Re: MPC8555CDS & CCSRBAR

Hi!

You might want to try that:

#include <asm/mpc85xx.h>
#include <immap_85xx.h>		/* see mail archives for complete mpc8540 version */
...

void foo(void)
{
	volatile ccsr_t *immap;
	phys_addr_t ccsrbar;

	ccsrbar=get_ccsrbar();
        immap=ioremap(ccsrbar,sizeof(ccsr_t));	/* is ioremap_nochache() the same on mpc85xx? */
        if (!immap) {
                printk(KERN_ALERT "Failed to ioremap CCSRBAR!\n");
                err = -EIO;
                goto out;
        }

	/* examples */
        printk(KERN_INFO "CCSRBAR addr        %.8lx\n",ccsrbar);
	printk(KERN_INFO "IMMAP addr          %p\n",immap);
	printk(KERN_INFO "BR0        %.8x\n",immap->im_lbc.br0);
	printk(KERN_INFO "OR0        %.8x\n",immap->im_lbc.or0);

	/* unmap the ccsr*/
	iounmap(immap);
out:
}

I hope that's all current code.
Comments are welcome.

Greets,

Clemens Koller
_______________________________
R&D Imaging Devices
Anagramm GmbH
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Germany

http://www.anagramm.de
Phone: +49-89-741518-50
Fax: +49-89-741518-19


Gerhard Jaeger wrote:

On Tuesday 09 August 2005 16:04, Eric Kampman wrote:

quoted

Trying to port an SEC driver to Linux/PPC8555. Reading
the default CCSRBAR @ 0xFF700000 I read 0xFFFFFFFF
which is wrong. Looking at Metrowerks init files and
uboot code (1.1.2) I see it's likely been moved to
0xE0000000, but I get a seg fault when I try to read
there. 

So, what am I doing wrong, and even better, how do I
at runtime find out where CCSRBAR is? Thanks in
advance, and please forgive the likely ignorance, 

Eric

use the get_ccsrbar() function to get the address, then ioremap()
will be your friend ;)

HTH
Gerhard