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
  17 #include <linux/fb.h>
  18
  19 #include "mgag200_drv.h"
  20
  21 static void mga_dirty_update(struct mga_fbdev *mfbdev,
  22                              int x, int y, int width, int height)
  23 {
  24         int i;
  25         struct drm_gem_object *obj;
  26         struct mgag200_bo *bo;
  27         int src_offset, dst_offset;
  28         int bpp = (mfbdev->mfb.base.bits_per_pixel + 7)/8;
  29         int ret;
  30         bool unmap = false;
  31
  32         obj = mfbdev->mfb.obj;
  33         bo = gem_to_mga_bo(obj);
  34
  35         ret = mgag200_bo_reserve(bo, true);
  36         if (ret) {
  37                 DRM_ERROR("failed to reserve fb bo\n");
  38                 return;
  39         }
  40
  41         if (!bo->kmap.virtual) {
  42                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  43                 if (ret) {
  44                         DRM_ERROR("failed to kmap fb updates\n");
  45                         mgag200_bo_unreserve(bo);
  46                         return;
  47                 }
  48                 unmap = true;
  49         }
  50         for (i = y; i < y + height; i++) {
  51                 /* assume equal stride for now */
  52                 src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
  53                 memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, width * bpp);
  54
  55         }
  56         if (unmap)
  57                 ttm_bo_kunmap(&bo->kmap);
  58
  59         mgag200_bo_unreserve(bo);
  60 }
  61
  62 static void mga_fillrect(struct fb_info *info,
  63                          const struct fb_fillrect *rect)
  64 {
  65         struct mga_fbdev *mfbdev = info->par;
  66         sys_fillrect(info, rect);
  67         mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
  68                          rect->height);
  69 }
  70
  71 static void mga_copyarea(struct fb_info *info,
  72                          const struct fb_copyarea *area)
  73 {
  74         struct mga_fbdev *mfbdev = info->par;
  75         sys_copyarea(info, area);
  76         mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
  77                          area->height);
  78 }
  79
  80 static void mga_imageblit(struct fb_info *info,
  81                           const struct fb_image *image)
  82 {
  83         struct mga_fbdev *mfbdev = info->par;
  84         sys_imageblit(info, image);
  85         mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
  86                          image->height);
  87 }
  88
  89
  90 static struct fb_ops mgag200fb_ops = {
  91         .owner = THIS_MODULE,
  92         .fb_check_var = drm_fb_helper_check_var,
  93         .fb_set_par = drm_fb_helper_set_par,
  94         .fb_fillrect = mga_fillrect,
  95         .fb_copyarea = mga_copyarea,
  96         .fb_imageblit = mga_imageblit,
  97         .fb_pan_display = drm_fb_helper_pan_display,
  98         .fb_blank = drm_fb_helper_blank,
  99         .fb_setcmap = drm_fb_helper_setcmap,
 100 };
 101
 102 static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 103                                    struct drm_mode_fb_cmd2 *mode_cmd,
 104                                    struct drm_gem_object **gobj_p)
 105 {
 106         struct drm_device *dev = afbdev->helper.dev;
 107         u32 bpp, depth;
 108         u32 size;
 109         struct drm_gem_object *gobj;
 110
 111         int ret = 0;
 112         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
 113
 114         size = mode_cmd->pitches[0] * mode_cmd->height;
 115         ret = mgag200_gem_create(dev, size, true, &gobj);
 116         if (ret)
 117                 return ret;
 118
 119         *gobj_p = gobj;
 120         return ret;
 121 }
 122
 123 static int mgag200fb_create(struct mga_fbdev *mfbdev,
 124                            struct drm_fb_helper_surface_size *sizes)
 125 {
 126         struct drm_device *dev = mfbdev->helper.dev;
 127         struct drm_mode_fb_cmd2 mode_cmd;
 128         struct mga_device *mdev = dev->dev_private;
 129         struct fb_info *info;
 130         struct drm_framebuffer *fb;
 131         struct drm_gem_object *gobj = NULL;
 132         struct device *device = &dev->pdev->dev;
 133         struct mgag200_bo *bo;
 134         int ret;
 135         void *sysram;
 136         int size;
 137
 138         mode_cmd.width = sizes->surface_width;
 139         mode_cmd.height = sizes->surface_height;
 140         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 141
 142         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 143                                                           sizes->surface_depth);
 144         size = mode_cmd.pitches[0] * mode_cmd.height;
 145
 146         ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 147         if (ret) {
