uffs_device.h

flash管理算法

/*
    Copyright (C) 2005-2008  Ricky Zheng <[e-mail]>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*/
/** 
 * \file uffs_device.h
 * \brief uffs file system device structures definition
 * \author Ricky Zheng
 */

#ifndef UFFS_DEVICE_H
#define UFFS_DEVICE_H


#include "uffs/uffs_types.h"
#include "uffs/uffs_config.h"
#include "uffs/uffs_buf.h"
#include "uffs/uffs_blockInfo.h"
#include "uffs/ubuffer.h"
#include "uffs/uffs_tree.h"
#include "uffs/uffs_mem.h"
#include "uffs/uffs_core.h"

#ifdef __cplusplus
extern "C"{
#endif


/************************* uffs device *************************/
/** 
 * \struct uffs_FlashOpsSt
 * \brief flash specific operations
 */
struct uffs_FlashOpsSt {
	URET (*LoadPageSpare)(uffs_Device *dev, int block, int page, uffs_Tags *tag);
	URET (*WritePageSpare)(uffs_Device *dev, int block, int page, uffs_Tags *tag);
	URET (*MakePageValid)(uffs_Device *dev, int block, int page, uffs_Tags *tag);
	int  (*GetEccSize)(uffs_Device *dev);
	void (*MakeEcc)(uffs_Device *dev, void *data, void *ecc);
	int (*EccCollect)(uffs_Device *dev, void *data, void *read_ecc, const void *test_ecc);
	UBOOL (*IsBlockBad)(uffs_Device *dev, uffs_blockInfo *bc);
	URET (*MakeBadBlockMark)(uffs_Device *dev, int block);
};

#define MAN_ID_SAMSUNG	0xEC	// manufacture ID of samsung
#define MAN_ID_SIMRAM	0xFF	// manufacture ID when using RAM simulator

/**
 * \struct uffs_FlashClassSt
 * \brief Flash class descriptor
 */
struct uffs_FlashClassSt {
	const char *className;
	int maker;					// manufacture ID
	int *id_list;
	struct uffs_FlashOpsSt *flash;
	URET (*InitClass)(uffs_Device *dev, int id);
};

/**
 * \struct uffs_DeviceOpsSt 
 * \brief flash physical operations, should be implement in each flash types
 */
struct uffs_DeviceOpsSt {
	URET (*Reset)(uffs_Device *dev);
	UBOOL (*IsBlockBad)(uffs_Device *dev, u32 block);
	URET (*MarkBadBlock)(uffs_Device *dev, u32 block);
	URET (*EraseBlock)(uffs_Device *dev, u32 block);
	URET (*WritePage)(uffs_Device *dev, u32 block, u32 pageNum, const u8 *page, const u8 *spare);
	URET (*WritePageData)(uffs_Device *dev, u32 block, u32 pageNum, const u8 *page, int ofs, int len);
	URET (*WritePageSpare)(uffs_Device *dev, u32 block, u32 pageNum, const u8 *spare, int ofs, int len);
	URET (*ReadPage)(uffs_Device *dev, u32 block, u32 pageNum, u8 *page, u8 *spare);
	URET (*ReadPageData)(uffs_Device *dev, u32 block, u32 pageNum, u8 *page, int ofs, int len);
	URET (*ReadPageSpare)(uffs_Device *dev, u32 block, u32 pageNum, u8 *spare, int ofs, int len);
};



/** UFFS device type: uffs_DeviceSt.dev_type */
#define UFFS_DEV_NULL		0
#define UFFS_DEV_NAND		1
#define UFFS_DEV_SM			2
#define UFFS_DEV_RAM		3
#define UFFS_DEV_ROM		4
#define UFFS_DEV_EMU		5


