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