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);