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  1. /*
  2.  * Copyright (c) 2007 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   SBUS 'reg' and 'ranges' properties handling.
  35.  *
  36.  */
  37.  
  38. #include <genarch/ofw/ofw_tree.h>
  39. #include <macros.h>
  40.  
  41. bool ofw_sbus_apply_ranges(ofw_tree_node_t *node, ofw_sbus_reg_t *reg,
  42.     uintptr_t *pa)
  43. {
  44.     ofw_tree_property_t *prop;
  45.     ofw_sbus_range_t *range;
  46.     count_t ranges;
  47.    
  48.     /*
  49.      * The SBUS support is very rudimentary in that we simply assume
  50.      * that the SBUS bus in question is connected directly to the UPA bus.
  51.      * Should we come across configurations that need more robust support,
  52.      * the driver will have to be extended to handle different topologies.
  53.      */
  54.     if (!node->parent || node->parent->parent)
  55.         return false;
  56.    
  57.     prop = ofw_tree_getprop(node, "ranges");
  58.     if (!prop)
  59.         return false;
  60.        
  61.     ranges = prop->size / sizeof(ofw_sbus_range_t);
  62.     range = prop->value;
  63.    
  64.     unsigned int i;
  65.    
  66.     for (i = 0; i < ranges; i++) {
  67.         if (overlaps(reg->addr, reg->size, range[i].child_base,
  68.             range[i].size)) {
  69.             *pa = range[i].parent_base +
  70.                 (reg->addr - range[i].child_base);
  71.             return true;
  72.         }
  73.     }
  74.    
  75.     return false;
  76. }
  77.  
  78. /** @}
  79.  */
  80.