drivers/memc/memc_mcux_flexspi.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright 2020-2023 NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT	nxp_imx_flexspi

 #include <zephyr/logging/log.h>
 #include <zephyr/sys/util.h>
 #include <zephyr/drivers/pinctrl.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/pm/device.h>
 #include <soc.h>

 #include "memc_mcux_flexspi.h"


 /*
  * NOTE: If CONFIG_FLASH_MCUX_FLEXSPI_XIP is selected, Any external functions
  * called while interacting with the flexspi MUST be relocated to SRAM or ITCM
  * at runtime, so that the chip does not access the flexspi to read program
  * instructions while it is being written to
  */
 #if defined(CONFIG_FLASH_MCUX_FLEXSPI_XIP) && (CONFIG_MEMC_LOG_LEVEL > 0)
 #warning "Enabling memc driver logging and XIP mode simultaneously can cause \
 	read-while-write hazards. This configuration is not recommended."
 #endif

 #define FLEXSPI_MAX_LUT 64U

 LOG_MODULE_REGISTER(memc_flexspi, CONFIG_MEMC_LOG_LEVEL);

 struct memc_flexspi_buf_cfg {
 	uint16_t prefetch;
 	uint16_t priority;
 	uint16_t master_id;
 	uint16_t buf_size;
 } __packed;

 /* Structure tracking LUT offset and usage per each port */
 struct port_lut {
 	uint8_t lut_offset;
 	uint8_t lut_used;
 };

 /* flexspi device data should be stored in RAM to avoid read-while-write hazards */
 struct memc_flexspi_data {
 	FLEXSPI_Type *base;
 	uint8_t *ahb_base;
 	bool xip;
 	bool ahb_bufferable;
 	bool ahb_cacheable;
 	bool ahb_prefetch;
 	bool ahb_read_addr_opt;
 	bool combination_mode;
 	bool sck_differential_clock;
 	flexspi_read_sample_clock_t rx_sample_clock;
 	const struct pinctrl_dev_config *pincfg;
 	size_t size[kFLEXSPI_PortCount];
 	struct port_lut port_luts[kFLEXSPI_PortCount];
 	struct memc_flexspi_buf_cfg *buf_cfg;
 	uint8_t buf_cfg_cnt;
 	const struct device *clock_dev;
 	clock_control_subsys_t clock_subsys;
 };

 void memc_flexspi_wait_bus_idle(const struct device *dev)
 {
 	struct memc_flexspi_data *data = dev->data;

 	while (false == FLEXSPI_GetBusIdleStatus(data->base)) {
 	}
 }

 bool memc_flexspi_is_running_xip(const struct device *dev)
 {
 	struct memc_flexspi_data *data = dev->data;

 	return data->xip;
 }

 int memc_flexspi_update_clock(const struct device *dev,
 		flexspi_device_config_t *device_config,
 		flexspi_port_t port, uint32_t freq_hz)
 {
 	struct memc_flexspi_data *data = dev->data;
 	uint32_t rate;
 	uint32_t key;
 	int ret;

 	/* To reclock the FlexSPI, we should:
 	 * - disable the module
 	 * - set the new clock
 	 * - reenable the module
 	 * - reset the module
 	 * We CANNOT XIP at any point during this process
 	 */
 	key = irq_lock();
 	memc_flexspi_wait_bus_idle(dev);

 	ret = clock_control_set_rate(data->clock_dev, data->clock_subsys,
 				(clock_control_subsys_rate_t)freq_hz);
 	if (ret < 0) {
 		irq_unlock(key);
 		return ret;
 	}

 	/*
 	 * We need to update the DLL value before we call clock_control_get_rate,
 	 * because this will cause XIP (flash reads) to occur. Although the
 	 * true flash clock is not known, assume the set_rate function programmed
 	 * a value close to what we requested.
 	 */
 	device_config->flexspiRootClk = freq_hz;
 	FLEXSPI_UpdateDllValue(data->base, device_config, port);
 	memc_flexspi_reset(dev);

 	memc_flexspi_wait_bus_idle(dev);
 	ret = clock_control_get_rate(data->clock_dev, data->clock_subsys, &rate);
 	if (ret < 0) {
 		irq_unlock(key);
 		return ret;
 	}


