[PATCH v4 0/6] Remodel FlexCAN register r/w APIs for big endian

[PATCH v4 0/6] Remodel FlexCAN register r/w APIs for big endian

[Pankaj Bansal]

This patch series remodels the FlexCAN register r/w APIs for big endian.
The endianness is checked based on optional big-endian property in
device tree. if this property is not present in device tree node then 
controller is assumed to be little endian. if this property is present then
controller is assumed to be big endian.

An exception to this rule is powerpc P1010RDB, which is always
big-endian, even if big-endian is not present in dts. This is
checked using p1010-flexcan compatible in dts.

Therefore, remove p1010-flexcan compatible from imx series dts,
as their flexcan core is little endian.

Finally this series adds support for NXP LS1021A SOC in flexcan,
which is arm based SOC having big-endian FlexCAN controller.

Pankaj Bansal (6):
  can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN
    controllers.
  can: flexcan: adding platform specific details for LS1021A
  Documentation : can : flexcan : Add big-endian property to device tree
  powerpc: dts: P1010: Add endianness property to flexcan node
  arm: dts: Remove p1010-flexcan compatible from imx series dts
  arm/dts: Add nodes for flexcan devices present on LS1021A-Rev2 SoC

 .../bindings/net/can/fsl-flexcan.txt         |   6 +
 arch/arm/boot/dts/imx25.dtsi                 |   4 +-
 arch/arm/boot/dts/imx28.dtsi                 |   4 +-
 arch/arm/boot/dts/imx35.dtsi                 |   4 +-
 arch/arm/boot/dts/imx53.dtsi                 |   4 +-
 arch/arm/boot/dts/ls1021a-qds.dts            |  16 ++
 arch/arm/boot/dts/ls1021a-twr.dts            |  16 ++
 arch/arm/boot/dts/ls1021a.dtsi               |  36 +++
 arch/powerpc/boot/dts/fsl/p1010si-post.dtsi  |   2 +
 drivers/net/can/flexcan.c                    | 241 ++++++++++-------
 10 files changed, 223 insertions(+), 110 deletions(-)

-- 
2.7.4

[PATCH v4 4/6] powerpc: dts: P1010: Add endianness property to flexcan node

[Pankaj Bansal]

The flexcan driver assumed that flexcan controller is big endian for
powerpc architecture and little endian for other architectures.

But this is not universally true. flexcan controller can be little or
big endian on any architecture.

Therefore the flexcan driver has been modified to check for "big-endian"
device tree property for controllers that are big endian.

consequently add the property to freescale P1010 SOC device tree.

Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
Reviewed-by: Poonam Aggrwal <poonam.aggrwal@nxp.com>
---
Changes in v4:
  - Merged device tree changes and driver changes in one series
Changes in v3:
  - No change.
Changes in v2:
  - No change.
  - Added one more patch in series.

 arch/powerpc/boot/dts/fsl/p1010si-post.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
index af12ead..1b4aafc 100644
--- a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
@@ -137,12 +137,14 @@
 		compatible = "fsl,p1010-flexcan";
 		reg = <0x1c000 0x1000>;
 		interrupts = <48 0x2 0 0>;
+		big-endian;
 	};
 
 	can1: can@1d000 {
 		compatible = "fsl,p1010-flexcan";
 		reg = <0x1d000 0x1000>;
 		interrupts = <61 0x2 0 0>;
+		big-endian;
 	};
 
 	L2: l2-cache-controller@20000 {
-- 
2.7.4

[PATCH v4 5/6] arm: dts: Remove p1010-flexcan compatible from imx series dts

[Pankaj Bansal]

The flexcan driver has been modified to check for big-endian dts
property for be read/write to flexcan registers/mb.

An exception to this rule is powerpc P1010RDB, which is always
big-endian, even if big-endian is not present in dts. This is
checked using p1010-flexcan compatible in dts.

Therefore, remove p1010-flexcan compatible from imx series dts,
as their flexcan core is little endian.

Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
---
Changes in v4:
  - Merged device tree changes and driver changes in one series
Changes in v3:
  - No change.
Changes in v2:
  - Add this patch in series.

 arch/arm/boot/dts/imx25.dtsi | 4 ++--
 arch/arm/boot/dts/imx28.dtsi | 4 ++--
 arch/arm/boot/dts/imx35.dtsi | 4 ++--
 arch/arm/boot/dts/imx53.dtsi | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/arm/boot/dts/imx25.dtsi b/arch/arm/boot/dts/imx25.dtsi
index 09ce8b8..fcaff1c 100644
--- a/arch/arm/boot/dts/imx25.dtsi
+++ b/arch/arm/boot/dts/imx25.dtsi
@@ -122,7 +122,7 @@
 			};
 
 			can1: can@43f88000 {
-				compatible = "fsl,imx25-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx25-flexcan";
 				reg = <0x43f88000 0x4000>;
 				interrupts = <43>;
 				clocks = <&clks 75>, <&clks 75>;
@@ -131,7 +131,7 @@
 			};
 
 			can2: can@43f8c000 {
-				compatible = "fsl,imx25-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx25-flexcan";
 				reg = <0x43f8c000 0x4000>;
 				interrupts = <44>;
 				clocks = <&clks 76>, <&clks 76>;
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 2f4ebe0..e52e05c 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -1038,7 +1038,7 @@
 			};
 
 			can0: can@80032000 {
-				compatible = "fsl,imx28-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx28-flexcan";
 				reg = <0x80032000 0x2000>;
 				interrupts = <8>;
 				clocks = <&clks 58>, <&clks 58>;
@@ -1047,7 +1047,7 @@
 			};
 
 			can1: can@80034000 {
-				compatible = "fsl,imx28-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx28-flexcan";
 				reg = <0x80034000 0x2000>;
 				interrupts = <9>;
 				clocks = <&clks 59>, <&clks 59>;
diff --git a/arch/arm/boot/dts/imx35.dtsi b/arch/arm/boot/dts/imx35.dtsi
index 6d5e6a6..1f0e220 100644
--- a/arch/arm/boot/dts/imx35.dtsi
+++ b/arch/arm/boot/dts/imx35.dtsi
@@ -303,7 +303,7 @@
 			};
 
 			can1: can@53fe4000 {
-				compatible = "fsl,imx35-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx35-flexcan";
 				reg = <0x53fe4000 0x1000>;
 				clocks = <&clks 33>, <&clks 33>;
 				clock-names = "ipg", "per";
@@ -312,7 +312,7 @@
 			};
 
 			can2: can@53fe8000 {
-				compatible = "fsl,imx35-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx35-flexcan";
 				reg = <0x53fe8000 0x1000>;
 				clocks = <&clks 34>, <&clks 34>;
 				clock-names = "ipg", "per";
diff --git a/arch/arm/boot/dts/imx53.dtsi b/arch/arm/boot/dts/imx53.dtsi
index 8bf0d89..85573cf 100644
--- a/arch/arm/boot/dts/imx53.dtsi
+++ b/arch/arm/boot/dts/imx53.dtsi
@@ -545,7 +545,7 @@
 			};
 
 			can1: can@53fc8000 {
-				compatible = "fsl,imx53-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx53-flexcan";
 				reg = <0x53fc8000 0x4000>;
 				interrupts = <82>;
 				clocks = <&clks IMX5_CLK_CAN1_IPG_GATE>,
@@ -555,7 +555,7 @@
 			};
 
 			can2: can@53fcc000 {
-				compatible = "fsl,imx53-flexcan", "fsl,p1010-flexcan";
+				compatible = "fsl,imx53-flexcan";
 				reg = <0x53fcc000 0x4000>;
 				interrupts = <83>;
 				clocks = <&clks IMX5_CLK_CAN2_IPG_GATE>,
-- 
2.7.4

[PATCH v4 1/6] can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN controllers.

