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
|
/*
* linux/arch/arm/mach-pxa/irq.c
*
* Generic PXA IRQ handling
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software Inc.
*
* 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/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/sysdev.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <mach/gpio.h>
#include <mach/regs-intc.h>
#include "generic.h"
#define IRQ_BIT(n) (((n) - PXA_IRQ(0)) & 0x1f)
#define _ICMR(n) (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICMR2 : &ICMR))
#define _ICLR(n) (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICLR2 : &ICLR))
/*
* This is for peripheral IRQs internal to the PXA chip.
*/
static int pxa_internal_irq_nr;
static void pxa_mask_irq(unsigned int irq)
{
_ICMR(irq) &= ~(1 << IRQ_BIT(irq));
}
static void pxa_unmask_irq(unsigned int irq)
{
_ICMR(irq) |= 1 << IRQ_BIT(irq);
}
static struct irq_chip pxa_internal_irq_chip = {
.name = "SC",
.ack = pxa_mask_irq,
.mask = pxa_mask_irq,
.unmask = pxa_unmask_irq,
};
/*
* GPIO IRQs for GPIO 0 and 1
*/
static int pxa_set_low_gpio_type(unsigned int irq, unsigned int type)
{
int gpio = irq - IRQ_GPIO0;
if (__gpio_is_occupied(gpio)) {
pr_err("%s failed: GPIO is configured\n", __func__);
return -EINVAL;
}
if (type & IRQ_TYPE_EDGE_RISING)
GRER0 |= GPIO_bit(gpio);
else
GRER0 &= ~GPIO_bit(gpio);
if (type & IRQ_TYPE_EDGE_FALLING)
GFER0 |= GPIO_bit(gpio);
else
GFER0 &= ~GPIO_bit(gpio);
return 0;
}
static void pxa_ack_low_gpio(unsigned int irq)
{
GEDR0 = (1 << (irq - IRQ_GPIO0));
}
static void pxa_mask_low_gpio(unsigned int irq)
{
ICMR &= ~(1 << (irq - PXA_IRQ(0)));
}
static void pxa_unmask_low_gpio(unsigned int irq)
{
ICMR |= 1 << (irq - PXA_IRQ(0));
}
static struct irq_chip pxa_low_gpio_chip = {
.name = "GPIO-l",
.ack = pxa_ack_low_gpio,
.mask = pxa_mask_low_gpio,
.unmask = pxa_unmask_low_gpio,
.set_type = pxa_set_low_gpio_type,
};
static void __init pxa_init_low_gpio_irq(set_wake_t fn)
{
int irq;
/* clear edge detection on GPIO 0 and 1 */
GFER0 &= ~0x3;
GRER0 &= ~0x3;
GEDR0 = 0x3;
for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
set_irq_chip(irq, &pxa_low_gpio_chip);
set_irq_handler(irq, handle_edge_irq);
set_irq_flags(irq, IRQF_VALID);
}
pxa_low_gpio_chip.set_wake = fn;
}
void __init pxa_init_irq(int irq_nr, set_wake_t fn)
{
int irq, i;
pxa_internal_irq_nr = irq_nr;
for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq += 32) {
_ICMR(irq) = 0; /* disable all IRQs */
_ICLR(irq) = 0; /* all IRQs are IRQ, not FIQ */
}
/* initialize interrupt priority */
if (cpu_is_pxa27x() || cpu_is_pxa3xx()) {
for (i = 0; i < irq_nr; i++)
IPR(i) = i | (1 << 31);
}
/* only unmasked interrupts kick us out of idle */
ICCR = 1;
for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) {
set_irq_chip(irq, &pxa_internal_irq_chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
pxa_internal_irq_chip.set_wake = fn;
pxa_init_low_gpio_irq(fn);
}
#ifdef CONFIG_PM
static unsigned long saved_icmr[2];
static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
{
int i, irq = PXA_IRQ(0);
for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
saved_icmr[i] = _ICMR(irq);
_ICMR(irq) = 0;
}
return 0;
}
static int pxa_irq_resume(struct sys_device *dev)
{
int i, irq = PXA_IRQ(0);
for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
_ICMR(irq) = saved_icmr[i];
_ICLR(irq) = 0;
}
ICCR = 1;
return 0;
}
#else
#define pxa_irq_suspend NULL
#define pxa_irq_resume NULL
#endif
struct sysdev_class pxa_irq_sysclass = {
.name = "irq",
.suspend = pxa_irq_suspend,
.resume = pxa_irq_resume,
};
static int __init pxa_irq_init(void)
{
return sysdev_class_register(&pxa_irq_sysclass);
}
core_initcall(pxa_irq_init);
|
