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Message-ID: <20250924082104.595459-13-mkl@pengutronix.de>
Date: Wed, 24 Sep 2025 10:06:29 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
kuba@...nel.org,
linux-can@...r.kernel.org,
kernel@...gutronix.de,
Geert Uytterhoeven <geert+renesas@...der.be>,
Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 12/48] can: rcar_can: Convert to BIT()
From: Geert Uytterhoeven <geert+renesas@...der.be>
Use the BIT() macro instead of open-coding the same operation.
Add a few more comments while at it.
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Link: https://patch.msgid.link/78fb16beb74975f6f6140ec9abb48beb94fb0afa.1755857536.git.geert+renesas@glider.be
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
drivers/net/can/rcar/rcar_can.c | 137 ++++++++++++++++----------------
1 file changed, 69 insertions(+), 68 deletions(-)
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 15dbaa52a7b1..c47ee4e41eb6 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -5,6 +5,7 @@
* Copyright (C) 2013 Renesas Solutions Corp.
*/
+#include <linux/bits.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
@@ -116,36 +117,36 @@ static const struct can_bittiming_const rcar_can_bittiming_const = {
#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_SLPM BIT(10) /* Sleep Mode */
#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_MLM BIT(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 */
+#define RCAR_CAN_CTLR_MBM BIT(0) /* Mailbox Mode select */
/* Status Register bits */
-#define RCAR_CAN_STR_RSTST (1 << 8) /* Reset Status Bit */
+#define RCAR_CAN_STR_RSTST BIT(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 */
+#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 (1 << 7) /* Receive FIFO Empty Status Flag */
-#define RCAR_CAN_RFCR_RFE (1 << 0) /* Receive FIFO Enable */
+#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 (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_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 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_MKREGS1 2 /* Number of mask registers */
+ /* for Rx mailboxes 0-31 */
#define RCAR_CAN_N_RX_MKREGS2 8
/* Bit Configuration Register settings */
@@ -155,58 +156,58 @@ static const struct can_bittiming_const rcar_can_bittiming_const = {
#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_IDE BIT(31) /* ID Extension */
+#define RCAR_CAN_RTR BIT(30) /* Remote Transmission Request */
#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 */
+#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 (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 */
+#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 (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 */
+#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 (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 */
+#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 (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 */
+#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 (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_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
@@ -248,35 +249,35 @@ static void rcar_can_error(struct net_device *ndev)
if (ecsr & RCAR_CAN_ECSR_ADEF) {
netdev_dbg(priv->ndev, "ACK Delimiter Error\n");
tx_errors++;
- writeb(~RCAR_CAN_ECSR_ADEF, &priv->regs->ecsr);
+ 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(~RCAR_CAN_ECSR_BE0F, &priv->regs->ecsr);
+ 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(~RCAR_CAN_ECSR_BE1F, &priv->regs->ecsr);
+ 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(~RCAR_CAN_ECSR_CEF, &priv->regs->ecsr);
+ 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(~RCAR_CAN_ECSR_AEF, &priv->regs->ecsr);
+ 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;
@@ -285,14 +286,14 @@ static void rcar_can_error(struct net_device *ndev)
if (ecsr & RCAR_CAN_ECSR_FEF) {
netdev_dbg(priv->ndev, "Form Error\n");
rx_errors++;
- writeb(~RCAR_CAN_ECSR_FEF, &priv->regs->ecsr);
+ 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(~RCAR_CAN_ECSR_SEF, &priv->regs->ecsr);
+ writeb((u8)~RCAR_CAN_ECSR_SEF, &priv->regs->ecsr);
if (skb)
cf->data[2] |= CAN_ERR_PROT_STUFF;
}
@@ -300,14 +301,14 @@ static void rcar_can_error(struct net_device *ndev)
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);
+ 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(~RCAR_CAN_EIFR_EWIF, &priv->regs->eifr);
+ 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;
@@ -317,7 +318,7 @@ static void rcar_can_error(struct net_device *ndev)
priv->can.state = CAN_STATE_ERROR_PASSIVE;
priv->can.can_stats.error_passive++;
/* Clear interrupt condition */
- writeb(~RCAR_CAN_EIFR_EPIF, &priv->regs->eifr);
+ 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;
@@ -329,7 +330,7 @@ static void rcar_can_error(struct net_device *ndev)
writeb(priv->ier, &priv->regs->ier);
priv->can.state = CAN_STATE_BUS_OFF;
/* Clear interrupt condition */
- writeb(~RCAR_CAN_EIFR_BOEIF, &priv->regs->eifr);
+ writeb((u8)~RCAR_CAN_EIFR_BOEIF, &priv->regs->eifr);
priv->can.can_stats.bus_off++;
can_bus_off(ndev);
if (skb)
@@ -343,7 +344,7 @@ static void rcar_can_error(struct net_device *ndev)
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);
+ 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;
@@ -354,7 +355,7 @@ static void rcar_can_error(struct net_device *ndev)
"Overload Frame Transmission error interrupt\n");
ndev->stats.rx_over_errors++;
ndev->stats.rx_errors++;
- writeb(~RCAR_CAN_EIFR_OLIF, &priv->regs->eifr);
+ writeb((u8)~RCAR_CAN_EIFR_OLIF, &priv->regs->eifr);
if (skb) {
cf->can_id |= CAN_ERR_PROT;
cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
--
2.51.0
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