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arm-trusted-firmware/plat/imx/imx8qx/imx8qx_psci.c
Anson Huang e6cf7a468e imx: power optimization for i.mx8qx 
Current implementation of i.MX8QX power management related
features does NOT optimize power number, all system resources
like CCI, DDR, and A cluster etc. are kept in STBY mode (powered
ON) when system suspend or CPU hotplug.

To lower the power number, OFF mode should be adopted for those
system resources whenever they can be OFF, A cluster will be OFF
if the CPUs in the cluster are all off line, DDR/MU/DB can be OFF
if system suspend, IRQ steer can be OFF if the wakeup source is
belonged to system controller partition, so wakeup source runtime
check is used to determine if IRQ steer can be OFF before system
suspend.

If resources are powered off for suspend, they should be restored
properly after system resume.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
2019-01-29 09:26:41 +08:00

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/*
* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdbool.h>
#include <arch.h>
#include <arch_helpers.h>
#include <common/debug.h>
#include <drivers/arm/gicv3.h>
#include <lib/mmio.h>
#include <lib/psci/psci.h>
#include <plat_imx8.h>
#include <sci/sci.h>
#include "../../common/sci/imx8_mu.h"
const static int ap_core_index[PLATFORM_CORE_COUNT] = {
SC_R_A35_0, SC_R_A35_1, SC_R_A35_2, SC_R_A35_3
};
/* save gic dist/redist context when GIC is power down */
static struct plat_gic_ctx imx_gicv3_ctx;
static unsigned int gpt_lpcg, gpt_reg[2];
static void imx_enable_irqstr_wakeup(void)
{
uint32_t irq_mask;
gicv3_dist_ctx_t *dist_ctx = &imx_gicv3_ctx.dist_ctx;
/* put IRQSTR into ON mode */
sc_pm_set_resource_power_mode(ipc_handle, SC_R_IRQSTR_SCU2, SC_PM_PW_MODE_ON);
/* enable the irqsteer to handle wakeup irq */
mmio_write_32(IMX_WUP_IRQSTR_BASE, 0x1);
for (int i = 0; i < 15; i++) {
irq_mask = dist_ctx->gicd_isenabler[i];
mmio_write_32(IMX_WUP_IRQSTR_BASE + 0x3c - 0x4 * i, irq_mask);
}
/* set IRQSTR low power mode */
if (imx_is_wakeup_src_irqsteer())
sc_pm_set_resource_power_mode(ipc_handle, SC_R_IRQSTR_SCU2, SC_PM_PW_MODE_STBY);
else
sc_pm_set_resource_power_mode(ipc_handle, SC_R_IRQSTR_SCU2, SC_PM_PW_MODE_OFF);
}
static void imx_disable_irqstr_wakeup(void)
{
/* Put IRQSTEER back to ON mode */
sc_pm_set_resource_power_mode(ipc_handle, SC_R_IRQSTR_SCU2, SC_PM_PW_MODE_ON);
/* disable the irqsteer */
mmio_write_32(IMX_WUP_IRQSTR_BASE, 0x0);
for (int i = 0; i < 16; i++)
mmio_write_32(IMX_WUP_IRQSTR_BASE + 0x4 + 0x4 * i, 0x0);
/* Put IRQSTEER into OFF mode */
sc_pm_set_resource_power_mode(ipc_handle, SC_R_IRQSTR_SCU2, SC_PM_PW_MODE_OFF);
}
int imx_pwr_domain_on(u_register_t mpidr)
{
int ret = PSCI_E_SUCCESS;
unsigned int cpu_id;
cpu_id = MPIDR_AFFLVL0_VAL(mpidr);
printf("imx_pwr_domain_on cpu_id %d\n", cpu_id);
if (sc_pm_set_resource_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_ON) != SC_ERR_NONE) {
ERROR("core %d power on failed!\n", cpu_id);
ret = PSCI_E_INTERN_FAIL;
}
if (sc_pm_cpu_start(ipc_handle, ap_core_index[cpu_id],
true, BL31_BASE) != SC_ERR_NONE) {
ERROR("boot core %d failed!\n", cpu_id);
ret = PSCI_E_INTERN_FAIL;
}
return ret;
}
void imx_pwr_domain_on_finish(const psci_power_state_t *target_state)
{
plat_gic_pcpu_init();
plat_gic_cpuif_enable();
}
int imx_validate_ns_entrypoint(uintptr_t ns_entrypoint)
{
return PSCI_E_SUCCESS;
}
void imx_pwr_domain_off(const psci_power_state_t *target_state)
{
u_register_t mpidr = read_mpidr_el1();
unsigned int cpu_id = MPIDR_AFFLVL0_VAL(mpidr);
plat_gic_cpuif_disable();
sc_pm_req_cpu_low_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_OFF, SC_PM_WAKE_SRC_NONE);
printf("turn off core:%d\n", cpu_id);
}
void imx_domain_suspend(const psci_power_state_t *target_state)
{
u_register_t mpidr = read_mpidr_el1();
unsigned int cpu_id = MPIDR_AFFLVL0_VAL(mpidr);
if (is_local_state_off(target_state->pwr_domain_state[MPIDR_AFFLVL0])) {
plat_gic_cpuif_disable();
sc_pm_set_cpu_resume(ipc_handle, ap_core_index[cpu_id], true, BL31_BASE);
sc_pm_req_cpu_low_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_OFF, SC_PM_WAKE_SRC_GIC);
} else {
dsb();
write_scr_el3(read_scr_el3() | SCR_FIQ_BIT);
isb();
}
if (is_local_state_off(target_state->pwr_domain_state[MPIDR_AFFLVL1]))
sc_pm_req_low_power_mode(ipc_handle, SC_R_A35, SC_PM_PW_MODE_OFF);
