Contributors: 17
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Rayagond Kokatanur |
577 |
37.81% |
1 |
3.70% |
| Xiaoliang Yang |
311 |
20.38% |
2 |
7.41% |
| Tan, Tee Min |
257 |
16.84% |
2 |
7.41% |
| Jose Abreu |
245 |
16.06% |
3 |
11.11% |
| Kurt Kanzenbach |
41 |
2.69% |
1 |
3.70% |
| Giuseppe Cavallaro |
26 |
1.70% |
5 |
18.52% |
| Weifeng Voon |
18 |
1.18% |
1 |
3.70% |
| Jacob E Keller |
13 |
0.85% |
1 |
3.70% |
| Richard Cochran |
11 |
0.72% |
3 |
11.11% |
| Yannick Vignon |
11 |
0.72% |
1 |
3.70% |
| Dan Carpenter |
4 |
0.26% |
1 |
3.70% |
| Wong Vee Khee |
3 |
0.20% |
1 |
3.70% |
| Vince Bridgers |
2 |
0.13% |
1 |
3.70% |
| Nico Pitre |
2 |
0.13% |
1 |
3.70% |
| Thomas Gleixner |
2 |
0.13% |
1 |
3.70% |
| Nathan Chancellor |
2 |
0.13% |
1 |
3.70% |
| Antonio Borneo |
1 |
0.07% |
1 |
3.70% |
| Total |
1526 |
|
27 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
PTP 1588 clock using the STMMAC.
Copyright (C) 2013 Vayavya Labs Pvt Ltd
Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
*******************************************************************************/
#include "stmmac.h"
#include "stmmac_ptp.h"
#include "dwmac4.h"
/**
* stmmac_adjust_freq
*
* @ptp: pointer to ptp_clock_info structure
* @ppb: desired period change in parts ber billion
*
* Description: this function will adjust the frequency of hardware clock.
*/
static int stmmac_adjust_freq(struct ptp_clock_info *ptp, s32 ppb)
{
struct stmmac_priv *priv =
container_of(ptp, struct stmmac_priv, ptp_clock_ops);
unsigned long flags;
u32 diff, addend;
int neg_adj = 0;
u64 adj;
if (ppb < 0) {
neg_adj = 1;
ppb = -ppb;
}
addend = priv->default_addend;
adj = addend;
adj *= ppb;
diff = div_u64(adj, 1000000000ULL);
addend = neg_adj ? (addend - diff) : (addend + diff);
write_lock_irqsave(&priv->ptp_lock, flags);
stmmac_config_addend(priv, priv->ptpaddr, addend);
write_unlock_irqrestore(&priv->ptp_lock, flags);
return 0;
}
/**
* stmmac_adjust_time
*
* @ptp: pointer to ptp_clock_info structure
* @delta: desired change in nanoseconds
*
* Description: this function will shift/adjust the hardware clock time.
*/
static int stmmac_adjust_time(struct ptp_clock_info *ptp, s64 delta)
{
struct stmmac_priv *priv =
container_of(ptp, struct stmmac_priv, ptp_clock_ops);
unsigned long flags;
u32 sec, nsec;
u32 quotient, reminder;
int neg_adj = 0;
bool xmac, est_rst = false;
int ret;
xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
if (delta < 0) {
neg_adj = 1;
delta = -delta;
}
quotient = div_u64_rem(delta, 1000000000ULL, &reminder);
sec = quotient;
nsec = reminder;
/* If EST is enabled, disabled it before adjust ptp time. */
if (priv->plat->est && priv->plat->est->enable) {
est_rst = true;
mutex_lock(&priv->plat->est->lock);
priv->plat->est->enable = false;
stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
priv->plat->clk_ptp_rate);
mutex_unlock(&priv->plat->est->lock);
}
write_lock_irqsave(&priv->ptp_lock, flags);
stmmac_adjust_systime(priv, priv->ptpaddr, sec, nsec, neg_adj, xmac);
write_unlock_irqrestore(&priv->ptp_lock, flags);
/* Caculate new basetime and re-configured EST after PTP time adjust. */
if (est_rst) {
struct timespec64 current_time, time;
ktime_t current_time_ns, basetime;
u64 cycle_time;
mutex_lock(&priv->plat->est->lock);
priv->ptp_clock_ops.gettime64(&priv->ptp_clock_ops, ¤t_time);
current_time_ns = timespec64_to_ktime(current_time);
time.tv_nsec = priv->plat->est->btr_reserve[0];
