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