1 /*
2 * CAN bus driver for IFI CANFD controller
3 *
4 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
5 *
6 * Details about this controller can be found at
7 * http://www.ifi-pld.de/IP/CANFD/canfd.html
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/ethtool.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/of.h>
23 #include <linux/platform_device.h>
24
25 #include <linux/can/dev.h>
26
27 #define IFI_CANFD_STCMD 0x0
28 #define IFI_CANFD_STCMD_HARDRESET 0xDEADCAFD
29 #define IFI_CANFD_STCMD_ENABLE BIT(0)
30 #define IFI_CANFD_STCMD_ERROR_ACTIVE BIT(2)
31 #define IFI_CANFD_STCMD_ERROR_PASSIVE BIT(3)
32 #define IFI_CANFD_STCMD_BUSOFF BIT(4)
33 #define IFI_CANFD_STCMD_ERROR_WARNING BIT(5)
34 #define IFI_CANFD_STCMD_BUSMONITOR BIT(16)
35 #define IFI_CANFD_STCMD_LOOPBACK BIT(18)
36 #define IFI_CANFD_STCMD_DISABLE_CANFD BIT(24)
37 #define IFI_CANFD_STCMD_ENABLE_ISO BIT(25)
38 #define IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING BIT(26)
39 #define IFI_CANFD_STCMD_NORMAL_MODE ((u32)BIT(31))
40
41 #define IFI_CANFD_RXSTCMD 0x4
42 #define IFI_CANFD_RXSTCMD_REMOVE_MSG BIT(0)
43 #define IFI_CANFD_RXSTCMD_RESET BIT(7)
44 #define IFI_CANFD_RXSTCMD_EMPTY BIT(8)
45 #define IFI_CANFD_RXSTCMD_OVERFLOW BIT(13)
46
47 #define IFI_CANFD_TXSTCMD 0x8
48 #define IFI_CANFD_TXSTCMD_ADD_MSG BIT(0)
49 #define IFI_CANFD_TXSTCMD_HIGH_PRIO BIT(1)
50 #define IFI_CANFD_TXSTCMD_RESET BIT(7)
51 #define IFI_CANFD_TXSTCMD_EMPTY BIT(8)
52 #define IFI_CANFD_TXSTCMD_FULL BIT(12)
53 #define IFI_CANFD_TXSTCMD_OVERFLOW BIT(13)
54
55 #define IFI_CANFD_INTERRUPT 0xc
56 #define IFI_CANFD_INTERRUPT_ERROR_BUSOFF BIT(0)
57 #define IFI_CANFD_INTERRUPT_ERROR_WARNING BIT(1)
58 #define IFI_CANFD_INTERRUPT_ERROR_STATE_CHG BIT(2)
59 #define IFI_CANFD_INTERRUPT_ERROR_REC_TEC_INC BIT(3)
60 #define IFI_CANFD_INTERRUPT_ERROR_COUNTER BIT(10)
61 #define IFI_CANFD_INTERRUPT_TXFIFO_EMPTY BIT(16)
62 #define IFI_CANFD_INTERRUPT_TXFIFO_REMOVE BIT(22)
63 #define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY BIT(24)
64 #define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER BIT(25)
65 #define IFI_CANFD_INTERRUPT_SET_IRQ ((u32)BIT(31))
66
67 #define IFI_CANFD_IRQMASK 0x10
68 #define IFI_CANFD_IRQMASK_ERROR_BUSOFF BIT(0)
69 #define IFI_CANFD_IRQMASK_ERROR_WARNING BIT(1)
70 #define IFI_CANFD_IRQMASK_ERROR_STATE_CHG BIT(2)
71 #define IFI_CANFD_IRQMASK_ERROR_REC_TEC_INC BIT(3)
72 #define IFI_CANFD_IRQMASK_SET_ERR BIT(7)
73 #define IFI_CANFD_IRQMASK_SET_TS BIT(15)
74 #define IFI_CANFD_IRQMASK_TXFIFO_EMPTY BIT(16)
75 #define IFI_CANFD_IRQMASK_SET_TX BIT(23)
76 #define IFI_CANFD_IRQMASK_RXFIFO_NEMPTY BIT(24)
77 #define IFI_CANFD_IRQMASK_SET_RX ((u32)BIT(31))
78
79 #define IFI_CANFD_TIME 0x14
80 #define IFI_CANFD_FTIME 0x18
81 #define IFI_CANFD_TIME_TIMEB_OFF 0
82 #define IFI_CANFD_TIME_TIMEA_OFF 8
83 #define IFI_CANFD_TIME_PRESCALE_OFF 16
84 #define IFI_CANFD_TIME_SJW_OFF_7_9_8_8 25
85 #define IFI_CANFD_TIME_SJW_OFF_4_12_6_6 28
86 #define IFI_CANFD_TIME_SET_SJW_4_12_6_6 BIT(6)
87 #define IFI_CANFD_TIME_SET_TIMEB_4_12_6_6 BIT(7)
88 #define IFI_CANFD_TIME_SET_PRESC_4_12_6_6 BIT(14)
89 #define IFI_CANFD_TIME_SET_TIMEA_4_12_6_6 BIT(15)
90
91 #define IFI_CANFD_TDELAY 0x1c
92 #define IFI_CANFD_TDELAY_DEFAULT 0xb
93 #define IFI_CANFD_TDELAY_MASK 0x3fff
94 #define IFI_CANFD_TDELAY_ABS BIT(14)
95 #define IFI_CANFD_TDELAY_EN BIT(15)
96
97 #define IFI_CANFD_ERROR 0x20
98 #define IFI_CANFD_ERROR_TX_OFFSET 0
