LXR linux/arch/arm/mach-orion5x/irq.c

   1/*
   2 * arch/arm/mach-orion5x/irq.c
   3 *
   4 * Core IRQ functions for Marvell Orion System On Chip
   5 *
   6 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
   7 *
   8 * This file is licensed under the terms of the GNU General Public
   9 * License version 2.  This program is licensed "as is" without any
  10 * warranty of any kind, whether express or implied.
  11 */
  12#include <linux/gpio.h>
  13#include <linux/kernel.h>
  14#include <linux/irq.h>
  15#include <linux/io.h>
  16#include <plat/orion-gpio.h>
  17#include <plat/irq.h>
  18#include <asm/exception.h>
  19#include "bridge-regs.h"
  20#include "common.h"
  21
  22static int __initdata gpio0_irqs[4] = {
  23        IRQ_ORION5X_GPIO_0_7,
  24        IRQ_ORION5X_GPIO_8_15,
  25        IRQ_ORION5X_GPIO_16_23,
  26        IRQ_ORION5X_GPIO_24_31,
  27};
  28
  29static asmlinkage void
  30__exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
  31{
  32        u32 stat;
  33
  34        stat = readl_relaxed(MAIN_IRQ_CAUSE);
  35        stat &= readl_relaxed(MAIN_IRQ_MASK);
  36        if (stat) {
  37                unsigned int hwirq = 1 + __fls(stat);
  38                handle_IRQ(hwirq, regs);
  39                return;
  40        }
  41}
  42
  43void __init orion5x_init_irq(void)
  44{
  45        orion_irq_init(1, MAIN_IRQ_MASK);
  46
  47        set_handle_irq(orion5x_legacy_handle_irq);
  48
  49        /*
  50         * Initialize gpiolib for GPIOs 0-31.
  51         */
  52        orion_gpio_init(NULL, 0, 32, GPIO_VIRT_BASE, 0,
  53                        IRQ_ORION5X_GPIO_START, gpio0_irqs);
  54}
  55