xref: /linux/drivers/net/can/usb/nct6694_canfd.c (revision ec2e0fb07d789976c601bec19ecced7a501c3705)
1*8a204684SMing Yu // SPDX-License-Identifier: GPL-2.0
2*8a204684SMing Yu /* Nuvoton NCT6694 Socket CANfd driver based on USB interface.
3*8a204684SMing Yu  *
4*8a204684SMing Yu  * Copyright (C) 2025 Nuvoton Technology Corp.
5*8a204684SMing Yu  */
6*8a204684SMing Yu 
7*8a204684SMing Yu #include <linux/bitfield.h>
8*8a204684SMing Yu #include <linux/can/dev.h>
9*8a204684SMing Yu #include <linux/can/rx-offload.h>
10*8a204684SMing Yu #include <linux/ethtool.h>
11*8a204684SMing Yu #include <linux/idr.h>
12*8a204684SMing Yu #include <linux/irqdomain.h>
13*8a204684SMing Yu #include <linux/kernel.h>
14*8a204684SMing Yu #include <linux/mfd/nct6694.h>
15*8a204684SMing Yu #include <linux/module.h>
16*8a204684SMing Yu #include <linux/netdevice.h>
17*8a204684SMing Yu #include <linux/platform_device.h>
18*8a204684SMing Yu 
19*8a204684SMing Yu #define DEVICE_NAME "nct6694-canfd"
20*8a204684SMing Yu 
21*8a204684SMing Yu /* USB command module type for NCT6694 CANfd controller.
22*8a204684SMing Yu  * This defines the module type used for communication with the NCT6694
23*8a204684SMing Yu  * CANfd controller over the USB interface.
24*8a204684SMing Yu  */
25*8a204684SMing Yu #define NCT6694_CANFD_MOD			0x05
26*8a204684SMing Yu 
27*8a204684SMing Yu /* Command 00h - CAN Setting and Initialization */
28*8a204684SMing Yu #define NCT6694_CANFD_SETTING			0x00
29*8a204684SMing Yu #define NCT6694_CANFD_SETTING_ACTIVE_CTRL1	BIT(0)
30*8a204684SMing Yu #define NCT6694_CANFD_SETTING_ACTIVE_CTRL2	BIT(1)
31*8a204684SMing Yu #define NCT6694_CANFD_SETTING_ACTIVE_NBTP_DBTP	BIT(2)
32*8a204684SMing Yu #define NCT6694_CANFD_SETTING_CTRL1_MON		BIT(0)
33*8a204684SMing Yu #define NCT6694_CANFD_SETTING_CTRL1_NISO	BIT(1)
34*8a204684SMing Yu #define NCT6694_CANFD_SETTING_CTRL1_LBCK	BIT(2)
35*8a204684SMing Yu #define NCT6694_CANFD_SETTING_NBTP_NTSEG2	GENMASK(6, 0)
36*8a204684SMing Yu #define NCT6694_CANFD_SETTING_NBTP_NTSEG1	GENMASK(15, 8)
37*8a204684SMing Yu #define NCT6694_CANFD_SETTING_NBTP_NBRP		GENMASK(24, 16)
38*8a204684SMing Yu #define NCT6694_CANFD_SETTING_NBTP_NSJW		GENMASK(31, 25)
39*8a204684SMing Yu #define NCT6694_CANFD_SETTING_DBTP_DSJW		GENMASK(3, 0)
40*8a204684SMing Yu #define NCT6694_CANFD_SETTING_DBTP_DTSEG2	GENMASK(7, 4)
41*8a204684SMing Yu #define NCT6694_CANFD_SETTING_DBTP_DTSEG1	GENMASK(12, 8)
42*8a204684SMing Yu #define NCT6694_CANFD_SETTING_DBTP_DBRP		GENMASK(20, 16)
43*8a204684SMing Yu #define NCT6694_CANFD_SETTING_DBTP_TDC		BIT(23)
44*8a204684SMing Yu 
45*8a204684SMing Yu /* Command 01h - CAN Information */
46*8a204684SMing Yu #define NCT6694_CANFD_INFORMATION		0x01
47*8a204684SMing Yu #define NCT6694_CANFD_INFORMATION_SEL		0x00
48*8a204684SMing Yu 
49*8a204684SMing Yu /* Command 02h - CAN Event */
50*8a204684SMing Yu #define NCT6694_CANFD_EVENT			0x02
51*8a204684SMing Yu #define NCT6694_CANFD_EVENT_SEL(idx, mask)	\
52*8a204684SMing Yu 	((idx ? 0x80 : 0x00) | ((mask) & 0x7F))
53*8a204684SMing Yu 
54*8a204684SMing Yu #define NCT6694_CANFD_EVENT_MASK		GENMASK(5, 0)
55*8a204684SMing Yu #define NCT6694_CANFD_EVT_TX_FIFO_EMPTY		BIT(7)	/* Read-clear */
56*8a204684SMing Yu #define NCT6694_CANFD_EVT_RX_DATA_LOST		BIT(5)	/* Read-clear */
57*8a204684SMing Yu #define NCT6694_CANFD_EVT_RX_DATA_IN		BIT(7)	/* Read-clear */
58*8a204684SMing Yu 
59*8a204684SMing Yu /* Command 10h - CAN Deliver */
60*8a204684SMing Yu #define NCT6694_CANFD_DELIVER			0x10
61*8a204684SMing Yu #define NCT6694_CANFD_DELIVER_SEL(buf_cnt)	\
62*8a204684SMing Yu 	((buf_cnt) & 0xFF)
63*8a204684SMing Yu 
64*8a204684SMing Yu /* Command 11h - CAN Receive */
65*8a204684SMing Yu #define NCT6694_CANFD_RECEIVE			0x11
66*8a204684SMing Yu #define NCT6694_CANFD_RECEIVE_SEL(idx, buf_cnt)	\
67*8a204684SMing Yu 	((idx ? 0x80 : 0x00) | ((buf_cnt) & 0x7F))
68*8a204684SMing Yu 
69*8a204684SMing Yu #define NCT6694_CANFD_FRAME_TAG(idx)		(0xC0 | (idx))
70*8a204684SMing Yu #define NCT6694_CANFD_FRAME_FLAG_EFF		BIT(0)
71*8a204684SMing Yu #define NCT6694_CANFD_FRAME_FLAG_RTR		BIT(1)
72*8a204684SMing Yu #define NCT6694_CANFD_FRAME_FLAG_FD		BIT(2)
73*8a204684SMing Yu #define NCT6694_CANFD_FRAME_FLAG_BRS		BIT(3)
74*8a204684SMing Yu #define NCT6694_CANFD_FRAME_FLAG_ERR		BIT(4)
75*8a204684SMing Yu 
76*8a204684SMing Yu #define NCT6694_NAPI_WEIGHT			32
77*8a204684SMing Yu 
78*8a204684SMing Yu enum nct6694_event_err {
79*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_NO_ERROR = 0,
80*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_CRC_ERROR,
81*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_STUFF_ERROR,
82*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_ACK_ERROR,
83*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_FORM_ERROR,
