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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8f60774a | 2 | #include <linux/kernel.h> |
0637a70a | 3 | #include <linux/pci.h> |
8f60774a AK |
4 | #include <asm/pci-direct.h> |
5 | #include <asm/io.h> | |
82487711 | 6 | #include <asm/pci_x86.h> |
8f60774a AK |
7 | |
8 | /* Direct PCI access. This is used for PCI accesses in early boot before | |
9 | the PCI subsystem works. */ | |
10 | ||
8f60774a AK |
11 | u32 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); | |
8f60774a AK |
16 | return v; |
17 | } | |
18 | ||
19 | u8 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)); | |
8f60774a AK |
24 | return v; |
25 | } | |
26 | ||
27 | u16 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)); | |
8f60774a AK |
32 | return v; |
33 | } | |
34 | ||
35 | void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, | |
36 | u32 val) | |
37 | { | |
8f60774a AK |
38 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
39 | outl(val, 0xcfc); | |
40 | } | |
0637a70a | 41 | |
274e1bbd SS |
42 | void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val) |
43 | { | |
274e1bbd | 44 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
e7891c73 YL |
45 | outb(val, 0xcfc + (offset&3)); |
46 | } | |
47 | ||
48 | void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val) | |
49 | { | |
e7891c73 YL |
50 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
51 | outw(val, 0xcfc + (offset&2)); | |
274e1bbd SS |
52 | } |
53 | ||
0637a70a AK |
54 | int early_pci_allowed(void) |
55 | { | |
56 | return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) == | |
57 | PCI_PROBE_CONF1; | |
58 | } | |
e3f2baeb YL |
59 | |
60 | void early_dump_pci_device(u8 bus, u8 slot, u8 func) | |
61 | { | |
62 | int i; | |
63 | int j; | |
64 | u32 val; | |
65 | ||
7bc9e77d BH |
66 | printk(KERN_INFO "pci 0000:%02x:%02x.%d config space:", |
67 | bus, slot, func); | |
e3f2baeb YL |
68 | |
69 | for (i = 0; i < 256; i += 4) { | |
70 | if (!(i & 0x0f)) | |
7bc9e77d | 71 | printk("\n %02x:",i); |
e3f2baeb YL |
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 | ||
82 | void 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; | |
600914ba | 94 | |
e3f2baeb YL |
95 | class = read_pci_config(bus, slot, func, |
96 | PCI_CLASS_REVISION); | |
97 | if (class == 0xffffffff) | |
600914ba | 98 | continue; |
e3f2baeb YL |
99 | |
100 | early_dump_pci_device(bus, slot, func); | |
101 | ||
600914ba BH |
102 | if (func == 0) { |
103 | type = read_pci_config_byte(bus, slot, | |
104 | func, | |
e3f2baeb | 105 | PCI_HEADER_TYPE); |
600914ba BH |
106 | if (!(type & 0x80)) |
107 | break; | |
108 | } | |
e3f2baeb YL |
109 | } |
110 | } | |
111 | } | |
112 | } |