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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Marvell 88E6xxx VLAN [Spanning Tree] Translation Unit (VTU [STU]) support
4 *
5 * Copyright (c) 2008 Marvell Semiconductor
6 * Copyright (c) 2015 CMC Electronics, Inc.
7 * Copyright (c) 2017 Savoir-faire Linux, Inc.
8 */
9
10#include <linux/bitfield.h>
11#include <linux/interrupt.h>
12#include <linux/irqdomain.h>
13
14#include "chip.h"
15#include "global1.h"
16
17/* Offset 0x02: VTU FID Register */
18
19static int mv88e6xxx_g1_vtu_fid_read(struct mv88e6xxx_chip *chip,
20 struct mv88e6xxx_vtu_entry *entry)
21{
22 u16 val;
23 int err;
24
25 err = mv88e6xxx_g1_read(chip, MV88E6352_G1_VTU_FID, &val);
26 if (err)
27 return err;
28
29 entry->fid = val & MV88E6352_G1_VTU_FID_MASK;
30
31 return 0;
32}
33
34static int mv88e6xxx_g1_vtu_fid_write(struct mv88e6xxx_chip *chip,
35 struct mv88e6xxx_vtu_entry *entry)
36{
37 u16 val = entry->fid & MV88E6352_G1_VTU_FID_MASK;
38
39 return mv88e6xxx_g1_write(chip, MV88E6352_G1_VTU_FID, val);
40}
41
42/* Offset 0x03: VTU SID Register */
43
44static int mv88e6xxx_g1_vtu_sid_read(struct mv88e6xxx_chip *chip,
45 struct mv88e6xxx_vtu_entry *entry)
46{
47 u16 val;
48 int err;
49
50 err = mv88e6xxx_g1_read(chip, MV88E6352_G1_VTU_SID, &val);
51 if (err)
52 return err;
53
54 entry->sid = val & MV88E6352_G1_VTU_SID_MASK;
55
56 return 0;
57}
58
59static int mv88e6xxx_g1_vtu_sid_write(struct mv88e6xxx_chip *chip,
60 struct mv88e6xxx_vtu_entry *entry)
61{
62 u16 val = entry->sid & MV88E6352_G1_VTU_SID_MASK;
63
64 return mv88e6xxx_g1_write(chip, MV88E6352_G1_VTU_SID, val);
65}
66
67/* Offset 0x05: VTU Operation Register */
68
69static int mv88e6xxx_g1_vtu_op_wait(struct mv88e6xxx_chip *chip)
70{
71 int bit = __bf_shf(MV88E6XXX_G1_VTU_OP_BUSY);
72
73 return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_VTU_OP, bit, 0);
74}
75
76static int mv88e6xxx_g1_vtu_op(struct mv88e6xxx_chip *chip, u16 op)
77{
78 int err;
79
80 err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_VTU_OP,
81 MV88E6XXX_G1_VTU_OP_BUSY | op);
82 if (err)
83 return err;
84
85 return mv88e6xxx_g1_vtu_op_wait(chip);
86}
87
88/* Offset 0x06: VTU VID Register */
89
90static int mv88e6xxx_g1_vtu_vid_read(struct mv88e6xxx_chip *chip,
91 struct mv88e6xxx_vtu_entry *entry)
92{
93 u16 val;
94 int err;
95
96 err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_VTU_VID, &val);
97 if (err)
98 return err;
99
100 entry->vid = val & 0xfff;
101
102 if (val & MV88E6390_G1_VTU_VID_PAGE)
103 entry->vid |= 0x1000;
104
105 entry->valid = !!(val & MV88E6XXX_G1_VTU_VID_VALID);
106
107 return 0;
108}
109
110static int mv88e6xxx_g1_vtu_vid_write(struct mv88e6xxx_chip *chip,
111 struct mv88e6xxx_vtu_entry *entry)
112{
113 u16 val = entry->vid & 0xfff;
114
115 if (entry->vid & 0x1000)
116 val |= MV88E6390_G1_VTU_VID_PAGE;
117
118 if (entry->valid)
119 val |= MV88E6XXX_G1_VTU_VID_VALID;
120
121 return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_VTU_VID, val);
122}
123
124/* Offset 0x07: VTU/STU Data Register 1
