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ep0.c
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ep0.c
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// SPDX-License-Identifier: GPL-2.0
/*
* ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling
*
* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/composite.h>
#include "core.h"
#include "debug.h"
#include "gadget.h"
#include "io.h"
static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
struct dwc3_ep *dep, struct dwc3_request *req);
static void dwc3_ep0_prepare_one_trb(struct dwc3_ep *dep,
dma_addr_t buf_dma, u32 len, u32 type, bool chain)
{
struct dwc3_trb *trb;
struct dwc3 *dwc;
dwc = dep->dwc;
trb = &dwc->ep0_trb[dep->trb_enqueue];
if (chain)
dep->trb_enqueue++;
trb->bpl = lower_32_bits(buf_dma);
trb->bph = upper_32_bits(buf_dma);
trb->size = len;
trb->ctrl = type;
trb->ctrl |= (DWC3_TRB_CTRL_HWO
| DWC3_TRB_CTRL_ISP_IMI);
if (chain)
trb->ctrl |= DWC3_TRB_CTRL_CHN;
else
trb->ctrl |= (DWC3_TRB_CTRL_IOC
| DWC3_TRB_CTRL_LST);
trace_dwc3_prepare_trb(dep, trb);
}
static int dwc3_ep0_start_trans(struct dwc3_ep *dep)
{
struct dwc3_gadget_ep_cmd_params params;
struct dwc3 *dwc;
int ret;
if (dep->flags & DWC3_EP_TRANSFER_STARTED)
return 0;
dwc = dep->dwc;
memset(¶ms, 0, sizeof(params));
params.param0 = upper_32_bits(dwc->ep0_trb_addr);
params.param1 = lower_32_bits(dwc->ep0_trb_addr);
ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, ¶ms);
if (ret < 0)
return ret;
dwc->ep0_next_event = DWC3_EP0_COMPLETE;
return 0;
}
static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
struct dwc3_request *req)
{
struct dwc3 *dwc = dep->dwc;
req->request.actual = 0;
req->request.status = -EINPROGRESS;
req->epnum = dep->number;
list_add_tail(&req->list, &dep->pending_list);
/*
* Gadget driver might not be quick enough to queue a request
* before we get a Transfer Not Ready event on this endpoint.
*
* In that case, we will set DWC3_EP_PENDING_REQUEST. When that
* flag is set, it's telling us that as soon as Gadget queues the
* required request, we should kick the transfer here because the
* IRQ we were waiting for is long gone.
*/
if (dep->flags & DWC3_EP_PENDING_REQUEST) {
unsigned direction;
direction = !!(dep->flags & DWC3_EP0_DIR_IN);
if (dwc->ep0state != EP0_DATA_PHASE) {
dev_WARN(dwc->dev, "Unexpected pending request\n");
return 0;
}
__dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
DWC3_EP0_DIR_IN);
return 0;
}
/*
* In case gadget driver asked us to delay the STATUS phase,
* handle it here.
*/
if (dwc->delayed_status) {
unsigned direction;
direction = !dwc->ep0_expect_in;
dwc->delayed_status = false;
usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
if (dwc->ep0state == EP0_STATUS_PHASE)
__dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
return 0;
}
/*
* Unfortunately we have uncovered a limitation wrt the Data Phase.
*
* Section 9.4 says we can wait for the XferNotReady(DATA) event to
* come before issueing Start Transfer command, but if we do, we will
* miss situations where the host starts another SETUP phase instead of
* the DATA phase. Such cases happen at least on TD.7.6 of the Link
* Layer Compliance Suite.
*
* The problem surfaces due to the fact that in case of back-to-back
* SETUP packets there will be no XferNotReady(DATA) generated and we
* will be stuck waiting for XferNotReady(DATA) forever.
*
* By looking at tables 9-13 and 9-14 of the Databook, we can see that
* it tells us to start Data Phase right away. It also mentions that if
* we receive a SETUP phase instead of the DATA phase, core will issue
* XferComplete for the DATA phase, before actually initiating it in
* the wire, with the TRB's status set to "SETUP_PENDING". Such status
* can only be used to print some debugging logs, as the core expects
* us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
* just so it completes right away, without transferring anything and,
* only then, we can go back to the SETUP phase.
