1 // SPDX-License-Identifier: GPL-2.0
12  * tb_lc_read_uuid() - Read switch UUID from link controller common register
18 	if (!sw->cap_lc)  in tb_lc_read_uuid()
19 		return -EINVAL;  in tb_lc_read_uuid()
20 	return tb_sw_read(sw, uuid, TB_CFG_SWITCH, sw->cap_lc + TB_LC_FUSE, 4);  in tb_lc_read_uuid()
25 	if (!sw->cap_lc)  in read_lc_desc()
26 		return -EINVAL;  in read_lc_desc()
27 	return tb_sw_read(sw, desc, TB_CFG_SWITCH, sw->cap_lc + TB_LC_DESC, 1);  in read_lc_desc()
30 static int find_port_lc_cap(struct tb_port *port)  in find_port_lc_cap()  argument
32 	struct tb_switch *sw = port->sw;  in find_port_lc_cap()
40 	/* Start of port LC registers */  in find_port_lc_cap()
43 	phys = tb_phy_port_from_link(port->port);  in find_port_lc_cap()
45 	return sw->cap_lc + start + phys * size;  in find_port_lc_cap()
48 static int tb_lc_set_port_configured(struct tb_port *port, bool configured)  in tb_lc_set_port_configured()  argument
50 	bool upstream = tb_is_upstream_port(port);  in tb_lc_set_port_configured()
51 	struct tb_switch *sw = port->sw;  in tb_lc_set_port_configured()
55 	if (sw->generation < 2)  in tb_lc_set_port_configured()
58 	cap = find_port_lc_cap(port);  in tb_lc_set_port_configured()
67 	if (port->port % 2)  in tb_lc_set_port_configured()
86  * tb_lc_configure_port() - Let LC know about configured port
87  * @port: Port that is set as configured
89  * Sets the port configured for power management purposes.
91 int tb_lc_configure_port(struct tb_port *port)  in tb_lc_configure_port()  argument
93 	return tb_lc_set_port_configured(port, true);  in tb_lc_configure_port()
97  * tb_lc_unconfigure_port() - Let LC know about unconfigured port
98  * @port: Port that is set as configured
100  * Sets the port unconfigured for power management purposes.
102 void tb_lc_unconfigure_port(struct tb_port *port)  in tb_lc_unconfigure_port()  argument
104 	tb_lc_set_port_configured(port, false);  in tb_lc_unconfigure_port()
107 static int tb_lc_set_xdomain_configured(struct tb_port *port, bool configure)  in tb_lc_set_xdomain_configured()  argument
109 	struct tb_switch *sw = port->sw;  in tb_lc_set_xdomain_configured()
113 	if (sw->generation < 2)  in tb_lc_set_xdomain_configured()
116 	cap = find_port_lc_cap(port);  in tb_lc_set_xdomain_configured()
125 	if (port->port % 2)  in tb_lc_set_xdomain_configured()
139  * tb_lc_configure_xdomain() - Inform LC that the link is XDomain
140  * @port: Switch downstream port connected to another host
145 int tb_lc_configure_xdomain(struct tb_port *port)  in tb_lc_configure_xdomain()  argument
147 	return tb_lc_set_xdomain_configured(port, true);  in tb_lc_configure_xdomain()
151  * tb_lc_unconfigure_xdomain() - Unconfigure XDomain from port
152  * @port: Switch downstream port that was connected to another host
156 void tb_lc_unconfigure_xdomain(struct tb_port *port)  in tb_lc_unconfigure_xdomain()  argument
158 	tb_lc_set_xdomain_configured(port, false);  in tb_lc_unconfigure_xdomain()
190  * tb_lc_set_wake() - Enable/disable wake
201 	if (sw->generation < 2)  in tb_lc_set_wake()
218 		unsigned int offset = sw->cap_lc + start + i * size;  in tb_lc_set_wake()
229  * tb_lc_set_sleep() - Inform LC that the switch is going to sleep
240 	if (sw->generation < 2)  in tb_lc_set_sleep()
254 		unsigned int offset = sw->cap_lc + start + i * size;  in tb_lc_set_sleep()
273  * tb_lc_lane_bonding_possible() - Is lane bonding possible towards switch
285 	if (sw->generation < 2)  in tb_lc_lane_bonding_possible()
303 	struct tb_port *port;  in tb_lc_dp_sink_from_port()  local
305 	/* The first DP IN port is sink 0 and second is sink 1 */  in tb_lc_dp_sink_from_port()
306 	tb_switch_for_each_port(sw, port) {  in tb_lc_dp_sink_from_port()
307 		if (tb_port_is_dpin(port))  in tb_lc_dp_sink_from_port()
308 			return in != port;  in tb_lc_dp_sink_from_port()
311 	return -EINVAL;  in tb_lc_dp_sink_from_port()
320 			 sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_available()
339 	return -EBUSY;  in tb_lc_dp_sink_available()
343  * tb_lc_dp_sink_query() - Is DP sink available for DP IN port
344  * @sw: Switch whose DP sink is queried
345  * @in: DP IN port to check
347  * Queries through LC SNK_ALLOCATION registers whether DP sink is available
348  * for the given DP IN port or not.
358 	if (sw->generation < 3)  in tb_lc_dp_sink_query()
369  * tb_lc_dp_sink_alloc() - Allocate DP sink
370  * @sw: Switch whose DP sink is allocated
371  * @in: DP IN port the DP sink is allocated for
373  * Allocate DP sink for @in via LC SNK_ALLOCATION registers. If the
375  * other cases returs negative errno. In particular %-EBUSY is returned if
383 	if (sw->generation < 3)  in tb_lc_dp_sink_alloc()
395 			 sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_alloc()
409 			  sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_alloc()
419  * tb_lc_dp_sink_dealloc() - De-allocate DP sink
420  * @sw: Switch whose DP sink is de-allocated
421  * @in: DP IN port whose DP sink is de-allocated
423  * De-allocate DP sink from @in using LC SNK_ALLOCATION registers.
430 	if (sw->generation < 3)  in tb_lc_dp_sink_dealloc()
443 			 sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_dealloc()
453 			  sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_dealloc()
457 	tb_port_dbg(in, "sink %d de-allocated\n", sink);  in tb_lc_dp_sink_dealloc()
462  * tb_lc_force_power() - Forces LC to be powered on