[Pankaj Bansal]

The FlexCAN driver assumed that FlexCAN controller is big endian for
powerpc architecture and little endian for other architectures.

But this may not be the case. FlexCAN controller can be little or big
endian on any architecture. For e.g. NXP LS1021A ARM based SOC has big
endian FlexCAN controller.

Therefore, the driver has been modified to add a provision for both
types of controllers using an additional device tree property. On a
"fsl,p1010-flexcan" device BE is default, on all other devices LE is.

Big Endian controllers should have "big-endian" set in the device tree.
check "Documentation/devicetree/bindings/net/can/fsl-flexcan.txt" for
usage.

This is the standard practice followed in linux. for more info check:
Documentation/devicetree/bindings/common-properties.txt

Signed-off-by: Pankaj Bansal <pankaj.bansal-3arQi8VN3Tc@public.gmane.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Signed-off-by: Sakar Arora <Sakar.Arora-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reviewed-by: Zhengxiong Jin <Jason.Jin-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reviewed-by: Poonam Aggrwal <poonam.aggrwal-3arQi8VN3Tc@public.gmane.org>
---
Changes in v4:
  - Merged device tree changes and driver changes in one series
Changes in v3:
  - Added fsl,imx25-flexcan, fsl,imx35-flexcan and fsl,imx53-flexcan
    support to the driver.
  - Modified patch deciption to state default endianness followed and
    to include fsl-flexcan.txt referance.
Changes in v2:
  - Modified patch deciption to include common-properties.txt reference.
  - Reorder the LE/BE read/write APIs for better readability of code
  - Added an exception to force BE API selection, for powerpc based platform
    P1010. This ensures that new linux kernel works with old P1010
    device-tree, while future powerpc platforms that use big endian
    FlexCAN controller need to specify big-endian in device tree in
    FlexCAN node.
  - Tested on P1010 after backporting to freescale sdk 1.4 linux, without
    any change in device-tree.
  - Tested on NXP LS1021A arm based platform.

 drivers/net/can/flexcan.c | 233 ++++++++++++++++++++----------------
 1 file changed, 131 insertions(+), 102 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index a13a489..4c873fb 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -279,6 +279,10 @@ struct flexcan_priv {
 	struct clk *clk_per;
 	const struct flexcan_devtype_data *devtype_data;
 	struct regulator *reg_xceiver;
+
+	/* Read and Write APIs */
+	u32 (*read)(void __iomem *addr);
+	void (*write)(u32 val, void __iomem *addr);
 };
 
 static const struct flexcan_devtype_data fsl_p1010_devtype_data = {
@@ -312,39 +316,45 @@ static const struct can_bittiming_const flexcan_bittiming_const = {
 	.brp_inc = 1,
 };
 
-/* Abstract off the read/write for arm versus ppc. This
- * assumes that PPC uses big-endian registers and everything
- * else uses little-endian registers, independent of CPU
- * endianness.
+/* FlexCAN module is essentially modelled as a little-endian IP in most
+ * SoCs, i.e the registers as well as the message buffer areas are
+ * implemented in a little-endian fashion.
+ *
+ * However there are some SoCs (e.g. LS1021A) which implement the FlexCAN
+ * module in a big-endian fashion (i.e the registers as well as the
+ * message buffer areas are implemented in a big-endian way).
+ *
+ * In addition, the FlexCAN module can be found on SoCs having ARM or
+ * PPC cores. So, we need to abstract off the register read/write
+ * functions, ensuring that these cater to all the combinations of module
+ * endianness and underlying CPU endianness.
  */
-#if defined(CONFIG_PPC)
-static inline u32 flexcan_read(void __iomem *addr)
+static inline u32 flexcan_read_be(void __iomem *addr)
 {
-	return in_be32(addr);
+	return ioread32be(addr);
 }
 
-static inline void flexcan_write(u32 val, void __iomem *addr)
+static inline void flexcan_write_be(u32 val, void __iomem *addr)
 {
-	out_be32(addr, val);
+	iowrite32be(val, addr);
 }
-#else
-static inline u32 flexcan_read(void __iomem *addr)
+
+static inline u32 flexcan_read_le(void __iomem *addr)
 {
-	return readl(addr);
+	return ioread32(addr);
 }
 
-static inline void flexcan_write(u32 val, void __iomem *addr)
+static inline void flexcan_write_le(u32 val, void __iomem *addr)
 {
-	writel(val, addr);
+	iowrite32(val, addr);
 }
-#endif
 
 static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv)
 {
 	struct flexcan_regs __iomem *regs = priv->regs;
 	u32 reg_ctrl = (priv->reg_ctrl_default | FLEXCAN_CTRL_ERR_MSK);
 
-	flexcan_write(reg_ctrl, &regs->ctrl);
+	priv->write(reg_ctrl, &regs->ctrl);
 }
 
 static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv)
@@ -352,7 +362,7 @@ static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv)
 	struct flexcan_regs __iomem *regs = priv->regs;
 	u32 reg_ctrl = (priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_MSK);
 
-	flexcan_write(reg_ctrl, &regs->ctrl);
+	priv->write(reg_ctrl, &regs->ctrl);
 }
 
 static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
@@ -377,14 +387,14 @@ static int flexcan_chip_enable(struct flexcan_priv *priv)
 	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 	u32 reg;
 
-	reg = flexcan_read(&regs->mcr);
+	reg = priv->read(&regs->mcr);
 	reg &= ~FLEXCAN_MCR_MDIS;
-	flexcan_write(reg, &regs->mcr);
+	priv->write(reg, &regs->mcr);
 
-	while (timeout-- && (flexcan_read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
+	while (timeout-- && (priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
 		udelay(10);
 
