1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Renesas RZ/G2L MTU3a Counter driver
4 *
5 * Copyright (C) 2022 Renesas Electronics Corporation
6 */
7
8 #include <linux/clk.h>
9 #include <linux/counter.h>
10 #include <linux/mfd/rz-mtu3.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/types.h>
15
16 /*
17 * Register descriptions
18 * TSR: Timer Status Register
19 * TMDR1: Timer Mode Register 1
20 * TMDR3: Timer Mode Register 3
21 * TIOR: Timer I/O Control Register
22 * TCR: Timer Control Register
23 * TCNT: Timer Counter
24 * TGRA: Timer general register A
25 * TCNTLW: Timer Longword Counter
26 * TGRALW: Timer longword general register A
27 */
28
29 #define RZ_MTU3_TSR_TCFD BIT(7) /* Count Direction Flag */
30
31 #define RZ_MTU3_TMDR1_PH_CNT_MODE_1 (4) /* Phase counting mode 1 */
32 #define RZ_MTU3_TMDR1_PH_CNT_MODE_2 (5) /* Phase counting mode 2 */
33 #define RZ_MTU3_TMDR1_PH_CNT_MODE_3 (6) /* Phase counting mode 3 */
34 #define RZ_MTU3_TMDR1_PH_CNT_MODE_4 (7) /* Phase counting mode 4 */
35 #define RZ_MTU3_TMDR1_PH_CNT_MODE_5 (9) /* Phase counting mode 5 */
36 #define RZ_MTU3_TMDR1_PH_CNT_MODE_MASK (0xf)
37
38 /*
39 * LWA: MTU1/MTU2 Combination Longword Access Control
40 * 0: 16-bit, 1: 32-bit
41 */
42 #define RZ_MTU3_TMDR3_LWA (0)
43
44 /*
45 * PHCKSEL: External Input Phase Clock Select
46 * 0: MTCLKA and MTCLKB, 1: MTCLKC and MTCLKD
47 */
48 #define RZ_MTU3_TMDR3_PHCKSEL (1)
49
50 #define RZ_MTU3_16_BIT_MTU1_CH (0)
51 #define RZ_MTU3_16_BIT_MTU2_CH (1)
52 #define RZ_MTU3_32_BIT_CH (2)
53
54 #define RZ_MTU3_TIOR_NO_OUTPUT (0) /* Output prohibited */
55 #define RZ_MTU3_TIOR_IC_BOTH (10) /* Input capture at both edges */
56
57 #define SIGNAL_A_ID (0)
58 #define SIGNAL_B_ID (1)
59 #define SIGNAL_C_ID (2)
60 #define SIGNAL_D_ID (3)
61
62 #define RZ_MTU3_MAX_HW_CNTR_CHANNELS (2)
63 #define RZ_MTU3_MAX_LOGICAL_CNTR_CHANNELS (3)
64
65 /**
66 * struct rz_mtu3_cnt - MTU3 counter private data
67 *
68 * @clk: MTU3 module clock
69 * @lock: Lock to prevent concurrent access for ceiling and count
70 * @ch: HW channels for the counters
71 * @count_is_enabled: Enabled state of Counter value channel
72 * @mtu_16bit_max: Cache for 16-bit counters
73 * @mtu_32bit_max: Cache for 32-bit counters
74 */
75 struct rz_mtu3_cnt {
76 struct clk *clk;
77 struct mutex lock;
78 struct rz_mtu3_channel *ch;
79 bool count_is_enabled[RZ_MTU3_MAX_LOGICAL_CNTR_CHANNELS];
80 union {
81 u16 mtu_16bit_max[RZ_MTU3_MAX_HW_CNTR_CHANNELS];
82 u32 mtu_32bit_max;
83 };
84 };
85
86 static const enum counter_function rz_mtu3_count_functions[] = {
87 COUNTER_FUNCTION_QUADRATURE_X4,
88 COUNTER_FUNCTION_PULSE_DIRECTION,
89 COUNTER_FUNCTION_QUADRATURE_X2_B,
90 };
91
rz_mtu3_get_hw_ch(const size_t id)92 static inline size_t rz_mtu3_get_hw_ch(const size_t id)
93 {
94 return (id == RZ_MTU3_32_BIT_CH) ? 0 : id;
95 }
96
rz_mtu3_get_ch(struct counter_device * counter,int id)97 static inline struct rz_mtu3_channel *rz_mtu3_get_ch(struct counter_device *counter, int id)
98 {
99 struct rz_mtu3_cnt *const priv = counter_priv(counter);
100 const size_t ch_id = rz_mtu3_get_hw_ch(id);
101
102 return &priv->ch[ch_id];
103 }
104
rz_mtu3_is_counter_invalid(struct counter_device * counter,int id)105 static bool rz_mtu3_is_counter_invalid(struct counter_device *counter, int id)
106 {
107 struct rz_mtu3_cnt *const priv = counter_priv(counter);
108 unsigned long tmdr;
109
110 pm_runtime_get_sync(priv->ch->dev);
111 tmdr = rz_mtu3_shared_reg_read(priv->ch, RZ_MTU3_TMDR3);
112 pm_runtime_put(priv->ch->dev);
