2 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
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/delay.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/platform_device.h>
44 #include <linux/pm_runtime.h>
45 #include <linux/interrupt.h>
47 #include <linux/list.h>
48 #include <linux/dma-mapping.h>
50 #include <linux/usb/ch9.h>
51 #include <linux/usb/gadget.h>
58 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
59 * @dwc: pointer to our context structure
60 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
62 * Caller should take care of locking. This function will
63 * return 0 on success or -EINVAL if wrong Test Selector
66 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
70 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
71 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
85 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
91 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
92 * @dwc: pointer to our context structure
93 * @state: the state to put link into
95 * Caller should take care of locking. This function will
96 * return 0 on success or -ETIMEDOUT.
98 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
103 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
104 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
106 /* set requested state */
107 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
108 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
110 /* wait for a change in DSTS */
112 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
114 if (DWC3_DSTS_USBLNKST(reg) == state)
120 dev_vdbg(dwc->dev, "link state change request timed out\n");
126 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
127 * @dwc: pointer to our context structure
129 * This function will a best effort FIFO allocation in order
130 * to improve FIFO usage and throughput, while still allowing
131 * us to enable as many endpoints as possible.
133 * Keep in mind that this operation will be highly dependent
134 * on the configured size for RAM1 - which contains TxFifo -,
135 * the amount of endpoints enabled on coreConsultant tool, and
136 * the width of the Master Bus.
138 * In the ideal world, we would always be able to satisfy the
139 * following equation:
141 * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
142 * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
144 * Unfortunately, due to many variables that's not always the case.
146 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
148 int last_fifo_depth = 0;
154 if (!dwc->needs_fifo_resize)
157 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
158 mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
160 /* MDWIDTH is represented in bits, we need it in bytes */
164 * FIXME For now we will only allocate 1 wMaxPacketSize space
165 * for each enabled endpoint, later patches will come to
166 * improve this algorithm so that we better use the internal
169 for (num = 0; num < DWC3_ENDPOINTS_NUM; num++) {
170 struct dwc3_ep *dep = dwc->eps[num];
171 int fifo_number = dep->number >> 1;
175 if (!(dep->number & 1))
178 if (!(dep->flags & DWC3_EP_ENABLED))
181 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
182 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
186 * REVISIT: the following assumes we will always have enough
187 * space available on the FIFO RAM for all possible use cases.
188 * Make sure that's true somehow and change FIFO allocation
191 * If we have Bulk or Isochronous endpoints, we want
192 * them to be able to be very, very fast. So we're giving
193 * those endpoints a fifo_size which is enough for 3 full
196 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
199 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
201 fifo_size |= (last_fifo_depth << 16);
203 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
204 dep->name, last_fifo_depth, fifo_size & 0xffff);
206 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(fifo_number),
209 last_fifo_depth += (fifo_size & 0xffff);
215 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
218 struct dwc3 *dwc = dep->dwc;
221 if (req->request.num_mapped_sgs)
222 dep->busy_slot += req->request.num_mapped_sgs;
227 * Skip LINK TRB. We can't use req->trb and check for
228 * DWC3_TRBCTL_LINK_TRB because it points the TRB we just
229 * completed (not the LINK TRB).
231 if (((dep->busy_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
232 usb_endpoint_xfer_isoc(dep->endpoint.desc))
235 list_del(&req->list);
238 if (req->request.status == -EINPROGRESS)
239 req->request.status = status;
241 usb_gadget_unmap_request(&dwc->gadget, &req->request,
244 dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
245 req, dep->name, req->request.actual,
246 req->request.length, status);
248 spin_unlock(&dwc->lock);
249 req->request.complete(&dep->endpoint, &req->request);
250 spin_lock(&dwc->lock);
253 static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
256 case DWC3_DEPCMD_DEPSTARTCFG:
257 return "Start New Configuration";
258 case DWC3_DEPCMD_ENDTRANSFER:
259 return "End Transfer";
260 case DWC3_DEPCMD_UPDATETRANSFER:
261 return "Update Transfer";
262 case DWC3_DEPCMD_STARTTRANSFER:
263 return "Start Transfer";
264 case DWC3_DEPCMD_CLEARSTALL:
265 return "Clear Stall";
266 case DWC3_DEPCMD_SETSTALL:
268 case DWC3_DEPCMD_GETSEQNUMBER:
269 return "Get Data Sequence Number";
270 case DWC3_DEPCMD_SETTRANSFRESOURCE:
271 return "Set Endpoint Transfer Resource";
272 case DWC3_DEPCMD_SETEPCONFIG:
273 return "Set Endpoint Configuration";
275 return "UNKNOWN command";
279 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
284 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
285 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
288 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
289 if (!(reg & DWC3_DGCMD_CMDACT)) {
290 dev_vdbg(dwc->dev, "Command Complete --> %d\n",
291 DWC3_DGCMD_STATUS(reg));
296 * We can't sleep here, because it's also called from
306 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
307 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
309 struct dwc3_ep *dep = dwc->eps[ep];
313 dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n",
315 dwc3_gadget_ep_cmd_string(cmd), params->param0,
316 params->param1, params->param2);
318 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
319 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
320 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
322 dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
324 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
325 if (!(reg & DWC3_DEPCMD_CMDACT)) {
326 dev_vdbg(dwc->dev, "Command Complete --> %d\n",
327 DWC3_DEPCMD_STATUS(reg));
332 * We can't sleep here, because it is also called from
343 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
344 struct dwc3_trb *trb)
346 u32 offset = (char *) trb - (char *) dep->trb_pool;
348 return dep->trb_pool_dma + offset;
351 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
353 struct dwc3 *dwc = dep->dwc;
358 if (dep->number == 0 || dep->number == 1)
361 dep->trb_pool = dma_alloc_coherent(dwc->dev,
362 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
363 &dep->trb_pool_dma, GFP_KERNEL);
364 if (!dep->trb_pool) {
365 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
373 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
375 struct dwc3 *dwc = dep->dwc;
377 dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
378 dep->trb_pool, dep->trb_pool_dma);
380 dep->trb_pool = NULL;
381 dep->trb_pool_dma = 0;
384 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
386 struct dwc3_gadget_ep_cmd_params params;
389 memset(¶ms, 0x00, sizeof(params));
391 if (dep->number != 1) {
392 cmd = DWC3_DEPCMD_DEPSTARTCFG;
393 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
394 if (dep->number > 1) {
395 if (dwc->start_config_issued)
397 dwc->start_config_issued = true;
398 cmd |= DWC3_DEPCMD_PARAM(2);
401 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms);
407 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
408 const struct usb_endpoint_descriptor *desc,
409 const struct usb_ss_ep_comp_descriptor *comp_desc)
411 struct dwc3_gadget_ep_cmd_params params;
413 memset(¶ms, 0x00, sizeof(params));
415 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
416 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc))
417 | DWC3_DEPCFG_BURST_SIZE(dep->endpoint.maxburst);
419 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
420 | DWC3_DEPCFG_XFER_NOT_READY_EN;
422 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
423 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
424 | DWC3_DEPCFG_STREAM_EVENT_EN;
425 dep->stream_capable = true;
428 if (usb_endpoint_xfer_isoc(desc))
429 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
432 * We are doing 1:1 mapping for endpoints, meaning
433 * Physical Endpoints 2 maps to Logical Endpoint 2 and
434 * so on. We consider the direction bit as part of the physical
435 * endpoint number. So USB endpoint 0x81 is 0x03.
