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