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 #include <linux/gpio.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/pci.h>
  14 #include <linux/irq.h>
  15 #include <mach/bridge-regs.h>
  16 #include <plat/irq.h>
  17 #include "common.h"
  18
  19 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
  20 {
  21         BUG_ON(irq < IRQ_MV78XX0_GPIO_0_7 || irq > IRQ_MV78XX0_GPIO_24_31);
  22
  23         orion_gpio_irq_handler((irq - IRQ_MV78XX0_GPIO_0_7) << 3);
  24 }
  25
  26 void __init mv78xx0_init_irq(void)
  27 {
  28         orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
  29         orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
  30         orion_irq_init(64, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_ERR_OFF));
  31
  32         /*
  33          * Initialize gpiolib for GPIOs 0-31.  (The GPIO interrupt mask
  34          * registers for core #1 are at an offset of 0x18 from those of
  35          * core #0.)
  36          */
  37         orion_gpio_init(0, 32, GPIO_VIRT_BASE,
  38                         mv78xx0_core_index() ? 0x18 : 0,
  39                         IRQ_MV78XX0_GPIO_START);
  40         irq_set_chained_handler(IRQ_MV78XX0_GPIO_0_7, gpio_irq_handler);
  41         irq_set_chained_handler(IRQ_MV78XX0_GPIO_8_15, gpio_irq_handler);
  42         irq_set_chained_handler(IRQ_MV78XX0_GPIO_16_23, gpio_irq_handler);
  43         irq_set_chained_handler(IRQ_MV78XX0_GPIO_24_31, gpio_irq_handler);
  44 }