From 7146b2d9f11e07848050f53b71bafa37a95ae609 Mon Sep 17 00:00:00 2001 From: Andreas Larsson Date: Thu, 20 Sep 2012 09:50:41 +0200 Subject: [PATCH] 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 Acked-by: Wolfgang Grandegger Acked-by: Oliver Hartkopp Signed-off-by: Marc Kleine-Budde --- drivers/net/can/sja1000/sja1000.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c index 4c4f33d482d2..25011dbe1b96 100644 --- a/drivers/net/can/sja1000/sja1000.c +++ b/drivers/net/can/sja1000/sja1000.c @@ -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); -- 2.20.1