source: mainline/kernel/genarch/src/ofw/pci.c@ b60c582

/*
 * 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/drivers/pci.h>
#include <arch/trap/interrupt.h>
#include <arch/memstr.h>
#include <string.h>
#include <panic.h>
#include <macros.h>

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

#define PCI_IGN                 0x1f

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 (str_cmp(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;
        
        unsigned 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("Cannot find 'assigned-addresses' property.");
        
        assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
        assigned_address = prop->value;
        
        unsigned 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;
}

/** Map PCI interrupt.
 *
 * So far, we only know how to map interrupts of non-PCI devices connected
 * to a PCI bridge.
 */
bool
ofw_pci_map_interrupt(ofw_tree_node_t *node, ofw_pci_reg_t *reg, int ino,
    int *inr, cir_t *cir, void **cir_arg)
{
        pci_t *pci = node->device;
        if (!pci) {
                pci = pci_init(node);
                if (!pci)
                        return false;
                node->device = pci;
        }

        pci_enable_interrupt(pci, ino);

        *inr = (PCI_IGN << IGN_SHIFT) | ino;
        *cir = pci_clear_interrupt;
        *cir_arg = pci;

        return true;
}

/** @}
 */