plat/intel/soc/common/drivers/ddr/ddr.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2022, Intel Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <assert.h>
 #include <errno.h>
 #include <common/debug.h>
 #include "ddr.h"
 #include <lib/mmio.h>
 #include "socfpga_handoff.h"

 int ddr_calibration_check(void)
 {
 	// DDR calibration check
 	int status = 0;
 	uint32_t u32data_read = 0;

 	NOTICE("DDR: Access address 0x%x:...\n", IO96B_0_REG_BASE);
 	u32data_read = mmio_read_32(IO96B_0_REG_BASE);
 	NOTICE("DDR: Access address 0x%x: read 0x%04x\n", IO96B_0_REG_BASE, u32data_read);

 	if (u32data_read == -EPERM) {
 		status = -EPERM;
 		assert(u32data_read);
 	}

 	u32data_read = 0x0;
 	NOTICE("DDR: Access address 0x%x: ...\n", IO96B_1_REG_BASE);
 	u32data_read = mmio_read_32(IO96B_1_REG_BASE);
 	NOTICE("DDR: Access address 0x%x: read 0x%04x\n", IO96B_1_REG_BASE, u32data_read);

 	if (u32data_read == -EPERM) {
 		status = -EPERM;
 		assert(u32data_read);
 	}

 	return status;
 }

 int iossm_mb_init(void)
 {
 	// int status;

 	// Update according to IOSSM mailbox spec

 	// if (status) {
 		// return status;
 	// }

 	return 0;
 }

 int wait_respond(uint16_t timeout)
 {
 	uint32_t status = 0;
 	uint32_t count = 0;
 	uint32_t data = 0;

 	/* Wait status command response ready */
 	do {
 		data = mmio_read_32(IO96B_CSR_REG(CMD_RESPONSE_STATUS));
 		count++;
 		if (count >= timeout) {
 			return -ETIMEDOUT;
 		}

 	} while (STATUS_COMMAND_RESPONSE(data) != STATUS_COMMAND_RESPONSE_READY);

 	status = (data & STATUS_GENERAL_ERROR_MASK) >> STATUS_GENERAL_ERROR_OFFSET;
 	if (status != 0) {
 		return status;
 	}

 	status = (data & STATUS_CMD_RESPONSE_ERROR_MASK) >> STATUS_CMD_RESPONSE_ERROR_OFFSET;
 	if (status != 0) {
 		return status;
 	}

 	return status;
 }

 int iossm_mb_read_response(void)
 {
 	uint32_t status = 0;
 	unsigned int i;
 	uint32_t resp_data[IOSSM_RESP_MAX_WORD_SIZE];
 	uint32_t resp_param_reg;

 	// Check STATUS_CMD_RESPONSE_DATA_PTR_VALID in
 	// STATUS_COMMAND_RESPONSE to ensure data pointer response

 	/* Read CMD_RESPONSE_STATUS and CMD_RESPONSE_DATA_* */
 	resp_data[0] = mmio_read_32(IO96B_CSR_REG(CMD_RESPONSE_STATUS));
 	resp_data[0] = (resp_data[0] & CMD_RESPONSE_DATA_SHORT_MASK) >>
 			CMD_RESPONSE_DATA_SHORT_OFFSET;
 	resp_param_reg = CMD_RESPONSE_STATUS;
 	for (i = 1; i < IOSSM_RESP_MAX_WORD_SIZE; i++) {
 		resp_param_reg = resp_param_reg - CMD_RESPONSE_OFFSET;
 		resp_data[i] = mmio_read_32(IO96B_CSR_REG(resp_param_reg));
 	}

 	/* Wait for STATUS_COMMAND_RESPONSE_READY*/
 	status = wait_respond(1000);

