[PATCH v6 0/12] can: c_can: add support to 64 message objects

[PATCH v6 0/12] can: c_can: add support to 64 message objects

[Marc Kleine-Budde]

Hello,

this series picks up Dario Binacchi's patches and adds some cleanup
patches in front.

The D_CAN controller supports up to 128 messages. Until now the driver
only managed 32 messages although Sitara processors and DRA7 SOC can
handle 64.

The series was tested on a beaglebone board.

Note:
I have not changed the type of tx_field (belonging to the c_can_priv
structure) to atomic64_t because I think the atomic_t type has size
of at least 32 bits on x86 and arm, which is enough to handle 64
messages.
http://marc.info/?l=linux-can&m=139746476821294&w=2 reports the results
of tests performed just on x86 and arm architectures.

Changes in v6:
- make patches
  [PATCH v5 0/11] can: c_can: add support to 64 message objects
  [PATCH v5 0/11] can: c_can: add support to 64 message objects
  separate again, they have been squashed accidentally 

Changes in v5:
- Add cleanup patches
- alloc_c_can_dev(): make use of struct_size()

Changes in v4:
- Restore IF_RX interface.
- Add a comment to clarify why IF_RX interface is used instead of IF_TX.
- Use GENMASK() for setting msg_obj_rx_mask.
- Use BIT() for setting single bits and GENMASK() for setting masks.

Changes in v3:
- Use unsigned int instead of int as type of the msg_obj_* fields
  in the c_can_priv structure.
- Replace (u64)1 with 1UL in msg_obj_rx_mask setting.
- Use unsigned int instead of int as type of the msg_obj_num field
  in c_can_driver_data and c_can_pci_data structures.

Changes in v2:
- Fix compiling error reported by kernel test robot.
- Add Reported-by tag.
- Pass larger size to alloc_candev() routine to avoid an additional
  memory allocation/deallocation.
- Add message objects number to PCI driver data.

[PATCH v6 01/12] can: c_can: convert block comments to network style comments

[Marc Kleine-Budde]

This patch converts all block comments to network subsystem style
block comments.

Link: https://lore.kernel.org/r/20210304154240.2747987-2-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c     | 52 ++++++++++---------------------
 drivers/net/can/c_can/c_can_pci.c |  3 +-
 2 files changed, 18 insertions(+), 37 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index ef474bae47a1..b55931806479 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -161,9 +161,7 @@
 
 #define IF_MCONT_TX		(IF_MCONT_TXIE | IF_MCONT_EOB)
 
-/*
- * Use IF1 for RX and IF2 for TX
- */
+/* Use IF1 for RX and IF2 for TX */
 #define IF_RX			0
 #define IF_TX			1
 
@@ -189,8 +187,7 @@ enum c_can_lec_type {
 	LEC_MASK = LEC_UNUSED,
 };
 
-/*
- * c_can error types:
+/* c_can error types:
  * Bus errors (BUS_OFF, ERROR_WARNING, ERROR_PASSIVE) are supported
  */
 enum c_can_bus_error_types {
@@ -280,8 +277,7 @@ static inline void c_can_object_put(struct net_device *dev, int iface,
 	c_can_obj_update(dev, iface, cmd | IF_COMM_WR, obj);
 }
 
-/*
- * Note: According to documentation clearing TXIE while MSGVAL is set
+/* Note: According to documentation clearing TXIE while MSGVAL is set
  * is not allowed, but works nicely on C/DCAN. And that lowers the I/O
  * load significantly.
  */
@@ -321,8 +317,7 @@ static void c_can_setup_tx_object(struct net_device *dev, int iface,
 	if (!rtr)
 		arb |= IF_ARB_TRANSMIT;
 
-	/*
-	 * If we change the DIR bit, we need to invalidate the buffer
+	/* If we change the DIR bit, we need to invalidate the buffer
 	 * first, i.e. clear the MSGVAL flag in the arbiter.
 	 */
 	if (rtr != (bool)test_bit(idx, &priv->tx_dir)) {
@@ -459,8 +454,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 
 	if (can_dropped_invalid_skb(dev, skb))
 		return NETDEV_TX_OK;
-	/*
-	 * This is not a FIFO. C/D_CAN sends out the buffers
+	/* This is not a FIFO. C/D_CAN sends out the buffers
 	 * prioritized. The lowest buffer number wins.
 	 */
 	idx = fls(atomic_read(&priv->tx_active));
@@ -469,8 +463,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 	/* If this is the last buffer, stop the xmit queue */
 	if (idx == C_CAN_MSG_OBJ_TX_NUM - 1)
 		netif_stop_queue(dev);
-	/*
-	 * Store the message in the interface so we can call
+	/* Store the message in the interface so we can call
 	 * can_put_echo_skb(). We must do this before we enable
 	 * transmit as we might race against do_tx().
 	 */
@@ -539,8 +532,7 @@ static int c_can_set_bittiming(struct net_device *dev)
 	return c_can_wait_for_ctrl_init(dev, priv, 0);
 }
 
-/*
- * Configure C_CAN message objects for Tx and Rx purposes:
+/* Configure C_CAN message objects for Tx and Rx purposes:
  * C_CAN provides a total of 32 message objects that can be configured
  * either for Tx or Rx purposes. Here the first 16 message objects are used as
  * a reception FIFO. The end of reception FIFO is signified by the EoB bit
@@ -584,8 +576,7 @@ static int c_can_software_reset(struct net_device *dev)
 	return 0;
 }
 
-/*
- * Configure C_CAN chip:
+/* Configure C_CAN chip:
  * - enable/disable auto-retransmission
  * - set operating mode
  * - configure message objects
@@ -751,8 +742,7 @@ static void c_can_do_tx(struct net_device *dev)
 	}
 }
 
-/*
- * If we have a gap in the pending bits, that means we either
+/* If we have a gap in the pending bits, that means we either
  * raced with the hardware or failed to readout all upper
  * objects in the last run due to quota limit.
  */
@@ -763,8 +753,7 @@ static u32 c_can_adjust_pending(u32 pend)
 	if (pend == RECEIVE_OBJECT_BITS)
 		return pend;
 
