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FMC TDC 1ns 5cha - Software
Commit f9c04ec9 authored by Federico Vaga's avatar Federico Vaga
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kernel: improve code readability 

Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
parent aba8d387
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Showing with 30 additions and 32 deletions
kernel/ft-irq.c
View file @ f9c04ec9
......@@ -131,6 +131,7 @@ static inline void process_timestamp(struct fmctdc_dev *ft,
{
struct ft_channel_state *st;
struct ft_wr_timestamp ts;
struct ft_wr_timestamp diff;
int channel, edge, frac;
......@@ -166,49 +167,46 @@ static inline void process_timestamp(struct fmctdc_dev *ft,
if (unlikely(edge != st->expected_edge)) {
/* wait unconditionally for next rising edge */
st->expected_edge = 1;
} else {
return ;
}
if (st->expected_edge == 0) {
/* got a falling edge after a rising one */
struct ft_wr_timestamp diff = ts;
ft_ts_sub(&diff, &st->prev_ts);
if (st->expected_edge != 0) {
st->prev_ts = ts;
st->expected_edge = 1 - st->expected_edge;
return ;
}
/* Check timestamp width. Must be at least 100 ns
(coarse = 12, frac = 2048) */
if (likely
(diff.seconds || diff.coarse > 12
|| (diff.coarse == 12 && diff.frac >= 2048))) {
ts = st->prev_ts;
ft_ts_apply_offset(&ts,
ft->calib.
zero_offset[channel - 1]);
ft_ts_apply_offset(&ts, -ft->calib.wr_offset);
/* got a falling edge after a rising one */
diff = ts;
ft_ts_sub(&diff, &st->prev_ts);
if (st->user_offset)
ft_ts_apply_offset(&ts,
st->user_offset);
/* Check timestamp width. Must be at least 100 ns
(coarse = 12, frac = 2048) */
if (likely(diff.seconds || diff.coarse > 12
|| (diff.coarse == 12 && diff.frac >= 2048))) {
ts = st->prev_ts;
ft_ts_apply_offset(&ts, ft->calib.zero_offset[channel - 1]);
/* Got a dacapo flag? make a gap in
the sequence ID to indicate
an unknown loss of timestamps */
ft_ts_apply_offset(&ts, -ft->calib.wr_offset);
if (st->user_offset)
ft_ts_apply_offset(&ts, st->user_offset);
ts.seq_id = st->cur_seq_id++;
/* Got a dacapo flag? make a gap in the sequence ID to indicate
an unknown loss of timestamps */
if (dacapo_flag) {
ts.seq_id++;
st->cur_seq_id++;
}
ts.seq_id = st->cur_seq_id++;
/* Put the timestamp in the FIFO */
enqueue_timestamp(ft, channel, &ts);
}
} else
st->prev_ts = ts;
if (dacapo_flag) {
ts.seq_id++;
st->cur_seq_id++;
}
st->expected_edge = 1 - st->expected_edge;
/* Put the timestamp in the FIFO */
enqueue_timestamp(ft, channel, &ts);
}
st->expected_edge = 1 - st->expected_edge;
}
static irqreturn_t ft_irq_handler(int irq, void *dev_id)
......
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