| /* |
| * Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com> |
| * Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <led-display.h> |
| #include <asm/io.h> |
| |
| #ifdef CONFIG_CMD_DISPLAY |
| #define CWORD_CLEAR 0x80 |
| #define CLEAR_DELAY (110 * 2) |
| #define DISPLAY_SIZE 8 |
| |
| static int pos; /* Current display position */ |
| |
| /* Handle different display commands */ |
| void display_set(int cmd) |
| { |
| if (cmd & DISPLAY_CLEAR) { |
| out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR); |
| udelay(1000 * CLEAR_DELAY); |
| } |
| |
| if (cmd & DISPLAY_HOME) { |
| pos = 0; |
| } |
| } |
| |
| /* |
| * Display a character at the current display position. |
| * Characters beyond the display size are ignored. |
| */ |
| int display_putc(char c) |
| { |
| if (pos >= DISPLAY_SIZE) |
| return -1; |
| |
| out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c); |
| |
| return c; |
| } |
| #endif |
