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Tegra186: implement `get_target_pwr_state` handler 

This patch implements the `get_target_pwr_state` handler for Tegra186
SoCs. The SoC port uses this handler to find out the cluster/system
state during CPU_SUSPEND, CPU_OFF and SYSTEM_SUSPEND calls.

The MCE firmware controls the power state of the CPU/CLuster/System,
so we query it to get the state and act accordingly.

Change-Id: I86633d8d79aec7dcb405d2301ac69910f93110fe
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
pull/884/head
Varun Wadekar 9 years ago
parent
87a1df7361
commit
f3a20c3224
1 changed files with 117 additions and 84 deletions
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  1. 201
      plat/nvidia/tegra/soc/t186/plat_psci_handlers.c

201
plat/nvidia/tegra/soc/t186/plat_psci_handlers.c
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@ -37,6 +37,7 @@
#include <debug.h>
#include <denver.h>
#include <mce.h>
#include <platform.h>
#include <psci.h>
#include <smmu.h>
#include <string.h>
@ -71,12 +72,9 @@ int32_t tegra_soc_validate_power_state(unsigned int power_state,
psci_power_state_t *req_state)
{
int state_id = psci_get_pstate_id(power_state) & TEGRA186_STATE_ID_MASK;
int cpu = read_mpidr() & MPIDR_CPU_MASK;
int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK;
if (impl == DENVER_IMPL)
cpu |= 0x4;
int cpu = plat_my_core_pos();
/* save the core wake time (us) */
wake_time[cpu] = (power_state >> TEGRA186_WAKE_TIME_SHIFT) &
TEGRA186_WAKE_TIME_MASK;
@ -84,10 +82,10 @@ int32_t tegra_soc_validate_power_state(unsigned int power_state,
switch (state_id) {
case PSTATE_ID_CORE_IDLE:
case PSTATE_ID_CORE_POWERDN:
/*
* Core powerdown request only for afflvl 0
*/
/* Core powerdown request */
req_state->pwr_domain_state[MPIDR_AFFLVL0] = state_id;
req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id;
break;
@ -103,20 +101,12 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
{
const plat_local_state_t *pwr_domain_state;
unsigned int stateid_afflvl0, stateid_afflvl2;
int cpu = read_mpidr() & MPIDR_CPU_MASK;
int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK;
cpu_context_t *ctx = cm_get_context(NON_SECURE);
gp_regs_t *gp_regs = get_gpregs_ctx(ctx);
int cpu = plat_my_core_pos();
plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params();
mce_cstate_info_t cstate_info = { 0 };
uint64_t smmu_ctx_base;
uint32_t val;
assert(ctx);
assert(gp_regs);
if (impl == DENVER_IMPL)
cpu |= 0x4;
/* get the state ID */
pwr_domain_state = target_state->pwr_domain_state;
stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0] &
@ -124,29 +114,14 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] &
TEGRA186_STATE_ID_MASK;
if (stateid_afflvl0 == PSTATE_ID_CORE_IDLE) {
if ((stateid_afflvl0 == PSTATE_ID_CORE_IDLE) ||
(stateid_afflvl0 == PSTATE_ID_CORE_POWERDN)) {
/* Program default wake mask */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X5, TEGRA186_CORE_WAKE_MASK);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO, 0, 0, 0);
/* Prepare for cpu idle */
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE,
TEGRA_ARI_CORE_C6, wake_time[cpu], 0);
} else if (stateid_afflvl0 == PSTATE_ID_CORE_POWERDN) {
/* Program default wake mask */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X5, TEGRA186_CORE_WAKE_MASK);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO, 0, 0, 0);
/* Prepare for cpu powerdn */
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE,
TEGRA_ARI_CORE_C7, wake_time[cpu], 0);
/* Enter CPU idle/powerdown */
val = (stateid_afflvl0 == PSTATE_ID_CORE_IDLE) ?
TEGRA_ARI_CORE_C6 : TEGRA_ARI_CORE_C7;
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE, val,
wake_time[cpu], 0);
} else if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {
@ -170,11 +145,11 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
tegra_smmu_save_context((uintptr_t)smmu_ctx_base);
/* Prepare for system suspend */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 1);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC7, 0, TEGRA_ARI_SYSTEM_SC7);
cstate_info.cluster = TEGRA_ARI_CLUSTER_CC7;
cstate_info.system = TEGRA_ARI_SYSTEM_SC7;
cstate_info.system_state_force = 1;
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
/* Loop until system suspend is allowed */
do {
@ -187,15 +162,84 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
/* Instruct the MCE to enter system suspend state */
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE,
TEGRA_ARI_CORE_C7, MCE_CORE_SLEEP_TIME_INFINITE, 0);
} else {
ERROR("%s: Unknown state id\n", __func__);
return PSCI_E_NOT_SUPPORTED;
}
return PSCI_E_SUCCESS;
}
/*******************************************************************************
* Platform handler to calculate the proper target power level at the
* specified affinity level
******************************************************************************/
plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
const plat_local_state_t *states,
unsigned int ncpu)
