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ptp: ptp_clockmatrix: Add .getmaxphase ptp_clock_info callback 

Advertise the maximum offset the .adjphase callback is capable of
supporting in nanoseconds for IDT ClockMatrix devices. Depend on
ptp_clock_adjtime for handling out-of-range offsets. ptp_clock_adjtime
returns -ERANGE instead of clamping out-of-range offsets.

Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Vincent Cheng <vincent.cheng.xh@renesas.com>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rahul Rameshbabu 2023-06-12 14:14:58 -07:00 committed by David S. Miller
parent 67ac72a599
commit c066e74f34
2 changed files with 18 additions and 20 deletions
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36
drivers/ptp/ptp_clockmatrix.c
View File

@ -1692,14 +1692,23 @@ static int initialize_dco_operating_mode(struct idtcm_channel *channel)
/* PTP Hardware Clock interface */
/*
* Maximum absolute value for write phase offset in picoseconds
*
* @channel: channel
* @delta_ns: delta in nanoseconds
* Maximum absolute value for write phase offset in nanoseconds
*
* Destination signed register is 32-bit register in resolution of 50ps
*
* 0x7fffffff * 50 = 2147483647 * 50 = 107374182350
* 0x7fffffff * 50 = 2147483647 * 50 = 107374182350 ps
* Represent 107374182350 ps as 107374182 ns
*/
static s32 idtcm_getmaxphase(struct ptp_clock_info *ptp __always_unused)
{
return MAX_ABS_WRITE_PHASE_NANOSECONDS;
}
/*
* Internal function for implementing support for write phase offset
*
* @channel: channel
* @delta_ns: delta in nanoseconds
*/
static int _idtcm_adjphase(struct idtcm_channel *channel, s32 delta_ns)
{
@ -1708,7 +1717,6 @@ static int _idtcm_adjphase(struct idtcm_channel *channel, s32 delta_ns)
u8 i;
u8 buf[4] = {0};
s32 phase_50ps;
s64 offset_ps;
if (channel->mode != PTP_PLL_MODE_WRITE_PHASE) {
err = channel->configure_write_phase(channel);
@ -1716,19 +1724,7 @@ static int _idtcm_adjphase(struct idtcm_channel *channel, s32 delta_ns)
return err;
}
offset_ps = (s64)delta_ns * 1000;
/*
* Check for 32-bit signed max * 50:
*
* 0x7fffffff * 50 = 2147483647 * 50 = 107374182350
*/
if (offset_ps > MAX_ABS_WRITE_PHASE_PICOSECONDS)
offset_ps = MAX_ABS_WRITE_PHASE_PICOSECONDS;
else if (offset_ps < -MAX_ABS_WRITE_PHASE_PICOSECONDS)
offset_ps = -MAX_ABS_WRITE_PHASE_PICOSECONDS;
phase_50ps = div_s64(offset_ps, 50);
phase_50ps = div_s64((s64)delta_ns * 1000, 50);
for (i = 0; i < 4; i++) {
buf[i] = phase_50ps & 0xff;
@ -2048,6 +2044,7 @@ static const struct ptp_clock_info idtcm_caps = {
.n_ext_ts = MAX_TOD,
.n_pins = MAX_REF_CLK,
.adjphase = &idtcm_adjphase,
.getmaxphase = &idtcm_getmaxphase,
.adjfine = &idtcm_adjfine,
.adjtime = &idtcm_adjtime,
.gettime64 = &idtcm_gettime,
@ -2064,6 +2061,7 @@ static const struct ptp_clock_info idtcm_caps_deprecated = {
.n_ext_ts = MAX_TOD,
.n_pins = MAX_REF_CLK,
.adjphase = &idtcm_adjphase,
.getmaxphase = &idtcm_getmaxphase,
.adjfine = &idtcm_adjfine,
.adjtime = &idtcm_adjtime_deprecated,
.gettime64 = &idtcm_gettime,

2
drivers/ptp/ptp_clockmatrix.h
View File

@ -18,7 +18,7 @@
#define MAX_PLL (8)
#define MAX_REF_CLK (16)
#define MAX_ABS_WRITE_PHASE_PICOSECONDS (107374182350LL)
#define MAX_ABS_WRITE_PHASE_NANOSECONDS (107374182L)
#define TOD_MASK_ADDR (0xFFA5)
#define DEFAULT_TOD_MASK (0x04)