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-rw-r--r--src/superio/winbond/w83977tf/w83977tf_early_serial.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/src/superio/winbond/w83977tf/w83977tf_early_serial.c b/src/superio/winbond/w83977tf/w83977tf_early_serial.c
index fffc16d430..a956e11fc5 100644
--- a/src/superio/winbond/w83977tf/w83977tf_early_serial.c
+++ b/src/superio/winbond/w83977tf/w83977tf_early_serial.c
@@ -1,11 +1,25 @@
#include <arch/romcc_io.h>
#include "w83977tf.h"
+static inline void pnp_enter_ext_func_mode(device_t dev)
+{
+ unsigned int port = dev >> 8;
+ outb(0x87, port);
+ outb(0x87, port);
+}
+
+static void pnp_exit_ext_func_mode(device_t dev)
+{
+ unsigned int port = dev >> 8;
+ outb(0xaa, port);
+}
-static void w83977tf_enable_serial(device_t dev, unsigned iobase)
+static void w83977tf_enable_serial(device_t dev, unsigned int 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);
}