99 #define IFI_CANFD_ERROR_TX_MASK 0xff
100 #define IFI_CANFD_ERROR_RX_OFFSET 16
101 #define IFI_CANFD_ERROR_RX_MASK 0xff
102
103 #define IFI_CANFD_ERRCNT 0x24
104
105 #define IFI_CANFD_SUSPEND 0x28
106
107 #define IFI_CANFD_REPEAT 0x2c
108
109 #define IFI_CANFD_TRAFFIC 0x30
110
111 #define IFI_CANFD_TSCONTROL 0x34
112
113 #define IFI_CANFD_TSC 0x38
114
115 #define IFI_CANFD_TST 0x3c
116
117 #define IFI_CANFD_RES1 0x40
118
119 #define IFI_CANFD_ERROR_CTR 0x44
120 #define IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC 0x21302899
121 #define IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST BIT(0)
122 #define IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST BIT(1)
123 #define IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST BIT(2)
124 #define IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST BIT(3)
125 #define IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST BIT(4)
126 #define IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST BIT(5)
127 #define IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST BIT(6)
128 #define IFI_CANFD_ERROR_CTR_OVERLOAD_ALL BIT(8)
129 #define IFI_CANFD_ERROR_CTR_ACK_ERROR_ALL BIT(9)
130 #define IFI_CANFD_ERROR_CTR_BIT0_ERROR_ALL BIT(10)
131 #define IFI_CANFD_ERROR_CTR_BIT1_ERROR_ALL BIT(11)
132 #define IFI_CANFD_ERROR_CTR_STUFF_ERROR_ALL BIT(12)
133 #define IFI_CANFD_ERROR_CTR_CRC_ERROR_ALL BIT(13)
134 #define IFI_CANFD_ERROR_CTR_FORM_ERROR_ALL BIT(14)
135 #define IFI_CANFD_ERROR_CTR_BITPOSITION_OFFSET 16
136 #define IFI_CANFD_ERROR_CTR_BITPOSITION_MASK 0xff
137 #define IFI_CANFD_ERROR_CTR_ER_RESET BIT(30)
138 #define IFI_CANFD_ERROR_CTR_ER_ENABLE ((u32)BIT(31))
139
140 #define IFI_CANFD_PAR 0x48
141
142 #define IFI_CANFD_CANCLOCK 0x4c
143
144 #define IFI_CANFD_SYSCLOCK 0x50
145
146 #define IFI_CANFD_VER 0x54
147 #define IFI_CANFD_VER_REV_MASK 0xff
148 #define IFI_CANFD_VER_REV_MIN_SUPPORTED 0x15
149
150 #define IFI_CANFD_IP_ID 0x58
151 #define IFI_CANFD_IP_ID_VALUE 0xD073CAFD
152
153 #define IFI_CANFD_TEST 0x5c
154
155 #define IFI_CANFD_RXFIFO_TS_63_32 0x60
156
157 #define IFI_CANFD_RXFIFO_TS_31_0 0x64
158
159 #define IFI_CANFD_RXFIFO_DLC 0x68
160 #define IFI_CANFD_RXFIFO_DLC_DLC_OFFSET 0
161 #define IFI_CANFD_RXFIFO_DLC_DLC_MASK 0xf
162 #define IFI_CANFD_RXFIFO_DLC_RTR BIT(4)
163 #define IFI_CANFD_RXFIFO_DLC_EDL BIT(5)
164 #define IFI_CANFD_RXFIFO_DLC_BRS BIT(6)
165 #define IFI_CANFD_RXFIFO_DLC_ESI BIT(7)
166 #define IFI_CANFD_RXFIFO_DLC_OBJ_OFFSET 8
167 #define IFI_CANFD_RXFIFO_DLC_OBJ_MASK 0x1ff
168 #define IFI_CANFD_RXFIFO_DLC_FNR_OFFSET 24
169 #define IFI_CANFD_RXFIFO_DLC_FNR_MASK 0xff
170
171 #define IFI_CANFD_RXFIFO_ID 0x6c
172 #define IFI_CANFD_RXFIFO_ID_ID_OFFSET 0
173 #define IFI_CANFD_RXFIFO_ID_ID_STD_MASK CAN_SFF_MASK
174 #define IFI_CANFD_RXFIFO_ID_ID_STD_OFFSET 0
175 #define IFI_CANFD_RXFIFO_ID_ID_STD_WIDTH 10
176 #define IFI_CANFD_RXFIFO_ID_ID_XTD_MASK CAN_EFF_MASK
177 #define IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET 11
178 #define IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH 18
179 #define IFI_CANFD_RXFIFO_ID_IDE BIT(29)
180
181 #define IFI_CANFD_RXFIFO_DATA 0x70 /* 0x70..0xac */
182
183 #define IFI_CANFD_TXFIFO_SUSPEND_US 0xb0
184
185 #define IFI_CANFD_TXFIFO_REPEATCOUNT 0xb4
186
187 #define IFI_CANFD_TXFIFO_DLC 0xb8
188 #define IFI_CANFD_TXFIFO_DLC_DLC_OFFSET 0
189 #define IFI_CANFD_TXFIFO_DLC_DLC_MASK 0xf
190 #define IFI_CANFD_TXFIFO_DLC_RTR BIT(4)
