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55716d26 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
f721889f RW |
2 | /* |
3 | * pm_domain.h - Definitions and headers related to device power domains. | |
4 | * | |
5 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
f721889f RW |
6 | */ |
7 | ||
8 | #ifndef _LINUX_PM_DOMAIN_H | |
9 | #define _LINUX_PM_DOMAIN_H | |
10 | ||
11 | #include <linux/device.h> | |
67e3242e | 12 | #include <linux/ktime.h> |
313162d0 PG |
13 | #include <linux/mutex.h> |
14 | #include <linux/pm.h> | |
4f042cda | 15 | #include <linux/err.h> |
c8aa130b | 16 | #include <linux/of.h> |
6ff7bb0d | 17 | #include <linux/notifier.h> |
d716f479 | 18 | #include <linux/spinlock.h> |
eb594b73 | 19 | #include <linux/cpumask.h> |
f721889f | 20 | |
e5089c2c UH |
21 | /* |
22 | * Flags to control the behaviour of a genpd. | |
23 | * | |
24 | * These flags may be set in the struct generic_pm_domain's flags field by a | |
25 | * genpd backend driver. The flags must be set before it calls pm_genpd_init(), | |
26 | * which initializes a genpd. | |
27 | * | |
28 | * GENPD_FLAG_PM_CLK: Instructs genpd to use the PM clk framework, | |
29 | * while powering on/off attached devices. | |
30 | * | |
31 | * GENPD_FLAG_IRQ_SAFE: This informs genpd that its backend callbacks, | |
32 | * ->power_on|off(), doesn't sleep. Hence, these | |
33 | * can be invoked from within atomic context, which | |
34 | * enables genpd to power on/off the PM domain, | |
35 | * even when pm_runtime_is_irq_safe() returns true, | |
36 | * for any of its attached devices. Note that, a | |
37 | * genpd having this flag set, requires its | |
38 | * masterdomains to also have it set. | |
39 | * | |
40 | * GENPD_FLAG_ALWAYS_ON: Instructs genpd to always keep the PM domain | |
41 | * powered on. | |
42 | * | |
43 | * GENPD_FLAG_ACTIVE_WAKEUP: Instructs genpd to keep the PM domain powered | |
44 | * on, in case any of its attached devices is used | |
45 | * in the wakeup path to serve system wakeups. | |
eb594b73 UH |
46 | * |
47 | * GENPD_FLAG_CPU_DOMAIN: Instructs genpd that it should expect to get | |
48 | * devices attached, which may belong to CPUs or | |
49 | * possibly have subdomains with CPUs attached. | |
50 | * This flag enables the genpd backend driver to | |
51 | * deploy idle power management support for CPUs | |
52 | * and groups of CPUs. Note that, the backend | |
53 | * driver must then comply with the so called, | |
54 | * last-man-standing algorithm, for the CPUs in the | |
55 | * PM domain. | |
ed61e18a LC |
56 | * |
57 | * GENPD_FLAG_RPM_ALWAYS_ON: Instructs genpd to always keep the PM domain | |
58 | * powered on except for system suspend. | |
c79aa080 LI |
59 | * |
60 | * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its | |
61 | * components' next wakeup when determining the | |
62 | * optimal idle state. | |
e5089c2c UH |
63 | */ |
64 | #define GENPD_FLAG_PM_CLK (1U << 0) | |
65 | #define GENPD_FLAG_IRQ_SAFE (1U << 1) | |
66 | #define GENPD_FLAG_ALWAYS_ON (1U << 2) | |
67 | #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3) | |
eb594b73 | 68 | #define GENPD_FLAG_CPU_DOMAIN (1U << 4) |
ed61e18a | 69 | #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5) |
c79aa080 | 70 | #define GENPD_FLAG_MIN_RESIDENCY (1U << 6) |
c11f6f5b | 71 | |
17b75eca | 72 | enum gpd_status { |
49f618e1 UH |
73 | GENPD_STATE_ON = 0, /* PM domain is on */ |
74 | GENPD_STATE_OFF, /* PM domain is off */ | |
17b75eca | 75 | }; |
596ba34b | 76 | |
d4f81383 UH |
77 | enum genpd_notication { |
78 | GENPD_NOTIFY_PRE_OFF = 0, | |
79 | GENPD_NOTIFY_OFF, | |
80 | GENPD_NOTIFY_PRE_ON, | |
81 | GENPD_NOTIFY_ON, | |
82 | }; | |
83 | ||
f721889f RW |
84 | struct dev_power_governor { |
85 | bool (*power_down_ok)(struct dev_pm_domain *domain); | |
