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
|
/*
* 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.
*
* Partially based on arch/mips/ralink/irq.c
*
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
* Copyright (C) 2014 Kevin Cernekee <cernekee@gmail.com>
*/
#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/bmips.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
/* INTC register offsets */
#define INTC_REG_ENABLE 0x00
#define INTC_REG_STATUS 0x04
#define MAX_WORDS 2
#define IRQS_PER_WORD 32
struct bcm3384_intc {
int n_words;
void __iomem *reg[MAX_WORDS];
u32 enable[MAX_WORDS];
spinlock_t lock;
};
static void bcm3384_intc_irq_unmask(struct irq_data *d)
{
struct bcm3384_intc *priv = d->domain->host_data;
unsigned long flags;
int idx = d->hwirq / IRQS_PER_WORD;
int bit = d->hwirq % IRQS_PER_WORD;
spin_lock_irqsave(&priv->lock, flags);
priv->enable[idx] |= BIT(bit);
__raw_writel(priv->enable[idx], priv->reg[idx] + INTC_REG_ENABLE);
spin_unlock_irqrestore(&priv->lock, flags);
}
static void bcm3384_intc_irq_mask(struct irq_data *d)
{
struct bcm3384_intc *priv = d->domain->host_data;
unsigned long flags;
int idx = d->hwirq / IRQS_PER_WORD;
int bit = d->hwirq % IRQS_PER_WORD;
spin_lock_irqsave(&priv->lock, flags);
priv->enable[idx] &= ~BIT(bit);
__raw_writel(priv->enable[idx], priv->reg[idx] + INTC_REG_ENABLE);
spin_unlock_irqrestore(&priv->lock, flags);
}
static struct irq_chip bcm3384_intc_irq_chip = {
.name = "INTC",
.irq_unmask = bcm3384_intc_irq_unmask,
.irq_mask = bcm3384_intc_irq_mask,
.irq_mask_ack = bcm3384_intc_irq_mask,
};
unsigned int get_c0_compare_int(void)
{
return CP0_LEGACY_COMPARE_IRQ;
}
static void bcm3384_intc_irq_handler(unsigned int irq, struct irq_desc *desc)
{
struct irq_domain *domain = irq_get_handler_data(irq);
struct bcm3384_intc *priv = domain->host_data;
unsigned long flags;
unsigned int idx;
for (idx = 0; idx < priv->n_words; idx++) {
unsigned long pending;
int hwirq;
spin_lock_irqsave(&priv->lock, flags);
pending = __raw_readl(priv->reg[idx] + INTC_REG_STATUS) &
priv->enable[idx];
spin_unlock_irqrestore(&priv->lock, flags);
for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
generic_handle_irq(irq_find_mapping(domain,
hwirq + idx * IRQS_PER_WORD));
}
}
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned long pending =
(read_c0_status() & read_c0_cause() & ST0_IM) >> STATUSB_IP0;
int bit;
for_each_set_bit(bit, &pending, 8)
do_IRQ(MIPS_CPU_IRQ_BASE + bit);
}
static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
{
irq_set_chip_and_handler(irq, &bcm3384_intc_irq_chip, handle_level_irq);
return 0;
}
static const struct irq_domain_ops irq_domain_ops = {
.xlate = irq_domain_xlate_onecell,
.map = intc_map,
};
static int __init ioremap_one_pair(struct bcm3384_intc *priv,
struct device_node *node,
int idx)
{
struct resource res;
if (of_address_to_resource(node, idx, &res))
return 0;
if (request_mem_region(res.start, resource_size(&res),
res.name) < 0)
pr_err("Failed to request INTC register region\n");
priv->reg[idx] = ioremap_nocache(res.start, resource_size(&res));
if (!priv->reg[idx])
panic("Failed to ioremap INTC register range");
/* start up with everything masked before we hook the parent IRQ */
__raw_writel(0, priv->reg[idx] + INTC_REG_ENABLE);
priv->enable[idx] = 0;
return IRQS_PER_WORD;
}
static int __init intc_of_init(struct device_node *node,
struct device_node *parent)
{
struct irq_domain *domain;
unsigned int parent_irq, n_irqs = 0;
struct bcm3384_intc *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
panic("Failed to allocate bcm3384_intc struct");
spin_lock_init(&priv->lock);
parent_irq = irq_of_parse_and_map(node, 0);
if (!parent_irq)
panic("Failed to get INTC IRQ");
n_irqs += ioremap_one_pair(priv, node, 0);
n_irqs += ioremap_one_pair(priv, node, 1);
if (!n_irqs)
panic("Failed to map INTC registers");
priv->n_words = n_irqs / IRQS_PER_WORD;
domain = irq_domain_add_linear(node, n_irqs, &irq_domain_ops, priv);
if (!domain)
panic("Failed to add irqdomain");
irq_set_chained_handler(parent_irq, bcm3384_intc_irq_handler);
irq_set_handler_data(parent_irq, domain);
return 0;
}
static struct of_device_id of_irq_ids[] __initdata = {
{ .compatible = "mti,cpu-interrupt-controller",
.data = mips_cpu_intc_init },
{ .compatible = "brcm,bcm3384-intc",
.data = intc_of_init },
{},
};
void __init arch_init_irq(void)
{
bmips_tp1_irqs = 0;
of_irq_init(of_irq_ids);
}
|
