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
moxart_gpio_probe(struct platform_device * pdev)32 static int moxart_gpio_probe(struct platform_device *pdev)
33 {
34 struct device *dev = &pdev->dev;
35 struct resource *res;
36 struct bgpio_chip *bgc;
37 void __iomem *base;
38 int ret;
39
40 bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL);
41 if (!bgc)
42 return -ENOMEM;
43
44 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
45 base = devm_ioremap_resource(dev, res);
46 if (IS_ERR(base))
47 return PTR_ERR(base);
48
49 ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN,
50 base + GPIO_DATA_OUT, NULL,
51 base + GPIO_PIN_DIRECTION, NULL,
52 BGPIOF_READ_OUTPUT_REG_SET);
53 if (ret) {
54 dev_err(&pdev->dev, "bgpio_init failed\n");
55 return ret;
56 }
57
58 bgc->gc.label = "moxart-gpio";
59 bgc->gc.request = gpiochip_generic_request;
60 bgc->gc.free = gpiochip_generic_free;
61 bgc->data = bgc->read_reg(bgc->reg_set);
62 bgc->gc.base = 0;
63 bgc->gc.ngpio = 32;
64 bgc->gc.dev = dev;
65 bgc->gc.owner = THIS_MODULE;
66
67 ret = gpiochip_add(&bgc->gc);
68 if (ret) {
69 dev_err(dev, "%s: gpiochip_add failed\n",
70 dev->of_node->full_name);
71 return ret;
72 }
73
74 return ret;
75 }
76
77 static const struct of_device_id moxart_gpio_match[] = {
78 { .compatible = "moxa,moxart-gpio" },
79 { }
80 };
81
82 static struct platform_driver moxart_gpio_driver = {
83 .driver = {
84 .name = "moxart-gpio",
85 .of_match_table = moxart_gpio_match,
86 },
87 .probe = moxart_gpio_probe,
88 };
89 module_platform_driver(moxart_gpio_driver);
90
91 MODULE_DESCRIPTION("MOXART GPIO chip driver");
92 MODULE_LICENSE("GPL");
93 MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
94