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Message-ID: <20250503-fulmar-of-sexy-upgrade-1184a7-mkl@pengutronix.de>
Date: Sat, 3 May 2025 15:57:04 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: a0282524688@...il.com
Cc: lee@...nel.org, linus.walleij@...aro.org, brgl@...ev.pl,
andi.shyti@...nel.org, mailhol.vincent@...adoo.fr, andrew+netdev@...n.ch,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
wim@...ux-watchdog.org, linux@...ck-us.net, jdelvare@...e.com,
alexandre.belloni@...tlin.com, linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-i2c@...r.kernel.org, linux-can@...r.kernel.org, netdev@...r.kernel.org,
linux-watchdog@...r.kernel.org, linux-hwmon@...r.kernel.org, linux-rtc@...r.kernel.org,
linux-usb@...r.kernel.org, Ming Yu <tmyu0@...oton.com>
Subject: Re: [PATCH v10 4/7] can: Add Nuvoton NCT6694 CANFD support
On 23.04.2025 17:40:55, a0282524688@...il.com wrote:
> From: Ming Yu <tmyu0@...oton.com>
>
> This driver supports Socket CANFD functionality for NCT6694 MFD
> device based on USB interface.
>
> Signed-off-by: Ming Yu <tmyu0@...oton.com>
The destroy functions nct6694_canfd_close() and nct6694_canfd_remove()
are not the exact inverse of their init functions. Se comments inline.
Please fix and add:
Reviewed-by: Marc Kleine-Budde <mkl@...gutronix.de>
Feel free to mainline this patch as part of the series outside of the
linux-can-next tree. Better ask the netdev maintainers for their OK, too.
What about transceiver delay compensation for higher CAN-FD bitrates?
How does you device handle these?
> ---
> MAINTAINERS | 1 +
> drivers/net/can/usb/Kconfig | 11 +
> drivers/net/can/usb/Makefile | 1 +
> drivers/net/can/usb/nct6694_canfd.c | 814 ++++++++++++++++++++++++++++
> 4 files changed, 827 insertions(+)
> create mode 100644 drivers/net/can/usb/nct6694_canfd.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 751b9108524a..ee8583edc2d2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -17364,6 +17364,7 @@ S: Supported
> F: drivers/gpio/gpio-nct6694.c
> F: drivers/i2c/busses/i2c-nct6694.c
> F: drivers/mfd/nct6694.c
> +F: drivers/net/can/usb/nct6694_canfd.c
> F: include/linux/mfd/nct6694.h
>
> NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER
> diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig
> index 9dae0c71a2e1..759e724a67cf 100644
> --- a/drivers/net/can/usb/Kconfig
> +++ b/drivers/net/can/usb/Kconfig
> @@ -133,6 +133,17 @@ config CAN_MCBA_USB
> This driver supports the CAN BUS Analyzer interface
> from Microchip (http://www.microchip.com/development-tools/).
>
> +config CAN_NCT6694
> + tristate "Nuvoton NCT6694 Socket CANfd support"
> + depends on MFD_NCT6694
> + select CAN_RX_OFFLOAD
> + help
> + If you say yes to this option, support will be included for Nuvoton
> + NCT6694, a USB device to socket CANfd controller.
> +
> + This driver can also be built as a module. If so, the module will
> + be called nct6694_canfd.
> +
> config CAN_PEAK_USB
> tristate "PEAK PCAN-USB/USB Pro interfaces for CAN 2.0b/CAN-FD"
> help
> diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile
> index 8b11088e9a59..fcafb1ac262e 100644
> --- a/drivers/net/can/usb/Makefile
> +++ b/drivers/net/can/usb/Makefile
> @@ -11,5 +11,6 @@ obj-$(CONFIG_CAN_F81604) += f81604.o
> obj-$(CONFIG_CAN_GS_USB) += gs_usb.o
> obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb/
> obj-$(CONFIG_CAN_MCBA_USB) += mcba_usb.o
> +obj-$(CONFIG_CAN_NCT6694) += nct6694_canfd.o
> obj-$(CONFIG_CAN_PEAK_USB) += peak_usb/
> obj-$(CONFIG_CAN_UCAN) += ucan.o
> diff --git a/drivers/net/can/usb/nct6694_canfd.c b/drivers/net/can/usb/nct6694_canfd.c
> new file mode 100644
> index 000000000000..9cf6230ffb7d
> --- /dev/null
> +++ b/drivers/net/can/usb/nct6694_canfd.c
> @@ -0,0 +1,814 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Nuvoton NCT6694 Socket CANfd driver based on USB interface.
