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

// SPDX-License-Identifier: BSD-3-Clause-Clear
/* Copyright (C) 2021 MediaTek Inc. */

#include <linux/iopoll.h>
#include <linux/mmc/sdio_func.h>
#include "mt7921.h"
#include "../mt76_connac2_mac.h"
#include "../sdio.h"
#include <linux/mmc/host.h>
#include <linux/kallsyms.h>

static void mt7921s_enable_irq(struct mt76_dev *dev)
{
	struct mt76_sdio *sdio = &dev->sdio;

	sdio_claim_host(sdio->func);
	sdio_writel(sdio->func, WHLPCR_INT_EN_SET, MCR_WHLPCR, NULL);
	sdio_release_host(sdio->func);
}

static void mt7921s_disable_irq(struct mt76_dev *dev)
{
	struct mt76_sdio *sdio = &dev->sdio;

	sdio_claim_host(sdio->func);
	sdio_writel(sdio->func, WHLPCR_INT_EN_CLR, MCR_WHLPCR, NULL);
	sdio_release_host(sdio->func);
}

static u32 mt7921s_read_whcr(struct mt76_dev *dev)
{
	return sdio_readl(dev->sdio.func, MCR_WHCR, NULL);
}

int mt7921s_wfsys_reset(struct mt792x_dev *dev)
{
	struct mt76_sdio *sdio = &dev->mt76.sdio;
	u32 val, status;

	if (atomic_read(&dev->mt76.bus_hung))
		return 0;

	mt7921s_mcu_drv_pmctrl(dev);

	sdio_claim_host(sdio->func);

	val = sdio_readl(sdio->func, MCR_WHCR, NULL);
	val &= ~WF_WHOLE_PATH_RSTB;
	sdio_writel(sdio->func, val, MCR_WHCR, NULL);

	msleep(50);

	val = sdio_readl(sdio->func, MCR_WHCR, NULL);
	val &= ~WF_SDIO_WF_PATH_RSTB;
	sdio_writel(sdio->func, val, MCR_WHCR, NULL);

	usleep_range(1000, 2000);

	val = sdio_readl(sdio->func, MCR_WHCR, NULL);
	val |= WF_WHOLE_PATH_RSTB;
	sdio_writel(sdio->func, val, MCR_WHCR, NULL);

	readx_poll_timeout(mt7921s_read_whcr, &dev->mt76, status,
			   status & WF_RST_DONE, 50000, 2000000);

	sdio_release_host(sdio->func);

	clear_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state);

	/* activate mt7921s again */
	mt7921s_mcu_drv_pmctrl(dev);
	mt76_clear(dev, MT_CONN_STATUS, MT_WIFI_PATCH_DL_STATE);
	mt7921s_mcu_fw_pmctrl(dev);
	mt7921s_mcu_drv_pmctrl(dev);

	return 0;
}

int mt7921s_init_reset(struct mt792x_dev *dev)
{
	set_bit(MT76_MCU_RESET, &dev->mphy.state);

	wake_up(&dev->mt76.mcu.wait);
	skb_queue_purge(&dev->mt76.mcu.res_q);
	wait_event_timeout(dev->mt76.sdio.wait,
			   mt76s_txqs_empty(&dev->mt76), 5 * HZ);
	mt76_worker_disable(&dev->mt76.sdio.txrx_worker);

	mt7921s_disable_irq(&dev->mt76);
	mt7921s_wfsys_reset(dev);

	mt76_worker_enable(&dev->mt76.sdio.txrx_worker);
	clear_bit(MT76_MCU_RESET, &dev->mphy.state);
	mt7921s_enable_irq(&dev->mt76);

	return 0;
}

static struct mt76_sdio *msdio;
static void mt7921s_card_reset(struct work_struct *work)
{
	struct mmc_host *sdio_host = msdio->func->card->host;

	sdio_claim_host(msdio->func);
	sdio_release_irq(msdio->func);
	sdio_release_host(msdio->func);

	mmc_remove_host(sdio_host);
	msleep(50);
	mmc_add_host(sdio_host);
}

static DECLARE_WORK(sdio_reset_work, mt7921s_card_reset);
static int mt7921s_check_bus(struct mt76_dev *dev)
{
	struct mt76_sdio *sdio = &dev->sdio;
	int err;

	sdio_claim_host(sdio->func);
	sdio_readl(dev->sdio.func, MCR_WHCR, &err);
	sdio_release_host(sdio->func);

	return err;
}

static int mt7921s_host_reset(struct mt792x_dev *dev)
{
	struct mt76_dev *mdev = &dev->mt76;
	int err = -1;

	if (!atomic_read(&mdev->bus_hung))
		err = mt7921s_check_bus(&dev->mt76);

	if (err) {
		atomic_set(&mdev->bus_hung, true);
		msdio = &dev->mt76.sdio;
		dev_err(mdev->dev, "SDIO bus problem detected(%d), resetting card!!\n", err);
		schedule_work(&sdio_reset_work);
		return err;
	}

	atomic_set(&mdev->bus_hung, false);

	return 0;
}

int mt7921s_mac_reset(struct mt792x_dev *dev)
{
	int err;

	mt76_connac_free_pending_tx_skbs(&dev->pm, NULL);

	mt7921s_host_reset(dev);
	if (atomic_read(&dev->mt76.bus_hung))
		return 0;

	mt76_txq_schedule_all(&dev->mphy);
	mt76_worker_disable(&dev->mt76.tx_worker);
	set_bit(MT76_MCU_RESET, &dev->mphy.state);
	wake_up(&dev->mt76.mcu.wait);
	skb_queue_purge(&dev->mt76.mcu.res_q);
	wait_event_timeout(dev->mt76.sdio.wait,
			   mt76s_txqs_empty(&dev->mt76), 5 * HZ);
	mt76_worker_disable(&dev->mt76.sdio.txrx_worker);
	mt76_worker_disable(&dev->mt76.sdio.status_worker);
	mt76_worker_disable(&dev->mt76.sdio.net_worker);
	mt76_worker_disable(&dev->mt76.sdio.stat_worker);

	mt7921s_disable_irq(&dev->mt76);
	mt7921s_wfsys_reset(dev);

	mt76_worker_enable(&dev->mt76.sdio.txrx_worker);
	mt76_worker_enable(&dev->mt76.sdio.status_worker);
	mt76_worker_enable(&dev->mt76.sdio.net_worker);
	mt76_worker_enable(&dev->mt76.sdio.stat_worker);

	dev->fw_assert = false;
	clear_bit(MT76_MCU_RESET, &dev->mphy.state);
	mt7921s_enable_irq(&dev->mt76);

	err = mt7921_run_firmware(dev);
	if (err)
		goto out;

	err = mt7921_mcu_set_eeprom(dev);
	if (err)
		goto out;

	err = mt7921_mac_init(dev);
	if (err)
		goto out;

	err = __mt7921_start(&dev->phy);
out:

	mt76_worker_enable(&dev->mt76.tx_worker);

	return err;
}