[linux-2.6-block.git] / drivers / usb / 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)
{
	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 = readl(hsotg->regs + HPRT0);

	if (hprt0 & HPRT0_ENACHG) {
		hprt0 &= ~HPRT0_ENA;
		writel(hprt0, hsotg->regs + HPRT0);
	}

	/* Clear interrupt */
	writel(GINTSTS_PRTINT, hsotg->regs + GINTSTS);
}

/**
 * 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->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 = 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->hw_params.power_optimized);
	} else {
		if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
			dev_dbg(hsotg->dev, "a_peripheral->a_host\n");

			/* Clear the a_peripheral flag, back to a_host */
			spin_unlock(&hsotg->lock);
			dwc2_hcd_start(hsotg);
			spin_lock(&hsotg->lock);
			hsotg->op_state = OTG_STATE_A_HOST;
		}
	}

	/* Change to L2 (suspend) state */
	hsotg->lx_state = DWC2_L2;

	/* Clear interrupt */
	writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS);
}

#define GINTMSK_COMMON	(GINTSTS_WKUPINT | GINTSTS_SESSREQINT |		\
			 GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT |	\
			 GINTSTS_MODEMIS | GINTSTS_DISCONNINT |		\
			 GINTSTS_USBSUSP | 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);

	/* 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;
}

/*
 * 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;

	if (!dwc2_is_controller_alive(hsotg)) {
		dev_warn(hsotg->dev, "Controller is dead\n");
		goto out;
	}

	spin_lock(&hsotg->lock);

	gintsts = dwc2_read_common_intr(hsotg);
	if (gintsts & ~GINTSTS_PRTINT)
		retval = IRQ_HANDLED;

	if (gintsts & GINTSTS_MODEMIS)
		dwc2_handle_mode_mismatch_intr(hsotg);
	if (gintsts & GINTSTS_OTGINT)
		dwc2_handle_otg_intr(hsotg);
	if (gintsts & GINTSTS_CONIDSTSCHNG)
		dwc2_handle_conn_id_status_change_intr(hsotg);
	if (gintsts & GINTSTS_DISCONNINT)
		dwc2_handle_disconnect_intr(hsotg);
	if (gintsts & GINTSTS_SESSREQINT)
		dwc2_handle_session_req_intr(hsotg);
	if (gintsts & GINTSTS_WKUPINT)
		dwc2_handle_wakeup_detected_intr(hsotg);
	if (gintsts & GINTSTS_USBSUSP)
		dwc2_handle_usb_suspend_intr(hsotg);

	if (gintsts & GINTSTS_PRTINT) {
		/*
		 * The port interrupt occurs while in device mode with HPRT0
		 * Port Enable/Disable
		 */
		if (dwc2_is_device_mode(hsotg)) {
			dev_dbg(hsotg->dev,
				" --Port interrupt received in Device mode--\n");
			dwc2_handle_usb_port_intr(hsotg);
			retval = IRQ_HANDLED;
		}
	}

