drivers/flash/soc_flash_nrf_rram.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2024 Nordic Semiconductor ASA
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT nordic_rram_controller

 #include <string.h>
 #include <zephyr/kernel.h>
 #include <zephyr/device.h>
 #include <zephyr/drivers/flash.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>
 #include <zephyr/sys/barrier.h>
 #include <hal/nrf_rramc.h>

 #include <zephyr/../../drivers/flash/soc_flash_nrf.h>

 /* Note that it is supported to compile this driver for both secure
  * and non-secure images, but non-secure images cannot call
  * nrf_rramc_config_set because NRF_RRAMC_NS does not exist.
  *
  * Instead, when TF-M boots, it will configure RRAMC with this static
  * configuration:
  *
  * nrf_rramc_config_t config = {
  *   .mode_write = true,
  *   .write_buff_size = WRITE_BUFFER_SIZE
  * };
  *
  * nrf_rramc_ready_next_timeout_t params = {
  *   .value = CONFIG_NRF_RRAM_READYNEXT_TIMEOUT_VALUE,
  *   .enable = true,
  * };
  *
  * For more details see NCSDK-26982.
  */

 LOG_MODULE_REGISTER(flash_nrf_rram, CONFIG_FLASH_LOG_LEVEL);

 #define RRAM DT_INST(0, soc_nv_flash)

 #if defined(CONFIG_SOC_SERIES_BSIM_NRFXX)
 #define RRAM_START NRF_RRAM_BASE_ADDR
 #else
 #define RRAM_START DT_REG_ADDR(RRAM)
 #endif
 #define RRAM_SIZE  DT_REG_SIZE(RRAM)

 #define PAGE_SIZE  DT_PROP(RRAM, erase_block_size)
 #define PAGE_COUNT ((RRAM_SIZE) / (PAGE_SIZE))

 #define WRITE_BLOCK_SIZE_FROM_DT DT_PROP(RRAM, write_block_size)
 #define ERASE_VALUE              0xFF

 #ifdef CONFIG_MULTITHREADING
 static struct k_sem sem_lock;
 #define SYNC_INIT()   k_sem_init(&sem_lock, 1, 1)
 #define SYNC_LOCK()   k_sem_take(&sem_lock, K_FOREVER)
 #define SYNC_UNLOCK() k_sem_give(&sem_lock)
 #else
 #define SYNC_INIT()
 #define SYNC_LOCK()
 #define SYNC_UNLOCK()
 #endif /* CONFIG_MULTITHREADING */

 #if CONFIG_NRF_RRAM_WRITE_BUFFER_SIZE > 0
 #define WRITE_BUFFER_ENABLE   1
 #define WRITE_BUFFER_SIZE     CONFIG_NRF_RRAM_WRITE_BUFFER_SIZE
 #define WRITE_LINE_SIZE       16 /* In bytes, one line is 128 bits. */
 #define WRITE_BUFFER_MAX_SIZE (WRITE_BUFFER_SIZE * WRITE_LINE_SIZE)
 BUILD_ASSERT((PAGE_SIZE % (WRITE_LINE_SIZE) == 0), "erase-block-size must be a multiple of 16");
 BUILD_ASSERT((WRITE_BLOCK_SIZE_FROM_DT % (WRITE_LINE_SIZE) == 0),
 	     "if NRF_RRAM_WRITE_BUFFER_SIZE > 0, then write-block-size must be a multiple of 16");
 #else
 #define WRITE_BUFFER_ENABLE   0
 #define WRITE_BUFFER_SIZE     0
 #define WRITE_LINE_SIZE       WRITE_BLOCK_SIZE_FROM_DT
 #define WRITE_BUFFER_MAX_SIZE 16 /* In bytes, one line is 128 bits. */
 BUILD_ASSERT((PAGE_SIZE % (WRITE_LINE_SIZE) == 0),
 	     "erase-block-size must be a multiple of write-block-size");
 #endif

