1/* $Id: init.c,v 1.1.1.1 2007/08/03 18:52:18 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 * 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
16struct linux_romvec *romvec;
17enum prom_major_version prom_vers;
18unsigned int prom_rev, prom_prev;
19linux_sun4_romvec *sun4_romvec;
20
21/* The root node of the prom device tree. */
22int prom_root_node;
23
24int prom_stdin, prom_stdout;
25
26/* Pointer to the device tree operations structure. */
27struct linux_nodeops *prom_nodeops;
28
29/* You must call prom_init() before you attempt to use any of the
30 * routines in the prom library.  It returns 0 on success, 1 on
31 * failure.  It gets passed the pointer to the PROM vector.
32 */
33
34extern void prom_meminit(void);
35extern void prom_ranges_init(void);
36
37void __init prom_init(struct linux_romvec *rp)
38{
39#ifdef CONFIG_SUN4
40	extern struct linux_romvec *sun4_prom_init(void);
41	rp = sun4_prom_init();
42#endif
43	romvec = rp;
44
45	switch(romvec->pv_romvers) {
46	case 0:
47		prom_vers = PROM_V0;
48		break;
49	case 2:
50		prom_vers = PROM_V2;
51		break;
52	case 3:
53		prom_vers = PROM_V3;
54		break;
55	case 40:
56		prom_vers = PROM_SUN4;
57		break;
58	default:
59		prom_printf("PROMLIB: Bad PROM version %d\n",
60			    romvec->pv_romvers);
61		prom_halt();
62		break;
63	};
64
65	prom_rev = romvec->pv_plugin_revision;
66	prom_prev = romvec->pv_printrev;
67	prom_nodeops = romvec->pv_nodeops;
68
69	prom_root_node = prom_getsibling(0);
70	if((prom_root_node == 0) || (prom_root_node == -1))
71		prom_halt();
72
73	if((((unsigned long) prom_nodeops) == 0) ||
74	   (((unsigned long) prom_nodeops) == -1))
75		prom_halt();
76
77	if(prom_vers == PROM_V2 || prom_vers == PROM_V3) {
78		prom_stdout = *romvec->pv_v2bootargs.fd_stdout;
79		prom_stdin  = *romvec->pv_v2bootargs.fd_stdin;
80	}
81
82	prom_meminit();
83
84	prom_ranges_init();
85
86#ifndef CONFIG_SUN4
87	/* SUN4 prints this in sun4_prom_init */
88	printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
89	       romvec->pv_romvers, prom_rev);
90#endif
91
92	/* Initialization successful. */
93	return;
94}
95