/** 
 * \struct uffs_storageAttrSt
 * \brief uffs device storage attribute, provide by nand specific file
 */
struct uffs_storageAttrSt {
	u32 dev_type;			//!< device type
	int maker;				//!< flash maker
	int id;					//!< chip id, or device id
	u32 total_blocks;		//!< total blocks in this chip
	u32 block_data_size;	//!< block data size (= page_data_size * pages_per_block)
	u16 page_data_size;		//!< page data size (physical page data size, e.g. 512)
	u16 spare_size;			//!< page spare size (physical page spare size, e.g. 16)
	u16 pages_per_block;	//!< pages per block
	u16 block_status_offs;	//!< block status byte in spare
};


/** 
 * \struct uffs_blockInfoCacheSt
 * \brief block information structure, used to manager block information caches
 */
struct uffs_blockInfoCacheSt {
	uffs_blockInfo *head;			//!< buffer head of block info(spares)
	uffs_blockInfo *tail;
	int maxBlockCached;				//!< maximun block info buffers
	void *internalBufHead;			//!< internal buffer head, used for release whole buffer
};

/** 
 * \struct uffs_partitionSt
 * \brief partition basic information
 */
struct uffs_partitionSt {
	u16 start;		//!< start block number of partition
	u16 end;		//!< end block number of partiton
};

/** 
 * \struct uffs_lockSt
 * \brief lock stuffs
 */
struct uffs_lockSt {
	u32 sem;
	u32 task_id;
	int counter;
};

/** 
 * \struct uffs_pageBufsSt
 */
struct uffs_pageBufsSt {
	uffs_Buf *bufHead;
	uffs_Buf *bufTail;
	uffs_Buf *dirty;
	int maxBuf;
	int maxDirtyBuf;
	int dirtyCount;
	void *pool;
};


/** 
 * \struct uffs_commInfoSt
 * \brief common data for device, should be initialized at early
 * \note it is possible that pgSize is smaller than physical page size, but normally they are the same
 */
struct uffs_commInfoSt {
	u32 pgDataSize;			//!< page data size
	u32 eccSize;			//!< ecc size
	u32 pgSize;				//!< page size = page data size + ecc size
};


struct uffs_newBadBlockSt {
	u16 block;				//!< bad block, FIX ME to process more than one bad block
};

/** statistic of flash read/write/erase activities */
typedef struct {
	int blockEraseCount;
	int pageWriteCount;
	int pageReadCount;
	int spareWriteCount;
	int spareReadCount;
} uffs_stat;


/** 
 * \struct uffs_DeviceSt
 * \brief The core data structure of UFFS, all information needed by manipulate UFFS object
 * \note one partition corresponding one uffs device.
 */
struct uffs_DeviceSt {
	URET (*Init)(uffs_Device *dev);				//!< low level initialization
	URET (*Release)(uffs_Device *dev);			//!< low level release
	void *private;								//!< private data for device

	struct uffs_storageAttrSt attr;				//!< storage attribute
	struct uffs_partitionSt par;				//!< partition information
	const struct uffs_FlashOpsSt *flash;		//!< flash specific operations
	struct uffs_DeviceOpsSt *ops;				//!< NAND device operations
	struct uffs_blockInfoCacheSt bc;			//!< block info cache
	struct uffs_lockSt lock;					//!< lock data structure
	struct uffs_pageBufsSt buf;					//!< page buffers
	struct uffs_commInfoSt com;					//!< common information
	struct uffs_treeSt tree;					//!< tree list of block
	struct uffs_newBadBlockSt bad;				//!< new bad block
	uffs_stat st;								//!< statistic counter
	struct uffs_memAllocatorSt *mem;			//!< uffs native memory allocator
	u32 refCount;								//!< device reference count
};

URET uffs_DeviceInitLock(uffs_Device *dev);
URET uffs_DeviceLock(uffs_Device *dev);
URET uffs_DeviceUnLock(uffs_Device *dev);
uffs_Device * uffs_GetDevice(const char *mountPoint);
const char * uffs_GetDeviceMountPoint(uffs_Device *dev);
void uffs_PutDevice(uffs_Device *dev);



#ifdef __cplusplus
}
#endif


#endif