[PATCH v5 07/11] wifi: rtw88: Add common USB chip support

Sascha Hauer
2022-12-02T08:13:30Z

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>
---

Notes:
Changes since v4:
- Drop endless loop check again

Changes since v3:
- Add sanity break out of potentially endless loop
- Do not interleave PCI and USB support in Makefile
- fix rtwusb->usb_data_index locking
- make data_ptr variable in rtw_usb_tx_agg_skb() unnecessary
- Some coding style fixup
- drop set-but-unused variable in rtw_usb_write_data()
- Increase RTW_USB_MAX_RXQ_LEN to 512. I've seen "failed to get rx_queue, overflow\n"
trigger otherwise

Changes since v2:
- Fix buffer length for aggregated tx packets
- Increase maximum transmit buffer size to 20KiB as found in downstream drivers
- Change register write functions to synchronous accesses instead of just firing
a URB without waiting for its completion
- requeue rx URBs directly in completion handler rather than having a workqueue
for it.

Changes since v1:
- Make checkpatch.pl clean
- Drop WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL flag
- Use 'ret' as variable name for return values
- Sort variable declarations in reverse Xmas tree order
- Change potentially endless loop to a limited loop
- Change locking to be more obviously correct
- drop unnecessary check for !rtwdev
- make sure the refill workqueue is not restarted again after we have
cancelled it

drivers/net/wireless/realtek/rtw88/Kconfig | 3 +
drivers/net/wireless/realtek/rtw88/Makefile | 3 +
drivers/net/wireless/realtek/rtw88/mac.c | 3 +
drivers/net/wireless/realtek/rtw88/main.c | 4 +
drivers/net/wireless/realtek/rtw88/main.h | 4 +
drivers/net/wireless/realtek/rtw88/reg.h | 1 +
drivers/net/wireless/realtek/rtw88/tx.h | 31 +
drivers/net/wireless/realtek/rtw88/usb.c | 911 ++++++++++++++++++++
drivers/net/wireless/realtek/rtw88/usb.h | 107 +++
9 files changed, 1067 insertions(+)
create mode 100644 drivers/net/wireless/realtek/rtw88/usb.c
create mode 100644 drivers/net/wireless/realtek/rtw88/usb.h

diff --git a/drivers/net/wireless/realtek/rtw88/Kconfig b/drivers/net/wireless/realtek/rtw88/Kconfig
index e3d7cb6c12902..1624c5db69bac 100644
--- a/drivers/net/wireless/realtek/rtw88/Kconfig
+++ b/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

diff --git a/drivers/net/wireless/realtek/rtw88/Makefile b/drivers/net/wireless/realtek/rtw88/Makefile
index 834c66ec0af9e..2c2b0e5133cdf 100644
--- a/drivers/net/wireless/realtek/rtw88/Makefile
+++ b/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
diff --git a/drivers/net/wireless/realtek/rtw88/mac.c b/drivers/net/wireless/realtek/rtw88/mac.c
index 52076e89d59a3..5882fc0fb885b 100644
--- a/drivers/net/wireless/realtek/rtw88/mac.c
+++ b/drivers/net/wireless/realtek/rtw88/mac.c
@@ -1032,6 +1032,9 @@ 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;
}

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 0a2ce7f50f412..888427cf3bdf9 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/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;
diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h
index 77fd48b6cc453..165f299e8e1f9 100644
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/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);
