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906 lines
22 KiB
906 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2012 Avionic Design GmbH |
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* Copyright (C) 2012-2013, NVIDIA Corporation |
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*/ |
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|
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#include <linux/debugfs.h> |
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#include <linux/host1x.h> |
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#include <linux/of.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include <linux/of_device.h> |
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|
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#include "bus.h" |
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#include "dev.h" |
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|
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static DEFINE_MUTEX(clients_lock); |
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static LIST_HEAD(clients); |
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|
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static DEFINE_MUTEX(drivers_lock); |
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static LIST_HEAD(drivers); |
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|
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static DEFINE_MUTEX(devices_lock); |
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static LIST_HEAD(devices); |
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struct host1x_subdev { |
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struct host1x_client *client; |
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struct device_node *np; |
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struct list_head list; |
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}; |
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/** |
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* host1x_subdev_add() - add a new subdevice with an associated device node |
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* @device: host1x device to add the subdevice to |
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* @driver: host1x driver containing the subdevices |
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* @np: device node |
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*/ |
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static int host1x_subdev_add(struct host1x_device *device, |
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struct host1x_driver *driver, |
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struct device_node *np) |
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{ |
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struct host1x_subdev *subdev; |
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struct device_node *child; |
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int err; |
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subdev = kzalloc(sizeof(*subdev), GFP_KERNEL); |
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if (!subdev) |
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return -ENOMEM; |
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INIT_LIST_HEAD(&subdev->list); |
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subdev->np = of_node_get(np); |
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mutex_lock(&device->subdevs_lock); |
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list_add_tail(&subdev->list, &device->subdevs); |
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mutex_unlock(&device->subdevs_lock); |
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|
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/* recursively add children */ |
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for_each_child_of_node(np, child) { |
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if (of_match_node(driver->subdevs, child) && |
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of_device_is_available(child)) { |
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err = host1x_subdev_add(device, driver, child); |
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if (err < 0) { |
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/* XXX cleanup? */ |
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of_node_put(child); |
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return err; |
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} |
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} |
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} |
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return 0; |
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} |
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/** |
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* host1x_subdev_del() - remove subdevice |
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* @subdev: subdevice to remove |
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*/ |
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static void host1x_subdev_del(struct host1x_subdev *subdev) |
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{ |
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list_del(&subdev->list); |
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of_node_put(subdev->np); |
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kfree(subdev); |
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} |
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/** |
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* host1x_device_parse_dt() - scan device tree and add matching subdevices |
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* @device: host1x logical device |
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* @driver: host1x driver |
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*/ |
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static int host1x_device_parse_dt(struct host1x_device *device, |
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struct host1x_driver *driver) |
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{ |
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struct device_node *np; |
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int err; |
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for_each_child_of_node(device->dev.parent->of_node, np) { |
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if (of_match_node(driver->subdevs, np) && |
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of_device_is_available(np)) { |
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err = host1x_subdev_add(device, driver, np); |
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if (err < 0) { |
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of_node_put(np); |
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return err; |
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} |
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} |
