summaryrefslogtreecommitdiffstats
path: root/drivers/firmware/arm_scmi/power.c
blob: 49666bd1d8ac0c4efcba123aa365416068a3b50c (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
// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface (SCMI) Power Protocol
 *
 * Copyright (C) 2018-2022 ARM Ltd.
 */

#define pr_fmt(fmt) "SCMI Notifications POWER - " fmt

#include <linux/module.h>
#include <linux/scmi_protocol.h>

#include "protocols.h"
#include "notify.h"

/* Updated only after ALL the mandatory features for that version are merged */
#define SCMI_PROTOCOL_SUPPORTED_VERSION		0x30000

enum scmi_power_protocol_cmd {
	POWER_DOMAIN_ATTRIBUTES = 0x3,
	POWER_STATE_SET = 0x4,
	POWER_STATE_GET = 0x5,
	POWER_STATE_NOTIFY = 0x6,
	POWER_DOMAIN_NAME_GET = 0x8,
};

struct scmi_msg_resp_power_attributes {
	__le16 num_domains;
	__le16 reserved;
	__le32 stats_addr_low;
	__le32 stats_addr_high;
	__le32 stats_size;
};

struct scmi_msg_resp_power_domain_attributes {
	__le32 flags;
#define SUPPORTS_STATE_SET_NOTIFY(x)	((x) & BIT(31))
#define SUPPORTS_STATE_SET_ASYNC(x)	((x) & BIT(30))
#define SUPPORTS_STATE_SET_SYNC(x)	((x) & BIT(29))
#define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(27))
	    u8 name[SCMI_SHORT_NAME_MAX_SIZE];
};

struct scmi_power_set_state {
	__le32 flags;
#define STATE_SET_ASYNC		BIT(0)
	__le32 domain;
	__le32 state;
};

struct scmi_power_state_notify {
	__le32 domain;
	__le32 notify_enable;
};

struct scmi_power_state_notify_payld {
	__le32 agent_id;
	__le32 domain_id;
	__le32 power_state;
};

struct power_dom_info {
	bool state_set_sync;
	bool state_set_async;
	bool state_set_notify;
	char name[SCMI_MAX_STR_SIZE];
};

struct scmi_power_info {
	u32 version;
	bool notify_state_change_cmd;
	int num_domains;
	u64 stats_addr;
	u32 stats_size;
	struct power_dom_info *dom_info;
};

static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
				     struct scmi_power_info *pi)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_resp_power_attributes *attr;

	ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
				      0, sizeof(*attr), &t);
	if (ret)
		return ret;

	attr = t->rx.buf;

	ret = ph->xops->do_xfer(ph, t);
	if (!ret) {
		pi->num_domains = le16_to_cpu(attr->num_domains);
		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);
	}

	ph->xops->xfer_put(ph, t);

	if (!ret)
		if (!ph->hops->protocol_msg_check(ph, POWER_STATE_NOTIFY, NULL))
			pi->notify_state_change_cmd = true;

	return ret;
}

static int
scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
				 u32 domain, struct power_dom_info *dom_info,
				 u32 version, bool notify_state_change_cmd)
{
	int ret;
	u32 flags;
	struct scmi_xfer *t;
	struct scmi_msg_resp_power_domain_attributes *attr;

	ret = ph->xops->xfer_get_init(ph, POWER_DOMAIN_ATTRIBUTES,
				      sizeof(domain), sizeof(*attr), &t);
	if (ret)
		return ret;

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

	ret = ph->xops->do_xfer(ph, t);
	if (!ret) {
		flags = le32_to_cpu(attr->flags);

		if (notify_state_change_cmd)
			dom_info->state_set_notify =
				SUPPORTS_STATE_SET_NOTIFY(flags);
		dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
		dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
		strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
	}
	ph->xops->xfer_put(ph, t);

	/*
	 * If supported overwrite short name with the extended one;
	 * on error just carry on and use already provided short name.
	 */
	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
	    SUPPORTS_EXTENDED_NAMES(flags)) {
		ph->hops->extended_name_get(ph, POWER_DOMAIN_NAME_GET,
					    domain, NULL, dom_info->name,
					    SCMI_MAX_STR_SIZE);
	}

	return ret;
}

static int scmi_power_state_set(const struct scmi_protocol_handle *ph,
				u32 domain, u32 state)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_power_set_state *st;

	ret = ph->xops->xfer_get_init(ph, POWER_STATE_SET, sizeof(*st), 0, &t);
	if (ret)
		return ret;

	st = t->tx.buf;
	st->flags = cpu_to_le32(0);
	st->domain = cpu_to_le32(domain);
	st->state = cpu_to_le32(state);

	ret = ph->xops->do_xfer(ph, t);

	ph->xops->xfer_put(ph, t);
	return ret;
}

static int scmi_power_state_get(const struct scmi_protocol_handle *ph,
				u32 domain, u32 *state)
{
	int ret;
	struct scmi_xfer *t;

	ret = ph->xops->xfer_get_init(ph, POWER_STATE_GET, sizeof(u32), sizeof(u32), &t);
	if (ret)
		return ret;