9df3921e | 86 | bool (*suspend_ok)(struct device *dev); |
f721889f RW |
87 | }; |
88 | ||
d5e4cbfe RW |
89 | struct gpd_dev_ops { |
90 | int (*start)(struct device *dev); | |
91 | int (*stop)(struct device *dev); | |
d5e4cbfe RW |
92 | }; |
93 | ||
fc5cbf0c AH |
94 | struct genpd_power_state { |
95 | s64 power_off_latency_ns; | |
96 | s64 power_on_latency_ns; | |
405f7226 | 97 | s64 residency_ns; |
c6a113b5 LI |
98 | u64 usage; |
99 | u64 rejected; | |
0c9b694a | 100 | struct fwnode_handle *fwnode; |
afece3ab | 101 | ktime_t idle_time; |
49a27e27 | 102 | void *data; |
fc5cbf0c AH |
103 | }; |
104 | ||
35241d12 | 105 | struct genpd_lock_ops; |
6e41766a | 106 | struct dev_pm_opp; |
1067ae3e | 107 | struct opp_table; |
35241d12 | 108 | |
f721889f | 109 | struct generic_pm_domain { |
401ea157 | 110 | struct device dev; |
f721889f | 111 | struct dev_pm_domain domain; /* PM domain operations */ |
5125bbf3 | 112 | struct list_head gpd_list_node; /* Node in the global PM domains list */ |
8d87ae48 | 113 | struct list_head parent_links; /* Links with PM domain as a parent */ |
afb0367a | 114 | struct list_head child_links; /* Links with PM domain as a child */ |
f721889f | 115 | struct list_head dev_list; /* List of devices */ |
f721889f RW |
116 | struct dev_power_governor *gov; |
117 | struct work_struct power_off_work; | |
de0aa06d JH |
118 | struct fwnode_handle *provider; /* Identity of the domain provider */ |
119 | bool has_provider; | |
d07e9c17 | 120 | const char *name; |
c4bb3160 | 121 | atomic_t sd_count; /* Number of subdomains with power "on" */ |
17b75eca | 122 | enum gpd_status status; /* Current state of the domain */ |
596ba34b RW |
123 | unsigned int device_count; /* Number of devices */ |
124 | unsigned int suspended_count; /* System suspend device counter */ | |
125 | unsigned int prepared_count; /* Suspend counter of prepared devices */ | |
42f6284a | 126 | unsigned int performance_state; /* Aggregated max performance state */ |
eb594b73 | 127 | cpumask_var_t cpus; /* A cpumask of the attached CPUs */ |
f721889f RW |
128 | int (*power_off)(struct generic_pm_domain *domain); |
129 | int (*power_on)(struct generic_pm_domain *domain); | |
d4f81383 | 130 | struct raw_notifier_head power_notifiers; /* Power on/off notifiers */ |
1067ae3e | 131 | struct opp_table *opp_table; /* OPP table of the genpd */ |
6e41766a VK |
132 | unsigned int (*opp_to_performance_state)(struct generic_pm_domain *genpd, |
133 | struct dev_pm_opp *opp); | |
42f6284a VK |
134 | int (*set_performance_state)(struct generic_pm_domain *genpd, |
135 | unsigned int state); | |
d5e4cbfe | 136 | struct gpd_dev_ops dev_ops; |
221e9b58 | 137 | s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ |
c79aa080 | 138 | ktime_t next_wakeup; /* Maintained by the domain governor */ |
6ff7bb0d RW |
139 | bool max_off_time_changed; |
140 | bool cached_power_down_ok; | |
e9499968 | 141 | bool cached_power_down_state_idx; |
c16561e8 UH |
142 | int (*attach_dev)(struct generic_pm_domain *domain, |
143 | struct device *dev); | |
144 | void (*detach_dev)(struct generic_pm_domain *domain, | |
145 | struct device *dev); | |
c11f6f5b | 146 | unsigned int flags; /* Bit field of configs for genpd */ |
59d65b73 | 147 | struct genpd_power_state *states; |
49a27e27 UH |
148 | void (*free_states)(struct genpd_power_state *states, |
149 | unsigned int state_count); | |
fc5cbf0c AH |
150 | unsigned int state_count; /* number of states */ |
151 | unsigned int state_idx; /* state that genpd will go to when off */ | |
afece3ab TG |
152 | ktime_t on_time; |
153 | ktime_t accounting_time; | |
35241d12 | 154 | const struct genpd_lock_ops *lock_ops; |
d716f479 LI |
155 | union { |
156 | struct mutex mlock; | |
157 | struct { | |
158 | spinlock_t slock; | |
159 | unsigned long lock_flags; | |