-	if (flexcan_read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK)
+	if (priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK)
 		return -ETIMEDOUT;
 
 	return 0;
@@ -396,14 +406,14 @@ static int flexcan_chip_disable(struct flexcan_priv *priv)
 	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 	u32 reg;
 
-	reg = flexcan_read(&regs->mcr);
+	reg = priv->read(&regs->mcr);
 	reg |= FLEXCAN_MCR_MDIS;
-	flexcan_write(reg, &regs->mcr);
+	priv->write(reg, &regs->mcr);
 
-	while (timeout-- && !(flexcan_read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
+	while (timeout-- && !(priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
 		udelay(10);
 
-	if (!(flexcan_read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
+	if (!(priv->read(&regs->mcr) & FLEXCAN_MCR_LPM_ACK))
 		return -ETIMEDOUT;
 
 	return 0;
@@ -415,14 +425,14 @@ static int flexcan_chip_freeze(struct flexcan_priv *priv)
 	unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate;
 	u32 reg;
 
-	reg = flexcan_read(&regs->mcr);
+	reg = priv->read(&regs->mcr);
 	reg |= FLEXCAN_MCR_HALT;
-	flexcan_write(reg, &regs->mcr);
+	priv->write(reg, &regs->mcr);
 
-	while (timeout-- && !(flexcan_read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
+	while (timeout-- && !(priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
 		udelay(100);
 
-	if (!(flexcan_read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
+	if (!(priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
 		return -ETIMEDOUT;
 
 	return 0;
@@ -434,14 +444,14 @@ static int flexcan_chip_unfreeze(struct flexcan_priv *priv)
 	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 	u32 reg;
 
-	reg = flexcan_read(&regs->mcr);
+	reg = priv->read(&regs->mcr);
 	reg &= ~FLEXCAN_MCR_HALT;
-	flexcan_write(reg, &regs->mcr);
+	priv->write(reg, &regs->mcr);
 
-	while (timeout-- && (flexcan_read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
+	while (timeout-- && (priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK))
 		udelay(10);
 
-	if (flexcan_read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK)
+	if (priv->read(&regs->mcr) & FLEXCAN_MCR_FRZ_ACK)
 		return -ETIMEDOUT;
 
 	return 0;
@@ -452,11 +462,11 @@ static int flexcan_chip_softreset(struct flexcan_priv *priv)
 	struct flexcan_regs __iomem *regs = priv->regs;
 	unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
 
-	flexcan_write(FLEXCAN_MCR_SOFTRST, &regs->mcr);
-	while (timeout-- && (flexcan_read(&regs->mcr) & FLEXCAN_MCR_SOFTRST))
+	priv->write(FLEXCAN_MCR_SOFTRST, &regs->mcr);
+	while (timeout-- && (priv->read(&regs->mcr) & FLEXCAN_MCR_SOFTRST))
 		udelay(10);
 
-	if (flexcan_read(&regs->mcr) & FLEXCAN_MCR_SOFTRST)
+	if (priv->read(&regs->mcr) & FLEXCAN_MCR_SOFTRST)
 		return -ETIMEDOUT;
 
 	return 0;
@@ -467,7 +477,7 @@ static int __flexcan_get_berr_counter(const struct net_device *dev,
 {
 	const struct flexcan_priv *priv = netdev_priv(dev);
 	struct flexcan_regs __iomem *regs = priv->regs;
-	u32 reg = flexcan_read(&regs->ecr);
+	u32 reg = priv->read(&regs->ecr);
 
 	bec->txerr = (reg >> 0) & 0xff;
 	bec->rxerr = (reg >> 8) & 0xff;
@@ -523,24 +533,24 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	if (cf->can_dlc > 0) {
 		data = be32_to_cpup((__be32 *)&cf->data[0]);
-		flexcan_write(data, &priv->tx_mb->data[0]);
+		priv->write(data, &priv->tx_mb->data[0]);
 	}
 	if (cf->can_dlc > 3) {
 		data = be32_to_cpup((__be32 *)&cf->data[4]);
-		flexcan_write(data, &priv->tx_mb->data[1]);
+		priv->write(data, &priv->tx_mb->data[1]);
 	}
 
 	can_put_echo_skb(skb, dev, 0);
 
-	flexcan_write(can_id, &priv->tx_mb->can_id);
-	flexcan_write(ctrl, &priv->tx_mb->can_ctrl);
+	priv->write(can_id, &priv->tx_mb->can_id);
+	priv->write(ctrl, &priv->tx_mb->can_ctrl);
 
 	/* Errata ERR005829 step8:
 	 * Write twice INACTIVE(0x8) code to first MB.
 	 */
-	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
+	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
 		      &priv->tx_mb_reserved->can_ctrl);
-	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
+	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
 		      &priv->tx_mb_reserved->can_ctrl);
 
 	return NETDEV_TX_OK;
@@ -659,7 +669,7 @@ static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload,
 		u32 code;
 
 		do {
-			reg_ctrl = flexcan_read(&mb->can_ctrl);
+			reg_ctrl = priv->read(&mb->can_ctrl);
 		} while (reg_ctrl & FLEXCAN_MB_CODE_RX_BUSY_BIT);
 
 		/* is this MB empty? */
@@ -674,17 +684,17 @@ static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload,
 			offload->dev->stats.rx_errors++;
 		}
 	} else {
-		reg_iflag1 = flexcan_read(&regs->iflag1);
+		reg_iflag1 = priv->read(&regs->iflag1);
 		if (!(reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE))
 			return 0;
 
-		reg_ctrl = flexcan_read(&mb->can_ctrl);
+		reg_ctrl = priv->read(&mb->can_ctrl);
 	}
 
 	/* increase timstamp to full 32 bit */
 	*timestamp = reg_ctrl << 16;
 
-	reg_id = flexcan_read(&mb->can_id);
+	reg_id = priv->read(&mb->can_id);
 	if (reg_ctrl & FLEXCAN_MB_CNT_IDE)
 		cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
 	else
@@ -694,19 +704,19 @@ static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload,
 		cf->can_id |= CAN_RTR_FLAG;
 	cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf);
 
-	*(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0]));
-	*(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1]));
+	*(__be32 *)(cf->data + 0) = cpu_to_be32(priv->read(&mb->data[0]));
+	*(__be32 *)(cf->data + 4) = cpu_to_be32(priv->read(&mb->data[1]));
 
 	/* mark as read */
 	if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
 		/* Clear IRQ */
 		if (n < 32)
-			flexcan_write(BIT(n), &regs->iflag1);
+			priv->write(BIT(n), &regs->iflag1);
 		else
-			flexcan_write(BIT(n - 32), &regs->iflag2);
+			priv->write(BIT(n - 32), &regs->iflag2);
 	} else {
-		flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, &regs->iflag1);
-		flexcan_read(&regs->timer);
+		priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, &regs->iflag1);
+		priv->read(&regs->timer);
 	}
 
 	return 1;
@@ -718,8 +728,8 @@ static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)
 	struct flexcan_regs __iomem *regs = priv->regs;
 	u32 iflag1, iflag2;
 
