drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c
Extension
.c
Size
1441 bytes
Lines
64
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) 2021 MediaTek Inc. */

#include "mt7921.h"
#include "mcu.h"

int mt7921e_driver_own(struct mt792x_dev *dev)
{
	u32 reg = mt7921_reg_map_l1(dev, MT_TOP_LPCR_HOST_BAND0);

	mt76_wr(dev, reg, MT_TOP_LPCR_HOST_DRV_OWN);
	if (!mt76_poll_msec(dev, reg, MT_TOP_LPCR_HOST_FW_OWN,
			    0, 500)) {
		dev_err(dev->mt76.dev, "Timeout for driver own\n");
		return -EIO;
	}

	return 0;
}

static int
mt7921_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
			int cmd, int *seq)
{
	struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
	enum mt76_mcuq_id txq = MT_MCUQ_WM;
	int ret;

	ret = mt76_connac2_mcu_fill_message(mdev, skb, cmd, seq);
	if (ret)
		return ret;

	mdev->mcu.timeout = 3 * HZ;

	if (cmd == MCU_CMD(FW_SCATTER))
		txq = MT_MCUQ_FWDL;

	return mt76_tx_queue_skb_raw(dev, mdev->q_mcu[txq], skb, 0);
}

int mt7921e_mcu_init(struct mt792x_dev *dev)
{
	static const struct mt76_mcu_ops mt7921_mcu_ops = {
		.headroom = sizeof(struct mt76_connac2_mcu_txd),
		.mcu_skb_send_msg = mt7921_mcu_send_message,
		.mcu_parse_response = mt7921_mcu_parse_response,
	};
	int err;

	dev->mt76.mcu_ops = &mt7921_mcu_ops;

	err = mt7921e_driver_own(dev);
	if (err)
		return err;

	mt76_rmw_field(dev, MT_PCIE_MAC_PM, MT_PCIE_MAC_PM_L0S_DIS, 1);

	err = mt7921_run_firmware(dev);

	mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_FWDL], false);

	return err;
}

Annotation

Implementation Notes