[PATCH 11/15] ASoC: SDCA: Add FDL library for XU entities

[Charles Keepax <ckeepax@opensource.cirrus.com>]

From: Maciej Strozek <mstrozek@opensource.cirrus.com>

Some instances of the XU Entity have a need for Files to be downloaded
from the Host. In these XUs, there is one instance of a Host to Device
(Consumer) UMP, identified by the FDL_CurrentOwner Control. XU Library
introduced here implements the FDL flow triggered by FDL_CurrentOwner
irq, which sends a file from SoundWire File Table (SWFT) or from the
firmware directory in specific cases, to the Device FDL UMP.

Currently only Direct method of FDL is implemented.

Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
---
 include/sound/sdca_entity_xu.h  |  52 ++++++
 include/sound/sdca_function.h   |  21 +++
 sound/soc/sdca/Kconfig          |   7 +
 sound/soc/sdca/Makefile         |   1 +
 sound/soc/sdca/sdca_entity_xu.c | 315 ++++++++++++++++++++++++++++++++
 5 files changed, 396 insertions(+)
 create mode 100644 include/sound/sdca_entity_xu.h
 create mode 100644 sound/soc/sdca/sdca_entity_xu.c

diff --git a/include/sound/sdca_entity_xu.h b/include/sound/sdca_entity_xu.h
new file mode 100644
index 0000000000000..6f2ab0fc905a8
--- /dev/null
+++ b/include/sound/sdca_entity_xu.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * The MIPI SDCA specification is available for public downloads at
+ * https://www.mipi.org/mipi-sdca-v1-0-download
+ *
+ * Copyright (C) 2025 Cirrus Logic, Inc. and
+ *                    Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef __SDCA_ENTITY_XU_H__
+#define __SDCA_ENTITY_XU_H__
+
+struct sdca_fdl_set;
+struct sdca_interrupt;
+
+/**
+ * struct fdl_state - FDL state structure to keep data between interrupts
+ * @set: Pointer to the FDL set currently being downloaded.
+ * @file_index: Index of the current file being processed.
+ */
+struct fdl_state {
+	struct sdca_fdl_set *set;
+	int file_index;
+};
+
+#define SDCA_CTL_XU_FDLH_COMPLETE	0
+#define SDCA_CTL_XU_FDLH_MORE_FILES	SDCA_CTL_XU_FDLH_SET_IN_PROGRESS
+#define SDCA_CTL_XU_FDLH_FILE_AVAILABLE	(SDCA_CTL_XU_FDLH_TRANSFERRED_FILE | \
+					 SDCA_CTL_XU_FDLH_SET_IN_PROGRESS)
+#define SDCA_CTL_XU_FDLH_MASK		(SDCA_CTL_XU_FDLH_TRANSFERRED_CHUNK | \
+					 SDCA_CTL_XU_FDLH_TRANSFERRED_FILE | \
+					 SDCA_CTL_XU_FDLH_SET_IN_PROGRESS | \
+					 SDCA_CTL_XU_FDLH_RESET_ACK | \
+					 SDCA_CTL_XU_FDLH_REQ_ABORT)
+
+#define SDCA_CTL_XU_FDLD_COMPLETE	0
+#define SDCA_CTL_XU_FDLD_FILE_OK	(SDCA_CTL_XU_FDLH_TRANSFERRED_FILE | \
+					 SDCA_CTL_XU_FDLH_SET_IN_PROGRESS | \
+					 SDCA_CTL_XU_FDLD_ACK_TRANSFER | \
+					 SDCA_CTL_XU_FDLD_NEEDS_SET)
+#define SDCA_CTL_XU_FDLD_MORE_FILES_OK	(SDCA_CTL_XU_FDLH_SET_IN_PROGRESS | \
+					 SDCA_CTL_XU_FDLD_ACK_TRANSFER | \
+					 SDCA_CTL_XU_FDLD_NEEDS_SET)
+#define SDCA_CTL_XU_FDLD_MASK		(SDCA_CTL_XU_FDLD_REQ_RESET | \
+					 SDCA_CTL_XU_FDLD_REQ_ABORT | \
+					 SDCA_CTL_XU_FDLD_ACK_TRANSFER | \
+					 SDCA_CTL_XU_FDLD_NEEDS_SET)
+
+int sdca_fdl_alloc_state(struct sdca_interrupt *interrupt);
+int sdca_fdl_process(struct sdca_interrupt *interrupt);
+
+#endif // __SDCA_ENTITY_XU_H__
diff --git a/include/sound/sdca_function.h b/include/sound/sdca_function.h
index 7ee2f6666958b..7578615b8dbdf 100644
--- a/include/sound/sdca_function.h
+++ b/include/sound/sdca_function.h
@@ -285,6 +285,27 @@ enum sdca_xu_controls {
 	SDCA_CTL_XU_FDL_STATUS				= 0x14,
 	SDCA_CTL_XU_FDL_SET_INDEX			= 0x15,
 	SDCA_CTL_XU_FDL_HOST_REQUEST			= 0x16,
+
+	/* FDL Status Host->Device bit definitions */
+	SDCA_CTL_XU_FDLH_TRANSFERRED_CHUNK		= BIT(0),
+	SDCA_CTL_XU_FDLH_TRANSFERRED_FILE		= BIT(1),
+	SDCA_CTL_XU_FDLH_SET_IN_PROGRESS		= BIT(2),
+	SDCA_CTL_XU_FDLH_RESET_ACK			= BIT(4),
+	SDCA_CTL_XU_FDLH_REQ_ABORT			= BIT(5),
+	/* FDL Status Device->Host bit definitions */
+	SDCA_CTL_XU_FDLD_REQ_RESET			= BIT(4),
+	SDCA_CTL_XU_FDLD_REQ_ABORT			= BIT(5),
+	SDCA_CTL_XU_FDLD_ACK_TRANSFER			= BIT(6),
+	SDCA_CTL_XU_FDLD_NEEDS_SET			= BIT(7),
+};
+
+/**
+ * enum sdca_set_index_range - Column definitions UMP SetIndex
+ */
+enum sdca_fdl_set_index_range {
+	SDCA_FDL_SET_INDEX_SET_NUMBER			= 0,
+	SDCA_FDL_SET_INDEX_FILE_SET_ID			= 1,
+	SDCA_FDL_SET_INDEX_NCOLS			= 2,
 };
 
