1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/*
* OpenRISC gpio driver
*
* Copyright (C) 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
*
* based on nios2 gpio driver
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
*
* when CONFIG_SYS_GPIO_BASE is not defined, board may provide
* its own driver.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifdef CONFIG_SYS_GPIO_BASE
#include <asm/io.h>
static inline int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
static inline int gpio_free(unsigned gpio)
{
return 0;
}
static inline int gpio_get_value(unsigned gpio)
{
return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1;
}
static inline void gpio_set_value(unsigned gpio, int value)
{
u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8);
if (value)
tmp |= (1 << gpio%8);
else
tmp &= ~(1 << gpio%8);
writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8);
}
static inline int gpio_direction_input(unsigned gpio)
{
gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0);
return 0;
}
static inline int gpio_direction_output(unsigned gpio, int value)
{
gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1);
gpio_set_value(gpio, value);
return 0;
}
static inline int gpio_is_valid(int number)
{
return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH;
}
#else
extern int gpio_request(unsigned gpio, const char *label);
extern int gpio_free(unsigned gpio);
extern int gpio_direction_input(unsigned gpio);
extern int gpio_direction_output(unsigned gpio, int value);
extern int gpio_get_value(unsigned gpio);
extern void gpio_set_value(unsigned gpio, int value);
extern int gpio_is_valid(int number);
#endif /* CONFIG_SYS_GPIO_BASE */
|
