drivers/staging/meilhaus/me0600_ext_irq.c - kernel/windcharger - Git at Google

 /**
  * @file me0600_ext_irq.c
  *
  * @brief ME-630 external interrupt subdevice instance.
  * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
  * @author Guenter Gebhardt
  * @author Krzysztof Gantzke	(k.gantzke@meilhaus.de)
  */

 /*
  * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #ifndef __KERNEL__
 #  define __KERNEL__
 #endif

 /*
  * Includes
  */
 #include <linux/module.h>

 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>

 #include "medefines.h"
 #include "meinternal.h"
 #include "meerror.h"
 #include "meids.h"
 #include "medebug.h"

 #include "meplx_reg.h"
 #include "me0600_ext_irq_reg.h"
 #include "me0600_ext_irq.h"

 /*
  * Functions
  */

 static int me0600_ext_irq_io_irq_start(struct me_subdevice *subdevice,
 				       struct file *filep,
 				       int channel,
 				       int irq_source,
 				       int irq_edge, int irq_arg, int flags)
 {
 	me0600_ext_irq_subdevice_t *instance;
 	uint32_t tmp;
 	unsigned long cpu_flags;

 	PDEBUG("executed.\n");

 	instance = (me0600_ext_irq_subdevice_t *) subdevice;

 	if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
 		PERROR("Invalid flag specified.\n");
 		return ME_ERRNO_INVALID_FLAGS;
 	}

 	if (instance->lintno > 1) {
 		PERROR("Wrong idx=%d.\n", instance->lintno);
 		return ME_ERRNO_INVALID_SUBDEVICE;
 	}

 	if (channel) {
 		PERROR("Invalid channel specified.\n");
 		return ME_ERRNO_INVALID_CHANNEL;
 	}

 	if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
 		PERROR("Invalid irq source specified.\n");
 		return ME_ERRNO_INVALID_IRQ_SOURCE;
 	}

 	if (irq_edge != ME_IRQ_EDGE_RISING) {
 		PERROR("Invalid irq edge specified.\n");
 		return ME_ERRNO_INVALID_IRQ_EDGE;
 	}

 	ME_SUBDEVICE_ENTER;

 	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 	spin_lock(instance->intcsr_lock);
 	tmp = inl(instance->intcsr);
 	switch (instance->lintno) {
 	case 0:
 		tmp |=
 		    PLX_INTCSR_LOCAL_INT1_EN | PLX_INTCSR_LOCAL_INT1_POL |
 		    PLX_INTCSR_PCI_INT_EN;
 		break;
 	case 1:
 		tmp |=
 		    PLX_INTCSR_LOCAL_INT2_EN | PLX_INTCSR_LOCAL_INT2_POL |
 		    PLX_INTCSR_PCI_INT_EN;
 		break;
 	}
 	outl(tmp, instance->intcsr);
 	PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
 	spin_unlock(instance->intcsr_lock);
 	instance->rised = 0;
 	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);

 	ME_SUBDEVICE_EXIT;

 	return ME_ERRNO_SUCCESS;
 }

 static int me0600_ext_irq_io_irq_wait(struct me_subdevice *subdevice,
 				      struct file *filep,
 				      int channel,
 				      int *irq_count,
 				      int *value, int time_out, int flags)
 {
 	me0600_ext_irq_subdevice_t *instance;
 	int err = ME_ERRNO_SUCCESS;
 	long t = 0;
 	unsigned long cpu_flags;

 	PDEBUG("executed.\n");

 	instance = (me0600_ext_irq_subdevice_t *) subdevice;

 	if (flags) {
 		PERROR("Invalid flag specified.\n");
 		return ME_ERRNO_INVALID_FLAGS;
 	}

 	if (channel) {
 		PERROR("Invalid channel specified.\n");
 		return ME_ERRNO_INVALID_CHANNEL;
 	}

 	if (time_out < 0) {
 		PERROR("Invalid time_out specified.\n");
 		return ME_ERRNO_INVALID_TIMEOUT;
 	}

 	if (time_out) {
 		t = (time_out * HZ) / 1000;

