提交 dcf9e152 编写于 作者: N Nikita Edward Baruzdin 提交者: Marc Kleine-Budde

can: sja1000: Add support for CAN_CTRLMODE_LOOPBACK

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: NNikita Edward Baruzdin <nebaruzdin@gmail.com>
Acked-by: NOliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
上级 4b9e1bab
无相关合并请求
......@@ -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);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册
反馈
建议
客服 返回
顶部