1 /* 2 * Copyright (c) 2018-2019, 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 <platform_def.h> 11 12 #include <common/bl_common.h> 13 #include <common/debug.h> 14 #include <drivers/delay_timer.h> 15 #include <drivers/st/stm32mp_reset.h> 16 #include <lib/mmio.h> 17 #include <lib/utils_def.h> 18 id2reg_offset(unsigned int reset_id)19static 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)24static 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)29int 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)50int 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