1#include <linux/kernel.h>
2#include <linux/pci.h>
3#include <asm/pci-direct.h>
4#include <asm/io.h>
5#include "pci.h"
6
7/* Direct PCI access. This is used for PCI accesses in early boot before
8   the PCI subsystem works. */
9
10#define PDprintk(x...)
11
12u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
13{
14	u32 v;
15	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
16	v = inl(0xcfc);
17	if (v != 0xffffffff)
18		PDprintk("%x reading 4 from %x: %x\n", slot, offset, v);
19	return v;
20}
21
22u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
23{
24	u8 v;
25	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
26	v = inb(0xcfc + (offset&3));
27	PDprintk("%x reading 1 from %x: %x\n", slot, offset, v);
28	return v;
29}
30
31u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
32{
33	u16 v;
34	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
35	v = inw(0xcfc + (offset&2));
36	PDprintk("%x reading 2 from %x: %x\n", slot, offset, v);
37	return v;
38}
39
40void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
41				    u32 val)
42{
43	PDprintk("%x writing to %x: %x\n", slot, offset, val);
44	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
45	outl(val, 0xcfc);
46}
47
48void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
49{
50	PDprintk("%x writing to %x: %x\n", slot, offset, val);
51	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
52	outb(val, 0xcfc);
53}
54
55int early_pci_allowed(void)
56{
57	return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
58			PCI_PROBE_CONF1;
59}
60