serial.c

U BOOT源码

/*
 * (C) Copyright 2002
 * Lineo, Inc <www.lineo.com>
 * Bernhard Kuhn <[e-mail]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <[e-mail]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <[e-mail]>
 *
 * Copyright (C) 1999 2000 2001 Erik Mouw ([e-mail])
 *
 * 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/io.h>
#include <asm/arch/hardware.h>

/* ggi thunder */
AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;

void serial_setbrg(void)
  {
  DECLARE_GLOBAL_DATA_PTR;
  int baudrate;

  if ((baudrate = gd->bd->bi_baudrate) <= 0)
    baudrate = CONFIG_BAUDRATE;
  us->US_BRGR = 33 /* AT91C_MASTER_CLOCK / baudrate / 16 */; /* hardcode so no __divsi3 */
  }

int serial_init(void)
  {
  /* make any port initializations specific to this port */
  *AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD;  /* PA 31 & 30 */
  *AT91C_PMC_PCER = 1 << AT91C_ID_SYS;  /* enable clock */
  serial_setbrg();

  us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
  us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
  us->US_MR = ( AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT );
  us->US_IMR = ~0ul;
  return (0);
  }

void serial_putc(const char c)
  {
  if (c == '\n')
    serial_putc('\r');
  while( (us->US_CSR & AT91C_US_TXRDY) == 0 )
    ;
  us->US_THR=c;
  }

void
serial_puts (const char *s)
  {
  while (*s)
    {
    serial_putc (*s++);
    }
  }

int serial_getc(void)
  {
  while( (us->US_CSR & AT91C_US_RXRDY) == 0 );
  return us->US_RHR;
  }

int serial_tstc(void)
  {
  return ((us->US_CSR & AT91C_US_RXRDY) == AT91C_US_RXRDY);
  }