-	/*
-	 * If the last set bit is larger than the number of pending
+	/* If the last set bit is larger than the number of pending
 	 * bits we have a gap.
 	 */
 	weight = hweight32(pend);
@@ -774,8 +763,7 @@ static u32 c_can_adjust_pending(u32 pend)
 	if (lasts == weight)
 		return pend;
 
-	/*
-	 * Find the first set bit after the gap. We walk backwards
+	/* Find the first set bit after the gap. We walk backwards
 	 * from the last set bit.
 	 */
 	for (lasts--; pend & (1 << (lasts - 1)); lasts--);
@@ -815,8 +803,7 @@ static int c_can_read_objects(struct net_device *dev, struct c_can_priv *priv,
 			continue;
 		}
 
-		/*
-		 * This really should not happen, but this covers some
+		/* This really should not happen, but this covers some
 		 * odd HW behaviour. Do not remove that unless you
 		 * want to brick your machine.
 		 */
@@ -842,8 +829,7 @@ static inline u32 c_can_get_pending(struct c_can_priv *priv)
 	return pend;
 }
 
-/*
- * theory of operation:
+/* theory of operation:
  *
  * c_can core saves a received CAN message into the first free message
  * object it finds free (starting with the lowest). Bits NEWDAT and
@@ -860,8 +846,7 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 	struct c_can_priv *priv = netdev_priv(dev);
 	u32 pkts = 0, pend = 0, toread, n;
 
-	/*
-	 * It is faster to read only one 16bit register. This is only possible
+	/* It is faster to read only one 16bit register. This is only possible
 	 * for a maximum number of 16 objects.
 	 */
 	BUILD_BUG_ON_MSG(C_CAN_MSG_OBJ_RX_LAST > 16,
@@ -872,8 +857,7 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 			pend = c_can_get_pending(priv);
 			if (!pend)
 				break;
-			/*
-			 * If the pending field has a gap, handle the
+			/* If the pending field has a gap, handle the
 			 * bits above the gap first.
 			 */
 			toread = c_can_adjust_pending(pend);
@@ -991,8 +975,7 @@ static int c_can_handle_bus_err(struct net_device *dev,
 	struct can_frame *cf;
 	struct sk_buff *skb;
 
-	/*
-	 * early exit if no lec update or no error.
+	/* early exit if no lec update or no error.
 	 * no lec update means that no CAN bus event has been detected
 	 * since CPU wrote 0x7 value to status reg.
 	 */
@@ -1011,8 +994,7 @@ static int c_can_handle_bus_err(struct net_device *dev,
 	if (unlikely(!skb))
 		return 0;
 
-	/*
-	 * check for 'last error code' which tells us the
+	/* check for 'last error code' which tells us the
 	 * type of the last error to occur on the CAN bus
 	 */
 	cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 406b4847e5dc..4a39b39db3b9 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -41,8 +41,7 @@ struct c_can_pci_data {
 	void (*init)(const struct c_can_priv *priv, bool enable);
 };
 
-/*
- * 16-bit c_can registers can be arranged differently in the memory
+/* 16-bit c_can registers can be arranged differently in the memory
  * architecture of different implementations. For example: 16-bit
  * registers can be aligned to a 16-bit boundary or 32-bit boundary etc.
  * Handle the same by providing a common read/write interface.
-- 
2.30.1

[PATCH v6 02/12] can: c_can: remove unnecessary blank lines and add suggested ones

[Marc Kleine-Budde]

This patch removes unnecessary blank lines and add suggested ones, so
that checkpatch doesn't complain anymore.

Link: https://lore.kernel.org/r/20210304154240.2747987-3-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c     | 2 --
 drivers/net/can/c_can/c_can_pci.c | 1 +
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index b55931806479..b2bb9d1d8354 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -132,7 +132,6 @@
 /* For the high buffers we clear the interrupt bit and newdat */
 #define IF_COMM_RCV_HIGH	(IF_COMM_RCV_LOW | IF_COMM_CLR_NEWDAT)
 
-
 /* Receive setup of message objects */
 #define IF_COMM_RCV_SETUP	(IF_COMM_MASK | IF_COMM_ARB | IF_COMM_CONTROL)
 
@@ -262,7 +261,6 @@ static void c_can_obj_update(struct net_device *dev, int iface, u32 cmd, u32 obj
 		udelay(1);
 	}
 	netdev_err(dev, "Updating object timed out\n");
-
 }
 
 static inline void c_can_object_get(struct net_device *dev, int iface,
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 4a39b39db3b9..d2dcbba8b772 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -277,6 +277,7 @@ static const struct pci_device_id c_can_pci_tbl[] = {
 		 c_can_pch),
 	{},
 };
+
 static struct pci_driver c_can_pci_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = c_can_pci_tbl,
-- 
2.30.1

[PATCH v6 03/12] can: c_can: fix indention

[Marc Kleine-Budde]

This patch fixes the indention in the driver.

Link: https://lore.kernel.org/r/20210304154240.2747987-4-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c     | 12 ++++++------
 drivers/net/can/c_can/c_can.h     | 10 +++++-----
 drivers/net/can/c_can/c_can_pci.c | 16 ++++++++--------
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index b2bb9d1d8354..9563fa9a4dcf 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -514,7 +514,7 @@ static int c_can_set_bittiming(struct net_device *dev)
 	reg_brpe = brpe & BRP_EXT_BRPE_MASK;
 
 	netdev_info(dev,
-		"setting BTR=%04x BRPE=%04x\n", reg_btr, reg_brpe);
+		    "setting BTR=%04x BRPE=%04x\n", reg_btr, reg_brpe);
 
 	ctrl_save = priv->read_reg(priv, C_CAN_CTRL_REG);
 	ctrl_save &= ~CONTROL_INIT;
@@ -848,7 +848,7 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 	 * for a maximum number of 16 objects.
 	 */
 	BUILD_BUG_ON_MSG(C_CAN_MSG_OBJ_RX_LAST > 16,
-			"Implementation does not support more message objects than 16");
+			 "Implementation does not support more message objects than 16");
 
 	while (quota > 0) {
 		if (!pend) {
@@ -877,7 +877,7 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 }
 
 static int c_can_handle_state_change(struct net_device *dev,
-				enum c_can_bus_error_types error_type)
+				     enum c_can_bus_error_types error_type)
 {
 	unsigned int reg_err_counter;
 	unsigned int rx_err_passive;
@@ -1139,7 +1139,7 @@ static int c_can_open(struct net_device *dev)
 