437 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
440 * We must use the lower 16 TX FIFOs even though
444 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
446 if (desc->bInterval) {
447 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
448 dep->interval = 1 << (desc->bInterval - 1);
451 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
452 DWC3_DEPCMD_SETEPCONFIG, ¶ms);
455 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
457 struct dwc3_gadget_ep_cmd_params params;
459 memset(¶ms, 0x00, sizeof(params));
461 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
463 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
464 DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms);
468 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
469 * @dep: endpoint to be initialized
470 * @desc: USB Endpoint Descriptor
472 * Caller should take care of locking
474 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
475 const struct usb_endpoint_descriptor *desc,
476 const struct usb_ss_ep_comp_descriptor *comp_desc)
478 struct dwc3 *dwc = dep->dwc;
482 if (!(dep->flags & DWC3_EP_ENABLED)) {
483 ret = dwc3_gadget_start_config(dwc, dep);
488 ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc);
492 if (!(dep->flags & DWC3_EP_ENABLED)) {
493 struct dwc3_trb *trb_st_hw;
494 struct dwc3_trb *trb_link;
496 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
500 dep->endpoint.desc = desc;
501 dep->comp_desc = comp_desc;
502 dep->type = usb_endpoint_type(desc);
503 dep->flags |= DWC3_EP_ENABLED;
505 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
506 reg |= DWC3_DALEPENA_EP(dep->number);
507 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
509 if (!usb_endpoint_xfer_isoc(desc))
512 memset(&trb_link, 0, sizeof(trb_link));
514 /* Link TRB for ISOC. The HWO bit is never reset */
515 trb_st_hw = &dep->trb_pool[0];
517 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
519 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
520 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
521 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
522 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
528 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum);
529 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
531 struct dwc3_request *req;
533 if (!list_empty(&dep->req_queued))
534 dwc3_stop_active_transfer(dwc, dep->number);
536 while (!list_empty(&dep->request_list)) {
537 req = next_request(&dep->request_list);
539 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
544 * __dwc3_gadget_ep_disable - Disables a HW endpoint
545 * @dep: the endpoint to disable
547 * This function also removes requests which are currently processed ny the
548 * hardware and those which are not yet scheduled.
549 * Caller should take care of locking.
551 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
553 struct dwc3 *dwc = dep->dwc;
556 dwc3_remove_requests(dwc, dep);
558 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
559 reg &= ~DWC3_DALEPENA_EP(dep->number);
560 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
562 dep->stream_capable = false;
563 dep->endpoint.desc = NULL;
564 dep->comp_desc = NULL;
571 /* -------------------------------------------------------------------------- */
573 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
574 const struct usb_endpoint_descriptor *desc)
579 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
584 /* -------------------------------------------------------------------------- */
586 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
587 const struct usb_endpoint_descriptor *desc)
594 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
595 pr_debug("dwc3: invalid parameters\n");
599 if (!desc->wMaxPacketSize) {
600 pr_debug("dwc3: missing wMaxPacketSize\n");
604 dep = to_dwc3_ep(ep);
607 switch (usb_endpoint_type(desc)) {
608 case USB_ENDPOINT_XFER_CONTROL:
609 strlcat(dep->name, "-control", sizeof(dep->name));
611 case USB_ENDPOINT_XFER_ISOC:
612 strlcat(dep->name, "-isoc", sizeof(dep->name));
614 case USB_ENDPOINT_XFER_BULK:
615 strlcat(dep->name, "-bulk", sizeof(dep->name));
617 case USB_ENDPOINT_XFER_INT:
618 strlcat(dep->name, "-int", sizeof(dep->name));
621 dev_err(dwc->dev, "invalid endpoint transfer type\n");
624 if (dep->flags & DWC3_EP_ENABLED) {
625 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
630 dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
632 spin_lock_irqsave(&dwc->lock, flags);
633 ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc);
634 spin_unlock_irqrestore(&dwc->lock, flags);
639 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
647 pr_debug("dwc3: invalid parameters\n");
651 dep = to_dwc3_ep(ep);
654 if (!(dep->flags & DWC3_EP_ENABLED)) {
655 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
660 snprintf(dep->name, sizeof(dep->name), "ep%d%s",
662 (dep->number & 1) ? "in" : "out");
664 spin_lock_irqsave(&dwc->lock, flags);
665 ret = __dwc3_gadget_ep_disable(dep);
666 spin_unlock_irqrestore(&dwc->lock, flags);
671 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
674 struct dwc3_request *req;
675 struct dwc3_ep *dep = to_dwc3_ep(ep);
676 struct dwc3 *dwc = dep->dwc;
678 req = kzalloc(sizeof(*req), gfp_flags);
680 dev_err(dwc->dev, "not enough memory\n");
684 req->epnum = dep->number;
687 return &req->request;
690 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
691 struct usb_request *request)
693 struct dwc3_request *req = to_dwc3_request(request);
699 * dwc3_prepare_one_trb - setup one TRB from one request
700 * @dep: endpoint for which this request is prepared
701 * @req: dwc3_request pointer
703 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
704 struct dwc3_request *req, dma_addr_t dma,
705 unsigned length, unsigned last, unsigned chain)
707 struct dwc3 *dwc = dep->dwc;
708 struct dwc3_trb *trb;
710 unsigned int cur_slot;
712 dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
713 dep->name, req, (unsigned long long) dma,
714 length, last ? " last" : "",
715 chain ? " chain" : "");
717 trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
718 cur_slot = dep->free_slot;
721 /* Skip the LINK-TRB on ISOC */
722 if (((cur_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
723 usb_endpoint_xfer_isoc(dep->endpoint.desc))
727 dwc3_gadget_move_request_queued(req);
729 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
732 trb->size = DWC3_TRB_SIZE_LENGTH(length);
733 trb->bpl = lower_32_bits(dma);
734 trb->bph = upper_32_bits(dma);
736 switch (usb_endpoint_type(dep->endpoint.desc)) {
737 case USB_ENDPOINT_XFER_CONTROL:
738 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
741 case USB_ENDPOINT_XFER_ISOC:
742 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
744 /* IOC every DWC3_TRB_NUM / 4 so we can refill */
745 if (!(cur_slot % (DWC3_TRB_NUM / 4)))
746 trb->ctrl |= DWC3_TRB_CTRL_IOC;
749 case USB_ENDPOINT_XFER_BULK:
750 case USB_ENDPOINT_XFER_INT:
751 trb->ctrl = DWC3_TRBCTL_NORMAL;
755 * This is only possible with faulty memory because we
756 * checked it already :)
761 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
762 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
763 trb->ctrl |= DWC3_TRB_CTRL_CSP;
766 trb->ctrl |= DWC3_TRB_CTRL_CHN;
769 trb->ctrl |= DWC3_TRB_CTRL_LST;
772 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
773 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
775 trb->ctrl |= DWC3_TRB_CTRL_HWO;
779 * dwc3_prepare_trbs - setup TRBs from requests
780 * @dep: endpoint for which requests are being prepared
781 * @starting: true if the endpoint is idle and no requests are queued.
