2 * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions, and the following disclaimer,
14 * without modification.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The names of the above-listed copyright holders may not be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
22 * ALTERNATIVELY, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") version 2, as published by the Free
24 * Software Foundation.
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/kernel.h>
40 #include <linux/slab.h>
41 #include <linux/spinlock.h>
42 #include <linux/platform_device.h>
43 #include <linux/pm_runtime.h>
44 #include <linux/interrupt.h>
46 #include <linux/list.h>
47 #include <linux/dma-mapping.h>
49 #include <linux/usb/ch9.h>
50 #include <linux/usb/gadget.h>
51 #include <linux/usb/composite.h>
57 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
58 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
59 struct dwc3_ep *dep, struct dwc3_request *req);
61 static const char *dwc3_ep0_state_string(enum dwc3_ep0_state state)
70 case EP0_STATUS_PHASE:
71 return "Status Phase";
77 static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
80 struct dwc3_gadget_ep_cmd_params params;
86 dep = dwc->eps[epnum];
87 if (dep->flags & DWC3_EP_BUSY) {
88 dev_vdbg(dwc->dev, "%s: still busy\n", dep->name);
94 trb->bpl = lower_32_bits(buf_dma);
95 trb->bph = upper_32_bits(buf_dma);
99 trb->ctrl |= (DWC3_TRB_CTRL_HWO
102 | DWC3_TRB_CTRL_ISP_IMI);
104 memset(¶ms, 0, sizeof(params));
105 params.param0 = upper_32_bits(dwc->ep0_trb_addr);
106 params.param1 = lower_32_bits(dwc->ep0_trb_addr);
108 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
109 DWC3_DEPCMD_STARTTRANSFER, ¶ms);
111 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
115 dep->flags |= DWC3_EP_BUSY;
116 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
119 dwc->ep0_next_event = DWC3_EP0_COMPLETE;
124 static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
125 struct dwc3_request *req)
127 struct dwc3 *dwc = dep->dwc;
129 req->request.actual = 0;
130 req->request.status = -EINPROGRESS;
131 req->epnum = dep->number;
133 list_add_tail(&req->list, &dep->request_list);
136 * Gadget driver might not be quick enough to queue a request
137 * before we get a Transfer Not Ready event on this endpoint.
139 * In that case, we will set DWC3_EP_PENDING_REQUEST. When that
140 * flag is set, it's telling us that as soon as Gadget queues the
141 * required request, we should kick the transfer here because the
142 * IRQ we were waiting for is long gone.
144 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
147 direction = !!(dep->flags & DWC3_EP0_DIR_IN);
149 if (dwc->ep0state != EP0_DATA_PHASE) {
150 dev_WARN(dwc->dev, "Unexpected pending request\n");
154 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
156 dep->flags &= ~(DWC3_EP_PENDING_REQUEST |
163 * In case gadget driver asked us to delay the STATUS phase,
166 if (dwc->delayed_status) {
169 direction = !dwc->ep0_expect_in;
170 dwc->delayed_status = false;
172 if (dwc->ep0state == EP0_STATUS_PHASE)
173 __dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
175 dev_dbg(dwc->dev, "too early for delayed status\n");
181 * Unfortunately we have uncovered a limitation wrt the Data Phase.
183 * Section 9.4 says we can wait for the XferNotReady(DATA) event to
184 * come before issueing Start Transfer command, but if we do, we will
185 * miss situations where the host starts another SETUP phase instead of
186 * the DATA phase. Such cases happen at least on TD.7.6 of the Link
187 * Layer Compliance Suite.
189 * The problem surfaces due to the fact that in case of back-to-back
190 * SETUP packets there will be no XferNotReady(DATA) generated and we
191 * will be stuck waiting for XferNotReady(DATA) forever.
193 * By looking at tables 9-13 and 9-14 of the Databook, we can see that
194 * it tells us to start Data Phase right away. It also mentions that if
195 * we receive a SETUP phase instead of the DATA phase, core will issue
196 * XferComplete for the DATA phase, before actually initiating it in
197 * the wire, with the TRB's status set to "SETUP_PENDING". Such status
198 * can only be used to print some debugging logs, as the core expects
199 * us to go through to the STATUS phase and start a CONTROL_STATUS TRB,
200 * just so it completes right away, without transferring anything and,
201 * only then, we can go back to the SETUP phase.
