1 files changed, 556 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
new file mode 100644
index 0000000..dc77307
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
@@ -0,0 +1,556 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/irq.h>
+
+#include "mt76x02.h"
+#include "mt76x02_mcu.h"
+#include "mt76x02_trace.h"
+
+static void mt76x02_pre_tbtt_tasklet(unsigned long arg)
+{
+	struct mt76x02_dev *dev = (struct mt76x02_dev *)arg;
+	struct mt76_queue *q = dev->mt76.q_tx[MT_TXQ_PSD].q;
+	struct beacon_bc_data data = {};
+	struct sk_buff *skb;
+	int i;
+
+	if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+		return;
+
+	mt76x02_resync_beacon_timer(dev);
+
+	ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
+		IEEE80211_IFACE_ITER_RESUME_ALL,
+		mt76x02_update_beacon_iter, dev);
+
+	mt76_csa_check(&dev->mt76);
+
+	if (dev->mt76.csa_complete)
+		return;
+
+	mt76x02_enqueue_buffered_bc(dev, &data, 8);
+
+	if (!skb_queue_len(&data.q))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(data.tail); i++) {
+		if (!data.tail[i])
+			continue;
+
+		mt76_skb_set_moredata(data.tail[i], false);
+	}
+
+	spin_lock_bh(&q->lock);
+	while ((skb = __skb_dequeue(&data.q)) != NULL) {
+		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+		struct ieee80211_vif *vif = info->control.vif;
+		struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
+
+		mt76_tx_queue_skb(dev, MT_TXQ_PSD, skb, &mvif->group_wcid,
+				  NULL);
+	}
+	spin_unlock_bh(&q->lock);
+}
+
+static void mt76x02e_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
+{
+	if (en)
+		tasklet_enable(&dev->mt76.pre_tbtt_tasklet);
+	else
+		tasklet_disable(&dev->mt76.pre_tbtt_tasklet);
+}
+
+static void mt76x02e_beacon_enable(struct mt76x02_dev *dev, bool en)
+{
+	mt76_rmw_field(dev, MT_INT_TIMER_EN, MT_INT_TIMER_EN_PRE_TBTT_EN, en);
+	if (en)
+		mt76x02_irq_enable(dev, MT_INT_PRE_TBTT | MT_INT_TBTT);
+	else
+		mt76x02_irq_disable(dev, MT_INT_PRE_TBTT | MT_INT_TBTT);
+}
+
+void mt76x02e_init_beacon_config(struct mt76x02_dev *dev)
+{
+	static const struct mt76x02_beacon_ops beacon_ops = {
+		.nslots = 8,
+		.slot_size = 1024,
+		.pre_tbtt_enable = mt76x02e_pre_tbtt_enable,
+		.beacon_enable = mt76x02e_beacon_enable,
+	};
+
+	dev->beacon_ops = &beacon_ops;
+
+	/* Fire a pre-TBTT interrupt 8 ms before TBTT */
+	mt76_rmw_field(dev, MT_INT_TIMER_CFG, MT_INT_TIMER_CFG_PRE_TBTT,
+		       8 << 4);
+	mt76_rmw_field(dev, MT_INT_TIMER_CFG, MT_INT_TIMER_CFG_GP_TIMER,
+		       MT_DFS_GP_INTERVAL);
+	mt76_wr(dev, MT_INT_TIMER_EN, 0);
+
+	mt76x02_init_beacon_config(dev);
+}
+EXPORT_SYMBOL_GPL(mt76x02e_init_beacon_config);
+
+static int
+mt76x02_init_tx_queue(struct mt76x02_dev *dev, struct mt76_sw_queue *q,
+		      int idx, int n_desc)
+{
+	struct mt76_queue *hwq;
+	int err;
+
+	hwq = devm_kzalloc(dev->mt76.dev, sizeof(*hwq), GFP_KERNEL);
