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/*
 * 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   PCI 'reg' and 'ranges' properties handling.
 *
 */

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

#define PCI_SPACE_MASK      0x03000000
#define PCI_ABS_MASK        0x80000000  
#define PCI_REG_MASK        0x000000ff

bool ofw_pci_apply_ranges(ofw_tree_node_t *node, ofw_pci_reg_t *reg, uintptr_t *pa)
{
    ofw_tree_property_t *prop;
    ofw_pci_range_t *range;
    count_t ranges;

    prop = ofw_tree_getprop(node, "ranges");
    if (!prop) {
        if (strcmp(ofw_tree_node_name(node->parent), "pci") == 0)
            return ofw_pci_apply_ranges(node->parent, reg, pa);
        return false;
    }
        
    ranges = prop->size / sizeof(ofw_pci_range_t);
    range = prop->value;
    
    int i;
    
    for (i = 0; i < ranges; i++) {
        if ((reg->space & PCI_SPACE_MASK) != (range[i].space & PCI_SPACE_MASK))
            continue;
        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_pci_reg_absolutize(ofw_tree_node_t *node, ofw_pci_reg_t *reg, ofw_pci_reg_t *out)
{
    if (reg->space & PCI_ABS_MASK) {
        /* already absolute */
        out->space = reg->space;
        out->addr = reg->addr;
        out->size = reg->size;
        return true;
    }
    
    ofw_tree_property_t *prop;
    ofw_pci_reg_t *assigned_address;
    count_t assigned_addresses;
    
    prop = ofw_tree_getprop(node, "assigned-addresses");
    if (!prop)
        panic("Can't find \"assigned-addresses\" property.\n");
    
    assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
    assigned_address = prop->value;
    
    int i;
    
    for (i = 0; i < assigned_addresses; i++) {
        if ((assigned_address[i].space & PCI_REG_MASK) == (reg->space & PCI_REG_MASK)) {
            out->space = assigned_address[i].space;
            out->addr = reg->addr + assigned_address[i].addr;
            out->size = reg->size;
            return true;
        }
    }
    
    return false;
}

/** @}
 */