Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 3056 insertions, 0 deletions

diff --git a/drivers/net/can/rcar/Kconfig b/drivers/net/can/rcar/Kconfig
new file mode 100644
index 000000000..c66762ef6
--- /dev/null
+++ b/drivers/net/can/rcar/Kconfig
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+config CAN_RCAR
+	tristate "Renesas R-Car and RZ/G CAN controller"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	help
+	  Say Y here if you want to use CAN controller found on Renesas R-Car
+	  or RZ/G SoCs.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called rcar_can.
+
+config CAN_RCAR_CANFD
+	tristate "Renesas R-Car CAN FD controller"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	help
+	  Say Y here if you want to use CAN FD controller found on
+	  Renesas R-Car SoCs. The driver puts the controller in CAN FD only
+	  mode, which can interoperate with CAN2.0 nodes but does not support
+	  dedicated CAN 2.0 mode.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called rcar_canfd.
diff --git a/drivers/net/can/rcar/Makefile b/drivers/net/can/rcar/Makefile
new file mode 100644
index 000000000..c9185b0c0
--- /dev/null
+++ b/drivers/net/can/rcar/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+#  Makefile for the Renesas R-Car CAN & CAN FD controller drivers
+#
+
+obj-$(CONFIG_CAN_RCAR)		+= rcar_can.o
+obj-$(CONFIG_CAN_RCAR_CANFD)	+= rcar_canfd.o
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
new file mode 100644
index 000000000..cc43c9c5e
--- /dev/null
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -0,0 +1,919 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Renesas R-Car CAN device driver
+ *
+ * Copyright (C) 2013 Cogent Embedded, Inc. <source@cogentembedded.com>
+ * Copyright (C) 2013 Renesas Solutions Corp.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/ethtool.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/can/dev.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+
+#define RCAR_CAN_DRV_NAME	"rcar_can"
+
+/* Clock Select Register settings */
+enum CLKR {
+	CLKR_CLKP1 = 0, /* Peripheral clock (clkp1) */
+	CLKR_CLKP2 = 1, /* Peripheral clock (clkp2) */
+	CLKR_CLKEXT = 3, /* Externally input clock */
+};
+
+#define RCAR_SUPPORTED_CLOCKS	(BIT(CLKR_CLKP1) | BIT(CLKR_CLKP2) | \
+				 BIT(CLKR_CLKEXT))
+
+/* Mailbox configuration:
+ * mailbox 60 - 63 - Rx FIFO mailboxes
+ * mailbox 56 - 59 - Tx FIFO mailboxes
+ * non-FIFO mailboxes are not used
+ */
+#define RCAR_CAN_N_MBX		64 /* Number of mailboxes in non-FIFO mode */
+#define RCAR_CAN_RX_FIFO_MBX	60 /* Mailbox - window to Rx FIFO */
+#define RCAR_CAN_TX_FIFO_MBX	56 /* Mailbox - window to Tx FIFO */
+#define RCAR_CAN_FIFO_DEPTH	4
+
+/* Mailbox registers structure */
+struct rcar_can_mbox_regs {
+	u32 id;		/* IDE and RTR bits, SID and EID */
+	u8 stub;	/* Not used */
+	u8 dlc;		/* Data Length Code - bits [0..3] */
+	u8 data[8];	/* Data Bytes */
+	u8 tsh;		/* Time Stamp Higher Byte */
+	u8 tsl;		/* Time Stamp Lower Byte */
+};
+
+struct rcar_can_regs {
+	struct rcar_can_mbox_regs mb[RCAR_CAN_N_MBX]; /* Mailbox registers */
+	u32 mkr_2_9[8];	/* Mask Registers 2-9 */
+	u32 fidcr[2];	/* FIFO Received ID Compare Register */
+	u32 mkivlr1;	/* Mask Invalid Register 1 */
+	u32 mier1;	/* Mailbox Interrupt Enable Register 1 */
+	u32 mkr_0_1[2];	/* Mask Registers 0-1 */
+	u32 mkivlr0;    /* Mask Invalid Register 0*/
+	u32 mier0;      /* Mailbox Interrupt Enable Register 0 */
+	u8 pad_440[0x3c0];
+	u8 mctl[64];	/* Message Control Registers */
+	u16 ctlr;	/* Control Register */
+	u16 str;	/* Status register */
+	u8 bcr[3];	/* Bit Configuration Register */
+	u8 clkr;	/* Clock Select Register */
+	u8 rfcr;	/* Receive FIFO Control Register */
+	u8 rfpcr;	/* Receive FIFO Pointer Control Register */
+	u8 tfcr;	/* Transmit FIFO Control Register */
+	u8 tfpcr;       /* Transmit FIFO Pointer Control Register */
+	u8 eier;	/* Error Interrupt Enable Register */
+	u8 eifr;	/* Error Interrupt Factor Judge Register */
+	u8 recr;	/* Receive Error Count Register */
+	u8 tecr;        /* Transmit Error Count Register */
+	u8 ecsr;	/* Error Code Store Register */
+	u8 cssr;	/* Channel Search Support Register */
+	u8 mssr;	/* Mailbox Search Status Register */
+	u8 msmr;	/* Mailbox Search Mode Register */
+	u16 tsr;	/* Time Stamp Register */
+	u8 afsr;	/* Acceptance Filter Support Register */
+	u8 pad_857;
+	u8 tcr;		/* Test Control Register */
+	u8 pad_859[7];
+	u8 ier;		/* Interrupt Enable Register */
+	u8 isr;		/* Interrupt Status Register */
+	u8 pad_862;
+	u8 mbsmr;	/* Mailbox Search Mask Register */
+};
+
+struct rcar_can_priv {
+	struct can_priv can;	/* Must be the first member! */
+	struct net_device *ndev;
+	struct napi_struct napi;
+	struct rcar_can_regs __iomem *regs;
+	struct clk *clk;
+	struct clk *can_clk;
+	u32 tx_head;
+	u32 tx_tail;
+	u8 clock_select;
+	u8 ier;
+};
+
+static const struct can_bittiming_const rcar_can_bittiming_const = {
+	.name = RCAR_CAN_DRV_NAME,
+	.tseg1_min = 4,
+	.tseg1_max = 16,
+	.tseg2_min = 2,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+/* Control Register bits */
+#define RCAR_CAN_CTLR_BOM	(3 << 11) /* Bus-Off Recovery Mode Bits */
+#define RCAR_CAN_CTLR_BOM_ENT	(1 << 11) /* Entry to halt mode */
+					/* at bus-off entry */
+#define RCAR_CAN_CTLR_SLPM	(1 << 10)
+#define RCAR_CAN_CTLR_CANM	(3 << 8) /* Operating Mode Select Bit */
+#define RCAR_CAN_CTLR_CANM_HALT	(1 << 9)
+#define RCAR_CAN_CTLR_CANM_RESET (1 << 8)
+#define RCAR_CAN_CTLR_CANM_FORCE_RESET (3 << 8)
+#define RCAR_CAN_CTLR_MLM	(1 << 3) /* Message Lost Mode Select */
+#define RCAR_CAN_CTLR_IDFM	(3 << 1) /* ID Format Mode Select Bits */
+#define RCAR_CAN_CTLR_IDFM_MIXED (1 << 2) /* Mixed ID mode */
+#define RCAR_CAN_CTLR_MBM	(1 << 0) /* Mailbox Mode select */
+
+/* Status Register bits */
+#define RCAR_CAN_STR_RSTST	(1 << 8) /* Reset Status Bit */
+
+/* FIFO Received ID Compare Registers 0 and 1 bits */
+#define RCAR_CAN_FIDCR_IDE	(1 << 31) /* ID Extension Bit */
+#define RCAR_CAN_FIDCR_RTR	(1 << 30) /* Remote Transmission Request Bit */
+
+/* Receive FIFO Control Register bits */
+#define RCAR_CAN_RFCR_RFEST	(1 << 7) /* Receive FIFO Empty Status Flag */
+#define RCAR_CAN_RFCR_RFE	(1 << 0) /* Receive FIFO Enable */
+
+/* Transmit FIFO Control Register bits */
+#define RCAR_CAN_TFCR_TFUST	(7 << 1) /* Transmit FIFO Unsent Message */
+					/* Number Status Bits */
+#define RCAR_CAN_TFCR_TFUST_SHIFT 1	/* Offset of Transmit FIFO Unsent */
+					/* Message Number Status Bits */
+#define RCAR_CAN_TFCR_TFE	(1 << 0) /* Transmit FIFO Enable */
+
+#define RCAR_CAN_N_RX_MKREGS1	2	/* Number of mask registers */
+					/* for Rx mailboxes 0-31 */
+#define RCAR_CAN_N_RX_MKREGS2	8
+
+/* Bit Configuration Register settings */
+#define RCAR_CAN_BCR_TSEG1(x)	(((x) & 0x0f) << 20)
+#define RCAR_CAN_BCR_BPR(x)	(((x) & 0x3ff) << 8)
+#define RCAR_CAN_BCR_SJW(x)	(((x) & 0x3) << 4)
+#define RCAR_CAN_BCR_TSEG2(x)	((x) & 0x07)
+
+/* Mailbox and Mask Registers bits */
+#define RCAR_CAN_IDE		(1 << 31)
+#define RCAR_CAN_RTR		(1 << 30)
+#define RCAR_CAN_SID_SHIFT	18
+
+/* Mailbox Interrupt Enable Register 1 bits */
+#define RCAR_CAN_MIER1_RXFIE	(1 << 28) /* Receive  FIFO Interrupt Enable */
+#define RCAR_CAN_MIER1_TXFIE	(1 << 24) /* Transmit FIFO Interrupt Enable */
+
+/* Interrupt Enable Register bits */
+#define RCAR_CAN_IER_ERSIE	(1 << 5) /* Error (ERS) Interrupt Enable Bit */
+#define RCAR_CAN_IER_RXFIE	(1 << 4) /* Reception FIFO Interrupt */
+					/* Enable Bit */
+#define RCAR_CAN_IER_TXFIE	(1 << 3) /* Transmission FIFO Interrupt */
+					/* Enable Bit */
+/* Interrupt Status Register bits */
+#define RCAR_CAN_ISR_ERSF	(1 << 5) /* Error (ERS) Interrupt Status Bit */
+#define RCAR_CAN_ISR_RXFF	(1 << 4) /* Reception FIFO Interrupt */
+					/* Status Bit */
+#define RCAR_CAN_ISR_TXFF	(1 << 3) /* Transmission FIFO Interrupt */
+					/* Status Bit */
+
+/* Error Interrupt Enable Register bits */
+#define RCAR_CAN_EIER_BLIE	(1 << 7) /* Bus Lock Interrupt Enable */
+#define RCAR_CAN_EIER_OLIE	(1 << 6) /* Overload Frame Transmit */
+					/* Interrupt Enable */
+#define RCAR_CAN_EIER_ORIE	(1 << 5) /* Receive Overrun  Interrupt Enable */
+#define RCAR_CAN_EIER_BORIE	(1 << 4) /* Bus-Off Recovery Interrupt Enable */
+#define RCAR_CAN_EIER_BOEIE	(1 << 3) /* Bus-Off Entry Interrupt Enable */
+#define RCAR_CAN_EIER_EPIE	(1 << 2) /* Error Passive Interrupt Enable */
+#define RCAR_CAN_EIER_EWIE	(1 << 1) /* Error Warning Interrupt Enable */
+#define RCAR_CAN_EIER_BEIE	(1 << 0) /* Bus Error Interrupt Enable */
+
+/* Error Interrupt Factor Judge Register bits */
+#define RCAR_CAN_EIFR_BLIF	(1 << 7) /* Bus Lock Detect Flag */
+#define RCAR_CAN_EIFR_OLIF	(1 << 6) /* Overload Frame Transmission */
+					 /* Detect Flag */
+#define RCAR_CAN_EIFR_ORIF	(1 << 5) /* Receive Overrun Detect Flag */
+#define RCAR_CAN_EIFR_BORIF	(1 << 4) /* Bus-Off Recovery Detect Flag */
+#define RCAR_CAN_EIFR_BOEIF	(1 << 3) /* Bus-Off Entry Detect Flag */
+#define RCAR_CAN_EIFR_EPIF	(1 << 2) /* Error Passive Detect Flag */
+#define RCAR_CAN_EIFR_EWIF	(1 << 1) /* Error Warning Detect Flag */
+#define RCAR_CAN_EIFR_BEIF	(1 << 0) /* Bus Error Detect Flag */
+
+/* Error Code Store Register bits */
+#define RCAR_CAN_ECSR_EDPM	(1 << 7) /* Error Display Mode Select Bit */
+#define RCAR_CAN_ECSR_ADEF	(1 << 6) /* ACK Delimiter Error Flag */
+#define RCAR_CAN_ECSR_BE0F	(1 << 5) /* Bit Error (dominant) Flag */
+#define RCAR_CAN_ECSR_BE1F	(1 << 4) /* Bit Error (recessive) Flag */
+#define RCAR_CAN_ECSR_CEF	(1 << 3) /* CRC Error Flag */
+#define RCAR_CAN_ECSR_AEF	(1 << 2) /* ACK Error Flag */
+#define RCAR_CAN_ECSR_FEF	(1 << 1) /* Form Error Flag */
+#define RCAR_CAN_ECSR_SEF	(1 << 0) /* Stuff Error Flag */
+
+#define RCAR_CAN_NAPI_WEIGHT	4
+#define MAX_STR_READS		0x100
+
+static void tx_failure_cleanup(struct net_device *ndev)
+{
+	int i;
+
+	for (i = 0; i < RCAR_CAN_FIFO_DEPTH; i++)
+		can_free_echo_skb(ndev, i, NULL);
+}
+
+static void rcar_can_error(struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	u8 eifr, txerr = 0, rxerr = 0;
+
+	/* Propagate the error condition to the CAN stack */
+	skb = alloc_can_err_skb(ndev, &cf);
+
+	eifr = readb(&priv->regs->eifr);
+	if (eifr & (RCAR_CAN_EIFR_EWIF | RCAR_CAN_EIFR_EPIF)) {
+		txerr = readb(&priv->regs->tecr);
+		rxerr = readb(&priv->regs->recr);
+		if (skb)
+			cf->can_id |= CAN_ERR_CRTL;
+	}
+	if (eifr & RCAR_CAN_EIFR_BEIF) {
+		int rx_errors = 0, tx_errors = 0;
+		u8 ecsr;
+
+		netdev_dbg(priv->ndev, "Bus error interrupt:\n");
+		if (skb)
+			cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
+
+		ecsr = readb(&priv->regs->ecsr);
+		if (ecsr & RCAR_CAN_ECSR_ADEF) {
+			netdev_dbg(priv->ndev, "ACK Delimiter Error\n");
+			tx_errors++;
+			writeb(~RCAR_CAN_ECSR_ADEF, &priv->regs->ecsr);
+			if (skb)
+				cf->data[3] = CAN_ERR_PROT_LOC_ACK_DEL;
+		}
+		if (ecsr & RCAR_CAN_ECSR_BE0F) {
+			netdev_dbg(priv->ndev, "Bit Error (dominant)\n");
+			tx_errors++;
+			writeb(~RCAR_CAN_ECSR_BE0F, &priv->regs->ecsr);
+			if (skb)
+				cf->data[2] |= CAN_ERR_PROT_BIT0;
+		}
+		if (ecsr & RCAR_CAN_ECSR_BE1F) {
+			netdev_dbg(priv->ndev, "Bit Error (recessive)\n");
+			tx_errors++;
+			writeb(~RCAR_CAN_ECSR_BE1F, &priv->regs->ecsr);
+			if (skb)
+				cf->data[2] |= CAN_ERR_PROT_BIT1;
+		}
+		if (ecsr & RCAR_CAN_ECSR_CEF) {
+			netdev_dbg(priv->ndev, "CRC Error\n");
+			rx_errors++;
+			writeb(~RCAR_CAN_ECSR_CEF, &priv->regs->ecsr);
+			if (skb)
+				cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
+		}
+		if (ecsr & RCAR_CAN_ECSR_AEF) {
+			netdev_dbg(priv->ndev, "ACK Error\n");
+			tx_errors++;
+			writeb(~RCAR_CAN_ECSR_AEF, &priv->regs->ecsr);
+			if (skb) {
+				cf->can_id |= CAN_ERR_ACK;
+				cf->data[3] = CAN_ERR_PROT_LOC_ACK;
+			}
+		}
+		if (ecsr & RCAR_CAN_ECSR_FEF) {
