1 /*
2 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
3 * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
4 *
5 * SPDX-License-Identifier: BSD-3-Clause
6 */
7
8 #include <assert.h>
9
10 #include <arch_helpers.h>
11 #include <bl32/payloads/tlk.h>
12 #include <common/bl_common.h>
13 #include <common/debug.h>
14 #include <lib/el3_runtime/context_mgmt.h>
15 #include <lib/psci/psci.h>
16
17 #include "tlkd_private.h"
18
19 extern tlk_context_t tlk_ctx;
20
21 #define MPIDR_CPU0 0x80000000
22
23 /*******************************************************************************
24 * Return the type of payload TLKD is dealing with. Report the current
25 * resident cpu (mpidr format) if it is a UP/UP migratable payload.
26 ******************************************************************************/
cpu_migrate_info(u_register_t * resident_cpu)27 static int32_t cpu_migrate_info(u_register_t *resident_cpu)
28 {
29 /* the payload runs only on CPU0 */
30 *resident_cpu = MPIDR_CPU0;
31
32 /* Uniprocessor, not migrate capable payload */
33 return PSCI_TOS_NOT_UP_MIG_CAP;
34 }
35
36 /*******************************************************************************
37 * This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so
38 * that it can pass this information to its Trusted Apps.
39 ******************************************************************************/
cpu_suspend_handler(u_register_t suspend_level)40 static void cpu_suspend_handler(u_register_t suspend_level)
41 {
42 gp_regs_t *gp_regs;
43 int cpu = read_mpidr() & MPIDR_CPU_MASK;
44 int32_t rc = 0;
45
46 /*
47 * TLK runs only on CPU0 and suspends its Trusted Apps during
48 * SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND.
49 */
50 if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
51 return;
52
53 /* pass system suspend event to TLK */
54 gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
55 write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND);
56
57 /* Program the entry point and enter TLK */
58 rc = tlkd_synchronous_sp_entry(&tlk_ctx);
59
60 /*
61 * Read the response from TLK. A non-zero return means that
62 * something went wrong while communicating with it.
63 */
64 if (rc != 0)
65 panic();
66 }
67
68 /*******************************************************************************
69 * This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so
70 * that it can pass this information to its Trusted Apps.
71 ******************************************************************************/
cpu_resume_handler(u_register_t suspend_level)72 static void cpu_resume_handler(u_register_t suspend_level)
73 {
74 gp_regs_t *gp_regs;
75 int cpu = read_mpidr() & MPIDR_CPU_MASK;
76 int32_t rc = 0;
77
78 /*
79 * TLK runs only on CPU0 and resumes its Trusted Apps during
80 * SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND
81 * exit.
82 */
83 if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
84 return;
85
86 /* pass system resume event to TLK */
87 gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
88 write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME);
89
90 /* Program the entry point and enter TLK */
91 rc = tlkd_synchronous_sp_entry(&tlk_ctx);
92
93 /*
94 * Read the response from TLK. A non-zero return means that
95 * something went wrong while communicating with it.
96 */
97 if (rc != 0)
98 panic();
99 }
100
101 /*******************************************************************************
102 * Structure populated by the Dispatcher to be given a chance to perform any
103 * bookkeeping before PSCI executes a power mgmt. operation.
104 ******************************************************************************/
105 const spd_pm_ops_t tlkd_pm_ops = {
106 .svc_migrate_info = cpu_migrate_info,
107 .svc_suspend = cpu_suspend_handler,
108 .svc_suspend_finish = cpu_resume_handler,
109 };
110