dwc_otg_cil_intr.c

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/* ==========================================================================
 * $File: //dwh/usb_iip/dev/software/otg/linux/drivers/dwc_otg_cil_intr.c $
 * $Revision: #15 $
 * $Date: 2009/04/15 $
 * $Change: 1234129 $
 *
 * Synopsys HS OTG Linux Software Driver and documentation (hereinafter,
 * "Software") is an Unsupported proprietary work of Synopsys, Inc. unless
 * otherwise expressly agreed to in writing between Synopsys and you.
 *
 * The Software IS NOT an item of Licensed Software or Licensed Product under
 * any End User Software License Agreement or Agreement for Licensed Product
 * with Synopsys or any supplement thereto. You are permitted to use and
 * redistribute this Software in source and binary forms, with or without
 * modification, provided that redistributions of source code must retain this
 * notice. You may not view, use, disclose, copy or distribute this file or
 * any information contained herein except pursuant to this license grant from
 * Synopsys. If you do not agree with this notice, including the disclaimer
 * below, then you are not authorized to use the Software.
 *
 * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" BASIS
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 * ========================================================================== */

#include "dwc_os.h"
#include "dwc_otg_regs.h"
#include "dwc_otg_cil.h"

#ifdef DEBUG
inline const char *op_state_str(dwc_otg_core_if_t * core_if)
{
        return (core_if->op_state == A_HOST ? "a_host" :
                (core_if->op_state == A_SUSPEND ? "a_suspend" :
                 (core_if->op_state == A_PERIPHERAL ? "a_peripheral" :
                  (core_if->op_state == B_PERIPHERAL ? "b_peripheral" :
                   (core_if->op_state == B_HOST ? "b_host" : "unknown")))));
}
#endif

int32_t dwc_otg_handle_mode_mismatch_intr(dwc_otg_core_if_t * core_if)
{
        gintsts_data_t gintsts;
        DWC_WARN("Mode Mismatch Interrupt: currently in %s mode\n",
                 dwc_otg_mode(core_if) ? "Host" : "Device");

        /* Clear interrupt */
        gintsts.d32 = 0;
        gintsts.b.modemismatch = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);
        return 1;
}

static inline void hcd_start(dwc_otg_core_if_t * core_if)
{
        if (core_if->hcd_cb && core_if->hcd_cb->start) {
                core_if->hcd_cb->start(core_if->hcd_cb->p);
        }
}

static inline void hcd_stop(dwc_otg_core_if_t * core_if)
{
        if (core_if->hcd_cb && core_if->hcd_cb->stop) {
                core_if->hcd_cb->stop(core_if->hcd_cb->p);
        }
}

static inline void hcd_disconnect(dwc_otg_core_if_t * core_if)
{
        if (core_if->hcd_cb && core_if->hcd_cb->disconnect) {
                core_if->hcd_cb->disconnect(core_if->hcd_cb->p);
        }
}

static inline void hcd_session_start(dwc_otg_core_if_t * core_if)
{
        if (core_if->hcd_cb && core_if->hcd_cb->session_start) {
                core_if->hcd_cb->session_start(core_if->hcd_cb->p);
        }
}

#ifdef CONFIG_USB_DWC_OTG_LPM

static inline void hcd_sleep(dwc_otg_core_if_t * core_if)
{
        if (core_if->hcd_cb && core_if->hcd_cb->sleep) {
                core_if->hcd_cb->sleep(core_if->hcd_cb->p);
        }
}
#endif

static inline void hcd_resume(dwc_otg_core_if_t * core_if)
{
        if (core_if->hcd_cb && core_if->hcd_cb->resume_wakeup) {
                core_if->hcd_cb->resume_wakeup(core_if->hcd_cb->p);
        }
}

static inline void pcd_start(dwc_otg_core_if_t * core_if)
{
        if (core_if->pcd_cb && core_if->pcd_cb->start) {
                core_if->pcd_cb->start(core_if->pcd_cb->p);
        }
}

static inline void pcd_stop(dwc_otg_core_if_t * core_if)
{
        if (core_if->pcd_cb && core_if->pcd_cb->stop) {
                core_if->pcd_cb->stop(core_if->pcd_cb->p);
        }
}

static inline void pcd_suspend(dwc_otg_core_if_t * core_if)
{
        if (core_if->pcd_cb && core_if->pcd_cb->suspend) {
                core_if->pcd_cb->suspend(core_if->pcd_cb->p);
        }
}