783 * The function goes through the requests list and sets up TRBs for the
784 * transfers. The function returns once there are no more TRBs available or
785 * it runs out of requests.
787 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
789 struct dwc3_request *req, *n;
792 unsigned int last_one = 0;
794 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
796 /* the first request must not be queued */
797 trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
799 /* Can't wrap around on a non-isoc EP since there's no link TRB */
800 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
801 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
807 * If busy & slot are equal than it is either full or empty. If we are
808 * starting to process requests then we are empty. Otherwise we are
809 * full and don't do anything
814 trbs_left = DWC3_TRB_NUM;
816 * In case we start from scratch, we queue the ISOC requests
817 * starting from slot 1. This is done because we use ring
818 * buffer and have no LST bit to stop us. Instead, we place
819 * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
820 * after the first request so we start at slot 1 and have
821 * 7 requests proceed before we hit the first IOC.
822 * Other transfer types don't use the ring buffer and are
823 * processed from the first TRB until the last one. Since we
824 * don't wrap around we have to start at the beginning.
826 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
835 /* The last TRB is a link TRB, not used for xfer */
836 if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
839 list_for_each_entry_safe(req, n, &dep->request_list, list) {
843 if (req->request.num_mapped_sgs > 0) {
844 struct usb_request *request = &req->request;
845 struct scatterlist *sg = request->sg;
846 struct scatterlist *s;
849 for_each_sg(sg, s, request->num_mapped_sgs, i) {
850 unsigned chain = true;
852 length = sg_dma_len(s);
853 dma = sg_dma_address(s);
855 if (i == (request->num_mapped_sgs - 1) ||
868 dwc3_prepare_one_trb(dep, req, dma, length,
875 dma = req->request.dma;
876 length = req->request.length;
882 /* Is this the last request? */
883 if (list_is_last(&req->list, &dep->request_list))
886 dwc3_prepare_one_trb(dep, req, dma, length,
895 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
898 struct dwc3_gadget_ep_cmd_params params;
899 struct dwc3_request *req;
900 struct dwc3 *dwc = dep->dwc;
904 if (start_new && (dep->flags & DWC3_EP_BUSY)) {
905 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
908 dep->flags &= ~DWC3_EP_PENDING_REQUEST;
911 * If we are getting here after a short-out-packet we don't enqueue any
912 * new requests as we try to set the IOC bit only on the last request.
915 if (list_empty(&dep->req_queued))
916 dwc3_prepare_trbs(dep, start_new);
918 /* req points to the first request which will be sent */
919 req = next_request(&dep->req_queued);
921 dwc3_prepare_trbs(dep, start_new);
924 * req points to the first request where HWO changed from 0 to 1
926 req = next_request(&dep->req_queued);
929 dep->flags |= DWC3_EP_PENDING_REQUEST;
933 memset(¶ms, 0, sizeof(params));
934 params.param0 = upper_32_bits(req->trb_dma);
935 params.param1 = lower_32_bits(req->trb_dma);
938 cmd = DWC3_DEPCMD_STARTTRANSFER;
940 cmd = DWC3_DEPCMD_UPDATETRANSFER;
942 cmd |= DWC3_DEPCMD_PARAM(cmd_param);
943 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
945 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
948 * FIXME we need to iterate over the list of requests
949 * here and stop, unmap, free and del each of the linked
950 * requests instead of what we do now.
952 usb_gadget_unmap_request(&dwc->gadget, &req->request,
954 list_del(&req->list);
958 dep->flags |= DWC3_EP_BUSY;
961 dep->res_trans_idx = dwc3_gadget_ep_get_transfer_index(dwc,
963 WARN_ON_ONCE(!dep->res_trans_idx);
969 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
971 struct dwc3 *dwc = dep->dwc;
974 req->request.actual = 0;
975 req->request.status = -EINPROGRESS;
976 req->direction = dep->direction;
977 req->epnum = dep->number;
980 * We only add to our list of requests now and
981 * start consuming the list once we get XferNotReady
984 * That way, we avoid doing anything that we don't need
985 * to do now and defer it until the point we receive a
986 * particular token from the Host side.
988 * This will also avoid Host cancelling URBs due to too
991 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
996 list_add_tail(&req->list, &dep->request_list);
998 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && (dep->flags & DWC3_EP_BUSY))
999 dep->flags |= DWC3_EP_PENDING_REQUEST;
1002 * There are two special cases:
1004 * 1. XferNotReady with empty list of requests. We need to kick the
1005 * transfer here in that situation, otherwise we will be NAKing
1006 * forever. If we get XferNotReady before gadget driver has a
1007 * chance to queue a request, we will ACK the IRQ but won't be
1008 * able to receive the data until the next request is queued.
1009 * The following code is handling exactly that.
1011 * 2. XferInProgress on Isoc EP with an active transfer. We need to
1012 * kick the transfer here after queuing a request, otherwise the
1013 * core may not see the modified TRB(s).
