1 /*
2 * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <stdbool.h>
9
10 #include <arch_helpers.h>
11 #include <common/debug.h>
12 #include <lib/el3_runtime/cpu_data.h>
13 #include <lib/psci/psci.h>
14 #include <plat/common/platform.h>
15
16 #include <ti_sci_protocol.h>
17 #include <k3_gicv3.h>
18 #include <ti_sci.h>
19
20 #define CORE_PWR_STATE(state) ((state)->pwr_domain_state[MPIDR_AFFLVL0])
21 #define CLUSTER_PWR_STATE(state) ((state)->pwr_domain_state[MPIDR_AFFLVL1])
22 #define SYSTEM_PWR_STATE(state) ((state)->pwr_domain_state[PLAT_MAX_PWR_LVL])
23
24 uintptr_t k3_sec_entrypoint;
25
k3_cpu_standby(plat_local_state_t cpu_state)26 static void k3_cpu_standby(plat_local_state_t cpu_state)
27 {
28 u_register_t scr;
29
30 scr = read_scr_el3();
31 /* Enable the Non secure interrupt to wake the CPU */
32 write_scr_el3(scr | SCR_IRQ_BIT | SCR_FIQ_BIT);
33 isb();
34 /* dsb is good practice before using wfi to enter low power states */
35 dsb();
36 /* Enter standby state */
37 wfi();
38 /* Restore SCR */
39 write_scr_el3(scr);
40 }
41
k3_pwr_domain_on(u_register_t mpidr)42 static int k3_pwr_domain_on(u_register_t mpidr)
43 {
44 int core, proc_id, device_id, ret;
45
46 core = plat_core_pos_by_mpidr(mpidr);
47 if (core < 0) {
48 ERROR("Could not get target core id: %d\n", core);
49 return PSCI_E_INTERN_FAIL;
50 }
51
52 proc_id = PLAT_PROC_START_ID + core;
53 device_id = PLAT_PROC_DEVICE_START_ID + core;
54
55 ret = ti_sci_proc_request(proc_id);
56 if (ret) {
57 ERROR("Request for processor failed: %d\n", ret);
58 return PSCI_E_INTERN_FAIL;
59 }
60
61 ret = ti_sci_proc_set_boot_cfg(proc_id, k3_sec_entrypoint, 0, 0);
62 if (ret) {
63 ERROR("Request to set core boot address failed: %d\n", ret);
64 return PSCI_E_INTERN_FAIL;
65 }
66
67 /* sanity check these are off before starting a core */
68 ret = ti_sci_proc_set_boot_ctrl(proc_id,
69 0, PROC_BOOT_CTRL_FLAG_ARMV8_L2FLUSHREQ |
70 PROC_BOOT_CTRL_FLAG_ARMV8_AINACTS |
71 PROC_BOOT_CTRL_FLAG_ARMV8_ACINACTM);
72 if (ret) {
73 ERROR("Request to clear boot configuration failed: %d\n", ret);
74 return PSCI_E_INTERN_FAIL;
75 }
76
77 ret = ti_sci_device_get(device_id);
78 if (ret) {
79 ERROR("Request to start core failed: %d\n", ret);
80 return PSCI_E_INTERN_FAIL;
81 }
82
83 return PSCI_E_SUCCESS;
84 }
85
k3_pwr_domain_off(const psci_power_state_t * target_state)86 void k3_pwr_domain_off(const psci_power_state_t *target_state)
87 {
88 int core, cluster, proc_id, device_id, cluster_id, ret;
89
90 /* At very least the local core should be powering down */
91 assert(CORE_PWR_STATE(target_state) == PLAT_MAX_OFF_STATE);
92
93 /* Prevent interrupts from spuriously waking up this cpu */
94 k3_gic_cpuif_disable();
95
96 core = plat_my_core_pos();
97 cluster = MPIDR_AFFLVL1_VAL(read_mpidr_el1());
98 proc_id = PLAT_PROC_START_ID + core;
99 device_id = PLAT_PROC_DEVICE_START_ID + core;
100 cluster_id = PLAT_CLUSTER_DEVICE_START_ID + (cluster * 2);
101
102 /*
103 * If we are the last core in the cluster then we take a reference to
104 * the cluster device so that it does not get shutdown before we
105 * execute the entire cluster L2 cleaning sequence below.
