arch/arm/mach-lh7a40x/irq-lh7a400.c

   1 /* arch/arm/mach-lh7a40x/irq-lh7a400.c
   2  *
   3  *  Copyright (C) 2004 Coastal Environmental Systems
   4  *
   5  *  This program is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU General Public License
   7  *  version 2 as published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14
  15 #include <mach/hardware.h>
  16 #include <asm/irq.h>
  17 #include <asm/mach/irq.h>
  18 #include <mach/irqs.h>
  19
  20 #include "common.h"
  21
  22   /* CPU IRQ handling */
  23
  24 static void lh7a400_mask_irq (u32 irq)
  25 {
  26         INTC_INTENC = (1 << irq);
  27 }
  28
  29 static void lh7a400_unmask_irq (u32 irq)
  30 {
  31         INTC_INTENS = (1 << irq);
  32 }
  33
  34 static void lh7a400_ack_gpio_irq (u32 irq)
  35 {
  36         GPIO_GPIOFEOI = (1 << IRQ_TO_GPIO (irq));
  37         INTC_INTENC = (1 << irq);
  38 }
  39
  40 static struct irq_chip lh7a400_internal_chip = {
  41         .name   = "MPU",
  42         .ack    = lh7a400_mask_irq, /* Level triggering -> mask is ack */
  43         .mask   = lh7a400_mask_irq,
  44         .unmask = lh7a400_unmask_irq,
  45 };
  46
  47 static struct irq_chip lh7a400_gpio_chip = {
  48         .name   = "GPIO",
  49         .ack    = lh7a400_ack_gpio_irq,
  50         .mask   = lh7a400_mask_irq,
  51         .unmask = lh7a400_unmask_irq,
  52 };
  53
  54
  55   /* IRQ initialization */
  56
  57 void __init lh7a400_init_irq (void)
  58 {
  59         int irq;
  60
  61         INTC_INTENC = 0xffffffff;       /* Disable all interrupts */
  62         GPIO_GPIOFINTEN = 0x00;         /* Disable all GPIOF interrupts */
  63         barrier ();
  64
  65         for (irq = 0; irq < NR_IRQS; ++irq) {
  66                 switch (irq) {
  67                 case IRQ_GPIO0INTR:
  68                 case IRQ_GPIO1INTR:
  69                 case IRQ_GPIO2INTR:
  70                 case IRQ_GPIO3INTR:
  71                 case IRQ_GPIO4INTR:
  72                 case IRQ_GPIO5INTR:
  73                 case IRQ_GPIO6INTR:
  74                 case IRQ_GPIO7INTR:
  75                         set_irq_chip (irq, &lh7a400_gpio_chip);
  76                         set_irq_handler (irq, handle_level_irq); /* OK default */
  77                         break;
  78                 default:
  79                         set_irq_chip (irq, &lh7a400_internal_chip);
  80                         set_irq_handler (irq, handle_level_irq);
  81                 }
  82                 set_irq_flags (irq, IRQF_VALID);
  83         }
  84
  85         lh7a40x_init_board_irq ();
  86
  87 /* *** FIXME: the LH7a400 does use FIQ interrupts in some cases.  For
  88    the time being, these are not initialized. */
  89
  90 /*      init_FIQ(); */
  91 }