 	/* Read CMD_RESPONSE_STATUS and CMD_RESPONSE_DATA_* */
 	mmio_setbits_32(STATUS_COMMAND_RESPONSE(IO96B_CSR_REG(
 			CMD_RESPONSE_STATUS)),
 			STATUS_COMMAND_RESPONSE_READY_CLEAR);

 	return status;
 }

 int iossm_mb_send(uint32_t cmd_target_ip_type, uint32_t cmd_target_ip_instance_id,
 			uint32_t cmd_type, uint32_t cmd_opcode, uint32_t *args,
 			unsigned int len)
 {
 	unsigned int i;
 	uint32_t status = 0;
 	uint32_t cmd_req;
 	uint32_t cmd_param_reg;

 	cmd_target_ip_type = (cmd_target_ip_type & CMD_TARGET_IP_TYPE_MASK) <<
 				CMD_TARGET_IP_TYPE_OFFSET;
 	cmd_target_ip_instance_id = (cmd_target_ip_instance_id &
 				CMD_TARGET_IP_INSTANCE_ID_MASK) <<
 				CMD_TARGET_IP_INSTANCE_ID_OFFSET;
 	cmd_type = (cmd_type & CMD_TYPE_MASK) << CMD_TYPE_OFFSET;
 	cmd_opcode = (cmd_opcode & CMD_OPCODE_MASK) << CMD_OPCODE_OFFSET;
 	cmd_req = cmd_target_ip_type | cmd_target_ip_instance_id | cmd_type |
 			cmd_opcode;

 	/* send mailbox request */
 	IOSSM_MB_WRITE(IO96B_CSR_REG(CMD_REQ), cmd_req);
 	if (len != 0) {
 		cmd_param_reg = CMD_REQ;
 		for (i = 0; i < len; i++) {
 			cmd_param_reg = cmd_param_reg - CMD_PARAM_OFFSET;
 			IOSSM_MB_WRITE(IO96B_CSR_REG(cmd_param_reg), args[i]);
 		}
 	}

 	status = iossm_mb_read_response();
 	if (status != 0) {
 		return status;
 	}

 	return status;
 }

 int ddr_iossm_mailbox_cmd(uint32_t cmd_opcode)
 {
 	// IOSSM
 	uint32_t status = 0;
 	unsigned int i = 0;
 	uint32_t payload[IOSSM_CMD_MAX_WORD_SIZE] = {0U};

 	switch (cmd_opcode) {
 	case CMD_INIT:
 		status = iossm_mb_init();
 		break;

 	case OPCODE_GET_MEM_INTF_INFO:
 		status = iossm_mb_send(0, 0, MBOX_CMD_GET_SYS_INFO,
 		OPCODE_GET_MEM_INTF_INFO, payload, i);
 		break;

 	case OPCODE_GET_MEM_TECHNOLOGY:
 		status = iossm_mb_send(0, 0, MBOX_CMD_GET_MEM_INFO,
 		OPCODE_GET_MEM_TECHNOLOGY, payload, i);
 		break;

 	case OPCODE_GET_MEM_WIDTH_INFO:
 		status = iossm_mb_send(0, 0, MBOX_CMD_GET_MEM_INFO,
 		OPCODE_GET_MEM_WIDTH_INFO, payload, i);
 		break;

 	case OPCODE_ECC_ENABLE_STATUS:
 		status = iossm_mb_send(0, 0,
 		MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_ENABLE_STATUS,
 		payload, i);
 		break;

 	case OPCODE_ECC_INTERRUPT_MASK:
 		// payload[i] = CMD_PARAM_0 [16:0]: ECC_INTERRUPT_MASK
 		status = iossm_mb_send(0, 0,
 		MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_INTERRUPT_MASK,
 		payload, i);
 		break;

 	case OPCODE_ECC_SCRUB_MODE_0_START:
 		// payload[i] = CMD_PARAM_0 [15:0]: ECC_SCRUB_INTERVAL
 		//i++;
 		// payload[i] = CMD_PARAM_1 [11:0]: ECC_SCRUB_LEN
 		//i++;
 		// payload[i] = CMD_PARAM_2 [0:0]: ECC_SCRUB_FULL_MEM
 		//i++;
 		// payload[i]= CMD_PARAM_3 [31:0]: ECC_SCRUB_START_ADDR [31:0]
 		//i++;
 		// payload[i] = CMD_PARAM_4 [5:0]: ECC_SCRUB_START_ADDR [36:32]
 		//i++;
 		// payload[i] = CMD_PARAM_5 [31:0]: ECC_SCRUB_END_ADDR [31:0]
 		//i++;
 		// payload[i] = CMD_PARAM_6 [5:0]: ECC_SCRUB_END_ADDR [36:32]
 		//i++;
 		status = iossm_mb_send(0, 0,
 		MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_SCRUB_MODE_0_START,
 		payload, i);
 		break;

