[deliverable/linux.git] / drivers / gpio / gpio-moxart.c

/*
 * MOXA ART SoCs GPIO driver.
 *
 * Copyright (C) 2013 Jonas Jensen
 *
 * Jonas Jensen <jonas.jensen@gmail.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/bitops.h>

#define GPIO_DATA_OUT		0x00
#define GPIO_DATA_IN		0x04
#define GPIO_PIN_DIRECTION	0x08

struct moxart_gpio_chip {
	struct gpio_chip gpio;
	void __iomem *moxart_gpio_base;
};

static inline struct moxart_gpio_chip *to_moxart_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct moxart_gpio_chip, gpio);
}

static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	return pinctrl_request_gpio(offset);
}

static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	pinctrl_free_gpio(offset);
}

static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
	void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION;

	writel(readl(ioaddr) & ~BIT(offset), ioaddr);
	return 0;
}

static int moxart_gpio_direction_output(struct gpio_chip *chip,
					unsigned offset, int value)
{
	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
	void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION;

	writel(readl(ioaddr) | BIT(offset), ioaddr);
	return 0;
}

static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
	void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_DATA_OUT;
	u32 reg = readl(ioaddr);

	if (value)
		reg = reg | BIT(offset);
	else
		reg = reg & ~BIT(offset);


	writel(reg, ioaddr);
}

static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
	u32 ret = readl(gc->moxart_gpio_base + GPIO_PIN_DIRECTION);

	if (ret & BIT(offset))
		return !!(readl(gc->moxart_gpio_base + GPIO_DATA_OUT) &
			  BIT(offset));
	else
		return !!(readl(gc->moxart_gpio_base + GPIO_DATA_IN) &
			  BIT(offset));
}

static struct gpio_chip moxart_template_chip = {
	.label			= "moxart-gpio",
	.request		= moxart_gpio_request,
	.free			= moxart_gpio_free,
	.direction_input	= moxart_gpio_direction_input,
	.direction_output	= moxart_gpio_direction_output,
	.set			= moxart_gpio_set,
	.get			= moxart_gpio_get,
	.base			= 0,
	.ngpio			= 32,
	.can_sleep		= 0,
};

static int moxart_gpio_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct moxart_gpio_chip *mgc;
	int ret;

	mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL);
	if (!mgc) {
		dev_err(dev, "can't allocate GPIO chip container\n");
		return -ENOMEM;
	}
	mgc->gpio = moxart_template_chip;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	mgc->moxart_gpio_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(mgc->moxart_gpio_base)) {
		dev_err(dev, "%s: devm_ioremap_resource res_gpio failed\n",
			dev->of_node->full_name);
		return PTR_ERR(mgc->moxart_gpio_base);
	}

	mgc->gpio.dev = dev;

	ret = gpiochip_add(&mgc->gpio);
	if (ret) {
		dev_err(dev, "%s: gpiochip_add failed\n",
			dev->of_node->full_name);
		return ret;
	}

	return 0;
}

static const struct of_device_id moxart_gpio_match[] = {
	{ .compatible = "moxa,moxart-gpio" },
	{ }
};

static struct platform_driver moxart_gpio_driver = {
	.driver	= {
		.name		= "moxart-gpio",
		.owner		= THIS_MODULE,
		.of_match_table	= moxart_gpio_match,
	},
	.probe	= moxart_gpio_probe,
};
module_platform_driver(moxart_gpio_driver);

