mt76: mt7921: introduce mt7921e support

Introduce support for mt7921e 802.11ax (Wi-Fi 6) 2x2:2SS chipset.

Co-developed-by: Lorenzo Bianconi <[email protected]>
Signed-off-by: Lorenzo Bianconi <[email protected]>
Co-developed-by: Soul Huang <[email protected]>
Signed-off-by: Soul Huang <[email protected]>
Signed-off-by: Sean Wang <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>

drivers/net/wireless/mediatek/mt76/Kconfig

@@ -33,3 +33,4 @@ source "drivers/net/wireless/mediatek/mt76/mt76x2/Kconfig"
 source "drivers/net/wireless/mediatek/mt76/mt7603/Kconfig"
 source "drivers/net/wireless/mediatek/mt76/mt7615/Kconfig"
 source "drivers/net/wireless/mediatek/mt76/mt7915/Kconfig"
+source "drivers/net/wireless/mediatek/mt76/mt7921/Kconfig"

drivers/net/wireless/mediatek/mt76/Makefile

@@ -34,3 +34,4 @@ obj-$(CONFIG_MT76x2_COMMON) += mt76x2/
 obj-$(CONFIG_MT7603E) += mt7603/
 obj-$(CONFIG_MT7615_COMMON) += mt7615/
 obj-$(CONFIG_MT7915E) += mt7915/
+obj-$(CONFIG_MT7921E) += mt7921/

drivers/net/wireless/mediatek/mt76/mt7921/Kconfig

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: ISC
+config MT7921E
+	tristate "MediaTek MT7921E (PCIe) support"
+	select MT76_CORE
+	depends on MAC80211
+	depends on PCI
+	help
+	  This adds support for MT7921E 802.11ax 2x2:2SS wireless devices.
+
+	  To compile this driver as a module, choose M here.

drivers/net/wireless/mediatek/mt76/mt7921/Makefile

@@ -0,0 +1,5 @@
+#SPDX-License-Identifier: ISC
+
+obj-$(CONFIG_MT7921E) += mt7921e.o
+
+mt7921e-y := pci.o mac.o mcu.o dma.o eeprom.o main.o init.o debugfs.o