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} |
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return 0; |
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} |
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static void host1x_subdev_register(struct host1x_device *device, |
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struct host1x_subdev *subdev, |
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struct host1x_client *client) |
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{ |
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int err; |
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/* |
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* Move the subdevice to the list of active (registered) subdevices |
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* and associate it with a client. At the same time, associate the |
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* client with its parent device. |
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*/ |
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mutex_lock(&device->subdevs_lock); |
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mutex_lock(&device->clients_lock); |
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list_move_tail(&client->list, &device->clients); |
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list_move_tail(&subdev->list, &device->active); |
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client->host = &device->dev; |
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subdev->client = client; |
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mutex_unlock(&device->clients_lock); |
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mutex_unlock(&device->subdevs_lock); |
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if (list_empty(&device->subdevs)) { |
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err = device_add(&device->dev); |
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if (err < 0) |
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dev_err(&device->dev, "failed to add: %d\n", err); |
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else |
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device->registered = true; |
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} |
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} |
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static void __host1x_subdev_unregister(struct host1x_device *device, |
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struct host1x_subdev *subdev) |
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{ |
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struct host1x_client *client = subdev->client; |
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|
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/* |
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* If all subdevices have been activated, we're about to remove the |
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* first active subdevice, so unload the driver first. |
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*/ |
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if (list_empty(&device->subdevs)) { |
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if (device->registered) { |
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device->registered = false; |
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device_del(&device->dev); |
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} |
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} |
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/* |
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* Move the subdevice back to the list of idle subdevices and remove |
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* it from list of clients. |
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*/ |
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mutex_lock(&device->clients_lock); |
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subdev->client = NULL; |
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client->host = NULL; |
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list_move_tail(&subdev->list, &device->subdevs); |
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/* |
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* XXX: Perhaps don't do this here, but rather explicitly remove it |
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* when the device is about to be deleted. |
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* |
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* This is somewhat complicated by the fact that this function is |
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* used to remove the subdevice when a client is unregistered but |
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* also when the composite device is about to be removed. |
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*/ |
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list_del_init(&client->list); |
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mutex_unlock(&device->clients_lock); |
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} |
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static void host1x_subdev_unregister(struct host1x_device *device, |
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struct host1x_subdev *subdev) |
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{ |
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mutex_lock(&device->subdevs_lock); |
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__host1x_subdev_unregister(device, subdev); |
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mutex_unlock(&device->subdevs_lock); |
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} |
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/** |
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* host1x_device_init() - initialize a host1x logical device |
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* @device: host1x logical device |
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* |
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* The driver for the host1x logical device can call this during execution of |
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* its &host1x_driver.probe implementation to initialize each of its clients. |
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* The client drivers access the subsystem specific driver data using the |
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* &host1x_client.parent field and driver data associated with it (usually by |
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* calling dev_get_drvdata()). |
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*/ |
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int host1x_device_init(struct host1x_device *device) |
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{ |
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struct host1x_client *client; |
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int err; |
