diff --git a/marvell/linux/sound/usb/6fire/firmware.c b/marvell/linux/sound/usb/6fire/firmware.c
new file mode 100644
index 0000000..2333e8f
--- /dev/null
+++ b/marvell/linux/sound/usb/6fire/firmware.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Linux driver for TerraTec DMX 6Fire USB
+ *
+ * Firmware loader
+ *
+ * Author:	Torsten Schenk <torsten.schenk@zoho.com>
+ * Created:	Jan 01, 2011
+ * Copyright:	(C) Torsten Schenk
+ */
+
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/bitrev.h>
+#include <linux/kernel.h>
+
+#include "firmware.h"
+#include "chip.h"
+
+MODULE_FIRMWARE("6fire/dmx6firel2.ihx");
+MODULE_FIRMWARE("6fire/dmx6fireap.ihx");
+MODULE_FIRMWARE("6fire/dmx6firecf.bin");
+
+enum {
+	FPGA_BUFSIZE = 512, FPGA_EP = 2
+};
+
+/*
+ * wMaxPacketSize of pcm endpoints.
+ * keep synced with rates_in_packet_size and rates_out_packet_size in pcm.c
+ * fpp: frames per isopacket
+ *
+ * CAUTION: keep sizeof <= buffer[] in usb6fire_fw_init
+ */
+static const u8 ep_w_max_packet_size[] = {
+	0xe4, 0x00, 0xe4, 0x00, /* alt 1: 228 EP2 and EP6 (7 fpp) */
+	0xa4, 0x01, 0xa4, 0x01, /* alt 2: 420 EP2 and EP6 (13 fpp)*/
+	0x94, 0x01, 0x5c, 0x02  /* alt 3: 404 EP2 and 604 EP6 (25 fpp) */
+};
+
+static const u8 known_fw_versions[][2] = {
+	{ 0x03, 0x01 }
+};
+
+struct ihex_record {
+	u16 address;
+	u8 len;
+	u8 data[256];
+	char error; /* true if an error occurred parsing this record */
+
+	u8 max_len; /* maximum record length in whole ihex */
+
+	/* private */
+	const char *txt_data;
+	unsigned int txt_length;
+	unsigned int txt_offset; /* current position in txt_data */
+};
+
+static u8 usb6fire_fw_ihex_hex(const u8 *data, u8 *crc)
+{
+	u8 val = 0;
+	int hval;
+
+	hval = hex_to_bin(data[0]);
+	if (hval >= 0)
+		val |= (hval << 4);
+
+	hval = hex_to_bin(data[1]);
+	if (hval >= 0)
+		val |= hval;
+
+	*crc += val;
+	return val;
+}
+
+/*
+ * returns true if record is available, false otherwise.
+ * iff an error occurred, false will be returned and record->error will be true.
+ */
+static bool usb6fire_fw_ihex_next_record(struct ihex_record *record)
+{
+	u8 crc = 0;
+	u8 type;
+	int i;
+
+	record->error = false;
+
+	/* find begin of record (marked by a colon) */
+	while (record->txt_offset < record->txt_length
+			&& record->txt_data[record->txt_offset] != ':')
+		record->txt_offset++;
+	if (record->txt_offset == record->txt_length)
+		return false;
+
+	/* number of characters needed for len, addr and type entries */
+	record->txt_offset++;
+	if (record->txt_offset + 8 > record->txt_length) {
+		record->error = true;
+		return false;
+	}
+
+	record->len = usb6fire_fw_ihex_hex(record->txt_data +
+			record->txt_offset, &crc);
+	record->txt_offset += 2;
+	record->address = usb6fire_fw_ihex_hex(record->txt_data +
+			record->txt_offset, &crc) << 8;
+	record->txt_offset += 2;
+	record->address |= usb6fire_fw_ihex_hex(record->txt_data +
+			record->txt_offset, &crc);
+	record->txt_offset += 2;
+	type = usb6fire_fw_ihex_hex(record->txt_data +
+			record->txt_offset, &crc);
+	record->txt_offset += 2;
+
+	/* number of characters needed for data and crc entries */
+	if (record->txt_offset + 2 * (record->len + 1) > record->txt_length) {
+		record->error = true;
+		return false;
+	}
+	for (i = 0; i < record->len; i++) {
+		record->data[i] = usb6fire_fw_ihex_hex(record->txt_data
+				+ record->txt_offset, &crc);
+		record->txt_offset += 2;
+	}
+	usb6fire_fw_ihex_hex(record->txt_data + record->txt_offset, &crc);
+	if (crc) {
+		record->error = true;
+		return false;
+	}
+
+	if (type == 1 || !record->len) /* eof */
+		return false;
+	else if (type == 0)
+		return true;