113
114 if (id == RZ_MTU3_32_BIT_CH && test_bit(RZ_MTU3_TMDR3_LWA, &tmdr))
115 return false;
116
117 if (id != RZ_MTU3_32_BIT_CH && !test_bit(RZ_MTU3_TMDR3_LWA, &tmdr))
118 return false;
119
120 return true;
121 }
122
rz_mtu3_lock_if_counter_is_valid(struct counter_device * counter,struct rz_mtu3_channel * const ch,struct rz_mtu3_cnt * const priv,int id)123 static int rz_mtu3_lock_if_counter_is_valid(struct counter_device *counter,
124 struct rz_mtu3_channel *const ch,
125 struct rz_mtu3_cnt *const priv,
126 int id)
127 {
128 mutex_lock(&priv->lock);
129
130 if (ch->is_busy && !priv->count_is_enabled[id]) {
131 mutex_unlock(&priv->lock);
132 return -EINVAL;
133 }
134
135 if (rz_mtu3_is_counter_invalid(counter, id)) {
136 mutex_unlock(&priv->lock);
137 return -EBUSY;
138 }
139
140 return 0;
141 }
142
rz_mtu3_lock_if_count_is_enabled(struct rz_mtu3_channel * const ch,struct rz_mtu3_cnt * const priv,int id)143 static int rz_mtu3_lock_if_count_is_enabled(struct rz_mtu3_channel *const ch,
144 struct rz_mtu3_cnt *const priv,
145 int id)
146 {
147 mutex_lock(&priv->lock);
148
149 if (ch->is_busy && !priv->count_is_enabled[id]) {
150 mutex_unlock(&priv->lock);
151 return -EINVAL;
152 }
153
154 return 0;
155 }
156
rz_mtu3_count_read(struct counter_device * counter,struct counter_count * count,u64 * val)157 static int rz_mtu3_count_read(struct counter_device *counter,
158 struct counter_count *count, u64 *val)
159 {
160 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
161 struct rz_mtu3_cnt *const priv = counter_priv(counter);
162 int ret;
163
164 ret = rz_mtu3_lock_if_counter_is_valid(counter, ch, priv, count->id);
165 if (ret)
166 return ret;
167
168 pm_runtime_get_sync(ch->dev);
169 if (count->id == RZ_MTU3_32_BIT_CH)
170 *val = rz_mtu3_32bit_ch_read(ch, RZ_MTU3_TCNTLW);
171 else
172 *val = rz_mtu3_16bit_ch_read(ch, RZ_MTU3_TCNT);
173 pm_runtime_put(ch->dev);
174 mutex_unlock(&priv->lock);
175
176 return 0;
177 }
178
rz_mtu3_count_write(struct counter_device * counter,struct counter_count * count,const u64 val)179 static int rz_mtu3_count_write(struct counter_device *counter,
180 struct counter_count *count, const u64 val)
181 {
182 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
183 struct rz_mtu3_cnt *const priv = counter_priv(counter);
184 int ret;
185
186 ret = rz_mtu3_lock_if_counter_is_valid(counter, ch, priv, count->id);
187 if (ret)
188 return ret;
189
190 pm_runtime_get_sync(ch->dev);
191 if (count->id == RZ_MTU3_32_BIT_CH)
192 rz_mtu3_32bit_ch_write(ch, RZ_MTU3_TCNTLW, val);
193 else
194 rz_mtu3_16bit_ch_write(ch, RZ_MTU3_TCNT, val);
195 pm_runtime_put(ch->dev);
196 mutex_unlock(&priv->lock);
197
198 return 0;
199 }
200
rz_mtu3_count_function_read_helper(struct rz_mtu3_channel * const ch,struct rz_mtu3_cnt * const priv,enum counter_function * function)201 static int rz_mtu3_count_function_read_helper(struct rz_mtu3_channel *const ch,
202 struct rz_mtu3_cnt *const priv,
203 enum counter_function *function)
204 {
205 u8 timer_mode;
206
207 pm_runtime_get_sync(ch->dev);
208 timer_mode = rz_mtu3_8bit_ch_read(ch, RZ_MTU3_TMDR1);
209 pm_runtime_put(ch->dev);
210
211 switch (timer_mode & RZ_MTU3_TMDR1_PH_CNT_MODE_MASK) {
212 case RZ_MTU3_TMDR1_PH_CNT_MODE_1:
213 *function = COUNTER_FUNCTION_QUADRATURE_X4;
214 return 0;
215 case RZ_MTU3_TMDR1_PH_CNT_MODE_2:
216 *function = COUNTER_FUNCTION_PULSE_DIRECTION;
217 return 0;
218 case RZ_MTU3_TMDR1_PH_CNT_MODE_4:
219 *function = COUNTER_FUNCTION_QUADRATURE_X2_B;
220 return 0;
