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  1. /*
  2.  * Copyright (C) 2005 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <putchar.h>
  30. #include <arch/types.h>
  31. #include <arch/cp0.h>
  32. #include <arch/console.h>
  33.  
  34. static void cons_putchar(const char ch)
  35. {
  36.     *((char *) VIDEORAM) = ch;
  37. }
  38.  
  39.  
  40. static void serial_putchar(const char ch)
  41. {
  42.     int i;
  43.  
  44.     if (ch=='\n')
  45.         putchar('\r');
  46.  
  47.     /* Wait until transmit buffer empty */
  48.     while (! ((*SERIAL_LSR) & (1<<TRANSMIT_EMPTY_BIT)))
  49.         ;
  50.     *(SERIAL_PORT_BASE) = ch;
  51. }
  52.  
  53. static void (*putchar_func)(const char ch) = cons_putchar;
  54.  
  55. void console_init(void)
  56. {
  57.     /* The LSR on the start usually contains this value */
  58.     if (*SERIAL_LSR == 0x60)
  59.         putchar_func = serial_putchar;
  60.     else
  61.         putchar_func = cons_putchar;
  62. }
  63.  
  64. void putchar(const char ch)
  65. {
  66.     putchar_func(ch);
  67. }
  68.