+	else {
+		record->error = true;
+		return false;
+	}
+}
+
+static int usb6fire_fw_ihex_init(const struct firmware *fw,
+		struct ihex_record *record)
+{
+	record->txt_data = fw->data;
+	record->txt_length = fw->size;
+	record->txt_offset = 0;
+	record->max_len = 0;
+	/* read all records, if loop ends, record->error indicates,
+	 * whether ihex is valid. */
+	while (usb6fire_fw_ihex_next_record(record))
+		record->max_len = max(record->len, record->max_len);
+	if (record->error)
+		return -EINVAL;
+	record->txt_offset = 0;
+	return 0;
+}
+
+static int usb6fire_fw_ezusb_write(struct usb_device *device,
+		int type, int value, char *data, int len)
+{
+	int ret;
+
+	ret = usb_control_msg(device, usb_sndctrlpipe(device, 0), type,
+			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			value, 0, data, len, 1000);
+	if (ret < 0)
+		return ret;
+	else if (ret != len)
+		return -EIO;
+	return 0;
+}
+
+static int usb6fire_fw_ezusb_read(struct usb_device *device,
+		int type, int value, char *data, int len)
+{
+	int ret = usb_control_msg(device, usb_rcvctrlpipe(device, 0), type,
+			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, value,
+			0, data, len, 1000);
+	if (ret < 0)
+		return ret;
+	else if (ret != len)
+		return -EIO;
+	return 0;
+}
+
+static int usb6fire_fw_fpga_write(struct usb_device *device,
+		char *data, int len)
+{
+	int actual_len;
+	int ret;
+
+	ret = usb_bulk_msg(device, usb_sndbulkpipe(device, FPGA_EP), data, len,
+			&actual_len, 1000);
+	if (ret < 0)
+		return ret;
+	else if (actual_len != len)
+		return -EIO;
+	return 0;
+}
+
+static int usb6fire_fw_ezusb_upload(
+		struct usb_interface *intf, const char *fwname,
+		unsigned int postaddr, u8 *postdata, unsigned int postlen)
+{
+	int ret;
+	u8 data;
+	struct usb_device *device = interface_to_usbdev(intf);
+	const struct firmware *fw = NULL;
+	struct ihex_record *rec = kmalloc(sizeof(struct ihex_record),
+			GFP_KERNEL);
+
+	if (!rec)
+		return -ENOMEM;
+
+	ret = request_firmware(&fw, fwname, &device->dev);
+	if (ret < 0) {
+		kfree(rec);
+		dev_err(&intf->dev,
+			"error requesting ezusb firmware %s.\n", fwname);
+		return ret;
+	}
+	ret = usb6fire_fw_ihex_init(fw, rec);
+	if (ret < 0) {
+		kfree(rec);
+		release_firmware(fw);
+		dev_err(&intf->dev,
+			"error validating ezusb firmware %s.\n", fwname);
+		return ret;
+	}
+	/* upload firmware image */
+	data = 0x01; /* stop ezusb cpu */
+	ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
+	if (ret < 0) {
+		kfree(rec);
+		release_firmware(fw);
+		dev_err(&intf->dev,
+			"unable to upload ezusb firmware %s: begin message.\n",
+			fwname);
+		return ret;
+	}
+
+	while (usb6fire_fw_ihex_next_record(rec)) { /* write firmware */
+		ret = usb6fire_fw_ezusb_write(device, 0xa0, rec->address,
+				rec->data, rec->len);
+		if (ret < 0) {
+			kfree(rec);
+			release_firmware(fw);
+			dev_err(&intf->dev,
+				"unable to upload ezusb firmware %s: data urb.\n",
+				fwname);
+			return ret;
+		}
+	}
+
+	release_firmware(fw);
+	kfree(rec);
+	if (postdata) { /* write data after firmware has been uploaded */
+		ret = usb6fire_fw_ezusb_write(device, 0xa0, postaddr,
+				postdata, postlen);
+		if (ret < 0) {
+			dev_err(&intf->dev,
+				"unable to upload ezusb firmware %s: post urb.\n",
+				fwname);
+			return ret;
+		}
+	}
+
+	data = 0x00; /* resume ezusb cpu */
+	ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
+	if (ret < 0) {
+		dev_err(&intf->dev,
+			"unable to upload ezusb firmware %s: end message.\n",
+			fwname);
+		return ret;
+	}
+	return 0;
+}
+
+static int usb6fire_fw_fpga_upload(
+		struct usb_interface *intf, const char *fwname)