time.tv_sec = priv->plat->est->btr_reserve[1];
basetime = timespec64_to_ktime(time);
cycle_time = (u64)priv->plat->est->ctr[1] * NSEC_PER_SEC +
priv->plat->est->ctr[0];
time = stmmac_calc_tas_basetime(basetime,
current_time_ns,
cycle_time);
priv->plat->est->btr[0] = (u32)time.tv_nsec;
priv->plat->est->btr[1] = (u32)time.tv_sec;
priv->plat->est->enable = true;
ret = stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
priv->plat->clk_ptp_rate);
mutex_unlock(&priv->plat->est->lock);
if (ret)
netdev_err(priv->dev, "failed to configure EST\n");
}
return 0;
}
/**
* stmmac_get_time
*
* @ptp: pointer to ptp_clock_info structure
* @ts: pointer to hold time/result
*
* Description: this function will read the current time from the
* hardware clock and store it in @ts.
*/
static int stmmac_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
struct stmmac_priv *priv =
container_of(ptp, struct stmmac_priv, ptp_clock_ops);
unsigned long flags;
u64 ns = 0;
read_lock_irqsave(&priv->ptp_lock, flags);
stmmac_get_systime(priv, priv->ptpaddr, &ns);
read_unlock_irqrestore(&priv->ptp_lock, flags);
*ts = ns_to_timespec64(ns);
return 0;
}
/**
* stmmac_set_time
*
* @ptp: pointer to ptp_clock_info structure
* @ts: time value to set
*
* Description: this function will set the current time on the
* hardware clock.
*/
static int stmmac_set_time(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct stmmac_priv *priv =
container_of(ptp, struct stmmac_priv, ptp_clock_ops);
unsigned long flags;
write_lock_irqsave(&priv->ptp_lock, flags);
stmmac_init_systime(priv, priv->ptpaddr, ts->tv_sec, ts->tv_nsec);
write_unlock_irqrestore(&priv->ptp_lock, flags);
return 0;
}
static int stmmac_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct stmmac_priv *priv =
container_of(ptp, struct stmmac_priv, ptp_clock_ops);
void __iomem *ptpaddr = priv->ptpaddr;
struct stmmac_pps_cfg *cfg;
int ret = -EOPNOTSUPP;
unsigned long flags;
u32 acr_value;
switch (rq->type) {
case PTP_CLK_REQ_PEROUT:
/* Reject requests with unsupported flags */
if (rq->perout.flags)
return -EOPNOTSUPP;
cfg = &priv->pps[rq->perout.index];
cfg->start.tv_sec = rq->perout.start.sec;
cfg->start.tv_nsec = rq->perout.start.nsec;
cfg->period.tv_sec = rq->perout.period.sec;
cfg->period.tv_nsec = rq->perout.period.nsec;
write_lock_irqsave(&priv->ptp_lock, flags);
ret = stmmac_flex_pps_config(priv, priv->ioaddr,
rq->perout.index, cfg, on,
priv->sub_second_inc,
priv->systime_flags);
write_unlock_irqrestore(&priv->ptp_lock, flags);
break;
case PTP_CLK_REQ_EXTTS:
priv->plat->ext_snapshot_en = on;
mutex_lock(&priv->aux_ts_lock);
acr_value = readl(ptpaddr + PTP_ACR);
acr_value &= ~PTP_ACR_MASK;
if (on) {
/* Enable External snapshot trigger */
acr_value |= priv->plat->ext_snapshot_num;
acr_value |= PTP_ACR_ATSFC;
netdev_dbg(priv->dev, "Auxiliary Snapshot %d enabled.\n",
priv->plat->ext_snapshot_num >>
PTP_ACR_ATSEN_SHIFT);
} else {
netdev_dbg(priv->dev, "Auxiliary Snapshot %d disabled.\n",
priv->plat->ext_snapshot_num >>
PTP_ACR_ATSEN_SHIFT);
}
writel(acr_value, ptpaddr + PTP_ACR);
mutex_unlock(&priv->aux_ts_lock);
ret = 0;
break;
default:
break;
}
return ret;
}
/**
* stmmac_get_syncdevicetime
* @device: current device time
* @system: system counter value read synchronously with device time
* @ctx: context provided by timekeeping code
* Description: Read device and system clock simultaneously and return the
* corrected clock values in ns.
