thunderbolt: Scan for downstream switches
Add utility methods tb_port_state and tb_wait_for_port. Add
tb_scan_switch which recursively checks for downstream switches.
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index af123c4..70a66fe 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -29,6 +29,7 @@
struct tb_regs_port_header config;
struct tb_switch *sw;
struct tb_port *remote; /* remote port, NULL if not connected */
+ int cap_phy; /* offset, zero if not found */
u8 port; /* port number on switch */
};
@@ -160,6 +161,8 @@
struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
void tb_switch_free(struct tb_switch *sw);
+int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
+
int tb_find_cap(struct tb_port *port, enum tb_cfg_space space, u32 value);
@@ -173,4 +176,17 @@
return port == tb_upstream_port(port->sw);
}
+/**
+ * tb_downstream_route() - get route to downstream switch
+ *
+ * Port must not be the upstream port (otherwise a loop is created).
+ *
+ * Return: Returns a route to the switch behind @port.
+ */
+static inline u64 tb_downstream_route(struct tb_port *port)
+{
+ return tb_route(port->sw)
+ | ((u64) port->port << (port->sw->config.depth * 8));
+}
+
#endif