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 <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include <drm/drm_fb_helper.h>
  32 #include <drm/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
 129         /* 0 means to allocate physically continuous memory */
 130         exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
 131         if (IS_ERR(exynos_gem_obj)) {
 132                 ret = PTR_ERR(exynos_gem_obj);
 133                 goto out;
 134         }
 135
 136         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 137
 138         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 139                         &exynos_gem_obj->base);
 140         if (IS_ERR_OR_NULL(helper->fb)) {
 141                 DRM_ERROR("failed to create drm framebuffer.\n");
 142                 ret = PTR_ERR(helper->fb);
 143                 goto out;
 144         }
 145
 146         helper->fbdev = fbi;
 147
 148         fbi->par = helper;
 149         fbi->flags = FBINFO_FLAG_DEFAULT;
 150         fbi->fbops = &exynos_drm_fb_ops;
 151
 152         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 153         if (ret) {
 154                 DRM_ERROR("failed to allocate cmap.\n");
 155                 goto out;
 156         }
 157
 158         ret = exynos_drm_fbdev_update(helper, helper->fb);
 159         if (ret < 0) {
 160                 fb_dealloc_cmap(&fbi->cmap);
 161                 goto out;
 162         }
 163
 164 /*
 165  * if failed, all resources allocated above would be released by
 166  * drm_mode_config_cleanup() when drm_load() had been called prior
 167  * to any specific driver such as fimd or hdmi driver.
 168  */
 169 out:
 170         mutex_unlock(&dev->struct_mutex);
 171         return ret;
 172 }
 173
 174 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 175                                    struct drm_fb_helper_surface_size *sizes)
 176 {
 177         int ret = 0;
 178
 179         DRM_DEBUG_KMS("%s\n", __FILE__);
 180
 181         /*
 182          * with !helper->fb, it means that this funcion is called first time
 183          * and after that, the helper->fb would be used as clone mode.
 184          */
 185         if (!helper->fb) {
 186                 ret = exynos_drm_fbdev_create(helper, sizes);
 187                 if (ret < 0) {
 188                         DRM_ERROR("failed to create fbdev.\n");
 189                         return ret;
 190                 }
 191
 192                 /*
 193                  * fb_helper expects a value more than 1 if succeed
 194                  * because register_framebuffer() should be called.
 195                  */
 196                 ret = 1;
 197         }
 198
 199         return ret;
 200 }
 201
 202 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 203         .fb_probe =     exynos_drm_fbdev_probe,
 204 };
 205
 206 int exynos_drm_fbdev_init(struct drm_device *dev)
 207 {
 208         struct exynos_drm_fbdev *fbdev;
 209         struct exynos_drm_private *private = dev->dev_private;
 210         struct drm_fb_helper *helper;
 211         unsigned int num_crtc;
 212         int ret;
 213
 214         DRM_DEBUG_KMS("%s\n", __FILE__);
 215
 216         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 217                 return 0;
 218
 219         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 220         if (!fbdev) {
 221                 DRM_ERROR("failed to allocate drm fbdev.\n");
 222                 return -ENOMEM;
 223         }
 224
 225         private->fb_helper = helper = &fbdev->drm_fb_helper;
 226         helper->funcs = &exynos_drm_fb_helper_funcs;
 227
 228         num_crtc = dev->mode_config.num_crtc;
 229
 230         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 231         if (ret < 0) {
 232                 DRM_ERROR("failed to initialize drm fb helper.\n");
 233                 goto err_init;
 234         }
 235
 236         ret = drm_fb_helper_single_add_all_connectors(helper);
 237         if (ret < 0) {
 238                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 239                 goto err_setup;
 240
 241         }
 242
 243         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 244         if (ret < 0) {
 245                 DRM_ERROR("failed to set up hw configuration.\n");
 246                 goto err_setup;
 247         }
 248
 249         return 0;
 250
 251 err_setup:
 252         drm_fb_helper_fini(helper);
 253
 254 err_init:
 255         private->fb_helper = NULL;
 256         kfree(fbdev);
 257
 258         return ret;
 259 }
 260
 261 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 262                                       struct drm_fb_helper *fb_helper)
 263 {
 264         struct drm_framebuffer *fb;
 265
 266         /* release drm framebuffer and real buffer */
 267         if (fb_helper->fb && fb_helper->fb->funcs) {
 268                 fb = fb_helper->fb;
 269                 if (fb && fb->funcs->destroy)
 270                         fb->funcs->destroy(fb);
 271         }
 272
 273         /* release linux framebuffer */
 274         if (fb_helper->fbdev) {
 275                 struct fb_info *info;
 276                 int ret;
 277
 278                 info = fb_helper->fbdev;
 279                 ret = unregister_framebuffer(info);
 280                 if (ret < 0)
 281                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 282
 283                 if (info->cmap.len)
 284                         fb_dealloc_cmap(&info->cmap);
 285
 286                 framebuffer_release(info);
 287         }
 288
 289         drm_fb_helper_fini(fb_helper);
 290 }
 291
 292 void exynos_drm_fbdev_fini(struct drm_device *dev)
 293 {
 294         struct exynos_drm_private *private = dev->dev_private;
 295         struct exynos_drm_fbdev *fbdev;
 296
 297         if (!private || !private->fb_helper)
 298                 return;
 299
 300         fbdev = to_exynos_fbdev(private->fb_helper);
 301
 302         if (fbdev->exynos_gem_obj)
 303                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 304
 305         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 306         kfree(fbdev);
 307         private->fb_helper = NULL;
 308 }
 309
 310 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 311 {
 312         struct exynos_drm_private *private = dev->dev_private;
 313
 314         if (!private || !private->fb_helper)
 315                 return;
 316
 317         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 318 }