/** * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link * * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com * * Authors: Felipe Balbi , * Sebastian Andrzej Siewior * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 of * the License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "debug.h" #include "core.h" #include "gadget.h" #include "io.h" /** * dwc3_gadget_set_test_mode - Enables USB2 Test Modes * @dwc: pointer to our context structure * @mode: the mode to set (J, K SE0 NAK, Force Enable) * * Caller should take care of locking. This function will * return 0 on success or -EINVAL if wrong Test Selector * is passed */ int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode) { u32 reg; reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~DWC3_DCTL_TSTCTRL_MASK; switch (mode) { case TEST_J: case TEST_K: case TEST_SE0_NAK: case TEST_PACKET: case TEST_FORCE_EN: reg |= mode << 1; break; default: return -EINVAL; } dwc3_writel(dwc->regs, DWC3_DCTL, reg); return 0; } /** * dwc3_gadget_get_link_state - Gets current state of USB Link * @dwc: pointer to our context structure * * Caller should take care of locking. This function will * return the link state on success (>= 0) or -ETIMEDOUT. */ int dwc3_gadget_get_link_state(struct dwc3 *dwc) { u32 reg; reg = dwc3_readl(dwc->regs, DWC3_DSTS); return DWC3_DSTS_USBLNKST(reg); } /** * dwc3_gadget_set_link_state - Sets USB Link to a particular State * @dwc: pointer to our context structure * @state: the state to put link into * * Caller should take care of locking. This function will * return 0 on success or -ETIMEDOUT. */ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state) { int retries = 10000; u32 reg; /* * Wait until device controller is ready. Only applies to 1.94a and * later RTL. */ if (dwc->revision >= DWC3_REVISION_194A) { while (--retries) { reg = dwc3_readl(dwc->regs, DWC3_DSTS); if (reg & DWC3_DSTS_DCNRD) udelay(5); else break; } if (retries <= 0) return -ETIMEDOUT; } reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK; /* set requested state */ reg |= DWC3_DCTL_ULSTCHNGREQ(state); dwc3_writel(dwc->regs, DWC3_DCTL, reg); /* * The following code is racy when called from dwc3_gadget_wakeup, * and is not needed, at least on newer versions */ if (dwc->revision >= DWC3_REVISION_194A) return 0; /* wait for a change in DSTS */ retries = 10000; while (--retries) { reg = dwc3_readl(dwc->regs, DWC3_DSTS); if (DWC3_DSTS_USBLNKST(reg) == state) return 0; udelay(5); } dwc3_trace(trace_dwc3_gadget, "link state change request timed out"); return -ETIMEDOUT; } /** * dwc3_ep_inc_trb() - Increment a TRB index. * @index - Pointer to the TRB index to increment. * * The index should never point to the link TRB. After incrementing, * if it is point to the link TRB, wrap around to the beginning. The * link TRB is always at the last TRB entry. */ static void dwc3_ep_inc_trb(u8 *index) { (*index)++; if (*index == (DWC3_TRB_NUM - 1)) *index = 0; } static void dwc3_ep_inc_enq(struct dwc3_ep *dep) { dwc3_ep_inc_trb(&dep->trb_enqueue); } static void dwc3_ep_inc_deq(struct dwc3_ep *dep) { dwc3_ep_inc_trb(&dep->trb_dequeue); } void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, int status) { struct dwc3 *dwc = dep->dwc; int i; if (req->started) { i = 0; do { dwc3_ep_inc_deq(dep); } while(++i < req->request.num_mapped_sgs); req->started = false; } list_del(&req->list); req->trb = NULL; if (req->request.status == -EINPROGRESS) req->request.status = status; if (dwc->ep0_bounced && dep->number == 0) dwc->ep0_bounced = false; else usb_gadget_unmap_request(&dwc->gadget, &req->request, req->direction); trace_dwc3_gadget_giveback(req); spin_unlock(&dwc->lock); usb_gadget_giveback_request(&dep->endpoint, &req->request); spin_lock(&dwc->lock); if (dep->number > 1) pm_runtime_put(dwc->dev); } int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param) { u32 timeout = 500; int status = 0; int ret = 0; u32 reg; dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param); dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT); do { reg = dwc3_readl(dwc->regs, DWC3_DGCMD); if (!(reg & DWC3_DGCMD_CMDACT)) { status = DWC3_DGCMD_STATUS(reg); if (status) ret = -EINVAL; break; } } while (timeout--); if (!timeout) { ret = -ETIMEDOUT; status = -ETIMEDOUT; } trace_dwc3_gadget_generic_cmd(cmd, param, status); return ret; } static int __dwc3_gadget_wakeup(struct dwc3 *dwc); int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd, struct dwc3_gadget_ep_cmd_params *params) { struct dwc3 *dwc = dep->dwc; u32 timeout = 500; u32 reg; int cmd_status = 0; int susphy = false; int ret = -EINVAL; /* * Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if * we're issuing an endpoint command, we must check if * GUSB2PHYCFG.SUSPHY bit is set. If it is, then we need to clear it. * * We will also set SUSPHY bit to what it was before returning as stated * by the same section on Synopsys databook. */ if (dwc->gadget.speed <= USB_SPEED_HIGH) { reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) { susphy = true; reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); } } if (cmd == DWC3_DEPCMD_STARTTRANSFER) { int needs_wakeup; needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 || dwc->link_state == DWC3_LINK_STATE_U2 || dwc->link_state == DWC3_LINK_STATE_U3); if (unlikely(needs_wakeup)) { ret = __dwc3_gadget_wakeup(dwc); dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", ret); } } dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0); dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1); dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2); dwc3_writel(dep->regs, DWC3_DEPCMD, cmd | DWC3_DEPCMD_CMDACT); do { reg = dwc3_readl(dep->regs, DWC3_DEPCMD); if (!(reg & DWC3_DEPCMD_CMDACT)) { cmd_status = DWC3_DEPCMD_STATUS(reg); switch (cmd_status) { case 0: ret = 0; break; case DEPEVT_TRANSFER_NO_RESOURCE: ret = -EINVAL; break; case DEPEVT_TRANSFER_BUS_EXPIRY: /* * SW issues START TRANSFER command to * isochronous ep with future frame interval. If * future interval time has already passed when * core receives the command, it will respond * with an error status of 'Bus Expiry'. * * Instead of always returning -EINVAL, let's * give a hint to the gadget driver that this is * the case by returning -EAGAIN. */ ret = -EAGAIN; break; default: dev_WARN(dwc->dev, "UNKNOWN cmd status\n"); } break; } } while (--timeout); if (timeout == 0) { ret = -ETIMEDOUT; cmd_status = -ETIMEDOUT; } trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status); if (unlikely(susphy)) { reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); reg |= DWC3_GUSB2PHYCFG_SUSPHY; dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); } return ret; } static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; struct dwc3_gadget_ep_cmd_params params; u32 cmd = DWC3_DEPCMD_CLEARSTALL; /* * As of core revision 2.60a the recommended programming model * is to set the ClearPendIN bit when issuing a Clear Stall EP * command for IN endpoints. This is to prevent an issue where * some (non-compliant) hosts may not send ACK TPs for pending * IN transfers due to a mishandled error condition. Synopsys * STAR 9000614252. */ if (dep->direction && (dwc->revision >= DWC3_REVISION_260A)) cmd |= DWC3_DEPCMD_CLEARPENDIN; memset(¶ms, 0, sizeof(params)); return dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); } static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep, struct dwc3_trb *trb) { u32 offset = (char *) trb - (char *) dep->trb_pool; return dep->trb_pool_dma + offset; } static int dwc3_alloc_trb_pool(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; if (dep->trb_pool) return 0; dep->trb_pool = dma_alloc_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM, &dep->trb_pool_dma, GFP_KERNEL); if (!dep->trb_pool) { dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n", dep->name); return -ENOMEM; } return 0; } static void dwc3_free_trb_pool(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM, dep->trb_pool, dep->trb_pool_dma); dep->trb_pool = NULL; dep->trb_pool_dma = 0; } static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep); /** * dwc3_gadget_start_config - Configure EP resources * @dwc: pointer to our controller context structure * @dep: endpoint that is being enabled * * The assignment of transfer resources cannot perfectly follow the * data book due to the fact that the controller driver does not have * all knowledge of the configuration in advance. It is given this * information piecemeal by the composite gadget framework after every * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook * programming model in this scenario can cause errors. For two * reasons: * * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of * multiple interfaces. * * 2) The databook does not mention doing more DEPXFERCFG for new * endpoint