Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/usb/cdns3/ep0.c b/drivers/usb/cdns3/ep0.c
new file mode 100644
index 0000000..e71240b
--- /dev/null
+++ b/drivers/usb/cdns3/ep0.c
@@ -0,0 +1,892 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver - gadget side.
+ *
+ * Copyright (C) 2018 Cadence Design Systems.
+ * Copyright (C) 2017-2018 NXP
+ *
+ * Authors: Pawel Jez <pjez@cadence.com>,
+ * Pawel Laszczak <pawell@cadence.com>
+ * Peter Chen <peter.chen@nxp.com>
+ */
+
+#include <linux/usb/composite.h>
+#include <linux/iopoll.h>
+
+#include "gadget.h"
+#include "trace.h"
+
+static struct usb_endpoint_descriptor cdns3_gadget_ep0_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+};
+
+/**
+ * cdns3_ep0_run_transfer - Do transfer on default endpoint hardware
+ * @priv_dev: extended gadget object
+ * @dma_addr: physical address where data is/will be stored
+ * @length: data length
+ * @erdy: set it to 1 when ERDY packet should be sent -
+ * exit from flow control state
+ */
+static void cdns3_ep0_run_transfer(struct cdns3_device *priv_dev,
+ dma_addr_t dma_addr,
+ unsigned int length, int erdy, int zlp)
+{
+ struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
+ struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+
+ priv_ep->trb_pool[0].buffer = TRB_BUFFER(dma_addr);
+ priv_ep->trb_pool[0].length = TRB_LEN(length);
+
+ if (zlp) {
+ priv_ep->trb_pool[0].control = TRB_CYCLE | TRB_TYPE(TRB_NORMAL);
+ priv_ep->trb_pool[1].buffer = TRB_BUFFER(dma_addr);
+ priv_ep->trb_pool[1].length = TRB_LEN(0);
+ priv_ep->trb_pool[1].control = TRB_CYCLE | TRB_IOC |
+ TRB_TYPE(TRB_NORMAL);
+ } else {
+ priv_ep->trb_pool[0].control = TRB_CYCLE | TRB_IOC |
+ TRB_TYPE(TRB_NORMAL);
+ priv_ep->trb_pool[1].control = 0;
+ }
+
+ trace_cdns3_prepare_trb(priv_ep, priv_ep->trb_pool);
+
+ cdns3_select_ep(priv_dev, priv_dev->ep0_data_dir);
+
+ writel(EP_STS_TRBERR, ®s->ep_sts);
+ writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma), ®s->ep_traddr);
+ trace_cdns3_doorbell_ep0(priv_dev->ep0_data_dir ? "ep0in" : "ep0out",
+ readl(®s->ep_traddr));
+
+ /* TRB should be prepared before starting transfer. */
+ writel(EP_CMD_DRDY, ®s->ep_cmd);
+
+ /* Resume controller before arming transfer. */
+ __cdns3_gadget_wakeup(priv_dev);
+
+ if (erdy)
+ writel(EP_CMD_ERDY, &priv_dev->regs->ep_cmd);
+}
+
+/**
+ * cdns3_ep0_delegate_req - Returns status of handling setup packet
+ * Setup is handled by gadget driver
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns zero on success or negative value on failure
+ */
+static int cdns3_ep0_delegate_req(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl_req)
+{
+ int ret;
+
+ spin_unlock(&priv_dev->lock);
+ priv_dev->setup_pending = 1;
+ ret = priv_dev->gadget_driver->setup(&priv_dev->gadget, ctrl_req);
+ priv_dev->setup_pending = 0;
+ spin_lock(&priv_dev->lock);
+ return ret;
+}
+
+static void cdns3_prepare_setup_packet(struct cdns3_device *priv_dev)