 #ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE

 #if (WRITE_BUFFER_SIZE < 2)
 #define FLASH_SLOT_WRITE 500
 #elif (WRITE_BUFFER_SIZE < 4)
 #define FLASH_SLOT_WRITE 1000
 #elif (WRITE_BUFFER_SIZE < 9)
 #define FLASH_SLOT_WRITE 2000
 #elif (WRITE_BUFFER_SIZE < 17)
 #define FLASH_SLOT_WRITE 4000
 #else
 #define FLASH_SLOT_WRITE 8000 /* longest write takes 7107 us */
 #endif

 static int write_op(void *context); /* instance of flash_op_handler_t */
 static int write_synchronously(off_t addr, const void *data, size_t len);

 #endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */

 static inline bool is_within_bounds(off_t addr, size_t len, off_t boundary_start,
 				    size_t boundary_size)
 {
 	return (addr >= boundary_start && (addr < (boundary_start + boundary_size)) &&
 		(len <= (boundary_start + boundary_size - addr)));
 }

 #if WRITE_BUFFER_ENABLE
 static void commit_changes(off_t addr, size_t len)
 {
 #if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
 	if (nrf_rramc_empty_buffer_check(NRF_RRAMC)) {
 		/* The internal write-buffer has been committed to RRAM and is now empty. */
 		return;
 	}
 #endif

 	if ((len % (WRITE_BUFFER_MAX_SIZE)) == 0) {
 		/* Our last operation was buffer size-aligned, so we're done. */
 		return;
 	}

 #if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
 	ARG_UNUSED(addr);

 	nrf_rramc_task_trigger(NRF_RRAMC, NRF_RRAMC_TASK_COMMIT_WRITEBUF);
 #else
 	/*
 	 * When the commit task is unavailable we need to get creative to
 	 * ensure this is committed.
 	 *
 	 * According to the PS the buffer is committed when "There is a
 	 * read operation from a 128-bit word line in the buffer that has
 	 * already been written to".
 	 *
 	 * So we read the last byte that has been written to trigger this
 	 * commit.
 	 *
 	 * If this approach proves to be problematic, e.g. for writes to
 	 * write-only memory, then one would have to rely on
 	 * READYNEXTTIMEOUT to eventually commit the write.
 	 */
 	volatile uint8_t dummy_read = *(volatile uint8_t *)(addr + len - 1);
 	ARG_UNUSED(dummy_read);
 #endif

 	barrier_dmem_fence_full();
 }
 #endif

 static void rram_write(off_t addr, const void *data, size_t len)
 {
 #if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
 	nrf_rramc_config_t config = {.mode_write = true, .write_buff_size = WRITE_BUFFER_SIZE};

 	nrf_rramc_config_set(NRF_RRAMC, &config);
 #endif

 	if (data) {
 		memcpy((void *)addr, data, len);
 	} else {
 		memset((void *)addr, ERASE_VALUE, len);
 	}

 	barrier_dmem_fence_full(); /* Barrier following our last write. */

 #if WRITE_BUFFER_ENABLE
 	commit_changes(addr, len);
 #endif

 #if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
 	config.mode_write = false;
 	nrf_rramc_config_set(NRF_RRAMC, &config);
 #endif
 }

 #ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE
 static void shift_write_context(uint32_t shift, struct flash_context *w_ctx)
 {
 	w_ctx->flash_addr += shift;

 	/* NULL data_addr => erase emulation request*/
 	if (w_ctx->data_addr) {
 		w_ctx->data_addr += shift;
 	}

 	w_ctx->len -= shift;
 }

 static int write_op(void *context)
 {
 	struct flash_context *w_ctx = context;
 	size_t len;

 	uint32_t i = 0U;

 	if (w_ctx->enable_time_limit) {
 		nrf_flash_sync_get_timestamp_begin();
 	}

 	while (w_ctx->len > 0) {
 		len = (WRITE_BUFFER_MAX_SIZE < w_ctx->len) ? WRITE_BUFFER_MAX_SIZE : w_ctx->len;

 		rram_write(w_ctx->flash_addr, (const void *)w_ctx->data_addr, len);

 		shift_write_context(len, w_ctx);

 		if (w_ctx->len > 0) {
 			i++;

 			if (w_ctx->enable_time_limit) {
 				if (nrf_flash_sync_check_time_limit(i)) {
 					return FLASH_OP_ONGOING;
 				}
 			}
 		}
 	}

 	return FLASH_OP_DONE;
 }

 static int write_synchronously(off_t addr, const void *data, size_t len)
 {
 	struct flash_context context = {
 		.data_addr = (uint32_t)data,
 		.flash_addr = addr,
 		.len = len,
 		.enable_time_limit = 1 /* enable time limit */
 	};

 	struct flash_op_desc flash_op_desc = {.handler = write_op, .context = &context};

 	nrf_flash_sync_set_context(FLASH_SLOT_WRITE);
 	return nrf_flash_sync_exe(&flash_op_desc);
 }

