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 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
  51   intc without any cascades or any connection that's why mapping is 1:1 */
  52 unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
  53 {
  54         return hwirq;
  55 }
  56 EXPORT_SYMBOL_GPL(irq_create_mapping);
  57
  58 unsigned int irq_create_of_mapping(struct device_node *controller,
  59                                    const u32 *intspec, unsigned int intsize)
  60 {
  61         return intspec[0];
  62 }
  63 EXPORT_SYMBOL_GPL(irq_create_of_mapping);