LXR uboot/cpu/arm720t/serial.c

   1/*
   2 * (C) Copyright 2002-2004
   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
  33#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
  34
  35#include <clps7111.h>
  36
  37DECLARE_GLOBAL_DATA_PTR;
  38
  39void serial_setbrg (void)
  40{
  41        unsigned int reg = 0;
  42
  43        switch (gd->baudrate) {
  44        case   1200:    reg = 191;      break;
  45        case   9600:    reg =  23;      break;
  46        case  19200:    reg =  11;      break;
  47        case  38400:    reg =   5;      break;
  48        case  57600:    reg =   3;      break;
  49        case 115200:    reg =   1;      break;
  50        default:        hang ();        break;
  51        }
  52
  53        /* init serial serial 1,2 */
  54        IO_SYSCON1 = SYSCON1_UART1EN;
  55        IO_SYSCON2 = SYSCON2_UART2EN;
  56
  57        reg |= UBRLCR_WRDLEN8;
  58
  59        IO_UBRLCR1 = reg;
  60        IO_UBRLCR2 = reg;
  61}
  62
  63
  64/*
  65 * Initialise the serial port with the given baudrate. The settings
  66 * are always 8 data bits, no parity, 1 stop bit, no start bits.
  67 *
  68 */
  69int serial_init (void)
  70{
  71        serial_setbrg ();
  72
  73        return (0);
  74}
  75
  76
  77/*
  78 * Output a single byte to the serial port.
  79 */
  80void serial_putc (const char c)
  81{
  82        int tmo;
  83
  84        /* If \n, also do \r */
  85        if (c == '\n')
  86                serial_putc ('\r');
  87
  88        tmo = get_timer (0) + 1 * CONFIG_SYS_HZ;
  89        while (IO_SYSFLG1 & SYSFLG1_UTXFF)
  90                if (get_timer (0) > tmo)
  91                        break;
  92
  93        IO_UARTDR1 = c;
  94}
  95
  96/*
  97 * Read a single byte from the serial port. Returns 1 on success, 0
  98 * otherwise. When the function is succesfull, the character read is
  99 * written into its argument c.
 100 */
 101int serial_tstc (void)
 102{
 103        return !(IO_SYSFLG1 & SYSFLG1_URXFE);
 104}
 105
 106/*
 107 * Read a single byte from the serial port. Returns 1 on success, 0
 108 * otherwise. When the function is succesfull, the character read is
 109 * written into its argument c.
 110 */
 111int serial_getc (void)
 112{
 113        while (IO_SYSFLG1 & SYSFLG1_URXFE);
 114
 115        return IO_UARTDR1 & 0xff;
 116}
 117
 118void
 119serial_puts (const char *s)
 120{
 121        while (*s) {
 122                serial_putc (*s++);
 123        }
 124}
 125
 126#elif defined(CONFIG_LPC2292)
 127
 128DECLARE_GLOBAL_DATA_PTR;
 129
 130#include <asm/arch/hardware.h>
 131
 132void serial_setbrg (void)
 133{
 134        unsigned short divisor = 0;
 135
 136        switch (gd->baudrate) {
 137        case   1200:    divisor = 3072; break;
 138        case   9600:    divisor =  384; break;
 139        case  19200:    divisor =  192; break;
 140        case  38400:    divisor =   96; break;
 141        case  57600:    divisor =   64; break;
 142        case 115200:    divisor =   32; break;
 143        default:        hang ();        break;
 144        }
 145
 146        /* init serial UART0 */
 147        PUT8(U0LCR, 0);
 148        PUT8(U0IER, 0);
 149        PUT8(U0LCR, 0x80);      /* DLAB=1 */
 150        PUT8(U0DLL, (unsigned char)(divisor & 0x00FF));
 151        PUT8(U0DLM, (unsigned char)(divisor >> 8));
 152        PUT8(U0LCR, 0x03);      /* 8N1, DLAB=0  */
 153        PUT8(U0FCR, 1);         /* Enable RX and TX FIFOs */
 154}
 155
 156int serial_init (void)
 157{
 158        unsigned long pinsel0;
 159
 160        serial_setbrg ();
 161
 162        pinsel0 = GET32(PINSEL0);
 163        pinsel0 &= ~(0x00000003);
 164        pinsel0 |= 5;
 165        PUT32(PINSEL0, pinsel0);
 166
 167        return (0);
 168}
 169
 170void serial_putc (const char c)
 171{
 172        if (c == '\n')
 173        {
 174                while((GET8(U0LSR) & (1<<5)) == 0); /* Wait for empty U0THR */
 175                PUT8(U0THR, '\r');
 176        }
 177
 178        while((GET8(U0LSR) & (1<<5)) == 0); /* Wait for empty U0THR */
 179        PUT8(U0THR, c);
 180}
 181
 182int serial_getc (void)
 183{
 184        while((GET8(U0LSR) & 1) == 0);
 185        return GET8(U0RBR);
 186}
 187
 188void
 189serial_puts (const char *s)
 190{
 191        while (*s) {
 192                serial_putc (*s++);
 193        }
 194}
 195
 196/* Test if there is a byte to read */
 197int serial_tstc (void)
 198{
 199        return (GET8(U0LSR) & 1);
 200}
 201
 202#endif
 203