wifi: rtw88: Add rtw8821cu chipset support

Add support for the rtw8821cu chipset based on
https://github.com/ulli-kroll/rtw88-usb.gitSigned-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221202081224.2779981-9-s.hauer@pengutronix.de

drivers/net/wireless/realtek/rtw88/Kconfig

@@ -75,6 +75,17 @@ config RTW88_8821CE
 
 	  802.11ac PCIe wireless network adapter
 
+config RTW88_8821CU
+	tristate "Realtek 8821CU USB wireless network adapter"
+	depends on USB
+	select RTW88_CORE
+	select RTW88_USB
+	select RTW88_8821C
+	help
+	  Select this option will enable support for 8821CU chipset
+
+	  802.11ac USB wireless network adapter
+
 config RTW88_DEBUG
 	bool "Realtek rtw88 debug support"
 	depends on RTW88_CORE

drivers/net/wireless/realtek/rtw88/Makefile

@@ -44,6 +44,9 @@ rtw88_8821c-objs		:= rtw8821c.o rtw8821c_table.o
 obj-$(CONFIG_RTW88_8821CE)	+= rtw88_8821ce.o
 rtw88_8821ce-objs		:= rtw8821ce.o
 
+obj-$(CONFIG_RTW88_8821CU)	+= rtw88_8821cu.o
+rtw88_8821cu-objs		:= rtw8821cu.o
+
 obj-$(CONFIG_RTW88_PCI)		+= rtw88_pci.o
 rtw88_pci-objs			:= pci.o
 

drivers/net/wireless/realtek/rtw88/rtw8821c.c

@@ -26,6 +26,12 @@ static void rtw8821ce_efuse_parsing(struct rtw_efuse *efuse,
 	ether_addr_copy(efuse->addr, map->e.mac_addr);
 }
 
+static void rtw8821cu_efuse_parsing(struct rtw_efuse *efuse,
+				    struct rtw8821c_efuse *map)
+{
+	ether_addr_copy(efuse->addr, map->u.mac_addr);
+}
+
 enum rtw8821ce_rf_set {
 	SWITCH_TO_BTG,
 	SWITCH_TO_WLG,
@@ -68,6 +74,9 @@ static int rtw8821c_read_efuse(struct rtw_dev *rtwdev, u8 *log_map)
 	case RTW_HCI_TYPE_PCIE:
 		rtw8821ce_efuse_parsing(efuse, map);
 		break;
+	case RTW_HCI_TYPE_USB:
+		rtw8821cu_efuse_parsing(efuse, map);
+		break;
 	default:
 		/* unsupported now */
 		return -ENOTSUPP;
@@ -1148,6 +1157,13 @@ static void rtw8821c_phy_cck_pd_set(struct rtw_dev *rtwdev, u8 new_lvl)
 			 dm_info->cck_pd_default + new_lvl * 2);
 }
 
+static void rtw8821c_fill_txdesc_checksum(struct rtw_dev *rtwdev,
+					  struct rtw_tx_pkt_info *pkt_info,
+					  u8 *txdesc)
+{
+	fill_txdesc_checksum_common(txdesc, 16);
+}
+
 static struct rtw_pwr_seq_cmd trans_carddis_to_cardemu_8821c[] = {
 	{0x0086,
 	 RTW_PWR_CUT_ALL_MSK,
@@ -1521,6 +1537,7 @@ static const struct rtw_rfe_def rtw8821c_rfe_defs[] = {
 	[2] = RTW_DEF_RFE_EXT(8821c, 0, 0, 2),
 	[4] = RTW_DEF_RFE_EXT(8821c, 0, 0, 2),
 	[6] = RTW_DEF_RFE(8821c, 0, 0),
+	[34] = RTW_DEF_RFE(8821c, 0, 0),
 };
 
 static struct rtw_hw_reg rtw8821c_dig[] = {
@@ -1595,6 +1612,7 @@ static struct rtw_chip_ops rtw8821c_ops = {
 	.config_bfee		= rtw8821c_bf_config_bfee,
 	.set_gid_table		= rtw_bf_set_gid_table,
 	.cfg_csi_rate		= rtw_bf_cfg_csi_rate,
+	.fill_txdesc_checksum	= rtw8821c_fill_txdesc_checksum,
 
 	.coex_set_init		= rtw8821c_coex_cfg_init,
 	.coex_set_ant_switch	= rtw8821c_coex_cfg_ant_switch,

drivers/net/wireless/realtek/rtw88/rtw8821c.h

@@ -9,6 +9,26 @@
 
 #define RCR_VHT_ACK		BIT(26)
 
+struct rtw8821cu_efuse {
+	u8 res4[4];			/* 0xd0 */
+	u8 usb_optional_function;
+	u8 res5[0x1e];
+	u8 res6[2];
+	u8 serial[0x0b];		/* 0xf5 */
+	u8 vid;				/* 0x100 */
+	u8 res7;
+	u8 pid;
+	u8 res8[4];
+	u8 mac_addr[ETH_ALEN];		/* 0x107 */
+	u8 res9[2];
+	u8 vendor_name[0x07];
+	u8 res10[2];
+	u8 device_name[0x14];
+	u8 res11[0xcf];
+	u8 package_type;		/* 0x1fb */
+	u8 res12[0x4];
+};
+
 struct rtw8821ce_efuse {
 	u8 mac_addr[ETH_ALEN];		/* 0xd0 */
 	u8 vender_id[2];
@@ -73,6 +93,7 @@ struct rtw8821c_efuse {
 	u8 res[3];
 	union {
 		struct rtw8821ce_efuse e;
+		struct rtw8821cu_efuse u;
 	};
 };
 

drivers/net/wireless/realtek/rtw88/rtw8821cu.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright(c) 2018-2019  Realtek Corporation
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include "main.h"
+#include "rtw8821c.h"
+#include "usb.h"
+
+static const struct usb_device_id rtw_8821cu_id_table[] = {
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xb82b, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8821CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xb820, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8821CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xc821, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8821CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xc820, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8821CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xc82a, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8821CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xc82b, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8821CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0xc811, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8811CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0x8811, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* 8811CU */
+	{ USB_DEVICE_AND_INTERFACE_INFO(RTW_USB_VENDOR_ID_REALTEK, 0x2006, 0xff, 0xff, 0xff),
+	  .driver_info = (kernel_ulong_t)&(rtw8821c_hw_spec) }, /* TOTOLINK A650UA v3 */
+	{},
+};
+MODULE_DEVICE_TABLE(usb, rtw_8821cu_id_table);
+
+static int rtw_8821cu_probe(struct usb_interface *intf,
+			    const struct usb_device_id *id)
+{
+	return rtw_usb_probe(intf, id);
+}
+
+static struct usb_driver rtw_8821cu_driver = {
+	.name = "rtw_8821cu",
+	.id_table = rtw_8821cu_id_table,
+	.probe = rtw_8821cu_probe,
+	.disconnect = rtw_usb_disconnect,
+};
+module_usb_driver(rtw_8821cu_driver);
+
+MODULE_AUTHOR("Hans Ulli Kroll <linux@ulli-kroll.de>");
+MODULE_DESCRIPTION("Realtek 802.11ac wireless 8821cu driver");
+MODULE_LICENSE("Dual BSD/GPL");