1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0+ */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * (C) Copyright 2018 Rockchip Electronics Co., Ltd 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #ifndef __RAMDISK_H__ 7*4882a593Smuzhiyun #define __RAMDISK_H__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun struct ramdisk_ops { 10*4882a593Smuzhiyun /* 11*4882a593Smuzhiyun * read() - read from a block device 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * @desc: Block descriptor 14*4882a593Smuzhiyun * @start: Start block number to read 15*4882a593Smuzhiyun * @blkcnt: Number of blocks to read 16*4882a593Smuzhiyun * @buffer: Destination buffer for data read 17*4882a593Smuzhiyun * 18*4882a593Smuzhiyun * @return blkcnt is OK, otherwise is error. 19*4882a593Smuzhiyun */ 20*4882a593Smuzhiyun ulong (*read)(struct blk_desc *desc, 21*4882a593Smuzhiyun lbaint_t start, lbaint_t blkcnt, void *buffer); 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun /* 24*4882a593Smuzhiyun * write() - write to a block device 25*4882a593Smuzhiyun * 26*4882a593Smuzhiyun * @desc: Block descriptor 27*4882a593Smuzhiyun * @start: Start block number to write 28*4882a593Smuzhiyun * @blkcnt: Number of blocks to write 29*4882a593Smuzhiyun * @buffer: Source buffer for data to write 30*4882a593Smuzhiyun * 31*4882a593Smuzhiyun * @return blkcnt is OK, otherwise is error. 32*4882a593Smuzhiyun */ 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun ulong (*write)(struct blk_desc *desc, 35*4882a593Smuzhiyun lbaint_t start, lbaint_t blkcnt, const void *buffer); 36*4882a593Smuzhiyun /* 37*4882a593Smuzhiyun * erase() - erase a section of a block device 38*4882a593Smuzhiyun * 39*4882a593Smuzhiyun * @desc: Block descriptor 40*4882a593Smuzhiyun * @start: Start block number to erase 41*4882a593Smuzhiyun * @blkcnt: Number of blocks to erase 42*4882a593Smuzhiyun * 43*4882a593Smuzhiyun * @return blkcnt is OK, otherwise is error. 44*4882a593Smuzhiyun */ 45*4882a593Smuzhiyun ulong (*erase)(struct blk_desc *desc, lbaint_t start, lbaint_t blkcnt); 46*4882a593Smuzhiyun }; 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun int dm_ramdisk_is_enabled(void); 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun #endif /* __RAMDISK_H__ */ 51