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/config.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14
  15 struct linux_romvec *romvec;
  16 enum prom_major_version prom_vers;
  17 unsigned int prom_rev, prom_prev;
  18
  19 /* The root node of the prom device tree. */
  20 int prom_root_node;
  21
  22 /* Pointer to the device tree operations structure. */
  23 struct linux_nodeops *prom_nodeops;
  24
  25 /* You must call prom_init() before you attempt to use any of the
  26  * routines in the prom library.  It returns 0 on success, 1 on
  27  * failure.  It gets passed the pointer to the PROM vector.
  28  */
  29
  30 extern void prom_meminit(void);
  31 extern void prom_ranges_init(void);
  32
  33 void __init prom_init(struct linux_romvec *rp)
  34 {
  35 #ifdef CONFIG_AP1000
  36         extern struct linux_romvec *ap_prom_init(void);
  37         rp = ap_prom_init();
  38 #endif
  39
  40         romvec = rp;
  41 #ifndef CONFIG_SUN3
  42         switch(romvec->pv_romvers) {
  43         case 0:
  44                 prom_vers = PROM_V0;
  45                 break;
  46         case 2:
  47                 prom_vers = PROM_V2;
  48                 break;
  49         case 3:
  50                 prom_vers = PROM_V3;
  51                 break;
  52         case 4:
  53                 prom_vers = PROM_P1275;
  54                 prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n");
  55                 prom_halt();
  56                 break;
  57         case 42: /* why not :-) */
  58                 prom_vers = PROM_AP1000;
  59                 break;
  60
  61         default:
  62                 prom_printf("PROMLIB: Bad PROM version %d\n",
  63                             romvec->pv_romvers);
  64                 prom_halt();
  65                 break;
  66         };
  67
  68         prom_rev = romvec->pv_plugin_revision;
  69         prom_prev = romvec->pv_printrev;
  70         prom_nodeops = romvec->pv_nodeops;
  71
  72         prom_root_node = prom_getsibling(0);
  73         if((prom_root_node == 0) || (prom_root_node == -1))
  74                 prom_halt();
  75
  76         if((((unsigned long) prom_nodeops) == 0) ||
  77            (((unsigned long) prom_nodeops) == -1))
  78                 prom_halt();
  79
  80         prom_meminit();
  81
  82         prom_ranges_init();
  83 #endif
  84 //      printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  85 //             romvec->pv_romvers, prom_rev);
  86
  87         /* Initialization successful. */
  88         return;
  89 }