	spin_unlock(&hsotg->lock);
out:
	return retval;
}
EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);
Commit	Line	Data
56f5b1cf PZ	1	/*
	2	* core_intr.c - DesignWare HS OTG Controller common interrupt handling
	3	*
	4	* Copyright (C) 2004-2013 Synopsys, Inc.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions, and the following disclaimer,
	11	* without modification.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. The names of the above-listed copyright holders may not be used
	16	* to endorse or promote products derived from this software without
	17	* specific prior written permission.
	18	*
	19	* ALTERNATIVELY, this software may be distributed under the terms of the
	20	* GNU General Public License ("GPL") as published by the Free Software
	21	* Foundation; either version 2 of the License, or (at your option) any
	22	* later version.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
	25	* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	26	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	27	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	28	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	29	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	30	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	31	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	32	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	33	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	34	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	/*
	38	* This file contains the common interrupt handlers
	39	*/
	40	#include <linux/kernel.h>
	41	#include <linux/module.h>
	42	#include <linux/moduleparam.h>
	43	#include <linux/spinlock.h>
	44	#include <linux/interrupt.h>
	45	#include <linux/dma-mapping.h>
	46	#include <linux/io.h>
	47	#include <linux/slab.h>
	48	#include <linux/usb.h>
	49
	50	#include <linux/usb/hcd.h>
	51	#include <linux/usb/ch11.h>
	52
	53	#include "core.h"
	54	#include "hcd.h"
	55
	56	static const char dwc2_op_state_str(struct dwc2_hsotg hsotg)
	57	{
56f5b1cf PZ	58	switch (hsotg->op_state) {
	59	case OTG_STATE_A_HOST:
	60	return "a_host";
	61	case OTG_STATE_A_SUSPEND:
	62	return "a_suspend";
	63	case OTG_STATE_A_PERIPHERAL:
	64	return "a_peripheral";
	65	case OTG_STATE_B_PERIPHERAL:
	66	return "b_peripheral";
	67	case OTG_STATE_B_HOST:
	68	return "b_host";
	69	default:
	70	return "unknown";
	71	}
56f5b1cf PZ	72	}
56f5b1cf PZ	73
93571adb DN	74	/**
	75	* dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
	76	* When the PRTINT interrupt fires, there are certain status bits in the Host
	77	* Port that needs to get cleared.
	78	*
	79	* @hsotg: Programming view of DWC_otg controller
	80	*/
	81	static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
	82	{
	83	u32 hprt0 = readl(hsotg->regs + HPRT0);
	84
	85	if (hprt0 & HPRT0_ENACHG) {
	86	hprt0 &= ~HPRT0_ENA;
	87	writel(hprt0, hsotg->regs + HPRT0);
	88	}
	89
	90	/* Clear interrupt */
	91	writel(GINTSTS_PRTINT, hsotg->regs + GINTSTS);
	92	}
	93
56f5b1cf PZ	94	/**
	95	* dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
	96	*
	97	* @hsotg: Programming view of DWC_otg controller
	98	*/
	99	static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
	100	{
	101	dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
	102	dwc2_is_host_mode(hsotg) ? "Host" : "Device");
	103
	104	/* Clear interrupt */
	105	writel(GINTSTS_MODEMIS, hsotg->regs + GINTSTS);
	106	}
	107
	108	/**
	109	* dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
	110	* Interrupt Register (GOTGINT) to determine what interrupt has occurred.
	111	*
	112	* @hsotg: Programming view of DWC_otg controller
	113	*/
	114	static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
	115	{
	116	u32 gotgint;
	117	u32 gotgctl;
	118	u32 gintmsk;
	119
	120	gotgint = readl(hsotg->regs + GOTGINT);
	121	gotgctl = readl(hsotg->regs + GOTGCTL);
	122	dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
	123	dwc2_op_state_str(hsotg));
	124
	125	if (gotgint & GOTGINT_SES_END_DET) {
	126	dev_dbg(hsotg->dev,
	127	" ++OTG Interrupt: Session End Detected++ (%s)\n",
	128	dwc2_op_state_str(hsotg));
