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Commit | Line | Data |
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85056932 SR |
1 | /* |
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 */ | |
15 | static 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 */ | |
24 | static 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 */ | |
32 | void 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 | } |