| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Felipe Balbi | 10321 | 79.95% | 202 | 62.93% |
| John Youn | 531 | 4.11% | 14 | 4.36% |
| Thinh Nguyen | 504 | 3.90% | 13 | 4.05% |
| Pratyush Anand | 344 | 2.66% | 13 | 4.05% |
| Paul Zimmerman | 228 | 1.77% | 11 | 3.43% |
| Baolin Wang | 202 | 1.56% | 3 | 0.93% |
| Roger Quadros | 138 | 1.07% | 5 | 1.56% |
| Anurag Kumar Vulisha | 132 | 1.02% | 5 | 1.56% |
| Robert Baldyga | 66 | 0.51% | 2 | 0.62% |
| Sebastian Andrzej Siewior | 43 | 0.33% | 6 | 1.87% |
| Konrad Leszczynski | 41 | 0.32% | 1 | 0.31% |
| Janusz Dziedzic | 40 | 0.31% | 4 | 1.25% |
| Manu Gautam | 40 | 0.31% | 2 | 0.62% |
| Huang Rui | 38 | 0.29% | 2 | 0.62% |
| Jiebing Li | 30 | 0.23% | 1 | 0.31% |
| Ben McCauley | 27 | 0.21% | 1 | 0.31% |
| Chanho Park | 24 | 0.19% | 1 | 0.31% |
| Jack Pham | 18 | 0.14% | 2 | 0.62% |
| Tejas Joglekar | 13 | 0.10% | 2 | 0.62% |
| Zhuang Jin Can | 13 | 0.10% | 1 | 0.31% |
| Jianqiang Tang | 12 | 0.09% | 1 | 0.31% |
| Lu Baolu | 10 | 0.08% | 1 | 0.31% |
| Andy Shevchenko | 9 | 0.07% | 1 | 0.31% |
| Arnd Bergmann | 8 | 0.06% | 1 | 0.31% |
| George Cherian | 8 | 0.06% | 1 | 0.31% |
| Ido Shayevitz | 8 | 0.06% | 2 | 0.62% |
| Subbaraya Sundeep Bhatta | 8 | 0.06% | 2 | 0.62% |
| Gerard Cauvy | 6 | 0.05% | 1 | 0.31% |
| Zeng Tao | 6 | 0.05% | 1 | 0.31% |
| Nicolas Saenz Julienne | 6 | 0.05% | 1 | 0.31% |
| Bryan O'Donoghue | 5 | 0.04% | 1 | 0.31% |
| Christophe Jaillet | 4 | 0.03% | 1 | 0.31% |
| Ville Syrjälä | 4 | 0.03% | 1 | 0.31% |
| Alan Stern | 4 | 0.03% | 1 | 0.31% |
| Dan Carpenter | 4 | 0.03% | 2 | 0.62% |
| Kishon Vijay Abraham I | 2 | 0.02% | 1 | 0.31% |
| Greg Kroah-Hartman | 2 | 0.02% | 2 | 0.62% |
| Moiz Sonasath | 2 | 0.02% | 1 | 0.31% |
| Wei Yongjun | 1 | 0.01% | 1 | 0.31% |
| Michal Sojka | 1 | 0.01% | 1 | 0.31% |
| Mayank Rana | 1 | 0.01% | 1 | 0.31% |
| Peter Chen | 1 | 0.01% | 1 | 0.31% |
| Kuninori Morimoto | 1 | 0.01% | 1 | 0.31% |
| Randy Dunlap | 1 | 0.01% | 1 | 0.31% |
| Masanari Iida | 1 | 0.01% | 1 | 0.31% |
| Vincent Pelletier | 1 | 0.01% | 1 | 0.31% |
| Total | 12909 | 321 |
// SPDX-License-Identifier: GPL-2.0 /* * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link * * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com * * Authors: Felipe Balbi <balbi@ti.com>, * Sebastian Andrzej Siewior <bigeasy@linutronix.de> */ #include <linux/kernel.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/list.h> #include <linux/dma-mapping.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> #include "debug.h" #include "core.h" #include "gadget.h" #include "io.h" #define DWC3_ALIGN_FRAME(d, n) (((d)->frame_number + ((d)->interval * (n))) \ & ~((d)->interval - 1)) /** * 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); } 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; } /** * dwc3_ep_inc_enq - increment endpoint's enqueue pointer * @dep: The endpoint whose enqueue pointer we're incrementing */ static void dwc3_ep_inc_enq(struct dwc3_ep *dep) { dwc3_ep_inc_trb(&dep->trb_enqueue); } /** * dwc3_ep_inc_deq - increment endpoint's dequeue pointer * @dep: The endpoint whose enqueue pointer we're incrementing */ static void dwc3_ep_inc_deq(struct dwc3_ep *dep) { dwc3_ep_inc_trb(&dep->trb_dequeue); } static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep, struct dwc3_request *req, int status) { struct dwc3 *dwc = dep->dwc; list_del(&req->list); req->remaining = 0; req->needs_extra_trb = false; if (req->request.status == -EINPROGRESS) req->request.status = status; if (req->trb) usb_gadget_unmap_request_by_dev(dwc->sysdev, &req->request, req->direction); req->trb = NULL; trace_dwc3_gadget_giveback(req); if (dep->number > 1) pm_runtime_put(dwc->dev); } /** * dwc3_gadget_giveback - call struct usb_request's ->complete callback * @dep: The endpoint to whom the request belongs to * @req: The request we're giving back * @status: completion code for the request * * Must be called with controller's lock held and interrupts disabled. This * function will unmap @req and call its ->complete() callback to notify upper * layers that it has completed. */ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, int status) { struct dwc3 *dwc = dep->dwc; dwc3_gadget_del_and_unmap_request(dep, req, status); req->status = DWC3_REQUEST_STATUS_COMPLETED; spin_unlock(&dwc->lock); usb_gadget_giveback_request(&dep->endpoint, &req->request); spin_lock(&dwc->lock); } /** * dwc3_send_gadget_generic_command - issue a generic command for the controller * @dwc: pointer to the controller context * @cmd: the command to be issued * @param: command parameter * * Caller should take care of locking. Issue @cmd with a given @param to @dwc * and wait for its completion. */ 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); /** * dwc3_send_gadget_ep_cmd - issue an endpoint command * @dep: the endpoint to which the command is going to be issued * @cmd: the command to be issued * @params: parameters to the command * * Caller should handle locking. This function will issue @cmd with given * @params to @dep and wait for its completion. */ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd, struct dwc3_gadget_ep_cmd_params *params) { const struct usb_endpoint_descriptor *desc = dep->endpoint.desc; struct dwc3 *dwc = dep->dwc; u32 timeout = 1000; u32 saved_config = 0; u32 reg; int cmd_status = 0; int ret = -EINVAL; /* * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an * endpoint command. * * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY * settings. Restore them after the command is