text: /*
   *  This program is free software; you can redistribute it and/or modify it
   *  under the terms of the GNU General Public License version 2 as published
   *  by the Free Software Foundation.
   *
   *  Copyright (C) 2010 John Crispin <john@phrozen.org>
   */
  
  #include <linux/cpu.h>
  #include <lantiq_soc.h>
  
  #define ASC_BUF		1024
  #define LTQ_ASC_FSTAT	((u32 *)(LTQ_EARLY_ASC + 0x0048))
  #ifdef __BIG_ENDIAN
  #define LTQ_ASC_TBUF	((u32 *)(LTQ_EARLY_ASC + 0x0020 + 3))
  #else
  #define LTQ_ASC_TBUF	((u32 *)(LTQ_EARLY_ASC + 0x0020))
  #endif
  #define TXMASK		0x3F00
  #define TXOFFSET	8
  
  void prom_putchar(char c)
  {
  	unsigned long flags;
  
  	local_irq_save(flags);
  	do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET);
  	if (c == '\n')
  		ltq_w8('\r', LTQ_ASC_TBUF);
  	ltq_w8(c, LTQ_ASC_TBUF);
  	local_irq_restore(flags);
  }
  