 		if (t == 0)
 			t = 1;
 	}

 	ME_SUBDEVICE_ENTER;

 	if (instance->rised <= 0) {
 		instance->rised = 0;

 		if (time_out) {
 			t = wait_event_interruptible_timeout(instance->
 							     wait_queue,
 							     (instance->rised !=
 							      0), t);

 			if (t == 0) {
 				PERROR("Wait on interrupt timed out.\n");
 				err = ME_ERRNO_TIMEOUT;
 			}
 		} else {
 			wait_event_interruptible(instance->wait_queue,
 						 (instance->rised != 0));
 		}

 		if (instance->rised < 0) {
 			PERROR("Wait on interrupt aborted by user.\n");
 			err = ME_ERRNO_CANCELLED;
 		}
 	}

 	if (signal_pending(current)) {
 		PERROR("Wait on interrupt aborted by signal.\n");
 		err = ME_ERRNO_SIGNAL;
 	}

 	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 	instance->rised = 0;
 	*irq_count = instance->n;
 	*value = 1;
 	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);

 	ME_SUBDEVICE_EXIT;

 	return err;
 }

 static int me0600_ext_irq_io_irq_stop(struct me_subdevice *subdevice,
 				      struct file *filep,
 				      int channel, int flags)
 {
 	me0600_ext_irq_subdevice_t *instance;
 	int err = ME_ERRNO_SUCCESS;
 	uint32_t tmp;
 	unsigned long cpu_flags;

 	PDEBUG("executed.\n");

 	instance = (me0600_ext_irq_subdevice_t *) subdevice;

 	if (flags) {
 		PERROR("Invalid flag specified.\n");
 		return ME_ERRNO_INVALID_FLAGS;
 	}

 	if (instance->lintno > 1) {
 		PERROR("Wrong idx=%d.\n", instance->lintno);
 		return ME_ERRNO_INVALID_SUBDEVICE;
 	}

 	if (channel) {
 		PERROR("Invalid channel specified.\n");
 		return ME_ERRNO_INVALID_CHANNEL;
 	}

 	ME_SUBDEVICE_ENTER;

 	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 	spin_lock(instance->intcsr_lock);
 	tmp = inl(instance->intcsr);
 	switch (instance->lintno) {
 	case 0:
 		tmp &= ~PLX_INTCSR_LOCAL_INT1_EN;
 		break;
 	case 1:
 		tmp &= ~PLX_INTCSR_LOCAL_INT2_EN;
 		break;
 	}
 	outl(tmp, instance->intcsr);
 	PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
 	spin_unlock(instance->intcsr_lock);
 	instance->rised = -1;
 	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 	wake_up_interruptible_all(&instance->wait_queue);

 	ME_SUBDEVICE_EXIT;

 	return err;
 }

 static int me0600_ext_irq_io_reset_subdevice(struct me_subdevice *subdevice,
 					     struct file *filep, int flags)
 {
 	me0600_ext_irq_subdevice_t *instance;
 	uint32_t tmp;
 	unsigned long cpu_flags;

 	PDEBUG("executed.\n");

 	instance = (me0600_ext_irq_subdevice_t *) subdevice;

 	if (flags) {
 		PERROR("Invalid flag specified.\n");
 		return ME_ERRNO_INVALID_FLAGS;
 	}

 	ME_SUBDEVICE_ENTER;

 	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
 	spin_lock(instance->intcsr_lock);
 	tmp = inl(instance->intcsr);
 	switch (instance->lintno) {
 	case 0:
 		tmp |= PLX_INTCSR_LOCAL_INT1_POL | PLX_INTCSR_PCI_INT_EN;
 		tmp &= ~PLX_INTCSR_LOCAL_INT1_EN;
 		break;
 	case 1:
 		tmp |= PLX_INTCSR_LOCAL_INT2_POL | PLX_INTCSR_PCI_INT_EN;
 		tmp &= ~PLX_INTCSR_LOCAL_INT2_EN;
 		break;
 	}
 	outl(tmp, instance->intcsr);
 	PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
 	spin_unlock(instance->intcsr_lock);

 	instance->rised = -1;
 	instance->n = 0;
 	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
 	wake_up_interruptible_all(&instance->wait_queue);

