+// SPDX-License-Identifier: GPL-2.0
/*
* FPGA Bridge Framework Driver
*
* Copyright (C) 2013-2016 Altera Corporation, All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ * Copyright (C) 2017 Intel Corporation
*/
#include <linux/fpga/fpga-bridge.h>
#include <linux/idr.h>
}
EXPORT_SYMBOL_GPL(fpga_bridge_disable);
-/**
- * of_fpga_bridge_get - get an exclusive reference to a fpga bridge
- *
- * @np: node pointer of a FPGA bridge
- * @info: fpga image specific information
- *
- * Return fpga_bridge struct if successful.
- * Return -EBUSY if someone already has a reference to the bridge.
- * Return -ENODEV if @np is not a FPGA Bridge.
- */
-struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
- struct fpga_image_info *info)
-
+static struct fpga_bridge *__fpga_bridge_get(struct device *dev,
+ struct fpga_image_info *info)
{
- struct device *dev;
struct fpga_bridge *bridge;
int ret = -ENODEV;
- dev = class_find_device(fpga_bridge_class, NULL, np,
- fpga_bridge_of_node_match);
- if (!dev)
- goto err_dev;
-
bridge = to_fpga_bridge(dev);
- if (!bridge)
- goto err_dev;
bridge->info = info;
put_device(dev);
return ERR_PTR(ret);
}
+
+/**
+ * of_fpga_bridge_get - get an exclusive reference to a fpga bridge
+ *
+ * @np: node pointer of a FPGA bridge
+ * @info: fpga image specific information
+ *
+ * Return fpga_bridge struct if successful.
+ * Return -EBUSY if someone already has a reference to the bridge.
+ * Return -ENODEV if @np is not a FPGA Bridge.
+ */
+struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
+ struct fpga_image_info *info)
+{
+ struct device *dev;
+
+ dev = class_find_device(fpga_bridge_class, NULL, np,
+ fpga_bridge_of_node_match);
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+
+ return __fpga_bridge_get(dev, info);
+}
EXPORT_SYMBOL_GPL(of_fpga_bridge_get);
+static int fpga_bridge_dev_match(struct device *dev, const void *data)
+{
+ return dev->parent == data;
+}
+
+/**
+ * fpga_bridge_get - get an exclusive reference to a fpga bridge
+ * @dev: parent device that fpga bridge was registered with
+ * @info: fpga manager info
+ *
+ * Given a device, get an exclusive reference to a fpga bridge.
+ *
+ * Return: fpga manager struct or IS_ERR() condition containing error code.
+ */
+struct fpga_bridge *fpga_bridge_get(struct device *dev,
+ struct fpga_image_info *info)
+{
+ struct device *bridge_dev;
+
+ bridge_dev = class_find_device(fpga_bridge_class, NULL, dev,
+ fpga_bridge_dev_match);
+ if (!bridge_dev)
+ return ERR_PTR(-ENODEV);
+
+ return __fpga_bridge_get(bridge_dev, info);
+}
+EXPORT_SYMBOL_GPL(fpga_bridge_get);
+
/**
* fpga_bridge_put - release a reference to a bridge
*
EXPORT_SYMBOL_GPL(fpga_bridges_put);
/**
- * fpga_bridges_get_to_list - get a bridge, add it to a list
+ * of_fpga_bridge_get_to_list - get a bridge, add it to a list
*
* @np: node pointer of a FPGA bridge
* @info: fpga image specific information
*
* Return 0 for success, error code from of_fpga_bridge_get() othewise.
*/
-int fpga_bridge_get_to_list(struct device_node *np,
+int of_fpga_bridge_get_to_list(struct device_node *np,
+ struct fpga_image_info *info,
+ struct list_head *bridge_list)
+{
+ struct fpga_bridge *bridge;
+ unsigned long flags;
+
+ bridge = of_fpga_bridge_get(np, info);
+ if (IS_ERR(bridge))
+ return PTR_ERR(bridge);
+
+ spin_lock_irqsave(&bridge_list_lock, flags);
+ list_add(&bridge->node, bridge_list);
+ spin_unlock_irqrestore(&bridge_list_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_fpga_bridge_get_to_list);
+
+/**
+ * fpga_bridge_get_to_list - given device, get a bridge, add it to a list
+ *
+ * @dev: FPGA bridge device
+ * @info: fpga image specific information
+ * @bridge_list: list of FPGA bridges
+ *
+ * Get an exclusive reference to the bridge and and it to the list.
+ *
+ * Return 0 for success, error code from fpga_bridge_get() othewise.
