1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/scsi/isci/timers.c b/drivers/scsi/isci/timers.c
new file mode 100644
index 000000000000..ca723089ee88
--- /dev/null
+++ b/drivers/scsi/isci/timers.c
@@ -0,0 +1,319 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "isci.h"
+#include "timers.h"
+
+
+/**
+ * isci_timer_list_construct() - This method contrucst the SCI Timer List
+ *    object used by the SCI Module class. The construction process involves
+ *    creating isci_timer objects and adding them to the SCI Timer List
+ *    object's list member. The number of isci_timer objects is determined by
+ *    the timer_list_size parameter.
+ * @isci_timer_list: This parameter points to the SCI Timer List object being
+ *    constructed. The calling routine is responsible for allocating the memory
+ *    for isci_timer_list and initializing the timer list_head member of
+ *    isci_timer_list.
+ * @timer_list_size: This parameter specifies the number of isci_timer objects
+ *    contained by the SCI Timer List. which this timer is to be associated.
+ *
+ * This method returns an error code indicating sucess or failure. The user
+ * should check for possible memory allocation error return otherwise, a zero
+ * indicates success.
+ */
+int isci_timer_list_construct(
+	struct isci_timer_list *isci_timer_list,
+	int timer_list_size)
+{
+	struct isci_timer *isci_timer;
+	int i;
+	int err = 0;
+
+
+	for (i = 0; i < timer_list_size; i++) {
+
+		isci_timer = kzalloc(sizeof(*isci_timer), GFP_KERNEL);
+
+		if (!isci_timer) {
+
+			err = -ENOMEM;
+			break;
+		}
+		isci_timer->used = 0;
+		isci_timer->stopped = 1;
+		isci_timer->parent = isci_timer_list;
+		list_add(&isci_timer->node, &isci_timer_list->timers);
+	}
+
+	return 0;
+
+}
+
+
+/**
+ * isci_timer_list_destroy() - This method destroys the SCI Timer List object
+ *    used by the SCI Module class. The destruction  process involves freeing
+ *    memory allocated for isci_timer objects on the SCI Timer List object's
+ *    timers list_head member. If any isci_timer objects are mark as "in use",
+ *    they are not freed and the function returns an error code of -EBUSY.
+ * @isci_timer_list: This parameter points to the SCI Timer List object being
+ *    destroyed.
+ *
+ * This method returns an error code indicating sucess or failure. The user
+ * should check for possible -EBUSY error return, in the event of one or more
+ * isci_timers still "in use", otherwise, a zero indicates success.
+ */
+int isci_timer_list_destroy(
+	struct isci_timer_list *isci_timer_list)
+{
+	struct isci_timer *timer, *tmp;
+
+	list_for_each_entry_safe(timer, tmp, &isci_timer_list->timers, node) {
+		isci_timer_free(isci_timer_list, timer);
+		list_del(&timer->node);
+		kfree(timer);
+	}
+	return 0;
+}
+
+
+
+static void isci_timer_restart(struct isci_timer *isci_timer)
+{
+	struct timer_list *timer =
+		&isci_timer->timer;
+	unsigned long timeout;
+
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	isci_timer->restart = 0;
+	isci_timer->stopped = 0;
+	timeout = isci_timer->timeout_value;
+	timeout = (timeout * HZ) / 1000;
+	timeout = timeout ? timeout : 1;
+	mod_timer(timer, jiffies + timeout);
+}
+
+/**
+ * This method pulls an isci_timer object off of the list for the SCI Timer
+ *    List object specified, marks the isci_timer as "in use" and initializes
+ *    it with user callback function and cookie data. The timer is not start at
+ *    this time, just reserved for the user.
+ * @isci_timer_list: This parameter points to the SCI Timer List from which the
+ *    timer is reserved.
+ * @cookie: This parameter specifies a piece of information that the user must
+ *    retain.  This cookie is to be supplied by the user anytime a timeout
+ *    occurs for the created timer.
+ * @timer_callback: This parameter specifies the callback method to be invoked
+ *    whenever the timer expires.
