Commit | Line | Data |
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0299b77b JJ |
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> | |
3c01b9a8 | 26 | #include <linux/basic_mmio_gpio.h> |
0299b77b JJ |
27 | |
28 | #define GPIO_DATA_OUT 0x00 | |
29 | #define GPIO_DATA_IN 0x04 | |
30 | #define GPIO_PIN_DIRECTION 0x08 | |
31 | ||
0299b77b JJ |
32 | static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset) |
33 | { | |
34 | return pinctrl_request_gpio(offset); | |
35 | } | |
36 | ||
37 | static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset) | |
38 | { | |
39 | pinctrl_free_gpio(offset); | |
40 | } | |
41 | ||
0299b77b JJ |
42 | static int moxart_gpio_probe(struct platform_device *pdev) |
43 | { | |
44 | struct device *dev = &pdev->dev; | |
45 | struct resource *res; | |
3c01b9a8 KP |
46 | struct bgpio_chip *bgc; |
47 | void __iomem *base; | |
0299b77b JJ |
48 | int ret; |
49 | ||
3c01b9a8 KP |
50 | bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL); |
51 | if (!bgc) | |
0299b77b | 52 | return -ENOMEM; |
0299b77b JJ |
53 | |
54 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
3c01b9a8 KP |
55 | base = devm_ioremap_resource(dev, res); |
56 | if (IS_ERR(base)) | |
57 | return PTR_ERR(base); | |
0299b77b | 58 | |
3c01b9a8 | 59 | ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN, |
f3066339 VZ |
60 | base + GPIO_DATA_OUT, NULL, |
61 | base + GPIO_PIN_DIRECTION, NULL, | |
62 | BGPIOF_READ_OUTPUT_REG_SET); | |
3c01b9a8 KP |
63 | if (ret) { |
64 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
65 | return ret; | |
66 | } | |
0299b77b | 67 | |
3c01b9a8 KP |
68 | bgc->gc.label = "moxart-gpio"; |
69 | bgc->gc.request = moxart_gpio_request; | |
70 | bgc->gc.free = moxart_gpio_free; | |
3c01b9a8 KP |
71 | bgc->data = bgc->read_reg(bgc->reg_set); |
72 | bgc->gc.base = 0; | |
73 | bgc->gc.ngpio = 32; | |
74 | bgc->gc.dev = dev; | |
75 | bgc->gc.owner = THIS_MODULE; | |
76 | ||
77 | ret = gpiochip_add(&bgc->gc); | |
0299b77b JJ |
78 | if (ret) { |
79 | dev_err(dev, "%s: gpiochip_add failed\n", | |
80 | dev->of_node->full_name); | |
81 | return ret; | |
82 | } | |
83 | ||
3c01b9a8 | 84 | return ret; |
0299b77b JJ |
85 | } |
86 | ||
87 | static const struct of_device_id moxart_gpio_match[] = { | |
88 | { .compatible = "moxa,moxart-gpio" }, | |
89 | { } | |
90 | }; | |
91 | ||
92 | static struct platform_driver moxart_gpio_driver = { | |
93 | .driver = { | |
94 | .name = "moxart-gpio", | |
0299b77b JJ |
95 | .of_match_table = moxart_gpio_match, |
96 | }, | |
97 | .probe = moxart_gpio_probe, | |
98 | }; | |
99 | module_platform_driver(moxart_gpio_driver); | |
100 | ||
101 | MODULE_DESCRIPTION("MOXART GPIO chip driver"); | |
102 | MODULE_LICENSE("GPL"); | |
103 | MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); |