plat/nvidia/tegra/soc/t210/plat_psci_handlers.c - tf-a-mtk - Git at Google

 /*
  * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <assert.h>
 #include <cortex_a57.h>
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <drivers/delay_timer.h>
 #include <lib/mmio.h>
 #include <lib/psci/psci.h>
 #include <plat/common/platform.h>

 #include <bpmp.h>
 #include <flowctrl.h>
 #include <lib/utils.h>
 #include <memctrl.h>
 #include <pmc.h>
 #include <platform_def.h>
 #include <security_engine.h>
 #include <tegra_def.h>
 #include <tegra_private.h>
 #include <tegra_platform.h>

 /*
  * Register used to clear CPU reset signals. Each CPU has two reset
  * signals: CPU reset (3:0) and Core reset (19:16).
  */
 #define CPU_CMPLX_RESET_CLR		0x454
 #define CPU_CORE_RESET_MASK		0x10001

 /* Clock and Reset controller registers for system clock's settings */
 #define SCLK_RATE			0x30
 #define SCLK_BURST_POLICY		0x28
 #define SCLK_BURST_POLICY_DEFAULT	0x10000000

 static int cpu_powergate_mask[PLATFORM_MAX_CPUS_PER_CLUSTER];
 static bool tegra_bpmp_available = true;

 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);
 	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();

 	/* Sanity check the requested state id */
 	switch (state_id) {
 	case PSTATE_ID_CORE_POWERDN:
 		/*
 		 * Core powerdown request only for afflvl 0
 		 */
 		req_state->pwr_domain_state[MPIDR_AFFLVL0] = state_id & 0xff;

 		break;

 	case PSTATE_ID_CLUSTER_IDLE:

 		/*
 		 * Cluster idle request for afflvl 0
 		 */
 		req_state->pwr_domain_state[MPIDR_AFFLVL0] = PSTATE_ID_CORE_POWERDN;
 		req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id;
 		break;

 	case PSTATE_ID_SOC_POWERDN:

 		/*
 		 * sc7entry-fw must be present in the system when the bpmp
 		 * firmware is not present, for a successful System Suspend
 		 * entry.
 		 */
 		if (!tegra_bpmp_init() && !plat_params->sc7entry_fw_base)
 			return PSCI_E_NOT_SUPPORTED;

 		/*
 		 * System powerdown request only for afflvl 2
 		 */
 		for (uint32_t i = MPIDR_AFFLVL0; i < PLAT_MAX_PWR_LVL; i++)
 			req_state->pwr_domain_state[i] = PLAT_MAX_OFF_STATE;

 		req_state->pwr_domain_state[PLAT_MAX_PWR_LVL] =
 			PLAT_SYS_SUSPEND_STATE_ID;

 		break;

 	default:
 		ERROR("%s: unsupported state id (%d)\n", __func__, state_id);
 		return PSCI_E_INVALID_PARAMS;
 	}

 	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 = PSCI_LOCAL_STATE_RUN;
 	int cpu = plat_my_core_pos();
 	int core_pos = read_mpidr() & MPIDR_CPU_MASK;
 	uint32_t bpmp_reply, data[3], val;
 	int ret;

 	/* get the power state at this level */
 	if (lvl == MPIDR_AFFLVL1)
 		target = *(states + core_pos);
 	if (lvl == MPIDR_AFFLVL2)
 		target = *(states + cpu);

 	if ((lvl == MPIDR_AFFLVL1) && (target == PSTATE_ID_CLUSTER_IDLE)) {

 		/* initialize the bpmp interface */
 		ret = tegra_bpmp_init();
 		if (ret != 0U) {

 			/*
 			 * flag to indicate that BPMP firmware is not
 			 * available and the CPU has to handle entry/exit
 			 * for all power states
 			 */
 			tegra_bpmp_available = false;

 			/* Cluster idle not allowed */
 			target = PSCI_LOCAL_STATE_RUN;

 			/*******************************************
 			 * BPMP is not present, so handle CC6 entry
 			 * from the CPU
 			 ******************************************/

 			/* check if cluster idle state has been enabled */
 			val = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL);
 			if (val == ENABLE_CLOSED_LOOP) {
 				/*
 				 * Acquire the cluster idle lock to stop
 				 * other CPUs from powering up.
 				 */
 				tegra_fc_ccplex_pgexit_lock();

 				/* Cluster idle only from the last standing CPU */
 				if (tegra_pmc_is_last_on_cpu() && tegra_fc_is_ccx_allowed()) {
 					/* Cluster idle allowed */
 					target = PSTATE_ID_CLUSTER_IDLE;
 				} else {
 					/* release cluster idle lock */
 					tegra_fc_ccplex_pgexit_unlock();
 				}
 			}
 		} else {

 			/* Cluster power-down */
 			data[0] = (uint32_t)cpu;
 			data[1] = TEGRA_PM_CC6;
 			data[2] = TEGRA_PM_SC1;
 			ret = tegra_bpmp_send_receive_atomic(MRQ_DO_IDLE,
 					(void *)&data, (int)sizeof(data),
 					(void *)&bpmp_reply,
 					(int)sizeof(bpmp_reply));

