1 // SPDX-License-Identifier: GPL-2.0
3 * System Control and Management Interface (SCMI) Power Protocol
5 * Copyright (C) 2018-2022 ARM Ltd.
8 #define pr_fmt(fmt) "SCMI Notifications POWER - " fmt
10 #include <linux/module.h>
11 #include <linux/scmi_protocol.h>
13 #include "protocols.h"
16 /* Updated only after ALL the mandatory features for that version are merged */
17 #define SCMI_PROTOCOL_SUPPORTED_VERSION 0x30000
19 enum scmi_power_protocol_cmd {
20 POWER_DOMAIN_ATTRIBUTES = 0x3,
21 POWER_STATE_SET = 0x4,
22 POWER_STATE_GET = 0x5,
23 POWER_STATE_NOTIFY = 0x6,
24 POWER_DOMAIN_NAME_GET = 0x8,
27 struct scmi_msg_resp_power_attributes {
30 __le32 stats_addr_low;
31 __le32 stats_addr_high;
35 struct scmi_msg_resp_power_domain_attributes {
37 #define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31))
38 #define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30))
39 #define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29))
40 #define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(27))
41 u8 name[SCMI_SHORT_NAME_MAX_SIZE];
44 struct scmi_power_set_state {
46 #define STATE_SET_ASYNC BIT(0)
51 struct scmi_power_state_notify {
56 struct scmi_power_state_notify_payld {
62 struct power_dom_info {
65 bool state_set_notify;
66 char name[SCMI_MAX_STR_SIZE];
69 struct scmi_power_info {
74 struct power_dom_info *dom_info;
77 static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
78 struct scmi_power_info *pi)
82 struct scmi_msg_resp_power_attributes *attr;
84 ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
85 0, sizeof(*attr), &t);
91 ret = ph->xops->do_xfer(ph, t);
93 pi->num_domains = le16_to_cpu(attr->num_domains);
94 pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
95 (u64)le32_to_cpu(attr->stats_addr_high) << 32;
96 pi->stats_size = le32_to_cpu(attr->stats_size);
99 ph->xops->xfer_put(ph, t);
104 scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
105 u32 domain, struct power_dom_info *dom_info,
111 struct scmi_msg_resp_power_domain_attributes *attr;
113 ret = ph->xops->xfer_get_init(ph, POWER_DOMAIN_ATTRIBUTES,
114 sizeof(domain), sizeof(*attr), &t);
118 put_unaligned_le32(domain, t->tx.buf);
121 ret = ph->xops->do_xfer(ph, t);
123 flags = le32_to_cpu(attr->flags);
125 dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
126 dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
127 dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
128 strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
130 ph->xops->xfer_put(ph, t);
133 * If supported overwrite short name with the extended one;
134 * on error just carry on and use already provided short name.
136 if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
137 SUPPORTS_EXTENDED_NAMES(flags)) {
138 ph->hops->extended_name_get(ph, POWER_DOMAIN_NAME_GET,
139 domain, NULL, dom_info->name,
146 static int scmi_power_state_set(const struct scmi_protocol_handle *ph,
147 u32 domain, u32 state)
151 struct scmi_power_set_state *st;
153 ret = ph->xops->xfer_get_init(ph, POWER_STATE_SET, sizeof(*st), 0, &t);
158 st->flags = cpu_to_le32(0);
159 st->domain = cpu_to_le32(domain);
160 st->state = cpu_to_le32(state);
162 ret = ph->xops->do_xfer(ph, t);
164 ph->xops->xfer_put(ph, t);
168 static int scmi_power_state_get(const struct scmi_protocol_handle *ph,
169 u32 domain, u32 *state)
174 ret = ph->xops->xfer_get_init(ph, POWER_STATE_GET, sizeof(u32), sizeof(u32), &t);
178 put_unaligned_le32(domain, t->tx.buf);
180 ret = ph->xops->do_xfer(ph, t);
182 *state = get_unaligned_le32(t->rx.buf);
184 ph->xops->xfer_put(ph, t);
188 static int scmi_power_num_domains_get(const struct scmi_protocol_handle *ph)
