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 #include <linux/of_reserved_mem.h>
  16
  17 #include <drm/drmP.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_of.h>
  23
  24 #include "sun4i_drv.h"
  25 #include "sun4i_framebuffer.h"
  26 #include "sun4i_tcon.h"
  27
  28 static void sun4i_drv_lastclose(struct drm_device *dev)
  29 {
  30         struct sun4i_drv *drv = dev->dev_private;
  31
  32         drm_fbdev_cma_restore_mode(drv->fbdev);
  33 }
  34
  35 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
  36
  37 static struct drm_driver sun4i_drv_driver = {
  38         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  39
  40         /* Generic Operations */
  41         .lastclose              = sun4i_drv_lastclose,
  42         .fops                   = &sun4i_drv_fops,
  43         .name                   = "sun4i-drm",
  44         .desc                   = "Allwinner sun4i Display Engine",
  45         .date                   = "20150629",
  46         .major                  = 1,
  47         .minor                  = 0,
  48
  49         /* GEM Operations */
  50         .dumb_create            = drm_gem_cma_dumb_create,
  51         .gem_free_object_unlocked = drm_gem_cma_free_object,
  52         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  53
  54         /* PRIME Operations */
  55         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  56         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  57         .gem_prime_import       = drm_gem_prime_import,
  58         .gem_prime_export       = drm_gem_prime_export,
  59         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  60         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  61         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  62         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  63         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  64
  65         /* Frame Buffer Operations */
  66 };
  67
  68 static void sun4i_remove_framebuffers(void)
  69 {
  70         struct apertures_struct *ap;
  71
  72         ap = alloc_apertures(1);
  73         if (!ap)
  74                 return;
  75
  76         /* The framebuffer can be located anywhere in RAM */
  77         ap->ranges[0].base = 0;
  78         ap->ranges[0].size = ~0;
  79
  80         drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
  81         kfree(ap);
  82 }
  83
  84 static int sun4i_drv_bind(struct device *dev)
  85 {
  86         struct drm_device *drm;
  87         struct sun4i_drv *drv;
  88         int ret;
  89
  90         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  91         if (IS_ERR(drm))
  92                 return PTR_ERR(drm);
  93
  94         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  95         if (!drv) {
  96                 ret = -ENOMEM;
  97                 goto free_drm;
  98         }
  99
 100         dev_set_drvdata(dev, drm);
 101         drm->dev_private = drv;
 102         INIT_LIST_HEAD(&drv->engine_list);
 103         INIT_LIST_HEAD(&drv->tcon_list);
 104
 105         ret = of_reserved_mem_device_init(dev);
 106         if (ret && ret != -ENODEV) {
 107                 dev_err(drm->dev, "Couldn't claim our memory region\n");
 108                 goto free_drm;
 109         }
 110
 111         /* drm_vblank_init calls kcalloc, which can fail */
 112         ret = drm_vblank_init(drm, 1);
 113         if (ret)
 114                 goto free_mem_region;
 115
 116         drm_mode_config_init(drm);
 117
 118         ret = component_bind_all(drm->dev, drm);
 119         if (ret) {
 120                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 121                 goto cleanup_mode_config;
 122         }
 123
 124         drm->irq_enabled = true;
 125
 126         /* Remove early framebuffers (ie. simplefb) */
 127         sun4i_remove_framebuffers();
 128
 129         /* Create our framebuffer */
 130         drv->fbdev = sun4i_framebuffer_init(drm);
 131         if (IS_ERR(drv->fbdev)) {
 132                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 133                 ret = PTR_ERR(drv->fbdev);
 134                 goto cleanup_mode_config;
 135         }
 136
 137         /* Enable connectors polling */
 138         drm_kms_helper_poll_init(drm);
 139
 140         ret = drm_dev_register(drm, 0);
 141         if (ret)
 142                 goto finish_poll;
 143
 144         return 0;
 145
 146 finish_poll:
 147         drm_kms_helper_poll_fini(drm);
 148         sun4i_framebuffer_free(drm);
 149 cleanup_mode_config:
 150         drm_mode_config_cleanup(drm);
 151 free_mem_region:
 152         of_reserved_mem_device_release(dev);
 153 free_drm:
 154         drm_dev_unref(drm);
 155         return ret;
 156 }
 157
 158 static void sun4i_drv_unbind(struct device *dev)
 159 {
 160         struct drm_device *drm = dev_get_drvdata(dev);
 161
 162         drm_dev_unregister(drm);
 163         drm_kms_helper_poll_fini(drm);
 164         sun4i_framebuffer_free(drm);
 165         drm_mode_config_cleanup(drm);
 166         of_reserved_mem_device_release(dev);
 167         drm_dev_unref(drm);
 168 }
 169
 170 static const struct component_master_ops sun4i_drv_master_ops = {
 171         .bind   = sun4i_drv_bind,
 172         .unbind = sun4i_drv_unbind,
 173 };
 174
 175 static bool sun4i_drv_node_is_connector(struct device_node *node)
 176 {
 177         return of_device_is_compatible(node, "hdmi-connector");
 178 }
 179
 180 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 181 {
 182         return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 183                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 184                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
 185 }
 186
 187 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 188 {
 189         return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
 190                 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
 191                 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
 192                 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon") ||
 193                 of_device_is_compatible(node, "allwinner,sun8i-v3s-tcon");
 194 }
 195
 196 static int compare_of(struct device *dev, void *data)
 197 {
 198         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 199                          dev->of_node,
 200                          data);
 201
 202         return dev->of_node == data;
 203 }
 204
 205 static int sun4i_drv_add_endpoints(struct device *dev,
 206                                    struct component_match **match,
 207                                    struct device_node *node)
 208 {
 209         struct device_node *port, *ep, *remote;
 210         int count = 0;
 211
 212         /*
 213          * We don't support the frontend for now, so we will never
 214          * have a device bound. Just skip over it, but we still want
 215          * the rest our pipeline to be added.
