arch/arm/mach-kirkwood/irq.c

   1 /*
   2  * arch/arm/mach-kirkwood/irq.c
   3  *
   4  * Kirkwood 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
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/io.h>
  15 #include <mach/bridge-regs.h>
  16 #include <plat/irq.h>
  17 #include <asm/gpio.h>
  18 #include "common.h"
  19
  20 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
  21 {
  22         BUG_ON(irq < IRQ_KIRKWOOD_GPIO_LOW_0_7);
  23         BUG_ON(irq > IRQ_KIRKWOOD_GPIO_HIGH_16_23);
  24
  25         orion_gpio_irq_handler((irq - IRQ_KIRKWOOD_GPIO_LOW_0_7) << 3);
  26 }
  27
  28 void __init kirkwood_init_irq(void)
  29 {
  30         orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
  31         orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
  32
  33         /*
  34          * Initialize gpiolib for GPIOs 0-49.
  35          */
  36         orion_gpio_init(0, 32, GPIO_LOW_VIRT_BASE, 0,
  37                         IRQ_KIRKWOOD_GPIO_START);
  38         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_0_7, gpio_irq_handler);
  39         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_8_15, gpio_irq_handler);
  40         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_16_23, gpio_irq_handler);
  41         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_24_31, gpio_irq_handler);
  42
  43         orion_gpio_init(32, 18, GPIO_HIGH_VIRT_BASE, 0,
  44                         IRQ_KIRKWOOD_GPIO_START + 32);
  45         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_0_7, gpio_irq_handler);
  46         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_8_15, gpio_irq_handler);
  47         irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_16_23,
  48                                 gpio_irq_handler);
  49 }