drivers/gpu/drm/exynos/exynos_drm_fbdev.c

   1 /* exynos_drm_fbdev.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26  * OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include "drmP.h"
  30 #include "drm_crtc.h"
  31 #include "drm_fb_helper.h"
  32 #include "drm_crtc_helper.h"
  33
  34 #include "exynos_drm_drv.h"
  35 #include "exynos_drm_fb.h"
  36 #include "exynos_drm_buf.h"
  37
  38 #define MAX_CONNECTOR           4
  39 #define PREFERRED_BPP           32
  40
  41 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  42                                 drm_fb_helper)
  43
  44 struct exynos_drm_fbdev {
  45         struct drm_fb_helper    drm_fb_helper;
  46         struct drm_framebuffer  *fb;
  47 };
  48
  49 static int exynos_drm_fbdev_set_par(struct fb_info *info)
  50 {
  51         struct fb_var_screeninfo *var = &info->var;
  52
  53         switch (var->bits_per_pixel) {
  54         case 32:
  55         case 24:
  56         case 18:
  57         case 16:
  58         case 12:
  59                 info->fix.visual = FB_VISUAL_TRUECOLOR;
  60                 break;
  61         case 1:
  62                 info->fix.visual = FB_VISUAL_MONO01;
  63                 break;
  64         default:
  65                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  66                 break;
  67         }
  68
  69         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
  70
  71         return drm_fb_helper_set_par(info);
  72 }
  73
  74
  75 static struct fb_ops exynos_drm_fb_ops = {
  76         .owner          = THIS_MODULE,
  77         .fb_fillrect    = cfb_fillrect,
  78         .fb_copyarea    = cfb_copyarea,
  79         .fb_imageblit   = cfb_imageblit,
  80         .fb_check_var   = drm_fb_helper_check_var,
  81         .fb_set_par     = exynos_drm_fbdev_set_par,
  82         .fb_blank       = drm_fb_helper_blank,
  83         .fb_pan_display = drm_fb_helper_pan_display,
  84         .fb_setcmap     = drm_fb_helper_setcmap,
  85 };
  86
  87 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  88                                      struct drm_framebuffer *fb,
  89                                      unsigned int fb_width,
  90                                      unsigned int fb_height)
  91 {
  92         struct fb_info *fbi = helper->fbdev;
  93         struct drm_device *dev = helper->dev;
  94         struct exynos_drm_fbdev *exynos_fb = to_exynos_fbdev(helper);
  95         struct exynos_drm_buf_entry *entry;
  96         unsigned int size = fb_width * fb_height * (fb->bits_per_pixel >> 3);
  97         unsigned long offset;
  98
  99         DRM_DEBUG_KMS("%s\n", __FILE__);
 100
 101         exynos_fb->fb = fb;
 102
 103         drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
 104         drm_fb_helper_fill_var(fbi, helper, fb_width, fb_height);
 105
 106         entry = exynos_drm_fb_get_buf(fb);
 107         if (!entry) {
 108                 DRM_LOG_KMS("entry is null.\n");
 109                 return -EFAULT;
 110         }
 111
 112         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 113         offset += fbi->var.yoffset * fb->pitch;
 114
 115         dev->mode_config.fb_base = entry->paddr;
 116         fbi->screen_base = entry->vaddr + offset;
 117         fbi->fix.smem_start = entry->paddr + offset;
 118         fbi->screen_size = size;
 119         fbi->fix.smem_len = size;
 120
 121         return 0;
 122 }
 123
 124 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 125                                     struct drm_fb_helper_surface_size *sizes)
 126 {
 127         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 128         struct drm_device *dev = helper->dev;
 129         struct fb_info *fbi;
 130         struct drm_mode_fb_cmd mode_cmd = { 0 };
 131         struct platform_device *pdev = dev->platformdev;
 132         int ret;
 133
 134         DRM_DEBUG_KMS("%s\n", __FILE__);
 135
 136         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 137                         sizes->surface_width, sizes->surface_height,
 138                         sizes->surface_bpp);
 139
 140         mode_cmd.width = sizes->surface_width;
 141         mode_cmd.height = sizes->surface_height;
 142         mode_cmd.bpp = sizes->surface_bpp;
 143         mode_cmd.depth = sizes->surface_depth;
 144
 145         mutex_lock(&dev->struct_mutex);
 146
 147         fbi = framebuffer_alloc(0, &pdev->dev);
 148         if (!fbi) {
 149                 DRM_ERROR("failed to allocate fb info.\n");
 150                 ret = -ENOMEM;
 151                 goto out;
 152         }
 153
 154         exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
 155         if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
 156                 DRM_ERROR("failed to create drm framebuffer.\n");
 157                 ret = PTR_ERR(exynos_fbdev->fb);
 158                 goto out;
 159         }
 160
 161         helper->fb = exynos_fbdev->fb;
 162         helper->fbdev = fbi;
 163
 164         fbi->par = helper;
 165         fbi->flags = FBINFO_FLAG_DEFAULT;
 166         fbi->fbops = &exynos_drm_fb_ops;
 167
 168         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 169         if (ret) {
 170                 DRM_ERROR("failed to allocate cmap.\n");
 171                 goto out;
 172         }
 173
 174         ret = exynos_drm_fbdev_update(helper, helper->fb, sizes->fb_width,
 175                         sizes->fb_height);
 176         if (ret < 0)
 177                 fb_dealloc_cmap(&fbi->cmap);
 178
 179 /*
 180  * if failed, all resources allocated above would be released by
 181  * drm_mode_config_cleanup() when drm_load() had been called prior
 182  * to any specific driver such as fimd or hdmi driver.