+{
+ priv_dev->ep0_data_dir = 0;
+ priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
+ cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
+ sizeof(struct usb_ctrlrequest), 0, 0);
+}
+
+static void cdns3_ep0_complete_setup(struct cdns3_device *priv_dev,
+ u8 send_stall, u8 send_erdy)
+{
+ struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+ struct usb_request *request;
+
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+ if (request)
+ list_del_init(&request->list);
+
+ if (send_stall) {
+ trace_cdns3_halt(priv_ep, send_stall, 0);
+ /* set_stall on ep0 */
+ cdns3_select_ep(priv_dev, 0x00);
+ writel(EP_CMD_SSTALL, &priv_dev->regs->ep_cmd);
+ } else {
+ cdns3_prepare_setup_packet(priv_dev);
+ }
+
+ priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
+ writel((send_erdy ? EP_CMD_ERDY : 0) | EP_CMD_REQ_CMPL,
+ &priv_dev->regs->ep_cmd);
+
+ cdns3_allow_enable_l1(priv_dev, 1);
+}
+
+/**
+ * cdns3_req_ep0_set_configuration - Handling of SET_CONFIG standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, USB_GADGET_DELAYED_STATUS on deferred status stage,
+ * error code on error
+ */
+static int cdns3_req_ep0_set_configuration(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl_req)
+{
+ enum usb_device_state device_state = priv_dev->gadget.state;
+ struct cdns3_endpoint *priv_ep;
+ u32 config = le16_to_cpu(ctrl_req->wValue);
+ int result = 0;
+ int i;
+
+ switch (device_state) {
+ case USB_STATE_ADDRESS:
+ /* Configure non-control EPs */
+ for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
+ priv_ep = priv_dev->eps[i];
+ if (!priv_ep)
+ continue;
+
+ if (priv_ep->flags & EP_CLAIMED)
+ cdns3_ep_config(priv_ep);
+ }
+
+ result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
+
+ if (result)
+ return result;
+
+ if (config) {
+ cdns3_set_hw_configuration(priv_dev);
+ } else {
+ cdns3_hw_reset_eps_config(priv_dev);
+ usb_gadget_set_state(&priv_dev->gadget,
+ USB_STATE_ADDRESS);
+ }
+ break;
+ case USB_STATE_CONFIGURED:
+ result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
+
+ if (!config && !result) {
+ cdns3_hw_reset_eps_config(priv_dev);
+ usb_gadget_set_state(&priv_dev->gadget,
+ USB_STATE_ADDRESS);
+ }
+ break;
+ default:
+ result = -EINVAL;
+ }
+
+ return result;
+}
+
+/**
+ * cdns3_req_ep0_set_address - Handling of SET_ADDRESS standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_set_address(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl_req)
+{
+ enum usb_device_state device_state = priv_dev->gadget.state;
+ u32 reg;
+ u32 addr;
+
+ addr = le16_to_cpu(ctrl_req->wValue);
+
+ if (addr > USB_DEVICE_MAX_ADDRESS) {
+ dev_err(priv_dev->dev,
+ "Device address (%d) cannot be greater than %d\n",
+ addr, USB_DEVICE_MAX_ADDRESS);
+ return -EINVAL;
+ }
+
+ if (device_state == USB_STATE_CONFIGURED) {
+ dev_err(priv_dev->dev,
+ "can't set_address from configured state\n");
+ return -EINVAL;
+ }
+
+ reg = readl(&priv_dev->regs->usb_cmd);
