X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Fusb%2Fdwc3%2Fgadget.c;h=3399679513a8a310ca50156cce5642ea4572004a;hb=HEAD;hp=fb79dca9484b5afed9318e15c0859e43dbc99718;hpb=d2d693d1ba7d93ec7c5db8aca2da29a4c91f6782;p=firefly-linux-kernel-4.4.55.git diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index fb79dca9484b..3399679513a8 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -146,89 +146,28 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state) } /** - * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case - * @dwc: pointer to our context structure - * - * This function will a best effort FIFO allocation in order - * to improve FIFO usage and throughput, while still allowing - * us to enable as many endpoints as possible. - * - * Keep in mind that this operation will be highly dependent - * on the configured size for RAM1 - which contains TxFifo -, - * the amount of endpoints enabled on coreConsultant tool, and - * the width of the Master Bus. - * - * In the ideal world, we would always be able to satisfy the - * following equation: + * dwc3_ep_inc_trb() - Increment a TRB index. + * @index - Pointer to the TRB index to increment. * - * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \ - * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes - * - * Unfortunately, due to many variables that's not always the case. + * 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. */ -int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc) +static void dwc3_ep_inc_trb(u8 *index) { - int last_fifo_depth = 0; - int ram1_depth; - int fifo_size; - int mdwidth; - int num; - - if (!dwc->needs_fifo_resize) - return 0; - - ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); - mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0); - - /* MDWIDTH is represented in bits, we need it in bytes */ - mdwidth >>= 3; - - /* - * FIXME For now we will only allocate 1 wMaxPacketSize space - * for each enabled endpoint, later patches will come to - * improve this algorithm so that we better use the internal - * FIFO space - */ - for (num = 0; num < dwc->num_in_eps; num++) { - /* bit0 indicates direction; 1 means IN ep */ - struct dwc3_ep *dep = dwc->eps[(num << 1) | 1]; - int mult = 1; - int tmp; - - if (!(dep->flags & DWC3_EP_ENABLED)) - continue; - - if (usb_endpoint_xfer_bulk(dep->endpoint.desc) - || usb_endpoint_xfer_isoc(dep->endpoint.desc)) - mult = 3; - - /* - * REVISIT: the following assumes we will always have enough - * space available on the FIFO RAM for all possible use cases. - * Make sure that's true somehow and change FIFO allocation - * accordingly. - * - * If we have Bulk or Isochronous endpoints, we want - * them to be able to be very, very fast. So we're giving - * those endpoints a fifo_size which is enough for 3 full - * packets - */ - tmp = mult * (dep->endpoint.maxpacket + mdwidth); - tmp += mdwidth; - - fifo_size = DIV_ROUND_UP(tmp, mdwidth); - - fifo_size |= (last_fifo_depth << 16); - - dwc3_trace(trace_dwc3_gadget, "%s: Fifo Addr %04x Size %d", - dep->name, last_fifo_depth, fifo_size & 0xffff); - - dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size); + (*index)++; + if (*index == (DWC3_TRB_NUM - 1)) + *index = 0; +} - last_fifo_depth += (fifo_size & 0xffff); - } +static void dwc3_ep_inc_enq(struct dwc3_ep *dep) +{ + dwc3_ep_inc_trb(&dep->trb_enqueue); +} - return 0; +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, @@ -237,21 +176,12 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, struct dwc3 *dwc = dep->dwc; int i; - if (req->queued) { + if (req->started) { i = 0; do { - dep->busy_slot++; - /* - * Skip LINK TRB. We can't use req->trb and check for - * DWC3_TRBCTL_LINK_TRB because it points the TRB we - * just completed (not the LINK TRB). - */ - if (((dep->busy_slot & DWC3_TRB_MASK) == - DWC3_TRB_NUM- 1) && - usb_endpoint_xfer_isoc(dep->endpoint.desc)) - dep->busy_slot++; + dwc3_ep_inc_deq(dep); } while(++i < req->request.num_mapped_sgs); - req->queued = false; + req->started = false; } list_del(&req->list); req->trb = NULL; @@ -259,95 +189,171 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, if (req->request.status == -EINPROGRESS) req->request.status = status; - if (dwc->ep0_bounced && dep->number == 0) + if (dwc->ep0_bounced && dep->number <= 1) dwc->ep0_bounced = false; - else - usb_gadget_unmap_request(&dwc->gadget, &req->request, - req->direction); - dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n", - req, dep->name, req->request.actual, - req->request.length, status); + 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; - trace_dwc3_gadget_generic_cmd(cmd, param); - 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)) { - dwc3_trace(trace_dwc3_gadget, - "Command Complete --> %d", - DWC3_DGCMD_STATUS(reg)); - if (DWC3_DGCMD_STATUS(reg)) - return -EINVAL; - return 0; + status = DWC3_DGCMD_STATUS(reg); + if (status) + ret = -EINVAL; + break; } + } while (timeout--); - /* - * We can't sleep here, because it's also called from - * interrupt context. - */ - timeout--; - if (!timeout) { - dwc3_trace(trace_dwc3_gadget, - "Command Timed Out"); - return -ETIMEDOUT; - } - udelay(1); - } while (1); + if (!timeout) { + ret = -ETIMEDOUT; + status = -ETIMEDOUT; + } + + trace_dwc3_gadget_generic_cmd(cmd, param, status); + + return ret; } -int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep, - unsigned