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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/dwc2/core_intr.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/dwc2/core_intr.c')
-rw-r--r--drivers/usb/dwc2/core_intr.c865
1 files changed, 865 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
new file mode 100644
index 000000000..158ede753
--- /dev/null
+++ b/drivers/usb/dwc2/core_intr.c
@@ -0,0 +1,865 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * core_intr.c - DesignWare HS OTG Controller common interrupt handling
+ *
+ * Copyright (C) 2004-2013 Synopsys, Inc.
+ */
+
+/*
+ * This file contains the common interrupt handlers
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#include <linux/usb/hcd.h>
+#include <linux/usb/ch11.h>
+
+#include "core.h"
+#include "hcd.h"
+
+static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
+{
+ switch (hsotg->op_state) {
+ case OTG_STATE_A_HOST:
+ return "a_host";
+ case OTG_STATE_A_SUSPEND:
+ return "a_suspend";
+ case OTG_STATE_A_PERIPHERAL:
+ return "a_peripheral";
+ case OTG_STATE_B_PERIPHERAL:
+ return "b_peripheral";
+ case OTG_STATE_B_HOST:
+ return "b_host";
+ default:
+ return "unknown";
+ }
+}
+
+/**
+ * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
+ * When the PRTINT interrupt fires, there are certain status bits in the Host
+ * Port that needs to get cleared.
+ *
+ * @hsotg: Programming view of DWC_otg controller
+ */
+static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
+{
+ u32 hprt0 = dwc2_readl(hsotg, HPRT0);
+
+ if (hprt0 & HPRT0_ENACHG) {
+ hprt0 &= ~HPRT0_ENA;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+ }
+}
+
+/**
+ * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
+ *
+ * @hsotg: Programming view of DWC_otg controller
+ */
+static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
+{
+ /* Clear interrupt */
+ dwc2_writel(hsotg, GINTSTS_MODEMIS, GINTSTS);
+
+ dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
+ dwc2_is_host_mode(hsotg) ? "Host" : "Device");
+}
+
+/**
+ * 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_readl(hsotg, GOTGINT);
+ gotgctl = dwc2_readl(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_readl(hsotg, GOTGCTL);
+
+ if (dwc2_is_device_mode(hsotg))
+ dwc2_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_readl(hsotg, GOTGCTL);
+ gotgctl &= ~GOTGCTL_DEVHNPEN;
+ dwc2_writel(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_readl(hsotg, GOTGCTL);
+ if (gotgctl & GOTGCTL_SESREQSCS) {
+ if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS &&
+ hsotg->params.i2c_enable) {
+ hsotg->srp_success = 1;
+ } else {
+ /* Clear Session Request */
+ gotgctl = dwc2_readl(hsotg, GOTGCTL);
+ gotgctl &= ~GOTGCTL_SESREQ;
+ dwc2_writel(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_readl(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_readl(hsotg, GINTMSK);
+ gintmsk &= ~GINTSTS_SOF;
+ dwc2_writel(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_readl(hsotg, GOTGCTL);
+ gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
+ dwc2_writel(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, false);
+ spin_lock(&hsotg->lock);
+ hsotg->op_state = OTG_STATE_A_PERIPHERAL;
+ } else {
+ /* Need to disable SOF interrupt immediately */
+ gintmsk = dwc2_readl(hsotg, GINTMSK);
+ gintmsk &= ~GINTSTS_SOF;
+ dwc2_writel(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_writel(hsotg, gotgint, GOTGINT);
+}
+
+/**
+ * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
+ * Change Interrupt
+ *
+ * @hsotg: Programming view of DWC_otg controller
+ *
+ * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
+ * Device to Host Mode transition or a Host to Device Mode transition. This only
+ * occurs when the cable is connected/removed from the PHY connector.
+ */
+static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
+{
+ u32 gintmsk;
+
+ /* Clear interrupt */
+ dwc2_writel(hsotg, GINTSTS_CONIDSTSCHNG, GINTSTS);
+
+ /* Need to disable SOF interrupt immediately */
+ gintmsk = dwc2_readl(hsotg, GINTMSK);
+ gintmsk &= ~GINTSTS_SOF;
+ dwc2_writel(hsotg, gintmsk, GINTMSK);
+
+ dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n",
+ dwc2_is_host_mode(hsotg) ? "Host" : "Device");
+
+ /*
+ * Need to schedule a work, as there are possible DELAY function calls.
