arch/sparc/prom/console.c

   1 /* $Id: console.c,v 1.25 2001/10/30 04:54:22 davem Exp $
   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/sun4prom.h>
  14 #include <asm/oplib.h>
  15 #include <asm/system.h>
  16 #include <linux/string.h>
  17
  18 extern void restore_current(void);
  19
  20 static char con_name_jmc[] = "/obio/su@"; /* "/obio/su@0,3002f8"; */
  21 #define CON_SIZE_JMC    (sizeof(con_name_jmc))
  22
  23 /* Non blocking get character from console input device, returns -1
  24  * if no input was taken.  This can be used for polling.
  25  */
  26 int
  27 prom_nbgetchar(void)
  28 {
  29         static char inc;
  30         int i = -1;
  31         unsigned long flags;
  32
  33         spin_lock_irqsave(&prom_lock, flags);
  34         switch(prom_vers) {
  35         case PROM_V0:
  36         case PROM_SUN4:
  37                 i = (*(romvec->pv_nbgetchar))();
  38                 break;
  39         case PROM_V2:
  40         case PROM_V3:
  41                 if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) {
  42                         i = inc;
  43                 } else {
  44                         i = -1;
  45                 }
  46                 break;
  47         default:
  48                 i = -1;
  49                 break;
  50         };
  51         restore_current();
  52         spin_unlock_irqrestore(&prom_lock, flags);
  53         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  54 }
  55
  56 /* Non blocking put character to console device, returns -1 if
  57  * unsuccessful.
  58  */
  59 int
  60 prom_nbputchar(char c)
  61 {
  62         static char outc;
  63         unsigned long flags;
  64         int i = -1;
  65
  66         spin_lock_irqsave(&prom_lock, flags);
  67         switch(prom_vers) {
  68         case PROM_V0:
  69         case PROM_SUN4:
  70                 i = (*(romvec->pv_nbputchar))(c);
  71                 break;
  72         case PROM_V2:
  73         case PROM_V3:
  74                 outc = c;
  75                 if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
  76                         i = 0;
  77                 else
  78                         i = -1;
  79                 break;
  80         default:
  81                 i = -1;
  82                 break;
  83         };
  84         restore_current();
  85         spin_unlock_irqrestore(&prom_lock, flags);
  86         return i; /* Ugh, we could spin forever on unsupported proms ;( */
  87 }
  88
  89 /* Blocking version of get character routine above. */
  90 char
  91 prom_getchar(void)
  92 {
  93         int character;
  94         while((character = prom_nbgetchar()) == -1) ;
  95         return (char) character;
  96 }
  97
  98 /* Blocking version of put character routine above. */
  99 void
 100 prom_putchar(char c)
 101 {
 102         while(prom_nbputchar(c) == -1) ;
 103         return;
 104 }
 105
 106 /* Query for input device type */
 107 enum prom_input_device
 108 prom_query_input_device(void)
 109 {
 110         unsigned long flags;
 111         int st_p;
 112         char propb[64];
 113         char *p;
 114         int propl;
 115
 116         switch(prom_vers) {
 117         case PROM_V0:
 118         case PROM_V2:
 119         case PROM_SUN4:
 120         default:
 121                 switch(*romvec->pv_stdin) {
 122                 case PROMDEV_KBD:       return PROMDEV_IKBD;
 123                 case PROMDEV_TTYA:      return PROMDEV_ITTYA;
 124                 case PROMDEV_TTYB:      return PROMDEV_ITTYB;
 125                 default:
 126                         return PROMDEV_I_UNK;
 127                 };
 128         case PROM_V3:
 129                 spin_lock_irqsave(&prom_lock, flags);
 130                 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin);
 131                 restore_current();
 132                 spin_unlock_irqrestore(&prom_lock, flags);
 133                 if(prom_node_has_property(st_p, "keyboard"))
 134                         return PROMDEV_IKBD;
 135                 if (prom_getproperty(st_p, "name", propb, sizeof(propb)) != -1) {
 136                         if(strncmp(propb, "keyboard", sizeof("serial")) == 0)
 137                                 return PROMDEV_IKBD;
 138                 }
 139                 if (prom_getproperty(st_p, "device_type", propb, sizeof(propb)) != -1) {
 140                 if(strncmp(propb, "serial", sizeof("serial")))
 141                         return PROMDEV_I_UNK;
 142                 }
 143                 propl = prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb));
 144                 if(propl > 2) {
 145                         p = propb;
 146                         while(*p) p++; p -= 2;
 147                         if(p[0] == ':') {
 148                                 if(p[1] == 'a')
 149                                         return PROMDEV_ITTYA;
 150                                 else if(p[1] == 'b')
 151                                         return PROMDEV_ITTYB;
 152                         }
 153                 }
 154                 return PROMDEV_I_UNK;
 155         }
 156 }
 157
 158 /* Query for output device type */
 159
 160 enum prom_output_device
 161 prom_query_output_device(void)
 162 {
 163         unsigned long flags;
 164         int st_p;
 165         char propb[64];
 166         char *p;
 167         int propl;
 168
 169         switch(prom_vers) {
 170         case PROM_V0:
 171         case PROM_SUN4:
 172                 switch(*romvec->pv_stdin) {
 173                 case PROMDEV_SCREEN:    return PROMDEV_OSCREEN;
 174                 case PROMDEV_TTYA:      return PROMDEV_OTTYA;
 175                 case PROMDEV_TTYB:      return PROMDEV_OTTYB;
 176                 };
 177                 break;
 178         case PROM_V2:
 179         case PROM_V3:
 180                 spin_lock_irqsave(&prom_lock, flags);
 181                 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout);
 182                 restore_current();
 183                 spin_unlock_irqrestore(&prom_lock, flags);
 184                 propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
 185                 if (propl == sizeof("display") &&
 186                         strncmp("display", propb, sizeof("display")) == 0)
 187                 {
 188                         return PROMDEV_OSCREEN;
 189                 }
 190                 if(prom_vers == PROM_V3) {
 191                         if(propl >= 0 &&
 192                             strncmp("serial", propb, sizeof("serial")) != 0)
 193                                 return PROMDEV_O_UNK;
 194                         propl = prom_getproperty(prom_root_node, "stdout-path",
 195                                                  propb, sizeof(propb));
 196                         if(propl == CON_SIZE_JMC &&
 197                             strncmp(propb, con_name_jmc, CON_SIZE_JMC) == 0)
 198                                 return PROMDEV_OTTYA;
 199                         if(propl > 2) {
 200                                 p = propb;
 201                                 while(*p) p++; p-= 2;
 202                                 if(p[0]==':') {
 203                                         if(p[1] == 'a')
 204                                                 return PROMDEV_OTTYA;
 205                                         else if(p[1] == 'b')
 206                                                 return PROMDEV_OTTYB;
 207                                 }
 208                         }
 209                 } else {
 210                         switch(*romvec->pv_stdin) {
 211                         case PROMDEV_TTYA:      return PROMDEV_OTTYA;
 212                         case PROMDEV_TTYB:      return PROMDEV_OTTYB;
 213                         };
 214                 }
 215                 break;
 216         default:
 217                 ;
 218         };
 219         return PROMDEV_O_UNK;
 220 }