diff options
| author | Yann Gautier <yann.gautier@st.com> | 2019-02-14 11:14:18 +0100 |
|---|---|---|
| committer | Yann Gautier <yann.gautier@st.com> | 2019-02-14 11:20:23 +0100 |
| commit | 6f4572bd7857122e65bd6d9bce9e39fc572d7c56 (patch) | |
| tree | eb76813de48ffe83f96674f7aec53ffbb3987935 /plat/st | |
| parent | e0a8ce5d0d1395da3b442c7c019ba62d1361e92b (diff) | |
Introduce timeout_init_us/timeout_elapsed() delay tracking with CNTPCT.
timeout_init_us(some_timeout_us); returns a reference to detect
timeout for the provided microsecond delay value from current time.
timeout_elapsed(reference) return true/false whether the reference
timeout is elapsed.
This change is inspired by the OP-TEE OS timeout resources [1].
[1] https://github.com/OP-TEE/optee_os/blob/3.4.0/core/arch/arm/include/kernel/delay.h#L45
Change-Id: Id81ff48aa49693f555dc621064878417101d5587
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Diffstat (limited to 'plat/st')
| -rw-r--r-- | plat/st/common/include/stm32mp_common.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/plat/st/common/include/stm32mp_common.h b/plat/st/common/include/stm32mp_common.h index 269d8acb..5f54b103 100644 --- a/plat/st/common/include/stm32mp_common.h +++ b/plat/st/common/include/stm32mp_common.h @@ -1,5 +1,6 @@ /* * Copyright (C) 2018-2019, STMicroelectronics - All Rights Reserved + * Copyright (c) 2018-2019, Linaro Limited * * SPDX-License-Identifier: BSD-3-Clause */ @@ -9,6 +10,8 @@ #include <stdbool.h> +#include <arch_helpers.h> + /* Functions to save and get boot context address given by ROM code */ void stm32mp_save_boot_ctx_address(uintptr_t address); uintptr_t stm32mp_get_boot_ctx_address(void); @@ -42,4 +45,19 @@ unsigned long stm32mp_clk_get_rate(unsigned long id); /* Initialise the IO layer and register platform IO devices */ void stm32mp_io_setup(void); +static inline uint64_t arm_cnt_us2cnt(uint32_t us) +{ + return ((uint64_t)us * (uint64_t)read_cntfrq()) / 1000000ULL; +} + +static inline uint64_t timeout_init_us(uint32_t us) +{ + return read_cntpct_el0() + arm_cnt_us2cnt(us); +} + +static inline bool timeout_elapsed(uint64_t expire) +{ + return read_cntpct_el0() > expire; +} + #endif /* STM32MP_COMMON_H */ |