summaryrefslogtreecommitdiff
path: root/sound/soc/pxa/mmp-sspa.c
blob: 12d4513ebe8af17ba22614053a27b2ad2dbe23ee (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
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/*
 * linux/sound/soc/pxa/mmp-sspa.c
 * Base on pxa2xx-ssp.c
 *
 * Copyright (C) 2011 Marvell International Ltd.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/pxa2xx_ssp.h>
#include <linux/io.h>
#include <linux/dmaengine.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/pxa2xx-lib.h>
#include <sound/dmaengine_pcm.h>
#include "mmp-sspa.h"

/*
 * SSPA audio private data
 */
struct sspa_priv {
	struct ssp_device *sspa;
	struct snd_dmaengine_dai_dma_data *dma_params;
	struct clk *audio_clk;
	struct clk *sysclk;
	int dai_fmt;
	int running_cnt;
};

static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val)
{
	__raw_writel(val, sspa->mmio_base + reg);
}

static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg)
{
	return __raw_readl(sspa->mmio_base + reg);
}

static void mmp_sspa_tx_enable(struct ssp_device *sspa)
{
	unsigned int sspa_sp;

	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
	sspa_sp |= SSPA_SP_S_EN;
	sspa_sp |= SSPA_SP_WEN;
	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
}

static void mmp_sspa_tx_disable(struct ssp_device *sspa)
{
	unsigned int sspa_sp;

	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
	sspa_sp &= ~SSPA_SP_S_EN;
	sspa_sp |= SSPA_SP_WEN;
	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
}

static void mmp_sspa_rx_enable(struct ssp_device *sspa)
{
	unsigned int sspa_sp;

	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
	sspa_sp |= SSPA_SP_S_EN;
	sspa_sp |= SSPA_SP_WEN;
	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
}

static void mmp_sspa_rx_disable(struct ssp_device *sspa)
{
	unsigned int sspa_sp;

	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
	sspa_sp &= ~SSPA_SP_S_EN;
	sspa_sp |= SSPA_SP_WEN;
	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
}

static int mmp_sspa_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
{
	struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);

	clk_enable(priv->sysclk);
	clk_enable(priv->sspa->clk);

	return 0;
}

static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
{
	struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);

	clk_disable(priv->sspa->clk);
	clk_disable(priv->sysclk);

}

/*
 * Set the SSP ports SYSCLK.
 */
static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
				    int clk_id, unsigned int freq, int dir)
{
	struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	int ret = 0;

	switch (clk_id) {
	case MMP_SSPA_CLK_AUDIO:
		ret = clk_set_rate(priv->audio_clk, freq);
		if (ret)
			return ret;
		break;
	case MMP_SSPA_CLK_PLL:
	case MMP_SSPA_CLK_VCXO:
		/* not support yet */
		return -EINVAL;
	default:
		return -EINVAL;
	}

	return 0;
}

static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
				 int source, unsigned int freq_in,
				 unsigned int freq_out)
{
	struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	int ret = 0;

	switch (pll_id) {
	case MMP_SYSCLK:
		ret = clk_set_rate(priv->sysclk, freq_out);
		if (ret)
			return ret;
		break;
	case MMP_SSPA_CLK:
		ret = clk_set_rate(priv->sspa->clk, freq_out);
		if (ret)
			return ret;
		break;
	default:
		return -ENODEV;
	}

	return 0;
}

/*
 * Set up the sspa dai format. The sspa port must be inactive
 * before calling this function as the physical
 * interface format is changed.
 */
static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
				 unsigned int fmt)
{
	struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(cpu_dai);
	struct ssp_device *sspa = sspa_priv->sspa;
	u32 sspa_sp, sspa_ctrl;

	/* check if we need to change anything at all */
	if (sspa_priv->dai_fmt == fmt)
		return 0;

	/* we can only change the settings if the port is not in use */
	if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) ||
	    (mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) {
		dev_err(&sspa->pdev->dev,
			"can't change hardware dai format: stream is in use\n");
		return -EINVAL;
	}

	/* reset port settings */
	sspa_sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
	sspa_ctrl = 0;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		sspa_sp |= SSPA_SP_MSL;
		break;
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		sspa_sp |= SSPA_SP_FSP;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		sspa_sp |= SSPA_TXSP_FPER(63);
		sspa_sp |= SSPA_SP_FWID(31);
		sspa_ctrl |= SSPA_CTL_XDATDLY(1);
		break;
	default:
		return -EINVAL;
	}

	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);

	sspa_sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);

	/*
	 * FIXME: hw issue, for the tx serial port,
	 * can not config the master/slave mode;
	 * so must clean this bit.
	 * The master/slave mode has been set in the
	 * rx port.
	 */
	sspa_sp &= ~SSPA_SP_MSL;
	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);

	mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
	mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);

	/* Since we are configuring the timings for the format by hand
	 * we have to defer some things until hw_params() where we
	 * know parameters like the sample size.
	 */
	sspa_priv->dai_fmt = fmt;
	return 0;
}