> + *
> + * Copyright (C) 2024 Nuvoton Technology Corp.
> + */
> +
> +#include <linux/can/dev.h>
> +#include <linux/can/rx-offload.h>
> +#include <linux/ethtool.h>
> +#include <linux/irqdomain.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/nct6694.h>
> +#include <linux/module.h>
> +#include <linux/netdevice.h>
> +#include <linux/platform_device.h>
> +
> +#define DEVICE_NAME "nct6694-canfd"
> +
> +/* USB command module type for NCT6694 CANfd controller.
> + * This defines the module type used for communication with the NCT6694
> + * CANfd controller over the USB interface.
> + */
> +#define NCT6694_CANFD_MOD 0x05
> +
> +/* Command 00h - CAN Setting and Initialization */
> +#define NCT6694_CANFD_SETTING 0x00
> +#define NCT6694_CANFD_SETTING_ACTIVE_CTRL1 BIT(0)
> +#define NCT6694_CANFD_SETTING_ACTIVE_CTRL2 BIT(1)
> +#define NCT6694_CANFD_SETTING_ACTIVE_NBTP_DBTP BIT(2)
> +#define NCT6694_CANFD_SETTING_CTRL1_MON BIT(0)
> +#define NCT6694_CANFD_SETTING_CTRL1_NISO BIT(1)
> +#define NCT6694_CANFD_SETTING_CTRL1_LBCK BIT(2)
> +#define NCT6694_CANFD_SETTING_NBTP_NTSEG2 GENMASK(6, 0)
> +#define NCT6694_CANFD_SETTING_NBTP_NTSEG1 GENMASK(15, 8)
> +#define NCT6694_CANFD_SETTING_NBTP_NBRP GENMASK(24, 16)
> +#define NCT6694_CANFD_SETTING_NBTP_NSJW GENMASK(31, 25)
> +#define NCT6694_CANFD_SETTING_DBTP_DSJW GENMASK(3, 0)
> +#define NCT6694_CANFD_SETTING_DBTP_DTSEG2 GENMASK(7, 4)
> +#define NCT6694_CANFD_SETTING_DBTP_DTSEG1 GENMASK(12, 8)
> +#define NCT6694_CANFD_SETTING_DBTP_DBRP GENMASK(20, 16)
> +
> +/* Command 01h - CAN Information */
> +#define NCT6694_CANFD_INFORMATION 0x01
> +#define NCT6694_CANFD_INFORMATION_SEL 0x00
> +
> +/* Command 02h - CAN Event */
> +#define NCT6694_CANFD_EVENT 0x02
> +#define NCT6694_CANFD_EVENT_SEL(idx, mask) \
> + ((idx ? 0x80 : 0x00) | ((mask) & 0x7F))
> +
> +#define NCT6694_CANFD_EVENT_MASK GENMASK(5, 0)
> +#define NCT6694_CANFD_EVT_TX_FIFO_EMPTY BIT(7) /* Read-clear */
> +#define NCT6694_CANFD_EVT_RX_DATA_LOST BIT(5) /* Read-clear */
> +#define NCT6694_CANFD_EVT_RX_DATA_IN BIT(7) /* Read-clear*/
^^
add a space
> +
> +/* Command 10h - CAN Deliver */
> +#define NCT6694_CANFD_DELIVER 0x10
> +#define NCT6694_CANFD_DELIVER_SEL(buf_cnt) \
> + ((buf_cnt) & 0xFF)
> +
> +/* Command 11h - CAN Receive */
> +#define NCT6694_CANFD_RECEIVE 0x11
> +#define NCT6694_CANFD_RECEIVE_SEL(idx, buf_cnt) \
> + ((idx ? 0x80 : 0x00) | ((buf_cnt) & 0x7F))
> +
> +#define NCT6694_CANFD_FRAME_TAG(idx) (0xC0 | (idx))
> +#define NCT6694_CANFD_FRAME_FLAG_EFF BIT(0)
> +#define NCT6694_CANFD_FRAME_FLAG_RTR BIT(1)
> +#define NCT6694_CANFD_FRAME_FLAG_FD BIT(2)
> +#define NCT6694_CANFD_FRAME_FLAG_BRS BIT(3)
> +#define NCT6694_CANFD_FRAME_FLAG_ERR BIT(4)
> +
> +#define NCT6694_NAPI_WEIGHT 32
> +
> +enum nct6694_event_err {
> + NCT6694_CANFD_EVT_ERR_NO_ERROR = 0,
> + NCT6694_CANFD_EVT_ERR_CRC_ERROR,
> + NCT6694_CANFD_EVT_ERR_STUFF_ERROR,
> + NCT6694_CANFD_EVT_ERR_ACK_ERROR,
> + NCT6694_CANFD_EVT_ERR_FORM_ERROR,
> + NCT6694_CANFD_EVT_ERR_BIT_ERROR,
> + NCT6694_CANFD_EVT_ERR_TIMEOUT_ERROR,
> + NCT6694_CANFD_EVT_ERR_UNKNOWN_ERROR,
> +};
> +
> +enum nct6694_event_status {
> + NCT6694_CANFD_EVT_STS_ERROR_ACTIVE = 0,
> + NCT6694_CANFD_EVT_STS_ERROR_PASSIVE,
> + NCT6694_CANFD_EVT_STS_BUS_OFF,
> + NCT6694_CANFD_EVT_STS_WARNING,
> +};
> +
> +struct __packed nct6694_canfd_setting {
> + __le32 nbr;
> + __le32 dbr;
> + u8 active;
> + u8 reserved[3];
> + __le16 ctrl1;
