linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Thunderbolt Cactus Ridge driver - bus logic (NHI independent)

 *

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

 */

​

#include <linux/slab.h>

#include <linux/errno.h>

#include <linux/delay.h>

#include <linux/platform_data/x86/apple.h>

​

#include "tb.h"

#include "tb_regs.h"

#include "tunnel_pci.h"

​

/**

 * struct tb_cm - Simple Thunderbolt connection manager

 * @tunnel_list: List of active tunnels

 * @hotplug_active: tb_handle_hotplug will stop progressing plug

 *          events and exit if this is not set (it needs to

 *          acquire the lock one more time). Used to drain wq

 *          after cfg has been paused.

 */

struct tb_cm {

    struct list_head tunnel_list;

    bool hotplug_active;

};

​

/* enumeration & hot plug handling */

​

​

static void tb_scan_port(struct tb_port *port);

​

/**

 * tb_scan_switch() - scan for and initialize downstream switches

 */

static void tb_scan_switch(struct tb_switch *sw)

{

    int i;

    for (i = 1; i <= sw->config.max_port_number; i++)

        tb_scan_port(&sw->ports[i]);

}

​

/**

 * tb_scan_port() - check for and initialize switches below port

 */

static void tb_scan_port(struct tb_port *port)

{

    struct tb_switch *sw;

    if (tb_is_upstream_port(port))

        return;

    if (port->config.type != TB_TYPE_PORT)

        return;

    if (port->dual_link_port && port->link_nr)

        return; /*

             * Downstream switch is reachable through two ports.

             * Only scan on the primary port (link_nr == 0).

             */

    if (tb_wait_for_port(port, false) <= 0)

        return;

    if (port->remote) {

        tb_port_WARN(port, "port already has a remote!\n");