drivers/gpu/host1x/drm/fb.c

   1 /*
   2  * Copyright (C) 2012-2013 Avionic Design GmbH
   3  * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
   4  *
   5  * Based on the KMS/FB CMA helpers
   6  *   Copyright (C) 2012 Analog Device Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14
  15 #include "drm.h"
  16 #include "gem.h"
  17
  18 static inline struct tegra_fb *to_tegra_fb(struct drm_framebuffer *fb)
  19 {
  20         return container_of(fb, struct tegra_fb, base);
  21 }
  22
  23 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
  24 {
  25         return container_of(helper, struct tegra_fbdev, base);
  26 }
  27
  28 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
  29                                     unsigned int index)
  30 {
  31         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  32
  33         if (index >= drm_format_num_planes(framebuffer->pixel_format))
  34                 return NULL;
  35
  36         return fb->planes[index];
  37 }
  38
  39 static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
  40 {
  41         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  42         unsigned int i;
  43
  44         for (i = 0; i < fb->num_planes; i++) {
  45                 struct tegra_bo *bo = fb->planes[i];
  46
  47                 if (bo)
  48                         drm_gem_object_unreference_unlocked(&bo->gem);
  49         }
  50
  51         drm_framebuffer_cleanup(framebuffer);
  52         kfree(fb->planes);
  53         kfree(fb);
  54 }
  55
  56 static int tegra_fb_create_handle(struct drm_framebuffer *framebuffer,
  57                                   struct drm_file *file, unsigned int *handle)
  58 {
  59         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  60
  61         return drm_gem_handle_create(file, &fb->planes[0]->gem, handle);
  62 }
  63
  64 static struct drm_framebuffer_funcs tegra_fb_funcs = {
  65         .destroy = tegra_fb_destroy,
  66         .create_handle = tegra_fb_create_handle,
  67 };
  68
  69 static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
  70                                        struct drm_mode_fb_cmd2 *mode_cmd,
  71                                        struct tegra_bo **planes,
  72                                        unsigned int num_planes)
  73 {
  74         struct tegra_fb *fb;
  75         unsigned int i;
  76         int err;
  77
  78         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  79         if (!fb)
  80                 return ERR_PTR(-ENOMEM);
  81
  82         fb->planes = kzalloc(num_planes * sizeof(*planes), GFP_KERNEL);
  83         if (!fb->planes)
  84                 return ERR_PTR(-ENOMEM);
  85
  86         fb->num_planes = num_planes;
  87
  88         drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
  89
  90         for (i = 0; i < fb->num_planes; i++)
  91                 fb->planes[i] = planes[i];
  92
  93         err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
  94         if (err < 0) {
  95                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
  96                         err);
  97                 kfree(fb->planes);
  98                 kfree(fb);
  99                 return ERR_PTR(err);
 100         }
 101
 102         return fb;
 103 }
 104
 105 static struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 106                                                struct drm_file *file,
 107                                                struct drm_mode_fb_cmd2 *cmd)
 108 {
 109         unsigned int hsub, vsub, i;
 110         struct tegra_bo *planes[4];
 111         struct drm_gem_object *gem;
 112         struct tegra_fb *fb;
 113         int err;
 114
 115         hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
 116         vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
 117
 118         for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
 119                 unsigned int width = cmd->width / (i ? hsub : 1);
 120                 unsigned int height = cmd->height / (i ? vsub : 1);
 121                 unsigned int size, bpp;
 122
 123                 gem = drm_gem_object_lookup(drm, file, cmd->handles[i]);
 124                 if (!gem) {