 183  */
 184 out:
 185         mutex_unlock(&dev->struct_mutex);
 186         return ret;
 187 }
 188
 189 static bool
 190 exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
 191                             struct drm_fb_helper_surface_size *sizes)
 192 {
 193         if (fb->width != sizes->surface_width)
 194                 return false;
 195         if (fb->height != sizes->surface_height)
 196                 return false;
 197         if (fb->bits_per_pixel != sizes->surface_bpp)
 198                 return false;
 199         if (fb->depth != sizes->surface_depth)
 200                 return false;
 201
 202         return true;
 203 }
 204
 205 static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
 206                                       struct drm_fb_helper_surface_size *sizes)
 207 {
 208         struct drm_device *dev = helper->dev;
 209         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 210         struct drm_framebuffer *fb = exynos_fbdev->fb;
 211         struct drm_mode_fb_cmd mode_cmd = { 0 };
 212
 213         DRM_DEBUG_KMS("%s\n", __FILE__);
 214
 215         if (helper->fb != fb) {
 216                 DRM_ERROR("drm framebuffer is different\n");
 217                 return -EINVAL;
 218         }
 219
 220         if (exynos_drm_fbdev_is_samefb(fb, sizes))
 221                 return 0;
 222
 223         mode_cmd.width = sizes->surface_width;
 224         mode_cmd.height = sizes->surface_height;
 225         mode_cmd.bpp = sizes->surface_bpp;
 226         mode_cmd.depth = sizes->surface_depth;
 227
 228         if (fb->funcs->destroy)
 229                 fb->funcs->destroy(fb);
 230
 231         exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
 232         if (IS_ERR(exynos_fbdev->fb)) {
 233                 DRM_ERROR("failed to allocate fb.\n");
 234                 return PTR_ERR(exynos_fbdev->fb);
 235         }
 236
 237         helper->fb = exynos_fbdev->fb;
 238         return exynos_drm_fbdev_update(helper, helper->fb, sizes->fb_width,
 239                         sizes->fb_height);
 240 }
 241
 242 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 243                                    struct drm_fb_helper_surface_size *sizes)
 244 {
 245         int ret = 0;
 246
 247         DRM_DEBUG_KMS("%s\n", __FILE__);
 248
 249         if (!helper->fb) {
 250                 ret = exynos_drm_fbdev_create(helper, sizes);
 251                 if (ret < 0) {
 252                         DRM_ERROR("failed to create fbdev.\n");
 253                         return ret;
 254                 }
 255
 256                 /*
 257                  * fb_helper expects a value more than 1 if succeed
 258                  * because register_framebuffer() should be called.
