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);
52 outb(val, 0xcfc + (offset&3));
55 void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
57 PDprintk("%x writing to %x: %x\n", slot, offset, val);
58 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
59 outw(val, 0xcfc + (offset&2));
62 int early_pci_allowed(void)
64 return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
68 void early_dump_pci_device(u8 bus, u8 slot, u8 func)
74 printk("PCI: %02x:%02x:%02x", bus, slot, func);
76 for (i = 0; i < 256; i += 4) {
80 val = read_pci_config(bus, slot, func, i);
81 for (j = 0; j < 4; j++) {
82 printk(" %02x", val & 0xff);
89 void early_dump_pci_devices(void)
91 unsigned bus, slot, func;
93 if (!early_pci_allowed())
96 for (bus = 0; bus < 256; bus++) {
97 for (slot = 0; slot < 32; slot++) {
98 for (func = 0; func < 8; func++) {
101 class = read_pci_config(bus, slot, func,
103 if (class == 0xffffffff)
106 early_dump_pci_device(bus, slot, func);
108 /* No multi-function device? */
109 type = read_pci_config_byte(bus, slot, func,