1 /*
2 * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <arch_helpers.h>
10 #include <common/bl_common.h>
11 #include <common/debug.h>
12 #include <lib/el3_runtime/context_mgmt.h>
13 #include <plat/common/platform.h>
14
15 #include "opteed_private.h"
16
17 /*******************************************************************************
18 * The target cpu is being turned on. Allow the OPTEED/OPTEE to perform any
19 * actions needed. Nothing at the moment.
20 ******************************************************************************/
opteed_cpu_on_handler(u_register_t target_cpu)21 static void opteed_cpu_on_handler(u_register_t target_cpu)
22 {
23 }
24
25 /*******************************************************************************
26 * This cpu is being turned off. Allow the OPTEED/OPTEE to perform any actions
27 * needed
28 ******************************************************************************/
opteed_cpu_off_handler(u_register_t unused)29 static int32_t opteed_cpu_off_handler(u_register_t unused)
30 {
31 int32_t rc = 0;
32 uint32_t linear_id = plat_my_core_pos();
33 optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
34
35 assert(optee_vector_table);
36 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
37
38 /* Program the entry point and enter OPTEE */
39 cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_off_entry);
40 rc = opteed_synchronous_sp_entry(optee_ctx);
41
42 /*
43 * Read the response from OPTEE. A non-zero return means that
44 * something went wrong while communicating with OPTEE.
45 */
46 if (rc != 0)
47 panic();
48
49 /*
50 * Reset OPTEE's context for a fresh start when this cpu is turned on
51 * subsequently.
52 */
53 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF);
54
55 return 0;
56 }
57
58 /*******************************************************************************
59 * This cpu is being suspended. S-EL1 state must have been saved in the
60 * resident cpu (mpidr format) if it is a UP/UP migratable OPTEE.
61 ******************************************************************************/
opteed_cpu_suspend_handler(u_register_t max_off_pwrlvl)62 static void opteed_cpu_suspend_handler(u_register_t max_off_pwrlvl)
63 {
64 int32_t rc = 0;
65 uint32_t linear_id = plat_my_core_pos();
66 optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
67
68 assert(optee_vector_table);
69 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
70
71 write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx), CTX_GPREG_X0,
72 max_off_pwrlvl);
73
74 /* Program the entry point and enter OPTEE */
75 cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_suspend_entry);
76 rc = opteed_synchronous_sp_entry(optee_ctx);
77
78 /*
79 * Read the response from OPTEE. A non-zero return means that
80 * something went wrong while communicating with OPTEE.
81 */
82 if (rc != 0)
83 panic();
84
85 /* Update its context to reflect the state OPTEE is in */
86 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_SUSPEND);
87 }
88
89 /*******************************************************************************
90 * This cpu has been turned on. Enter OPTEE to initialise S-EL1 and other bits
91 * before passing control back to the Secure Monitor. Entry in S-El1 is done
92 * after initialising minimal architectural state that guarantees safe
93 * execution.
94 ******************************************************************************/
opteed_cpu_on_finish_handler(u_register_t unused)95 static void opteed_cpu_on_finish_handler(u_register_t unused)
96 {
97 int32_t rc = 0;
98 uint32_t linear_id = plat_my_core_pos();
99 optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
100 entry_point_info_t optee_on_entrypoint;
101
102 assert(optee_vector_table);
103 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_OFF);
104
105 opteed_init_optee_ep_state(&optee_on_entrypoint, opteed_rw,
106 (uint64_t)&optee_vector_table->cpu_on_entry,
107 0, 0, 0, optee_ctx);
108
109 /* Initialise this cpu's secure context */
110 cm_init_my_context(&optee_on_entrypoint);
111
112 /* Enter OPTEE */
113 rc = opteed_synchronous_sp_entry(optee_ctx);
114
115 /*
116 * Read the response from OPTEE. A non-zero return means that
117 * something went wrong while communicating with OPTEE.
118 */
119 if (rc != 0)
120 panic();
121
122 /* Update its context to reflect the state OPTEE is in */
123 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
124 }
125
126 /*******************************************************************************
127 * This cpu has resumed from suspend. The OPTEED saved the OPTEE context when it
128 * completed the preceding suspend call. Use that context to program an entry
129 * into OPTEE to allow it to do any remaining book keeping
130 ******************************************************************************/
opteed_cpu_suspend_finish_handler(u_register_t max_off_pwrlvl)131 static void opteed_cpu_suspend_finish_handler(u_register_t max_off_pwrlvl)
132 {
133 int32_t rc = 0;
134 uint32_t linear_id = plat_my_core_pos();
135 optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
136
137 assert(optee_vector_table);
138 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_SUSPEND);
139
140 /* Program the entry point, max_off_pwrlvl and enter the SP */
141 write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
142 CTX_GPREG_X0,
143 max_off_pwrlvl);
144 cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_resume_entry);
145 rc = opteed_synchronous_sp_entry(optee_ctx);
146
147 /*
148 * Read the response from OPTEE. A non-zero return means that
149 * something went wrong while communicating with OPTEE.
150 */
151 if (rc != 0)
152 panic();
153
154 /* Update its context to reflect the state OPTEE is in */
155 set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
156 }
157
158 /*******************************************************************************
159 * Return the type of OPTEE the OPTEED is dealing with. Report the current
160 * resident cpu (mpidr format) if it is a UP/UP migratable OPTEE.
161 ******************************************************************************/
opteed_cpu_migrate_info(u_register_t * resident_cpu)162 static int32_t opteed_cpu_migrate_info(u_register_t *resident_cpu)
163 {
164 return OPTEE_MIGRATE_INFO;
165 }
166
167 /*******************************************************************************
168 * System is about to be switched off. Allow the OPTEED/OPTEE to perform
169 * any actions needed.
170 ******************************************************************************/
opteed_system_off(void)171 static void opteed_system_off(void)
172 {
173 uint32_t linear_id = plat_my_core_pos();
174 optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
175
176 assert(optee_vector_table);
177 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
178
179 /* Program the entry point */
180 cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->system_off_entry);
181
182 /* Enter OPTEE. We do not care about the return value because we
183 * must continue the shutdown anyway */
184 opteed_synchronous_sp_entry(optee_ctx);
185 }
186
187 /*******************************************************************************
188 * System is about to be reset. Allow the OPTEED/OPTEE to perform
189 * any actions needed.
190 ******************************************************************************/
opteed_system_reset(void)191 static void opteed_system_reset(void)
192 {
193 uint32_t linear_id = plat_my_core_pos();
194 optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
195
196 assert(optee_vector_table);
197 assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
198
199 /* Program the entry point */
200 cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->system_reset_entry);
201
202 /* Enter OPTEE. We do not care about the return value because we
203 * must continue the reset anyway */
204 opteed_synchronous_sp_entry(optee_ctx);
205 }
206
207
208 /*******************************************************************************
209 * Structure populated by the OPTEE Dispatcher to be given a chance to
210 * perform any OPTEE bookkeeping before PSCI executes a power mgmt.
211 * operation.
212 ******************************************************************************/
213 const spd_pm_ops_t opteed_pm = {
214 .svc_on = opteed_cpu_on_handler,
215 .svc_off = opteed_cpu_off_handler,
216 .svc_suspend = opteed_cpu_suspend_handler,
217 .svc_on_finish = opteed_cpu_on_finish_handler,
218 .svc_suspend_finish = opteed_cpu_suspend_finish_handler,
219 .svc_migrate = NULL,
220 .svc_migrate_info = opteed_cpu_migrate_info,
221 .svc_system_off = opteed_system_off,
222 .svc_system_reset = opteed_system_reset,
223 };
224