/**
* @file me4600_ext_irq.c
*
* @brief ME-4000 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/interrupt.h>
#include <linux/io.h>
#include <linux/types.h>
#include "medefines.h"
#include "meinternal.h"
#include "meerror.h"
#include "medebug.h"
#include "meids.h"
#include "me4600_reg.h"
#include "me4600_ai_reg.h"
#include "me4600_ext_irq_reg.h"
#include "me4600_ext_irq.h"
/*
* Defines
*/
/*
* Functions
*/
static int me4600_ext_irq_io_irq_start(me_subdevice_t *subdevice,
struct file *filep,
int channel,
int irq_source,
int irq_edge, int irq_arg, int flags)
{
me4600_ext_irq_subdevice_t *instance;
int err = ME_ERRNO_SUCCESS;
unsigned long cpu_flags;
uint32_t tmp;
PDEBUG("executed.\n");
instance = (me4600_ext_irq_subdevice_t *) subdevice;
if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
PERROR("Invalid flag specified.\n");
return ME_ERRNO_INVALID_FLAGS;
}
if ((irq_edge != ME_IRQ_EDGE_RISING)
&& (irq_edge != ME_IRQ_EDGE_FALLING)
&& (irq_edge != ME_IRQ_EDGE_ANY)
) {
PERROR("Invalid irq edge specified.\n");
return ME_ERRNO_INVALID_IRQ_EDGE;
}
if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
PERROR("Invalid irq source specified.\n");
return ME_ERRNO_INVALID_IRQ_SOURCE;
}
if (channel) {
PERROR("Invalid channel specified.\n");
return ME_ERRNO_INVALID_CHANNEL;
}
ME_SUBDEVICE_ENTER;
spin_lock(&instance->subdevice_lock);
tmp = 0x0; //inl(instance->ext_irq_config_reg);
if (irq_edge == ME_IRQ_EDGE_RISING) {
//tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
//tmp |= ME4600_EXT_IRQ_CONFIG_MASK_RISING;
} else if (irq_edge == ME_IRQ_EDGE_FALLING) {
//tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
//tmp |= ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
tmp = ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
} else if (irq_edge == ME_IRQ_EDGE_ANY) {
//tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
//tmp |= ME4600_EXT_IRQ_CONFIG_MASK_ANY;
tmp = ME4600_EXT_IRQ_CONFIG_MASK_ANY;
}
outl(tmp, instance->ext_irq_config_reg);
PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
instance->reg_base,
instance->ext_irq_config_reg - instance->reg_base, tmp);
spin_lock_irqsave(instance->ctrl_reg_lock, cpu_flags);
tmp = inl(instance->ctrl_reg);
tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
tmp |= ME4600_AI_CTRL_BIT_EX_IRQ;
outl(tmp, instance->ctrl_reg);
spin_unlock_irqrestore(instance->ctrl_reg_lock, cpu_flags);
instance->rised = 0;
spin_unlock(&instance->subdevice_lock);
ME_SUBDEVICE_EXIT;
return err;
}
static int me4600_ext_irq_io_irq_wait(me_subdevice_t *subdevice,
struct file *filep,
int channel,
int *irq_count,
int *value, int time_out, int flags)
{
me4600_ext_irq_subdevice_t *instance;
int err = ME_ERRNO_SUCCESS;
long t = 0;
unsigned long cpu_flags;
PDEBUG("executed.\n");
instance = (me4600_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 external 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 external interrupt aborted by signal.\n");
err = ME_ERRNO_SIGNAL;
}
spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
instance->rised = 0;
*irq_count = instance->count;
*value = instance->value;
spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
ME_SUBDEVICE_EXIT;
return err;
}
static int me4600_ext_irq_io_irq_stop(me_subdevice_t *subdevice,
struct file *filep,
int channel, int flags)
{
me4600_ext_irq_subdevice_t *instance;
int err = ME_ERRNO_SUCCESS;
unsigned long cpu_flags;
uint32_t tmp;
PDEBUG("executed.\n");
instance = (me4600_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;
}
ME_SUBDEVICE_ENTER;
spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
spin_lock(instance->ctrl_reg_lock);
tmp = inl(instance->ctrl_reg);
tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
outl(tmp, instance->ctrl_reg);
PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
instance->ctrl_reg - instance->reg_base, tmp);
spin_unlock(instance->ctrl_reg_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 me4600_ext_irq_io_reset_subdevice(me_subdevice_t *subdevice,
struct file *filep, int flags)
{
me4600_ext_irq_subdevice_t *instance;
unsigned long cpu_flags;
uint32_t tmp;
PDEBUG("executed.\n");
instance = (me4600_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->ctrl_reg_lock);
tmp = inl(instance->ctrl_reg);
tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
outl(tmp, instance->ctrl_reg);
PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
instance->ctrl_reg - instance->reg_base, tmp);
spin_unlock(instance->ctrl_reg_lock);
instance->rised = -1;
