aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/tegra/tegra20_spdif.c
blob: 551b3c93ce932c77e9e05de4bcf01f5af63d1c94 (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
/*
 * tegra20_spdif.c - Tegra20 SPDIF driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2011-2012 - NVIDIA, Inc.
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>

#include "tegra20_spdif.h"

#define DRV_NAME "tegra20-spdif"

static int tegra20_spdif_runtime_suspend(struct device *dev)
{
	struct tegra20_spdif *spdif = dev_get_drvdata(dev);

	clk_disable_unprepare(spdif->clk_spdif_out);

	return 0;
}

static int tegra20_spdif_runtime_resume(struct device *dev)
{
	struct tegra20_spdif *spdif = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(spdif->clk_spdif_out);
	if (ret) {
		dev_err(dev, "clk_enable failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct device *dev = dai->dev;
	struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
	unsigned int mask, val;
	int ret, spdifclock;

	mask = TEGRA20_SPDIF_CTRL_PACK |
	       TEGRA20_SPDIF_CTRL_BIT_MODE_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		val = TEGRA20_SPDIF_CTRL_PACK |
		      TEGRA20_SPDIF_CTRL_BIT_MODE_16BIT;
		break;
	default:
		return -EINVAL;
	}

	regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL, mask, val);

	switch (params_rate(params)) {
	case 32000:
		spdifclock = 4096000;
		break;
	case 44100:
		spdifclock = 5644800;
		break;
	case 48000:
		spdifclock = 6144000;
		break;
	case 88200:
		spdifclock = 11289600;
		break;
	case 96000:
		spdifclock = 12288000;
		break;
	case 176400:
		spdifclock = 22579200;
		break;
	case 192000:
		spdifclock = 24576000;
		break;
	default:
		return -EINVAL;
	}

	ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
	if (ret) {
		dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
		return ret;
	}

	return 0;
}

static void tegra20_spdif_start_playback(struct tegra20_spdif *spdif)
{
	regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
			   TEGRA20_SPDIF_CTRL_TX_EN,
			   TEGRA20_SPDIF_CTRL_TX_EN);
}

static void tegra20_spdif_stop_playback(struct tegra20_spdif *spdif)
{
	regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL,
			   TEGRA20_SPDIF_CTRL_TX_EN, 0);
}

static int tegra20_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
				struct snd_soc_dai *dai)
{
	struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		tegra20_spdif_start_playback(spdif);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		tegra20_spdif_stop_playback(spdif);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int tegra20_spdif_probe(struct snd_soc_dai *dai)
{
	struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);

	dai->capture_dma_data = NULL;
	dai->playback_dma_data = &spdif->playback_dma_data;

	return 0;
}

static const struct snd_soc_dai_ops tegra20_spdif_dai_ops = {
	.hw_params	= tegra20_spdif_hw_params,
	.trigger	= tegra20_spdif_trigger,
};

static struct snd_soc_dai_driver tegra20_spdif_dai = {
	.name = DRV_NAME,
	.probe = tegra20_spdif_probe,
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
				SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &tegra20_spdif_dai_ops,
};

static const struct snd_soc_component_driver tegra20_spdif_component = {
	.name		= DRV_NAME,
};

static bool tegra20_spdif_wr_rd_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA20_SPDIF_CTRL:
	case TEGRA20_SPDIF_STATUS:
	case TEGRA20_SPDIF_STROBE_CTRL:
	case TEGRA20_SPDIF_DATA_FIFO_CSR:
	case TEGRA20_SPDIF_DATA_OUT:
	case TEGRA20_SPDIF_DATA_IN:
	case TEGRA20_SPDIF_CH_STA_RX_A:
	case TEGRA20_SPDIF_CH_STA_RX_B:
	case TEGRA20_SPDIF_CH_STA_RX_C:
	case TEGRA20_SPDIF_CH_STA_RX_D:
	case TEGRA20_SPDIF_CH_STA_RX_E:
	case TEGRA20_SPDIF_CH_STA_RX_F:
	case TEGRA20_SPDIF_CH_STA_TX_A:
	case TEGRA20_SPDIF_CH_STA_TX_B:
	case TEGRA20_SPDIF_CH_STA_TX_C:
	case TEGRA20_SPDIF_CH_STA_TX_D:
	case TEGRA20_SPDIF_CH_STA_TX_E:
	case TEGRA20_SPDIF_CH_STA_TX_F:
	case TEGRA20_SPDIF_USR_STA_RX_A:
	case TEGRA20_SPDIF_USR_DAT_TX_A:
		return true;
	default:
		return false;
	};
}