+
+ writel(reg | USB_CMD_FADDR(addr) | USB_CMD_SET_ADDR,
+ &priv_dev->regs->usb_cmd);
+
+ usb_gadget_set_state(&priv_dev->gadget,
+ (addr ? USB_STATE_ADDRESS : USB_STATE_DEFAULT));
+
+ return 0;
+}
+
+/**
+ * cdns3_req_ep0_get_status - Handling of GET_STATUS standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_get_status(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl)
+{
+ struct cdns3_endpoint *priv_ep;
+ __le16 *response_pkt;
+ u16 usb_status = 0;
+ u32 recip;
+ u8 index;
+
+ recip = ctrl->bRequestType & USB_RECIP_MASK;
+
+ switch (recip) {
+ case USB_RECIP_DEVICE:
+ /* self powered */
+ if (priv_dev->is_selfpowered)
+ usb_status = BIT(USB_DEVICE_SELF_POWERED);
+
+ if (priv_dev->wake_up_flag)
+ usb_status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
+
+ if (priv_dev->gadget.speed != USB_SPEED_SUPER)
+ break;
+
+ if (priv_dev->u1_allowed)
+ usb_status |= BIT(USB_DEV_STAT_U1_ENABLED);
+
+ if (priv_dev->u2_allowed)
+ usb_status |= BIT(USB_DEV_STAT_U2_ENABLED);
+
+ break;
+ case USB_RECIP_INTERFACE:
+ return cdns3_ep0_delegate_req(priv_dev, ctrl);
+ case USB_RECIP_ENDPOINT:
+ index = cdns3_ep_addr_to_index(ctrl->wIndex);
+ priv_ep = priv_dev->eps[index];
+
+ /* check if endpoint is stalled or stall is pending */
+ cdns3_select_ep(priv_dev, ctrl->wIndex);
+ if (EP_STS_STALL(readl(&priv_dev->regs->ep_sts)) ||
+ (priv_ep->flags & EP_STALL_PENDING))
+ usb_status = BIT(USB_ENDPOINT_HALT);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ response_pkt = (__le16 *)priv_dev->setup_buf;
+ *response_pkt = cpu_to_le16(usb_status);
+
+ cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
+ sizeof(*response_pkt), 1, 0);
+ return 0;
+}
+
+static int cdns3_ep0_feature_handle_device(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl,
+ int set)
+{
+ enum usb_device_state state;
+ enum usb_device_speed speed;
+ int ret = 0;
+ u32 wValue;
+ u16 tmode;
+
+ wValue = le16_to_cpu(ctrl->wValue);
+ state = priv_dev->gadget.state;
+ speed = priv_dev->gadget.speed;
+
+ switch (wValue) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ priv_dev->wake_up_flag = !!set;
+ break;
+ case USB_DEVICE_U1_ENABLE:
+ if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
+ return -EINVAL;
+
+ priv_dev->u1_allowed = !!set;
+ break;
+ case USB_DEVICE_U2_ENABLE:
+ if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
+ return -EINVAL;
+
+ priv_dev->u2_allowed = !!set;
+ break;
+ case USB_DEVICE_LTM_ENABLE:
+ ret = -EINVAL;
+ break;
+ case USB_DEVICE_TEST_MODE:
+ if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
+ return -EINVAL;
+
+ tmode = le16_to_cpu(ctrl->wIndex);
+
+ if (!set || (tmode & 0xff) != 0)
+ return -EINVAL;
+
+ switch (tmode >> 8) {
+ case TEST_J:
+ case TEST_K:
+ case TEST_SE0_NAK:
+ case TEST_PACKET:
+ cdns3_ep0_complete_setup(priv_dev, 0, 1);
+ /**
+ * Little delay to give the controller some time
+ * for sending status stage.
+ * This time should be less then 3ms.
