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 #include <linux/ptrace.h>
  15
  16 #include <asm/hardware.h>
  17 #include <asm/irq.h>
  18 #include <asm/mach/irq.h>
  19 #include <asm/arch/irqs.h>
  20
  21 #include "common.h"
  22
  23   /* CPU IRQ handling */
  24
  25 static void lh7a400_mask_irq (u32 irq)
  26 {
  27         INTC_INTENC = (1 << irq);
  28 }
  29
  30 static void lh7a400_unmask_irq (u32 irq)
  31 {
  32         INTC_INTENS = (1 << irq);
  33 }
  34
  35 static void lh7a400_ack_gpio_irq (u32 irq)
  36 {
  37         GPIO_GPIOFEOI = (1 << IRQ_TO_GPIO (irq));
  38         INTC_INTENC = (1 << irq);
  39 }
  40
  41 static struct irq_chip lh7a400_internal_chip = {
  42         .name   = "MPU",
  43         .ack    = lh7a400_mask_irq, /* Level triggering -> mask is ack */
  44         .mask   = lh7a400_mask_irq,
  45         .unmask = lh7a400_unmask_irq,
  46 };
  47
  48 static struct irq_chip lh7a400_gpio_chip = {
  49         .name   = "GPIO",
  50         .ack    = lh7a400_ack_gpio_irq,
  51         .mask   = lh7a400_mask_irq,
  52         .unmask = lh7a400_unmask_irq,
  53 };
  54
  55
  56   /* IRQ initialization */
  57
  58 void __init lh7a400_init_irq (void)
  59 {
  60         int irq;
  61
  62         INTC_INTENC = 0xffffffff;       /* Disable all interrupts */
  63         GPIO_GPIOFINTEN = 0x00;         /* Disable all GPIOF interrupts */
  64         barrier ();
  65
  66         for (irq = 0; irq < NR_IRQS; ++irq) {
  67                 switch (irq) {
  68                 case IRQ_GPIO0INTR:
  69                 case IRQ_GPIO1INTR:
  70                 case IRQ_GPIO2INTR:
  71                 case IRQ_GPIO3INTR:
  72                 case IRQ_GPIO4INTR:
  73                 case IRQ_GPIO5INTR:
  74                 case IRQ_GPIO6INTR:
  75                 case IRQ_GPIO7INTR:
  76                         set_irq_chip (irq, &lh7a400_gpio_chip);
  77                         set_irq_handler (irq, do_level_IRQ); /* OK default */
  78                         break;
  79                 default:
  80                         set_irq_chip (irq, &lh7a400_internal_chip);
  81                         set_irq_handler (irq, do_level_IRQ);
  82                 }
  83                 set_irq_flags (irq, IRQF_VALID);
  84         }
  85
  86         lh7a40x_init_board_irq ();
  87
  88 /* *** FIXME: the LH7a400 does use FIQ interrupts in some cases.  For
  89    the time being, these are not initialized. */
  90
  91 /*      init_FIQ(); */
  92 }