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 int
  50 exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct * vma)
  51 {
  52         int ret;
  53
  54         vma->vm_pgoff = 0;
  55         ret = dma_mmap_writecombine(info->device, vma, info->screen_base,
  56                         info->fix.smem_start, vma->vm_end - vma->vm_start);
  57         if (ret)
  58                 printk(KERN_ERR "Remapping memory failed, error: %d\n", ret);
  59
  60         return ret;
  61 }
  62
  63 static struct fb_ops exynos_drm_fb_ops = {
  64         .owner          = THIS_MODULE,
  65         .fb_mmap        = exynos_drm_fb_mmap,
  66         .fb_fillrect    = cfb_fillrect,
  67         .fb_copyarea    = cfb_copyarea,
  68         .fb_imageblit   = cfb_imageblit,
  69         .fb_check_var   = drm_fb_helper_check_var,
  70         .fb_set_par     = drm_fb_helper_set_par,
  71         .fb_blank       = drm_fb_helper_blank,
  72         .fb_pan_display = drm_fb_helper_pan_display,
  73         .fb_setcmap     = drm_fb_helper_setcmap,
  74 };
  75
  76 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  77                                      struct drm_framebuffer *fb)
  78 {
  79         struct fb_info *fbi = helper->fbdev;
  80         struct drm_device *dev = helper->dev;
  81         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  82         struct exynos_drm_gem_buf *buffer;
  83         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  84         unsigned long offset;
  85
  86         DRM_DEBUG_KMS("%s\n", __FILE__);
  87
  88         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  89         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  90
  91         /* RGB formats use only one buffer */
  92         buffer = exynos_drm_fb_buffer(exynos_fb, 0);
  93         if (!buffer) {
  94                 DRM_LOG_KMS("buffer is null.\n");
  95                 return -EFAULT;
  96         }
  97
  98         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
  99         offset += fbi->var.yoffset * fb->pitches[0];
 100
 101         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 102         fbi->screen_base = buffer->kvaddr + offset;
 103         fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
 104         fbi->screen_size = size;
 105         fbi->fix.smem_len = size;
 106
 107         return 0;
 108 }
 109
 110 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 111                                     struct drm_fb_helper_surface_size *sizes)
 112 {
 113         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 114         struct exynos_drm_gem_obj *exynos_gem_obj;
 115         struct exynos_drm_fb *exynos_fb;
 116         struct drm_device *dev = helper->dev;
 117         struct fb_info *fbi;
 118         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 119         struct platform_device *pdev = dev->platformdev;
 120         unsigned long size;
 121         int ret;
 122
 123         DRM_DEBUG_KMS("%s\n", __FILE__);
 124
 125         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 126                         sizes->surface_width, sizes->surface_height,
 127                         sizes->surface_bpp);
 128
 129         mode_cmd.width = sizes->surface_width;
 130         mode_cmd.height = sizes->surface_height;
 131         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 132         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 133                                                           sizes->surface_depth);
 134
 135         mutex_lock(&dev->struct_mutex);
 136
 137         fbi = framebuffer_alloc(0, &pdev->dev);
 138         if (!fbi) {
 139                 DRM_ERROR("failed to allocate fb info.\n");
 140                 ret = -ENOMEM;
 141                 goto out;
 142         }
 143
 144         size = mode_cmd.pitches[0] * mode_cmd.height;
 145
 146         /* 0 means to allocate physically continuous memory */
 147         exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
 148         if (IS_ERR(exynos_gem_obj)) {
 149                 ret = PTR_ERR(exynos_gem_obj);
 150                 goto out;
 151         }
 152
 153         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 154
 155         exynos_fb = exynos_drm_fb_init(dev, &mode_cmd);
 156         if (IS_ERR_OR_NULL(exynos_fb)) {
 157                 DRM_ERROR("failed to create drm framebuffer.\n");
 158                 ret = PTR_ERR(exynos_fb);
 159                 goto out;
 160         }
 161         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 162
 163         helper->fb = &exynos_fb->fb;
 164         helper->fbdev = fbi;
 165
 166         fbi->par = helper;
 167         fbi->flags = FBINFO_FLAG_DEFAULT;
 168         fbi->fbops = &exynos_drm_fb_ops;
 169
 170         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 171         if (ret) {
 172                 DRM_ERROR("failed to allocate cmap.\n");
 173                 goto out;
 174         }
 175
 176         ret = exynos_drm_fbdev_update(helper, helper->fb);
 177         if (ret < 0) {
 178                 fb_dealloc_cmap(&fbi->cmap);
 179                 goto out;
 180         }
 181
 182 /*
 183  * if failed, all resources allocated above would be released by
 184  * drm_mode_config_cleanup() when drm_load() had been called prior
 185  * to any specific driver such as fimd or hdmi driver.
