LXR linux/arch/arm/plat-orion/irq.c

   1/*
   2 * arch/arm/plat-orion/irq.c
   3 *
   4 * Marvell Orion SoC 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/irqdomain.h>
  15#include <linux/io.h>
  16#include <linux/of_address.h>
  17#include <linux/of_irq.h>
  18#include <plat/irq.h>
  19#include <plat/orion-gpio.h>
  20
  21void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
  22{
  23        struct irq_chip_generic *gc;
  24        struct irq_chip_type *ct;
  25
  26        /*
  27         * Mask all interrupts initially.
  28         */
  29        writel(0, maskaddr);
  30
  31        gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr,
  32                                    handle_level_irq);
  33        ct = gc->chip_types;
  34        ct->chip.irq_mask = irq_gc_mask_clr_bit;
  35        ct->chip.irq_unmask = irq_gc_mask_set_bit;
  36        irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
  37                               IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
  38}
  39
  40#ifdef CONFIG_OF
  41static int __init orion_add_irq_domain(struct device_node *np,
  42                                       struct device_node *interrupt_parent)
  43{
  44        int i = 0;
  45        void __iomem *base;
  46
  47        do {
  48                base = of_iomap(np, i);
  49                if (base) {
  50                        orion_irq_init(i * 32, base);
  51                        i++;
  52                }
  53        } while (base);
  54
  55        irq_domain_add_legacy(np, i * 32, 0, 0,
  56                              &irq_domain_simple_ops, NULL);
  57        return 0;
  58}
  59
  60static const struct of_device_id orion_irq_match[] = {
  61        { .compatible = "marvell,orion-intc",
  62          .data = orion_add_irq_domain, },
  63        {},
  64};
  65
  66void __init orion_dt_init_irq(void)
  67{
  68        of_irq_init(orion_irq_match);
  69}
  70#endif
  71