 	case OPCODE_ECC_SCRUB_MODE_1_START:
 		// payload[i] = CMD_PARAM_0 [15:0]: ECC_SCRUB_IDLE_CNT
 		//i++;
 		// payload[i] = CMD_PARAM_1 [11:0]: ECC_SCRUB_LEN
 		//i++;
 		// payload[i] = CMD_PARAM_2 [0:0]: ECC_SCRUB_FULL_MEM
 		//i++;
 		// payload[i] = CMD_PARAM_3 [31:0]: ECC_SCRUB_START_ADDR [31:0]
 		//i++;
 		// payload[i] = CMD_PARAM_4 [5:0]: ECC_SCRUB_START_ADDR [36:32]
 		//i++;
 		// payload[i] = CMD_PARAM_5 [31:0]: ECC_SCRUB_END_ADDR [31:0]
 		//i++;
 		// payload[i] = CMD_PARAM_6 [5:0]: ECC_SCRUB_END_ADDR [36:32]
 		//i++;
 		status = iossm_mb_send(0, 0,
 		MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_SCRUB_MODE_1_START,
 		payload, i);
 		break;

 	case OPCODE_BIST_RESULTS_STATUS:
 		status = iossm_mb_send(0, 0,
 		MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_BIST_RESULTS_STATUS,
 		payload, i);
 		break;

 	case OPCODE_BIST_MEM_INIT_START:
 		status = iossm_mb_send(0, 0,
 		MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_BIST_MEM_INIT_START,
 		payload, i);
 		break;

 	case OPCODE_TRIG_MEM_CAL:
 		status = iossm_mb_send(0, 0, MBOX_CMD_TRIG_MEM_CAL_OP,
 		OPCODE_TRIG_MEM_CAL, payload, i);
 		break;

 	default:
 		break;
 	}

 	if (status == -EPERM) {
 		assert(status);
 	}

 	return status;
 }

 int ddr_config_handoff(handoff *hoff_ptr)
 {
 	/* Populate DDR handoff data */
 	/* TODO: To add in DDR handoff configuration once available */
 	return 0;
 }

 // DDR firewall and non secure access
 void ddr_enable_ns_access(void)
 {
 	/* Please set the ddr non secure registers accordingly */

 	mmio_setbits_32(CCU_REG(DMI0_DMIUSMCTCR),
 			CCU_DMI_ALLOCEN | CCU_DMI_LOOKUPEN);
 	mmio_setbits_32(CCU_REG(DMI1_DMIUSMCTCR),
 			CCU_DMI_ALLOCEN | CCU_DMI_LOOKUPEN);

 	/* TODO: To add in CCU NCORE OCRAM bypass mask for non secure registers */
 	NOTICE("DDR non secure configured\n");
 }

 void ddr_enable_firewall(void)
 {
 	/* Please set the ddr firewall registers accordingly */
 	/* TODO: To add in CCU NCORE OCRAM bypass mask for firewall registers */
 	NOTICE("DDR firewall enabled\n");
 }

 bool is_ddr_init_in_progress(void)
 {
 	uint32_t reg = mmio_read_32(SOCFPGA_SYSMGR(BOOT_SCRATCH_POR_0));

 	if (reg & SOCFPGA_SYSMGR_BOOT_SCRATCH_POR_0_MASK) {
 		return true;
 	}
 	return false;
 }

 int ddr_init(void)
 {
 	// DDR driver initialization
 	int status = -EPERM;
 	uint32_t cmd_opcode = 0;

 	// Check and set Boot Scratch Register
 	if (is_ddr_init_in_progress()) {
 		return status;
 	}
 	mmio_write_32(SOCFPGA_SYSMGR(BOOT_SCRATCH_POR_0), 0x01);

 	// Populate DDR handoff data
 	handoff reverse_handoff_ptr;

 	if (!socfpga_get_handoff(&reverse_handoff_ptr)) {
 		assert(status);
 	}
 	status = ddr_config_handoff(&reverse_handoff_ptr);
 	if (status == -EPERM) {
 		assert(status);
 	}

 	// CCU and firewall setup
 	ddr_enable_ns_access();
 	ddr_enable_firewall();

 	// DDR calibration check
 	status = ddr_calibration_check();
 	if (status == -EPERM) {
 		assert(status);
 	}

 	// DDR mailbox command
 	status = ddr_iossm_mailbox_cmd(cmd_opcode);
 	if (status != 0) {
 		assert(status);
 	}

