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