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/*

 * Copyright (C) 2005 Martin Decky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * 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 "ofw.h"

#include "asm.h"

#include "printf.h"

#define MAX_OFW_ARGS    10

#define STRING_SIZE     1024

typedef unsigned int ofw_arg_t;

typedef unsigned int ihandle;

typedef unsigned int phandle;

/** OpenFirmware command structure

 *

 */

typedef struct {

    const char *service;          /**< Command name */

    unsigned int nargs;           /**< Number of in arguments */

    unsigned int nret;            /**< Number of out arguments */

    ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */

} ofw_args_t;

typedef void (*ofw_entry)(ofw_args_t *);

ofw_entry ofw;

phandle ofw_chosen;

phandle ofw_aliases;

ihandle ofw_mmu;

ihandle ofw_stdout;

static int ofw_call(const char *service, const int nargs, const int nret, ...)

{

    va_list list;

    ofw_args_t args;

    int i;

    args.service = service;

    args.nargs = nargs;

    args.nret = nret;

    va_start(list, nret);

    for (i = 0; i < nargs; i++)

        args.args[i] = va_arg(list, ofw_arg_t);

    va_end(list);

    for (i = 0; i < nret; i++)

        args.args[i + nargs] = 0;

    ofw(&args);

    return args.args[nargs];

}

static phandle ofw_find_device(const char *name)

{

    return ofw_call("finddevice", 1, 1, name);

}

static int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)

{

    return ofw_call("getprop", 4, 1, device, name, buf, buflen);

}

static ihandle ofw_open(const char *name)

{

    return ofw_call("open", 1, 1, name);

}

void init(void)

{

    ofw_chosen = ofw_find_device("/chosen");

    if (ofw_chosen == -1)

        halt();

    if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0) 

        ofw_stdout = 0;

    ofw_aliases = ofw_find_device("/aliases");

    if (ofw_aliases == -1) {

        puts("\nUnable to find /aliases device\n");

        halt();

    }

    ofw_mmu = ofw_open("/mmu");

    if (ofw_mmu == -1) {

        puts("\nUnable to open /mmu node\n");

        halt();

    }

}

void ofw_write(const char *str, const int len)

{

    if (ofw_stdout == 0)

        return;

    ofw_call("write", 3, 1, ofw_stdout, str, len);

}

void *ofw_translate(const void *virt)

{

    return (void *) ofw_call("call-method", 7, 1, "translate", ofw_mmu, virt, 0, 0, 0, 0);

}

int ofw_map(const void *phys, const void *virt, const int size, const int mode)

{

    return ofw_call("call-method", 6, 1, "map", ofw_mmu, mode, size, virt, phys);

}

int ofw_memmap(memmap_t *map)

{

    int i;

    int ret;

    phandle handle = ofw_find_device("/memory");

    if (handle == -1)

        return false;

    ret = ofw_get_property(handle, "reg", &map->zones, sizeof(map->zones));

    if (ret == -1)

        return false;

    map->total = 0;

    map->count = 0;

    for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {

        if (map->zones[i].size == 0)

            break;

        map->count++;

        map->total += map->zones[i].size;

    }

}

int ofw_screen(screen_t *screen)

{

    char device_name[STRING_SIZE];

    if (ofw_get_property(ofw_aliases, "screen", device_name, STRING_SIZE) <= 0)

        return false;

    phandle device = ofw_find_device(device_name);

    if (device == -1)

        return false;

    if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)

        return false;

    if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)

        return false;

    if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)

        return false;

    if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)

        return false;

    if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)

        return false;

    return true;

}