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mutex_lock(&device->clients_lock); |
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list_for_each_entry(client, &device->clients, list) { |
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if (client->ops && client->ops->early_init) { |
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err = client->ops->early_init(client); |
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if (err < 0) { |
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dev_err(&device->dev, "failed to early initialize %s: %d\n", |
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dev_name(client->dev), err); |
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goto teardown_late; |
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} |
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} |
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} |
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list_for_each_entry(client, &device->clients, list) { |
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if (client->ops && client->ops->init) { |
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err = client->ops->init(client); |
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if (err < 0) { |
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dev_err(&device->dev, |
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"failed to initialize %s: %d\n", |
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dev_name(client->dev), err); |
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goto teardown; |
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} |
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} |
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} |
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mutex_unlock(&device->clients_lock); |
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return 0; |
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teardown: |
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list_for_each_entry_continue_reverse(client, &device->clients, list) |
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if (client->ops->exit) |
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client->ops->exit(client); |
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/* reset client to end of list for late teardown */ |
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client = list_entry(&device->clients, struct host1x_client, list); |
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teardown_late: |
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list_for_each_entry_continue_reverse(client, &device->clients, list) |
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if (client->ops->late_exit) |
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client->ops->late_exit(client); |
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mutex_unlock(&device->clients_lock); |
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return err; |
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} |
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EXPORT_SYMBOL(host1x_device_init); |
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/** |
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* host1x_device_exit() - uninitialize host1x logical device |
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* @device: host1x logical device |
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* |
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* When the driver for a host1x logical device is unloaded, it can call this |
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* function to tear down each of its clients. Typically this is done after a |
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* subsystem-specific data structure is removed and the functionality can no |
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* longer be used. |
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*/ |
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int host1x_device_exit(struct host1x_device *device) |
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{ |
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struct host1x_client *client; |
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int err; |
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mutex_lock(&device->clients_lock); |
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list_for_each_entry_reverse(client, &device->clients, list) { |
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if (client->ops && client->ops->exit) { |
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err = client->ops->exit(client); |
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if (err < 0) { |
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dev_err(&device->dev, |
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"failed to cleanup %s: %d\n", |
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dev_name(client->dev), err); |
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mutex_unlock(&device->clients_lock); |
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return err; |
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} |
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} |
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} |
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list_for_each_entry_reverse(client, &device->clients, list) { |
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if (client->ops && client->ops->late_exit) { |
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err = client->ops->late_exit(client); |
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if (err < 0) { |
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dev_err(&device->dev, "failed to late cleanup %s: %d\n", |
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dev_name(client->dev), err); |
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mutex_unlock(&device->clients_lock); |
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return err; |
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} |
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} |
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} |
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mutex_unlock(&device->clients_lock); |
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return 0; |
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} |
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EXPORT_SYMBOL(host1x_device_exit); |
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static int host1x_add_client(struct host1x *host1x, |
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struct host1x_client *client) |
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{ |
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struct host1x_device *device; |
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struct host1x_subdev *subdev; |
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mutex_lock(&host1x->devices_lock); |
