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
  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
  22 static 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
  29 static int __initdata gpio1_irqs[4] = {
  30         IRQ_DOVE_HIGH_GPIO,
  31         0,
  32         0,
  33         0,
  34 };
  35
  36 static int __initdata gpio2_irqs[4] = {
  37         0,
  38         0,
  39         0,
  40         0,
  41 };
  42
  43 static void __iomem *dove_irq_base = IRQ_VIRT_BASE;
  44
  45 static 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
  66 void __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 }