/* $NetBSD: cpus.c,v 1.8 2023/06/12 12:58:17 skrll Exp $ */

/*-
 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * 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 ``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 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cpus.c,v 1.8 2023/06/12 12:58:17 skrll Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kmem.h>

#include <dev/fdt/fdtvar.h>

static int      cpus_match(device_t, cfdata_t, void *);
static void     cpus_attach(device_t, device_t, void *);

static bool     cpus_cpu_enabled(int);

CFATTACH_DECL_NEW(cpus, 0, cpus_match, cpus_attach, NULL, NULL);

static int
cpus_match(device_t parent, cfdata_t cf, void *aux)
{
        struct fdt_attach_args * const faa = aux;

        return OF_finddevice("/cpus") == faa->faa_phandle;
}

static void
cpus_attach(device_t parent, device_t self, void *aux)
{
        struct fdt_attach_args * const faa = aux;
        const int phandle = faa->faa_phandle;
        int child;

        aprint_naive("\n");
        aprint_normal("\n");

        fdtbus_cpus_md_attach(parent, self, faa);

        for (child = OF_child(phandle); child; child = OF_peer(child)) {
                if (!cpus_cpu_enabled(child))
                        continue;
                fdt_add_child(self, child, faa, 0);
        }
}

static bool
cpus_cpu_enabled(int child)
{
        const char *s;

        /* Only match nodes with device_type = "cpu" */
        s = fdtbus_get_string(child, "device_type");
        if (!s || strcmp(s, "cpu") != 0)
                return false;

        /* If status is set, it must be either "okay" or "disabled" */
        s = fdtbus_get_string(child, "status");
        if (s) {
                if (strcmp(s, "okay") == 0)
                        return true;
                if (strcmp(s, "disabled") == 0)
                        return of_hasprop(child, "enable-method");
                return false;
        } else {
                return true;
        }
}