[PATCH] can: m_can: add support for one shot mode

[Pankaj Sharma]

According to the CAN Specification (see ISO 11898-1:2015, 8.3.4
Recovery Management), the M_CAN provides means for automatic
retransmission of frames that have lost arbitration or that
have been disturbed by errors during transmission. By default
automatic retransmission is enabled.

The Bosch MCAN controller has support for disabling automatic
retransmission.

To support time-triggered communication as described in ISO
11898-1:2015, chapter 9.2, the automatic retransmission may be
disabled via CCCR.DAR.

CAN_CTRLMODE_ONE_SHOT is used for disabling automatic retransmission.

Signed-off-by: Pankaj Sharma <pankj.sharma@xxxxxxxxxxx>
Signed-off-by: Sriram Dash <sriram.dash@xxxxxxxxxxx>
---
 drivers/net/can/m_can/m_can.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index deb274a19ba0..e7165404ba8a 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -150,6 +150,7 @@ enum m_can_mram_cfg {
 #define CCCR_CME_CANFD_BRS	0x2
 #define CCCR_TXP		BIT(14)
 #define CCCR_TEST		BIT(7)
+#define CCCR_DAR		BIT(6)
 #define CCCR_MON		BIT(5)
 #define CCCR_CSR		BIT(4)
 #define CCCR_CSA		BIT(3)
@@ -1123,7 +1124,7 @@ static void m_can_chip_config(struct net_device *dev)
 	if (priv->version == 30) {
 	/* Version 3.0.x */
 
-		cccr &= ~(CCCR_TEST | CCCR_MON |
+		cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_DAR |
 			(CCCR_CMR_MASK << CCCR_CMR_SHIFT) |
 			(CCCR_CME_MASK << CCCR_CME_SHIFT));
 
@@ -1133,7 +1134,7 @@ static void m_can_chip_config(struct net_device *dev)
 	} else {
 	/* Version 3.1.x or 3.2.x */
 		cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_BRSE | CCCR_FDOE |
-			  CCCR_NISO);
+			  CCCR_NISO | CCCR_DAR);
 
 		/* Only 3.2.x has NISO Bit implemented */
 		if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
@@ -1153,6 +1154,10 @@ static void m_can_chip_config(struct net_device *dev)
 	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 		cccr |= CCCR_MON;
 
+	/* Disable Auto Retransmission (all versions) */
+	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
+		cccr |= CCCR_DAR;
+
 	/* Write config */
 	m_can_write(priv, M_CAN_CCCR, cccr);
 	m_can_write(priv, M_CAN_TEST, test);
@@ -1291,7 +1296,8 @@ static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
 	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
 					CAN_CTRLMODE_LISTENONLY |
 					CAN_CTRLMODE_BERR_REPORTING |
-					CAN_CTRLMODE_FD;
+					CAN_CTRLMODE_FD |
+					CAN_CTRLMODE_ONE_SHOT;
 
 	/* Set properties depending on M_CAN version */
 	switch (priv->version) {
-- 
2.17.1