diff --git a/drivers/net/wireless/realtek/rtw88/reg.h b/drivers/net/wireless/realtek/rtw88/reg.h
index 03bd8dc53f72a..8852b24d6c2ac 100644
--- a/drivers/net/wireless/realtek/rtw88/reg.h
+++ b/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) \
diff --git a/drivers/net/wireless/realtek/rtw88/tx.h b/drivers/net/wireless/realtek/rtw88/tx.h
index 8419603adce4a..a2f3ac326041b 100644
--- a/drivers/net/wireless/realtek/rtw88/tx.h
+++ b/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
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
new file mode 100644
index 0000000000000..4ef38279b64c9
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -0,0 +1,911 @@
+// 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 <linux/mutex.h>
+#include "main.h"
+#include "debug.h"
+#include "reg.h"
+#include "tx.h"
+#include "rx.h"
+#include "fw.h"
+#include "ps.h"
+#include "usb.h"
+
+#define RTW_USB_MAX_RXQ_LEN 512
+
+struct rtw_usb_txcb {
+ struct rtw_dev *rtwdev;
+ struct sk_buff_head tx_ack_queue;
+};
+
+static void rtw_usb_fill_tx_checksum(struct rtw_usb *rtwusb,
+ struct sk_buff *skb, int agg_num)
+{
+ struct rtw_dev *rtwdev = rtwusb->rtwdev;
+ struct rtw_tx_pkt_info pkt_info;
+
+ SET_TX_DESC_DMA_TXAGG_NUM(skb->data, agg_num);
+ pkt_info.pkt_offset = GET_TX_DESC_PKT_OFFSET(skb->data);
+ rtw_tx_fill_txdesc_checksum(rtwdev, &pkt_info, skb->data);
+}
+
+static u32 rtw_usb_read(struct rtw_dev *rtwdev, u32 addr, u16 len)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ struct usb_device *udev = rtwusb->udev;
+ __le32 *data;
+ unsigned long flags;
+ int idx, ret;
+ static int count;
+
+ spin_lock_irqsave(&rtwusb->usb_lock, flags);
+
+ idx = rtwusb->usb_data_index;
+ rtwusb->usb_data_index = (idx + 1) & (RTW_USB_MAX_RXTX_COUNT - 1);
+
+ spin_unlock_irqrestore(&rtwusb->usb_lock, flags);
+
+ data = &rtwusb->usb_data[idx];
+
+ ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
+ RTW_USB_CMD_REQ, RTW_USB_CMD_READ, addr,
+ RTW_USB_VENQT_CMD_IDX, data, len, 1000);
+ if (ret < 0 && ret != -ENODEV && count++ < 4)
+ rtw_err(rtwdev, "read register 0x%x failed with %d\n",
+ addr, ret);
+
+ return le32_to_cpu(*data);
+}
+
+static u8 rtw_usb_read8(struct rtw_dev *rtwdev, u32 addr)
+{
+ return (u8)rtw_usb_read(rtwdev, addr, 1);
+}
+
+static u16 rtw_usb_read16(struct rtw_dev *rtwdev, u32 addr)
+{
+ return (u16)rtw_usb_read(rtwdev, addr, 2);
+}
+
+static u32 rtw_usb_read32(struct rtw_dev *rtwdev, u32 addr)
+{
+ return (u32)rtw_usb_read(rtwdev, addr, 4);
+}
+
+static void rtw_usb_write(struct rtw_dev *rtwdev, u32 addr, u32 val, int len)
+{
+ struct rtw_usb *rtwusb = (struct rtw_usb *)rtwdev->priv;
+ struct usb_device *udev = rtwusb->udev;
+ unsigned long flags;
+ __le32 *data;
+ int idx, ret;
+ static int count;
+
+ spin_lock_irqsave(&rtwusb->usb_lock, flags);
+
+ idx = rtwusb->usb_data_index;
+ rtwusb->usb_data_index = (idx + 1) & (RTW_USB_MAX_RXTX_COUNT - 1);
+
+ spin_unlock_irqrestore(&rtwusb->usb_lock, flags);
+
+ data = &rtwusb->usb_data[idx];
+
+ *data = cpu_to_le32(val);
+
+ ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ RTW_USB_CMD_REQ, RTW_USB_CMD_WRITE,
+ addr, 0, data, len, 30000);
+ if (ret < 0 && ret != -ENODEV && count++ < 4)
+ rtw_err(rtwdev, "write register 0x%x failed with %d\n",
+ addr, ret);
+}
+
