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 memset(&config, 0x00, sizeof(config));
86
87 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
88
89 /* return if this is a bufferless transfer e.g.
90 * codec <--> BT codec or GSM modem -- lg FIXME */
91 if (!dma_data)
92 return 0;
93
94 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
95 runtime->dma_bytes = params_buffer_bytes(params);
96
97 chan = snd_dmaengine_pcm_get_chan(substream);
98 if (!chan)
99 return -EINVAL;
100
101 /* fills in addr_width and direction */
102 err = snd_hwparams_to_dma_slave_config(substream, params, &config);
103 if (err)
104 return err;
105
106 snd_dmaengine_pcm_set_config_from_dai_data(substream,
107 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
108 &config);
109
110 return dmaengine_slave_config(chan, &config);
111 }
112
omap_pcm_hw_free(struct snd_pcm_substream * substream)113 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
114 {
115 snd_pcm_set_runtime_buffer(substream, NULL);
116 return 0;
117 }
118
omap_pcm_pointer(struct snd_pcm_substream * substream)119 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
120 {
121 snd_pcm_uframes_t offset;
122
123 if (pcm_omap1510())
124 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
125 else
126 offset = snd_dmaengine_pcm_pointer(substream);
127
128 return offset;
129 }
130
omap_pcm_open(struct snd_pcm_substream * substream)131 static int omap_pcm_open(struct snd_pcm_substream *substream)
132 {
133 struct snd_soc_pcm_runtime *rtd = substream->private_data;
134 struct snd_dmaengine_dai_dma_data *dma_data;
135 int ret;
136
137 snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
138
139 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
140
141 /* DT boot: filter_data is the DMA name */
142 if (rtd->cpu_dai->dev->of_node) {
143 struct dma_chan *chan;
144
145 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
146 dma_data->filter_data);
147 ret = snd_dmaengine_pcm_open(substream, chan);
148 } else {
149 ret = snd_dmaengine_pcm_open_request_chan(substream,
150 omap_dma_filter_fn,
151 dma_data->filter_data);
152 }
153 return ret;
154 }
155
omap_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)156 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
157 struct vm_area_struct *vma)
158 {
159 struct snd_pcm_runtime *runtime = substream->runtime;
160
161 return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
162 runtime->dma_addr, runtime->dma_bytes);
163 }
164
165 static const 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_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
187 if (!buf->area)
188 return -ENOMEM;
189
190 buf->bytes = size;
191 return 0;
192 }
193
omap_pcm_free_dma_buffers(struct snd_pcm * pcm)194 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
195 {
196 struct snd_pcm_substream *substream;
197 struct snd_dma_buffer *buf;
198 int stream;
199
200 for (stream = 0; stream < 2; stream++) {
201 substream = pcm->streams[stream].substream;
202 if (!substream)
203 continue;
204
205 buf = &substream->dma_buffer;
206 if (!buf->area)
207 continue;
208
209 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
210 buf->area = NULL;
211 }
212 }
213
omap_pcm_new(struct snd_soc_pcm_runtime * rtd)214 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
215 {
216 struct snd_card *card = rtd->card->snd_card;
217 struct snd_pcm *pcm = rtd->pcm;
218 int ret;
219
220 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
221 if (ret)
222 return ret;
223
224 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
225 ret = omap_pcm_preallocate_dma_buffer(pcm,
226 SNDRV_PCM_STREAM_PLAYBACK);
227 if (ret)
228 goto out;
229 }
230
231 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
232 ret = omap_pcm_preallocate_dma_buffer(pcm,
233 SNDRV_PCM_STREAM_CAPTURE);
234 if (ret)
235 goto out;
236 }
237
238 out:
239 /* free preallocated buffers in case of error */
240 if (ret)
241 omap_pcm_free_dma_buffers(pcm);
242
243 return ret;
244 }
245
246 static const struct snd_soc_platform_driver omap_soc_platform = {
247 .ops = &omap_pcm_ops,
248 .pcm_new = omap_pcm_new,
249 .pcm_free = omap_pcm_free_dma_buffers,
250 };
251
omap_pcm_platform_register(struct device * dev)252 int omap_pcm_platform_register(struct device *dev)
253 {
254 omap_pcm_limit_supported_formats();
255 return devm_snd_soc_register_platform(dev, &omap_soc_platform);
256 }
257 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
258
259 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
260 MODULE_DESCRIPTION("OMAP PCM DMA module");
261 MODULE_LICENSE("GPL");
262