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 000000000000..adc1e1babf40
--- /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, __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;
+}