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 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <linux/spinlock.h>
23 #include <linux/platform_device.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/interrupt.h>
27 #include <linux/list.h>
28 #include <linux/dma-mapping.h>
30 #include <linux/usb/ch9.h>
31 #include <linux/usb/gadget.h>
38 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes
39 * @dwc: pointer to our context structure
40 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
42 * Caller should take care of locking. This function will
43 * return 0 on success or -EINVAL if wrong Test Selector
46 int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
50 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
51 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
65 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
71 * dwc3_gadget_get_link_state - Gets current state of USB Link
72 * @dwc: pointer to our context structure
74 * Caller should take care of locking. This function will
75 * return the link state on success (>= 0) or -ETIMEDOUT.
77 int dwc3_gadget_get_link_state(struct dwc3 *dwc)
81 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
83 return DWC3_DSTS_USBLNKST(reg);
87 * dwc3_gadget_set_link_state - Sets USB Link to a particular State
88 * @dwc: pointer to our context structure
89 * @state: the state to put link into
91 * Caller should take care of locking. This function will
92 * return 0 on success or -ETIMEDOUT.
94 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
100 * Wait until device controller is ready. Only applies to 1.94a and
103 if (dwc->revision >= DWC3_REVISION_194A) {
105 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
106 if (reg & DWC3_DSTS_DCNRD)
116 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
117 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
119 /* set requested state */
120 reg |= DWC3_DCTL_ULSTCHNGREQ(state);
121 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
124 * The following code is racy when called from dwc3_gadget_wakeup,
125 * and is not needed, at least on newer versions
127 if (dwc->revision >= DWC3_REVISION_194A)
130 /* wait for a change in DSTS */
133 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
135 if (DWC3_DSTS_USBLNKST(reg) == state)
141 dev_vdbg(dwc->dev, "link state change request timed out\n");
147 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
148 * @dwc: pointer to our context structure
150 * This function will a best effort FIFO allocation in order
151 * to improve FIFO usage and throughput, while still allowing
152 * us to enable as many endpoints as possible.
154 * Keep in mind that this operation will be highly dependent
155 * on the configured size for RAM1 - which contains TxFifo -,
156 * the amount of endpoints enabled on coreConsultant tool, and
157 * the width of the Master Bus.
159 * In the ideal world, we would always be able to satisfy the
160 * following equation:
162 * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
163 * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
165 * Unfortunately, due to many variables that's not always the case.
167 int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
169 int last_fifo_depth = 0;
175 if (!dwc->needs_fifo_resize)
178 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
179 mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
181 /* MDWIDTH is represented in bits, we need it in bytes */
185 * FIXME For now we will only allocate 1 wMaxPacketSize space
186 * for each enabled endpoint, later patches will come to
187 * improve this algorithm so that we better use the internal
190 for (num = 0; num < dwc->num_in_eps; num++) {
191 /* bit0 indicates direction; 1 means IN ep */
192 struct dwc3_ep *dep = dwc->eps[(num << 1) | 1];
196 if (!(dep->flags & DWC3_EP_ENABLED))
199 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
200 || usb_endpoint_xfer_isoc(dep->endpoint.desc))
204 * REVISIT: the following assumes we will always have enough
205 * space available on the FIFO RAM for all possible use cases.
206 * Make sure that's true somehow and change FIFO allocation
209 * If we have Bulk or Isochronous endpoints, we want
210 * them to be able to be very, very fast. So we're giving
211 * those endpoints a fifo_size which is enough for 3 full
214 tmp = mult * (dep->endpoint.maxpacket + mdwidth);
217 fifo_size = DIV_ROUND_UP(tmp, mdwidth);
219 fifo_size |= (last_fifo_depth << 16);
221 dev_vdbg(dwc->dev, "%s: Fifo Addr %04x Size %d\n",
222 dep->name, last_fifo_depth, fifo_size & 0xffff);
224 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
226 last_fifo_depth += (fifo_size & 0xffff);
232 void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
235 struct dwc3 *dwc = dep->dwc;
243 * Skip LINK TRB. We can't use req->trb and check for
244 * DWC3_TRBCTL_LINK_TRB because it points the TRB we
245 * just completed (not the LINK TRB).
247 if (((dep->busy_slot & DWC3_TRB_MASK) ==
249 usb_endpoint_xfer_isoc(dep->endpoint.desc))
251 } while(++i < req->request.num_mapped_sgs);
254 list_del(&req->list);
257 if (req->request.status == -EINPROGRESS)
258 req->request.status = status;
260 if (dwc->ep0_bounced && dep->number == 0)
261 dwc->ep0_bounced = false;
263 usb_gadget_unmap_request(&dwc->gadget, &req->request,
266 dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
267 req, dep->name, req->request.actual,
268 req->request.length, status);
270 spin_unlock(&dwc->lock);
271 req->request.complete(&dep->endpoint, &req->request);
272 spin_lock(&dwc->lock);
275 static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
278 case DWC3_DEPCMD_DEPSTARTCFG:
279 return "Start New Configuration";
280 case DWC3_DEPCMD_ENDTRANSFER:
281 return "End Transfer";
282 case DWC3_DEPCMD_UPDATETRANSFER:
283 return "Update Transfer";
284 case DWC3_DEPCMD_STARTTRANSFER:
285 return "Start Transfer";
286 case DWC3_DEPCMD_CLEARSTALL:
287 return "Clear Stall";
288 case DWC3_DEPCMD_SETSTALL:
290 case DWC3_DEPCMD_GETEPSTATE:
291 return "Get Endpoint State";
292 case DWC3_DEPCMD_SETTRANSFRESOURCE:
293 return "Set Endpoint Transfer Resource";
294 case DWC3_DEPCMD_SETEPCONFIG:
295 return "Set Endpoint Configuration";
297 return "UNKNOWN command";
301 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
306 dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
307 dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
310 reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
311 if (!(reg & DWC3_DGCMD_CMDACT)) {
312 dev_vdbg(dwc->dev, "Command Complete --> %d\n",
313 DWC3_DGCMD_STATUS(reg));
318 * We can't sleep here, because it's also called from
328 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
329 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
331 struct dwc3_ep *dep = dwc->eps[ep];
335 dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n",
337 dwc3_gadget_ep_cmd_string(cmd), params->param0,
338 params->param1, params->param2);
340 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
341 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
342 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
344 dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
346 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
347 if (!(reg & DWC3_DEPCMD_CMDACT)) {
348 dev_vdbg(dwc->dev, "Command Complete --> %d\n",
349 DWC3_DEPCMD_STATUS(reg));
354 * We can't sleep here, because it is also called from
365 static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
366 struct dwc3_trb *trb)
368 u32 offset = (char *) trb - (char *) dep->trb_pool;
370 return dep->trb_pool_dma + offset;
373 static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
375 struct dwc3 *dwc = dep->dwc;
380 if (dep->number == 0 || dep->number == 1)
383 dep->trb_pool = dma_alloc_coherent(dwc->dev,
384 sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
385 &dep->trb_pool_dma, GFP_KERNEL);
386 if (!dep->trb_pool) {
387 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
395 static void dwc3_free_trb_pool(struct dwc3_ep *dep)
397 struct dwc3 *dwc = dep->dwc;
399 dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
400 dep->trb_pool, dep->trb_pool_dma);
402 dep->trb_pool = NULL;
403 dep->trb_pool_dma = 0;
406 static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
408 struct dwc3_gadget_ep_cmd_params params;
411 memset(¶ms, 0x00, sizeof(params));
413 if (dep->number != 1) {
414 cmd = DWC3_DEPCMD_DEPSTARTCFG;
415 /* XferRscIdx == 0 for ep0 and 2 for the remaining */
416 if (dep->number > 1) {
417 if (dwc->start_config_issued)
419 dwc->start_config_issued = true;
420 cmd |= DWC3_DEPCMD_PARAM(2);
423 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms);
429 static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
430 const struct usb_endpoint_descriptor *desc,
431 const struct usb_ss_ep_comp_descriptor *comp_desc,
432 bool ignore, bool restore)
434 struct dwc3_gadget_ep_cmd_params params;
436 memset(¶ms, 0x00, sizeof(params));
438 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
439 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
441 /* Burst size is only needed in SuperSpeed mode */
442 if (dwc->gadget.speed == USB_SPEED_SUPER) {
443 u32 burst = dep->endpoint.maxburst - 1;
445 params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
449 params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
452 params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
453 params.param2 |= dep->saved_state;
456 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
457 | DWC3_DEPCFG_XFER_NOT_READY_EN;
459 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
460 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
461 | DWC3_DEPCFG_STREAM_EVENT_EN;
462 dep->stream_capable = true;
465 if (usb_endpoint_xfer_isoc(desc))
466 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
469 * We are doing 1:1 mapping for endpoints, meaning
470 * Physical Endpoints 2 maps to Logical Endpoint 2 and
471 * so on. We consider the direction bit as part of the physical
472 * endpoint number. So USB endpoint 0x81 is 0x03.
