Merge tag 'linux-can-fixes-for-6.4-20230515' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2023-05-15

The first 2 patches are by Oliver Hartkopp and allow the
MSG_CMSG_COMPAT flag for isotp and j1939.

The next patch is by Oliver Hartkopp, too and adds missing CAN XL
support in can_put_echo_skb().

Geert Uytterhoeven's patch let's the bxcan driver depend on
ARCH_STM32.

The last 5 patches are from Dario Binacchi and also affect the bxcan
driver. The bxcan driver hit mainline with v6.4-rc1 and was originally
written for IP cores containing 2 CAN interfaces with shared
resources. Dario's series updates the DT bindings and driver to
support IP cores with a single CAN interface instance as well as
adding the bxcan to the stm32f746's device tree.

* tag 'linux-can-fixes-for-6.4-20230515' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can:
  ARM: dts: stm32: add CAN support on stm32f746
  can: bxcan: add support for single peripheral configuration
  ARM: dts: stm32: add pin map for CAN controller on stm32f7
  ARM: dts: stm32f429: put can2 in secondary mode
  dt-bindings: net: can: add "st,can-secondary" property
  can: CAN_BXCAN should depend on ARCH_STM32
  can: dev: fix missing CAN XL support in can_put_echo_skb()
  can: j1939: recvmsg(): allow MSG_CMSG_COMPAT flag
  can: isotp: recvmsg(): allow MSG_CMSG_COMPAT flag
====================

Link: https://lore.kernel.org/r/20230515204722.1000957-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 26 insertions, 13 deletions

diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index 3ceccafd701b..b190007c01be 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -95,7 +95,7 @@ config CAN_AT91
 
 config CAN_BXCAN
 	tristate "STM32 Basic Extended CAN (bxCAN) devices"
-	depends on OF || ARCH_STM32 || COMPILE_TEST
+	depends on ARCH_STM32 || COMPILE_TEST
 	depends on HAS_IOMEM
 	select CAN_RX_OFFLOAD
 	help
diff --git a/drivers/net/can/bxcan.c b/drivers/net/can/bxcan.c
index e26ccd41e3cb..027a8a162fe4 100644
--- a/drivers/net/can/bxcan.c
+++ b/drivers/net/can/bxcan.c
@@ -118,7 +118,7 @@
 #define BXCAN_FiR1_REG(b) (0x40 + (b) * 8)
 #define BXCAN_FiR2_REG(b) (0x44 + (b) * 8)
 
-#define BXCAN_FILTER_ID(primary) (primary ? 0 : 14)
+#define BXCAN_FILTER_ID(cfg) ((cfg) == BXCAN_CFG_DUAL_SECONDARY ? 14 : 0)
 
 /* Filter primary register (FMR) bits */
 #define BXCAN_FMR_CANSB_MASK GENMASK(13, 8)
@@ -135,6 +135,12 @@ enum bxcan_lec_code {
 	BXCAN_LEC_UNUSED
 };
 
+enum bxcan_cfg {
+	BXCAN_CFG_SINGLE = 0,
+	BXCAN_CFG_DUAL_PRIMARY,
+	BXCAN_CFG_DUAL_SECONDARY
+};
+
 /* Structure of the message buffer */
 struct bxcan_mb {
 	u32 id;			/* can identifier */
@@ -167,7 +173,7 @@ struct bxcan_priv {
 	struct regmap *gcan;
 	int tx_irq;
 	int sce_irq;
-	bool primary;
+	enum bxcan_cfg cfg;
 	struct clk *clk;
 	spinlock_t rmw_lock;	/* lock for read-modify-write operations */
 	unsigned int tx_head;
@@ -202,17 +208,17 @@ static inline void bxcan_rmw(struct bxcan_priv *priv, void __iomem *addr,
 	spin_unlock_irqrestore(&priv->rmw_lock, flags);
 }
 
