[AR7] GPIO fix
[openwrt/svn-archive/archive.git] / target / linux / ar7 / files / include / asm-mips / ar7 / gpio.h
1 /*
2 * Copyright (C) 2007 OpenWrt.org
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #ifndef __AR7_GPIO_H__
20 #define __AR7_GPIO_H__
21 #include <asm/ar7/ar7.h>
22
23 #define AR7_GPIO_MAX 32
24
25 extern int gpio_request(unsigned gpio, const char *label);
26 extern void gpio_free(unsigned gpio);
27
28 /* Common GPIO layer */
29 static inline int gpio_get_value(unsigned gpio)
30 {
31 static unsigned addr;
32
33 if (!addr) {
34 void __iomem *gpio_in = (void __iomem *)
35 KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
36 addr = readl(gpio_in);
37 }
38
39 return addr & (1 << gpio);
40 }
41
42 static inline void gpio_set_value(unsigned gpio, int value)
43 {
44 static void __iomem *gpio_out;
45 unsigned tmp;
46
47 if (!gpio_out)
48 gpio_out = (void __iomem *)
49 KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
50
51 tmp = readl(gpio_out) & ~(1 << gpio);
52 if (value)
53 tmp |= 1 << gpio;
54 writel(tmp, gpio_out);
55 }
56
57 static inline int gpio_direction_input(unsigned gpio)
58 {
59 void __iomem *gpio_dir =
60 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
61
62 if (gpio >= AR7_GPIO_MAX)
63 return -EINVAL;
64
65 writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
66
67 return 0;
68 }
69
70 static inline int gpio_direction_output(unsigned gpio, int value)
71 {
72 void __iomem *gpio_dir =
73 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
74
75 if (gpio >= AR7_GPIO_MAX)
76 return -EINVAL;
77
78 gpio_set_value(gpio, value);
79 writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
80
81 return 0;
82 }
83
84 static inline int gpio_to_irq(unsigned gpio)
85 {
86 return -EINVAL;
87 }
88
89 static inline int irq_to_gpio(unsigned irq)
90 {
91 return -EINVAL;
92 }
93
94 /* Board specific GPIO functions */
95 static inline int ar7_gpio_enable(unsigned gpio)
96 {
97 void __iomem *gpio_en =
98 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
99
100 writel(readl(gpio_en) | (1 << gpio), gpio_en);
101
102 return 0;
103 }
104
105 static inline int ar7_gpio_disable(unsigned gpio)
106 {
107 void __iomem *gpio_en =
108 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
109
110 writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
111
112 return 0;
113 }
114
115 #include <asm-generic/gpio.h>
116
117 #endif