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   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 #if 0
  65 enum prom_input_device
  66 prom_query_input_device()
  67 {
  68         unsigned long flags;
  69         int st_p;
  70         char propb[64];
  71         char *p;
  72
  73         switch(prom_vers) {
  74         case PROM_V0:
  75         case PROM_V2:
  76         default:
  77                 switch(*romvec->pv_stdin) {
  78                 case PROMDEV_KBD:       return PROMDEV_IKBD;
  79                 case PROMDEV_TTYA:      return PROMDEV_ITTYA;
  80                 case PROMDEV_TTYB:      return PROMDEV_ITTYB;
  81                 default:
  82                         return PROMDEV_I_UNK;
  83                 };
  84         case PROM_V3:
  85         case PROM_P1275:
  86                 local_irq_save(flags);
  87                 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin);
  88                 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
  89                                      "r" (&current_set[smp_processor_id()]) :
  90                                      "memory");
  91                 local_irq_restore(flags);
  92                 if(prom_node_has_property(st_p, "keyboard"))
  93                         return PROMDEV_IKBD;
  94                 prom_getproperty(st_p, "device_type", propb, sizeof(propb));
  95                 if(strncmp(propb, "serial", sizeof("serial")))
  96                         return PROMDEV_I_UNK;
  97                 prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb));
  98                 p = propb;
  99                 while(*p) p++; p -= 2;
 100                 if(p[0] == ':') {
 101                         if(p[1] == 'a')
 102                                 return PROMDEV_ITTYA;
 103                         else if(p[1] == 'b')
 104                                 return PROMDEV_ITTYB;
 105                 }
 106                 return PROMDEV_I_UNK;
 107         };
 108 }
 109 #endif
 110
 111 /* Query for output device type */
 112
 113 #if 0
 114 enum prom_output_device
 115 prom_query_output_device()
 116 {
 117         unsigned long flags;
 118         int st_p;
 119         char propb[64];
 120         char *p;
 121         int propl;
 122
 123         switch(prom_vers) {
 124         case PROM_V0:
 125                 switch(*romvec->pv_stdin) {
 126                 case PROMDEV_SCREEN:    return PROMDEV_OSCREEN;
 127                 case PROMDEV_TTYA:      return PROMDEV_OTTYA;
 128                 case PROMDEV_TTYB:      return PROMDEV_OTTYB;
 129                 };
 130                 break;
 131         case PROM_V2:
 132         case PROM_V3:
 133         case PROM_P1275:
 134                 local_irq_save(flags);
 135                 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout);
 136                 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
 137                                      "r" (&current_set[smp_processor_id()]) :
 138                                      "memory");
 139                 local_irq_restore(flags);
 140                 propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
 141                 if (propl >= 0 && propl == sizeof("display") &&
 142                         strncmp("display", propb, sizeof("display")) == 0)
 143                 {
 144                         return PROMDEV_OSCREEN;
 145                 }
 146                 if(prom_vers == PROM_V3) {
 147                         if(strncmp("serial", propb, sizeof("serial")))
 148                                 return PROMDEV_O_UNK;
 149                         prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb));
 150                         p = propb;
 151                         while(*p) p++; p -= 2;
 152                         if(p[0]==':') {
 153                                 if(p[1] == 'a')
 154                                         return PROMDEV_OTTYA;
 155                                 else if(p[1] == 'b')
 156                                         return PROMDEV_OTTYB;
 157                         }
 158                         return PROMDEV_O_UNK;
 159                 } else {
 160                         /* This works on SS-2 (an early OpenFirmware) still. */
 161                         switch(*romvec->pv_stdin) {
 162                         case PROMDEV_TTYA:      return PROMDEV_OTTYA;
 163                         case PROMDEV_TTYB:      return PROMDEV_OTTYB;
 164                         };
 165                 }
 166                 break;
 167         };
 168         return PROMDEV_O_UNK;
 169 }
 170 #endif