mt76/mt7921/pci.c

// SPDX-License-Identifier: ISC
/* Copyright (C) 2020 MediaTek Inc.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>

#include "mt7921.h"
#include "mac.h"
#include "../trace.h"

static const struct pci_device_id mt7921_pci_device_table[] = {
	{ PCI_DEVICE(0x14c3, 0x7961) },
	{ },
};

static void
mt7921_rx_poll_complete(struct mt76_dev *mdev, enum mt76_rxq_id q)
{
	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);

	if (q == MT_RXQ_MAIN)
		mt7921_irq_enable(dev, MT_INT_RX_DONE_DATA);
	else if (q == MT_RXQ_MCU_WA)
		mt7921_irq_enable(dev, MT_INT_RX_DONE_WM2);
	else
		mt7921_irq_enable(dev, MT_INT_RX_DONE_WM);
}

static irqreturn_t mt7921_irq_handler(int irq, void *dev_instance)
{
	struct mt7921_dev *dev = dev_instance;

	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);

	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mphy.state))
		return IRQ_NONE;

	tasklet_schedule(&dev->irq_tasklet);

	return IRQ_HANDLED;
}

static void mt7921_irq_tasklet(unsigned long data)
{
	struct mt7921_dev *dev = (struct mt7921_dev *)data;
	u32 intr, mask = 0;

	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);

	intr = mt76_rr(dev, MT_WFDMA0_HOST_INT_STA);
	intr &= dev->mt76.mmio.irqmask;
	mt76_wr(dev, MT_WFDMA0_HOST_INT_STA, intr);

	trace_dev_irq(&dev->mt76, intr, dev->mt76.mmio.irqmask);

	mask |= intr & MT_INT_RX_DONE_ALL;
	if (intr & MT_INT_TX_DONE_MCU)
		mask |= MT_INT_TX_DONE_MCU;

	mt76_set_irq_mask(&dev->mt76, MT_WFDMA0_HOST_INT_ENA, mask, 0);

	if (intr & MT_INT_TX_DONE_ALL)
		napi_schedule(&dev->mt76.tx_napi);

	if (intr & MT_INT_RX_DONE_WM)
		napi_schedule(&dev->mt76.napi[MT_RXQ_MCU]);

	if (intr & MT_INT_RX_DONE_WM2)
		napi_schedule(&dev->mt76.napi[MT_RXQ_MCU_WA]);

	if (intr & MT_INT_RX_DONE_DATA)
		napi_schedule(&dev->mt76.napi[MT_RXQ_MAIN]);
}

static int mt7921_pci_probe(struct pci_dev *pdev,
			    const struct pci_device_id *id)
{
	static const struct mt76_driver_ops drv_ops = {
		/* txwi_size = txd size + txp size */
		.txwi_size = MT_TXD_SIZE + sizeof(struct mt7921_txp_common),
		.drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ |
			     MT_DRV_AMSDU_OFFLOAD,
		.survey_flags = SURVEY_INFO_TIME_TX |
				SURVEY_INFO_TIME_RX |
				SURVEY_INFO_TIME_BSS_RX,
		.tx_prepare_skb = mt7921_tx_prepare_skb,
		.tx_complete_skb = mt7921_tx_complete_skb,
		.rx_skb = mt7921_queue_rx_skb,
		.rx_poll_complete = mt7921_rx_poll_complete,
		.sta_ps = mt7921_sta_ps,
		.sta_add = mt7921_mac_sta_add,
		.sta_remove = mt7921_mac_sta_remove,
		.update_survey = mt7921_update_channel,
	};
	struct mt7921_dev *dev;
	struct mt76_dev *mdev;
	int ret;

	ret = pcim_enable_device(pdev);
	if (ret)
		return ret;

	ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
	if (ret)
		return ret;

	pci_set_master(pdev);

	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY);
	if (ret < 0)
		return ret;

	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	if (ret)
		goto err_free_pci_vec;

	mt76_pci_disable_aspm(pdev);

	mdev = mt76_alloc_device(&pdev->dev, sizeof(*dev), &mt7921_ops,
				 &drv_ops);
	if (!mdev) {
		ret = -ENOMEM;
		goto err_free_pci_vec;
	}

	dev = container_of(mdev, struct mt7921_dev, mt76);

	mt76_mmio_init(&dev->mt76, pcim_iomap_table(pdev)[0]);
	tasklet_init(&dev->irq_tasklet, mt7921_irq_tasklet, (unsigned long)dev);
	mdev->rev = (mt7921_l1_rr(dev, MT_HW_CHIPID) << 16) |
		    (mt7921_l1_rr(dev, MT_HW_REV) & 0xff);
	dev_err(mdev->dev, "ASIC revision: %04x\n", mdev->rev);

	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);

	mt7921_l1_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);

	ret = devm_request_irq(mdev->dev, pdev->irq, mt7921_irq_handler,
			       IRQF_SHARED, KBUILD_MODNAME, dev);
	if (ret)
		goto err_free_dev;

	ret = mt7921_register_device(dev);
	if (ret)
		goto err_free_dev;

	return 0;

err_free_dev:
	mt76_free_device(&dev->mt76);
err_free_pci_vec:
	pci_free_irq_vectors(pdev);

	return ret;
}

static void mt7921_pci_remove(struct pci_dev *pdev)
{
	struct mt76_dev *mdev = pci_get_drvdata(pdev);
	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);

	mt7921_unregister_device(dev);
	devm_free_irq(&pdev->dev, pdev->irq, dev);
	pci_free_irq_vectors(pdev);
}

struct pci_driver mt7921_pci_driver = {
	.name		= KBUILD_MODNAME,
	.id_table	= mt7921_pci_device_table,
	.probe		= mt7921_pci_probe,
	.remove		= mt7921_pci_remove,
};

module_pci_driver(mt7921_pci_driver);

MODULE_DEVICE_TABLE(pci, mt7921_pci_device_table);
MODULE_FIRMWARE(MT7921_FIRMWARE_WM);
MODULE_FIRMWARE(MT7921_ROM_PATCH);
MODULE_AUTHOR("Sean Wang <[email protected]>");
MODULE_AUTHOR("Lorenzo Bianconi <[email protected]>");
MODULE_LICENSE("Dual BSD/GPL");