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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 <ofwarch.h>

#include <printf.h>

#include <asm.h>

#include <types.h>

uintptr_t ofw_cif;

phandle ofw_chosen;

ihandle ofw_stdout;

phandle ofw_root;

ihandle ofw_mmu;

ihandle ofw_memory_prop;

phandle ofw_memory;

phandle ofw_aliases;

void ofw_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();

    }

    if (ofw_get_property(ofw_chosen, "memory", &ofw_memory_prop,

        sizeof(ofw_memory_prop)) <= 0) {

        puts("\r\nError: Unable to get memory 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();

    }

}

/** Perform a call to OpenFirmware client interface.

 *

 * @param service   String identifying the service requested.

 * @param nargs     Number of input arguments.

 * @param nret      Number of output arguments. This includes the return

 *          value.

 * @param rets      Buffer for output arguments or NULL. The buffer must

 *          accommodate nret - 1 items.

 *

 * @return      Return value returned by the client interface.

 */

unsigned long

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 = (ofw_arg_t) 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;

    (void) ofw(&args);

    for (i = 1; i < nret; i++)

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

    return args.args[nargs];

}

phandle ofw_find_device(const char *name)

{

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

}

int

ofw_get_property(const phandle device, const char *name, void *buf,

    const int buflen)

{

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

}

int ofw_get_proplen(const phandle device, const char *name)

{

    return ofw_call("getproplen", 2, 1, NULL, device, name);

}

int ofw_next_property(const phandle device, char *previous, char *buf)

{

    return ofw_call("nextprop", 3, 1, NULL, device, previous, buf);

}

int ofw_package_to_path(const phandle device, char *buf, const int buflen)

{

    return ofw_call("package-to-path", 3, 1, NULL, device, buf, buflen);

}

unsigned int ofw_get_address_cells(const phandle device)

{

    unsigned int ret = 1;

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

        if (ofw_get_property(ofw_root, "#address-cells", &ret,

            sizeof(ret)) <= 0)

            ret = OFW_ADDRESS_CELLS;

    return ret;

}

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 = OFW_SIZE_CELLS;

    return ret;

}

phandle ofw_get_child_node(const phandle node)

{

    return ofw_call("child", 1, 1, NULL, node);

}

phandle ofw_get_peer_node(const phandle node)

{

    return ofw_call("peer", 1, 1, NULL, node);

}

static ihandle ofw_open(const char *name)

{

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

}

void ofw_write(const char *str, const int 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[4];

    int shift;

    if (ofw_call("call-method", 4, 5, result, "translate", ofw_mmu,

        virt, 0) != 0) {

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

        halt();

    }

    if (ofw_translate_failed(result[0]))

        return NULL;

    if (sizeof(unative_t) == 8)

        shift = 32;

    else

        shift = 0;

    return (void *) ((result[2] << shift) | result[3]);

}

void *ofw_claim_virt(const void *virt, const int len)

{

    ofw_arg_t retaddr;

    if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len,

        virt) != 0) {

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

        halt();

    }

    return (void *) retaddr;

}

void *ofw_claim_phys(const void *phys, const int len)

{

    ofw_arg_t retaddr[2];

    int shift;

    if (sizeof(unative_t) == 8) {

        shift = 32;

        if (ofw_call("call-method", 6, 3, retaddr, "claim",

            ofw_memory_prop, 0, len, ((uintptr_t) phys) >> shift,

            ((uintptr_t) phys) & ((uint32_t) -1)) != 0) {

            /*

             * Note that this will help us to discover

             * conflicts between OpenFirmware allocations

             * and our use of physical memory.

             * It is better to detect collisions here

             * than to cope with weird errors later.

             *

             * So this is really not to make the loader

             * more generic; it is here for debugging

             * purposes.

             */

            puts("Error: memory method claim() failed, halting.\n");

            halt();

        }

    } else {

        shift = 0;

        /*

         * FIXME: the number of arguments is probably different...

