drivers/gpu/drm/armada/armada_drv.c

   1 /*
   2  * Copyright (C) 2012 Russell King
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/clk.h>
   9 #include <linux/component.h>
  10 #include <linux/module.h>
  11 #include <linux/of_graph.h>
  12 #include <drm/drmP.h>
  13 #include <drm/drm_crtc_helper.h>
  14 #include "armada_crtc.h"
  15 #include "armada_drm.h"
  16 #include "armada_gem.h"
  17 #include "armada_hw.h"
  18 #include <drm/armada_drm.h>
  19 #include "armada_ioctlP.h"
  20
  21 static void armada_drm_unref_work(struct work_struct *work)
  22 {
  23         struct armada_private *priv =
  24                 container_of(work, struct armada_private, fb_unref_work);
  25         struct drm_framebuffer *fb;
  26
  27         while (kfifo_get(&priv->fb_unref, &fb))
  28                 drm_framebuffer_unreference(fb);
  29 }
  30
  31 /* Must be called with dev->event_lock held */
  32 void __armada_drm_queue_unref_work(struct drm_device *dev,
  33         struct drm_framebuffer *fb)
  34 {
  35         struct armada_private *priv = dev->dev_private;
  36
  37         WARN_ON(!kfifo_put(&priv->fb_unref, fb));
  38         schedule_work(&priv->fb_unref_work);
  39 }
  40
  41 void armada_drm_queue_unref_work(struct drm_device *dev,
  42         struct drm_framebuffer *fb)
  43 {
  44         unsigned long flags;
  45
  46         spin_lock_irqsave(&dev->event_lock, flags);
  47         __armada_drm_queue_unref_work(dev, fb);
  48         spin_unlock_irqrestore(&dev->event_lock, flags);
  49 }
  50
  51 static int armada_drm_load(struct drm_device *dev, unsigned long flags)
  52 {
  53         struct armada_private *priv;
  54         struct resource *mem = NULL;
  55         int ret, n;
  56
  57         for (n = 0; ; n++) {
  58                 struct resource *r = platform_get_resource(dev->platformdev,
  59                                                            IORESOURCE_MEM, n);
  60                 if (!r)
  61                         break;
  62
  63                 /* Resources above 64K are graphics memory */
  64                 if (resource_size(r) > SZ_64K)
  65                         mem = r;
  66                 else
  67                         return -EINVAL;
  68         }
  69
  70         if (!mem)
  71                 return -ENXIO;
  72
  73         if (!devm_request_mem_region(dev->dev, mem->start,
  74                         resource_size(mem), "armada-drm"))
  75                 return -EBUSY;
  76
  77         priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
  78         if (!priv) {
  79                 DRM_ERROR("failed to allocate private\n");
  80                 return -ENOMEM;
  81         }
  82
  83         platform_set_drvdata(dev->platformdev, dev);
  84         dev->dev_private = priv;
  85
  86         INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
  87         INIT_KFIFO(priv->fb_unref);
  88
  89         /* Mode setting support */
  90         drm_mode_config_init(dev);
  91         dev->mode_config.min_width = 320;
  92         dev->mode_config.min_height = 200;
  93
  94         /*
  95          * With vscale enabled, the maximum width is 1920 due to the
  96          * 1920 by 3 lines RAM
  97          */
  98         dev->mode_config.max_width = 1920;
  99         dev->mode_config.max_height = 2048;
 100
 101         dev->mode_config.preferred_depth = 24;
 102         dev->mode_config.funcs = &armada_drm_mode_config_funcs;
 103         drm_mm_init(&priv->linear, mem->start, resource_size(mem));
 104
 105         ret = component_bind_all(dev->dev, dev);
 106         if (ret)
 107                 goto err_kms;
 108
 109         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 110         if (ret)
 111                 goto err_comp;
 112
 113         dev->irq_enabled = true;
 114         dev->vblank_disable_allowed = 1;
 115
 116         ret = armada_fbdev_init(dev);
 117         if (ret)
 118                 goto err_comp;
 119
 120         drm_kms_helper_poll_init(dev);
 121
 122         return 0;
 123
 124  err_comp:
 125         component_unbind_all(dev->dev, dev);
 126  err_kms:
 127         drm_mode_config_cleanup(dev);
 128         drm_mm_takedown(&priv->linear);
 129         flush_work(&priv->fb_unref_work);
 130
 131         return ret;
 132 }
 133
 134 static int armada_drm_unload(struct drm_device *dev)
 135 {
 136         struct armada_private *priv = dev->dev_private;
 137
 138         drm_kms_helper_poll_fini(dev);
 139         armada_fbdev_fini(dev);
 140
 141         component_unbind_all(dev->dev, dev);
 142
 143         drm_mode_config_cleanup(dev);
 144         drm_mm_takedown(&priv->linear);
 145         flush_work(&priv->fb_unref_work);
 146         dev->dev_private = NULL;
