1/* $Id: init.c,v 1.1.1.1 2007/08/03 18:51:51 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
14struct linux_romvec *romvec;
15enum prom_major_version prom_vers;
16unsigned int prom_rev, prom_prev;
17
18/* The root node of the prom device tree. */
19int prom_root_node;
20
21/* Pointer to the device tree operations structure. */
22struct 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
29extern void prom_meminit(void);
30extern void prom_ranges_init(void);
31
32void __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}
89