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