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1896 jermar 1 
/*
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 * Copyright (c) 2006 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   PCI '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 <arch/drivers/pci.h>
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#include <arch/trap/interrupt.h>
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#include <arch/memstr.h>
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#include <string.h>
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#include <panic.h>
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#include <macros.h>
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#define PCI_SPACE_MASK      0x03000000
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#define PCI_ABS_MASK        0x80000000 
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#define PCI_REG_MASK        0x000000ff
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#define PCI_IGN         0x1f
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bool
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ofw_pci_apply_ranges(ofw_tree_node_t *node, ofw_pci_reg_t *reg, uintptr_t *pa)
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{
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    ofw_tree_property_t *prop;
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    ofw_pci_range_t *range;
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    count_t ranges;
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    prop = ofw_tree_getprop(node, "ranges");
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    if (!prop) {
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        if (str_cmp(ofw_tree_node_name(node->parent), "pci") == 0)
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            return ofw_pci_apply_ranges(node->parent, reg, pa);
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        return false;
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    }
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    ranges = prop->size / sizeof(ofw_pci_range_t);
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    range = prop->value;
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    unsigned int i;
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    for (i = 0; i < ranges; i++) {
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        if ((reg->space & PCI_SPACE_MASK) !=
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            (range[i].space & PCI_SPACE_MASK))
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            continue;
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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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bool
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ofw_pci_reg_absolutize(ofw_tree_node_t *node, ofw_pci_reg_t *reg,
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    ofw_pci_reg_t *out)
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{
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    if (reg->space & PCI_ABS_MASK) {
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        /* already absolute */
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        out->space = reg->space;
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        out->addr = reg->addr;
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        out->size = reg->size;
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        return true;
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    }
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    ofw_tree_property_t *prop;
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    ofw_pci_reg_t *assigned_address;
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    count_t assigned_addresses;
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    prop = ofw_tree_getprop(node, "assigned-addresses");
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    if (!prop)
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        panic("Cannot find 'assigned-addresses' property.");
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    assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
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    assigned_address = prop->value;
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    unsigned int i;
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    for (i = 0; i < assigned_addresses; i++) {
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        if ((assigned_address[i].space & PCI_REG_MASK) ==
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            (reg->space & PCI_REG_MASK)) {
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            out->space = assigned_address[i].space;
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            out->addr = reg->addr + assigned_address[i].addr;
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            out->size = reg->size;
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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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/** Map PCI interrupt.
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 *
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 * So far, we only know how to map interrupts of non-PCI devices connected
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 * to a PCI bridge.
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 */
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bool
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ofw_pci_map_interrupt(ofw_tree_node_t *node, ofw_pci_reg_t *reg, int ino,
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    int *inr, cir_t *cir, void **cir_arg)
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{
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    pci_t *pci = node->device;
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    if (!pci) {
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        pci = pci_init(node);
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        if (!pci)
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            return false;
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        node->device = pci;
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    }
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    pci_enable_interrupt(pci, ino);
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    *inr = (PCI_IGN << IGN_SHIFT) | ino;
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    *cir = pci_clear_interrupt;
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    *cir_arg = pci;
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    return true;
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}
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/** @}
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 */