1 files changed, 92 insertions, 0 deletions
diff --git a/sound/soc/ux500/ux500_pcm.c b/sound/soc/ux500/ux500_pcm.c
new file mode 100644
index 0000000000..53b5649cfd
--- /dev/null
+++ b/sound/soc/ux500/ux500_pcm.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2012
+ *
+ * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
+ *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
+ *         for ST-Ericsson.
+ */
+
+#include <asm/page.h>
+
+#include <linux/module.h>
+#include <linux/dma-mapping.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>
+
+#include "ux500_msp_i2s.h"
+#include "ux500_pcm.h"
+
+#define UX500_PLATFORM_PERIODS_BYTES_MIN	128
+#define UX500_PLATFORM_PERIODS_BYTES_MAX	(64 * PAGE_SIZE)
+#define UX500_PLATFORM_PERIODS_MIN		2
+#define UX500_PLATFORM_PERIODS_MAX		48
+#define UX500_PLATFORM_BUFFER_BYTES_MAX		(2048 * PAGE_SIZE)
+
+static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params,
+		struct dma_slave_config *slave_config)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_dmaengine_dai_dma_data *snd_dma_params;
+	dma_addr_t dma_addr;
+	int ret;
+
+	snd_dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+	dma_addr = snd_dma_params->addr;
+
+	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
+	if (ret)
+		return ret;
+
+	slave_config->dst_maxburst = 4;
+	slave_config->src_maxburst = 4;
+
+	slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+	slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		slave_config->dst_addr = dma_addr;
+	else
+		slave_config->src_addr = dma_addr;
+
+	return 0;
+}
+
+static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
+	.prepare_slave_config = ux500_pcm_prepare_slave_config,
+};
+
+int ux500_pcm_register_platform(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = snd_dmaengine_pcm_register(&pdev->dev,
+					 &ux500_dmaengine_of_pcm_config, 0);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"%s: ERROR: Failed to register platform '%s' (%d)!\n",
+			__func__, pdev->name, ret);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
+
+int ux500_pcm_unregister_platform(struct platform_device *pdev)
+{
+	snd_dmaengine_pcm_unregister(&pdev->dev);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
+
+MODULE_AUTHOR("Ola Lilja");
+MODULE_AUTHOR("Roger Nilsson");
+MODULE_DESCRIPTION("ASoC UX500 driver");
+MODULE_LICENSE("GPL v2");