arch/arm/mach-espd_4510b/irq.c

   1 /*
   2  *  linux/arch/armnommu/mach-espd_4510b/irq.c
   3  *
   4  *  Copyright (c) 2004  Cucy Systems (http://www.cucy.com)
   5  *  Curt Brune <curt@cucy.com>
   6  *
   7  *  Copyright (C) 2003 SAMSUNG ELECTRONICS
   8  *            Hyok S. Choi (hyok.choi@samsung.com)
   9  * based the codes by
  10  *     2003 Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
  11  *
  12  */
  13 #include <linux/types.h>
  14 #include <linux/sched.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/list.h>
  20 #include <linux/device.h>
  21 #include <linux/slab.h>
  22 #include <linux/string.h>
  23 #include <linux/sysdev.h>
  24
  25 #include <asm/hardware.h>
  26 #include <asm/io.h>
  27 #include <asm/irq.h>
  28 #include <asm/setup.h>
  29 #include <asm/mach-types.h>
  30
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/irq.h>
  33 #include <asm/mach/map.h>
  34
  35 static void __s3c4510b_mask_irq(unsigned int irq)
  36 {
  37         INT_DISABLE( irq);
  38 }
  39
  40 static void __s3c4510b_unmask_irq(unsigned int irq)
  41 {
  42         INT_ENABLE( irq);
  43 }
  44
  45 static void __s3c4510b_ack_irq(unsigned int irq)
  46 {
  47         /* Acknowledge, clear _AND_ disable the interrupt. */
  48         INT_DISABLE( irq);
  49         CLEAR_PEND_INT( irq);
  50 }
  51
  52 static struct irqchip s3c4510b_chip = {
  53         .ack    = __s3c4510b_ack_irq,
  54         .mask   = __s3c4510b_mask_irq,
  55         .unmask = __s3c4510b_unmask_irq,
  56 };
  57
  58 #ifdef CONFIG_PM
  59 static unsigned long ic_irq_enable;
  60
  61 static int irq_suspend(struct sys_device *dev, u32 state)
  62 {
  63         return 0;
  64 }
  65
  66 static int irq_resume(struct sys_device *dev)
  67 {
  68         /* disable all irq sources */
  69         return 0;
  70 }
  71 #else
  72 #define irq_suspend NULL
  73 #define irq_resume NULL
  74 #endif
  75
  76 static struct sysdev_class irq_class = {
  77         set_kset_name("irq"),
  78         .suspend        = irq_suspend,
  79         .resume         = irq_resume,
  80 };
  81
  82 static struct sys_device irq_device = {
  83         .id     = 0,
  84         .cls    = &irq_class,
  85 };
  86
  87 static int __init irq_init_sysfs(void)
  88 {
  89         int ret = sysdev_class_register(&irq_class);
  90         if (ret == 0)
  91                 ret = sysdev_register(&irq_device);
  92         return ret;
  93 }
  94
  95 device_initcall(irq_init_sysfs);
  96
  97 void __init s3c4510b_init_irq(void)
  98 {
  99         int irq;
 100
 101         for (irq = 0; irq < NR_IRQS; irq++) {
 102                 set_irq_chip(irq, &s3c4510b_chip);
 103                 set_irq_handler(irq, do_level_IRQ);
 104                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 105         }
 106
 107         /* mask and disable all further interrupts */
 108         outl(INT_MASK_DIS, REG_INTMASK);
 109
 110         /* set all to IRQ mode, not FIQ */
 111         outl(INT_MODE_IRQ, REG_INTMODE);
 112
 113         /* Clear Intrerrupt pending register    */
 114         outl( 0x1FFFFF, REG_INTPEND);
 115
 116         /*
 117          * enable the gloabal interrupt flag, this should be
 118          * safe now, all sources are masked out and acknowledged
 119          */
 120         INT_ENABLE( INT_GLOBAL);
 121 }
 122