553 lines
13 KiB
C
553 lines
13 KiB
C
/*
|
|
* Copyright (C) 2012 Avionic Design GmbH
|
|
* Copyright (C) 2012-2013, NVIDIA Corporation
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <linux/host1x.h>
|
|
#include <linux/of.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "bus.h"
|
|
#include "dev.h"
|
|
|
|
static DEFINE_MUTEX(clients_lock);
|
|
static LIST_HEAD(clients);
|
|
|
|
static DEFINE_MUTEX(drivers_lock);
|
|
static LIST_HEAD(drivers);
|
|
|
|
static DEFINE_MUTEX(devices_lock);
|
|
static LIST_HEAD(devices);
|
|
|
|
struct host1x_subdev {
|
|
struct host1x_client *client;
|
|
struct device_node *np;
|
|
struct list_head list;
|
|
};
|
|
|
|
/**
|
|
* host1x_subdev_add() - add a new subdevice with an associated device node
|
|
*/
|
|
static int host1x_subdev_add(struct host1x_device *device,
|
|
struct device_node *np)
|
|
{
|
|
struct host1x_subdev *subdev;
|
|
|
|
subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
|
|
if (!subdev)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&subdev->list);
|
|
subdev->np = of_node_get(np);
|
|
|
|
mutex_lock(&device->subdevs_lock);
|
|
list_add_tail(&subdev->list, &device->subdevs);
|
|
mutex_unlock(&device->subdevs_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* host1x_subdev_del() - remove subdevice
|
|
*/
|
|
static void host1x_subdev_del(struct host1x_subdev *subdev)
|
|
{
|
|
list_del(&subdev->list);
|
|
of_node_put(subdev->np);
|
|
kfree(subdev);
|
|
}
|
|
|
|
/**
|
|
* host1x_device_parse_dt() - scan device tree and add matching subdevices
|
|
*/
|
|
static int host1x_device_parse_dt(struct host1x_device *device)
|
|
{
|
|
struct device_node *np;
|
|
int err;
|
|
|
|
for_each_child_of_node(device->dev.parent->of_node, np) {
|
|
if (of_match_node(device->driver->subdevs, np) &&
|
|
of_device_is_available(np)) {
|
|
err = host1x_subdev_add(device, np);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void host1x_subdev_register(struct host1x_device *device,
|
|
struct host1x_subdev *subdev,
|
|
struct host1x_client *client)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* Move the subdevice to the list of active (registered) subdevices
|
|
* and associate it with a client. At the same time, associate the
|
|
* client with its parent device.
|
|
*/
|
|
mutex_lock(&device->subdevs_lock);
|
|
mutex_lock(&device->clients_lock);
|
|
list_move_tail(&client->list, &device->clients);
|
|
list_move_tail(&subdev->list, &device->active);
|
|
client->parent = &device->dev;
|
|
subdev->client = client;
|
|
mutex_unlock(&device->clients_lock);
|
|
mutex_unlock(&device->subdevs_lock);
|
|
|
|
/*
|
|
* When all subdevices have been registered, the composite device is
|
|
* ready to be probed.
|
|
*/
|
|
if (list_empty(&device->subdevs)) {
|
|
err = device->driver->probe(device);
|
|
if (err < 0)
|
|
dev_err(&device->dev, "probe failed: %d\n", err);
|
|
}
|
|
}
|
|
|
|
static void __host1x_subdev_unregister(struct host1x_device *device,
|
|
struct host1x_subdev *subdev)
|
|
{
|
|
struct host1x_client *client = subdev->client;
|
|
int err;
|
|
|
|
/*
|
|
* If all subdevices have been activated, we're about to remove the
|
|
* first active subdevice, so unload the driver first.
|
|
*/
|
|
if (list_empty(&device->subdevs)) {
|
|
err = device->driver->remove(device);
|
|
if (err < 0)
|
|
dev_err(&device->dev, "remove failed: %d\n", err);
|
|
}
|
|
|
|
/*
|
|
* Move the subdevice back to the list of idle subdevices and remove
|
|
* it from list of clients.
|
|
*/
|
|
mutex_lock(&device->clients_lock);
|
|
subdev->client = NULL;
|
|
client->parent = NULL;
|
|
list_move_tail(&subdev->list, &device->subdevs);
|
|
/*
|
|
* XXX: Perhaps don't do this here, but rather explicitly remove it
|
|
* when the device is about to be deleted.
|
|
*
|
|
* This is somewhat complicated by the fact that this function is
|
|
* used to remove the subdevice when a client is unregistered but
|
|
* also when the composite device is about to be removed.
