cpu/at91rm9200/serial.c

   1 /*
   2  * (C) Copyright 2002
   3  * Lineo, Inc <www.lineo.com>
   4  * Bernhard Kuhn <bkuhn@lineo.com>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Marius Groeger <mgroeger@sysgo.de>
   9  *
  10  * (C) Copyright 2002
  11  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  12  * Alex Zuepke <azu@sysgo.de>
  13  *
  14  * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  *
  30  */
  31
  32 #include <common.h>
  33 #include <asm/io.h>
  34 #include <asm/arch/hardware.h>
  35
  36 /* ggi thunder */
  37 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;
  38
  39 void serial_setbrg(void)
  40   {
  41   DECLARE_GLOBAL_DATA_PTR;
  42   int baudrate;
  43
  44   if ((baudrate = gd->bd->bi_baudrate) <= 0)
  45     baudrate = CONFIG_BAUDRATE;
  46   us->US_BRGR = 33 /* AT91C_MASTER_CLOCK / baudrate / 16 */; /* hardcode so no __divsi3 */
  47   }
  48
  49 int serial_init(void)
  50   {
  51   /* make any port initializations specific to this port */
  52   *AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD;  /* PA 31 & 30 */
  53   *AT91C_PMC_PCER = 1 << AT91C_ID_SYS;  /* enable clock */
  54   serial_setbrg();
  55
  56   us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
  57   us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
  58   us->US_MR = ( AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT );
  59   us->US_IMR = ~0ul;
  60   return (0);
  61   }
  62
  63 void serial_putc(const char c)
  64   {
  65   if (c == '\n')
  66     serial_putc('\r');
  67   while( (us->US_CSR & AT91C_US_TXRDY) == 0 )
  68     ;
  69   us->US_THR=c;
  70   }
  71
  72 void
  73 serial_puts (const char *s)
  74   {
  75   while (*s)
  76     {
  77     serial_putc (*s++);
  78     }
  79   }
  80
  81 int serial_getc(void)
  82   {
  83   while( (us->US_CSR & AT91C_US_RXRDY) == 0 );
  84   return us->US_RHR;
  85   }
  86
  87 int serial_tstc(void)
  88   {
  89   return ((us->US_CSR & AT91C_US_RXRDY) == AT91C_US_RXRDY);
  90   }