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631eb227 IS |
1 | /* |
2 | * Janz MODULbus VMOD-ICAN3 CAN Interface Driver | |
3 | * | |
4 | * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
631eb227 IS |
14 | #include <linux/interrupt.h> |
15 | #include <linux/delay.h> | |
16 | #include <linux/platform_device.h> | |
17 | ||
18 | #include <linux/netdevice.h> | |
19 | #include <linux/can.h> | |
20 | #include <linux/can/dev.h> | |
0ae89beb | 21 | #include <linux/can/skb.h> |
631eb227 IS |
22 | #include <linux/can/error.h> |
23 | ||
24 | #include <linux/mfd/janz.h> | |
b7f080cf | 25 | #include <asm/io.h> |
631eb227 IS |
26 | |
27 | /* the DPM has 64k of memory, organized into 256x 256 byte pages */ | |
28 | #define DPM_NUM_PAGES 256 | |
29 | #define DPM_PAGE_SIZE 256 | |
30 | #define DPM_PAGE_ADDR(p) ((p) * DPM_PAGE_SIZE) | |
31 | ||
32 | /* JANZ ICAN3 "old-style" host interface queue page numbers */ | |
33 | #define QUEUE_OLD_CONTROL 0 | |
34 | #define QUEUE_OLD_RB0 1 | |
35 | #define QUEUE_OLD_RB1 2 | |
36 | #define QUEUE_OLD_WB0 3 | |
37 | #define QUEUE_OLD_WB1 4 | |
38 | ||
39 | /* Janz ICAN3 "old-style" host interface control registers */ | |
40 | #define MSYNC_PEER 0x00 /* ICAN only */ | |
41 | #define MSYNC_LOCL 0x01 /* host only */ | |
42 | #define TARGET_RUNNING 0x02 | |
844e0edf | 43 | #define FIRMWARE_STAMP 0x60 /* big endian firmware stamp */ |
631eb227 IS |
44 | |
45 | #define MSYNC_RB0 0x01 | |
46 | #define MSYNC_RB1 0x02 | |
47 | #define MSYNC_RBLW 0x04 | |
48 | #define MSYNC_RB_MASK (MSYNC_RB0 | MSYNC_RB1) | |
49 | ||
50 | #define MSYNC_WB0 0x10 | |
51 | #define MSYNC_WB1 0x20 | |
52 | #define MSYNC_WBLW 0x40 | |
53 | #define MSYNC_WB_MASK (MSYNC_WB0 | MSYNC_WB1) | |
54 | ||
55 | /* Janz ICAN3 "new-style" host interface queue page numbers */ | |
56 | #define QUEUE_TOHOST 5 | |
57 | #define QUEUE_FROMHOST_MID 6 | |
58 | #define QUEUE_FROMHOST_HIGH 7 | |
59 | #define QUEUE_FROMHOST_LOW 8 | |
60 | ||
61 | /* The first free page in the DPM is #9 */ | |
62 | #define DPM_FREE_START 9 | |
63 | ||
64 | /* Janz ICAN3 "new-style" and "fast" host interface descriptor flags */ | |
65 | #define DESC_VALID 0x80 | |
66 | #define DESC_WRAP 0x40 | |
67 | #define DESC_INTERRUPT 0x20 | |
68 | #define DESC_IVALID 0x10 | |
69 | #define DESC_LEN(len) (len) | |
70 | ||
71 | /* Janz ICAN3 Firmware Messages */ | |
72 | #define MSG_CONNECTI 0x02 | |
73 | #define MSG_DISCONNECT 0x03 | |
74 | #define MSG_IDVERS 0x04 | |
75 | #define MSG_MSGLOST 0x05 | |
76 | #define MSG_NEWHOSTIF 0x08 | |
77 | #define MSG_INQUIRY 0x0a | |
78 | #define MSG_SETAFILMASK 0x10 | |
79 | #define MSG_INITFDPMQUEUE 0x11 | |
80 | #define MSG_HWCONF 0x12 | |
81 | #define MSG_FMSGLOST 0x15 | |
82 | #define MSG_CEVTIND 0x37 | |
83 | #define MSG_CBTRREQ 0x41 | |
84 | #define MSG_COFFREQ 0x42 | |
85 | #define MSG_CONREQ 0x43 | |
86 | #define MSG_CCONFREQ 0x47 | |
844e0edf | 87 | #define MSG_LMTS 0xb4 |
631eb227 IS |
88 | |
89 | /* | |
90 | * Janz ICAN3 CAN Inquiry Message Types | |
91 | * | |
92 | * NOTE: there appears to be a firmware bug here. You must send | |
93 | * NOTE: INQUIRY_STATUS and expect to receive an INQUIRY_EXTENDED | |
94 | * NOTE: response. The controller never responds to a message with | |
95 | * NOTE: the INQUIRY_EXTENDED subspec :( | |
96 | */ | |
97 | #define INQUIRY_STATUS 0x00 | |
98 | #define INQUIRY_TERMINATION 0x01 | |
99 | #define INQUIRY_EXTENDED 0x04 | |
100 | ||
101 | /* Janz ICAN3 CAN Set Acceptance Filter Mask Message Types */ | |
102 | #define SETAFILMASK_REJECT 0x00 | |
103 | #define SETAFILMASK_FASTIF 0x02 | |
104 | ||
105 | /* Janz ICAN3 CAN Hardware Configuration Message Types */ | |
106 | #define HWCONF_TERMINATE_ON 0x01 | |
107 | #define HWCONF_TERMINATE_OFF 0x00 | |
108 | ||
109 | /* Janz ICAN3 CAN Event Indication Message Types */ | |
110 | #define CEVTIND_EI 0x01 | |
111 | #define CEVTIND_DOI 0x02 | |
112 | #define CEVTIND_LOST 0x04 | |
113 | #define CEVTIND_FULL 0x08 | |
114 | #define CEVTIND_BEI 0x10 | |
115 | ||
116 | #define CEVTIND_CHIP_SJA1000 0x02 | |
117 | ||
118 | #define ICAN3_BUSERR_QUOTA_MAX 255 | |
119 | ||
120 | /* Janz ICAN3 CAN Frame Conversion */ | |
3b5c6b9e | 121 | #define ICAN3_SNGL 0x02 |
631eb227 IS |
122 | #define ICAN3_ECHO 0x10 |
123 | #define ICAN3_EFF_RTR 0x40 | |
124 | #define ICAN3_SFF_RTR 0x10 | |
125 | #define ICAN3_EFF 0x80 | |
126 | ||
127 | #define ICAN3_CAN_TYPE_MASK 0x0f | |
128 | #define ICAN3_CAN_TYPE_SFF 0x00 | |
129 | #define ICAN3_CAN_TYPE_EFF 0x01 | |
130 | ||
131 | #define ICAN3_CAN_DLC_MASK 0x0f | |
132 | ||
133 | /* | |
134 | * SJA1000 Status and Error Register Definitions | |
135 | * | |
136 | * Copied from drivers/net/can/sja1000/sja1000.h | |
137 | */ | |
138 | ||
139 | /* status register content */ | |
140 | #define SR_BS 0x80 | |
141 | #define SR_ES 0x40 | |
142 | #define SR_TS 0x20 | |
143 | #define SR_RS 0x10 | |
144 | #define SR_TCS 0x08 | |
145 | #define SR_TBS 0x04 | |
146 | #define SR_DOS 0x02 | |
147 | #define SR_RBS 0x01 | |
148 | ||
149 | #define SR_CRIT (SR_BS|SR_ES) | |
150 | ||
151 | /* ECC register */ | |
152 | #define ECC_SEG 0x1F | |
153 | #define ECC_DIR 0x20 | |
154 | #define ECC_ERR 6 | |
155 | #define ECC_BIT 0x00 | |
156 | #define ECC_FORM 0x40 | |
157 | #define ECC_STUFF 0x80 | |
158 | #define ECC_MASK 0xc0 | |
159 | ||
160 | /* Number of buffers for use in the "new-style" host interface */ | |
161 | #define ICAN3_NEW_BUFFERS 16 | |
162 | ||
163 | /* Number of buffers for use in the "fast" host interface */ | |
164 | #define ICAN3_TX_BUFFERS 512 | |
165 | #define ICAN3_RX_BUFFERS 1024 | |
166 | ||
167 | /* SJA1000 Clock Input */ | |
168 | #define ICAN3_CAN_CLOCK 8000000 | |
169 | ||
844e0edf AG |
170 | /* Janz ICAN3 firmware types */ |
171 | enum ican3_fwtype { | |
172 | ICAN3_FWTYPE_ICANOS, | |
173 | ICAN3_FWTYPE_CAL_CANOPEN, | |
174 | }; | |
175 | ||
631eb227 IS |
176 | /* Driver Name */ |
177 | #define DRV_NAME "janz-ican3" | |
178 | ||
179 | /* DPM Control Registers -- starts at offset 0x100 in the MODULbus registers */ | |
180 | struct ican3_dpm_control { | |
181 | /* window address register */ | |
182 | u8 window_address; | |
183 | u8 unused1; | |
184 | ||
185 | /* | |
186 | * Read access: clear interrupt from microcontroller | |
187 | * Write access: send interrupt to microcontroller | |
188 | */ | |
189 | u8 interrupt; | |
190 | u8 unused2; | |
191 | ||
192 | /* write-only: reset all hardware on the module */ | |
193 | u8 hwreset; | |
194 | u8 unused3; | |
195 | ||
196 | /* write-only: generate an interrupt to the TPU */ | |
197 | u8 tpuinterrupt; | |
198 | }; | |
199 | ||
200 | struct ican3_dev { | |
201 | ||
202 | /* must be the first member */ | |
203 | struct can_priv can; | |
204 | ||
205 | /* CAN network device */ | |
206 | struct net_device *ndev; | |
207 | struct napi_struct napi; | |
208 | ||
631eb227 IS |
209 | /* module number */ |
210 | unsigned int num; | |
211 | ||
212 | /* base address of registers and IRQ */ | |
213 | struct janz_cmodio_onboard_regs __iomem *ctrl; | |
214 | struct ican3_dpm_control __iomem *dpmctrl; | |
215 | void __iomem *dpm; | |
216 | int irq; | |
217 | ||
218 | /* CAN bus termination status */ | |
219 | struct completion termination_comp; | |
220 | bool termination_enabled; | |
221 | ||
222 | /* CAN bus error status registers */ | |
223 | struct completion buserror_comp; | |
224 | struct can_berr_counter bec; | |
225 | ||
844e0edf AG |
226 | /* firmware type */ |
227 | enum ican3_fwtype fwtype; | |
228 | char fwinfo[32]; | |
229 | ||
631eb227 IS |
230 | /* old and new style host interface */ |
231 | unsigned int iftype; | |
232 | ||
83702f69 IS |
233 | /* queue for echo packets */ |
234 | struct sk_buff_head echoq; | |
235 | ||
631eb227 IS |
236 | /* |
237 | * Any function which changes the current DPM page must hold this | |
238 | * lock while it is performing data accesses. This ensures that the | |
239 | * function will not be preempted and end up reading data from a | |
240 | * different DPM page than it expects. | |
241 | */ | |
242 | spinlock_t lock; | |
243 | ||
244 | /* new host interface */ | |
245 | unsigned int rx_int; | |
246 | unsigned int rx_num; | |
247 | unsigned int tx_num; | |
248 | ||
249 | /* fast host interface */ | |
250 | unsigned int fastrx_start; | |
631eb227 IS |
251 | unsigned int fastrx_num; |
252 | unsigned int fasttx_start; | |
253 | unsigned int fasttx_num; | |
254 | ||
255 | /* first free DPM page */ | |
256 | unsigned int free_page; | |
257 | }; | |
258 | ||
259 | struct ican3_msg { | |
260 | u8 control; | |
261 | u8 spec; | |
262 | __le16 len; | |
263 | u8 data[252]; | |
