![Alexander Beregalov](/assets/img/avatar_default.png)
Cc: David Kiliani <mail@davidkiliani.de> Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
463 lines
12 KiB
C
463 lines
12 KiB
C
/**
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* @file me4600_ext_irq.c
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*
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* @brief ME-4000 external interrupt subdevice instance.
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* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
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* @author Guenter Gebhardt
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* @author Krzysztof Gantzke (k.gantzke@meilhaus.de)
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*/
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/*
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* Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __KERNEL__
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# define __KERNEL__
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#endif
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/*
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* Includes
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/types.h>
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#include <linux/version.h>
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#include "medefines.h"
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#include "meinternal.h"
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#include "meerror.h"
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#include "medebug.h"
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#include "meids.h"
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#include "me4600_reg.h"
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#include "me4600_ai_reg.h"
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#include "me4600_ext_irq_reg.h"
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#include "me4600_ext_irq.h"
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/*
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* Defines
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*/
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/*
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* Functions
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*/
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static int me4600_ext_irq_io_irq_start(me_subdevice_t *subdevice,
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struct file *filep,
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int channel,
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int irq_source,
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int irq_edge, int irq_arg, int flags)
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{
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me4600_ext_irq_subdevice_t *instance;
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int err = ME_ERRNO_SUCCESS;
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unsigned long cpu_flags;
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uint32_t tmp;
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PDEBUG("executed.\n");
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instance = (me4600_ext_irq_subdevice_t *) subdevice;
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if (flags & ~ME_IO_IRQ_START_DIO_BIT) {
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PERROR("Invalid flag specified.\n");
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return ME_ERRNO_INVALID_FLAGS;
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}
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if ((irq_edge != ME_IRQ_EDGE_RISING)
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&& (irq_edge != ME_IRQ_EDGE_FALLING)
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&& (irq_edge != ME_IRQ_EDGE_ANY)
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) {
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PERROR("Invalid irq edge specified.\n");
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return ME_ERRNO_INVALID_IRQ_EDGE;
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}
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if (irq_source != ME_IRQ_SOURCE_DIO_LINE) {
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PERROR("Invalid irq source specified.\n");
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return ME_ERRNO_INVALID_IRQ_SOURCE;
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}
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if (channel) {
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PERROR("Invalid channel specified.\n");
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return ME_ERRNO_INVALID_CHANNEL;
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}
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ME_SUBDEVICE_ENTER;
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spin_lock(&instance->subdevice_lock);
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tmp = 0x0; //inl(instance->ext_irq_config_reg);
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if (irq_edge == ME_IRQ_EDGE_RISING) {
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//tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
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//tmp |= ME4600_EXT_IRQ_CONFIG_MASK_RISING;
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} else if (irq_edge == ME_IRQ_EDGE_FALLING) {
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//tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
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//tmp |= ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
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tmp = ME4600_EXT_IRQ_CONFIG_MASK_FALLING;
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} else if (irq_edge == ME_IRQ_EDGE_ANY) {
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//tmp &= ~ME4600_EXT_IRQ_CONFIG_MASK;
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//tmp |= ME4600_EXT_IRQ_CONFIG_MASK_ANY;
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tmp = ME4600_EXT_IRQ_CONFIG_MASK_ANY;
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}
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outl(tmp, instance->ext_irq_config_reg);
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PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
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instance->reg_base,
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instance->ext_irq_config_reg - instance->reg_base, tmp);
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spin_lock_irqsave(instance->ctrl_reg_lock, cpu_flags);
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tmp = inl(instance->ctrl_reg);
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tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
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tmp |= ME4600_AI_CTRL_BIT_EX_IRQ;
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outl(tmp, instance->ctrl_reg);
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spin_unlock_irqrestore(instance->ctrl_reg_lock, cpu_flags);
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instance->rised = 0;
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spin_unlock(&instance->subdevice_lock);
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ME_SUBDEVICE_EXIT;
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return err;
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}
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static int me4600_ext_irq_io_irq_wait(me_subdevice_t *subdevice,
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struct file *filep,
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int channel,
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int *irq_count,
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int *value, int time_out, int flags)
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{
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me4600_ext_irq_subdevice_t *instance;
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int err = ME_ERRNO_SUCCESS;
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long t = 0;
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unsigned long cpu_flags;
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PDEBUG("executed.\n");
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instance = (me4600_ext_irq_subdevice_t *) subdevice;
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if (flags) {
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PERROR("Invalid flag specified.\n");
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return ME_ERRNO_INVALID_FLAGS;
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}
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if (channel) {
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PERROR("Invalid channel specified.\n");
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return ME_ERRNO_INVALID_CHANNEL;
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}
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if (time_out < 0) {
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PERROR("Invalid time_out specified.\n");
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return ME_ERRNO_INVALID_TIMEOUT;
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}
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if (time_out) {
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t = (time_out * HZ) / 1000;
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if (t == 0)
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t = 1;
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}
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ME_SUBDEVICE_ENTER;
