1 /*
2 * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <platform_def.h>
9
10 #include <arch_helpers.h>
11 #include <common/debug.h>
12 #include <lib/psci/psci.h>
13 #include <lib/semihosting.h>
14 #include <plat/common/platform.h>
15 #include <drivers/gpio.h>
16
17 #include "qemu_private.h"
18
19 #define ADP_STOPPED_APPLICATION_EXIT 0x20026
20
21 /*
22 * The secure entry point to be used on warm reset.
23 */
24 static unsigned long secure_entrypoint;
25
26 /* Make composite power state parameter till power level 0 */
27 #if PSCI_EXTENDED_STATE_ID
28
29 #define qemu_make_pwrstate_lvl0(lvl0_state, pwr_lvl, type) \
30 (((lvl0_state) << PSTATE_ID_SHIFT) | \
31 ((type) << PSTATE_TYPE_SHIFT))
32 #else
33 #define qemu_make_pwrstate_lvl0(lvl0_state, pwr_lvl, type) \
34 (((lvl0_state) << PSTATE_ID_SHIFT) | \
35 ((pwr_lvl) << PSTATE_PWR_LVL_SHIFT) | \
36 ((type) << PSTATE_TYPE_SHIFT))
37 #endif /* PSCI_EXTENDED_STATE_ID */
38
39
40 #define qemu_make_pwrstate_lvl1(lvl1_state, lvl0_state, pwr_lvl, type) \
41 (((lvl1_state) << PLAT_LOCAL_PSTATE_WIDTH) | \
42 qemu_make_pwrstate_lvl0(lvl0_state, pwr_lvl, type))
43
44
45
46 /*
47 * The table storing the valid idle power states. Ensure that the
48 * array entries are populated in ascending order of state-id to
49 * enable us to use binary search during power state validation.
50 * The table must be terminated by a NULL entry.
51 */
52 static const unsigned int qemu_pm_idle_states[] = {
53 /* State-id - 0x01 */
54 qemu_make_pwrstate_lvl1(PLAT_LOCAL_STATE_RUN, PLAT_LOCAL_STATE_RET,
55 MPIDR_AFFLVL0, PSTATE_TYPE_STANDBY),
56 /* State-id - 0x02 */
57 qemu_make_pwrstate_lvl1(PLAT_LOCAL_STATE_RUN, PLAT_LOCAL_STATE_OFF,
58 MPIDR_AFFLVL0, PSTATE_TYPE_POWERDOWN),
59 /* State-id - 0x22 */
60 qemu_make_pwrstate_lvl1(PLAT_LOCAL_STATE_OFF, PLAT_LOCAL_STATE_OFF,
61 MPIDR_AFFLVL1, PSTATE_TYPE_POWERDOWN),
62 0,
63 };
64
65 /*******************************************************************************
66 * Platform handler called to check the validity of the power state
67 * parameter. The power state parameter has to be a composite power state.
68 ******************************************************************************/
qemu_validate_power_state(unsigned int power_state,psci_power_state_t * req_state)69 static int qemu_validate_power_state(unsigned int power_state,
70 psci_power_state_t *req_state)
71 {
72 unsigned int state_id;
73 int i;
74
75 assert(req_state);
76
77 /*
78 * Currently we are using a linear search for finding the matching
79 * entry in the idle power state array. This can be made a binary
80 * search if the number of entries justify the additional complexity.
81 */
82 for (i = 0; !!qemu_pm_idle_states[i]; i++) {
83 if (power_state == qemu_pm_idle_states[i])
84 break;
85 }
86
87 /* Return error if entry not found in the idle state array */
88 if (!qemu_pm_idle_states[i])
89 return PSCI_E_INVALID_PARAMS;
90
91 i = 0;
92 state_id = psci_get_pstate_id(power_state);
93
94 /* Parse the State ID and populate the state info parameter */
95 while (state_id) {
96 req_state->pwr_domain_state[i++] = state_id &
97 PLAT_LOCAL_PSTATE_MASK;
98 state_id >>= PLAT_LOCAL_PSTATE_WIDTH;
99 }
100
101 return PSCI_E_SUCCESS;
102 }
103
104 /*******************************************************************************
105 * Platform handler called when a CPU is about to enter standby.
106 ******************************************************************************/
qemu_cpu_standby(plat_local_state_t cpu_state)107 static void qemu_cpu_standby(plat_local_state_t cpu_state)
108 {
109
110 assert(cpu_state == PLAT_LOCAL_STATE_RET);
111
112 /*
113 * Enter standby state
114 * dsb is good practice before using wfi to enter low power states
115 */
116 dsb();
117 wfi();
118 }
119
120 /*******************************************************************************
121 * Platform handler called when a power domain is about to be turned on. The
122 * mpidr determines the CPU to be turned on.
123 ******************************************************************************/
qemu_pwr_domain_on(u_register_t mpidr)124 static int qemu_pwr_domain_on(u_register_t mpidr)
125 {
126 int rc = PSCI_E_SUCCESS;
127 unsigned pos = plat_core_pos_by_mpidr(mpidr);
128 uint64_t *hold_base = (uint64_t *)PLAT_QEMU_HOLD_BASE;
129
130 hold_base[pos] = PLAT_QEMU_HOLD_STATE_GO;
131 sev();
132
133 return rc;
134 }
135
136 /*******************************************************************************
137 * Platform handler called when a power domain is about to be turned off. The
138 * target_state encodes the power state that each level should transition to.
