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can: sja1000: Add support for listen-only mode and one-shot mode

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One-shot mode uses the TCS bit of the status register to discern
whether a transmission was successful or not. On a failed
transmission, the frame is not echoed back.

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Andreas Larsson 2012-09-20 09:50:41 +02:00 committed by David S. Miller
parent f61bd0585d
commit 7146b2d9f1
1 changed files with 24 additions and 7 deletions
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31
drivers/net/can/sja1000/sja1000.c
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@ -156,8 +156,13 @@ static void set_normal_mode(struct net_device *dev)
}
/* set chip to normal mode */
priv->write_reg(priv, REG_MOD, 0x00);
if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
priv->write_reg(priv, REG_MOD, MOD_LOM);
else
priv->write_reg(priv, REG_MOD, 0x00);
udelay(10);
status = priv->read_reg(priv, REG_MOD);
}
@ -310,7 +315,10 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
can_put_echo_skb(skb, dev, 0);
sja1000_write_cmdreg(priv, CMD_TR);
if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
else
sja1000_write_cmdreg(priv, CMD_TR);
return NETDEV_TX_OK;
}
@ -505,10 +513,18 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
netdev_warn(dev, "wakeup interrupt\n");
if (isrc & IRQ_TI) {
/* transmission complete interrupt */
stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
stats->tx_packets++;
can_get_echo_skb(dev, 0);
/* transmission buffer released */
if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
!(status & SR_TCS)) {
stats->tx_errors++;
can_free_echo_skb(dev, 0);
} else {
/* transmission complete */
stats->tx_bytes +=
priv->read_reg(priv, REG_FI) & 0xf;
stats->tx_packets++;
can_get_echo_skb(dev, 0);
}
netif_wake_queue(dev);
}
if (isrc & IRQ_RI) {
@ -605,7 +621,8 @@ struct net_device *alloc_sja1000dev(int sizeof_priv)
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_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_ONE_SHOT;
spin_lock_init(&priv->cmdreg_lock);