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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
85 snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
86
87
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
