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 #include <drm/drm_of.h>
  22
  23 #include "sun4i_crtc.h"
  24 #include "sun4i_drv.h"
  25 #include "sun4i_framebuffer.h"
  26 #include "sun4i_layer.h"
  27 #include "sun4i_tcon.h"
  28
  29 static int sun4i_drv_enable_vblank(struct drm_device *drm, unsigned int pipe)
  30 {
  31         struct sun4i_drv *drv = drm->dev_private;
  32         struct sun4i_tcon *tcon = drv->tcon;
  33
  34         DRM_DEBUG_DRIVER("Enabling VBLANK on pipe %d\n", pipe);
  35
  36         sun4i_tcon_enable_vblank(tcon, true);
  37
  38         return 0;
  39 }
  40
  41 static void sun4i_drv_disable_vblank(struct drm_device *drm, unsigned int pipe)
  42 {
  43         struct sun4i_drv *drv = drm->dev_private;
  44         struct sun4i_tcon *tcon = drv->tcon;
  45
  46         DRM_DEBUG_DRIVER("Disabling VBLANK on pipe %d\n", pipe);
  47
  48         sun4i_tcon_enable_vblank(tcon, false);
  49 }
  50
  51 static const struct file_operations sun4i_drv_fops = {
  52         .owner          = THIS_MODULE,
  53         .open           = drm_open,
  54         .release        = drm_release,
  55         .unlocked_ioctl = drm_ioctl,
  56         .compat_ioctl   = drm_compat_ioctl,
  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_unlocked = 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         drm_fb_helper_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 (IS_ERR(drm))
 124                 return PTR_ERR(drm);
 125
 126         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
 127         if (!drv) {
 128                 ret = -ENOMEM;
 129                 goto free_drm;
 130         }
 131         drm->dev_private = drv;
 132
 133         drm_vblank_init(drm, 1);
 134         drm_mode_config_init(drm);
 135
 136         ret = component_bind_all(drm->dev, drm);
 137         if (ret) {
 138                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 139                 goto free_drm;
 140         }
 141
 142         /* Create our layers */
 143         drv->layers = sun4i_layers_init(drm);
 144         if (!drv->layers) {
 145                 dev_err(drm->dev, "Couldn't create the planes\n");
 146                 ret = -EINVAL;
 147                 goto free_drm;
 148         }
 149
 150         /* Create our CRTC */
 151         drv->crtc = sun4i_crtc_init(drm);
 152         if (!drv->crtc) {
 153                 dev_err(drm->dev, "Couldn't create the CRTC\n");
 154                 ret = -EINVAL;
 155                 goto free_drm;
 156         }
 157         drm->irq_enabled = true;
 158
 159         /* Remove early framebuffers (ie. simplefb) */
 160         sun4i_remove_framebuffers();
 161
 162         /* Create our framebuffer */
 163         drv->fbdev = sun4i_framebuffer_init(drm);
 164         if (IS_ERR(drv->fbdev)) {
 165                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 166                 ret = PTR_ERR(drv->fbdev);
 167                 goto free_drm;
 168         }
 169
 170         /* Enable connectors polling */
 171         drm_kms_helper_poll_init(drm);
 172
 173         ret = drm_dev_register(drm, 0);
 174         if (ret)
 175                 goto free_drm;
 176
 177         return 0;
 178
 179 free_drm:
 180         drm_dev_unref(drm);
 181         return ret;
 182 }
 183
 184 static void sun4i_drv_unbind(struct device *dev)
 185 {
 186         struct drm_device *drm = dev_get_drvdata(dev);
 187
 188         drm_dev_unregister(drm);
 189         drm_kms_helper_poll_fini(drm);
 190         sun4i_framebuffer_free(drm);
 191         drm_vblank_cleanup(drm);
 192         drm_dev_unref(drm);
 193 }
 194
 195 static const struct component_master_ops sun4i_drv_master_ops = {
 196         .bind   = sun4i_drv_bind,
 197         .unbind = sun4i_drv_unbind,
 198 };
 199
 200 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 201 {
 202         return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 203                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
 204 }
 205
 206 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 207 {
 208         return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
 209                 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon");
 210 }
 211
 212 static int compare_of(struct device *dev, void *data)
 213 {
 214         DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
 215                          of_node_full_name(dev->of_node),
 216                          of_node_full_name(data));
 217
 218         return dev->of_node == data;
 219 }
 220
 221 static int sun4i_drv_add_endpoints(struct device *dev,
 222                                    struct component_match **match,
 223                                    struct device_node *node)
 224 {
 225         struct device_node *port, *ep, *remote;
 226         int count = 0;
 227
 228         /*
 229          * We don't support the frontend for now, so we will never
 230          * have a device bound. Just skip over it, but we still want
 231          * the rest our pipeline to be added.
