ACPI: PCC: Add PCC shared memory region command and status bitfields

Define the common macros to use when referring to various bitfields in
the PCC generic communications channel command and status fields.

Currently different drivers that need to use these bitfields have defined
these locally. This common macro is intended to consolidate and replace
those.

Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20230927-pcc_defines-v2-1-0b8ffeaef2e5@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
index 73e806fe7ce70795d79e3fd237844a3baa5fdcf6..9b373d172a77604cb65c4b43eb35acaa5a18344f 100644 (file)
--- a/include/acpi/pcc.h
+++ b/include/acpi/pcc.h
@@ -18,7 +18,20 @@ struct pcc_mbox_chan {
        u16 min_turnaround_time;
 };
 
+/* Generic Communications Channel Shared Memory Region */
+#define PCC_SIGNATURE                  0x50434300
+/* Generic Communications Channel Command Field */
+#define PCC_CMD_GENERATE_DB_INTR       BIT(15)
+/* Generic Communications Channel Status Field */
+#define PCC_STATUS_CMD_COMPLETE                BIT(0)
+#define PCC_STATUS_SCI_DOORBELL                BIT(1)
+#define PCC_STATUS_ERROR               BIT(2)
+#define PCC_STATUS_PLATFORM_NOTIFY     BIT(3)
+/* Initiator Responder Communications Channel Flags */
+#define PCC_CMD_COMPLETION_NOTIFY      BIT(0)
+
 #define MAX_PCC_SUBSPACES      256
+
 #ifdef CONFIG_PCC
 extern struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);