arch/arm/mach-tegra/tegra186/nvtboot_board.c

   1 /*
   2  * Copyright (c) 2016, NVIDIA CORPORATION.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <fdt_support.h>
   9 #include <fdtdec.h>
  10 #include <asm/arch/tegra.h>
  11
  12 extern unsigned long nvtboot_boot_x0;
  13
  14 static int set_fdt_addr(void)
  15 {
  16         int ret;
  17
  18         ret = env_set_hex("fdt_addr", nvtboot_boot_x0);
  19         if (ret) {
  20                 printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
  21                 return ret;
  22         }
  23
  24         return 0;
  25 }
  26
  27 /*
  28  * Attempt to use /chosen/nvidia,ether-mac in the nvtboot DTB to U-Boot's
  29  * ethaddr environment variable if possible.
  30  */
  31 static int set_ethaddr_from_nvtboot(void)
  32 {
  33         const void *nvtboot_blob = (void *)nvtboot_boot_x0;
  34         int ret, node, len;
  35         const u32 *prop;
  36
  37         /* Already a valid address in the environment? If so, keep it */
  38         if (getenv("ethaddr"))
  39                 return 0;
  40
  41         node = fdt_path_offset(nvtboot_blob, "/chosen");
  42         if (node < 0) {
  43                 printf("Can't find /chosen node in nvtboot DTB\n");
  44                 return node;
  45         }
  46         prop = fdt_getprop(nvtboot_blob, node, "nvidia,ether-mac", &len);
  47         if (!prop) {
  48                 printf("Can't find nvidia,ether-mac property in nvtboot DTB\n");
  49                 return -ENOENT;
  50         }
  51
  52         ret = env_set("ethaddr", (void *)prop);
  53         if (ret) {
  54                 printf("Failed to set ethaddr from nvtboot DTB: %d\n", ret);
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 int tegra_soc_board_init_late(void)
  62 {
  63         /*
  64          * Ignore errors here; the value may not be used depending on
  65          * extlinux.conf or boot script content.
  66          */
  67         set_fdt_addr();
  68         /* Ignore errors here; not all cases care about Ethernet addresses */
  69         set_ethaddr_from_nvtboot();
  70
  71         return 0;
  72 }