// 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);
}
Codebase Browser
linux