aboutsummaryrefslogtreecommitdiffstats
path: root/sound/oss/vidc.c
blob: 8932d89408efb294d2673d7da8f25625cd154046 (plain)
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
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
/*
 *  linux/drivers/sound/vidc.c
 *
 *  Copyright (C) 1997-2000 by Russell King <rmk@arm.linux.org.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  VIDC20 audio driver.
 *
 * The VIDC20 sound hardware consists of the VIDC20 itself, a DAC and a DMA
 * engine.  The DMA transfers fixed-format (16-bit little-endian linear)
 * samples to the VIDC20, which then transfers this data serially to the
 * DACs.  The samplerate is controlled by the VIDC.
 *
 * We currently support a mixer device, but it is currently non-functional.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>

#include <asm/hardware.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/hardware/iomd.h>
#include <asm/irq.h>
#include <asm/system.h>

#include "sound_config.h"
#include "vidc.h"

#ifndef _SIOC_TYPE
#define _SIOC_TYPE(x)	_IOC_TYPE(x)
#endif
#ifndef _SIOC_NR
#define _SIOC_NR(x)	_IOC_NR(x)
#endif

#define VIDC_SOUND_CLOCK	(250000)
#define VIDC_SOUND_CLOCK_EXT	(176400)

/*
 * When using SERIAL SOUND mode (external DAC), the number of physical
 * channels is fixed at 2.
 */
static int		vidc_busy;
static int		vidc_adev;
static int		vidc_audio_rate;
static char		vidc_audio_format;
static char		vidc_audio_channels;

static unsigned char	vidc_level_l[SOUND_MIXER_NRDEVICES] = {
	85,		/* master	*/
	50,		/* bass		*/
	50,		/* treble	*/
	0,		/* synth	*/
	75,		/* pcm		*/
	0,		/* speaker	*/
	100,		/* ext line	*/
	0,		/* mic		*/
	100,		/* CD		*/
	0,
};

static unsigned char	vidc_level_r[SOUND_MIXER_NRDEVICES] = {
	85,		/* master	*/
	50,		/* bass		*/
	50,		/* treble	*/
	0,		/* synth	*/
	75,		/* pcm		*/
	0,		/* speaker	*/
	100,		/* ext line	*/
	0,		/* mic		*/
	100,		/* CD		*/
	0,
};

static unsigned int	vidc_audio_volume_l;	/* left PCM vol, 0 - 65536 */
static unsigned int	vidc_audio_volume_r;	/* right PCM vol, 0 - 65536 */

extern void	vidc_update_filler(int bits, int channels);
extern int	softoss_dev;

static void
vidc_mixer_set(int mdev, unsigned int level)
{
	unsigned int lev_l = level & 0x007f;
	unsigned int lev_r = (level & 0x7f00) >> 8;
	unsigned int mlev_l, mlev_r;

	if (lev_l > 100)
		lev_l = 100;
	if (lev_r > 100)
		lev_r = 100;

#define SCALE(lev,master)	((lev) * (master) * 65536 / 10000)

	mlev_l = vidc_level_l[SOUND_MIXER_VOLUME];
	mlev_r = vidc_level_r[SOUND_MIXER_VOLUME];

	switch (mdev) {
	case SOUND_MIXER_VOLUME:
	case SOUND_MIXER_PCM:
		vidc_level_l[mdev] = lev_l;
		vidc_level_r[mdev] = lev_r;

		vidc_audio_volume_l = SCALE(lev_l, mlev_l);
		vidc_audio_volume_r = SCALE(lev_r, mlev_r);
/*printk("VIDC: PCM vol %05X %05X\n", vidc_audio_volume_l, vidc_audio_volume_r);*/
		break;
	}
#undef SCALE
}

static int vidc_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
{
	unsigned int val;
	unsigned int mdev;

	if (_SIOC_TYPE(cmd) != 'M')
		return -EINVAL;

	mdev = _SIOC_NR(cmd);

	if (_SIOC_DIR(cmd) & _SIOC_WRITE) {
		if (get_user(val, (unsigned int __user *)arg))
			return -EFAULT;

		if (mdev < SOUND_MIXER_NRDEVICES)
			vidc_mixer_set(mdev, val);
		else
			return -EINVAL;
	}

