kernel/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 <linux/string.h>
  14
  15 /* Non blocking get character from console input device, returns -1
  16  * if no input was taken.  This can be used for polling.
  17  */
  18 int
  19 prom_nbgetchar(void)
  20 {
  21         int i = -1;
  22         unsigned long flags;
  23
  24         local_irq_save(flags);
  25                 i = (*(romvec->pv_nbgetchar))();
  26         local_irq_restore(flags);
  27         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  28 }
  29
  30 /* Non blocking put character to console device, returns -1 if
  31  * unsuccessful.
  32  */
  33 int
  34 prom_nbputchar(char c)
  35 {
  36         unsigned long flags;
  37         int i = -1;
  38
  39         local_irq_save(flags);
  40                 i = (*(romvec->pv_nbputchar))(c);
  41         local_irq_restore(flags);
  42         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  43 }
  44
  45 /* Blocking version of get character routine above. */
  46 char
  47 prom_getchar(void)
  48 {
  49         int character;
  50         while((character = prom_nbgetchar()) == -1) ;
  51         return (char) character;
  52 }
  53
  54 /* Blocking version of put character routine above. */
  55 void
  56 prom_putchar(char c)
  57 {
  58         while(prom_nbputchar(c) == -1) ;
  59         return;
  60 }
  61
  62 /* Query for input device type */
  63 #if 0
  64 enum prom_input_device
  65 prom_query_input_device()
  66 {
  67         unsigned long flags;
  68         int st_p;
  69         char propb[64];
  70         char *p;
  71
  72         switch(prom_vers) {
  73         case PROM_V0:
  74         case PROM_V2:
  75         default:
  76                 switch(*romvec->pv_stdin) {
  77                 case PROMDEV_KBD:       return PROMDEV_IKBD;
  78                 case PROMDEV_TTYA:      return PROMDEV_ITTYA;
  79                 case PROMDEV_TTYB:      return PROMDEV_ITTYB;
  80                 default:
  81                         return PROMDEV_I_UNK;
  82                 };
  83         case PROM_V3:
  84         case PROM_P1275:
  85                 local_irq_save(flags);
  86                 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin);
  87                 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
  88                                      "r" (&current_set[smp_processor_id()]) :
  89                                      "memory");
  90                 local_irq_restore(flags);
  91                 if(prom_node_has_property(st_p, "keyboard"))
  92                         return PROMDEV_IKBD;
  93                 prom_getproperty(st_p, "device_type", propb, sizeof(propb));
  94                 if(strncmp(propb, "serial", sizeof("serial")))
  95                         return PROMDEV_I_UNK;
  96                 prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb));
  97                 p = propb;
  98                 while(*p) p++; p -= 2;
  99                 if(p[0] == ':') {
 100                         if(p[1] == 'a')
 101                                 return PROMDEV_ITTYA;
 102                         else if(p[1] == 'b')
 103                                 return PROMDEV_ITTYB;
 104                 }
 105                 return PROMDEV_I_UNK;
 106         };
 107 }
 108 #endif
 109
 110 /* Query for output device type */
 111
 112 #if 0
 113 enum prom_output_device
 114 prom_query_output_device()
 115 {
 116         unsigned long flags;
 117         int st_p;
 118         char propb[64];
 119         char *p;
 120         int propl;
 121
 122         switch(prom_vers) {
 123         case PROM_V0:
 124                 switch(*romvec->pv_stdin) {
 125                 case PROMDEV_SCREEN:    return PROMDEV_OSCREEN;
 126                 case PROMDEV_TTYA:      return PROMDEV_OTTYA;
 127                 case PROMDEV_TTYB:      return PROMDEV_OTTYB;
 128                 };
 129                 break;
 130         case PROM_V2:
 131         case PROM_V3:
 132         case PROM_P1275:
 133                 local_irq_save(flags);
 134                 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout);
 135                 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
 136                                      "r" (&current_set[smp_processor_id()]) :
 137                                      "memory");
 138                 local_irq_restore(flags);
 139                 propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
 140                 if (propl >= 0 && propl == sizeof("display") &&
 141                         strncmp("display", propb, sizeof("display")) == 0)
 142                 {
 143                         return PROMDEV_OSCREEN;
 144                 }
 145                 if(prom_vers == PROM_V3) {
 146                         if(strncmp("serial", propb, sizeof("serial")))
 147                                 return PROMDEV_O_UNK;
 148                         prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb));
 149                         p = propb;
 150                         while(*p) p++; p -= 2;
 151                         if(p[0]==':') {
 152                                 if(p[1] == 'a')
 153                                         return PROMDEV_OTTYA;
 154                                 else if(p[1] == 'b')
 155                                         return PROMDEV_OTTYB;
 156                         }
 157                         return PROMDEV_O_UNK;
 158                 } else {
 159                         /* This works on SS-2 (an early OpenFirmware) still. */
 160                         switch(*romvec->pv_stdin) {
 161                         case PROMDEV_TTYA:      return PROMDEV_OTTYA;
 162                         case PROMDEV_TTYB:      return PROMDEV_OTTYB;
 163                         };
 164                 }
 165                 break;
 166         };
 167         return PROMDEV_O_UNK;
 168 }
 169 #endif