474 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
477 * We must use the lower 16 TX FIFOs even though
481 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
483 if (desc->bInterval) {
484 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
485 dep->interval = 1 << (desc->bInterval - 1);
488 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
489 DWC3_DEPCMD_SETEPCONFIG, ¶ms);
492 static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
494 struct dwc3_gadget_ep_cmd_params params;
496 memset(¶ms, 0x00, sizeof(params));
498 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
500 return dwc3_send_gadget_ep_cmd(dwc, dep->number,
501 DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms);
505 * __dwc3_gadget_ep_enable - Initializes a HW endpoint
506 * @dep: endpoint to be initialized
507 * @desc: USB Endpoint Descriptor
509 * Caller should take care of locking
511 static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
512 const struct usb_endpoint_descriptor *desc,
513 const struct usb_ss_ep_comp_descriptor *comp_desc,
514 bool ignore, bool restore)
516 struct dwc3 *dwc = dep->dwc;
520 dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
522 if (!(dep->flags & DWC3_EP_ENABLED)) {
523 ret = dwc3_gadget_start_config(dwc, dep);
528 ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
533 if (!(dep->flags & DWC3_EP_ENABLED)) {
534 struct dwc3_trb *trb_st_hw;
535 struct dwc3_trb *trb_link;
537 ret = dwc3_gadget_set_xfer_resource(dwc, dep);
541 dep->endpoint.desc = desc;
542 dep->comp_desc = comp_desc;
543 dep->type = usb_endpoint_type(desc);
544 dep->flags |= DWC3_EP_ENABLED;
546 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
547 reg |= DWC3_DALEPENA_EP(dep->number);
548 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
550 if (!usb_endpoint_xfer_isoc(desc))
553 memset(&trb_link, 0, sizeof(trb_link));
555 /* Link TRB for ISOC. The HWO bit is never reset */
556 trb_st_hw = &dep->trb_pool[0];
558 trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
560 trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
561 trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
562 trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
563 trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
569 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
570 static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
572 struct dwc3_request *req;
574 if (!list_empty(&dep->req_queued)) {
575 dwc3_stop_active_transfer(dwc, dep->number, true);
577 /* - giveback all requests to gadget driver */
578 while (!list_empty(&dep->req_queued)) {
579 req = next_request(&dep->req_queued);
581 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
585 while (!list_empty(&dep->request_list)) {
586 req = next_request(&dep->request_list);
588 dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
593 * __dwc3_gadget_ep_disable - Disables a HW endpoint
594 * @dep: the endpoint to disable
596 * This function also removes requests which are currently processed ny the
597 * hardware and those which are not yet scheduled.
598 * Caller should take care of locking.
600 static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
602 struct dwc3 *dwc = dep->dwc;
605 dwc3_remove_requests(dwc, dep);
607 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
608 reg &= ~DWC3_DALEPENA_EP(dep->number);
609 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
611 dep->stream_capable = false;
612 dep->endpoint.desc = NULL;
613 dep->comp_desc = NULL;
620 /* -------------------------------------------------------------------------- */
622 static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
623 const struct usb_endpoint_descriptor *desc)
628 static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
633 /* -------------------------------------------------------------------------- */
635 static int dwc3_gadget_ep_enable(struct usb_ep *ep,
636 const struct usb_endpoint_descriptor *desc)
643 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
644 pr_debug("dwc3: invalid parameters\n");
648 if (!desc->wMaxPacketSize) {
649 pr_debug("dwc3: missing wMaxPacketSize\n");
653 dep = to_dwc3_ep(ep);
656 if (dep->flags & DWC3_EP_ENABLED) {
657 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
662 switch (usb_endpoint_type(desc)) {
663 case USB_ENDPOINT_XFER_CONTROL:
664 strlcat(dep->name, "-control", sizeof(dep->name));
666 case USB_ENDPOINT_XFER_ISOC:
667 strlcat(dep->name, "-isoc", sizeof(dep->name));
669 case USB_ENDPOINT_XFER_BULK:
670 strlcat(dep->name, "-bulk", sizeof(dep->name));
672 case USB_ENDPOINT_XFER_INT:
673 strlcat(dep->name, "-int", sizeof(dep->name));
676 dev_err(dwc->dev, "invalid endpoint transfer type\n");
679 spin_lock_irqsave(&dwc->lock, flags);
680 ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
681 spin_unlock_irqrestore(&dwc->lock, flags);
686 static int dwc3_gadget_ep_disable(struct usb_ep *ep)
694 pr_debug("dwc3: invalid parameters\n");
698 dep = to_dwc3_ep(ep);
701 if (!(dep->flags & DWC3_EP_ENABLED)) {
702 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
707 snprintf(dep->name, sizeof(dep->name), "ep%d%s",
709 (dep->number & 1) ? "in" : "out");
711 spin_lock_irqsave(&dwc->lock, flags);
712 ret = __dwc3_gadget_ep_disable(dep);
713 spin_unlock_irqrestore(&dwc->lock, flags);
718 static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
721 struct dwc3_request *req;
722 struct dwc3_ep *dep = to_dwc3_ep(ep);
723 struct dwc3 *dwc = dep->dwc;
725 req = kzalloc(sizeof(*req), gfp_flags);
727 dev_err(dwc->dev, "not enough memory\n");
731 req->epnum = dep->number;
734 return &req->request;
737 static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
738 struct usb_request *request)
740 struct dwc3_request *req = to_dwc3_request(request);
746 * dwc3_prepare_one_trb - setup one TRB from one request
747 * @dep: endpoint for which this request is prepared
748 * @req: dwc3_request pointer
750 static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
751 struct dwc3_request *req, dma_addr_t dma,
752 unsigned length, unsigned last, unsigned chain, unsigned node)
754 struct dwc3 *dwc = dep->dwc;
755 struct dwc3_trb *trb;
757 dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
758 dep->name, req, (unsigned long long) dma,
759 length, last ? " last" : "",
760 chain ? " chain" : "");
762 /* Skip the LINK-TRB on ISOC */
763 if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
764 usb_endpoint_xfer_isoc(dep->endpoint.desc))
767 trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
770 dwc3_gadget_move_request_queued(req);
772 req->trb_dma = dwc3_trb_dma_offset(dep, trb);
773 req->start_slot = dep->free_slot & DWC3_TRB_MASK;
778 trb->size = DWC3_TRB_SIZE_LENGTH(length);
779 trb->bpl = lower_32_bits(dma);
780 trb->bph = upper_32_bits(dma);
782 switch (usb_endpoint_type(dep->endpoint.desc)) {
783 case USB_ENDPOINT_XFER_CONTROL:
784 trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
787 case USB_ENDPOINT_XFER_ISOC:
789 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
791 trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
794 case USB_ENDPOINT_XFER_BULK:
795 case USB_ENDPOINT_XFER_INT:
796 trb->ctrl = DWC3_TRBCTL_NORMAL;
800 * This is only possible with faulty memory because we
801 * checked it already :)
806 if (!req->request.no_interrupt && !chain)
807 trb->ctrl |= DWC3_TRB_CTRL_IOC;
809 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
810 trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
811 trb->ctrl |= DWC3_TRB_CTRL_CSP;
813 trb->ctrl |= DWC3_TRB_CTRL_LST;
817 trb->ctrl |= DWC3_TRB_CTRL_CHN;
819 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
820 trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
822 trb->ctrl |= DWC3_TRB_CTRL_HWO;
826 * dwc3_prepare_trbs - setup TRBs from requests
827 * @dep: endpoint for which requests are being prepared
828 * @starting: true if the endpoint is idle and no requests are queued.