+	if (!hwq)
+		return -ENOMEM;
+
+	err = mt76_queue_alloc(dev, hwq, idx, n_desc, 0, MT_TX_RING_BASE);
+	if (err < 0)
+		return err;
+
+	INIT_LIST_HEAD(&q->swq);
+	q->q = hwq;
+
+	mt76x02_irq_enable(dev, MT_INT_TX_DONE(idx));
+
+	return 0;
+}
+
+static int
+mt76x02_init_rx_queue(struct mt76x02_dev *dev, struct mt76_queue *q,
+		      int idx, int n_desc, int bufsize)
+{
+	int err;
+
+	err = mt76_queue_alloc(dev, q, idx, n_desc, bufsize,
+			       MT_RX_RING_BASE);
+	if (err < 0)
+		return err;
+
+	mt76x02_irq_enable(dev, MT_INT_RX_DONE(idx));
+
+	return 0;
+}
+
+static void mt76x02_process_tx_status_fifo(struct mt76x02_dev *dev)
+{
+	struct mt76x02_tx_status stat;
+	u8 update = 1;
+
+	while (kfifo_get(&dev->txstatus_fifo, &stat))
+		mt76x02_send_tx_status(dev, &stat, &update);
+}
+
+static void mt76x02_tx_tasklet(unsigned long data)
+{
+	struct mt76x02_dev *dev = (struct mt76x02_dev *)data;
+
+	mt76x02_mac_poll_tx_status(dev, false);
+	mt76x02_process_tx_status_fifo(dev);
+
+	mt76_txq_schedule_all(&dev->mt76);
+}
+
+static int mt76x02_poll_tx(struct napi_struct *napi, int budget)
+{
+	struct mt76x02_dev *dev = container_of(napi, struct mt76x02_dev,
+					       mt76.tx_napi);
+	int i;
+
+	mt76x02_mac_poll_tx_status(dev, false);
+
+	for (i = MT_TXQ_MCU; i >= 0; i--)
+		mt76_queue_tx_cleanup(dev, i, false);
+
+	if (napi_complete_done(napi, 0))
+		mt76x02_irq_enable(dev, MT_INT_TX_DONE_ALL);
+
+	for (i = MT_TXQ_MCU; i >= 0; i--)
+		mt76_queue_tx_cleanup(dev, i, false);
+
+	tasklet_schedule(&dev->mt76.tx_tasklet);
+
+	return 0;
+}
+
+int mt76x02_dma_init(struct mt76x02_dev *dev)
+{
+	struct mt76_txwi_cache __maybe_unused *t;
+	int i, ret, fifo_size;
+	struct mt76_queue *q;
+	void *status_fifo;
+
+	BUILD_BUG_ON(sizeof(struct mt76x02_rxwi) > MT_RX_HEADROOM);
+
+	fifo_size = roundup_pow_of_two(32 * sizeof(struct mt76x02_tx_status));
+	status_fifo = devm_kzalloc(dev->mt76.dev, fifo_size, GFP_KERNEL);
+	if (!status_fifo)
+		return -ENOMEM;
+
+	tasklet_init(&dev->mt76.tx_tasklet, mt76x02_tx_tasklet,
+		     (unsigned long)dev);
+	tasklet_init(&dev->mt76.pre_tbtt_tasklet, mt76x02_pre_tbtt_tasklet,
+		     (unsigned long)dev);
+
+	spin_lock_init(&dev->txstatus_fifo_lock);
+	kfifo_init(&dev->txstatus_fifo, status_fifo, fifo_size);
+
+	mt76_dma_attach(&dev->mt76);
+
+	mt76_wr(dev, MT_WPDMA_RST_IDX, ~0);
+
+	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+		ret = mt76x02_init_tx_queue(dev, &dev->mt76.q_tx[i],
+					    mt76_ac_to_hwq(i),
+					    MT_TX_RING_SIZE);
+		if (ret)
+			return ret;
+	}
+
+	ret = mt76x02_init_tx_queue(dev, &dev->mt76.q_tx[MT_TXQ_PSD],
+				    MT_TX_HW_QUEUE_MGMT, MT_TX_RING_SIZE);
+	if (ret)
+		return ret;
+
+	ret = mt76x02_init_tx_queue(dev, &dev->mt76.q_tx[MT_TXQ_MCU],
+				    MT_TX_HW_QUEUE_MCU, MT_MCU_RING_SIZE);
+	if (ret)
+		return ret;
+
