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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/sound/soc/tegra/tegra_pcm.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * tegra_pcm.c - Tegra PCM driver
34  *
....@@ -12,30 +13,15 @@
1213  *
1314  * Copyright (C) 2010 Google, Inc.
1415  * Iliyan Malchev <malchev@google.com>
15
- *
16
- * This program is free software; you can redistribute it and/or
17
- * modify it under the terms of the GNU General Public License
18
- * version 2 as published by the Free Software Foundation.
19
- *
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- * This program is distributed in the hope that it will be useful, but
21
- * WITHOUT ANY WARRANTY; without even the implied warranty of
22
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
23
- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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- * 02110-1301 USA
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- *
3016  */
3117 
3218 #include <linux/module.h>
19
+#include <linux/dma-mapping.h>
3320 #include <sound/core.h>
3421 #include <sound/pcm.h>
3522 #include <sound/pcm_params.h>
3623 #include <sound/soc.h>
3724 #include <sound/dmaengine_pcm.h>
38
-
3925 #include "tegra_pcm.h"
4026 
4127 static const struct snd_pcm_hardware tegra_pcm_hardware = {
....@@ -81,6 +67,239 @@
8167 }
8268 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
8369 
70
+int tegra_pcm_open(struct snd_soc_component *component,
71
+		   struct snd_pcm_substream *substream)
72
+{
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+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+	struct snd_dmaengine_dai_dma_data *dmap;
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+	struct dma_chan *chan;
76
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
77
+	int ret;
78
+
79
+	if (rtd->dai_link->no_pcm)
80
+		return 0;
81
+
82
+	dmap = snd_soc_dai_get_dma_data(cpu_dai, substream);
83
+
84
+	/* Set HW params now that initialization is complete */
85
+	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
86
+
87
+	/* Ensure period size is multiple of 8 */
88
+	ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
89
+					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
90
+	if (ret) {
91
+		dev_err(rtd->dev, "failed to set constraint %d\n", ret);
92
+		return ret;
93
+	}
94
+
95
+	chan = dma_request_slave_channel(cpu_dai->dev, dmap->chan_name);
96
+	if (!chan) {
97
+		dev_err(cpu_dai->dev,
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+			"dmaengine request slave channel failed! (%s)\n",
99
+			dmap->chan_name);
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+		return -ENODEV;
101
+	}
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+
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+	ret = snd_dmaengine_pcm_open(substream, chan);
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+	if (ret) {
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+		dev_err(rtd->dev,
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+			"dmaengine pcm open failed with err %d (%s)\n", ret,
107
+			dmap->chan_name);
108
+
109
+		dma_release_channel(chan);
110
+
111
+		return ret;
112
+	}
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+
114
+	return 0;
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+}
116
+EXPORT_SYMBOL_GPL(tegra_pcm_open);
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+
118
+int tegra_pcm_close(struct snd_soc_component *component,
119
+		    struct snd_pcm_substream *substream)
120
+{
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+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+
123
+	if (rtd->dai_link->no_pcm)
124
+		return 0;
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+
126
+	snd_dmaengine_pcm_close_release_chan(substream);
127
+
128
+	return 0;
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+}
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+EXPORT_SYMBOL_GPL(tegra_pcm_close);
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+
132
+int tegra_pcm_hw_params(struct snd_soc_component *component,
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+			struct snd_pcm_substream *substream,
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+			struct snd_pcm_hw_params *params)
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+{
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+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+	struct snd_dmaengine_dai_dma_data *dmap;
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+	struct dma_slave_config slave_config;
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+	struct dma_chan *chan;
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+	int ret;
141
+
142
+	if (rtd->dai_link->no_pcm)
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+		return 0;
144
+
145
