powerpc/xics: Add ICP OPAL backend
This adds a new XICS backend that uses OPAL calls, which can be
used when we don't have native support for the platform interrupt
controller.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/include/asm/xics.h b/arch/powerpc/include/asm/xics.h
index 04ef3ae..f5f729c 100644
--- a/arch/powerpc/include/asm/xics.h
+++ b/arch/powerpc/include/asm/xics.h
@@ -42,6 +42,12 @@
static inline int icp_hv_init(void) { return -ENODEV; }
#endif
+#ifdef CONFIG_PPC_POWERNV
+extern int icp_opal_init(void);
+#else
+static inline int icp_opal_init(void) { return -ENODEV; }
+#endif
+
/* ICP ops */
struct icp_ops {
unsigned int (*get_irq)(void);