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

/*
 * Driver for GE FPGA based GPIO
 *
 * Author: Martyn Welch <martyn.welch@ge.com>
 *
 * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
 *
 * 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.
 */

/* TODO
 *
 * Configuration of output modes (totem-pole/open-drain)
 * Interrupt configuration - interrupts are always generated the FPGA relies on
 * the I/O interrupt controllers mask to stop them propergating
 */

#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/module.h>

#define GEF_GPIO_DIRECT		0x00
#define GEF_GPIO_IN		0x04
#define GEF_GPIO_OUT		0x08
#define GEF_GPIO_TRIG		0x0C
#define GEF_GPIO_POLAR_A	0x10
#define GEF_GPIO_POLAR_B	0x14
#define GEF_GPIO_INT_STAT	0x18
#define GEF_GPIO_OVERRUN	0x1C
#define GEF_GPIO_MODE		0x20

static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
	unsigned int data;

	data = ioread32be(mmchip->regs + GEF_GPIO_OUT);
	if (value)
		data = data | BIT(offset);
	else
		data = data & ~BIT(offset);
	iowrite32be(data, mmchip->regs + GEF_GPIO_OUT);
}

static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
{
	unsigned int data;
	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);

	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
	data = data | BIT(offset);
	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);

	return 0;
}

static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
{
	unsigned int data;
	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);

	/* Set value before switching to output */
	gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);

	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
	data = data & ~BIT(offset);
	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);

	return 0;
}

static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);

	return !!(ioread32be(mmchip->regs + GEF_GPIO_IN) & BIT(offset));
}

static const struct of_device_id gef_gpio_ids[] = {
	{
		.compatible	= "gef,sbc610-gpio",
		.data		= (void *)19,
	}, {
		.compatible	= "gef,sbc310-gpio",
		.data		= (void *)6,
	}, {
		.compatible	= "ge,imp3a-gpio",
		.data		= (void *)16,
	},
	{ }
};
MODULE_DEVICE_TABLE(of, gef_gpio_ids);

static int __init gef_gpio_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id =
		of_match_device(gef_gpio_ids, &pdev->dev);
	struct of_mm_gpio_chip *mmchip;

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

	/* Setup pointers to chip functions */
	mmchip->gc.ngpio = (u16)(uintptr_t)of_id->data;
	mmchip->gc.of_gpio_n_cells = 2;
	mmchip->gc.direction_input = gef_gpio_dir_in;
	mmchip->gc.direction_output = gef_gpio_dir_out;
	mmchip->gc.get = gef_gpio_get;
	mmchip->gc.set = gef_gpio_set;

	/* This function adds a memory mapped GPIO chip */
	return of_mm_gpiochip_add(pdev->dev.of_node, mmchip);
};

static struct platform_driver gef_gpio_driver = {
	.driver = {
		.name		= "gef-gpio",
		.owner		= THIS_MODULE,
		.of_match_table	= gef_gpio_ids,
	},
};
module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);

MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
MODULE_LICENSE("GPL");
Commit	Line	Data
965dc5fc	1	/*
948e78c3	2	* Driver for GE FPGA based GPIO
965dc5fc	3	*
948e78c3	4	* Author: Martyn Welch <martyn.welch@ge.com>
965dc5fc	5	*
948e78c3	6	* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
965dc5fc MW	7	*
	8	* This file is licensed under the terms of the GNU General Public License
	9	* version 2. This program is licensed "as is" without any warranty of any
	10	* kind, whether express or implied.
	11	*/
	12
	13	/* TODO
	14	*
	15	* Configuration of output modes (totem-pole/open-drain)
	16	* Interrupt configuration - interrupts are always generated the FPGA relies on
6518bb69	17	* the I/O interrupt controllers mask to stop them propergating
965dc5fc MW	18	*/
	19
	20	#include <linux/kernel.h>
965dc5fc	21	#include <linux/io.h>
965dc5fc	22	#include <linux/of_device.h>
965dc5fc	23	#include <linux/of_gpio.h>
7dfe293c	24	#include <linux/module.h>
965dc5fc MW	25
	26	#define GEF_GPIO_DIRECT 0x00
	27	#define GEF_GPIO_IN 0x04
	28	#define GEF_GPIO_OUT 0x08
	29	#define GEF_GPIO_TRIG 0x0C
	30	#define GEF_GPIO_POLAR_A 0x10
	31	#define GEF_GPIO_POLAR_B 0x14
	32	#define GEF_GPIO_INT_STAT 0x18
	33	#define GEF_GPIO_OVERRUN 0x1C
	34	#define GEF_GPIO_MODE 0x20
	35
9dacc6de	36	static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
965dc5fc	37	{
9dacc6de	38	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
965dc5fc MW	39	unsigned int data;
965dc5fc MW	40
9dacc6de AS	41	data = ioread32be(mmchip->regs + GEF_GPIO_OUT);
	42	if (value)
	43	data = data \| BIT(offset);
965dc5fc	44	else
9dacc6de AS	45	data = data & ~BIT(offset);
9dacc6de AS	46	iowrite32be(data, mmchip->regs + GEF_GPIO_OUT);
965dc5fc MW	47	}
965dc5fc MW	48
965dc5fc MW	49	static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
	50	{
	51	unsigned int data;
	52	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
	53
	54	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
9dacc6de	55	data = data \| BIT(offset);
965dc5fc MW	56	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
	57
	58	return 0;
	59	}
	60
	61	static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
	62	{
	63	unsigned int data;
	64	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
	65
9dacc6de AS	66	/* Set value before switching to output */
9dacc6de AS	67	gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
965dc5fc MW	68
965dc5fc MW	69	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
9dacc6de	70	data = data & ~BIT(offset);
965dc5fc MW	71	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
	72
	73	return 0;
	74	}
	75
	76	static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
	77	{
965dc5fc MW	78	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
965dc5fc MW	79
9dacc6de	80	return !!(ioread32be(mmchip->regs + GEF_GPIO_IN) & BIT(offset));
965dc5fc MW	81	}
965dc5fc MW	82
9dacc6de AS	83	static const struct of_device_id gef_gpio_ids[] = {
	84	{
	85	.compatible = "gef,sbc610-gpio",
	86	.data = (void *)19,
	87	}, {
	88	.compatible = "gef,sbc310-gpio",
	89	.data = (void *)6,
	90	}, {
	91	.compatible = "ge,imp3a-gpio",
	92	.data = (void *)16,
	93	},
	94	{ }
	95	};
	96	MODULE_DEVICE_TABLE(of, gef_gpio_ids);
965dc5fc	97
9dacc6de	98	static int __init gef_gpio_probe(struct platform_device *pdev)
965dc5fc	99	{
9dacc6de AS	100	const struct of_device_id *of_id =
	101	of_match_device(gef_gpio_ids, &pdev->dev);
	102	struct of_mm_gpio_chip *mmchip;
	103
	104	mmchip = devm_kzalloc(&pdev->dev, sizeof(*mmchip), GFP_KERNEL);
	105	if (!mmchip)
	106	return -ENOMEM;
	107
	108	/* Setup pointers to chip functions */
	109	mmchip->gc.ngpio = (u16)(uintptr_t)of_id->data;
	110	mmchip->gc.of_gpio_n_cells = 2;
	111	mmchip->gc.direction_input = gef_gpio_dir_in;
	112	mmchip->gc.direction_output = gef_gpio_dir_out;
	113	mmchip->gc.get = gef_gpio_get;
	114	mmchip->gc.set = gef_gpio_set;
	115
	116	/* This function adds a memory mapped GPIO chip */
	117	return of_mm_gpiochip_add(pdev->dev.of_node, mmchip);
	118	};
e041013a	119
9dacc6de AS	120	static struct platform_driver gef_gpio_driver = {
	121	.driver = {
	122	.name = "gef-gpio",
	123	.owner = THIS_MODULE,
	124	.of_match_table = gef_gpio_ids,
	125	},
965dc5fc	126	};
9dacc6de	127	module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
965dc5fc	128
948e78c3 MW	129	MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
948e78c3 MW	130	MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
965dc5fc	131	MODULE_LICENSE("GPL");