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
  22 unsigned 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 }
  31 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
  32
  33 /*
  34  * 'what should we do if we get a hw irq event on an illegal vector'.
  35  * each architecture has to answer this themselves.
  36  */
  37 void ack_bad_irq(unsigned int irq)
  38 {
  39         printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
  40 }
  41
  42 static u32 concurrent_irq;
  43
  44 void do_IRQ(struct pt_regs *regs)
  45 {
  46         unsigned int irq;
  47         struct pt_regs *old_regs = set_irq_regs(regs);
  48
  49         irq_enter();
  50         irq = get_irq(regs);
  51 next_irq:
  52         BUG_ON(irq == -1U);
  53         generic_handle_irq(irq);
  54
  55         irq = get_irq(regs);
  56         if (irq != -1U) {
  57                 pr_debug("next irq: %d\n", irq);
  58                 ++concurrent_irq;
  59                 goto next_irq;
  60         }
  61
  62         irq_exit();
  63         set_irq_regs(old_regs);
  64 }
  65
  66 int show_interrupts(struct seq_file *p, void *v)
  67 {
  68         int i = *(loff_t *) v, j;
  69         struct irqaction *action;
  70         unsigned long flags;
  71
  72         if (i == 0) {
  73                 seq_printf(p, "         ");
  74                 for_each_online_cpu(j)
  75                         seq_printf(p, "CPU%-8d", j);
  76                 seq_putc(p, '\n');
  77         }
  78
  79         if (i < nr_irq) {
  80                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  81                 action = irq_desc[i].action;
  82                 if (!action)
  83                         goto skip;
  84                 seq_printf(p, "%3d: ", i);
  85 #ifndef CONFIG_SMP
  86                 seq_printf(p, "%10u ", kstat_irqs(i));
  87 #else
  88                 for_each_online_cpu(j)
  89                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  90 #endif
  91                 seq_printf(p, " %8s", irq_desc[i].status &
  92                                         IRQ_LEVEL ? "level" : "edge");
  93                 seq_printf(p, " %8s", irq_desc[i].chip->name);
  94                 seq_printf(p, "  %s", action->name);
  95
  96                 for (action = action->next; action; action = action->next)
  97                         seq_printf(p, ", %s", action->name);
  98
  99                 seq_putc(p, '\n');
 100 skip:
 101                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 102         }
 103         return 0;
 104 }