 			/* check if cluster power down is allowed */
 			if ((ret != 0L) || (bpmp_reply != BPMP_CCx_ALLOWED)) {

 				/* Cluster power down not allowed */
 				target = PSCI_LOCAL_STATE_RUN;
 			}
 		}

 	} else if (((lvl == MPIDR_AFFLVL2) || (lvl == MPIDR_AFFLVL1)) &&
 	    (target == PSTATE_ID_SOC_POWERDN)) {

 		/* System Suspend */
 		target = PSTATE_ID_SOC_POWERDN;

 	} else {
 		; /* do nothing */
 	}

 	return target;
 }

 int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
 {
 	u_register_t mpidr = read_mpidr();
 	const plat_local_state_t *pwr_domain_state =
 		target_state->pwr_domain_state;
 	unsigned int stateid_afflvl2 = pwr_domain_state[MPIDR_AFFLVL2];
 	unsigned int stateid_afflvl1 = pwr_domain_state[MPIDR_AFFLVL1];
 	unsigned int stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0];
 	uint32_t cfg;
 	int ret = PSCI_E_SUCCESS;
 	uint32_t val;

 	if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {

 		assert((stateid_afflvl0 == PLAT_MAX_OFF_STATE) ||
 			(stateid_afflvl0 == PSTATE_ID_SOC_POWERDN));
 		assert((stateid_afflvl1 == PLAT_MAX_OFF_STATE) ||
 			(stateid_afflvl1 == PSTATE_ID_SOC_POWERDN));

 		if (tegra_chipid_is_t210_b01()) {

 			/* Suspend se/se2 and pka1 */
 			if (tegra_se_suspend() != 0) {
 				ret = PSCI_E_INTERN_FAIL;
 			}
 		}

 	} else if (stateid_afflvl1 == PSTATE_ID_CLUSTER_IDLE) {

 		assert(stateid_afflvl0 == PSTATE_ID_CORE_POWERDN);

 		if (!tegra_bpmp_available) {

 			/*
 			 * When disabled, DFLL loses its state. Enable
 			 * open loop state for the DFLL as we dont want
 			 * garbage values being written to the pmic
 			 * when we enter cluster idle state.
 			 */
 			mmio_write_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL,
 				      ENABLE_OPEN_LOOP);

 			/* Find if the platform uses OVR2/MAX77621 PMIC */
 			cfg = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_OUTPUT_CFG);
 			if (cfg & DFLL_OUTPUT_CFG_CLK_EN_BIT) {
 				/* OVR2 */

 				/* PWM tristate */
 				val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
 				val |= PINMUX_PWM_TRISTATE;
 				mmio_write_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM, val);

 				/*
 				 * SCRATCH201[1] is being used to identify CPU
 				 * PMIC in warmboot code.
 				 * 0 : OVR2
 				 * 1 : MAX77621
 				 */
 				tegra_pmc_write_32(PMC_SCRATCH201, 0x0);
 			} else {
 				/* MAX77621 */
 				tegra_pmc_write_32(PMC_SCRATCH201, 0x2);
 			}
 		}

 		/* Prepare for cluster idle */
 		tegra_fc_cluster_idle(mpidr);

 	} else if (stateid_afflvl0 == PSTATE_ID_CORE_POWERDN) {

 		/* Prepare for cpu powerdn */
 		tegra_fc_cpu_powerdn(mpidr);

 	} else {
 		ERROR("%s: Unknown state id (%d, %d, %d)\n", __func__,
 			stateid_afflvl2, stateid_afflvl1, stateid_afflvl0);
 		ret = PSCI_E_NOT_SUPPORTED;
 	}

 	return ret;
 }

 static void tegra_reset_all_dma_masters(void)
 {
 	uint32_t val, mask;

 	/*
 	 * Reset all possible DMA masters in the system.
 	 */
 	val = GPU_RESET_BIT;
 	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_GPU_RESET_REG_OFFSET, val);

 	val = NVENC_RESET_BIT | TSECB_RESET_BIT | APE_RESET_BIT |
 	      NVJPG_RESET_BIT | NVDEC_RESET_BIT;
 	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_Y, val);

 	val = HOST1X_RESET_BIT | ISP_RESET_BIT | USBD_RESET_BIT |
 	      VI_RESET_BIT | SDMMC4_RESET_BIT | SDMMC1_RESET_BIT |
 	      SDMMC2_RESET_BIT;
 	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_L, val);

 	val = USB2_RESET_BIT | APBDMA_RESET_BIT | AHBDMA_RESET_BIT;
 	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_H, val);

 	val = XUSB_DEV_RESET_BIT | XUSB_HOST_RESET_BIT | TSEC_RESET_BIT |
 	      PCIE_RESET_BIT | SDMMC3_RESET_BIT;
 	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_U, val);

 	val = SE_RESET_BIT | HDA_RESET_BIT | SATA_RESET_BIT;
 	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_V, val);

