mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
218 lines
4.3 KiB
C
218 lines
4.3 KiB
C
/*
|
|
* (C) Copyright 2004
|
|
* DAVE Srl
|
|
* http://www.dave-tech.it
|
|
* http://www.wawnet.biz
|
|
* mailto:info@wawnet.biz
|
|
*
|
|
* (C) Copyright 2002-2004
|
|
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*
|
|
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/hardware.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* flush serial input queue. returns 0 on success or negative error
|
|
* number otherwise
|
|
*/
|
|
static int serial_flush_input(void)
|
|
{
|
|
volatile u32 tmp;
|
|
|
|
/* keep on reading as long as the receiver is not empty */
|
|
while(UTRSTAT0&0x01) {
|
|
tmp = REGB(URXH0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* flush output queue. returns 0 on success or negative error number
|
|
* otherwise
|
|
*/
|
|
static int serial_flush_output(void)
|
|
{
|
|
/* wait until the transmitter is no longer busy */
|
|
while(!(UTRSTAT0 & 0x02)) {
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void serial_setbrg (void)
|
|
{
|
|
u32 divisor = 0;
|
|
|
|
/* get correct divisor */
|
|
switch(gd->baudrate) {
|
|
|
|
case 1200:
|
|
#if CONFIG_S3C44B0_CLOCK_SPEED==66
|
|
divisor = 3124;
|
|
#elif CONFIG_S3C44B0_CLOCK_SPEED==75
|
|
divisor = 3905;
|
|
#else
|
|
# error CONFIG_S3C44B0_CLOCK_SPEED undefined
|
|
#endif
|
|
break;
|
|
|
|
case 9600:
|
|
#if CONFIG_S3C44B0_CLOCK_SPEED==66
|
|
divisor = 390;
|
|
#elif CONFIG_S3C44B0_CLOCK_SPEED==75
|
|
divisor = 487;
|
|
#else
|
|
# error CONFIG_S3C44B0_CLOCK_SPEED undefined
|
|
#endif
|
|
break;
|
|
|
|
case 19200:
|
|
#if CONFIG_S3C44B0_CLOCK_SPEED==66
|
|
divisor = 194;
|
|
#elif CONFIG_S3C44B0_CLOCK_SPEED==75
|
|
divisor = 243;
|
|
#else
|
|
# error CONFIG_S3C44B0_CLOCK_SPEED undefined
|
|
#endif
|
|
break;
|
|
|
|
case 38400:
|
|
#if CONFIG_S3C44B0_CLOCK_SPEED==66
|
|
divisor = 97;
|
|
#elif CONFIG_S3C44B0_CLOCK_SPEED==75
|
|
divisor = 121;
|
|
#else
|
|
# error CONFIG_S3C44B0_CLOCK_SPEED undefined
|
|
#endif /* break; */
|
|
|
|
case 57600:
|
|
#if CONFIG_S3C44B0_CLOCK_SPEED==66
|
|
divisor = 64;
|
|
#elif CONFIG_S3C44B0_CLOCK_SPEED==75
|
|
divisor = 80;
|
|
#else
|
|
# error CONFIG_S3C44B0_CLOCK_SPEED undefined
|
|
#endif /* break; */
|
|
|
|
case 115200:
|
|
#if CONFIG_S3C44B0_CLOCK_SPEED==66
|
|
divisor = 32;
|
|
#elif CONFIG_S3C44B0_CLOCK_SPEED==75
|
|
divisor = 40;
|
|
#else
|
|
# error CONFIG_S3C44B0_CLOCK_SPEED undefined
|
|
#endif /* break; */
|
|
}
|
|
|
|
serial_flush_output();
|
|
serial_flush_input();
|
|
UFCON0 = 0x0;
|
|
ULCON0 = 0x03;
|
|
UCON0 = 0x05;
|
|
UBRDIV0 = divisor;
|
|
|
|
UFCON1 = 0x0;
|
|
ULCON1 = 0x03;
|
|
UCON1 = 0x05;
|
|
UBRDIV1 = divisor;
|
|
|
|
for(divisor=0; divisor<100; divisor++) {
|
|
/* NOP */
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialise the serial port with the given baudrate. The settings
|
|
* are always 8 data bits, no parity, 1 stop bit, no start bits.
|
|
*
|
|
*/
|
|
int serial_init (void)
|
|
{
|
|
serial_setbrg ();
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Output a single byte to the serial port.
|
|
*/
|
|
void serial_putc (const char c)
|
|
{
|
|
/* wait for room in the transmit FIFO */
|
|
while(!(UTRSTAT0 & 0x02));
|
|
|
|
UTXH0 = (unsigned char)c;
|
|
|
|
/*
|
|
to be polite with serial console add a line feed
|
|
to the carriage return character
|
|
*/
|
|
if (c=='\n')
|
|
serial_putc('\r');
|
|
}
|
|
|
|
/*
|
|
* Read a single byte from the serial port. Returns 1 on success, 0
|
|
* otherwise. When the function is succesfull, the character read is
|
|
* written into its argument c.
|
|
*/
|
|
int serial_tstc (void)
|
|
{
|
|
return (UTRSTAT0 & 0x01);
|
|
}
|
|
|
|
/*
|
|
* Read a single byte from the serial port. Returns 1 on success, 0
|
|
* otherwise. When the function is succesfull, the character read is
|
|
* written into its argument c.
|
|
*/
|
|
int serial_getc (void)
|
|
{
|
|
int rv;
|
|
|
|
for(;;) {
|
|
rv = serial_tstc();
|
|
|
|
if(rv > 0)
|
|
return URXH0;
|
|
}
|
|
}
|
|
|
|
void
|
|
serial_puts (const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc (*s++);
|
|
}
|
|
}
|