on alt setting (8.1.6). * * The following simplified method is used instead: * * All hardware endpoints can be assigned a transfer resource and this * setting will stay persistent until either a core reset or * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and * do DEPXFERCFG for every hardware endpoint as well. We are * guaranteed that there are as many transfer resources as endpoints. * * This function is called for each endpoint when it is being enabled * but is triggered only when called for EP0-out, which always happens * first, and which should only happen in one of the above conditions. */ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_gadget_ep_cmd_params params; u32 cmd; int i; int ret; if (dep->number) return 0; memset(¶ms, 0x00, sizeof(params)); cmd = DWC3_DEPCMD_DEPSTARTCFG; ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); if (ret) return ret; for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) { struct dwc3_ep *dep = dwc->eps[i]; if (!dep) continue; ret = dwc3_gadget_set_xfer_resource(dwc, dep); if (ret) return ret; } return 0; } static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep, const struct usb_endpoint_descriptor *desc, const struct usb_ss_ep_comp_descriptor *comp_desc, bool modify, bool restore) { struct dwc3_gadget_ep_cmd_params params; if (dev_WARN_ONCE(dwc->dev, modify && restore, "Can't modify and restore\n")) return -EINVAL; memset(¶ms, 0x00, sizeof(params)); params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc)) | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc)); /* Burst size is only needed in SuperSpeed mode */ if (dwc->gadget.speed >= USB_SPEED_SUPER) { u32 burst = dep->endpoint.maxburst; params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1); } if (modify) { params.param0 |= DWC3_DEPCFG_ACTION_MODIFY; } else if (restore) { params.param0 |= DWC3_DEPCFG_ACTION_RESTORE; params.param2 |= dep->saved_state; } else { params.param0 |= DWC3_DEPCFG_ACTION_INIT; } params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN; if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc)) params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN; if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) { params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE | DWC3_DEPCFG_STREAM_EVENT_EN; dep->stream_capable = true; } if (!usb_endpoint_xfer_control(desc)) params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN; /* * We are doing 1:1 mapping for endpoints, meaning * Physical Endpoints 2 maps to Logical Endpoint 2 and * so on. We consider the direction bit as part of the physical * endpoint number. So USB endpoint 0x81 is 0x03. */ params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number); /* * We must use the lower 16 TX FIFOs even though * HW might have more */ if (dep->direction) params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1); if (desc->bInterval) { params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1); dep->interval = 1 << (desc->bInterval - 1); } return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, ¶ms); } static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_gadget_ep_cmd_params params; memset(¶ms, 0x00, sizeof(params)); params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1); return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms); } /** * __dwc3_gadget_ep_enable - Initializes a HW endpoint * @dep: endpoint to be initialized * @desc: USB Endpoint Descriptor * * Caller should take care of locking */ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, const struct usb_endpoint_descriptor *desc, const struct usb_ss_ep_comp_descriptor *comp_desc, bool modify, bool restore) { struct dwc3 *dwc = dep->dwc; u32 reg; int ret; dwc3_trace(trace_dwc3_gadget, "Enabling %s", dep->name); if (!(dep->flags & DWC3_EP_ENABLED)) { ret = dwc3_gadget_start_config(dwc, dep); if (ret) return ret; } ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, modify, restore); if (ret) return ret; if (!(dep->flags & DWC3_EP_ENABLED)) { struct dwc3_trb *trb_st_hw; struct dwc3_trb *trb_link; dep->endpoint.desc = desc; dep->comp_desc = comp_desc; dep->type = usb_endpoint_type(desc); dep->flags |= DWC3_EP_ENABLED; reg = dwc3_readl(dwc->regs, DWC3_DALEPENA); reg |= DWC3_DALEPENA_EP(dep->number); dwc3_writel(dwc->regs, DWC3_DALEPENA, reg); if (usb_endpoint_xfer_control(desc)) return 0; /* Initialize the TRB ring */ dep->trb_dequeue = 0; dep->trb_enqueue = 0; memset(dep->trb_pool, 0, sizeof(struct dwc3_trb) * DWC3_TRB_NUM); /* Link TRB. The HWO bit is never reset */ trb_st_hw = &dep->trb_pool[0]; trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1]; trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw)); trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw)); trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB; trb_link->ctrl |= DWC3_TRB_CTRL_HWO; } return 0; } static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force); static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_request *req; dwc3_stop_active_transfer(dwc, dep->number, true); /* - giveback all requests to gadget driver */ while (!list_empty(&dep->started_list)) { req = next_request(&dep->started_list); dwc3_gadget_giveback(dep, req, -ESHUTDOWN); } while (!list_empty(&dep->pending_list)) { req = next_request(&dep->pending_list); dwc3_gadget_giveback(dep, req, -ESHUTDOWN); } } /** * __dwc3_gadget_ep_disable - Disables a HW endpoint * @dep: the endpoint to disable * * This function also removes requests which are currently processed ny the * hardware and those which are not yet scheduled. * Caller should take care of locking. */ static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; u32 reg; dwc3_trace(trace_dwc3_gadget, "Disabling %s", dep->name); dwc3_remove_requests(dwc, dep); /* make sure HW endpoint isn't stalled */ if (dep->flags & DWC3_EP_STALL) __dwc3_gadget_ep_set_halt(dep, 0, false); reg = dwc3_readl(dwc->regs, DWC3_DALEPENA); reg &= ~DWC3_DALEPENA_EP(dep->number); dwc3_writel(dwc->regs, DWC3_DALEPENA, reg); dep->stream_capable = false; dep->endpoint.desc = NULL; dep->comp_desc = NULL; dep->type = 0; dep->flags = 0; return 0; } /* -------------------------------------------------------------------------- */ static int dwc3_gadget_ep0_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc) { return -EINVAL; } static int dwc3_gadget_ep0_disable(struct usb_ep *ep) { return -EINVAL; } /* -------------------------------------------------------------------------- */ static int dwc3_gadget_ep_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc) { struct dwc3_ep *dep; struct dwc3 *dwc; unsigned long flags; int ret; if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { pr_debug("dwc3: invalid parameters\n"); return -EINVAL; } if (!desc->wMaxPacketSize) { pr_debug("dwc3: missing wMaxPacketSize\n"); return -EINVAL; } dep = to_dwc3_ep(ep); dwc = dep->dwc; if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED, "%s is already enabled\n", dep->name)) return 0; spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static int dwc3_gadget_ep_disable(struct usb_ep *ep) { struct dwc3_ep *dep; struct dwc3 *dwc; unsigned long flags; int ret; if (!ep) { pr_debug("dwc3: invalid parameters\n"); return -EINVAL; } dep = to_dwc3_ep(ep); dwc = dep->dwc; if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED), "%s is already disabled\n", dep->name)) return 0; spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_ep_disable(dep); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) { struct dwc3_request *req; struct dwc3_ep *dep = to_dwc3_ep(ep); req = kzalloc(sizeof(*req), gfp_flags); if (!req) return NULL; req->epnum = dep->number; req->dep = dep; dep->allocated_requests++; trace_dwc3_alloc_request(req); return &req->request; } static void dwc3_gadget_ep_free_request(struct usb_ep *ep, struct usb_request *request) { struct dwc3_request *req = to_dwc3_request(request); struct dwc3_ep *dep = to_dwc3_ep(ep); dep->allocated_requests--; trace_dwc3_free_request(req); kfree(req); } /** * dwc3_prepare_one_trb - setup one TRB from one request * @dep: endpoint for which this request is prepared * @req: dwc3_request pointer */ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_request *req, dma_addr_t dma, unsigned length, unsigned last, unsigned chain, unsigned node) { struct dwc3_trb *trb; dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s%s", dep->name, req, (unsigned long long) dma, length, last ? " last" : "", chain ? " chain" : ""); trb = &dep->trb_pool[dep->trb_enqueue]; if (!req->trb) { dwc3_gadget_move_started_request(req); req->trb = trb; req->trb_dma = dwc3_trb_dma_offset(dep, trb); req->first_trb_index = dep->trb_enqueue; } dwc3_ep_inc_enq(dep); trb->size = DWC3_TRB_SIZE_LENGTH(length); trb->bpl = lower_32_bits(dma); trb->bph = upper_32_bits(dma); switch (usb_endpoint_type(dep->endpoint.desc)) { case USB_ENDPOINT_XFER_CONTROL: trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP; break; case USB_ENDPOINT_XFER_ISOC: if (!node) trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST; else trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS; /* always enable Interrupt on Missed ISOC */ trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI; break; case USB_ENDPOINT_XFER_BULK: case USB_ENDPOINT_XFER_INT: trb->ctrl = DWC3_TRBCTL_NORMAL; break; default: /* * This is only possible with faulty memory because we * checked it already :) */ BUG(); } /* always enable Continue on Short Packet */ trb->ctrl |= DWC3_TRB_CTRL_CSP; if (!req->request.no_interrupt && !chain) trb->ctrl |= DWC3_TRB_CTRL_IOC | DWC3_TRB_CTRL_ISP_IMI; if (last && !usb_endpoint_xfer_isoc(dep->endpoint.desc)) trb->ctrl |= DWC3_TRB_CTRL_LST; if (chain) trb->ctrl |= DWC3_TRB_CTRL_CHN; if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable) trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id); trb->ctrl |= DWC3_TRB_CTRL_HWO; dep->queued_requests++; trace_dwc3_prepare_trb(dep, trb); } /** * dwc3_ep_prev_trb() - Returns the previous TRB in the ring * @dep: The endpoint with the TRB ring * @index: The index of the current TRB in the ring * * Returns the TRB prior to the one pointed to by the index. If the * index is 0, we will wrap backwards, skip the link TRB, and return * the one just before that. */ static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index) { if (!index) index = DWC3_TRB_NUM - 2; else index = dep->trb_enqueue - 1; return &dep->trb_pool[index]; } static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep) { struct dwc3_trb *tmp; u8 trbs_left; /* * If enqueue & dequeue are equal than it is either full or empty. * * One way to know for sure is if the TRB right before us has HWO bit * set or not. If it has, then we're definitely full and can't fit any * more transfers in our ring. */ if (dep->trb_enqueue == dep->trb_dequeue) { tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue); if (tmp->ctrl & DWC3_TRB_CTRL_HWO) return 0; return DWC3_TRB_NUM - 1; } trbs_left = dep->trb_dequeue - dep->trb_enqueue; trbs_left &= (DWC3_TRB_NUM - 1); if (dep->trb_dequeue < dep->trb_enqueue) trbs_left--; return trbs_left; } static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep, struct dwc3_request *req, unsigned int trbs_left, unsigned int more_coming) { struct usb_request *request = &req->request; struct scatterlist *sg = request->sg; struct scatterlist *s; unsigned int last = false; unsigned int length; dma_addr_t dma; int i; for_each_sg(sg, s, request->num_mapped_sgs, i) { unsigned chain = true; length = sg_dma_len(s); dma = sg_dma_address(s); if (sg_is_last(s)) { if (usb_endpoint_xfer_int(dep->endpoint.desc) || !more_coming) last = true; chain = false; } if (!trbs_left--) last = true; if (last) chain = false; dwc3_prepare_one_trb(dep, req, dma, length, last, chain, i); if (last) break; } } static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep, struct dwc3_request *req, unsigned int trbs_left, unsigned int more_coming) { unsigned int last = false; unsigned int length; dma_addr_t dma; dma = req->request.dma; length = req->request.length; if (!trbs_left) last = true; /* Is this the last request? */ if (usb_endpoint_xfer_int(dep->endpoint.desc) || !more_coming) last = true; dwc3_prepare_one_trb(dep, req, dma, length, last, false, 0); } /* * dwc3_prepare_trbs - setup TRBs from requests * @dep: endpoint for which requests are being prepared * * The function goes through the requests list and sets up TRBs for the * transfers. The function returns once there are no more TRBs available or * it runs out of requests. */ static void dwc3_prepare_trbs(struct dwc3_ep *dep) { struct dwc3_request *req, *n; unsigned int more_coming; u32 trbs_left; BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); trbs_left = dwc3_calc_trbs_left(dep); if (!trbs_left) return; more_coming = dep->allocated_requests - dep->queued_requests; list_for_each_entry_safe(req, n, &dep->pending_list, list) { if (req->request.num_mapped_sgs > 0) dwc3_prepare_one_trb_sg(dep, req, trbs_left--, more_coming); else dwc3_prepare_one_trb_linear(dep, req, trbs_left--, more_coming); if (!trbs_left) return; } } static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param) { struct dwc3_gadget_ep_cmd_params params; struct dwc3_request *req; struct dwc3 *dwc = dep->dwc; int starting; int ret; u32 cmd; starting = !(dep->flags & DWC3_EP_BUSY); dwc3_prepare_trbs(dep); req = next_request(&dep->started_list); if (!req) { dep->flags |= DWC3_EP_PENDING_REQUEST; return 0; } memset(¶ms, 0, sizeof(params)); if (starting) { params.param0 = upper_32_bits(req->trb_dma); params.param1 = lower_32_bits(req->trb_dma); cmd = DWC3_DEPCMD_STARTTRANSFER | DWC3_DEPCMD_PARAM(cmd_param); } else { cmd = DWC3_DEPCMD_UPDATETRANSFER | DWC3_DEPCMD_PARAM(dep->resource_index); } ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); if (ret < 0) { /* * FIXME we need to iterate over the list of requests * here and stop, unmap, free and del each of the linked * requests instead of what we do now. */ usb_gadget_unmap_request(&dwc->gadget, &req->request, req->direction); list_del(&req->list); return ret; } dep->flags |= DWC3_EP_BUSY; if (starting) { dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep); WARN_ON_ONCE(!dep->resource_index); } return 0; } static void __dwc3_gadget_start_isoc(struct dwc3 *dwc, struct dwc3_ep *dep, u32 cur_uf) { u32 uf; if (list_empty(&dep->pending_list)) { dwc3_trace(trace_dwc3_gadget, "ISOC ep %s run out for requests", dep->name); dep->flags |= DWC3_EP_PENDING_REQUEST; return; } /* 4 micro frames in the future */ uf = cur_uf + dep->interval * 4; __dwc3_gadget_kick_transfer(dep, uf); } static void dwc3_gadget_start_isoc(struct dwc3 *dwc, struct dwc3_ep *dep, const struct dwc3_event_depevt *event) { u32 cur_uf, mask; mask = ~(dep->interval - 1); cur_uf = event->parameters & mask; __dwc3_gadget_start_isoc(dwc, dep, cur_uf); } static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) { struct dwc3 *dwc = dep->dwc; int ret; if (!dep->endpoint.desc) { dwc3_trace(trace_dwc3_gadget, "trying to queue request %p to disabled %s", &req->request, dep->endpoint.name); return -ESHUTDOWN; } if (WARN(req->dep != dep, "request %p belongs to '%s'\n", &req->request, req->dep->name)) { dwc3_trace(trace_dwc3_gadget, "request %p belongs to '%s'", &req->request, req->dep->name); return -EINVAL; } pm_runtime_get(dwc->dev); req->request.actual = 0; req->request.status = -EINPROGRESS; req->direction = dep->direction; req->epnum = dep->number; trace_dwc3_ep_queue(req); /* * We only add to our list of requests now and * start consuming the list once we get XferNotReady * IRQ. * * That way, we avoid doing anything that we don't need * to do now and defer it until the point we receive a * particular token from the Host side. * * This will also avoid Host cancelling URBs due to too * many NAKs. */ ret = usb_gadget_map_request(&dwc->gadget, &req->request, dep->direction); if (ret) return ret; list_add_tail(&req->list, &dep->pending_list); /* * If there are no pending requests and the endpoint isn't already * busy, we will just start the request straight away. * * This will save one IRQ (XFER_NOT_READY) and possibly make it a * little bit faster. */ if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) && !usb_endpoint_xfer_int(dep->endpoint.desc)) { ret = __dwc3_gadget_kick_transfer(dep, 0); goto out; } /* * There are a few special cases: * * 1. XferNotReady with empty list of requests. We need to kick the * transfer here in that situation, otherwise we will be NAKing * forever. If we get XferNotReady before gadget driver has a * chance to queue a request, we will ACK the IRQ but won't be * able to receive the data until the next request is queued. * The following code is handling exactly that. * */ if (dep->flags & DWC3_EP_PENDING_REQUEST) { /* * If xfernotready is already elapsed and it is a case * of isoc transfer, then issue END TRANSFER, so that * you can receive xfernotready again and can have * notion of current microframe. */ if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { if (list_empty(&dep->started_list)) { dwc3_stop_active_transfer(dwc, dep->number, true); dep->flags = DWC3_EP_ENABLED; } return 0; } ret = __dwc3_gadget_kick_transfer(dep, 0); if (!ret) dep->flags &= ~DWC3_EP_PENDING_REQUEST; goto out; } /* * 2. XferInProgress on Isoc EP with an active transfer. We need to * kick the transfer here after queuing a request, otherwise the * core may not see the modified TRB(s). */ if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && (dep->flags & DWC3_EP_BUSY) && !