release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/sgi-ip27/ip27-console.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2001, 2002 Ralf Baechle
   7  */
   8 #include <linux/init.h>
   9
  10 #include <asm/page.h>
  11 #include <asm/sn/addrs.h>
  12 #include <asm/sn/sn0/hub.h>
  13 #include <asm/sn/klconfig.h>
  14 #include <asm/sn/ioc3.h>
  15 #include <asm/sn/sn_private.h>
  16
  17 #include <linux/serial.h>
  18 #include <linux/serial_core.h>
  19
  20 #define IOC3_CLK        (22000000 / 3)
  21 #define IOC3_FLAGS      (0)
  22
  23 static inline struct ioc3_uartregs *console_uart(void)
  24 {
  25         struct ioc3 *ioc3;
  26         nasid_t nasid;
  27
  28         nasid = (master_nasid == INVALID_NASID) ? get_nasid() : master_nasid;
  29         ioc3 = (struct ioc3 *)KL_CONFIG_CH_CONS_INFO(nasid)->memory_base;
  30
  31         return &ioc3->sregs.uarta;
  32 }
  33
  34 void __init prom_putchar(char c)
  35 {
  36         struct ioc3_uartregs *uart = console_uart();
  37
  38         while ((uart->iu_lsr & 0x20) == 0);
  39         uart->iu_thr = c;
  40 }