summaryrefslogtreecommitdiff
path: root/sound/soc/txx9/txx9aclc.c
blob: 3de99af8cb82ccf6def128632603825e57c9ab77 (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
/*
 * Generic TXx9 ACLC platform driver
 *
 * Copyright (C) 2009 Atsushi Nemoto
 *
 * Based on RBTX49xx patch from CELF patch archive.
 * (C) Copyright TOSHIBA CORPORATION 2004-2006
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "txx9aclc.h"

static struct txx9aclc_soc_device {
	struct txx9aclc_dmadata dmadata[2];
} txx9aclc_soc_device;

/* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;

static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
			     struct txx9aclc_dmadata *dmadata);

static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
	/*
	 * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
	 * needs more works for noncoherent MIPS.
	 */
	.info		  = SNDRV_PCM_INFO_INTERLEAVED |
			    SNDRV_PCM_INFO_BATCH |
			    SNDRV_PCM_INFO_PAUSE,
#ifdef __BIG_ENDIAN
	.formats	  = SNDRV_PCM_FMTBIT_S16_BE,
#else
	.formats	  = SNDRV_PCM_FMTBIT_S16_LE,
#endif
	.period_bytes_min = 1024,
	.period_bytes_max = 8 * 1024,
	.periods_min	  = 2,
	.periods_max	  = 4096,
	.buffer_bytes_max = 32 * 1024,
};

static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct txx9aclc_dmadata *dmadata = runtime->private_data;
	int ret;

	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	if (ret < 0)
		return ret;

	dev_dbg(rtd->platform->dev,
		"runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
		"runtime->min_align %ld\n",
		(unsigned long)runtime->dma_area,
		(unsigned long)runtime->dma_addr, runtime->dma_bytes,
		runtime->min_align);
	dev_dbg(rtd->platform->dev,
		"periods %d period_bytes %d stream %d\n",
		params_periods(params), params_period_bytes(params),
		substream->stream);

	dmadata->substream = substream;
	dmadata->pos = 0;
	return 0;
}

static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct txx9aclc_dmadata *dmadata = runtime->private_data;

	dmadata->dma_addr = runtime->dma_addr;
	dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
	dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);

	if (dmadata->buffer_bytes == dmadata->period_bytes) {
		dmadata->frag_bytes = dmadata->period_bytes >> 1;
		dmadata->frags = 2;
	} else {
		dmadata->frag_bytes = dmadata->period_bytes;
		dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
	}
	dmadata->frag_count = 0;
	dmadata->pos = 0;
	return 0;
}

static void txx9aclc_dma_complete(void *arg)
{
	struct txx9aclc_dmadata *dmadata = arg;
	unsigned long flags;

	/* dma completion handler cannot submit new operations */
	spin_lock_irqsave(&dmadata->dma_lock, flags);
	if (dmadata->frag_count >= 0) {
		dmadata->dmacount--;
		BUG_ON(dmadata->dmacount < 0);
		tasklet_schedule(&dmadata->tasklet);
	}
	spin_unlock_irqrestore(&dmadata->dma_lock, flags);
}

static struct dma_async_tx_descriptor *
txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
{
	struct dma_chan *chan = dmadata->dma_chan;
	struct dma_async_tx_descriptor *desc;
	struct scatterlist sg;

	sg_init_table(&sg, 1);
	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
		    dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
	sg_dma_address(&sg) = buf_dma_addr;
	desc = chan->device->device_prep_slave_sg(chan, &sg, 1,
		dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
		DMA_TO_DEVICE : DMA_FROM_DEVICE,
		DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc) {
		dev_err(&chan->dev->device, "cannot prepare slave dma\n");
		return NULL;
	}
	desc->callback = txx9aclc_dma_complete;
	desc->callback_param = dmadata;
	desc->tx_submit(desc);
	return desc;
}

#define NR_DMA_CHAIN		2

static void txx9aclc_dma_tasklet(unsigned long data)
{
	struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
	struct dma_chan *chan = dmadata->dma_chan;
	struct dma_async_tx_descriptor *desc;
	struct snd_pcm_substream *substream = dmadata->substream;
	u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
		ACCTL_AUDODMA : ACCTL_AUDIDMA;
	int i;
	unsigned long flags;

	spin_lock_irqsave(&dmadata->dma_lock, flags);
	if (dmadata->frag_count < 0) {
		struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
		void __iomem *base = drvdata->base;

		spin_unlock_irqrestore(&dmadata->dma_lock, flags);
		chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
		/* first time */
		for (i = 0; i < NR_DMA_CHAIN; i++) {
			desc = txx9aclc_dma_submit(dmadata,
				dmadata->dma_addr + i * dmadata->frag_bytes);
			if (!desc)
				return;
		}
		dmadata->dmacount = NR_DMA_CHAIN;
		chan->device->device_issue_pending(chan);
		spin_lock_irqsave(&dmadata->dma_lock, flags);
		__raw_writel(ctlbit, base + ACCTLEN);
		dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
		spin_unlock_irqrestore(&dmadata->dma_lock, flags);
		return;
	}
	BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
	while (dmadata->dmacount < NR_DMA_CHAIN) {
		dmadata->dmacount++;
		spin_unlock_irqrestore(&dmadata->dma_lock, flags);
		desc = txx9aclc_dma_submit(dmadata,
			dmadata->dma_addr +
			dmadata->frag_count * dmadata->frag_bytes);
		if (!desc)
			return;
		chan->device->device_issue_pending(chan);

		spin_lock_irqsave(&dmadata->dma_lock, flags);
		dmadata->frag_count++;
		dmadata->frag_count %= dmadata->frags;
		dmadata->pos += dmadata->frag_bytes;
		dmadata->pos %= dmadata->buffer_bytes;
		if ((dmadata->frag_count * dmadata->frag_bytes) %
		    dmadata->period_bytes == 0)
			snd_pcm_period_elapsed(substream);
	}
	spin_unlock_irqrestore(&dmadata->dma_lock, flags);
}

