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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/*
* Atheros AR71XX/AR724X/AR913X GPIO API support
*
* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/gpio.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include <asm/mach-ath79/ath79.h>
#include "common.h"
static void __iomem *ath79_gpio_base;
static unsigned long ath79_gpio_count;
static DEFINE_SPINLOCK(ath79_gpio_lock);
static void __ath79_gpio_set_value(unsigned gpio, int value)
{
void __iomem *base = ath79_gpio_base;
if (value)
__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET);
else
__raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR);
}
static int __ath79_gpio_get_value(unsigned gpio)
{
return (__raw_readl(ath79_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1;
}
static int ath79_gpio_get_value(struct gpio_chip *chip, unsigned offset)
{
return __ath79_gpio_get_value(offset);
}
static void ath79_gpio_set_value(struct gpio_chip *chip,
unsigned offset, int value)
{
__ath79_gpio_set_value(offset, value);
}
static int ath79_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
return 0;
}
static int ath79_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
if (value)
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
else
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
return 0;
}
static int ar934x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
return 0;
}
static int ar934x_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
if (value)
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
else
__raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
base + AR71XX_GPIO_REG_OE);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
return 0;
}
static struct gpio_chip ath79_gpio_chip = {
.label = "ath79",
.get = ath79_gpio_get_value,
.set = ath79_gpio_set_value,
.direction_input = ath79_gpio_direction_input,
.direction_output = ath79_gpio_direction_output,
.base = 0,
};
void ath79_gpio_function_enable(u32 mask)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) | mask,
base + AR71XX_GPIO_REG_FUNC);
/* flush write */
__raw_readl(base + AR71XX_GPIO_REG_FUNC);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
}
void ath79_gpio_function_disable(u32 mask)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
__raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~mask,
base + AR71XX_GPIO_REG_FUNC);
/* flush write */
__raw_readl(base + AR71XX_GPIO_REG_FUNC);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
}
void ath79_gpio_function_setup(u32 set, u32 clear)
{
void __iomem *base = ath79_gpio_base;
unsigned long flags;
spin_lock_irqsave(&ath79_gpio_lock, flags);
__raw_writel((__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~clear) | set,
base + AR71XX_GPIO_REG_FUNC);
/* flush write */
__raw_readl(base + AR71XX_GPIO_REG_FUNC);
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
}
void __init ath79_gpio_init(void)
{
int err;
if (soc_is_ar71xx())
ath79_gpio_count = AR71XX_GPIO_COUNT;
else if (soc_is_ar724x())
ath79_gpio_count = AR724X_GPIO_COUNT;
else if (soc_is_ar913x())
ath79_gpio_count = AR913X_GPIO_COUNT;
else if (soc_is_ar933x())
ath79_gpio_count = AR933X_GPIO_COUNT;
else if (soc_is_ar934x())
ath79_gpio_count = AR934X_GPIO_COUNT;
else
BUG();
ath79_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
ath79_gpio_chip.ngpio = ath79_gpio_count;
if (soc_is_ar934x()) {
ath79_gpio_chip.direction_input = ar934x_gpio_direction_input;
ath79_gpio_chip.direction_output = ar934x_gpio_direction_output;
}
err = gpiochip_add(&ath79_gpio_chip);
if (err)
panic("cannot add AR71xx GPIO chip, error=%d", err);
}
int gpio_get_value(unsigned gpio)
{
if (gpio < ath79_gpio_count)
return __ath79_gpio_get_value(gpio);
return __gpio_get_value(gpio);
}
EXPORT_SYMBOL(gpio_get_value);
void gpio_set_value(unsigned gpio, int value)
{
if (gpio < ath79_gpio_count)
__ath79_gpio_set_value(gpio, value);
else
__gpio_set_value(gpio, value);
}
EXPORT_SYMBOL(gpio_set_value);
int gpio_to_irq(unsigned gpio)
{
/* FIXME */
return -EINVAL;
}
EXPORT_SYMBOL(gpio_to_irq);
int irq_to_gpio(unsigned irq)
{
/* FIXME */
return -EINVAL;
}
EXPORT_SYMBOL(irq_to_gpio);
|
