mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-17 16:53:06 +00:00
cf033e04da
-----BEGIN PGP SIGNATURE----- iQHDBAABCgAtFiEEiZClFGvhzbUNsmAvKMTY0yrV63cFAlvRk0gPHHNiYWJpY0Bk ZW54LmRlAAoJECjE2NMq1et3IuAL/0jfCqEIzKbPXIz81zJ+43ZNPsyu4LluUFsP 2s5+yKN4zPnxDaHmVyxKynREqCNCcbfz7biStEPRzIjQYPBWUWrqz1yceqvOTqWQ eh51ItNeow28IlnVEr40e5cNL28KPsAdO8Tx6yNiXdPndPOgm3DuFlT+Xbnv2/+P X9GYBoCD7EQ3aUJBDUKcN/AFSAl8YCQ43FKhowM18/ExeURiKk8YDRXVFgTDDd4J HIlzUbyeIG24xfmxc0MsUMEufMjqQE7k/tMfFvQJiwLBLkzuO+1WmbPlWd7XHqco t68mheBcm8m2G/CZJoxCy8ymUi5PKDJBhw3qQz646h+JiXP1lg7Yw8hf4nREV56k v/bMiDU1exIflI9Qf8CibxRAYv3bjKJD6p/uua2CIvsLO4emLPbi7DHFBdaQq+WB r32O0Xc6LiRBIhr/qeL/5HmxFT2o4lo+O9ybo10uhK8RA1LTPlQ0UNMwmSPLl4zR 7e5YwnRCcHV492+/Fn31LWXUUVVxVw== =kkpS -----END PGP SIGNATURE----- Merge tag 'u-boot-imx-20181025' of git://git.denx.de/u-boot-imx Merged imx8 architecture, fix build for imx8 + warnings
122 lines
2.4 KiB
C
122 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2015 Freescale Semiconductor, Inc.
|
|
*
|
|
* The file use ls102xa/timer.c as a reference.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <div64.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <asm/arch/sys_proto.h>
|
|
#include <asm/mach-imx/syscounter.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/*
|
|
* This function is intended for SHORT delays only.
|
|
* It will overflow at around 10 seconds @ 400MHz,
|
|
* or 20 seconds @ 200MHz.
|
|
*/
|
|
unsigned long usec2ticks(unsigned long usec)
|
|
{
|
|
ulong ticks;
|
|
|
|
if (usec < 1000)
|
|
ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
|
|
else
|
|
ticks = ((usec / 10) * (get_tbclk() / 100000));
|
|
|
|
return ticks;
|
|
}
|
|
|
|
static inline unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
unsigned long freq;
|
|
|
|
asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
|
|
|
|
tick *= CONFIG_SYS_HZ;
|
|
do_div(tick, freq);
|
|
|
|
return tick;
|
|
}
|
|
|
|
static inline unsigned long long us_to_tick(unsigned long long usec)
|
|
{
|
|
unsigned long freq;
|
|
|
|
asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
|
|
|
|
usec = usec * freq + 999999;
|
|
do_div(usec, 1000000);
|
|
|
|
return usec;
|
|
}
|
|
|
|
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
|
|
int timer_init(void)
|
|
{
|
|
struct sctr_regs *sctr = (struct sctr_regs *)SCTR_BASE_ADDR;
|
|
unsigned long val, freq;
|
|
|
|
freq = CONFIG_SC_TIMER_CLK;
|
|
asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
|
|
|
|
writel(freq, &sctr->cntfid0);
|
|
|
|
/* Enable system counter */
|
|
val = readl(&sctr->cntcr);
|
|
val &= ~(SC_CNTCR_FREQ0 | SC_CNTCR_FREQ1);
|
|
val |= SC_CNTCR_FREQ0 | SC_CNTCR_ENABLE | SC_CNTCR_HDBG;
|
|
writel(val, &sctr->cntcr);
|
|
|
|
gd->arch.tbl = 0;
|
|
gd->arch.tbu = 0;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
unsigned long long now;
|
|
|
|
asm volatile("mrrc p15, 0, %Q0, %R0, c14" : "=r" (now));
|
|
|
|
gd->arch.tbl = (unsigned long)(now & 0xffffffff);
|
|
gd->arch.tbu = (unsigned long)(now >> 32);
|
|
|
|
return now;
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return tick_to_time(get_ticks()) - base;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long long tmp;
|
|
ulong tmo;
|
|
|
|
tmo = us_to_tick(usec);
|
|
tmp = get_ticks() + tmo; /* get current timestamp */
|
|
|
|
while (get_ticks() < tmp) /* loop till event */
|
|
/*NOP*/;
|
|
}
|
|
|
|
/*
|
|
* This function is derived from PowerPC code (timebase clock frequency).
|
|
* On ARM it returns the number of timer ticks per second.
|
|
*/
|
|
ulong get_tbclk(void)
|
|
{
|
|
unsigned long freq;
|
|
|
|
asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
|
|
|
|
return freq;
|
|
}
|