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/kernel.h>
  13#include <linux/hardirq.h>
  14#include <linux/interrupt.h>
  15#include <linux/irqflags.h>
  16#include <linux/seq_file.h>
  17#include <linux/kernel_stat.h>
  18#include <linux/irq.h>
  19
  20#include <asm/prom.h>
  21
  22unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
  23{
  24        struct of_irq oirq;
  25
  26        if (of_irq_map_one(dev, index, &oirq))
  27                return NO_IRQ;
  28
  29        return oirq.specifier[0];
  30}
  31EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
  32
  33static u32 concurrent_irq;
  34
  35void do_IRQ(struct pt_regs *regs)
  36{
  37        unsigned int irq;
  38        struct pt_regs *old_regs = set_irq_regs(regs);
  39
  40        irq_enter();
  41        irq = get_irq(regs);
  42next_irq:
  43        BUG_ON(irq == -1U);
  44        generic_handle_irq(irq);
  45
  46        irq = get_irq(regs);
  47        if (irq != -1U) {
  48                pr_debug("next irq: %d\n", irq);
  49                ++concurrent_irq;
  50                goto next_irq;
  51        }
  52
  53        irq_exit();
  54        set_irq_regs(old_regs);
  55}
  56
  57int show_interrupts(struct seq_file *p, void *v)
  58{
  59        int i = *(loff_t *) v, j;
  60        struct irqaction *action;
  61        unsigned long flags;
  62
  63        if (i == 0) {
  64                seq_printf(p, "         ");
  65                for_each_online_cpu(j)
  66                        seq_printf(p, "CPU%-8d", j);
  67                seq_putc(p, '\n');
  68        }
  69
  70        if (i < nr_irq) {
  71                spin_lock_irqsave(&irq_desc[i].lock, flags);
  72                action = irq_desc[i].action;
  73                if (!action)
  74                        goto skip;
  75                seq_printf(p, "%3d: ", i);
  76#ifndef CONFIG_SMP
  77                seq_printf(p, "%10u ", kstat_irqs(i));
  78#else
  79                for_each_online_cpu(j)
  80                        seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  81#endif
  82                seq_printf(p, " %8s", irq_desc[i].status &
  83                                        IRQ_LEVEL ? "level" : "edge");
  84                seq_printf(p, " %8s", irq_desc[i].chip->name);
  85                seq_printf(p, "  %s", action->name);
  86
  87                for (action = action->next; action; action = action->next)
  88                        seq_printf(p, ", %s", action->name);
  89
  90                seq_putc(p, '\n');
  91skip:
  92                spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  93        }
  94        return 0;
  95}
  96