830 * The function goes through the requests list and sets up TRBs for the
831 * transfers. The function returns once there are no more TRBs available or
832 * it runs out of requests.
834 static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
836 struct dwc3_request *req, *n;
839 unsigned int last_one = 0;
841 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
843 /* the first request must not be queued */
844 trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
846 /* Can't wrap around on a non-isoc EP since there's no link TRB */
847 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
848 max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
854 * If busy & slot are equal than it is either full or empty. If we are
855 * starting to process requests then we are empty. Otherwise we are
856 * full and don't do anything
861 trbs_left = DWC3_TRB_NUM;
863 * In case we start from scratch, we queue the ISOC requests
864 * starting from slot 1. This is done because we use ring
865 * buffer and have no LST bit to stop us. Instead, we place
866 * IOC bit every TRB_NUM/4. We try to avoid having an interrupt
867 * after the first request so we start at slot 1 and have
868 * 7 requests proceed before we hit the first IOC.
869 * Other transfer types don't use the ring buffer and are
870 * processed from the first TRB until the last one. Since we
871 * don't wrap around we have to start at the beginning.
873 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
882 /* The last TRB is a link TRB, not used for xfer */
883 if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
886 list_for_each_entry_safe(req, n, &dep->request_list, list) {
891 if (req->request.num_mapped_sgs > 0) {
892 struct usb_request *request = &req->request;
893 struct scatterlist *sg = request->sg;
894 struct scatterlist *s;
897 for_each_sg(sg, s, request->num_mapped_sgs, i) {
898 unsigned chain = true;
900 length = sg_dma_len(s);
901 dma = sg_dma_address(s);
903 if (i == (request->num_mapped_sgs - 1) ||
905 if (list_is_last(&req->list,
918 dwc3_prepare_one_trb(dep, req, dma, length,
925 dma = req->request.dma;
926 length = req->request.length;
932 /* Is this the last request? */
933 if (list_is_last(&req->list, &dep->request_list))
936 dwc3_prepare_one_trb(dep, req, dma, length,
945 static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
948 struct dwc3_gadget_ep_cmd_params params;
949 struct dwc3_request *req;
950 struct dwc3 *dwc = dep->dwc;
954 if (start_new && (dep->flags & DWC3_EP_BUSY)) {
955 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name);
958 dep->flags &= ~DWC3_EP_PENDING_REQUEST;
961 * If we are getting here after a short-out-packet we don't enqueue any
962 * new requests as we try to set the IOC bit only on the last request.
965 if (list_empty(&dep->req_queued))
966 dwc3_prepare_trbs(dep, start_new);
968 /* req points to the first request which will be sent */
969 req = next_request(&dep->req_queued);
971 dwc3_prepare_trbs(dep, start_new);
974 * req points to the first request where HWO changed from 0 to 1
976 req = next_request(&dep->req_queued);
979 dep->flags |= DWC3_EP_PENDING_REQUEST;
983 memset(¶ms, 0, sizeof(params));
986 params.param0 = upper_32_bits(req->trb_dma);
987 params.param1 = lower_32_bits(req->trb_dma);
988 cmd = DWC3_DEPCMD_STARTTRANSFER;
990 cmd = DWC3_DEPCMD_UPDATETRANSFER;
993 cmd |= DWC3_DEPCMD_PARAM(cmd_param);
994 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
996 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
999 * FIXME we need to iterate over the list of requests
1000 * here and stop, unmap, free and del each of the linked
1001 * requests instead of what we do now.
1003 usb_gadget_unmap_request(&dwc->gadget, &req->request,
1005 list_del(&req->list);
1009 dep->flags |= DWC3_EP_BUSY;
1012 dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
1014 WARN_ON_ONCE(!dep->resource_index);
1020 static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
1021 struct dwc3_ep *dep, u32 cur_uf)
1025 if (list_empty(&dep->request_list)) {
1026 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
1028 dep->flags |= DWC3_EP_PENDING_REQUEST;
1032 /* 4 micro frames in the future */
1033 uf = cur_uf + dep->interval * 4;
1035 __dwc3_gadget_kick_transfer(dep, uf, 1);
1038 static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
1039 struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
1043 mask = ~(dep->interval - 1);
1044 cur_uf = event->parameters & mask;
1046 __dwc3_gadget_start_isoc(dwc, dep, cur_uf);
1049 static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
1051 struct dwc3 *dwc = dep->dwc;
1054 req->request.actual = 0;
1055 req->request.status = -EINPROGRESS;
1056 req->direction = dep->direction;
1057 req->epnum = dep->number;
1060 * We only add to our list of requests now and
1061 * start consuming the list once we get XferNotReady
1064 * That way, we avoid doing anything that we don't need
1065 * to do now and defer it until the point we receive a
1066 * particular token from the Host side.
1068 * This will also avoid Host cancelling URBs due to too
1071 ret = usb_gadget_map_request(&dwc->gadget, &req->request,
1076 list_add_tail(&req->list, &dep->request_list);
1079 * There are a few special cases:
1081 * 1. XferNotReady with empty list of requests. We need to kick the
1082 * transfer here in that situation, otherwise we will be NAKing
1083 * forever. If we get XferNotReady before gadget driver has a
1084 * chance to queue a request, we will ACK the IRQ but won't be
1085 * able to receive the data until the next request is queued.
1086 * The following code is handling exactly that.
1089 if (dep->flags & DWC3_EP_PENDING_REQUEST) {
1091 * If xfernotready is already elapsed and it is a case
1092 * of isoc transfer, then issue END TRANSFER, so that
1093 * you can receive xfernotready again and can have
1094 * notion of current microframe.
1096 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1097 if (list_empty(&dep->req_queued)) {
1098 dwc3_stop_active_transfer(dwc, dep->number, true);
1099 dep->flags = DWC3_EP_ENABLED;
1104 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1105 if (ret && ret != -EBUSY)
1106 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1112 * 2. XferInProgress on Isoc EP with an active transfer. We need to
1113 * kick the transfer here after queuing a request, otherwise the
1114 * core may not see the modified TRB(s).
