* How accessing to my IP registers from Linux
@ 2008-06-03 7:23 Ludovic Desroches
2008-06-03 9:14 ` A. Nolson
0 siblings, 1 reply; 3+ messages in thread
From: Ludovic Desroches @ 2008-06-03 7:23 UTC (permalink / raw)
To: linuxppc-embedded
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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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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: How accessing to my IP registers from Linux 2008-06-03 7:23 How accessing to my IP registers from Linux Ludovic Desroches @ 2008-06-03 9:14 ` A. Nolson 2008-06-03 10:05 ` Ludovic Desroches 0 siblings, 1 reply; 3+ messages in thread From: A. Nolson @ 2008-06-03 9:14 UTC (permalink / raw) To: Ludovic Desroches; +Cc: linuxppc-embedded 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 > ------------------------------------------------------------------------ > > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How accessing to my IP registers from Linux 2008-06-03 9:14 ` A. Nolson @ 2008-06-03 10:05 ` Ludovic Desroches 0 siblings, 0 replies; 3+ messages in thread From: Ludovic Desroches @ 2008-06-03 10:05 UTC (permalink / raw) To: A. Nolson; +Cc: linuxppc-embedded [-- Attachment #1: Type: text/plain, Size: 3638 bytes --] 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 <alohanono@gmail.com>: > 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 >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> 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 [-- Attachment #2: Type: text/html, Size: 5402 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
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