| Patrick Delaunay | 9827611 | 2020-03-18 09:22:50 +0100 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause |
| 2 | /* |
| 3 | * Copyright (C) 2019, STMicroelectronics - All Rights Reserved |
| 4 | */ |
| 5 | |
| 6 | #include <common.h> |
| 7 | #include <asm/sections.h> |
| 8 | #include <asm/system.h> |
| 9 | |
| 10 | /* |
| 11 | * Force data-section, as .bss will not be valid |
| 12 | * when save_boot_params is invoked. |
| 13 | */ |
| 14 | static unsigned long nt_fw_dtb __section(".data"); |
| 15 | |
| 16 | /* |
| 17 | * Save the FDT address provided by TF-A in r2 at boot time |
| 18 | * This function is called from start.S |
| 19 | */ |
| 20 | void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2, |
| 21 | unsigned long r3) |
| 22 | { |
| 23 | nt_fw_dtb = r2; |
| 24 | |
| 25 | save_boot_params_ret(); |
| 26 | } |
| 27 | |
| 28 | /* |
| 29 | * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG = |
| 30 | * Non Trusted Firmware configuration file) when the pointer is valid |
| 31 | */ |
| 32 | void *board_fdt_blob_setup(void) |
| 33 | { |
| 34 | debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb); |
| 35 | |
| 36 | /* use external device tree only if address is valid */ |
| 37 | if (nt_fw_dtb >= STM32_DDR_BASE) { |
| 38 | if (fdt_magic(nt_fw_dtb) == FDT_MAGIC) |
| 39 | return (void *)nt_fw_dtb; |
| 40 | debug("%s: DTB not found.\n", __func__); |
| 41 | } |
| 42 | debug("%s: fall back to builtin DTB, %p\n", __func__, &_end); |
| 43 | |
| 44 | return (void *)&_end; |
| 45 | } |