 	device_config->flexspiRootClk = rate;
 	FLEXSPI_UpdateDllValue(data->base, device_config, port);

 	memc_flexspi_reset(dev);

 	irq_unlock(key);

 	return 0;
 }

 int memc_flexspi_set_device_config(const struct device *dev,
 		const flexspi_device_config_t *device_config,
 		const uint32_t *lut_array,
 		uint8_t lut_count,
 		flexspi_port_t port)
 {
 	flexspi_device_config_t tmp_config;
 	uint32_t tmp_lut[FLEXSPI_MAX_LUT];
 	struct memc_flexspi_data *data = dev->data;
 	const uint32_t *lut_ptr = lut_array;
 	uint8_t lut_used = 0U;
 	unsigned int key = 0;

 	if (port >= kFLEXSPI_PortCount) {
 		LOG_ERR("Invalid port number");
 		return -EINVAL;
 	}

 	if (data->port_luts[port].lut_used < lut_count) {
 		/* We cannot reuse the existing LUT slot,
 		 * Check if the LUT table will fit into the remaining LUT slots
 		 */
 		for (uint8_t i = 0; i < kFLEXSPI_PortCount; i++) {
 			lut_used += data->port_luts[i].lut_used;
 		}

 		if ((lut_used + lut_count) > FLEXSPI_MAX_LUT) {
 			return -ENOBUFS;
 		}
 	}

 	data->size[port] = device_config->flashSize * KB(1);

 	if (memc_flexspi_is_running_xip(dev)) {
 		/* We need to avoid flash access while configuring the FlexSPI.
 		 * To do this, we will copy the LUT array into stack-allocated
 		 * temporary memory
 		 */
 		memcpy(tmp_lut, lut_array, lut_count * MEMC_FLEXSPI_CMD_SIZE);
 		lut_ptr = tmp_lut;
 	}

 	memcpy(&tmp_config, device_config, sizeof(tmp_config));
 	/* Update FlexSPI AWRSEQID and ARDSEQID values based on where the LUT
 	 * array will actually be loaded.
 	 */
 	if (data->port_luts[port].lut_used < lut_count) {
 		/* Update lut offset with new value */
 		data->port_luts[port].lut_offset = lut_used;
 	}
 	data->port_luts[port].lut_used = lut_count;
 	tmp_config.ARDSeqIndex += data->port_luts[port].lut_offset;
 	tmp_config.AWRSeqIndex += data->port_luts[port].lut_offset;

 	/* Lock IRQs before reconfiguring FlexSPI, to prevent XIP */
 	key = irq_lock();

 	FLEXSPI_SetFlashConfig(data->base, &tmp_config, port);
 	FLEXSPI_UpdateLUT(data->base, data->port_luts[port].lut_offset,
 			  lut_ptr, lut_count);
 	irq_unlock(key);

 	return 0;
 }

 int memc_flexspi_reset(const struct device *dev)
 {
 	struct memc_flexspi_data *data = dev->data;

 	FLEXSPI_SoftwareReset(data->base);

 	return 0;
 }

 int memc_flexspi_transfer(const struct device *dev,
 		flexspi_transfer_t *transfer)
 {
 	struct memc_flexspi_data *data = dev->data;
 	status_t status;

 	/* Adjust transfer LUT index based on port */
 	transfer->seqIndex += data->port_luts[transfer->port].lut_offset;
 	status = FLEXSPI_TransferBlocking(data->base, transfer);

 	if (status != kStatus_Success) {
 		LOG_ERR("Transfer error: %d", status);
 		return -EIO;
 	}

 	return 0;
 }

 void *memc_flexspi_get_ahb_address(const struct device *dev,
 		flexspi_port_t port, off_t offset)
 {
 	struct memc_flexspi_data *data = dev->data;
 	int i;

 	if (port >= kFLEXSPI_PortCount) {
 		LOG_ERR("Invalid port number: %u", port);
 		return NULL;
 	}

 	for (i = 0; i < port; i++) {
 		offset += data->size[i];
 	}

 	return data->ahb_base + offset;
 }

 static int memc_flexspi_init(const struct device *dev)
 {
 	struct memc_flexspi_data *data = dev->data;
 	flexspi_config_t flexspi_config;

