1 /*
2  * natfeat.c - ARAnyM hardware support via Native Features (natfeats)
3  *
4  * Copyright (c) 2005 Petr Stehlik of ARAnyM dev team
5  *
6  * Reworked for Linux by Roman Zippel <zippel@linux-m68k.org>
7  *
8  * This software may be used and distributed according to the terms of
9  * the GNU General Public License (GPL), incorporated herein by reference.
10  */
11 
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/console.h>
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/reboot.h>
19 #include <linux/io.h>
20 #include <asm/machdep.h>
21 #include <asm/natfeat.h>
22 
23 extern long nf_get_id_phys(unsigned long feature_name);
24 
25 asm("\n"
26 "	.global nf_get_id_phys,nf_call\n"
27 "nf_get_id_phys:\n"
28 "	.short	0x7300\n"
29 "	rts\n"
30 "nf_call:\n"
31 "	.short	0x7301\n"
32 "	rts\n"
33 "1:	moveq.l	#0,%d0\n"
34 "	rts\n"
35 "	.section __ex_table,\"a\"\n"
36 "	.long	nf_get_id_phys,1b\n"
37 "	.long	nf_call,1b\n"
38 "	.previous");
39 EXPORT_SYMBOL_GPL(nf_call);
40 
nf_get_id(const char * feature_name)41 long nf_get_id(const char *feature_name)
42 {
43 	/* feature_name may be in vmalloc()ed memory, so make a copy */
44 	char name_copy[32];
45 	size_t n;
46 
47 	n = strlcpy(name_copy, feature_name, sizeof(name_copy));
48 	if (n >= sizeof(name_copy))
49 		return 0;
50 
51 	return nf_get_id_phys(virt_to_phys(name_copy));
52 }
53 EXPORT_SYMBOL_GPL(nf_get_id);
54 
nfprint(const char * fmt,...)55 void nfprint(const char *fmt, ...)
56 {
57 	static char buf[256];
58 	va_list ap;
59 	int n;
60 
61 	va_start(ap, fmt);
62 	n = vsnprintf(buf, 256, fmt, ap);
63 	nf_call(nf_get_id("NF_STDERR"), virt_to_phys(buf));
64 	va_end(ap);
65 }
66 
nf_poweroff(void)67 static void nf_poweroff(void)
68 {
69 	long id = nf_get_id("NF_SHUTDOWN");
70 
71 	if (id)
72 		nf_call(id);
73 }
74 
nf_init(void)75 void __init nf_init(void)
76 {
77 	unsigned long id, version;
78 	char buf[256];
79 
80 	id = nf_get_id("NF_VERSION");
81 	if (!id)
82 		return;
83 	version = nf_call(id);
84 
85 	id = nf_get_id("NF_NAME");
86 	if (!id)
87 		return;
88 	nf_call(id, virt_to_phys(buf), 256);
89 	buf[255] = 0;
90 
91 	pr_info("NatFeats found (%s, %lu.%lu)\n", buf, version >> 16,
92 		version & 0xffff);
93 
94 	register_platform_power_off(nf_poweroff);
95 }
96