LXR linux/arch/microblaze/kernel/irq.c

   1/*
   2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2007-2009 PetaLogix
   4 * Copyright (C) 2006 Atmark Techno, Inc.
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License. See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/init.h>
  12#include <linux/ftrace.h>
  13#include <linux/kernel.h>
  14#include <linux/hardirq.h>
  15#include <linux/interrupt.h>
  16#include <linux/irqflags.h>
  17#include <linux/seq_file.h>
  18#include <linux/kernel_stat.h>
  19#include <linux/irq.h>
  20#include <linux/of_irq.h>
  21
  22#include <asm/prom.h>
  23
  24static u32 concurrent_irq;
  25
  26void __irq_entry do_IRQ(struct pt_regs *regs)
  27{
  28        unsigned int irq;
  29        struct pt_regs *old_regs = set_irq_regs(regs);
  30        trace_hardirqs_off();
  31
  32        irq_enter();
  33        irq = get_irq(regs);
  34next_irq:
  35        BUG_ON(irq == -1U);
  36        generic_handle_irq(irq);
  37
  38        irq = get_irq(regs);
  39        if (irq != -1U) {
  40                pr_debug("next irq: %d\n", irq);
  41                ++concurrent_irq;
  42                goto next_irq;
  43        }
  44
  45        irq_exit();
  46        set_irq_regs(old_regs);
  47        trace_hardirqs_on();
  48}
  49
  50/* MS: There is no any advance mapping mechanism. We are using simple 32bit
  51  intc without any cascades or any connection that's why mapping is 1:1 */
  52unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
  53{
  54        return hwirq;
  55}
  56EXPORT_SYMBOL_GPL(irq_create_mapping);
  57
  58unsigned int irq_create_of_mapping(struct device_node *controller,
  59                                   const u32 *intspec, unsigned int intsize)
  60{
  61        return intspec[0];
  62}
  63EXPORT_SYMBOL_GPL(irq_create_of_mapping);
  64