116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <asm/pci-direct.h>
|
|
#include <asm/io.h>
|
|
#include <asm/pci_x86.h>
|
|
|
|
/* Direct PCI access. This is used for PCI accesses in early boot before
|
|
the PCI subsystem works. */
|
|
|
|
u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
|
|
{
|
|
u32 v;
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
v = inl(0xcfc);
|
|
if (v != 0xffffffff)
|
|
pr_debug("%x reading 4 from %x: %x\n", slot, offset, v);
|
|
return v;
|
|
}
|
|
|
|
u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
|
|
{
|
|
u8 v;
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
v = inb(0xcfc + (offset&3));
|
|
pr_debug("%x reading 1 from %x: %x\n", slot, offset, v);
|
|
return v;
|
|
}
|
|
|
|
u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
|
|
{
|
|
u16 v;
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
v = inw(0xcfc + (offset&2));
|
|
pr_debug("%x reading 2 from %x: %x\n", slot, offset, v);
|
|
return v;
|
|
}
|
|
|
|
void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
|
|
u32 val)
|
|
{
|
|
pr_debug("%x writing to %x: %x\n", slot, offset, val);
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
outl(val, 0xcfc);
|
|
}
|
|
|
|
void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
|
|
{
|
|
pr_debug("%x writing to %x: %x\n", slot, offset, val);
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
outb(val, 0xcfc + (offset&3));
|
|
}
|
|
|
|
void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
|
|
{
|
|
pr_debug("%x writing to %x: %x\n", slot, offset, val);
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
outw(val, 0xcfc + (offset&2));
|
|
}
|
|
|
|
int early_pci_allowed(void)
|
|
{
|
|
return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
|
|
PCI_PROBE_CONF1;
|
|
}
|
|
|
|
void early_dump_pci_device(u8 bus, u8 slot, u8 func)
|
|
{
|
|
int i;
|
|
int j;
|
|
u32 val;
|
|
|
|
printk(KERN_INFO "PCI: %02x:%02x:%02x", bus, slot, func);
|
|
|
|
for (i = 0; i < 256; i += 4) {
|
|
if (!(i & 0x0f))
|
|
printk("\n%04x:",i);
|
|
|
|
val = read_pci_config(bus, slot, func, i);
|
|
for (j = 0; j < 4; j++) {
|
|
printk(" %02x", val & 0xff);
|
|
val >>= 8;
|
|
}
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
void early_dump_pci_devices(void)
|
|
{
|
|
unsigned bus, slot, func;
|
|
|
|
if (!early_pci_allowed())
|
|
return;
|
|
|
|
for (bus = 0; bus < 256; bus++) {
|
|
for (slot = 0; slot < 32; slot++) {
|
|
for (func = 0; func < 8; func++) {
|
|
u32 class;
|
|
u8 type;
|
|
class = read_pci_config(bus, slot, func,
|
|
PCI_CLASS_REVISION);
|
|
if (class == 0xffffffff)
|
|
break;
|
|
|
|
early_dump_pci_device(bus, slot, func);
|
|
|
|
/* No multi-function device? */
|
|
type = read_pci_config_byte(bus, slot, func,
|
|
PCI_HEADER_TYPE);
|
|
if (!(type & 0x80))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|