forked from Minki/linux
5707b24a50
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>
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
/*
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* legacy.c - traditional, old school PCI bus probing
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <asm/pci_x86.h>
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/*
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* Discover remaining PCI buses in case there are peer host bridges.
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* We use the number of last PCI bus provided by the PCI BIOS.
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*/
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static void __devinit pcibios_fixup_peer_bridges(void)
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{
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int n;
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if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
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return;
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DBG("PCI: Peer bridge fixup\n");
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for (n=0; n <= pcibios_last_bus; n++)
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pcibios_scan_specific_bus(n);
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}
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int __init pci_legacy_init(void)
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{
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if (!raw_pci_ops) {
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printk("PCI: System does not support PCI\n");
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return 0;
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}
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printk("PCI: Probing PCI hardware\n");
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pci_root_bus = pcibios_scan_root(0);
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if (pci_root_bus)
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pci_bus_add_devices(pci_root_bus);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pci_legacy_init);
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void pcibios_scan_specific_bus(int busn)
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{
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int devfn;
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long node;
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u32 l;
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if (pci_find_bus(0, busn))
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return;
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node = get_mp_bus_to_node(busn);
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for (devfn = 0; devfn < 256; devfn += 8) {
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if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
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l != 0x0000 && l != 0xffff) {
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DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
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printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn);
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pci_scan_bus_on_node(busn, &pci_root_ops, node);
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return;
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}
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}
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}
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int __init pci_subsys_init(void)
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{
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/*
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* The init function returns an non zero value when
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* pci_legacy_init should be invoked.
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*/
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if (x86_init.pci.init())
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pci_legacy_init();
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pcibios_fixup_peer_bridges();
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x86_init.pci.init_irq();
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pcibios_init();
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return 0;
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}
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subsys_initcall(pci_subsys_init);
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