 	/* we should not configure the device we are running on */
 	if (memc_flexspi_is_running_xip(dev)) {
 		LOG_DBG("XIP active on %s, skipping init", dev->name);
 		return 0;
 	}

 	/*
 	 * SOCs such as the RT1064 and RT1024 have internal flash, and no pinmux
 	 * settings, continue if no pinctrl state found.
 	 */
 	int ret;

 	ret = pinctrl_apply_state(data->pincfg, PINCTRL_STATE_DEFAULT);
 	if (ret < 0 && ret != -ENOENT) {
 		return ret;
 	}

 	FLEXSPI_GetDefaultConfig(&flexspi_config);

 	flexspi_config.ahbConfig.enableAHBBufferable = data->ahb_bufferable;
 	flexspi_config.ahbConfig.enableAHBCachable = data->ahb_cacheable;
 	flexspi_config.ahbConfig.enableAHBPrefetch = data->ahb_prefetch;
 	flexspi_config.ahbConfig.enableReadAddressOpt = data->ahb_read_addr_opt;
 #if !(defined(FSL_FEATURE_FLEXSPI_HAS_NO_MCR0_COMBINATIONEN) && \
 	FSL_FEATURE_FLEXSPI_HAS_NO_MCR0_COMBINATIONEN)
 	flexspi_config.enableCombination = data->combination_mode;
 #endif

 #if !(defined(FSL_FEATURE_FLEXSPI_HAS_NO_MCR2_SCKBDIFFOPT) && \
 	FSL_FEATURE_FLEXSPI_HAS_NO_MCR2_SCKBDIFFOPT)
 	flexspi_config.enableSckBDiffOpt = data->sck_differential_clock;
 #endif
 	flexspi_config.rxSampleClock = data->rx_sample_clock;

 	/* Configure AHB RX buffers, if any configuration settings are present */
 	__ASSERT(data->buf_cfg_cnt < FSL_FEATURE_FLEXSPI_AHB_BUFFER_COUNT,
 		"Maximum RX buffer configuration count exceeded");
 	for (uint8_t i = 0; i < data->buf_cfg_cnt; i++) {
 		/* Should AHB prefetch up to buffer size? */
 		flexspi_config.ahbConfig.buffer[i].enablePrefetch = data->buf_cfg[i].prefetch;
 		/* AHB access priority (used for suspending control of AHB prefetching )*/
 		flexspi_config.ahbConfig.buffer[i].priority = data->buf_cfg[i].priority;
 		/* AHB master index, SOC specific */
 		flexspi_config.ahbConfig.buffer[i].masterIndex = data->buf_cfg[i].master_id;
 		/* RX buffer allocation (total available buffer space is instance/SOC specific) */
 		flexspi_config.ahbConfig.buffer[i].bufferSize = data->buf_cfg[i].buf_size;
 	}

 	FLEXSPI_Init(data->base, &flexspi_config);

 	return 0;
 }

 #ifdef CONFIG_PM_DEVICE
 static int memc_flexspi_pm_action(const struct device *dev, enum pm_device_action action)
 {
 	struct memc_flexspi_data *data = dev->data;
 	int ret;

 	switch (action) {
 	case PM_DEVICE_ACTION_RESUME:
 		ret = pinctrl_apply_state(data->pincfg, PINCTRL_STATE_DEFAULT);
 		if (ret < 0 && ret != -ENOENT) {
 			return ret;
 		}
 		break;
 	case PM_DEVICE_ACTION_SUSPEND:
 		ret = pinctrl_apply_state(data->pincfg, PINCTRL_STATE_SLEEP);
 		if (ret < 0 && ret != -ENOENT) {
 			return ret;
 		}
 		break;
 	default:
 		return -ENOTSUP;
 	}

 	return 0;
 }
 #endif

 #if defined(CONFIG_XIP) && defined(CONFIG_FLASH_MCUX_FLEXSPI_XIP)
 /* Checks if image flash base address is in the FlexSPI AHB base region */
 #define MEMC_FLEXSPI_CFG_XIP(node_id)						\
 	((CONFIG_FLASH_BASE_ADDRESS) >= DT_REG_ADDR_BY_IDX(node_id, 1)) &&	\
 	((CONFIG_FLASH_BASE_ADDRESS) < (DT_REG_ADDR_BY_IDX(node_id, 1) +	\
 					DT_REG_SIZE_BY_IDX(node_id, 1)))

