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c52d3d68 | 1 | /* |
2 | * linux/arch/arm/mach-w90p910/gpio.c | |
3 | * | |
4 | * Generic w90p910 GPIO handling | |
5 | * | |
6 | * Wan ZongShun <mcuos.com@gmail.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/irq.h> | |
17 | #include <linux/debugfs.h> | |
18 | #include <linux/seq_file.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/gpio.h> | |
24 | ||
25 | #include <mach/hardware.h> | |
26 | ||
27 | #define GPIO_BASE (W90X900_VA_GPIO) | |
28 | #define GPIO_DIR (0x04) | |
29 | #define GPIO_OUT (0x08) | |
30 | #define GPIO_IN (0x0C) | |
31 | #define GROUPINERV (0x10) | |
32 | #define GPIO_GPIO(Nb) (0x00000001 << (Nb)) | |
33 | #define to_w90p910_gpio_chip(c) container_of(c, struct w90p910_gpio_chip, chip) | |
34 | ||
35 | #define W90P910_GPIO_CHIP(name, base_gpio, nr_gpio) \ | |
36 | { \ | |
37 | .chip = { \ | |
38 | .label = name, \ | |
39 | .direction_input = w90p910_dir_input, \ | |
40 | .direction_output = w90p910_dir_output, \ | |
41 | .get = w90p910_gpio_get, \ | |
42 | .set = w90p910_gpio_set, \ | |
43 | .base = base_gpio, \ | |
44 | .ngpio = nr_gpio, \ | |
45 | } \ | |
46 | } | |
47 | ||
48 | struct w90p910_gpio_chip { | |
49 | struct gpio_chip chip; | |
50 | void __iomem *regbase; /* Base of group register*/ | |
51 | spinlock_t gpio_lock; | |
52 | }; | |
53 | ||
54 | static int w90p910_gpio_get(struct gpio_chip *chip, unsigned offset) | |
55 | { | |
56 | struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip); | |
57 | void __iomem *pio = w90p910_gpio->regbase + GPIO_IN; | |
58 | unsigned int regval; | |
59 | ||
60 | regval = __raw_readl(pio); | |
61 | regval &= GPIO_GPIO(offset); | |
62 | ||
63 | return (regval != 0); | |
64 | } | |
65 | ||
66 | static void w90p910_gpio_set(struct gpio_chip *chip, unsigned offset, int val) | |
67 | { | |
68 | struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip); | |
69 | void __iomem *pio = w90p910_gpio->regbase + GPIO_OUT; | |
70 | unsigned int regval; | |
71 | unsigned long flags; | |
72 | ||
73 | spin_lock_irqsave(&w90p910_gpio->gpio_lock, flags); | |
74 | ||
75 | regval = __raw_readl(pio); | |
76 | ||
77 | if (val) | |
78 | regval |= GPIO_GPIO(offset); | |
79 | else | |
80 | regval &= ~GPIO_GPIO(offset); | |
81 | ||
82 | __raw_writel(regval, pio); | |
83 | ||
84 | spin_unlock_irqrestore(&w90p910_gpio->gpio_lock, flags); | |
85 | } | |
86 | ||
87 | static int w90p910_dir_input(struct gpio_chip *chip, unsigned offset) | |
88 | { | |
89 | struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip); | |
90 | void __iomem *pio = w90p910_gpio->regbase + GPIO_DIR; | |
91 | unsigned int regval; | |
92 | unsigned long flags; | |
93 | ||
94 | spin_lock_irqsave(&w90p910_gpio->gpio_lock, flags); | |
95 | ||
96 | regval = __raw_readl(pio); | |
97 | regval &= ~GPIO_GPIO(offset); | |
98 | __raw_writel(regval, pio); | |
99 | ||
100 | spin_unlock_irqrestore(&w90p910_gpio->gpio_lock, flags); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int w90p910_dir_output(struct gpio_chip *chip, unsigned offset, int val) | |
106 | { | |
107 | struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip); | |
108 | void __iomem *outreg = w90p910_gpio->regbase + GPIO_OUT; | |
109 | void __iomem *pio = w90p910_gpio->regbase + GPIO_DIR; | |
110 | unsigned int regval; | |
111 | unsigned long flags; | |
112 | ||
113 | spin_lock_irqsave(&w90p910_gpio->gpio_lock, flags); | |
114 | ||
115 | regval = __raw_readl(pio); | |
116 | regval |= GPIO_GPIO(offset); | |
117 | __raw_writel(regval, pio); | |
118 | ||
119 | regval = __raw_readl(outreg); | |
120 | ||
121 | if (val) | |
122 | regval |= GPIO_GPIO(offset); | |
123 | else | |
124 | regval &= ~GPIO_GPIO(offset); | |
125 | ||
126 | __raw_writel(regval, outreg); | |
127 | ||
128 | spin_unlock_irqrestore(&w90p910_gpio->gpio_lock, flags); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | static struct w90p910_gpio_chip w90p910_gpio[] = { | |
134 | W90P910_GPIO_CHIP("GROUPC", 0, 16), | |
135 | W90P910_GPIO_CHIP("GROUPD", 16, 10), | |
136 | W90P910_GPIO_CHIP("GROUPE", 26, 14), | |
137 | W90P910_GPIO_CHIP("GROUPF", 40, 10), | |
138 | W90P910_GPIO_CHIP("GROUPG", 50, 17), | |
139 | W90P910_GPIO_CHIP("GROUPH", 67, 8), | |
140 | W90P910_GPIO_CHIP("GROUPI", 75, 17), | |
141 | }; | |
142 | ||
143 | void __init w90p910_init_gpio(int nr_group) | |
144 | { | |
145 | unsigned i; | |
146 | struct w90p910_gpio_chip *gpio_chip; | |
147 | ||
148 | for (i = 0; i < nr_group; i++) { | |
149 | gpio_chip = &w90p910_gpio[i]; | |
150 | spin_lock_init(&gpio_chip->gpio_lock); | |
151 | gpio_chip->regbase = GPIO_BASE + i * GROUPINERV; | |
152 | gpiochip_add(&gpio_chip->chip); | |
153 | } | |
154 | } |