 186  */
 187 out:
 188         mutex_unlock(&dev->struct_mutex);
 189         return ret;
 190 }
 191
 192 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 193                                    struct drm_fb_helper_surface_size *sizes)
 194 {
 195         int ret = 0;
 196
 197         DRM_DEBUG_KMS("%s\n", __FILE__);
 198
 199         /*
 200          * with !helper->fb, it means that this funcion is called first time
 201          * and after that, the helper->fb would be used as clone mode.
 202          */
 203         if (!helper->fb) {
 204                 ret = exynos_drm_fbdev_create(helper, sizes);
 205                 if (ret < 0) {
 206                         DRM_ERROR("failed to create fbdev.\n");
 207                         return ret;
 208                 }
 209
 210                 /*
 211                  * fb_helper expects a value more than 1 if succeed
 212                  * because register_framebuffer() should be called.
 213                  */
 214                 ret = 1;
 215         }
 216
 217         return ret;
 218 }
 219
 220 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 221         .fb_probe =     exynos_drm_fbdev_probe,
 222 };
 223
 224 int exynos_drm_fbdev_init(struct drm_device *dev)
 225 {
 226         struct exynos_drm_fbdev *fbdev;
 227         struct exynos_drm_private *private = dev->dev_private;
 228         struct drm_fb_helper *helper;
 229         unsigned int num_crtc;
 230         int ret;
 231
 232         DRM_DEBUG_KMS("%s\n", __FILE__);
 233
 234         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 235                 return 0;
 236
 237         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 238         if (!fbdev) {
 239                 DRM_ERROR("failed to allocate drm fbdev.\n");
 240                 return -ENOMEM;
 241         }
 242
 243         private->fb_helper = helper = &fbdev->drm_fb_helper;
 244         helper->funcs = &exynos_drm_fb_helper_funcs;
 245
 246         num_crtc = dev->mode_config.num_crtc;
 247
 248         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 249         if (ret < 0) {
 250                 DRM_ERROR("failed to initialize drm fb helper.\n");
 251                 goto err_init;
 252         }
 253
 254         ret = drm_fb_helper_single_add_all_connectors(helper);
 255         if (ret < 0) {
 256                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 257                 goto err_setup;
 258
 259         }
 260
 261         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 262         if (ret < 0) {
 263                 DRM_ERROR("failed to set up hw configuration.\n");
 264                 goto err_setup;
 265         }
 266
 267         return 0;
 268
 269 err_setup:
 270         drm_fb_helper_fini(helper);
 271
 272 err_init:
 273         private->fb_helper = NULL;
 274         kfree(fbdev);
 275
 276         return ret;
 277 }
 278
 279 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 280                                       struct drm_fb_helper *fb_helper)
 281 {
 282         struct drm_framebuffer *fb;
 283
 284         /* release drm framebuffer and real buffer */
 285         if (fb_helper->fb && fb_helper->fb->funcs) {
 286                 fb = fb_helper->fb;
 287                 if (fb && fb->funcs->destroy)
 288                         fb->funcs->destroy(fb);
 289         }
 290
 291         /* release linux framebuffer */
 292         if (fb_helper->fbdev) {
 293                 struct fb_info *info;
 294                 int ret;
 295
 296                 info = fb_helper->fbdev;
 297                 ret = unregister_framebuffer(info);
 298                 if (ret < 0)
 299                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 300
 301                 if (info->cmap.len)
 302                         fb_dealloc_cmap(&info->cmap);
 303
 304                 framebuffer_release(info);
 305         }
 306
 307         drm_fb_helper_fini(fb_helper);
 308 }
 309
 310 void exynos_drm_fbdev_fini(struct drm_device *dev)
 311 {
 312         struct exynos_drm_private *private = dev->dev_private;
 313         struct exynos_drm_fbdev *fbdev;
 314
 315         if (!private || !private->fb_helper)
 316                 return;
 317
 318         fbdev = to_exynos_fbdev(private->fb_helper);
 319
 320         if (fbdev->exynos_gem_obj)
 321                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 322
 323         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 324         kfree(fbdev);
 325         private->fb_helper = NULL;
 326 }
 327
 328 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 329 {
 330         struct exynos_drm_private *private = dev->dev_private;
 331
 332         if (!private || !private->fb_helper)
 333                 return;
 334
 335         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 336 }