+ */
+ if (hsotg->wq_otg)
+ queue_work(hsotg->wq_otg, &hsotg->wf_otg);
+}
+
+/**
+ * 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)
+{
+ int ret;
+ u32 hprt0;
+
+ /* Clear interrupt */
+ dwc2_writel(hsotg, GINTSTS_SESSREQINT, GINTSTS);
+
+ dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
+ hsotg->lx_state);
+
+ if (dwc2_is_device_mode(hsotg)) {
+ if (hsotg->lx_state == DWC2_L2) {
+ if (hsotg->in_ppd) {
+ ret = dwc2_exit_partial_power_down(hsotg, 0,
+ true);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit power_down failed\n");
+ }
+
+ /* Exit gadget mode clock gating. */
+ if (hsotg->params.power_down ==
+ DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+ dwc2_gadget_exit_clock_gating(hsotg, 0);
+ }
+
+ /*
+ * Report disconnect if there is any previous session
+ * established
+ */
+ dwc2_hsotg_disconnect(hsotg);
+ } else {
+ /* Turn on the port power bit. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_PWR;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+ /* Connect hcd after port power is set. */
+ dwc2_hcd_connect(hsotg);
+ }
+}
+
+/**
+ * dwc2_wakeup_from_lpm_l1 - Exit the device from LPM L1 state
+ *
+ * @hsotg: Programming view of DWC_otg controller
+ *
+ */
+static void dwc2_wakeup_from_lpm_l1(struct dwc2_hsotg *hsotg)
+{
+ u32 glpmcfg;
+ u32 i = 0;
+
+ if (hsotg->lx_state != DWC2_L1) {
+ dev_err(hsotg->dev, "Core isn't in DWC2_L1 state\n");
+ return;
+ }
+
+ glpmcfg = dwc2_readl(hsotg, GLPMCFG);
+ if (dwc2_is_device_mode(hsotg)) {
+ dev_dbg(hsotg->dev, "Exit from L1 state\n");
+ glpmcfg &= ~GLPMCFG_ENBLSLPM;
+ glpmcfg &= ~GLPMCFG_HIRD_THRES_EN;
+ dwc2_writel(hsotg, glpmcfg, GLPMCFG);
+
+ do {
+ glpmcfg = dwc2_readl(hsotg, GLPMCFG);
+
+ if (!(glpmcfg & (GLPMCFG_COREL1RES_MASK |
+ GLPMCFG_L1RESUMEOK | GLPMCFG_SLPSTS)))
+ break;
+
+ udelay(1);
+ } while (++i < 200);
+
+ if (i == 200) {
+ dev_err(hsotg->dev, "Failed to exit L1 sleep state in 200us.\n");
+ return;
+ }
+ dwc2_gadget_init_lpm(hsotg);
+ } else {
+ /* TODO */
+ dev_err(hsotg->dev, "Host side LPM is not supported.\n");
+ return;
+ }
+
+ /* Change to L0 state */
+ hsotg->lx_state = DWC2_L0;
+
+ /* Inform gadget to exit from L1 */
+ call_gadget(hsotg, resume);
+}
+
+/*
+ * 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;
+
+ /* Clear interrupt */
+ dwc2_writel(hsotg, GINTSTS_WKUPINT, GINTSTS);
+
+ dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
+ dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
+
+ if (hsotg->lx_state == DWC2_L1) {
+ dwc2_wakeup_from_lpm_l1(hsotg);
+ return;
+ }
+
+ if (dwc2_is_device_mode(hsotg)) {
+ dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
+ dwc2_readl(hsotg, DSTS));
+ if (hsotg->lx_state == DWC2_L2) {
+ if (hsotg->in_ppd) {
+ u32 dctl = dwc2_readl(hsotg, DCTL);
+ /* Clear Remote Wakeup Signaling */
+ dctl &= ~DCTL_RMTWKUPSIG;
+ dwc2_writel(hsotg, dctl, DCTL);
+ ret = dwc2_exit_partial_power_down(hsotg, 1,
+ true);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit partial_power_down failed\n");
+ call_gadget(hsotg, resume);
+ }
+
+ /* Exit gadget mode clock gating. */
+ if (hsotg->params.power_down ==
+ DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+ dwc2_gadget_exit_clock_gating(hsotg, 0);
+ } else {
+ /* Change to L0 state */
+ hsotg->lx_state = DWC2_L0;
+ }
+ } else {
+ if (hsotg->lx_state == DWC2_L2) {
+ if (hsotg->in_ppd) {
+ ret = dwc2_exit_partial_power_down(hsotg, 1,
+ true);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit partial_power_down failed\n");
+ }
+
+ if (hsotg->params.power_down ==
+ DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+ dwc2_host_exit_clock_gating(hsotg, 1);
+
+ /*
+ * If we've got this quirk then the PHY is stuck upon
+ * wakeup. Assert reset. This will propagate out and
+ * eventually we'll re-enumerate the device. Not great
+ * but the best we can do. We can't call phy_reset()
+ * at interrupt time but there's no hurry, so we'll
+ * schedule it for later.
