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 = -EBUSY;
  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         if (drm_can_sleep())
  45                 ret = mgag200_bo_reserve(bo, true);
  46         if (ret) {
  47                 if (ret != -EBUSY)
  48                         return;
  49
  50                 store_for_later = true;
  51         }
  52
  53         x2 = x + width - 1;
  54         y2 = y + height - 1;
  55         spin_lock_irqsave(&mfbdev->dirty_lock, flags);
  56
  57         if (mfbdev->y1 < y)
  58                 y = mfbdev->y1;
  59         if (mfbdev->y2 > y2)
  60                 y2 = mfbdev->y2;
  61         if (mfbdev->x1 < x)
  62                 x = mfbdev->x1;
  63         if (mfbdev->x2 > x2)
  64                 x2 = mfbdev->x2;
  65
  66         if (store_for_later) {
  67                 mfbdev->x1 = x;
  68                 mfbdev->x2 = x2;
  69                 mfbdev->y1 = y;
  70                 mfbdev->y2 = y2;
  71                 spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  72                 return;
  73         }
  74
  75         mfbdev->x1 = mfbdev->y1 = INT_MAX;
  76         mfbdev->x2 = mfbdev->y2 = 0;
  77         spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  78
  79         if (!bo->kmap.virtual) {
  80                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  81                 if (ret) {
  82                         DRM_ERROR("failed to kmap fb updates\n");
  83                         mgag200_bo_unreserve(bo);
  84                         return;
  85                 }
  86                 unmap = true;
  87         }
  88         for (i = y; i <= y2; i++) {
  89                 /* assume equal stride for now */
  90                 src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
  91                 memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);
  92
  93         }
  94         if (unmap)
  95                 ttm_bo_kunmap(&bo->kmap);
  96
  97         mgag200_bo_unreserve(bo);
  98 }
  99
 100 static void mga_fillrect(struct fb_info *info,
 101                          const struct fb_fillrect *rect)
 102 {
 103         struct mga_fbdev *mfbdev = info->par;
 104         drm_fb_helper_sys_fillrect(info, rect);
 105         mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
 106                          rect->height);
 107 }
 108
 109 static void mga_copyarea(struct fb_info *info,
 110                          const struct fb_copyarea *area)
 111 {
 112         struct mga_fbdev *mfbdev = info->par;
 113         drm_fb_helper_sys_copyarea(info, area);
 114         mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
 115                          area->height);
 116 }
 117
 118 static void mga_imageblit(struct fb_info *info,
 119                           const struct fb_image *image)
 120 {
 121         struct mga_fbdev *mfbdev = info->par;
 122         drm_fb_helper_sys_imageblit(info, image);
 123         mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
 124                          image->height);
 125 }
 126
 127
 128 static struct fb_ops mgag200fb_ops = {
 129         .owner = THIS_MODULE,
 130         .fb_check_var = drm_fb_helper_check_var,
 131         .fb_set_par = drm_fb_helper_set_par,
 132         .fb_fillrect = mga_fillrect,
 133         .fb_copyarea = mga_copyarea,
 134         .fb_imageblit = mga_imageblit,
 135         .fb_pan_display = drm_fb_helper_pan_display,
 136         .fb_blank = drm_fb_helper_blank,
 137         .fb_setcmap = drm_fb_helper_setcmap,
 138 };
 139
 140 static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 141                                    struct drm_mode_fb_cmd2 *mode_cmd,
 142                                    struct drm_gem_object **gobj_p)
 143 {
 144         struct drm_device *dev = afbdev->helper.dev;
 145         u32 size;
 146         struct drm_gem_object *gobj;
 147         int ret = 0;
 148
 149         size = mode_cmd->pitches[0] * mode_cmd->height;
 150         ret = mgag200_gem_create(dev, size, true, &gobj);
 151         if (ret)
 152                 return ret;
 153
 154         *gobj_p = gobj;
 155         return ret;
 156 }
 157
 158 static int mgag200fb_create(struct drm_fb_helper *helper,
 159                            struct drm_fb_helper_surface_size *sizes)
 160 {