> + __le16 ctrl2;
> + __le32 nbtp;
> + __le32 dbtp;
> +};
> +
> +struct __packed nct6694_canfd_information {
> + u8 tx_fifo_cnt;
> + u8 rx_fifo_cnt;
> + u8 reserved[2];
> + __le32 can_clk;
> +};
> +
> +struct __packed nct6694_canfd_event {
> + u8 err;
> + u8 status;
> + u8 tx_evt;
> + u8 rx_evt;
> + u8 rec;
> + u8 tec;
> + u8 reserved[2];
> +};
> +
> +struct __packed nct6694_canfd_frame {
> + u8 tag;
> + u8 flag;
> + u8 reserved;
> + u8 length;
> + __le32 id;
> + u8 data[CANFD_MAX_DLEN];
> +};
> +
> +struct nct6694_canfd_priv {
> + struct can_priv can; /* must be the first member */
> + struct can_rx_offload offload;
> + struct net_device *ndev;
> + struct nct6694 *nct6694;
> + struct workqueue_struct *wq;
> + struct work_struct tx_work;
> + struct nct6694_canfd_frame tx;
> + struct nct6694_canfd_frame rx;
> + struct nct6694_canfd_event event[2];
> + struct can_berr_counter bec;
> +};
> +
> +static inline struct nct6694_canfd_priv *rx_offload_to_priv(struct can_rx_offload *offload)
> +{
> + return container_of(offload, struct nct6694_canfd_priv, offload);
> +}
> +
> +static const struct can_bittiming_const nct6694_canfd_bittiming_nominal_const = {
> + .name = DEVICE_NAME,
> + .tseg1_min = 1,
> + .tseg1_max = 256,
> + .tseg2_min = 1,
> + .tseg2_max = 128,
> + .sjw_max = 128,
> + .brp_min = 1,
> + .brp_max = 512,
> + .brp_inc = 1,
> +};
> +
> +static const struct can_bittiming_const nct6694_canfd_bittiming_data_const = {
> + .name = DEVICE_NAME,
> + .tseg1_min = 1,
> + .tseg1_max = 32,
> + .tseg2_min = 1,
> + .tseg2_max = 16,
> + .sjw_max = 16,
> + .brp_min = 1,
> + .brp_max = 32,
> + .brp_inc = 1,
> +};
> +
> +static void nct6694_canfd_rx_offload(struct can_rx_offload *offload,
> + struct sk_buff *skb)
> +{
> + struct nct6694_canfd_priv *priv = rx_offload_to_priv(offload);
> + int ret;
> +
> + ret = can_rx_offload_queue_tail(offload, skb);
> + if (ret)
> + priv->ndev->stats.rx_fifo_errors++;
> +}
> +
> +static void nct6694_canfd_handle_lost_msg(struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + struct net_device_stats *stats = &ndev->stats;
> + struct can_frame *cf;
> + struct sk_buff *skb;
> +
> + netdev_dbg(ndev, "RX FIFO overflow, message(s) lost.\n");
> +
> + stats->rx_errors++;
> + stats->rx_over_errors++;
> +
> + skb = alloc_can_err_skb(ndev, &cf);
> + if (!skb)
> + return;
> +
> + cf->can_id |= CAN_ERR_CRTL;
> + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
> +
> + nct6694_canfd_rx_offload(&priv->offload, skb);
> +}
> +
> +static void nct6694_canfd_handle_rx(struct net_device *ndev, u8 rx_evt)
> +{
> + struct net_device_stats *stats = &ndev->stats;
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + struct nct6694_canfd_frame *frame = &priv->rx;
> + const struct nct6694_cmd_header cmd_hd = {
> + .mod = NCT6694_CANFD_MOD,
> + .cmd = NCT6694_CANFD_RECEIVE,
> + .sel = NCT6694_CANFD_RECEIVE_SEL(ndev->dev_port, 1),
> + .len = cpu_to_le16(sizeof(*frame))
> + };
> + struct sk_buff *skb;
> + int ret;
> +
> + ret = nct6694_read_msg(priv->nct6694, &cmd_hd, frame);
> + if (ret)
> + return;
> +
> + if (frame->flag & NCT6694_CANFD_FRAME_FLAG_FD) {
> + struct canfd_frame *cfd;
> +
> + skb = alloc_canfd_skb(priv->ndev, &cfd);
> + if (!skb) {
> + stats->rx_dropped++;
> + return;
> + }
> +
> + cfd->can_id = le32_to_cpu(frame->id);
> + cfd->len = canfd_sanitize_len(frame->length);
> + if (frame->flag & NCT6694_CANFD_FRAME_FLAG_EFF)
