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1 | /* linux/arch/arm/mach-s3c2412/s3c2412-irq.c |
2 | * | |
3 | * Copyright (c) 2006 Simtec Electronics | |
4 | * Ben Dooks <ben@simtec.co.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/sysdev.h> | |
28 | ||
29 | #include <asm/hardware.h> | |
30 | #include <asm/irq.h> | |
31 | #include <asm/io.h> | |
32 | ||
33 | #include <asm/mach/irq.h> | |
34 | ||
35 | #include <asm/arch/regs-irq.h> | |
36 | #include <asm/arch/regs-gpio.h> | |
37 | ||
38 | #include "cpu.h" | |
39 | #include "irq.h" | |
1e582fc7 | 40 | #include "pm.h" |
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41 | |
42 | /* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by | |
43 | * having them turn up in both the INT* and the EINT* registers. Whilst | |
44 | * both show the status, they both now need to be acked when the IRQs | |
45 | * go off. | |
46 | */ | |
47 | ||
48 | static void | |
49 | s3c2412_irq_mask(unsigned int irqno) | |
50 | { | |
51 | unsigned long bitval = 1UL << (irqno - IRQ_EINT0); | |
52 | unsigned long mask; | |
53 | ||
54 | mask = __raw_readl(S3C2410_INTMSK); | |
55 | __raw_writel(mask | bitval, S3C2410_INTMSK); | |
56 | ||
57 | mask = __raw_readl(S3C2412_EINTMASK); | |
58 | __raw_writel(mask | bitval, S3C2412_EINTMASK); | |
59 | } | |
60 | ||
61 | static inline void | |
62 | s3c2412_irq_ack(unsigned int irqno) | |
63 | { | |
64 | unsigned long bitval = 1UL << (irqno - IRQ_EINT0); | |
65 | ||
66 | __raw_writel(bitval, S3C2412_EINTPEND); | |
67 | __raw_writel(bitval, S3C2410_SRCPND); | |
68 | __raw_writel(bitval, S3C2410_INTPND); | |
69 | } | |
70 | ||
71 | static inline void | |
72 | s3c2412_irq_maskack(unsigned int irqno) | |
73 | { | |
74 | unsigned long bitval = 1UL << (irqno - IRQ_EINT0); | |
75 | unsigned long mask; | |
76 | ||
77 | mask = __raw_readl(S3C2410_INTMSK); | |
78 | __raw_writel(mask|bitval, S3C2410_INTMSK); | |
79 | ||
80 | mask = __raw_readl(S3C2412_EINTMASK); | |
81 | __raw_writel(mask | bitval, S3C2412_EINTMASK); | |
82 | ||
83 | __raw_writel(bitval, S3C2412_EINTPEND); | |
84 | __raw_writel(bitval, S3C2410_SRCPND); | |
85 | __raw_writel(bitval, S3C2410_INTPND); | |
86 | } | |
87 | ||
88 | static void | |
89 | s3c2412_irq_unmask(unsigned int irqno) | |
90 | { | |
91 | unsigned long bitval = 1UL << (irqno - IRQ_EINT0); | |
92 | unsigned long mask; | |
93 | ||
94 | mask = __raw_readl(S3C2412_EINTMASK); | |
95 | __raw_writel(mask & ~bitval, S3C2412_EINTMASK); | |
96 | ||
97 | mask = __raw_readl(S3C2410_INTMSK); | |
98 | __raw_writel(mask & ~bitval, S3C2410_INTMSK); | |
99 | } | |
100 | ||
10dd5ce2 | 101 | static struct irq_chip s3c2412_irq_eint0t4 = { |
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102 | .ack = s3c2412_irq_ack, |
103 | .mask = s3c2412_irq_mask, | |
104 | .unmask = s3c2412_irq_unmask, | |
105 | .set_wake = s3c_irq_wake, | |
106 | .set_type = s3c_irqext_type, | |
107 | }; | |
108 | ||
109 | static int s3c2412_irq_add(struct sys_device *sysdev) | |
110 | { | |
111 | unsigned int irqno; | |
112 | ||
113 | for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) { | |
114 | set_irq_chip(irqno, &s3c2412_irq_eint0t4); | |
10dd5ce2 | 115 | set_irq_handler(irqno, handle_edge_irq); |
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116 | set_irq_flags(irqno, IRQF_VALID); |
117 | } | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static struct sysdev_driver s3c2412_irq_driver = { | |
123 | .add = s3c2412_irq_add, | |
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124 | .suspend = s3c24xx_irq_suspend, |
125 | .resume = s3c24xx_irq_resume, | |
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126 | }; |
127 | ||
128 | static int s3c2412_irq_init(void) | |
129 | { | |
130 | return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver); | |
131 | } | |
132 | ||
133 | arch_initcall(s3c2412_irq_init); |