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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* (c) Copyright 2009 Freescale Semiconductors
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
#include <common.h>
#include <asm/arch/mx25.h>
#include <asm/arch/mx25_pins.h>
#include <asm/arch/gpio.h>
enum gpio_reg {
DR = 0x00,
GDIR = 0x04,
PSR = 0x08,
ICR1 = 0x0C,
ICR2 = 0x10,
IMR = 0x14,
ISR = 0x18,
};
struct gpio_port_addr {
int num;
int base;
};
struct gpio_port_addr gpio_port[4] = {
{0, GPIO1_BASE},
{1, GPIO2_BASE},
{2, GPIO3_BASE},
{3, GPIO4_BASE}
};
/*
* Set a GPIO pin's direction
* @param port pointer to a gpio_port
* @param index gpio pin index value (0~31)
* @param is_input 0 for output; non-zero for input
*/
static void _set_gpio_direction(u32 port, u32 index, int is_input)
{
u32 reg = gpio_port[port].base + GDIR;
u32 l;
l = __REG(reg);
if (is_input)
l &= ~(1 << index);
else
l |= 1 << index;
__REG(reg) = l;
}
/*!
* Exported function to set a GPIO pin's direction
* @param pin a name defined by \b iomux_pin_name_t
* @param is_input 1 (or non-zero) for input; 0 for output
*/
void mxc_set_gpio_direction(iomux_pin_name_t pin, int is_input)
{
u32 port;
u32 gpio = IOMUX_TO_GPIO(pin);
port = GPIO_TO_PORT(gpio);
_set_gpio_direction(port, GPIO_TO_INDEX(gpio), is_input);
}
/*
* Set a GPIO pin's data output
* @param port number of gpio port
* @param index gpio pin index value (0~31)
* @param data value to be set (only 0 or 1 is valid)
*/
static void _set_gpio_dataout(u32 port, u32 index, u32 data)
{
u32 reg = gpio_port[port].base + DR;
u32 l = 0;
l = (__REG(reg) & (~(1 << index))) | (data << index);
__REG(reg) = l;
}
/*!
* Exported function to set a GPIO pin's data output
* @param pin a name defined by \b iomux_pin_name_t
* @param data value to be set (only 0 or 1 is valid)
*/
void mxc_set_gpio_dataout(iomux_pin_name_t pin, u32 data)
{
u32 port;
u32 gpio = IOMUX_TO_GPIO(pin);
port = GPIO_TO_PORT(gpio);
_set_gpio_dataout(port, GPIO_TO_INDEX(gpio), (data == 0) ? 0 : 1);
}
|
