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