/* * 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> #include <sysinfo.h> #define IOBASE lib_sysinfo.ser_ioport #ifdef CONFIG_SERIAL_SET_SPEED #define DIVISOR (115200 / CONFIG_SERIAL_BAUD_RATE) #endif 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) { 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); }