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can: sja1000: Add support for CAN_CTRLMODE_LOOPBACK

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This adds support for hardware loopback in SJA1000 by utilising its self
reception request (SRR) feature. Upon SRR the message is transmitted and
received simultaneously, meaning you can't have hardware loopback
without actually sending a message to the CAN bus in case of SJA1000.

Signed-off-by: Nikita Edward Baruzdin <nebaruzdin@gmail.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Nikita Edward Baruzdin 2014-07-11 16:13:20 +04:00 committed by Marc Kleine-Budde
parent 4b9e1bab12
commit dcf9e15267
1 changed files with 13 additions and 5 deletions
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18
drivers/net/can/sja1000/sja1000.c
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@ -278,6 +278,7 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
uint8_t dlc;
canid_t id;
uint8_t dreg;
u8 cmd_reg_val = 0x00;
int i;
if (can_dropped_invalid_skb(dev, skb))
@ -312,9 +313,14 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
can_put_echo_skb(skb, dev, 0);
if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
cmd_reg_val |= CMD_AT;
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
cmd_reg_val |= CMD_SRR;
else
sja1000_write_cmdreg(priv, CMD_TR);
cmd_reg_val |= CMD_TR;
sja1000_write_cmdreg(priv, cmd_reg_val);
return NETDEV_TX_OK;
}
@ -622,9 +628,11 @@ struct net_device *alloc_sja1000dev(int sizeof_priv)
priv->can.do_set_bittiming = sja1000_set_bittiming;
priv->can.do_set_mode = sja1000_set_mode;
priv->can.do_get_berr_counter = sja1000_get_berr_counter;
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_ONE_SHOT;
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_3_SAMPLES |
CAN_CTRLMODE_ONE_SHOT |
CAN_CTRLMODE_BERR_REPORTING;
spin_lock_init(&priv->cmdreg_lock);