source: mainline/kernel/genarch/src/ofw/fhc.c@ 33b1903

/*
 * 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.
 */

/** @addtogroup ofw
 * @{
 */
/**
 * @file
 * @brief       FHC 'reg' and 'ranges' properties handling.
 *
 */

#include <genarch/ofw/ofw_tree.h>
#include <arch/drivers/fhc.h>
#include <arch/memstr.h>
#include <func.h>
#include <panic.h>
#include <macros.h>

bool ofw_fhc_apply_ranges(ofw_tree_node_t *node, ofw_fhc_reg_t *reg, uintptr_t *pa)
{
        ofw_tree_property_t *prop;
        ofw_fhc_range_t *range;
        count_t ranges;

        prop = ofw_tree_getprop(node, "ranges");
        if (!prop)
                return false;
                
        ranges = prop->size / sizeof(ofw_fhc_range_t);
        range = prop->value;
        
        int i;
        
        for (i = 0; i < ranges; i++) {
                if (overlaps(reg->addr, reg->size, range[i].child_base, range[i].size)) {
                        uintptr_t addr;
                        
                        addr = range[i].parent_base + (reg->addr - range[i].child_base);
                        if (!node->parent->parent) {
                                *pa = addr;
                                return true;
                        }
                        if (strcmp(ofw_tree_node_name(node->parent), "central") != 0)
                                panic("Unexpected parent node: %s.\n", ofw_tree_node_name(node->parent));
                        
                        ofw_central_reg_t central_reg;
                        
                        central_reg.addr = addr;
                        central_reg.size = reg->size;
                        
                        return ofw_central_apply_ranges(node->parent, &central_reg, pa);
                }
        }

        return false;
}

bool ofw_central_apply_ranges(ofw_tree_node_t *node, ofw_central_reg_t *reg, uintptr_t *pa)
{
        if (node->parent->parent)
                panic("Unexpected parent node: %s.\n", ofw_tree_node_name(node->parent));
        
        ofw_tree_property_t *prop;
        ofw_central_range_t *range;
        count_t ranges;
        
        prop = ofw_tree_getprop(node, "ranges");
        if (!prop)
                return false;
                
        ranges = prop->size / sizeof(ofw_central_range_t);
        range = prop->value;
        
        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;
}

bool ofw_fhc_map_interrupt(ofw_tree_node_t *node, ofw_fhc_reg_t *reg, uint32_t interrupt, int *inr)
{
        fhc_t *fhc = NULL;
        if (!node->device) {
                fhc = fhc_init(node);
                if (!fhc)
                        return false;
                node->device = fhc;
                central_fhc = fhc;
        }
        
        /*
         * The interrupt controller for the interrupt is the FHC itself.
         */
        fhc_enable_interrupt(fhc, interrupt);
        
        *inr = interrupt;
        return true;
}

/** @}
 */