 	ME_SUBDEVICE_EXIT;

 	return ME_ERRNO_SUCCESS;
 }

 static int me0600_ext_irq_query_number_channels(struct me_subdevice *subdevice,
 						int *number)
 {
 	PDEBUG("executed.\n");
 	*number = 1;
 	return ME_ERRNO_SUCCESS;
 }

 static int me0600_ext_irq_query_subdevice_type(struct me_subdevice *subdevice,
 					       int *type, int *subtype)
 {
 	PDEBUG("executed.\n");
 	*type = ME_TYPE_EXT_IRQ;
 	*subtype = ME_SUBTYPE_SINGLE;
 	return ME_ERRNO_SUCCESS;
 }

 static int me0600_ext_irq_query_subdevice_caps(struct me_subdevice *subdevice,
 					       int *caps)
 {
 	PDEBUG("executed.\n");
 	*caps = ME_CAPS_EXT_IRQ_EDGE_RISING;
 	return ME_ERRNO_SUCCESS;
 }

 static void me0600_ext_irq_destructor(struct me_subdevice *subdevice)
 {
 	me0600_ext_irq_subdevice_t *instance;

 	PDEBUG("executed.\n");

 	instance = (me0600_ext_irq_subdevice_t *) subdevice;

 	free_irq(instance->irq, (void *)instance);
 	me_subdevice_deinit(&instance->base);
 	kfree(instance);
 }

 static irqreturn_t me0600_isr(int irq, void *dev_id)
 {
 	me0600_ext_irq_subdevice_t *instance;
 	uint32_t status;
 	uint32_t mask = PLX_INTCSR_PCI_INT_EN;
 	irqreturn_t ret = IRQ_HANDLED;

 	instance = (me0600_ext_irq_subdevice_t *) dev_id;

 	if (irq != instance->irq) {
 		PERROR("Incorrect interrupt num: %d.\n", irq);
 		return IRQ_NONE;
 	}

 	PDEBUG("executed.\n");

 	if (instance->lintno > 1) {
 		PERROR_CRITICAL
 		    ("%s():Wrong subdevice index=%d plx:irq_status_reg=0x%04X.\n",
 		     __func__, instance->lintno, inl(instance->intcsr));
 		return IRQ_NONE;
 	}

 	spin_lock(&instance->subdevice_lock);
 	spin_lock(instance->intcsr_lock);
 	status = inl(instance->intcsr);
 	switch (instance->lintno) {
 	case 0:
 		mask |= PLX_INTCSR_LOCAL_INT1_STATE | PLX_INTCSR_LOCAL_INT1_EN;
 		break;
 	case 1:
 		mask |= PLX_INTCSR_LOCAL_INT2_STATE | PLX_INTCSR_LOCAL_INT2_EN;
 		break;
 	}

 	if ((status & mask) == mask) {
 		instance->rised = 1;
 		instance->n++;
 		inb(instance->reset_reg);
 		PDEBUG("Interrupt detected.\n");
 	} else {
 		PINFO
 		    ("%ld Shared interrupt. %s(): idx=0 plx:irq_status_reg=0x%04X\n",
 		     jiffies, __func__, status);
 		ret = IRQ_NONE;
 	}
 	spin_unlock(instance->intcsr_lock);
 	spin_unlock(&instance->subdevice_lock);

 	wake_up_interruptible_all(&instance->wait_queue);

 	return ret;
 }

 me0600_ext_irq_subdevice_t *me0600_ext_irq_constructor(uint32_t plx_reg_base,
 						       uint32_t me0600_reg_base,
 						       spinlock_t *intcsr_lock,
 						       unsigned ext_irq_idx,
 						       int irq)
 {
 	me0600_ext_irq_subdevice_t *subdevice;
 	int err;

 	PDEBUG("executed.\n");

 	/* Allocate memory for subdevice instance */
 	subdevice = kmalloc(sizeof(me0600_ext_irq_subdevice_t), GFP_KERNEL);

 	if (!subdevice) {
 		PERROR("Cannot get memory for 630_ext_irq instance.\n");
 		return NULL;
 	}

 	memset(subdevice, 0, sizeof(me0600_ext_irq_subdevice_t));

