Resguardo inicial

linux-7.2.3/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.

linux-7.2.3/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

linux-7.2.3/drivers/net/can/rcar/rcar_can.c

@@ -0,0 +1,917 @@
+// 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/bitfield.h>
+#include <linux/bits.h>
+#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>
+#include <linux/pm_runtime.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 *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	GENMASK(12, 11)	/* Bus-Off Recovery Mode Bits */
+#define RCAR_CAN_CTLR_BOM_ENT		1	/* Entry to halt mode */
+						/* at bus-off entry */
+#define RCAR_CAN_CTLR_SLPM	BIT(10)		/* Sleep Mode */
+#define RCAR_CAN_CTLR_CANM	GENMASK(9, 8)	/* Operating Mode Select Bit */
+#define RCAR_CAN_CTLR_CANM_OPER		0	/* Operation Mode */
+#define RCAR_CAN_CTLR_CANM_RESET	1	/* Reset Mode */
+#define RCAR_CAN_CTLR_CANM_HALT		2	/* Halt Mode */
+#define RCAR_CAN_CTLR_CANM_FORCE_RESET	3	/* Reset Mode (forcible) */
+#define RCAR_CAN_CTLR_MLM	BIT(3)		/* Message Lost Mode Select */
+#define RCAR_CAN_CTLR_IDFM	GENMASK(2, 1)	/* ID Format Mode Select Bits */
+#define RCAR_CAN_CTLR_IDFM_STD		0	/* Standard ID mode */
+#define RCAR_CAN_CTLR_IDFM_EXT		1	/* Extended ID mode */
+#define RCAR_CAN_CTLR_IDFM_MIXED	2	/* Mixed ID mode */
+#define RCAR_CAN_CTLR_MBM	BIT(0)		/* Mailbox Mode select */
+
+/* Status Register bits */
+#define RCAR_CAN_STR_RSTST	BIT(8)		/* Reset Status Bit */
+
+/* FIFO Received ID Compare Registers 0 and 1 bits */
+#define RCAR_CAN_FIDCR_IDE	BIT(31)		/* ID Extension Bit */
+#define RCAR_CAN_FIDCR_RTR	BIT(30)		/* Remote Transmission Request Bit */
+
+/* Receive FIFO Control Register bits */
+#define RCAR_CAN_RFCR_RFEST	BIT(7)		/* Receive FIFO Empty Status Flag */
+#define RCAR_CAN_RFCR_RFE	BIT(0)		/* Receive FIFO Enable */
+
+/* Transmit FIFO Control Register bits */
+#define RCAR_CAN_TFCR_TFUST	GENMASK(3, 1)	/* Transmit FIFO Unsent Message */
+						/* Number Status Bits */
+#define RCAR_CAN_TFCR_TFE	BIT(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	GENMASK(23, 20)
+#define RCAR_CAN_BCR_BRP	GENMASK(17, 8)
+#define RCAR_CAN_BCR_SJW	GENMASK(5, 4)
+#define RCAR_CAN_BCR_TSEG2	GENMASK(2, 0)
+
+/* Mailbox and Mask Registers bits */
+#define RCAR_CAN_IDE		BIT(31)		/* ID Extension */
+#define RCAR_CAN_RTR		BIT(30)		/* Remote Transmission Request */
+#define RCAR_CAN_SID		GENMASK(28, 18)	/* Standard ID */
+#define RCAR_CAN_EID		GENMASK(28, 0)	/* Extended ID */
+
+/* Mailbox Interrupt Enable Register 1 bits */
+#define RCAR_CAN_MIER1_RXFIE	BIT(28)		/* Receive  FIFO Interrupt Enable */
+#define RCAR_CAN_MIER1_TXFIE	BIT(24)		/* Transmit FIFO Interrupt Enable */
+
+/* Interrupt Enable Register bits */
+#define RCAR_CAN_IER_ERSIE	BIT(5)		/* Error (ERS) Interrupt Enable Bit */
+#define RCAR_CAN_IER_RXFIE	BIT(4)		/* Reception FIFO Interrupt */
+						/* Enable Bit */
+#define RCAR_CAN_IER_TXFIE	BIT(3)		/* Transmission FIFO Interrupt */
+						/* Enable Bit */
+/* Interrupt Status Register bits */
+#define RCAR_CAN_ISR_ERSF	BIT(5)		/* Error (ERS) Interrupt Status Bit */
+#define RCAR_CAN_ISR_RXFF	BIT(4)		/* Reception FIFO Interrupt */
+						/* Status Bit */
+#define RCAR_CAN_ISR_TXFF	BIT(3)		/* Transmission FIFO Interrupt */
+						/* Status Bit */
+
+/* Error Interrupt Enable Register bits */
