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

   1/*
   2 * arch/arm/mach-dove/irq.c
   3 *
   4 * Dove IRQ handling.
   5 *
   6 * This file is licensed under the terms of the GNU General Public
   7 * License version 2.  This program is licensed "as is" without any
   8 * warranty of any kind, whether express or implied.
   9 */
  10#include <linux/init.h>
  11#include <linux/irq.h>
  12#include <linux/io.h>
  13#include <asm/exception.h>
  14#include <plat/irq.h>
  15#include <mach/bridge-regs.h>
  16#include <plat/orion-gpio.h>
  17#include "common.h"
  18
  19static int __initdata gpio0_irqs[4] = {
  20        IRQ_DOVE_GPIO_0_7,
  21        IRQ_DOVE_GPIO_8_15,
  22        IRQ_DOVE_GPIO_16_23,
  23        IRQ_DOVE_GPIO_24_31,
  24};
  25
  26static int __initdata gpio1_irqs[4] = {
  27        IRQ_DOVE_HIGH_GPIO,
  28        0,
  29        0,
  30        0,
  31};
  32
  33static int __initdata gpio2_irqs[4] = {
  34        0,
  35        0,
  36        0,
  37        0,
  38};
  39
  40static void __iomem *dove_irq_base = IRQ_VIRT_BASE;
  41
  42static asmlinkage void
  43__exception_irq_entry dove_legacy_handle_irq(struct pt_regs *regs)
  44{
  45        u32 stat;
  46
  47        stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_LOW_OFF);
  48        stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF);
  49        if (stat) {
  50                unsigned int hwirq = 1 + __fls(stat);
  51                handle_IRQ(hwirq, regs);
  52                return;
  53        }
  54        stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_HIGH_OFF);
  55        stat &= readl_relaxed(dove_irq_base + IRQ_MASK_HIGH_OFF);
  56        if (stat) {
  57                unsigned int hwirq = 33 + __fls(stat);
  58                handle_IRQ(hwirq, regs);
  59                return;
  60        }
  61}
  62
  63void __init dove_init_irq(void)
  64{
  65        orion_irq_init(1, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
  66        orion_irq_init(33, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
  67
  68        set_handle_irq(dove_legacy_handle_irq);
  69
  70        /*
  71         * Initialize gpiolib for GPIOs 0-71.
  72         */
  73        orion_gpio_init(NULL, 0, 32, DOVE_GPIO_LO_VIRT_BASE, 0,
  74                        IRQ_DOVE_GPIO_START, gpio0_irqs);
  75
  76        orion_gpio_init(NULL, 32, 32, DOVE_GPIO_HI_VIRT_BASE, 0,
  77                        IRQ_DOVE_GPIO_START + 32, gpio1_irqs);
  78
  79        orion_gpio_init(NULL, 64, 8, DOVE_GPIO2_VIRT_BASE, 0,
  80                        IRQ_DOVE_GPIO_START + 64, gpio2_irqs);
  81}
  82