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 static u32 concurrent_irq;
  34
  35 void 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);
  42 next_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
  57 int 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                 raw_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');
  91 skip:
  92                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  93         }
  94         return 0;
  95 }
  96
  97 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
  98   intc without any cascades or any connection that's why mapping is 1:1 */
  99 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
 100 {
 101         return hwirq;
 102 }
 103 EXPORT_SYMBOL_GPL(irq_create_mapping);
 104
 105 unsigned int irq_create_of_mapping(struct device_node *controller,
 106                                         u32 *intspec, unsigned int intsize)
 107 {
 108         return intspec[0];
 109 }
 110 EXPORT_SYMBOL_GPL(irq_create_of_mapping);