175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
/*
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* Copyright (C) 2015-2016 Intel Corp. All rights reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef __RPMB_H__
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#define __RPMB_H__
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <uapi/linux/rpmb.h>
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#include <linux/kref.h>
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/**
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* enum rpmb_type - type of underlaying storage technology
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*
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* @RPMB_TYPE_ANY : any type used for search only
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* @RPMB_TYPE_EMMC : emmc (JESD84-B50.1)
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* @RPMB_TYPE_UFS : UFS (JESD220)
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* @RPMB_TYPE_SIM : Simulation Device type
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* @RPMB_TYPE_MAX : upper sentinel
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*/
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enum rpmb_type {
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RPMB_TYPE_ANY = 0,
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RPMB_TYPE_EMMC,
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RPMB_TYPE_UFS,
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RPMB_TYPE_SIM,
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RPMB_TYPE_MAX = RPMB_TYPE_SIM
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};
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extern struct class rpmb_class;
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/**
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* struct rpmb_cmd: rpmb access command
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*
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* @flags: command flags
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* 0 - read command
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* 1 - write commnad RPMB_F_WRITE
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* 2 - reliable write RPMB_F_REL_WRITE
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* @nframes: number of rpmb frames in the command
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* @frames: list of rpmb frames
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*/
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struct rpmb_cmd {
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u32 flags;
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u32 nframes;
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struct rpmb_frame *frames __aligned(8);
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};
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/**
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* struct rpmb_data - rpmb data be transmitted in RPMB request
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*
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* @req_type: request type (program key, read, write, write counter)
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* @icmd: list of input frames (in the view of device)
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* @ocmd: list of result frames (in the view of device)
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*/
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struct rpmb_data {
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u16 req_type;
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struct rpmb_cmd icmd;
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struct rpmb_cmd ocmd;
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};
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/**
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* struct rpmb_ops - RPMB ops to be implemented by underlaying block device
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*
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* @cmd_seq : send RPMB command sequence to the RPBM partition
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* backed by the disk
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* @type : block device type
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* @dev_id : unique device identifier
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* @dev_id_len : unique device identifier length
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* @reliable_wr_cnt: number of sectors that can be written in one access
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*/
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struct rpmb_ops {
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int (*cmd_seq)(struct device *dev, struct rpmb_cmd *cmds, u32 ncmds);
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enum rpmb_type type;
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const u8 *dev_id;
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size_t dev_id_len;
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u16 reliable_wr_cnt;
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};
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/**
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* struct rpmb_dev - device which can support RPMB partition
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*
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* @lock : the device lock
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* @dev : device
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* @id : device id
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* @cdev : character dev
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* @status : device status
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* @ops : operation exported by block layer
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*/
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struct rpmb_dev {
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struct mutex lock; /* device serialization lock */
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struct device dev;
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int id;
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#ifdef CONFIG_RPMB_INTF_DEV
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struct cdev cdev;
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unsigned long status;
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#endif /* CONFIG_RPMB_INTF_DEV */
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const struct rpmb_ops *ops;
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};
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#define to_rpmb_dev(x) container_of((x), struct rpmb_dev, dev)
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#if IS_ENABLED(CONFIG_RPMB)
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struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev);
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void rpmb_dev_put(struct rpmb_dev *rdev);
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struct rpmb_dev *rpmb_dev_find_by_device(struct device *parent);
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struct rpmb_dev *rpmb_dev_get_by_type(enum rpmb_type type);
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struct rpmb_dev *rpmb_dev_register(struct device *dev,
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const struct rpmb_ops *ops);
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struct rpmb_dev *rpmb_dev_find_device(void *data,
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int (*match)(struct device *dev, const void *data));
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int rpmb_dev_unregister(struct device *dev);
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int rpmb_cmd_seq(struct rpmb_dev *rdev, struct rpmb_cmd *cmds, u32 ncmds);
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int rpmb_cmd_req(struct rpmb_dev *rdev, struct rpmb_data *data);
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u16 rpmb_get_rw_size(struct rpmb_dev *rdev);
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#else
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static inline struct rpmb_dev *rpmb_dev_get(struct rpmb_dev *rdev)
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{
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return NULL;
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}
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static inline void rpmb_dev_put(struct rpmb_dev *rdev) { }
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static inline struct rpmb_dev *rpmb_dev_find_by_device(struct device *parent)
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{
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return NULL;
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}
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static inline
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struct rpmb_dev *rpmb_dev_get_by_type(enum rpmb_type type)
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{
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return NULL;
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}
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static inline struct rpmb_dev *
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rpmb_dev_register(struct device *dev, const struct rpmb_ops *ops)
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{
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return NULL;
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}
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static inline int rpmb_dev_unregister(struct device *dev)
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{
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return 0;
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}
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static inline int rpmb_cmd_seq(struct rpmb_dev *rdev,
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struct rpmb_cmd *cmds, u32 ncmds)
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{
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return 0;
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}
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static inline int rpmb_cmd_req(struct rpmb_dev *rdev, struct rpmb_data *data)
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{
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return 0;
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}
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static inline int rpmb_get_rw_size(struct rpmb_dev *rdev)
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{
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return 0;
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}
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#endif /* CONFIG_RPMB */
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#endif /* __RPMB_H__ */
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