linux-imx

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

/*

 * Thunderbolt driver - control channel and configuration commands

 *

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

 * Copyright (C) 2018, Intel Corporation

 */

​

#ifndef _TB_CFG

#define _TB_CFG

​

#include <linux/kref.h>

#include <linux/thunderbolt.h>

​

#include "nhi.h"

#include "tb_msgs.h"

​

/* control channel */

struct tb_ctl;

​

typedef bool (*event_cb)(void *data, enum tb_cfg_pkg_type type,

             const void *buf, size_t size);

​

struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data);

void tb_ctl_start(struct tb_ctl *ctl);

void tb_ctl_stop(struct tb_ctl *ctl);

void tb_ctl_free(struct tb_ctl *ctl);

​

/* configuration commands */

​

#define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */

​

struct tb_cfg_result {

    u64 response_route;

    u32 response_port; /*

                * If err = 1 then this is the port that send the

                * error.

                * If err = 0 and if this was a cfg_read/write then

                * this is the the upstream port of the responding

                * switch.

                * Otherwise the field is set to zero.

                */

    int err; /* negative errors, 0 for success, 1 for tb errors */

    enum tb_cfg_error tb_error; /* valid if err == 1 */

};

​

struct ctl_pkg {

    struct tb_ctl *ctl;

    void *buffer;

    struct ring_frame frame;

};

​

/**

 * struct tb_cfg_request - Control channel request

 * @kref: Reference count

 * @ctl: Pointer to the control channel structure. Only set when the

 *   request is queued.

 * @request_size: Size of the request packet (in bytes)

 * @request_type: Type of the request packet

 * @response: Response is stored here

 * @response_size: Maximum size of one response packet

 * @response_type: Expected type of the response packet

 * @npackets: Number of packets expected to be returned with this request