diff options
Diffstat (limited to 'drivers/staging/meilhaus/me0600_ext_irq.c')
-rw-r--r-- | drivers/staging/meilhaus/me0600_ext_irq.c | 478 |
1 files changed, 478 insertions, 0 deletions
diff --git a/drivers/staging/meilhaus/me0600_ext_irq.c b/drivers/staging/meilhaus/me0600_ext_irq.c new file mode 100644 index 0000000..a449ab2 --- /dev/null +++ b/drivers/staging/meilhaus/me0600_ext_irq.c @@ -0,0 +1,478 @@ +/** + * @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", + __FUNCTION__, 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, __FUNCTION__, 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; +} |