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 == -1U);
  37         generic_handle_irq(irq);
  38
  39         irq = get_irq(regs);
  40         if (irq != -1U) {
  41                 pr_debug("next irq: %d\n", irq);
  42                 ++concurrent_irq;
  43                 goto next_irq;
  44         }
  45
  46         irq_exit();
  47         set_irq_regs(old_regs);
  48         trace_hardirqs_on();
  49 }
  50
  51 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
  52   intc without any cascades or any connection that's why mapping is 1:1 */
  53 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
  54 {
  55         return hwirq;
  56 }
  57 EXPORT_SYMBOL_GPL(irq_create_mapping);
  58
  59 unsigned int irq_create_of_mapping(struct device_node *controller,
  60                                    const u32 *intspec, unsigned int intsize)
  61 {
  62         return intspec[0];
  63 }
  64 EXPORT_SYMBOL_GPL(irq_create_of_mapping);