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/gpio.h>
18#include <linux/platform_device.h>
19#include <linux/module.h>
20#include <linux/of_address.h>
21#include <linux/of_gpio.h>
22#include <linux/pinctrl/consumer.h>
23#include <linux/delay.h>
24#include <linux/timer.h>
25#include <linux/bitops.h>
26#include <linux/basic_mmio_gpio.h>
27
28#define GPIO_DATA_OUT		0x00
29#define GPIO_DATA_IN		0x04
30#define GPIO_PIN_DIRECTION	0x08
31
32static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
33{
34	return pinctrl_request_gpio(offset);
35}
36
37static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset)
38{
39	pinctrl_free_gpio(offset);
40}
41
42static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
43{
44	struct bgpio_chip *bgc = to_bgpio_chip(chip);
45	u32 ret = bgc->read_reg(bgc->reg_dir);
46
47	if (ret & BIT(offset))
48		return !!(bgc->read_reg(bgc->reg_set) & BIT(offset));
49	else
50		return !!(bgc->read_reg(bgc->reg_dat) & BIT(offset));
51}
52
53static int moxart_gpio_probe(struct platform_device *pdev)
54{
55	struct device *dev = &pdev->dev;
56	struct resource *res;
57	struct bgpio_chip *bgc;
58	void __iomem *base;
59	int ret;
60
61	bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL);
62	if (!bgc)
63		return -ENOMEM;
64
65	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
66	base = devm_ioremap_resource(dev, res);
67	if (IS_ERR(base))
68		return PTR_ERR(base);
69
70	ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN,
71		    base + GPIO_DATA_OUT, NULL,
72		    base + GPIO_PIN_DIRECTION, NULL, 0);
73	if (ret) {
74		dev_err(&pdev->dev, "bgpio_init failed\n");
75		return ret;
76	}
77
78	bgc->gc.label = "moxart-gpio";
79	bgc->gc.request = moxart_gpio_request;
80	bgc->gc.free = moxart_gpio_free;
81	bgc->gc.get = moxart_gpio_get;
82	bgc->data = bgc->read_reg(bgc->reg_set);
83	bgc->gc.base = 0;
84	bgc->gc.ngpio = 32;
85	bgc->gc.dev = dev;
86	bgc->gc.owner = THIS_MODULE;
87
88	ret = gpiochip_add(&bgc->gc);
89	if (ret) {
90		dev_err(dev, "%s: gpiochip_add failed\n",
91			dev->of_node->full_name);
92		return ret;
93	}
94
95	return ret;
96}
97
98static const struct of_device_id moxart_gpio_match[] = {
99	{ .compatible = "moxa,moxart-gpio" },
100	{ }
101};
102
103static struct platform_driver moxart_gpio_driver = {
104	.driver	= {
105		.name		= "moxart-gpio",
106		.of_match_table	= moxart_gpio_match,
107	},
108	.probe	= moxart_gpio_probe,
109};
110module_platform_driver(moxart_gpio_driver);
111
112MODULE_DESCRIPTION("MOXART GPIO chip driver");
113MODULE_LICENSE("GPL");
114MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
115