1116 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1117 (dep->flags & DWC3_EP_BUSY) &&
1118 !(dep->flags & DWC3_EP_MISSED_ISOC)) {
1119 WARN_ON_ONCE(!dep->resource_index);
1120 ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
1122 if (ret && ret != -EBUSY)
1123 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1129 * 4. Stream Capable Bulk Endpoints. We need to start the transfer
1130 * right away, otherwise host will not know we have streams to be
1133 if (dep->stream_capable) {
1136 ret = __dwc3_gadget_kick_transfer(dep, 0, true);
1137 if (ret && ret != -EBUSY) {
1138 struct dwc3 *dwc = dep->dwc;
1140 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
1148 static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
1151 struct dwc3_request *req = to_dwc3_request(request);
1152 struct dwc3_ep *dep = to_dwc3_ep(ep);
1153 struct dwc3 *dwc = dep->dwc;
1155 unsigned long flags;
1159 if (!dep->endpoint.desc) {
1160 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
1165 dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
1166 request, ep->name, request->length);
1168 spin_lock_irqsave(&dwc->lock, flags);
1169 ret = __dwc3_gadget_ep_queue(dep, req);
1170 spin_unlock_irqrestore(&dwc->lock, flags);
1175 static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
1176 struct usb_request *request)
1178 struct dwc3_request *req = to_dwc3_request(request);
1179 struct dwc3_request *r = NULL;
1181 struct dwc3_ep *dep = to_dwc3_ep(ep);
1182 struct dwc3 *dwc = dep->dwc;
1184 unsigned long flags;
1187 spin_lock_irqsave(&dwc->lock, flags);
1189 list_for_each_entry(r, &dep->request_list, list) {
1195 list_for_each_entry(r, &dep->req_queued, list) {
1200 /* wait until it is processed */
1201 dwc3_stop_active_transfer(dwc, dep->number, true);
1204 dev_err(dwc->dev, "request %p was not queued to %s\n",
1211 /* giveback the request */
1212 dwc3_gadget_giveback(dep, req, -ECONNRESET);
1215 spin_unlock_irqrestore(&dwc->lock, flags);
1220 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
1222 struct dwc3_gadget_ep_cmd_params params;
1223 struct dwc3 *dwc = dep->dwc;
1226 memset(¶ms, 0x00, sizeof(params));
1229 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1230 DWC3_DEPCMD_SETSTALL, ¶ms);
1232 dev_err(dwc->dev, "failed to set STALL on %s\n",
1235 dep->flags |= DWC3_EP_STALL;
1237 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
1238 DWC3_DEPCMD_CLEARSTALL, ¶ms);
1240 dev_err(dwc->dev, "failed to clear STALL on %s\n",
1243 dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
1249 static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
1251 struct dwc3_ep *dep = to_dwc3_ep(ep);
1252 struct dwc3 *dwc = dep->dwc;
1254 unsigned long flags;
1258 spin_lock_irqsave(&dwc->lock, flags);
1260 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1261 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
1266 ret = __dwc3_gadget_ep_set_halt(dep, value);
1268 spin_unlock_irqrestore(&dwc->lock, flags);
1273 static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
1275 struct dwc3_ep *dep = to_dwc3_ep(ep);
1276 struct dwc3 *dwc = dep->dwc;
1277 unsigned long flags;
1279 spin_lock_irqsave(&dwc->lock, flags);
1280 dep->flags |= DWC3_EP_WEDGE;
1281 spin_unlock_irqrestore(&dwc->lock, flags);
1283 if (dep->number == 0 || dep->number == 1)
1284 return dwc3_gadget_ep0_set_halt(ep, 1);
1286 return dwc3_gadget_ep_set_halt(ep, 1);
1289 /* -------------------------------------------------------------------------- */
1291 static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
1292 .bLength = USB_DT_ENDPOINT_SIZE,
1293 .bDescriptorType = USB_DT_ENDPOINT,
1294 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1297 static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
1298 .enable = dwc3_gadget_ep0_enable,
1299 .disable = dwc3_gadget_ep0_disable,
1300 .alloc_request = dwc3_gadget_ep_alloc_request,
1301 .free_request = dwc3_gadget_ep_free_request,
1302 .queue = dwc3_gadget_ep0_queue,
1303 .dequeue = dwc3_gadget_ep_dequeue,
1304 .set_halt = dwc3_gadget_ep0_set_halt,
1305 .set_wedge = dwc3_gadget_ep_set_wedge,
1308 static const struct usb_ep_ops dwc3_gadget_ep_ops = {
1309 .enable = dwc3_gadget_ep_enable,
1310 .disable = dwc3_gadget_ep_disable,
1311 .alloc_request = dwc3_gadget_ep_alloc_request,
1312 .free_request = dwc3_gadget_ep_free_request,
1313 .queue = dwc3_gadget_ep_queue,
1314 .dequeue = dwc3_gadget_ep_dequeue,
1315 .set_halt = dwc3_gadget_ep_set_halt,
1316 .set_wedge = dwc3_gadget_ep_set_wedge,
1319 /* -------------------------------------------------------------------------- */
1321 static int dwc3_gadget_get_frame(struct usb_gadget *g)
1323 struct dwc3 *dwc = gadget_to_dwc(g);
1326 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1327 return DWC3_DSTS_SOFFN(reg);
1330 static int dwc3_gadget_wakeup(struct usb_gadget *g)
1332 struct dwc3 *dwc = gadget_to_dwc(g);
1334 unsigned long timeout;
1335 unsigned long flags;
1344 spin_lock_irqsave(&dwc->lock, flags);
1347 * According to the Databook Remote wakeup request should
1348 * be issued only when the device is in early suspend state.
1350 * We can check that via USB Link State bits in DSTS register.
1352 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1354 speed = reg & DWC3_DSTS_CONNECTSPD;
1355 if (speed == DWC3_DSTS_SUPERSPEED) {
1356 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n");
1361 link_state = DWC3_DSTS_USBLNKST(reg);
1363 switch (link_state) {
1364 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
1365 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
1368 dev_dbg(dwc->dev, "can't wakeup from link state %d\n",
1374 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
1376 dev_err(dwc->dev, "failed to put link in Recovery\n");
1380 /* Recent versions do this automatically */
1381 if (dwc->revision < DWC3_REVISION_194A) {
1382 /* write zeroes to Link Change Request */
1383 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1384 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
1385 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1388 /* poll until Link State changes to ON */
1389 timeout = jiffies + msecs_to_jiffies(100);
1391 while (!time_after(jiffies, timeout)) {
1392 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1394 /* in HS, means ON */
1395 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
1399 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
1400 dev_err(dwc->dev, "failed to send remote wakeup\n");
1405 spin_unlock_irqrestore(&dwc->lock, flags);
1410 static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
1413 struct dwc3 *dwc = gadget_to_dwc(g);
1414 unsigned long flags;
1416 spin_lock_irqsave(&dwc->lock, flags);
1417 dwc->is_selfpowered = !!is_selfpowered;
1418 spin_unlock_irqrestore(&dwc->lock, flags);
1423 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
1428 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1430 if (dwc->revision <= DWC3_REVISION_187A) {
1431 reg &= ~DWC3_DCTL_TRGTULST_MASK;
1432 reg |= DWC3_DCTL_TRGTULST_RX_DET;
1435 if (dwc->revision >= DWC3_REVISION_194A)
1436 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1437 reg |= DWC3_DCTL_RUN_STOP;
1439 if (dwc->has_hibernation)
1440 reg |= DWC3_DCTL_KEEP_CONNECT;
1442 dwc->pullups_connected = true;
1444 reg &= ~DWC3_DCTL_RUN_STOP;
1446 if (dwc->has_hibernation && !suspend)
1447 reg &= ~DWC3_DCTL_KEEP_CONNECT;
1449 dwc->pullups_connected = false;
1452 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1455 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
1457 if (!(reg & DWC3_DSTS_DEVCTRLHLT))
1460 if (reg & DWC3_DSTS_DEVCTRLHLT)
1469 dev_vdbg(dwc->dev, "gadget %s data soft-%s\n",
1471 ? dwc->gadget_driver->function : "no-function",
1472 is_on ? "connect" : "disconnect");
1477 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
1479 struct dwc3 *dwc = gadget_to_dwc(g);
1480 unsigned long flags;
1485 spin_lock_irqsave(&dwc->lock, flags);
1486 ret = dwc3_gadget_run_stop(dwc, is_on, false);
1487 spin_unlock_irqrestore(&dwc->lock, flags);
1492 static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
1496 /* Enable all but Start and End of Frame IRQs */
1497 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
1498 DWC3_DEVTEN_EVNTOVERFLOWEN |
1499 DWC3_DEVTEN_CMDCMPLTEN |
1500 DWC3_DEVTEN_ERRTICERREN |
1501 DWC3_DEVTEN_WKUPEVTEN |
1502 DWC3_DEVTEN_ULSTCNGEN |
1503 DWC3_DEVTEN_CONNECTDONEEN |
1504 DWC3_DEVTEN_USBRSTEN |
1505 DWC3_DEVTEN_DISCONNEVTEN);
1507 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
1510 static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
1512 /* mask all interrupts */
1513 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
1516 static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
1517 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
1519 static int dwc3_gadget_start(struct usb_gadget *g,
1520 struct usb_gadget_driver *driver)
1522 struct dwc3 *dwc = gadget_to_dwc(g);
1523 struct dwc3_ep *dep;
1524 unsigned long flags;
1529 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1530 ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
1531 IRQF_SHARED, "dwc3", dwc);
1533 dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
1538 spin_lock_irqsave(&dwc->lock, flags);
1540 if (dwc->gadget_driver) {
1541 dev_err(dwc->dev, "%s is already bound to %s\n",
1543 dwc->gadget_driver->driver.name);
1548 dwc->gadget_driver = driver;
1550 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
1551 reg &= ~(DWC3_DCFG_SPEED_MASK);
1554 * WORKAROUND: DWC3 revision < 2.20a have an issue
1555 * which would cause metastability state on Run/Stop
1556 * bit if we try to force the IP to USB2-only mode.