1015 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1017 int start_trans = 1;
1018 u8 trans_idx = dep->res_trans_idx;
1020 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1021 (dep->flags & DWC3_EP_BUSY)) {
1023 WARN_ON_ONCE(!trans_idx);
1028 ret = __dwc3_gadget_kick_transfer(dep, trans_idx, start_trans);
1029 if (ret && ret != -EBUSY) {
1030 struct dwc3 *dwc = dep->dwc;
1032 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1040 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1043 struct dwc3_request *req = to_dwc3_request(request);
1044 struct dwc3_ep *dep = to_dwc3_ep(ep);
1045 struct dwc3 *dwc = dep->dwc;
1047 unsigned long flags;
1051 if (!dep->endpoint.desc) {
1052 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1057 dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1058 request, ep->name, request->length);
1060 spin_lock_irqsave(&dwc->lock, flags);
1061 ret = __dwc3_gadget_ep_queue(dep, req);
1062 spin_unlock_irqrestore(&dwc->lock, flags);
1067 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1068 struct usb_request *request)
1070 struct dwc3_request *req = to_dwc3_request(request);
1071 struct dwc3_request *r = NULL;
1073 struct dwc3_ep *dep = to_dwc3_ep(ep);
1074 struct dwc3 *dwc = dep->dwc;
1076 unsigned long flags;
1079 spin_lock_irqsave(&dwc->lock, flags);
1081 list_for_each_entry(r, &dep->request_list, list) {
1087 list_for_each_entry(r, &dep->req_queued, list) {
1092 /* wait until it is processed */
1093 dwc3_stop_active_transfer(dwc, dep->number);
1096 dev_err(dwc->dev, "request %p was not queued to %s\n",
1103 /* giveback the request */
1104 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1107 spin_unlock_irqrestore(&dwc->lock, flags);
1112 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
1114 struct dwc3_gadget_ep_cmd_params params;
1115 struct dwc3 *dwc = dep->dwc;
1118 memset(¶ms, 0x00, sizeof(params));
1121 if (dep->number == 0 || dep->number == 1) {
1123 * Whenever EP0 is stalled, we will restart
1124 * the state machine, thus moving back to
1127 dwc->ep0state = EP0_SETUP_PHASE;
1130 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1131 DWC3_DEPCMD_SETSTALL, ¶ms);
1133 dev_err(dwc->dev, "failed to %s STALL on %s\n",
1134 value ? "set" : "clear",
1137 dep->flags |= DWC3_EP_STALL;
1139 if (dep->flags & DWC3_EP_WEDGE)
1142 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1143 DWC3_DEPCMD_CLEARSTALL, ¶ms);
1145 dev_err(dwc->dev, "failed to %s STALL on %s\n",
1146 value ? "set" : "clear",
1149 dep->flags &= ~DWC3_EP_STALL;
1155 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1157 struct dwc3_ep *dep = to_dwc3_ep(ep);
1158 struct dwc3 *dwc = dep->dwc;
1160 unsigned long flags;
1164 spin_lock_irqsave(&dwc->lock, flags);
1166 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1167 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1172 ret = __dwc3_gadget_ep_set_halt(dep, value);
1174 spin_unlock_irqrestore(&dwc->lock, flags);
1179 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1181 struct dwc3_ep *dep = to_dwc3_ep(ep);
1182 struct dwc3 *dwc = dep->dwc;
1183 unsigned long flags;
1185 spin_lock_irqsave(&dwc->lock, flags);
1186 dep->flags |= DWC3_EP_WEDGE;
1187 spin_unlock_irqrestore(&dwc->lock, flags);
1189 return dwc3_gadget_ep_set_halt(ep, 1);
1192 /* -------------------------------------------------------------------------- */
1194 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1195 .bLength = USB_DT_ENDPOINT_SIZE,
1196 .bDescriptorType = USB_DT_ENDPOINT,
1197 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1200 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1201 .enable = dwc3_gadget_ep0_enable,
1202 .disable = dwc3_gadget_ep0_disable,
1203 .alloc_request = dwc3_gadget_ep_alloc_request,
1204 .free_request = dwc3_gadget_ep_free_request,
1205 .queue = dwc3_gadget_ep0_queue,
1206 .dequeue = dwc3_gadget_ep_dequeue,
1207 .set_halt = dwc3_gadget_ep_set_halt,
1208 .set_wedge = dwc3_gadget_ep_set_wedge,
1211 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1212 .enable = dwc3_gadget_ep_enable,
1213 .disable = dwc3_gadget_ep_disable,
1214 .alloc_request = dwc3_gadget_ep_alloc_request,
1215 .free_request = dwc3_gadget_ep_free_request,
1216 .queue = dwc3_gadget_ep_queue,
1217 .dequeue = dwc3_gadget_ep_dequeue,
1218 .set_halt = dwc3_gadget_ep_set_halt,
1219 .set_wedge = dwc3_gadget_ep_set_wedge,
1222 /* -------------------------------------------------------------------------- */
1224 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1226 struct dwc3 *dwc = gadget_to_dwc(g);
1229 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1230 return DWC3_DSTS_SOFFN(reg);
1233 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1235 struct dwc3 *dwc = gadget_to_dwc(g);
1237 unsigned long timeout;
1238 unsigned long flags;
1247 spin_lock_irqsave(&dwc->lock, flags);
1250 * According to the Databook Remote wakeup request should
1251 * be issued only when the device is in early suspend state.
1253 * We can check that via USB Link State bits in DSTS register.
