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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Basic GPIO helpers for Allwinner CPUs
*
* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
* Subject to the GNU GPL v2, or (at your option) any later version.
*/
#include "gpio.h"
#include <arch/io.h>
static struct a10_gpio *const gpio = (void *)GPIO_BASE;
/**
* \brief Set a single output pin
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @param[in] pin the pin number in the given port (1 -> 31)
*/
void gpio_set(u8 port, u8 pin)
{
u32 reg32;
if ((port > GPS))
return;
reg32 = gpio_read(port);
reg32 |= (1 << pin);
gpio_write(port, reg32);
}
/**
* \brief Clear a single output pin
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @param[in] pin the pin number in the given port (1 -> 31)
*/
void gpio_clear(u8 port, u8 pin)
{
u32 reg32;
if ((port > GPS))
return;
reg32 = gpio_read(port);
reg32 &= ~(1 << pin);
gpio_write(port, reg32);
}
/**
* \brief Get the status of a single input pin
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @param[in] pin the pin number in the given port (1 -> 31)
* @return 1 if the pin is high, or 0 if the pin is low
*/
int gpio_get(u8 port, u8 pin)
{
if ((port > GPS))
return 0;
return (gpio_read(port) & (1 << pin)) ? 1 : 0;
}
/**
* \brief Write to a GPIO port
*
* Write the state of all output pins in the GPIO port. This only affects pins
* configured as output pins.
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @param[in] value 32-bit mask indicating which pins to set. For a set bit, the
* corresponding pin will be set. Otherwise, it will be cleared
*/
void gpio_write(u8 port, u32 val)
{
if ((port > GPS))
return;
write32(val, &gpio->port[port].dat);
}
/**
* \brief Write to a GPIO port
*
* Read the state of all input pins in the GPIO port.
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @return 32-bit mask indicating which pins are high. For each set bit, the
* corresponding pin is high. The value of bits corresponding to pins
* which are not configured as inputs is undefined.
*/
u32 gpio_read(u8 port)
{
if ((port > GPS))
return 0;
return read32(&gpio->port[port].dat);
}
|
