arch/arm/mach-tegra/vpr.c

   1 /*
   2  * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 /* Tegra vpr routines */
  18
  19 #include <common.h>
  20 #include <asm/io.h>
  21 #include <asm/arch/tegra.h>
  22 #include <asm/arch/mc.h>
  23
  24 /* Configures VPR.  Right now, all we do is turn it off. */
  25 void config_vpr(void)
  26 {
  27         struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE;
  28
  29         /* Turn VPR off */
  30         writel(0, &mc->mc_video_protect_size_mb);
  31         writel(TEGRA_MC_VIDEO_PROTECT_REG_WRITE_ACCESS_DISABLED,
  32                &mc->mc_video_protect_reg_ctrl);
  33         /* read back to ensure the write went through */
  34         readl(&mc->mc_video_protect_reg_ctrl);
  35 }