191 #define IFI_CANFD_TXFIFO_DLC_EDL BIT(5)
192 #define IFI_CANFD_TXFIFO_DLC_BRS BIT(6)
193 #define IFI_CANFD_TXFIFO_DLC_FNR_OFFSET 24
194 #define IFI_CANFD_TXFIFO_DLC_FNR_MASK 0xff
195
196 #define IFI_CANFD_TXFIFO_ID 0xbc
197 #define IFI_CANFD_TXFIFO_ID_ID_OFFSET 0
198 #define IFI_CANFD_TXFIFO_ID_ID_STD_MASK CAN_SFF_MASK
199 #define IFI_CANFD_TXFIFO_ID_ID_STD_OFFSET 0
200 #define IFI_CANFD_TXFIFO_ID_ID_STD_WIDTH 10
201 #define IFI_CANFD_TXFIFO_ID_ID_XTD_MASK CAN_EFF_MASK
202 #define IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET 11
203 #define IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH 18
204 #define IFI_CANFD_TXFIFO_ID_IDE BIT(29)
205
206 #define IFI_CANFD_TXFIFO_DATA 0xc0 /* 0xb0..0xfc */
207
208 #define IFI_CANFD_FILTER_MASK(n) (0x800 + ((n) * 8) + 0)
209 #define IFI_CANFD_FILTER_MASK_EXT BIT(29)
210 #define IFI_CANFD_FILTER_MASK_EDL BIT(30)
211 #define IFI_CANFD_FILTER_MASK_VALID ((u32)BIT(31))
212
213 #define IFI_CANFD_FILTER_IDENT(n) (0x800 + ((n) * 8) + 4)
214 #define IFI_CANFD_FILTER_IDENT_IDE BIT(29)
215 #define IFI_CANFD_FILTER_IDENT_CANFD BIT(30)
216 #define IFI_CANFD_FILTER_IDENT_VALID ((u32)BIT(31))
217
218 /* IFI CANFD private data structure */
219 struct ifi_canfd_priv {
220 struct can_priv can; /* must be the first member */
221 struct napi_struct napi;
222 struct net_device *ndev;
223 void __iomem *base;
224 };
225
ifi_canfd_irq_enable(struct net_device * ndev,bool enable)226 static void ifi_canfd_irq_enable(struct net_device *ndev, bool enable)
227 {
228 struct ifi_canfd_priv *priv = netdev_priv(ndev);
229 u32 enirq = 0;
230
231 if (enable) {
232 enirq = IFI_CANFD_IRQMASK_TXFIFO_EMPTY |
233 IFI_CANFD_IRQMASK_RXFIFO_NEMPTY |
234 IFI_CANFD_IRQMASK_ERROR_STATE_CHG |
235 IFI_CANFD_IRQMASK_ERROR_WARNING |
236 IFI_CANFD_IRQMASK_ERROR_BUSOFF;
237 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
238 enirq |= IFI_CANFD_INTERRUPT_ERROR_COUNTER;
239 }
240
241 writel(IFI_CANFD_IRQMASK_SET_ERR |
242 IFI_CANFD_IRQMASK_SET_TS |
243 IFI_CANFD_IRQMASK_SET_TX |
244 IFI_CANFD_IRQMASK_SET_RX | enirq,
245 priv->base + IFI_CANFD_IRQMASK);
246 }
247
ifi_canfd_read_fifo(struct net_device * ndev)248 static void ifi_canfd_read_fifo(struct net_device *ndev)
249 {
250 struct net_device_stats *stats = &ndev->stats;
251 struct ifi_canfd_priv *priv = netdev_priv(ndev);
252 struct canfd_frame *cf;
253 struct sk_buff *skb;
254 const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY |
255 IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER;
256 u32 rxdlc, rxid;
257 u32 dlc, id;
258 int i;
259
260 rxdlc = readl(priv->base + IFI_CANFD_RXFIFO_DLC);
261 if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
262 skb = alloc_canfd_skb(ndev, &cf);
263 else
264 skb = alloc_can_skb(ndev, (struct can_frame **)&cf);
265
266 if (!skb) {
267 stats->rx_dropped++;
268 return;
269 }
270
271 dlc = (rxdlc >> IFI_CANFD_RXFIFO_DLC_DLC_OFFSET) &
272 IFI_CANFD_RXFIFO_DLC_DLC_MASK;
273 if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
274 cf->len = can_fd_dlc2len(dlc);
275 else
276 cf->len = can_cc_dlc2len(dlc);
277
278 rxid = readl(priv->base + IFI_CANFD_RXFIFO_ID);
279 id = (rxid >> IFI_CANFD_RXFIFO_ID_ID_OFFSET);
280 if (id & IFI_CANFD_RXFIFO_ID_IDE) {
281 id &= IFI_CANFD_RXFIFO_ID_ID_XTD_MASK;
282 /*
283 * In case the Extended ID frame is received, the standard
284 * and extended part of the ID are swapped in the register,
285 * so swap them back to obtain the correct ID.