 	/* register interrupt handler */
 	err = request_irq(dev->irq, &c_can_isr, IRQF_SHARED, dev->name,
-				dev);
+			  dev);
 	if (err < 0) {
 		netdev_err(dev, "failed to request interrupt\n");
 		goto exit_irq_fail;
@@ -1231,7 +1231,7 @@ int c_can_power_down(struct net_device *dev)
 	/* Wait for the PDA bit to get set */
 	time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS);
 	while (!(priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) &&
-				time_after(time_out, jiffies))
+	       time_after(time_out, jiffies))
 		cpu_relax();
 
 	if (time_after(jiffies, time_out))
@@ -1272,7 +1272,7 @@ int c_can_power_up(struct net_device *dev)
 	/* Wait for the PDA bit to get clear */
 	time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS);
 	while ((priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) &&
-				time_after(time_out, jiffies))
+	       time_after(time_out, jiffies))
 		cpu_relax();
 
 	if (time_after(jiffies, time_out)) {
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 92213d3d96eb..3d07285e46c1 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -201,16 +201,16 @@ struct c_can_priv {
 	atomic_t sie_pending;
 	unsigned long tx_dir;
 	int last_status;
-	u16 (*read_reg) (const struct c_can_priv *priv, enum reg index);
-	void (*write_reg) (const struct c_can_priv *priv, enum reg index, u16 val);
-	u32 (*read_reg32) (const struct c_can_priv *priv, enum reg index);
-	void (*write_reg32) (const struct c_can_priv *priv, enum reg index, u32 val);
+	u16 (*read_reg)(const struct c_can_priv *priv, enum reg index);
+	void (*write_reg)(const struct c_can_priv *priv, enum reg index, u16 val);
+	u32 (*read_reg32)(const struct c_can_priv *priv, enum reg index);
+	void (*write_reg32)(const struct c_can_priv *priv, enum reg index, u32 val);
 	void __iomem *base;
 	const u16 *regs;
 	void *priv;		/* for board-specific data */
 	enum c_can_dev_id type;
 	struct c_can_raminit raminit_sys;	/* RAMINIT via syscon regmap */
-	void (*raminit) (const struct c_can_priv *priv, bool enable);
+	void (*raminit)(const struct c_can_priv *priv, bool enable);
 	u32 comm_rcv_high;
 	u32 rxmasked;
 	u32 dlc[C_CAN_MSG_OBJ_TX_NUM];
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index d2dcbba8b772..26194adbadb1 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -47,25 +47,25 @@ struct c_can_pci_data {
  * Handle the same by providing a common read/write interface.
  */
 static u16 c_can_pci_read_reg_aligned_to_16bit(const struct c_can_priv *priv,
-						enum reg index)
+					       enum reg index)
 {
 	return readw(priv->base + priv->regs[index]);
 }
 
 static void c_can_pci_write_reg_aligned_to_16bit(const struct c_can_priv *priv,
-						enum reg index, u16 val)
+						 enum reg index, u16 val)
 {
 	writew(val, priv->base + priv->regs[index]);
 }
 
 static u16 c_can_pci_read_reg_aligned_to_32bit(const struct c_can_priv *priv,
-						enum reg index)
+					       enum reg index)
 {
 	return readw(priv->base + 2 * priv->regs[index]);
 }
 
 static void c_can_pci_write_reg_aligned_to_32bit(const struct c_can_priv *priv,
-						enum reg index, u16 val)
+						 enum reg index, u16 val)
 {
 	writew(val, priv->base + 2 * priv->regs[index]);
 }
@@ -87,13 +87,13 @@ static u32 c_can_pci_read_reg32(const struct c_can_priv *priv, enum reg index)
 	u32 val;
 
 	val = priv->read_reg(priv, index);
-	val |= ((u32) priv->read_reg(priv, index + 1)) << 16;
+	val |= ((u32)priv->read_reg(priv, index + 1)) << 16;
 
 	return val;
 }
 
 static void c_can_pci_write_reg32(const struct c_can_priv *priv, enum reg index,
-		u32 val)
+				  u32 val)
 {
 	priv->write_reg(priv, index + 1, val >> 16);
 	priv->write_reg(priv, index, val);
@@ -216,7 +216,7 @@ static int c_can_pci_probe(struct pci_dev *pdev,
 	}
 
 	dev_dbg(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
-		 KBUILD_MODNAME, priv->regs, dev->irq);
+		KBUILD_MODNAME, priv->regs, dev->irq);
 
 	return 0;
 
@@ -250,7 +250,7 @@ static void c_can_pci_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
-static const struct c_can_pci_data c_can_sta2x11= {
+static const struct c_can_pci_data c_can_sta2x11 = {
 	.type = BOSCH_C_CAN,
 	.reg_align = C_CAN_REG_ALIGN_32,
 	.freq = 52000000, /* 52 Mhz */
-- 
2.30.1

[PATCH v6 04/12] can: c_can: fix print formating string

[Marc Kleine-Budde]

This patch fixes the print format string in the driver, so that it
stays in a single line.

Link: https://lore.kernel.org/r/20210304154240.2747987-5-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can_pci.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 26194adbadb1..8cd9578b30b4 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -141,8 +141,7 @@ static int c_can_pci_probe(struct pci_dev *pdev,
 			 pci_resource_len(pdev, c_can_pci_data->bar));
 	if (!addr) {
 		dev_err(&pdev->dev,
-			"device has no PCI memory resources, "
-			"failing adapter\n");
+			"device has no PCI memory resources, failing adapter\n");
 		ret = -ENOMEM;
 		goto out_release_regions;
 	}
-- 
2.30.1

[PATCH v6 05/12] can: c_can: replace double assignments by two single ones

[Marc Kleine-Budde]

This patch replaces the double assignments by two single ones, to make
checkpatch happy.

