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, config: &tegra_dmaengine_pcm_config, flags: 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, config: &tegra_dmaengine_pcm_config, flags: 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, flags: 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 = snd_soc_substream_to_rtd(substream);
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, hw: &tegra_pcm_hardware);
92
93 /* Ensure period size is multiple of 8 */
94 ret = snd_pcm_hw_constraint_step(runtime: substream->runtime, cond: 0,
95 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, step: 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(dev: cpu_dai->dev, name: dmap->chan_name);
102 if (IS_ERR(ptr: 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 = snd_soc_substream_to_rtd(substream);
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 = snd_soc_substream_to_rtd(substream);
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: &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, config: &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, data: 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_property_present(np: dev->of_node, propname: "iommus"))
217 dev = rtd->card->snd_card->dev;
218
219 return tegra_pcm_dma_allocate(dev, rtd, size: 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

source code of linux/sound/soc/tegra/tegra_pcm.c