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#include <sound/dmaengine_pcm.h>
 37
 38#include "edma-pcm.h"
 39#include "davinci-i2s.h"
 40
 41#define MOD_REG_BIT(val, mask, set) do { \
 42	if (set) { \
 43		val |= mask; \
 44	} else { \
 45		val &= ~mask; \
 46	} \
 47} while (0)
 48
 49struct davinci_vcif_dev {
 50	struct davinci_vc *davinci_vc;
 51	struct snd_dmaengine_dai_dma_data dma_data[2];
 52	int dma_request[2];
 53};
 54
 55static void davinci_vcif_start(struct snd_pcm_substream *substream)
 56{
 57	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 58	struct davinci_vcif_dev *davinci_vcif_dev =
 59			snd_soc_dai_get_drvdata(rtd->cpu_dai);
 60	struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 61	u32 w;
 62
 63	/* Start the sample generator and enable transmitter/receiver */
 64	w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 65
 66	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 67		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
 68	else
 69		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
 70
 71	writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 72}
 73
 74static void davinci_vcif_stop(struct snd_pcm_substream *substream)
 75{
 76	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 77	struct davinci_vcif_dev *davinci_vcif_dev =
 78			snd_soc_dai_get_drvdata(rtd->cpu_dai);
 79	struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 80	u32 w;
 81
 82	/* Reset transmitter/receiver and sample rate/frame sync generators */
 83	w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 84	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 85		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
 86	else
 87		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
 88
 89	writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 90}
 91
 92static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
 93				  struct snd_pcm_hw_params *params,
 94				  struct snd_soc_dai *dai)
 95{
 96	struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
 97	struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 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		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
117			    DAVINCI_VC_CTRL_RD_UNSIGNED |
118			    DAVINCI_VC_CTRL_WD_BITS_8 |
119			    DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
120		break;
121	case SNDRV_PCM_FORMAT_S8:
122		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
123			    DAVINCI_VC_CTRL_WD_BITS_8, 1);
124
125		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
126			    DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
127		break;
128	case SNDRV_PCM_FORMAT_S16_LE:
129		MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
130			    DAVINCI_VC_CTRL_RD_UNSIGNED |
131			    DAVINCI_VC_CTRL_WD_BITS_8 |
132			    DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
133		break;
134	default:
135		printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
136		return -EINVAL;
137	}
138
139	writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
140
141	return 0;
142}
143
144static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
145				struct snd_soc_dai *dai)
146{
147	int ret = 0;
148
149	switch (cmd) {
150	case SNDRV_PCM_TRIGGER_START:
151	case SNDRV_PCM_TRIGGER_RESUME:
152	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
153		davinci_vcif_start(substream);
154		break;
155	case SNDRV_PCM_TRIGGER_STOP:
156	case SNDRV_PCM_TRIGGER_SUSPEND:
157	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
158		davinci_vcif_stop(substream);
159		break;
160	default:
161		ret = -EINVAL;
162	}
163
164	return ret;
165}
166
167#define DAVINCI_VCIF_RATES	SNDRV_PCM_RATE_8000_48000
168
169static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
170	.trigger	= davinci_vcif_trigger,
171	.hw_params	= davinci_vcif_hw_params,
172};
173
174static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
175{
176	struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
177
178	dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
179	dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
180
181	return 0;
182}
183
184static struct snd_soc_dai_driver davinci_vcif_dai = {
185	.probe = davinci_vcif_dai_probe,
186	.playback = {
187		.channels_min = 1,
188		.channels_max = 2,
189		.rates = DAVINCI_VCIF_RATES,
190		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
191	.capture = {
192		.channels_min = 1,
193		.channels_max = 2,
194		.rates = DAVINCI_VCIF_RATES,
195		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
196	.ops = &davinci_vcif_dai_ops,
197
198};
199
200static const struct snd_soc_component_driver davinci_vcif_component = {
201	.name		= "davinci-vcif",
202};
203
204static int davinci_vcif_probe(struct platform_device *pdev)
205{
206	struct davinci_vc *davinci_vc = pdev->dev.platform_data;
207	struct davinci_vcif_dev *davinci_vcif_dev;
208	int ret;
209
210	davinci_vcif_dev = devm_kzalloc(&pdev->dev,
211					sizeof(struct davinci_vcif_dev),
212					GFP_KERNEL);
213	if (!davinci_vcif_dev) {
214		dev_dbg(&pdev->dev,
215			"could not allocate memory for private data\n");
216		return -ENOMEM;
217	}
218
219	/* DMA tx params */
220	davinci_vcif_dev->davinci_vc = davinci_vc;
221	davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
222				&davinci_vc->davinci_vcif.dma_tx_channel;
223	davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
224				davinci_vc->davinci_vcif.dma_tx_addr;
225
226	/* DMA rx params */
227	davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
228				&davinci_vc->davinci_vcif.dma_rx_channel;
229	davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
230				davinci_vc->davinci_vcif.dma_rx_addr;
231
232	dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
233
234	ret = devm_snd_soc_register_component(&pdev->dev,
235					      &davinci_vcif_component,
236					      &davinci_vcif_dai, 1);
237	if (ret != 0) {
238		dev_err(&pdev->dev, "could not register dai\n");
239		return ret;
240	}
241
242	ret = edma_pcm_platform_register(&pdev->dev);
243	if (ret) {
244		dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
245		return ret;
246	}
247
248	return 0;
249}
250
251static struct platform_driver davinci_vcif_driver = {
252	.probe		= davinci_vcif_probe,
253	.driver		= {
254		.name	= "davinci-vcif",
255	},
256};
257
258module_platform_driver(davinci_vcif_driver);
259
260MODULE_AUTHOR("Miguel Aguilar");
261MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
262MODULE_LICENSE("GPL");