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
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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Linuxppc-embedded@ozlabs.org
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Thanks for your answer, unfortunately it doesn't work. I'm doing this :
static unsigned int *virtual_base = 0;
static unsigned long mem_addr = 0x70001e00;
static unsigned long mem_size = 0x100;
static unsigned int reg3 = 0;
static int __init gpio_init(void) {
printk("<1>gpio: init_module\n");
if(check_mem_region(mem_addr,mem_size))
{
printk("gpio: memory already in use\n");
return -EBUSY;
}
// request memory for the device
request_mem_region(mem_addr,mem_size,"gpio");
// remap
virtual_base = ioremap_nocache(mem_addr,mem_size);
printk("ioremap: Virtual Address %08x\n",(unsigned int)virtual_base);
printk("Physical Address %08x\n",(unsigned
int)virt_to_phys(virtual_base));
if( virtual_base==0 )
{
printk("ioremap failed\n");
return -EBUSY ;
}
else
{
reg3 = XIo_Out32(virtual_base);
printk("Result of GPIO_DATA = %08x\n",reg3) ;
reg3 = XIo_Out32(virtual_base+4);
printk("Result of GPIO_TRI = %08x\n",reg3) ;
printk("Xio_Out32\n");
XIo_Out32(virtual_base, 0x00);
}
return 0;
}
the result is :
gpio: init_module
ioremap: Virtual Address c500ee00
Physical Address 0500ee00
Xio_Out32
The LEDs stay ON. I find strange having physical address different from the
physical adress I wanted to map. Can I have a problem with my MMU ? As other
devices are working, I am not sure it's the MMU for exemple during boot :
eth0: Xilinx 10/100 EMAC at 0x80400000 mapped to 0xC5020000, irq=1 and
Ethernet is working so the MMU seems to be ok.
Thanks
Ludovic Desroches
2008/6/3 A. Nolson [off-list ref]:
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:
quoted
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
------------------------------------------------------------------------
_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
--
Ludovic Desroches
Ingénieur ESIEE 2008
mobile : 06 19 21 02 08
http://www.odulo.net