	129	gotgctl = readl(hsotg->regs + GOTGCTL);
	130
	131	if (hsotg->op_state == OTG_STATE_B_HOST) {
	132	hsotg->op_state = OTG_STATE_B_PERIPHERAL;
	133	} else {
	134	/*
	135	* If not B_HOST and Device HNP still set, HNP did
	136	* not succeed!
	137	*/
	138	if (gotgctl & GOTGCTL_DEVHNPEN) {
	139	dev_dbg(hsotg->dev, "Session End Detected\n");
	140	dev_err(hsotg->dev,
	141	"Device Not Connected/Responding!\n");
	142	}
	143
	144	/*
	145	* If Session End Detected the B-Cable has been
	146	* disconnected
	147	*/
	148	/* Reset to a clean state */
	149	hsotg->lx_state = DWC2_L0;
	150	}
	151
	152	gotgctl = readl(hsotg->regs + GOTGCTL);
	153	gotgctl &= ~GOTGCTL_DEVHNPEN;
	154	writel(gotgctl, hsotg->regs + GOTGCTL);
	155	}
	156
	157	if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
158	dev_dbg(hsotg->dev,
159	" ++OTG Interrupt: Session Request Success Status Change++\n");
160	gotgctl = readl(hsotg->regs + GOTGCTL);
161	if (gotgctl & GOTGCTL_SESREQSCS) {
162	if (hsotg->core_params->phy_type ==
163	DWC2_PHY_TYPE_PARAM_FS
164	&& hsotg->core_params->i2c_enable > 0) {
165	hsotg->srp_success = 1;
166	} else {
167	/* Clear Session Request */
168	gotgctl = readl(hsotg->regs + GOTGCTL);
169	gotgctl &= ~GOTGCTL_SESREQ;
170	writel(gotgctl, hsotg->regs + GOTGCTL);
171	}
172	}
173	}
174
175	if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
176	/*
177	* Print statements during the HNP interrupt handling
178	* can cause it to fail
179	*/
180	gotgctl = readl(hsotg->regs + GOTGCTL);
181	/*
182	* WA for 3.00a- HW is not setting cur_mode, even sometimes
183	* this does not help
184	*/
9badec2f	185	if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
56f5b1cf PZ	186	udelay(100);
	187	if (gotgctl & GOTGCTL_HSTNEGSCS) {
	188	if (dwc2_is_host_mode(hsotg)) {
	189	hsotg->op_state = OTG_STATE_B_HOST;
	190	/*
	191	* Need to disable SOF interrupt immediately.
	192	* When switching from device to host, the PCD
	193	* interrupt handler won't handle the interrupt
	194	* if host mode is already set. The HCD
	195	* interrupt handler won't get called if the
	196	* HCD state is HALT. This means that the
	197	* interrupt does not get handled and Linux
	198	* complains loudly.
	199	*/
	200	gintmsk = readl(hsotg->regs + GINTMSK);
	201	gintmsk &= ~GINTSTS_SOF;
	202	writel(gintmsk, hsotg->regs + GINTMSK);
	203
	204	/*
	205	* Call callback function with spin lock
	206	* released
	207	*/
	208	spin_unlock(&hsotg->lock);
	209
	210	/* Initialize the Core for Host mode */
	211	dwc2_hcd_start(hsotg);
	212	spin_lock(&hsotg->lock);
	213	hsotg->op_state = OTG_STATE_B_HOST;
	214	}
	215	} else {
	216	gotgctl = readl(hsotg->regs + GOTGCTL);
	217	gotgctl &= ~(GOTGCTL_HNPREQ \| GOTGCTL_DEVHNPEN);
	218	writel(gotgctl, hsotg->regs + GOTGCTL);
	219	dev_dbg(hsotg->dev, "HNP Failed\n");
	220	dev_err(hsotg->dev,
	221	"Device Not Connected/Responding\n");
	222	}
	223	}
	224
	225	if (gotgint & GOTGINT_HST_NEG_DET) {
	226	/*
	227	* The disconnect interrupt is set at the same time as
	228	* Host Negotiation Detected. During the mode switch all
	229	* interrupts are cleared so the disconnect interrupt
	230	* handler will not get executed.
	231	*/
	232	dev_dbg(hsotg->dev,
	233	" ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
	234	(dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
	235	if (dwc2_is_device_mode(hsotg)) {
	236	dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
	237	hsotg->op_state);
	238	spin_unlock(&hsotg->lock);
	239	dwc2_hcd_disconnect(hsotg);
	240	spin_lock(&hsotg->lock);
	241	hsotg->op_state = OTG_STATE_A_PERIPHERAL;
	242	} else {
	243	/* Need to disable SOF interrupt immediately */
	244	gintmsk = readl(hsotg->regs + GINTMSK);
	245	gintmsk &= ~GINTSTS_SOF;
	246	writel(gintmsk, hsotg->regs + GINTMSK);
	247	spin_unlock(&hsotg->lock);
	248	dwc2_hcd_start(hsotg);
	249	spin_lock(&hsotg->lock);
250	hsotg->op_state = OTG_STATE_A_HOST;
251	}
252	}
253
254	if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
255	dev_dbg(hsotg->dev,
256	" ++OTG Interrupt: A-Device Timeout Change++\n");
257	if (gotgint & GOTGINT_DBNCE_DONE)