286 */
287 id = (id >> IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET) |
288 ((id & IFI_CANFD_RXFIFO_ID_ID_STD_MASK) <<
289 IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH);
290 id |= CAN_EFF_FLAG;
291 } else {
292 id &= IFI_CANFD_RXFIFO_ID_ID_STD_MASK;
293 }
294 cf->can_id = id;
295
296 if (rxdlc & IFI_CANFD_RXFIFO_DLC_ESI) {
297 cf->flags |= CANFD_ESI;
298 netdev_dbg(ndev, "ESI Error\n");
299 }
300
301 if (!(rxdlc & IFI_CANFD_RXFIFO_DLC_EDL) &&
302 (rxdlc & IFI_CANFD_RXFIFO_DLC_RTR)) {
303 cf->can_id |= CAN_RTR_FLAG;
304 } else {
305 if (rxdlc & IFI_CANFD_RXFIFO_DLC_BRS)
306 cf->flags |= CANFD_BRS;
307
308 for (i = 0; i < cf->len; i += 4) {
309 *(u32 *)(cf->data + i) =
310 readl(priv->base + IFI_CANFD_RXFIFO_DATA + i);
311 }
312
313 stats->rx_bytes += cf->len;
314 }
315 stats->rx_packets++;
316
317 /* Remove the packet from FIFO */
318 writel(IFI_CANFD_RXSTCMD_REMOVE_MSG, priv->base + IFI_CANFD_RXSTCMD);
319 writel(rx_irq_mask, priv->base + IFI_CANFD_INTERRUPT);
320
321 netif_receive_skb(skb);
322 }
323
ifi_canfd_do_rx_poll(struct net_device * ndev,int quota)324 static int ifi_canfd_do_rx_poll(struct net_device *ndev, int quota)
325 {
326 struct ifi_canfd_priv *priv = netdev_priv(ndev);
327 u32 pkts = 0;
328 u32 rxst;
329
330 rxst = readl(priv->base + IFI_CANFD_RXSTCMD);
331 if (rxst & IFI_CANFD_RXSTCMD_EMPTY) {
332 netdev_dbg(ndev, "No messages in RX FIFO\n");
333 return 0;
334 }
335
336 for (;;) {
337 if (rxst & IFI_CANFD_RXSTCMD_EMPTY)
338 break;
339 if (quota <= 0)
340 break;
341
342 ifi_canfd_read_fifo(ndev);
343 quota--;
344 pkts++;
345 rxst = readl(priv->base + IFI_CANFD_RXSTCMD);
346 }
347
348 return pkts;
349 }
350
ifi_canfd_handle_lost_msg(struct net_device * ndev)351 static int ifi_canfd_handle_lost_msg(struct net_device *ndev)
352 {
353 struct net_device_stats *stats = &ndev->stats;
354 struct sk_buff *skb;
355 struct can_frame *frame;
356
357 netdev_err(ndev, "RX FIFO overflow, message(s) lost.\n");
358
359 stats->rx_errors++;
360 stats->rx_over_errors++;
361
362 skb = alloc_can_err_skb(ndev, &frame);
363 if (unlikely(!skb))
364 return 0;
365
366 frame->can_id |= CAN_ERR_CRTL;
367 frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
368
369 netif_receive_skb(skb);
370
371 return 1;
372 }
373
ifi_canfd_handle_lec_err(struct net_device * ndev)374 static int ifi_canfd_handle_lec_err(struct net_device *ndev)
375 {
376 struct ifi_canfd_priv *priv = netdev_priv(ndev);
377 struct net_device_stats *stats = &ndev->stats;
378 struct can_frame *cf;
379 struct sk_buff *skb;
380 u32 errctr = readl(priv->base + IFI_CANFD_ERROR_CTR);
381 const u32 errmask = IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST |
382 IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST |
383 IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST |
384 IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST |
385 IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST |
386 IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST |
387 IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST;
388
389 if (!(errctr & errmask)) /* No error happened. */
390 return 0;
391
392 priv->can.can_stats.bus_error++;
393 stats->rx_errors++;
394
395 /* Propagate the error condition to the CAN stack. */
396 skb = alloc_can_err_skb(ndev, &cf);
397 if (unlikely(!skb))
398 return 0;
399
400 /* Read the error counter register and check for new errors. */
401 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
402
403 if (errctr & IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST)
404 cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
405
406 if (errctr & IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST)
407 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
408
409 if (errctr & IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST)
410 cf->data[2] |= CAN_ERR_PROT_BIT0;
411
412 if (errctr & IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST)
413 cf->data[2] |= CAN_ERR_PROT_BIT1;
414
415 if (errctr & IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST)
416 cf->data[2] |= CAN_ERR_PROT_STUFF;
417
418 if (errctr & IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST)
419 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
420
421 if (errctr & IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST)
422 cf->data[2] |= CAN_ERR_PROT_FORM;
423
424 /* Reset the error counter, ack the IRQ and re-enable the counter. */
425 writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
426 writel(IFI_CANFD_INTERRUPT_ERROR_COUNTER,
427 priv->base + IFI_CANFD_INTERRUPT);
428 writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
429
430 netif_receive_skb(skb);
431
432 return 1;
433 }
434
ifi_canfd_get_berr_counter(const struct net_device * ndev,struct can_berr_counter * bec)435 static int ifi_canfd_get_berr_counter(const struct net_device *ndev,
436 struct can_berr_counter *bec)
437 {
438 struct ifi_canfd_priv *priv = netdev_priv(ndev);
439 u32 err;
440
441 err = readl(priv->base + IFI_CANFD_ERROR);
442 bec->rxerr = (err >> IFI_CANFD_ERROR_RX_OFFSET) &
443 IFI_CANFD_ERROR_RX_MASK;
444 bec->txerr = (err >> IFI_CANFD_ERROR_TX_OFFSET) &
445 IFI_CANFD_ERROR_TX_MASK;
446
447 return 0;
448 }
449
ifi_canfd_handle_state_change(struct net_device * ndev,enum can_state new_state)450 static int ifi_canfd_handle_state_change(struct net_device *ndev,
451 enum can_state new_state)
452 {
453 struct ifi_canfd_priv *priv = netdev_priv(ndev);
454 struct can_frame *cf;
455 struct sk_buff *skb;
456 struct can_berr_counter bec;
457
458 switch (new_state) {
459 case CAN_STATE_ERROR_ACTIVE:
460 /* error active state */
461 priv->can.can_stats.error_warning++;
462 priv->can.state = CAN_STATE_ERROR_ACTIVE;
463 break;
464 case CAN_STATE_ERROR_WARNING:
465 /* error warning state */
466 priv->can.can_stats.error_warning++;
467 priv->can.state = CAN_STATE_ERROR_WARNING;
468 break;
469 case CAN_STATE_ERROR_PASSIVE:
470 /* error passive state */
471 priv->can.can_stats.error_passive++;
472 priv->can.state = CAN_STATE_ERROR_PASSIVE;
473 break;
474 case CAN_STATE_BUS_OFF:
475 /* bus-off state */
476 priv->can.state = CAN_STATE_BUS_OFF;
477 ifi_canfd_irq_enable(ndev, 0);
478 priv->can.can_stats.bus_off++;
479 can_bus_off(ndev);
480 break;
481 default:
482 break;
483 }
484
485 /* propagate the error condition to the CAN stack */
486 skb = alloc_can_err_skb(ndev, &cf);
487 if (unlikely(!skb))
488 return 0;
489
490 ifi_canfd_get_berr_counter(ndev, &bec);
491
492 switch (new_state) {
493 case CAN_STATE_ERROR_WARNING:
494 /* error warning state */
495 cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
496 cf->data[1] = (bec.txerr > bec.rxerr) ?