|
|
*/
|
|
list_del_init(&client->list);
|
|
mutex_unlock(&device->clients_lock);
|
|
}
|
|
|
|
static void host1x_subdev_unregister(struct host1x_device *device,
|
|
struct host1x_subdev *subdev)
|
|
{
|
|
mutex_lock(&device->subdevs_lock);
|
|
__host1x_subdev_unregister(device, subdev);
|
|
mutex_unlock(&device->subdevs_lock);
|
|
}
|
|
|
|
int host1x_device_init(struct host1x_device *device)
|
|
{
|
|
struct host1x_client *client;
|
|
int err;
|
|
|
|
mutex_lock(&device->clients_lock);
|
|
|
|
list_for_each_entry(client, &device->clients, list) {
|
|
if (client->ops && client->ops->init) {
|
|
err = client->ops->init(client);
|
|
if (err < 0) {
|
|
dev_err(&device->dev,
|
|
"failed to initialize %s: %d\n",
|
|
dev_name(client->dev), err);
|
|
mutex_unlock(&device->clients_lock);
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&device->clients_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(host1x_device_init);
|
|
|
|
int host1x_device_exit(struct host1x_device *device)
|
|
{
|
|
struct host1x_client *client;
|
|
int err;
|
|
|
|
mutex_lock(&device->clients_lock);
|
|
|
|
list_for_each_entry_reverse(client, &device->clients, list) {
|
|
if (client->ops && client->ops->exit) {
|
|
err = client->ops->exit(client);
|
|
if (err < 0) {
|
|
dev_err(&device->dev,
|
|
"failed to cleanup %s: %d\n",
|
|
dev_name(client->dev), err);
|
|
mutex_unlock(&device->clients_lock);
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&device->clients_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(host1x_device_exit);
|
|
|
|
static int host1x_add_client(struct host1x *host1x,
|
|
struct host1x_client *client)
|
|
{
|
|
struct host1x_device *device;
|
|
struct host1x_subdev *subdev;
|
|
|
|
mutex_lock(&host1x->devices_lock);
|
|
|
|
list_for_each_entry(device, &host1x->devices, list) {
|
|
list_for_each_entry(subdev, &device->subdevs, list) {
|
|
if (subdev->np == client->dev->of_node) {
|
|
host1x_subdev_register(device, subdev, client);
|
|
mutex_unlock(&host1x->devices_lock);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&host1x->devices_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int host1x_del_client(struct host1x *host1x,
|
|
struct host1x_client *client)
|
|
{
|
|
struct host1x_device *device, *dt;
|
|
struct host1x_subdev *subdev;
|
|
|
|
mutex_lock(&host1x->devices_lock);
|
|
|
|
list_for_each_entry_safe(device, dt, &host1x->devices, list) {
|
|
list_for_each_entry(subdev, &device->active, list) {
|
|
if (subdev->client == client) {
|
|
host1x_subdev_unregister(device, subdev);
|
|
mutex_unlock(&host1x->devices_lock);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&host1x->devices_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static struct bus_type host1x_bus_type = {
|
|
.name = "host1x",
|
|
};
|
|
|
|
int host1x_bus_init(void)
|
|
{
|
|
return bus_register(&host1x_bus_type);
|
|
}
|
|
|
|
void host1x_bus_exit(void)
|
|
{
|
|
bus_unregister(&host1x_bus_type);
|
|
}
|
|
|
|
static void host1x_device_release(struct device *dev)
|
|
{
|
|
struct host1x_device *device = to_host1x_device(dev);
|
|
|
|
kfree(device);
|
|
}
|
|
|
|
static int host1x_device_add(struct host1x *host1x,
|
|
struct host1x_driver *driver)
|
|
{
|
|
struct host1x_client *client, *tmp;
|
|
struct host1x_subdev *subdev;
|
|
struct host1x_device *device;
|
|
int err;
|
|
|
|
device = kzalloc(sizeof(*device), GFP_KERNEL);
|
|
if (!device)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&device->subdevs_lock);
|
|
INIT_LIST_HEAD(&device->subdevs);
|
|
INIT_LIST_HEAD(&device->active);
|
|
mutex_init(&device->clients_lock);
|
|
INIT_LIST_HEAD(&device->clients);
|
|
INIT_LIST_HEAD(&device->list);
|
|
device->driver = driver;
|
|
|
|
device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask;
|
|
device->dev.dma_mask = &device->dev.coherent_dma_mask;
|
|
device->dev.release = host1x_device_release;
|
|
dev_set_name(&device->dev, "%s", driver->name);
|
|
device->dev.bus = &host1x_bus_type;
|
|
device->dev.parent = host1x->dev;
|
|
|
|
err = device_register(&device->dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = host1x_device_parse_dt(device);
|
|
if (err < 0) {
|
|
device_unregister(&device->dev);
|
|
return err;
|
|
}
|
|
|
|
mutex_lock(&host1x->devices_lock);
|
|
list_add_tail(&device->list, &host1x->devices);
|
|
mutex_unlock(&host1x->devices_lock);
|
|
|
|
mutex_lock(&clients_lock);
|
|
|
|
list_for_each_entry_safe(client, tmp, &clients, list) {
|
|
list_for_each_entry(subdev, &device->subdevs, list) {
|
|
if (subdev->np == client->dev->of_node) {
|
|
host1x_subdev_register(device, subdev, client);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&clients_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Removes a device by first unregistering any subdevices and then removing
|
|
* itself from the list of devices.
