ARM-Linux驱动--MTD驱动分析(三)

时间：11-20 来源：互联网点击：

td_part*part=PART(mtd);
if(!(mtd->flags&MTD_WRITEABLE))
return-EROFS;
returnpart->master->writev(part->master,vecs,count,
to+part->offset,retlen);
}
staticintpart_erase(structmtd_info*mtd,structerase_info*instr)
{
structmtd_part*part=PART(mtd);
intret;
if(!(mtd->flags&MTD_WRITEABLE))
return-EROFS;
if(instr->addr>=mtd->size)
return-EINVAL;
instr->addr+=part->offset;
ret=part->master->erase(part->master,instr);
if(ret){
if(instr->fail_addr!=MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr-=part->offset;
instr->addr-=part->offset;
}
returnret;
}
voidmtd_erase_callback(structerase_info*instr)
{
if(instr->mtd->erase==part_erase){
structmtd_part*part=PART(instr->mtd);
if(instr->fail_addr!=MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr-=part->offset;
instr->addr-=part->offset;
}
if(instr->callback)
instr->callback(instr);
}
EXPORT_SYMBOL_GPL(mtd_erase_callback);
staticintpart_lock(structmtd_info*mtd,loff_tofs,uint64_tlen)
{
structmtd_part*part=PART(mtd);
if((len+ofs)>mtd->size)
return-EINVAL;
returnpart->master->lock(part->master,ofs+part->offset,len);
}
staticintpart_unlock(structmtd_info*mtd,loff_tofs,uint64_tlen)
{
structmtd_part*part=PART(mtd);
if((len+ofs)>mtd->size)
return-EINVAL;
returnpart->master->unlock(part->master,ofs+part->offset,len);
}
//分区同步函数
staticvoidpart_sync(structmtd_info*mtd)
{
structmtd_part*part=PART(mtd);
part->master->sync(part->master);
}
//支持电源管理的功能函数
staticintpart_suspend(structmtd_info*mtd)
{
structmtd_part*part=PART(mtd);
returnpart->master->suspend(part->master);
}
staticvoidpart_resume(structmtd_info*mtd)
{
structmtd_part*part=PART(mtd);
part->master->resume(part->master);
}
staticintpart_block_isbad(structmtd_info*mtd,loff_tofs)
{
structmtd_part*part=PART(mtd);
if(ofs>=mtd->size)
return-EINVAL;
ofs+=part->offset;
returnpart->master->block_isbad(part->master,ofs);
}
//标记设备地址坏块
staticintpart_block_markbad(structmtd_info*mtd,loff_tofs)
{
structmtd_part*part=PART(mtd);
intres;
if(!(mtd->flags&MTD_WRITEABLE))
return-EROFS;
if(ofs>=mtd->size)
return-EINVAL;
ofs+=part->offset;
res=part->master->block_markbad(part->master,ofs);
if(!res)
mtd->ecc_stats.badblocks++;
returnres;
}

下篇分析具体的MTD设备，字符设备和块设备，待续........

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