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