ASoC: SOF: amd: Add Probe functionality support for amd platforms.

This patch consist of probe client device registration,stream tag
and dma channel configuration for SOF firmware.

Signed-off-by: V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>
Link: https://lore.kernel.org/r/20230713125709.418851-2-vsujithkumar.reddy@amd.corp-partner.google.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/amd/Kconfig

@@ -21,6 +21,7 @@ config SND_SOC_SOF_AMD_COMMON
 	select SND_SOC_SOF_PCI_DEV
 	select SND_AMD_ACP_CONFIG
 	select SND_SOC_SOF_XTENSA
+	select SND_SOC_SOF_ACP_PROBES
 	select SND_SOC_ACPI if ACPI
 	help
 	  This option is not user-selectable but automatically handled by
@@ -42,4 +43,11 @@ config SND_SOC_SOF_AMD_REMBRANDT
 	  Say Y if you want to enable SOF on Rembrandt.
 	  If unsure select "N".
 
+config SND_SOC_SOF_ACP_PROBES
+	tristate
+	select SND_SOC_SOF_DEBUG_PROBES
+	help
+	  This option is not user-selectable but automatically handled by
+	  'select' statements at a higher level
+
 endif

sound/soc/sof/amd/Makefile

@@ -5,6 +5,7 @@
 # Copyright(c) 2021 Advanced Micro Devices, Inc. All rights reserved.
 
 snd-sof-amd-acp-objs := acp.o acp-loader.o acp-ipc.o acp-pcm.o acp-stream.o acp-trace.o acp-common.o
+snd-sof-amd-acp-$(CONFIG_SND_SOC_SOF_ACP_PROBES) = acp-probes.o
 snd-sof-amd-renoir-objs := pci-rn.o renoir.o
 snd-sof-amd-rembrandt-objs := pci-rmb.o rembrandt.o
 

sound/soc/sof/amd/acp-common.c

@@ -196,6 +196,10 @@ struct snd_sof_dsp_ops sof_acp_common_ops = {
 	.dbg_dump		= amd_sof_dump,
 	.debugfs_add_region_item = snd_sof_debugfs_add_region_item_iomem,
 	.dsp_arch_ops = &sof_xtensa_arch_ops,
+
+	/* probe client device registation */
+	.register_ipc_clients = acp_probes_register,
+	.unregister_ipc_clients = acp_probes_unregister,
 };
 EXPORT_SYMBOL_NS(sof_acp_common_ops, SND_SOC_SOF_AMD_COMMON);
 

sound/soc/sof/amd/acp-ipc.c

@@ -155,6 +155,8 @@ out:
 irqreturn_t acp_sof_ipc_irq_thread(int irq, void *context)
 {
 	struct snd_sof_dev *sdev = context;
+	const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata);
+	struct acp_dev_data *adata = sdev->pdata->hw_pdata;
 	unsigned int dsp_msg_write = sdev->debug_box.offset +
 				     offsetof(struct scratch_ipc_conf, sof_dsp_msg_write);
 	unsigned int dsp_ack_write = sdev->debug_box.offset +
@@ -200,6 +202,30 @@ irqreturn_t acp_sof_ipc_irq_thread(int irq, void *context)
 		return IRQ_HANDLED;
 	}
 
+	if (desc->probe_reg_offset) {
+		u32 val;
+		u32 posn;
+
+		/* Probe register consists of two parts
+		 * (0-30) bit has cumulative position value
+		 * 31 bit is a synchronization flag between DSP and CPU
+		 * for the position update
+		 */
+		val = snd_sof_dsp_read(sdev, ACP_DSP_BAR, desc->probe_reg_offset);
+		if (val & PROBE_STATUS_BIT) {
+			posn = val & ~PROBE_STATUS_BIT;
+			if (adata->probe_stream) {
+				/* Probe related posn value is of 31 bits limited to 2GB
+				 * once wrapped DSP won't send posn interrupt.
+				 */
+				adata->probe_stream->cstream_posn = posn;
+				snd_compr_fragment_elapsed(adata->probe_stream->cstream);
+				snd_sof_dsp_write(sdev, ACP_DSP_BAR, desc->probe_reg_offset, posn);
+				ipc_irq = true;
+			}
+		}
+	}
+
 	if (!ipc_irq)
 		dev_dbg_ratelimited(sdev->dev, "nothing to do in IPC IRQ thread\n");
 