106 */
107 if (CLUSTER_PWR_STATE(target_state) == PLAT_MAX_OFF_STATE) {
108 ret = ti_sci_device_get(cluster_id);
109 if (ret) {
110 ERROR("Request to get cluster failed: %d\n", ret);
111 return;
112 }
113 }
114
115 /* Start by sending wait for WFI command */
116 ret = ti_sci_proc_wait_boot_status_no_wait(proc_id,
117 /*
118 * Wait maximum time to give us the best chance to get
119 * to WFI before this command timeouts
120 */
121 UINT8_MAX, 100, UINT8_MAX, UINT8_MAX,
122 /* Wait for WFI */
123 PROC_BOOT_STATUS_FLAG_ARMV8_WFI, 0, 0, 0);
124 if (ret) {
125 ERROR("Sending wait for WFI failed (%d)\n", ret);
126 return;
127 }
128
129 /* Now queue up the core shutdown request */
130 ret = ti_sci_device_put_no_wait(device_id);
131 if (ret) {
132 ERROR("Sending core shutdown message failed (%d)\n", ret);
133 return;
134 }
135
136 /* If our cluster is not going down we stop here */
137 if (CLUSTER_PWR_STATE(target_state) != PLAT_MAX_OFF_STATE)
138 return;
139
140 /* set AINACTS */
141 ret = ti_sci_proc_set_boot_ctrl_no_wait(proc_id,
142 PROC_BOOT_CTRL_FLAG_ARMV8_AINACTS, 0);
143 if (ret) {
144 ERROR("Sending set control message failed (%d)\n", ret);
145 return;
146 }
147
148 /* set L2FLUSHREQ */
149 ret = ti_sci_proc_set_boot_ctrl_no_wait(proc_id,
150 PROC_BOOT_CTRL_FLAG_ARMV8_L2FLUSHREQ, 0);
151 if (ret) {
152 ERROR("Sending set control message failed (%d)\n", ret);
153 return;
154 }
155
156 /* wait for L2FLUSHDONE*/
157 ret = ti_sci_proc_wait_boot_status_no_wait(proc_id,
158 UINT8_MAX, 2, UINT8_MAX, UINT8_MAX,
159 PROC_BOOT_STATUS_FLAG_ARMV8_L2F_DONE, 0, 0, 0);
160 if (ret) {
161 ERROR("Sending wait message failed (%d)\n", ret);
162 return;
163 }
164
165 /* clear L2FLUSHREQ */
166 ret = ti_sci_proc_set_boot_ctrl_no_wait(proc_id,
167 0, PROC_BOOT_CTRL_FLAG_ARMV8_L2FLUSHREQ);
168 if (ret) {
169 ERROR("Sending set control message failed (%d)\n", ret);
170 return;
171 }
172
173 /* set ACINACTM */
174 ret = ti_sci_proc_set_boot_ctrl_no_wait(proc_id,
175 PROC_BOOT_CTRL_FLAG_ARMV8_ACINACTM, 0);
176 if (ret) {
177 ERROR("Sending set control message failed (%d)\n", ret);
178 return;
179 }
180
181 /* wait for STANDBYWFIL2 */
182 ret = ti_sci_proc_wait_boot_status_no_wait(proc_id,
183 UINT8_MAX, 2, UINT8_MAX, UINT8_MAX,
184 PROC_BOOT_STATUS_FLAG_ARMV8_STANDBYWFIL2, 0, 0, 0);
185 if (ret) {
186 ERROR("Sending wait message failed (%d)\n", ret);
187 return;
188 }
189
190 /* Now queue up the cluster shutdown request */
191 ret = ti_sci_device_put_no_wait(cluster_id);
192 if (ret) {
193 ERROR("Sending cluster shutdown message failed (%d)\n", ret);
194 return;
195 }
196 }
197
k3_pwr_domain_on_finish(const psci_power_state_t * target_state)198 void k3_pwr_domain_on_finish(const psci_power_state_t *target_state)
199 {
200 /* TODO: Indicate to System firmware about completion */
201
202 k3_gic_pcpu_init();
203 k3_gic_cpuif_enable();
204 }
205
k3_system_off(void)206 static void __dead2 k3_system_off(void)
207 {
208 ERROR("System Off: operation not handled.\n");
209 while (true)
210 wfi();
211 }
212
k3_system_reset(void)213 static void __dead2 k3_system_reset(void)
214 {
215 /* Send the system reset request to system firmware */
216 ti_sci_core_reboot();
217
218 while (true)
219 wfi();
220 }
221
k3_validate_power_state(unsigned int power_state,psci_power_state_t * req_state)222 static int k3_validate_power_state(unsigned int power_state,
223 psci_power_state_t *req_state)
224 {
225 /* TODO: perform the proper validation */
226
227 return PSCI_E_SUCCESS;
228 }
229
k3_validate_ns_entrypoint(uintptr_t entrypoint)230 static int k3_validate_ns_entrypoint(uintptr_t entrypoint)
231 {
232 /* TODO: perform the proper validation */
233
234 return PSCI_E_SUCCESS;
235 }
236
237 static const plat_psci_ops_t k3_plat_psci_ops = {
238 .cpu_standby = k3_cpu_standby,
239 .pwr_domain_on = k3_pwr_domain_on,
240 .pwr_domain_off = k3_pwr_domain_off,
241 .pwr_domain_on_finish = k3_pwr_domain_on_finish,
242 .system_off = k3_system_off,
243 .system_reset = k3_system_reset,
244 .validate_power_state = k3_validate_power_state,
245 .validate_ns_entrypoint = k3_validate_ns_entrypoint
246 };
247
plat_setup_psci_ops(uintptr_t sec_entrypoint,const plat_psci_ops_t ** psci_ops)248 int plat_setup_psci_ops(uintptr_t sec_entrypoint,
249 const plat_psci_ops_t **psci_ops)
250 {
251 k3_sec_entrypoint = sec_entrypoint;
252
253 *psci_ops = &k3_plat_psci_ops;
254
255 return 0;
256 }
257