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arch: arm: socfpga: timer_s10: Override udelay for secure section

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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>
This commit is contained in:
Dinesh Maniyam 2022-06-01 15:54:59 +08:00 committed by Tien Fong Chee
parent 163863d572
commit 373c1428a0
1 changed files with 33 additions and 1 deletions
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34
arch/arm/mach-socfpga/timer_s10.c
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@ -1,11 +1,12 @@
// SPDX-License-Identifier: GPL-2.0 // 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 <common.h>
#include <init.h> #include <init.h>
#include <div64.h>
#include <asm/io.h> #include <asm/io.h>
#include <asm/arch/timer.h> #include <asm/arch/timer.h>
@ -26,3 +27,34 @@ int timer_init(void)
#endif #endif
return 0; 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 */
;
}