+	ret = mt76x02_init_rx_queue(dev, &dev->mt76.q_rx[MT_RXQ_MCU], 1,
+				    MT_MCU_RING_SIZE, MT_RX_BUF_SIZE);
+	if (ret)
+		return ret;
+
+	q = &dev->mt76.q_rx[MT_RXQ_MAIN];
+	q->buf_offset = MT_RX_HEADROOM - sizeof(struct mt76x02_rxwi);
+	ret = mt76x02_init_rx_queue(dev, q, 0, MT76X02_RX_RING_SIZE,
+				    MT_RX_BUF_SIZE);
+	if (ret)
+		return ret;
+
+	ret = mt76_init_queues(dev);
+	if (ret)
+		return ret;
+
+	netif_tx_napi_add(&dev->mt76.napi_dev, &dev->mt76.tx_napi,
+			  mt76x02_poll_tx, NAPI_POLL_WEIGHT);
+	napi_enable(&dev->mt76.tx_napi);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt76x02_dma_init);
+
+void mt76x02_rx_poll_complete(struct mt76_dev *mdev, enum mt76_rxq_id q)
+{
+	struct mt76x02_dev *dev;
+
+	dev = container_of(mdev, struct mt76x02_dev, mt76);
+	mt76x02_irq_enable(dev, MT_INT_RX_DONE(q));
+}
+EXPORT_SYMBOL_GPL(mt76x02_rx_poll_complete);
+
+irqreturn_t mt76x02_irq_handler(int irq, void *dev_instance)
+{
+	struct mt76x02_dev *dev = dev_instance;
+	u32 intr;
+
+	intr = mt76_rr(dev, MT_INT_SOURCE_CSR);
+	mt76_wr(dev, MT_INT_SOURCE_CSR, intr);
+
+	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mt76.state))
+		return IRQ_NONE;
+
+	trace_dev_irq(dev, intr, dev->mt76.mmio.irqmask);
+
+	intr &= dev->mt76.mmio.irqmask;
+
+	if (intr & MT_INT_RX_DONE(0)) {
+		mt76x02_irq_disable(dev, MT_INT_RX_DONE(0));
+		napi_schedule(&dev->mt76.napi[0]);
+	}
+
+	if (intr & MT_INT_RX_DONE(1)) {
+		mt76x02_irq_disable(dev, MT_INT_RX_DONE(1));
+		napi_schedule(&dev->mt76.napi[1]);
+	}
+
+	if (intr & MT_INT_PRE_TBTT)
+		tasklet_schedule(&dev->mt76.pre_tbtt_tasklet);
+
+	/* send buffered multicast frames now */
+	if (intr & MT_INT_TBTT) {
+		if (dev->mt76.csa_complete)
+			mt76_csa_finish(&dev->mt76);
+		else
+			mt76_queue_kick(dev, dev->mt76.q_tx[MT_TXQ_PSD].q);
+	}
+
+	if (intr & MT_INT_TX_STAT)
+		mt76x02_mac_poll_tx_status(dev, true);
+
+	if (intr & (MT_INT_TX_STAT | MT_INT_TX_DONE_ALL)) {
+		mt76x02_irq_disable(dev, MT_INT_TX_DONE_ALL);
+		napi_schedule(&dev->mt76.tx_napi);
+	}
+
+	if (intr & MT_INT_GPTIMER) {
+		mt76x02_irq_disable(dev, MT_INT_GPTIMER);
+		tasklet_schedule(&dev->dfs_pd.dfs_tasklet);
+	}
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_GPL(mt76x02_irq_handler);
+
+static void mt76x02_dma_enable(struct mt76x02_dev *dev)
+{
+	u32 val;
+
+	mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX);
+	mt76x02_wait_for_wpdma(&dev->mt76, 1000);
+	usleep_range(50, 100);
+
+	val = FIELD_PREP(MT_WPDMA_GLO_CFG_DMA_BURST_SIZE, 3) |
+	      MT_WPDMA_GLO_CFG_TX_DMA_EN |
+	      MT_WPDMA_GLO_CFG_RX_DMA_EN;
+	mt76_set(dev, MT_WPDMA_GLO_CFG, val);
+	mt76_clear(dev, MT_WPDMA_GLO_CFG,
+		   MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE);
+}
+
+void mt76x02_dma_cleanup(struct mt76x02_dev *dev)
+{
+	tasklet_kill(&dev->mt76.tx_tasklet);
+	mt76_dma_cleanup(&dev->mt76);
+}
