ASoC: Add dmaengine PCM helper functions

This patch adds a set of functions which are intended to be used when
implementing a dmaengine based sound PCM driver.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 287 insertions, 0 deletions

diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c
new file mode 100644
index 000000000000..0526cf82b54f
--- /dev/null
+++ b/sound/soc/soc-dmaengine-pcm.c
@@ -0,0 +1,287 @@
+/*
+ *  Copyright (C) 2012, Analog Devices Inc.
+ *      Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ *  Based on:
+ *      imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *      mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
+ *      ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *                    Copyright (C) 2006 Applied Data Systems
+ *
+ *  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.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/dmaengine.h>
+#include <linux/slab.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <sound/dmaengine_pcm.h>
+
+struct dmaengine_pcm_runtime_data {
+        struct dma_chan *dma_chan;
+
+        unsigned int pos;
+
+        void *data;
+};
+
+static inline struct dmaengine_pcm_runtime_data *substream_to_prtd(
+        const struct snd_pcm_substream *substream)
+{
+        return substream->runtime->private_data;
+}
+
+/**
+ * snd_dmaengine_pcm_set_data - Set dmaengine substream private data
+ * @substream: PCM substream
+ * @data: Data to set
+ */
+void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+
+        prtd->data = data;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_data);
+
+/**
+ * snd_dmaengine_pcm_get_data - Get dmaeinge substream private data
+ * @substream: PCM substream
+ *
+ * Returns the data previously set with snd_dmaengine_pcm_set_data
+ */
+void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+
+        return prtd->data;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_data);
+
+struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+
+        return prtd->dma_chan;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan);
+
+/**
+ * snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config
+ * @substream: PCM substream
+ * @params: hw_params
+ * @slave_config: DMA slave config
+ *
+ * This function can be used to initialize a dma_slave_config from a substream
+ * and hw_params in a dmaengine based PCM driver implementation.
+ */
+int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
+        const struct snd_pcm_hw_params *params,
+        struct dma_slave_config *slave_config)
+{
+        enum dma_slave_buswidth buswidth;
+
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S8:
+                buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
+                break;
+        case SNDRV_PCM_FORMAT_S16_LE:
+                buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
+                break;
+        case SNDRV_PCM_FORMAT_S18_3LE:
+        case SNDRV_PCM_FORMAT_S20_3LE:
+        case SNDRV_PCM_FORMAT_S24_LE:
+        case SNDRV_PCM_FORMAT_S32_LE:
+                buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                slave_config->direction = DMA_MEM_TO_DEV;
+                slave_config->dst_addr_width = buswidth;
+        } else {
+                slave_config->direction = DMA_DEV_TO_MEM;
+                slave_config->src_addr_width = buswidth;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
+
+static void dmaengine_pcm_dma_complete(void *arg)
+{
+        struct snd_pcm_substream *substream = arg;
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+
+        prtd->pos += snd_pcm_lib_period_bytes(substream);
+        if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
+                prtd->pos = 0;
+
+        snd_pcm_period_elapsed(substream);
+}
+
+static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+        struct dma_chan *chan = prtd->dma_chan;
+        struct dma_async_tx_descriptor *desc;
+        enum dma_transfer_direction direction;
+
+        direction = snd_pcm_substream_to_dma_direction(substream);
+
+        desc = chan->device->device_prep_dma_cyclic(chan,
+                substream->runtime->dma_addr,
+                snd_pcm_lib_buffer_bytes(substream),
+                snd_pcm_lib_period_bytes(substream), direction);
+
+        if (!desc)
+                return -ENOMEM;
+
+        desc->callback = dmaengine_pcm_dma_complete;
+        desc->callback_param = substream;
+        dmaengine_submit(desc);
+
+        return 0;
+}
+
+/**
+ * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
+ * @substream: PCM substream
+ * @cmd: Trigger command
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function can be used as the PCM trigger callback for dmaengine based PCM
+ * driver implementations.
+ */
+int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+        int ret;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                ret = dmaengine_pcm_prepare_and_submit(substream);
+                if (ret)
+                        return ret;
+                dma_async_issue_pending(prtd->dma_chan);
+                break;
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                dmaengine_resume(prtd->dma_chan);
+                break;
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                dmaengine_pause(prtd->dma_chan);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+                dmaengine_terminate_all(prtd->dma_chan);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
+
+/**
+ * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
+ * @substream: PCM substream
+ *
+ * This function can be used as the PCM pointer callback for dmaengine based PCM
+ * driver implementations.
+ */
+snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+        return bytes_to_frames(substream->runtime, prtd->pos);
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
+
+static int dmaengine_pcm_request_channel(struct dmaengine_pcm_runtime_data *prtd,
+        dma_filter_fn filter_fn, void *filter_data)
+{
+        dma_cap_mask_t mask;
+
+        dma_cap_zero(mask);
+        dma_cap_set(DMA_SLAVE, mask);
+        dma_cap_set(DMA_CYCLIC, mask);
+        prtd->dma_chan = dma_request_channel(mask, filter_fn, filter_data);
+
+        if (!prtd->dma_chan)
+                return -ENXIO;
+
+        return 0;
+}
+
+/**
+ * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
+ * @substream: PCM substream
+ * @filter_fn: Filter function used to request the DMA channel
+ * @filter_data: Data passed to the DMA filter function
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function will request a DMA channel using the passed filter function and
+ * data. The function should usually be called from the pcm open callback.
+ *
+ * Note that this function will use private_data field of the substream's
+ * runtime. So it is not availabe to your pcm driver implementation. If you need
+ * to keep additional data attached to a substream use
+ * snd_dmaeinge_pcm_{set,get}_data.
+ */
+int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
+        dma_filter_fn filter_fn, void *filter_data)
+{
+        struct dmaengine_pcm_runtime_data *prtd;
+        int ret;
+
+        ret = snd_pcm_hw_constraint_integer(substream->runtime,
+                                            SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0)
+                return ret;
+
+        prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+        if (!prtd)
+                return -ENOMEM;
+
+        ret = dmaengine_pcm_request_channel(prtd, filter_fn, filter_data);
+        if (ret < 0) {
+                kfree(prtd);
+                return ret;
+        }
+
+        substream->runtime->private_data = prtd;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
+
+/**
+ * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
+ * @substream: PCM substream
+ */
+int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
+
+        dma_release_channel(prtd->dma_chan);
+        kfree(prtd);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);