+static void rtw_usb_write8(struct rtw_dev *rtwdev, u32 addr, u8 val)
+{
+ rtw_usb_write(rtwdev, addr, val, 1);
+}
+
+static void rtw_usb_write16(struct rtw_dev *rtwdev, u32 addr, u16 val)
+{
+ rtw_usb_write(rtwdev, addr, val, 2);
+}
+
+static void rtw_usb_write32(struct rtw_dev *rtwdev, u32 addr, u32 val)
+{
+ rtw_usb_write(rtwdev, addr, val, 4);
+}
+
+static int rtw_usb_parse(struct rtw_dev *rtwdev,
+ struct usb_interface *interface)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ struct usb_host_interface *host_interface = &interface->altsetting[0];
+ struct usb_interface_descriptor *interface_desc = &host_interface->desc;
+ struct usb_endpoint_descriptor *endpoint;
+ struct usb_device *usbd = interface_to_usbdev(interface);
+ int num_out_pipes = 0;
+ int i;
+ u8 num;
+
+ for (i = 0; i < interface_desc->bNumEndpoints; i++) {
+ endpoint = &host_interface->endpoint[i].desc;
+ num = usb_endpoint_num(endpoint);
+
+ if (usb_endpoint_dir_in(endpoint) &&
+ usb_endpoint_xfer_bulk(endpoint)) {
+ if (rtwusb->pipe_in) {
+ rtw_err(rtwdev, "IN pipes overflow\n");
+ return -EINVAL;
+ }
+
+ rtwusb->pipe_in = num;
+ }
+
+ if (usb_endpoint_dir_in(endpoint) &&
+ usb_endpoint_xfer_int(endpoint)) {
+ if (rtwusb->pipe_interrupt) {
+ rtw_err(rtwdev, "INT pipes overflow\n");
+ return -EINVAL;
+ }
+
+ rtwusb->pipe_interrupt = num;
+ }
+
+ if (usb_endpoint_dir_out(endpoint) &&
+ usb_endpoint_xfer_bulk(endpoint)) {
+ if (num_out_pipes >= ARRAY_SIZE(rtwusb->out_ep)) {
+ rtw_err(rtwdev, "OUT pipes overflow\n");
+ return -EINVAL;
+ }
+
+ rtwusb->out_ep[num_out_pipes++] = num;
+ }
+ }
+
+ switch (usbd->speed) {
+ case USB_SPEED_LOW:
+ case USB_SPEED_FULL:
+ rtwusb->bulkout_size = RTW_USB_FULL_SPEED_BULK_SIZE;
+ break;
+ case USB_SPEED_HIGH:
+ rtwusb->bulkout_size = RTW_USB_HIGH_SPEED_BULK_SIZE;
+ break;
+ case USB_SPEED_SUPER:
+ rtwusb->bulkout_size = RTW_USB_SUPER_SPEED_BULK_SIZE;
+ break;
+ default:
+ rtw_err(rtwdev, "failed to detect usb speed\n");
+ return -EINVAL;
+ }
+
+ rtwdev->hci.bulkout_num = num_out_pipes;
+
+ switch (num_out_pipes) {
+ case 4:
+ case 3:
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID0] = 2;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID1] = 2;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID2] = 2;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID3] = 2;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID4] = 1;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID5] = 1;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID6] = 0;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID7] = 0;
+ break;
+ case 2:
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID0] = 1;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID1] = 1;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID2] = 1;
+ rtwusb->qsel_to_ep[TX_DESC_QSEL_TID3] = 1;
+ break;
+ case 1:
+ break;
+ default:
+ rtw_err(rtwdev, "failed to get out_pipes(%d)\n", num_out_pipes);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void rtw_usb_write_port_tx_complete(struct urb *urb)
+{
+ struct rtw_usb_txcb *txcb = urb->context;
+ struct rtw_dev *rtwdev = txcb->rtwdev;
+ struct ieee80211_hw *hw = rtwdev->hw;
+
+ while (true) {
+ struct sk_buff *skb = skb_dequeue(&txcb->tx_ack_queue);
+ struct ieee80211_tx_info *info;
+ struct rtw_usb_tx_data *tx_data;
