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pci: Add a probing code that seeks for an specific bus 

This patch adds a probing code that seeks for an specific pci bus. It
still needs testing, but it is hoped that this will help to identify the
memory controller with Xeon 55xx series.

Signed-off-by: Aristeu Sergio <arozansk@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Aristeu Rozanski 2009-07-09 22:21:13 -03:00 committed by Mauro Carvalho Chehab
parent e9bd2e7379
commit 5707b24a50
2 changed files with 27 additions and 17 deletions
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2
arch/x86/include/asm/pci_x86.h
View File

@ -53,6 +53,8 @@ extern int pcibios_last_bus;
extern struct pci_bus *pci_root_bus;
extern struct pci_ops pci_root_ops;
void pcibios_scan_specific_bus(int busn);
/* pci-irq.c */
struct irq_info {

42
arch/x86/pci/legacy.c
View File

@ -11,28 +11,14 @@
*/
static void __devinit pcibios_fixup_peer_bridges(void)
{
int n, devfn;
long node;
int n;
if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
return;
DBG("PCI: Peer bridge fixup\n");
for (n=0; n <= pcibios_last_bus; n++) {
u32 l;
if (pci_find_bus(0, n))
continue;
node = get_mp_bus_to_node(n);
for (devfn = 0; devfn < 256; devfn += 8) {
if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
l != 0x0000 && l != 0xffff) {
DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
pci_scan_bus_on_node(n, &pci_root_ops, node);
break;
}
}
}
for (n=0; n <= pcibios_last_bus; n++)
pcibios_scan_specific_bus(n);
}
int __init pci_legacy_init(void)
@ -49,6 +35,28 @@ int __init pci_legacy_init(void)
return 0;
}
EXPORT_SYMBOL_GPL(pci_legacy_init);
void pcibios_scan_specific_bus(int busn)
{
int devfn;
long node;
u32 l;
if (pci_find_bus(0, busn))
return;
node = get_mp_bus_to_node(busn);
for (devfn = 0; devfn < 256; devfn += 8) {
if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
l != 0x0000 && l != 0xffff) {
DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn);
pci_scan_bus_on_node(busn, &pci_root_ops, node);
return;
}
}
}
int __init pci_subsys_init(void)
{