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