+#define RCAR_CAN_EIER_BLIE	BIT(7)		/* Bus Lock Interrupt Enable */
+#define RCAR_CAN_EIER_OLIE	BIT(6)		/* Overload Frame Transmit */
+						/* Interrupt Enable */
+#define RCAR_CAN_EIER_ORIE	BIT(5)		/* Receive Overrun  Interrupt Enable */
+#define RCAR_CAN_EIER_BORIE	BIT(4)		/* Bus-Off Recovery Interrupt Enable */
+#define RCAR_CAN_EIER_BOEIE	BIT(3)		/* Bus-Off Entry Interrupt Enable */
+#define RCAR_CAN_EIER_EPIE	BIT(2)		/* Error Passive Interrupt Enable */
+#define RCAR_CAN_EIER_EWIE	BIT(1)		/* Error Warning Interrupt Enable */
+#define RCAR_CAN_EIER_BEIE	BIT(0)		/* Bus Error Interrupt Enable */
+
+/* Error Interrupt Factor Judge Register bits */
+#define RCAR_CAN_EIFR_BLIF	BIT(7)		/* Bus Lock Detect Flag */
+#define RCAR_CAN_EIFR_OLIF	BIT(6)		/* Overload Frame Transmission */
+						/* Detect Flag */
+#define RCAR_CAN_EIFR_ORIF	BIT(5)		/* Receive Overrun Detect Flag */
+#define RCAR_CAN_EIFR_BORIF	BIT(4)		/* Bus-Off Recovery Detect Flag */
+#define RCAR_CAN_EIFR_BOEIF	BIT(3)		/* Bus-Off Entry Detect Flag */
+#define RCAR_CAN_EIFR_EPIF	BIT(2)		/* Error Passive Detect Flag */
+#define RCAR_CAN_EIFR_EWIF	BIT(1)		/* Error Warning Detect Flag */
+#define RCAR_CAN_EIFR_BEIF	BIT(0)		/* Bus Error Detect Flag */
+
+/* Error Code Store Register bits */
+#define RCAR_CAN_ECSR_EDPM	BIT(7)		/* Error Display Mode Select Bit */
+#define RCAR_CAN_ECSR_ADEF	BIT(6)		/* ACK Delimiter Error Flag */
+#define RCAR_CAN_ECSR_BE0F	BIT(5)		/* Bit Error (dominant) Flag */
+#define RCAR_CAN_ECSR_BE1F	BIT(4)		/* Bit Error (recessive) Flag */
+#define RCAR_CAN_ECSR_CEF	BIT(3)		/* CRC Error Flag */
+#define RCAR_CAN_ECSR_AEF	BIT(2)		/* ACK Error Flag */
+#define RCAR_CAN_ECSR_FEF	BIT(1)		/* Form Error Flag */
+#define RCAR_CAN_ECSR_SEF	BIT(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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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((u8)~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 = FIELD_GET(RCAR_CAN_TFCR_TFUST,
+			    readb(&priv->regs->tfcr));
+
+		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 *ndev)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	struct can_bittiming *bt = &priv->can.bittiming;
+	u32 bcr;
+
+	bcr = FIELD_PREP(RCAR_CAN_BCR_TSEG1, bt->phase_seg1 + bt->prop_seg - 1) |
+	      FIELD_PREP(RCAR_CAN_BCR_BRP, bt->brp - 1) |
+	      FIELD_PREP(RCAR_CAN_BCR_SJW, bt->sjw - 1) |
+	      FIELD_PREP(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 |= FIELD_PREP(RCAR_CAN_CTLR_CANM, 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);
+	/* Select mixed ID mode */
+	ctlr |= FIELD_PREP(RCAR_CAN_CTLR_IDFM, RCAR_CAN_CTLR_IDFM_MIXED);
+	/* Entry to halt mode automatically at bus-off */
+	ctlr |= FIELD_PREP(RCAR_CAN_CTLR_BOM, RCAR_CAN_CTLR_BOM_ENT);
+	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 */
+	FIELD_MODIFY(RCAR_CAN_CTLR_CANM, &ctlr, RCAR_CAN_CTLR_CANM_OPER);
+	writew(ctlr, &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 = pm_runtime_resume_and_get(ndev->dev.parent);
+	if (err) {
+		netdev_err(ndev, "pm_runtime_resume_and_get() failed %pe\n",
+			   ERR_PTR(err));
+		goto out;
+	}
+	err = clk_prepare_enable(priv->can_clk);
+	if (err) {
+		netdev_err(ndev, "failed to enable CAN clock: %pe\n",
+			   ERR_PTR(err));
+		goto out_rpm;
+	}
