LXR uboot/drivers/serial/altera_jtag

   1/*
   2 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
   3 * Scott McNutt <smcnutt@psyent.com>
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24#include <common.h>
  25#include <watchdog.h>
  26#include <asm/io.h>
  27#include <nios2-io.h>
  28
  29DECLARE_GLOBAL_DATA_PTR;
  30
  31/*------------------------------------------------------------------
  32 * JTAG acts as the serial port
  33 *-----------------------------------------------------------------*/
  34static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
  35
  36void serial_setbrg( void ){ return; }
  37int serial_init( void ) { return(0);}
  38
  39void serial_putc (char c)
  40{
  41        while (1) {
  42                unsigned st = readl(&jtag->control);
  43                if (NIOS_JTAG_WSPACE(st))
  44                        break;
  45#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
  46                if (!(st & NIOS_JTAG_AC)) /* no connection */
  47                        return;
  48#endif
  49                WATCHDOG_RESET();
  50        }
  51        writel ((unsigned char)c, &jtag->data);
  52}
  53
  54void serial_puts (const char *s)
  55{
  56        while (*s != 0)
  57                serial_putc (*s++);
  58}
  59
  60int serial_tstc (void)
  61{
  62        return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
  63}
  64
  65int serial_getc (void)
  66{
  67        int c;
  68        unsigned val;
  69
  70        while (1) {
  71                WATCHDOG_RESET ();
  72                val = readl (&jtag->data);
  73                if (val & NIOS_JTAG_RVALID)
  74                        break;
  75        }
  76        c = val & 0x0ff;
  77        return (c);
  78}
  79