 	/*
 	 * If any of the DMA masters are still alive, assume
 	 * that the system has been compromised and reboot.
 	 */
 	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_GPU_RESET_REG_OFFSET);
 	mask = GPU_RESET_BIT;
 	if ((val & mask) != mask)
 		tegra_pmc_system_reset();

 	mask = NVENC_RESET_BIT | TSECB_RESET_BIT | APE_RESET_BIT |
 	      NVJPG_RESET_BIT | NVDEC_RESET_BIT;
 	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_Y);
 	if ((val & mask) != mask)
 		tegra_pmc_system_reset();

 	mask = HOST1X_RESET_BIT | ISP_RESET_BIT | USBD_RESET_BIT |
 	       VI_RESET_BIT | SDMMC4_RESET_BIT | SDMMC1_RESET_BIT |
 	       SDMMC2_RESET_BIT;
 	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_L);
 	if ((val & mask) != mask)
 		tegra_pmc_system_reset();

 	mask = USB2_RESET_BIT | APBDMA_RESET_BIT | AHBDMA_RESET_BIT;
 	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_H);
 	if ((val & mask) != mask)
 		tegra_pmc_system_reset();

 	mask = XUSB_DEV_RESET_BIT | XUSB_HOST_RESET_BIT | TSEC_RESET_BIT |
 	       PCIE_RESET_BIT | SDMMC3_RESET_BIT;
 	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_U);
 	if ((val & mask) != mask)
 		tegra_pmc_system_reset();

 	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_V);
 	mask = SE_RESET_BIT | HDA_RESET_BIT | SATA_RESET_BIT;
 	if ((val & mask) != mask)
 		tegra_pmc_system_reset();
 }

 int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state)
 {
 	u_register_t mpidr = read_mpidr();
 	const plat_local_state_t *pwr_domain_state =
 		target_state->pwr_domain_state;
 	unsigned int stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL];
 	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
 	uint32_t val;

 	if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {

 		if (tegra_chipid_is_t210_b01()) {
 			/* Save tzram contents */
 			tegra_se_save_tzram();
 		}

 		/* de-init the interface */
 		tegra_bpmp_suspend();

 		/*
 		 * The CPU needs to load the System suspend entry firmware
 		 * if nothing is running on the BPMP.
 		 */
 		if (!tegra_bpmp_available) {

 			/*
 			 * BPMP firmware is not running on the co-processor, so
 			 * we need to explicitly load the firmware to enable
 			 * entry/exit to/from System Suspend and set the BPMP
 			 * on its way.
 			 */

 			/* Power off BPMP before we proceed */
 			tegra_fc_bpmp_off();

 			/* bond out IRAM banks B, C and D */
 			mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_BOND_OUT_U,
 				IRAM_B_LOCK_BIT | IRAM_C_LOCK_BIT |
 				IRAM_D_LOCK_BIT);

 			/* bond out APB/AHB DMAs */
 			mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_BOND_OUT_H,
 				APB_DMA_LOCK_BIT | AHB_DMA_LOCK_BIT);

 			/* Power off BPMP before we proceed */
 			tegra_fc_bpmp_off();

 			/*
 			 * Reset all the hardware blocks that can act as DMA
 			 * masters on the bus.
 			 */
 			tegra_reset_all_dma_masters();

 			/* clean up IRAM of any cruft */
 			zeromem((void *)(uintptr_t)TEGRA_IRAM_BASE,
 					TEGRA_IRAM_A_SIZE);

 			/* Copy the firmware to BPMP's internal RAM */
 			(void)memcpy((void *)(uintptr_t)TEGRA_IRAM_BASE,
 				(const void *)(plat_params->sc7entry_fw_base + SC7ENTRY_FW_HEADER_SIZE_BYTES),
 				plat_params->sc7entry_fw_size - SC7ENTRY_FW_HEADER_SIZE_BYTES);

 			/* Power on the BPMP and execute from IRAM base */
 			tegra_fc_bpmp_on(TEGRA_IRAM_BASE);

 			/* Wait until BPMP powers up */
 			do {
 				val = mmio_read_32(TEGRA_RES_SEMA_BASE + STA_OFFSET);
 			} while (val != SIGN_OF_LIFE);
 		}

 		/* enter system suspend */
 		tegra_fc_soc_powerdn(mpidr);
 	}

 	return PSCI_E_SUCCESS;
 }

 int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
 {
 	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
 	uint32_t cfg;
 	uint32_t val, entrypoint = 0;
 	uint64_t offset;

 	/* platform parameter passed by the previous bootloader */
 	if (plat_params->l2_ecc_parity_prot_dis != 1) {
 		/* Enable ECC Parity Protection for Cortex-A57 CPUs */
 		val = read_l2ctlr_el1();
 		val |= (uint64_t)CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT;
 		write_l2ctlr_el1(val);
 	}

