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  */
7 
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 
11 #include <asm/openprom.h>
12 #include <asm/oplib.h>
13 
14 struct linux_romvec *romvec;
15 enum prom_major_version prom_vers;
16 unsigned int prom_rev, prom_prev;
17 
18 /* The root node of the prom device tree. */
19 int prom_root_node;
20 
21 /* Pointer to the device tree operations structure. */
22 struct 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 
29 extern void prom_meminit(void);
30 extern void prom_ranges_init(void);
31 
prom_init(struct linux_romvec * rp)32 void __init prom_init(struct linux_romvec *rp)
33 {
34 	romvec = rp;
35 #ifndef CONFIG_SUN3
36 	switch(romvec->pv_romvers) {
37 	case 0:
38 		prom_vers = PROM_V0;
39 		break;
40 	case 2:
41 		prom_vers = PROM_V2;
42 		break;
43 	case 3:
44 		prom_vers = PROM_V3;
45 		break;
46 	case 4:
47 		prom_vers = PROM_P1275;
48 		prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n");
49 		prom_halt();
50 		break;
51 	default:
52 		prom_printf("PROMLIB: Bad PROM version %d\n",
53 			    romvec->pv_romvers);
54 		prom_halt();
55 		break;
56 	};
57 
58 	prom_rev = romvec->pv_plugin_revision;
59 	prom_prev = romvec->pv_printrev;
60 	prom_nodeops = romvec->pv_nodeops;
61 
62 	prom_root_node = prom_getsibling(0);
63 	if((prom_root_node == 0) || (prom_root_node == -1))
64 		prom_halt();
65 
66 	if((((unsigned long) prom_nodeops) == 0) ||
67 	   (((unsigned long) prom_nodeops) == -1))
68 		prom_halt();
69 
70 	prom_meminit();
71 
72 	prom_ranges_init();
73 #endif
74 //	printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
75 //	       romvec->pv_romvers, prom_rev);
76 
77 	/* Initialization successful. */
78 	return;
79 }
80