| /** |
| * @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/version.h> |
| #include <linux/module.h> |
| |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <asm/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); |
| } |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) |
| static irqreturn_t me0600_isr(int irq, void *dev_id) |
| #else |
| static irqreturn_t me0600_isr(int irq, void *dev_id, struct pt_regs *regs) |
| #endif |
| { |
| 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, |
| #ifdef IRQF_DISABLED |
| IRQF_DISABLED | IRQF_SHARED, |
| #else |
| SA_INTERRUPT | SA_SHIRQ, |
| #endif |
| 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; |
| } |