+EXPORT_SYMBOL_GPL(mt76x02_dma_cleanup);
+
+void mt76x02_dma_disable(struct mt76x02_dev *dev)
+{
+	u32 val = mt76_rr(dev, MT_WPDMA_GLO_CFG);
+
+	val &= MT_WPDMA_GLO_CFG_DMA_BURST_SIZE |
+	       MT_WPDMA_GLO_CFG_BIG_ENDIAN |
+	       MT_WPDMA_GLO_CFG_HDR_SEG_LEN;
+	val |= MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE;
+	mt76_wr(dev, MT_WPDMA_GLO_CFG, val);
+}
+EXPORT_SYMBOL_GPL(mt76x02_dma_disable);
+
+void mt76x02_mac_start(struct mt76x02_dev *dev)
+{
+	mt76x02_dma_enable(dev);
+	mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter);
+	mt76_wr(dev, MT_MAC_SYS_CTRL,
+		MT_MAC_SYS_CTRL_ENABLE_TX |
+		MT_MAC_SYS_CTRL_ENABLE_RX);
+	mt76x02_irq_enable(dev,
+			   MT_INT_RX_DONE_ALL | MT_INT_TX_DONE_ALL |
+			   MT_INT_TX_STAT);
+}
+EXPORT_SYMBOL_GPL(mt76x02_mac_start);
+
+static bool mt76x02_tx_hang(struct mt76x02_dev *dev)
+{
+	u32 dma_idx, prev_dma_idx;
+	struct mt76_queue *q;
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		q = dev->mt76.q_tx[i].q;
+
+		if (!q->queued)
+			continue;
+
+		prev_dma_idx = dev->mt76.tx_dma_idx[i];
+		dma_idx = readl(&q->regs->dma_idx);
+		dev->mt76.tx_dma_idx[i] = dma_idx;
+
+		if (prev_dma_idx == dma_idx)
+			break;
+	}
+
+	return i < 4;
+}
+
+static void mt76x02_key_sync(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+			     struct ieee80211_sta *sta,
+			     struct ieee80211_key_conf *key, void *data)
+{
+	struct mt76x02_dev *dev = hw->priv;
+	struct mt76_wcid *wcid;
+
+	if (!sta)
+		return;
+
+	wcid = (struct mt76_wcid *)sta->drv_priv;
+
+	if (wcid->hw_key_idx != key->keyidx || wcid->sw_iv)
+		return;
+
+	mt76x02_mac_wcid_sync_pn(dev, wcid->idx, key);
+}
+
+static void mt76x02_reset_state(struct mt76x02_dev *dev)
+{
+	int i;
+
+	lockdep_assert_held(&dev->mt76.mutex);
+
+	clear_bit(MT76_STATE_RUNNING, &dev->mt76.state);
+
+	rcu_read_lock();
+	ieee80211_iter_keys_rcu(dev->mt76.hw, NULL, mt76x02_key_sync, NULL);
+	rcu_read_unlock();
+
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.wcid); i++) {
+		struct ieee80211_sta *sta;
+		struct ieee80211_vif *vif;
+		struct mt76x02_sta *msta;
+		struct mt76_wcid *wcid;
+		void *priv;
+
+		wcid = rcu_dereference_protected(dev->mt76.wcid[i],
+					lockdep_is_held(&dev->mt76.mutex));
+		if (!wcid)
+			continue;
+
+		priv = msta = container_of(wcid, struct mt76x02_sta, wcid);
+		sta = container_of(priv, struct ieee80211_sta, drv_priv);
+
+		priv = msta->vif;
+		vif = container_of(priv, struct ieee80211_vif, drv_priv);
+
+		__mt76_sta_remove(&dev->mt76, vif, sta);
+		memset(msta, 0, sizeof(*msta));
+	}
+
+	dev->vif_mask = 0;
+	dev->mt76.beacon_mask = 0;
+}
+
+static void mt76x02_watchdog_reset(struct mt76x02_dev *dev)
+{
+	u32 mask = dev->mt76.mmio.irqmask;
+	bool restart = dev->mt76.mcu_ops->mcu_restart;
+	int i;
+
+	ieee80211_stop_queues(dev->mt76.hw);
+	set_bit(MT76_RESET, &dev->mt76.state);