         */

        puts("Error: 32-bit ofw_claim_phys not implemented.\n");

        halt();

    }

    return (void *) ((retaddr[0] << shift) | retaddr[1]);

}

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

{

    uintptr_t phys_hi, phys_lo;

    if (sizeof(unative_t) == 8) {

        int shift = 32;

        phys_hi = (uintptr_t) phys >> shift;

        phys_lo = (uintptr_t) phys & 0xffffffff;

    } else {

        phys_hi = 0;

        phys_lo = (uintptr_t) phys;

    }

    return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size,

        virt, phys_hi, phys_lo);

}

/** Save OpenFirmware physical memory map.

 *

 * @param map Memory map structure where the map will be saved.

 *

 * @return Zero on failure, non-zero on success.

 */

int ofw_memmap(memmap_t *map)

{

    unsigned int ac = ofw_get_address_cells(ofw_memory) /

        (sizeof(uintptr_t) / sizeof(uint32_t));

    unsigned int sc = ofw_get_size_cells(ofw_memory) /

        (sizeof(uintptr_t) / sizeof(uint32_t));

    uintptr_t buf[((ac + sc) * MEMMAP_MAX_RECORDS)];

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

    if (ret <= 0)       /* ret is the number of written bytes */

        return false;

    int pos;

    map->total = 0;

    map->count = 0;

    for (pos = 0; (pos < ret / sizeof(uintptr_t)) &&

        (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {

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

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

        /*

         * This is a hot fix of the issue which occurs on machines

         * where there are holes in the physical memory (such as

         * SunBlade 1500). Should we detect a hole in the physical

         * memory, we will ignore any memory detected behind

         * the hole and pretend the hole does not exist.

         */

        if ((map->count > 0) && (map->zones[map->count - 1].start +

            map->zones[map->count - 1].size < start))

            break;

        if (size > 0) {

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

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

            map->count++;

            map->total += size;

        }

    }

    return true;

}

int ofw_screen(screen_t *screen)

{

    char device_name[BUF_SIZE];

    uint32_t virtaddr;

    if (ofw_get_property(ofw_aliases, "screen", device_name,

        sizeof(device_name)) <= 0)

        return false;

    phandle device = ofw_find_device(device_name);

    if (device == -1)

        return false;

    if (ofw_get_property(device, "address", &virtaddr,

        sizeof(virtaddr)) <= 0)

        return false;

    screen->addr = (void *) ((uintptr_t) virtaddr);

    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;

}

/**

 * Sets up the palette for the 8-bit color depth configuration so that the

 * 3:2:3 color scheme can be used. Checks that setting the palette makes sense

 * (appropriate nodes exist in the OBP tree and the color depth is not greater

 * than 8).

 *

 * @return  true if the palette has been set, false otherwise

 */

int setup_palette(void)

{

    char device_name[BUF_SIZE];

    /* resolve alias */

    if (ofw_get_property(ofw_aliases, "screen", device_name,

        sizeof(device_name)) <= 0)

        return false;

    /* for depth greater than 8 it makes no sense to set up the palette */

    uint32_t depth;

    phandle device = ofw_find_device(device_name);

    if (device == -1)

        return false;

    if (ofw_get_property(device, "depth", &depth, sizeof(uint32_t)) <= 0)

        return false;

    if (depth != 8)

        return false;

    /* required in order to be able to make a method call */

    ihandle screen = ofw_open(device_name);

    if (screen == -1)

        return false;

    /* setup the palette so that the (inverted) 3:2:3 scheme is usable */

    unsigned int i;

    for (i = 0; i < 256; i++)

        if (ofw_call("call-method", 6, 1, NULL, "color!", screen,

            255 - i,

            i << 5,

            (i >> 3) << 6,

            (i >> 5) << 5) != 0);

    return true;

}

void ofw_quiesce(void)

{

    ofw_call("quiesce", 0, 0, NULL);

}