completed. * * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2 */ if (dwc->gadget.speed <= USB_SPEED_HIGH) { reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) { saved_config |= DWC3_GUSB2PHYCFG_SUSPHY; reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; } if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) { saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM; reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM; } if (saved_config) dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); } if (DWC3_DEPCMD_CMD(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); /* * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're * not relying on XferNotReady, we can make use of a special "No * Response Update Transfer" command where we should clear both CmdAct * and CmdIOC bits. * * With this, we don't need to wait for command completion and can * straight away issue further commands to the endpoint. * * NOTICE: We're making an assumption that control endpoints will never * make use of Update Transfer command. This is a safe assumption * because we can never have more than one request at a time with * Control Endpoints. If anybody changes that assumption, this chunk * needs to be updated accordingly. */ if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER && !usb_endpoint_xfer_isoc(desc)) cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT); else cmd |= DWC3_DEPCMD_CMDACT; dwc3_writel(dep->regs, DWC3_DEPCMD, cmd); 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 (ret == 0 && DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) { dep->flags |= DWC3_EP_TRANSFER_STARTED; dwc3_gadget_ep_get_transfer_index(dep); } if (saved_config) { reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); reg |= saved_config; 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) && (dwc->gadget.speed >= USB_SPEED_SUPER)) 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->sysdev, 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->sysdev, 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_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_start_config - configure ep resources * @dep: endpoint that is being enabled * * Issue a %DWC3_DEPCMD_DEPSTARTCFG command to @dep. After the command's * completion, it will set Transfer Resource for all available endpoints. * * 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 %DWC3_DEPCMD_DEPSTARTCFG for every * %USB_REQ_SET_CONFIGURATION and %USB_REQ_SET_INTERFACE (8.1.5). This is * incorrect in the scenario of multiple interfaces. * * 2) The databook does not mention doing more %DWC3_DEPCMD_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 %DWC3_DEPCMD_DEPSTARTCFG(0) we can go ahead and do * %DWC3_DEPCMD_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_ep *dep) { struct dwc3_gadget_ep_cmd_params params; struct dwc3 *dwc; u32 cmd; int i; int ret; if (dep->number) return 0; memset(¶ms, 0x00, sizeof(params)); cmd = DWC3_DEPCMD_DEPSTARTCFG; dwc = dep->dwc; 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(dep); if (ret) return ret; } return 0; } static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action) { const struct usb_ss_ep_comp_descriptor *comp_desc; const struct usb_endpoint_descriptor *desc; struct dwc3_gadget_ep_cmd_params params; struct dwc3 *dwc = dep->dwc; comp_desc = dep->endpoint.comp_desc; desc = dep->endpoint.desc; 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); } params.param0 |= action; if (action == DWC3_DEPCFG_ACTION_RESTORE) params.param2 |= dep->saved_state; if (usb_endpoint_xfer_control(desc)) 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); } /** * __dwc3_gadget_ep_enable - initializes a hw endpoint * @dep: endpoint to be initialized * @action: one of INIT, MODIFY or RESTORE * * Caller should take care of locking. Execute all necessary commands to * initialize a HW endpoint so it can be used by a gadget driver. */ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action) { const struct usb_endpoint_descriptor *desc = dep->endpoint.desc; struct dwc3 *dwc = dep->dwc; u32 reg; int ret; if (!(dep->flags & DWC3_EP_ENABLED)) { ret = dwc3_gadget_start_config(dep); if (ret) return ret; } ret = dwc3_gadget_set_ep_config(dep, action); if (ret) return ret; if (!(dep->flags & DWC3_EP_ENABLED)) { struct dwc3_trb *trb_st_hw; struct dwc3_trb *trb_link; 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)) goto out; /* 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; } /* * Issue StartTransfer here with no-op TRB so we can always rely on No * Response Update Transfer command. */ if ((usb_endpoint_xfer_bulk(desc) && !dep->stream_capable) || usb_endpoint_xfer_int(desc)) { struct dwc3_gadget_ep_cmd_params params; struct dwc3_trb *trb; dma_addr_t trb_dma; u32 cmd; memset(¶ms, 0, sizeof(params)); trb = &dep->trb_pool[0]; trb_dma = dwc3_trb_dma_offset(dep, trb); params.param0 = upper_32_bits(trb_dma); params.param1 = lower_32_bits(trb_dma); cmd = DWC3_DEPCMD_STARTTRANSFER; ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); if (ret < 0) return ret; } out: trace_dwc3_gadget_ep_enable(dep); return 0; } static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool interrupt); static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_request *req; dwc3_stop_active_transfer(dep, true, false); /* - 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 undoes what __dwc3_gadget_ep_enable did and also removes * requests which are currently being processed by 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; trace_dwc3_gadget_ep_disable(dep); 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->type = 0; dep->flags = 0; /* Clear out the ep descriptors for non-ep0 */ if (dep->number > 1) { dep->endpoint.comp_desc = NULL; dep->endpoint.desc = NULL; } 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, DWC3_DEPCFG_ACTION_INIT); 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->direction = dep->direction; req->epnum = dep->number; req->dep = dep; req->status = DWC3_REQUEST_STATUS_UNKNOWN; 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); trace_dwc3_free_request(req); kfree(req); } /** * 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) { u8 tmp = index; if (!tmp) tmp = DWC3_TRB_NUM - 1; return &dep->trb_pool[tmp - 1]; } 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(struct dwc3_ep *dep, struct dwc3_trb *trb, dma_addr_t dma, unsigned length, unsigned chain, unsigned node, unsigned stream_id, unsigned short_not_ok, unsigned no_interrupt) { struct dwc3 *dwc = dep->dwc; struct usb_gadget *gadget = &dwc->gadget; enum usb_device_speed speed = gadget->speed; 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; /* * USB Specification 2.0 Section 5.9.2 states that: "If * there is only a single transaction in the microframe, * only a DATA0 data packet PID is used. If there are * two transactions per microframe, DATA1 is used for * the first transaction data packet and DATA0 is used * for the second transaction data packet. If there are * three transactions per microframe, DATA2 is used for * the first transaction data packet, DATA1 is used for * the second, and DATA0 is used for the third." * * IOW, we should satisfy the following cases: * * 1) length <= maxpacket * - DATA0 * * 2) maxpacket < length <= (2 * maxpacket) * - DATA1, DATA0 * * 3) (2 * maxpacket) < length <= (3 * maxpacket) * - DATA2, DATA1, DATA0 */ if (speed == USB_SPEED_HIGH) { struct usb_ep *ep = &dep->endpoint; unsigned int mult = 2; unsigned int maxp = usb_endpoint_maxp(ep->desc); if (length <= (2 * maxp)) mult--; if (length <= maxp) mult--; trb->size |= DWC3_TRB_SIZE_PCM1(mult); } } 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 :) */ dev_WARN(dwc->dev, "Unknown endpoint type %d\n", usb_endpoint_type(dep->endpoint.desc)); } /* * Enable Continue on Short Packet * when endpoint is not a stream capable */ if (usb_endpoint_dir_out(dep->endpoint.desc)) { if (!dep->stream_capable) trb->ctrl |= DWC3_TRB_CTRL_CSP; if (short_not_ok) trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI; } if ((!no_interrupt && !chain) || (dwc3_calc_trbs_left(dep) == 1)) trb->ctrl |= DWC3_TRB_CTRL_IOC; 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(stream_id); trb->ctrl |= DWC3_TRB_CTRL_HWO; dwc3_ep_inc_enq(dep); trace_dwc3_prepare_trb(dep, trb); } /** * dwc3_prepare_one_trb - setup one TRB from one request * @dep: endpoint for which this request is prepared * @req: dwc3_request pointer * @chain: should this TRB be chained to the next? * @node: only for isochronous endpoints. First TRB needs different type. */ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_request *req, unsigned chain, unsigned node) { struct dwc3_trb *trb; unsigned int length; dma_addr_t dma; unsigned stream_id = req->request.stream_id; unsigned short_not_ok = req->request.short_not_ok; unsigned no_interrupt = req->request.no_interrupt; if (req->request.num_sgs > 0) { length = sg_dma_len(req->start_sg); dma = sg_dma_address(req->start_sg); } else { length = req->request.length; dma = req->request.dma; } 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->num_trbs++; __dwc3_prepare_one_trb(dep, trb, dma, length, chain, node, stream_id, short_not_ok, no_interrupt); } static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep, struct dwc3_request *req) { struct scatterlist *sg = req->start_sg; struct scatterlist *s; int i; unsigned int remaining = req->request.num_mapped_sgs - req->num_queued_sgs; for_each_sg(sg, s, remaining, i) { unsigned int length = req->request.length; unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc); unsigned int rem = length % maxp; unsigned chain = true; if (sg_is_last(s)) chain = false; if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) { struct dwc3 *dwc = dep->dwc; struct dwc3_trb *trb; req->needs_extra_trb = true; /* prepare normal TRB */ dwc3_prepare_one_trb(dep, req, true, i); /* Now prepare one extra TRB to align transfer size */ trb = &dep->trb_pool[dep->trb_enqueue]; req->num_trbs++; __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem, false, 1, req->request.stream_id, req->request.short_not_ok, req->request.no_interrupt); } else { dwc3_prepare_one_trb(dep, req, chain, i); } /* * There can be a situation where all sgs in sglist are not * queued because of insufficient trb number. To handle this * case, update start_sg to next sg to be queued, so that * we have free trbs we can continue queuing from where we * previously stopped */ if (chain) req->start_sg = sg_next(s); req->num_queued_sgs++; if (!dwc3_calc_trbs_left(dep)) break; } } static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep, struct dwc3_request *req) { unsigned int length = req->request.length; unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc); unsigned int rem = length % maxp; if ((!length || rem) && usb_endpoint_dir_out(dep->endpoint.desc)) { struct dwc3 *dwc = dep->dwc; struct dwc3_trb *trb; req->needs_extra_trb = true; /* prepare normal TRB */ dwc3_prepare_one_trb(dep, req, true, 0); /* Now prepare one extra TRB to align transfer size */ trb = &dep->trb_pool[dep->trb_enqueue]; req->num_trbs++; __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem, false, 