[linux-2.6-block.git] / drivers / gpu / host1x / drm / host1x.c

/*
 * 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_drm *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_drm *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_drm *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_drm *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_drm *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_drm *host1x = platform_get_drvdata(pdev);

	clk_disable_unprepare(host1x->clk);

	return 0;
}

int host1x_drm_init(struct host1x_drm *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_drm *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_drm *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_drm *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");
Commit	Line	Data
d8f4a9ed TR	1	/*
	2	* Copyright (C) 2012 Avionic Design GmbH
	3	* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/clk.h>
	11	#include <linux/err.h>
	12	#include <linux/module.h>
	13	#include <linux/of.h>
	14	#include <linux/platform_device.h>
	15
	16	#include "drm.h"
	17
	18	struct host1x_drm_client {
	19	struct host1x_client *client;
	20	struct device_node *np;
	21	struct list_head list;
	22	};
	23
c89c0ea6 AM	24	static int host1x_add_drm_client(struct host1x_drm *host1x,
c89c0ea6 AM	25	struct device_node *np)
d8f4a9ed TR	26	{
	27	struct host1x_drm_client *client;
	28
	29	client = kzalloc(sizeof(*client), GFP_KERNEL);
	30	if (!client)
	31	return -ENOMEM;
	32
	33	INIT_LIST_HEAD(&client->list);
	34	client->np = of_node_get(np);
	35
	36	list_add_tail(&client->list, &host1x->drm_clients);
	37
	38	return 0;
	39	}
	40
c89c0ea6	41	static int host1x_activate_drm_client(struct host1x_drm *host1x,
d8f4a9ed TR	42	struct host1x_drm_client *drm,
	43	struct host1x_client *client)
	44	{
	45	mutex_lock(&host1x->drm_clients_lock);
	46	list_del_init(&drm->list);
	47	list_add_tail(&drm->list, &host1x->drm_active);
	48	drm->client = client;
	49	mutex_unlock(&host1x->drm_clients_lock);
	50
	51	return 0;
	52	}
	53
c89c0ea6	54	static int host1x_remove_drm_client(struct host1x_drm *host1x,
d8f4a9ed TR	55	struct host1x_drm_client *client)
	56	{
	57	mutex_lock(&host1x->drm_clients_lock);
	58	list_del_init(&client->list);
	59	mutex_unlock(&host1x->drm_clients_lock);
	60
	61	of_node_put(client->np);
	62	kfree(client);
	63
	64	return 0;
	65	}
	66
c89c0ea6	67	static int host1x_parse_dt(struct host1x_drm *host1x)
d8f4a9ed TR	68	{
	69	static const char * const compat[] = {
	70	"nvidia,tegra20-dc",
edec4af4	71	"nvidia,tegra20-hdmi",
219e8153 TR	72	"nvidia,tegra30-dc",
219e8153 TR	73	"nvidia,tegra30-hdmi",
d8f4a9ed TR	74	};
	75	unsigned int i;
	76	int err;
	77
	78	for (i = 0; i < ARRAY_SIZE(compat); i++) {
	79	struct device_node *np;
	80
	81	for_each_child_of_node(host1x->dev->of_node, np) {
	82	if (of_device_is_compatible(np, compat[i]) &&
	83	of_device_is_available(np)) {
	84	err = host1x_add_drm_client(host1x, np);
	85	if (err < 0)
	86	return err;
	87	}
	88	}
	89	}
	90
	91	return 0;
	92	}
	93
	94	static int tegra_host1x_probe(struct platform_device *pdev)
	95	{