203 * Because of this scenario, SNPS decided to change the programming
204 * model of control transfers and support on-demand transfers only for
205 * the STATUS phase. To fix the issue we have now, we will always wait
206 * for gadget driver to queue the DATA phase's struct usb_request, then
207 * start it right away.
209 * If we're actually in a 2-stage transfer, we will wait for
210 * XferNotReady(STATUS).
212 if (dwc->three_stage_setup) {
215 direction = dwc->ep0_expect_in;
216 dwc->ep0state = EP0_DATA_PHASE;
218 __dwc3_ep0_do_control_data(dwc, dwc->eps[direction], req);
220 dep->flags &= ~DWC3_EP0_DIR_IN;
226 int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
229 struct dwc3_request *req = to_dwc3_request(request);
230 struct dwc3_ep *dep = to_dwc3_ep(ep);
231 struct dwc3 *dwc = dep->dwc;
237 spin_lock_irqsave(&dwc->lock, flags);
238 if (!dep->endpoint.desc) {
239 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
245 /* we share one TRB for ep0/1 */
246 if (!list_empty(&dep->request_list)) {
251 dev_vdbg(dwc->dev, "queueing request %p to %s length %d, state '%s'\n",
252 request, dep->name, request->length,
253 dwc3_ep0_state_string(dwc->ep0state));
255 ret = __dwc3_gadget_ep0_queue(dep, req);
258 spin_unlock_irqrestore(&dwc->lock, flags);
263 static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
267 /* reinitialize physical ep1 */
269 dep->flags = DWC3_EP_ENABLED;
271 /* stall is always issued on EP0 */
273 __dwc3_gadget_ep_set_halt(dep, 1, false);
274 dep->flags = DWC3_EP_ENABLED;
275 dwc->delayed_status = false;
277 if (!list_empty(&dep->request_list)) {
278 struct dwc3_request *req;
280 req = next_request(&dep->request_list);
281 dwc3_gadget_giveback(dep, req, -ECONNRESET);
284 dwc->ep0state = EP0_SETUP_PHASE;
285 dwc3_ep0_out_start(dwc);
288 int dwc3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
290 struct dwc3_ep *dep = to_dwc3_ep(ep);
291 struct dwc3 *dwc = dep->dwc;
293 dwc3_ep0_stall_and_restart(dwc);
298 void dwc3_ep0_out_start(struct dwc3 *dwc)
302 ret = dwc3_ep0_start_trans(dwc, 0, dwc->ctrl_req_addr, 8,
303 DWC3_TRBCTL_CONTROL_SETUP);
307 static struct dwc3_ep *dwc3_wIndex_to_dep(struct dwc3 *dwc, __le16 wIndex_le)
310 u32 windex = le16_to_cpu(wIndex_le);
313 epnum = (windex & USB_ENDPOINT_NUMBER_MASK) << 1;
314 if ((windex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
317 dep = dwc->eps[epnum];
318 if (dep->flags & DWC3_EP_ENABLED)
324 static void dwc3_ep0_status_cmpl(struct usb_ep *ep, struct usb_request *req)
330 static int dwc3_ep0_handle_status(struct dwc3 *dwc,
331 struct usb_ctrlrequest *ctrl)
337 __le16 *response_pkt;
339 recip = ctrl->bRequestType & USB_RECIP_MASK;
341 case USB_RECIP_DEVICE:
343 * LTM will be set once we know how to set this in HW.
