[PATCH v2 04/11] ASoC: qcom: Add QAIF CIF (CDC DMA) DAI ops

[Harendra Gautam <harendra.gautam@oss.qualcomm.com>]

Add DAI operations for the QAIF Codec Interface (CIF), which connects the
QAIF DMA engine to the internal Bolero digital codec.

The CIF CDC DMA DAIs need to program the interface configuration for each
allocated RDDMA or WRDMA channel. Without these ops, the driver cannot
configure the active channel mask or enable the interface control bits
required when starting a playback or capture stream.

Initialize the CIF DMA and interface regmap fields, program the active
channel mask from hw_params(), and update the CIF interface controls from
trigger() for stream start, stop, suspend, resume and pause transitions.

Signed-off-by: Harendra Gautam <harendra.gautam@oss.qualcomm.com>
---
 sound/soc/qcom/qaif-cpu.c | 321 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 321 insertions(+)
 create mode 100644 sound/soc/qcom/qaif-cpu.c

diff --git a/sound/soc/qcom/qaif-cpu.c b/sound/soc/qcom/qaif-cpu.c
new file mode 100644
index 000000000000..18df81e3ed9d
--- /dev/null
+++ b/sound/soc/qcom/qaif-cpu.c
@@ -0,0 +1,321 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ *
+ * qaif-cpu.c -- ALSA SoC CPU-Platform DAI driver for QTi QAIF
+ */
+
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+#include "qaif-reg.h"
+#include "qaif.h"
+#include "common.h"
+
+static int qaif_cif_cpu_init_bitfields(struct device *dev,
+				       struct regmap *map)
+{
+	struct qaif_drv_data *drvdata = dev_get_drvdata(dev);
+	const struct qaif_variant *v = drvdata->variant;
+	struct qaif_dmactl *rd_dmactl;
+	struct qaif_dmactl *wr_dmactl;
+	struct qaif_cdc_intfctl *rd_intfctl;
+	struct qaif_cdc_intfctl *wr_intfctl;
+
+	rd_dmactl = devm_kzalloc(dev, sizeof(*rd_dmactl), GFP_KERNEL);
+	if (!rd_dmactl)
+		return -ENOMEM;
+
+	wr_dmactl = devm_kzalloc(dev, sizeof(*wr_dmactl), GFP_KERNEL);
+	if (!wr_dmactl)
+		return -ENOMEM;
+
+	rd_intfctl = devm_kzalloc(dev, sizeof(*rd_intfctl), GFP_KERNEL);
+	if (!rd_intfctl)
+		return -ENOMEM;
+
+	wr_intfctl = devm_kzalloc(dev, sizeof(*wr_intfctl), GFP_KERNEL);
+	if (!wr_intfctl)
+		return -ENOMEM;
+
+	/*
+	 * Bulk-allocate CIF RDDMA dmactl fields.
+	 * Order must match struct qaif_dmactl member order:
+	 * enable, reset, num_ot, dma_dyncclk, burst16, burst8, burst4, burst2, burst1, shram_wm
+	 */
+	{
+		const struct reg_field cif_rd_dmactl_fields[] = {
+			v->cif_rddma_enable,
+			v->cif_rddma_reset,
+			v->cif_rddma_num_ot,
+			v->cif_rddma_dma_dyncclk,
+			v->cif_rddma_burst16,
+			v->cif_rddma_burst8,
+			v->cif_rddma_burst4,
+			v->cif_rddma_burst2,
+			v->cif_rddma_burst1,
+			v->cif_rddma_shram_wm,
+		};
+		int ret = devm_regmap_field_bulk_alloc(dev, map,
+						       &rd_dmactl->enable,
+						       cif_rd_dmactl_fields,
+						       ARRAY_SIZE(cif_rd_dmactl_fields));
+		if (ret) {
+			dev_err(dev, "error allocating CIF RDDMA dmactl regmap fields: %d\n", ret);
+			return ret;
+		}
+	}
+
+	/*
+	 * Bulk-allocate CIF RDDMA intfctl fields.
+	 * Order must match struct qaif_cdc_intfctl member order:
+	 * active_ch_en, fs_sel, fs_delay, fs_out_gate, intf_dyncclk, en_16bit_unpack
+	 */
+	{
+		const struct reg_field cif_rd_intfctl_fields[] = {
