LXR linux/arch/arm/plat-stmp3xxx/irq.c

   1/*
   2 * Freescale STMP37XX/STMP378X common interrupt handling code
   3 *
   4 * Author: Vladislav Buzov <vbuzov@embeddedalley.com>
   5 *
   6 * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
   7 * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
   8 */
   9
  10/*
  11 * The code contained herein is licensed under the GNU General Public
  12 * License. You may obtain a copy of the GNU General Public License
  13 * Version 2 or later at the following locations:
  14 *
  15 * http://www.opensource.org/licenses/gpl-license.html
  16 * http://www.gnu.org/copyleft/gpl.html
  17 */
  18#include <linux/init.h>
  19#include <linux/interrupt.h>
  20#include <linux/delay.h>
  21#include <linux/irq.h>
  22#include <linux/sysdev.h>
  23
  24#include <mach/stmp3xxx.h>
  25#include <mach/platform.h>
  26#include <mach/regs-icoll.h>
  27
  28void __init stmp3xxx_init_irq(struct irq_chip *chip)
  29{
  30        unsigned int i, lv;
  31
  32        /* Reset the interrupt controller */
  33        stmp3xxx_reset_block(REGS_ICOLL_BASE + HW_ICOLL_CTRL, true);
  34
  35        /* Disable all interrupts initially */
  36        for (i = 0; i < NR_REAL_IRQS; i++) {
  37                chip->mask(i);
  38                set_irq_chip(i, chip);
  39                set_irq_handler(i, handle_level_irq);
  40                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
  41        }
  42
  43        /* Ensure vector is cleared */
  44        for (lv = 0; lv < 4; lv++)
  45                __raw_writel(1 << lv, REGS_ICOLL_BASE + HW_ICOLL_LEVELACK);
  46        __raw_writel(0, REGS_ICOLL_BASE + HW_ICOLL_VECTOR);
  47
  48        /* Barrier */
  49        (void)__raw_readl(REGS_ICOLL_BASE + HW_ICOLL_STAT);
  50}
  51
  52