+	dmap = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
146
+	if (!dmap)
147
+		return 0;
148
+
149
+	chan = snd_dmaengine_pcm_get_chan(substream);
150
+
151
+	ret = snd_hwparams_to_dma_slave_config(substream, params,
152
+					       &slave_config);
153
+	if (ret) {
154
+		dev_err(rtd->dev, "hw params config failed with err %d\n", ret);
155
+		return ret;
156
+	}
157
+
158
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
159
+		slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
160
+		slave_config.dst_addr = dmap->addr;
161
+		slave_config.dst_maxburst = 8;
162
+	} else {
163
+		slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
164
+		slave_config.src_addr = dmap->addr;
165
+		slave_config.src_maxburst = 8;
166
+	}
167
+
168
+	ret = dmaengine_slave_config(chan, &slave_config);
169
+	if (ret < 0) {
170
+		dev_err(rtd->dev, "dma slave config failed with err %d\n", ret);
171
+		return ret;
172
+	}
173
+
174
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
175
+
176
+	return 0;
177
+}
178
+EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
179
+
180
+int tegra_pcm_hw_free(struct snd_soc_component *component,
181
+		      struct snd_pcm_substream *substream)
182
+{
183
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
184
+
185
+	if (rtd->dai_link->no_pcm)
186
+		return 0;
187
+
188
+	snd_pcm_set_runtime_buffer(substream, NULL);
189
+
190
+	return 0;
191
+}
192
+EXPORT_SYMBOL_GPL(tegra_pcm_hw_free);
193
+
194
+int tegra_pcm_mmap(struct snd_soc_component *component,
195
+		   struct snd_pcm_substream *substream,
196
+		   struct vm_area_struct *vma)
197
+{
198
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
199
+	struct snd_pcm_runtime *runtime = substream->runtime;
200
+
201
+	if (rtd->dai_link->no_pcm)
202
+		return 0;
203
+
204
+	return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
205
+			   runtime->dma_addr, runtime->dma_bytes);
206
+}
207
+EXPORT_SYMBOL_GPL(tegra_pcm_mmap);
208
+
209
+snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
210
+				    struct snd_pcm_substream *substream)
211
+{
212
+	return snd_dmaengine_pcm_pointer(substream);
213
+}
214
+EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
215
+
216
+static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
217
+					    size_t size)
218
+{
219
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
220
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
221
+
222
+	buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
223
+	if (!buf->area)
224
+		return -ENOMEM;
225
+
226
+	buf->private_data = NULL;
227
+	buf->dev.type = SNDRV_DMA_TYPE_DEV;
228
+	buf->dev.dev = pcm->card->dev;
229
+	buf->bytes = size;
230
+
231
+	return 0;
232
+}
233
+
234
+static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
235
+{
236
+	struct snd_pcm_substream *substream;
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+	struct snd_dma_buffer *buf;
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+
239
+	substream = pcm->streams[stream].substream;
240
+	if (!substream)
241
+		return;
242
+
243
+	buf = &substream->dma_buffer;
244
+	if (!buf->area)
245
+		return;
246
+
247
+	dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
248
+	buf->area = NULL;
249
+}
250
+
251
+static int tegra_pcm_dma_allocate(struct snd_soc_pcm_runtime *rtd,
252
+				  size_t size)
253
+{
254
+	struct snd_card *card = rtd->card->snd_card;
255
+	struct snd_pcm *pcm = rtd->pcm;
256
+	int ret;
257
+
258
+	ret = dma_set_mask(card->dev, DMA_BIT_MASK(32));
259
+	if (ret < 0)
260
+		return ret;
261
+
262
+	ret = dma_set_coherent_mask(card->dev, DMA_BIT_MASK(32));
263
+	if (ret < 0)
264
+		return ret;
265
+
266
+	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
267
+		ret = tegra_pcm_preallocate_dma_buffer(pcm,
268
+			SNDRV_PCM_STREAM_PLAYBACK, size);
269
+		if (ret)
270
+			goto err;
271
+	}
272
+
273
+	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
274
+		ret = tegra_pcm_preallocate_dma_buffer(pcm,
275
+			SNDRV_PCM_STREAM_CAPTURE, size);
276
+		if (ret)
277
+			goto err_free_play;
278
+	}
279
+
280
+	return 0;
281
+
282
+err_free_play:
283
+	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
284
+err:
285
+	return ret;
286
+}
287
+
288
+int tegra_pcm_construct(struct snd_soc_component *component,
289
+			struct snd_soc_pcm_runtime *rtd)
290
+{
291
+	return tegra_pcm_dma_allocate(rtd, tegra_pcm_hardware.buffer_bytes_max);
292
+}
293
+EXPORT_SYMBOL_GPL(tegra_pcm_construct);
294
+
295
+void tegra_pcm_destruct(struct snd_soc_component *component,
296
+			struct snd_pcm *pcm)
297
+{
298
+	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
299
+	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
300
+}
301
+EXPORT_SYMBOL_GPL(tegra_pcm_destruct);
302
+
84303 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
85304 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
86305 MODULE_LICENSE("GPL");