--- /dev/null
+/*
+ * Freescale ASRC ALSA SoC Platform (DMA) driver
+ *
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ *
+ * Author: Nicolin Chen <nicoleotsuka@gmail.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/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/platform_data/dma-imx.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+
+#include "fsl_asrc.h"
+
+#define FSL_ASRC_DMABUF_SIZE (256 * 1024)
+
+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,
+ .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
+ .period_bytes_min = 128,
+ .period_bytes_max = 65535, /* Limited by SDMA engine */
+ .periods_min = 2,
+ .periods_max = 255,
+ .fifo_size = 0,
+};
+
+static bool filter(struct dma_chan *chan, void *param)
+{
+ if (!imx_dma_is_general_purpose(chan))
+ return false;
+
+ chan->private = param;
+
+ return true;
+}
+
+static void fsl_asrc_dma_complete(void *arg)
+{
+ struct snd_pcm_substream *substream = arg;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+
+ pair->pos += snd_pcm_lib_period_bytes(substream);
+ if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
+ pair->pos = 0;
+
+ snd_pcm_period_elapsed(substream);
+}
+
+static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream)
+{
+ u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+ struct device *dev = rtd->platform->dev;
+ unsigned long flags = DMA_CTRL_ACK;
+
+ /* Prepare and submit Front-End DMA channel */
+ if (!substream->runtime->no_period_wakeup)
+ flags |= DMA_PREP_INTERRUPT;
+
+ pair->pos = 0;
+ pair->desc[!dir] = dmaengine_prep_dma_cyclic(
+ pair->dma_chan[!dir], runtime->dma_addr,
+ snd_pcm_lib_buffer_bytes(substream),
+ snd_pcm_lib_period_bytes(substream),
+ dir == OUT ? DMA_TO_DEVICE : DMA_FROM_DEVICE, flags);
+ if (!pair->desc[!dir]) {
+ dev_err(dev, "failed to prepare slave DMA for Front-End\n");
+ return -ENOMEM;
+ }
+
+ pair->desc[!dir]->callback = fsl_asrc_dma_complete;
+ pair->desc[!dir]->callback_param = substream;
+
+ dmaengine_submit(pair->desc[!dir]);
+
+ /* Prepare and submit Back-End DMA channel */
+ pair->desc[dir] = dmaengine_prep_dma_cyclic(
+ pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
+ if (!pair->desc[dir]) {
+ dev_err(dev, "failed to prepare slave DMA for Back-End\n");
+ return -ENOMEM;
+ }
+
+ dmaengine_submit(pair->desc[dir]);
+
+ return 0;
+}
+
+static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+ int ret;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ ret = fsl_asrc_dma_prepare_and_submit(substream);
+ if (ret)
+ return ret;
+ dma_async_issue_pending(pair->dma_chan[IN]);
+ dma_async_issue_pending(pair->dma_chan[OUT]);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ dmaengine_terminate_all(pair->dma_chan[OUT]);
+ dmaengine_terminate_all(pair->dma_chan[IN]);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+ struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL;
+ struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+ struct fsl_asrc *asrc_priv = pair->asrc_priv;
+ struct dma_slave_config config_fe, config_be;
+ enum asrc_pair_index index = pair->index;
+ struct device *dev = rtd->platform->dev;
+ int stream = substream->stream;
+ struct imx_dma_data *tmp_data;
+ struct snd_soc_dpcm *dpcm;
+ struct dma_chan *tmp_chan;
+ struct device *dev_be;
+ u8 dir = tx ? OUT : IN;
+ dma_cap_mask_t mask;
+ int ret;
+
+ /* Fetch the Back-End dma_data from DPCM */
+ list_for_each_entry(dpcm, &rtd->dpcm[stream].be_clients, list_be) {
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *substream_be;
+ struct snd_soc_dai *dai = be->cpu_dai;
+
+ if (dpcm->fe != rtd)
+ continue;
+
+ substream_be = snd_soc_dpcm_get_substream(be, stream);
+ dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
+ dev_be = dai->dev;
+ break;
+ }
+
+ if (!dma_params_be) {
+ dev_err(dev, "failed to get the substream of Back-End\n");
+ return -EINVAL;
+ }
+
+ /* Override dma_data of the Front-End and config its dmaengine */
+ dma_params_fe = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
+ dma_params_fe->maxburst = dma_params_be->maxburst;
+
+ pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir);
+ if (!pair->dma_chan[!dir]) {
+ dev_err(dev, "failed to request DMA channel\n");
+ return -EINVAL;
+ }
+
+ memset(&config_fe, 0, sizeof(config_fe));
+ ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
+ if (ret) {
+ dev_err(dev, "failed to prepare DMA config for Front-End\n");
+ return ret;
+ }
+
+ ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
+ if (ret) {
+ dev_err(dev, "failed to config DMA channel for Front-End\n");
+ return ret;
+ }
+
+ /* Request and config DMA channel for Back-End */
