diff options
Diffstat (limited to 'plat/amlogic/g12a/g12a_pm.c')
| -rw-r--r-- | plat/amlogic/g12a/g12a_pm.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/plat/amlogic/g12a/g12a_pm.c b/plat/amlogic/g12a/g12a_pm.c new file mode 100644 index 0000000..c9fe3e9 --- /dev/null +++ b/plat/amlogic/g12a/g12a_pm.c @@ -0,0 +1,215 @@ +/* + * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch_helpers.h> +#include <assert.h> +#include <common/debug.h> +#include <drivers/arm/gicv2.h> +#include <drivers/console.h> +#include <errno.h> +#include <lib/mmio.h> +#include <lib/psci/psci.h> +#include <plat/common/platform.h> +#include <platform_def.h> + +#include "aml_private.h" + +#define SCPI_POWER_ON 0 +#define SCPI_POWER_RETENTION 1 +#define SCPI_POWER_OFF 3 + +#define SCPI_SYSTEM_SHUTDOWN 0 +#define SCPI_SYSTEM_REBOOT 1 + +static uintptr_t g12a_sec_entrypoint; +static volatile uint32_t g12a_cpu0_go; + +static void g12a_pm_set_reset_addr(u_register_t mpidr, uint64_t value) +{ + unsigned int core = plat_calc_core_pos(mpidr); + uintptr_t cpu_mailbox_addr = AML_PSCI_MAILBOX_BASE + (core << 4); + + mmio_write_64(cpu_mailbox_addr, value); +} + +static void g12a_pm_reset(u_register_t mpidr) +{ + unsigned int core = plat_calc_core_pos(mpidr); + uintptr_t cpu_mailbox_addr = AML_PSCI_MAILBOX_BASE + (core << 4) + 8; + + mmio_write_32(cpu_mailbox_addr, 0); +} + +static void __dead2 g12a_system_reset(void) +{ + INFO("BL31: PSCI_SYSTEM_RESET\n"); + + u_register_t mpidr = read_mpidr_el1(); + uint32_t status = mmio_read_32(AML_AO_RTI_STATUS_REG3); + int ret; + + NOTICE("BL31: Reboot reason: 0x%x\n", status); + + status &= 0xFFFF0FF0; + + console_flush(); + + mmio_write_32(AML_AO_RTI_STATUS_REG3, status); + + ret = aml_scpi_sys_power_state(SCPI_SYSTEM_REBOOT); + + if (ret != 0) { + ERROR("BL31: PSCI_SYSTEM_RESET: SCP error: %i\n", ret); + panic(); + } + + g12a_pm_reset(mpidr); + + wfi(); + + ERROR("BL31: PSCI_SYSTEM_RESET: Operation not handled\n"); + panic(); +} + +static void __dead2 g12a_system_off(void) +{ + INFO("BL31: PSCI_SYSTEM_OFF\n"); + + u_register_t mpidr = read_mpidr_el1(); + int ret; + + ret = aml_scpi_sys_power_state(SCPI_SYSTEM_SHUTDOWN); + + if (ret != 0) { + ERROR("BL31: PSCI_SYSTEM_OFF: SCP error %i\n", ret); + panic(); + } + + g12a_pm_set_reset_addr(mpidr, 0); + g12a_pm_reset(mpidr); + + wfi(); + + ERROR("BL31: PSCI_SYSTEM_OFF: Operation not handled\n"); + panic(); +} + +static int32_t g12a_pwr_domain_on(u_register_t mpidr) +{ + unsigned int core = plat_calc_core_pos(mpidr); + + /* CPU0 can't be turned OFF */ + if (core == AML_PRIMARY_CPU) { + VERBOSE("BL31: Releasing CPU0 from wait loop...\n"); + + g12a_cpu0_go = 1; + flush_dcache_range((uintptr_t)&g12a_cpu0_go, + sizeof(g12a_cpu0_go)); + dsb(); + isb(); + + sev(); + + return PSCI_E_SUCCESS; + } + + g12a_pm_set_reset_addr(mpidr, g12a_sec_entrypoint); + aml_scpi_set_css_power_state(mpidr, + SCPI_POWER_ON, SCPI_POWER_ON, SCPI_POWER_ON); + dmbsy(); + sev(); + + return PSCI_E_SUCCESS; +} + +static void g12a_pwr_domain_on_finish(const psci_power_state_t *target_state) +{ + unsigned int core = plat_calc_core_pos(read_mpidr_el1()); + + assert(target_state->pwr_domain_state[MPIDR_AFFLVL0] == + PLAT_LOCAL_STATE_OFF); + + if (core == AML_PRIMARY_CPU) { + g12a_cpu0_go = 0; + flush_dcache_range((uintptr_t)&g12a_cpu0_go, + sizeof(g12a_cpu0_go)); + dsb(); + isb(); + } + + gicv2_pcpu_distif_init(); + gicv2_cpuif_enable(); +} + +static void g12a_pwr_domain_off(const psci_power_state_t *target_state) +{ + u_register_t mpidr = read_mpidr_el1(); + unsigned int core = plat_calc_core_pos(mpidr); + + gicv2_cpuif_disable(); + + /* CPU0 can't be turned OFF */ + if (core == AML_PRIMARY_CPU) + return; + + aml_scpi_set_css_power_state(mpidr, + SCPI_POWER_OFF, SCPI_POWER_ON, + SCPI_POWER_ON); +} + +static void __dead2 g12a_pwr_domain_pwr_down_wfi(const psci_power_state_t + *target_state) +{ + u_register_t mpidr = read_mpidr_el1(); + unsigned int core = plat_calc_core_pos(mpidr); + + /* CPU0 can't be turned OFF, emulate it with a WFE loop */ + if (core == AML_PRIMARY_CPU) { + VERBOSE("BL31: CPU0 entering wait loop...\n"); + + while (g12a_cpu0_go == 0) + wfe(); + + VERBOSE("BL31: CPU0 resumed.\n"); + + /* + * Because setting CPU0's warm reset entrypoint through PSCI + * mailbox and/or mmio mapped RVBAR (0xda834650) does not seem + * to work, jump to it manually. + * In order to avoid an assert, MMU has to be disabled. + */ + disable_mmu_el3(); + ((void(*)(void))g12a_sec_entrypoint)(); + } + + dsbsy(); + g12a_pm_set_reset_addr(mpidr, 0); + g12a_pm_reset(mpidr); + + for (;;) + wfi(); +} + +/******************************************************************************* + * Platform handlers and setup function. + ******************************************************************************/ +static const plat_psci_ops_t g12a_ops = { + .pwr_domain_on = g12a_pwr_domain_on, + .pwr_domain_on_finish = g12a_pwr_domain_on_finish, + .pwr_domain_off = g12a_pwr_domain_off, + .pwr_domain_pwr_down_wfi = g12a_pwr_domain_pwr_down_wfi, + .system_off = g12a_system_off, + .system_reset = g12a_system_reset +}; + +int plat_setup_psci_ops(uintptr_t sec_entrypoint, + const plat_psci_ops_t **psci_ops) +{ + g12a_sec_entrypoint = sec_entrypoint; + *psci_ops = &g12a_ops; + g12a_cpu0_go = 0; + return 0; +} |