 	// Check and set Boot Scratch Register
 	mmio_write_32(SOCFPGA_SYSMGR(BOOT_SCRATCH_POR_0), 0x00);

 	NOTICE("DDR init successfully\n");
 	return status;
 }
	/*
	* Copyright (c) 2022, Intel Corporation. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <assert.h>
	#include <errno.h>
	#include <common/debug.h>
	#include "ddr.h"
	#include <lib/mmio.h>
	#include "socfpga_handoff.h"

	int ddr_calibration_check(void)
	{
	// DDR calibration check
	int status = 0;
	uint32_t u32data_read = 0;

	NOTICE("DDR: Access address 0x%x:...\n", IO96B_0_REG_BASE);
	u32data_read = mmio_read_32(IO96B_0_REG_BASE);
	NOTICE("DDR: Access address 0x%x: read 0x%04x\n", IO96B_0_REG_BASE, u32data_read);

	if (u32data_read == -EPERM) {
	status = -EPERM;
	assert(u32data_read);
	}

	u32data_read = 0x0;
	NOTICE("DDR: Access address 0x%x: ...\n", IO96B_1_REG_BASE);
	u32data_read = mmio_read_32(IO96B_1_REG_BASE);
	NOTICE("DDR: Access address 0x%x: read 0x%04x\n", IO96B_1_REG_BASE, u32data_read);

	if (u32data_read == -EPERM) {
	status = -EPERM;
	assert(u32data_read);
	}

	return status;
	}

	int iossm_mb_init(void)
	{
	// int status;

	// Update according to IOSSM mailbox spec

	// if (status) {
	// return status;
	// }

	return 0;
	}

	int wait_respond(uint16_t timeout)
	{
	uint32_t status = 0;
	uint32_t count = 0;
	uint32_t data = 0;

	/* Wait status command response ready */
	do {
	data = mmio_read_32(IO96B_CSR_REG(CMD_RESPONSE_STATUS));
	count++;
	if (count >= timeout) {
	return -ETIMEDOUT;
	}

	} while (STATUS_COMMAND_RESPONSE(data) != STATUS_COMMAND_RESPONSE_READY);

	status = (data & STATUS_GENERAL_ERROR_MASK) >> STATUS_GENERAL_ERROR_OFFSET;
	if (status != 0) {
	return status;
	}

	status = (data & STATUS_CMD_RESPONSE_ERROR_MASK) >> STATUS_CMD_RESPONSE_ERROR_OFFSET;
	if (status != 0) {
	return status;
	}

	return status;
	}

	int iossm_mb_read_response(void)
	{
	uint32_t status = 0;
	unsigned int i;
	uint32_t resp_data[IOSSM_RESP_MAX_WORD_SIZE];
	uint32_t resp_param_reg;

	// Check STATUS_CMD_RESPONSE_DATA_PTR_VALID in
	// STATUS_COMMAND_RESPONSE to ensure data pointer response

	/* Read CMD_RESPONSE_STATUS and CMD_RESPONSE_DATA_* */
	resp_data[0] = mmio_read_32(IO96B_CSR_REG(CMD_RESPONSE_STATUS));
	resp_data[0] = (resp_data[0] & CMD_RESPONSE_DATA_SHORT_MASK) >>
	CMD_RESPONSE_DATA_SHORT_OFFSET;
	resp_param_reg = CMD_RESPONSE_STATUS;
	for (i = 1; i < IOSSM_RESP_MAX_WORD_SIZE; i++) {
	resp_param_reg = resp_param_reg - CMD_RESPONSE_OFFSET;
	resp_data[i] = mmio_read_32(IO96B_CSR_REG(resp_param_reg));
	}

	/* Wait for STATUS_COMMAND_RESPONSE_READY*/
	status = wait_respond(1000);