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ dma_cap_set(DMA_CYCLIC, mask);
+
+ /* Get DMA request of Back-End */
+ tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
+ tmp_data = tmp_chan->private;
+ pair->dma_data.dma_request = tmp_data->dma_request;
+ dma_release_channel(tmp_chan);
+
+ /* Get DMA request of Front-End */
+ tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
+ tmp_data = tmp_chan->private;
+ pair->dma_data.dma_request2 = tmp_data->dma_request;
+ pair->dma_data.peripheral_type = tmp_data->peripheral_type;
+ pair->dma_data.priority = tmp_data->priority;
+ dma_release_channel(tmp_chan);
+
+ pair->dma_chan[dir] = dma_request_channel(mask, filter, &pair->dma_data);
+ if (!pair->dma_chan[dir]) {
+ dev_err(dev, "failed to request DMA channel for Back-End\n");
+ return -EINVAL;
+ }
+
+ if (asrc_priv->asrc_width == 16)
+ buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ else
+ buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+ config_be.direction = DMA_DEV_TO_DEV;
+ config_be.src_addr_width = buswidth;
+ config_be.src_maxburst = dma_params_be->maxburst;
+ config_be.dst_addr_width = buswidth;
+ config_be.dst_maxburst = dma_params_be->maxburst;
+
+ if (tx) {
+ config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
+ config_be.dst_addr = dma_params_be->addr;
+ } else {
+ config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
+ config_be.src_addr = dma_params_be->addr;
+ }
+
+ ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
+ if (ret) {
+ dev_err(dev, "failed to config DMA channel for Back-End\n");
+ return ret;
+ }
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+ return 0;
+}
+
+static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+
+ snd_pcm_set_runtime_buffer(substream, NULL);
+
+ if (pair->dma_chan[IN])
+ dma_release_channel(pair->dma_chan[IN]);
+
+ if (pair->dma_chan[OUT])
+ dma_release_channel(pair->dma_chan[OUT]);
+
+ pair->dma_chan[IN] = NULL;
+ pair->dma_chan[OUT] = NULL;
+
+ return 0;
+}
+
+static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct device *dev = rtd->platform->dev;
+ struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
+ struct fsl_asrc_pair *pair;
+
+ pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
+ if (!pair) {
+ dev_err(dev, "failed to allocate pair\n");
+ return -ENOMEM;
+ }
+
+ pair->asrc_priv = asrc_priv;
+
+ runtime->private_data = pair;
+
+ snd_pcm_hw_constraint_integer(substream->runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
+
+ return 0;
+}
+
+static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+ struct fsl_asrc *asrc_priv;
+
+ if (!pair)
+ return 0;
+
+ asrc_priv = pair->asrc_priv;
+
+ if (asrc_priv->pair[pair->index] == pair)
+ asrc_priv->pair[pair->index] = NULL;
+
+ kfree(pair);
+
+ return 0;
+}
+
+static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct fsl_asrc_pair *pair = runtime->private_data;
+
+ return bytes_to_frames(substream->runtime, pair->pos);
+}
+
+static struct snd_pcm_ops fsl_asrc_dma_pcm_ops = {
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = fsl_asrc_dma_hw_params,
+ .hw_free = fsl_asrc_dma_hw_free,
+ .trigger = fsl_asrc_dma_trigger,
+ .open = fsl_asrc_dma_startup,
+ .close = fsl_asrc_dma_shutdown,
+ .pointer = fsl_asrc_dma_pcm_pointer,
+};
+
+static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_card *card = rtd->card->snd_card;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm *pcm = rtd->pcm;
+ int ret, i;
+
+ ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(card->dev, "failed to set DMA mask\n");
+ return ret;
+ }
+
+ for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
+ substream = pcm->streams[i].substream;
+ if (!substream)
+ continue;
+
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
+ FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
+ if (ret) {
+ dev_err(card->dev, "failed to allocate DMA buffer\n");
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ if (--i == 0 && pcm->streams[i].substream)
+ snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
+
+ return ret;
+}
+
+static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ int i;
+
+ for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
+ substream = pcm->streams[i].substream;
+ if (!substream)
+ continue;
+
+ snd_dma_free_pages(&substream->dma_buffer);
+ substream->dma_buffer.area = NULL;
+ substream->dma_buffer.addr = 0;
+ }
+}
+
+struct snd_soc_platform_driver fsl_asrc_platform = {
+ .ops = &fsl_asrc_dma_pcm_ops,
+ .pcm_new = fsl_asrc_dma_pcm_new,
+ .pcm_free = fsl_asrc_dma_pcm_free,
+};
+EXPORT_SYMBOL_GPL(fsl_asrc_platform);
Code Review / kvmfornfv.git / blobdiff