1255 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1257 speed = reg & DWC3_DSTS_CONNECTSPD;
1258 if (speed == DWC3_DSTS_SUPERSPEED) {
1259 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1264 link_state = DWC3_DSTS_USBLNKST(reg);
1266 switch (link_state) {
1267 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1268 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1271 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1277 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1279 dev_err(dwc->dev, "failed to put link in Recovery\n");
1283 /* write zeroes to Link Change Request */
1284 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1285 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1287 /* poll until Link State changes to ON */
1288 timeout = jiffies + msecs_to_jiffies(100);
1290 while (!time_after(jiffies, timeout)) {
1291 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1293 /* in HS, means ON */
1294 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1298 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1299 dev_err(dwc->dev, "failed to send remote wakeup\n");
1304 spin_unlock_irqrestore(&dwc->lock, flags);
1309 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1312 struct dwc3 *dwc = gadget_to_dwc(g);
1313 unsigned long flags;
1315 spin_lock_irqsave(&dwc->lock, flags);
1316 dwc->is_selfpowered = !!is_selfpowered;
1317 spin_unlock_irqrestore(&dwc->lock, flags);
1322 static void dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
1327 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1329 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1330 reg |= (DWC3_DCTL_RUN_STOP
1331 | DWC3_DCTL_TRGTULST_RX_DET);
1333 reg &= ~DWC3_DCTL_RUN_STOP;
1336 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1339 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1341 if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1344 if (reg & DWC3_DSTS_DEVCTRLHLT)
1353 dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1355 ? dwc->gadget_driver->function : "no-function",
1356 is_on ? "connect" : "disconnect");
1359 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1361 struct dwc3 *dwc = gadget_to_dwc(g);
1362 unsigned long flags;
1366 spin_lock_irqsave(&dwc->lock, flags);
1367 dwc3_gadget_run_stop(dwc, is_on);
1368 spin_unlock_irqrestore(&dwc->lock, flags);
1373 static int dwc3_gadget_start(struct usb_gadget *g,
1374 struct usb_gadget_driver *driver)
1376 struct dwc3 *dwc = gadget_to_dwc(g);
1377 struct dwc3_ep *dep;
1378 unsigned long flags;
1382 spin_lock_irqsave(&dwc->lock, flags);
1384 if (dwc->gadget_driver) {
1385 dev_err(dwc->dev, "%s is already bound to %s\n",
1387 dwc->gadget_driver->driver.name);
1392 dwc->gadget_driver = driver;
1393 dwc->gadget.dev.driver = &driver->driver;
1395 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1396 reg &= ~(DWC3_DCFG_SPEED_MASK);
1399 * WORKAROUND: DWC3 revision < 2.20a have an issue
1400 * which would cause metastability state on Run/Stop
1401 * bit if we try to force the IP to USB2-only mode.
1403 * Because of that, we cannot configure the IP to any
1404 * speed other than the SuperSpeed
1408 * STAR#9000525659: Clock Domain Crossing on DCTL in
1411 if (dwc->revision < DWC3_REVISION_220A)
1412 reg |= DWC3_DCFG_SUPERSPEED;
1414 reg |= dwc->maximum_speed;
1415 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1417 dwc->start_config_issued = false;
1419 /* Start with SuperSpeed Default */
1420 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1423 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL);
1425 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1430 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL);
1432 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1436 /* begin to receive SETUP packets */
1437 dwc->ep0state = EP0_SETUP_PHASE;
1438 dwc3_ep0_out_start(dwc);
1440 spin_unlock_irqrestore(&dwc->lock, flags);
1445 __dwc3_gadget_ep_disable(dwc->eps[0]);
1448 spin_unlock_irqrestore(&dwc->lock, flags);
1453 static int dwc3_gadget_stop(struct usb_gadget *g,
1454 struct usb_gadget_driver *driver)
1456 struct dwc3 *dwc = gadget_to_dwc(g);
1457 unsigned long flags;
1459 spin_lock_irqsave(&dwc->lock, flags);
1461 __dwc3_gadget_ep_disable(dwc->eps[0]);
1462 __dwc3_gadget_ep_disable(dwc->eps[1]);
1464 dwc->gadget_driver = NULL;
1465 dwc->gadget.dev.driver = NULL;
1467 spin_unlock_irqrestore(&dwc->lock, flags);
1471 static const struct usb_gadget_ops dwc3_gadget_ops = {
1472 .get_frame = dwc3_gadget_get_frame,
1473 .wakeup = dwc3_gadget_wakeup,
1474 .set_selfpowered = dwc3_gadget_set_selfpowered,
1475 .pullup = dwc3_gadget_pullup,
1476 .udc_start = dwc3_gadget_start,
1477 .udc_stop = dwc3_gadget_stop,
1480 /* -------------------------------------------------------------------------- */
1482 static int __devinit dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1484 struct dwc3_ep *dep;
1487 INIT_LIST_HEAD(&dwc->gadget.ep_list);
1489 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1490 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1492 dev_err(dwc->dev, "can't allocate endpoint %d\n",
1498 dep->number = epnum;
1499 dwc->eps[epnum] = dep;
1501 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1502 (epnum & 1) ? "in" : "out");
1503 dep->endpoint.name = dep->name;
1504 dep->direction = (epnum & 1);
1506 if (epnum == 0 || epnum == 1) {
1507 dep->endpoint.maxpacket = 512;
1508 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1510 dwc->gadget.ep0 = &dep->endpoint;
1514 dep->endpoint.maxpacket = 1024;
1515 dep->endpoint.max_streams = 15;
1516 dep->endpoint.ops = &dwc3_gadget_ep_ops;
1517 list_add_tail(&dep->endpoint.ep_list,
1518 &dwc->gadget.ep_list);
1520 ret = dwc3_alloc_trb_pool(dep);
1525 INIT_LIST_HEAD(&dep->request_list);
1526 INIT_LIST_HEAD(&dep->req_queued);
1532 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1534 struct dwc3_ep *dep;
1537 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1538 dep = dwc->eps[epnum];
1539 dwc3_free_trb_pool(dep);
1541 if (epnum != 0 && epnum != 1)
1542 list_del(&dep->endpoint.ep_list);
1548 static void dwc3_gadget_release(struct device *dev)
1550 dev_dbg(dev, "%s\n", __func__);
1553 /* -------------------------------------------------------------------------- */
1554 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1555 const struct dwc3_event_depevt *event, int status)
1557 struct dwc3_request *req;
1558 struct dwc3_trb *trb;
1560 unsigned int s_pkt = 0;
1563 req = next_request(&dep->req_queued);
1571 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1573 * We continue despite the error. There is not much we
1574 * can do. If we don't clean it up we loop forever. If
1575 * we skip the TRB then it gets overwritten after a
1576 * while since we use them in a ring buffer. A BUG()
1577 * would help. Lets hope that if this occurs, someone
1578 * fixes the root cause instead of looking away :)
1580 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1581 dep->name, req->trb);
1582 count = trb->size & DWC3_TRB_SIZE_MASK;
1584 if (dep->direction) {
1586 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1588 status = -ECONNRESET;
1591 if (count && (event->status & DEPEVT_STATUS_SHORT))
1596 * We assume here we will always receive the entire data block
1597 * which we should receive. Meaning, if we program RX to
1598 * receive 4K but we receive only 2K, we assume that's all we
1599 * should receive and we simply bounce the request back to the
1600 * gadget driver for further processing.
