drivers/gpu/drm/tegra/host1x.c

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