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2510 jermar 1
/*
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 * Copyright (c) 2007 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ofw
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 * @{
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 */
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/**
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 * @file
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 * @brief   SBUS 'reg' and 'ranges' properties handling.
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 *
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 */
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#include <genarch/ofw/ofw_tree.h>
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#include <macros.h>
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bool ofw_sbus_apply_ranges(ofw_tree_node_t *node, ofw_sbus_reg_t *reg,
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    uintptr_t *pa)
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{
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    ofw_tree_property_t *prop;
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    ofw_sbus_range_t *range;
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    count_t ranges;
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    /*
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     * The SBUS support is very rudimentary in that we simply assume
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     * that the SBUS bus in question is connected directly to the UPA bus.
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     * Should we come across configurations that need more robust support,
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     * the driver will have to be extended to handle different topologies.
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     */
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    if (!node->parent || node->parent->parent)
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        return false;
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    prop = ofw_tree_getprop(node, "ranges");
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    if (!prop)
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        return false;
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    ranges = prop->size / sizeof(ofw_sbus_range_t);
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    range = prop->value;
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2745 decky 64
    unsigned int i;
2510 jermar 65
 
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    for (i = 0; i < ranges; i++) {
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        if (overlaps(reg->addr, reg->size, range[i].child_base,
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            range[i].size)) {
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            *pa = range[i].parent_base +
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                (reg->addr - range[i].child_base);
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            return true;
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        }
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    }
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    return false;
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}
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/** @}
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 */