source: mainline/kernel/genarch/src/ofw/ebus.c

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

#include <assert.h>
#include <genarch/ofw/ofw_tree.h>
#include <genarch/ofw/ebus.h>
#include <genarch/ofw/pci.h>
#include <str.h>
#include <panic.h>
#include <macros.h>

/** Apply EBUS ranges to EBUS register. */
bool
ofw_ebus_apply_ranges(ofw_tree_node_t *node, ofw_ebus_reg_t *reg, uintptr_t *pa)
{
        ofw_tree_property_t *prop;
        ofw_ebus_range_t *range;
        size_t ranges;

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

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

        unsigned int i;

        for (i = 0; i < ranges; i++) {
                if (reg->space != range[i].child_space)
                        continue;
                if (overlaps(reg->addr, reg->size, range[i].child_base,
                    range[i].size)) {
                        ofw_pci_reg_t pci_reg;

                        pci_reg.space = range[i].parent_space;
                        pci_reg.addr = range[i].parent_base +
                            (reg->addr - range[i].child_base);
                        pci_reg.size = reg->size;

                        return ofw_pci_apply_ranges(node->parent, &pci_reg, pa);
                }
        }

        return false;
}

bool
ofw_ebus_map_interrupt(ofw_tree_node_t *node, ofw_ebus_reg_t *reg,
    uint32_t interrupt, int *inr, cir_t *cir, void **cir_arg)
{
        ofw_tree_property_t *prop;
        ofw_tree_node_t *controller;

        prop = ofw_tree_getprop(node, "interrupt-map");
        if (!prop || !prop->value)
                return false;

        ofw_ebus_intr_map_t *intr_map = prop->value;
        size_t count = prop->size / sizeof(ofw_ebus_intr_map_t);

        assert(count);

        prop = ofw_tree_getprop(node, "interrupt-map-mask");
        if (!prop || !prop->value)
                return false;

        ofw_ebus_intr_mask_t *intr_mask = prop->value;

        assert(prop->size == sizeof(ofw_ebus_intr_mask_t));

        uint32_t space = reg->space & intr_mask->space_mask;
        uint32_t addr = reg->addr & intr_mask->addr_mask;
        uint32_t intr = interrupt & intr_mask->intr_mask;

        unsigned int i;
        for (i = 0; i < count; i++) {
                if ((intr_map[i].space == space) &&
                    (intr_map[i].addr == addr) && (intr_map[i].intr == intr))
                        goto found;
        }
        return false;

found:
        /*
         * We found the device that functions as an interrupt controller
         * for the interrupt. We also found partial mapping from interrupt to
         * INO.
         */

        controller = ofw_tree_find_node_by_handle(ofw_tree_lookup("/"),
            intr_map[i].controller_handle);
        if (!controller)
                return false;

        if (str_cmp(ofw_tree_node_name(controller), "pci") != 0) {
                /*
                 * This is not a PCI node.
                 */
                return false;
        }

        /*
         * Let the PCI do the next step in mapping the interrupt.
         */
        if (!ofw_pci_map_interrupt(controller, NULL, intr_map[i].controller_ino,
            inr, cir, cir_arg))
                return false;

        return true;
}

/** @}
 */