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list_for_each_entry(device, &host1x->devices, list) { |
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list_for_each_entry(subdev, &device->subdevs, list) { |
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if (subdev->np == client->dev->of_node) { |
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host1x_subdev_register(device, subdev, client); |
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mutex_unlock(&host1x->devices_lock); |
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return 0; |
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} |
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} |
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} |
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mutex_unlock(&host1x->devices_lock); |
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return -ENODEV; |
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} |
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static int host1x_del_client(struct host1x *host1x, |
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struct host1x_client *client) |
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{ |
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struct host1x_device *device, *dt; |
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struct host1x_subdev *subdev; |
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mutex_lock(&host1x->devices_lock); |
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list_for_each_entry_safe(device, dt, &host1x->devices, list) { |
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list_for_each_entry(subdev, &device->active, list) { |
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if (subdev->client == client) { |
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host1x_subdev_unregister(device, subdev); |
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mutex_unlock(&host1x->devices_lock); |
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return 0; |
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} |
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} |
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} |
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mutex_unlock(&host1x->devices_lock); |
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return -ENODEV; |
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} |
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static int host1x_device_match(struct device *dev, struct device_driver *drv) |
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{ |
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return strcmp(dev_name(dev), drv->name) == 0; |
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} |
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static int host1x_device_uevent(struct device *dev, |
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struct kobj_uevent_env *env) |
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{ |
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struct device_node *np = dev->parent->of_node; |
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unsigned int count = 0; |
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struct property *p; |
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const char *compat; |
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/* |
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* This duplicates most of of_device_uevent(), but the latter cannot |
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* be called from modules and operates on dev->of_node, which is not |
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* available in this case. |
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* |
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* Note that this is really only needed for backwards compatibility |
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* with libdrm, which parses this information from sysfs and will |
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* fail if it can't find the OF_FULLNAME, specifically. |
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*/ |
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add_uevent_var(env, "OF_NAME=%pOFn", np); |
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add_uevent_var(env, "OF_FULLNAME=%pOF", np); |
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of_property_for_each_string(np, "compatible", p, compat) { |
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add_uevent_var(env, "OF_COMPATIBLE_%u=%s", count, compat); |
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count++; |
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} |
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add_uevent_var(env, "OF_COMPATIBLE_N=%u", count); |
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return 0; |
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} |
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static int host1x_dma_configure(struct device *dev) |
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{ |
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return of_dma_configure(dev, dev->of_node, true); |
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} |
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static const struct dev_pm_ops host1x_device_pm_ops = { |
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.suspend = pm_generic_suspend, |
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.resume = pm_generic_resume, |
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.freeze = pm_generic_freeze, |
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.thaw = pm_generic_thaw, |
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.poweroff = pm_generic_poweroff, |
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.restore = pm_generic_restore, |
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}; |
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struct bus_type host1x_bus_type = { |
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.name = "host1x", |
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.match = host1x_device_match, |
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.uevent = host1x_device_uevent, |
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.dma_configure = host1x_dma_configure, |
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.pm = &host1x_device_pm_ops, |
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}; |
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static void __host1x_device_del(struct host1x_device *device) |
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{ |
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struct host1x_subdev *subdev, *sd; |
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struct host1x_client *client, *cl; |
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mutex_lock(&device->subdevs_lock); |
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/* unregister subdevices */ |
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list_for_each_entry_safe(subdev, sd, &device->active, list) { |
