summaryrefslogtreecommitdiff
path: root/sound/soc/codecs/rt5514-spi.c
blob: 09103aab0cb2639486cb59f746619c9ea743890a (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
/*
 * rt5514-spi.c  --  RT5514 SPI driver
 *
 * Copyright 2015 Realtek Semiconductor Corp.
 * Author: Oder Chiou <oder_chiou@realtek.com>
 *
 * 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/input.h>
#include <linux/spi/spi.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_qos.h>
#include <linux/sysfs.h>
#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "rt5514-spi.h"

static struct spi_device *rt5514_spi;

struct rt5514_dsp {
	struct device *dev;
	struct delayed_work copy_work;
	struct mutex dma_lock;
	struct snd_pcm_substream *substream;
	unsigned int buf_base, buf_limit, buf_rp;
	size_t buf_size;
	size_t dma_offset;
	size_t dsp_offset;
};

static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.period_bytes_min	= PAGE_SIZE,
	.period_bytes_max	= 0x20000 / 8,
	.periods_min		= 8,
	.periods_max		= 8,
	.channels_min		= 1,
	.channels_max		= 1,
	.buffer_bytes_max	= 0x20000,
};

static struct snd_soc_dai_driver rt5514_spi_dai = {
	.name = "rt5514-dsp-cpu-dai",
	.id = 0,
	.capture = {
		.stream_name = "DSP Capture",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_16000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
};

static void rt5514_spi_copy_work(struct work_struct *work)
{
	struct rt5514_dsp *rt5514_dsp =
		container_of(work, struct rt5514_dsp, copy_work.work);
	struct snd_pcm_runtime *runtime;
	size_t period_bytes, truncated_bytes = 0;

	mutex_lock(&rt5514_dsp->dma_lock);
	if (!rt5514_dsp->substream) {
		dev_err(rt5514_dsp->dev, "No pcm substream\n");
		goto done;
	}

	runtime = rt5514_dsp->substream->runtime;
	period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);

	if (rt5514_dsp->buf_size - rt5514_dsp->dsp_offset <  period_bytes)
		period_bytes = rt5514_dsp->buf_size - rt5514_dsp->dsp_offset;

	if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
		rt5514_spi_burst_read(rt5514_dsp->buf_rp,
			runtime->dma_area + rt5514_dsp->dma_offset,
			period_bytes);

		if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
			rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
		else
			rt5514_dsp->buf_rp += period_bytes;
	} else {
		truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
		rt5514_spi_burst_read(rt5514_dsp->buf_rp,
			runtime->dma_area + rt5514_dsp->dma_offset,
			truncated_bytes);

		rt5514_spi_burst_read(rt5514_dsp->buf_base,
			runtime->dma_area + rt5514_dsp->dma_offset +
			truncated_bytes, period_bytes - truncated_bytes);

			rt5514_dsp->buf_rp = rt5514_dsp->buf_base +
				period_bytes - truncated_bytes;
	}

	rt5514_dsp->dma_offset += period_bytes;
	if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
		rt5514_dsp->dma_offset = 0;

	rt5514_dsp->dsp_offset += period_bytes;

	snd_pcm_period_elapsed(rt5514_dsp->substream);

	if (rt5514_dsp->dsp_offset < rt5514_dsp->buf_size)
		schedule_delayed_work(&rt5514_dsp->copy_work, 5);
done:
	mutex_unlock(&rt5514_dsp->dma_lock);
}

