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 <drm/drm_of.h>
  15 #include "armada_crtc.h"
  16 #include "armada_drm.h"
  17 #include "armada_gem.h"
  18 #include "armada_hw.h"
  19 #include <drm/armada_drm.h>
  20 #include "armada_ioctlP.h"
  21
  22 static void armada_drm_unref_work(struct work_struct *work)
  23 {
  24         struct armada_private *priv =
  25                 container_of(work, struct armada_private, fb_unref_work);
  26         struct drm_framebuffer *fb;
  27
  28         while (kfifo_get(&priv->fb_unref, &fb))
  29                 drm_framebuffer_unreference(fb);
  30 }
  31
  32 /* Must be called with dev->event_lock held */
  33 void __armada_drm_queue_unref_work(struct drm_device *dev,
  34         struct drm_framebuffer *fb)
  35 {
  36         struct armada_private *priv = dev->dev_private;
  37
  38         WARN_ON(!kfifo_put(&priv->fb_unref, fb));
  39         schedule_work(&priv->fb_unref_work);
  40 }
  41
  42 void armada_drm_queue_unref_work(struct drm_device *dev,
  43         struct drm_framebuffer *fb)
  44 {
  45         unsigned long flags;
  46
  47         spin_lock_irqsave(&dev->event_lock, flags);
  48         __armada_drm_queue_unref_work(dev, fb);
  49         spin_unlock_irqrestore(&dev->event_lock, flags);
  50 }
  51
  52 static struct drm_ioctl_desc armada_ioctls[] = {
  53         DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
  54         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
  55         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
  56 };
  57
  58 static void armada_drm_lastclose(struct drm_device *dev)
  59 {
  60         armada_fbdev_lastclose(dev);
  61 }
  62
  63 DEFINE_DRM_GEM_FOPS(armada_drm_fops);
  64
  65 static struct drm_driver armada_drm_driver = {
  66         .lastclose              = armada_drm_lastclose,
  67         .gem_free_object_unlocked = armada_gem_free_object,
  68         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  69         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  70         .gem_prime_export       = armada_gem_prime_export,
  71         .gem_prime_import       = armada_gem_prime_import,
  72         .dumb_create            = armada_gem_dumb_create,
  73         .dumb_map_offset        = armada_gem_dumb_map_offset,
  74         .dumb_destroy           = armada_gem_dumb_destroy,
  75         .gem_vm_ops             = &armada_gem_vm_ops,
  76         .major                  = 1,
  77         .minor                  = 0,
  78         .name                   = "armada-drm",
  79         .desc                   = "Armada SoC DRM",
  80         .date                   = "20120730",
  81         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
  82                                   DRIVER_PRIME,
  83         .ioctls                 = armada_ioctls,
  84         .fops                   = &armada_drm_fops,
  85 };
  86
  87 static int armada_drm_bind(struct device *dev)
  88 {
  89         struct armada_private *priv;
  90         struct resource *mem = NULL;
  91         int ret, n;
  92
  93         for (n = 0; ; n++) {
  94                 struct resource *r = platform_get_resource(to_platform_device(dev),
  95                                                            IORESOURCE_MEM, n);
  96                 if (!r)
  97                         break;
  98
  99                 /* Resources above 64K are graphics memory */
 100                 if (resource_size(r) > SZ_64K)
 101                         mem = r;
 102                 else
 103                         return -EINVAL;
 104         }
 105
 106         if (!mem)
 107                 return -ENXIO;
 108
 109         if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
 110                                      "armada-drm"))
 111                 return -EBUSY;
 112
 113         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 114         if (!priv)
 115                 return -ENOMEM;
 116
 117         /*
 118          * The drm_device structure must be at the start of
 119          * armada_private for drm_dev_unref() to work correctly.
 120          */
 121         BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
 122
 123         ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
 124         if (ret) {
 125                 dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
 126                         __func__, ret);
 127                 kfree(priv);
 128                 return ret;
 129         }
 130
 131         priv->drm.dev_private = priv;
 132
 133         dev_set_drvdata(dev, &priv->drm);
 134
 135         INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
 136         INIT_KFIFO(priv->fb_unref);
 137
 138         /* Mode setting support */
 139         drm_mode_config_init(&priv->drm);
 140         priv->drm.mode_config.min_width = 320;
 141         priv->drm.mode_config.min_height = 200;
 142
 143         /*
 144          * With vscale enabled, the maximum width is 1920 due to the
 145          * 1920 by 3 lines RAM
 146          */
 147         priv->drm.mode_config.max_width = 1920;
 148         priv->drm.mode_config.max_height = 2048;
 149
 150         priv->drm.mode_config.preferred_depth = 24;
 151         priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
 152         drm_mm_init(&priv->linear, mem->start, resource_size(mem));
 153         mutex_init(&priv->linear_lock);
 154
 155         ret = component_bind_all(dev, &priv->drm);
 156         if (ret)
 157                 goto err_kms;
 158
 159         ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
 160         if (ret)
 161                 goto err_comp;
 162
 163         priv->drm.irq_enabled = true;
 164
 165         ret = armada_fbdev_init(&priv->drm);
 166         if (ret)
 167                 goto err_comp;
 168
 169         drm_kms_helper_poll_init(&priv->drm);
 170
 171         ret = drm_dev_register(&priv->drm, 0);
