diff options
Diffstat (limited to 'drivers/staging/meilhaus/me1400_ext_irq.c')
| -rw-r--r-- | drivers/staging/meilhaus/me1400_ext_irq.c | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/drivers/staging/meilhaus/me1400_ext_irq.c b/drivers/staging/meilhaus/me1400_ext_irq.c new file mode 100644 index 000000000000..b4df7cc58ab7 --- /dev/null +++ b/drivers/staging/meilhaus/me1400_ext_irq.c @@ -0,0 +1,517 @@ +/** + * @file me1400_ext_irq.c + * + * @brief ME-1400 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 "medebug.h" +#include "meids.h" + +#include "me1400_ext_irq.h" +#include "me1400_ext_irq_reg.h" + +/* + * Defines + */ +#define ME1400_EXT_IRQ_MAGIC_NUMBER 0x1401 /**< The magic number of the class structure. */ +#define ME1400_EXT_IRQ_NUMBER_CHANNELS 1 /**< One channel per counter. */ + +/* + * Functions + */ + +static int me1400_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) +{ + me1400_ext_irq_subdevice_t *instance; + unsigned long cpu_flags; + uint8_t tmp; + + PDEBUG("executed.\n"); + + instance = (me1400_ext_irq_subdevice_t *) subdevice; + + if (flags & ~ME_IO_IRQ_START_DIO_BIT) { + PERROR("Invalid flag specified.\n"); + return ME_ERRNO_INVALID_FLAGS; + } + + if (channel) { + PERROR("Invalid channel.\n"); + return ME_ERRNO_INVALID_CHANNEL; + } + + if (irq_source != ME_IRQ_SOURCE_DIO_LINE) { + PERROR("Invalid irq source.\n"); + return ME_ERRNO_INVALID_IRQ_SOURCE; + } + + if (irq_edge != ME_IRQ_EDGE_RISING) { + PERROR("Invalid irq edge.\n"); + return ME_ERRNO_INVALID_IRQ_EDGE; + } + + ME_SUBDEVICE_ENTER; + + spin_lock_irqsave(&instance->subdevice_lock, cpu_flags); + + spin_lock(instance->clk_src_reg_lock); +// // Enable IRQ on PLX +// tmp = inb(instance->plx_intcs_reg) | (PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL | PLX_PCI_INT_EN); +// outb(tmp, instance->plx_intcs_reg); +// PDEBUG_REG("ctrl_reg outb(PLX:0x%lX)=0x%x\n", instance->plx_intcs_reg, tmp); + + // Enable IRQ + switch (instance->device_id) { + case PCI_DEVICE_ID_MEILHAUS_ME140C: + case PCI_DEVICE_ID_MEILHAUS_ME140D: + tmp = inb(instance->ctrl_reg); + tmp |= ME1400CD_EXT_IRQ_CLK_EN; + outb(tmp, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, tmp); + break; + + default: + outb(ME1400AB_EXT_IRQ_IRQ_EN, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, + ME1400AB_EXT_IRQ_IRQ_EN); + break; + } + spin_unlock(instance->clk_src_reg_lock); + instance->rised = 0; + spin_unlock_irqrestore(&instance->subdevice_lock, cpu_flags); + + ME_SUBDEVICE_EXIT; + + return ME_ERRNO_SUCCESS; +} + +static int me1400_ext_irq_io_irq_wait(struct me_subdevice *subdevice, + struct file *filep, + int channel, + int *irq_count, + int *value, int time_out, int flags) +{ + me1400_ext_irq_subdevice_t *instance; + unsigned long cpu_flags; + long t = 0; + int err = ME_ERRNO_SUCCESS; + + PDEBUG("executed.\n"); + + instance = (me1400_ext_irq_subdevice_t *) subdevice; + + if (flags) { + PERROR("Invalid flag specified.\n"); + return ME_ERRNO_INVALID_FLAGS; + } + + if (channel) { + PERROR("Invalid channel.\n"); + return ME_ERRNO_INVALID_CHANNEL; + } + + if (time_out < 0) { + PERROR("Invalid time out.\n"); + return ME_ERRNO_INVALID_TIMEOUT; + } + + if (time_out) { + /* Convert to ticks */ + 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 me1400_ext_irq_io_irq_stop(struct me_subdevice *subdevice, + struct file *filep, + int channel, int flags) +{ + me1400_ext_irq_subdevice_t *instance; + unsigned long cpu_flags; + uint8_t tmp; + int err = ME_ERRNO_SUCCESS; + + PDEBUG("executed.