| Peng Fan | 6f6058b | 2016-01-28 16:55:04 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 Freescale Semiconductor, Inc. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0+ |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <command.h> |
| 9 | |
| 10 | /* Allow for arch specific config before we boot */ |
| 11 | static int __arch_auxiliary_core_up(u32 core_id, u32 boot_private_data) |
| 12 | { |
| 13 | /* please define platform specific arch_auxiliary_core_up() */ |
| 14 | return CMD_RET_FAILURE; |
| 15 | } |
| 16 | |
| 17 | int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data) |
| 18 | __attribute__((weak, alias("__arch_auxiliary_core_up"))); |
| 19 | |
| 20 | /* Allow for arch specific config before we boot */ |
| 21 | static int __arch_auxiliary_core_check_up(u32 core_id) |
| 22 | { |
| 23 | /* please define platform specific arch_auxiliary_core_check_up() */ |
| 24 | return 0; |
| 25 | } |
| 26 | |
| 27 | int arch_auxiliary_core_check_up(u32 core_id) |
| 28 | __attribute__((weak, alias("__arch_auxiliary_core_check_up"))); |
| 29 | |
| 30 | /* |
| 31 | * To i.MX6SX and i.MX7D, the image supported by bootaux needs |
| 32 | * the reset vector at the head for the image, with SP and PC |
| 33 | * as the first two words. |
| 34 | * |
| 35 | * Per the cortex-M reference manual, the reset vector of M4 needs |
| 36 | * to exist at 0x0 (TCMUL). The PC and SP are the first two addresses |
| 37 | * of that vector. So to boot M4, the A core must build the M4's reset |
| 38 | * vector with getting the PC and SP from image and filling them to |
| 39 | * TCMUL. When M4 is kicked, it will load the PC and SP by itself. |
| 40 | * The TCMUL is mapped to (M4_BOOTROM_BASE_ADDR) at A core side for |
| 41 | * accessing the M4 TCMUL. |
| 42 | */ |
| 43 | int do_bootaux(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
| 44 | { |
| 45 | ulong addr; |
| 46 | int ret, up; |
| 47 | |
| 48 | if (argc < 2) |
| 49 | return CMD_RET_USAGE; |
| 50 | |
| 51 | up = arch_auxiliary_core_check_up(0); |
| 52 | if (up) { |
| 53 | printf("## Auxiliary core is already up\n"); |
| 54 | return CMD_RET_SUCCESS; |
| 55 | } |
| 56 | |
| 57 | addr = simple_strtoul(argv[1], NULL, 16); |
| 58 | |
| 59 | printf("## Starting auxiliary core at 0x%08lX ...\n", addr); |
| 60 | |
| 61 | ret = arch_auxiliary_core_up(0, addr); |
| 62 | if (ret) |
| 63 | return CMD_RET_FAILURE; |
| 64 | |
| 65 | return CMD_RET_SUCCESS; |
| 66 | } |
| 67 | |
| 68 | U_BOOT_CMD( |
| 69 | bootaux, CONFIG_SYS_MAXARGS, 1, do_bootaux, |
| 70 | "Start auxiliary core", |
| 71 | "" |
| 72 | ); |