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/*
* 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.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#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);
set_timer(CMT_TIMER_RESET);
cmt_timer_start(0);
return 0;
}
unsigned long long get_ticks(void)
{
return cmt0_timer;
}
static vu_long cmcnt;
ulong get_timer(ulong base)
{
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 - base;
}
void set_timer(ulong t)
{
writew((u16) t, CMCOR_0);
}
void reset_timer(void)
{
cmt_timer_stop(0);
set_timer(CMT_TIMER_RESET);
cmt0_timer = 0;
cmt_timer_start(0);
}
void udelay(unsigned long usec)
{
unsigned int start = get_timer(0);
while (get_timer((ulong) start) < (usec * (CONFIG_SYS_HZ / 1000000)))
continue;
}
unsigned long get_tbclk(void)
{
return CONFIG_SYS_HZ;
}
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