264 | }; | |
265 | ||
266 | struct ican3_new_desc { | |
267 | u8 control; | |
268 | u8 pointer; | |
269 | }; | |
270 | ||
271 | struct ican3_fast_desc { | |
272 | u8 control; | |
273 | u8 command; | |
274 | u8 data[14]; | |
275 | }; | |
276 | ||
277 | /* write to the window basic address register */ | |
278 | static inline void ican3_set_page(struct ican3_dev *mod, unsigned int page) | |
279 | { | |
280 | BUG_ON(page >= DPM_NUM_PAGES); | |
281 | iowrite8(page, &mod->dpmctrl->window_address); | |
282 | } | |
283 | ||
284 | /* | |
285 | * ICAN3 "old-style" host interface | |
286 | */ | |
287 | ||
288 | /* | |
25985edc | 289 | * Receive a message from the ICAN3 "old-style" firmware interface |
631eb227 IS |
290 | * |
291 | * LOCKING: must hold mod->lock | |
292 | * | |
293 | * returns 0 on success, -ENOMEM when no message exists | |
294 | */ | |
295 | static int ican3_old_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg) | |
296 | { | |
297 | unsigned int mbox, mbox_page; | |
298 | u8 locl, peer, xord; | |
299 | ||
300 | /* get the MSYNC registers */ | |
301 | ican3_set_page(mod, QUEUE_OLD_CONTROL); | |
302 | peer = ioread8(mod->dpm + MSYNC_PEER); | |
303 | locl = ioread8(mod->dpm + MSYNC_LOCL); | |
304 | xord = locl ^ peer; | |
305 | ||
306 | if ((xord & MSYNC_RB_MASK) == 0x00) { | |
a8ca2efc | 307 | netdev_dbg(mod->ndev, "no mbox for reading\n"); |
631eb227 IS |
308 | return -ENOMEM; |
309 | } | |
310 | ||
311 | /* find the first free mbox to read */ | |
312 | if ((xord & MSYNC_RB_MASK) == MSYNC_RB_MASK) | |
313 | mbox = (xord & MSYNC_RBLW) ? MSYNC_RB0 : MSYNC_RB1; | |
314 | else | |
315 | mbox = (xord & MSYNC_RB0) ? MSYNC_RB0 : MSYNC_RB1; | |
316 | ||
317 | /* copy the message */ | |
318 | mbox_page = (mbox == MSYNC_RB0) ? QUEUE_OLD_RB0 : QUEUE_OLD_RB1; | |
319 | ican3_set_page(mod, mbox_page); | |
320 | memcpy_fromio(msg, mod->dpm, sizeof(*msg)); | |
321 | ||
322 | /* | |
323 | * notify the firmware that the read buffer is available | |
324 | * for it to fill again | |
325 | */ | |
326 | locl ^= mbox; | |
327 | ||
328 | ican3_set_page(mod, QUEUE_OLD_CONTROL); | |
329 | iowrite8(locl, mod->dpm + MSYNC_LOCL); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Send a message through the "old-style" firmware interface | |
335 | * | |
336 | * LOCKING: must hold mod->lock | |
337 | * | |
338 | * returns 0 on success, -ENOMEM when no free space exists | |
339 | */ | |
340 | static int ican3_old_send_msg(struct ican3_dev *mod, struct ican3_msg *msg) | |
341 | { | |
342 | unsigned int mbox, mbox_page; | |
343 | u8 locl, peer, xord; | |
344 | ||
345 | /* get the MSYNC registers */ | |
346 | ican3_set_page(mod, QUEUE_OLD_CONTROL); | |
347 | peer = ioread8(mod->dpm + MSYNC_PEER); | |
348 | locl = ioread8(mod->dpm + MSYNC_LOCL); | |
349 | xord = locl ^ peer; | |
350 | ||
351 | if ((xord & MSYNC_WB_MASK) == MSYNC_WB_MASK) { | |
a8ca2efc | 352 | netdev_err(mod->ndev, "no mbox for writing\n"); |
631eb227 IS |
353 | return -ENOMEM; |
354 | } | |
355 | ||
356 | /* calculate a free mbox to use */ | |
357 | mbox = (xord & MSYNC_WB0) ? MSYNC_WB1 : MSYNC_WB0; | |
358 | ||
359 | /* copy the message to the DPM */ | |
360 | mbox_page = (mbox == MSYNC_WB0) ? QUEUE_OLD_WB0 : QUEUE_OLD_WB1; | |
361 | ican3_set_page(mod, mbox_page); | |
362 | memcpy_toio(mod->dpm, msg, sizeof(*msg)); | |
363 | ||
364 | locl ^= mbox; | |
365 | if (mbox == MSYNC_WB1) | |
366 | locl |= MSYNC_WBLW; | |
367 | ||
368 | ican3_set_page(mod, QUEUE_OLD_CONTROL); | |
369 | iowrite8(locl, mod->dpm + MSYNC_LOCL); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* | |
374 | * ICAN3 "new-style" Host Interface Setup | |
375 | */ | |
376 | ||
3c8ac0f2 | 377 | static void ican3_init_new_host_interface(struct ican3_dev *mod) |
631eb227 IS |
378 | { |
379 | struct ican3_new_desc desc; | |
380 | unsigned long flags; | |
381 | void __iomem *dst; | |
382 | int i; | |
383 | ||
384 | spin_lock_irqsave(&mod->lock, flags); | |
385 | ||
386 | /* setup the internal datastructures for RX */ | |
387 | mod->rx_num = 0; | |
388 | mod->rx_int = 0; | |
389 | ||
390 | /* tohost queue descriptors are in page 5 */ | |
391 | ican3_set_page(mod, QUEUE_TOHOST); | |
392 | dst = mod->dpm; | |
393 | ||
394 | /* initialize the tohost (rx) queue descriptors: pages 9-24 */ | |
395 | for (i = 0; i < ICAN3_NEW_BUFFERS; i++) { | |
396 | desc.control = DESC_INTERRUPT | DESC_LEN(1); /* I L=1 */ | |
397 | desc.pointer = mod->free_page; | |
398 | ||
399 | /* set wrap flag on last buffer */ | |
400 | if (i == ICAN3_NEW_BUFFERS - 1) | |
401 | desc.control |= DESC_WRAP; | |
402 | ||
403 | memcpy_toio(dst, &desc, sizeof(desc)); | |
404 | dst += sizeof(desc); | |
405 | mod->free_page++; | |
406 | } | |
407 | ||
408 | /* fromhost (tx) mid queue descriptors are in page 6 */ | |
409 | ican3_set_page(mod, QUEUE_FROMHOST_MID); | |
410 | dst = mod->dpm; | |
411 | ||
412 | /* setup the internal datastructures for TX */ | |
413 | mod->tx_num = 0; | |
414 | ||
415 | /* initialize the fromhost mid queue descriptors: pages 25-40 */ | |
416 | for (i = 0; i < ICAN3_NEW_BUFFERS; i++) { | |
417 | desc.control = DESC_VALID | DESC_LEN(1); /* V L=1 */ | |
418 | desc.pointer = mod->free_page; | |
419 | ||
420 | /* set wrap flag on last buffer */ | |
421 | if (i == ICAN3_NEW_BUFFERS - 1) | |
422 | desc.control |= DESC_WRAP; | |
423 | ||
424 | memcpy_toio(dst, &desc, sizeof(desc)); | |
425 | dst += sizeof(desc); | |
426 | mod->free_page++; | |
427 | } | |
428 | ||
429 | /* fromhost hi queue descriptors are in page 7 */ | |
430 | ican3_set_page(mod, QUEUE_FROMHOST_HIGH); | |
431 | dst = mod->dpm; | |
432 | ||
433 | /* initialize only a single buffer in the fromhost hi queue (unused) */ | |
434 | desc.control = DESC_VALID | DESC_WRAP | DESC_LEN(1); /* VW L=1 */ | |
435 | desc.pointer = mod->free_page; | |
436 | memcpy_toio(dst, &desc, sizeof(desc)); | |
437 | mod->free_page++; | |
438 | ||
439 | /* fromhost low queue descriptors are in page 8 */ | |
440 | ican3_set_page(mod, QUEUE_FROMHOST_LOW); | |
441 | dst = mod->dpm; | |
442 | ||
443 | /* initialize only a single buffer in the fromhost low queue (unused) */ | |
444 | desc.control = DESC_VALID | DESC_WRAP | DESC_LEN(1); /* VW L=1 */ | |
445 | desc.pointer = mod->free_page; | |
446 | memcpy_toio(dst, &desc, sizeof(desc)); | |
447 | mod->free_page++; | |
448 | ||
449 | spin_unlock_irqrestore(&mod->lock, flags); | |
450 | } | |
451 | ||
452 | /* | |
453 | * ICAN3 Fast Host Interface Setup | |
454 | */ | |
455 | ||
3c8ac0f2 | 456 | static void ican3_init_fast_host_interface(struct ican3_dev *mod) |
631eb227 IS |
457 | { |
458 | struct ican3_fast_desc desc; | |
459 | unsigned long flags; | |
460 | unsigned int addr; | |
461 | void __iomem *dst; | |
462 | int i; | |
463 | ||
464 | spin_lock_irqsave(&mod->lock, flags); | |
465 | ||
466 | /* save the start recv page */ | |
467 | mod->fastrx_start = mod->free_page; | |
468 | mod->fastrx_num = 0; | |
631eb227 IS |
469 | |
470 | /* build a single fast tohost queue descriptor */ | |
471 | memset(&desc, 0, sizeof(desc)); | |
472 | desc.control = 0x00; | |
473 | desc.command = 1; | |
474 | ||
475 | /* build the tohost queue descriptor ring in memory */ | |
476 | addr = 0; | |
477 | for (i = 0; i < ICAN3_RX_BUFFERS; i++) { | |
478 | ||
479 | /* set the wrap bit on the last buffer */ | |
480 | if (i == ICAN3_RX_BUFFERS - 1) | |
481 | desc.control |= DESC_WRAP; | |
482 | ||
483 | /* switch to the correct page */ | |
484 | ican3_set_page(mod, mod->free_page); | |
485 | ||
486 | /* copy the descriptor to the DPM */ | |
487 | dst = mod->dpm + addr; | |
488 | memcpy_toio(dst, &desc, sizeof(desc)); | |
489 | addr += sizeof(desc); | |
490 | ||
491 | /* move to the next page if necessary */ | |
492 | if (addr >= DPM_PAGE_SIZE) { | |
493 | addr = 0; | |
494 | mod->free_page++; | |
495 | } | |
496 | } | |
497 | ||
498 | /* make sure we page-align the next queue */ | |
499 | if (addr != 0) | |
500 | mod->free_page++; | |
501 | ||
502 | /* save the start xmit page */ | |
503 | mod->fasttx_start = mod->free_page; | |
504 | mod->fasttx_num = 0; | |
505 | ||
506 | /* build a single fast fromhost queue descriptor */ | |
507 | memset(&desc, 0, sizeof(desc)); | |
508 | desc.control = DESC_VALID; | |
509 | desc.command = 1; | |
510 | ||
511 | /* build the fromhost queue descriptor ring in memory */ | |
512 | addr = 0; | |
513 | for (i = 0; i < ICAN3_TX_BUFFERS; i++) { | |
514 | ||
515 | /* set the wrap bit on the last buffer */ | |
516 | if (i == ICAN3_TX_BUFFERS - 1) | |
517 | desc.control |= DESC_WRAP; | |
518 | ||
519 | /* switch to the correct page */ | |
