drivers/net/wireless/ath/wil6210/interrupt.c - nest-cam/v366/kernel_backports - Git at Google

 /*
  * Copyright (c) 2012 Qualcomm Atheros, Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include <linux/interrupt.h>

 #include "wil6210.h"
 #include "trace.h"

 /**
  * Theory of operation:
  *
  * There is ISR pseudo-cause register,
  * dma_rgf->DMA_RGF.PSEUDO_CAUSE.PSEUDO_CAUSE
  * Its bits represents OR'ed bits from 3 real ISR registers:
  * TX, RX, and MISC.
  *
  * Registers may be configured to either "write 1 to clear" or
  * "clear on read" mode
  *
  * When handling interrupt, one have to mask/unmask interrupts for the
  * real ISR registers, or hardware may malfunction.
  *
  */

 #define WIL6210_IRQ_DISABLE	(0xFFFFFFFFUL)
 #define WIL6210_IMC_RX		BIT_DMA_EP_RX_ICR_RX_DONE
 #define WIL6210_IMC_TX		(BIT_DMA_EP_TX_ICR_TX_DONE | \
 				BIT_DMA_EP_TX_ICR_TX_DONE_N(0))
 #define WIL6210_IMC_MISC	(ISR_MISC_FW_READY | \
 				 ISR_MISC_MBOX_EVT | \
 				 ISR_MISC_FW_ERROR)

 #define WIL6210_IRQ_PSEUDO_MASK (u32)(~(BIT_DMA_PSEUDO_CAUSE_RX | \
 					BIT_DMA_PSEUDO_CAUSE_TX | \
 					BIT_DMA_PSEUDO_CAUSE_MISC))

 #if defined(CPTCFG_WIL6210_ISR_COR)
 /* configure to Clear-On-Read mode */
 #define WIL_ICR_ICC_VALUE	(0xFFFFFFFFUL)

 static inline void wil_icr_clear(u32 x, void __iomem *addr)
 {
 }
 #else /* defined(CPTCFG_WIL6210_ISR_COR) */
 /* configure to Write-1-to-Clear mode */
 #define WIL_ICR_ICC_VALUE	(0UL)

 static inline void wil_icr_clear(u32 x, void __iomem *addr)
 {
 	iowrite32(x, addr);
 }
 #endif /* defined(CPTCFG_WIL6210_ISR_COR) */

 static inline u32 wil_ioread32_and_clear(void __iomem *addr)
 {
 	u32 x = ioread32(addr);

 	wil_icr_clear(x, addr);

 	return x;
 }

 static void wil6210_mask_irq_tx(struct wil6210_priv *wil)
 {
 	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
 		  HOSTADDR(RGF_DMA_EP_TX_ICR) +
 		  offsetof(struct RGF_ICR, IMS));
 }

 static void wil6210_mask_irq_rx(struct wil6210_priv *wil)
 {
 	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
 		  HOSTADDR(RGF_DMA_EP_RX_ICR) +
 		  offsetof(struct RGF_ICR, IMS));
 }

 static void wil6210_mask_irq_misc(struct wil6210_priv *wil)
 {
 	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
 		  HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 		  offsetof(struct RGF_ICR, IMS));
 }

 static void wil6210_mask_irq_pseudo(struct wil6210_priv *wil)
 {
 	wil_dbg_irq(wil, "%s()\n", __func__);

 	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
 		  HOSTADDR(RGF_DMA_PSEUDO_CAUSE_MASK_SW));

 	clear_bit(wil_status_irqen, &wil->status);
 }

 void wil6210_unmask_irq_tx(struct wil6210_priv *wil)
 {
 	iowrite32(WIL6210_IMC_TX, wil->csr +
 		  HOSTADDR(RGF_DMA_EP_TX_ICR) +
 		  offsetof(struct RGF_ICR, IMC));
 }

 void wil6210_unmask_irq_rx(struct wil6210_priv *wil)
 {
 	iowrite32(WIL6210_IMC_RX, wil->csr +
 		  HOSTADDR(RGF_DMA_EP_RX_ICR) +
 		  offsetof(struct RGF_ICR, IMC));
 }

 static void wil6210_unmask_irq_misc(struct wil6210_priv *wil)
 {
 	iowrite32(WIL6210_IMC_MISC, wil->csr +
 		  HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 		  offsetof(struct RGF_ICR, IMC));
 }

