wifi: rtw88: Add common USB chip support

Add the common bits and pieces to add USB support to the RTW88 driver.
This is based on https://github.com/ulli-kroll/rtw88-usb.git which
itself is first written by Neo Jou.
Signed-off-by: neo_jou <neo_jou@realtek.com>
Signed-off-by: Hans Ulli Kroll <linux@ulli-kroll.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221202081224.2779981-8-s.hauer@pengutronix.de

drivers/net/wireless/realtek/rtw88/Kconfig

@@ -16,6 +16,9 @@ config RTW88_CORE
 config RTW88_PCI
 	tristate
 
+config RTW88_USB
+	tristate
+
 config RTW88_8822B
 	tristate
 

drivers/net/wireless/realtek/rtw88/Makefile

@@ -46,3 +46,6 @@ rtw88_8821ce-objs		:= rtw8821ce.o
 
 obj-$(CONFIG_RTW88_PCI)		+= rtw88_pci.o
 rtw88_pci-objs			:= pci.o
+
+obj-$(CONFIG_RTW88_USB)		+= rtw88_usb.o
+rtw88_usb-objs			:= usb.o

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

@@ -1048,6 +1048,9 @@ static int txdma_queue_mapping(struct rtw_dev *rtwdev)
 	if (rtw_chip_wcpu_11ac(rtwdev))
 		rtw_write32(rtwdev, REG_H2CQ_CSR, BIT_H2CQ_FULL);
 
+	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_USB)
+		rtw_write8_set(rtwdev, REG_TXDMA_PQ_MAP, BIT_RXDMA_ARBBW_EN);
+
 	return 0;
 }
 

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

@@ -1783,6 +1783,10 @@ static int rtw_chip_parameter_setup(struct rtw_dev *rtwdev)
 		rtwdev->hci.rpwm_addr = 0x03d9;
 		rtwdev->hci.cpwm_addr = 0x03da;
 		break;
+	case RTW_HCI_TYPE_USB:
+		rtwdev->hci.rpwm_addr = 0xfe58;
+		rtwdev->hci.cpwm_addr = 0xfe57;
+		break;
 	default:
 		rtw_err(rtwdev, "unsupported hci type\n");
 		return -EINVAL;

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

@@ -871,6 +871,10 @@ struct rtw_chip_ops {
 			       bool is_tx2_path);
 	void (*config_txrx_mode)(struct rtw_dev *rtwdev, u8 tx_path,
 				 u8 rx_path, bool is_tx2_path);
+	/* for USB/SDIO only */
+	void (*fill_txdesc_checksum)(struct rtw_dev *rtwdev,
+				     struct rtw_tx_pkt_info *pkt_info,
+				     u8 *txdesc);
 
 	/* for coex */
 	void (*coex_set_init)(struct rtw_dev *rtwdev);

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

@@ -184,6 +184,7 @@
 #define BIT_TXDMA_VIQ_MAP(x)                                                   \
 	(((x) & BIT_MASK_TXDMA_VIQ_MAP) << BIT_SHIFT_TXDMA_VIQ_MAP)
 #define REG_TXDMA_PQ_MAP	0x010C
+#define BIT_RXDMA_ARBBW_EN	BIT(0)
 #define BIT_SHIFT_TXDMA_BEQ_MAP	8
 #define BIT_MASK_TXDMA_BEQ_MAP	0x3
 #define BIT_TXDMA_BEQ_MAP(x)                                                   \

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

@@ -71,6 +71,14 @@
 	le32p_replace_bits((__le32 *)(txdesc) + 0x03, value, BIT(15))
 #define SET_TX_DESC_BT_NULL(txdesc, value)				       \
 	le32p_replace_bits((__le32 *)(txdesc) + 0x02, value, BIT(23))
+#define SET_TX_DESC_TXDESC_CHECKSUM(txdesc, value)				\
+	le32p_replace_bits((__le32 *)(txdesc) + 0x07, value, GENMASK(15, 0))
+#define SET_TX_DESC_DMA_TXAGG_NUM(txdesc, value)				\
+	le32p_replace_bits((__le32 *)(txdesc) + 0x07, value, GENMASK(31, 24))
+#define GET_TX_DESC_PKT_OFFSET(txdesc)						\
+	le32_get_bits(*((__le32 *)(txdesc) + 0x01), GENMASK(28, 24))
+#define GET_TX_DESC_QSEL(txdesc)						\
+	le32_get_bits(*((__le32 *)(txdesc) + 0x01), GENMASK(12, 8))
 
 enum rtw_tx_desc_queue_select {
 	TX_DESC_QSEL_TID0	= 0,
@@ -123,4 +131,27 @@ rtw_tx_write_data_h2c_get(struct rtw_dev *rtwdev,
 			  struct rtw_tx_pkt_info *pkt_info,
 			  u8 *buf, u32 size);
 
