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powerpc/mpic_timer: fix the time is not accurate caused by GTCRR toggle bit 

When the timer GTCCR toggle bit is inverted, we calculated the rest
of the time is not accurate. So we need to ignore this bit.

Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Wang Dongsheng 2014-01-06 13:23:30 +08:00 committed by Scott Wood
parent 7f83a50ce3
commit 0fd79588f9
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/sysdev/mpic_timer.c
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@ -41,6 +41,7 @@
#define MPIC_TIMER_TCR_ROVR_OFFSET 24
#define TIMER_STOP 0x80000000
#define GTCCR_TOG 0x80000000
#define TIMERS_PER_GROUP 4
#define MAX_TICKS (~0U >> 1)
#define MAX_TICKS_CASCADE (~0U)
@ -327,11 +328,13 @@ void mpic_get_remain_time(struct mpic_timer *handle, struct timeval *time)
casc_priv = priv->timer[handle->num].cascade_handle;
if (casc_priv) {
tmp_ticks = in_be32(&priv->regs[handle->num].gtccr);
tmp_ticks &= ~GTCCR_TOG;
ticks = ((u64)tmp_ticks & UINT_MAX) * (u64)MAX_TICKS_CASCADE;
tmp_ticks = in_be32(&priv->regs[handle->num - 1].gtccr);
ticks += tmp_ticks;
} else {
ticks = in_be32(&priv->regs[handle->num].gtccr);
ticks &= ~GTCCR_TOG;
}
convert_ticks_to_time(priv, ticks, time);