kernel/genarch/src/ofw/pci.c

   1 /*
   2  * Copyright (c) 2006 Jakub Jermar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup ofw
  30  * @{
  31  */
  32 /**
  33  * @file
  34  * @brief       PCI 'reg' and 'ranges' properties handling.
  35  *
  36  */
  37
  38 #include <genarch/ofw/ofw_tree.h>
  39 #include <arch/drivers/pci.h>
  40 #include <arch/trap/interrupt.h>
  41 #include <arch/memstr.h>
  42 #include <func.h>
  43 #include <panic.h>
  44 #include <macros.h>
  45
  46 #define PCI_SPACE_MASK          0x03000000
  47 #define PCI_ABS_MASK            0x80000000
  48 #define PCI_REG_MASK            0x000000ff
  49
  50 #define PCI_IGN                 0x1f
  51
  52 bool ofw_pci_apply_ranges(ofw_tree_node_t *node, ofw_pci_reg_t *reg, uintptr_t *pa)
  53 {
  54         ofw_tree_property_t *prop;
  55         ofw_pci_range_t *range;
  56         count_t ranges;
  57
  58         prop = ofw_tree_getprop(node, "ranges");
  59         if (!prop) {
  60                 if (strcmp(ofw_tree_node_name(node->parent), "pci") == 0)
  61                         return ofw_pci_apply_ranges(node->parent, reg, pa);
  62                 return false;
  63         }
  64
  65         ranges = prop->size / sizeof(ofw_pci_range_t);
  66         range = prop->value;
  67
  68         int i;
  69
  70         for (i = 0; i < ranges; i++) {
  71                 if ((reg->space & PCI_SPACE_MASK) != (range[i].space & PCI_SPACE_MASK))
  72                         continue;
  73                 if (overlaps(reg->addr, reg->size, range[i].child_base, range[i].size)) {
  74                         *pa = range[i].parent_base + (reg->addr - range[i].child_base);
  75                         return true;
  76                 }
  77         }
  78
  79         return false;
  80 }
  81
  82 bool ofw_pci_reg_absolutize(ofw_tree_node_t *node, ofw_pci_reg_t *reg, ofw_pci_reg_t *out)
  83 {
  84         if (reg->space & PCI_ABS_MASK) {
  85                 /* already absolute */
  86                 out->space = reg->space;
  87                 out->addr = reg->addr;
  88                 out->size = reg->size;
  89                 return true;
  90         }
  91
  92         ofw_tree_property_t *prop;
  93         ofw_pci_reg_t *assigned_address;
  94         count_t assigned_addresses;
  95
  96         prop = ofw_tree_getprop(node, "assigned-addresses");
  97         if (!prop)
  98                 panic("Can't find \"assigned-addresses\" property.\n");
  99
 100         assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
 101         assigned_address = prop->value;
 102
 103         int i;
 104
 105         for (i = 0; i < assigned_addresses; i++) {
 106                 if ((assigned_address[i].space & PCI_REG_MASK) == (reg->space & PCI_REG_MASK)) {
 107                         out->space = assigned_address[i].space;
 108                         out->addr = reg->addr + assigned_address[i].addr;
 109                         out->size = reg->size;
 110                         return true;
 111                 }
 112         }
 113
 114         return false;
 115 }
 116
 117 /** Map PCI interrupt.
 118  *
 119  * So far, we only know how to map interrupts of non-PCI devices connected
 120  * to a PCI bridge.
 121  */
 122 bool ofw_pci_map_interrupt(ofw_tree_node_t *node, ofw_pci_reg_t *reg, int ino, int *inr)
 123 {
 124         pci_t *pci = node->device;
 125         if (!pci) {
 126                 pci = pci_init(node);
 127                 if (!pci)
 128                         return false;
 129                 node->device = pci;
 130         }
 131
 132         pci_enable_interrupt(pci, ino);
 133
 134         *inr = (PCI_IGN << IGN_SHIFT) | ino;
 135
 136         return true;
 137 }
 138
 139 /** @}
 140  */