cmd, struct dwc3_gadget_ep_cmd_params *params) +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_ep *dep = dwc->eps[ep]; + struct dwc3 *dwc = dep->dwc; u32 timeout = 500; u32 reg; - trace_dwc3_gadget_ep_cmd(dep, cmd, params); + 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); - dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0); - dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1); - dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2); + if (unlikely(needs_wakeup)) { + ret = __dwc3_gadget_wakeup(dwc); + dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", + ret); + } + } - dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT); + 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(dwc->regs, DWC3_DEPCMD(ep)); + reg = dwc3_readl(dep->regs, DWC3_DEPCMD); if (!(reg & DWC3_DEPCMD_CMDACT)) { - dwc3_trace(trace_dwc3_gadget, - "Command Complete --> %d", - DWC3_DEPCMD_STATUS(reg)); - if (DWC3_DEPCMD_STATUS(reg)) - return -EINVAL; - return 0; - } + cmd_status = DWC3_DEPCMD_STATUS(reg); - /* - * We can't sleep here, because it is also called from - * interrupt context. - */ - timeout--; - if (!timeout) { - dwc3_trace(trace_dwc3_gadget, - "Command Timed Out"); - return -ETIMEDOUT; + 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); - udelay(1); - } while (1); + 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, @@ -435,7 +441,7 @@ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep) memset(¶ms, 0x00, sizeof(params)); cmd = DWC3_DEPCMD_DEPSTARTCFG; - ret = dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms); + ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); if (ret) return ret; @@ -456,28 +462,32 @@ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep) 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 ignore, bool restore) + 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 - 1; - - params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst); + if (dwc->gadget.speed >= USB_SPEED_SUPER) { + u32 burst = dep->endpoint.maxburst; + params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1); } - if (ignore) - params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM; - - if (restore) { + 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 @@ -512,8 +522,7 @@ static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep, dep->interval = 1 << (desc->bInterval - 1); } - return dwc3_send_gadget_ep_cmd(dwc, dep->number, - DWC3_DEPCMD_SETEPCONFIG, ¶ms); + 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) @@ -524,8 +533,8 @@ static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep) params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1); - return dwc3_send_gadget_ep_cmd(dwc, dep->number, - DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms); + return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE, + ¶ms); } /** @@ -538,7 +547,7 @@ static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep) 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 ignore, bool restore) + bool modify, bool restore) { struct dwc3 *dwc = dep->dwc; u32 reg; @@ -552,7 +561,7 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, return ret; } - ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore, + ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, modify, restore); if (ret) return ret; @@ -570,38 +579,25 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, reg |= DWC3_DALEPENA_EP(dep->number); dwc3_writel(dwc->regs, DWC3_DALEPENA, reg); - if (!usb_endpoint_xfer_isoc(desc)) + if (usb_endpoint_xfer_control(desc)) return 0; - /* Link TRB for ISOC. The HWO bit is never reset */ + /* 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]; - memset(trb_link, 0, sizeof(*trb_link)); - 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; } - switch (usb_endpoint_type(desc)) { - case USB_ENDPOINT_XFER_CONTROL: - strlcat(dep->name, "-control", sizeof(dep->name)); - break; - case USB_ENDPOINT_XFER_ISOC: - strlcat(dep->name, "-isoc", sizeof(dep->name)); - break; - case USB_ENDPOINT_XFER_BULK: - strlcat(dep->name, "-bulk", sizeof(dep->name)); - break; - case USB_ENDPOINT_XFER_INT: - strlcat(dep->name, "-int", sizeof(dep->name)); - break; - default: - dev_err(dwc->dev, "invalid endpoint transfer type\n"); - } - return 0; } @@ -610,19 +606,17 @@ static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_request *req; - if (!list_empty(&dep->req_queued)) { - dwc3_stop_active_transfer(dwc, dep->number, true); + dwc3_stop_active_transfer(dwc, dep->number, true); - /* - giveback all requests to gadget driver */ - while (!list_empty(&dep->req_queued)) { - req = next_request(&dep->req_queued); + /* - giveback all requests to gadget driver */ + while (!list_empty(&dep->started_list)) { + req = next_request(&dep->started_list); - dwc3_gadget_giveback(dep, req, -ESHUTDOWN); - } + dwc3_gadget_giveback(dep, req, -ESHUTDOWN); } - while (!list_empty(&dep->request_list)) { - req = next_request(&dep->request_list); + while (!list_empty(&dep->pending_list)) { + req = next_request(&dep->pending_list); dwc3_gadget_giveback(dep, req, -ESHUTDOWN); } @@ -659,10 +653,6 @@ static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep) dep->type = 0; dep->flags = 0; - snprintf(dep->name, sizeof(dep->name), "ep%d%s", - dep->number >> 1, - (dep->number & 1) ? "in" : "out"); - return 0; } @@ -702,11 +692,10 @@ static int dwc3_gadget_ep_enable(struct usb_ep *ep, dep = to_dwc3_ep(ep); dwc = dep->dwc; - if (dep->flags & DWC3_EP_ENABLED) { - dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n", - dep->name); + 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); @@ -730,11 +719,10 @@ static int dwc3_gadget_ep_disable(struct usb_ep *ep) dep = to_dwc3_ep(ep); dwc = dep->dwc; - if (!