Link: https://lore.kernel.org/r/20210304154240.2747987-6-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 9563fa9a4dcf..eb9b1ab09484 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -715,7 +715,8 @@ static void c_can_do_tx(struct net_device *dev)
 	struct net_device_stats *stats = &dev->stats;
 	u32 idx, obj, pkts = 0, bytes = 0, pend, clr;
 
-	clr = pend = priv->read_reg(priv, C_CAN_INTPND2_REG);
+	pend = priv->read_reg(priv, C_CAN_INTPND2_REG);
+	clr = pend;
 
 	while ((idx = ffs(pend))) {
 		idx--;
@@ -1041,7 +1042,8 @@ static int c_can_poll(struct napi_struct *napi, int quota)
 
 	/* Only read the status register if a status interrupt was pending */
 	if (atomic_xchg(&priv->sie_pending, 0)) {
-		priv->last_status = curr = priv->read_reg(priv, C_CAN_STS_REG);
+		priv->last_status = priv->read_reg(priv, C_CAN_STS_REG);
+		curr = priv->last_status;
 		/* Ack status on C_CAN. D_CAN is self clearing */
 		if (priv->type != BOSCH_D_CAN)
 			priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
-- 
2.30.1

[PATCH v6 06/12] can: c_can: fix remaining checkpatch warnings

[Marc Kleine-Budde]

This patch fixes the remaining checkpatch warnings in the driver.

Link: https://lore.kernel.org/r/20210304154240.2747987-7-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c     | 3 ++-
 drivers/net/can/c_can/c_can_pci.c | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index eb9b1ab09484..b820002fb81e 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -765,7 +765,8 @@ static u32 c_can_adjust_pending(u32 pend)
 	/* Find the first set bit after the gap. We walk backwards
 	 * from the last set bit.
 	 */
-	for (lasts--; pend & (1 << (lasts - 1)); lasts--);
+	for (lasts--; pend & (1 << (lasts - 1)); lasts--)
+		;
 
 	return pend & ~((1 << lasts) - 1);
 }
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 8cd9578b30b4..ad5683cdf1b8 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -266,7 +266,7 @@ static const struct c_can_pci_data c_can_pch = {
 
 #define C_CAN_ID(_vend, _dev, _driverdata) {		\
 	PCI_DEVICE(_vend, _dev),			\
-	.driver_data = (unsigned long)&_driverdata,	\
+	.driver_data = (unsigned long)&(_driverdata),	\
 }
 
 static const struct pci_device_id c_can_pci_tbl[] = {
-- 
2.30.1

[PATCH v6 07/12] can: c_can: remove unused code

[Marc Kleine-Budde]

From: Dario Binacchi <dariobin@libero.it>

Commit 9d23a9818cb1 ("can: c_can: Remove unused inline function") left
behind C_CAN_MSG_OBJ_TX_LAST constant.

Commit fa39b54ccf28 ("can: c_can: Get rid of pointless interrupts") left
behind C_CAN_MSG_RX_LOW_LAST and C_CAN_MSG_OBJ_RX_SPLIT constants.

The removed code also made a comment useless and misleading.

Link: https://lore.kernel.org/r/20210302215435.18286-2-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c | 3 +--
 drivers/net/can/c_can/c_can.h | 4 ----
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index b820002fb81e..e0c57cab7ab2 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -834,8 +834,7 @@ static inline u32 c_can_get_pending(struct c_can_priv *priv)
  * c_can core saves a received CAN message into the first free message
  * object it finds free (starting with the lowest). Bits NEWDAT and
  * INTPND are set for this message object indicating that a new message
- * has arrived. To work-around this issue, we keep two groups of message
- * objects whose partitioning is defined by C_CAN_MSG_OBJ_RX_SPLIT.
+ * has arrived.
  *
  * We clear the newdat bit right away.
  *
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 3d07285e46c1..7a7d3fb4b1c3 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -32,11 +32,7 @@
 				C_CAN_MSG_OBJ_RX_NUM - 1)
 
 #define C_CAN_MSG_OBJ_TX_FIRST	(C_CAN_MSG_OBJ_RX_LAST + 1)
-#define C_CAN_MSG_OBJ_TX_LAST	(C_CAN_MSG_OBJ_TX_FIRST + \
-				C_CAN_MSG_OBJ_TX_NUM - 1)
 
-#define C_CAN_MSG_OBJ_RX_SPLIT	9
-#define C_CAN_MSG_RX_LOW_LAST	(C_CAN_MSG_OBJ_RX_SPLIT - 1)
 #define RECEIVE_OBJECT_BITS	0x0000ffff
 
 enum reg {
-- 
2.30.1

[PATCH v6 08/12] can: c_can: fix indentation

[Marc Kleine-Budde]

From: Dario Binacchi <dariobin@libero.it>

Commit 524369e2391f ("can: c_can: remove obsolete STRICT_FRAME_ORDERING Kconfig option")
left behind wrong indentation, fix it.

Link: https://lore.kernel.org/r/20210302215435.18286-3-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index e0c57cab7ab2..ce4efc88a841 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -774,7 +774,7 @@ static u32 c_can_adjust_pending(u32 pend)
 static inline void c_can_rx_object_get(struct net_device *dev,
 				       struct c_can_priv *priv, u32 obj)
 {
-		c_can_object_get(dev, IF_RX, obj, priv->comm_rcv_high);
+	c_can_object_get(dev, IF_RX, obj, priv->comm_rcv_high);
 }
 
 static inline void c_can_rx_finalize(struct net_device *dev,
-- 
2.30.1

[PATCH v6 09/12] can: c_can: add a comment about IF_RX interface's use

[Marc Kleine-Budde]

From: Dario Binacchi <dariobin@libero.it>

After reading the commit 640916db2bf7 ("can: c_can: Make it SMP safe")
it may sound strange to see the IF_RX interface used by the
can_inval_tx_object function. A comment was added to avoid any
misunderstanding.

Link: https://lore.kernel.org/r/20210302215435.18286-4-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index ce4efc88a841..3c2cc9dbf5ad 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -722,6 +722,11 @@ static void c_can_do_tx(struct net_device *dev)
 		idx--;
 		pend &= ~(1 << idx);
 		obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
+
+		/* We use IF_RX interface instead of IF_TX because we
+		 * are called from c_can_poll(), which runs inside
+		 * NAPI. We are not trasmitting.
+		 */
 		c_can_inval_tx_object(dev, IF_RX, obj);
 		can_get_echo_skb(dev, idx, NULL);
 		bytes += priv->dlc[idx];
-- 
2.30.1

[PATCH v6 10/12] can: c_can: use 32-bit write to set arbitration register

[Marc Kleine-Budde]

From: Dario Binacchi <dariobin@libero.it>

The arbitration register is already set up with 32-bit writes in the
other parts of the code except for this point.