+			netdev_dbg(priv->ndev, "Form Error\n");
+			rx_errors++;
+			writeb(~RCAR_CAN_ECSR_FEF, &priv->regs->ecsr);
+			if (skb)
+				cf->data[2] |= CAN_ERR_PROT_FORM;
+		}
+		if (ecsr & RCAR_CAN_ECSR_SEF) {
+			netdev_dbg(priv->ndev, "Stuff Error\n");
+			rx_errors++;
+			writeb(~RCAR_CAN_ECSR_SEF, &priv->regs->ecsr);
+			if (skb)
+				cf->data[2] |= CAN_ERR_PROT_STUFF;
+		}
+
+		priv->can.can_stats.bus_error++;
+		ndev->stats.rx_errors += rx_errors;
+		ndev->stats.tx_errors += tx_errors;
+		writeb(~RCAR_CAN_EIFR_BEIF, &priv->regs->eifr);
+	}
+	if (eifr & RCAR_CAN_EIFR_EWIF) {
+		netdev_dbg(priv->ndev, "Error warning interrupt\n");
+		priv->can.state = CAN_STATE_ERROR_WARNING;
+		priv->can.can_stats.error_warning++;
+		/* Clear interrupt condition */
+		writeb(~RCAR_CAN_EIFR_EWIF, &priv->regs->eifr);
+		if (skb)
+			cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_WARNING :
+					      CAN_ERR_CRTL_RX_WARNING;
+	}
+	if (eifr & RCAR_CAN_EIFR_EPIF) {
+		netdev_dbg(priv->ndev, "Error passive interrupt\n");
+		priv->can.state = CAN_STATE_ERROR_PASSIVE;
+		priv->can.can_stats.error_passive++;
+		/* Clear interrupt condition */
+		writeb(~RCAR_CAN_EIFR_EPIF, &priv->regs->eifr);
+		if (skb)
+			cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_PASSIVE :
+					      CAN_ERR_CRTL_RX_PASSIVE;
+	}
+	if (eifr & RCAR_CAN_EIFR_BOEIF) {
+		netdev_dbg(priv->ndev, "Bus-off entry interrupt\n");
+		tx_failure_cleanup(ndev);
+		priv->ier = RCAR_CAN_IER_ERSIE;
+		writeb(priv->ier, &priv->regs->ier);
+		priv->can.state = CAN_STATE_BUS_OFF;
+		/* Clear interrupt condition */
+		writeb(~RCAR_CAN_EIFR_BOEIF, &priv->regs->eifr);
+		priv->can.can_stats.bus_off++;
+		can_bus_off(ndev);
+		if (skb)
+			cf->can_id |= CAN_ERR_BUSOFF;
+	} else if (skb) {
+		cf->can_id |= CAN_ERR_CNT;
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
+	if (eifr & RCAR_CAN_EIFR_ORIF) {
+		netdev_dbg(priv->ndev, "Receive overrun error interrupt\n");
+		ndev->stats.rx_over_errors++;
+		ndev->stats.rx_errors++;
+		writeb(~RCAR_CAN_EIFR_ORIF, &priv->regs->eifr);
+		if (skb) {
+			cf->can_id |= CAN_ERR_CRTL;
+			cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+		}
+	}
+	if (eifr & RCAR_CAN_EIFR_OLIF) {
+		netdev_dbg(priv->ndev,
+			   "Overload Frame Transmission error interrupt\n");
+		ndev->stats.rx_over_errors++;
+		ndev->stats.rx_errors++;
+		writeb(~RCAR_CAN_EIFR_OLIF, &priv->regs->eifr);
+		if (skb) {
+			cf->can_id |= CAN_ERR_PROT;
+			cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
+		}
+	}
+
+	if (skb)
+		netif_rx(skb);
+}
+
+static void rcar_can_tx_done(struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	u8 isr;
+
+	while (1) {
+		u8 unsent = readb(&priv->regs->tfcr);
+
+		unsent = (unsent & RCAR_CAN_TFCR_TFUST) >>
+			  RCAR_CAN_TFCR_TFUST_SHIFT;
+		if (priv->tx_head - priv->tx_tail <= unsent)
+			break;
+		stats->tx_packets++;
+		stats->tx_bytes +=
+			can_get_echo_skb(ndev,
+					 priv->tx_tail % RCAR_CAN_FIFO_DEPTH,
+					 NULL);
+
+		priv->tx_tail++;
+		netif_wake_queue(ndev);
+	}
+	/* Clear interrupt */
+	isr = readb(&priv->regs->isr);
+	writeb(isr & ~RCAR_CAN_ISR_TXFF, &priv->regs->isr);
+}
+
+static irqreturn_t rcar_can_interrupt(int irq, void *dev_id)
+{
+	struct net_device *ndev = dev_id;
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	u8 isr;
+
+	isr = readb(&priv->regs->isr);
+	if (!(isr & priv->ier))
+		return IRQ_NONE;
+
+	if (isr & RCAR_CAN_ISR_ERSF)
+		rcar_can_error(ndev);
+
+	if (isr & RCAR_CAN_ISR_TXFF)
+		rcar_can_tx_done(ndev);
+
+	if (isr & RCAR_CAN_ISR_RXFF) {
+		if (napi_schedule_prep(&priv->napi)) {
+			/* Disable Rx FIFO interrupts */
+			priv->ier &= ~RCAR_CAN_IER_RXFIE;
+			writeb(priv->ier, &priv->regs->ier);
+			__napi_schedule(&priv->napi);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void rcar_can_set_bittiming(struct net_device *dev)
+{
+	struct rcar_can_priv *priv = netdev_priv(dev);
+	struct can_bittiming *bt = &priv->can.bittiming;
+	u32 bcr;
+
+	bcr = RCAR_CAN_BCR_TSEG1(bt->phase_seg1 + bt->prop_seg - 1) |
+	      RCAR_CAN_BCR_BPR(bt->brp - 1) | RCAR_CAN_BCR_SJW(bt->sjw - 1) |
+	      RCAR_CAN_BCR_TSEG2(bt->phase_seg2 - 1);
+	/* Don't overwrite CLKR with 32-bit BCR access; CLKR has 8-bit access.
+	 * All the registers are big-endian but they get byte-swapped on 32-bit
+	 * read/write (but not on 8-bit, contrary to the manuals)...
+	 */
+	writel((bcr << 8) | priv->clock_select, &priv->regs->bcr);
+}
+
+static void rcar_can_start(struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	u16 ctlr;
+	int i;
+
+	/* Set controller to known mode:
+	 * - FIFO mailbox mode
+	 * - accept all messages
+	 * - overrun mode
+	 * CAN is in sleep mode after MCU hardware or software reset.
+	 */
+	ctlr = readw(&priv->regs->ctlr);
+	ctlr &= ~RCAR_CAN_CTLR_SLPM;
+	writew(ctlr, &priv->regs->ctlr);
+	/* Go to reset mode */
+	ctlr |= RCAR_CAN_CTLR_CANM_FORCE_RESET;
+	writew(ctlr, &priv->regs->ctlr);
+	for (i = 0; i < MAX_STR_READS; i++) {
+		if (readw(&priv->regs->str) & RCAR_CAN_STR_RSTST)
+			break;
+	}
+	rcar_can_set_bittiming(ndev);
+	ctlr |= RCAR_CAN_CTLR_IDFM_MIXED; /* Select mixed ID mode */
+	ctlr |= RCAR_CAN_CTLR_BOM_ENT;	/* Entry to halt mode automatically */
+					/* at bus-off */
+	ctlr |= RCAR_CAN_CTLR_MBM;	/* Select FIFO mailbox mode */
+	ctlr |= RCAR_CAN_CTLR_MLM;	/* Overrun mode */
+	writew(ctlr, &priv->regs->ctlr);
+
+	/* Accept all SID and EID */
+	writel(0, &priv->regs->mkr_2_9[6]);
+	writel(0, &priv->regs->mkr_2_9[7]);
+	/* In FIFO mailbox mode, write "0" to bits 24 to 31 */
+	writel(0, &priv->regs->mkivlr1);
+	/* Accept all frames */
+	writel(0, &priv->regs->fidcr[0]);
+	writel(RCAR_CAN_FIDCR_IDE | RCAR_CAN_FIDCR_RTR, &priv->regs->fidcr[1]);
+	/* Enable and configure FIFO mailbox interrupts */
+	writel(RCAR_CAN_MIER1_RXFIE | RCAR_CAN_MIER1_TXFIE, &priv->regs->mier1);
+
+	priv->ier = RCAR_CAN_IER_ERSIE | RCAR_CAN_IER_RXFIE |
+		    RCAR_CAN_IER_TXFIE;
+	writeb(priv->ier, &priv->regs->ier);
+
+	/* Accumulate error codes */
+	writeb(RCAR_CAN_ECSR_EDPM, &priv->regs->ecsr);
+	/* Enable error interrupts */
+	writeb(RCAR_CAN_EIER_EWIE | RCAR_CAN_EIER_EPIE | RCAR_CAN_EIER_BOEIE |
+	       (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING ?
+	       RCAR_CAN_EIER_BEIE : 0) | RCAR_CAN_EIER_ORIE |
+	       RCAR_CAN_EIER_OLIE, &priv->regs->eier);
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	/* Go to operation mode */
+	writew(ctlr & ~RCAR_CAN_CTLR_CANM, &priv->regs->ctlr);
+	for (i = 0; i < MAX_STR_READS; i++) {
+		if (!(readw(&priv->regs->str) & RCAR_CAN_STR_RSTST))
+			break;
+	}
+	/* Enable Rx and Tx FIFO */
+	writeb(RCAR_CAN_RFCR_RFE, &priv->regs->rfcr);
+	writeb(RCAR_CAN_TFCR_TFE, &priv->regs->tfcr);
+}
+
+static int rcar_can_open(struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	int err;
+
+	err = clk_prepare_enable(priv->clk);
+	if (err) {
+		netdev_err(ndev,
+			   "failed to enable peripheral clock, error %d\n",
+			   err);
+		goto out;
+	}
+	err = clk_prepare_enable(priv->can_clk);
+	if (err) {
+		netdev_err(ndev, "failed to enable CAN clock, error %d\n",
+			   err);
+		goto out_clock;
+	}
+	err = open_candev(ndev);
+	if (err) {
+		netdev_err(ndev, "open_candev() failed, error %d\n", err);
+		goto out_can_clock;
+	}
+	napi_enable(&priv->napi);
+	err = request_irq(ndev->irq, rcar_can_interrupt, 0, ndev->name, ndev);
+	if (err) {
+		netdev_err(ndev, "request_irq(%d) failed, error %d\n",
+			   ndev->irq, err);
+		goto out_close;
+	}
+	rcar_can_start(ndev);
+	netif_start_queue(ndev);
+	return 0;
+out_close:
+	napi_disable(&priv->napi);
+	close_candev(ndev);
+out_can_clock:
+	clk_disable_unprepare(priv->can_clk);
+out_clock:
+	clk_disable_unprepare(priv->clk);
+out:
+	return err;
+}
+
+static void rcar_can_stop(struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	u16 ctlr;
+	int i;
+
+	/* Go to (force) reset mode */
+	ctlr = readw(&priv->regs->ctlr);
+	ctlr |= RCAR_CAN_CTLR_CANM_FORCE_RESET;
+	writew(ctlr, &priv->regs->ctlr);
+	for (i = 0; i < MAX_STR_READS; i++) {
+		if (readw(&priv->regs->str) & RCAR_CAN_STR_RSTST)
+			break;
+	}
+	writel(0, &priv->regs->mier0);
+	writel(0, &priv->regs->mier1);
+	writeb(0, &priv->regs->ier);
+	writeb(0, &priv->regs->eier);
+	/* Go to sleep mode */
+	ctlr |= RCAR_CAN_CTLR_SLPM;
+	writew(ctlr, &priv->regs->ctlr);
+	priv->can.state = CAN_STATE_STOPPED;
+}
+
+static int rcar_can_close(struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+
+	netif_stop_queue(ndev);
+	rcar_can_stop(ndev);
+	free_irq(ndev->irq, ndev);
+	napi_disable(&priv->napi);
+	clk_disable_unprepare(priv->can_clk);
+	clk_disable_unprepare(priv->clk);
+	close_candev(ndev);
+	return 0;
+}
+
+static netdev_tx_t rcar_can_start_xmit(struct sk_buff *skb,
+				       struct net_device *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	u32 data, i;
+
+	if (can_dev_dropped_skb(ndev, skb))
+		return NETDEV_TX_OK;
+
+	if (cf->can_id & CAN_EFF_FLAG)	/* Extended frame format */
+		data = (cf->can_id & CAN_EFF_MASK) | RCAR_CAN_IDE;
+	else				/* Standard frame format */
+		data = (cf->can_id & CAN_SFF_MASK) << RCAR_CAN_SID_SHIFT;
+
+	if (cf->can_id & CAN_RTR_FLAG) { /* Remote transmission request */
+		data |= RCAR_CAN_RTR;
+	} else {
+		for (i = 0; i < cf->len; i++)
+			writeb(cf->data[i],
+			       &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].data[i]);
+	}
+
+	writel(data, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].id);
+
+	writeb(cf->len, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].dlc);
+
+	can_put_echo_skb(skb, ndev, priv->tx_head % RCAR_CAN_FIFO_DEPTH, 0);
+	priv->tx_head++;
+	/* Start Tx: write 0xff to the TFPCR register to increment
+	 * the CPU-side pointer for the transmit FIFO to the next
+	 * mailbox location
+	 */
+	writeb(0xff, &priv->regs->tfpcr);
+	/* Stop the queue if we've filled all FIFO entries */
+	if (priv->tx_head - priv->tx_tail >= RCAR_CAN_FIFO_DEPTH)
+		netif_stop_queue(ndev);
+
+	return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops rcar_can_netdev_ops = {
+	.ndo_open = rcar_can_open,
+	.ndo_stop = rcar_can_close,
+	.ndo_start_xmit = rcar_can_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct ethtool_ops rcar_can_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
+static void rcar_can_rx_pkt(struct rcar_can_priv *priv)
+{
+	struct net_device_stats *stats = &priv->ndev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	u32 data;
+	u8 dlc;
+
+	skb = alloc_can_skb(priv->ndev, &cf);
+	if (!skb) {
+		stats->rx_dropped++;
+		return;
+	}
+
+	data = readl(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].id);
+	if (data & RCAR_CAN_IDE)
+		cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG;
+	else
+		cf->can_id = (data >> RCAR_CAN_SID_SHIFT) & CAN_SFF_MASK;
+
+	dlc = readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].dlc);
+	cf->len = can_cc_dlc2len(dlc);
+	if (data & RCAR_CAN_RTR) {
+		cf->can_id |= CAN_RTR_FLAG;
+	} else {
+		for (dlc = 0; dlc < cf->len; dlc++)
+			cf->data[dlc] =
+			readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].data[dlc]);
+
+		stats->rx_bytes += cf->len;
+	}
+	stats->rx_packets++;
+
+	netif_receive_skb(skb);
+}
+
+static int rcar_can_rx_poll(struct napi_struct *napi, int quota)
+{
+	struct rcar_can_priv *priv = container_of(napi,
+						  struct rcar_can_priv, napi);
+	int num_pkts;
+
+	for (num_pkts = 0; num_pkts < quota; num_pkts++) {
+		u8 rfcr, isr;
+
+		isr = readb(&priv->regs->isr);
+		/* Clear interrupt bit */
+		if (isr & RCAR_CAN_ISR_RXFF)
+			writeb(isr & ~RCAR_CAN_ISR_RXFF, &priv->regs->isr);
+		rfcr = readb(&priv->regs->rfcr);
+		if (rfcr & RCAR_CAN_RFCR_RFEST)
+			break;
+		rcar_can_rx_pkt(priv);
+		/* Write 0xff to the RFPCR register to increment
+		 * the CPU-side pointer for the receive FIFO
+		 * to the next mailbox location