\n"); + + instance = (me1400_ext_irq_subdevice_t *) subdevice; + + if (flags) { + PERROR("Invalid flag specified.\n"); + return ME_ERRNO_INVALID_FLAGS; + } + + if (channel) { + PERROR("Invalid channel.\n"); + return ME_ERRNO_INVALID_CHANNEL; + } + + ME_SUBDEVICE_ENTER; + + spin_lock_irqsave(&instance->subdevice_lock, cpu_flags); + spin_lock(instance->clk_src_reg_lock); +// // Disable IRQ on PLX +// tmp = inb(instance->plx_intcs_reg) & ( ~(PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL | PLX_PCI_INT_EN)); +// outb(tmp, instance->plx_intcs_reg); +// PDEBUG_REG("ctrl_reg outb(PLX:0x%lX)=0x%x\n", instance->plx_intcs_reg, tmp); + + switch (instance->device_id) { + case PCI_DEVICE_ID_MEILHAUS_ME140C: + case PCI_DEVICE_ID_MEILHAUS_ME140D: + tmp = inb(instance->ctrl_reg); + tmp &= ~ME1400CD_EXT_IRQ_CLK_EN; + outb(tmp, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, tmp); + + break; + + default: + outb(0x00, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outl(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, 0x00); + break; + } + spin_unlock(instance->clk_src_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 me1400_ext_irq_io_reset_subdevice(struct me_subdevice *subdevice, + struct file *filep, int flags) +{ + me1400_ext_irq_subdevice_t *instance = + (me1400_ext_irq_subdevice_t *) subdevice; + + PDEBUG("executed.\n"); + + if (flags) { + PERROR("Invalid flag specified.\n"); + return ME_ERRNO_INVALID_FLAGS; + } + + instance->n = 0; + return me1400_ext_irq_io_irq_stop(subdevice, filep, 0, flags); +} + +static int me1400_ext_irq_query_number_channels(struct me_subdevice *subdevice, + int *number) +{ + PDEBUG("executed.\n"); + *number = ME1400_EXT_IRQ_NUMBER_CHANNELS; + return ME_ERRNO_SUCCESS; +} + +static int me1400_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 me1400_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 int me1400_ext_irq_query_subdevice_caps_args(struct me_subdevice + *subdevice, int cap, + int *args, int count) +{ + PDEBUG("executed.\n"); + return ME_ERRNO_NOT_SUPPORTED; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) +static irqreturn_t me1400_ext_irq_isr(int irq, void *dev_id) +#else +static irqreturn_t me1400_ext_irq_isr(int irq, void *dev_id, + struct pt_regs *regs) +#endif +{ + me1400_ext_irq_subdevice_t *instance; + uint32_t status; + uint8_t tmp; + + instance = (me1400_ext_irq_subdevice_t *) dev_id; + + if (irq != instance->irq) { + PERROR("Incorrect interrupt num: %d.\n", irq); + return IRQ_NONE; + } + + spin_lock(&instance->subdevice_lock); + status = inl(instance->plx_intcs_reg); +// if (!((status & PLX_LOCAL_INT1_STATE) && (status & PLX_LOCAL_INT1_EN) && (status & PLX_PCI_INT_EN))) + if ((status & + (PLX_LOCAL_INT1_STATE | PLX_LOCAL_INT1_EN | PLX_PCI_INT_EN)) != + (PLX_LOCAL_INT1_STATE | PLX_LOCAL_INT1_EN | PLX_PCI_INT_EN)) { + spin_unlock(&instance->subdevice_lock); + PINFO("%ld Shared interrupt. %s(): irq_status_reg=0x%04X\n", + jiffies, __func__, status); + return IRQ_NONE; + } + + inl(instance->ctrl_reg); + + PDEBUG("executed.