static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
	struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
	void __iomem *base = drvdata->base;
	unsigned long flags;
	int ret = 0;
	u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
		ACCTL_AUDODMA : ACCTL_AUDIDMA;

	spin_lock_irqsave(&dmadata->dma_lock, flags);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		dmadata->frag_count = -1;
		tasklet_schedule(&dmadata->tasklet);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		__raw_writel(ctlbit, base + ACCTLDIS);
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		__raw_writel(ctlbit, base + ACCTLEN);
		break;
	default:
		ret = -EINVAL;
	}
	spin_unlock_irqrestore(&dmadata->dma_lock, flags);
	return ret;
}

static snd_pcm_uframes_t
txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;

	return bytes_to_frames(substream->runtime, dmadata->pos);
}

static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
{
	struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
	struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
	int ret;

	ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
	if (ret)
		return ret;
	/* ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(substream->runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		return ret;
	substream->runtime->private_data = dmadata;
	return 0;
}

static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
{
	struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
	struct dma_chan *chan = dmadata->dma_chan;

	dmadata->frag_count = -1;
	chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
	return 0;
}

static struct snd_pcm_ops txx9aclc_pcm_ops = {
	.open		= txx9aclc_pcm_open,
	.close		= txx9aclc_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= txx9aclc_pcm_hw_params,
	.hw_free	= txx9aclc_pcm_hw_free,
	.prepare	= txx9aclc_pcm_prepare,
	.trigger	= txx9aclc_pcm_trigger,
	.pointer	= txx9aclc_pcm_pointer,
};

static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct snd_pcm *pcm = rtd->pcm;
	struct platform_device *pdev = to_platform_device(dai->platform->dev);
	struct txx9aclc_soc_device *dev;
	struct resource *r;
	int i;
	int ret;

	/* at this point onwards the AC97 component has probed and this will be valid */
	dev = snd_soc_dai_get_drvdata(dai);

	dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
	dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
	for (i = 0; i < 2; i++) {
		r = platform_get_resource(pdev, IORESOURCE_DMA, i);
		if (!r) {
			ret = -EBUSY;
			goto exit;
		}
		dev->dmadata[i].dma_res = r;
		ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
		if (ret)
			goto exit;
	}
	return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
		card->dev, 64 * 1024, 4 * 1024 * 1024);

exit:
	for (i = 0; i < 2; i++) {
		if (dev->dmadata[i].dma_chan)
			dma_release_channel(dev->dmadata[i].dma_chan);
		dev->dmadata[i].dma_chan = NULL;
	}
	return ret;
}

static bool filter(struct dma_chan *chan, void *param)
{
	struct txx9aclc_dmadata *dmadata = param;
	char *devname;
	bool found = false;

	devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
		(int)dmadata->dma_res->start);
	if (strcmp(dev_name(chan->device->dev), devname) == 0) {
		chan->private = &dmadata->dma_slave;
		found = true;
	}
	kfree(devname);
	return found;
}

static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
			     struct txx9aclc_dmadata *dmadata)
{
	struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
	struct txx9dmac_slave *ds = &dmadata->dma_slave;
	dma_cap_mask_t mask;

	spin_lock_init(&dmadata->dma_lock);

	ds->reg_width = sizeof(u32);
	if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		ds->tx_reg = drvdata->physbase + ACAUDODAT;
		ds->rx_reg = 0;
	} else {
		ds->tx_reg = 0;
		ds->rx_reg = drvdata->physbase + ACAUDIDAT;
	}

	/* Try to grab a DMA channel */
	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
	if (!dmadata->dma_chan) {
		printk(KERN_ERR
			"DMA channel for %s is not available\n",
			dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			"playback" : "capture");
		return -EBUSY;
	}
	tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
		     (unsigned long)dmadata);
	return 0;
}

static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
{
	snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
	return 0;
}

static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
{
	struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
	void __iomem *base = drvdata->base;
	int i;

	/* disable all FIFO DMAs */
	__raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
	/* dummy R/W to clear pending DMAREQ if any */
	__raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);

	for (i = 0; i < 2; i++) {
		struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
		struct dma_chan *chan = dmadata->dma_chan;
		if (chan) {
			dmadata->frag_count = -1;
			chan->device->device_control(chan,
						     DMA_TERMINATE_ALL, 0);
			dma_release_channel(chan);
		}
		dev->dmadata[i].dma_chan = NULL;
	}
	return 0;
}

static struct snd_soc_platform_driver txx9aclc_soc_platform = {
	.probe		= txx9aclc_pcm_probe,
	.remove		= txx9aclc_pcm_remove,
	.ops		= &txx9aclc_pcm_ops,
	.pcm_new	= txx9aclc_pcm_new,
	.pcm_free	= txx9aclc_pcm_free_dma_buffers,
};

static int __devinit txx9aclc_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform);
}

static int __devexit txx9aclc_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver txx9aclc_pcm_driver = {
	.driver = {
			.name = "txx9aclc-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = txx9aclc_soc_platform_probe,
	.remove = __devexit_p(txx9aclc_soc_platform_remove),
};

static int __init snd_txx9aclc_pcm_init(void)
{
	return platform_driver_register(&txx9aclc_pcm_driver);
}
module_init(snd_txx9aclc_pcm_init);

static void __exit snd_txx9aclc_pcm_exit(void)
{
	platform_driver_unregister(&txx9aclc_pcm_driver);
}
module_exit(snd_txx9aclc_pcm_exit);

MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
MODULE_LICENSE("GPL");