1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * misc.c: Miscellaneous prom functions that don't belong
4*4882a593Smuzhiyun * anywhere else.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/types.h>
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/sched.h>
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <asm/openprom.h>
15*4882a593Smuzhiyun #include <asm/oplib.h>
16*4882a593Smuzhiyun #include <asm/auxio.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun extern void restore_current(void);
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun DEFINE_SPINLOCK(prom_lock);
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* Reset and reboot the machine with the command 'bcommand'. */
23*4882a593Smuzhiyun void
prom_reboot(char * bcommand)24*4882a593Smuzhiyun prom_reboot(char *bcommand)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun unsigned long flags;
27*4882a593Smuzhiyun spin_lock_irqsave(&prom_lock, flags);
28*4882a593Smuzhiyun (*(romvec->pv_reboot))(bcommand);
29*4882a593Smuzhiyun /* Never get here. */
30*4882a593Smuzhiyun restore_current();
31*4882a593Smuzhiyun spin_unlock_irqrestore(&prom_lock, flags);
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /* Forth evaluate the expression contained in 'fstring'. */
35*4882a593Smuzhiyun void
prom_feval(char * fstring)36*4882a593Smuzhiyun prom_feval(char *fstring)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun unsigned long flags;
39*4882a593Smuzhiyun if(!fstring || fstring[0] == 0)
40*4882a593Smuzhiyun return;
41*4882a593Smuzhiyun spin_lock_irqsave(&prom_lock, flags);
42*4882a593Smuzhiyun if(prom_vers == PROM_V0)
43*4882a593Smuzhiyun (*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
44*4882a593Smuzhiyun else
45*4882a593Smuzhiyun (*(romvec->pv_fortheval.v2_eval))(fstring);
46*4882a593Smuzhiyun restore_current();
47*4882a593Smuzhiyun spin_unlock_irqrestore(&prom_lock, flags);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun EXPORT_SYMBOL(prom_feval);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun /* Drop into the prom, with the chance to continue with the 'go'
52*4882a593Smuzhiyun * prom command.
53*4882a593Smuzhiyun */
54*4882a593Smuzhiyun void
prom_cmdline(void)55*4882a593Smuzhiyun prom_cmdline(void)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun unsigned long flags;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun spin_lock_irqsave(&prom_lock, flags);
60*4882a593Smuzhiyun (*(romvec->pv_abort))();
61*4882a593Smuzhiyun restore_current();
62*4882a593Smuzhiyun spin_unlock_irqrestore(&prom_lock, flags);
63*4882a593Smuzhiyun set_auxio(AUXIO_LED, 0);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /* Drop into the prom, but completely terminate the program.
67*4882a593Smuzhiyun * No chance of continuing.
68*4882a593Smuzhiyun */
69*4882a593Smuzhiyun void __noreturn
prom_halt(void)70*4882a593Smuzhiyun prom_halt(void)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun unsigned long flags;
73*4882a593Smuzhiyun again:
74*4882a593Smuzhiyun spin_lock_irqsave(&prom_lock, flags);
75*4882a593Smuzhiyun (*(romvec->pv_halt))();
76*4882a593Smuzhiyun /* Never get here. */
77*4882a593Smuzhiyun restore_current();
78*4882a593Smuzhiyun spin_unlock_irqrestore(&prom_lock, flags);
79*4882a593Smuzhiyun goto again; /* PROM is out to get me -DaveM */
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun typedef void (*sfunc_t)(void);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun /* Set prom sync handler to call function 'funcp'. */
85*4882a593Smuzhiyun void
prom_setsync(sfunc_t funcp)86*4882a593Smuzhiyun prom_setsync(sfunc_t funcp)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun if(!funcp) return;
89*4882a593Smuzhiyun *romvec->pv_synchook = funcp;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun /* Get the idprom and stuff it into buffer 'idbuf'. Returns the
93*4882a593Smuzhiyun * format type. 'num_bytes' is the number of bytes that your idbuf
94*4882a593Smuzhiyun * has space for. Returns 0xff on error.
95*4882a593Smuzhiyun */
96*4882a593Smuzhiyun unsigned char
prom_get_idprom(char * idbuf,int num_bytes)97*4882a593Smuzhiyun prom_get_idprom(char *idbuf, int num_bytes)
98*4882a593Smuzhiyun {
99*4882a593Smuzhiyun int len;
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun len = prom_getproplen(prom_root_node, "idprom");
102*4882a593Smuzhiyun if((len>num_bytes) || (len==-1)) return 0xff;
103*4882a593Smuzhiyun if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
104*4882a593Smuzhiyun return idbuf[0];
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun return 0xff;
107*4882a593Smuzhiyun }
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun /* Get the major prom version number. */
110*4882a593Smuzhiyun int
prom_version(void)111*4882a593Smuzhiyun prom_version(void)
112*4882a593Smuzhiyun {
113*4882a593Smuzhiyun return romvec->pv_romvers;
114*4882a593Smuzhiyun }
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun /* Get the prom plugin-revision. */
117*4882a593Smuzhiyun int
prom_getrev(void)118*4882a593Smuzhiyun prom_getrev(void)
119*4882a593Smuzhiyun {
120*4882a593Smuzhiyun return prom_rev;
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun
123*4882a593Smuzhiyun /* Get the prom firmware print revision. */
124*4882a593Smuzhiyun int
prom_getprev(void)125*4882a593Smuzhiyun prom_getprev(void)
126*4882a593Smuzhiyun {
127*4882a593Smuzhiyun return prom_prev;
128*4882a593Smuzhiyun }
129