LXR linux/arch/arm/mach-s3c24xx/irq-s3c244x.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/device.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
  43static 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
  70static void
  71s3c_irq_cam_mask(struct irq_data *data)
  72{
  73        s3c_irqsub_mask(data->irq, INTMSK_CAM, 3 << 11);
  74}
  75
  76static void
  77s3c_irq_cam_unmask(struct irq_data *data)
  78{
  79        s3c_irqsub_unmask(data->irq, INTMSK_CAM);
  80}
  81
  82static void
  83s3c_irq_cam_ack(struct irq_data *data)
  84{
  85        s3c_irqsub_maskack(data->irq, INTMSK_CAM, 3 << 11);
  86}
  87
  88static 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
  94static int s3c244x_irq_add(struct device *dev, struct subsys_interface *sif)
  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
 117static struct subsys_interface s3c2440_irq_interface = {
 118        .name           = "s3c2440_irq",
 119        .subsys         = &s3c2440_subsys,
 120        .add_dev        = s3c244x_irq_add,
 121};
 122
 123static int s3c2440_irq_init(void)
 124{
 125        return subsys_interface_register(&s3c2440_irq_interface);
 126}
 127
 128arch_initcall(s3c2440_irq_init);
 129
 130static struct subsys_interface s3c2442_irq_interface = {
 131        .name           = "s3c2442_irq",
 132        .subsys         = &s3c2442_subsys,
 133        .add_dev        = s3c244x_irq_add,
 134};
 135
 136
 137static int s3c2442_irq_init(void)
 138{
 139        return subsys_interface_register(&s3c2442_irq_interface);
 140}
 141
 142arch_initcall(s3c2442_irq_init);
 143