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Add code to deal with PCI-PCI bridge chips, especially the DEC 21050.

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Try to deduce maximum number of PCI buses in system (working around
chip set bugs).
Better check for devices at multiple addresses (aliases).

Reviewed by:	se
Submitted by:	<wolf@kintaro.cologne.de> Wolfgang Stanglmeier
This commit is contained in:
Stefan Eßer 1995-02-27 17:22:09 +00:00
parent 04dbb40865
commit c79b89e28f
1 changed files with 43 additions and 4 deletions
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47
sys/pci/pcisupport.c
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@ -1,6 +1,6 @@
/**************************************************************************
**
** $Id: pcisupport.c,v 1.8 1995/02/02 13:12:18 davidg Exp $
** $Id: pcisupport.c,v 1.9 1995/02/14 03:19:27 wollman Exp $
**
** Device driver for INTEL PCI chipsets.
**
@ -41,6 +41,7 @@
***************************************************************************
*/
#define __PCISUPPORT_C_PATCHLEVEL__ "pl2 95/02/27"
/*==========================================================
**
@ -289,6 +290,44 @@ void chipset_attach(pcici_t config_id, int unit)
/*---------------------------------------------------------
**
** Catchall driver for pci-pci bridges.
**
**---------------------------------------------------------
*/
static char* ppb_probe (pcici_t tag, pcidi_t type);
static void ppb_attach(pcici_t tag, int unit);
static u_long ppb_count;
struct pci_device ppb_device = {
"ppb",
ppb_probe,
ppb_attach,
&ppb_count
};
DATA_SET (pcidevice_set, ppb_device);
static char* ppb_probe (pcici_t tag, pcidi_t type)
{
int data = pci_conf_read(tag, PCI_CLASS_REG);
if ((data & (PCI_CLASS_MASK|PCI_SUBCLASS_MASK)) ==
(PCI_CLASS_BRIDGE|PCI_SUBCLASS_BRIDGE_PCI))
return ("PCI-PCI bridge");
return ((char*)0);
}
static void ppb_attach(pcici_t tag, int unit)
{
/*
** XXX should read bus number from device
*/
(void) pci_map_bus (tag, 1);
}
/*---------------------------------------------------------
**
** Catchall driver for VGA devices
**
**
@ -335,10 +374,10 @@ static char* vga_probe (pcici_t tag, pcidi_t type)
static void vga_attach(pcici_t tag, int unit)
{
/*
** Breaks some systems.
** The assigned adresses _have_ to be announced to the console driver.
** The assigned adresses may not be remapped,
** because certain values are assumed by the console driver.
*/
#if 0
#ifndef PCI_REMAP
vm_offset_t va;
vm_offset_t pa;
int reg;