> + cfd->can_id |= CAN_EFF_FLAG;
> + if (frame->flag & NCT6694_CANFD_FRAME_FLAG_BRS)
> + cfd->flags |= CANFD_BRS;
> + if (frame->flag & NCT6694_CANFD_FRAME_FLAG_ERR)
> + cfd->flags |= CANFD_ESI;
> +
> + memcpy(cfd->data, frame->data, cfd->len);
> + } else {
> + struct can_frame *cf;
> +
> + skb = alloc_can_skb(priv->ndev, &cf);
> + if (!skb) {
> + stats->rx_dropped++;
> + return;
> + }
> +
> + cf->can_id = le32_to_cpu(frame->id);
> + cf->len = can_cc_dlc2len(frame->length);
> + if (frame->flag & NCT6694_CANFD_FRAME_FLAG_EFF)
> + cf->can_id |= CAN_EFF_FLAG;
> +
> + if (frame->flag & NCT6694_CANFD_FRAME_FLAG_RTR)
> + cf->can_id |= CAN_RTR_FLAG;
> + else
> + memcpy(cf->data, frame->data, cf->len);
> + }
> +
> + nct6694_canfd_rx_offload(&priv->offload, skb);
> +}
> +
> +static int nct6694_canfd_get_berr_counter(const struct net_device *ndev,
> + struct can_berr_counter *bec)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> +
> + *bec = priv->bec;
> +
> + return 0;
> +}
> +
> +static void nct6694_canfd_handle_state_change(struct net_device *ndev, u8 status)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + enum can_state new_state, rx_state, tx_state;
> + struct can_berr_counter bec;
> + struct can_frame *cf;
> + struct sk_buff *skb;
> +
> + nct6694_canfd_get_berr_counter(ndev, &bec);
> + can_state_get_by_berr_counter(ndev, &bec, &tx_state, &rx_state);
> +
> + new_state = max(tx_state, rx_state);
> +
> + /* state hasn't changed */
> + if (new_state == priv->can.state)
> + return;
> +
> + skb = alloc_can_err_skb(ndev, &cf);
> +
> + can_change_state(ndev, cf, tx_state, rx_state);
> +
> + if (new_state == CAN_STATE_BUS_OFF) {
> + can_bus_off(ndev);
> + } else if (cf) {
> + cf->can_id |= CAN_ERR_CNT;
> + cf->data[6] = bec.txerr;
> + cf->data[7] = bec.rxerr;
> + }
> +
> + if (skb)
> + nct6694_canfd_rx_offload(&priv->offload, skb);
> +}
> +
> +static void nct6694_canfd_handle_bus_err(struct net_device *ndev, u8 bus_err)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + struct can_frame *cf;
> + struct sk_buff *skb;
> +
> + priv->can.can_stats.bus_error++;
> +
> + skb = alloc_can_err_skb(ndev, &cf);
> + if (cf)
> + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
> +
> + switch (bus_err) {
> + case NCT6694_CANFD_EVT_ERR_CRC_ERROR:
> + netdev_dbg(ndev, "CRC error\n");
> + ndev->stats.rx_errors++;
> + if (cf)
> + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
> + break;
> +
> + case NCT6694_CANFD_EVT_ERR_STUFF_ERROR:
> + netdev_dbg(ndev, "Stuff error\n");
> + ndev->stats.rx_errors++;
> + if (cf)
> + cf->data[2] |= CAN_ERR_PROT_STUFF;
> + break;
> +
> + case NCT6694_CANFD_EVT_ERR_ACK_ERROR:
> + netdev_dbg(ndev, "Ack error\n");
> + ndev->stats.tx_errors++;
> + if (cf) {
> + cf->can_id |= CAN_ERR_ACK;
> + cf->data[2] |= CAN_ERR_PROT_TX;
> + }
> + break;
> +
> + case NCT6694_CANFD_EVT_ERR_FORM_ERROR:
> + netdev_dbg(ndev, "Form error\n");
> + ndev->stats.rx_errors++;
> + if (cf)
> + cf->data[2] |= CAN_ERR_PROT_FORM;
> + break;
> +
> + case NCT6694_CANFD_EVT_ERR_BIT_ERROR:
> + netdev_dbg(ndev, "Bit error\n");
> + ndev->stats.tx_errors++;
> + if (cf)
> + cf->data[2] |= CAN_ERR_PROT_TX | CAN_ERR_PROT_BIT;
> + break;
> +
> + default:
> + break;
> + }
> +
> + if (skb)
> + nct6694_canfd_rx_offload(&priv->offload, skb);
> +}
> +
> +static void nct6694_canfd_handle_tx(struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + struct net_device_stats *stats = &ndev->stats;