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

@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2020 MediaTek Inc. */
+
+#include <linux/etherdevice.h>
+#include "mt7921.h"
+#include "mac.h"
+#include "eeprom.h"
+
+#define CCK_RATE(_idx, _rate) {						\
+	.bitrate = _rate,						\
+	.flags = IEEE80211_RATE_SHORT_PREAMBLE,				\
+	.hw_value = (MT_PHY_TYPE_CCK << 8) | (_idx),			\
+	.hw_value_short = (MT_PHY_TYPE_CCK << 8) | (4 + (_idx)),	\
+}
+
+#define OFDM_RATE(_idx, _rate) {					\
+	.bitrate = _rate,						\
+	.hw_value = (MT_PHY_TYPE_OFDM << 8) | (_idx),			\
+	.hw_value_short = (MT_PHY_TYPE_OFDM << 8) | (_idx),		\
+}
+
+static struct ieee80211_rate mt7921_rates[] = {
+	CCK_RATE(0, 10),
+	CCK_RATE(1, 20),
+	CCK_RATE(2, 55),
+	CCK_RATE(3, 110),
+	OFDM_RATE(11, 60),
+	OFDM_RATE(15, 90),
+	OFDM_RATE(10, 120),
+	OFDM_RATE(14, 180),
+	OFDM_RATE(9,  240),
+	OFDM_RATE(13, 360),
+	OFDM_RATE(8,  480),
+	OFDM_RATE(12, 540),
+};
+
+static const struct ieee80211_iface_limit if_limits[] = {
+	{
+		.max = MT7921_MAX_INTERFACES,
+		.types = BIT(NL80211_IFTYPE_STATION)
+	}
+};
+
+static const struct ieee80211_iface_combination if_comb[] = {
+	{
+		.limits = if_limits,
+		.n_limits = ARRAY_SIZE(if_limits),
+		.max_interfaces = MT7921_MAX_INTERFACES,
+		.num_different_channels = 1,
+		.beacon_int_infra_match = true,
+	}
+};
+
+static void
+mt7921_init_wiphy(struct ieee80211_hw *hw)
+{
+	struct mt7921_phy *phy = mt7921_hw_phy(hw);
+	struct wiphy *wiphy = hw->wiphy;
+
+	hw->queues = 4;
+	hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
+	hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
+
+	phy->slottime = 9;
+
+	hw->sta_data_size = sizeof(struct mt7921_sta);
+	hw->vif_data_size = sizeof(struct mt7921_vif);
+
+	wiphy->iface_combinations = if_comb;
+	wiphy->n_iface_combinations = ARRAY_SIZE(if_comb);
+	wiphy->max_scan_ie_len = MT7921_SCAN_IE_LEN;
+	wiphy->max_scan_ssids = 4;
+	wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
+
+	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_SET_SCAN_DWELL);
+
+	ieee80211_hw_set(hw, SINGLE_SCAN_ON_ALL_BANDS);
+	ieee80211_hw_set(hw, HAS_RATE_CONTROL);
+	ieee80211_hw_set(hw, SUPPORTS_TX_ENCAP_OFFLOAD);
+	ieee80211_hw_set(hw, WANT_MONITOR_VIF);
+
+	hw->max_tx_fragments = 4;
+}
+
+static void
+mt7921_mac_init_band(struct mt7921_dev *dev, u8 band)
+{
+	u32 mask, set;
+
+	mt76_rmw_field(dev, MT_TMAC_CTCR0(band),
+		       MT_TMAC_CTCR0_INS_DDLMT_REFTIME, 0x3f);
+	mt76_set(dev, MT_TMAC_CTCR0(band),
+		 MT_TMAC_CTCR0_INS_DDLMT_VHT_SMPDU_EN |
+		 MT_TMAC_CTCR0_INS_DDLMT_EN);
+
+	mask = MT_MDP_RCFR0_MCU_RX_MGMT |
+	       MT_MDP_RCFR0_MCU_RX_CTL_NON_BAR |
+	       MT_MDP_RCFR0_MCU_RX_CTL_BAR;
+	set = FIELD_PREP(MT_MDP_RCFR0_MCU_RX_MGMT, MT_MDP_TO_HIF) |
+	      FIELD_PREP(MT_MDP_RCFR0_MCU_RX_CTL_NON_BAR, MT_MDP_TO_HIF) |
+	      FIELD_PREP(MT_MDP_RCFR0_MCU_RX_CTL_BAR, MT_MDP_TO_HIF);
+	mt76_rmw(dev, MT_MDP_BNRCFR0(band), mask, set);
+
+	mask = MT_MDP_RCFR1_MCU_RX_BYPASS |
+	       MT_MDP_RCFR1_RX_DROPPED_UCAST |
+	       MT_MDP_RCFR1_RX_DROPPED_MCAST;
+	set = FIELD_PREP(MT_MDP_RCFR1_MCU_RX_BYPASS, MT_MDP_TO_HIF) |
+	      FIELD_PREP(MT_MDP_RCFR1_RX_DROPPED_UCAST, MT_MDP_TO_HIF) |
+	      FIELD_PREP(MT_MDP_RCFR1_RX_DROPPED_MCAST, MT_MDP_TO_HIF);
+	mt76_rmw(dev, MT_MDP_BNRCFR1(band), mask, set);
+
+	mt76_set(dev, MT_WF_RMAC_MIB_TIME0(band), MT_WF_RMAC_MIB_RXTIME_EN);
+	mt76_set(dev, MT_WF_RMAC_MIB_AIRTIME0(band), MT_WF_RMAC_MIB_RXTIME_EN);
+
+	mt76_rmw_field(dev, MT_DMA_DCR0(band), MT_DMA_DCR0_MAX_RX_LEN, 1536);
+	/* disable rx rate report by default due to hw issues */
+	mt76_clear(dev, MT_DMA_DCR0(band), MT_DMA_DCR0_RXD_G5_EN);
