wifi: rtw88: rtw8822c: Implement RTL8822CS (SDIO) efuse parsing

The efuse of the SDIO RTL8822CS chip has only one known member: the mac
address is at offset 0x16a. Add a struct rtw8822cs_efuse describing this
and use it for copying the mac address when the SDIO bus is used.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230218152944.48842-6-martin.blumenstingl@googlemail.com

drivers/net/wireless/realtek/rtw88/rtw8822c.c

@@ -35,6 +35,12 @@ static void rtw8822cu_efuse_parsing(struct rtw_efuse *efuse,
 	ether_addr_copy(efuse->addr, map->u.mac_addr);
 }
 
+static void rtw8822cs_efuse_parsing(struct rtw_efuse *efuse,
+				    struct rtw8822c_efuse *map)
+{
+	ether_addr_copy(efuse->addr, map->s.mac_addr);
+}
+
 static int rtw8822c_read_efuse(struct rtw_dev *rtwdev, u8 *log_map)
 {
 	struct rtw_efuse *efuse = &rtwdev->efuse;
@@ -67,6 +73,9 @@ static int rtw8822c_read_efuse(struct rtw_dev *rtwdev, u8 *log_map)
 	case RTW_HCI_TYPE_USB:
 		rtw8822cu_efuse_parsing(efuse, map);
 		break;
+	case RTW_HCI_TYPE_SDIO:
+		rtw8822cs_efuse_parsing(efuse, map);
+		break;
 	default:
 		/* unsupported now */
 		return -ENOTSUPP;

drivers/net/wireless/realtek/rtw88/rtw8822c.h

@@ -16,6 +16,11 @@ struct rtw8822cu_efuse {
 	u8 res2[0x3d];
 };
 
+struct rtw8822cs_efuse {
+	u8 res0[0x4a];			/* 0x120 */
+	u8 mac_addr[ETH_ALEN];		/* 0x16a */
+} __packed;
+
 struct rtw8822ce_efuse {
 	u8 mac_addr[ETH_ALEN];		/* 0x120 */
 	u8 vender_id[2];
@@ -91,8 +96,9 @@ struct rtw8822c_efuse {
 	u8 res9;
 	u8 res10[0x42];
 	union {
-		struct rtw8822cu_efuse u;
 		struct rtw8822ce_efuse e;
+		struct rtw8822cu_efuse u;
+		struct rtw8822cs_efuse s;
 	};
 };