1558 * Because of that, we cannot configure the IP to any
1559 * speed other than the SuperSpeed
1563 * STAR#9000525659: Clock Domain Crossing on DCTL in
1566 if (dwc->revision < DWC3_REVISION_220A) {
1567 reg |= DWC3_DCFG_SUPERSPEED;
1569 switch (dwc->maximum_speed) {
1571 reg |= DWC3_DSTS_LOWSPEED;
1573 case USB_SPEED_FULL:
1574 reg |= DWC3_DSTS_FULLSPEED1;
1576 case USB_SPEED_HIGH:
1577 reg |= DWC3_DSTS_HIGHSPEED;
1579 case USB_SPEED_SUPER: /* FALLTHROUGH */
1580 case USB_SPEED_UNKNOWN: /* FALTHROUGH */
1582 reg |= DWC3_DSTS_SUPERSPEED;
1585 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
1587 dwc->start_config_issued = false;
1589 /* Start with SuperSpeed Default */
1590 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
1593 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1596 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1601 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
1604 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
1608 /* begin to receive SETUP packets */
1609 dwc->ep0state = EP0_SETUP_PHASE;
1610 dwc3_ep0_out_start(dwc);
1612 dwc3_gadget_enable_irq(dwc);
1614 spin_unlock_irqrestore(&dwc->lock, flags);
1619 __dwc3_gadget_ep_disable(dwc->eps[0]);
1622 dwc->gadget_driver = NULL;
1625 spin_unlock_irqrestore(&dwc->lock, flags);
1633 static int dwc3_gadget_stop(struct usb_gadget *g,
1634 struct usb_gadget_driver *driver)
1636 struct dwc3 *dwc = gadget_to_dwc(g);
1637 unsigned long flags;
1640 spin_lock_irqsave(&dwc->lock, flags);
1642 dwc3_gadget_disable_irq(dwc);
1643 __dwc3_gadget_ep_disable(dwc->eps[0]);
1644 __dwc3_gadget_ep_disable(dwc->eps[1]);
1646 dwc->gadget_driver = NULL;
1648 spin_unlock_irqrestore(&dwc->lock, flags);
1650 irq = platform_get_irq(to_platform_device(dwc->dev), 0);
1656 static const struct usb_gadget_ops dwc3_gadget_ops = {
1657 .get_frame = dwc3_gadget_get_frame,
1658 .wakeup = dwc3_gadget_wakeup,
1659 .set_selfpowered = dwc3_gadget_set_selfpowered,
1660 .pullup = dwc3_gadget_pullup,
1661 .udc_start = dwc3_gadget_start,
1662 .udc_stop = dwc3_gadget_stop,
1665 /* -------------------------------------------------------------------------- */
1667 static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
1668 u8 num, u32 direction)
1670 struct dwc3_ep *dep;
1673 for (i = 0; i < num; i++) {
1674 u8 epnum = (i << 1) | (!!direction);
1676 dep = kzalloc(sizeof(*dep), GFP_KERNEL);
1678 dev_err(dwc->dev, "can't allocate endpoint %d\n",
1684 dep->number = epnum;
1685 dep->direction = !!direction;
1686 dwc->eps[epnum] = dep;
1688 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
1689 (epnum & 1) ? "in" : "out");
1691 dep->endpoint.name = dep->name;
1693 dev_vdbg(dwc->dev, "initializing %s\n", dep->name);
1695 if (epnum == 0 || epnum == 1) {
1696 usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
1697 dep->endpoint.maxburst = 1;
1698 dep->endpoint.ops = &dwc3_gadget_ep0_ops;
1700 dwc->gadget.ep0 = &dep->endpoint;
1704 usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
1705 dep->endpoint.max_streams = 15;
1706 dep->endpoint.ops = &dwc3_gadget_ep_ops;
1707 list_add_tail(&dep->endpoint.ep_list,
1708 &dwc->gadget.ep_list);
1710 ret = dwc3_alloc_trb_pool(dep);
1715 INIT_LIST_HEAD(&dep->request_list);
1716 INIT_LIST_HEAD(&dep->req_queued);
1722 static int dwc3_gadget_init_endpoints(struct dwc3 *dwc)
1726 INIT_LIST_HEAD(&dwc->gadget.ep_list);
1728 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
1730 dev_vdbg(dwc->dev, "failed to allocate OUT endpoints\n");
1734 ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
1736 dev_vdbg(dwc->dev, "failed to allocate IN endpoints\n");
1743 static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
1745 struct dwc3_ep *dep;
1748 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
1749 dep = dwc->eps[epnum];
1753 * Physical endpoints 0 and 1 are special; they form the
1754 * bi-directional USB endpoint 0.
1756 * For those two physical endpoints, we don't allocate a TRB
1757 * pool nor do we add them the endpoints list. Due to that, we
1758 * shouldn't do these two operations otherwise we would end up
1759 * with all sorts of bugs when removing dwc3.ko.
1761 if (epnum != 0 && epnum != 1) {
1762 dwc3_free_trb_pool(dep);
1763 list_del(&dep->endpoint.ep_list);
1770 /* -------------------------------------------------------------------------- */
1772 static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
1773 struct dwc3_request *req, struct dwc3_trb *trb,
1774 const struct dwc3_event_depevt *event, int status)
1777 unsigned int s_pkt = 0;
1778 unsigned int trb_status;
1780 if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
1782 * We continue despite the error. There is not much we
1783 * can do. If we don't clean it up we loop forever. If
1784 * we skip the TRB then it gets overwritten after a
1785 * while since we use them in a ring buffer. A BUG()
1786 * would help. Lets hope that if this occurs, someone
1787 * fixes the root cause instead of looking away :)
1789 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
1791 count = trb->size & DWC3_TRB_SIZE_MASK;
1793 if (dep->direction) {
1795 trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
1796 if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
1797 dev_dbg(dwc->dev, "incomplete IN transfer %s\n",
1800 * If missed isoc occurred and there is
1801 * no request queued then issue END
1802 * TRANSFER, so that core generates
1803 * next xfernotready and we will issue
1804 * a fresh START TRANSFER.
1805 * If there are still queued request
1806 * then wait, do not issue either END
1807 * or UPDATE TRANSFER, just attach next
1808 * request in request_list during
1809 * giveback.If any future queued request
1810 * is successfully transferred then we
1811 * will issue UPDATE TRANSFER for all
1812 * request in the request_list.
