2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
5 * Copyright (C) 2008 Ulf Jordan <jordan@chalmers.se>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <libpayload-config.h>
32 #include <libpayload.h>
34 #define IOBASE lib_sysinfo.ser_ioport
35 #define DIVISOR(x) (115200 / x)
37 void serial_hardware_init(int port, int speed, int word_bits, int parity, int stop_bits)
41 /* We will assume 8n1 for now. Does anyone use anything else these days? */
43 /* Disable interrupts. */
46 /* Assert RTS and DTR. */
49 /* Set the divisor latch. */
50 reg = inb(port + 0x03);
51 outb(reg | 0x80, port + 0x03);
53 /* Write the divisor. */
54 outb(DIVISOR(speed) & 0xFF, port);
55 outb(DIVISOR(speed) >> 8 & 0xFF, port + 1);
57 /* Restore the previous value of the divisor. */
58 outb(reg & ~0x80, port + 0x03);
61 static struct console_input_driver consin = {
62 .havekey = serial_havechar,
63 .getchar = serial_getchar
66 static struct console_output_driver consout = {
67 .putchar = serial_putchar
70 void serial_init(void)
72 #ifdef CONFIG_SERIAL_SET_SPEED
73 serial_hardware_init(IOBASE, CONFIG_SERIAL_BAUD_RATE, 8, 0, 1);
75 console_add_input_driver(&consin);
76 console_add_output_driver(&consout);
79 void serial_putchar(unsigned int c)
82 while ((inb(IOBASE + 0x05) & 0x20) == 0) ;
86 int serial_havechar(void)
88 return inb(IOBASE + 0x05) & 0x01;
91 int serial_getchar(void)
93 while (!serial_havechar()) ;
94 return (int)inb(IOBASE);
97 /* These are thinly veiled vt100 functions used by curses */
99 #define VT100_CLEAR "\e[H\e[J"
100 /* These defines will fail if you use bold and reverse at the same time.
101 * Switching off one of them will switch off both. tinycurses knows about
102 * this and does the right thing.
104 #define VT100_SBOLD "\e[1m"
105 #define VT100_EBOLD "\e[m"
106 #define VT100_SREVERSE "\e[7m"
107 #define VT100_EREVERSE "\e[m"
108 #define VT100_CURSOR_ADDR "\e[%d;%dH"
109 #define VT100_CURSOR_ON "\e[?25l"
110 #define VT100_CURSOR_OFF "\e[?25h"
111 /* The following smacs/rmacs are actually for xterm; a real vt100 has
112 enacs=\E(B\E)0, smacs=^N, rmacs=^O. */
113 #define VT100_SMACS "\e(0"
114 #define VT100_RMACS "\e(B"
115 /* A vt100 doesn't do color, setaf/setab below are from xterm-color. */
116 #define VT100_SET_COLOR "\e[3%d;4%dm"
118 static void serial_putcmd(char *str)
121 serial_putchar(*(str++));
124 void serial_clear(void)
126 serial_putcmd(VT100_CLEAR);
129 void serial_start_bold(void)
131 serial_putcmd(VT100_SBOLD);
134 void serial_end_bold(void)
136 serial_putcmd(VT100_EBOLD);
139 void serial_start_reverse(void)
141 serial_putcmd(VT100_SREVERSE);
144 void serial_end_reverse(void)
146 serial_putcmd(VT100_EREVERSE);
149 void serial_start_altcharset(void)
151 serial_putcmd(VT100_SMACS);
154 void serial_end_altcharset(void)
156 serial_putcmd(VT100_RMACS);
160 * Set the foreground and background colors on the serial console.
162 * @param fg Foreground color number.
163 * @param bg Background color number.
165 void serial_set_color(short fg, short bg)
168 snprintf(buffer, sizeof(buffer), VT100_SET_COLOR, fg, bg);
169 serial_putcmd(buffer);
172 void serial_set_cursor(int y, int x)
175 snprintf(buffer, sizeof(buffer), VT100_CURSOR_ADDR, y + 1, x + 1);
176 serial_putcmd(buffer);
179 void serial_cursor_enable(int state)
182 serial_putcmd(VT100_CURSOR_ON);
184 serial_putcmd(VT100_CURSOR_OFF);