*
* Because of this scenario, SNPS decided to change the programming
* model of control transfers and support on-demand transfers only for
* the STATUS phase. To fix the issue we have now, we will always wait
* for gadget driver to queue the DATA phase's struct usb_request, then
* start it right away.
*
* If we're actually in a 2-stage transfer, we will wait for
* XferNotReady(STATUS).
*/
if (dwc->three_stage_setup) {
unsigned direction;
direction = dwc->ep0_expect_in;
dwc->ep0state = EP0_DATA_PHASE;
__dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
dep->flags &= ~DWC3_EP0_DIR_IN;
}
return 0;
}
int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
gfp_t gfp_flags)
{
struct dwc3_request *req = to_dwc3_request(request);
struct dwc3_ep *dep = to_dwc3_ep(ep);
struct dwc3 *dwc = dep->dwc;
unsigned long flags;
int ret;
spin_lock_irqsave(&dwc->lock, flags);
if (!dep->endpoint.desc) {
dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
dep->name);
ret = -ESHUTDOWN;
goto out;
}
/* we share one TRB for ep0/1 */
if (!list_empty(&dep->pending_list)) {
ret = -EBUSY;
goto out;
}
ret = __dwc3_gadget_ep0_queue(dep, req);
out:
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;
}
static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
{
struct dwc3_ep *dep;
/* reinitialize physical ep1 */
dep = dwc->eps[1];
dep->flags = DWC3_EP_ENABLED;
/* stall is always issued on EP0 */
dep = dwc->eps[0];
__dwc3_gadget_ep_set_halt(dep, 1, false);
dep->flags = DWC3_EP_ENABLED;
dwc->delayed_status = false;
if (!list_empty(&dep->pending_list)) {
struct dwc3_request *req;
req = next_request(&dep->pending_list);
dwc3_gadget_giveback(dep, req, -ECONNRESET);
}
dwc->ep0state = EP0_SETUP_PHASE;
dwc3_ep0_out_start(dwc);
}
int __dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
{
struct dwc3_ep *dep = to_dwc3_ep(ep);
struct dwc3 *dwc = dep->dwc;
dwc3_ep0_stall_and_restart(dwc);
return 0;
}
int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
{
struct dwc3_ep *dep = to_dwc3_ep(ep);
struct dwc3 *dwc = dep->dwc;
unsigned long flags;
int ret;
spin_lock_irqsave(&dwc->lock, flags);
ret = __dwc3_gadget_ep0_set_halt(ep, value);
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;
}
void dwc3_ep0_out_start(struct dwc3 *dwc)
{
struct dwc3_ep *dep;
int ret;
complete(&dwc->ep0_in_setup);
dep = dwc->eps[0];
dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8,
DWC3_TRBCTL_CONTROL_SETUP, false);
ret = dwc3_ep0_start_trans(dep);
WARN_ON(ret < 0);
}
static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
{
struct dwc3_ep *dep;
u32 windex = le16_to_cpu(wIndex_le);
u32 epnum;
epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
epnum |= 1;
dep = dwc->eps[epnum];
if (dep->flags & DWC3_EP_ENABLED)
return dep;
return NULL;
}
static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
{
}
/*
* ch 9.4.5
*/
static int dwc3_ep0_handle_status(struct dwc3 *dwc,
struct usb_ctrlrequest *ctrl)
{
struct dwc3_ep *dep;
u32 recip;
u32 value;
u32 reg;
u16 usb_status = 0;
__le16 *response_pkt;
/* We don't support PTM_STATUS */
value = le16_to_cpu(ctrl->wValue);
if (value != 0)
return -EINVAL;
recip = ctrl->bRequestType & USB_RECIP_MASK;
switch (recip) {
case USB_RECIP_DEVICE:
/*
* LTM will be set once we know how to set this in HW.