-	iflag2 = flexcan_read(&regs->iflag2) & priv->reg_imask2_default;
-	iflag1 = flexcan_read(&regs->iflag1) & priv->reg_imask1_default &
+	iflag2 = priv->read(&regs->iflag2) & priv->reg_imask2_default;
+	iflag1 = priv->read(&regs->iflag1) & priv->reg_imask1_default &
 		~FLEXCAN_IFLAG_MB(priv->tx_mb_idx);
 
 	return (u64)iflag2 << 32 | iflag1;
@@ -735,7 +745,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
 	u32 reg_iflag1, reg_esr;
 	enum can_state last_state = priv->can.state;
 
-	reg_iflag1 = flexcan_read(&regs->iflag1);
+	reg_iflag1 = priv->read(&regs->iflag1);
 
 	/* reception interrupt */
 	if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
@@ -758,7 +768,8 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
 		/* FIFO overflow interrupt */
 		if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) {
 			handled = IRQ_HANDLED;
-			flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, &regs->iflag1);
+			priv->write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW,
+				    &regs->iflag1);
 			dev->stats.rx_over_errors++;
 			dev->stats.rx_errors++;
 		}
@@ -772,18 +783,18 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
 		can_led_event(dev, CAN_LED_EVENT_TX);
 
 		/* after sending a RTR frame MB is in RX mode */
-		flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
-			      &priv->tx_mb->can_ctrl);
-		flexcan_write(FLEXCAN_IFLAG_MB(priv->tx_mb_idx), &regs->iflag1);
+		priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
+			    &priv->tx_mb->can_ctrl);
+		priv->write(FLEXCAN_IFLAG_MB(priv->tx_mb_idx), &regs->iflag1);
 		netif_wake_queue(dev);
 	}
 
-	reg_esr = flexcan_read(&regs->esr);
+	reg_esr = priv->read(&regs->esr);
 
 	/* ACK all bus error and state change IRQ sources */
 	if (reg_esr & FLEXCAN_ESR_ALL_INT) {
 		handled = IRQ_HANDLED;
-		flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, &regs->esr);
+		priv->write(reg_esr & FLEXCAN_ESR_ALL_INT, &regs->esr);
 	}
 
 	/* state change interrupt or broken error state quirk fix is enabled */
@@ -845,7 +856,7 @@ static void flexcan_set_bittiming(struct net_device *dev)
 	struct flexcan_regs __iomem *regs = priv->regs;
 	u32 reg;
 
-	reg = flexcan_read(&regs->ctrl);
+	reg = priv->read(&regs->ctrl);
 	reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) |
 		 FLEXCAN_CTRL_RJW(0x3) |
 		 FLEXCAN_CTRL_PSEG1(0x7) |
@@ -869,11 +880,11 @@ static void flexcan_set_bittiming(struct net_device *dev)
 		reg |= FLEXCAN_CTRL_SMP;
 
 	netdev_dbg(dev, "writing ctrl=0x%08x\n", reg);
-	flexcan_write(reg, &regs->ctrl);
+	priv->write(reg, &regs->ctrl);
 
 	/* print chip status */
 	netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__,
-		   flexcan_read(&regs->mcr), flexcan_read(&regs->ctrl));
+		   priv->read(&regs->mcr), priv->read(&regs->ctrl));
 }
 
 /* flexcan_chip_start
@@ -912,7 +923,7 @@ static int flexcan_chip_start(struct net_device *dev)
 	 * choose format C
 	 * set max mailbox number
 	 */
-	reg_mcr = flexcan_read(&regs->mcr);
+	reg_mcr = priv->read(&regs->mcr);
 	reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff);
 	reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | FLEXCAN_MCR_SUPV |
 		FLEXCAN_MCR_WRN_EN | FLEXCAN_MCR_SRX_DIS | FLEXCAN_MCR_IRMQ |
@@ -926,7 +937,7 @@ static int flexcan_chip_start(struct net_device *dev)
 			FLEXCAN_MCR_MAXMB(priv->tx_mb_idx);
 	}
 	netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr);
-	flexcan_write(reg_mcr, &regs->mcr);
+	priv->write(reg_mcr, &regs->mcr);
 
 	/* CTRL
 	 *
@@ -939,7 +950,7 @@ static int flexcan_chip_start(struct net_device *dev)
 	 * enable bus off interrupt
 	 * (== FLEXCAN_CTRL_ERR_STATE)
 	 */
-	reg_ctrl = flexcan_read(&regs->ctrl);
+	reg_ctrl = priv->read(&regs->ctrl);
 	reg_ctrl &= ~FLEXCAN_CTRL_TSYN;
 	reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF |
 		FLEXCAN_CTRL_ERR_STATE;
@@ -959,45 +970,45 @@ static int flexcan_chip_start(struct net_device *dev)
 	/* leave interrupts disabled for now */
 	reg_ctrl &= ~FLEXCAN_CTRL_ERR_ALL;
 	netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl);
-	flexcan_write(reg_ctrl, &regs->ctrl);
+	priv->write(reg_ctrl, &regs->ctrl);
 
 	if ((priv->devtype_data->quirks & FLEXCAN_QUIRK_ENABLE_EACEN_RRS)) {
-		reg_ctrl2 = flexcan_read(&regs->ctrl2);
+		reg_ctrl2 = priv->read(&regs->ctrl2);
 		reg_ctrl2 |= FLEXCAN_CTRL2_EACEN | FLEXCAN_CTRL2_RRS;
-		flexcan_write(reg_ctrl2, &regs->ctrl2);
+		priv->write(reg_ctrl2, &regs->ctrl2);
 	}
 
 	/* clear and invalidate all mailboxes first */
 	for (i = priv->tx_mb_idx; i < ARRAY_SIZE(regs->mb); i++) {
-		flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE,
-			      &regs->mb[i].can_ctrl);
+		priv->write(FLEXCAN_MB_CODE_RX_INACTIVE,
+			    &regs->mb[i].can_ctrl);
 	}
 
 	if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
 		for (i = priv->offload.mb_first; i <= priv->offload.mb_last; i++)
-			flexcan_write(FLEXCAN_MB_CODE_RX_EMPTY,
-				      &regs->mb[i].can_ctrl);
+			priv->write(FLEXCAN_MB_CODE_RX_EMPTY,
+				    &regs->mb[i].can_ctrl);
 	}
 
 	/* Errata ERR005829: mark first TX mailbox as INACTIVE */
-	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
-		      &priv->tx_mb_reserved->can_ctrl);
+	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
+		    &priv->tx_mb_reserved->can_ctrl);
 
