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