Commit | Line | Data |
---|---|---|
8f60774a | 1 | #include <linux/kernel.h> |
0637a70a | 2 | #include <linux/pci.h> |
8f60774a AK |
3 | #include <asm/pci-direct.h> |
4 | #include <asm/io.h> | |
82487711 | 5 | #include <asm/pci_x86.h> |
8f60774a AK |
6 | |
7 | /* Direct PCI access. This is used for PCI accesses in early boot before | |
8 | the PCI subsystem works. */ | |
9 | ||
8f60774a AK |
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 | if (v != 0xffffffff) | |
cfc1b9a6 | 16 | pr_debug("%x reading 4 from %x: %x\n", slot, offset, v); |
8f60774a AK |
17 | return v; |
18 | } | |
19 | ||
20 | u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset) | |
21 | { | |
22 | u8 v; | |
23 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); | |
24 | v = inb(0xcfc + (offset&3)); | |
cfc1b9a6 | 25 | pr_debug("%x reading 1 from %x: %x\n", slot, offset, v); |
8f60774a AK |
26 | return v; |
27 | } | |
28 | ||
29 | u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset) | |
30 | { | |
31 | u16 v; | |
32 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); | |
33 | v = inw(0xcfc + (offset&2)); | |
cfc1b9a6 | 34 | pr_debug("%x reading 2 from %x: %x\n", slot, offset, v); |
8f60774a AK |
35 | return v; |
36 | } | |
37 | ||
38 | void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, | |
39 | u32 val) | |
40 | { | |
cfc1b9a6 | 41 | pr_debug("%x writing to %x: %x\n", slot, offset, val); |
8f60774a AK |
42 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
43 | outl(val, 0xcfc); | |
44 | } | |
0637a70a | 45 | |
274e1bbd SS |
46 | void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val) |
47 | { | |
cfc1b9a6 | 48 | pr_debug("%x writing to %x: %x\n", slot, offset, val); |
274e1bbd | 49 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
e7891c73 YL |
50 | outb(val, 0xcfc + (offset&3)); |
51 | } | |
52 | ||
53 | void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val) | |
54 | { | |
cfc1b9a6 | 55 | pr_debug("%x writing to %x: %x\n", slot, offset, val); |
e7891c73 YL |
56 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); |
57 | outw(val, 0xcfc + (offset&2)); | |
274e1bbd SS |
58 | } |
59 | ||
0637a70a AK |
60 | int early_pci_allowed(void) |
61 | { | |
62 | return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) == | |
63 | PCI_PROBE_CONF1; | |
64 | } | |
e3f2baeb YL |
65 | |
66 | void early_dump_pci_device(u8 bus, u8 slot, u8 func) | |
67 | { | |
68 | int i; | |
69 | int j; | |
70 | u32 val; | |
71 | ||
7bc9e77d BH |
72 | printk(KERN_INFO "pci 0000:%02x:%02x.%d config space:", |
73 | bus, slot, func); | |
e3f2baeb YL |
74 | |
75 | for (i = 0; i < 256; i += 4) { | |
76 | if (!(i & 0x0f)) | |
7bc9e77d | 77 | printk("\n %02x:",i); |
e3f2baeb YL |
78 | |
79 | val = read_pci_config(bus, slot, func, i); | |
80 | for (j = 0; j < 4; j++) { | |
81 | printk(" %02x", val & 0xff); | |
82 | val >>= 8; | |
83 | } | |
84 | } | |
85 | printk("\n"); | |
86 | } | |
87 | ||
88 | void early_dump_pci_devices(void) | |
89 | { | |
90 | unsigned bus, slot, func; | |
91 | ||
92 | if (!early_pci_allowed()) | |
93 | return; | |
94 | ||
95 | for (bus = 0; bus < 256; bus++) { | |
96 | for (slot = 0; slot < 32; slot++) { | |
97 | for (func = 0; func < 8; func++) { | |
98 | u32 class; | |
99 | u8 type; | |
600914ba | 100 | |
e3f2baeb YL |
101 | class = read_pci_config(bus, slot, func, |
102 | PCI_CLASS_REVISION); | |
103 | if (class == 0xffffffff) | |
600914ba | 104 | continue; |
e3f2baeb YL |
105 | |
106 | early_dump_pci_device(bus, slot, func); | |
107 | ||
600914ba BH |
108 | if (func == 0) { |
109 | type = read_pci_config_byte(bus, slot, | |
110 | func, | |
e3f2baeb | 111 | PCI_HEADER_TYPE); |
600914ba BH |
112 | if (!(type & 0x80)) |
113 | break; | |
114 | } | |
e3f2baeb YL |
115 | } |
116 | } | |
117 | } | |
118 | } |