520 | ican3_set_page(mod, mod->free_page); | |
521 | ||
522 | /* copy the descriptor to the DPM */ | |
523 | dst = mod->dpm + addr; | |
524 | memcpy_toio(dst, &desc, sizeof(desc)); | |
525 | addr += sizeof(desc); | |
526 | ||
527 | /* move to the next page if necessary */ | |
528 | if (addr >= DPM_PAGE_SIZE) { | |
529 | addr = 0; | |
530 | mod->free_page++; | |
531 | } | |
532 | } | |
533 | ||
534 | spin_unlock_irqrestore(&mod->lock, flags); | |
535 | } | |
536 | ||
537 | /* | |
538 | * ICAN3 "new-style" Host Interface Message Helpers | |
539 | */ | |
540 | ||
541 | /* | |
542 | * LOCKING: must hold mod->lock | |
543 | */ | |
544 | static int ican3_new_send_msg(struct ican3_dev *mod, struct ican3_msg *msg) | |
545 | { | |
546 | struct ican3_new_desc desc; | |
547 | void __iomem *desc_addr = mod->dpm + (mod->tx_num * sizeof(desc)); | |
548 | ||
549 | /* switch to the fromhost mid queue, and read the buffer descriptor */ | |
550 | ican3_set_page(mod, QUEUE_FROMHOST_MID); | |
551 | memcpy_fromio(&desc, desc_addr, sizeof(desc)); | |
552 | ||
553 | if (!(desc.control & DESC_VALID)) { | |
a8ca2efc | 554 | netdev_dbg(mod->ndev, "%s: no free buffers\n", __func__); |
631eb227 IS |
555 | return -ENOMEM; |
556 | } | |
557 | ||
558 | /* switch to the data page, copy the data */ | |
559 | ican3_set_page(mod, desc.pointer); | |
560 | memcpy_toio(mod->dpm, msg, sizeof(*msg)); | |
561 | ||
562 | /* switch back to the descriptor, set the valid bit, write it back */ | |
563 | ican3_set_page(mod, QUEUE_FROMHOST_MID); | |
564 | desc.control ^= DESC_VALID; | |
565 | memcpy_toio(desc_addr, &desc, sizeof(desc)); | |
566 | ||
567 | /* update the tx number */ | |
568 | mod->tx_num = (desc.control & DESC_WRAP) ? 0 : (mod->tx_num + 1); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | /* | |
573 | * LOCKING: must hold mod->lock | |
574 | */ | |
575 | static int ican3_new_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg) | |
576 | { | |
577 | struct ican3_new_desc desc; | |
578 | void __iomem *desc_addr = mod->dpm + (mod->rx_num * sizeof(desc)); | |
579 | ||
580 | /* switch to the tohost queue, and read the buffer descriptor */ | |
581 | ican3_set_page(mod, QUEUE_TOHOST); | |
582 | memcpy_fromio(&desc, desc_addr, sizeof(desc)); | |
583 | ||
584 | if (!(desc.control & DESC_VALID)) { | |
a8ca2efc | 585 | netdev_dbg(mod->ndev, "%s: no buffers to recv\n", __func__); |
631eb227 IS |
586 | return -ENOMEM; |
587 | } | |
588 | ||
589 | /* switch to the data page, copy the data */ | |
590 | ican3_set_page(mod, desc.pointer); | |
591 | memcpy_fromio(msg, mod->dpm, sizeof(*msg)); | |
592 | ||
593 | /* switch back to the descriptor, toggle the valid bit, write it back */ | |
594 | ican3_set_page(mod, QUEUE_TOHOST); | |
595 | desc.control ^= DESC_VALID; | |
596 | memcpy_toio(desc_addr, &desc, sizeof(desc)); | |
597 | ||
598 | /* update the rx number */ | |
599 | mod->rx_num = (desc.control & DESC_WRAP) ? 0 : (mod->rx_num + 1); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Message Send / Recv Helpers | |
605 | */ | |
606 | ||
607 | static int ican3_send_msg(struct ican3_dev *mod, struct ican3_msg *msg) | |
608 | { | |
609 | unsigned long flags; | |
610 | int ret; | |
611 | ||
612 | spin_lock_irqsave(&mod->lock, flags); | |
613 | ||
614 | if (mod->iftype == 0) | |
615 | ret = ican3_old_send_msg(mod, msg); | |
616 | else | |
617 | ret = ican3_new_send_msg(mod, msg); | |
618 | ||
619 | spin_unlock_irqrestore(&mod->lock, flags); | |
620 | return ret; | |
621 | } | |
622 | ||
623 | static int ican3_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg) | |
624 | { | |
625 | unsigned long flags; | |
626 | int ret; | |
627 | ||
628 | spin_lock_irqsave(&mod->lock, flags); | |
629 | ||
630 | if (mod->iftype == 0) | |
631 | ret = ican3_old_recv_msg(mod, msg); | |
632 | else | |
633 | ret = ican3_new_recv_msg(mod, msg); | |
634 | ||
635 | spin_unlock_irqrestore(&mod->lock, flags); | |
636 | return ret; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Quick Pre-constructed Messages | |
641 | */ | |
642 | ||
3c8ac0f2 | 643 | static int ican3_msg_connect(struct ican3_dev *mod) |
631eb227 IS |
644 | { |
645 | struct ican3_msg msg; | |
646 | ||
647 | memset(&msg, 0, sizeof(msg)); | |
648 | msg.spec = MSG_CONNECTI; | |
649 | msg.len = cpu_to_le16(0); | |
650 | ||
651 | return ican3_send_msg(mod, &msg); | |
652 | } | |
653 | ||
3c8ac0f2 | 654 | static int ican3_msg_disconnect(struct ican3_dev *mod) |
631eb227 IS |
655 | { |
656 | struct ican3_msg msg; | |
657 | ||
658 | memset(&msg, 0, sizeof(msg)); | |
659 | msg.spec = MSG_DISCONNECT; | |
660 | msg.len = cpu_to_le16(0); | |
661 | ||
662 | return ican3_send_msg(mod, &msg); | |
663 | } | |
664 | ||
3c8ac0f2 | 665 | static int ican3_msg_newhostif(struct ican3_dev *mod) |
631eb227 IS |
666 | { |
667 | struct ican3_msg msg; | |
668 | int ret; | |
669 | ||
670 | memset(&msg, 0, sizeof(msg)); | |
671 | msg.spec = MSG_NEWHOSTIF; | |
672 | msg.len = cpu_to_le16(0); | |
673 | ||
674 | /* If we're not using the old interface, switching seems bogus */ | |
675 | WARN_ON(mod->iftype != 0); | |
676 | ||
677 | ret = ican3_send_msg(mod, &msg); | |
678 | if (ret) | |
679 | return ret; | |
680 | ||
681 | /* mark the module as using the new host interface */ | |
682 | mod->iftype = 1; | |
683 | return 0; | |
684 | } | |
685 | ||
3c8ac0f2 | 686 | static int ican3_msg_fasthostif(struct ican3_dev *mod) |
631eb227 IS |
687 | { |
688 | struct ican3_msg msg; | |
689 | unsigned int addr; | |
690 | ||
691 | memset(&msg, 0, sizeof(msg)); | |
692 | msg.spec = MSG_INITFDPMQUEUE; | |
693 | msg.len = cpu_to_le16(8); | |
694 | ||
695 | /* write the tohost queue start address */ | |
696 | addr = DPM_PAGE_ADDR(mod->fastrx_start); | |
697 | msg.data[0] = addr & 0xff; | |
698 | msg.data[1] = (addr >> 8) & 0xff; | |
699 | msg.data[2] = (addr >> 16) & 0xff; | |
700 | msg.data[3] = (addr >> 24) & 0xff; | |
701 | ||
702 | /* write the fromhost queue start address */ | |
703 | addr = DPM_PAGE_ADDR(mod->fasttx_start); | |
704 | msg.data[4] = addr & 0xff; | |
705 | msg.data[5] = (addr >> 8) & 0xff; | |
706 | msg.data[6] = (addr >> 16) & 0xff; | |
707 | msg.data[7] = (addr >> 24) & 0xff; | |
708 | ||
709 | /* If we're not using the new interface yet, we cannot do this */ | |
710 | WARN_ON(mod->iftype != 1); | |
711 | ||
712 | return ican3_send_msg(mod, &msg); | |
713 | } | |
714 | ||
715 | /* | |
716 | * Setup the CAN filter to either accept or reject all | |
717 | * messages from the CAN bus. | |
718 | */ | |
3c8ac0f2 | 719 | static int ican3_set_id_filter(struct ican3_dev *mod, bool accept) |
631eb227 IS |
720 | { |
721 | struct ican3_msg msg; | |
722 | int ret; | |
723 | ||
724 | /* Standard Frame Format */ | |
725 | memset(&msg, 0, sizeof(msg)); | |
726 | msg.spec = MSG_SETAFILMASK; | |
727 | msg.len = cpu_to_le16(5); | |
728 | msg.data[0] = 0x00; /* IDLo LSB */ | |
729 | msg.data[1] = 0x00; /* IDLo MSB */ | |
730 | msg.data[2] = 0xff; /* IDHi LSB */ | |
731 | msg.data[3] = 0x07; /* IDHi MSB */ | |
732 | ||
733 | /* accept all frames for fast host if, or reject all frames */ | |
734 | msg.data[4] = accept ? SETAFILMASK_FASTIF : SETAFILMASK_REJECT; | |
735 | ||
736 | ret = ican3_send_msg(mod, &msg); | |
737 | if (ret) | |
738 | return ret; | |
739 | ||
740 | /* Extended Frame Format */ | |
741 | memset(&msg, 0, sizeof(msg)); | |
742 | msg.spec = MSG_SETAFILMASK; | |
743 | msg.len = cpu_to_le16(13); | |
744 | msg.data[0] = 0; /* MUX = 0 */ | |
745 | msg.data[1] = 0x00; /* IDLo LSB */ | |
746 | msg.data[2] = 0x00; | |
747 | msg.data[3] = 0x00; | |
748 | msg.data[4] = 0x20; /* IDLo MSB */ | |
749 | msg.data[5] = 0xff; /* IDHi LSB */ | |
750 | msg.data[6] = 0xff; | |
751 | msg.data[7] = 0xff; | |
752 | msg.data[8] = 0x3f; /* IDHi MSB */ | |
753 | ||
754 | /* accept all frames for fast host if, or reject all frames */ | |
755 | msg.data[9] = accept ? SETAFILMASK_FASTIF : SETAFILMASK_REJECT; | |
756 | ||
757 | return ican3_send_msg(mod, &msg); | |
758 | } | |
759 | ||
760 | /* | |
761 | * Bring the CAN bus online or offline | |
762 | */ | |
763 | static int ican3_set_bus_state(struct ican3_dev *mod, bool on) | |
764 | { | |
844e0edf | 765 | struct can_bittiming *bt = &mod->can.bittiming; |
631eb227 | 766 | struct ican3_msg msg; |
844e0edf AG |
767 | u8 btr0, btr1; |
768 | int res; | |
631eb227 | 769 | |
844e0edf AG |
770 | /* This algorithm was stolen from drivers/net/can/sja1000/sja1000.c */ |
771 | /* The bittiming register command for the ICAN3 just sets the bit timing */ | |
772 | /* registers on the SJA1000 chip directly */ | |