1814 dep->flags |= DWC3_EP_MISSED_ISOC;
1816 dev_err(dwc->dev, "incomplete IN transfer %s\n",
1818 status = -ECONNRESET;
1821 dep->flags &= ~DWC3_EP_MISSED_ISOC;
1824 if (count && (event->status & DEPEVT_STATUS_SHORT))
1829 * We assume here we will always receive the entire data block
1830 * which we should receive. Meaning, if we program RX to
1831 * receive 4K but we receive only 2K, we assume that's all we
1832 * should receive and we simply bounce the request back to the
1833 * gadget driver for further processing.
1835 req->request.actual += req->request.length - count;
1838 if ((event->status & DEPEVT_STATUS_LST) &&
1839 (trb->ctrl & (DWC3_TRB_CTRL_LST |
1840 DWC3_TRB_CTRL_HWO)))
1842 if ((event->status & DEPEVT_STATUS_IOC) &&
1843 (trb->ctrl & DWC3_TRB_CTRL_IOC))
1848 static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
1849 const struct dwc3_event_depevt *event, int status)
1851 struct dwc3_request *req;
1852 struct dwc3_trb *trb;
1858 req = next_request(&dep->req_queued);
1865 slot = req->start_slot + i;
1866 if ((slot == DWC3_TRB_NUM - 1) &&
1867 usb_endpoint_xfer_isoc(dep->endpoint.desc))
1869 slot %= DWC3_TRB_NUM;
1870 trb = &dep->trb_pool[slot];
1872 ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
1876 }while (++i < req->request.num_mapped_sgs);
1878 dwc3_gadget_giveback(dep, req, status);
1884 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
1885 list_empty(&dep->req_queued)) {
1886 if (list_empty(&dep->request_list)) {
1888 * If there is no entry in request list then do
1889 * not issue END TRANSFER now. Just set PENDING
1890 * flag, so that END TRANSFER is issued when an
1891 * entry is added into request list.
1893 dep->flags = DWC3_EP_PENDING_REQUEST;
1895 dwc3_stop_active_transfer(dwc, dep->number, true);
1896 dep->flags = DWC3_EP_ENABLED;
1904 static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
1905 struct dwc3_ep *dep, const struct dwc3_event_depevt *event,
1908 unsigned status = 0;
1911 if (event->status & DEPEVT_STATUS_BUSERR)
1912 status = -ECONNRESET;
1914 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
1916 dep->flags &= ~DWC3_EP_BUSY;
1919 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
1920 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
1922 if (dwc->revision < DWC3_REVISION_183A) {
1926 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
1929 if (!(dep->flags & DWC3_EP_ENABLED))
1932 if (!list_empty(&dep->req_queued))
1936 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
1938 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
1944 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
1945 const struct dwc3_event_depevt *event)
1947 struct dwc3_ep *dep;
1948 u8 epnum = event->endpoint_number;
1950 dep = dwc->eps[epnum];
1952 if (!(dep->flags & DWC3_EP_ENABLED))
1955 dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
1956 dwc3_ep_event_string(event->endpoint_event));
1958 if (epnum == 0 || epnum == 1) {
1959 dwc3_ep0_interrupt(dwc, event);
1963 switch (event->endpoint_event) {
1964 case DWC3_DEPEVT_XFERCOMPLETE:
1965 dep->resource_index = 0;
1967 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1968 dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n",
1973 dwc3_endpoint_transfer_complete(dwc, dep, event, 1);
1975 case DWC3_DEPEVT_XFERINPROGRESS:
1976 if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1977 dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n",
1982 dwc3_endpoint_transfer_complete(dwc, dep, event, 0);
1984 case DWC3_DEPEVT_XFERNOTREADY:
1985 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
1986 dwc3_gadget_start_isoc(dwc, dep, event);
1990 dev_vdbg(dwc->dev, "%s: reason %s\n",
1991 dep->name, event->status &
1992 DEPEVT_STATUS_TRANSFER_ACTIVE
1994 : "Transfer Not Active");
1996 ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
1997 if (!ret || ret == -EBUSY)
2000 dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
2005 case DWC3_DEPEVT_STREAMEVT:
2006 if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
2007 dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
2012 switch (event->status) {
2013 case DEPEVT_STREAMEVT_FOUND:
2014 dev_vdbg(dwc->dev, "Stream %d found and started\n",
2018 case DEPEVT_STREAMEVT_NOTFOUND:
2021 dev_dbg(dwc->dev, "Couldn't find suitable stream\n");
2024 case DWC3_DEPEVT_RXTXFIFOEVT:
2025 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name);
2027 case DWC3_DEPEVT_EPCMDCMPLT:
2028 dev_vdbg(dwc->dev, "Endpoint Command Complete\n");
2033 static void dwc3_disconnect_gadget(struct dwc3 *dwc)
2035 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
2036 spin_unlock(&dwc->lock);
2037 dwc->gadget_driver->disconnect(&dwc->gadget);
2038 spin_lock(&dwc->lock);
2042 static void dwc3_suspend_gadget(struct dwc3 *dwc)
2044 if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
2045 spin_unlock(&dwc->lock);
2046 dwc->gadget_driver->suspend(&dwc->gadget);
2047 spin_lock(&dwc->lock);
2051 static void dwc3_resume_gadget(struct dwc3 *dwc)
2053 if (dwc->gadget_driver && dwc->gadget_driver->resume) {
2054 spin_unlock(&dwc->lock);
2055 dwc->gadget_driver->resume(&dwc->gadget);
2056 spin_lock(&dwc->lock);
2060 static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force)
2062 struct dwc3_ep *dep;
2063 struct dwc3_gadget_ep_cmd_params params;
2067 dep = dwc->eps[epnum];
2069 if (!dep->resource_index)
2073 * NOTICE: We are violating what the Databook says about the
2074 * EndTransfer command. Ideally we would _always_ wait for the
2075 * EndTransfer Command Completion IRQ, but that's causing too
2076 * much trouble synchronizing between us and gadget driver.
2078 * We have discussed this with the IP Provider and it was
2079 * suggested to giveback all requests here, but give HW some
2080 * extra time to synchronize with the interconnect. We're using
2081 * an arbitraty 100us delay for that.
2083 * Note also that a similar handling was tested by Synopsys
2084 * (thanks a lot Paul) and nothing bad has come out of it.
2085 * In short, what we're doing is:
2087 * - Issue EndTransfer WITH CMDIOC bit set
2091 cmd = DWC3_DEPCMD_ENDTRANSFER;
2092 cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
2093 cmd |= DWC3_DEPCMD_CMDIOC;
2094 cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
2095 memset(¶ms, 0, sizeof(params));
2096 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms);
2098 dep->resource_index = 0;
2099 dep->flags &= ~DWC3_EP_BUSY;
2103 static void dwc3_stop_active_transfers(struct dwc3 *dwc)
2107 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2108 struct dwc3_ep *dep;
2110 dep = dwc->eps[epnum];
2114 if (!(dep->flags & DWC3_EP_ENABLED))
2117 dwc3_remove_requests(dwc, dep);
2121 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
2125 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
2126 struct dwc3_ep *dep;
2127 struct dwc3_gadget_ep_cmd_params params;
2130 dep = dwc->eps[epnum];
2134 if (!(dep->flags & DWC3_EP_STALL))
2137 dep->flags &= ~DWC3_EP_STALL;
2139 memset(¶ms, 0, sizeof(params));
2140 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
2141 DWC3_DEPCMD_CLEARSTALL, ¶ms);
2146 static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
2150 dev_vdbg(dwc->dev, "%s\n", __func__);
2152 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2153 reg &= ~DWC3_DCTL_INITU1ENA;
2154 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2156 reg &= ~DWC3_DCTL_INITU2ENA;
2157 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2159 dwc3_disconnect_gadget(dwc);
2160 dwc->start_config_issued = false;
2162 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2163 dwc->setup_packet_pending = false;
2166 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
2170 dev_vdbg(dwc->dev, "%s\n", __func__);
2173 * WORKAROUND: DWC3 revisions <1.88a have an issue which
2174 * would cause a missing Disconnect Event if there's a
2175 * pending Setup Packet in the FIFO.
