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 <asm/exception.h>
  19#include <plat/irq.h>
  20#include <plat/orion-gpio.h>
  21
  22void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
  23{
  24        struct irq_chip_generic *gc;
  25        struct irq_chip_type *ct;
  26
  27        /*
  28         * Mask all interrupts initially.
  29         */
  30        writel(0, maskaddr);
  31
  32        gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr,
  33                                    handle_level_irq);
  34        ct = gc->chip_types;
  35        ct->chip.irq_mask = irq_gc_mask_clr_bit;
  36        ct->chip.irq_unmask = irq_gc_mask_set_bit;
  37        irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
  38                               IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
  39}
  40