wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices

The driver first supports Filogic 680 PCI device, which is a Wi-Fi 7
chipset supporting concurrent tri-band operation at 6 GHz, 5 GHz, and
2.4 GHz with 4x4 antennas on each band.

Currently, mt7996 only supports tri-band HE or older mode.
EHT mode and more variants of Filogic 680 support will be introduced
in further patches.

Reviewed-by: Ryder Lee <ryder.lee@mediatek.com>
Co-developed-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Co-developed-by: Bo Jiao <Bo.Jiao@mediatek.com>
Signed-off-by: Bo Jiao <Bo.Jiao@mediatek.com>
Co-developed-by: Howard Hsu <howard-yh.hsu@mediatek.com>
Signed-off-by: Howard Hsu <howard-yh.hsu@mediatek.com>
Co-developed-by: MeiChia Chiu <meichia.chiu@mediatek.com>
Signed-off-by: MeiChia Chiu <meichia.chiu@mediatek.com>
Co-developed-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Co-developed-by: Money Wang <Money.Wang@mediatek.com>
Signed-off-by: Money Wang <Money.Wang@mediatek.com>
Co-developed-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
Signed-off-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/Kconfig

@@ -34,3 +34,4 @@ 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"
+source "drivers/net/wireless/mediatek/mt76/mt7996/Kconfig"

drivers/net/wireless/mediatek/mt76/Makefile

@@ -35,3 +35,4 @@ obj-$(CONFIG_MT7603E) += mt7603/
 obj-$(CONFIG_MT7615_COMMON) += mt7615/
 obj-$(CONFIG_MT7915E) += mt7915/
 obj-$(CONFIG_MT7921_COMMON) += mt7921/
+obj-$(CONFIG_MT7996E) += mt7996/

drivers/net/wireless/mediatek/mt76/mt7996/Kconfig

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: ISC
+config MT7996E
+	tristate "MediaTek MT7996 (PCIe) support"
+	select MT76_CONNAC_LIB
+	depends on MAC80211
+	depends on PCI
+	help
+	  This adds support for MT7996-based wireless PCIe devices,
+	  which support concurrent tri-band operation at 6GHz, 5GHz,
+	  and 2.4GHz IEEE 802.11be 4x4:4SS 4096-QAM, 320MHz channels.
+
+	  To compile this driver as a module, choose M here.

drivers/net/wireless/mediatek/mt76/mt7996/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: ISC
+
+obj-$(CONFIG_MT7996E) += mt7996e.o
+
+mt7996e-y := pci.o init.o dma.o eeprom.o main.o mcu.o mac.o \
+	     debugfs.o mmio.o