 125                         err = -ENXIO;
 126                         goto unreference;
 127                 }
 128
 129                 bpp = drm_format_plane_cpp(cmd->pixel_format, i);
 130
 131                 size = (height - 1) * cmd->pitches[i] +
 132                        width * bpp + cmd->offsets[i];
 133
 134                 if (gem->size < size) {
 135                         err = -EINVAL;
 136                         goto unreference;
 137                 }
 138
 139                 planes[i] = to_tegra_bo(gem);
 140         }
 141
 142         fb = tegra_fb_alloc(drm, cmd, planes, i);
 143         if (IS_ERR(fb)) {
 144                 err = PTR_ERR(fb);
 145                 goto unreference;
 146         }
 147
 148         return &fb->base;
 149
 150 unreference:
 151         while (i--)
 152                 drm_gem_object_unreference_unlocked(&planes[i]->gem);
 153
 154         return ERR_PTR(err);
 155 }
 156
 157 static struct fb_ops tegra_fb_ops = {
 158         .owner = THIS_MODULE,
 159         .fb_fillrect = sys_fillrect,
 160         .fb_copyarea = sys_copyarea,
 161         .fb_imageblit = sys_imageblit,
 162         .fb_check_var = drm_fb_helper_check_var,
 163         .fb_set_par = drm_fb_helper_set_par,
 164         .fb_blank = drm_fb_helper_blank,
 165         .fb_pan_display = drm_fb_helper_pan_display,
 166         .fb_setcmap = drm_fb_helper_setcmap,
 167 };
 168
 169 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 170                              struct drm_fb_helper_surface_size *sizes)
 171 {
 172         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 173         struct drm_device *drm = helper->dev;
 174         struct drm_mode_fb_cmd2 cmd = { 0 };
 175         unsigned int bytes_per_pixel;
 176         struct drm_framebuffer *fb;
 177         unsigned long offset;
 178         struct fb_info *info;
 179         struct tegra_bo *bo;
 180         size_t size;
 181         int err;
 182
 183         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 184
 185         cmd.width = sizes->surface_width;
 186         cmd.height = sizes->surface_height;
 187         cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
 188         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 189                                                      sizes->surface_depth);
 190
 191         size = cmd.pitches[0] * cmd.height;
 192
 193         bo = tegra_bo_create(drm, size);
 194         if (IS_ERR(bo))
 195                 return PTR_ERR(bo);
 196
 197         info = framebuffer_alloc(0, drm->dev);
 198         if (!info) {
 199                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 200                 tegra_bo_free_object(&bo->gem);
 201                 return -ENOMEM;
 202         }
 203
 204         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 205         if (IS_ERR(fbdev->fb)) {
 206                 dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
 207                 err = PTR_ERR(fbdev->fb);
 208                 goto release;
 209         }
 210
 211         fb = &fbdev->fb->base;
 212         helper->fb = fb;
 213         helper->fbdev = info;
 214
 215         info->par = helper;
 216         info->flags = FBINFO_FLAG_DEFAULT;
 217         info->fbops = &tegra_fb_ops;
 218
 219         err = fb_alloc_cmap(&info->cmap, 256, 0);
 220         if (err < 0) {
 221                 dev_err(drm->dev, "failed to allocate color map: %d\n", err);
 222                 goto destroy;
 223         }
 224
 225         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 226         drm_fb_helper_fill_var(info, helper, fb->width, fb->height);
 227
 228         offset = info->var.xoffset * bytes_per_pixel +
 229                  info->var.yoffset * fb->pitches[0];
 230
 231         drm->mode_config.fb_base = (resource_size_t)bo->paddr;
 232         info->screen_base = bo->vaddr + offset;
 233         info->screen_size = size;
 234         info->fix.smem_start = (unsigned long)(bo->paddr + offset);
 235         info->fix.smem_len = size;
 236
 237         return 0;
 238
 239 destroy:
 240         drm_framebuffer_unregister_private(fb);
 241         tegra_fb_destroy(fb);
 242 release:
 243         framebuffer_release(info);
 244         return err;
