arch/m68k/sun3/prom/init.c

   1 /* $Id: init.c,v 1.9 1996/12/18 06:46:55 tridge Exp $
   2  * init.c:  Initialize internal variables used by the PROM
   3  *          library functions.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10
  11 #include <asm/openprom.h>
  12 #include <asm/oplib.h>
  13
  14 struct linux_romvec *romvec;
  15 enum prom_major_version prom_vers;
  16 unsigned int prom_rev, prom_prev;
  17
  18 /* The root node of the prom device tree. */
  19 int prom_root_node;
  20
  21 /* Pointer to the device tree operations structure. */
  22 struct linux_nodeops *prom_nodeops;
  23
  24 /* You must call prom_init() before you attempt to use any of the
  25  * routines in the prom library.  It returns 0 on success, 1 on
  26  * failure.  It gets passed the pointer to the PROM vector.
  27  */
  28
  29 extern void prom_meminit(void);
  30 extern void prom_ranges_init(void);
  31
  32 void __init prom_init(struct linux_romvec *rp)
  33 {
  34 #ifdef CONFIG_AP1000
  35         extern struct linux_romvec *ap_prom_init(void);
  36         rp = ap_prom_init();
  37 #endif
  38
  39         romvec = rp;
  40 #ifndef CONFIG_SUN3
  41         switch(romvec->pv_romvers) {
  42         case 0:
  43                 prom_vers = PROM_V0;
  44                 break;
  45         case 2:
  46                 prom_vers = PROM_V2;
  47                 break;
  48         case 3:
  49                 prom_vers = PROM_V3;
  50                 break;
  51         case 4:
  52                 prom_vers = PROM_P1275;
  53                 prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n");
  54                 prom_halt();
  55                 break;
  56         case 42: /* why not :-) */
  57                 prom_vers = PROM_AP1000;
  58                 break;
  59
  60         default:
  61                 prom_printf("PROMLIB: Bad PROM version %d\n",
  62                             romvec->pv_romvers);
  63                 prom_halt();
  64                 break;
  65         };
  66
  67         prom_rev = romvec->pv_plugin_revision;
  68         prom_prev = romvec->pv_printrev;
  69         prom_nodeops = romvec->pv_nodeops;
  70
  71         prom_root_node = prom_getsibling(0);
  72         if((prom_root_node == 0) || (prom_root_node == -1))
  73                 prom_halt();
  74
  75         if((((unsigned long) prom_nodeops) == 0) ||
  76            (((unsigned long) prom_nodeops) == -1))
  77                 prom_halt();
  78
  79         prom_meminit();
  80
  81         prom_ranges_init();
  82 #endif
  83 //      printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  84 //             romvec->pv_romvers, prom_rev);
  85
  86         /* Initialization successful. */
  87         return;
  88 }