 	/*
 	 * Check if we are exiting from SOC_POWERDN.
 	 */
 	if (target_state->pwr_domain_state[PLAT_MAX_PWR_LVL] ==
 			PLAT_SYS_SUSPEND_STATE_ID) {

 		/*
 		 * Security engine resume
 		 */
 		if (tegra_chipid_is_t210_b01()) {
 			tegra_se_resume();
 		}

 		/*
 		 * Lock scratch registers which hold the CPU vectors
 		 */
 		tegra_pmc_lock_cpu_vectors();

 		/*
 		 * Enable WRAP to INCR burst type conversions for
 		 * incoming requests on the AXI slave ports.
 		 */
 		val = mmio_read_32(TEGRA_MSELECT_BASE + MSELECT_CONFIG);
 		val &= ~ENABLE_UNSUP_TX_ERRORS;
 		val |= ENABLE_WRAP_TO_INCR_BURSTS;
 		mmio_write_32(TEGRA_MSELECT_BASE + MSELECT_CONFIG, val);

 		/*
 		 * Restore Boot and Power Management Processor (BPMP) reset
 		 * address and reset it, if it is supported by the platform.
 		 */
 		if (!tegra_bpmp_available) {
 			tegra_fc_bpmp_off();
 		} else {
 			entrypoint = tegra_pmc_read_32(PMC_SCRATCH39);
 			tegra_fc_bpmp_on(entrypoint);

 			/* initialise the interface */
 			tegra_bpmp_resume();
 		}

 		/* sc7entry-fw is part of TZDRAM area */
 		if (plat_params->sc7entry_fw_base != 0U) {
 			offset = plat_params->tzdram_base - plat_params->sc7entry_fw_base;
 			tegra_memctrl_tzdram_setup(plat_params->sc7entry_fw_base,
 				plat_params->tzdram_size + offset);

 			/* restrict PMC access to secure world */
 			val = mmio_read_32(TEGRA_MISC_BASE + APB_SLAVE_SECURITY_ENABLE);
 			val |= PMC_SECURITY_EN_BIT;
 			mmio_write_32(TEGRA_MISC_BASE + APB_SLAVE_SECURITY_ENABLE, val);
 		}
 	}

 	/*
 	 * Check if we are exiting cluster idle state
 	 */
 	if (target_state->pwr_domain_state[MPIDR_AFFLVL1] ==
 			PSTATE_ID_CLUSTER_IDLE) {

 		if (!tegra_bpmp_available) {

 			/* PWM un-tristate */
 			cfg = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_OUTPUT_CFG);
 			if (cfg & DFLL_OUTPUT_CFG_CLK_EN_BIT) {
 				val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
 				val &= ~PINMUX_PWM_TRISTATE;
 				mmio_write_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM, val);

 				/* make sure the setting took effect */
 				val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
 				assert((val & PINMUX_PWM_TRISTATE) == 0U);
 			}

 			/*
 			 * Restore operation mode for the DFLL ring
 			 * oscillator
 			 */
 			mmio_write_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL,
 				      ENABLE_CLOSED_LOOP);

 			/* release cluster idle lock */
 			tegra_fc_ccplex_pgexit_unlock();
 		}
 	}

 	/*
 	 * T210 has a dedicated ARMv7 boot and power mgmt processor, BPMP. It's
 	 * used for power management and boot purposes. Inform the BPMP that
 	 * we have completed the cluster power up.
 	 */
 	tegra_fc_lock_active_cluster();

 	/*
          * Resume PMC hardware block for Tegra210 platforms supporting sc7entry-fw
          */
 	if (!tegra_chipid_is_t210_b01() && (plat_params->sc7entry_fw_base != 0U))
 		tegra_pmc_resume();

 	return PSCI_E_SUCCESS;
 }

 int tegra_soc_pwr_domain_on(u_register_t mpidr)
 {
 	int cpu = mpidr & MPIDR_CPU_MASK;
 	uint32_t mask = CPU_CORE_RESET_MASK << cpu;

 	/* Deassert CPU reset signals */
 	mmio_write_32(TEGRA_CAR_RESET_BASE + CPU_CMPLX_RESET_CLR, mask);

 	/* Turn on CPU using flow controller or PMC */
 	if (cpu_powergate_mask[cpu] == 0) {
 		tegra_pmc_cpu_on(cpu);
 		cpu_powergate_mask[cpu] = 1;
 	} else {
 		tegra_fc_cpu_on(cpu);
 	}

 	return PSCI_E_SUCCESS;
 }

 int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state)
 {
 	tegra_fc_cpu_off(read_mpidr() & MPIDR_CPU_MASK);
 	return PSCI_E_SUCCESS;
 }

 int tegra_soc_prepare_system_reset(void)
 {
 	/*
 	 * Set System Clock (SCLK) to POR default so that the clock source
 	 * for the PMC APB clock would not be changed due to system reset.
 	 */
 	mmio_write_32((uintptr_t)TEGRA_CAR_RESET_BASE + SCLK_BURST_POLICY,
 		SCLK_BURST_POLICY_DEFAULT);
 	mmio_write_32((uintptr_t)TEGRA_CAR_RESET_BASE + SCLK_RATE, 0);

