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/*

 * Copyright (c) 2005 Martin Decky

 * Copyright (c) 2006 Jakub Jermar

 * 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.

 */

/**

 * @file

 * @brief   Architecture dependent parts of OpenFirmware interface.

 */

#include <ofwarch.h>  

#include <ofw.h>

#include <printf.h>

#include <string.h>

#include <register.h>

#include "main.h"

#include "asm.h"

/* these tho variables will be set by the detect_subarchitecture function */

extern uint8_t subarchitecture;

extern uint16_t mid_mask;

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

{

    int i;

    for (i = 0; i < len; i++) {

        if (str[i] == '\n')

            ofw_write("\r", 1);

        ofw_write(&str[i], 1);

    }

}

int ofw_translate_failed(ofw_arg_t flag)

{

    return flag != -1;

}

/**

 * Starts all CPUs represented by following siblings of the given node,

 * except for the current CPU.

 *

 * @param child     The first child of the OFW tree node whose children

 *          represent CPUs to be woken up.

 * @param current_mid   MID of the current CPU, the current CPU will

 *          (of course) not be woken up.

 * @return      Number of CPUs which have the same parent node as

 *          "child".

 */

static int wake_cpus_in_node(phandle child, uint64_t current_mid)

{

    int cpus;

    char type_name[BUF_SIZE];

    for (cpus = 0; child != 0 && child != -1;

        child = ofw_get_peer_node(child), cpus++) {

        if (ofw_get_property(child, "device_type", type_name,

            sizeof(type_name)) > 0) {

            if (strcmp(type_name, "cpu") == 0) {

                uint32_t mid;

                /*

                 * "upa-portid" for US, "portid" for US-III,

                 * "cpuid" for US-IV

                 */

                if (ofw_get_property(

                    child, "upa-portid",

                    &mid, sizeof(mid)) <= 0

                    && ofw_get_property(child, "portid",

                    &mid, sizeof(mid)) <= 0

                    && ofw_get_property(child, "cpuid",

                    &mid, sizeof(mid)) <= 0)

                    continue;

                if (current_mid != mid) {

                    /*

                     * Start secondary processor.

                     */

                    (void) ofw_call("SUNW,start-cpu", 3, 1,

                        NULL, child, KERNEL_VIRTUAL_ADDRESS,

                        bootinfo.physmem_start |

                        AP_PROCESSOR);

                }

            }

        }

    }

    return cpus;

}

/**

 * Finds out the current CPU's MID and wakes up all AP processors.

 */

int ofw_cpu(void)

{

    int cpus;

    phandle node;

    phandle subnode;

    phandle cpus_parent;

    phandle cmp;

    char name[BUF_SIZE];

    /* get the current CPU MID */

    uint64_t current_mid;

    asm volatile ("ldxa [%1] %2, %0\n"

        : "=r" (current_mid)

        : "r" (0), "i" (ASI_ICBUS_CONFIG));

    current_mid >>= ICBUS_CONFIG_MID_SHIFT;

    current_mid &= mid_mask;

    /* wake up CPUs */

    cpus_parent = ofw_find_device("/ssm@0,0");

    if (cpus_parent == 0 || cpus_parent == -1) {

        cpus_parent = ofw_find_device("/");

    }

    node = ofw_get_child_node(cpus_parent);

    cpus = wake_cpus_in_node(node, current_mid);

    while (node != 0 && node != -1) {

        if (ofw_get_property(node, "name", name,

            sizeof(name)) > 0) {

            if (strcmp(name, "cmp") == 0) {

                subnode = ofw_get_child_node(node);

                cpus += wake_cpus_in_node(subnode,

                    current_mid);

            }

        }

        node = ofw_get_peer_node(node);

    }

    return cpus;

}

/** Get physical memory starting address.

 *

 * @param start     Pointer to variable where the physical memory starting

 *          address will be stored.

 *

 * @return      Non-zero on succes, zero on failure.

 */

int ofw_get_physmem_start(uintptr_t *start)

{

    uint32_t memreg[4];

    if (ofw_get_property(ofw_memory, "reg", &memreg, sizeof(memreg)) <= 0)

        return 0;

    *start = (((uint64_t) memreg[0]) << 32) | memreg[1];

    return 1;

}