1/*
 2 * legacy.c - traditional, old school PCI bus probing
 3 */
 4#include <linux/init.h>
 
 5#include <linux/pci.h>
 
 6#include <asm/pci_x86.h>
 7
 8/*
 9 * Discover remaining PCI buses in case there are peer host bridges.
10 * We use the number of last PCI bus provided by the PCI BIOS.
11 */
12static void __devinit pcibios_fixup_peer_bridges(void)
13{
14	int n;
15
16	if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
17		return;
18	DBG("PCI: Peer bridge fixup\n");
19
20	for (n=0; n <= pcibios_last_bus; n++)
21		pcibios_scan_specific_bus(n);
22}
23
24int __init pci_legacy_init(void)
25{
26	if (!raw_pci_ops) {
27		printk("PCI: System does not support PCI\n");
28		return 0;
29	}
30
31	printk("PCI: Probing PCI hardware\n");
32	pci_root_bus = pcibios_scan_root(0);
33	if (pci_root_bus)
34		pci_bus_add_devices(pci_root_bus);
35
 
 
36	return 0;
37}
38
39void __devinit pcibios_scan_specific_bus(int busn)
40{
 
41	int devfn;
42	long node;
43	u32 l;
44
45	if (pci_find_bus(0, busn))
46		return;
47
48	node = get_mp_bus_to_node(busn);
49	for (devfn = 0; devfn < 256; devfn += 8) {
50		if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
51		    l != 0x0000 && l != 0xffff) {
52			DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
53			printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn);
54			pci_scan_bus_on_node(busn, &pci_root_ops, node);
55			return;
56		}
57	}
58}
59EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus);
60
61int __init pci_subsys_init(void)
62{
63	/*
64	 * The init function returns an non zero value when
65	 * pci_legacy_init should be invoked.
66	 */
67	if (x86_init.pci.init())
68		pci_legacy_init();
 
 
 
 
69
70	pcibios_fixup_peer_bridges();
71	x86_init.pci.init_irq();
72	pcibios_init();
73
74	return 0;
75}
76subsys_initcall(pci_subsys_init);

 1/*
 2 * legacy.c - traditional, old school PCI bus probing
 3 */
 4#include <linux/init.h>
 5#include <linux/export.h>
 6#include <linux/pci.h>
 7#include <asm/jailhouse_para.h>
 8#include <asm/pci_x86.h>
 9
10/*
11 * Discover remaining PCI buses in case there are peer host bridges.
12 * We use the number of last PCI bus provided by the PCI BIOS.
13 */
14static void pcibios_fixup_peer_bridges(void)
15{
16	int n;
17
18	if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
19		return;
20	DBG("PCI: Peer bridge fixup\n");
21
22	for (n=0; n <= pcibios_last_bus; n++)
23		pcibios_scan_specific_bus(n);
24}
25
26int __init pci_legacy_init(void)
27{
28	if (!raw_pci_ops)
29		return 1;
 
 
 
 
 
 
 
30
31	pr_info("PCI: Probing PCI hardware\n");
32	pcibios_scan_root(0);
33	return 0;
34}
35
36void pcibios_scan_specific_bus(int busn)
37{
38	int stride = jailhouse_paravirt() ? 1 : 8;
39	int devfn;
 
40	u32 l;
41
42	if (pci_find_bus(0, busn))
43		return;
44
45	for (devfn = 0; devfn < 256; devfn += stride) {
 
46		if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
47		    l != 0x0000 && l != 0xffff) {
48			DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
49			pr_info("PCI: Discovered peer bus %02x\n", busn);
50			pcibios_scan_root(busn);
51			return;
52		}
53	}
54}
55EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus);
56
57static int __init pci_subsys_init(void)
58{
59	/*
60	 * The init function returns an non zero value when
61	 * pci_legacy_init should be invoked.
62	 */
63	if (x86_init.pci.init()) {
64		if (pci_legacy_init()) {
65			pr_info("PCI: System does not support PCI\n");
66			return -ENODEV;
67		}
68	}
69
70	pcibios_fixup_peer_bridges();
71	x86_init.pci.init_irq();
72	pcibios_init();
73
74	return 0;
75}
76subsys_initcall(pci_subsys_init);