 /**
diff --git a/sound/soc/sdca/Kconfig b/sound/soc/sdca/Kconfig
index 6a3ba43f26bd9..a607e2a28fc67 100644
--- a/sound/soc/sdca/Kconfig
+++ b/sound/soc/sdca/Kconfig
@@ -25,6 +25,13 @@ config SND_SOC_SDCA_IRQ
 	help
 	  This option enables support for SDCA IRQs.
 
+config SND_SOC_SDCA_XU
+	bool "SDCA XU support"
+	depends on SND_SOC_SDCA
+	default y
+	help
+	  This option enables support for the MIPI SDCA XU Entity driver.
+
 config SND_SOC_SDCA_OPTIONAL
 	def_tristate SND_SOC_SDCA || !SND_SOC_SDCA
 
diff --git a/sound/soc/sdca/Makefile b/sound/soc/sdca/Makefile
index a1b24c95cd8c8..f2155eb6b6f98 100644
--- a/sound/soc/sdca/Makefile
+++ b/sound/soc/sdca/Makefile
@@ -4,5 +4,6 @@ snd-soc-sdca-y := sdca_functions.o sdca_device.o sdca_regmap.o sdca_asoc.o \
 		  sdca_ump.o
 snd-soc-sdca-$(CONFIG_SND_SOC_SDCA_HID) += sdca_hid.o
 snd-soc-sdca-$(CONFIG_SND_SOC_SDCA_IRQ) += sdca_interrupts.o
+snd-soc-sdca-$(CONFIG_SND_SOC_SDCA_XU) += sdca_entity_xu.o
 