+		 */
+		writeb(0xff, &priv->regs->rfpcr);
+	}
+	/* All packets processed */
+	if (num_pkts < quota) {
+		napi_complete_done(napi, num_pkts);
+		priv->ier |= RCAR_CAN_IER_RXFIE;
+		writeb(priv->ier, &priv->regs->ier);
+	}
+	return num_pkts;
+}
+
+static int rcar_can_do_set_mode(struct net_device *ndev, enum can_mode mode)
+{
+	switch (mode) {
+	case CAN_MODE_START:
+		rcar_can_start(ndev);
+		netif_wake_queue(ndev);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int rcar_can_get_berr_counter(const struct net_device *dev,
+				     struct can_berr_counter *bec)
+{
+	struct rcar_can_priv *priv = netdev_priv(dev);
+	int err;
+
+	err = clk_prepare_enable(priv->clk);
+	if (err)
+		return err;
+	bec->txerr = readb(&priv->regs->tecr);
+	bec->rxerr = readb(&priv->regs->recr);
+	clk_disable_unprepare(priv->clk);
+	return 0;
+}
+
+static const char * const clock_names[] = {
+	[CLKR_CLKP1]	= "clkp1",
+	[CLKR_CLKP2]	= "clkp2",
+	[CLKR_CLKEXT]	= "can_clk",
+};
+
+static int rcar_can_probe(struct platform_device *pdev)
+{
+	struct rcar_can_priv *priv;
+	struct net_device *ndev;
+	void __iomem *addr;
+	u32 clock_select = CLKR_CLKP1;
+	int err = -ENODEV;
+	int irq;
+
+	of_property_read_u32(pdev->dev.of_node, "renesas,can-clock-select",
+			     &clock_select);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		err = irq;
+		goto fail;
+	}
+
+	addr = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(addr)) {
+		err = PTR_ERR(addr);
+		goto fail;
+	}
+
+	ndev = alloc_candev(sizeof(struct rcar_can_priv), RCAR_CAN_FIFO_DEPTH);
+	if (!ndev) {
+		dev_err(&pdev->dev, "alloc_candev() failed\n");
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	priv = netdev_priv(ndev);
+
+	priv->clk = devm_clk_get(&pdev->dev, "clkp1");
+	if (IS_ERR(priv->clk)) {
+		err = PTR_ERR(priv->clk);
+		dev_err(&pdev->dev, "cannot get peripheral clock, error %d\n",
+			err);
+		goto fail_clk;
+	}
+
+	if (!(BIT(clock_select) & RCAR_SUPPORTED_CLOCKS)) {
+		err = -EINVAL;
+		dev_err(&pdev->dev, "invalid CAN clock selected\n");
+		goto fail_clk;
+	}
+	priv->can_clk = devm_clk_get(&pdev->dev, clock_names[clock_select]);
+	if (IS_ERR(priv->can_clk)) {
+		err = PTR_ERR(priv->can_clk);
+		dev_err(&pdev->dev, "cannot get CAN clock, error %d\n", err);
+		goto fail_clk;
+	}
+
+	ndev->netdev_ops = &rcar_can_netdev_ops;
+	ndev->ethtool_ops = &rcar_can_ethtool_ops;
+	ndev->irq = irq;
+	ndev->flags |= IFF_ECHO;
+	priv->ndev = ndev;
+	priv->regs = addr;
+	priv->clock_select = clock_select;
+	priv->can.clock.freq = clk_get_rate(priv->can_clk);
+	priv->can.bittiming_const = &rcar_can_bittiming_const;
+	priv->can.do_set_mode = rcar_can_do_set_mode;
+	priv->can.do_get_berr_counter = rcar_can_get_berr_counter;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING;
+	platform_set_drvdata(pdev, ndev);
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+
+	netif_napi_add_weight(ndev, &priv->napi, rcar_can_rx_poll,
+			      RCAR_CAN_NAPI_WEIGHT);
+	err = register_candev(ndev);
+	if (err) {
+		dev_err(&pdev->dev, "register_candev() failed, error %d\n",
+			err);
+		goto fail_candev;
+	}
+
+	dev_info(&pdev->dev, "device registered (IRQ%d)\n", ndev->irq);
+
+	return 0;
+fail_candev:
+	netif_napi_del(&priv->napi);
+fail_clk:
+	free_candev(ndev);
+fail:
+	return err;
+}
+
+static int rcar_can_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+
+	unregister_candev(ndev);
+	netif_napi_del(&priv->napi);
+	free_candev(ndev);
+	return 0;
+}
+
+static int __maybe_unused rcar_can_suspend(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	u16 ctlr;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	netif_stop_queue(ndev);
+	netif_device_detach(ndev);
+
+	ctlr = readw(&priv->regs->ctlr);
+	ctlr |= RCAR_CAN_CTLR_CANM_HALT;
+	writew(ctlr, &priv->regs->ctlr);
+	ctlr |= RCAR_CAN_CTLR_SLPM;
+	writew(ctlr, &priv->regs->ctlr);
+	priv->can.state = CAN_STATE_SLEEPING;
+
+	clk_disable(priv->clk);
+	return 0;
+}
+
+static int __maybe_unused rcar_can_resume(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	u16 ctlr;
+	int err;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	err = clk_enable(priv->clk);
+	if (err) {
+		netdev_err(ndev, "clk_enable() failed, error %d\n", err);
+		return err;
+	}
+
+	ctlr = readw(&priv->regs->ctlr);
+	ctlr &= ~RCAR_CAN_CTLR_SLPM;
+	writew(ctlr, &priv->regs->ctlr);
+	ctlr &= ~RCAR_CAN_CTLR_CANM;
+	writew(ctlr, &priv->regs->ctlr);
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	netif_device_attach(ndev);
+	netif_start_queue(ndev);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_can_pm_ops, rcar_can_suspend, rcar_can_resume);
+
+static const struct of_device_id rcar_can_of_table[] __maybe_unused = {
+	{ .compatible = "renesas,can-r8a7778" },
+	{ .compatible = "renesas,can-r8a7779" },
+	{ .compatible = "renesas,can-r8a7790" },
+	{ .compatible = "renesas,can-r8a7791" },
+	{ .compatible = "renesas,rcar-gen1-can" },
+	{ .compatible = "renesas,rcar-gen2-can" },
+	{ .compatible = "renesas,rcar-gen3-can" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rcar_can_of_table);
+
+static struct platform_driver rcar_can_driver = {
+	.driver = {
+		.name = RCAR_CAN_DRV_NAME,
+		.of_match_table = of_match_ptr(rcar_can_of_table),
+		.pm = &rcar_can_pm_ops,
+	},
+	.probe = rcar_can_probe,
+	.remove = rcar_can_remove,
+};
+
+module_platform_driver(rcar_can_driver);
+
+MODULE_AUTHOR("Cogent Embedded, Inc.");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CAN driver for Renesas R-Car SoC");
+MODULE_ALIAS("platform:" RCAR_CAN_DRV_NAME);
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
new file mode 100644
index 000000000..e68291697
--- /dev/null
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -0,0 +1,2108 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Renesas R-Car CAN FD device driver
+ *
+ * Copyright (C) 2015 Renesas Electronics Corp.
+ */
+
+/* The R-Car CAN FD controller can operate in either one of the below two modes
+ *  - CAN FD only mode
+ *  - Classical CAN (CAN 2.0) only mode
+ *
+ * This driver puts the controller in CAN FD only mode by default. In this
+ * mode, the controller acts as a CAN FD node that can also interoperate with
+ * CAN 2.0 nodes.
+ *
+ * To switch the controller to Classical CAN (CAN 2.0) only mode, add
+ * "renesas,no-can-fd" optional property to the device tree node. A h/w reset is
+ * also required to switch modes.
+ *
+ * Note: The h/w manual register naming convention is clumsy and not acceptable
+ * to use as it is in the driver. However, those names are added as comments
+ * wherever it is modified to a readable name.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/ethtool.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/can/dev.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/iopoll.h>
+#include <linux/reset.h>
+
+#define RCANFD_DRV_NAME			"rcar_canfd"
+
+enum rcanfd_chip_id {
+	RENESAS_RCAR_GEN3 = 0,
+	RENESAS_RZG2L,
+	RENESAS_R8A779A0,
+};
+
+/* Global register bits */
+
+/* RSCFDnCFDGRMCFG */
+#define RCANFD_GRMCFG_RCMC		BIT(0)
+
+/* RSCFDnCFDGCFG / RSCFDnGCFG */
+#define RCANFD_GCFG_EEFE		BIT(6)
+#define RCANFD_GCFG_CMPOC		BIT(5)	/* CAN FD only */
+#define RCANFD_GCFG_DCS			BIT(4)
+#define RCANFD_GCFG_DCE			BIT(1)
+#define RCANFD_GCFG_TPRI		BIT(0)
+
+/* RSCFDnCFDGCTR / RSCFDnGCTR */
+#define RCANFD_GCTR_TSRST		BIT(16)
+#define RCANFD_GCTR_CFMPOFIE		BIT(11)	/* CAN FD only */
+#define RCANFD_GCTR_THLEIE		BIT(10)
+#define RCANFD_GCTR_MEIE		BIT(9)
+#define RCANFD_GCTR_DEIE		BIT(8)
+#define RCANFD_GCTR_GSLPR		BIT(2)
+#define RCANFD_GCTR_GMDC_MASK		(0x3)
+#define RCANFD_GCTR_GMDC_GOPM		(0x0)
+#define RCANFD_GCTR_GMDC_GRESET		(0x1)
+#define RCANFD_GCTR_GMDC_GTEST		(0x2)
+
+/* RSCFDnCFDGSTS / RSCFDnGSTS */
+#define RCANFD_GSTS_GRAMINIT		BIT(3)
+#define RCANFD_GSTS_GSLPSTS		BIT(2)
+#define RCANFD_GSTS_GHLTSTS		BIT(1)
+#define RCANFD_GSTS_GRSTSTS		BIT(0)
+/* Non-operational status */
+#define RCANFD_GSTS_GNOPM		(BIT(0) | BIT(1) | BIT(2) | BIT(3))
+
+/* RSCFDnCFDGERFL / RSCFDnGERFL */
+#define RCANFD_GERFL_EEF0_7		GENMASK(23, 16)
+#define RCANFD_GERFL_EEF(ch)		BIT(16 + (ch))
+#define RCANFD_GERFL_CMPOF		BIT(3)	/* CAN FD only */
+#define RCANFD_GERFL_THLES		BIT(2)
+#define RCANFD_GERFL_MES		BIT(1)
+#define RCANFD_GERFL_DEF		BIT(0)
+
+#define RCANFD_GERFL_ERR(gpriv, x) \
+	((x) & (reg_v3u(gpriv, RCANFD_GERFL_EEF0_7, \
+			RCANFD_GERFL_EEF(0) | RCANFD_GERFL_EEF(1)) | \
+		RCANFD_GERFL_MES | \
+		((gpriv)->fdmode ? RCANFD_GERFL_CMPOF : 0)))
+
+/* AFL Rx rules registers */
+
+/* RSCFDnCFDGAFLCFG0 / RSCFDnGAFLCFG0 */
+#define RCANFD_GAFLCFG_SETRNC(gpriv, n, x) \
+	(((x) & reg_v3u(gpriv, 0x1ff, 0xff)) << \
+	 (reg_v3u(gpriv, 16, 24) - ((n) & 1) * reg_v3u(gpriv, 16, 8)))
+
+#define RCANFD_GAFLCFG_GETRNC(gpriv, n, x) \
+	(((x) >> (reg_v3u(gpriv, 16, 24) - ((n) & 1) * reg_v3u(gpriv, 16, 8))) & \
+	 reg_v3u(gpriv, 0x1ff, 0xff))
+
+/* RSCFDnCFDGAFLECTR / RSCFDnGAFLECTR */
+#define RCANFD_GAFLECTR_AFLDAE		BIT(8)
+#define RCANFD_GAFLECTR_AFLPN(gpriv, x)	((x) & reg_v3u(gpriv, 0x7f, 0x1f))
+
+/* RSCFDnCFDGAFLIDj / RSCFDnGAFLIDj */
+#define RCANFD_GAFLID_GAFLLB		BIT(29)
+
+/* RSCFDnCFDGAFLP1_j / RSCFDnGAFLP1_j */
+#define RCANFD_GAFLP1_GAFLFDP(x)	(1 << (x))
+
+/* Channel register bits */
+
+/* RSCFDnCmCFG - Classical CAN only */
+#define RCANFD_CFG_SJW(x)		(((x) & 0x3) << 24)
+#define RCANFD_CFG_TSEG2(x)		(((x) & 0x7) << 20)
+#define RCANFD_CFG_TSEG1(x)		(((x) & 0xf) << 16)
+#define RCANFD_CFG_BRP(x)		(((x) & 0x3ff) << 0)
+
+/* RSCFDnCFDCmNCFG - CAN FD only */
+#define RCANFD_NCFG_NTSEG2(gpriv, x) \
+	(((x) & reg_v3u(gpriv, 0x7f, 0x1f)) << reg_v3u(gpriv, 25, 24))
+
+#define RCANFD_NCFG_NTSEG1(gpriv, x) \
+	(((x) & reg_v3u(gpriv, 0xff, 0x7f)) << reg_v3u(gpriv, 17, 16))
+
+#define RCANFD_NCFG_NSJW(gpriv, x) \
+	(((x) & reg_v3u(gpriv, 0x7f, 0x1f)) << reg_v3u(gpriv, 10, 11))
+
+#define RCANFD_NCFG_NBRP(x)		(((x) & 0x3ff) << 0)
+
+/* RSCFDnCFDCmCTR / RSCFDnCmCTR */
+#define RCANFD_CCTR_CTME		BIT(24)
+#define RCANFD_CCTR_ERRD		BIT(23)
+#define RCANFD_CCTR_BOM_MASK		(0x3 << 21)
+#define RCANFD_CCTR_BOM_ISO		(0x0 << 21)
+#define RCANFD_CCTR_BOM_BENTRY		(0x1 << 21)
+#define RCANFD_CCTR_BOM_BEND		(0x2 << 21)
+#define RCANFD_CCTR_TDCVFIE		BIT(19)
+#define RCANFD_CCTR_SOCOIE		BIT(18)
+#define RCANFD_CCTR_EOCOIE		BIT(17)
+#define RCANFD_CCTR_TAIE		BIT(16)
+#define RCANFD_CCTR_ALIE		BIT(15)
+#define RCANFD_CCTR_BLIE		BIT(14)
+#define RCANFD_CCTR_OLIE		BIT(13)
+#define RCANFD_CCTR_BORIE		BIT(12)
+#define RCANFD_CCTR_BOEIE		BIT(11)
+#define RCANFD_CCTR_EPIE		BIT(10)
+#define RCANFD_CCTR_EWIE		BIT(9)
+#define RCANFD_CCTR_BEIE		BIT(8)
+#define RCANFD_CCTR_CSLPR		BIT(2)
+#define RCANFD_CCTR_CHMDC_MASK		(0x3)
+#define RCANFD_CCTR_CHDMC_COPM		(0x0)
+#define RCANFD_CCTR_CHDMC_CRESET	(0x1)
+#define RCANFD_CCTR_CHDMC_CHLT		(0x2)
+
+/* RSCFDnCFDCmSTS / RSCFDnCmSTS */
+#define RCANFD_CSTS_COMSTS		BIT(7)
+#define RCANFD_CSTS_RECSTS		BIT(6)
+#define RCANFD_CSTS_TRMSTS		BIT(5)
+#define RCANFD_CSTS_BOSTS		BIT(4)
+#define RCANFD_CSTS_EPSTS		BIT(3)
+#define RCANFD_CSTS_SLPSTS		BIT(2)
+#define RCANFD_CSTS_HLTSTS		BIT(1)
+#define RCANFD_CSTS_CRSTSTS		BIT(0)
+
+#define RCANFD_CSTS_TECCNT(x)		(((x) >> 24) & 0xff)
+#define RCANFD_CSTS_RECCNT(x)		(((x) >> 16) & 0xff)
+
+/* RSCFDnCFDCmERFL / RSCFDnCmERFL */
+#define RCANFD_CERFL_ADERR		BIT(14)
+#define RCANFD_CERFL_B0ERR		BIT(13)
+#define RCANFD_CERFL_B1ERR		BIT(12)
+#define RCANFD_CERFL_CERR		BIT(11)
+#define RCANFD_CERFL_AERR		BIT(10)
+#define RCANFD_CERFL_FERR		BIT(9)
+#define RCANFD_CERFL_SERR		BIT(8)
+#define RCANFD_CERFL_ALF		BIT(7)
+#define RCANFD_CERFL_BLF		BIT(6)
+#define RCANFD_CERFL_OVLF		BIT(5)
+#define RCANFD_CERFL_BORF		BIT(4)
+#define RCANFD_CERFL_BOEF		BIT(3)
+#define RCANFD_CERFL_EPF		BIT(2)
+#define RCANFD_CERFL_EWF		BIT(1)
+#define RCANFD_CERFL_BEF		BIT(0)
+
