#include <common.h>
#include <asm/io.h>
-static ulong timestamp;
-static ulong lastinc;
+DECLARE_GLOBAL_DATA_PTR;
+
static struct gptimer *timer_base = (struct gptimer *)CONFIG_SYS_TIMERBASE;
/*
* Nothing really to do with interrupts, just starts up a counter.
- * We run the counter with 13MHz, divided by 8, resulting in timer
- * frequency of 1.625MHz. With 32bit counter register, counter
- * overflows in ~44min
*/
-/* 13MHz / 8 = 1.625MHz */
-#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
-#define TIMER_LOAD_VAL 0xffffffff
+#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
+#define TIMER_OVERFLOW_VAL 0xffffffff
+#define TIMER_LOAD_VAL 0
int timer_init(void)
{
writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
&timer_base->tclr);
- reset_timer_masked(); /* init the timestamp and lastinc value */
+ /* reset time, capture current incrementer value time */
+ gd->lastinc = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
+ gd->tbl = 0; /* start "advancing" time stamp from 0 */
return 0;
}
/*
* timer without interrupts
*/
-void reset_timer(void)
-{
- reset_timer_masked();
-}
-
ulong get_timer(ulong base)
{
return get_timer_masked() - base;
}
-void set_timer(ulong t)
-{
- timestamp = t;
-}
-
/* delay x useconds */
void __udelay(unsigned long usec)
{
-#if defined(CONFIG_OMAP44XX)
- /* TODO temporary hack until OMAP4 clock setup routines are present */
- if (usec > 1000)
- usec = usec/1000;
-#endif
long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
unsigned long now, last = readl(&timer_base->tcrr);
while (tmo > 0) {
now = readl(&timer_base->tcrr);
if (last > now) /* count up timer overflow */
- tmo -= TIMER_LOAD_VAL - last + now;
+ tmo -= TIMER_OVERFLOW_VAL - last + now + 1;
else
tmo -= now - last;
last = now;
}
}
-void reset_timer_masked(void)
-{
- /* reset time, capture current incrementer value time */
- lastinc = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
- timestamp = 0; /* start "advancing" time stamp from 0 */
-}
-
ulong get_timer_masked(void)
{
/* current tick value */
ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
- if (now >= lastinc) /* normal mode (non roll) */
+ if (now >= gd->lastinc) /* normal mode (non roll) */
/* move stamp fordward with absoulte diff ticks */
- timestamp += (now - lastinc);
+ gd->tbl += (now - gd->lastinc);
else /* we have rollover of incrementer */
- timestamp += ((TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ))
- - lastinc) + now;
- lastinc = now;
- return timestamp;
+ gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ))
+ - gd->lastinc) + now;
+ gd->lastinc = now;
+ return gd->tbl;
}
/*