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

/*
 * Driver for GE FPGA based GPIO
 *
 * Author: Martyn Welch <[email protected]>
 *
 * 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/slab.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/gpio/driver.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)
{
	struct gpio_chip *gc;
	void __iomem *regs;
	int ret;

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

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

	ret = bgpio_init(gc, &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 */
	gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
	if (!gc->label) {
		ret = -ENOMEM;
		goto err0;
	}

	gc->base = -1;
	gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
	gc->of_gpio_n_cells = 2;
	gc->of_node = pdev->dev.of_node;

	/* This function adds a memory mapped GPIO chip */
	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
	if (ret)
		goto err0;

	return 0;
err0:
	iounmap(regs);
	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
	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 <[email protected]");
MODULE_LICENSE("GPL");
Commit	Line	Data
965dc5fc	1	/*
948e78c3	2	* Driver for GE FPGA based GPIO
965dc5fc	3	*
948e78c3	4	* Author: Martyn Welch <[email protected]>
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>
a0b66e3f	22	#include <linux/slab.h>
965dc5fc	23	#include <linux/of_device.h>
866010fb	24	#include <linux/of_address.h>
7dfe293c	25	#include <linux/module.h>
0f4630f3	26	#include <linux/gpio/driver.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	{
0f4630f3	55	struct gpio_chip *gc;
866010fb KP	56	void __iomem *regs;
866010fb KP	57	int ret;
9dacc6de	58
0f4630f3 LW	59	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
0f4630f3 LW	60	if (!gc)
9dacc6de AS	61	return -ENOMEM;
9dacc6de AS	62
866010fb KP	63	regs = of_iomap(pdev->dev.of_node, 0);
	64	if (!regs)
	65	return -ENOMEM;
	66
0f4630f3	67	ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
866010fb KP	68	regs + GEF_GPIO_OUT, NULL, NULL,
	69	regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
	70	if (ret) {
	71	dev_err(&pdev->dev, "bgpio_init failed\n");
	72	goto err0;
	73	}
	74
9dacc6de	75	/* Setup pointers to chip functions */
7eb6ce2f	76	gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
0f4630f3	77	if (!gc->label) {
74b18de9	78	ret = -ENOMEM;
866010fb	79	goto err0;
74b18de9	80	}
866010fb	81
0f4630f3	82	gc->base = -1;
668f0657	83	gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
0f4630f3 LW	84	gc->of_gpio_n_cells = 2;
0f4630f3 LW	85	gc->of_node = pdev->dev.of_node;
9dacc6de AS	86
9dacc6de AS	87	/* This function adds a memory mapped GPIO chip */
ad2261ca	88	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
866010fb	89	if (ret)
74b18de9	90	goto err0;
866010fb KP	91
866010fb KP	92	return 0;
866010fb KP	93	err0:
866010fb KP	94	iounmap(regs);
7eb6ce2f	95	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
866010fb	96	return ret;
9dacc6de	97	};
e041013a	98
9dacc6de AS	99	static struct platform_driver gef_gpio_driver = {
	100	.driver = {
	101	.name = "gef-gpio",
9dacc6de AS	102	.of_match_table = gef_gpio_ids,
9dacc6de AS	103	},
965dc5fc	104	};
9dacc6de	105	module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
965dc5fc	106
948e78c3 MW	107	MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
948e78c3 MW	108	MODULE_AUTHOR("Martyn Welch <[email protected]");
965dc5fc	109	MODULE_LICENSE("GPL");