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/*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <command.h>
#include <watchdog.h>
#include <asm/mcfuart.h>
#ifdef CONFIG_M5271
#include <asm/m5271.h>
#endif
#ifdef CONFIG_M5272
#include <asm/m5272.h>
#endif
#ifdef CONFIG_M5282
#include <asm/m5282.h>
#endif
#ifdef CONFIG_M5249
#include <asm/m5249.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_M5249) || defined(CONFIG_M5271)
#define DoubleClock(a) ((double)(CFG_CLK/2) / 32.0 / (double)(a))
#else
#define DoubleClock(a) ((double)(CFG_CLK) / 32.0 / (double)(a))
#endif
void rs_serial_setbaudrate(int port,int baudrate)
{
#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5271)
volatile unsigned char *uartp;
#ifndef CONFIG_M5271
double fraction;
#endif
double clock;
if (port == 0)
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
else
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE2);
clock = DoubleClock(baudrate); /* Set baud above */
uartp[MCFUART_UBG1] = (((int)clock >> 8) & 0xff); /* set msb baud */
uartp[MCFUART_UBG2] = ((int)clock & 0xff); /* set lsb baud */
#ifndef CONFIG_M5271
fraction = ((clock - (int)clock) * 16.0) + 0.5;
uartp[MCFUART_UFPD] = ((int)fraction & 0xf); /* set baud fraction adjust */
#endif
#endif
};
void rs_serial_init(int port,int baudrate)
{
volatile unsigned char *uartp;
/*
* Reset UART, get it into known state...
*/
if (port == 0)
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
else
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE2);
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR; /* reset Error pointer */
/*
* Set port for CONSOLE_BAUD_RATE, 8 data bits, 1 stop bit, no parity.
*/
uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
/* Mask UART interrupts */
uartp[MCFUART_UIMR] = 0;
/* Set clock Select Register: Tx/Rx clock is timer */
uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
rs_serial_setbaudrate(port,baudrate);
/* Enable Tx/Rx */
uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
return;
}
/****************************************************************************/
/*
* Output a single character, using UART polled mode.
* This is used for console output.
*/
void rs_put_char(char ch)
{
volatile unsigned char *uartp;
int i;
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
for (i = 0; (i < 0x10000); i++) {
if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
break;
}
uartp[MCFUART_UTB] = ch;
return;
}
int rs_is_char(void)
{
volatile unsigned char *uartp;
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
return((uartp[MCFUART_USR] & MCFUART_USR_RXREADY) ? 1 : 0);
}
int rs_get_char(void)
{
volatile unsigned char *uartp;
uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
return(uartp[MCFUART_URB]);
}
void serial_setbrg(void) {
rs_serial_setbaudrate(0,gd->bd->bi_baudrate);
}
int serial_init(void) {
rs_serial_init(0,gd->baudrate);
return 0;
}
void serial_putc(const char c) {
if (c == '\n')
serial_putc ('\r');
rs_put_char(c);
}
void serial_puts (const char *s) {
while (*s) {
serial_putc(*s++);
}
}
int serial_getc(void) {
while(!rs_is_char())
WATCHDOG_RESET();
return rs_get_char();
}
int serial_tstc() {
return rs_is_char();
}
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