1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <common.h>
8*4882a593Smuzhiyun #include <asm/io.h>
9*4882a593Smuzhiyun #include <asm/pnp_def.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #define WINBOND_ENTRY_KEY 0x87
12*4882a593Smuzhiyun #define WINBOND_EXIT_KEY 0xaa
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /* Enable configuration: pass entry key '0x87' into index port dev twice */
pnp_enter_conf_state(u16 dev)15*4882a593Smuzhiyun static void pnp_enter_conf_state(u16 dev)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun u16 port = dev >> 8;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun outb(WINBOND_ENTRY_KEY, port);
20*4882a593Smuzhiyun outb(WINBOND_ENTRY_KEY, port);
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun /* Disable configuration: pass exit key '0xAA' into index port dev */
pnp_exit_conf_state(u16 dev)24*4882a593Smuzhiyun static void pnp_exit_conf_state(u16 dev)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun u16 port = dev >> 8;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun outb(WINBOND_EXIT_KEY, port);
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun /* Bring up early serial debugging output before the RAM is initialized */
winbond_enable_serial(uint dev,uint iobase,uint irq)32*4882a593Smuzhiyun void winbond_enable_serial(uint dev, uint iobase, uint irq)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun pnp_enter_conf_state(dev);
35*4882a593Smuzhiyun pnp_set_logical_device(dev);
36*4882a593Smuzhiyun pnp_set_enable(dev, 0);
37*4882a593Smuzhiyun pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
38*4882a593Smuzhiyun pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
39*4882a593Smuzhiyun pnp_set_enable(dev, 1);
40*4882a593Smuzhiyun pnp_exit_conf_state(dev);
41*4882a593Smuzhiyun }
42