cpu/sa1100/serial.c

   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
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 void 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  */
  92 int 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  */
 103 void 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  */
 127 int 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  */
 141 int 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
 154 void
 155 serial_puts (const char *s)
 156 {
 157         while (*s) {
 158                 serial_putc (*s++);
 159         }
 160 }