mirror of
https://github.com/u-boot/u-boot.git
synced 2025-04-24 14:25:56 +00:00
03de305ec4
As part of bringing the master branch back in to next, we need to allow for all of these changes to exist here. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
59 lines
No EOL
1.1 KiB
C
59 lines
No EOL
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2017-2022 Intel Corporation <www.intel.com>
|
|
*
|
|
*/
|
|
|
|
#include <init.h>
|
|
#include <div64.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/timer.h>
|
|
|
|
/*
|
|
* Timer initialization
|
|
*/
|
|
int timer_init(void)
|
|
{
|
|
#ifdef CONFIG_SPL_BUILD
|
|
int enable = 0x3; /* timer enable + output signal masked */
|
|
int loadval = ~0;
|
|
|
|
/* enable system counter */
|
|
writel(enable, SOCFPGA_GTIMER_SEC_ADDRESS);
|
|
/* enable processor pysical counter */
|
|
asm volatile("msr cntp_ctl_el0, %0" : : "r" (enable));
|
|
asm volatile("msr cntp_tval_el0, %0" : : "r" (loadval));
|
|
#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 */
|
|
;
|
|
} |