static void xpp_set_syncer(xbus_t *xbus, bool on)
{
if(syncer != xbus && on) {
XBUS_DBG(SYNC, xbus, "New syncer\n");
syncer = xbus;
} else if(syncer == xbus && !on) {
XBUS_DBG(SYNC, xbus, "Lost syncer\n");
syncer = NULL;
} else
XBUS_DBG(SYNC, xbus, "ignore %s (current syncer: %s)\n",
(on)?"ON":"OFF",
(syncer) ? syncer->busname : "NO-SYNC");
}
static void reset_sync_counters(void)
{
int i;
//DBG(SYNC, "%d\n", atomic_read(&xpp_tick_counter));
for(i = 0; i < MAX_BUSES; i++) {
xbus_t *xbus = get_xbus(i);
if(!xbus)
continue;
/*
* Don't send to non self_ticking Astribanks:
* - Maybe they didn't finish initialization
* - Or maybe they didn't answer us in the first place
(e.g: wrong firmware version, etc).
*/
if (TRANSPORT_RUNNING(xbus) && xbus->self_ticking) {
if(XBUS_GET(xbus)) {
/* Reset sync LEDs once in a while */
CALL_PROTO(GLOBAL, RESET_SYNC_COUNTERS, xbus, NULL);
XBUS_PUT(xbus);
} else {
static int rate_limit;
if((rate_limit++ % 1003) == 0)
XBUS_DBG(GENERAL, xbus,
"Dropped packet. Is shutting down. (%d)\n", rate_limit);
}
}
put_xbus(xbus);
}
}
void xbus_set_command_timer(xbus_t *xbus, bool on)
{
XBUS_DBG(SYNC, xbus, "%s\n", (on)?"ON":"OFF");
if(on) {
if(!timer_pending(&xbus->command_timer)) {
XBUS_DBG(SYNC, xbus, "add_timer\n");
xbus->command_timer.function = xbus_command_timer;
xbus->command_timer.data = (unsigned long)xbus;
xbus->command_timer.expires = jiffies + 1;
add_timer(&xbus->command_timer);
}
} else if(timer_pending(&xbus->command_timer)) {
XBUS_DBG(SYNC, xbus, "del_timer\n");
del_timer(&xbus->command_timer);
}
}
static void xpp_dev_release(struct device *dev)
{
xbus_t *xbus;
BUG_ON(!dev);
xbus = dev_to_xbus(dev);
XBUS_DBG(GENERAL, xbus, "\n");
}
static int astribank_probe(struct device *dev)
{
xbus_t *xbus;
xbus = dev_to_xbus(dev);
XBUS_DBG(DEVICES, xbus, "SYSFS\n");
return 0;
}
/*
* called from elect_syncer()
* if new_syncer is NULL, than we move all to SYNC_MODE_PLL
* for ZAPTEL sync.
*/
static void update_sync_master(xbus_t *new_syncer)
{
const char *msg = (force_zaptel_sync) ? "ZAPTEL" : "NO-SYNC";
int i;
unsigned long flags;
DBG(SYNC, "%s => %s\n",
(syncer) ? syncer->busname : msg,
(new_syncer) ? new_syncer->busname : msg);
/*
* This global locking protects:
* - The ref_ticker so it won't be used while we change it.
* - The xbus_drift_clear() from corrupting driftinfo data.
