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
  19 static 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
  26 static int __initdata gpio1_irqs[4] = {
  27         IRQ_DOVE_HIGH_GPIO,
  28         0,
  29         0,
  30         0,
  31 };
  32
  33 static int __initdata gpio2_irqs[4] = {
  34         0,
  35         0,
  36         0,
  37         0,
  38 };
  39
  40 static void __iomem *dove_irq_base = IRQ_VIRT_BASE;
  41
  42 static 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
  63 void __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 }