 	/* Wait 1 ms to make sure clock source/device logic is stabilized. */
 	mdelay(1);

 	return PSCI_E_SUCCESS;
 }
	/*
	* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <assert.h>
	#include <cortex_a57.h>
	#include <arch_helpers.h>
	#include <common/debug.h>
	#include <drivers/delay_timer.h>
	#include <lib/mmio.h>
	#include <lib/psci/psci.h>
	#include <plat/common/platform.h>

	#include <bpmp.h>
	#include <flowctrl.h>
	#include <lib/utils.h>
	#include <memctrl.h>
	#include <pmc.h>
	#include <platform_def.h>
	#include <security_engine.h>
	#include <tegra_def.h>
	#include <tegra_private.h>
	#include <tegra_platform.h>

	/*
	* Register used to clear CPU reset signals. Each CPU has two reset
	* signals: CPU reset (3:0) and Core reset (19:16).
	*/
	#define CPU_CMPLX_RESET_CLR 0x454
	#define CPU_CORE_RESET_MASK 0x10001

	/* Clock and Reset controller registers for system clock's settings */
	#define SCLK_RATE 0x30
	#define SCLK_BURST_POLICY 0x28
	#define SCLK_BURST_POLICY_DEFAULT 0x10000000

	static int cpu_powergate_mask[PLATFORM_MAX_CPUS_PER_CLUSTER];
	static bool tegra_bpmp_available = true;

	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);
	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();

	/* Sanity check the requested state id */
	switch (state_id) {
	case PSTATE_ID_CORE_POWERDN:
	/*
	* Core powerdown request only for afflvl 0
	*/
	req_state->pwr_domain_state[MPIDR_AFFLVL0] = state_id & 0xff;

	break;

	case PSTATE_ID_CLUSTER_IDLE:

	/*
	* Cluster idle request for afflvl 0
	*/
	req_state->pwr_domain_state[MPIDR_AFFLVL0] = PSTATE_ID_CORE_POWERDN;
	req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id;
	break;

	case PSTATE_ID_SOC_POWERDN:

	/*
	* sc7entry-fw must be present in the system when the bpmp
	* firmware is not present, for a successful System Suspend
	* entry.
	*/
	if (!tegra_bpmp_init() && !plat_params->sc7entry_fw_base)
	return PSCI_E_NOT_SUPPORTED;

	/*
	* System powerdown request only for afflvl 2
	*/
	for (uint32_t i = MPIDR_AFFLVL0; i < PLAT_MAX_PWR_LVL; i++)
	req_state->pwr_domain_state[i] = PLAT_MAX_OFF_STATE;

	req_state->pwr_domain_state[PLAT_MAX_PWR_LVL] =
	PLAT_SYS_SUSPEND_STATE_ID;

	break;

	default:
	ERROR("%s: unsupported state id (%d)\n", __func__, state_id);
	return PSCI_E_INVALID_PARAMS;
	}

	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 = PSCI_LOCAL_STATE_RUN;
	int cpu = plat_my_core_pos();
	int core_pos = read_mpidr() & MPIDR_CPU_MASK;
	uint32_t bpmp_reply, data[3], val;
	int ret;

	/* get the power state at this level */
	if (lvl == MPIDR_AFFLVL1)
	target = *(states + core_pos);
	if (lvl == MPIDR_AFFLVL2)
	target = *(states + cpu);

	if ((lvl == MPIDR_AFFLVL1) && (target == PSTATE_ID_CLUSTER_IDLE)) {

	/* initialize the bpmp interface */
	ret = tegra_bpmp_init();
	if (ret != 0U) {

	/*
	* flag to indicate that BPMP firmware is not
	* available and the CPU has to handle entry/exit
	* for all power states
	*/
	tegra_bpmp_available = false;

	/* Cluster idle not allowed */
	target = PSCI_LOCAL_STATE_RUN;

	/*******************************************
	* BPMP is not present, so handle CC6 entry
	* from the CPU
	******************************************/

	/* check if cluster idle state has been enabled */
	val = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL);
	if (val == ENABLE_CLOSED_LOOP) {
	/*
	* Acquire the cluster idle lock to stop
	* other CPUs from powering up.
	*/
	tegra_fc_ccplex_pgexit_lock();

	/* Cluster idle only from the last standing CPU */
	if (tegra_pmc_is_last_on_cpu() && tegra_fc_is_ccx_allowed()) {
	/* Cluster idle allowed */
	target = PSTATE_ID_CLUSTER_IDLE;
	} else {
	/* release cluster idle lock */
	tegra_fc_ccplex_pgexit_unlock();
	}
	}
	} else {

