📄 linux resource, platform_device和驱动的关系 - fd的专栏 - csdnblog.htm
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target=_self>断水刀</A></LI></UL>
<H3 class=listtitle>存档</H3>
<UL class=list>
<LI><A
href="http://blog.csdn.net/wawuta/archive/2007/03.aspx">2007年03月(10)</A>
<LI><A
href="http://blog.csdn.net/wawuta/archive/2007/02.aspx">2007年02月(10)</A>
<LI><A
href="http://blog.csdn.net/wawuta/archive/2007/01.aspx">2007年01月(20)</A></LI></UL><SPAN
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<H3 class=listtitle>最近评论</H3>
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<LI class=listitem>shaw_xiao2006：<A title=点击查看《回复:PCLint》
href="http://blog.csdn.net/wawuta/archive/2007/01/24/1491826.aspx#545702">感觉说得不是很清晰哈</A>
<LI class=listitem>neowang：<A title=点击查看《回复:u-boot移植点滴记录》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#538057">另外,博主可否透露一下你的开发板的硬件配置,比如SDRAM,NOR
Flash和NAND Flash的大小和型号,还有地址分配?在不知道这些的情况下,我基本看不懂你对lowlevel_init.S文件的修改;-(</A>
<LI class=listitem>neowang：<A title=点击查看《回复:u-boot移植点滴记录》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#537880">非常感谢你的指点，我在U-Boot的邮件列表里面也搜到了相关的解释，原来-mabi选项是从GCC
4才开始出现的。</A>
<LI class=listitem>wawuta：<A title=点击查看《回复:u-boot移植点滴记录》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#537112">neowang,<BR>我刚刚贴了一篇关于APCS的文章你可以看看。
：）</A>
<LI class=listitem>wawuta：<A title=点击查看《回复:u-boot移植点滴记录》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#537105">错误：Invalid
option `abi=apcs-gnu'<BR>指示编译器不支持选项
-mabi=apcs-gnu<BR><BR>函数cc-option用于检查编译器是否支持给定的选项<BR>在PLATform_CPPFLAGS
+=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)中<BR>apcs:指的是 ARM
过程调用标准……</A></LI></UL></SPAN></SPAN><BR><BR></DIV>
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<P><FONT
color=#333333>首先你需要为SOC的各个功能部分定义他的一些资源.例如可用于访问的寄存器地址.中断号,DMA什么的。然后将这些资源(resource)
作为 platform 的dev
.通过platform_add_devices函数将你定义的paltform_device变量注册到系统的dev里面.。或者你可以象我这样将你需要的驱动添加:<BR>static
struct platform_device *smdk2410_devices[] __initdata =
{<BR>&s3c_device_usb,<BR>&s3c_device_lcd,<BR>&s3c_device_bl,<BR>&s3c_device_wdt,<BR>&s3c_device_i2c,<BR>&s3c_device_iis,<BR>&s3c_device_sdi,<BR>&s3c_device_adc,
<BR>&s3c_device_nand,<BR>&s3c_device_usbgadget,<BR>&s3c_device_ts,<BR>&s3c_device_buttons,<BR>&s3c_device_rtc,<BR>&s3c_device_spi0,<BR>&s3c_device_timer1,//add
by cefanty for battery charging<BR>};<BR>这样你的硬件的信息和资源就会注册到系统中.</FONT></P>
<P><FONT
color=#333333>说了半天，这回该说这有什么用了。<BR>你编写的驱动或者移植别人的驱动，一般在驱动里有这样的代码,例如:<BR>static
struct platform_driver s3c2410sdi_driver =<BR>{<BR>.probe
= s3c2410sdi_probe,<BR>.remove =
s3c2410sdi_remove,<BR>.suspend= s3c2410mci_suspend,<BR>.resume=
s3c2410mci_resume,<BR>.driver={<BR>.name= "s3c2410-sdi",<BR>.bus =
&platform_bus_type,<BR>.owner= THIS_MODULE,<BR>},<BR>};</FONT></P>
<P><FONT color=#333333>看到 .name=
"s3c2410-sdi",这条关键的语句没有??，它和我在上面注册的&s3c_device_sdi,里的device的名称是一致的.我这里展开我的s3c_device_sdi,的内容<BR>:<BR>/*
SDI */</FONT></P>
<P><FONT color=#333333>static struct resource s3c_sdi_resource[] = {<BR>[0] =
{<BR>.start = S3C2410_PA_SDI,<BR>.end = S3C2410_PA_SDI + S3C24XX_SZ_SDI -
1,<BR>.flags = IORESOURCE_MEM,<BR>},<BR>[1] = {<BR>.start = IRQ_SDI,<BR>.end
= IRQ_SDI,<BR>.flags = IORESOURCE_IRQ,<BR>},<BR>[2] = {<BR>.start =
3,<BR>.end = 3,<BR>.flags = IORESOURCE_DMA,<BR>}<BR>};</FONT></P>
<P><FONT color=#333333>struct platform_device s3c_device_sdi = {<BR>.name
= "s3c2410-sdi",<BR>.id = -1,<BR>.num_resources =
ARRAY_SIZE(s3c_sdi_resource),<BR>.resource =
s3c_sdi_resource,<BR>};</FONT></P>
<P><FONT color=#333333>在驱动程序里的init代码大致如下:<BR>static int __init
s3c2410sdi_init(void)<BR>{<BR>return
platform_driver_register(&s3c2410sdi_driver);<BR>}<BR>用platform_driver_register
向系统注册这个驱动程序.而这个函数会在s3c2410sdi_driver的信息里提取name为搜索内容，搜索系统注册的device中有没有这个
platform_device。 如果有注册，那么接着会执行platform_driver 里probe函数.在这里显然是s3c2410sdi_probe函数
在probe函数里，用的最多和刚才platform_device有关的语句是platform_get_resource,这条语句用于获取
platform_device里的resource资料.例如映射的IO地址,中断等.剩下等得就是ioremap,和
request_irq等的事情了</FONT></P> <BR><BR>
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