aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-msm/irq.c
blob: 0535b39261f07ca30160b19616d4c96874091454 (plain)
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
/* linux/arch/arm/mach-msm/irq.c
 *
 * Copyright (C) 2007 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/timer.h>

#include <linux/irq.h>
#include <asm/arch/hardware.h>

#include <asm/io.h>

#include <asm/arch/msm_iomap.h>

#define VIC_REG(off) (MSM_VIC_BASE + (off))

#define VIC_INT_SELECT0     VIC_REG(0x0000)  /* 1: FIQ, 0: IRQ */
#define VIC_INT_SELECT1     VIC_REG(0x0004)  /* 1: FIQ, 0: IRQ */
#define VIC_INT_EN0         VIC_REG(0x0010)
#define VIC_INT_EN1         VIC_REG(0x0014)
#define VIC_INT_ENCLEAR0    VIC_REG(0x0020)
#define VIC_INT_ENCLEAR1    VIC_REG(0x0024)
#define VIC_INT_ENSET0      VIC_REG(0x0030)
#define VIC_INT_ENSET1      VIC_REG(0x0034)
#define VIC_INT_TYPE0       VIC_REG(0x0040)  /* 1: EDGE, 0: LEVEL  */
#define VIC_INT_TYPE1       VIC_REG(0x0044)  /* 1: EDGE, 0: LEVEL  */
#define VIC_INT_POLARITY0   VIC_REG(0x0050)  /* 1: NEG, 0: POS */
#define VIC_INT_POLARITY1   VIC_REG(0x0054)  /* 1: NEG, 0: POS */
#define VIC_NO_PEND_VAL     VIC_REG(0x0060)
#define VIC_INT_MASTEREN    VIC_REG(0x0064)  /* 1: IRQ, 2: FIQ     */
#define VIC_PROTECTION      VIC_REG(0x006C)  /* 1: ENABLE          */
#define VIC_CONFIG          VIC_REG(0x0068)  /* 1: USE ARM1136 VIC */
#define VIC_IRQ_STATUS0     VIC_REG(0x0080)
#define VIC_IRQ_STATUS1     VIC_REG(0x0084)
#define VIC_FIQ_STATUS0     VIC_REG(0x0090)
#define VIC_FIQ_STATUS1     VIC_REG(0x0094)
#define VIC_RAW_STATUS0     VIC_REG(0x00A0)
#define VIC_RAW_STATUS1     VIC_REG(0x00A4)
#define VIC_INT_CLEAR0      VIC_REG(0x00B0)
#define VIC_INT_CLEAR1      VIC_REG(0x00B4)
#define VIC_SOFTINT0        VIC_REG(0x00C0)
#define VIC_SOFTINT1        VIC_REG(0x00C4)
#define VIC_IRQ_VEC_RD      VIC_REG(0x00D0)  /* pending int # */
#define VIC_IRQ_VEC_PEND_RD VIC_REG(0x00D4)  /* pending vector addr */
#define VIC_IRQ_VEC_WR      VIC_REG(0x00D8)
#define VIC_IRQ_IN_SERVICE  VIC_REG(0x00E0)
#define VIC_IRQ_IN_STACK    VIC_REG(0x00E4)
#define VIC_TEST_BUS_SEL    VIC_REG(0x00E8)

#define VIC_VECTPRIORITY(n) VIC_REG(0x0200+((n) * 4))
#define VIC_VECTADDR(n)     VIC_REG(0x0400+((n) * 4))

static void msm_irq_ack(unsigned int irq)
{
	unsigned reg = VIC_INT_CLEAR0 + ((irq & 32) ? 4 : 0);
	irq = 1 << (irq & 31);
	writel(irq, reg);
}

static void msm_irq_mask(unsigned int irq)
{
	unsigned reg = VIC_INT_ENCLEAR0 + ((irq & 32) ? 4 : 0);
	writel(1 << (irq & 31), reg);
}

static void msm_irq_unmask(unsigned int irq)
{
	unsigned reg = VIC_INT_ENSET0 + ((irq & 32) ? 4 : 0);
	writel(1 << (irq & 31), reg);
}

static int msm_irq_set_wake(unsigned int irq, unsigned int on)
{
	return -EINVAL;
}

static int msm_irq_set_type(unsigned int irq, unsigned int flow_type)
{
	unsigned treg = VIC_INT_TYPE0 + ((irq & 32) ? 4 : 0);
	unsigned preg = VIC_INT_POLARITY0 + ((irq & 32) ? 4 : 0);
	int b = 1 << (irq & 31);

	if (flow_type & (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW))
		writel(readl(preg) | b, preg);
	if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_HIGH))
		writel(readl(preg) & (~b), preg);

	if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
		writel(readl(treg) | b, treg);
		set_irq_handler(irq, handle_edge_irq);
	}
	if (flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) {
		writel(readl(treg) & (~b), treg);
		set_irq_handler(irq, handle_level_irq);
	}
	return 0;
}

static struct irq_chip msm_irq_chip = {
	.name      = "msm",
	.ack       = msm_irq_ack,
	.mask      = msm_irq_mask,
	.unmask    = msm_irq_unmask,
	.set_wake  = msm_irq_set_wake,
	.set_type  = msm_irq_set_type,
};

void __init msm_init_irq(void)
{
	unsigned n;

	/* select level interrupts */
	writel(0, VIC_INT_TYPE0);
	writel(0, VIC_INT_TYPE1);

	/* select highlevel interrupts */
	writel(0, VIC_INT_POLARITY0);
	writel(0, VIC_INT_POLARITY1);

	/* select IRQ for all INTs */
	writel(0, VIC_INT_SELECT0);
	writel(0, VIC_INT_SELECT1);

	/* disable all INTs */
	writel(0, VIC_INT_EN0);
	writel(0, VIC_INT_EN1);

	/* don't use 1136 vic */
	writel(0, VIC_CONFIG);

	/* enable interrupt controller */
	writel(1, VIC_INT_MASTEREN);

	for (n = 0; n < NR_MSM_IRQS; n++) {
		set_irq_chip(n, &msm_irq_chip);
		set_irq_handler(n, handle_level_irq);
		set_irq_flags(n, IRQF_VALID);
	}
}