125 * Offset 0x08: VTU/STU Data Register 2
126 * Offset 0x09: VTU/STU Data Register 3
127 */
128static int mv88e6185_g1_vtu_stu_data_read(struct mv88e6xxx_chip *chip,
129 u16 *regs)
130{
131 int i;
132
133 /* Read all 3 VTU/STU Data registers */
134 for (i = 0; i < 3; ++i) {
135 u16 *reg = ®s[i];
136 int err;
137
138 err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_VTU_DATA1 + i, reg);
139 if (err)
140 return err;
141 }
142
143 return 0;
144}
145
146static int mv88e6185_g1_vtu_data_read(struct mv88e6xxx_chip *chip,
147 struct mv88e6xxx_vtu_entry *entry)
148{
149 u16 regs[3];
150 int err;
151 int i;
152
153 err = mv88e6185_g1_vtu_stu_data_read(chip, regs);
154 if (err)
155 return err;
156
157 /* Extract MemberTag data */
158 for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
159 unsigned int member_offset = (i % 4) * 4;
160
161 entry->member[i] = (regs[i / 4] >> member_offset) & 0x3;
162 }
163
164 return 0;
165}
166
167static int mv88e6185_g1_stu_data_read(struct mv88e6xxx_chip *chip,
168 struct mv88e6xxx_vtu_entry *entry)
169{
170 u16 regs[3];
171 int err;
172 int i;
173
174 err = mv88e6185_g1_vtu_stu_data_read(chip, regs);
175 if (err)
176 return err;
177
178 /* Extract PortState data */
179 for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
180 unsigned int state_offset = (i % 4) * 4 + 2;
181
182 entry->state[i] = (regs[i / 4] >> state_offset) & 0x3;
183 }
184
185 return 0;
186}
187
188static int mv88e6185_g1_vtu_data_write(struct mv88e6xxx_chip *chip,
189 struct mv88e6xxx_vtu_entry *entry)
190{
191 u16 regs[3] = { 0 };
192 int i;
193
194 /* Insert MemberTag and PortState data */
195 for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
196 unsigned int member_offset = (i % 4) * 4;
197 unsigned int state_offset = member_offset + 2;
198
199 regs[i / 4] |= (entry->member[i] & 0x3) << member_offset;
200 regs[i / 4] |= (entry->state[i] & 0x3) << state_offset;
201 }
202
203 /* Write all 3 VTU/STU Data registers */
204 for (i = 0; i < 3; ++i) {
205 u16 reg = regs[i];
206 int err;
207
208 err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_VTU_DATA1 + i, reg);
209 if (err)
210 return err;
211 }
212
213 return 0;
214}
215
216static int mv88e6390_g1_vtu_data_read(struct mv88e6xxx_chip *chip, u8 *data)
217{
218 u16 regs[2];
219 int i;
220
221 /* Read the 2 VTU/STU Data registers */
222 for (i = 0; i < 2; ++i) {
223 u16 *reg = ®s[i];
224 int err;
225
226 err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_VTU_DATA1 + i, reg);
227 if (err)
228 return err;
229 }
230
231 /* Extract data */
232 for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
233 unsigned int offset = (i % 8) * 2;
234
235 data[i] = (regs[i / 8] >> offset) & 0x3;
236 }
237
238 return 0;
239}
240
241static int mv88e6390_g1_vtu_data_write(struct mv88e6xxx_chip *chip, u8 *data)
242{
243 u16 regs[2] = { 0 };
244 int i;
245
246 /* Insert data */
247 for (i = 0; i < mv88e6xxx_num_ports(chip); ++i) {
248 unsigned int offset = (i % 8) * 2;
249
250 regs[i / 8] |= (data[i] & 0x3) << offset;
251 }
252
253 /* Write the 2 VTU/STU Data registers */