(dep->flags & DWC3_EP_ENABLED)) { - dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n", - dep->name); + 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); @@ -756,6 +744,8 @@ static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep, req->epnum = dep->number; req->dep = dep; + dep->allocated_requests++; + trace_dwc3_alloc_request(req); return &req->request; @@ -765,7 +755,9 @@ 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); } @@ -787,20 +779,16 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, chain ? " chain" : ""); - trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK]; + trb = &dep->trb_pool[dep->trb_enqueue]; if (!req->trb) { - dwc3_gadget_move_request_queued(req); + dwc3_gadget_move_started_request(req); req->trb = trb; req->trb_dma = dwc3_trb_dma_offset(dep, trb); - req->start_slot = dep->free_slot & DWC3_TRB_MASK; + req->first_trb_index = dep->trb_enqueue; } - dep->free_slot++; - /* Skip the LINK-TRB on ISOC */ - if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) && - usb_endpoint_xfer_isoc(dep->endpoint.desc)) - dep->free_slot++; + dwc3_ep_inc_enq(dep); trb->size = DWC3_TRB_SIZE_LENGTH(length); trb->bpl = lower_32_bits(dma); @@ -816,6 +804,9 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, 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: @@ -830,15 +821,14 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, 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; + trb->ctrl |= DWC3_TRB_CTRL_IOC | DWC3_TRB_CTRL_ISP_IMI; - if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI; - trb->ctrl |= DWC3_TRB_CTRL_CSP; - } else if (last) { + if (last) trb->ctrl |= DWC3_TRB_CTRL_LST; - } if (chain) trb->ctrl |= DWC3_TRB_CTRL_CHN; @@ -848,163 +838,173 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, trb->ctrl |= DWC3_TRB_CTRL_HWO; + dep->queued_requests++; + trace_dwc3_prepare_trb(dep, trb); } -/* - * dwc3_prepare_trbs - setup TRBs from requests - * @dep: endpoint for which requests are being prepared - * @starting: true if the endpoint is idle and no requests are queued. +/** + * 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 * - * 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. + * 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 void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting) +static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index) { - struct dwc3_request *req, *n; - u32 trbs_left; - u32 max; - unsigned int last_one = 0; - - BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); + if (!index) + index = DWC3_TRB_NUM - 2; + else + index = dep->trb_enqueue - 1; - /* the first request must not be queued */ - trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK; + return &dep->trb_pool[index]; +} - /* Can't wrap around on a non-isoc EP since there's no link TRB */ - if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK); - if (trbs_left > max) - trbs_left = max; - } +static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep) +{ + struct dwc3_trb *tmp; + u8 trbs_left; /* - * If busy & slot are equal than it is either full or empty. If we are - * starting to process requests then we are empty. Otherwise we are - * full and don't do anything + * 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 (!trbs_left) { - if (!starting) - return; - trbs_left = DWC3_TRB_NUM; - /* - * In case we start from scratch, we queue the ISOC requests - * starting from slot 1. This is done because we use ring - * buffer and have no LST bit to stop us. Instead, we place - * IOC bit every TRB_NUM/4. We try to avoid having an interrupt - * after the first request so we start at slot 1 and have - * 7 requests proceed before we hit the first IOC. - * Other transfer types don't use the ring buffer and are - * processed from the first TRB until the last one. Since we - * don't wrap around we have to start at the beginning. - */ - if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - dep->busy_slot = 1; - dep->free_slot = 1; - } else { - dep->busy_slot = 0; - dep->free_slot = 0; - } + if (dep->trb_enqueue == dep->trb_dequeue) { + tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue); + + if (!