72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
// 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);
|
|
}
|