1 /*
2 * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <plat_arm.h>
9 #include <plat_private.h>
10 #include <pm_common.h>
11 #include <common/debug.h>
12 #include <lib/mmio.h>
13 #include <lib/psci/psci.h>
14 #include <plat/common/platform.h>
15 #include <plat/arm/common/plat_arm.h>
16
17 #include "pm_api_sys.h"
18 #include "pm_client.h"
19
20 static uintptr_t versal_sec_entry;
21
versal_pwr_domain_on(u_register_t mpidr)22 static int versal_pwr_domain_on(u_register_t mpidr)
23 {
24 unsigned int cpu_id = plat_core_pos_by_mpidr(mpidr);
25 const struct pm_proc *proc;
26
27 VERBOSE("%s: mpidr: 0x%lx\n", __func__, mpidr);
28
29 if (cpu_id == -1)
30 return PSCI_E_INTERN_FAIL;
31
32 proc = pm_get_proc(cpu_id);
33
34 /* Send request to PMC to wake up selected ACPU core */
35 pm_req_wakeup(proc->node_id, (versal_sec_entry & 0xFFFFFFFF) | 0x1,
36 versal_sec_entry >> 32, 0, SECURE_FLAG);
37
38 /* Clear power down request */
39 pm_client_wakeup(proc);
40
41 return PSCI_E_SUCCESS;
42 }
43
44 /**
45 * versal_pwr_domain_suspend() - This function sends request to PMC to suspend
46 * core.
47 *
48 * @target_state Targated state
49 */
versal_pwr_domain_suspend(const psci_power_state_t * target_state)50 static void versal_pwr_domain_suspend(const psci_power_state_t *target_state)
51 {
52 unsigned int state;
53 unsigned int cpu_id = plat_my_core_pos();
54 const struct pm_proc *proc = pm_get_proc(cpu_id);
55
56 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++)
57 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n",
58 __func__, i, target_state->pwr_domain_state[i]);
59
60 plat_versal_gic_cpuif_disable();
61
62 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) {
63 plat_versal_gic_save();
64 }
65
66 state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ?
67 PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE;
68
69 /* Send request to PMC to suspend this core */
70 pm_self_suspend(proc->node_id, MAX_LATENCY, state, versal_sec_entry,
71 SECURE_FLAG);
72
73 /* APU is to be turned off */
74 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) {
75 /* disable coherency */
76 plat_arm_interconnect_exit_coherency();
77 }
78 }
79
80 /**
81 * versal_pwr_domain_suspend_finish() - This function performs actions to finish
82 * suspend procedure.
83 *
84 * @target_state Targated state
85 */
versal_pwr_domain_suspend_finish(const psci_power_state_t * target_state)86 static void versal_pwr_domain_suspend_finish(
87 const psci_power_state_t *target_state)
88 {
89 unsigned int cpu_id = plat_my_core_pos();
90 const struct pm_proc *proc = pm_get_proc(cpu_id);
91
92 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++)
93 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n",
94 __func__, i, target_state->pwr_domain_state[i]);
95
96 /* Clear the APU power control register for this cpu */
97 pm_client_wakeup(proc);
98
99 /* enable coherency */
100 plat_arm_interconnect_enter_coherency();
101
102 /* APU was turned off, so restore GIC context */
103 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) {
104 plat_versal_gic_resume();
105 }
106
107 plat_versal_gic_cpuif_enable();
108 }
109
versal_pwr_domain_on_finish(const psci_power_state_t * target_state)110 void versal_pwr_domain_on_finish(const psci_power_state_t *target_state)
111 {
112 /* Enable the gic cpu interface */
113 plat_versal_gic_pcpu_init();
114
115 /* Program the gic per-cpu distributor or re-distributor interface */
116 plat_versal_gic_cpuif_enable();
117 }
118
119 /**
120 * versal_system_off() - This function sends the system off request
121 * to firmware. This function does not return.
122 */
versal_system_off(void)123 static void __dead2 versal_system_off(void)
124 {
125 /* Send the power down request to the PMC */
126 pm_system_shutdown(XPM_SHUTDOWN_TYPE_SHUTDOWN,
127 pm_get_shutdown_scope(), SECURE_FLAG);
128
129 while (1)
130 wfi();
131 }
132
133 /**
134 * versal_system_reset() - This function sends the reset request
135 * to firmware for the system to reset. This function does not return.