1, req->request.stream_id, req->request.short_not_ok, req->request.no_interrupt); } else if (req->request.zero && req->request.length && (IS_ALIGNED(req->request.length, maxp))) { struct dwc3 *dwc = dep->dwc; struct dwc3_trb *trb; req->needs_extra_trb = true; /* prepare normal TRB */ dwc3_prepare_one_trb(dep, req, true, 0); /* Now prepare one extra TRB to handle ZLP */ trb = &dep->trb_pool[dep->trb_enqueue]; req->num_trbs++; __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0, false, 1, req->request.stream_id, req->request.short_not_ok, req->request.no_interrupt); } else { dwc3_prepare_one_trb(dep, req, 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; BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); /* * We can get in a situation where there's a request in the started list * but there weren't enough TRBs to fully kick it in the first time * around, so it has been waiting for more TRBs to be freed up. * * In that case, we should check if we have a request with pending_sgs * in the started list and prepare TRBs for that request first, * otherwise we will prepare TRBs completely out of order and that will * break things. */ list_for_each_entry(req, &dep->started_list, list) { if (req->num_pending_sgs > 0) dwc3_prepare_one_trb_sg(dep, req); if (!dwc3_calc_trbs_left(dep)) return; } list_for_each_entry_safe(req, n, &dep->pending_list, list) { struct dwc3 *dwc = dep->dwc; int ret; ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request, dep->direction); if (ret) return; req->sg = req->request.sg; req->start_sg = req->sg; req->num_queued_sgs = 0; req->num_pending_sgs = req->request.num_mapped_sgs; if (req->num_pending_sgs > 0) dwc3_prepare_one_trb_sg(dep, req); else dwc3_prepare_one_trb_linear(dep, req); if (!dwc3_calc_trbs_left(dep)) return; } } static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep) { struct dwc3_gadget_ep_cmd_params params; struct dwc3_request *req; int starting; int ret; u32 cmd; if (!dwc3_calc_trbs_left(dep)) return 0; starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED); 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; if (dep->stream_capable) cmd |= DWC3_DEPCMD_PARAM(req->request.stream_id); if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) cmd |= DWC3_DEPCMD_PARAM(dep->frame_number); } 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. */ if (req->trb) memset(req->trb, 0, sizeof(struct dwc3_trb)); dwc3_gadget_del_and_unmap_request(dep, req, ret); return ret; } return 0; } static int __dwc3_gadget_get_frame(struct dwc3 *dwc) { u32 reg; reg = dwc3_readl(dwc->regs, DWC3_DSTS); return DWC3_DSTS_SOFFN(reg); } /** * dwc3_gadget_start_isoc_quirk - workaround invalid frame number * @dep: isoc endpoint * * This function tests for the correct combination of BIT[15:14] from the 16-bit * microframe number reported by the XferNotReady event for the future frame * number to start the isoc transfer. * * In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed * isochronous IN, BIT[15:14] of the 16-bit microframe number reported by the * XferNotReady event are invalid. The driver uses this number to schedule the * isochronous transfer and passes it to the START TRANSFER command. Because * this number is invalid, the command may fail. If BIT[15:14] matches the * internal 16-bit microframe, the START TRANSFER command will pass and the * transfer will start at the scheduled time, if it is off by 1, the command * will still pass, but the transfer will start 2 seconds in the future. For all * other conditions, the START TRANSFER command will fail with bus-expiry. * * In order to workaround this issue, we can test for the correct combination of * BIT[15:14] by sending START TRANSFER commands with different values of * BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each combination is 2^14 uframe apart * (or 2 seconds). 4 seconds into the future will result in a bus-expiry status. * As the result, within the 4 possible combinations for BIT[15:14], there will * be 2 successful and 2 failure START COMMAND status. One of the 2 successful * command status will result in a 2-second delay start. The smaller BIT[15:14] * value is the correct combination. * * Since there are only 4 outcomes and the results are ordered, we can simply * test 2 START TRANSFER commands with BIT[15:14] combinations 'b00 and 'b01 to * deduce the smaller successful combination. * * Let test0 = test status for combination 'b00 and test1 = test status for 'b01 * of BIT[15:14]. The correct combination is as follow: * * if test0 fails and test1 passes, BIT[15:14] is 'b01 * if test0 fails and test1 fails, BIT[15:14] is 'b10 * if test0 passes and test1 fails, BIT[15:14] is 'b11 * if test0 passes and test1 passes, BIT[15:14] is 'b00 * * Synopsys STAR 9001202023: Wrong microframe number for isochronous IN * endpoints. */ static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep) { int cmd_status = 0; bool test0; bool test1; while (dep->combo_num < 2) { struct dwc3_gadget_ep_cmd_params params; u32 test_frame_number; u32 cmd; /* * Check if we can start isoc transfer on the next interval or * 4 uframes in the future with BIT[15:14] as dep->combo_num */ test_frame_number = dep->frame_number & 0x3fff; test_frame_number |= dep->combo_num << 14; test_frame_number += max_t(u32, 4, dep->interval); params.param0 = upper_32_bits(dep->dwc->bounce_addr); params.param1 = lower_32_bits(dep->dwc->bounce_addr); cmd = DWC3_DEPCMD_STARTTRANSFER; cmd |= DWC3_DEPCMD_PARAM(test_frame_number); cmd_status = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); /* Redo if