HelenOS sources

root/kernel/genarch/src/ofw/sbus.c

DEFINITIONS

1. ofw_sbus_apply_ranges

/*
 * Copyright (c) 2007 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.
 */

/** @addtogroup kernel_genarch
 * @{
 */
/**
 * @file
 * @brief       SBUS 'reg' and 'ranges' properties handling.
 *
 */

#include <genarch/ofw/ofw_tree.h>
#include <genarch/ofw/sbus.h>
#include <macros.h>

bool ofw_sbus_apply_ranges(ofw_tree_node_t *node, ofw_sbus_reg_t *reg,
    uintptr_t *pa)
{
        ofw_tree_property_t *prop;
        ofw_sbus_range_t *range;
        size_t ranges;

        /*
         * The SBUS support is very rudimentary in that we simply assume
         * that the SBUS bus in question is connected directly to the UPA bus.
         * Should we come across configurations that need more robust support,
         * the driver will have to be extended to handle different topologies.
         */
        if (!node->parent || node->parent->parent)
                return false;

        prop = ofw_tree_getprop(node, "ranges");
        if (!prop)
                return false;

        ranges = prop->size / sizeof(ofw_sbus_range_t);
        range = prop->value;

        unsigned int i;

        for (i = 0; i < ranges; i++) {
                if (overlaps(reg->addr, reg->size, range[i].child_base,
                    range[i].size)) {
                        *pa = range[i].parent_base +
                            (reg->addr - range[i].child_base);
                        return true;
                }
        }

        return false;
}

/** @}
 */