summaryrefslogtreecommitdiffstats
path: root/kernel/sound/soc/sti/uniperif_reader.c
blob: 8a0eb20501694b16bf90991c3bbd71bce1461296 (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) STMicroelectronics SA 2015
 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
 *          for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>

#include <sound/soc.h>

#include "uniperif.h"

/*
 * Note: snd_pcm_hardware is linked to DMA controller but is declared here to
 * integrate unireader capability in term of rate and supported channels
 */
static const struct snd_pcm_hardware uni_reader_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,

	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.rate_min = 8000,
	.rate_max = 96000,

	.channels_min = 2,
	.channels_max = 8,

	.periods_min = 2,
	.periods_max = 48,

	.period_bytes_min = 128,
	.period_bytes_max = 64 * PAGE_SIZE,
	.buffer_bytes_max = 256 * PAGE_SIZE
};

/*
 * uni_reader_irq_handler
 * In case of error audio stream is stopped; stop action is protected via PCM
 * stream lock  to avoid race condition with trigger callback.
 */
static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
{
	irqreturn_t ret = IRQ_NONE;
	struct uniperif *reader = dev_id;
	unsigned int status;

	if (reader->state == UNIPERIF_STATE_STOPPED) {
		/* Unexpected IRQ: do nothing */
		dev_warn(reader->dev, "unexpected IRQ ");
		return IRQ_HANDLED;
	}

	/* Get interrupt status & clear them immediately */
	status = GET_UNIPERIF_ITS(reader);
	SET_UNIPERIF_ITS_BCLR(reader, status);

	/* Check for fifo overflow error */
	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
		dev_err(reader->dev, "FIFO error detected");

		snd_pcm_stream_lock(reader->substream);
		snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock(reader->substream);

		return IRQ_HANDLED;
	}

	return ret;
}

static int uni_reader_prepare(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	struct uniperif *reader = priv->dai_data.uni;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int transfer_size, trigger_limit;
	int slot_width;
	int count = 10;

	/* The reader should be stopped */
	if (reader->state != UNIPERIF_STATE_STOPPED) {
		dev_err(reader->dev, "%s: invalid reader state %d", __func__,
			reader->state);
		return -EINVAL;
	}

	/* Calculate transfer size (in fifo cells and bytes) for frame count */
	transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;

	/* Calculate number of empty cells available before asserting DREQ */
	if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
		trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
	else
		/*
		 * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
		 * FDMA_TRIGGER_LIMIT also controls when the state switches
		 * from OFF or STANDBY to AUDIO DATA.
		 */
		trigger_limit = transfer_size;

	/* Trigger limit must be an even number */
	if ((!trigger_limit % 2) ||
	    (trigger_limit != 1 && transfer_size % 2) ||
	    (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
		dev_err(reader->dev, "invalid trigger limit %d", trigger_limit);
		return -EINVAL;
	}

	SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);

	switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
	case SND_SOC_DAIFMT_NB_IF:
		SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
		break;
	default:
		SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
	}

	/* Force slot width to 32 in I2S mode */
	if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
		== SND_SOC_DAIFMT_I2S) {
		slot_width = 32;
	} else {
		switch (runtime->format) {
		case SNDRV_PCM_FORMAT_S16_LE:
			slot_width = 16;
			break;
		default:
			slot_width = 32;
			break;
		}
	}

	/* Number of bits per subframe (i.e one channel sample) on input. */
	switch (slot_width) {
	case 32:
		SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
		SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
		break;
	case 16:
		SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
		SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
		break;
	default:
		dev_err(reader->dev, "subframe format not supported");
		return -EINVAL;
	}

	/* Configure data memory format */
	switch (runtime->format) {
	case SNDRV_PCM_FORMAT_S16_LE:
		/* One data word contains two samples */
		SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
		break;

	case SNDRV_PCM_FORMAT_S32_LE:
		/*
		 * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
		 * on the MSB then zeros (if less than 32 bytes)"...
		 */
		SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
		break;

	default:
		dev_err(reader->dev, "format not supported");
		return -EINVAL;
	}

	switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
		SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
		break;
	default:
		dev_err(reader->dev, "format not supported");
		return -EINVAL;
	}

	SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);

