blob: 92e25a7e00eabc28bd37572a8e2d2772b883e24f [file] [log] [blame]
/*
* Copyright (C) 2012 Avionic Design GmbH
* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include "drm.h"
struct host1x_drm_client {
struct host1x_client *client;
struct device_node *np;
struct list_head list;
};
static int host1x_add_drm_client(struct host1x *host1x, struct device_node *np)
{
struct host1x_drm_client *client;
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return -ENOMEM;
INIT_LIST_HEAD(&client->list);
client->np = of_node_get(np);
list_add_tail(&client->list, &host1x->drm_clients);
return 0;
}
static int host1x_activate_drm_client(struct host1x *host1x,
struct host1x_drm_client *drm,
struct host1x_client *client)
{
mutex_lock(&host1x->drm_clients_lock);
list_del_init(&drm->list);
list_add_tail(&drm->list, &host1x->drm_active);
drm->client = client;
mutex_unlock(&host1x->drm_clients_lock);
return 0;
}
static int host1x_remove_drm_client(struct host1x *host1x,
struct host1x_drm_client *client)
{
mutex_lock(&host1x->drm_clients_lock);
list_del_init(&client->list);
mutex_unlock(&host1x->drm_clients_lock);
of_node_put(client->np);
kfree(client);
return 0;
}
static int host1x_parse_dt(struct host1x *host1x)
{
static const char * const compat[] = {
"nvidia,tegra20-dc",
"nvidia,tegra20-hdmi",
"nvidia,tegra30-dc",
"nvidia,tegra30-hdmi",
};
unsigned int i;
int err;
for (i = 0; i < ARRAY_SIZE(compat); i++) {
struct device_node *np;
for_each_child_of_node(host1x->dev->of_node, np) {
if (of_device_is_compatible(np, compat[i]) &&
of_device_is_available(np)) {
err = host1x_add_drm_client(host1x, np);
if (err < 0)
return err;
}
}
}
return 0;
}
static int tegra_host1x_probe(struct platform_device *pdev)
{
struct host1x *host1x;
struct resource *regs;
int err;
host1x = devm_kzalloc(&pdev->dev, sizeof(*host1x), GFP_KERNEL);
if (!host1x)
return -ENOMEM;
mutex_init(&host1x->drm_clients_lock);
INIT_LIST_HEAD(&host1x->drm_clients);
INIT_LIST_HEAD(&host1x->drm_active);
mutex_init(&host1x->clients_lock);
INIT_LIST_HEAD(&host1x->clients);
host1x->dev = &pdev->dev;
err = host1x_parse_dt(host1x);
if (err < 0) {
dev_err(&pdev->dev, "failed to parse DT: %d\n", err);
return err;
}
host1x->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host1x->clk))
return PTR_ERR(host1x->clk);
err = clk_prepare_enable(host1x->clk);
if (err < 0)
return err;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
err = -ENXIO;
goto err;
}
err = platform_get_irq(pdev, 0);
if (err < 0)
goto err;
host1x->syncpt = err;
err = platform_get_irq(pdev, 1);
if (err < 0)
goto err;
host1x->irq = err;
host1x->regs = devm_ioremap_resource(&pdev->dev, regs);
if (IS_ERR(host1x->regs)) {
err = PTR_ERR(host1x->regs);
goto err;
}
platform_set_drvdata(pdev, host1x);
return 0;
err:
clk_disable_unprepare(host1x->clk);
return err;
}
static int tegra_host1x_remove(struct platform_device *pdev)
{
struct host1x *host1x = platform_get_drvdata(pdev);
clk_disable_unprepare(host1x->clk);
return 0;
}
int host1x_drm_init(struct host1x *host1x, struct drm_device *drm)
{
struct host1x_client *client;
mutex_lock(&host1x->clients_lock);
list_for_each_entry(client, &host1x->clients, list) {
if (client->ops && client->ops->drm_init) {
int err = client->ops->drm_init(client, drm);
if (err < 0) {
dev_err(host1x->dev,
"DRM setup failed for %s: %d\n",
dev_name(client->dev), err);
return err;
}
}
}
mutex_unlock(&host1x->clients_lock);
return 0;
}
int host1x_drm_exit(struct host1x *host1x)
{
struct platform_device *pdev = to_platform_device(host1x->dev);
struct host1x_client *client;
if (!host1x->drm)
return 0;
mutex_lock(&host1x->clients_lock);
list_for_each_entry_reverse(client, &host1x->clients, list) {
if (client->ops && client->ops->drm_exit) {
int err = client->ops->drm_exit(client);
if (err < 0) {
dev_err(host1x->dev,
"DRM cleanup failed for %s: %d\n",
dev_name(client->dev), err);
return err;
}
}
}
mutex_unlock(&host1x->clients_lock);
drm_platform_exit(&tegra_drm_driver, pdev);
host1x->drm = NULL;
return 0;
}
int host1x_register_client(struct host1x *host1x, struct host1x_client *client)
{
struct host1x_drm_client *drm, *tmp;
int err;
mutex_lock(&host1x->clients_lock);
list_add_tail(&client->list, &host1x->clients);
mutex_unlock(&host1x->clients_lock);
list_for_each_entry_safe(drm, tmp, &host1x->drm_clients, list)
if (drm->np == client->dev->of_node)
host1x_activate_drm_client(host1x, drm, client);
if (list_empty(&host1x->drm_clients)) {
struct platform_device *pdev = to_platform_device(host1x->dev);
err = drm_platform_init(&tegra_drm_driver, pdev);
if (err < 0) {
dev_err(host1x->dev, "drm_platform_init(): %d\n", err);
return err;
}
}
client->host1x = host1x;
return 0;
}
int host1x_unregister_client(struct host1x *host1x,
struct host1x_client *client)
{
struct host1x_drm_client *drm, *tmp;
int err;
list_for_each_entry_safe(drm, tmp, &host1x->drm_active, list) {
if (drm->client == client) {
err = host1x_drm_exit(host1x);
if (err < 0) {
dev_err(host1x->dev, "host1x_drm_exit(): %d\n",
err);
return err;
}
host1x_remove_drm_client(host1x, drm);
break;
}
}
mutex_lock(&host1x->clients_lock);
list_del_init(&client->list);
mutex_unlock(&host1x->clients_lock);
return 0;
}
static struct of_device_id tegra_host1x_of_match[] = {
{ .compatible = "nvidia,tegra30-host1x", },
{ .compatible = "nvidia,tegra20-host1x", },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_host1x_of_match);
struct platform_driver tegra_host1x_driver = {
.driver = {
.name = "tegra-host1x",
.owner = THIS_MODULE,
.of_match_table = tegra_host1x_of_match,
},
.probe = tegra_host1x_probe,
.remove = tegra_host1x_remove,
};
static int __init tegra_host1x_init(void)
{
int err;
err = platform_driver_register(&tegra_host1x_driver);
if (err < 0)
return err;
err = platform_driver_register(&tegra_dc_driver);
if (err < 0)
goto unregister_host1x;
err = platform_driver_register(&tegra_hdmi_driver);
if (err < 0)
goto unregister_dc;
return 0;
unregister_dc:
platform_driver_unregister(&tegra_dc_driver);
unregister_host1x:
platform_driver_unregister(&tegra_host1x_driver);
return err;
}
module_init(tegra_host1x_init);
static void __exit tegra_host1x_exit(void)
{
platform_driver_unregister(&tegra_hdmi_driver);
platform_driver_unregister(&tegra_dc_driver);
platform_driver_unregister(&tegra_host1x_driver);
}
module_exit(tegra_host1x_exit);
MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
MODULE_LICENSE("GPL");