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/platform_device.h>
18#include <linux/module.h>
19#include <linux/of_address.h>
20#include <linux/of_gpio.h>
21#include <linux/pinctrl/consumer.h>
22#include <linux/delay.h>
23#include <linux/timer.h>
24#include <linux/bitops.h>
25#include <linux/gpio/driver.h>
26
27#define GPIO_DATA_OUT		0x00
28#define GPIO_DATA_IN		0x04
29#define GPIO_PIN_DIRECTION	0x08
30
31static int moxart_gpio_probe(struct platform_device *pdev)
32{
33	struct device *dev = &pdev->dev;
34	struct resource *res;
35	struct gpio_chip *gc;
36	void __iomem *base;
37	int ret;
38
39	gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
40	if (!gc)
41		return -ENOMEM;
42
43	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
44	base = devm_ioremap_resource(dev, res);
45	if (IS_ERR(base))
46		return PTR_ERR(base);
47
48	ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN,
49			 base + GPIO_DATA_OUT, NULL,
50			 base + GPIO_PIN_DIRECTION, NULL,
51			 BGPIOF_READ_OUTPUT_REG_SET);
52	if (ret) {
53		dev_err(&pdev->dev, "bgpio_init failed\n");
54		return ret;
55	}
56
57	gc->label = "moxart-gpio";
58	gc->request = gpiochip_generic_request;
59	gc->free = gpiochip_generic_free;
60	gc->base = 0;
61	gc->owner = THIS_MODULE;
62
63	ret = devm_gpiochip_add_data(dev, gc, NULL);
64	if (ret) {
65		dev_err(dev, "%s: gpiochip_add failed\n",
66			dev->of_node->full_name);
67		return ret;
68	}
69
70	return ret;
71}
72
73static const struct of_device_id moxart_gpio_match[] = {
74	{ .compatible = "moxa,moxart-gpio" },
75	{ }
76};
77
78static struct platform_driver moxart_gpio_driver = {
79	.driver	= {
80		.name		= "moxart-gpio",
81		.of_match_table	= moxart_gpio_match,
82	},
83	.probe	= moxart_gpio_probe,
84};
85module_platform_driver(moxart_gpio_driver);
86
87MODULE_DESCRIPTION("MOXART GPIO chip driver");
88MODULE_LICENSE("GPL");
89MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");