497 CAN_ERR_CRTL_TX_WARNING :
498 CAN_ERR_CRTL_RX_WARNING;
499 cf->data[6] = bec.txerr;
500 cf->data[7] = bec.rxerr;
501 break;
502 case CAN_STATE_ERROR_PASSIVE:
503 /* error passive state */
504 cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
505 cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
506 if (bec.txerr > 127)
507 cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
508 cf->data[6] = bec.txerr;
509 cf->data[7] = bec.rxerr;
510 break;
511 case CAN_STATE_BUS_OFF:
512 /* bus-off state */
513 cf->can_id |= CAN_ERR_BUSOFF;
514 break;
515 default:
516 break;
517 }
518
519 netif_receive_skb(skb);
520
521 return 1;
522 }
523
ifi_canfd_handle_state_errors(struct net_device * ndev)524 static int ifi_canfd_handle_state_errors(struct net_device *ndev)
525 {
526 struct ifi_canfd_priv *priv = netdev_priv(ndev);
527 u32 stcmd = readl(priv->base + IFI_CANFD_STCMD);
528 int work_done = 0;
529
530 if ((stcmd & IFI_CANFD_STCMD_ERROR_ACTIVE) &&
531 (priv->can.state != CAN_STATE_ERROR_ACTIVE)) {
532 netdev_dbg(ndev, "Error, entered active state\n");
533 work_done += ifi_canfd_handle_state_change(ndev,
534 CAN_STATE_ERROR_ACTIVE);
535 }
536
537 if ((stcmd & IFI_CANFD_STCMD_ERROR_WARNING) &&
538 (priv->can.state != CAN_STATE_ERROR_WARNING)) {
539 netdev_dbg(ndev, "Error, entered warning state\n");
540 work_done += ifi_canfd_handle_state_change(ndev,
541 CAN_STATE_ERROR_WARNING);
542 }
543
544 if ((stcmd & IFI_CANFD_STCMD_ERROR_PASSIVE) &&
545 (priv->can.state != CAN_STATE_ERROR_PASSIVE)) {
546 netdev_dbg(ndev, "Error, entered passive state\n");
547 work_done += ifi_canfd_handle_state_change(ndev,
548 CAN_STATE_ERROR_PASSIVE);
549 }
550
551 if ((stcmd & IFI_CANFD_STCMD_BUSOFF) &&
552 (priv->can.state != CAN_STATE_BUS_OFF)) {
553 netdev_dbg(ndev, "Error, entered bus-off state\n");
554 work_done += ifi_canfd_handle_state_change(ndev,
555 CAN_STATE_BUS_OFF);
556 }
557
558 return work_done;
559 }
560
ifi_canfd_poll(struct napi_struct * napi,int quota)561 static int ifi_canfd_poll(struct napi_struct *napi, int quota)
562 {
563 struct net_device *ndev = napi->dev;
564 struct ifi_canfd_priv *priv = netdev_priv(ndev);
565 u32 rxstcmd = readl(priv->base + IFI_CANFD_RXSTCMD);
566 int work_done = 0;
567
568 /* Handle bus state changes */
569 work_done += ifi_canfd_handle_state_errors(ndev);
570
571 /* Handle lost messages on RX */
572 if (rxstcmd & IFI_CANFD_RXSTCMD_OVERFLOW)
573 work_done += ifi_canfd_handle_lost_msg(ndev);
574
575 /* Handle lec errors on the bus */
576 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
577 work_done += ifi_canfd_handle_lec_err(ndev);
578
579 /* Handle normal messages on RX */
580 if (!(rxstcmd & IFI_CANFD_RXSTCMD_EMPTY))
581 work_done += ifi_canfd_do_rx_poll(ndev, quota - work_done);
582
583 if (work_done < quota) {
584 napi_complete_done(napi, work_done);
585 ifi_canfd_irq_enable(ndev, 1);
586 }
587
588 return work_done;
589 }
590
ifi_canfd_isr(int irq,void * dev_id)591 static irqreturn_t ifi_canfd_isr(int irq, void *dev_id)
592 {
593 struct net_device *ndev = (struct net_device *)dev_id;
594 struct ifi_canfd_priv *priv = netdev_priv(ndev);
595 struct net_device_stats *stats = &ndev->stats;
596 const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY |
597 IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER |
598 IFI_CANFD_INTERRUPT_ERROR_COUNTER |
599 IFI_CANFD_INTERRUPT_ERROR_STATE_CHG |
600 IFI_CANFD_INTERRUPT_ERROR_WARNING |
601 IFI_CANFD_INTERRUPT_ERROR_BUSOFF;
602 const u32 tx_irq_mask = IFI_CANFD_INTERRUPT_TXFIFO_EMPTY |
603 IFI_CANFD_INTERRUPT_TXFIFO_REMOVE;
604 const u32 clr_irq_mask = ~((u32)IFI_CANFD_INTERRUPT_SET_IRQ);
605 u32 isr;
606
607 isr = readl(priv->base + IFI_CANFD_INTERRUPT);
608
609 /* No interrupt */
610 if (isr == 0)
611 return IRQ_NONE;
612
613 /* Clear all pending interrupts but ErrWarn */
614 writel(clr_irq_mask, priv->base + IFI_CANFD_INTERRUPT);
615
616 /* RX IRQ or bus warning, start NAPI */
617 if (isr & rx_irq_mask) {
618 ifi_canfd_irq_enable(ndev, 0);
619 napi_schedule(&priv->napi);
620 }
621
622 /* TX IRQ */
623 if (isr & IFI_CANFD_INTERRUPT_TXFIFO_REMOVE) {
