text: /*
   * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
   * Scott McNutt <smcnutt@psyent.com>
   *
   * 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 <watchdog.h>
  #include <nios-io.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  /*------------------------------------------------------------------
   * JTAG acts as the serial port
   *-----------------------------------------------------------------*/
  #if defined(CONFIG_CONSOLE_JTAG)
  
  static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
  
  void serial_setbrg( void ){ return; }
  int serial_init( void ) { return(0);}
  
  void serial_putc (char c)
  {
  	while ((jtag->txcntl & NIOS_JTAG_TRDY) != 0)
  		WATCHDOG_RESET ();
  	jtag->txcntl = NIOS_JTAG_TRDY | (unsigned char)c;
  }
  
  void serial_puts (const char *s)
  {
  	while (*s != 0)
  		serial_putc (*s++);
  }
  
  int serial_tstc (void)
  {
  	return (jtag->rxcntl & NIOS_JTAG_RRDY);
  }
  
  int serial_getc (void)
  {
  	int c;
  	while (serial_tstc() == 0)
  		WATCHDOG_RESET ();
  	c = jtag->rxcntl & 0x0ff;
  	jtag->rxcntl = 0;
  	return (c);
  }
  
  /*------------------------------------------------------------------
   * UART the serial port
   *-----------------------------------------------------------------*/
  #else
  
  static nios_uart_t *uart = (nios_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
  
  #if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
  
  /* Everything's already setup for fixed-baud PTF
   * assignment
   */
  void serial_setbrg (void){ return; }
  int serial_init (void) { return (0);}
  
  #else
  
  void serial_setbrg (void)
  {
  	unsigned div;
  
  	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
  	uart->divisor = div;
  	return;
  }
  
  int serial_init (void)
  {
  	serial_setbrg ();
  	return (0);
  }
  
  #endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
  
  
  /*-----------------------------------------------------------------------
   * UART CONSOLE
   *---------------------------------------------------------------------*/
  void serial_putc (char c)
  {
  	if (c == '\n')
  		serial_putc ('\r');
  	while ((uart->status & NIOS_UART_TRDY) == 0)
  		WATCHDOG_RESET ();
  	uart->txdata = (unsigned char)c;
  }
  
  void serial_puts (const char *s)
  {
  	while (*s != 0) {
  		serial_putc (*s++);
  	}
  }
  
  int serial_tstc (void)
  {
  	return (uart->status & NIOS_UART_RRDY);
  }
  
  int serial_getc (void)
  {
  	while (serial_tstc () == 0)
  		WATCHDOG_RESET ();
  	return( uart->rxdata & 0x00ff );
  }
  
  #endif /* CONFIG_JTAG_CONSOLE */
  