diff options
Diffstat (limited to 'services/spd/tlkd/tlkd_pm.c')
| -rw-r--r-- | services/spd/tlkd/tlkd_pm.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/services/spd/tlkd/tlkd_pm.c b/services/spd/tlkd/tlkd_pm.c index 5f2bae31..1eff0aad 100644 --- a/services/spd/tlkd/tlkd_pm.c +++ b/services/spd/tlkd/tlkd_pm.c @@ -28,7 +28,17 @@ * POSSIBILITY OF SUCH DAMAGE. */ +#include <arch_helpers.h> +#include <assert.h> +#include <bl_common.h> +#include <context_mgmt.h> +#include <debug.h> #include <psci.h> +#include <tlk.h> + +#include "tlkd_private.h" + +extern tlk_context_t tlk_ctx; #define MPIDR_CPU0 0x80000000 @@ -46,9 +56,101 @@ static int32_t cpu_migrate_info(uint64_t *resident_cpu) } /******************************************************************************* + * This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so + * that it can pass this information to its Trusted Apps. + ******************************************************************************/ +static void cpu_suspend_handler(uint64_t suspend_level) +{ + gp_regs_t *gp_regs; + int cpu = read_mpidr() & MPIDR_CPU_MASK; + int32_t rc = 0; + + /* + * TLK runs only on CPU0 and suspends its Trusted Apps during + * SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND. + */ + if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL)) + return; + + /* pass system suspend event to TLK */ + gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx); + write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND); + + /* Program the entry point and enter TLK */ + rc = tlkd_synchronous_sp_entry(&tlk_ctx); + + /* + * Read the response from TLK. A non-zero return means that + * something went wrong while communicating with it. + */ + if (rc != 0) + panic(); +} + +/******************************************************************************* + * This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so + * that it can pass this information to its Trusted Apps. + ******************************************************************************/ +static void cpu_resume_handler(uint64_t suspend_level) +{ + gp_regs_t *gp_regs; + int cpu = read_mpidr() & MPIDR_CPU_MASK; + int32_t rc = 0; + + /* + * TLK runs only on CPU0 and resumes its Trusted Apps during + * SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND + * exit. + */ + if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL)) + return; + + /* pass system resume event to TLK */ + gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx); + write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME); + + /* Program the entry point and enter TLK */ + rc = tlkd_synchronous_sp_entry(&tlk_ctx); + + /* + * Read the response from TLK. A non-zero return means that + * something went wrong while communicating with it. + */ + if (rc != 0) + panic(); +} + +/******************************************************************************* + * System is about to be reset. Inform the SP to allow any book-keeping + ******************************************************************************/ +static void system_off_handler(void) +{ + int cpu = read_mpidr() & MPIDR_CPU_MASK; + gp_regs_t *gp_regs; + + /* TLK runs only on CPU0 */ + if (cpu != 0) + return; + + /* pass system off/reset events to TLK */ + gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx); + write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_OFF); + + /* + * Enter the SP. We do not care about the return value because we + * must continue with the shutdown anyway. + */ + (void)tlkd_synchronous_sp_entry(&tlk_ctx); +} + +/******************************************************************************* * Structure populated by the Dispatcher to be given a chance to perform any * bookkeeping before PSCI executes a power mgmt. operation. ******************************************************************************/ const spd_pm_ops_t tlkd_pm_ops = { .svc_migrate_info = cpu_migrate_info, + .svc_suspend = cpu_suspend_handler, + .svc_suspend_finish = cpu_resume_handler, + .svc_system_off = system_off_handler, + .svc_system_reset = system_off_handler }; |