static inline void pcd_resume(dwc_otg_core_if_t * core_if)
{
        if (core_if->pcd_cb && core_if->pcd_cb->resume_wakeup) {
                core_if->pcd_cb->resume_wakeup(core_if->pcd_cb->p);
        }
}

int32_t dwc_otg_handle_otg_intr(dwc_otg_core_if_t * core_if)
{
        dwc_otg_core_global_regs_t *global_regs = core_if->core_global_regs;
        gotgint_data_t gotgint;
        gotgctl_data_t gotgctl;
        gintmsk_data_t gintmsk;

        gotgint.d32 = dwc_read_reg32(&global_regs->gotgint);
        gotgctl.d32 = dwc_read_reg32(&global_regs->gotgctl);
        DWC_DEBUGPL(DBG_CIL, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint.d32,
                    op_state_str(core_if));

        if (gotgint.b.sesenddet) {
                DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
                            "Session End Detected++ (%s)\n",
                            op_state_str(core_if));
                gotgctl.d32 = dwc_read_reg32(&global_regs->gotgctl);

                if (core_if->op_state == B_HOST) {
                        pcd_start(core_if);
                        core_if->op_state = B_PERIPHERAL;
                } else {
                        /* If not B_HOST and Device HNP still set. HNP
                         * Did not succeed!*/
                        if (gotgctl.b.devhnpen) {
                                DWC_DEBUGPL(DBG_ANY, "Session End Detected\n");
                                __DWC_ERROR("Device Not Connected/Responding!\n");
                        }

                        /* If Session End Detected the B-Cable has
                         * been disconnected. */
                        /* Reset PCD and Gadget driver to a
                         * clean state. */
                        core_if->lx_state = DWC_OTG_L0;
                        pcd_stop(core_if);
                }
                gotgctl.d32 = 0;
                gotgctl.b.devhnpen = 1;
                dwc_modify_reg32(&global_regs->gotgctl, gotgctl.d32, 0);
        }
        if (gotgint.b.sesreqsucstschng) {
                DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
                            "Session Reqeust Success Status Change++\n");
                gotgctl.d32 = dwc_read_reg32(&global_regs->gotgctl);
                if (gotgctl.b.sesreqscs) {
                        if ((core_if->core_params->phy_type ==
                             DWC_PHY_TYPE_PARAM_FS) && (core_if->core_params->i2c_enable)) {
                                core_if->srp_success = 1;
                        } else {
                                pcd_resume(core_if);
                                /* Clear Session Request */
                                gotgctl.d32 = 0;
                                gotgctl.b.sesreq = 1;
                                dwc_modify_reg32(&global_regs->gotgctl,
                                                 gotgctl.d32, 0);
                        }
                }
        }
        if (gotgint.b.hstnegsucstschng) {
                /* Print statements during the HNP interrupt handling
                 * can cause it to fail.*/
                gotgctl.d32 = dwc_read_reg32(&global_regs->gotgctl);
                if (gotgctl.b.hstnegscs) {
                        if (dwc_otg_is_host_mode(core_if)) {
                                core_if->op_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.d32 = 0;
                                gintmsk.b.sofintr = 1;
                                dwc_modify_reg32(&global_regs->gintmsk,
                                                 gintmsk.d32, 0);
                                pcd_stop(core_if);
                                /*
                                 * Initialize the Core for Host mode.
                                 */
                                hcd_start(core_if);
                                core_if->op_state = B_HOST;
                        }
                } else {
                        gotgctl.d32 = 0;
                        gotgctl.b.hnpreq = 1;
                        gotgctl.b.devhnpen = 1;
                        dwc_modify_reg32(&global_regs->gotgctl, gotgctl.d32, 0);
                        DWC_DEBUGPL(DBG_ANY, "HNP Failed\n");
                        __DWC_ERROR("Device Not Connected/Responding\n");
                }
        }
        if (gotgint.b.hstnegdet) {
                /* 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.
                 */
                DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
                            "Host Negotiation Detected++ (%s)\n",
                            (dwc_otg_is_host_mode(core_if) ? "Host" :
                             "Device"));
                if (dwc_otg_is_device_mode(core_if)) {
                        DWC_DEBUGPL(DBG_ANY, "a_suspend->a_peripheral (%d)\n",
                                    core_if->op_state);
                        hcd_disconnect(core_if);
                        pcd_start(core_if);
                        core_if->op_state = A_PERIPHERAL;
                } else {
                        /*
                         * 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.d32 = 0;
                        gintmsk.b.sofintr = 1;
                        dwc_modify_reg32(&global_regs->gintmsk, gintmsk.d32, 0);
                        pcd_stop(core_if);
                        hcd_start(core_if);
                        core_if->op_state = A_HOST;
                }
        }
        if (gotgint.b.adevtoutchng) {
                DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
                            "A-Device Timeout Change++\n");
        }
        if (gotgint.b.debdone) {
                DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: " "Debounce Done++\n");
        }

