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> | |
0637a70a | 5 | #include "pci.h" |
8f60774a AK |
6 | |
7 | /* Direct PCI access. This is used for PCI accesses in early boot before | |
8 | the PCI subsystem works. */ | |
9 | ||
10 | #define PDprintk(x...) | |
11 | ||
12 | u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset) | |
13 | { | |
14 | u32 v; | |
15 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); | |
16 | v = inl(0xcfc); | |
17 | if (v != 0xffffffff) | |
18 | PDprintk("%x reading 4 from %x: %x\n", slot, offset, v); | |
19 | return v; | |
20 | } | |
21 | ||
22 | u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset) | |
23 | { | |
24 | u8 v; | |
25 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); | |
26 | v = inb(0xcfc + (offset&3)); | |
27 | PDprintk("%x reading 1 from %x: %x\n", slot, offset, v); | |
28 | return v; | |
29 | } | |
30 | ||
31 | u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset) | |
32 | { | |
33 | u16 v; | |
34 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); | |
35 | v = inw(0xcfc + (offset&2)); | |
36 | PDprintk("%x reading 2 from %x: %x\n", slot, offset, v); | |
37 | return v; | |
38 | } | |
39 | ||
40 | void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, | |
41 | u32 val) | |
42 | { | |
43 | PDprintk("%x writing to %x: %x\n", slot, offset, val); | |
44 | outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); | |
45 | outl(val, 0xcfc); | |
46 | } | |
0637a70a AK |
47 | |
48 | int early_pci_allowed(void) | |
49 | { | |
50 | return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) == | |
51 | PCI_PROBE_CONF1; | |
52 | } |