Re: interfacing FPGA to AT91RM9200

["Yanjun Luo" <yanjun.luo@xxxxxxxxx>]

Hi Manila,
You can use an oscilloscope to find if you write the data out to FPGA.The SMC's config depends on your hardware design, like width, 8 or 16 bit?the speed, the wait etc. Please get these parameters from your hardwareand FPGA engineer.
You can find some sample code from kernel, like board-dk.c in 2.6.21, /* Initialization of the Static Memory Controller for Chip Select 2 */ at91_sys_write(AT91_SMC_CSR(2), AT91_SMC_DBW_16   /* 16 bit */    | AT91_SMC_WSEN | AT91_SMC_NWS_(4) /* wait states */    | AT91_SMC_TDF_(1)   /* float time */ );
The code like this is enough, but you should change it according to yourhardware. Then you can use ioremap to get the address, and read/writethis address.
That's all, hope it's helpful.
Regards,Yanjun Luo.



----- Original Message ----- From: Manila GoelTo: yanjun.luoCc: linux-arm@xxxxxxxxxxxxxxxxxxxxxxxxxx: Wednesday, September 03, 2008 2:07 PMSubject: Re: interfacing FPGA to AT91RM9200




2008/8/14 yanjun.luo <yanjun.luo@xxxxxxxxx>
Hi Manila,
You can use EBI to connect to FPGA, note that at91rm9200only support 16 bit width, you should config SMC registers.
Then you need write a driver to communicate with FPGA or youcan operate with mmap from user space if you don't wanthigh performance.
Regards,Yanjun Luo.
 Hi Yanjun,As u hv suggested i hv configured EBI and SMC as under:
int __iomem *addPtr;        // probably should be volatile!#define BASE_ADDRESS 0x50000000AT91_SYS->EBI_CSA &= 0xffffffef;AT91_SYS->EBI_CFGR &= 0xfffffffe;    AT91_SYS->EBI_SMC2_CSR[4]=(AT91C_SMC2_NWS&0x01)|AT91C_SMC2_WSEN|AT91C_SMC2_BAT|AT91C_SMC2_DBW_16;addPtr=(int __iomem*)ioremap(BASE_ADDRESS,4);writew(data,addPtr);
but unable to communicate, any suggestions or changes need to be done.Or any body successfully done some thing for interfacing FPGA to at91rm9200. plz send some sample code.

ThanksManila






发件人： Manila Goel发送时间： 2008-08-14  12:48:17收件人： linux-arm@xxxxxxxxxxxxxxxxxxxxxx抄送：主题： interfacing FPGA to AT91RM9200

Hello All,I m wrking on at91rm9200 and  i hv to interface  fpga with this. how can iinterface it. Anyone done, plz help how should i proceed? i m new to this.thanksManila
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