summaryrefslogtreecommitdiffstats
path: root/drivers/firmware/arm_scmi/perf.c
blob: 4a8012e3cb8c3725402ae5388edc978d909af2e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface (SCMI) Performance Protocol
 *
 * Copyright (C) 2018 ARM Ltd.
 */

#include <linux/bits.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/sort.h>

#include "common.h"

enum scmi_performance_protocol_cmd {
	PERF_DOMAIN_ATTRIBUTES = 0x3,
	PERF_DESCRIBE_LEVELS = 0x4,
	PERF_LIMITS_SET = 0x5,
	PERF_LIMITS_GET = 0x6,
	PERF_LEVEL_SET = 0x7,
	PERF_LEVEL_GET = 0x8,
	PERF_NOTIFY_LIMITS = 0x9,
	PERF_NOTIFY_LEVEL = 0xa,
	PERF_DESCRIBE_FASTCHANNEL = 0xb,
};

struct scmi_opp {
	u32 perf;
	u32 power;
	u32 trans_latency_us;
};

struct scmi_msg_resp_perf_attributes {
	__le16 num_domains;
	__le16 flags;
#define POWER_SCALE_IN_MILLIWATT(x)	((x) & BIT(0))
	__le32 stats_addr_low;
	__le32 stats_addr_high;
	__le32 stats_size;
};

struct scmi_msg_resp_perf_domain_attributes {
	__le32 flags;
#define SUPPORTS_SET_LIMITS(x)		((x) & BIT(31))
#define SUPPORTS_SET_PERF_LVL(x)	((x) & BIT(30))
#define SUPPORTS_PERF_LIMIT_NOTIFY(x)	((x) & BIT(29))
#define SUPPORTS_PERF_LEVEL_NOTIFY(x)	((x) & BIT(28))
#define SUPPORTS_PERF_FASTCHANNELS(x)	((x) & BIT(27))
	__le32 rate_limit_us;
	__le32 sustained_freq_khz;
	__le32 sustained_perf_level;
	    u8 name[SCMI_MAX_STR_SIZE];
};

struct scmi_msg_perf_describe_levels {
	__le32 domain;
	__le32 level_index;
};

struct scmi_perf_set_limits {
	__le32 domain;
	__le32 max_level;
	__le32 min_level;
};

struct scmi_perf_get_limits {
	__le32 max_level;
	__le32 min_level;
};

struct scmi_perf_set_level {
	__le32 domain;
	__le32 level;
};

struct scmi_perf_notify_level_or_limits {
	__le32 domain;
	__le32 notify_enable;
};

struct scmi_msg_resp_perf_describe_levels {
	__le16 num_returned;
	__le16 num_remaining;
	struct {
		__le32 perf_val;
		__le32 power;
		__le16 transition_latency_us;
		__le16 reserved;
	} opp[0];
};

struct scmi_perf_get_fc_info {
	__le32 domain;
	__le32 message_id;
};

struct scmi_msg_resp_perf_desc_fc {
	__le32 attr;
#define SUPPORTS_DOORBELL(x)		((x) & BIT(0))
#define DOORBELL_REG_WIDTH(x)		FIELD_GET(GENMASK(2, 1), (x))
	__le32 rate_limit;
	__le32 chan_addr_low;
	__le32 chan_addr_high;
	__le32 chan_size;
	__le32 db_addr_low;
	__le32 db_addr_high;
	__le32 db_set_lmask;
	__le32 db_set_hmask;
	__le32 db_preserve_lmask;
	__le32 db_preserve_hmask;
};

struct scmi_fc_db_info {
	int width;
	u64 set;
	u64 mask;
	void __iomem *addr;
};

struct scmi_fc_info {
	void __iomem *level_set_addr;
	void __iomem *limit_set_addr;
	void __iomem *level_get_addr;
	void __iomem *limit_get_addr;
	struct scmi_fc_db_info *level_set_db;
	struct scmi_fc_db_info *limit_set_db;
};

struct perf_dom_info {
	bool set_limits;
	bool set_perf;
	bool perf_limit_notify;
	bool perf_level_notify;
	bool perf_fastchannels;
	u32 opp_count;
	u32 sustained_freq_khz;
	u32 sustained_perf_level;
	u32 mult_factor;
	char name[SCMI_MAX_STR_SIZE];
	struct scmi_opp opp[MAX_OPPS];
	struct scmi_fc_info *fc_info;
};

struct scmi_perf_info {
	int num_domains;
	bool power_scale_mw;
	u64 stats_addr;
	u32 stats_size;
	struct perf_dom_info *dom_info;
};

static int scmi_perf_attributes_get(const struct scmi_handle *handle,
				    struct scmi_perf_info *pi)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_resp_perf_attributes *attr;

	ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
				 SCMI_PROTOCOL_PERF, 0, sizeof(*attr), &t);
	if (ret)
		return ret;

	attr = t->rx.buf;

	ret = scmi_do_xfer(handle, t);
	if (!ret) {
		u16 flags = le16_to_cpu(attr->flags);

		pi->num_domains = le16_to_cpu(attr->num_domains);
		pi->power_scale_mw = POWER_SCALE_IN_MILLIWATT(flags);
		pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
				(u64)le32_to_cpu(attr->stats_addr_high) << 32;
		pi->stats_size = le32_to_cpu(attr->stats_size);
	}

	scmi_xfer_put(handle, t);
	return ret;
}

static int
scmi_perf_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
				struct perf_dom_info *dom_info)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_resp_perf_domain_attributes *attr;

	ret = scmi_xfer_get_init(handle, PERF_DOMAIN_ATTRIBUTES,
				 SCMI_PROTOCOL_PERF, sizeof(domain),
				 sizeof(*attr), &t);
	if (ret)
		return ret;

	put_unaligned_le32(domain, t->tx.buf);
	attr = t->rx.buf;

	ret = scmi_do_xfer(handle, t);
	if (!ret) {
		u32 flags = le32_to_cpu(attr->flags);

		dom_info->set_limits = SUPPORTS_SET_LIMITS(flags);
		dom_info->set_perf = SUPPORTS_SET_PERF_LVL(flags);
		dom_info->perf_limit_notify = SUPPORTS_PERF_LIMIT_NOTIFY(flags);
		dom_info->perf_level_notify = SUPPORTS_PERF_LEVEL_NOTIFY(flags);
		dom_info->perf_fastchannels = SUPPORTS_PERF_FASTCHANNELS(flags);
		dom_info->sustained_freq_khz =
					le32_to_cpu(attr->sustained_freq_khz);
		dom_info->sustained_perf_level =
					le32_to_cpu(attr->sustained_perf_level);
		if (!dom_info->sustained_freq_khz ||
		    !dom_info->sustained_perf_level)
			/* CPUFreq converts to kHz, hence default 1000 */
			dom_info->mult_factor =	1000;
		else
			dom_info->mult_factor =
					(dom_info->sustained_freq_khz * 1000) /
					dom_info->sustained_perf_level;
		strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
	}

	scmi_xfer_put(handle, t);
	return ret;
}

static int opp_cmp_func(const void *opp1, const void *opp2)
{
	const struct scmi_opp *t1 = opp1, *t2 = opp2;

	return t1->perf - t2->perf;
}

static int
scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain,
			      struct perf_dom_info *perf_dom)
{
	int ret, cnt;
	u32 tot_opp_cnt = 0;
	u16 num_returned, num_remaining;
	struct scmi_xfer *t;
	struct scmi_opp *opp;
	struct scmi_msg_perf_describe_levels *dom_info;
	struct scmi_msg_resp_perf_describe_levels *level_info;

	ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_LEVELS,
				 SCMI_PROTOCOL_PERF, sizeof(*dom_info), 0, &t);
	if (ret)
		return ret;

	dom_info = t->tx.buf;
	level_info = t->rx.buf;

	do {
		dom_info->domain = cpu_to_le32(domain);
		/* Set the number of OPPs to be skipped/already read */
		dom_info->level_index = cpu_to_le32(tot_opp_cnt);

		ret = scmi_do_xfer(handle, t);
		if (ret)
			break;

		num_returned = le16_to_cpu(level_info->num_returned);
		num_remaining = le16_to_cpu(level_info->num_remaining);
		if (tot_opp_cnt + num_returned > MAX_OPPS) {
			dev_err(handle->dev, "No. of OPPs exceeded MAX_OPPS");
			break;
		}

		opp = &perf_dom->opp[tot_opp_cnt];
		for (cnt = 0; cnt < num_returned; cnt++, opp++) {
			opp->perf = le32_to_cpu(level_info->opp[cnt].perf_val);
			opp->power = le32_to_cpu(level_info->opp[cnt].power);
			opp->trans_latency_us = le16_to_cpu
				(level_info->opp[cnt].transition_latency_us);

			dev_dbg(handle->dev, "Level %d Power %d Latency %dus\n",
				opp->perf, opp->power, opp->trans_latency_us);
		}

		tot_opp_cnt += num_returned;
		/*
		 * check for both returned and remaining to avoid infinite
		 * loop due to buggy firmware
		 */
	} while (num_returned && num_remaining);

	perf_dom->opp_count = tot_opp_cnt;
	scmi_xfer_put(handle, t);

	sort(perf_dom->opp, tot_opp_cnt, sizeof(*opp), opp_cmp_func, NULL);
	return ret;
}

