mirror of
https://github.com/AsahiLinux/u-boot
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110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
/*
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* (C) Copyright 2004, Freescale, Inc
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* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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/*
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* Minimal serial functions needed to use one of the PSC ports
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* as serial console interface.
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*/
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#include <common.h>
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#include <mpc8220.h>
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#if defined (CONFIG_EXTUART_CONSOLE)
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# include <ns16550.h>
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# define PADSERIAL_BAUD_115200 0x40
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# define PADSERIAL_BAUD_57600 0x20
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# define PADSERIAL_BAUD_9600 0
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# define PADCARD_FREQ 18432000
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const NS16550_t com_port = (NS16550_t) CFG_NS16550_COM1;
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int ext_serial_init (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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volatile u8 *dipswitch = (volatile u8 *) (CFG_CPLD_BASE + 0x1002);
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int baud_divisor;
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/* Find out the baud rate speed on debug card dip switches */
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if (*dipswitch & PADSERIAL_BAUD_115200)
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gd->baudrate = 115200;
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else if (*dipswitch & PADSERIAL_BAUD_57600)
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gd->baudrate = 57600;
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else
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gd->baudrate = 9600;
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/* Debug card frequency */
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baud_divisor = PADCARD_FREQ / (16 * gd->baudrate);
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NS16550_init (com_port, baud_divisor);
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return (0);
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}
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void ext_serial_putc (const char c)
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{
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if (c == '\n')
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NS16550_putc (com_port, '\r');
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NS16550_putc (com_port, c);
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}
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void ext_serial_puts (const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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}
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int ext_serial_getc (void)
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{
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return NS16550_getc (com_port);
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}
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int ext_serial_tstc (void)
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{
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return NS16550_tstc (com_port);
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}
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void ext_serial_setbrg (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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volatile u8 *dipswitch = (volatile u8 *) (CFG_CPLD_BASE + 0x1002);
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int baud_divisor;
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/* Find out the baud rate speed on debug card dip switches */
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if (*dipswitch & PADSERIAL_BAUD_115200)
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gd->baudrate = 115200;
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else if (*dipswitch & PADSERIAL_BAUD_57600)
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gd->baudrate = 57600;
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else
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gd->baudrate = 9600;
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/* Debug card frequency */
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baud_divisor = PADCARD_FREQ / (16 * gd->baudrate);
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NS16550_reinit (com_port, baud_divisor);
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}
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#endif /* CONFIG_EXTUART_CONSOLE */
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