Home | History | Annotate | Download | only in tlkd 
      1 /*
      2  * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
      3  *
      4  * SPDX-License-Identifier: BSD-3-Clause
      5  */
      6 
      7 #include <arch_helpers.h>
      8 #include <assert.h>
      9 #include <bl_common.h>
     10 #include <context_mgmt.h>
     11 #include <debug.h>
     12 #include <psci.h>
     13 #include <tlk.h>
     14 
     15 #include "tlkd_private.h"
     16 
     17 extern tlk_context_t tlk_ctx;
     18 
     19 #define MPIDR_CPU0	0x80000000
     20 
     21 /*******************************************************************************
     22  * Return the type of payload TLKD is dealing with. Report the current
     23  * resident cpu (mpidr format) if it is a UP/UP migratable payload.
     24  ******************************************************************************/
     25 static int32_t cpu_migrate_info(uint64_t *resident_cpu)
     26 {
     27 	/* the payload runs only on CPU0 */
     28 	*resident_cpu = MPIDR_CPU0;
     29 
     30 	/* Uniprocessor, not migrate capable payload */
     31 	return PSCI_TOS_NOT_UP_MIG_CAP;
     32 }
     33 
     34 /*******************************************************************************
     35  * This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so
     36  * that it can pass this information to its Trusted Apps.
     37  ******************************************************************************/
     38 static void cpu_suspend_handler(uint64_t suspend_level)
     39 {
     40 	gp_regs_t *gp_regs;
     41 	int cpu = read_mpidr() & MPIDR_CPU_MASK;
     42 	int32_t rc = 0;
     43 
     44 	/*
     45 	 * TLK runs only on CPU0 and suspends its Trusted Apps during
     46 	 * SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND.
     47 	 */
     48 	if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
     49 		return;
     50 
     51 	/* pass system suspend event to TLK */
     52 	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
     53 	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND);
     54 
     55 	/* Program the entry point and enter TLK */
     56 	rc = tlkd_synchronous_sp_entry(&tlk_ctx);
     57 
     58 	/*
     59 	 * Read the response from TLK. A non-zero return means that
     60 	 * something went wrong while communicating with it.
     61 	 */
     62 	if (rc != 0)
     63 		panic();
     64 }
     65 
     66 /*******************************************************************************
     67  * This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so
     68  * that it can pass this information to its Trusted Apps.
     69  ******************************************************************************/
     70 static void cpu_resume_handler(uint64_t suspend_level)
     71 {
     72 	gp_regs_t *gp_regs;
     73 	int cpu = read_mpidr() & MPIDR_CPU_MASK;
     74 	int32_t rc = 0;
     75 
     76 	/*
     77 	 * TLK runs only on CPU0 and resumes its Trusted Apps during
     78 	 * SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND
     79 	 * exit.
     80 	 */
     81 	if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
     82 		return;
     83 
     84 	/* pass system resume event to TLK */
     85 	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
     86 	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME);
     87 
     88 	/* Program the entry point and enter TLK */
     89 	rc = tlkd_synchronous_sp_entry(&tlk_ctx);
     90 
     91 	/*
     92 	 * Read the response from TLK. A non-zero return means that
     93 	 * something went wrong while communicating with it.
     94 	 */
     95 	if (rc != 0)
     96 		panic();
     97 }
     98 
     99 /*******************************************************************************
    100  * System is about to be reset. Inform the SP to allow any book-keeping
    101  ******************************************************************************/
    102 static void system_off_handler(void)
    103 {
    104 	int cpu = read_mpidr() & MPIDR_CPU_MASK;
    105 	gp_regs_t *gp_regs;
    106 
    107 	/* TLK runs only on CPU0 */
    108 	if (cpu != 0)
    109 		return;
    110 
    111 	/* pass system off/reset events to TLK */
    112 	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
    113 	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_OFF);
    114 
    115 	/*
    116 	 * Enter the SP. We do not care about the return value because we
    117 	 * must continue with the shutdown anyway.
    118 	 */
    119 	(void)tlkd_synchronous_sp_entry(&tlk_ctx);
    120 }
    121 
    122 /*******************************************************************************
    123  * Structure populated by the Dispatcher to be given a chance to perform any
    124  * bookkeeping before PSCI executes a power mgmt.  operation.
    125  ******************************************************************************/
    126 const spd_pm_ops_t tlkd_pm_ops = {
    127 	.svc_migrate_info = cpu_migrate_info,
    128 	.svc_suspend = cpu_suspend_handler,
    129 	.svc_suspend_finish = cpu_resume_handler,
    130 	.svc_system_off = system_off_handler,
    131 	.svc_system_reset = system_off_handler
    132 };
    133