ASoC: DaVinci: Voice Codec Interface

This patch adds the support for the interface needed by the DaVinci
Voice Codec CQ93VC.

Signed-off-by: Miguel Aguilar <miguel.aguilar@ridgerun.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 272 insertions, 0 deletions

diff --git a/sound/soc/davinci/davinci-vcif.c b/sound/soc/davinci/davinci-vcif.c
new file mode 100644
index 000000000000..03f3feb0fe2f
--- /dev/null
+++ b/sound/soc/davinci/davinci-vcif.c
@@ -0,0 +1,272 @@
+/*
+ * ALSA SoC Voice Codec Interface for TI DAVINCI processor
+ *
+ * Copyright (C) 2010 Texas Instruments.
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/mfd/davinci_voicecodec.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "davinci-pcm.h"
+#include "davinci-i2s.h"
+#include "davinci-vcif.h"
+
+#define MOD_REG_BIT(val, mask, set) do { \
+        if (set) { \
+                val |= mask; \
+        } else { \
+                val &= ~mask; \
+        } \
+} while (0)
+
+struct davinci_vcif_dev {
+        struct davinci_vc *davinci_vc;
+        struct davinci_pcm_dma_params   dma_params[2];
+};
+
+static void davinci_vcif_start(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct davinci_vcif_dev *davinci_vcif_dev =
+                                        rtd->dai->cpu_dai->private_data;
+        struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
+        u32 w;
+
+        /* Start the sample generator and enable transmitter/receiver */
+        w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
+        else
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
+
+        writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
+}
+
+static void davinci_vcif_stop(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct davinci_vcif_dev *davinci_vcif_dev =
+                                        rtd->dai->cpu_dai->private_data;
+        struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
+        u32 w;
+
+        /* Reset transmitter/receiver and sample rate/frame sync generators */
+        w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
+        else
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
+
+        writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
+}
+
+static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
+                                  struct snd_pcm_hw_params *params,
+                                  struct snd_soc_dai *dai)
+{
+        struct davinci_vcif_dev *davinci_vcif_dev = dai->private_data;
+        struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
+        struct davinci_pcm_dma_params *dma_params =
+                        &davinci_vcif_dev->dma_params[substream->stream];
+        u32 w;
+
+        /* Restart the codec before setup */
+        davinci_vcif_stop(substream);
+        davinci_vcif_start(substream);
+
+        /* General line settings */
+        writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
+
+        writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
+
+        writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
+
+        w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
+
+        /* Determine xfer data type */
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_U8:
+                dma_params->data_type = 0;
+
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
+                            DAVINCI_VC_CTRL_RD_UNSIGNED |
+                            DAVINCI_VC_CTRL_WD_BITS_8 |
+                            DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
+                break;
+        case SNDRV_PCM_FORMAT_S8:
+                dma_params->data_type = 1;
+
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
+                            DAVINCI_VC_CTRL_WD_BITS_8, 1);
+
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
+                            DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
+                break;
+        case SNDRV_PCM_FORMAT_S16_LE:
+                dma_params->data_type = 2;
+
+                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
+                            DAVINCI_VC_CTRL_RD_UNSIGNED |
+                            DAVINCI_VC_CTRL_WD_BITS_8 |
+                            DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
+                break;
+        default:
+                printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
+                return -EINVAL;
+        }
+
+        dma_params->acnt  = dma_params->data_type;
+
+        writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
+
+        return 0;
+}
+
+static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
+                                struct snd_soc_dai *dai)
+{
+        int ret = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                davinci_vcif_start(substream);
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                davinci_vcif_stop(substream);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+#define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
+
+static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
+        .trigger        = davinci_vcif_trigger,
+        .hw_params      = davinci_vcif_hw_params,
+};
+
+struct snd_soc_dai davinci_vcif_dai = {
+        .name = "davinci-vcif",
+        .playback = {
+                .channels_min = 1,
+                .channels_max = 2,
+                .rates = DAVINCI_VCIF_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .capture = {
+                .channels_min = 1,
+                .channels_max = 2,
+                .rates = DAVINCI_VCIF_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .ops = &davinci_vcif_dai_ops,
+
+};
+EXPORT_SYMBOL_GPL(davinci_vcif_dai);
+
+static int davinci_vcif_probe(struct platform_device *pdev)
+{
+        struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
+        struct davinci_vcif_dev *davinci_vcif_dev;
+        int ret;
+
+        davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), GFP_KERNEL);
+        if (!davinci_vc) {
+                dev_dbg(&pdev->dev,
+                        "could not allocate memory for private data\n");
+                return -ENOMEM;
+        }
+
+        /* DMA tx params */
+        davinci_vcif_dev->davinci_vc = davinci_vc;
+        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
+                                        davinci_vc->davinci_vcif.dma_tx_channel;
+        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
+                                        davinci_vc->davinci_vcif.dma_tx_addr;
+
+        /* DMA rx params */
+        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
+                                        davinci_vc->davinci_vcif.dma_rx_channel;
+        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
+                                        davinci_vc->davinci_vcif.dma_rx_addr;
+
+        davinci_vcif_dai.dev = &pdev->dev;
+        davinci_vcif_dai.dma_data = davinci_vcif_dev->dma_params;
+        davinci_vcif_dai.private_data = davinci_vcif_dev;
+
+        ret = snd_soc_register_dai(&davinci_vcif_dai);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "could not register dai\n");
+                goto fail;
+        }
+
+        return 0;
+
+fail:
+        kfree(davinci_vcif_dev);
+
+        return ret;
+}
+
+static int davinci_vcif_remove(struct platform_device *pdev)
+{
+        snd_soc_unregister_dai(&davinci_vcif_dai);
+
+        return 0;
+}
+
+static struct platform_driver davinci_vcif_driver = {
+        .probe          = davinci_vcif_probe,
+        .remove         = davinci_vcif_remove,
+        .driver         = {
+                .name   = "davinci_vcif",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init davinci_vcif_init(void)
+{
+        return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
+}
+module_init(davinci_vcif_init);
+
+static void __exit davinci_vcif_exit(void)
+{
+        platform_driver_unregister(&davinci_vcif_driver);
+}
+module_exit(davinci_vcif_exit);
+
+MODULE_AUTHOR("Miguel Aguilar");
+MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
+MODULE_LICENSE("GPL");