*/
usb_status |= dwc->gadget.is_selfpowered;
if ((dwc->speed == DWC3_DSTS_SUPERSPEED) ||
(dwc->speed == DWC3_DSTS_SUPERSPEED_PLUS)) {
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (reg & DWC3_DCTL_INITU1ENA)
usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
if (reg & DWC3_DCTL_INITU2ENA)
usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
}
break;
case USB_RECIP_INTERFACE:
/*
* Function Remote Wake Capable D0
* Function Remote Wakeup D1
*/
break;
case USB_RECIP_ENDPOINT:
dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
if (!dep)
return -EINVAL;
if (dep->flags & DWC3_EP_STALL)
usb_status = 1 << USB_ENDPOINT_HALT;
break;
default:
return -EINVAL;
}
response_pkt = (__le16 *) dwc->setup_buf;
*response_pkt = cpu_to_le16(usb_status);
dep = dwc->eps[0];
dwc->ep0_usb_req.dep = dep;
dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
dwc->ep0_usb_req.request.buf = dwc->setup_buf;
dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
}
static int dwc3_ep0_handle_u1(struct dwc3 *dwc, enum usb_device_state state,
int set)
{
u32 reg;
if (state != USB_STATE_CONFIGURED)
return -EINVAL;
if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
(dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
return -EINVAL;
if (set && dwc->dis_u1_entry_quirk)
return -EINVAL;
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (set)
reg |= DWC3_DCTL_INITU1ENA;
else
reg &= ~DWC3_DCTL_INITU1ENA;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
return 0;
}
static int dwc3_ep0_handle_u2(struct dwc3 *dwc, enum usb_device_state state,
int set)
{
u32 reg;
if (state != USB_STATE_CONFIGURED)
return -EINVAL;
if ((dwc->speed != DWC3_DSTS_SUPERSPEED) &&
(dwc->speed != DWC3_DSTS_SUPERSPEED_PLUS))
return -EINVAL;
if (set && dwc->dis_u2_entry_quirk)
return -EINVAL;
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (set)
reg |= DWC3_DCTL_INITU2ENA;
else
reg &= ~DWC3_DCTL_INITU2ENA;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
return 0;
}
static int dwc3_ep0_handle_test(struct dwc3 *dwc, enum usb_device_state state,
u32 wIndex, int set)
{
if ((wIndex & 0xff) != 0)
return -EINVAL;
if (!set)
return -EINVAL;
switch (wIndex >> 8) {
case TEST_J:
case TEST_K:
case TEST_SE0_NAK:
case TEST_PACKET:
case TEST_FORCE_EN:
dwc->test_mode_nr = wIndex >> 8;
dwc->test_mode = true;
break;
default:
return -EINVAL;
}
return 0;
}
static int dwc3_ep0_handle_device(struct dwc3 *dwc,
struct usb_ctrlrequest *ctrl, int set)
{
enum usb_device_state state;
u32 wValue;
u32 wIndex;
int ret = 0;
wValue = le16_to_cpu(ctrl->wValue);
wIndex = le16_to_cpu(ctrl->wIndex);
state = dwc->gadget.state;
switch (wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
break;
/*
* 9.4.1 says only only for SS, in AddressState only for
* default control pipe
*/
case USB_DEVICE_U1_ENABLE:
ret = dwc3_ep0_handle_u1(dwc, state, set);
break;
case USB_DEVICE_U2_ENABLE:
ret = dwc3_ep0_handle_u2(dwc, state, set);
break;
case USB_DEVICE_LTM_ENABLE:
ret = -EINVAL;
break;
case USB_DEVICE_TEST_MODE:
ret = dwc3_ep0_handle_test(dwc, state, wIndex, set);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
struct usb_ctrlrequest *ctrl, int set)
{
u32 wValue;
int ret = 0;
wValue = le16_to_cpu(ctrl->wValue);
switch (wValue) {
case USB_INTRF_FUNC_SUSPEND:
/*
* REVISIT: Ideally we would enable some low power mode here,
* however it's unclear what we should be doing here.
*
* For now, we're not doing anything, just making sure we return
* 0 so USB Command Verifier tests pass without any errors.