773 | btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); | |
774 | btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | | |
775 | (((bt->phase_seg2 - 1) & 0x7) << 4); | |
776 | if (mod->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) | |
777 | btr1 |= 0x80; | |
631eb227 | 778 | |
844e0edf AG |
779 | if (mod->fwtype == ICAN3_FWTYPE_ICANOS) { |
780 | if (on) { | |
781 | /* set bittiming */ | |
782 | memset(&msg, 0, sizeof(msg)); | |
783 | msg.spec = MSG_CBTRREQ; | |
784 | msg.len = cpu_to_le16(4); | |
785 | msg.data[0] = 0x00; | |
786 | msg.data[1] = 0x00; | |
787 | msg.data[2] = btr0; | |
788 | msg.data[3] = btr1; | |
789 | ||
790 | res = ican3_send_msg(mod, &msg); | |
791 | if (res) | |
792 | return res; | |
793 | } | |
794 | ||
795 | /* can-on/off request */ | |
796 | memset(&msg, 0, sizeof(msg)); | |
797 | msg.spec = on ? MSG_CONREQ : MSG_COFFREQ; | |
798 | msg.len = cpu_to_le16(0); | |
799 | ||
800 | return ican3_send_msg(mod, &msg); | |
801 | ||
802 | } else if (mod->fwtype == ICAN3_FWTYPE_CAL_CANOPEN) { | |
803 | memset(&msg, 0, sizeof(msg)); | |
804 | msg.spec = MSG_LMTS; | |
805 | if (on) { | |
806 | msg.len = cpu_to_le16(4); | |
807 | msg.data[0] = 0; | |
808 | msg.data[1] = 0; | |
809 | msg.data[2] = btr0; | |
810 | msg.data[3] = btr1; | |
811 | } else { | |
812 | msg.len = cpu_to_le16(2); | |
813 | msg.data[0] = 1; | |
814 | msg.data[1] = 0; | |
815 | } | |
816 | ||
817 | return ican3_send_msg(mod, &msg); | |
818 | } | |
819 | return -ENOTSUPP; | |
631eb227 IS |
820 | } |
821 | ||
822 | static int ican3_set_termination(struct ican3_dev *mod, bool on) | |
823 | { | |
824 | struct ican3_msg msg; | |
825 | ||
826 | memset(&msg, 0, sizeof(msg)); | |
827 | msg.spec = MSG_HWCONF; | |
828 | msg.len = cpu_to_le16(2); | |
829 | msg.data[0] = 0x00; | |
830 | msg.data[1] = on ? HWCONF_TERMINATE_ON : HWCONF_TERMINATE_OFF; | |
831 | ||
832 | return ican3_send_msg(mod, &msg); | |
833 | } | |
834 | ||
835 | static int ican3_send_inquiry(struct ican3_dev *mod, u8 subspec) | |
836 | { | |
837 | struct ican3_msg msg; | |
838 | ||
839 | memset(&msg, 0, sizeof(msg)); | |
840 | msg.spec = MSG_INQUIRY; | |
841 | msg.len = cpu_to_le16(2); | |
842 | msg.data[0] = subspec; | |
843 | msg.data[1] = 0x00; | |
844 | ||
845 | return ican3_send_msg(mod, &msg); | |
846 | } | |
847 | ||
848 | static int ican3_set_buserror(struct ican3_dev *mod, u8 quota) | |
849 | { | |
850 | struct ican3_msg msg; | |
851 | ||
852 | memset(&msg, 0, sizeof(msg)); | |
853 | msg.spec = MSG_CCONFREQ; | |
854 | msg.len = cpu_to_le16(2); | |
855 | msg.data[0] = 0x00; | |
856 | msg.data[1] = quota; | |
857 | ||
858 | return ican3_send_msg(mod, &msg); | |
859 | } | |
860 | ||
861 | /* | |
862 | * ICAN3 to Linux CAN Frame Conversion | |
863 | */ | |
864 | ||
865 | static void ican3_to_can_frame(struct ican3_dev *mod, | |
866 | struct ican3_fast_desc *desc, | |
867 | struct can_frame *cf) | |
868 | { | |
869 | if ((desc->command & ICAN3_CAN_TYPE_MASK) == ICAN3_CAN_TYPE_SFF) { | |
870 | if (desc->data[1] & ICAN3_SFF_RTR) | |
871 | cf->can_id |= CAN_RTR_FLAG; | |
872 | ||
873 | cf->can_id |= desc->data[0] << 3; | |
874 | cf->can_id |= (desc->data[1] & 0xe0) >> 5; | |
9e4d6909 MKB |
875 | cf->can_dlc = get_can_dlc(desc->data[1] & ICAN3_CAN_DLC_MASK); |
876 | memcpy(cf->data, &desc->data[2], cf->can_dlc); | |
631eb227 | 877 | } else { |
9e4d6909 | 878 | cf->can_dlc = get_can_dlc(desc->data[0] & ICAN3_CAN_DLC_MASK); |
631eb227 IS |
879 | if (desc->data[0] & ICAN3_EFF_RTR) |
880 | cf->can_id |= CAN_RTR_FLAG; | |
881 | ||
882 | if (desc->data[0] & ICAN3_EFF) { | |
883 | cf->can_id |= CAN_EFF_FLAG; | |
884 | cf->can_id |= desc->data[2] << 21; /* 28-21 */ | |
885 | cf->can_id |= desc->data[3] << 13; /* 20-13 */ | |
886 | cf->can_id |= desc->data[4] << 5; /* 12-5 */ | |
887 | cf->can_id |= (desc->data[5] & 0xf8) >> 3; | |
888 | } else { | |
889 | cf->can_id |= desc->data[2] << 3; /* 10-3 */ | |
890 | cf->can_id |= desc->data[3] >> 5; /* 2-0 */ | |
891 | } | |
892 | ||
9e4d6909 | 893 | memcpy(cf->data, &desc->data[6], cf->can_dlc); |
631eb227 IS |
894 | } |
895 | } | |
896 | ||
897 | static void can_frame_to_ican3(struct ican3_dev *mod, | |
898 | struct can_frame *cf, | |
899 | struct ican3_fast_desc *desc) | |
900 | { | |
901 | /* clear out any stale data in the descriptor */ | |
902 | memset(desc->data, 0, sizeof(desc->data)); | |
903 | ||
904 | /* we always use the extended format, with the ECHO flag set */ | |
905 | desc->command = ICAN3_CAN_TYPE_EFF; | |
906 | desc->data[0] |= cf->can_dlc; | |
907 | desc->data[1] |= ICAN3_ECHO; | |
908 | ||
3b5c6b9e IS |
909 | /* support single transmission (no retries) mode */ |
910 | if (mod->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) | |
911 | desc->data[1] |= ICAN3_SNGL; | |
912 | ||
631eb227 IS |
913 | if (cf->can_id & CAN_RTR_FLAG) |
914 | desc->data[0] |= ICAN3_EFF_RTR; | |
915 | ||
916 | /* pack the id into the correct places */ | |
917 | if (cf->can_id & CAN_EFF_FLAG) { | |
918 | desc->data[0] |= ICAN3_EFF; | |
919 | desc->data[2] = (cf->can_id & 0x1fe00000) >> 21; /* 28-21 */ | |
920 | desc->data[3] = (cf->can_id & 0x001fe000) >> 13; /* 20-13 */ | |
921 | desc->data[4] = (cf->can_id & 0x00001fe0) >> 5; /* 12-5 */ | |
922 | desc->data[5] = (cf->can_id & 0x0000001f) << 3; /* 4-0 */ | |
923 | } else { | |
924 | desc->data[2] = (cf->can_id & 0x7F8) >> 3; /* bits 10-3 */ | |
925 | desc->data[3] = (cf->can_id & 0x007) << 5; /* bits 2-0 */ | |
926 | } | |
927 | ||
928 | /* copy the data bits into the descriptor */ | |
9e4d6909 | 929 | memcpy(&desc->data[6], cf->data, cf->can_dlc); |
631eb227 IS |
930 | } |
931 | ||
932 | /* | |
933 | * Interrupt Handling | |
934 | */ | |
935 | ||
936 | /* | |
937 | * Handle an ID + Version message response from the firmware. We never generate | |
938 | * this message in production code, but it is very useful when debugging to be | |
939 | * able to display this message. | |
940 | */ | |
941 | static void ican3_handle_idvers(struct ican3_dev *mod, struct ican3_msg *msg) | |
942 | { | |
a8ca2efc | 943 | netdev_dbg(mod->ndev, "IDVERS response: %s\n", msg->data); |
631eb227 IS |
944 | } |
945 | ||
946 | static void ican3_handle_msglost(struct ican3_dev *mod, struct ican3_msg *msg) | |
947 | { | |
948 | struct net_device *dev = mod->ndev; | |
949 | struct net_device_stats *stats = &dev->stats; | |
950 | struct can_frame *cf; | |
951 | struct sk_buff *skb; | |
952 | ||
953 | /* | |
954 | * Report that communication messages with the microcontroller firmware | |
955 | * are being lost. These are never CAN frames, so we do not generate an | |
956 | * error frame for userspace | |
957 | */ | |
958 | if (msg->spec == MSG_MSGLOST) { | |
a8ca2efc | 959 | netdev_err(mod->ndev, "lost %d control messages\n", msg->data[0]); |
631eb227 IS |
960 | return; |
961 | } | |
962 | ||
963 | /* | |
964 | * Oops, this indicates that we have lost messages in the fast queue, | |
965 | * which are exclusively CAN messages. Our driver isn't reading CAN | |
966 | * frames fast enough. | |
967 | * | |
968 | * We'll pretend that the SJA1000 told us that it ran out of buffer | |
969 | * space, because there is not a better message for this. | |
970 | */ | |
971 | skb = alloc_can_err_skb(dev, &cf); | |
972 | if (skb) { | |
973 | cf->can_id |= CAN_ERR_CRTL; | |
974 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
88b58703 | 975 | stats->rx_over_errors++; |
631eb227 | 976 | stats->rx_errors++; |
631eb227 IS |
977 | netif_rx(skb); |
978 | } | |
979 | } | |
980 | ||
981 | /* | |
982 | * Handle CAN Event Indication Messages from the firmware | |
983 | * | |
984 | * The ICAN3 firmware provides the values of some SJA1000 registers when it | |
985 | * generates this message. The code below is largely copied from the | |
986 | * drivers/net/can/sja1000/sja1000.c file, and adapted as necessary | |
987 | */ | |
988 | static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg) | |
989 | { | |
990 | struct net_device *dev = mod->ndev; | |
991 | struct net_device_stats *stats = &dev->stats; | |
992 | enum can_state state = mod->can.state; | |
83702f69 | 993 | u8 isrc, ecc, status, rxerr, txerr; |
631eb227 IS |
994 | struct can_frame *cf; |
995 | struct sk_buff *skb; | |
996 | ||
997 | /* we can only handle the SJA1000 part */ | |
998 | if (msg->data[1] != CEVTIND_CHIP_SJA1000) { | |
a8ca2efc | 999 | netdev_err(mod->ndev, "unable to handle errors on non-SJA1000\n"); |
631eb227 IS |
1000 | return -ENODEV; |
1001 | } | |
1002 | ||
1003 | /* check the message length for sanity */ | |
1004 | if (le16_to_cpu(msg->len) < 6) { | |
