1 /*
2 * Copyright (c) 2018 Intel Corporation.
3 * Copyright (c) 2021 Nordic Semiconductor ASA
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
8 #include <zephyr/pm/state.h>
9 #include <zephyr/toolchain.h>
10
11 BUILD_ASSERT(DT_NODE_EXISTS(DT_PATH(cpus)),
12 "cpus node not defined in Devicetree");
13
14 /**
15 * Check CPU power state consistency.
16 *
17 * @param i Power state index.
18 * @param node_id CPU node identifier.
19 */
20 #define CHECK_POWER_STATE_CONSISTENCY(i, node_id) \
21 BUILD_ASSERT( \
22 DT_PROP_BY_PHANDLE_IDX_OR(node_id, cpu_power_states, i, \
23 min_residency_us, 0U) >= \
24 DT_PROP_BY_PHANDLE_IDX_OR(node_id, cpu_power_states, i, \
25 exit_latency_us, 0U), \
26 "Found CPU power state with min_residency < exit_latency")
27
28 /**
29 * @brief Check CPU power states consistency
30 *
31 * All states should have a minimum residency >= than the exit latency.
32 *
33 * @param node_id A CPU node identifier.
34 */
35 #define CHECK_POWER_STATES_CONSISTENCY(node_id) \
36 LISTIFY(DT_PROP_LEN_OR(node_id, cpu_power_states, 0), \
37 CHECK_POWER_STATE_CONSISTENCY, (;), node_id); \
38
39 /* Check that all power states are consistent */
40 DT_FOREACH_CHILD(DT_PATH(cpus), CHECK_POWER_STATES_CONSISTENCY)
41
42 #define DEFINE_CPU_STATES(n) \
43 static const struct pm_state_info pmstates_##n[] \
44 = PM_STATE_INFO_LIST_FROM_DT_CPU(n);
45 #define CPU_STATE_REF(n) pmstates_##n
46
47 DT_FOREACH_CHILD(DT_PATH(cpus), DEFINE_CPU_STATES);
48
49 /** CPU power states information for each CPU */
50 static const struct pm_state_info *cpus_states[] = {
51 DT_FOREACH_CHILD_STATUS_OKAY_SEP(DT_PATH(cpus), CPU_STATE_REF, (,))
52 };
53
54 /** Number of states for each CPU */
55 static const uint8_t states_per_cpu[] = {
56 DT_FOREACH_CHILD_STATUS_OKAY_SEP(DT_PATH(cpus), DT_NUM_CPU_POWER_STATES, (,))
57 };
58
pm_state_cpu_get_all(uint8_t cpu,const struct pm_state_info ** states)59 uint8_t pm_state_cpu_get_all(uint8_t cpu, const struct pm_state_info **states)
60 {
61 if (cpu >= ARRAY_SIZE(cpus_states)) {
62 return 0;
63 }
64
65 *states = cpus_states[cpu];
66
67 return states_per_cpu[cpu];
68 }
69