*/
break;
default:
ret = -EINVAL;
}
return ret;
}
static int dwc3_ep0_handle_endpoint(struct dwc3 *dwc,
struct usb_ctrlrequest *ctrl, int set)
{
struct dwc3_ep *dep;
u32 wValue;
int ret;
wValue = le16_to_cpu(ctrl->wValue);
switch (wValue) {
case USB_ENDPOINT_HALT:
dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
if (!dep)
return -EINVAL;
if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
break;
ret = __dwc3_gadget_ep_set_halt(dep, set, true);
if (ret)
return -EINVAL;
/* ClearFeature(Halt) may need delayed status */
if (!set && (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
return USB_GADGET_DELAYED_STATUS;
break;
default:
return -EINVAL;
}
return 0;
}
static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
struct usb_ctrlrequest *ctrl, int set)
{
u32 recip;
int ret;
recip = ctrl->bRequestType & USB_RECIP_MASK;
switch (recip) {
case USB_RECIP_DEVICE:
ret = dwc3_ep0_handle_device(dwc, ctrl, set);
break;
case USB_RECIP_INTERFACE:
ret = dwc3_ep0_handle_intf(dwc, ctrl, set);
break;
case USB_RECIP_ENDPOINT:
ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
{
enum usb_device_state state = dwc->gadget.state;
u32 addr;
u32 reg;
addr = le16_to_cpu(ctrl->wValue);
if (addr > 127) {
dev_err(dwc->dev, "invalid device address %d\n", addr);
return -EINVAL;
}
if (state == USB_STATE_CONFIGURED) {
dev_err(dwc->dev, "can't SetAddress() from Configured State\n");
return -EINVAL;
}
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
reg &= ~(DWC3_DCFG_DEVADDR_MASK);
reg |= DWC3_DCFG_DEVADDR(addr);
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
if (addr)
usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
else
usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
return 0;
}
static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
{
int ret;
spin_unlock(&dwc->lock);
ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
spin_lock(&dwc->lock);
return ret;
}
static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
{
enum usb_device_state state = dwc->gadget.state;
u32 cfg;
int ret;
u32 reg;
cfg = le16_to_cpu(ctrl->wValue);
switch (state) {
case USB_STATE_DEFAULT:
return -EINVAL;
case USB_STATE_ADDRESS:
ret = dwc3_ep0_delegate_req(dwc, ctrl);
/* if the cfg matches and the cfg is non zero */
if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
/*
* only change state if set_config has already
* been processed. If gadget driver returns
* USB_GADGET_DELAYED_STATUS, we will wait
* to change the state on the next usb_ep_queue()
*/
if (ret == 0)
usb_gadget_set_state(&dwc->gadget,
USB_STATE_CONFIGURED);
/*
* Enable transition to U1/U2 state when
* nothing is pending from application.
*/
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (!dwc->dis_u1_entry_quirk)
reg |= DWC3_DCTL_ACCEPTU1ENA;
if (!dwc->dis_u2_entry_quirk)
reg |= DWC3_DCTL_ACCEPTU2ENA;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
}
break;
case USB_STATE_CONFIGURED:
ret = dwc3_ep0_delegate_req(dwc, ctrl);
if (!cfg && !ret)
usb_gadget_set_state(&dwc->gadget,
USB_STATE_ADDRESS);
break;
default:
ret = -EINVAL;
}
return ret;
}
static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
{
struct dwc3_ep *dep = to_dwc3_ep(ep);
struct dwc3 *dwc = dep->dwc;
u32 param = 0;
u32 reg;
struct timing {
u8 u1sel;
u8 u1pel;
__le16 u2sel;
__le16 u2pel;
} __packed timing;
int ret;
memcpy(&timing, req->buf, sizeof(timing));
dwc->u1sel = timing.u1sel;
dwc->u1pel = timing.u1pel;
dwc->u2sel = le16_to_cpu(timing.u2sel);
dwc->u2pel = le16_to_cpu(timing.u2pel);
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (reg & DWC3_DCTL_INITU2ENA)
param = dwc->u2pel;
if (reg & DWC3_DCTL_INITU1ENA)
param = dwc->u1pel;
/*
* According to Synopsys Databook, if parameter is
* greater than 125, a value of zero should be
* programmed in the register.