Link: https://lore.kernel.org/r/20210302215435.18286-5-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 3c2cc9dbf5ad..4bb8a7bcac50 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -291,8 +291,7 @@ static void c_can_inval_msg_object(struct net_device *dev, int iface, int obj)
 {
 	struct c_can_priv *priv = netdev_priv(dev);
 
-	priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface), 0);
-	priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface), 0);
+	priv->write_reg32(priv, C_CAN_IFACE(ARB1_REG, iface), 0);
 	c_can_inval_tx_object(dev, iface, obj);
 }
 
-- 
2.30.1

[PATCH v6 11/12] can: c_can: prepare to up the message objects number

[Marc Kleine-Budde]

From: Dario Binacchi <dariobin@libero.it>

As pointed by commit c0a9f4d396c9 ("can: c_can: Reduce register
access") the "driver casts the 16 message objects in stone, which is
completely braindead as contemporary hardware has up to 128 message
objects".

The patch prepares the module to extend the number of message objects
beyond the 32 currently managed. This was achieved by transforming the
constants used to manage RX/TX messages into variables without
changing the driver policy.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20210302215435.18286-6-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c          | 50 ++++++++++++++++----------
 drivers/net/can/c_can/c_can.h          | 23 ++++++------
 drivers/net/can/c_can/c_can_pci.c      |  2 +-
 drivers/net/can/c_can/c_can_platform.c |  2 +-
 4 files changed, 43 insertions(+), 34 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 4bb8a7bcac50..2e856c2947ea 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -170,9 +170,6 @@
 /* Wait for ~1 sec for INIT bit */
 #define INIT_WAIT_MS		1000
 
-/* napi related */
-#define C_CAN_NAPI_WEIGHT	C_CAN_MSG_OBJ_RX_NUM
-
 /* c_can lec values */
 enum c_can_lec_type {
 	LEC_NO_ERROR = 0,
@@ -318,7 +315,7 @@ static void c_can_setup_tx_object(struct net_device *dev, int iface,
 	 * first, i.e. clear the MSGVAL flag in the arbiter.
 	 */
 	if (rtr != (bool)test_bit(idx, &priv->tx_dir)) {
-		u32 obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
+		u32 obj = idx + priv->msg_obj_tx_first;
 
 		c_can_inval_msg_object(dev, iface, obj);
 		change_bit(idx, &priv->tx_dir);
@@ -455,10 +452,10 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 	 * prioritized. The lowest buffer number wins.
 	 */
 	idx = fls(atomic_read(&priv->tx_active));
-	obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
+	obj = idx + priv->msg_obj_tx_first;
 
 	/* If this is the last buffer, stop the xmit queue */
-	if (idx == C_CAN_MSG_OBJ_TX_NUM - 1)
+	if (idx == priv->msg_obj_tx_num - 1)
 		netif_stop_queue(dev);
 	/* Store the message in the interface so we can call
 	 * can_put_echo_skb(). We must do this before we enable
@@ -539,17 +536,18 @@ static int c_can_set_bittiming(struct net_device *dev)
  */
 static void c_can_configure_msg_objects(struct net_device *dev)
 {
+	struct c_can_priv *priv = netdev_priv(dev);
 	int i;
 
 	/* first invalidate all message objects */
-	for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_NO_OF_OBJECTS; i++)
+	for (i = priv->msg_obj_rx_first; i <= priv->msg_obj_num; i++)
 		c_can_inval_msg_object(dev, IF_RX, i);
 
 	/* setup receive message objects */
-	for (i = C_CAN_MSG_OBJ_RX_FIRST; i < C_CAN_MSG_OBJ_RX_LAST; i++)
+	for (i = priv->msg_obj_rx_first; i < priv->msg_obj_rx_last; i++)
 		c_can_setup_receive_object(dev, IF_RX, i, 0, 0, IF_MCONT_RCV);
 
-	c_can_setup_receive_object(dev, IF_RX, C_CAN_MSG_OBJ_RX_LAST, 0, 0,
+	c_can_setup_receive_object(dev, IF_RX, priv->msg_obj_rx_last, 0, 0,
 				   IF_MCONT_RCV_EOB);
 }
 
@@ -720,7 +718,7 @@ static void c_can_do_tx(struct net_device *dev)
 	while ((idx = ffs(pend))) {
 		idx--;
 		pend &= ~(1 << idx);
-		obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
+		obj = idx + priv->msg_obj_tx_first;
 
 		/* We use IF_RX interface instead of IF_TX because we
 		 * are called from c_can_poll(), which runs inside
@@ -735,7 +733,7 @@ static void c_can_do_tx(struct net_device *dev)
 	/* Clear the bits in the tx_active mask */
 	atomic_sub(clr, &priv->tx_active);
 
-	if (clr & (1 << (C_CAN_MSG_OBJ_TX_NUM - 1)))
+	if (clr & (1 << (priv->msg_obj_tx_num - 1)))
 		netif_wake_queue(dev);
 
 	if (pkts) {
@@ -749,11 +747,11 @@ static void c_can_do_tx(struct net_device *dev)
  * raced with the hardware or failed to readout all upper
  * objects in the last run due to quota limit.
  */
-static u32 c_can_adjust_pending(u32 pend)
+static u32 c_can_adjust_pending(u32 pend, u32 rx_mask)
 {
 	u32 weight, lasts;
 
-	if (pend == RECEIVE_OBJECT_BITS)
+	if (pend == rx_mask)
 		return pend;
 
 	/* If the last set bit is larger than the number of pending
@@ -852,8 +850,7 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 	/* It is faster to read only one 16bit register. This is only possible
 	 * for a maximum number of 16 objects.
 	 */
-	BUILD_BUG_ON_MSG(C_CAN_MSG_OBJ_RX_LAST > 16,
-			 "Implementation does not support more message objects than 16");
+	WARN_ON(priv->msg_obj_rx_last > 16);
 
 	while (quota > 0) {
 		if (!pend) {
@@ -863,7 +860,8 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 			/* If the pending field has a gap, handle the
 			 * bits above the gap first.
 			 */
-			toread = c_can_adjust_pending(pend);
+			toread = c_can_adjust_pending(pend,
+						      priv->msg_obj_rx_mask);
 		} else {
 			toread = pend;
 		}
@@ -1193,17 +1191,31 @@ static int c_can_close(struct net_device *dev)
 	return 0;
 }
 
