1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tegra_pcm.c - Tegra PCM driver
4 *
5 * Author: Stephen Warren <swarren@nvidia.com>
6 * Copyright (C) 2010,2012 - NVIDIA, Inc.
7 *
8 * Based on code copyright/by:
9 *
10 * Copyright (c) 2009-2010, NVIDIA Corporation.
11 * Scott Peterson <speterson@nvidia.com>
12 * Vijay Mali <vmali@nvidia.com>
13 *
14 * Copyright (C) 2010 Google, Inc.
15 * Iliyan Malchev <malchev@google.com>
16 */
17
18#include <linux/module.h>
19#include <linux/dma-mapping.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/soc.h>
24#include <sound/dmaengine_pcm.h>
25#include "tegra_pcm.h"
26
27static const struct snd_pcm_hardware tegra_pcm_hardware = {
28	.info			= SNDRV_PCM_INFO_MMAP |
29				  SNDRV_PCM_INFO_MMAP_VALID |
30				  SNDRV_PCM_INFO_INTERLEAVED,
31	.period_bytes_min	= 1024,
32	.period_bytes_max	= PAGE_SIZE,
33	.periods_min		= 2,
34	.periods_max		= 8,
35	.buffer_bytes_max	= PAGE_SIZE * 8,
36	.fifo_size		= 4,
37};
38
39static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
40	.pcm_hardware = &tegra_pcm_hardware,
41	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
42	.prealloc_buffer_size = PAGE_SIZE * 8,
43};
44
45int tegra_pcm_platform_register(struct device *dev)
46{
47	return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
48}
49EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
50
51int tegra_pcm_platform_register_with_chan_names(struct device *dev,
52				struct snd_dmaengine_pcm_config *config,
53				char *txdmachan, char *rxdmachan)
54{
55	*config = tegra_dmaengine_pcm_config;
56	config->dma_dev = dev->parent;
57	config->chan_names[0] = txdmachan;
58	config->chan_names[1] = rxdmachan;
59
60	return snd_dmaengine_pcm_register(dev, config, 0);
61}
62EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
63
64void tegra_pcm_platform_unregister(struct device *dev)
65{
66	return snd_dmaengine_pcm_unregister(dev);
67}
68EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
69
70int tegra_pcm_open(struct snd_soc_component *component,
71		   struct snd_pcm_substream *substream)
72{
73	struct snd_soc_pcm_runtime *rtd = substream->private_data;
74	struct snd_dmaengine_dai_dma_data *dmap;
75	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,
98			"dmaengine request slave channel failed! (%s)\n",
99			dmap->chan_name);
100		return -ENODEV;
101	}
102
103	ret = snd_dmaengine_pcm_open(substream, chan);
104	if (ret) {
105		dev_err(rtd->dev,
106			"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	}
113
114	return 0;
115}
116EXPORT_SYMBOL_GPL(tegra_pcm_open);
117
118int tegra_pcm_close(struct snd_soc_component *component,
119		    struct snd_pcm_substream *substream)
120{
121	struct snd_soc_pcm_runtime *rtd = substream->private_data;
122
123	if (rtd->dai_link->no_pcm)
124		return 0;
125
126	snd_dmaengine_pcm_close_release_chan(substream);
127
128	return 0;
129}
130EXPORT_SYMBOL_GPL(tegra_pcm_close);
131
132int tegra_pcm_hw_params(struct snd_soc_component *component,
133			struct snd_pcm_substream *substream,
134			struct snd_pcm_hw_params *params)
135{
136	struct snd_soc_pcm_runtime *rtd = substream->private_data;
137	struct snd_dmaengine_dai_dma_data *dmap;
138	struct dma_slave_config slave_config;
139	struct dma_chan *chan;
140	int ret;
141
142	if (rtd->dai_link->no_pcm)
143		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}
178EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
179
180int 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}
192EXPORT_SYMBOL_GPL(tegra_pcm_hw_free);
193
194int 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}
207EXPORT_SYMBOL_GPL(tegra_pcm_mmap);
208
209snd_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}
214EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
215
216static 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
234static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
235{
236	struct snd_pcm_substream *substream;
237	struct snd_dma_buffer *buf;
238
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
251static 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
282err_free_play:
283	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
284err:
285	return ret;
286}
287
288int 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}
293EXPORT_SYMBOL_GPL(tegra_pcm_construct);
294
295void 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}
301EXPORT_SYMBOL_GPL(tegra_pcm_destruct);
302
303MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
304MODULE_DESCRIPTION("Tegra PCM ASoC driver");
305MODULE_LICENSE("GPL");
306