arch/arm/mach-mmp/irq.c

   1 /*
   2  *  linux/arch/arm/mach-mmp/irq.c
   3  *
   4  *  Generic IRQ handling, GPIO IRQ demultiplexing, etc.
   5  *
   6  *  Author:     Bin Yang <bin.yang@marvell.com>
   7  *  Created:    Sep 30, 2008
   8  *  Copyright:  Marvell International Ltd.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <linux/io.h>
  18
  19 #include <mach/regs-icu.h>
  20
  21 #include "common.h"
  22
  23 #define IRQ_ROUTE_TO_AP         (ICU_INT_CONF_AP_INT | ICU_INT_CONF_IRQ)
  24
  25 #define PRIORITY_DEFAULT        0x1
  26 #define PRIORITY_NONE           0x0     /* means IRQ disabled */
  27
  28 static void icu_mask_irq(unsigned int irq)
  29 {
  30         __raw_writel(PRIORITY_NONE, ICU_INT_CONF(irq));
  31 }
  32
  33 static void icu_unmask_irq(unsigned int irq)
  34 {
  35         __raw_writel(IRQ_ROUTE_TO_AP | PRIORITY_DEFAULT, ICU_INT_CONF(irq));
  36 }
  37
  38 static struct irq_chip icu_irq_chip = {
  39         .name   = "icu_irq",
  40         .ack    = icu_mask_irq,
  41         .mask   = icu_mask_irq,
  42         .unmask = icu_unmask_irq,
  43 };
  44
  45 void __init icu_init_irq(void)
  46 {
  47         int irq;
  48
  49         for (irq = 0; irq < 64; irq++) {
  50                 icu_mask_irq(irq);
  51                 set_irq_chip(irq, &icu_irq_chip);
  52                 set_irq_handler(irq, handle_level_irq);
  53                 set_irq_flags(irq, IRQF_VALID);
  54         }
  55 }