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![Mika Westerberg](/assets/img/avatar_default.png)
Light Ridge and Eagle Ridge both need to have TMU access enabled before port space can be fully accessed so make sure it happens on those. This allows us to get rid of the offset quirk in tb_port_find_cap(). Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
166 lines
3.5 KiB
C
166 lines
3.5 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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#define TMU_ACCESS_EN BIT(20)
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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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static int tb_port_enable_tmu(struct tb_port *port, bool enable)
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{
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struct tb_switch *sw = port->sw;
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u32 value, offset;
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int ret;
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/*
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* Legacy devices need to have TMU access enabled before port
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* space can be fully accessed.
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*/
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if (tb_switch_is_lr(sw))
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offset = 0x26;
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else if (tb_switch_is_er(sw))
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offset = 0x2a;
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else
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return 0;
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ret = tb_sw_read(sw, &value, TB_CFG_SWITCH, offset, 1);
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if (ret)
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return ret;
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if (enable)
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value |= TMU_ACCESS_EN;
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else
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value &= ~TMU_ACCESS_EN;
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return tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
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}
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static int __tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap)
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{
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u32 offset = 1;
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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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/**
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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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int ret;
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ret = tb_port_enable_tmu(port, true);
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if (ret)
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return ret;
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ret = __tb_port_find_cap(port, cap);
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tb_port_enable_tmu(port, false);
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return ret;
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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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