mirror of
https://xff.cz/git/u-boot/
synced 2025-10-31 02:15:45 +01:00
96bd462942
enables the RTS signal with CONFIG_SERIAL_RTS_ACTIVE. No handshaking is done, but the active RTS signal allows to connect to the target using a PC which is using RTS/CTS handshake, and does no harm if the PC is set to ignore RTS. Signed-off-by: Michael Schwingen <michael@schwingen.org>
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* 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/arch/ixp425.h>
|
|
|
|
/*
|
|
* 14.7456 MHz
|
|
* Baud Rate = --------------
|
|
* 16 x Divisor
|
|
*/
|
|
#define SERIAL_CLOCK 921600
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
void serial_setbrg (void)
|
|
{
|
|
unsigned int quot = 0;
|
|
int uart = CFG_IXP425_CONSOLE;
|
|
|
|
if ((gd->baudrate <= SERIAL_CLOCK) && (SERIAL_CLOCK % gd->baudrate == 0))
|
|
quot = SERIAL_CLOCK / gd->baudrate;
|
|
else
|
|
hang ();
|
|
|
|
IER(uart) = 0; /* Disable for now */
|
|
FCR(uart) = 0; /* No fifos enabled */
|
|
|
|
/* set baud rate */
|
|
LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
|
|
DLL(uart) = quot & 0xff;
|
|
DLH(uart) = quot >> 8;
|
|
LCR(uart) = LCR_WLS0 | LCR_WLS1;
|
|
#ifdef CONFIG_SERIAL_RTS_ACTIVE
|
|
MCR(uart) = MCR_RTS; /* set RTS active */
|
|
#else
|
|
MCR(uart) = 0; /* set RTS inactive */
|
|
#endif
|
|
IER(uart) = IER_UUE;
|
|
}
|
|
|
|
/*
|
|
* 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 tx FIFO on UART */
|
|
while ((LSR(CFG_IXP425_CONSOLE) & LSR_TEMT) == 0);
|
|
|
|
THR(CFG_IXP425_CONSOLE) = c;
|
|
|
|
/* If \n, also do \r */
|
|
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 LSR(CFG_IXP425_CONSOLE) & LSR_DR;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
while (!(LSR(CFG_IXP425_CONSOLE) & LSR_DR));
|
|
|
|
return (char) RBR(CFG_IXP425_CONSOLE) & 0xff;
|
|
}
|
|
|
|
void
|
|
serial_puts (const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc (*s++);
|
|
}
|
|
}
|