drivers/gpu/drm/sun4i/sun4i_drv.c

   1 /*
   2  * Copyright (C) 2015 Free Electrons
   3  * Copyright (C) 2015 NextThing Co
   4  *
   5  * Maxime Ripard <maxime.ripard@free-electrons.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/component.h>
  14 #include <linux/of_graph.h>
  15
  16 #include <drm/drmP.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_fb_cma_helper.h>
  19 #include <drm/drm_gem_cma_helper.h>
  20
  21 #include "sun4i_crtc.h"
  22 #include "sun4i_drv.h"
  23 #include "sun4i_framebuffer.h"
  24 #include "sun4i_layer.h"
  25 #include "sun4i_tcon.h"
  26
  27 static int sun4i_drv_enable_vblank(struct drm_device *drm, unsigned int pipe)
  28 {
  29         struct sun4i_drv *drv = drm->dev_private;
  30         struct sun4i_tcon *tcon = drv->tcon;
  31
  32         DRM_DEBUG_DRIVER("Enabling VBLANK on pipe %d\n", pipe);
  33
  34         sun4i_tcon_enable_vblank(tcon, true);
  35
  36         return 0;
  37 }
  38
  39 static void sun4i_drv_disable_vblank(struct drm_device *drm, unsigned int pipe)
  40 {
  41         struct sun4i_drv *drv = drm->dev_private;
  42         struct sun4i_tcon *tcon = drv->tcon;
  43
  44         DRM_DEBUG_DRIVER("Disabling VBLANK on pipe %d\n", pipe);
  45
  46         sun4i_tcon_enable_vblank(tcon, false);
  47 }
  48
  49 static const struct file_operations sun4i_drv_fops = {
  50         .owner          = THIS_MODULE,
  51         .open           = drm_open,
  52         .release        = drm_release,
  53         .unlocked_ioctl = drm_ioctl,
  54 #ifdef CONFIG_COMPAT
  55         .compat_ioctl   = drm_compat_ioctl,
  56 #endif
  57         .poll           = drm_poll,
  58         .read           = drm_read,
  59         .llseek         = no_llseek,
  60         .mmap           = drm_gem_cma_mmap,
  61 };
  62
  63 static struct drm_driver sun4i_drv_driver = {
  64         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  65
  66         /* Generic Operations */
  67         .fops                   = &sun4i_drv_fops,
  68         .name                   = "sun4i-drm",
  69         .desc                   = "Allwinner sun4i Display Engine",
  70         .date                   = "20150629",
  71         .major                  = 1,
  72         .minor                  = 0,
  73
  74         /* GEM Operations */
  75         .dumb_create            = drm_gem_cma_dumb_create,
  76         .dumb_destroy           = drm_gem_dumb_destroy,
  77         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
  78         .gem_free_object        = drm_gem_cma_free_object,
  79         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  80
  81         /* PRIME Operations */
  82         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  83         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  84         .gem_prime_import       = drm_gem_prime_import,
  85         .gem_prime_export       = drm_gem_prime_export,
  86         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  87         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  88         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  89         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  90         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  91
  92         /* Frame Buffer Operations */
  93
  94         /* VBlank Operations */
  95         .get_vblank_counter     = drm_vblank_no_hw_counter,
  96         .enable_vblank          = sun4i_drv_enable_vblank,
  97         .disable_vblank         = sun4i_drv_disable_vblank,
  98 };
  99
 100 static void sun4i_remove_framebuffers(void)
 101 {
 102         struct apertures_struct *ap;
 103
 104         ap = alloc_apertures(1);
 105         if (!ap)
 106                 return;
 107
 108         /* The framebuffer can be located anywhere in RAM */
 109         ap->ranges[0].base = 0;
 110         ap->ranges[0].size = ~0;
 111
 112         remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
 113         kfree(ap);
 114 }
 115
 116 static int sun4i_drv_bind(struct device *dev)
 117 {
 118         struct drm_device *drm;
 119         struct sun4i_drv *drv;
 120         int ret;
 121
 122         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
 123         if (!drm)
 124                 return -ENOMEM;
 125
 126         ret = drm_dev_set_unique(drm, dev_name(drm->dev));
 127         if (ret)
 128                 goto free_drm;
 129
 130         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
 131         if (!drv) {
 132                 ret = -ENOMEM;
 133                 goto free_drm;
 134         }
 135         drm->dev_private = drv;
 136
 137         drm_vblank_init(drm, 1);
 138         drm_mode_config_init(drm);
 139
 140         ret = component_bind_all(drm->dev, drm);
 141         if (ret) {
 142                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 143                 goto free_drm;
 144         }
 145
 146         /* Create our layers */
 147         drv->layers = sun4i_layers_init(drm);
 148         if (!drv->layers) {
 149                 dev_err(drm->dev, "Couldn't create the planes\n");
 150                 ret = -EINVAL;
 151                 goto free_drm;
 152         }
 153
 154         /* Create our CRTC */
 155         drv->crtc = sun4i_crtc_init(drm);
 156         if (!drv->crtc) {
 157                 dev_err(drm->dev, "Couldn't create the CRTC\n");
 158                 ret = -EINVAL;
 159                 goto free_drm;
 160         }
 161         drm->irq_enabled = true;
 162
 163         /* Remove early framebuffers (ie. simplefb) */
 164         sun4i_remove_framebuffers();
 165
 166         /* Create our framebuffer */
 167         drv->fbdev = sun4i_framebuffer_init(drm);
 168         if (IS_ERR(drv->fbdev)) {
 169                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 170                 ret = PTR_ERR(drv->fbdev);
 171                 goto free_drm;
 172         }
 173
 174         /* Enable connectors polling */
 175         drm_kms_helper_poll_init(drm);
 176
 177         ret = drm_dev_register(drm, 0);
 178         if (ret)
 179                 goto free_drm;
 180
 181         ret = drm_connector_register_all(drm);
 182         if (ret)
