arch/sparc/prom/misc.c

   1 /* $Id: misc.c,v 1.18 2000/08/26 02:38:03 anton Exp $
   2  * misc.c:  Miscellaneous prom functions that don't belong
   3  *          anywhere else.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/config.h>
   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/auxio.h>
  15 #include <asm/system.h>
  16
  17 extern void restore_current(void);
  18
  19 DEFINE_SPINLOCK(prom_lock);
  20
  21 /* Reset and reboot the machine with the command 'bcommand'. */
  22 void
  23 prom_reboot(char *bcommand)
  24 {
  25         unsigned long flags;
  26         spin_lock_irqsave(&prom_lock, flags);
  27         (*(romvec->pv_reboot))(bcommand);
  28         /* Never get here. */
  29         restore_current();
  30         spin_unlock_irqrestore(&prom_lock, flags);
  31 }
  32
  33 /* Forth evaluate the expression contained in 'fstring'. */
  34 void
  35 prom_feval(char *fstring)
  36 {
  37         unsigned long flags;
  38         if(!fstring || fstring[0] == 0)
  39                 return;
  40         spin_lock_irqsave(&prom_lock, flags);
  41         if(prom_vers == PROM_V0)
  42                 (*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
  43         else
  44                 (*(romvec->pv_fortheval.v2_eval))(fstring);
  45         restore_current();
  46         spin_unlock_irqrestore(&prom_lock, flags);
  47 }
  48
  49 /* We want to do this more nicely some day. */
  50 extern void (*prom_palette)(int);
  51
  52 /* Drop into the prom, with the chance to continue with the 'go'
  53  * prom command.
  54  */
  55 void
  56 prom_cmdline(void)
  57 {
  58         extern void install_obp_ticker(void);
  59         extern void install_linux_ticker(void);
  60         unsigned long flags;
  61
  62         if(!serial_console && prom_palette)
  63                 prom_palette (1);
  64         spin_lock_irqsave(&prom_lock, flags);
  65         install_obp_ticker();
  66         (*(romvec->pv_abort))();
  67         restore_current();
  68         install_linux_ticker();
  69         spin_unlock_irqrestore(&prom_lock, flags);
  70 #ifdef CONFIG_SUN_AUXIO
  71         set_auxio(AUXIO_LED, 0);
  72 #endif
  73         if(!serial_console && prom_palette)
  74                 prom_palette (0);
  75 }
  76
  77 /* Drop into the prom, but completely terminate the program.
  78  * No chance of continuing.
  79  */
  80 void
  81 prom_halt(void)
  82 {
  83         unsigned long flags;
  84 again:
  85         spin_lock_irqsave(&prom_lock, flags);
  86         (*(romvec->pv_halt))();
  87         /* Never get here. */
  88         restore_current();
  89         spin_unlock_irqrestore(&prom_lock, flags);
  90         goto again; /* PROM is out to get me -DaveM */
  91 }
  92
  93 typedef void (*sfunc_t)(void);
  94
  95 /* Set prom sync handler to call function 'funcp'. */
  96 void
  97 prom_setsync(sfunc_t funcp)
  98 {
  99         if(!funcp) return;
 100         *romvec->pv_synchook = funcp;
 101 }
 102
 103 /* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
 104  * format type.  'num_bytes' is the number of bytes that your idbuf
 105  * has space for.  Returns 0xff on error.
 106  */
 107 unsigned char
 108 prom_get_idprom(char *idbuf, int num_bytes)
 109 {
 110         int len;
 111
 112         len = prom_getproplen(prom_root_node, "idprom");
 113         if((len>num_bytes) || (len==-1)) return 0xff;
 114         if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
 115                 return idbuf[0];
 116
 117         return 0xff;
 118 }
 119
 120 /* Get the major prom version number. */
 121 int
 122 prom_version(void)
 123 {
 124         return romvec->pv_romvers;
 125 }
 126
 127 /* Get the prom plugin-revision. */
 128 int
 129 prom_getrev(void)
 130 {
 131         return prom_rev;
 132 }
 133
 134 /* Get the prom firmware print revision. */
 135 int
 136 prom_getprev(void)
 137 {
 138         return prom_prev;
 139 }