drivers/net/wireless/mediatek/mt76/mt76x2/pci_mcu.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt76x2/pci_mcu.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt76x2/pci_mcu.c
Extension
.c
Size
4543 bytes
Lines
199
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) 2016 Felix Fietkau <nbd@nbd.name>
 */

#include <linux/kernel.h>
#include <linux/firmware.h>
#include <linux/delay.h>

#include "mt76x2.h"
#include "mcu.h"
#include "eeprom.h"

static int
mt76pci_load_rom_patch(struct mt76x02_dev *dev)
{
	const struct firmware *fw = NULL;
	struct mt76x02_patch_header *hdr;
	bool rom_protect = !is_mt7612(dev);
	int len, ret = 0;
	__le32 *cur;
	u32 patch_mask, patch_reg;

	if (rom_protect && !mt76_poll(dev, MT_MCU_SEMAPHORE_03, 1, 1, 600)) {
		dev_err(dev->mt76.dev,
			"Could not get hardware semaphore for ROM PATCH\n");
		return -ETIMEDOUT;
	}

	if (mt76xx_rev(dev) >= MT76XX_REV_E3) {
		patch_mask = BIT(0);
		patch_reg = MT_MCU_CLOCK_CTL;
	} else {
		patch_mask = BIT(1);
		patch_reg = MT_MCU_COM_REG0;
	}

	if (rom_protect && (mt76_rr(dev, patch_reg) & patch_mask)) {
		dev_info(dev->mt76.dev, "ROM patch already applied\n");
		goto out;
	}

	ret = request_firmware(&fw, MT7662_ROM_PATCH, dev->mt76.dev);
	if (ret)
		goto out;

	if (!fw || !fw->data || fw->size <= sizeof(*hdr)) {
		ret = -EIO;
		dev_err(dev->mt76.dev, "Failed to load firmware\n");
		goto out;
	}

	hdr = (struct mt76x02_patch_header *)fw->data;
	dev_info(dev->mt76.dev, "ROM patch build: %.15s\n", hdr->build_time);

	mt76_wr(dev, MT_MCU_PCIE_REMAP_BASE4, MT_MCU_ROM_PATCH_OFFSET);

	cur = (__le32 *)(fw->data + sizeof(*hdr));
	len = fw->size - sizeof(*hdr);
	mt76_wr_copy(dev, MT_MCU_ROM_PATCH_ADDR, cur, len);

	mt76_wr(dev, MT_MCU_PCIE_REMAP_BASE4, 0);

	/* Trigger ROM */
	mt76_wr(dev, MT_MCU_INT_LEVEL, 4);

	if (!mt76_poll_msec(dev, patch_reg, patch_mask, patch_mask, 2000)) {
		dev_err(dev->mt76.dev, "Failed to load ROM patch\n");
		ret = -ETIMEDOUT;
	}

out:
	/* release semaphore */
	if (rom_protect)
		mt76_wr(dev, MT_MCU_SEMAPHORE_03, 1);
	release_firmware(fw);
	return ret;
}

static int
mt76pci_load_firmware(struct mt76x02_dev *dev)
{
	const struct firmware *fw;
	const struct mt76x02_fw_header *hdr;
	int len, ret;
	__le32 *cur;
	u32 offset, val;

	ret = request_firmware(&fw, MT7662_FIRMWARE, dev->mt76.dev);
	if (ret)

Annotation

Implementation Notes