 147
 148         return 0;
 149 }
 150
 151 /* These are called under the vbl_lock. */
 152 static int armada_drm_enable_vblank(struct drm_device *dev, int crtc)
 153 {
 154         struct armada_private *priv = dev->dev_private;
 155         armada_drm_crtc_enable_irq(priv->dcrtc[crtc], VSYNC_IRQ_ENA);
 156         return 0;
 157 }
 158
 159 static void armada_drm_disable_vblank(struct drm_device *dev, int crtc)
 160 {
 161         struct armada_private *priv = dev->dev_private;
 162         armada_drm_crtc_disable_irq(priv->dcrtc[crtc], VSYNC_IRQ_ENA);
 163 }
 164
 165 static struct drm_ioctl_desc armada_ioctls[] = {
 166         DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,
 167                 DRM_UNLOCKED),
 168         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl,
 169                 DRM_UNLOCKED),
 170         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl,
 171                 DRM_UNLOCKED),
 172 };
 173
 174 static void armada_drm_lastclose(struct drm_device *dev)
 175 {
 176         armada_fbdev_lastclose(dev);
 177 }
 178
 179 static const struct file_operations armada_drm_fops = {
 180         .owner                  = THIS_MODULE,
 181         .llseek                 = no_llseek,
 182         .read                   = drm_read,
 183         .poll                   = drm_poll,
 184         .unlocked_ioctl         = drm_ioctl,
 185         .mmap                   = drm_gem_mmap,
 186         .open                   = drm_open,
 187         .release                = drm_release,
 188 };
 189
 190 static struct drm_driver armada_drm_driver = {
 191         .load                   = armada_drm_load,
 192         .open                   = NULL,
 193         .preclose               = NULL,
 194         .postclose              = NULL,
 195         .lastclose              = armada_drm_lastclose,
 196         .unload                 = armada_drm_unload,
 197         .set_busid              = drm_platform_set_busid,
 198         .get_vblank_counter     = drm_vblank_count,
 199         .enable_vblank          = armada_drm_enable_vblank,
 200         .disable_vblank         = armada_drm_disable_vblank,
 201 #ifdef CONFIG_DEBUG_FS
 202         .debugfs_init           = armada_drm_debugfs_init,
 203         .debugfs_cleanup        = armada_drm_debugfs_cleanup,
 204 #endif
 205         .gem_free_object        = armada_gem_free_object,
 206         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 207         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 208         .gem_prime_export       = armada_gem_prime_export,
 209         .gem_prime_import       = armada_gem_prime_import,
 210         .dumb_create            = armada_gem_dumb_create,
 211         .dumb_map_offset        = armada_gem_dumb_map_offset,
 212         .dumb_destroy           = armada_gem_dumb_destroy,
 213         .gem_vm_ops             = &armada_gem_vm_ops,
 214         .major                  = 1,
 215         .minor                  = 0,
 216         .name                   = "armada-drm",
 217         .desc                   = "Armada SoC DRM",
 218         .date                   = "20120730",
 219         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 220                                   DRIVER_HAVE_IRQ | DRIVER_PRIME,
 221         .ioctls                 = armada_ioctls,
 222         .fops                   = &armada_drm_fops,
 223 };
 224
 225 static int armada_drm_bind(struct device *dev)
 226 {
 227         return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
 228 }
 229
 230 static void armada_drm_unbind(struct device *dev)
 231 {
 232         drm_put_dev(dev_get_drvdata(dev));
 233 }
 234
 235 static int compare_of(struct device *dev, void *data)
 236 {
 237         return dev->of_node == data;
 238 }
 239
 240 static int compare_dev_name(struct device *dev, void *data)
 241 {
 242         const char *name = data;
 243         return !strcmp(dev_name(dev), name);
 244 }
 245
 246 static void armada_add_endpoints(struct device *dev,
 247         struct component_match **match, struct device_node *port)
 248 {
 249         struct device_node *ep, *remote;
 250
 251         for_each_child_of_node(port, ep) {
 252                 remote = of_graph_get_remote_port_parent(ep);
 253                 if (!remote || !of_device_is_available(remote)) {
 254                         of_node_put(remote);
 255                         continue;
 256                 } else if (!of_device_is_available(remote->parent)) {
 257                         dev_warn(dev, "parent device of %s is not available\n",
 258                                  remote->full_name);
 259                         of_node_put(remote);
 260                         continue;