	/* Cluster power-down */
	data[0] = (uint32_t)cpu;
	data[1] = TEGRA_PM_CC6;
	data[2] = TEGRA_PM_SC1;
	ret = tegra_bpmp_send_receive_atomic(MRQ_DO_IDLE,
	(void *)&data, (int)sizeof(data),
	(void *)&bpmp_reply,
	(int)sizeof(bpmp_reply));

	/* check if cluster power down is allowed */
	if ((ret != 0L) \|\| (bpmp_reply != BPMP_CCx_ALLOWED)) {

	/* Cluster power down not allowed */
	target = PSCI_LOCAL_STATE_RUN;
	}
	}

	} else if (((lvl == MPIDR_AFFLVL2) \|\| (lvl == MPIDR_AFFLVL1)) &&
	(target == PSTATE_ID_SOC_POWERDN)) {

	/* System Suspend */
	target = PSTATE_ID_SOC_POWERDN;

	} else {
	; /* do nothing */
	}

	return target;
	}

	int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
	{
	u_register_t mpidr = read_mpidr();
	const plat_local_state_t *pwr_domain_state =
	target_state->pwr_domain_state;
	unsigned int stateid_afflvl2 = pwr_domain_state[MPIDR_AFFLVL2];
	unsigned int stateid_afflvl1 = pwr_domain_state[MPIDR_AFFLVL1];
	unsigned int stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0];
	uint32_t cfg;
	int ret = PSCI_E_SUCCESS;
	uint32_t val;

	if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {

	assert((stateid_afflvl0 == PLAT_MAX_OFF_STATE) \|\|
	(stateid_afflvl0 == PSTATE_ID_SOC_POWERDN));
	assert((stateid_afflvl1 == PLAT_MAX_OFF_STATE) \|\|
	(stateid_afflvl1 == PSTATE_ID_SOC_POWERDN));

	if (tegra_chipid_is_t210_b01()) {

	/* Suspend se/se2 and pka1 */
	if (tegra_se_suspend() != 0) {
	ret = PSCI_E_INTERN_FAIL;
	}
	}

	} else if (stateid_afflvl1 == PSTATE_ID_CLUSTER_IDLE) {

	assert(stateid_afflvl0 == PSTATE_ID_CORE_POWERDN);

	if (!tegra_bpmp_available) {

	/*
	* When disabled, DFLL loses its state. Enable
	* open loop state for the DFLL as we dont want
	* garbage values being written to the pmic
	* when we enter cluster idle state.
	*/
	mmio_write_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL,
	ENABLE_OPEN_LOOP);

	/* Find if the platform uses OVR2/MAX77621 PMIC */
	cfg = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_OUTPUT_CFG);
	if (cfg & DFLL_OUTPUT_CFG_CLK_EN_BIT) {
	/* OVR2 */

	/* PWM tristate */
	val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
	val \|= PINMUX_PWM_TRISTATE;
	mmio_write_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM, val);

	/*
	* SCRATCH201[1] is being used to identify CPU
	* PMIC in warmboot code.
	* 0 : OVR2
	* 1 : MAX77621
	*/
	tegra_pmc_write_32(PMC_SCRATCH201, 0x0);
	} else {
	/* MAX77621 */
	tegra_pmc_write_32(PMC_SCRATCH201, 0x2);
	}
	}

	/* Prepare for cluster idle */
	tegra_fc_cluster_idle(mpidr);

	} else if (stateid_afflvl0 == PSTATE_ID_CORE_POWERDN) {

	/* Prepare for cpu powerdn */
	tegra_fc_cpu_powerdn(mpidr);

	} else {
	ERROR("%s: Unknown state id (%d, %d, %d)\n", __func__,
	stateid_afflvl2, stateid_afflvl1, stateid_afflvl0);
	ret = PSCI_E_NOT_SUPPORTED;
	}

	return ret;
	}

	static void tegra_reset_all_dma_masters(void)
	{
	uint32_t val, mask;

	/*
	* Reset all possible DMA masters in the system.
	*/
	val = GPU_RESET_BIT;
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_GPU_RESET_REG_OFFSET, val);

	val = NVENC_RESET_BIT \| TSECB_RESET_BIT \| APE_RESET_BIT \|
	NVJPG_RESET_BIT \| NVDEC_RESET_BIT;
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_Y, val);

	val = HOST1X_RESET_BIT \| ISP_RESET_BIT \| USBD_RESET_BIT \|
	VI_RESET_BIT \| SDMMC4_RESET_BIT \| SDMMC1_RESET_BIT \|
	SDMMC2_RESET_BIT;
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_L, val);

	val = USB2_RESET_BIT \| APBDMA_RESET_BIT \| AHBDMA_RESET_BIT;
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_H, val);

	val = XUSB_DEV_RESET_BIT \| XUSB_HOST_RESET_BIT \| TSEC_RESET_BIT \|
	PCIE_RESET_BIT \| SDMMC3_RESET_BIT;
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_U, val);

	val = SE_RESET_BIT \| HDA_RESET_BIT \| SATA_RESET_BIT;
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_V, val);