 static void wil6210_unmask_irq_pseudo(struct wil6210_priv *wil)
 {
 	wil_dbg_irq(wil, "%s()\n", __func__);

 	set_bit(wil_status_irqen, &wil->status);

 	iowrite32(WIL6210_IRQ_PSEUDO_MASK, wil->csr +
 		  HOSTADDR(RGF_DMA_PSEUDO_CAUSE_MASK_SW));
 }

 void wil6210_disable_irq(struct wil6210_priv *wil)
 {
 	wil_dbg_irq(wil, "%s()\n", __func__);

 	wil6210_mask_irq_tx(wil);
 	wil6210_mask_irq_rx(wil);
 	wil6210_mask_irq_misc(wil);
 	wil6210_mask_irq_pseudo(wil);
 }

 void wil6210_enable_irq(struct wil6210_priv *wil)
 {
 	wil_dbg_irq(wil, "%s()\n", __func__);

 	iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_RX_ICR) +
 		  offsetof(struct RGF_ICR, ICC));
 	iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_TX_ICR) +
 		  offsetof(struct RGF_ICR, ICC));
 	iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 		  offsetof(struct RGF_ICR, ICC));

 	/* interrupt moderation parameters */
 	if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 		/* disable interrupt moderation for monitor
 		 * to get better timestamp precision
 		 */
 		iowrite32(0, wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_CRL));
 	} else {
 		iowrite32(WIL6210_ITR_TRSH,
 			  wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_TRSH));
 		iowrite32(BIT_DMA_ITR_CNT_CRL_EN,
 			  wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_CRL));
 	}

 	wil6210_unmask_irq_pseudo(wil);
 	wil6210_unmask_irq_tx(wil);
 	wil6210_unmask_irq_rx(wil);
 	wil6210_unmask_irq_misc(wil);
 }

 static irqreturn_t wil6210_irq_rx(int irq, void *cookie)
 {
 	struct wil6210_priv *wil = cookie;
 	u32 isr = wil_ioread32_and_clear(wil->csr +
 					 HOSTADDR(RGF_DMA_EP_RX_ICR) +
 					 offsetof(struct RGF_ICR, ICR));

 	trace_wil6210_irq_rx(isr);
 	wil_dbg_irq(wil, "ISR RX 0x%08x\n", isr);

 	if (!isr) {
 		wil_err(wil, "spurious IRQ: RX\n");
 		return IRQ_NONE;
 	}

 	wil6210_mask_irq_rx(wil);

 	if (isr & BIT_DMA_EP_RX_ICR_RX_DONE) {
 		wil_dbg_irq(wil, "RX done\n");
 		isr &= ~BIT_DMA_EP_RX_ICR_RX_DONE;
 		wil_dbg_txrx(wil, "NAPI schedule\n");
 		napi_schedule(&wil->napi_rx);
 	}

 	if (isr)
 		wil_err(wil, "un-handled RX ISR bits 0x%08x\n", isr);

 	/* Rx IRQ will be enabled when NAPI processing finished */

 	return IRQ_HANDLED;
 }

 static irqreturn_t wil6210_irq_tx(int irq, void *cookie)
 {
 	struct wil6210_priv *wil = cookie;
 	u32 isr = wil_ioread32_and_clear(wil->csr +
 					 HOSTADDR(RGF_DMA_EP_TX_ICR) +
 					 offsetof(struct RGF_ICR, ICR));

 	trace_wil6210_irq_tx(isr);
 	wil_dbg_irq(wil, "ISR TX 0x%08x\n", isr);

 	if (!isr) {
 		wil_err(wil, "spurious IRQ: TX\n");
 		return IRQ_NONE;
 	}

 	wil6210_mask_irq_tx(wil);

 	if (isr & BIT_DMA_EP_TX_ICR_TX_DONE) {
 		wil_dbg_irq(wil, "TX done\n");
 		napi_schedule(&wil->napi_tx);
 		isr &= ~BIT_DMA_EP_TX_ICR_TX_DONE;
 		/* clear also all VRING interrupts */
 		isr &= ~(BIT(25) - 1UL);
 	}

 	if (isr)
 		wil_err(wil, "un-handled TX ISR bits 0x%08x\n", isr);