+static inline
+void fill_txdesc_checksum_common(u8 *txdesc, size_t words)
+{
+	__le16 chksum = 0;
+	__le16 *data = (__le16 *)(txdesc);
+
+	SET_TX_DESC_TXDESC_CHECKSUM(txdesc, 0x0000);
+
+	while (words--)
+		chksum ^= *data++;
+
+	SET_TX_DESC_TXDESC_CHECKSUM(txdesc, __le16_to_cpu(chksum));
+}
+
+static inline void rtw_tx_fill_txdesc_checksum(struct rtw_dev *rtwdev,
+					       struct rtw_tx_pkt_info *pkt_info,
+					       u8 *txdesc)
+{
+	const struct rtw_chip_info *chip = rtwdev->chip;
+
+	chip->ops->fill_txdesc_checksum(rtwdev, pkt_info, txdesc);
+}
+
 #endif

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

+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/* Copyright(c) 2018-2019  Realtek Corporation
+ */
+
+#ifndef __RTW_USB_H_
+#define __RTW_USB_H_
+
+#define FW_8192C_START_ADDRESS		0x1000
+#define FW_8192C_END_ADDRESS		0x5fff
+
+#define RTW_USB_MAX_RXTX_COUNT		128
+#define RTW_USB_VENQT_MAX_BUF_SIZE	254
+#define MAX_USBCTRL_VENDORREQ_TIMES	10
+
+#define RTW_USB_CMD_READ		0xc0
+#define RTW_USB_CMD_WRITE		0x40
+#define RTW_USB_CMD_REQ			0x05
+
+#define RTW_USB_VENQT_CMD_IDX		0x00
+
+#define RTW_USB_SUPER_SPEED_BULK_SIZE	1024
+#define RTW_USB_HIGH_SPEED_BULK_SIZE	512
+#define RTW_USB_FULL_SPEED_BULK_SIZE	64
+
+#define RTW_USB_TX_SEL_HQ		BIT(0)
+#define RTW_USB_TX_SEL_LQ		BIT(1)
+#define RTW_USB_TX_SEL_NQ		BIT(2)
+#define RTW_USB_TX_SEL_EQ		BIT(3)
+
+#define RTW_USB_BULK_IN_ADDR		0x80
+#define RTW_USB_INT_IN_ADDR		0x81
+
+#define RTW_USB_HW_QUEUE_ENTRY		8
+
+#define RTW_USB_PACKET_OFFSET_SZ	8
+#define RTW_USB_MAX_XMITBUF_SZ		(1024 * 20)
+#define RTW_USB_MAX_RECVBUF_SZ		32768
+
+#define RTW_USB_RECVBUFF_ALIGN_SZ	8
+
+#define RTW_USB_RXAGG_SIZE		6
+#define RTW_USB_RXAGG_TIMEOUT		10
+
+#define RTW_USB_RXCB_NUM		4
+
+#define RTW_USB_EP_MAX			4
+
+#define TX_DESC_QSEL_MAX		20
+
+#define RTW_USB_VENDOR_ID_REALTEK	0x0bda
+
+static inline struct rtw_usb *rtw_get_usb_priv(struct rtw_dev *rtwdev)
+{
+	return (struct rtw_usb *)rtwdev->priv;
+}
+
+struct rx_usb_ctrl_block {
+	struct rtw_dev *rtwdev;
+	struct urb *rx_urb;
+	struct sk_buff *rx_skb;
+	int n;
+};
+
+struct rtw_usb_tx_data {
+	u8 sn;
+};
+
+struct rtw_usb {
+	struct rtw_dev *rtwdev;
+	struct usb_device *udev;
+
+	/* protects usb_data_index */
+	spinlock_t usb_lock;
+	__le32 *usb_data;
+	unsigned int usb_data_index;
+
+	u32 bulkout_size;
+	u8 pipe_interrupt;
+	u8 pipe_in;
+	u8 out_ep[RTW_USB_EP_MAX];
+	u8 qsel_to_ep[TX_DESC_QSEL_MAX];
+	u8 usb_txagg_num;
+
+	struct workqueue_struct *txwq, *rxwq;
+
+	struct sk_buff_head tx_queue[RTW_USB_EP_MAX];
+	struct work_struct tx_work;
+
+	struct rx_usb_ctrl_block rx_cb[RTW_USB_RXCB_NUM];
+	struct sk_buff_head rx_queue;
+	struct work_struct rx_work;
+};
+
+static inline struct rtw_usb_tx_data *rtw_usb_get_tx_data(struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+	BUILD_BUG_ON(sizeof(struct rtw_usb_tx_data) >
+		     sizeof(info->status.status_driver_data));
+
+	return (struct rtw_usb_tx_data *)info->status.status_driver_data;
+}
+
+int rtw_usb_probe(struct usb_interface *intf, const struct usb_device_id *id);
+void rtw_usb_disconnect(struct usb_interface *intf);
+
+#endif