1 files changed, 22 insertions, 0 deletions
diff --git a/src/southbridge/amd/cs5535/early_smbus.c b/src/southbridge/amd/cs5535/early_smbus.c
new file mode 100644
index 0000000000..25b6951daa
--- /dev/null
+++ b/src/southbridge/amd/cs5535/early_smbus.c
@@ -0,0 +1,22 @@
+#include "smbus.h"
+
+#define SMBUS_IO_BASE 0x6000
+
+/* initialization for SMBus Controller */
+static void cs5535_enable_smbus(void)
+{
+	unsigned char val;
+
+	/* reset SMBUS controller */
+	outb(0, SMBUS_IO_BASE + SMB_CTRL2);
+
+	/* Set SCL freq and enable SMB controller */
+	val = inb(SMBUS_IO_BASE + SMB_CTRL2);
+	val |= ((0x20 << 1) | SMB_CTRL2_ENABLE);
+	outb(val, SMBUS_IO_BASE + SMB_CTRL2);
+
+	/* Setup SMBus host controller address to 0xEF */
+	val = inb(SMBUS_IO_BASE + SMB_ADD);
+	val |= (0xEF | SMB_ADD_SAEN);
+	outb(val, SMBUS_IO_BASE + SMB_ADD);
+}