/* PCM for streaming audio from the DSP buffer */
static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
{
	snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);

	return 0;
}

static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
			       struct snd_pcm_hw_params *hw_params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct rt5514_dsp *rt5514_dsp =
			snd_soc_platform_get_drvdata(rtd->platform);
	int ret;

	mutex_lock(&rt5514_dsp->dma_lock);
	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
			params_buffer_bytes(hw_params));
	rt5514_dsp->substream = substream;
	mutex_unlock(&rt5514_dsp->dma_lock);

	return ret;
}

static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct rt5514_dsp *rt5514_dsp =
			snd_soc_platform_get_drvdata(rtd->platform);

	mutex_lock(&rt5514_dsp->dma_lock);
	rt5514_dsp->substream = NULL;
	mutex_unlock(&rt5514_dsp->dma_lock);

	cancel_delayed_work_sync(&rt5514_dsp->copy_work);

	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

static int rt5514_spi_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct rt5514_dsp *rt5514_dsp =
			snd_soc_platform_get_drvdata(rtd->platform);
	u8 buf[8];

	rt5514_dsp->dma_offset = 0;
	rt5514_dsp->dsp_offset = 0;

	/**
	 * The address area x1800XXXX is the register address, and it cannot
	 * support spi burst read perfectly. So we use the spi burst read
	 * individually to make sure the data correctly.
	*/
	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
		sizeof(buf));
	rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;

	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
		sizeof(buf));
	rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;

	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_RP, (u8 *)&buf,
		sizeof(buf));
	rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;

	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_SIZE, (u8 *)&buf,
		sizeof(buf));
	rt5514_dsp->buf_size = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;

	return 0;
}

static int rt5514_spi_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct rt5514_dsp *rt5514_dsp =
			snd_soc_platform_get_drvdata(rtd->platform);

	if (cmd == SNDRV_PCM_TRIGGER_START) {
		if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
			rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
			schedule_delayed_work(&rt5514_dsp->copy_work, 0);
	}

	return 0;
}

static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
		struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct rt5514_dsp *rt5514_dsp =
		snd_soc_platform_get_drvdata(rtd->platform);

	return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
}

static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
	.open		= rt5514_spi_pcm_open,
	.hw_params	= rt5514_spi_hw_params,
	.hw_free	= rt5514_spi_hw_free,
	.trigger	= rt5514_spi_trigger,
	.prepare	= rt5514_spi_prepare,
	.pointer	= rt5514_spi_pcm_pointer,
	.mmap		= snd_pcm_lib_mmap_vmalloc,
	.page		= snd_pcm_lib_get_vmalloc_page,
};

static int rt5514_spi_pcm_probe(struct snd_soc_platform *platform)
{
	struct rt5514_dsp *rt5514_dsp;

	rt5514_dsp = devm_kzalloc(platform->dev, sizeof(*rt5514_dsp),
			GFP_KERNEL);

	rt5514_dsp->dev = &rt5514_spi->dev;
	mutex_init(&rt5514_dsp->dma_lock);
	INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
	snd_soc_platform_set_drvdata(platform, rt5514_dsp);

	return 0;
}

static struct snd_soc_platform_driver rt5514_spi_platform = {
	.probe = rt5514_spi_pcm_probe,
	.ops = &rt5514_spi_pcm_ops,
};

static const struct snd_soc_component_driver rt5514_spi_dai_component = {
	.name		= "rt5514-spi-dai",
};

/**
 * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
 * @addr: Start address.
 * @rxbuf: Data Buffer for reading.
 * @len: Data length, it must be a multiple of 8.
 *
 *
 * Returns true for success.
 */
int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
{
	u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
	int status;
	u8 write_buf[8];
	unsigned int i, end, offset = 0;

	struct spi_message message;
	struct spi_transfer x[3];

	while (offset < len) {
		if (offset + RT5514_SPI_BUF_LEN <= len)
			end = RT5514_SPI_BUF_LEN;
		else
			end = len % RT5514_SPI_BUF_LEN;

		write_buf[0] = spi_cmd;
		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;

		spi_message_init(&message);
		memset(x, 0, sizeof(x));

		x[0].len = 5;
		x[0].tx_buf = write_buf;
		spi_message_add_tail(&x[0], &message);