 172         if (ret)
 173                 goto err_poll;
 174
 175 #ifdef CONFIG_DEBUG_FS
 176         armada_drm_debugfs_init(priv->drm.primary);
 177 #endif
 178
 179         return 0;
 180
 181  err_poll:
 182         drm_kms_helper_poll_fini(&priv->drm);
 183         armada_fbdev_fini(&priv->drm);
 184  err_comp:
 185         component_unbind_all(dev, &priv->drm);
 186  err_kms:
 187         drm_mode_config_cleanup(&priv->drm);
 188         drm_mm_takedown(&priv->linear);
 189         flush_work(&priv->fb_unref_work);
 190         drm_dev_unref(&priv->drm);
 191         return ret;
 192 }
 193
 194 static void armada_drm_unbind(struct device *dev)
 195 {
 196         struct drm_device *drm = dev_get_drvdata(dev);
 197         struct armada_private *priv = drm->dev_private;
 198
 199         drm_kms_helper_poll_fini(&priv->drm);
 200         armada_fbdev_fini(&priv->drm);
 201
 202         drm_dev_unregister(&priv->drm);
 203
 204         component_unbind_all(dev, &priv->drm);
 205
 206         drm_mode_config_cleanup(&priv->drm);
 207         drm_mm_takedown(&priv->linear);
 208         flush_work(&priv->fb_unref_work);
 209
 210         drm_dev_unref(&priv->drm);
 211 }
 212
 213 static int compare_of(struct device *dev, void *data)
 214 {
 215         return dev->of_node == data;
 216 }
 217
 218 static int compare_dev_name(struct device *dev, void *data)
 219 {
 220         const char *name = data;
 221         return !strcmp(dev_name(dev), name);
 222 }
 223
 224 static void armada_add_endpoints(struct device *dev,
 225         struct component_match **match, struct device_node *port)
 226 {
 227         struct device_node *ep, *remote;
 228
 229         for_each_child_of_node(port, ep) {
 230                 remote = of_graph_get_remote_port_parent(ep);
 231                 if (!remote || !of_device_is_available(remote)) {
 232                         of_node_put(remote);
 233                         continue;
 234                 } else if (!of_device_is_available(remote->parent)) {
 235                         dev_warn(dev, "parent device of %pOF is not available\n",
 236                                  remote);
 237                         of_node_put(remote);
 238                         continue;
 239                 }
 240
 241                 drm_of_component_match_add(dev, match, compare_of, remote);
 242                 of_node_put(remote);
 243         }
 244 }
 245
 246 static const struct component_master_ops armada_master_ops = {
 247         .bind = armada_drm_bind,
 248         .unbind = armada_drm_unbind,
 249 };
 250
 251 static int armada_drm_probe(struct platform_device *pdev)
 252 {
 253         struct component_match *match = NULL;
 254         struct device *dev = &pdev->dev;
 255         int ret;
 256
 257         ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
 258         if (ret != -EINVAL)
 259                 return ret;
 260
 261         if (dev->platform_data) {
 262                 char **devices = dev->platform_data;
 263                 struct device_node *port;
 264                 struct device *d;
 265                 int i;
 266
 267                 for (i = 0; devices[i]; i++)
 268                         component_match_add(dev, &match, compare_dev_name,
 269                                             devices[i]);
 270
 271                 if (i == 0) {
 272                         dev_err(dev, "missing 'ports' property\n");
 273                         return -ENODEV;
 274                 }
 275
 276                 for (i = 0; devices[i]; i++) {
 277                         d = bus_find_device_by_name(&platform_bus_type, NULL,
 278                                                     devices[i]);
 279                         if (d && d->of_node) {
 280                                 for_each_child_of_node(d->of_node, port)
 281                                         armada_add_endpoints(dev, &match, port);
 282                         }
 283                         put_device(d);
 284                 }
 285         }
 286
 287         return component_master_add_with_match(&pdev->dev, &armada_master_ops,
 288                                                match);
 289 }
 290
 291 static int armada_drm_remove(struct platform_device *pdev)
 292 {
 293         component_master_del(&pdev->dev, &armada_master_ops);
 294         return 0;
 295 }
 296
 297 static const struct platform_device_id armada_drm_platform_ids[] = {
 298         {
 299                 .name           = "armada-drm",
 300         }, {
 301                 .name           = "armada-510-drm",
 302         },
 303         { },
 304 };
 305 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 306
 307 static struct platform_driver armada_drm_platform_driver = {
 308         .probe  = armada_drm_probe,
 309         .remove = armada_drm_remove,
 310         .driver = {
 311                 .name   = "armada-drm",
 312         },
 313         .id_table = armada_drm_platform_ids,
 314 };
 315
 316 static int __init armada_drm_init(void)
 317 {
 318         int ret;
 319
 320         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 321
 322         ret = platform_driver_register(&armada_lcd_platform_driver);
 323         if (ret)
 324                 return ret;
 325         ret = platform_driver_register(&armada_drm_platform_driver);
 326         if (ret)
 327                 platform_driver_unregister(&armada_lcd_platform_driver);
 328         return ret;
 329 }
 330 module_init(armada_drm_init);
 331
 332 static void __exit armada_drm_exit(void)
 333 {
 334         platform_driver_unregister(&armada_drm_platform_driver);
 335         platform_driver_unregister(&armada_lcd_platform_driver);
 336 }
 337 module_exit(armada_drm_exit);
 338
 339 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 340 MODULE_DESCRIPTION("Armada DRM Driver");
 341 MODULE_LICENSE("GPL");
 342 MODULE_ALIAS("platform:armada-drm");