1 // SPDX-License-Identifier: GPL-2.0
3 * System Control and Management Interface (SCMI) Power Protocol
5 * Copyright (C) 2018 ARM Ltd.
8 #define pr_fmt(fmt) "SCMI Notifications POWER - " fmt
10 #include <linux/scmi_protocol.h>
15 enum scmi_power_protocol_cmd {
16 POWER_DOMAIN_ATTRIBUTES = 0x3,
17 POWER_STATE_SET = 0x4,
18 POWER_STATE_GET = 0x5,
19 POWER_STATE_NOTIFY = 0x6,
22 struct scmi_msg_resp_power_attributes {
25 __le32 stats_addr_low;
26 __le32 stats_addr_high;
30 struct scmi_msg_resp_power_domain_attributes {
32 #define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31))
33 #define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30))
34 #define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29))
35 u8 name[SCMI_MAX_STR_SIZE];
38 struct scmi_power_set_state {
40 #define STATE_SET_ASYNC BIT(0)
45 struct scmi_power_state_notify {
50 struct scmi_power_state_notify_payld {
56 struct power_dom_info {
59 bool state_set_notify;
60 char name[SCMI_MAX_STR_SIZE];
63 struct scmi_power_info {
68 struct power_dom_info *dom_info;
71 static int scmi_power_attributes_get(const struct scmi_handle *handle,
72 struct scmi_power_info *pi)
76 struct scmi_msg_resp_power_attributes *attr;
78 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
79 SCMI_PROTOCOL_POWER, 0, sizeof(*attr), &t);
85 ret = scmi_do_xfer(handle, t);
87 pi->num_domains = le16_to_cpu(attr->num_domains);
88 pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
89 (u64)le32_to_cpu(attr->stats_addr_high) << 32;
90 pi->stats_size = le32_to_cpu(attr->stats_size);
93 scmi_xfer_put(handle, t);
98 scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
99 struct power_dom_info *dom_info)
103 struct scmi_msg_resp_power_domain_attributes *attr;
105 ret = scmi_xfer_get_init(handle, POWER_DOMAIN_ATTRIBUTES,
106 SCMI_PROTOCOL_POWER, sizeof(domain),
111 put_unaligned_le32(domain, t->tx.buf);
114 ret = scmi_do_xfer(handle, t);
116 u32 flags = le32_to_cpu(attr->flags);
118 dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
119 dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
120 dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
121 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
124 scmi_xfer_put(handle, t);
129 scmi_power_state_set(const struct scmi_handle *handle, u32 domain, u32 state)
133 struct scmi_power_set_state *st;
135 ret = scmi_xfer_get_init(handle, POWER_STATE_SET, SCMI_PROTOCOL_POWER,
141 st->flags = cpu_to_le32(0);
142 st->domain = cpu_to_le32(domain);
143 st->state = cpu_to_le32(state);
145 ret = scmi_do_xfer(handle, t);
147 scmi_xfer_put(handle, t);
152 scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state)
157 ret = scmi_xfer_get_init(handle, POWER_STATE_GET, SCMI_PROTOCOL_POWER,
158 sizeof(u32), sizeof(u32), &t);
162 put_unaligned_le32(domain, t->tx.buf);
164 ret = scmi_do_xfer(handle, t);
166 *state = get_unaligned_le32(t->rx.buf);
168 scmi_xfer_put(handle, t);
172 static int scmi_power_num_domains_get(const struct scmi_handle *handle)
174 struct scmi_power_info *pi = handle->power_priv;
176 return pi->num_domains;
179 static char *scmi_power_name_get(const struct scmi_handle *handle, u32 domain)
181 struct scmi_power_info *pi = handle->power_priv;
182 struct power_dom_info *dom = pi->dom_info + domain;
187 static const struct scmi_power_ops power_ops = {
188 .num_domains_get = scmi_power_num_domains_get,
189 .name_get = scmi_power_name_get,
190 .state_set = scmi_power_state_set,
191 .state_get = scmi_power_state_get,
194 static int scmi_power_request_notify(const struct scmi_handle *handle,
195 u32 domain, bool enable)
199 struct scmi_power_state_notify *notify;
201 ret = scmi_xfer_get_init(handle, POWER_STATE_NOTIFY,
202 SCMI_PROTOCOL_POWER, sizeof(*notify), 0, &t);
207 notify->domain = cpu_to_le32(domain);
208 notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
210 ret = scmi_do_xfer(handle, t);
212 scmi_xfer_put(handle, t);
216 static int scmi_power_set_notify_enabled(const struct scmi_handle *handle,
217 u8 evt_id, u32 src_id, bool enable)
221 ret = scmi_power_request_notify(handle, src_id, enable);
223 pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
224 evt_id, src_id, ret);
229 static void *scmi_power_fill_custom_report(const struct scmi_handle *handle,
230 u8 evt_id, ktime_t timestamp,
231 const void *payld, size_t payld_sz,
232 void *report, u32 *src_id)
234 const struct scmi_power_state_notify_payld *p = payld;
235 struct scmi_power_state_changed_report *r = report;
237 if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED || sizeof(*p) != payld_sz)
240 r->timestamp = timestamp;
241 r->agent_id = le32_to_cpu(p->agent_id);
242 r->domain_id = le32_to_cpu(p->domain_id);
243 r->power_state = le32_to_cpu(p->power_state);
244 *src_id = r->domain_id;
249 static const struct scmi_event power_events[] = {
251 .id = SCMI_EVENT_POWER_STATE_CHANGED,
252 .max_payld_sz = sizeof(struct scmi_power_state_notify_payld),
254 sizeof(struct scmi_power_state_changed_report),
258 static const struct scmi_event_ops power_event_ops = {
259 .set_notify_enabled = scmi_power_set_notify_enabled,
260 .fill_custom_report = scmi_power_fill_custom_report,
263 static int scmi_power_protocol_init(struct scmi_handle *handle)
267 struct scmi_power_info *pinfo;
269 scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version);
271 dev_dbg(handle->dev, "Power Version %d.%d\n",
272 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
274 pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
278 scmi_power_attributes_get(handle, pinfo);
280 pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
281 sizeof(*pinfo->dom_info), GFP_KERNEL);
282 if (!pinfo->dom_info)
285 for (domain = 0; domain < pinfo->num_domains; domain++) {
286 struct power_dom_info *dom = pinfo->dom_info + domain;
288 scmi_power_domain_attributes_get(handle, domain, dom);
291 scmi_register_protocol_events(handle,
292 SCMI_PROTOCOL_POWER, SCMI_PROTO_QUEUE_SZ,
293 &power_event_ops, power_events,
294 ARRAY_SIZE(power_events),
297 pinfo->version = version;
298 handle->power_ops = &power_ops;
299 handle->power_priv = pinfo;
304 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(SCMI_PROTOCOL_POWER, power)