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_util.h>
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_crtc_helper.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.format->cpp[0];
  29         int ret = -EBUSY;
  30         bool unmap = false;
  31         bool store_for_later = false;
  32         int x2, y2;
  33         unsigned long flags;
  34
  35         obj = mfbdev->mfb.obj;
  36         bo = gem_to_mga_bo(obj);
  37
  38         /*
  39          * try and reserve the BO, if we fail with busy
  40          * then the BO is being moved and we should
  41          * store up the damage until later.
  42          */
  43         if (drm_can_sleep())
  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         drm_fb_helper_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         drm_fb_helper_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         drm_fb_helper_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                                    const 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 =
 161                 container_of(helper, struct mga_fbdev, helper);
 162         struct drm_device *dev = mfbdev->helper.dev;
 163         struct drm_mode_fb_cmd2 mode_cmd;
 164         struct mga_device *mdev = dev->dev_private;
 165         struct fb_info *info;
 166         struct drm_framebuffer *fb;
 167         struct drm_gem_object *gobj = NULL;
 168         int ret;
 169         void *sysram;
 170         int size;
 171
 172         mode_cmd.width = sizes->surface_width;
 173         mode_cmd.height = sizes->surface_height;
 174         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 175
 176         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 177                                                           sizes->surface_depth);
 178         size = mode_cmd.pitches[0] * mode_cmd.height;
 179
 180         ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 181         if (ret) {
 182                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 183                 return ret;
 184         }
 185
 186         sysram = vmalloc(size);
 187         if (!sysram) {
 188                 ret = -ENOMEM;
 189                 goto err_sysram;
 190         }
 191
 192         info = drm_fb_helper_alloc_fbi(helper);
 193         if (IS_ERR(info)) {
 194                 ret = PTR_ERR(info);
 195                 goto err_alloc_fbi;
 196         }
 197
 198         ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 199         if (ret)
 200                 goto err_alloc_fbi;
 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
 210         info->fbops = &mgag200fb_ops;
 211
 212         /* setup aperture base/size for vesafb takeover */
 213         info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 214         info->apertures->ranges[0].size = mdev->mc.vram_size;
 215
 216         drm_fb_helper_fill_info(info, &mfbdev->helper, sizes);
 217
 218         info->screen_base = sysram;
 219         info->screen_size = size;
 220         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 221
 222         DRM_DEBUG_KMS("allocated %dx%d\n",
 223                       fb->width, fb->height);
 224
 225         return 0;
 226
 227 err_alloc_fbi:
 228         vfree(sysram);
 229 err_sysram:
 230         drm_gem_object_put_unlocked(gobj);
 231
 232         return ret;
 233 }
 234
 235 static int mga_fbdev_destroy(struct drm_device *dev,
 236                                 struct mga_fbdev *mfbdev)
 237 {
 238         struct mga_framebuffer *mfb = &mfbdev->mfb;
 239
 240         drm_fb_helper_unregister_fbi(&mfbdev->helper);
 241
 242         if (mfb->obj) {
 243                 drm_gem_object_put_unlocked(mfb->obj);
 244                 mfb->obj = NULL;
 245         }
 246         drm_fb_helper_fini(&mfbdev->helper);
 247         vfree(mfbdev->sysram);
 248         drm_framebuffer_unregister_private(&mfb->base);
 249         drm_framebuffer_cleanup(&mfb->base);
 250
 251         return 0;
 252 }
 253
 254 static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 255         .fb_probe = mgag200fb_create,
 256 };
 257
 258 int mgag200_fbdev_init(struct mga_device *mdev)
 259 {
 260         struct mga_fbdev *mfbdev;
 261         int ret;
 262         int bpp_sel = 32;
 263
 264         /* prefer 16bpp on low end gpus with limited VRAM */
 265         if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 266                 bpp_sel = 16;
 267
 268         mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
 269         if (!mfbdev)
 270                 return -ENOMEM;
 271
 272         mdev->mfbdev = mfbdev;
 273         spin_lock_init(&mfbdev->dirty_lock);
 274
 275         drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);
 276
 277         ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 278                                  MGAG200FB_CONN_LIMIT);
 279         if (ret)
 280                 goto err_fb_helper;
 281
 282         ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 283         if (ret)
 284                 goto err_fb_setup;
 285
 286         /* disable all the possible outputs/crtcs before entering KMS mode */
 287         drm_helper_disable_unused_functions(mdev->dev);
 288
 289         ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
 290         if (ret)
 291                 goto err_fb_setup;
 292
 293         return 0;
 294
 295 err_fb_setup:
 296         drm_fb_helper_fini(&mfbdev->helper);
 297 err_fb_helper:
 298         mdev->mfbdev = NULL;
 299
 300         return ret;
 301 }
 302
 303 void mgag200_fbdev_fini(struct mga_device *mdev)
 304 {
 305         if (!mdev->mfbdev)
 306                 return;
 307
 308         mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 309 }