	/*
	 * Return parameters
	 */
	switch (mdev) {
	case SOUND_MIXER_RECSRC:
		val = 0;
		break;

	case SOUND_MIXER_DEVMASK:
		val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
		break;

	case SOUND_MIXER_STEREODEVS:
		val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
		break;

	case SOUND_MIXER_RECMASK:
		val = 0;
		break;

	case SOUND_MIXER_CAPS:
		val = 0;
		break;

	default:
		if (mdev < SOUND_MIXER_NRDEVICES)
			val = vidc_level_l[mdev] | vidc_level_r[mdev] << 8;
		else
			return -EINVAL;
	}

	return put_user(val, (unsigned int __user *)arg) ? -EFAULT : 0;
}

static unsigned int vidc_audio_set_format(int dev, unsigned int fmt)
{
	switch (fmt) {
	default:
		fmt = AFMT_S16_LE;
	case AFMT_U8:
	case AFMT_S8:
	case AFMT_S16_LE:
		vidc_audio_format = fmt;
		vidc_update_filler(vidc_audio_format, vidc_audio_channels);
	case AFMT_QUERY:
		break;
	}
	return vidc_audio_format;
}

#define my_abs(i) ((i)<0 ? -(i) : (i))

static int vidc_audio_set_speed(int dev, int rate)
{
	if (rate) {
		unsigned int hwctrl, hwrate, hwrate_ext, rate_int, rate_ext;
		unsigned int diff_int, diff_ext;
		unsigned int newsize, new2size;

		hwctrl = 0x00000003;

		/* Using internal clock */
		hwrate = (((VIDC_SOUND_CLOCK * 2) / rate) + 1) >> 1;
		if (hwrate < 3)
			hwrate = 3;
		if (hwrate > 255)
			hwrate = 255;

		/* Using exernal clock */
		hwrate_ext = (((VIDC_SOUND_CLOCK_EXT * 2) / rate) + 1) >> 1;
		if (hwrate_ext < 3)
			hwrate_ext = 3;
		if (hwrate_ext > 255)
			hwrate_ext = 255;

		rate_int = VIDC_SOUND_CLOCK / hwrate;
		rate_ext = VIDC_SOUND_CLOCK_EXT / hwrate_ext;

		/* Chose between external and internal clock */
		diff_int = my_abs(rate_ext-rate);
		diff_ext = my_abs(rate_int-rate);
		if (diff_ext < diff_int) {
			/*printk("VIDC: external %d %d %d\n", rate, rate_ext, hwrate_ext);*/
			hwrate=hwrate_ext;
			hwctrl=0x00000002;
			/* Allow roughly 0.4% tolerance */
			if (diff_ext > (rate/256))
				rate=rate_ext;
		} else {
			/*printk("VIDC: internal %d %d %d\n", rate, rate_int, hwrate);*/
			hwctrl=0x00000003;
			/* Allow rougly 0.4% tolerance */
			if (diff_int > (rate/256))
				rate=rate_int;
		}

		vidc_writel(0xb0000000 | (hwrate - 2));
		vidc_writel(0xb1000000 | hwctrl);

		newsize = (10000 / hwrate) & ~3;
		if (newsize < 208)
			newsize = 208;
		if (newsize > 4096)
			newsize = 4096;
		for (new2size = 128; new2size < newsize; new2size <<= 1);
		if (new2size - newsize > newsize - (new2size >> 1))
			new2size >>= 1;
		if (new2size > 4096) {
			printk(KERN_ERR "VIDC: error: dma buffer (%d) %d > 4K\n",
				newsize, new2size);
			new2size = 4096;
		}
		/*printk("VIDC: dma size %d\n", new2size);*/
		dma_bufsize = new2size;
		vidc_audio_rate = rate;
	}
	return vidc_audio_rate;
}

static short vidc_audio_set_channels(int dev, short channels)
{
	switch (channels) {
	default:
		channels = 2;
	case 1:
	case 2:
		vidc_audio_channels = channels;
		vidc_update_filler(vidc_audio_format, vidc_audio_channels);
	case 0:
		break;
	}
	return vidc_audio_channels;
}

