1 // SPDX-License-Identifier: GPL-2.0
3  * Thunderbolt link controller support
14  * tb_lc_read_uuid() - Read switch UUID from link controller common register
20 	if (!sw->cap_lc)  in tb_lc_read_uuid()
21 		return -EINVAL;  in tb_lc_read_uuid()
22 	return tb_sw_read(sw, uuid, TB_CFG_SWITCH, sw->cap_lc + TB_LC_FUSE, 4);  in tb_lc_read_uuid()
27 	if (!sw->cap_lc)  in read_lc_desc()
28 		return -EINVAL;  in read_lc_desc()
29 	return tb_sw_read(sw, desc, TB_CFG_SWITCH, sw->cap_lc + TB_LC_DESC, 1);  in read_lc_desc()
34 	struct tb_switch *sw = port->sw;  in find_port_lc_cap()
45 	phys = tb_phy_port_from_link(port->port);  in find_port_lc_cap()
47 	return sw->cap_lc + start + phys * size;  in find_port_lc_cap()
51  * tb_lc_reset_port() - Trigger downstream port reset through LC
54  * Triggers downstream port reset through link controller registers.
56  * non-USB4 routers with link controller (that's Thunderbolt 2 and
61 	struct tb_switch *sw = port->sw;  in tb_lc_reset_port()
65 	if (sw->generation < 2)  in tb_lc_reset_port()
66 		return -EINVAL;  in tb_lc_reset_port()
96 	struct tb_switch *sw = port->sw;  in tb_lc_set_port_configured()
100 	if (sw->generation < 2)  in tb_lc_set_port_configured()
112 	if (port->port % 2)  in tb_lc_set_port_configured()
131  * tb_lc_configure_port() - Let LC know about configured port
142  * tb_lc_unconfigure_port() - Let LC know about unconfigured port
154 	struct tb_switch *sw = port->sw;  in tb_lc_set_xdomain_configured()
158 	if (sw->generation < 2)  in tb_lc_set_xdomain_configured()
170 	if (port->port % 2)  in tb_lc_set_xdomain_configured()
184  * tb_lc_configure_xdomain() - Inform LC that the link is XDomain
196  * tb_lc_unconfigure_xdomain() - Unconfigure XDomain from port
207  * tb_lc_start_lane_initialization() - Start lane initialization
218 	struct tb_switch *sw = port->sw;  in tb_lc_start_lane_initialization()
225 	if (sw->generation < 2)  in tb_lc_start_lane_initialization()
242  * tb_lc_is_clx_supported() - Check whether CLx is supported by the lane adapter
250 	struct tb_switch *sw = port->sw;  in tb_lc_is_clx_supported()
266  * tb_lc_is_usb_plugged() - Is there USB device connected to port
269  * Returns true if the @port has USB type-C device connected.
273 	struct tb_switch *sw = port->sw;  in tb_lc_is_usb_plugged()
277 	if (sw->generation != 3)  in tb_lc_is_usb_plugged()
292  * tb_lc_is_xhci_connected() - Is the internal xHCI connected
299 	struct tb_switch *sw = port->sw;  in tb_lc_is_xhci_connected()
303 	if (sw->generation != 3)  in tb_lc_is_xhci_connected()
319 	struct tb_switch *sw = port->sw;  in __tb_lc_xhci_connect()
323 	if (sw->generation != 3)  in __tb_lc_xhci_connect()
324 		return -EINVAL;  in __tb_lc_xhci_connect()
343  * tb_lc_xhci_connect() - Connect internal xHCI
363  * tb_lc_xhci_disconnect() - Disconnect internal xHCI
406  * tb_lc_set_wake() - Enable/disable wake
417 	if (sw->generation < 2)  in tb_lc_set_wake()
432 	/* For each link controller set sleep bit */  in tb_lc_set_wake()
434 		unsigned int offset = sw->cap_lc + start + i * size;  in tb_lc_set_wake()
445  * tb_lc_set_sleep() - Inform LC that the switch is going to sleep
456 	if (sw->generation < 2)  in tb_lc_set_sleep()
468 	/* For each link controller set sleep bit */  in tb_lc_set_sleep()
470 		unsigned int offset = sw->cap_lc + start + i * size;  in tb_lc_set_sleep()
489  * tb_lc_lane_bonding_possible() - Is lane bonding possible towards switch
501 	if (sw->generation < 2)  in tb_lc_lane_bonding_possible()
521 	/* The first DP IN port is sink 0 and second is sink 1 */  in tb_lc_dp_sink_from_port()
527 	return -EINVAL;  in tb_lc_dp_sink_from_port()
536 			 sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_available()
555 	return -EBUSY;  in tb_lc_dp_sink_available()
559  * tb_lc_dp_sink_query() - Is DP sink available for DP IN port
560  * @sw: Switch whose DP sink is queried
561  * @in: DP IN port to check
563  * Queries through LC SNK_ALLOCATION registers whether DP sink is available
564  * for the given DP IN port or not.
574 	if (sw->generation < 3)  in tb_lc_dp_sink_query()
585  * tb_lc_dp_sink_alloc() - Allocate DP sink
586  * @sw: Switch whose DP sink is allocated
587  * @in: DP IN port the DP sink is allocated for
589  * Allocate DP sink for @in via LC SNK_ALLOCATION registers. If the
591  * other cases returs negative errno. In particular %-EBUSY is returned if
599 	if (sw->generation < 3)  in tb_lc_dp_sink_alloc()
611 			 sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_alloc()
625 			  sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_alloc()
635  * tb_lc_dp_sink_dealloc() - De-allocate DP sink
636  * @sw: Switch whose DP sink is de-allocated
637  * @in: DP IN port whose DP sink is de-allocated
639  * De-allocate DP sink from @in using LC SNK_ALLOCATION registers.
646 	if (sw->generation < 3)  in tb_lc_dp_sink_dealloc()
659 			 sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_dealloc()
669 			  sw->cap_lc + TB_LC_SNK_ALLOCATION, 1);  in tb_lc_dp_sink_dealloc()
673 	tb_port_dbg(in, "sink %d de-allocated\n", sink);  in tb_lc_dp_sink_dealloc()
678  * tb_lc_force_power() - Forces LC to be powered on