xref: /openbmc/linux/arch/sparc/prom/init_32.c (revision 275876e2)
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 #include <linux/module.h>
12 
13 #include <asm/openprom.h>
14 #include <asm/oplib.h>
15 
16 struct linux_romvec *romvec;
17 EXPORT_SYMBOL(romvec);
18 
19 enum prom_major_version prom_vers;
20 unsigned int prom_rev, prom_prev;
21 
22 /* The root node of the prom device tree. */
23 phandle prom_root_node;
24 EXPORT_SYMBOL(prom_root_node);
25 
26 /* Pointer to the device tree operations structure. */
27 struct 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.
31  * It gets passed the pointer to the PROM vector.
32  */
33 
34 void __init prom_init(struct linux_romvec *rp)
35 {
36 	romvec = rp;
37 
38 	switch(romvec->pv_romvers) {
39 	case 0:
40 		prom_vers = PROM_V0;
41 		break;
42 	case 2:
43 		prom_vers = PROM_V2;
44 		break;
45 	case 3:
46 		prom_vers = PROM_V3;
47 		break;
48 	default:
49 		prom_printf("PROMLIB: Bad PROM version %d\n",
50 			    romvec->pv_romvers);
51 		prom_halt();
52 		break;
53 	}
54 
55 	prom_rev = romvec->pv_plugin_revision;
56 	prom_prev = romvec->pv_printrev;
57 	prom_nodeops = romvec->pv_nodeops;
58 
59 	prom_root_node = prom_getsibling(0);
60 	if ((prom_root_node == 0) || ((s32)prom_root_node == -1))
61 		prom_halt();
62 
63 	if((((unsigned long) prom_nodeops) == 0) ||
64 	   (((unsigned long) prom_nodeops) == -1))
65 		prom_halt();
66 
67 	prom_meminit();
68 
69 	prom_ranges_init();
70 
71 	printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
72 	       romvec->pv_romvers, prom_rev);
73 
74 	/* Initialization successful. */
75 }
76