mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 05:04:26 +00:00
8f0960e837
CONFIG_SYS_HZ of SH2 is not used as frequency of base timer. This is the correct clock of CMT. This changes from CONFIG_SYS_HZ to CONFIG_SH_CMT_CLK_FREQ, in order to use CONFIG_SYS_HZ as clock of CMT. Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
88 lines
1.6 KiB
C
88 lines
1.6 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <asm/processor.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;
|
|
}
|