2177 * There's no suggested workaround on the official Bug
2178 * report, which states that "unless the driver/application
2179 * is doing any special handling of a disconnect event,
2180 * there is no functional issue".
2182 * Unfortunately, it turns out that we _do_ some special
2183 * handling of a disconnect event, namely complete all
2184 * pending transfers, notify gadget driver of the
2185 * disconnection, and so on.
2187 * Our suggested workaround is to follow the Disconnect
2188 * Event steps here, instead, based on a setup_packet_pending
2189 * flag. Such flag gets set whenever we have a XferNotReady
2190 * event on EP0 and gets cleared on XferComplete for the
2195 * STAR#9000466709: RTL: Device : Disconnect event not
2196 * generated if setup packet pending in FIFO
2198 if (dwc->revision < DWC3_REVISION_188A) {
2199 if (dwc->setup_packet_pending)
2200 dwc3_gadget_disconnect_interrupt(dwc);
2203 /* after reset -> Default State */
2204 usb_gadget_set_state(&dwc->gadget, USB_STATE_DEFAULT);
2206 if (dwc->gadget.speed != USB_SPEED_UNKNOWN)
2207 dwc3_disconnect_gadget(dwc);
2209 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2210 reg &= ~DWC3_DCTL_TSTCTRL_MASK;
2211 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2212 dwc->test_mode = false;
2214 dwc3_stop_active_transfers(dwc);
2215 dwc3_clear_stall_all_ep(dwc);
2216 dwc->start_config_issued = false;
2218 /* Reset device address to zero */
2219 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2220 reg &= ~(DWC3_DCFG_DEVADDR_MASK);
2221 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2224 static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
2227 u32 usb30_clock = DWC3_GCTL_CLK_BUS;
2230 * We change the clock only at SS but I dunno why I would want to do
2231 * this. Maybe it becomes part of the power saving plan.
2234 if (speed != DWC3_DSTS_SUPERSPEED)
2238 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
2239 * each time on Connect Done.
2244 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
2245 reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
2246 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
2249 static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
2251 struct dwc3_ep *dep;
2256 dev_vdbg(dwc->dev, "%s\n", __func__);
2258 reg = dwc3_readl(dwc->regs, DWC3_DSTS);
2259 speed = reg & DWC3_DSTS_CONNECTSPD;
2262 dwc3_update_ram_clk_sel(dwc, speed);
2265 case DWC3_DCFG_SUPERSPEED:
2267 * WORKAROUND: DWC3 revisions <1.90a have an issue which
2268 * would cause a missing USB3 Reset event.
2270 * In such situations, we should force a USB3 Reset
2271 * event by calling our dwc3_gadget_reset_interrupt()
2276 * STAR#9000483510: RTL: SS : USB3 reset event may
2277 * not be generated always when the link enters poll
2279 if (dwc->revision < DWC3_REVISION_190A)
2280 dwc3_gadget_reset_interrupt(dwc);
2282 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2283 dwc->gadget.ep0->maxpacket = 512;
2284 dwc->gadget.speed = USB_SPEED_SUPER;
2286 case DWC3_DCFG_HIGHSPEED:
2287 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2288 dwc->gadget.ep0->maxpacket = 64;
2289 dwc->gadget.speed = USB_SPEED_HIGH;
2291 case DWC3_DCFG_FULLSPEED2:
2292 case DWC3_DCFG_FULLSPEED1:
2293 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
2294 dwc->gadget.ep0->maxpacket = 64;
2295 dwc->gadget.speed = USB_SPEED_FULL;
2297 case DWC3_DCFG_LOWSPEED:
2298 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
2299 dwc->gadget.ep0->maxpacket = 8;
2300 dwc->gadget.speed = USB_SPEED_LOW;
2304 /* Enable USB2 LPM Capability */
2306 if ((dwc->revision > DWC3_REVISION_194A)
2307 && (speed != DWC3_DCFG_SUPERSPEED)) {
2308 reg = dwc3_readl(dwc->regs, DWC3_DCFG);
2309 reg |= DWC3_DCFG_LPM_CAP;
2310 dwc3_writel(dwc->regs, DWC3_DCFG, reg);
2312 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2313 reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
2316 * TODO: This should be configurable. For now using
2317 * maximum allowed HIRD threshold value of 0b1100
2319 reg |= DWC3_DCTL_HIRD_THRES(12);
2321 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2323 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2324 reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
2325 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2329 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2332 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2337 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true,
2340 dev_err(dwc->dev, "failed to enable %s\n", dep->name);
2345 * Configure PHY via GUSB3PIPECTLn if required.
2347 * Update GTXFIFOSIZn
2349 * In both cases reset values should be sufficient.
2353 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
2355 dev_vdbg(dwc->dev, "%s\n", __func__);
2358 * TODO take core out of low power mode when that's
2362 dwc->gadget_driver->resume(&dwc->gadget);
2365 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
2366 unsigned int evtinfo)
2368 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
2369 unsigned int pwropt;
2372 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
2373 * Hibernation mode enabled which would show up when device detects
2374 * host-initiated U3 exit.
2376 * In that case, device will generate a Link State Change Interrupt
2377 * from U3 to RESUME which is only necessary if Hibernation is
2380 * There are no functional changes due to such spurious event and we
2381 * just need to ignore it.
2385 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
2388 pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
2389 if ((dwc->revision < DWC3_REVISION_250A) &&
2390 (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
2391 if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
2392 (next == DWC3_LINK_STATE_RESUME)) {
2393 dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
2399 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
2400 * on the link partner, the USB session might do multiple entry/exit
2401 * of low power states before a transfer takes place.
2403 * Due to this problem, we might experience lower throughput. The
2404 * suggested workaround is to disable DCTL[12:9] bits if we're
2405 * transitioning from U1/U2 to U0 and enable those bits again
2406 * after a transfer completes and there are no pending transfers
2407 * on any of the enabled endpoints.
2409 * This is the first half of that workaround.
2413 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
2414 * core send LGO_Ux entering U0
2416 if (dwc->revision < DWC3_REVISION_183A) {
2417 if (next == DWC3_LINK_STATE_U0) {
2421 switch (dwc->link_state) {
2422 case DWC3_LINK_STATE_U1:
2423 case DWC3_LINK_STATE_U2:
2424 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
2425 u1u2 = reg & (DWC3_DCTL_INITU2ENA
2426 | DWC3_DCTL_ACCEPTU2ENA
2427 | DWC3_DCTL_INITU1ENA
2428 | DWC3_DCTL_ACCEPTU1ENA);
2431 dwc->u1u2 = reg & u1u2;
2435 dwc3_writel(dwc->regs, DWC3_DCTL, reg);
2444 dwc->link_state = next;
2447 case DWC3_LINK_STATE_U1:
2448 if (dwc->speed == USB_SPEED_SUPER)
2449 dwc3_suspend_gadget(dwc);
2451 case DWC3_LINK_STATE_U2:
2452 case DWC3_LINK_STATE_U3:
2453 dwc3_suspend_gadget(dwc);
2455 case DWC3_LINK_STATE_RESUME:
2456 dwc3_resume_gadget(dwc);
2463 dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
2466 static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
2467 unsigned int evtinfo)
2469 unsigned int is_ss = evtinfo & BIT(4);
2472 * WORKAROUND: DWC3 revison 2.20a with hibernation support
2473 * have a known issue which can cause USB CV TD.9.23 to fail
2476 * Because of this issue, core could generate bogus hibernation
2477 * events which SW needs to ignore.
