coreboot-kgpe-d16/payloads/libpayload/drivers/serial.c

/*
 * This file is part of the libpayload project.
 *
 * Copyright (C) 2008 Advanced Micro Devices, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <libpayload.h>

#define IOBASE lib_sysinfo.ser_ioport

#ifdef CONFIG_SERIAL_SET_SPEED
#define DIVISOR (115200 / CONFIG_SERIAL_BAUD_RATE)
#endif

/* This is a hack - we convert the drawing characters to ASCII */

static unsigned char translate_special_chars(unsigned char c)
{
	switch(c) {
	case 196:
		return '-';
	case 179:
		return '|';
	case 218:
	case 191:
	case 192:
	case 217:
		return '+';
	default:
		return ' ';
	}
}

void serial_init(void)
{
#ifdef CONFIG_SERIAL_SET_SPEED
	unsigned char reg;

	/* Disable interrupts. */
	outb(0, IOBASE + 0x01);

	/* Assert RTS and DTR. */
	outb(3, IOBASE + 0x04);

	/* Set the divisor latch. */
	reg = inb(IOBASE + 0x03);
	outb(reg | 0x80, IOBASE + 0x03);

	/* Write the divisor. */
	outb(DIVISOR & 0xFF, IOBASE);
	outb(DIVISOR >> 8 & 0xFF, IOBASE + 1);

	/* Restore the previous value of the divisor. */
	outb(reg &= ~0x80, IOBASE + 0x03);
#endif
}

void serial_putchar(unsigned char c)
{
	if (c > 127)
		c = translate_special_chars(c);

	while ((inb(IOBASE + 0x05) & 0x20) == 0) ;
	outb(c, IOBASE);
}

int serial_havechar(void)
{
	return inb(IOBASE + 0x05) & 0x01;
}

int serial_getchar(void)
{
	while (!serial_havechar()) ;
	return (int)inb(IOBASE);
}

/*  These are thinly veiled vt100 functions used by curses */

#define VT100_CLEAR       "\e[H\e[J"
#define VT100_SBOLD       "\e[7m"
#define VT100_EBOLD       "\e[m"
#define VT100_CURSOR_ADDR "\e[%d;%dH"

static void serial_putcmd(char *str)
{
	while(*str)
		serial_putchar(*(str++));
}

void serial_clear(void)
{
	serial_putcmd(VT100_CLEAR);
}

void serial_start_bold(void)
{
	serial_putcmd(VT100_SBOLD);
}

void serial_end_bold(void)
{
	serial_putcmd(VT100_EBOLD);
}

void serial_set_cursor(int y, int x)
{
	char buffer[32];
	snprintf(buffer, sizeof(buffer), VT100_CURSOR_ADDR, y, x);
	serial_putcmd(buffer);
}