221 default:
222 /*
223 * TODO:
224 * - need to add RZ_MTU3_TMDR1_PH_CNT_MODE_3
225 * - need to add RZ_MTU3_TMDR1_PH_CNT_MODE_5
226 */
227 return -EINVAL;
228 }
229 }
230
rz_mtu3_count_function_read(struct counter_device * counter,struct counter_count * count,enum counter_function * function)231 static int rz_mtu3_count_function_read(struct counter_device *counter,
232 struct counter_count *count,
233 enum counter_function *function)
234 {
235 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
236 struct rz_mtu3_cnt *const priv = counter_priv(counter);
237 int ret;
238
239 ret = rz_mtu3_lock_if_count_is_enabled(ch, priv, count->id);
240 if (ret)
241 return ret;
242
243 ret = rz_mtu3_count_function_read_helper(ch, priv, function);
244 mutex_unlock(&priv->lock);
245
246 return ret;
247 }
248
rz_mtu3_count_function_write(struct counter_device * counter,struct counter_count * count,enum counter_function function)249 static int rz_mtu3_count_function_write(struct counter_device *counter,
250 struct counter_count *count,
251 enum counter_function function)
252 {
253 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
254 struct rz_mtu3_cnt *const priv = counter_priv(counter);
255 u8 timer_mode;
256 int ret;
257
258 ret = rz_mtu3_lock_if_count_is_enabled(ch, priv, count->id);
259 if (ret)
260 return ret;
261
262 switch (function) {
263 case COUNTER_FUNCTION_QUADRATURE_X4:
264 timer_mode = RZ_MTU3_TMDR1_PH_CNT_MODE_1;
265 break;
266 case COUNTER_FUNCTION_PULSE_DIRECTION:
267 timer_mode = RZ_MTU3_TMDR1_PH_CNT_MODE_2;
268 break;
269 case COUNTER_FUNCTION_QUADRATURE_X2_B:
270 timer_mode = RZ_MTU3_TMDR1_PH_CNT_MODE_4;
271 break;
272 default:
273 /*
274 * TODO:
275 * - need to add RZ_MTU3_TMDR1_PH_CNT_MODE_3
276 * - need to add RZ_MTU3_TMDR1_PH_CNT_MODE_5
277 */
278 mutex_unlock(&priv->lock);
279 return -EINVAL;
280 }
281
282 pm_runtime_get_sync(ch->dev);
283 rz_mtu3_8bit_ch_write(ch, RZ_MTU3_TMDR1, timer_mode);
284 pm_runtime_put(ch->dev);
285 mutex_unlock(&priv->lock);
286
287 return 0;
288 }
289
rz_mtu3_count_direction_read(struct counter_device * counter,struct counter_count * count,enum counter_count_direction * direction)290 static int rz_mtu3_count_direction_read(struct counter_device *counter,
291 struct counter_count *count,
292 enum counter_count_direction *direction)
293 {
294 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
295 struct rz_mtu3_cnt *const priv = counter_priv(counter);
296 int ret;
297 u8 tsr;
298
299 ret = rz_mtu3_lock_if_count_is_enabled(ch, priv, count->id);
300 if (ret)
301 return ret;
302
303 pm_runtime_get_sync(ch->dev);
304 tsr = rz_mtu3_8bit_ch_read(ch, RZ_MTU3_TSR);
305 pm_runtime_put(ch->dev);
306
307 *direction = (tsr & RZ_MTU3_TSR_TCFD) ?
308 COUNTER_COUNT_DIRECTION_FORWARD : COUNTER_COUNT_DIRECTION_BACKWARD;
309 mutex_unlock(&priv->lock);
310
311 return 0;
312 }
313
rz_mtu3_count_ceiling_read(struct counter_device * counter,struct counter_count * count,u64 * ceiling)314 static int rz_mtu3_count_ceiling_read(struct counter_device *counter,
315 struct counter_count *count,
316 u64 *ceiling)
317 {
318 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
319 struct rz_mtu3_cnt *const priv = counter_priv(counter);
320 const size_t ch_id = rz_mtu3_get_hw_ch(count->id);
321 int ret;
322
323 ret = rz_mtu3_lock_if_counter_is_valid(counter, ch, priv, count->id);
324 if (ret)
325 return ret;
326
327 switch (count->id) {
328 case RZ_MTU3_16_BIT_MTU1_CH:
329 case RZ_MTU3_16_BIT_MTU2_CH:
330 *ceiling = priv->mtu_16bit_max[ch_id];