-struct net_device *alloc_c_can_dev(void)
+struct net_device *alloc_c_can_dev(int msg_obj_num)
 {
 	struct net_device *dev;
 	struct c_can_priv *priv;
+	int msg_obj_tx_num = msg_obj_num / 2;
 
-	dev = alloc_candev(sizeof(struct c_can_priv), C_CAN_MSG_OBJ_TX_NUM);
+	dev = alloc_candev(struct_size(priv, dlc, msg_obj_tx_num),
+			   msg_obj_tx_num);
 	if (!dev)
 		return NULL;
 
 	priv = netdev_priv(dev);
-	netif_napi_add(dev, &priv->napi, c_can_poll, C_CAN_NAPI_WEIGHT);
+	priv->msg_obj_num = msg_obj_num;
+	priv->msg_obj_rx_num = msg_obj_num - msg_obj_tx_num;
+	priv->msg_obj_rx_first = 1;
+	priv->msg_obj_rx_last =
+		priv->msg_obj_rx_first + priv->msg_obj_rx_num - 1;
+	priv->msg_obj_rx_mask = GENMASK(priv->msg_obj_rx_num - 1, 0);
+
+	priv->msg_obj_tx_num = msg_obj_tx_num;
+	priv->msg_obj_tx_first = priv->msg_obj_rx_last + 1;
+	priv->msg_obj_tx_last =
+		priv->msg_obj_tx_first + priv->msg_obj_tx_num - 1;
+
+	netif_napi_add(dev, &priv->napi, c_can_poll, priv->msg_obj_rx_num);
 
 	priv->dev = dev;
 	priv->can.bittiming_const = &c_can_bittiming_const;
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 7a7d3fb4b1c3..ee703b7ed42d 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -22,18 +22,7 @@
 #ifndef C_CAN_H
 #define C_CAN_H
 
-/* message object split */
 #define C_CAN_NO_OF_OBJECTS	32
-#define C_CAN_MSG_OBJ_RX_NUM	16
-#define C_CAN_MSG_OBJ_TX_NUM	16
-
-#define C_CAN_MSG_OBJ_RX_FIRST	1
-#define C_CAN_MSG_OBJ_RX_LAST	(C_CAN_MSG_OBJ_RX_FIRST + \
-				C_CAN_MSG_OBJ_RX_NUM - 1)
-
-#define C_CAN_MSG_OBJ_TX_FIRST	(C_CAN_MSG_OBJ_RX_LAST + 1)
-
-#define RECEIVE_OBJECT_BITS	0x0000ffff
 
 enum reg {
 	C_CAN_CTRL_REG = 0,
@@ -193,6 +182,14 @@ struct c_can_priv {
 	struct napi_struct napi;
 	struct net_device *dev;
 	struct device *device;
+	unsigned int msg_obj_num;
+	unsigned int msg_obj_rx_num;
+	unsigned int msg_obj_tx_num;
+	unsigned int msg_obj_rx_first;
+	unsigned int msg_obj_rx_last;
+	unsigned int msg_obj_tx_first;
+	unsigned int msg_obj_tx_last;
+	u32 msg_obj_rx_mask;
 	atomic_t tx_active;
 	atomic_t sie_pending;
 	unsigned long tx_dir;
@@ -209,10 +206,10 @@ struct c_can_priv {
 	void (*raminit)(const struct c_can_priv *priv, bool enable);
 	u32 comm_rcv_high;
 	u32 rxmasked;
-	u32 dlc[C_CAN_MSG_OBJ_TX_NUM];
+	u32 dlc[];
 };
 
-struct net_device *alloc_c_can_dev(void);
+struct net_device *alloc_c_can_dev(int msg_obj_num);
 void free_c_can_dev(struct net_device *dev);
 int register_c_can_dev(struct net_device *dev);
 void unregister_c_can_dev(struct net_device *dev);
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index ad5683cdf1b8..911d97b4ba9c 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -147,7 +147,7 @@ static int c_can_pci_probe(struct pci_dev *pdev,
 	}
 
 	/* allocate the c_can device */
-	dev = alloc_c_can_dev();
+	dev = alloc_c_can_dev(C_CAN_NO_OF_OBJECTS);
 	if (!dev) {
 		ret = -ENOMEM;
 		goto out_iounmap;
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 05f425ceb53a..a5b9b1a93702 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -293,7 +293,7 @@ static int c_can_plat_probe(struct platform_device *pdev)
 	}
 
 	/* allocate the c_can device */
-	dev = alloc_c_can_dev();
+	dev = alloc_c_can_dev(C_CAN_NO_OF_OBJECTS);
 	if (!dev) {
 		ret = -ENOMEM;
 		goto exit;
-- 
2.30.1

[PATCH v6 12/12] can: c_can: add support to 64 message objects

[Marc Kleine-Budde]

From: Dario Binacchi <dariobin@libero.it>

D_CAN controller supports 16, 32, 64 or 128 message objects, comparing
to 32 on C_CAN. AM335x/AM437x Sitara processors and DRA7 SOC all
instantiate a D_CAN controller with 64 message objects, as described
in the "DCAN features" subsection of the CAN chapter of their
technical reference manuals.

The driver policy has been kept unchanged, and as in the previous
version, the first half of the message objects is used for reception
and the second for transmission.

The I/O load is increased only in the case of 64 message objects,
keeping it unchanged in the case of 32. Two 32-bit read accesses are
in fact required, which however remained at 16-bit for configurations
with 32 message objects.