2481 * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
2482 * Device Fallback from SuperSpeed
2484 if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
2487 /* enter hibernation here */
2490 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
2491 const struct dwc3_event_devt *event)
2493 switch (event->type) {
2494 case DWC3_DEVICE_EVENT_DISCONNECT:
2495 dwc3_gadget_disconnect_interrupt(dwc);
2497 case DWC3_DEVICE_EVENT_RESET:
2498 dwc3_gadget_reset_interrupt(dwc);
2500 case DWC3_DEVICE_EVENT_CONNECT_DONE:
2501 dwc3_gadget_conndone_interrupt(dwc);
2503 case DWC3_DEVICE_EVENT_WAKEUP:
2504 dwc3_gadget_wakeup_interrupt(dwc);
2506 case DWC3_DEVICE_EVENT_HIBER_REQ:
2507 if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
2508 "unexpected hibernation event\n"))
2511 dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
2513 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
2514 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
2516 case DWC3_DEVICE_EVENT_EOPF:
2517 dev_vdbg(dwc->dev, "End of Periodic Frame\n");
2519 case DWC3_DEVICE_EVENT_SOF:
2520 dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
2522 case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
2523 dev_vdbg(dwc->dev, "Erratic Error\n");
2525 case DWC3_DEVICE_EVENT_CMD_CMPL:
2526 dev_vdbg(dwc->dev, "Command Complete\n");
2528 case DWC3_DEVICE_EVENT_OVERFLOW:
2529 dev_vdbg(dwc->dev, "Overflow\n");
2532 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
2536 static void dwc3_process_event_entry(struct dwc3 *dwc,
2537 const union dwc3_event *event)
2539 /* Endpoint IRQ, handle it and return early */
2540 if (event->type.is_devspec == 0) {
2542 return dwc3_endpoint_interrupt(dwc, &event->depevt);
2545 switch (event->type.type) {
2546 case DWC3_EVENT_TYPE_DEV:
2547 dwc3_gadget_interrupt(dwc, &event->devt);
2549 /* REVISIT what to do with Carkit and I2C events ? */
2551 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
2555 static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
2557 struct dwc3_event_buffer *evt;
2558 irqreturn_t ret = IRQ_NONE;
2562 evt = dwc->ev_buffs[buf];
2565 if (!(evt->flags & DWC3_EVENT_PENDING))
2569 union dwc3_event event;
2571 event.raw = *(u32 *) (evt->buf + evt->lpos);
2573 dwc3_process_event_entry(dwc, &event);
2576 * FIXME we wrap around correctly to the next entry as
2577 * almost all entries are 4 bytes in size. There is one
2578 * entry which has 12 bytes which is a regular entry
2579 * followed by 8 bytes data. ATM I don't know how
2580 * things are organized if we get next to the a
2581 * boundary so I worry about that once we try to handle
2584 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE;
2587 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4);
2591 evt->flags &= ~DWC3_EVENT_PENDING;
2594 /* Unmask interrupt */
2595 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2596 reg &= ~DWC3_GEVNTSIZ_INTMASK;
2597 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2602 static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
2604 struct dwc3 *dwc = _dwc;
2605 unsigned long flags;
2606 irqreturn_t ret = IRQ_NONE;
2609 spin_lock_irqsave(&dwc->lock, flags);
2611 for (i = 0; i < dwc->num_event_buffers; i++)
2612 ret |= dwc3_process_event_buf(dwc, i);
2614 spin_unlock_irqrestore(&dwc->lock, flags);
2619 static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
2621 struct dwc3_event_buffer *evt;
2625 evt = dwc->ev_buffs[buf];
2627 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
2628 count &= DWC3_GEVNTCOUNT_MASK;
2633 evt->flags |= DWC3_EVENT_PENDING;
2635 /* Mask interrupt */
2636 reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
2637 reg |= DWC3_GEVNTSIZ_INTMASK;
2638 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
2640 return IRQ_WAKE_THREAD;
2643 static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
2645 struct dwc3 *dwc = _dwc;
2647 irqreturn_t ret = IRQ_NONE;
2649 spin_lock(&dwc->lock);
2651 for (i = 0; i < dwc->num_event_buffers; i++) {
2654 status = dwc3_check_event_buf(dwc, i);
2655 if (status == IRQ_WAKE_THREAD)
2659 spin_unlock(&dwc->lock);
2665 * dwc3_gadget_init - Initializes gadget related registers
2666 * @dwc: pointer to our controller context structure
2668 * Returns 0 on success otherwise negative errno.
2670 int dwc3_gadget_init(struct dwc3 *dwc)
2674 dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2675 &dwc->ctrl_req_addr, GFP_KERNEL);
2676 if (!dwc->ctrl_req) {
2677 dev_err(dwc->dev, "failed to allocate ctrl request\n");
2682 dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2683 &dwc->ep0_trb_addr, GFP_KERNEL);
2684 if (!dwc->ep0_trb) {
2685 dev_err(dwc->dev, "failed to allocate ep0 trb\n");
2690 dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
2691 if (!dwc->setup_buf) {
2692 dev_err(dwc->dev, "failed to allocate setup buffer\n");
2697 dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
2698 DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
2700 if (!dwc->ep0_bounce) {
2701 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
2706 dwc->gadget.ops = &dwc3_gadget_ops;
2707 dwc->gadget.max_speed = USB_SPEED_SUPER;
2708 dwc->gadget.speed = USB_SPEED_UNKNOWN;
2709 dwc->gadget.sg_supported = true;
2710 dwc->gadget.name = "dwc3-gadget";
2713 * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
2716 dwc->gadget.quirk_ep_out_aligned_size = true;
2719 * REVISIT: Here we should clear all pending IRQs to be
2720 * sure we're starting from a well known location.
2723 ret = dwc3_gadget_init_endpoints(dwc);
2727 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
2729 dev_err(dwc->dev, "failed to register udc\n");
2736 dwc3_gadget_free_endpoints(dwc);
2737 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2738 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2741 kfree(dwc->setup_buf);
2744 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2745 dwc->ep0_trb, dwc->ep0_trb_addr);
2748 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2749 dwc->ctrl_req, dwc->ctrl_req_addr);
2755 /* -------------------------------------------------------------------------- */
2757 void dwc3_gadget_exit(struct dwc3 *dwc)
2759 usb_del_gadget_udc(&dwc->gadget);
2761 dwc3_gadget_free_endpoints(dwc);
2763 dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
2764 dwc->ep0_bounce, dwc->ep0_bounce_addr);
2766 kfree(dwc->setup_buf);
2768 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
2769 dwc->ep0_trb, dwc->ep0_trb_addr);
2771 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
2772 dwc->ctrl_req, dwc->ctrl_req_addr);
2775 int dwc3_gadget_prepare(struct dwc3 *dwc)
2777 if (dwc->pullups_connected) {
2778 dwc3_gadget_disable_irq(dwc);
2779 dwc3_gadget_run_stop(dwc, true, true);
2785 void dwc3_gadget_complete(struct dwc3 *dwc)
2787 if (dwc->pullups_connected) {
2788 dwc3_gadget_enable_irq(dwc);
2789 dwc3_gadget_run_stop(dwc, true, false);
2793 int dwc3_gadget_suspend(struct dwc3 *dwc)
2795 __dwc3_gadget_ep_disable(dwc->eps[0]);
2796 __dwc3_gadget_ep_disable(dwc->eps[1]);
2798 dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
2803 int dwc3_gadget_resume(struct dwc3 *dwc)
2805 struct dwc3_ep *dep;
2808 /* Start with SuperSpeed Default */
2809 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
2812 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2818 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
2823 /* begin to receive SETUP packets */
2824 dwc->ep0state = EP0_SETUP_PHASE;
2825 dwc3_ep0_out_start(dwc);
2827 dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
2832 __dwc3_gadget_ep_disable(dwc->eps[0]);