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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>
This commit is contained in:
Yann Gautier 2019-02-14 11:14:18 +01:00
parent e0a8ce5d0d
commit 6f4572bd78
1 changed files with 18 additions and 0 deletions
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18
plat/st/common/include/stm32mp_common.h
View File

@ -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 */