160 | }; | |
161 | }; | |
fc5cbf0c | 162 | |
f721889f RW |
163 | }; |
164 | ||
596ba34b RW |
165 | static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) |
166 | { | |
167 | return container_of(pd, struct generic_pm_domain, domain); | |
168 | } | |
169 | ||
5063ce15 | 170 | struct gpd_link { |
8d87ae48 KC |
171 | struct generic_pm_domain *parent; |
172 | struct list_head parent_node; | |
173 | struct generic_pm_domain *child; | |
174 | struct list_head child_node; | |
18edf49c VK |
175 | |
176 | /* Sub-domain's per-master domain performance state */ | |
177 | unsigned int performance_state; | |
178 | unsigned int prev_performance_state; | |
5063ce15 RW |
179 | }; |
180 | ||
b02c999a | 181 | struct gpd_timing_data { |
2b1d88cd UH |
182 | s64 suspend_latency_ns; |
183 | s64 resume_latency_ns; | |
a5bef810 | 184 | s64 effective_constraint_ns; |
6ff7bb0d | 185 | bool constraint_changed; |
9df3921e | 186 | bool cached_suspend_ok; |
b02c999a RW |
187 | }; |
188 | ||
00e7c295 UH |
189 | struct pm_domain_data { |
190 | struct list_head list_node; | |
191 | struct device *dev; | |
192 | }; | |
193 | ||
cd0ea672 RW |
194 | struct generic_pm_domain_data { |
195 | struct pm_domain_data base; | |
b02c999a | 196 | struct gpd_timing_data td; |
6ff7bb0d | 197 | struct notifier_block nb; |
d4f81383 | 198 | struct notifier_block *power_nb; |
f9ccd7c3 | 199 | int cpu; |
42f6284a | 200 | unsigned int performance_state; |
67e3242e | 201 | ktime_t next_wakeup; |
a5ea7a0f | 202 | void *data; |
cd0ea672 RW |
203 | }; |
204 | ||
9b4f617b | 205 | #ifdef CONFIG_PM_GENERIC_DOMAINS |
cd0ea672 RW |
206 | static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) |
207 | { | |
208 | return container_of(pdd, struct generic_pm_domain_data, base); | |
209 | } | |
210 | ||
d5e4cbfe RW |
211 | static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) |
212 | { | |
213 | return to_gpd_data(dev->power.subsys_data->domain_data); | |
214 | } | |
215 | ||
1a7a6707 | 216 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev); |
924f4486 | 217 | int pm_genpd_remove_device(struct device *dev); |
781b9d6b | 218 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
0d1e16c6 | 219 | struct generic_pm_domain *subdomain); |
781b9d6b | 220 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
0d1e16c6 | 221 | struct generic_pm_domain *subdomain); |
781b9d6b UH |
222 | int pm_genpd_init(struct generic_pm_domain *genpd, |
223 | struct dev_power_governor *gov, bool is_off); | |
224 | int pm_genpd_remove(struct generic_pm_domain *genpd); | |
225 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state); | |
d4f81383 UH |
226 | int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb); |
227 | int dev_pm_genpd_remove_notifier(struct device *dev); | |
67e3242e | 228 | void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next); |
b02c999a | 229 | |
ae3c511c | 230 | extern struct dev_power_governor simple_qos_governor; |
925b44a2 | 231 | extern struct dev_power_governor pm_domain_always_on_gov; |
e9499968 UH |
232 | #ifdef CONFIG_CPU_IDLE |
233 | extern struct dev_power_governor pm_domain_cpu_gov; | |
234 | #endif | |
f721889f | 235 | #else |
b02c999a | 236 | |
b642631d MD |
237 | static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) |
238 | { | |
239 | return ERR_PTR(-ENOSYS); | |
240 | } | |
1a7a6707 UH |
241 | static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, |
242 | struct device *dev) | |
b02c999a RW |
243 | { |
244 | return -ENOSYS; | |
245 | } | |
924f4486 | 246 | static inline int pm_genpd_remove_device(struct device *dev) |
f721889f RW |
247 | { |
248 | return -ENOSYS; | |
249 | } | |
250 | static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
0d1e16c6 | 251 | struct generic_pm_domain *subdomain) |
f721889f RW |
