arch/mn10300/kernel/mn10300-debug.c

   1 /* Debugging stuff for the MN10300-based processors
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/sched.h>
  12 #include <asm/serial-regs.h>
  13
  14 #undef MN10300_CONSOLE_ON_SERIO
  15
  16 /*
  17  * write a string directly through one of the serial ports on-board the MN10300
  18  */
  19 #ifdef MN10300_CONSOLE_ON_SERIO
  20 void debug_to_serial_mnser(const char *p, int n)
  21 {
  22         char ch;
  23
  24         for (; n > 0; n--) {
  25                 ch = *p++;
  26
  27 #if MN10300_CONSOLE_ON_SERIO == 0
  28                 while (SC0STR & (SC01STR_TBF)) continue;
  29                 SC0TXB = ch;
  30                 while (SC0STR & (SC01STR_TBF)) continue;
  31                 if (ch == 0x0a) {
  32                         SC0TXB = 0x0d;
  33                         while (SC0STR & (SC01STR_TBF)) continue;
  34                 }
  35
  36 #elif MN10300_CONSOLE_ON_SERIO == 1
  37                 while (SC1STR & (SC01STR_TBF)) continue;
  38                 SC1TXB = ch;
  39                 while (SC1STR & (SC01STR_TBF)) continue;
  40                 if (ch == 0x0a) {
  41                         SC1TXB = 0x0d;
  42                         while (SC1STR & (SC01STR_TBF)) continue;
  43                 }
  44
  45 #elif MN10300_CONSOLE_ON_SERIO == 2
  46                 while (SC2STR & (SC2STR_TBF)) continue;
  47                 SC2TXB = ch;
  48                 while (SC2STR & (SC2STR_TBF)) continue;
  49                 if (ch == 0x0a) {
  50                         SC2TXB = 0x0d;
  51                         while (SC2STR & (SC2STR_TBF)) continue;
  52                 }
  53
  54 #endif
  55         }
  56 }
  57 #endif
  58