(dep->flags & DWC3_EP_MISSED_ISOC)) { WARN_ON_ONCE(!dep->resource_index); ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index); goto out; } /* * 4. Stream Capable Bulk Endpoints. We need to start the transfer * right away, otherwise host will not know we have streams to be * handled. */ if (dep->stream_capable) ret = __dwc3_gadget_kick_transfer(dep, 0); out: if (ret && ret != -EBUSY) dwc3_trace(trace_dwc3_gadget, "%s: failed to kick transfers", dep->name); if (ret == -EBUSY) ret = 0; return ret; } static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep, struct usb_request *request) { dwc3_gadget_ep_free_request(ep, request); } static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_request *req; struct usb_request *request; struct usb_ep *ep = &dep->endpoint; dwc3_trace(trace_dwc3_gadget, "queueing ZLP"); request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC); if (!request) return -ENOMEM; request->length = 0; request->buf = dwc->zlp_buf; request->complete = __dwc3_gadget_ep_zlp_complete; req = to_dwc3_request(request); return __dwc3_gadget_ep_queue(dep, req); } static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, gfp_t gfp_flags) { struct dwc3_request *req = to_dwc3_request(request); struct dwc3_ep *dep = to_dwc3_ep(ep); struct dwc3 *dwc = dep->dwc; unsigned long flags; int ret; spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_ep_queue(dep, req); /* * Okay, here's the thing, if gadget driver has requested for a ZLP by * setting request->zero, instead of doing magic, we will just queue an * extra usb_request ourselves so that it gets handled the same way as * any other request. */ if (ret == 0 && request->zero && request->length && (request->length % ep->maxpacket == 0)) ret = __dwc3_gadget_ep_queue_zlp(dwc, dep); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static int dwc3_gadget_ep_dequeue(struct usb_ep *ep, struct usb_request *request) { struct dwc3_request *req = to_dwc3_request(request); struct dwc3_request *r = NULL; struct dwc3_ep *dep = to_dwc3_ep(ep); struct dwc3 *dwc = dep->dwc; unsigned long flags; int ret = 0; trace_dwc3_ep_dequeue(req); spin_lock_irqsave(&dwc->lock, flags); list_for_each_entry(r, &dep->pending_list, list) { if (r == req) break; } if (r != req) { list_for_each_entry(r, &dep->started_list, list) { if (r == req) break; } if (r == req) { /* wait until it is processed */ dwc3_stop_active_transfer(dwc, dep->number, true); goto out1; } dev_err(dwc->dev, "request %p was not queued to %s\n", request, ep->name); ret = -EINVAL; goto out0; } out1: /* giveback the request */ dwc3_gadget_giveback(dep, req, -ECONNRESET); out0: spin_unlock_irqrestore(&dwc->lock, flags); return ret; } int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol) { struct dwc3_gadget_ep_cmd_params params; struct dwc3 *dwc = dep->dwc; int ret; if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name); return -EINVAL; } memset(¶ms, 0x00, sizeof(params)); if (value) { struct dwc3_trb *trb; unsigned transfer_in_flight; unsigned started; if (dep->number > 1) trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue); else trb = &dwc->ep0_trb[dep->trb_enqueue]; transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO; started = !list_empty(&dep->started_list); if (!protocol && ((dep->direction && transfer_in_flight) || (!dep->direction && started))) { dwc3_trace(trace_dwc3_gadget, "%s: pending request, cannot halt", dep->name); return -EAGAIN; } ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL, ¶ms); if (ret) dev_err(dwc->dev, "failed to set STALL on %s\n", dep->name); else dep->flags |= DWC3_EP_STALL; } else { ret = dwc3_send_clear_stall_ep_cmd(dep); if (ret) dev_err(dwc->dev, "failed to clear STALL on %s\n", dep->name); else dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE); } return ret; } static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value) { struct dwc3_ep *dep = to_dwc3_ep(ep); struct dwc3 *dwc = dep->dwc; unsigned long flags; int ret; spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_ep_set_halt(dep, value, false); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep) { struct dwc3_ep *dep = to_dwc3_ep(ep); struct dwc3 *dwc = dep->dwc; unsigned long flags; int ret; spin_lock_irqsave(&dwc->lock, flags); dep->flags |= DWC3_EP_WEDGE; if (dep->number == 0 || dep->number == 1) ret = __dwc3_gadget_ep0_set_halt(ep, 1); else ret = __dwc3_gadget_ep_set_halt(dep, 1, false); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } /* -------------------------------------------------------------------------- */ static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bmAttributes = USB_ENDPOINT_XFER_CONTROL, }; static const struct usb_ep_ops dwc3_gadget_ep0_ops = { .enable = dwc3_gadget_ep0_enable, .disable = dwc3_gadget_ep0_disable, .alloc_request = dwc3_gadget_ep_alloc_request, .free_request = dwc3_gadget_ep_free_request, .queue = dwc3_gadget_ep0_queue, .dequeue = dwc3_gadget_ep_dequeue, .set_halt = dwc3_gadget_ep0_set_halt, .set_wedge = dwc3_gadget_ep_set_wedge, }; static const struct usb_ep_ops dwc3_gadget_ep_ops = { .enable = dwc3_gadget_ep_enable, .disable = dwc3_gadget_ep_disable, .alloc_request = dwc3_gadget_ep_alloc_request, .free_request = dwc3_gadget_ep_free_request, .queue = dwc3_gadget_ep_queue, .dequeue = dwc3_gadget_ep_dequeue, .set_halt = dwc3_gadget_ep_set_halt, .set_wedge = dwc3_gadget_ep_set_wedge, }; /* -------------------------------------------------------------------------- */ static int dwc3_gadget_get_frame(struct usb_gadget *g) { struct dwc3 *dwc = gadget_to_dwc(g); u32 reg; reg = dwc3_readl(dwc->regs, DWC3_DSTS); return DWC3_DSTS_SOFFN(reg); } static int __dwc3_gadget_wakeup(struct dwc3 *dwc) { int retries; int ret; u32 reg; u8 link_state; u8 speed; /* * According to the Databook Remote wakeup request should * be issued only when the device is in early suspend state. * * We can check that via USB Link State bits in DSTS register. */ reg = dwc3_readl(dwc->regs, DWC3_DSTS); speed = reg & DWC3_DSTS_CONNECTSPD; if ((speed == DWC3_DSTS_SUPERSPEED) || (speed == DWC3_DSTS_SUPERSPEED_PLUS)) { dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed"); return 0; } link_state = DWC3_DSTS_USBLNKST(reg); switch (link_state) { case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */ case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */ break; default: dwc3_trace(trace_dwc3_gadget, "can't wakeup from '%s'", dwc3_gadget_link_string(link_state)); return -EINVAL; } ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV); if (ret < 0) { dev_err(dwc->dev, "failed to put link in Recovery\n"); return ret; } /* Recent versions do this automatically */ if (dwc->revision < DWC3_REVISION_194A) { /* write zeroes to Link Change Request */ reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK; dwc3_writel(dwc->regs, DWC3_DCTL, reg); } /* poll until Link State changes to ON */ retries = 20000; while (retries--) { reg = dwc3_readl(dwc->regs, DWC3_DSTS); /* in HS, means ON */ if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0) break; } if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) { dev_err(dwc->dev, "failed to send remote wakeup\n"); return -EINVAL; } return 0; } static int dwc3_gadget_wakeup(struct usb_gadget *g) { struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags; int ret; spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_wakeup(dwc); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static int dwc3_gadget_set_selfpowered(struct usb_gadget *g, int is_selfpowered) { struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags; spin_lock_irqsave(&dwc->lock, flags); g->is_selfpowered = !!is_selfpowered; spin_unlock_irqrestore(&dwc->lock, flags); return 0; } static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend) { u32 reg; u32 timeout = 500; if (pm_runtime_suspended(dwc->dev)) return 0; reg = dwc3_readl(dwc->regs, DWC3_DCTL); if (is_on) { if (dwc->revision <= DWC3_REVISION_187A) { reg &= ~DWC3_DCTL_TRGTULST_MASK; reg |= DWC3_DCTL_TRGTULST_RX_DET; } if (dwc->revision >= DWC3_REVISION_194A) reg &= ~DWC3_DCTL_KEEP_CONNECT; reg |= DWC3_DCTL_RUN_STOP; if (dwc->has_hibernation) reg |= DWC3_DCTL_KEEP_CONNECT; dwc->pullups_connected = true; } else { reg &= ~DWC3_DCTL_RUN_STOP; if (dwc->has_hibernation && !suspend) reg &= ~DWC3_DCTL_KEEP_CONNECT; dwc->pullups_connected = false; } dwc3_writel(dwc->regs, DWC3_DCTL, reg); do { reg = dwc3_readl(dwc->regs, DWC3_DSTS); reg &= DWC3_DSTS_DEVCTRLHLT; } while (--timeout && !