 #else
 #define MEMC_FLEXSPI_CFG_XIP(node_id) false
 #endif

 #define MEMC_FLEXSPI(n)							\
 	PINCTRL_DT_INST_DEFINE(n);					\
 	static uint16_t  buf_cfg_##n[] =				\
 		DT_INST_PROP_OR(n, rx_buffer_config, {0});		\
 									\
 	static struct memc_flexspi_data					\
 		memc_flexspi_data_##n = {				\
 		.base = (FLEXSPI_Type *) DT_INST_REG_ADDR(n),		\
 		.xip = MEMC_FLEXSPI_CFG_XIP(DT_DRV_INST(n)),		\
 		.ahb_base = (uint8_t *) DT_INST_REG_ADDR_BY_IDX(n, 1),	\
 		.ahb_bufferable = DT_INST_PROP(n, ahb_bufferable),	\
 		.ahb_cacheable = DT_INST_PROP(n, ahb_cacheable),	\
 		.ahb_prefetch = DT_INST_PROP(n, ahb_prefetch),		\
 		.ahb_read_addr_opt = DT_INST_PROP(n, ahb_read_addr_opt),\
 		.combination_mode = DT_INST_PROP(n, combination_mode),	\
 		.sck_differential_clock = DT_INST_PROP(n, sck_differential_clock),	\
 		.rx_sample_clock = DT_INST_PROP(n, rx_clock_source),	\
 		.buf_cfg = (struct memc_flexspi_buf_cfg *)buf_cfg_##n,	\
 		.buf_cfg_cnt = sizeof(buf_cfg_##n) /			\
 			sizeof(struct memc_flexspi_buf_cfg),		\
 		.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),		\
 		.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)),     \
 		.clock_subsys = (clock_control_subsys_t)                \
 			DT_INST_CLOCKS_CELL(n, name),                   \
 	};								\
 									\
 	PM_DEVICE_DT_INST_DEFINE(n, memc_flexspi_pm_action);		\
 									\
 	DEVICE_DT_INST_DEFINE(n,					\
 			      memc_flexspi_init,			\
 			      PM_DEVICE_DT_INST_GET(n),			\
 			      &memc_flexspi_data_##n,			\
 			      NULL,					\
 			      POST_KERNEL,				\
 			      CONFIG_MEMC_INIT_PRIORITY,	\
 			      NULL);

 DT_INST_FOREACH_STATUS_OKAY(MEMC_FLEXSPI)
	/*
	* Copyright 2020-2023 NXP
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nxp_imx_flexspi

	#include <zephyr/logging/log.h>
	#include <zephyr/sys/util.h>
	#include <zephyr/drivers/pinctrl.h>
	#include <zephyr/drivers/clock_control.h>
	#include <zephyr/pm/device.h>
	#include <soc.h>

	#include "memc_mcux_flexspi.h"


	/*
	* NOTE: If CONFIG_FLASH_MCUX_FLEXSPI_XIP is selected, Any external functions
	* called while interacting with the flexspi MUST be relocated to SRAM or ITCM
	* at runtime, so that the chip does not access the flexspi to read program
	* instructions while it is being written to
	*/
	#if defined(CONFIG_FLASH_MCUX_FLEXSPI_XIP) && (CONFIG_MEMC_LOG_LEVEL > 0)
	#warning "Enabling memc driver logging and XIP mode simultaneously can cause \
	read-while-write hazards. This configuration is not recommended."
	#endif

	#define FLEXSPI_MAX_LUT 64U

	LOG_MODULE_REGISTER(memc_flexspi, CONFIG_MEMC_LOG_LEVEL);

	struct memc_flexspi_buf_cfg {
	uint16_t prefetch;
	uint16_t priority;
	uint16_t master_id;
	uint16_t buf_size;
	} __packed;

	/* Structure tracking LUT offset and usage per each port */
	struct port_lut {
	uint8_t lut_offset;
	uint8_t lut_used;
	};