345 usb_status |= dwc->is_selfpowered << USB_DEVICE_SELF_POWERED;
347 if (dwc->speed == DWC3_DSTS_SUPERSPEED) {
348 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
349 if (reg & DWC3_DCTL_INITU1ENA)
350 usb_status |= 1 << USB_DEV_STAT_U1_ENABLED;
351 if (reg & DWC3_DCTL_INITU2ENA)
352 usb_status |= 1 << USB_DEV_STAT_U2_ENABLED;
357 case USB_RECIP_INTERFACE:
359 * Function Remote Wake Capable D0
360 * Function Remote Wakeup D1
364 case USB_RECIP_ENDPOINT:
365 dep = dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
369 if (dep->flags & DWC3_EP_STALL)
370 usb_status = 1 << USB_ENDPOINT_HALT;
376 response_pkt = (__le16 *) dwc->setup_buf;
377 *response_pkt = cpu_to_le16(usb_status);
380 dwc->ep0_usb_req.dep = dep;
381 dwc->ep0_usb_req.request.length = sizeof(*response_pkt);
382 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
383 dwc->ep0_usb_req.request.complete = dwc3_ep0_status_cmpl;
385 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
388 static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
389 struct usb_ctrlrequest *ctrl, int set)
397 enum usb_device_state state;
399 wValue = le16_to_cpu(ctrl->wValue);
400 wIndex = le16_to_cpu(ctrl->wIndex);
401 recip = ctrl->bRequestType & USB_RECIP_MASK;
402 state = dwc->gadget.state;
405 case USB_RECIP_DEVICE:
408 case USB_DEVICE_REMOTE_WAKEUP:
411 * 9.4.1 says only only for SS, in AddressState only for
412 * default control pipe
414 case USB_DEVICE_U1_ENABLE:
415 if (state != USB_STATE_CONFIGURED)
417 if (dwc->speed != DWC3_DSTS_SUPERSPEED)
420 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
422 reg |= DWC3_DCTL_INITU1ENA;
424 reg &= ~DWC3_DCTL_INITU1ENA;
425 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
428 case USB_DEVICE_U2_ENABLE:
429 if (state != USB_STATE_CONFIGURED)
431 if (dwc->speed != DWC3_DSTS_SUPERSPEED)
434 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
436 reg |= DWC3_DCTL_INITU2ENA;
438 reg &= ~DWC3_DCTL_INITU2ENA;
439 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
442 case USB_DEVICE_LTM_ENABLE:
446 case USB_DEVICE_TEST_MODE:
447 if ((wIndex & 0xff) != 0)
452 dwc->test_mode_nr = wIndex >> 8;
453 dwc->test_mode = true;
460 case USB_RECIP_INTERFACE:
462 case USB_INTRF_FUNC_SUSPEND:
463 if (wIndex & USB_INTRF_FUNC_SUSPEND_LP)
464 /* XXX enable Low power suspend */
466 if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
467 /* XXX enable remote wakeup */
475 case USB_RECIP_ENDPOINT:
477 case USB_ENDPOINT_HALT:
478 dep = dwc3_wIndex_to_dep(dwc, wIndex);
481 if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
483 ret = __dwc3_gadget_ep_set_halt(dep, set, true);
499 static int dwc3_ep0_set_address(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
501 enum usb_device_state state = dwc->gadget.state;
505 addr = le16_to_cpu(ctrl->wValue);
507 dev_dbg(dwc->dev, "invalid device address %d\n", addr);
511 if (state == USB_STATE_CONFIGURED) {
512 dev_dbg(dwc->dev, "trying to set address when configured\n");
516 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
517 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
518 reg |= DWC3_DCFG_DEVADDR(addr);
519 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
522 usb_gadget_set_state(&dwc->gadget, USB_STATE_ADDRESS);
524 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
529 static int dwc3_ep0_delegate_req(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
533 spin_unlock(&dwc->lock);
534 ret = dwc->gadget_driver->setup(&dwc->gadget, ctrl);
535 spin_lock(&dwc->lock);
539 static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
541 enum usb_device_state state = dwc->gadget.state;
546 dwc->start_config_issued = false;
547 cfg = le16_to_cpu(ctrl->wValue);
550 case USB_STATE_DEFAULT:
554 case USB_STATE_ADDRESS:
555 ret = dwc3_ep0_delegate_req(dwc, ctrl);
556 /* if the cfg matches and the cfg is non zero */
557 if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
558 usb_gadget_set_state(&dwc->gadget,
559 USB_STATE_CONFIGURED);
562 * Enable transition to U1/U2 state when
563 * nothing is pending from application.
565 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
566 reg |= (DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA);
567 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
569 dwc->resize_fifos = true;
570 dev_dbg(dwc->dev, "resize fifos flag SET\n");
574 case USB_STATE_CONFIGURED:
575 ret = dwc3_ep0_delegate_req(dwc, ctrl);
577 usb_gadget_set_state(&dwc->gadget,
586 static void dwc3_ep0_set_sel_cmpl(struct usb_ep *ep, struct usb_request *req)
588 struct dwc3_ep *dep = to_dwc3_ep(ep);
589 struct dwc3 *dwc = dep->dwc;
603 memcpy(&timing, req->buf, sizeof(timing));
605 dwc->u1sel = timing.u1sel;
606 dwc->u1pel = timing.u1pel;
607 dwc->u2sel = le16_to_cpu(timing.u2sel);
608 dwc->u2pel = le16_to_cpu(timing.u2pel);
610 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
611 if (reg & DWC3_DCTL_INITU2ENA)
613 if (reg & DWC3_DCTL_INITU1ENA)
617 * According to Synopsys Databook, if parameter is
618 * greater than 125, a value of zero should be
619 * programmed in the register.