Link: https://lore.kernel.org/r/20210302215435.18286-7-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can.c          | 27 ++++++++++++++------------
 drivers/net/can/c_can/c_can.h          |  5 +++--
 drivers/net/can/c_can/c_can_pci.c      |  6 +++++-
 drivers/net/can/c_can/c_can_platform.c |  6 +++++-
 4 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 2e856c2947ea..9c1aa33fa256 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -466,7 +466,7 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
 	can_put_echo_skb(skb, dev, idx, 0);
 
 	/* Update the active bits */
-	atomic_add((1 << idx), &priv->tx_active);
+	atomic_add(BIT(idx), &priv->tx_active);
 	/* Start transmission */
 	c_can_object_put(dev, IF_TX, obj, IF_COMM_TX);
 
@@ -712,12 +712,15 @@ static void c_can_do_tx(struct net_device *dev)
 	struct net_device_stats *stats = &dev->stats;
 	u32 idx, obj, pkts = 0, bytes = 0, pend, clr;
 
-	pend = priv->read_reg(priv, C_CAN_INTPND2_REG);
+	if (priv->msg_obj_tx_last > 32)
+		pend = priv->read_reg32(priv, C_CAN_INTPND3_REG);
+	else
+		pend = priv->read_reg(priv, C_CAN_INTPND2_REG);
 	clr = pend;
 
 	while ((idx = ffs(pend))) {
 		idx--;
-		pend &= ~(1 << idx);
+		pend &= ~BIT(idx);
 		obj = idx + priv->msg_obj_tx_first;
 
 		/* We use IF_RX interface instead of IF_TX because we
@@ -733,7 +736,7 @@ static void c_can_do_tx(struct net_device *dev)
 	/* Clear the bits in the tx_active mask */
 	atomic_sub(clr, &priv->tx_active);
 
-	if (clr & (1 << (priv->msg_obj_tx_num - 1)))
+	if (clr & BIT(priv->msg_obj_tx_num - 1))
 		netif_wake_queue(dev);
 
 	if (pkts) {
@@ -767,10 +770,10 @@ static u32 c_can_adjust_pending(u32 pend, u32 rx_mask)
 	/* Find the first set bit after the gap. We walk backwards
 	 * from the last set bit.
 	 */
-	for (lasts--; pend & (1 << (lasts - 1)); lasts--)
+	for (lasts--; pend & BIT(lasts - 1); lasts--)
 		;
 
-	return pend & ~((1 << lasts) - 1);
+	return pend & ~GENMASK(lasts - 1, 0);
 }
 
 static inline void c_can_rx_object_get(struct net_device *dev,
@@ -826,7 +829,12 @@ static int c_can_read_objects(struct net_device *dev, struct c_can_priv *priv,
 
 static inline u32 c_can_get_pending(struct c_can_priv *priv)
 {
-	u32 pend = priv->read_reg(priv, C_CAN_NEWDAT1_REG);
+	u32 pend;
+
+	if (priv->msg_obj_rx_last > 16)
+		pend = priv->read_reg32(priv, C_CAN_NEWDAT1_REG);
+	else
+		pend = priv->read_reg(priv, C_CAN_NEWDAT1_REG);
 
 	return pend;
 }
@@ -847,11 +855,6 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
 	struct c_can_priv *priv = netdev_priv(dev);
 	u32 pkts = 0, pend = 0, toread, n;
 
-	/* It is faster to read only one 16bit register. This is only possible
-	 * for a maximum number of 16 objects.
-	 */
-	WARN_ON(priv->msg_obj_rx_last > 16);
-
 	while (quota > 0) {
 		if (!pend) {
 			pend = c_can_get_pending(priv);
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index ee703b7ed42d..8acedd9e63a7 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -22,8 +22,6 @@
 #ifndef C_CAN_H
 #define C_CAN_H
 
-#define C_CAN_NO_OF_OBJECTS	32
-
 enum reg {
 	C_CAN_CTRL_REG = 0,
 	C_CAN_CTRL_EX_REG,
@@ -61,6 +59,7 @@ enum reg {
 	C_CAN_NEWDAT2_REG,
 	C_CAN_INTPND1_REG,
 	C_CAN_INTPND2_REG,
+	C_CAN_INTPND3_REG,
 	C_CAN_MSGVAL1_REG,
 	C_CAN_MSGVAL2_REG,
 	C_CAN_FUNCTION_REG,
@@ -122,6 +121,7 @@ static const u16 __maybe_unused reg_map_d_can[] = {
 	[C_CAN_NEWDAT2_REG]	= 0x9E,
 	[C_CAN_INTPND1_REG]	= 0xB0,
 	[C_CAN_INTPND2_REG]	= 0xB2,
+	[C_CAN_INTPND3_REG]	= 0xB4,
 	[C_CAN_MSGVAL1_REG]	= 0xC4,
 	[C_CAN_MSGVAL2_REG]	= 0xC6,
 	[C_CAN_IF1_COMREQ_REG]	= 0x100,
@@ -161,6 +161,7 @@ struct raminit_bits {
 
 struct c_can_driver_data {
 	enum c_can_dev_id id;
+	unsigned int msg_obj_num;
 
 	/* RAMINIT register description. Optional. */
 	const struct raminit_bits *raminit_bits; /* Array of START/DONE bit positions */
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 911d97b4ba9c..cb9baa7b8247 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -31,6 +31,8 @@ enum c_can_pci_reg_align {
 struct c_can_pci_data {
 	/* Specify if is C_CAN or D_CAN */
 	enum c_can_dev_id type;
+	/* Number of message objects */
+	unsigned int msg_obj_num;
 	/* Set the register alignment in the memory */
 	enum c_can_pci_reg_align reg_align;
 	/* Set the frequency */
@@ -147,7 +149,7 @@ static int c_can_pci_probe(struct pci_dev *pdev,
 	}
 
 	/* allocate the c_can device */
-	dev = alloc_c_can_dev(C_CAN_NO_OF_OBJECTS);
+	dev = alloc_c_can_dev(c_can_pci_data->msg_obj_num);
 	if (!dev) {
 		ret = -ENOMEM;
 		goto out_iounmap;
@@ -251,6 +253,7 @@ static void c_can_pci_remove(struct pci_dev *pdev)
 
 static const struct c_can_pci_data c_can_sta2x11 = {
 	.type = BOSCH_C_CAN,
+	.msg_obj_num = 32,
 	.reg_align = C_CAN_REG_ALIGN_32,
 	.freq = 52000000, /* 52 Mhz */
 	.bar = 0,
@@ -258,6 +261,7 @@ static const struct c_can_pci_data c_can_sta2x11 = {
 
