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 #include <drm/drm_fb_helper.h>
  21
  22 #include "sun4i_crtc.h"
  23 #include "sun4i_drv.h"
  24 #include "sun4i_framebuffer.h"
  25 #include "sun4i_layer.h"
  26 #include "sun4i_tcon.h"
  27
  28 static int sun4i_drv_enable_vblank(struct drm_device *drm, unsigned int pipe)
  29 {
  30         struct sun4i_drv *drv = drm->dev_private;
  31         struct sun4i_tcon *tcon = drv->tcon;
  32
  33         DRM_DEBUG_DRIVER("Enabling VBLANK on pipe %d\n", pipe);
  34
  35         sun4i_tcon_enable_vblank(tcon, true);
  36
  37         return 0;
  38 }
  39
  40 static void sun4i_drv_disable_vblank(struct drm_device *drm, unsigned int pipe)
  41 {
  42         struct sun4i_drv *drv = drm->dev_private;
  43         struct sun4i_tcon *tcon = drv->tcon;
  44
  45         DRM_DEBUG_DRIVER("Disabling VBLANK on pipe %d\n", pipe);
  46
  47         sun4i_tcon_enable_vblank(tcon, false);
  48 }
  49
  50 static void sun4i_drv_lastclose(struct drm_device *dev)
  51 {
  52         struct sun4i_drv *drv = dev->dev_private;
  53
  54         drm_fbdev_cma_restore_mode(drv->fbdev);
  55 }
  56
  57 static const struct file_operations sun4i_drv_fops = {
  58         .owner          = THIS_MODULE,
  59         .open           = drm_open,
  60         .release        = drm_release,
  61         .unlocked_ioctl = drm_ioctl,
  62 #ifdef CONFIG_COMPAT
  63         .compat_ioctl   = drm_compat_ioctl,
  64 #endif
  65         .poll           = drm_poll,
  66         .read           = drm_read,
  67         .llseek         = no_llseek,
  68         .mmap           = drm_gem_cma_mmap,
  69 };
  70
  71 static struct drm_driver sun4i_drv_driver = {
  72         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  73
  74         /* Generic Operations */
  75         .lastclose              = sun4i_drv_lastclose,
  76         .fops                   = &sun4i_drv_fops,
  77         .name                   = "sun4i-drm",
  78         .desc                   = "Allwinner sun4i Display Engine",
  79         .date                   = "20150629",
  80         .major                  = 1,
  81         .minor                  = 0,
  82
  83         /* GEM Operations */
  84         .dumb_create            = drm_gem_cma_dumb_create,
  85         .dumb_destroy           = drm_gem_dumb_destroy,
  86         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
  87         .gem_free_object_unlocked = drm_gem_cma_free_object,
  88         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  89
  90         /* PRIME Operations */
  91         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  92         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  93         .gem_prime_import       = drm_gem_prime_import,
  94         .gem_prime_export       = drm_gem_prime_export,
  95         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  96         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  97         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  98         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  99         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 100
 101         /* Frame Buffer Operations */
 102
 103         /* VBlank Operations */
 104         .get_vblank_counter     = drm_vblank_no_hw_counter,
 105         .enable_vblank          = sun4i_drv_enable_vblank,
 106         .disable_vblank         = sun4i_drv_disable_vblank,
 107 };
 108
 109 static void sun4i_remove_framebuffers(void)
 110 {
 111         struct apertures_struct *ap;
 112
 113         ap = alloc_apertures(1);
 114         if (!ap)
 115                 return;
 116
 117         /* The framebuffer can be located anywhere in RAM */
 118         ap->ranges[0].base = 0;
 119         ap->ranges[0].size = ~0;
 120
 121         drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
 122         kfree(ap);
 123 }
 124
 125 static int sun4i_drv_bind(struct device *dev)
 126 {
 127         struct drm_device *drm;
 128         struct sun4i_drv *drv;
 129         int ret;
 130
 131         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
 132         if (IS_ERR(drm))
 133                 return PTR_ERR(drm);
 134
 135         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
 136         if (!drv) {
 137                 ret = -ENOMEM;
 138                 goto free_drm;
 139         }
 140
 141         dev_set_drvdata(dev, drm);
 142         drm->dev_private = drv;
 143
 144         drm_vblank_init(drm, 1);
 145         drm_mode_config_init(drm);
 146
 147         ret = component_bind_all(drm->dev, drm);
 148         if (ret) {
 149                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 150                 goto cleanup_mode_config;
 151         }
 152
 153         /* Create our layers */
 154         drv->layers = sun4i_layers_init(drm);
 155         if (IS_ERR(drv->layers)) {
 156                 dev_err(drm->dev, "Couldn't create the planes\n");
 157                 ret = PTR_ERR(drv->layers);
 158                 goto cleanup_mode_config;
 159         }
 160
 161         /* Create our CRTC */
 162         drv->crtc = sun4i_crtc_init(drm);
 163         if (!drv->crtc) {
 164                 dev_err(drm->dev, "Couldn't create the CRTC\n");
 165                 ret = -EINVAL;
 166                 goto cleanup_mode_config;
 167         }
 168         drm->irq_enabled = true;
 169
 170         /* Remove early framebuffers (ie. simplefb) */
 171         sun4i_remove_framebuffers();
 172
 173         /* Create our framebuffer */
 174         drv->fbdev = sun4i_framebuffer_init(drm);
 175         if (IS_ERR(drv->fbdev)) {
 176                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 177                 ret = PTR_ERR(drv->fbdev);
 178                 goto cleanup_mode_config;
 179         }
 180
 181         /* Enable connectors polling */
 182         drm_kms_helper_poll_init(drm);
 183
 184         ret = drm_dev_register(drm, 0);
 185         if (ret)
 186                 goto finish_poll;
 187
 188         return 0;
 189
 190 finish_poll:
 191         drm_kms_helper_poll_fini(drm);
 192         sun4i_framebuffer_free(drm);
 193 cleanup_mode_config:
 194         drm_mode_config_cleanup(drm);
 195         drm_vblank_cleanup(drm);
 196 free_drm:
 197         drm_dev_unref(drm);
 198         return ret;
 199 }
 200
 201 static void sun4i_drv_unbind(struct device *dev)
 202 {
 203         struct drm_device *drm = dev_get_drvdata(dev);
 204
 205         drm_dev_unregister(drm);
 206         drm_kms_helper_poll_fini(drm);
 207         sun4i_framebuffer_free(drm);