 	/* Initialize subdevice base class */
 	err = me_subdevice_init(&subdevice->base);

 	if (err) {
 		PERROR("Cannot initialize subdevice base class instance.\n");
 		kfree(subdevice);
 		return NULL;
 	}
 	// Initialize spin locks.
 	spin_lock_init(&subdevice->subdevice_lock);

 	subdevice->intcsr_lock = intcsr_lock;

 	/* Initialize wait queue */
 	init_waitqueue_head(&subdevice->wait_queue);

 	subdevice->lintno = ext_irq_idx;

 	/* Request interrupt line */
 	subdevice->irq = irq;

 	err = request_irq(subdevice->irq, me0600_isr,
 			  IRQF_DISABLED | IRQF_SHARED,
 			  ME0600_NAME, (void *)subdevice);

 	if (err) {
 		PERROR("Cannot get interrupt line.\n");
 		kfree(subdevice);
 		return NULL;
 	}
 	PINFO("Registered irq=%d.\n", subdevice->irq);

 	/* Initialize registers */
 	subdevice->intcsr = plx_reg_base + PLX_INTCSR;
 	subdevice->reset_reg =
 	    me0600_reg_base + ME0600_INT_0_RESET_REG + ext_irq_idx;

 	/* Initialize the subdevice methods */
 	subdevice->base.me_subdevice_io_irq_start = me0600_ext_irq_io_irq_start;
 	subdevice->base.me_subdevice_io_irq_wait = me0600_ext_irq_io_irq_wait;
 	subdevice->base.me_subdevice_io_irq_stop = me0600_ext_irq_io_irq_stop;
 	subdevice->base.me_subdevice_io_reset_subdevice =
 	    me0600_ext_irq_io_reset_subdevice;
 	subdevice->base.me_subdevice_query_number_channels =
 	    me0600_ext_irq_query_number_channels;
 	subdevice->base.me_subdevice_query_subdevice_type =
 	    me0600_ext_irq_query_subdevice_type;
 	subdevice->base.me_subdevice_query_subdevice_caps =
 	    me0600_ext_irq_query_subdevice_caps;
 	subdevice->base.me_subdevice_destructor = me0600_ext_irq_destructor;

 	subdevice->rised = 0;
 	subdevice->n = 0;

 	return subdevice;
 }
	/**
	* @file me0600_ext_irq.c
	*
	* @brief ME-630 external interrupt subdevice instance.
	* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
	* @author Guenter Gebhardt
	* @author Krzysztof Gantzke (k.gantzke@meilhaus.de)
	*/

	/*
	* Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
	*
	* This file is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#ifndef __KERNEL__
	# define __KERNEL__
	#endif

	/*
	* Includes
	*/
	#include <linux/module.h>

	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/io.h>
	#include <linux/types.h>
	#include <linux/interrupt.h>

	#include "medefines.h"
	#include "meinternal.h"
	#include "meerror.h"
	#include "meids.h"
	#include "medebug.h"

	#include "meplx_reg.h"
	#include "me0600_ext_irq_reg.h"
	#include "me0600_ext_irq.h"

	/*
	* Functions
	*/

	static int me0600_ext_irq_io_irq_start(struct me_subdevice *subdevice,
	struct file *filep,
	int channel,
	int irq_source,
	int irq_edge, int irq_arg, int flags)
	{
	me0600_ext_irq_subdevice_t *instance;
	uint32_t tmp;
	unsigned long cpu_flags;

	PDEBUG("executed.\n");

	instance = (me0600_ext_irq_subdevice_t *) subdevice;

	if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
	PERROR("Invalid flag specified.\n");
	return ME_ERRNO_INVALID_FLAGS;
	}

	if (instance->lintno > 1) {
	PERROR("Wrong idx=%d.\n", instance->lintno);
	return ME_ERRNO_INVALID_SUBDEVICE;
	}

	if (channel) {
	PERROR("Invalid channel specified.\n");
	return ME_ERRNO_INVALID_CHANNEL;
	}

	if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
	PERROR("Invalid irq source specified.\n");
	return ME_ERRNO_INVALID_IRQ_SOURCE;
	}

	if (irq_edge != ME_IRQ_EDGE_RISING) {
	PERROR("Invalid irq edge specified.\n");
	return ME_ERRNO_INVALID_IRQ_EDGE;
	}

