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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* arch/arm/mach-orion/gpio.c
*
* GPIO functions for Marvell Orion System On Chip
*
* Maintainer: Tzachi Perelstein <tzachi@marvell.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/orion.h>
#include "common.h"
static DEFINE_SPINLOCK(gpio_lock);
static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)];
static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */
void __init orion_gpio_set_valid_pins(u32 pins)
{
gpio_valid[0] = pins;
}
/*
* GENERIC_GPIO primitives
*/
int gpio_direction_input(unsigned pin)
{
unsigned long flags;
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return -EINVAL;
}
spin_lock_irqsave(&gpio_lock, flags);
/*
* Some callers might have not used the gpio_request(),
* so flag this pin as requested now.
*/
if (!gpio_label[pin])
gpio_label[pin] = "?";
orion_setbits(GPIO_IO_CONF, 1 << pin);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_input);
int gpio_direction_output(unsigned pin, int value)
{
unsigned long flags;
int mask;
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return -EINVAL;
}
spin_lock_irqsave(&gpio_lock, flags);
/*
* Some callers might have not used the gpio_request(),
* so flag this pin as requested now.
*/
if (!gpio_label[pin])
gpio_label[pin] = "?";
mask = 1 << pin;
orion_clrbits(GPIO_BLINK_EN, mask);
if (value)
orion_setbits(GPIO_OUT, mask);
else
orion_clrbits(GPIO_OUT, mask);
orion_clrbits(GPIO_IO_CONF, mask);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_output);
int gpio_get_value(unsigned pin)
{
int val, mask = 1 << pin;
if (orion_read(GPIO_IO_CONF) & mask)
val = orion_read(GPIO_DATA_IN) ^ orion_read(GPIO_IN_POL);
else
val = orion_read(GPIO_OUT);
return val & mask;
}
EXPORT_SYMBOL(gpio_get_value);
void gpio_set_value(unsigned pin, int value)
{
unsigned long flags;
int mask = 1 << pin;
spin_lock_irqsave(&gpio_lock, flags);
orion_clrbits(GPIO_BLINK_EN, mask);
if (value)
orion_setbits(GPIO_OUT, mask);
else
orion_clrbits(GPIO_OUT, mask);
spin_unlock_irqrestore(&gpio_lock, flags);
}
EXPORT_SYMBOL(gpio_set_value);
void orion_gpio_set_blink(unsigned pin, int blink)
{
unsigned long flags;
int mask = 1 << pin;
spin_lock_irqsave(&gpio_lock, flags);
orion_clrbits(GPIO_OUT, mask);
if (blink)
orion_setbits(GPIO_BLINK_EN, mask);
else
orion_clrbits(GPIO_BLINK_EN, mask);
spin_unlock_irqrestore(&gpio_lock, flags);
}
EXPORT_SYMBOL(orion_gpio_set_blink);
int gpio_request(unsigned pin, const char *label)
{
int ret = 0;
unsigned long flags;
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return -EINVAL;
}
spin_lock_irqsave(&gpio_lock, flags);
if (gpio_label[pin]) {
pr_debug("%s: GPIO %d already used as %s\n",
__func__, pin, gpio_label[pin]);
ret = -EBUSY;
} else
gpio_label[pin] = label ? label : "?";
spin_unlock_irqrestore(&gpio_lock, flags);
return ret;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned pin)
{
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return;
}
if (!gpio_label[pin])
pr_warning("%s: GPIO %d already freed\n", __func__, pin);
else
gpio_label[pin] = NULL;
}
EXPORT_SYMBOL(gpio_free);
/* Debug helper */
void gpio_display(void)
{
int i;
for (i = 0; i < GPIO_MAX; i++) {
printk(KERN_DEBUG "Pin-%d: ", i);
if (!test_bit(i, gpio_valid)) {
printk("non-GPIO\n");
} else if (!gpio_label[i]) {
printk("GPIO, free\n");
} else {
printk("GPIO, used by %s, ", gpio_label[i]);
if (orion_read(GPIO_IO_CONF) & (1 << i)) {
printk("input, active %s, level %s, edge %s\n",
((orion_read(GPIO_IN_POL) >> i) & 1) ? "low" : "high",
((orion_read(GPIO_LEVEL_MASK) >> i) & 1) ? "enabled" : "masked",
((orion_read(GPIO_EDGE_MASK) >> i) & 1) ? "enabled" : "masked");
} else {
printk("output, val=%d\n", (orion_read(GPIO_OUT) >> i) & 1);
}
}
}
printk(KERN_DEBUG "MPP_0_7_CTRL (0x%08x) = 0x%08x\n",
MPP_0_7_CTRL, orion_read(MPP_0_7_CTRL));
printk(KERN_DEBUG "MPP_8_15_CTRL (0x%08x) = 0x%08x\n",
MPP_8_15_CTRL, orion_read(MPP_8_15_CTRL));
printk(KERN_DEBUG "MPP_16_19_CTRL (0x%08x) = 0x%08x\n",
MPP_16_19_CTRL, orion_read(MPP_16_19_CTRL));
printk(KERN_DEBUG "MPP_DEV_CTRL (0x%08x) = 0x%08x\n",
MPP_DEV_CTRL, orion_read(MPP_DEV_CTRL));
printk(KERN_DEBUG "GPIO_OUT (0x%08x) = 0x%08x\n",
GPIO_OUT, orion_read(GPIO_OUT));
printk(KERN_DEBUG "GPIO_IO_CONF (0x%08x) = 0x%08x\n",
GPIO_IO_CONF, orion_read(GPIO_IO_CONF));
printk(KERN_DEBUG "GPIO_BLINK_EN (0x%08x) = 0x%08x\n",
GPIO_BLINK_EN, orion_read(GPIO_BLINK_EN));
printk(KERN_DEBUG "GPIO_IN_POL (0x%08x) = 0x%08x\n",
GPIO_IN_POL, orion_read(GPIO_IN_POL));
printk(KERN_DEBUG "GPIO_DATA_IN (0x%08x) = 0x%08x\n",
GPIO_DATA_IN, orion_read(GPIO_DATA_IN));
printk(KERN_DEBUG "GPIO_LEVEL_MASK (0x%08x) = 0x%08x\n",
GPIO_LEVEL_MASK, orion_read(GPIO_LEVEL_MASK));
printk(KERN_DEBUG "GPIO_EDGE_CAUSE (0x%08x) = 0x%08x\n",
GPIO_EDGE_CAUSE, orion_read(GPIO_EDGE_CAUSE));
printk(KERN_DEBUG "GPIO_EDGE_MASK (0x%08x) = 0x%08x\n",
GPIO_EDGE_MASK, orion_read(GPIO_EDGE_MASK));
}
|