 	/* Tx IRQ will be enabled when NAPI processing finished */

 	return IRQ_HANDLED;
 }

 static void wil_notify_fw_error(struct wil6210_priv *wil)
 {
 	struct device *dev = &wil_to_ndev(wil)->dev;
 	char *envp[3] = {
 		[0] = "SOURCE=wil6210",
 		[1] = "EVENT=FW_ERROR",
 		[2] = NULL,
 	};
 	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 }

 static void wil_cache_mbox_regs(struct wil6210_priv *wil)
 {
 	/* make shadow copy of registers that should not change on run time */
 	wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
 			     sizeof(struct wil6210_mbox_ctl));
 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 }

 static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
 {
 	struct wil6210_priv *wil = cookie;
 	u32 isr = wil_ioread32_and_clear(wil->csr +
 					 HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 					 offsetof(struct RGF_ICR, ICR));

 	trace_wil6210_irq_misc(isr);
 	wil_dbg_irq(wil, "ISR MISC 0x%08x\n", isr);

 	if (!isr) {
 		wil_err(wil, "spurious IRQ: MISC\n");
 		return IRQ_NONE;
 	}

 	wil6210_mask_irq_misc(wil);

 	if (isr & ISR_MISC_FW_ERROR) {
 		wil_err(wil, "Firmware error detected\n");
 		clear_bit(wil_status_fwready, &wil->status);
 		/*
 		 * do not clear @isr here - we do 2-nd part in thread
 		 * there, user space get notified, and it should be done
 		 * in non-atomic context
 		 */
 	}

 	if (isr & ISR_MISC_FW_READY) {
 		wil_dbg_irq(wil, "IRQ: FW ready\n");
 		wil_cache_mbox_regs(wil);
 		set_bit(wil_status_reset_done, &wil->status);
 		/**
 		 * Actual FW ready indicated by the
 		 * WMI_FW_READY_EVENTID
 		 */
 		isr &= ~ISR_MISC_FW_READY;
 	}

 	wil->isr_misc = isr;

 	if (isr) {
 		return IRQ_WAKE_THREAD;
 	} else {
 		wil6210_unmask_irq_misc(wil);
 		return IRQ_HANDLED;
 	}
 }

 static irqreturn_t wil6210_irq_misc_thread(int irq, void *cookie)
 {
 	struct wil6210_priv *wil = cookie;
 	u32 isr = wil->isr_misc;

 	trace_wil6210_irq_misc_thread(isr);
 	wil_dbg_irq(wil, "Thread ISR MISC 0x%08x\n", isr);

 	if (isr & ISR_MISC_FW_ERROR) {
 		wil_notify_fw_error(wil);
 		isr &= ~ISR_MISC_FW_ERROR;
 	}

 	if (isr & ISR_MISC_MBOX_EVT) {
 		wil_dbg_irq(wil, "MBOX event\n");
 		wmi_recv_cmd(wil);
 		isr &= ~ISR_MISC_MBOX_EVT;
 	}

 	if (isr)
 		wil_err(wil, "un-handled MISC ISR bits 0x%08x\n", isr);

 	wil->isr_misc = 0;

 	wil6210_unmask_irq_misc(wil);

 	return IRQ_HANDLED;
 }

 /**
  * thread IRQ handler
  */
 static irqreturn_t wil6210_thread_irq(int irq, void *cookie)
 {
 	struct wil6210_priv *wil = cookie;

 	wil_dbg_irq(wil, "Thread IRQ\n");
 	/* Discover real IRQ cause */
 	if (wil->isr_misc)
 		wil6210_irq_misc_thread(irq, cookie);

 	wil6210_unmask_irq_pseudo(wil);