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if (instance->rised <= 0) {
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instance->rised = 0;
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if (time_out) {
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t = wait_event_interruptible_timeout(instance->
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wait_queue,
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(instance->rised !=
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0), t);
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if (t == 0) {
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PERROR
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("Wait on external interrupt timed out.\n");
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err = ME_ERRNO_TIMEOUT;
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}
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} else {
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wait_event_interruptible(instance->wait_queue,
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(instance->rised != 0));
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}
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if (instance->rised < 0) {
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PERROR("Wait on interrupt aborted by user.\n");
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err = ME_ERRNO_CANCELLED;
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}
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}
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if (signal_pending(current)) {
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PERROR("Wait on external interrupt aborted by signal.\n");
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err = ME_ERRNO_SIGNAL;
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}
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spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
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instance->rised = 0;
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*irq_count = instance->count;
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*value = instance->value;
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spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
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ME_SUBDEVICE_EXIT;
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return err;
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}
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static int me4600_ext_irq_io_irq_stop(me_subdevice_t *subdevice,
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struct file *filep,
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int channel, int flags)
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{
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me4600_ext_irq_subdevice_t *instance;
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int err = ME_ERRNO_SUCCESS;
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unsigned long cpu_flags;
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uint32_t tmp;
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PDEBUG("executed.\n");
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instance = (me4600_ext_irq_subdevice_t *) subdevice;
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if (flags) {
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PERROR("Invalid flag specified.\n");
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return ME_ERRNO_INVALID_FLAGS;
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}
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if (channel) {
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PERROR("Invalid channel specified.\n");
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return ME_ERRNO_INVALID_CHANNEL;
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}
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ME_SUBDEVICE_ENTER;
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spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
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spin_lock(instance->ctrl_reg_lock);
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tmp = inl(instance->ctrl_reg);
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tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
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outl(tmp, instance->ctrl_reg);
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PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
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instance->ctrl_reg - instance->reg_base, tmp);
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spin_unlock(instance->ctrl_reg_lock);
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instance->rised = -1;
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spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
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wake_up_interruptible_all(&instance->wait_queue);
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ME_SUBDEVICE_EXIT;
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return err;
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}
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static int me4600_ext_irq_io_reset_subdevice(me_subdevice_t *subdevice,
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struct file *filep, int flags)
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{
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me4600_ext_irq_subdevice_t *instance;
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unsigned long cpu_flags;
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uint32_t tmp;
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PDEBUG("executed.\n");
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instance = (me4600_ext_irq_subdevice_t *) subdevice;
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if (flags) {
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PERROR("Invalid flag specified.\n");
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return ME_ERRNO_INVALID_FLAGS;
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}
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ME_SUBDEVICE_ENTER;
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spin_lock_irqsave(&instance->subdevice_lock, cpu_flags);
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spin_lock(instance->ctrl_reg_lock);
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tmp = inl(instance->ctrl_reg);
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tmp &= ~(ME4600_AI_CTRL_BIT_EX_IRQ | ME4600_AI_CTRL_BIT_EX_IRQ_RESET);
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outl(tmp, instance->ctrl_reg);
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PDEBUG_REG("ctrl_regv outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
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instance->ctrl_reg - instance->reg_base, tmp);
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spin_unlock(instance->ctrl_reg_lock);
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instance->rised = -1;
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instance->count = 0;
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outl(ME4600_EXT_IRQ_CONFIG_MASK_ANY, instance->ext_irq_config_reg);
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PDEBUG_REG("ext_irq_config_reg outl(0x%lX+0x%lX)=0x%x\n",
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instance->reg_base,
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instance->ext_irq_config_reg - instance->reg_base,
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ME4600_EXT_IRQ_CONFIG_MASK_ANY);
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spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags);
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wake_up_interruptible_all(&instance->wait_queue);
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ME_SUBDEVICE_EXIT;
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return ME_ERRNO_SUCCESS;
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}
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static void me4600_ext_irq_destructor(struct me_subdevice *subdevice)
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{
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me4600_ext_irq_subdevice_t *instance;
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PDEBUG("executed.\n");
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instance = (me4600_ext_irq_subdevice_t *) subdevice;
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me_subdevice_deinit(&instance->base);
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free_irq(instance->irq, instance);
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kfree(instance);
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}
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static int me4600_ext_irq_query_number_channels(me_subdevice_t *subdevice,
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int *number)
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{
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PDEBUG("executed.\n");
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*number = 1;
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return ME_ERRNO_SUCCESS;
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}
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static int me4600_ext_irq_query_subdevice_type(me_subdevice_t *subdevice,
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int *type, int *subtype)
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{
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PDEBUG("executed.\n");
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*type = ME_TYPE_EXT_IRQ;