624 /* now that we have the time, issue DGCMD Set Sel */
625 ret = dwc3_send_gadget_generic_command(dwc,
626 DWC3_DGCMD_SET_PERIODIC_PAR, param);
630 static int dwc3_ep0_set_sel(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
633 enum usb_device_state state = dwc->gadget.state;
637 if (state == USB_STATE_DEFAULT)
640 wValue = le16_to_cpu(ctrl->wValue);
641 wLength = le16_to_cpu(ctrl->wLength);
644 dev_err(dwc->dev, "Set SEL should be 6 bytes, got %d\n",
650 * To handle Set SEL we need to receive 6 bytes from Host. So let's
651 * queue a usb_request for 6 bytes.
653 * Remember, though, this controller can't handle non-wMaxPacketSize
654 * aligned transfers on the OUT direction, so we queue a request for
655 * wMaxPacketSize instead.
658 dwc->ep0_usb_req.dep = dep;
659 dwc->ep0_usb_req.request.length = dep->endpoint.maxpacket;
660 dwc->ep0_usb_req.request.buf = dwc->setup_buf;
661 dwc->ep0_usb_req.request.complete = dwc3_ep0_set_sel_cmpl;
663 return __dwc3_gadget_ep0_queue(dep, &dwc->ep0_usb_req);
666 static int dwc3_ep0_set_isoch_delay(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
672 wValue = le16_to_cpu(ctrl->wValue);
673 wLength = le16_to_cpu(ctrl->wLength);
674 wIndex = le16_to_cpu(ctrl->wIndex);
676 if (wIndex || wLength)
680 * REVISIT It's unclear from Databook what to do with this
681 * value. For now, just cache it.
683 dwc->isoch_delay = wValue;
688 static int dwc3_ep0_std_request(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
692 switch (ctrl->bRequest) {
693 case USB_REQ_GET_STATUS:
694 dev_vdbg(dwc->dev, "USB_REQ_GET_STATUS\n");
695 ret = dwc3_ep0_handle_status(dwc, ctrl);
697 case USB_REQ_CLEAR_FEATURE:
698 dev_vdbg(dwc->dev, "USB_REQ_CLEAR_FEATURE\n");
699 ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
701 case USB_REQ_SET_FEATURE:
702 dev_vdbg(dwc->dev, "USB_REQ_SET_FEATURE\n");
703 ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
705 case USB_REQ_SET_ADDRESS:
706 dev_vdbg(dwc->dev, "USB_REQ_SET_ADDRESS\n");
707 ret = dwc3_ep0_set_address(dwc, ctrl);
709 case USB_REQ_SET_CONFIGURATION:
710 dev_vdbg(dwc->dev, "USB_REQ_SET_CONFIGURATION\n");
711 ret = dwc3_ep0_set_config(dwc, ctrl);
713 case USB_REQ_SET_SEL:
714 dev_vdbg(dwc->dev, "USB_REQ_SET_SEL\n");
715 ret = dwc3_ep0_set_sel(dwc, ctrl);
717 case USB_REQ_SET_ISOCH_DELAY:
718 dev_vdbg(dwc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
719 ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
722 dev_vdbg(dwc->dev, "Forwarding to gadget driver\n");
723 ret = dwc3_ep0_delegate_req(dwc, ctrl);
730 static void dwc3_ep0_inspect_setup(struct dwc3 *dwc,
731 const struct dwc3_event_depevt *event)
733 struct usb_ctrlrequest *ctrl = dwc->ctrl_req;
737 if (!dwc->gadget_driver)
740 len = le16_to_cpu(ctrl->wLength);
742 dwc->three_stage_setup = false;
743 dwc->ep0_expect_in = false;
744 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
746 dwc->three_stage_setup = true;
747 dwc->ep0_expect_in = !!(ctrl->bRequestType & USB_DIR_IN);
748 dwc->ep0_next_event = DWC3_EP0_NRDY_DATA;
751 if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
752 ret = dwc3_ep0_std_request(dwc, ctrl);
754 ret = dwc3_ep0_delegate_req(dwc, ctrl);
756 if (ret == USB_GADGET_DELAYED_STATUS)
757 dwc->delayed_status = true;
761 dwc3_ep0_stall_and_restart(dwc);
764 static void dwc3_ep0_complete_data(struct dwc3 *dwc,
