drivers/gpu/drm/mgag200/mgag200_fb.c

   1 /*
   2  * Copyright 2010 Matt Turner.
   3  * Copyright 2012 Red Hat
   4  *
   5  * This file is subject to the terms and conditions of the GNU General
   6  * Public License version 2. See the file COPYING in the main
   7  * directory of this archive for more details.
   8  *
   9  * Authors: Matthew Garrett
  10  *          Matt Turner
  11  *          Dave Airlie
  12  */
  13 #include <linux/module.h>
  14 #include <drm/drmP.h>
  15 #include <drm/drm_fb_helper.h>
  16 #include <drm/drm_crtc_helper.h>
  17
  18 #include <linux/fb.h>
  19
  20 #include "mgag200_drv.h"
  21
  22 static void mga_dirty_update(struct mga_fbdev *mfbdev,
  23                              int x, int y, int width, int height)
  24 {
  25         int i;
  26         struct drm_gem_object *obj;
  27         struct mgag200_bo *bo;
  28         int src_offset, dst_offset;
  29         int bpp = (mfbdev->mfb.base.bits_per_pixel + 7)/8;
  30         int ret;
  31         bool unmap = false;
  32
  33         obj = mfbdev->mfb.obj;
  34         bo = gem_to_mga_bo(obj);
  35
  36         ret = mgag200_bo_reserve(bo, true);
  37         if (ret) {
  38                 DRM_ERROR("failed to reserve fb bo\n");
  39                 return;
  40         }
  41
  42         if (!bo->kmap.virtual) {
  43                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  44                 if (ret) {
  45                         DRM_ERROR("failed to kmap fb updates\n");
  46                         mgag200_bo_unreserve(bo);
  47                         return;
  48                 }
  49                 unmap = true;
  50         }
  51         for (i = y; i < y + height; i++) {
  52                 /* assume equal stride for now */
  53                 src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
  54                 memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, width * bpp);
  55
  56         }
  57         if (unmap)
  58                 ttm_bo_kunmap(&bo->kmap);
  59
  60         mgag200_bo_unreserve(bo);
  61 }
  62
  63 static void mga_fillrect(struct fb_info *info,
  64                          const struct fb_fillrect *rect)
  65 {
  66         struct mga_fbdev *mfbdev = info->par;
  67         sys_fillrect(info, rect);
  68         mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
  69                          rect->height);
  70 }
  71
  72 static void mga_copyarea(struct fb_info *info,
  73                          const struct fb_copyarea *area)
  74 {
  75         struct mga_fbdev *mfbdev = info->par;
  76         sys_copyarea(info, area);
  77         mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
  78                          area->height);
  79 }
  80
  81 static void mga_imageblit(struct fb_info *info,
  82                           const struct fb_image *image)
  83 {
  84         struct mga_fbdev *mfbdev = info->par;
  85         sys_imageblit(info, image);
  86         mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
  87                          image->height);
  88 }
  89
  90
  91 static struct fb_ops mgag200fb_ops = {
  92         .owner = THIS_MODULE,
  93         .fb_check_var = drm_fb_helper_check_var,
  94         .fb_set_par = drm_fb_helper_set_par,
  95         .fb_fillrect = mga_fillrect,
  96         .fb_copyarea = mga_copyarea,
  97         .fb_imageblit = mga_imageblit,
  98         .fb_pan_display = drm_fb_helper_pan_display,
  99         .fb_blank = drm_fb_helper_blank,
 100         .fb_setcmap = drm_fb_helper_setcmap,
 101 };
 102
 103 static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 104                                    struct drm_mode_fb_cmd2 *mode_cmd,
 105                                    struct drm_gem_object **gobj_p)
 106 {
 107         struct drm_device *dev = afbdev->helper.dev;
 108         u32 bpp, depth;
 109         u32 size;
 110         struct drm_gem_object *gobj;
 111
 112         int ret = 0;
 113         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
 114
 115         size = mode_cmd->pitches[0] * mode_cmd->height;
 116         ret = mgag200_gem_create(dev, size, true, &gobj);
 117         if (ret)
 118                 return ret;
 119
 120         *gobj_p = gobj;
 121         return ret;
 122 }
 123
 124 static int mgag200fb_create(struct drm_fb_helper *helper,
 125                            struct drm_fb_helper_surface_size *sizes)
 126 {
 127         struct mga_fbdev *mfbdev = (struct mga_fbdev *)helper;
 128         struct drm_device *dev = mfbdev->helper.dev;
 129         struct drm_mode_fb_cmd2 mode_cmd;
 130         struct mga_device *mdev = dev->dev_private;
 131         struct fb_info *info;
 132         struct drm_framebuffer *fb;
 133         struct drm_gem_object *gobj = NULL;
 134         struct device *device = &dev->pdev->dev;
 135         struct mgag200_bo *bo;
 136         int ret;
 137         void *sysram;
