资源描述：
《fsl_sata控制器linux驱动实现分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、Author:YY_HongDepartment:EmSwDeptDate：2011-3-10Abstract本文给出了freescale公司的sata控制器的linux驱动实现方式。Analysethedifferencebetweenbareboardandtheboardinstalledlinux.Trytoaddresstheperformancebottbleneck.TextFreescale’ssatacontrollerdriverisinthelowestlayeroftheblockdriver.belowisthefig
2、ureshowuptherelationaboutalllayersinblockdriver:驱动是top-downtransmit。对/dev/sdx初始化安装ATA_BASE_SHT#defineATA_BASE_SHT(drv_name).module=THIS_MODULE,.name=drv_name,.ioctl=ata_scsi_ioctl,.queuecommand=ata_scsi_queuecmd,.can_queue=ATA_DEF_QUEUE,.this_id=ATA_SHT_THIS_ID,.cmd_p
3、er_lun=ATA_SHT_CMD_PER_LUN,.emulated=ATA_SHT_EMULATED,.use_clustering=ATA_SHT_USE_CLUSTERING,.proc_name=drv_name,.slave_configure=ata_scsi_slave_config,.slave_destroy=ata_scsi_slave_destroy,.bios_param=ata_std_bios_param,.unlock_native_capacity=ata_scsi_unlock_native_
4、capacity,.sdev_attrs=ata_common_sdev_attrs#defineATA_NCQ_SHT(drv_name)ATA_BASE_SHT(drv_name),.change_queue_depth=ata_scsi_change_queue_depthATA_PIO_SHT/*PIOonly,sg_tablesizeanddma_boundarylimitscanberemoved*/#defineATA_PIO_SHT(drv_name)ATA_BASE_SHT(drv_name),.sg_tablesi
5、ze=LIBATA_MAX_PRD,.dma_boundary=ATA_DMA_BOUNDARYATA_NCQ_SHT#defineATA_NCQ_SHT(drv_name)ATA_BASE_SHT(drv_name),.change_queue_depth=ata_scsi_change_queue_depthstructata_hoststructata_host{spinlock_tlock;structdevice*dev;void__iomem*const*iomap;unsignedintn_ports;void*privat
6、e_data;structata_port_operations*ops;unsignedlongflags;#ifdefCONFIG_ATA_ACPIacpi_handleacpi_handle;#endifstructata_port*simplex_claimed;/*channelowningtheDMA*/structata_port*ports[0];};structata_portstructata_port{structScsi_Host*scsi_host;/*ourco-allocatedscsihost*/structat
7、a_port_operations*ops;spinlock_t*lock;/*FlagsownedbytheEHcontext.OnlyEHshouldtouchtheseoncetheportisactive*/unsignedlongflags;/*ATA_FLAG_xxx*//*Flagsthatchangedynamically,protectedbyap->lock*/unsignedintpflags;/*ATA_PFLAG_xxx*/unsignedintprint_id;/*uservisibleuniqueportID*/u
8、nsignedintport_no;/*0basedportno.insidethehost*/#ifdefCONFIG_ATA_SFFstructa
