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
 60void early_dump_pci_device(u8 bus, u8 slot, u8 func)
 61{
 62	int i;
 63	int j;
 64	u32 val;
 65
 66	printk(KERN_INFO "pci 0000:%02x:%02x.%d config space:",
 67	       bus, slot, func);
 68
 69	for (i = 0; i < 256; i += 4) {
 70		if (!(i & 0x0f))
 71			printk("\n  %02x:",i);
 72
 73		val = read_pci_config(bus, slot, func, i);
 74		for (j = 0; j < 4; j++) {
 75			printk(" %02x", val & 0xff);
 76			val >>= 8;
 77		}
 78	}
 79	printk("\n");
 80}
 81
 82void early_dump_pci_devices(void)
 83{
 84	unsigned bus, slot, func;
 85
 86	if (!early_pci_allowed())
 87		return;
 88
 89	for (bus = 0; bus < 256; bus++) {
 90		for (slot = 0; slot < 32; slot++) {
 91			for (func = 0; func < 8; func++) {
 92				u32 class;
 93				u8 type;
 94
 95				class = read_pci_config(bus, slot, func,
 96							PCI_CLASS_REVISION);
 97				if (class == 0xffffffff)
 98					continue;
 99
100				early_dump_pci_device(bus, slot, func);
101
102				if (func == 0) {
103					type = read_pci_config_byte(bus, slot,
104								    func,
105							       PCI_HEADER_TYPE);
106					if (!(type & 0x80))
107						break;
108				}
109			}
110		}
111	}
112}