> +
> + stats->tx_bytes += can_rx_offload_get_echo_skb_queue_tail(&priv->offload,
> + 0, NULL);
> + stats->tx_packets++;
> + netif_wake_queue(ndev);
> +}
> +
> +static irqreturn_t nct6694_canfd_irq(int irq, void *data)
> +{
> + struct net_device *ndev = data;
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + struct nct6694_canfd_event *event = &priv->event[ndev->dev_port];
> + const struct nct6694_cmd_header cmd_hd = {
> + .mod = NCT6694_CANFD_MOD,
> + .cmd = NCT6694_CANFD_EVENT,
> + .sel = NCT6694_CANFD_EVENT_SEL(ndev->dev_port, NCT6694_CANFD_EVENT_MASK),
> + .len = cpu_to_le16(sizeof(priv->event))
> + };
> + irqreturn_t handled = IRQ_NONE;
> + int ret;
> +
> + ret = nct6694_read_msg(priv->nct6694, &cmd_hd, priv->event);
> + if (ret < 0)
> + return handled;
> +
> + if (event->rx_evt & NCT6694_CANFD_EVT_RX_DATA_IN) {
> + nct6694_canfd_handle_rx(ndev, event->rx_evt);
> + handled = IRQ_HANDLED;
> + }
> +
> + if (event->rx_evt & NCT6694_CANFD_EVT_RX_DATA_LOST) {
> + nct6694_canfd_handle_lost_msg(ndev);
> + handled = IRQ_HANDLED;
> + }
> +
> + if (event->status) {
> + nct6694_canfd_handle_state_change(ndev, event->status);
> + handled = IRQ_HANDLED;
> + }
> +
> + if (event->err != NCT6694_CANFD_EVT_ERR_NO_ERROR) {
> + if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
> + nct6694_canfd_handle_bus_err(ndev, event->err);
> + handled = IRQ_HANDLED;
> + }
> +
> + if (event->tx_evt & NCT6694_CANFD_EVT_TX_FIFO_EMPTY) {
> + nct6694_canfd_handle_tx(ndev);
> + handled = IRQ_HANDLED;
> + }
> +
> + if (handled)
> + can_rx_offload_threaded_irq_finish(&priv->offload);
> +
> + priv->bec.rxerr = event->rec;
> + priv->bec.txerr = event->tec;
> +
> + return handled;
> +}
> +
> +static void nct6694_canfd_tx_work(struct work_struct *work)
> +{
> + struct nct6694_canfd_priv *priv = container_of(work,
> + struct nct6694_canfd_priv,
> + tx_work);
> + struct nct6694_canfd_frame *frame = &priv->tx;
> + struct net_device *ndev = priv->ndev;
> + struct net_device_stats *stats = &ndev->stats;
> + struct sk_buff *skb = priv->can.echo_skb[0];
> + static const struct nct6694_cmd_header cmd_hd = {
> + .mod = NCT6694_CANFD_MOD,
> + .cmd = NCT6694_CANFD_DELIVER,
> + .sel = NCT6694_CANFD_DELIVER_SEL(1),
> + .len = cpu_to_le16(sizeof(*frame))
> + };
> + u32 txid;
> + int err;
> +
> + memset(frame, 0, sizeof(*frame));
> +
> + frame->tag = NCT6694_CANFD_FRAME_TAG(ndev->dev_port);
> +
> + if (can_is_canfd_skb(skb)) {
> + struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
> +
> + if (cfd->flags & CANFD_BRS)
> + frame->flag |= NCT6694_CANFD_FRAME_FLAG_BRS;
> +
> + if (cfd->can_id & CAN_EFF_FLAG) {
> + txid = cfd->can_id & CAN_EFF_MASK;
> + frame->flag |= NCT6694_CANFD_FRAME_FLAG_EFF;
> + } else {
> + txid = cfd->can_id & CAN_SFF_MASK;
> + }
> + frame->flag |= NCT6694_CANFD_FRAME_FLAG_FD;
> + frame->id = cpu_to_le32(txid);
> + frame->length = canfd_sanitize_len(cfd->len);
> +
> + memcpy(frame->data, cfd->data, frame->length);
> + } else {
> + struct can_frame *cf = (struct can_frame *)skb->data;
> +
> + if (cf->can_id & CAN_EFF_FLAG) {
> + txid = cf->can_id & CAN_EFF_MASK;
> + frame->flag |= NCT6694_CANFD_FRAME_FLAG_EFF;
> + } else {
> + txid = cf->can_id & CAN_SFF_MASK;
> + }
> +
> + if (cf->can_id & CAN_RTR_FLAG)
> + frame->flag |= NCT6694_CANFD_FRAME_FLAG_RTR;
> + else
> + memcpy(frame->data, cf->data, cf->len);
> +
> + frame->id = cpu_to_le32(txid);
