1 files changed, 69 insertions, 0 deletions
diff --git a/src/superio/intel/i8900/early_serial.c b/src/superio/intel/i8900/early_serial.c
new file mode 100644
index 0000000000..fb211e96e6
--- /dev/null
+++ b/src/superio/intel/i8900/early_serial.c
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008 Arastra, Inc.
+ *
+ * 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.
+ */
+
+#include <arch/io.h>
+#include <device/pnp.h>
+#include "i8900.h"
+
+static void pnp_enter_ext_func_mode(pnp_devfn_t dev)
+{
+	u16 port = dev >> 8;
+
+	outb(0x80, port);
+	outb(0x86, port);
+}
+
+static void pnp_exit_ext_func_mode(pnp_devfn_t dev)
+{
+	u16 port = dev >> 8;
+
+	outb(0x68, port);
+	outb(0x08, port);
+}
+
+/* Enable device interrupts, set UART_CLK predivide. */
+void i8900_configure_uart_clk(pnp_devfn_t dev, u8 predivide)
+{
+	pnp_enter_ext_func_mode(dev);
+	pnp_write_config(dev, I8900_SIW_CONFIGURATION,
+	                 (predivide << 2) | I8900_ENABLE_SIRQ);
+	pnp_exit_ext_func_mode(dev);
+}
+
+void i8900_enable_serial(pnp_devfn_t dev, u16 iobase)
+{
+	pnp_enter_ext_func_mode(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_ext_func_mode(dev);
+}
+
+void i8900_enable_wdt(pnp_devfn_t dev, u16 iobase)
+{
+	/* Enable WDT */
+	pnp_enter_ext_func_mode(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_ext_func_mode(dev);
+}