	ME_SUBDEVICE_ENTER;

	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
	spin_lock(instance->intcsr_lock);
	tmp = inl(instance->intcsr);
	switch (instance->lintno) {
	case 0:
	tmp \|=
	PLX_INTCSR_LOCAL_INT1_EN \| PLX_INTCSR_LOCAL_INT1_POL \|
	PLX_INTCSR_PCI_INT_EN;
	break;
	case 1:
	tmp \|=
	PLX_INTCSR_LOCAL_INT2_EN \| PLX_INTCSR_LOCAL_INT2_POL \|
	PLX_INTCSR_PCI_INT_EN;
	break;
	}
	outl(tmp, instance->intcsr);
	PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
	spin_unlock(instance->intcsr_lock);
	instance->rised = 0;
	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);

	ME_SUBDEVICE_EXIT;

	return ME_ERRNO_SUCCESS;
	}

	static int me0600_ext_irq_io_irq_wait(struct me_subdevice *subdevice,
	struct file *filep,
	int channel,
	int *irq_count,
	int *value, int time_out, int flags)
	{
	me0600_ext_irq_subdevice_t *instance;
	int err = ME_ERRNO_SUCCESS;
	long t = 0;
	unsigned long cpu_flags;

	PDEBUG("executed.\n");

	instance = (me0600_ext_irq_subdevice_t *) subdevice;

	if (flags) {
	PERROR("Invalid flag specified.\n");
	return ME_ERRNO_INVALID_FLAGS;
	}

	if (channel) {
	PERROR("Invalid channel specified.\n");
	return ME_ERRNO_INVALID_CHANNEL;
	}

	if (time_out < 0) {
	PERROR("Invalid time_out specified.\n");
	return ME_ERRNO_INVALID_TIMEOUT;
	}

	if (time_out) {
	t = (time_out * HZ) / 1000;

	if (t == 0)
	t = 1;
	}

	ME_SUBDEVICE_ENTER;

	if (instance->rised <= 0) {
	instance->rised = 0;

	if (time_out) {
	t = wait_event_interruptible_timeout(instance->
	wait_queue,
	(instance->rised !=
	0), t);

	if (t == 0) {
	PERROR("Wait on interrupt timed out.\n");
	err = ME_ERRNO_TIMEOUT;
	}
	} else {
	wait_event_interruptible(instance->wait_queue,
	(instance->rised != 0));
	}

	if (instance->rised < 0) {
	PERROR("Wait on interrupt aborted by user.\n");
	err = ME_ERRNO_CANCELLED;
	}
	}

	if (signal_pending(current)) {
	PERROR("Wait on interrupt aborted by signal.\n");
	err = ME_ERRNO_SIGNAL;
	}

	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
	instance->rised = 0;
	*irq_count = instance->n;
	*value = 1;
	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);

	ME_SUBDEVICE_EXIT;

	return err;
	}

	static int me0600_ext_irq_io_irq_stop(struct me_subdevice *subdevice,
	struct file *filep,
	int channel, int flags)
	{
	me0600_ext_irq_subdevice_t *instance;
	int err = ME_ERRNO_SUCCESS;
	uint32_t tmp;
	unsigned long cpu_flags;

	PDEBUG("executed.\n");

	instance = (me0600_ext_irq_subdevice_t *) subdevice;

	if (flags) {
	PERROR("Invalid flag specified.\n");
	return ME_ERRNO_INVALID_FLAGS;
	}

	if (instance->lintno > 1) {
	PERROR("Wrong idx=%d.\n", instance->lintno);
	return ME_ERRNO_INVALID_SUBDEVICE;
	}

	if (channel) {
	PERROR("Invalid channel specified.\n");
	return ME_ERRNO_INVALID_CHANNEL;
	}

	ME_SUBDEVICE_ENTER;

