diff options
Diffstat (limited to 'drivers/staging/meilhaus/me4600_ext_irq.c')
-rw-r--r-- | drivers/staging/meilhaus/me4600_ext_irq.c | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/staging/meilhaus/me4600_ext_irq.c b/drivers/staging/meilhaus/me4600_ext_irq.c new file mode 100644 index 0000000..8a10dce --- /dev/null +++ b/drivers/staging/meilhaus/me4600_ext_irq.c @@ -0,0 +1,467 @@ +/** + * @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, __FUNCTION__, 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; +} |