+#define RCANFD_CERFL_ERR(x)		((x) & (0x7fff)) /* above bits 14:0 */
+
+/* RSCFDnCFDCmDCFG */
+#define RCANFD_DCFG_DSJW(x)		(((x) & 0x7) << 24)
+
+#define RCANFD_DCFG_DTSEG2(gpriv, x) \
+	(((x) & reg_v3u(gpriv, 0x0f, 0x7)) << reg_v3u(gpriv, 16, 20))
+
+#define RCANFD_DCFG_DTSEG1(gpriv, x) \
+	(((x) & reg_v3u(gpriv, 0x1f, 0xf)) << reg_v3u(gpriv, 8, 16))
+
+#define RCANFD_DCFG_DBRP(x)		(((x) & 0xff) << 0)
+
+/* RSCFDnCFDCmFDCFG */
+#define RCANFD_FDCFG_CLOE		BIT(30)
+#define RCANFD_FDCFG_FDOE		BIT(28)
+#define RCANFD_FDCFG_TDCE		BIT(9)
+#define RCANFD_FDCFG_TDCOC		BIT(8)
+#define RCANFD_FDCFG_TDCO(x)		(((x) & 0x7f) >> 16)
+
+/* RSCFDnCFDRFCCx */
+#define RCANFD_RFCC_RFIM		BIT(12)
+#define RCANFD_RFCC_RFDC(x)		(((x) & 0x7) << 8)
+#define RCANFD_RFCC_RFPLS(x)		(((x) & 0x7) << 4)
+#define RCANFD_RFCC_RFIE		BIT(1)
+#define RCANFD_RFCC_RFE			BIT(0)
+
+/* RSCFDnCFDRFSTSx */
+#define RCANFD_RFSTS_RFIF		BIT(3)
+#define RCANFD_RFSTS_RFMLT		BIT(2)
+#define RCANFD_RFSTS_RFFLL		BIT(1)
+#define RCANFD_RFSTS_RFEMP		BIT(0)
+
+/* RSCFDnCFDRFIDx */
+#define RCANFD_RFID_RFIDE		BIT(31)
+#define RCANFD_RFID_RFRTR		BIT(30)
+
+/* RSCFDnCFDRFPTRx */
+#define RCANFD_RFPTR_RFDLC(x)		(((x) >> 28) & 0xf)
+#define RCANFD_RFPTR_RFPTR(x)		(((x) >> 16) & 0xfff)
+#define RCANFD_RFPTR_RFTS(x)		(((x) >> 0) & 0xffff)
+
+/* RSCFDnCFDRFFDSTSx */
+#define RCANFD_RFFDSTS_RFFDF		BIT(2)
+#define RCANFD_RFFDSTS_RFBRS		BIT(1)
+#define RCANFD_RFFDSTS_RFESI		BIT(0)
+
+/* Common FIFO bits */
+
+/* RSCFDnCFDCFCCk */
+#define RCANFD_CFCC_CFTML(gpriv, x)	(((x) & 0xf) << reg_v3u(gpriv, 16, 20))
+#define RCANFD_CFCC_CFM(gpriv, x)	(((x) & 0x3) << reg_v3u(gpriv,  8, 16))
+#define RCANFD_CFCC_CFIM		BIT(12)
+#define RCANFD_CFCC_CFDC(gpriv, x)	(((x) & 0x7) << reg_v3u(gpriv, 21,  8))
+#define RCANFD_CFCC_CFPLS(x)		(((x) & 0x7) << 4)
+#define RCANFD_CFCC_CFTXIE		BIT(2)
+#define RCANFD_CFCC_CFE			BIT(0)
+
+/* RSCFDnCFDCFSTSk */
+#define RCANFD_CFSTS_CFMC(x)		(((x) >> 8) & 0xff)
+#define RCANFD_CFSTS_CFTXIF		BIT(4)
+#define RCANFD_CFSTS_CFMLT		BIT(2)
+#define RCANFD_CFSTS_CFFLL		BIT(1)
+#define RCANFD_CFSTS_CFEMP		BIT(0)
+
+/* RSCFDnCFDCFIDk */
+#define RCANFD_CFID_CFIDE		BIT(31)
+#define RCANFD_CFID_CFRTR		BIT(30)
+#define RCANFD_CFID_CFID_MASK(x)	((x) & 0x1fffffff)
+
+/* RSCFDnCFDCFPTRk */
+#define RCANFD_CFPTR_CFDLC(x)		(((x) & 0xf) << 28)
+#define RCANFD_CFPTR_CFPTR(x)		(((x) & 0xfff) << 16)
+#define RCANFD_CFPTR_CFTS(x)		(((x) & 0xff) << 0)
+
+/* RSCFDnCFDCFFDCSTSk */
+#define RCANFD_CFFDCSTS_CFFDF		BIT(2)
+#define RCANFD_CFFDCSTS_CFBRS		BIT(1)
+#define RCANFD_CFFDCSTS_CFESI		BIT(0)
+
+/* This controller supports either Classical CAN only mode or CAN FD only mode.
+ * These modes are supported in two separate set of register maps & names.
+ * However, some of the register offsets are common for both modes. Those
+ * offsets are listed below as Common registers.
+ *
+ * The CAN FD only mode specific registers & Classical CAN only mode specific
+ * registers are listed separately. Their register names starts with
+ * RCANFD_F_xxx & RCANFD_C_xxx respectively.
+ */
+
+/* Common registers */
+
+/* RSCFDnCFDCmNCFG / RSCFDnCmCFG */
+#define RCANFD_CCFG(m)			(0x0000 + (0x10 * (m)))
+/* RSCFDnCFDCmCTR / RSCFDnCmCTR */
+#define RCANFD_CCTR(m)			(0x0004 + (0x10 * (m)))
+/* RSCFDnCFDCmSTS / RSCFDnCmSTS */
+#define RCANFD_CSTS(m)			(0x0008 + (0x10 * (m)))
+/* RSCFDnCFDCmERFL / RSCFDnCmERFL */
+#define RCANFD_CERFL(m)			(0x000C + (0x10 * (m)))
+
+/* RSCFDnCFDGCFG / RSCFDnGCFG */
+#define RCANFD_GCFG			(0x0084)
+/* RSCFDnCFDGCTR / RSCFDnGCTR */
+#define RCANFD_GCTR			(0x0088)
+/* RSCFDnCFDGCTS / RSCFDnGCTS */
+#define RCANFD_GSTS			(0x008c)
+/* RSCFDnCFDGERFL / RSCFDnGERFL */
+#define RCANFD_GERFL			(0x0090)
+/* RSCFDnCFDGTSC / RSCFDnGTSC */
+#define RCANFD_GTSC			(0x0094)
+/* RSCFDnCFDGAFLECTR / RSCFDnGAFLECTR */
+#define RCANFD_GAFLECTR			(0x0098)
+/* RSCFDnCFDGAFLCFG / RSCFDnGAFLCFG */
+#define RCANFD_GAFLCFG(ch)		(0x009c + (0x04 * ((ch) / 2)))
+/* RSCFDnCFDRMNB / RSCFDnRMNB */
+#define RCANFD_RMNB			(0x00a4)
+/* RSCFDnCFDRMND / RSCFDnRMND */
+#define RCANFD_RMND(y)			(0x00a8 + (0x04 * (y)))
+
+/* RSCFDnCFDRFCCx / RSCFDnRFCCx */
+#define RCANFD_RFCC(gpriv, x)		(reg_v3u(gpriv, 0x00c0, 0x00b8) + (0x04 * (x)))
+/* RSCFDnCFDRFSTSx / RSCFDnRFSTSx */
+#define RCANFD_RFSTS(gpriv, x)		(RCANFD_RFCC(gpriv, x) + 0x20)
+/* RSCFDnCFDRFPCTRx / RSCFDnRFPCTRx */
+#define RCANFD_RFPCTR(gpriv, x)		(RCANFD_RFCC(gpriv, x) + 0x40)
+
+/* Common FIFO Control registers */
+
+/* RSCFDnCFDCFCCx / RSCFDnCFCCx */
+#define RCANFD_CFCC(gpriv, ch, idx) \
+	(reg_v3u(gpriv, 0x0120, 0x0118) + (0x0c * (ch)) + (0x04 * (idx)))
+/* RSCFDnCFDCFSTSx / RSCFDnCFSTSx */
+#define RCANFD_CFSTS(gpriv, ch, idx) \
+	(reg_v3u(gpriv, 0x01e0, 0x0178) + (0x0c * (ch)) + (0x04 * (idx)))
+/* RSCFDnCFDCFPCTRx / RSCFDnCFPCTRx */
+#define RCANFD_CFPCTR(gpriv, ch, idx) \
+	(reg_v3u(gpriv, 0x0240, 0x01d8) + (0x0c * (ch)) + (0x04 * (idx)))
+
+/* RSCFDnCFDFESTS / RSCFDnFESTS */
+#define RCANFD_FESTS			(0x0238)
+/* RSCFDnCFDFFSTS / RSCFDnFFSTS */
+#define RCANFD_FFSTS			(0x023c)
+/* RSCFDnCFDFMSTS / RSCFDnFMSTS */
+#define RCANFD_FMSTS			(0x0240)
+/* RSCFDnCFDRFISTS / RSCFDnRFISTS */
+#define RCANFD_RFISTS			(0x0244)
+/* RSCFDnCFDCFRISTS / RSCFDnCFRISTS */
+#define RCANFD_CFRISTS			(0x0248)
+/* RSCFDnCFDCFTISTS / RSCFDnCFTISTS */
+#define RCANFD_CFTISTS			(0x024c)
+
+/* RSCFDnCFDTMCp / RSCFDnTMCp */
+#define RCANFD_TMC(p)			(0x0250 + (0x01 * (p)))
+/* RSCFDnCFDTMSTSp / RSCFDnTMSTSp */
+#define RCANFD_TMSTS(p)			(0x02d0 + (0x01 * (p)))
+
+/* RSCFDnCFDTMTRSTSp / RSCFDnTMTRSTSp */
+#define RCANFD_TMTRSTS(y)		(0x0350 + (0x04 * (y)))
+/* RSCFDnCFDTMTARSTSp / RSCFDnTMTARSTSp */
+#define RCANFD_TMTARSTS(y)		(0x0360 + (0x04 * (y)))
+/* RSCFDnCFDTMTCSTSp / RSCFDnTMTCSTSp */
+#define RCANFD_TMTCSTS(y)		(0x0370 + (0x04 * (y)))
+/* RSCFDnCFDTMTASTSp / RSCFDnTMTASTSp */
+#define RCANFD_TMTASTS(y)		(0x0380 + (0x04 * (y)))
+/* RSCFDnCFDTMIECy / RSCFDnTMIECy */
+#define RCANFD_TMIEC(y)			(0x0390 + (0x04 * (y)))
+
+/* RSCFDnCFDTXQCCm / RSCFDnTXQCCm */
+#define RCANFD_TXQCC(m)			(0x03a0 + (0x04 * (m)))
+/* RSCFDnCFDTXQSTSm / RSCFDnTXQSTSm */
+#define RCANFD_TXQSTS(m)		(0x03c0 + (0x04 * (m)))
+/* RSCFDnCFDTXQPCTRm / RSCFDnTXQPCTRm */
+#define RCANFD_TXQPCTR(m)		(0x03e0 + (0x04 * (m)))
+
+/* RSCFDnCFDTHLCCm / RSCFDnTHLCCm */
+#define RCANFD_THLCC(m)			(0x0400 + (0x04 * (m)))
+/* RSCFDnCFDTHLSTSm / RSCFDnTHLSTSm */
+#define RCANFD_THLSTS(m)		(0x0420 + (0x04 * (m)))
+/* RSCFDnCFDTHLPCTRm / RSCFDnTHLPCTRm */
+#define RCANFD_THLPCTR(m)		(0x0440 + (0x04 * (m)))
+
+/* RSCFDnCFDGTINTSTS0 / RSCFDnGTINTSTS0 */
+#define RCANFD_GTINTSTS0		(0x0460)
+/* RSCFDnCFDGTINTSTS1 / RSCFDnGTINTSTS1 */
+#define RCANFD_GTINTSTS1		(0x0464)
+/* RSCFDnCFDGTSTCFG / RSCFDnGTSTCFG */
+#define RCANFD_GTSTCFG			(0x0468)
+/* RSCFDnCFDGTSTCTR / RSCFDnGTSTCTR */
+#define RCANFD_GTSTCTR			(0x046c)
+/* RSCFDnCFDGLOCKK / RSCFDnGLOCKK */
+#define RCANFD_GLOCKK			(0x047c)
+/* RSCFDnCFDGRMCFG */
+#define RCANFD_GRMCFG			(0x04fc)
+
+/* RSCFDnCFDGAFLIDj / RSCFDnGAFLIDj */
+#define RCANFD_GAFLID(offset, j)	((offset) + (0x10 * (j)))
+/* RSCFDnCFDGAFLMj / RSCFDnGAFLMj */
+#define RCANFD_GAFLM(offset, j)		((offset) + 0x04 + (0x10 * (j)))
+/* RSCFDnCFDGAFLP0j / RSCFDnGAFLP0j */
+#define RCANFD_GAFLP0(offset, j)	((offset) + 0x08 + (0x10 * (j)))
+/* RSCFDnCFDGAFLP1j / RSCFDnGAFLP1j */
+#define RCANFD_GAFLP1(offset, j)	((offset) + 0x0c + (0x10 * (j)))
+
+/* Classical CAN only mode register map */
+
+/* RSCFDnGAFLXXXj offset */
+#define RCANFD_C_GAFL_OFFSET		(0x0500)
+
+/* RSCFDnRMXXXq -> RCANFD_C_RMXXX(q) */
+#define RCANFD_C_RMID(q)		(0x0600 + (0x10 * (q)))
+#define RCANFD_C_RMPTR(q)		(0x0604 + (0x10 * (q)))
+#define RCANFD_C_RMDF0(q)		(0x0608 + (0x10 * (q)))
+#define RCANFD_C_RMDF1(q)		(0x060c + (0x10 * (q)))
+
+/* RSCFDnRFXXx -> RCANFD_C_RFXX(x) */
+#define RCANFD_C_RFOFFSET	(0x0e00)
+#define RCANFD_C_RFID(x)	(RCANFD_C_RFOFFSET + (0x10 * (x)))
+#define RCANFD_C_RFPTR(x)	(RCANFD_C_RFOFFSET + 0x04 + (0x10 * (x)))
+#define RCANFD_C_RFDF(x, df) \
+		(RCANFD_C_RFOFFSET + 0x08 + (0x10 * (x)) + (0x04 * (df)))
+
+/* RSCFDnCFXXk -> RCANFD_C_CFXX(ch, k) */
+#define RCANFD_C_CFOFFSET		(0x0e80)
+
+#define RCANFD_C_CFID(ch, idx) \
+	(RCANFD_C_CFOFFSET + (0x30 * (ch)) + (0x10 * (idx)))
+
+#define RCANFD_C_CFPTR(ch, idx)	\
+	(RCANFD_C_CFOFFSET + 0x04 + (0x30 * (ch)) + (0x10 * (idx)))
+
+#define RCANFD_C_CFDF(ch, idx, df) \
+	(RCANFD_C_CFOFFSET + 0x08 + (0x30 * (ch)) + (0x10 * (idx)) + (0x04 * (df)))
+
+/* RSCFDnTMXXp -> RCANFD_C_TMXX(p) */
+#define RCANFD_C_TMID(p)		(0x1000 + (0x10 * (p)))
+#define RCANFD_C_TMPTR(p)		(0x1004 + (0x10 * (p)))
+#define RCANFD_C_TMDF0(p)		(0x1008 + (0x10 * (p)))
+#define RCANFD_C_TMDF1(p)		(0x100c + (0x10 * (p)))
+
+/* RSCFDnTHLACCm */
+#define RCANFD_C_THLACC(m)		(0x1800 + (0x04 * (m)))
+/* RSCFDnRPGACCr */
+#define RCANFD_C_RPGACC(r)		(0x1900 + (0x04 * (r)))
+
+/* R-Car V3U Classical and CAN FD mode specific register map */
+#define RCANFD_V3U_CFDCFG		(0x1314)
+#define RCANFD_V3U_DCFG(m)		(0x1400 + (0x20 * (m)))
+
+#define RCANFD_V3U_GAFL_OFFSET		(0x1800)
+
+/* CAN FD mode specific register map */
+
+/* RSCFDnCFDCmXXX -> RCANFD_F_XXX(m) */
+#define RCANFD_F_DCFG(m)		(0x0500 + (0x20 * (m)))
+#define RCANFD_F_CFDCFG(m)		(0x0504 + (0x20 * (m)))
+#define RCANFD_F_CFDCTR(m)		(0x0508 + (0x20 * (m)))
+#define RCANFD_F_CFDSTS(m)		(0x050c + (0x20 * (m)))
+#define RCANFD_F_CFDCRC(m)		(0x0510 + (0x20 * (m)))
+
+/* RSCFDnCFDGAFLXXXj offset */
+#define RCANFD_F_GAFL_OFFSET		(0x1000)
+
+/* RSCFDnCFDRMXXXq -> RCANFD_F_RMXXX(q) */
+#define RCANFD_F_RMID(q)		(0x2000 + (0x20 * (q)))
+#define RCANFD_F_RMPTR(q)		(0x2004 + (0x20 * (q)))
+#define RCANFD_F_RMFDSTS(q)		(0x2008 + (0x20 * (q)))
+#define RCANFD_F_RMDF(q, b)		(0x200c + (0x04 * (b)) + (0x20 * (q)))
+
+/* RSCFDnCFDRFXXx -> RCANFD_F_RFXX(x) */
+#define RCANFD_F_RFOFFSET(gpriv)	reg_v3u(gpriv, 0x6000, 0x3000)
+#define RCANFD_F_RFID(gpriv, x)		(RCANFD_F_RFOFFSET(gpriv) + (0x80 * (x)))
+#define RCANFD_F_RFPTR(gpriv, x)	(RCANFD_F_RFOFFSET(gpriv) + 0x04 + (0x80 * (x)))
+#define RCANFD_F_RFFDSTS(gpriv, x)	(RCANFD_F_RFOFFSET(gpriv) + 0x08 + (0x80 * (x)))
+#define RCANFD_F_RFDF(gpriv, x, df) \
+	(RCANFD_F_RFOFFSET(gpriv) + 0x0c + (0x80 * (x)) + (0x04 * (df)))
+
+/* RSCFDnCFDCFXXk -> RCANFD_F_CFXX(ch, k) */
+#define RCANFD_F_CFOFFSET(gpriv)	reg_v3u(gpriv, 0x6400, 0x3400)
+
+#define RCANFD_F_CFID(gpriv, ch, idx) \
+	(RCANFD_F_CFOFFSET(gpriv) + (0x180 * (ch)) + (0x80 * (idx)))
+
+#define RCANFD_F_CFPTR(gpriv, ch, idx) \
+	(RCANFD_F_CFOFFSET(gpriv) + 0x04 + (0x180 * (ch)) + (0x80 * (idx)))
+
+#define RCANFD_F_CFFDCSTS(gpriv, ch, idx) \
+	(RCANFD_F_CFOFFSET(gpriv) + 0x08 + (0x180 * (ch)) + (0x80 * (idx)))
+
+#define RCANFD_F_CFDF(gpriv, ch, idx, df) \
+	(RCANFD_F_CFOFFSET(gpriv) + 0x0c + (0x180 * (ch)) + (0x80 * (idx)) + \
+	 (0x04 * (df)))
+
+/* RSCFDnCFDTMXXp -> RCANFD_F_TMXX(p) */
+#define RCANFD_F_TMID(p)		(0x4000 + (0x20 * (p)))
+#define RCANFD_F_TMPTR(p)		(0x4004 + (0x20 * (p)))
+#define RCANFD_F_TMFDCTR(p)		(0x4008 + (0x20 * (p)))
+#define RCANFD_F_TMDF(p, b)		(0x400c + (0x20 * (p)) + (0x04 * (b)))
+
+/* RSCFDnCFDTHLACCm */
+#define RCANFD_F_THLACC(m)		(0x6000 + (0x04 * (m)))
+/* RSCFDnCFDRPGACCr */
+#define RCANFD_F_RPGACC(r)		(0x6400 + (0x04 * (r)))
+
+/* Constants */
+#define RCANFD_FIFO_DEPTH		8	/* Tx FIFO depth */
+#define RCANFD_NAPI_WEIGHT		8	/* Rx poll quota */
+
+#define RCANFD_NUM_CHANNELS		8	/* Eight channels max */
+#define RCANFD_CHANNELS_MASK		BIT((RCANFD_NUM_CHANNELS) - 1)
+
+#define RCANFD_GAFL_PAGENUM(entry)	((entry) / 16)
+#define RCANFD_CHANNEL_NUMRULES		1	/* only one rule per channel */
+
+/* Rx FIFO is a global resource of the controller. There are 8 such FIFOs
+ * available. Each channel gets a dedicated Rx FIFO (i.e.) the channel
+ * number is added to RFFIFO index.
