| // 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_LPM_ERRATA(dwc->lpm_nyet_threshold); |
| |
| dwc3_writel(dwc->regs, DWC3_DCTL, reg); |
| } else { |
| reg = dwc3_readl(dwc->regs, DWC3_DCTL); |
| reg &= ~DWC3_DCTL_HIRD_THRES_MASK; |
| dwc3_writel(dwc->regs, DWC3_DCTL, reg); |
| } |
| |
| dep = dwc->eps[0]; |
| ret = __dwc3_gadget_ep_enable(dep, DWC3_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; |
|