1 files changed, 68 insertions, 0 deletions
diff --git a/src/superio/smsc/lpc47b272/lpc47b272_early_serial.c b/src/superio/smsc/lpc47b272/lpc47b272_early_serial.c
new file mode 100644
index 0000000000..837359d368
--- /dev/null
+++ b/src/superio/smsc/lpc47b272/lpc47b272_early_serial.c
@@ -0,0 +1,68 @@
+/*
+ * $Header$
+ *
+ * lpc47b272_early_serial.c: Pre-RAM driver for SMSC LPC47B272 Super I/O chip
+ *
+ * Copyright (C) 2005 Digital Design Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * $Log$
+ *
+ */
+
+#include <arch/romcc_io.h>
+#include "lpc47b272.h"
+
+//----------------------------------------------------------------------------------
+// Function:    	pnp_enter_conf_state
+// Parameters:  	dev - high 8 bits = Super I/O port
+// Return Value:	None
+// Description: 	Enable access to the LPC47B272's configuration registers.
+//
+static inline void pnp_enter_conf_state(device_t dev) {
+	unsigned port = dev>>8;
+    outb(0x55, port);
+}
+
+//----------------------------------------------------------------------------------
+// Function:    	pnp_exit_conf_state
+// Parameters:  	dev - high 8 bits = Super I/O port
+// Return Value:	None
+// Description: 	Disable access to the LPC47B272's configuration registers.
+//
+static void pnp_exit_conf_state(device_t dev) {
+	unsigned port = dev>>8;
+    outb(0xaa, port);
+}
+
+//----------------------------------------------------------------------------------
+// Function:    	lpc47b272_enable_serial
+// Parameters:  	dev - high 8 bits = Super I/O port, 
+//						  low 8 bits = logical device number (per lpc47b272.h)
+//					iobase - processor I/O port address to assign to this serial device
+// Return Value:	bool
+// Description: 	Configure the base I/O port of the specified serial device
+//					and enable the serial device.
+//
+static void lpc47b272_enable_serial(device_t dev, unsigned iobase)
+{
+	pnp_enter_conf_state(dev);
+	pnp_set_logical_device(dev);
+	pnp_set_enable(dev, 0);
+	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
+	pnp_set_enable(dev, 1);
+	pnp_exit_conf_state(dev);
+}