1
linux/drivers/usb/dwc2/core_intr.c

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// 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);
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
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;
u32 pcgctl;
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)) {
if (hsotg->params.eusb2_disc) {
/* Clear the Gate hclk. */
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl &= ~PCGCTL_GATEHCLK;
dwc2_writel(hsotg, pcgctl, PCGCTL);
udelay(5);
/* Clear Phy Clock bit. */
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl &= ~PCGCTL_STOPPCLK;
dwc2_writel(hsotg, pcgctl, PCGCTL);
udelay(5);
}
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_L3;
}
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)
{
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
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);
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
hsotg->lx_state);
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
if (dwc2_is_device_mode(hsotg)) {
if (hsotg->lx_state != DWC2_L0) {
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 &&
!hsotg->params.no_clock_gating)
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
*
*/
void dwc2_wakeup_from_lpm_l1(struct dwc2_hsotg *hsotg, bool remotewakeup)
{
u32 glpmcfg;
u32 pcgctl;
u32 dctl;
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, remotewakeup=%d\n", remotewakeup);
glpmcfg &= ~GLPMCFG_ENBLSLPM;
glpmcfg &= ~GLPMCFG_HIRD_THRES_MASK;
dwc2_writel(hsotg, glpmcfg, GLPMCFG);
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl &= ~PCGCTL_ENBL_SLEEP_GATING;
dwc2_writel(hsotg, pcgctl, PCGCTL);
glpmcfg = dwc2_readl(hsotg, GLPMCFG);
if (glpmcfg & GLPMCFG_ENBESL) {
glpmcfg |= GLPMCFG_RSTRSLPSTS;
dwc2_writel(hsotg, glpmcfg, GLPMCFG);
}
if (remotewakeup) {
if (dwc2_hsotg_wait_bit_set(hsotg, GLPMCFG, GLPMCFG_L1RESUMEOK, 1000)) {
dev_warn(hsotg->dev, "%s: timeout GLPMCFG_L1RESUMEOK\n", __func__);
goto fail;
return;
}
dctl = dwc2_readl(hsotg, DCTL);
dctl |= DCTL_RMTWKUPSIG;
dwc2_writel(hsotg, dctl, DCTL);
if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, GINTSTS_WKUPINT, 1000)) {
dev_warn(hsotg->dev, "%s: timeout GINTSTS_WKUPINT\n", __func__);
goto fail;
return;
}
}
glpmcfg = dwc2_readl(hsotg, GLPMCFG);
if (glpmcfg & GLPMCFG_COREL1RES_MASK || glpmcfg & GLPMCFG_SLPSTS ||
glpmcfg & GLPMCFG_L1RESUMEOK) {
goto fail;
return;
}
/* Inform gadget to exit from L1 */
call_gadget(hsotg, resume);
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
hsotg->bus_suspended = false;
fail: dwc2_gadget_init_lpm(hsotg);
} else {
/* TODO */
dev_err(hsotg->dev, "Host side LPM is not supported.\n");
return;
}
}
/*
* 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;
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
/* Clear interrupt */
dwc2_writel(hsotg, GINTSTS_WKUPINT, GINTSTS);
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
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, false);
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 &&
!hsotg->params.no_clock_gating)
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 &&
!hsotg->params.no_clock_gating)
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);
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
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;
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
/* Clear interrupt */
dwc2_writel(hsotg, GINTSTS_USBSUSP, GINTSTS);
usb: dwc2: host: Clear interrupts before handling them In general it is wise to clear interrupts before processing them. If you don't do that, you can get: 1. Interrupt happens 2. You look at system state and process interrupt 3. A new interrupt happens 4. You clear interrupt without processing it. This patch was actually a first attempt to fix missing device insertions as described in (usb: dwc2: host: Fix missing device insertions) and it did solve some of the signal bouncing problems but not all of them (which is why I submitted the other patch). Specifically, this patch itself would sometimes change: 1. hardware sees connect 2. hardware sees disconnect 3. hardware sees connect 4. dwc2_port_intr() - clears connect interrupt 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...to: 1. hardware sees connect 2. hardware sees disconnect 3. dwc2_port_intr() - clears connect interrupt 4. hardware sees connect 5. dwc2_handle_common_intr() - calls dwc2_hcd_disconnect() ...but with different timing then sometimes we'd still miss cable insertions. In any case, though this patch doesn't fix any (known) problems, it still seems wise as a general policy to clear interrupt before handling them. Note that for dwc2_handle_usb_port_intr(), instead of moving the clear of PRTINT to the beginning of the function we remove it completely. The only way to clear PRTINT is to clear the sources that set it in the first place. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-11-20 10:06:28 -07:00
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);
/* Reset ULPI latch */
gpwrdn = dwc2_readl(hsotg, GPWRDN);
gpwrdn &= ~GPWRDN_ULPI_LATCH_EN_DURING_HIB_ENTRY;
dwc2_writel(hsotg, gpwrdn, 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;
}