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_gem.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 exynos_drm_gem_obj       *exynos_gem_obj;
  47 };
  48
  49 static struct fb_ops exynos_drm_fb_ops = {
  50         .owner          = THIS_MODULE,
  51         .fb_fillrect    = cfb_fillrect,
  52         .fb_copyarea    = cfb_copyarea,
  53         .fb_imageblit   = cfb_imageblit,
  54         .fb_check_var   = drm_fb_helper_check_var,
  55         .fb_set_par     = drm_fb_helper_set_par,
  56         .fb_blank       = drm_fb_helper_blank,
  57         .fb_pan_display = drm_fb_helper_pan_display,
  58         .fb_setcmap     = drm_fb_helper_setcmap,
  59 };
  60
  61 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  62                                      struct drm_framebuffer *fb)
  63 {
  64         struct fb_info *fbi = helper->fbdev;
  65         struct drm_device *dev = helper->dev;
  66         struct exynos_drm_gem_buf *buffer;
  67         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  68         unsigned long offset;
  69
  70         DRM_DEBUG_KMS("%s\n", __FILE__);
  71
  72         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  73         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  74
  75         /* RGB formats use only one buffer */
  76         buffer = exynos_drm_fb_buffer(fb, 0);
  77         if (!buffer) {
  78                 DRM_LOG_KMS("buffer is null.\n");
  79                 return -EFAULT;
  80         }
  81
  82         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
  83         offset += fbi->var.yoffset * fb->pitches[0];
  84
  85         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
  86         fbi->screen_base = buffer->kvaddr + offset;
  87         fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
  88         fbi->screen_size = size;
  89         fbi->fix.smem_len = size;
  90
  91         return 0;
  92 }
  93
  94 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
  95                                     struct drm_fb_helper_surface_size *sizes)
  96 {
  97         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
  98         struct exynos_drm_gem_obj *exynos_gem_obj;
  99         struct drm_device *dev = helper->dev;
 100         struct fb_info *fbi;
 101         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 102         struct platform_device *pdev = dev->platformdev;
 103         unsigned long size;
 104         int ret;
 105
 106         DRM_DEBUG_KMS("%s\n", __FILE__);
 107
 108         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 109                         sizes->surface_width, sizes->surface_height,
 110                         sizes->surface_bpp);
 111
 112         mode_cmd.width = sizes->surface_width;
 113         mode_cmd.height = sizes->surface_height;
 114         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 115         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 116                                                           sizes->surface_depth);
 117
 118         mutex_lock(&dev->struct_mutex);
 119
 120         fbi = framebuffer_alloc(0, &pdev->dev);
 121         if (!fbi) {
 122                 DRM_ERROR("failed to allocate fb info.\n");
 123                 ret = -ENOMEM;
 124                 goto out;
 125         }
 126
 127         size = mode_cmd.pitches[0] * mode_cmd.height;
 128         exynos_gem_obj = exynos_drm_gem_create(dev, size);
 129         if (IS_ERR(exynos_gem_obj)) {
 130                 ret = PTR_ERR(exynos_gem_obj);
 131                 goto out;
 132         }
 133
 134         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 135
 136         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 137                         &exynos_gem_obj->base);
 138         if (IS_ERR_OR_NULL(helper->fb)) {
 139                 DRM_ERROR("failed to create drm framebuffer.\n");
 140                 ret = PTR_ERR(helper->fb);
 141                 goto out;
 142         }
 143
 144         helper->fbdev = fbi;
 145
 146         fbi->par = helper;
 147         fbi->flags = FBINFO_FLAG_DEFAULT;
 148         fbi->fbops = &exynos_drm_fb_ops;
 149
 150         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 151         if (ret) {
 152                 DRM_ERROR("failed to allocate cmap.\n");
 153                 goto out;
 154         }
 155
 156         ret = exynos_drm_fbdev_update(helper, helper->fb);
 157         if (ret < 0) {
 158                 fb_dealloc_cmap(&fbi->cmap);
 159                 goto out;
 160         }
 161
 162 /*
 163  * if failed, all resources allocated above would be released by
 164  * drm_mode_config_cleanup() when drm_load() had been called prior
 165  * to any specific driver such as fimd or hdmi driver.
 166  */
 167 out:
 168         mutex_unlock(&dev->struct_mutex);
 169         return ret;
 170 }
 171
 172 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 173                                    struct drm_fb_helper_surface_size *sizes)
 174 {
 175         int ret = 0;
 176
 177         DRM_DEBUG_KMS("%s\n", __FILE__);
 178
 179         /*
 180          * with !helper->fb, it means that this funcion is called first time
 181          * and after that, the helper->fb would be used as clone mode.
 182          */
 183         if (!helper->fb) {
 184                 ret = exynos_drm_fbdev_create(helper, sizes);
 185                 if (ret < 0) {
 186                         DRM_ERROR("failed to create fbdev.\n");
 187                         return ret;
 188                 }
 189
 190                 /*
 191                  * fb_helper expects a value more than 1 if succeed
 192                  * because register_framebuffer() should be called.