a8ca2efc | 1005 | netdev_err(mod->ndev, "error message too short\n"); |
631eb227 IS |
1006 | return -EINVAL; |
1007 | } | |
1008 | ||
631eb227 | 1009 | isrc = msg->data[0]; |
83702f69 | 1010 | ecc = msg->data[2]; |
631eb227 IS |
1011 | status = msg->data[3]; |
1012 | rxerr = msg->data[4]; | |
1013 | txerr = msg->data[5]; | |
1014 | ||
83702f69 IS |
1015 | /* |
1016 | * This hardware lacks any support other than bus error messages to | |
1017 | * determine if packet transmission has failed. | |
1018 | * | |
1019 | * When TX errors happen, one echo skb needs to be dropped from the | |
1020 | * front of the queue. | |
1021 | * | |
1022 | * A small bit of code is duplicated here and below, to avoid error | |
1023 | * skb allocation when it will just be freed immediately. | |
1024 | */ | |
1025 | if (isrc == CEVTIND_BEI) { | |
1026 | int ret; | |
a8ca2efc | 1027 | netdev_dbg(mod->ndev, "bus error interrupt\n"); |
83702f69 IS |
1028 | |
1029 | /* TX error */ | |
1030 | if (!(ecc & ECC_DIR)) { | |
1031 | kfree_skb(skb_dequeue(&mod->echoq)); | |
1032 | stats->tx_errors++; | |
1033 | } else { | |
1034 | stats->rx_errors++; | |
1035 | } | |
1036 | ||
30df5888 IS |
1037 | /* |
1038 | * The controller automatically disables bus-error interrupts | |
1039 | * and therefore we must re-enable them. | |
1040 | */ | |
1041 | ret = ican3_set_buserror(mod, 1); | |
1042 | if (ret) { | |
a8ca2efc | 1043 | netdev_err(mod->ndev, "unable to re-enable bus-error\n"); |
30df5888 IS |
1044 | return ret; |
1045 | } | |
1046 | ||
83702f69 IS |
1047 | /* bus error reporting is off, return immediately */ |
1048 | if (!(mod->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | skb = alloc_can_err_skb(dev, &cf); | |
1053 | if (skb == NULL) | |
1054 | return -ENOMEM; | |
1055 | ||
631eb227 IS |
1056 | /* data overrun interrupt */ |
1057 | if (isrc == CEVTIND_DOI || isrc == CEVTIND_LOST) { | |
a8ca2efc | 1058 | netdev_dbg(mod->ndev, "data overrun interrupt\n"); |
631eb227 IS |
1059 | cf->can_id |= CAN_ERR_CRTL; |
1060 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
1061 | stats->rx_over_errors++; | |
1062 | stats->rx_errors++; | |
1063 | } | |
1064 | ||
1065 | /* error warning + passive interrupt */ | |
1066 | if (isrc == CEVTIND_EI) { | |
a8ca2efc | 1067 | netdev_dbg(mod->ndev, "error warning + passive interrupt\n"); |
631eb227 IS |
1068 | if (status & SR_BS) { |
1069 | state = CAN_STATE_BUS_OFF; | |
1070 | cf->can_id |= CAN_ERR_BUSOFF; | |
be38a6f9 | 1071 | mod->can.can_stats.bus_off++; |
631eb227 IS |
1072 | can_bus_off(dev); |
1073 | } else if (status & SR_ES) { | |
1074 | if (rxerr >= 128 || txerr >= 128) | |
1075 | state = CAN_STATE_ERROR_PASSIVE; | |
1076 | else | |
1077 | state = CAN_STATE_ERROR_WARNING; | |
1078 | } else { | |
1079 | state = CAN_STATE_ERROR_ACTIVE; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* bus error interrupt */ | |
1084 | if (isrc == CEVTIND_BEI) { | |
631eb227 | 1085 | mod->can.can_stats.bus_error++; |
631eb227 IS |
1086 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
1087 | ||
1088 | switch (ecc & ECC_MASK) { | |
1089 | case ECC_BIT: | |
1090 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
1091 | break; | |
1092 | case ECC_FORM: | |
1093 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
1094 | break; | |
1095 | case ECC_STUFF: | |
1096 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
1097 | break; | |
1098 | default: | |
631eb227 IS |
1099 | cf->data[3] = ecc & ECC_SEG; |
1100 | break; | |
1101 | } | |
1102 | ||
83702f69 | 1103 | if (!(ecc & ECC_DIR)) |
631eb227 IS |
1104 | cf->data[2] |= CAN_ERR_PROT_TX; |
1105 | ||
1106 | cf->data[6] = txerr; | |
1107 | cf->data[7] = rxerr; | |
1108 | } | |
1109 | ||
1110 | if (state != mod->can.state && (state == CAN_STATE_ERROR_WARNING || | |
1111 | state == CAN_STATE_ERROR_PASSIVE)) { | |
1112 | cf->can_id |= CAN_ERR_CRTL; | |
1113 | if (state == CAN_STATE_ERROR_WARNING) { | |
1114 | mod->can.can_stats.error_warning++; | |
1115 | cf->data[1] = (txerr > rxerr) ? | |
1116 | CAN_ERR_CRTL_TX_WARNING : | |
1117 | CAN_ERR_CRTL_RX_WARNING; | |
1118 | } else { | |
1119 | mod->can.can_stats.error_passive++; | |
1120 | cf->data[1] = (txerr > rxerr) ? | |
1121 | CAN_ERR_CRTL_TX_PASSIVE : | |
1122 | CAN_ERR_CRTL_RX_PASSIVE; | |
1123 | } | |
1124 | ||
1125 | cf->data[6] = txerr; | |
1126 | cf->data[7] = rxerr; | |
1127 | } | |
1128 | ||
1129 | mod->can.state = state; | |
631eb227 IS |
1130 | netif_rx(skb); |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | static void ican3_handle_inquiry(struct ican3_dev *mod, struct ican3_msg *msg) | |
1135 | { | |
1136 | switch (msg->data[0]) { | |
1137 | case INQUIRY_STATUS: | |
1138 | case INQUIRY_EXTENDED: | |
1139 | mod->bec.rxerr = msg->data[5]; | |
1140 | mod->bec.txerr = msg->data[6]; | |
1141 | complete(&mod->buserror_comp); | |
1142 | break; | |
1143 | case INQUIRY_TERMINATION: | |
1144 | mod->termination_enabled = msg->data[6] & HWCONF_TERMINATE_ON; | |
1145 | complete(&mod->termination_comp); | |
1146 | break; | |
1147 | default: | |
a8ca2efc | 1148 | netdev_err(mod->ndev, "received an unknown inquiry response\n"); |
631eb227 IS |
1149 | break; |
1150 | } | |
1151 | } | |
1152 | ||
1153 | static void ican3_handle_unknown_message(struct ican3_dev *mod, | |
1154 | struct ican3_msg *msg) | |
1155 | { | |
a8ca2efc | 1156 | netdev_warn(mod->ndev, "received unknown message: spec 0x%.2x length %d\n", |
631eb227 IS |
1157 | msg->spec, le16_to_cpu(msg->len)); |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Handle a control message from the firmware | |
1162 | */ | |
1163 | static void ican3_handle_message(struct ican3_dev *mod, struct ican3_msg *msg) | |
1164 | { | |
a8ca2efc | 1165 | netdev_dbg(mod->ndev, "%s: modno %d spec 0x%.2x len %d bytes\n", __func__, |
631eb227 IS |
1166 | mod->num, msg->spec, le16_to_cpu(msg->len)); |
1167 | ||
1168 | switch (msg->spec) { | |
1169 | case MSG_IDVERS: | |
1170 | ican3_handle_idvers(mod, msg); | |
1171 | break; | |
1172 | case MSG_MSGLOST: | |
1173 | case MSG_FMSGLOST: | |
1174 | ican3_handle_msglost(mod, msg); | |
1175 | break; | |
1176 | case MSG_CEVTIND: | |
1177 | ican3_handle_cevtind(mod, msg); | |
1178 | break; | |
1179 | case MSG_INQUIRY: | |
1180 | ican3_handle_inquiry(mod, msg); | |
1181 | break; | |
1182 | default: | |
1183 | ican3_handle_unknown_message(mod, msg); | |
1184 | break; | |
1185 | } | |
1186 | } | |
1187 | ||
83702f69 IS |
1188 | /* |
1189 | * The ican3 needs to store all echo skbs, and therefore cannot | |
1190 | * use the generic infrastructure for this. | |
1191 | */ | |
1192 | static void ican3_put_echo_skb(struct ican3_dev *mod, struct sk_buff *skb) | |
1193 | { | |
0ae89beb OH |
1194 | skb = can_create_echo_skb(skb); |
1195 | if (!skb) | |
1196 | return; | |
83702f69 IS |
1197 | |
1198 | /* save this skb for tx interrupt echo handling */ | |
1199 | skb_queue_tail(&mod->echoq, skb); | |
1200 | } | |
1201 | ||
1202 | static unsigned int ican3_get_echo_skb(struct ican3_dev *mod) | |
1203 | { | |
1204 | struct sk_buff *skb = skb_dequeue(&mod->echoq); | |
1205 | struct can_frame *cf; | |
1206 | u8 dlc; | |
1207 | ||
1208 | /* this should never trigger unless there is a driver bug */ | |
1209 | if (!skb) { | |
1210 | netdev_err(mod->ndev, "BUG: echo skb not occupied\n"); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | cf = (struct can_frame *)skb->data; | |
1215 | dlc = cf->can_dlc; | |
1216 | ||
1217 | /* check flag whether this packet has to be looped back */ | |
1218 | if (skb->pkt_type != PACKET_LOOPBACK) { | |
1219 | kfree_skb(skb); | |
1220 | return dlc; | |
1221 | } | |
1222 | ||
1223 | skb->protocol = htons(ETH_P_CAN); | |
1224 | skb->pkt_type = PACKET_BROADCAST; | |
1225 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1226 | skb->dev = mod->ndev; | |
1227 | netif_receive_skb(skb); | |
1228 | return dlc; | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * Compare an skb with an existing echo skb | |
1233 | * | |
1234 | * This function will be used on devices which have a hardware loopback. | |
1235 | * On these devices, this function can be used to compare a received skb | |
1236 | * with the saved echo skbs so that the hardware echo skb can be dropped. | |
1237 | * | |
1238 | * Returns true if the skb's are identical, false otherwise. | |
1239 | */ | |
1240 | static bool ican3_echo_skb_matches(struct ican3_dev *mod, struct sk_buff *skb) | |
1241 | { | |
1242 | struct can_frame *cf = (struct can_frame *)skb->data; | |
1243 | struct sk_buff *echo_skb = skb_peek(&mod->echoq); | |
1244 | struct can_frame *echo_cf; | |
1245 | ||
1246 | if (!echo_skb) | |
