Re: How accessing to my IP registers from Linux

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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