drivers/serial/at91rm9200_usart.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
  34 #ifndef CONFIG_AT91_LEGACY
  35 #include <asm/io.h>
  36 #include <asm/arch/hardware.h>
  37 #define CONFIG_AT91_LEGACY
  38 #include <asm/arch-at91rm9200/AT91RM9200.h>
  39 #warning Please update to use C structur SoC access !
  40 #else
  41 #include <asm/arch/AT91RM9200.h>
  42 #endif
  43
  44 DECLARE_GLOBAL_DATA_PTR;
  45
  46 #if !defined(CONFIG_DBGU) && !defined(CONFIG_USART0) && !defined(CONFIG_USART1)
  47 #error must define one of CONFIG_DBGU or CONFIG_USART0 or CONFIG_USART1
  48 #endif
  49
  50 /* ggi thunder */
  51 #ifdef CONFIG_DBGU
  52 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;
  53 #endif
  54 #ifdef CONFIG_USART0
  55 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US0;
  56 #endif
  57 #ifdef CONFIG_USART1
  58 AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US1;
  59 #endif
  60
  61 void serial_setbrg (void)
  62 {
  63         int baudrate;
  64
  65         if ((baudrate = gd->baudrate) <= 0)
  66                 baudrate = CONFIG_BAUDRATE;
  67         /* MASTER_CLOCK/(16 * baudrate) */
  68         us->US_BRGR = (AT91C_MASTER_CLOCK >> 4) / (unsigned)baudrate;
  69 }
  70
  71 int serial_init (void)
  72 {
  73         /* make any port initializations specific to this port */
  74 #ifdef CONFIG_DBGU
  75         *AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD;    /* PA 31 & 30 */
  76         *AT91C_PMC_PCER = 1 << AT91C_ID_SYS;    /* enable clock */
  77 #endif
  78 #ifdef CONFIG_USART0
  79         *AT91C_PIOA_PDR = AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
  80         *AT91C_PMC_PCER |= 1 << AT91C_ID_USART0;        /* enable clock */
  81 #endif
  82 #ifdef CONFIG_USART1
  83         *AT91C_PIOB_PDR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
  84         *AT91C_PMC_PCER |= 1 << AT91C_ID_USART1;        /* enable clock */
  85 #endif
  86         serial_setbrg ();
  87
  88         us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
  89         us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
  90         us->US_MR =
  91                 (AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS |
  92                  AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT);
  93         us->US_IMR = ~0ul;
  94         return (0);
  95 }
  96
  97 void serial_exit (void)
  98 {
  99         us->US_CR = (AT91C_US_RSTRX | AT91C_US_RSTTX);
 100 }
 101
 102 void serial_putc (const char c)
 103 {
 104         if (c == '\n')
 105                 serial_putc ('\r');
 106         while ((us->US_CSR & AT91C_US_TXRDY) == 0);
 107         us->US_THR = c;
 108 }
 109
 110 void serial_puts (const char *s)
 111 {
 112         while (*s) {
 113                 serial_putc (*s++);
 114         }
 115 }
 116
 117 int serial_getc (void)
 118 {
 119         while ((us->US_CSR & AT91C_US_RXRDY) == 0);
 120         return us->US_RHR;
 121 }
 122
 123 int serial_tstc (void)
 124 {
 125         return ((us->US_CSR & AT91C_US_RXRDY) == AT91C_US_RXRDY);
 126 }