624 stats->tx_bytes += can_get_echo_skb(ndev, 0, NULL);
625 stats->tx_packets++;
626 }
627
628 if (isr & tx_irq_mask)
629 netif_wake_queue(ndev);
630
631 return IRQ_HANDLED;
632 }
633
634 static const struct can_bittiming_const ifi_canfd_bittiming_const = {
635 .name = KBUILD_MODNAME,
636 .tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */
637 .tseg1_max = 256,
638 .tseg2_min = 2, /* Time segment 2 = phase_seg2 */
639 .tseg2_max = 256,
640 .sjw_max = 128,
641 .brp_min = 2,
642 .brp_max = 512,
643 .brp_inc = 1,
644 };
645
ifi_canfd_set_bittiming(struct net_device * ndev)646 static void ifi_canfd_set_bittiming(struct net_device *ndev)
647 {
648 struct ifi_canfd_priv *priv = netdev_priv(ndev);
649 const struct can_bittiming *bt = &priv->can.bittiming;
650 const struct can_bittiming *dbt = &priv->can.data_bittiming;
651 u16 brp, sjw, tseg1, tseg2, tdc;
652
653 /* Configure bit timing */
654 brp = bt->brp - 2;
655 sjw = bt->sjw - 1;
656 tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
657 tseg2 = bt->phase_seg2 - 2;
658 writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
659 (tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
660 (brp << IFI_CANFD_TIME_PRESCALE_OFF) |
661 (sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
662 priv->base + IFI_CANFD_TIME);
663
664 /* Configure data bit timing */
665 brp = dbt->brp - 2;
666 sjw = dbt->sjw - 1;
667 tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
668 tseg2 = dbt->phase_seg2 - 2;
669 writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
670 (tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
671 (brp << IFI_CANFD_TIME_PRESCALE_OFF) |
672 (sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
673 priv->base + IFI_CANFD_FTIME);
674
675 /* Configure transmitter delay */
676 tdc = dbt->brp * (dbt->prop_seg + dbt->phase_seg1);
677 tdc &= IFI_CANFD_TDELAY_MASK;
678 writel(IFI_CANFD_TDELAY_EN | tdc, priv->base + IFI_CANFD_TDELAY);
679 }
680
ifi_canfd_set_filter(struct net_device * ndev,const u32 id,const u32 mask,const u32 ident)681 static void ifi_canfd_set_filter(struct net_device *ndev, const u32 id,
682 const u32 mask, const u32 ident)
683 {
684 struct ifi_canfd_priv *priv = netdev_priv(ndev);
685
686 writel(mask, priv->base + IFI_CANFD_FILTER_MASK(id));
687 writel(ident, priv->base + IFI_CANFD_FILTER_IDENT(id));
688 }
689
ifi_canfd_set_filters(struct net_device * ndev)690 static void ifi_canfd_set_filters(struct net_device *ndev)
691 {
692 /* Receive all CAN frames (standard ID) */
693 ifi_canfd_set_filter(ndev, 0,
694 IFI_CANFD_FILTER_MASK_VALID |
695 IFI_CANFD_FILTER_MASK_EXT,
696 IFI_CANFD_FILTER_IDENT_VALID);
697
698 /* Receive all CAN frames (extended ID) */
699 ifi_canfd_set_filter(ndev, 1,
700 IFI_CANFD_FILTER_MASK_VALID |
701 IFI_CANFD_FILTER_MASK_EXT,
702 IFI_CANFD_FILTER_IDENT_VALID |
703 IFI_CANFD_FILTER_IDENT_IDE);
704
705 /* Receive all CANFD frames */
706 ifi_canfd_set_filter(ndev, 2,
707 IFI_CANFD_FILTER_MASK_VALID |
708 IFI_CANFD_FILTER_MASK_EDL |
709 IFI_CANFD_FILTER_MASK_EXT,
710 IFI_CANFD_FILTER_IDENT_VALID |
711 IFI_CANFD_FILTER_IDENT_CANFD |
712 IFI_CANFD_FILTER_IDENT_IDE);
713 }
714
ifi_canfd_start(struct net_device * ndev)715 static void ifi_canfd_start(struct net_device *ndev)
716 {
717 struct ifi_canfd_priv *priv = netdev_priv(ndev);
718 u32 stcmd;
719
720 /* Reset the IP */
721 writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);
722 writel(IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING,
723 priv->base + IFI_CANFD_STCMD);
724
725 ifi_canfd_set_bittiming(ndev);
726 ifi_canfd_set_filters(ndev);
727
728 /* Reset FIFOs */
729 writel(IFI_CANFD_RXSTCMD_RESET, priv->base + IFI_CANFD_RXSTCMD);
730 writel(0, priv->base + IFI_CANFD_RXSTCMD);
731 writel(IFI_CANFD_TXSTCMD_RESET, priv->base + IFI_CANFD_TXSTCMD);
732 writel(0, priv->base + IFI_CANFD_TXSTCMD);
733
734 /* Repeat transmission until successful */
735 writel(0, priv->base + IFI_CANFD_REPEAT);
736 writel(0, priv->base + IFI_CANFD_SUSPEND);
737
738 /* Clear all pending interrupts */
739 writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
740 priv->base + IFI_CANFD_INTERRUPT);