 #endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */

 static int nrf_write(off_t addr, const void *data, size_t len)
 {
 	int ret = 0;

 	if (!is_within_bounds(addr, len, 0, RRAM_SIZE)) {
 		return -EINVAL;
 	}
 	addr += RRAM_START;

 	if (!len) {
 		return 0;
 	}

 	LOG_DBG("Write: %p:%zu", (void *)addr, len);

 	SYNC_LOCK();

 #ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE
 	if (nrf_flash_sync_is_required()) {
 		ret = write_synchronously(addr, data, len);
 	} else
 #endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */
 	{
 		rram_write(addr, data, len);
 	}

 	SYNC_UNLOCK();

 	return ret;
 }

 static int nrf_rram_read(const struct device *dev, off_t addr, void *data, size_t len)
 {
 	ARG_UNUSED(dev);

 	if (!is_within_bounds(addr, len, 0, RRAM_SIZE)) {
 		return -EINVAL;
 	}
 	addr += RRAM_START;

 	memcpy(data, (void *)addr, len);

 	return 0;
 }

 static int nrf_rram_write(const struct device *dev, off_t addr, const void *data, size_t len)
 {
 	ARG_UNUSED(dev);

 	if (data == NULL) {
 		return -EINVAL;
 	}

 	return nrf_write(addr, data, len);
 }

 static int nrf_rram_erase(const struct device *dev, off_t addr, size_t len)
 {
 	ARG_UNUSED(dev);

 	return nrf_write(addr, NULL, len);
 }

 int nrf_rram_get_size(const struct device *dev, uint64_t *size)
 {
 	ARG_UNUSED(dev);

 	*size = RRAM_SIZE;

 	return 0;
 }

 static const struct flash_parameters *nrf_rram_get_parameters(const struct device *dev)
 {
 	ARG_UNUSED(dev);

 	static const struct flash_parameters parameters = {
 		.write_block_size = WRITE_LINE_SIZE,
 		.erase_value = ERASE_VALUE,
 		.caps = {
 			.no_explicit_erase = true,
 		},
 	};

 	return &parameters;
 }

 #if defined(CONFIG_FLASH_PAGE_LAYOUT)
 static void nrf_rram_page_layout(const struct device *dev, const struct flash_pages_layout **layout,
 				 size_t *layout_size)
 {
 	ARG_UNUSED(dev);

 	static const struct flash_pages_layout pages_layout = {
 		.pages_count = PAGE_COUNT,
 		.pages_size = PAGE_SIZE,
 	};

 	*layout = &pages_layout;
 	*layout_size = 1;
 }
 #endif

 static DEVICE_API(flash, nrf_rram_api) = {
 	.read = nrf_rram_read,
 	.write = nrf_rram_write,
 	.erase = nrf_rram_erase,
 	.get_size = nrf_rram_get_size,
 	.get_parameters = nrf_rram_get_parameters,
 #if defined(CONFIG_FLASH_PAGE_LAYOUT)
 	.page_layout = nrf_rram_page_layout,
 #endif
 };

 static int nrf_rram_init(const struct device *dev)
 {
 	ARG_UNUSED(dev);

 	SYNC_INIT();

 #ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE
 	nrf_flash_sync_init();
 #endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */

 #if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE) && CONFIG_NRF_RRAM_READYNEXT_TIMEOUT_VALUE > 0
 	nrf_rramc_ready_next_timeout_t params = {
 		.value = CONFIG_NRF_RRAM_READYNEXT_TIMEOUT_VALUE,
 		.enable = true,
 	};

 	nrf_rramc_ready_next_timeout_set(NRF_RRAMC, &params);
 #endif

 	return 0;
 }

 DEVICE_DT_INST_DEFINE(0, nrf_rram_init, NULL, NULL, NULL, POST_KERNEL, CONFIG_FLASH_INIT_PRIORITY,
 		      &nrf_rram_api);
	/*
	* Copyright (c) 2024 Nordic Semiconductor ASA
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nordic_rram_controller