\n"); + + instance->n++; + instance->rised = 1; + + switch (instance->device_id) { + + case PCI_DEVICE_ID_MEILHAUS_ME140C: + case PCI_DEVICE_ID_MEILHAUS_ME140D: + spin_lock(instance->clk_src_reg_lock); + tmp = inb(instance->ctrl_reg); + tmp &= ~ME1400CD_EXT_IRQ_CLK_EN; + outb(tmp, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, tmp); + tmp |= ME1400CD_EXT_IRQ_CLK_EN; + outb(tmp, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, tmp); + spin_unlock(instance->clk_src_reg_lock); + + break; + + default: + outb(0, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, 0); + outb(ME1400AB_EXT_IRQ_IRQ_EN, instance->ctrl_reg); + PDEBUG_REG("ctrl_reg outb(0x%lX+0x%lX)=0x%x\n", + instance->reg_base, + instance->ctrl_reg - instance->reg_base, + ME1400AB_EXT_IRQ_IRQ_EN); + break; + } + + spin_unlock(&instance->subdevice_lock); + wake_up_interruptible_all(&instance->wait_queue); + + return IRQ_HANDLED; +} + +static void me1400_ext_irq_destructor(struct me_subdevice *subdevice) +{ + me1400_ext_irq_subdevice_t *instance; + uint8_t tmp; + + PDEBUG("executed.\n"); + + instance = (me1400_ext_irq_subdevice_t *) subdevice; + + // Disable IRQ on PLX + tmp = + inb(instance-> + plx_intcs_reg) & (~(PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL | + PLX_PCI_INT_EN)); + outb(tmp, instance->plx_intcs_reg); + PDEBUG_REG("ctrl_reg outb(plx:0x%lX)=0x%x\n", instance->plx_intcs_reg, + tmp); + + free_irq(instance->irq, (void *)instance); + me_subdevice_deinit(&instance->base); + kfree(instance); +} + +me1400_ext_irq_subdevice_t *me1400_ext_irq_constructor(uint32_t device_id, + uint32_t plx_reg_base, + uint32_t me1400_reg_base, + spinlock_t * + clk_src_reg_lock, + int irq) +{ + me1400_ext_irq_subdevice_t *subdevice; + int err; + uint8_t tmp; + + PDEBUG("executed.\n"); + + /* Allocate memory for subdevice instance */ + subdevice = kmalloc(sizeof(me1400_ext_irq_subdevice_t), GFP_KERNEL); + + if (!subdevice) { + PERROR("Cannot get memory for 1400_ext_irq instance.\n"); + return NULL; + } + + memset(subdevice, 0, sizeof(me1400_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->clk_src_reg_lock = clk_src_reg_lock; + + /* Initialize wait queue */ + init_waitqueue_head(&subdevice->wait_queue); + + subdevice->irq = irq; + + err = request_irq(irq, me1400_ext_irq_isr, +#ifdef IRQF_DISABLED + IRQF_DISABLED | IRQF_SHARED, +#else + SA_INTERRUPT | SA_SHIRQ, +#endif + ME1400_NAME, (void *)subdevice); + + if (err) { + PERROR("Can't get irq.\n"); + me_subdevice_deinit(&subdevice->base); + kfree(subdevice); + return NULL; + } + PINFO("Registered irq=%d.\n", subdevice->irq); + + /* Initialize registers */ + subdevice->plx_intcs_reg = plx_reg_base + PLX_INTCSR_REG; + subdevice->ctrl_reg = me1400_reg_base + ME1400AB_EXT_IRQ_CTRL_REG; +#ifdef MEDEBUG_DEBUG_REG + subdevice->reg_base = me1400_reg_base; +#endif + + // Enable IRQ on PLX + tmp = + inb(subdevice-> + plx_intcs_reg) | (PLX_LOCAL_INT1_EN | PLX_LOCAL_INT1_POL | + PLX_PCI_INT_EN); + outb(tmp, subdevice->plx_intcs_reg); + PDEBUG_REG("ctrl_reg outb(Pplx:0x%lX)=0x%x\n", subdevice->plx_intcs_reg, + tmp); + + /* Initialize the subdevice methods */ + subdevice->base.me_subdevice_io_irq_start = me1400_ext_irq_io_irq_start; + subdevice->base.me_subdevice_io_irq_wait = me1400_ext_irq_io_irq_wait; + subdevice->base.me_subdevice_io_irq_stop = me1400_ext_irq_io_irq_stop; + subdevice->base.me_subdevice_io_reset_subdevice = + me1400_ext_irq_io_reset_subdevice; + subdevice->base.me_subdevice_query_number_channels = + me1400_ext_irq_query_number_channels; + subdevice->base.me_subdevice_query_subdevice_type = + me1400_ext_irq_query_subdevice_type; + subdevice->base.me_subdevice_query_subdevice_caps = + me1400_ext_irq_query_subdevice_caps; + subdevice->base.me_subdevice_query_subdevice_caps_args = + me1400_ext_irq_query_subdevice_caps_args; + subdevice->base.me_subdevice_destructor = me1400_ext_irq_destructor; + + subdevice->rised = 0; + subdevice->n = 0; + + return subdevice; +} |