diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2010-07-17 07:08:43 -0400 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2010-08-05 08:26:13 -0400 |
commit | 9869848d12601cdddf097a36aebe0b10dc5d177b (patch) | |
tree | 1c55b11877e01eb8113e780e5ebb3ac888a0b8b3 /arch/mips | |
parent | 570a0bb82f0b5c2c6324153010e72c3f0c26a7a3 (diff) |
MIPS: JZ4740: Add IRQ handler code
Add support for IRQ handling on a JZ4740 SoC.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1465/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r-- | arch/mips/include/asm/mach-jz4740/irq.h | 57 | ||||
-rw-r--r-- | arch/mips/jz4740/irq.c | 167 | ||||
-rw-r--r-- | arch/mips/jz4740/irq.h | 21 |
3 files changed, 245 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-jz4740/irq.h b/arch/mips/include/asm/mach-jz4740/irq.h new file mode 100644 index 000000000000..a865c983c70a --- /dev/null +++ b/arch/mips/include/asm/mach-jz4740/irq.h | |||
@@ -0,0 +1,57 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> | ||
3 | * JZ4740 IRQ definitions | ||
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 | #ifndef __ASM_MACH_JZ4740_IRQ_H__ | ||
17 | #define __ASM_MACH_JZ4740_IRQ_H__ | ||
18 | |||
19 | #define MIPS_CPU_IRQ_BASE 0 | ||
20 | #define JZ4740_IRQ_BASE 8 | ||
21 | |||
22 | /* 1st-level interrupts */ | ||
23 | #define JZ4740_IRQ(x) (JZ4740_IRQ_BASE + (x)) | ||
24 | #define JZ4740_IRQ_I2C JZ4740_IRQ(1) | ||
25 | #define JZ4740_IRQ_UHC JZ4740_IRQ(3) | ||
26 | #define JZ4740_IRQ_UART1 JZ4740_IRQ(8) | ||
27 | #define JZ4740_IRQ_UART0 JZ4740_IRQ(9) | ||
28 | #define JZ4740_IRQ_SADC JZ4740_IRQ(12) | ||
29 | #define JZ4740_IRQ_MSC JZ4740_IRQ(14) | ||
30 | #define JZ4740_IRQ_RTC JZ4740_IRQ(15) | ||
31 | #define JZ4740_IRQ_SSI JZ4740_IRQ(16) | ||
32 | #define JZ4740_IRQ_CIM JZ4740_IRQ(17) | ||
33 | #define JZ4740_IRQ_AIC JZ4740_IRQ(18) | ||
34 | #define JZ4740_IRQ_ETH JZ4740_IRQ(19) | ||
35 | #define JZ4740_IRQ_DMAC JZ4740_IRQ(20) | ||
36 | #define JZ4740_IRQ_TCU2 JZ4740_IRQ(21) | ||
37 | #define JZ4740_IRQ_TCU1 JZ4740_IRQ(22) | ||
38 | #define JZ4740_IRQ_TCU0 JZ4740_IRQ(23) | ||
39 | #define JZ4740_IRQ_UDC JZ4740_IRQ(24) | ||
40 | #define JZ4740_IRQ_GPIO3 JZ4740_IRQ(25) | ||
41 | #define JZ4740_IRQ_GPIO2 JZ4740_IRQ(26) | ||
42 | #define JZ4740_IRQ_GPIO1 JZ4740_IRQ(27) | ||
43 | #define JZ4740_IRQ_GPIO0 JZ4740_IRQ(28) | ||
44 | #define JZ4740_IRQ_IPU JZ4740_IRQ(29) | ||
45 | #define JZ4740_IRQ_LCD JZ4740_IRQ(30) | ||
46 | |||
47 | /* 2nd-level interrupts */ | ||
48 | #define JZ4740_IRQ_DMA(x) (JZ4740_IRQ(32) + (X)) | ||
49 | |||
50 | #define JZ4740_IRQ_INTC_GPIO(x) (JZ4740_IRQ_GPIO0 - (x)) | ||
51 | #define JZ4740_IRQ_GPIO(x) (JZ4740_IRQ(48) + (x)) | ||
52 | |||
53 | #define JZ4740_IRQ_ADC_BASE JZ4740_IRQ(176) | ||
54 | |||
55 | #define NR_IRQS (JZ4740_IRQ_ADC_BASE + 6) | ||
56 | |||
57 | #endif | ||
diff --git a/arch/mips/jz4740/irq.c b/arch/mips/jz4740/irq.c new file mode 100644 index 000000000000..7d33ff83580f --- /dev/null +++ b/arch/mips/jz4740/irq.c | |||
@@ -0,0 +1,167 @@ | |||
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 | #include <asm/mach-jz4740/base.h> | ||
33 | |||
34 | static void __iomem *jz_intc_base; | ||
35 | static uint32_t jz_intc_wakeup; | ||
36 | static uint32_t jz_intc_saved; | ||
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) - JZ4740_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 int intc_irq_set_wake(unsigned int irq, unsigned int on) | ||
57 | { | ||
58 | if (on) | ||
59 | jz_intc_wakeup |= IRQ_BIT(irq); | ||
60 | else | ||
61 | jz_intc_wakeup &= ~IRQ_BIT(irq); | ||
62 | |||
63 | return 0; | ||
64 | } | ||
65 | |||
66 | static struct irq_chip intc_irq_type = { | ||
67 | .name = "INTC", | ||
68 | .mask = intc_irq_mask, | ||
69 | .mask_ack = intc_irq_mask, | ||
70 | .unmask = intc_irq_unmask, | ||
71 | .set_wake = intc_irq_set_wake, | ||
72 | }; | ||
73 | |||
74 | static irqreturn_t jz4740_cascade(int irq, void *data) | ||
75 | { | ||
