blob: 740318204596db07761acdecd88860bba8d6d021 [file] [log] [blame] [edit]
/*
* Copyright (c) 2023, Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT zephyr_retained_ram
#include <string.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/retained_mem.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(retained_mem_zephyr_ram, CONFIG_RETAINED_MEM_LOG_LEVEL);
#ifdef CONFIG_RETAINED_MEM_MUTEXES
struct zephyr_retained_mem_ram_data {
struct k_mutex lock;
};
#endif
struct zephyr_retained_mem_ram_config {
uint8_t *address;
size_t size;
};
static inline void zephyr_retained_mem_ram_lock_take(const struct device *dev)
{
#ifdef CONFIG_RETAINED_MEM_MUTEXES
struct zephyr_retained_mem_ram_data *data = dev->data;
k_mutex_lock(&data->lock, K_FOREVER);
#else
ARG_UNUSED(dev);
#endif
}
static inline void zephyr_retained_mem_ram_lock_release(const struct device *dev)
{
#ifdef CONFIG_RETAINED_MEM_MUTEXES
struct zephyr_retained_mem_ram_data *data = dev->data;
k_mutex_unlock(&data->lock);
#else
ARG_UNUSED(dev);
#endif
}
static int zephyr_retained_mem_ram_init(const struct device *dev)
{
#ifdef CONFIG_RETAINED_MEM_MUTEXES
struct zephyr_retained_mem_ram_data *data = dev->data;
k_mutex_init(&data->lock);
#endif
return 0;
}
static ssize_t zephyr_retained_mem_ram_size(const struct device *dev)
{
const struct zephyr_retained_mem_ram_config *config = dev->config;
return (ssize_t)config->size;
}
static int zephyr_retained_mem_ram_read(const struct device *dev, off_t offset, uint8_t *buffer,
size_t size)
{
const struct zephyr_retained_mem_ram_config *config = dev->config;
zephyr_retained_mem_ram_lock_take(dev);
memcpy(buffer, (config->address + offset), size);
zephyr_retained_mem_ram_lock_release(dev);
return 0;
}
static int zephyr_retained_mem_ram_write(const struct device *dev, off_t offset,
const uint8_t *buffer, size_t size)
{
const struct zephyr_retained_mem_ram_config *config = dev->config;
zephyr_retained_mem_ram_lock_take(dev);
memcpy((config->address + offset), buffer, size);
zephyr_retained_mem_ram_lock_release(dev);
return 0;
}
static int zephyr_retained_mem_ram_clear(const struct device *dev)
{
const struct zephyr_retained_mem_ram_config *config = dev->config;
zephyr_retained_mem_ram_lock_take(dev);
memset(config->address, 0, config->size);
zephyr_retained_mem_ram_lock_release(dev);
return 0;
}
static const struct retained_mem_driver_api zephyr_retained_mem_ram_api = {
.size = zephyr_retained_mem_ram_size,
.read = zephyr_retained_mem_ram_read,
.write = zephyr_retained_mem_ram_write,
.clear = zephyr_retained_mem_ram_clear,
};
#define ZEPHYR_RETAINED_MEM_RAM_DEVICE(inst) \
IF_ENABLED(CONFIG_RETAINED_MEM_MUTEXES, \
(static struct zephyr_retained_mem_ram_data \
zephyr_retained_mem_ram_data_##inst;) \
) \
static const struct zephyr_retained_mem_ram_config \
zephyr_retained_mem_ram_config_##inst = { \
.address = (uint8_t *)DT_REG_ADDR(DT_PARENT(DT_INST(inst, DT_DRV_COMPAT))), \
.size = DT_REG_SIZE(DT_PARENT(DT_INST(inst, DT_DRV_COMPAT))), \
}; \
DEVICE_DT_INST_DEFINE(inst, \
&zephyr_retained_mem_ram_init, \
NULL, \
COND_CODE_1(CONFIG_RETAINED_MEM_MUTEXES, \
(&zephyr_retained_mem_ram_data_##inst), (NULL) \
), \
&zephyr_retained_mem_ram_config_##inst, \
POST_KERNEL, \
CONFIG_RETAINED_MEM_INIT_PRIORITY, \
&zephyr_retained_mem_ram_api);
DT_INST_FOREACH_STATUS_OKAY(ZEPHYR_RETAINED_MEM_RAM_DEVICE)