LXR uboot/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
  16static bool _configured;
  17
  18void 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
  36int tegra_gpu_enable_node(void *blob, const char *compat)
  37{
  38        int offset;
  39
  40        if (!_configured)
  41                return 0;
  42
  43        offset = fdt_node_offset_by_compatible(blob, -1, compat);
  44        while (offset != -FDT_ERR_NOTFOUND) {
  45                fdt_status_okay(blob, offset);
  46                offset = fdt_node_offset_by_compatible(blob, offset, compat);
  47        }
  48
  49        return 0;
  50}
  51
  52#endif
  53