arch/arm/mach-tegra/gpu.c

   1 /*
   2  * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 /* Tegra vpr routines */
   8
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <asm/arch/tegra.h>
  12 #include <asm/arch/mc.h>
  13
  14 #include <fdt_support.h>
  15
  16 static bool _configured;
  17
  18 void tegra_gpu_config(void)
  19 {
  20         struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE;
  21
  22         /* Turn VPR off */
  23         writel(0, &mc->mc_video_protect_size_mb);
  24         writel(TEGRA_MC_VIDEO_PROTECT_REG_WRITE_ACCESS_DISABLED,
  25                &mc->mc_video_protect_reg_ctrl);
  26         /* read back to ensure the write went through */
  27         readl(&mc->mc_video_protect_reg_ctrl);
  28
  29         debug("configured VPR\n");
  30
  31         _configured = true;
  32 }
  33
  34 #if defined(CONFIG_OF_LIBFDT)
  35
  36 int tegra_gpu_enable_node(void *blob, const char *gpupath)
  37 {
  38         int offset;
  39
  40         if (_configured) {
  41                 offset = fdt_path_offset(blob, gpupath);
  42                 if (offset > 0) {
  43                         fdt_status_okay(blob, offset);
  44                         debug("enabled GPU node %s\n", gpupath);
  45                 }
  46         }
  47
  48         return 0;
  49 }
  50
  51 #endif