summaryrefslogtreecommitdiffstats
path: root/sound/soc/tegra/tegra_spdif.c
blob: ea9c92036aa1cad63aaf4fda121e5f70ed4c37d9 (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
/*
 * tegra_spdif.c - Tegra SPDIF driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2011 - 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/module.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <mach/iomap.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "tegra_spdif.h"

#define DRV_NAME "tegra-spdif"

static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg,
					u32 val)
{
	__raw_writel(val, spdif->regs + reg);
}

static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg)
{
	return __raw_readl(spdif->regs + reg);
}

#ifdef CONFIG_DEBUG_FS
static int tegra_spdif_show(struct seq_file *s, void *unused)
{
#define REG(r) { r, #r }
	static const struct {
		int offset;
		const char *name;
	} regs[] = {
		REG(TEGRA_SPDIF_CTRL),
		REG(TEGRA_SPDIF_STATUS),
		REG(TEGRA_SPDIF_STROBE_CTRL),
		REG(TEGRA_SPDIF_DATA_FIFO_CSR),
		REG(TEGRA_SPDIF_CH_STA_RX_A),
		REG(TEGRA_SPDIF_CH_STA_RX_B),
		REG(TEGRA_SPDIF_CH_STA_RX_C),
		REG(TEGRA_SPDIF_CH_STA_RX_D),
		REG(TEGRA_SPDIF_CH_STA_RX_E),
		REG(TEGRA_SPDIF_CH_STA_RX_F),
		REG(TEGRA_SPDIF_CH_STA_TX_A),
		REG(TEGRA_SPDIF_CH_STA_TX_B),
		REG(TEGRA_SPDIF_CH_STA_TX_C),
		REG(TEGRA_SPDIF_CH_STA_TX_D),
		REG(TEGRA_SPDIF_CH_STA_TX_E),
		REG(TEGRA_SPDIF_CH_STA_TX_F),
	};
#undef REG

	struct tegra_spdif *spdif = s->private;
	int i;

	for (i = 0; i < ARRAY_SIZE(regs); i++) {
		u32 val = tegra_spdif_read(spdif, regs[i].offset);
		seq_printf(s, "%s = %08x\n", regs[i].name, val);
	}

	return 0;
}

static int tegra_spdif_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, tegra_spdif_show, inode->i_private);
}

static const struct file_operations tegra_spdif_debug_fops = {
	.open    = tegra_spdif_debug_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = single_release,
};

static void tegra_spdif_debug_add(struct tegra_spdif *spdif)
{
	spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
						snd_soc_debugfs_root, spdif,
						&tegra_spdif_debug_fops);
}

static void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
{
	if (spdif->debug)
		debugfs_remove(spdif->debug);
}
#else
static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif)
{
}

static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
{
}
#endif

static int tegra_spdif_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct device *dev = substream->pcm->card->dev;
	struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
	int ret, spdifclock;

	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK;
	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_PACK;
		spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT;
		break;
	default:
		return -EINVAL;
	}

	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 tegra_spdif_start_playback(struct tegra_spdif *spdif)
{
	spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_TX_EN;
	tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
}

static void tegra_spdif_stop_playback(struct tegra_spdif *spdif)
{
	spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN;
	tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
}

static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
				struct snd_soc_dai *dai)
{
	struct tegra_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:
		if (!spdif->clk_refs)
			clk_enable(spdif->clk_spdif_out);
		spdif->clk_refs++;
		tegra_spdif_start_playback(spdif);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		tegra_spdif_stop_playback(spdif);
		spdif->clk_refs--;
		if (!spdif->clk_refs)
			clk_disable(spdif->clk_spdif_out);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int tegra_spdif_probe(struct snd_soc_dai *dai)
{
	struct tegra_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 tegra_spdif_dai_ops = {
	.hw_params	= tegra_spdif_hw_params,
	.trigger	= tegra_spdif_trigger,
};

static struct snd_soc_dai_driver tegra_spdif_dai = {
	.name = DRV_NAME,
	.probe = tegra_spdif_probe,
	.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 = &tegra_spdif_dai_ops,
};

static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev)
{
	struct tegra_spdif *spdif;
	struct resource *mem, *memregion, *dmareq;
	int ret;

	spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL);
	if (!spdif) {
		dev_err(&pdev->dev, "Can't allocate tegra_spdif\n");
		ret = -ENOMEM;
		goto exit;
	}
	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_free;
	}

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

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

	spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT;
	spdif->playback_dma_data.wrap = 4;
	spdif->playback_dma_data.width = 32;
	spdif->playback_dma_data.req_sel = dmareq->start;

	ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai);
	if (ret) {
		dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
		ret = -ENOMEM;
		goto err_unmap;
	}

	tegra_spdif_debug_add(spdif);

	return 0;

err_unmap:
	iounmap(spdif->regs);
err_release:
	release_mem_region(mem->start, resource_size(mem));
err_clk_put:
	clk_put(spdif->clk_spdif_out);
err_free:
	kfree(spdif);
exit:
	return ret;
}

static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev)
{
	struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev);
	struct resource *res;

	snd_soc_unregister_dai(&pdev->dev);

	tegra_spdif_debug_remove(spdif);

	iounmap(spdif->regs);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	clk_put(spdif->clk_spdif_out);

	kfree(spdif);

	return 0;
}

static struct platform_driver tegra_spdif_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
	.probe = tegra_spdif_platform_probe,
	.remove = __devexit_p(tegra_spdif_platform_remove),
};

static int __init snd_tegra_spdif_init(void)
{
	return platform_driver_register(&tegra_spdif_driver);
}
module_init(snd_tegra_spdif_init);

static void __exit snd_tegra_spdif_exit(void)
{
	platform_driver_unregister(&tegra_spdif_driver);
}
module_exit(snd_tegra_spdif_exit);

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