[PATCH v9 08/10] ASoC: qcom: Add lpass CPU driver for codec dma control

[Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>]

Add lpass cpu driver to support audio over codec dma for
ADSP bypass usecase.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Co-developed-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Signed-off-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 sound/soc/qcom/lpass-cdc-dma.c | 275 +++++++++++++++++++++++++++++++++++++++++
 sound/soc/qcom/lpass.h         |   1 +
 2 files changed, 276 insertions(+)
 create mode 100644 sound/soc/qcom/lpass-cdc-dma.c

diff --git a/sound/soc/qcom/lpass-cdc-dma.c b/sound/soc/qcom/lpass-cdc-dma.c
new file mode 100644
index 0000000..51cd7ea
--- /dev/null
+++ b/sound/soc/qcom/lpass-cdc-dma.c
@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 The Linux Foundation. All rights reserved.
+ *
+ * lpass-cdc-dma.c -- ALSA SoC CDC DMA CPU DAI driver for QTi LPASS
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "lpass-lpaif-reg.h"
+#include "lpass.h"
+
+enum codec_dma_interfaces {
+	LPASS_CDC_DMA_INTERFACE1 = 1,
+	LPASS_CDC_DMA_INTERFACE2,
+	LPASS_CDC_DMA_INTERFACE3,
+	LPASS_CDC_DMA_INTERFACE4,
+	LPASS_CDC_DMA_INTERFACE5,
+	LPASS_CDC_DMA_INTERFACE6,
+	LPASS_CDC_DMA_INTERFACE7,
+	LPASS_CDC_DMA_INTERFACE8,
+	LPASS_CDC_DMA_INTERFACE9,
+	LPASS_CDC_DMA_INTERFACE10,
+};
+
+static void __lpass_get_dmactl_handle(struct snd_pcm_substream *substream, struct snd_soc_dai *dai,
+				      struct lpaif_dmactl **dmactl, int *id)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0);
+	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
+	struct snd_pcm_runtime *rt = substream->runtime;
+	struct lpass_pcm_data *pcm_data = rt->private_data;
+	struct lpass_variant *v = drvdata->variant;
+	unsigned int dai_id = cpu_dai->driver->id;
+
+	switch (dai_id) {
+	case LPASS_CDC_DMA_RX0 ... LPASS_CDC_DMA_RX9:
+		*dmactl = drvdata->rxtx_rd_dmactl;
+		*id = pcm_data->dma_ch;
+		break;
+	case LPASS_CDC_DMA_TX0 ... LPASS_CDC_DMA_TX8:
+		*dmactl = drvdata->rxtx_wr_dmactl;
+		*id = pcm_data->dma_ch - v->rxtx_wrdma_channel_start;
+		break;
+	case LPASS_CDC_DMA_VA_TX0 ... LPASS_CDC_DMA_VA_TX8:
+		*dmactl = drvdata->va_wr_dmactl;
+		*id = pcm_data->dma_ch - v->va_wrdma_channel_start;
+		break;
+	default:
+		dev_err(soc_runtime->dev, "invalid dai id for dma ctl: %d\n", dai_id);
+		break;
+	}
+}
+
+static int __lpass_get_codec_dma_intf_type(int dai_id)
+{
+	int ret;
+
+	switch (dai_id) {
+	case LPASS_CDC_DMA_RX0:
+	case LPASS_CDC_DMA_TX0:
+	case LPASS_CDC_DMA_VA_TX0:
+		ret = LPASS_CDC_DMA_INTERFACE1;
+		break;
+	case LPASS_CDC_DMA_RX1:
+	case LPASS_CDC_DMA_TX1:
+	case LPASS_CDC_DMA_VA_TX1:
+		ret = LPASS_CDC_DMA_INTERFACE2;
+		break;
+	case LPASS_CDC_DMA_RX2:
+	case LPASS_CDC_DMA_TX2:
+	case LPASS_CDC_DMA_VA_TX2:
+		ret = LPASS_CDC_DMA_INTERFACE3;
+		break;
+	case LPASS_CDC_DMA_RX3:
