113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2016 Intel Corporation.
|
|
* Copyright (c) 2021, Nordic Semiconductor ASA
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <zephyr/types.h>
|
|
#include <zephyr/drivers/disk.h>
|
|
#include <errno.h>
|
|
#include <zephyr/init.h>
|
|
#include <zephyr/device.h>
|
|
#include <zephyr/logging/log.h>
|
|
|
|
LOG_MODULE_REGISTER(ramdisk, CONFIG_RAMDISK_LOG_LEVEL);
|
|
|
|
#define RAMDISK_SECTOR_SIZE 512
|
|
#define RAMDISK_VOLUME_SIZE (CONFIG_DISK_RAM_VOLUME_SIZE * 1024)
|
|
#define RAMDISK_SECTOR_COUNT (RAMDISK_VOLUME_SIZE / RAMDISK_SECTOR_SIZE)
|
|
|
|
static uint8_t ramdisk_buf[RAMDISK_VOLUME_SIZE];
|
|
|
|
static void *lba_to_address(uint32_t lba)
|
|
{
|
|
return &ramdisk_buf[lba * RAMDISK_SECTOR_SIZE];
|
|
}
|
|
|
|
static int disk_ram_access_status(struct disk_info *disk)
|
|
{
|
|
return DISK_STATUS_OK;
|
|
}
|
|
|
|
static int disk_ram_access_init(struct disk_info *disk)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int disk_ram_access_read(struct disk_info *disk, uint8_t *buff,
|
|
uint32_t sector, uint32_t count)
|
|
{
|
|
uint32_t last_sector = sector + count;
|
|
|
|
if (last_sector < sector || last_sector > RAMDISK_SECTOR_COUNT) {
|
|
LOG_ERR("Sector %" PRIu32 " is outside the range %u",
|
|
last_sector, RAMDISK_SECTOR_COUNT);
|
|
return -EIO;
|
|
}
|
|
|
|
memcpy(buff, lba_to_address(sector), count * RAMDISK_SECTOR_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int disk_ram_access_write(struct disk_info *disk, const uint8_t *buff,
|
|
uint32_t sector, uint32_t count)
|
|
{
|
|
uint32_t last_sector = sector + count;
|
|
|
|
if (last_sector < sector || last_sector > RAMDISK_SECTOR_COUNT) {
|
|
LOG_ERR("Sector %" PRIu32 " is outside the range %u",
|
|
last_sector, RAMDISK_SECTOR_COUNT);
|
|
return -EIO;
|
|
}
|
|
|
|
memcpy(lba_to_address(sector), buff, count * RAMDISK_SECTOR_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int disk_ram_access_ioctl(struct disk_info *disk, uint8_t cmd, void *buff)
|
|
{
|
|
switch (cmd) {
|
|
case DISK_IOCTL_CTRL_SYNC:
|
|
break;
|
|
case DISK_IOCTL_GET_SECTOR_COUNT:
|
|
*(uint32_t *)buff = RAMDISK_SECTOR_COUNT;
|
|
break;
|
|
case DISK_IOCTL_GET_SECTOR_SIZE:
|
|
*(uint32_t *)buff = RAMDISK_SECTOR_SIZE;
|
|
break;
|
|
case DISK_IOCTL_GET_ERASE_BLOCK_SZ:
|
|
*(uint32_t *)buff = 1U;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct disk_operations ram_disk_ops = {
|
|
.init = disk_ram_access_init,
|
|
.status = disk_ram_access_status,
|
|
.read = disk_ram_access_read,
|
|
.write = disk_ram_access_write,
|
|
.ioctl = disk_ram_access_ioctl,
|
|
};
|
|
|
|
static struct disk_info ram_disk = {
|
|
.name = CONFIG_DISK_RAM_VOLUME_NAME,
|
|
.ops = &ram_disk_ops,
|
|
};
|
|
|
|
static int disk_ram_init(const struct device *dev)
|
|
{
|
|
ARG_UNUSED(dev);
|
|
|
|
return disk_access_register(&ram_disk);
|
|
}
|
|
|
|
SYS_INIT(disk_ram_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
|