 obj-$(CONFIG_SND_SOC_SDCA) += snd-soc-sdca.o
diff --git a/sound/soc/sdca/sdca_entity_xu.c b/sound/soc/sdca/sdca_entity_xu.c
new file mode 100644
index 0000000000000..ff7758460edc3
--- /dev/null
+++ b/sound/soc/sdca/sdca_entity_xu.c
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2025 Cirrus Logic, Inc. and
+//                    Cirrus Logic International Semiconductor Ltd.
+
+/*
+ * The MIPI SDCA specification is available for public downloads at
+ * https://www.mipi.org/mipi-sdca-v1-0-download
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/dev_printk.h>
+#include <linux/dmi.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/regmap.h>
+#include <linux/sprintf.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <sound/sdca.h>
+#include <sound/sdca_entity_xu.h>
+#include <sound/sdca_function.h>
+#include <sound/sdca_interrupts.h>
+#include <sound/sdca_ump.h>
+
+/**
+ * sdca_fdl_alloc_state - allocate state for an FDL interrupt
+ * @interrupt: SDCA interrupt structure.
+ *
+ * Return: Zero on success or a negative error code.
+ */
+int sdca_fdl_alloc_state(struct sdca_interrupt *interrupt)
+{
+	struct device *dev = interrupt->dev;
+	struct fdl_state *fdl_state;
+
+	fdl_state = devm_kzalloc(dev, sizeof(struct fdl_state), GFP_KERNEL);
+	if (!fdl_state)
+		return -ENOMEM;
+
+	interrupt->priv = fdl_state;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(sdca_fdl_alloc_state, "SND_SOC_SDCA");
+
+static char *fdl_get_sku_filename(struct device *dev,
+				  struct sdca_fdl_file *fdl_file)
+{
+	struct device *parent = dev;
+	const char *product_vendor;
+	const char *product_sku;
+
+	/*
+	 * Try to find pci_dev manually because the card may not be ready to be
+	 * used for snd_soc_card_get_pci_ssid yet
+	 */
+	while (parent) {
+		if (dev_is_pci(parent)) {
+			struct pci_dev *pci_dev = to_pci_dev(parent);
+
+			return kasprintf(GFP_KERNEL, "sdca/%x/%x/%x/%x.bin",
+					 fdl_file->vendor_id,
+					 pci_dev->subsystem_vendor,
+					 pci_dev->subsystem_device,
+					 fdl_file->file_id);
+		} else {
+			parent = parent->parent;
+		}
+	}
+
+	product_vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+	if (!product_vendor || !strcmp(product_vendor, "Default string"))
+		product_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
+	if (!product_vendor || !strcmp(product_vendor, "Default string"))
+		product_vendor = dmi_get_system_info(DMI_CHASSIS_VENDOR);
+	if (!product_vendor)
+		product_vendor = "unknown";
+
+	product_sku = dmi_get_system_info(DMI_PRODUCT_SKU);
+	if (!product_sku || !strcmp(product_sku, "Default string"))
+		product_sku = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (!product_sku)
+		product_sku = "unknown";
+
+	return kasprintf(GFP_KERNEL, "sdca/%x/%s/%s/%x.bin", fdl_file->vendor_id,
+			 product_vendor, product_sku, fdl_file->file_id);
+}
+
+static int fdl_load_file(struct sdca_interrupt *interrupt,
+			 struct sdca_fdl_set *set, int file_index)
+{
+	struct device *dev = interrupt->dev;
+	struct sdca_fdl_data *fdl_data = &interrupt->function->fdl_data;
