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
  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         drm_vblank_init(drm, 1);
  96         drm_mode_config_init(drm);
  97
  98         ret = component_bind_all(drm->dev, drm);
  99         if (ret) {
 100                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 101                 goto free_drm;
 102         }
 103
 104         /* Create our layers */
 105         drv->layers = sun4i_layers_init(drm);
 106         if (IS_ERR(drv->layers)) {
 107                 dev_err(drm->dev, "Couldn't create the planes\n");
 108                 ret = PTR_ERR(drv->layers);
 109                 goto free_drm;
 110         }
 111
 112         /* Create our CRTC */
 113         drv->crtc = sun4i_crtc_init(drm);
 114         if (!drv->crtc) {
 115                 dev_err(drm->dev, "Couldn't create the CRTC\n");
 116                 ret = -EINVAL;
 117                 goto free_drm;
 118         }
 119         drm->irq_enabled = true;
 120
 121         /* Remove early framebuffers (ie. simplefb) */
 122         sun4i_remove_framebuffers();
 123
 124         /* Create our framebuffer */
 125         drv->fbdev = sun4i_framebuffer_init(drm);
 126         if (IS_ERR(drv->fbdev)) {
 127                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 128                 ret = PTR_ERR(drv->fbdev);
 129                 goto free_drm;
 130         }
 131
 132         /* Enable connectors polling */
 133         drm_kms_helper_poll_init(drm);
 134
 135         ret = drm_dev_register(drm, 0);
 136         if (ret)
 137                 goto free_drm;
 138
 139         return 0;
 140
 141 free_drm:
 142         drm_dev_unref(drm);
 143         return ret;
 144 }
 145
 146 static void sun4i_drv_unbind(struct device *dev)
 147 {
 148         struct drm_device *drm = dev_get_drvdata(dev);
 149
 150         drm_dev_unregister(drm);
 151         drm_kms_helper_poll_fini(drm);
 152         sun4i_framebuffer_free(drm);
 153         drm_vblank_cleanup(drm);
 154         drm_dev_unref(drm);
 155 }
 156
 157 static const struct component_master_ops sun4i_drv_master_ops = {
 158         .bind   = sun4i_drv_bind,
 159         .unbind = sun4i_drv_unbind,
 160 };
 161
 162 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 163 {
 164         return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 165                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 166                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
 167 }
 168
 169 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 170 {
 171         return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
 172                 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
 173                 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
 174                 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon");
 175 }
 176
 177 static int compare_of(struct device *dev, void *data)
 178 {
 179         DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
 180                          of_node_full_name(dev->of_node),
 181                          of_node_full_name(data));
 182
 183         return dev->of_node == data;
 184 }
 185
 186 static int sun4i_drv_add_endpoints(struct device *dev,
 187                                    struct component_match **match,
 188                                    struct device_node *node)
 189 {
 190         struct device_node *port, *ep, *remote;
 191         int count = 0;
 192
 193         /*
 194          * We don't support the frontend for now, so we will never
 195          * have a device bound. Just skip over it, but we still want
 196          * the rest our pipeline to be added.
 197          */
 198         if (!sun4i_drv_node_is_frontend(node) &&
 199             !of_device_is_available(node))
 200                 return 0;
 201
 202         if (!sun4i_drv_node_is_frontend(node)) {
 203                 /* Add current component */
 204                 DRM_DEBUG_DRIVER("Adding component %s\n",
 205                                  of_node_full_name(node));
 206                 drm_of_component_match_add(dev, match, compare_of, node);
 207                 count++;
 208         }
 209
 210         /* Inputs are listed first, then outputs */
 211         port = of_graph_get_port_by_id(node, 1);
 212         if (!port) {
 213                 DRM_DEBUG_DRIVER("No output to bind\n");
 214                 return count;
 215         }
 216
 217         for_each_available_child_of_node(port, ep) {
 218                 remote = of_graph_get_remote_port_parent(ep);
 219                 if (!remote) {
 220                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 221                         of_node_put(remote);
 222                         continue;
 223                 }
 224
 225                 /*
 226                  * If the node is our TCON, the first port is used for
 227                  * panel or bridges, and will not be part of the
 228                  * component framework.
 229                  */
 230                 if (sun4i_drv_node_is_tcon(node)) {
 231                         struct of_endpoint endpoint;
 232
 233                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 234                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 235                                 continue;
 236                         }
 237
 238                         if (!endpoint.id) {
 239                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 240                                 continue;
 241                         }
 242                 }
 243
 244                 /* Walk down our tree */
 245                 count += sun4i_drv_add_endpoints(dev, match, remote);
 246
 247                 of_node_put(remote);
 248         }
 249
 250         return count;
 251 }
 252
 253 static int sun4i_drv_probe(struct platform_device *pdev)
 254 {
 255         struct component_match *match = NULL;
 256         struct device_node *np = pdev->dev.of_node;
 257         int i, count = 0;
 258
 259         for (i = 0;; i++) {
 260                 struct device_node *pipeline = of_parse_phandle(np,
 261                                                                 "allwinner,pipelines",
 262                                                                 i);
 263                 if (!pipeline)
 264                         break;
 265
 266                 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 267                                                 pipeline);
 268                 of_node_put(pipeline);
 269
 270                 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 271                                  count, i);
 272         }
 273
 274         if (count)
 275                 return component_master_add_with_match(&pdev->dev,
 276                                                        &sun4i_drv_master_ops,
 277                                                        match);
 278         else
 279                 return 0;
 280 }
 281
 282 static int sun4i_drv_remove(struct platform_device *pdev)
 283 {
 284         return 0;
 285 }
 286
 287 static const struct of_device_id sun4i_drv_of_table[] = {
 288         { .compatible = "allwinner,sun5i-a13-display-engine" },
 289         { .compatible = "allwinner,sun6i-a31-display-engine" },
 290         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 291         { .compatible = "allwinner,sun8i-a33-display-engine" },
 292         { }
 293 };
 294 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 295
 296 static struct platform_driver sun4i_drv_platform_driver = {
 297         .probe          = sun4i_drv_probe,
 298         .remove         = sun4i_drv_remove,
 299         .driver         = {
 300                 .name           = "sun4i-drm",
 301                 .of_match_table = sun4i_drv_of_table,
 302         },
 303 };
 304 module_platform_driver(sun4i_drv_platform_driver);
 305
 306 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 307 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 308 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 309 MODULE_LICENSE("GPL");