/*-
 * Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * This software was developed by SRI International and the University of
 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
 * ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <machine/bus.h>

#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <arm64/coresight/coresight.h>

static int
coresight_fdt_get_ports(phandle_t dev_node,
    struct coresight_platform_data *pdata)
{
        phandle_t node, child;
        pcell_t port_reg;
        phandle_t xref;
        char *name;
        int ret;
        phandle_t endpoint_child;
        struct endpoint *endp;

        child = ofw_bus_find_child(dev_node, "ports");
        if (child)
                node = child;
        else
                node = dev_node;

        for (child = OF_child(node); child != 0; child = OF_peer(child)) {
                ret = OF_getprop_alloc(child, "name", (void **)&name);
                if (ret == -1)
                        continue;

                if (strcasecmp(name, "port") ||
                    strncasecmp(name, "port@", 6)) {
                        port_reg = -1;
                        OF_getencprop(child, "reg", (void *)&port_reg,
                            sizeof(port_reg));

                        endpoint_child = ofw_bus_find_child(child, "endpoint");
                        if (endpoint_child) {
                                if (OF_getencprop(endpoint_child,
                                    "remote-endpoint", &xref,
                                    sizeof(xref)) == -1) {
                                        printf("failed\n");
                                        continue;
                                }
                                endp = malloc(sizeof(struct endpoint),
                                    M_CORESIGHT, M_WAITOK | M_ZERO);
                                endp->my_node = endpoint_child;
                                endp->their_node = OF_node_from_xref(xref);
                                endp->dev_node = dev_node;
                                endp->reg = port_reg;
                                if (OF_getproplen(endpoint_child,
                                    "slave-mode") >= 0) {
                                        pdata->in_ports++;
                                        endp->input = 1;
                                } else
                                        pdata->out_ports++;

                                mtx_lock(&pdata->mtx_lock);
                                TAILQ_INSERT_TAIL(&pdata->endpoints,
                                    endp, link);
                                mtx_unlock(&pdata->mtx_lock);
                        }
                }
        }

        return (0);
}

static int
coresight_fdt_get_cpu(phandle_t node,
    struct coresight_platform_data *pdata)
{
        phandle_t cpu_node;
        pcell_t xref;
        pcell_t cpu_reg;

        if (OF_getencprop(node, "cpu", &xref, sizeof(xref)) != -1) {
                cpu_node = OF_node_from_xref(xref);
                if (OF_getencprop(cpu_node, "reg", (void *)&cpu_reg,
                        sizeof(cpu_reg)) > 0) {
                        pdata->cpu = cpu_reg;
                        return (0);
                }
        }

        return (-1);
}

struct coresight_platform_data *
coresight_fdt_get_platform_data(device_t dev)
{
        struct coresight_platform_data *pdata;
        phandle_t node;

        node = ofw_bus_get_node(dev);

        pdata = malloc(sizeof(struct coresight_platform_data),
            M_CORESIGHT, M_WAITOK | M_ZERO);
        pdata->bus_type = CORESIGHT_BUS_FDT;

        mtx_init(&pdata->mtx_lock, "Coresight Platform Data", NULL, MTX_DEF);
        TAILQ_INIT(&pdata->endpoints);

        coresight_fdt_get_cpu(node, pdata);
        coresight_fdt_get_ports(node, pdata);

        if (bootverbose)
                printf("Total ports: in %d out %d\n",
                    pdata->in_ports, pdata->out_ports);

        return (pdata);
}