instance->count = 0;
outl(ME4600_EXT_IRQ_CONFIG_MASK_ANY, instance->ext_irq_config_reg);
PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
instance->reg_base,
instance->ext_irq_config_reg - instance->reg_base,
ME4600_EXT_IRQ_CONFIG_MASK_ANY);
spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
wake_up_interruptible_all(&instance->wait_queue);
ME_SUBDEVICE_EXIT;
return ME_ERRNO_SUCCESS;
}
static void me4600_ext_irq_destructor(struct me_subdevice *subdevice)
{
me4600_ext_irq_subdevice_t *instance;
PDEBUG("executed.\n");
instance = (me4600_ext_irq_subdevice_t *) subdevice;
me_subdevice_deinit(&instance->base);
free_irq(instance->irq, instance);
kfree(instance);
}
static int me4600_ext_irq_query_number_channels(me_subdevice_t *subdevice,
int *number)
{
PDEBUG("executed.\n");
*number = 1;
return ME_ERRNO_SUCCESS;
}
static int me4600_ext_irq_query_subdevice_type(me_subdevice_t *subdevice,
int *type, int *subtype)
{
PDEBUG("executed.\n");
*type = ME_TYPE_EXT_IRQ;
*subtype = ME_SUBTYPE_SINGLE;
return ME_ERRNO_SUCCESS;
}
static int me4600_ext_irq_query_subdevice_caps(me_subdevice_t *subdevice,
int *caps)
{
PDEBUG("executed.\n");
*caps =
ME_CAPS_EXT_IRQ_EDGE_RISING | ME_CAPS_EXT_IRQ_EDGE_FALLING |
ME_CAPS_EXT_IRQ_EDGE_ANY;
return ME_ERRNO_SUCCESS;
}
static irqreturn_t me4600_ext_irq_isr(int irq, void *dev_id)
{
me4600_ext_irq_subdevice_t *instance;
uint32_t ctrl;
uint32_t irq_status;
instance = (me4600_ext_irq_subdevice_t *) dev_id;
if (irq != instance->irq) {
PERROR("Incorrect interrupt num: %d.\n", irq);
return IRQ_NONE;
}
irq_status = inl(instance->irq_status_reg);
if (!(irq_status & ME4600_IRQ_STATUS_BIT_EX)) {
PINFO("%ld Shared interrupt. %s(): irq_status_reg=0x%04X\n",
jiffies, __func__, irq_status);
return IRQ_NONE;
}
PDEBUG("executed.\n");
spin_lock(&instance->subdevice_lock);
instance->rised = 1;
instance->value = inl(instance->ext_irq_value_reg);
instance->count++;
spin_lock(instance->ctrl_reg_lock);
ctrl = inl(instance->ctrl_reg);
ctrl |= ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
outl(ctrl, instance->ctrl_reg);
PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
instance->ctrl_reg - instance->reg_base, ctrl);
ctrl &= ~ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
outl(ctrl, instance->ctrl_reg);
PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
instance->ctrl_reg - instance->reg_base, ctrl);
spin_unlock(instance->ctrl_reg_lock);
spin_unlock(&instance->subdevice_lock);
wake_up_interruptible_all(&instance->wait_queue);
return IRQ_HANDLED;
}
me4600_ext_irq_subdevice_t *me4600_ext_irq_constructor(uint32_t reg_base,
int irq,
spinlock_t *
ctrl_reg_lock)
{
me4600_ext_irq_subdevice_t *subdevice;
int err;
PDEBUG("executed.\n");
/* Allocate memory for subdevice instance */
subdevice = kmalloc(sizeof(me4600_ext_irq_subdevice_t), GFP_KERNEL);
if (!subdevice) {
PERROR("Cannot get memory for subdevice instance.\n");
return NULL;
}
memset(subdevice, 0, sizeof(me4600_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->ctrl_reg_lock = ctrl_reg_lock;
/* Initialize wait queue */
init_waitqueue_head(&subdevice->wait_queue);
/* Register interrupt */
subdevice->irq = irq;
if (request_irq(subdevice->irq, me4600_ext_irq_isr,
IRQF_DISABLED | IRQF_SHARED,
ME4600_NAME, subdevice)) {
PERROR("Cannot register interrupt.\n");
kfree(subdevice);
return NULL;
}
PINFO("Registered irq=%d.\n", subdevice->irq);
/* Initialize registers */
subdevice->irq_status_reg = reg_base + ME4600_IRQ_STATUS_REG;
subdevice->ctrl_reg = reg_base + ME4600_AI_CTRL_REG;
subdevice->ext_irq_config_reg = reg_base + ME4600_EXT_IRQ_CONFIG_REG;
subdevice->ext_irq_value_reg = reg_base + ME4600_EXT_IRQ_VALUE_REG;
#ifdef MEDEBUG_DEBUG_REG
subdevice->reg_base = reg_base;
#endif
/* Override base class methods. */
subdevice->base.me_subdevice_destructor = me4600_ext_irq_destructor;
subdevice->base.me_subdevice_io_reset_subdevice =
me4600_ext_irq_io_reset_subdevice;
subdevice->base.me_subdevice_io_irq_start = me4600_ext_irq_io_irq_start;
subdevice->base.me_subdevice_io_irq_wait = me4600_ext_irq_io_irq_wait;
subdevice->base.me_subdevice_io_irq_stop = me4600_ext_irq_io_irq_stop;
subdevice->base.me_subdevice_query_number_channels =
me4600_ext_irq_query_number_channels;
subdevice->base.me_subdevice_query_subdevice_type =
me4600_ext_irq_query_subdevice_type;
subdevice->base.me_subdevice_query_subdevice_caps =
me4600_ext_irq_query_subdevice_caps;
subdevice->rised = 0;
subdevice->count = 0;
return subdevice;
}
