blob: 59db7d971cab6cdcd79cb94cbb6a8dbf6602b11a [file] [log] [blame]
Stefan Roese85056932016-01-19 14:05:10 +01001/*
2 * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <asm/io.h>
9#include <asm/pnp_def.h>
10
11#define WINBOND_ENTRY_KEY 0x87
12#define WINBOND_EXIT_KEY 0xaa
13
14/* Enable configuration: pass entry key '0x87' into index port dev twice */
15static void pnp_enter_conf_state(u16 dev)
16{
17 u16 port = dev >> 8;
18
19 outb(WINBOND_ENTRY_KEY, port);
20 outb(WINBOND_ENTRY_KEY, port);
21}
22
23/* Disable configuration: pass exit key '0xAA' into index port dev */
24static void pnp_exit_conf_state(u16 dev)
25{
26 u16 port = dev >> 8;
27
28 outb(WINBOND_EXIT_KEY, port);
29}
30
31/* Bring up early serial debugging output before the RAM is initialized */
32void winbond_enable_serial(uint dev, uint iobase, uint irq)
33{
34 pnp_enter_conf_state(dev);
35 pnp_set_logical_device(dev);
36 pnp_set_enable(dev, 0);
37 pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
38 pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
39 pnp_set_enable(dev, 1);
40 pnp_exit_conf_state(dev);
41}