/* * This interrupt indicates that SUSPEND state has been detected on the USB. * * For HNP the USB Suspend interrupt signals the change from "a_peripheral" * to "a_host". * * When power management is enabled the core will be put in low power mode. */ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg) { u32 dsts; dev_dbg(hsotg->dev, "USB SUSPEND\n"); if (dwc2_is_device_mode(hsotg)) { /* * Check the Device status register to determine if the Suspend * state is active */ dsts = readl(hsotg->regs + DSTS); dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts); dev_dbg(hsotg->dev, "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n", !!(dsts & DSTS_SUSPSTS), hsotg->hw_params.power_optimized); } else { if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) { dev_dbg(hsotg->dev, "a_peripheral->a_host\n"); /* Clear the a_peripheral flag, back to a_host */ spin_unlock(&hsotg->lock); dwc2_hcd_start(hsotg); spin_lock(&hsotg->lock); hsotg->op_state = OTG_STATE_A_HOST; } } /* Change to L2 (suspend) state */ hsotg->lx_state = DWC2_L2; /* Clear interrupt */ writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS); }
/* * This interrupt indicates that the DWC_otg controller has detected a * resume or remote wakeup sequence. If the DWC_otg controller is in * low power mode, the handler must brings the controller out of low * power mode. The controller automatically begins resume signaling. * The handler schedules a time to stop resume signaling. */ static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg) { dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n"); dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state); if (dwc2_is_device_mode(hsotg)) { dev_dbg(hsotg->dev, "DSTS=0x%0x\n", readl(hsotg->regs + DSTS)); if (hsotg->lx_state == DWC2_L2) { u32 dctl = readl(hsotg->regs + DCTL); /* Clear Remote Wakeup Signaling */ dctl &= ~DCTL_RMTWKUPSIG; writel(dctl, hsotg->regs + DCTL); } /* Change to L0 state */ hsotg->lx_state = DWC2_L0; } else { if (hsotg->lx_state != DWC2_L1) { u32 pcgcctl = readl(hsotg->regs + PCGCTL); /* Restart the Phy Clock */ pcgcctl &= ~PCGCTL_STOPPCLK; writel(pcgcctl, hsotg->regs + PCGCTL); mod_timer(&hsotg->wkp_timer, jiffies + msecs_to_jiffies(71)); } else { /* Change to L0 state */ hsotg->lx_state = DWC2_L0; } } /* Clear interrupt */ writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS); }
static int __maybe_unused dwc2_suspend(struct device *dev) { struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev); int ret = 0; if (dwc2_is_device_mode(dwc2)) dwc2_hsotg_suspend(dwc2); if (dwc2->ll_hw_enabled) ret = __dwc2_lowlevel_hw_disable(dwc2); return ret; }
/** * dwc2_handle_session_req_intr() - This interrupt indicates that a device is * initiating the Session Request Protocol to request the host to turn on bus * power so a new session can begin * * @hsotg: Programming view of DWC_otg controller * * This handler responds by turning on bus power. If the DWC_otg controller is * in low power mode, this handler brings the controller out of low power mode * before turning on bus power. */ static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg) { dev_dbg(hsotg->dev, "++Session Request Interrupt++\n"); /* Clear interrupt */ DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_SESSREQINT); /* * Report disconnect if there is any previous session established */ if (dwc2_is_device_mode(hsotg)) s3c_hsotg_disconnect(hsotg); }
/* * Common interrupt handler * * The common interrupts are those that occur in both Host and Device mode. * This handler handles the following interrupts: * - Mode Mismatch Interrupt * - OTG Interrupt * - Connector ID Status Change Interrupt * - Disconnect Interrupt * - Session Request Interrupt * - Resume / Remote Wakeup Detected Interrupt * - Suspend Interrupt */ irqreturn_t dwc2_handle_common_intr(int irq, void *dev) { struct dwc2_hsotg *hsotg = dev; u32 gintsts; irqreturn_t retval = IRQ_NONE; spin_lock(&hsotg->lock); if (!dwc2_is_controller_alive(hsotg)) { dev_warn(hsotg->dev, "Controller is dead\n"); goto out; } gintsts = dwc2_read_common_intr(hsotg); if (gintsts & ~GINTSTS_PRTINT) retval = IRQ_HANDLED; if (gintsts & GINTSTS_MODEMIS) dwc2_handle_mode_mismatch_intr(hsotg); if (gintsts & GINTSTS_OTGINT) dwc2_handle_otg_intr(hsotg); if (gintsts & GINTSTS_CONIDSTSCHNG) dwc2_handle_conn_id_status_change_intr(hsotg); if (gintsts & GINTSTS_DISCONNINT) dwc2_handle_disconnect_intr(hsotg); if (gintsts & GINTSTS_SESSREQINT) dwc2_handle_session_req_intr(hsotg); if (gintsts & GINTSTS_WKUPINT) dwc2_handle_wakeup_detected_intr(hsotg); if (gintsts & GINTSTS_USBSUSP) dwc2_handle_usb_suspend_intr(hsotg); if (gintsts & GINTSTS_PRTINT) { /* * The port interrupt occurs while in device mode with HPRT0 * Port Enable/Disable */ if (dwc2_is_device_mode(hsotg)) { dev_dbg(hsotg->dev, " --Port interrupt received in Device mode--\n"); dwc2_handle_usb_port_intr(hsotg); retval = IRQ_HANDLED; } } out: spin_unlock(&hsotg->lock); return retval; }
static int __maybe_unused dwc2_resume(struct device *dev) { struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev); int ret = 0; if (dwc2->ll_hw_enabled) { ret = __dwc2_lowlevel_hw_enable(dwc2); if (ret) return ret; } if (dwc2_is_device_mode(dwc2)) ret = dwc2_hsotg_resume(dwc2); return ret; }
/* * This interrupt indicates that the DWC_otg controller has detected a * resume or remote wakeup sequence. If the DWC_otg controller is in * low power mode, the handler must brings the controller out of low * power mode. The controller automatically begins resume signaling. * The handler schedules a time to stop resume signaling. */ static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg) { int ret; dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n"); dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state); if (dwc2_is_device_mode(hsotg)) { dev_dbg(hsotg->dev, "DSTS=0x%0x\n", DWC2_READ_4(hsotg, DSTS)); if (hsotg->lx_state == DWC2_L2) { u32 dctl = DWC2_READ_4(hsotg, DCTL); /* Clear Remote Wakeup Signaling */ dctl &= ~DCTL_RMTWKUPSIG; DWC2_WRITE_4(hsotg, DCTL, dctl); ret = dwc2_exit_hibernation(hsotg, true); if (ret && (ret != -ENOTSUPP)) dev_err(hsotg->dev, "exit hibernation failed\n"); call_gadget(hsotg, resume); } /* Change to L0 state */ hsotg->lx_state = DWC2_L0; } else { if (hsotg->lx_state != DWC2_L1) { u32 pcgcctl = DWC2_READ_4(hsotg, PCGCTL); /* Restart the Phy Clock */ pcgcctl &= ~PCGCTL_STOPPCLK; DWC2_WRITE_4(hsotg, PCGCTL, pcgcctl); callout_reset(&hsotg->wkp_timer, mstohz(71), dwc2_wakeup_detected, hsotg); } else { /* Change to L0 state */ hsotg->lx_state = DWC2_L0; } } /* Clear interrupt */ DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_WKUPINT); }
/* * This interrupt indicates that SUSPEND state has been detected on the USB. * * For HNP the USB Suspend interrupt signals the change from "a_peripheral" * to "a_host". * * When power management is enabled the core will be put in low power mode. */ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg) { u32 dsts; int ret; dev_dbg(hsotg->dev, "USB SUSPEND\n"); if (dwc2_is_device_mode(hsotg)) { /* * Check the Device status register to determine if the Suspend * state is active */ dsts = DWC2_READ_4(hsotg, DSTS); dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts); dev_dbg(hsotg->dev, "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n", !!(dsts & DSTS_SUSPSTS), hsotg->hw_params.power_optimized); if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) { /* Ignore suspend request before enumeration */ if (!dwc2_is_device_connected(hsotg)) { dev_dbg(hsotg->dev, "ignore suspend request before enumeration\n"); goto clear_int; } ret = dwc2_enter_hibernation(hsotg); if (ret) { if (ret != -ENOTSUPP) dev_err(hsotg->dev, "enter hibernation failed\n"); goto skip_power_saving; } udelay(100); /* Ask phy to be suspended */ if (!IS_ERR_OR_NULL(hsotg->uphy)) usb_phy_set_suspend(hsotg->uphy, true); skip_power_saving: /* * Change to L2 (suspend) state before releasing * spinlock */ hsotg->lx_state = DWC2_L2; /* Call gadget suspend callback */ call_gadget(hsotg, suspend); } } else { if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) { dev_dbg(hsotg->dev, "a_peripheral->a_host\n"); /* Change to L2 (suspend) state */ hsotg->lx_state = DWC2_L2; /* Clear the a_peripheral flag, back to a_host */ spin_unlock(&hsotg->lock); dwc2_hcd_start(hsotg); spin_lock(&hsotg->lock); hsotg->op_state = OTG_STATE_A_HOST; } } clear_int: /* Clear interrupt */ DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_USBSUSP); }
/** * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG * Interrupt Register (GOTGINT) to determine what interrupt has occurred. * * @hsotg: Programming view of DWC_otg controller */ static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg) { u32 gotgint; u32 gotgctl; u32 gintmsk; gotgint = DWC2_READ_4(hsotg, GOTGINT); gotgctl = DWC2_READ_4(hsotg, GOTGCTL); dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint, dwc2_op_state_str(hsotg)); if (gotgint & GOTGINT_SES_END_DET) { dev_dbg(hsotg->dev, " ++OTG Interrupt: Session End Detected++ (%s)\n", dwc2_op_state_str(hsotg)); gotgctl = DWC2_READ_4(hsotg, GOTGCTL); if (dwc2_is_device_mode(hsotg)) s3c_hsotg_disconnect(hsotg); if (hsotg->op_state == OTG_STATE_B_HOST) { hsotg->op_state = OTG_STATE_B_PERIPHERAL; } else { /* * If not B_HOST and Device HNP still set, HNP did * not succeed! */ if (gotgctl & GOTGCTL_DEVHNPEN) { dev_dbg(hsotg->dev, "Session End Detected\n"); dev_err(hsotg->dev, "Device Not Connected/Responding!\n"); } /* * If Session End Detected the B-Cable has been * disconnected */ /* Reset to a clean state */ hsotg->lx_state = DWC2_L0; } gotgctl = DWC2_READ_4(hsotg, GOTGCTL); gotgctl &= ~GOTGCTL_DEVHNPEN; DWC2_WRITE_4(hsotg, GOTGCTL, gotgctl); } if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) { dev_dbg(hsotg->dev, " ++OTG Interrupt: Session Request Success Status Change++\n"); gotgctl = DWC2_READ_4(hsotg, GOTGCTL); if (gotgctl & GOTGCTL_SESREQSCS) { if (hsotg->core_params->phy_type == DWC2_PHY_TYPE_PARAM_FS && hsotg->core_params->i2c_enable > 0) { hsotg->srp_success = 1; } else { /* Clear Session Request */ gotgctl = DWC2_READ_4(hsotg, GOTGCTL); gotgctl &= ~GOTGCTL_SESREQ; DWC2_WRITE_4(hsotg, GOTGCTL, gotgctl); } } } if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) { /* * Print statements during the HNP interrupt handling * can cause it to fail */ gotgctl = DWC2_READ_4(hsotg, GOTGCTL); /* * WA for 3.00a- HW is not setting cur_mode, even sometimes * this does not help */ if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) udelay(100); if (gotgctl & GOTGCTL_HSTNEGSCS) { if (dwc2_is_host_mode(hsotg)) { hsotg->op_state = OTG_STATE_B_HOST; /* * Need to disable SOF interrupt immediately. * When switching from device to host, the PCD * interrupt handler won't handle the interrupt * if host mode is already set. The HCD * interrupt handler won't get called if the * HCD state is HALT. This means that the * interrupt does not get handled and Linux * complains loudly. */ gintmsk = DWC2_READ_4(hsotg, GINTMSK); gintmsk &= ~GINTSTS_SOF; DWC2_WRITE_4(hsotg, GINTMSK, gintmsk); /* * Call callback function with spin lock * released */ spin_unlock(&hsotg->lock); /* Initialize the Core for Host mode */ dwc2_hcd_start(hsotg); spin_lock(&hsotg->lock); hsotg->op_state = OTG_STATE_B_HOST; } } else { gotgctl = DWC2_READ_4(hsotg, GOTGCTL); gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN); DWC2_WRITE_4(hsotg, GOTGCTL, gotgctl); dev_dbg(hsotg->dev, "HNP Failed\n"); dev_err(hsotg->dev, "Device Not Connected/Responding\n"); } } if (gotgint & GOTGINT_HST_NEG_DET) { /* * The disconnect interrupt is set at the same time as * Host Negotiation Detected. During the mode switch all * interrupts are cleared so the disconnect interrupt * handler will not get executed. */ dev_dbg(hsotg->dev, " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n", (dwc2_is_host_mode(hsotg) ? "Host" : "Device")); if (dwc2_is_device_mode(hsotg)) { dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n", hsotg->op_state); spin_unlock(&hsotg->lock); dwc2_hcd_disconnect(hsotg); spin_lock(&hsotg->lock); hsotg->op_state = OTG_STATE_A_PERIPHERAL; } else { /* Need to disable SOF interrupt immediately */ gintmsk = DWC2_READ_4(hsotg, GINTMSK); gintmsk &= ~GINTSTS_SOF; DWC2_WRITE_4(hsotg, GINTMSK, gintmsk); spin_unlock(&hsotg->lock); dwc2_hcd_start(hsotg); spin_lock(&hsotg->lock); hsotg->op_state = OTG_STATE_A_HOST; } } if (gotgint & GOTGINT_A_DEV_TOUT_CHG) dev_dbg(hsotg->dev, " ++OTG Interrupt: A-Device Timeout Change++\n"); if (gotgint & GOTGINT_DBNCE_DONE) dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n"); /* Clear GOTGINT */ DWC2_WRITE_4(hsotg, GOTGINT, gotgint); }