ASoC: SOF: Intel: add hda_dma_prepare/cleanup helpers

SoundWire BPT stream needs to use link and host DMAs. Thus we need
helpers to prepare and cleanup the link and host DMAs. Currently the
SoundWire BPT stream uses hda_cl_prepare/cleanup helpers. It works fine
because we assume the SwoundWire BPT will not run with audio streams
simultaneously. The new helpers are copied from hda_cl_prepare/cleanup
and add a flag to reserve the paired host and link DMAs. The new helpers
will be used by both code loader and SoundWire BPT.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: bardliao

sound/soc/sof/intel/hda-stream.c

@@ -1246,3 +1246,115 @@ u64 hda_dsp_get_stream_ldp(struct snd_sof_dev *sdev,
 	return ((u64)ldp_u << 32) | ldp_l;
 }
 EXPORT_SYMBOL_NS(hda_dsp_get_stream_ldp, "SND_SOC_SOF_INTEL_HDA_COMMON");
+
+struct hdac_ext_stream*
+hda_dma_prepare(struct device *dev, unsigned int format, unsigned int size,
+		struct snd_dma_buffer *dmab, bool persistent_buffer, int direction,
+		bool is_iccmax, bool pair)
+{
+	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+	struct hdac_ext_stream *hext_stream;
+	struct hdac_stream *hstream;
+	int ret;
+
+	if (pair)
+		hext_stream = hda_dsp_stream_pair_get(sdev, direction, 0);
+	else
+		hext_stream = hda_dsp_stream_get(sdev, direction, 0);
+
+	if (!hext_stream) {
+		dev_err(sdev->dev, "error: no stream available\n");
+		return ERR_PTR(-ENODEV);
+	}
+	hstream = &hext_stream->hstream;
+	hstream->substream = NULL;
+
+	/*
+	 * Allocate DMA buffer if it is temporary or if the buffer is intended
+	 * to be persistent but not yet allocated.
+	 * We cannot rely solely on !dmab->area as caller might use a struct on
+	 * stack (when it is temporary) without clearing it to 0.
+	 */
+	if (!persistent_buffer || !dmab->area) {
+		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, dev, size, dmab);
+		if (ret < 0) {
+			dev_err(sdev->dev, "%s: memory alloc failed: %d\n",
+				__func__, ret);
+			goto out_put;
+		}
+	}
+
+	hstream->period_bytes = 0;/* initialize period_bytes */
+	hstream->format_val = format;
+	hstream->bufsize = size;
+
+	if (is_iccmax) {
+		ret = hda_dsp_iccmax_stream_hw_params(sdev, hext_stream, dmab, NULL);
+		if (ret < 0) {
+			dev_err(sdev->dev, "error: iccmax stream prepare failed: %d\n", ret);
+			goto out_free;
+		}
+	} else {
+		ret = hda_dsp_stream_hw_params(sdev, hext_stream, dmab, NULL);
+		if (ret < 0) {
+			dev_err(sdev->dev, "error: hdac prepare failed: %d\n", ret);
+			goto out_free;
+		}
+		hda_dsp_stream_spib_config(sdev, hext_stream, HDA_DSP_SPIB_ENABLE, size);
+	}
+
+	return hext_stream;
+
+out_free:
+	snd_dma_free_pages(dmab);
+	dmab->area = NULL;
+	dmab->bytes = 0;
+	hstream->bufsize = 0;
+	hstream->format_val = 0;
+out_put:
+	hda_dsp_stream_put(sdev, direction, hstream->stream_tag);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_NS(hda_dma_prepare, "SND_SOC_SOF_INTEL_HDA_COMMON");
+
+int hda_dma_cleanup(struct device *dev, struct snd_dma_buffer *dmab,
+		    bool persistent_buffer, struct hdac_ext_stream *hext_stream, bool pair)
+{
+	struct snd_sof_dev *sdev =  dev_get_drvdata(dev);
+	struct hdac_stream *hstream = hdac_stream(hext_stream);
+	int sd_offset = SOF_STREAM_SD_OFFSET(hstream);
+	int ret = 0;
+
+	if (hstream->direction == SNDRV_PCM_STREAM_PLAYBACK)
+		ret = hda_dsp_stream_spib_config(sdev, hext_stream, HDA_DSP_SPIB_DISABLE, 0);
+	else
+		snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, sd_offset,
+					SOF_HDA_SD_CTL_DMA_START, 0);
+
+	if (pair)
+		hda_dsp_stream_pair_put(sdev, hstream->direction, hstream->stream_tag);
+	else
+		hda_dsp_stream_put(sdev, hstream->direction, hstream->stream_tag);
+
+	hstream->running = 0;
+	hstream->substream = NULL;
+
+	/* reset BDL address */
+	snd_sof_dsp_write(sdev, HDA_DSP_HDA_BAR,
+			  sd_offset + SOF_HDA_ADSP_REG_SD_BDLPL, 0);
+	snd_sof_dsp_write(sdev, HDA_DSP_HDA_BAR,
+			  sd_offset + SOF_HDA_ADSP_REG_SD_BDLPU, 0);
+
+	snd_sof_dsp_write(sdev, HDA_DSP_HDA_BAR, sd_offset, 0);
+
+	if (!persistent_buffer) {
+		snd_dma_free_pages(dmab);
+		dmab->area = NULL;
+		dmab->bytes = 0;
+		hstream->bufsize = 0;
+		hstream->format_val = 0;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_NS(hda_dma_cleanup, "SND_SOC_SOF_INTEL_HDA_COMMON");

sound/soc/sof/intel/hda.h

@@ -905,6 +905,14 @@ int sdw_hda_dai_hw_free(struct snd_pcm_substream *substream,
 int sdw_hda_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 			struct snd_soc_dai *cpu_dai);
 
+struct hdac_ext_stream*
+hda_dma_prepare(struct device *dev, unsigned int format, unsigned int size,
+		struct snd_dma_buffer *dmab, bool persistent_buffer, int direction,
+		bool is_iccmax, bool pair);
+
+int hda_dma_cleanup(struct device *dev, struct snd_dma_buffer *dmab,
+		    bool persistent_buffer, struct hdac_ext_stream *hext_stream, bool pair);
+
 /* common dai driver */
 extern struct snd_soc_dai_driver skl_dai[];
 int hda_dsp_dais_suspend(struct snd_sof_dev *sdev);