*/
spin_lock_irqsave(&ref_ticker_lock, flags);
if(syncer)
xbus_drift_clear(syncer); /* Clean old data */
if(new_syncer) {
XBUS_DBG(SYNC, new_syncer, "pcm_rx_counter=%d\n",
atomic_read(&new_syncer->pcm_rx_counter));
force_zaptel_sync = 0;
ref_ticker = &new_syncer->ticker;
xbus_drift_clear(new_syncer); /* Clean new data */
xbus_request_sync(new_syncer, SYNC_MODE_AB);
} else if(force_zaptel_sync) {
ref_ticker = &zaptel_ticker;
} else {
ref_ticker = NULL;
}
spin_unlock_irqrestore(&ref_ticker_lock, flags);
DBG(SYNC, "stop unwanted syncers\n");
/* Shut all down except the wanted sync master */
for(i = 0; i < MAX_BUSES; i++) {
xbus_t *xbus = get_xbus(i);
if(!xbus)
continue;
if(TRANSPORT_RUNNING(xbus) && xbus != new_syncer) {
if(xbus->self_ticking)
xbus_request_sync(xbus, SYNC_MODE_PLL);
else
XBUS_DBG(SYNC, xbus, "Not self_ticking yet. Ignore\n");
}
put_xbus(xbus);
}
}
void astribank_uevent_send(xbus_t *xbus, enum kobject_action act)
{
struct kobject *kobj;
kobj = &xbus->astribank.kobj;
XBUS_DBG(DEVICES, xbus, "SYFS bus_id=%s action=%d\n",
dev_name(&xbus->astribank), act);
kobject_uevent(kobj, act);
}
int xbus_sysfs_create(xbus_t *xbus)
{
struct device *astribank;
int ret = 0;
BUG_ON(!xbus);
astribank = &xbus->astribank;
BUG_ON(!astribank);
XBUS_DBG(GENERAL, xbus, "\n");
device_initialize(astribank);
astribank->bus = &xpp_bus_type;
astribank->parent = &xpp_bus;
snprintf(astribank->bus_id, BUS_ID_SIZE, "xbus-%02d", xbus->num);
astribank->driver_data = NULL; /* override below */
astribank->release = xpp_dev_release;
ret = device_register(astribank);
if(ret) {
XBUS_ERR(xbus, "%s: device_add failed: %d\n", __FUNCTION__, ret);
goto out;
}
ret = device_create_file(astribank, &dev_attr_connector);
if(ret) {
XBUS_ERR(xbus, "%s: device_create_file failed: %d\n", __FUNCTION__, ret);
goto out;
}
ret = device_create_file(astribank, &dev_attr_label);
if(ret) {
XBUS_ERR(xbus, "%s: device_create_file failed: %d\n", __FUNCTION__, ret);
goto out;
}
ret = device_create_file(astribank, &dev_attr_status);
if(ret) {
XBUS_ERR(xbus, "%s: device_create_file failed: %d\n", __FUNCTION__, ret);
goto out;
}
ret = device_create_file(astribank, &dev_attr_timing);
if(ret) {
XBUS_ERR(xbus, "%s: device_create_file failed: %d\n", __FUNCTION__, ret);
goto out;
}
ret = device_create_file(astribank, &dev_attr_cls);
if(ret) {
XBUS_ERR(xbus, "%s: device_create_file failed: %d\n", __FUNCTION__, ret);
goto out;
}
#ifdef SAMPLE_TICKS
ret = device_create_file(astribank, &dev_attr_samples);
if(ret) {
XBUS_ERR(xbus, "%s: device_create_file failed: %d\n", __FUNCTION__, ret);
goto out;
}
#endif
astribank->driver_data = xbus; /* Everything is good */
out:
return ret;
}
/*
* Called when the Astribank replies to a sync change request
*/
void got_new_syncer(xbus_t *xbus, enum sync_mode mode, int drift)
{
unsigned long flags;
XBUS_DBG(SYNC, xbus, "Mode %s (%d), drift=%d (pcm_rx_counter=%d)\n",
sync_mode_name(mode), mode, drift, atomic_read(&xbus->pcm_rx_counter));
spin_lock_irqsave(&xbus->lock, flags);
xbus->sync_adjustment = (signed char)drift;
if(xbus->sync_mode == mode) {
XBUS_DBG(SYNC, xbus, "Already in mode '%s'. Ignored\n", sync_mode_name(mode));
goto out;
}
switch(mode) {
case SYNC_MODE_AB:
xbus->sync_mode = mode;
xbus_set_command_timer(xbus, 0);
xbus->self_ticking = 1;
xpp_set_syncer(xbus, 1);
global_ticker = xbus;
break;
case SYNC_MODE_PLL:
xbus->sync_mode = mode;