some other failure beside bus-expiry is received */ if (cmd_status && cmd_status != -EAGAIN) { dep->start_cmd_status = 0; dep->combo_num = 0; return 0; } /* Store the first test status */ if (dep->combo_num == 0) dep->start_cmd_status = cmd_status; dep->combo_num++; /* * End the transfer if the START_TRANSFER command is successful * to wait for the next XferNotReady to test the command again */ if (cmd_status == 0) { dwc3_stop_active_transfer(dep, true, true); return 0; } } /* test0 and test1 are both completed at this point */ test0 = (dep->start_cmd_status == 0); test1 = (cmd_status == 0); if (!test0 && test1) dep->combo_num = 1; else if (!test0 && !test1) dep->combo_num = 2; else if (test0 && !test1) dep->combo_num = 3; else if (test0 && test1) dep->combo_num = 0; dep->frame_number &= 0x3fff; dep->frame_number |= dep->combo_num << 14; dep->frame_number += max_t(u32, 4, dep->interval); /* Reinitialize test variables */ dep->start_cmd_status = 0; dep->combo_num = 0; return __dwc3_gadget_kick_transfer(dep); } static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; int ret; int i; if (list_empty(&dep->pending_list)) { dep->flags |= DWC3_EP_PENDING_REQUEST; return -EAGAIN; } if (!dwc->dis_start_transfer_quirk && dwc3_is_usb31(dwc) && (dwc->revision <= DWC3_USB31_REVISION_160A || (dwc->revision == DWC3_USB31_REVISION_170A && dwc->version_type >= DWC31_VERSIONTYPE_EA01 && dwc->version_type <= DWC31_VERSIONTYPE_EA06))) { if (dwc->gadget.speed <= USB_SPEED_HIGH && dep->direction) return dwc3_gadget_start_isoc_quirk(dep); } for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) { dep->frame_number = DWC3_ALIGN_FRAME(dep, i + 1); ret = __dwc3_gadget_kick_transfer(dep); if (ret != -EAGAIN) break; } return ret; } static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) { struct dwc3 *dwc = dep->dwc; if (!dep->endpoint.desc) { dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n", dep->name); return -ESHUTDOWN; } if (WARN(req->dep != dep, "request %pK belongs to '%s'\n", &req->request, req->dep->name)) return -EINVAL; if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED, "%s: request %pK already in flight\n", dep->name, &req->request)) return -EINVAL; pm_runtime_get(dwc->dev); req->request.actual = 0; req->request.status = -EINPROGRESS; trace_dwc3_ep_queue(req); list_add_tail(&req->list, &dep->pending_list); req->status = DWC3_REQUEST_STATUS_QUEUED; /* * NOTICE: Isochronous endpoints should NEVER be prestarted. We must * wait for a XferNotReady event so we will know what's the current * (micro-)frame number. * * Without this trick, we are very, very likely gonna get Bus Expiry * errors which will force us issue EndTransfer command. */ if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { if (!(dep->flags & DWC3_EP_PENDING_REQUEST) && !(dep->flags & DWC3_EP_TRANSFER_STARTED)) return 0; if ((dep->flags & DWC3_EP_PENDING_REQUEST)) { if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) { return __dwc3_gadget_start_isoc(dep); } } } return __dwc3_gadget_kick_transfer(dep); } 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); spin_unlock_irqrestore(&dwc->lock, flags); return ret; } static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *req) { int i; /* * If request was already started, this means we had to * stop the transfer. With that we also need to ignore * all TRBs used by the request, however TRBs can only * be modified after completion of END_TRANSFER * command. So what we do here is that we wait for * END_TRANSFER completion and only after that, we jump * over TRBs by clearing HWO and incrementing dequeue * pointer. */ for (i = 0; i < req->num_trbs; i++) { struct dwc3_trb *trb; trb = req->trb + i; trb->ctrl &= ~DWC3_TRB_CTRL_HWO; dwc3_ep_inc_deq(dep); } req->num_trbs = 0; } static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep) { struct dwc3_request *req; struct dwc3_request *tmp; list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) { dwc3_gadget_ep_skip_trbs(dep, req); dwc3_gadget_giveback(dep, req, -ECONNRESET); } } 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(dep, true, true); if (!r->trb) goto out0; dwc3_gadget_move_cancelled_request(req); if (dep->flags & DWC3_EP_TRANSFER_STARTED) goto out0; else goto out1; } dev_err(dwc->dev, "request %pK was not queued to %s\n", request, ep->name); ret = -EINVAL; goto out0; } out1: 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))) { 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); return __dwc3_gadget_get_frame(dwc); } 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)) 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: 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; 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; /* * Per databook, when we want to stop the gadget, if a control transfer * is still in process, complete it and get the core into setup phase. */ if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) { reinit_completion(&dwc->ep0_in_setup); ret = wait_for_completion_timeout(&dwc->ep0_in_setup, msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT)); if (ret == 0) { dev_err(dwc->dev, "timed out waiting for SETUP phase\n"); return -ETIMEDOUT; } } 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_CONNECTDONEEN | DWC3_DEVTEN_USBRSTEN | DWC3_DEVTEN_DISCONNEVTEN); if (dwc->revision < DWC3_REVISION_250A) reg |= DWC3_DEVTEN_ULSTCNGEN; 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 %DWC3_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; /* * Use IMOD if enabled via dwc->imod_interval. Otherwise, if * the core supports