How accessing to my IP registers from Linux
A. Nolson
alohanono at gmail.com
Tue Jun 3 19:14:36 EST 2008
Hi,
I have recently developed a similar driver for that. Your IO memory
remapping should look like similar to this in your module_init:
-------
if ( (lcd_remap_address = (u32) ioremap(LCD_BASE, LCD_END - LCD_BASE
+1 )) == 0) {
printk(KERN_ERR "Couldn't ioremap memory at 0x%08lX\n",
(unsigned long) LCD_BASE);
return -EFAULT;
}
// Configure the IO as outputs
XIo_Out32(lcd_remap_address + 0x4,0x00);
-------
/A
Ludovic Desroches wrote:
>
> Hi,
>
>
>
> I have put xilinx kernel on my board : a memec FX12 based on a Virtex
> 4 FX. Everything thing is OK, I have my serial console, Ethernet is
> also OK.
>
> I have to make some drivers. For example one for the LCD screen. It is
> my first driver so I want to try with something easier like LEDs. I
> know there is a driver from Xilinx but I want to do it by myself.
> Moreover it is only a file to adapt Xilinx standelone driver for Kernel.
>
>
>
> I try to read and to write the registers of my GPIO IP which is
> working, I have made some tests in standelone. How accessing to these
> registers ?
>
> I have tried with this for example but without success :
>
> ptr = ioremap_nocache(0x70001e00,0x00000004);
> printk("GPIO_DATA (readl): %u\n",readl(ptr));
>
>
>
> readl, outl, ioread32 : same result.
>
>
>
> Thanks
>
>
>
> Best Regards
>
>
> --
> Ludovic Desroches
> Ingénieur ESIEE 2008
> mobile : 06 19 21 02 08
> http://www.odulo.net
> ------------------------------------------------------------------------
>
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