 	/* mark TX mailbox as INACTIVE */
-	flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
-		      &priv->tx_mb->can_ctrl);
+	priv->write(FLEXCAN_MB_CODE_TX_INACTIVE,
+		    &priv->tx_mb->can_ctrl);
 
 	/* acceptance mask/acceptance code (accept everything) */
-	flexcan_write(0x0, &regs->rxgmask);
-	flexcan_write(0x0, &regs->rx14mask);
-	flexcan_write(0x0, &regs->rx15mask);
+	priv->write(0x0, &regs->rxgmask);
+	priv->write(0x0, &regs->rx14mask);
+	priv->write(0x0, &regs->rx15mask);
 
 	if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_RXFG)
-		flexcan_write(0x0, &regs->rxfgmask);
+		priv->write(0x0, &regs->rxfgmask);
 
 	/* clear acceptance filters */
 	for (i = 0; i < ARRAY_SIZE(regs->mb); i++)
-		flexcan_write(0, &regs->rximr[i]);
+		priv->write(0, &regs->rximr[i]);
 
 	/* On Vybrid, disable memory error detection interrupts
 	 * and freeze mode.
@@ -1010,16 +1021,16 @@ static int flexcan_chip_start(struct net_device *dev)
 		 * and Correction of Memory Errors" to write to
 		 * MECR register
 		 */
-		reg_ctrl2 = flexcan_read(&regs->ctrl2);
+		reg_ctrl2 = priv->read(&regs->ctrl2);
 		reg_ctrl2 |= FLEXCAN_CTRL2_ECRWRE;
-		flexcan_write(reg_ctrl2, &regs->ctrl2);
+		priv->write(reg_ctrl2, &regs->ctrl2);
 
-		reg_mecr = flexcan_read(&regs->mecr);
+		reg_mecr = priv->read(&regs->mecr);
 		reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS;
-		flexcan_write(reg_mecr, &regs->mecr);
+		priv->write(reg_mecr, &regs->mecr);
 		reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK |
 			      FLEXCAN_MECR_FANCEI_MSK);
-		flexcan_write(reg_mecr, &regs->mecr);
+		priv->write(reg_mecr, &regs->mecr);
 	}
 
 	err = flexcan_transceiver_enable(priv);
@@ -1035,14 +1046,14 @@ static int flexcan_chip_start(struct net_device *dev)
 
 	/* enable interrupts atomically */
 	disable_irq(dev->irq);
-	flexcan_write(priv->reg_ctrl_default, &regs->ctrl);
-	flexcan_write(priv->reg_imask1_default, &regs->imask1);
-	flexcan_write(priv->reg_imask2_default, &regs->imask2);
+	priv->write(priv->reg_ctrl_default, &regs->ctrl);
+	priv->write(priv->reg_imask1_default, &regs->imask1);
+	priv->write(priv->reg_imask2_default, &regs->imask2);
 	enable_irq(dev->irq);
 
 	/* print chip status */
 	netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__,
-		   flexcan_read(&regs->mcr), flexcan_read(&regs->ctrl));
+		   priv->read(&regs->mcr), priv->read(&regs->ctrl));
 
 	return 0;
 
@@ -1067,10 +1078,10 @@ static void flexcan_chip_stop(struct net_device *dev)
 	flexcan_chip_disable(priv);
 
 	/* Disable all interrupts */
-	flexcan_write(0, &regs->imask2);
-	flexcan_write(0, &regs->imask1);
-	flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
-		      &regs->ctrl);
+	priv->write(0, &regs->imask2);
+	priv->write(0, &regs->imask1);
+	priv->write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
+		    &regs->ctrl);
 
 	flexcan_transceiver_disable(priv);
 	priv->can.state = CAN_STATE_STOPPED;
@@ -1185,26 +1196,26 @@ static int register_flexcandev(struct net_device *dev)
 	err = flexcan_chip_disable(priv);
 	if (err)
 		goto out_disable_per;
-	reg = flexcan_read(&regs->ctrl);
+	reg = priv->read(&regs->ctrl);
 	reg |= FLEXCAN_CTRL_CLK_SRC;
-	flexcan_write(reg, &regs->ctrl);
+	priv->write(reg, &regs->ctrl);
 
 	err = flexcan_chip_enable(priv);
 	if (err)
 		goto out_chip_disable;
 
 	/* set freeze, halt and activate FIFO, restrict register access */
-	reg = flexcan_read(&regs->mcr);
+	reg = priv->read(&regs->mcr);
 	reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT |
 		FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV;
-	flexcan_write(reg, &regs->mcr);
+	priv->write(reg, &regs->mcr);
 
 	/* Currently we only support newer versions of this core
 	 * featuring a RX hardware FIFO (although this driver doesn't
 	 * make use of it on some cores). Older cores, found on some
 	 * Coldfire derivates are not tested.
 	 */
-	reg = flexcan_read(&regs->mcr);
+	reg = priv->read(&regs->mcr);
 	if (!(reg & FLEXCAN_MCR_FEN)) {
 		netdev_err(dev, "Could not enable RX FIFO, unsupported core\n");
 		err = -ENODEV;
@@ -1232,6 +1243,9 @@ static void unregister_flexcandev(struct net_device *dev)
 static const struct of_device_id flexcan_of_match[] = {
 	{ .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
 	{ .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
+	{ .compatible = "fsl,imx53-flexcan", .data = &fsl_p1010_devtype_data, },
+	{ .compatible = "fsl,imx35-flexcan", .data = &fsl_p1010_devtype_data, },
+	{ .compatible = "fsl,imx25-flexcan", .data = &fsl_p1010_devtype_data, },
 	{ .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
 	{ .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, },
 	{ /* sentinel */ },
@@ -1313,6 +1327,21 @@ static int flexcan_probe(struct platform_device *pdev)
 	dev->flags |= IFF_ECHO;
 
 	priv = netdev_priv(dev);
+
+	if (of_property_read_bool(pdev->dev.of_node, "big-endian")) {
+		priv->read = flexcan_read_be;
+		priv->write = flexcan_write_be;
+	} else {
+		if (of_device_is_compatible(pdev->dev.of_node,
+					    "fsl,p1010-flexcan")) {
+			priv->read = flexcan_read_be;
+			priv->write = flexcan_write_be;
+		} else {
+			priv->read = flexcan_read_le;
+			priv->write = flexcan_write_le;
+		}
+	}
+
 	priv->can.clock.freq = clock_freq;
 	priv->can.bittiming_const = &flexcan_bittiming_const;
 	priv->can.do_set_mode = flexcan_set_mode;
-- 
2.7.4

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Re: [PATCH v4 1/6] can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN controllers.