741
742 stcmd = IFI_CANFD_STCMD_ENABLE | IFI_CANFD_STCMD_NORMAL_MODE |
743 IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING;
744
745 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
746 stcmd |= IFI_CANFD_STCMD_BUSMONITOR;
747
748 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
749 stcmd |= IFI_CANFD_STCMD_LOOPBACK;
750
751 if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
752 !(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO))
753 stcmd |= IFI_CANFD_STCMD_ENABLE_ISO;
754
755 if (!(priv->can.ctrlmode & CAN_CTRLMODE_FD))
756 stcmd |= IFI_CANFD_STCMD_DISABLE_CANFD;
757
758 priv->can.state = CAN_STATE_ERROR_ACTIVE;
759
760 ifi_canfd_irq_enable(ndev, 1);
761
762 /* Unlock, reset and enable the error counter. */
763 writel(IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC,
764 priv->base + IFI_CANFD_ERROR_CTR);
765 writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
766 writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
767
768 /* Enable controller */
769 writel(stcmd, priv->base + IFI_CANFD_STCMD);
770 }
771
ifi_canfd_stop(struct net_device * ndev)772 static void ifi_canfd_stop(struct net_device *ndev)
773 {
774 struct ifi_canfd_priv *priv = netdev_priv(ndev);
775
776 /* Reset and disable the error counter. */
777 writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
778 writel(0, priv->base + IFI_CANFD_ERROR_CTR);
779
780 /* Reset the IP */
781 writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);
782
783 /* Mask all interrupts */
784 writel(~0, priv->base + IFI_CANFD_IRQMASK);
785
786 /* Clear all pending interrupts */
787 writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
788 priv->base + IFI_CANFD_INTERRUPT);
789
790 /* Set the state as STOPPED */
791 priv->can.state = CAN_STATE_STOPPED;
792 }
793
ifi_canfd_set_mode(struct net_device * ndev,enum can_mode mode)794 static int ifi_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
795 {
796 switch (mode) {
797 case CAN_MODE_START:
798 ifi_canfd_start(ndev);
799 netif_wake_queue(ndev);
800 break;
801 default:
802 return -EOPNOTSUPP;
803 }
804
805 return 0;
806 }
807
ifi_canfd_open(struct net_device * ndev)808 static int ifi_canfd_open(struct net_device *ndev)
809 {
810 struct ifi_canfd_priv *priv = netdev_priv(ndev);
811 int ret;
812
813 ret = open_candev(ndev);
814 if (ret) {
815 netdev_err(ndev, "Failed to open CAN device\n");
816 return ret;
817 }
818
819 /* Register interrupt handler */
820 ret = request_irq(ndev->irq, ifi_canfd_isr, IRQF_SHARED,
821 ndev->name, ndev);
822 if (ret < 0) {
823 netdev_err(ndev, "Failed to request interrupt\n");
824 goto err_irq;
825 }
826
827 ifi_canfd_start(ndev);
828
829 napi_enable(&priv->napi);
830 netif_start_queue(ndev);
831
832 return 0;
833 err_irq:
834 close_candev(ndev);
835 return ret;
836 }
837
ifi_canfd_close(struct net_device * ndev)838 static int ifi_canfd_close(struct net_device *ndev)
839 {
840 struct ifi_canfd_priv *priv = netdev_priv(ndev);
841
842 netif_stop_queue(ndev);
843 napi_disable(&priv->napi);
844
845 ifi_canfd_stop(ndev);
846
847 free_irq(ndev->irq, ndev);
848
849 close_candev(ndev);
850
851 return 0;
852 }
853
ifi_canfd_start_xmit(struct sk_buff * skb,struct net_device * ndev)854 static netdev_tx_t ifi_canfd_start_xmit(struct sk_buff *skb,
855 struct net_device *ndev)
856 {
857 struct ifi_canfd_priv *priv = netdev_priv(ndev);
858 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
859 u32 txst, txid, txdlc;
860 int i;
861
862 if (can_dev_dropped_skb(ndev, skb))
863 return NETDEV_TX_OK;
864
865 /* Check if the TX buffer is full */
866 txst = readl(priv->base + IFI_CANFD_TXSTCMD);
867 if (txst & IFI_CANFD_TXSTCMD_FULL) {
868 netif_stop_queue(ndev);
869 netdev_err(ndev, "BUG! TX FIFO full when queue awake!\n");
870 return NETDEV_TX_BUSY;
871 }
872
873 netif_stop_queue(ndev);
874
875 if (cf->can_id & CAN_EFF_FLAG) {
876 txid = cf->can_id & CAN_EFF_MASK;
877 /*
878 * In case the Extended ID frame is transmitted, the
879 * standard and extended part of the ID are swapped
880 * in the register, so swap them back to send the
881 * correct ID.
