1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/kernel.h>
 3#include <linux/pci.h>
 4#include <asm/pci-direct.h>
 5#include <asm/io.h>
 6#include <asm/pci_x86.h>
 7
 8/* Direct PCI access. This is used for PCI accesses in early boot before
 9   the PCI subsystem works. */
10
11u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
12{
13	u32 v;
14	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
15	v = inl(0xcfc);
16	return v;
17}
18
19u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
20{
21	u8 v;
22	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
23	v = inb(0xcfc + (offset&3));
24	return v;
25}
26
27u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
28{
29	u16 v;
30	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
31	v = inw(0xcfc + (offset&2));
32	return v;
33}
34
35void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
36				    u32 val)
37{
38	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
39	outl(val, 0xcfc);
40}
41
42void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
43{
44	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
45	outb(val, 0xcfc + (offset&3));
46}
47
48void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
49{
50	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
51	outw(val, 0xcfc + (offset&2));
52}
53
54int early_pci_allowed(void)
55{
56	return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
57			PCI_PROBE_CONF1;
58}
59

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/kernel.h>
 3#include <linux/pci.h>
 4#include <asm/pci-direct.h>
 5#include <asm/io.h>
 6#include <asm/pci_x86.h>
 7
 8/* Direct PCI access. This is used for PCI accesses in early boot before
 9   the PCI subsystem works. */
10
11u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
12{
13	u32 v;
14	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
15	v = inl(0xcfc);
16	return v;
17}
18
19u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
20{
21	u8 v;
22	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
23	v = inb(0xcfc + (offset&3));
24	return v;
25}
26
27u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
28{
29	u16 v;
30	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
31	v = inw(0xcfc + (offset&2));
32	return v;
33}
34
35void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
36				    u32 val)
37{
38	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
39	outl(val, 0xcfc);
40}
41
42void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
43{
44	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
45	outb(val, 0xcfc + (offset&3));
46}
47
48void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
49{
50	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
51	outw(val, 0xcfc + (offset&2));
52}
53
54int early_pci_allowed(void)
55{
56	return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
57			PCI_PROBE_CONF1;
58}
59