254 for (i = 0; i < 2; ++i) {
255 u16 reg = regs[i];
256 int err;
257
258 err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_VTU_DATA1 + i, reg);
259 if (err)
260 return err;
261 }
262
263 return 0;
264}
265
266/* VLAN Translation Unit Operations */
267
268static int mv88e6xxx_g1_vtu_stu_getnext(struct mv88e6xxx_chip *chip,
269 struct mv88e6xxx_vtu_entry *entry)
270{
271 int err;
272
273 err = mv88e6xxx_g1_vtu_sid_write(chip, entry);
274 if (err)
275 return err;
276
277 err = mv88e6xxx_g1_vtu_op(chip, MV88E6XXX_G1_VTU_OP_STU_GET_NEXT);
278 if (err)
279 return err;
280
281 err = mv88e6xxx_g1_vtu_sid_read(chip, entry);
282 if (err)
283 return err;
284
285 return mv88e6xxx_g1_vtu_vid_read(chip, entry);
286}
287
288static int mv88e6xxx_g1_vtu_stu_get(struct mv88e6xxx_chip *chip,
289 struct mv88e6xxx_vtu_entry *vtu)
290{
291 struct mv88e6xxx_vtu_entry stu;
292 int err;
293
294 err = mv88e6xxx_g1_vtu_sid_read(chip, vtu);
295 if (err)
296 return err;
297
298 stu.sid = vtu->sid - 1;
299
300 err = mv88e6xxx_g1_vtu_stu_getnext(chip, &stu);
301 if (err)
302 return err;
303
304 if (stu.sid != vtu->sid || !stu.valid)
305 return -EINVAL;
306
307 return 0;
308}
309
310int mv88e6xxx_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
311 struct mv88e6xxx_vtu_entry *entry)
312{
313 int err;
314
315 err = mv88e6xxx_g1_vtu_op_wait(chip);
316 if (err)
317 return err;
318
319 /* To get the next higher active VID, the VTU GetNext operation can be
320 * started again without setting the VID registers since it already
321 * contains the last VID.
322 *
323 * To save a few hardware accesses and abstract this to the caller,
324 * write the VID only once, when the entry is given as invalid.
325 */
326 if (!entry->valid) {
327 err = mv88e6xxx_g1_vtu_vid_write(chip, entry);
328 if (err)
329 return err;
330 }
331
332 err = mv88e6xxx_g1_vtu_op(chip, MV88E6XXX_G1_VTU_OP_VTU_GET_NEXT);
333 if (err)
334 return err;
335
336 return mv88e6xxx_g1_vtu_vid_read(chip, entry);
337}
338
339int mv88e6185_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
340 struct mv88e6xxx_vtu_entry *entry)
341{
342 u16 val;
343 int err;
344
345 err = mv88e6xxx_g1_vtu_getnext(chip, entry);
346 if (err)
347 return err;
348
349 if (entry->valid) {
350 err = mv88e6185_g1_vtu_data_read(chip, entry);
351 if (err)
352 return err;
353
354 err = mv88e6185_g1_stu_data_read(chip, entry);
355 if (err)
356 return err;
357
358 /* VTU DBNum[3:0] are located in VTU Operation 3:0
359 * VTU DBNum[7:4] ([5:4] for 6250) are located in VTU Operation 11:8 (9:8)
360 */
361 err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_VTU_OP, &val);
362 if (err)
363 return err;
364
365 entry->fid = val & 0x000f;
366 entry->fid |= (val & 0x0f00) >> 4;
367 entry->fid &= mv88e6xxx_num_databases(chip) - 1;
368 }
369
370 return 0;
371}
372
373int mv88e6352_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
374 struct mv88e6xxx_vtu_entry *entry)
375{
376 int err;
377
378 /* Fetch VLAN MemberTag data from the VTU */
379 err = mv88e6xxx_g1_vtu_getnext(chip, entry);
380 if (err)
381 return err;
382