/*
 * Open the device
 */
static int vidc_audio_open(int dev, int mode)
{
	/* This audio device does not have recording capability */
	if (mode == OPEN_READ)
		return -EPERM;

	if (vidc_busy)
		return -EBUSY;

	vidc_busy = 1;
	return 0;
}

/*
 * Close the device
 */
static void vidc_audio_close(int dev)
{
	vidc_busy = 0;
}

/*
 * Output a block via DMA to sound device.
 *
 * We just set the DMA start and count; the DMA interrupt routine
 * will take care of formatting the samples (via the appropriate
 * vidc_filler routine), and flag via vidc_audio_dma_interrupt when
 * more data is required.
 */
static void
vidc_audio_output_block(int dev, unsigned long buf, int total_count, int one)
{
	struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
	unsigned long flags;

	local_irq_save(flags);
	dma_start = buf - (unsigned long)dmap->raw_buf_phys + (unsigned long)dmap->raw_buf;
	dma_count = total_count;
	local_irq_restore(flags);
}

static void
vidc_audio_start_input(int dev, unsigned long buf, int count, int intrflag)
{
}

static int vidc_audio_prepare_for_input(int dev, int bsize, int bcount)
{
	return -EINVAL;
}

static irqreturn_t vidc_audio_dma_interrupt(void)
{
	DMAbuf_outputintr(vidc_adev, 1);
	return IRQ_HANDLED;
}

/*
 * Prepare for outputting samples.
 *
 * Each buffer that will be passed will be `bsize' bytes long,
 * with a total of `bcount' buffers.
 */
static int vidc_audio_prepare_for_output(int dev, int bsize, int bcount)
{
	struct audio_operations *adev = audio_devs[dev];

	dma_interrupt = NULL;
	adev->dmap_out->flags |= DMA_NODMA;

	return 0;
}

/*
 * Stop our current operation.
 */
static void vidc_audio_reset(int dev)
{
	dma_interrupt = NULL;
}

static int vidc_audio_local_qlen(int dev)
{
	return /*dma_count !=*/ 0;
}

static void vidc_audio_trigger(int dev, int enable_bits)
{
	struct audio_operations *adev = audio_devs[dev];

	if (enable_bits & PCM_ENABLE_OUTPUT) {
		if (!(adev->flags & DMA_ACTIVE)) {
			unsigned long flags;

			local_irq_save(flags);

			/* prevent recusion */
			adev->flags |= DMA_ACTIVE;

			dma_interrupt = vidc_audio_dma_interrupt;
			vidc_sound_dma_irq(0, NULL, NULL);
			iomd_writeb(DMA_CR_E | 0x10, IOMD_SD0CR);

			local_irq_restore(flags);
		}
	}
}

static struct audio_driver vidc_audio_driver =
{
	.owner			= THIS_MODULE,
	.open			= vidc_audio_open,
	.close			= vidc_audio_close,
	.output_block		= vidc_audio_output_block,
	.start_input		= vidc_audio_start_input,
	.prepare_for_input	= vidc_audio_prepare_for_input,
	.prepare_for_output	= vidc_audio_prepare_for_output,
	.halt_io		= vidc_audio_reset,
	.local_qlen		= vidc_audio_local_qlen,
	.trigger		= vidc_audio_trigger,
	.set_speed		= vidc_audio_set_speed,
	.set_bits		= vidc_audio_set_format,
	.set_channels		= vidc_audio_set_channels
};

static struct mixer_operations vidc_mixer_operations = {
	.owner		= THIS_MODULE,
	.id		= "VIDC",
	.name		= "VIDCsound",
	.ioctl		= vidc_mixer_ioctl
};

void vidc_update_filler(int format, int channels)
{
#define TYPE(fmt,ch) (((fmt)<<2) | ((ch)&3))

	switch (TYPE(format, channels)) {
	default:
	case TYPE(AFMT_U8, 1):
		vidc_filler = vidc_fill_1x8_u;
		break;

	case TYPE(AFMT_U8, 2):
		vidc_filler = vidc_fill_2x8_u;
		break;

