powerpc/powernv: Add XICS emulation APIs

OPAL provides an emulated XICS interrupt controller to
use as a fallback on newer processors that don't have a
XICS. It's meant as a way to provide backward compatibility
with future processors. Add the corresponding interfaces.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/opal-api.h

@@ -162,7 +162,11 @@
 #define OPAL_PCI_GET_PRESENCE_STATE		119
 #define OPAL_PCI_GET_POWER_STATE		120
 #define OPAL_PCI_SET_POWER_STATE		121
-#define OPAL_LAST				121
+#define OPAL_INT_GET_XIRR			122
+#define	OPAL_INT_SET_CPPR			123
+#define OPAL_INT_EOI				124
+#define OPAL_INT_SET_MFRR			125
+#define OPAL_LAST				125
 
 /* Device tree flags */
 

arch/powerpc/include/asm/opal.h

@@ -218,6 +218,11 @@ int64_t opal_pci_set_power_state(uint64_t async_token, uint64_t id,
 				 uint64_t data);
 int64_t opal_pci_poll2(uint64_t id, uint64_t data);
 
+int64_t opal_int_get_xirr(uint32_t *out_xirr, bool just_poll);
+int64_t opal_int_set_cppr(uint8_t cppr);
+int64_t opal_int_eoi(uint32_t xirr);
+int64_t opal_int_set_mfrr(uint32_t cpu, uint8_t mfrr);
+
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
 				   int depth, void *data);

arch/powerpc/platforms/powernv/opal-wrappers.S

@@ -307,3 +307,7 @@ OPAL_CALL(opal_get_device_tree,			OPAL_GET_DEVICE_TREE);
 OPAL_CALL(opal_pci_get_presence_state,		OPAL_PCI_GET_PRESENCE_STATE);
 OPAL_CALL(opal_pci_get_power_state,		OPAL_PCI_GET_POWER_STATE);
 OPAL_CALL(opal_pci_set_power_state,		OPAL_PCI_SET_POWER_STATE);
+OPAL_CALL(opal_int_get_xirr,			OPAL_INT_GET_XIRR);
+OPAL_CALL(opal_int_set_cppr,			OPAL_INT_SET_CPPR);
+OPAL_CALL(opal_int_eoi,				OPAL_INT_EOI);
+OPAL_CALL(opal_int_set_mfrr,			OPAL_INT_SET_MFRR);