Merge branch 'linus' into x86/doc
[linux-2.6] / arch / arm / plat-s3c24xx / s3c244x-irq.c
1 /* linux/arch/arm/plat-s3c24xx/s3c244x-irq.c
2  *
3  * Copyright (c) 2003,2004 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/sysdev.h>
27
28 #include <mach/hardware.h>
29 #include <asm/irq.h>
30 #include <asm/io.h>
31
32 #include <asm/mach/irq.h>
33
34 #include <mach/regs-irq.h>
35 #include <mach/regs-gpio.h>
36
37 #include <asm/plat-s3c24xx/cpu.h>
38 #include <asm/plat-s3c24xx/pm.h>
39 #include <asm/plat-s3c24xx/irq.h>
40
41 /* camera irq */
42
43 static void s3c_irq_demux_cam(unsigned int irq,
44                               struct irq_desc *desc)
45 {
46         unsigned int subsrc, submsk;
47         struct irq_desc *mydesc;
48
49         /* read the current pending interrupts, and the mask
50          * for what it is available */
51
52         subsrc = __raw_readl(S3C2410_SUBSRCPND);
53         submsk = __raw_readl(S3C2410_INTSUBMSK);
54
55         subsrc &= ~submsk;
56         subsrc >>= 11;
57         subsrc &= 3;
58
59         if (subsrc != 0) {
60                 if (subsrc & 1) {
61                         mydesc = irq_desc + IRQ_S3C2440_CAM_C;
62                         desc_handle_irq(IRQ_S3C2440_CAM_C, mydesc);
63                 }
64                 if (subsrc & 2) {
65                         mydesc = irq_desc + IRQ_S3C2440_CAM_P;
66                         desc_handle_irq(IRQ_S3C2440_CAM_P, mydesc);
67                 }
68         }
69 }
70
71 #define INTMSK_CAM (1UL << (IRQ_CAM - IRQ_EINT0))
72
73 static void
74 s3c_irq_cam_mask(unsigned int irqno)
75 {
76         s3c_irqsub_mask(irqno, INTMSK_CAM, 3<<11);
77 }
78
79 static void
80 s3c_irq_cam_unmask(unsigned int irqno)
81 {
82         s3c_irqsub_unmask(irqno, INTMSK_CAM);
83 }
84
85 static void
86 s3c_irq_cam_ack(unsigned int irqno)
87 {
88         s3c_irqsub_maskack(irqno, INTMSK_CAM, 3<<11);
89 }
90
91 static struct irq_chip s3c_irq_cam = {
92         .mask       = s3c_irq_cam_mask,
93         .unmask     = s3c_irq_cam_unmask,
94         .ack        = s3c_irq_cam_ack,
95 };
96
97 static int s3c244x_irq_add(struct sys_device *sysdev)
98 {
99         unsigned int irqno;
100
101         set_irq_chip(IRQ_NFCON, &s3c_irq_level_chip);
102         set_irq_handler(IRQ_NFCON, handle_level_irq);
103         set_irq_flags(IRQ_NFCON, IRQF_VALID);
104
105         /* add chained handler for camera */
106
107         set_irq_chip(IRQ_CAM, &s3c_irq_level_chip);
108         set_irq_handler(IRQ_CAM, handle_level_irq);
109         set_irq_chained_handler(IRQ_CAM, s3c_irq_demux_cam);
110
111         for (irqno = IRQ_S3C2440_CAM_C; irqno <= IRQ_S3C2440_CAM_P; irqno++) {
112                 set_irq_chip(irqno, &s3c_irq_cam);
113                 set_irq_handler(irqno, handle_level_irq);
114                 set_irq_flags(irqno, IRQF_VALID);
115         }
116
117         return 0;
118 }
119
120 static struct sysdev_driver s3c2440_irq_driver = {
121         .add            = s3c244x_irq_add,
122         .suspend        = s3c24xx_irq_suspend,
123         .resume         = s3c24xx_irq_resume,
124 };
125
126 static int s3c2440_irq_init(void)
127 {
128         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
129 }
130
131 arch_initcall(s3c2440_irq_init);
132
133 static struct sysdev_driver s3c2442_irq_driver = {
134         .add            = s3c244x_irq_add,
135         .suspend        = s3c24xx_irq_suspend,
136         .resume         = s3c24xx_irq_resume,
137 };
138
139
140 static int s3c2442_irq_init(void)
141 {
142         return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_irq_driver);
143 }
144
145 arch_initcall(s3c2442_irq_init);