+	case LPASS_CDC_DMA_TX3:
+	case LPASS_CDC_DMA_VA_TX3:
+		ret = LPASS_CDC_DMA_INTERFACE4;
+		break;
+	case LPASS_CDC_DMA_RX4:
+	case LPASS_CDC_DMA_TX4:
+	case LPASS_CDC_DMA_VA_TX4:
+		ret = LPASS_CDC_DMA_INTERFACE5;
+		break;
+	case LPASS_CDC_DMA_RX5:
+	case LPASS_CDC_DMA_TX5:
+	case LPASS_CDC_DMA_VA_TX5:
+		ret = LPASS_CDC_DMA_INTERFACE6;
+		break;
+	case LPASS_CDC_DMA_RX6:
+	case LPASS_CDC_DMA_TX6:
+	case LPASS_CDC_DMA_VA_TX6:
+		ret = LPASS_CDC_DMA_INTERFACE7;
+		break;
+	case LPASS_CDC_DMA_RX7:
+	case LPASS_CDC_DMA_TX7:
+	case LPASS_CDC_DMA_VA_TX7:
+		ret = LPASS_CDC_DMA_INTERFACE8;
+		break;
+	case LPASS_CDC_DMA_RX8:
+	case LPASS_CDC_DMA_TX8:
+	case LPASS_CDC_DMA_VA_TX8:
+		ret = LPASS_CDC_DMA_INTERFACE9;
+		break;
+	case LPASS_CDC_DMA_RX9:
+		ret  = LPASS_CDC_DMA_INTERFACE10;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int __lpass_platform_codec_intf_init(struct snd_soc_dai *dai,
+					    struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0);
+	struct lpaif_dmactl *dmactl = NULL;
+	struct device *dev = soc_runtime->dev;
+	int ret, id, codec_intf;
+	unsigned int dai_id = cpu_dai->driver->id;
+
+	codec_intf = __lpass_get_codec_dma_intf_type(dai_id);
+	if (codec_intf < 0) {
+		dev_err(dev, "failed to get codec_intf: %d\n", codec_intf);
+		return codec_intf;
+	}
+
+	__lpass_get_dmactl_handle(substream, dai, &dmactl, &id);
+	if (!dmactl) {
+		dev_err(dev, "failed to get dmactl handle for dai_id: %d\n", dai_id);
+		return -EINVAL;
+	}
+
+	ret = regmap_fields_write(dmactl->codec_intf, id, codec_intf);
+	if (ret) {
+		dev_err(dev, "error writing to dmactl codec_intf reg field: %d\n", ret);
+		return ret;
+	}
+	ret = regmap_fields_write(dmactl->codec_fs_sel, id, 0x0);
+	if (ret) {
+		dev_err(dev, "error writing to dmactl codec_fs_sel reg field: %d\n", ret);
+		return ret;
+	}
+	ret = regmap_fields_write(dmactl->codec_fs_delay, id, 0x0);
+	if (ret) {
+		dev_err(dev, "error writing to dmactl codec_fs_delay reg field: %d\n", ret);
+		return ret;
+	}
+	ret = regmap_fields_write(dmactl->codec_pack, id, 0x1);
+	if (ret) {
+		dev_err(dev, "error writing to dmactl codec_pack reg field: %d\n", ret);
+		return ret;
+	}
+	ret = regmap_fields_write(dmactl->codec_enable, id, LPAIF_DMACTL_ENABLE_ON);
+	if (ret) {
+		dev_err(dev, "error writing to dmactl codec_enable reg field: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int lpass_cdc_dma_daiops_startup(struct snd_pcm_substream *substream,
+				    struct snd_soc_dai *dai)
+{
+	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
+
+	return clk_bulk_prepare_enable(drvdata->cdc_num_clks, drvdata->cdc_clks);
+}
+
+static void lpass_cdc_dma_daiops_shutdown(struct snd_pcm_substream *substream,
+				      struct snd_soc_dai *dai)
+{
+	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
+
+	clk_bulk_disable_unprepare(drvdata->cdc_num_clks, drvdata->cdc_clks);
+}
+
