1 files changed, 45 insertions, 0 deletions
diff --git a/src/southbridge/intel/i440bx/i440bx_early_smbus.c b/src/southbridge/intel/i440bx/i440bx_early_smbus.c
new file mode 100644
index 0000000000..a3db7b88c0
--- /dev/null
+++ b/src/southbridge/intel/i440bx/i440bx_early_smbus.c
@@ -0,0 +1,45 @@
+#include "i440bx_smbus.h"
+
+#define SMBUS_IO_BASE 0x0f00
+
+static void enable_smbus(void)
+{
+	device_t dev;
+	dev = pci_locate_device(PCI_ID(0x8086, 0x7113), 0);
+	if (dev == PCI_DEV_INVALID) {
+		die("SMBUS controller not found\r\n");
+	}
+	uint8_t enable;
+	print_spew("SMBus controller enabled\r\n");
+	pci_write_config32(dev, 0x90, SMBUS_IO_BASE );
+	// Enable and set SMBBus 
+	// 0x01 Interrupt to SMI# 
+	// (0x4<<1)|1 set interrupt to IRQ9
+	pci_write_config8(dev, 0xd2, (0x4<<1)|1);
+	
+	// Enable the IO space
+	pci_write_config16(dev, 0x04, 1);
+	
+	/* clear any lingering errors, so the transaction will run */
+	outb(0x1e, SMBUS_IO_BASE + SMBGSTATUS);
+}
+
+static int smbus_recv_byte(unsigned device)
+{
+	return do_smbus_recv_byte(SMBUS_IO_BASE, device);
+}
+
+static int smbus_send_byte(unsigned device, unsigned char val)
+{
+	return do_smbus_send_byte(SMBUS_IO_BASE, device, val);
+}
+
+static int smbus_read_byte(unsigned device, unsigned address)
+{
+	return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
+}
+
+static int smbus_write_byte(unsigned device, unsigned address, unsigned char val)
+{
+	return do_smbus_write_byte(SMBUS_IO_BASE, device, address, val);
+}