MODULE_DESCRIPTION("MOXART GPIO chip driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
Commit	Line	Data
0299b77b JJ	1	/*
	2	* MOXA ART SoCs GPIO driver.
	3	*
	4	* Copyright (C) 2013 Jonas Jensen
	5	*
	6	* Jonas Jensen <jonas.jensen@gmail.com>
	7	*
	8	* This file is licensed under the terms of the GNU General Public
	9	* License version 2. This program is licensed "as is" without any
	10	* warranty of any kind, whether express or implied.
	11	*/
	12
	13	#include <linux/err.h>
	14	#include <linux/init.h>
	15	#include <linux/irq.h>
	16	#include <linux/io.h>
	17	#include <linux/gpio.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/module.h>
	20	#include <linux/of_address.h>
	21	#include <linux/of_gpio.h>
	22	#include <linux/pinctrl/consumer.h>
	23	#include <linux/delay.h>
	24	#include <linux/timer.h>
	25	#include <linux/bitops.h>
	26
	27	#define GPIO_DATA_OUT 0x00
	28	#define GPIO_DATA_IN 0x04
	29	#define GPIO_PIN_DIRECTION 0x08
	30
	31	struct moxart_gpio_chip {
	32	struct gpio_chip gpio;
	33	void __iomem *moxart_gpio_base;
	34	};
	35
	36	static inline struct moxart_gpio_chip to_moxart_gpio(struct gpio_chip chip)
	37	{
	38	return container_of(chip, struct moxart_gpio_chip, gpio);
	39	}
	40
	41	static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
	42	{
	43	return pinctrl_request_gpio(offset);
	44	}
	45
	46	static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset)
	47	{
	48	pinctrl_free_gpio(offset);
	49	}
	50
	51	static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
	52	{
	53	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
	54	void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION;
	55
	56	writel(readl(ioaddr) & ~BIT(offset), ioaddr);
	57	return 0;
	58	}
	59
	60	static int moxart_gpio_direction_output(struct gpio_chip *chip,
	61	unsigned offset, int value)
	62	{
	63	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
	64	void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION;
65
66	writel(readl(ioaddr) \| BIT(offset), ioaddr);
67	return 0;
68	}
69
70	static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
71	{
72	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
73	void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_DATA_OUT;
74	u32 reg = readl(ioaddr);
75
76	if (value)
77	reg = reg \| BIT(offset);
78	else
79	reg = reg & ~BIT(offset);
80
81
82	writel(reg, ioaddr);
83	}
84
85	static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
86	{
87	struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
88	u32 ret = readl(gc->moxart_gpio_base + GPIO_PIN_DIRECTION);
89
90	if (ret & BIT(offset))
91	return !!(readl(gc->moxart_gpio_base + GPIO_DATA_OUT) &
92	BIT(offset));
93	else
94	return !!(readl(gc->moxart_gpio_base + GPIO_DATA_IN) &
95	BIT(offset));
96	}
97
98	static struct gpio_chip moxart_template_chip = {
99	.label = "moxart-gpio",
100	.request = moxart_gpio_request,
101	.free = moxart_gpio_free,
102	.direction_input = moxart_gpio_direction_input,
103	.direction_output = moxart_gpio_direction_output,
104	.set = moxart_gpio_set,
105	.get = moxart_gpio_get,
106	.base = 0,
107	.ngpio = 32,
108	.can_sleep = 0,
109	};
110
111	static int moxart_gpio_probe(struct platform_device *pdev)
112	{
113	struct device *dev = &pdev->dev;
114	struct resource *res;
115	struct moxart_gpio_chip *mgc;
116	int ret;
117
118	mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL);
119	if (!mgc) {
120	dev_err(dev, "can't allocate GPIO chip container\n");
121	return -ENOMEM;
122	}
123	mgc->gpio = moxart_template_chip;
124
125	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
126	mgc->moxart_gpio_base = devm_ioremap_resource(dev, res);
127	if (IS_ERR(mgc->moxart_gpio_base)) {
128	dev_err(dev, "%s: devm_ioremap_resource res_gpio failed\n",
129	dev->of_node->full_name);
130	return PTR_ERR(mgc->moxart_gpio_base);
131	}
132
133	mgc->gpio.dev = dev;
134
135	ret = gpiochip_add(&mgc->gpio);
136	if (ret) {
137	dev_err(dev, "%s: gpiochip_add failed\n",
138	dev->of_node->full_name);
139	return ret;
140	}
141
142	return 0;
143	}
144
145	static const struct of_device_id moxart_gpio_match[] = {
146	{ .compatible = "moxa,moxart-gpio" },
147	{ }
148	};
149
150	static struct platform_driver moxart_gpio_driver = {
151	.driver = {
152	.name = "moxart-gpio",
153	.owner = THIS_MODULE,
154	.of_match_table = moxart_gpio_match,
155	},
156	.probe = moxart_gpio_probe,
157	};
158	module_platform_driver(moxart_gpio_driver);
159
160	MODULE_DESCRIPTION("MOXART GPIO chip driver");
161	MODULE_LICENSE("GPL");
162	MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");