 232          */
 233         if (!sun4i_drv_node_is_frontend(node) &&
 234             !of_device_is_available(node))
 235                 return 0;
 236
 237         if (!sun4i_drv_node_is_frontend(node)) {
 238                 /* Add current component */
 239                 DRM_DEBUG_DRIVER("Adding component %s\n",
 240                                  of_node_full_name(node));
 241                 drm_of_component_match_add(dev, match, compare_of, node);
 242                 count++;
 243         }
 244
 245         /* Inputs are listed first, then outputs */
 246         port = of_graph_get_port_by_id(node, 1);
 247         if (!port) {
 248                 DRM_DEBUG_DRIVER("No output to bind\n");
 249                 return count;
 250         }
 251
 252         for_each_available_child_of_node(port, ep) {
 253                 remote = of_graph_get_remote_port_parent(ep);
 254                 if (!remote) {
 255                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 256                         of_node_put(remote);
 257                         continue;
 258                 }
 259
 260                 /*
 261                  * If the node is our TCON, the first port is used for
 262                  * panel or bridges, and will not be part of the
 263                  * component framework.
 264                  */
 265                 if (sun4i_drv_node_is_tcon(node)) {
 266                         struct of_endpoint endpoint;
 267
 268                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 269                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 270                                 continue;
 271                         }
 272
 273                         if (!endpoint.id) {
 274                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 275                                 continue;
 276                         }
 277                 }
 278
 279                 /* Walk down our tree */
 280                 count += sun4i_drv_add_endpoints(dev, match, remote);
 281
 282                 of_node_put(remote);
 283         }
 284
 285         return count;
 286 }
 287
 288 static int sun4i_drv_probe(struct platform_device *pdev)
 289 {
 290         struct component_match *match = NULL;
 291         struct device_node *np = pdev->dev.of_node;
 292         int i, count = 0;
 293
 294         for (i = 0;; i++) {
 295                 struct device_node *pipeline = of_parse_phandle(np,
 296                                                                 "allwinner,pipelines",
 297                                                                 i);
 298                 if (!pipeline)
 299                         break;
 300
 301                 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 302                                                 pipeline);
 303                 of_node_put(pipeline);
 304
 305                 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 306                                  count, i);
 307         }
 308
 309         if (count)
 310                 return component_master_add_with_match(&pdev->dev,
 311                                                        &sun4i_drv_master_ops,
 312                                                        match);
 313         else
 314                 return 0;
 315 }
 316
 317 static int sun4i_drv_remove(struct platform_device *pdev)
 318 {
 319         return 0;
 320 }
 321
 322 static const struct of_device_id sun4i_drv_of_table[] = {
 323         { .compatible = "allwinner,sun5i-a13-display-engine" },
 324         { .compatible = "allwinner,sun8i-a33-display-engine" },
 325         { }
 326 };
 327 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 328
 329 static struct platform_driver sun4i_drv_platform_driver = {
 330         .probe          = sun4i_drv_probe,
 331         .remove         = sun4i_drv_remove,
 332         .driver         = {
 333                 .name           = "sun4i-drm",
 334                 .of_match_table = sun4i_drv_of_table,
 335         },
 336 };
 337 module_platform_driver(sun4i_drv_platform_driver);
 338
 339 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 340 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 341 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 342 MODULE_LICENSE("GPL");