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/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
  23static 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
  34void prom_putchar(char c)
  35{
  36        struct ioc3_uartregs *uart = console_uart();
  37
  38        while ((readb(&uart->iu_lsr) & 0x20) == 0)
  39                ;
  40        writeb(c, &uart->iu_thr);
  41}
  42