1247 | return false; | |
1248 | ||
1249 | echo_cf = (struct can_frame *)echo_skb->data; | |
1250 | if (cf->can_id != echo_cf->can_id) | |
1251 | return false; | |
1252 | ||
1253 | if (cf->can_dlc != echo_cf->can_dlc) | |
1254 | return false; | |
1255 | ||
1256 | return memcmp(cf->data, echo_cf->data, cf->can_dlc) == 0; | |
1257 | } | |
1258 | ||
631eb227 IS |
1259 | /* |
1260 | * Check that there is room in the TX ring to transmit another skb | |
1261 | * | |
1262 | * LOCKING: must hold mod->lock | |
1263 | */ | |
1264 | static bool ican3_txok(struct ican3_dev *mod) | |
1265 | { | |
1266 | struct ican3_fast_desc __iomem *desc; | |
1267 | u8 control; | |
1268 | ||
83702f69 IS |
1269 | /* check that we have echo queue space */ |
1270 | if (skb_queue_len(&mod->echoq) >= ICAN3_TX_BUFFERS) | |
1271 | return false; | |
1272 | ||
631eb227 IS |
1273 | /* copy the control bits of the descriptor */ |
1274 | ican3_set_page(mod, mod->fasttx_start + (mod->fasttx_num / 16)); | |
1275 | desc = mod->dpm + ((mod->fasttx_num % 16) * sizeof(*desc)); | |
1276 | control = ioread8(&desc->control); | |
1277 | ||
1278 | /* if the control bits are not valid, then we have no more space */ | |
1279 | if (!(control & DESC_VALID)) | |
1280 | return false; | |
1281 | ||
1282 | return true; | |
1283 | } | |
1284 | ||
1285 | /* | |
25985edc | 1286 | * Receive one CAN frame from the hardware |
631eb227 | 1287 | * |
631eb227 IS |
1288 | * CONTEXT: must be called from user context |
1289 | */ | |
1290 | static int ican3_recv_skb(struct ican3_dev *mod) | |
1291 | { | |
1292 | struct net_device *ndev = mod->ndev; | |
1293 | struct net_device_stats *stats = &ndev->stats; | |
1294 | struct ican3_fast_desc desc; | |
1295 | void __iomem *desc_addr; | |
1296 | struct can_frame *cf; | |
1297 | struct sk_buff *skb; | |
1298 | unsigned long flags; | |
1299 | ||
1300 | spin_lock_irqsave(&mod->lock, flags); | |
1301 | ||
1302 | /* copy the whole descriptor */ | |
1303 | ican3_set_page(mod, mod->fastrx_start + (mod->fastrx_num / 16)); | |
1304 | desc_addr = mod->dpm + ((mod->fastrx_num % 16) * sizeof(desc)); | |
1305 | memcpy_fromio(&desc, desc_addr, sizeof(desc)); | |
1306 | ||
1307 | spin_unlock_irqrestore(&mod->lock, flags); | |
1308 | ||
1309 | /* check that we actually have a CAN frame */ | |
1310 | if (!(desc.control & DESC_VALID)) | |
1311 | return -ENOBUFS; | |
1312 | ||
1313 | /* allocate an skb */ | |
1314 | skb = alloc_can_skb(ndev, &cf); | |
1315 | if (unlikely(skb == NULL)) { | |
1316 | stats->rx_dropped++; | |
1317 | goto err_noalloc; | |
1318 | } | |
1319 | ||
1320 | /* convert the ICAN3 frame into Linux CAN format */ | |
1321 | ican3_to_can_frame(mod, &desc, cf); | |
1322 | ||
83702f69 IS |
1323 | /* |
1324 | * If this is an ECHO frame received from the hardware loopback | |
1325 | * feature, use the skb saved in the ECHO stack instead. This allows | |
1326 | * the Linux CAN core to support CAN_RAW_RECV_OWN_MSGS correctly. | |
1327 | * | |
1328 | * Since this is a confirmation of a successfully transmitted packet | |
1329 | * sent from this host, update the transmit statistics. | |
1330 | * | |
1331 | * Also, the netdevice queue needs to be allowed to send packets again. | |
1332 | */ | |
1333 | if (ican3_echo_skb_matches(mod, skb)) { | |
1334 | stats->tx_packets++; | |
1335 | stats->tx_bytes += ican3_get_echo_skb(mod); | |
1336 | kfree_skb(skb); | |
1337 | goto err_noalloc; | |
1338 | } | |
1339 | ||
1340 | /* update statistics, receive the skb */ | |
631eb227 IS |
1341 | stats->rx_packets++; |
1342 | stats->rx_bytes += cf->can_dlc; | |
83702f69 | 1343 | netif_receive_skb(skb); |
631eb227 IS |
1344 | |
1345 | err_noalloc: | |
1346 | /* toggle the valid bit and return the descriptor to the ring */ | |
1347 | desc.control ^= DESC_VALID; | |
1348 | ||
1349 | spin_lock_irqsave(&mod->lock, flags); | |
1350 | ||
1351 | ican3_set_page(mod, mod->fastrx_start + (mod->fastrx_num / 16)); | |
1352 | memcpy_toio(desc_addr, &desc, 1); | |
1353 | ||
1354 | /* update the next buffer pointer */ | |
1355 | mod->fastrx_num = (desc.control & DESC_WRAP) ? 0 | |
1356 | : (mod->fastrx_num + 1); | |
1357 | ||
1358 | /* there are still more buffers to process */ | |
1359 | spin_unlock_irqrestore(&mod->lock, flags); | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | static int ican3_napi(struct napi_struct *napi, int budget) | |
1364 | { | |
1365 | struct ican3_dev *mod = container_of(napi, struct ican3_dev, napi); | |
631eb227 IS |
1366 | unsigned long flags; |
1367 | int received = 0; | |
1368 | int ret; | |
1369 | ||
1370 | /* process all communication messages */ | |
1371 | while (true) { | |
73615c86 | 1372 | struct ican3_msg uninitialized_var(msg); |
631eb227 IS |
1373 | ret = ican3_recv_msg(mod, &msg); |
1374 | if (ret) | |
1375 | break; | |
1376 | ||
1377 | ican3_handle_message(mod, &msg); | |
1378 | } | |
1379 | ||
1380 | /* process all CAN frames from the fast interface */ | |
1381 | while (received < budget) { | |
1382 | ret = ican3_recv_skb(mod); | |
1383 | if (ret) | |
1384 | break; | |
1385 | ||
1386 | received++; | |
1387 | } | |
1388 | ||
1389 | /* We have processed all packets that the adapter had, but it | |
1390 | * was less than our budget, stop polling */ | |
1391 | if (received < budget) | |
1392 | napi_complete(napi); | |
1393 | ||
1394 | spin_lock_irqsave(&mod->lock, flags); | |
1395 | ||
1396 | /* Wake up the transmit queue if necessary */ | |
1397 | if (netif_queue_stopped(mod->ndev) && ican3_txok(mod)) | |
1398 | netif_wake_queue(mod->ndev); | |
1399 | ||
1400 | spin_unlock_irqrestore(&mod->lock, flags); | |
1401 | ||
1402 | /* re-enable interrupt generation */ | |
1403 | iowrite8(1 << mod->num, &mod->ctrl->int_enable); | |
1404 | return received; | |
1405 | } | |
1406 | ||
1407 | static irqreturn_t ican3_irq(int irq, void *dev_id) | |
1408 | { | |
1409 | struct ican3_dev *mod = dev_id; | |
1410 | u8 stat; | |
1411 | ||
1412 | /* | |
1413 | * The interrupt status register on this device reports interrupts | |
1414 | * as zeroes instead of using ones like most other devices | |
1415 | */ | |
1416 | stat = ioread8(&mod->ctrl->int_disable) & (1 << mod->num); | |
1417 | if (stat == (1 << mod->num)) | |
1418 | return IRQ_NONE; | |
1419 | ||
1420 | /* clear the MODULbus interrupt from the microcontroller */ | |
1421 | ioread8(&mod->dpmctrl->interrupt); | |
1422 | ||
1423 | /* disable interrupt generation, schedule the NAPI poller */ | |
1424 | iowrite8(1 << mod->num, &mod->ctrl->int_disable); | |
1425 | napi_schedule(&mod->napi); | |
1426 | return IRQ_HANDLED; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * Firmware reset, startup, and shutdown | |
1431 | */ | |
1432 | ||
1433 | /* | |
1434 | * Reset an ICAN module to its power-on state | |
1435 | * | |
1436 | * CONTEXT: no network device registered | |
631eb227 IS |
1437 | */ |
1438 | static int ican3_reset_module(struct ican3_dev *mod) | |
1439 | { | |
631eb227 IS |
1440 | unsigned long start; |
1441 | u8 runold, runnew; | |
1442 | ||
1443 | /* disable interrupts so no more work is scheduled */ | |
1444 | iowrite8(1 << mod->num, &mod->ctrl->int_disable); | |
1445 | ||
631eb227 IS |
1446 | /* the first unallocated page in the DPM is #9 */ |
1447 | mod->free_page = DPM_FREE_START; | |
1448 | ||
1449 | ican3_set_page(mod, QUEUE_OLD_CONTROL); | |
1450 | runold = ioread8(mod->dpm + TARGET_RUNNING); | |
1451 | ||
1452 | /* reset the module */ | |
e21093ef | 1453 | iowrite8(0x00, &mod->dpmctrl->hwreset); |
631eb227 IS |
1454 | |
1455 | /* wait until the module has finished resetting and is running */ | |
1456 | start = jiffies; | |
1457 | do { | |
1458 | ican3_set_page(mod, QUEUE_OLD_CONTROL); | |
1459 | runnew = ioread8(mod->dpm + TARGET_RUNNING); | |
1460 | if (runnew == (runold ^ 0xff)) | |
1461 | return 0; | |
1462 | ||
1463 | msleep(10); | |
844e0edf | 1464 | } while (time_before(jiffies, start + HZ / 2)); |
631eb227 | 1465 | |
a8ca2efc | 1466 | netdev_err(mod->ndev, "failed to reset CAN module\n"); |
631eb227 IS |
1467 | return -ETIMEDOUT; |
1468 | } | |
1469 | ||
3c8ac0f2 | 1470 | static void ican3_shutdown_module(struct ican3_dev *mod) |
631eb227 IS |
1471 | { |
1472 | ican3_msg_disconnect(mod); | |
1473 | ican3_reset_module(mod); | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * Startup an ICAN module, bringing it into fast mode | |
1478 | */ | |
3c8ac0f2 | 1479 | static int ican3_startup_module(struct ican3_dev *mod) |
631eb227 IS |
1480 | { |
1481 | int ret; | |
1482 | ||
1483 | ret = ican3_reset_module(mod); | |
1484 | if (ret) { | |
a8ca2efc | 1485 | netdev_err(mod->ndev, "unable to reset module\n"); |