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/* |
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* host1x_subdev_unregister() will remove the client from |
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* any lists, so we'll need to manually add it back to the |
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* list of idle clients. |
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* |
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* XXX: Alternatively, perhaps don't remove the client from |
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* any lists in host1x_subdev_unregister() and instead do |
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* that explicitly from host1x_unregister_client()? |
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*/ |
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client = subdev->client; |
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__host1x_subdev_unregister(device, subdev); |
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/* add the client to the list of idle clients */ |
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mutex_lock(&clients_lock); |
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list_add_tail(&client->list, &clients); |
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mutex_unlock(&clients_lock); |
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} |
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/* remove subdevices */ |
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list_for_each_entry_safe(subdev, sd, &device->subdevs, list) |
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host1x_subdev_del(subdev); |
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mutex_unlock(&device->subdevs_lock); |
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/* move clients to idle list */ |
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mutex_lock(&clients_lock); |
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mutex_lock(&device->clients_lock); |
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list_for_each_entry_safe(client, cl, &device->clients, list) |
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list_move_tail(&client->list, &clients); |
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mutex_unlock(&device->clients_lock); |
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mutex_unlock(&clients_lock); |
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/* finally remove the device */ |
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list_del_init(&device->list); |
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} |
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static void host1x_device_release(struct device *dev) |
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{ |
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struct host1x_device *device = to_host1x_device(dev); |
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__host1x_device_del(device); |
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kfree(device); |
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} |
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static int host1x_device_add(struct host1x *host1x, |
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struct host1x_driver *driver) |
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{ |
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struct host1x_client *client, *tmp; |
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struct host1x_subdev *subdev; |
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struct host1x_device *device; |
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int err; |
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device = kzalloc(sizeof(*device), GFP_KERNEL); |
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if (!device) |
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return -ENOMEM; |
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device_initialize(&device->dev); |
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mutex_init(&device->subdevs_lock); |
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INIT_LIST_HEAD(&device->subdevs); |
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INIT_LIST_HEAD(&device->active); |
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mutex_init(&device->clients_lock); |
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INIT_LIST_HEAD(&device->clients); |
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INIT_LIST_HEAD(&device->list); |
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device->driver = driver; |
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device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask; |
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device->dev.dma_mask = &device->dev.coherent_dma_mask; |
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dev_set_name(&device->dev, "%s", driver->driver.name); |
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device->dev.release = host1x_device_release; |
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device->dev.bus = &host1x_bus_type; |
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device->dev.parent = host1x->dev; |
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of_dma_configure(&device->dev, host1x->dev->of_node, true); |
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device->dev.dma_parms = &device->dma_parms; |
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dma_set_max_seg_size(&device->dev, UINT_MAX); |
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err = host1x_device_parse_dt(device, driver); |
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if (err < 0) { |
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kfree(device); |
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return err; |
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} |
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list_add_tail(&device->list, &host1x->devices); |
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mutex_lock(&clients_lock); |
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list_for_each_entry_safe(client, tmp, &clients, list) { |
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list_for_each_entry(subdev, &device->subdevs, list) { |
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if (subdev->np == client->dev->of_node) { |
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host1x_subdev_register(device, subdev, client); |
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break; |
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} |
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} |
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} |
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mutex_unlock(&clients_lock); |
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return 0; |
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} |
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|
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/* |
