From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pankaj Sharma Subject: [PATCH v3] can: m_can: add support for one shot mode Date: Mon, 21 Oct 2019 17:34:40 +0530 Message-ID: <1571659480-29109-1-git-send-email-pankj.sharma@samsung.com> References: Content-Type: text/plain; charset="utf-8" Return-path: Sender: netdev-owner@vger.kernel.org To: linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: wg@grandegger.com, mkl@pengutronix.de, davem@davemloft.net, eugen.hristev@microchip.com, ludovic.desroches@microchip.com, pankaj.dubey@samsung.com, rcsekar@samsung.com, Pankaj Sharma , Sriram Dash List-Id: linux-can.vger.kernel.org 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 Signed-off-by: Sriram Dash --- changes in v3: - resolving build errors for net-next branch changes in v2: - rebase to net-next 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 562c8317e3aa..75e7490c4299 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -123,6 +123,7 @@ enum m_can_reg { #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) @@ -1135,7 +1136,7 @@ static void m_can_chip_config(struct net_device *dev) if (cdev->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)); @@ -1145,7 +1146,7 @@ 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 (cdev->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO) @@ -1165,6 +1166,10 @@ static void m_can_chip_config(struct net_device *dev) if (cdev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) cccr |= CCCR_MON; + /* Disable Auto Retransmission (all versions) */ + if (cdev->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) + cccr |= CCCR_DAR; + /* Write config */ m_can_write(cdev, M_CAN_CCCR, cccr); m_can_write(cdev, M_CAN_TEST, test); @@ -1310,7 +1315,8 @@ static int m_can_dev_setup(struct m_can_classdev *m_can_dev) m_can_dev->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 (m_can_dev->version) { -- 2.17.1