331 break;
332 case RZ_MTU3_32_BIT_CH:
333 *ceiling = priv->mtu_32bit_max;
334 break;
335 default:
336 /* should never reach this path */
337 mutex_unlock(&priv->lock);
338 return -EINVAL;
339 }
340
341 mutex_unlock(&priv->lock);
342 return 0;
343 }
344
rz_mtu3_count_ceiling_write(struct counter_device * counter,struct counter_count * count,u64 ceiling)345 static int rz_mtu3_count_ceiling_write(struct counter_device *counter,
346 struct counter_count *count,
347 u64 ceiling)
348 {
349 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
350 struct rz_mtu3_cnt *const priv = counter_priv(counter);
351 const size_t ch_id = rz_mtu3_get_hw_ch(count->id);
352 int ret;
353
354 ret = rz_mtu3_lock_if_counter_is_valid(counter, ch, priv, count->id);
355 if (ret)
356 return ret;
357
358 switch (count->id) {
359 case RZ_MTU3_16_BIT_MTU1_CH:
360 case RZ_MTU3_16_BIT_MTU2_CH:
361 if (ceiling > U16_MAX) {
362 mutex_unlock(&priv->lock);
363 return -ERANGE;
364 }
365 priv->mtu_16bit_max[ch_id] = ceiling;
366 break;
367 case RZ_MTU3_32_BIT_CH:
368 if (ceiling > U32_MAX) {
369 mutex_unlock(&priv->lock);
370 return -ERANGE;
371 }
372 priv->mtu_32bit_max = ceiling;
373 break;
374 default:
375 /* should never reach this path */
376 mutex_unlock(&priv->lock);
377 return -EINVAL;
378 }
379
380 pm_runtime_get_sync(ch->dev);
381 if (count->id == RZ_MTU3_32_BIT_CH)
382 rz_mtu3_32bit_ch_write(ch, RZ_MTU3_TGRALW, ceiling);
383 else
384 rz_mtu3_16bit_ch_write(ch, RZ_MTU3_TGRA, ceiling);
385
386 rz_mtu3_8bit_ch_write(ch, RZ_MTU3_TCR, RZ_MTU3_TCR_CCLR_TGRA);
387 pm_runtime_put(ch->dev);
388 mutex_unlock(&priv->lock);
389
390 return 0;
391 }
392
rz_mtu3_32bit_cnt_setting(struct counter_device * counter)393 static void rz_mtu3_32bit_cnt_setting(struct counter_device *counter)
394 {
395 struct rz_mtu3_channel *const ch1 = rz_mtu3_get_ch(counter, 0);
396 struct rz_mtu3_channel *const ch2 = rz_mtu3_get_ch(counter, 1);
397
398 /* Phase counting mode 1 is used as default in initialization. */
399 rz_mtu3_8bit_ch_write(ch1, RZ_MTU3_TMDR1, RZ_MTU3_TMDR1_PH_CNT_MODE_1);
400
401 rz_mtu3_8bit_ch_write(ch1, RZ_MTU3_TCR, RZ_MTU3_TCR_CCLR_TGRA);
402 rz_mtu3_8bit_ch_write(ch1, RZ_MTU3_TIOR, RZ_MTU3_TIOR_IC_BOTH);
403
404 rz_mtu3_enable(ch1);
405 rz_mtu3_enable(ch2);
406 }
407
rz_mtu3_16bit_cnt_setting(struct counter_device * counter,int id)408 static void rz_mtu3_16bit_cnt_setting(struct counter_device *counter, int id)
409 {
410 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, id);
411
412 /* Phase counting mode 1 is used as default in initialization. */
413 rz_mtu3_8bit_ch_write(ch, RZ_MTU3_TMDR1, RZ_MTU3_TMDR1_PH_CNT_MODE_1);
414
415 rz_mtu3_8bit_ch_write(ch, RZ_MTU3_TCR, RZ_MTU3_TCR_CCLR_TGRA);
416 rz_mtu3_8bit_ch_write(ch, RZ_MTU3_TIOR, RZ_MTU3_TIOR_NO_OUTPUT);
417 rz_mtu3_enable(ch);
418 }
419
rz_mtu3_initialize_counter(struct counter_device * counter,int id)420 static int rz_mtu3_initialize_counter(struct counter_device *counter, int id)
421 {
422 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, id);
423 struct rz_mtu3_channel *const ch1 = rz_mtu3_get_ch(counter, 0);
424 struct rz_mtu3_channel *const ch2 = rz_mtu3_get_ch(counter, 1);
425
426 switch (id) {
427 case RZ_MTU3_16_BIT_MTU1_CH:
428 case RZ_MTU3_16_BIT_MTU2_CH:
429 if (!rz_mtu3_request_channel(ch))
430 return -EBUSY;
431
432 rz_mtu3_16bit_cnt_setting(counter, id);
433 return 0;
434 case RZ_MTU3_32_BIT_CH:
435 /*
436 * 32-bit phase counting need MTU1 and MTU2 to create 32-bit
437 * cascade counter.
