1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Thunderbolt driver - Port/Switch config area registers
5 * Every thunderbolt device consists (logically) of a switch with multiple
6 * ports. Every port contains up to four config regions (HOPS, PORT, SWITCH,
7 * COUNTERS) which are used to configure the device.
10 * Copyright (C) 2018, Intel Corporation
16 #include <linux/types.h>
19 #define TB_ROUTE_SHIFT 8 /* number of bits in a port entry of a route */
23 * TODO: should be 63? But we do not know how to receive frames larger than 256
24 * bytes at the frame level. (header + checksum = 16, 60*4 = 240)
26 #define TB_MAX_CONFIG_RW_LENGTH 60
29 TB_SWITCH_CAP_VSE = 0x05,
32 enum tb_switch_vse_cap {
33 TB_VSE_CAP_PLUG_EVENTS = 0x01, /* also EEPROM */
34 TB_VSE_CAP_TIME2 = 0x03,
35 TB_VSE_CAP_IECS = 0x04,
36 TB_VSE_CAP_LINK_CONTROLLER = 0x06, /* also IECS */
40 TB_PORT_CAP_PHY = 0x01,
41 TB_PORT_CAP_TIME1 = 0x03,
42 TB_PORT_CAP_ADAP = 0x04,
43 TB_PORT_CAP_VSE = 0x05,
47 TB_PORT_DISABLED = 0, /* tb_cap_phy.disable == 1 */
48 TB_PORT_CONNECTING = 1, /* retry */
50 TB_PORT_UNPLUGGED = 7,
53 /* capability headers */
57 /* enum tb_cap cap:8; prevent "narrower than values of its type" */
58 u8 cap; /* if cap == 0x05 then we have a extended capability */
62 * struct tb_cap_extended_short - Switch extended short capability
63 * @next: Pointer to the next capability. If @next and @length are zero
64 * then we have a long cap.
65 * @cap: Base capability ID (see &enum tb_switch_cap)
66 * @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)
67 * @length: Length of this capability
69 struct tb_cap_extended_short {
77 * struct tb_cap_extended_long - Switch extended long capability
78 * @zero1: This field should be zero
79 * @cap: Base capability ID (see &enum tb_switch_cap)
80 * @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)
81 * @zero2: This field should be zero
82 * @next: Pointer to the next capability
83 * @length: Length of this capability
85 struct tb_cap_extended_long {
96 struct tb_cap_link_controller {
97 struct tb_cap_extended_long cap_header;
98 u32 count:4; /* number of link controllers */
100 u32 base_offset:8; /*
101 * offset (into this capability) of the configuration
102 * area of the first link controller
104 u32 length:12; /* link controller configuration area length */
105 u32 unknown2:4; /* TODO check that length is correct */
109 struct tb_cap_basic cap_header;
114 enum tb_port_state state:4;
118 struct tb_eeprom_ctl {
119 bool clock:1; /* send pulse to transfer one bit */
120 bool access_low:1; /* set to 0 before access */
121 bool data_out:1; /* to eeprom */
122 bool data_in:1; /* from eeprom */
123 bool access_high:1; /* set to 1 before access */
124 bool not_present:1; /* should be 0 */
126 bool present:1; /* should be 1 */
130 struct tb_cap_plug_events {
131 struct tb_cap_extended_short cap_header;
137 struct tb_eeprom_ctl eeprom_ctl;
139 u32 drom_offset; /* 32 bit register, but eeprom addresses are 16 bit */
144 /* Present on port 0 in TB_CFG_SWITCH at address zero. */
145 struct tb_regs_switch_header {
150 u32 first_cap_offset:8;
151 u32 upstream_port_number:6;
152 u32 max_port_number:6;
162 u32 plug_events_delay:8; /*
163 * RW, pause between plug events in
164 * milliseconds. Writing 0x00 is interpreted
168 u32 thunderbolt_version:8;
172 TB_TYPE_INACTIVE = 0x000000,
173 TB_TYPE_PORT = 0x000001,
174 TB_TYPE_NHI = 0x000002,
175 /* TB_TYPE_ETHERNET = 0x020000, lower order bits are not known */
176 /* TB_TYPE_SATA = 0x080000, lower order bits are not known */
177 TB_TYPE_DP_HDMI_IN = 0x0e0101,
178 TB_TYPE_DP_HDMI_OUT = 0x0e0102,
179 TB_TYPE_PCIE_DOWN = 0x100101,
180 TB_TYPE_PCIE_UP = 0x100102,
181 /* TB_TYPE_USB = 0x200000, lower order bits are not known */
184 /* Present on every port in TB_CF_PORT at address zero. */
185 struct tb_regs_port_header {
190 u32 first_cap_offset:8;
195 enum tb_port_type type:24;
196 u32 thunderbolt_version:8;
204 u32 max_in_hop_id:11;
205 u32 max_out_hop_id:11;
214 /* Hop register from TB_CFG_HOPS. 8 byte per entry. */
218 * hop to take after sending the packet through
219 * out_port (on the incoming port of the next switch)
221 u32 out_port:6; /* next port of the path (on the same switch) */
222 u32 initial_credits:8;
223 u32 unknown1:6; /* set to zero */
228 u32 unknown2:4; /* set to zero */
230 bool drop_packages:1;
231 u32 counter:11; /* index into TB_CFG_COUNTERS on this port */
232 bool counter_enable:1;
235 bool ingress_shared_buffer:1;
236 bool egress_shared_buffer:1;
237 u32 unknown3:4; /* set to zero */