ASoC: Add support for SPEAr ASoC pcm layer.

This patch add support for the SPEAr ASoC pcm layer in ASoC
framework. The pcm layer uses common snd_dmaengine framework.

Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/include/sound/spear_dma.h b/include/sound/spear_dma.h
new file mode 100644 (file)
index 0000000..1b365bf
--- /dev/null
+++ b/include/sound/spear_dma.h
@@ -0,0 +1,35 @@
+/*
+* linux/spear_dma.h
+*
+* Copyright (ST) 2012 Rajeev Kumar (rajeev-dlh.kumar@st.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
+*
+*/
+
+#ifndef SPEAR_DMA_H
+#define SPEAR_DMA_H
+
+#include <linux/dmaengine.h>
+
+struct spear_dma_data {
+       void *data;
+       dma_addr_t addr;
+       u32 max_burst;
+       enum dma_slave_buswidth addr_width;
+       bool (*filter)(struct dma_chan *chan, void *slave);
+};
+
+#endif /* SPEAR_DMA_H */

diff --git a/sound/soc/spear/spear_pcm.c b/sound/soc/spear/spear_pcm.c
new file mode 100644 (file)
index 0000000..97c2cac
--- /dev/null
+++ b/sound/soc/spear/spear_pcm.c
@@ -0,0 +1,214 @@
+/*
+ * ALSA PCM interface for ST SPEAr Processors
+ *
+ * sound/soc/spear/spear_pcm.c
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Rajeev Kumar<rajeev-dlh.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/spear_dma.h>
+
+struct snd_pcm_hardware spear_pcm_hardware = {
+       .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+                SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+                SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
+       .buffer_bytes_max = 16 * 1024, /* max buffer size */
+       .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
+       .period_bytes_max = 2 * 1024, /* maximum period size */
+       .periods_min = 1, /* min # periods */
+       .periods_max = 8, /* max # of periods */
+       .fifo_size = 0, /* fifo size in bytes */
+};
+
+static int spear_pcm_hw_params(struct snd_pcm_substream *substream,
+               struct snd_pcm_hw_params *params)
+{
+       snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+       return 0;
+}
+
+static int spear_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+       snd_pcm_set_runtime_buffer(substream, NULL);
+
+       return 0;
+}
+
+static int spear_pcm_open(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+       struct spear_dma_data *dma_data = (struct spear_dma_data *)
+               snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+       int ret;
+
+       ret = snd_soc_set_runtime_hwparams(substream, &spear_pcm_hardware);
+       if (ret)
+               return ret;
+
+       ret = snd_dmaengine_pcm_open(substream, dma_data->filter, dma_data);
+       if (ret)
+               return ret;
+
+       snd_dmaengine_pcm_set_data(substream, dma_data);
+
+       return 0;
+}
+
+static int spear_pcm_close(struct snd_pcm_substream *substream)
+{
+
+       snd_dmaengine_pcm_close(substream);
+
+       return 0;
+}
+
+static int spear_pcm_mmap(struct snd_pcm_substream *substream,
+               struct vm_area_struct *vma)
+{
+       struct snd_pcm_runtime *runtime = substream->runtime;
+
+       return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+                       runtime->dma_area, runtime->dma_addr,
+                       runtime->dma_bytes);
+}
+
+static struct snd_pcm_ops spear_pcm_ops = {
+       .open           = spear_pcm_open,
+       .close          = spear_pcm_close,
+       .ioctl          = snd_pcm_lib_ioctl,
+       .hw_params      = spear_pcm_hw_params,
+       .hw_free        = spear_pcm_hw_free,
+       .trigger        = snd_dmaengine_pcm_trigger,
+       .pointer        = snd_dmaengine_pcm_pointer,
+       .mmap           = spear_pcm_mmap,
+};
+
+static int
+spear_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
+               size_t size)
+{
+       struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+       struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+       buf->dev.type = SNDRV_DMA_TYPE_DEV;
+       buf->dev.dev = pcm->card->dev;
+       buf->private_data = NULL;
+
+       buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+                       &buf->addr, GFP_KERNEL);
+       if (!buf->area)
+               return -ENOMEM;
+
+       dev_info(buf->dev.dev,
+                       " preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
+                       (void *)buf->area, (void *)buf->addr, size);
+
+       buf->bytes = size;
+       return 0;
+}
+
+static void spear_pcm_free(struct snd_pcm *pcm)
+{
+       struct snd_pcm_substream *substream;
+       struct snd_dma_buffer *buf;
+       int stream;
+
+       for (stream = 0; stream < 2; stream++) {
+               substream = pcm->streams[stream].substream;
+               if (!substream)
+                       continue;
+
+               buf = &substream->dma_buffer;
+               if (!buf && !buf->area)
+                       continue;
+
+               dma_free_writecombine(pcm->card->dev, buf->bytes,
+                               buf->area, buf->addr);
+               buf->area = NULL;
+       }
+}
+
+static u64 spear_pcm_dmamask = DMA_BIT_MASK(32);
+
+static int spear_pcm_new(struct snd_card *card,
+               struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+       int ret;
+
+       if (!card->dev->dma_mask)
+               card->dev->dma_mask = &spear_pcm_dmamask;
+       if (!card->dev->coherent_dma_mask)
+               card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+       if (dai->driver->playback.channels_min) {
+               ret = spear_pcm_preallocate_dma_buffer(pcm,
+                               SNDRV_PCM_STREAM_PLAYBACK,
+                               spear_pcm_hardware.buffer_bytes_max);
+               if (ret)
+                       return ret;
+       }
+
+       if (dai->driver->capture.channels_min) {
+               ret = spear_pcm_preallocate_dma_buffer(pcm,
+                               SNDRV_PCM_STREAM_CAPTURE,
+                               spear_pcm_hardware.buffer_bytes_max);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+struct snd_soc_platform_driver spear_soc_platform = {
+       .ops            =       &spear_pcm_ops,
+       .pcm_new        =       spear_pcm_new,
+       .pcm_free       =       spear_pcm_free,
+};
+
+static int __devinit spear_soc_platform_probe(struct platform_device *pdev)
+{
+       return snd_soc_register_platform(&pdev->dev, &spear_soc_platform);
+}
+
+static int __devexit spear_soc_platform_remove(struct platform_device *pdev)
+{
+       snd_soc_unregister_platform(&pdev->dev);
+
+       return 0;
+}
+
+static struct platform_driver spear_pcm_driver = {
+       .driver = {
+               .name = "spear-pcm-audio",
+               .owner = THIS_MODULE,
+       },
+
+       .probe = spear_soc_platform_probe,
+       .remove = __devexit_p(spear_soc_platform_remove),
+};
+
+module_platform_driver(spear_pcm_driver);
+
+MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
+MODULE_DESCRIPTION("SPEAr PCM DMA module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:spear-pcm-audio");