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- // 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 <[email protected]>,
- * Pawel Laszczak <[email protected]>
- * Peter Chen <[email protected]>
- */
- #include <linux/usb/composite.h>
- #include <linux/iopoll.h>
- #include "cdns3-gadget.h"
- #include "cdns3-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
- * @zlp: add zero length packet
- */
- 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 = cpu_to_le32(TRB_BUFFER(dma_addr));
- priv_ep->trb_pool[0].length = cpu_to_le32(TRB_LEN(length));
- if (zlp) {
- priv_ep->trb_pool[0].control = cpu_to_le32(TRB_CYCLE | TRB_TYPE(TRB_NORMAL));
- priv_ep->trb_pool[1].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
- priv_ep->trb_pool[1].length = cpu_to_le32(TRB_LEN(0));
- priv_ep->trb_pool[1].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
- TRB_TYPE(TRB_NORMAL));
- } else {
- priv_ep->trb_pool[0].control = cpu_to_le32(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_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;
- u32 config = le16_to_cpu(ctrl_req->wValue);
- int result = 0;
- switch (device_state) {
- case USB_STATE_ADDRESS:
- result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
- if (result || !config)
- goto reset_config;
- break;
- case USB_STATE_CONFIGURED:
- result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
- if (!config && !result)
- goto reset_config;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- reset_config:
- if (result != USB_GADGET_DELAYED_STATUS)
- cdns3_hw_reset_eps_config(priv_dev);
- usb_gadget_set_state(&priv_dev->gadget,
- USB_STATE_ADDRESS);
- 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: 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(le16_to_cpu(ctrl->wIndex));
- priv_ep = priv_dev->eps[index];
- /* check if endpoint is stalled or stall is pending */
- cdns3_select_ep(priv_dev, le16_to_cpu(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;
- tmode >>= 8;
- switch (tmode) {
- case USB_TEST_J:
- case USB_TEST_K:
- case USB_TEST_SE0_NAK:
- case USB_TEST_PACKET:
- 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 (!(le16_to_cpu(ctrl->wIndex) & ~USB_DIR_IN))
- return 0;
- index = cdns3_ep_addr_to_index(le16_to_cpu(ctrl->wIndex));
- priv_ep = priv_dev->eps[index];
- cdns3_select_ep(priv_dev, le16_to_cpu(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: 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 (le16_to_cpu(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 = le16_to_cpu(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, 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_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
- * @ep: pointer to endpoint zero object
- * @desc: pointer to usb endpoint descriptor
- *
- * 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
- * @ep: pointer to endpoint zero object
- *
- * 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 ret = 0;
- u8 zlp = 0;
- int i;
- spin_lock_irqsave(&priv_dev->lock, flags);
- trace_cdns3_ep0_queue(priv_dev, request);
- /* cancel the request if controller receive new SETUP packet. */
- if (cdns3_check_new_setup(priv_dev)) {
- spin_unlock_irqrestore(&priv_dev->lock, flags);
- return -ECONNRESET;
- }
- /* send STATUS stage. Should be called only for SET_CONFIGURATION */
- if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE) {
- u32 val;
- cdns3_select_ep(priv_dev, 0x00);
- /*
- * Configure all non-control EPs which are not enabled by class driver
- */
- for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
- priv_ep = priv_dev->eps[i];
- if (priv_ep && priv_ep->flags & EP_CLAIMED &&
- !(priv_ep->flags & EP_ENABLED))
- cdns3_ep_config(priv_ep, 0);
- }
- cdns3_set_hw_configuration(priv_dev);
- cdns3_ep0_complete_setup(priv_dev, 0, 1);
- /* wait until configuration set */
- ret = readl_poll_timeout_atomic(&priv_dev->regs->usb_sts, val,
- val & USB_STS_CFGSTS_MASK, 1, 100);
- if (ret == -ETIMEDOUT)
- dev_warn(priv_dev->dev, "timeout for waiting configuration set\n");
- request->actual = 0;
- priv_dev->status_completion_no_call = true;
- priv_dev->pending_status_request = request;
- usb_gadget_set_state(&priv_dev->gadget, USB_STATE_CONFIGURED);
- 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 ret;
- }
- 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;
- }
- static 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;
- u32 ep_cfg;
- 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));
- }
- ep_cfg = EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size);
- if (!(priv_ep->flags & EP_CONFIGURED))
- writel(ep_cfg, ®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);
- if (!(priv_ep->flags & EP_CONFIGURED))
- writel(ep_cfg, ®s->ep_cfg);
- priv_ep->flags |= EP_CONFIGURED;
- 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
- * @priv_ep: 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);
- }
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