can: sja1000: Add support for listen-only mode and one-shot mode
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>
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 4c4f33d..25011db 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -156,8 +156,13 @@
}
/* 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 @@
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 @@
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 @@
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);