438 */
439 if (!rz_mtu3_request_channel(ch1))
440 return -EBUSY;
441
442 if (!rz_mtu3_request_channel(ch2)) {
443 rz_mtu3_release_channel(ch1);
444 return -EBUSY;
445 }
446
447 rz_mtu3_32bit_cnt_setting(counter);
448 return 0;
449 default:
450 /* should never reach this path */
451 return -EINVAL;
452 }
453 }
454
rz_mtu3_terminate_counter(struct counter_device * counter,int id)455 static void rz_mtu3_terminate_counter(struct counter_device *counter, int id)
456 {
457 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, id);
458 struct rz_mtu3_channel *const ch1 = rz_mtu3_get_ch(counter, 0);
459 struct rz_mtu3_channel *const ch2 = rz_mtu3_get_ch(counter, 1);
460
461 if (id == RZ_MTU3_32_BIT_CH) {
462 rz_mtu3_release_channel(ch2);
463 rz_mtu3_release_channel(ch1);
464 rz_mtu3_disable(ch2);
465 rz_mtu3_disable(ch1);
466 } else {
467 rz_mtu3_release_channel(ch);
468 rz_mtu3_disable(ch);
469 }
470 }
471
rz_mtu3_count_enable_read(struct counter_device * counter,struct counter_count * count,u8 * enable)472 static int rz_mtu3_count_enable_read(struct counter_device *counter,
473 struct counter_count *count, u8 *enable)
474 {
475 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
476 struct rz_mtu3_channel *const ch1 = rz_mtu3_get_ch(counter, 0);
477 struct rz_mtu3_channel *const ch2 = rz_mtu3_get_ch(counter, 1);
478 struct rz_mtu3_cnt *const priv = counter_priv(counter);
479 int ret;
480
481 ret = rz_mtu3_lock_if_count_is_enabled(ch, priv, count->id);
482 if (ret)
483 return ret;
484
485 if (count->id == RZ_MTU3_32_BIT_CH)
486 *enable = rz_mtu3_is_enabled(ch1) && rz_mtu3_is_enabled(ch2);
487 else
488 *enable = rz_mtu3_is_enabled(ch);
489
490 mutex_unlock(&priv->lock);
491
492 return 0;
493 }
494
rz_mtu3_count_enable_write(struct counter_device * counter,struct counter_count * count,u8 enable)495 static int rz_mtu3_count_enable_write(struct counter_device *counter,
496 struct counter_count *count, u8 enable)
497 {
498 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
499 struct rz_mtu3_cnt *const priv = counter_priv(counter);
500 int ret = 0;
501
502 if (enable) {
503 mutex_lock(&priv->lock);
504 pm_runtime_get_sync(ch->dev);
505 ret = rz_mtu3_initialize_counter(counter, count->id);
506 if (ret == 0)
507 priv->count_is_enabled[count->id] = true;
508 mutex_unlock(&priv->lock);
509 } else {
510 mutex_lock(&priv->lock);
511 rz_mtu3_terminate_counter(counter, count->id);
512 priv->count_is_enabled[count->id] = false;
513 pm_runtime_put(ch->dev);
514 mutex_unlock(&priv->lock);
515 }
516
517 return ret;
518 }
519
rz_mtu3_lock_if_ch0_is_enabled(struct rz_mtu3_cnt * const priv)520 static int rz_mtu3_lock_if_ch0_is_enabled(struct rz_mtu3_cnt *const priv)
521 {
522 mutex_lock(&priv->lock);
523 if (priv->ch->is_busy && !(priv->count_is_enabled[RZ_MTU3_16_BIT_MTU1_CH] ||
524 priv->count_is_enabled[RZ_MTU3_32_BIT_CH])) {
525 mutex_unlock(&priv->lock);
526 return -EINVAL;
527 }
528
529 return 0;
530 }
531
rz_mtu3_cascade_counts_enable_get(struct counter_device * counter,u8 * cascade_enable)532 static int rz_mtu3_cascade_counts_enable_get(struct counter_device *counter,
533 u8 *cascade_enable)
534 {
535 struct rz_mtu3_cnt *const priv = counter_priv(counter);
536 unsigned long tmdr;
537 int ret;
538
539 ret = rz_mtu3_lock_if_ch0_is_enabled(priv);
540 if (ret)
541 return ret;
542
543 pm_runtime_get_sync(priv->ch->dev);
544 tmdr = rz_mtu3_shared_reg_read(priv->ch, RZ_MTU3_TMDR3);
545 pm_runtime_put(priv->ch->dev);
546 *cascade_enable = test_bit(RZ_MTU3_TMDR3_LWA, &tmdr);
547 mutex_unlock(&priv->lock);
548
549 return 0;
550 }
551
rz_mtu3_cascade_counts_enable_set(struct counter_device * counter,u8 cascade_enable)552 static int rz_mtu3_cascade_counts_enable_set(struct counter_device *counter,
553 u8 cascade_enable)
554 {
555 struct rz_mtu3_cnt *const priv = counter_priv(counter);
556 int ret;
557
558 ret = rz_mtu3_lock_if_ch0_is_enabled(priv);
559 if (ret)
560 return ret;
561
