📄 linux设备驱动之usb主机控制器驱动分析-(5)_linux技术文章_linux_操作系统5.htm
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UHCI_USBCMD_HCRESET)<BR>
dev_warn(&pdev->dev, "HCRESET not completed
yet!\n");<BR> <BR> /* Just to be safe, disable
interrupt requests and<BR> * make sure the
controller is stopped.<BR>
*/<BR> outw(0, base +
UHCI_USBINTR);<BR> outw(0, base +
UHCI_USBCMD);<BR>}<BR>重启OHCI的步骤如下:<BR>1:将UHCI_USBLEGSUP寄存器中的,RWC属性位清空.<BR>RWC属性即为:该位可读可写.如果往该位写1,就会将该位清0.如果写0则什么都不干.上面代码的操作也就是将RWC位置为0.代码的注释上说的很清楚了.这样会禁用PIRQ和SMI.当然也会关掉Legacy设备的支持.<BR>2:往USB
CMD寄存器写入UHCI_USBCMD_HCRESET.用来重启UHCI.<BR>UHCI重启完了之后,又会将该位清空<BR>3:清空USB
INTR寄存器和CMD寄存器<BR>对于重启UHCI的情况,返回到check_and_reset_hc()里,还会调用finish_reset().代码如下:<BR>static
void finish_reset(struct uhci_hcd *uhci)<BR>{<BR> int
port;<BR> <BR> /* HCRESET doesn't affect the
Suspend, Reset, and Resume Detect<BR> * bits in
the port status and control registers.<BR> * We
have to clear them by hand.<BR>
*/<BR> for (port = 0; port <
uhci->rh_numports;
++port)<BR> outw(0,
uhci->io_addr + USBPORTSC1 + (port *
2));<BR> <BR> uhci->port_c_suspend =
uhci->resuming_ports = 0;<BR> uhci->rh_state =
UHCI_RH_RESET;<BR> uhci->is_stopped =
UHCI_IS_STOPPED;<BR> uhci_to_hcd(uhci)->state =
HC_STATE_HALT;<BR> uhci_to_hcd(uhci)->poll_rh =
0;<BR> <BR> uhci->dead =
0; /* Full reset resurrects the
controller */<BR>}<BR>该函数将UHCI
的各个PORTSC寄存器全部清空.然后设置UHCI为RESET状态.HCD为HALT状态等等.<BR> <BR>2.3:hcd->driver->start(
)的操作<BR>将UHCI重启之后,注册好了中断处理函数就可以启动UHCI了.对应的接口为uhci_start().在分析代码之前,先来了解一下UHCI的调度架构.<BR>从UHCI的spec中摘出一个图,先看下UHCI调度的大概情况:<BR> <BR><IMG
src="linux设备驱动之USB主机控制器驱动分析-(5)_Linux技术文章_Linux_操作系统5.files/080909094316.jpg"
width=500 onload="javascript:if(this.width>500)this.width=500;"
border=0><BR> <BR>从该图中可以看出:<BR>图中的Frame List,翻译成中文叫框架表.TD表示Transfer
Descriptor,即表示一次具体的传输.QH表示Queue
Head.即传输队列.由上图可见.QH可以和其它的QH组成队列.QH下面又可以挂上TD链.<BR>在UHCI内部.有一个Frame List Address
Base Register(FLAB).用来存放Frame List的基地址和当前执行的Frame List序号.每过1ms.
FLAB中的index段会加1.它总共占10位,当增加到1023时,又会回转到0.UHCI根据FLAB中存放的Frame
list地址,以Index为序号执行Frame
List的相关项.<BR>由此可以看到.如果我们要UHCI往设备发送信息.只要将数据打成TD格式的,然后将其链入到相关QH或者TD就好.<BR>从上图中也可以看到传送的优先级关系.先是ISO.然后是INTERRUPT.最后是CONTRL和BULK.关于这四种传输,请自行参照USB2.0
spec.<BR>现在结合代码进行分析,如果代码较长,采用分段分析的方式:<BR>static int uhci_start(struct usb_hcd
*hcd)<BR>{<BR> struct uhci_hcd *uhci =
hcd_to_uhci(hcd);<BR> int retval =
-EBUSY;<BR> int i;<BR> struct
dentry *dentry;<BR> <BR> hcd->uses_new_polling =
1;<BR> <BR>
spin_lock_init(&uhci->lock);<BR>
setup_timer(&uhci->fsbr_timer,
uhci_fsbr_timeout,<BR>
(unsigned long) uhci);<BR>
INIT_LIST_HEAD(&uhci->idle_qh_list);<BR>
init_waitqueue_head(&uhci->waitqh);<BR> <BR>
if (DEBUG_CONFIGURED) {<BR>
dentry =
debugfs_create_file(hcd->self.bus_name,<BR>
S_IFREG|S_IRUGO|S_IWUSR,
uhci_debugfs_root,<BR>
uhci,
&uhci_debug_operations);<BR>
if (!dentry)
{<BR>
dev_err(uhci_dev(uhci), "couldn't create uhci
"<BR>
"debugfs
entry\n");<BR>
retval =
-ENOMEM;<BR>
goto err_</P>
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