Tegra210: support for cluster idle from the CPU
This patch adds support to enter/exit to/from cluster idle power state on Tegra210 platforms that do not load BPMP firmware. The CPU initates the cluster idle sequence on the last standing CPU, by following these steps: Entry ----- * stop other CPUs from waking up * program the PWM pinmux to tristate for OVR PMIC * program the flow controller to enter CC6 state * skip L1 $ flush during cluster power down, as L2 $ is inclusive of L1 $ on Cortex-A57 CPUs Exit ---- * program the PWM pinmux to un-tristate for OVR PMIC * allow other CPUs to wake up This patch also makes sure that cluster idle state entry is not enabled until CL-DVFS is ready. Change-Id: I54cf31bf72b4a09d9bf9d2baaed6ee5a963c7808 Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
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@ -137,6 +137,8 @@
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******************************************************************************/
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#define TEGRA_MISC_BASE U(0x70000000)
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#define HARDWARE_REVISION_OFFSET U(0x804)
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#define PINMUX_AUX_DVFS_PWM U(0x3184)
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#define PINMUX_PWM_TRISTATE (U(1) << 4)
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/*******************************************************************************
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* Tegra UART controller base addresses
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@ -193,6 +195,17 @@
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#define MC_SMMU_PPCS_ASID_0 0x270U
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#define PPCS_SMMU_ENABLE (0x1U << 31)
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/*******************************************************************************
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* Tegra CLDVFS constants
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******************************************************************************/
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#define TEGRA_CL_DVFS_BASE U(0x70110000)
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#define DVFS_DFLL_CTRL U(0x00)
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#define ENABLE_OPEN_LOOP U(1)
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#define ENABLE_CLOSED_LOOP U(2)
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#define DVFS_DFLL_OUTPUT_CFG U(0x20)
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#define DFLL_OUTPUT_CFG_I2C_EN_BIT (U(1) << 30)
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#define DFLL_OUTPUT_CFG_CLK_EN_BIT (U(1) << 6)
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/*******************************************************************************
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* Tegra SE constants
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******************************************************************************/
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
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* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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@ -35,6 +35,7 @@
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#define SCLK_BURST_POLICY_DEFAULT 0x10000000
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static int cpu_powergate_mask[PLATFORM_MAX_CPUS_PER_CLUSTER];
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static bool tegra_bpmp_available = true;
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int32_t tegra_soc_validate_power_state(unsigned int power_state,
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psci_power_state_t *req_state)
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@ -53,11 +54,12 @@ int32_t tegra_soc_validate_power_state(unsigned int power_state,
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case PSTATE_ID_CLUSTER_IDLE:
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case PSTATE_ID_CLUSTER_POWERDN:
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/*
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* Cluster powerdown/idle request only for afflvl 1
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* Cluster idle request for afflvl 0
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*/
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req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id;
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req_state->pwr_domain_state[MPIDR_AFFLVL0] = PSTATE_ID_CORE_POWERDN;
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req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id;
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break;
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@ -83,7 +85,7 @@ int32_t tegra_soc_validate_power_state(unsigned int power_state,
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/*******************************************************************************
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* Platform handler to calculate the proper target power level at the
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* specified affinity level
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* specified affinity level.
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******************************************************************************/
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plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
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const plat_local_state_t *states,
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@ -92,7 +94,7 @@ plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
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plat_local_state_t target = PSCI_LOCAL_STATE_RUN;
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int cpu = plat_my_core_pos();
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int core_pos = read_mpidr() & MPIDR_CPU_MASK;
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uint32_t bpmp_reply, data[3];
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uint32_t bpmp_reply, data[3], val;
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int ret;
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/* get the power state at this level */
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@ -109,9 +111,40 @@ plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
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/* Cluster idle not allowed */
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target = PSCI_LOCAL_STATE_RUN;
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/*******************************************
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* BPMP is not present, so handle CC6 entry
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* from the CPU
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******************************************/
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/* check if cluster idle state has been enabled */
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val = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL);
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if (val == ENABLE_CLOSED_LOOP) {
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/*
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* flag to indicate that BPMP firmware is not
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* available and the CPU has to handle entry/exit
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* for all power states
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*/
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tegra_bpmp_available = false;
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/*
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* Acquire the cluster idle lock to stop
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* other CPUs from powering up.
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*/
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tegra_fc_ccplex_pgexit_lock();
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/* Cluster idle only from the last standing CPU */
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if (tegra_pmc_is_last_on_cpu() && tegra_fc_is_ccx_allowed()) {
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/* Cluster idle allowed */
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target = PSTATE_ID_CLUSTER_IDLE;
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} else {
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/* release cluster idle lock */
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tegra_fc_ccplex_pgexit_unlock();
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}
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}
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} else {
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/* Cluster idle */
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/* Cluster power-down */
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data[0] = (uint32_t)cpu;
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data[1] = TEGRA_PM_CC6;
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data[2] = TEGRA_PM_SC1;
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@ -120,10 +153,10 @@ plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
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(void *)&bpmp_reply,
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(int)sizeof(bpmp_reply));
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/* check if cluster idle entry is allowed */
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/* check if cluster power down is allowed */
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if ((ret != 0L) || (bpmp_reply != BPMP_CCx_ALLOWED)) {
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/* Cluster idle not allowed */
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/* Cluster power down not allowed */
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target = PSCI_LOCAL_STATE_RUN;
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}
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}
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@ -176,7 +209,9 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
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unsigned int stateid_afflvl2 = pwr_domain_state[MPIDR_AFFLVL2];
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unsigned int stateid_afflvl1 = pwr_domain_state[MPIDR_AFFLVL1];
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unsigned int stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0];
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uint32_t cfg;
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int ret = PSCI_E_SUCCESS;
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uint32_t val;
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if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {
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@ -197,6 +232,17 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
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assert(stateid_afflvl0 == PSTATE_ID_CORE_POWERDN);
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if (!tegra_bpmp_available) {
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/* PWM tristate */
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cfg = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_OUTPUT_CFG);
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if (cfg & DFLL_OUTPUT_CFG_CLK_EN_BIT) {
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val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
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val |= PINMUX_PWM_TRISTATE;
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mmio_write_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM, val);
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}
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}
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/* Prepare for cluster idle */
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tegra_fc_cluster_idle(mpidr);
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@ -245,6 +291,7 @@ int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state)
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int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
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{
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const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
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uint32_t cfg;
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uint32_t val;
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/* platform parameter passed by the previous bootloader */
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@ -286,7 +333,29 @@ int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
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* Restore Boot and Power Management Processor (BPMP) reset
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* address and reset it.
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*/
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tegra_fc_reset_bpmp();
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if (tegra_bpmp_available)
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tegra_fc_reset_bpmp();
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}
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/*
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* Check if we are exiting cluster idle state
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*/
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if (target_state->pwr_domain_state[MPIDR_AFFLVL1] ==
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PSTATE_ID_CLUSTER_IDLE) {
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if (!tegra_bpmp_available) {
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/* PWM un-tristate */
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cfg = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_OUTPUT_CFG);
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if (cfg & DFLL_OUTPUT_CFG_CLK_EN_BIT) {
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val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
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val &= ~PINMUX_PWM_TRISTATE;
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mmio_write_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM, val);
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}
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/* release cluster idle lock */
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tegra_fc_ccplex_pgexit_unlock();
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}
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}
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/*
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ERRATA_A53_826319 := 1
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ERRATA_A53_836870 := 1
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ERRATA_A53_855873 := 1
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# Skip L1 $ flush when powering down Cortex-A57 CPUs
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SKIP_A57_L1_FLUSH_PWR_DWN := 1
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