thunderbolt: Expose make_header() to other files

We will be using this function in files introduced in subsequent
patches. While there the function is renamed to tb_cfg_make_header()
following tb_cfg_get_route().
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: NYehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: NMichael Jamet <michael.jamet@intel.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NAndreas Noever <andreas.noever@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/thunderbolt/ctl.c

@@ -54,17 +54,6 @@ struct tb_ctl {
 
 /* utility functions */
 
-static struct tb_cfg_header make_header(u64 route)
-{
-	struct tb_cfg_header header = {
-		.route_hi = route >> 32,
-		.route_lo = route,
-	};
-	/* check for overflow, route_hi is not 32 bits! */
-	WARN_ON(tb_cfg_get_route(&header) != route);
-	return header;
-}
-
 static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type,
 			u64 route)
 {
@@ -501,7 +490,7 @@ int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
 		 enum tb_cfg_error error)
 {
 	struct cfg_error_pkg pkg = {
-		.header = make_header(route),
+		.header = tb_cfg_make_header(route),
 		.port = port,
 		.error = error,
 	};
@@ -520,7 +509,7 @@ struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
 				  int timeout_msec)
 {
 	int err;
-	struct cfg_reset_pkg request = { .header = make_header(route) };
+	struct cfg_reset_pkg request = { .header = tb_cfg_make_header(route) };
 	struct tb_cfg_header reply;
 
 	err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_RESET);
@@ -542,7 +531,7 @@ struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
 {
 	struct tb_cfg_result res = { 0 };
 	struct cfg_read_pkg request = {
-		.header = make_header(route),
+		.header = tb_cfg_make_header(route),
 		.addr = {
 			.port = port,
 			.space = space,
@@ -579,7 +568,7 @@ struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
 {
 	struct tb_cfg_result res = { 0 };
 	struct cfg_write_pkg request = {
-		.header = make_header(route),
+		.header = tb_cfg_make_header(route),
 		.addr = {
 			.port = port,
 			.space = space,

drivers/thunderbolt/ctl.h

@@ -43,6 +43,17 @@ static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header)
 	return (u64) header->route_hi << 32 | header->route_lo;
 }
 
+static inline struct tb_cfg_header tb_cfg_make_header(u64 route)
+{
+	struct tb_cfg_header header = {
+		.route_hi = route >> 32,
+		.route_lo = route,
+	};
+	/* check for overflow, route_hi is not 32 bits! */
+	WARN_ON(tb_cfg_get_route(&header) != route);
+	return header;
+}
+
 int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
 		 enum tb_cfg_error error);
 struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,