+static int lpass_cdc_dma_daiops_hw_params(struct snd_pcm_substream *substream,
+				      struct snd_pcm_hw_params *params,
+				      struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
+	struct lpaif_dmactl *dmactl = NULL;
+	unsigned int ret, regval;
+	unsigned int channels = params_channels(params);
+	int id;
+
+	switch (channels) {
+	case 1:
+		regval = LPASS_CDC_DMA_INTF_ONE_CHANNEL;
+		break;
+	case 2:
+		regval = LPASS_CDC_DMA_INTF_TWO_CHANNEL;
+		break;
+	case 4:
+		regval = LPASS_CDC_DMA_INTF_FOUR_CHANNEL;
+		break;
+	case 6:
+		regval = LPASS_CDC_DMA_INTF_SIX_CHANNEL;
+		break;
+	case 8:
+		regval = LPASS_CDC_DMA_INTF_EIGHT_CHANNEL;
+		break;
+	default:
+		dev_err(soc_runtime->dev, "invalid PCM config\n");
+		return -EINVAL;
+	}
+
+	__lpass_get_dmactl_handle(substream, dai, &dmactl, &id);
+	if (!dmactl) {
+		dev_err(soc_runtime->dev, "failed to get dmactl handle\n");
+		return -EINVAL;
+	}
+	ret = regmap_fields_write(dmactl->codec_channel, id, regval);
+	if (ret) {
+		dev_err(soc_runtime->dev,
+			"error writing to dmactl codec_channel reg field: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int lpass_cdc_dma_daiops_trigger(struct snd_pcm_substream *substream,
+				    int cmd, struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
+	struct lpaif_dmactl *dmactl;
+	int ret = 0, id;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		__lpass_platform_codec_intf_init(dai, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		__lpass_get_dmactl_handle(substream, dai, &dmactl, &id);
+		if (!dmactl) {
+			dev_err(soc_runtime->dev, "failed to get dmactl handle\n");
+			return -EINVAL;
+		}
+		ret = regmap_fields_write(dmactl->codec_enable, id, LPAIF_DMACTL_ENABLE_OFF);
+		if (ret) {
+			dev_err(soc_runtime->dev,
+				"error writing to dmactl codec_enable reg: %d\n", ret);
+			return ret;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+		dev_err(soc_runtime->dev, "%s: invalid %d interface\n", __func__, cmd);
+		break;
+	}
+	return ret;
+}
+
+const struct snd_soc_dai_ops asoc_qcom_lpass_cdc_dma_dai_ops = {
+	.startup	= lpass_cdc_dma_daiops_startup,
+	.shutdown	= lpass_cdc_dma_daiops_shutdown,
+	.hw_params	= lpass_cdc_dma_daiops_hw_params,
+	.trigger	= lpass_cdc_dma_daiops_trigger,
+};
+EXPORT_SYMBOL_GPL(asoc_qcom_lpass_cdc_dma_dai_ops);
+
+MODULE_DESCRIPTION("QTi LPASS CDC DMA Driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/qcom/lpass.h b/sound/soc/qcom/lpass.h
index f756520..3fad471 100644
--- a/sound/soc/qcom/lpass.h
+++ b/sound/soc/qcom/lpass.h
@@ -427,5 +427,6 @@ int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai);
 extern const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops;
 int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
 				struct snd_soc_dai *dai);
+extern const struct snd_soc_dai_ops asoc_qcom_lpass_cdc_dma_dai_ops;
 
 #endif /* __LPASS_H__ */
-- 
2.7.4