1 // SPDX-License-Identifier: GPL-2.0
3 * System Control and Management Interface (SCMI) Power Protocol
5 * Copyright (C) 2018 ARM Ltd.
10 enum scmi_power_protocol_cmd {
11 POWER_DOMAIN_ATTRIBUTES = 0x3,
12 POWER_STATE_SET = 0x4,
13 POWER_STATE_GET = 0x5,
14 POWER_STATE_NOTIFY = 0x6,
17 struct scmi_msg_resp_power_attributes {
20 __le32 stats_addr_low;
21 __le32 stats_addr_high;
25 struct scmi_msg_resp_power_domain_attributes {
27 #define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31))
28 #define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30))
29 #define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29))
30 u8 name[SCMI_MAX_STR_SIZE];
33 struct scmi_power_set_state {
35 #define STATE_SET_ASYNC BIT(0)
40 struct scmi_power_state_notify {
45 struct power_dom_info {
48 bool state_set_notify;
49 char name[SCMI_MAX_STR_SIZE];
52 struct scmi_power_info {
57 struct power_dom_info *dom_info;
60 static int scmi_power_attributes_get(const struct scmi_handle *handle,
61 struct scmi_power_info *pi)
65 struct scmi_msg_resp_power_attributes *attr;
67 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
68 SCMI_PROTOCOL_POWER, 0, sizeof(*attr), &t);
74 ret = scmi_do_xfer(handle, t);
76 pi->num_domains = le16_to_cpu(attr->num_domains);
77 pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
78 (u64)le32_to_cpu(attr->stats_addr_high) << 32;
79 pi->stats_size = le32_to_cpu(attr->stats_size);
82 scmi_xfer_put(handle, t);
87 scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
88 struct power_dom_info *dom_info)
92 struct scmi_msg_resp_power_domain_attributes *attr;
94 ret = scmi_xfer_get_init(handle, POWER_DOMAIN_ATTRIBUTES,
95 SCMI_PROTOCOL_POWER, sizeof(domain),
100 put_unaligned_le32(domain, t->tx.buf);
103 ret = scmi_do_xfer(handle, t);
105 u32 flags = le32_to_cpu(attr->flags);
107 dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
108 dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
109 dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
110 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
113 scmi_xfer_put(handle, t);
118 scmi_power_state_set(const struct scmi_handle *handle, u32 domain, u32 state)
122 struct scmi_power_set_state *st;
124 ret = scmi_xfer_get_init(handle, POWER_STATE_SET, SCMI_PROTOCOL_POWER,
130 st->flags = cpu_to_le32(0);
131 st->domain = cpu_to_le32(domain);
132 st->state = cpu_to_le32(state);
134 ret = scmi_do_xfer(handle, t);
136 scmi_xfer_put(handle, t);
141 scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state)
146 ret = scmi_xfer_get_init(handle, POWER_STATE_GET, SCMI_PROTOCOL_POWER,
147 sizeof(u32), sizeof(u32), &t);
151 put_unaligned_le32(domain, t->tx.buf);
153 ret = scmi_do_xfer(handle, t);
155 *state = get_unaligned_le32(t->rx.buf);
157 scmi_xfer_put(handle, t);
161 static int scmi_power_num_domains_get(const struct scmi_handle *handle)
163 struct scmi_power_info *pi = handle->power_priv;
165 return pi->num_domains;
168 static char *scmi_power_name_get(const struct scmi_handle *handle, u32 domain)
170 struct scmi_power_info *pi = handle->power_priv;
171 struct power_dom_info *dom = pi->dom_info + domain;
176 static struct scmi_power_ops power_ops = {
177 .num_domains_get = scmi_power_num_domains_get,
178 .name_get = scmi_power_name_get,
179 .state_set = scmi_power_state_set,
180 .state_get = scmi_power_state_get,
183 static int scmi_power_protocol_init(struct scmi_handle *handle)
187 struct scmi_power_info *pinfo;
189 scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version);
191 dev_dbg(handle->dev, "Power Version %d.%d\n",
192 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
194 pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
198 scmi_power_attributes_get(handle, pinfo);
200 pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
201 sizeof(*pinfo->dom_info), GFP_KERNEL);
202 if (!pinfo->dom_info)
205 for (domain = 0; domain < pinfo->num_domains; domain++) {
206 struct power_dom_info *dom = pinfo->dom_info + domain;
208 scmi_power_domain_attributes_get(handle, domain, dom);
211 pinfo->version = version;
212 handle->power_ops = &power_ops;
213 handle->power_priv = pinfo;
218 static int __init scmi_power_init(void)
220 return scmi_protocol_register(SCMI_PROTOCOL_POWER,
221 &scmi_power_protocol_init);
223 subsys_initcall(scmi_power_init);