+ */
+#define RCANFD_RFFIFO_IDX		0
+
+/* Tx/Rx or Common FIFO is a per channel resource. Each channel has 3 Common
+ * FIFOs dedicated to them. Use the first (index 0) FIFO out of the 3 for Tx.
+ */
+#define RCANFD_CFFIFO_IDX		0
+
+/* fCAN clock select register settings */
+enum rcar_canfd_fcanclk {
+	RCANFD_CANFDCLK = 0,		/* CANFD clock */
+	RCANFD_EXTCLK,			/* Externally input clock */
+};
+
+struct rcar_canfd_global;
+
+/* Channel priv data */
+struct rcar_canfd_channel {
+	struct can_priv can;			/* Must be the first member */
+	struct net_device *ndev;
+	struct rcar_canfd_global *gpriv;	/* Controller reference */
+	void __iomem *base;			/* Register base address */
+	struct napi_struct napi;
+	u32 tx_head;				/* Incremented on xmit */
+	u32 tx_tail;				/* Incremented on xmit done */
+	u32 channel;				/* Channel number */
+	spinlock_t tx_lock;			/* To protect tx path */
+};
+
+/* Global priv data */
+struct rcar_canfd_global {
+	struct rcar_canfd_channel *ch[RCANFD_NUM_CHANNELS];
+	void __iomem *base;		/* Register base address */
+	struct platform_device *pdev;	/* Respective platform device */
+	struct clk *clkp;		/* Peripheral clock */
+	struct clk *can_clk;		/* fCAN clock */
+	enum rcar_canfd_fcanclk fcan;	/* CANFD or Ext clock */
+	unsigned long channels_mask;	/* Enabled channels mask */
+	bool fdmode;			/* CAN FD or Classical CAN only mode */
+	struct reset_control *rstc1;
+	struct reset_control *rstc2;
+	enum rcanfd_chip_id chip_id;
+	u32 max_channels;
+};
+
+/* CAN FD mode nominal rate constants */
+static const struct can_bittiming_const rcar_canfd_nom_bittiming_const = {
+	.name = RCANFD_DRV_NAME,
+	.tseg1_min = 2,
+	.tseg1_max = 128,
+	.tseg2_min = 2,
+	.tseg2_max = 32,
+	.sjw_max = 32,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+/* CAN FD mode data rate constants */
+static const struct can_bittiming_const rcar_canfd_data_bittiming_const = {
+	.name = RCANFD_DRV_NAME,
+	.tseg1_min = 2,
+	.tseg1_max = 16,
+	.tseg2_min = 2,
+	.tseg2_max = 8,
+	.sjw_max = 8,
+	.brp_min = 1,
+	.brp_max = 256,
+	.brp_inc = 1,
+};
+
+/* Classical CAN mode bitrate constants */
+static const struct can_bittiming_const rcar_canfd_bittiming_const = {
+	.name = RCANFD_DRV_NAME,
+	.tseg1_min = 4,
+	.tseg1_max = 16,
+	.tseg2_min = 2,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+/* Helper functions */
+static inline bool is_v3u(struct rcar_canfd_global *gpriv)
+{
+	return gpriv->chip_id == RENESAS_R8A779A0;
+}
+
+static inline u32 reg_v3u(struct rcar_canfd_global *gpriv,
+			  u32 v3u, u32 not_v3u)
+{
+	return is_v3u(gpriv) ? v3u : not_v3u;
+}
+
+static inline void rcar_canfd_update(u32 mask, u32 val, u32 __iomem *reg)
+{
+	u32 data = readl(reg);
+
+	data &= ~mask;
+	data |= (val & mask);
+	writel(data, reg);
+}
+
+static inline u32 rcar_canfd_read(void __iomem *base, u32 offset)
+{
+	return readl(base + (offset));
+}
+
+static inline void rcar_canfd_write(void __iomem *base, u32 offset, u32 val)
+{
+	writel(val, base + (offset));
+}
+
+static void rcar_canfd_set_bit(void __iomem *base, u32 reg, u32 val)
+{
+	rcar_canfd_update(val, val, base + (reg));
+}
+
+static void rcar_canfd_clear_bit(void __iomem *base, u32 reg, u32 val)
+{
+	rcar_canfd_update(val, 0, base + (reg));
+}
+
+static void rcar_canfd_update_bit(void __iomem *base, u32 reg,
+				  u32 mask, u32 val)
+{
+	rcar_canfd_update(mask, val, base + (reg));
+}
+
+static void rcar_canfd_get_data(struct rcar_canfd_channel *priv,
+				struct canfd_frame *cf, u32 off)
+{
+	u32 i, lwords;
+
+	lwords = DIV_ROUND_UP(cf->len, sizeof(u32));
+	for (i = 0; i < lwords; i++)
+		*((u32 *)cf->data + i) =
+			rcar_canfd_read(priv->base, off + (i * sizeof(u32)));
+}
+
+static void rcar_canfd_put_data(struct rcar_canfd_channel *priv,
+				struct canfd_frame *cf, u32 off)
+{
+	u32 i, lwords;
+
+	lwords = DIV_ROUND_UP(cf->len, sizeof(u32));
+	for (i = 0; i < lwords; i++)
+		rcar_canfd_write(priv->base, off + (i * sizeof(u32)),
+				 *((u32 *)cf->data + i));
+}
+
+static void rcar_canfd_tx_failure_cleanup(struct net_device *ndev)
+{
+	u32 i;
+
+	for (i = 0; i < RCANFD_FIFO_DEPTH; i++)
+		can_free_echo_skb(ndev, i, NULL);
+}
+
+static void rcar_canfd_set_mode(struct rcar_canfd_global *gpriv)
+{
+	if (is_v3u(gpriv)) {
+		if (gpriv->fdmode)
+			rcar_canfd_set_bit(gpriv->base, RCANFD_V3U_CFDCFG,
+					   RCANFD_FDCFG_FDOE);
+		else
+			rcar_canfd_set_bit(gpriv->base, RCANFD_V3U_CFDCFG,
+					   RCANFD_FDCFG_CLOE);
+	} else {
+		if (gpriv->fdmode)
+			rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG,
+					   RCANFD_GRMCFG_RCMC);
+		else
+			rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG,
+					     RCANFD_GRMCFG_RCMC);
+	}
+}
+
+static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
+{
+	u32 sts, ch;
+	int err;
+
+	/* Check RAMINIT flag as CAN RAM initialization takes place
+	 * after the MCU reset
+	 */
+	err = readl_poll_timeout((gpriv->base + RCANFD_GSTS), sts,
+				 !(sts & RCANFD_GSTS_GRAMINIT), 2, 500000);
+	if (err) {
+		dev_dbg(&gpriv->pdev->dev, "global raminit failed\n");
+		return err;
+	}
+
+	/* Transition to Global Reset mode */
+	rcar_canfd_clear_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GSLPR);
+	rcar_canfd_update_bit(gpriv->base, RCANFD_GCTR,
+			      RCANFD_GCTR_GMDC_MASK, RCANFD_GCTR_GMDC_GRESET);
+
+	/* Ensure Global reset mode */
+	err = readl_poll_timeout((gpriv->base + RCANFD_GSTS), sts,
+				 (sts & RCANFD_GSTS_GRSTSTS), 2, 500000);
+	if (err) {
+		dev_dbg(&gpriv->pdev->dev, "global reset failed\n");
+		return err;
+	}
+
+	/* Reset Global error flags */
+	rcar_canfd_write(gpriv->base, RCANFD_GERFL, 0x0);
+
+	/* Set the controller into appropriate mode */
+	rcar_canfd_set_mode(gpriv);
+
+	/* Transition all Channels to reset mode */
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+		rcar_canfd_clear_bit(gpriv->base,
+				     RCANFD_CCTR(ch), RCANFD_CCTR_CSLPR);
+
+		rcar_canfd_update_bit(gpriv->base, RCANFD_CCTR(ch),
+				      RCANFD_CCTR_CHMDC_MASK,
+				      RCANFD_CCTR_CHDMC_CRESET);
+
+		/* Ensure Channel reset mode */
+		err = readl_poll_timeout((gpriv->base + RCANFD_CSTS(ch)), sts,
+					 (sts & RCANFD_CSTS_CRSTSTS),
+					 2, 500000);
+		if (err) {
+			dev_dbg(&gpriv->pdev->dev,
+				"channel %u reset failed\n", ch);
+			return err;
+		}
+	}
+	return 0;
+}
+
+static void rcar_canfd_configure_controller(struct rcar_canfd_global *gpriv)
+{
+	u32 cfg, ch;
+
+	/* Global configuration settings */
+
+	/* ECC Error flag Enable */
+	cfg = RCANFD_GCFG_EEFE;
+
+	if (gpriv->fdmode)
+		/* Truncate payload to configured message size RFPLS */
+		cfg |= RCANFD_GCFG_CMPOC;
+
+	/* Set External Clock if selected */
+	if (gpriv->fcan != RCANFD_CANFDCLK)
+		cfg |= RCANFD_GCFG_DCS;
+
+	rcar_canfd_set_bit(gpriv->base, RCANFD_GCFG, cfg);
+
+	/* Channel configuration settings */
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+		rcar_canfd_set_bit(gpriv->base, RCANFD_CCTR(ch),
+				   RCANFD_CCTR_ERRD);
+		rcar_canfd_update_bit(gpriv->base, RCANFD_CCTR(ch),
+				      RCANFD_CCTR_BOM_MASK,
+				      RCANFD_CCTR_BOM_BENTRY);
+	}
+}
+
+static void rcar_canfd_configure_afl_rules(struct rcar_canfd_global *gpriv,
+					   u32 ch)
+{
+	u32 cfg;
+	int offset, start, page, num_rules = RCANFD_CHANNEL_NUMRULES;
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	if (ch == 0) {
+		start = 0; /* Channel 0 always starts from 0th rule */
+	} else {
+		/* Get number of Channel 0 rules and adjust */
+		cfg = rcar_canfd_read(gpriv->base, RCANFD_GAFLCFG(ch));
+		start = RCANFD_GAFLCFG_GETRNC(gpriv, 0, cfg);
+	}
+
+	/* Enable write access to entry */
+	page = RCANFD_GAFL_PAGENUM(start);
+	rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLECTR,
+			   (RCANFD_GAFLECTR_AFLPN(gpriv, page) |
+			    RCANFD_GAFLECTR_AFLDAE));
+
+	/* Write number of rules for channel */
+	rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLCFG(ch),
+			   RCANFD_GAFLCFG_SETRNC(gpriv, ch, num_rules));
+	if (is_v3u(gpriv))
+		offset = RCANFD_V3U_GAFL_OFFSET;
+	else if (gpriv->fdmode)
+		offset = RCANFD_F_GAFL_OFFSET;
+	else
+		offset = RCANFD_C_GAFL_OFFSET;
+
+	/* Accept all IDs */
+	rcar_canfd_write(gpriv->base, RCANFD_GAFLID(offset, start), 0);
+	/* IDE or RTR is not considered for matching */
+	rcar_canfd_write(gpriv->base, RCANFD_GAFLM(offset, start), 0);
+	/* Any data length accepted */
+	rcar_canfd_write(gpriv->base, RCANFD_GAFLP0(offset, start), 0);
+	/* Place the msg in corresponding Rx FIFO entry */
+	rcar_canfd_set_bit(gpriv->base, RCANFD_GAFLP1(offset, start),
+			   RCANFD_GAFLP1_GAFLFDP(ridx));
+
+	/* Disable write access to page */
+	rcar_canfd_clear_bit(gpriv->base,
+			     RCANFD_GAFLECTR, RCANFD_GAFLECTR_AFLDAE);
+}
+
+static void rcar_canfd_configure_rx(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	/* Rx FIFO is used for reception */
+	u32 cfg;
+	u16 rfdc, rfpls;
+
+	/* Select Rx FIFO based on channel */
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	rfdc = 2;		/* b010 - 8 messages Rx FIFO depth */
+	if (gpriv->fdmode)
+		rfpls = 7;	/* b111 - Max 64 bytes payload */
+	else
+		rfpls = 0;	/* b000 - Max 8 bytes payload */
+
+	cfg = (RCANFD_RFCC_RFIM | RCANFD_RFCC_RFDC(rfdc) |
+		RCANFD_RFCC_RFPLS(rfpls) | RCANFD_RFCC_RFIE);
+	rcar_canfd_write(gpriv->base, RCANFD_RFCC(gpriv, ridx), cfg);
+}
+
+static void rcar_canfd_configure_tx(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	/* Tx/Rx(Common) FIFO configured in Tx mode is
+	 * used for transmission
+	 *
+	 * Each channel has 3 Common FIFO dedicated to them.
