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         bool store_for_later = false;
  33         int x2, y2;
  34         unsigned long flags;
  35
  36         obj = mfbdev->mfb.obj;
  37         bo = gem_to_mga_bo(obj);
  38
  39         /*
  40          * try and reserve the BO, if we fail with busy
  41          * then the BO is being moved and we should
  42          * store up the damage until later.
  43          */
  44         ret = mgag200_bo_reserve(bo, true);
  45         if (ret) {
  46                 if (ret != -EBUSY)
  47                         return;
  48
  49                 store_for_later = true;
  50         }
  51
  52         x2 = x + width - 1;
  53         y2 = y + height - 1;
  54         spin_lock_irqsave(&mfbdev->dirty_lock, flags);
  55
  56         if (mfbdev->y1 < y)
  57                 y = mfbdev->y1;
  58         if (mfbdev->y2 > y2)
  59                 y2 = mfbdev->y2;
  60         if (mfbdev->x1 < x)
  61                 x = mfbdev->x1;
  62         if (mfbdev->x2 > x2)
  63                 x2 = mfbdev->x2;
  64
  65         if (store_for_later) {
  66                 mfbdev->x1 = x;
  67                 mfbdev->x2 = x2;
  68                 mfbdev->y1 = y;
  69                 mfbdev->y2 = y2;
  70                 spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  71                 return;
  72         }
  73
  74         mfbdev->x1 = mfbdev->y1 = INT_MAX;
  75         mfbdev->x2 = mfbdev->y2 = 0;
  76         spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  77
  78         if (!bo->kmap.virtual) {
  79                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  80                 if (ret) {
  81                         DRM_ERROR("failed to kmap fb updates\n");
  82                         mgag200_bo_unreserve(bo);
  83                         return;
  84                 }
  85                 unmap = true;
  86         }
  87         for (i = y; i <= y2; i++) {
  88                 /* assume equal stride for now */
  89                 src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
  90                 memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);
  91
  92         }
  93         if (unmap)
  94                 ttm_bo_kunmap(&bo->kmap);
  95
  96         mgag200_bo_unreserve(bo);
  97 }
  98
  99 static void mga_fillrect(struct fb_info *info,
 100                          const struct fb_fillrect *rect)
 101 {
 102         struct mga_fbdev *mfbdev = info->par;
 103         sys_fillrect(info, rect);
 104         mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
 105                          rect->height);
 106 }
 107
 108 static void mga_copyarea(struct fb_info *info,
 109                          const struct fb_copyarea *area)
 110 {
 111         struct mga_fbdev *mfbdev = info->par;
 112         sys_copyarea(info, area);
 113         mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
 114                          area->height);
 115 }
 116
 117 static void mga_imageblit(struct fb_info *info,
 118                           const struct fb_image *image)
 119 {
 120         struct mga_fbdev *mfbdev = info->par;
 121         sys_imageblit(info, image);
 122         mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
 123                          image->height);
 124 }
 125
 126
 127 static struct fb_ops mgag200fb_ops = {
 128         .owner = THIS_MODULE,
 129         .fb_check_var = drm_fb_helper_check_var,
 130         .fb_set_par = drm_fb_helper_set_par,
 131         .fb_fillrect = mga_fillrect,
 132         .fb_copyarea = mga_copyarea,
 133         .fb_imageblit = mga_imageblit,
 134         .fb_pan_display = drm_fb_helper_pan_display,
 135         .fb_blank = drm_fb_helper_blank,
 136         .fb_setcmap = drm_fb_helper_setcmap,
 137 };
 138
 139 static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 140                                    struct drm_mode_fb_cmd2 *mode_cmd,
 141                                    struct drm_gem_object **gobj_p)
 142 {
 143         struct drm_device *dev = afbdev->helper.dev;
 144         u32 size;
 145         struct drm_gem_object *gobj;
 146         int ret = 0;
 147
 148         size = mode_cmd->pitches[0] * mode_cmd->height;
 149         ret = mgag200_gem_create(dev, size, true, &gobj);
 150         if (ret)
 151                 return ret;
 152
 153         *gobj_p = gobj;
 154         return ret;
 155 }
 156
 157 static int mgag200fb_create(struct drm_fb_helper *helper,
 158                            struct drm_fb_helper_surface_size *sizes)
 159 {
 160         struct mga_fbdev *mfbdev = (struct mga_fbdev *)helper;
 161         struct drm_device *dev = mfbdev->helper.dev;
 162         struct drm_mode_fb_cmd2 mode_cmd;
 163         struct mga_device *mdev = dev->dev_private;
 164         struct fb_info *info;
 165         struct drm_framebuffer *fb;
 166         struct drm_gem_object *gobj = NULL;
 167         struct device *device = &dev->pdev->dev;
