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
  24 static 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
  35 void 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 }