1 /* 2 * Copyright (c) 2014-2015, 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 #include <fdt_support.h> 25 26 static bool _configured; 27 28 void config_gpu(void) 29 { 30 struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE; 31 32 /* Turn VPR off */ 33 writel(0, &mc->mc_video_protect_size_mb); 34 writel(TEGRA_MC_VIDEO_PROTECT_REG_WRITE_ACCESS_DISABLED, 35 &mc->mc_video_protect_reg_ctrl); 36 /* read back to ensure the write went through */ 37 readl(&mc->mc_video_protect_reg_ctrl); 38 39 debug("configured VPR\n"); 40 41 _configured = true; 42 } 43 44 bool vpr_configured(void) 45 { 46 return _configured; 47 } 48 49 #if defined(CONFIG_OF_LIBFDT) 50 51 int gpu_enable_node(void *blob, const char *gpupath) 52 { 53 int offset; 54 55 if (vpr_configured()) { 56 offset = fdt_path_offset(blob, gpupath); 57 if (offset > 0) { 58 fdt_status_okay(blob, offset); 59 debug("enabled GPU node %s\n", gpupath); 60 } 61 } 62 63 return 0; 64 } 65 66 #endif 67