/*
 * Set the SSPA audio DMA parameters and sample size.
 * Can be called multiple times by oss emulation.
 */
static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
			       struct snd_pcm_hw_params *params,
			       struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
	struct ssp_device *sspa = sspa_priv->sspa;
	struct snd_dmaengine_dai_dma_data *dma_params;
	u32 sspa_ctrl;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_TXCTL);
	else
		sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_RXCTL);

	sspa_ctrl &= ~SSPA_CTL_XFRLEN1_MASK;
	sspa_ctrl |= SSPA_CTL_XFRLEN1(params_channels(params) - 1);
	sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
	sspa_ctrl |= SSPA_CTL_XWDLEN1(SSPA_CTL_32_BITS);
	sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_8_BITS);
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS);
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS);
		break;
	case SNDRV_PCM_FORMAT_S24_3LE:
		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_32_BITS);
		break;
	default:
		return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
		mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1);
	} else {
		mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
		mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0);
	}

	dma_params = &sspa_priv->dma_params[substream->stream];
	dma_params->addr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
				(sspa->phys_base + SSPA_TXD) :
				(sspa->phys_base + SSPA_RXD);
	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_params);
	return 0;
}

static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
			     struct snd_soc_dai *dai)
{
	struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
	struct ssp_device *sspa = sspa_priv->sspa;
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		/*
		 * whatever playback or capture, must enable rx.
		 * this is a hw issue, so need check if rx has been
		 * enabled or not; if has been enabled by another
		 * stream, do not enable again.
		 */
		if (!sspa_priv->running_cnt)
			mmp_sspa_rx_enable(sspa);

		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			mmp_sspa_tx_enable(sspa);

		sspa_priv->running_cnt++;
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		sspa_priv->running_cnt--;

		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			mmp_sspa_tx_disable(sspa);

		/* have no capture stream, disable rx port */
		if (!sspa_priv->running_cnt)
			mmp_sspa_rx_disable(sspa);
		break;

	default:
		ret = -EINVAL;
	}

	return ret;
}

static int mmp_sspa_probe(struct snd_soc_dai *dai)
{
	struct sspa_priv *priv = dev_get_drvdata(dai->dev);

	snd_soc_dai_set_drvdata(dai, priv);
	return 0;

}

#define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
#define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
		SNDRV_PCM_FMTBIT_S16_LE | \
		SNDRV_PCM_FMTBIT_S24_LE | \
		SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
	.startup	= mmp_sspa_startup,
	.shutdown	= mmp_sspa_shutdown,
	.trigger	= mmp_sspa_trigger,
	.hw_params	= mmp_sspa_hw_params,
	.set_sysclk	= mmp_sspa_set_dai_sysclk,
	.set_pll	= mmp_sspa_set_dai_pll,
	.set_fmt	= mmp_sspa_set_dai_fmt,
};

static struct snd_soc_dai_driver mmp_sspa_dai = {
	.probe = mmp_sspa_probe,
	.playback = {
		.channels_min = 1,
		.channels_max = 128,
		.rates = MMP_SSPA_RATES,
		.formats = MMP_SSPA_FORMATS,
	},
	.capture = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = MMP_SSPA_RATES,
		.formats = MMP_SSPA_FORMATS,
	},
	.ops = &mmp_sspa_dai_ops,
};

static const struct snd_soc_component_driver mmp_sspa_component = {
	.name		= "mmp-sspa",
};

static int asoc_mmp_sspa_probe(struct platform_device *pdev)
{
	struct sspa_priv *priv;
	struct resource *res;

	priv = devm_kzalloc(&pdev->dev,
				sizeof(struct sspa_priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->sspa = devm_kzalloc(&pdev->dev,
				sizeof(struct ssp_device), GFP_KERNEL);
	if (priv->sspa == NULL)
		return -ENOMEM;

	priv->dma_params = devm_kcalloc(&pdev->dev,
			2, sizeof(struct snd_dmaengine_dai_dma_data),
			GFP_KERNEL);
	if (priv->dma_params == NULL)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->sspa->mmio_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->sspa->mmio_base))
		return PTR_ERR(priv->sspa->mmio_base);

	priv->sspa->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->sspa->clk))
		return PTR_ERR(priv->sspa->clk);

	priv->audio_clk = clk_get(NULL, "mmp-audio");
	if (IS_ERR(priv->audio_clk))
		return PTR_ERR(priv->audio_clk);

	priv->sysclk = clk_get(NULL, "mmp-sysclk");
	if (IS_ERR(priv->sysclk)) {
		clk_put(priv->audio_clk);
		return PTR_ERR(priv->sysclk);
	}
	clk_enable(priv->audio_clk);
	priv->dai_fmt = (unsigned int) -1;
	platform_set_drvdata(pdev, priv);

	return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
					       &mmp_sspa_dai, 1);
}

static int asoc_mmp_sspa_remove(struct platform_device *pdev)
{
	struct sspa_priv *priv = platform_get_drvdata(pdev);

	clk_disable(priv->audio_clk);
	clk_put(priv->audio_clk);
	clk_put(priv->sysclk);
	return 0;
}

static struct platform_driver asoc_mmp_sspa_driver = {
	.driver = {
		.name = "mmp-sspa-dai",
	},
	.probe = asoc_mmp_sspa_probe,
	.remove = asoc_mmp_sspa_remove,
};

module_platform_driver(asoc_mmp_sspa_driver);

MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
MODULE_DESCRIPTION("MMP SSPA SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mmp-sspa-dai");