1
2
3
4
5
6
7#include <linux/slab.h>
8#include <linux/module.h>
9#include <linux/dma-mapping.h>
10#include <linux/dmaengine.h>
11#include <linux/dma/pxa-dma.h>
12
13#include <sound/core.h>
14#include <sound/pcm.h>
15#include <sound/pcm_params.h>
16#include <sound/pxa2xx-lib.h>
17#include <sound/dmaengine_pcm.h>
18
19#include "pxa2xx-pcm.h"
20
21static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
22 .info = SNDRV_PCM_INFO_MMAP |
23 SNDRV_PCM_INFO_MMAP_VALID |
24 SNDRV_PCM_INFO_INTERLEAVED |
25 SNDRV_PCM_INFO_PAUSE |
26 SNDRV_PCM_INFO_RESUME,
27 .formats = SNDRV_PCM_FMTBIT_S16_LE |
28 SNDRV_PCM_FMTBIT_S24_LE |
29 SNDRV_PCM_FMTBIT_S32_LE,
30 .period_bytes_min = 32,
31 .period_bytes_max = 8192 - 32,
32 .periods_min = 1,
33 .periods_max = 256,
34 .buffer_bytes_max = 128 * 1024,
35 .fifo_size = 32,
36};
37
38int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
39 struct snd_pcm_hw_params *params)
40{
41 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
42 struct snd_soc_pcm_runtime *rtd = substream->private_data;
43 struct snd_dmaengine_dai_dma_data *dma_params;
44 struct dma_slave_config config;
45 int ret;
46
47 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
48 if (!dma_params)
49 return 0;
50
51 ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
52 if (ret)
53 return ret;
54
55 snd_dmaengine_pcm_set_config_from_dai_data(substream,
56 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
57 &config);
58
59 ret = dmaengine_slave_config(chan, &config);
60 if (ret)
61 return ret;
62
63 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
64
65 return 0;
66}
67EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
68
69int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
70{
71 snd_pcm_set_runtime_buffer(substream, NULL);
72 return 0;
73}
74EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
75
76int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
77{
78 return snd_dmaengine_pcm_trigger(substream, cmd);
79}
80EXPORT_SYMBOL(pxa2xx_pcm_trigger);
81
82snd_pcm_uframes_t
83pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
84{
85 return snd_dmaengine_pcm_pointer(substream);
86}
87EXPORT_SYMBOL(pxa2xx_pcm_pointer);
88
89int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
90{
91 return 0;
92}
93EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
94
95int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
96{
97 struct snd_soc_pcm_runtime *rtd = substream->private_data;
98 struct snd_pcm_runtime *runtime = substream->runtime;
99 struct snd_dmaengine_dai_dma_data *dma_params;
100 int ret;
101
102 runtime->hw = pxa2xx_pcm_hardware;
103
104 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
105 if (!dma_params)
106 return 0;
107
108
109
110
111
112
113 ret = snd_pcm_hw_constraint_step(runtime, 0,
114 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
115 if (ret)
116 return ret;
117
118 ret = snd_pcm_hw_constraint_step(runtime, 0,
119 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
120 if (ret)
121 return ret;
122
123 ret = snd_pcm_hw_constraint_integer(runtime,
124 SNDRV_PCM_HW_PARAM_PERIODS);
125 if (ret < 0)
126 return ret;
127
128 return snd_dmaengine_pcm_open_request_chan(substream,
129 pxad_filter_fn,
130 dma_params->filter_data);
131}
132EXPORT_SYMBOL(__pxa2xx_pcm_open);
133
134int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
135{
136 return snd_dmaengine_pcm_close_release_chan(substream);
137}
138EXPORT_SYMBOL(__pxa2xx_pcm_close);
139
140int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
141 struct vm_area_struct *vma)
142{
143 struct snd_pcm_runtime *runtime = substream->runtime;
144 return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
145 runtime->dma_addr, runtime->dma_bytes);
146}
147EXPORT_SYMBOL(pxa2xx_pcm_mmap);
148
149int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
150{
151 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
152 struct snd_dma_buffer *buf = &substream->dma_buffer;
153 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
154 buf->dev.type = SNDRV_DMA_TYPE_DEV;
155 buf->dev.dev = pcm->card->dev;
156 buf->private_data = NULL;
157 buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
158 if (!buf->area)
159 return -ENOMEM;
160 buf->bytes = size;
161 return 0;
162}
163EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
164
165void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
166{
167 struct snd_pcm_substream *substream;
168 struct snd_dma_buffer *buf;
169 int stream;
170
171 for (stream = 0; stream < 2; stream++) {
172 substream = pcm->streams[stream].substream;
173 if (!substream)
174 continue;
175 buf = &substream->dma_buffer;
176 if (!buf->area)
177 continue;
178 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
179 buf->area = NULL;
180 }
181}
182EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
183
184MODULE_AUTHOR("Nicolas Pitre");
185MODULE_DESCRIPTION("Intel PXA2xx sound library");
186MODULE_LICENSE("GPL");
187