> + frame->length = cf->len;
> + }
> +
> + err = nct6694_write_msg(priv->nct6694, &cmd_hd, frame);
> + if (err) {
> + can_free_echo_skb(ndev, 0, NULL);
> + stats->tx_dropped++;
> + stats->tx_errors++;
> + netif_wake_queue(ndev);
> + }
> +}
> +
> +static netdev_tx_t nct6694_canfd_start_xmit(struct sk_buff *skb,
> + struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> +
> + if (can_dev_dropped_skb(ndev, skb))
> + return NETDEV_TX_OK;
> +
> + netif_stop_queue(ndev);
> + can_put_echo_skb(skb, ndev, 0, 0);
> + queue_work(priv->wq, &priv->tx_work);
> +
> + return NETDEV_TX_OK;
> +}
> +
> +static int nct6694_canfd_start(struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + const struct can_bittiming *d_bt = &priv->can.data_bittiming;
> + const struct can_bittiming *n_bt = &priv->can.bittiming;
> + struct nct6694_canfd_setting *setting __free(kfree) = NULL;
> + const struct nct6694_cmd_header cmd_hd = {
> + .mod = NCT6694_CANFD_MOD,
> + .cmd = NCT6694_CANFD_SETTING,
> + .sel = ndev->dev_port,
> + .len = cpu_to_le16(sizeof(*setting))
> + };
> + int ret;
> +
> + setting = kzalloc(sizeof(*setting), GFP_KERNEL);
> + if (!setting)
> + return -ENOMEM;
> +
> + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
> + setting->ctrl1 |= cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_MON);
> +
> + if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
> + setting->ctrl1 |= cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_NISO);
> +
> + if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
> + setting->ctrl1 |= cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_LBCK);
> +
> + /* Disable clock divider */
> + setting->ctrl2 = 0;
> +
> + setting->nbtp = cpu_to_le32(FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NSJW,
> + n_bt->sjw - 1) |
> + FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NBRP,
> + n_bt->brp - 1) |
> + FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NTSEG2,
> + n_bt->phase_seg2 - 1) |
> + FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NTSEG1,
> + n_bt->prop_seg + n_bt->phase_seg1 - 1));
> +
> + setting->dbtp = cpu_to_le32(FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DSJW,
> + d_bt->sjw - 1) |
> + FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DBRP,
> + d_bt->brp - 1) |
> + FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DTSEG2,
> + d_bt->phase_seg2 - 1) |
> + FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DTSEG1,
> + d_bt->prop_seg + d_bt->phase_seg1 - 1));
> +
> + setting->active = NCT6694_CANFD_SETTING_ACTIVE_CTRL1 |
> + NCT6694_CANFD_SETTING_ACTIVE_CTRL2 |
> + NCT6694_CANFD_SETTING_ACTIVE_NBTP_DBTP;
> +
> + ret = nct6694_write_msg(priv->nct6694, &cmd_hd, setting);
> + if (ret)
> + return ret;
> +
> + priv->can.state = CAN_STATE_ERROR_ACTIVE;
> +
> + return 0;
> +}
> +
> +static void nct6694_canfd_stop(struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + struct nct6694_canfd_setting *setting __free(kfree) = NULL;
> + const struct nct6694_cmd_header cmd_hd = {
> + .mod = NCT6694_CANFD_MOD,
> + .cmd = NCT6694_CANFD_SETTING,
> + .sel = ndev->dev_port,
> + .len = cpu_to_le16(sizeof(*setting))
> + };
> +
> + /* The NCT6694 cannot be stopped. To ensure safe operation and avoid
> + * interference, the control mode is set to Listen-Only mode. This
> + * mode allows the device to monitor bus activity without actively
> + * participating in communication.
