summaryrefslogtreecommitdiff
path: root/sound/soc/bcm/bcm63xx-pcm-whistler.c
blob: 018f2372e892c2d46081ccf6a8c16400504efca7 (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
// SPDX-License-Identifier: GPL-2.0-or-later
// linux/sound/bcm/bcm63xx-pcm-whistler.c
// BCM63xx whistler pcm interface
// Copyright (c) 2020 Broadcom Corporation
// Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>

#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <sound/pcm_params.h>
#include <linux/regmap.h>
#include <linux/of_device.h>
#include <sound/soc.h>
#include "bcm63xx-i2s.h"


struct i2s_dma_desc {
	unsigned char *dma_area;
	dma_addr_t dma_addr;
	unsigned int dma_len;
};

struct bcm63xx_runtime_data {
	int dma_len;
	dma_addr_t dma_addr;
	dma_addr_t dma_addr_next;
};

static const struct snd_pcm_hardware bcm63xx_pcm_hardware = {
	.info = SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_PAUSE |
		SNDRV_PCM_INFO_RESUME,
	.formats = SNDRV_PCM_FMTBIT_S32_LE, /* support S32 only */
	.period_bytes_max = 8192 - 32,
	.periods_min = 1,
	.periods_max = PAGE_SIZE/sizeof(struct i2s_dma_desc),
	.buffer_bytes_max = 128 * 1024,
	.fifo_size = 32,
};

static int bcm63xx_pcm_hw_params(struct snd_soc_component *component,
				 struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params)
{
	struct i2s_dma_desc *dma_desc;
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);

	dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
	if (!dma_desc)
		return -ENOMEM;

	snd_soc_dai_set_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream, dma_desc);

	return 0;
}

static int bcm63xx_pcm_hw_free(struct snd_soc_component *component,
			struct snd_pcm_substream *substream)
{
	struct i2s_dma_desc	*dma_desc;
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);

	dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
	kfree(dma_desc);

	return 0;
}

static int bcm63xx_pcm_trigger(struct snd_soc_component *component,
			       struct snd_pcm_substream *substream, int cmd)
{
	int ret = 0;
	struct snd_soc_pcm_runtime *rtd;
	struct bcm_i2s_priv *i2s_priv;
	struct regmap   *regmap_i2s;

	rtd = snd_soc_substream_to_rtd(substream);
	i2s_priv = dev_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0)->dev);
	regmap_i2s = i2s_priv->regmap_i2s;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
			regmap_update_bits(regmap_i2s,
					   I2S_TX_IRQ_EN,
					   I2S_TX_DESC_OFF_INTR_EN,
					   I2S_TX_DESC_OFF_INTR_EN);
			regmap_update_bits(regmap_i2s,
					   I2S_TX_CFG,
					   I2S_TX_ENABLE_MASK,
					   I2S_TX_ENABLE);
			break;
		case SNDRV_PCM_TRIGGER_STOP:
		case SNDRV_PCM_TRIGGER_SUSPEND:
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
			regmap_write(regmap_i2s,
				     I2S_TX_IRQ_EN,
				     0);
			regmap_update_bits(regmap_i2s,
					   I2S_TX_CFG,
					   I2S_TX_ENABLE_MASK,
					   0);
			break;
		default:
			ret = -EINVAL;
		}
	} else {
		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
			regmap_update_bits(regmap_i2s,
					   I2S_RX_IRQ_EN,
					   I2S_RX_DESC_OFF_INTR_EN_MSK,
					   I2S_RX_DESC_OFF_INTR_EN);
			regmap_update_bits(regmap_i2s,
					   I2S_RX_CFG,
					   I2S_RX_ENABLE_MASK,
					   I2S_RX_ENABLE);
			break;
		case SNDRV_PCM_TRIGGER_STOP:
		case SNDRV_PCM_TRIGGER_SUSPEND:
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
			regmap_update_bits(regmap_i2s,
					   I2S_RX_IRQ_EN,
					   I2S_RX_DESC_OFF_INTR_EN_MSK,
					   0);
			regmap_update_bits(regmap_i2s,
					   I2S_RX_CFG,
					   I2S_RX_ENABLE_MASK,
					   0);
			break;
		default:
			ret = -EINVAL;
		}
	}
	return ret;
}

static int bcm63xx_pcm_prepare(struct snd_soc_component *component,
			struct snd_pcm_substream *substream)
{
	struct i2s_dma_desc	*dma_desc;
	struct regmap		*regmap_i2s;
	struct bcm_i2s_priv	*i2s_priv;
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	uint32_t regaddr_desclen, regaddr_descaddr;

	dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
	dma_desc->dma_len  = snd_pcm_lib_period_bytes(substream);
	dma_desc->dma_addr = runtime->dma_addr;
	dma_desc->dma_area = runtime->dma_area;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		regaddr_desclen = I2S_TX_DESC_IFF_LEN;
		regaddr_descaddr = I2S_TX_DESC_IFF_ADDR;
	} else {
		regaddr_desclen = I2S_RX_DESC_IFF_LEN;
		regaddr_descaddr = I2S_RX_DESC_IFF_ADDR;
	}

	i2s_priv = dev_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0)->dev);
	regmap_i2s = i2s_priv->regmap_i2s;

	regmap_write(regmap_i2s, regaddr_desclen, dma_desc->dma_len);
	regmap_write(regmap_i2s, regaddr_descaddr, dma_desc->dma_addr);

	return 0;
}

static snd_pcm_uframes_t
bcm63xx_pcm_pointer(struct snd_soc_component *component,
		struct snd_pcm_substream *substream)
{
	snd_pcm_uframes_t x;
	struct bcm63xx_runtime_data *prtd = substream->runtime->private_data;

	if (!prtd->dma_addr_next)
		prtd->dma_addr_next = substream->runtime->dma_addr;

	x = bytes_to_frames(substream->runtime,
		prtd->dma_addr_next - substream->runtime->dma_addr);

	return x == substream->runtime->buffer_size ? 0 : x;
}

static int bcm63xx_pcm_open(struct snd_soc_component *component,
			struct snd_pcm_substream *substream)
{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct bcm63xx_runtime_data *prtd;

	runtime->hw = bcm63xx_pcm_hardware;
	ret = snd_pcm_hw_constraint_step(runtime, 0,
					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (ret)
		goto out;

	ret = snd_pcm_hw_constraint_step(runtime, 0,
					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (ret)
		goto out;

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	ret = -ENOMEM;
	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
	if (!prtd)
		goto out;

	runtime->private_data = prtd;
	return 0;
out:
	return ret;
}

static int bcm63xx_pcm_close(struct snd_soc_component *component,
			struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct bcm63xx_runtime_data *prtd = runtime->private_data;

	kfree(prtd);
	return 0;
}

static irqreturn_t i2s_dma_isr(int irq, void *bcm_i2s_priv)
{
	unsigned int availdepth, ifflevel, offlevel, int_status, val_1, val_2;
	struct bcm63xx_runtime_data *prtd;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
	struct regmap *regmap_i2s;
	struct i2s_dma_desc *dma_desc;
	struct snd_soc_pcm_runtime *rtd;
	struct bcm_i2s_priv *i2s_priv;

	i2s_priv = (struct bcm_i2s_priv *)bcm_i2s_priv;
	regmap_i2s = i2s_priv->regmap_i2s;

	/* rx */
	regmap_read(regmap_i2s, I2S_RX_IRQ_CTL, &int_status);

	if (int_status & I2S_RX_DESC_OFF_INTR_EN_MSK) {
		substream = i2s_priv->capture_substream;
		runtime = substream->runtime;
		rtd = snd_soc_substream_to_rtd(substream);
		prtd = runtime->private_data;
		dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);

		offlevel = (int_status & I2S_RX_DESC_OFF_LEVEL_MASK) >>
			   I2S_RX_DESC_OFF_LEVEL_SHIFT;
		while (offlevel) {
			regmap_read(regmap_i2s, I2S_RX_DESC_OFF_ADDR, &val_1);
			regmap_read(regmap_i2s, I2S_RX_DESC_OFF_LEN, &val_2);
			offlevel--;
		}
		prtd->dma_addr_next = val_1 + val_2;
		ifflevel = (int_status & I2S_RX_DESC_IFF_LEVEL_MASK) >>
			   I2S_RX_DESC_IFF_LEVEL_SHIFT;

		availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;
		while (availdepth) {
			dma_desc->dma_addr +=
					snd_pcm_lib_period_bytes(substream);
			dma_desc->dma_area +=
					snd_pcm_lib_period_bytes(substream);
			if (dma_desc->dma_addr - runtime->dma_addr >=
						runtime->dma_bytes) {
				dma_desc->dma_addr = runtime->dma_addr;
				dma_desc->dma_area = runtime->dma_area;
			}

			prtd->dma_addr = dma_desc->dma_addr;
			regmap_write(regmap_i2s, I2S_RX_DESC_IFF_LEN,
				     snd_pcm_lib_period_bytes(substream));
			regmap_write(regmap_i2s, I2S_RX_DESC_IFF_ADDR,
				     dma_desc->dma_addr);
			availdepth--;
		}

		snd_pcm_period_elapsed(substream);

