/* Delay x useconds */
void __udelay(unsigned long usec)
{
ulong ini, end;
ini = READ_TIMER();
end = ini + USEC_TO_COUNT(usec);
while ((signed)(end - READ_TIMER()) > 0)
;
}
/* Restart counting from 0 */
void reset_timer(void)
{
ulong val;
writel(0, CONFIG_SYS_TIMERBASE + MTU_LR(0));
/*
* The load-register isn't really immediate: it changes on clock
* edges, so we must wait for our newly-written value to appear.
* Since we might miss reading 0, wait for any change in value.
*/
val = READ_TIMER();
while (READ_TIMER() == val)
;
}
/* delay x useconds */
void __udelay(unsigned long usec)
{
long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
ulong now, last = READ_TIMER();
while (tmo > 0) {
now = READ_TIMER();
if (now > last) /* normal (non rollover) */
tmo -= now - last;
else /* rollover */
tmo -= TIMER_LOAD_VAL - last + now;
last = now;
}
}
int timer_init(void)
{
u32 synth;
/* Prescaler setting */
#if defined(CONFIG_SPEAR3XX)
writel(MISC_PRSC_CFG, &misc_regs_p->prsc2_clk_cfg);
synth = MISC_GPT4SYNTH;
#elif defined(CONFIG_SPEAR600)
writel(MISC_PRSC_CFG, &misc_regs_p->prsc1_clk_cfg);
synth = MISC_GPT3SYNTH;
#else
# error Incorrect config. Can only be SPEAR{600|300|310|320}
#endif
writel(readl(&misc_regs_p->periph_clk_cfg) | synth,
&misc_regs_p->periph_clk_cfg);
/* disable timers */
writel(GPT_PRESCALER_1 | GPT_MODE_AUTO_RELOAD, &gpt_regs_p->control);
/* load value for free running */
writel(GPT_FREE_RUNNING, &gpt_regs_p->compare);
/* auto reload, start timer */
writel(readl(&gpt_regs_p->control) | GPT_ENABLE, &gpt_regs_p->control);
/* Reset the timer */
lastdec = READ_TIMER();
timestamp = 0;
return 0;
}
int timer_init(void)
{
/* Timer1 clock configuration */
writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq);
writel(readl(&stv0991_cgu_regs->cgu_enable_2) |
TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2);
/* Stop the timer */
writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);
writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc);
/* Configure timer for auto-reload */
writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD,
&gpt1_regs_ptr->cr1);
/* load value for free running */
writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr);
/* start timer */
writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN,
&gpt1_regs_ptr->cr1);
/* Reset the timer */
lastdec = READ_TIMER();
timestamp = 0;
return 0;
}
/* Configure a free-running, auto-wrap counter with no prescaler */
int timer_init(void)
{
ulong val;
writel(MTU_CRn_ENA | MTU_CRn_PRESCALE_1 | MTU_CRn_32BITS,
CONFIG_SYS_TIMERBASE + MTU_CR(0));
/* Reset the timer */
writel(0, CONFIG_SYS_TIMERBASE + MTU_LR(0));
/*
* The load-register isn't really immediate: it changes on clock
* edges, so we must wait for our newly-written value to appear.
* Since we might miss reading 0, wait for any change in value.
*/
val = READ_TIMER();
while (READ_TIMER() == val)
;
return 0;
}
ulong get_timer_masked(void)
{
/* current tick value */
ulong now = TICKS_TO_HZ(READ_TIMER());
if (now >= gd->lastinc) /* normal (non rollover) */
gd->tbl += (now - gd->lastinc);
else /* rollover */
gd->tbl += (TICKS_TO_HZ(TIMER_LOAD_VAL) - gd->lastinc) + now;
gd->lastinc = now;
return gd->tbl;
}
ulong get_timer_masked (void)
{
ulong now = READ_TIMER();
if (lastdec >= now) {
/* normal mode */
timestamp += lastdec - now;
} else {
/* we have an overflow ... */
timestamp += lastdec + timer_load_val - now;
}
lastdec = now;
return timestamp;
}
static ulong get_timer_masked(void)
{
ulong now = READ_TIMER();
if (now >= lastdec) {
/* normal mode */
timestamp += now - lastdec;
} else {
/* we have an overflow ... */
timestamp += now + GPT_FREE_RUNNING - lastdec;
}
lastdec = now;
return timestamp;
}
/*
* 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)
{
ulong now = READ_TIMER();
if (gd->lastinc >= now) {
/* normal mode */
gd->timer_reset_value += gd->lastinc - now;
} else {
/* we have an overflow ... */
gd->timer_reset_value += gd->lastinc + gd->timer_rate_hz - now;
}
gd->lastinc = now;
return gd->timer_reset_value;
}
void reset_timer_masked (void)
{
/* reset time */
lastdec = READ_TIMER();
timestamp = 0;
}
ulong get_curr_timer(void)
{
return READ_TIMER();
}
u64 get_timer_us(void)
{
return COUNT_TO_USEC(READ_TIMER());
}
/* Return how many HZ passed since "base" */
ulong get_timer(ulong base)
{
return TICKS_TO_HZ(READ_TIMER()) - base;
}
void reset_timer_masked(void)
{
/* reset time */
gd->lastinc = READ_TIMER();
gd->timer_reset_value = 0;
}