 148                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 149                 return ret;
 150         }
 151         bo = gem_to_mga_bo(gobj);
 152
 153         sysram = vmalloc(size);
 154         if (!sysram)
 155                 return -ENOMEM;
 156
 157         info = framebuffer_alloc(0, device);
 158         if (info == NULL)
 159                 return -ENOMEM;
 160
 161         info->par = mfbdev;
 162
 163         ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 164         if (ret)
 165                 return ret;
 166
 167         mfbdev->sysram = sysram;
 168         mfbdev->size = size;
 169
 170         fb = &mfbdev->mfb.base;
 171
 172         /* setup helper */
 173         mfbdev->helper.fb = fb;
 174         mfbdev->helper.fbdev = info;
 175
 176         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 177         if (ret) {
 178                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 179                 ret = -ENOMEM;
 180                 goto out;
 181         }
 182
 183         strcpy(info->fix.id, "mgadrmfb");
 184
 185         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 186         info->fbops = &mgag200fb_ops;
 187
 188         /* setup aperture base/size for vesafb takeover */
 189         info->apertures = alloc_apertures(1);
 190         if (!info->apertures) {
 191                 ret = -ENOMEM;
 192                 goto out;
 193         }
 194         info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 195         info->apertures->ranges[0].size = mdev->mc.vram_size;
 196
 197         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 198         drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
 199                                sizes->fb_height);
 200
 201         info->screen_base = sysram;
 202         info->screen_size = size;
 203         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 204
 205         DRM_DEBUG_KMS("allocated %dx%d\n",
 206                       fb->width, fb->height);
 207         return 0;
 208 out:
 209         return ret;
 210 }
 211
 212 static int mga_fb_find_or_create_single(struct drm_fb_helper *helper,
 213                                            struct drm_fb_helper_surface_size
 214                                            *sizes)
 215 {
 216         struct mga_fbdev *mfbdev = (struct mga_fbdev *)helper;
 217         int new_fb = 0;
 218         int ret;
 219
 220         if (!helper->fb) {
 221                 ret = mgag200fb_create(mfbdev, sizes);
 222                 if (ret)
 223                         return ret;
 224                 new_fb = 1;
 225         }
 226         return new_fb;
 227 }
 228
 229 static int mga_fbdev_destroy(struct drm_device *dev,
 230                                 struct mga_fbdev *mfbdev)
 231 {
 232         struct fb_info *info;
 233         struct mga_framebuffer *mfb = &mfbdev->mfb;
 234
 235         if (mfbdev->helper.fbdev) {
 236                 info = mfbdev->helper.fbdev;
 237
 238                 unregister_framebuffer(info);
 239                 if (info->cmap.len)
 240                         fb_dealloc_cmap(&info->cmap);
 241                 framebuffer_release(info);
 242         }
 243
 244         if (mfb->obj) {
 245                 drm_gem_object_unreference_unlocked(mfb->obj);
 246                 mfb->obj = NULL;
 247         }
 248         drm_fb_helper_fini(&mfbdev->helper);
 249         vfree(mfbdev->sysram);
 250         drm_framebuffer_cleanup(&mfb->base);
 251
 252         return 0;
 253 }
 254
 255 static struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 256         .gamma_set = mga_crtc_fb_gamma_set,
 257         .gamma_get = mga_crtc_fb_gamma_get,
 258         .fb_probe = mga_fb_find_or_create_single,
 259 };
 260
 261 int mgag200_fbdev_init(struct mga_device *mdev)
 262 {
 263         struct mga_fbdev *mfbdev;
 264         int ret;
 265
 266         mfbdev = kzalloc(sizeof(struct mga_fbdev), GFP_KERNEL);
 267         if (!mfbdev)
 268                 return -ENOMEM;
 269
 270         mdev->mfbdev = mfbdev;
 271         mfbdev->helper.funcs = &mga_fb_helper_funcs;
 272
 273         ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 274                                  mdev->num_crtc, MGAG200FB_CONN_LIMIT);
 275         if (ret) {
 276                 kfree(mfbdev);
 277                 return ret;
 278         }
 279         drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 280         drm_fb_helper_initial_config(&mfbdev->helper, 32);
 281
 282         return 0;
 283 }
 284
 285 void mgag200_fbdev_fini(struct mga_device *mdev)
 286 {
 287         if (!mdev->mfbdev)
 288                 return;
 289
 290         mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 291         kfree(mdev->mfbdev);
 292         mdev->mfbdev = NULL;
 293 }