ASoC: SOF: Intel: Add legacy IPC support

Add IPC support required for devices introduced before Skylake
(Merrifield, baytrail, CherryTrail, Haswell, Broadwell)

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/intel/intel-ipc.c b/sound/soc/sof/intel/intel-ipc.c
new file mode 100644 (file)
index 0000000..4edd921
--- /dev/null
+++ b/sound/soc/sof/intel/intel-ipc.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license.  When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2019 Intel Corporation. All rights reserved.
+//
+// Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
+
+/* Intel-specific SOF IPC code */
+
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <sound/pcm.h>
+#include <sound/sof/stream.h>
+
+#include "../ops.h"
+#include "../sof-priv.h"
+
+struct intel_stream {
+       size_t posn_offset;
+};
+
+/* Mailbox-based Intel IPC implementation */
+void intel_ipc_msg_data(struct snd_sof_dev *sdev,
+                       struct snd_pcm_substream *substream,
+                       void *p, size_t sz)
+{
+       if (!substream || !sdev->stream_box.size) {
+               sof_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
+       } else {
+               struct intel_stream *stream = substream->runtime->private_data;
+
+               /* The stream might already be closed */
+               if (stream)
+                       sof_mailbox_read(sdev, stream->posn_offset, p, sz);
+       }
+}
+EXPORT_SYMBOL(intel_ipc_msg_data);
+
+int intel_ipc_pcm_params(struct snd_sof_dev *sdev,
+                        struct snd_pcm_substream *substream,
+                        const struct sof_ipc_pcm_params_reply *reply)
+{
+       struct intel_stream *stream = substream->runtime->private_data;
+       size_t posn_offset = reply->posn_offset;
+
+       /* check if offset is overflow or it is not aligned */
+       if (posn_offset > sdev->stream_box.size ||
+           posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
+               return -EINVAL;
+
+       stream->posn_offset = sdev->stream_box.offset + posn_offset;
+
+       dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
+               substream->stream, stream->posn_offset);
+
+       return 0;
+}
+EXPORT_SYMBOL(intel_ipc_pcm_params);
+
+int intel_pcm_open(struct snd_sof_dev *sdev,
+                  struct snd_pcm_substream *substream)
+{
+       struct intel_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
+
+       if (!stream)
+               return -ENOMEM;
+
+       /* binding pcm substream to hda stream */
+       substream->runtime->private_data = stream;
+
+       return 0;
+}
+EXPORT_SYMBOL(intel_pcm_open);
+
+int intel_pcm_close(struct snd_sof_dev *sdev,
+                   struct snd_pcm_substream *substream)
+{
+       struct intel_stream *stream = substream->runtime->private_data;
+
+       substream->runtime->private_data = NULL;
+       kfree(stream);
+
+       return 0;
+}
+EXPORT_SYMBOL(intel_pcm_close);
+
+MODULE_LICENSE("Dual BSD/GPL");