+ *
+ * This method returns a pointer to an isci_timer object reserved from the SCI
+ * Timer List.  The pointer will be utilized for all further interactions
+ * relating to this timer.
+ */
+
+static void timer_function(unsigned long data)
+{
+
+	struct isci_timer *timer     = (struct isci_timer *)data;
+	struct isci_host *isci_host = timer->isci_host;
+	unsigned long flags;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, timer);
+
+	if (isci_stopped == isci_host_get_state(isci_host)) {
+		timer->stopped = 1;
+		return;
+	}
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+	if (!timer->stopped) {
+		timer->stopped = 1;
+		timer->timer_callback(timer->cookie);
+
+		if (timer->restart)
+			isci_timer_restart(timer);
+	}
+
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+}
+
+
+struct isci_timer *isci_timer_create(
+	struct isci_timer_list *isci_timer_list,
+	struct isci_host *isci_host,
+	void *cookie,
+	void (*timer_callback)(void *))
+{
+
+	struct timer_list *timer;
+	struct isci_timer *isci_timer;
+	struct list_head *timer_list =
+		&isci_timer_list->timers;
+	unsigned long flags;
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+	if (list_empty(timer_list)) {
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+		return NULL;
+	}
+
+	isci_timer = list_entry(timer_list->next, struct isci_timer, node);
+
+	if (isci_timer->used) {
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+		return NULL;
+	}
+	isci_timer->used = 1;
+	isci_timer->stopped = 1;
+	list_move_tail(&isci_timer->node, timer_list);
+
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+	timer = &isci_timer->timer;
+	timer->data = (unsigned long)isci_timer;
+	timer->function = timer_function;
+	isci_timer->cookie = cookie;
+	isci_timer->timer_callback = timer_callback;
+	isci_timer->isci_host = isci_host;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	return isci_timer;
+}
+
+/**
+ * isci_timer_free() - This method frees the isci_timer, marking it "free to
+ *    use", then places its back at the head of the timers list for the SCI
+ *    Timer List object specified.
+ * @isci_timer_list: This parameter points to the SCI Timer List from which the
+ *    timer is reserved.
+ * @isci_timer: This parameter specifies the timer to be freed.
+ *
+ */
+void isci_timer_free(
+	struct isci_timer_list *isci_timer_list,
+	struct isci_timer *isci_timer)
+{
+	struct list_head *timer_list = &isci_timer_list->timers;
+
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	if (list_empty(timer_list))
+		return;
+
+	isci_timer->used = 0;
+	list_move(&isci_timer->node, timer_list);
+
+	if (!isci_timer->stopped) {
+		del_timer(&isci_timer->timer);
+		isci_timer->stopped = 1;
+	}
+}
+
+/**
+ * isci_timer_start() - This method starts the specified isci_timer, with the
+ *    specified timeout value.
+ * @isci_timer: This parameter specifies the timer to be started.
+ * @timeout: This parameter specifies the timeout, in milliseconds, after which
+ *    the associated callback function will be called.
+ *
+ */
+void isci_timer_start(
+	struct isci_timer *isci_timer,
+	unsigned long timeout)
+{
+	struct timer_list *timer = &isci_timer->timer;
+
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	isci_timer->timeout_value = timeout;
+	init_timer(timer);
+	timeout = (timeout * HZ) / 1000;
+	timeout = timeout ? timeout : 1;
+
+	timer->expires = jiffies + timeout;
+	timer->data = (unsigned long)isci_timer;
+	timer->function = timer_function;
+	isci_timer->stopped = 0;
+	isci_timer->restart = 0;
+	add_timer(timer);
+}
+
+/**
+ * isci_timer_stop() - This method stops the supplied isci_timer.
+ * @isci_timer: This parameter specifies the isci_timer to be stopped.
+ *
+ */
+void isci_timer_stop(struct isci_timer *isci_timer)
+{
+	dev_dbg(&isci_timer->isci_host->pdev->dev,
+		"%s: isci_timer = %p\n", __func__, isci_timer);
+
+	if (isci_timer->stopped)
+		return;
+
+	isci_timer->stopped = 1;
+
+	del_timer(&isci_timer->timer);
+}