{
plat_local_state_t target = *states;
int cpu = plat_my_core_pos(), ret, cluster_powerdn = 1;
int core_pos = read_mpidr() & MPIDR_CPU_MASK;
mce_cstate_info_t cstate_info = { 0 };
/* get the current core's power state */
target = *(states + core_pos);
/* CPU suspend */
if (lvl == MPIDR_AFFLVL1 && target == PSTATE_ID_CORE_POWERDN) {
/* Program default wake mask */
cstate_info.wake_mask = TEGRA186_CORE_WAKE_MASK;
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
/* Check if CCx state is allowed. */
ret = mce_command_handler(MCE_CMD_IS_CCX_ALLOWED,
TEGRA_ARI_CORE_C7, wake_time[cpu], 0);
if (ret)
return PSTATE_ID_CORE_POWERDN;
}
/* CPU off */
if (lvl == MPIDR_AFFLVL1 && target == PLAT_MAX_OFF_STATE) {
/* find out the number of ON cpus in the cluster */
do {
target = *states++;
if (target != PLAT_MAX_OFF_STATE)
cluster_powerdn = 0;
} while (--ncpu);
/* Enable cluster powerdn from last CPU in the cluster */
if (cluster_powerdn) {
/* Enable CC7 state and turn off wake mask */
cstate_info.cluster = TEGRA_ARI_CLUSTER_CC7;
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
/* Check if CCx state is allowed. */
ret = mce_command_handler(MCE_CMD_IS_CCX_ALLOWED,
TEGRA_ARI_CORE_C7,
MCE_CORE_SLEEP_TIME_INFINITE,
0);
if (ret)
return PSTATE_ID_CORE_POWERDN;
} else {
/* Turn off wake_mask */
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
}
}
/* System Suspend */
if ((lvl == MPIDR_AFFLVL2) || (target == PSTATE_ID_SOC_POWERDN))
return PSTATE_ID_SOC_POWERDN;
/* default state */
return PSCI_LOCAL_STATE_RUN;
}
int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state)
{
const plat_local_state_t *pwr_domain_state =
@ -244,8 +288,7 @@ int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
{
int stateid_afflvl2 = target_state->pwr_domain_state[PLAT_MAX_PWR_LVL];
int stateid_afflvl0 = target_state->pwr_domain_state[MPIDR_AFFLVL0];
cpu_context_t *ctx = cm_get_context(NON_SECURE);
gp_regs_t *gp_regs = get_gpregs_ctx(ctx);
mce_cstate_info_t cstate_info = { 0 };
/*
* Reset power state info for CPUs when onlining, we set
@ -256,11 +299,9 @@ int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
*/
if (stateid_afflvl0 == PLAT_MAX_OFF_STATE) {
write_ctx_reg(gp_regs, CTX_GPREG_X4, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC1, 0, 0);
cstate_info.cluster = TEGRA_ARI_CLUSTER_CC1;
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
}
/*
@ -280,15 +321,15 @@ int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
tegra_smmu_init();
/*
* Reset power state info for the last core doing SC7 entry and exit,
* we set deepest power state as CC7 and SC7 for SC7 entry which
* may not be requested by non-secure SW which controls idle states.
* Reset power state info for the last core doing SC7
* entry and exit, we set deepest power state as CC7
* and SC7 for SC7 entry which may not be requested by
* non-secure SW which controls idle states.
*/
write_ctx_reg(gp_regs, CTX_GPREG_X4, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC7, 0, TEGRA_ARI_SYSTEM_SC1);
cstate_info.cluster = TEGRA_ARI_CLUSTER_CC7;
cstate_info.system = TEGRA_ARI_SYSTEM_SC1;
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
}
return PSCI_E_SUCCESS;
@ -296,33 +337,22 @@ int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state)
{
cpu_context_t *ctx = cm_get_context(NON_SECURE);
gp_regs_t *gp_regs = get_gpregs_ctx(ctx);
int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK;
assert(ctx);
assert(gp_regs);
/* Turn off wake_mask */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO, TEGRA_ARI_CLUSTER_CC7,
0, 0);
/* Disable Denver's DCO operations */
if (impl == DENVER_IMPL)
denver_disable_dco();
/* Turn off CPU */
return mce_command_handler(MCE_CMD_ENTER_CSTATE, TEGRA_ARI_CORE_C7,
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE, TEGRA_ARI_CORE_C7,
MCE_CORE_SLEEP_TIME_INFINITE, 0);
return PSCI_E_SUCCESS;
}
__dead2 void tegra_soc_prepare_system_off(void)
{
cpu_context_t *ctx = cm_get_context(NON_SECURE);
gp_regs_t *gp_regs = get_gpregs_ctx(ctx);
mce_cstate_info_t cstate_info = { 0 };
uint32_t val;
if (tegra186_system_powerdn_state == TEGRA_ARI_MISC_CCPLEX_SHUTDOWN_POWER_OFF) {
@ -333,11 +363,11 @@ __dead2 void tegra_soc_prepare_system_off(void)
} else if (tegra186_system_powerdn_state == TEGRA_ARI_SYSTEM_SC8) {
/* Prepare for quasi power down */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 1);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC7, 0, TEGRA_ARI_SYSTEM_SC8);
cstate_info.cluster = TEGRA_ARI_CLUSTER_CC7;
cstate_info.system = TEGRA_ARI_SYSTEM_SC8;
cstate_info.system_state_force = 1;
cstate_info.update_wake_mask = 1;
mce_update_cstate_info(&cstate_info);
/* loop until other CPUs power down */
do {
@ -357,6 +387,9 @@ __dead2 void tegra_soc_prepare_system_off(void)
/* power down core */
prepare_cpu_pwr_dwn();
/* flush L1/L2 data caches */
dcsw_op_all(DCCISW);
} else {
ERROR("%s: unsupported power down state (%d)\n", __func__,
tegra186_system_powerdn_state);

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