[xbrust] Fix gpio and irq wakeup irq handling.
[openwrt/svn-archive/archive.git] / target / linux / xburst / files-2.6.32 / arch / mips / jz4740 / irq.c
1 /*
2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 platform IRQ support
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16 #include <linux/errno.h>
17 #include <linux/init.h>
18 #include <linux/types.h>
19 #include <linux/interrupt.h>
20 #include <linux/ioport.h>
21 #include <linux/timex.h>
22 #include <linux/slab.h>
23 #include <linux/delay.h>
24
25 #include <linux/debugfs.h>
26 #include <linux/seq_file.h>
27
28 #include <asm/io.h>
29 #include <asm/mipsregs.h>
30 #include <asm/irq_cpu.h>
31
32 static void __iomem *jz_intc_base;
33 static uint32_t jz_intc_wakeup;
34 static uint32_t jz_intc_saved;
35
36 #define JZ_REG_BASE_INTC 0x10001000
37
38 #define JZ_REG_INTC_STATUS 0x00
39 #define JZ_REG_INTC_MASK 0x04
40 #define JZ_REG_INTC_SET_MASK 0x08
41 #define JZ_REG_INTC_CLEAR_MASK 0x0c
42 #define JZ_REG_INTC_PENDING 0x10
43
44 #define IRQ_BIT(x) BIT((x) - JZ_IRQ_BASE)
45
46 static void intc_irq_unmask(unsigned int irq)
47 {
48 writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_CLEAR_MASK);
49 }
50
51 static void intc_irq_mask(unsigned int irq)
52 {
53 writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_SET_MASK);
54 }
55
56 static void intc_irq_ack(unsigned int irq)
57 {
58 writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_PENDING);
59 }
60
61 static int intc_irq_set_wake(unsigned int irq, unsigned int on)
62 {
63 if (on)
64 jz_intc_wakeup |= IRQ_BIT(irq);
65 else
66 jz_intc_wakeup &= ~IRQ_BIT(irq);
67
68 return 0;
69 }
70
71 static struct irq_chip intc_irq_type = {
72 .name = "INTC",
73 .mask = intc_irq_mask,
74 .unmask = intc_irq_unmask,
75 .ack = intc_irq_ack,
76 .set_wake = intc_irq_set_wake,
77 };
78
79 static irqreturn_t jz4740_cascade(int irq, void *data)
80 {
81 uint32_t irq_reg;
82
83 irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING);
84 generic_handle_irq(ffs(irq_reg) - 1 + JZ_IRQ_BASE);
85
86 return IRQ_HANDLED;
87 }
88
89 static struct irqaction jz4740_cascade_action = {
90 .handler = jz4740_cascade,
91 .name = "JZ4740 cascade interrupt"
92 };
93
94 void __init arch_init_irq(void)
95 {
96 int i;
97 mips_cpu_irq_init();
98
99 jz_intc_base = ioremap(JZ_REG_BASE_INTC, 0x14);
100
101 for (i = JZ_IRQ_BASE; i < JZ_IRQ_BASE + 32; i++) {
102 intc_irq_mask(i);
103 set_irq_chip_and_handler(i, &intc_irq_type, handle_level_irq);
104 }
105
106 setup_irq(2, &jz4740_cascade_action);
107 }
108
109 asmlinkage void plat_irq_dispatch(void)
110 {
111 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
112 if (pending & STATUSF_IP2)
113 jz4740_cascade(2, NULL);
114 else if(pending & STATUSF_IP3)
115 do_IRQ(3);
116 else
117 spurious_interrupt();
118 }
119
120 /* TODO: Use sysdev */
121 void jz4740_intc_suspend(void)
122 {
123 jz_intc_saved = readl(jz_intc_base + JZ_REG_INTC_MASK);
124 writel(~jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_SET_MASK);
125 writel(jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_CLEAR_MASK);
126 }
127
128 void jz4740_intc_resume(void)
129 {
130 writel(~jz_intc_saved, jz_intc_base + JZ_REG_INTC_CLEAR_MASK);
131 writel(jz_intc_saved, jz_intc_base + JZ_REG_INTC_SET_MASK);
132 }
133
134 #ifdef CONFIG_DEBUG_FS
135
136 static int intc_regs_show(struct seq_file *s, void *unused)
137 {
138 seq_printf(s, "Status:\t\t%08x\n", readl(jz_intc_base + JZ_REG_INTC_STATUS));
139 seq_printf(s, "Mask\t\t%08x\n", readl(jz_intc_base + JZ_REG_INTC_MASK));
140 seq_printf(s, "Pending:\t%08x\n", readl(jz_intc_base + JZ_REG_INTC_PENDING));
141
142 return 0;
143 }
144
145 static int intc_regs_open(struct inode *inode, struct file *file)
146 {
147 return single_open(file, intc_regs_show, NULL);
148 }
149
150 static const struct file_operations intc_regs_operations = {
151 .open = intc_regs_open,
152 .read = seq_read,
153 .llseek = seq_lseek,
154 .release = single_release,
155 };
156
157 static int __init intc_debugfs_init(void)
158 {
159 (void) debugfs_create_file("jz_regs_intc", S_IFREG | S_IRUGO,
160 NULL, NULL, &intc_regs_operations);
161 return 0;
162 }
163 subsys_initcall(intc_debugfs_init);
164
165 #endif