1 /*
2 * Copyright (c) 2018-2024, STMicroelectronics - All Rights Reserved
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <errno.h>
8 #include <limits.h>
9
10 #include <common/bl_common.h>
11 #include <common/debug.h>
12 #include <drivers/delay_timer.h>
13 #include <drivers/st/stm32mp_reset.h>
14 #include <lib/mmio.h>
15 #include <lib/utils_def.h>
16
17 #include <platform_def.h>
18
id2reg_offset(unsigned int reset_id)19 static uint32_t id2reg_offset(unsigned int reset_id)
20 {
21 return ((reset_id & GENMASK(31, 5)) >> 5) * sizeof(uint32_t);
22 }
23
id2reg_bit_pos(unsigned int reset_id)24 static uint8_t id2reg_bit_pos(unsigned int reset_id)
25 {
26 return (uint8_t)(reset_id & GENMASK(4, 0));
27 }
28
stm32mp_reset_assert(uint32_t id,unsigned int to_us)29 int stm32mp_reset_assert(uint32_t id, unsigned int to_us)
30 {
31 uint32_t offset = id2reg_offset(id);
32 uint32_t bitmsk = BIT(id2reg_bit_pos(id));
33 uintptr_t rcc_base = stm32mp_rcc_base();
34
35 mmio_write_32(rcc_base + offset, bitmsk);
36
37 if (to_us != 0U) {
38 uint64_t timeout_ref = timeout_init_us(to_us);
39
40 while ((mmio_read_32(rcc_base + offset) & bitmsk) == 0U) {
41 if (timeout_elapsed(timeout_ref)) {
42 return -ETIMEDOUT;
43 }
44 }
45 }
46
47 return 0;
48 }
49
stm32mp_reset_deassert(uint32_t id,unsigned int to_us)50 int stm32mp_reset_deassert(uint32_t id, unsigned int to_us)
51 {
52 uint32_t offset = id2reg_offset(id) + RCC_RSTCLRR_OFFSET;
53 uint32_t bitmsk = BIT(id2reg_bit_pos(id));
54 uintptr_t rcc_base = stm32mp_rcc_base();
55
56 mmio_write_32(rcc_base + offset, bitmsk);
57
58 if (to_us != 0U) {
59 uint64_t timeout_ref = timeout_init_us(to_us);
60
61 while ((mmio_read_32(rcc_base + offset) & bitmsk) != 0U) {
62 if (timeout_elapsed(timeout_ref)) {
63 return -ETIMEDOUT;
64 }
65 }
66 }
67
68 return 0;
69 }
70
stm32mp_system_reset(void)71 void __dead2 stm32mp_system_reset(void)
72 {
73 uintptr_t rcc_base = stm32mp_rcc_base();
74
75 mmio_setbits_32(rcc_base + RCC_MP_GRSTCSETR,
76 RCC_MP_GRSTCSETR_MPSYSRST);
77
78 /* Loop in case system reset is not immediately caught */
79 while (true) {
80 wfi();
81 }
82 }
83