- 根目录:
- drivers
- staging
- dwc2
- core_intr.c
/*
* core_intr.c - DesignWare HS OTG Controller common interrupt handling
*
* Copyright (C) 2004-2013 Synopsys, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS 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.
*/
/*
* 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)
{
#ifdef DEBUG
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";
}
#else
return "";
#endif
}
/**
* 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)
{
dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Device");
/* Clear interrupt */
writel(GINTSTS_MODEMIS, hsotg->regs + GINTSTS);
}
/**
* 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 = readl(hsotg->regs + GOTGINT);
gotgctl = readl(hsotg->regs + 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 = readl(hsotg->regs + GOTGCTL);
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 = readl(hsotg->regs + GOTGCTL);
gotgctl &= ~GOTGCTL_DEVHNPEN;
writel(gotgctl, hsotg->regs + GOTGCTL);
}
if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
dev_dbg(hsotg->dev,
" ++OTG Interrupt: Session Request Success Status Change++\n");
gotgctl = readl(hsotg->regs + 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 = readl(hsotg->regs + GOTGCTL);
gotgctl &= ~GOTGCTL_SESREQ;
writel(gotgctl, hsotg->regs + GOTGCTL);
}
}
}
if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
/*
* Print statements during the HNP interrupt handling
* can cause it to fail
*/
gotgctl = readl(hsotg->regs + GOTGCTL);
/*
* WA for 3.00a- HW is not setting cur_mode, even sometimes
* this does not help
*/
if (hsotg->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 = readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_SOF;
writel(gintmsk, hsotg->regs + 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 = readl(hsotg->regs + GOTGCTL);
gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
writel(gotgctl, hsotg->regs + 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 = readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_SOF;
writel(gintmsk, hsotg->regs + 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 */
writel(gotgint, hsotg->regs + 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 = readl(hsotg->regs + GINTMSK);
/* Need to disable SOF interrupt immediately */
gintmsk &= ~GINTSTS_SOF;
writel(gintmsk, hsotg->regs + 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.
* Release lock before scheduling workq as it holds spinlock during
* scheduling.
*/
spin_unlock(&hsotg->lock);
queue_work(hsotg->wq_otg, &hsotg->wf_otg);
spin_lock(&hsotg->lock);
/* Clear interrupt */
writel(GINTSTS_CONIDSTSCHNG, hsotg->regs + GINTSTS);
}
/**
* 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 */
writel(GINTSTS_SESSREQINT, 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);
}
/*
* This interrupt indicates that a device has been disconnected from the
* root port
*/
static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
{
dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Device",
dwc2_op_state_str(hsotg));
/* Change to L3 (OFF) state */
hsotg->lx_state = DWC2_L3;
writel(GINTSTS_DISCONNINT, hsotg->regs + GINTSTS);
}
/*
* 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->hwcfg4 & GHWCFG4_POWER_OPTIMIZ));
} 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);
}
#define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \
GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \
GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \
GINTSTS_USBSUSP | GINTSTS_RESTOREDONE | \
GINTSTS_PRTINT)
/*
* 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 = readl(hsotg->regs + GINTSTS);
gintmsk = readl(hsotg->regs + GINTMSK);
gahbcfg = readl(hsotg->regs + GAHBCFG);
#ifdef DEBUG
/* If any common interrupts set */
if (gintsts & gintmsk_common)
dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
gintsts, gintmsk);
#endif
if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
return gintsts & gintmsk & gintmsk_common;
else
return 0;
}
/*
* 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;
int retval = 0;
if (dwc2_check_core_status(hsotg) < 0) {
dev_warn(hsotg->dev, "Controller is disconnected\n");
goto out;
}
spin_lock(&hsotg->lock);
gintsts = dwc2_read_common_intr(hsotg);
if (gintsts & ~GINTSTS_PRTINT)
retval = 1;
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_RESTOREDONE) {
gintsts = GINTSTS_RESTOREDONE;
writel(gintsts, hsotg->regs + GINTSTS);
dev_dbg(hsotg->dev, " --Restore done interrupt received--\n");
}
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");
gintsts = GINTSTS_PRTINT;
writel(gintsts, hsotg->regs + GINTSTS);
retval = 1;
}
}
spin_unlock(&hsotg->lock);
out:
return IRQ_RETVAL(retval);
}
EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);