	/* Read CMD_RESPONSE_STATUS and CMD_RESPONSE_DATA_* */
	mmio_setbits_32(STATUS_COMMAND_RESPONSE(IO96B_CSR_REG(
	CMD_RESPONSE_STATUS)),
	STATUS_COMMAND_RESPONSE_READY_CLEAR);

	return status;
	}

	int iossm_mb_send(uint32_t cmd_target_ip_type, uint32_t cmd_target_ip_instance_id,
	uint32_t cmd_type, uint32_t cmd_opcode, uint32_t *args,
	unsigned int len)
	{
	unsigned int i;
	uint32_t status = 0;
	uint32_t cmd_req;
	uint32_t cmd_param_reg;

	cmd_target_ip_type = (cmd_target_ip_type & CMD_TARGET_IP_TYPE_MASK) <<
	CMD_TARGET_IP_TYPE_OFFSET;
	cmd_target_ip_instance_id = (cmd_target_ip_instance_id &
	CMD_TARGET_IP_INSTANCE_ID_MASK) <<
	CMD_TARGET_IP_INSTANCE_ID_OFFSET;
	cmd_type = (cmd_type & CMD_TYPE_MASK) << CMD_TYPE_OFFSET;
	cmd_opcode = (cmd_opcode & CMD_OPCODE_MASK) << CMD_OPCODE_OFFSET;
	cmd_req = cmd_target_ip_type \| cmd_target_ip_instance_id \| cmd_type \|
	cmd_opcode;

	/* send mailbox request */
	IOSSM_MB_WRITE(IO96B_CSR_REG(CMD_REQ), cmd_req);
	if (len != 0) {
	cmd_param_reg = CMD_REQ;
	for (i = 0; i < len; i++) {
	cmd_param_reg = cmd_param_reg - CMD_PARAM_OFFSET;
	IOSSM_MB_WRITE(IO96B_CSR_REG(cmd_param_reg), args[i]);
	}
	}

	status = iossm_mb_read_response();
	if (status != 0) {
	return status;
	}

	return status;
	}

	int ddr_iossm_mailbox_cmd(uint32_t cmd_opcode)
	{
	// IOSSM
	uint32_t status = 0;
	unsigned int i = 0;
	uint32_t payload[IOSSM_CMD_MAX_WORD_SIZE] = {0U};

	switch (cmd_opcode) {
	case CMD_INIT:
	status = iossm_mb_init();
	break;

	case OPCODE_GET_MEM_INTF_INFO:
	status = iossm_mb_send(0, 0, MBOX_CMD_GET_SYS_INFO,
	OPCODE_GET_MEM_INTF_INFO, payload, i);
	break;

	case OPCODE_GET_MEM_TECHNOLOGY:
	status = iossm_mb_send(0, 0, MBOX_CMD_GET_MEM_INFO,
	OPCODE_GET_MEM_TECHNOLOGY, payload, i);
	break;

	case OPCODE_GET_MEM_WIDTH_INFO:
	status = iossm_mb_send(0, 0, MBOX_CMD_GET_MEM_INFO,
	OPCODE_GET_MEM_WIDTH_INFO, payload, i);
	break;

	case OPCODE_ECC_ENABLE_STATUS:
	status = iossm_mb_send(0, 0,
	MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_ENABLE_STATUS,
	payload, i);
	break;

	case OPCODE_ECC_INTERRUPT_MASK:
	// payload[i] = CMD_PARAM_0 [16:0]: ECC_INTERRUPT_MASK
	status = iossm_mb_send(0, 0,
	MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_INTERRUPT_MASK,
	payload, i);
	break;

	case OPCODE_ECC_SCRUB_MODE_0_START:
	// payload[i] = CMD_PARAM_0 [15:0]: ECC_SCRUB_INTERVAL
	//i++;
	// payload[i] = CMD_PARAM_1 [11:0]: ECC_SCRUB_LEN
	//i++;
	// payload[i] = CMD_PARAM_2 [0:0]: ECC_SCRUB_FULL_MEM
	//i++;
	// payload[i]= CMD_PARAM_3 [31:0]: ECC_SCRUB_START_ADDR [31:0]
	//i++;
	// payload[i] = CMD_PARAM_4 [5:0]: ECC_SCRUB_START_ADDR [36:32]
	//i++;
	// payload[i] = CMD_PARAM_5 [31:0]: ECC_SCRUB_END_ADDR [31:0]
	//i++;
	// payload[i] = CMD_PARAM_6 [5:0]: ECC_SCRUB_END_ADDR [36:32]
	//i++;
	status = iossm_mb_send(0, 0,
	MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_SCRUB_MODE_0_START,
	payload, i);
	break;

