src/superio/winbond/w83977tf/w83977tf_early_serial.c


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#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 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);
}