mirror of
https://github.com/zephyrproject-rtos/zephyr
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2b5b7da9f3
Add support for enabling multiple disk interfaces (Flash, RAM) simultaneously in Zephyr by introducing a simple disk interface framework where we can register multiple disks which would interface with different storage devices. This would enable us to have multiple instances of FATFS in Zephyr. Add support for mass storage drive disk name which will be used as an argument when calling the disk interface API's. Enable multiple volumes support configuration in ELM FAT library. Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <zephyr/types.h>
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#include <misc/__assert.h>
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#include <disk_access.h>
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#include <errno.h>
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#include <init.h>
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#include <device.h>
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#define RAMDISK_SECTOR_SIZE 512
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#if defined(CONFIG_USB_MASS_STORAGE)
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/* A 16KB initialized RAMdisk which will fit on most target's RAM. It
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* is initialized with a valid file system for validating USB mass storage.
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*/
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#include "fat12_ramdisk.h"
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#else
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/* A 96KB RAM Disk, which meets ELM FAT fs's minimum block requirement. Fit for
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* qemu testing (as it may exceed target's RAM limits).
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*/
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#define RAMDISK_VOLUME_SIZE (192 * RAMDISK_SECTOR_SIZE)
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static u8_t ramdisk_buf[RAMDISK_VOLUME_SIZE];
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#endif
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static void *lba_to_address(u32_t lba)
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{
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__ASSERT(((lba * RAMDISK_SECTOR_SIZE) < RAMDISK_VOLUME_SIZE),
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"FS bound error");
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return &ramdisk_buf[(lba * RAMDISK_SECTOR_SIZE)];
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}
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static int disk_ram_access_status(struct disk_info *disk)
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{
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return DISK_STATUS_OK;
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}
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static int disk_ram_access_init(struct disk_info *disk)
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{
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return 0;
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}
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static int disk_ram_access_read(struct disk_info *disk, u8_t *buff,
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u32_t sector, u32_t count)
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{
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memcpy(buff, lba_to_address(sector), count * RAMDISK_SECTOR_SIZE);
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return 0;
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}
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static int disk_ram_access_write(struct disk_info *disk, const u8_t *buff,
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u32_t sector, u32_t count)
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{
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memcpy(lba_to_address(sector), buff, count * RAMDISK_SECTOR_SIZE);
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return 0;
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}
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static int disk_ram_access_ioctl(struct disk_info *disk, u8_t cmd, void *buff)
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{
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switch (cmd) {
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case DISK_IOCTL_CTRL_SYNC:
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break;
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case DISK_IOCTL_GET_SECTOR_COUNT:
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*(u32_t *)buff = RAMDISK_VOLUME_SIZE / RAMDISK_SECTOR_SIZE;
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break;
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case DISK_IOCTL_GET_SECTOR_SIZE:
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*(u32_t *)buff = RAMDISK_SECTOR_SIZE;
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break;
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case DISK_IOCTL_GET_ERASE_BLOCK_SZ:
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*(u32_t *)buff = 1;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct disk_operations ram_disk_ops = {
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.init = disk_ram_access_init,
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.status = disk_ram_access_status,
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.read = disk_ram_access_read,
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.write = disk_ram_access_write,
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.ioctl = disk_ram_access_ioctl,
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};
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static struct disk_info ram_disk = {
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.name = CONFIG_DISK_RAM_VOLUME_NAME,
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.ops = &ram_disk_ops,
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};
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static int disk_ram_init(struct device *dev)
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{
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ARG_UNUSED(dev);
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return disk_access_register(&ram_disk);
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}
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SYS_INIT(disk_ram_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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