236 lines
6.0 KiB
C
236 lines
6.0 KiB
C
/*******************************************************************************
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PTP 1588 clock using the STMMAC.
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Copyright (C) 2013 Vayavya Labs Pvt Ltd
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
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*******************************************************************************/
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#include "stmmac.h"
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#include "stmmac_ptp.h"
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/**
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* stmmac_adjust_freq
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*
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* @ptp: pointer to ptp_clock_info structure
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* @ppb: desired period change in parts ber billion
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*
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* Description: this function will adjust the frequency of hardware clock.
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*/
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static int stmmac_adjust_freq(struct ptp_clock_info *ptp, s32 ppb)
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{
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struct stmmac_priv *priv =
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container_of(ptp, struct stmmac_priv, ptp_clock_ops);
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unsigned long flags;
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u32 diff, addend;
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int neg_adj = 0;
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u64 adj;
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if (ppb < 0) {
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neg_adj = 1;
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ppb = -ppb;
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}
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addend = priv->default_addend;
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adj = addend;
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adj *= ppb;
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diff = div_u64(adj, 1000000000ULL);
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addend = neg_adj ? (addend - diff) : (addend + diff);
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spin_lock_irqsave(&priv->ptp_lock, flags);
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stmmac_config_addend(priv, priv->ptpaddr, addend);
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spin_unlock_irqrestore(&priv->ptp_lock, flags);
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return 0;
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}
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/**
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* stmmac_adjust_time
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*
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* @ptp: pointer to ptp_clock_info structure
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* @delta: desired change in nanoseconds
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*
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* Description: this function will shift/adjust the hardware clock time.
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*/
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static int stmmac_adjust_time(struct ptp_clock_info *ptp, s64 delta)
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{
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struct stmmac_priv *priv =
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container_of(ptp, struct stmmac_priv, ptp_clock_ops);
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unsigned long flags;
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u32 sec, nsec;
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u32 quotient, reminder;
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int neg_adj = 0;
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bool xmac;
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xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
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if (delta < 0) {
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neg_adj = 1;
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delta = -delta;
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}
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quotient = div_u64_rem(delta, 1000000000ULL, &reminder);
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sec = quotient;
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nsec = reminder;
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spin_lock_irqsave(&priv->ptp_lock, flags);
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stmmac_adjust_systime(priv, priv->ptpaddr, sec, nsec, neg_adj, xmac);
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spin_unlock_irqrestore(&priv->ptp_lock, flags);
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return 0;
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}
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/**
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* stmmac_get_time
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*
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* @ptp: pointer to ptp_clock_info structure
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* @ts: pointer to hold time/result
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*
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* Description: this function will read the current time from the
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* hardware clock and store it in @ts.
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*/
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static int stmmac_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
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{
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struct stmmac_priv *priv =
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container_of(ptp, struct stmmac_priv, ptp_clock_ops);
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unsigned long flags;
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u64 ns = 0;
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spin_lock_irqsave(&priv->ptp_lock, flags);
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stmmac_get_systime(priv, priv->ptpaddr, &ns);
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spin_unlock_irqrestore(&priv->ptp_lock, flags);
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*ts = ns_to_timespec64(ns);
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return 0;
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}
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/**
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* stmmac_set_time
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*
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* @ptp: pointer to ptp_clock_info structure
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* @ts: time value to set
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*
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* Description: this function will set the current time on the
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* hardware clock.
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*/
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static int stmmac_set_time(struct ptp_clock_info *ptp,
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const struct timespec64 *ts)
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{
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struct stmmac_priv *priv =
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container_of(ptp, struct stmmac_priv, ptp_clock_ops);
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unsigned long flags;
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spin_lock_irqsave(&priv->ptp_lock, flags);
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stmmac_init_systime(priv, priv->ptpaddr, ts->tv_sec, ts->tv_nsec);
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spin_unlock_irqrestore(&priv->ptp_lock, flags);
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return 0;
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}
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static int stmmac_enable(struct ptp_clock_info *ptp,
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struct ptp_clock_request *rq, int on)
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{
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struct stmmac_priv *priv =
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container_of(ptp, struct stmmac_priv, ptp_clock_ops);
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struct stmmac_pps_cfg *cfg;
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int ret = -EOPNOTSUPP;
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unsigned long flags;
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switch (rq->type) {
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case PTP_CLK_REQ_PEROUT:
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cfg = &priv->pps[rq->perout.index];
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cfg->start.tv_sec = rq->perout.start.sec;
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cfg->start.tv_nsec = rq->perout.start.nsec;
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cfg->period.tv_sec = rq->perout.period.sec;
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cfg->period.tv_nsec = rq->perout.period.nsec;
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spin_lock_irqsave(&priv->ptp_lock, flags);
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ret = stmmac_flex_pps_config(priv, priv->ioaddr,
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rq->perout.index, cfg, on,
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priv->sub_second_inc,
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priv->systime_flags);
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spin_unlock_irqrestore(&priv->ptp_lock, flags);
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break;
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default:
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break;
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}
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return ret;
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}
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/* structure describing a PTP hardware clock */
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static struct ptp_clock_info stmmac_ptp_clock_ops = {
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.owner = THIS_MODULE,
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.name = "stmmac_ptp_clock",
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.max_adj = 62500000,
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.n_alarm = 0,
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.n_ext_ts = 0,
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.n_per_out = 0, /* will be overwritten in stmmac_ptp_register */
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.n_pins = 0,
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.pps = 0,
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.adjfreq = stmmac_adjust_freq,
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.adjtime = stmmac_adjust_time,
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.gettime64 = stmmac_get_time,
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.settime64 = stmmac_set_time,
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.enable = stmmac_enable,
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};
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/**
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* stmmac_ptp_register
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* @priv: driver private structure
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* Description: this function will register the ptp clock driver
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* to kernel. It also does some house keeping work.
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*/
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void stmmac_ptp_register(struct stmmac_priv *priv)
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{
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int i;
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for (i = 0; i < priv->dma_cap.pps_out_num; i++) {
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if (i >= STMMAC_PPS_MAX)
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break;
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priv->pps[i].available = true;
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}
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stmmac_ptp_clock_ops.n_per_out = priv->dma_cap.pps_out_num;
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spin_lock_init(&priv->ptp_lock);
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priv->ptp_clock_ops = stmmac_ptp_clock_ops;
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priv->ptp_clock = ptp_clock_register(&priv->ptp_clock_ops,
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priv->device);
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if (IS_ERR(priv->ptp_clock)) {
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netdev_err(priv->dev, "ptp_clock_register failed\n");
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priv->ptp_clock = NULL;
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} else if (priv->ptp_clock)
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netdev_info(priv->dev, "registered PTP clock\n");
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}
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/**
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* stmmac_ptp_unregister
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* @priv: driver private structure
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* Description: this function will remove/unregister the ptp clock driver
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* from the kernel.
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*/
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void stmmac_ptp_unregister(struct stmmac_priv *priv)
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{
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if (priv->ptp_clock) {
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ptp_clock_unregister(priv->ptp_clock);
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priv->ptp_clock = NULL;
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pr_debug("Removed PTP HW clock successfully on %s\n",
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priv->dev->name);
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}
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}
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