mirror of
https://github.com/u-boot/u-boot.git
synced 2025-04-23 22:14:54 +00:00
d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2007,2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
|
|
* Copyright (C) 2008 Renesas Solutions Corp.
|
|
*
|
|
* (C) Copyright 2003
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <init.h>
|
|
#include <time.h>
|
|
#include <asm/io.h>
|
|
#include <asm/processor.h>
|
|
#include <linux/delay.h>
|
|
|
|
#define CMT_CMCSR_INIT 0x0001 /* PCLK/32 */
|
|
#define CMT_CMCSR_CALIB 0x0000
|
|
#define CMT_MAX_COUNTER (0xFFFFFFFF)
|
|
#define CMT_TIMER_RESET (0xFFFF)
|
|
|
|
static vu_long cmt0_timer;
|
|
|
|
static void cmt_timer_start(unsigned int timer)
|
|
{
|
|
writew(readw(CMSTR) | 0x01, CMSTR);
|
|
}
|
|
|
|
static void cmt_timer_stop(unsigned int timer)
|
|
{
|
|
writew(readw(CMSTR) & ~0x01, CMSTR);
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
cmt0_timer = 0;
|
|
/* Divide clock by 32 */
|
|
readw(CMCSR_0);
|
|
writew(CMT_CMCSR_INIT, CMCSR_0);
|
|
|
|
/* User Device 0 only */
|
|
cmt_timer_stop(0);
|
|
writew(CMT_TIMER_RESET, CMCOR_0);
|
|
cmt_timer_start(0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
return cmt0_timer;
|
|
}
|
|
|
|
static vu_long cmcnt = 0;
|
|
static unsigned long get_usec (void)
|
|
{
|
|
ulong data = readw(CMCNT_0);
|
|
|
|
if (data >= cmcnt)
|
|
cmcnt = data - cmcnt;
|
|
else
|
|
cmcnt = (CMT_TIMER_RESET - cmcnt) + data;
|
|
|
|
if ((cmt0_timer + cmcnt) > CMT_MAX_COUNTER)
|
|
cmt0_timer = ((cmt0_timer + cmcnt) - CMT_MAX_COUNTER);
|
|
else
|
|
cmt0_timer += cmcnt;
|
|
|
|
cmcnt = data;
|
|
return cmt0_timer;
|
|
}
|
|
|
|
/* return msec */
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return (get_usec() / 1000) - base;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long end = get_usec() + usec;
|
|
|
|
while (get_usec() < end)
|
|
continue;
|
|
}
|
|
|
|
unsigned long get_tbclk(void)
|
|
{
|
|
return CONFIG_SH_CMT_CLK_FREQ;
|
|
}
|