m68k/atari: Initial ARAnyM support
[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / m68k / emu / natfeat.c
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/types.h>
13 #include <linux/console.h>
14 #include <linux/string.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/io.h>
18 #include <asm/machdep.h>
19 #include <asm/natfeat.h>
20
21 asm("\n"
22 "       .global nf_get_id,nf_call\n"
23 "nf_get_id:\n"
24 "       .short  0x7300\n"
25 "       rts\n"
26 "nf_call:\n"
27 "       .short  0x7301\n"
28 "       rts\n"
29 "1:     moveq.l #0,%d0\n"
30 "       rts\n"
31 "       .section __ex_table,\"a\"\n"
32 "       .long   nf_get_id,1b\n"
33 "       .long   nf_call,1b\n"
34 "       .previous");
35 EXPORT_SYMBOL_GPL(nf_get_id);
36 EXPORT_SYMBOL_GPL(nf_call);
37
38 static int stderr_id;
39
40 static void nf_write(struct console *co, const char *str, unsigned int count)
41 {
42         char buf[68];
43
44         buf[64] = 0;
45         while (count > 64) {
46                 memcpy(buf, str, 64);
47                 nf_call(stderr_id, buf);
48                 str += 64;
49                 count -= 64;
50         }
51         memcpy(buf, str, count);
52         buf[count] = 0;
53         nf_call(stderr_id, buf);
54 }
55
56 void nfprint(const char *fmt, ...)
57 {
58         static char buf[256];
59         va_list ap;
60         int n;
61
62         va_start(ap, fmt);
63         n = vsnprintf(buf, 256, fmt, ap);
64         nf_call(nf_get_id("NF_STDERR"), buf);
65         va_end(ap);
66 }
67
68 static struct console nf_console_driver = {
69         .name   = "debug",
70         .write  = nf_write,
71         .flags  = CON_PRINTBUFFER,
72         .index  = -1,
73 };
74
75 static int __init nf_debug_setup(char *arg)
76 {
77         if (strcmp(arg, "emu"))
78                 return 0;
79
80         stderr_id = nf_get_id("NF_STDERR");
81         if (stderr_id)
82                 register_console(&nf_console_driver);
83         return 0;
84 }
85
86 early_param("debug", nf_debug_setup);
87
88 static void nf_poweroff(void)
89 {
90         long id = nf_get_id("NF_SHUTDOWN");
91
92         if (id)
93                 nf_call(id);
94 }
95
96 void nf_init(void)
97 {
98         unsigned long id, version;
99         char buf[256];
100
101         id = nf_get_id("NF_VERSION");
102         if (!id)
103                 return;
104         version = nf_call(id);
105
106         id = nf_get_id("NF_NAME");
107         if (!id)
108                 return;
109         nf_call(id, buf, 256);
110         buf[255] = 0;
111
112         pr_info("NatFeats found (%s, %lu.%lu)\n", buf, version >> 16,
113                 version & 0xffff);
114
115         mach_power_off = nf_poweroff;
116 }