1#include <linux/kernel.h>
2#include <linux/pci.h>
3#include <linux/interrupt.h>
4#include <linux/mm.h>
5#include <linux/init.h>
6#include <linux/ioport.h>
7
8#include <asm/io.h>
9#include <asm/system.h>
10
11#include <asm/mach/pci.h>
12
13#define MAX_SLOTS		7
14
15#define CONFIG_CMD(bus, devfn, where)   (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
16
17static int
18via82c505_read_config(struct pci_bus *bus, unsigned int devfn, int where,
19		      int size, u32 *value)
20{
21	outl(CONFIG_CMD(bus,devfn,where),0xCF8);
22	switch (size) {
23	case 1:
24		*value=inb(0xCFC + (where&3));
25		break;
26	case 2:
27		*value=inw(0xCFC + (where&2));
28		break;
29	case 4:
30		*value=inl(0xCFC);
31		break;
32	}
33	return PCIBIOS_SUCCESSFUL;
34}
35
36static int
37via82c505_write_config(struct pci_bus *bus, unsigned int devfn, int where,
38		       int size, u32 value)
39{
40	outl(CONFIG_CMD(bus,devfn,where),0xCF8);
41	switch (size) {
42	case 1:
43		outb(value, 0xCFC + (where&3));
44		break;
45	case 2:
46		outw(value, 0xCFC + (where&2));
47		break;
48	case 4:
49		outl(value, 0xCFC);
50		break;
51	}
52	return PCIBIOS_SUCCESSFUL;
53}
54
55static struct pci_ops via82c505_ops = {
56	.read	= via82c505_read_config,
57	.write	= via82c505_write_config,
58};
59
60void __init via82c505_preinit(void)
61{
62	printk(KERN_DEBUG "PCI: VIA 82c505\n");
63	if (!request_region(0xA8,2,"via config")) {
64		printk(KERN_WARNING"VIA 82c505: Unable to request region 0xA8\n");
65		return;
66	}
67	if (!request_region(0xCF8,8,"pci config")) {
68		printk(KERN_WARNING"VIA 82c505: Unable to request region 0xCF8\n");
69		release_region(0xA8, 2);
70		return;
71	}
72
73	/* Enable compatible Mode */
74	outb(0x96,0xA8);
75	outb(0x18,0xA9);
76	outb(0x93,0xA8);
77	outb(0xd0,0xA9);
78
79}
80
81int __init via82c505_setup(int nr, struct pci_sys_data *sys)
82{
83	return (nr == 0);
84}
85
86struct pci_bus * __init via82c505_scan_bus(int nr, struct pci_sys_data *sysdata)
87{
88	if (nr == 0)
89		return pci_scan_bus(0, &via82c505_ops, sysdata);
90
91	return NULL;
92}
93