562 pm_runtime_get_sync(priv->ch->dev);
563 rz_mtu3_shared_reg_update_bit(priv->ch, RZ_MTU3_TMDR3,
564 RZ_MTU3_TMDR3_LWA, cascade_enable);
565 pm_runtime_put(priv->ch->dev);
566 mutex_unlock(&priv->lock);
567
568 return 0;
569 }
570
rz_mtu3_ext_input_phase_clock_select_get(struct counter_device * counter,u32 * ext_input_phase_clock_select)571 static int rz_mtu3_ext_input_phase_clock_select_get(struct counter_device *counter,
572 u32 *ext_input_phase_clock_select)
573 {
574 struct rz_mtu3_cnt *const priv = counter_priv(counter);
575 unsigned long tmdr;
576 int ret;
577
578 ret = rz_mtu3_lock_if_ch0_is_enabled(priv);
579 if (ret)
580 return ret;
581
582 pm_runtime_get_sync(priv->ch->dev);
583 tmdr = rz_mtu3_shared_reg_read(priv->ch, RZ_MTU3_TMDR3);
584 pm_runtime_put(priv->ch->dev);
585 *ext_input_phase_clock_select = test_bit(RZ_MTU3_TMDR3_PHCKSEL, &tmdr);
586 mutex_unlock(&priv->lock);
587
588 return 0;
589 }
590
rz_mtu3_ext_input_phase_clock_select_set(struct counter_device * counter,u32 ext_input_phase_clock_select)591 static int rz_mtu3_ext_input_phase_clock_select_set(struct counter_device *counter,
592 u32 ext_input_phase_clock_select)
593 {
594 struct rz_mtu3_cnt *const priv = counter_priv(counter);
595 int ret;
596
597 ret = rz_mtu3_lock_if_ch0_is_enabled(priv);
598 if (ret)
599 return ret;
600
601 pm_runtime_get_sync(priv->ch->dev);
602 rz_mtu3_shared_reg_update_bit(priv->ch, RZ_MTU3_TMDR3,
603 RZ_MTU3_TMDR3_PHCKSEL,
604 ext_input_phase_clock_select);
605 pm_runtime_put(priv->ch->dev);
606 mutex_unlock(&priv->lock);
607
608 return 0;
609 }
610
611 static struct counter_comp rz_mtu3_count_ext[] = {
612 COUNTER_COMP_DIRECTION(rz_mtu3_count_direction_read),
613 COUNTER_COMP_ENABLE(rz_mtu3_count_enable_read,
614 rz_mtu3_count_enable_write),
615 COUNTER_COMP_CEILING(rz_mtu3_count_ceiling_read,
616 rz_mtu3_count_ceiling_write),
617 };
618
619 static const enum counter_synapse_action rz_mtu3_synapse_actions[] = {
620 COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
621 COUNTER_SYNAPSE_ACTION_RISING_EDGE,
622 COUNTER_SYNAPSE_ACTION_NONE,
623 };
624
rz_mtu3_action_read(struct counter_device * counter,struct counter_count * count,struct counter_synapse * synapse,enum counter_synapse_action * action)625 static int rz_mtu3_action_read(struct counter_device *counter,
626 struct counter_count *count,
627 struct counter_synapse *synapse,
628 enum counter_synapse_action *action)
629 {
630 const bool is_signal_ab = (synapse->signal->id == SIGNAL_A_ID) ||
631 (synapse->signal->id == SIGNAL_B_ID);
632 struct rz_mtu3_channel *const ch = rz_mtu3_get_ch(counter, count->id);
633 struct rz_mtu3_cnt *const priv = counter_priv(counter);
634 enum counter_function function;
635 bool mtclkc_mtclkd;
636 unsigned long tmdr;
637 int ret;
638
639 ret = rz_mtu3_lock_if_count_is_enabled(ch, priv, count->id);
640 if (ret)
641 return ret;
642
643 ret = rz_mtu3_count_function_read_helper(ch, priv, &function);
644 if (ret) {
645 mutex_unlock(&priv->lock);
646 return ret;
647 }
648
649 /* Default action mode */
650 *action = COUNTER_SYNAPSE_ACTION_NONE;
651
652 if (count->id != RZ_MTU3_16_BIT_MTU1_CH) {
653 tmdr = rz_mtu3_shared_reg_read(priv->ch, RZ_MTU3_TMDR3);
654 mtclkc_mtclkd = test_bit(RZ_MTU3_TMDR3_PHCKSEL, &tmdr);
655 if ((mtclkc_mtclkd && is_signal_ab) ||
656 (!mtclkc_mtclkd && !is_signal_ab)) {
657 mutex_unlock(&priv->lock);
658 return 0;
659 }
660 }
661
662 switch (function) {
663 case COUNTER_FUNCTION_PULSE_DIRECTION:
664 /*
665 * Rising edges on signal A (signal C) updates the respective
666 * count. The input level of signal B (signal D) determines
667 * direction.
668 */
669 if (synapse->signal->id == SIGNAL_A_ID ||
670 synapse->signal->id == SIGNAL_C_ID)
671 *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
672 break;
673 case COUNTER_FUNCTION_QUADRATURE_X2_B:
674 /*
675 * Any state transition on quadrature pair signal B (signal D)
676 * updates the respective count.
