arch/arm/mach-tegra/gpu.c

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