1#include <linux/kernel.h> 2#include <linux/pci.h> 3#include <asm/pci-direct.h> 4#include <asm/io.h> 5#include <asm/pci_x86.h> 6 7/* Direct PCI access. This is used for PCI accesses in early boot before 8 the PCI subsystem works. */ 9 10u32 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 return v; 16} 17 18u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset) 19{ 20 u8 v; 21 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); 22 v = inb(0xcfc + (offset&3)); 23 return v; 24} 25 26u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset) 27{ 28 u16 v; 29 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); 30 v = inw(0xcfc + (offset&2)); 31 return v; 32} 33 34void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, 35 u32 val) 36{ 37 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); 38 outl(val, 0xcfc); 39} 40 41void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val) 42{ 43 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); 44 outb(val, 0xcfc + (offset&3)); 45} 46 47void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val) 48{ 49 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8); 50 outw(val, 0xcfc + (offset&2)); 51} 52 53int early_pci_allowed(void) 54{ 55 return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) == 56 PCI_PROBE_CONF1; 57} 58 59void early_dump_pci_device(u8 bus, u8 slot, u8 func) 60{ 61 int i; 62 int j; 63 u32 val; 64 65 printk(KERN_INFO "pci 0000:%02x:%02x.%d config space:", 66 bus, slot, func); 67 68 for (i = 0; i < 256; i += 4) { 69 if (!(i & 0x0f)) 70 printk("\n %02x:",i); 71 72 val = read_pci_config(bus, slot, func, i); 73 for (j = 0; j < 4; j++) { 74 printk(" %02x", val & 0xff); 75 val >>= 8; 76 } 77 } 78 printk("\n"); 79} 80 81void early_dump_pci_devices(void) 82{ 83 unsigned bus, slot, func; 84 85 if (!early_pci_allowed()) 86 return; 87 88 for (bus = 0; bus < 256; bus++) { 89 for (slot = 0; slot < 32; slot++) { 90 for (func = 0; func < 8; func++) { 91 u32 class; 92 u8 type; 93 94 class = read_pci_config(bus, slot, func, 95 PCI_CLASS_REVISION); 96 if (class == 0xffffffff) 97 continue; 98 99 early_dump_pci_device(bus, slot, func); 100 101 if (func == 0) { 102 type = read_pci_config_byte(bus, slot, 103 func, 104 PCI_HEADER_TYPE); 105 if (!(type & 0x80)) 106 break; 107 } 108 } 109 } 110 } 111} 112