?? linux resource, platform_device和驅(qū)動(dòng)的關(guān)系 - fd的專欄 - csdnblog.htm
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target=_self>斷水刀</A></LI></UL>
<H3 class=listtitle>存檔</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>最近評(píng)論</H3>
<UL class=list>
<LI class=listitem>shaw_xiao2006：<A title=點(diǎn)擊查看《回復(fù):PCLint》
href="http://blog.csdn.net/wawuta/archive/2007/01/24/1491826.aspx#545702">感覺(jué)說(shuō)得不是很清晰哈</A>
<LI class=listitem>neowang：<A title=點(diǎn)擊查看《回復(fù):u-boot移植點(diǎn)滴記錄》
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開發(fā)板的硬件配置,比如SDRAM,NOR
Flash和NAND Flash的大小和型號(hào),還有地址分配?在不知道這些的情況下,我基本看不懂你對(duì)lowlevel_init.S文件的修改;-(</A>
<LI class=listitem>neowang：<A title=點(diǎn)擊查看《回復(fù):u-boot移植點(diǎn)滴記錄》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#537880">非常感謝你的指點(diǎn)，我在U-Boot的郵件列表里面也搜到了相關(guān)的解釋，原來(lái)-mabi選項(xiàng)是從GCC
4才開始出現(xiàn)的。</A>
<LI class=listitem>wawuta：<A title=點(diǎn)擊查看《回復(fù):u-boot移植點(diǎn)滴記錄》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#537112">neowang,<BR>我剛剛貼了一篇關(guān)于APCS的文章你可以看看。
：）</A>
<LI class=listitem>wawuta：<A title=點(diǎn)擊查看《回復(fù):u-boot移植點(diǎn)滴記錄》
href="http://blog.csdn.net/wawuta/archive/2007/01/23/1491520.aspx#537105">錯(cuò)誤：Invalid
option `abi=apcs-gnu'<BR>指示編譯器不支持選項(xiàng)
-mabi=apcs-gnu<BR><BR>函數(shù)cc-option用于檢查編譯器是否支持給定的選項(xiàng)<BR>在PLATform_CPPFLAGS
+=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)中<BR>apcs:指的是 ARM
過(guò)程調(diào)用標(biāo)準(zhǔn)……</A></LI></UL></SPAN></SPAN><BR><BR></DIV>
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<P><FONT
color=#333333>首先你需要為SOC的各個(gè)功能部分定義他的一些資源.例如可用于訪問(wèn)的寄存器地址.中斷號(hào),DMA什么的。然后將這些資源(resource)
作為 platform 的dev
.通過(guò)platform_add_devices函數(shù)將你定義的paltform_device變量注冊(cè)到系統(tǒng)的dev里面.?；蛘吣憧梢韵笪疫@樣將你需要的驅(qū)動(dòng)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>這樣你的硬件的信息和資源就會(huì)注冊(cè)到系統(tǒng)中.</FONT></P>
<P><FONT
color=#333333>說(shuō)了半天，這回該說(shuō)這有什么用了。<BR>你編寫的驅(qū)動(dòng)或者移植別人的驅(qū)動(dòng)，一般在驅(qū)動(dòng)里有這樣的代碼,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",這條關(guān)鍵的語(yǔ)句沒(méi)有??，它和我在上面注冊(cè)的&s3c_device_sdi,里的device的名稱是一致的.我這里展開我的s3c_device_sdi,的內(nèi)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>在驅(qū)動(dòng)程序里的init代碼大致如下:<BR>static int __init
s3c2410sdi_init(void)<BR>{<BR>return
platform_driver_register(&s3c2410sdi_driver);<BR>}<BR>用platform_driver_register
向系統(tǒng)注冊(cè)這個(gè)驅(qū)動(dòng)程序.而這個(gè)函數(shù)會(huì)在s3c2410sdi_driver的信息里提取name為搜索內(nèi)容，搜索系統(tǒng)注冊(cè)的device中有沒(méi)有這個(gè)
platform_device。 如果有注冊(cè)，那么接著會(huì)執(zhí)行platform_driver 里probe函數(shù).在這里顯然是s3c2410sdi_probe函數(shù)
在probe函數(shù)里，用的最多和剛才platform_device有關(guān)的語(yǔ)句是platform_get_resource,這條語(yǔ)句用于獲取
platform_device里的resource資料.例如映射的IO地址,中斷等.剩下等得就是ioremap,和
request_irq等的事情了</FONT></P> <BR><BR>
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