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 devm_tegra_pcm_platform_register(struct device *dev)
52{
53	return devm_snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
54}
55EXPORT_SYMBOL_GPL(devm_tegra_pcm_platform_register);
56
57int tegra_pcm_platform_register_with_chan_names(struct device *dev,
58				struct snd_dmaengine_pcm_config *config,
59				char *txdmachan, char *rxdmachan)
60{
61	*config = tegra_dmaengine_pcm_config;
62	config->dma_dev = dev->parent;
63	config->chan_names[0] = txdmachan;
64	config->chan_names[1] = rxdmachan;
65
66	return snd_dmaengine_pcm_register(dev, config, 0);
67}
68EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
69
70void tegra_pcm_platform_unregister(struct device *dev)
71{
72	return snd_dmaengine_pcm_unregister(dev);
73}
74EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
75
76int tegra_pcm_open(struct snd_soc_component *component,
77		   struct snd_pcm_substream *substream)
78{
79	struct snd_soc_pcm_runtime *rtd = substream->private_data;
80	struct snd_dmaengine_dai_dma_data *dmap;
81	struct dma_chan *chan;
82	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
83	int ret;
84
85	if (rtd->dai_link->no_pcm)
86		return 0;
87
88	dmap = snd_soc_dai_get_dma_data(cpu_dai, substream);
89
90	/* Set HW params now that initialization is complete */
91	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
92
93	/* Ensure period size is multiple of 8 */
94	ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
95					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
96	if (ret) {
97		dev_err(rtd->dev, "failed to set constraint %d\n", ret);
98		return ret;
99	}
100
101	chan = dma_request_chan(cpu_dai->dev, dmap->chan_name);
102	if (IS_ERR(chan)) {
103		dev_err(cpu_dai->dev,
104			"dmaengine request slave channel failed! (%s)\n",
105			dmap->chan_name);
106		return -ENODEV;
107	}
108
109	ret = snd_dmaengine_pcm_open(substream, chan);
110	if (ret) {
111		dev_err(rtd->dev,
112			"dmaengine pcm open failed with err %d (%s)\n", ret,
113			dmap->chan_name);
114
115		dma_release_channel(chan);
116
117		return ret;
118	}
119
120	/* Set wait time to 500ms by default */
121	substream->wait_time = 500;
122
123	return 0;
124}
125EXPORT_SYMBOL_GPL(tegra_pcm_open);
126
127int tegra_pcm_close(struct snd_soc_component *component,
128		    struct snd_pcm_substream *substream)
129{
130	struct snd_soc_pcm_runtime *rtd = substream->private_data;
131
132	if (rtd->dai_link->no_pcm)
133		return 0;
134
135	snd_dmaengine_pcm_close_release_chan(substream);
136
137	return 0;
138}
139EXPORT_SYMBOL_GPL(tegra_pcm_close);
140
141int tegra_pcm_hw_params(struct snd_soc_component *component,
142			struct snd_pcm_substream *substream,
143			struct snd_pcm_hw_params *params)
144{
145	struct snd_soc_pcm_runtime *rtd = substream->private_data;
146	struct snd_dmaengine_dai_dma_data *dmap;
147	struct dma_slave_config slave_config;
148	struct dma_chan *chan;
149	int ret;
150
151	if (rtd->dai_link->no_pcm)
152		return 0;
153
154	dmap = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
155	if (!dmap)
156		return 0;
157
158	chan = snd_dmaengine_pcm_get_chan(substream);
159
160	ret = snd_hwparams_to_dma_slave_config(substream, params,
161					       &slave_config);
162	if (ret) {
163		dev_err(rtd->dev, "hw params config failed with err %d\n", ret);
164		return ret;
165	}
166
167	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
168		slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
169		slave_config.dst_addr = dmap->addr;
170		slave_config.dst_maxburst = 8;
171	} else {
172		slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
173		slave_config.src_addr = dmap->addr;
174		slave_config.src_maxburst = 8;
175	}
176
177	ret = dmaengine_slave_config(chan, &slave_config);
178	if (ret < 0) {
179		dev_err(rtd->dev, "dma slave config failed with err %d\n", ret);
180		return ret;
181	}
182
183	return 0;
184}
185EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
186
187snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
188				    struct snd_pcm_substream *substream)
189{
190	return snd_dmaengine_pcm_pointer(substream);
191}
192EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
193
194static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd,
195				  size_t size)
196{
197	struct snd_pcm *pcm = rtd->pcm;
198	int ret;
199
200	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
201	if (ret < 0)
202		return ret;
203
204	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size);
205}
206
207int tegra_pcm_construct(struct snd_soc_component *component,
208			struct snd_soc_pcm_runtime *rtd)
209{
210	struct device *dev = component->dev;
211
212	/*
213	 * Fallback for backwards-compatibility with older device trees that
214	 * have the iommus property in the virtual, top-level "sound" node.
215	 */
216	if (!of_get_property(dev->of_node, "iommus", NULL))
217		dev = rtd->card->snd_card->dev;
218
219	return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max);
220}
221EXPORT_SYMBOL_GPL(tegra_pcm_construct);
222
223MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
224MODULE_DESCRIPTION("Tegra PCM ASoC driver");
225MODULE_LICENSE("GPL");
226