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/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/spinlock.h>
  24 #include <asm/io.h>
  25
  26 #ifdef CONFIG_MIPS_ATLAS
  27 #include <asm/mips-boards/atlas.h>
  28
  29 #ifdef CONFIG_CPU_LITTLE_ENDIAN
  30 #define PORT(offset) (ATLAS_UART_REGS_BASE     + ((offset)<<3))
  31 #else
  32 #define PORT(offset) (ATLAS_UART_REGS_BASE + 3 + ((offset)<<3))
  33 #endif
  34
  35 #elif defined(CONFIG_MIPS_SEAD)
  36
  37 #include <asm/mips-boards/sead.h>
  38
  39 #ifdef CONFIG_CPU_LITTLE_ENDIAN
  40 #define PORT(offset) (SEAD_UART0_REGS_BASE     + ((offset)<<3))
  41 #else
  42 #define PORT(offset) (SEAD_UART0_REGS_BASE + 3 + ((offset)<<3))
  43 #endif
  44
  45 #else
  46
  47 #define PORT(offset) (0x3f8 + (offset))
  48
  49 #endif
  50
  51 static inline unsigned int serial_in(int offset)
  52 {
  53         return inb(PORT(offset));
  54 }
  55
  56 static inline void serial_out(int offset, int value)
  57 {
  58         outb(value, PORT(offset));
  59 }
  60
  61 int prom_putchar(char c)
  62 {
  63         while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
  64                 ;
  65
  66         serial_out(UART_TX, c);
  67
  68         return 1;
  69 }
  70
  71 char prom_getchar(void)
  72 {
  73         while (!(serial_in(UART_LSR) & UART_LSR_DR))
  74                 ;
  75
  76         return serial_in(UART_RX);
  77 }
  78