LXR uboot/drivers/serial/serial

   1/*
   2 * (C) Copyright 2002
   3 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
   4 *
   5 * (C) Copyright 2002
   6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7 * Marius Groeger <mgroeger@sysgo.de>
   8 *
   9 * (C) Copyright 2002
  10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  11 * Alex Zuepke <azu@sysgo.de>
  12 *
  13 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
  14 *
  15 * This program is free software; you can redistribute it and/or modify
  16 * it under the terms of the GNU General Public License as published by
  17 * the Free Software Foundation; either version 2 of the License, or
  18 * (at your option) any later version.
  19 *
  20 * This program is distributed in the hope that it will be useful,
  21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 * GNU General Public License for more details.
  24 *
  25 * You should have received a copy of the GNU General Public License
  26 * along with this program; if not, write to the Free Software
  27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28 *
  29 */
  30
  31#include <common.h>
  32#include <SA-1100.h>
  33
  34DECLARE_GLOBAL_DATA_PTR;
  35
  36void serial_setbrg (void)
  37{
  38        unsigned int reg = 0;
  39
  40        if (gd->baudrate == 1200)
  41                reg = 191;
  42        else if (gd->baudrate == 9600)
  43                reg = 23;
  44        else if (gd->baudrate == 19200)
  45                reg = 11;
  46        else if (gd->baudrate == 38400)
  47                reg = 5;
  48        else if (gd->baudrate == 57600)
  49                reg = 3;
  50        else if (gd->baudrate == 115200)
  51                reg = 1;
  52        else
  53                hang ();
  54
  55#ifdef CONFIG_SERIAL1
  56        /* SA1110 uart function */
  57        Ser1SDCR0 |= SDCR0_SUS;
  58
  59        /* Wait until port is ready ... */
  60        while(Ser1UTSR1 & UTSR1_TBY) {}
  61
  62        /* init serial serial 1 */
  63        Ser1UTCR3 = 0x00;
  64        Ser1UTSR0 = 0xff;
  65        Ser1UTCR0 = ( UTCR0_1StpBit | UTCR0_8BitData );
  66        Ser1UTCR1 = 0;
  67        Ser1UTCR2 = (u32)reg;
  68        Ser1UTCR3 = ( UTCR3_RXE | UTCR3_TXE );
  69#elif defined(CONFIG_SERIAL3)
  70        /* Wait until port is ready ... */
  71        while (Ser3UTSR1 & UTSR1_TBY) {
  72        }
  73
  74        /* init serial serial 3 */
  75        Ser3UTCR3 = 0x00;
  76        Ser3UTSR0 = 0xff;
  77        Ser3UTCR0 = (UTCR0_1StpBit | UTCR0_8BitData);
  78        Ser3UTCR1 = 0;
  79        Ser3UTCR2 = (u32) reg;
  80        Ser3UTCR3 = (UTCR3_RXE | UTCR3_TXE);
  81#else
  82#error "Bad: you didn't configured serial ..."
  83#endif
  84}
  85
  86
  87/*
  88 * Initialise the serial port with the given baudrate. The settings
  89 * are always 8 data bits, no parity, 1 stop bit, no start bits.
  90 *
  91 */
  92int serial_init (void)
  93{
  94        serial_setbrg ();
  95
  96        return (0);
  97}
  98
  99
 100/*
 101 * Output a single byte to the serial port.
 102 */
 103void serial_putc (const char c)
 104{
 105#ifdef CONFIG_SERIAL1
 106        /* wait for room in the tx FIFO on SERIAL1 */
 107        while ((Ser1UTSR0 & UTSR0_TFS) == 0);
 108
 109        Ser1UTDR = c;
 110#elif defined(CONFIG_SERIAL3)
 111        /* wait for room in the tx FIFO on SERIAL3 */
 112        while ((Ser3UTSR0 & UTSR0_TFS) == 0);
 113
 114        Ser3UTDR = c;
 115#endif
 116
 117        /* If \n, also do \r */
 118        if (c == '\n')
 119                serial_putc ('\r');
 120}
 121
 122/*
 123 * Read a single byte from the serial port. Returns 1 on success, 0
 124 * otherwise. When the function is succesfull, the character read is
 125 * written into its argument c.
 126 */
 127int serial_tstc (void)
 128{
 129#ifdef CONFIG_SERIAL1
 130        return Ser1UTSR1 & UTSR1_RNE;
 131#elif defined(CONFIG_SERIAL3)
 132        return Ser3UTSR1 & UTSR1_RNE;
 133#endif
 134}
 135
 136/*
 137 * Read a single byte from the serial port. Returns 1 on success, 0
 138 * otherwise. When the function is succesfull, the character read is
 139 * written into its argument c.
 140 */
 141int serial_getc (void)
 142{
 143#ifdef CONFIG_SERIAL1
 144        while (!(Ser1UTSR1 & UTSR1_RNE));
 145
 146        return (char) Ser1UTDR & 0xff;
 147#elif defined(CONFIG_SERIAL3)
 148        while (!(Ser3UTSR1 & UTSR1_RNE));
 149
 150        return (char) Ser3UTDR & 0xff;
 151#endif
 152}
 153
 154void
 155serial_puts (const char *s)
 156{
 157        while (*s) {
 158                serial_putc (*s++);
 159        }
 160}
 161