kernel/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 int armada_drm_load(struct drm_device *dev, unsigned long flags)
  53 {
  54         struct armada_private *priv;
  55         struct resource *mem = NULL;
  56         int ret, n;
  57
  58         for (n = 0; ; n++) {
  59                 struct resource *r = platform_get_resource(dev->platformdev,
  60                                                            IORESOURCE_MEM, n);
  61                 if (!r)
  62                         break;
  63
  64                 /* Resources above 64K are graphics memory */
  65                 if (resource_size(r) > SZ_64K)
  66                         mem = r;
  67                 else
  68                         return -EINVAL;
  69         }
  70
  71         if (!mem)
  72                 return -ENXIO;
  73
  74         if (!devm_request_mem_region(dev->dev, mem->start,
  75                         resource_size(mem), "armada-drm"))
  76                 return -EBUSY;
  77
  78         priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
  79         if (!priv) {
  80                 DRM_ERROR("failed to allocate private\n");
  81                 return -ENOMEM;
  82         }
  83
  84         platform_set_drvdata(dev->platformdev, dev);
  85         dev->dev_private = priv;
  86
  87         INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
  88         INIT_KFIFO(priv->fb_unref);
  89
  90         /* Mode setting support */
  91         drm_mode_config_init(dev);
  92         dev->mode_config.min_width = 320;
  93         dev->mode_config.min_height = 200;
  94
  95         /*
  96          * With vscale enabled, the maximum width is 1920 due to the
  97          * 1920 by 3 lines RAM
  98          */
  99         dev->mode_config.max_width = 1920;
 100         dev->mode_config.max_height = 2048;
 101
 102         dev->mode_config.preferred_depth = 24;
 103         dev->mode_config.funcs = &armada_drm_mode_config_funcs;
 104         drm_mm_init(&priv->linear, mem->start, resource_size(mem));
 105
 106         ret = component_bind_all(dev->dev, dev);
 107         if (ret)
 108                 goto err_kms;
 109
 110         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 111         if (ret)
 112                 goto err_comp;
 113
 114         dev->irq_enabled = true;
 115         dev->vblank_disable_allowed = 1;
 116
 117         ret = armada_fbdev_init(dev);
 118         if (ret)
 119                 goto err_comp;
 120
 121         drm_kms_helper_poll_init(dev);
 122
 123         return 0;
 124
 125  err_comp:
 126         component_unbind_all(dev->dev, dev);
 127  err_kms:
 128         drm_mode_config_cleanup(dev);
 129         drm_mm_takedown(&priv->linear);
 130         flush_work(&priv->fb_unref_work);
 131
 132         return ret;
 133 }
 134
 135 static int armada_drm_unload(struct drm_device *dev)
 136 {
 137         struct armada_private *priv = dev->dev_private;
 138
 139         drm_kms_helper_poll_fini(dev);
 140         armada_fbdev_fini(dev);
 141
 142         component_unbind_all(dev->dev, dev);
 143
 144         drm_mode_config_cleanup(dev);
 145         drm_mm_takedown(&priv->linear);
 146         flush_work(&priv->fb_unref_work);
 147         dev->dev_private = NULL;
 148
 149         return 0;
 150 }
 151
 152 /* These are called under the vbl_lock. */
 153 static int armada_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 154 {
 155         struct armada_private *priv = dev->dev_private;
 156         armada_drm_crtc_enable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
 157         return 0;
 158 }
 159
 160 static void armada_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
 161 {
 162         struct armada_private *priv = dev->dev_private;
 163         armada_drm_crtc_disable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
 164 }
 165
 166 static struct drm_ioctl_desc armada_ioctls[] = {
 167         DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
 168         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
 169         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
 170 };
 171
 172 static void armada_drm_lastclose(struct drm_device *dev)
 173 {
 174         armada_fbdev_lastclose(dev);
 175 }
 176
 177 static const struct file_operations armada_drm_fops = {
 178         .owner                  = THIS_MODULE,
 179         .llseek                 = no_llseek,
 180         .read                   = drm_read,
 181         .poll                   = drm_poll,
 182         .unlocked_ioctl         = drm_ioctl,
 183         .mmap                   = drm_gem_mmap,
 184         .open                   = drm_open,
 185         .release                = drm_release,
 186 };
 187
 188 static struct drm_driver armada_drm_driver = {
 189         .load                   = armada_drm_load,
 190         .open                   = NULL,
 191         .preclose               = NULL,
 192         .postclose              = NULL,
 193         .lastclose              = armada_drm_lastclose,
 194         .unload                 = armada_drm_unload,
 195         .set_busid              = drm_platform_set_busid,
 196         .get_vblank_counter     = drm_vblank_no_hw_counter,
 197         .enable_vblank          = armada_drm_enable_vblank,
 198         .disable_vblank         = armada_drm_disable_vblank,
 199 #ifdef CONFIG_DEBUG_FS
 200         .debugfs_init           = armada_drm_debugfs_init,
 201         .debugfs_cleanup        = armada_drm_debugfs_cleanup,
 202 #endif
 203         .gem_free_object        = armada_gem_free_object,
 204         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 205         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 206         .gem_prime_export       = armada_gem_prime_export,