 	return IRQ_HANDLED;
 }

 /* DEBUG
  * There is subtle bug in hardware that causes IRQ to raise when it should be
  * masked. It is quite rare and hard to debug.
  *
  * Catch irq issue if it happens and print all I can.
  */
 static int wil6210_debug_irq_mask(struct wil6210_priv *wil, u32 pseudo_cause)
 {
 	if (!test_bit(wil_status_irqen, &wil->status)) {
 		u32 icm_rx = wil_ioread32_and_clear(wil->csr +
 				HOSTADDR(RGF_DMA_EP_RX_ICR) +
 				offsetof(struct RGF_ICR, ICM));
 		u32 icr_rx = wil_ioread32_and_clear(wil->csr +
 				HOSTADDR(RGF_DMA_EP_RX_ICR) +
 				offsetof(struct RGF_ICR, ICR));
 		u32 imv_rx = ioread32(wil->csr +
 				HOSTADDR(RGF_DMA_EP_RX_ICR) +
 				offsetof(struct RGF_ICR, IMV));
 		u32 icm_tx = wil_ioread32_and_clear(wil->csr +
 				HOSTADDR(RGF_DMA_EP_TX_ICR) +
 				offsetof(struct RGF_ICR, ICM));
 		u32 icr_tx = wil_ioread32_and_clear(wil->csr +
 				HOSTADDR(RGF_DMA_EP_TX_ICR) +
 				offsetof(struct RGF_ICR, ICR));
 		u32 imv_tx = ioread32(wil->csr +
 				HOSTADDR(RGF_DMA_EP_TX_ICR) +
 				offsetof(struct RGF_ICR, IMV));
 		u32 icm_misc = wil_ioread32_and_clear(wil->csr +
 				HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 				offsetof(struct RGF_ICR, ICM));
 		u32 icr_misc = wil_ioread32_and_clear(wil->csr +
 				HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 				offsetof(struct RGF_ICR, ICR));
 		u32 imv_misc = ioread32(wil->csr +
 				HOSTADDR(RGF_DMA_EP_MISC_ICR) +
 				offsetof(struct RGF_ICR, IMV));
 		wil_err(wil, "IRQ when it should be masked: pseudo 0x%08x\n"
 				"Rx   icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
 				"Tx   icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
 				"Misc icm:icr:imv 0x%08x 0x%08x 0x%08x\n",
 				pseudo_cause,
 				icm_rx, icr_rx, imv_rx,
 				icm_tx, icr_tx, imv_tx,
 				icm_misc, icr_misc, imv_misc);

 		return -EINVAL;
 	}

 	return 0;
 }

 static irqreturn_t wil6210_hardirq(int irq, void *cookie)
 {
 	irqreturn_t rc = IRQ_HANDLED;
 	struct wil6210_priv *wil = cookie;
 	u32 pseudo_cause = ioread32(wil->csr + HOSTADDR(RGF_DMA_PSEUDO_CAUSE));

 	/**
 	 * pseudo_cause is Clear-On-Read, no need to ACK
 	 */
 	if ((pseudo_cause == 0) || ((pseudo_cause & 0xff) == 0xff))
 		return IRQ_NONE;

 	/* FIXME: IRQ mask debug */
 	if (wil6210_debug_irq_mask(wil, pseudo_cause))
 		return IRQ_NONE;

 	trace_wil6210_irq_pseudo(pseudo_cause);
 	wil_dbg_irq(wil, "Pseudo IRQ 0x%08x\n", pseudo_cause);

 	wil6210_mask_irq_pseudo(wil);

 	/* Discover real IRQ cause
 	 * There are 2 possible phases for every IRQ:
 	 * - hard IRQ handler called right here
 	 * - threaded handler called later
 	 *
 	 * Hard IRQ handler reads and clears ISR.
 	 *
 	 * If threaded handler requested, hard IRQ handler
 	 * returns IRQ_WAKE_THREAD and saves ISR register value
 	 * for the threaded handler use.
 	 *
 	 * voting for wake thread - need at least 1 vote
 	 */
 	if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_RX) &&
 	    (wil6210_irq_rx(irq, cookie) == IRQ_WAKE_THREAD))
 		rc = IRQ_WAKE_THREAD;

 	if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_TX) &&
 	    (wil6210_irq_tx(irq, cookie) == IRQ_WAKE_THREAD))
 		rc = IRQ_WAKE_THREAD;

 	if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_MISC) &&
 	    (wil6210_irq_misc(irq, cookie) == IRQ_WAKE_THREAD))
 		rc = IRQ_WAKE_THREAD;

 	/* if thread is requested, it will unmask IRQ */
 	if (rc != IRQ_WAKE_THREAD)
 		wil6210_unmask_irq_pseudo(wil);

 	return rc;
 }

 static int wil6210_request_3msi(struct wil6210_priv *wil, int irq)
 {
 	int rc;
 	/*
 	 * IRQ's are in the following order:
 	 * - Tx
 	 * - Rx
 	 * - Misc
 	 */

 	rc = request_irq(irq, wil6210_irq_tx, IRQF_SHARED,
 			 WIL_NAME"_tx", wil);
 	if (rc)
 		return rc;

