arch/sparc/prom/console_32.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  * Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14 #include <asm/system.h>
  15 #include <linux/string.h>
  16
  17 extern void restore_current(void);
  18
  19 /* Non blocking get character from console input device, returns -1
  20  * if no input was taken.  This can be used for polling.
  21  */
  22 int
  23 prom_nbgetchar(void)
  24 {
  25         static char inc;
  26         int i = -1;
  27         unsigned long flags;
  28
  29         spin_lock_irqsave(&prom_lock, flags);
  30         switch(prom_vers) {
  31         case PROM_V0:
  32                 i = (*(romvec->pv_nbgetchar))();
  33                 break;
  34         case PROM_V2:
  35         case PROM_V3:
  36                 if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) {
  37                         i = inc;
  38                 } else {
  39                         i = -1;
  40                 }
  41                 break;
  42         default:
  43                 i = -1;
  44                 break;
  45         };
  46         restore_current();
  47         spin_unlock_irqrestore(&prom_lock, flags);
  48         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  49 }
  50
  51 /* Non blocking put character to console device, returns -1 if
  52  * unsuccessful.
  53  */
  54 int
  55 prom_nbputchar(char c)
  56 {
  57         static char outc;
  58         unsigned long flags;
  59         int i = -1;
  60
  61         spin_lock_irqsave(&prom_lock, flags);
  62         switch(prom_vers) {
  63         case PROM_V0:
  64                 i = (*(romvec->pv_nbputchar))(c);
  65                 break;
  66         case PROM_V2:
  67         case PROM_V3:
  68                 outc = c;
  69                 if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
  70                         i = 0;
  71                 else
  72                         i = -1;
  73                 break;
  74         default:
  75                 i = -1;
  76                 break;
  77         };
  78         restore_current();
  79         spin_unlock_irqrestore(&prom_lock, flags);
  80         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  81 }
  82
  83 /* Blocking version of get character routine above. */
  84 char
  85 prom_getchar(void)
  86 {
  87         int character;
  88         while((character = prom_nbgetchar()) == -1) ;
  89         return (char) character;
  90 }
  91
  92 /* Blocking version of put character routine above. */
  93 void
  94 prom_putchar(char c)
  95 {
  96         while(prom_nbputchar(c) == -1) ;
  97 }