	#include <string.h>
	#include <zephyr/kernel.h>
	#include <zephyr/device.h>
	#include <zephyr/drivers/flash.h>
	#include <zephyr/logging/log.h>
	#include <zephyr/irq.h>
	#include <zephyr/sys/barrier.h>
	#include <hal/nrf_rramc.h>

	#include <zephyr/../../drivers/flash/soc_flash_nrf.h>

	/* Note that it is supported to compile this driver for both secure
	* and non-secure images, but non-secure images cannot call
	* nrf_rramc_config_set because NRF_RRAMC_NS does not exist.
	*
	* Instead, when TF-M boots, it will configure RRAMC with this static
	* configuration:
	*
	* nrf_rramc_config_t config = {
	* .mode_write = true,
	* .write_buff_size = WRITE_BUFFER_SIZE
	* };
	*
	* nrf_rramc_ready_next_timeout_t params = {
	* .value = CONFIG_NRF_RRAM_READYNEXT_TIMEOUT_VALUE,
	* .enable = true,
	* };
	*
	* For more details see NCSDK-26982.
	*/

	LOG_MODULE_REGISTER(flash_nrf_rram, CONFIG_FLASH_LOG_LEVEL);

	#define RRAM DT_INST(0, soc_nv_flash)

	#if defined(CONFIG_SOC_SERIES_BSIM_NRFXX)
	#define RRAM_START NRF_RRAM_BASE_ADDR
	#else
	#define RRAM_START DT_REG_ADDR(RRAM)
	#endif
	#define RRAM_SIZE DT_REG_SIZE(RRAM)

	#define PAGE_SIZE DT_PROP(RRAM, erase_block_size)
	#define PAGE_COUNT ((RRAM_SIZE) / (PAGE_SIZE))

	#define WRITE_BLOCK_SIZE_FROM_DT DT_PROP(RRAM, write_block_size)
	#define ERASE_VALUE 0xFF

	#ifdef CONFIG_MULTITHREADING
	static struct k_sem sem_lock;
	#define SYNC_INIT() k_sem_init(&sem_lock, 1, 1)
	#define SYNC_LOCK() k_sem_take(&sem_lock, K_FOREVER)
	#define SYNC_UNLOCK() k_sem_give(&sem_lock)
	#else
	#define SYNC_INIT()
	#define SYNC_LOCK()
	#define SYNC_UNLOCK()
	#endif /* CONFIG_MULTITHREADING */

	#if CONFIG_NRF_RRAM_WRITE_BUFFER_SIZE > 0
	#define WRITE_BUFFER_ENABLE 1
	#define WRITE_BUFFER_SIZE CONFIG_NRF_RRAM_WRITE_BUFFER_SIZE
	#define WRITE_LINE_SIZE 16 /* In bytes, one line is 128 bits. */
	#define WRITE_BUFFER_MAX_SIZE (WRITE_BUFFER_SIZE * WRITE_LINE_SIZE)
	BUILD_ASSERT((PAGE_SIZE % (WRITE_LINE_SIZE) == 0), "erase-block-size must be a multiple of 16");
	BUILD_ASSERT((WRITE_BLOCK_SIZE_FROM_DT % (WRITE_LINE_SIZE) == 0),
	"if NRF_RRAM_WRITE_BUFFER_SIZE > 0, then write-block-size must be a multiple of 16");
	#else
	#define WRITE_BUFFER_ENABLE 0
	#define WRITE_BUFFER_SIZE 0
	#define WRITE_LINE_SIZE WRITE_BLOCK_SIZE_FROM_DT
	#define WRITE_BUFFER_MAX_SIZE 16 /* In bytes, one line is 128 bits. */
	BUILD_ASSERT((PAGE_SIZE % (WRITE_LINE_SIZE) == 0),
	"erase-block-size must be a multiple of write-block-size");
	#endif

