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Linux/sound/soc/davinci/davinci-vcif.c

  1 /*
  2  * ALSA SoC Voice Codec Interface for TI DAVINCI processor
  3  *
  4  * Copyright (C) 2010 Texas Instruments.
  5  *
  6  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 16  * GNU 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 21  */
 22 
 23 #include <linux/init.h>
 24 #include <linux/module.h>
 25 #include <linux/device.h>
 26 #include <linux/delay.h>
 27 #include <linux/slab.h>
 28 #include <linux/io.h>
 29 #include <linux/mfd/davinci_voicecodec.h>
 30 
 31 #include <sound/core.h>
 32 #include <sound/pcm.h>
 33 #include <sound/pcm_params.h>
 34 #include <sound/initval.h>
 35 #include <sound/soc.h>
 36 
 37 #include "davinci-pcm.h"
 38 #include "davinci-i2s.h"
 39 
 40 #define MOD_REG_BIT(val, mask, set) do { \
 41         if (set) { \
 42                 val |= mask; \
 43         } else { \
 44                 val &= ~mask; \
 45         } \
 46 } while (0)
 47 
 48 struct davinci_vcif_dev {
 49         struct davinci_vc *davinci_vc;
 50         struct davinci_pcm_dma_params   dma_params[2];
 51 };
 52 
 53 static void davinci_vcif_start(struct snd_pcm_substream *substream)
 54 {
 55         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 56         struct davinci_vcif_dev *davinci_vcif_dev =
 57                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
 58         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 59         u32 w;
 60 
 61         /* Start the sample generator and enable transmitter/receiver */
 62         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 63 
 64         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 65                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
 66         else
 67                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
 68 
 69         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 70 }
 71 
 72 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
 73 {
 74         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 75         struct davinci_vcif_dev *davinci_vcif_dev =
 76                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
 77         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 78         u32 w;
 79 
 80         /* Reset transmitter/receiver and sample rate/frame sync generators */
 81         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 82         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 83                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
 84         else
 85                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
 86 
 87         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 88 }
 89 
 90 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
 91                                   struct snd_pcm_hw_params *params,
 92                                   struct snd_soc_dai *dai)
 93 {
 94         struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
 95         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 96         struct davinci_pcm_dma_params *dma_params =
 97                         &davinci_vcif_dev->dma_params[substream->stream];
 98         u32 w;
 99 
100         /* Restart the codec before setup */
101         davinci_vcif_stop(substream);
102         davinci_vcif_start(substream);
103 
104         /* General line settings */
105         writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
106 
107         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
108 
109         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
110 
111         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
112 
113         /* Determine xfer data type */
114         switch (params_format(params)) {
115         case SNDRV_PCM_FORMAT_U8:
116                 dma_params->data_type = 0;
117 
118                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
119                             DAVINCI_VC_CTRL_RD_UNSIGNED |
120                             DAVINCI_VC_CTRL_WD_BITS_8 |
121                             DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
122                 break;
123         case SNDRV_PCM_FORMAT_S8:
124                 dma_params->data_type = 1;
125 
126                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
127                             DAVINCI_VC_CTRL_WD_BITS_8, 1);
128 
129                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
130                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
131                 break;
132         case SNDRV_PCM_FORMAT_S16_LE:
133                 dma_params->data_type = 2;
134 
135                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
136                             DAVINCI_VC_CTRL_RD_UNSIGNED |
137                             DAVINCI_VC_CTRL_WD_BITS_8 |
138                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
139                 break;
140         default:
141                 printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
142                 return -EINVAL;
143         }
144 
145         dma_params->acnt  = dma_params->data_type;
146 
147         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
148 
149         return 0;
150 }
151 
152 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
153                                 struct snd_soc_dai *dai)
154 {
155         int ret = 0;
156 
157         switch (cmd) {
158         case SNDRV_PCM_TRIGGER_START:
159         case SNDRV_PCM_TRIGGER_RESUME:
160         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
161                 davinci_vcif_start(substream);
162                 break;
163         case SNDRV_PCM_TRIGGER_STOP:
164         case SNDRV_PCM_TRIGGER_SUSPEND:
165         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
166                 davinci_vcif_stop(substream);
167                 break;
168         default:
169                 ret = -EINVAL;
170         }
171 
172         return ret;
173 }
174 
175 static int davinci_vcif_startup(struct snd_pcm_substream *substream,
176                                 struct snd_soc_dai *dai)
177 {
178         struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
179 
180         snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
181         return 0;
182 }
183 
184 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
185 
186 static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
187         .startup        = davinci_vcif_startup,
188         .trigger        = davinci_vcif_trigger,
189         .hw_params      = davinci_vcif_hw_params,
190 };
191 
192 static struct snd_soc_dai_driver davinci_vcif_dai = {
193         .playback = {
194                 .channels_min = 1,
195                 .channels_max = 2,
196                 .rates = DAVINCI_VCIF_RATES,
197                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
198         .capture = {
199                 .channels_min = 1,
200                 .channels_max = 2,
201                 .rates = DAVINCI_VCIF_RATES,
202                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
203         .ops = &davinci_vcif_dai_ops,
204 
205 };
206 
207 static const struct snd_soc_component_driver davinci_vcif_component = {
208         .name           = "davinci-vcif",
209 };
210 
211 static int davinci_vcif_probe(struct platform_device *pdev)
212 {
213         struct davinci_vc *davinci_vc = pdev->dev.platform_data;
214         struct davinci_vcif_dev *davinci_vcif_dev;
215         int ret;
216 
217         davinci_vcif_dev = devm_kzalloc(&pdev->dev,
218                                         sizeof(struct davinci_vcif_dev),
219                                         GFP_KERNEL);
220         if (!davinci_vcif_dev) {
221                 dev_dbg(&pdev->dev,
222                         "could not allocate memory for private data\n");
223                 return -ENOMEM;
224         }
225 
226         /* DMA tx params */
227         davinci_vcif_dev->davinci_vc = davinci_vc;
228         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
229                                         davinci_vc->davinci_vcif.dma_tx_channel;
230         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
231                                         davinci_vc->davinci_vcif.dma_tx_addr;
232 
233         /* DMA rx params */
234         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
235                                         davinci_vc->davinci_vcif.dma_rx_channel;
236         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
237                                         davinci_vc->davinci_vcif.dma_rx_addr;
238 
239         dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
240 
241         ret = snd_soc_register_component(&pdev->dev, &davinci_vcif_component,
242                                          &davinci_vcif_dai, 1);
243         if (ret != 0) {
244                 dev_err(&pdev->dev, "could not register dai\n");
245                 return ret;
246         }
247 
248         ret = davinci_soc_platform_register(&pdev->dev);
249         if (ret) {
250                 dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
251                 snd_soc_unregister_component(&pdev->dev);
252                 return ret;
253         }
254 
255         return 0;
256 }
257 
258 static int davinci_vcif_remove(struct platform_device *pdev)
259 {
260         snd_soc_unregister_component(&pdev->dev);
261 
262         return 0;
263 }
264 
265 static struct platform_driver davinci_vcif_driver = {
266         .probe          = davinci_vcif_probe,
267         .remove         = davinci_vcif_remove,
268         .driver         = {
269                 .name   = "davinci-vcif",
270                 .owner  = THIS_MODULE,
271         },
272 };
273 
274 module_platform_driver(davinci_vcif_driver);
275 
276 MODULE_AUTHOR("Miguel Aguilar");
277 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
278 MODULE_LICENSE("GPL");
279 

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