180 lines
4.0 KiB
C
180 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt link controller support
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*
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* Copyright (C) 2019, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include "tb.h"
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/**
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* tb_lc_read_uuid() - Read switch UUID from link controller common register
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* @sw: Switch whose UUID is read
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* @uuid: UUID is placed here
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*/
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int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid)
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{
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if (!sw->cap_lc)
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return -EINVAL;
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return tb_sw_read(sw, uuid, TB_CFG_SWITCH, sw->cap_lc + TB_LC_FUSE, 4);
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}
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static int read_lc_desc(struct tb_switch *sw, u32 *desc)
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{
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if (!sw->cap_lc)
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return -EINVAL;
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return tb_sw_read(sw, desc, TB_CFG_SWITCH, sw->cap_lc + TB_LC_DESC, 1);
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}
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static int find_port_lc_cap(struct tb_port *port)
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{
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struct tb_switch *sw = port->sw;
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int start, phys, ret, size;
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u32 desc;
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ret = read_lc_desc(sw, &desc);
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if (ret)
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return ret;
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/* Start of port LC registers */
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start = (desc & TB_LC_DESC_SIZE_MASK) >> TB_LC_DESC_SIZE_SHIFT;
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size = (desc & TB_LC_DESC_PORT_SIZE_MASK) >> TB_LC_DESC_PORT_SIZE_SHIFT;
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phys = tb_phy_port_from_link(port->port);
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return sw->cap_lc + start + phys * size;
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}
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static int tb_lc_configure_lane(struct tb_port *port, bool configure)
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{
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bool upstream = tb_is_upstream_port(port);
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struct tb_switch *sw = port->sw;
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u32 ctrl, lane;
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int cap, ret;
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if (sw->generation < 2)
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return 0;
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cap = find_port_lc_cap(port);
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if (cap < 0)
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return cap;
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ret = tb_sw_read(sw, &ctrl, TB_CFG_SWITCH, cap + TB_LC_SX_CTRL, 1);
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if (ret)
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return ret;
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/* Resolve correct lane */
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if (port->port % 2)
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lane = TB_LC_SX_CTRL_L1C;
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else
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lane = TB_LC_SX_CTRL_L2C;
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if (configure) {
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ctrl |= lane;
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if (upstream)
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ctrl |= TB_LC_SX_CTRL_UPSTREAM;
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} else {
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ctrl &= ~lane;
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if (upstream)
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ctrl &= ~TB_LC_SX_CTRL_UPSTREAM;
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}
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return tb_sw_write(sw, &ctrl, TB_CFG_SWITCH, cap + TB_LC_SX_CTRL, 1);
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}
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/**
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* tb_lc_configure_link() - Let LC know about configured link
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* @sw: Switch that is being added
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*
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* Informs LC of both parent switch and @sw that there is established
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* link between the two.
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*/
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int tb_lc_configure_link(struct tb_switch *sw)
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{
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struct tb_port *up, *down;
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int ret;
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if (!sw->config.enabled || !tb_route(sw))
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return 0;
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up = tb_upstream_port(sw);
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down = tb_port_at(tb_route(sw), tb_to_switch(sw->dev.parent));
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/* Configure parent link toward this switch */
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ret = tb_lc_configure_lane(down, true);
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if (ret)
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return ret;
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/* Configure upstream link from this switch to the parent */
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ret = tb_lc_configure_lane(up, true);
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if (ret)
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tb_lc_configure_lane(down, false);
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return ret;
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}
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/**
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* tb_lc_unconfigure_link() - Let LC know about unconfigured link
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* @sw: Switch to unconfigure
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*
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* Informs LC of both parent switch and @sw that the link between the
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* two does not exist anymore.
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*/
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void tb_lc_unconfigure_link(struct tb_switch *sw)
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{
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struct tb_port *up, *down;
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if (sw->is_unplugged || !sw->config.enabled || !tb_route(sw))
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return;
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up = tb_upstream_port(sw);
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down = tb_port_at(tb_route(sw), tb_to_switch(sw->dev.parent));
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tb_lc_configure_lane(up, false);
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tb_lc_configure_lane(down, false);
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}
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/**
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* tb_lc_set_sleep() - Inform LC that the switch is going to sleep
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* @sw: Switch to set sleep
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*
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* Let the switch link controllers know that the switch is going to
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* sleep.
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*/
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int tb_lc_set_sleep(struct tb_switch *sw)
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{
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int start, size, nlc, ret, i;
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u32 desc;
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if (sw->generation < 2)
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return 0;
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ret = read_lc_desc(sw, &desc);
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if (ret)
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return ret;
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/* Figure out number of link controllers */
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nlc = desc & TB_LC_DESC_NLC_MASK;
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start = (desc & TB_LC_DESC_SIZE_MASK) >> TB_LC_DESC_SIZE_SHIFT;
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size = (desc & TB_LC_DESC_PORT_SIZE_MASK) >> TB_LC_DESC_PORT_SIZE_SHIFT;
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/* For each link controller set sleep bit */
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for (i = 0; i < nlc; i++) {
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unsigned int offset = sw->cap_lc + start + i * size;
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u32 ctrl;
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ret = tb_sw_read(sw, &ctrl, TB_CFG_SWITCH,
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offset + TB_LC_SX_CTRL, 1);
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if (ret)
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return ret;
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ctrl |= TB_LC_SX_CTRL_SLP;
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ret = tb_sw_write(sw, &ctrl, TB_CFG_SWITCH,
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offset + TB_LC_SX_CTRL, 1);
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if (ret)
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return ret;
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}
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return 0;
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}
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