 	rc = request_irq(irq + 1, wil6210_irq_rx, IRQF_SHARED,
 			 WIL_NAME"_rx", wil);
 	if (rc)
 		goto free0;

 	rc = request_threaded_irq(irq + 2, wil6210_irq_misc,
 				  wil6210_irq_misc_thread,
 				  IRQF_SHARED, WIL_NAME"_misc", wil);
 	if (rc)
 		goto free1;

 	return 0;
 	/* error branch */
 free1:
 	free_irq(irq + 1, wil);
 free0:
 	free_irq(irq, wil);

 	return rc;
 }

 int wil6210_init_irq(struct wil6210_priv *wil, int irq)
 {
 	int rc;
 	if (wil->n_msi == 3)
 		rc = wil6210_request_3msi(wil, irq);
 	else
 		rc = request_threaded_irq(irq, wil6210_hardirq,
 					  wil6210_thread_irq,
 					  wil->n_msi ? 0 : IRQF_SHARED,
 					  WIL_NAME, wil);
 	if (rc)
 		return rc;

 	wil6210_enable_irq(wil);

 	return 0;
 }

 void wil6210_fini_irq(struct wil6210_priv *wil, int irq)
 {
 	wil6210_disable_irq(wil);
 	free_irq(irq, wil);
 	if (wil->n_msi == 3) {
 		free_irq(irq + 1, wil);
 		free_irq(irq + 2, wil);
 	}
 }
	/*
	* Copyright (c) 2012 Qualcomm Atheros, Inc.
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include <linux/interrupt.h>

	#include "wil6210.h"
	#include "trace.h"

	/**
	* Theory of operation:
	*
	* There is ISR pseudo-cause register,
	* dma_rgf->DMA_RGF.PSEUDO_CAUSE.PSEUDO_CAUSE
	* Its bits represents OR'ed bits from 3 real ISR registers:
	* TX, RX, and MISC.
	*
	* Registers may be configured to either "write 1 to clear" or
	* "clear on read" mode
	*
	* When handling interrupt, one have to mask/unmask interrupts for the
	* real ISR registers, or hardware may malfunction.
	*
	*/

	#define WIL6210_IRQ_DISABLE (0xFFFFFFFFUL)
	#define WIL6210_IMC_RX BIT_DMA_EP_RX_ICR_RX_DONE
	#define WIL6210_IMC_TX (BIT_DMA_EP_TX_ICR_TX_DONE \| \
	BIT_DMA_EP_TX_ICR_TX_DONE_N(0))
	#define WIL6210_IMC_MISC (ISR_MISC_FW_READY \| \
	ISR_MISC_MBOX_EVT \| \
	ISR_MISC_FW_ERROR)

	#define WIL6210_IRQ_PSEUDO_MASK (u32)(~(BIT_DMA_PSEUDO_CAUSE_RX \| \
	BIT_DMA_PSEUDO_CAUSE_TX \| \
	BIT_DMA_PSEUDO_CAUSE_MISC))

	#if defined(CPTCFG_WIL6210_ISR_COR)
	/* configure to Clear-On-Read mode */
	#define WIL_ICR_ICC_VALUE (0xFFFFFFFFUL)

	static inline void wil_icr_clear(u32 x, void __iomem *addr)
	{
	}
	#else /* defined(CPTCFG_WIL6210_ISR_COR) */
	/* configure to Write-1-to-Clear mode */
	#define WIL_ICR_ICC_VALUE (0UL)

	static inline void wil_icr_clear(u32 x, void __iomem *addr)
	{
	iowrite32(x, addr);
	}
	#endif /* defined(CPTCFG_WIL6210_ISR_COR) */

	static inline u32 wil_ioread32_and_clear(void __iomem *addr)
	{
	u32 x = ioread32(addr);

	wil_icr_clear(x, addr);

	return x;
	}

	static void wil6210_mask_irq_tx(struct wil6210_priv *wil)
	{
	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
	HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, IMS));
	}

	static void wil6210_mask_irq_rx(struct wil6210_priv *wil)
	{
	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
	HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, IMS));
	}

	static void wil6210_mask_irq_misc(struct wil6210_priv *wil)
	{
	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
	HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, IMS));
	}

	static void wil6210_mask_irq_pseudo(struct wil6210_priv *wil)
	{
	wil_dbg_irq(wil, "%s()\n", __func__);

	iowrite32(WIL6210_IRQ_DISABLE, wil->csr +
	HOSTADDR(RGF_DMA_PSEUDO_CAUSE_MASK_SW));