+
+ if (!skb)
+ break;
+
+ info = IEEE80211_SKB_CB(skb);
+ tx_data = rtw_usb_get_tx_data(skb);
+
+ /* enqueue to wait for tx report */
+ if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) {
+ rtw_tx_report_enqueue(rtwdev, skb, tx_data->sn);
+ continue;
+ }
+
+ /* always ACK for others, then they won't be marked as drop */
+ ieee80211_tx_info_clear_status(info);
+ if (info->flags & IEEE80211_TX_CTL_NO_ACK)
+ info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
+ else
+ info->flags |= IEEE80211_TX_STAT_ACK;
+
+ ieee80211_tx_status_irqsafe(hw, skb);
+ }
+
+ kfree(txcb);
+}
+
+static int qsel_to_ep(struct rtw_usb *rtwusb, unsigned int qsel)
+{
+ if (qsel >= ARRAY_SIZE(rtwusb->qsel_to_ep))
+ return 0;
+
+ return rtwusb->qsel_to_ep[qsel];
+}
+
+static int rtw_usb_write_port(struct rtw_dev *rtwdev, u8 qsel, struct sk_buff *skb,
+ usb_complete_t cb, void *context)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ struct usb_device *usbd = rtwusb->udev;
+ struct urb *urb;
+ unsigned int pipe;
+ int ret;
+ int ep = qsel_to_ep(rtwusb, qsel);
+
+ pipe = usb_sndbulkpipe(usbd, rtwusb->out_ep[ep]);
+ urb = usb_alloc_urb(0, GFP_ATOMIC);
+ if (!urb)
+ return -ENOMEM;
+
+ usb_fill_bulk_urb(urb, usbd, pipe, skb->data, skb->len, cb, context);
+ ret = usb_submit_urb(urb, GFP_ATOMIC);
+
+ usb_free_urb(urb);
+
+ return ret;
+}
+
+static bool rtw_usb_tx_agg_skb(struct rtw_usb *rtwusb, struct sk_buff_head *list)
+{
+ struct rtw_dev *rtwdev = rtwusb->rtwdev;
+ struct rtw_usb_txcb *txcb;
+ struct sk_buff *skb_head;
+ struct sk_buff *skb_iter;
+ int agg_num = 0;
+ unsigned int align_next = 0;
+
+ if (skb_queue_empty(list))
+ return false;
+
+ txcb = kmalloc(sizeof(*txcb), GFP_ATOMIC);
+ if (!txcb)
+ return false;
+
+ txcb->rtwdev = rtwdev;
+ skb_queue_head_init(&txcb->tx_ack_queue);
+
+ skb_iter = skb_dequeue(list);
+
+ if (skb_queue_empty(list)) {
+ skb_head = skb_iter;
+ goto queue;
+ }
+
+ skb_head = dev_alloc_skb(RTW_USB_MAX_XMITBUF_SZ);
+ if (!skb_head) {
+ skb_head = skb_iter;
+ goto queue;
+ }
+
+ while (skb_iter) {
+ unsigned long flags;
+
+ skb_put(skb_head, align_next);
+ skb_put_data(skb_head, skb_iter->data, skb_iter->len);
+
+ align_next = ALIGN(skb_iter->len, 8) - skb_iter->len;
+
+ agg_num++;
+
+ skb_queue_tail(&txcb->tx_ack_queue, skb_iter);
+
+ spin_lock_irqsave(&list->lock, flags);
+
+ skb_iter = skb_peek(list);
+
+ if (skb_iter && skb_iter->len + skb_head->len <= RTW_USB_MAX_XMITBUF_SZ)
+ __skb_unlink(skb_iter, list);
+ else
+ skb_iter = NULL;
+ spin_unlock_irqrestore(&list->lock, flags);
+ }
+
+ if (agg_num > 1)
+ rtw_usb_fill_tx_checksum(rtwusb, skb_head, agg_num);
+
+queue:
+ skb_queue_tail(&txcb->tx_ack_queue, skb_head);
+
+ rtw_usb_write_port(rtwdev, GET_TX_DESC_QSEL(skb_head->data), skb_head,
+ rtw_usb_write_port_tx_complete, txcb);
+
+ return true;
+}
+
+static void rtw_usb_tx_handler(struct work_struct *work)
+{
+ struct rtw_usb *rtwusb = container_of(work, struct rtw_usb, tx_work);
+ int i, limit;
+
+ for (i = ARRAY_SIZE(rtwusb->tx_queue) - 1; i >= 0; i--) {
+ for (limit = 0; limit < 200; limit++) {
+ struct sk_buff_head *list = &rtwusb->tx_queue[i];
+
+ if (!rtw_usb_tx_agg_skb(rtwusb, list))
+ break;
+ }
+ }
+}
+
