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
|
/*
* Copyright (C) 2015 Dmitry Eremin-Solenikov
* Copyright (C) 1999-2001 Nicolas Pitre
*
* Generic IRQ handling for the SA11x0.
*
* 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/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/syscore_ops.h>
#include <linux/irqchip/irq-sa11x0.h>
#include <soc/sa1100/pwer.h>
#include <asm/exception.h>
#define ICIP 0x00 /* IC IRQ Pending reg. */
#define ICMR 0x04 /* IC Mask Reg. */
#define ICLR 0x08 /* IC Level Reg. */
#define ICCR 0x0C /* IC Control Reg. */
#define ICFP 0x10 /* IC FIQ Pending reg. */
#define ICPR 0x20 /* IC Pending Reg. */
static void __iomem *iobase;
/*
* We don't need to ACK IRQs on the SA1100 unless they're GPIOs
* this is for internal IRQs i.e. from IRQ LCD to RTCAlrm.
*/
static void sa1100_mask_irq(struct irq_data *d)
{
u32 reg;
reg = readl_relaxed(iobase + ICMR);
reg &= ~BIT(d->hwirq);
writel_relaxed(reg, iobase + ICMR);
}
static void sa1100_unmask_irq(struct irq_data *d)
{
u32 reg;
reg = readl_relaxed(iobase + ICMR);
reg |= BIT(d->hwirq);
writel_relaxed(reg, iobase + ICMR);
}
static int sa1100_set_wake(struct irq_data *d, unsigned int on)
{
return sa11x0_sc_set_wake(d->hwirq, on);
}
static struct irq_chip sa1100_normal_chip = {
.name = "SC",
.irq_ack = sa1100_mask_irq,
.irq_mask = sa1100_mask_irq,
.irq_unmask = sa1100_unmask_irq,
.irq_set_wake = sa1100_set_wake,
};
static int sa1100_normal_irqdomain_map(struct irq_domain *d,
unsigned int irq, irq_hw_number_t hwirq)
{
irq_set_chip_and_handler(irq, &sa1100_normal_chip,
handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
return 0;
}
static struct irq_domain_ops sa1100_normal_irqdomain_ops = {
.map = sa1100_normal_irqdomain_map,
.xlate = irq_domain_xlate_onetwocell,
};
static struct irq_domain *sa1100_normal_irqdomain;
static struct sa1100irq_state {
unsigned int saved;
unsigned int icmr;
unsigned int iclr;
unsigned int iccr;
} sa1100irq_state;
static int sa1100irq_suspend(void)
{
struct sa1100irq_state *st = &sa1100irq_state;
st->saved = 1;
st->icmr = readl_relaxed(iobase + ICMR);
st->iclr = readl_relaxed(iobase + ICLR);
st->iccr = readl_relaxed(iobase + ICCR);
/*
* Disable all GPIO-based interrupts.
*/
writel_relaxed(st->icmr & 0xfffff000, iobase + ICMR);
return 0;
}
static void sa1100irq_resume(void)
{
struct sa1100irq_state *st = &sa1100irq_state;
if (st->saved) {
writel_relaxed(st->iccr, iobase + ICCR);
writel_relaxed(st->iclr, iobase + ICLR);
writel_relaxed(st->icmr, iobase + ICMR);
}
}
static struct syscore_ops sa1100irq_syscore_ops = {
.suspend = sa1100irq_suspend,
.resume = sa1100irq_resume,
};
static int __init sa1100irq_init_devicefs(void)
{
register_syscore_ops(&sa1100irq_syscore_ops);
return 0;
}
device_initcall(sa1100irq_init_devicefs);
static asmlinkage void __exception_irq_entry
sa1100_handle_irq(struct pt_regs *regs)
{
uint32_t icip, icmr, mask;
do {
icip = readl_relaxed(iobase + ICIP);
icmr = readl_relaxed(iobase + ICMR);
mask = icip & icmr;
if (mask == 0)
break;
handle_domain_irq(sa1100_normal_irqdomain,
ffs(mask) - 1, regs);
} while (1);
}
void __init sa11x0_init_irq_nodt(int irq_start, resource_size_t io_start)
{
iobase = ioremap(io_start, SZ_64K);
if (WARN_ON(!iobase))
return;
/* disable all IRQs */
writel_relaxed(0, iobase + ICMR);
/* all IRQs are IRQ, not FIQ */
writel_relaxed(0, iobase + ICLR);
/*
* Whatever the doc says, this has to be set for the wait-on-irq
* instruction to work... on a SA1100 rev 9 at least.
*/
writel_relaxed(1, iobase + ICCR);
sa1100_normal_irqdomain = irq_domain_add_simple(NULL,
32, irq_start,
&sa1100_normal_irqdomain_ops, NULL);
set_handle_irq(sa1100_handle_irq);
}
|