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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; | |
33 | void __iomem *moxart_gpio_base; | |
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 | ||
51 | static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
52 | { | |
53 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
54 | void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION; | |
55 | ||
56 | writel(readl(ioaddr) & ~BIT(offset), ioaddr); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int moxart_gpio_direction_output(struct gpio_chip *chip, | |
61 | unsigned offset, int value) | |
62 | { | |
63 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
64 | void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_PIN_DIRECTION; | |
65 | ||
66 | writel(readl(ioaddr) | BIT(offset), ioaddr); | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
71 | { | |
72 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
73 | void __iomem *ioaddr = gc->moxart_gpio_base + GPIO_DATA_OUT; | |
74 | u32 reg = readl(ioaddr); | |
75 | ||
76 | if (value) | |
77 | reg = reg | BIT(offset); | |
78 | else | |
79 | reg = reg & ~BIT(offset); | |
80 | ||
81 | ||
82 | writel(reg, ioaddr); | |
83 | } | |
84 | ||
85 | static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset) | |
86 | { | |
87 | struct moxart_gpio_chip *gc = to_moxart_gpio(chip); | |
88 | u32 ret = readl(gc->moxart_gpio_base + GPIO_PIN_DIRECTION); | |
89 | ||
90 | if (ret & BIT(offset)) | |
91 | return !!(readl(gc->moxart_gpio_base + GPIO_DATA_OUT) & | |
92 | BIT(offset)); | |
93 | else | |
94 | return !!(readl(gc->moxart_gpio_base + GPIO_DATA_IN) & | |
95 | BIT(offset)); | |
96 | } | |
97 | ||
98 | static struct gpio_chip moxart_template_chip = { | |
99 | .label = "moxart-gpio", | |
100 | .request = moxart_gpio_request, | |
101 | .free = moxart_gpio_free, | |
102 | .direction_input = moxart_gpio_direction_input, | |
103 | .direction_output = moxart_gpio_direction_output, | |
104 | .set = moxart_gpio_set, | |
105 | .get = moxart_gpio_get, | |
106 | .base = 0, | |
107 | .ngpio = 32, | |
108 | .can_sleep = 0, | |
109 | }; | |
110 | ||
111 | static int moxart_gpio_probe(struct platform_device *pdev) | |
112 | { | |
113 | struct device *dev = &pdev->dev; | |
114 | struct resource *res; | |
115 | struct moxart_gpio_chip *mgc; | |
116 | int ret; | |
117 | ||
118 | mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL); | |
119 | if (!mgc) { | |
120 | dev_err(dev, "can't allocate GPIO chip container\n"); | |
121 | return -ENOMEM; | |
122 | } | |
123 | mgc->gpio = moxart_template_chip; | |
124 | ||
125 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
126 | mgc->moxart_gpio_base = devm_ioremap_resource(dev, res); | |
127 | if (IS_ERR(mgc->moxart_gpio_base)) { | |
128 | dev_err(dev, "%s: devm_ioremap_resource res_gpio failed\n", | |
129 | dev->of_node->full_name); | |
130 | return PTR_ERR(mgc->moxart_gpio_base); | |
131 | } | |
132 | ||
133 | mgc->gpio.dev = dev; | |
134 | ||
135 | ret = gpiochip_add(&mgc->gpio); | |
136 | if (ret) { | |
137 | dev_err(dev, "%s: gpiochip_add failed\n", | |
138 | dev->of_node->full_name); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static const struct of_device_id moxart_gpio_match[] = { | |
146 | { .compatible = "moxa,moxart-gpio" }, | |
147 | { } | |
148 | }; | |
149 | ||
150 | static struct platform_driver moxart_gpio_driver = { | |
151 | .driver = { | |
152 | .name = "moxart-gpio", | |
153 | .owner = THIS_MODULE, | |
154 | .of_match_table = moxart_gpio_match, | |
155 | }, | |
156 | .probe = moxart_gpio_probe, | |
157 | }; | |
158 | module_platform_driver(moxart_gpio_driver); | |
159 | ||
160 | MODULE_DESCRIPTION("MOXART GPIO chip driver"); | |
161 | MODULE_LICENSE("GPL"); | |
162 | MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); |