arch/arm/mach-s3c2443/irq.c

   1 /* linux/arch/arm/mach-s3c2443/irq.c
   2  *
   3  * Copyright (c) 2007 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 <asm/plat-s3c24xx/cpu.h>
  39 #include <asm/plat-s3c24xx/pm.h>
  40 #include <asm/plat-s3c24xx/irq.h>
  41
  42 /* WDT/AC97 */
  43
  44 static void s3c_irq_demux_wdtac97(unsigned int irq,
  45                                   struct irq_desc *desc)
  46 {
  47         unsigned int subsrc, submsk;
  48         struct irq_desc *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 >>= 27;
  58         subsrc &= 3;
  59
  60         if (subsrc != 0) {
  61                 if (subsrc & 1) {
  62                         mydesc = irq_desc + IRQ_S3C2443_WDT;
  63                         desc_handle_irq(IRQ_S3C2443_WDT, mydesc);
  64                 }
  65                 if (subsrc & 2) {
  66                         mydesc = irq_desc + IRQ_S3C2443_AC97;
  67                         desc_handle_irq(IRQ_S3C2443_AC97, mydesc);
  68                 }
  69         }
  70 }
  71
  72
  73 #define INTMSK_WDT       (1UL << (IRQ_WDT - IRQ_EINT0))
  74
  75 static void
  76 s3c_irq_wdtac97_mask(unsigned int irqno)
  77 {
  78         s3c_irqsub_mask(irqno, INTMSK_WDT, 3<<27);
  79 }
  80
  81 static void
  82 s3c_irq_wdtac97_unmask(unsigned int irqno)
  83 {
  84         s3c_irqsub_unmask(irqno, INTMSK_WDT);
  85 }
  86
  87 static void
  88 s3c_irq_wdtac97_ack(unsigned int irqno)
  89 {
  90         s3c_irqsub_maskack(irqno, INTMSK_WDT, 3<<27);
  91 }
  92
  93 static struct irq_chip s3c_irq_wdtac97 = {
  94         .mask       = s3c_irq_wdtac97_mask,
  95         .unmask     = s3c_irq_wdtac97_unmask,
  96         .ack        = s3c_irq_wdtac97_ack,
  97 };
  98
  99 static int s3c2443_irq_add(struct sys_device *sysdev)
 100 {
 101         unsigned int irqno;
 102
 103         printk("S3C2443: IRQ Support\n");
 104
 105         /* add new chained handler for wdt, ac7 */
 106
 107         set_irq_chip(IRQ_WDT, &s3c_irq_level_chip);
 108         set_irq_handler(IRQ_WDT, handle_level_irq);
 109         set_irq_chained_handler(IRQ_WDT, s3c_irq_demux_wdtac97);
 110
 111         for (irqno = IRQ_S3C2443_WDT; irqno <= IRQ_S3C2443_AC97; irqno++) {
 112                 set_irq_chip(irqno, &s3c_irq_wdtac97);
 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 s3c2443_irq_driver = {
 121         .add            = s3c2443_irq_add,
 122 };
 123
 124 static int s3c2443_irq_init(void)
 125 {
 126         return sysdev_driver_register(&s3c2443_sysclass, &s3c2443_irq_driver);
 127 }
 128
 129 arch_initcall(s3c2443_irq_init);
 130