1602 req->request.actual += req->request.length - count;
1603 dwc3_gadget_giveback(dep, req, status);
1606 if ((event->status & DEPEVT_STATUS_LST) &&
1607 (trb->ctrl & DWC3_TRB_CTRL_LST))
1609 if ((event->status & DEPEVT_STATUS_IOC) &&
1610 (trb->ctrl & DWC3_TRB_CTRL_IOC))
1614 if ((event->status & DEPEVT_STATUS_IOC) &&
1615 (trb->ctrl & DWC3_TRB_CTRL_IOC))
1620 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1621 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1624 unsigned status = 0;
1627 if (event->status & DEPEVT_STATUS_BUSERR)
1628 status = -ECONNRESET;
1630 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1632 dep->flags &= ~DWC3_EP_BUSY;
1635 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1636 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1638 if (dwc->revision < DWC3_REVISION_183A) {
1642 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1643 struct dwc3_ep *dep = dwc->eps[i];
1645 if (!(dep->flags & DWC3_EP_ENABLED))
1648 if (!list_empty(&dep->req_queued))
1652 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1654 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1660 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1661 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1665 if (list_empty(&dep->request_list)) {
1666 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1671 mask = ~(dep->interval - 1);
1672 uf = event->parameters & mask;
1673 /* 4 micro frames in the future */
1674 uf += dep->interval * 4;
1676 __dwc3_gadget_kick_transfer(dep, uf, 1);
1679 static void dwc3_process_ep_cmd_complete(struct dwc3_ep *dep,
1680 const struct dwc3_event_depevt *event)
1682 struct dwc3 *dwc = dep->dwc;
1683 struct dwc3_event_depevt mod_ev = *event;
1686 * We were asked to remove one request. It is possible that this
1687 * request and a few others were started together and have the same
1688 * transfer index. Since we stopped the complete endpoint we don't
1689 * know how many requests were already completed (and not yet)
1690 * reported and how could be done (later). We purge them all until
1691 * the end of the list.
1693 mod_ev.status = DEPEVT_STATUS_LST;
1694 dwc3_cleanup_done_reqs(dwc, dep, &mod_ev, -ESHUTDOWN);
1695 dep->flags &= ~DWC3_EP_BUSY;
1696 /* pending requests are ignored and are queued on XferNotReady */
1699 static void dwc3_ep_cmd_compl(struct dwc3_ep *dep,
1700 const struct dwc3_event_depevt *event)
1702 u32 param = event->parameters;
1703 u32 cmd_type = (param >> 8) & ((1 << 5) - 1);
1706 case DWC3_DEPCMD_ENDTRANSFER:
1707 dwc3_process_ep_cmd_complete(dep, event);
1709 case DWC3_DEPCMD_STARTTRANSFER:
1710 dep->res_trans_idx = param & 0x7f;
1713 printk(KERN_ERR "%s() unknown /unexpected type: %d\n",
1714 __func__, cmd_type);
1719 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1720 const struct dwc3_event_depevt *event)
1722 struct dwc3_ep *dep;
1723 u8 epnum = event->endpoint_number;
1725 dep = dwc->eps[epnum];
1727 dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1728 dwc3_ep_event_string(event->endpoint_event));
1730 if (epnum == 0 || epnum == 1) {
1731 dwc3_ep0_interrupt(dwc, event);
1735 switch (event->endpoint_event) {
1736 case DWC3_DEPEVT_XFERCOMPLETE:
1737 dep->res_trans_idx = 0;
1739 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1740 dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1745 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1747 case DWC3_DEPEVT_XFERINPROGRESS:
1748 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1749 dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1754 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1756 case DWC3_DEPEVT_XFERNOTREADY:
1757 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1758 dwc3_gadget_start_isoc(dwc, dep, event);
1762 dev_vdbg(dwc->dev, "%s: reason %s\n",
1763 dep->name, event->status &
1764 DEPEVT_STATUS_TRANSFER_ACTIVE
1766 : "Transfer Not Active");
1768 ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1769 if (!ret || ret == -EBUSY)
1772 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1777 case DWC3_DEPEVT_STREAMEVT:
1778 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
1779 dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
1784 switch (event->status) {
1785 case DEPEVT_STREAMEVT_FOUND:
1786 dev_vdbg(dwc->dev, "Stream %d found and started\n",
1790 case DEPEVT_STREAMEVT_NOTFOUND:
1793 dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
1796 case DWC3_DEPEVT_RXTXFIFOEVT:
1797 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
1799 case DWC3_DEPEVT_EPCMDCMPLT:
1800 dwc3_ep_cmd_compl(dep, event);
1805 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
1807 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
1808 spin_unlock(&dwc->lock);
1809 dwc->gadget_driver->disconnect(&dwc->gadget);
1810 spin_lock(&dwc->lock);
1814 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum)
1816 struct dwc3_ep *dep;
1817 struct dwc3_gadget_ep_cmd_params params;
1821 dep = dwc->eps[epnum];
1823 WARN_ON(!dep->res_trans_idx);
1824 if (dep->res_trans_idx) {
1825 cmd = DWC3_DEPCMD_ENDTRANSFER;
1826 cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC;
1827 cmd |= DWC3_DEPCMD_PARAM(dep->res_trans_idx);
1828 memset(¶ms, 0, sizeof(params));
1829 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
1831 dep->res_trans_idx = 0;
1835 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
1839 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1840 struct dwc3_ep *dep;
1842 dep = dwc->eps[epnum];
1843 if (!(dep->flags & DWC3_EP_ENABLED))
1846 dwc3_remove_requests(dwc, dep);
1850 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
1854 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1855 struct dwc3_ep *dep;
1856 struct dwc3_gadget_ep_cmd_params params;
1859 dep = dwc->eps[epnum];
1861 if (!(dep->flags & DWC3_EP_STALL))
1864 dep->flags &= ~DWC3_EP_STALL;
1866 memset(¶ms, 0, sizeof(params));
1867 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1868 DWC3_DEPCMD_CLEARSTALL, ¶ms);
1873 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
1875 dev_vdbg(dwc->dev, "%s\n", __func__);
1878 U1/U2 is powersave optimization. Skip it for now. Anyway we need to
1879 enable it before we can disable it.