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*subtype = ME_SUBTYPE_SINGLE;
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return ME_ERRNO_SUCCESS;
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}
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static int me4600_ext_irq_query_subdevice_caps(me_subdevice_t *subdevice,
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int *caps)
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{
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PDEBUG("executed.\n");
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*caps =
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ME_CAPS_EXT_IRQ_EDGE_RISING | ME_CAPS_EXT_IRQ_EDGE_FALLING |
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ME_CAPS_EXT_IRQ_EDGE_ANY;
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return ME_ERRNO_SUCCESS;
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}
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static irqreturn_t me4600_ext_irq_isr(int irq, void *dev_id)
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{
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me4600_ext_irq_subdevice_t *instance;
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uint32_t ctrl;
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uint32_t irq_status;
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instance = (me4600_ext_irq_subdevice_t *) dev_id;
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if (irq != instance->irq) {
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PERROR("Incorrect interrupt num: %d.\n", irq);
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return IRQ_NONE;
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}
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irq_status = inl(instance->irq_status_reg);
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if (!(irq_status & ME4600_IRQ_STATUS_BIT_EX)) {
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PINFO("%ld Shared interrupt. %s(): irq_status_reg=0x%04X\n",
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jiffies, __func__, irq_status);
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return IRQ_NONE;
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}
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PDEBUG("executed.\n");
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spin_lock(&instance->subdevice_lock);
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instance->rised = 1;
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instance->value = inl(instance->ext_irq_value_reg);
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instance->count++;
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spin_lock(instance->ctrl_reg_lock);
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ctrl = inl(instance->ctrl_reg);
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ctrl |= ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
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outl(ctrl, instance->ctrl_reg);
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PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
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instance->ctrl_reg - instance->reg_base, ctrl);
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ctrl &= ~ME4600_AI_CTRL_BIT_EX_IRQ_RESET;
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outl(ctrl, instance->ctrl_reg);
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PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", instance->reg_base,
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instance->ctrl_reg - instance->reg_base, ctrl);
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spin_unlock(instance->ctrl_reg_lock);
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spin_unlock(&instance->subdevice_lock);
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wake_up_interruptible_all(&instance->wait_queue);
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return IRQ_HANDLED;
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}
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me4600_ext_irq_subdevice_t *me4600_ext_irq_constructor(uint32_t reg_base,
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int irq,
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spinlock_t *
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ctrl_reg_lock)
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{
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me4600_ext_irq_subdevice_t *subdevice;
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int err;
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PDEBUG("executed.\n");
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/* Allocate memory for subdevice instance */
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subdevice = kmalloc(sizeof(me4600_ext_irq_subdevice_t), GFP_KERNEL);
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if (!subdevice) {
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PERROR("Cannot get memory for subdevice instance.\n");
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return NULL;
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}
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memset(subdevice, 0, sizeof(me4600_ext_irq_subdevice_t));
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/* Initialize subdevice base class */
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err = me_subdevice_init(&subdevice->base);
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if (err) {
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PERROR("Cannot initialize subdevice base class instance.\n");
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kfree(subdevice);
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return NULL;
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}
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// Initialize spin locks.
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spin_lock_init(&subdevice->subdevice_lock);
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subdevice->ctrl_reg_lock = ctrl_reg_lock;
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/* Initialize wait queue */
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init_waitqueue_head(&subdevice->wait_queue);
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/* Register interrupt */
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subdevice->irq = irq;
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if (request_irq(subdevice->irq, me4600_ext_irq_isr,
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#ifdef IRQF_DISABLED
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IRQF_DISABLED | IRQF_SHARED,
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#else
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SA_INTERRUPT | SA_SHIRQ,
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#endif
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ME4600_NAME, subdevice)) {
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PERROR("Cannot register interrupt.\n");
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kfree(subdevice);
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return NULL;
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}
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PINFO("Registered irq=%d.\n", subdevice->irq);
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/* Initialize registers */
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subdevice->irq_status_reg = reg_base + ME4600_IRQ_STATUS_REG;
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subdevice->ctrl_reg = reg_base + ME4600_AI_CTRL_REG;
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subdevice->ext_irq_config_reg = reg_base + ME4600_EXT_IRQ_CONFIG_REG;
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subdevice->ext_irq_value_reg = reg_base + ME4600_EXT_IRQ_VALUE_REG;
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#ifdef MEDEBUG_DEBUG_REG
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subdevice->reg_base = reg_base;
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#endif
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/* Override base class methods. */
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subdevice->base.me_subdevice_destructor = me4600_ext_irq_destructor;
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subdevice->base.me_subdevice_io_reset_subdevice =
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me4600_ext_irq_io_reset_subdevice;
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subdevice->base.me_subdevice_io_irq_start = me4600_ext_irq_io_irq_start;
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subdevice->base.me_subdevice_io_irq_wait = me4600_ext_irq_io_irq_wait;
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subdevice->base.me_subdevice_io_irq_stop = me4600_ext_irq_io_irq_stop;
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subdevice->base.me_subdevice_query_number_channels =
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me4600_ext_irq_query_number_channels;
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subdevice->base.me_subdevice_query_subdevice_type =
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me4600_ext_irq_query_subdevice_type;
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subdevice->base.me_subdevice_query_subdevice_caps =
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me4600_ext_irq_query_subdevice_caps;
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subdevice->rised = 0;
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subdevice->count = 0;
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return subdevice;
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}
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