	clear_bit(wil_status_irqen, &wil->status);
	}

	void wil6210_unmask_irq_tx(struct wil6210_priv *wil)
	{
	iowrite32(WIL6210_IMC_TX, wil->csr +
	HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, IMC));
	}

	void wil6210_unmask_irq_rx(struct wil6210_priv *wil)
	{
	iowrite32(WIL6210_IMC_RX, wil->csr +
	HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, IMC));
	}

	static void wil6210_unmask_irq_misc(struct wil6210_priv *wil)
	{
	iowrite32(WIL6210_IMC_MISC, wil->csr +
	HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, IMC));
	}

	static void wil6210_unmask_irq_pseudo(struct wil6210_priv *wil)
	{
	wil_dbg_irq(wil, "%s()\n", __func__);

	set_bit(wil_status_irqen, &wil->status);

	iowrite32(WIL6210_IRQ_PSEUDO_MASK, wil->csr +
	HOSTADDR(RGF_DMA_PSEUDO_CAUSE_MASK_SW));
	}

	void wil6210_disable_irq(struct wil6210_priv *wil)
	{
	wil_dbg_irq(wil, "%s()\n", __func__);

	wil6210_mask_irq_tx(wil);
	wil6210_mask_irq_rx(wil);
	wil6210_mask_irq_misc(wil);
	wil6210_mask_irq_pseudo(wil);
	}

	void wil6210_enable_irq(struct wil6210_priv *wil)
	{
	wil_dbg_irq(wil, "%s()\n", __func__);

	iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, ICC));
	iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, ICC));
	iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, ICC));

	/* interrupt moderation parameters */
	if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
	/* disable interrupt moderation for monitor
	* to get better timestamp precision
	*/
	iowrite32(0, wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_CRL));
	} else {
	iowrite32(WIL6210_ITR_TRSH,
	wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_TRSH));
	iowrite32(BIT_DMA_ITR_CNT_CRL_EN,
	wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_CRL));
	}

	wil6210_unmask_irq_pseudo(wil);
	wil6210_unmask_irq_tx(wil);
	wil6210_unmask_irq_rx(wil);
	wil6210_unmask_irq_misc(wil);
	}

	static irqreturn_t wil6210_irq_rx(int irq, void *cookie)
	{
	struct wil6210_priv *wil = cookie;
	u32 isr = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, ICR));

	trace_wil6210_irq_rx(isr);
	wil_dbg_irq(wil, "ISR RX 0x%08x\n", isr);

	if (!isr) {
	wil_err(wil, "spurious IRQ: RX\n");
	return IRQ_NONE;
	}

	wil6210_mask_irq_rx(wil);

	if (isr & BIT_DMA_EP_RX_ICR_RX_DONE) {
	wil_dbg_irq(wil, "RX done\n");
	isr &= ~BIT_DMA_EP_RX_ICR_RX_DONE;
	wil_dbg_txrx(wil, "NAPI schedule\n");
	napi_schedule(&wil->napi_rx);
	}

	if (isr)
	wil_err(wil, "un-handled RX ISR bits 0x%08x\n", isr);

	/* Rx IRQ will be enabled when NAPI processing finished */

	return IRQ_HANDLED;
	}

	static irqreturn_t wil6210_irq_tx(int irq, void *cookie)
	{
	struct wil6210_priv *wil = cookie;
	u32 isr = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, ICR));

	trace_wil6210_irq_tx(isr);
	wil_dbg_irq(wil, "ISR TX 0x%08x\n", isr);

	if (!isr) {
	wil_err(wil, "spurious IRQ: TX\n");
	return IRQ_NONE;
	}

	wil6210_mask_irq_tx(wil);

	if (isr & BIT_DMA_EP_TX_ICR_TX_DONE) {
	wil_dbg_irq(wil, "TX done\n");
	napi_schedule(&wil->napi_tx);
	isr &= ~BIT_DMA_EP_TX_ICR_TX_DONE;
	/* clear also all VRING interrupts */
	isr &= ~(BIT(25) - 1UL);
	}

	if (isr)
	wil_err(wil, "un-handled TX ISR bits 0x%08x\n", isr);