	#ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE

	#if (WRITE_BUFFER_SIZE < 2)
	#define FLASH_SLOT_WRITE 500
	#elif (WRITE_BUFFER_SIZE < 4)
	#define FLASH_SLOT_WRITE 1000
	#elif (WRITE_BUFFER_SIZE < 9)
	#define FLASH_SLOT_WRITE 2000
	#elif (WRITE_BUFFER_SIZE < 17)
	#define FLASH_SLOT_WRITE 4000
	#else
	#define FLASH_SLOT_WRITE 8000 /* longest write takes 7107 us */
	#endif

	static int write_op(void context); / instance of flash_op_handler_t */
	static int write_synchronously(off_t addr, const void *data, size_t len);

	#endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */

	static inline bool is_within_bounds(off_t addr, size_t len, off_t boundary_start,
	size_t boundary_size)
	{
	return (addr >= boundary_start && (addr < (boundary_start + boundary_size)) &&
	(len <= (boundary_start + boundary_size - addr)));
	}

	#if WRITE_BUFFER_ENABLE
	static void commit_changes(off_t addr, size_t len)
	{
	#if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
	if (nrf_rramc_empty_buffer_check(NRF_RRAMC)) {
	/* The internal write-buffer has been committed to RRAM and is now empty. */
	return;
	}
	#endif

	if ((len % (WRITE_BUFFER_MAX_SIZE)) == 0) {
	/* Our last operation was buffer size-aligned, so we're done. */
	return;
	}

	#if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
	ARG_UNUSED(addr);

	nrf_rramc_task_trigger(NRF_RRAMC, NRF_RRAMC_TASK_COMMIT_WRITEBUF);
	#else
	/*
	* When the commit task is unavailable we need to get creative to
	* ensure this is committed.
	*
	* According to the PS the buffer is committed when "There is a
	* read operation from a 128-bit word line in the buffer that has
	* already been written to".
	*
	* So we read the last byte that has been written to trigger this
	* commit.
	*
	* If this approach proves to be problematic, e.g. for writes to
	* write-only memory, then one would have to rely on
	* READYNEXTTIMEOUT to eventually commit the write.
	*/
	volatile uint8_t dummy_read = (volatile uint8_t )(addr + len - 1);
	ARG_UNUSED(dummy_read);
	#endif

	barrier_dmem_fence_full();
	}
	#endif

	static void rram_write(off_t addr, const void *data, size_t len)
	{
	#if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
	nrf_rramc_config_t config = {.mode_write = true, .write_buff_size = WRITE_BUFFER_SIZE};

	nrf_rramc_config_set(NRF_RRAMC, &config);
	#endif

	if (data) {
	memcpy((void *)addr, data, len);
	} else {
	memset((void *)addr, ERASE_VALUE, len);
	}

	barrier_dmem_fence_full(); /* Barrier following our last write. */

	#if WRITE_BUFFER_ENABLE
	commit_changes(addr, len);
	#endif

	#if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE)
	config.mode_write = false;
	nrf_rramc_config_set(NRF_RRAMC, &config);
	#endif
	}

	#ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE
	static void shift_write_context(uint32_t shift, struct flash_context *w_ctx)
	{
	w_ctx->flash_addr += shift;

	/* NULL data_addr => erase emulation request*/
	if (w_ctx->data_addr) {
	w_ctx->data_addr += shift;
	}

	w_ctx->len -= shift;
	}

	static int write_op(void *context)
	{
	struct flash_context *w_ctx = context;
	size_t len;

	uint32_t i = 0U;

	if (w_ctx->enable_time_limit) {
	nrf_flash_sync_get_timestamp_begin();
	}

	while (w_ctx->len > 0) {
	len = (WRITE_BUFFER_MAX_SIZE < w_ctx->len) ? WRITE_BUFFER_MAX_SIZE : w_ctx->len;

	rram_write(w_ctx->flash_addr, (const void *)w_ctx->data_addr, len);

	shift_write_context(len, w_ctx);

	if (w_ctx->len > 0) {
	i++;

	if (w_ctx->enable_time_limit) {
	if (nrf_flash_sync_check_time_limit(i)) {
	return FLASH_OP_ONGOING;
	}
	}
	}
	}

	return FLASH_OP_DONE;
	}

	static int write_synchronously(off_t addr, const void *data, size_t len)
	{
	struct flash_context context = {
	.data_addr = (uint32_t)data,
	.flash_addr = addr,
	.len = len,
	.enable_time_limit = 1 /* enable time limit */
	};

	struct flash_op_desc flash_op_desc = {.handler = write_op, .context = &context};

	nrf_flash_sync_set_context(FLASH_SLOT_WRITE);
	return nrf_flash_sync_exe(&flash_op_desc);
	}