84*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_BIT_ERROR,
85*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_TIMEOUT_ERROR,
86*8a204684SMing Yu 	NCT6694_CANFD_EVT_ERR_UNKNOWN_ERROR,
87*8a204684SMing Yu };
88*8a204684SMing Yu 
89*8a204684SMing Yu enum nct6694_event_status {
90*8a204684SMing Yu 	NCT6694_CANFD_EVT_STS_ERROR_ACTIVE = 0,
91*8a204684SMing Yu 	NCT6694_CANFD_EVT_STS_ERROR_PASSIVE,
92*8a204684SMing Yu 	NCT6694_CANFD_EVT_STS_BUS_OFF,
93*8a204684SMing Yu 	NCT6694_CANFD_EVT_STS_WARNING,
94*8a204684SMing Yu };
95*8a204684SMing Yu 
96*8a204684SMing Yu struct __packed nct6694_canfd_setting {
97*8a204684SMing Yu 	__le32 nbr;
98*8a204684SMing Yu 	__le32 dbr;
99*8a204684SMing Yu 	u8 active;
100*8a204684SMing Yu 	u8 reserved[3];
101*8a204684SMing Yu 	__le16 ctrl1;
102*8a204684SMing Yu 	__le16 ctrl2;
103*8a204684SMing Yu 	__le32 nbtp;
104*8a204684SMing Yu 	__le32 dbtp;
105*8a204684SMing Yu };
106*8a204684SMing Yu 
107*8a204684SMing Yu struct __packed nct6694_canfd_information {
108*8a204684SMing Yu 	u8 tx_fifo_cnt;
109*8a204684SMing Yu 	u8 rx_fifo_cnt;
110*8a204684SMing Yu 	u8 reserved[2];
111*8a204684SMing Yu 	__le32 can_clk;
112*8a204684SMing Yu };
113*8a204684SMing Yu 
114*8a204684SMing Yu struct __packed nct6694_canfd_event {
115*8a204684SMing Yu 	u8 err;
116*8a204684SMing Yu 	u8 status;
117*8a204684SMing Yu 	u8 tx_evt;
118*8a204684SMing Yu 	u8 rx_evt;
119*8a204684SMing Yu 	u8 rec;
120*8a204684SMing Yu 	u8 tec;
121*8a204684SMing Yu 	u8 reserved[2];
122*8a204684SMing Yu };
123*8a204684SMing Yu 
124*8a204684SMing Yu struct __packed nct6694_canfd_frame {
125*8a204684SMing Yu 	u8 tag;
126*8a204684SMing Yu 	u8 flag;
127*8a204684SMing Yu 	u8 reserved;
128*8a204684SMing Yu 	u8 length;
129*8a204684SMing Yu 	__le32 id;
130*8a204684SMing Yu 	u8 data[CANFD_MAX_DLEN];
131*8a204684SMing Yu };
132*8a204684SMing Yu 
133*8a204684SMing Yu struct nct6694_canfd_priv {
134*8a204684SMing Yu 	struct can_priv can;	/* must be the first member */
135*8a204684SMing Yu 	struct can_rx_offload offload;
136*8a204684SMing Yu 	struct net_device *ndev;
137*8a204684SMing Yu 	struct nct6694 *nct6694;
138*8a204684SMing Yu 	struct workqueue_struct *wq;
139*8a204684SMing Yu 	struct work_struct tx_work;
140*8a204684SMing Yu 	struct nct6694_canfd_frame tx;
141*8a204684SMing Yu 	struct nct6694_canfd_frame rx;
142*8a204684SMing Yu 	struct nct6694_canfd_event event[2];
143*8a204684SMing Yu 	struct can_berr_counter bec;
144*8a204684SMing Yu };
145*8a204684SMing Yu 
146*8a204684SMing Yu static inline struct nct6694_canfd_priv *rx_offload_to_priv(struct can_rx_offload *offload)
147*8a204684SMing Yu {
148*8a204684SMing Yu 	return container_of(offload, struct nct6694_canfd_priv, offload);
149*8a204684SMing Yu }
150*8a204684SMing Yu 
151*8a204684SMing Yu static const struct can_bittiming_const nct6694_canfd_bittiming_nominal_const = {
152*8a204684SMing Yu 	.name = DEVICE_NAME,
153*8a204684SMing Yu 	.tseg1_min = 1,
154*8a204684SMing Yu 	.tseg1_max = 256,
155*8a204684SMing Yu 	.tseg2_min = 1,
156*8a204684SMing Yu 	.tseg2_max = 128,
157*8a204684SMing Yu 	.sjw_max = 128,
158*8a204684SMing Yu 	.brp_min = 1,
159*8a204684SMing Yu 	.brp_max = 512,
160*8a204684SMing Yu 	.brp_inc = 1,
161*8a204684SMing Yu };
162*8a204684SMing Yu 
163*8a204684SMing Yu static const struct can_bittiming_const nct6694_canfd_bittiming_data_const = {
164*8a204684SMing Yu 	.name = DEVICE_NAME,
165*8a204684SMing Yu 	.tseg1_min = 1,
166*8a204684SMing Yu 	.tseg1_max = 32,
167*8a204684SMing Yu 	.tseg2_min = 1,
168*8a204684SMing Yu 	.tseg2_max = 16,
169*8a204684SMing Yu 	.sjw_max = 16,
170*8a204684SMing Yu 	.brp_min = 1,
171*8a204684SMing Yu 	.brp_max = 32,
172*8a204684SMing Yu 	.brp_inc = 1,
173*8a204684SMing Yu };
174*8a204684SMing Yu 
175*8a204684SMing Yu static void nct6694_canfd_rx_offload(struct can_rx_offload *offload,
176*8a204684SMing Yu 				     struct sk_buff *skb)
177*8a204684SMing Yu {
178*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = rx_offload_to_priv(offload);
179*8a204684SMing Yu 	int ret;
180*8a204684SMing Yu 
181*8a204684SMing Yu 	ret = can_rx_offload_queue_tail(offload, skb);
182*8a204684SMing Yu 	if (ret)
183*8a204684SMing Yu 		priv->ndev->stats.rx_fifo_errors++;
184*8a204684SMing Yu }
185*8a204684SMing Yu 
186*8a204684SMing Yu static void nct6694_canfd_handle_lost_msg(struct net_device *ndev)
187*8a204684SMing Yu {
188*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
189*8a204684SMing Yu 	struct net_device_stats *stats = &ndev->stats;
190*8a204684SMing Yu 	struct can_frame *cf;
191*8a204684SMing Yu 	struct sk_buff *skb;
192*8a204684SMing Yu 
193*8a204684SMing Yu 	netdev_dbg(ndev, "RX FIFO overflow, message(s) lost.\n");
194*8a204684SMing Yu 
195*8a204684SMing Yu 	stats->rx_errors++;
196*8a204684SMing Yu 	stats->rx_over_errors++;
