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-rw-r--r--sound/soc/tegra/tegra_pcm.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c
new file mode 100644
index 000000000..468c8e77d
--- /dev/null
+++ b/sound/soc/tegra/tegra_pcm.c
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tegra_pcm.c - Tegra PCM driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010,2012 - NVIDIA, Inc.
+ *
+ * Based on code copyright/by:
+ *
+ * Copyright (c) 2009-2010, NVIDIA Corporation.
+ * Scott Peterson <speterson@nvidia.com>
+ * Vijay Mali <vmali@nvidia.com>
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Iliyan Malchev <malchev@google.com>
+ */
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+#include "tegra_pcm.h"
+
+static const struct snd_pcm_hardware tegra_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED,
+ .period_bytes_min = 1024,
+ .period_bytes_max = PAGE_SIZE,
+ .periods_min = 2,
+ .periods_max = 8,
+ .buffer_bytes_max = PAGE_SIZE * 8,
+ .fifo_size = 4,
+};
+
+static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
+ .pcm_hardware = &tegra_pcm_hardware,
+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+ .prealloc_buffer_size = PAGE_SIZE * 8,
+};
+
+int tegra_pcm_platform_register(struct device *dev)
+{
+ return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
+
+int devm_tegra_pcm_platform_register(struct device *dev)
+{
+ return devm_snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
+}
+EXPORT_SYMBOL_GPL(devm_tegra_pcm_platform_register);
+
+int tegra_pcm_platform_register_with_chan_names(struct device *dev,
+ struct snd_dmaengine_pcm_config *config,
+ char *txdmachan, char *rxdmachan)
+{
+ *config = tegra_dmaengine_pcm_config;
+ config->dma_dev = dev->parent;
+ config->chan_names[0] = txdmachan;
+ config->chan_names[1] = rxdmachan;
+
+ return snd_dmaengine_pcm_register(dev, config, 0);
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
+
+void tegra_pcm_platform_unregister(struct device *dev)
+{
+ return snd_dmaengine_pcm_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
+
+int tegra_pcm_open(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_dmaengine_dai_dma_data *dmap;
+ struct dma_chan *chan;
+ struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+ int ret;
+
+ if (rtd->dai_link->no_pcm)
+ return 0;
+
+ dmap = snd_soc_dai_get_dma_data(cpu_dai, substream);
+
+ /* Set HW params now that initialization is complete */
+ snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
+
+ /* Ensure period size is multiple of 8 */
+ ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
+ if (ret) {
+ dev_err(rtd->dev, "failed to set constraint %d\n", ret);
+ return ret;
+ }
+
+ chan = dma_request_slave_channel(cpu_dai->dev, dmap->chan_name);
+ if (!chan) {
+ dev_err(cpu_dai->dev,
+ "dmaengine request slave channel failed! (%s)\n",
+ dmap->chan_name);
+ return -ENODEV;
+ }
+
+ ret = snd_dmaengine_pcm_open(substream, chan);
+ if (ret) {
+ dev_err(rtd->dev,
+ "dmaengine pcm open failed with err %d (%s)\n", ret,
+ dmap->chan_name);
+
+ dma_release_channel(chan);
+
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_open);
+
+int tegra_pcm_close(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+ if (rtd->dai_link->no_pcm)
+ return 0;
+
+ snd_dmaengine_pcm_close_release_chan(substream);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_close);
+
+int tegra_pcm_hw_params(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_dmaengine_dai_dma_data *dmap;
+ struct dma_slave_config slave_config;
+ struct dma_chan *chan;
+ int ret;
+
+ if (rtd->dai_link->no_pcm)
+ return 0;
+
+ dmap = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+ if (!dmap)
+ return 0;
+
+ chan = snd_dmaengine_pcm_get_chan(substream);
+
+ ret = snd_hwparams_to_dma_slave_config(substream, params,
+ &slave_config);
+ if (ret) {
+ dev_err(rtd->dev, "hw params config failed with err %d\n", ret);
+ return ret;
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ slave_config.dst_addr = dmap->addr;
+ slave_config.dst_maxburst = 8;
+ } else {
+ slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ slave_config.src_addr = dmap->addr;
+ slave_config.src_maxburst = 8;
+ }
+
+ ret = dmaengine_slave_config(chan, &slave_config);
+ if (ret < 0) {
+ dev_err(rtd->dev, "dma slave config failed with err %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
+
+snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ return snd_dmaengine_pcm_pointer(substream);
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
+
+static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd,
+ size_t size)
+{
+ struct snd_pcm *pcm = rtd->pcm;
+ int ret;
+
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret < 0)
+ return ret;
+
+ return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size);
+}
+
+int tegra_pcm_construct(struct snd_soc_component *component,
+ struct snd_soc_pcm_runtime *rtd)
+{
+ struct device *dev = component->dev;
+
+ /*
+ * Fallback for backwards-compatibility with older device trees that
+ * have the iommus property in the virtual, top-level "sound" node.
+ */
+ if (!of_get_property(dev->of_node, "iommus", NULL))
+ dev = rtd->card->snd_card->dev;
+
+ return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max);
+}
+EXPORT_SYMBOL_GPL(tegra_pcm_construct);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra PCM ASoC driver");
+MODULE_LICENSE("GPL");