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 /* These are called under the vbl_lock. */
  53 static int armada_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
  54 {
  55         struct armada_private *priv = dev->dev_private;
  56         armada_drm_crtc_enable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
  57         return 0;
  58 }
  59
  60 static void armada_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
  61 {
  62         struct armada_private *priv = dev->dev_private;
  63         armada_drm_crtc_disable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
  64 }
  65
  66 static struct drm_ioctl_desc armada_ioctls[] = {
  67         DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
  68         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
  69         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
  70 };
  71
  72 static void armada_drm_lastclose(struct drm_device *dev)
  73 {
  74         armada_fbdev_lastclose(dev);
  75 }
  76
  77 static const struct file_operations armada_drm_fops = {
  78         .owner                  = THIS_MODULE,
  79         .llseek                 = no_llseek,
  80         .read                   = drm_read,
  81         .poll                   = drm_poll,
  82         .unlocked_ioctl         = drm_ioctl,
  83         .mmap                   = drm_gem_mmap,
  84         .open                   = drm_open,
  85         .release                = drm_release,
  86 };
  87
  88 static struct drm_driver armada_drm_driver = {
  89         .lastclose              = armada_drm_lastclose,
  90         .get_vblank_counter     = drm_vblank_no_hw_counter,
  91         .enable_vblank          = armada_drm_enable_vblank,
  92         .disable_vblank         = armada_drm_disable_vblank,
  93         .gem_free_object_unlocked = armada_gem_free_object,
  94         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  95         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  96         .gem_prime_export       = armada_gem_prime_export,
  97         .gem_prime_import       = armada_gem_prime_import,
  98         .dumb_create            = armada_gem_dumb_create,
  99         .dumb_map_offset        = armada_gem_dumb_map_offset,
 100         .dumb_destroy           = armada_gem_dumb_destroy,
 101         .gem_vm_ops             = &armada_gem_vm_ops,
 102         .major                  = 1,
 103         .minor                  = 0,
 104         .name                   = "armada-drm",
 105         .desc                   = "Armada SoC DRM",
 106         .date                   = "20120730",
 107         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 108                                   DRIVER_PRIME,
 109         .ioctls                 = armada_ioctls,
 110         .fops                   = &armada_drm_fops,
 111 };
 112
 113 static int armada_drm_bind(struct device *dev)
 114 {
 115         struct armada_private *priv;
 116         struct resource *mem = NULL;
 117         int ret, n;
 118
 119         for (n = 0; ; n++) {
 120                 struct resource *r = platform_get_resource(to_platform_device(dev),
 121                                                            IORESOURCE_MEM, n);
 122                 if (!r)
 123                         break;
 124
 125                 /* Resources above 64K are graphics memory */
 126                 if (resource_size(r) > SZ_64K)
 127                         mem = r;
 128                 else
 129                         return -EINVAL;
 130         }
 131
 132         if (!mem)
 133                 return -ENXIO;
 134
 135         if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
 136                                      "armada-drm"))
 137                 return -EBUSY;
 138
 139         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 140         if (!priv)
 141                 return -ENOMEM;
 142
 143         /*
 144          * The drm_device structure must be at the start of
 145          * armada_private for drm_dev_unref() to work correctly.
 146          */
 147         BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
 148
 149         ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
 150         if (ret) {
 151                 dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
 152                         __func__, ret);
 153                 kfree(priv);
 154                 return ret;
 155         }
 156
 157         priv->drm.platformdev = to_platform_device(dev);
 158         priv->drm.dev_private = priv;
 159
 160         platform_set_drvdata(priv->drm.platformdev, &priv->drm);
 161
 162         INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
 163         INIT_KFIFO(priv->fb_unref);
 164
 165         /* Mode setting support */
 166         drm_mode_config_init(&priv->drm);
 167         priv->drm.mode_config.min_width = 320;
 168         priv->drm.mode_config.min_height = 200;
 169
 170         /*
 171          * With vscale enabled, the maximum width is 1920 due to the
 172          * 1920 by 3 lines RAM
 173          */
 174         priv->drm.mode_config.max_width = 1920;
 175         priv->drm.mode_config.max_height = 2048;
 176
 177         priv->drm.mode_config.preferred_depth = 24;
 178         priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
 179         drm_mm_init(&priv->linear, mem->start, resource_size(mem));
 180         mutex_init(&priv->linear_lock);
 181
 182         ret = component_bind_all(dev, &priv->drm);
 183         if (ret)
 184                 goto err_kms;
 185
 186         ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
 187         if (ret)
 188                 goto err_comp;
 189
 190         priv->drm.irq_enabled = true;