190 struct scmi_power_info *pi = ph->get_priv(ph);
192 return pi->num_domains;
196 scmi_power_name_get(const struct scmi_protocol_handle *ph,
199 struct scmi_power_info *pi = ph->get_priv(ph);
200 struct power_dom_info *dom = pi->dom_info + domain;
205 static const struct scmi_power_proto_ops power_proto_ops = {
206 .num_domains_get = scmi_power_num_domains_get,
207 .name_get = scmi_power_name_get,
208 .state_set = scmi_power_state_set,
209 .state_get = scmi_power_state_get,
212 static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
213 u32 domain, bool enable)
217 struct scmi_power_state_notify *notify;
219 ret = ph->xops->xfer_get_init(ph, POWER_STATE_NOTIFY,
220 sizeof(*notify), 0, &t);
225 notify->domain = cpu_to_le32(domain);
226 notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
228 ret = ph->xops->do_xfer(ph, t);
230 ph->xops->xfer_put(ph, t);
234 static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
235 u8 evt_id, u32 src_id, bool enable)
239 ret = scmi_power_request_notify(ph, src_id, enable);
241 pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
242 evt_id, src_id, ret);
248 scmi_power_fill_custom_report(const struct scmi_protocol_handle *ph,
249 u8 evt_id, ktime_t timestamp,
250 const void *payld, size_t payld_sz,
251 void *report, u32 *src_id)
253 const struct scmi_power_state_notify_payld *p = payld;
254 struct scmi_power_state_changed_report *r = report;
256 if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED || sizeof(*p) != payld_sz)
259 r->timestamp = timestamp;
260 r->agent_id = le32_to_cpu(p->agent_id);
261 r->domain_id = le32_to_cpu(p->domain_id);
262 r->power_state = le32_to_cpu(p->power_state);
263 *src_id = r->domain_id;
268 static int scmi_power_get_num_sources(const struct scmi_protocol_handle *ph)
270 struct scmi_power_info *pinfo = ph->get_priv(ph);
275 return pinfo->num_domains;
278 static const struct scmi_event power_events[] = {
280 .id = SCMI_EVENT_POWER_STATE_CHANGED,
281 .max_payld_sz = sizeof(struct scmi_power_state_notify_payld),
283 sizeof(struct scmi_power_state_changed_report),
287 static const struct scmi_event_ops power_event_ops = {
288 .get_num_sources = scmi_power_get_num_sources,
289 .set_notify_enabled = scmi_power_set_notify_enabled,
290 .fill_custom_report = scmi_power_fill_custom_report,
293 static const struct scmi_protocol_events power_protocol_events = {
294 .queue_sz = SCMI_PROTO_QUEUE_SZ,
295 .ops = &power_event_ops,
296 .evts = power_events,
297 .num_events = ARRAY_SIZE(power_events),
300 static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
304 struct scmi_power_info *pinfo;
306 ret = ph->xops->version_get(ph, &version);
310 dev_dbg(ph->dev, "Power Version %d.%d\n",
311 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
313 pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
317 ret = scmi_power_attributes_get(ph, pinfo);
321 pinfo->dom_info = devm_kcalloc(ph->dev, pinfo->num_domains,
322 sizeof(*pinfo->dom_info), GFP_KERNEL);
323 if (!pinfo->dom_info)
326 for (domain = 0; domain < pinfo->num_domains; domain++) {
327 struct power_dom_info *dom = pinfo->dom_info + domain;
329 scmi_power_domain_attributes_get(ph, domain, dom, version);
332 pinfo->version = version;
334 return ph->set_priv(ph, pinfo, version);
337 static const struct scmi_protocol scmi_power = {
338 .id = SCMI_PROTOCOL_POWER,
339 .owner = THIS_MODULE,
340 .instance_init = &scmi_power_protocol_init,
341 .ops = &power_proto_ops,
342 .events = &power_protocol_events,
343 .supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
346 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(power, scmi_power)