[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/of_address.h>
#include <linux/module.h>
#include <linux/basic_mmio_gpio.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 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 bgpio_chip *bgc;
	void __iomem *regs;
	int ret;

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

	regs = of_iomap(pdev->dev.of_node, 0);
	if (!regs)
		return -ENOMEM;

	ret = bgpio_init(bgc, &pdev->dev, 4, regs + GEF_GPIO_IN,
			 regs + GEF_GPIO_OUT, NULL, NULL,
			 regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
	if (ret) {
		dev_err(&pdev->dev, "bgpio_init failed\n");
		goto err0;
	}

	/* Setup pointers to chip functions */
	bgc->gc.label = kstrdup(pdev->dev.of_node->full_name, GFP_KERNEL);
	if (!bgc->gc.label)
		goto err0;

	bgc->gc.base = -1;
	bgc->gc.ngpio = (u16)(uintptr_t)of_id->data;
	bgc->gc.of_gpio_n_cells = 2;
	bgc->gc.of_node = pdev->dev.of_node;

	/* This function adds a memory mapped GPIO chip */
	ret = gpiochip_add(&bgc->gc);
	if (ret)
		goto err1;

	return 0;
err1:
	kfree(bgc->gc.label);
err0:
	iounmap(regs);
	pr_err("%s: GPIO chip registration failed\n",
			pdev->dev.of_node->full_name);
	return ret;
};

static struct platform_driver gef_gpio_driver = {
	.driver = {
		.name		= "gef-gpio",
		.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>
866010fb	24	#include <linux/of_address.h>
7dfe293c	25	#include <linux/module.h>
866010fb	26	#include <linux/basic_mmio_gpio.h>
965dc5fc MW	27
	28	#define GEF_GPIO_DIRECT 0x00
	29	#define GEF_GPIO_IN 0x04
	30	#define GEF_GPIO_OUT 0x08
	31	#define GEF_GPIO_TRIG 0x0C
	32	#define GEF_GPIO_POLAR_A 0x10
	33	#define GEF_GPIO_POLAR_B 0x14
	34	#define GEF_GPIO_INT_STAT 0x18
	35	#define GEF_GPIO_OVERRUN 0x1C
	36	#define GEF_GPIO_MODE 0x20
	37
9dacc6de AS	38	static const struct of_device_id gef_gpio_ids[] = {
	39	{
	40	.compatible = "gef,sbc610-gpio",
	41	.data = (void *)19,
	42	}, {
	43	.compatible = "gef,sbc310-gpio",
	44	.data = (void *)6,
	45	}, {
	46	.compatible = "ge,imp3a-gpio",
	47	.data = (void *)16,
	48	},
	49	{ }
	50	};
	51	MODULE_DEVICE_TABLE(of, gef_gpio_ids);
965dc5fc	52
9dacc6de	53	static int __init gef_gpio_probe(struct platform_device *pdev)
965dc5fc	54	{
9dacc6de AS	55	const struct of_device_id *of_id =
9dacc6de AS	56	of_match_device(gef_gpio_ids, &pdev->dev);
866010fb KP	57	struct bgpio_chip *bgc;
	58	void __iomem *regs;
	59	int ret;
9dacc6de	60
866010fb KP	61	bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
866010fb KP	62	if (!bgc)
9dacc6de AS	63	return -ENOMEM;
9dacc6de AS	64
866010fb KP	65	regs = of_iomap(pdev->dev.of_node, 0);
	66	if (!regs)
	67	return -ENOMEM;
	68
	69	ret = bgpio_init(bgc, &pdev->dev, 4, regs + GEF_GPIO_IN,
	70	regs + GEF_GPIO_OUT, NULL, NULL,
	71	regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
	72	if (ret) {
	73	dev_err(&pdev->dev, "bgpio_init failed\n");
	74	goto err0;
	75	}
	76
9dacc6de	77	/* Setup pointers to chip functions */
866010fb KP	78	bgc->gc.label = kstrdup(pdev->dev.of_node->full_name, GFP_KERNEL);
	79	if (!bgc->gc.label)
	80	goto err0;
	81
	82	bgc->gc.base = -1;
	83	bgc->gc.ngpio = (u16)(uintptr_t)of_id->data;
	84	bgc->gc.of_gpio_n_cells = 2;
	85	bgc->gc.of_node = pdev->dev.of_node;
9dacc6de AS	86
9dacc6de AS	87	/* This function adds a memory mapped GPIO chip */
866010fb KP	88	ret = gpiochip_add(&bgc->gc);
	89	if (ret)
	90	goto err1;
	91
	92	return 0;
	93	err1:
	94	kfree(bgc->gc.label);
	95	err0:
	96	iounmap(regs);
	97	pr_err("%s: GPIO chip registration failed\n",
	98	pdev->dev.of_node->full_name);
	99	return ret;
9dacc6de	100	};
e041013a	101
9dacc6de AS	102	static struct platform_driver gef_gpio_driver = {
	103	.driver = {
	104	.name = "gef-gpio",
9dacc6de AS	105	.of_match_table = gef_gpio_ids,
9dacc6de AS	106	},
965dc5fc	107	};
9dacc6de	108	module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
965dc5fc	109
948e78c3 MW	110	MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
948e78c3 MW	111	MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
965dc5fc	112	MODULE_LICENSE("GPL");