+static void rtw_usb_tx_queue_purge(struct rtw_usb *rtwusb)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(rtwusb->tx_queue); i++)
+ skb_queue_purge(&rtwusb->tx_queue[i]);
+}
+
+static void rtw_usb_write_port_complete(struct urb *urb)
+{
+ struct sk_buff *skb = urb->context;
+
+ dev_kfree_skb_any(skb);
+}
+
+static int rtw_usb_write_data(struct rtw_dev *rtwdev,
+ struct rtw_tx_pkt_info *pkt_info,
+ u8 *buf)
+{
+ const struct rtw_chip_info *chip = rtwdev->chip;
+ struct sk_buff *skb;
+ unsigned int desclen, headsize, size;
+ u8 qsel;
+ int ret = 0;
+
+ size = pkt_info->tx_pkt_size;
+ qsel = pkt_info->qsel;
+ desclen = chip->tx_pkt_desc_sz;
+ headsize = pkt_info->offset ? pkt_info->offset : desclen;
+
+ skb = dev_alloc_skb(headsize + size);
+ if (unlikely(!skb))
+ return -ENOMEM;
+
+ skb_reserve(skb, headsize);
+ skb_put_data(skb, buf, size);
+ skb_push(skb, headsize);
+ memset(skb->data, 0, headsize);
+ rtw_tx_fill_tx_desc(pkt_info, skb);
+ rtw_tx_fill_txdesc_checksum(rtwdev, pkt_info, skb->data);
+
+ ret = rtw_usb_write_port(rtwdev, qsel, skb,
+ rtw_usb_write_port_complete, skb);
+ if (unlikely(ret))
+ rtw_err(rtwdev, "failed to do USB write, ret=%d\n", ret);
+
+ return ret;
+}
+
+static int rtw_usb_write_data_rsvd_page(struct rtw_dev *rtwdev, u8 *buf,
+ u32 size)
+{
+ const struct rtw_chip_info *chip = rtwdev->chip;
+ struct rtw_usb *rtwusb;
+ struct rtw_tx_pkt_info pkt_info = {0};
+ u32 len, desclen;
+
+ rtwusb = rtw_get_usb_priv(rtwdev);
+
+ pkt_info.tx_pkt_size = size;
+ pkt_info.qsel = TX_DESC_QSEL_BEACON;
+
+ desclen = chip->tx_pkt_desc_sz;
+ len = desclen + size;
+ if (len % rtwusb->bulkout_size == 0) {
+ len += RTW_USB_PACKET_OFFSET_SZ;
+ pkt_info.offset = desclen + RTW_USB_PACKET_OFFSET_SZ;
+ pkt_info.pkt_offset = 1;
+ } else {
+ pkt_info.offset = desclen;
+ }
+
+ return rtw_usb_write_data(rtwdev, &pkt_info, buf);
+}
+
+static int rtw_usb_write_data_h2c(struct rtw_dev *rtwdev, u8 *buf, u32 size)
+{
+ struct rtw_tx_pkt_info pkt_info = {0};
+
+ pkt_info.tx_pkt_size = size;
+ pkt_info.qsel = TX_DESC_QSEL_H2C;
+
+ return rtw_usb_write_data(rtwdev, &pkt_info, buf);
+}
+
+static u8 rtw_usb_tx_queue_mapping_to_qsel(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ __le16 fc = hdr->frame_control;
+ u8 qsel;
+
+ if (unlikely(ieee80211_is_mgmt(fc) || ieee80211_is_ctl(fc)))
+ qsel = TX_DESC_QSEL_MGMT;
+ else if (skb_get_queue_mapping(skb) <= IEEE80211_AC_BK)
+ qsel = skb->priority;
+ else
+ qsel = TX_DESC_QSEL_BEACON;
+
+ return qsel;
+}
+
+static int rtw_usb_tx_write(struct rtw_dev *rtwdev,
+ struct rtw_tx_pkt_info *pkt_info,
+ struct sk_buff *skb)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ const struct rtw_chip_info *chip = rtwdev->chip;
+ struct rtw_usb_tx_data *tx_data;
+ u8 *pkt_desc;
+ int ep;
+
+ pkt_desc = skb_push(skb, chip->tx_pkt_desc_sz);
+ memset(pkt_desc, 0, chip->tx_pkt_desc_sz);
+ pkt_info->qsel = rtw_usb_tx_queue_mapping_to_qsel(skb);
+ ep = qsel_to_ep(rtwusb, pkt_info->qsel);
+ rtw_tx_fill_tx_desc(pkt_info, skb);
+ rtw_tx_fill_txdesc_checksum(rtwdev, pkt_info, skb->data);
+ tx_data = rtw_usb_get_tx_data(skb);
+ tx_data->sn = pkt_info->sn;
+
+ skb_queue_tail(&rtwusb->tx_queue[ep], skb);
+
+ return 0;
+}
+
+static void rtw_usb_tx_kick_off(struct rtw_dev *rtwdev)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+
+ queue_work(rtwusb->txwq, &rtwusb->tx_work);