|
|
*
|
|
* This function must be called with the host1x->devices_lock held.
|
|
*/
|
|
static void host1x_device_del(struct host1x *host1x,
|
|
struct host1x_device *device)
|
|
{
|
|
struct host1x_subdev *subdev, *sd;
|
|
struct host1x_client *client, *cl;
|
|
|
|
mutex_lock(&device->subdevs_lock);
|
|
|
|
/* unregister subdevices */
|
|
list_for_each_entry_safe(subdev, sd, &device->active, list) {
|
|
/*
|
|
* host1x_subdev_unregister() will remove the client from
|
|
* any lists, so we'll need to manually add it back to the
|
|
* list of idle clients.
|
|
*
|
|
* XXX: Alternatively, perhaps don't remove the client from
|
|
* any lists in host1x_subdev_unregister() and instead do
|
|
* that explicitly from host1x_unregister_client()?
|
|
*/
|
|
client = subdev->client;
|
|
|
|
__host1x_subdev_unregister(device, subdev);
|
|
|
|
/* add the client to the list of idle clients */
|
|
mutex_lock(&clients_lock);
|
|
list_add_tail(&client->list, &clients);
|
|
mutex_unlock(&clients_lock);
|
|
}
|
|
|
|
/* remove subdevices */
|
|
list_for_each_entry_safe(subdev, sd, &device->subdevs, list)
|
|
host1x_subdev_del(subdev);
|
|
|
|
mutex_unlock(&device->subdevs_lock);
|
|
|
|
/* move clients to idle list */
|
|
mutex_lock(&clients_lock);
|
|
mutex_lock(&device->clients_lock);
|
|
|
|
list_for_each_entry_safe(client, cl, &device->clients, list)
|
|
list_move_tail(&client->list, &clients);
|
|
|
|
mutex_unlock(&device->clients_lock);
|
|
mutex_unlock(&clients_lock);
|
|
|
|
/* finally remove the device */
|
|
list_del_init(&device->list);
|
|
device_unregister(&device->dev);
|
|
}
|
|
|
|
static void host1x_attach_driver(struct host1x *host1x,
|
|
struct host1x_driver *driver)
|
|
{
|
|
struct host1x_device *device;
|
|
int err;
|
|
|
|
mutex_lock(&host1x->devices_lock);
|
|
|
|
list_for_each_entry(device, &host1x->devices, list) {
|
|
if (device->driver == driver) {
|
|
mutex_unlock(&host1x->devices_lock);
|
|
return;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&host1x->devices_lock);
|
|
|
|
err = host1x_device_add(host1x, driver);
|
|
if (err < 0)
|
|
dev_err(host1x->dev, "failed to allocate device: %d\n", err);
|
|
}
|
|
|
|
static void host1x_detach_driver(struct host1x *host1x,
|
|
struct host1x_driver *driver)
|
|
{
|
|
struct host1x_device *device, *tmp;
|
|
|
|
mutex_lock(&host1x->devices_lock);
|
|
|
|
list_for_each_entry_safe(device, tmp, &host1x->devices, list)
|
|
if (device->driver == driver)
|
|
host1x_device_del(host1x, device);
|
|
|
|
mutex_unlock(&host1x->devices_lock);
|
|
}
|
|
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int host1x_driver_register(struct host1x_driver *driver)
|
|
{
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(host1x_driver_register);
|
|
|
|
void host1x_driver_unregister(struct host1x_driver *driver)
|
|
{
|
|
mutex_lock(&drivers_lock);
|
|
list_del_init(&driver->list);
|
|
mutex_unlock(&drivers_lock);
|
|
}
|
|
EXPORT_SYMBOL(host1x_driver_unregister);
|
|
|
|
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);
|
|
|
|
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);
|