 161         struct mga_fbdev *mfbdev =
 162                 container_of(helper, struct mga_fbdev, helper);
 163         struct drm_device *dev = mfbdev->helper.dev;
 164         struct drm_mode_fb_cmd2 mode_cmd;
 165         struct mga_device *mdev = dev->dev_private;
 166         struct fb_info *info;
 167         struct drm_framebuffer *fb;
 168         struct drm_gem_object *gobj = NULL;
 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
 187         sysram = vmalloc(size);
 188         if (!sysram)
 189                 return -ENOMEM;
 190
 191         info = drm_fb_helper_alloc_fbi(helper);
 192         if (IS_ERR(info))
 193                 return PTR_ERR(info);
 194
 195         info->par = mfbdev;
 196
 197         ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 198         if (ret)
 199                 return ret;
 200
 201         mfbdev->sysram = sysram;
 202         mfbdev->size = size;
 203
 204         fb = &mfbdev->mfb.base;
 205
 206         /* setup helper */
 207         mfbdev->helper.fb = fb;
 208
 209         strcpy(info->fix.id, "mgadrmfb");
 210
 211         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 212         info->fbops = &mgag200fb_ops;
 213
 214         /* setup aperture base/size for vesafb takeover */
 215         info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 216         info->apertures->ranges[0].size = mdev->mc.vram_size;
 217
 218         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 219         drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
 220                                sizes->fb_height);
 221
 222         info->screen_base = sysram;
 223         info->screen_size = size;
 224         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 225
 226         DRM_DEBUG_KMS("allocated %dx%d\n",
 227                       fb->width, fb->height);
 228         return 0;
 229 }
 230
 231 static int mga_fbdev_destroy(struct drm_device *dev,
 232                                 struct mga_fbdev *mfbdev)
 233 {
 234         struct mga_framebuffer *mfb = &mfbdev->mfb;
 235
 236         drm_fb_helper_unregister_fbi(&mfbdev->helper);
 237         drm_fb_helper_release_fbi(&mfbdev->helper);
 238
 239         if (mfb->obj) {
 240                 drm_gem_object_unreference_unlocked(mfb->obj);
 241                 mfb->obj = NULL;
 242         }
 243         drm_fb_helper_fini(&mfbdev->helper);
 244         vfree(mfbdev->sysram);
 245         drm_framebuffer_unregister_private(&mfb->base);
 246         drm_framebuffer_cleanup(&mfb->base);
 247
 248         return 0;
 249 }
 250
 251 static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 252         .gamma_set = mga_crtc_fb_gamma_set,
 253         .gamma_get = mga_crtc_fb_gamma_get,
 254         .fb_probe = mgag200fb_create,
 255 };
 256
 257 int mgag200_fbdev_init(struct mga_device *mdev)
 258 {
 259         struct mga_fbdev *mfbdev;
 260         int ret;
 261         int bpp_sel = 32;
 262
 263         /* prefer 16bpp on low end gpus with limited VRAM */
 264         if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 265                 bpp_sel = 16;
 266
 267         mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
 268         if (!mfbdev)
 269                 return -ENOMEM;
 270
 271         mdev->mfbdev = mfbdev;
 272         spin_lock_init(&mfbdev->dirty_lock);
 273
 274         drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);
 275
 276         ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 277                                  mdev->num_crtc, MGAG200FB_CONN_LIMIT);
 278         if (ret)
 279                 return ret;
 280
 281         ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 282         if (ret)
 283                 goto fini;
 284
 285         /* disable all the possible outputs/crtcs before entering KMS mode */
 286         drm_helper_disable_unused_functions(mdev->dev);
 287
 288         ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
 289         if (ret)
 290                 goto fini;
 291
 292         return 0;
 293
 294 fini:
 295         drm_fb_helper_fini(&mfbdev->helper);
 296         return ret;
 297 }
 298
 299 void mgag200_fbdev_fini(struct mga_device *mdev)
 300 {
 301         if (!mdev->mfbdev)
 302                 return;
 303
 304         mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 305 }