+	const struct firmware *firmware = NULL;
+	struct acpi_sw_file *swf = NULL, *tmp;
+	struct sdca_fdl_file *fdl_file;
+	char *disk_filename;
+	int ret;
+	int i;
+
+	if (!set) {
+		dev_err(dev, "request to load file with no set\n");
+		return -EINVAL;
+	}
+
+	fdl_file = &set->files[file_index];
+
+	if (fdl_data->swft) {
+		tmp = fdl_data->swft->files;
+		for (i = 0; i < fdl_data->swft->header.length; i += tmp->file_length,
+		     tmp = ACPI_ADD_PTR(struct acpi_sw_file, tmp, tmp->file_length)) {
+			if (tmp->vendor_id == fdl_file->vendor_id &&
+			    tmp->file_id == fdl_file->file_id) {
+				dev_dbg(dev, "located SWF in ACPI: %x-%x-%x\n",
+					tmp->vendor_id, tmp->file_id,
+					tmp->file_version);
+				swf = tmp;
+				break;
+			}
+		}
+	}
+
+	disk_filename = fdl_get_sku_filename(dev, fdl_file);
+	if (!disk_filename)
+		return -ENOMEM;
+
+	dev_dbg(dev, "FDL disk filename: %s\n", disk_filename);
+
+	ret = firmware_request_nowarn(&firmware, disk_filename, dev);
+	kfree(disk_filename);
+	if (ret) {
+		disk_filename = kasprintf(GFP_KERNEL, "sdca/%x/%x.bin",
+					  fdl_file->vendor_id, fdl_file->file_id);
+		if (!disk_filename)
+			return -ENOMEM;
+
+		dev_dbg(dev, "FDL disk filename: %s\n", disk_filename);
+
+		ret = firmware_request_nowarn(&firmware, disk_filename, dev);
+		kfree(disk_filename);
+	}
+
+	if (!ret) {
+		tmp = (struct acpi_sw_file *)&firmware->data[0];
+
+		if (!swf || swf->file_version <= tmp->file_version) {
+			dev_dbg(dev, "using SWF from disk: %x-%x-%x\n",
+				tmp->vendor_id, tmp->file_id, tmp->file_version);
+			swf = tmp;
+		}
+	} else if (!swf) {
+		dev_err(dev, "failed to locate SWF\n");
+		return -ENOENT;
+	}
+
+	ret = sdca_ump_write_message(dev, interrupt->device_regmap,
+				     interrupt->function_regmap,
+				     interrupt->function, interrupt->entity,
+				     SDCA_CTL_XU_FDL_MESSAGEOFFSET, fdl_file->fdl_offset,
+				     SDCA_CTL_XU_FDL_MESSAGELENGTH, swf->data,
+				     swf->file_length - offsetof(struct acpi_sw_file, data));
+	release_firmware(firmware);
+	return ret;
+}
+
+static struct sdca_fdl_set *fdl_get_set(struct sdca_interrupt *interrupt)
+{
+	struct device *dev = interrupt->dev;
+	struct sdca_fdl_data *fdl_data = &interrupt->function->fdl_data;
+	struct sdca_entity *xu = interrupt->entity;
+	struct sdca_control_range *range;
+	unsigned int val;
+	int i, ret;
+
+	ret = regmap_read(interrupt->function_regmap,
+			  SDW_SDCA_CTL(interrupt->function->desc->adr, xu->id,
+				       SDCA_CTL_XU_FDL_SET_INDEX, 0),
+			  &val);
+	if (ret < 0) {
+		dev_err(dev, "failed to read FDL set index: %d\n", ret);
+		return NULL;
+	}
+
+	range = sdca_selector_find_range(dev, xu, SDCA_CTL_XU_FDL_SET_INDEX,
+					 SDCA_FDL_SET_INDEX_NCOLS, 0);
+
+	val = sdca_range_search(range, SDCA_FDL_SET_INDEX_SET_NUMBER,
+				val, SDCA_FDL_SET_INDEX_FILE_SET_ID);
+
+	for (i = 0; i < fdl_data->num_sets; i++) {
+		if (fdl_data->sets[i].id == val)
+			return &fdl_data->sets[i];
+	}
+
+	dev_err(dev, "invalid fileset id: %d\n", val);
+	return NULL;
+}
+
+static void fdl_end(struct sdca_interrupt *interrupt)
