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// 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"
/**
* 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);
spin_lock_irqsave(&priv->ptp_lock, flags);
stmmac_config_addend(priv, priv->ptpaddr, addend);
spin_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;
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;
spin_lock_irqsave(&priv->ptp_lock, flags);
stmmac_adjust_systime(priv, priv->ptpaddr, sec, nsec, neg_adj, xmac);
spin_unlock_irqrestore(&priv->ptp_lock, flags);
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;
spin_lock_irqsave(&priv->ptp_lock, flags);
stmmac_get_systime(priv, priv->ptpaddr, &ns);
spin_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;
spin_lock_irqsave(&priv->ptp_lock, flags);
stmmac_init_systime(priv, priv->ptpaddr, ts->tv_sec, ts->tv_nsec);
spin_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);
struct stmmac_pps_cfg *cfg;
int ret = -EOPNOTSUPP;
unsigned long flags;
switch (rq->type) {
case PTP_CLK_REQ_PEROUT:
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;
spin_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);
spin_unlock_irqrestore(&priv->ptp_lock, flags);
break;
default:
break;
}
return ret;
}
/* structure describing a PTP hardware clock */
static struct ptp_clock_info stmmac_ptp_clock_ops = {
.owner = THIS_MODULE,
.name = "stmmac_ptp_clock",
.max_adj = 62500000,
.n_alarm = 0,
.n_ext_ts = 0,
.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,
};
/**
* 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;
}
stmmac_ptp_clock_ops.n_per_out = priv->dma_cap.pps_out_num;
spin_lock_init(&priv->ptp_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);
}
}
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