> + */
> + setting = kzalloc(sizeof(*setting), GFP_KERNEL);
> + if (!setting)
> + return;
> +
> + nct6694_read_msg(priv->nct6694, &cmd_hd, setting);
> + setting->ctrl1 = cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_MON);
> + setting->active = NCT6694_CANFD_SETTING_ACTIVE_CTRL1;
> + nct6694_write_msg(priv->nct6694, &cmd_hd, setting);
> +
> + priv->can.state = CAN_STATE_STOPPED;
> +}
> +
> +static int nct6694_canfd_close(struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> +
make this inverse to nct6694_canfd_open()
> + netif_stop_queue(ndev);
> + can_rx_offload_disable(&priv->offload);
> + nct6694_canfd_stop(ndev);
> + free_irq(ndev->irq, ndev);
> + destroy_workqueue(priv->wq);
> + close_candev(ndev);
> + return 0;
> +}
> +
> +static int nct6694_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
> +{
> + int ret;
> +
> + switch (mode) {
> + case CAN_MODE_START:
> + ret = nct6694_canfd_start(ndev);
> + if (ret)
> + return ret;
> +
> + netif_wake_queue(ndev);
> + break;
> +
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> + return ret;
> +}
> +
> +static int nct6694_canfd_open(struct net_device *ndev)
> +{
> + struct nct6694_canfd_priv *priv = netdev_priv(ndev);
> + int ret;
> +
> + ret = open_candev(ndev);
> + if (ret)
> + return ret;
> +
> + can_rx_offload_enable(&priv->offload);
> +
> + ret = request_threaded_irq(ndev->irq, NULL,
> + nct6694_canfd_irq, IRQF_ONESHOT,
> + "nct6694_canfd", ndev);
> + if (ret) {
> + netdev_err(ndev, "Failed to request IRQ\n");
> + goto close_candev;
nitpick: rename to can_rx_offload_disable
> + }
> +
> + priv->wq = alloc_ordered_workqueue("%s-nct6694_wq",
> + WQ_FREEZABLE | WQ_MEM_RECLAIM,
> + ndev->name);
> + if (!priv->wq) {
> + ret = -ENOMEM;
> + goto free_irq;
> + }
> +
> + ret = nct6694_canfd_start(ndev);
> + if (ret)
> + goto destroy_wq;
> +
> + netif_start_queue(ndev);
> +
> + return 0;
> +
> +destroy_wq:
> + destroy_workqueue(priv->wq);
> +free_irq:
> + free_irq(ndev->irq, ndev);
> +close_candev:
> + can_rx_offload_disable(&priv->offload);
> + close_candev(ndev);
> + return ret;
> +}
> +
> +static const struct net_device_ops nct6694_canfd_netdev_ops = {
> + .ndo_open = nct6694_canfd_open,
> + .ndo_stop = nct6694_canfd_close,
> + .ndo_start_xmit = nct6694_canfd_start_xmit,
> + .ndo_change_mtu = can_change_mtu,
> +};
> +
> +static const struct ethtool_ops nct6694_canfd_ethtool_ops = {
> + .get_ts_info = ethtool_op_get_ts_info,
> +};
> +
> +static int nct6694_canfd_get_clock(struct nct6694_canfd_priv *priv)
> +{
> + struct nct6694_canfd_information *info __free(kfree) = NULL;
> + static const struct nct6694_cmd_header cmd_hd = {
> + .mod = NCT6694_CANFD_MOD,
> + .cmd = NCT6694_CANFD_INFORMATION,
> + .sel = NCT6694_CANFD_INFORMATION_SEL,
> + .len = cpu_to_le16(sizeof(*info))
> + };
> + int ret, can_clk;
> +
> + info = kzalloc(sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + ret = nct6694_read_msg(priv->nct6694, &cmd_hd, info);
> + if (ret)
> + return ret;
> +
> + can_clk = le32_to_cpu(info->can_clk);
return le32_to_cpu(info->can_clk);
> +
> + return can_clk;
> +}
> +
