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thunderbolt: Scan for downstream switches

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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>
This commit is contained in:
Andreas Noever
2014-06-03 22:04:05 +02:00
committed by Greg Kroah-Hartman
parent ca389f716f
commit 9da672a428
3 changed files with 157 additions and 0 deletions
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16
drivers/thunderbolt/tb.h
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@@ -29,6 +29,7 @@ struct tb_port {
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 @@ void thunderbolt_shutdown_and_free(struct tb *tb);
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 @@ static inline bool tb_is_upstream_port(struct tb_port *port)
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