+ */
+ if (hsotg->reset_phy_on_wake)
+ dwc2_host_schedule_phy_reset(hsotg);
+
+ mod_timer(&hsotg->wkp_timer,
+ jiffies + msecs_to_jiffies(71));
+ } else {
+ /* Change to L0 state */
+ hsotg->lx_state = DWC2_L0;
+ }
+ }
+}
+
+/*
+ * This interrupt indicates that a device has been disconnected from the
+ * root port
+ */
+static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
+{
+ dwc2_writel(hsotg, GINTSTS_DISCONNINT, GINTSTS);
+
+ dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
+ dwc2_is_host_mode(hsotg) ? "Host" : "Device",
+ dwc2_op_state_str(hsotg));
+
+ if (hsotg->op_state == OTG_STATE_A_HOST)
+ dwc2_hcd_disconnect(hsotg, false);
+}
+
+/*
+ * 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;
+
+ /* Clear interrupt */
+ dwc2_writel(hsotg, GINTSTS_USBSUSP, GINTSTS);
+
+ 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_readl(hsotg, DSTS);
+ dev_dbg(hsotg->dev, "%s: DSTS=0x%0x\n", __func__, dsts);
+ dev_dbg(hsotg->dev,
+ "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d HWCFG4.Hibernation=%d\n",
+ !!(dsts & DSTS_SUSPSTS),
+ hsotg->hw_params.power_optimized,
+ hsotg->hw_params.hibernation);
+
+ /* Ignore suspend request before enumeration */
+ if (!dwc2_is_device_connected(hsotg)) {
+ dev_dbg(hsotg->dev,
+ "ignore suspend request before enumeration\n");
+ return;
+ }
+ if (dsts & DSTS_SUSPSTS) {
+ switch (hsotg->params.power_down) {
+ case DWC2_POWER_DOWN_PARAM_PARTIAL:
+ ret = dwc2_enter_partial_power_down(hsotg);
+ if (ret)
+ dev_err(hsotg->dev,
+ "enter partial_power_down failed\n");
+
+ udelay(100);
+
+ /* Ask phy to be suspended */
+ if (!IS_ERR_OR_NULL(hsotg->uphy))
+ usb_phy_set_suspend(hsotg->uphy, true);
+ break;
+ case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ ret = dwc2_enter_hibernation(hsotg, 0);
+ if (ret)
+ dev_err(hsotg->dev,
+ "enter hibernation failed\n");
+ break;
+ case DWC2_POWER_DOWN_PARAM_NONE:
+ /*
+ * If neither hibernation nor partial power down are supported,
+ * clock gating is used to save power.