> +static int nct6694_canfd_probe(struct platform_device *pdev)
> +{
> + const struct mfd_cell *cell = mfd_get_cell(pdev);
> + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent);
> + struct nct6694_canfd_priv *priv;
> + struct net_device *ndev;
> + int ret, irq, can_clk;
> +
> + irq = irq_create_mapping(nct6694->domain,
> + NCT6694_IRQ_CAN0 + cell->id);
> + if (!irq)
> + return irq;
> +
> + ndev = alloc_candev(sizeof(struct nct6694_canfd_priv), 1);
> + if (!ndev) {
> + ret = -ENOMEM;
> + goto dispose_irq;
> + }
> +
> + ndev->irq = irq;
> + ndev->flags |= IFF_ECHO;
> + ndev->dev_port = cell->id;
> + ndev->netdev_ops = &nct6694_canfd_netdev_ops;
> + ndev->ethtool_ops = &nct6694_canfd_ethtool_ops;
> +
> + priv = netdev_priv(ndev);
> + priv->nct6694 = nct6694;
> + priv->ndev = ndev;
> +
> + can_clk = nct6694_canfd_get_clock(priv);
> + if (can_clk < 0) {
> + ret = dev_err_probe(&pdev->dev, can_clk,
> + "Failed to get clock\n");
> + goto free_candev;
> + }
> +
> + INIT_WORK(&priv->tx_work, nct6694_canfd_tx_work);
> +
> + priv->can.clock.freq = can_clk;
> + priv->can.bittiming_const = &nct6694_canfd_bittiming_nominal_const;
> + priv->can.data_bittiming_const = &nct6694_canfd_bittiming_data_const;
> + priv->can.do_set_mode = nct6694_canfd_set_mode;
> + priv->can.do_get_berr_counter = nct6694_canfd_get_berr_counter;
> + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> + CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_BERR_REPORTING |
> + CAN_CTRLMODE_FD_NON_ISO;
> +
> + ret = can_set_static_ctrlmode(ndev, CAN_CTRLMODE_FD);
> + if (ret)
> + goto free_candev;
> +
> + ret = can_rx_offload_add_manual(ndev, &priv->offload,
> + NCT6694_NAPI_WEIGHT);
> + if (ret) {
> + dev_err_probe(&pdev->dev, ret, "Failed to add rx_offload\n");
> + goto free_candev;
> + }
> +
> + platform_set_drvdata(pdev, priv);
> + SET_NETDEV_DEV(priv->ndev, &pdev->dev);
> +
> + ret = register_candev(priv->ndev);
> + if (ret)
> + goto rx_offload_del;
> +
> + return 0;
> +
> +rx_offload_del:
> + can_rx_offload_del(&priv->offload);
> +free_candev:
> + free_candev(ndev);
> +dispose_irq:
> + irq_dispose_mapping(irq);
> + return ret;
> +}
> +
> +static void nct6694_canfd_remove(struct platform_device *pdev)
> +{
> + struct nct6694_canfd_priv *priv = platform_get_drvdata(pdev);
> + struct net_device *ndev = priv->ndev;
> +
> + unregister_candev(ndev);
> + irq_dispose_mapping(ndev->irq);
> + can_rx_offload_del(&priv->offload);
> + free_candev(ndev);
Make the order inverse to the nct6694_canfd_probe() function.
> +}
> +
> +static struct platform_driver nct6694_canfd_driver = {
> + .driver = {
> + .name = DEVICE_NAME,
> + },
> + .probe = nct6694_canfd_probe,
> + .remove = nct6694_canfd_remove,
> +};
> +
> +module_platform_driver(nct6694_canfd_driver);
> +
> +MODULE_DESCRIPTION("USB-CAN FD driver for NCT6694");
> +MODULE_AUTHOR("Ming Yu <tmyu0@...oton.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.34.1
regards,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung Nürnberg | Phone: +49-5121-206917-129 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-9 |
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