mt76: mt7921: refactor mac.c to be bus independent

This is a preliminary patch to introduce mt7921s support.

Split out a new pci_mac.c from mac.c to make mac.c reusable between
mt7921s and mt7921e.

Tested-by: Deren Wu <deren.wu@mediatek.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 346 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c
new file mode 100644
index 000000000000..312e42db40bd
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2021 MediaTek Inc. */
+
+#include "mt7921.h"
+#include "../dma.h"
+#include "mac.h"
+
+static void
+mt7921_write_hw_txp(struct mt7921_dev *dev, struct mt76_tx_info *tx_info,
+		    void *txp_ptr, u32 id)
+{
+	struct mt7921_hw_txp *txp = txp_ptr;
+	struct mt7921_txp_ptr *ptr = &txp->ptr[0];
+	int i, nbuf = tx_info->nbuf - 1;
+
+	tx_info->buf[0].len = MT_TXD_SIZE + sizeof(*txp);
+	tx_info->nbuf = 1;
+
+	txp->msdu_id[0] = cpu_to_le16(id | MT_MSDU_ID_VALID);
+
+	for (i = 0; i < nbuf; i++) {
+		u16 len = tx_info->buf[i + 1].len & MT_TXD_LEN_MASK;
+		u32 addr = tx_info->buf[i + 1].addr;
+
+		if (i == nbuf - 1)
+			len |= MT_TXD_LEN_LAST;
+
+		if (i & 1) {
+			ptr->buf1 = cpu_to_le32(addr);
+			ptr->len1 = cpu_to_le16(len);
+			ptr++;
+		} else {
+			ptr->buf0 = cpu_to_le32(addr);
+			ptr->len0 = cpu_to_le16(len);
+		}
+	}
+}
+
+int mt7921e_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
+			   enum mt76_txq_id qid, struct mt76_wcid *wcid,
+			   struct ieee80211_sta *sta,
+			   struct mt76_tx_info *tx_info)
+{
+	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_info->skb);
+	struct ieee80211_key_conf *key = info->control.hw_key;
+	struct mt76_txwi_cache *t;
+	struct mt7921_txp_common *txp;
+	int id, pid;
+	u8 *txwi = (u8 *)txwi_ptr;
+
+	if (unlikely(tx_info->skb->len <= ETH_HLEN))
+		return -EINVAL;
+
+	if (!wcid)
+		wcid = &dev->mt76.global_wcid;
+
+	t = (struct mt76_txwi_cache *)(txwi + mdev->drv->txwi_size);
+	t->skb = tx_info->skb;
+
+	id = mt76_token_consume(mdev, &t);
+	if (id < 0)
+		return id;
+
+	if (sta) {
+		struct mt7921_sta *msta = (struct mt7921_sta *)sta->drv_priv;
+
+		if (time_after(jiffies, msta->last_txs + HZ / 4)) {
+			info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
+			msta->last_txs = jiffies;
+		}
+	}
+
+	pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
+	mt7921_mac_write_txwi(dev, txwi_ptr, tx_info->skb, wcid, key,
+			      pid, false);
+
+	txp = (struct mt7921_txp_common *)(txwi + MT_TXD_SIZE);
+	memset(txp, 0, sizeof(struct mt7921_txp_common));
+	mt7921_write_hw_txp(dev, tx_info, txp, id);
+
+	tx_info->skb = DMA_DUMMY_DATA;
+
+	return 0;
+}
+
+static void
+mt7921_txp_skb_unmap(struct mt76_dev *dev, struct mt76_txwi_cache *t)
+{
+	struct mt7921_txp_common *txp;
+	int i;
+
+	txp = mt7921_txwi_to_txp(dev, t);
+
+	for (i = 0; i < ARRAY_SIZE(txp->hw.ptr); i++) {
+		struct mt7921_txp_ptr *ptr = &txp->hw.ptr[i];
+		bool last;
+		u16 len;
+
+		len = le16_to_cpu(ptr->len0);
+		last = len & MT_TXD_LEN_LAST;
