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