arch/sparc64/prom/console.c

   1 /* console.c: Routines that deal with sending and receiving IO
   2  *            to/from the current console device using the PROM.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
   5  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   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 extern int prom_stdin, prom_stdout;
  17
  18 /* Non blocking get character from console input device, returns -1
  19  * if no input was taken.  This can be used for polling.
  20  */
  21 inline int
  22 prom_nbgetchar(void)
  23 {
  24         char inc;
  25
  26         if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
  27                               P1275_INOUT(3,1),
  28                               prom_stdin, &inc, P1275_SIZE(1)) == 1)
  29                 return inc;
  30         else
  31                 return -1;
  32 }
  33
  34 /* Non blocking put character to console device, returns -1 if
  35  * unsuccessful.
  36  */
  37 inline int
  38 prom_nbputchar(char c)
  39 {
  40         char outc;
  41
  42         outc = c;
  43         if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
  44                                P1275_INOUT(3,1),
  45                                prom_stdout, &outc, P1275_SIZE(1)) == 1)
  46                 return 0;
  47         else
  48                 return -1;
  49 }
  50
  51 /* Blocking version of get character routine above. */
  52 char
  53 prom_getchar(void)
  54 {
  55         int character;
  56         while((character = prom_nbgetchar()) == -1) ;
  57         return (char) character;
  58 }
  59
  60 /* Blocking version of put character routine above. */
  61 void
  62 prom_putchar(char c)
  63 {
  64         prom_nbputchar(c);
  65         return;
  66 }
  67
  68 void
  69 prom_puts(const char *s, int len)
  70 {
  71         p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
  72                            P1275_INOUT(3,1),
  73                            prom_stdout, s, P1275_SIZE(len));
  74 }