258	dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
259
260	/* Clear GOTGINT */
261	writel(gotgint, hsotg->regs + GOTGINT);
262	}
263
264	/**
265	* dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
266	* Change Interrupt
267	*
268	* @hsotg: Programming view of DWC_otg controller
269	*
270	* Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
271	* Device to Host Mode transition or a Host to Device Mode transition. This only
272	* occurs when the cable is connected/removed from the PHY connector.
273	*/
274	static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
275	{
276	u32 gintmsk = readl(hsotg->regs + GINTMSK);
277
278	/* Need to disable SOF interrupt immediately */
279	gintmsk &= ~GINTSTS_SOF;
280	writel(gintmsk, hsotg->regs + GINTMSK);
281
282	dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n",
283	dwc2_is_host_mode(hsotg) ? "Host" : "Device");
284
285	/*
286	* Need to schedule a work, as there are possible DELAY function calls.
287	* Release lock before scheduling workq as it holds spinlock during
288	* scheduling.
289	*/
290	spin_unlock(&hsotg->lock);
291	queue_work(hsotg->wq_otg, &hsotg->wf_otg);
292	spin_lock(&hsotg->lock);
293
294	/* Clear interrupt */
295	writel(GINTSTS_CONIDSTSCHNG, hsotg->regs + GINTSTS);
296	}
297
298	/**
299	* dwc2_handle_session_req_intr() - This interrupt indicates that a device is
300	* initiating the Session Request Protocol to request the host to turn on bus
301	* power so a new session can begin
302	*
303	* @hsotg: Programming view of DWC_otg controller
304	*
305	* This handler responds by turning on bus power. If the DWC_otg controller is
306	* in low power mode, this handler brings the controller out of low power mode
307	* before turning on bus power.
308	*/
309	static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
310	{
311	dev_dbg(hsotg->dev, "++Session Request Interrupt++\n");
312
313	/* Clear interrupt */
314	writel(GINTSTS_SESSREQINT, hsotg->regs + GINTSTS);
315	}
316
317	/*
318	* This interrupt indicates that the DWC_otg controller has detected a
319	* resume or remote wakeup sequence. If the DWC_otg controller is in
320	* low power mode, the handler must brings the controller out of low
321	* power mode. The controller automatically begins resume signaling.
322	* The handler schedules a time to stop resume signaling.
323	*/
324	static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
325	{
326	dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
327	dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
328
329	if (dwc2_is_device_mode(hsotg)) {
330	dev_dbg(hsotg->dev, "DSTS=0x%0x\n", readl(hsotg->regs + DSTS));
331	if (hsotg->lx_state == DWC2_L2) {
332	u32 dctl = readl(hsotg->regs + DCTL);
333
334	/* Clear Remote Wakeup Signaling */
335	dctl &= ~DCTL_RMTWKUPSIG;
336	writel(dctl, hsotg->regs + DCTL);
337	}
338	/* Change to L0 state */
339	hsotg->lx_state = DWC2_L0;
340	} else {
341	if (hsotg->lx_state != DWC2_L1) {
342	u32 pcgcctl = readl(hsotg->regs + PCGCTL);
343
344	/* Restart the Phy Clock */
345	pcgcctl &= ~PCGCTL_STOPPCLK;
346	writel(pcgcctl, hsotg->regs + PCGCTL);
347	mod_timer(&hsotg->wkp_timer,
348	jiffies + msecs_to_jiffies(71));
349	} else {
350	/* Change to L0 state */
351	hsotg->lx_state = DWC2_L0;
352	}
353	}
354
355	/* Clear interrupt */
356	writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS);
357	}
358
359	/*
360	* This interrupt indicates that a device has been disconnected from the
361	* root port
362	*/
363	static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
364	{
365	dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
366	dwc2_is_host_mode(hsotg) ? "Host" : "Device",
367	dwc2_op_state_str(hsotg));
368
369	/* Change to L3 (OFF) state */
370	hsotg->lx_state = DWC2_L3;
371
372	writel(GINTSTS_DISCONNINT, hsotg->regs + GINTSTS);
373	}
374
375	/*
376	* This interrupt indicates that SUSPEND state has been detected on the USB.
377	*
378	* For HNP the USB Suspend interrupt signals the change from "a_peripheral"
379	* to "a_host".
380	*
381	* When power management is enabled the core will be put in low power mode.
382	*/