*/
if (param > 125)
param = 0;
/* now that we have the time, issue DGCMD Set Sel */
ret = dwc3_send_gadget_generic_command(dwc,
DWC3_DGCMD_SET_PERIODIC_PAR, param);
WARN_ON(ret < 0);
}
static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
{
struct dwc3_ep *dep;
enum usb_device_state state = dwc->gadget.state;
u16 wLength;
if (state == USB_STATE_DEFAULT)
return -EINVAL;
wLength = le16_to_cpu(ctrl->wLength);
if (wLength != 6) {
dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
wLength);
return -EINVAL;
}
/*
* To handle Set SEL we need to receive 6 bytes from Host. So let's
* queue a usb_request for 6 bytes.
*
* Remember, though, this controller can't handle non-wMaxPacketSize
* aligned transfers on the OUT direction, so we queue a request for
* wMaxPacketSize instead.
*/
dep = dwc->eps[0];
dwc->ep0_usb_req.dep = dep;
dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
dwc->ep0_usb_req.request.buf = dwc->setup_buf;
dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
}
static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
{
u16 wLength;
u16 wValue;
u16 wIndex;
wValue = le16_to_cpu(ctrl->wValue);
wLength = le16_to_cpu(ctrl->wLength);
wIndex = le16_to_cpu(ctrl->wIndex);
if (wIndex || wLength)
return -EINVAL;
dwc->gadget.isoch_delay = wValue;
return 0;
}
static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
{
int ret;
switch (ctrl->bRequest) {
case USB_REQ_GET_STATUS:
ret = dwc3_ep0_handle_status(dwc, ctrl);
break;
case USB_REQ_CLEAR_FEATURE:
ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
break;
case USB_REQ_SET_FEATURE:
ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
break;
case USB_REQ_SET_ADDRESS:
ret = dwc3_ep0_set_address(dwc, ctrl);
break;
case USB_REQ_SET_CONFIGURATION:
ret = dwc3_ep0_set_config(dwc, ctrl);
break;
case USB_REQ_SET_SEL:
ret = dwc3_ep0_set_sel(dwc, ctrl);
break;
case USB_REQ_SET_ISOCH_DELAY:
ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
break;
default:
ret = dwc3_ep0_delegate_req(dwc, ctrl);
break;
}
return ret;
}
static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
const struct dwc3_event_depevt *event)
{
struct usb_ctrlrequest *ctrl = (void *) dwc->ep0_trb;
int ret = -EINVAL;
u32 len;
if (!dwc->gadget_driver)
goto out;
trace_dwc3_ctrl_req(ctrl);
len = le16_to_cpu(ctrl->wLength);
if (!len) {
dwc->three_stage_setup = false;
dwc->ep0_expect_in = false;
dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
} else {
dwc->three_stage_setup = true;
dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
}
if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
ret = dwc3_ep0_std_request(dwc, ctrl);
else
ret = dwc3_ep0_delegate_req(dwc, ctrl);
if (ret == USB_GADGET_DELAYED_STATUS)
dwc->delayed_status = true;
out:
if (ret < 0)
dwc3_ep0_stall_and_restart(dwc);
}
static void dwc3_ep0_complete_data(struct dwc3 *dwc,
const struct dwc3_event_depevt *event)
{
struct dwc3_request *r;
struct usb_request *ur;
struct dwc3_trb *trb;
struct dwc3_ep *ep0;
u32 transferred = 0;
u32 status;
u32 length;
u8 epnum;
epnum = event->endpoint_number;
ep0 = dwc->eps[0];
dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
trb = dwc->ep0_trb;
trace_dwc3_complete_trb(ep0, trb);
r = next_request(&ep0->pending_list);
if (!r)
return;
status = DWC3_TRB_SIZE_TRBSTS(trb->size);
