arch/mips/mips-boards/generic/printf.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  *  This program is free software; you can distribute it and/or modify it
   6  *  under the terms of the GNU General Public License (Version 2) as
   7  *  published by the Free Software Foundation.
   8  *
   9  *  This program is distributed in the hope it will be useful, but WITHOUT
  10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17  *
  18  * Putting things on the screen/serial line using YAMONs facilities.
  19  */
  20 #include <linux/config.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/serial_reg.h>
  24 #include <linux/spinlock.h>
  25 #include <asm/io.h>
  26
  27 #ifdef CONFIG_MIPS_ATLAS
  28 #include <asm/mips-boards/atlas.h>
  29
  30 #ifdef CONFIG_CPU_LITTLE_ENDIAN
  31 #define PORT(offset) (ATLAS_UART_REGS_BASE     + ((offset)<<3))
  32 #else
  33 #define PORT(offset) (ATLAS_UART_REGS_BASE + 3 + ((offset)<<3))
  34 #endif
  35
  36 #elif defined(CONFIG_MIPS_SEAD)
  37
  38 #include <asm/mips-boards/sead.h>
  39
  40 #ifdef CONFIG_CPU_LITTLE_ENDIAN
  41 #define PORT(offset) (SEAD_UART0_REGS_BASE     + ((offset)<<3))
  42 #else
  43 #define PORT(offset) (SEAD_UART0_REGS_BASE + 3 + ((offset)<<3))
  44 #endif
  45
  46 #else
  47
  48 #define PORT(offset) (0x3f8 + (offset))
  49
  50 #endif
  51
  52 static inline unsigned int serial_in(int offset)
  53 {
  54         return inb(PORT(offset));
  55 }
  56
  57 static inline void serial_out(int offset, int value)
  58 {
  59         outb(value, PORT(offset));
  60 }
  61
  62 int prom_putchar(char c)
  63 {
  64         while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
  65                 ;
  66
  67         serial_out(UART_TX, c);
  68
  69         return 1;
  70 }
  71
  72 char prom_getchar(void)
  73 {
  74         while (!(serial_in(UART_LSR) & UART_LSR_DR))
  75                 ;
  76
  77         return serial_in(UART_RX);
  78 }
  79