IMOD, disable it. */ if (dwc->imod_interval) { dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval); dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB); } else if (dwc3_has_imod(dwc)) { dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0); } /* * 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); if (dwc3_is_usb31(dwc)) reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL; else 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_DEPCFG_ACTION_INIT); 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_DEPCFG_ACTION_INIT); 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; dwc->link_state = DWC3_LINK_STATE_SS_DIS; 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) { 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); if (pm_runtime_suspended(dwc->dev)) goto out; __dwc3_gadget_stop(dwc); out: dwc->gadget_driver = NULL; spin_unlock_irqrestore(&dwc->lock, flags); free_irq(dwc->irq_gadget, dwc->ev_buf); return 0; } static void dwc3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed) { struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags; u32 reg; spin_lock_irqsave(&dwc->lock, flags); 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 && !dwc->dis_metastability_quirk) { reg |= DWC3_DCFG_SUPERSPEED; } else { switch (speed) { case USB_SPEED_LOW: reg |= DWC3_DCFG_LOWSPEED; break; case USB_SPEED_FULL: reg |= DWC3_DCFG_FULLSPEED; break; case USB_SPEED_HIGH: reg |= DWC3_DCFG_HIGHSPEED; break; case USB_SPEED_SUPER: reg |= DWC3_DCFG_SUPERSPEED; break; case USB_SPEED_SUPER_PLUS: if (dwc3_is_usb31(dwc)) reg |= DWC3_DCFG_SUPERSPEED_PLUS; else reg |= DWC3_DCFG_SUPERSPEED; break; default: dev_err(dwc->dev, "invalid speed (%d)\n", speed); if (dwc->revision & DWC3_REVISION_IS_DWC31) reg |= DWC3_DCFG_SUPERSPEED_PLUS; else reg |= DWC3_DCFG_SUPERSPEED; } } dwc3_writel(dwc->regs, DWC3_DCFG, reg); spin_unlock_irqrestore(&dwc->lock, flags); } 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, .udc_set_speed = dwc3_gadget_set_speed, }; /* -------------------------------------------------------------------------- */ static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; usb_ep_set_maxpacket_limit(&dep->endpoint, 512); dep->endpoint.maxburst = 1; dep->endpoint.ops = &dwc3_gadget_ep0_ops; if (!dep->direction) dwc->gadget.ep0 = &dep->endpoint; dep->endpoint.caps.type_control = true; return 0; } static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; int mdwidth; int kbytes; int size; mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0); /* MDWIDTH is represented in bits, we need it in bytes */ mdwidth /= 8; size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1)); if (dwc3_is_usb31(dwc)) size = DWC31_GTXFIFOSIZ_TXFDEF(size); else size = DWC3_GTXFIFOSIZ_TXFDEF(size); /* FIFO Depth is in MDWDITH bytes. Multiply */ size *= mdwidth; kbytes = size / 1024; if (kbytes == 0) kbytes = 1; /* * FIFO sizes account an extra MDWIDTH * (kbytes + 1) bytes for * internal overhead. We don't really know how these are used, * but documentation say it exists. */ size -= mdwidth * (kbytes + 1); size /= kbytes; usb_ep_set_maxpacket_limit(&dep->endpoint, size); dep->endpoint.max_streams = 15; dep->endpoint.ops = &dwc3_gadget_ep_ops; list_add_tail(&dep->endpoint.ep_list, &dwc->gadget.ep_list); dep->endpoint.caps.type_iso = true; dep->endpoint.caps.type_bulk = true; dep->endpoint.caps.type_int = true; return dwc3_alloc_trb_pool(dep); } static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep) { struct dwc3 *dwc = dep->dwc; 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); dep->endpoint.caps.type_iso = true; dep->endpoint.caps.type_bulk = true; dep->endpoint.caps.type_int = true; return dwc3_alloc_trb_pool(dep); } static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum) { struct dwc3_ep *dep; bool direction = epnum & 1; int ret; u8 num = epnum >> 1; 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; dep->combo_num = 0; dep->start_cmd_status = 0; snprintf(dep->name, sizeof(dep->name), "ep%u%s", num, direction ? "in" : "out"); dep->endpoint.name = dep->name; if (!(dep->number > 1)) { dep->endpoint.desc = &dwc3_gadget_ep0_desc; dep->endpoint.comp_desc = NULL; } spin_lock_init(&dep->lock); if (num == 0) ret = dwc3_gadget_init_control_endpoint(dep); else if (direction) ret = dwc3_gadget_init_in_endpoint(dep); else ret = dwc3_gadget_init_out_endpoint(dep); if (ret) return ret; dep->endpoint.caps.dir_in = direction; dep->endpoint.caps.dir_out = !direction; INIT_LIST_HEAD(&dep->pending_list); INIT_LIST_HEAD(&dep->started_list); INIT_LIST_HEAD(&dep->cancelled_list); return 0; } static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total) { u8 epnum; INIT_LIST_HEAD(&dwc->gadget.ep_list); for (epnum = 0; epnum < total; epnum++) { int ret; ret = dwc3_gadget_init_endpoint(dwc, epnum); if (ret) 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_gadget_ep_reclaim_completed_trb(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; dwc3_ep_inc_deq(dep); trace_dwc3_complete_trb(dep, trb); req->num_trbs--; /* * 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; /* * For isochronous transfers, the first TRB in a service interval must * have the Isoc-First type. Track and report its interval frame number. */ if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && (trb->ctrl & DWC3_TRBCTL_ISOCHRONOUS_FIRST)) { unsigned int frame_number; frame_number = DWC3_TRB_CTRL_GET_SID_SOFN(trb->ctrl); frame_number &= ~(dep->interval - 1); req->request.frame_number = frame_number; } /* * If we're dealing with unaligned size OUT transfer, we will be left * with one TRB pending in the ring. We need to manually clear HWO bit * from that TRB. */ if (req->needs_extra_trb && !