241 lines
5.8 KiB
C
241 lines
5.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Thunderbolt Cactus Ridge driver - Port/Switch config area registers
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*
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* Every thunderbolt device consists (logically) of a switch with multiple
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* ports. Every port contains up to four config regions (HOPS, PORT, SWITCH,
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* COUNTERS) which are used to configure the device.
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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#ifndef _TB_REGS
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#define _TB_REGS
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#include <linux/types.h>
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#define TB_ROUTE_SHIFT 8 /* number of bits in a port entry of a route */
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/*
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* TODO: should be 63? But we do not know how to receive frames larger than 256
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* bytes at the frame level. (header + checksum = 16, 60*4 = 240)
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*/
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#define TB_MAX_CONFIG_RW_LENGTH 60
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enum tb_switch_cap {
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TB_SWITCH_CAP_VSE = 0x05,
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};
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enum tb_switch_vse_cap {
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TB_VSE_CAP_PLUG_EVENTS = 0x01, /* also EEPROM */
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TB_VSE_CAP_TIME2 = 0x03,
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TB_VSE_CAP_IECS = 0x04,
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TB_VSE_CAP_LINK_CONTROLLER = 0x06, /* also IECS */
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};
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enum tb_port_cap {
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TB_PORT_CAP_PHY = 0x01,
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TB_PORT_CAP_TIME1 = 0x03,
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TB_PORT_CAP_ADAP = 0x04,
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TB_PORT_CAP_VSE = 0x05,
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};
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enum tb_port_state {
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TB_PORT_DISABLED = 0, /* tb_cap_phy.disable == 1 */
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TB_PORT_CONNECTING = 1, /* retry */
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TB_PORT_UP = 2,
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TB_PORT_UNPLUGGED = 7,
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};
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/* capability headers */
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struct tb_cap_basic {
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u8 next;
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/* enum tb_cap cap:8; prevent "narrower than values of its type" */
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u8 cap; /* if cap == 0x05 then we have a extended capability */
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} __packed;
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/**
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* struct tb_cap_extended_short - Switch extended short capability
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* @next: Pointer to the next capability. If @next and @length are zero
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* then we have a long cap.
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* @cap: Base capability ID (see &enum tb_switch_cap)
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* @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)
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* @length: Length of this capability
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*/
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struct tb_cap_extended_short {
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u8 next;
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u8 cap;
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u8 vsec_id;
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u8 length;
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} __packed;
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/**
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* struct tb_cap_extended_long - Switch extended long capability
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* @zero1: This field should be zero
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* @cap: Base capability ID (see &enum tb_switch_cap)
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* @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)
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* @zero2: This field should be zero
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* @next: Pointer to the next capability
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* @length: Length of this capability
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*/
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struct tb_cap_extended_long {
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u8 zero1;
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u8 cap;
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u8 vsec_id;
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u8 zero2;
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u16 next;
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u16 length;
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} __packed;
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/* capabilities */
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struct tb_cap_link_controller {
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struct tb_cap_extended_long cap_header;
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u32 count:4; /* number of link controllers */
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u32 unknown1:4;
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u32 base_offset:8; /*
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* offset (into this capability) of the configuration
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* area of the first link controller
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*/
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u32 length:12; /* link controller configuration area length */
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u32 unknown2:4; /* TODO check that length is correct */
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} __packed;
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struct tb_cap_phy {
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struct tb_cap_basic cap_header;
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u32 unknown1:16;
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u32 unknown2:14;
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bool disable:1;
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u32 unknown3:11;
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enum tb_port_state state:4;
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u32 unknown4:2;
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} __packed;
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struct tb_eeprom_ctl {
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bool clock:1; /* send pulse to transfer one bit */
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bool access_low:1; /* set to 0 before access */
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bool data_out:1; /* to eeprom */
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bool data_in:1; /* from eeprom */
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bool access_high:1; /* set to 1 before access */
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bool not_present:1; /* should be 0 */
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bool unknown1:1;
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bool present:1; /* should be 1 */
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u32 unknown2:24;
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} __packed;
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struct tb_cap_plug_events {
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struct tb_cap_extended_short cap_header;
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u32 __unknown1:2;
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u32 plug_events:5;
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u32 __unknown2:25;
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u32 __unknown3;
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u32 __unknown4;
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struct tb_eeprom_ctl eeprom_ctl;
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u32 __unknown5[7];
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u32 drom_offset; /* 32 bit register, but eeprom addresses are 16 bit */
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} __packed;
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/* device headers */
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/* Present on port 0 in TB_CFG_SWITCH at address zero. */
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struct tb_regs_switch_header {
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/* DWORD 0 */
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u16 vendor_id;
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u16 device_id;
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/* DWORD 1 */
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u32 first_cap_offset:8;
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u32 upstream_port_number:6;
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u32 max_port_number:6;
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u32 depth:3;
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u32 __unknown1:1;
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u32 revision:8;
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/* DWORD 2 */
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u32 route_lo;
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/* DWORD 3 */
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u32 route_hi:31;
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bool enabled:1;
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/* DWORD 4 */
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u32 plug_events_delay:8; /*
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* RW, pause between plug events in
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* milliseconds. Writing 0x00 is interpreted
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* as 255ms.
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*/
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u32 __unknown4:16;
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u32 thunderbolt_version:8;
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} __packed;
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enum tb_port_type {
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TB_TYPE_INACTIVE = 0x000000,
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TB_TYPE_PORT = 0x000001,
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TB_TYPE_NHI = 0x000002,
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/* TB_TYPE_ETHERNET = 0x020000, lower order bits are not known */
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/* TB_TYPE_SATA = 0x080000, lower order bits are not known */
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TB_TYPE_DP_HDMI_IN = 0x0e0101,
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TB_TYPE_DP_HDMI_OUT = 0x0e0102,
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TB_TYPE_PCIE_DOWN = 0x100101,
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TB_TYPE_PCIE_UP = 0x100102,
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/* TB_TYPE_USB = 0x200000, lower order bits are not known */
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};
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/* Present on every port in TB_CF_PORT at address zero. */
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struct tb_regs_port_header {
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/* DWORD 0 */
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u16 vendor_id;
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u16 device_id;
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/* DWORD 1 */
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u32 first_cap_offset:8;
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u32 max_counters:11;
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u32 __unknown1:5;
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u32 revision:8;
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/* DWORD 2 */
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enum tb_port_type type:24;
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u32 thunderbolt_version:8;
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/* DWORD 3 */
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u32 __unknown2:20;
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u32 port_number:6;
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u32 __unknown3:6;
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/* DWORD 4 */
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u32 nfc_credits;
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/* DWORD 5 */
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u32 max_in_hop_id:11;
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u32 max_out_hop_id:11;
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u32 __unkown4:10;
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/* DWORD 6 */
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u32 __unknown5;
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/* DWORD 7 */
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u32 __unknown6;
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} __packed;
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/* Hop register from TB_CFG_HOPS. 8 byte per entry. */
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struct tb_regs_hop {
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/* DWORD 0 */
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u32 next_hop:11; /*
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* hop to take after sending the packet through
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* out_port (on the incoming port of the next switch)
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*/
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u32 out_port:6; /* next port of the path (on the same switch) */
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u32 initial_credits:8;
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u32 unknown1:6; /* set to zero */
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bool enable:1;
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/* DWORD 1 */
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u32 weight:4;
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u32 unknown2:4; /* set to zero */
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u32 priority:3;
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bool drop_packages:1;
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u32 counter:11; /* index into TB_CFG_COUNTERS on this port */
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bool counter_enable:1;
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bool ingress_fc:1;
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bool egress_fc:1;
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bool ingress_shared_buffer:1;
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bool egress_shared_buffer:1;
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u32 unknown3:4; /* set to zero */
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} __packed;
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#endif
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