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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 BUF_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;

ihandle ofw_stdout;

phandle ofw_root;

ihandle ofw_mmu;

phandle ofw_memory;

phandle ofw_aliases;

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

{

    va_list list;

    ofw_args_t args;

    int i;

    args.service = service;

    args.nargs = nargs;

    args.nret = nret;

    va_start(list, rets);

    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);

    for (i = 1; i < nret; i++)

        rets[i - 1] = args.args[i + nargs];

    return args.args[nargs];

}

static phandle ofw_find_device(const char *name)

{

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

}

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

{

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

}

static unsigned int ofw_get_address_cells(const phandle device)

{

    unsigned int ret;

    if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)

        if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)

            ret = 1;

    return ret;

}

static unsigned int ofw_get_size_cells(const phandle device)

{

    unsigned int ret;

    if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)

        if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)

            ret = 1;

    return ret;

}

static ihandle ofw_open(const char *name)

{

    return ofw_call("open", 1, 1, NULL, 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_root = ofw_find_device("/");

    if (ofw_root == -1) {

        puts("\r\nError: Unable to find / device, halted.\r\n");

        halt();

    }

    if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {

        puts("\r\nError: Unable to get mmu property, halted.\r\n");

        halt();

    }

    ofw_memory = ofw_find_device("/memory");

    if (ofw_memory == -1) {

        puts("\r\nError: Unable to find /memory device, halted.\r\n");

        halt();

    }

    ofw_aliases = ofw_find_device("/aliases");

    if (ofw_aliases == -1) {

        puts("\r\nError: Unable to find /aliases device, halted.\r\n");

        halt();

    }

}

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

{

    if (ofw_stdout == 0)

        return;

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

}

void *ofw_translate(const void *virt)

{

    ofw_arg_t result[3];

    if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, (unsigned long) virt, 1) != 0) {

        puts("Error: MMU method translate() failed, halting.\n");

        halt();

    }

    return (void *) (unsigned long) result[2];

}

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

{

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

}

int ofw_memmap(memmap_t *map)

{

    unsigned int buf[BUF_SIZE];

    int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(unsigned int) * BUF_SIZE);

    if (ret <= 0)

        return false;

    unsigned int ac = ofw_get_address_cells(ofw_memory);

    unsigned int sc = ofw_get_size_cells(ofw_memory);

    int pos;

    map->total = 0;

    map->count = 0;

    for (pos = 0; (pos < ret / sizeof(unsigned int)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {

        void * start = (void *) (unsigned long) buf[pos + ac - 1];

        unsigned int size = buf[pos + ac + sc - 1];

        if (size > 0) {

            map->zones[map->count].start = start;

            map->zones[map->count].size = size;

            map->count++;

            map->total += size;

        }

    }

}

int ofw_screen(screen_t *screen)

{

    char device_name[BUF_SIZE];

    if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(char) * BUF_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;

}