        /* Clear GOTGINT */
        dwc_write_reg32(&core_if->core_global_regs->gotgint, gotgint.d32);

        return 1;
}

void w_conn_id_status_change(void *p)
{
        dwc_otg_core_if_t *core_if = p;
        uint32_t count = 0;
        gotgctl_data_t gotgctl = {.d32 = 0 };

        gotgctl.d32 = dwc_read_reg32(&core_if->core_global_regs->gotgctl);
        DWC_DEBUGPL(DBG_CIL, "gotgctl=%0x\n", gotgctl.d32);
        DWC_DEBUGPL(DBG_CIL, "gotgctl.b.conidsts=%d\n", gotgctl.b.conidsts);

        /* B-Device connector (Device Mode) */
        if (gotgctl.b.conidsts) {
                /* Wait for switch to device mode. */
                while (!dwc_otg_is_device_mode(core_if)) {
                        DWC_PRINTF("Waiting for Peripheral Mode, Mode=%s\n",
                                   (dwc_otg_is_host_mode(core_if) ? "Host" :
                                    "Peripheral"));
                        dwc_mdelay(100);
                        if (++count > 10000)
                                break;
                }
                DWC_ASSERT(++count < 10000,
                           "Connection id status change timed out");
                core_if->op_state = B_PERIPHERAL;
                dwc_otg_core_init(core_if);
                dwc_otg_enable_global_interrupts(core_if);
                pcd_start(core_if);
        } else {
                /* A-Device connector (Host Mode) */
                while (!dwc_otg_is_host_mode(core_if)) {
                        DWC_PRINTF("Waiting for Host Mode, Mode=%s\n",
                                   (dwc_otg_is_host_mode(core_if) ? "Host" :
                                    "Peripheral"));
                        dwc_mdelay(100);
                        if (++count > 10000)
                                break;
                }
                DWC_ASSERT(++count < 10000,
                           "Connection id status change timed out");
                core_if->op_state = A_HOST;
                /*
                 * Initialize the Core for Host mode.
                 */
                dwc_otg_core_init(core_if);
                dwc_otg_enable_global_interrupts(core_if);
                hcd_start(core_if);
        }
}

int32_t dwc_otg_handle_conn_id_status_change_intr(dwc_otg_core_if_t * core_if)
{

        /*
         * Need to disable SOF interrupt immediately. If 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_data_t gintmsk = {.d32 = 0 };
        gintsts_data_t gintsts = {.d32 = 0 };

        gintmsk.b.sofintr = 1;
        dwc_modify_reg32(&core_if->core_global_regs->gintmsk, gintmsk.d32, 0);

        DWC_DEBUGPL(DBG_CIL,
                    " ++Connector ID Status Change Interrupt++  (%s)\n",
                    (dwc_otg_is_host_mode(core_if) ? "Host" : "Device"));

        /*
         * Need to schedule a work, as there are possible DELAY function calls
         */
        DWC_WORKQ_SCHEDULE(core_if->wq_otg, w_conn_id_status_change,
                           core_if, "connection id status change");

        /* Set flag and clear interrupt */
        gintsts.b.conidstschng = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);

        return 1;
}

int32_t dwc_otg_handle_session_req_intr(dwc_otg_core_if_t * core_if)
{
        hprt0_data_t hprt0;
        gintsts_data_t gintsts;

#ifndef DWC_HOST_ONLY
        DWC_DEBUGPL(DBG_ANY, "++Session Request Interrupt++\n");

        if (dwc_otg_is_device_mode(core_if)) {
                DWC_PRINTF("SRP: Device mode\n");
        } else {
                DWC_PRINTF("SRP: Host mode\n");

                /* Turn on the port power bit. */
                hprt0.d32 = dwc_otg_read_hprt0(core_if);
                hprt0.b.prtpwr = 1;
                dwc_write_reg32(core_if->host_if->hprt0, hprt0.d32);