765 const struct dwc3_event_depevt *event)
767 struct dwc3_request *r = NULL;
768 struct usb_request *ur;
769 struct dwc3_trb *trb;
776 epnum = event->endpoint_number;
779 dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;
781 r = next_request(&ep0->request_list);
786 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
787 if (status == DWC3_TRBSTS_SETUP_PENDING) {
788 dev_dbg(dwc->dev, "Setup Pending received\n");
791 dwc3_gadget_giveback(ep0, r, -ECONNRESET);
796 length = trb->size & DWC3_TRB_SIZE_MASK;
798 if (dwc->ep0_bounced) {
799 unsigned transfer_size = ur->length;
800 unsigned maxp = ep0->endpoint.maxpacket;
802 transfer_size += (maxp - (transfer_size % maxp));
803 transferred = min_t(u32, ur->length,
804 transfer_size - length);
805 memcpy(ur->buf, dwc->ep0_bounce, transferred);
807 transferred = ur->length - length;
810 ur->actual += transferred;
812 if ((epnum & 1) && ur->actual < ur->length) {
813 /* for some reason we did not get everything out */
815 dwc3_ep0_stall_and_restart(dwc);
818 * handle the case where we have to send a zero packet. This
819 * seems to be case when req.length > maxpacket. Could it be?
822 dwc3_gadget_giveback(ep0, r, 0);
826 static void dwc3_ep0_complete_status(struct dwc3 *dwc,
827 const struct dwc3_event_depevt *event)
829 struct dwc3_request *r;
831 struct dwc3_trb *trb;
837 if (!list_empty(&dep->request_list)) {
838 r = next_request(&dep->request_list);
840 dwc3_gadget_giveback(dep, r, 0);
843 if (dwc->test_mode) {
846 ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
848 dev_dbg(dwc->dev, "Invalid Test #%d\n",
850 dwc3_ep0_stall_and_restart(dwc);
855 status = DWC3_TRB_SIZE_TRBSTS(trb->size);
856 if (status == DWC3_TRBSTS_SETUP_PENDING)
857 dev_dbg(dwc->dev, "Setup Pending received\n");
859 dwc->ep0state = EP0_SETUP_PHASE;
860 dwc3_ep0_out_start(dwc);
863 static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
864 const struct dwc3_event_depevt *event)
866 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
868 dep->flags &= ~DWC3_EP_BUSY;
869 dep->resource_index = 0;
870 dwc->setup_packet_pending = false;
872 switch (dwc->ep0state) {
873 case EP0_SETUP_PHASE:
874 dev_vdbg(dwc->dev, "Inspecting Setup Bytes\n");
875 dwc3_ep0_inspect_setup(dwc, event);
879 dev_vdbg(dwc->dev, "Data Phase\n");
880 dwc3_ep0_complete_data(dwc, event);
883 case EP0_STATUS_PHASE:
884 dev_vdbg(dwc->dev, "Status Phase\n");
885 dwc3_ep0_complete_status(dwc, event);
888 WARN(true, "UNKNOWN ep0state %d\n", dwc->ep0state);
892 static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
893 struct dwc3_ep *dep, struct dwc3_request *req)
897 req->direction = !!dep->number;
899 if (req->request.length == 0) {
900 ret = dwc3_ep0_start_trans(dwc, dep->number,
901 dwc->ctrl_req_addr, 0,
902 DWC3_TRBCTL_CONTROL_DATA);
903 } else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
904 && (dep->number == 0)) {
908 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
911 dev_dbg(dwc->dev, "failed to map request\n");
915 WARN_ON(req->request.length > DWC3_EP0_BOUNCE_SIZE);
917 maxpacket = dep->endpoint.maxpacket;
918 transfer_size = roundup(req->request.length, maxpacket);
920 dwc->ep0_bounced = true;
923 * REVISIT in case request length is bigger than
924 * DWC3_EP0_BOUNCE_SIZE we will need two chained
925 * TRBs to handle the transfer.
