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)

4 files changed, 174 insertions, 0 deletions

diff --git a/src/superio/ite/it8728f/Makefile.inc b/src/superio/ite/it8728f/Makefile.inc
new file mode 100644
index 0000000000..d8d4f6a6e1
--- /dev/null
+++ b/src/superio/ite/it8728f/Makefile.inc
@@ -0,0 +1,21 @@
+##
+## 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
+##
+
+romstage-$(CONFIG_SUPERIO_ITE_IT8728F) += early_serial.c
diff --git a/src/superio/ite/it8728f/early_serial.c b/src/superio/ite/it8728f/early_serial.c
new file mode 100644
index 0000000000..7fbd061ab0
--- /dev/null
+++ b/src/superio/ite/it8728f/early_serial.c
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
+ * 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
+ */
+#include "early_serial.h"
+
+/* Superio raw commands */
+static void it8728f_sio_write(device_t dev, u8 index, u8 value)
+{
+	pnp_set_logical_device(dev);
+	pnp_write_config(dev, index, value);
+}
+
+static void it8728f_enter_conf(device_t dev)
+{
+	u16 port = dev >> 8;
+
+	outb(0x87, port);
+	outb(0x01, port);
+	outb(0x55, port);
+	outb((port == 0x4e) ? 0xaa : 0x55, port);
+}
+
+static void it8728f_exit_conf(device_t dev)
+{
+	it8728f_sio_write(dev, IT8728F_CONFIG_REG_CC, 0x02);
+}
+
+/* Superio low level commands */
+void it8728f_reg_write(device_t dev, u8 index, u8 value)
+{
+	it8728f_enter_conf(dev);
+	it8728f_sio_write(dev, index, value);
+	it8728f_exit_conf(dev);
+}
+
+void it8728f_24mhz_clkin(device_t dev)
+{
+	it8728f_reg_write(dev, IT8728F_CONFIG_REG_CLOCKSEL, 0x1);
+}
+
+void it8728f_enable_serial(device_t dev, u16 iobase)
+{
+	/* (1) Enter the configuration state (MB PnP mode). */
+	it8728f_enter_conf(dev);
+
+	/* (2) Modify the data of configuration registers. */
+	pnp_set_logical_device(dev);
+	pnp_set_enable(dev, 0);
+	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
+	pnp_set_enable(dev, 1);
+
+	/* (3) Exit the configuration state (MB PnP mode). */
+	it8728f_exit_conf(dev);
+}
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
diff --git a/src/superio/ite/it8728f/it8728f.h b/src/superio/ite/it8728f/it8728f.h
new file mode 100644
index 0000000000..603e4679bd
--- /dev/null
+++ b/src/superio/ite/it8728f/it8728f.h
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
+ * 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_IT8728F_H
+#define SUPERIO_ITE_IT8728F_IT8728F_H
+
+#define IT8728F_FDC  0x00 /* Floppy */
+#define IT8728F_SP1  0x01 /* Com1 */
+#define IT8728F_SP2  0x02 /* Com2 */
+#define IT8728F_PP   0x03 /* Parallel port */
+#define IT8728F_EC   0x04 /* Environment controller */
+#define IT8728F_KBCK 0x05 /* PS/2 keyboard */
+#define IT8728F_KBCM 0x06 /* PS/2 mouse */
+#define IT8728F_GPIO 0x07 /* GPIO */
+#define IT8728F_IR   0x0a /* Consumer IR */
+
+/* Global configuration registers. */
+#define IT8728F_CONFIG_REG_CC        0x02 /* Configure Control (write-only). */
+#define IT8728F_CONFIG_REG_LDN       0x07 /* Logical Device Number. */
+#define IT8728F_CONFIG_REG_CHIPVERS  0x22 /* Chip version */
+#define IT8728F_CONFIG_REG_CLOCKSEL  0x23 /* Clock Selection. */
+#define IT8728F_CONFIG_REG_SWSUSP    0x24 /* Software Suspend, Flash I/F. 'Special register' */
+
+#endif