		x[1].len = 4;
		x[1].tx_buf = write_buf;
		spi_message_add_tail(&x[1], &message);

		x[2].len = end;
		x[2].rx_buf = rxbuf + offset;
		spi_message_add_tail(&x[2], &message);

		status = spi_sync(rt5514_spi, &message);

		if (status)
			return false;

		offset += RT5514_SPI_BUF_LEN;
	}

	for (i = 0; i < len; i += 8) {
		write_buf[0] = rxbuf[i + 0];
		write_buf[1] = rxbuf[i + 1];
		write_buf[2] = rxbuf[i + 2];
		write_buf[3] = rxbuf[i + 3];
		write_buf[4] = rxbuf[i + 4];
		write_buf[5] = rxbuf[i + 5];
		write_buf[6] = rxbuf[i + 6];
		write_buf[7] = rxbuf[i + 7];

		rxbuf[i + 0] = write_buf[7];
		rxbuf[i + 1] = write_buf[6];
		rxbuf[i + 2] = write_buf[5];
		rxbuf[i + 3] = write_buf[4];
		rxbuf[i + 4] = write_buf[3];
		rxbuf[i + 5] = write_buf[2];
		rxbuf[i + 6] = write_buf[1];
		rxbuf[i + 7] = write_buf[0];
	}

	return true;
}

/**
 * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
 * @addr: Start address.
 * @txbuf: Data Buffer for writng.
 * @len: Data length, it must be a multiple of 8.
 *
 *
 * Returns true for success.
 */
int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
{
	u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
	u8 *write_buf;
	unsigned int i, end, offset = 0;

	write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);

	if (write_buf == NULL)
		return -ENOMEM;

	while (offset < len) {
		if (offset + RT5514_SPI_BUF_LEN <= len)
			end = RT5514_SPI_BUF_LEN;
		else
			end = len % RT5514_SPI_BUF_LEN;

		write_buf[0] = spi_cmd;
		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;

		for (i = 0; i < end; i += 8) {
			write_buf[i + 12] = txbuf[offset + i + 0];
			write_buf[i + 11] = txbuf[offset + i + 1];
			write_buf[i + 10] = txbuf[offset + i + 2];
			write_buf[i +  9] = txbuf[offset + i + 3];
			write_buf[i +  8] = txbuf[offset + i + 4];
			write_buf[i +  7] = txbuf[offset + i + 5];
			write_buf[i +  6] = txbuf[offset + i + 6];
			write_buf[i +  5] = txbuf[offset + i + 7];
		}

		write_buf[end + 5] = spi_cmd;

		spi_write(rt5514_spi, write_buf, end + 6);

		offset += RT5514_SPI_BUF_LEN;
	}

	kfree(write_buf);

	return 0;
}
EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);

static int rt5514_spi_probe(struct spi_device *spi)
{
	int ret;

	rt5514_spi = spi;

	ret = devm_snd_soc_register_platform(&spi->dev, &rt5514_spi_platform);
	if (ret < 0) {
		dev_err(&spi->dev, "Failed to register platform.\n");
		return ret;
	}

	ret = devm_snd_soc_register_component(&spi->dev,
					      &rt5514_spi_dai_component,
					      &rt5514_spi_dai, 1);
	if (ret < 0) {
		dev_err(&spi->dev, "Failed to register component.\n");
		return ret;
	}

	return 0;
}

static const struct of_device_id rt5514_of_match[] = {
	{ .compatible = "realtek,rt5514", },
	{},
};
MODULE_DEVICE_TABLE(of, rt5514_of_match);

static struct spi_driver rt5514_spi_driver = {
	.driver = {
		.name = "rt5514",
		.of_match_table = of_match_ptr(rt5514_of_match),
	},
	.probe = rt5514_spi_probe,
};
module_spi_driver(rt5514_spi_driver);

MODULE_DESCRIPTION("RT5514 SPI driver");
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
MODULE_LICENSE("GPL v2");