#define SCMI_PERF_FC_RING_DB(w)				\
do {							\
	u##w val = 0;					\
							\
	if (db->mask)					\
		val = ioread##w(db->addr) & db->mask;	\
	iowrite##w((u##w)db->set | val, db->addr);	\
} while (0)

static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
{
	if (!db || !db->addr)
		return;

	if (db->width == 1)
		SCMI_PERF_FC_RING_DB(8);
	else if (db->width == 2)
		SCMI_PERF_FC_RING_DB(16);
	else if (db->width == 4)
		SCMI_PERF_FC_RING_DB(32);
	else /* db->width == 8 */
#ifdef CONFIG_64BIT
		SCMI_PERF_FC_RING_DB(64);
#else
	{
		u64 val = 0;

		if (db->mask)
			val = ioread64_hi_lo(db->addr) & db->mask;
		iowrite64_hi_lo(db->set, db->addr);
	}
#endif
}

static int scmi_perf_mb_limits_set(const struct scmi_handle *handle, u32 domain,
				   u32 max_perf, u32 min_perf)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_perf_set_limits *limits;

	ret = scmi_xfer_get_init(handle, PERF_LIMITS_SET, SCMI_PROTOCOL_PERF,
				 sizeof(*limits), 0, &t);
	if (ret)
		return ret;

	limits = t->tx.buf;
	limits->domain = cpu_to_le32(domain);
	limits->max_level = cpu_to_le32(max_perf);
	limits->min_level = cpu_to_le32(min_perf);

	ret = scmi_do_xfer(handle, t);

	scmi_xfer_put(handle, t);
	return ret;
}

static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
				u32 max_perf, u32 min_perf)
{
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom = pi->dom_info + domain;

	if (dom->fc_info && dom->fc_info->limit_set_addr) {
		iowrite32(max_perf, dom->fc_info->limit_set_addr);
		iowrite32(min_perf, dom->fc_info->limit_set_addr + 4);
		scmi_perf_fc_ring_db(dom->fc_info->limit_set_db);
		return 0;
	}

	return scmi_perf_mb_limits_set(handle, domain, max_perf, min_perf);
}

static int scmi_perf_mb_limits_get(const struct scmi_handle *handle, u32 domain,
				   u32 *max_perf, u32 *min_perf)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_perf_get_limits *limits;

	ret = scmi_xfer_get_init(handle, PERF_LIMITS_GET, SCMI_PROTOCOL_PERF,
				 sizeof(__le32), 0, &t);
	if (ret)
		return ret;

	put_unaligned_le32(domain, t->tx.buf);

	ret = scmi_do_xfer(handle, t);
	if (!ret) {
		limits = t->rx.buf;

		*max_perf = le32_to_cpu(limits->max_level);
		*min_perf = le32_to_cpu(limits->min_level);
	}

	scmi_xfer_put(handle, t);
	return ret;
}

static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
				u32 *max_perf, u32 *min_perf)
{
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom = pi->dom_info + domain;

	if (dom->fc_info && dom->fc_info->limit_get_addr) {
		*max_perf = ioread32(dom->fc_info->limit_get_addr);
		*min_perf = ioread32(dom->fc_info->limit_get_addr + 4);
		return 0;
	}

	return scmi_perf_mb_limits_get(handle, domain, max_perf, min_perf);
}

static int scmi_perf_mb_level_set(const struct scmi_handle *handle, u32 domain,
				  u32 level, bool poll)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_perf_set_level *lvl;

	ret = scmi_xfer_get_init(handle, PERF_LEVEL_SET, SCMI_PROTOCOL_PERF,
				 sizeof(*lvl), 0, &t);
	if (ret)
		return ret;

	t->hdr.poll_completion = poll;
	lvl = t->tx.buf;
	lvl->domain = cpu_to_le32(domain);
	lvl->level = cpu_to_le32(level);

	ret = scmi_do_xfer(handle, t);

	scmi_xfer_put(handle, t);
	return ret;
}

static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
			       u32 level, bool poll)
{
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom = pi->dom_info + domain;

	if (dom->fc_info && dom->fc_info->level_set_addr) {
		iowrite32(level, dom->fc_info->level_set_addr);
		scmi_perf_fc_ring_db(dom->fc_info->level_set_db);
		return 0;
	}