927 ret = dwc3_ep0_start_trans(dwc, dep->number,
928 dwc->ep0_bounce_addr, transfer_size,
929 DWC3_TRBCTL_CONTROL_DATA);
931 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
934 dev_dbg(dwc->dev, "failed to map request\n");
938 ret = dwc3_ep0_start_trans(dwc, dep->number, req->request.dma,
939 req->request.length, DWC3_TRBCTL_CONTROL_DATA);
945 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep)
947 struct dwc3 *dwc = dep->dwc;
950 type = dwc->three_stage_setup ? DWC3_TRBCTL_CONTROL_STATUS3
951 : DWC3_TRBCTL_CONTROL_STATUS2;
953 return dwc3_ep0_start_trans(dwc, dep->number,
954 dwc->ctrl_req_addr, 0, type);
957 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
959 if (dwc->resize_fifos) {
960 dev_dbg(dwc->dev, "starting to resize fifos\n");
961 dwc3_gadget_resize_tx_fifos(dwc);
962 dwc->resize_fifos = 0;
965 WARN_ON(dwc3_ep0_start_control_status(dep));
968 static void dwc3_ep0_do_control_status(struct dwc3 *dwc,
969 const struct dwc3_event_depevt *event)
971 struct dwc3_ep *dep = dwc->eps[event->endpoint_number];
973 __dwc3_ep0_do_control_status(dwc, dep);
976 static void dwc3_ep0_end_control_data(struct dwc3 *dwc, struct dwc3_ep *dep)
978 struct dwc3_gadget_ep_cmd_params params;
982 if (!dep->resource_index)
985 cmd = DWC3_DEPCMD_ENDTRANSFER;
986 cmd |= DWC3_DEPCMD_CMDIOC;
987 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
988 memset(¶ms, 0, sizeof(params));
989 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
991 dep->resource_index = 0;
994 static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
995 const struct dwc3_event_depevt *event)
997 dwc->setup_packet_pending = true;
999 switch (event->status) {
1000 case DEPEVT_STATUS_CONTROL_DATA:
1001 dev_vdbg(dwc->dev, "Control Data\n");
1004 * We already have a DATA transfer in the controller's cache,
1005 * if we receive a XferNotReady(DATA) we will ignore it, unless
1006 * it's for the wrong direction.
1008 * In that case, we must issue END_TRANSFER command to the Data
1009 * Phase we already have started and issue SetStall on the
1012 if (dwc->ep0_expect_in != event->endpoint_number) {
1013 struct dwc3_ep *dep = dwc->eps[dwc->ep0_expect_in];
1015 dev_vdbg(dwc->dev, "Wrong direction for Data phase\n");
1016 dwc3_ep0_end_control_data(dwc, dep);
1017 dwc3_ep0_stall_and_restart(dwc);
1023 case DEPEVT_STATUS_CONTROL_STATUS:
1024 if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
1027 dev_vdbg(dwc->dev, "Control Status\n");
1029 dwc->ep0state = EP0_STATUS_PHASE;
1031 if (dwc->delayed_status) {
1032 WARN_ON_ONCE(event->endpoint_number != 1);
1033 dev_vdbg(dwc->dev, "Mass Storage delayed status\n");
1037 dwc3_ep0_do_control_status(dwc, event);
1041 void dwc3_ep0_interrupt(struct dwc3 *dwc,
1042 const struct dwc3_event_depevt *event)
1044 u8 epnum = event->endpoint_number;
1046 dev_dbg(dwc->dev, "%s while ep%d%s in state '%s'\n",
1047 dwc3_ep_event_string(event->endpoint_event),
1048 epnum >> 1, (epnum & 1) ? "in" : "out",
1049 dwc3_ep0_state_string(dwc->ep0state));
1051 switch (event->endpoint_event) {
1052 case DWC3_DEPEVT_XFERCOMPLETE:
1053 dwc3_ep0_xfer_complete(dwc, event);
1056 case DWC3_DEPEVT_XFERNOTREADY:
1057 dwc3_ep0_xfernotready(dwc, event);
1060 case DWC3_DEPEVT_XFERINPROGRESS:
1061 case DWC3_DEPEVT_RXTXFIFOEVT:
1062 case DWC3_DEPEVT_STREAMEVT:
1063 case DWC3_DEPEVT_EPCMDCMPLT: