linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Thunderbolt driver - Port/Switch config area registers

 *

 * Every thunderbolt device consists (logically) of a switch with multiple

 * ports. Every port contains up to four config regions (HOPS, PORT, SWITCH,

 * COUNTERS) which are used to configure the device.

 *

 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>

 * Copyright (C) 2018, Intel Corporation

 */

​

#ifndef _TB_REGS

#define _TB_REGS

​

#include <linux/types.h>

​

​

#define TB_ROUTE_SHIFT 8  /* number of bits in a port entry of a route */

​

​

/*

 * TODO: should be 63? But we do not know how to receive frames larger than 256

 * bytes at the frame level. (header + checksum = 16, 60*4 = 240)

 */

#define TB_MAX_CONFIG_RW_LENGTH 60

​

enum tb_switch_cap {

    TB_SWITCH_CAP_VSE       = 0x05,

};

​

enum tb_switch_vse_cap {

    TB_VSE_CAP_PLUG_EVENTS      = 0x01, /* also EEPROM */

    TB_VSE_CAP_TIME2        = 0x03,

    TB_VSE_CAP_IECS         = 0x04,

    TB_VSE_CAP_LINK_CONTROLLER  = 0x06, /* also IECS */

};

​

enum tb_port_cap {

    TB_PORT_CAP_PHY         = 0x01,

    TB_PORT_CAP_TIME1       = 0x03,

    TB_PORT_CAP_ADAP        = 0x04,

    TB_PORT_CAP_VSE         = 0x05,

};

​

enum tb_port_state {

    TB_PORT_DISABLED    = 0, /* tb_cap_phy.disable == 1 */

    TB_PORT_CONNECTING  = 1, /* retry */

    TB_PORT_UP      = 2,

    TB_PORT_UNPLUGGED   = 7,

};

​

/* capability headers */

​

struct tb_cap_basic {

    u8 next;

    /* enum tb_cap cap:8; prevent "narrower than values of its type" */

    u8 cap; /* if cap == 0x05 then we have a extended capability */

} __packed;

​

/**

 * struct tb_cap_extended_short - Switch extended short capability

 * @next: Pointer to the next capability. If @next and @length are zero

 *    then we have a long cap.

 * @cap: Base capability ID (see &enum tb_switch_cap)

 * @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)

 * @length: Length of this capability

 */

struct tb_cap_extended_short {

    u8 next;

    u8 cap;

    u8 vsec_id;

    u8 length;

} __packed;

​

/**

 * struct tb_cap_extended_long - Switch extended long capability

 * @zero1: This field should be zero

 * @cap: Base capability ID (see &enum tb_switch_cap)

 * @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)

 * @zero2: This field should be zero

 * @next: Pointer to the next capability

 * @length: Length of this capability

 */

struct tb_cap_extended_long {

    u8 zero1;

    u8 cap;

    u8 vsec_id;

    u8 zero2;

    u16 next;

    u16 length;

} __packed;