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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
* arch/arm/mach-mxc/generic.c
*
* author: Sascha Hauer
* Created: april 20th, 2004
* Copyright: Synertronixx GmbH
*
* Common code for i.MX machines
*
* 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 <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/gpio.h>
#include <asm/arch/hardware.h>
#include <asm/mach/map.h>
#include <asm/arch/iomux-mx1-mx2.h>
void mxc_gpio_mode(int gpio_mode)
{
unsigned int pin = gpio_mode & GPIO_PIN_MASK;
unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
unsigned int tmp;
/* Pullup enable */
tmp = __raw_readl(VA_GPIO_BASE + MXC_PUEN(port));
if (gpio_mode & GPIO_PUEN)
tmp |= (1 << pin);
else
tmp &= ~(1 << pin);
__raw_writel(tmp, VA_GPIO_BASE + MXC_PUEN(port));
/* Data direction */
tmp = __raw_readl(VA_GPIO_BASE + MXC_DDIR(port));
if (gpio_mode & GPIO_OUT)
tmp |= 1 << pin;
else
tmp &= ~(1 << pin);
__raw_writel(tmp, VA_GPIO_BASE + MXC_DDIR(port));
/* Primary / alternate function */
tmp = __raw_readl(VA_GPIO_BASE + MXC_GPR(port));
if (gpio_mode & GPIO_AF)
tmp |= (1 << pin);
else
tmp &= ~(1 << pin);
__raw_writel(tmp, VA_GPIO_BASE + MXC_GPR(port));
/* use as gpio? */
tmp = __raw_readl(VA_GPIO_BASE + MXC_GIUS(port));
if (gpio_mode & (GPIO_PF | GPIO_AF))
tmp &= ~(1 << pin);
else
tmp |= (1 << pin);
__raw_writel(tmp, VA_GPIO_BASE + MXC_GIUS(port));
if (pin < 16) {
tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR1(port));
tmp &= ~(3 << (pin * 2));
tmp |= (ocr << (pin * 2));
__raw_writel(tmp, VA_GPIO_BASE + MXC_OCR1(port));
tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA1(port));
tmp &= ~(3 << (pin * 2));
tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA1(port));
tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB1(port));
tmp &= ~(3 << (pin * 2));
tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB1(port));
} else {
pin -= 16;
tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR2(port));
tmp &= ~(3 << (pin * 2));
tmp |= (ocr << (pin * 2));
__raw_writel(tmp, VA_GPIO_BASE + MXC_OCR2(port));
tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA2(port));
tmp &= ~(3 << (pin * 2));
tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA2(port));
tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB2(port));
tmp &= ~(3 << (pin * 2));
tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB2(port));
}
}
EXPORT_SYMBOL(mxc_gpio_mode);
int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
int alloc_mode, const char *label)
{
const int *p = pin_list;
int i;
unsigned gpio;
unsigned mode;
for (i = 0; i < count; i++) {
gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
if (gpio >= (GPIO_PORT_MAX + 1) * 32)
goto setup_error;
if (alloc_mode & MXC_GPIO_ALLOC_MODE_RELEASE)
gpio_free(gpio);
else if (!(alloc_mode & MXC_GPIO_ALLOC_MODE_NO_ALLOC))
if (gpio_request(gpio, label)
&& !(alloc_mode & MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
goto setup_error;
if (!(alloc_mode & (MXC_GPIO_ALLOC_MODE_ALLOC_ONLY |
MXC_GPIO_ALLOC_MODE_RELEASE)))
mxc_gpio_mode(gpio | mode);
p++;
}
return 0;
setup_error:
if (alloc_mode & (MXC_GPIO_ALLOC_MODE_NO_ALLOC |
MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
return -EINVAL;
while (p != pin_list) {
p--;
gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
gpio_free(gpio);
}
return -EINVAL;
}
EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
|
