1/* $Id: misc.c,v 1.1.1.1 2007/08/03 18:52:18 Exp $
2 * misc.c:  Miscellaneous prom functions that don't belong
3 *          anywhere else.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <asm/openprom.h>
12#include <asm/oplib.h>
13#include <asm/auxio.h>
14#include <asm/system.h>
15
16extern void restore_current(void);
17
18DEFINE_SPINLOCK(prom_lock);
19
20/* Reset and reboot the machine with the command 'bcommand'. */
21void
22prom_reboot(char *bcommand)
23{
24	unsigned long flags;
25	spin_lock_irqsave(&prom_lock, flags);
26	(*(romvec->pv_reboot))(bcommand);
27	/* Never get here. */
28	restore_current();
29	spin_unlock_irqrestore(&prom_lock, flags);
30}
31
32/* Forth evaluate the expression contained in 'fstring'. */
33void
34prom_feval(char *fstring)
35{
36	unsigned long flags;
37	if(!fstring || fstring[0] == 0)
38		return;
39	spin_lock_irqsave(&prom_lock, flags);
40	if(prom_vers == PROM_V0)
41		(*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
42	else
43		(*(romvec->pv_fortheval.v2_eval))(fstring);
44	restore_current();
45	spin_unlock_irqrestore(&prom_lock, flags);
46}
47
48/* We want to do this more nicely some day. */
49extern void (*prom_palette)(int);
50
51/* Drop into the prom, with the chance to continue with the 'go'
52 * prom command.
53 */
54void
55prom_cmdline(void)
56{
57	extern void install_obp_ticker(void);
58	extern void install_linux_ticker(void);
59	unsigned long flags;
60
61	if(!serial_console && prom_palette)
62		prom_palette (1);
63	spin_lock_irqsave(&prom_lock, flags);
64	install_obp_ticker();
65	(*(romvec->pv_abort))();
66	restore_current();
67	install_linux_ticker();
68	spin_unlock_irqrestore(&prom_lock, flags);
69#ifdef CONFIG_SUN_AUXIO
70	set_auxio(AUXIO_LED, 0);
71#endif
72	if(!serial_console && prom_palette)
73		prom_palette (0);
74}
75
76/* Drop into the prom, but completely terminate the program.
77 * No chance of continuing.
78 */
79void
80prom_halt(void)
81{
82	unsigned long flags;
83again:
84	spin_lock_irqsave(&prom_lock, flags);
85	(*(romvec->pv_halt))();
86	/* Never get here. */
87	restore_current();
88	spin_unlock_irqrestore(&prom_lock, flags);
89	goto again; /* PROM is out to get me -DaveM */
90}
91
92typedef void (*sfunc_t)(void);
93
94/* Set prom sync handler to call function 'funcp'. */
95void
96prom_setsync(sfunc_t funcp)
97{
98	if(!funcp) return;
99	*romvec->pv_synchook = funcp;
100}
101
102/* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
103 * format type.  'num_bytes' is the number of bytes that your idbuf
104 * has space for.  Returns 0xff on error.
105 */
106unsigned char
107prom_get_idprom(char *idbuf, int num_bytes)
108{
109	int len;
110
111	len = prom_getproplen(prom_root_node, "idprom");
112	if((len>num_bytes) || (len==-1)) return 0xff;
113	if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
114		return idbuf[0];
115
116	return 0xff;
117}
118
119/* Get the major prom version number. */
120int
121prom_version(void)
122{
123	return romvec->pv_romvers;
124}
125
126/* Get the prom plugin-revision. */
127int
128prom_getrev(void)
129{
130	return prom_rev;
131}
132
133/* Get the prom firmware print revision. */
134int
135prom_getprev(void)
136{
137	return prom_prev;
138}
139