	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
	spin_lock(instance->intcsr_lock);
	tmp = inl(instance->intcsr);
	switch (instance->lintno) {
	case 0:
	tmp &= ~PLX_INTCSR_LOCAL_INT1_EN;
	break;
	case 1:
	tmp &= ~PLX_INTCSR_LOCAL_INT2_EN;
	break;
	}
	outl(tmp, instance->intcsr);
	PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
	spin_unlock(instance->intcsr_lock);
	instance->rised = -1;
	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
	wake_up_interruptible_all(&instance->wait_queue);

	ME_SUBDEVICE_EXIT;

	return err;
	}

	static int me0600_ext_irq_io_reset_subdevice(struct me_subdevice *subdevice,
	struct file *filep, int flags)
	{
	me0600_ext_irq_subdevice_t *instance;
	uint32_t tmp;
	unsigned long cpu_flags;

	PDEBUG("executed.\n");

	instance = (me0600_ext_irq_subdevice_t *) subdevice;

	if (flags) {
	PERROR("Invalid flag specified.\n");
	return ME_ERRNO_INVALID_FLAGS;
	}

	ME_SUBDEVICE_ENTER;

	spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
	spin_lock(instance->intcsr_lock);
	tmp = inl(instance->intcsr);
	switch (instance->lintno) {
	case 0:
	tmp \|= PLX_INTCSR_LOCAL_INT1_POL \| PLX_INTCSR_PCI_INT_EN;
	tmp &= ~PLX_INTCSR_LOCAL_INT1_EN;
	break;
	case 1:
	tmp \|= PLX_INTCSR_LOCAL_INT2_POL \| PLX_INTCSR_PCI_INT_EN;
	tmp &= ~PLX_INTCSR_LOCAL_INT2_EN;
	break;
	}
	outl(tmp, instance->intcsr);
	PDEBUG_REG("intcsr outl(plx:0x%X)=0x%x\n", instance->intcsr, tmp);
	spin_unlock(instance->intcsr_lock);

	instance->rised = -1;
	instance->n = 0;
	spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
	wake_up_interruptible_all(&instance->wait_queue);

	ME_SUBDEVICE_EXIT;

	return ME_ERRNO_SUCCESS;
	}

	static int me0600_ext_irq_query_number_channels(struct me_subdevice *subdevice,
	int *number)
	{
	PDEBUG("executed.\n");
	*number = 1;
	return ME_ERRNO_SUCCESS;
	}

	static int me0600_ext_irq_query_subdevice_type(struct me_subdevice *subdevice,
	int type, int subtype)
	{
	PDEBUG("executed.\n");
	*type = ME_TYPE_EXT_IRQ;
	*subtype = ME_SUBTYPE_SINGLE;
	return ME_ERRNO_SUCCESS;
	}

	static int me0600_ext_irq_query_subdevice_caps(struct me_subdevice *subdevice,
	int *caps)
	{
	PDEBUG("executed.\n");
	*caps = ME_CAPS_EXT_IRQ_EDGE_RISING;
	return ME_ERRNO_SUCCESS;
	}

	static void me0600_ext_irq_destructor(struct me_subdevice *subdevice)
	{
	me0600_ext_irq_subdevice_t *instance;

	PDEBUG("executed.\n");

	instance = (me0600_ext_irq_subdevice_t *) subdevice;

	free_irq(instance->irq, (void *)instance);
	me_subdevice_deinit(&instance->base);
	kfree(instance);
	}

	static irqreturn_t me0600_isr(int irq, void *dev_id)
	{
	me0600_ext_irq_subdevice_t *instance;
	uint32_t status;
	uint32_t mask = PLX_INTCSR_PCI_INT_EN;
	irqreturn_t ret = IRQ_HANDLED;

	instance = (me0600_ext_irq_subdevice_t *) dev_id;

	if (irq != instance->irq) {
	PERROR("Incorrect interrupt num: %d.\n", irq);
	return IRQ_NONE;
	}

