drivers/net/wireless/mediatek/mt76/mt76x02_eeprom.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt76x02_eeprom.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt76x02_eeprom.c
Extension
.c
Size
3445 bytes
Lines
148
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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>
 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
 */

#include <linux/unaligned.h>

#include "mt76x02_eeprom.h"

static int
mt76x02_efuse_read(struct mt76x02_dev *dev, u16 addr, u8 *data,
		   enum mt76x02_eeprom_modes mode)
{
	u32 val;
	int i;

	val = mt76_rr(dev, MT_EFUSE_CTRL);
	val &= ~(MT_EFUSE_CTRL_AIN |
		 MT_EFUSE_CTRL_MODE);
	val |= FIELD_PREP(MT_EFUSE_CTRL_AIN, addr & ~0xf);
	val |= FIELD_PREP(MT_EFUSE_CTRL_MODE, mode);
	val |= MT_EFUSE_CTRL_KICK;
	mt76_wr(dev, MT_EFUSE_CTRL, val);

	if (!mt76_poll_msec(dev, MT_EFUSE_CTRL, MT_EFUSE_CTRL_KICK, 0, 1000))
		return -ETIMEDOUT;

	udelay(2);

	val = mt76_rr(dev, MT_EFUSE_CTRL);
	if ((val & MT_EFUSE_CTRL_AOUT) == MT_EFUSE_CTRL_AOUT) {
		memset(data, 0xff, 16);
		return 0;
	}

	for (i = 0; i < 4; i++) {
		val = mt76_rr(dev, MT_EFUSE_DATA(i));
		put_unaligned_le32(val, data + 4 * i);
	}

	return 0;
}

int mt76x02_eeprom_copy(struct mt76x02_dev *dev,
			enum mt76x02_eeprom_field field,
			void *dest, int len)
{
	if (field + len > dev->mt76.eeprom.size)
		return -1;

	memcpy(dest, dev->mt76.eeprom.data + field, len);
	return 0;
}
EXPORT_SYMBOL_GPL(mt76x02_eeprom_copy);

int mt76x02_get_efuse_data(struct mt76x02_dev *dev, u16 base, void *buf,
			   int len, enum mt76x02_eeprom_modes mode)
{
	int ret, i;

	for (i = 0; i + 16 <= len; i += 16) {
		ret = mt76x02_efuse_read(dev, base + i, buf + i, mode);
		if (ret)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(mt76x02_get_efuse_data);

void mt76x02_eeprom_parse_hw_cap(struct mt76x02_dev *dev)
{
	u16 val = mt76x02_eeprom_get(dev, MT_EE_NIC_CONF_0);

	switch (FIELD_GET(MT_EE_NIC_CONF_0_BOARD_TYPE, val)) {
	case BOARD_TYPE_5GHZ:
		dev->mphy.cap.has_5ghz = true;
		break;
	case BOARD_TYPE_2GHZ:
		dev->mphy.cap.has_2ghz = true;
		break;
	default:
		dev->mphy.cap.has_2ghz = true;
		dev->mphy.cap.has_5ghz = true;
		break;
	}
}
EXPORT_SYMBOL_GPL(mt76x02_eeprom_parse_hw_cap);

Annotation

Implementation Notes