1881 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1882 reg &= ~DWC3_DCTL_INITU1ENA;
1883 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1885 reg &= ~DWC3_DCTL_INITU2ENA;
1886 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1889 dwc3_stop_active_transfers(dwc);
1890 dwc3_disconnect_gadget(dwc);
1891 dwc->start_config_issued = false;
1893 dwc->gadget.speed = USB_SPEED_UNKNOWN;
1894 dwc->setup_packet_pending = false;
1897 static void dwc3_gadget_usb3_phy_power(struct dwc3 *dwc, int on)
1901 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
1904 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
1906 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
1908 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
1911 static void dwc3_gadget_usb2_phy_power(struct dwc3 *dwc, int on)
1915 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
1918 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
1920 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
1922 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
1925 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
1929 dev_vdbg(dwc->dev, "%s\n", __func__);
1932 * WORKAROUND: DWC3 revisions <1.88a have an issue which
1933 * would cause a missing Disconnect Event if there's a
1934 * pending Setup Packet in the FIFO.
1936 * There's no suggested workaround on the official Bug
1937 * report, which states that "unless the driver/application
1938 * is doing any special handling of a disconnect event,
1939 * there is no functional issue".
1941 * Unfortunately, it turns out that we _do_ some special
1942 * handling of a disconnect event, namely complete all
1943 * pending transfers, notify gadget driver of the
1944 * disconnection, and so on.
1946 * Our suggested workaround is to follow the Disconnect
1947 * Event steps here, instead, based on a setup_packet_pending
1948 * flag. Such flag gets set whenever we have a XferNotReady
1949 * event on EP0 and gets cleared on XferComplete for the
1954 * STAR#9000466709: RTL: Device : Disconnect event not
1955 * generated if setup packet pending in FIFO
1957 if (dwc->revision < DWC3_REVISION_188A) {
1958 if (dwc->setup_packet_pending)
1959 dwc3_gadget_disconnect_interrupt(dwc);
1962 /* after reset -> Default State */
1963 dwc->dev_state = DWC3_DEFAULT_STATE;
1966 dwc3_gadget_usb2_phy_power(dwc, true);
1967 dwc3_gadget_usb3_phy_power(dwc, true);
1969 if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
1970 dwc3_disconnect_gadget(dwc);
1972 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1973 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
1974 reg &= ~(DWC3_DCTL_INITU1ENA | DWC3_DCTL_INITU2ENA);
1975 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1976 dwc->test_mode = false;
1978 dwc3_stop_active_transfers(dwc);
1979 dwc3_clear_stall_all_ep(dwc);
1980 dwc->start_config_issued = false;
1982 /* Reset device address to zero */
1983 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1984 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
1985 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1988 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
1991 u32 usb30_clock = DWC3_GCTL_CLK_BUS;
1994 * We change the clock only at SS but I dunno why I would want to do
1995 * this. Maybe it becomes part of the power saving plan.
1998 if (speed != DWC3_DSTS_SUPERSPEED)
2002 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2003 * each time on Connect Done.
2008 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2009 reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2010 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2013 static void dwc3_gadget_disable_phy(struct dwc3 *dwc, u8 speed)
2016 case USB_SPEED_SUPER:
2017 dwc3_gadget_usb2_phy_power(dwc, false);
2019 case USB_SPEED_HIGH:
2020 case USB_SPEED_FULL:
2022 dwc3_gadget_usb3_phy_power(dwc, false);
2027 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2029 struct dwc3_gadget_ep_cmd_params params;
2030 struct dwc3_ep *dep;
2035 dev_vdbg(dwc->dev, "%s\n", __func__);
2037 memset(¶ms, 0x00, sizeof(params));
2039 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2040 speed = reg & DWC3_DSTS_CONNECTSPD;
2043 dwc3_update_ram_clk_sel(dwc, speed);
2046 case DWC3_DCFG_SUPERSPEED:
2048 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2049 * would cause a missing USB3 Reset event.
2051 * In such situations, we should force a USB3 Reset
2052 * event by calling our dwc3_gadget_reset_interrupt()
2057 * STAR#9000483510: RTL: SS : USB3 reset event may
2058 * not be generated always when the link enters poll
2060 if (dwc->revision < DWC3_REVISION_190A)
2061 dwc3_gadget_reset_interrupt(dwc);
2063 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2064 dwc->gadget.ep0->maxpacket = 512;
2065 dwc->gadget.speed = USB_SPEED_SUPER;
2067 case DWC3_DCFG_HIGHSPEED:
2068 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2069 dwc->gadget.ep0->maxpacket = 64;
2070 dwc->gadget.speed = USB_SPEED_HIGH;
2072 case DWC3_DCFG_FULLSPEED2:
2073 case DWC3_DCFG_FULLSPEED1:
2074 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2075 dwc->gadget.ep0->maxpacket = 64;
2076 dwc->gadget.speed = USB_SPEED_FULL;
2078 case DWC3_DCFG_LOWSPEED:
2079 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2080 dwc->gadget.ep0->maxpacket = 8;
2081 dwc->gadget.speed = USB_SPEED_LOW;
2085 /* Disable unneded PHY */
2086 dwc3_gadget_disable_phy(dwc, dwc->gadget.speed);
2089 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL);
2091 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2096 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL);
2098 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2103 * Configure PHY via GUSB3PIPECTLn if required.
2105 * Update GTXFIFOSIZn
2107 * In both cases reset values should be sufficient.
2111 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2113 dev_vdbg(dwc->dev, "%s\n", __func__);
2116 * TODO take core out of low power mode when that's
2120 dwc->gadget_driver->resume(&dwc->gadget);
2123 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2124 unsigned int evtinfo)
2126 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2129 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2130 * on the link partner, the USB session might do multiple entry/exit
2131 * of low power states before a transfer takes place.
2133 * Due to this problem, we might experience lower throughput. The
2134 * suggested workaround is to disable DCTL[12:9] bits if we're
2135 * transitioning from U1/U2 to U0 and enable those bits again
2136 * after a transfer completes and there are no pending transfers
2137 * on any of the enabled endpoints.
2139 * This is the first half of that workaround.
