#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); 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)); 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)); return v; } void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, u32 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) { 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) { 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 0000:%02x:%02x.%d config space:", bus, slot, func); for (i = 0; i < 256; i += 4) { if (!(i & 0x0f)) printk("\n %02x:",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) continue; early_dump_pci_device(bus, slot, func); if (func == 0) { type = read_pci_config_byte(bus, slot, func, PCI_HEADER_TYPE); if (!(type & 0x80)) break; } } } } }