+ */
+ if (!hsotg->params.no_clock_gating)
+ dwc2_gadget_enter_clock_gating(hsotg);
+ }
+
+ /*
+ * 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;
+ }
+ }
+}
+
+/**
+ * dwc2_handle_lpm_intr - GINTSTS_LPMTRANRCVD Interrupt handler
+ *
+ * @hsotg: Programming view of DWC_otg controller
+ *
+ */
+static void dwc2_handle_lpm_intr(struct dwc2_hsotg *hsotg)
+{
+ u32 glpmcfg;
+ u32 pcgcctl;
+ u32 hird;
+ u32 hird_thres;
+ u32 hird_thres_en;
+ u32 enslpm;
+
+ /* Clear interrupt */
+ dwc2_writel(hsotg, GINTSTS_LPMTRANRCVD, GINTSTS);
+
+ glpmcfg = dwc2_readl(hsotg, GLPMCFG);
+
+ if (!(glpmcfg & GLPMCFG_LPMCAP)) {
+ dev_err(hsotg->dev, "Unexpected LPM interrupt\n");
+ return;
+ }
+
+ hird = (glpmcfg & GLPMCFG_HIRD_MASK) >> GLPMCFG_HIRD_SHIFT;
+ hird_thres = (glpmcfg & GLPMCFG_HIRD_THRES_MASK &
+ ~GLPMCFG_HIRD_THRES_EN) >> GLPMCFG_HIRD_THRES_SHIFT;
+ hird_thres_en = glpmcfg & GLPMCFG_HIRD_THRES_EN;
+ enslpm = glpmcfg & GLPMCFG_ENBLSLPM;
+
+ if (dwc2_is_device_mode(hsotg)) {
+ dev_dbg(hsotg->dev, "HIRD_THRES_EN = %d\n", hird_thres_en);
+
+ if (hird_thres_en && hird >= hird_thres) {
+ dev_dbg(hsotg->dev, "L1 with utmi_l1_suspend_n\n");
+ } else if (enslpm) {
+ dev_dbg(hsotg->dev, "L1 with utmi_sleep_n\n");
+ } else {
+ dev_dbg(hsotg->dev, "Entering Sleep with L1 Gating\n");
+
+ pcgcctl = dwc2_readl(hsotg, PCGCTL);
+ pcgcctl |= PCGCTL_ENBL_SLEEP_GATING;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+ }
+ /**
+ * Examine prt_sleep_sts after TL1TokenTetry period max (10 us)
+ */
+ udelay(10);
+
+ glpmcfg = dwc2_readl(hsotg, GLPMCFG);
+
+ if (glpmcfg & GLPMCFG_SLPSTS) {
+ /* Save the current state */
+ hsotg->lx_state = DWC2_L1;
+ dev_dbg(hsotg->dev,
+ "Core is in L1 sleep glpmcfg=%08x\n", glpmcfg);
+
+ /* Inform gadget that we are in L1 state */
+ call_gadget(hsotg, suspend);
+ }
+ }
+}
+
+#define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \
+ GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \
+ GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \
+ GINTSTS_USBSUSP | GINTSTS_PRTINT | \
+ GINTSTS_LPMTRANRCVD)
+
+/*
+ * This function returns the Core Interrupt register
+ */
+static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
+{
+ u32 gintsts;
+ u32 gintmsk;
+ u32 gahbcfg;
+ u32 gintmsk_common = GINTMSK_COMMON;
+
+ gintsts = dwc2_readl(hsotg, GINTSTS);
+ gintmsk = dwc2_readl(hsotg, GINTMSK);
+ gahbcfg = dwc2_readl(hsotg, GAHBCFG);
+
+ /* If any common interrupts set */
+ if (gintsts & gintmsk_common)
+ dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
+ gintsts, gintmsk);
+
+ if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
+ return gintsts & gintmsk & gintmsk_common;
+ else
+ return 0;
+}
+
+/**
+ * dwc_handle_gpwrdn_disc_det() - Handles the gpwrdn disconnect detect.
+ * Exits hibernation without restoring registers.
+ *
+ * @hsotg: Programming view of DWC_otg controller
+ * @gpwrdn: GPWRDN register
+ */
+static inline void dwc_handle_gpwrdn_disc_det(struct dwc2_hsotg *hsotg,
+ u32 gpwrdn)
+{
+ u32 gpwrdn_tmp;
+
+ /* Switch-on voltage to the core */
+ gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
+ gpwrdn_tmp &= ~GPWRDN_PWRDNSWTCH;
+ dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
+ udelay(5);
+
+ /* Reset core */
+ gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
+ gpwrdn_tmp &= ~GPWRDN_PWRDNRSTN;
+ dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
+ udelay(5);
+
+ /* Disable Power Down Clamp */
+ gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
+ gpwrdn_tmp &= ~GPWRDN_PWRDNCLMP;
+ dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
+ udelay(5);
+
+ /* Deassert reset core */
+ gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
+ gpwrdn_tmp |= GPWRDN_PWRDNRSTN;
+ dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
+ udelay(5);
+
+ /* Disable PMU interrupt */
+ gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
+ gpwrdn_tmp &= ~GPWRDN_PMUINTSEL;
+ dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
+
+ /* De-assert Wakeup Logic */
+ gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
+ gpwrdn_tmp &= ~GPWRDN_PMUACTV;
+ dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
+
+ hsotg->hibernated = 0;
+ hsotg->bus_suspended = 0;
+
+ if (gpwrdn & GPWRDN_IDSTS) {
+ hsotg->op_state = OTG_STATE_B_PERIPHERAL;
+ dwc2_core_init(hsotg, false);
+ dwc2_enable_global_interrupts(hsotg);
+ dwc2_hsotg_core_init_disconnected(hsotg, false);
+ dwc2_hsotg_core_connect(hsotg);
+ } else {
+ hsotg->op_state = OTG_STATE_A_HOST;
+
+ /* Initialize the Core for Host mode */
+ dwc2_core_init(hsotg, false);
+ dwc2_enable_global_interrupts(hsotg);
+ dwc2_hcd_start(hsotg);
+ }
+}
+
+/*
+ * GPWRDN interrupt handler.