	/*
	* If any of the DMA masters are still alive, assume
	* that the system has been compromised and reboot.
	*/
	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_GPU_RESET_REG_OFFSET);
	mask = GPU_RESET_BIT;
	if ((val & mask) != mask)
	tegra_pmc_system_reset();

	mask = NVENC_RESET_BIT \| TSECB_RESET_BIT \| APE_RESET_BIT \|
	NVJPG_RESET_BIT \| NVDEC_RESET_BIT;
	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_Y);
	if ((val & mask) != mask)
	tegra_pmc_system_reset();

	mask = HOST1X_RESET_BIT \| ISP_RESET_BIT \| USBD_RESET_BIT \|
	VI_RESET_BIT \| SDMMC4_RESET_BIT \| SDMMC1_RESET_BIT \|
	SDMMC2_RESET_BIT;
	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_L);
	if ((val & mask) != mask)
	tegra_pmc_system_reset();

	mask = USB2_RESET_BIT \| APBDMA_RESET_BIT \| AHBDMA_RESET_BIT;
	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_H);
	if ((val & mask) != mask)
	tegra_pmc_system_reset();

	mask = XUSB_DEV_RESET_BIT \| XUSB_HOST_RESET_BIT \| TSEC_RESET_BIT \|
	PCIE_RESET_BIT \| SDMMC3_RESET_BIT;
	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_U);
	if ((val & mask) != mask)
	tegra_pmc_system_reset();

	val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_SET_V);
	mask = SE_RESET_BIT \| HDA_RESET_BIT \| SATA_RESET_BIT;
	if ((val & mask) != mask)
	tegra_pmc_system_reset();
	}

	int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state)
	{
	u_register_t mpidr = read_mpidr();
	const plat_local_state_t *pwr_domain_state =
	target_state->pwr_domain_state;
	unsigned int stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL];
	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
	uint32_t val;

	if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {

	if (tegra_chipid_is_t210_b01()) {
	/* Save tzram contents */
	tegra_se_save_tzram();
	}

	/* de-init the interface */
	tegra_bpmp_suspend();

	/*
	* The CPU needs to load the System suspend entry firmware
	* if nothing is running on the BPMP.
	*/
	if (!tegra_bpmp_available) {

	/*
	* BPMP firmware is not running on the co-processor, so
	* we need to explicitly load the firmware to enable
	* entry/exit to/from System Suspend and set the BPMP
	* on its way.
	*/

	/* Power off BPMP before we proceed */
	tegra_fc_bpmp_off();

	/* bond out IRAM banks B, C and D */
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_BOND_OUT_U,
	IRAM_B_LOCK_BIT \| IRAM_C_LOCK_BIT \|
	IRAM_D_LOCK_BIT);

	/* bond out APB/AHB DMAs */
	mmio_write_32(TEGRA_CAR_RESET_BASE + TEGRA_BOND_OUT_H,
	APB_DMA_LOCK_BIT \| AHB_DMA_LOCK_BIT);

	/* Power off BPMP before we proceed */
	tegra_fc_bpmp_off();

	/*
	* Reset all the hardware blocks that can act as DMA
	* masters on the bus.
	*/
	tegra_reset_all_dma_masters();

	/* clean up IRAM of any cruft */
	zeromem((void *)(uintptr_t)TEGRA_IRAM_BASE,
	TEGRA_IRAM_A_SIZE);

	/* Copy the firmware to BPMP's internal RAM */
	(void)memcpy((void *)(uintptr_t)TEGRA_IRAM_BASE,
	(const void *)(plat_params->sc7entry_fw_base + SC7ENTRY_FW_HEADER_SIZE_BYTES),
	plat_params->sc7entry_fw_size - SC7ENTRY_FW_HEADER_SIZE_BYTES);

	/* Power on the BPMP and execute from IRAM base */
	tegra_fc_bpmp_on(TEGRA_IRAM_BASE);

	/* Wait until BPMP powers up */
	do {
	val = mmio_read_32(TEGRA_RES_SEMA_BASE + STA_OFFSET);
	} while (val != SIGN_OF_LIFE);
	}

	/* enter system suspend */
	tegra_fc_soc_powerdn(mpidr);
	}

	return PSCI_E_SUCCESS;
	}

	int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
	{
	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
	uint32_t cfg;
	uint32_t val, entrypoint = 0;
	uint64_t offset;

	/* platform parameter passed by the previous bootloader */
	if (plat_params->l2_ecc_parity_prot_dis != 1) {
	/* Enable ECC Parity Protection for Cortex-A57 CPUs */
	val = read_l2ctlr_el1();
	val \|= (uint64_t)CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT;
	write_l2ctlr_el1(val);
	}

	/*
	* Check if we are exiting from SOC_POWERDN.
	*/
	if (target_state->pwr_domain_state[PLAT_MAX_PWR_LVL] ==
	PLAT_SYS_SUSPEND_STATE_ID) {