(tmp->ctrl & DWC3_TRB_CTRL_HWO) || + ((tmp->ctrl & DWC3_TRB_CTRL_HWO) && + (tmp->ctrl & DWC3_TRB_CTRL_CSP) && + !dep->direction)) + return DWC3_TRB_NUM - 1; + + return 0; } - /* The last TRB is a link TRB, not used for xfer */ - if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc)) - return; + trbs_left = dep->trb_dequeue - dep->trb_enqueue; + trbs_left &= (DWC3_TRB_NUM - 1); - list_for_each_entry_safe(req, n, &dep->request_list, list) { - unsigned length; - dma_addr_t dma; - last_one = false; + if (dep->trb_dequeue < dep->trb_enqueue) + trbs_left--; - if (req->request.num_mapped_sgs > 0) { - struct usb_request *request = &req->request; - struct scatterlist *sg = request->sg; - struct scatterlist *s; - int i; + return trbs_left; +} - for_each_sg(sg, s, request->num_mapped_sgs, i) { - unsigned chain = true; +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; - length = sg_dma_len(s); - dma = sg_dma_address(s); + for_each_sg(sg, s, request->num_mapped_sgs, i) { + unsigned chain = true; - if (i == (request->num_mapped_sgs - 1) || - sg_is_last(s)) { - if (list_empty(&dep->request_list)) - last_one = true; - chain = false; - } + length = sg_dma_len(s); + dma = sg_dma_address(s); - trbs_left--; - if (!trbs_left) - last_one = true; + if (sg_is_last(s)) { + if (usb_endpoint_xfer_int(dep->endpoint.desc) || + !more_coming) + last = true; - if (last_one) - chain = false; + chain = false; + } - dwc3_prepare_one_trb(dep, req, dma, length, - last_one, chain, i); + if (!trbs_left--) + last = true; - if (last_one) - break; - } + if (last) + chain = false; - if (last_one) - break; - } else { - dma = req->request.dma; - length = req->request.length; - trbs_left--; + dwc3_prepare_one_trb(dep, req, dma, length, + last, chain, i); + + if (last) + break; + } +} - if (!trbs_left) - last_one = 1; +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; - /* Is this the last request? */ - if (list_is_last(&req->list, &dep->request_list)) - last_one = 1; + dma = req->request.dma; + length = req->request.length; - dwc3_prepare_one_trb(dep, req, dma, length, - last_one, false, 0); + if (!trbs_left) + last = true; - if (last_one) - break; - } + /* 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, - int start_new) +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; - if (start_new && (dep->flags & DWC3_EP_BUSY)) { - dwc3_trace(trace_dwc3_gadget, "%s: endpoint busy", dep->name); - return -EBUSY; - } + starting = !(dep->flags & DWC3_EP_BUSY); - /* - * If we are getting here after a short-out-packet we don't enqueue any - * new requests as we try to set the IOC bit only on the last request. - */ - if (start_new) { - if (list_empty(&dep->req_queued)) - dwc3_prepare_trbs(dep, start_new); - - /* req points to the first request which will be sent */ - req = next_request(&dep->req_queued); - } else { - dwc3_prepare_trbs(dep, start_new); - - /* - * req points to the first request where HWO changed from 0 to 1 - */ - req = next_request(&dep->req_queued); - } + dwc3_prepare_trbs(dep); + req = next_request(&dep->started_list); if (!req) { dep->flags |= DWC3_EP_PENDING_REQUEST; return 0; @@ -1012,19 +1012,18 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param, memset(¶ms, 0, sizeof(params)); - if (start_new) { + if (starting) { params.param0 = upper_32_bits(req->trb_dma); params.param1 = lower_32_bits(req->trb_dma); - cmd = DWC3_DEPCMD_STARTTRANSFER; + cmd = DWC3_DEPCMD_STARTTRANSFER | + DWC3_DEPCMD_PARAM(cmd_param); } else { - cmd = DWC3_DEPCMD_UPDATETRANSFER; + cmd = DWC3_DEPCMD_UPDATETRANSFER | + DWC3_DEPCMD_PARAM(dep->resource_index); } - cmd |= DWC3_DEPCMD_PARAM(cmd_param); - ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms); + ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); if (ret < 0) { - dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n"); - /* * FIXME we need to iterate over the list of requests * here and stop, unmap, free and del each of the linked @@ -1038,9 +1037,8 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param, dep->flags |= DWC3_EP_BUSY; - if (start_new) { - dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc, - dep->number); + if (starting) { + dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep); WARN_ON_ONCE(!dep->resource_index); } @@ -1052,7 +1050,7 @@ static void __dwc3_gadget_start_isoc(struct dwc3 *dwc, { u32 uf; - if (list_empty(&dep->request_list)) { + if (list_empty(&dep->pending_list)) { dwc3_trace(trace_dwc3_gadget, "ISOC ep %s run out for requests", dep->name); @@ -1063,7 +1061,7 @@ static void __dwc3_gadget_start_isoc(struct dwc3 *dwc, /* 4 micro frames in the future */ uf = cur_uf + dep->interval * 4; - __dwc3_gadget_kick_transfer(dep, uf, 1); + __dwc3_gadget_kick_transfer(dep, uf); } static void dwc3_gadget_start_isoc(struct dwc3 *dwc, @@ -1082,6 +1080,22 @@ 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; @@ -1089,6 +1103,17 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) trace_dwc3_ep_queue(req); + /* + * Per databook, the total size of buffer must be a multiple + * of MaxPacketSize for OUT endpoints. And MaxPacketSize is + * configed for endpoints in dwc3_gadget_set_ep_config(), + * set to usb_endpoint_descriptor->wMaxPacketSize. + */ + if (dep->direction == 0 && + req->request.length % dep->endpoint.desc->wMaxPacketSize) + req->request.length = roundup(req->request.length, + dep->endpoint.desc->wMaxPacketSize); + /* * We only add to our list of requests now and * start consuming the list once we get XferNotReady @@ -1106,7 +1131,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) if (ret) return ret; - list_add_tail(&req->list, &dep->request_list); + list_add_tail(&req->list, &dep->pending_list); /* * If there are no pending requests and the endpoint isn't already @@ -1116,9 +1141,8 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) * little bit faster. */ if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) && - !usb_endpoint_xfer_int(dep->endpoint.desc) && - !