wifi: mt76: mt7996: add variants support

There are variants of mt7996 which are different from eht supported and
wtbl size limit. Get the hw caps with CHIP_CONFIG command.

Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c

@@ -87,6 +87,28 @@ static int mt7996_eeprom_load(struct mt7996_dev *dev)
 	return mt7996_check_eeprom(dev);
 }
 
+static int mt7996_eeprom_parse_efuse_hw_cap(struct mt7996_dev *dev)
+{
+#define MODE_HE_ONLY		BIT(0)
+#define WTBL_SIZE_GROUP		GENMASK(31, 28)
+	u32 cap = 0;
+	int ret;
+
+	ret = mt7996_mcu_get_chip_config(dev, &cap);
+	if (ret)
+		return ret;
+
+	if (cap) {
+		dev->has_eht = !(cap & MODE_HE_ONLY);
+		dev->wtbl_size_group = u32_get_bits(cap, WTBL_SIZE_GROUP);
+	}
+
+	if (dev->wtbl_size_group < 2 || dev->wtbl_size_group > 4)
+		dev->wtbl_size_group = 2; /* set default */
+
+	return 0;
+}
+
 static int mt7996_eeprom_parse_band_config(struct mt7996_phy *phy)
 {
 	u8 *eeprom = phy->dev->mt76.eeprom.data;
@@ -133,6 +155,7 @@ int mt7996_eeprom_parse_hw_cap(struct mt7996_dev *dev, struct mt7996_phy *phy)
 	u8 path, nss, band_idx = phy->mt76->band_idx;
 	u8 *eeprom = dev->mt76.eeprom.data;
 	struct mt76_phy *mphy = phy->mt76;
+	int ret;
 
 	switch (band_idx) {
 	case MT_BAND1:
@@ -167,6 +190,10 @@ int mt7996_eeprom_parse_hw_cap(struct mt7996_dev *dev, struct mt7996_phy *phy)
 		dev->chainshift[band_idx + 1] = dev->chainshift[band_idx] +
 						hweight16(mphy->chainmask);
 
+	ret = mt7996_eeprom_parse_efuse_hw_cap(dev);
+	if (ret)
+		return ret;
+
 	return mt7996_eeprom_parse_band_config(phy);
 }
 

drivers/net/wireless/mediatek/mt76/mt7996/mcu.c

@@ -2977,6 +2977,52 @@ int mt7996_mcu_get_eeprom_free_block(struct mt7996_dev *dev, u8 *block_num)
 	return 0;
 }
 
+int mt7996_mcu_get_chip_config(struct mt7996_dev *dev, u32 *cap)
+{
+#define NIC_CAP	3
+#define UNI_EVENT_CHIP_CONFIG_EFUSE_VERSION	0x21
+	struct {
+		u8 _rsv[4];
+
+		__le16 tag;
+		__le16 len;
+	} __packed req = {
+		.tag = cpu_to_le16(NIC_CAP),
+		.len = cpu_to_le16(sizeof(req) - 4),
+	};
+	struct sk_buff *skb;
+	u8 *buf;
+	int ret;
+
+	ret = mt76_mcu_send_and_get_msg(&dev->mt76,
+					MCU_WM_UNI_CMD_QUERY(CHIP_CONFIG), &req,
+					sizeof(req), true, &skb);
+	if (ret)
+		return ret;
+
+	/* fixed field */
+	skb_pull(skb, 4);
+
+	buf = skb->data;
+	while (buf - skb->data < skb->len) {
+		struct tlv *tlv = (struct tlv *)buf;
+
+		switch (le16_to_cpu(tlv->tag)) {
+		case UNI_EVENT_CHIP_CONFIG_EFUSE_VERSION:
+			*cap = le32_to_cpu(*(__le32 *)(buf + sizeof(*tlv)));
+			break;
+		default:
+			break;
+		};
+
+		buf += le16_to_cpu(tlv->len);
+	}
+
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
 int mt7996_mcu_get_chan_mib_info(struct mt7996_phy *phy, bool chan_switch)
 {
 	struct {

drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h

@@ -264,6 +264,7 @@ struct mt7996_dev {
 	bool dbdc_support:1;
 	bool tbtc_support:1;
 	bool flash_mode:1;
+	bool has_eht:1;
 
 	bool ibf;
 	u8 fw_debug_wm;
@@ -281,6 +282,8 @@ struct mt7996_dev {
 
 	u32 reg_l1_backup;
 	u32 reg_l2_backup;
+
+	u8 wtbl_size_group;
 };
 
 enum {
@@ -419,6 +422,7 @@ int mt7996_mcu_set_fixed_rate_ctrl(struct mt7996_dev *dev,
 int mt7996_mcu_set_eeprom(struct mt7996_dev *dev);
 int mt7996_mcu_get_eeprom(struct mt7996_dev *dev, u32 offset);
 int mt7996_mcu_get_eeprom_free_block(struct mt7996_dev *dev, u8 *block_num);
+int mt7996_mcu_get_chip_config(struct mt7996_dev *dev, u32 *cap);
 int mt7996_mcu_set_ser(struct mt7996_dev *dev, u8 action, u8 set, u8 band);
 int mt7996_mcu_set_txbf(struct mt7996_dev *dev, u8 action);
 int mt7996_mcu_set_fcc5_lpn(struct mt7996_dev *dev, int val);