197*8a204684SMing Yu 
198*8a204684SMing Yu 	skb = alloc_can_err_skb(ndev, &cf);
199*8a204684SMing Yu 	if (!skb)
200*8a204684SMing Yu 		return;
201*8a204684SMing Yu 
202*8a204684SMing Yu 	cf->can_id |= CAN_ERR_CRTL;
203*8a204684SMing Yu 	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
204*8a204684SMing Yu 
205*8a204684SMing Yu 	nct6694_canfd_rx_offload(&priv->offload, skb);
206*8a204684SMing Yu }
207*8a204684SMing Yu 
208*8a204684SMing Yu static void nct6694_canfd_handle_rx(struct net_device *ndev, u8 rx_evt)
209*8a204684SMing Yu {
210*8a204684SMing Yu 	struct net_device_stats *stats = &ndev->stats;
211*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
212*8a204684SMing Yu 	struct nct6694_canfd_frame *frame = &priv->rx;
213*8a204684SMing Yu 	const struct nct6694_cmd_header cmd_hd = {
214*8a204684SMing Yu 		.mod = NCT6694_CANFD_MOD,
215*8a204684SMing Yu 		.cmd = NCT6694_CANFD_RECEIVE,
216*8a204684SMing Yu 		.sel = NCT6694_CANFD_RECEIVE_SEL(ndev->dev_port, 1),
217*8a204684SMing Yu 		.len = cpu_to_le16(sizeof(*frame))
218*8a204684SMing Yu 	};
219*8a204684SMing Yu 	struct sk_buff *skb;
220*8a204684SMing Yu 	int ret;
221*8a204684SMing Yu 
222*8a204684SMing Yu 	ret = nct6694_read_msg(priv->nct6694, &cmd_hd, frame);
223*8a204684SMing Yu 	if (ret)
224*8a204684SMing Yu 		return;
225*8a204684SMing Yu 
226*8a204684SMing Yu 	if (frame->flag & NCT6694_CANFD_FRAME_FLAG_FD) {
227*8a204684SMing Yu 		struct canfd_frame *cfd;
228*8a204684SMing Yu 
229*8a204684SMing Yu 		skb = alloc_canfd_skb(priv->ndev, &cfd);
230*8a204684SMing Yu 		if (!skb) {
231*8a204684SMing Yu 			stats->rx_dropped++;
232*8a204684SMing Yu 			return;
233*8a204684SMing Yu 		}
234*8a204684SMing Yu 
235*8a204684SMing Yu 		cfd->can_id = le32_to_cpu(frame->id);
236*8a204684SMing Yu 		cfd->len = canfd_sanitize_len(frame->length);
237*8a204684SMing Yu 		if (frame->flag & NCT6694_CANFD_FRAME_FLAG_EFF)
238*8a204684SMing Yu 			cfd->can_id |= CAN_EFF_FLAG;
239*8a204684SMing Yu 		if (frame->flag & NCT6694_CANFD_FRAME_FLAG_BRS)
240*8a204684SMing Yu 			cfd->flags |= CANFD_BRS;
241*8a204684SMing Yu 		if (frame->flag & NCT6694_CANFD_FRAME_FLAG_ERR)
242*8a204684SMing Yu 			cfd->flags |= CANFD_ESI;
243*8a204684SMing Yu 
244*8a204684SMing Yu 		memcpy(cfd->data, frame->data, cfd->len);
245*8a204684SMing Yu 	} else {
246*8a204684SMing Yu 		struct can_frame *cf;
247*8a204684SMing Yu 
248*8a204684SMing Yu 		skb = alloc_can_skb(priv->ndev, &cf);
249*8a204684SMing Yu 		if (!skb) {
250*8a204684SMing Yu 			stats->rx_dropped++;
251*8a204684SMing Yu 			return;
252*8a204684SMing Yu 		}
253*8a204684SMing Yu 
254*8a204684SMing Yu 		cf->can_id = le32_to_cpu(frame->id);
255*8a204684SMing Yu 		cf->len = can_cc_dlc2len(frame->length);
256*8a204684SMing Yu 		if (frame->flag & NCT6694_CANFD_FRAME_FLAG_EFF)
257*8a204684SMing Yu 			cf->can_id |= CAN_EFF_FLAG;
258*8a204684SMing Yu 
259*8a204684SMing Yu 		if (frame->flag & NCT6694_CANFD_FRAME_FLAG_RTR)
260*8a204684SMing Yu 			cf->can_id |= CAN_RTR_FLAG;
261*8a204684SMing Yu 		else
262*8a204684SMing Yu 			memcpy(cf->data, frame->data, cf->len);
263*8a204684SMing Yu 	}
264*8a204684SMing Yu 
265*8a204684SMing Yu 	nct6694_canfd_rx_offload(&priv->offload, skb);
266*8a204684SMing Yu }
267*8a204684SMing Yu 
268*8a204684SMing Yu static int nct6694_canfd_get_berr_counter(const struct net_device *ndev,
269*8a204684SMing Yu 					  struct can_berr_counter *bec)
270*8a204684SMing Yu {
271*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
272*8a204684SMing Yu 
273*8a204684SMing Yu 	*bec = priv->bec;
274*8a204684SMing Yu 
275*8a204684SMing Yu 	return 0;
276*8a204684SMing Yu }
277*8a204684SMing Yu 
278*8a204684SMing Yu static void nct6694_canfd_handle_state_change(struct net_device *ndev, u8 status)
279*8a204684SMing Yu {
280*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
281*8a204684SMing Yu 	enum can_state new_state, rx_state, tx_state;
282*8a204684SMing Yu 	struct can_berr_counter bec;
283*8a204684SMing Yu 	struct can_frame *cf;
284*8a204684SMing Yu 	struct sk_buff *skb;
285*8a204684SMing Yu 
286*8a204684SMing Yu 	nct6694_canfd_get_berr_counter(ndev, &bec);
287*8a204684SMing Yu 	can_state_get_by_berr_counter(ndev, &bec, &tx_state, &rx_state);
288*8a204684SMing Yu 
289*8a204684SMing Yu 	new_state = max(tx_state, rx_state);
290*8a204684SMing Yu 
291*8a204684SMing Yu 	/* state hasn't changed */
292*8a204684SMing Yu 	if (new_state == priv->can.state)
293*8a204684SMing Yu 		return;
294*8a204684SMing Yu 
295*8a204684SMing Yu 	skb = alloc_can_err_skb(ndev, &cf);
296*8a204684SMing Yu 
297*8a204684SMing Yu 	can_change_state(ndev, cf, tx_state, rx_state);
298*8a204684SMing Yu 
299*8a204684SMing Yu 	if (new_state == CAN_STATE_BUS_OFF) {
300*8a204684SMing Yu 		can_bus_off(ndev);
301*8a204684SMing Yu 	} else if (cf) {