+ */
+int fpga_bridge_get_to_list(struct device *dev,
struct fpga_image_info *info,
struct list_head *bridge_list)
{
struct fpga_bridge *bridge;
unsigned long flags;
- bridge = of_fpga_bridge_get(np, info);
+ bridge = fpga_bridge_get(dev, info);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
ATTRIBUTE_GROUPS(fpga_bridge);
/**
- * fpga_bridge_register - register a fpga bridge driver
+ * fpga_bridge_create - create and initialize a struct fpga_bridge
* @dev: FPGA bridge device from pdev
* @name: FPGA bridge name
* @br_ops: pointer to structure of fpga bridge ops
* @priv: FPGA bridge private data
*
- * Return: 0 for success, error code otherwise.
+ * Return: struct fpga_bridge or NULL
*/
-int fpga_bridge_register(struct device *dev, const char *name,
- const struct fpga_bridge_ops *br_ops, void *priv)
+struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name,
+ const struct fpga_bridge_ops *br_ops,
+ void *priv)
{
struct fpga_bridge *bridge;
int id, ret = 0;
if (!name || !strlen(name)) {
dev_err(dev, "Attempt to register with no name!\n");
- return -EINVAL;
+ return NULL;
}
bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
- return -ENOMEM;
+ return NULL;
id = ida_simple_get(&fpga_bridge_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
bridge->priv = priv;
device_initialize(&bridge->dev);
+ bridge->dev.groups = br_ops->groups;
bridge->dev.class = fpga_bridge_class;
bridge->dev.parent = dev;
bridge->dev.of_node = dev->of_node;
bridge->dev.id = id;
- dev_set_drvdata(dev, bridge);
ret = dev_set_name(&bridge->dev, "br%d", id);
if (ret)
goto error_device;
- ret = device_add(&bridge->dev);
- if (ret)
- goto error_device;
-
- of_platform_populate(dev->of_node, NULL, NULL, dev);
-
- dev_info(bridge->dev.parent, "fpga bridge [%s] registered\n",
- bridge->name);
-
- return 0;
+ return bridge;
error_device:
ida_simple_remove(&fpga_bridge_ida, id);
error_kfree:
kfree(bridge);
- return ret;
+ return NULL;
}
-EXPORT_SYMBOL_GPL(fpga_bridge_register);
+EXPORT_SYMBOL_GPL(fpga_bridge_create);
+
+/**
+ * fpga_bridge_free - free a fpga bridge and its id
+ * @bridge: FPGA bridge struct created by fpga_bridge_create
+ */
+void fpga_bridge_free(struct fpga_bridge *bridge)
+{
+ ida_simple_remove(&fpga_bridge_ida, bridge->dev.id);
+ kfree(bridge);
+}
+EXPORT_SYMBOL_GPL(fpga_bridge_free);
/**
- * fpga_bridge_unregister - unregister a fpga bridge driver
- * @dev: FPGA bridge device from pdev
+ * fpga_bridge_register - register a fpga bridge
+ * @bridge: FPGA bridge struct created by fpga_bridge_create
+ *
+ * Return: 0 for success, error code otherwise.
*/
-void fpga_bridge_unregister(struct device *dev)
+int fpga_bridge_register(struct fpga_bridge *bridge)
{
- struct fpga_bridge *bridge = dev_get_drvdata(dev);
+ struct device *dev = &bridge->dev;
+ int ret;
+ ret = device_add(dev);
+ if (ret)
+ return ret;
+
+ of_platform_populate(dev->of_node, NULL, NULL, dev);
+
+ dev_info(dev->parent, "fpga bridge [%s] registered\n", bridge->name);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fpga_bridge_register);
+
+/**
+ * fpga_bridge_unregister - unregister and free a fpga bridge
+ * @bridge: FPGA bridge struct created by fpga_bridge_create
+ */
+void fpga_bridge_unregister(struct fpga_bridge *bridge)
+{
/*
* If the low level driver provides a method for putting bridge into
* a desired state upon unregister, do it.
{
struct fpga_bridge *bridge = to_fpga_bridge(dev);
- ida_simple_remove(&fpga_bridge_ida, bridge->dev.id);
- kfree(bridge);
+ fpga_bridge_free(bridge);
}
static int __init fpga_bridge_dev_init(void)
}
MODULE_DESCRIPTION("FPGA Bridge Driver");
-MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
+MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
MODULE_LICENSE("GPL v2");
subsys_initcall(fpga_bridge_dev_init);
projects / J-linux.git / blobdiff