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// SPDX-License-Identifier: GPL-2.0
//
// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
//
// Copyright (c) 2021 Pengutronix,
// Marc Kleine-Budde <kernel@pengutronix.de>
//
#include <linux/clocksource.h>
#include <linux/workqueue.h>
#include "mcp251xfd.h"
static u64 mcp251xfd_timestamp_read(const struct cyclecounter *cc)
{
const struct mcp251xfd_priv *priv;
u32 timestamp = 0;
int err;
priv = container_of(cc, struct mcp251xfd_priv, cc);
err = mcp251xfd_get_timestamp(priv, ×tamp);
if (err)
netdev_err(priv->ndev,
"Error %d while reading timestamp. HW timestamps may be inaccurate.",
err);
return timestamp;
}
static void mcp251xfd_timestamp_work(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct mcp251xfd_priv *priv;
priv = container_of(delayed_work, struct mcp251xfd_priv, timestamp);
timecounter_read(&priv->tc);
schedule_delayed_work(&priv->timestamp,
MCP251XFD_TIMESTAMP_WORK_DELAY_SEC * HZ);
}
void mcp251xfd_skb_set_timestamp(const struct mcp251xfd_priv *priv,
struct sk_buff *skb, u32 timestamp)
{
struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
u64 ns;
ns = timecounter_cyc2time(&priv->tc, timestamp);
hwtstamps->hwtstamp = ns_to_ktime(ns);
}
void mcp251xfd_timestamp_init(struct mcp251xfd_priv *priv)
{
struct cyclecounter *cc = &priv->cc;
cc->read = mcp251xfd_timestamp_read;
cc->mask = CYCLECOUNTER_MASK(32);
cc->shift = 1;
cc->mult = clocksource_hz2mult(priv->can.clock.freq, cc->shift);
timecounter_init(&priv->tc, &priv->cc, ktime_get_real_ns());
INIT_DELAYED_WORK(&priv->timestamp, mcp251xfd_timestamp_work);
schedule_delayed_work(&priv->timestamp,
MCP251XFD_TIMESTAMP_WORK_DELAY_SEC * HZ);
}
void mcp251xfd_timestamp_stop(struct mcp251xfd_priv *priv)
{
cancel_delayed_work_sync(&priv->timestamp);
}
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