383 if (entry->valid) {
384 err = mv88e6185_g1_vtu_data_read(chip, entry);
385 if (err)
386 return err;
387
388 err = mv88e6xxx_g1_vtu_fid_read(chip, entry);
389 if (err)
390 return err;
391
392 /* Fetch VLAN PortState data from the STU */
393 err = mv88e6xxx_g1_vtu_stu_get(chip, entry);
394 if (err)
395 return err;
396
397 err = mv88e6185_g1_stu_data_read(chip, entry);
398 if (err)
399 return err;
400 }
401
402 return 0;
403}
404
405int mv88e6390_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
406 struct mv88e6xxx_vtu_entry *entry)
407{
408 int err;
409
410 /* Fetch VLAN MemberTag data from the VTU */
411 err = mv88e6xxx_g1_vtu_getnext(chip, entry);
412 if (err)
413 return err;
414
415 if (entry->valid) {
416 err = mv88e6390_g1_vtu_data_read(chip, entry->member);
417 if (err)
418 return err;
419
420 /* Fetch VLAN PortState data from the STU */
421 err = mv88e6xxx_g1_vtu_stu_get(chip, entry);
422 if (err)
423 return err;
424
425 err = mv88e6390_g1_vtu_data_read(chip, entry->state);
426 if (err)
427 return err;
428
429 err = mv88e6xxx_g1_vtu_fid_read(chip, entry);
430 if (err)
431 return err;
432 }
433
434 return 0;
435}
436
437int mv88e6185_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
438 struct mv88e6xxx_vtu_entry *entry)
439{
440 u16 op = MV88E6XXX_G1_VTU_OP_VTU_LOAD_PURGE;
441 int err;
442
443 err = mv88e6xxx_g1_vtu_op_wait(chip);
444 if (err)
445 return err;
446
447 err = mv88e6xxx_g1_vtu_vid_write(chip, entry);
448 if (err)
449 return err;
450
451 if (entry->valid) {
452 err = mv88e6185_g1_vtu_data_write(chip, entry);
453 if (err)
454 return err;
455
456 /* VTU DBNum[3:0] are located in VTU Operation 3:0
457 * VTU DBNum[7:4] are located in VTU Operation 11:8
458 *
459 * For the 6250/6220, the latter are really [5:4] and
460 * 9:8, but in those cases bits 7:6 of entry->fid are
461 * 0 since they have num_databases = 64.
462 */
463 op |= entry->fid & 0x000f;
464 op |= (entry->fid & 0x00f0) << 4;
465 }
466
467 return mv88e6xxx_g1_vtu_op(chip, op);
468}
469
470int mv88e6352_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
471 struct mv88e6xxx_vtu_entry *entry)
472{
473 int err;
474
475 err = mv88e6xxx_g1_vtu_op_wait(chip);
476 if (err)
477 return err;
478
479 err = mv88e6xxx_g1_vtu_vid_write(chip, entry);
480 if (err)
481 return err;
482
483 if (entry->valid) {
484 /* Write MemberTag and PortState data */
485 err = mv88e6185_g1_vtu_data_write(chip, entry);
486 if (err)
487 return err;
488
489 err = mv88e6xxx_g1_vtu_sid_write(chip, entry);
490 if (err)
491 return err;
492
493 /* Load STU entry */
494 err = mv88e6xxx_g1_vtu_op(chip,
495 MV88E6XXX_G1_VTU_OP_STU_LOAD_PURGE);
496 if (err)
497 return err;
498
499 err = mv88e6xxx_g1_vtu_fid_write(chip, entry);
500 if (err)
501 return err;
502 }
503
504 /* Load/Purge VTU entry */
505 return mv88e6xxx_g1_vtu_op(chip, MV88E6XXX_G1_VTU_OP_VTU_LOAD_PURGE);
506}
507
508int mv88e6390_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
509 struct mv88e6xxx_vtu_entry *entry)
510{
511 int err;
512
513 err = mv88e6xxx_g1_vtu_op_wait(chip);
514 if (err)
