1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
/*
* sound/sb16_midi.c
*
* The low level driver for the MPU-401 UART emulation of the SB16.
*
* Copyright by Hannu Savolainen 1993
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* sb16_midi.c,v 1.4 1994/10/01 02:17:03 swallace Exp
*/
#include "sound_config.h"
#ifdef CONFIGURE_SOUNDCARD
#if !defined(EXCLUDE_SB) && !defined(EXCLUDE_SB16) && !defined(EXCLUDE_MIDI)
#include "sb.h"
#define DATAPORT (sb16midi_base)
#define COMDPORT (sb16midi_base+1)
#define STATPORT (sb16midi_base+1)
#define sb16midi_status() INB(STATPORT)
#define input_avail() (!(sb16midi_status()&INPUT_AVAIL))
#define output_ready() (!(sb16midi_status()&OUTPUT_READY))
#define sb16midi_cmd(cmd) OUTB(cmd, COMDPORT)
#define sb16midi_read() INB(DATAPORT)
#define sb16midi_write(byte) OUTB(byte, DATAPORT)
#define OUTPUT_READY 0x40
#define INPUT_AVAIL 0x80
#define MPU_ACK 0xFE
#define MPU_RESET 0xFF
#define UART_MODE_ON 0x3F
static int sb16midi_opened = 0;
static int sb16midi_base = 0x330;
static int sb16midi_detected = 0;
static int my_dev;
extern int sbc_base;
static int reset_sb16midi (void);
static void (*midi_input_intr) (int dev, unsigned char data);
static void
sb16midi_input_loop (void)
{
while (input_avail ())
{
unsigned char c = sb16midi_read ();
if (sb16midi_opened & OPEN_READ)
midi_input_intr (my_dev, c);
}
}
void
sb16midiintr (int unit)
{
if (input_avail ())
sb16midi_input_loop ();
}
static int
sb16midi_open (int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
if (sb16midi_opened)
{
return RET_ERROR (EBUSY);
}
sb16midi_input_loop ();
midi_input_intr = input;
sb16midi_opened = mode;
return 0;
}
static void
sb16midi_close (int dev)
{
sb16midi_opened = 0;
}
static int
sb16midi_out (int dev, unsigned char midi_byte)
{
int timeout;
unsigned long flags;
/*
* Test for input since pending input seems to block the output.
*/
DISABLE_INTR (flags);
if (input_avail ())
sb16midi_input_loop ();
RESTORE_INTR (flags);
/*
* Sometimes it takes about 13000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
for (timeout = 30000; timeout > 0 && !output_ready (); timeout--); /*
* Wait
*/
if (!output_ready ())
{
printk ("MPU-401: Timeout\n");
return 0;
}
sb16midi_write (midi_byte);
return 1;
}
static int
sb16midi_start_read (int dev)
{
return 0;
}
static int
sb16midi_end_read (int dev)
{
return 0;
}
static int
sb16midi_ioctl (int dev, unsigned cmd, unsigned arg)
{
return RET_ERROR (EINVAL);
}
static void
sb16midi_kick (int dev)
{
}
static int
sb16midi_buffer_status (int dev)
{
return 0; /*
* No data in buffers
*/
}
#define MIDI_SYNTH_NAME "SoundBlaster 16 Midi"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include "midi_synth.h"
static struct midi_operations sb16midi_operations =
{
{"SoundBlaster 16 Midi", 0, 0, SNDCARD_SB16MIDI},
&std_midi_synth,
sb16midi_open,
sb16midi_close,
sb16midi_ioctl,
sb16midi_out,
sb16midi_start_read,
sb16midi_end_read,
sb16midi_kick,
NULL,
sb16midi_buffer_status,
NULL
};
long
attach_sb16midi (long mem_start, struct address_info *hw_config)
{
int ok, timeout;
unsigned long flags;
sb16midi_base = hw_config->io_base;
if (!sb16midi_detected)
return RET_ERROR (EIO);
DISABLE_INTR (flags);
for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /*
* Wait
*/
sb16midi_cmd (UART_MODE_ON);
ok = 0;
for (timeout = 50000; timeout > 0 && !ok; timeout--)
if (input_avail ())
if (sb16midi_read () == MPU_ACK)
ok = 1;
RESTORE_INTR (flags);
if (num_midis >= MAX_MIDI_DEV)
{
printk ("Sound: Too many midi devices detected\n");
return mem_start;
}
#ifdef __FreeBSD__
printk ("snd7: <SoundBlaster MPU-401>");
#else
printk (" <SoundBlaster MPU-401>");
#endif
std_midi_synth.midi_dev = my_dev = num_midis;
midi_devs[num_midis++] = &sb16midi_operations;
return mem_start;
}
static int
reset_sb16midi (void)
{
unsigned long flags;
int ok, timeout, n;
/*
* Send the RESET command. Try again if no success at the first time.
*/
ok = 0;
DISABLE_INTR (flags);
for (n = 0; n < 2 && !ok; n++)
{
for (timeout = 30000; timeout < 0 && !output_ready (); timeout--); /*
* Wait
*/
sb16midi_cmd (MPU_RESET); /*
* Send MPU-401 RESET Command
*/
/*
* Wait at least 25 msec. This method is not accurate so let's make the
* loop bit longer. Cannot sleep since this is called during boot.
*/
for (timeout = 50000; timeout > 0 && !ok; timeout--)
if (input_avail ())
if (sb16midi_read () == MPU_ACK)
ok = 1;
}
sb16midi_opened = 0;
if (ok)
sb16midi_input_loop (); /*
* Flush input before enabling interrupts
*/
RESTORE_INTR (flags);
return ok;
}
int
probe_sb16midi (struct address_info *hw_config)
{
int ok = 0;
extern int sbc_major;
if (sbc_major < 4)
return 0; /* Not a SB16 */
sb16midi_base = hw_config->io_base;
if (sb_get_irq () < 0)
return 0;
ok = reset_sb16midi ();
sb16midi_detected = ok;
return ok;
}
#endif
#endif
|