	case TYPE(AFMT_S8, 1):
		vidc_filler = vidc_fill_1x8_s;
		break;

	case TYPE(AFMT_S8, 2):
		vidc_filler = vidc_fill_2x8_s;
		break;

	case TYPE(AFMT_S16_LE, 1):
		vidc_filler = vidc_fill_1x16_s;
		break;

	case TYPE(AFMT_S16_LE, 2):
		vidc_filler = vidc_fill_2x16_s;
		break;
	}
}

static void __init attach_vidc(struct address_info *hw_config)
{
	char name[32];
	int i, adev;

	sprintf(name, "VIDC %d-bit sound", hw_config->card_subtype);
	conf_printf(name, hw_config);
	memset(dma_buf, 0, sizeof(dma_buf));

	adev = sound_install_audiodrv(AUDIO_DRIVER_VERSION, name,
			&vidc_audio_driver, sizeof(vidc_audio_driver),
			DMA_AUTOMODE, AFMT_U8 | AFMT_S8 | AFMT_S16_LE,
			NULL, hw_config->dma, hw_config->dma2);

	if (adev < 0)
		goto audio_failed;

	/*
	 * 1024 bytes => 64 buffers
	 */
	audio_devs[adev]->min_fragment = 10;
	audio_devs[adev]->mixer_dev = num_mixers;

	audio_devs[adev]->mixer_dev =
		sound_install_mixer(MIXER_DRIVER_VERSION,
				name, &vidc_mixer_operations,
				sizeof(vidc_mixer_operations), NULL);

	if (audio_devs[adev]->mixer_dev < 0)
		goto mixer_failed;

	for (i = 0; i < 2; i++) {
		dma_buf[i] = get_zeroed_page(GFP_KERNEL);
		if (!dma_buf[i]) {
			printk(KERN_ERR "%s: can't allocate required buffers\n",
				name);
			goto mem_failed;
		}
		dma_pbuf[i] = virt_to_phys((void *)dma_buf[i]);
	}

	if (sound_alloc_dma(hw_config->dma, hw_config->name)) {
		printk(KERN_ERR "%s: DMA %d is in  use\n", name, hw_config->dma);
		goto dma_failed;
	}

	if (request_irq(hw_config->irq, vidc_sound_dma_irq, 0,
			hw_config->name, &dma_start)) {
		printk(KERN_ERR "%s: IRQ %d is in use\n", name, hw_config->irq);
		goto irq_failed;
	}
	vidc_adev = adev;
	vidc_mixer_set(SOUND_MIXER_VOLUME, (85 | 85 << 8));

#if defined(CONFIG_SOUND_SOFTOSS) || defined(CONFIG_SOUND_SOFTOSS_MODULE)
	softoss_dev = adev;
#endif
	return;

irq_failed:
	sound_free_dma(hw_config->dma);
dma_failed:
mem_failed:
	for (i = 0; i < 2; i++)
		free_page(dma_buf[i]);
	sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
mixer_failed:
	sound_unload_audiodev(adev);
audio_failed:
	return;
}

static int __init probe_vidc(struct address_info *hw_config)
{
	hw_config->irq		= IRQ_DMAS0;
	hw_config->dma		= DMA_VIRTUAL_SOUND;
	hw_config->dma2		= -1;
	hw_config->card_subtype	= 16;
	hw_config->name		= "VIDC20";
	return 1;
}

static void __exit unload_vidc(struct address_info *hw_config)
{
	int i, adev = vidc_adev;

	vidc_adev = -1;

	free_irq(hw_config->irq, &dma_start);
	sound_free_dma(hw_config->dma);

	if (adev >= 0) {
		sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
		sound_unload_audiodev(adev);
		for (i = 0; i < 2; i++)
			free_page(dma_buf[i]);
	}
}

static struct address_info cfg;

static int __init init_vidc(void)
{
	if (probe_vidc(&cfg) == 0)
		return -ENODEV;

	attach_vidc(&cfg);

	return 0;
}

static void __exit cleanup_vidc(void)
{
	unload_vidc(&cfg);
}

module_init(init_vidc);
module_exit(cleanup_vidc);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("VIDC20 audio driver");
MODULE_LICENSE("GPL");