(dep->flags & DWC3_EP_BUSY)) { - ret = __dwc3_gadget_kick_transfer(dep, 0, true); + !usb_endpoint_xfer_int(dep->endpoint.desc)) { + ret = __dwc3_gadget_kick_transfer(dep, 0); goto out; } @@ -1141,14 +1165,14 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) * notion of current microframe. */ if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - if (list_empty(&dep->req_queued)) { + 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, true); + ret = __dwc3_gadget_kick_transfer(dep, 0); if (!ret) dep->flags &= ~DWC3_EP_PENDING_REQUEST; @@ -1164,8 +1188,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) (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, - false); + ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index); goto out; } @@ -1175,11 +1198,12 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) * handled. */ if (dep->stream_capable) - ret = __dwc3_gadget_kick_transfer(dep, 0, true); + ret = __dwc3_gadget_kick_transfer(dep, 0); out: if (ret && ret != -EBUSY) - dev_dbg(dwc->dev, "%s: failed to kick transfers\n", + dwc3_trace(trace_dwc3_gadget, + "%s: failed to kick transfers", dep->name); if (ret == -EBUSY) ret = 0; @@ -1187,6 +1211,32 @@ out: 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) { @@ -1199,22 +1249,18 @@ static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, int ret; spin_lock_irqsave(&dwc->lock, flags); - if (!dep->endpoint.desc) { - dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n", - request, ep->name); - ret = -ESHUTDOWN; - goto out; - } - - if (WARN(req->dep != dep, "request %p belongs to '%s'\n", - request, req->dep->name)) { - ret = -EINVAL; - goto out; - } - ret = __dwc3_gadget_ep_queue(dep, req); -out: + /* + * 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->desc->wMaxPacketSize == 0)) + ret = __dwc3_gadget_ep_queue_zlp(dwc, dep); + spin_unlock_irqrestore(&dwc->lock, flags); return ret; @@ -1236,13 +1282,13 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep, spin_lock_irqsave(&dwc->lock, flags); - list_for_each_entry(r, &dep->request_list, list) { + list_for_each_entry(r, &dep->pending_list, list) { if (r == req) break; } if (r != req) { - list_for_each_entry(r, &dep->req_queued, list) { + list_for_each_entry(r, &dep->started_list, list) { if (r == req) break; } @@ -1281,24 +1327,37 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol) memset(¶ms, 0x00, sizeof(params)); if (value) { - if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) || - (!list_empty(&dep->req_queued) || - !list_empty(&dep->request_list)))) { - dev_dbg(dwc->dev, "%s: pending request, cannot halt\n", + 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(dwc, dep->number, - DWC3_DEPCMD_SETSTALL, ¶ms); + 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_gadget_ep_cmd(dwc, dep->number, - DWC3_DEPCMD_CLEARSTALL, ¶ms); + + ret = dwc3_send_clear_stall_ep_cmd(dep); if (ret) dev_err(dwc->dev, "failed to clear STALL on %s\n", dep->name); @@ -1385,22 +1444,16 @@ static int dwc3_gadget_get_frame(struct usb_gadget *g) return DWC3_DSTS_SOFFN(reg); } -static int dwc3_gadget_wakeup(struct usb_gadget *g) +static int __dwc3_gadget_wakeup(struct dwc3 *dwc) { - struct dwc3 *dwc = gadget_to_dwc(g); - unsigned long timeout; - unsigned long flags; + int ret; u32 reg; - int ret = 0; - u8 link_state; u8 speed; - spin_lock_irqsave(&dwc->lock, flags); - /* * According to the Databook Remote wakeup request should * be issued only when the device is in early suspend state. @@ -1411,9 +1464,8 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) speed = reg & DWC3_DSTS_CONNECTSPD; if (speed == DWC3_DSTS_SUPERSPEED) { - dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n"); - ret = -EINVAL; - goto out; + dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed"); + return 0; } link_state = DWC3_DSTS_USBLNKST(reg); @@ -1423,16 +1475,16 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */ break; default: - dev_dbg(dwc->dev, "can't wakeup from link state %d\n", - link_state); - ret = -EINVAL; - goto out; + 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"); - goto out; + return ret; } /* Recent versions do this automatically */ @@ -1456,10 +1508,20 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) { dev_err(dwc->dev, "failed to send remote wakeup\n"); - ret = -EINVAL; + return -EINVAL; } -out: + 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; @@ -1483,6 +1545,9 @@ 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) { @@ -1511,18 +1576,11 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend) do { reg = dwc3_readl(dwc->regs, DWC3_DSTS); - if (is_on) { - if (!(reg & DWC3_DSTS_DEVCTRLHLT)) - break; - } else { - if (reg & DWC3_DSTS_DEVCTRLHLT) - break; - } - timeout--; - if (!timeout) - return -ETIMEDOUT; - udelay(1); - } while (1); + 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 @@ -1574,36 +1632,52 @@ static void dwc3_gadget_disable_irq(struct dwc3 *dwc) static irqreturn_t dwc3_interrupt(int irq, void *_dwc); static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc); -static int dwc3_gadget_start(struct usb_gadget *g, - struct usb_gadget_driver *driver) +/** + * 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) { - struct dwc3 *dwc = gadget_to_dwc(g); - struct dwc3_ep *dep; - unsigned long flags; - int ret = 0; - int irq; - u32 reg; + u32 ram2_depth; + u32 mdwidth; + u32 nump; + u32 reg; - irq = platform_get_irq(to_platform_device(dwc->dev), 0); - ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt, - IRQF_SHARED, "dwc3", dwc); - if (ret) { - dev_err(dwc->dev, "failed to request irq #%d --> %d\n", - irq, ret); - goto err0; - } + ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7); + mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0); - spin_lock_irqsave(&dwc->lock, flags); + nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024; + nump = min_t(u32, nump, 16); - 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; - } + /* 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); +} - dwc->gadget_driver = driver; +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); @@ -1626,22 +1700,35 @@ static int dwc3_gadget_start(struct usb_gadget *g, } else { switch (dwc->maximum_speed) { case USB_SPEED_LOW: - reg |= DWC3_DSTS_LOWSPEED; + reg |= DWC3_DCFG_LOWSPEED; break; case USB_SPEED_FULL: - reg |= DWC3_DSTS_FULLSPEED1; + reg |= DWC3_DCFG_FULLSPEED1; break; case USB_SPEED_HIGH: - reg |= DWC3_DSTS_HIGHSPEED; + reg |= DWC3_DCFG_HIGHSPEED; break; case USB_SPEED_SUPER: /* FALLTHROUGH */ case USB_SPEED_UNKNOWN: /* FALTHROUGH */ default: - reg |= DWC3_DSTS_SUPERSPEED; + reg |= DWC3_DCFG_SUPERSPEED; } } 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); @@ -1650,7 +1737,7 @@ static int dwc3_gadget_start(struct usb_gadget *g, false); if (ret) { dev_err(dwc->dev, "failed to enable %s\n", dep->name); - goto err2; + goto err0; } dep = dwc->eps[1]; @@ -1658,7 +1745,7 @@ static int dwc3_gadget_start(struct usb_gadget *g, false); if (ret) { dev_err(dwc->dev, "failed to enable %s\n", dep->name); - goto err3; + goto err1; } /* begin to receive SETUP packets */ @@ -1667,43 +1754,79 @@ static int dwc3_gadget_start(struct usb_gadget *g, dwc3_gadget_enable_irq(dwc); - spin_unlock_irqrestore(&dwc->lock, flags); - return 0; -err3: - __dwc3_gadget_ep_disable(dwc->eps[0]); - -err2: - dwc->gadget_driver = NULL; - err1: - spin_unlock_irqrestore(&dwc->lock, flags); - - free_irq(irq, dwc); + __dwc3_gadget_ep_disable(dwc->eps[0]); err0: return ret; } -static int dwc3_gadget_stop(struct usb_gadget *g) +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]); +} - dwc->gadget_driver = NULL; +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); - irq = platform_get_irq(to_platform_device(dwc->dev), 0); - free_irq(irq, dwc); + free_irq(dwc->irq_gadget, dwc->ev_buf); return 0; } @@ -1726,7 +1849,7 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc, u8 i; for (i = 0; i < num; i++) { - u8 epnum = (i << 1) | (!!direction); + u8 epnum = (i << 1) | (direction ? 1 : 0); dep = kzalloc(sizeof(*dep), GFP_KERNEL); if (!dep) @@ -1735,12 +1858,14 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc, 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); @@ -1775,8 +1900,8 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc, dep->endpoint.caps.dir_in = !!direction; dep->endpoint.caps.dir_out = !direction; - INIT_LIST_HEAD(&dep->request_list); - INIT_LIST_HEAD(&dep->req_queued); + INIT_LIST_HEAD(&dep->pending_list); + INIT_LIST_HEAD(&dep->started_list); } return 0; @@ -1842,6 +1967,7 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep, unsigned int s_pkt = 0; unsigned int trb_status; + dep->queued_requests--; trace_dwc3_complete_trb(dep, trb); if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN) @@ -1861,7 +1987,8 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep, if (count) { trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size); if (trb_status == DWC3_TRBSTS_MISSED_ISOC) { - dev_dbg(dwc->dev, "incomplete IN transfer %s\n", + dwc3_trace(trace_dwc3_gadget, + "%s: incomplete IN transfer", dep->name); /* * If missed isoc occurred and there is @@ -1872,11 +1999,11 @@ static int __dwc3_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep, * If there are still queued request * then wait, do not issue either END * or UPDATE TRANSFER, just attach next - * request in request_list during + * 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 request_list. + * request in the pending_list. */ dep->flags |= DWC3_EP_MISSED_ISOC; } else { @@ -1915,16 +2042,14 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, int ret; do { - req = next_request(&dep->req_queued); - if (!req) { - WARN_ON_ONCE(1); + req = next_request(&dep->started_list); + if (WARN_ON_ONCE(!req)) return 1; - } + i = 0; do { - slot = req->start_slot + i; - if ((slot == DWC3_TRB_NUM - 1) && - usb_endpoint_xfer_isoc(dep->endpoint.desc)) + slot = req->first_trb_index + i; + if (slot == DWC3_TRB_NUM - 1) slot++; slot %= DWC3_TRB_NUM; trb = &dep->trb_pool[slot]; @@ -1951,9 +2076,17 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, 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->req_queued)) { - if (list_empty(&dep->request_list)) { + 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 @@ -1988,7 +2121,7 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc, status = -ECONNRESET; clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status); - if (clean_busy && (is_xfer_complete || + if (clean_busy && (!dep->endpoint.desc || is_xfer_complete || usb_endpoint_xfer_isoc(dep->endpoint.desc))) dep->flags &= ~DWC3_EP_BUSY; @@ -2006,7 +2139,7 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc, if (!