(!is_on ^ !reg)); if (!timeout) return -ETIMEDOUT; dwc3_trace(trace_dwc3_gadget, "gadget %s data soft-%s", dwc->gadget_driver ? dwc->gadget_driver->function : "no-function", is_on ? "connect" : "disconnect"); return 0; } static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) { struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags; int ret; is_on = !!is_on; spin_lock_irqsave(&dwc->lock, flags); ret = dwc3_gadget_run_stop(dwc, is_on, false); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static void dwc3_gadget_enable_irq(struct dwc3 *dwc) { u32 reg; /* Enable all but Start and End of Frame IRQs */ reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN | DWC3_DEVTEN_EVNTOVERFLOWEN | DWC3_DEVTEN_CMDCMPLTEN | DWC3_DEVTEN_ERRTICERREN | DWC3_DEVTEN_WKUPEVTEN | DWC3_DEVTEN_ULSTCNGEN | DWC3_DEVTEN_CONNECTDONEEN | DWC3_DEVTEN_USBRSTEN | DWC3_DEVTEN_DISCONNEVTEN); dwc3_writel(dwc->regs, DWC3_DEVTEN, reg); } static void dwc3_gadget_disable_irq(struct dwc3 *dwc) { /* mask all interrupts */ dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00); } static irqreturn_t dwc3_interrupt(int irq, void *_dwc); static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc); /** * dwc3_gadget_setup_nump - Calculate and initialize NUMP field of DCFG * dwc: pointer to our context structure * * The following looks like complex but it's actually very simple. In order to * calculate the number of packets we can burst at once on OUT transfers, we're * gonna use RxFIFO size. * * To calculate RxFIFO size we need two numbers: * MDWIDTH = size, in bits, of the internal memory bus * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits) * * Given these two numbers, the formula is simple: * * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16; * * 24 bytes is for 3x SETUP packets * 16 bytes is a clock domain crossing tolerance * * Given RxFIFO Size, NUMP = RxFIFOSize / 1024; */ static void dwc3_gadget_setup_nump(struct dwc3 *dwc) { u32 ram2_depth; u32 mdwidth; u32 nump; u32 reg; ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7); mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0); nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024; nump = min_t(u32, nump, 16); /* update NumP */ reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg &= ~DWC3_DCFG_NUMP_MASK; reg |= nump << DWC3_DCFG_NUMP_SHIFT; dwc3_writel(dwc->regs, DWC3_DCFG, reg); } static int __dwc3_gadget_start(struct dwc3 *dwc) { struct dwc3_ep *dep; int ret = 0; u32 reg; reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg &= ~(DWC3_DCFG_SPEED_MASK); /** * WORKAROUND: DWC3 revision < 2.20a have an issue * which would cause metastability state on Run/Stop * bit if we try to force the IP to USB2-only mode. * * Because of that, we cannot configure the IP to any * speed other than the SuperSpeed * * Refers to: * * STAR#9000525659: Clock Domain Crossing on DCTL in * USB 2.0 Mode */ if (dwc->revision < DWC3_REVISION_220A) { reg |= DWC3_DCFG_SUPERSPEED; } else { switch (dwc->maximum_speed) { case USB_SPEED_LOW: reg |= DWC3_DCFG_LOWSPEED; break; case USB_SPEED_FULL: reg |= DWC3_DCFG_FULLSPEED1; break; case USB_SPEED_HIGH: reg |= DWC3_DCFG_HIGHSPEED; break; case USB_SPEED_SUPER_PLUS: reg |= DWC3_DCFG_SUPERSPEED_PLUS; break; default: dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n", dwc->maximum_speed); /* fall through */ case USB_SPEED_SUPER: reg |= DWC3_DCFG_SUPERSPEED; break; } } dwc3_writel(dwc->regs, DWC3_DCFG, reg); /* * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP * field instead of letting dwc3 itself calculate that automatically. * * This way, we maximize the chances that we'll be able to get several * bursts of data without going through any sort of endpoint throttling. */ reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG); reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL; dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg); dwc3_gadget_setup_nump(dwc); /* Start with SuperSpeed Default */ dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); dep = dwc->eps[0]; ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false, false); if (ret) { dev_err(dwc->dev, "failed to enable %s\n", dep->name); goto err0; } dep = dwc->eps[1]; ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false, false); if (ret) { dev_err(dwc->dev, "failed to enable %s\n", dep->name); goto err1; } /* begin to receive SETUP packets */ dwc->ep0state = EP0_SETUP_PHASE; dwc3_ep0_out_start(dwc); dwc3_gadget_enable_irq(dwc); return 0; err1: __dwc3_gadget_ep_disable(dwc->eps[0]); err0: return ret; } static int dwc3_gadget_start(struct usb_gadget *g, struct usb_gadget_driver *driver) { struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags; int ret = 0; int irq; irq = dwc->irq_gadget; ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt, IRQF_SHARED, "dwc3", dwc->ev_buf); if (ret) { dev_err(dwc->dev, "failed to request irq #%d --> %d\n", irq, ret); goto err0; } spin_lock_irqsave(&dwc->lock, flags); if (dwc->gadget_driver) { dev_err(dwc->dev, "%s is already bound to %s\n", dwc->gadget.name, dwc->gadget_driver->driver.name); ret = -EBUSY; goto err1; } dwc->gadget_driver = driver; if (pm_runtime_active(dwc->dev)) __dwc3_gadget_start(dwc); spin_unlock_irqrestore(&dwc->lock, flags); return 0; err1: spin_unlock_irqrestore(&dwc->lock, flags); free_irq(irq, dwc); err0: return ret; } static void __dwc3_gadget_stop(struct dwc3 *dwc) { if (pm_runtime_suspended(dwc->dev)) return; dwc3_gadget_disable_irq(dwc); __dwc3_gadget_ep_disable(dwc->eps[0]); __dwc3_gadget_ep_disable(dwc->eps[1]); } static int dwc3_gadget_stop(struct usb_gadget *g) { struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags; spin_lock_irqsave(&dwc->lock, flags); __dwc3_gadget_stop(dwc); dwc->gadget_driver = NULL; spin_unlock_irqrestore(&dwc->lock, flags); free_irq(dwc->irq_gadget, dwc->ev_buf); return 0; } static const struct usb_gadget_ops dwc3_gadget_ops = { .get_frame = dwc3_gadget_get_frame, .wakeup = dwc3_gadget_wakeup, .set_selfpowered = dwc3_gadget_set_selfpowered, .pullup = dwc3_gadget_pullup, .udc_start = dwc3_gadget_start, .udc_stop = dwc3_gadget_stop, }; /* -------------------------------------------------------------------------- */ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc, u8 num, u32 direction) { struct dwc3_ep *dep; u8 i; for (i = 0; i < num; i++) { u8 epnum = (i << 1) | (direction ? 1 : 0); dep = kzalloc(sizeof(*dep), GFP_KERNEL); if (!dep) return -ENOMEM; dep->dwc = dwc; dep->number = epnum; dep->direction = !!direction; dep->regs = dwc->regs + DWC3_DEP_BASE(epnum); dwc->eps[epnum] = dep; snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1, (epnum & 1) ? "in" : "out"); dep->endpoint.name = dep->name; spin_lock_init(&dep->lock); dwc3_trace(trace_dwc3_gadget, "initializing %s", dep->name); if (epnum == 0 || epnum == 1) { usb_ep_set_maxpacket_limit(&dep->endpoint, 512); dep->endpoint.maxburst = 1; dep->endpoint.ops = &dwc3_gadget_ep0_ops; if (!epnum) dwc->gadget.ep0 = &dep->endpoint; } else { int ret; usb_ep_set_maxpacket_limit(&dep->endpoint, 1024); dep->endpoint.max_streams = 15; dep->endpoint.ops = &dwc3_gadget_ep_ops; list_add_tail(&dep->endpoint.ep_list, &dwc->gadget.ep_list); ret = dwc3_alloc_trb_pool(dep); if (ret) return ret; } if (epnum == 0 || epnum == 1) { dep->endpoint.caps.type_control = true; } else { dep->endpoint.caps.type_iso = true; dep->endpoint.caps.type_bulk = true; dep->endpoint.caps.type_int = true; } dep->endpoint.caps.dir_in = !!direction; dep->endpoint.caps.dir_out = !direction; INIT_LIST_HEAD(&dep->pending_list); INIT_LIST_HEAD(&dep->started_list); } return 0; } static int dwc3_gadget_init_endpoints(struct dwc3 *dwc) { int ret; INIT_LIST_HEAD(&dwc->gadget.ep_list); ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0); if (ret < 0) { dwc3_trace(trace_dwc3_gadget, "failed to allocate OUT endpoints"); return ret; } ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1); if (ret < 0) { dwc3_trace(trace_dwc3_gadget, "failed to allocate IN endpoints"); return ret; } return 0; } static void dwc3_gadget_free_endpoints(struct dwc3 *dwc) { struct dwc3_ep *dep; u8 epnum; for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) { dep = dwc->eps[epnum]; if (!dep) continue; /* * Physical endpoints 0 and 1 are special; they form the * bi-directional USB endpoint 0. * * For those two physical endpoints, we don't allocate a TRB * pool nor do we add them the endpoints list. Due to that, we * shouldn't do these two operations otherwise we would end up * with all sorts of bugs when removing dwc3.ko. */ if (epnum != 0 && epnum != 1) { dwc3_free_trb_pool(dep); list_del(&dep->endpoint.ep_list); } kfree(dep); } } /* -------------------------------------------------------------------------- */ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep, struct dwc3_request *req, struct dwc3_trb *trb, const struct dwc3_event_depevt *event, int status, int chain) { unsigned int count; unsigned int s_pkt = 0; unsigned int trb_status; dep->queued_requests--; trace_dwc3_complete_trb(dep, trb); /* * If we're in the middle of series of chained TRBs and we * receive a short transfer along the way, DWC3 will skip * through all TRBs including the last TRB in the chain (the * where CHN bit is zero. DWC3 will also avoid clearing