Restore the gpio.h file, platform.c uses the generic GPIO API
[openwrt/staging/chunkeey.git] / target / linux / ar7-2.6 / files / include / asm-mips / ar7 / gpio.h
1 /*
2 * $Id: gpio.h 6693 2007-03-25 05:42:16Z ejka $
3 *
4 * Copyright (C) 2007 OpenWrt.org
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 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef __AR7_GPIO_H__
22 #define __AR7_GPIO_H__
23 #include <asm/ar7/ar7.h>
24
25 #define AR7_GPIO_MAX 32
26
27 extern int gpio_request(unsigned gpio, char *label);
28 extern void gpio_free(unsigned gpio);
29
30 /* Common GPIO layer */
31 static inline int gpio_direction_input(unsigned gpio)
32 {
33 void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
34
35 if (gpio >= AR7_GPIO_MAX)
36 return -EINVAL;
37
38 writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
39
40 return 0;
41 }
42
43 static inline int gpio_direction_output(unsigned gpio)
44 {
45 void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
46
47 if (gpio >= AR7_GPIO_MAX)
48 return -EINVAL;
49
50 writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
51
52 return 0;
53 }
54
55 static inline int gpio_get_value(unsigned gpio)
56 {
57 void __iomem *gpio_in = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
58
59 if (gpio >= AR7_GPIO_MAX)
60 return -EINVAL;
61
62 return ((readl(gpio_in) & (1 << gpio)) != 0);
63 }
64
65 static inline void gpio_set_value(unsigned gpio, int value)
66 {
67 void __iomem *gpio_out = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
68 volatile unsigned tmp;
69
70 if (gpio >= AR7_GPIO_MAX)
71 return;
72
73 tmp = readl(gpio_out) & ~(1 << gpio);
74 if (value)
75 tmp |= 1 << gpio;
76 writel(tmp, gpio_out);
77 }
78
79 static inline int gpio_to_irq(unsigned gpio)
80 {
81 return -EINVAL;
82 }
83
84 static inline int irq_to_gpio(unsigned irq)
85 {
86 return -EINVAL;
87 }
88
89 /* Board specific GPIO functions */
90 static inline int ar7_gpio_enable(unsigned gpio)
91 {
92 void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
93
94 if (gpio >= AR7_GPIO_MAX)
95 return -EINVAL;
96
97 writel(readl(gpio_en) | (1 << gpio), gpio_en);
98
99 return 0;
100 }
101
102 static inline int ar7_gpio_disable(unsigned gpio)
103 {
104 void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
105
106 if (gpio >= AR7_GPIO_MAX)
107 return -EINVAL;
108
109 writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
110
111 return 0;
112 }
113
114 #include <asm-generic/gpio.h>
115
116 #endif