 216          */
 217         if (!sun4i_drv_node_is_frontend(node) &&
 218             !of_device_is_available(node))
 219                 return 0;
 220
 221         /*
 222          * The connectors will be the last nodes in our pipeline, we
 223          * can just bail out.
 224          */
 225         if (sun4i_drv_node_is_connector(node))
 226                 return 0;
 227
 228         if (!sun4i_drv_node_is_frontend(node)) {
 229                 /* Add current component */
 230                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 231                 drm_of_component_match_add(dev, match, compare_of, node);
 232                 count++;
 233         }
 234
 235         /* Inputs are listed first, then outputs */
 236         port = of_graph_get_port_by_id(node, 1);
 237         if (!port) {
 238                 DRM_DEBUG_DRIVER("No output to bind\n");
 239                 return count;
 240         }
 241
 242         for_each_available_child_of_node(port, ep) {
 243                 remote = of_graph_get_remote_port_parent(ep);
 244                 if (!remote) {
 245                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 246                         continue;
 247                 }
 248
 249                 /*
 250                  * If the node is our TCON, the first port is used for
 251                  * panel or bridges, and will not be part of the
 252                  * component framework.
 253                  */
 254                 if (sun4i_drv_node_is_tcon(node)) {
 255                         struct of_endpoint endpoint;
 256
 257                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 258                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 259                                 of_node_put(remote);
 260                                 continue;
 261                         }
 262
 263                         if (!endpoint.id) {
 264                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 265                                 of_node_put(remote);
 266                                 continue;
 267                         }
 268                 }
 269
 270                 /* Walk down our tree */
 271                 count += sun4i_drv_add_endpoints(dev, match, remote);
 272
 273                 of_node_put(remote);
 274         }
 275
 276         return count;
 277 }
 278
 279 static int sun4i_drv_probe(struct platform_device *pdev)
 280 {
 281         struct component_match *match = NULL;
 282         struct device_node *np = pdev->dev.of_node;
 283         int i, count = 0;
 284
 285         for (i = 0;; i++) {
 286                 struct device_node *pipeline = of_parse_phandle(np,
 287                                                                 "allwinner,pipelines",
 288                                                                 i);
 289                 if (!pipeline)
 290                         break;
 291
 292                 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 293                                                 pipeline);
 294                 of_node_put(pipeline);
 295
 296                 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 297                                  count, i);
 298         }
 299
 300         if (count)
 301                 return component_master_add_with_match(&pdev->dev,
 302                                                        &sun4i_drv_master_ops,
 303                                                        match);
 304         else
 305                 return 0;
 306 }
 307
 308 static int sun4i_drv_remove(struct platform_device *pdev)
 309 {
 310         return 0;
 311 }
 312
 313 static const struct of_device_id sun4i_drv_of_table[] = {
 314         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 315         { .compatible = "allwinner,sun5i-a13-display-engine" },
 316         { .compatible = "allwinner,sun6i-a31-display-engine" },
 317         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 318         { .compatible = "allwinner,sun8i-a33-display-engine" },
 319         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 320         { }
 321 };
 322 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 323
 324 static struct platform_driver sun4i_drv_platform_driver = {
 325         .probe          = sun4i_drv_probe,
 326         .remove         = sun4i_drv_remove,
 327         .driver         = {
 328                 .name           = "sun4i-drm",
 329                 .of_match_table = sun4i_drv_of_table,
 330         },
 331 };
 332 module_platform_driver(sun4i_drv_platform_driver);
 333
 334 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 335 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 336 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 337 MODULE_LICENSE("GPL");