This source file includes following definitions.
- pxa2xx_pcm_hw_params
- pxa2xx_pcm_hw_free
- pxa2xx_pcm_trigger
- pxa2xx_pcm_pointer
- pxa2xx_pcm_prepare
- pxa2xx_pcm_open
- pxa2xx_pcm_close
- pxa2xx_pcm_mmap
- pxa2xx_pcm_preallocate_dma_buffer
- pxa2xx_pcm_free_dma_buffers
- pxa2xx_soc_pcm_new
1
2
3 #include <linux/slab.h>
4 #include <linux/module.h>
5 #include <linux/dma-mapping.h>
6 #include <linux/dmaengine.h>
7 #include <linux/dma/pxa-dma.h>
8
9 #include <sound/core.h>
10 #include <sound/pcm.h>
11 #include <sound/pcm_params.h>
12 #include <sound/pxa2xx-lib.h>
13 #include <sound/dmaengine_pcm.h>
14
15 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
16 .info = SNDRV_PCM_INFO_MMAP |
17 SNDRV_PCM_INFO_MMAP_VALID |
18 SNDRV_PCM_INFO_INTERLEAVED |
19 SNDRV_PCM_INFO_PAUSE |
20 SNDRV_PCM_INFO_RESUME,
21 .formats = SNDRV_PCM_FMTBIT_S16_LE |
22 SNDRV_PCM_FMTBIT_S24_LE |
23 SNDRV_PCM_FMTBIT_S32_LE,
24 .period_bytes_min = 32,
25 .period_bytes_max = 8192 - 32,
26 .periods_min = 1,
27 .periods_max = 256,
28 .buffer_bytes_max = 128 * 1024,
29 .fifo_size = 32,
30 };
31
32 int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
33 struct snd_pcm_hw_params *params)
34 {
35 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
36 struct snd_soc_pcm_runtime *rtd = substream->private_data;
37 struct snd_dmaengine_dai_dma_data *dma_params;
38 struct dma_slave_config config;
39 int ret;
40
41 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
42 if (!dma_params)
43 return 0;
44
45 ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
46 if (ret)
47 return ret;
48
49 snd_dmaengine_pcm_set_config_from_dai_data(substream,
50 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
51 &config);
52
53 ret = dmaengine_slave_config(chan, &config);
54 if (ret)
55 return ret;
56
57 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
58
59 return 0;
60 }
61 EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
62
63 int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
64 {
65 snd_pcm_set_runtime_buffer(substream, NULL);
66 return 0;
67 }
68 EXPORT_SYMBOL(pxa2xx_pcm_hw_free);
69
70 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
71 {
72 return snd_dmaengine_pcm_trigger(substream, cmd);
73 }
74 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
75
76 snd_pcm_uframes_t
77 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
78 {
79 return snd_dmaengine_pcm_pointer(substream);
80 }
81 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
82
83 int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
84 {
85 return 0;
86 }
87 EXPORT_SYMBOL(pxa2xx_pcm_prepare);
88
89 int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
90 {
91 struct snd_soc_pcm_runtime *rtd = substream->private_data;
92 struct snd_pcm_runtime *runtime = substream->runtime;
93 struct snd_dmaengine_dai_dma_data *dma_params;
94 int ret;
95
96 runtime->hw = pxa2xx_pcm_hardware;
97
98 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
99 if (!dma_params)
100 return 0;
101
102
103
104
105
106
107 ret = snd_pcm_hw_constraint_step(runtime, 0,
108 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
109 if (ret)
110 return ret;
111
112 ret = snd_pcm_hw_constraint_step(runtime, 0,
113 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
114 if (ret)
115 return ret;
116
117 ret = snd_pcm_hw_constraint_integer(runtime,
118 SNDRV_PCM_HW_PARAM_PERIODS);
119 if (ret < 0)
120 return ret;
121
122 return snd_dmaengine_pcm_open(
123 substream, dma_request_slave_channel(rtd->cpu_dai->dev,
124 dma_params->chan_name));
125 }
126 EXPORT_SYMBOL(pxa2xx_pcm_open);
127
128 int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
129 {
130 return snd_dmaengine_pcm_close_release_chan(substream);
131 }
132 EXPORT_SYMBOL(pxa2xx_pcm_close);
133
134 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
135 struct vm_area_struct *vma)
136 {
137 struct snd_pcm_runtime *runtime = substream->runtime;
138 return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
139 runtime->dma_addr, runtime->dma_bytes);
140 }
141 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
142
143 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
144 {
145 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
146 struct snd_dma_buffer *buf = &substream->dma_buffer;
147 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
148 buf->dev.type = SNDRV_DMA_TYPE_DEV;
149 buf->dev.dev = pcm->card->dev;
150 buf->private_data = NULL;
151 buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
152 if (!buf->area)
153 return -ENOMEM;
154 buf->bytes = size;
155 return 0;
156 }
157 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
158
159 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
160 {
161 struct snd_pcm_substream *substream;
162 struct snd_dma_buffer *buf;
163 int stream;
164
165 for (stream = 0; stream < 2; stream++) {
166 substream = pcm->streams[stream].substream;
167 if (!substream)
168 continue;
169 buf = &substream->dma_buffer;
170 if (!buf->area)
171 continue;
172 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
173 buf->area = NULL;
174 }
175 }
176 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
177
178 int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
179 {
180 struct snd_card *card = rtd->card->snd_card;
181 struct snd_pcm *pcm = rtd->pcm;
182 int ret;
183
184 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
185 if (ret)
186 return ret;
187
188 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
189 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
190 SNDRV_PCM_STREAM_PLAYBACK);
191 if (ret)
192 goto out;
193 }
194
195 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
196 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
197 SNDRV_PCM_STREAM_CAPTURE);
198 if (ret)
199 goto out;
200 }
201 out:
202 return ret;
203 }
204 EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
205
206 const struct snd_pcm_ops pxa2xx_pcm_ops = {
207 .open = pxa2xx_pcm_open,
208 .close = pxa2xx_pcm_close,
209 .ioctl = snd_pcm_lib_ioctl,
210 .hw_params = pxa2xx_pcm_hw_params,
211 .hw_free = pxa2xx_pcm_hw_free,
212 .prepare = pxa2xx_pcm_prepare,
213 .trigger = pxa2xx_pcm_trigger,
214 .pointer = pxa2xx_pcm_pointer,
215 .mmap = pxa2xx_pcm_mmap,
216 };
217 EXPORT_SYMBOL(pxa2xx_pcm_ops);
218
219 MODULE_AUTHOR("Nicolas Pitre");
220 MODULE_DESCRIPTION("Intel PXA2xx sound library");
221 MODULE_LICENSE("GPL");