252 | { |
253 | return -ENOSYS; | |
254 | } | |
255 | static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
0d1e16c6 | 256 | struct generic_pm_domain *subdomain) |
f721889f RW |
257 | { |
258 | return -ENOSYS; | |
259 | } | |
7eb231c3 UH |
260 | static inline int pm_genpd_init(struct generic_pm_domain *genpd, |
261 | struct dev_power_governor *gov, bool is_off) | |
b02c999a | 262 | { |
7eb231c3 | 263 | return -ENOSYS; |
b02c999a | 264 | } |
3fe57710 JH |
265 | static inline int pm_genpd_remove(struct generic_pm_domain *genpd) |
266 | { | |
a94ef811 | 267 | return -EOPNOTSUPP; |
3fe57710 | 268 | } |
16d0bf18 | 269 | |
42f6284a VK |
270 | static inline int dev_pm_genpd_set_performance_state(struct device *dev, |
271 | unsigned int state) | |
272 | { | |
a94ef811 | 273 | return -EOPNOTSUPP; |
42f6284a VK |
274 | } |
275 | ||
d4f81383 UH |
276 | static inline int dev_pm_genpd_add_notifier(struct device *dev, |
277 | struct notifier_block *nb) | |
278 | { | |
a94ef811 | 279 | return -EOPNOTSUPP; |
d4f81383 UH |
280 | } |
281 | ||
282 | static inline int dev_pm_genpd_remove_notifier(struct device *dev) | |
283 | { | |
a94ef811 | 284 | return -EOPNOTSUPP; |
d4f81383 UH |
285 | } |
286 | ||
67e3242e LI |
287 | static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) |
288 | { } | |
289 | ||
16d0bf18 GU |
290 | #define simple_qos_governor (*(struct dev_power_governor *)(NULL)) |
291 | #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL)) | |
17f2ae7f RW |
292 | #endif |
293 | ||
77f827de | 294 | #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP |
fc519890 UH |
295 | void dev_pm_genpd_suspend(struct device *dev); |
296 | void dev_pm_genpd_resume(struct device *dev); | |
77f827de | 297 | #else |
fc519890 UH |
298 | static inline void dev_pm_genpd_suspend(struct device *dev) {} |
299 | static inline void dev_pm_genpd_resume(struct device *dev) {} | |
77f827de RW |
300 | #endif |
301 | ||
aa42240a TF |
302 | /* OF PM domain providers */ |
303 | struct of_device_id; | |
304 | ||
40845524 TR |
305 | typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, |
306 | void *data); | |
307 | ||
aa42240a TF |
308 | struct genpd_onecell_data { |
309 | struct generic_pm_domain **domains; | |
310 | unsigned int num_domains; | |
40845524 | 311 | genpd_xlate_t xlate; |
aa42240a TF |
312 | }; |
313 | ||
aa42240a | 314 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc JH |
315 | int of_genpd_add_provider_simple(struct device_node *np, |
316 | struct generic_pm_domain *genpd); | |
317 | int of_genpd_add_provider_onecell(struct device_node *np, | |
318 | struct genpd_onecell_data *data); | |
aa42240a | 319 | void of_genpd_del_provider(struct device_node *np); |
781b9d6b | 320 | int of_genpd_add_device(struct of_phandle_args *args, struct device *dev); |
0d1e16c6 UH |
321 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, |
322 | struct of_phandle_args *subdomain_spec); | |
dedd1492 UH |
323 | int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, |
324 | struct of_phandle_args *subdomain_spec); | |
781b9d6b UH |
325 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np); |
326 | int of_genpd_parse_idle_states(struct device_node *dn, | |
327 | struct genpd_power_state **states, int *n); | |
e38f89d3 VK |
328 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, |
329 | struct dev_pm_opp *opp); | |
aa42240a TF |
330 | |
331 | int genpd_dev_pm_attach(struct device *dev); | |
3c095f32 UH |
332 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, |
333 | unsigned int index); | |
5d6be70a | 334 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, |
7416f1f2 | 335 | const char *name); |
aa42240a | 336 | #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */ |
892ebdcc JH |
337 | static inline int of_genpd_add_provider_simple(struct device_node *np, |