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* Removes a device by first unregistering any subdevices and then removing |
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* itself from the list of devices. |
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* |
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* This function must be called with the host1x->devices_lock held. |
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*/ |
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static void host1x_device_del(struct host1x *host1x, |
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struct host1x_device *device) |
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{ |
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if (device->registered) { |
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device->registered = false; |
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device_del(&device->dev); |
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} |
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put_device(&device->dev); |
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} |
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static void host1x_attach_driver(struct host1x *host1x, |
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struct host1x_driver *driver) |
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{ |
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struct host1x_device *device; |
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int err; |
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mutex_lock(&host1x->devices_lock); |
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list_for_each_entry(device, &host1x->devices, list) { |
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if (device->driver == driver) { |
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mutex_unlock(&host1x->devices_lock); |
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return; |
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} |
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} |
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err = host1x_device_add(host1x, driver); |
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if (err < 0) |
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dev_err(host1x->dev, "failed to allocate device: %d\n", err); |
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mutex_unlock(&host1x->devices_lock); |
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} |
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|
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static void host1x_detach_driver(struct host1x *host1x, |
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struct host1x_driver *driver) |
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{ |
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struct host1x_device *device, *tmp; |
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mutex_lock(&host1x->devices_lock); |
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list_for_each_entry_safe(device, tmp, &host1x->devices, list) |
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if (device->driver == driver) |
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host1x_device_del(host1x, device); |
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|
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mutex_unlock(&host1x->devices_lock); |
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} |
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|
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static int host1x_devices_show(struct seq_file *s, void *data) |
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{ |
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struct host1x *host1x = s->private; |
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struct host1x_device *device; |
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|
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mutex_lock(&host1x->devices_lock); |
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|
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list_for_each_entry(device, &host1x->devices, list) { |
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struct host1x_subdev *subdev; |
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|
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seq_printf(s, "%s\n", dev_name(&device->dev)); |
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|
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mutex_lock(&device->subdevs_lock); |
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list_for_each_entry(subdev, &device->active, list) |
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seq_printf(s, " %pOFf: %s\n", subdev->np, |
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dev_name(subdev->client->dev)); |
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list_for_each_entry(subdev, &device->subdevs, list) |
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seq_printf(s, " %pOFf:\n", subdev->np); |
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|
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mutex_unlock(&device->subdevs_lock); |
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} |
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mutex_unlock(&host1x->devices_lock); |
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|
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(host1x_devices); |
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|
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/** |
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* host1x_register() - register a host1x controller |
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* @host1x: host1x controller |
|
* |
|
* The host1x controller driver uses this to register a host1x controller with |
|
* the infrastructure. Note that all Tegra SoC generations have only ever come |
|
* with a single host1x instance, so this function is somewhat academic. |
|
*/ |
|
int host1x_register(struct host1x *host1x) |
|
{ |
|
struct host1x_driver *driver; |
|
|
|
mutex_lock(&devices_lock); |
|
list_add_tail(&host1x->list, &devices); |
|
mutex_unlock(&devices_lock); |
|
|
|
mutex_lock(&drivers_lock); |
|
|
|
list_for_each_entry(driver, &drivers, list) |
|
host1x_attach_driver(host1x, driver); |
|
|
|
mutex_unlock(&drivers_lock); |
|
|
|
debugfs_create_file("devices", S_IRUGO, host1x->debugfs, host1x, |
|
&host1x_devices_fops); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* host1x_unregister() - unregister a host1x controller |
|
* @host1x: host1x controller |
|
* |
|
* The host1x controller driver uses this to remove a host1x controller from |
|
* the infrastructure. |
|
*/ |
|
int host1x_unregister(struct host1x *host1x) |
|
{ |
|
struct host1x_driver *driver; |
|
|
|
mutex_lock(&drivers_lock); |
|
|
|
list_for_each_entry(driver, &drivers, list) |
|
host1x_detach_driver(host1x, driver); |
|
|
|
mutex_unlock(&drivers_lock); |
|
|
|
mutex_lock(&devices_lock); |
|
