1 files changed, 48 insertions, 0 deletions

diff --git a/include/asm-x86_64/pci-direct.h b/include/asm-x86_64/pci-direct.h
new file mode 100644
index 000000000000..036b6ca5b53b
--- /dev/null
+++ b/include/asm-x86_64/pci-direct.h
@@ -0,0 +1,48 @@
+#ifndef ASM_PCI_DIRECT_H
+#define ASM_PCI_DIRECT_H 1
+
+#include <linux/types.h>
+#include <asm/io.h>
+
+/* Direct PCI access. This is used for PCI accesses in early boot before
+   the PCI subsystem works. */ 
+
+#define PDprintk(x...)
+
+static inline 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)
+                PDprintk("%x reading 4 from %x: %x\n", slot, offset, v);
+        return v;
+}
+
+static inline 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)); 
+        PDprintk("%x reading 1 from %x: %x\n", slot, offset, v);
+        return v;
+}
+
+static inline 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)); 
+        PDprintk("%x reading 2 from %x: %x\n", slot, offset, v);
+        return v;
+}
+
+static inline void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
+                                    u32 val)
+{
+        PDprintk("%x writing to %x: %x\n", slot, offset, val); 
+        outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
+        outl(val, 0xcfc); 
+}
+
+#endif