drivers/net/wireless/mediatek/mt76/mt76x0/usb_mcu.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt76x0/usb_mcu.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt76x0/usb_mcu.c
Extension
.c
Size
4188 bytes
Lines
176
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: BSD-3-Clause-Clear
/*
 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
 */
#include <linux/kernel.h>
#include <linux/firmware.h>
#include <linux/module.h>

#include "mt76x0.h"
#include "mcu.h"
#include "../mt76x02_usb.h"

#define MCU_FW_URB_MAX_PAYLOAD		0x38f8
#define MCU_FW_URB_SIZE			(MCU_FW_URB_MAX_PAYLOAD + 12)

static int
mt76x0u_upload_firmware(struct mt76x02_dev *dev,
			const struct mt76x02_fw_header *hdr)
{
	u8 *fw_payload = (u8 *)(hdr + 1);
	u32 ilm_len, dlm_len;
	void *ivb;
	int err;

	ivb = kmemdup(fw_payload, MT_MCU_IVB_SIZE, GFP_KERNEL);
	if (!ivb)
		return -ENOMEM;

	ilm_len = le32_to_cpu(hdr->ilm_len) - MT_MCU_IVB_SIZE;
	dev_dbg(dev->mt76.dev, "loading FW - ILM %u + IVB %u\n",
		ilm_len, MT_MCU_IVB_SIZE);
	err = mt76x02u_mcu_fw_send_data(dev, fw_payload + MT_MCU_IVB_SIZE,
					ilm_len, MCU_FW_URB_MAX_PAYLOAD,
					MT_MCU_IVB_SIZE);
	if (err)
		goto out;

	dlm_len = le32_to_cpu(hdr->dlm_len);
	dev_dbg(dev->mt76.dev, "loading FW - DLM %u\n", dlm_len);
	err = mt76x02u_mcu_fw_send_data(dev,
					fw_payload + le32_to_cpu(hdr->ilm_len),
					dlm_len, MCU_FW_URB_MAX_PAYLOAD,
					MT_MCU_DLM_OFFSET);
	if (err)
		goto out;

	err = mt76u_vendor_request(&dev->mt76, MT_VEND_DEV_MODE,
				   USB_DIR_OUT | USB_TYPE_VENDOR,
				   0x12, 0, ivb, MT_MCU_IVB_SIZE);
	if (err < 0)
		goto out;

	if (!mt76_poll_msec(dev, MT_MCU_COM_REG0, 1, 1, 1000)) {
		dev_err(dev->mt76.dev, "Firmware failed to start\n");
		err = -ETIMEDOUT;
		goto out;
	}

	dev_dbg(dev->mt76.dev, "Firmware running!\n");

out:
	kfree(ivb);

	return err;
}

static int mt76x0_get_firmware(struct mt76x02_dev *dev,
			       const struct firmware **fw)
{
	int err;

	/* try to load mt7610e fw if available
	 * otherwise fall back to mt7610u one
	 */
	err = firmware_request_nowarn(fw, MT7610E_FIRMWARE, dev->mt76.dev);
	if (err) {
		dev_info(dev->mt76.dev, "%s not found, switching to %s",
			 MT7610E_FIRMWARE, MT7610U_FIRMWARE);
		return request_firmware(fw, MT7610U_FIRMWARE,
					dev->mt76.dev);
	}
	return 0;
}

static int mt76x0u_load_firmware(struct mt76x02_dev *dev)
{
	const struct firmware *fw;
	const struct mt76x02_fw_header *hdr;
	int len, ret;
	u32 val;

Annotation

Implementation Notes