release/src-rt-6.x.4708/linux/linux-2.6.36/arch/m68k/sun3/prom/console.c

   1 /*
   2  * console.c: Routines that deal with sending and receiving IO
   3  *            to/from the current console device using the PROM.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <asm/openprom.h>
  12 #include <asm/oplib.h>
  13 #include <asm/system.h>
  14 #include <linux/string.h>
  15
  16 /* Non blocking get character from console input device, returns -1
  17  * if no input was taken.  This can be used for polling.
  18  */
  19 int
  20 prom_nbgetchar(void)
  21 {
  22         int i = -1;
  23         unsigned long flags;
  24
  25         local_irq_save(flags);
  26                 i = (*(romvec->pv_nbgetchar))();
  27         local_irq_restore(flags);
  28         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  29 }
  30
  31 /* Non blocking put character to console device, returns -1 if
  32  * unsuccessful.
  33  */
  34 int
  35 prom_nbputchar(char c)
  36 {
  37         unsigned long flags;
  38         int i = -1;
  39
  40         local_irq_save(flags);
  41                 i = (*(romvec->pv_nbputchar))(c);
  42         local_irq_restore(flags);
  43         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  44 }
  45
  46 /* Blocking version of get character routine above. */
  47 char
  48 prom_getchar(void)
  49 {
  50         int character;
  51         while((character = prom_nbgetchar()) == -1) ;
  52         return (char) character;
  53 }
  54
  55 /* Blocking version of put character routine above. */
  56 void
  57 prom_putchar(char c)
  58 {
  59         while(prom_nbputchar(c) == -1) ;
  60         return;
  61 }
  62
  63 /* Query for input device type */
  64
  65 /* Query for output device type */