LXR linux/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
   9#include <asm/page.h>
  10#include <asm/setup.h>
  11#include <asm/sn/addrs.h>
  12#include <asm/sn/agent.h>
  13#include <asm/sn/klconfig.h>
  14#include <asm/sn/ioc3.h>
  15
  16#include <linux/serial.h>
  17#include <linux/serial_core.h>
  18
  19#include "ip27-common.h"
  20
  21#define IOC3_CLK        (22000000 / 3)
  22#define IOC3_FLAGS      (0)
  23
  24static inline struct ioc3_uartregs *console_uart(void)
  25{
  26        struct ioc3 *ioc3;
  27        nasid_t nasid;
  28
  29        nasid = (master_nasid == INVALID_NASID) ? get_nasid() : master_nasid;
  30        ioc3 = (struct ioc3 *)KL_CONFIG_CH_CONS_INFO(nasid)->memory_base;
  31
  32        return &ioc3->sregs.uarta;
  33}
  34
  35void prom_putchar(char c)
  36{
  37        struct ioc3_uartregs *uart = console_uart();
  38
  39        while ((readb(&uart->iu_lsr) & 0x20) == 0)
  40                ;
  41        writeb(c, &uart->iu_thr);
  42}
  43