[Marc Kleine-Budde]

[-- Attachment #1.1: Type: text/plain, Size: 3511 bytes --]

On 11/24/2017 02:22 PM, Pankaj Bansal wrote:
> The FlexCAN driver assumed that FlexCAN controller is big endian for
> powerpc architecture and little endian for other architectures.
> 
> But this may not be the case. FlexCAN controller can be little or big
> endian on any architecture. For e.g. NXP LS1021A ARM based SOC has big
> endian FlexCAN controller.
> 
> Therefore, the driver has been modified to add a provision for both
> types of controllers using an additional device tree property. On a
> "fsl,p1010-flexcan" device BE is default, on all other devices LE is.
> 
> Big Endian controllers should have "big-endian" set in the device tree.
> check "Documentation/devicetree/bindings/net/can/fsl-flexcan.txt" for
> usage.
> 
> This is the standard practice followed in linux. for more info check:
> Documentation/devicetree/bindings/common-properties.txt
> 
> Signed-off-by: Pankaj Bansal <pankaj.bansal-3arQi8VN3Tc@public.gmane.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> Signed-off-by: Sakar Arora <Sakar.Arora-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> Reviewed-by: Zhengxiong Jin <Jason.Jin-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> Reviewed-by: Poonam Aggrwal <poonam.aggrwal-3arQi8VN3Tc@public.gmane.org>
> ---
> Changes in v4:
>   - Merged device tree changes and driver changes in one series
> Changes in v3:
>   - Added fsl,imx25-flexcan, fsl,imx35-flexcan and fsl,imx53-flexcan
>     support to the driver.
>   - Modified patch deciption to state default endianness followed and
>     to include fsl-flexcan.txt referance.
> Changes in v2:
>   - Modified patch deciption to include common-properties.txt reference.
>   - Reorder the LE/BE read/write APIs for better readability of code
>   - Added an exception to force BE API selection, for powerpc based platform
>     P1010. This ensures that new linux kernel works with old P1010
>     device-tree, while future powerpc platforms that use big endian
>     FlexCAN controller need to specify big-endian in device tree in
>     FlexCAN node.
>   - Tested on P1010 after backporting to freescale sdk 1.4 linux, without
>     any change in device-tree.
>   - Tested on NXP LS1021A arm based platform.
> 
>  drivers/net/can/flexcan.c | 233 ++++++++++++++++++++----------------
>  1 file changed, 131 insertions(+), 102 deletions(-)
> 
> diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
> index a13a489..4c873fb 100644
> --- a/drivers/net/can/flexcan.c
> +++ b/drivers/net/can/flexcan.c

[...]
I think this will select LE for non DT devices, right?

> +	if (of_property_read_bool(pdev->dev.of_node, "big-endian")) {
> +		priv->read = flexcan_read_be;
> +		priv->write = flexcan_write_be;
> +	} else {
> +		if (of_device_is_compatible(pdev->dev.of_node,
> +					    "fsl,p1010-flexcan")) {
> +			priv->read = flexcan_read_be;
> +			priv->write = flexcan_write_be;
> +		} else {
> +			priv->read = flexcan_read_le;
> +			priv->write = flexcan_write_le;
> +		}
> +	}
> +
>  	priv->can.clock.freq = clock_freq;
>  	priv->can.bittiming_const = &flexcan_bittiming_const;
>  	priv->can.do_set_mode = flexcan_set_mode;
> 

Marc

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


[-- Attachment #2: OpenPGP digital signature --]
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RE: [PATCH v4 1/6] can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN controllers.

[Pankaj Bansal]

> -----Original Message-----
> From: Marc Kleine-Budde [mailto:mkl@pengutronix.de]
> Sent: Friday, November 24, 2017 8:33 PM
> To: Pankaj Bansal <pankaj.bansal@nxp.com>; wg@grandegger.com; linux-
> can@vger.kernel.org; robh+dt@kernel.org; mark.rutland@arm.com;
> devicetree@vger.kernel.org
> Cc: Varun Sethi <V.Sethi@nxp.com>; Poonam Aggrwal
> <poonam.aggrwal@nxp.com>; Bhupesh Sharma
> <bhupesh.sharma@freescale.com>; Sakar Arora
> <Sakar.Arora@freescale.com>
> Subject: Re: [PATCH v4 1/6] can: flexcan: Remodel FlexCAN register r/w APIs
> for big endian FlexCAN controllers.
> 
> On 11/24/2017 02:22 PM, Pankaj Bansal wrote:
> > The FlexCAN driver assumed that FlexCAN controller is big endian for
> > powerpc architecture and little endian for other architectures.
> >
> > But this may not be the case. FlexCAN controller can be little or big
> > endian on any architecture. For e.g. NXP LS1021A ARM based SOC has big
> > endian FlexCAN controller.
> >
> > Therefore, the driver has been modified to add a provision for both
> > types of controllers using an additional device tree property. On a
> > "fsl,p1010-flexcan" device BE is default, on all other devices LE is.
> >
> > Big Endian controllers should have "big-endian" set in the device tree.
> > check "Documentation/devicetree/bindings/net/can/fsl-flexcan.txt" for
> > usage.
> >
> > This is the standard practice followed in linux. for more info check:
> > Documentation/devicetree/bindings/common-properties.txt
> >
> > Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
> > Signed-off-by: Sakar Arora <Sakar.Arora@freescale.com>
> > Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>
> > Reviewed-by: Poonam Aggrwal <poonam.aggrwal@nxp.com>
> > ---
> > Changes in v4:
> >   - Merged device tree changes and driver changes in one series
> > Changes in v3:
> >   - Added fsl,imx25-flexcan, fsl,imx35-flexcan and fsl,imx53-flexcan
> >     support to the driver.
> >   - Modified patch deciption to state default endianness followed and
> >     to include fsl-flexcan.txt referance.
> > Changes in v2:
> >   - Modified patch deciption to include common-properties.txt reference.
> >   - Reorder the LE/BE read/write APIs for better readability of code
> >   - Added an exception to force BE API selection, for powerpc based
> platform
> >     P1010. This ensures that new linux kernel works with old P1010
> >     device-tree, while future powerpc platforms that use big endian
> >     FlexCAN controller need to specify big-endian in device tree in
> >     FlexCAN node.
> >   - Tested on P1010 after backporting to freescale sdk 1.4 linux, without
> >     any change in device-tree.
> >   - Tested on NXP LS1021A arm based platform.
> >
> >  drivers/net/can/flexcan.c | 233 ++++++++++++++++++++----------------
> >  1 file changed, 131 insertions(+), 102 deletions(-)
> >
> > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
> > index a13a489..4c873fb 100644
> > --- a/drivers/net/can/flexcan.c
> > +++ b/drivers/net/can/flexcan.c
> 
> [...]
> I think this will select LE for non DT devices, right?
> 

Yes.  As per below code snippet:

static struct property *__of_find_property(const struct device_node *np,
					   const char *name, int *lenp)
{
	struct property *pp;

	if (!np)
		return NULL;
              ....
}

If no device node is present null is returned.
So we select le as default.