 168         struct mgag200_bo *bo;
 169         int ret;
 170         void *sysram;
 171         int size;
 172
 173         mode_cmd.width = sizes->surface_width;
 174         mode_cmd.height = sizes->surface_height;
 175         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 176
 177         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 178                                                           sizes->surface_depth);
 179         size = mode_cmd.pitches[0] * mode_cmd.height;
 180
 181         ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 182         if (ret) {
 183                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 184                 return ret;
 185         }
 186         bo = gem_to_mga_bo(gobj);
 187
 188         sysram = vmalloc(size);
 189         if (!sysram)
 190                 return -ENOMEM;
 191
 192         info = framebuffer_alloc(0, device);
 193         if (info == NULL)
 194                 return -ENOMEM;
 195
 196         info->par = mfbdev;
 197
 198         ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 199         if (ret)
 200                 return ret;
 201
 202         mfbdev->sysram = sysram;
 203         mfbdev->size = size;
 204
 205         fb = &mfbdev->mfb.base;
 206
 207         /* setup helper */
 208         mfbdev->helper.fb = fb;
 209         mfbdev->helper.fbdev = info;
 210
 211         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 212         if (ret) {
 213                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 214                 ret = -ENOMEM;
 215                 goto out;
 216         }
 217
 218         strcpy(info->fix.id, "mgadrmfb");
 219
 220         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 221         info->fbops = &mgag200fb_ops;
 222
 223         /* setup aperture base/size for vesafb takeover */
 224         info->apertures = alloc_apertures(1);
 225         if (!info->apertures) {
 226                 ret = -ENOMEM;
 227                 goto out;
 228         }
 229         info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 230         info->apertures->ranges[0].size = mdev->mc.vram_size;
 231
 232         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 233         drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
 234                                sizes->fb_height);
 235
 236         info->screen_base = sysram;
 237         info->screen_size = size;
 238         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 239
 240         DRM_DEBUG_KMS("allocated %dx%d\n",
 241                       fb->width, fb->height);
 242         return 0;
 243 out:
 244         return ret;
 245 }
 246
 247 static int mga_fbdev_destroy(struct drm_device *dev,
 248                                 struct mga_fbdev *mfbdev)
 249 {
 250         struct fb_info *info;
 251         struct mga_framebuffer *mfb = &mfbdev->mfb;
 252
 253         if (mfbdev->helper.fbdev) {
 254                 info = mfbdev->helper.fbdev;
 255
 256                 unregister_framebuffer(info);
 257                 if (info->cmap.len)
 258                         fb_dealloc_cmap(&info->cmap);
 259                 framebuffer_release(info);
 260         }
 261
 262         if (mfb->obj) {
 263                 drm_gem_object_unreference_unlocked(mfb->obj);
 264                 mfb->obj = NULL;
 265         }
 266         drm_fb_helper_fini(&mfbdev->helper);
 267         vfree(mfbdev->sysram);
 268         drm_framebuffer_unregister_private(&mfb->base);
 269         drm_framebuffer_cleanup(&mfb->base);
 270
 271         return 0;
 272 }
 273
 274 static struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 275         .gamma_set = mga_crtc_fb_gamma_set,
 276         .gamma_get = mga_crtc_fb_gamma_get,
 277         .fb_probe = mgag200fb_create,
 278 };
 279
 280 int mgag200_fbdev_init(struct mga_device *mdev)
 281 {
 282         struct mga_fbdev *mfbdev;
 283         int ret;
 284
 285         mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
 286         if (!mfbdev)
 287                 return -ENOMEM;
 288
 289         mdev->mfbdev = mfbdev;
 290         mfbdev->helper.funcs = &mga_fb_helper_funcs;
 291         spin_lock_init(&mfbdev->dirty_lock);
 292
 293         ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 294                                  mdev->num_crtc, MGAG200FB_CONN_LIMIT);
 295         if (ret)
 296                 return ret;
 297
 298         drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 299
 300         /* disable all the possible outputs/crtcs before entering KMS mode */
 301         drm_helper_disable_unused_functions(mdev->dev);
 302
 303         drm_fb_helper_initial_config(&mfbdev->helper, 32);
 304
 305         return 0;
 306 }
 307
 308 void mgag200_fbdev_fini(struct mga_device *mdev)
 309 {
 310         if (!mdev->mfbdev)
 311                 return;
 312
 313         mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 314 }