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
  21 #include <asm/prom.h>
  22
  23 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
  24 {
  25         struct of_irq oirq;
  26
  27         if (of_irq_map_one(dev, index, &oirq))
  28                 return NO_IRQ;
  29
  30         return oirq.specifier[0];
  31 }
  32 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
  33
  34 static u32 concurrent_irq;
  35
  36 void __irq_entry do_IRQ(struct pt_regs *regs)
  37 {
  38         unsigned int irq;
  39         struct pt_regs *old_regs = set_irq_regs(regs);
  40
  41         irq_enter();
  42         irq = get_irq(regs);
  43 next_irq:
  44         BUG_ON(irq == -1U);
  45         generic_handle_irq(irq);
  46
  47         irq = get_irq(regs);
  48         if (irq != -1U) {
  49                 pr_debug("next irq: %d\n", irq);
  50                 ++concurrent_irq;
  51                 goto next_irq;
  52         }
  53
  54         irq_exit();
  55         set_irq_regs(old_regs);
  56 }
  57
  58 int show_interrupts(struct seq_file *p, void *v)
  59 {
  60         int i = *(loff_t *) v, j;
  61         struct irqaction *action;
  62         unsigned long flags;
  63
  64         if (i == 0) {
  65                 seq_printf(p, "         ");
  66                 for_each_online_cpu(j)
  67                         seq_printf(p, "CPU%-8d", j);
  68                 seq_putc(p, '\n');
  69         }
  70
  71         if (i < nr_irq) {
  72                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
  73                 action = irq_desc[i].action;
  74                 if (!action)
  75                         goto skip;
  76                 seq_printf(p, "%3d: ", i);
  77 #ifndef CONFIG_SMP
  78                 seq_printf(p, "%10u ", kstat_irqs(i));
  79 #else
  80                 for_each_online_cpu(j)
  81                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  82 #endif
  83                 seq_printf(p, " %8s", irq_desc[i].status &
  84                                         IRQ_LEVEL ? "level" : "edge");
  85                 seq_printf(p, " %8s", irq_desc[i].chip->name);
  86                 seq_printf(p, "  %s", action->name);
  87
  88                 for (action = action->next; action; action = action->next)
  89                         seq_printf(p, ", %s", action->name);
  90
  91                 seq_putc(p, '\n');
  92 skip:
  93                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  94         }
  95         return 0;
  96 }
  97
  98 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
  99   intc without any cascades or any connection that's why mapping is 1:1 */
 100 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
 101 {
 102         return hwirq;
 103 }
 104 EXPORT_SYMBOL_GPL(irq_create_mapping);
 105
 106 unsigned int irq_create_of_mapping(struct device_node *controller,
 107                                         u32 *intspec, unsigned int intsize)
 108 {
 109         return intspec[0];
 110 }
 111 EXPORT_SYMBOL_GPL(irq_create_of_mapping);