 207         .gem_prime_import       = armada_gem_prime_import,
 208         .dumb_create            = armada_gem_dumb_create,
 209         .dumb_map_offset        = armada_gem_dumb_map_offset,
 210         .dumb_destroy           = armada_gem_dumb_destroy,
 211         .gem_vm_ops             = &armada_gem_vm_ops,
 212         .major                  = 1,
 213         .minor                  = 0,
 214         .name                   = "armada-drm",
 215         .desc                   = "Armada SoC DRM",
 216         .date                   = "20120730",
 217         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 218                                   DRIVER_HAVE_IRQ | DRIVER_PRIME,
 219         .ioctls                 = armada_ioctls,
 220         .fops                   = &armada_drm_fops,
 221 };
 222
 223 static int armada_drm_bind(struct device *dev)
 224 {
 225         return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
 226 }
 227
 228 static void armada_drm_unbind(struct device *dev)
 229 {
 230         drm_put_dev(dev_get_drvdata(dev));
 231 }
 232
 233 static int compare_of(struct device *dev, void *data)
 234 {
 235         return dev->of_node == data;
 236 }
 237
 238 static int compare_dev_name(struct device *dev, void *data)
 239 {
 240         const char *name = data;
 241         return !strcmp(dev_name(dev), name);
 242 }
 243
 244 static void armada_add_endpoints(struct device *dev,
 245         struct component_match **match, struct device_node *port)
 246 {
 247         struct device_node *ep, *remote;
 248
 249         for_each_child_of_node(port, ep) {
 250                 remote = of_graph_get_remote_port_parent(ep);
 251                 if (!remote || !of_device_is_available(remote)) {
 252                         of_node_put(remote);
 253                         continue;
 254                 } else if (!of_device_is_available(remote->parent)) {
 255                         dev_warn(dev, "parent device of %s is not available\n",
 256                                  remote->full_name);
 257                         of_node_put(remote);
 258                         continue;
 259                 }
 260
 261                 component_match_add(dev, match, compare_of, remote);
 262                 of_node_put(remote);
 263         }
 264 }
 265
 266 static const struct component_master_ops armada_master_ops = {
 267         .bind = armada_drm_bind,
 268         .unbind = armada_drm_unbind,
 269 };
 270
 271 static int armada_drm_probe(struct platform_device *pdev)
 272 {
 273         struct component_match *match = NULL;
 274         struct device *dev = &pdev->dev;
 275         int ret;
 276
 277         ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
 278         if (ret != -EINVAL)
 279                 return ret;
 280
 281         if (dev->platform_data) {
 282                 char **devices = dev->platform_data;
 283                 struct device_node *port;
 284                 struct device *d;
 285                 int i;
 286
 287                 for (i = 0; devices[i]; i++)
 288                         component_match_add(dev, &match, compare_dev_name,
 289                                             devices[i]);
 290
 291                 if (i == 0) {
 292                         dev_err(dev, "missing 'ports' property\n");
 293                         return -ENODEV;
 294                 }
 295
 296                 for (i = 0; devices[i]; i++) {
 297                         d = bus_find_device_by_name(&platform_bus_type, NULL,
 298                                                     devices[i]);
 299                         if (d && d->of_node) {
 300                                 for_each_child_of_node(d->of_node, port)
 301                                         armada_add_endpoints(dev, &match, port);
 302                         }
 303                         put_device(d);
 304                 }
 305         }
 306
 307         return component_master_add_with_match(&pdev->dev, &armada_master_ops,
 308                                                match);
 309 }
 310
 311 static int armada_drm_remove(struct platform_device *pdev)
 312 {
 313         component_master_del(&pdev->dev, &armada_master_ops);
 314         return 0;
 315 }
 316
 317 static const struct platform_device_id armada_drm_platform_ids[] = {
 318         {
 319                 .name           = "armada-drm",
 320         }, {
 321                 .name           = "armada-510-drm",
 322         },
 323         { },
 324 };
 325 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 326
 327 static struct platform_driver armada_drm_platform_driver = {
 328         .probe  = armada_drm_probe,
 329         .remove = armada_drm_remove,
 330         .driver = {
 331                 .name   = "armada-drm",
 332         },
 333         .id_table = armada_drm_platform_ids,
 334 };
 335
 336 static int __init armada_drm_init(void)
 337 {
 338         int ret;
 339
 340         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 341
 342         ret = platform_driver_register(&armada_lcd_platform_driver);
 343         if (ret)
 344                 return ret;
 345         ret = platform_driver_register(&armada_drm_platform_driver);
 346         if (ret)
 347                 platform_driver_unregister(&armada_lcd_platform_driver);
 348         return ret;
 349 }
 350 module_init(armada_drm_init);
 351
 352 static void __exit armada_drm_exit(void)
 353 {
 354         platform_driver_unregister(&armada_drm_platform_driver);
 355         platform_driver_unregister(&armada_lcd_platform_driver);
 356 }
 357 module_exit(armada_drm_exit);
 358
 359 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 360 MODULE_DESCRIPTION("Armada DRM Driver");
 361 MODULE_LICENSE("GPL");
 362 MODULE_ALIAS("platform:armada-drm");