static bool tegra20_spdif_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA20_SPDIF_STATUS:
	case TEGRA20_SPDIF_DATA_FIFO_CSR:
	case TEGRA20_SPDIF_DATA_OUT:
	case TEGRA20_SPDIF_DATA_IN:
	case TEGRA20_SPDIF_CH_STA_RX_A:
	case TEGRA20_SPDIF_CH_STA_RX_B:
	case TEGRA20_SPDIF_CH_STA_RX_C:
	case TEGRA20_SPDIF_CH_STA_RX_D:
	case TEGRA20_SPDIF_CH_STA_RX_E:
	case TEGRA20_SPDIF_CH_STA_RX_F:
	case TEGRA20_SPDIF_USR_STA_RX_A:
	case TEGRA20_SPDIF_USR_DAT_TX_A:
		return true;
	default:
		return false;
	};
}

static bool tegra20_spdif_precious_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA20_SPDIF_DATA_OUT:
	case TEGRA20_SPDIF_DATA_IN:
	case TEGRA20_SPDIF_USR_STA_RX_A:
	case TEGRA20_SPDIF_USR_DAT_TX_A:
		return true;
	default:
		return false;
	};
}

static const struct regmap_config tegra20_spdif_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = TEGRA20_SPDIF_USR_DAT_TX_A,
	.writeable_reg = tegra20_spdif_wr_rd_reg,
	.readable_reg = tegra20_spdif_wr_rd_reg,
	.volatile_reg = tegra20_spdif_volatile_reg,
	.precious_reg = tegra20_spdif_precious_reg,
	.cache_type = REGCACHE_RBTREE,
};

static int tegra20_spdif_platform_probe(struct platform_device *pdev)
{
	struct tegra20_spdif *spdif;
	struct resource *mem, *memregion, *dmareq;
	void __iomem *regs;
	int ret;

	spdif = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_spdif),
			     GFP_KERNEL);
	if (!spdif) {
		dev_err(&pdev->dev, "Can't allocate tegra20_spdif\n");
		ret = -ENOMEM;
		goto err;
	}
	dev_set_drvdata(&pdev->dev, spdif);

	spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out");
	if (IS_ERR(spdif->clk_spdif_out)) {
		pr_err("Can't retrieve spdif clock\n");
		ret = PTR_ERR(spdif->clk_spdif_out);
		goto err;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "No memory resource\n");
		ret = -ENODEV;
		goto err_clk_put;
	}

	dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dmareq) {
		dev_err(&pdev->dev, "No DMA resource\n");
		ret = -ENODEV;
		goto err_clk_put;
	}

	memregion = devm_request_mem_region(&pdev->dev, mem->start,
					    resource_size(mem), DRV_NAME);
	if (!memregion) {
		dev_err(&pdev->dev, "Memory region already claimed\n");
		ret = -EBUSY;
		goto err_clk_put;
	}

	regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	if (!regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto err_clk_put;
	}

	spdif->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
					    &tegra20_spdif_regmap_config);
	if (IS_ERR(spdif->regmap)) {
		dev_err(&pdev->dev, "regmap init failed\n");
		ret = PTR_ERR(spdif->regmap);
		goto err_clk_put;
	}

	spdif->playback_dma_data.addr = mem->start + TEGRA20_SPDIF_DATA_OUT;
	spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	spdif->playback_dma_data.maxburst = 4;
	spdif->playback_dma_data.slave_id = dmareq->start;

	pm_runtime_enable(&pdev->dev);
	if (!pm_runtime_enabled(&pdev->dev)) {
		ret = tegra20_spdif_runtime_resume(&pdev->dev);
		if (ret)
			goto err_pm_disable;
	}

	ret = snd_soc_register_component(&pdev->dev, &tegra20_spdif_component,
				   &tegra20_spdif_dai, 1);
	if (ret) {
		dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
		ret = -ENOMEM;
		goto err_suspend;
	}

	ret = tegra_pcm_platform_register(&pdev->dev);
	if (ret) {
		dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
		goto err_unregister_component;
	}

	return 0;

err_unregister_component:
	snd_soc_unregister_component(&pdev->dev);
err_suspend:
	if (!pm_runtime_status_suspended(&pdev->dev))
		tegra20_spdif_runtime_suspend(&pdev->dev);
err_pm_disable:
	pm_runtime_disable(&pdev->dev);
err_clk_put:
	clk_put(spdif->clk_spdif_out);
err:
	return ret;
}

static int tegra20_spdif_platform_remove(struct platform_device *pdev)
{
	struct tegra20_spdif *spdif = dev_get_drvdata(&pdev->dev);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev))
		tegra20_spdif_runtime_suspend(&pdev->dev);

	tegra_pcm_platform_unregister(&pdev->dev);
	snd_soc_unregister_component(&pdev->dev);

	clk_put(spdif->clk_spdif_out);

	return 0;
}

static const struct dev_pm_ops tegra20_spdif_pm_ops = {
	SET_RUNTIME_PM_OPS(tegra20_spdif_runtime_suspend,
			   tegra20_spdif_runtime_resume, NULL)
};

static struct platform_driver tegra20_spdif_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
		.pm = &tegra20_spdif_pm_ops,
	},
	.probe = tegra20_spdif_platform_probe,
	.remove = tegra20_spdif_platform_remove,
};

module_platform_driver(tegra20_spdif_driver);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra20 SPDIF ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);