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Add MULTIDELAY support to the am335x dmtimer. This will be useful for

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testing Cortex-A8 support in GENERIC.

Sponsored by:	ABT Systems Ltd
This commit is contained in:
Andrew Turner 2016-10-25 18:01:19 +00:00
parent 12f7add9f7
commit 8fcbb32311
2 changed files with 30 additions and 14 deletions
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42
sys/arm/ti/am335x/am335x_dmtimer.c
View File

@ -38,6 +38,10 @@ __FBSDID("$FreeBSD$");
#include <sys/timetc.h>
#include <machine/bus.h>
#ifdef MULTIDELAY
#include <machine/machdep.h> /* For arm_set_delay */
#endif
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
@ -67,6 +71,8 @@ struct am335x_dmtimer_softc {
static struct am335x_dmtimer_softc *am335x_dmtimer_et_sc = NULL;
static struct am335x_dmtimer_softc *am335x_dmtimer_tc_sc = NULL;
static void am335x_dmtimer_delay(int, void *);
/*
* We use dmtimer2 for eventtimer and dmtimer3 for timecounter.
*/
@ -235,6 +241,10 @@ am335x_dmtimer_tc_init(struct am335x_dmtimer_softc *sc)
am335x_dmtimer_tc_sc = sc;
tc_init(&sc->func.tc);
#ifdef MULTIDELAY
arm_set_delay(am335x_dmtimer_delay, sc);
#endif
return (0);
}
@ -328,23 +338,13 @@ static devclass_t am335x_dmtimer_devclass;
DRIVER_MODULE(am335x_dmtimer, simplebus, am335x_dmtimer_driver, am335x_dmtimer_devclass, 0, 0);
MODULE_DEPEND(am335x_dmtimer, am335x_prcm, 1, 1, 1);
void
DELAY(int usec)
static void
am335x_dmtimer_delay(int usec, void *arg)
{
struct am335x_dmtimer_softc *sc;
struct am335x_dmtimer_softc *sc = arg;
int32_t counts;
uint32_t first, last;
sc = am335x_dmtimer_tc_sc;
if (sc == NULL) {
for (; usec > 0; usec--)
for (counts = 200; counts > 0; counts--)
/* Prevent gcc from optimizing out the loop */
cpufunc_nullop();
return;
}
/* Get the number of times to count */
counts = (usec + 1) * (sc->sysclk_freq / 1000000);
@ -361,3 +361,19 @@ DELAY(int usec)
}
}
#ifndef MULTIDELAY
void
DELAY(int usec)
{
int32_t counts;
if (am335x_dmtimer_tc_sc == NULL) {
for (; usec > 0; usec--)
for (counts = 200; counts > 0; counts--)
/* Prevent gcc from optimizing out the loop */
cpufunc_nullop();
return;
} else
am335x_dmtimer_delay(usec, am335x_dmtimer_tc_sc);
}
#endif

2
sys/arm/ti/ti_machdep.c
View File

@ -124,5 +124,5 @@ static platform_method_t am335x_methods[] = {
PLATFORMMETHOD_END,
};
FDT_PLATFORM_DEF(am335x, "am335x", 0, "ti,am335x", 0);
FDT_PLATFORM_DEF(am335x, "am335x", 0, "ti,am335x", 200);
#endif