	/* flexspi device data should be stored in RAM to avoid read-while-write hazards */
	struct memc_flexspi_data {
	FLEXSPI_Type *base;
	uint8_t *ahb_base;
	bool xip;
	bool ahb_bufferable;
	bool ahb_cacheable;
	bool ahb_prefetch;
	bool ahb_read_addr_opt;
	bool combination_mode;
	bool sck_differential_clock;
	flexspi_read_sample_clock_t rx_sample_clock;
	const struct pinctrl_dev_config *pincfg;
	size_t size[kFLEXSPI_PortCount];
	struct port_lut port_luts[kFLEXSPI_PortCount];
	struct memc_flexspi_buf_cfg *buf_cfg;
	uint8_t buf_cfg_cnt;
	const struct device *clock_dev;
	clock_control_subsys_t clock_subsys;
	};

	void memc_flexspi_wait_bus_idle(const struct device *dev)
	{
	struct memc_flexspi_data *data = dev->data;

	while (false == FLEXSPI_GetBusIdleStatus(data->base)) {
	}
	}

	bool memc_flexspi_is_running_xip(const struct device *dev)
	{
	struct memc_flexspi_data *data = dev->data;

	return data->xip;
	}

	int memc_flexspi_update_clock(const struct device *dev,
	flexspi_device_config_t *device_config,
	flexspi_port_t port, uint32_t freq_hz)
	{
	struct memc_flexspi_data *data = dev->data;
	uint32_t rate;
	uint32_t key;
	int ret;

	/* To reclock the FlexSPI, we should:
	* - disable the module
	* - set the new clock
	* - reenable the module
	* - reset the module
	* We CANNOT XIP at any point during this process
	*/
	key = irq_lock();
	memc_flexspi_wait_bus_idle(dev);

	ret = clock_control_set_rate(data->clock_dev, data->clock_subsys,
	(clock_control_subsys_rate_t)freq_hz);
	if (ret < 0) {
	irq_unlock(key);
	return ret;
	}

	/*
	* We need to update the DLL value before we call clock_control_get_rate,
	* because this will cause XIP (flash reads) to occur. Although the
	* true flash clock is not known, assume the set_rate function programmed
	* a value close to what we requested.
	*/
	device_config->flexspiRootClk = freq_hz;
	FLEXSPI_UpdateDllValue(data->base, device_config, port);
	memc_flexspi_reset(dev);

	memc_flexspi_wait_bus_idle(dev);
	ret = clock_control_get_rate(data->clock_dev, data->clock_subsys, &rate);
	if (ret < 0) {
	irq_unlock(key);
	return ret;
	}


	device_config->flexspiRootClk = rate;
	FLEXSPI_UpdateDllValue(data->base, device_config, port);

	memc_flexspi_reset(dev);

	irq_unlock(key);

	return 0;
	}

	int memc_flexspi_set_device_config(const struct device *dev,
	const flexspi_device_config_t *device_config,
	const uint32_t *lut_array,
	uint8_t lut_count,
	flexspi_port_t port)
	{
	flexspi_device_config_t tmp_config;
	uint32_t tmp_lut[FLEXSPI_MAX_LUT];
	struct memc_flexspi_data *data = dev->data;
	const uint32_t *lut_ptr = lut_array;
	uint8_t lut_used = 0U;
	unsigned int key = 0;

	if (port >= kFLEXSPI_PortCount) {
	LOG_ERR("Invalid port number");
	return -EINVAL;
	}

	if (data->port_luts[port].lut_used < lut_count) {
	/* We cannot reuse the existing LUT slot,
	* Check if the LUT table will fit into the remaining LUT slots
	*/
	for (uint8_t i = 0; i < kFLEXSPI_PortCount; i++) {
	lut_used += data->port_luts[i].lut_used;
	}

	if ((lut_used + lut_count) > FLEXSPI_MAX_LUT) {
	return -ENOBUFS;
	}
	}

	data->size[port] = device_config->flashSize * KB(1);

	if (memc_flexspi_is_running_xip(dev)) {
	/* We need to avoid flash access while configuring the FlexSPI.
	* To do this, we will copy the LUT array into stack-allocated
	* temporary memory
	*/
	memcpy(tmp_lut, lut_array, lut_count * MEMC_FLEXSPI_CMD_SIZE);
	lut_ptr = tmp_lut;
	}

	memcpy(&tmp_config, device_config, sizeof(tmp_config));
	/* Update FlexSPI AWRSEQID and ARDSEQID values based on where the LUT
	* array will actually be loaded.
	*/
	if (data->port_luts[port].lut_used < lut_count) {
	/* Update lut offset with new value */
	data->port_luts[port].lut_offset = lut_used;
	}
	data->port_luts[port].lut_used = lut_count;
	tmp_config.ARDSeqIndex += data->port_luts[port].lut_offset;
	tmp_config.AWRSeqIndex += data->port_luts[port].lut_offset;