 245 }
 246
 247 static struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 248         .fb_probe = tegra_fbdev_probe,
 249 };
 250
 251 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm,
 252                                               unsigned int preferred_bpp,
 253                                               unsigned int num_crtc,
 254                                               unsigned int max_connectors)
 255 {
 256         struct drm_fb_helper *helper;
 257         struct tegra_fbdev *fbdev;
 258         int err;
 259
 260         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 261         if (!fbdev) {
 262                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 263                 return ERR_PTR(-ENOMEM);
 264         }
 265
 266         fbdev->base.funcs = &tegra_fb_helper_funcs;
 267         helper = &fbdev->base;
 268
 269         err = drm_fb_helper_init(drm, &fbdev->base, num_crtc, max_connectors);
 270         if (err < 0) {
 271                 dev_err(drm->dev, "failed to initialize DRM FB helper\n");
 272                 goto free;
 273         }
 274
 275         err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
 276         if (err < 0) {
 277                 dev_err(drm->dev, "failed to add connectors\n");
 278                 goto fini;
 279         }
 280
 281         drm_helper_disable_unused_functions(drm);
 282
 283         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 284         if (err < 0) {
 285                 dev_err(drm->dev, "failed to set initial configuration\n");
 286                 goto fini;
 287         }
 288
 289         return fbdev;
 290
 291 fini:
 292         drm_fb_helper_fini(&fbdev->base);
 293 free:
 294         kfree(fbdev);
 295         return ERR_PTR(err);
 296 }
 297
 298 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 299 {
 300         struct fb_info *info = fbdev->base.fbdev;
 301
 302         if (info) {
 303                 int err;
 304
 305                 err = unregister_framebuffer(info);
 306                 if (err < 0)
 307                         DRM_DEBUG_KMS("failed to unregister framebuffer\n");
 308
 309                 if (info->cmap.len)
 310                         fb_dealloc_cmap(&info->cmap);
 311
 312                 framebuffer_release(info);
 313         }
 314
 315         if (fbdev->fb) {
 316                 drm_framebuffer_unregister_private(&fbdev->fb->base);
 317                 tegra_fb_destroy(&fbdev->fb->base);
 318         }
 319
 320         drm_fb_helper_fini(&fbdev->base);
 321         kfree(fbdev);
 322 }
 323
 324 static void tegra_fb_output_poll_changed(struct drm_device *drm)
 325 {
 326         struct host1x_drm *host1x = drm->dev_private;
 327
 328         if (host1x->fbdev)
 329                 drm_fb_helper_hotplug_event(&host1x->fbdev->base);
 330 }
 331
 332 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 333         .fb_create = tegra_fb_create,
 334         .output_poll_changed = tegra_fb_output_poll_changed,
 335 };
 336
 337 int tegra_drm_fb_init(struct drm_device *drm)
 338 {
 339         struct host1x_drm *host1x = drm->dev_private;
 340         struct tegra_fbdev *fbdev;
 341
 342         drm->mode_config.min_width = 0;
 343         drm->mode_config.min_height = 0;
 344
 345         drm->mode_config.max_width = 4096;
 346         drm->mode_config.max_height = 4096;
 347
 348         drm->mode_config.funcs = &tegra_drm_mode_funcs;
 349
 350         fbdev = tegra_fbdev_create(drm, 32, drm->mode_config.num_crtc,
 351                                    drm->mode_config.num_connector);
 352         if (IS_ERR(fbdev))
 353                 return PTR_ERR(fbdev);
 354
 355         host1x->fbdev = fbdev;
 356
 357         return 0;
 358 }
 359
 360 void tegra_drm_fb_exit(struct drm_device *drm)
 361 {
 362         struct host1x_drm *host1x = drm->dev_private;
 363
 364         tegra_fbdev_free(host1x->fbdev);
 365 }
 366
 367 void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
 368 {
 369         if (fbdev) {
 370                 drm_modeset_lock_all(fbdev->base.dev);
 371                 drm_fb_helper_restore_fbdev_mode(&fbdev->base);
 372                 drm_modeset_unlock_all(fbdev->base.dev);
 373         }
 374 }