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
  24 static u32 concurrent_irq;
  25
  26 void __irq_entry do_IRQ(struct pt_regs *regs)
  27 {
  28         unsigned int irq;
  29         struct pt_regs *old_regs = set_irq_regs(regs);
  30
  31         irq_enter();
  32         irq = get_irq(regs);
  33 next_irq:
  34         BUG_ON(irq == -1U);
  35         generic_handle_irq(irq);
  36
  37         irq = get_irq(regs);
  38         if (irq != -1U) {
  39                 pr_debug("next irq: %d\n", irq);
  40                 ++concurrent_irq;
  41                 goto next_irq;
  42         }
  43
  44         irq_exit();
  45         set_irq_regs(old_regs);
  46 }
  47
  48 int show_interrupts(struct seq_file *p, void *v)
  49 {
  50         int i = *(loff_t *) v, j;
  51         struct irqaction *action;
  52         unsigned long flags;
  53
  54         if (i == 0) {
  55                 seq_printf(p, "         ");
  56                 for_each_online_cpu(j)
  57                         seq_printf(p, "CPU%-8d", j);
  58                 seq_putc(p, '\n');
  59         }
  60
  61         if (i < nr_irq) {
  62                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
  63                 action = irq_desc[i].action;
  64                 if (!action)
  65                         goto skip;
  66                 seq_printf(p, "%3d: ", i);
  67 #ifndef CONFIG_SMP
  68                 seq_printf(p, "%10u ", kstat_irqs(i));
  69 #else
  70                 for_each_online_cpu(j)
  71                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  72 #endif
  73                 seq_printf(p, " %8s", irq_desc[i].status &
  74                                         IRQ_LEVEL ? "level" : "edge");
  75                 seq_printf(p, " %8s", irq_desc[i].chip->name);
  76                 seq_printf(p, "  %s", action->name);
  77
  78                 for (action = action->next; action; action = action->next)
  79                         seq_printf(p, ", %s", action->name);
  80
  81                 seq_putc(p, '\n');
  82 skip:
  83                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  84         }
  85         return 0;
  86 }
  87
  88 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
  89   intc without any cascades or any connection that's why mapping is 1:1 */
  90 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
  91 {
  92         return hwirq;
  93 }
  94 EXPORT_SYMBOL_GPL(irq_create_mapping);
  95
  96 unsigned int irq_create_of_mapping(struct device_node *controller,
  97                                    const u32 *intspec, unsigned int intsize)
  98 {
  99         return intspec[0];
 100 }
 101 EXPORT_SYMBOL_GPL(irq_create_of_mapping);