	PDEBUG("executed.\n");

	if (instance->lintno > 1) {
	PERROR_CRITICAL
	("%s():Wrong subdevice index=%d plx:irq_status_reg=0x%04X.\n",
	__func__, instance->lintno, inl(instance->intcsr));
	return IRQ_NONE;
	}

	spin_lock(&instance->subdevice_lock);
	spin_lock(instance->intcsr_lock);
	status = inl(instance->intcsr);
	switch (instance->lintno) {
	case 0:
	mask \|= PLX_INTCSR_LOCAL_INT1_STATE \| PLX_INTCSR_LOCAL_INT1_EN;
	break;
	case 1:
	mask \|= PLX_INTCSR_LOCAL_INT2_STATE \| PLX_INTCSR_LOCAL_INT2_EN;
	break;
	}

	if ((status & mask) == mask) {
	instance->rised = 1;
	instance->n++;
	inb(instance->reset_reg);
	PDEBUG("Interrupt detected.\n");
	} else {
	PINFO
	("%ld Shared interrupt. %s(): idx=0 plx:irq_status_reg=0x%04X\n",
	jiffies, __func__, status);
	ret = IRQ_NONE;
	}
	spin_unlock(instance->intcsr_lock);
	spin_unlock(&instance->subdevice_lock);

	wake_up_interruptible_all(&instance->wait_queue);

	return ret;
	}

	me0600_ext_irq_subdevice_t *me0600_ext_irq_constructor(uint32_t plx_reg_base,
	uint32_t me0600_reg_base,
	spinlock_t *intcsr_lock,
	unsigned ext_irq_idx,
	int irq)
	{
	me0600_ext_irq_subdevice_t *subdevice;
	int err;

	PDEBUG("executed.\n");

	/* Allocate memory for subdevice instance */
	subdevice = kmalloc(sizeof(me0600_ext_irq_subdevice_t), GFP_KERNEL);

	if (!subdevice) {
	PERROR("Cannot get memory for 630_ext_irq instance.\n");
	return NULL;
	}

	memset(subdevice, 0, sizeof(me0600_ext_irq_subdevice_t));

	/* Initialize subdevice base class */
	err = me_subdevice_init(&subdevice->base);

	if (err) {
	PERROR("Cannot initialize subdevice base class instance.\n");
	kfree(subdevice);
	return NULL;
	}
	// Initialize spin locks.
	spin_lock_init(&subdevice->subdevice_lock);

	subdevice->intcsr_lock = intcsr_lock;

	/* Initialize wait queue */
	init_waitqueue_head(&subdevice->wait_queue);

	subdevice->lintno = ext_irq_idx;

	/* Request interrupt line */
	subdevice->irq = irq;

	err = request_irq(subdevice->irq, me0600_isr,
	IRQF_DISABLED \| IRQF_SHARED,
	ME0600_NAME, (void *)subdevice);

	if (err) {
	PERROR("Cannot get interrupt line.\n");
	kfree(subdevice);
	return NULL;
	}
	PINFO("Registered irq=%d.\n", subdevice->irq);

	/* Initialize registers */
	subdevice->intcsr = plx_reg_base + PLX_INTCSR;
	subdevice->reset_reg =
	me0600_reg_base + ME0600_INT_0_RESET_REG + ext_irq_idx;

	/* Initialize the subdevice methods */
	subdevice->base.me_subdevice_io_irq_start = me0600_ext_irq_io_irq_start;
	subdevice->base.me_subdevice_io_irq_wait = me0600_ext_irq_io_irq_wait;
	subdevice->base.me_subdevice_io_irq_stop = me0600_ext_irq_io_irq_stop;
	subdevice->base.me_subdevice_io_reset_subdevice =
	me0600_ext_irq_io_reset_subdevice;
	subdevice->base.me_subdevice_query_number_channels =
	me0600_ext_irq_query_number_channels;
	subdevice->base.me_subdevice_query_subdevice_type =
	me0600_ext_irq_query_subdevice_type;
	subdevice->base.me_subdevice_query_subdevice_caps =
	me0600_ext_irq_query_subdevice_caps;
	subdevice->base.me_subdevice_destructor = me0600_ext_irq_destructor;

	subdevice->rised = 0;
	subdevice->n = 0;

	return subdevice;
	}