+	 * Use the 1st (index 0) out of 3
+	 */
+	u32 cfg;
+	u16 cftml, cfm, cfdc, cfpls;
+
+	cftml = 0;		/* 0th buffer */
+	cfm = 1;		/* b01 - Transmit mode */
+	cfdc = 2;		/* b010 - 8 messages Tx FIFO depth */
+	if (gpriv->fdmode)
+		cfpls = 7;	/* b111 - Max 64 bytes payload */
+	else
+		cfpls = 0;	/* b000 - Max 8 bytes payload */
+
+	cfg = (RCANFD_CFCC_CFTML(gpriv, cftml) | RCANFD_CFCC_CFM(gpriv, cfm) |
+		RCANFD_CFCC_CFIM | RCANFD_CFCC_CFDC(gpriv, cfdc) |
+		RCANFD_CFCC_CFPLS(cfpls) | RCANFD_CFCC_CFTXIE);
+	rcar_canfd_write(gpriv->base, RCANFD_CFCC(gpriv, ch, RCANFD_CFFIFO_IDX), cfg);
+
+	if (gpriv->fdmode)
+		/* Clear FD mode specific control/status register */
+		rcar_canfd_write(gpriv->base,
+				 RCANFD_F_CFFDCSTS(gpriv, ch, RCANFD_CFFIFO_IDX), 0);
+}
+
+static void rcar_canfd_enable_global_interrupts(struct rcar_canfd_global *gpriv)
+{
+	u32 ctr;
+
+	/* Clear any stray error interrupt flags */
+	rcar_canfd_write(gpriv->base, RCANFD_GERFL, 0);
+
+	/* Global interrupts setup */
+	ctr = RCANFD_GCTR_MEIE;
+	if (gpriv->fdmode)
+		ctr |= RCANFD_GCTR_CFMPOFIE;
+
+	rcar_canfd_set_bit(gpriv->base, RCANFD_GCTR, ctr);
+}
+
+static void rcar_canfd_disable_global_interrupts(struct rcar_canfd_global
+						 *gpriv)
+{
+	/* Disable all interrupts */
+	rcar_canfd_write(gpriv->base, RCANFD_GCTR, 0);
+
+	/* Clear any stray error interrupt flags */
+	rcar_canfd_write(gpriv->base, RCANFD_GERFL, 0);
+}
+
+static void rcar_canfd_enable_channel_interrupts(struct rcar_canfd_channel
+						 *priv)
+{
+	u32 ctr, ch = priv->channel;
+
+	/* Clear any stray error flags */
+	rcar_canfd_write(priv->base, RCANFD_CERFL(ch), 0);
+
+	/* Channel interrupts setup */
+	ctr = (RCANFD_CCTR_TAIE |
+	       RCANFD_CCTR_ALIE | RCANFD_CCTR_BLIE |
+	       RCANFD_CCTR_OLIE | RCANFD_CCTR_BORIE |
+	       RCANFD_CCTR_BOEIE | RCANFD_CCTR_EPIE |
+	       RCANFD_CCTR_EWIE | RCANFD_CCTR_BEIE);
+	rcar_canfd_set_bit(priv->base, RCANFD_CCTR(ch), ctr);
+}
+
+static void rcar_canfd_disable_channel_interrupts(struct rcar_canfd_channel
+						  *priv)
+{
+	u32 ctr, ch = priv->channel;
+
+	ctr = (RCANFD_CCTR_TAIE |
+	       RCANFD_CCTR_ALIE | RCANFD_CCTR_BLIE |
+	       RCANFD_CCTR_OLIE | RCANFD_CCTR_BORIE |
+	       RCANFD_CCTR_BOEIE | RCANFD_CCTR_EPIE |
+	       RCANFD_CCTR_EWIE | RCANFD_CCTR_BEIE);
+	rcar_canfd_clear_bit(priv->base, RCANFD_CCTR(ch), ctr);
+
+	/* Clear any stray error flags */
+	rcar_canfd_write(priv->base, RCANFD_CERFL(ch), 0);
+}
+
+static void rcar_canfd_global_error(struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	struct net_device_stats *stats = &ndev->stats;
+	u32 ch = priv->channel;
+	u32 gerfl, sts;
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	gerfl = rcar_canfd_read(priv->base, RCANFD_GERFL);
+	if (gerfl & RCANFD_GERFL_EEF(ch)) {
+		netdev_dbg(ndev, "Ch%u: ECC Error flag\n", ch);
+		stats->tx_dropped++;
+	}
+	if (gerfl & RCANFD_GERFL_MES) {
+		sts = rcar_canfd_read(priv->base,
+				      RCANFD_CFSTS(gpriv, ch, RCANFD_CFFIFO_IDX));
+		if (sts & RCANFD_CFSTS_CFMLT) {
+			netdev_dbg(ndev, "Tx Message Lost flag\n");
+			stats->tx_dropped++;
+			rcar_canfd_write(priv->base,
+					 RCANFD_CFSTS(gpriv, ch, RCANFD_CFFIFO_IDX),
+					 sts & ~RCANFD_CFSTS_CFMLT);
+		}
+
+		sts = rcar_canfd_read(priv->base, RCANFD_RFSTS(gpriv, ridx));
+		if (sts & RCANFD_RFSTS_RFMLT) {
+			netdev_dbg(ndev, "Rx Message Lost flag\n");
+			stats->rx_dropped++;
+			rcar_canfd_write(priv->base, RCANFD_RFSTS(gpriv, ridx),
+					 sts & ~RCANFD_RFSTS_RFMLT);
+		}
+	}
+	if (gpriv->fdmode && gerfl & RCANFD_GERFL_CMPOF) {
+		/* Message Lost flag will be set for respective channel
+		 * when this condition happens with counters and flags
+		 * already updated.
+		 */
+		netdev_dbg(ndev, "global payload overflow interrupt\n");
+	}
+
+	/* Clear all global error interrupts. Only affected channels bits
+	 * get cleared
+	 */
+	rcar_canfd_write(priv->base, RCANFD_GERFL, 0);
+}
+
+static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
+			     u16 txerr, u16 rxerr)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	u32 ch = priv->channel;
+
+	netdev_dbg(ndev, "ch erfl %x txerr %u rxerr %u\n", cerfl, txerr, rxerr);
+
+	/* Propagate the error condition to the CAN stack */
+	skb = alloc_can_err_skb(ndev, &cf);
+	if (!skb) {
+		stats->rx_dropped++;
+		return;
+	}
+
+	/* Channel error interrupts */
+	if (cerfl & RCANFD_CERFL_BEF) {
+		netdev_dbg(ndev, "Bus error\n");
+		cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
+		cf->data[2] = CAN_ERR_PROT_UNSPEC;
+		priv->can.can_stats.bus_error++;
+	}
+	if (cerfl & RCANFD_CERFL_ADERR) {
+		netdev_dbg(ndev, "ACK Delimiter Error\n");
+		stats->tx_errors++;
+		cf->data[3] |= CAN_ERR_PROT_LOC_ACK_DEL;
+	}
+	if (cerfl & RCANFD_CERFL_B0ERR) {
+		netdev_dbg(ndev, "Bit Error (dominant)\n");
+		stats->tx_errors++;
+		cf->data[2] |= CAN_ERR_PROT_BIT0;
+	}
+	if (cerfl & RCANFD_CERFL_B1ERR) {
+		netdev_dbg(ndev, "Bit Error (recessive)\n");
+		stats->tx_errors++;
+		cf->data[2] |= CAN_ERR_PROT_BIT1;
+	}
+	if (cerfl & RCANFD_CERFL_CERR) {
+		netdev_dbg(ndev, "CRC Error\n");
+		stats->rx_errors++;
+		cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
+	}
+	if (cerfl & RCANFD_CERFL_AERR) {
+		netdev_dbg(ndev, "ACK Error\n");
+		stats->tx_errors++;
+		cf->can_id |= CAN_ERR_ACK;
+		cf->data[3] |= CAN_ERR_PROT_LOC_ACK;
+	}
+	if (cerfl & RCANFD_CERFL_FERR) {
+		netdev_dbg(ndev, "Form Error\n");
+		stats->rx_errors++;
+		cf->data[2] |= CAN_ERR_PROT_FORM;
+	}
+	if (cerfl & RCANFD_CERFL_SERR) {
+		netdev_dbg(ndev, "Stuff Error\n");
+		stats->rx_errors++;
+		cf->data[2] |= CAN_ERR_PROT_STUFF;
+	}
+	if (cerfl & RCANFD_CERFL_ALF) {
+		netdev_dbg(ndev, "Arbitration lost Error\n");
+		priv->can.can_stats.arbitration_lost++;
+		cf->can_id |= CAN_ERR_LOSTARB;
+		cf->data[0] |= CAN_ERR_LOSTARB_UNSPEC;
+	}
+	if (cerfl & RCANFD_CERFL_BLF) {
+		netdev_dbg(ndev, "Bus Lock Error\n");
+		stats->rx_errors++;
+		cf->can_id |= CAN_ERR_BUSERROR;
+	}
+	if (cerfl & RCANFD_CERFL_EWF) {
+		netdev_dbg(ndev, "Error warning interrupt\n");
+		priv->can.state = CAN_STATE_ERROR_WARNING;
+		priv->can.can_stats.error_warning++;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
+		cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_WARNING :
+			CAN_ERR_CRTL_RX_WARNING;
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
+	if (cerfl & RCANFD_CERFL_EPF) {
+		netdev_dbg(ndev, "Error passive interrupt\n");
+		priv->can.state = CAN_STATE_ERROR_PASSIVE;
+		priv->can.can_stats.error_passive++;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
+		cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_PASSIVE :
+			CAN_ERR_CRTL_RX_PASSIVE;
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
+	if (cerfl & RCANFD_CERFL_BOEF) {
+		netdev_dbg(ndev, "Bus-off entry interrupt\n");
+		rcar_canfd_tx_failure_cleanup(ndev);
+		priv->can.state = CAN_STATE_BUS_OFF;
+		priv->can.can_stats.bus_off++;
+		can_bus_off(ndev);
+		cf->can_id |= CAN_ERR_BUSOFF;
+	}
+	if (cerfl & RCANFD_CERFL_OVLF) {
+		netdev_dbg(ndev,
+			   "Overload Frame Transmission error interrupt\n");
+		stats->tx_errors++;
+		cf->can_id |= CAN_ERR_PROT;
+		cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
+	}
+
+	/* Clear channel error interrupts that are handled */
+	rcar_canfd_write(priv->base, RCANFD_CERFL(ch),
+			 RCANFD_CERFL_ERR(~cerfl));
+	netif_rx(skb);
+}
+
+static void rcar_canfd_tx_done(struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	struct net_device_stats *stats = &ndev->stats;
+	u32 sts;
+	unsigned long flags;
+	u32 ch = priv->channel;
+
+	do {
+		u8 unsent, sent;
+
+		sent = priv->tx_tail % RCANFD_FIFO_DEPTH;
+		stats->tx_packets++;
+		stats->tx_bytes += can_get_echo_skb(ndev, sent, NULL);
+
+		spin_lock_irqsave(&priv->tx_lock, flags);
+		priv->tx_tail++;
+		sts = rcar_canfd_read(priv->base,
+				      RCANFD_CFSTS(gpriv, ch, RCANFD_CFFIFO_IDX));
+		unsent = RCANFD_CFSTS_CFMC(sts);
+
+		/* Wake producer only when there is room */
+		if (unsent != RCANFD_FIFO_DEPTH)
+			netif_wake_queue(ndev);
+
+		if (priv->tx_head - priv->tx_tail <= unsent) {
+			spin_unlock_irqrestore(&priv->tx_lock, flags);
+			break;
+		}
+		spin_unlock_irqrestore(&priv->tx_lock, flags);
+
+	} while (1);
+
+	/* Clear interrupt */
+	rcar_canfd_write(priv->base, RCANFD_CFSTS(gpriv, ch, RCANFD_CFFIFO_IDX),
+			 sts & ~RCANFD_CFSTS_CFTXIF);
+}
+
+static void rcar_canfd_handle_global_err(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	struct rcar_canfd_channel *priv = gpriv->ch[ch];
+	struct net_device *ndev = priv->ndev;
+	u32 gerfl;
+
+	/* Handle global error interrupts */
+	gerfl = rcar_canfd_read(priv->base, RCANFD_GERFL);
+	if (unlikely(RCANFD_GERFL_ERR(gpriv, gerfl)))
+		rcar_canfd_global_error(ndev);
+}
+
+static irqreturn_t rcar_canfd_global_err_interrupt(int irq, void *dev_id)
+{
+	struct rcar_canfd_global *gpriv = dev_id;
+	u32 ch;
+
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
+		rcar_canfd_handle_global_err(gpriv, ch);
+
+	return IRQ_HANDLED;
+}
+
+static void rcar_canfd_handle_global_receive(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	struct rcar_canfd_channel *priv = gpriv->ch[ch];
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+	u32 sts, cc;
+
+	/* Handle Rx interrupts */
+	sts = rcar_canfd_read(priv->base, RCANFD_RFSTS(gpriv, ridx));
+	cc = rcar_canfd_read(priv->base, RCANFD_RFCC(gpriv, ridx));
+	if (likely(sts & RCANFD_RFSTS_RFIF &&
+		   cc & RCANFD_RFCC_RFIE)) {
+		if (napi_schedule_prep(&priv->napi)) {
+			/* Disable Rx FIFO interrupts */
+			rcar_canfd_clear_bit(priv->base,
+					     RCANFD_RFCC(gpriv, ridx),
+					     RCANFD_RFCC_RFIE);
+			__napi_schedule(&priv->napi);
+		}
+	}
+}
+
+static irqreturn_t rcar_canfd_global_receive_fifo_interrupt(int irq, void *dev_id)
+{
+	struct rcar_canfd_global *gpriv = dev_id;
+	u32 ch;
+
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
+		rcar_canfd_handle_global_receive(gpriv, ch);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t rcar_canfd_global_interrupt(int irq, void *dev_id)
+{
+	struct rcar_canfd_global *gpriv = dev_id;
+	u32 ch;
+
+	/* Global error interrupts still indicate a condition specific
+	 * to a channel. RxFIFO interrupt is a global interrupt.