 208         drm_vblank_cleanup(drm);
 209         drm_dev_unref(drm);
 210 }
 211
 212 static const struct component_master_ops sun4i_drv_master_ops = {
 213         .bind   = sun4i_drv_bind,
 214         .unbind = sun4i_drv_unbind,
 215 };
 216
 217 static bool sun4i_drv_node_is_connector(struct device_node *node)
 218 {
 219         return of_device_is_compatible(node, "hdmi-connector");
 220 }
 221
 222 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 223 {
 224         return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 225                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 226                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
 227 }
 228
 229 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 230 {
 231         return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
 232                 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
 233                 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
 234                 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon");
 235 }
 236
 237 static int compare_of(struct device *dev, void *data)
 238 {
 239         DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
 240                          of_node_full_name(dev->of_node),
 241                          of_node_full_name(data));
 242
 243         return dev->of_node == data;
 244 }
 245
 246 static int sun4i_drv_add_endpoints(struct device *dev,
 247                                    struct component_match **match,
 248                                    struct device_node *node)
 249 {
 250         struct device_node *port, *ep, *remote;
 251         int count = 0;
 252
 253         /*
 254          * We don't support the frontend for now, so we will never
 255          * have a device bound. Just skip over it, but we still want
 256          * the rest our pipeline to be added.
 257          */
 258         if (!sun4i_drv_node_is_frontend(node) &&
 259             !of_device_is_available(node))
 260                 return 0;
 261
 262         /*
 263          * The connectors will be the last nodes in our pipeline, we
 264          * can just bail out.
 265          */
 266         if (sun4i_drv_node_is_connector(node))
 267                 return 0;
 268
 269         if (!sun4i_drv_node_is_frontend(node)) {
 270                 /* Add current component */
 271                 DRM_DEBUG_DRIVER("Adding component %s\n",
 272                                  of_node_full_name(node));
 273                 component_match_add(dev, match, compare_of, node);
 274                 count++;
 275         }
 276
 277         /* Inputs are listed first, then outputs */
 278         port = of_graph_get_port_by_id(node, 1);
 279         if (!port) {
 280                 DRM_DEBUG_DRIVER("No output to bind\n");
 281                 return count;
 282         }
 283
 284         for_each_available_child_of_node(port, ep) {
 285                 remote = of_graph_get_remote_port_parent(ep);
 286                 if (!remote) {
 287                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 288                         continue;
 289                 }
 290
 291                 /*
 292                  * If the node is our TCON, the first port is used for
 293                  * panel or bridges, and will not be part of the
 294                  * component framework.
 295                  */
 296                 if (sun4i_drv_node_is_tcon(node)) {
 297                         struct of_endpoint endpoint;
 298
 299                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 300                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 301                                 of_node_put(remote);
 302                                 continue;
 303                         }
 304
 305                         if (!endpoint.id) {
 306                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 307                                 of_node_put(remote);
 308                                 continue;
 309                         }
 310                 }
 311
 312                 /* Walk down our tree */
 313                 count += sun4i_drv_add_endpoints(dev, match, remote);
 314
 315                 of_node_put(remote);
 316         }
 317
 318         return count;
 319 }
 320
 321 static int sun4i_drv_probe(struct platform_device *pdev)
 322 {
 323         struct component_match *match = NULL;
 324         struct device_node *np = pdev->dev.of_node;
 325         int i, count = 0;
 326
 327         for (i = 0;; i++) {
 328                 struct device_node *pipeline = of_parse_phandle(np,
 329                                                                 "allwinner,pipelines",
 330                                                                 i);
 331                 if (!pipeline)
 332                         break;
 333
 334                 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 335                                                 pipeline);
 336                 of_node_put(pipeline);
 337
 338                 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 339                                  count, i);
 340         }
 341
 342         if (count)
 343                 return component_master_add_with_match(&pdev->dev,
 344                                                        &sun4i_drv_master_ops,
 345                                                        match);
 346         else
 347                 return 0;
 348 }
 349
 350 static int sun4i_drv_remove(struct platform_device *pdev)
 351 {
 352         return 0;
 353 }
 354
 355 static const struct of_device_id sun4i_drv_of_table[] = {
 356         { .compatible = "allwinner,sun5i-a13-display-engine" },
 357         { .compatible = "allwinner,sun6i-a31-display-engine" },
 358         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 359         { .compatible = "allwinner,sun8i-a33-display-engine" },
 360         { }
 361 };
 362 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 363
 364 static struct platform_driver sun4i_drv_platform_driver = {
 365         .probe          = sun4i_drv_probe,
 366         .remove         = sun4i_drv_remove,
 367         .driver         = {
 368                 .name           = "sun4i-drm",
 369                 .of_match_table = sun4i_drv_of_table,
 370         },
 371 };
 372 module_platform_driver(sun4i_drv_platform_driver);
 373
 374 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 375 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 376 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 377 MODULE_LICENSE("GPL");