drivers/fpga/fpga-bridge.c

8 #include <linux/fpga/fpga-bridge.h>
23  * fpga_bridge_enable - Enable transactions on the bridge
25  * @bridge: FPGA bridge
29 int fpga_bridge_enable(struct fpga_bridge *bridge)
31 	dev_dbg(&bridge->dev, "enable\n");
33 	if (bridge->br_ops->enable_set)
34 		return bridge->br_ops->enable_set(bridge, 1);
41  * fpga_bridge_disable - Disable transactions on the bridge
43  * @bridge: FPGA bridge
47 int fpga_bridge_disable(struct fpga_bridge *bridge)
49 	dev_dbg(&bridge->dev, "disable\n");
51 	if (bridge->br_ops->enable_set)
52 		return bridge->br_ops->enable_set(bridge, 0);
61 	struct fpga_bridge *bridge;
64 	bridge = to_fpga_bridge(dev);
66 	bridge->info = info;
68 	if (!mutex_trylock(&bridge->mutex)) {
76 	dev_dbg(&bridge->dev, "get\n");
78 	return bridge;
81 	mutex_unlock(&bridge->mutex);
88  * of_fpga_bridge_get - get an exclusive reference to an fpga bridge
90  * @np: node pointer of an FPGA bridge.
95  * * -EBUSY if someone already has a reference to the bridge.
117  * fpga_bridge_get - get an exclusive reference to an fpga bridge
118  * @dev:	parent device that fpga bridge was registered with
121  * Given a device, get an exclusive reference to an fpga bridge.
123  * Return: fpga bridge struct or IS_ERR() condition containing error code.
140  * fpga_bridge_put - release a reference to a bridge
142  * @bridge: FPGA bridge
144 void fpga_bridge_put(struct fpga_bridge *bridge)
146 	dev_dbg(&bridge->dev, "put\n");
148 	bridge->info = NULL;
149 	module_put(bridge->dev.parent->driver->owner);
150 	mutex_unlock(&bridge->mutex);
151 	put_device(&bridge->dev);
159  * Enable each bridge in the list. If list is empty, do nothing.
161  * Return: 0 for success or empty bridge list or an error code otherwise.
165 	struct fpga_bridge *bridge;
168 	list_for_each_entry(bridge, bridge_list, node) {
169 		ret = fpga_bridge_enable(bridge);
183  * Disable each bridge in the list. If list is empty, do nothing.
185  * Return: 0 for success or empty bridge list or an error code otherwise.
189 	struct fpga_bridge *bridge;
192 	list_for_each_entry(bridge, bridge_list, node) {
193 		ret = fpga_bridge_disable(bridge);
207  * For each bridge in the list, put the bridge and remove it from the list.
212 	struct fpga_bridge *bridge, *next;
215 	list_for_each_entry_safe(bridge, next, bridge_list, node) {
216 		fpga_bridge_put(bridge);
219 		list_del(&bridge->node);
226  * of_fpga_bridge_get_to_list - get a bridge, add it to a list
228  * @np: node pointer of an FPGA bridge
232  * Get an exclusive reference to the bridge and it to the list.
240 	struct fpga_bridge *bridge;
243 	bridge = of_fpga_bridge_get(np, info);
244 	if (IS_ERR(bridge))
245 		return PTR_ERR(bridge);
248 	list_add(&bridge->node, bridge_list);
256  * fpga_bridge_get_to_list - given device, get a bridge, add it to a list
258  * @dev: FPGA bridge device
262  * Get an exclusive reference to the bridge and it to the list.
270 	struct fpga_bridge *bridge;
273 	bridge = fpga_bridge_get(dev, info);
274 	if (IS_ERR(bridge))
275 		return PTR_ERR(bridge);
278 	list_add(&bridge->node, bridge_list);
288 	struct fpga_bridge *bridge = to_fpga_bridge(dev);
290 	return sprintf(buf, "%s\n", bridge->name);
296 	struct fpga_bridge *bridge = to_fpga_bridge(dev);
299 	if (bridge->br_ops->enable_show) {
300 		state = bridge->br_ops->enable_show(bridge);
320  * @parent:	FPGA bridge device from pdev
321  * @name:	FPGA bridge name
322  * @br_ops:	pointer to structure of fpga bridge ops
323  * @priv:	FPGA bridge private data
332 	struct fpga_bridge *bridge;
345 	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
346 	if (!bridge)
355 	mutex_init(&bridge->mutex);
356 	INIT_LIST_HEAD(&bridge->node);
358 	bridge->name = name;
359 	bridge->br_ops = br_ops;
360 	bridge->priv = priv;
362 	bridge->dev.groups = br_ops->groups;
363 	bridge->dev.class = &fpga_bridge_class;
364 	bridge->dev.parent = parent;
365 	bridge->dev.of_node = parent->of_node;
366 	bridge->dev.id = id;
368 	ret = dev_set_name(&bridge->dev, "br%d", id);
372 	ret = device_register(&bridge->dev);
374 		put_device(&bridge->dev);
378 	of_platform_populate(bridge->dev.of_node, NULL, NULL, &bridge->dev);
380 	return bridge;
385 	kfree(bridge);
392  * fpga_bridge_unregister - unregister an FPGA bridge
394  * @bridge: FPGA bridge struct
396  * This function is intended for use in an FPGA bridge driver's remove function.
398 void fpga_bridge_unregister(struct fpga_bridge *bridge)
401 	 * If the low level driver provides a method for putting bridge into
404 	if (bridge->br_ops->fpga_bridge_remove)
405 		bridge->br_ops->fpga_bridge_remove(bridge);
407 	device_unregister(&bridge->dev);
413 	struct fpga_bridge *bridge = to_fpga_bridge(dev);
415 	ida_free(&fpga_bridge_ida, bridge->dev.id);
416 	kfree(bridge);