Marek Behún | 19d8578 | 2021-01-05 14:01:05 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2020 Marek Behun, CZ.NIC |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | * https://spdx.org/licenses |
| 6 | */ |
| 7 | |
| 8 | #include <stdbool.h> |
| 9 | |
| 10 | #include <common/debug.h> |
| 11 | #include <drivers/delay_timer.h> |
| 12 | #include <lib/mmio.h> |
| 13 | |
| 14 | #include <mvebu_def.h> |
| 15 | |
| 16 | /* Cortex-M3 Secure Processor Mailbox Registers */ |
| 17 | #define MVEBU_RWTM_PARAM0_REG (MVEBU_RWTM_REG_BASE) |
| 18 | #define MVEBU_RWTM_CMD_REG (MVEBU_RWTM_REG_BASE + 0x40) |
| 19 | #define MVEBU_RWTM_HOST_INT_RESET_REG (MVEBU_RWTM_REG_BASE + 0xC8) |
| 20 | #define MVEBU_RWTM_HOST_INT_MASK_REG (MVEBU_RWTM_REG_BASE + 0xCC) |
| 21 | #define MVEBU_RWTM_HOST_INT_SP_COMPLETE BIT(0) |
| 22 | |
| 23 | #define MVEBU_RWTM_REBOOT_CMD 0x0009 |
| 24 | #define MVEBU_RWTM_REBOOT_MAGIC 0xDEADBEEF |
| 25 | |
| 26 | static inline bool rwtm_completed(void) |
| 27 | { |
| 28 | return (mmio_read_32(MVEBU_RWTM_HOST_INT_RESET_REG) & |
| 29 | MVEBU_RWTM_HOST_INT_SP_COMPLETE) != 0; |
| 30 | } |
| 31 | |
| 32 | static bool rwtm_wait(int ms) |
| 33 | { |
| 34 | while (ms && !rwtm_completed()) { |
| 35 | mdelay(1); |
| 36 | --ms; |
| 37 | } |
| 38 | |
| 39 | return rwtm_completed(); |
| 40 | } |
| 41 | |
| 42 | void cm3_system_reset(void) |
| 43 | { |
| 44 | int tries = 5; |
| 45 | |
| 46 | for (; tries > 0; --tries) { |
| 47 | mmio_clrbits_32(MVEBU_RWTM_HOST_INT_RESET_REG, |
| 48 | MVEBU_RWTM_HOST_INT_SP_COMPLETE); |
| 49 | |
| 50 | mmio_write_32(MVEBU_RWTM_PARAM0_REG, MVEBU_RWTM_REBOOT_MAGIC); |
| 51 | mmio_write_32(MVEBU_RWTM_CMD_REG, MVEBU_RWTM_REBOOT_CMD); |
| 52 | |
| 53 | if (rwtm_wait(10)) { |
| 54 | break; |
| 55 | } |
| 56 | |
| 57 | mdelay(100); |
| 58 | } |
| 59 | |
| 60 | /* If we reach here, the command is not implemented. */ |
Pali Rohár | 370b765 | 2022-03-12 12:45:56 +0100 | [diff] [blame] | 61 | WARN("System reset command not implemented in WTMI firmware!\n"); |
Marek Behún | 19d8578 | 2021-01-05 14:01:05 +0100 | [diff] [blame] | 62 | } |