+	 */
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+		rcar_canfd_handle_global_err(gpriv, ch);
+		rcar_canfd_handle_global_receive(gpriv, ch);
+	}
+	return IRQ_HANDLED;
+}
+
+static void rcar_canfd_state_change(struct net_device *ndev,
+				    u16 txerr, u16 rxerr)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	enum can_state rx_state, tx_state, state = priv->can.state;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+
+	/* Handle transition from error to normal states */
+	if (txerr < 96 && rxerr < 96)
+		state = CAN_STATE_ERROR_ACTIVE;
+	else if (txerr < 128 && rxerr < 128)
+		state = CAN_STATE_ERROR_WARNING;
+
+	if (state != priv->can.state) {
+		netdev_dbg(ndev, "state: new %d, old %d: txerr %u, rxerr %u\n",
+			   state, priv->can.state, txerr, rxerr);
+		skb = alloc_can_err_skb(ndev, &cf);
+		if (!skb) {
+			stats->rx_dropped++;
+			return;
+		}
+		tx_state = txerr >= rxerr ? state : 0;
+		rx_state = txerr <= rxerr ? state : 0;
+
+		can_change_state(ndev, cf, tx_state, rx_state);
+		netif_rx(skb);
+	}
+}
+
+static void rcar_canfd_handle_channel_tx(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	struct rcar_canfd_channel *priv = gpriv->ch[ch];
+	struct net_device *ndev = priv->ndev;
+	u32 sts;
+
+	/* Handle Tx interrupts */
+	sts = rcar_canfd_read(priv->base,
+			      RCANFD_CFSTS(gpriv, ch, RCANFD_CFFIFO_IDX));
+	if (likely(sts & RCANFD_CFSTS_CFTXIF))
+		rcar_canfd_tx_done(ndev);
+}
+
+static irqreturn_t rcar_canfd_channel_tx_interrupt(int irq, void *dev_id)
+{
+	struct rcar_canfd_channel *priv = dev_id;
+
+	rcar_canfd_handle_channel_tx(priv->gpriv, priv->channel);
+
+	return IRQ_HANDLED;
+}
+
+static void rcar_canfd_handle_channel_err(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	struct rcar_canfd_channel *priv = gpriv->ch[ch];
+	struct net_device *ndev = priv->ndev;
+	u16 txerr, rxerr;
+	u32 sts, cerfl;
+
+	/* Handle channel error interrupts */
+	cerfl = rcar_canfd_read(priv->base, RCANFD_CERFL(ch));
+	sts = rcar_canfd_read(priv->base, RCANFD_CSTS(ch));
+	txerr = RCANFD_CSTS_TECCNT(sts);
+	rxerr = RCANFD_CSTS_RECCNT(sts);
+	if (unlikely(RCANFD_CERFL_ERR(cerfl)))
+		rcar_canfd_error(ndev, cerfl, txerr, rxerr);
+
+	/* Handle state change to lower states */
+	if (unlikely(priv->can.state != CAN_STATE_ERROR_ACTIVE &&
+		     priv->can.state != CAN_STATE_BUS_OFF))
+		rcar_canfd_state_change(ndev, txerr, rxerr);
+}
+
+static irqreturn_t rcar_canfd_channel_err_interrupt(int irq, void *dev_id)
+{
+	struct rcar_canfd_channel *priv = dev_id;
+
+	rcar_canfd_handle_channel_err(priv->gpriv, priv->channel);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t rcar_canfd_channel_interrupt(int irq, void *dev_id)
+{
+	struct rcar_canfd_global *gpriv = dev_id;
+	u32 ch;
+
+	/* Common FIFO is a per channel resource */
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+		rcar_canfd_handle_channel_err(gpriv, ch);
+		rcar_canfd_handle_channel_tx(gpriv, ch);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void rcar_canfd_set_bittiming(struct net_device *dev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(dev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	const struct can_bittiming *bt = &priv->can.bittiming;
+	const struct can_bittiming *dbt = &priv->can.data_bittiming;
+	u16 brp, sjw, tseg1, tseg2;
+	u32 cfg;
+	u32 ch = priv->channel;
+
+	/* Nominal bit timing settings */
+	brp = bt->brp - 1;
+	sjw = bt->sjw - 1;
+	tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
+	tseg2 = bt->phase_seg2 - 1;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
+		/* CAN FD only mode */
+		cfg = (RCANFD_NCFG_NTSEG1(gpriv, tseg1) | RCANFD_NCFG_NBRP(brp) |
+		       RCANFD_NCFG_NSJW(gpriv, sjw) | RCANFD_NCFG_NTSEG2(gpriv, tseg2));
+
+		rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
+		netdev_dbg(priv->ndev, "nrate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
+			   brp, sjw, tseg1, tseg2);
+
+		/* Data bit timing settings */
+		brp = dbt->brp - 1;
+		sjw = dbt->sjw - 1;
+		tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
+		tseg2 = dbt->phase_seg2 - 1;
+
+		cfg = (RCANFD_DCFG_DTSEG1(gpriv, tseg1) | RCANFD_DCFG_DBRP(brp) |
+		       RCANFD_DCFG_DSJW(sjw) | RCANFD_DCFG_DTSEG2(gpriv, tseg2));
+
+		if (is_v3u(gpriv))
+			rcar_canfd_write(priv->base, RCANFD_V3U_DCFG(ch), cfg);
+		else
+			rcar_canfd_write(priv->base, RCANFD_F_DCFG(ch), cfg);
+		netdev_dbg(priv->ndev, "drate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
+			   brp, sjw, tseg1, tseg2);
+	} else {
+		/* Classical CAN only mode */
+		if (is_v3u(gpriv)) {
+			cfg = (RCANFD_NCFG_NTSEG1(gpriv, tseg1) |
+			       RCANFD_NCFG_NBRP(brp) |
+			       RCANFD_NCFG_NSJW(gpriv, sjw) |
+			       RCANFD_NCFG_NTSEG2(gpriv, tseg2));
+		} else {
+			cfg = (RCANFD_CFG_TSEG1(tseg1) |
+			       RCANFD_CFG_BRP(brp) |
+			       RCANFD_CFG_SJW(sjw) |
+			       RCANFD_CFG_TSEG2(tseg2));
+		}
+
+		rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
+		netdev_dbg(priv->ndev,
+			   "rate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
+			   brp, sjw, tseg1, tseg2);
+	}
+}
+
+static int rcar_canfd_start(struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	int err = -EOPNOTSUPP;
+	u32 sts, ch = priv->channel;
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	rcar_canfd_set_bittiming(ndev);
+
+	rcar_canfd_enable_channel_interrupts(priv);
+
+	/* Set channel to Operational mode */
+	rcar_canfd_update_bit(priv->base, RCANFD_CCTR(ch),
+			      RCANFD_CCTR_CHMDC_MASK, RCANFD_CCTR_CHDMC_COPM);
+
+	/* Verify channel mode change */
+	err = readl_poll_timeout((priv->base + RCANFD_CSTS(ch)), sts,
+				 (sts & RCANFD_CSTS_COMSTS), 2, 500000);
+	if (err) {
+		netdev_err(ndev, "channel %u communication state failed\n", ch);
+		goto fail_mode_change;
+	}
+
+	/* Enable Common & Rx FIFO */
+	rcar_canfd_set_bit(priv->base, RCANFD_CFCC(gpriv, ch, RCANFD_CFFIFO_IDX),
+			   RCANFD_CFCC_CFE);
+	rcar_canfd_set_bit(priv->base, RCANFD_RFCC(gpriv, ridx), RCANFD_RFCC_RFE);
+
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+	return 0;
+
+fail_mode_change:
+	rcar_canfd_disable_channel_interrupts(priv);
+	return err;
+}
+
+static int rcar_canfd_open(struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	int err;
+
+	/* Peripheral clock is already enabled in probe */
+	err = clk_prepare_enable(gpriv->can_clk);
+	if (err) {
+		netdev_err(ndev, "failed to enable CAN clock, error %d\n", err);
+		goto out_clock;
+	}
+
+	err = open_candev(ndev);
+	if (err) {
+		netdev_err(ndev, "open_candev() failed, error %d\n", err);
+		goto out_can_clock;
+	}
+
+	napi_enable(&priv->napi);
+	err = rcar_canfd_start(ndev);
+	if (err)
+		goto out_close;
+	netif_start_queue(ndev);
+	return 0;
+out_close:
+	napi_disable(&priv->napi);
+	close_candev(ndev);
+out_can_clock:
+	clk_disable_unprepare(gpriv->can_clk);
+out_clock:
+	return err;
+}
+
+static void rcar_canfd_stop(struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	int err;
+	u32 sts, ch = priv->channel;
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	/* Transition to channel reset mode  */
+	rcar_canfd_update_bit(priv->base, RCANFD_CCTR(ch),
+			      RCANFD_CCTR_CHMDC_MASK, RCANFD_CCTR_CHDMC_CRESET);
+
+	/* Check Channel reset mode */
+	err = readl_poll_timeout((priv->base + RCANFD_CSTS(ch)), sts,
+				 (sts & RCANFD_CSTS_CRSTSTS), 2, 500000);
+	if (err)
+		netdev_err(ndev, "channel %u reset failed\n", ch);
+
+	rcar_canfd_disable_channel_interrupts(priv);
+
+	/* Disable Common & Rx FIFO */
+	rcar_canfd_clear_bit(priv->base, RCANFD_CFCC(gpriv, ch, RCANFD_CFFIFO_IDX),
+			     RCANFD_CFCC_CFE);
+	rcar_canfd_clear_bit(priv->base, RCANFD_RFCC(gpriv, ridx), RCANFD_RFCC_RFE);
+
+	/* Set the state as STOPPED */
+	priv->can.state = CAN_STATE_STOPPED;
+}
+
+static int rcar_canfd_close(struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+
+	netif_stop_queue(ndev);
+	rcar_canfd_stop(ndev);
+	napi_disable(&priv->napi);
+	clk_disable_unprepare(gpriv->can_clk);
+	close_candev(ndev);
+	return 0;
+}
+
+static netdev_tx_t rcar_canfd_start_xmit(struct sk_buff *skb,
+					 struct net_device *ndev)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(ndev);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	struct canfd_frame *cf = (struct canfd_frame *)skb->data;
+	u32 sts = 0, id, dlc;
+	unsigned long flags;
+	u32 ch = priv->channel;
+
+	if (can_dev_dropped_skb(ndev, skb))
+		return NETDEV_TX_OK;
+
+	if (cf->can_id & CAN_EFF_FLAG) {
+		id = cf->can_id & CAN_EFF_MASK;
+		id |= RCANFD_CFID_CFIDE;
+	} else {
+		id = cf->can_id & CAN_SFF_MASK;
+	}
+
+	if (cf->can_id & CAN_RTR_FLAG)
+		id |= RCANFD_CFID_CFRTR;
+
+	dlc = RCANFD_CFPTR_CFDLC(can_fd_len2dlc(cf->len));
+
+	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || is_v3u(gpriv)) {
+		rcar_canfd_write(priv->base,
+				 RCANFD_F_CFID(gpriv, ch, RCANFD_CFFIFO_IDX), id);
+		rcar_canfd_write(priv->base,
+				 RCANFD_F_CFPTR(gpriv, ch, RCANFD_CFFIFO_IDX), dlc);
+
+		if (can_is_canfd_skb(skb)) {
+			/* CAN FD frame format */
+			sts |= RCANFD_CFFDCSTS_CFFDF;
+			if (cf->flags & CANFD_BRS)
+				sts |= RCANFD_CFFDCSTS_CFBRS;
+
+			if (priv->can.state == CAN_STATE_ERROR_PASSIVE)
+				sts |= RCANFD_CFFDCSTS_CFESI;
+		}
+
+		rcar_canfd_write(priv->base,
+				 RCANFD_F_CFFDCSTS(gpriv, ch, RCANFD_CFFIFO_IDX), sts);
+
+		rcar_canfd_put_data(priv, cf,
+				    RCANFD_F_CFDF(gpriv, ch, RCANFD_CFFIFO_IDX, 0));
+	} else {
+		rcar_canfd_write(priv->base,
+				 RCANFD_C_CFID(ch, RCANFD_CFFIFO_IDX), id);
+		rcar_canfd_write(priv->base,
+				 RCANFD_C_CFPTR(ch, RCANFD_CFFIFO_IDX), dlc);
+		rcar_canfd_put_data(priv, cf,
+				    RCANFD_C_CFDF(ch, RCANFD_CFFIFO_IDX, 0));
+	}
+
+	can_put_echo_skb(skb, ndev, priv->tx_head % RCANFD_FIFO_DEPTH, 0);
+
+	spin_lock_irqsave(&priv->tx_lock, flags);
+	priv->tx_head++;
+
+	/* Stop the queue if we've filled all FIFO entries */
+	if (priv->tx_head - priv->tx_tail >= RCANFD_FIFO_DEPTH)
+		netif_stop_queue(ndev);
+
+	/* Start Tx: Write 0xff to CFPC to increment the CPU-side
+	 * pointer for the Common FIFO
+	 */
+	rcar_canfd_write(priv->base,
+			 RCANFD_CFPCTR(gpriv, ch, RCANFD_CFFIFO_IDX), 0xff);
+
+	spin_unlock_irqrestore(&priv->tx_lock, flags);
+	return NETDEV_TX_OK;
+}
+
+static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
+{
+	struct net_device_stats *stats = &priv->ndev->stats;
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	struct canfd_frame *cf;
+	struct sk_buff *skb;
+	u32 sts = 0, id, dlc;
+	u32 ch = priv->channel;
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || is_v3u(gpriv)) {
+		id = rcar_canfd_read(priv->base, RCANFD_F_RFID(gpriv, ridx));
+		dlc = rcar_canfd_read(priv->base, RCANFD_F_RFPTR(gpriv, ridx));
+
+		sts = rcar_canfd_read(priv->base, RCANFD_F_RFFDSTS(gpriv, ridx));
+
+		if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
+		    sts & RCANFD_RFFDSTS_RFFDF)
+			skb = alloc_canfd_skb(priv->ndev, &cf);
+		else
+			skb = alloc_can_skb(priv->ndev,
+					    (struct can_frame **)&cf);
+	} else {
+		id = rcar_canfd_read(priv->base, RCANFD_C_RFID(ridx));
+		dlc = rcar_canfd_read(priv->base, RCANFD_C_RFPTR(ridx));
+		skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf);
+	}
+
+	if (!skb) {
+		stats->rx_dropped++;
+		return;
+	}
+
+	if (id & RCANFD_RFID_RFIDE)
+		cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
+	else
+		cf->can_id = id & CAN_SFF_MASK;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
+		if (sts & RCANFD_RFFDSTS_RFFDF)
+			cf->len = can_fd_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
+		else
+			cf->len = can_cc_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
+
+		if (sts & RCANFD_RFFDSTS_RFESI) {
+			cf->flags |= CANFD_ESI;
+			netdev_dbg(priv->ndev, "ESI Error\n");
+		}
+
+		if (!(sts & RCANFD_RFFDSTS_RFFDF) && (id & RCANFD_RFID_RFRTR)) {
+			cf->can_id |= CAN_RTR_FLAG;
+		} else {
+			if (sts & RCANFD_RFFDSTS_RFBRS)
+				cf->flags |= CANFD_BRS;
+
+			rcar_canfd_get_data(priv, cf, RCANFD_F_RFDF(gpriv, ridx, 0));
+		}
+	} else {
+		cf->len = can_cc_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
+		if (id & RCANFD_RFID_RFRTR)
+			cf->can_id |= CAN_RTR_FLAG;
+		else if (is_v3u(gpriv))
+			rcar_canfd_get_data(priv, cf, RCANFD_F_RFDF(gpriv, ridx, 0));
+		else
+			rcar_canfd_get_data(priv, cf, RCANFD_C_RFDF(ridx, 0));
+	}
+
+	/* Write 0xff to RFPC to increment the CPU-side
+	 * pointer of the Rx FIFO
+	 */
+	rcar_canfd_write(priv->base, RCANFD_RFPCTR(gpriv, ridx), 0xff);
+
+	if (!(cf->can_id & CAN_RTR_FLAG))
+		stats->rx_bytes += cf->len;
+	stats->rx_packets++;
+	netif_receive_skb(skb);
+}
+
+static int rcar_canfd_rx_poll(struct napi_struct *napi, int quota)
+{
+	struct rcar_canfd_channel *priv =
+		container_of(napi, struct rcar_canfd_channel, napi);
+	struct rcar_canfd_global *gpriv = priv->gpriv;
+	int num_pkts;
+	u32 sts;
+	u32 ch = priv->channel;
+	u32 ridx = ch + RCANFD_RFFIFO_IDX;
+
+	for (num_pkts = 0; num_pkts < quota; num_pkts++) {
+		sts = rcar_canfd_read(priv->base, RCANFD_RFSTS(gpriv, ridx));
+		/* Check FIFO empty condition */
+		if (sts & RCANFD_RFSTS_RFEMP)
+			break;
+
+		rcar_canfd_rx_pkt(priv);
+
+		/* Clear interrupt bit */