+			v->cif_rddma_active_ch_en,
+			v->cif_rddma_fs_sel,
+			v->cif_rddma_fs_delay,
+			v->cif_rddma_fs_out_gate,
+			v->cif_rddma_intf_dyncclk,
+			v->cif_rddma_en_16bit_unpack,
+		};
+		int ret = devm_regmap_field_bulk_alloc(dev, map,
+						       &rd_intfctl->active_ch_en,
+						       cif_rd_intfctl_fields,
+						       ARRAY_SIZE(cif_rd_intfctl_fields));
+		if (ret) {
+			dev_err(dev, "error allocating CIF RDDMA intfctl regmap fields: %d\n", ret);
+			return ret;
+		}
+	}
+
+	/*
+	 * Bulk-allocate CIF WRDMA dmactl fields.
+	 * Order must match struct qaif_dmactl member order:
+	 * enable, reset, num_ot, dma_dyncclk, burst16, burst8, burst4, burst2, burst1, shram_wm
+	 */
+	{
+		const struct reg_field cif_wr_dmactl_fields[] = {
+			v->cif_wrdma_enable,
+			v->cif_wrdma_reset,
+			v->cif_wrdma_num_ot,
+			v->cif_wrdma_dma_dyncclk,
+			v->cif_wrdma_burst16,
+			v->cif_wrdma_burst8,
+			v->cif_wrdma_burst4,
+			v->cif_wrdma_burst2,
+			v->cif_wrdma_burst1,
+			v->cif_wrdma_shram_wm,
+		};
+		int ret = devm_regmap_field_bulk_alloc(dev, map,
+						       &wr_dmactl->enable,
+						       cif_wr_dmactl_fields,
+						       ARRAY_SIZE(cif_wr_dmactl_fields));
+		if (ret) {
+			dev_err(dev, "error allocating CIF WRDMA dmactl regmap fields: %d\n", ret);
+			return ret;
+		}
+	}
+
+	/*
+	 * Bulk-allocate CIF WRDMA intfctl fields.
+	 * Order must match struct qaif_cdc_intfctl member order:
+	 * active_ch_en, fs_sel, fs_delay, fs_out_gate, intf_dyncclk, en_16bit_unpack
+	 */
+	{
+		const struct reg_field cif_wr_intfctl_fields[] = {
+			v->cif_wrdma_active_ch_en,
+			v->cif_wrdma_fs_sel,
+			v->cif_wrdma_fs_delay,
+			v->cif_wrdma_fs_out_gate,
+			v->cif_wrdma_intf_dyncclk,
+			v->cif_wrdma_en_16bit_unpack,
+		};
+		int ret = devm_regmap_field_bulk_alloc(dev, map,
+						       &wr_intfctl->active_ch_en,
+						       cif_wr_intfctl_fields,
+						       ARRAY_SIZE(cif_wr_intfctl_fields));
+		if (ret) {
+			dev_err(dev, "error allocating CIF WRDMA intfctl regmap fields: %d\n", ret);
+			return ret;
+		}
+	}
+
+	drvdata->cif_rd_dmactl = rd_dmactl;
+	drvdata->cif_wr_dmactl = wr_dmactl;
+	drvdata->cif_rddma_intfctl = rd_intfctl;
+	drvdata->cif_wrdma_intfctl = wr_intfctl;
+
+	return 0;
+}
+
+static struct qaif_cdc_intfctl *qaif_get_cif_intfctl_handle(struct snd_pcm_substream *substream,
+							    struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(soc_runtime, 0);
+	struct qaif_drv_data *drvdata = snd_soc_dai_get_drvdata(dai);
+	const struct qaif_variant *v = drvdata->variant;
+	unsigned int dai_id = cpu_dai->driver->id;
+	struct qaif_cdc_intfctl *intfctl = NULL;
+
+	if (!v) {
+		dev_err(soc_runtime->dev, "No variant data\n");
+		return intfctl;
+	}
+
+	switch (dai_id) {
+	case QAIF_CDC_DMA_RX0 ... QAIF_CDC_DMA_RX9:
+		intfctl = drvdata->cif_rddma_intfctl;
+		break;
+	case QAIF_CDC_DMA_TX0 ... QAIF_CDC_DMA_TX9:
+	case QAIF_CDC_DMA_VA_TX0 ... QAIF_CDC_DMA_VA_TX9:
+		intfctl = drvdata->cif_wrdma_intfctl;
+		break;
+	default:
+		dev_err(soc_runtime->dev, "invalid dai id for dma ctl: %d\n", dai_id);
+		break;
+	}
+	return intfctl;
+}
+
+static int qaif_cif_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 = snd_soc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(soc_runtime, 0);