 138         int size;
 139
 140         mode_cmd.width = sizes->surface_width;
 141         mode_cmd.height = sizes->surface_height;
 142         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 143
 144         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 145                                                           sizes->surface_depth);
 146         size = mode_cmd.pitches[0] * mode_cmd.height;
 147
 148         ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 149         if (ret) {
 150                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 151                 return ret;
 152         }
 153         bo = gem_to_mga_bo(gobj);
 154
 155         sysram = vmalloc(size);
 156         if (!sysram)
 157                 return -ENOMEM;
 158
 159         info = framebuffer_alloc(0, device);
 160         if (info == NULL)
 161                 return -ENOMEM;
 162
 163         info->par = mfbdev;
 164
 165         ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 166         if (ret)
 167                 return ret;
 168
 169         mfbdev->sysram = sysram;
 170         mfbdev->size = size;
 171
 172         fb = &mfbdev->mfb.base;
 173
 174         /* setup helper */
 175         mfbdev->helper.fb = fb;
 176         mfbdev->helper.fbdev = info;
 177
 178         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 179         if (ret) {
 180                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 181                 ret = -ENOMEM;
 182                 goto out;
 183         }
 184
 185         strcpy(info->fix.id, "mgadrmfb");
 186
 187         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 188         info->fbops = &mgag200fb_ops;
 189
 190         /* setup aperture base/size for vesafb takeover */
 191         info->apertures = alloc_apertures(1);
 192         if (!info->apertures) {
 193                 ret = -ENOMEM;
 194                 goto out;
 195         }
 196         info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 197         info->apertures->ranges[0].size = mdev->mc.vram_size;
 198
 199         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 200         drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
 201                                sizes->fb_height);
 202
 203         info->screen_base = sysram;
 204         info->screen_size = size;
 205         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 206
 207         DRM_DEBUG_KMS("allocated %dx%d\n",
 208                       fb->width, fb->height);
 209         return 0;
 210 out:
 211         return ret;
 212 }
 213
 214 static int mga_fbdev_destroy(struct drm_device *dev,
 215                                 struct mga_fbdev *mfbdev)
 216 {
 217         struct fb_info *info;
 218         struct mga_framebuffer *mfb = &mfbdev->mfb;
 219
 220         if (mfbdev->helper.fbdev) {
 221                 info = mfbdev->helper.fbdev;
 222
 223                 unregister_framebuffer(info);
 224                 if (info->cmap.len)
 225                         fb_dealloc_cmap(&info->cmap);
 226                 framebuffer_release(info);
 227         }
 228
 229         if (mfb->obj) {
 230                 drm_gem_object_unreference_unlocked(mfb->obj);
 231                 mfb->obj = NULL;
 232         }
 233         drm_fb_helper_fini(&mfbdev->helper);
 234         vfree(mfbdev->sysram);
 235         drm_framebuffer_unregister_private(&mfb->base);
 236         drm_framebuffer_cleanup(&mfb->base);
 237
 238         return 0;
 239 }
 240
 241 static struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 242         .gamma_set = mga_crtc_fb_gamma_set,
 243         .gamma_get = mga_crtc_fb_gamma_get,
 244         .fb_probe = mgag200fb_create,
 245 };
 246
 247 int mgag200_fbdev_init(struct mga_device *mdev)
 248 {
 249         struct mga_fbdev *mfbdev;
 250         int ret;
 251
 252         mfbdev = kzalloc(sizeof(struct mga_fbdev), GFP_KERNEL);
 253         if (!mfbdev)
 254                 return -ENOMEM;
 255
 256         mdev->mfbdev = mfbdev;
 257         mfbdev->helper.funcs = &mga_fb_helper_funcs;
 258
 259         ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 260                                  mdev->num_crtc, MGAG200FB_CONN_LIMIT);
 261         if (ret) {
 262                 kfree(mfbdev);
 263                 return ret;
 264         }
 265         drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 266
 267         /* disable all the possible outputs/crtcs before entering KMS mode */
 268         drm_helper_disable_unused_functions(mdev->dev);
 269
 270         drm_fb_helper_initial_config(&mfbdev->helper, 32);
 271
 272         return 0;
 273 }
 274
 275 void mgag200_fbdev_fini(struct mga_device *mdev)
 276 {
 277         if (!mdev->mfbdev)
 278                 return;
 279
 280         mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 281         kfree(mdev->mfbdev);
 282         mdev->mfbdev = NULL;
 283 }