                /* Start the Connection timer. So a message can be displayed
                 * if connect does not occur within 10 seconds. */
                hcd_session_start(core_if);
        }
#endif

        /* Clear interrupt */
        gintsts.d32 = 0;
        gintsts.b.sessreqintr = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);

        return 1;
}

void w_wakeup_detected(void *p)
{
        dwc_otg_core_if_t *core_if = (dwc_otg_core_if_t *) p;
        /*
         * Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms
         * so that OPT tests pass with all PHYs).
         */
        hprt0_data_t hprt0 = {.d32 = 0 };
#if 0
        pcgcctl_data_t pcgcctl = {.d32 = 0 };
        /* Restart the Phy Clock */
        pcgcctl.b.stoppclk = 1;
        dwc_modify_reg32(core_if->pcgcctl, pcgcctl.d32, 0);
        dwc_udelay(10);
#endif                          //0
        hprt0.d32 = dwc_otg_read_hprt0(core_if);
        DWC_DEBUGPL(DBG_ANY, "Resume: HPRT0=%0x\n", hprt0.d32);
//      dwc_mdelay(70);
        hprt0.b.prtres = 0;     /* Resume */
        dwc_write_reg32(core_if->host_if->hprt0, hprt0.d32);
        DWC_DEBUGPL(DBG_ANY, "Clear Resume: HPRT0=%0x\n",
                    dwc_read_reg32(core_if->host_if->hprt0));

        hcd_resume(core_if);

        core_if->lx_state = DWC_OTG_L0;

}

int32_t dwc_otg_handle_wakeup_detected_intr(dwc_otg_core_if_t * core_if)
{
        gintsts_data_t gintsts;

        DWC_DEBUGPL(DBG_ANY,
                    "++Resume and Remote Wakeup Detected Interrupt++\n");

        DWC_PRINTF("%s lxstate = %d\n", __func__, core_if->lx_state);

        if (dwc_otg_is_device_mode(core_if)) {
                dctl_data_t dctl = {.d32 = 0 };
                DWC_DEBUGPL(DBG_PCD, "DSTS=0x%0x\n",
                            dwc_read_reg32(&core_if->dev_if->dev_global_regs->
                                           dsts));
                if (core_if->lx_state == DWC_OTG_L2) {
#ifdef PARTIAL_POWER_DOWN
                        if (core_if->hwcfg4.b.power_optimiz) {
                                pcgcctl_data_t power = {.d32 = 0 };

                                power.d32 = dwc_read_reg32(core_if->pcgcctl);
                                DWC_DEBUGPL(DBG_CIL, "PCGCCTL=%0x\n",
                                            power.d32);

                                power.b.stoppclk = 0;
                                dwc_write_reg32(core_if->pcgcctl, power.d32);

                                power.b.pwrclmp = 0;
                                dwc_write_reg32(core_if->pcgcctl, power.d32);

                                power.b.rstpdwnmodule = 0;
                                dwc_write_reg32(core_if->pcgcctl, power.d32);
                        }
#endif
                        /* Clear the Remote Wakeup Signalling */
                        dctl.b.rmtwkupsig = 1;
                        dwc_modify_reg32(&core_if->dev_if->dev_global_regs->
                                         dctl, dctl.d32, 0);

                        if (core_if->pcd_cb && core_if->pcd_cb->resume_wakeup) {
                                core_if->pcd_cb->resume_wakeup(core_if->pcd_cb->
                                                               p);
                        }
                } else {
                        glpmcfg_data_t lpmcfg;
                        lpmcfg.d32 =
                            dwc_read_reg32(&core_if->core_global_regs->glpmcfg);
                        lpmcfg.b.hird_thres &= (~(1 << 4));
                        dwc_write_reg32(&core_if->core_global_regs->glpmcfg,
                                        lpmcfg.d32);
                }
                core_if->lx_state = DWC_OTG_L0;
        } else {
                if (core_if->lx_state != DWC_OTG_L1) {
                        pcgcctl_data_t pcgcctl = {.d32 = 0 };

                        /* Restart the Phy Clock */
                        pcgcctl.b.stoppclk = 1;
                        dwc_modify_reg32(core_if->pcgcctl, pcgcctl.d32, 0);

                        DWC_TIMER_SCHEDULE(core_if->wkp_timer, 71);
                } else {
                        core_if->lx_state = DWC_OTG_L0;
                }
        }