 259                  */
 260                 ret = 1;
 261         } else {
 262                 ret = exynos_drm_fbdev_recreate(helper, sizes);
 263                 if (ret < 0) {
 264                         DRM_ERROR("failed to reconfigure fbdev\n");
 265                         return ret;
 266                 }
 267         }
 268
 269         return ret;
 270 }
 271
 272 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 273         .fb_probe =     exynos_drm_fbdev_probe,
 274 };
 275
 276 int exynos_drm_fbdev_init(struct drm_device *dev)
 277 {
 278         struct exynos_drm_fbdev *fbdev;
 279         struct exynos_drm_private *private = dev->dev_private;
 280         struct drm_fb_helper *helper;
 281         unsigned int num_crtc;
 282         int ret;
 283
 284         DRM_DEBUG_KMS("%s\n", __FILE__);
 285
 286         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 287                 return 0;
 288
 289         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 290         if (!fbdev) {
 291                 DRM_ERROR("failed to allocate drm fbdev.\n");
 292                 return -ENOMEM;
 293         }
 294
 295         private->fb_helper = helper = &fbdev->drm_fb_helper;
 296         helper->funcs = &exynos_drm_fb_helper_funcs;
 297
 298         num_crtc = dev->mode_config.num_crtc;
 299
 300         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 301         if (ret < 0) {
 302                 DRM_ERROR("failed to initialize drm fb helper.\n");
 303                 goto err_init;
 304         }
 305
 306         ret = drm_fb_helper_single_add_all_connectors(helper);
 307         if (ret < 0) {
 308                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 309                 goto err_setup;
 310
 311         }
 312
 313         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 314         if (ret < 0) {
 315                 DRM_ERROR("failed to set up hw configuration.\n");
 316                 goto err_setup;
 317         }
 318
 319         return 0;
 320
 321 err_setup:
 322         drm_fb_helper_fini(helper);
 323
 324 err_init:
 325         private->fb_helper = NULL;
 326         kfree(fbdev);
 327
 328         return ret;
 329 }
 330
 331 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 332                                       struct drm_fb_helper *fb_helper)
 333 {
 334         struct drm_framebuffer *fb;
 335
 336         /* release drm framebuffer and real buffer */
 337         if (fb_helper->fb && fb_helper->fb->funcs) {
 338                 fb = fb_helper->fb;
 339                 if (fb && fb->funcs->destroy)
 340                         fb->funcs->destroy(fb);
 341         }
 342
 343         /* release linux framebuffer */
 344         if (fb_helper->fbdev) {
 345                 struct fb_info *info;
 346                 int ret;
 347
 348                 info = fb_helper->fbdev;
 349                 ret = unregister_framebuffer(info);
 350                 if (ret < 0)
 351                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 352
 353                 if (info->cmap.len)
 354                         fb_dealloc_cmap(&info->cmap);
 355
 356                 framebuffer_release(info);
 357         }
 358
 359         drm_fb_helper_fini(fb_helper);
 360 }
 361
 362 void exynos_drm_fbdev_fini(struct drm_device *dev)
 363 {
 364         struct exynos_drm_private *private = dev->dev_private;
 365         struct exynos_drm_fbdev *fbdev;
 366
 367         if (!private || !private->fb_helper)
 368                 return;
 369
 370         fbdev = to_exynos_fbdev(private->fb_helper);
 371
 372         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 373         kfree(fbdev);
 374         private->fb_helper = NULL;
 375 }
 376
 377 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 378 {
 379         struct exynos_drm_private *private = dev->dev_private;
 380
 381         if (!private || !private->fb_helper)
 382                 return;
 383
 384         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 385 }
 386
 387 int exynos_drm_fbdev_reinit(struct drm_device *dev)
 388 {
 389         struct exynos_drm_private *private = dev->dev_private;
 390         struct drm_fb_helper *fb_helper;
 391         int ret;
 392
 393         if (!private)
 394                 return -EINVAL;
 395
 396         /*
 397          * if all sub drivers were unloaded then num_connector is 0
 398          * so at this time, the framebuffers also should be destroyed.
 399          */
 400         if (!dev->mode_config.num_connector) {
 401                 exynos_drm_fbdev_fini(dev);
 402                 return 0;
 403         }
 404
 405         fb_helper = private->fb_helper;
 406
 407         if (fb_helper) {
 408                 drm_fb_helper_fini(fb_helper);
 409
 410                 ret = drm_fb_helper_init(dev, fb_helper,
 411                                 dev->mode_config.num_crtc, MAX_CONNECTOR);
 412                 if (ret < 0) {
 413                         DRM_ERROR("failed to initialize drm fb helper\n");
 414                         return ret;
 415                 }
 416
 417                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
 418                 if (ret < 0) {
 419                         DRM_ERROR("failed to add fb helper to connectors\n");
 420                         goto err;
 421                 }
 422
 423                 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
 424                 if (ret < 0) {
 425                         DRM_ERROR("failed to set up hw configuration.\n");
 426                         goto err;
 427                 }
 428         } else {
 429                 /*
 430                  * if drm_load() failed whem drm load() was called prior
 431                  * to specific drivers, fb_helper must be NULL and so
 432                  * this fuction should be called again to re-initialize and
 433                  * re-configure the fb helper. it means that this function
 434                  * has been called by the specific drivers.
 435                  */
 436                 ret = exynos_drm_fbdev_init(dev);
 437         }
 438
 439         return ret;
 440
 441 err:
 442         /*
 443          * if drm_load() failed when drm load() was called prior
 444          * to specific drivers, the fb_helper must be NULL and so check it.
 445          */
 446         if (fb_helper)
 447                 drm_fb_helper_fini(fb_helper);
 448
 449         return ret;
 450 }
 451
 452 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 453 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 454 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 455 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
 456 MODULE_LICENSE("GPL");