arch/arm/mach-s3c2410/s3c2440-irq.c

   1 /* linux/arch/arm/mach-s3c2410/s3c2440-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  * Changelog:
  21  *      25-Jul-2005 BJD         Split from irq.c
  22  *
  23 */
  24
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/ioport.h>
  29 #include <linux/ptrace.h>
  30 #include <linux/sysdev.h>
  31
  32 #include <asm/hardware.h>
  33 #include <asm/irq.h>
  34 #include <asm/io.h>
  35
  36 #include <asm/mach/irq.h>
  37
  38 #include <asm/arch/regs-irq.h>
  39 #include <asm/arch/regs-gpio.h>
  40
  41 #include "cpu.h"
  42 #include "pm.h"
  43 #include "irq.h"
  44
  45 /* WDT/AC97 */
  46
  47 static void s3c_irq_demux_wdtac97(unsigned int irq,
  48                                   struct irqdesc *desc,
  49                                   struct pt_regs *regs)
  50 {
  51         unsigned int subsrc, submsk;
  52         struct irqdesc *mydesc;
  53
  54         /* read the current pending interrupts, and the mask
  55          * for what it is available */
  56
  57         subsrc = __raw_readl(S3C2410_SUBSRCPND);
  58         submsk = __raw_readl(S3C2410_INTSUBMSK);
  59
  60         subsrc &= ~submsk;
  61         subsrc >>= 13;
  62         subsrc &= 3;
  63
  64         if (subsrc != 0) {
  65                 if (subsrc & 1) {
  66                         mydesc = irq_desc + IRQ_S3C2440_WDT;
  67                         desc_handle_irq(IRQ_S3C2440_WDT, mydesc, regs);
  68                 }
  69                 if (subsrc & 2) {
  70                         mydesc = irq_desc + IRQ_S3C2440_AC97;
  71                         desc_handle_irq(IRQ_S3C2440_AC97, mydesc, regs);
  72                 }
  73         }
  74 }
  75
  76
  77 #define INTMSK_WDT       (1UL << (IRQ_WDT - IRQ_EINT0))
  78
  79 static void
  80 s3c_irq_wdtac97_mask(unsigned int irqno)
  81 {
  82         s3c_irqsub_mask(irqno, INTMSK_WDT, 3<<13);
  83 }
  84
  85 static void
  86 s3c_irq_wdtac97_unmask(unsigned int irqno)
  87 {
  88         s3c_irqsub_unmask(irqno, INTMSK_WDT);
  89 }
  90
  91 static void
  92 s3c_irq_wdtac97_ack(unsigned int irqno)
  93 {
  94         s3c_irqsub_maskack(irqno, INTMSK_WDT, 3<<13);
  95 }
  96
  97 static struct irqchip s3c_irq_wdtac97 = {
  98         .mask       = s3c_irq_wdtac97_mask,
  99         .unmask     = s3c_irq_wdtac97_unmask,
 100         .ack        = s3c_irq_wdtac97_ack,
 101 };
 102
 103 static int s3c2440_irq_add(struct sys_device *sysdev)
 104 {
 105         unsigned int irqno;
 106
 107         printk("S3C2440: IRQ Support\n");
 108
 109         /* add new chained handler for wdt, ac7 */
 110
 111         set_irq_chip(IRQ_WDT, &s3c_irq_level_chip);
 112         set_irq_handler(IRQ_WDT, do_level_IRQ);
 113         set_irq_chained_handler(IRQ_WDT, s3c_irq_demux_wdtac97);
 114
 115         for (irqno = IRQ_S3C2440_WDT; irqno <= IRQ_S3C2440_AC97; irqno++) {
 116                 set_irq_chip(irqno, &s3c_irq_wdtac97);
 117                 set_irq_handler(irqno, do_level_IRQ);
 118                 set_irq_flags(irqno, IRQF_VALID);
 119         }
 120
 121         return 0;
 122 }
 123
 124 static struct sysdev_driver s3c2440_irq_driver = {
 125         .add    = s3c2440_irq_add,
 126 };
 127
 128 static int s3c2440_irq_init(void)
 129 {
 130         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
 131 }
 132
 133 arch_initcall(s3c2440_irq_init);
 134