+ */
+ mdelay(1);
+ cdns3_set_register_bit(&priv_dev->regs->usb_cmd,
+ USB_CMD_STMODE |
+ USB_STS_TMODE_SEL(tmode - 1));
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int cdns3_ep0_feature_handle_intf(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl,
+ int set)
+{
+ u32 wValue;
+ int ret = 0;
+
+ wValue = le16_to_cpu(ctrl->wValue);
+
+ switch (wValue) {
+ case USB_INTRF_FUNC_SUSPEND:
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int cdns3_ep0_feature_handle_endpoint(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl,
+ int set)
+{
+ struct cdns3_endpoint *priv_ep;
+ int ret = 0;
+ u8 index;
+
+ if (le16_to_cpu(ctrl->wValue) != USB_ENDPOINT_HALT)
+ return -EINVAL;
+
+ if (!(ctrl->wIndex & ~USB_DIR_IN))
+ return 0;
+
+ index = cdns3_ep_addr_to_index(ctrl->wIndex);
+ priv_ep = priv_dev->eps[index];
+
+ cdns3_select_ep(priv_dev, ctrl->wIndex);
+
+ if (set)
+ __cdns3_gadget_ep_set_halt(priv_ep);
+ else if (!(priv_ep->flags & EP_WEDGE))
+ ret = __cdns3_gadget_ep_clear_halt(priv_ep);
+
+ cdns3_select_ep(priv_dev, 0x00);
+
+ return ret;
+}
+
+/**
+ * cdns3_req_ep0_handle_feature -
+ * Handling of GET/SET_FEATURE standard USB request
+ *
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ * @set: must be set to 1 for SET_FEATURE request
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_handle_feature(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl,
+ int set)
+{
+ int ret = 0;
+ u32 recip;
+
+ recip = ctrl->bRequestType & USB_RECIP_MASK;
+
+ switch (recip) {
+ case USB_RECIP_DEVICE:
+ ret = cdns3_ep0_feature_handle_device(priv_dev, ctrl, set);
+ break;
+ case USB_RECIP_INTERFACE:
+ ret = cdns3_ep0_feature_handle_intf(priv_dev, ctrl, set);
+ break;
+ case USB_RECIP_ENDPOINT:
+ ret = cdns3_ep0_feature_handle_endpoint(priv_dev, ctrl, set);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+/**
+ * cdns3_req_ep0_set_sel - Handling of SET_SEL standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_set_sel(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl_req)
+{
+ if (priv_dev->gadget.state < USB_STATE_ADDRESS)
+ return -EINVAL;
+
+ if (ctrl_req->wLength != 6) {
+ dev_err(priv_dev->dev, "Set SEL should be 6 bytes, got %d\n",
+ ctrl_req->wLength);
+ return -EINVAL;
+ }
+
+ cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma, 6, 1, 0);
+ return 0;
+}
+
+/**
+ * cdns3_req_ep0_set_isoch_delay -
+ * Handling of GET_ISOCH_DELAY standard USB request
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_req_ep0_set_isoch_delay(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl_req)
+{
+ if (ctrl_req->wIndex || ctrl_req->wLength)
+ return -EINVAL;
+
+ priv_dev->isoch_delay = ctrl_req->wValue;
+
+ return 0;
+}
+
+/**
+ * cdns3_ep0_standard_request - Handling standard USB requests
+ * @priv_dev: extended gadget object
+ * @ctrl_req: pointer to received setup packet
+ *
+ * Returns 0 if success, error code on error
+ */
+static int cdns3_ep0_standard_request(struct cdns3_device *priv_dev,
+ struct usb_ctrlrequest *ctrl_req)
+{
+ int ret;
+
+ switch (ctrl_req->bRequest) {
+ case USB_REQ_SET_ADDRESS:
+ ret = cdns3_req_ep0_set_address(priv_dev, ctrl_req);
+ break;
+ case USB_REQ_SET_CONFIGURATION:
+ ret = cdns3_req_ep0_set_configuration(priv_dev, ctrl_req);
+ break;
+ case USB_REQ_GET_STATUS:
+ ret = cdns3_req_ep0_get_status(priv_dev, ctrl_req);
+ break;
+ case USB_REQ_CLEAR_FEATURE:
+ ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 0);
+ break;
+ case USB_REQ_SET_FEATURE:
+ ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 1);
+ break;
+ case USB_REQ_SET_SEL:
+ ret = cdns3_req_ep0_set_sel(priv_dev, ctrl_req);
+ break;
+ case USB_REQ_SET_ISOCH_DELAY:
+ ret = cdns3_req_ep0_set_isoch_delay(priv_dev, ctrl_req);
+ break;
+ default:
+ ret = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
+ break;
+ }
+
+ return ret;
+}
+
+static void __pending_setup_status_handler(struct cdns3_device *priv_dev)
+{
+ struct usb_request *request = priv_dev->pending_status_request;
+
+ if (priv_dev->status_completion_no_call && request &&
+ request->complete) {
+ request->complete(&priv_dev->eps[0]->endpoint, request);
+ priv_dev->status_completion_no_call = 0;
+ }
+}
+
+void cdns3_pending_setup_status_handler(struct work_struct *work)
+{
+ struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
+ pending_status_wq);
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ __pending_setup_status_handler(priv_dev);
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+}
+
+/**
+ * cdns3_ep0_setup_phase - Handling setup USB requests
+ * @priv_dev: extended gadget object
+ */
+static void cdns3_ep0_setup_phase(struct cdns3_device *priv_dev)
+{
+ struct usb_ctrlrequest *ctrl = priv_dev->setup_buf;
+ struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+ int result;
+
+ priv_dev->ep0_data_dir = ctrl->bRequestType & USB_DIR_IN;
+
+ trace_cdns3_ctrl_req(ctrl);
+
+ if (!list_empty(&priv_ep->pending_req_list)) {
+ struct usb_request *request;
+
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+ priv_ep->dir = priv_dev->ep0_data_dir;
+ cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
+ -ECONNRESET);
+ }
+
+ if (le16_to_cpu(ctrl->wLength))
+ priv_dev->ep0_stage = CDNS3_DATA_STAGE;
+ else
+ priv_dev->ep0_stage = CDNS3_STATUS_STAGE;
+
+ if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
+ result = cdns3_ep0_standard_request(priv_dev, ctrl);
+ else
+ result = cdns3_ep0_delegate_req(priv_dev, ctrl);
+
+ if (result == USB_GADGET_DELAYED_STATUS)
+ return;
+
+ if (result < 0)
+ cdns3_ep0_complete_setup(priv_dev, 1, 1);
+ else if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE)
+ cdns3_ep0_complete_setup(priv_dev, 0, 1);
+}
+
+static void cdns3_transfer_completed(struct cdns3_device *priv_dev)
+{
+ struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
+
+ if (!list_empty(&priv_ep->pending_req_list)) {
+ struct usb_request *request;
+
+ trace_cdns3_complete_trb(priv_ep, priv_ep->trb_pool);
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+
+ request->actual =
+ TRB_LEN(le32_to_cpu(priv_ep->trb_pool->length));
+
+ priv_ep->dir = priv_dev->ep0_data_dir;
+ cdns3_gadget_giveback(priv_ep, to_cdns3_request(request), 0);
+ }
+
+ cdns3_ep0_complete_setup(priv_dev, 0, 0);
+}
+
+/**
+ * cdns3_check_new_setup - Check if controller receive new SETUP packet.
+ * @priv_dev: extended gadget object
+ *
+ * The SETUP packet can be kept in on-chip memory or in system memory.
+ */
+static bool cdns3_check_new_setup(struct cdns3_device *priv_dev)
+{
+ u32 ep_sts_reg;
+
+ cdns3_select_ep(priv_dev, 0 | USB_DIR_OUT);
+ ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+
+ return !!(ep_sts_reg & (EP_STS_SETUP | EP_STS_STPWAIT));
+}
+
+/**
+ * cdns3_check_ep0_interrupt_proceed - Processes interrupt related to endpoint 0
+ * @priv_dev: extended gadget object
+ * @dir: USB_DIR_IN for IN direction, USB_DIR_OUT for OUT direction
+ */
+void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir)
+{
