summaryrefslogtreecommitdiff
path: root/drivers/firmware/arm_scmi/power.c
blob: cf7f0312381b1dbb54d24dc798c47b12909dd55d (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
// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface (SCMI) Power Protocol
 *
 * Copyright (C) 2018 ARM Ltd.
 */

#include "common.h"

enum scmi_power_protocol_cmd {
	POWER_DOMAIN_ATTRIBUTES = 0x3,
	POWER_STATE_SET = 0x4,
	POWER_STATE_GET = 0x5,
	POWER_STATE_NOTIFY = 0x6,
	POWER_STATE_CHANGE_REQUESTED_NOTIFY = 0x7,
};

enum scmi_power_protocol_notify {
	POWER_STATE_CHANGED = 0x0,
	POWER_STATE_CHANGE_REQUESTED = 0x1,
};

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))
	    u8 name[SCMI_MAX_STR_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 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;
	int num_domains;
	u64 stats_addr;
	u32 stats_size;
	struct power_dom_info *dom_info;
};

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

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

	attr = t->rx.buf;

	ret = scmi_do_xfer(handle, 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);
	}

	scmi_xfer_put(handle, t);
	return ret;
}

static int
scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
				 struct power_dom_info *dom_info)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_resp_power_domain_attributes *attr;

	ret = scmi_xfer_get_init(handle, POWER_DOMAIN_ATTRIBUTES,
				 SCMI_PROTOCOL_POWER, 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->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);
		strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
	}

	scmi_xfer_put(handle, t);
	return ret;
}

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

	ret = scmi_xfer_get_init(handle, POWER_STATE_SET, SCMI_PROTOCOL_POWER,
				 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 = scmi_do_xfer(handle, t);

	scmi_xfer_put(handle, t);
	return ret;
}

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

	ret = scmi_xfer_get_init(handle, POWER_STATE_GET, SCMI_PROTOCOL_POWER,
				 sizeof(u32), sizeof(u32), &t);
	if (ret)
		return ret;

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

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

	scmi_xfer_put(handle, t);
	return ret;
}

static int scmi_power_num_domains_get(const struct scmi_handle *handle)
{
	struct scmi_power_info *pi = handle->power_priv;

	return pi->num_domains;
}

static char *scmi_power_name_get(const struct scmi_handle *handle, u32 domain)
{
	struct scmi_power_info *pi = handle->power_priv;
	struct power_dom_info *dom = pi->dom_info + domain;

	return dom->name;
}

static struct scmi_power_ops power_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_protocol_init(struct scmi_handle *handle)
{
	int domain;
	u32 version;
	struct scmi_power_info *pinfo;

	scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version);

	dev_dbg(handle->dev, "Power 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_power_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 power_dom_info *dom = pinfo->dom_info + domain;

		scmi_power_domain_attributes_get(handle, domain, dom);
	}

	pinfo->version = version;
	handle->power_ops = &power_ops;
	handle->power_priv = pinfo;

	return 0;
}

static int __init scmi_power_init(void)
{
	return scmi_protocol_register(SCMI_PROTOCOL_POWER,
				      &scmi_power_protocol_init);
}
subsys_initcall(scmi_power_init);