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
read_pci_config(u8 bus,u8 slot,u8 func,u8 offset)10 u32 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
read_pci_config_byte(u8 bus,u8 slot,u8 func,u8 offset)18 u8 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
read_pci_config_16(u8 bus,u8 slot,u8 func,u8 offset)26 u16 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
write_pci_config(u8 bus,u8 slot,u8 func,u8 offset,u32 val)34 void 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
write_pci_config_byte(u8 bus,u8 slot,u8 func,u8 offset,u8 val)41 void 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
write_pci_config_16(u8 bus,u8 slot,u8 func,u8 offset,u16 val)47 void 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
early_pci_allowed(void)53 int early_pci_allowed(void)
54 {
55 return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
56 PCI_PROBE_CONF1;
57 }
58
early_dump_pci_device(u8 bus,u8 slot,u8 func)59 void 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
early_dump_pci_devices(void)81 void 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 }
112