	#endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */

	static int nrf_write(off_t addr, const void *data, size_t len)
	{
	int ret = 0;

	if (!is_within_bounds(addr, len, 0, RRAM_SIZE)) {
	return -EINVAL;
	}
	addr += RRAM_START;

	if (!len) {
	return 0;
	}

	LOG_DBG("Write: %p:%zu", (void *)addr, len);

	SYNC_LOCK();

	#ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE
	if (nrf_flash_sync_is_required()) {
	ret = write_synchronously(addr, data, len);
	} else
	#endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */
	{
	rram_write(addr, data, len);
	}

	SYNC_UNLOCK();

	return ret;
	}

	static int nrf_rram_read(const struct device dev, off_t addr, void data, size_t len)
	{
	ARG_UNUSED(dev);

	if (!is_within_bounds(addr, len, 0, RRAM_SIZE)) {
	return -EINVAL;
	}
	addr += RRAM_START;

	memcpy(data, (void *)addr, len);

	return 0;
	}

	static int nrf_rram_write(const struct device dev, off_t addr, const void data, size_t len)
	{
	ARG_UNUSED(dev);

	if (data == NULL) {
	return -EINVAL;
	}

	return nrf_write(addr, data, len);
	}

	static int nrf_rram_erase(const struct device *dev, off_t addr, size_t len)
	{
	ARG_UNUSED(dev);

	return nrf_write(addr, NULL, len);
	}

	int nrf_rram_get_size(const struct device dev, uint64_t size)
	{
	ARG_UNUSED(dev);

	*size = RRAM_SIZE;

	return 0;
	}

	static const struct flash_parameters nrf_rram_get_parameters(const struct device dev)
	{
	ARG_UNUSED(dev);

	static const struct flash_parameters parameters = {
	.write_block_size = WRITE_LINE_SIZE,
	.erase_value = ERASE_VALUE,
	.caps = {
	.no_explicit_erase = true,
	},
	};

	return &parameters;
	}

	#if defined(CONFIG_FLASH_PAGE_LAYOUT)
	static void nrf_rram_page_layout(const struct device dev, const struct flash_pages_layout *layout,
	size_t *layout_size)
	{
	ARG_UNUSED(dev);

	static const struct flash_pages_layout pages_layout = {
	.pages_count = PAGE_COUNT,
	.pages_size = PAGE_SIZE,
	};

	*layout = &pages_layout;
	*layout_size = 1;
	}
	#endif

	static DEVICE_API(flash, nrf_rram_api) = {
	.read = nrf_rram_read,
	.write = nrf_rram_write,
	.erase = nrf_rram_erase,
	.get_size = nrf_rram_get_size,
	.get_parameters = nrf_rram_get_parameters,
	#if defined(CONFIG_FLASH_PAGE_LAYOUT)
	.page_layout = nrf_rram_page_layout,
	#endif
	};

	static int nrf_rram_init(const struct device *dev)
	{
	ARG_UNUSED(dev);

	SYNC_INIT();

	#ifndef CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE
	nrf_flash_sync_init();
	#endif /* !CONFIG_SOC_FLASH_NRF_RADIO_SYNC_NONE */

	#if !defined(CONFIG_TRUSTED_EXECUTION_NONSECURE) && CONFIG_NRF_RRAM_READYNEXT_TIMEOUT_VALUE > 0
	nrf_rramc_ready_next_timeout_t params = {
	.value = CONFIG_NRF_RRAM_READYNEXT_TIMEOUT_VALUE,
	.enable = true,
	};

	nrf_rramc_ready_next_timeout_set(NRF_RRAMC, &params);
	#endif

	return 0;
	}

	DEVICE_DT_INST_DEFINE(0, nrf_rram_init, NULL, NULL, NULL, POST_KERNEL, CONFIG_FLASH_INIT_PRIORITY,
	&nrf_rram_api);