/*
* Copyright (c) 2016 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <zephyr/types.h>
#include <sys/__assert.h>
#include <disk/disk_access.h>
#include <errno.h>
#include <init.h>
#include <device.h>
#define RAMDISK_SECTOR_SIZE 512
#if defined(CONFIG_USB_MASS_STORAGE)
/* A 16KB initialized RAMdisk which will fit on most target's RAM. It
* is initialized with a valid file system for validating USB mass storage.
*/
#include "fat12_ramdisk.h"
#else
/* RAM Disk of configurable size. Fit for qemu testing (as it may exceed
* target's RAM limits).
*/
#define RAMDISK_VOLUME_SIZE (CONFIG_DISK_RAM_VOLUME_SIZE * 1024)
static u8_t ramdisk_buf[RAMDISK_VOLUME_SIZE];
#endif
static void *lba_to_address(u32_t lba)
{
__ASSERT(((lba * RAMDISK_SECTOR_SIZE) < RAMDISK_VOLUME_SIZE),
"FS bound error");
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, u8_t *buff,
u32_t sector, u32_t count)
{
memcpy(buff, lba_to_address(sector), count * RAMDISK_SECTOR_SIZE);
return 0;
}
static int disk_ram_access_write(struct disk_info *disk, const u8_t *buff,
u32_t sector, u32_t count)
{
memcpy(lba_to_address(sector), buff, count * RAMDISK_SECTOR_SIZE);
return 0;
}
static int disk_ram_access_ioctl(struct disk_info *disk, u8_t cmd, void *buff)
{
switch (cmd) {
case DISK_IOCTL_CTRL_SYNC:
break;
case DISK_IOCTL_GET_SECTOR_COUNT:
*(u32_t *)buff = RAMDISK_VOLUME_SIZE / RAMDISK_SECTOR_SIZE;
break;
case DISK_IOCTL_GET_SECTOR_SIZE:
*(u32_t *)buff = RAMDISK_SECTOR_SIZE;
break;
case DISK_IOCTL_GET_ERASE_BLOCK_SZ:
*(u32_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(struct device *dev)
{
ARG_UNUSED(dev);
return disk_access_register(&ram_disk);
}
SYS_INIT(disk_ram_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);