drivers/gpu/drm/gma500/gtt.h

   1 /**************************************************************************
   2  * Copyright (c) 2007-2008, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  **************************************************************************/
  19
  20 #ifndef _PSB_GTT_H_
  21 #define _PSB_GTT_H_
  22
  23 #include <drm/drmP.h>
  24
  25 /* This wants cleaning up with respect to the psb_dev and un-needed stuff */
  26 struct psb_gtt {
  27         uint32_t gatt_start;
  28         uint32_t mmu_gatt_start;
  29         uint32_t gtt_start;
  30         uint32_t gtt_phys_start;
  31         unsigned gtt_pages;
  32         unsigned gatt_pages;
  33         unsigned long stolen_size;
  34         unsigned long vram_stolen_size;
  35         struct rw_semaphore sem;
  36 };
  37
  38 /* Exported functions */
  39 extern int psb_gtt_init(struct drm_device *dev, int resume);
  40 extern void psb_gtt_takedown(struct drm_device *dev);
  41
  42 /* Each gtt_range describes an allocation in the GTT area */
  43 struct gtt_range {
  44         struct resource resource;       /* Resource for our allocation */
  45         u32 offset;                     /* GTT offset of our object */
  46         struct drm_gem_object gem;      /* GEM high level stuff */
  47         int in_gart;                    /* Currently in the GART (ref ct) */
  48         bool stolen;                    /* Backed from stolen RAM */
  49         bool mmapping;                  /* Is mmappable */
  50         struct page **pages;            /* Backing pages if present */
  51         int npage;                      /* Number of backing pages */
  52         int roll;                       /* Roll applied to the GTT entries */
  53 };
  54
  55 extern struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
  56                                                 const char *name, int backed);
  57 extern void psb_gtt_kref_put(struct gtt_range *gt);
  58 extern void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt);
  59 extern int psb_gtt_pin(struct gtt_range *gt);
  60 extern void psb_gtt_unpin(struct gtt_range *gt);
  61 extern void psb_gtt_roll(struct drm_device *dev,
  62                                         struct gtt_range *gt, int roll);
  63
  64 #endif