if (status == DWC3_TRBSTS_SETUP_PENDING) {
dwc->setup_packet_pending = true;
if (r)
dwc3_gadget_giveback(ep0, r, -ECONNRESET);
return;
}
ur = &r->request;
length = trb->size & DWC3_TRB_SIZE_MASK;
transferred = ur->length - length;
ur->actual += transferred;
if ((IS_ALIGNED(ur->length, ep0->endpoint.maxpacket) &&
ur->length && ur->zero) || dwc->ep0_bounced) {
trb++;
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
trace_dwc3_complete_trb(ep0, trb);
if (r->direction)
dwc->eps[1]->trb_enqueue = 0;
else
dwc->eps[0]->trb_enqueue = 0;
dwc->ep0_bounced = false;
}
if ((epnum & 1) && ur->actual < ur->length)
dwc3_ep0_stall_and_restart(dwc);
else
dwc3_gadget_giveback(ep0, r, 0);
}
static void dwc3_ep0_complete_status(struct dwc3 *dwc,
const struct dwc3_event_depevt *event)
{
struct dwc3_request *r;
struct dwc3_ep *dep;
struct dwc3_trb *trb;
u32 status;
dep = dwc->eps[0];
trb = dwc->ep0_trb;
trace_dwc3_complete_trb(dep, trb);
if (!list_empty(&dep->pending_list)) {
r = next_request(&dep->pending_list);
dwc3_gadget_giveback(dep, r, 0);
}
if (dwc->test_mode) {
int ret;
ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
if (ret < 0) {
dev_err(dwc->dev, "invalid test #%d\n",
dwc->test_mode_nr);
dwc3_ep0_stall_and_restart(dwc);
return;
}
}
status = DWC3_TRB_SIZE_TRBSTS(trb->size);
if (status == DWC3_TRBSTS_SETUP_PENDING)
dwc->setup_packet_pending = true;
dwc->ep0state = EP0_SETUP_PHASE;
dwc3_ep0_out_start(dwc);
}
static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
const struct dwc3_event_depevt *event)
{
struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
dep->resource_index = 0;
dwc->setup_packet_pending = false;
switch (dwc->ep0state) {
case EP0_SETUP_PHASE:
dwc3_ep0_inspect_setup(dwc, event);
break;
case EP0_DATA_PHASE:
dwc3_ep0_complete_data(dwc, event);
break;
case EP0_STATUS_PHASE:
dwc3_ep0_complete_status(dwc, event);
break;
default:
WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
}
}
static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
struct dwc3_ep *dep, struct dwc3_request *req)
{
unsigned int trb_length = 0;
int ret;
req->direction = !!dep->number;
if (req->request.length == 0) {
if (!req->direction)
trb_length = dep->endpoint.maxpacket;
dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr, trb_length,
DWC3_TRBCTL_CONTROL_DATA, false);
ret = dwc3_ep0_start_trans(dep);
} else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
&& (dep->number == 0)) {
u32 maxpacket;
u32 rem;
ret = usb_gadget_map_request_by_dev(dwc->sysdev,
&req->request, dep->number);
if (ret)
return;
maxpacket = dep->endpoint.maxpacket;
rem = req->request.length % maxpacket;
dwc->ep0_bounced = true;
/* prepare normal TRB */
dwc3_ep0_prepare_one_trb(dep, req->request.dma,
req->request.length,
DWC3_TRBCTL_CONTROL_DATA,
true);
req->trb = &dwc->ep0_trb[dep->trb_enqueue - 1];
/* Now prepare one extra TRB to align transfer size */
dwc3_ep0_prepare_one_trb(dep, dwc->bounce_addr,
maxpacket - rem,
DWC3_TRBCTL_CONTROL_DATA,
false);
ret = dwc3_ep0_start_trans(dep);
} else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) &&
req->request.length && req->request.zero) {
ret = usb_gadget_map_request_by_dev(dwc->sysdev,
&req->request, dep->number);
if (ret)
return;
/* prepare normal TRB */
dwc3_ep0_prepare_one_trb(dep, req->request.dma,
req->request.length,