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wcte12xp: Unroll the TDM extraction/insertion from the sframe.

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This change saves around 2.5 us from the interrupt handler.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Michael Spiceland <mspiceland@digium.com>
Acked-by: Kinsey Moore <kmoore@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9889 a0bf4364-ded3-4de4-8d8a-66a801d63aff
This commit is contained in:
Shaun Ruffell 2011-04-04 16:25:54 +00:00
parent 40945a2a00
commit e7ea26ae8d
1 changed files with 49 additions and 12 deletions
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61
drivers/dahdi/wcte12xp/base.c
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@ -1848,11 +1848,29 @@ static void t1_do_counters(struct t1 *wc)
}
}
static void insert_tdm_data(const struct t1 *wc, u8 *sframe)
{
int i;
register u8 *chanchunk;
const int channels = wc->span.channels;
for (i = 0; i < channels; ++i) {
chanchunk = &wc->chans[i]->writechunk[0];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*0] = chanchunk[0];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*1] = chanchunk[1];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*2] = chanchunk[2];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*3] = chanchunk[3];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*4] = chanchunk[4];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*5] = chanchunk[5];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*6] = chanchunk[6];
sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*7] = chanchunk[7];
}
}
static inline void t1_transmitprep(struct t1 *wc, u8 *sframe)
{
int x;
int y;
int chan;
u8 *eframe = sframe;
/* Calculate Transmission */
@ -1866,13 +1884,11 @@ static inline void t1_transmitprep(struct t1 *wc, u8 *sframe)
}
#endif
if (likely(test_bit(INITIALIZED, &wc->bit_flags)))
insert_tdm_data(wc, sframe);
spin_lock(&wc->reglock);
for (x = 0; x < DAHDI_CHUNKSIZE; x++) {
if (likely(test_bit(INITIALIZED, &wc->bit_flags))) {
for (chan = 0; chan < wc->span.channels; chan++)
eframe[(chan+1)*2] = wc->chans[chan]->writechunk[x];
}
/* process the command queue */
for (y = 0; y < 7; y++)
cmd_dequeue(wc, eframe, x, y);
@ -1902,22 +1918,43 @@ static inline bool is_good_frame(const u8 *sframe)
return a != b;
}
/**
* extract_tdm_data() - Move TDM data from sframe to channels.
*
*/
static void extract_tdm_data(struct t1 *wc, const u8 *const sframe)
{
int i;
register u8 *chanchunk;
const int channels = wc->span.channels;
for (i = 0; i < channels; ++i) {
chanchunk = &wc->chans[i]->readchunk[0];
chanchunk[0] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*0];
chanchunk[1] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*1];
chanchunk[2] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*2];
chanchunk[3] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*3];
chanchunk[4] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*4];
chanchunk[5] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*5];
chanchunk[6] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*6];
chanchunk[7] = sframe[(i+1)*2 + (EFRAME_SIZE + EFRAME_GAP)*7];
}
}
static inline void t1_receiveprep(struct t1 *wc, const u8* sframe)
{
int x,chan;
int x;
unsigned char expected;
const u8 *eframe = sframe;
if (!is_good_frame(sframe))
return;
if (likely(test_bit(INITIALIZED, &wc->bit_flags)))
extract_tdm_data(wc, sframe);
spin_lock(&wc->reglock);
for (x = 0; x < DAHDI_CHUNKSIZE; x++) {
if (likely(test_bit(INITIALIZED, &wc->bit_flags))) {
for (chan = 0; chan < wc->span.channels; chan++) {
wc->chans[chan]->readchunk[x] = eframe[(chan+1)*2];
}
}
if (x < DAHDI_CHUNKSIZE - 1) {
expected = wc->rxident+1;
wc->rxident = eframe[EFRAME_SIZE + 1];