+		len &= MT_TXD_LEN_MASK;
+		dma_unmap_single(dev->dev, le32_to_cpu(ptr->buf0), len,
+				 DMA_TO_DEVICE);
+		if (last)
+			break;
+
+		len = le16_to_cpu(ptr->len1);
+		last = len & MT_TXD_LEN_LAST;
+		len &= MT_TXD_LEN_MASK;
+		dma_unmap_single(dev->dev, le32_to_cpu(ptr->buf1), len,
+				 DMA_TO_DEVICE);
+		if (last)
+			break;
+	}
+}
+
+static void
+mt7921_txwi_free(struct mt7921_dev *dev, struct mt76_txwi_cache *t,
+		 struct ieee80211_sta *sta, bool clear_status,
+		 struct list_head *free_list)
+{
+	struct mt76_dev *mdev = &dev->mt76;
+	__le32 *txwi;
+	u16 wcid_idx;
+
+	mt7921_txp_skb_unmap(mdev, t);
+	if (!t->skb)
+		goto out;
+
+	txwi = (__le32 *)mt76_get_txwi_ptr(mdev, t);
+	if (sta) {
+		struct mt76_wcid *wcid = (struct mt76_wcid *)sta->drv_priv;
+
+		if (likely(t->skb->protocol != cpu_to_be16(ETH_P_PAE)))
+			mt7921_tx_check_aggr(sta, txwi);
+
+		wcid_idx = wcid->idx;
+	} else {
+		wcid_idx = FIELD_GET(MT_TXD1_WLAN_IDX, le32_to_cpu(txwi[1]));
+	}
+
+	__mt76_tx_complete_skb(mdev, wcid_idx, t->skb, free_list);
+
+out:
+	t->skb = NULL;
+	mt76_put_txwi(mdev, t);
+}
+
+static void
+mt7921_mac_tx_free(struct mt7921_dev *dev, struct sk_buff *skb)
+{
+	struct mt7921_tx_free *free = (struct mt7921_tx_free *)skb->data;
+	struct mt76_dev *mdev = &dev->mt76;
+	struct mt76_txwi_cache *txwi;
+	struct ieee80211_sta *sta = NULL;
+	LIST_HEAD(free_list);
+	struct sk_buff *tmp;
+	bool wake = false;
+	u8 i, count;
+
+	/* clean DMA queues and unmap buffers first */
+	mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_PSD], false);
+	mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_BE], false);
+
+	/* TODO: MT_TX_FREE_LATENCY is msdu time from the TXD is queued into PLE,
+	 * to the time ack is received or dropped by hw (air + hw queue time).
+	 * Should avoid accessing WTBL to get Tx airtime, and use it instead.
+	 */
+	count = FIELD_GET(MT_TX_FREE_MSDU_CNT, le16_to_cpu(free->ctrl));
+	for (i = 0; i < count; i++) {
+		u32 msdu, info = le32_to_cpu(free->info[i]);
+		u8 stat;
+
+		/* 1'b1: new wcid pair.
+		 * 1'b0: msdu_id with the same 'wcid pair' as above.
+		 */
+		if (info & MT_TX_FREE_PAIR) {
+			struct mt7921_sta *msta;
+			struct mt76_wcid *wcid;
+			u16 idx;
+
+			count++;
+			idx = FIELD_GET(MT_TX_FREE_WLAN_ID, info);
+			wcid = rcu_dereference(dev->mt76.wcid[idx]);
+			sta = wcid_to_sta(wcid);
+			if (!sta)
+				continue;
+
+			msta = container_of(wcid, struct mt7921_sta, wcid);
+			spin_lock_bh(&dev->sta_poll_lock);
+			if (list_empty(&msta->poll_list))
+				list_add_tail(&msta->poll_list, &dev->sta_poll_list);
+			spin_unlock_bh(&dev->sta_poll_lock);
+			continue;
+		}
+
+		msdu = FIELD_GET(MT_TX_FREE_MSDU_ID, info);
+		stat = FIELD_GET(MT_TX_FREE_STATUS, info);
+
+		txwi = mt76_token_release(mdev, msdu, &wake);
+		if (!txwi)
+			continue;
+
+		mt7921_txwi_free(dev, txwi, sta, stat, &free_list);
+	}
+
+	if (wake)
+		mt76_set_tx_blocked(&dev->mt76, false);
+
+	napi_consume_skb(skb, 1);
+