 191
 192         ret = armada_fbdev_init(&priv->drm);
 193         if (ret)
 194                 goto err_comp;
 195
 196         drm_kms_helper_poll_init(&priv->drm);
 197
 198         ret = drm_dev_register(&priv->drm, 0);
 199         if (ret)
 200                 goto err_poll;
 201
 202 #ifdef CONFIG_DEBUG_FS
 203         armada_drm_debugfs_init(priv->drm.primary);
 204 #endif
 205
 206         DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 207                  armada_drm_driver.name, armada_drm_driver.major,
 208                  armada_drm_driver.minor, armada_drm_driver.patchlevel,
 209                  armada_drm_driver.date, dev_name(dev),
 210                  priv->drm.primary->index);
 211
 212         return 0;
 213
 214  err_poll:
 215         drm_kms_helper_poll_fini(&priv->drm);
 216         armada_fbdev_fini(&priv->drm);
 217  err_comp:
 218         component_unbind_all(dev, &priv->drm);
 219  err_kms:
 220         drm_mode_config_cleanup(&priv->drm);
 221         drm_mm_takedown(&priv->linear);
 222         flush_work(&priv->fb_unref_work);
 223         drm_dev_unref(&priv->drm);
 224         return ret;
 225 }
 226
 227 static void armada_drm_unbind(struct device *dev)
 228 {
 229         struct drm_device *drm = dev_get_drvdata(dev);
 230         struct armada_private *priv = drm->dev_private;
 231
 232         drm_kms_helper_poll_fini(&priv->drm);
 233         armada_fbdev_fini(&priv->drm);
 234
 235 #ifdef CONFIG_DEBUG_FS
 236         armada_drm_debugfs_cleanup(priv->drm.primary);
 237 #endif
 238         drm_dev_unregister(&priv->drm);
 239
 240         component_unbind_all(dev, &priv->drm);
 241
 242         drm_mode_config_cleanup(&priv->drm);
 243         drm_mm_takedown(&priv->linear);
 244         flush_work(&priv->fb_unref_work);
 245
 246         drm_dev_unref(&priv->drm);
 247 }
 248
 249 static int compare_of(struct device *dev, void *data)
 250 {
 251         return dev->of_node == data;
 252 }
 253
 254 static int compare_dev_name(struct device *dev, void *data)
 255 {
 256         const char *name = data;
 257         return !strcmp(dev_name(dev), name);
 258 }
 259
 260 static void armada_add_endpoints(struct device *dev,
 261         struct component_match **match, struct device_node *port)
 262 {
 263         struct device_node *ep, *remote;
 264
 265         for_each_child_of_node(port, ep) {
 266                 remote = of_graph_get_remote_port_parent(ep);
 267                 if (!remote || !of_device_is_available(remote)) {
 268                         of_node_put(remote);
 269                         continue;
 270                 } else if (!of_device_is_available(remote->parent)) {
 271                         dev_warn(dev, "parent device of %s is not available\n",
 272                                  remote->full_name);
 273                         of_node_put(remote);
 274                         continue;
 275                 }
 276
 277                 drm_of_component_match_add(dev, match, compare_of, remote);
 278                 of_node_put(remote);
 279         }
 280 }
 281
 282 static const struct component_master_ops armada_master_ops = {
 283         .bind = armada_drm_bind,
 284         .unbind = armada_drm_unbind,
 285 };
 286
 287 static int armada_drm_probe(struct platform_device *pdev)
 288 {
 289         struct component_match *match = NULL;
 290         struct device *dev = &pdev->dev;
 291         int ret;
 292
 293         ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
 294         if (ret != -EINVAL)
 295                 return ret;
 296
 297         if (dev->platform_data) {
 298                 char **devices = dev->platform_data;
 299                 struct device_node *port;
 300                 struct device *d;
 301                 int i;
 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 component_master_add_with_match(&pdev->dev, &armada_master_ops,
 324                                                match);
 325 }
 326
 327 static int armada_drm_remove(struct platform_device *pdev)
 328 {
 329         component_master_del(&pdev->dev, &armada_master_ops);
 330         return 0;
 331 }
 332
 333 static const struct platform_device_id armada_drm_platform_ids[] = {
 334         {
 335                 .name           = "armada-drm",
 336         }, {
 337                 .name           = "armada-510-drm",
 338         },
 339         { },
 340 };
 341 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 342
 343 static struct platform_driver armada_drm_platform_driver = {
 344         .probe  = armada_drm_probe,
 345         .remove = armada_drm_remove,
 346         .driver = {
 347                 .name   = "armada-drm",
 348         },
 349         .id_table = armada_drm_platform_ids,
 350 };
 351
 352 static int __init armada_drm_init(void)
 353 {
 354         int ret;
 355
 356         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 357
 358         ret = platform_driver_register(&armada_lcd_platform_driver);
 359         if (ret)
 360                 return ret;
 361         ret = platform_driver_register(&armada_drm_platform_driver);
 362         if (ret)
 363                 platform_driver_unregister(&armada_lcd_platform_driver);
 364         return ret;
 365 }
 366 module_init(armada_drm_init);
 367
 368 static void __exit armada_drm_exit(void)
 369 {
 370         platform_driver_unregister(&armada_drm_platform_driver);
 371         platform_driver_unregister(&armada_lcd_platform_driver);
 372 }
 373 module_exit(armada_drm_exit);
 374
 375 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 376 MODULE_DESCRIPTION("Armada DRM Driver");
 377 MODULE_LICENSE("GPL");
 378 MODULE_ALIAS("platform:armada-drm");