+ u32 ep_sts_reg;
+
+ cdns3_select_ep(priv_dev, dir);
+
+ ep_sts_reg = readl(&priv_dev->regs->ep_sts);
+ writel(ep_sts_reg, &priv_dev->regs->ep_sts);
+
+ trace_cdns3_ep0_irq(priv_dev, ep_sts_reg);
+
+ __pending_setup_status_handler(priv_dev);
+
+ if (ep_sts_reg & EP_STS_SETUP)
+ priv_dev->wait_for_setup = 1;
+
+ if (priv_dev->wait_for_setup && ep_sts_reg & EP_STS_IOC) {
+ priv_dev->wait_for_setup = 0;
+ cdns3_allow_enable_l1(priv_dev, 0);
+ cdns3_ep0_setup_phase(priv_dev);
+ } else if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
+ priv_dev->ep0_data_dir = dir;
+ cdns3_transfer_completed(priv_dev);
+ }
+
+ if (ep_sts_reg & EP_STS_DESCMIS) {
+ if (dir == 0 && !priv_dev->setup_pending)
+ cdns3_prepare_setup_packet(priv_dev);
+ }
+}
+
+/**
+ * cdns3_gadget_ep0_enable
+ * Function shouldn't be called by gadget driver,
+ * endpoint 0 is allways active
+ */
+static int cdns3_gadget_ep0_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ return -EINVAL;
+}
+
+/**
+ * cdns3_gadget_ep0_disable
+ * Function shouldn't be called by gadget driver,
+ * endpoint 0 is allways active
+ */
+static int cdns3_gadget_ep0_disable(struct usb_ep *ep)
+{
+ return -EINVAL;
+}
+
+/**
+ * cdns3_gadget_ep0_set_halt
+ * @ep: pointer to endpoint zero object
+ * @value: 1 for set stall, 0 for clear stall
+ *
+ * Returns 0
+ */
+static int cdns3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
+{
+ /* TODO */
+ return 0;
+}
+
+/**
+ * cdns3_gadget_ep0_queue Transfer data on endpoint zero
+ * @ep: pointer to endpoint zero object
+ * @request: pointer to request object
+ * @gfp_flags: gfp flags
+ *
+ * Returns 0 on success, error code elsewhere
+ */
+static int cdns3_gadget_ep0_queue(struct usb_ep *ep,
+ struct usb_request *request,
+ gfp_t gfp_flags)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+ unsigned long flags;
+ int erdy_sent = 0;
+ int ret = 0;
+ u8 zlp = 0;
+
+ trace_cdns3_ep0_queue(priv_dev, request);
+
+ /* cancel the request if controller receive new SETUP packet. */
+ if (cdns3_check_new_setup(priv_dev))
+ return -ECONNRESET;
+
+ /* send STATUS stage. Should be called only for SET_CONFIGURATION */
+ if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE) {
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ cdns3_select_ep(priv_dev, 0x00);
+
+ erdy_sent = !priv_dev->hw_configured_flag;
+ cdns3_set_hw_configuration(priv_dev);
+
+ if (!erdy_sent)
+ cdns3_ep0_complete_setup(priv_dev, 0, 1);
+
+ cdns3_allow_enable_l1(priv_dev, 1);
+
+ request->actual = 0;
+ priv_dev->status_completion_no_call = true;
+ priv_dev->pending_status_request = request;
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ /*
+ * Since there is no completion interrupt for status stage,
+ * it needs to call ->completion in software after
+ * ep0_queue is back.
+ */
+ queue_work(system_freezable_wq, &priv_dev->pending_status_wq);
+ return 0;
+ }
+
+ spin_lock_irqsave(&priv_dev->lock, flags);
+ if (!list_empty(&priv_ep->pending_req_list)) {
+ dev_err(priv_dev->dev,
+ "can't handle multiple requests for ep0\n");
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ return -EBUSY;
+ }
+
+ ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
+ priv_dev->ep0_data_dir);
+ if (ret) {
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+ dev_err(priv_dev->dev, "failed to map request\n");
+ return -EINVAL;
+ }
+
+ request->status = -EINPROGRESS;
+ list_add_tail(&request->list, &priv_ep->pending_req_list);
+
+ if (request->zero && request->length &&