+	list_for_each_entry_safe(skb, tmp, &free_list, list) {
+		skb_list_del_init(skb);
+		napi_consume_skb(skb, 1);
+	}
+
+	rcu_read_lock();
+	mt7921_mac_sta_poll(dev);
+	rcu_read_unlock();
+
+	mt76_worker_schedule(&dev->mt76.tx_worker);
+}
+
+void mt7921e_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,
+			  struct sk_buff *skb)
+{
+	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
+	__le32 *rxd = (__le32 *)skb->data;
+	enum rx_pkt_type type;
+
+	type = FIELD_GET(MT_RXD0_PKT_TYPE, le32_to_cpu(rxd[0]));
+
+	switch (type) {
+	case PKT_TYPE_TXRX_NOTIFY:
+		mt7921_mac_tx_free(dev, skb);
+		break;
+	default:
+		mt7921_queue_rx_skb(mdev, q, skb);
+		break;
+	}
+}
+
+void mt7921e_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e)
+{
+	if (!e->txwi) {
+		dev_kfree_skb_any(e->skb);
+		return;
+	}
+
+	/* error path */
+	if (e->skb == DMA_DUMMY_DATA) {
+		struct mt76_txwi_cache *t;
+		struct mt7921_txp_common *txp;
+		u16 token;
+
+		txp = mt7921_txwi_to_txp(mdev, e->txwi);
+		token = le16_to_cpu(txp->hw.msdu_id[0]) & ~MT_MSDU_ID_VALID;
+		t = mt76_token_put(mdev, token);
+		e->skb = t ? t->skb : NULL;
+	}
+
+	if (e->skb)
+		mt76_tx_complete_skb(mdev, e->wcid, e->skb);
+}
+
+void mt7921_tx_token_put(struct mt7921_dev *dev)
+{
+	struct mt76_txwi_cache *txwi;
+	int id;
+
+	spin_lock_bh(&dev->mt76.token_lock);
+	idr_for_each_entry(&dev->mt76.token, txwi, id) {
+		mt7921_txwi_free(dev, txwi, NULL, false, NULL);
+		dev->mt76.token_count--;
+	}
+	spin_unlock_bh(&dev->mt76.token_lock);
+	idr_destroy(&dev->mt76.token);
+}
+
+int mt7921e_mac_reset(struct mt7921_dev *dev)
+{
+	int i, err;
+
+	mt76_connac_free_pending_tx_skbs(&dev->pm, NULL);
+
+	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);
+	mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0x0);
+
+	set_bit(MT76_RESET, &dev->mphy.state);
+	set_bit(MT76_MCU_RESET, &dev->mphy.state);
+	wake_up(&dev->mt76.mcu.wait);
+	skb_queue_purge(&dev->mt76.mcu.res_q);
+
+	mt76_txq_schedule_all(&dev->mphy);
+
+	mt76_worker_disable(&dev->mt76.tx_worker);
+	napi_disable(&dev->mt76.napi[MT_RXQ_MAIN]);
+	napi_disable(&dev->mt76.napi[MT_RXQ_MCU]);
+	napi_disable(&dev->mt76.napi[MT_RXQ_MCU_WA]);
+	napi_disable(&dev->mt76.tx_napi);
+
+	mt7921_tx_token_put(dev);
+	idr_init(&dev->mt76.token);
+
+	mt7921_wpdma_reset(dev, true);
+
+	local_bh_disable();
+	mt76_for_each_q_rx(&dev->mt76, i) {
+		napi_enable(&dev->mt76.napi[i]);
+		napi_schedule(&dev->mt76.napi[i]);
+	}
+	local_bh_enable();
+
+	clear_bit(MT76_MCU_RESET, &dev->mphy.state);
+
+	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA,
+		MT_INT_RX_DONE_ALL | MT_INT_TX_DONE_ALL |
+		MT_INT_MCU_CMD);
+	mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);
+
+	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:
+	clear_bit(MT76_RESET, &dev->mphy.state);
+
+	local_bh_disable();
+	napi_enable(&dev->mt76.tx_napi);
+	napi_schedule(&dev->mt76.tx_napi);
+	local_bh_enable();
+
+	mt76_worker_enable(&dev->mt76.tx_worker);
+
+	return err;
+}