15c6784c7c
Intel has done pretty major changes to the driver and we continue to do so in the future as well. Add Intel as copyright holder of the files we have done changes. While there drop "Cactus Ridge" from the headers because this driver works also with other Thunderbolt controllers. No functional changes intended. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <yehezkelshb@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt driver - capabilities lookup
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2018, Intel Corporation
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*/
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include "tb.h"
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#define CAP_OFFSET_MAX 0xff
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#define VSE_CAP_OFFSET_MAX 0xffff
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struct tb_cap_any {
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union {
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struct tb_cap_basic basic;
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struct tb_cap_extended_short extended_short;
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struct tb_cap_extended_long extended_long;
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};
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} __packed;
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/**
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* tb_port_find_cap() - Find port capability
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* @port: Port to find the capability for
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* @cap: Capability to look
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*
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* Returns offset to start of capability or %-ENOENT if no such
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* capability was found. Negative errno is returned if there was an
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* error.
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*/
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int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap)
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{
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u32 offset;
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/*
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* DP out adapters claim to implement TMU capability but in
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* reality they do not so we hard code the adapter specific
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* capability offset here.
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*/
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if (port->config.type == TB_TYPE_DP_HDMI_OUT)
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offset = 0x39;
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else
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offset = 0x1;
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do {
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struct tb_cap_any header;
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int ret;
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ret = tb_port_read(port, &header, TB_CFG_PORT, offset, 1);
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if (ret)
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return ret;
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if (header.basic.cap == cap)
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return offset;
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offset = header.basic.next;
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} while (offset);
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return -ENOENT;
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}
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static int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap)
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{
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int offset = sw->config.first_cap_offset;
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while (offset > 0 && offset < CAP_OFFSET_MAX) {
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struct tb_cap_any header;
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int ret;
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ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 1);
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if (ret)
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return ret;
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if (header.basic.cap == cap)
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return offset;
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offset = header.basic.next;
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}
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return -ENOENT;
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}
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/**
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* tb_switch_find_vse_cap() - Find switch vendor specific capability
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* @sw: Switch to find the capability for
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* @vsec: Vendor specific capability to look
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*
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* Functions enumerates vendor specific capabilities (VSEC) of a switch
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* and returns offset when capability matching @vsec is found. If no
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* such capability is found returns %-ENOENT. In case of error returns
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* negative errno.
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*/
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int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec)
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{
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struct tb_cap_any header;
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int offset;
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offset = tb_switch_find_cap(sw, TB_SWITCH_CAP_VSE);
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if (offset < 0)
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return offset;
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while (offset > 0 && offset < VSE_CAP_OFFSET_MAX) {
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int ret;
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ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 2);
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if (ret)
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return ret;
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/*
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* Extended vendor specific capabilities come in two
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* flavors: short and long. The latter is used when
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* offset is over 0xff.
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*/
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if (offset >= CAP_OFFSET_MAX) {
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if (header.extended_long.vsec_id == vsec)
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return offset;
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offset = header.extended_long.next;
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} else {
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if (header.extended_short.vsec_id == vsec)
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return offset;
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if (!header.extended_short.length)
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return -ENOENT;
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offset = header.extended_short.next;
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}
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}
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return -ENOENT;
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}
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