HWO * bit and SW has to do it manually. * * We're going to do that here to avoid problems of HW trying * to use bogus TRBs for transfers. */ if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO)) trb->ctrl &= ~DWC3_TRB_CTRL_HWO; if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN) return 1; count = trb->size & DWC3_TRB_SIZE_MASK; if (dep->direction) { if (count) { trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size); if (trb_status == DWC3_TRBSTS_MISSED_ISOC) { dwc3_trace(trace_dwc3_gadget, "%s: incomplete IN transfer", dep->name); /* * If missed isoc occurred and there is * no request queued then issue END * TRANSFER, so that core generates * next xfernotready and we will issue * a fresh START TRANSFER. * If there are still queued request * then wait, do not issue either END * or UPDATE TRANSFER, just attach next * request in pending_list during * giveback.If any future queued request * is successfully transferred then we * will issue UPDATE TRANSFER for all * request in the pending_list. */ dep->flags |= DWC3_EP_MISSED_ISOC; } else { dev_err(dwc->dev, "incomplete IN transfer %s\n", dep->name); status = -ECONNRESET; } } else { dep->flags &= ~DWC3_EP_MISSED_ISOC; } } else { if (count && (event->status & DEPEVT_STATUS_SHORT)) s_pkt = 1; } if (s_pkt && !chain) return 1; if ((event->status & DEPEVT_STATUS_LST) && (trb->ctrl & (DWC3_TRB_CTRL_LST | DWC3_TRB_CTRL_HWO))) return 1; if ((event->status & DEPEVT_STATUS_IOC) && (trb->ctrl & DWC3_TRB_CTRL_IOC)) return 1; return 0; } static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, const struct dwc3_event_depevt *event, int status) { struct dwc3_request *req; struct dwc3_trb *trb; unsigned int slot; unsigned int i; int count = 0; int ret; do { int chain; req = next_request(&dep->started_list); if (WARN_ON_ONCE(!req)) return 1; chain = req->request.num_mapped_sgs > 0; i = 0; do { slot = req->first_trb_index + i; if (slot == DWC3_TRB_NUM - 1) slot++; slot %= DWC3_TRB_NUM; trb = &dep->trb_pool[slot]; count += trb->size & DWC3_TRB_SIZE_MASK; ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb, event, status, chain); if (ret) break; } while (++i < req->request.num_mapped_sgs); /* * We assume here we will always receive the entire data block * which we should receive. Meaning, if we program RX to * receive 4K but we receive only 2K, we assume that's all we * should receive and we simply bounce the request back to the * gadget driver for further processing. */ req->request.actual += req->request.length - count; dwc3_gadget_giveback(dep, req, status); if (ret) break; } while (1); /* * Our endpoint might get disabled by another thread during * dwc3_gadget_giveback(). If that happens, we're just gonna return 1 * early on so DWC3_EP_BUSY flag gets cleared */ if (!dep->endpoint.desc) return 1; if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && list_empty(&dep->started_list)) { if (list_empty(&dep->pending_list)) { /* * If there is no entry in request list then do * not issue END TRANSFER now. Just set PENDING * flag, so that END TRANSFER is issued when an * entry is added into request list. */ dep->flags = DWC3_EP_PENDING_REQUEST; } else { dwc3_stop_active_transfer(dwc, dep->number, true); dep->flags = DWC3_EP_ENABLED; } return 1; } if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) if ((event->status & DEPEVT_STATUS_IOC) && (trb->ctrl & DWC3_TRB_CTRL_IOC)) return 0; return 1; } static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc, struct dwc3_ep *dep, const struct dwc3_event_depevt *event) { unsigned status = 0; int clean_busy; u32 is_xfer_complete; is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE); if (event->status & DEPEVT_STATUS_BUSERR) status = -ECONNRESET; clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status); if (clean_busy && (!dep->endpoint.desc || is_xfer_complete || usb_endpoint_xfer_isoc(dep->endpoint.desc))) dep->flags &= ~DWC3_EP_BUSY; /* * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround. * See dwc3_gadget_linksts_change_interrupt() for 1st half. */ if (dwc->revision < DWC3_REVISION_183A) { u32 reg; int i; for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) { dep = dwc->eps[i]; if (!(dep->flags & DWC3_EP_ENABLED)) continue; if (!list_empty(&dep->started_list)) return; } reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg |= dwc->u1u2; dwc3_writel(dwc->regs, DWC3_DCTL, reg); dwc->u1u2 = 0; } /* * Our endpoint might get disabled by another thread during * dwc3_gadget_giveback(). If that happens, we're just gonna return 1 * early on so DWC3_EP_BUSY flag gets cleared */ if (!dep->endpoint.desc) return; if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) { int ret; ret = __dwc3_gadget_kick_transfer(dep, 0); if (!ret || ret == -EBUSY) return; } } static void dwc3_endpoint_interrupt(struct dwc3 *dwc, const struct dwc3_event_depevt *event) { struct dwc3_ep *dep; u8 epnum = event->endpoint_number; dep = dwc->eps[epnum]; if (!(dep->flags & DWC3_EP_ENABLED)) return; if (epnum == 0 || epnum == 1) { dwc3_ep0_interrupt(dwc, event); return; } switch (event->endpoint_event) { case DWC3_DEPEVT_XFERCOMPLETE: dep->resource_index = 0; if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { dwc3_trace(trace_dwc3_gadget, "%s is an Isochronous endpoint", dep->name); return; } dwc3_endpoint_transfer_complete(dwc, dep, event); break; case DWC3_DEPEVT_XFERINPROGRESS: dwc3_endpoint_transfer_complete(dwc, dep, event); break; case DWC3_DEPEVT_XFERNOTREADY: if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { dwc3_gadget_start_isoc(dwc, dep, event); } else { int active; int ret; active = event->status & DEPEVT_STATUS_TRANSFER_ACTIVE; dwc3_trace(trace_dwc3_gadget, "%s: reason %s", dep->name, active ? "Transfer Active" : "Transfer Not Active"); ret = __dwc3_gadget_kick_transfer(dep, 0); if (!ret || ret == -EBUSY) return; dwc3_trace(trace_dwc3_gadget, "%s: failed to kick transfers", dep->name); } break; case DWC3_DEPEVT_STREAMEVT: if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) { dev_err(dwc->dev, "Stream event for non-Bulk %s\n", dep->name); return; } switch (event->status) { case DEPEVT_STREAMEVT_FOUND: dwc3_trace(trace_dwc3_gadget, "Stream %d found and started", event->parameters); break; case DEPEVT_STREAMEVT_NOTFOUND: /* FALLTHROUGH */ default: dwc3_trace(trace_dwc3_gadget, "unable to find suitable stream"); } break; case DWC3_DEPEVT_RXTXFIFOEVT: dwc3_trace(trace_dwc3_gadget, "%s FIFO Overrun", dep->name); break; case DWC3_DEPEVT_EPCMDCMPLT: dwc3_trace(trace_dwc3_gadget, "Endpoint Command Complete"); break; } } static void dwc3_disconnect_gadget(struct dwc3 *dwc) { if (dwc->gadget_driver && dwc->gadget_driver->disconnect) { spin_unlock(&dwc->lock); dwc->gadget_driver->disconnect(&dwc->gadget); spin_lock(&dwc->lock); } } static void dwc3_suspend_gadget(struct dwc3 *dwc) { if (dwc->gadget_driver && dwc->gadget_driver->suspend) { spin_unlock(&dwc->lock); dwc->gadget_driver->suspend(&dwc->gadget); spin_lock(&dwc->lock); } } static void dwc3_resume_gadget(struct dwc3 *dwc) { if (dwc->gadget_driver && dwc->gadget_driver->resume) { spin_unlock(&dwc->lock); dwc->gadget_driver->resume(&dwc->gadget); spin_lock(&dwc->lock); } } static void dwc3_reset_gadget(struct dwc3 *dwc) { if (!dwc->gadget_driver) return; if (dwc->gadget.speed != USB_SPEED_UNKNOWN) { spin_unlock(&dwc->lock); usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver); spin_lock(&dwc->lock); } } static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force) { struct dwc3_ep *dep; struct dwc3_gadget_ep_cmd_params params; u32 cmd; int ret; dep = dwc->eps[epnum]; if (!dep->resource_index) return; /* * NOTICE: We are violating what the Databook says about the * EndTransfer command. Ideally we would _always_ wait for the * EndTransfer Command Completion IRQ, but that's causing too * much trouble synchronizing between us and gadget driver. * * We have discussed this with the IP Provider and it was * suggested to giveback all requests here, but give HW some * extra time to synchronize with the interconnect. We're using * an arbitrary 100us delay for that. * * Note also that a similar handling was tested by Synopsys * (thanks a lot Paul) and nothing bad has come out of it. * In short, what we're doing is: * * - Issue EndTransfer WITH CMDIOC bit set * - Wait 100us */ cmd = DWC3_DEPCMD_ENDTRANSFER; cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0; cmd |= DWC3_DEPCMD_CMDIOC; cmd |= DWC3_DEPCMD_PARAM(dep->resource_index); memset(¶ms, 0, sizeof(params)); ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); WARN_ON_ONCE(ret); dep->resource_index = 0; dep->flags &= ~DWC3_EP_BUSY; udelay(100); } static void dwc3_stop_active_transfers(struct dwc3 *dwc) { u32 epnum; for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) { struct dwc3_ep *dep; dep = dwc->eps[epnum]; if (!dep) continue; if (!