 193                  */
 194                 ret = 1;
 195         }
 196
 197         return ret;
 198 }
 199
 200 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 201         .fb_probe =     exynos_drm_fbdev_probe,
 202 };
 203
 204 int exynos_drm_fbdev_init(struct drm_device *dev)
 205 {
 206         struct exynos_drm_fbdev *fbdev;
 207         struct exynos_drm_private *private = dev->dev_private;
 208         struct drm_fb_helper *helper;
 209         unsigned int num_crtc;
 210         int ret;
 211
 212         DRM_DEBUG_KMS("%s\n", __FILE__);
 213
 214         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 215                 return 0;
 216
 217         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 218         if (!fbdev) {
 219                 DRM_ERROR("failed to allocate drm fbdev.\n");
 220                 return -ENOMEM;
 221         }
 222
 223         private->fb_helper = helper = &fbdev->drm_fb_helper;
 224         helper->funcs = &exynos_drm_fb_helper_funcs;
 225
 226         num_crtc = dev->mode_config.num_crtc;
 227
 228         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 229         if (ret < 0) {
 230                 DRM_ERROR("failed to initialize drm fb helper.\n");
 231                 goto err_init;
 232         }
 233
 234         ret = drm_fb_helper_single_add_all_connectors(helper);
 235         if (ret < 0) {
 236                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 237                 goto err_setup;
 238
 239         }
 240
 241         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 242         if (ret < 0) {
 243                 DRM_ERROR("failed to set up hw configuration.\n");
 244                 goto err_setup;
 245         }
 246
 247         return 0;
 248
 249 err_setup:
 250         drm_fb_helper_fini(helper);
 251
 252 err_init:
 253         private->fb_helper = NULL;
 254         kfree(fbdev);
 255
 256         return ret;
 257 }
 258
 259 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 260                                       struct drm_fb_helper *fb_helper)
 261 {
 262         struct drm_framebuffer *fb;
 263
 264         /* release drm framebuffer and real buffer */
 265         if (fb_helper->fb && fb_helper->fb->funcs) {
 266                 fb = fb_helper->fb;
 267                 if (fb && fb->funcs->destroy)
 268                         fb->funcs->destroy(fb);
 269         }
 270
 271         /* release linux framebuffer */
 272         if (fb_helper->fbdev) {
 273                 struct fb_info *info;
 274                 int ret;
 275
 276                 info = fb_helper->fbdev;
 277                 ret = unregister_framebuffer(info);
 278                 if (ret < 0)
 279                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 280
 281                 if (info->cmap.len)
 282                         fb_dealloc_cmap(&info->cmap);
 283
 284                 framebuffer_release(info);
 285         }
 286
 287         drm_fb_helper_fini(fb_helper);
 288 }
 289
 290 void exynos_drm_fbdev_fini(struct drm_device *dev)
 291 {
 292         struct exynos_drm_private *private = dev->dev_private;
 293         struct exynos_drm_fbdev *fbdev;
 294
 295         if (!private || !private->fb_helper)
 296                 return;
 297
 298         fbdev = to_exynos_fbdev(private->fb_helper);
 299
 300         if (fbdev->exynos_gem_obj)
 301                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 302
 303         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 304         kfree(fbdev);
 305         private->fb_helper = NULL;
 306 }
 307
 308 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 309 {
 310         struct exynos_drm_private *private = dev->dev_private;
 311
 312         if (!private || !private->fb_helper)
 313                 return;
 314
 315         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 316 }
 317
 318 int exynos_drm_fbdev_reinit(struct drm_device *dev)
 319 {
 320         struct exynos_drm_private *private = dev->dev_private;
 321         struct drm_fb_helper *fb_helper;
 322         int ret;
 323
 324         if (!private)
 325                 return -EINVAL;
 326
 327         /*
 328          * if all sub drivers were unloaded then num_connector is 0
 329          * so at this time, the framebuffers also should be destroyed.
 330          */
 331         if (!dev->mode_config.num_connector) {
 332                 exynos_drm_fbdev_fini(dev);
 333                 return 0;
 334         }
 335
 336         fb_helper = private->fb_helper;
 337
 338         if (fb_helper) {
 339                 struct list_head temp_list;
 340
 341                 INIT_LIST_HEAD(&temp_list);
 342
 343                 /*
 344                  * fb_helper is reintialized but kernel fb is reused
 345                  * so kernel_fb_list need to be backuped and restored
 346                  */
 347                 if (!list_empty(&fb_helper->kernel_fb_list))
 348                         list_replace_init(&fb_helper->kernel_fb_list,
 349                                         &temp_list);
 350
 351                 drm_fb_helper_fini(fb_helper);
 352
 353                 ret = drm_fb_helper_init(dev, fb_helper,
 354                                 dev->mode_config.num_crtc, MAX_CONNECTOR);
 355                 if (ret < 0) {
 356                         DRM_ERROR("failed to initialize drm fb helper\n");
 357                         return ret;
 358                 }
 359
 360                 if (!list_empty(&temp_list))
 361                         list_replace(&temp_list, &fb_helper->kernel_fb_list);
 362
 363                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
 364                 if (ret < 0) {
 365                         DRM_ERROR("failed to add fb helper to connectors\n");
 366                         goto err;
 367                 }
 368
 369                 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
 370                 if (ret < 0) {
 371                         DRM_ERROR("failed to set up hw configuration.\n");
 372                         goto err;
 373                 }
 374         } else {
 375                 /*
 376                  * if drm_load() failed whem drm load() was called prior
 377                  * to specific drivers, fb_helper must be NULL and so
 378                  * this fuction should be called again to re-initialize and
 379                  * re-configure the fb helper. it means that this function
 380                  * has been called by the specific drivers.
 381                  */
 382                 ret = exynos_drm_fbdev_init(dev);
 383         }
 384
 385         return ret;
 386
 387 err:
 388         /*
 389          * if drm_load() failed when drm load() was called prior
 390          * to specific drivers, the fb_helper must be NULL and so check it.
 391          */
 392         if (fb_helper)
 393                 drm_fb_helper_fini(fb_helper);
 394
 395         return ret;
 396 }
 397
 398 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 399 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 400 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 401 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
 402 MODULE_LICENSE("GPL");