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 #include <linux/console.h>
  10 #include <linux/kdev_t.h>
  11 #include <linux/major.h>
  12 #include <linux/termios.h>
  13 #include <linux/sched.h>
  14 #include <linux/tty.h>
  15
  16 #include <asm/page.h>
  17 #include <asm/semaphore.h>
  18 #include <asm/sn/addrs.h>
  19 #include <asm/sn/sn0/hub.h>
  20 #include <asm/sn/klconfig.h>
  21 #include <asm/sn/ioc3.h>
  22 #include <asm/sn/sn_private.h>
  23
  24 #include <linux/serial.h>
  25 #include <linux/serial_core.h>
  26
  27 #define IOC3_CLK        (22000000 / 3)
  28 #define IOC3_FLAGS      (0)
  29
  30 static inline struct ioc3_uartregs *console_uart(void)
  31 {
  32         struct ioc3 *ioc3;
  33         nasid_t nasid;
  34
  35         nasid = (master_nasid == INVALID_NASID) ? get_nasid() : master_nasid;
  36         ioc3 = (struct ioc3 *)KL_CONFIG_CH_CONS_INFO(nasid)->memory_base;
  37
  38         return &ioc3->sregs.uarta;
  39 }
  40
  41 void prom_putchar(char c)
  42 {
  43         struct ioc3_uartregs *uart = console_uart();
  44
  45         while ((uart->iu_lsr & 0x20) == 0);
  46         uart->iu_thr = c;
  47 }
  48
  49 static void ioc3_console_write(struct console *con, const char *s, unsigned n)
  50 {
  51         while (n-- && *s) {
  52                 if (*s == '\n')
  53                         prom_putchar('\r');
  54                 prom_putchar(*s);
  55                 s++;
  56         }
  57 }
  58
  59 static struct console ioc3_console = {
  60         .name   = "ioc3",
  61         .write  = ioc3_console_write,
  62         .flags  = CON_PRINTBUFFER | CON_BOOT,
  63         .index  = -1
  64 };
  65
  66 __init void ip27_setup_console(void)
  67 {
  68         register_console(&ioc3_console);
  69 }
  70
  71 void __init disable_early_printk(void)
  72 {
  73         unregister_console(&ioc3_console);
  74 }