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mirror-linux/drivers/net/can/usb/nct6694_canfd.c

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// SPDX-License-Identifier: GPL-2.0
/* Nuvoton NCT6694 Socket CANfd driver based on USB interface.
*
* Copyright (C) 2025 Nuvoton Technology Corp.
*/
#include <linux/bitfield.h>
#include <linux/can/dev.h>
#include <linux/can/rx-offload.h>
#include <linux/ethtool.h>
#include <linux/idr.h>
#include <linux/irqdomain.h>
#include <linux/kernel.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)
#define NCT6694_CANFD_SETTING_DBTP_TDC BIT(23)
/* 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 */
/* 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 *n_bt = &priv->can.bittiming;
const struct can_bittiming *d_bt = &priv->can.fd.data_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))
};
u32 en_tdc;
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));
if (d_bt->brp <= 2)
en_tdc = NCT6694_CANFD_SETTING_DBTP_TDC;
else
en_tdc = 0;
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) |
en_tdc);
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);
netif_stop_queue(ndev);
nct6694_canfd_stop(ndev);
destroy_workqueue(priv->wq);
free_irq(ndev->irq, ndev);
can_rx_offload_disable(&priv->offload);
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 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);
can_rx_offload_disable:
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;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
ret = nct6694_read_msg(priv->nct6694, &cmd_hd, info);
if (ret)
return ret;
return le32_to_cpu(info->can_clk);
}
static int nct6694_canfd_probe(struct platform_device *pdev)
{
struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent);
struct nct6694_canfd_priv *priv;
struct net_device *ndev;
int port, irq, ret, can_clk;
port = ida_alloc(&nct6694->canfd_ida, GFP_KERNEL);
if (port < 0)
return port;
irq = irq_create_mapping(nct6694->domain,
NCT6694_IRQ_CAN0 + port);
if (!irq) {
ret = -EINVAL;
goto free_ida;
}
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 = port;
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.fd.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);
free_ida:
ida_free(&nct6694->canfd_ida, port);
return ret;
}
static void nct6694_canfd_remove(struct platform_device *pdev)
{
struct nct6694_canfd_priv *priv = platform_get_drvdata(pdev);
struct nct6694 *nct6694 = priv->nct6694;
struct net_device *ndev = priv->ndev;
int port = ndev->dev_port;
int irq = ndev->irq;
unregister_candev(ndev);
can_rx_offload_del(&priv->offload);
free_candev(ndev);
irq_dispose_mapping(irq);
ida_free(&nct6694->canfd_ida, port);
}
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@nuvoton.com>");
MODULE_LICENSE("GPL");
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