 183                 goto unregister_drm;
 184
 185         return 0;
 186
 187 unregister_drm:
 188         drm_dev_unregister(drm);
 189 free_drm:
 190         drm_dev_unref(drm);
 191         return ret;
 192 }
 193
 194 static void sun4i_drv_unbind(struct device *dev)
 195 {
 196         struct drm_device *drm = dev_get_drvdata(dev);
 197
 198         drm_connector_unregister_all(drm);
 199         drm_dev_unregister(drm);
 200         drm_kms_helper_poll_fini(drm);
 201         sun4i_framebuffer_free(drm);
 202         drm_vblank_cleanup(drm);
 203         drm_dev_unref(drm);
 204 }
 205
 206 static const struct component_master_ops sun4i_drv_master_ops = {
 207         .bind   = sun4i_drv_bind,
 208         .unbind = sun4i_drv_unbind,
 209 };
 210
 211 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 212 {
 213         return of_device_is_compatible(node,
 214                                        "allwinner,sun5i-a13-display-frontend");
 215 }
 216
 217 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 218 {
 219         return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon");
 220 }
 221
 222 static int compare_of(struct device *dev, void *data)
 223 {
 224         DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
 225                          of_node_full_name(dev->of_node),
 226                          of_node_full_name(data));
 227
 228         return dev->of_node == data;
 229 }
 230
 231 static int sun4i_drv_add_endpoints(struct device *dev,
 232                                    struct component_match **match,
 233                                    struct device_node *node)
 234 {
 235         struct device_node *port, *ep, *remote;
 236         int count = 0;
 237
 238         /*
 239          * We don't support the frontend for now, so we will never
 240          * have a device bound. Just skip over it, but we still want
 241          * the rest our pipeline to be added.
 242          */
 243         if (!sun4i_drv_node_is_frontend(node) &&
 244             !of_device_is_available(node))
 245                 return 0;
 246
 247         if (!sun4i_drv_node_is_frontend(node)) {
 248                 /* Add current component */
 249                 DRM_DEBUG_DRIVER("Adding component %s\n",
 250                                  of_node_full_name(node));
 251                 component_match_add(dev, match, compare_of, node);
 252                 count++;
 253         }
 254
 255         /* Inputs are listed first, then outputs */
 256         port = of_graph_get_port_by_id(node, 1);
 257         if (!port) {
 258                 DRM_DEBUG_DRIVER("No output to bind\n");
 259                 return count;
 260         }
 261
 262         for_each_available_child_of_node(port, ep) {
 263                 remote = of_graph_get_remote_port_parent(ep);
 264                 if (!remote) {
 265                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 266                         of_node_put(remote);
 267                         continue;
 268                 }
 269
 270                 /*
 271                  * If the node is our TCON, the first port is used for our
 272                  * panel, and will not be part of the
 273                  * component framework.
 274                  */
 275                 if (sun4i_drv_node_is_tcon(node)) {
 276                         struct of_endpoint endpoint;
 277
 278                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 279                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 280                                 continue;
 281                         }
 282
 283                         if (!endpoint.id) {
 284                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 285                                 continue;
 286                         }
 287                 }
 288
 289                 /* Walk down our tree */
 290                 count += sun4i_drv_add_endpoints(dev, match, remote);
 291
 292                 of_node_put(remote);
 293         }
 294
 295         return count;
 296 }
 297
 298 static int sun4i_drv_probe(struct platform_device *pdev)
 299 {
 300         struct component_match *match = NULL;
 301         struct device_node *np = pdev->dev.of_node;
 302         int i, count = 0;
 303
 304         for (i = 0;; i++) {
 305                 struct device_node *pipeline = of_parse_phandle(np,
 306                                                                 "allwinner,pipelines",
 307                                                                 i);
 308                 if (!pipeline)
 309                         break;
 310
 311                 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 312                                                 pipeline);
 313                 of_node_put(pipeline);
 314
 315                 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 316                                  count, i);
 317         }
 318
 319         if (count)
 320                 return component_master_add_with_match(&pdev->dev,
 321                                                        &sun4i_drv_master_ops,
 322                                                        match);
 323         else
 324                 return 0;
 325 }
 326
 327 static int sun4i_drv_remove(struct platform_device *pdev)
 328 {
 329         return 0;
 330 }
 331
 332 static const struct of_device_id sun4i_drv_of_table[] = {
 333         { .compatible = "allwinner,sun5i-a13-display-engine" },
 334         { }
 335 };
 336 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 337
 338 static struct platform_driver sun4i_drv_platform_driver = {
 339         .probe          = sun4i_drv_probe,
 340         .remove         = sun4i_drv_remove,
 341         .driver         = {
 342                 .name           = "sun4i-drm",
 343                 .of_match_table = sun4i_drv_of_table,
 344         },
 345 };
 346 module_platform_driver(sun4i_drv_platform_driver);
 347
 348 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 349 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 350 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 351 MODULE_LICENSE("GPL");