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 #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
42 static 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 /* sDMA supports only 1, 2, and 4 byte transfer elements. */
omap_pcm_limit_supported_formats(void)57 static 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 /* this may get called several times by oss emulation */
omap_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)75 static 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 /* return if this is a bufferless transfer e.g.
88 * codec <--> BT codec or GSM modem -- lg FIXME */
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 /* fills in addr_width and direction */
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
omap_pcm_hw_free(struct snd_pcm_substream * substream)111 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
112 {
113 snd_pcm_set_runtime_buffer(substream, NULL);
114 return 0;
115 }
116
omap_pcm_pointer(struct snd_pcm_substream * substream)117 static 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
omap_pcm_open(struct snd_pcm_substream * substream)129 static 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 /* DT boot: filter_data is the DMA name */
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
omap_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)154 static 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_writecombine(substream->pcm->card->dev, vma,
160 runtime->dma_area,
161 runtime->dma_addr,
162 runtime->dma_bytes);
163 }
164
165 static struct snd_pcm_ops omap_pcm_ops = {
166 .open = omap_pcm_open,
167 .close = snd_dmaengine_pcm_close_release_chan,
168 .ioctl = snd_pcm_lib_ioctl,
169 .hw_params = omap_pcm_hw_params,
170 .hw_free = omap_pcm_hw_free,
171 .trigger = snd_dmaengine_pcm_trigger,
172 .pointer = omap_pcm_pointer,
173 .mmap = omap_pcm_mmap,
174 };
175
omap_pcm_preallocate_dma_buffer(struct snd_pcm * pcm,int stream)176 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
177 int stream)
178 {
179 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
180 struct snd_dma_buffer *buf = &substream->dma_buffer;
181 size_t size = omap_pcm_hardware.buffer_bytes_max;
182
183 buf->dev.type = SNDRV_DMA_TYPE_DEV;
184 buf->dev.dev = pcm->card->dev;
185 buf->private_data = NULL;
186 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
187 &buf->addr, GFP_KERNEL);
188 if (!buf->area)
189 return -ENOMEM;
190
191 buf->bytes = size;
192 return 0;
193 }
194
omap_pcm_free_dma_buffers(struct snd_pcm * pcm)195 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
196 {
197 struct snd_pcm_substream *substream;
198 struct snd_dma_buffer *buf;
199 int stream;
200
201 for (stream = 0; stream < 2; stream++) {
202 substream = pcm->streams[stream].substream;
203 if (!substream)
204 continue;
205
206 buf = &substream->dma_buffer;
207 if (!buf->area)
208 continue;
209
210 dma_free_writecombine(pcm->card->dev, buf->bytes,
211 buf->area, buf->addr);
212 buf->area = NULL;
213 }
214 }
215
omap_pcm_new(struct snd_soc_pcm_runtime * rtd)216 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
217 {
218 struct snd_card *card = rtd->card->snd_card;
219 struct snd_pcm *pcm = rtd->pcm;
220 int ret;
221
222 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
223 if (ret)
224 return ret;
225
226 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
227 ret = omap_pcm_preallocate_dma_buffer(pcm,
228 SNDRV_PCM_STREAM_PLAYBACK);
229 if (ret)
230 goto out;
231 }
232
233 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
234 ret = omap_pcm_preallocate_dma_buffer(pcm,
235 SNDRV_PCM_STREAM_CAPTURE);
236 if (ret)
237 goto out;
238 }
239
240 out:
241 /* free preallocated buffers in case of error */
242 if (ret)
243 omap_pcm_free_dma_buffers(pcm);
244
245 return ret;
246 }
247
248 static struct snd_soc_platform_driver omap_soc_platform = {
249 .ops = &omap_pcm_ops,
250 .pcm_new = omap_pcm_new,
251 .pcm_free = omap_pcm_free_dma_buffers,
252 };
253
omap_pcm_platform_register(struct device * dev)254 int omap_pcm_platform_register(struct device *dev)
255 {
256 omap_pcm_limit_supported_formats();
257 return devm_snd_soc_register_platform(dev, &omap_soc_platform);
258 }
259 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
260
261 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
262 MODULE_DESCRIPTION("OMAP PCM DMA module");
263 MODULE_LICENSE("GPL");
264