ARM-Linux驱动--MTD驱动分析(一)

时间：11-20 来源：互联网点击：

sanddelaytoensurethewrite
succeeds(butnotsleep).*/
int(*panic_write)(structmtd_info*mtd,loff_tto,size_tlen,size_t*retlen,constu_char*buf);
//用于MTD设备的OBB数据读写
int(*read_oob)(structmtd_info*mtd,loff_tfrom,
structmtd_oob_ops*ops);
int(*write_oob)(structmtd_info*mtd,loff_tto,
structmtd_oob_ops*ops);
/*
*Methodstoaccesstheprotectionregisterarea,presentinsome
*flashdevices.Theuserdataisonetimeprogrammablebutthe
*factorydataisreadonly.
*/
int(*get_fact_prot_info)(structmtd_info*mtd,structotp_info*buf,size_tlen);
int(*read_fact_prot_reg)(structmtd_info*mtd,loff_tfrom,size_tlen,size_t*retlen,u_char*buf);
int(*get_user_prot_info)(structmtd_info*mtd,structotp_info*buf,size_tlen);
int(*read_user_prot_reg)(structmtd_info*mtd,loff_tfrom,size_tlen,size_t*retlen,u_char*buf);
int(*write_user_prot_reg)(structmtd_info*mtd,loff_tfrom,size_tlen,size_t*retlen,u_char*buf);
int(*lock_user_prot_reg)(structmtd_info*mtd,loff_tfrom,size_tlen);
/*kvec-basedread/writemethods.
NB:Thecountparameteristhenumberof_vectors_,eachof
whichcontainsan(ofs,len)tuple.
*/
int(*writev)(structmtd_info*mtd,conststructkvec*vecs,unsignedlongcount,loff_tto,size_t*retlen);
/*Sync*/
//MTD设备的同步函数
void(*sync)(structmtd_info*mtd);
/*Chip-supporteddevicelocking*/
//芯片的加锁和解锁
int(*lock)(structmtd_info*mtd,loff_tofs,uint64_tlen);
int(*unlock)(structmtd_info*mtd,loff_tofs,uint64_tlen);
/*PowerManagementfunctions*/
//支持电源管理函数
int(*suspend)(structmtd_info*mtd);
void(*resume)(structmtd_info*mtd);
/*Badblockmanagementfunctions*/
//坏块管理函数
int(*block_isbad)(structmtd_info*mtd,loff_tofs);
int(*block_markbad)(structmtd_info*mtd,loff_tofs);
structnotifier_blockreboot_notifier;/*defaultmodebeforereboot*/
/*ECCstatusinformation*/
structmtd_ecc_statsecc_stats;//ECC状态信息
/*Subpageshift(NAND)*/
intsubpage_sft;
void*priv;//私有数据指针
structmodule*owner;
structdevicedev;
intusecount;//记录用户的个数
/*Ifthedriverissomethingsmart,likeUBI,itmayneedtomaintain
*itsownreferencecounting.Thebelowfunctionsareonlyfordriver.
*Thedrivermayregisteritscallbacks.Thesecallbacksarenot
*supposedtobecalledbyMTDusers*/
//驱动回调函数
int(*get_device)(structmtd_info*mtd);
void(*put_device)(structmtd_info*mtd);
};

2、mtd_part结构体信息

/*Ourpartitionlinkedlist*/
staticLIST_HEAD(mtd_partitions);//分区链表

/*Ourpartitionnodestructure*/
//分区结构信息
structmtd_part{
structmtd_infomtd;//mtd_info数据结构，会被加入mtd_table中
structmtd_info*master;//该分区的主分区
uint64_toffset;//该分区的偏移地址
structlist_headlist;//分区链表
};

3、mtd_partition描述mtd具体分区结构

/*
*Partitiondefinitionstructure:
*
*AnarrayofstructpartitionispassedalongwithaMTDobjectto
*add_mtd_partitions()tocreatethem.
*
*Foreachpartition,thesefieldsareavailable:
*name:stringthatwillbeusedtolabelthepartitionsMTDdevice.
*size:thepartitionsize;ifdefinedasMTDPART_SIZ_FULL,thepartition
*willextendtotheendofthemasterMTDdevice.
*offset:absolutestartingpositionwithinthemasterMTDdevice;if
*definedasMTDPART_OFS_APPEND,thepartitionwillstartwherethe
*previousoneended;ifMTDPART_OFS_NXTBLK,atthenexteraseblock.
*mask_flags:containsflagsthathavetobemasked(removed)fromthe
*masterMTDflagsetforthecorrespondingMTDpartition.
*Forexample,toforcearead-onlypartition,simplyadding
*MTD_WRITEABLEtothemask_flagswilldothetrick.
*
*Note:writeablepartitionsrequiretheirsizeandoffsetbe
*erasesizealigned(e.g.useMTDPART_OFS_NEXTBLK).
*/
structmtd_partition{
char*name;/*identifierstring分区名*/
uint64_tsize;/*partitionsize分区大小*/
uint64_toffset;/*offsetwithinthemasterMTDspace偏移地址*/
uint32_tmask_flags;/*masterMTDflagstomaskoutforthispartition*/
structnand_ecclayout*ecclayout;/*outofbandlayoutforthispartition(NANDonly)*/
};

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