arch/sparc/prom/init.c

   1 /*
   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  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14 #include <asm/sun4prom.h>
  15
  16 struct linux_romvec *romvec;
  17 enum prom_major_version prom_vers;
  18 unsigned int prom_rev, prom_prev;
  19 linux_sun4_romvec *sun4_romvec;
  20
  21 /* The root node of the prom device tree. */
  22 int prom_root_node;
  23
  24 /* Pointer to the device tree operations structure. */
  25 struct linux_nodeops *prom_nodeops;
  26
  27 /* You must call prom_init() before you attempt to use any of the
  28  * routines in the prom library.  It returns 0 on success, 1 on
  29  * failure.  It gets passed the pointer to the PROM vector.
  30  */
  31
  32 extern void prom_meminit(void);
  33 extern void prom_ranges_init(void);
  34
  35 void __init prom_init(struct linux_romvec *rp)
  36 {
  37 #ifdef CONFIG_SUN4
  38         extern struct linux_romvec *sun4_prom_init(void);
  39         rp = sun4_prom_init();
  40 #endif
  41         romvec = rp;
  42
  43         switch(romvec->pv_romvers) {
  44         case 0:
  45                 prom_vers = PROM_V0;
  46                 break;
  47         case 2:
  48                 prom_vers = PROM_V2;
  49                 break;
  50         case 3:
  51                 prom_vers = PROM_V3;
  52                 break;
  53         case 40:
  54                 prom_vers = PROM_SUN4;
  55                 break;
  56         default:
  57                 prom_printf("PROMLIB: Bad PROM version %d\n",
  58                             romvec->pv_romvers);
  59                 prom_halt();
  60                 break;
  61         };
  62
  63         prom_rev = romvec->pv_plugin_revision;
  64         prom_prev = romvec->pv_printrev;
  65         prom_nodeops = romvec->pv_nodeops;
  66
  67         prom_root_node = prom_getsibling(0);
  68         if((prom_root_node == 0) || (prom_root_node == -1))
  69                 prom_halt();
  70
  71         if((((unsigned long) prom_nodeops) == 0) ||
  72            (((unsigned long) prom_nodeops) == -1))
  73                 prom_halt();
  74
  75         prom_meminit();
  76
  77         prom_ranges_init();
  78
  79 #ifndef CONFIG_SUN4
  80         /* SUN4 prints this in sun4_prom_init */
  81         printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  82                romvec->pv_romvers, prom_rev);
  83 #endif
  84
  85         /* Initialization successful. */
  86         return;
  87 }