136 */
versal_system_reset(void)137 static void __dead2 versal_system_reset(void)
138 {
139 /* Send the system reset request to the PMC */
140 pm_system_shutdown(XPM_SHUTDOWN_TYPE_RESET,
141 pm_get_shutdown_scope(), SECURE_FLAG);
142
143 while (1)
144 wfi();
145 }
146
147 /**
148 * versal_pwr_domain_off() - This function performs actions to turn off core
149 *
150 * @target_state Targated state
151 */
versal_pwr_domain_off(const psci_power_state_t * target_state)152 static void versal_pwr_domain_off(const psci_power_state_t *target_state)
153 {
154 unsigned int cpu_id = plat_my_core_pos();
155 const struct pm_proc *proc = pm_get_proc(cpu_id);
156
157 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++)
158 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n",
159 __func__, i, target_state->pwr_domain_state[i]);
160
161 /* Prevent interrupts from spuriously waking up this cpu */
162 plat_versal_gic_cpuif_disable();
163
164 /*
165 * Send request to PMC to power down the appropriate APU CPU
166 * core.
167 * According to PSCI specification, CPU_off function does not
168 * have resume address and CPU core can only be woken up
169 * invoking CPU_on function, during which resume address will
170 * be set.
171 */
172 pm_self_suspend(proc->node_id, MAX_LATENCY, PM_STATE_CPU_IDLE, 0,
173 SECURE_FLAG);
174 }
175
176 /**
177 * versal_validate_power_state() - This function ensures that the power state
178 * parameter in request is valid.
179 *
180 * @power_state Power state of core
181 * @req_state Requested state
182 *
183 * @return Returns status, either success or reason
184 */
versal_validate_power_state(unsigned int power_state,psci_power_state_t * req_state)185 static int versal_validate_power_state(unsigned int power_state,
186 psci_power_state_t *req_state)
187 {
188 VERBOSE("%s: power_state: 0x%x\n", __func__, power_state);
189
190 int pstate = psci_get_pstate_type(power_state);
191
192 assert(req_state);
193
194 /* Sanity check the requested state */
195 if (pstate == PSTATE_TYPE_STANDBY)
196 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_RET_STATE;
197 else
198 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE;
199
200 /* We expect the 'state id' to be zero */
201 if (psci_get_pstate_id(power_state))
202 return PSCI_E_INVALID_PARAMS;
203
204 return PSCI_E_SUCCESS;
205 }
206
207 /**
208 * versal_get_sys_suspend_power_state() - Get power state for system suspend
209 *
210 * @req_state Requested state
211 */
versal_get_sys_suspend_power_state(psci_power_state_t * req_state)212 static void versal_get_sys_suspend_power_state(psci_power_state_t *req_state)
213 {
214 req_state->pwr_domain_state[PSCI_CPU_PWR_LVL] = PLAT_MAX_OFF_STATE;
215 req_state->pwr_domain_state[1] = PLAT_MAX_OFF_STATE;
216 }
217
218 static const struct plat_psci_ops versal_nopmc_psci_ops = {
219 .pwr_domain_on = versal_pwr_domain_on,
220 .pwr_domain_off = versal_pwr_domain_off,
221 .pwr_domain_on_finish = versal_pwr_domain_on_finish,
222 .pwr_domain_suspend = versal_pwr_domain_suspend,
223 .pwr_domain_suspend_finish = versal_pwr_domain_suspend_finish,
224 .system_off = versal_system_off,
225 .system_reset = versal_system_reset,
226 .validate_power_state = versal_validate_power_state,
227 .get_sys_suspend_power_state = versal_get_sys_suspend_power_state,
228 };
229
230 /*******************************************************************************
231 * Export the platform specific power ops.
232 ******************************************************************************/
plat_setup_psci_ops(uintptr_t sec_entrypoint,const struct plat_psci_ops ** psci_ops)233 int plat_setup_psci_ops(uintptr_t sec_entrypoint,
234 const struct plat_psci_ops **psci_ops)
235 {
236 versal_sec_entry = sec_entrypoint;
237
238 *psci_ops = &versal_nopmc_psci_ops;
239
240 return 0;
241 }
242