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#include "project.h"
static volatile unsigned us_ptp_idx;
static volatile uint64_t us_ptp_freq[2];
static volatile uint64_t us_ptp_offset[2];
static volatile uint64_t us_ptp_phase[2];
static int64_t ptp_phase;
static int64_t ptp_freq = PTP_CLOCK_HZ;
static int64_t ptp_offset;
int ptp_offset_known;
static void us_put (void)
{
unsigned i = us_ptp_idx;
i ^= 1;
us_ptp_freq[i] = ptp_freq;
us_ptp_offset[i] = ptp_offset;
us_ptp_phase[i] = ptp_phase;
compiler_mb();
us_ptp_idx = i;
}
static void us_get (uint64_t *f, uint64_t *o, uint64_t *p)
{
unsigned i;
do {
i = us_ptp_idx;
*f = us_ptp_freq[i];
*o = us_ptp_offset[i];
*p = us_ptp_phase[i];
compiler_mb();
} while (i != us_ptp_idx);
}
static void modify_ptp_freq (uint64_t now, uint64_t new)
{
int64_t pd1, pd2, te;
pd1 = now - ptp_phase;
te = pd1 / ptp_freq;
pd1 %= ptp_freq;
if (pd1 > (ptp_freq >> 1)) {
te++;
pd1 = pd1 - ptp_freq;
}
ptp_freq = new;
pd2 = pd1 + (te * ptp_freq);
ptp_phase = now - pd2;
}
uint64_t ptp_to_u64 (uint32_t l, uint32_t h)
{
uint64_t ret;
ret = h;
ret <<= 31;
ret |= l;
return ret;
}
uint64_t ptp_get (void)
{
uint32_t pl, ph;
do {
ph = ETH_PTPTSHR;
compiler_mb();
pl = ETH_PTPTSLR;
compiler_mb();
} while (ph != ETH_PTPTSHR);
return ptp_to_u64 (pl, ph);
}
#define FF_B 16
#define FF_A ((FF_B)-1)
#define FF_C 16
static uint64_t fff;
static void fll_init (uint64_t start_freq)
{
fff = start_freq * FF_C;
}
static uint64_t fll (uint64_t obs_freq)
{
uint64_t new_freq;
fff *= FF_A;
fff += obs_freq * FF_C;
fff += FF_B / 2;
fff /= FF_B;
new_freq = fff;
new_freq += FF_C / 2;
new_freq /= FF_C;
return new_freq;
}
static int64_t edge_to_phase (uint64_t edge)
{
int64_t obs_phase;
obs_phase = edge - ptp_phase;
obs_phase %= ptp_freq;
if (obs_phase > ptp_freq / 2)
obs_phase -= ptp_freq;
return obs_phase;
}
#define PF_A 16
static uint64_t pll (int64_t obs_phase)
{
int64_t pd ;
pd = obs_phase / PF_A;
if (!pd) {
if (obs_phase < 0) pd--;
if (obs_phase > 0) pd++;
}
return pd;
}
void ptp_dispatch (uint64_t edge, const char *src)
{
static uint64_t last_edge;
uint64_t obs_freq, obs_phase, new_freq;
static int jump_start = 1;
obs_freq = edge - last_edge;
last_edge = edge;
obs_phase = edge_to_phase (edge);
#ifdef CHATTY_PLLS
printf ("PTP PLL: obs_f=%9d delta_phi=%5d f=%9d %s\r\n",
(int) obs_freq,
(int) obs_phase,
(int) ptp_freq, src);
#endif
/*Ignore bogus observations*/
if (obs_freq > (PTP_CLOCK_HZ + (PTP_CLOCK_HZ / 2)))
return;
if (obs_freq < (PTP_CLOCK_HZ - (PTP_CLOCK_HZ / 2)))
return;
if (jump_start) {
new_freq = obs_freq;
fll_init (new_freq);
modify_ptp_freq (edge, new_freq);
ptp_phase += obs_phase;
jump_start = 0;
} else {
new_freq = fll (obs_freq);
modify_ptp_freq (edge, new_freq);
ptp_phase += pll (obs_phase);
}
us_put();
}
void ptp_set_offset (EPOCH epoch, uint64_t abs)
{
int64_t new_offset;
int diff;
/* Find nearest second to abs*/
abs += ptp_freq >> 2;
abs -= ptp_phase;
abs /= ptp_freq;
new_offset = epoch.s - abs;
if (new_offset != ptp_offset) {
diff = (int) (new_offset - ptp_offset);
printf ("PTP wallclock offset moved by %d\r\n", diff);
ptp_offset = new_offset;
us_put();
}
ptp_offset_known = 1;
}
static EPOCH _ptp_decompose (uint64_t abs, uint64_t f, uint64_t o)
{
EPOCH ret;
ret.s = abs / f;
abs -= f * ret.s;
ret.s += o;
abs *= (uint64_t) 1000000000;
abs = abs / f;
ret.ns = abs;
return ret;
}
EPOCH ptp_decompose_diff (int64_t diff)
{
EPOCH ret;
uint64_t f, o, p;
us_get (&f, &o, &p);
if (diff >= 0)
return _ptp_decompose (diff, f, o);
ret = _ptp_decompose (-diff, f, o);
ret.s = -ret.s;
ret.ns = -ret.ns;
return ret;
}
EPOCH ptp_decompose (uint64_t abs)
{
uint64_t f, o, p;
us_get (&f, &o, &p);
abs -= p;
return _ptp_decompose (abs, f, o);
}
void ptp_slow_tick (void)
{
}
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