	/*
	* Security engine resume
	*/
	if (tegra_chipid_is_t210_b01()) {
	tegra_se_resume();
	}

	/*
	* Lock scratch registers which hold the CPU vectors
	*/
	tegra_pmc_lock_cpu_vectors();

	/*
	* Enable WRAP to INCR burst type conversions for
	* incoming requests on the AXI slave ports.
	*/
	val = mmio_read_32(TEGRA_MSELECT_BASE + MSELECT_CONFIG);
	val &= ~ENABLE_UNSUP_TX_ERRORS;
	val \|= ENABLE_WRAP_TO_INCR_BURSTS;
	mmio_write_32(TEGRA_MSELECT_BASE + MSELECT_CONFIG, val);

	/*
	* Restore Boot and Power Management Processor (BPMP) reset
	* address and reset it, if it is supported by the platform.
	*/
	if (!tegra_bpmp_available) {
	tegra_fc_bpmp_off();
	} else {
	entrypoint = tegra_pmc_read_32(PMC_SCRATCH39);
	tegra_fc_bpmp_on(entrypoint);

	/* initialise the interface */
	tegra_bpmp_resume();
	}

	/* sc7entry-fw is part of TZDRAM area */
	if (plat_params->sc7entry_fw_base != 0U) {
	offset = plat_params->tzdram_base - plat_params->sc7entry_fw_base;
	tegra_memctrl_tzdram_setup(plat_params->sc7entry_fw_base,
	plat_params->tzdram_size + offset);

	/* restrict PMC access to secure world */
	val = mmio_read_32(TEGRA_MISC_BASE + APB_SLAVE_SECURITY_ENABLE);
	val \|= PMC_SECURITY_EN_BIT;
	mmio_write_32(TEGRA_MISC_BASE + APB_SLAVE_SECURITY_ENABLE, val);
	}
	}

	/*
	* Check if we are exiting cluster idle state
	*/
	if (target_state->pwr_domain_state[MPIDR_AFFLVL1] ==
	PSTATE_ID_CLUSTER_IDLE) {

	if (!tegra_bpmp_available) {

	/* PWM un-tristate */
	cfg = mmio_read_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_OUTPUT_CFG);
	if (cfg & DFLL_OUTPUT_CFG_CLK_EN_BIT) {
	val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
	val &= ~PINMUX_PWM_TRISTATE;
	mmio_write_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM, val);

	/* make sure the setting took effect */
	val = mmio_read_32(TEGRA_MISC_BASE + PINMUX_AUX_DVFS_PWM);
	assert((val & PINMUX_PWM_TRISTATE) == 0U);
	}

	/*
	* Restore operation mode for the DFLL ring
	* oscillator
	*/
	mmio_write_32(TEGRA_CL_DVFS_BASE + DVFS_DFLL_CTRL,
	ENABLE_CLOSED_LOOP);

	/* release cluster idle lock */
	tegra_fc_ccplex_pgexit_unlock();
	}
	}

	/*
	* T210 has a dedicated ARMv7 boot and power mgmt processor, BPMP. It's
	* used for power management and boot purposes. Inform the BPMP that
	* we have completed the cluster power up.
	*/
	tegra_fc_lock_active_cluster();

	/*
	* Resume PMC hardware block for Tegra210 platforms supporting sc7entry-fw
	*/
	if (!tegra_chipid_is_t210_b01() && (plat_params->sc7entry_fw_base != 0U))
	tegra_pmc_resume();

	return PSCI_E_SUCCESS;
	}

	int tegra_soc_pwr_domain_on(u_register_t mpidr)
	{
	int cpu = mpidr & MPIDR_CPU_MASK;
	uint32_t mask = CPU_CORE_RESET_MASK << cpu;

	/* Deassert CPU reset signals */
	mmio_write_32(TEGRA_CAR_RESET_BASE + CPU_CMPLX_RESET_CLR, mask);

	/* Turn on CPU using flow controller or PMC */
	if (cpu_powergate_mask[cpu] == 0) {
	tegra_pmc_cpu_on(cpu);
	cpu_powergate_mask[cpu] = 1;
	} else {
	tegra_fc_cpu_on(cpu);
	}

	return PSCI_E_SUCCESS;
	}

	int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state)
	{
	tegra_fc_cpu_off(read_mpidr() & MPIDR_CPU_MASK);
	return PSCI_E_SUCCESS;
	}

	int tegra_soc_prepare_system_reset(void)
	{
	/*
	* Set System Clock (SCLK) to POR default so that the clock source
	* for the PMC APB clock would not be changed due to system reset.
	*/
	mmio_write_32((uintptr_t)TEGRA_CAR_RESET_BASE + SCLK_BURST_POLICY,
	SCLK_BURST_POLICY_DEFAULT);
	mmio_write_32((uintptr_t)TEGRA_CAR_RESET_BASE + SCLK_RATE, 0);

	/* Wait 1 ms to make sure clock source/device logic is stabilized. */
	mdelay(1);

	return PSCI_E_SUCCESS;
	}