(trb->ctrl & DWC3_TRB_CTRL_CHN)) { trb->ctrl &= ~DWC3_TRB_CTRL_HWO; return 1; } count = trb->size & DWC3_TRB_SIZE_MASK; req->remaining += count; if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN) return 1; if (event->status & DEPEVT_STATUS_SHORT && !chain) return 1; if (event->status & DEPEVT_STATUS_IOC) return 1; return 0; } static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep, struct dwc3_request *req, const struct dwc3_event_depevt *event, int status) { struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue]; struct scatterlist *sg = req->sg; struct scatterlist *s; unsigned int pending = req->num_pending_sgs; unsigned int i; int ret = 0; for_each_sg(sg, s, pending, i) { trb = &dep->trb_pool[dep->trb_dequeue]; if (trb->ctrl & DWC3_TRB_CTRL_HWO) break; req->sg = sg_next(s); req->num_pending_sgs--; ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb, event, status, true); if (ret) break; } return ret; } static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep, struct dwc3_request *req, const struct dwc3_event_depevt *event, int status) { struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue]; return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb, event, status, false); } static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req) { return req->request.actual == req->request.length; } static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep, const struct dwc3_event_depevt *event, struct dwc3_request *req, int status) { int ret; if (req->num_pending_sgs) ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event, status); else ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event, status); if (req->needs_extra_trb) { ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event, status); req->needs_extra_trb = false; } req->request.actual = req->request.length - req->remaining; if (!dwc3_gadget_ep_request_completed(req) && req->num_pending_sgs) { __dwc3_gadget_kick_transfer(dep); goto out; } dwc3_gadget_giveback(dep, req, status); out: return ret; } static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep, const struct dwc3_event_depevt *event, int status) { struct dwc3_request *req; struct dwc3_request *tmp; list_for_each_entry_safe(req, tmp, &dep->started_list, list) { int ret; ret = dwc3_gadget_ep_cleanup_completed_request(dep, event, req, status); if (ret) break; } } static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep, const struct dwc3_event_depevt *event) { dep->frame_number = event->parameters; } static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep, const struct dwc3_event_depevt *event) { struct dwc3 *dwc = dep->dwc; unsigned status = 0; bool stop = false; dwc3_gadget_endpoint_frame_from_event(dep, event); if (event->status & DEPEVT_STATUS_BUSERR) status = -ECONNRESET; if (event->status & DEPEVT_STATUS_MISSED_ISOC) { status = -EXDEV; if (list_empty(&dep->started_list)) stop = true; } dwc3_gadget_ep_cleanup_completed_requests(dep, event, status); if (stop) { dwc3_stop_active_transfer(dep, true, true); dep->flags = DWC3_EP_ENABLED; } /* * 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; } } static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep, const struct dwc3_event_depevt *event) { dwc3_gadget_endpoint_frame_from_event(dep, event); (void) __dwc3_gadget_start_isoc(dep); } static void dwc3_endpoint_interrupt(struct dwc3 *dwc, const struct dwc3_event_depevt *event) { struct dwc3_ep *dep; u8 epnum = event->endpoint_number; u8 cmd; dep = dwc->eps[epnum]; if (!(dep->flags & DWC3_EP_ENABLED)) { if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) return; /* Handle only EPCMDCMPLT when EP disabled */ if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT) return; } if (epnum == 0 || epnum == 1) { dwc3_ep0_interrupt(dwc, event); return; } switch (event->endpoint_event) { case DWC3_DEPEVT_XFERINPROGRESS: dwc3_gadget_endpoint_transfer_in_progress(dep, event); break; case DWC3_DEPEVT_XFERNOTREADY: dwc3_gadget_endpoint_transfer_not_ready(dep, event); break; case DWC3_DEPEVT_EPCMDCMPLT: cmd = DEPEVT_PARAMETER_CMD(event->parameters); if (cmd == DWC3_DEPCMD_ENDTRANSFER) { dep->flags &= ~DWC3_EP_TRANSFER_STARTED; dwc3_gadget_ep_cleanup_cancelled_requests(dep); } break; case DWC3_DEPEVT_STREAMEVT: case DWC3_DEPEVT_XFERCOMPLETE: case DWC3_DEPEVT_RXTXFIFOEVT: 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_ep *dep, bool force, bool interrupt) { struct dwc3 *dwc = dep->dwc; struct dwc3_gadget_ep_cmd_params params; u32 cmd; int ret; if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) 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 * * As of IP version 3.10a of the DWC_usb3 IP, the controller * supports a mode to work around the above limitation. The * software can poll the CMDACT bit in the DEPCMD register * after issuing a EndTransfer command. This mode is enabled * by writing GUCTL2[14]. This polling is already done in the * dwc3_send_gadget_ep_cmd() function so if the mode is * enabled, the EndTransfer command will have completed upon * returning from this function and we don't need to delay for * 100us. * * This mode is NOT available on the DWC_usb31 IP. */ cmd = DWC3_DEPCMD_ENDTRANSFER; cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0; cmd |= interrupt ? DWC3_DEPCMD_CMDIOC : 0; 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; if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) udelay(100); } 