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2003-11-01 Greg Menke <gregory.menke@gsfc.nasa.gov>

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PR 608/bsps
	* pci/pcibios.c: BusCountPCI().
This commit is contained in:
Joel Sherrill
2004-09-27 21:49:18 +00:00
parent 5ef84356b8
commit dd7db0f74e
2 changed files with 63 additions and 0 deletions
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5
c/src/lib/libbsp/i386/shared/ChangeLog
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@@ -1,3 +1,8 @@
2003-11-01 Greg Menke <gregory.menke@gsfc.nasa.gov>
PR 608/bsps
* pci/pcibios.c: BusCountPCI().
2003-12-29 Ralf Corsepius <corsepiu@faw.uni-ulm.de>
* shared/io/Makefile.am: Remove (Unused).

58
c/src/lib/libbsp/i386/shared/pci/pcibios.c
View File

@@ -218,6 +218,64 @@ pcib_find_by_class(int classCode, int idx, int *sig)
#define PCI_MAX_DEVICES 16
#define PCI_MAX_FUNCTIONS 8
#define PCI_VENDOR_ID 0x00 /* 16 bits */
#define PCI_DEVICE_ID 0x02 /* 16 bits */
#define PCI_CLASS_REVISION 0x08
#define PCI_HEADER_TYPE 0x0e
#define PCI_SUBORDINATE_BUS 0x1a
#define PCI_CLASS_BRIDGE_PCI 0x0604
static unsigned8 ucBusCount = 0xff;
int
BusCountPCI()
{
if( ucBusCount == 0xff )
{
unsigned char bus,dev,hd;
unsigned int d;
int sig;
ucBusCount = 0;
for(bus=0; bus< 0xff; bus++)
{
for(dev=0; dev<PCI_MAX_DEVICES; dev++)
{
sig = PCIB_DEVSIG_MAKE(bus,dev,0);
pcib_conf_read32(sig, PCI_VENDOR_ID, &d);
if( d != -1 )
{
pcib_conf_read32(sig, PCI_CLASS_REVISION, &d);
if( (d >> 16) == PCI_CLASS_BRIDGE_PCI )
{
pcib_conf_read8(sig, PCI_SUBORDINATE_BUS, &hd);
if( hd > ucBusCount )
ucBusCount = hd;
}
}
}
}
if( ucBusCount == 0 )
{
printk("BusCountPCI() found 0 busses, assuming 1\n");
ucBusCount = 1;
}
else if( ucBusCount == 0xff )
{
printk("BusCountPCI() found 0xff busses, assuming 1\n");
ucBusCount = 1;
}
}
return ucBusCount;
}
int
BSP_pciFindDevice( unsigned short vendorid, unsigned short deviceid,