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
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Combiner irqchip for EXYNOS
*
* 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/err.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irqdomain.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/mach/irq.h>
#include <plat/cpu.h>
#include "irqchip.h"
#define COMBINER_ENABLE_SET 0x0
#define COMBINER_ENABLE_CLEAR 0x4
#define COMBINER_INT_STATUS 0xC
#define IRQ_IN_COMBINER 8
static DEFINE_SPINLOCK(irq_controller_lock);
struct combiner_chip_data {
unsigned int irq_offset;
unsigned int irq_mask;
void __iomem *base;
unsigned int parent_irq;
};
static struct irq_domain *combiner_irq_domain;
static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
static inline void __iomem *combiner_base(struct irq_data *data)
{
struct combiner_chip_data *combiner_data =
irq_data_get_irq_chip_data(data);
return combiner_data->base;
}
static void combiner_mask_irq(struct irq_data *data)
{
u32 mask = 1 << (data->hwirq % 32);
__raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
}
static void combiner_unmask_irq(struct irq_data *data)
{
u32 mask = 1 << (data->hwirq % 32);
__raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
}
static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
{
struct combiner_chip_data *chip_data = irq_get_handler_data(irq);
struct irq_chip *chip = irq_get_chip(irq);
unsigned int cascade_irq, combiner_irq;
unsigned long status;
chained_irq_enter(chip, desc);
spin_lock(&irq_controller_lock);
status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
spin_unlock(&irq_controller_lock);
status &= chip_data->irq_mask;
if (status == 0)
goto out;
combiner_irq = __ffs(status);
cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
if (unlikely(cascade_irq >= NR_IRQS))
do_bad_IRQ(cascade_irq, desc);
else
generic_handle_irq(cascade_irq);
out:
chained_irq_exit(chip, desc);
}
#ifdef CONFIG_SMP
static int combiner_set_affinity(struct irq_data *d,
const struct cpumask *mask_val, bool force)
{
struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d);
struct irq_chip *chip = irq_get_chip(chip_data->parent_irq);
struct irq_data *data = irq_get_irq_data(chip_data->parent_irq);
if (chip && chip->irq_set_affinity)
return chip->irq_set_affinity(data, mask_val, force);
else
return -EINVAL;
}
#endif
static struct irq_chip combiner_chip = {
.name = "COMBINER",
.irq_mask = combiner_mask_irq,
.irq_unmask = combiner_unmask_irq,
#ifdef CONFIG_SMP
.irq_set_affinity = combiner_set_affinity,
#endif
};
static void __init combiner_cascade_irq(unsigned int combiner_nr,
unsigned int irq)
{
if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
BUG();
irq_set_chained_handler(irq, combiner_handle_cascade_irq);
}
static void __init combiner_init_one(unsigned int combiner_nr,
void __iomem *base, unsigned int irq)
{
combiner_data[combiner_nr].base = base;
combiner_data[combiner_nr].irq_offset = irq_find_mapping(
combiner_irq_domain, combiner_nr * IRQ_IN_COMBINER);
combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
combiner_data[combiner_nr].parent_irq = irq;
/* Disable all interrupts */
__raw_writel(combiner_data[combiner_nr].irq_mask,
base + COMBINER_ENABLE_CLEAR);
}
#ifdef CONFIG_OF
static int combiner_irq_domain_xlate(struct irq_domain *d,
struct device_node *controller,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
if (d->of_node != controller)
return -EINVAL;
if (intsize < 2)
return -EINVAL;
*out_hwirq = intspec[0] * IRQ_IN_COMBINER + intspec[1];
*out_type = 0;
return 0;
}
#else
static int combiner_irq_domain_xlate(struct irq_domain *d,
struct device_node *controller,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
return -EINVAL;
}
#endif
static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
irq_set_chip_data(irq, &combiner_data[hw >> 3]);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
return 0;
}
static struct irq_domain_ops combiner_irq_domain_ops = {
.xlate = combiner_irq_domain_xlate,
.map = combiner_irq_domain_map,
};
static unsigned int exynos4x12_combiner_extra_irq(int group)
{
switch (group) {
case 16:
return IRQ_SPI(107);
case 17:
return IRQ_SPI(108);
case 18:
return IRQ_SPI(48);
case 19:
return IRQ_SPI(42);
default:
return 0;
}
}
void __init combiner_init(void __iomem *combiner_base,
struct device_node *np,
unsigned int max_nr)
{
int i, irq, irq_base;
unsigned int nr_irq;
nr_irq = max_nr * IRQ_IN_COMBINER;
irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
if (IS_ERR_VALUE(irq_base)) {
irq_base = COMBINER_IRQ(0, 0);
pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base);
}
combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
&combiner_irq_domain_ops, &combiner_data);
if (WARN_ON(!combiner_irq_domain)) {
pr_warning("%s: irq domain init failed\n", __func__);
return;
}
for (i = 0; i < max_nr; i++) {
if (i < EXYNOS4210_MAX_COMBINER_NR || soc_is_exynos5250())
irq = IRQ_SPI(i);
else
irq = exynos4x12_combiner_extra_irq(i);
#ifdef CONFIG_OF
if (np)
irq = irq_of_parse_and_map(np, i);
#endif
combiner_init_one(i, combiner_base + (i >> 2) * 0x10, irq);
combiner_cascade_irq(i, irq);
}
}
#ifdef CONFIG_OF
static int __init combiner_of_init(struct device_node *np,
struct device_node *parent)
{
void __iomem *combiner_base;
unsigned int max_nr = 20;
combiner_base = of_iomap(np, 0);
if (!combiner_base) {
pr_err("%s: failed to map combiner registers\n", __func__);
return -ENXIO;
}
if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
pr_info("%s: number of combiners not specified, "
"setting default as %d.\n",
__func__, max_nr);
}
combiner_init(combiner_base, np, max_nr);
return 0;
}
IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner",
combiner_of_init);
#endif
|
