powerpc/powernv: Add OPAL ICS backend

OPAL handles HW access to the various ICS or equivalent chips
for us (with the exception of p5ioc2 based HEA which uses a

different backend) similarily to what RTAS does on pSeries.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 6 deletions

diff --git a/arch/powerpc/sysdev/xics/xics-common.c b/arch/powerpc/sysdev/xics/xics-common.c
index 445c5a01b766..3d93a8ded0f8 100644
--- a/arch/powerpc/sysdev/xics/xics-common.c
+++ b/arch/powerpc/sysdev/xics/xics-common.c
@@ -409,14 +409,10 @@ void __init xics_init(void)
         int rc = -1;
 
         /* Fist locate ICP */
-#ifdef CONFIG_PPC_ICP_HV
         if (firmware_has_feature(FW_FEATURE_LPAR))
                 rc = icp_hv_init();
-#endif
-#ifdef CONFIG_PPC_ICP_NATIVE
         if (rc < 0)
                 rc = icp_native_init();
-#endif
         if (rc < 0) {
                 pr_warning("XICS: Cannot find a Presentation Controller !\n");
                 return;
@@ -429,9 +425,9 @@ void __init xics_init(void)
         xics_ipi_chip.irq_eoi = icp_ops->eoi;
 
         /* Now locate ICS */
-#ifdef CONFIG_PPC_ICS_RTAS
         rc = ics_rtas_init();
-#endif
+        if (rc < 0)
+                rc = ics_opal_init();
         if (rc < 0)
                 pr_warning("XICS: Cannot find a Source Controller !\n");