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
|
/*
* TI Common Platform Interrupt Controller (cp_intc) driver
*
* Author: Steve Chen <schen@mvista.com>
* Copyright (C) 2008-2009, MontaVista Software, Inc. <source@mvista.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/export.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <mach/common.h>
#include <mach/cp_intc.h>
static inline unsigned int cp_intc_read(unsigned offset)
{
return __raw_readl(davinci_intc_base + offset);
}
static inline void cp_intc_write(unsigned long value, unsigned offset)
{
__raw_writel(value, davinci_intc_base + offset);
}
static void cp_intc_ack_irq(struct irq_data *d)
{
cp_intc_write(d->hwirq, CP_INTC_SYS_STAT_IDX_CLR);
}
/* Disable interrupt */
static void cp_intc_mask_irq(struct irq_data *d)
{
/* XXX don't know why we need to disable nIRQ here... */
cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_CLR);
cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_CLR);
cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET);
}
/* Enable interrupt */
static void cp_intc_unmask_irq(struct irq_data *d)
{
cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_SET);
}
static int cp_intc_set_irq_type(struct irq_data *d, unsigned int flow_type)
{
unsigned reg = BIT_WORD(d->hwirq);
unsigned mask = BIT_MASK(d->hwirq);
unsigned polarity = cp_intc_read(CP_INTC_SYS_POLARITY(reg));
unsigned type = cp_intc_read(CP_INTC_SYS_TYPE(reg));
switch (flow_type) {
case IRQ_TYPE_EDGE_RISING:
polarity |= mask;
type |= mask;
break;
case IRQ_TYPE_EDGE_FALLING:
polarity &= ~mask;
type |= mask;
break;
case IRQ_TYPE_LEVEL_HIGH:
polarity |= mask;
type &= ~mask;
break;
case IRQ_TYPE_LEVEL_LOW:
polarity &= ~mask;
type &= ~mask;
break;
default:
return -EINVAL;
}
cp_intc_write(polarity, CP_INTC_SYS_POLARITY(reg));
cp_intc_write(type, CP_INTC_SYS_TYPE(reg));
return 0;
}
static struct irq_chip cp_intc_irq_chip = {
.name = "cp_intc",
.irq_ack = cp_intc_ack_irq,
.irq_mask = cp_intc_mask_irq,
.irq_unmask = cp_intc_unmask_irq,
.irq_set_type = cp_intc_set_irq_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static struct irq_domain *cp_intc_domain;
static int cp_intc_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
pr_debug("cp_intc_host_map(%d, 0x%lx)\n", virq, hw);
irq_set_chip(virq, &cp_intc_irq_chip);
irq_set_probe(virq);
irq_set_handler(virq, handle_edge_irq);
return 0;
}
static const struct irq_domain_ops cp_intc_host_ops = {
.map = cp_intc_host_map,
.xlate = irq_domain_xlate_onetwocell,
};
int __init cp_intc_of_init(struct device_node *node, struct device_node *parent)
{
u32 num_irq = davinci_soc_info.intc_irq_num;
u8 *irq_prio = davinci_soc_info.intc_irq_prios;
u32 *host_map = davinci_soc_info.intc_host_map;
unsigned num_reg = BITS_TO_LONGS(num_irq);
int i, irq_base;
davinci_intc_type = DAVINCI_INTC_TYPE_CP_INTC;
if (node) {
davinci_intc_base = of_iomap(node, 0);
if (of_property_read_u32(node, "ti,intc-size", &num_irq))
pr_warn("unable to get intc-size, default to %d\n",
num_irq);
} else {
davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_8K);
}
if (WARN_ON(!davinci_intc_base))
return -EINVAL;
cp_intc_write(0, CP_INTC_GLOBAL_ENABLE);
/* Disable all host interrupts */
cp_intc_write(0, CP_INTC_HOST_ENABLE(0));
/* Disable system interrupts */
for (i = 0; i < num_reg; i++)
cp_intc_write(~0, CP_INTC_SYS_ENABLE_CLR(i));
/* Set to normal mode, no nesting, no priority hold */
cp_intc_write(0, CP_INTC_CTRL);
cp_intc_write(0, CP_INTC_HOST_CTRL);
/* Clear system interrupt status */
for (i = 0; i < num_reg; i++)
cp_intc_write(~0, CP_INTC_SYS_STAT_CLR(i));
/* Enable nIRQ (what about nFIQ?) */
cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET);
/*
* Priority is determined by host channel: lower channel number has
* higher priority i.e. channel 0 has highest priority and channel 31
* had the lowest priority.
*/
num_reg = (num_irq + 3) >> 2; /* 4 channels per register */
if (irq_prio) {
unsigned j, k;
u32 val;
for (k = i = 0; i < num_reg; i++) {
for (val = j = 0; j < 4; j++, k++) {
val >>= 8;
if (k < num_irq)
val |= irq_prio[k] << 24;
}
cp_intc_write(val, CP_INTC_CHAN_MAP(i));
}
} else {
/*
* Default everything to channel 15 if priority not specified.
* Note that channel 0-1 are mapped to nFIQ and channels 2-31
* are mapped to nIRQ.
*/
for (i = 0; i < num_reg; i++)
cp_intc_write(0x0f0f0f0f, CP_INTC_CHAN_MAP(i));
}
if (host_map)
for (i = 0; host_map[i] != -1; i++)
cp_intc_write(host_map[i], CP_INTC_HOST_MAP(i));
irq_base = irq_alloc_descs(-1, 0, num_irq, 0);
if (irq_base < 0) {
pr_warn("Couldn't allocate IRQ numbers\n");
irq_base = 0;
}
/* create a legacy host */
cp_intc_domain = irq_domain_add_legacy(node, num_irq,
irq_base, 0, &cp_intc_host_ops, NULL);
if (!cp_intc_domain) {
pr_err("cp_intc: failed to allocate irq host!\n");
return -EINVAL;
}
/* Enable global interrupt */
cp_intc_write(1, CP_INTC_GLOBAL_ENABLE);
return 0;
}
void __init cp_intc_init(void)
{
cp_intc_of_init(NULL, NULL);
}
|
