firmware: arm_scmi: Add new protocol handle core transfer ops

Add new core SCMI transfer operations based on protocol handles to
enable protocols to builds and send their own protocol specific messages.

Keep old original scmi_xfer_ operations interface as wrappers around the
new interface in order to let coexist old and new interfaces to ease
protocol by protocol migration.

In order to support such migration the above wrappers and some
additional transient code is also introduced in this commit. It will be
later removed as a whole once the full migration of protocols and SCMI
drivers will have been completed.

Link: https://lore.kernel.org/r/20210316124903.35011-9-cristian.marussi@arm.comTested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/common.h

@@ -19,6 +19,8 @@
 
 #include <asm/unaligned.h>
 
+#include "notify.h"
+
 #define PROTOCOL_REV_MINOR_MASK	GENMASK(15, 0)
 #define PROTOCOL_REV_MAJOR_MASK	GENMASK(31, 16)
 #define PROTOCOL_REV_MAJOR(x)	(u16)(FIELD_GET(PROTOCOL_REV_MAJOR_MASK, (x)))
@@ -179,6 +181,11 @@ struct scmi_protocol_handle {
 	void *(*get_priv)(const struct scmi_protocol_handle *ph);
 };
 
+const struct scmi_protocol_handle *
+scmi_map_protocol_handle(const struct scmi_handle *handle, u8 prot_id);
+
+struct scmi_handle *scmi_map_scmi_handle(const struct scmi_protocol_handle *ph);
+
 /**
  * struct scmi_xfer_ops  - References to the core SCMI xfer operations.
  * @version_get: Get this version protocol.
@@ -217,6 +224,7 @@ void scmi_setup_protocol_implemented(const struct scmi_handle *handle,
 
 int scmi_base_protocol_init(struct scmi_handle *h);
 typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
+typedef int (*scmi_prot_init_ph_fn_t)(const struct scmi_protocol_handle *);
 
 /**
  * struct scmi_protocol  - Protocol descriptor
@@ -231,8 +239,8 @@ typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *);
 struct scmi_protocol {
 	const u8				id;
 	const scmi_prot_init_fn_t		init;
-	const scmi_prot_init_fn_t		instance_init;
-	const scmi_prot_init_fn_t		instance_deinit;
+	const scmi_prot_init_ph_fn_t		instance_init;
+	const scmi_prot_init_ph_fn_t		instance_deinit;
 	const void				*ops;
 	const struct scmi_protocol_events	*events;
 };