+ *
+ * The GPWRDN interrupts are those that occur in both Host and
+ * Device mode while core is in hibernated state.
+ */
+static int dwc2_handle_gpwrdn_intr(struct dwc2_hsotg *hsotg)
+{
+ u32 gpwrdn;
+ int linestate;
+ int ret = 0;
+
+ gpwrdn = dwc2_readl(hsotg, GPWRDN);
+ /* clear all interrupt */
+ dwc2_writel(hsotg, gpwrdn, GPWRDN);
+ linestate = (gpwrdn & GPWRDN_LINESTATE_MASK) >> GPWRDN_LINESTATE_SHIFT;
+ dev_dbg(hsotg->dev,
+ "%s: dwc2_handle_gpwrdwn_intr called gpwrdn= %08x\n", __func__,
+ gpwrdn);
+
+ if ((gpwrdn & GPWRDN_DISCONN_DET) &&
+ (gpwrdn & GPWRDN_DISCONN_DET_MSK) && !linestate) {
+ dev_dbg(hsotg->dev, "%s: GPWRDN_DISCONN_DET\n", __func__);
+ /*
+ * Call disconnect detect function to exit from
+ * hibernation
+ */
+ dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
+ } else if ((gpwrdn & GPWRDN_LNSTSCHG) &&
+ (gpwrdn & GPWRDN_LNSTSCHG_MSK) && linestate) {
+ dev_dbg(hsotg->dev, "%s: GPWRDN_LNSTSCHG\n", __func__);
+ if (hsotg->hw_params.hibernation &&
+ hsotg->hibernated) {
+ if (gpwrdn & GPWRDN_IDSTS) {
+ ret = dwc2_exit_hibernation(hsotg, 0, 0, 0);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit hibernation failed.\n");
+ call_gadget(hsotg, resume);
+ } else {
+ ret = dwc2_exit_hibernation(hsotg, 1, 0, 1);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit hibernation failed.\n");
+ }
+ }
+ } else if ((gpwrdn & GPWRDN_RST_DET) &&
+ (gpwrdn & GPWRDN_RST_DET_MSK)) {
+ dev_dbg(hsotg->dev, "%s: GPWRDN_RST_DET\n", __func__);
+ if (!linestate) {
+ ret = dwc2_exit_hibernation(hsotg, 0, 1, 0);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit hibernation failed.\n");
+ }
+ } else if ((gpwrdn & GPWRDN_STS_CHGINT) &&
+ (gpwrdn & GPWRDN_STS_CHGINT_MSK)) {
+ dev_dbg(hsotg->dev, "%s: GPWRDN_STS_CHGINT\n", __func__);
+ /*
+ * As GPWRDN_STS_CHGINT exit from hibernation flow is
+ * the same as in GPWRDN_DISCONN_DET flow. Call
+ * disconnect detect helper function to exit from
+ * hibernation.
+ */
+ dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
+ }
+
+ return ret;
+}
+
+/*
+ * 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;
+ }
+
+ /* Reading current frame number value in device or host modes. */
+ if (dwc2_is_device_mode(hsotg))
+ hsotg->frame_number = (dwc2_readl(hsotg, DSTS)
+ & DSTS_SOFFN_MASK) >> DSTS_SOFFN_SHIFT;
+ else
+ hsotg->frame_number = (dwc2_readl(hsotg, HFNUM)
+ & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
+
+ gintsts = dwc2_read_common_intr(hsotg);
+ if (gintsts & ~GINTSTS_PRTINT)
+ retval = IRQ_HANDLED;
+
+ /* In case of hibernated state gintsts must not work */
+ if (hsotg->hibernated) {
+ dwc2_handle_gpwrdn_intr(hsotg);
+ retval = IRQ_HANDLED;
+ goto out;
+ }
+
+ 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_LPMTRANRCVD)
+ dwc2_handle_lpm_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;
+}