631eb227 IS |
1486 | return ret; |
1487 | } | |
1488 | ||
844e0edf AG |
1489 | /* detect firmware */ |
1490 | memcpy_fromio(mod->fwinfo, mod->dpm + FIRMWARE_STAMP, sizeof(mod->fwinfo) - 1); | |
1491 | if (strncmp(mod->fwinfo, "JANZ-ICAN3", 10)) { | |
1492 | netdev_err(mod->ndev, "ICAN3 not detected (found %s)\n", mod->fwinfo); | |
1493 | return -ENODEV; | |
1494 | } | |
1495 | if (strstr(mod->fwinfo, "CAL/CANopen")) | |
1496 | mod->fwtype = ICAN3_FWTYPE_CAL_CANOPEN; | |
1497 | else | |
1498 | mod->fwtype = ICAN3_FWTYPE_ICANOS; | |
1499 | ||
631eb227 IS |
1500 | /* re-enable interrupts so we can send messages */ |
1501 | iowrite8(1 << mod->num, &mod->ctrl->int_enable); | |
1502 | ||
1503 | ret = ican3_msg_connect(mod); | |
1504 | if (ret) { | |
a8ca2efc | 1505 | netdev_err(mod->ndev, "unable to connect to module\n"); |
631eb227 IS |
1506 | return ret; |
1507 | } | |
1508 | ||
1509 | ican3_init_new_host_interface(mod); | |
1510 | ret = ican3_msg_newhostif(mod); | |
1511 | if (ret) { | |
a8ca2efc | 1512 | netdev_err(mod->ndev, "unable to switch to new-style interface\n"); |
631eb227 IS |
1513 | return ret; |
1514 | } | |
1515 | ||
1516 | /* default to "termination on" */ | |
1517 | ret = ican3_set_termination(mod, true); | |
1518 | if (ret) { | |
a8ca2efc | 1519 | netdev_err(mod->ndev, "unable to enable termination\n"); |
631eb227 IS |
1520 | return ret; |
1521 | } | |
1522 | ||
1523 | /* default to "bus errors enabled" */ | |
30df5888 | 1524 | ret = ican3_set_buserror(mod, 1); |
631eb227 | 1525 | if (ret) { |
a8ca2efc | 1526 | netdev_err(mod->ndev, "unable to set bus-error\n"); |
631eb227 IS |
1527 | return ret; |
1528 | } | |
1529 | ||
1530 | ican3_init_fast_host_interface(mod); | |
1531 | ret = ican3_msg_fasthostif(mod); | |
1532 | if (ret) { | |
a8ca2efc | 1533 | netdev_err(mod->ndev, "unable to switch to fast host interface\n"); |
631eb227 IS |
1534 | return ret; |
1535 | } | |
1536 | ||
1537 | ret = ican3_set_id_filter(mod, true); | |
1538 | if (ret) { | |
a8ca2efc | 1539 | netdev_err(mod->ndev, "unable to set acceptance filter\n"); |
631eb227 IS |
1540 | return ret; |
1541 | } | |
1542 | ||
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * CAN Network Device | |
1548 | */ | |
1549 | ||
1550 | static int ican3_open(struct net_device *ndev) | |
1551 | { | |
1552 | struct ican3_dev *mod = netdev_priv(ndev); | |
631eb227 IS |
1553 | int ret; |
1554 | ||
1555 | /* open the CAN layer */ | |
1556 | ret = open_candev(ndev); | |
1557 | if (ret) { | |
a8ca2efc | 1558 | netdev_err(mod->ndev, "unable to start CAN layer\n"); |
631eb227 IS |
1559 | return ret; |
1560 | } | |
1561 | ||
631eb227 IS |
1562 | /* bring the bus online */ |
1563 | ret = ican3_set_bus_state(mod, true); | |
1564 | if (ret) { | |
a8ca2efc | 1565 | netdev_err(mod->ndev, "unable to set bus-on\n"); |
631eb227 IS |
1566 | close_candev(ndev); |
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | /* start up the network device */ | |
1571 | mod->can.state = CAN_STATE_ERROR_ACTIVE; | |
1572 | netif_start_queue(ndev); | |
1573 | ||
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | static int ican3_stop(struct net_device *ndev) | |
1578 | { | |
1579 | struct ican3_dev *mod = netdev_priv(ndev); | |
1580 | int ret; | |
1581 | ||
1582 | /* stop the network device xmit routine */ | |
1583 | netif_stop_queue(ndev); | |
1584 | mod->can.state = CAN_STATE_STOPPED; | |
1585 | ||
1586 | /* bring the bus offline, stop receiving packets */ | |
1587 | ret = ican3_set_bus_state(mod, false); | |
1588 | if (ret) { | |
a8ca2efc | 1589 | netdev_err(mod->ndev, "unable to set bus-off\n"); |
631eb227 IS |
1590 | return ret; |
1591 | } | |
1592 | ||
83702f69 IS |
1593 | /* drop all outstanding echo skbs */ |
1594 | skb_queue_purge(&mod->echoq); | |
1595 | ||
631eb227 IS |
1596 | /* close the CAN layer */ |
1597 | close_candev(ndev); | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev) | |
1602 | { | |
1603 | struct ican3_dev *mod = netdev_priv(ndev); | |
631eb227 IS |
1604 | struct can_frame *cf = (struct can_frame *)skb->data; |
1605 | struct ican3_fast_desc desc; | |
1606 | void __iomem *desc_addr; | |
1607 | unsigned long flags; | |
1608 | ||
007890d7 IS |
1609 | if (can_dropped_invalid_skb(ndev, skb)) |
1610 | return NETDEV_TX_OK; | |
1611 | ||
631eb227 IS |
1612 | spin_lock_irqsave(&mod->lock, flags); |
1613 | ||
1614 | /* check that we can actually transmit */ | |
1615 | if (!ican3_txok(mod)) { | |
a8ca2efc | 1616 | netdev_err(mod->ndev, "BUG: no free descriptors\n"); |
631eb227 IS |
1617 | spin_unlock_irqrestore(&mod->lock, flags); |
1618 | return NETDEV_TX_BUSY; | |
1619 | } | |
1620 | ||
1621 | /* copy the control bits of the descriptor */ | |
1622 | ican3_set_page(mod, mod->fasttx_start + (mod->fasttx_num / 16)); | |
1623 | desc_addr = mod->dpm + ((mod->fasttx_num % 16) * sizeof(desc)); | |
1624 | memset(&desc, 0, sizeof(desc)); | |
1625 | memcpy_fromio(&desc, desc_addr, 1); | |
1626 | ||
1627 | /* convert the Linux CAN frame into ICAN3 format */ | |
1628 | can_frame_to_ican3(mod, cf, &desc); | |
1629 | ||
83702f69 IS |
1630 | /* |
1631 | * This hardware doesn't have TX-done notifications, so we'll try and | |
1632 | * emulate it the best we can using ECHO skbs. Add the skb to the ECHO | |
1633 | * stack. Upon packet reception, check if the ECHO skb and received | |
1634 | * skb match, and use that to wake the queue. | |
1635 | */ | |
1636 | ican3_put_echo_skb(mod, skb); | |
1637 | ||
631eb227 IS |
1638 | /* |
1639 | * the programming manual says that you must set the IVALID bit, then | |
1640 | * interrupt, then set the valid bit. Quite weird, but it seems to be | |
1641 | * required for this to work | |
1642 | */ | |
1643 | desc.control |= DESC_IVALID; | |
1644 | memcpy_toio(desc_addr, &desc, sizeof(desc)); | |
1645 | ||
1646 | /* generate a MODULbus interrupt to the microcontroller */ | |
1647 | iowrite8(0x01, &mod->dpmctrl->interrupt); | |
1648 | ||
1649 | desc.control ^= DESC_VALID; | |
1650 | memcpy_toio(desc_addr, &desc, sizeof(desc)); | |
1651 | ||
1652 | /* update the next buffer pointer */ | |
1653 | mod->fasttx_num = (desc.control & DESC_WRAP) ? 0 | |
1654 | : (mod->fasttx_num + 1); | |
1655 | ||
83702f69 | 1656 | /* if there is no free descriptor space, stop the transmit queue */ |
631eb227 IS |
1657 | if (!ican3_txok(mod)) |
1658 | netif_stop_queue(ndev); | |
1659 | ||
1660 | spin_unlock_irqrestore(&mod->lock, flags); | |
1661 | return NETDEV_TX_OK; | |
1662 | } | |
1663 | ||
1664 | static const struct net_device_ops ican3_netdev_ops = { | |
1665 | .ndo_open = ican3_open, | |
1666 | .ndo_stop = ican3_stop, | |
1667 | .ndo_start_xmit = ican3_xmit, | |
c971fa2a | 1668 | .ndo_change_mtu = can_change_mtu, |
631eb227 IS |
1669 | }; |
1670 | ||
1671 | /* | |
1672 | * Low-level CAN Device | |
1673 | */ | |
1674 | ||
1675 | /* This structure was stolen from drivers/net/can/sja1000/sja1000.c */ | |
194b9a4c | 1676 | static const struct can_bittiming_const ican3_bittiming_const = { |
631eb227 IS |
1677 | .name = DRV_NAME, |
1678 | .tseg1_min = 1, | |
1679 | .tseg1_max = 16, | |
1680 | .tseg2_min = 1, | |
1681 | .tseg2_max = 8, | |
1682 | .sjw_max = 4, | |
1683 | .brp_min = 1, | |
1684 | .brp_max = 64, | |
1685 | .brp_inc = 1, | |
1686 | }; | |
1687 | ||
631eb227 IS |
1688 | static int ican3_set_mode(struct net_device *ndev, enum can_mode mode) |
1689 | { | |
1690 | struct ican3_dev *mod = netdev_priv(ndev); | |
1691 | int ret; | |
1692 | ||
1693 | if (mode != CAN_MODE_START) | |
1694 | return -ENOTSUPP; | |
1695 | ||
1696 | /* bring the bus online */ | |
1697 | ret = ican3_set_bus_state(mod, true); | |
1698 | if (ret) { | |
a8ca2efc | 1699 | netdev_err(ndev, "unable to set bus-on\n"); |
631eb227 IS |
1700 | return ret; |
1701 | } | |
1702 | ||
1703 | /* start up the network device */ | |
1704 | mod->can.state = CAN_STATE_ERROR_ACTIVE; | |
1705 | ||
1706 | if (netif_queue_stopped(ndev)) | |
1707 | netif_wake_queue(ndev); | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | static int ican3_get_berr_counter(const struct net_device *ndev, | |
1713 | struct can_berr_counter *bec) | |
1714 | { | |
1715 | struct ican3_dev *mod = netdev_priv(ndev); | |
1716 | int ret; | |
1717 | ||
1718 | ret = ican3_send_inquiry(mod, INQUIRY_STATUS); | |
1719 | if (ret) | |
1720 | return ret; | |
1721 | ||
8a00785e | 1722 | if (!wait_for_completion_timeout(&mod->buserror_comp, HZ)) { |
a8ca2efc | 1723 | netdev_info(mod->ndev, "%s timed out\n", __func__); |
631eb227 IS |
1724 | return -ETIMEDOUT; |
1725 | } | |
1726 | ||
1727 | bec->rxerr = mod->bec.rxerr; | |
