it8728f: Add ITE IT8728F superio early serial support.

This is the first of a series of patches to provide support
for a new mainboard, Gigabyte GA-B75M-D3V.

This patch provides early serial for the superio and has been
tested on this mainboard.  The code is based on IT8718F superio.

Change-Id: I5636199b49314166ed3b81e60b41131964dd44ff
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: http://review.coreboot.org/3794
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)

1 files changed, 40 insertions, 0 deletions

diff --git a/src/superio/ite/it8728f/early_serial.h b/src/superio/ite/it8728f/early_serial.h
new file mode 100644
index 0000000000..a146f4c7a6
--- /dev/null
+++ b/src/superio/ite/it8728f/early_serial.h
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Damien Zammit <damien@zamaudio.com>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef SUPERIO_ITE_IT8728F_EARLY_SERIAL_H
+#define SUPERIO_ITE_IT8728F_EARLY_SERIAL_H
+
+#include <stdint.h>
+#include <arch/io.h>
+#include <device/pnp_def.h>
+#include "it8728f.h"
+
+/*
+ * Superio low level commands
+ * Pass dev = PNP_DEV(superiobase, LDN)
+ */
+void it8728f_reg_write(device_t dev, u8 index, u8 value);
+
+/* Select 24MHz CLKIN (48MHz default). */
+void it8728f_24mhz_clkin(device_t dev);
+
+/* Enable the serial port(s). */
+void it8728f_enable_serial(device_t dev, u16 iobase);
+
+#endif