static void ni_tio_get_clock_src(struct ni_gpct *counter,
lsampl_t * clock_source, lsampl_t * period_ns)
{
static const unsigned pico_per_nano = 1000;
uint64_t temp64;
*clock_source = ni_tio_generic_clock_src_select(counter);
temp64 = ni_tio_clock_period_ps(counter, *clock_source);
do_div(temp64, pico_per_nano);
*period_ns = temp64;
}
static void ni_tio_set_sync_mode(struct ni_gpct *counter, int force_alt_sync)
{
struct ni_gpct_device *counter_dev = counter->counter_dev;
const unsigned counting_mode_reg =
NITIO_Gi_Counting_Mode_Reg(counter->counter_index);
static const uint64_t min_normal_sync_period_ps = 25000;
const uint64_t clock_period_ps = ni_tio_clock_period_ps(counter,
ni_tio_generic_clock_src_select(counter));
if (ni_tio_counting_mode_registers_present(counter_dev) == 0)
return;
switch (ni_tio_get_soft_copy(counter,
counting_mode_reg) & Gi_Counting_Mode_Mask) {
case Gi_Counting_Mode_QuadratureX1_Bits:
case Gi_Counting_Mode_QuadratureX2_Bits:
case Gi_Counting_Mode_QuadratureX4_Bits:
case Gi_Counting_Mode_Sync_Source_Bits:
force_alt_sync = 1;
break;
default:
break;
}
/* It's not clear what we should do if clock_period is unknown, so we are not
using the alt sync bit in that case, but allow the caller to decide by using the
force_alt_sync parameter. */
if (force_alt_sync ||
(clock_period_ps
&& clock_period_ps < min_normal_sync_period_ps)) {
ni_tio_set_bits(counter, counting_mode_reg,
Gi_Alternate_Sync_Bit(counter_dev->variant),
Gi_Alternate_Sync_Bit(counter_dev->variant));
} else {
ni_tio_set_bits(counter, counting_mode_reg,
Gi_Alternate_Sync_Bit(counter_dev->variant), 0x0);
}
}
static void ni_tio_set_sync_mode(struct ni_gpct *counter, int force_alt_sync)
{
struct ni_gpct_device *counter_dev = counter->counter_dev;
const unsigned counting_mode_reg =
NITIO_Gi_Counting_Mode_Reg(counter->counter_index);
static const uint64_t min_normal_sync_period_ps = 25000;
const uint64_t clock_period_ps = ni_tio_clock_period_ps(counter,
ni_tio_generic_clock_src_select
(counter));
if (ni_tio_counting_mode_registers_present(counter_dev) == 0)
return;
switch (ni_tio_get_soft_copy(counter,
counting_mode_reg) & Gi_Counting_Mode_Mask)
{
case Gi_Counting_Mode_QuadratureX1_Bits:
case Gi_Counting_Mode_QuadratureX2_Bits:
case Gi_Counting_Mode_QuadratureX4_Bits:
case Gi_Counting_Mode_Sync_Source_Bits:
force_alt_sync = 1;
break;
default:
break;
}
if (force_alt_sync ||
(clock_period_ps && clock_period_ps < min_normal_sync_period_ps)) {
ni_tio_set_bits(counter, counting_mode_reg,
Gi_Alternate_Sync_Bit(counter_dev->variant),
Gi_Alternate_Sync_Bit(counter_dev->variant));
} else {
ni_tio_set_bits(counter, counting_mode_reg,
Gi_Alternate_Sync_Bit(counter_dev->variant),
0x0);
}
}