882 */
883 txid = (txid >> IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH) |
884 ((txid & IFI_CANFD_TXFIFO_ID_ID_XTD_MASK) <<
885 IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET);
886 txid |= IFI_CANFD_TXFIFO_ID_IDE;
887 } else {
888 txid = cf->can_id & CAN_SFF_MASK;
889 }
890
891 txdlc = can_fd_len2dlc(cf->len);
892 if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) && can_is_canfd_skb(skb)) {
893 txdlc |= IFI_CANFD_TXFIFO_DLC_EDL;
894 if (cf->flags & CANFD_BRS)
895 txdlc |= IFI_CANFD_TXFIFO_DLC_BRS;
896 }
897
898 if (cf->can_id & CAN_RTR_FLAG)
899 txdlc |= IFI_CANFD_TXFIFO_DLC_RTR;
900
901 /* message ram configuration */
902 writel(txid, priv->base + IFI_CANFD_TXFIFO_ID);
903 writel(txdlc, priv->base + IFI_CANFD_TXFIFO_DLC);
904
905 for (i = 0; i < cf->len; i += 4) {
906 writel(*(u32 *)(cf->data + i),
907 priv->base + IFI_CANFD_TXFIFO_DATA + i);
908 }
909
910 writel(0, priv->base + IFI_CANFD_TXFIFO_REPEATCOUNT);
911 writel(0, priv->base + IFI_CANFD_TXFIFO_SUSPEND_US);
912
913 can_put_echo_skb(skb, ndev, 0, 0);
914
915 /* Start the transmission */
916 writel(IFI_CANFD_TXSTCMD_ADD_MSG, priv->base + IFI_CANFD_TXSTCMD);
917
918 return NETDEV_TX_OK;
919 }
920
921 static const struct net_device_ops ifi_canfd_netdev_ops = {
922 .ndo_open = ifi_canfd_open,
923 .ndo_stop = ifi_canfd_close,
924 .ndo_start_xmit = ifi_canfd_start_xmit,
925 .ndo_change_mtu = can_change_mtu,
926 };
927
928 static const struct ethtool_ops ifi_canfd_ethtool_ops = {
929 .get_ts_info = ethtool_op_get_ts_info,
930 };
931
ifi_canfd_plat_probe(struct platform_device * pdev)932 static int ifi_canfd_plat_probe(struct platform_device *pdev)
933 {
934 struct device *dev = &pdev->dev;
935 struct net_device *ndev;
936 struct ifi_canfd_priv *priv;
937 void __iomem *addr;
938 int irq, ret;
939 u32 id, rev;
940
941 addr = devm_platform_ioremap_resource(pdev, 0);
942 if (IS_ERR(addr))
943 return PTR_ERR(addr);
944
945 irq = platform_get_irq(pdev, 0);
946 if (irq < 0)
947 return -EINVAL;
948
949 id = readl(addr + IFI_CANFD_IP_ID);
950 if (id != IFI_CANFD_IP_ID_VALUE) {
951 dev_err(dev, "This block is not IFI CANFD, id=%08x\n", id);
952 return -EINVAL;
953 }
954
955 rev = readl(addr + IFI_CANFD_VER) & IFI_CANFD_VER_REV_MASK;
956 if (rev < IFI_CANFD_VER_REV_MIN_SUPPORTED) {
957 dev_err(dev, "This block is too old (rev %i), minimum supported is rev %i\n",
958 rev, IFI_CANFD_VER_REV_MIN_SUPPORTED);
959 return -EINVAL;
960 }
961
962 ndev = alloc_candev(sizeof(*priv), 1);
963 if (!ndev)
964 return -ENOMEM;
965
966 ndev->irq = irq;
967 ndev->flags |= IFF_ECHO; /* we support local echo */
968 ndev->netdev_ops = &ifi_canfd_netdev_ops;
969 ndev->ethtool_ops = &ifi_canfd_ethtool_ops;
970
971 priv = netdev_priv(ndev);
972 priv->ndev = ndev;
973 priv->base = addr;
974
975 netif_napi_add(ndev, &priv->napi, ifi_canfd_poll);
976
977 priv->can.state = CAN_STATE_STOPPED;
978
979 priv->can.clock.freq = readl(addr + IFI_CANFD_CANCLOCK);
980
981 priv->can.bittiming_const = &ifi_canfd_bittiming_const;
982 priv->can.data_bittiming_const = &ifi_canfd_bittiming_const;
983 priv->can.do_set_mode = ifi_canfd_set_mode;
984 priv->can.do_get_berr_counter = ifi_canfd_get_berr_counter;
985
986 /* IFI CANFD can do both Bosch FD and ISO FD */
987 priv->can.ctrlmode = CAN_CTRLMODE_FD;
988
989 /* IFI CANFD can do both Bosch FD and ISO FD */
990 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
991 CAN_CTRLMODE_LISTENONLY |
992 CAN_CTRLMODE_FD |
993 CAN_CTRLMODE_FD_NON_ISO |
994 CAN_CTRLMODE_BERR_REPORTING;
995
996 platform_set_drvdata(pdev, ndev);
997 SET_NETDEV_DEV(ndev, dev);
998
999 ret = register_candev(ndev);
1000 if (ret) {
1001 dev_err(dev, "Failed to register (ret=%d)\n", ret);
1002 goto err_reg;
1003 }
1004
1005 dev_info(dev, "Driver registered: regs=%p, irq=%d, clock=%d\n",
1006 priv->base, ndev->irq, priv->can.clock.freq);
1007
1008 return 0;
1009
1010 err_reg:
1011 free_candev(ndev);
1012 return ret;
1013 }
1014
ifi_canfd_plat_remove(struct platform_device * pdev)1015 static void ifi_canfd_plat_remove(struct platform_device *pdev)
1016 {
1017 struct net_device *ndev = platform_get_drvdata(pdev);
1018
1019 unregister_candev(ndev);
1020 platform_set_drvdata(pdev, NULL);
1021 free_candev(ndev);
1022 }
1023
1024 static const struct of_device_id ifi_canfd_of_table[] = {
1025 { .compatible = "ifi,canfd-1.0", .data = NULL },
1026 { /* sentinel */ },
1027 };
1028 MODULE_DEVICE_TABLE(of, ifi_canfd_of_table);
1029
1030 static struct platform_driver ifi_canfd_plat_driver = {
1031 .driver = {
1032 .name = KBUILD_MODNAME,
1033 .of_match_table = ifi_canfd_of_table,
1034 },
1035 .probe = ifi_canfd_plat_probe,
1036 .remove = ifi_canfd_plat_remove,
1037 };
1038
1039 module_platform_driver(ifi_canfd_plat_driver);
1040
1041 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
1042 MODULE_LICENSE("GPL v2");
1043 MODULE_DESCRIPTION("CAN bus driver for IFI CANFD controller");
1044