+	err = open_candev(ndev);
+	if (err) {
+		netdev_err(ndev, "open_candev() failed %pe\n", ERR_PTR(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 %pe\n", ndev->irq,
+			   ERR_PTR(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_rpm:
+	pm_runtime_put(ndev->dev.parent);
+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 |= FIELD_PREP(RCAR_CAN_CTLR_CANM, 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);
+	pm_runtime_put(ndev->dev.parent);
+	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 = FIELD_PREP(RCAR_CAN_EID, cf->can_id & CAN_EFF_MASK) |
+		       RCAR_CAN_IDE;
+	else				/* Standard frame format */
+		data = FIELD_PREP(RCAR_CAN_SID, cf->can_id & CAN_SFF_MASK);
+
+	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,
+};
+
+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 = FIELD_GET(RCAR_CAN_EID, data) | CAN_EFF_FLAG;
+	else
+		cf->can_id = FIELD_GET(RCAR_CAN_SID, data);
+
+	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 *ndev,
+				     struct can_berr_counter *bec)
+{
+	struct rcar_can_priv *priv = netdev_priv(ndev);
+	int err;
+
+	err = pm_runtime_resume_and_get(ndev->dev.parent);
+	if (err)
+		return err;
+
+	bec->txerr = readb(&priv->regs->tecr);
+	bec->rxerr = readb(&priv->regs->recr);
+
+	pm_runtime_put(ndev->dev.parent);
+
+	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 device *dev = &pdev->dev;
+	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(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) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	priv = netdev_priv(ndev);
+
+	if (!(BIT(clock_select) & RCAR_SUPPORTED_CLOCKS)) {
+		err = -EINVAL;
+		dev_err(dev, "invalid CAN clock selected\n");
+		goto fail_clk;
+	}
+	priv->can_clk = devm_clk_get(dev, clock_names[clock_select]);
+	if (IS_ERR(priv->can_clk)) {
+		dev_err(dev, "cannot get CAN clock: %pe\n", priv->can_clk);
+		err = PTR_ERR(priv->can_clk);
+		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, dev);
+
+	netif_napi_add_weight(ndev, &priv->napi, rcar_can_rx_poll,
+			      RCAR_CAN_NAPI_WEIGHT);
+
+	pm_runtime_enable(dev);
+
+	err = register_candev(ndev);
+	if (err) {
+		dev_err(dev, "register_candev() failed %pe\n", ERR_PTR(err));
+		goto fail_rpm;
+	}
+
+	dev_info(dev, "device registered (IRQ%d)\n", ndev->irq);
+
+	return 0;
+fail_rpm:
+	pm_runtime_disable(dev);
+	netif_napi_del(&priv->napi);
+fail_clk:
+	free_candev(ndev);
+fail:
+	return err;
+}
+
+static void 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);
+	pm_runtime_disable(&pdev->dev);
+	netif_napi_del(&priv->napi);
+	free_candev(ndev);
+}
+
+static int 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 |= FIELD_PREP(RCAR_CAN_CTLR_CANM, 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;
+
+	pm_runtime_put(dev);
+	return 0;
+}
+
+static int rcar_can_resume(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	int err;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	err = pm_runtime_resume_and_get(dev);
+	if (err) {
+		netdev_err(ndev, "pm_runtime_resume_and_get() failed %pe\n",
+			   ERR_PTR(err));
+		return err;
+	}
+
+	rcar_can_start(ndev);
+
+	netif_device_attach(ndev);
+	netif_start_queue(ndev);
+
+	return 0;
+}
+
+static DEFINE_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 = pm_sleep_ptr(&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);