c89c0ea6	96	struct host1x_drm *host1x;
d8f4a9ed TR	97	struct resource *regs;
	98	int err;
	99
	100	host1x = devm_kzalloc(&pdev->dev, sizeof(*host1x), GFP_KERNEL);
	101	if (!host1x)
	102	return -ENOMEM;
	103
	104	mutex_init(&host1x->drm_clients_lock);
	105	INIT_LIST_HEAD(&host1x->drm_clients);
	106	INIT_LIST_HEAD(&host1x->drm_active);
	107	mutex_init(&host1x->clients_lock);
	108	INIT_LIST_HEAD(&host1x->clients);
	109	host1x->dev = &pdev->dev;
	110
	111	err = host1x_parse_dt(host1x);
	112	if (err < 0) {
	113	dev_err(&pdev->dev, "failed to parse DT: %d\n", err);
	114	return err;
	115	}
	116
	117	host1x->clk = devm_clk_get(&pdev->dev, NULL);
	118	if (IS_ERR(host1x->clk))
	119	return PTR_ERR(host1x->clk);
	120
	121	err = clk_prepare_enable(host1x->clk);
	122	if (err < 0)
	123	return err;
	124
	125	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	126	if (!regs) {
	127	err = -ENXIO;
	128	goto err;
	129	}
	130
	131	err = platform_get_irq(pdev, 0);
	132	if (err < 0)
	133	goto err;
	134
	135	host1x->syncpt = err;
	136
	137	err = platform_get_irq(pdev, 1);
	138	if (err < 0)
	139	goto err;
	140
	141	host1x->irq = err;
	142
d4ed6025 TR	143	host1x->regs = devm_ioremap_resource(&pdev->dev, regs);
	144	if (IS_ERR(host1x->regs)) {
	145	err = PTR_ERR(host1x->regs);
d8f4a9ed TR	146	goto err;
	147	}
	148
	149	platform_set_drvdata(pdev, host1x);
	150
	151	return 0;
	152
	153	err:
	154	clk_disable_unprepare(host1x->clk);
	155	return err;
	156	}
	157
	158	static int tegra_host1x_remove(struct platform_device *pdev)
	159	{
c89c0ea6	160	struct host1x_drm *host1x = platform_get_drvdata(pdev);
d8f4a9ed TR	161
	162	clk_disable_unprepare(host1x->clk);
	163
	164	return 0;
	165	}
	166
c89c0ea6	167	int host1x_drm_init(struct host1x_drm host1x, struct drm_device drm)
d8f4a9ed TR	168	{
	169	struct host1x_client *client;
	170
	171	mutex_lock(&host1x->clients_lock);
	172
	173	list_for_each_entry(client, &host1x->clients, list) {
	174	if (client->ops && client->ops->drm_init) {
	175	int err = client->ops->drm_init(client, drm);
	176	if (err < 0) {
	177	dev_err(host1x->dev,
	178	"DRM setup failed for %s: %d\n",
	179	dev_name(client->dev), err);
	180	return err;
	181	}
	182	}
	183	}
	184
	185	mutex_unlock(&host1x->clients_lock);
	186
	187	return 0;
	188	}
	189
c89c0ea6	190	int host1x_drm_exit(struct host1x_drm *host1x)
d8f4a9ed TR	191	{
	192	struct platform_device *pdev = to_platform_device(host1x->dev);
	193	struct host1x_client *client;
	194
	195	if (!host1x->drm)
	196	return 0;
	197
	198	mutex_lock(&host1x->clients_lock);
	199
	200	list_for_each_entry_reverse(client, &host1x->clients, list) {
	201	if (client->ops && client->ops->drm_exit) {
	202	int err = client->ops->drm_exit(client);
	203	if (err < 0) {
	204	dev_err(host1x->dev,
	205	"DRM cleanup failed for %s: %d\n",
	206	dev_name(client->dev), err);
	207	return err;
	208	}
	209	}
	210	}
	211
	212	mutex_unlock(&host1x->clients_lock);
	213
	214	drm_platform_exit(&tegra_drm_driver, pdev);
	215	host1x->drm = NULL;
	216
	217	return 0;
	218	}
	219
c89c0ea6 AM	220	int host1x_register_client(struct host1x_drm *host1x,