sound/soc/sof/amd/acp-probes.c

@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: (GPL-2.0-only 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) 2023 Advanced Micro Devices, Inc.
+//
+// Authors: V Sujith Kumar Reddy <Vsujithkumar.Reddy@amd.com>
+
+/*
+ * Probe interface for generic AMD audio ACP DSP block
+ */
+
+#include <linux/module.h>
+#include <sound/soc.h>
+#include "../sof-priv.h"
+#include "../sof-client-probes.h"
+#include "../sof-client.h"
+#include "../ops.h"
+#include "acp.h"
+#include "acp-dsp-offset.h"
+
+static int acp_probes_compr_startup(struct sof_client_dev *cdev,
+				    struct snd_compr_stream *cstream,
+				    struct snd_soc_dai *dai, u32 *stream_id)
+{
+	struct snd_sof_dev *sdev = sof_client_dev_to_sof_dev(cdev);
+	struct acp_dsp_stream *stream;
+	struct acp_dev_data *adata;
+
+	adata = sdev->pdata->hw_pdata;
+	stream = acp_dsp_stream_get(sdev, 0);
+	if (!stream)
+		return -ENODEV;
+
+	stream->cstream = cstream;
+	cstream->runtime->private_data = stream;
+
+	adata->probe_stream = stream;
+	*stream_id = stream->stream_tag;
+
+	return 0;
+}
+
+static int acp_probes_compr_shutdown(struct sof_client_dev *cdev,
+				     struct snd_compr_stream *cstream,
+				     struct snd_soc_dai *dai)
+{
+	struct snd_sof_dev *sdev = sof_client_dev_to_sof_dev(cdev);
+	struct acp_dsp_stream *stream = cstream->runtime->private_data;
+	struct acp_dev_data *adata;
+	int ret;
+
+	ret = acp_dsp_stream_put(sdev, stream);
+	if (ret < 0) {
+		dev_err(sdev->dev, "Failed to release probe compress stream\n");
+		return ret;
+	}
+
+	adata = sdev->pdata->hw_pdata;
+	stream->cstream = NULL;
+	cstream->runtime->private_data = NULL;
+	adata->probe_stream = NULL;
+
+	return 0;
+}
+
+static int acp_probes_compr_set_params(struct sof_client_dev *cdev,
+				       struct snd_compr_stream *cstream,
+				       struct snd_compr_params *params,
+				       struct snd_soc_dai *dai)
+{
+	struct snd_sof_dev *sdev = sof_client_dev_to_sof_dev(cdev);
+	struct acp_dsp_stream *stream = cstream->runtime->private_data;
+	unsigned int buf_offset, index;
+	u32 size;
+	int ret;
+
+	stream->dmab = cstream->runtime->dma_buffer_p;
+	stream->num_pages = PFN_UP(cstream->runtime->dma_bytes);
+	size = cstream->runtime->buffer_size;
+
+	ret = acp_dsp_stream_config(sdev, stream);
+	if (ret < 0) {
+		acp_dsp_stream_put(sdev, stream);
+		return ret;
+	}
+
+	/* write buffer size of stream in scratch memory */
+
+	buf_offset = sdev->debug_box.offset +
+		     offsetof(struct scratch_reg_conf, buf_size);
+	index = stream->stream_tag - 1;
+	buf_offset = buf_offset + index * 4;
+
+	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + buf_offset, size);
+
+	return 0;
+}
+
+static int acp_probes_compr_trigger(struct sof_client_dev *cdev,
+				    struct snd_compr_stream *cstream,
+				    int cmd, struct snd_soc_dai *dai)
+{
+	/* Nothing to do here, as it is a mandatory callback just defined */
+	return 0;
+}
+
+static int acp_probes_compr_pointer(struct sof_client_dev *cdev,
+				    struct snd_compr_stream *cstream,
+				    struct snd_compr_tstamp *tstamp,
+				    struct snd_soc_dai *dai)
+{
+	struct acp_dsp_stream *stream = cstream->runtime->private_data;
+	struct snd_soc_pcm_stream *pstream;
+
+	pstream = &dai->driver->capture;
+	tstamp->copied_total = stream->cstream_posn;
+	tstamp->sampling_rate = snd_pcm_rate_bit_to_rate(pstream->rates);
+
+	return 0;
+}
+
+/* SOF client implementation */
+static const struct sof_probes_host_ops acp_probes_ops = {
+	.startup = acp_probes_compr_startup,
+	.shutdown = acp_probes_compr_shutdown,
+	.set_params = acp_probes_compr_set_params,
+	.trigger = acp_probes_compr_trigger,
+	.pointer = acp_probes_compr_pointer,
+};
+
+int acp_probes_register(struct snd_sof_dev *sdev)
+{
+	return sof_client_dev_register(sdev, "acp-probes", 0, &acp_probes_ops,
+				       sizeof(acp_probes_ops));
+}
+EXPORT_SYMBOL_NS(acp_probes_register, SND_SOC_SOF_AMD_COMMON);
+
+void acp_probes_unregister(struct snd_sof_dev *sdev)
+{
+	sof_client_dev_unregister(sdev, "acp-probes", 0);
+}
+EXPORT_SYMBOL_NS(acp_probes_unregister, SND_SOC_SOF_AMD_COMMON);
+
+MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);
+

sound/soc/sof/amd/acp.h

@@ -77,6 +77,7 @@
 #define AMD_STACK_DUMP_SIZE			32
 
 #define SRAM1_SIZE				0x13A000
+#define PROBE_STATUS_BIT			BIT(31)
 
 enum clock_source {
 	ACP_CLOCK_96M = 0,
@@ -156,6 +157,8 @@ struct acp_dsp_stream {
 	int active;
 	unsigned int reg_offset;
 	size_t posn_offset;
+	struct snd_compr_stream *cstream;
+	u64 cstream_posn;
 };
 
 struct sof_amd_acp_desc {
@@ -168,6 +171,7 @@ struct sof_amd_acp_desc {
 	u32 hw_semaphore_offset;
 	u32 acp_clkmux_sel;
 	u32 fusion_dsp_offset;
+	u32 probe_reg_offset;
 };
 
 /* Common device data struct for ACP devices */
@@ -186,6 +190,7 @@ struct acp_dev_data {
 	struct acp_dsp_stream stream_buf[ACP_MAX_STREAM];
 	struct acp_dsp_stream *dtrace_stream;
 	struct pci_dev *smn_dev;
+	struct acp_dsp_stream *probe_stream;
 };
 
 void memcpy_to_scratch(struct snd_sof_dev *sdev, u32 offset, unsigned int *src, size_t bytes);
@@ -273,4 +278,8 @@ static inline const struct sof_amd_acp_desc *get_chip_info(struct snd_sof_pdata
 
 	return desc->chip_info;
 }
+
+int acp_probes_register(struct snd_sof_dev *sdev);
+void acp_probes_unregister(struct snd_sof_dev *sdev);
+
 #endif