(dep->flags & DWC3_EP_ENABLED)) continue; - if (!list_empty(&dep->req_queued)) + if (!list_empty(&dep->started_list)) return; } @@ -2017,10 +2150,18 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc, 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, is_xfer_complete); + ret = __dwc3_gadget_kick_transfer(dep, 0); if (!ret || ret == -EBUSY) return; } @@ -2038,6 +2179,9 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc, return; if (epnum == 0 || epnum == 1) { + if (!dwc->connected && + event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE) + dwc->connected = true; dwc3_ep0_interrupt(dwc, event); return; } @@ -2047,7 +2191,8 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc, dep->resource_index = 0; if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n", + dwc3_trace(trace_dwc3_gadget, + "%s is an Isochronous endpoint", dep->name); return; } @@ -2070,11 +2215,12 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc, dep->name, active ? "Transfer Active" : "Transfer Not Active"); - ret = __dwc3_gadget_kick_transfer(dep, 0, !active); + ret = __dwc3_gadget_kick_transfer(dep, 0); if (!ret || ret == -EBUSY) return; - dev_dbg(dwc->dev, "%s: failed to kick transfers\n", + dwc3_trace(trace_dwc3_gadget, + "%s: failed to kick transfers", dep->name); } @@ -2096,11 +2242,12 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc, case DEPEVT_STREAMEVT_NOTFOUND: /* FALLTHROUGH */ default: - dev_dbg(dwc->dev, "Couldn't find suitable stream\n"); + dwc3_trace(trace_dwc3_gadget, + "unable to find suitable stream"); } break; case DWC3_DEPEVT_RXTXFIFOEVT: - dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name); + dwc3_trace(trace_dwc3_gadget, "%s FIFO Overrun", dep->name); break; case DWC3_DEPEVT_EPCMDCMPLT: dwc3_trace(trace_dwc3_gadget, "Endpoint Command Complete"); @@ -2183,7 +2330,7 @@ static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force) cmd |= DWC3_DEPCMD_CMDIOC; cmd |= DWC3_DEPCMD_PARAM(dep->resource_index); memset(¶ms, 0, sizeof(params)); - ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms); + ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); WARN_ON_ONCE(ret); dep->resource_index = 0; dep->flags &= ~DWC3_EP_BUSY; @@ -2214,7 +2361,6 @@ static void dwc3_clear_stall_all_ep(struct dwc3 *dwc) for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) { struct dwc3_ep *dep; - struct dwc3_gadget_ep_cmd_params params; int ret; dep = dwc->eps[epnum]; @@ -2226,9 +2372,7 @@ static void dwc3_clear_stall_all_ep(struct dwc3 *dwc) dep->flags &= ~DWC3_EP_STALL; - memset(¶ms, 0, sizeof(params)); - ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, - DWC3_DEPCMD_CLEARSTALL, ¶ms); + ret = dwc3_send_clear_stall_ep_cmd(dep); WARN_ON_ONCE(ret); } } @@ -2249,6 +2393,8 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *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) @@ -2272,8 +2418,8 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) * * 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 XferNotReady - * event on EP0 and gets cleared on XferComplete for the + * 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: @@ -2341,7 +2487,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) dwc3_update_ram_clk_sel(dwc, speed); switch (speed) { - case DWC3_DCFG_SUPERSPEED: + case DWC3_DSTS_SUPERSPEED: /* * WORKAROUND: DWC3 revisions <1.90a have an issue which * would cause a missing USB3 Reset event. @@ -2362,18 +2508,18 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) dwc->gadget.ep0->maxpacket = 512; dwc->gadget.speed = USB_SPEED_SUPER; break; - case DWC3_DCFG_HIGHSPEED: + 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_DCFG_FULLSPEED2: - case DWC3_DCFG_FULLSPEED1: + 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_DCFG_LOWSPEED: + case DWC3_DSTS_LOWSPEED: dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8); dwc->gadget.ep0->maxpacket = 8; dwc->gadget.speed = USB_SPEED_LOW; @@ -2382,8 +2528,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) /* Enable USB2 LPM Capability */ - if ((dwc->revision > DWC3_REVISION_194A) - && (speed != DWC3_DCFG_SUPERSPEED)) { + if ((dwc->revision > DWC3_REVISION_194A) && + (speed != DWC3_DSTS_SUPERSPEED)) { reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg |= DWC3_DCFG_LPM_CAP; dwc3_writel(dwc->regs, DWC3_DCFG, reg); @@ -2445,7 +2591,11 @@ static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc) * implemented. */ - dwc->gadget_driver->resume(&dwc->gadget); + 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, @@ -2548,6 +2698,17 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc, 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) { @@ -2599,7 +2760,20 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc, dwc3_gadget_linksts_change_interrupt(dwc, event->event_info); break; case DWC3_DEVICE_EVENT_EOPF: - dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame"); + /* 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"); @@ -2639,14 +2813,13 @@ static void dwc3_process_event_entry(struct dwc3 *dwc, } } -static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) +static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt) { - struct dwc3_event_buffer *evt; + struct dwc3 *dwc = evt->dwc; irqreturn_t ret = IRQ_NONE; int left; u32 reg; - evt = dwc->ev_buffs[buf]; left = evt->count; if (!