This is a preparation patch to convert the driver to make use of the
rx-offload helper. With rx-offload the received CAN frames are sorted
by their timestamp. Regular CAN RX'ed and TX'ed CAN frames are
timestamped by the hardware. Error events are not.
Introduce a new function at91_alloc_can_err_skb() the allocates an
error SKB and reads the current timestamp from the controller.
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
drivers/net/can/at91_can.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index d5e1d1b2cdd1..ca62aa027e5f 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -576,6 +576,22 @@ static inline void at91_activate_rx_mb(const struct at91_priv *priv,
at91_write(priv, AT91_TCR, mask);
}
+static inline u32 at91_get_timestamp(const struct at91_priv *priv)
+{
+ return at91_read(priv, AT91_TIM);
+}
+
+static inline struct sk_buff *
+at91_alloc_can_err_skb(struct net_device *dev,
+ struct can_frame **cf, u32 *timestamp)
+{
+ const struct at91_priv *priv = netdev_priv(dev);
+
+ *timestamp = at91_get_timestamp(priv);
+
+ return alloc_can_err_skb(dev, cf);
+}
+
/**
* at91_rx_overflow_err - send error frame due to rx overflow
* @dev: net device
--
2.40.1
