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#include <linux/kernel.h>
  2#include <linux/pci.h>
  3#include <asm/pci-direct.h>
  4#include <asm/io.h>
  5#include <asm/pci_x86.h>
  6
  7/* Direct PCI access. This is used for PCI accesses in early boot before
  8   the PCI subsystem works. */
  9
 10u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
 11{
 12	u32 v;
 13	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 14	v = inl(0xcfc);
 15	return v;
 16}
 17
 18u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
 19{
 20	u8 v;
 21	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 22	v = inb(0xcfc + (offset&3));
 23	return v;
 24}
 25
 26u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
 27{
 28	u16 v;
 29	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 30	v = inw(0xcfc + (offset&2));
 31	return v;
 32}
 33
 34void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
 35				    u32 val)
 36{
 37	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 38	outl(val, 0xcfc);
 39}
 40
 41void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
 42{
 43	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 44	outb(val, 0xcfc + (offset&3));
 45}
 46
 47void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
 48{
 49	outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 50	outw(val, 0xcfc + (offset&2));
 51}
 52
 53int early_pci_allowed(void)
 54{
 55	return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
 56			PCI_PROBE_CONF1;
 57}
 58
 59void early_dump_pci_device(u8 bus, u8 slot, u8 func)
 60{
 61	int i;
 62	int j;
 63	u32 val;
 64
 65	printk(KERN_INFO "pci 0000:%02x:%02x.%d config space:",
 66	       bus, slot, func);
 67
 68	for (i = 0; i < 256; i += 4) {
 69		if (!(i & 0x0f))
 70			printk("\n  %02x:",i);
 71
 72		val = read_pci_config(bus, slot, func, i);
 73		for (j = 0; j < 4; j++) {
 74			printk(" %02x", val & 0xff);
 75			val >>= 8;
 76		}
 77	}
 78	printk("\n");
 79}
 80
 81void early_dump_pci_devices(void)
 82{
 83	unsigned bus, slot, func;
 84
 85	if (!early_pci_allowed())
 86		return;
 87
 88	for (bus = 0; bus < 256; bus++) {
 89		for (slot = 0; slot < 32; slot++) {
 90			for (func = 0; func < 8; func++) {
 91				u32 class;
 92				u8 type;
 93
 94				class = read_pci_config(bus, slot, func,
 95							PCI_CLASS_REVISION);
 96				if (class == 0xffffffff)
 97					continue;
 98
 99				early_dump_pci_device(bus, slot, func);
100
101				if (func == 0) {
102					type = read_pci_config_byte(bus, slot,
103								    func,
104							       PCI_HEADER_TYPE);
105					if (!(type & 0x80))
106						break;
107				}
108			}
109		}
110	}
111}