	/* Lock IRQs before reconfiguring FlexSPI, to prevent XIP */
	key = irq_lock();

	FLEXSPI_SetFlashConfig(data->base, &tmp_config, port);
	FLEXSPI_UpdateLUT(data->base, data->port_luts[port].lut_offset,
	lut_ptr, lut_count);
	irq_unlock(key);

	return 0;
	}

	int memc_flexspi_reset(const struct device *dev)
	{
	struct memc_flexspi_data *data = dev->data;

	FLEXSPI_SoftwareReset(data->base);

	return 0;
	}

	int memc_flexspi_transfer(const struct device *dev,
	flexspi_transfer_t *transfer)
	{
	struct memc_flexspi_data *data = dev->data;
	status_t status;

	/* Adjust transfer LUT index based on port */
	transfer->seqIndex += data->port_luts[transfer->port].lut_offset;
	status = FLEXSPI_TransferBlocking(data->base, transfer);

	if (status != kStatus_Success) {
	LOG_ERR("Transfer error: %d", status);
	return -EIO;
	}

	return 0;
	}

	void memc_flexspi_get_ahb_address(const struct device dev,
	flexspi_port_t port, off_t offset)
	{
	struct memc_flexspi_data *data = dev->data;
	int i;

	if (port >= kFLEXSPI_PortCount) {
	LOG_ERR("Invalid port number: %u", port);
	return NULL;
	}

	for (i = 0; i < port; i++) {
	offset += data->size[i];
	}

	return data->ahb_base + offset;
	}

	static int memc_flexspi_init(const struct device *dev)
	{
	struct memc_flexspi_data *data = dev->data;
	flexspi_config_t flexspi_config;

	/* we should not configure the device we are running on */
	if (memc_flexspi_is_running_xip(dev)) {
	LOG_DBG("XIP active on %s, skipping init", dev->name);
	return 0;
	}

	/*
	* SOCs such as the RT1064 and RT1024 have internal flash, and no pinmux
	* settings, continue if no pinctrl state found.
	*/
	int ret;

	ret = pinctrl_apply_state(data->pincfg, PINCTRL_STATE_DEFAULT);
	if (ret < 0 && ret != -ENOENT) {
	return ret;
	}

	FLEXSPI_GetDefaultConfig(&flexspi_config);

	flexspi_config.ahbConfig.enableAHBBufferable = data->ahb_bufferable;
	flexspi_config.ahbConfig.enableAHBCachable = data->ahb_cacheable;
	flexspi_config.ahbConfig.enableAHBPrefetch = data->ahb_prefetch;
	flexspi_config.ahbConfig.enableReadAddressOpt = data->ahb_read_addr_opt;
	#if !(defined(FSL_FEATURE_FLEXSPI_HAS_NO_MCR0_COMBINATIONEN) && \
	FSL_FEATURE_FLEXSPI_HAS_NO_MCR0_COMBINATIONEN)
	flexspi_config.enableCombination = data->combination_mode;
	#endif

	#if !(defined(FSL_FEATURE_FLEXSPI_HAS_NO_MCR2_SCKBDIFFOPT) && \
	FSL_FEATURE_FLEXSPI_HAS_NO_MCR2_SCKBDIFFOPT)
	flexspi_config.enableSckBDiffOpt = data->sck_differential_clock;
	#endif
	flexspi_config.rxSampleClock = data->rx_sample_clock;