+}
+
+static void rtw_usb_rx_handler(struct work_struct *work)
+{
+ struct rtw_usb *rtwusb = container_of(work, struct rtw_usb, rx_work);
+ struct rtw_dev *rtwdev = rtwusb->rtwdev;
+ const struct rtw_chip_info *chip = rtwdev->chip;
+ struct rtw_rx_pkt_stat pkt_stat;
+ struct ieee80211_rx_status rx_status;
+ struct sk_buff *skb;
+ u32 pkt_desc_sz = chip->rx_pkt_desc_sz;
+ u32 pkt_offset;
+ u8 *rx_desc;
+ int limit;
+
+ for (limit = 0; limit < 200; limit++) {
+ skb = skb_dequeue(&rtwusb->rx_queue);
+ if (!skb)
+ break;
+
+ rx_desc = skb->data;
+ chip->ops->query_rx_desc(rtwdev, rx_desc, &pkt_stat,
+ &rx_status);
+ pkt_offset = pkt_desc_sz + pkt_stat.drv_info_sz +
+ pkt_stat.shift;
+
+ if (pkt_stat.is_c2h) {
+ skb_put(skb, pkt_stat.pkt_len + pkt_offset);
+ rtw_fw_c2h_cmd_rx_irqsafe(rtwdev, pkt_offset, skb);
+ continue;
+ }
+
+ if (skb_queue_len(&rtwusb->rx_queue) >= RTW_USB_MAX_RXQ_LEN) {
+ rtw_err(rtwdev, "failed to get rx_queue, overflow\n");
+ dev_kfree_skb_any(skb);
+ continue;
+ }
+
+ skb_put(skb, pkt_stat.pkt_len);
+ skb_reserve(skb, pkt_offset);
+ memcpy(skb->cb, &rx_status, sizeof(rx_status));
+ ieee80211_rx_irqsafe(rtwdev->hw, skb);
+ }
+}
+
+static void rtw_usb_read_port_complete(struct urb *urb);
+
+static void rtw_usb_rx_resubmit(struct rtw_usb *rtwusb, struct rx_usb_ctrl_block *rxcb)
+{
+ struct rtw_dev *rtwdev = rtwusb->rtwdev;
+ int error;
+
+ rxcb->rx_skb = alloc_skb(RTW_USB_MAX_RECVBUF_SZ, GFP_ATOMIC);
+ if (!rxcb->rx_skb)
+ return;
+
+ usb_fill_bulk_urb(rxcb->rx_urb, rtwusb->udev,
+ usb_rcvbulkpipe(rtwusb->udev, rtwusb->pipe_in),
+ rxcb->rx_skb->data, RTW_USB_MAX_RECVBUF_SZ,
+ rtw_usb_read_port_complete, rxcb);
+
+ error = usb_submit_urb(rxcb->rx_urb, GFP_ATOMIC);
+ if (error) {
+ kfree_skb(rxcb->rx_skb);
+ if (error != -ENODEV)
+ rtw_err(rtwdev, "Err sending rx data urb %d\n",
+ error);
+ }
+}
+
+static void rtw_usb_read_port_complete(struct urb *urb)
+{
+ struct rx_usb_ctrl_block *rxcb = urb->context;
+ struct rtw_dev *rtwdev = rxcb->rtwdev;
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ struct sk_buff *skb = rxcb->rx_skb;
+
+ if (urb->status == 0) {
+ if (urb->actual_length >= RTW_USB_MAX_RECVBUF_SZ ||
+ urb->actual_length < 24) {
+ rtw_err(rtwdev, "failed to get urb length:%d\n",
+ urb->actual_length);
+ if (skb)
+ dev_kfree_skb_any(skb);
+ } else {
+ skb_queue_tail(&rtwusb->rx_queue, skb);
+ queue_work(rtwusb->rxwq, &rtwusb->rx_work);
+ }
+ rtw_usb_rx_resubmit(rtwusb, rxcb);
+ } else {
+ switch (urb->status) {
+ case -EINVAL:
+ case -EPIPE:
+ case -ENODEV:
+ case -ESHUTDOWN:
+ case -ENOENT:
+ case -EPROTO:
+ case -EILSEQ:
+ case -ETIME:
+ case -ECOMM:
+ case -EOVERFLOW:
+ case -EINPROGRESS:
+ break;
+ default:
+ rtw_err(rtwdev, "status %d\n", urb->status);
+ break;
+ }
+ if (skb)
+ dev_kfree_skb_any(skb);
+ }
+}
+
+static void rtw_usb_cancel_rx_bufs(struct rtw_usb *rtwusb)
+{
+ struct rx_usb_ctrl_block *rxcb;
+ int i;
+
+ for (i = 0; i < RTW_USB_RXCB_NUM; i++) {
+ rxcb = &rtwusb->rx_cb[i];
+ if (rxcb->rx_urb)
+ usb_kill_urb(rxcb->rx_urb);
+ }
+}
+
+static void rtw_usb_free_rx_bufs(struct rtw_usb *rtwusb)
+{
+ struct rx_usb_ctrl_block *rxcb;
+ int i;
+
+ for (i = 0; i < RTW_USB_RXCB_NUM; i++) {
+ rxcb = &rtwusb->rx_cb[i];
+ if (rxcb->rx_urb) {
+ usb_kill_urb(rxcb->rx_urb);
