arch/arm/mach-s3c2410/s3c244x-irq.c

   1 /* linux/arch/arm/mach-s3c2410/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/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 "pm.h"
  40 #include "irq.h"
  41
  42 /* camera irq */
  43
  44 static void s3c_irq_demux_cam(unsigned int irq,
  45                               struct irqdesc *desc)
  46 {
  47         unsigned int subsrc, submsk;
  48         struct irqdesc *mydesc;
  49
  50         /* read the current pending interrupts, and the mask
  51          * for what it is available */
  52
  53         subsrc = __raw_readl(S3C2410_SUBSRCPND);
  54         submsk = __raw_readl(S3C2410_INTSUBMSK);
  55
  56         subsrc &= ~submsk;
  57         subsrc >>= 11;
  58         subsrc &= 3;
  59
  60         if (subsrc != 0) {
  61                 if (subsrc & 1) {
  62                         mydesc = irq_desc + IRQ_S3C2440_CAM_C;
  63                         desc_handle_irq(IRQ_S3C2440_CAM_C, mydesc);
  64                 }
  65                 if (subsrc & 2) {
  66                         mydesc = irq_desc + IRQ_S3C2440_CAM_P;
  67                         desc_handle_irq(IRQ_S3C2440_CAM_P, mydesc);
  68                 }
  69         }
  70 }
  71
  72 #define INTMSK_CAM (1UL << (IRQ_CAM - IRQ_EINT0))
  73
  74 static void
  75 s3c_irq_cam_mask(unsigned int irqno)
  76 {
  77         s3c_irqsub_mask(irqno, INTMSK_CAM, 3<<11);
  78 }
  79
  80 static void
  81 s3c_irq_cam_unmask(unsigned int irqno)
  82 {
  83         s3c_irqsub_unmask(irqno, INTMSK_CAM);
  84 }
  85
  86 static void
  87 s3c_irq_cam_ack(unsigned int irqno)
  88 {
  89         s3c_irqsub_maskack(irqno, INTMSK_CAM, 3<<11);
  90 }
  91
  92 static struct irqchip s3c_irq_cam = {
  93         .mask       = s3c_irq_cam_mask,
  94         .unmask     = s3c_irq_cam_unmask,
  95         .ack        = s3c_irq_cam_ack,
  96 };
  97
  98 static int s3c244x_irq_add(struct sys_device *sysdev)
  99 {
 100         unsigned int irqno;
 101
 102         set_irq_chip(IRQ_NFCON, &s3c_irq_level_chip);
 103         set_irq_handler(IRQ_NFCON, do_level_IRQ);
 104         set_irq_flags(IRQ_NFCON, IRQF_VALID);
 105
 106         /* add chained handler for camera */
 107
 108         set_irq_chip(IRQ_CAM, &s3c_irq_level_chip);
 109         set_irq_handler(IRQ_CAM, do_level_IRQ);
 110         set_irq_chained_handler(IRQ_CAM, s3c_irq_demux_cam);
 111
 112         for (irqno = IRQ_S3C2440_CAM_C; irqno <= IRQ_S3C2440_CAM_P; irqno++) {
 113                 set_irq_chip(irqno, &s3c_irq_cam);
 114                 set_irq_handler(irqno, do_level_IRQ);
 115                 set_irq_flags(irqno, IRQF_VALID);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static struct sysdev_driver s3c2440_irq_driver = {
 122         .add            = s3c244x_irq_add,
 123         .suspend        = s3c24xx_irq_suspend,
 124         .resume         = s3c24xx_irq_resume,
 125 };
 126
 127 static int s3c2440_irq_init(void)
 128 {
 129         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
 130 }
 131
 132 arch_initcall(s3c2440_irq_init);
 133
 134 static struct sysdev_driver s3c2442_irq_driver = {
 135         .add            = s3c244x_irq_add,
 136         .suspend        = s3c24xx_irq_suspend,
 137         .resume         = s3c24xx_irq_resume,
 138 };
 139
 140
 141 static int s3c2442_irq_init(void)
 142 {
 143         return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_irq_driver);
 144 }
 145
 146 arch_initcall(s3c2442_irq_init);