release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/loongson/common/uart_base.c

   1 /*
   2  * Copyright (C) 2009 Lemote Inc.
   3  * Author: Wu Zhangjin, wuzhangjin@gmail.com
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <asm/bootinfo.h>
  13
  14 #include <loongson.h>
  15
  16 /* ioremapped */
  17 unsigned long _loongson_uart_base;
  18 EXPORT_SYMBOL(_loongson_uart_base);
  19 /* raw */
  20 unsigned long loongson_uart_base;
  21 EXPORT_SYMBOL(loongson_uart_base);
  22
  23 void prom_init_loongson_uart_base(void)
  24 {
  25         switch (mips_machtype) {
  26         case MACH_LEMOTE_FL2E:
  27                 loongson_uart_base = LOONGSON_PCIIO_BASE + 0x3f8;
  28                 break;
  29         case MACH_LEMOTE_FL2F:
  30         case MACH_LEMOTE_LL2F:
  31                 loongson_uart_base = LOONGSON_PCIIO_BASE + 0x2f8;
  32                 break;
  33         case MACH_LEMOTE_ML2F7:
  34         case MACH_LEMOTE_YL2F89:
  35         case MACH_DEXXON_GDIUM2F10:
  36         case MACH_LEMOTE_NAS:
  37         default:
  38                 /* The CPU provided serial port */
  39                 loongson_uart_base = LOONGSON_LIO1_BASE + 0x3f8;
  40                 break;
  41         }
  42
  43         _loongson_uart_base =
  44                 (unsigned long)ioremap_nocache(loongson_uart_base, 8);
  45 }