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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/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.  */
  141.