src/mainboard/axus/tc320/irq_tables.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2007 Juergen Beisert <juergen@kreuzholzen.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * Interrupt routing description for the AXUS TC320 board.
  24  * It was not possible to read back the PIRQ table. There was no BIOS to ask
  25  * for it, only a bootloader for an embedded OS.
  26  * But with the method described here:
  27  *    http://coreboot.org/Creating_Valid_IRQ_Tables
  28  * it was possible to detect the physical IRQ routing on this board.
  29  *
  30  * This is the physical routing on this board:
  31  *
  32  *    IRQ          5530       USB     Network
  33  * controller  northbridge  device     device
  34  *                          00.13.0   00.0e.00
  35  * --------------------------------------------
  36  *    11          INTA#      INTA#      n.c.
  37  *    15          INTB#       n.c.     INTA#
  38  *                INTC#       n.c.      n.c.
  39  *                INTD#       n.c.      n.c.
  40  */
  41
  42 #include <arch/pirq_routing.h>
  43
  44 #define INT_A 0x01
  45 #define INT_B 0x02
  46 #define INT_C 0x03
  47 #define INT_D 0x04
  48
  49 /*
  50  * The USB controller should be connected to IRQ11,
  51  * the network controller should be connected to IRQ15.
  52  */
  53
  54 #define IRQ_BITMAP_LINK0 0x0800
  55 #define IRQ_BITMAP_LINK1 0x8000
  56 #define IRQ_BITMAP_LINK2 0x0000
  57 #define IRQ_BITMAP_LINK3 0x0000
  58
  59 /** Reserved interrupt channels for exclusive PCI usage. */
  60 #define IRQ_DEVOTED_TO_PCI (IRQ_BITMAP_LINK0 | IRQ_BITMAP_LINK1)
  61
  62 /**
  63  * Routing description.
  64  * Documentation at: http://www.microsoft.com/whdc/archive/pciirq.mspx
  65  */
  66 const struct irq_routing_table intel_irq_routing_table = {
  67         .signature = PIRQ_SIGNATURE,    /* PIRQ signature */
  68         .version = PIRQ_VERSION,        /* PIRQ version */
  69         .size = 32 + 16 * CONFIG_IRQ_SLOT_COUNT,/* Max. CONFIG_IRQ_SLOT_COUNT devices */
  70         .rtr_bus = 0x00,                /* Interrupt router bus */
  71         .rtr_devfn = (0x12 << 3) | 0x0, /* Interrupt router device */
  72         .exclusive_irqs = IRQ_DEVOTED_TO_PCI,   /* IRQs devoted to PCI */
  73         .rtr_vendor = 0x1078,           /* Vendor */
  74         .rtr_device = 0x0100,           /* Device */
  75         .miniport_data = 0,             /* Crap (miniport) */
  76         .checksum = 0xe3,               /* Checksum */
  77         .slots = {
  78                 /*
  79                  * Definition for "slot#1". There is no real slot,
  80                  * the USB device is embedded...
  81                  */
  82                 [0] = {
  83                         .bus = 0x00,
  84                         .devfn = (0x13 << 3) | 0x0,
  85                         .irq = {
  86                                 /*      Link   Bitmap */
  87                                 [0] = { INT_A, IRQ_BITMAP_LINK0 },
  88                                 [1] = { INT_B, IRQ_BITMAP_LINK1 },
  89                                 [2] = { INT_C, IRQ_BITMAP_LINK2 },
  90                                 [3] = { INT_D, IRQ_BITMAP_LINK3 },
  91                         },
  92                         .slot = 0x0,
  93                 },
  94                 /*
  95                  * Definition for "slot#2". There is no real slot,
  96                  * the network device is soldered...
  97                  */
  98                 [1] = {
  99                         .bus = 0x00,
 100                         .devfn = (0x0e << 3) | 0x0,
 101                         .irq = {
 102                                 /*      Link   Bitmap */
 103                                 [0] = { INT_B, IRQ_BITMAP_LINK1 },
 104                                 [1] = { INT_C, IRQ_BITMAP_LINK2 },
 105                                 [2] = { INT_D, IRQ_BITMAP_LINK3 },
 106                                 [3] = { INT_A, IRQ_BITMAP_LINK0 },
 107                         },
 108                         .slot = 0x0,
 109                 }
 110         }
 111 };
 112
 113 /**
 114  * Copy the IRQ routing table to memory.
 115  *
 116  * @param[in] addr Destination address (between 0xF0000...0x100000).
 117  * @return TODO.
 118  */
 119 unsigned long write_pirq_routing_table(unsigned long addr)
 120 {
 121         return copy_pirq_routing_table(addr);
 122 }