drivers/gpu/drm/tegra/host1x.c - manifest_repos/salami - Git at Google

 /*
  * 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_request_and_ioremap(&pdev->dev, regs);
 	if (!host1x->regs) {
 		err = -EADDRNOTAVAIL;
 		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");
	/*
	* 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_request_and_ioremap(&pdev->dev, regs);
	if (!host1x->regs) {
	err = -EADDRNOTAVAIL;
	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");