mirror of
https://github.com/AsahiLinux/u-boot
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a38a3c4af4
T124/210 requires some specific configuration (VPR setup) to be performed by the bootloader before the GPU can be used. For this reason, the GPU node in the device tree is disabled by default. This patch enables the node if U-boot has performed VPR configuration. Boards enabled by this patch are T124's Jetson TK1 and Venice2 and T210's P2571. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Cc: Stephen Warren <swarren@nvidia.com> Cc: Tom Warren <twarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
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* Copyright (c) 2014-2015, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Tegra vpr routines */
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/tegra.h>
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#include <asm/arch/mc.h>
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#include <fdt_support.h>
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static bool _configured;
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void config_gpu(void)
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{
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struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE;
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/* Turn VPR off */
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writel(0, &mc->mc_video_protect_size_mb);
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writel(TEGRA_MC_VIDEO_PROTECT_REG_WRITE_ACCESS_DISABLED,
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&mc->mc_video_protect_reg_ctrl);
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/* read back to ensure the write went through */
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readl(&mc->mc_video_protect_reg_ctrl);
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debug("configured VPR\n");
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_configured = true;
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}
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bool vpr_configured(void)
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{
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return _configured;
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}
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#if defined(CONFIG_OF_LIBFDT)
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int gpu_enable_node(void *blob, const char *gpupath)
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{
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int offset;
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if (vpr_configured()) {
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offset = fdt_path_offset(blob, gpupath);
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if (offset > 0) {
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fdt_status_okay(blob, offset);
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debug("enabled GPU node %s\n", gpupath);
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}
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}
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return 0;
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}
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#endif
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