	return scmi_perf_mb_level_set(handle, domain, level, poll);
}

static int scmi_perf_mb_level_get(const struct scmi_handle *handle, u32 domain,
				  u32 *level, bool poll)
{
	int ret;
	struct scmi_xfer *t;

	ret = scmi_xfer_get_init(handle, PERF_LEVEL_GET, SCMI_PROTOCOL_PERF,
				 sizeof(u32), sizeof(u32), &t);
	if (ret)
		return ret;

	t->hdr.poll_completion = poll;
	put_unaligned_le32(domain, t->tx.buf);

	ret = scmi_do_xfer(handle, t);
	if (!ret)
		*level = get_unaligned_le32(t->rx.buf);

	scmi_xfer_put(handle, t);
	return ret;
}

static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
			       u32 *level, bool poll)
{
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom = pi->dom_info + domain;

	if (dom->fc_info && dom->fc_info->level_get_addr) {
		*level = ioread32(dom->fc_info->level_get_addr);
		return 0;
	}

	return scmi_perf_mb_level_get(handle, domain, level, poll);
}

static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
{
	if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
		return true;
	if ((msg == PERF_LIMITS_GET || msg == PERF_LIMITS_SET) && size == 8)
		return true;
	return false;
}

static void
scmi_perf_domain_desc_fc(const struct scmi_handle *handle, u32 domain,
			 u32 message_id, void __iomem **p_addr,
			 struct scmi_fc_db_info **p_db)
{
	int ret;
	u32 flags;
	u64 phys_addr;
	u8 size;
	void __iomem *addr;
	struct scmi_xfer *t;
	struct scmi_fc_db_info *db;
	struct scmi_perf_get_fc_info *info;
	struct scmi_msg_resp_perf_desc_fc *resp;

	if (!p_addr)
		return;

	ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_FASTCHANNEL,
				 SCMI_PROTOCOL_PERF,
				 sizeof(*info), sizeof(*resp), &t);
	if (ret)
		return;

	info = t->tx.buf;
	info->domain = cpu_to_le32(domain);
	info->message_id = cpu_to_le32(message_id);

	ret = scmi_do_xfer(handle, t);
	if (ret)
		goto err_xfer;

	resp = t->rx.buf;
	flags = le32_to_cpu(resp->attr);
	size = le32_to_cpu(resp->chan_size);
	if (!scmi_perf_fc_size_is_valid(message_id, size))
		goto err_xfer;

	phys_addr = le32_to_cpu(resp->chan_addr_low);
	phys_addr |= (u64)le32_to_cpu(resp->chan_addr_high) << 32;
	addr = devm_ioremap(handle->dev, phys_addr, size);
	if (!addr)
		goto err_xfer;
	*p_addr = addr;

	if (p_db && SUPPORTS_DOORBELL(flags)) {
		db = devm_kzalloc(handle->dev, sizeof(*db), GFP_KERNEL);
		if (!db)
			goto err_xfer;

		size = 1 << DOORBELL_REG_WIDTH(flags);
		phys_addr = le32_to_cpu(resp->db_addr_low);
		phys_addr |= (u64)le32_to_cpu(resp->db_addr_high) << 32;
		addr = devm_ioremap(handle->dev, phys_addr, size);
		if (!addr)
			goto err_xfer;

		db->addr = addr;
		db->width = size;
		db->set = le32_to_cpu(resp->db_set_lmask);
		db->set |= (u64)le32_to_cpu(resp->db_set_hmask) << 32;
		db->mask = le32_to_cpu(resp->db_preserve_lmask);
		db->mask |= (u64)le32_to_cpu(resp->db_preserve_hmask) << 32;
		*p_db = db;
	}
err_xfer:
	scmi_xfer_put(handle, t);
}

static void scmi_perf_domain_init_fc(const struct scmi_handle *handle,
				     u32 domain, struct scmi_fc_info **p_fc)
{
	struct scmi_fc_info *fc;

	fc = devm_kzalloc(handle->dev, sizeof(*fc), GFP_KERNEL);
	if (!fc)
		return;

	scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_SET,
				 &fc->level_set_addr, &fc->level_set_db);
	scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_GET,
				 &fc->level_get_addr, NULL);
	scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_SET,
				 &fc->limit_set_addr, &fc->limit_set_db);
	scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_GET,
				 &fc->limit_get_addr, NULL);
	*p_fc = fc;
}