c89c0ea6 AM	221	struct host1x_client *client)
d8f4a9ed TR	222	{
	223	struct host1x_drm_client drm, tmp;
	224	int err;
	225
	226	mutex_lock(&host1x->clients_lock);
	227	list_add_tail(&client->list, &host1x->clients);
	228	mutex_unlock(&host1x->clients_lock);
	229
	230	list_for_each_entry_safe(drm, tmp, &host1x->drm_clients, list)
	231	if (drm->np == client->dev->of_node)
	232	host1x_activate_drm_client(host1x, drm, client);
	233
	234	if (list_empty(&host1x->drm_clients)) {
	235	struct platform_device *pdev = to_platform_device(host1x->dev);
	236
	237	err = drm_platform_init(&tegra_drm_driver, pdev);
	238	if (err < 0) {
	239	dev_err(host1x->dev, "drm_platform_init(): %d\n", err);
	240	return err;
	241	}
	242	}
	243
4026bfb3 LS	244	client->host1x = host1x;
4026bfb3 LS	245
d8f4a9ed TR	246	return 0;
	247	}
	248
c89c0ea6	249	int host1x_unregister_client(struct host1x_drm *host1x,
d8f4a9ed TR	250	struct host1x_client *client)
	251	{
	252	struct host1x_drm_client drm, tmp;
	253	int err;
	254
	255	list_for_each_entry_safe(drm, tmp, &host1x->drm_active, list) {
	256	if (drm->client == client) {
	257	err = host1x_drm_exit(host1x);
	258	if (err < 0) {
	259	dev_err(host1x->dev, "host1x_drm_exit(): %d\n",
	260	err);
	261	return err;
	262	}
	263
	264	host1x_remove_drm_client(host1x, drm);
	265	break;
	266	}
	267	}
	268
	269	mutex_lock(&host1x->clients_lock);
	270	list_del_init(&client->list);
	271	mutex_unlock(&host1x->clients_lock);
	272
	273	return 0;
	274	}
	275
	276	static struct of_device_id tegra_host1x_of_match[] = {
219e8153	277	{ .compatible = "nvidia,tegra30-host1x", },
d8f4a9ed TR	278	{ .compatible = "nvidia,tegra20-host1x", },
	279	{ },
	280	};
	281	MODULE_DEVICE_TABLE(of, tegra_host1x_of_match);
	282
	283	struct platform_driver tegra_host1x_driver = {
	284	.driver = {
	285	.name = "tegra-host1x",
	286	.owner = THIS_MODULE,
	287	.of_match_table = tegra_host1x_of_match,
	288	},
	289	.probe = tegra_host1x_probe,
	290	.remove = tegra_host1x_remove,
	291	};
	292
	293	static int __init tegra_host1x_init(void)
	294	{
	295	int err;
	296
	297	err = platform_driver_register(&tegra_host1x_driver);
	298	if (err < 0)
	299	return err;
	300
	301	err = platform_driver_register(&tegra_dc_driver);
	302	if (err < 0)
	303	goto unregister_host1x;
	304
edec4af4 TR	305	err = platform_driver_register(&tegra_hdmi_driver);
	306	if (err < 0)
	307	goto unregister_dc;
	308
d8f4a9ed TR	309	return 0;
d8f4a9ed TR	310
edec4af4 TR	311	unregister_dc:
edec4af4 TR	312	platform_driver_unregister(&tegra_dc_driver);
d8f4a9ed TR	313	unregister_host1x:
	314	platform_driver_unregister(&tegra_host1x_driver);
	315	return err;
	316	}
	317	module_init(tegra_host1x_init);
	318
	319	static void __exit tegra_host1x_exit(void)
	320	{
edec4af4	321	platform_driver_unregister(&tegra_hdmi_driver);
d8f4a9ed TR	322	platform_driver_unregister(&tegra_dc_driver);
	323	platform_driver_unregister(&tegra_host1x_driver);
	324	}
	325	module_exit(tegra_host1x_exit);
	326
	327	MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
	328	MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
	329	MODULE_LICENSE("GPL");