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From: Andy Shevchenko <andy.shevchenko@teleca.com>

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The OMAP2 ref timer providing a base for generic timecounting was configured
to reload at HZ similarly to the clock providing the tick interrupt at HZ.
This and the fact that the tc framework expected a full 32 bit counter range
resulted in time running ~40 times faster than normal.

Configure the ref timer as a full range counter to fix this.
This commit is contained in:
matt 2008-07-03 06:19:18 +00:00
parent b2abaa8158
commit db24f36199
1 changed files with 15 additions and 4 deletions
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19
sys/arch/arm/omap/omap2430_mputmr.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: omap2430_mputmr.c,v 1.2 2008/04/27 18:58:45 matt Exp $ */
/* $NetBSD: omap2430_mputmr.c,v 1.3 2008/07/03 06:19:18 matt Exp $ */
/*
* OMAP 2430 GP timers
@ -77,7 +77,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: omap2430_mputmr.c,v 1.2 2008/04/27 18:58:45 matt Exp $");
__KERNEL_RCSID(0, "$NetBSD: omap2430_mputmr.c,v 1.3 2008/07/03 06:19:18 matt Exp $");
#include "opt_omap.h"
#include "opt_cpuoptions.h"
@ -237,7 +237,7 @@ cpu_initclocks(void)
setclockrate(clock_sc, hz);
setclockrate(stat_sc, stathz);
setclockrate(ref_sc, hz);
setclockrate(ref_sc, 0);
/*
@ -299,8 +299,19 @@ calc_timer_factors(int ints_per_sec, timer_factors *tf)
{
uint32_t ptv_power; /* PS */
uint32_t count_freq;
static const uint32_t us_per_sec = 1000000;
const uint32_t us_per_sec = 1000000;
if (ints_per_sec == 0) {
/*
* When ints_per_sec equal to zero there is mean full range
* timer usage. Nevertheless autoreload mode is still enabled.
*/
tf->ptv = 0;
tf->reload = 0;
tf->counts_per_usec = OMAP_MPU_TIMER_CLOCK_FREQ / us_per_sec;
return;
}
tf->ptv = 8;
for (;;) {