2143 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2144 * core send LGO_Ux entering U0
2146 if (dwc->revision < DWC3_REVISION_183A) {
2147 if (next == DWC3_LINK_STATE_U0) {
2151 switch (dwc->link_state) {
2152 case DWC3_LINK_STATE_U1:
2153 case DWC3_LINK_STATE_U2:
2154 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2155 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2156 | DWC3_DCTL_ACCEPTU2ENA
2157 | DWC3_DCTL_INITU1ENA
2158 | DWC3_DCTL_ACCEPTU1ENA);
2161 dwc->u1u2 = reg & u1u2;
2165 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2174 dwc->link_state = next;
2176 dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
2179 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2180 const struct dwc3_event_devt *event)
2182 switch (event->type) {
2183 case DWC3_DEVICE_EVENT_DISCONNECT:
2184 dwc3_gadget_disconnect_interrupt(dwc);
2186 case DWC3_DEVICE_EVENT_RESET:
2187 dwc3_gadget_reset_interrupt(dwc);
2189 case DWC3_DEVICE_EVENT_CONNECT_DONE:
2190 dwc3_gadget_conndone_interrupt(dwc);
2192 case DWC3_DEVICE_EVENT_WAKEUP:
2193 dwc3_gadget_wakeup_interrupt(dwc);
2195 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2196 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2198 case DWC3_DEVICE_EVENT_EOPF:
2199 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2201 case DWC3_DEVICE_EVENT_SOF:
2202 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2204 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2205 dev_vdbg(dwc->dev, "Erratic Error\n");
2207 case DWC3_DEVICE_EVENT_CMD_CMPL:
2208 dev_vdbg(dwc->dev, "Command Complete\n");
2210 case DWC3_DEVICE_EVENT_OVERFLOW:
2211 dev_vdbg(dwc->dev, "Overflow\n");
2214 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2218 static void dwc3_process_event_entry(struct dwc3 *dwc,
2219 const union dwc3_event *event)
2221 /* Endpoint IRQ, handle it and return early */
2222 if (event->type.is_devspec == 0) {
2224 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2227 switch (event->type.type) {
2228 case DWC3_EVENT_TYPE_DEV:
2229 dwc3_gadget_interrupt(dwc, &event->devt);
2231 /* REVISIT what to do with Carkit and I2C events ? */
2233 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2237 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2239 struct dwc3_event_buffer *evt;
2243 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2244 count &= DWC3_GEVNTCOUNT_MASK;
2248 evt = dwc->ev_buffs[buf];
2252 union dwc3_event event;
2254 event.raw = *(u32 *) (evt->buf + evt->lpos);
2256 dwc3_process_event_entry(dwc, &event);
2258 * XXX we wrap around correctly to the next entry as almost all
2259 * entries are 4 bytes in size. There is one entry which has 12
2260 * bytes which is a regular entry followed by 8 bytes data. ATM
2261 * I don't know how things are organized if were get next to the
2262 * a boundary so I worry about that once we try to handle that.
2264 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2267 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2273 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2275 struct dwc3 *dwc = _dwc;
2277 irqreturn_t ret = IRQ_NONE;
2279 spin_lock(&dwc->lock);
2281 for (i = 0; i < dwc->num_event_buffers; i++) {
2284 status = dwc3_process_event_buf(dwc, i);
2285 if (status == IRQ_HANDLED)
2289 spin_unlock(&dwc->lock);
2295 * dwc3_gadget_init - Initializes gadget related registers
2296 * @dwc: pointer to our controller context structure
2298 * Returns 0 on success otherwise negative errno.
2300 int __devinit dwc3_gadget_init(struct dwc3 *dwc)
2306 dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2307 &dwc->ctrl_req_addr, GFP_KERNEL);
2308 if (!dwc->ctrl_req) {
2309 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2314 dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2315 &dwc->ep0_trb_addr, GFP_KERNEL);
2316 if (!dwc->ep0_trb) {
2317 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2322 dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2323 if (!dwc->setup_buf) {
2324 dev_err(dwc->dev, "failed to allocate setup buffer\n");
2329 dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2330 DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2332 if (!dwc->ep0_bounce) {
2333 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2338 dev_set_name(&dwc->gadget.dev, "gadget");
2340 dwc->gadget.ops = &dwc3_gadget_ops;
2341 dwc->gadget.max_speed = USB_SPEED_SUPER;
2342 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2343 dwc->gadget.dev.parent = dwc->dev;
2344 dwc->gadget.sg_supported = true;
2346 dma_set_coherent_mask(&dwc->gadget.dev, dwc->dev->coherent_dma_mask);
2348 dwc->gadget.dev.dma_parms = dwc->dev->dma_parms;
2349 dwc->gadget.dev.dma_mask = dwc->dev->dma_mask;
2350 dwc->gadget.dev.release = dwc3_gadget_release;
2351 dwc->gadget.name = "dwc3-gadget";
2354 * REVISIT: Here we should clear all pending IRQs to be
2355 * sure we're starting from a well known location.
2358 ret = dwc3_gadget_init_endpoints(dwc);
2362 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
2364 ret = request_irq(irq, dwc3_interrupt, IRQF_SHARED,
2367 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
2372 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2373 reg |= DWC3_DCFG_LPM_CAP;
2374 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2376 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2377 reg |= DWC3_DCTL_ACCEPTU1ENA | DWC3_DCTL_ACCEPTU2ENA;
2378 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2380 /* Enable all but Start and End of Frame IRQs */
2381 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
2382 DWC3_DEVTEN_EVNTOVERFLOWEN |
2383 DWC3_DEVTEN_CMDCMPLTEN |
2384 DWC3_DEVTEN_ERRTICERREN |
2385 DWC3_DEVTEN_WKUPEVTEN |
2386 DWC3_DEVTEN_ULSTCNGEN |
2387 DWC3_DEVTEN_CONNECTDONEEN |
2388 DWC3_DEVTEN_USBRSTEN |
2389 DWC3_DEVTEN_DISCONNEVTEN);
2390 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
2392 ret = device_register(&dwc->gadget.dev);
2394 dev_err(dwc->dev, "failed to register gadget device\n");
2395 put_device(&dwc->gadget.dev);
2399 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2401 dev_err(dwc->dev, "failed to register udc\n");
2408 device_unregister(&dwc->gadget.dev);
2411 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2415 dwc3_gadget_free_endpoints(dwc);
2418 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2419 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2422 kfree(dwc->setup_buf);
2425 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2426 dwc->ep0_trb, dwc->ep0_trb_addr);
2429 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2430 dwc->ctrl_req, dwc->ctrl_req_addr);
2436 void dwc3_gadget_exit(struct dwc3 *dwc)
2440 usb_del_gadget_udc(&dwc->gadget);
2441 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
2443 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
2446 dwc3_gadget_free_endpoints(dwc);
2448 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2449 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2451 kfree(dwc->setup_buf);
2453 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2454 dwc->ep0_trb, dwc->ep0_trb_addr);
2456 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2457 dwc->ctrl_req, dwc->ctrl_req_addr);
2459 device_unregister(&dwc->gadget.dev);