1 #include <linux/kernel.h>
3 #include <asm/pci-direct.h>
7 /* Direct PCI access. This is used for PCI accesses in early boot before
8 the PCI subsystem works. */
10 #define PDprintk(x...)
12 u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
15 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
18 PDprintk("%x reading 4 from %x: %x\n", slot, offset, v);
22 u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
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);
31 u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
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);
40 void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
43 PDprintk("%x writing to %x: %x\n", slot, offset, val);
44 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
48 void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
50 PDprintk("%x writing to %x: %x\n", slot, offset, val);
51 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
55 int early_pci_allowed(void)
57 return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==