xbus_set_command_timer(xbus, 0);
xbus->self_ticking = 1;
xpp_set_syncer(xbus, 0);
global_ticker = xbus;
break;
case SYNC_MODE_NONE: /* lost sync source */
xbus->sync_mode = mode;
xbus_set_command_timer(xbus, 1);
xbus->self_ticking = 0;
xpp_set_syncer(xbus, 0);
break;
case SYNC_MODE_QUERY: /* ignore */
break;
default:
XBUS_ERR(xbus, "%s: unknown mode=0x%X\n", __FUNCTION__, mode);
}
out:
spin_unlock_irqrestore(&xbus->lock, flags);
}
int zaptel_sync_tick(struct zt_span *span, int is_master)
{
xpd_t *xpd = span->pvt;
static int redundant_ticks; /* for extra spans */
struct timeval now;
if(!force_zaptel_sync)
goto noop;
do_gettimeofday(&now);
BUG_ON(!xpd);
/*
* Detect if any of our spans is zaptel sync master
*/
if(is_master) {
static int rate_limit;
if(xpd->xbus != syncer && ((rate_limit % 1003) == 0)) {
XPD_ERR(xpd,
"Zaptel master, but syncer=%s\n",
xpd->xbus->busname);
}
if((rate_limit % 5003) == 0)
XPD_NOTICE(xpd, "Zaptel master: ignore ZAPTEL sync\n");
rate_limit++;
goto noop;
}
/* Now we know for sure someone else is zaptel sync master */
if(syncer) {
static int rate_limit;
if((rate_limit++ % 5003) == 0)
XBUS_DBG(SYNC, syncer,
"Already a syncer, ignore ZAPTEL sync\n");
goto noop;
}
/* ignore duplicate calls from all our registered spans */
if((redundant_ticks++ % total_registered_spans()) != 0) {
#if 0
static int rate_limit;
if((rate_limit++ % 1003) < 16)
XPD_NOTICE(xpd, "boop (%d)\n", zaptel_tick_count);
#endif
goto noop;
}
xpp_ticker_step(&zaptel_ticker, &now);
zaptel_tick_count++;
//flip_parport_bit(1);
return 0;
noop:
return 0; /* No auto sync from zaptel */
}
static int xframe_receive_cmd(xbus_t *xbus, xframe_t *xframe)
{
byte *xframe_end;
xpacket_t *pack;
byte *p;
int len;
int ret;
if(debug & DBG_COMMANDS)
dump_xframe("RX-CMD", xbus, xframe, DBG_ANY);
p = xframe->packets;
xframe_end = p + XFRAME_LEN(xframe);
do {
pack = (xpacket_t *)p;
len = XPACKET_LEN(pack);
/* Sanity checks */
if(unlikely(XPACKET_OP(pack) == XPROTO_NAME(GLOBAL,PCM_READ))) {
static int rate_limit;
if((rate_limit++ % 1003) == 0) {
XBUS_DBG(GENERAL, xbus, "A PCM packet within a Non-PCM xframe\n");
dump_xframe("In Non-PCM xframe", xbus, xframe, debug);
}
ret = -EPROTO;
goto out;
}
p += len;
if(p > xframe_end || len < RPACKET_HEADERSIZE) {
static int rate_limit;
if((rate_limit++ % 1003) == 0) {
XBUS_NOTICE(xbus, "Invalid packet length %d\n", len);
dump_xframe("BAD LENGTH", xbus, xframe, debug);
}
ret = -EPROTO;
goto out;
}
ret = packet_process(xbus, pack);
if(unlikely(ret < 0))
break;
} while(p < xframe_end);
out:
FREE_RECV_XFRAME(xbus, xframe);
return ret;
}
static void send_drift(xbus_t *xbus, int drift)
{
struct timeval now;
const char *msg;
BUG_ON(abs(drift) > SYNC_ADJ_MAX);
do_gettimeofday(&now);
if(drift > xbus->sync_adjustment)
msg = "up";
else
msg = "down";
XBUS_DBG(SYNC, xbus, "%sDRIFT adjust %s (%d) (last update %ld seconds ago)\n",
(disable_pll_sync) ? "Fake " : "",
msg, drift, now.tv_sec - xbus->pll_updated_at);
if(!disable_pll_sync)
CALL_PROTO(GLOBAL, SYNC_SOURCE, xbus, NULL, SYNC_MODE_PLL, drift);
xbus->pll_updated_at = now.tv_sec;
}
static DEVICE_ATTR_WRITER(xbus_state_store, dev, buf, count)
{
xbus_t *xbus;
xbus = dev_to_xbus(dev);
XBUS_DBG(GENERAL, xbus, "%s\n", buf);
if (strncmp(buf, "stop", 4) == 0)
xbus_deactivate(xbus);
else if (XBUS_IS(xbus, IDLE) && strncmp(buf, "start", 5) == 0)
xbus_activate(xbus);
else {
XBUS_NOTICE(xbus,