302*8a204684SMing Yu 		cf->can_id |= CAN_ERR_CNT;
303*8a204684SMing Yu 		cf->data[6] = bec.txerr;
304*8a204684SMing Yu 		cf->data[7] = bec.rxerr;
305*8a204684SMing Yu 	}
306*8a204684SMing Yu 
307*8a204684SMing Yu 	if (skb)
308*8a204684SMing Yu 		nct6694_canfd_rx_offload(&priv->offload, skb);
309*8a204684SMing Yu }
310*8a204684SMing Yu 
311*8a204684SMing Yu static void nct6694_canfd_handle_bus_err(struct net_device *ndev, u8 bus_err)
312*8a204684SMing Yu {
313*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
314*8a204684SMing Yu 	struct can_frame *cf;
315*8a204684SMing Yu 	struct sk_buff *skb;
316*8a204684SMing Yu 
317*8a204684SMing Yu 	priv->can.can_stats.bus_error++;
318*8a204684SMing Yu 
319*8a204684SMing Yu 	skb = alloc_can_err_skb(ndev, &cf);
320*8a204684SMing Yu 	if (cf)
321*8a204684SMing Yu 		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
322*8a204684SMing Yu 
323*8a204684SMing Yu 	switch (bus_err) {
324*8a204684SMing Yu 	case NCT6694_CANFD_EVT_ERR_CRC_ERROR:
325*8a204684SMing Yu 		netdev_dbg(ndev, "CRC error\n");
326*8a204684SMing Yu 		ndev->stats.rx_errors++;
327*8a204684SMing Yu 		if (cf)
328*8a204684SMing Yu 			cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
329*8a204684SMing Yu 		break;
330*8a204684SMing Yu 
331*8a204684SMing Yu 	case NCT6694_CANFD_EVT_ERR_STUFF_ERROR:
332*8a204684SMing Yu 		netdev_dbg(ndev, "Stuff error\n");
333*8a204684SMing Yu 		ndev->stats.rx_errors++;
334*8a204684SMing Yu 		if (cf)
335*8a204684SMing Yu 			cf->data[2] |= CAN_ERR_PROT_STUFF;
336*8a204684SMing Yu 		break;
337*8a204684SMing Yu 
338*8a204684SMing Yu 	case NCT6694_CANFD_EVT_ERR_ACK_ERROR:
339*8a204684SMing Yu 		netdev_dbg(ndev, "Ack error\n");
340*8a204684SMing Yu 		ndev->stats.tx_errors++;
341*8a204684SMing Yu 		if (cf) {
342*8a204684SMing Yu 			cf->can_id |= CAN_ERR_ACK;
343*8a204684SMing Yu 			cf->data[2] |= CAN_ERR_PROT_TX;
344*8a204684SMing Yu 		}
345*8a204684SMing Yu 		break;
346*8a204684SMing Yu 
347*8a204684SMing Yu 	case NCT6694_CANFD_EVT_ERR_FORM_ERROR:
348*8a204684SMing Yu 		netdev_dbg(ndev, "Form error\n");
349*8a204684SMing Yu 		ndev->stats.rx_errors++;
350*8a204684SMing Yu 		if (cf)
351*8a204684SMing Yu 			cf->data[2] |= CAN_ERR_PROT_FORM;
352*8a204684SMing Yu 		break;
353*8a204684SMing Yu 
354*8a204684SMing Yu 	case NCT6694_CANFD_EVT_ERR_BIT_ERROR:
355*8a204684SMing Yu 		netdev_dbg(ndev, "Bit error\n");
356*8a204684SMing Yu 		ndev->stats.tx_errors++;
357*8a204684SMing Yu 		if (cf)
358*8a204684SMing Yu 			cf->data[2] |= CAN_ERR_PROT_TX | CAN_ERR_PROT_BIT;
359*8a204684SMing Yu 		break;
360*8a204684SMing Yu 
361*8a204684SMing Yu 	default:
362*8a204684SMing Yu 		break;
363*8a204684SMing Yu 	}
364*8a204684SMing Yu 
365*8a204684SMing Yu 	if (skb)
366*8a204684SMing Yu 		nct6694_canfd_rx_offload(&priv->offload, skb);
367*8a204684SMing Yu }
368*8a204684SMing Yu 
369*8a204684SMing Yu static void nct6694_canfd_handle_tx(struct net_device *ndev)
370*8a204684SMing Yu {
371*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
372*8a204684SMing Yu 	struct net_device_stats *stats = &ndev->stats;
373*8a204684SMing Yu 
374*8a204684SMing Yu 	stats->tx_bytes += can_rx_offload_get_echo_skb_queue_tail(&priv->offload,
375*8a204684SMing Yu 								  0, NULL);
376*8a204684SMing Yu 	stats->tx_packets++;
377*8a204684SMing Yu 	netif_wake_queue(ndev);
378*8a204684SMing Yu }
379*8a204684SMing Yu 
380*8a204684SMing Yu static irqreturn_t nct6694_canfd_irq(int irq, void *data)
381*8a204684SMing Yu {
382*8a204684SMing Yu 	struct net_device *ndev = data;
383*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
384*8a204684SMing Yu 	struct nct6694_canfd_event *event = &priv->event[ndev->dev_port];
385*8a204684SMing Yu 	const struct nct6694_cmd_header cmd_hd = {
386*8a204684SMing Yu 		.mod = NCT6694_CANFD_MOD,
387*8a204684SMing Yu 		.cmd = NCT6694_CANFD_EVENT,
388*8a204684SMing Yu 		.sel = NCT6694_CANFD_EVENT_SEL(ndev->dev_port, NCT6694_CANFD_EVENT_MASK),
389*8a204684SMing Yu 		.len = cpu_to_le16(sizeof(priv->event))
390*8a204684SMing Yu 	};
391*8a204684SMing Yu 	irqreturn_t handled = IRQ_NONE;
392*8a204684SMing Yu 	int ret;
393*8a204684SMing Yu 
394*8a204684SMing Yu 	ret = nct6694_read_msg(priv->nct6694, &cmd_hd, priv->event);
395*8a204684SMing Yu 	if (ret < 0)
396*8a204684SMing Yu 		return handled;
397*8a204684SMing Yu 
398*8a204684SMing Yu 	if (event->rx_evt & NCT6694_CANFD_EVT_RX_DATA_IN) {
399*8a204684SMing Yu 		nct6694_canfd_handle_rx(ndev, event->rx_evt);
400*8a204684SMing Yu 		handled = IRQ_HANDLED;
401*8a204684SMing Yu 	}
402*8a204684SMing Yu 
403*8a204684SMing Yu 	if (event->rx_evt & NCT6694_CANFD_EVT_RX_DATA_LOST) {
404*8a204684SMing Yu 		nct6694_canfd_handle_lost_msg(ndev);
405*8a204684SMing Yu 		handled = IRQ_HANDLED;
406*8a204684SMing Yu 	}
407*8a204684SMing Yu 
