blob: cbf994a4713f0ff10a6b33b4c892520c245ab905 [file] [log] [blame]
Soby Mathew61e8d0b2015-10-12 17:32:29 +01001/*
2 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30#include <css_pm.h>
31#include <plat_arm.h>
32
33/*
34 * Custom `validate_power_state` handler for Juno. According to PSCI
35 * Specification, interrupts targeted to cores in PSCI CPU SUSPEND should
36 * be able to resume it. On Juno, when the system power domain is suspended,
37 * the GIC is also powered down. The SCP resumes the final core to be suspend
38 * when an external wake-up event is received. But the other cores cannot be
39 * woken up by a targeted interrupt, because GIC doesn't forward these
40 * interrupts to the SCP. Due to this hardware limitation, we down-grade PSCI
41 * CPU SUSPEND requests targeted to the system power domain level
42 * to cluster power domain level.
43 *
44 * The system power domain suspend on Juno is only supported only via
45 * PSCI SYSTEM SUSPEND API.
46 */
47static int juno_validate_power_state(unsigned int power_state,
48 psci_power_state_t *req_state)
49{
50 int rc;
51 rc = arm_validate_power_state(power_state, req_state);
52
53 /*
54 * Ensure that the system power domain level is never suspended
55 * via PSCI CPU SUSPEND API. Currently system suspend is only
56 * supported via PSCI SYSTEM SUSPEND API.
57 */
58 req_state->pwr_domain_state[ARM_PWR_LVL2] = ARM_LOCAL_STATE_RUN;
59 return rc;
60}
61
Soby Mathew421dbc42016-05-23 16:07:53 +010062/*
63 * Custom `translate_power_state_by_mpidr` handler for Juno. Unlike in the
64 * `juno_validate_power_state`, we do not down-grade the system power
65 * domain level request in `power_state` as it will be used to query the
66 * PSCI_STAT_COUNT/RESIDENCY at the system power domain level.
67 */
68static int juno_translate_power_state_by_mpidr(u_register_t mpidr,
69 unsigned int power_state,
70 psci_power_state_t *output_state)
71{
72 return arm_validate_power_state(power_state, output_state);
73}
74
Soby Mathew61e8d0b2015-10-12 17:32:29 +010075/*******************************************************************************
76 * Export the platform handlers via plat_arm_psci_pm_ops. The ARM Standard
77 * platform will take care of registering the handlers with PSCI.
78 ******************************************************************************/
79const plat_psci_ops_t plat_arm_psci_pm_ops = {
80 .pwr_domain_on = css_pwr_domain_on,
81 .pwr_domain_on_finish = css_pwr_domain_on_finish,
82 .pwr_domain_off = css_pwr_domain_off,
83 .cpu_standby = css_cpu_standby,
84 .pwr_domain_suspend = css_pwr_domain_suspend,
85 .pwr_domain_suspend_finish = css_pwr_domain_suspend_finish,
86 .system_off = css_system_off,
87 .system_reset = css_system_reset,
88 .validate_power_state = juno_validate_power_state,
89 .validate_ns_entrypoint = arm_validate_ns_entrypoint,
Soby Mathew421dbc42016-05-23 16:07:53 +010090 .get_sys_suspend_power_state = css_get_sys_suspend_power_state,
91 .translate_power_state_by_mpidr = juno_translate_power_state_by_mpidr
Soby Mathew61e8d0b2015-10-12 17:32:29 +010092};