**/
static int stmmac_get_syncdevicetime(ktime_t *device,
struct system_counterval_t *system,
void *ctx)
{
struct stmmac_priv *priv = (struct stmmac_priv *)ctx;
if (priv->plat->crosststamp)
return priv->plat->crosststamp(device, system, ctx);
else
return -EOPNOTSUPP;
}
static int stmmac_getcrosststamp(struct ptp_clock_info *ptp,
struct system_device_crosststamp *xtstamp)
{
struct stmmac_priv *priv =
container_of(ptp, struct stmmac_priv, ptp_clock_ops);
return get_device_system_crosststamp(stmmac_get_syncdevicetime,
priv, NULL, xtstamp);
}
/* structure describing a PTP hardware clock */
static struct ptp_clock_info stmmac_ptp_clock_ops = {
.owner = THIS_MODULE,
.name = "stmmac ptp",
.max_adj = 62500000,
.n_alarm = 0,
.n_ext_ts = 0, /* will be overwritten in stmmac_ptp_register */
.n_per_out = 0, /* will be overwritten in stmmac_ptp_register */
.n_pins = 0,
.pps = 0,
.adjfreq = stmmac_adjust_freq,
.adjtime = stmmac_adjust_time,
.gettime64 = stmmac_get_time,
.settime64 = stmmac_set_time,
.enable = stmmac_enable,
.getcrosststamp = stmmac_getcrosststamp,
};
/**
* stmmac_ptp_register
* @priv: driver private structure
* Description: this function will register the ptp clock driver
* to kernel. It also does some house keeping work.
*/
void stmmac_ptp_register(struct stmmac_priv *priv)
{
int i;
for (i = 0; i < priv->dma_cap.pps_out_num; i++) {
if (i >= STMMAC_PPS_MAX)
break;
priv->pps[i].available = true;
}
if (priv->plat->ptp_max_adj)
stmmac_ptp_clock_ops.max_adj = priv->plat->ptp_max_adj;
/* Calculate the clock domain crossing (CDC) error if necessary */
priv->plat->cdc_error_adj = 0;
if (priv->plat->has_gmac4 && priv->plat->clk_ptp_rate)
priv->plat->cdc_error_adj = (2 * NSEC_PER_SEC) / priv->plat->clk_ptp_rate;
stmmac_ptp_clock_ops.n_per_out = priv->dma_cap.pps_out_num;
stmmac_ptp_clock_ops.n_ext_ts = priv->dma_cap.aux_snapshot_n;
rwlock_init(&priv->ptp_lock);
mutex_init(&priv->aux_ts_lock);
priv->ptp_clock_ops = stmmac_ptp_clock_ops;
priv->ptp_clock = ptp_clock_register(&priv->ptp_clock_ops,
priv->device);
if (IS_ERR(priv->ptp_clock)) {
netdev_err(priv->dev, "ptp_clock_register failed\n");
priv->ptp_clock = NULL;
} else if (priv->ptp_clock)
netdev_info(priv->dev, "registered PTP clock\n");
}
/**
* stmmac_ptp_unregister
* @priv: driver private structure
* Description: this function will remove/unregister the ptp clock driver
* from the kernel.
*/
void stmmac_ptp_unregister(struct stmmac_priv *priv)
{
if (priv->ptp_clock) {
ptp_clock_unregister(priv->ptp_clock);
priv->ptp_clock = NULL;
pr_debug("Removed PTP HW clock successfully on %s\n",
priv->dev->name);
}
mutex_destroy(&priv->aux_ts_lock);
}