677 */
678 if (synapse->signal->id == SIGNAL_B_ID ||
679 synapse->signal->id == SIGNAL_D_ID)
680 *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
681 break;
682 case COUNTER_FUNCTION_QUADRATURE_X4:
683 /* counts up/down on both edges of A (C) and B (D) signal */
684 *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
685 break;
686 default:
687 /* should never reach this path */
688 mutex_unlock(&priv->lock);
689 return -EINVAL;
690 }
691
692 mutex_unlock(&priv->lock);
693
694 return 0;
695 }
696
697 static const struct counter_ops rz_mtu3_cnt_ops = {
698 .count_read = rz_mtu3_count_read,
699 .count_write = rz_mtu3_count_write,
700 .function_read = rz_mtu3_count_function_read,
701 .function_write = rz_mtu3_count_function_write,
702 .action_read = rz_mtu3_action_read,
703 };
704
705 #define RZ_MTU3_PHASE_SIGNAL(_id, _name) { \
706 .id = (_id), \
707 .name = (_name), \
708 }
709
710 static struct counter_signal rz_mtu3_signals[] = {
711 RZ_MTU3_PHASE_SIGNAL(SIGNAL_A_ID, "MTU1 MTCLKA"),
712 RZ_MTU3_PHASE_SIGNAL(SIGNAL_B_ID, "MTU1 MTCLKB"),
713 RZ_MTU3_PHASE_SIGNAL(SIGNAL_C_ID, "MTU2 MTCLKC"),
714 RZ_MTU3_PHASE_SIGNAL(SIGNAL_D_ID, "MTU2 MTCLKD"),
715 };
716
717 static struct counter_synapse rz_mtu3_mtu1_count_synapses[] = {
718 {
719 .actions_list = rz_mtu3_synapse_actions,
720 .num_actions = ARRAY_SIZE(rz_mtu3_synapse_actions),
721 .signal = rz_mtu3_signals,
722 },
723 {
724 .actions_list = rz_mtu3_synapse_actions,
725 .num_actions = ARRAY_SIZE(rz_mtu3_synapse_actions),
726 .signal = rz_mtu3_signals + 1,
727 }
728 };
729
730 static struct counter_synapse rz_mtu3_mtu2_count_synapses[] = {
731 {
732 .actions_list = rz_mtu3_synapse_actions,
733 .num_actions = ARRAY_SIZE(rz_mtu3_synapse_actions),
734 .signal = rz_mtu3_signals,
735 },
736 {
737 .actions_list = rz_mtu3_synapse_actions,
738 .num_actions = ARRAY_SIZE(rz_mtu3_synapse_actions),
739 .signal = rz_mtu3_signals + 1,
740 },
741 {
742 .actions_list = rz_mtu3_synapse_actions,
743 .num_actions = ARRAY_SIZE(rz_mtu3_synapse_actions),
744 .signal = rz_mtu3_signals + 2,
745 },
746 {
747 .actions_list = rz_mtu3_synapse_actions,
748 .num_actions = ARRAY_SIZE(rz_mtu3_synapse_actions),
749 .signal = rz_mtu3_signals + 3,
750 }
751 };
752
753 static struct counter_count rz_mtu3_counts[] = {
754 {
755 .id = RZ_MTU3_16_BIT_MTU1_CH,
756 .name = "Channel 1 Count",
757 .functions_list = rz_mtu3_count_functions,
758 .num_functions = ARRAY_SIZE(rz_mtu3_count_functions),
759 .synapses = rz_mtu3_mtu1_count_synapses,
760 .num_synapses = ARRAY_SIZE(rz_mtu3_mtu1_count_synapses),
761 .ext = rz_mtu3_count_ext,
762 .num_ext = ARRAY_SIZE(rz_mtu3_count_ext),
763 },
764 {
765 .id = RZ_MTU3_16_BIT_MTU2_CH,
766 .name = "Channel 2 Count",
767 .functions_list = rz_mtu3_count_functions,
768 .num_functions = ARRAY_SIZE(rz_mtu3_count_functions),
769 .synapses = rz_mtu3_mtu2_count_synapses,
770 .num_synapses = ARRAY_SIZE(rz_mtu3_mtu2_count_synapses),
771 .ext = rz_mtu3_count_ext,
772 .num_ext = ARRAY_SIZE(rz_mtu3_count_ext),
773 },
774 {
775 .id = RZ_MTU3_32_BIT_CH,
776 .name = "Channel 1 and 2 (cascaded) Count",
777 .functions_list = rz_mtu3_count_functions,
778 .num_functions = ARRAY_SIZE(rz_mtu3_count_functions),
779 .synapses = rz_mtu3_mtu2_count_synapses,
780 .num_synapses = ARRAY_SIZE(rz_mtu3_mtu2_count_synapses),
781 .ext = rz_mtu3_count_ext,
782 .num_ext = ARRAY_SIZE(rz_mtu3_count_ext),
783 }
784 };
785
786 static const char *const rz_mtu3_ext_input_phase_clock_select[] = {
787 "MTCLKA-MTCLKB",
788 "MTCLKC-MTCLKD",
789 };
790
