554 lines
13 KiB
C
554 lines
13 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/host1x.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include "bus.h"
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#include "dev.h"
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static DEFINE_MUTEX(clients_lock);
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static LIST_HEAD(clients);
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static DEFINE_MUTEX(drivers_lock);
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static LIST_HEAD(drivers);
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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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*/
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static int host1x_subdev_add(struct host1x_device *device,
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struct device_node *np)
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{
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struct host1x_subdev *subdev;
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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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return 0;
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}
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/**
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* host1x_subdev_del() - remove subdevice
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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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*/
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static int host1x_device_parse_dt(struct host1x_device *device)
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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(device->driver->subdevs, np) &&
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of_device_is_available(np)) {
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err = host1x_subdev_add(device, np);
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if (err < 0)
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return err;
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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->parent = &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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/*
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* When all subdevices have been registered, the composite device is
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* ready to be probed.
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*/
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if (list_empty(&device->subdevs)) {
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err = device->driver->probe(device);
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if (err < 0)
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dev_err(&device->dev, "probe failed: %d\n", err);
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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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int err;
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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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err = device->driver->remove(device);
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if (err < 0)
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dev_err(&device->dev, "remove failed: %d\n", err);
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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->parent = 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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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->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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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_init);
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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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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 struct bus_type host1x_bus_type = {
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.name = "host1x",
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};
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int host1x_bus_init(void)
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{
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return bus_register(&host1x_bus_type);
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}
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void host1x_bus_exit(void)
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{
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bus_unregister(&host1x_bus_type);
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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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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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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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device->dev.release = host1x_device_release;
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dev_set_name(&device->dev, "%s", driver->name);
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device->dev.bus = &host1x_bus_type;
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device->dev.parent = host1x->dev;
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err = device_register(&device->dev);
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if (err < 0)
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return err;
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err = host1x_device_parse_dt(device);
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if (err < 0) {
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device_unregister(&device->dev);
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return err;
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}
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mutex_lock(&host1x->devices_lock);
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list_add_tail(&device->list, &host1x->devices);
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mutex_unlock(&host1x->devices_lock);
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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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* 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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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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device_unregister(&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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mutex_unlock(&host1x->devices_lock);
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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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}
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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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mutex_unlock(&host1x->devices_lock);
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}
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int host1x_register(struct host1x *host1x)
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{
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struct host1x_driver *driver;
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mutex_lock(&devices_lock);
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list_add_tail(&host1x->list, &devices);
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mutex_unlock(&devices_lock);
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mutex_lock(&drivers_lock);
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list_for_each_entry(driver, &drivers, list)
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host1x_attach_driver(host1x, driver);
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mutex_unlock(&drivers_lock);
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return 0;
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}
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int host1x_unregister(struct host1x *host1x)
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{
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struct host1x_driver *driver;
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mutex_lock(&drivers_lock);
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list_for_each_entry(driver, &drivers, list)
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host1x_detach_driver(host1x, driver);
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mutex_unlock(&drivers_lock);
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mutex_lock(&devices_lock);
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list_del_init(&host1x->list);
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mutex_unlock(&devices_lock);
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return 0;
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}
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int host1x_driver_register(struct host1x_driver *driver)
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{
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struct host1x *host1x;
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INIT_LIST_HEAD(&driver->list);
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mutex_lock(&drivers_lock);
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list_add_tail(&driver->list, &drivers);
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mutex_unlock(&drivers_lock);
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mutex_lock(&devices_lock);
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list_for_each_entry(host1x, &devices, list)
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host1x_attach_driver(host1x, driver);
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mutex_unlock(&devices_lock);
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return 0;
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}
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EXPORT_SYMBOL(host1x_driver_register);
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void host1x_driver_unregister(struct host1x_driver *driver)
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{
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mutex_lock(&drivers_lock);
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list_del_init(&driver->list);
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mutex_unlock(&drivers_lock);
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}
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EXPORT_SYMBOL(host1x_driver_unregister);
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int host1x_client_register(struct host1x_client *client)
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{
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struct host1x *host1x;
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int err;
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mutex_lock(&devices_lock);
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list_for_each_entry(host1x, &devices, list) {
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err = host1x_add_client(host1x, client);
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if (!err) {
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mutex_unlock(&devices_lock);
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return 0;
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}
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}
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mutex_unlock(&devices_lock);
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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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return 0;
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}
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EXPORT_SYMBOL(host1x_client_register);
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int host1x_client_unregister(struct host1x_client *client)
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{
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struct host1x_client *c;
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struct host1x *host1x;
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int err;
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mutex_lock(&devices_lock);
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list_for_each_entry(host1x, &devices, list) {
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err = host1x_del_client(host1x, client);
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if (!err) {
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mutex_unlock(&devices_lock);
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return 0;
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}
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}
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mutex_unlock(&devices_lock);
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mutex_lock(&clients_lock);
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list_for_each_entry(c, &clients, list) {
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if (c == client) {
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list_del_init(&c->list);
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break;
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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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EXPORT_SYMBOL(host1x_client_unregister);
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