_type = IRQ_TYPE_NONE;
	301	girq->handler = handle_bad_irq;
	302	girq->parents[0] = irq;
	303
49cec4d8 LW	304	/* Disable, unmask and clear all interrupts */
	305	writel(0x0, g->base + GPIO_INT_EN);
	306	writel(0x0, g->base + GPIO_INT_MASK);
	307	writel(~0x0, g->base + GPIO_INT_CLR);
	308
36f3f19a LW	309	/* Clear any use of debounce */
	310	writel(0x0, g->base + GPIO_DEBOUNCE_EN);
	311
a7e42142 LW	312	ret = devm_gpiochip_add_data(dev, &g->gc, g);
	313	if (ret)
	314	goto dis_clk;
	315
da02d794	316	platform_set_drvdata(pdev, g);
9d3a15aa	317	dev_info(dev, "FTGPIO010 @%p registered\n", g->base);
49cec4d8 LW	318
49cec4d8 LW	319	return 0;
da02d794 LW	320
da02d794 LW	321	dis_clk:
a998ec3d WJ	322	clk_disable_unprepare(g->clk);
a998ec3d WJ	323
da02d794 LW	324	return ret;
	325	}
	326
	327	static int ftgpio_gpio_remove(struct platform_device *pdev)
	328	{
	329	struct ftgpio_gpio *g = platform_get_drvdata(pdev);
	330
a998ec3d WJ	331	clk_disable_unprepare(g->clk);
a998ec3d WJ	332
da02d794	333	return 0;
49cec4d8 LW	334	}
49cec4d8 LW	335
9d3a15aa	336	static const struct of_device_id ftgpio_gpio_of_match[] = {
49cec4d8 LW	337	{
	338	.compatible = "cortina,gemini-gpio",
	339	},
9d3a15aa LW	340	{
	341	.compatible = "moxa,moxart-gpio",
	342	},
	343	{
	344	.compatible = "faraday,ftgpio010",
	345	},
49cec4d8 LW	346	{},
	347	};
	348
9d3a15aa	349	static struct platform_driver ftgpio_gpio_driver = {
49cec4d8	350	.driver = {
9d3a15aa LW	351	.name = "ftgpio010-gpio",
9d3a15aa LW	352	.of_match_table = of_match_ptr(ftgpio_gpio_of_match),
49cec4d8	353	},
da02d794 LW	354	.probe = ftgpio_gpio_probe,
da02d794 LW	355	.remove = ftgpio_gpio_remove,
49cec4d8	356	};
9d3a15aa	357	builtin_platform_driver(ftgpio_gpio_driver);