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| author | Dinesh Maniyam <dinesh.maniyam@intel.com> | 2022-06-01 15:54:59 +0800 |
|---|---|---|
| committer | Tien Fong Chee <tien.fong.chee@intel.com> | 2022-06-17 16:26:52 +0800 |
| commit | 373c1428a0374c29f19cca76f12c0e93378a634a (patch) | |
| tree | 32f342d05c464ff893d5d60a27ec9cf4aa61da31 | |
| parent | 163863d572a7bc52b58743b3de4aafbc24dd12c8 (diff) | |
| download | u-boot-373c1428a0374c29f19cca76f12c0e93378a634a.zip u-boot-373c1428a0374c29f19cca76f12c0e93378a634a.tar.gz u-boot-373c1428a0374c29f19cca76f12c0e93378a634a.tar.bz2 | |
arch: arm: socfpga: timer_s10: Override udelay for secure section
Override __udelay() as 'always inlined' function so that PSCI code
run in '__secure' section can call this delay function as well.
Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Dinesh Maniyam <dinesh.maniyam@intel.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@intel.com>
| -rw-r--r-- | arch/arm/mach-socfpga/timer_s10.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/arch/arm/mach-socfpga/timer_s10.c b/arch/arm/mach-socfpga/timer_s10.c index 7d5598e..84b13ce 100644 --- a/arch/arm/mach-socfpga/timer_s10.c +++ b/arch/arm/mach-socfpga/timer_s10.c @@ -1,11 +1,12 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (C) 2017-2018 Intel Corporation <www.intel.com> + * Copyright (C) 2017-2022 Intel Corporation <www.intel.com> * */ #include <common.h> #include <init.h> +#include <div64.h> #include <asm/io.h> #include <asm/arch/timer.h> @@ -26,3 +27,34 @@ int timer_init(void) #endif return 0; } + +__always_inline u64 __get_time_stamp(void) +{ + u64 cntpct; + + isb(); + asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct)); + + return cntpct; +} + +__always_inline uint64_t __usec_to_tick(unsigned long usec) +{ + u64 tick = usec; + u64 cntfrq; + + asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq)); + tick *= cntfrq; + do_div(tick, 1000000); + + return tick; +} + +__always_inline void __udelay(unsigned long usec) +{ + /* get current timestamp */ + u64 tmp = __get_time_stamp() + __usec_to_tick(usec); + + while (__get_time_stamp() < tmp + 1) /* loop till event */ + ; +}
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