linux/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 291 Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details the full gnu general public license is included in this distribution in the file called copying this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope [that] it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details the full gnu general public license is included in this distribution in the file called copying extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 57 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.515993066@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-29 22:18:05 +08:00
// 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;
}
if (priv->plat->ptp_max_adj)
stmmac_ptp_clock_ops.max_adj = priv->plat->ptp_max_adj;
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);
}
}