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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 <string.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
  53. ofw_pci_apply_ranges(ofw_tree_node_t *node, ofw_pci_reg_t *reg, uintptr_t *pa)
  54. {
  55.     ofw_tree_property_t *prop;
  56.     ofw_pci_range_t *range;
  57.     size_t ranges;
  58.  
  59.     prop = ofw_tree_getprop(node, "ranges");
  60.     if (!prop) {
  61.         if (str_cmp(ofw_tree_node_name(node->parent), "pci") == 0)
  62.             return ofw_pci_apply_ranges(node->parent, reg, pa);
  63.         return false;
  64.     }
  65.        
  66.     ranges = prop->size / sizeof(ofw_pci_range_t);
  67.     range = prop->value;
  68.    
  69.     unsigned int i;
  70.    
  71.     for (i = 0; i < ranges; i++) {
  72.         if ((reg->space & PCI_SPACE_MASK) !=
  73.             (range[i].space & PCI_SPACE_MASK))
  74.             continue;
  75.         if (overlaps(reg->addr, reg->size, range[i].child_base,
  76.             range[i].size)) {
  77.             *pa = range[i].parent_base +
  78.                 (reg->addr - range[i].child_base);
  79.             return true;
  80.         }
  81.     }
  82.  
  83.     return false;
  84. }
  85.  
  86. bool
  87. ofw_pci_reg_absolutize(ofw_tree_node_t *node, ofw_pci_reg_t *reg,
  88.     ofw_pci_reg_t *out)
  89. {
  90.     if (reg->space & PCI_ABS_MASK) {
  91.         /* already absolute */
  92.         out->space = reg->space;
  93.         out->addr = reg->addr;
  94.         out->size = reg->size;
  95.         return true;
  96.     }
  97.    
  98.     ofw_tree_property_t *prop;
  99.     ofw_pci_reg_t *assigned_address;
  100.     size_t assigned_addresses;
  101.    
  102.     prop = ofw_tree_getprop(node, "assigned-addresses");
  103.     if (!prop)
  104.         panic("Cannot find 'assigned-addresses' property.");
  105.    
  106.     assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
  107.     assigned_address = prop->value;
  108.    
  109.     unsigned int i;
  110.    
  111.     for (i = 0; i < assigned_addresses; i++) {
  112.         if ((assigned_address[i].space & PCI_REG_MASK) ==
  113.             (reg->space & PCI_REG_MASK)) {
  114.             out->space = assigned_address[i].space;
  115.             out->addr = reg->addr + assigned_address[i].addr;
  116.             out->size = reg->size;
  117.             return true;
  118.         }
  119.     }
  120.    
  121.     return false;
  122. }
  123.  
  124. /** Map PCI interrupt.
  125.  *
  126.  * So far, we only know how to map interrupts of non-PCI devices connected
  127.  * to a PCI bridge.
  128.  */
  129. bool
  130. ofw_pci_map_interrupt(ofw_tree_node_t *node, ofw_pci_reg_t *reg, int ino,
  131.     int *inr, cir_t *cir, void **cir_arg)
  132. {
  133.     pci_t *pci = node->device;
  134.     if (!pci) {
  135.         pci = pci_init(node);
  136.         if (!pci)
  137.             return false;
  138.         node->device = pci;
  139.     }
  140.  
  141.     pci_enable_interrupt(pci, ino);
  142.  
  143.     *inr = (PCI_IGN << IGN_SHIFT) | ino;
  144.     *cir = pci_clear_interrupt;
  145.     *cir_arg = pci;
  146.  
  147.     return true;
  148. }
  149.  
  150. /** @}
  151.  */
  152.