1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/sh/intc/dynamic.c b/drivers/sh/intc/dynamic.c
new file mode 100644
index 00000000000..a3677c9dfe3
--- /dev/null
+++ b/drivers/sh/intc/dynamic.c
@@ -0,0 +1,64 @@
+/*
+ * Dynamic IRQ management
+ *
+ * Copyright (C) 2010  Paul Mundt
+ *
+ * Modelled after arch/x86/kernel/apic/io_apic.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#define pr_fmt(fmt) "intc: " fmt
+
+#include <linux/irq.h>
+#include <linux/bitmap.h>
+#include <linux/spinlock.h>
+#include "internals.h" /* only for activate_irq() damage.. */
+
+/*
+ * The IRQ bitmap provides a global map of bound IRQ vectors for a
+ * given platform. Allocation of IRQs are either static through the CPU
+ * vector map, or dynamic in the case of board mux vectors or MSI.
+ *
+ * As this is a central point for all IRQ controllers on the system,
+ * each of the available sources are mapped out here. This combined with
+ * sparseirq makes it quite trivial to keep the vector map tightly packed
+ * when dynamically creating IRQs, as well as tying in to otherwise
+ * unused irq_desc positions in the sparse array.
+ */
+
+/*
+ * Dynamic IRQ allocation and deallocation
+ */
+unsigned int create_irq_nr(unsigned int irq_want, int node)
+{
+        int irq = irq_alloc_desc_at(irq_want, node);
+        if (irq < 0)
+                return 0;
+
+        activate_irq(irq);
+        return irq;
+}
+
+int create_irq(void)
+{
+        int irq = irq_alloc_desc(numa_node_id());
+        if (irq >= 0)
+                activate_irq(irq);
+
+        return irq;
+}
+
+void destroy_irq(unsigned int irq)
+{
+        irq_free_desc(irq);
+}
+
+void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs)
+{
+        int i;
+
+        for (i = 0; i < nr_vecs; i++)
+                irq_reserve_irq(evt2irq(vectors[i].vect));
+}