1 files changed, 47 insertions, 13 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index c2b84c64db20..2fc87862146c 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -7,7 +7,6 @@
  *    Copyright (C) 1996-2001 Cort Dougan
  *  Adapted for Power Macintosh by Paul Mackerras
  *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
- *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -337,7 +336,8 @@ void do_IRQ(struct pt_regs *regs)
 
 void __init init_IRQ(void)
 {
-        ppc_md.init_IRQ();
+        if (ppc_md.init_IRQ)
+                ppc_md.init_IRQ();
 #ifdef CONFIG_PPC64
         irq_ctx_init();
 #endif
@@ -597,6 +597,49 @@ static void irq_radix_rdunlock(unsigned long flags)
         local_irq_restore(flags);
 }
 
+static int irq_setup_virq(struct irq_host *host, unsigned int virq,
+                            irq_hw_number_t hwirq)
+{
+        /* Clear IRQ_NOREQUEST flag */
+        get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
+
+        /* map it */
+        smp_wmb();
+        irq_map[virq].hwirq = hwirq;
+        smp_mb();
+
+        if (host->ops->map(host, virq, hwirq)) {
+                pr_debug("irq: -> mapping failed, freeing\n");
+                irq_free_virt(virq, 1);
+                return -1;
+        }
+
+        return 0;
+}
+
+unsigned int irq_create_direct_mapping(struct irq_host *host)
+{
+        unsigned int virq;
+
+        if (host == NULL)
+                host = irq_default_host;
+
+        BUG_ON(host == NULL);
+        WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
+
+        virq = irq_alloc_virt(host, 1, 0);
+        if (virq == NO_IRQ) {
+                pr_debug("irq: create_direct virq allocation failed\n");
+                return NO_IRQ;
+        }
+
+        pr_debug("irq: create_direct obtained virq %d\n", virq);
+
+        if (irq_setup_virq(host, virq, virq))
+                return NO_IRQ;
+
+        return virq;
+}
 
 unsigned int irq_create_mapping(struct irq_host *host,
                                 irq_hw_number_t hwirq)
@@ -645,18 +688,9 @@ unsigned int irq_create_mapping(struct irq_host *host,
         }
         pr_debug("irq: -> obtained virq %d\n", virq);
 
-        /* Clear IRQ_NOREQUEST flag */
-        get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
-
-        /* map it */
-        smp_wmb();
-        irq_map[virq].hwirq = hwirq;
-        smp_mb();
-        if (host->ops->map(host, virq, hwirq)) {
-                pr_debug("irq: -> mapping failed, freeing\n");
-                irq_free_virt(virq, 1);
+        if (irq_setup_virq(host, virq, hwirq))
                 return NO_IRQ;
-        }
+
         return virq;
 }
 EXPORT_SYMBOL_GPL(irq_create_mapping);