+{
+	struct fdl_state *fdl_state = interrupt->priv;
+
+	if (!fdl_state->set)
+		return;
+
+	fdl_state->set = NULL;
+
+	dev_dbg(interrupt->dev, "completed FDL process\n");
+}
+
+static unsigned int fdl_status_process(struct sdca_interrupt *interrupt,
+				       unsigned int status)
+{
+	struct fdl_state *fdl_state = interrupt->priv;
+	int ret;
+
+	switch (status) {
+	case SDCA_CTL_XU_FDLD_NEEDS_SET:
+		dev_dbg(interrupt->dev, "starting FDL process...\n");
+
+		fdl_state->file_index = 0;
+		fdl_state->set = fdl_get_set(interrupt);
+		fallthrough;
+	case SDCA_CTL_XU_FDLD_MORE_FILES_OK:
+		ret = fdl_load_file(interrupt, fdl_state->set, fdl_state->file_index);
+		if (ret) {
+			fdl_end(interrupt);
+			return SDCA_CTL_XU_FDLH_REQ_ABORT;
+		}
+
+		return SDCA_CTL_XU_FDLH_FILE_AVAILABLE;
+	case SDCA_CTL_XU_FDLD_FILE_OK:
+		if (!fdl_state->set) {
+			fdl_end(interrupt);
+			return SDCA_CTL_XU_FDLH_REQ_ABORT;
+		}
+
+		fdl_state->file_index++;
+
+		if (fdl_state->file_index < fdl_state->set->num_files)
+			return SDCA_CTL_XU_FDLH_MORE_FILES;
+		fallthrough;
+	case SDCA_CTL_XU_FDLD_COMPLETE:
+		fdl_end(interrupt);
+		return SDCA_CTL_XU_FDLH_COMPLETE;
+	default:
+		fdl_end(interrupt);
+
+		if (status & SDCA_CTL_XU_FDLD_REQ_RESET)
+			return SDCA_CTL_XU_FDLH_RESET_ACK;
+		else if (status & SDCA_CTL_XU_FDLD_REQ_ABORT)
+			return SDCA_CTL_XU_FDLH_COMPLETE;
+
+		dev_err(interrupt->dev, "invalid FDL status: %x\n", status);
+		return SDCA_CTL_XU_FDLH_REQ_ABORT;
+	}
+}
+
+/**
+ * sdca_fdl_process - Process the FDL state machine
+ * @interrupt: SDCA interrupt structure
+ *
+ * Based on section 13.2.5 Flow Diagram for File Download, Host side.
+ *
+ * Return: Zero on success or a negative error code.
+ */
+int sdca_fdl_process(struct sdca_interrupt *interrupt)
+{
+	struct device *dev = interrupt->dev;
+	unsigned int reg, status, response;
+	int ret;
+
+	ret = sdca_ump_get_owner_host(dev, interrupt->function_regmap,
+				      interrupt->function, interrupt->entity,
+				      interrupt->control);
+	if (ret)
+		return ret;
+
+	reg = SDW_SDCA_CTL(interrupt->function->desc->adr, interrupt->entity->id,
+			   SDCA_CTL_XU_FDL_STATUS, 0);
+	ret = regmap_read(interrupt->function_regmap, reg, &status);
+	if (ret < 0) {
+		dev_err(dev, "failed to read FDL status: %d\n", ret);
+		return ret;
+	}
+
+	dev_dbg(dev, "FDL status: %#x\n", status);
+
+	response = fdl_status_process(interrupt, status);
+
+	dev_dbg(dev, "FDL response: %#x\n", response);
+
+	ret = regmap_write(interrupt->function_regmap, reg,
+			   response | (status & ~SDCA_CTL_XU_FDLH_MASK));
+	if (ret < 0) {
+		dev_err(dev, "failed to set FDL status signal: %d\n", ret);
+		return ret;
+	}
+
+	ret = sdca_ump_set_owner_device(dev, interrupt->function_regmap,
+					interrupt->function, interrupt->entity,
+					interrupt->control);
+	if (ret)
+		return ret;
+
+	if (response == SDCA_CTL_XU_FDLH_RESET_ACK) {
+		dev_dbg(dev, "FDL request reset\n");
+		// FIXME: Add reset of device
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(sdca_fdl_process, "SND_SOC_SDCA");
-- 
2.47.2