+{
+	int ret;
+	int i;
+	struct usb_device *device = interface_to_usbdev(intf);
+	u8 *buffer = kmalloc(FPGA_BUFSIZE, GFP_KERNEL);
+	const char *c;
+	const char *end;
+	const struct firmware *fw;
+
+	if (!buffer)
+		return -ENOMEM;
+
+	ret = request_firmware(&fw, fwname, &device->dev);
+	if (ret < 0) {
+		dev_err(&intf->dev, "unable to get fpga firmware %s.\n",
+				fwname);
+		kfree(buffer);
+		return -EIO;
+	}
+
+	c = fw->data;
+	end = fw->data + fw->size;
+
+	ret = usb6fire_fw_ezusb_write(device, 8, 0, NULL, 0);
+	if (ret < 0) {
+		kfree(buffer);
+		release_firmware(fw);
+		dev_err(&intf->dev,
+			"unable to upload fpga firmware: begin urb.\n");
+		return ret;
+	}
+
+	while (c != end) {
+		for (i = 0; c != end && i < FPGA_BUFSIZE; i++, c++)
+			buffer[i] = bitrev8((u8)*c);
+
+		ret = usb6fire_fw_fpga_write(device, buffer, i);
+		if (ret < 0) {
+			release_firmware(fw);
+			kfree(buffer);
+			dev_err(&intf->dev,
+				"unable to upload fpga firmware: fw urb.\n");
+			return ret;
+		}
+	}
+	release_firmware(fw);
+	kfree(buffer);
+
+	ret = usb6fire_fw_ezusb_write(device, 9, 0, NULL, 0);
+	if (ret < 0) {
+		dev_err(&intf->dev,
+			"unable to upload fpga firmware: end urb.\n");
+		return ret;
+	}
+	return 0;
+}
+
+/* check, if the firmware version the devices has currently loaded
+ * is known by this driver. 'version' needs to have 4 bytes version
+ * info data. */
+static int usb6fire_fw_check(struct usb_interface *intf, const u8 *version)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(known_fw_versions); i++)
+		if (!memcmp(version, known_fw_versions + i, 2))
+			return 0;
+
+	dev_err(&intf->dev, "invalid firmware version in device: %4ph. "
+			"please reconnect to power. if this failure "
+			"still happens, check your firmware installation.",
+			version);
+	return -EINVAL;
+}
+
+int usb6fire_fw_init(struct usb_interface *intf)
+{
+	int i;
+	int ret;
+	struct usb_device *device = interface_to_usbdev(intf);
+	/* buffer: 8 receiving bytes from device and
+	 * sizeof(EP_W_MAX_PACKET_SIZE) bytes for non-const copy */
+	u8 buffer[12];
+
+	ret = usb6fire_fw_ezusb_read(device, 1, 0, buffer, 8);
+	if (ret < 0) {
+		dev_err(&intf->dev,
+			"unable to receive device firmware state.\n");
+		return ret;
+	}
+	if (buffer[0] != 0xeb || buffer[1] != 0xaa || buffer[2] != 0x55) {
+		dev_err(&intf->dev,
+			"unknown device firmware state received from device:");
+		for (i = 0; i < 8; i++)
+			printk(KERN_CONT "%02x ", buffer[i]);
+		printk(KERN_CONT "\n");
+		return -EIO;
+	}
+	/* do we need fpga loader ezusb firmware? */
+	if (buffer[3] == 0x01) {
+		ret = usb6fire_fw_ezusb_upload(intf,
+				"6fire/dmx6firel2.ihx", 0, NULL, 0);
+		if (ret < 0)
+			return ret;
+		return FW_NOT_READY;
+	}
+	/* do we need fpga firmware and application ezusb firmware? */
+	else if (buffer[3] == 0x02) {
+		ret = usb6fire_fw_check(intf, buffer + 4);
+		if (ret < 0)
+			return ret;
+		ret = usb6fire_fw_fpga_upload(intf, "6fire/dmx6firecf.bin");
+		if (ret < 0)
+			return ret;
+		memcpy(buffer, ep_w_max_packet_size,
+				sizeof(ep_w_max_packet_size));
+		ret = usb6fire_fw_ezusb_upload(intf, "6fire/dmx6fireap.ihx",
+				0x0003,	buffer, sizeof(ep_w_max_packet_size));
+		if (ret < 0)
+			return ret;
+		return FW_NOT_READY;
+	}
+	/* all fw loaded? */
+	else if (buffer[3] == 0x03)
+		return usb6fire_fw_check(intf, buffer + 4);
+	/* unknown data? */
+	else {
+		dev_err(&intf->dev,
+			"unknown device firmware state received from device: ");
+		for (i = 0; i < 8; i++)
+			printk(KERN_CONT "%02x ", buffer[i]);
+		printk(KERN_CONT "\n");
+		return -EIO;
+	}
+	return 0;
+}
+