zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/sound/soc/imx/imx-pcm-dma-mx2.c b/ap/os/linux/linux-3.4.x/sound/soc/imx/imx-pcm-dma-mx2.c
new file mode 100644
index 0000000..6b818de
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/sound/soc/imx/imx-pcm-dma-mx2.c
@@ -0,0 +1,175 @@
+/*
+ * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
+ *
+ * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This code is based on code copyrighted by Freescale,
+ * Liam Girdwood, Javier Martin and probably others.
+ *
+ * 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.
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dmaengine.h>
+#include <linux/types.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include <mach/dma.h>
+
+#include "imx-pcm.h"
+
+static bool filter(struct dma_chan *chan, void *param)
+{
+ if (!imx_dma_is_general_purpose(chan))
+ return false;
+
+ chan->private = param;
+
+ return true;
+}
+
+static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
+ struct imx_pcm_dma_params *dma_params;
+ struct dma_slave_config slave_config;
+ int ret;
+
+ dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+ ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
+ if (ret)
+ return ret;
+
+ slave_config.device_fc = false;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ slave_config.dst_addr = dma_params->dma_addr;
+ slave_config.dst_maxburst = dma_params->burstsize;
+ } else {
+ slave_config.src_addr = dma_params->dma_addr;
+ slave_config.src_maxburst = dma_params->burstsize;
+ }
+
+ ret = dmaengine_slave_config(chan, &slave_config);
+ if (ret)
+ return ret;
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+ return 0;
+}
+
+static struct snd_pcm_hardware snd_imx_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,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .rate_min = 8000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
+ .period_bytes_min = 128,
+ .period_bytes_max = 65535, /* Limited by SDMA engine */
+ .periods_min = 2,
+ .periods_max = 255,
+ .fifo_size = 0,
+};
+
+static int snd_imx_open(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct imx_pcm_dma_params *dma_params;
+ struct imx_dma_data *dma_data;
+ int ret;
+
+ snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
+
+ dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+ dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
+ dma_data->peripheral_type = IMX_DMATYPE_SSI;
+ dma_data->priority = DMA_PRIO_HIGH;
+ dma_data->dma_request = dma_params->dma;
+
+ ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
+ if (ret) {
+ kfree(dma_data);
+ return 0;
+ }
+
+ snd_dmaengine_pcm_set_data(substream, dma_data);
+
+ return 0;
+}
+
+static int snd_imx_close(struct snd_pcm_substream *substream)
+{
+ struct imx_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
+
+ snd_dmaengine_pcm_close(substream);
+ kfree(dma_data);
+
+ return 0;
+}
+
+static struct snd_pcm_ops imx_pcm_ops = {
+ .open = snd_imx_open,
+ .close = snd_imx_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_imx_pcm_hw_params,
+ .trigger = snd_dmaengine_pcm_trigger,
+ .pointer = snd_dmaengine_pcm_pointer,
+ .mmap = snd_imx_pcm_mmap,
+};
+
+static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
+ .ops = &imx_pcm_ops,
+ .pcm_new = imx_pcm_new,
+ .pcm_free = imx_pcm_free,
+};
+
+static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
+{
+ return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
+}
+
+static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver imx_pcm_driver = {
+ .driver = {
+ .name = "imx-pcm-audio",
+ .owner = THIS_MODULE,
+ },
+ .probe = imx_soc_platform_probe,
+ .remove = __devexit_p(imx_soc_platform_remove),
+};
+
+module_platform_driver(imx_pcm_driver);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx-pcm-audio");