summaryrefslogtreecommitdiff
path: root/sound/soc/nuc900/nuc900-pcm.c
blob: c894ff0f25809c997197496e810cc52d0299d40a (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
/*
 * Copyright (c) 2010 Nuvoton technology corporation.
 *
 * Wan ZongShun <mcuos.com@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation;version 2 of the License.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <mach/hardware.h>

#include "nuc900-audio.h"

static const struct snd_pcm_hardware nuc900_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_INTERLEAVED |
					SNDRV_PCM_INFO_BLOCK_TRANSFER |
					SNDRV_PCM_INFO_MMAP |
					SNDRV_PCM_INFO_MMAP_VALID |
					SNDRV_PCM_INFO_PAUSE |
					SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.channels_min		= 1,
	.channels_max		= 2,
	.buffer_bytes_max	= 4*1024,
	.period_bytes_min	= 1*1024,
	.period_bytes_max	= 4*1024,
	.periods_min		= 1,
	.periods_max		= 1024,
};

static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;
	unsigned long flags;
	int ret = 0;

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

	spin_lock_irqsave(&nuc900_audio->lock, flags);

	nuc900_audio->substream = substream;
	nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr;
	nuc900_audio->buffersize[substream->stream] =
						params_buffer_bytes(params);

	spin_unlock_irqrestore(&nuc900_audio->lock, flags);

	return ret;
}

static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
				dma_addr_t dma_addr, size_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;
	void __iomem *mmio_addr, *mmio_len;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
		mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
	} else {
		mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
		mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
	}

	AUDIO_WRITE(mmio_addr, dma_addr);
	AUDIO_WRITE(mmio_len, count);
}

static void nuc900_dma_start(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;
	unsigned long val;

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
	val |= (T_DMA_IRQ | R_DMA_IRQ);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
}

static void nuc900_dma_stop(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;
	unsigned long val;

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
	val &= ~(T_DMA_IRQ | R_DMA_IRQ);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
}

static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
{
	struct snd_pcm_substream *substream = dev_id;
	struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
	unsigned long val;

	spin_lock(&nuc900_audio->lock);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);

	if (val & R_DMA_IRQ) {
		AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);

		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);

		if (val & R_DMA_MIDDLE_IRQ) {
			val |= R_DMA_MIDDLE_IRQ;
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
		}

		if (val & R_DMA_END_IRQ) {
			val |= R_DMA_END_IRQ;
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
		}
	} else if (val & T_DMA_IRQ) {
		AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);

		val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);

		if (val & P_DMA_MIDDLE_IRQ) {
			val |= P_DMA_MIDDLE_IRQ;
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
		}

		if (val & P_DMA_END_IRQ) {
			val |= P_DMA_END_IRQ;
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
		}
	} else {
		dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
		spin_unlock(&nuc900_audio->lock);
		return IRQ_HANDLED;
	}

	spin_unlock(&nuc900_audio->lock);

	snd_pcm_period_elapsed(substream);

	return IRQ_HANDLED;
}

static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;
	unsigned long flags, val;
	int ret = 0;

	spin_lock_irqsave(&nuc900_audio->lock, flags);

	nuc900_update_dma_register(substream,
				nuc900_audio->dma_addr[substream->stream],
				nuc900_audio->buffersize[substream->stream]);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);

	switch (runtime->channels) {
	case 1:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
			val |= PLAY_RIGHT_CHNNEL;
		} else {
			val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
			val |= RECORD_RIGHT_CHNNEL;
		}
		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
		break;
	case 2:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
		else
			val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
		break;
	default:
		ret = -EINVAL;
	}
	spin_unlock_irqrestore(&nuc900_audio->lock, flags);
	return ret;
}

static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
{
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		nuc900_dma_start(substream);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		nuc900_dma_stop(substream);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
					dma_addr_t *src, dma_addr_t *dst)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;

	if (src != NULL)
		*src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);

	if (dst != NULL)
		*dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);

	return 0;
}

static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	dma_addr_t src, dst;
	unsigned long res;

	nuc900_dma_getposition(substream, &src, &dst);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		res = dst - runtime->dma_addr;
	else
		res = src - runtime->dma_addr;

	return bytes_to_frames(substream->runtime, res);
}

static int nuc900_dma_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio;

	snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);

	nuc900_audio = nuc900_ac97_data;

	if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
			0, "nuc900-dma", substream))
		return -EBUSY;

	runtime->private_data = nuc900_audio;

	return 0;
}

static int nuc900_dma_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct nuc900_audio *nuc900_audio = runtime->private_data;

	free_irq(nuc900_audio->irq_num, substream);

	return 0;
}

static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
					runtime->dma_area,
					runtime->dma_addr,
					runtime->dma_bytes);
}

static struct snd_pcm_ops nuc900_dma_ops = {
	.open		= nuc900_dma_open,
	.close		= nuc900_dma_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= nuc900_dma_hw_params,
	.hw_free	= nuc900_dma_hw_free,
	.prepare	= nuc900_dma_prepare,
	.trigger	= nuc900_dma_trigger,
	.pointer	= nuc900_dma_pointer,
	.mmap		= nuc900_dma_mmap,
};

static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &nuc900_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
		card->dev, 4 * 1024, (4 * 1024) - 1);

	return 0;
}

static struct snd_soc_platform_driver nuc900_soc_platform = {
	.ops		= &nuc900_dma_ops,
	.pcm_new	= nuc900_dma_new,
	.pcm_free	= nuc900_dma_free_dma_buffers,
};

static int nuc900_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
}

static int nuc900_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver nuc900_pcm_driver = {
	.driver = {
			.name = "nuc900-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = nuc900_soc_platform_probe,
	.remove = nuc900_soc_platform_remove,
};

module_platform_driver(nuc900_pcm_driver);

MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("nuc900 Audio DMA module");
MODULE_LICENSE("GPL");