arch/arm/mach-s3c2440/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 #include <linux/io.h>
  28
  29 #include <mach/hardware.h>
  30 #include <asm/irq.h>
  31
  32 #include <asm/mach/irq.h>
  33
  34 #include <mach/regs-irq.h>
  35 #include <mach/regs-gpio.h>
  36
  37 #include <plat/cpu.h>
  38 #include <plat/pm.h>
  39 #include <plat/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
  48         /* read the current pending interrupts, and the mask
  49          * for what it is available */
  50
  51         subsrc = __raw_readl(S3C2410_SUBSRCPND);
  52         submsk = __raw_readl(S3C2410_INTSUBMSK);
  53
  54         subsrc &= ~submsk;
  55         subsrc >>= 11;
  56         subsrc &= 3;
  57
  58         if (subsrc != 0) {
  59                 if (subsrc & 1) {
  60                         generic_handle_irq(IRQ_S3C2440_CAM_C);
  61                 }
  62                 if (subsrc & 2) {
  63                         generic_handle_irq(IRQ_S3C2440_CAM_P);
  64                 }
  65         }
  66 }
  67
  68 #define INTMSK_CAM (1UL << (IRQ_CAM - IRQ_EINT0))
  69
  70 static void
  71 s3c_irq_cam_mask(struct irq_data *data)
  72 {
  73         s3c_irqsub_mask(data->irq, INTMSK_CAM, 3 << 11);
  74 }
  75
  76 static void
  77 s3c_irq_cam_unmask(struct irq_data *data)
  78 {
  79         s3c_irqsub_unmask(data->irq, INTMSK_CAM);
  80 }
  81
  82 static void
  83 s3c_irq_cam_ack(struct irq_data *data)
  84 {
  85         s3c_irqsub_maskack(data->irq, INTMSK_CAM, 3 << 11);
  86 }
  87
  88 static struct irq_chip s3c_irq_cam = {
  89         .irq_mask       = s3c_irq_cam_mask,
  90         .irq_unmask     = s3c_irq_cam_unmask,
  91         .irq_ack        = s3c_irq_cam_ack,
  92 };
  93
  94 static int s3c244x_irq_add(struct sys_device *sysdev)
  95 {
  96         unsigned int irqno;
  97
  98         irq_set_chip_and_handler(IRQ_NFCON, &s3c_irq_level_chip,
  99                                  handle_level_irq);
 100         set_irq_flags(IRQ_NFCON, IRQF_VALID);
 101
 102         /* add chained handler for camera */
 103
 104         irq_set_chip_and_handler(IRQ_CAM, &s3c_irq_level_chip,
 105                                  handle_level_irq);
 106         irq_set_chained_handler(IRQ_CAM, s3c_irq_demux_cam);
 107
 108         for (irqno = IRQ_S3C2440_CAM_C; irqno <= IRQ_S3C2440_CAM_P; irqno++) {
 109                 irq_set_chip_and_handler(irqno, &s3c_irq_cam,
 110                                          handle_level_irq);
 111                 set_irq_flags(irqno, IRQF_VALID);
 112         }
 113
 114         return 0;
 115 }
 116
 117 static struct sysdev_driver s3c2440_irq_driver = {
 118         .add            = s3c244x_irq_add,
 119 };
 120
 121 static int s3c2440_irq_init(void)
 122 {
 123         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
 124 }
 125
 126 arch_initcall(s3c2440_irq_init);
 127
 128 static struct sysdev_driver s3c2442_irq_driver = {
 129         .add            = s3c244x_irq_add,
 130 };
 131
 132
 133 static int s3c2442_irq_init(void)
 134 {
 135         return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_irq_driver);
 136 }
 137
 138 arch_initcall(s3c2442_irq_init);