408*8a204684SMing Yu 	if (event->status) {
409*8a204684SMing Yu 		nct6694_canfd_handle_state_change(ndev, event->status);
410*8a204684SMing Yu 		handled = IRQ_HANDLED;
411*8a204684SMing Yu 	}
412*8a204684SMing Yu 
413*8a204684SMing Yu 	if (event->err != NCT6694_CANFD_EVT_ERR_NO_ERROR) {
414*8a204684SMing Yu 		if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
415*8a204684SMing Yu 			nct6694_canfd_handle_bus_err(ndev, event->err);
416*8a204684SMing Yu 		handled = IRQ_HANDLED;
417*8a204684SMing Yu 	}
418*8a204684SMing Yu 
419*8a204684SMing Yu 	if (event->tx_evt & NCT6694_CANFD_EVT_TX_FIFO_EMPTY) {
420*8a204684SMing Yu 		nct6694_canfd_handle_tx(ndev);
421*8a204684SMing Yu 		handled = IRQ_HANDLED;
422*8a204684SMing Yu 	}
423*8a204684SMing Yu 
424*8a204684SMing Yu 	if (handled)
425*8a204684SMing Yu 		can_rx_offload_threaded_irq_finish(&priv->offload);
426*8a204684SMing Yu 
427*8a204684SMing Yu 	priv->bec.rxerr = event->rec;
428*8a204684SMing Yu 	priv->bec.txerr = event->tec;
429*8a204684SMing Yu 
430*8a204684SMing Yu 	return handled;
431*8a204684SMing Yu }
432*8a204684SMing Yu 
433*8a204684SMing Yu static void nct6694_canfd_tx_work(struct work_struct *work)
434*8a204684SMing Yu {
435*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = container_of(work,
436*8a204684SMing Yu 						       struct nct6694_canfd_priv,
437*8a204684SMing Yu 						       tx_work);
438*8a204684SMing Yu 	struct nct6694_canfd_frame *frame = &priv->tx;
439*8a204684SMing Yu 	struct net_device *ndev = priv->ndev;
440*8a204684SMing Yu 	struct net_device_stats *stats = &ndev->stats;
441*8a204684SMing Yu 	struct sk_buff *skb = priv->can.echo_skb[0];
442*8a204684SMing Yu 	static const struct nct6694_cmd_header cmd_hd = {
443*8a204684SMing Yu 		.mod = NCT6694_CANFD_MOD,
444*8a204684SMing Yu 		.cmd = NCT6694_CANFD_DELIVER,
445*8a204684SMing Yu 		.sel = NCT6694_CANFD_DELIVER_SEL(1),
446*8a204684SMing Yu 		.len = cpu_to_le16(sizeof(*frame))
447*8a204684SMing Yu 	};
448*8a204684SMing Yu 	u32 txid;
449*8a204684SMing Yu 	int err;
450*8a204684SMing Yu 
451*8a204684SMing Yu 	memset(frame, 0, sizeof(*frame));
452*8a204684SMing Yu 
453*8a204684SMing Yu 	frame->tag = NCT6694_CANFD_FRAME_TAG(ndev->dev_port);
454*8a204684SMing Yu 
455*8a204684SMing Yu 	if (can_is_canfd_skb(skb)) {
456*8a204684SMing Yu 		struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
457*8a204684SMing Yu 
458*8a204684SMing Yu 		if (cfd->flags & CANFD_BRS)
459*8a204684SMing Yu 			frame->flag |= NCT6694_CANFD_FRAME_FLAG_BRS;
460*8a204684SMing Yu 
461*8a204684SMing Yu 		if (cfd->can_id & CAN_EFF_FLAG) {
462*8a204684SMing Yu 			txid = cfd->can_id & CAN_EFF_MASK;
463*8a204684SMing Yu 			frame->flag |= NCT6694_CANFD_FRAME_FLAG_EFF;
464*8a204684SMing Yu 		} else {
465*8a204684SMing Yu 			txid = cfd->can_id & CAN_SFF_MASK;
466*8a204684SMing Yu 		}
467*8a204684SMing Yu 		frame->flag |= NCT6694_CANFD_FRAME_FLAG_FD;
468*8a204684SMing Yu 		frame->id = cpu_to_le32(txid);
469*8a204684SMing Yu 		frame->length = canfd_sanitize_len(cfd->len);
470*8a204684SMing Yu 
471*8a204684SMing Yu 		memcpy(frame->data, cfd->data, frame->length);
472*8a204684SMing Yu 	} else {
473*8a204684SMing Yu 		struct can_frame *cf = (struct can_frame *)skb->data;
474*8a204684SMing Yu 
475*8a204684SMing Yu 		if (cf->can_id & CAN_EFF_FLAG) {
476*8a204684SMing Yu 			txid = cf->can_id & CAN_EFF_MASK;
477*8a204684SMing Yu 			frame->flag |= NCT6694_CANFD_FRAME_FLAG_EFF;
478*8a204684SMing Yu 		} else {
479*8a204684SMing Yu 			txid = cf->can_id & CAN_SFF_MASK;
480*8a204684SMing Yu 		}
481*8a204684SMing Yu 
482*8a204684SMing Yu 		if (cf->can_id & CAN_RTR_FLAG)
483*8a204684SMing Yu 			frame->flag |= NCT6694_CANFD_FRAME_FLAG_RTR;
484*8a204684SMing Yu 		else
485*8a204684SMing Yu 			memcpy(frame->data, cf->data, cf->len);
486*8a204684SMing Yu 
487*8a204684SMing Yu 		frame->id = cpu_to_le32(txid);
488*8a204684SMing Yu 		frame->length = cf->len;
489*8a204684SMing Yu 	}
490*8a204684SMing Yu 
491*8a204684SMing Yu 	err = nct6694_write_msg(priv->nct6694, &cmd_hd, frame);
492*8a204684SMing Yu 	if (err) {
493*8a204684SMing Yu 		can_free_echo_skb(ndev, 0, NULL);
494*8a204684SMing Yu 		stats->tx_dropped++;
495*8a204684SMing Yu 		stats->tx_errors++;
496*8a204684SMing Yu 		netif_wake_queue(ndev);
497*8a204684SMing Yu 	}
498*8a204684SMing Yu }
499*8a204684SMing Yu 
500*8a204684SMing Yu static netdev_tx_t nct6694_canfd_start_xmit(struct sk_buff *skb,
501*8a204684SMing Yu 					    struct net_device *ndev)
502*8a204684SMing Yu {
503*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
504*8a204684SMing Yu 
505*8a204684SMing Yu 	if (can_dev_dropped_skb(ndev, skb))
506*8a204684SMing Yu 		return NETDEV_TX_OK;
507*8a204684SMing Yu 
508*8a204684SMing Yu 	netif_stop_queue(ndev);
509*8a204684SMing Yu 	can_put_echo_skb(skb, ndev, 0, 0);