383	static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
384	{
385	u32 dsts;
386
387	dev_dbg(hsotg->dev, "USB SUSPEND\n");
388
389	if (dwc2_is_device_mode(hsotg)) {
390	/*
391	* Check the Device status register to determine if the Suspend
392	* state is active
393	*/
394	dsts = readl(hsotg->regs + DSTS);
395	dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts);
396	dev_dbg(hsotg->dev,
397	"DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",
398	!!(dsts & DSTS_SUSPSTS),
9badec2f	399	hsotg->hw_params.power_optimized);
56f5b1cf PZ	400	} else {
	401	if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
	402	dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
	403
	404	/* Clear the a_peripheral flag, back to a_host */
	405	spin_unlock(&hsotg->lock);
	406	dwc2_hcd_start(hsotg);
	407	spin_lock(&hsotg->lock);
	408	hsotg->op_state = OTG_STATE_A_HOST;
	409	}
	410	}
	411
	412	/* Change to L2 (suspend) state */
	413	hsotg->lx_state = DWC2_L2;
	414
	415	/* Clear interrupt */
	416	writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS);
	417	}
	418
	419	#define GINTMSK_COMMON (GINTSTS_WKUPINT \| GINTSTS_SESSREQINT \| \
	420	GINTSTS_CONIDSTSCHNG \| GINTSTS_OTGINT \| \
	421	GINTSTS_MODEMIS \| GINTSTS_DISCONNINT \| \
438492ab	422	GINTSTS_USBSUSP \| GINTSTS_PRTINT)
56f5b1cf PZ	423
	424	/*
	425	* This function returns the Core Interrupt register
	426	*/
	427	static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
	428	{
	429	u32 gintsts;
	430	u32 gintmsk;
	431	u32 gahbcfg;
	432	u32 gintmsk_common = GINTMSK_COMMON;
	433
	434	gintsts = readl(hsotg->regs + GINTSTS);
	435	gintmsk = readl(hsotg->regs + GINTMSK);
	436	gahbcfg = readl(hsotg->regs + GAHBCFG);
	437
56f5b1cf PZ	438	/* If any common interrupts set */
	439	if (gintsts & gintmsk_common)
	440	dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
	441	gintsts, gintmsk);
56f5b1cf PZ	442
	443	if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
	444	return gintsts & gintmsk & gintmsk_common;
	445	else
	446	return 0;
	447	}
	448
	449	/*
	450	* Common interrupt handler
	451	*
	452	* The common interrupts are those that occur in both Host and Device mode.
	453	* This handler handles the following interrupts:
	454	* - Mode Mismatch Interrupt
	455	* - OTG Interrupt
	456	* - Connector ID Status Change Interrupt
	457	* - Disconnect Interrupt
	458	* - Session Request Interrupt
	459	* - Resume / Remote Wakeup Detected Interrupt
	460	* - Suspend Interrupt
	461	*/
	462	irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
	463	{
	464	struct dwc2_hsotg *hsotg = dev;
	465	u32 gintsts;
6aafb003	466	irqreturn_t retval = IRQ_NONE;
56f5b1cf	467
057715f2 PZ	468	if (!dwc2_is_controller_alive(hsotg)) {
057715f2 PZ	469	dev_warn(hsotg->dev, "Controller is dead\n");
56f5b1cf PZ	470	goto out;
	471	}
	472
	473	spin_lock(&hsotg->lock);
	474
	475	gintsts = dwc2_read_common_intr(hsotg);
	476	if (gintsts & ~GINTSTS_PRTINT)
6aafb003	477	retval = IRQ_HANDLED;
56f5b1cf PZ	478
	479	if (gintsts & GINTSTS_MODEMIS)
	480	dwc2_handle_mode_mismatch_intr(hsotg);
	481	if (gintsts & GINTSTS_OTGINT)
	482	dwc2_handle_otg_intr(hsotg);
	483	if (gintsts & GINTSTS_CONIDSTSCHNG)
	484	dwc2_handle_conn_id_status_change_intr(hsotg);
	485	if (gintsts & GINTSTS_DISCONNINT)
	486	dwc2_handle_disconnect_intr(hsotg);
	487	if (gintsts & GINTSTS_SESSREQINT)
	488	dwc2_handle_session_req_intr(hsotg);
	489	if (gintsts & GINTSTS_WKUPINT)
	490	dwc2_handle_wakeup_detected_intr(hsotg);
	491	if (gintsts & GINTSTS_USBSUSP)
	492	dwc2_handle_usb_suspend_intr(hsotg);
	493
56f5b1cf PZ	494	if (gintsts & GINTSTS_PRTINT) {
	495	/*
	496	* The port interrupt occurs while in device mode with HPRT0
	497	* Port Enable/Disable
	498	*/
	499	if (dwc2_is_device_mode(hsotg)) {
	500	dev_dbg(hsotg->dev,
	501	" --Port interrupt received in Device mode--\n");
93571adb DN	502	dwc2_handle_usb_port_intr(hsotg);
93571adb DN	503	retval = IRQ_HANDLED;
56f5b1cf PZ	504	}
	505	}
	506
	507	spin_unlock(&hsotg->lock);
	508	out:
6aafb003	509	return retval;
56f5b1cf PZ	510	}
56f5b1cf PZ	511	EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);