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7f0d241d IY |
1 | /* |
2 | * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com> | |
3 | * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com> | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
7f0d241d IY |
6 | */ |
7 | ||
8 | #include <common.h> | |
9 | #include <led-display.h> | |
10 | #include <asm/io.h> | |
11 | ||
12 | #ifdef CONFIG_CMD_DISPLAY | |
13 | #define CWORD_CLEAR 0x80 | |
14 | #define CLEAR_DELAY (110 * 2) | |
15 | #define DISPLAY_SIZE 8 | |
16 | ||
17 | static int pos; /* Current display position */ | |
18 | ||
19 | /* Handle different display commands */ | |
20 | void display_set(int cmd) | |
21 | { | |
22 | if (cmd & DISPLAY_CLEAR) { | |
23 | out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR); | |
24 | udelay(1000 * CLEAR_DELAY); | |
25 | } | |
26 | ||
27 | if (cmd & DISPLAY_HOME) { | |
28 | pos = 0; | |
29 | } | |
30 | } | |
31 | ||
32 | /* | |
33 | * Display a character at the current display position. | |
34 | * Characters beyond the display size are ignored. | |
35 | */ | |
36 | int display_putc(char c) | |
37 | { | |
38 | if (pos >= DISPLAY_SIZE) | |
39 | return -1; | |
40 | ||
41 | out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c); | |
42 | ||
43 | return c; | |
44 | } | |
45 | #endif |