+ usb_free_urb(rxcb->rx_urb);
+ }
+ }
+}
+
+static int rtw_usb_alloc_rx_bufs(struct rtw_usb *rtwusb)
+{
+ int i;
+
+ for (i = 0; i < RTW_USB_RXCB_NUM; i++) {
+ struct rx_usb_ctrl_block *rxcb = &rtwusb->rx_cb[i];
+
+ rxcb->n = i;
+ rxcb->rtwdev = rtwusb->rtwdev;
+ rxcb->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!rxcb->rx_urb)
+ goto err;
+ }
+
+ return 0;
+err:
+ rtw_usb_free_rx_bufs(rtwusb);
+ return -ENOMEM;
+}
+
+static int rtw_usb_setup(struct rtw_dev *rtwdev)
+{
+ /* empty function for rtw_hci_ops */
+ return 0;
+}
+
+static int rtw_usb_start(struct rtw_dev *rtwdev)
+{
+ return 0;
+}
+
+static void rtw_usb_stop(struct rtw_dev *rtwdev)
+{
+}
+
+static void rtw_usb_deep_ps(struct rtw_dev *rtwdev, bool enter)
+{
+ /* empty function for rtw_hci_ops */
+}
+
+static void rtw_usb_link_ps(struct rtw_dev *rtwdev, bool enter)
+{
+ /* empty function for rtw_hci_ops */
+}
+
+static void rtw_usb_interface_cfg(struct rtw_dev *rtwdev)
+{
+ /* empty function for rtw_hci_ops */
+}
+
+static struct rtw_hci_ops rtw_usb_ops = {
+ .tx_write = rtw_usb_tx_write,
+ .tx_kick_off = rtw_usb_tx_kick_off,
+ .setup = rtw_usb_setup,
+ .start = rtw_usb_start,
+ .stop = rtw_usb_stop,
+ .deep_ps = rtw_usb_deep_ps,
+ .link_ps = rtw_usb_link_ps,
+ .interface_cfg = rtw_usb_interface_cfg,
+
+ .write8 = rtw_usb_write8,
+ .write16 = rtw_usb_write16,
+ .write32 = rtw_usb_write32,
+ .read8 = rtw_usb_read8,
+ .read16 = rtw_usb_read16,
+ .read32 = rtw_usb_read32,
+
+ .write_data_rsvd_page = rtw_usb_write_data_rsvd_page,
+ .write_data_h2c = rtw_usb_write_data_h2c,
+};
+
+static int rtw_usb_init_rx(struct rtw_dev *rtwdev)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ int i;
+
+ rtwusb->rxwq = create_singlethread_workqueue("rtw88_usb: rx wq");
+ if (!rtwusb->rxwq) {
+ rtw_err(rtwdev, "failed to create RX work queue\n");
+ return -ENOMEM;
+ }
+
+ skb_queue_head_init(&rtwusb->rx_queue);
+
+ INIT_WORK(&rtwusb->rx_work, rtw_usb_rx_handler);
+
+ for (i = 0; i < RTW_USB_RXCB_NUM; i++) {
+ struct rx_usb_ctrl_block *rxcb = &rtwusb->rx_cb[i];
+
+ rtw_usb_rx_resubmit(rtwusb, rxcb);
+ }
+
+ return 0;
+}
+
+static void rtw_usb_deinit_rx(struct rtw_dev *rtwdev)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+
+ skb_queue_purge(&rtwusb->rx_queue);
+
+ flush_workqueue(rtwusb->rxwq);
+ destroy_workqueue(rtwusb->rxwq);
+}
+
+static int rtw_usb_init_tx(struct rtw_dev *rtwdev)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ int i;
+
+ rtwusb->txwq = create_singlethread_workqueue("rtw88_usb: tx wq");
+ if (!rtwusb->txwq) {
+ rtw_err(rtwdev, "failed to create TX work queue\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(rtwusb->tx_queue); i++)
+ skb_queue_head_init(&rtwusb->tx_queue[i]);
+
+ INIT_WORK(&rtwusb->tx_work, rtw_usb_tx_handler);
+
+ return 0;
+}
+
+static void rtw_usb_deinit_tx(struct rtw_dev *rtwdev)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+
+ rtw_usb_tx_queue_purge(rtwusb);
+ flush_workqueue(rtwusb->txwq);
+ destroy_workqueue(rtwusb->txwq);
+}
+
+static int rtw_usb_intf_init(struct rtw_dev *rtwdev,
+ struct usb_interface *intf)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ struct usb_device *udev = usb_get_dev(interface_to_usbdev(intf));
+ int ret;
+
+ rtwusb->udev = udev;
+ ret = rtw_usb_parse(rtwdev, intf);
