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 #include <linux/export.h>
  22
  23 #include <asm/prom.h>
  24
  25 static u32 concurrent_irq;
  26
  27 void __irq_entry do_IRQ(struct pt_regs *regs)
  28 {
  29         unsigned int irq;
  30         struct pt_regs *old_regs = set_irq_regs(regs);
  31         trace_hardirqs_off();
  32
  33         irq_enter();
  34         irq = get_irq(regs);
  35 next_irq:
  36         BUG_ON(!irq);
  37         /* Substract 1 because of get_irq */
  38         generic_handle_irq(irq + IRQ_OFFSET - NO_IRQ_OFFSET);
  39
  40         irq = get_irq(regs);
  41         if (irq) {
  42                 pr_debug("next irq: %d\n", irq);
  43                 ++concurrent_irq;
  44                 goto next_irq;
  45         }
  46
  47         irq_exit();
  48         set_irq_regs(old_regs);
  49         trace_hardirqs_on();
  50 }
  51
  52 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
  53   intc without any cascades or any connection that's why mapping is 1:1 */
  54 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
  55 {
  56         return hwirq + IRQ_OFFSET;
  57 }
  58 EXPORT_SYMBOL_GPL(irq_create_mapping);
  59
  60 unsigned int irq_create_of_mapping(struct device_node *controller,
  61                                    const u32 *intspec, unsigned int intsize)
  62 {
  63         return intspec[0] + IRQ_OFFSET;
  64 }
  65 EXPORT_SYMBOL_GPL(irq_create_of_mapping);