510*8a204684SMing Yu 	queue_work(priv->wq, &priv->tx_work);
511*8a204684SMing Yu 
512*8a204684SMing Yu 	return NETDEV_TX_OK;
513*8a204684SMing Yu }
514*8a204684SMing Yu 
515*8a204684SMing Yu static int nct6694_canfd_start(struct net_device *ndev)
516*8a204684SMing Yu {
517*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
518*8a204684SMing Yu 	const struct can_bittiming *n_bt = &priv->can.bittiming;
519*8a204684SMing Yu 	const struct can_bittiming *d_bt = &priv->can.fd.data_bittiming;
520*8a204684SMing Yu 	struct nct6694_canfd_setting *setting __free(kfree) = NULL;
521*8a204684SMing Yu 	const struct nct6694_cmd_header cmd_hd = {
522*8a204684SMing Yu 		.mod = NCT6694_CANFD_MOD,
523*8a204684SMing Yu 		.cmd = NCT6694_CANFD_SETTING,
524*8a204684SMing Yu 		.sel = ndev->dev_port,
525*8a204684SMing Yu 		.len = cpu_to_le16(sizeof(*setting))
526*8a204684SMing Yu 	};
527*8a204684SMing Yu 	u32 en_tdc;
528*8a204684SMing Yu 	int ret;
529*8a204684SMing Yu 
530*8a204684SMing Yu 	setting = kzalloc(sizeof(*setting), GFP_KERNEL);
531*8a204684SMing Yu 	if (!setting)
532*8a204684SMing Yu 		return -ENOMEM;
533*8a204684SMing Yu 
534*8a204684SMing Yu 	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
535*8a204684SMing Yu 		setting->ctrl1 |= cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_MON);
536*8a204684SMing Yu 
537*8a204684SMing Yu 	if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
538*8a204684SMing Yu 		setting->ctrl1 |= cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_NISO);
539*8a204684SMing Yu 
540*8a204684SMing Yu 	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
541*8a204684SMing Yu 		setting->ctrl1 |= cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_LBCK);
542*8a204684SMing Yu 
543*8a204684SMing Yu 	/* Disable clock divider */
544*8a204684SMing Yu 	setting->ctrl2 = 0;
545*8a204684SMing Yu 
546*8a204684SMing Yu 	setting->nbtp = cpu_to_le32(FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NSJW,
547*8a204684SMing Yu 					       n_bt->sjw - 1) |
548*8a204684SMing Yu 				    FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NBRP,
549*8a204684SMing Yu 					       n_bt->brp - 1) |
550*8a204684SMing Yu 				    FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NTSEG2,
551*8a204684SMing Yu 					       n_bt->phase_seg2 - 1) |
552*8a204684SMing Yu 				    FIELD_PREP(NCT6694_CANFD_SETTING_NBTP_NTSEG1,
553*8a204684SMing Yu 					       n_bt->prop_seg + n_bt->phase_seg1 - 1));
554*8a204684SMing Yu 
555*8a204684SMing Yu 	if (d_bt->brp <= 2)
556*8a204684SMing Yu 		en_tdc = NCT6694_CANFD_SETTING_DBTP_TDC;
557*8a204684SMing Yu 	else
558*8a204684SMing Yu 		en_tdc = 0;
559*8a204684SMing Yu 
560*8a204684SMing Yu 	setting->dbtp = cpu_to_le32(FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DSJW,
561*8a204684SMing Yu 					       d_bt->sjw - 1) |
562*8a204684SMing Yu 				    FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DBRP,
563*8a204684SMing Yu 					       d_bt->brp - 1) |
564*8a204684SMing Yu 				    FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DTSEG2,
565*8a204684SMing Yu 					       d_bt->phase_seg2 - 1) |
566*8a204684SMing Yu 				    FIELD_PREP(NCT6694_CANFD_SETTING_DBTP_DTSEG1,
567*8a204684SMing Yu 					       d_bt->prop_seg + d_bt->phase_seg1 - 1) |
568*8a204684SMing Yu 				    en_tdc);
569*8a204684SMing Yu 
570*8a204684SMing Yu 	setting->active = NCT6694_CANFD_SETTING_ACTIVE_CTRL1 |
571*8a204684SMing Yu 			  NCT6694_CANFD_SETTING_ACTIVE_CTRL2 |
572*8a204684SMing Yu 			  NCT6694_CANFD_SETTING_ACTIVE_NBTP_DBTP;
573*8a204684SMing Yu 
574*8a204684SMing Yu 	ret = nct6694_write_msg(priv->nct6694, &cmd_hd, setting);
575*8a204684SMing Yu 	if (ret)
576*8a204684SMing Yu 		return ret;
577*8a204684SMing Yu 
578*8a204684SMing Yu 	priv->can.state = CAN_STATE_ERROR_ACTIVE;
579*8a204684SMing Yu 
580*8a204684SMing Yu 	return 0;
581*8a204684SMing Yu }
582*8a204684SMing Yu 
583*8a204684SMing Yu static void nct6694_canfd_stop(struct net_device *ndev)
584*8a204684SMing Yu {
585*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
586*8a204684SMing Yu 	struct nct6694_canfd_setting *setting __free(kfree) = NULL;
587*8a204684SMing Yu 	const struct nct6694_cmd_header cmd_hd = {
588*8a204684SMing Yu 		.mod = NCT6694_CANFD_MOD,
589*8a204684SMing Yu 		.cmd = NCT6694_CANFD_SETTING,
590*8a204684SMing Yu 		.sel = ndev->dev_port,
591*8a204684SMing Yu 		.len = cpu_to_le16(sizeof(*setting))
592*8a204684SMing Yu 	};
593*8a204684SMing Yu 
594*8a204684SMing Yu 	/* The NCT6694 cannot be stopped. To ensure safe operation and avoid
595*8a204684SMing Yu 	 * interference, the control mode is set to Listen-Only mode. This
596*8a204684SMing Yu 	 * mode allows the device to monitor bus activity without actively
597*8a204684SMing Yu 	 * participating in communication.