76 | uint32_t irq_reg; | ||
77 | |||
78 | irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING); | ||
79 | |||
80 | if (irq_reg) | ||
81 | generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE); | ||
82 | |||
83 | return IRQ_HANDLED; | ||
84 | } | ||
85 | |||
86 | static struct irqaction jz4740_cascade_action = { | ||
87 | .handler = jz4740_cascade, | ||
88 | .name = "JZ4740 cascade interrupt", | ||
89 | }; | ||
90 | |||
91 | void __init arch_init_irq(void) | ||
92 | { | ||
93 | int i; | ||
94 | mips_cpu_irq_init(); | ||
95 | |||
96 | jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14); | ||
97 | |||
98 | for (i = JZ4740_IRQ_BASE; i < JZ4740_IRQ_BASE + 32; i++) { | ||
99 | intc_irq_mask(i); | ||
100 | set_irq_chip_and_handler(i, &intc_irq_type, handle_level_irq); | ||
101 | } | ||
102 | |||
103 | setup_irq(2, &jz4740_cascade_action); | ||
104 | } | ||
105 | |||
106 | asmlinkage void plat_irq_dispatch(void) | ||
107 | { | ||
108 | unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; | ||
109 | if (pending & STATUSF_IP2) | ||
110 | do_IRQ(2); | ||
111 | else if (pending & STATUSF_IP3) | ||
112 | do_IRQ(3); | ||
113 | else | ||
114 | spurious_interrupt(); | ||
115 | } | ||
116 | |||
117 | void jz4740_intc_suspend(void) | ||
118 | { | ||
119 | jz_intc_saved = readl(jz_intc_base + JZ_REG_INTC_MASK); | ||
120 | writel(~jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_SET_MASK); | ||
121 | writel(jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_CLEAR_MASK); | ||
122 | } | ||
123 | |||
124 | void jz4740_intc_resume(void) | ||
125 | { | ||
126 | writel(~jz_intc_saved, jz_intc_base + JZ_REG_INTC_CLEAR_MASK); | ||
127 | writel(jz_intc_saved, jz_intc_base + JZ_REG_INTC_SET_MASK); | ||
128 | } | ||
129 | |||
130 | #ifdef CONFIG_DEBUG_FS | ||
131 | |||
132 | static inline void intc_seq_reg(struct seq_file *s, const char *name, | ||
133 | unsigned int reg) | ||
134 | { | ||
135 | seq_printf(s, "%s:\t\t%08x\n", name, readl(jz_intc_base + reg)); | ||
136 | } | ||
137 | |||
138 | static int intc_regs_show(struct seq_file *s, void *unused) | ||
139 | { | ||
140 | intc_seq_reg(s, "Status", JZ_REG_INTC_STATUS); | ||
141 | intc_seq_reg(s, "Mask", JZ_REG_INTC_MASK); | ||
142 | intc_seq_reg(s, "Pending", JZ_REG_INTC_PENDING); | ||
143 | |||
144 | return 0; | ||
145 | } | ||
146 | |||
147 | static int intc_regs_open(struct inode *inode, struct file *file) | ||
148 | { | ||
149 | return single_open(file, intc_regs_show, NULL); | ||
150 | } | ||
151 | |||
152 | static const struct file_operations intc_regs_operations = { | ||
153 | .open = intc_regs_open, | ||
154 | .read = seq_read, | ||
155 | .llseek = seq_lseek, | ||
156 | .release = single_release, | ||
157 | }; | ||
158 | |||
159 | static int __init intc_debugfs_init(void) | ||
160 | { | ||
161 | (void) debugfs_create_file("jz_regs_intc", S_IFREG | S_IRUGO, | ||
162 | NULL, NULL, &intc_regs_operations); | ||
163 | return 0; | ||
164 | } | ||
165 | subsys_initcall(intc_debugfs_init); | ||
166 | |||
167 | #endif | ||
diff --git a/arch/mips/jz4740/irq.h b/arch/mips/jz4740/irq.h new file mode 100644 index 000000000000..56b5eadd1fa2 --- /dev/null +++ b/arch/mips/jz4740/irq.h | |||
@@ -0,0 +1,21 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify it | ||
5 | * under the terms of the GNU General Public License as published by the | ||
6 | * Free Software Foundation; either version 2 of the License, or (at your | ||
7 | * option) any later version. | ||
8 | * | ||
9 | * You should have received a copy of the GNU General Public License along | ||
10 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
11 | * 675 Mass Ave, Cambridge, MA 02139, USA. | ||
12 | * | ||
13 | */ | ||
14 | |||
15 | #ifndef __MIPS_JZ4740_IRQ_H__ | ||
16 | #define __MIPS_JZ4740_IRQ_H__ | ||
17 | |||
18 | extern void jz4740_intc_suspend(void); | ||
19 | extern void jz4740_intc_resume(void); | ||
20 | |||
21 | #endif | ||