+ (request->length % ep->maxpacket == 0))
+ zlp = 1;
+
+ cdns3_ep0_run_transfer(priv_dev, request->dma, request->length, 1, zlp);
+
+ spin_unlock_irqrestore(&priv_dev->lock, flags);
+
+ return ret;
+}
+
+/**
+ * cdns3_gadget_ep_set_wedge Set wedge on selected endpoint
+ * @ep: endpoint object
+ *
+ * Returns 0
+ */
+int cdns3_gadget_ep_set_wedge(struct usb_ep *ep)
+{
+ struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
+ struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
+
+ dev_dbg(priv_dev->dev, "Wedge for %s\n", ep->name);
+ cdns3_gadget_ep_set_halt(ep, 1);
+ priv_ep->flags |= EP_WEDGE;
+
+ return 0;
+}
+
+const struct usb_ep_ops cdns3_gadget_ep0_ops = {
+ .enable = cdns3_gadget_ep0_enable,
+ .disable = cdns3_gadget_ep0_disable,
+ .alloc_request = cdns3_gadget_ep_alloc_request,
+ .free_request = cdns3_gadget_ep_free_request,
+ .queue = cdns3_gadget_ep0_queue,
+ .dequeue = cdns3_gadget_ep_dequeue,
+ .set_halt = cdns3_gadget_ep0_set_halt,
+ .set_wedge = cdns3_gadget_ep_set_wedge,
+};
+
+/**
+ * cdns3_ep0_config - Configures default endpoint
+ * @priv_dev: extended gadget object
+ *
+ * Functions sets parameters: maximal packet size and enables interrupts
+ */
+void cdns3_ep0_config(struct cdns3_device *priv_dev)
+{
+ struct cdns3_usb_regs __iomem *regs;
+ struct cdns3_endpoint *priv_ep;
+ u32 max_packet_size = 64;
+
+ regs = priv_dev->regs;
+
+ if (priv_dev->gadget.speed == USB_SPEED_SUPER)
+ max_packet_size = 512;
+
+ priv_ep = priv_dev->eps[0];
+
+ if (!list_empty(&priv_ep->pending_req_list)) {
+ struct usb_request *request;
+
+ request = cdns3_next_request(&priv_ep->pending_req_list);
+ list_del_init(&request->list);
+ }
+
+ priv_dev->u1_allowed = 0;
+ priv_dev->u2_allowed = 0;
+
+ priv_dev->gadget.ep0->maxpacket = max_packet_size;
+ cdns3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(max_packet_size);
+
+ /* init ep out */
+ cdns3_select_ep(priv_dev, USB_DIR_OUT);
+
+ if (priv_dev->dev_ver >= DEV_VER_V3) {
+ cdns3_set_register_bit(&priv_dev->regs->dtrans,
+ BIT(0) | BIT(16));
+ cdns3_set_register_bit(&priv_dev->regs->tdl_from_trb,
+ BIT(0) | BIT(16));
+ }
+
+ writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
+ ®s->ep_cfg);
+
+ writel(EP_STS_EN_SETUPEN | EP_STS_EN_DESCMISEN | EP_STS_EN_TRBERREN,
+ ®s->ep_sts_en);
+
+ /* init ep in */
+ cdns3_select_ep(priv_dev, USB_DIR_IN);
+
+ writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
+ ®s->ep_cfg);
+
+ writel(EP_STS_EN_SETUPEN | EP_STS_EN_TRBERREN, ®s->ep_sts_en);
+
+ cdns3_set_register_bit(®s->usb_conf, USB_CONF_U1DS | USB_CONF_U2DS);
+}
+
+/**
+ * cdns3_init_ep0 Initializes software endpoint 0 of gadget
+ * @priv_dev: extended gadget object
+ * @ep_priv: extended endpoint object
+ *
+ * Returns 0 on success else error code.
+ */
+int cdns3_init_ep0(struct cdns3_device *priv_dev,
+ struct cdns3_endpoint *priv_ep)
+{
+ sprintf(priv_ep->name, "ep0");
+
+ /* fill linux fields */
+ priv_ep->endpoint.ops = &cdns3_gadget_ep0_ops;
+ priv_ep->endpoint.maxburst = 1;
+ usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
+ CDNS3_EP0_MAX_PACKET_LIMIT);
+ priv_ep->endpoint.address = 0;
+ priv_ep->endpoint.caps.type_control = 1;
+ priv_ep->endpoint.caps.dir_in = 1;
+ priv_ep->endpoint.caps.dir_out = 1;
+ priv_ep->endpoint.name = priv_ep->name;
+ priv_ep->endpoint.desc = &cdns3_gadget_ep0_desc;
+ priv_dev->gadget.ep0 = &priv_ep->endpoint;
+ priv_ep->type = USB_ENDPOINT_XFER_CONTROL;
+
+ return cdns3_allocate_trb_pool(priv_ep);
+}