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25#include <linux/dma-mapping.h>
26#include <linux/slab.h>
27#include <linux/module.h>
28#include <linux/omap-dma.h>
29#include <sound/core.h>
30#include <sound/pcm.h>
31#include <sound/pcm_params.h>
32#include <sound/dmaengine_pcm.h>
33#include <sound/soc.h>
34#include <sound/omap-pcm.h>
35
36#ifdef CONFIG_ARCH_OMAP1
37#define pcm_omap1510() cpu_is_omap1510()
38#else
39#define pcm_omap1510() 0
40#endif
41
42static struct snd_pcm_hardware omap_pcm_hardware = {
43 .info = SNDRV_PCM_INFO_MMAP |
44 SNDRV_PCM_INFO_MMAP_VALID |
45 SNDRV_PCM_INFO_INTERLEAVED |
46 SNDRV_PCM_INFO_PAUSE |
47 SNDRV_PCM_INFO_RESUME |
48 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
49 .period_bytes_min = 32,
50 .period_bytes_max = 64 * 1024,
51 .periods_min = 2,
52 .periods_max = 255,
53 .buffer_bytes_max = 128 * 1024,
54};
55
56
57static void omap_pcm_limit_supported_formats(void)
58{
59 int i;
60
61 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
62 switch (snd_pcm_format_physical_width(i)) {
63 case 8:
64 case 16:
65 case 32:
66 omap_pcm_hardware.formats |= (1LL << i);
67 break;
68 default:
69 break;
70 }
71 }
72}
73
74
75static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
76 struct snd_pcm_hw_params *params)
77{
78 struct snd_pcm_runtime *runtime = substream->runtime;
79 struct snd_soc_pcm_runtime *rtd = substream->private_data;
80 struct omap_pcm_dma_data *dma_data;
81 struct dma_slave_config config;
82 struct dma_chan *chan;
83 int err = 0;
84
85 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
86
87
88
89 if (!dma_data)
90 return 0;
91
92 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
93 runtime->dma_bytes = params_buffer_bytes(params);
94
95 chan = snd_dmaengine_pcm_get_chan(substream);
96 if (!chan)
97 return -EINVAL;
98
99
100 err = snd_hwparams_to_dma_slave_config(substream, params, &config);
101 if (err)
102 return err;
103
104 snd_dmaengine_pcm_set_config_from_dai_data(substream,
105 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
106 &config);
107
108 return dmaengine_slave_config(chan, &config);
109}
110
111static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
112{
113 snd_pcm_set_runtime_buffer(substream, NULL);
114 return 0;
115}
116
117static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
118{
119 snd_pcm_uframes_t offset;
120
121 if (pcm_omap1510())
122 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
123 else
124 offset = snd_dmaengine_pcm_pointer(substream);
125
126 return offset;
127}
128
129static int omap_pcm_open(struct snd_pcm_substream *substream)
130{
131 struct snd_soc_pcm_runtime *rtd = substream->private_data;
132 struct snd_dmaengine_dai_dma_data *dma_data;
133 int ret;
134
135 snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
136
137 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
138
139
140 if (rtd->cpu_dai->dev->of_node) {
141 struct dma_chan *chan;
142
143 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
144 dma_data->filter_data);
145 ret = snd_dmaengine_pcm_open(substream, chan);
146 } else {
147 ret = snd_dmaengine_pcm_open_request_chan(substream,
148 omap_dma_filter_fn,
149 dma_data->filter_data);
150 }
151 return ret;
152}
153
154static int omap_pcm_mmap(struct snd_pcm_substream *substream,
155 struct vm_area_struct *vma)
156{
157 struct snd_pcm_runtime *runtime = substream->runtime;
158
159 return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
160 runtime->dma_addr, runtime->dma_bytes);
161}
162
163static struct snd_pcm_ops omap_pcm_ops = {
164 .open = omap_pcm_open,
165 .close = snd_dmaengine_pcm_close_release_chan,
166 .ioctl = snd_pcm_lib_ioctl,
167 .hw_params = omap_pcm_hw_params,
168 .hw_free = omap_pcm_hw_free,
169 .trigger = snd_dmaengine_pcm_trigger,
170 .pointer = omap_pcm_pointer,
171 .mmap = omap_pcm_mmap,
172};
173
174static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
175 int stream)
176{
177 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
178 struct snd_dma_buffer *buf = &substream->dma_buffer;
179 size_t size = omap_pcm_hardware.buffer_bytes_max;
180
181 buf->dev.type = SNDRV_DMA_TYPE_DEV;
182 buf->dev.dev = pcm->card->dev;
183 buf->private_data = NULL;
184 buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
185 if (!buf->area)
186 return -ENOMEM;
187
188 buf->bytes = size;
189 return 0;
190}
191
192static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
193{
194 struct snd_pcm_substream *substream;
195 struct snd_dma_buffer *buf;
196 int stream;
197
198 for (stream = 0; stream < 2; stream++) {
199 substream = pcm->streams[stream].substream;
200 if (!substream)
201 continue;
202
203 buf = &substream->dma_buffer;
204 if (!buf->area)
205 continue;
206
207 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
208 buf->area = NULL;
209 }
210}
211
212static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
213{
214 struct snd_card *card = rtd->card->snd_card;
215 struct snd_pcm *pcm = rtd->pcm;
216 int ret;
217
218 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
219 if (ret)
220 return ret;
221
222 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
223 ret = omap_pcm_preallocate_dma_buffer(pcm,
224 SNDRV_PCM_STREAM_PLAYBACK);
225 if (ret)
226 goto out;
227 }
228
229 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
230 ret = omap_pcm_preallocate_dma_buffer(pcm,
231 SNDRV_PCM_STREAM_CAPTURE);
232 if (ret)
233 goto out;
234 }
235
236out:
237
238 if (ret)
239 omap_pcm_free_dma_buffers(pcm);
240
241 return ret;
242}
243
244static struct snd_soc_platform_driver omap_soc_platform = {
245 .ops = &omap_pcm_ops,
246 .pcm_new = omap_pcm_new,
247 .pcm_free = omap_pcm_free_dma_buffers,
248};
249
250int omap_pcm_platform_register(struct device *dev)
251{
252 omap_pcm_limit_supported_formats();
253 return devm_snd_soc_register_platform(dev, &omap_soc_platform);
254}
255EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
256
257MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
258MODULE_DESCRIPTION("OMAP PCM DMA module");
259MODULE_LICENSE("GPL");
260