(dep->flags & DWC3_EP_ENABLED)) continue; dwc3_remove_requests(dwc, dep); } } static void dwc3_clear_stall_all_ep(struct dwc3 *dwc) { u32 epnum; for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) { struct dwc3_ep *dep; int ret; dep = dwc->eps[epnum]; if (!dep) continue; if (!(dep->flags & DWC3_EP_STALL)) continue; dep->flags &= ~DWC3_EP_STALL; ret = dwc3_send_clear_stall_ep_cmd(dep); WARN_ON_ONCE(ret); } } static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc) { int reg; reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~DWC3_DCTL_INITU1ENA; dwc3_writel(dwc->regs, DWC3_DCTL, reg); reg &= ~DWC3_DCTL_INITU2ENA; dwc3_writel(dwc->regs, DWC3_DCTL, reg); dwc3_disconnect_gadget(dwc); dwc->gadget.speed = USB_SPEED_UNKNOWN; dwc->setup_packet_pending = false; usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED); dwc->connected = false; } static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) { u32 reg; dwc->connected = true; /* * WORKAROUND: DWC3 revisions <1.88a have an issue which * would cause a missing Disconnect Event if there's a * pending Setup Packet in the FIFO. * * There's no suggested workaround on the official Bug * report, which states that "unless the driver/application * is doing any special handling of a disconnect event, * there is no functional issue". * * Unfortunately, it turns out that we _do_ some special * handling of a disconnect event, namely complete all * pending transfers, notify gadget driver of the * disconnection, and so on. * * Our suggested workaround is to follow the Disconnect * Event steps here, instead, based on a setup_packet_pending * flag. Such flag gets set whenever we have a SETUP_PENDING * status for EP0 TRBs and gets cleared on XferComplete for the * same endpoint. * * Refers to: * * STAR#9000466709: RTL: Device : Disconnect event not * generated if setup packet pending in FIFO */ if (dwc->revision < DWC3_REVISION_188A) { if (dwc->setup_packet_pending) dwc3_gadget_disconnect_interrupt(dwc); } dwc3_reset_gadget(dwc); reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~DWC3_DCTL_TSTCTRL_MASK; dwc3_writel(dwc->regs, DWC3_DCTL, reg); dwc->test_mode = false; dwc3_stop_active_transfers(dwc); dwc3_clear_stall_all_ep(dwc); /* Reset device address to zero */ reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg &= ~(DWC3_DCFG_DEVADDR_MASK); dwc3_writel(dwc->regs, DWC3_DCFG, reg); } static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed) { u32 reg; u32 usb30_clock = DWC3_GCTL_CLK_BUS; /* * We change the clock only at SS but I dunno why I would want to do * this. Maybe it becomes part of the power saving plan. */ if ((speed != DWC3_DSTS_SUPERSPEED) && (speed != DWC3_DSTS_SUPERSPEED_PLUS)) return; /* * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed * each time on Connect Done. */ if (!usb30_clock) return; reg = dwc3_readl(dwc->regs, DWC3_GCTL); reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock); dwc3_writel(dwc->regs, DWC3_GCTL, reg); } static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) { struct dwc3_ep *dep; int ret; u32 reg; u8 speed; reg = dwc3_readl(dwc->regs, DWC3_DSTS); speed = reg & DWC3_DSTS_CONNECTSPD; dwc->speed = speed; dwc3_update_ram_clk_sel(dwc, speed); switch (speed) { case DWC3_DSTS_SUPERSPEED_PLUS: dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); dwc->gadget.ep0->maxpacket = 512; dwc->gadget.speed = USB_SPEED_SUPER_PLUS; break; case DWC3_DSTS_SUPERSPEED: /* * WORKAROUND: DWC3 revisions <1.90a have an issue which * would cause a missing USB3 Reset event. * * In such situations, we should force a USB3 Reset * event by calling our dwc3_gadget_reset_interrupt() * routine. * * Refers to: * * STAR#9000483510: RTL: SS : USB3 reset event may * not be generated always when the link enters poll */ if (dwc->revision < DWC3_REVISION_190A) dwc3_gadget_reset_interrupt(dwc); dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); dwc->gadget.ep0->maxpacket = 512; dwc->gadget.speed = USB_SPEED_SUPER; break; case DWC3_DSTS_HIGHSPEED: dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64); dwc->gadget.ep0->maxpacket = 64; dwc->gadget.speed = USB_SPEED_HIGH; break; case DWC3_DSTS_FULLSPEED2: case DWC3_DSTS_FULLSPEED1: dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64); dwc->gadget.ep0->maxpacket = 64; dwc->gadget.speed = USB_SPEED_FULL; break; case DWC3_DSTS_LOWSPEED: dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8); dwc->gadget.ep0->maxpacket = 8; dwc->gadget.speed = USB_SPEED_LOW; break; } /* Enable USB2 LPM Capability */ if ((dwc->revision > DWC3_REVISION_194A) && (speed != DWC3_DSTS_SUPERSPEED) && (speed != DWC3_DSTS_SUPERSPEED_PLUS)) { reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg |= DWC3_DCFG_LPM_CAP; dwc3_writel(dwc->regs, DWC3_DCFG, reg); reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN); reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold); /* * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and * DCFG.LPMCap is set, core responses with an ACK and the * BESL value in the LPM token is less than or equal to LPM * NYET threshold. */ WARN_ONCE(dwc->revision < DWC3_REVISION_240A && dwc->has_lpm_erratum, "LPM Erratum not available on dwc3 revisisions < 2.40a\n"); if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A) reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold); dwc3_writel(dwc->regs, DWC3_DCTL, reg); } else { reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg &= ~DWC3_DCTL_HIRD_THRES_MASK; dwc3_writel(dwc->regs, DWC3_DCTL, reg); } dep = dwc->eps[0]; ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true, false); if (ret) { dev_err(dwc->dev, "failed to enable %s\n", dep->name); return; } dep = dwc->eps[1]; ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, true, false); if (ret) { dev_err(dwc->dev, "failed to enable %s\n", dep->name); return; } /* * Configure PHY via GUSB3PIPECTLn if required. * * Update GTXFIFOSIZn * * In both cases reset values should be sufficient. */ } static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc) { /* * TODO take core out of low power mode when that's * implemented. */ if (dwc->gadget_driver && dwc->gadget_driver->resume) { spin_unlock(&dwc->lock); dwc->gadget_driver->resume(&dwc->gadget); spin_lock(&dwc->lock); } } static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc, unsigned int evtinfo) { enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK; unsigned int pwropt; /* * WORKAROUND: DWC3 < 2.50a have an issue when configured without * Hibernation mode enabled which would show up when device detects * host-initiated U3 exit. * * In that case, device will generate a Link State Change Interrupt * from U3 to RESUME which is only necessary if Hibernation is * configured in. * * There are no functional changes due to such spurious event and we * just need to ignore it. * * Refers to: * * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation * operational mode */ pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1); if ((dwc->revision < DWC3_REVISION_250A) && (pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) { if ((dwc->link_state == DWC3_LINK_STATE_U3) && (next == DWC3_LINK_STATE_RESUME)) { dwc3_trace(trace_dwc3_gadget, "ignoring transition U3 -> Resume"); return; } } /* * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending * on the link partner, the USB session might do multiple entry/exit * of low power states before a transfer takes place. * * Due to this problem, we might experience lower throughput. The * suggested workaround is to disable DCTL[12:9] bits if we're * transitioning from U1/U2 to U0 and enable those bits again * after a transfer completes and there are no pending transfers * on any of the enabled endpoints. * * This is the first half of that workaround. * * Refers to: * * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us * core send LGO_Ux entering U0 */ if (dwc->revision < DWC3_REVISION_183A) { if (next == DWC3_LINK_STATE_U0) { u32 u1u2; u32 reg; switch (dwc->link_state) { case DWC3_LINK_STATE_U1: case DWC3_LINK_STATE_U2: reg = dwc3_readl(dwc->regs, DWC3_DCTL); u1u2 = reg & (DWC3_DCTL_INITU2ENA | DWC3_DCTL_ACCEPTU2ENA | DWC3_DCTL_INITU1ENA | DWC3_DCTL_ACCEPTU1ENA); if (!dwc->u1u2) dwc->u1u2 = reg & u1u2; reg &= ~u1u2; dwc3_writel(dwc->regs, DWC3_DCTL, reg); break; default: /* do nothing */ break; } } } switch (next) { case DWC3_LINK_STATE_U1: if (dwc->speed == USB_SPEED_SUPER) dwc3_suspend_gadget(dwc); break; case DWC3_LINK_STATE_U2: case DWC3_LINK_STATE_U3: dwc3_suspend_gadget(dwc); break; case DWC3_LINK_STATE_RESUME: dwc3_resume_gadget(dwc); break; default: /* do nothing */ break; } dwc->link_state = next; } static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc, unsigned int evtinfo) { enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK; if (dwc->link_state != next && next == DWC3_LINK_STATE_U3) dwc3_suspend_gadget(dwc); dwc->link_state = next; } static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc, unsigned int evtinfo) { unsigned int is_ss = evtinfo & BIT(4); /** * WORKAROUND: DWC3 revison 2.20a with hibernation support * have a known issue which can cause USB CV TD.9.23 to fail * randomly. * * Because of this issue, core could generate bogus hibernation * events which SW needs to ignore. * * Refers to: * * STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0 * Device Fallback from SuperSpeed */ if (is_ss ^ (dwc->speed == USB_SPEED_SUPER)) return; /* enter hibernation here */ } static void dwc3_gadget_interrupt(struct dwc3 *dwc, const struct dwc3_event_devt *event) { switch (event->type) { case DWC3_DEVICE_EVENT_DISCONNECT: dwc3_gadget_disconnect_interrupt(dwc); break; case DWC3_DEVICE_EVENT_RESET: dwc3_gadget_reset_interrupt(dwc); break; case DWC3_DEVICE_EVENT_CONNECT_DONE: dwc3_gadget_conndone_interrupt(dwc); break; case DWC3_DEVICE_EVENT_WAKEUP: dwc3_gadget_wakeup_interrupt(dwc); break; case DWC3_DEVICE_EVENT_HIBER_REQ: if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation, "unexpected hibernation event\n")) break; dwc3_gadget_hibernation_interrupt(dwc, event->event_info); break; case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE: dwc3_gadget_linksts_change_interrupt(dwc, event->event_info); break; case DWC3_DEVICE_EVENT_EOPF: /* It changed to be suspend event for version 2.30a and above */ if (dwc->revision < DWC3_REVISION_230A) { dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame"); } else { dwc3_trace(trace_dwc3_gadget, "U3/L1-L2 Suspend Event"); /* * Ignore suspend event until the gadget enters into * USB_STATE_CONFIGURED state. */ if (dwc->gadget.state >= USB_STATE_CONFIGURED) dwc3_gadget_suspend_interrupt(dwc, event->event_info); } break; case DWC3_DEVICE_EVENT_SOF: dwc3_trace(trace_dwc3_gadget, "Start of Periodic Frame"); break; case DWC3_DEVICE_EVENT_ERRATIC_ERROR: dwc3_trace(trace_dwc3_gadget, "Erratic Error"); break; case DWC3_DEVICE_EVENT_CMD_CMPL: dwc3_trace(trace_dwc3_gadget, "Command Complete"); break; case DWC3_DEVICE_EVENT_OVERFLOW: dwc3_trace(trace_dwc3_gadget, "Overflow"); break; default: dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type); } } static void dwc3_process_event_entry(struct dwc3 *dwc, const union dwc3_event *event) { trace_dwc3_event(event->raw); /* Endpoint IRQ, handle it and return early */ if (event->type.is_devspec == 0) { /* depevt */ return dwc3_endpoint_interrupt(dwc, &event->depevt); } switch (event->type.type) { case DWC3_EVENT_TYPE_DEV: dwc3_gadget_interrupt(dwc, &event->devt); break; /* REVISIT what to do with Carkit and I2C events ? */ default: dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw); } } static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt) { struct dwc3 *dwc = evt->dwc; irqreturn_t ret = IRQ_NONE; int left; u32 reg; left = evt->count; if (!(evt->flags & DWC3_EVENT_PENDING)) return IRQ_NONE; while (left > 0) { union dwc3_event event; event.raw = *(u32 *) (evt->buf + evt->lpos); dwc3_process_event_entry(dwc, &event); /* * FIXME we wrap around correctly to the next entry as * almost all entries are 4 bytes in size. There is one * entry which has 12 bytes which is a regular entry * followed by 8 bytes data. ATM I don't know how * things are organized if we get next to the a * boundary so I worry about that once we try to handle * that. */ evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE; left -= 4; dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 4); } evt->count = 0; evt->flags &= ~DWC3_EVENT_PENDING; ret = IRQ_HANDLED; /* Unmask interrupt */ reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0)); reg &= ~DWC3_GEVNTSIZ_INTMASK; dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg); return ret; } static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt) { struct dwc3_event_buffer *evt = _evt; struct dwc3 *dwc = evt->dwc; unsigned long flags; irqreturn_t ret = IRQ_NONE; spin_lock_irqsave(&dwc->lock, flags); ret = dwc3_process_event_buf(evt); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt) { struct dwc3 *dwc = evt->dwc; u32 count; u32 reg; if (pm_runtime_suspended(dwc->dev)) { pm_runtime_get(dwc->dev); disable_irq_nosync(dwc->irq_gadget); dwc->pending_events = true; return IRQ_HANDLED; } count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0)); count &= DWC3_GEVNTCOUNT_MASK; if (!count) return IRQ_NONE; evt->count = count; evt->flags |= DWC3_EVENT_PENDING; /* Mask interrupt */ reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0)); reg |= DWC3_GEVNTSIZ_INTMASK; dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg); return IRQ_WAKE_THREAD; } static irqreturn_t dwc3_interrupt(int irq, void *_evt) { struct dwc3_event_buffer *evt = _evt; return dwc3_check_event_buf(evt); } /** * dwc3_gadget_init - Initializes gadget related registers * @dwc: pointer to our controller context structure * * Returns 0 on success otherwise negative errno. */ int dwc3_gadget_init(struct dwc3 *dwc) { int ret, irq; struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); irq = platform_get_irq_byname(dwc3_pdev, "peripheral"); if (irq == -EPROBE_DEFER) return irq; if (irq <= 0) { irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3"); if (irq == -EPROBE_DEFER) return irq; if (irq <= 0) { irq = platform_get_irq(dwc3_pdev, 0); if (irq <= 0) { if (irq != -EPROBE_DEFER) { dev_err(dwc->dev, "missing peripheral IRQ\n"); } if (!irq) irq = -EINVAL; return irq; } } } dwc->irq_gadget = irq; dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req), &dwc->ctrl_req_addr, GFP_KERNEL); if (!dwc->ctrl_req) { dev_err(dwc->dev, "failed to allocate ctrl request\n"); ret = -ENOMEM; goto err0; } dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2, &dwc->ep0_trb_addr, GFP_KERNEL); if (!dwc->ep0_trb) { dev_err(dwc->dev, "failed to allocate ep0 trb\n"); ret = -ENOMEM; goto err1; } dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL); if (!dwc->setup_buf) { ret = -ENOMEM; goto err2; } dwc->ep0_bounce = dma_alloc_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr, GFP_KERNEL); if (!dwc->ep0_bounce) { dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n"); ret = -ENOMEM; goto err3; } dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL); if (!dwc->zlp_buf) { ret = -ENOMEM; goto err4; } dwc->gadget.ops = &dwc3_gadget_ops; dwc->gadget.speed = USB_SPEED_UNKNOWN; dwc->gadget.sg_supported = true; dwc->gadget.name = "dwc3-gadget"; dwc->gadget.is_otg = dwc->dr_mode == USB_DR_MODE_OTG; /* * FIXME We might be setting max_speed to revision < DWC3_REVISION_220A) dwc3_trace(trace_dwc3_gadget, "Changing max_speed on rev %08x", dwc->revision); dwc->gadget.max_speed = dwc->maximum_speed; /* * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize * on ep out. */ dwc->gadget.quirk_ep_out_aligned_size = true; /* * REVISIT: Here we should clear all pending IRQs to be * sure we're starting from a well known location. */ ret = dwc3_gadget_init_endpoints(dwc); if (ret) goto err5; ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget); if (ret) { dev_err(dwc->dev, "failed to register udc\n"); goto err5; } return 0; err5: kfree(dwc->zlp_buf); err4: dwc3_gadget_free_endpoints(dwc); dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE, dwc->ep0_bounce, dwc->ep0_bounce_addr); err3: kfree(dwc->setup_buf); err2: dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), dwc->ep0_trb, dwc->ep0_trb_addr); err1: dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req), dwc->ctrl_req, dwc->ctrl_req_addr); err0: return ret; } /* -------------------------------------------------------------------------- */ void dwc3_gadget_exit(struct dwc3 *dwc) { usb_del_gadget_udc(&dwc->gadget); dwc3_gadget_free_endpoints(dwc); dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE, dwc->ep0_bounce, dwc->ep0_bounce_addr); kfree(dwc->setup_buf); kfree(dwc->zlp_buf); dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), dwc->ep0_trb, dwc->ep0_trb_addr); dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req), dwc->ctrl_req, dwc->ctrl_req_addr); } int dwc3_gadget_suspend(struct dwc3 *dwc) { int ret; if (!dwc->gadget_driver) return 0; ret = dwc3_gadget_run_stop(dwc, false, false); if (ret < 0) return ret; dwc3_disconnect_gadget(dwc); __dwc3_gadget_stop(dwc); return 0; } int dwc3_gadget_resume(struct dwc3 *dwc) { int ret; if (!dwc->gadget_driver) return 0; ret = __dwc3_gadget_start(dwc); if (ret < 0) goto err0; ret = dwc3_gadget_run_stop(dwc, true, false); if (ret < 0) goto err1; return 0; err1: __dwc3_gadget_stop(dwc); err0: return ret; } void dwc3_gadget_process_pending_events(struct dwc3 *dwc) { if (dwc->pending_events) { dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf); dwc->pending_events = false; enable_irq(dwc->irq_gadget); } }