(evt->flags & DWC3_EVENT_PENDING)) @@ -2671,7 +2844,7 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE; left -= 4; - dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4); + dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 4); } evt->count = 0; @@ -2679,39 +2852,44 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) ret = IRQ_HANDLED; /* Unmask interrupt */ - reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf)); + reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0)); reg &= ~DWC3_GEVNTSIZ_INTMASK; - dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg); + dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg); return ret; } -static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc) +static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt) { - struct dwc3 *dwc = _dwc; + struct dwc3_event_buffer *evt = _evt; + struct dwc3 *dwc = evt->dwc; unsigned long flags; irqreturn_t ret = IRQ_NONE; - int i; spin_lock_irqsave(&dwc->lock, flags); - - for (i = 0; i < dwc->num_event_buffers; i++) - ret |= dwc3_process_event_buf(dwc, i); - + ret = dwc3_process_event_buf(evt); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } -static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf) +static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt) { - struct dwc3_event_buffer *evt; + struct dwc3 *dwc = evt->dwc; u32 count; u32 reg; - evt = dwc->ev_buffs[buf]; + reg = dwc3_readl(dwc->regs, DWC3_GCTL); + + if (pm_runtime_suspended(dwc->dev) && + DWC3_GCTL_PRTCAP(reg) != DWC3_GCTL_PRTCAP_HOST) { + 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(buf)); + count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0)); count &= DWC3_GEVNTCOUNT_MASK; if (!count) return IRQ_NONE; @@ -2720,28 +2898,18 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf) evt->flags |= DWC3_EVENT_PENDING; /* Mask interrupt */ - reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf)); + reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0)); reg |= DWC3_GEVNTSIZ_INTMASK; - dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg); + dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg); return IRQ_WAKE_THREAD; } -static irqreturn_t dwc3_interrupt(int irq, void *_dwc) +static irqreturn_t dwc3_interrupt(int irq, void *_evt) { - struct dwc3 *dwc = _dwc; - int i; - irqreturn_t ret = IRQ_NONE; - - for (i = 0; i < dwc->num_event_buffers; i++) { - irqreturn_t status; + struct dwc3_event_buffer *evt = _evt; - status = dwc3_check_event_buf(dwc, i); - if (status == IRQ_WAKE_THREAD) - ret = status; - } - - return ret; + return dwc3_check_event_buf(evt); } /** @@ -2752,7 +2920,33 @@ static irqreturn_t dwc3_interrupt(int irq, void *_dwc) */ int dwc3_gadget_init(struct dwc3 *dwc) { - int ret; + 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); @@ -2785,10 +2979,17 @@ int dwc3_gadget_init(struct dwc3 *dwc) 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\n", + "Changing max_speed on rev %08x", dwc->revision); dwc->gadget.max_speed = dwc->maximum_speed; @@ -2826,16 +3027,19 @@ int dwc3_gadget_init(struct dwc3 *dwc) ret = dwc3_gadget_init_endpoints(dwc); if (ret) - goto err4; + goto err5; ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget); if (ret) { dev_err(dwc->dev, "failed to register udc\n"); - goto err4; + goto err5; } return 0; +err5: + kfree(dwc->zlp_buf); + err4: dwc3_gadget_free_endpoints(dwc); dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE, @@ -2845,7 +3049,7 @@ err3: kfree(dwc->setup_buf); err2: - dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), + dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2, dwc->ep0_trb, dwc->ep0_trb_addr); err1: @@ -2868,8 +3072,9 @@ void dwc3_gadget_exit(struct dwc3 *dwc) dwc->ep0_bounce, dwc->ep0_bounce_addr); kfree(dwc->setup_buf); + kfree(dwc->zlp_buf); - dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), + dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2, dwc->ep0_trb, dwc->ep0_trb_addr); dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req), @@ -2878,55 +3083,50 @@ void dwc3_gadget_exit(struct dwc3 *dwc) int dwc3_gadget_suspend(struct dwc3 *dwc) { - if (dwc->pullups_connected) { - dwc3_gadget_disable_irq(dwc); - dwc3_gadget_run_stop(dwc, true, true); - } + int ret; - __dwc3_gadget_ep_disable(dwc->eps[0]); - __dwc3_gadget_ep_disable(dwc->eps[1]); + if (!dwc->gadget_driver) + return 0; + + ret = dwc3_gadget_run_stop(dwc, false, false); + if (ret < 0) + dev_err(dwc->dev, "dwc3 gadget stop timeout\n"); - dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG); + dwc3_disconnect_gadget(dwc); + __dwc3_gadget_stop(dwc); return 0; } int dwc3_gadget_resume(struct dwc3 *dwc) { - struct dwc3_ep *dep; int ret; - /* Start with SuperSpeed Default */ - dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); + if (!dwc->gadget_driver) + return 0; - dep = dwc->eps[0]; - ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false, - false); - if (ret) + ret = __dwc3_gadget_start(dwc); + if (ret < 0) goto err0; - dep = dwc->eps[1]; - ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false, - false); - if (ret) + ret = dwc3_gadget_run_stop(dwc, true, false); + if (ret < 0) goto err1; - /* begin to receive SETUP packets */ - dwc->ep0state = EP0_SETUP_PHASE; - dwc3_ep0_out_start(dwc); - - dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg); - - if (dwc->pullups_connected) { - dwc3_gadget_enable_irq(dwc); - dwc3_gadget_run_stop(dwc, true, false); - } - return 0; err1: - __dwc3_gadget_ep_disable(dwc->eps[0]); + __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); + } +}