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_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_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; /* * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed * each time on Connect Done. * * Currently we always use the reset value. If any platform * wants to set this to a different value, we need to add a * setting and update GCTL.RAMCLKSEL here. */ 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_FULLSPEED: 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; } dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket; /* 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 revisions < 2.40a\n"); if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A) reg |= DWC3_DCTL_NYET_THRES(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_DEPCFG_ACTION_MODIFY); 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_DEPCFG_ACTION_MODIFY); 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)) { 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) { /* * 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: case DWC3_DEVICE_EVENT_ERRATIC_ERROR: case DWC3_DEVICE_EVENT_CMD_CMPL: case DWC3_DEVICE_EVENT_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, dwc); if (!event->type.is_devspec) dwc3_endpoint_interrupt(dwc, &event->depevt); else if (event->type.type == DWC3_EVENT_TYPE_DEV) dwc3_gadget_interrupt(dwc, &event->devt); else 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->cache + 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) % evt->length; left -= 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); if (dwc->imod_interval) { dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB); dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval); } 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 amount; 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; } /* * With PCIe legacy interrupt, test shows that top-half irq handler can * be called again after HW interrupt deassertion. Check if bottom-half * irq event handler completes before caching new event to prevent * losing events. */ if (evt->flags & DWC3_EVENT_PENDING) 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); amount = min(count, evt->length - evt->lpos); memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount); if (amount < count) memcpy(evt->cache, evt->buf, count - amount); dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count); 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); } static int dwc3_gadget_get_irq(struct dwc3 *dwc) { struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); int irq; irq = platform_get_irq_byname(dwc3_pdev, "peripheral"); if (irq > 0) goto out; if (irq == -EPROBE_DEFER) goto out; irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3"); if (irq > 0) goto out; if (irq == -EPROBE_DEFER) goto out; irq = platform_get_irq(dwc3_pdev, 0); if (irq > 0) goto out; if (irq != -EPROBE_DEFER) dev_err(dwc->dev, "missing peripheral IRQ\n"); if (!irq) irq = -EINVAL; out: return irq; } /** * 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; int irq; irq = dwc3_gadget_get_irq(dwc); if (irq < 0) { ret = irq; goto err0; } dwc->irq_gadget = irq; dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev, 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 err0; } dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL); if (!dwc->setup_buf) { ret = -ENOMEM; goto err1; } dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, &dwc->bounce_addr, GFP_KERNEL); if (!dwc->bounce) { ret = -ENOMEM; goto err2; } init_completion(&dwc->ep0_in_setup); 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; dwc->gadget.lpm_capable = true; /* * FIXME We might be setting max_speed to <SUPER, however versions * <2.20a of dwc3 have an issue with metastability (documented * elsewhere in this driver) which tells us we can't set max speed to * anything lower than SUPER. * * Because gadget.max_speed is only used by composite.c and function * drivers (i.e. it won't go into dwc3's registers) we are allowing this * to happen so we avoid sending SuperSpeed Capability descriptor * together with our BOS descriptor as that could confuse host into * thinking we can handle super speed. * * Note that, in fact, we won't even support GetBOS requests when speed * is less than super speed because we don't have means, yet, to tell * composite.c that we are USB 2.0 + LPM ECN. */ if (dwc->revision < DWC3_REVISION_220A && !dwc->dis_metastability_quirk) dev_info(dwc->dev, "changing max_speed on rev %08x\n", dwc->revision); dwc->gadget.max_speed = dwc->maximum_speed; /* * 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, dwc->num_eps); if (ret) goto err3; ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget); if (ret) { dev_err(dwc->dev, "failed to register udc\n"); goto err4; } dwc3_gadget_set_speed(&dwc->gadget, dwc->maximum_speed); return 0; err4: dwc3_gadget_free_endpoints(dwc); err3: dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce, dwc->bounce_addr); err2: kfree(dwc->setup_buf); err1: dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2, dwc->ep0_trb, dwc->ep0_trb_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->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce, dwc->bounce_addr); kfree(dwc->setup_buf); dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2, dwc->ep0_trb, dwc->ep0_trb_addr); } int dwc3_gadget_suspend(struct dwc3 *dwc) { if (!dwc->gadget_driver) return 0; dwc3_gadget_run_stop(dwc, false, false); 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); } }
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