| /** |
| * @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 <asm/io.h> |
| #include <linux/types.h> |
| #include <linux/version.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; |
| } |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) |
| static irqreturn_t me4600_ext_irq_isr(int irq, void *dev_id) |
| #else |
| static irqreturn_t me4600_ext_irq_isr(int irq, void *dev_id, |
| struct pt_regs *regs) |
| #endif |
| { |
| 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, |
| #ifdef IRQF_DISABLED |
| IRQF_DISABLED | IRQF_SHARED, |
| #else |
| SA_INTERRUPT | SA_SHIRQ, |
| #endif |
| 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; |
| } |