598*8a204684SMing Yu 	 */
599*8a204684SMing Yu 	setting = kzalloc(sizeof(*setting), GFP_KERNEL);
600*8a204684SMing Yu 	if (!setting)
601*8a204684SMing Yu 		return;
602*8a204684SMing Yu 
603*8a204684SMing Yu 	nct6694_read_msg(priv->nct6694, &cmd_hd, setting);
604*8a204684SMing Yu 	setting->ctrl1 = cpu_to_le16(NCT6694_CANFD_SETTING_CTRL1_MON);
605*8a204684SMing Yu 	setting->active = NCT6694_CANFD_SETTING_ACTIVE_CTRL1;
606*8a204684SMing Yu 	nct6694_write_msg(priv->nct6694, &cmd_hd, setting);
607*8a204684SMing Yu 
608*8a204684SMing Yu 	priv->can.state = CAN_STATE_STOPPED;
609*8a204684SMing Yu }
610*8a204684SMing Yu 
611*8a204684SMing Yu static int nct6694_canfd_close(struct net_device *ndev)
612*8a204684SMing Yu {
613*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
614*8a204684SMing Yu 
615*8a204684SMing Yu 	netif_stop_queue(ndev);
616*8a204684SMing Yu 	nct6694_canfd_stop(ndev);
617*8a204684SMing Yu 	destroy_workqueue(priv->wq);
618*8a204684SMing Yu 	free_irq(ndev->irq, ndev);
619*8a204684SMing Yu 	can_rx_offload_disable(&priv->offload);
620*8a204684SMing Yu 	close_candev(ndev);
621*8a204684SMing Yu 	return 0;
622*8a204684SMing Yu }
623*8a204684SMing Yu 
624*8a204684SMing Yu static int nct6694_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
625*8a204684SMing Yu {
626*8a204684SMing Yu 	int ret;
627*8a204684SMing Yu 
628*8a204684SMing Yu 	switch (mode) {
629*8a204684SMing Yu 	case CAN_MODE_START:
630*8a204684SMing Yu 		ret = nct6694_canfd_start(ndev);
631*8a204684SMing Yu 		if (ret)
632*8a204684SMing Yu 			return ret;
633*8a204684SMing Yu 
634*8a204684SMing Yu 		netif_wake_queue(ndev);
635*8a204684SMing Yu 		break;
636*8a204684SMing Yu 
637*8a204684SMing Yu 	default:
638*8a204684SMing Yu 		return -EOPNOTSUPP;
639*8a204684SMing Yu 	}
640*8a204684SMing Yu 
641*8a204684SMing Yu 	return ret;
642*8a204684SMing Yu }
643*8a204684SMing Yu 
644*8a204684SMing Yu static int nct6694_canfd_open(struct net_device *ndev)
645*8a204684SMing Yu {
646*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = netdev_priv(ndev);
647*8a204684SMing Yu 	int ret;
648*8a204684SMing Yu 
649*8a204684SMing Yu 	ret = open_candev(ndev);
650*8a204684SMing Yu 	if (ret)
651*8a204684SMing Yu 		return ret;
652*8a204684SMing Yu 
653*8a204684SMing Yu 	can_rx_offload_enable(&priv->offload);
654*8a204684SMing Yu 
655*8a204684SMing Yu 	ret = request_threaded_irq(ndev->irq, NULL,
656*8a204684SMing Yu 				   nct6694_canfd_irq, IRQF_ONESHOT,
657*8a204684SMing Yu 				   "nct6694_canfd", ndev);
658*8a204684SMing Yu 	if (ret) {
659*8a204684SMing Yu 		netdev_err(ndev, "Failed to request IRQ\n");
660*8a204684SMing Yu 		goto can_rx_offload_disable;
661*8a204684SMing Yu 	}
662*8a204684SMing Yu 
663*8a204684SMing Yu 	priv->wq = alloc_ordered_workqueue("%s-nct6694_wq",
664*8a204684SMing Yu 					   WQ_FREEZABLE | WQ_MEM_RECLAIM,
665*8a204684SMing Yu 					   ndev->name);
666*8a204684SMing Yu 	if (!priv->wq) {
667*8a204684SMing Yu 		ret = -ENOMEM;
668*8a204684SMing Yu 		goto free_irq;
669*8a204684SMing Yu 	}
670*8a204684SMing Yu 
671*8a204684SMing Yu 	ret = nct6694_canfd_start(ndev);
672*8a204684SMing Yu 	if (ret)
673*8a204684SMing Yu 		goto destroy_wq;
674*8a204684SMing Yu 
675*8a204684SMing Yu 	netif_start_queue(ndev);
676*8a204684SMing Yu 
677*8a204684SMing Yu 	return 0;
678*8a204684SMing Yu 
679*8a204684SMing Yu destroy_wq:
680*8a204684SMing Yu 	destroy_workqueue(priv->wq);
681*8a204684SMing Yu free_irq:
682*8a204684SMing Yu 	free_irq(ndev->irq, ndev);
683*8a204684SMing Yu can_rx_offload_disable:
684*8a204684SMing Yu 	can_rx_offload_disable(&priv->offload);
685*8a204684SMing Yu 	close_candev(ndev);
686*8a204684SMing Yu 	return ret;
687*8a204684SMing Yu }
688*8a204684SMing Yu 
689*8a204684SMing Yu static const struct net_device_ops nct6694_canfd_netdev_ops = {
690*8a204684SMing Yu 	.ndo_open = nct6694_canfd_open,
691*8a204684SMing Yu 	.ndo_stop = nct6694_canfd_close,
692*8a204684SMing Yu 	.ndo_start_xmit = nct6694_canfd_start_xmit,
693*8a204684SMing Yu 	.ndo_change_mtu = can_change_mtu,
694*8a204684SMing Yu };
695*8a204684SMing Yu 
696*8a204684SMing Yu static const struct ethtool_ops nct6694_canfd_ethtool_ops = {
697*8a204684SMing Yu 	.get_ts_info = ethtool_op_get_ts_info,
698*8a204684SMing Yu };
699*8a204684SMing Yu 
700*8a204684SMing Yu static int nct6694_canfd_get_clock(struct nct6694_canfd_priv *priv)
701*8a204684SMing Yu {
702*8a204684SMing Yu 	struct nct6694_canfd_information *info __free(kfree) = NULL;
703*8a204684SMing Yu 	static const struct nct6694_cmd_header cmd_hd = {
704*8a204684SMing Yu 		.mod = NCT6694_CANFD_MOD,
705*8a204684SMing Yu 		.cmd = NCT6694_CANFD_INFORMATION,
706*8a204684SMing Yu 		.sel = NCT6694_CANFD_INFORMATION_SEL,
707*8a204684SMing Yu 		.len = cpu_to_le16(sizeof(*info))
708*8a204684SMing Yu 	};
709*8a204684SMing Yu 	int ret;
710*8a204684SMing Yu 
711*8a204684SMing Yu 	info = kzalloc(sizeof(*info), GFP_KERNEL);
712*8a204684SMing Yu 	if (!info)
713*8a204684SMing Yu 		return -ENOMEM;
714*8a204684SMing Yu 
715*8a204684SMing Yu 	ret = nct6694_read_msg(priv->nct6694, &cmd_hd, info);
716*8a204684SMing Yu 	if (ret)
717*8a204684SMing Yu 		return ret;
718*8a204684SMing Yu 
719*8a204684SMing Yu 	return le32_to_cpu(info->can_clk);