list_del_init(&host1x->list); |
|
mutex_unlock(&devices_lock); |
|
|
|
return 0; |
|
} |
|
|
|
static int host1x_device_probe(struct device *dev) |
|
{ |
|
struct host1x_driver *driver = to_host1x_driver(dev->driver); |
|
struct host1x_device *device = to_host1x_device(dev); |
|
|
|
if (driver->probe) |
|
return driver->probe(device); |
|
|
|
return 0; |
|
} |
|
|
|
static int host1x_device_remove(struct device *dev) |
|
{ |
|
struct host1x_driver *driver = to_host1x_driver(dev->driver); |
|
struct host1x_device *device = to_host1x_device(dev); |
|
|
|
if (driver->remove) |
|
return driver->remove(device); |
|
|
|
return 0; |
|
} |
|
|
|
static void host1x_device_shutdown(struct device *dev) |
|
{ |
|
struct host1x_driver *driver = to_host1x_driver(dev->driver); |
|
struct host1x_device *device = to_host1x_device(dev); |
|
|
|
if (driver->shutdown) |
|
driver->shutdown(device); |
|
} |
|
|
|
/** |
|
* host1x_driver_register_full() - register a host1x driver |
|
* @driver: host1x driver |
|
* @owner: owner module |
|
* |
|
* Drivers for host1x logical devices call this function to register a driver |
|
* with the infrastructure. Note that since these drive logical devices, the |
|
* registration of the driver actually triggers tho logical device creation. |
|
* A logical device will be created for each host1x instance. |
|
*/ |
|
int host1x_driver_register_full(struct host1x_driver *driver, |
|
struct module *owner) |
|
{ |
|
struct host1x *host1x; |
|
|
|
INIT_LIST_HEAD(&driver->list); |
|
|
|
mutex_lock(&drivers_lock); |
|
list_add_tail(&driver->list, &drivers); |
|
mutex_unlock(&drivers_lock); |
|
|
|
mutex_lock(&devices_lock); |
|
|
|
list_for_each_entry(host1x, &devices, list) |
|
host1x_attach_driver(host1x, driver); |
|
|
|
mutex_unlock(&devices_lock); |
|
|
|
driver->driver.bus = &host1x_bus_type; |
|
driver->driver.owner = owner; |
|
driver->driver.probe = host1x_device_probe; |
|
driver->driver.remove = host1x_device_remove; |
|
driver->driver.shutdown = host1x_device_shutdown; |
|
|
|
return driver_register(&driver->driver); |
|
} |
|
EXPORT_SYMBOL(host1x_driver_register_full); |
|
|
|
/** |
|
* host1x_driver_unregister() - unregister a host1x driver |
|
* @driver: host1x driver |
|
* |
|
* Unbinds the driver from each of the host1x logical devices that it is |
|
* bound to, effectively removing the subsystem devices that they represent. |
|
*/ |
|
void host1x_driver_unregister(struct host1x_driver *driver) |
|
{ |
|
struct host1x *host1x; |
|
|
|
driver_unregister(&driver->driver); |
|
|
|
mutex_lock(&devices_lock); |
|
|
|
list_for_each_entry(host1x, &devices, list) |
|
host1x_detach_driver(host1x, driver); |
|
|
|
mutex_unlock(&devices_lock); |
|
|
|
mutex_lock(&drivers_lock); |
|
list_del_init(&driver->list); |
|
mutex_unlock(&drivers_lock); |
|
} |
|
EXPORT_SYMBOL(host1x_driver_unregister); |
|
|
|
/** |
|
* __host1x_client_init() - initialize a host1x client |
|
* @client: host1x client |
|
* @key: lock class key for the client-specific mutex |
|
*/ |
|
void __host1x_client_init(struct host1x_client *client, struct lock_class_key *key) |
|
{ |
|
INIT_LIST_HEAD(&client->list); |
|
__mutex_init(&client->lock, "host1x client lock", key); |
|
client->usecount = 0; |
|
} |
|
EXPORT_SYMBOL(__host1x_client_init); |
|
|
|
/** |
|
* host1x_client_exit() - uninitialize a host1x client |
|
* @client: host1x client |
|
*/ |
|
void host1x_client_exit(struct host1x_client *client) |
|
{ |
|
mutex_destroy(&client->lock); |
|
} |
|
EXPORT_SYMBOL(host1x_client_exit); |
|
|
|
/** |
|
* __host1x_client_register() - register a host1x client |
|
* @client: host1x client |
|
* @key: lock class key for the client-specific mutex |
|
* |
|
* Registers a host1x client with each host1x controller instance. Note that |
|
* each client will only match their parent host1x controller and will only be |
|
* associated with that instance. Once all clients have been registered with |
|
* their parent host1x controller, the infrastructure will set up the logical |
|
* device and call host1x_device_init(), which will in turn call each client's |
|
* &host1x_client_ops.init implementation. |
|
*/ |
|
int __host1x_client_register(struct host1x_client *client) |
|
{ |
|
struct host1x *host1x; |
|
int err; |
|
|
|
mutex_lock(&devices_lock); |
|
|
|
list_for_each_entry(host1x, &devices, list) { |
|
err = host1x_add_client(host1x, client); |
|
if (!err) { |
|
mutex_unlock(&devices_lock); |
|
return 0; |
|
} |
|
} |
|
|
|
mutex_unlock(&devices_lock); |
|
|
|
mutex_lock(&clients_lock); |
|
list_add_tail(&client->list, &clients); |
|
mutex_unlock(&clients_lock); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(__host1x_client_register); |
|
|
|
/** |
|
* host1x_client_unregister() - unregister a host1x client |
|
* @client: host1x client |
|
* |
|
* Removes a host1x client from its host1x controller instance. If a logical |
|
* device has already been initialized, it will be torn down. |
|
*/ |
|
int host1x_client_unregister(struct host1x_client *client) |
|
{ |
|
struct host1x_client *c; |
|
struct host1x *host1x; |
|
int err; |
|
|
|
mutex_lock(&devices_lock); |
|
|
|
list_for_each_entry(host1x, &devices, list) { |
|
err = host1x_del_client(host1x, client); |
|
if (!err) { |
|
mutex_unlock(&devices_lock); |
|
return 0; |
|
} |
|
} |
|
|
|
mutex_unlock(&devices_lock); |
|
mutex_lock(&clients_lock); |
|
|
|
list_for_each_entry(c, &clients, list) { |
|
if (c == client) { |
|
list_del_init(&c->list); |
|
break; |
|
} |
|
} |
|
|
|
mutex_unlock(&clients_lock); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(host1x_client_unregister); |
|
|
|
int host1x_client_suspend(struct host1x_client *client) |
|
{ |
|
int err = 0; |
|
|
|
mutex_lock(&client->lock); |
|
|
|
if (client->usecount == 1) { |
|
if (client->ops && client->ops->suspend) { |
|
err = client->ops->suspend(client); |
|
if (err < 0) |
|
goto unlock; |
|
} |
|
} |
|
|
|
client->usecount--; |
|
dev_dbg(client->dev, "use count: %u\n", client->usecount); |
|
|
|
if (client->parent) { |
|
err = host1x_client_suspend(client->parent); |
|
if (err < 0) |
|
goto resume; |
|
} |
|
|
|
goto unlock; |
|
|
|
resume: |
|
if (client->usecount == 0) |
|
if (client->ops && client->ops->resume) |
|
client->ops->resume(client); |
|
|
|
client->usecount++; |
|
unlock: |
|
mutex_unlock(&client->lock); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(host1x_client_suspend); |
|
|
|
int host1x_client_resume(struct host1x_client *client) |
|
{ |
|
int err = 0; |
|
|
|
mutex_lock(&client->lock); |
|
|
|
if (client->parent) { |
|
err = host1x_client_resume(client->parent); |
|
if (err < 0) |
|
goto unlock; |
|
} |
|
|
|
if (client->usecount == 0) { |
|
if (client->ops && client->ops->resume) { |
|
err = client->ops->resume(client); |
|
if (err < 0) |
|
goto suspend; |
|
} |
|
} |
|
|
|
client->usecount++; |
|
dev_dbg(client->dev, "use count: %u\n", client->usecount); |
|
|
|
goto unlock; |
|
|
|
suspend: |
|
if (client->parent) |
|
host1x_client_suspend(client->parent); |
|
unlock: |
|
mutex_unlock(&client->lock); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(host1x_client_resume);
|
|
|