1728 | bec->txerr = mod->bec.txerr; | |
1729 | return 0; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * Sysfs Attributes | |
1734 | */ | |
1735 | ||
1736 | static ssize_t ican3_sysfs_show_term(struct device *dev, | |
1737 | struct device_attribute *attr, | |
1738 | char *buf) | |
1739 | { | |
1740 | struct ican3_dev *mod = netdev_priv(to_net_dev(dev)); | |
1741 | int ret; | |
1742 | ||
1743 | ret = ican3_send_inquiry(mod, INQUIRY_TERMINATION); | |
1744 | if (ret) | |
1745 | return ret; | |
1746 | ||
8a00785e | 1747 | if (!wait_for_completion_timeout(&mod->termination_comp, HZ)) { |
a8ca2efc | 1748 | netdev_info(mod->ndev, "%s timed out\n", __func__); |
631eb227 IS |
1749 | return -ETIMEDOUT; |
1750 | } | |
1751 | ||
1752 | return snprintf(buf, PAGE_SIZE, "%u\n", mod->termination_enabled); | |
1753 | } | |
1754 | ||
1755 | static ssize_t ican3_sysfs_set_term(struct device *dev, | |
1756 | struct device_attribute *attr, | |
1757 | const char *buf, size_t count) | |
1758 | { | |
1759 | struct ican3_dev *mod = netdev_priv(to_net_dev(dev)); | |
1760 | unsigned long enable; | |
1761 | int ret; | |
1762 | ||
0672f0ab | 1763 | if (kstrtoul(buf, 0, &enable)) |
631eb227 IS |
1764 | return -EINVAL; |
1765 | ||
1766 | ret = ican3_set_termination(mod, enable); | |
1767 | if (ret) | |
1768 | return ret; | |
1769 | ||
1770 | return count; | |
1771 | } | |
1772 | ||
844e0edf AG |
1773 | static ssize_t ican3_sysfs_show_fwinfo(struct device *dev, |
1774 | struct device_attribute *attr, | |
1775 | char *buf) | |
1776 | { | |
1777 | struct ican3_dev *mod = netdev_priv(to_net_dev(dev)); | |
1778 | ||
1779 | return scnprintf(buf, PAGE_SIZE, "%s\n", mod->fwinfo); | |
1780 | } | |
1781 | ||
1e6d93e4 | 1782 | static DEVICE_ATTR(termination, S_IWUSR | S_IRUGO, ican3_sysfs_show_term, |
631eb227 | 1783 | ican3_sysfs_set_term); |
844e0edf | 1784 | static DEVICE_ATTR(fwinfo, S_IRUSR | S_IRUGO, ican3_sysfs_show_fwinfo, NULL); |
631eb227 IS |
1785 | |
1786 | static struct attribute *ican3_sysfs_attrs[] = { | |
1787 | &dev_attr_termination.attr, | |
844e0edf | 1788 | &dev_attr_fwinfo.attr, |
631eb227 IS |
1789 | NULL, |
1790 | }; | |
1791 | ||
1792 | static struct attribute_group ican3_sysfs_attr_group = { | |
1793 | .attrs = ican3_sysfs_attrs, | |
1794 | }; | |
1795 | ||
1796 | /* | |
1797 | * PCI Subsystem | |
1798 | */ | |
1799 | ||
3c8ac0f2 | 1800 | static int ican3_probe(struct platform_device *pdev) |
631eb227 IS |
1801 | { |
1802 | struct janz_platform_data *pdata; | |
1803 | struct net_device *ndev; | |
1804 | struct ican3_dev *mod; | |
1805 | struct resource *res; | |
1806 | struct device *dev; | |
1807 | int ret; | |
1808 | ||
c91a319c | 1809 | pdata = dev_get_platdata(&pdev->dev); |
631eb227 IS |
1810 | if (!pdata) |
1811 | return -ENXIO; | |
1812 | ||
1813 | dev_dbg(&pdev->dev, "probe: module number %d\n", pdata->modno); | |
1814 | ||
1815 | /* save the struct device for printing */ | |
1816 | dev = &pdev->dev; | |
1817 | ||
1818 | /* allocate the CAN device and private data */ | |
1819 | ndev = alloc_candev(sizeof(*mod), 0); | |
1820 | if (!ndev) { | |
1821 | dev_err(dev, "unable to allocate CANdev\n"); | |
1822 | ret = -ENOMEM; | |
1823 | goto out_return; | |
1824 | } | |
1825 | ||
1826 | platform_set_drvdata(pdev, ndev); | |
1827 | mod = netdev_priv(ndev); | |
1828 | mod->ndev = ndev; | |
631eb227 IS |
1829 | mod->num = pdata->modno; |
1830 | netif_napi_add(ndev, &mod->napi, ican3_napi, ICAN3_RX_BUFFERS); | |
83702f69 | 1831 | skb_queue_head_init(&mod->echoq); |
631eb227 IS |
1832 | spin_lock_init(&mod->lock); |
1833 | init_completion(&mod->termination_comp); | |
1834 | init_completion(&mod->buserror_comp); | |
1835 | ||
1836 | /* setup device-specific sysfs attributes */ | |
1837 | ndev->sysfs_groups[0] = &ican3_sysfs_attr_group; | |
1838 | ||
1839 | /* the first unallocated page in the DPM is 9 */ | |
1840 | mod->free_page = DPM_FREE_START; | |
1841 | ||
1842 | ndev->netdev_ops = &ican3_netdev_ops; | |
1843 | ndev->flags |= IFF_ECHO; | |
1844 | SET_NETDEV_DEV(ndev, &pdev->dev); | |
1845 | ||
1846 | mod->can.clock.freq = ICAN3_CAN_CLOCK; | |
1847 | mod->can.bittiming_const = &ican3_bittiming_const; | |
631eb227 IS |
1848 | mod->can.do_set_mode = ican3_set_mode; |
1849 | mod->can.do_get_berr_counter = ican3_get_berr_counter; | |
1850 | mod->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | |
3b5c6b9e IS |
1851 | | CAN_CTRLMODE_BERR_REPORTING |
1852 | | CAN_CTRLMODE_ONE_SHOT; | |
631eb227 IS |
1853 | |
1854 | /* find our IRQ number */ | |
1855 | mod->irq = platform_get_irq(pdev, 0); | |
1856 | if (mod->irq < 0) { | |
1857 | dev_err(dev, "IRQ line not found\n"); | |
1858 | ret = -ENODEV; | |
1859 | goto out_free_ndev; | |
1860 | } | |
1861 | ||
1862 | ndev->irq = mod->irq; | |
1863 | ||
1864 | /* get access to the MODULbus registers for this module */ | |
1865 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1866 | if (!res) { | |
1867 | dev_err(dev, "MODULbus registers not found\n"); | |
1868 | ret = -ENODEV; | |
1869 | goto out_free_ndev; | |
1870 | } | |
1871 | ||
1872 | mod->dpm = ioremap(res->start, resource_size(res)); | |
1873 | if (!mod->dpm) { | |
1874 | dev_err(dev, "MODULbus registers not ioremap\n"); | |
1875 | ret = -ENOMEM; | |
1876 | goto out_free_ndev; | |
1877 | } | |
1878 | ||
1879 | mod->dpmctrl = mod->dpm + DPM_PAGE_SIZE; | |
1880 | ||
1881 | /* get access to the control registers for this module */ | |
1882 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
1883 | if (!res) { | |
1884 | dev_err(dev, "CONTROL registers not found\n"); | |
1885 | ret = -ENODEV; | |
1886 | goto out_iounmap_dpm; | |
1887 | } | |
1888 | ||
1889 | mod->ctrl = ioremap(res->start, resource_size(res)); | |
1890 | if (!mod->ctrl) { | |
1891 | dev_err(dev, "CONTROL registers not ioremap\n"); | |
1892 | ret = -ENOMEM; | |
1893 | goto out_iounmap_dpm; | |
1894 | } | |
1895 | ||
1896 | /* disable our IRQ, then hookup the IRQ handler */ | |
1897 | iowrite8(1 << mod->num, &mod->ctrl->int_disable); | |
1898 | ret = request_irq(mod->irq, ican3_irq, IRQF_SHARED, DRV_NAME, mod); | |
1899 | if (ret) { | |
1900 | dev_err(dev, "unable to request IRQ\n"); | |
1901 | goto out_iounmap_ctrl; | |
1902 | } | |
1903 | ||
1904 | /* reset and initialize the CAN controller into fast mode */ | |
1905 | napi_enable(&mod->napi); | |
1906 | ret = ican3_startup_module(mod); | |
1907 | if (ret) { | |
1908 | dev_err(dev, "%s: unable to start CANdev\n", __func__); | |
1909 | goto out_free_irq; | |
1910 | } | |
1911 | ||
1912 | /* register with the Linux CAN layer */ | |
1913 | ret = register_candev(ndev); | |
1914 | if (ret) { | |
1915 | dev_err(dev, "%s: unable to register CANdev\n", __func__); | |
1916 | goto out_free_irq; | |
1917 | } | |
1918 | ||
844e0edf | 1919 | netdev_info(mod->ndev, "module %d: registered CAN device\n", pdata->modno); |
631eb227 IS |
1920 | return 0; |
1921 | ||
1922 | out_free_irq: | |
1923 | napi_disable(&mod->napi); | |
1924 | iowrite8(1 << mod->num, &mod->ctrl->int_disable); | |
1925 | free_irq(mod->irq, mod); | |
1926 | out_iounmap_ctrl: | |
1927 | iounmap(mod->ctrl); | |
1928 | out_iounmap_dpm: | |
1929 | iounmap(mod->dpm); | |
1930 | out_free_ndev: | |
1931 | free_candev(ndev); | |
1932 | out_return: | |
1933 | return ret; | |
1934 | } | |
1935 | ||
3c8ac0f2 | 1936 | static int ican3_remove(struct platform_device *pdev) |
631eb227 IS |
1937 | { |
1938 | struct net_device *ndev = platform_get_drvdata(pdev); | |
1939 | struct ican3_dev *mod = netdev_priv(ndev); | |
1940 | ||
1941 | /* unregister the netdevice, stop interrupts */ | |
1942 | unregister_netdev(ndev); | |
1943 | napi_disable(&mod->napi); | |
1944 | iowrite8(1 << mod->num, &mod->ctrl->int_disable); | |
1945 | free_irq(mod->irq, mod); | |
1946 | ||
1947 | /* put the module into reset */ | |
1948 | ican3_shutdown_module(mod); | |
1949 | ||
1950 | /* unmap all registers */ | |
1951 | iounmap(mod->ctrl); | |
1952 | iounmap(mod->dpm); | |
1953 | ||
1954 | free_candev(ndev); | |
1955 | ||
1956 | return 0; | |
1957 | } | |
1958 | ||
1959 | static struct platform_driver ican3_driver = { | |
1960 | .driver = { | |
1961 | .name = DRV_NAME, | |
631eb227 IS |
1962 | }, |
1963 | .probe = ican3_probe, | |
3c8ac0f2 | 1964 | .remove = ican3_remove, |
631eb227 IS |
1965 | }; |
1966 | ||
871d3372 | 1967 | module_platform_driver(ican3_driver); |
631eb227 IS |
1968 | |
1969 | MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>"); | |
1970 | MODULE_DESCRIPTION("Janz MODULbus VMOD-ICAN3 Driver"); | |
1971 | MODULE_LICENSE("GPL"); | |
1972 | MODULE_ALIAS("platform:janz-ican3"); |