blob: dc112261345869e5b0b956b17b8fcdba005a99db [file] [log] [blame]
/*
* (C) Copyright 2006
* Mindspeed Technologies, Inc. <www.mindspeed.com>
*
* 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/arch/bsp.h>
#include <asm/hardware.h>
#define TIMER_LOAD_VAL 0x00ffffff
#define CLOCK_COUNT_PER_USEC (CFG_HZ_CLOCK / 1000 / 1000)
#define USEC_PER_TICK (1000 * 1000 / CFG_HZ)
#define READ_TIMER SoC_timer0_get()
static ulong ts_count, ts_usec;
static ulong lastdec;
int interrupt_init (void)
{
SoC_timer0_set(TIMER_LOAD_VAL);
lastdec = TIMER_LOAD_VAL;
ts_count = 0;
ts_usec = 0;
return (0);
}
void reset_timer_masked (void)
{
lastdec = READ_TIMER;
ts_count = 0;
ts_usec = 0;
}
void reset_timer (void)
{
reset_timer_masked ();
}
/* Returns usecs since last timer reset */
ulong get_timer_raw (void)
{
ulong step;
ulong now = READ_TIMER;
if (now < lastdec) {
/* normal mode */
step = lastdec - now;
} else {
/* we have an overflow ... */
step = (TIMER_LOAD_VAL - now) + lastdec;
}
lastdec = now;
ts_count += step % CLOCK_COUNT_PER_USEC;
ts_usec += step / CLOCK_COUNT_PER_USEC;
if (ts_count >= CLOCK_COUNT_PER_USEC) {
ts_usec += ts_count / CLOCK_COUNT_PER_USEC;
ts_count %= CLOCK_COUNT_PER_USEC;
}
return ts_usec;
}
/* Returns tick count since last timer reset */
ulong get_timer_masked (void)
{
return get_timer_raw() / USEC_PER_TICK;
}
ulong get_timer (ulong base)
{
return get_timer_masked () - base;
}
void udelay_masked (unsigned long usec)
{
ulong endtime = get_timer_raw () + usec;
while (get_timer_raw () < endtime)
;
}
void udelay (unsigned long usec)
{
udelay_masked(usec);
}
/*
* This function is derived from PowerPC code (read timebase as long long).
* On ARM it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
/*
* 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)
{
ulong tbclk;
tbclk = CFG_HZ;
return tbclk;
}
/*
*
*/
void reset_cpu (ulong ignored)
{
while (1);
/* Never reached */
}
/*
* timer without interrupts
*/
void set_timer (ulong t)
{
ts_count = 0;
ts_usec = t * USEC_PER_TICK;
}