release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-mv78xx0/irq.c

   1 /*
   2  * arch/arm/mach-mv78xx0/irq.c
   3  *
   4  * MV78xx0 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/pci.h>
  14 #include <linux/irq.h>
  15 #include <asm/gpio.h>
  16 #include <mach/bridge-regs.h>
  17 #include <plat/irq.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_MV78XX0_GPIO_0_7 || irq > IRQ_MV78XX0_GPIO_24_31);
  23
  24         orion_gpio_irq_handler((irq - IRQ_MV78XX0_GPIO_0_7) << 3);
  25 }
  26
  27 void __init mv78xx0_init_irq(void)
  28 {
  29         int i;
  30
  31         /* Initialize gpiolib. */
  32         orion_gpio_init();
  33
  34         orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
  35         orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
  36         orion_irq_init(64, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_ERR_OFF));
  37
  38         /*
  39          * Mask and clear GPIO IRQ interrupts.
  40          */
  41         writel(0, GPIO_LEVEL_MASK(0));
  42         writel(0, GPIO_EDGE_MASK(0));
  43         writel(0, GPIO_EDGE_CAUSE(0));
  44
  45         for (i = IRQ_MV78XX0_GPIO_START; i < NR_IRQS; i++) {
  46                 set_irq_chip(i, &orion_gpio_irq_chip);
  47                 set_irq_handler(i, handle_level_irq);
  48                 irq_desc[i].status |= IRQ_LEVEL;
  49                 set_irq_flags(i, IRQF_VALID);
  50         }
  51         set_irq_chained_handler(IRQ_MV78XX0_GPIO_0_7, gpio_irq_handler);
  52         set_irq_chained_handler(IRQ_MV78XX0_GPIO_8_15, gpio_irq_handler);
  53         set_irq_chained_handler(IRQ_MV78XX0_GPIO_16_23, gpio_irq_handler);
  54         set_irq_chained_handler(IRQ_MV78XX0_GPIO_24_31, gpio_irq_handler);
  55 }