+		if (sts & RCANFD_RFSTS_RFIF)
+			rcar_canfd_write(priv->base, RCANFD_RFSTS(gpriv, ridx),
+					 sts & ~RCANFD_RFSTS_RFIF);
+	}
+
+	/* All packets processed */
+	if (num_pkts < quota) {
+		if (napi_complete_done(napi, num_pkts)) {
+			/* Enable Rx FIFO interrupts */
+			rcar_canfd_set_bit(priv->base, RCANFD_RFCC(gpriv, ridx),
+					   RCANFD_RFCC_RFIE);
+		}
+	}
+	return num_pkts;
+}
+
+static int rcar_canfd_do_set_mode(struct net_device *ndev, enum can_mode mode)
+{
+	int err;
+
+	switch (mode) {
+	case CAN_MODE_START:
+		err = rcar_canfd_start(ndev);
+		if (err)
+			return err;
+		netif_wake_queue(ndev);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int rcar_canfd_get_berr_counter(const struct net_device *dev,
+				       struct can_berr_counter *bec)
+{
+	struct rcar_canfd_channel *priv = netdev_priv(dev);
+	u32 val, ch = priv->channel;
+
+	/* Peripheral clock is already enabled in probe */
+	val = rcar_canfd_read(priv->base, RCANFD_CSTS(ch));
+	bec->txerr = RCANFD_CSTS_TECCNT(val);
+	bec->rxerr = RCANFD_CSTS_RECCNT(val);
+	return 0;
+}
+
+static const struct net_device_ops rcar_canfd_netdev_ops = {
+	.ndo_open = rcar_canfd_open,
+	.ndo_stop = rcar_canfd_close,
+	.ndo_start_xmit = rcar_canfd_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct ethtool_ops rcar_canfd_ethtool_ops = {
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
+static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
+				    u32 fcan_freq)
+{
+	struct platform_device *pdev = gpriv->pdev;
+	struct rcar_canfd_channel *priv;
+	struct net_device *ndev;
+	int err = -ENODEV;
+
+	ndev = alloc_candev(sizeof(*priv), RCANFD_FIFO_DEPTH);
+	if (!ndev) {
+		dev_err(&pdev->dev, "alloc_candev() failed\n");
+		return -ENOMEM;
+	}
+	priv = netdev_priv(ndev);
+
+	ndev->netdev_ops = &rcar_canfd_netdev_ops;
+	ndev->ethtool_ops = &rcar_canfd_ethtool_ops;
+	ndev->flags |= IFF_ECHO;
+	priv->ndev = ndev;
+	priv->base = gpriv->base;
+	priv->channel = ch;
+	priv->gpriv = gpriv;
+	priv->can.clock.freq = fcan_freq;
+	dev_info(&pdev->dev, "can_clk rate is %u\n", priv->can.clock.freq);
+
+	if (gpriv->chip_id == RENESAS_RZG2L) {
+		char *irq_name;
+		int err_irq;
+		int tx_irq;
+
+		err_irq = platform_get_irq_byname(pdev, ch == 0 ? "ch0_err" : "ch1_err");
+		if (err_irq < 0) {
+			err = err_irq;
+			goto fail;
+		}
+
+		tx_irq = platform_get_irq_byname(pdev, ch == 0 ? "ch0_trx" : "ch1_trx");
+		if (tx_irq < 0) {
+			err = tx_irq;
+			goto fail;
+		}
+
+		irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+					  "canfd.ch%d_err", ch);
+		if (!irq_name) {
+			err = -ENOMEM;
+			goto fail;
+		}
+		err = devm_request_irq(&pdev->dev, err_irq,
+				       rcar_canfd_channel_err_interrupt, 0,
+				       irq_name, priv);
+		if (err) {
+			dev_err(&pdev->dev, "devm_request_irq CH Err(%d) failed, error %d\n",
+				err_irq, err);
+			goto fail;
+		}
+		irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+					  "canfd.ch%d_trx", ch);
+		if (!irq_name) {
+			err = -ENOMEM;
+			goto fail;
+		}
+		err = devm_request_irq(&pdev->dev, tx_irq,
+				       rcar_canfd_channel_tx_interrupt, 0,
+				       irq_name, priv);
+		if (err) {
+			dev_err(&pdev->dev, "devm_request_irq Tx (%d) failed, error %d\n",
+				tx_irq, err);
+			goto fail;
+		}
+	}
+
+	if (gpriv->fdmode) {
+		priv->can.bittiming_const = &rcar_canfd_nom_bittiming_const;
+		priv->can.data_bittiming_const =
+			&rcar_canfd_data_bittiming_const;
+
+		/* Controller starts in CAN FD only mode */
+		err = can_set_static_ctrlmode(ndev, CAN_CTRLMODE_FD);
+		if (err)
+			goto fail;
+		priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING;
+	} else {
+		/* Controller starts in Classical CAN only mode */
+		priv->can.bittiming_const = &rcar_canfd_bittiming_const;
+		priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING;
+	}
+
+	priv->can.do_set_mode = rcar_canfd_do_set_mode;
+	priv->can.do_get_berr_counter = rcar_canfd_get_berr_counter;
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+
+	netif_napi_add_weight(ndev, &priv->napi, rcar_canfd_rx_poll,
+			      RCANFD_NAPI_WEIGHT);
+	spin_lock_init(&priv->tx_lock);
+	gpriv->ch[priv->channel] = priv;
+	err = register_candev(ndev);
+	if (err) {
+		dev_err(&pdev->dev,
+			"register_candev() failed, error %d\n", err);
+		goto fail_candev;
+	}
+	dev_info(&pdev->dev, "device registered (channel %u)\n", priv->channel);
+	return 0;
+
+fail_candev:
+	netif_napi_del(&priv->napi);
+fail:
+	free_candev(ndev);
+	return err;
+}
+
+static void rcar_canfd_channel_remove(struct rcar_canfd_global *gpriv, u32 ch)
+{
+	struct rcar_canfd_channel *priv = gpriv->ch[ch];
+
+	if (priv) {
+		unregister_candev(priv->ndev);
+		netif_napi_del(&priv->napi);
+		free_candev(priv->ndev);
+	}
+}
+
+static int rcar_canfd_probe(struct platform_device *pdev)
+{
+	void __iomem *addr;
+	u32 sts, ch, fcan_freq;
+	struct rcar_canfd_global *gpriv;
+	struct device_node *of_child;
+	unsigned long channels_mask = 0;
+	int err, ch_irq, g_irq;
+	int g_err_irq, g_recc_irq;
+	bool fdmode = true;			/* CAN FD only mode - default */
+	enum rcanfd_chip_id chip_id;
+	int max_channels;
+	char name[9] = "channelX";
+	int i;
+
+	chip_id = (uintptr_t)of_device_get_match_data(&pdev->dev);
+	max_channels = chip_id == RENESAS_R8A779A0 ? 8 : 2;
+
+	if (of_property_read_bool(pdev->dev.of_node, "renesas,no-can-fd"))
+		fdmode = false;			/* Classical CAN only mode */
+
+	for (i = 0; i < max_channels; ++i) {
+		name[7] = '0' + i;
+		of_child = of_get_child_by_name(pdev->dev.of_node, name);
+		if (of_child && of_device_is_available(of_child))
+			channels_mask |= BIT(i);
+		of_node_put(of_child);
+	}
+
+	if (chip_id != RENESAS_RZG2L) {
+		ch_irq = platform_get_irq_byname_optional(pdev, "ch_int");
+		if (ch_irq < 0) {
+			/* For backward compatibility get irq by index */
+			ch_irq = platform_get_irq(pdev, 0);
+			if (ch_irq < 0)
+				return ch_irq;
+		}
+
+		g_irq = platform_get_irq_byname_optional(pdev, "g_int");
+		if (g_irq < 0) {
+			/* For backward compatibility get irq by index */
+			g_irq = platform_get_irq(pdev, 1);
+			if (g_irq < 0)
+				return g_irq;
+		}
+	} else {
+		g_err_irq = platform_get_irq_byname(pdev, "g_err");
+		if (g_err_irq < 0)
+			return g_err_irq;
+
+		g_recc_irq = platform_get_irq_byname(pdev, "g_recc");
+		if (g_recc_irq < 0)
+			return g_recc_irq;
+	}
+
+	/* Global controller context */
+	gpriv = devm_kzalloc(&pdev->dev, sizeof(*gpriv), GFP_KERNEL);
+	if (!gpriv)
+		return -ENOMEM;
+
+	gpriv->pdev = pdev;
+	gpriv->channels_mask = channels_mask;
+	gpriv->fdmode = fdmode;
+	gpriv->chip_id = chip_id;
+	gpriv->max_channels = max_channels;
+
+	if (gpriv->chip_id == RENESAS_RZG2L) {
+		gpriv->rstc1 = devm_reset_control_get_exclusive(&pdev->dev, "rstp_n");
+		if (IS_ERR(gpriv->rstc1))
+			return dev_err_probe(&pdev->dev, PTR_ERR(gpriv->rstc1),
+					     "failed to get rstp_n\n");
+
+		gpriv->rstc2 = devm_reset_control_get_exclusive(&pdev->dev, "rstc_n");
+		if (IS_ERR(gpriv->rstc2))
+			return dev_err_probe(&pdev->dev, PTR_ERR(gpriv->rstc2),
+					     "failed to get rstc_n\n");
+	}
+
+	/* Peripheral clock */
+	gpriv->clkp = devm_clk_get(&pdev->dev, "fck");
+	if (IS_ERR(gpriv->clkp))
+		return dev_err_probe(&pdev->dev, PTR_ERR(gpriv->clkp),
+				     "cannot get peripheral clock\n");
+
+	/* fCAN clock: Pick External clock. If not available fallback to
+	 * CANFD clock
+	 */
+	gpriv->can_clk = devm_clk_get(&pdev->dev, "can_clk");
+	if (IS_ERR(gpriv->can_clk) || (clk_get_rate(gpriv->can_clk) == 0)) {
+		gpriv->can_clk = devm_clk_get(&pdev->dev, "canfd");
+		if (IS_ERR(gpriv->can_clk))
+			return dev_err_probe(&pdev->dev, PTR_ERR(gpriv->can_clk),
+					     "cannot get canfd clock\n");
+
+		gpriv->fcan = RCANFD_CANFDCLK;
+
+	} else {
+		gpriv->fcan = RCANFD_EXTCLK;
+	}
+	fcan_freq = clk_get_rate(gpriv->can_clk);
+
+	if (gpriv->fcan == RCANFD_CANFDCLK && gpriv->chip_id != RENESAS_RZG2L)
+		/* CANFD clock is further divided by (1/2) within the IP */
+		fcan_freq /= 2;
+
+	addr = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(addr)) {
+		err = PTR_ERR(addr);
+		goto fail_dev;
+	}
+	gpriv->base = addr;
+
+	/* Request IRQ that's common for both channels */
+	if (gpriv->chip_id != RENESAS_RZG2L) {
+		err = devm_request_irq(&pdev->dev, ch_irq,
+				       rcar_canfd_channel_interrupt, 0,
+				       "canfd.ch_int", gpriv);
+		if (err) {
+			dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n",
+				ch_irq, err);
+			goto fail_dev;
+		}
+
+		err = devm_request_irq(&pdev->dev, g_irq,
+				       rcar_canfd_global_interrupt, 0,
+				       "canfd.g_int", gpriv);
+		if (err) {
+			dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n",
+				g_irq, err);
+			goto fail_dev;
+		}
+	} else {
+		err = devm_request_irq(&pdev->dev, g_recc_irq,
+				       rcar_canfd_global_receive_fifo_interrupt, 0,
+				       "canfd.g_recc", gpriv);
+
+		if (err) {
+			dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n",
+				g_recc_irq, err);
+			goto fail_dev;
+		}
+
+		err = devm_request_irq(&pdev->dev, g_err_irq,
+				       rcar_canfd_global_err_interrupt, 0,
+				       "canfd.g_err", gpriv);
+		if (err) {
+			dev_err(&pdev->dev, "devm_request_irq(%d) failed, error %d\n",
+				g_err_irq, err);
+			goto fail_dev;
+		}
+	}
+
+	err = reset_control_reset(gpriv->rstc1);
+	if (err)
+		goto fail_dev;
+	err = reset_control_reset(gpriv->rstc2);
+	if (err) {
+		reset_control_assert(gpriv->rstc1);
+		goto fail_dev;
+	}
+
+	/* Enable peripheral clock for register access */
+	err = clk_prepare_enable(gpriv->clkp);
+	if (err) {
+		dev_err(&pdev->dev,
+			"failed to enable peripheral clock, error %d\n", err);
+		goto fail_reset;
+	}
+
+	err = rcar_canfd_reset_controller(gpriv);
+	if (err) {
+		dev_err(&pdev->dev, "reset controller failed\n");
+		goto fail_clk;
+	}
+
+	/* Controller in Global reset & Channel reset mode */
+	rcar_canfd_configure_controller(gpriv);
+
+	/* Configure per channel attributes */
+	for_each_set_bit(ch, &gpriv->channels_mask, max_channels) {
+		/* Configure Channel's Rx fifo */
+		rcar_canfd_configure_rx(gpriv, ch);
+
+		/* Configure Channel's Tx (Common) fifo */
+		rcar_canfd_configure_tx(gpriv, ch);
+
+		/* Configure receive rules */
+		rcar_canfd_configure_afl_rules(gpriv, ch);
+	}
+
+	/* Configure common interrupts */
+	rcar_canfd_enable_global_interrupts(gpriv);
+
+	/* Start Global operation mode */
+	rcar_canfd_update_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GMDC_MASK,
+			      RCANFD_GCTR_GMDC_GOPM);
+
+	/* Verify mode change */
+	err = readl_poll_timeout((gpriv->base + RCANFD_GSTS), sts,
+				 !(sts & RCANFD_GSTS_GNOPM), 2, 500000);
+	if (err) {
+		dev_err(&pdev->dev, "global operational mode failed\n");
+		goto fail_mode;
+	}
+
+	for_each_set_bit(ch, &gpriv->channels_mask, max_channels) {
+		err = rcar_canfd_channel_probe(gpriv, ch, fcan_freq);
+		if (err)
+			goto fail_channel;
+	}
+
+	platform_set_drvdata(pdev, gpriv);
+	dev_info(&pdev->dev, "global operational state (clk %d, fdmode %d)\n",
+		 gpriv->fcan, gpriv->fdmode);
+	return 0;
+
+fail_channel:
+	for_each_set_bit(ch, &gpriv->channels_mask, max_channels)
+		rcar_canfd_channel_remove(gpriv, ch);
+fail_mode:
+	rcar_canfd_disable_global_interrupts(gpriv);
+fail_clk:
+	clk_disable_unprepare(gpriv->clkp);
+fail_reset:
+	reset_control_assert(gpriv->rstc1);
+	reset_control_assert(gpriv->rstc2);
+fail_dev:
+	return err;
+}
+
+static int rcar_canfd_remove(struct platform_device *pdev)
+{
+	struct rcar_canfd_global *gpriv = platform_get_drvdata(pdev);
+	u32 ch;
+
+	rcar_canfd_reset_controller(gpriv);
+	rcar_canfd_disable_global_interrupts(gpriv);
+
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+		rcar_canfd_disable_channel_interrupts(gpriv->ch[ch]);
+		rcar_canfd_channel_remove(gpriv, ch);
+	}
+
+	/* Enter global sleep mode */
+	rcar_canfd_set_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GSLPR);
+	clk_disable_unprepare(gpriv->clkp);
+	reset_control_assert(gpriv->rstc1);
+	reset_control_assert(gpriv->rstc2);
+
+	return 0;
+}
+
+static int __maybe_unused rcar_canfd_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int __maybe_unused rcar_canfd_resume(struct device *dev)
+{
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_canfd_pm_ops, rcar_canfd_suspend,
+			 rcar_canfd_resume);
+
+static const __maybe_unused struct of_device_id rcar_canfd_of_table[] = {
+	{ .compatible = "renesas,rcar-gen3-canfd", .data = (void *)RENESAS_RCAR_GEN3 },
+	{ .compatible = "renesas,rzg2l-canfd", .data = (void *)RENESAS_RZG2L },
+	{ .compatible = "renesas,r8a779a0-canfd", .data = (void *)RENESAS_R8A779A0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, rcar_canfd_of_table);
+
+static struct platform_driver rcar_canfd_driver = {
+	.driver = {
+		.name = RCANFD_DRV_NAME,
+		.of_match_table = of_match_ptr(rcar_canfd_of_table),
+		.pm = &rcar_canfd_pm_ops,
+	},
+	.probe = rcar_canfd_probe,
+	.remove = rcar_canfd_remove,
+};
+
+module_platform_driver(rcar_canfd_driver);
+
+MODULE_AUTHOR("Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CAN FD driver for Renesas R-Car SoC");
+MODULE_ALIAS("platform:" RCANFD_DRV_NAME);