 static const struct c_can_pci_data c_can_pch = {
 	.type = BOSCH_C_CAN,
+	.msg_obj_num = 32,
 	.reg_align = C_CAN_REG_32,
 	.freq = 50000000, /* 50 MHz */
 	.init = c_can_pci_reset_pch,
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index a5b9b1a93702..87a145b67a2f 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -192,10 +192,12 @@ static void c_can_hw_raminit(const struct c_can_priv *priv, bool enable)
 
 static const struct c_can_driver_data c_can_drvdata = {
 	.id = BOSCH_C_CAN,
+	.msg_obj_num = 32,
 };
 
 static const struct c_can_driver_data d_can_drvdata = {
 	.id = BOSCH_D_CAN,
+	.msg_obj_num = 32,
 };
 
 static const struct raminit_bits dra7_raminit_bits[] = {
@@ -205,6 +207,7 @@ static const struct raminit_bits dra7_raminit_bits[] = {
 
 static const struct c_can_driver_data dra7_dcan_drvdata = {
 	.id = BOSCH_D_CAN,
+	.msg_obj_num = 64,
 	.raminit_num = ARRAY_SIZE(dra7_raminit_bits),
 	.raminit_bits = dra7_raminit_bits,
 	.raminit_pulse = true,
@@ -217,6 +220,7 @@ static const struct raminit_bits am3352_raminit_bits[] = {
 
 static const struct c_can_driver_data am3352_dcan_drvdata = {
 	.id = BOSCH_D_CAN,
+	.msg_obj_num = 64,
 	.raminit_num = ARRAY_SIZE(am3352_raminit_bits),
 	.raminit_bits = am3352_raminit_bits,
 };
@@ -293,7 +297,7 @@ static int c_can_plat_probe(struct platform_device *pdev)
 	}
 
 	/* allocate the c_can device */
-	dev = alloc_c_can_dev(C_CAN_NO_OF_OBJECTS);
+	dev = alloc_c_can_dev(drvdata->msg_obj_num);
 	if (!dev) {
 		ret = -ENOMEM;
 		goto exit;
-- 
2.30.1

Re: [PATCH v6 0/12] can: c_can: add support to 64 message objects

[Dario Binacchi]

Hi Marc,

> Il 05/03/2021 14:01 Marc Kleine-Budde <mkl@pengutronix.de> ha scritto:
> 
>  
> Hello,
> 
> this series picks up Dario Binacchi's patches and adds some cleanup
> patches in front.
> 
> The D_CAN controller supports up to 128 messages. Until now the driver
> only managed 32 messages although Sitara processors and DRA7 SOC can
> handle 64.
> 
> The series was tested on a beaglebone board.
> 
> Note:
> I have not changed the type of tx_field (belonging to the c_can_priv
> structure) to atomic64_t because I think the atomic_t type has size
> of at least 32 bits on x86 and arm, which is enough to handle 64
> messages.
> http://marc.info/?l=linux-can&m=139746476821294&w=2 reports the results
> of tests performed just on x86 and arm architectures.
> 
> Changes in v6:
> - make patches
>   [PATCH v5 0/11] can: c_can: add support to 64 message objects
>   [PATCH v5 0/11] can: c_can: add support to 64 message objects
>   separate again, they have been squashed accidentally 
> 
> Changes in v5:
> - Add cleanup patches
> - alloc_c_can_dev(): make use of struct_size()
> 
> Changes in v4:
> - Restore IF_RX interface.
> - Add a comment to clarify why IF_RX interface is used instead of IF_TX.
> - Use GENMASK() for setting msg_obj_rx_mask.
> - Use BIT() for setting single bits and GENMASK() for setting masks.
> 
> Changes in v3:
> - Use unsigned int instead of int as type of the msg_obj_* fields
>   in the c_can_priv structure.
> - Replace (u64)1 with 1UL in msg_obj_rx_mask setting.
> - Use unsigned int instead of int as type of the msg_obj_num field
>   in c_can_driver_data and c_can_pci_data structures.
> 
> Changes in v2:
> - Fix compiling error reported by kernel test robot.
> - Add Reported-by tag.
> - Pass larger size to alloc_candev() routine to avoid an additional
>   memory allocation/deallocation.
> - Add message objects number to PCI driver data.

I tested the patch series on a custom board having two CAN ports.
I connected the CAN1 port to the CAN2 port with a cable. Then I
opened two terminals. On one I issued a dump command and on the
other the transmit command used in the tests described in
https://marc.info/?l=linux-can&m=139746476821294&w=2.

Terminal-1:
$ ip link set can1 type can bitrate <bitrate>
$ ip link set up can1
$ candump -t can1 >/tmp/can-test-<bitrate>/out

Terminal-2
$ ip link set can0 type can bitrate <bitrate>
$ ip link set up can0
$ time cangen can0 -g0 -p1 -I5A5 -L0 -x -n 1000000

Then I applied the following commands to the file generated by the dump
command:
$ wc -l </tmp/can-test-<bitrate>                                 # ca
$ egrep -v '  can1  5A5   \[0\]' /tmp/can-test-<bitrate> | wc -l # cb

I repeated the tests for 1000000, 500000, 250000 and 125000 bitrates,
before and after applying the series.
Here are the results.

Before applying the series:

 bitrate       time         ca         cb
  125000    6m 45.22s    1000000        0
  250000    3m 25.94s    1000000        0
  500000    1m 45.62s    1000000        0
 1000000    1m  9.28s    1000000        0

After applying the series:

 bitrate       time         ca         cb
  125000    6m 42.71s    1000000        0
  250000    3m 23.28s    1000000        0
  500000    1m 44.04s    1000000        0
 1000000    1m  8.44s    1000000        0

Thanks and regards,
Dario

Re: [PATCH v6 0/12] can: c_can: add support to 64 message objects

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 908 bytes --]

On 09.03.2021 13:41:31, Dario Binacchi wrote:
> Before applying the series:
> 
>  bitrate       time         ca         cb
>   125000    6m 45.22s    1000000        0
>   250000    3m 25.94s    1000000        0
>   500000    1m 45.62s    1000000        0
>  1000000    1m  9.28s    1000000        0
> 
> After applying the series:
> 
>  bitrate       time         ca         cb
>   125000    6m 42.71s    1000000        0
>   250000    3m 23.28s    1000000        0
>   500000    1m 44.04s    1000000        0
>  1000000    1m  8.44s    1000000        0

It even got marginally faster. \o/

Thanks for testing,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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