1 #include <linux/kernel.h> 2 #include <linux/pci.h> 3 #include <asm/pci-direct.h> 4 #include <asm/io.h> 5 #include "pci.h" 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 } 47 48 void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val) 49 { 50 PDprintk("%x writing to %x: %x\n", slot, offset, val); 51 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); 52 outb(val, 0xcfc); 53 } 54 55 int early_pci_allowed(void) 56 { 57 return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) == 58 PCI_PROBE_CONF1; 59 } 60