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authorAristeu Rozanski <aris@redhat.com>2009-07-09 22:21:13 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-05-10 11:44:51 -0300
commit5707b24a50b40582226618c56692af932db9fe02 (patch)
tree63d843d6fe6ea3c414b142363188889bf90569e0
parente9bd2e73793bf0f7fcd8f94b532bb8f5c5b44171 (diff)
downloadop-kernel-dev-5707b24a50b40582226618c56692af932db9fe02.zip
op-kernel-dev-5707b24a50b40582226618c56692af932db9fe02.tar.gz
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>
-rw-r--r--arch/x86/include/asm/pci_x86.h2
-rw-r--r--arch/x86/pci/legacy.c42
2 files changed, 27 insertions, 17 deletions
diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 1a04223..ff5404b 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -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 {
diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index 0db5eaf..c734c27 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -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)
{
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