"%s: Illegal action %s in state %s. Ignored.\n",
__func__, buf, xbus_statename(XBUS_STATE(xbus)));
return -EINVAL;
}
return count;
}
int xframe_receive(xbus_t *xbus, xframe_t *xframe)
{
int ret = 0;
struct timeval now;
struct timeval tv_received;
int usec;
if(XFRAME_LEN(xframe) < RPACKET_HEADERSIZE) {
static int rate_limit;
if((rate_limit++ % 1003) == 0) {
XBUS_NOTICE(xbus, "short xframe\n");
dump_xframe("short xframe", xbus, xframe, debug);
}
FREE_RECV_XFRAME(xbus, xframe);
return -EPROTO;
}
if(!XBUS_FLAGS(xbus, CONNECTED)) {
XBUS_DBG(GENERAL, xbus, "Dropped xframe. Is shutting down.\n");
return -ENODEV;
}
tv_received = xframe->tv_received;
/*
* We want to check that xframes do not mix PCM and other commands
*/
if(XPACKET_IS_PCM((xpacket_t *)xframe->packets)) {
if(!XBUS_IS(xbus, READY))
FREE_RECV_XFRAME(xbus, xframe);
else
xframe_receive_pcm(xbus, xframe);
} else {
XBUS_COUNTER(xbus, RX_CMD)++;
ret = xframe_receive_cmd(xbus, xframe);
}
/* Calculate total processing time */
do_gettimeofday(&now);
usec = (now.tv_sec - tv_received.tv_sec) * 1000000 +
now.tv_usec - tv_received.tv_usec;
if(usec > xbus->max_rx_process)
xbus->max_rx_process = usec;
return ret;
}
void xbus_sysfs_remove(xbus_t *xbus)
{
struct device *astribank;
BUG_ON(!xbus);
XBUS_DBG(GENERAL, xbus, "\n");
astribank = &xbus->astribank;
BUG_ON(!astribank);
if(!astribank->driver_data)
return;
BUG_ON(astribank->driver_data != xbus);
#ifdef SAMPLE_TICKS
device_remove_file(&xbus->astribank, &dev_attr_samples);
#endif
device_remove_file(&xbus->astribank, &dev_attr_cls);
device_remove_file(&xbus->astribank, &dev_attr_timing);
device_remove_file(&xbus->astribank, &dev_attr_status);
device_remove_file(&xbus->astribank, &dev_attr_label);
device_remove_file(&xbus->astribank, &dev_attr_connector);
device_unregister(&xbus->astribank);
}
static inline void pcm_frame_out(xbus_t *xbus, xframe_t *xframe)
{
unsigned long flags;
struct timeval now;
unsigned long usec;
spin_lock_irqsave(&xbus->lock, flags);
do_gettimeofday(&now);
if(unlikely(disable_pcm || !TRANSPORT_RUNNING(xbus)))
goto dropit;
if(XPACKET_ADDR_SYNC((xpacket_t *)xframe->packets)) {
usec = usec_diff(&now, &xbus->last_tx_sync);
xbus->last_tx_sync = now;
/* ignore startup statistics */
if(likely(atomic_read(&xbus->pcm_rx_counter) > BIG_TICK_INTERVAL)) {
if(abs(usec - 1000) > TICK_TOLERANCE) {
static int rate_limit;
if((rate_limit++ % 5003) == 0)
XBUS_DBG(SYNC, xbus, "Bad PCM TX timing(%d): usec=%ld.\n",
rate_limit, usec);
}
if(usec > xbus->max_tx_sync)
xbus->max_tx_sync = usec;
if(usec < xbus->min_tx_sync)
xbus->min_tx_sync = usec;
}
}
spin_unlock_irqrestore(&xbus->lock, flags);
/* OK, really send it */
if(debug & DBG_PCM )
dump_xframe("TX_XFRAME_PCM", xbus, xframe, debug);
send_pcm_frame(xbus, xframe);
XBUS_COUNTER(xbus, TX_XFRAME_PCM)++;
return;
dropit:
spin_unlock_irqrestore(&xbus->lock, flags);
FREE_SEND_XFRAME(xbus, xframe);
}
void elect_syncer(const char *msg)
{
int i;
int j;
uint timing_priority = 0;
xpd_t *best_xpd = NULL;
xbus_t *the_xbus = NULL;
for(i = 0; i < MAX_BUSES; i++) {
xbus_t *xbus = get_xbus(i);
if(!xbus)
continue;
if(!the_xbus)
the_xbus = xbus;
if (TRANSPORT_RUNNING(xbus)) {
for(j = 0; j < MAX_XPDS; j++) {
xpd_t *xpd = xpd_of(xbus, j);
if(!xpd || !xpd->card_present)
continue;
if(xpd->timing_priority > timing_priority) {
timing_priority = xpd->timing_priority;
best_xpd = xpd;
}
}
}
put_xbus(xbus);
}
if(best_xpd) {