+	struct qaif_drv_data *drvdata = snd_soc_dai_get_drvdata(dai);
+	const struct qaif_variant *v = drvdata->variant;
+	struct qaif_cdc_intfctl *intfctl = NULL;
+	unsigned int dai_id = cpu_dai->driver->id;
+	int ret;
+	unsigned int regval;
+	unsigned int channels = params_channels(params);
+	int idx;
+
+	switch (channels) {
+	case 1:
+		regval = QAIF_CIF_DMA_INTF_ONE_CHANNEL;
+		break;
+	case 2:
+		regval = QAIF_CIF_DMA_INTF_TWO_CHANNEL;
+		break;
+	case 4:
+		regval = QAIF_CIF_DMA_INTF_FOUR_CHANNEL;
+		break;
+	case 6:
+		regval = QAIF_CIF_DMA_INTF_SIX_CHANNEL;
+		break;
+	case 8:
+		regval = QAIF_CIF_DMA_INTF_EIGHT_CHANNEL;
+		break;
+	default:
+		dev_err(soc_runtime->dev, "invalid PCM config\n");
+		return -EINVAL;
+	}
+
+	intfctl = qaif_get_cif_intfctl_handle(substream, dai);
+	if (!intfctl) {
+		dev_err(soc_runtime->dev, "Invalid intfctl: %d\n", dai_id);
+		return -EINVAL;
+	}
+	idx = v->get_dma_idx(dai_id);
+	if (idx < 0) {
+		dev_err(soc_runtime->dev, "Invalid DMA index: %d\n", idx);
+		return -EINVAL;
+	}
+	ret = regmap_fields_write(intfctl->active_ch_en, idx, regval);
+	if (ret) {
+		dev_err(soc_runtime->dev,
+			"error writing to intfctl active_ch_en reg field: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int qaif_cif_daiops_trigger(struct snd_pcm_substream *substream,
+				   int cmd,
+				   struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(soc_runtime, 0);
+	struct qaif_drv_data *drvdata = snd_soc_dai_get_drvdata(dai);
+	const struct qaif_variant *v = drvdata->variant;
+	unsigned int dai_id = cpu_dai->driver->id;
+	struct qaif_cdc_intfctl *intfctl = NULL;
+	int ret = 0, idx;
+
+	intfctl = qaif_get_cif_intfctl_handle(substream, dai);
+	if (!intfctl) {
+		dev_err(soc_runtime->dev, "Invalid intfctl: %d\n", dai_id);
+		return -EINVAL;
+	}
+	idx = v->get_dma_idx(dai_id);
+	if (idx < 0) {
+		dev_err(soc_runtime->dev, "Invalid DMA index: %d\n", idx);
+		return -EINVAL;
+	}
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		ret = regmap_fields_write(intfctl->intf_dyncclk, idx, QAIF_DMACTL_DYNCLK_ON);
+		if (ret) {
+			dev_err(soc_runtime->dev, "error writing intf_dyncclk field: %d\n", ret);
+			return ret;
+		}
+		ret = regmap_fields_write(intfctl->fs_sel, idx, QAIF_CIF_DMA_FS_SEL_DEFAULT);
+		if (ret) {
+			dev_err(soc_runtime->dev, "error writing codec_fs_sel field: %d\n", ret);
+			return ret;
+		}
+
+		ret = regmap_fields_write(intfctl->en_16bit_unpack,
+					  idx,
+					  QAIF_CIF_16BIT_UNPACK_ENABLE);
+		if (ret) {
+			dev_err(soc_runtime->dev, "error writing en_16bit_unpack field: %d\n", ret);
+			return ret;
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		ret = regmap_fields_write(intfctl->intf_dyncclk, idx, QAIF_DMACTL_DYNCLK_OFF);
+		if (ret) {
+			dev_err(soc_runtime->dev, "error writing intf_dyncclk field: %d\n", ret);
+			return ret;
+		}
+		ret = regmap_fields_write(intfctl->en_16bit_unpack,
+					  idx,
+					  QAIF_CIF_16BIT_UNPACK_DISABLE);
+		if (ret) {
+			dev_err(soc_runtime->dev, "error writing en_16bit_unpack field: %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_qaif_cif_dai_ops = {
+	.hw_params	= qaif_cif_daiops_hw_params,
+	.trigger	= qaif_cif_daiops_trigger,
+};
+EXPORT_SYMBOL_GPL(asoc_qcom_qaif_cif_dai_ops);
-- 
2.34.1