515 return err;
516
517 err = mv88e6xxx_g1_vtu_vid_write(chip, entry);
518 if (err)
519 return err;
520
521 if (entry->valid) {
522 /* Write PortState data */
523 err = mv88e6390_g1_vtu_data_write(chip, entry->state);
524 if (err)
525 return err;
526
527 err = mv88e6xxx_g1_vtu_sid_write(chip, entry);
528 if (err)
529 return err;
530
531 /* Load STU entry */
532 err = mv88e6xxx_g1_vtu_op(chip,
533 MV88E6XXX_G1_VTU_OP_STU_LOAD_PURGE);
534 if (err)
535 return err;
536
537 /* Write MemberTag data */
538 err = mv88e6390_g1_vtu_data_write(chip, entry->member);
539 if (err)
540 return err;
541
542 err = mv88e6xxx_g1_vtu_fid_write(chip, entry);
543 if (err)
544 return err;
545 }
546
547 /* Load/Purge VTU entry */
548 return mv88e6xxx_g1_vtu_op(chip, MV88E6XXX_G1_VTU_OP_VTU_LOAD_PURGE);
549}
550
551int mv88e6xxx_g1_vtu_flush(struct mv88e6xxx_chip *chip)
552{
553 int err;
554
555 err = mv88e6xxx_g1_vtu_op_wait(chip);
556 if (err)
557 return err;
558
559 return mv88e6xxx_g1_vtu_op(chip, MV88E6XXX_G1_VTU_OP_FLUSH_ALL);
560}
561
562static irqreturn_t mv88e6xxx_g1_vtu_prob_irq_thread_fn(int irq, void *dev_id)
563{
564 struct mv88e6xxx_chip *chip = dev_id;
565 struct mv88e6xxx_vtu_entry entry;
566 int spid;
567 int err;
568 u16 val;
569
570 mv88e6xxx_reg_lock(chip);
571
572 err = mv88e6xxx_g1_vtu_op(chip, MV88E6XXX_G1_VTU_OP_GET_CLR_VIOLATION);
573 if (err)
574 goto out;
575
576 err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_VTU_OP, &val);
577 if (err)
578 goto out;
579
580 err = mv88e6xxx_g1_vtu_vid_read(chip, &entry);
581 if (err)
582 goto out;
583
584 spid = val & MV88E6XXX_G1_VTU_OP_SPID_MASK;
585
586 if (val & MV88E6XXX_G1_VTU_OP_MEMBER_VIOLATION) {
587 dev_err_ratelimited(chip->dev, "VTU member violation for vid %d, source port %d\n",
588 entry.vid, spid);
589 chip->ports[spid].vtu_member_violation++;
590 }
591
592 if (val & MV88E6XXX_G1_VTU_OP_MISS_VIOLATION) {
593 dev_dbg_ratelimited(chip->dev, "VTU miss violation for vid %d, source port %d\n",
594 entry.vid, spid);
595 chip->ports[spid].vtu_miss_violation++;
596 }
597
598 mv88e6xxx_reg_unlock(chip);
599
600 return IRQ_HANDLED;
601
602out:
603 mv88e6xxx_reg_unlock(chip);
604
605 dev_err(chip->dev, "VTU problem: error %d while handling interrupt\n",
606 err);
607
608 return IRQ_HANDLED;
609}
610
611int mv88e6xxx_g1_vtu_prob_irq_setup(struct mv88e6xxx_chip *chip)
612{
613 int err;
614
615 chip->vtu_prob_irq = irq_find_mapping(chip->g1_irq.domain,
616 MV88E6XXX_G1_STS_IRQ_VTU_PROB);
617 if (chip->vtu_prob_irq < 0)
618 return chip->vtu_prob_irq;
619
620 snprintf(chip->vtu_prob_irq_name, sizeof(chip->vtu_prob_irq_name),
621 "mv88e6xxx-%s-g1-vtu-prob", dev_name(chip->dev));
622
623 err = request_threaded_irq(chip->vtu_prob_irq, NULL,
624 mv88e6xxx_g1_vtu_prob_irq_thread_fn,
625 IRQF_ONESHOT, chip->vtu_prob_irq_name,
626 chip);
627 if (err)
628 irq_dispose_mapping(chip->vtu_prob_irq);
629
630 return err;
631}
632
633void mv88e6xxx_g1_vtu_prob_irq_free(struct mv88e6xxx_chip *chip)
634{
635 free_irq(chip->vtu_prob_irq, chip);
636 irq_dispose_mapping(chip->vtu_prob_irq);
637}