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, unsigned int pipe)
 153 {
 154         struct armada_private *priv = dev->dev_private;
 155         armada_drm_crtc_enable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
 156         return 0;
 157 }
 158
 159 static void armada_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
 160 {
 161         struct armada_private *priv = dev->dev_private;
 162         armada_drm_crtc_disable_irq(priv->dcrtc[pipe], 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,0),
 167         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
 168         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
 169 };
 170
 171 static void armada_drm_lastclose(struct drm_device *dev)
 172 {
 173         armada_fbdev_lastclose(dev);
 174 }
 175
 176 static const struct file_operations armada_drm_fops = {
 177         .owner                  = THIS_MODULE,
 178         .llseek                 = no_llseek,
 179         .read                   = drm_read,
 180         .poll                   = drm_poll,
 181         .unlocked_ioctl         = drm_ioctl,
 182         .mmap                   = drm_gem_mmap,
 183         .open                   = drm_open,
 184         .release                = drm_release,
 185 };
 186
 187 static struct drm_driver armada_drm_driver = {
 188         .load                   = armada_drm_load,
 189         .open                   = NULL,
 190         .preclose               = NULL,
 191         .postclose              = NULL,
 192         .lastclose              = armada_drm_lastclose,
 193         .unload                 = armada_drm_unload,
 194         .set_busid              = drm_platform_set_busid,
 195         .get_vblank_counter     = drm_vblank_no_hw_counter,
 196         .enable_vblank          = armada_drm_enable_vblank,
 197         .disable_vblank         = armada_drm_disable_vblank,
 198 #ifdef CONFIG_DEBUG_FS
 199         .debugfs_init           = armada_drm_debugfs_init,
 200         .debugfs_cleanup        = armada_drm_debugfs_cleanup,
 201 #endif
 202         .gem_free_object        = armada_gem_free_object,
 203         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 204         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 205         .gem_prime_export       = armada_gem_prime_export,
 206         .gem_prime_import       = armada_gem_prime_import,
 207         .dumb_create            = armada_gem_dumb_create,
 208         .dumb_map_offset        = armada_gem_dumb_map_offset,
 209         .dumb_destroy           = armada_gem_dumb_destroy,
 210         .gem_vm_ops             = &armada_gem_vm_ops,
 211         .major                  = 1,
 212         .minor                  = 0,
 213         .name                   = "armada-drm",
 214         .desc                   = "Armada SoC DRM",
 215         .date                   = "20120730",
 216         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 217                                   DRIVER_HAVE_IRQ | DRIVER_PRIME,
 218         .ioctls                 = armada_ioctls,
 219         .fops                   = &armada_drm_fops,
 220 };
 221
 222 static int armada_drm_bind(struct device *dev)
 223 {
 224         return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
 225 }
 226
 227 static void armada_drm_unbind(struct device *dev)
 228 {
 229         drm_put_dev(dev_get_drvdata(dev));
 230 }
 231
 232 static int compare_of(struct device *dev, void *data)
 233 {
 234         return dev->of_node == data;
 235 }
 236
 237 static int compare_dev_name(struct device *dev, void *data)
 238 {
 239         const char *name = data;
 240         return !strcmp(dev_name(dev), name);
 241 }
 242
 243 static void armada_add_endpoints(struct device *dev,
 244         struct component_match **match, struct device_node *port)
 245 {
 246         struct device_node *ep, *remote;
 247
 248         for_each_child_of_node(port, ep) {
 249                 remote = of_graph_get_remote_port_parent(ep);
 250                 if (!remote || !of_device_is_available(remote)) {
 251                         of_node_put(remote);
 252                         continue;
 253                 } else if (!of_device_is_available(remote->parent)) {
 254                         dev_warn(dev, "parent device of %s is not available\n",
 255                                  remote->full_name);
 256                         of_node_put(remote);
 257                         continue;
 258                 }
 259
 260                 component_match_add(dev, match, compare_of, remote);