139 ******************************************************************************/
qemu_pwr_domain_off(const psci_power_state_t * target_state)140 static void qemu_pwr_domain_off(const psci_power_state_t *target_state)
141 {
142 qemu_pwr_gic_off();
143 }
144
145 void __dead2 plat_secondary_cold_boot_setup(void);
146
147 static void __dead2
qemu_pwr_domain_pwr_down_wfi(const psci_power_state_t * target_state)148 qemu_pwr_domain_pwr_down_wfi(const psci_power_state_t *target_state)
149 {
150 disable_mmu_el3();
151 plat_secondary_cold_boot_setup();
152 }
153
154 /*******************************************************************************
155 * Platform handler called when a power domain is about to be suspended. The
156 * target_state encodes the power state that each level should transition to.
157 ******************************************************************************/
qemu_pwr_domain_suspend(const psci_power_state_t * target_state)158 void qemu_pwr_domain_suspend(const psci_power_state_t *target_state)
159 {
160 assert(0);
161 }
162
163 /*******************************************************************************
164 * Platform handler called when a power domain has just been powered on after
165 * being turned off earlier. The target_state encodes the low power state that
166 * each level has woken up from.
167 ******************************************************************************/
qemu_pwr_domain_on_finish(const psci_power_state_t * target_state)168 void qemu_pwr_domain_on_finish(const psci_power_state_t *target_state)
169 {
170 assert(target_state->pwr_domain_state[MPIDR_AFFLVL0] ==
171 PLAT_LOCAL_STATE_OFF);
172
173 qemu_pwr_gic_on_finish();
174 }
175
176 /*******************************************************************************
177 * Platform handler called when a power domain has just been powered on after
178 * having been suspended earlier. The target_state encodes the low power state
179 * that each level has woken up from.
180 ******************************************************************************/
qemu_pwr_domain_suspend_finish(const psci_power_state_t * target_state)181 void qemu_pwr_domain_suspend_finish(const psci_power_state_t *target_state)
182 {
183 assert(0);
184 }
185
186 /*******************************************************************************
187 * Platform handlers to shutdown/reboot the system
188 ******************************************************************************/
189
qemu_system_off(void)190 static void __dead2 qemu_system_off(void)
191 {
192 #ifdef SECURE_GPIO_BASE
193 ERROR("QEMU System Power off: with GPIO.\n");
194 gpio_set_direction(SECURE_GPIO_POWEROFF, GPIO_DIR_OUT);
195 gpio_set_value(SECURE_GPIO_POWEROFF, GPIO_LEVEL_LOW);
196 gpio_set_value(SECURE_GPIO_POWEROFF, GPIO_LEVEL_HIGH);
197 #else
198 semihosting_exit(ADP_STOPPED_APPLICATION_EXIT, 0);
199 ERROR("QEMU System Off: semihosting call unexpectedly returned.\n");
200 #endif
201 panic();
202 }
203
qemu_system_reset(void)204 static void __dead2 qemu_system_reset(void)
205 {
206 ERROR("QEMU System Reset: with GPIO.\n");
207 #ifdef SECURE_GPIO_BASE
208 gpio_set_direction(SECURE_GPIO_RESET, GPIO_DIR_OUT);
209 gpio_set_value(SECURE_GPIO_RESET, GPIO_LEVEL_LOW);
210 gpio_set_value(SECURE_GPIO_RESET, GPIO_LEVEL_HIGH);
211 #else
212 ERROR("QEMU System Reset: operation not handled.\n");
213 #endif
214 panic();
215 }
216
217 static const plat_psci_ops_t plat_qemu_psci_pm_ops = {
218 .cpu_standby = qemu_cpu_standby,
219 .pwr_domain_on = qemu_pwr_domain_on,
220 .pwr_domain_off = qemu_pwr_domain_off,
221 .pwr_domain_pwr_down_wfi = qemu_pwr_domain_pwr_down_wfi,
222 .pwr_domain_suspend = qemu_pwr_domain_suspend,
223 .pwr_domain_on_finish = qemu_pwr_domain_on_finish,
224 .pwr_domain_suspend_finish = qemu_pwr_domain_suspend_finish,
225 .system_off = qemu_system_off,
226 .system_reset = qemu_system_reset,
227 .validate_power_state = qemu_validate_power_state,
228 };
229
plat_setup_psci_ops(uintptr_t sec_entrypoint,const plat_psci_ops_t ** psci_ops)230 int plat_setup_psci_ops(uintptr_t sec_entrypoint,
231 const plat_psci_ops_t **psci_ops)
232 {
233 uintptr_t *mailbox = (void *) PLAT_QEMU_TRUSTED_MAILBOX_BASE;
234
235 *mailbox = sec_entrypoint;
236 secure_entrypoint = (unsigned long) sec_entrypoint;
237 *psci_ops = &plat_qemu_psci_pm_ops;
238
239 return 0;
240 }
241