		/* Clear interrupt by writing 0 */
		regmap_update_bits(regmap_i2s, I2S_RX_IRQ_CTL,
				   I2S_RX_INTR_MASK, 0);
	}

	/* tx */
	regmap_read(regmap_i2s, I2S_TX_IRQ_CTL, &int_status);

	if (int_status & I2S_TX_DESC_OFF_INTR_EN_MSK) {
		substream = i2s_priv->play_substream;
		runtime = substream->runtime;
		rtd = snd_soc_substream_to_rtd(substream);
		prtd = runtime->private_data;
		dma_desc = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);

		offlevel = (int_status & I2S_TX_DESC_OFF_LEVEL_MASK) >>
			   I2S_TX_DESC_OFF_LEVEL_SHIFT;
		while (offlevel) {
			regmap_read(regmap_i2s, I2S_TX_DESC_OFF_ADDR, &val_1);
			regmap_read(regmap_i2s, I2S_TX_DESC_OFF_LEN,  &val_2);
			prtd->dma_addr_next = val_1 + val_2;
			offlevel--;
		}

		ifflevel = (int_status & I2S_TX_DESC_IFF_LEVEL_MASK) >>
			I2S_TX_DESC_IFF_LEVEL_SHIFT;
		availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;

		while (availdepth) {
			dma_desc->dma_addr +=
					snd_pcm_lib_period_bytes(substream);
			dma_desc->dma_area +=
					snd_pcm_lib_period_bytes(substream);

			if (dma_desc->dma_addr - runtime->dma_addr >=
							runtime->dma_bytes) {
				dma_desc->dma_addr = runtime->dma_addr;
				dma_desc->dma_area = runtime->dma_area;
			}

			prtd->dma_addr = dma_desc->dma_addr;
			regmap_write(regmap_i2s, I2S_TX_DESC_IFF_LEN,
				snd_pcm_lib_period_bytes(substream));
			regmap_write(regmap_i2s, I2S_TX_DESC_IFF_ADDR,
					dma_desc->dma_addr);
			availdepth--;
		}

		snd_pcm_period_elapsed(substream);

		/* Clear interrupt by writing 0 */
		regmap_update_bits(regmap_i2s, I2S_TX_IRQ_CTL,
				   I2S_TX_INTR_MASK, 0);
	}

	return IRQ_HANDLED;
}

static int bcm63xx_soc_pcm_new(struct snd_soc_component *component,
		struct snd_soc_pcm_runtime *rtd)
{
	struct snd_pcm *pcm = rtd->pcm;
	struct bcm_i2s_priv *i2s_priv;
	int ret;

	i2s_priv = dev_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0)->dev);

	of_dma_configure(pcm->card->dev, pcm->card->dev->of_node, 1);

	ret = dma_coerce_mask_and_coherent(pcm->card->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
		i2s_priv->play_substream =
			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
		i2s_priv->capture_substream =
			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;

	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
					    pcm->card->dev,
					    bcm63xx_pcm_hardware.buffer_bytes_max);
}

static const struct snd_soc_component_driver bcm63xx_soc_platform = {
	.open = bcm63xx_pcm_open,
	.close = bcm63xx_pcm_close,
	.hw_params = bcm63xx_pcm_hw_params,
	.hw_free = bcm63xx_pcm_hw_free,
	.prepare = bcm63xx_pcm_prepare,
	.trigger = bcm63xx_pcm_trigger,
	.pointer = bcm63xx_pcm_pointer,
	.pcm_construct = bcm63xx_soc_pcm_new,
};

int bcm63xx_soc_platform_probe(struct platform_device *pdev,
			       struct bcm_i2s_priv *i2s_priv)
{
	int ret;

	ret = platform_get_irq(pdev, 0);
	if (ret < 0)
		return ret;

	ret = devm_request_irq(&pdev->dev, ret, i2s_dma_isr,
			       irq_get_trigger_type(ret), "i2s_dma", (void *)i2s_priv);
	if (ret) {
		dev_err(&pdev->dev,
			"i2s_init: failed to request interrupt.ret=%d\n", ret);
		return ret;
	}

	return devm_snd_soc_register_component(&pdev->dev,
					&bcm63xx_soc_platform, NULL, 0);
}

int bcm63xx_soc_platform_remove(struct platform_device *pdev)
{
	return 0;
}

MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");
MODULE_DESCRIPTION("Broadcom DSL XPON ASOC PCM Interface");
MODULE_LICENSE("GPL v2");