the_xbus = best_xpd->xbus;
XPD_DBG(SYNC, best_xpd, "%s: elected with priority %d\n", msg, timing_priority);
} else if(the_xbus) {
XBUS_DBG(SYNC, the_xbus, "%s: elected\n", msg);
} else
DBG(SYNC, "%s: No more syncers\n", msg);
if(the_xbus != syncer)
update_sync_master(the_xbus);
}
static void xpp_drift_step(xbus_t *xbus, const struct timeval *tv)
{
struct xpp_drift *driftinfo = &xbus->drift;
struct xpp_ticker *ticker = &xbus->ticker;
unsigned long flags;
bool cycled;
spin_lock_irqsave(&driftinfo->lock, flags);
cycled = xpp_ticker_step(&xbus->ticker, tv);
if(ref_ticker && syncer && xbus->sync_mode == SYNC_MODE_PLL) {
int new_delta_tick = ticker->count - ref_ticker->count;
int lost_ticks = new_delta_tick - driftinfo->delta_tick;
driftinfo->delta_tick = new_delta_tick;
if(lost_ticks) {
driftinfo->lost_ticks++;
driftinfo->lost_tick_count += abs(lost_ticks);
XBUS_DBG(SYNC, xbus, "Lost %d tick%s\n",
lost_ticks,
(abs(lost_ticks) > 1) ? "s": "");
ticker->cycle = SYNC_ADJ_QUICK;
if(abs(lost_ticks) > 100)
ticker->count = ref_ticker->count;
} else {
long usec_delta;
bool nofix = 0;
usec_delta = (long)usec_diff(
&ticker->last_sample.tv,
&ref_ticker->last_sample.tv);
usec_delta -= driftinfo->wanted_offset;
sample_tick(xbus, usec_delta);
if(abs(usec_delta) > 300) {
/*
* We are close to the edge, send a brutal
* fix, and skip calculation until next time.
*/
if(usec_delta > 0 && xbus->sync_adjustment > -SYNC_ADJ_MAX) {
XBUS_DBG(SYNC, xbus, "Pullback usec_delta=%ld\n", usec_delta);
send_drift(xbus, -SYNC_ADJ_MAX); /* emergency push */
}
if(usec_delta < 0 && xbus->sync_adjustment < SYNC_ADJ_MAX) {
XBUS_DBG(SYNC, xbus, "Pushback usec_delta=%ld\n", usec_delta);
send_drift(xbus, SYNC_ADJ_MAX); /* emergency push */
}
ticker->cycle = SYNC_ADJ_QUICK;
nofix = 1;
} else {
/* good data, use it */
if(usec_delta > driftinfo->delta_max)
driftinfo->delta_max = usec_delta;
if(usec_delta < driftinfo->delta_min)
driftinfo->delta_min = usec_delta;
}
if(!nofix && cycled) {
int offset = 0;
driftinfo->median = (driftinfo->delta_max + driftinfo->delta_min) / 2;
driftinfo->jitter = driftinfo->delta_max - driftinfo->delta_min;
if(abs(driftinfo->median) >= 150) { /* more than 1 usb uframe */
int factor = abs(driftinfo->median) / 125;
factor = 1 + (factor * 8000) / ticker->cycle;
if(driftinfo->median > 0)
offset = driftinfo->calc_drift - factor;
else
offset = driftinfo->calc_drift + factor;
/* for large median, push some more */
if(abs(driftinfo->median) >= 300) { /* more than 2 usb uframes */
ticker->cycle = SYNC_ADJ_QUICK;
XBUS_NOTICE(xbus,
"Back to quick: median=%d\n",
driftinfo->median);
}
} else {
ticker->cycle += 500;
if(ticker->cycle >= SYNC_ADJ_SLOW)
ticker->cycle = SYNC_ADJ_SLOW;
}
driftinfo->calc_drift = offset;
XBUS_DBG(SYNC, xbus,
"ADJ: min=%d max=%d jitter=%d median=%d offset=%d\n",
driftinfo->delta_min,
driftinfo->delta_max,
driftinfo->jitter,
driftinfo->median,
offset);
if(offset < -SYNC_ADJ_MAX)
offset = -SYNC_ADJ_MAX;
if(offset > SYNC_ADJ_MAX)
offset = SYNC_ADJ_MAX;
xbus->sync_adjustment_offset = offset;
if(xbus != syncer && xbus->sync_adjustment != offset)
send_drift(xbus, offset);
driftinfo_recalc(driftinfo);
}
}
}
spin_unlock_irqrestore(&driftinfo->lock, flags);
}
void xbus_request_sync(xbus_t *xbus, enum sync_mode mode)
{
BUG_ON(!xbus);
XBUS_DBG(SYNC, xbus, "sent request (mode=%d)\n", mode);
CALL_PROTO(GLOBAL, SYNC_SOURCE, xbus, NULL, mode, 0);
}