/* Device specific ops */
static int scmi_dev_domain_id(struct device *dev)
{
	struct of_phandle_args clkspec;

	if (of_parse_phandle_with_args(dev->of_node, "clocks", "#clock-cells",
				       0, &clkspec))
		return -EINVAL;

	return clkspec.args[0];
}

static int scmi_dvfs_device_opps_add(const struct scmi_handle *handle,
				     struct device *dev)
{
	int idx, ret, domain;
	unsigned long freq;
	struct scmi_opp *opp;
	struct perf_dom_info *dom;
	struct scmi_perf_info *pi = handle->perf_priv;

	domain = scmi_dev_domain_id(dev);
	if (domain < 0)
		return domain;

	dom = pi->dom_info + domain;

	for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
		freq = opp->perf * dom->mult_factor;

		ret = dev_pm_opp_add(dev, freq, 0);
		if (ret) {
			dev_warn(dev, "failed to add opp %luHz\n", freq);

			while (idx-- > 0) {
				freq = (--opp)->perf * dom->mult_factor;
				dev_pm_opp_remove(dev, freq);
			}
			return ret;
		}
	}
	return 0;
}

static int scmi_dvfs_transition_latency_get(const struct scmi_handle *handle,
					    struct device *dev)
{
	struct perf_dom_info *dom;
	struct scmi_perf_info *pi = handle->perf_priv;
	int domain = scmi_dev_domain_id(dev);

	if (domain < 0)
		return domain;

	dom = pi->dom_info + domain;
	/* uS to nS */
	return dom->opp[dom->opp_count - 1].trans_latency_us * 1000;
}

static int scmi_dvfs_freq_set(const struct scmi_handle *handle, u32 domain,
			      unsigned long freq, bool poll)
{
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom = pi->dom_info + domain;

	return scmi_perf_level_set(handle, domain, freq / dom->mult_factor,
				   poll);
}

static int scmi_dvfs_freq_get(const struct scmi_handle *handle, u32 domain,
			      unsigned long *freq, bool poll)
{
	int ret;
	u32 level;
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom = pi->dom_info + domain;

	ret = scmi_perf_level_get(handle, domain, &level, poll);
	if (!ret)
		*freq = level * dom->mult_factor;

	return ret;
}

static int scmi_dvfs_est_power_get(const struct scmi_handle *handle, u32 domain,
				   unsigned long *freq, unsigned long *power)
{
	struct scmi_perf_info *pi = handle->perf_priv;
	struct perf_dom_info *dom;
	unsigned long opp_freq;
	int idx, ret = -EINVAL;
	struct scmi_opp *opp;

	dom = pi->dom_info + domain;
	if (!dom)
		return -EIO;

	for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
		opp_freq = opp->perf * dom->mult_factor;
		if (opp_freq < *freq)
			continue;

		*freq = opp_freq;
		*power = opp->power;
		ret = 0;
		break;
	}

	return ret;
}

static struct scmi_perf_ops perf_ops = {
	.limits_set = scmi_perf_limits_set,
	.limits_get = scmi_perf_limits_get,
	.level_set = scmi_perf_level_set,
	.level_get = scmi_perf_level_get,
	.device_domain_id = scmi_dev_domain_id,
	.transition_latency_get = scmi_dvfs_transition_latency_get,
	.device_opps_add = scmi_dvfs_device_opps_add,
	.freq_set = scmi_dvfs_freq_set,
	.freq_get = scmi_dvfs_freq_get,
	.est_power_get = scmi_dvfs_est_power_get,
};

static int scmi_perf_protocol_init(struct scmi_handle *handle)
{
	int domain;
	u32 version;
	struct scmi_perf_info *pinfo;

	scmi_version_get(handle, SCMI_PROTOCOL_PERF, &version);

	dev_dbg(handle->dev, "Performance Version %d.%d\n",
		PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));

	pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
	if (!pinfo)
		return -ENOMEM;

	scmi_perf_attributes_get(handle, pinfo);

	pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
				       sizeof(*pinfo->dom_info), GFP_KERNEL);
	if (!pinfo->dom_info)
		return -ENOMEM;

	for (domain = 0; domain < pinfo->num_domains; domain++) {
		struct perf_dom_info *dom = pinfo->dom_info + domain;

		scmi_perf_domain_attributes_get(handle, domain, dom);
		scmi_perf_describe_levels_get(handle, domain, dom);

		if (dom->perf_fastchannels)
			scmi_perf_domain_init_fc(handle, domain, &dom->fc_info);
	}

	handle->perf_ops = &perf_ops;
	handle->perf_priv = pinfo;

	return 0;
}

static int __init scmi_perf_init(void)
{
	return scmi_protocol_register(SCMI_PROTOCOL_PERF,
				      &scmi_perf_protocol_init);
}
subsys_initcall(scmi_perf_init);