338 | struct generic_pm_domain *genpd) | |
aa42240a | 339 | { |
a94ef811 | 340 | return -EOPNOTSUPP; |
892ebdcc JH |
341 | } |
342 | ||
343 | static inline int of_genpd_add_provider_onecell(struct device_node *np, | |
344 | struct genpd_onecell_data *data) | |
345 | { | |
a94ef811 | 346 | return -EOPNOTSUPP; |
aa42240a | 347 | } |
aa42240a | 348 | |
892ebdcc | 349 | static inline void of_genpd_del_provider(struct device_node *np) {} |
aa42240a | 350 | |
ec69572b JH |
351 | static inline int of_genpd_add_device(struct of_phandle_args *args, |
352 | struct device *dev) | |
353 | { | |
354 | return -ENODEV; | |
355 | } | |
356 | ||
0d1e16c6 UH |
357 | static inline int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, |
358 | struct of_phandle_args *subdomain_spec) | |
ec69572b JH |
359 | { |
360 | return -ENODEV; | |
361 | } | |
362 | ||
dedd1492 UH |
363 | static inline int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, |
364 | struct of_phandle_args *subdomain_spec) | |
365 | { | |
366 | return -ENODEV; | |
367 | } | |
368 | ||
30f60428 LI |
369 | static inline int of_genpd_parse_idle_states(struct device_node *dn, |
370 | struct genpd_power_state **states, int *n) | |
371 | { | |
372 | return -ENODEV; | |
373 | } | |
374 | ||
e38f89d3 VK |
375 | static inline unsigned int |
376 | pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
377 | struct dev_pm_opp *opp) | |
378 | { | |
379 | return 0; | |
380 | } | |
381 | ||
aa42240a TF |
382 | static inline int genpd_dev_pm_attach(struct device *dev) |
383 | { | |
919b7308 | 384 | return 0; |
aa42240a | 385 | } |
17926551 | 386 | |
3c095f32 UH |
387 | static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev, |
388 | unsigned int index) | |
389 | { | |
390 | return NULL; | |
391 | } | |
392 | ||
5d6be70a | 393 | static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev, |
7416f1f2 | 394 | const char *name) |
5d6be70a UH |
395 | { |
396 | return NULL; | |
397 | } | |
398 | ||
17926551 JH |
399 | static inline |
400 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
401 | { | |
a94ef811 | 402 | return ERR_PTR(-EOPNOTSUPP); |
17926551 | 403 | } |
aa42240a TF |
404 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
405 | ||
f48c767c | 406 | #ifdef CONFIG_PM |
781b9d6b | 407 | int dev_pm_domain_attach(struct device *dev, bool power_on); |
82e12d9e UH |
408 | struct device *dev_pm_domain_attach_by_id(struct device *dev, |
409 | unsigned int index); | |
27dceb81 | 410 | struct device *dev_pm_domain_attach_by_name(struct device *dev, |
eeb35df0 | 411 | const char *name); |
781b9d6b | 412 | void dev_pm_domain_detach(struct device *dev, bool power_off); |
ca765a8c | 413 | int dev_pm_domain_start(struct device *dev); |
781b9d6b | 414 | void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd); |
f48c767c UH |
415 | #else |
416 | static inline int dev_pm_domain_attach(struct device *dev, bool power_on) | |
417 | { | |
919b7308 | 418 | return 0; |
f48c767c | 419 | } |
82e12d9e UH |
420 | static inline struct device *dev_pm_domain_attach_by_id(struct device *dev, |
421 | unsigned int index) | |
422 | { | |
423 | return NULL; | |
424 | } | |
27dceb81 | 425 | static inline struct device *dev_pm_domain_attach_by_name(struct device *dev, |
eeb35df0 | 426 | const char *name) |
27dceb81 UH |
427 | { |
428 | return NULL; | |
429 | } | |
f48c767c | 430 | static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {} |
ca765a8c UH |
431 | static inline int dev_pm_domain_start(struct device *dev) |
432 | { | |
433 | return 0; | |
434 | } | |
989561de TV |
435 | static inline void dev_pm_domain_set(struct device *dev, |
436 | struct dev_pm_domain *pd) {} | |
f48c767c UH |
437 | #endif |
438 | ||
f721889f | 439 | #endif /* _LINUX_PM_DOMAIN_H */ |