release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/mti-sead3/sead3-console.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  */
  19 #include <linux/console.h>
  20 #include <linux/init.h>
  21 #include <linux/serial_reg.h>
  22 #include <asm/io.h>
  23
  24
  25 #define SEAD_UART1_REGS_BASE    0xbf000800   /* ttyS1 = RS232 port */
  26 #define SEAD_UART0_REGS_BASE    0xbf000900   /* ttyS0 = USB port   */
  27
  28 #define PORT(base_addr, offset) ((unsigned int __iomem *)(base_addr+(offset)*4))
  29
  30 static inline unsigned int serial_in(int offset, unsigned int base_addr)
  31 {
  32         return __raw_readl(PORT(base_addr, offset)) & 0xff;
  33 }
  34
  35 static inline void serial_out(int offset, int value, unsigned int base_addr)
  36 {
  37         __raw_writel(value, PORT(base_addr, offset));
  38 }
  39
  40 int prom_putchar(char c, char port)
  41 {
  42         unsigned int base_addr;
  43
  44         base_addr = port ? SEAD_UART1_REGS_BASE : SEAD_UART0_REGS_BASE;
  45
  46         while ((serial_in(UART_LSR, base_addr) & UART_LSR_THRE) == 0)
  47                 ;
  48
  49         serial_out(UART_TX, c, base_addr);
  50
  51         return 1;
  52 }