	/* Tx IRQ will be enabled when NAPI processing finished */

	return IRQ_HANDLED;
	}

	static void wil_notify_fw_error(struct wil6210_priv *wil)
	{
	struct device *dev = &wil_to_ndev(wil)->dev;
	char *envp[3] = {
	[0] = "SOURCE=wil6210",
	[1] = "EVENT=FW_ERROR",
	[2] = NULL,
	};
	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
	}

	static void wil_cache_mbox_regs(struct wil6210_priv *wil)
	{
	/* make shadow copy of registers that should not change on run time */
	wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
	sizeof(struct wil6210_mbox_ctl));
	wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
	wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
	}

	static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
	{
	struct wil6210_priv *wil = cookie;
	u32 isr = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, ICR));

	trace_wil6210_irq_misc(isr);
	wil_dbg_irq(wil, "ISR MISC 0x%08x\n", isr);

	if (!isr) {
	wil_err(wil, "spurious IRQ: MISC\n");
	return IRQ_NONE;
	}

	wil6210_mask_irq_misc(wil);

	if (isr & ISR_MISC_FW_ERROR) {
	wil_err(wil, "Firmware error detected\n");
	clear_bit(wil_status_fwready, &wil->status);
	/*
	* do not clear @isr here - we do 2-nd part in thread
	* there, user space get notified, and it should be done
	* in non-atomic context
	*/
	}

	if (isr & ISR_MISC_FW_READY) {
	wil_dbg_irq(wil, "IRQ: FW ready\n");
	wil_cache_mbox_regs(wil);
	set_bit(wil_status_reset_done, &wil->status);
	/**
	* Actual FW ready indicated by the
	* WMI_FW_READY_EVENTID
	*/
	isr &= ~ISR_MISC_FW_READY;
	}

	wil->isr_misc = isr;

	if (isr) {
	return IRQ_WAKE_THREAD;
	} else {
	wil6210_unmask_irq_misc(wil);
	return IRQ_HANDLED;
	}
	}

	static irqreturn_t wil6210_irq_misc_thread(int irq, void *cookie)
	{
	struct wil6210_priv *wil = cookie;
	u32 isr = wil->isr_misc;

	trace_wil6210_irq_misc_thread(isr);
	wil_dbg_irq(wil, "Thread ISR MISC 0x%08x\n", isr);

	if (isr & ISR_MISC_FW_ERROR) {
	wil_notify_fw_error(wil);
	isr &= ~ISR_MISC_FW_ERROR;
	}

	if (isr & ISR_MISC_MBOX_EVT) {
	wil_dbg_irq(wil, "MBOX event\n");
	wmi_recv_cmd(wil);
	isr &= ~ISR_MISC_MBOX_EVT;
	}

	if (isr)
	wil_err(wil, "un-handled MISC ISR bits 0x%08x\n", isr);

	wil->isr_misc = 0;

	wil6210_unmask_irq_misc(wil);

	return IRQ_HANDLED;
	}

	/**
	* thread IRQ handler
	*/
	static irqreturn_t wil6210_thread_irq(int irq, void *cookie)
	{
	struct wil6210_priv *wil = cookie;

	wil_dbg_irq(wil, "Thread IRQ\n");
	/* Discover real IRQ cause */
	if (wil->isr_misc)
	wil6210_irq_misc_thread(irq, cookie);

	wil6210_unmask_irq_pseudo(wil);

	return IRQ_HANDLED;
	}

	/* DEBUG
	* There is subtle bug in hardware that causes IRQ to raise when it should be
	* masked. It is quite rare and hard to debug.
	*
	* Catch irq issue if it happens and print all I can.
	*/
	static int wil6210_debug_irq_mask(struct wil6210_priv *wil, u32 pseudo_cause)
	{
	if (!test_bit(wil_status_irqen, &wil->status)) {
	u32 icm_rx = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, ICM));
	u32 icr_rx = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, ICR));
	u32 imv_rx = ioread32(wil->csr +
	HOSTADDR(RGF_DMA_EP_RX_ICR) +
	offsetof(struct RGF_ICR, IMV));
	u32 icm_tx = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, ICM));
	u32 icr_tx = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, ICR));
	u32 imv_tx = ioread32(wil->csr +
	HOSTADDR(RGF_DMA_EP_TX_ICR) +
	offsetof(struct RGF_ICR, IMV));
	u32 icm_misc = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, ICM));
	u32 icr_misc = wil_ioread32_and_clear(wil->csr +
	HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, ICR));
	u32 imv_misc = ioread32(wil->csr +
	HOSTADDR(RGF_DMA_EP_MISC_ICR) +
	offsetof(struct RGF_ICR, IMV));
	wil_err(wil, "IRQ when it should be masked: pseudo 0x%08x\n"
	"Rx icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
	"Tx icm:icr:imv 0x%08x 0x%08x 0x%08x\n"
	"Misc icm:icr:imv 0x%08x 0x%08x 0x%08x\n",
	pseudo_cause,
	icm_rx, icr_rx, imv_rx,
	icm_tx, icr_tx, imv_tx,
	icm_misc, icr_misc, imv_misc);