791 static DEFINE_COUNTER_ENUM(rz_mtu3_ext_input_phase_clock_select_enum,
792 rz_mtu3_ext_input_phase_clock_select);
793
794 static struct counter_comp rz_mtu3_device_ext[] = {
795 COUNTER_COMP_DEVICE_BOOL("cascade_counts_enable",
796 rz_mtu3_cascade_counts_enable_get,
797 rz_mtu3_cascade_counts_enable_set),
798 COUNTER_COMP_DEVICE_ENUM("external_input_phase_clock_select",
799 rz_mtu3_ext_input_phase_clock_select_get,
800 rz_mtu3_ext_input_phase_clock_select_set,
801 rz_mtu3_ext_input_phase_clock_select_enum),
802 };
803
rz_mtu3_cnt_pm_runtime_suspend(struct device * dev)804 static int rz_mtu3_cnt_pm_runtime_suspend(struct device *dev)
805 {
806 struct clk *const clk = dev_get_drvdata(dev);
807
808 clk_disable_unprepare(clk);
809
810 return 0;
811 }
812
rz_mtu3_cnt_pm_runtime_resume(struct device * dev)813 static int rz_mtu3_cnt_pm_runtime_resume(struct device *dev)
814 {
815 struct clk *const clk = dev_get_drvdata(dev);
816
817 clk_prepare_enable(clk);
818
819 return 0;
820 }
821
822 static DEFINE_RUNTIME_DEV_PM_OPS(rz_mtu3_cnt_pm_ops,
823 rz_mtu3_cnt_pm_runtime_suspend,
824 rz_mtu3_cnt_pm_runtime_resume, NULL);
825
rz_mtu3_cnt_pm_disable(void * data)826 static void rz_mtu3_cnt_pm_disable(void *data)
827 {
828 struct device *dev = data;
829
830 pm_runtime_disable(dev);
831 pm_runtime_set_suspended(dev);
832 }
833
rz_mtu3_cnt_probe(struct platform_device * pdev)834 static int rz_mtu3_cnt_probe(struct platform_device *pdev)
835 {
836 struct rz_mtu3 *ddata = dev_get_drvdata(pdev->dev.parent);
837 struct device *dev = &pdev->dev;
838 struct counter_device *counter;
839 struct rz_mtu3_channel *ch;
840 struct rz_mtu3_cnt *priv;
841 unsigned int i;
842 int ret;
843
844 counter = devm_counter_alloc(dev, sizeof(*priv));
845 if (!counter)
846 return -ENOMEM;
847
848 priv = counter_priv(counter);
849 priv->clk = ddata->clk;
850 priv->mtu_32bit_max = U32_MAX;
851 priv->ch = &ddata->channels[RZ_MTU3_CHAN_1];
852 ch = &priv->ch[0];
853 for (i = 0; i < RZ_MTU3_MAX_HW_CNTR_CHANNELS; i++) {
854 ch->dev = dev;
855 priv->mtu_16bit_max[i] = U16_MAX;
856 ch++;
857 }
858
859 mutex_init(&priv->lock);
860 platform_set_drvdata(pdev, priv->clk);
861 clk_prepare_enable(priv->clk);
862 pm_runtime_set_active(&pdev->dev);
863 pm_runtime_enable(&pdev->dev);
864 ret = devm_add_action_or_reset(&pdev->dev, rz_mtu3_cnt_pm_disable, dev);
865 if (ret < 0)
866 goto disable_clock;
867
868 counter->name = dev_name(dev);
869 counter->parent = dev;
870 counter->ops = &rz_mtu3_cnt_ops;
871 counter->counts = rz_mtu3_counts;
872 counter->num_counts = ARRAY_SIZE(rz_mtu3_counts);
873 counter->signals = rz_mtu3_signals;
874 counter->num_signals = ARRAY_SIZE(rz_mtu3_signals);
875 counter->ext = rz_mtu3_device_ext;
876 counter->num_ext = ARRAY_SIZE(rz_mtu3_device_ext);
877
878 /* Register Counter device */
879 ret = devm_counter_add(dev, counter);
880 if (ret < 0) {
881 dev_err_probe(dev, ret, "Failed to add counter\n");
882 goto disable_clock;
883 }
884
885 return 0;
886
887 disable_clock:
888 clk_disable_unprepare(priv->clk);
889
890 return ret;
891 }
892
893 static struct platform_driver rz_mtu3_cnt_driver = {
894 .probe = rz_mtu3_cnt_probe,
895 .driver = {
896 .name = "rz-mtu3-counter",
897 .pm = pm_ptr(&rz_mtu3_cnt_pm_ops),
898 },
899 };
900 module_platform_driver(rz_mtu3_cnt_driver);
901
902 MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
903 MODULE_ALIAS("platform:rz-mtu3-counter");
904 MODULE_DESCRIPTION("Renesas RZ/G2L MTU3a counter driver");
905 MODULE_LICENSE("GPL");
906 MODULE_IMPORT_NS(COUNTER);
907