1a3fec70dSJoseph Chen /* SPDX-License-Identifier: GPL-2.0+ */ 2a3fec70dSJoseph Chen /* 3a3fec70dSJoseph Chen * (C) Copyright 2018 Rockchip Electronics Co., Ltd 4a3fec70dSJoseph Chen */ 5a3fec70dSJoseph Chen 6a3fec70dSJoseph Chen #ifndef __RAMDISK_H__ 7a3fec70dSJoseph Chen #define __RAMDISK_H__ 8a3fec70dSJoseph Chen 9a3fec70dSJoseph Chen struct ramdisk_ops { 10a3fec70dSJoseph Chen /* 11a3fec70dSJoseph Chen * read() - read from a block device 12a3fec70dSJoseph Chen * 13a3fec70dSJoseph Chen * @desc: Block descriptor 14a3fec70dSJoseph Chen * @start: Start block number to read 15a3fec70dSJoseph Chen * @blkcnt: Number of blocks to read 16a3fec70dSJoseph Chen * @buffer: Destination buffer for data read 17a3fec70dSJoseph Chen * 18a3fec70dSJoseph Chen * @return blkcnt is OK, otherwise is error. 19a3fec70dSJoseph Chen */ 20a3fec70dSJoseph Chen ulong (*read)(struct blk_desc *desc, 21a3fec70dSJoseph Chen lbaint_t start, lbaint_t blkcnt, void *buffer); 22a3fec70dSJoseph Chen 23a3fec70dSJoseph Chen /* 24a3fec70dSJoseph Chen * write() - write to a block device 25a3fec70dSJoseph Chen * 26a3fec70dSJoseph Chen * @desc: Block descriptor 27a3fec70dSJoseph Chen * @start: Start block number to write 28a3fec70dSJoseph Chen * @blkcnt: Number of blocks to write 29a3fec70dSJoseph Chen * @buffer: Source buffer for data to write 30a3fec70dSJoseph Chen * 31a3fec70dSJoseph Chen * @return blkcnt is OK, otherwise is error. 32a3fec70dSJoseph Chen */ 33a3fec70dSJoseph Chen 34a3fec70dSJoseph Chen ulong (*write)(struct blk_desc *desc, 35a3fec70dSJoseph Chen lbaint_t start, lbaint_t blkcnt, const void *buffer); 36a3fec70dSJoseph Chen /* 37a3fec70dSJoseph Chen * erase() - erase a section of a block device 38a3fec70dSJoseph Chen * 39a3fec70dSJoseph Chen * @desc: Block descriptor 40a3fec70dSJoseph Chen * @start: Start block number to erase 41a3fec70dSJoseph Chen * @blkcnt: Number of blocks to erase 42a3fec70dSJoseph Chen * 43a3fec70dSJoseph Chen * @return blkcnt is OK, otherwise is error. 44a3fec70dSJoseph Chen */ 45a3fec70dSJoseph Chen ulong (*erase)(struct blk_desc *desc, lbaint_t start, lbaint_t blkcnt); 46a3fec70dSJoseph Chen }; 47a3fec70dSJoseph Chen 48*b5644a89SJoseph Chen int dm_ramdisk_is_enabled(void); 49*b5644a89SJoseph Chen 50a3fec70dSJoseph Chen #endif /* __RAMDISK_H__ */ 51