	case OPCODE_ECC_SCRUB_MODE_1_START:
	// payload[i] = CMD_PARAM_0 [15:0]: ECC_SCRUB_IDLE_CNT
	//i++;
	// payload[i] = CMD_PARAM_1 [11:0]: ECC_SCRUB_LEN
	//i++;
	// payload[i] = CMD_PARAM_2 [0:0]: ECC_SCRUB_FULL_MEM
	//i++;
	// payload[i] = CMD_PARAM_3 [31:0]: ECC_SCRUB_START_ADDR [31:0]
	//i++;
	// payload[i] = CMD_PARAM_4 [5:0]: ECC_SCRUB_START_ADDR [36:32]
	//i++;
	// payload[i] = CMD_PARAM_5 [31:0]: ECC_SCRUB_END_ADDR [31:0]
	//i++;
	// payload[i] = CMD_PARAM_6 [5:0]: ECC_SCRUB_END_ADDR [36:32]
	//i++;
	status = iossm_mb_send(0, 0,
	MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_ECC_SCRUB_MODE_1_START,
	payload, i);
	break;

	case OPCODE_BIST_RESULTS_STATUS:
	status = iossm_mb_send(0, 0,
	MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_BIST_RESULTS_STATUS,
	payload, i);
	break;

	case OPCODE_BIST_MEM_INIT_START:
	status = iossm_mb_send(0, 0,
	MBOX_CMD_TRIG_CONTROLLER_OP, OPCODE_BIST_MEM_INIT_START,
	payload, i);
	break;

	case OPCODE_TRIG_MEM_CAL:
	status = iossm_mb_send(0, 0, MBOX_CMD_TRIG_MEM_CAL_OP,
	OPCODE_TRIG_MEM_CAL, payload, i);
	break;

	default:
	break;
	}

	if (status == -EPERM) {
	assert(status);
	}

	return status;
	}

	int ddr_config_handoff(handoff *hoff_ptr)
	{
	/* Populate DDR handoff data */
	/* TODO: To add in DDR handoff configuration once available */
	return 0;
	}

	// DDR firewall and non secure access
	void ddr_enable_ns_access(void)
	{
	/* Please set the ddr non secure registers accordingly */

	mmio_setbits_32(CCU_REG(DMI0_DMIUSMCTCR),
	CCU_DMI_ALLOCEN \| CCU_DMI_LOOKUPEN);
	mmio_setbits_32(CCU_REG(DMI1_DMIUSMCTCR),
	CCU_DMI_ALLOCEN \| CCU_DMI_LOOKUPEN);

	/* TODO: To add in CCU NCORE OCRAM bypass mask for non secure registers */
	NOTICE("DDR non secure configured\n");
	}

	void ddr_enable_firewall(void)
	{
	/* Please set the ddr firewall registers accordingly */
	/* TODO: To add in CCU NCORE OCRAM bypass mask for firewall registers */
	NOTICE("DDR firewall enabled\n");
	}

	bool is_ddr_init_in_progress(void)
	{
	uint32_t reg = mmio_read_32(SOCFPGA_SYSMGR(BOOT_SCRATCH_POR_0));

	if (reg & SOCFPGA_SYSMGR_BOOT_SCRATCH_POR_0_MASK) {
	return true;
	}
	return false;
	}

	int ddr_init(void)
	{
	// DDR driver initialization
	int status = -EPERM;
	uint32_t cmd_opcode = 0;

	// Check and set Boot Scratch Register
	if (is_ddr_init_in_progress()) {
	return status;
	}
	mmio_write_32(SOCFPGA_SYSMGR(BOOT_SCRATCH_POR_0), 0x01);

	// Populate DDR handoff data
	handoff reverse_handoff_ptr;

	if (!socfpga_get_handoff(&reverse_handoff_ptr)) {
	assert(status);
	}
	status = ddr_config_handoff(&reverse_handoff_ptr);
	if (status == -EPERM) {
	assert(status);
	}

	// CCU and firewall setup
	ddr_enable_ns_access();
	ddr_enable_firewall();

	// DDR calibration check
	status = ddr_calibration_check();
	if (status == -EPERM) {
	assert(status);
	}

	// DDR mailbox command
	status = ddr_iossm_mailbox_cmd(cmd_opcode);
	if (status != 0) {
	assert(status);
	}

	// Check and set Boot Scratch Register
	mmio_write_32(SOCFPGA_SYSMGR(BOOT_SCRATCH_POR_0), 0x00);

	NOTICE("DDR init successfully\n");
	return status;
	}