-static void bxcan_disable_filters(struct bxcan_priv *priv, bool primary)
+static void bxcan_disable_filters(struct bxcan_priv *priv, enum bxcan_cfg cfg)
 {
-	unsigned int fid = BXCAN_FILTER_ID(primary);
+	unsigned int fid = BXCAN_FILTER_ID(cfg);
 	u32 fmask = BIT(fid);
 
 	regmap_update_bits(priv->gcan, BXCAN_FA1R_REG, fmask, 0);
 }
 
-static void bxcan_enable_filters(struct bxcan_priv *priv, bool primary)
+static void bxcan_enable_filters(struct bxcan_priv *priv, enum bxcan_cfg cfg)
 {
-	unsigned int fid = BXCAN_FILTER_ID(primary);
+	unsigned int fid = BXCAN_FILTER_ID(cfg);
 	u32 fmask = BIT(fid);
 
 	/* Filter settings:
@@ -680,7 +686,7 @@ static int bxcan_chip_start(struct net_device *ndev)
 		  BXCAN_BTR_BRP_MASK | BXCAN_BTR_TS1_MASK | BXCAN_BTR_TS2_MASK |
 		  BXCAN_BTR_SJW_MASK, set);
 
-	bxcan_enable_filters(priv, priv->primary);
+	bxcan_enable_filters(priv, priv->cfg);
 
 	/* Clear all internal status */
 	priv->tx_head = 0;
@@ -806,7 +812,7 @@ static void bxcan_chip_stop(struct net_device *ndev)
 		  BXCAN_IER_EPVIE | BXCAN_IER_EWGIE | BXCAN_IER_FOVIE1 |
 		  BXCAN_IER_FFIE1 | BXCAN_IER_FMPIE1 | BXCAN_IER_FOVIE0 |
 		  BXCAN_IER_FFIE0 | BXCAN_IER_FMPIE0 | BXCAN_IER_TMEIE, 0);
-	bxcan_disable_filters(priv, priv->primary);
+	bxcan_disable_filters(priv, priv->cfg);
 	bxcan_enter_sleep_mode(priv);
 	priv->can.state = CAN_STATE_STOPPED;
 }
@@ -931,7 +937,7 @@ static int bxcan_probe(struct platform_device *pdev)
 	struct clk *clk = NULL;
 	void __iomem *regs;
 	struct regmap *gcan;
-	bool primary;
+	enum bxcan_cfg cfg;
 	int err, rx_irq, tx_irq, sce_irq;
 
 	regs = devm_platform_ioremap_resource(pdev, 0);
@@ -946,7 +952,13 @@ static int bxcan_probe(struct platform_device *pdev)
 		return PTR_ERR(gcan);
 	}
 
-	primary = of_property_read_bool(np, "st,can-primary");
+	if (of_property_read_bool(np, "st,can-primary"))
+		cfg = BXCAN_CFG_DUAL_PRIMARY;
+	else if (of_property_read_bool(np, "st,can-secondary"))
+		cfg = BXCAN_CFG_DUAL_SECONDARY;
+	else
+		cfg = BXCAN_CFG_SINGLE;
+
 	clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to get clock\n");
@@ -992,7 +1004,7 @@ static int bxcan_probe(struct platform_device *pdev)
 	priv->clk = clk;
 	priv->tx_irq = tx_irq;
 	priv->sce_irq = sce_irq;
-	priv->primary = primary;
+	priv->cfg = cfg;
 	priv->can.clock.freq = clk_get_rate(clk);
 	spin_lock_init(&priv->rmw_lock);
 	priv->tx_head = 0;
diff --git a/drivers/net/can/dev/skb.c b/drivers/net/can/dev/skb.c
index 241ec636e91f..f6d05b3ef59a 100644
--- a/drivers/net/can/dev/skb.c
+++ b/drivers/net/can/dev/skb.c
@@ -54,7 +54,8 @@ int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
 	/* check flag whether this packet has to be looped back */
 	if (!(dev->flags & IFF_ECHO) ||
 	    (skb->protocol != htons(ETH_P_CAN) &&
-	     skb->protocol != htons(ETH_P_CANFD))) {
+	     skb->protocol != htons(ETH_P_CANFD) &&
+	     skb->protocol != htons(ETH_P_CANXL))) {
 		kfree_skb(skb);
 		return 0;
 	}