1 /*
2 * omap-pcm.c -- ALSA PCM interface for the OMAP SoC
3 *
4 * Copyright (C) 2008 Nokia Corporation
5 *
6 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
7 * Peter Ujfalusi <peter.ujfalusi@ti.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
22 *
23 */
24
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
35 #ifdef CONFIG_ARCH_OMAP1
36 #define pcm_omap1510() cpu_is_omap1510()
37 #else
38 #define pcm_omap1510() 0
39 #endif
40
41 static const struct snd_pcm_hardware omap_pcm_hardware = {
42 .info = SNDRV_PCM_INFO_MMAP |
43 SNDRV_PCM_INFO_MMAP_VALID |
44 SNDRV_PCM_INFO_INTERLEAVED |
45 SNDRV_PCM_INFO_PAUSE |
46 SNDRV_PCM_INFO_RESUME |
47 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
48 .formats = SNDRV_PCM_FMTBIT_S16_LE |
49 SNDRV_PCM_FMTBIT_S32_LE,
50 .period_bytes_min = 32,
51 .period_bytes_max = 64 * 1024,
52 .periods_min = 2,
53 .periods_max = 255,
54 .buffer_bytes_max = 128 * 1024,
55 };
56
57 /* this may get called several times by oss emulation */
58 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
59 struct snd_pcm_hw_params *params)
60 {
61 struct snd_pcm_runtime *runtime = substream->runtime;
62 struct snd_soc_pcm_runtime *rtd = substream->private_data;
63 struct omap_pcm_dma_data *dma_data;
64 struct dma_slave_config config;
65 struct dma_chan *chan;
66 int err = 0;
67
68 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
69
70 /* return if this is a bufferless transfer e.g.
71 * codec <--> BT codec or GSM modem -- lg FIXME */
72 if (!dma_data)
73 return 0;
74
75 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
76 runtime->dma_bytes = params_buffer_bytes(params);
77
78 chan = snd_dmaengine_pcm_get_chan(substream);
79 if (!chan)
80 return -EINVAL;
81
82 /* fills in addr_width and direction */
83 err = snd_hwparams_to_dma_slave_config(substream, params, &config);
84 if (err)
85 return err;
86
87 snd_dmaengine_pcm_set_config_from_dai_data(substream,
88 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
89 &config);
90
91 return dmaengine_slave_config(chan, &config);
92 }
93
94 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
95 {
96 snd_pcm_set_runtime_buffer(substream, NULL);
97 return 0;
98 }
99
100 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
101 {
102 snd_pcm_uframes_t offset;
103
104 if (pcm_omap1510())
105 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
106 else
107 offset = snd_dmaengine_pcm_pointer(substream);
108
109 return offset;
110 }
111
112 static int omap_pcm_open(struct snd_pcm_substream *substream)
113 {
114 struct snd_soc_pcm_runtime *rtd = substream->private_data;
115 struct snd_dmaengine_dai_dma_data *dma_data;
116
117 snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
118
119 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
120
121 return snd_dmaengine_pcm_open_request_chan(substream,
122 omap_dma_filter_fn,
123 dma_data->filter_data);
124 }
125
126 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
127 struct vm_area_struct *vma)
128 {
129 struct snd_pcm_runtime *runtime = substream->runtime;
130
131 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
132 runtime->dma_area,
133 runtime->dma_addr,
134 runtime->dma_bytes);
135 }
136
137 static struct snd_pcm_ops omap_pcm_ops = {
138 .open = omap_pcm_open,
139 .close = snd_dmaengine_pcm_close_release_chan,
140 .ioctl = snd_pcm_lib_ioctl,
141 .hw_params = omap_pcm_hw_params,
142 .hw_free = omap_pcm_hw_free,
143 .trigger = snd_dmaengine_pcm_trigger,
144 .pointer = omap_pcm_pointer,
145 .mmap = omap_pcm_mmap,
146 };
147
148 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
149
150 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
151 int stream)
152 {
153 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
154 struct snd_dma_buffer *buf = &substream->dma_buffer;
155 size_t size = omap_pcm_hardware.buffer_bytes_max;
156
157 buf->dev.type = SNDRV_DMA_TYPE_DEV;
158 buf->dev.dev = pcm->card->dev;
159 buf->private_data = NULL;
160 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
161 &buf->addr, GFP_KERNEL);
162 if (!buf->area)
163 return -ENOMEM;
164
165 buf->bytes = size;
166 return 0;
167 }
168
169 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
170 {
171 struct snd_pcm_substream *substream;
172 struct snd_dma_buffer *buf;
173 int stream;
174
175 for (stream = 0; stream < 2; stream++) {
176 substream = pcm->streams[stream].substream;
177 if (!substream)
178 continue;
179
180 buf = &substream->dma_buffer;
181 if (!buf->area)
182 continue;
183
184 dma_free_writecombine(pcm->card->dev, buf->bytes,
185 buf->area, buf->addr);
186 buf->area = NULL;
187 }
188 }
189
190 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
191 {
192 struct snd_card *card = rtd->card->snd_card;
193 struct snd_pcm *pcm = rtd->pcm;
194 int ret = 0;
195
196 if (!card->dev->dma_mask)
197 card->dev->dma_mask = &omap_pcm_dmamask;
198 if (!card->dev->coherent_dma_mask)
199 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
200
201 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
202 ret = omap_pcm_preallocate_dma_buffer(pcm,
203 SNDRV_PCM_STREAM_PLAYBACK);
204 if (ret)
205 goto out;
206 }
207
208 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
209 ret = omap_pcm_preallocate_dma_buffer(pcm,
210 SNDRV_PCM_STREAM_CAPTURE);
211 if (ret)
212 goto out;
213 }
214
215 out:
216 /* free preallocated buffers in case of error */
217 if (ret)
218 omap_pcm_free_dma_buffers(pcm);
219
220 return ret;
221 }
222
223 static struct snd_soc_platform_driver omap_soc_platform = {
224 .ops = &omap_pcm_ops,
225 .pcm_new = omap_pcm_new,
226 .pcm_free = omap_pcm_free_dma_buffers,
227 };
228
229 static int omap_pcm_probe(struct platform_device *pdev)
230 {
231 return snd_soc_register_platform(&pdev->dev,
232 &omap_soc_platform);
233 }
234
235 static int omap_pcm_remove(struct platform_device *pdev)
236 {
237 snd_soc_unregister_platform(&pdev->dev);
238 return 0;
239 }
240
241 static struct platform_driver omap_pcm_driver = {
242 .driver = {
243 .name = "omap-pcm-audio",
244 .owner = THIS_MODULE,
245 },
246
247 .probe = omap_pcm_probe,
248 .remove = omap_pcm_remove,
249 };
250
251 module_platform_driver(omap_pcm_driver);
252
253 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
254 MODULE_DESCRIPTION("OMAP PCM DMA module");
255 MODULE_LICENSE("GPL");
256 MODULE_ALIAS("platform:omap-pcm-audio");
257
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