+}
+
+static void mt7921_mac_init(struct mt7921_dev *dev)
+{
+	int i;
+
+	mt76_rmw_field(dev, MT_MDP_DCR1, MT_MDP_DCR1_MAX_RX_LEN, 1536);
+	/* disable hardware de-agg */
+	mt76_clear(dev, MT_MDP_DCR0, MT_MDP_DCR0_DAMSDU_EN);
+	mt76_clear(dev, MT_MDP_DCR0, MT_MDP_DCR0_RX_HDR_TRANS_EN);
+
+	for (i = 0; i < MT7921_WTBL_SIZE; i++)
+		mt7921_mac_wtbl_update(dev, i,
+				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
+	for (i = 0; i < 2; i++)
+		mt7921_mac_init_band(dev, i);
+
+	mt7921_mcu_set_rts_thresh(&dev->phy, 0x92b);
+}
+
+static void mt7921_init_work(struct work_struct *work)
+{
+	struct mt7921_dev *dev = container_of(work, struct mt7921_dev,
+				 init_work);
+
+	mt7921_mcu_set_eeprom(dev);
+	mt7921_mac_init(dev);
+}
+
+static int mt7921_init_hardware(struct mt7921_dev *dev)
+{
+	int ret, idx;
+
+	INIT_WORK(&dev->init_work, mt7921_init_work);
+	spin_lock_init(&dev->token_lock);
+	idr_init(&dev->token);
+
+	ret = mt7921_dma_init(dev);
+	if (ret)
+		return ret;
+
+	set_bit(MT76_STATE_INITIALIZED, &dev->mphy.state);
+
+	/* force firmware operation mode into normal state,
+	 * which should be set before firmware download stage.
+	 */
+	mt76_wr(dev, MT_SWDEF_MODE, MT_SWDEF_NORMAL_MODE);
+
+	ret = mt7921_mcu_init(dev);
+	if (ret)
+		return ret;
+
+	ret = mt7921_eeprom_init(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Beacon and mgmt frames should occupy wcid 0 */
+	idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT7921_WTBL_STA - 1);
+	if (idx)
+		return -ENOSPC;
+
+	dev->mt76.global_wcid.idx = idx;
+	dev->mt76.global_wcid.hw_key_idx = -1;
+	dev->mt76.global_wcid.tx_info |= MT_WCID_TX_INFO_SET;
+	rcu_assign_pointer(dev->mt76.wcid[idx], &dev->mt76.global_wcid);
+
+	return 0;
+}
+
+int mt7921_register_device(struct mt7921_dev *dev)
+{
+	struct ieee80211_hw *hw = mt76_hw(dev);
+	int ret;
+
+	dev->phy.dev = dev;
+	dev->phy.mt76 = &dev->mt76.phy;
+	dev->mt76.phy.priv = &dev->phy;
+	INIT_LIST_HEAD(&dev->phy.stats_list);
+	INIT_DELAYED_WORK(&dev->mphy.mac_work, mt7921_mac_work);
+	INIT_DELAYED_WORK(&dev->phy.scan_work, mt7921_scan_work);
+	skb_queue_head_init(&dev->phy.scan_event_list);
+	INIT_LIST_HEAD(&dev->sta_poll_list);
+	spin_lock_init(&dev->sta_poll_lock);
+
+	init_waitqueue_head(&dev->reset_wait);
+	INIT_WORK(&dev->reset_work, mt7921_mac_reset_work);
+
+	ret = mt7921_init_hardware(dev);
+	if (ret)
+		return ret;
+
+	mt7921_init_wiphy(hw);
+	dev->mphy.sband_2g.sband.ht_cap.cap |=
+			IEEE80211_HT_CAP_LDPC_CODING |
+			IEEE80211_HT_CAP_MAX_AMSDU;
+	dev->mphy.sband_5g.sband.ht_cap.cap |=
+			IEEE80211_HT_CAP_LDPC_CODING |
+			IEEE80211_HT_CAP_MAX_AMSDU;
+	dev->mphy.sband_5g.sband.vht_cap.cap |=
+			IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
+			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
+	dev->mphy.sband_5g.sband.vht_cap.cap |=
+			IEEE80211_VHT_CAP_SHORT_GI_160 |
+			IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
+	dev->mphy.hw->wiphy->available_antennas_rx = dev->mphy.chainmask;
+	dev->mphy.hw->wiphy->available_antennas_tx = dev->mphy.chainmask;
+
+	mt76_set_stream_caps(&dev->mphy, true);
+	mt7921_set_stream_he_caps(&dev->phy);
+
+	ret = mt76_register_device(&dev->mt76, true, mt7921_rates,
+				   ARRAY_SIZE(mt7921_rates));
+	if (ret)
+		return ret;
+
+	ieee80211_queue_work(mt76_hw(dev), &dev->init_work);
+
+	return 0;
+}
+
+void mt7921_unregister_device(struct mt7921_dev *dev)
+{
+	mt76_unregister_device(&dev->mt76);
+	mt7921_mcu_exit(dev);
+	mt7921_dma_cleanup(dev);
+
+	mt7921_tx_token_put(dev);
+
+	tasklet_disable(&dev->irq_tasklet);
+	mt76_free_device(&dev->mt76);
+}