linux/arch/arm/mach-dove/irq.c
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   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
  15#include <plat/irq.h>
  16#include <plat/orion-gpio.h>
  17
  18#include "pm.h"
  19#include "bridge-regs.h"
  20#include "common.h"
  21
  22static int __initdata gpio0_irqs[4] = {
  23        IRQ_DOVE_GPIO_0_7,
  24        IRQ_DOVE_GPIO_8_15,
  25        IRQ_DOVE_GPIO_16_23,
  26        IRQ_DOVE_GPIO_24_31,
  27};
  28
  29static int __initdata gpio1_irqs[4] = {
  30        IRQ_DOVE_HIGH_GPIO,
  31        0,
  32        0,
  33        0,
  34};
  35
  36static int __initdata gpio2_irqs[4] = {
  37        0,
  38        0,
  39        0,
  40        0,
  41};
  42
  43static void __iomem *dove_irq_base = IRQ_VIRT_BASE;
  44
  45static asmlinkage void
  46__exception_irq_entry dove_legacy_handle_irq(struct pt_regs *regs)
  47{
  48        u32 stat;
  49
  50        stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_LOW_OFF);
  51        stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF);
  52        if (stat) {
  53                unsigned int hwirq = 1 + __fls(stat);
  54                handle_IRQ(hwirq, regs);
  55                return;
  56        }
  57        stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_HIGH_OFF);
  58        stat &= readl_relaxed(dove_irq_base + IRQ_MASK_HIGH_OFF);
  59        if (stat) {
  60                unsigned int hwirq = 33 + __fls(stat);
  61                handle_IRQ(hwirq, regs);
  62                return;
  63        }
  64}
  65
  66void __init dove_init_irq(void)
  67{
  68        orion_irq_init(1, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
  69        orion_irq_init(33, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
  70
  71        set_handle_irq(dove_legacy_handle_irq);
  72
  73        /*
  74         * Initialize gpiolib for GPIOs 0-71.
  75         */
  76        orion_gpio_init(NULL, 0, 32, DOVE_GPIO_LO_VIRT_BASE, 0,
  77                        IRQ_DOVE_GPIO_START, gpio0_irqs);
  78
  79        orion_gpio_init(NULL, 32, 32, DOVE_GPIO_HI_VIRT_BASE, 0,
  80                        IRQ_DOVE_GPIO_START + 32, gpio1_irqs);
  81
  82        orion_gpio_init(NULL, 64, 8, DOVE_GPIO2_VIRT_BASE, 0,
  83                        IRQ_DOVE_GPIO_START + 64, gpio2_irqs);
  84}
  85
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