 261                 }
 262
 263                 component_match_add(dev, match, compare_of, remote);
 264                 of_node_put(remote);
 265         }
 266 }
 267
 268 static int armada_drm_find_components(struct device *dev,
 269         struct component_match **match)
 270 {
 271         struct device_node *port;
 272         int i;
 273
 274         if (dev->of_node) {
 275                 struct device_node *np = dev->of_node;
 276
 277                 for (i = 0; ; i++) {
 278                         port = of_parse_phandle(np, "ports", i);
 279                         if (!port)
 280                                 break;
 281
 282                         component_match_add(dev, match, compare_of, port);
 283                         of_node_put(port);
 284                 }
 285
 286                 if (i == 0) {
 287                         dev_err(dev, "missing 'ports' property\n");
 288                         return -ENODEV;
 289                 }
 290
 291                 for (i = 0; ; i++) {
 292                         port = of_parse_phandle(np, "ports", i);
 293                         if (!port)
 294                                 break;
 295
 296                         armada_add_endpoints(dev, match, port);
 297                         of_node_put(port);
 298                 }
 299         } else if (dev->platform_data) {
 300                 char **devices = dev->platform_data;
 301                 struct device *d;
 302
 303                 for (i = 0; devices[i]; i++)
 304                         component_match_add(dev, match, compare_dev_name,
 305                                             devices[i]);
 306
 307                 if (i == 0) {
 308                         dev_err(dev, "missing 'ports' property\n");
 309                         return -ENODEV;
 310                 }
 311
 312                 for (i = 0; devices[i]; i++) {
 313                         d = bus_find_device_by_name(&platform_bus_type, NULL,
 314                                         devices[i]);
 315                         if (d && d->of_node) {
 316                                 for_each_child_of_node(d->of_node, port)
 317                                         armada_add_endpoints(dev, match, port);
 318                         }
 319                         put_device(d);
 320                 }
 321         }
 322
 323         return 0;
 324 }
 325
 326 static const struct component_master_ops armada_master_ops = {
 327         .bind = armada_drm_bind,
 328         .unbind = armada_drm_unbind,
 329 };
 330
 331 static int armada_drm_probe(struct platform_device *pdev)
 332 {
 333         struct component_match *match = NULL;
 334         int ret;
 335
 336         ret = armada_drm_find_components(&pdev->dev, &match);
 337         if (ret < 0)
 338                 return ret;
 339
 340         return component_master_add_with_match(&pdev->dev, &armada_master_ops,
 341                                                match);
 342 }
 343
 344 static int armada_drm_remove(struct platform_device *pdev)
 345 {
 346         component_master_del(&pdev->dev, &armada_master_ops);
 347         return 0;
 348 }
 349
 350 static const struct platform_device_id armada_drm_platform_ids[] = {
 351         {
 352                 .name           = "armada-drm",
 353         }, {
 354                 .name           = "armada-510-drm",
 355         },
 356         { },
 357 };
 358 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 359
 360 static struct platform_driver armada_drm_platform_driver = {
 361         .probe  = armada_drm_probe,
 362         .remove = armada_drm_remove,
 363         .driver = {
 364                 .name   = "armada-drm",
 365         },
 366         .id_table = armada_drm_platform_ids,
 367 };
 368
 369 static int __init armada_drm_init(void)
 370 {
 371         int ret;
 372
 373         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 374
 375         ret = platform_driver_register(&armada_lcd_platform_driver);
 376         if (ret)
 377                 return ret;
 378         ret = platform_driver_register(&armada_drm_platform_driver);
 379         if (ret)
 380                 platform_driver_unregister(&armada_lcd_platform_driver);
 381         return ret;
 382 }
 383 module_init(armada_drm_init);
 384
 385 static void __exit armada_drm_exit(void)
 386 {
 387         platform_driver_unregister(&armada_drm_platform_driver);
 388         platform_driver_unregister(&armada_lcd_platform_driver);
 389 }
 390 module_exit(armada_drm_exit);
 391
 392 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 393 MODULE_DESCRIPTION("Armada DRM Driver");
 394 MODULE_LICENSE("GPL");
 395 MODULE_ALIAS("platform:armada-drm");