> > +	if (of_property_read_bool(pdev->dev.of_node, "big-endian")) {
> > +		priv->read = flexcan_read_be;
> > +		priv->write = flexcan_write_be;
> > +	} else {
> > +		if (of_device_is_compatible(pdev->dev.of_node,
> > +					    "fsl,p1010-flexcan")) {
> > +			priv->read = flexcan_read_be;
> > +			priv->write = flexcan_write_be;
> > +		} else {
> > +			priv->read = flexcan_read_le;
> > +			priv->write = flexcan_write_le;
> > +		}
> > +	}
> > +
> >  	priv->can.clock.freq = clock_freq;
> >  	priv->can.bittiming_const = &flexcan_bittiming_const;
> >  	priv->can.do_set_mode = flexcan_set_mode;
> >
> 
> Marc
> 
> --
> Pengutronix e.K.                  | Marc Kleine-Budde           |
> Industrial Linux Solutions        | Phone: +49-231-2826-924     |
> Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
> Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |

Re: [PATCH v4 1/6] can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN controllers.

[Marc Kleine-Budde]

[-- Attachment #1.1: Type: text/plain, Size: 1574 bytes --]

On 11/26/2017 03:20 AM, Pankaj Bansal wrote:
>>> diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
>>> index a13a489..4c873fb 100644
>>> --- a/drivers/net/can/flexcan.c
>>> +++ b/drivers/net/can/flexcan.c
>>
>> [...]
>> I think this will select LE for non DT devices, right?
>>
> 
> Yes.  As per below code snippet:
> 
> static struct property *__of_find_property(const struct device_node *np,
> 					   const char *name, int *lenp)
> {
> 	struct property *pp;
> 
> 	if (!np)
> 		return NULL;
>               ....
> }
> 
> If no device node is present null is returned.
> So we select le as default.

This is what I found out, too.

>>> +	if (of_property_read_bool(pdev->dev.of_node, "big-endian")) {
>>> +		priv->read = flexcan_read_be;
>>> +		priv->write = flexcan_write_be;
>>> +	} else {
>>> +		if (of_device_is_compatible(pdev->dev.of_node,
>>> +					    "fsl,p1010-flexcan")) {
>>> +			priv->read = flexcan_read_be;
>>> +			priv->write = flexcan_write_be;
>>> +		} else {
>>> +			priv->read = flexcan_read_le;
>>> +			priv->write = flexcan_write_le;
>>> +		}
>>> +	}
>>> +
>>>  	priv->can.clock.freq = clock_freq;
>>>  	priv->can.bittiming_const = &flexcan_bittiming_const;
>>>  	priv->can.do_set_mode = flexcan_set_mode;

Marc

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[PATCH v4 2/6] can: flexcan: adding platform specific details for LS1021A

[Pankaj Bansal]

This patch adds platform specific details for NXP SOC LS1021A to the
flexcan driver code.

Signed-off-by: Pankaj Bansal <pankaj.bansal-3arQi8VN3Tc@public.gmane.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reviewed-by: Zhengxiong Jin <Jason.Jin-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reviewed-by: Poonam Aggrwal <poonam.aggrwal-3arQi8VN3Tc@public.gmane.org>
---
Changes in v4:
  - Merged device tree changes and driver changes in one series
  - Remove obsolete comment about rev2 functional RX FIFO.
Changes in v3:
  - Add LS1021 in FLEXCAN hardware feature flags table
  - Kept LS1021 compatible in one line, even if it's more than 80
    chars.
  - Add PERR_STATE quirk and USE_OFF_TIMESTAMP quirk and
    ENABLE_EACEN_RRS quirk for LS1021A.
  - Tested on LS1021A using "cangen can0 -D 11223344DEADBEEF -L 8 -R"
    and "cangen can0 -D 11223344DEADBEEF -L 8"
Changes in v2:
  - No change.

 drivers/net/can/flexcan.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 4c873fb..3a370d8 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -190,6 +190,7 @@
  *   MX53  FlexCAN2  03.00.00.00    yes        no        no       no        no
  *   MX6s  FlexCAN3  10.00.12.00    yes       yes        no       no       yes
  *   VF610 FlexCAN3  ?               no       yes         ?      yes       yes?
+ * LS1021A FlexCAN2  03.00.04.00     no       yes        no       no       yes
  *
  * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected.
  */
@@ -304,6 +305,12 @@ static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
 		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP,
 };
 
+static const struct flexcan_devtype_data fsl_ls1021a_r2_devtype_data = {
+	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
+		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_BROKEN_PERR_STATE |
+		FLEXCAN_QUIRK_USE_OFF_TIMESTAMP,
+};
+
 static const struct can_bittiming_const flexcan_bittiming_const = {
 	.name = DRV_NAME,
 	.tseg1_min = 4,
@@ -1248,6 +1255,7 @@ static const struct of_device_id flexcan_of_match[] = {
 	{ .compatible = "fsl,imx25-flexcan", .data = &fsl_p1010_devtype_data, },
 	{ .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
 	{ .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, },
+	{ .compatible = "fsl,ls1021ar2-flexcan", .data = &fsl_ls1021a_r2_devtype_data, },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, flexcan_of_match);
-- 
2.7.4

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[PATCH v4 3/6] Documentation : can : flexcan : Add big-endian property to device tree

[Pankaj Bansal]

The FlexCAN controller can be modelled as little or big endian depending
on SOC design. This device tree property identifies the controller
endianness and the driver reads/writes controller registers based on
that.

This is optional property. i.e. if this property is not present in
device tree node then controller is assumed to be little endian. if this
property is present then controller is assumed to be big endian.

Signed-off-by: Pankaj Bansal <pankaj.bansal-3arQi8VN3Tc@public.gmane.org>
Reviewed-by: Poonam Aggrwal <poonam.aggrwal-3arQi8VN3Tc@public.gmane.org>
---
Changes in v4:
  - document the default behaviour in the bindings if the big-endian property
    is missing.
  - Merged device tree changes and driver changes in one series
Changes in v3:
  - No change.
Changes in v2:
  - No change.
  - Added one more patch in series.