	/* Data clocking (changing) on the rising edge */
	SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);

	/* Number of channels must be even */

	if ((runtime->channels % 2) || (runtime->channels < 2) ||
	    (runtime->channels > 10)) {
		dev_err(reader->dev, "%s: invalid nb of channels", __func__);
		return -EINVAL;
	}

	SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);

	/* Clear any pending interrupts */
	SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));

	SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);

	/* Set the interrupt mask */
	SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
	SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);

	/* Enable underflow recovery interrupts */
	if (reader->info->underflow_enabled) {
		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
	}

	/* Reset uniperipheral reader */
	SET_UNIPERIF_SOFT_RST_SOFT_RST(reader);

	while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) {
		udelay(5);
		count--;
	}
	if (!count) {
		dev_err(reader->dev, "Failed to reset uniperif");
		return -EIO;
	}

	return 0;
}

static int uni_reader_start(struct uniperif *reader)
{
	/* The reader should be stopped */
	if (reader->state != UNIPERIF_STATE_STOPPED) {
		dev_err(reader->dev, "%s: invalid reader state", __func__);
		return -EINVAL;
	}

	/* Enable reader interrupts (and clear possible stalled ones) */
	SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);
	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);

	/* Launch the reader */
	SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);

	/* Update state to started */
	reader->state = UNIPERIF_STATE_STARTED;
	return 0;
}

static int uni_reader_stop(struct uniperif *reader)
{
	/* The reader should not be in stopped state */
	if (reader->state == UNIPERIF_STATE_STOPPED) {
		dev_err(reader->dev, "%s: invalid reader state", __func__);
		return -EINVAL;
	}

	/* Turn the reader off */
	SET_UNIPERIF_CTRL_OPERATION_OFF(reader);

	/* Disable interrupts */
	SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));

	/* Update state to stopped and return */
	reader->state = UNIPERIF_STATE_STOPPED;

	return 0;
}

static int  uni_reader_trigger(struct snd_pcm_substream *substream,
			       int cmd, struct snd_soc_dai *dai)
{
	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	struct uniperif *reader = priv->dai_data.uni;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		return  uni_reader_start(reader);
	case SNDRV_PCM_TRIGGER_STOP:
		return  uni_reader_stop(reader);
	default:
		return -EINVAL;
	}
}

static void uni_reader_shutdown(struct snd_pcm_substream *substream,
				struct snd_soc_dai *dai)
{
	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
	struct uniperif *reader = priv->dai_data.uni;

	if (reader->state != UNIPERIF_STATE_STOPPED) {
		/* Stop the reader */
		uni_reader_stop(reader);
	}
}

static int uni_reader_parse_dt(struct platform_device *pdev,
			       struct uniperif *reader)
{
	struct uniperif_info *info;
	struct device_node *node = pdev->dev.of_node;

	/* Allocate memory for the info structure */
	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (of_property_read_u32(node, "st,version", &reader->ver) ||
	    reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) {
		dev_err(&pdev->dev, "Unknown uniperipheral version ");
		return -EINVAL;
	}

	/* Save the info structure */
	reader->info = info;

	return 0;
}

static const struct snd_soc_dai_ops uni_reader_dai_ops = {
		.shutdown = uni_reader_shutdown,
		.prepare = uni_reader_prepare,
		.trigger = uni_reader_trigger,
		.hw_params = sti_uniperiph_dai_hw_params,
		.set_fmt = sti_uniperiph_dai_set_fmt,
};

int uni_reader_init(struct platform_device *pdev,
		    struct uniperif *reader)
{
	int ret = 0;

	reader->dev = &pdev->dev;
	reader->state = UNIPERIF_STATE_STOPPED;
	reader->hw = &uni_reader_pcm_hw;
	reader->dai_ops = &uni_reader_dai_ops;

	ret = uni_reader_parse_dt(pdev, reader);
	if (ret < 0) {
		dev_err(reader->dev, "Failed to parse DeviceTree");
		return ret;
	}

	ret = devm_request_irq(&pdev->dev, reader->irq,
			       uni_reader_irq_handler, IRQF_SHARED,
			       dev_name(&pdev->dev), reader);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to request IRQ");
		return -EBUSY;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(uni_reader_init);