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
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 void 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  */
  69 int 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  */
  80 void 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 * CFG_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  */
 101 int 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  */
 111 int serial_getc (void)
 112 {
 113         while (IO_SYSFLG1 & SYSFLG1_URXFE);
 114
 115         return IO_UARTDR1 & 0xff;
 116 }
 117
 118 void
 119 serial_puts (const char *s)
 120 {
 121         while (*s) {
 122                 serial_putc (*s++);
 123         }
 124 }
 125
 126 #elif defined(CONFIG_LPC2292)
 127
 128 DECLARE_GLOBAL_DATA_PTR;
 129
 130 #include <asm/arch/hardware.h>
 131
 132 void 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
 156 int 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
 170 void 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
 182 int serial_getc (void)
 183 {
 184         while((GET8(U0LSR) & 1) == 0);
 185         return GET8(U0RBR);
 186 }
 187
 188 void
 189 serial_puts (const char *s)
 190 {
 191         while (*s) {
 192                 serial_putc (*s++);
 193         }
 194 }
 195
 196 /* Test if there is a byte to read */
 197 int serial_tstc (void)
 198 {
 199         return (GET8(U0LSR) & 1);
 200 }
 201
 202 #endif