	return -EINVAL;
	}

	return 0;
	}

	static irqreturn_t wil6210_hardirq(int irq, void *cookie)
	{
	irqreturn_t rc = IRQ_HANDLED;
	struct wil6210_priv *wil = cookie;
	u32 pseudo_cause = ioread32(wil->csr + HOSTADDR(RGF_DMA_PSEUDO_CAUSE));

	/**
	* pseudo_cause is Clear-On-Read, no need to ACK
	*/
	if ((pseudo_cause == 0) \|\| ((pseudo_cause & 0xff) == 0xff))
	return IRQ_NONE;

	/* FIXME: IRQ mask debug */
	if (wil6210_debug_irq_mask(wil, pseudo_cause))
	return IRQ_NONE;

	trace_wil6210_irq_pseudo(pseudo_cause);
	wil_dbg_irq(wil, "Pseudo IRQ 0x%08x\n", pseudo_cause);

	wil6210_mask_irq_pseudo(wil);

	/* Discover real IRQ cause
	* There are 2 possible phases for every IRQ:
	* - hard IRQ handler called right here
	* - threaded handler called later
	*
	* Hard IRQ handler reads and clears ISR.
	*
	* If threaded handler requested, hard IRQ handler
	* returns IRQ_WAKE_THREAD and saves ISR register value
	* for the threaded handler use.
	*
	* voting for wake thread - need at least 1 vote
	*/
	if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_RX) &&
	(wil6210_irq_rx(irq, cookie) == IRQ_WAKE_THREAD))
	rc = IRQ_WAKE_THREAD;

	if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_TX) &&
	(wil6210_irq_tx(irq, cookie) == IRQ_WAKE_THREAD))
	rc = IRQ_WAKE_THREAD;

	if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_MISC) &&
	(wil6210_irq_misc(irq, cookie) == IRQ_WAKE_THREAD))
	rc = IRQ_WAKE_THREAD;

	/* if thread is requested, it will unmask IRQ */
	if (rc != IRQ_WAKE_THREAD)
	wil6210_unmask_irq_pseudo(wil);

	return rc;
	}

	static int wil6210_request_3msi(struct wil6210_priv *wil, int irq)
	{
	int rc;
	/*
	* IRQ's are in the following order:
	* - Tx
	* - Rx
	* - Misc
	*/

	rc = request_irq(irq, wil6210_irq_tx, IRQF_SHARED,
	WIL_NAME"_tx", wil);
	if (rc)
	return rc;

	rc = request_irq(irq + 1, wil6210_irq_rx, IRQF_SHARED,
	WIL_NAME"_rx", wil);
	if (rc)
	goto free0;

	rc = request_threaded_irq(irq + 2, wil6210_irq_misc,
	wil6210_irq_misc_thread,
	IRQF_SHARED, WIL_NAME"_misc", wil);
	if (rc)
	goto free1;

	return 0;
	/* error branch */
	free1:
	free_irq(irq + 1, wil);
	free0:
	free_irq(irq, wil);

	return rc;
	}

	int wil6210_init_irq(struct wil6210_priv *wil, int irq)
	{
	int rc;
	if (wil->n_msi == 3)
	rc = wil6210_request_3msi(wil, irq);
	else
	rc = request_threaded_irq(irq, wil6210_hardirq,
	wil6210_thread_irq,
	wil->n_msi ? 0 : IRQF_SHARED,
	WIL_NAME, wil);
	if (rc)
	return rc;

	wil6210_enable_irq(wil);

	return 0;
	}

	void wil6210_fini_irq(struct wil6210_priv *wil, int irq)
	{
	wil6210_disable_irq(wil);
	free_irq(irq, wil);
	if (wil->n_msi == 3) {
	free_irq(irq + 1, wil);
	free_irq(irq + 2, wil);
	}
	}