720*8a204684SMing Yu }
721*8a204684SMing Yu 
722*8a204684SMing Yu static int nct6694_canfd_probe(struct platform_device *pdev)
723*8a204684SMing Yu {
724*8a204684SMing Yu 	struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent);
725*8a204684SMing Yu 	struct nct6694_canfd_priv *priv;
726*8a204684SMing Yu 	struct net_device *ndev;
727*8a204684SMing Yu 	int port, irq, ret, can_clk;
728*8a204684SMing Yu 
729*8a204684SMing Yu 	port = ida_alloc(&nct6694->canfd_ida, GFP_KERNEL);
730*8a204684SMing Yu 	if (port < 0)
731*8a204684SMing Yu 		return port;
732*8a204684SMing Yu 
733*8a204684SMing Yu 	irq = irq_create_mapping(nct6694->domain,
734*8a204684SMing Yu 				 NCT6694_IRQ_CAN0 + port);
735*8a204684SMing Yu 	if (!irq) {
736*8a204684SMing Yu 		ret = -EINVAL;
737*8a204684SMing Yu 		goto free_ida;
738*8a204684SMing Yu 	}
739*8a204684SMing Yu 
740*8a204684SMing Yu 	ndev = alloc_candev(sizeof(struct nct6694_canfd_priv), 1);
741*8a204684SMing Yu 	if (!ndev) {
742*8a204684SMing Yu 		ret = -ENOMEM;
743*8a204684SMing Yu 		goto dispose_irq;
744*8a204684SMing Yu 	}
745*8a204684SMing Yu 
746*8a204684SMing Yu 	ndev->irq = irq;
747*8a204684SMing Yu 	ndev->flags |= IFF_ECHO;
748*8a204684SMing Yu 	ndev->dev_port = port;
749*8a204684SMing Yu 	ndev->netdev_ops = &nct6694_canfd_netdev_ops;
750*8a204684SMing Yu 	ndev->ethtool_ops = &nct6694_canfd_ethtool_ops;
751*8a204684SMing Yu 
752*8a204684SMing Yu 	priv = netdev_priv(ndev);
753*8a204684SMing Yu 	priv->nct6694 = nct6694;
754*8a204684SMing Yu 	priv->ndev = ndev;
755*8a204684SMing Yu 
756*8a204684SMing Yu 	can_clk = nct6694_canfd_get_clock(priv);
757*8a204684SMing Yu 	if (can_clk < 0) {
758*8a204684SMing Yu 		ret = dev_err_probe(&pdev->dev, can_clk,
759*8a204684SMing Yu 				    "Failed to get clock\n");
760*8a204684SMing Yu 		goto free_candev;
761*8a204684SMing Yu 	}
762*8a204684SMing Yu 
763*8a204684SMing Yu 	INIT_WORK(&priv->tx_work, nct6694_canfd_tx_work);
764*8a204684SMing Yu 
765*8a204684SMing Yu 	priv->can.clock.freq = can_clk;
766*8a204684SMing Yu 	priv->can.bittiming_const = &nct6694_canfd_bittiming_nominal_const;
767*8a204684SMing Yu 	priv->can.fd.data_bittiming_const = &nct6694_canfd_bittiming_data_const;
768*8a204684SMing Yu 	priv->can.do_set_mode = nct6694_canfd_set_mode;
769*8a204684SMing Yu 	priv->can.do_get_berr_counter = nct6694_canfd_get_berr_counter;
770*8a204684SMing Yu 	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
771*8a204684SMing Yu 		CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_BERR_REPORTING |
772*8a204684SMing Yu 		CAN_CTRLMODE_FD_NON_ISO;
773*8a204684SMing Yu 
774*8a204684SMing Yu 	ret = can_set_static_ctrlmode(ndev, CAN_CTRLMODE_FD);
775*8a204684SMing Yu 	if (ret)
776*8a204684SMing Yu 		goto free_candev;
777*8a204684SMing Yu 
778*8a204684SMing Yu 	ret = can_rx_offload_add_manual(ndev, &priv->offload,
779*8a204684SMing Yu 					NCT6694_NAPI_WEIGHT);
780*8a204684SMing Yu 	if (ret) {
781*8a204684SMing Yu 		dev_err_probe(&pdev->dev, ret, "Failed to add rx_offload\n");
782*8a204684SMing Yu 		goto free_candev;
783*8a204684SMing Yu 	}
784*8a204684SMing Yu 
785*8a204684SMing Yu 	platform_set_drvdata(pdev, priv);
786*8a204684SMing Yu 	SET_NETDEV_DEV(priv->ndev, &pdev->dev);
787*8a204684SMing Yu 
788*8a204684SMing Yu 	ret = register_candev(priv->ndev);
789*8a204684SMing Yu 	if (ret)
790*8a204684SMing Yu 		goto rx_offload_del;
791*8a204684SMing Yu 
792*8a204684SMing Yu 	return 0;
793*8a204684SMing Yu 
794*8a204684SMing Yu rx_offload_del:
795*8a204684SMing Yu 	can_rx_offload_del(&priv->offload);
796*8a204684SMing Yu free_candev:
797*8a204684SMing Yu 	free_candev(ndev);
798*8a204684SMing Yu dispose_irq:
799*8a204684SMing Yu 	irq_dispose_mapping(irq);
800*8a204684SMing Yu free_ida:
801*8a204684SMing Yu 	ida_free(&nct6694->canfd_ida, port);
802*8a204684SMing Yu 	return ret;
803*8a204684SMing Yu }
804*8a204684SMing Yu 
805*8a204684SMing Yu static void nct6694_canfd_remove(struct platform_device *pdev)
806*8a204684SMing Yu {
807*8a204684SMing Yu 	struct nct6694_canfd_priv *priv = platform_get_drvdata(pdev);
808*8a204684SMing Yu 	struct nct6694 *nct6694 = priv->nct6694;
809*8a204684SMing Yu 	struct net_device *ndev = priv->ndev;
810*8a204684SMing Yu 	int port = ndev->dev_port;
811*8a204684SMing Yu 	int irq = ndev->irq;
812*8a204684SMing Yu 
813*8a204684SMing Yu 	unregister_candev(ndev);
814*8a204684SMing Yu 	can_rx_offload_del(&priv->offload);
815*8a204684SMing Yu 	free_candev(ndev);
816*8a204684SMing Yu 	irq_dispose_mapping(irq);
817*8a204684SMing Yu 	ida_free(&nct6694->canfd_ida, port);
818*8a204684SMing Yu }
819*8a204684SMing Yu 
820*8a204684SMing Yu static struct platform_driver nct6694_canfd_driver = {
821*8a204684SMing Yu 	.driver = {
822*8a204684SMing Yu 		.name	= DEVICE_NAME,
823*8a204684SMing Yu 	},
824*8a204684SMing Yu 	.probe		= nct6694_canfd_probe,
825*8a204684SMing Yu 	.remove		= nct6694_canfd_remove,
826*8a204684SMing Yu };
827*8a204684SMing Yu 
828*8a204684SMing Yu module_platform_driver(nct6694_canfd_driver);
829*8a204684SMing Yu 
830*8a204684SMing Yu MODULE_DESCRIPTION("USB-CAN FD driver for NCT6694");
831*8a204684SMing Yu MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>");
832*8a204684SMing Yu MODULE_LICENSE("GPL");
833