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  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/memstr.h>
  40. #include <func.h>
  41. #include <panic.h>
  42. #include <macros.h>
  43.  
  44. #define PCI_SPACE_MASK      0x03000000
  45. #define PCI_ABS_MASK        0x80000000 
  46. #define PCI_REG_MASK        0x000000ff
  47.  
  48. bool ofw_pci_apply_ranges(ofw_tree_node_t *node, ofw_pci_reg_t *reg, uintptr_t *pa)
  49. {
  50.     ofw_tree_property_t *prop;
  51.     ofw_pci_range_t *range;
  52.     count_t ranges;
  53.  
  54.     prop = ofw_tree_getprop(node, "ranges");
  55.     if (!prop) {
  56.         if (strcmp(ofw_tree_node_name(node->parent), "pci") == 0)
  57.             return ofw_pci_apply_ranges(node->parent, reg, pa);
  58.         return false;
  59.     }
  60.        
  61.     ranges = prop->size / sizeof(ofw_pci_range_t);
  62.     range = prop->value;
  63.    
  64.     int i;
  65.    
  66.     for (i = 0; i < ranges; i++) {
  67.         if ((reg->space & PCI_SPACE_MASK) != (range[i].space & PCI_SPACE_MASK))
  68.             continue;
  69.         if (overlaps(reg->addr, reg->size, range[i].child_base, range[i].size)) {
  70.             *pa = range[i].parent_base + (reg->addr - range[i].child_base);
  71.             return true;
  72.         }
  73.     }
  74.  
  75.     return false;
  76. }
  77.  
  78. bool ofw_pci_reg_absolutize(ofw_tree_node_t *node, ofw_pci_reg_t *reg, ofw_pci_reg_t *out)
  79. {
  80.     if (reg->space & PCI_ABS_MASK) {
  81.         /* already absolute */
  82.         out->space = reg->space;
  83.         out->addr = reg->addr;
  84.         out->size = reg->size;
  85.         return true;
  86.     }
  87.    
  88.     ofw_tree_property_t *prop;
  89.     ofw_pci_reg_t *assigned_address;
  90.     count_t assigned_addresses;
  91.    
  92.     prop = ofw_tree_getprop(node, "assigned-addresses");
  93.     if (!prop)
  94.         panic("Can't find \"assigned-addresses\" property.\n");
  95.    
  96.     assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
  97.     assigned_address = prop->value;
  98.    
  99.     int i;
  100.    
  101.     for (i = 0; i < assigned_addresses; i++) {
  102.         if ((assigned_address[i].space & PCI_REG_MASK) == (reg->space & PCI_REG_MASK)) {
  103.             out->space = assigned_address[i].space;
  104.             out->addr = reg->addr + assigned_address[i].addr;
  105.             out->size = reg->size;
  106.             return true;
  107.         }
  108.     }
  109.    
  110.     return false;
  111. }
  112.  
  113. /** @}
  114.  */
  115.