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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> | |
26 | ||
27 | #define GPIO_DATA_OUT 0x00 | |
28 | #define GPIO_DATA_IN 0x04 | |
29 | #define GPIO_PIN_DIRECTION 0x08 | |
30 | ||
31 | struct moxart_gpio_chip { | |
32 | struct gpio_chip gpio; | |
a87854da | 33 | void __iomem *base; |
0299b77b JJ |
34 | }; |
35 | ||
36 | static inline struct moxart_gpio_chip *to_moxart_gpio(struct gpio_chip *chip) | |
37 | { | |
38 | return container_of(chip, struct moxart_gpio_chip, gpio); | |
39 | } | |
40 | ||
41 | static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset) | |
42 | { | |
43 | return pinctrl_request_gpio(offset); | |
44 | } | |
45 | ||
46 | static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset) | |
47 | { | |
48 | pinctrl_free_gpio(offset); | |
49 | } | |
50 | ||
0299b77b JJ |
51 | static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
52 | { | |
53 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
a87854da | 54 | void __iomem *ioaddr = gc->base + GPIO_DATA_OUT; |
0299b77b JJ |
55 | u32 reg = readl(ioaddr); |
56 | ||
57 | if (value) | |
58 | reg = reg | BIT(offset); | |
59 | else | |
60 | reg = reg & ~BIT(offset); | |
61 | ||
0299b77b JJ |
62 | writel(reg, ioaddr); |
63 | } | |
64 | ||
65 | static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset) | |
66 | { | |
67 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
a87854da | 68 | u32 ret = readl(gc->base + GPIO_PIN_DIRECTION); |
0299b77b JJ |
69 | |
70 | if (ret & BIT(offset)) | |
a87854da | 71 | return !!(readl(gc->base + GPIO_DATA_OUT) & BIT(offset)); |
0299b77b | 72 | else |
a87854da | 73 | return !!(readl(gc->base + GPIO_DATA_IN) & BIT(offset)); |
0299b77b JJ |
74 | } |
75 | ||
c9e8dbad AL |
76 | static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
77 | { | |
78 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
79 | void __iomem *ioaddr = gc->base + GPIO_PIN_DIRECTION; | |
80 | ||
81 | writel(readl(ioaddr) & ~BIT(offset), ioaddr); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static int moxart_gpio_direction_output(struct gpio_chip *chip, | |
86 | unsigned offset, int value) | |
87 | { | |
88 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
89 | void __iomem *ioaddr = gc->base + GPIO_PIN_DIRECTION; | |
90 | ||
fc860356 | 91 | moxart_gpio_set(chip, offset, value); |
c9e8dbad AL |
92 | writel(readl(ioaddr) | BIT(offset), ioaddr); |
93 | return 0; | |
94 | } | |
95 | ||
0299b77b JJ |
96 | static struct gpio_chip moxart_template_chip = { |
97 | .label = "moxart-gpio", | |
98 | .request = moxart_gpio_request, | |
99 | .free = moxart_gpio_free, | |
100 | .direction_input = moxart_gpio_direction_input, | |
101 | .direction_output = moxart_gpio_direction_output, | |
102 | .set = moxart_gpio_set, | |
103 | .get = moxart_gpio_get, | |
0299b77b | 104 | .ngpio = 32, |
50d7c9c8 | 105 | .owner = THIS_MODULE, |
0299b77b JJ |
106 | }; |
107 | ||
108 | static int moxart_gpio_probe(struct platform_device *pdev) | |
109 | { | |
110 | struct device *dev = &pdev->dev; | |
111 | struct resource *res; | |
112 | struct moxart_gpio_chip *mgc; | |
113 | int ret; | |
114 | ||
115 | mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL); | |
40b295fa | 116 | if (!mgc) |
0299b77b | 117 | return -ENOMEM; |
0299b77b JJ |
118 | mgc->gpio = moxart_template_chip; |
119 | ||
120 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
a87854da | 121 | mgc->base = devm_ioremap_resource(dev, res); |
ca0ae81d | 122 | if (IS_ERR(mgc->base)) |
a87854da | 123 | return PTR_ERR(mgc->base); |
0299b77b JJ |
124 | |
125 | mgc->gpio.dev = dev; | |
126 | ||
127 | ret = gpiochip_add(&mgc->gpio); | |
128 | if (ret) { | |
129 | dev_err(dev, "%s: gpiochip_add failed\n", | |
130 | dev->of_node->full_name); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static const struct of_device_id moxart_gpio_match[] = { | |
138 | { .compatible = "moxa,moxart-gpio" }, | |
139 | { } | |
140 | }; | |
141 | ||
142 | static struct platform_driver moxart_gpio_driver = { | |
143 | .driver = { | |
144 | .name = "moxart-gpio", | |
145 | .owner = THIS_MODULE, | |
146 | .of_match_table = moxart_gpio_match, | |
147 | }, | |
148 | .probe = moxart_gpio_probe, | |
149 | }; | |
150 | module_platform_driver(moxart_gpio_driver); | |
151 | ||
152 | MODULE_DESCRIPTION("MOXART GPIO chip driver"); | |
153 | MODULE_LICENSE("GPL"); | |
154 | MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); |