 261                 of_node_put(remote);
 262         }
 263 }
 264
 265 static int armada_drm_find_components(struct device *dev,
 266         struct component_match **match)
 267 {
 268         struct device_node *port;
 269         int i;
 270
 271         if (dev->of_node) {
 272                 struct device_node *np = dev->of_node;
 273
 274                 for (i = 0; ; i++) {
 275                         port = of_parse_phandle(np, "ports", i);
 276                         if (!port)
 277                                 break;
 278
 279                         component_match_add(dev, match, compare_of, port);
 280                         of_node_put(port);
 281                 }
 282
 283                 if (i == 0) {
 284                         dev_err(dev, "missing 'ports' property\n");
 285                         return -ENODEV;
 286                 }
 287
 288                 for (i = 0; ; i++) {
 289                         port = of_parse_phandle(np, "ports", i);
 290                         if (!port)
 291                                 break;
 292
 293                         armada_add_endpoints(dev, match, port);
 294                         of_node_put(port);
 295                 }
 296         } else if (dev->platform_data) {
 297                 char **devices = dev->platform_data;
 298                 struct device *d;
 299
 300                 for (i = 0; devices[i]; i++)
 301                         component_match_add(dev, match, compare_dev_name,
 302                                             devices[i]);
 303
 304                 if (i == 0) {
 305                         dev_err(dev, "missing 'ports' property\n");
 306                         return -ENODEV;
 307                 }
 308
 309                 for (i = 0; devices[i]; i++) {
 310                         d = bus_find_device_by_name(&platform_bus_type, NULL,
 311                                         devices[i]);
 312                         if (d && d->of_node) {
 313                                 for_each_child_of_node(d->of_node, port)
 314                                         armada_add_endpoints(dev, match, port);
 315                         }
 316                         put_device(d);
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 static const struct component_master_ops armada_master_ops = {
 324         .bind = armada_drm_bind,
 325         .unbind = armada_drm_unbind,
 326 };
 327
 328 static int armada_drm_probe(struct platform_device *pdev)
 329 {
 330         struct component_match *match = NULL;
 331         int ret;
 332
 333         ret = armada_drm_find_components(&pdev->dev, &match);
 334         if (ret < 0)
 335                 return ret;
 336
 337         return component_master_add_with_match(&pdev->dev, &armada_master_ops,
 338                                                match);
 339 }
 340
 341 static int armada_drm_remove(struct platform_device *pdev)
 342 {
 343         component_master_del(&pdev->dev, &armada_master_ops);
 344         return 0;
 345 }
 346
 347 static const struct platform_device_id armada_drm_platform_ids[] = {
 348         {
 349                 .name           = "armada-drm",
 350         }, {
 351                 .name           = "armada-510-drm",
 352         },
 353         { },
 354 };
 355 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 356
 357 static struct platform_driver armada_drm_platform_driver = {
 358         .probe  = armada_drm_probe,
 359         .remove = armada_drm_remove,
 360         .driver = {
 361                 .name   = "armada-drm",
 362         },
 363         .id_table = armada_drm_platform_ids,
 364 };
 365
 366 static int __init armada_drm_init(void)
 367 {
 368         int ret;
 369
 370         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 371
 372         ret = platform_driver_register(&armada_lcd_platform_driver);
 373         if (ret)
 374                 return ret;
 375         ret = platform_driver_register(&armada_drm_platform_driver);
 376         if (ret)
 377                 platform_driver_unregister(&armada_lcd_platform_driver);
 378         return ret;
 379 }
 380 module_init(armada_drm_init);
 381
 382 static void __exit armada_drm_exit(void)
 383 {
 384         platform_driver_unregister(&armada_drm_platform_driver);
 385         platform_driver_unregister(&armada_lcd_platform_driver);
 386 }
 387 module_exit(armada_drm_exit);
 388
 389 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 390 MODULE_DESCRIPTION("Armada DRM Driver");
 391 MODULE_LICENSE("GPL");
 392 MODULE_ALIAS("platform:armada-drm");