From 9e37bc6c635a85e0ae3067f19d6f84e1c4516a6c Mon Sep 17 00:00:00 2001 From: Mirza Krak Date: Fri, 8 Aug 2014 14:30:50 +0200 Subject: can: sja1000: Validate initialization state in start method When sja1000 is not compiled as module the SJA1000 chip is only initialized during device registration on kernel boot. Should the chip get a hardware reset there is no way to reinitialize it without re- booting the Linux kernel. This patch adds a check in sja1000_start if the chip is initialized, if not we initialize it. Signed-off-by: Mirza Krak Signed-off-by: Marc Kleine-Budde --- drivers/net/can/sja1000/sja1000.c | 62 +++++++++++++++++++++------------------ 1 file changed, 33 insertions(+), 29 deletions(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c index d1692154ed1b..b27ac6074afb 100644 --- a/drivers/net/can/sja1000/sja1000.c +++ b/drivers/net/can/sja1000/sja1000.c @@ -172,6 +172,35 @@ static void set_normal_mode(struct net_device *dev) netdev_err(dev, "setting SJA1000 into normal mode failed!\n"); } +/* + * initialize SJA1000 chip: + * - reset chip + * - set output mode + * - set baudrate + * - enable interrupts + * - start operating mode + */ +static void chipset_init(struct net_device *dev) +{ + struct sja1000_priv *priv = netdev_priv(dev); + + /* set clock divider and output control register */ + priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); + + /* set acceptance filter (accept all) */ + priv->write_reg(priv, SJA1000_ACCC0, 0x00); + priv->write_reg(priv, SJA1000_ACCC1, 0x00); + priv->write_reg(priv, SJA1000_ACCC2, 0x00); + priv->write_reg(priv, SJA1000_ACCC3, 0x00); + + priv->write_reg(priv, SJA1000_ACCM0, 0xFF); + priv->write_reg(priv, SJA1000_ACCM1, 0xFF); + priv->write_reg(priv, SJA1000_ACCM2, 0xFF); + priv->write_reg(priv, SJA1000_ACCM3, 0xFF); + + priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); +} + static void sja1000_start(struct net_device *dev) { struct sja1000_priv *priv = netdev_priv(dev); @@ -180,6 +209,10 @@ static void sja1000_start(struct net_device *dev) if (priv->can.state != CAN_STATE_STOPPED) set_reset_mode(dev); + /* Initialize chip if uninitialized at this stage */ + if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN)) + chipset_init(dev); + /* Clear error counters and error code capture */ priv->write_reg(priv, SJA1000_TXERR, 0x0); priv->write_reg(priv, SJA1000_RXERR, 0x0); @@ -236,35 +269,6 @@ static int sja1000_get_berr_counter(const struct net_device *dev, return 0; } -/* - * initialize SJA1000 chip: - * - reset chip - * - set output mode - * - set baudrate - * - enable interrupts - * - start operating mode - */ -static void chipset_init(struct net_device *dev) -{ - struct sja1000_priv *priv = netdev_priv(dev); - - /* set clock divider and output control register */ - priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); - - /* set acceptance filter (accept all) */ - priv->write_reg(priv, SJA1000_ACCC0, 0x00); - priv->write_reg(priv, SJA1000_ACCC1, 0x00); - priv->write_reg(priv, SJA1000_ACCC2, 0x00); - priv->write_reg(priv, SJA1000_ACCC3, 0x00); - - priv->write_reg(priv, SJA1000_ACCM0, 0xFF); - priv->write_reg(priv, SJA1000_ACCM1, 0xFF); - priv->write_reg(priv, SJA1000_ACCM2, 0xFF); - priv->write_reg(priv, SJA1000_ACCM3, 0xFF); - - priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); -} - /* * transmit a CAN message * message layout in the sk_buff should be like this: -- cgit v1.2.3 From 37b75a3aa8ec7031df75219fe2f8e5e9b7be398f Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 1 Aug 2014 11:53:44 +0300 Subject: can: c_can: checking IS_ERR() instead of NULL devm_ioremap() returns NULL on error, not an ERR_PTR(). Fixes: 33cf75656923 ('can: c_can_platform: Fix raminit, use devm_ioremap() instead of devm_ioremap_resource()') Signed-off-by: Dan Carpenter Cc: linux-stable # >= v3.11 Signed-off-by: Marc Kleine-Budde --- drivers/net/can/c_can/c_can_platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/can') diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index 5dede6e64376..109cb44291f5 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -280,7 +280,7 @@ static int c_can_plat_probe(struct platform_device *pdev) priv->raminit_ctrlreg = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (IS_ERR(priv->raminit_ctrlreg) || priv->instance < 0) + if (!priv->raminit_ctrlreg || priv->instance < 0) dev_info(&pdev->dev, "control memory is not used for raminit\n"); else priv->raminit = c_can_hw_raminit_ti; -- cgit v1.2.3 From bc03a54139baafcd8fe89ad115411c2c9c8a4905 Mon Sep 17 00:00:00 2001 From: Alexander Stein Date: Tue, 12 Aug 2014 10:47:21 +0200 Subject: can: flexcan: Disable error interrupt when bus error reporting is disabled In case we don't have FLEXCAN_HAS_BROKEN_ERR_STATE and the user set CAN_CTRLMODE_BERR_REPORTING once it can not be unset again until reboot. So in case neither hardware nor user wants the error interrupt disable the bit. Signed-off-by: Alexander Stein Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index f425ec2c7839..a691651f9ad9 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -852,6 +852,8 @@ static int flexcan_chip_start(struct net_device *dev) if (priv->devtype_data->features & FLEXCAN_HAS_BROKEN_ERR_STATE || priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; + else + reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK; /* save for later use */ priv->reg_ctrl_default = reg_ctrl; -- cgit v1.2.3 From 8ce261d0bb491da957278cdcba207791f329d1da Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 25 Jul 2014 20:16:40 +0200 Subject: can: flexcan: handle state passive -> warning transition Once the CAN-bus is open and a packet is sent, the controller switches into the PASSIVE state. Once the BUS is closed again it goes the back err-warning. The TX error counter goes 0 -> 0x80 -> 0x7f. This patch makes sure that the user learns about this state chang (CAN_STATE_ERROR_WARNING => CAN_STATE_ERROR_PASSIVE) Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Matthias Klein Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/net/can') diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index a691651f9ad9..944aa5d3af6e 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -549,6 +549,13 @@ static void do_state(struct net_device *dev, /* process state changes depending on the new state */ switch (new_state) { + case CAN_STATE_ERROR_WARNING: + netdev_dbg(dev, "Error Warning\n"); + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = (bec.txerr > bec.rxerr) ? + CAN_ERR_CRTL_TX_WARNING : + CAN_ERR_CRTL_RX_WARNING; + break; case CAN_STATE_ERROR_ACTIVE: netdev_dbg(dev, "Error Active\n"); cf->can_id |= CAN_ERR_PROT; -- cgit v1.2.3