release/src-rt-6.x.4708/cfe/cfe/arch/mips/board/bcm91125c/src/bcm91125c_pci.c

   1 /*  *********************************************************************
   2     *  Broadcom Common Firmware Environment (CFE)
   3     *
   4     *  Board device initialization              File: bcm91125c_pci.c
   5     *
   6     *  This is the part of the board support package for boards
   7     *  that support PCI. It describes the board-specific slots/devices
   8     *  and wiring thereof.
   9     *
  10     *********************************************************************
  11     *
  12     *  Copyright 2000,2001,2002,2003
  13     *  Broadcom Corporation. All rights reserved.
  14     *
  15     *  This software is furnished under license and may be used and
  16     *  copied only in accordance with the following terms and
  17     *  conditions.  Subject to these conditions, you may download,
  18     *  copy, install, use, modify and distribute modified or unmodified
  19     *  copies of this software in source and/or binary form.  No title
  20     *  or ownership is transferred hereby.
  21     *
  22     *  1) Any source code used, modified or distributed must reproduce
  23     *     and retain this copyright notice and list of conditions
  24     *     as they appear in the source file.
  25     *
  26     *  2) No right is granted to use any trade name, trademark, or
  27     *     logo of Broadcom Corporation.  The "Broadcom Corporation"
  28     *     name may not be used to endorse or promote products derived
  29     *     from this software without the prior written permission of
  30     *     Broadcom Corporation.
  31     *
  32     *  3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
  33     *     IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
  34     *     WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  35     *     PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
  36     *     SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
  37     *     PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
  38     *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  39     *     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  40     *     GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  41     *     BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  42     *     OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  43     *     TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
  44     *     THE POSSIBILITY OF SUCH DAMAGE.
  45     ********************************************************************* */
  46
  47 #include "lib_types.h"
  48
  49 #include "pcireg.h"
  50 #include "pcivar.h"
  51
  52 /* PCI interrupt mapping on the BCM91125C board:
  53    Only device ids 5 and 6 are implemented as PCI connectors, and
  54    the only on-board device has id 7 (USB bridge).
  55
  56    Slot    IDSEL   DevID  INT{A,B,C,D}   shift
  57   (PHB)      -       0       {A,-,-,-}     0
  58   (LHB)      -       1       {-,-,-,-}     0
  59     0       16       5       {A,B,C,D}     0 (identity)
  60     1       17       6       {B,C,D,A}     1 (A->B, B->C, C->D, D->A)
  61   (USB)     18       7       {C,D,-,-}     2 (A->C, B->D, C->A, D->B)
  62     -                                      3 (A->D, B->A, C->B, D->C)
  63
  64    Device 1 is the LDT host bridge.  By giving it a shift of 0,
  65    the normal rotation algorithm gives the correct result for devices
  66    on the secondary bus of the LDT host bridge (bus 1).  Firmware
  67    must program the API 10ll LDT-PCI bridge so that the normal
  68    rotation algorithm gives correct results for its secondary (bus 2):
  69
  70     0       16       0       {A,B,C,D}     0 (identity)
  71     1       17       1       {B,C,D,A}     1 (A->B, B->C, C->D, D->A)
  72 */
  73
  74 extern int _pciverbose;
  75
  76 /* Return the base shift of a slot or device on the motherboard.
  77    This is board specific, for the BCM91125C board only. */
  78 uint8_t
  79 pci_int_shift_0(pcitag_t tag)
  80 {
  81     int bus, device;
  82
  83     pci_break_tag(tag, NULL, &bus, &device, NULL);
  84
  85     if (bus != 0)
  86         return 0;
  87     switch (device) {
  88     case 0:
  89         return 0;
  90     case 5: case 6: case 7:
  91         return ((device - 5) % 4);
  92     default:
  93         return 0;
  94     }
  95 }
  96
  97 /* Return the mapping of a BCM91125C device/function interrupt to an
  98    interrupt line.  For the SB-1150, return 1-4 to indicate the
  99    pci_inta - pci_intd inputs to the interrupt mapper, respectively,
 100    or 0 if there is no mapping.  This is board specific, and the
 101    version below is for BCM91125C, 32-bit slots only. */
 102 uint8_t
 103 pci_int_map_0(pcitag_t tag)
 104 {
 105     pcireg_t data;
 106     int pin, bus, device;
 107
 108     data = pci_conf_read(tag, PCI_BPARAM_INTERRUPT_REG);
 109     pin = PCI_INTERRUPT_PIN(data);
 110     if (pin == 0) {
 111         /* No IRQ used. */
 112         return 0;
 113     }
 114     if (pin > 4) {
 115         if (_pciverbose >= 1)
 116             pci_tagprintf(tag, "pci_map_int: bad interrupt pin %d\n", pin);
 117         return 0;
 118     }
 119
 120     pci_break_tag(tag, NULL, &bus, &device, NULL);
 121
 122     if (bus != 0)
 123         return 0;
 124
 125     switch (device) {
 126     case 0:
 127     case 5: case 6: case 7:
 128         return (((pin - 1) + pci_int_shift_0(tag)) % 4) + 1;
 129     default:
 130         return 0;
 131     }
 132 }