if (is_local_state_retn(target_state->pwr_domain_state[PLAT_MAX_PWR_LVL])) {
plat_gic_cpuif_disable();
/* save gic context */
plat_gic_save(cpu_id, &imx_gicv3_ctx);
/* enable the irqsteer for wakeup */
imx_enable_irqstr_wakeup();
/* Save GPT clock and registers, then turn off its power */
gpt_lpcg = mmio_read_32(IMX_GPT0_LPCG_BASE);
gpt_reg[0] = mmio_read_32(IMX_GPT0_BASE);
gpt_reg[1] = mmio_read_32(IMX_GPT0_BASE + 0x4);
sc_pm_set_resource_power_mode(ipc_handle, SC_R_GPT_0, SC_PM_PW_MODE_OFF);
sc_pm_req_low_power_mode(ipc_handle, SC_R_A35, SC_PM_PW_MODE_OFF);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_DDR,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_OFF);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_MU,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_OFF);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_INTERCONNECT,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_OFF);
/* Put GIC in OFF mode. */
sc_pm_set_resource_power_mode(ipc_handle, SC_R_GIC, SC_PM_PW_MODE_OFF);
sc_pm_set_cpu_resume(ipc_handle, ap_core_index[cpu_id], true, BL31_BASE);
if (imx_is_wakeup_src_irqsteer())
sc_pm_req_cpu_low_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_OFF, SC_PM_WAKE_SRC_IRQSTEER);
else
sc_pm_req_cpu_low_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_OFF, SC_PM_WAKE_SRC_SCU);
}
}
void imx_domain_suspend_finish(const psci_power_state_t *target_state)
{
u_register_t mpidr = read_mpidr_el1();
unsigned int cpu_id = MPIDR_AFFLVL0_VAL(mpidr);
if (is_local_state_retn(target_state->pwr_domain_state[PLAT_MAX_PWR_LVL])) {
MU_Resume(SC_IPC_BASE);
sc_pm_req_low_power_mode(ipc_handle, ap_core_index[cpu_id], SC_PM_PW_MODE_ON);
sc_pm_req_cpu_low_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_ON, SC_PM_WAKE_SRC_GIC);
/* Put GIC back to high power mode. */
sc_pm_set_resource_power_mode(ipc_handle, SC_R_GIC, SC_PM_PW_MODE_ON);
/* restore gic context */
plat_gic_restore(cpu_id, &imx_gicv3_ctx);
/* Turn on GPT power and restore its clock and registers */
sc_pm_set_resource_power_mode(ipc_handle, SC_R_GPT_0, SC_PM_PW_MODE_ON);
sc_pm_clock_enable(ipc_handle, SC_R_GPT_0, SC_PM_CLK_PER, true, 0);
mmio_write_32(IMX_GPT0_BASE, gpt_reg[0]);
mmio_write_32(IMX_GPT0_BASE + 0x4, gpt_reg[1]);
mmio_write_32(IMX_GPT0_LPCG_BASE, gpt_lpcg);
sc_pm_req_low_power_mode(ipc_handle, SC_R_A35, SC_PM_PW_MODE_ON);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_DDR,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_ON);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_MU,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_ON);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_INTERCONNECT,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_ON);
/* disable the irqsteer wakeup */
imx_disable_irqstr_wakeup();
plat_gic_cpuif_enable();
}
if (is_local_state_off(target_state->pwr_domain_state[MPIDR_AFFLVL1]))
sc_pm_req_low_power_mode(ipc_handle, SC_R_A35, SC_PM_PW_MODE_ON);
if (is_local_state_off(target_state->pwr_domain_state[MPIDR_AFFLVL0])) {
sc_pm_req_cpu_low_power_mode(ipc_handle, ap_core_index[cpu_id],
SC_PM_PW_MODE_ON, SC_PM_WAKE_SRC_GIC);
plat_gic_cpuif_enable();
} else {
write_scr_el3(read_scr_el3() & (~SCR_FIQ_BIT));
isb();
}
}
static const plat_psci_ops_t imx_plat_psci_ops = {
.pwr_domain_on = imx_pwr_domain_on,
.pwr_domain_on_finish = imx_pwr_domain_on_finish,
.validate_ns_entrypoint = imx_validate_ns_entrypoint,
.system_off = imx_system_off,
.system_reset = imx_system_reset,
.pwr_domain_off = imx_pwr_domain_off,
.pwr_domain_suspend = imx_domain_suspend,
.pwr_domain_suspend_finish = imx_domain_suspend_finish,
.get_sys_suspend_power_state = imx_get_sys_suspend_power_state,
.validate_power_state = imx_validate_power_state,
};
int plat_setup_psci_ops(uintptr_t sec_entrypoint,
const plat_psci_ops_t **psci_ops)
{
imx_mailbox_init(sec_entrypoint);
*psci_ops = &imx_plat_psci_ops;
/* make sure system sources power ON in low power mode by default */
sc_pm_req_low_power_mode(ipc_handle, SC_R_A35, SC_PM_PW_MODE_ON);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_DDR,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_ON);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_MU,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_ON);
sc_pm_req_sys_if_power_mode(ipc_handle, SC_R_A35, SC_PM_SYS_IF_INTERCONNECT,
SC_PM_PW_MODE_ON, SC_PM_PW_MODE_ON);
return 0;
}
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