	/* Configure AHB RX buffers, if any configuration settings are present */
	__ASSERT(data->buf_cfg_cnt < FSL_FEATURE_FLEXSPI_AHB_BUFFER_COUNT,
	"Maximum RX buffer configuration count exceeded");
	for (uint8_t i = 0; i < data->buf_cfg_cnt; i++) {
	/* Should AHB prefetch up to buffer size? */
	flexspi_config.ahbConfig.buffer[i].enablePrefetch = data->buf_cfg[i].prefetch;
	/* AHB access priority (used for suspending control of AHB prefetching )*/
	flexspi_config.ahbConfig.buffer[i].priority = data->buf_cfg[i].priority;
	/* AHB master index, SOC specific */
	flexspi_config.ahbConfig.buffer[i].masterIndex = data->buf_cfg[i].master_id;
	/* RX buffer allocation (total available buffer space is instance/SOC specific) */
	flexspi_config.ahbConfig.buffer[i].bufferSize = data->buf_cfg[i].buf_size;
	}

	FLEXSPI_Init(data->base, &flexspi_config);

	return 0;
	}

	#ifdef CONFIG_PM_DEVICE
	static int memc_flexspi_pm_action(const struct device *dev, enum pm_device_action action)
	{
	struct memc_flexspi_data *data = dev->data;
	int ret;

	switch (action) {
	case PM_DEVICE_ACTION_RESUME:
	ret = pinctrl_apply_state(data->pincfg, PINCTRL_STATE_DEFAULT);
	if (ret < 0 && ret != -ENOENT) {
	return ret;
	}
	break;
	case PM_DEVICE_ACTION_SUSPEND:
	ret = pinctrl_apply_state(data->pincfg, PINCTRL_STATE_SLEEP);
	if (ret < 0 && ret != -ENOENT) {
	return ret;
	}
	break;
	default:
	return -ENOTSUP;
	}

	return 0;
	}
	#endif

	#if defined(CONFIG_XIP) && defined(CONFIG_FLASH_MCUX_FLEXSPI_XIP)
	/* Checks if image flash base address is in the FlexSPI AHB base region */
	#define MEMC_FLEXSPI_CFG_XIP(node_id) \
	((CONFIG_FLASH_BASE_ADDRESS) >= DT_REG_ADDR_BY_IDX(node_id, 1)) && \
	((CONFIG_FLASH_BASE_ADDRESS) < (DT_REG_ADDR_BY_IDX(node_id, 1) + \
	DT_REG_SIZE_BY_IDX(node_id, 1)))

	#else
	#define MEMC_FLEXSPI_CFG_XIP(node_id) false
	#endif

	#define MEMC_FLEXSPI(n) \
	PINCTRL_DT_INST_DEFINE(n); \
	static uint16_t buf_cfg_##n[] = \
	DT_INST_PROP_OR(n, rx_buffer_config, {0}); \
	\
	static struct memc_flexspi_data \
	memc_flexspi_data_##n = { \
	.base = (FLEXSPI_Type *) DT_INST_REG_ADDR(n), \
	.xip = MEMC_FLEXSPI_CFG_XIP(DT_DRV_INST(n)), \
	.ahb_base = (uint8_t *) DT_INST_REG_ADDR_BY_IDX(n, 1), \
	.ahb_bufferable = DT_INST_PROP(n, ahb_bufferable), \
	.ahb_cacheable = DT_INST_PROP(n, ahb_cacheable), \
	.ahb_prefetch = DT_INST_PROP(n, ahb_prefetch), \
	.ahb_read_addr_opt = DT_INST_PROP(n, ahb_read_addr_opt),\
	.combination_mode = DT_INST_PROP(n, combination_mode), \
	.sck_differential_clock = DT_INST_PROP(n, sck_differential_clock), \
	.rx_sample_clock = DT_INST_PROP(n, rx_clock_source), \
	.buf_cfg = (struct memc_flexspi_buf_cfg *)buf_cfg_##n, \
	.buf_cfg_cnt = sizeof(buf_cfg_##n) / \
	sizeof(struct memc_flexspi_buf_cfg), \
	.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
	.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
	.clock_subsys = (clock_control_subsys_t) \
	DT_INST_CLOCKS_CELL(n, name), \
	}; \
	\
	PM_DEVICE_DT_INST_DEFINE(n, memc_flexspi_pm_action); \
	\
	DEVICE_DT_INST_DEFINE(n, \
	memc_flexspi_init, \
	PM_DEVICE_DT_INST_GET(n), \
	&memc_flexspi_data_##n, \
	NULL, \
	POST_KERNEL, \
	CONFIG_MEMC_INIT_PRIORITY, \
	NULL);

	DT_INST_FOREACH_STATUS_OKAY(MEMC_FLEXSPI)