+
+	tasklet_disable(&dev->mt76.pre_tbtt_tasklet);
+	tasklet_disable(&dev->mt76.tx_tasklet);
+	napi_disable(&dev->mt76.tx_napi);
+
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.napi); i++)
+		napi_disable(&dev->mt76.napi[i]);
+
+	mutex_lock(&dev->mt76.mutex);
+
+	if (restart)
+		mt76x02_reset_state(dev);
+
+	if (dev->mt76.beacon_mask)
+		mt76_clear(dev, MT_BEACON_TIME_CFG,
+			   MT_BEACON_TIME_CFG_BEACON_TX |
+			   MT_BEACON_TIME_CFG_TBTT_EN);
+
+	mt76x02_irq_disable(dev, mask);
+
+	/* perform device reset */
+	mt76_clear(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN);
+	mt76_wr(dev, MT_MAC_SYS_CTRL, 0);
+	mt76_clear(dev, MT_WPDMA_GLO_CFG,
+		   MT_WPDMA_GLO_CFG_TX_DMA_EN | MT_WPDMA_GLO_CFG_RX_DMA_EN);
+	usleep_range(5000, 10000);
+	mt76_wr(dev, MT_INT_SOURCE_CSR, 0xffffffff);
+
+	/* let fw reset DMA */
+	mt76_set(dev, 0x734, 0x3);
+
+	if (restart)
+		mt76_mcu_restart(dev);
+
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.q_tx); i++)
+		mt76_queue_tx_cleanup(dev, i, true);
+
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.q_rx); i++)
+		mt76_queue_rx_reset(dev, i);
+
+	mt76x02_mac_start(dev);
+
+	if (dev->ed_monitor)
+		mt76_set(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN);
+
+	if (dev->mt76.beacon_mask && !restart)
+		mt76_set(dev, MT_BEACON_TIME_CFG,
+			 MT_BEACON_TIME_CFG_BEACON_TX |
+			 MT_BEACON_TIME_CFG_TBTT_EN);
+
+	mt76x02_irq_enable(dev, mask);
+
+	mutex_unlock(&dev->mt76.mutex);
+
+	clear_bit(MT76_RESET, &dev->mt76.state);
+
+	tasklet_enable(&dev->mt76.tx_tasklet);
+	napi_enable(&dev->mt76.tx_napi);
+	napi_schedule(&dev->mt76.tx_napi);
+
+	tasklet_enable(&dev->mt76.pre_tbtt_tasklet);
+
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.napi); i++) {
+		napi_enable(&dev->mt76.napi[i]);
+		napi_schedule(&dev->mt76.napi[i]);
+	}
+
+	if (restart) {
+		mt76x02_mcu_function_select(dev, Q_SELECT, 1);
+		ieee80211_restart_hw(dev->mt76.hw);
+	} else {
+		ieee80211_wake_queues(dev->mt76.hw);
+		mt76_txq_schedule_all(&dev->mt76);
+	}
+}
+
+static void mt76x02_check_tx_hang(struct mt76x02_dev *dev)
+{
+	if (mt76x02_tx_hang(dev)) {
+		if (++dev->tx_hang_check >= MT_TX_HANG_TH)
+			goto restart;
+	} else {
+		dev->tx_hang_check = 0;
+	}
+
+	if (dev->mcu_timeout)
+		goto restart;
+
+	return;
+
+restart:
+	mt76x02_watchdog_reset(dev);
+
+	mutex_lock(&dev->mt76.mmio.mcu.mutex);
+	dev->mcu_timeout = 0;
+	mutex_unlock(&dev->mt76.mmio.mcu.mutex);
+
+	dev->tx_hang_reset++;
+	dev->tx_hang_check = 0;
+	memset(dev->mt76.tx_dma_idx, 0xff,
+	       sizeof(dev->mt76.tx_dma_idx));
+}
+
+void mt76x02_wdt_work(struct work_struct *work)
+{
+	struct mt76x02_dev *dev = container_of(work, struct mt76x02_dev,
+					       wdt_work.work);
+
+	mt76x02_check_tx_hang(dev);
+
+	ieee80211_queue_delayed_work(mt76_hw(dev), &dev->wdt_work,
+				     MT_WATCHDOG_TIME);
+}