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

	ret = ph->xops->do_xfer(ph, t);
	if (!ret)
		*state = get_unaligned_le32(t->rx.buf);

	ph->xops->xfer_put(ph, t);
	return ret;
}

static int scmi_power_num_domains_get(const struct scmi_protocol_handle *ph)
{
	struct scmi_power_info *pi = ph->get_priv(ph);

	return pi->num_domains;
}

static const char *
scmi_power_name_get(const struct scmi_protocol_handle *ph,
		    u32 domain)
{
	struct scmi_power_info *pi = ph->get_priv(ph);
	struct power_dom_info *dom = pi->dom_info + domain;

	return dom->name;
}

static const struct scmi_power_proto_ops power_proto_ops = {
	.num_domains_get = scmi_power_num_domains_get,
	.name_get = scmi_power_name_get,
	.state_set = scmi_power_state_set,
	.state_get = scmi_power_state_get,
};

static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
				     u32 domain, bool enable)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_power_state_notify *notify;

	ret = ph->xops->xfer_get_init(ph, POWER_STATE_NOTIFY,
				      sizeof(*notify), 0, &t);
	if (ret)
		return ret;

	notify = t->tx.buf;
	notify->domain = cpu_to_le32(domain);
	notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;

	ret = ph->xops->do_xfer(ph, t);

	ph->xops->xfer_put(ph, t);
	return ret;
}

static bool scmi_power_notify_supported(const struct scmi_protocol_handle *ph,
					u8 evt_id, u32 src_id)
{
	struct power_dom_info *dom;
	struct scmi_power_info *pinfo = ph->get_priv(ph);

	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED ||
	    src_id >= pinfo->num_domains)
		return false;

	dom = pinfo->dom_info + src_id;
	return dom->state_set_notify;
}

static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
					 u8 evt_id, u32 src_id, bool enable)
{
	int ret;

	ret = scmi_power_request_notify(ph, src_id, enable);
	if (ret)
		pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
			 evt_id, src_id, ret);

	return ret;
}

static void *
scmi_power_fill_custom_report(const struct scmi_protocol_handle *ph,
			      u8 evt_id, ktime_t timestamp,
			      const void *payld, size_t payld_sz,
			      void *report, u32 *src_id)
{
	const struct scmi_power_state_notify_payld *p = payld;
	struct scmi_power_state_changed_report *r = report;

	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED || sizeof(*p) != payld_sz)
		return NULL;

	r->timestamp = timestamp;
	r->agent_id = le32_to_cpu(p->agent_id);
	r->domain_id = le32_to_cpu(p->domain_id);
	r->power_state = le32_to_cpu(p->power_state);
	*src_id = r->domain_id;

	return r;
}

static int scmi_power_get_num_sources(const struct scmi_protocol_handle *ph)
{
	struct scmi_power_info *pinfo = ph->get_priv(ph);

	if (!pinfo)
		return -EINVAL;

	return pinfo->num_domains;
}

static const struct scmi_event power_events[] = {
	{
		.id = SCMI_EVENT_POWER_STATE_CHANGED,
		.max_payld_sz = sizeof(struct scmi_power_state_notify_payld),
		.max_report_sz =
			sizeof(struct scmi_power_state_changed_report),
	},
};

static const struct scmi_event_ops power_event_ops = {
	.is_notify_supported = scmi_power_notify_supported,
	.get_num_sources = scmi_power_get_num_sources,
	.set_notify_enabled = scmi_power_set_notify_enabled,
	.fill_custom_report = scmi_power_fill_custom_report,
};

static const struct scmi_protocol_events power_protocol_events = {
	.queue_sz = SCMI_PROTO_QUEUE_SZ,
	.ops = &power_event_ops,
	.evts = power_events,
	.num_events = ARRAY_SIZE(power_events),
};

static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
{
	int domain, ret;
	u32 version;
	struct scmi_power_info *pinfo;

	ret = ph->xops->version_get(ph, &version);
	if (ret)
		return ret;

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

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

	ret = scmi_power_attributes_get(ph, pinfo);
	if (ret)
		return ret;

	pinfo->dom_info = devm_kcalloc(ph->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 power_dom_info *dom = pinfo->dom_info + domain;

		scmi_power_domain_attributes_get(ph, domain, dom, version,
						 pinfo->notify_state_change_cmd);
	}

	pinfo->version = version;

	return ph->set_priv(ph, pinfo, version);
}

static const struct scmi_protocol scmi_power = {
	.id = SCMI_PROTOCOL_POWER,
	.owner = THIS_MODULE,
	.instance_init = &scmi_power_protocol_init,
	.ops = &power_proto_ops,
	.events = &power_protocol_events,
	.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
};

DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(power, scmi_power)