📄 linux设备驱动之usb主机控制器驱动分析-(6)_linux技术文章_linux_操作系统6.htm
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<P>create_debug_entry;<BR>
}<BR> uhci->dentry =
dentry;<BR> }<BR>建立fsbr_timer定时器.
这个定时器跟USB的高速传输有关.在后面再给出详细的分析.忽略选择调试的部份.<BR> <BR>
//1024个frame 指针<BR> uhci->frame =
dma_alloc_coherent(uhci_dev(uhci),<BR>
UHCI_NUMFRAMES *
sizeof(*uhci->frame),<BR>
&uhci->frame_dma_handle, 0);<BR> if
(!uhci->frame) {<BR>
dev_err(uhci_dev(uhci), "unable to allocate
"<BR>
"consistent memory for frame
list\n");<BR> goto
err_alloc_frame;<BR> }<BR>
memset(uhci->frame, 0, UHCI_NUMFRAMES *
sizeof(*uhci->frame));<BR> <BR> //cpu
的frame指针<BR> uhci->frame_cpu =
kcalloc(UHCI_NUMFRAMES,
sizeof(*uhci->frame_cpu),<BR>
GFP_KERNEL);<BR> if (!uhci->frame_cpu)
{<BR> dev_err(uhci_dev(uhci),
"unable to allocate
"<BR>
"memory for frame
pointers\n");<BR> goto
err_alloc_frame_cpu;<BR> }<BR>按照UHCI
SPEC的要求,初始化1024个frame
list.在这里,UHCI都是使用DMA进行数据交互的.因此调用了dma_alloc_coherent的接口分配DMA内存.物理地址会保存在uhci->frame_dma_handle中.<BR>然后再初始化了1024上cpu
frame.这个结构是用来做辅助的,并不会影响具体的硬件<BR> <BR>
//创建uhci_td的pool<BR> uhci->td_pool =
dma_pool_create("uhci_td",
uhci_dev(uhci),<BR>
sizeof(struct uhci_td), 16, 0);<BR> if
(!uhci->td_pool) {<BR>
dev_err(uhci_dev(uhci), "unable to create td
dma_pool\n");<BR> goto
err_create_td_pool;<BR>
}<BR> <BR>
//创建uhci_qh的pool<BR> uhci->qh_pool =
dma_pool_create("uhci_qh",
uhci_dev(uhci),<BR>
sizeof(struct uhci_qh), 16, 0);<BR> if
(!uhci->qh_pool) {<BR>
dev_err(uhci_dev(uhci), "unable to create qh
dma_pool\n");<BR> goto
err_create_qh_pool;<BR>
}<BR> <BR> uhci->term_td =
uhci_alloc_td(uhci);<BR> if (!uhci->term_td)
{<BR> dev_err(uhci_dev(uhci),
"unable to allocate terminating
TD\n");<BR> goto
err_alloc_term_td;<BR>
}<BR>因为以后要经常分配TD和QH结构.为其建立一个POLL.最后,我们还可以看到.初始化了uhci->term_td<BR> <BR>
//创建11个skelqh<BR> for (i = 0; i < UHCI_NUM_SKELQH;
i++) {<BR> uhci->skelqh[i] =
uhci_alloc_qh(uhci, NULL,
NULL);<BR> if
(!uhci->skelqh[i])
{<BR>
dev_err(uhci_dev(uhci), "unable to allocate
QH\n");<BR>
goto err_alloc_skelqh;<BR>
}<BR> }<BR>初始化11个QH,即uhci->skeqh[
]数组<BR> /*<BR> * 8
Interrupt queues; link all higher int queues to int1 =
async<BR> */<BR>
//skel_async_qh = skelqh[9]<BR> for (i = SKEL_ISO
+ 1; i < SKEL_ASYNC; ++i)<BR>
uhci->skelqh[i]->link =
LINK_TO_QH(uhci->skel_async_qh);<BR>
//int1后面没有跟TD或者QH了<BR> uhci->skel_async_qh->link =
UHCI_PTR_TERM;<BR>然后uhci->skelqh[]的2到8项的后续指针都指向了skelqh[9].skelqh[9]指向了UHCI_PTR_TERM.<BR>其实uhci->skelqh[2]~
uhci->skelqh[9].代表8个时间间隔的调度队列.依次被称为int128,int64,int32,int16,int8,int4,int2,int1.即对于int128,即每隔128ms调度一次.int1.即每隔1ms调度一次,<BR>LINK_TO_QH定义如下:<BR>#define
LINK_TO_QH(qh) (UHCI_PTR_QH |
cpu_to_le32((qh)->dma_handle))<BR>UHCI_PTR_QH表示链接的是一个QH.然后加上QH的物理地址.相关的部份在UHCI
spec上都有详细的描述.请自行查阅有关定义.<BR>UHCI_PTR_TERM定义如下:<BR>#define
UHCI_PTR_TERM
__constant_cpu_to_le32(0x0001)<BR>即它的bit0 =1.表示” Empty Frame (pointer is
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