superio/nuvoton: Adds a function to route pins 41-48 to UARTD

Pins 41-48 default to being GPIs. This switches the internal
mux to connect them to UARTD.

Change-Id: I61393b8c35cbc664f6520f60eed09ba4bbede0dc
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/5963
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

3 files changed, 62 insertions, 3 deletions

diff --git a/src/superio/nuvoton/nct5104d/Makefile.inc b/src/superio/nuvoton/nct5104d/Makefile.inc
index fcb5ec22c3..b6278bad1d 100644
--- a/src/superio/nuvoton/nct5104d/Makefile.inc
+++ b/src/superio/nuvoton/nct5104d/Makefile.inc
@@ -19,3 +19,4 @@
 ##
 
 ramstage-$(CONFIG_SUPERIO_NUVOTON_NCT5104D) += superio.c
+romstage-$(CONFIG_SUPERIO_NUVOTON_NCT5104D) += early_init.c
diff --git a/src/superio/nuvoton/nct5104d/early_init.c b/src/superio/nuvoton/nct5104d/early_init.c
new file mode 100644
index 0000000000..c9a408ea64
--- /dev/null
+++ b/src/superio/nuvoton/nct5104d/early_init.c
@@ -0,0 +1,56 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Sage Electronic Engineering, LLC
+ *
+ * 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 <arch/io.h>
+#include <device/pnp.h>
+#include <stdint.h>
+#include "nct5104d.h"
+
+#define NUVOTON_ENTRY_KEY 0x87
+#define NUVOTON_EXIT_KEY 0xAA
+
+/* Enable configuration: pass entry key '0x87' into index port dev
+ * two times. */
+static void pnp_enter_conf_state(device_t dev)
+{
+	u16 port = dev >> 8;
+	outb(NUVOTON_ENTRY_KEY, port);
+	outb(NUVOTON_ENTRY_KEY, port);
+}
+
+/* Disable configuration: pass exit key '0xAA' into index port dev. */
+static void pnp_exit_conf_state(device_t dev)
+{
+	u16 port = dev >> 8;
+	outb(NUVOTON_EXIT_KEY, port);
+}
+
+/* Route UARTD to pins 41-48 */
+void nct5104d_enable_uartd(device_t dev)
+{
+	u8 tmp;
+	u16 port = dev >> 8;
+	pnp_enter_conf_state(dev);
+	outb(0x1c, port);
+	tmp = inb(port + 1);
+	tmp |= 0x04;
+	outb(tmp, port + 1);
+	pnp_exit_conf_state(dev);
+}
diff --git a/src/superio/nuvoton/nct5104d/nct5104d.h b/src/superio/nuvoton/nct5104d/nct5104d.h
index b72dda06b3..74df793b6f 100644
--- a/src/superio/nuvoton/nct5104d/nct5104d.h
+++ b/src/superio/nuvoton/nct5104d/nct5104d.h
@@ -19,8 +19,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
-#ifndef SUPERIO_NUVOTON_NCT5104D_NCT5104D_H
-#define SUPERIO_NUVOTON_NCT5104D_NCT5104D_H
+#ifndef SUPERIO_NUVOTON_NCT5104D_H
+#define SUPERIO_NUVOTON_NCT5104D_H
 
 /* Logical Device Numbers (LDN). */
 #define NCT5104D_FDC        0x00 /* FDC - not pinned out */
@@ -42,4 +42,6 @@
 #define NCT5104D_GPIO1 ((1 << 8) | NCT5104D_GPIO_V)
 #define NCT5104D_GPIO6 ((6 << 8) | NCT5104D_GPIO_V)
 
-#endif /* SUPERIO_NUVOTON_NCT5104D_NCT5104D_H */
+void nct5104d_enable_uartd(device_t dev);
+
+#endif /* SUPERIO_NUVOTON_NCT5104D_H */