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a3b8d4a5 AS |
1 | /* |
2 | * CLPS711X GPIO driver | |
3 | * | |
4 | * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/io.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/platform_device.h> | |
18 | ||
19 | #include <mach/hardware.h> | |
20 | ||
21 | #define CLPS711X_GPIO_PORTS 5 | |
22 | #define CLPS711X_GPIO_NAME "gpio-clps711x" | |
23 | ||
24 | struct clps711x_gpio { | |
25 | struct gpio_chip chip[CLPS711X_GPIO_PORTS]; | |
26 | spinlock_t lock; | |
27 | }; | |
28 | ||
29 | static void __iomem *clps711x_ports[] = { | |
30 | CLPS711X_VIRT_BASE + PADR, | |
31 | CLPS711X_VIRT_BASE + PBDR, | |
32 | CLPS711X_VIRT_BASE + PCDR, | |
33 | CLPS711X_VIRT_BASE + PDDR, | |
34 | CLPS711X_VIRT_BASE + PEDR, | |
35 | }; | |
36 | ||
37 | static void __iomem *clps711x_pdirs[] = { | |
38 | CLPS711X_VIRT_BASE + PADDR, | |
39 | CLPS711X_VIRT_BASE + PBDDR, | |
40 | CLPS711X_VIRT_BASE + PCDDR, | |
41 | CLPS711X_VIRT_BASE + PDDDR, | |
42 | CLPS711X_VIRT_BASE + PEDDR, | |
43 | }; | |
44 | ||
45 | #define clps711x_port(x) clps711x_ports[x->base / 8] | |
46 | #define clps711x_pdir(x) clps711x_pdirs[x->base / 8] | |
47 | ||
48 | static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset) | |
49 | { | |
50 | return !!readb(clps711x_port(chip)) & (1 << offset); | |
51 | } | |
52 | ||
53 | static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset, | |
54 | int value) | |
55 | { | |
56 | int tmp; | |
57 | unsigned long flags; | |
58 | struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev); | |
59 | ||
60 | spin_lock_irqsave(&gpio->lock, flags); | |
61 | tmp = readb(clps711x_port(chip)) & ~(1 << offset); | |
62 | if (value) | |
63 | tmp |= 1 << offset; | |
64 | writeb(tmp, clps711x_port(chip)); | |
65 | spin_unlock_irqrestore(&gpio->lock, flags); | |
66 | } | |
67 | ||
68 | static int gpio_clps711x_direction_in(struct gpio_chip *chip, unsigned offset) | |
69 | { | |
70 | int tmp; | |
71 | unsigned long flags; | |
72 | struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev); | |
73 | ||
74 | spin_lock_irqsave(&gpio->lock, flags); | |
75 | tmp = readb(clps711x_pdir(chip)) & ~(1 << offset); | |
76 | writeb(tmp, clps711x_pdir(chip)); | |
77 | spin_unlock_irqrestore(&gpio->lock, flags); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static int gpio_clps711x_direction_out(struct gpio_chip *chip, unsigned offset, | |
83 | int value) | |
84 | { | |
85 | int tmp; | |
86 | unsigned long flags; | |
87 | struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev); | |
88 | ||
89 | spin_lock_irqsave(&gpio->lock, flags); | |
90 | tmp = readb(clps711x_pdir(chip)) | (1 << offset); | |
91 | writeb(tmp, clps711x_pdir(chip)); | |
92 | tmp = readb(clps711x_port(chip)) & ~(1 << offset); | |
93 | if (value) | |
94 | tmp |= 1 << offset; | |
95 | writeb(tmp, clps711x_port(chip)); | |
96 | spin_unlock_irqrestore(&gpio->lock, flags); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | struct clps711x_gpio_port { | |
102 | char *name; | |
103 | int nr; | |
104 | }; | |
105 | ||
106 | static const struct clps711x_gpio_port clps711x_gpio_ports[] __initconst = { | |
107 | { "PORTA", 8, }, | |
108 | { "PORTB", 8, }, | |
109 | { "PORTC", 8, }, | |
110 | { "PORTD", 8, }, | |
111 | { "PORTE", 3, }, | |
112 | }; | |
113 | ||
114 | static int __init gpio_clps711x_init(void) | |
115 | { | |
116 | int i; | |
117 | struct platform_device *pdev; | |
118 | struct clps711x_gpio *gpio; | |
119 | ||
120 | pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0); | |
121 | if (!pdev) { | |
122 | pr_err("Cannot create platform device: %s\n", | |
123 | CLPS711X_GPIO_NAME); | |
124 | return -ENOMEM; | |
125 | } | |
126 | ||
127 | platform_device_add(pdev); | |
128 | ||
129 | gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio), | |
130 | GFP_KERNEL); | |
131 | if (!gpio) { | |
132 | dev_err(&pdev->dev, "GPIO allocating memory error\n"); | |
133 | platform_device_del(pdev); | |
134 | platform_device_put(pdev); | |
135 | return -ENOMEM; | |
136 | } | |
137 | ||
138 | platform_set_drvdata(pdev, gpio); | |
139 | ||
140 | spin_lock_init(&gpio->lock); | |
141 | ||
142 | for (i = 0; i < CLPS711X_GPIO_PORTS; i++) { | |
143 | gpio->chip[i].owner = THIS_MODULE; | |
144 | gpio->chip[i].dev = &pdev->dev; | |
145 | gpio->chip[i].label = clps711x_gpio_ports[i].name; | |
146 | gpio->chip[i].base = i * 8; | |
147 | gpio->chip[i].ngpio = clps711x_gpio_ports[i].nr; | |
148 | gpio->chip[i].direction_input = gpio_clps711x_direction_in; | |
149 | gpio->chip[i].get = gpio_clps711x_get; | |
150 | gpio->chip[i].direction_output = gpio_clps711x_direction_out; | |
151 | gpio->chip[i].set = gpio_clps711x_set; | |
152 | WARN_ON(gpiochip_add(&gpio->chip[i])); | |
153 | } | |
154 | ||
155 | dev_info(&pdev->dev, "GPIO driver initialized\n"); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | arch_initcall(gpio_clps711x_init); | |
160 | ||
161 | MODULE_LICENSE("GPL v2"); | |
162 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); | |
163 | MODULE_DESCRIPTION("CLPS711X GPIO driver"); |