 Documentation/devicetree/bindings/net/can/fsl-flexcan.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
index 56d6cc3..bfc0c43 100644
--- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
+++ b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
@@ -18,6 +18,12 @@ Optional properties:
 
 - xceiver-supply: Regulator that powers the CAN transceiver
 
+- big-endian: This means the registers of FlexCAN controller are big endian.
+              This is optional property.i.e. if this property is not present in
+              device tree node then controller is assumed to be little endian.
+              if this property is present then controller is assumed to be big
+              endian.
+
 Example:
 
 	can@1c000 {
-- 
2.7.4

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Re: [PATCH v4 3/6] Documentation : can : flexcan : Add big-endian property to device tree

[Rob Herring]

On Fri, Nov 24, 2017 at 06:52:10PM +0530, Pankaj Bansal wrote:
> The FlexCAN controller can be modelled as little or big endian depending
> on SOC design. This device tree property identifies the controller
> endianness and the driver reads/writes controller registers based on
> that.
> 
> This is optional property. i.e. if this property is not present in
> device tree node then controller is assumed to be little endian. if this
> property is present then controller is assumed to be big endian.
> 
> Signed-off-by: Pankaj Bansal <pankaj.bansal-3arQi8VN3Tc@public.gmane.org>
> Reviewed-by: Poonam Aggrwal <poonam.aggrwal-3arQi8VN3Tc@public.gmane.org>
> ---
> Changes in v4:
>   - document the default behaviour in the bindings if the big-endian property
>     is missing.
>   - Merged device tree changes and driver changes in one series
> Changes in v3:
>   - No change.
> Changes in v2:
>   - No change.
>   - Added one more patch in series.
> 
>  Documentation/devicetree/bindings/net/can/fsl-flexcan.txt | 6 ++++++
>  1 file changed, 6 insertions(+)

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

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[PATCH v4 6/6] arm/dts: Add nodes for flexcan devices present on LS1021A-Rev2 SoC

[Pankaj Bansal]

This patch adds the device nodes for flexcan controller(s) present on
LS1021A-Rev2 SoC.

Signed-off-by: Pankaj Bansal <pankaj.bansal-3arQi8VN3Tc@public.gmane.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Signed-off-by: Sakar Arora <Sakar.Arora-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reviewed-by: Zhengxiong Jin <Jason.Jin-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reviewed-by: Poonam Aggrwal <poonam.aggrwal-3arQi8VN3Tc@public.gmane.org>
---
Changes in v4:
  - Merged device tree changes and driver changes in one series
Changes in v3:
  - No change.
Changes in v2:
  - No change.
  - Added one more patch in series.

 arch/arm/boot/dts/ls1021a-qds.dts | 16 +++++++++++++
 arch/arm/boot/dts/ls1021a-twr.dts | 16 +++++++++++++
 arch/arm/boot/dts/ls1021a.dtsi    | 36 +++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)

diff --git a/arch/arm/boot/dts/ls1021a-qds.dts b/arch/arm/boot/dts/ls1021a-qds.dts
index 9408753..4f211e3 100644
--- a/arch/arm/boot/dts/ls1021a-qds.dts
+++ b/arch/arm/boot/dts/ls1021a-qds.dts
@@ -331,3 +331,19 @@
 &uart1 {
 	status = "okay";
 };
+
+&can0 {
+	status = "okay";
+};
+
+&can1 {
+	status = "okay";
+};
+
+&can2 {
+	status = "disabled";
+};
+
+&can3 {
+	status = "disabled";
+};
diff --git a/arch/arm/boot/dts/ls1021a-twr.dts b/arch/arm/boot/dts/ls1021a-twr.dts
index a8b148a..7202d9c 100644
--- a/arch/arm/boot/dts/ls1021a-twr.dts
+++ b/arch/arm/boot/dts/ls1021a-twr.dts
@@ -243,3 +243,19 @@
 &uart1 {
 	status = "okay";
 };
+
+&can0 {
+	status = "okay";
+};
+
+&can1 {
+	status = "okay";
+};
+
+&can2 {
+	status = "disabled";
+};
+
+&can3 {
+	status = "disabled";
+};
diff --git a/arch/arm/boot/dts/ls1021a.dtsi b/arch/arm/boot/dts/ls1021a.dtsi
index 9319e1f..7789031 100644
--- a/arch/arm/boot/dts/ls1021a.dtsi
+++ b/arch/arm/boot/dts/ls1021a.dtsi
@@ -730,5 +730,41 @@
 					<0000 0 0 3 &gic GIC_SPI 191 IRQ_TYPE_LEVEL_HIGH>,
 					<0000 0 0 4 &gic GIC_SPI 193 IRQ_TYPE_LEVEL_HIGH>;
 		};
+
+		can0: can@2a70000 {
+			compatible = "fsl,ls1021ar2-flexcan";
+			reg = <0x0 0x2a70000 0x0 0x1000>;
+			interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clockgen 4 1>, <&clockgen 4 1>;
+			clock-names = "ipg", "per";
+			big-endian;
+		};
+
+		can1: can@2a80000 {
+			compatible = "fsl,ls1021ar2-flexcan";
+			reg = <0x0 0x2a80000 0x0 0x1000>;
+			interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clockgen 4 1>, <&clockgen 4 1>;
+			clock-names = "ipg", "per";
+			big-endian;
+		};
+
+		can2: can@2a90000 {
+			compatible = "fsl,ls1021ar2-flexcan";
+			reg = <0x0 0x2a90000 0x0 0x1000>;
+			interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clockgen 4 1>, <&clockgen 4 1>;
+			clock-names = "ipg", "per";
+			big-endian;
+		};
+
+		can3: can@2aa0000 {
+			compatible = "fsl,ls1021ar2-flexcan";
+			reg = <0x0 0x2aa0000 0x0 0x1000>;
+			interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clockgen 4 1>, <&clockgen 4 1>;
+			clock-names = "ipg", "per";
+			big-endian;
+		};
 	};
 };
-- 
2.7.4

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Re: [PATCH v4 0/6] Remodel FlexCAN register r/w APIs for big endian

[Marc Kleine-Budde]

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On 11/24/2017 02:22 PM, Pankaj Bansal wrote:
> This patch series remodels the FlexCAN register r/w APIs for big endian.
> The endianness is checked based on optional big-endian property in
> device tree. if this property is not present in device tree node then 
> controller is assumed to be little endian. if this property is present then
> controller is assumed to be big endian.
> 
> An exception to this rule is powerpc P1010RDB, which is always
> big-endian, even if big-endian is not present in dts. This is
> checked using p1010-flexcan compatible in dts.
> 
> Therefore, remove p1010-flexcan compatible from imx series dts,
> as their flexcan core is little endian.
> 
> Finally this series adds support for NXP LS1021A SOC in flexcan,
> which is arm based SOC having big-endian FlexCAN controller.
> 
> Pankaj Bansal (6):
>   can: flexcan: Remodel FlexCAN register r/w APIs for big endian FlexCAN
>     controllers.
>   can: flexcan: adding platform specific details for LS1021A
>   Documentation : can : flexcan : Add big-endian property to device tree
>   powerpc: dts: P1010: Add endianness property to flexcan node
>   arm: dts: Remove p1010-flexcan compatible from imx series dts
>   arm/dts: Add nodes for flexcan devices present on LS1021A-Rev2 SoC

Applied to can-next.

Thanks,
Marc

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Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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