+ if (ret)
+ return ret;
+
+ rtwusb->usb_data = kcalloc(RTW_USB_MAX_RXTX_COUNT, sizeof(u32),
+ GFP_KERNEL);
+ if (!rtwusb->usb_data)
+ return -ENOMEM;
+
+ usb_set_intfdata(intf, rtwdev->hw);
+
+ SET_IEEE80211_DEV(rtwdev->hw, &intf->dev);
+ spin_lock_init(&rtwusb->usb_lock);
+
+ return 0;
+}
+
+static void rtw_usb_intf_deinit(struct rtw_dev *rtwdev,
+ struct usb_interface *intf)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+
+ usb_put_dev(rtwusb->udev);
+ usb_set_intfdata(intf, NULL);
+}
+
+int rtw_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+ struct rtw_dev *rtwdev;
+ struct ieee80211_hw *hw;
+ struct rtw_usb *rtwusb;
+ int drv_data_size;
+ int ret;
+
+ drv_data_size = sizeof(struct rtw_dev) + sizeof(struct rtw_usb);
+ hw = ieee80211_alloc_hw(drv_data_size, &rtw_ops);
+ if (!hw)
+ return -ENOMEM;
+
+ rtwdev = hw->priv;
+ rtwdev->hw = hw;
+ rtwdev->dev = &intf->dev;
+ rtwdev->chip = (struct rtw_chip_info *)id->driver_info;
+ rtwdev->hci.ops = &rtw_usb_ops;
+ rtwdev->hci.type = RTW_HCI_TYPE_USB;
+
+ rtwusb = rtw_get_usb_priv(rtwdev);
+ rtwusb->rtwdev = rtwdev;
+
+ ret = rtw_usb_alloc_rx_bufs(rtwusb);
+ if (ret)
+ return ret;
+
+ ret = rtw_core_init(rtwdev);
+ if (ret)
+ goto err_release_hw;
+
+ ret = rtw_usb_intf_init(rtwdev, intf);
+ if (ret) {
+ rtw_err(rtwdev, "failed to init USB interface\n");
+ goto err_deinit_core;
+ }
+
+ ret = rtw_usb_init_tx(rtwdev);
+ if (ret) {
+ rtw_err(rtwdev, "failed to init USB TX\n");
+ goto err_destroy_usb;
+ }
+
+ ret = rtw_usb_init_rx(rtwdev);
+ if (ret) {
+ rtw_err(rtwdev, "failed to init USB RX\n");
+ goto err_destroy_txwq;
+ }
+
+ ret = rtw_chip_info_setup(rtwdev);
+ if (ret) {
+ rtw_err(rtwdev, "failed to setup chip information\n");
+ goto err_destroy_rxwq;
+ }
+
+ ret = rtw_register_hw(rtwdev, rtwdev->hw);
+ if (ret) {
+ rtw_err(rtwdev, "failed to register hw\n");
+ goto err_destroy_rxwq;
+ }
+
+ return 0;
+
+err_destroy_rxwq:
+ rtw_usb_deinit_rx(rtwdev);
+
+err_destroy_txwq:
+ rtw_usb_deinit_tx(rtwdev);
+
+err_destroy_usb:
+ rtw_usb_intf_deinit(rtwdev, intf);
+
+err_deinit_core:
+ rtw_core_deinit(rtwdev);
+
+err_release_hw:
+ ieee80211_free_hw(hw);
+
+ return ret;
+}
+EXPORT_SYMBOL(rtw_usb_probe);
+
+void rtw_usb_disconnect(struct usb_interface *intf)
+{
+ struct ieee80211_hw *hw = usb_get_intfdata(intf);
+ struct rtw_dev *rtwdev;
+ struct rtw_usb *rtwusb;
+
+ if (!hw)
+ return;
+
+ rtwdev = hw->priv;
+ rtwusb = rtw_get_usb_priv(rtwdev);
+
+ rtw_usb_cancel_rx_bufs(rtwusb);
+
+ rtw_unregister_hw(rtwdev, hw);
+ rtw_usb_deinit_tx(rtwdev);
+ rtw_usb_deinit_rx(rtwdev);
+
+ if (rtwusb->udev->state != USB_STATE_NOTATTACHED)
+ usb_reset_device(rtwusb->udev);
+
+ rtw_usb_free_rx_bufs(rtwusb);
+
+ rtw_usb_intf_deinit(rtwdev, intf);
+ rtw_core_deinit(rtwdev);
+ ieee80211_free_hw(hw);
+}
+EXPORT_SYMBOL(rtw_usb_disconnect);
+
+MODULE_AUTHOR("Realtek Corporation");
+MODULE_DESCRIPTION("Realtek 802.11ac wireless USB driver");
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/net/wireless/realtek/rtw88/usb.h b/drivers/net/wireless/realtek/rtw88/usb.h
new file mode 100644
index 0000000000000..30647f0dd61c6
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw88/usb.h
@@ -0,0 +1,107 @@
+/* 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
--
2.30.2