        /* Clear interrupt */
        gintsts.d32 = 0;
        gintsts.b.wkupintr = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);

        return 1;
}

int32_t dwc_otg_handle_disconnect_intr(dwc_otg_core_if_t * core_if)
{
        gintsts_data_t gintsts;

        DWC_DEBUGPL(DBG_ANY, "++Disconnect Detected Interrupt++ (%s) %s\n",
                    (dwc_otg_is_host_mode(core_if) ? "Host" : "Device"),
                    op_state_str(core_if));

#ifndef DWC_HOST_ONLY
        if (core_if->op_state == B_HOST) {
                /* If in device mode Disconnect and stop the HCD, then
                 * start the PCD. */
                hcd_disconnect(core_if);
                pcd_start(core_if);
                core_if->op_state = B_PERIPHERAL;
        } else if (dwc_otg_is_device_mode(core_if)) {
                gotgctl_data_t gotgctl = {.d32 = 0 };
                gotgctl.d32 =
                    dwc_read_reg32(&core_if->core_global_regs->gotgctl);
                if (gotgctl.b.hstsethnpen == 1) {
                        /* Do nothing, if HNP in process the OTG
                         * interrupt "Host Negotiation Detected"
                         * interrupt will do the mode switch.
                         */
                } else if (gotgctl.b.devhnpen == 0) {
                        /* If in device mode Disconnect and stop the HCD, then
                         * start the PCD. */
                        hcd_disconnect(core_if);
                        pcd_start(core_if);
                        core_if->op_state = B_PERIPHERAL;
                } else {
                        DWC_DEBUGPL(DBG_ANY, "!a_peripheral && !devhnpen\n");
                }
        } else {
                if (core_if->op_state == A_HOST) {
                        /* A-Cable still connected but device disconnected. */
                        hcd_disconnect(core_if);
                }
        }
#endif
        /* Change to L3(OFF) state */
        core_if->lx_state = DWC_OTG_L3;

        gintsts.d32 = 0;
        gintsts.b.disconnect = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);
        return 1;
}

int32_t dwc_otg_handle_usb_suspend_intr(dwc_otg_core_if_t * core_if)
{
        dsts_data_t dsts;
        gintsts_data_t gintsts;

        DWC_DEBUGPL(DBG_ANY, "USB SUSPEND\n");

        if (dwc_otg_is_device_mode(core_if)) {
                /* Check the Device status register to determine if the Suspend
                 * state is active. */
                dsts.d32 =
                    dwc_read_reg32(&core_if->dev_if->dev_global_regs->dsts);
                DWC_DEBUGPL(DBG_PCD, "DSTS=0x%0x\n", dsts.d32);
                DWC_DEBUGPL(DBG_PCD, "DSTS.Suspend Status=%d "
                            "HWCFG4.power Optimize=%d\n",
                            dsts.b.suspsts, core_if->hwcfg4.b.power_optimiz);

#ifdef PARTIAL_POWER_DOWN

                if (dsts.b.suspsts && core_if->hwcfg4.b.power_optimiz) {
                        pcgcctl_data_t power = {.d32 = 0 };
                        DWC_DEBUGPL(DBG_CIL, "suspend\n");

                        power.b.pwrclmp = 1;
                        dwc_write_reg32(core_if->pcgcctl, power.d32);

                        power.b.rstpdwnmodule = 1;
                        dwc_modify_reg32(core_if->pcgcctl, 0, power.d32);

                        power.b.stoppclk = 1;
                        dwc_modify_reg32(core_if->pcgcctl, 0, power.d32);

                } else {
                        DWC_DEBUGPL(DBG_ANY, "disconnect?\n");
                }
#endif
                /* PCD callback for suspend. */
                pcd_suspend(core_if);
        } else {
                if (core_if->op_state == A_PERIPHERAL) {
                        DWC_DEBUGPL(DBG_ANY, "a_peripheral->a_host\n");
                        /* Clear the a_peripheral flag, back to a_host. */
                        pcd_stop(core_if);
                        hcd_start(core_if);
                        core_if->op_state = A_HOST;
                }
        }

        /* Change to L2(suspend) state */
        core_if->lx_state = DWC_OTG_L2;

