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         trace_hardirqs_off();
  41
  42         irq_enter();
  43         irq = get_irq(regs);
  44 next_irq:
  45         BUG_ON(irq == -1U);
  46         generic_handle_irq(irq);
  47
  48         irq = get_irq(regs);
  49         if (irq != -1U) {
  50                 pr_debug("next irq: %d\n", irq);
  51                 ++concurrent_irq;
  52                 goto next_irq;
  53         }
  54
  55         irq_exit();
  56         set_irq_regs(old_regs);
  57         trace_hardirqs_on();
  58 }
  59
  60 int show_interrupts(struct seq_file *p, void *v)
  61 {
  62         int i = *(loff_t *) v, j;
  63         struct irqaction *action;
  64         unsigned long flags;
  65
  66         if (i == 0) {
  67                 seq_printf(p, "         ");
  68                 for_each_online_cpu(j)
  69                         seq_printf(p, "CPU%-8d", j);
  70                 seq_putc(p, '\n');
  71         }
  72
  73         if (i < nr_irq) {
  74                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
  75                 action = irq_desc[i].action;
  76                 if (!action)
  77                         goto skip;
  78                 seq_printf(p, "%3d: ", i);
  79 #ifndef CONFIG_SMP
  80                 seq_printf(p, "%10u ", kstat_irqs(i));
  81 #else
  82                 for_each_online_cpu(j)
  83                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  84 #endif
  85                 seq_printf(p, " %8s", irq_desc[i].status &
  86                                         IRQ_LEVEL ? "level" : "edge");
  87                 seq_printf(p, " %8s", irq_desc[i].chip->name);
  88                 seq_printf(p, "  %s", action->name);
  89
  90                 for (action = action->next; action; action = action->next)
  91                         seq_printf(p, ", %s", action->name);
  92
  93                 seq_putc(p, '\n');
  94 skip:
  95                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  96         }
  97         return 0;
  98 }
  99
 100 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
 101   intc without any cascades or any connection that's why mapping is 1:1 */
 102 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
 103 {
 104         return hwirq;
 105 }
 106 EXPORT_SYMBOL_GPL(irq_create_mapping);
 107
 108 unsigned int irq_create_of_mapping(struct device_node *controller,
 109                                         u32 *intspec, unsigned int intsize)
 110 {
 111         return intspec[0];
 112 }
 113 EXPORT_SYMBOL_GPL(irq_create_of_mapping);