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#include <common.h>
#include <mach/netx-regs.h>
int timer_init (void)
{
/* disable timer initially */
GPIO_REG(GPIO_COUNTER_CTRL(0)) = 0;
/* Reset the timer value to zero */
GPIO_REG(GPIO_COUNTER_CURRENT(0)) = 0;
GPIO_REG(GPIO_COUNTER_MAX(0)) = 0xffffffff;
GPIO_REG(GPIO_COUNTER_CTRL(0)) = COUNTER_CTRL_RUN;
return 0;
}
/* current timestamp in ms */
static unsigned long timestamp = 0;
static unsigned long last_timer = 0;
/* We can't detect overruns here since we don't know how often
* we get called. The only thing we can do is to make sure that
* time moves forward.
*/
ulong get_timer (ulong start)
{
unsigned long cur_timer = GPIO_REG(GPIO_COUNTER_CURRENT(0));
unsigned long time_inc;
if(cur_timer > last_timer)
time_inc = (cur_timer - last_timer) / 100000;
else
time_inc = ((0xffffffff - last_timer) + cur_timer) / 100000;
if(time_inc)
last_timer = cur_timer;
timestamp += time_inc;
return timestamp - start;
}
void mdelay(unsigned long msec)
{
unsigned long now = get_timer(0);
while( get_timer(0) < now + msec );
}
void udelay(unsigned long usec)
{
unsigned long start, end, msec = usec / 1000;
if(msec)
mdelay(msec);
usec -= msec * 1000;
start = GPIO_REG(GPIO_COUNTER_CURRENT(0));
end = start + usec * 100;
if(end < start) {
/* wait for overrun */
while( GPIO_REG(GPIO_COUNTER_CURRENT(0)) > start);
}
while( GPIO_REG(GPIO_COUNTER_CURRENT(0)) < end);
}
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