        /* Clear interrupt */
        gintsts.d32 = 0;
        gintsts.b.usbsuspend = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);

        return 1;
}

#ifdef CONFIG_USB_DWC_OTG_LPM

static int32_t dwc_otg_handle_lpm_intr(dwc_otg_core_if_t * core_if)
{
        glpmcfg_data_t lpmcfg;
        gintsts_data_t gintsts;

        if (!core_if->core_params->lpm_enable) {
                DWC_PRINTF("Unexpected LPM interrupt\n");
        }

        lpmcfg.d32 = dwc_read_reg32(&core_if->core_global_regs->glpmcfg);
        DWC_PRINTF("LPM config register = 0x%08x\n", lpmcfg.d32);

        if (dwc_otg_is_host_mode(core_if)) {
                hcd_sleep(core_if);
        } else {
                lpmcfg.b.hird_thres |= (1 << 4);
                dwc_write_reg32(&core_if->core_global_regs->glpmcfg,
                                lpmcfg.d32);
        }

        /* Examine prt_sleep_sts after TL1TokenTetry period max (10 us) */      
        dwc_udelay(10);
        lpmcfg.d32 = dwc_read_reg32(&core_if->core_global_regs->glpmcfg);
        if (lpmcfg.b.prt_sleep_sts) {
                /* Save the current state */
                core_if->lx_state = DWC_OTG_L1;
        }

        /* Clear interrupt  */
        gintsts.d32 = 0;
        gintsts.b.lpmtranrcvd = 1;
        dwc_write_reg32(&core_if->core_global_regs->gintsts, gintsts.d32);
        return 1;
}
#endif                          /* CONFIG_USB_DWC_OTG_LPM */

static inline uint32_t dwc_otg_read_common_intr(dwc_otg_core_if_t * core_if)
{
        gintsts_data_t gintsts;
        gintmsk_data_t gintmsk;
        gintmsk_data_t gintmsk_common = {.d32 = 0 };
        gintmsk_common.b.wkupintr = 1;
        gintmsk_common.b.sessreqintr = 1;
        gintmsk_common.b.conidstschng = 1;
        gintmsk_common.b.otgintr = 1;
        gintmsk_common.b.modemismatch = 1;
        gintmsk_common.b.disconnect = 1;
        gintmsk_common.b.usbsuspend = 1;
#ifdef CONFIG_USB_DWC_OTG_LPM
        gintmsk_common.b.lpmtranrcvd = 1;
#endif

        gintmsk_common.b.portintr = 1;

        gintsts.d32 = dwc_read_reg32(&core_if->core_global_regs->gintsts);
        gintmsk.d32 = dwc_read_reg32(&core_if->core_global_regs->gintmsk);
#ifdef DEBUG
        /* if any common interrupts set */
        if (gintsts.d32 & gintmsk_common.d32) {
                DWC_DEBUGPL(DBG_ANY, "gintsts=%08x  gintmsk=%08x\n",
                            gintsts.d32, gintmsk.d32);
        }
#endif

        return ((gintsts.d32 & gintmsk.d32) & gintmsk_common.d32);

}

int32_t dwc_otg_handle_common_intr(dwc_otg_core_if_t * core_if)
{
        int retval = 0;
        gintsts_data_t gintsts;

        gintsts.d32 = dwc_otg_read_common_intr(core_if);

        if (gintsts.b.modemismatch) {
                retval |= dwc_otg_handle_mode_mismatch_intr(core_if);
        }
        if (gintsts.b.otgintr) {
                retval |= dwc_otg_handle_otg_intr(core_if);
        }
        if (gintsts.b.conidstschng) {
                retval |= dwc_otg_handle_conn_id_status_change_intr(core_if);
        }
        if (gintsts.b.disconnect) {
                retval |= dwc_otg_handle_disconnect_intr(core_if);
        }
        if (gintsts.b.sessreqintr) {
                retval |= dwc_otg_handle_session_req_intr(core_if);
        }
        if (gintsts.b.wkupintr) {
                retval |= dwc_otg_handle_wakeup_detected_intr(core_if);
        }
        if (gintsts.b.usbsuspend) {
                retval |= dwc_otg_handle_usb_suspend_intr(core_if);
        }
#ifdef CONFIG_USB_DWC_OTG_LPM
        if (gintsts.b.lpmtranrcvd) {
                retval |= dwc_otg_handle_lpm_intr(core_if);
        }
#endif

        if (gintsts.b.portintr && dwc_otg_is_device_mode(core_if)) {
                /* The port interrupt occurs while in device mode with HPRT0
                 * Port Enable/Disable.
                 */
                gintsts.d32 = 0;
                gintsts.b.portintr = 1;
                dwc_write_reg32(&core_if->core_global_regs->gintsts,
                                gintsts.d32);
                retval |= 1;

        }
        return retval;
}

---