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[POWERPC] Add bootwrapper function to get virtual reg from the device tree.

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This patch adds a new generic device tree processing function that retrieves
virtual reg addresses from the device tree to the bootwrapper code. It also
updates the bootwrapper code to use the new function.

dt_get_virtual_reg() retrieves the virtual reg addresses from the
"virtual-reg" property. If the property can't be found, it uses the "reg"
property and walks the tree to translate it to absolute addresses.

Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Laurent Pinchart
2008-04-10 17:03:04 +02:00
committed by Kumar Gala
parent d464df2667
commit da0a5f0c65
5 changed files with 31 additions and 43 deletions
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20
arch/powerpc/boot/devtree.c
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@ -350,3 +350,23 @@ int dt_is_compatible(void *node, const char *compat)
return 0;
}
int dt_get_virtual_reg(void *node, void **addr, int nres)
{
unsigned long xaddr;
int n;
n = getprop(node, "virtual-reg", addr, nres * 4);
if (n > 0)
return n / 4;
for (n = 0; n < nres; n++) {
if (!dt_xlate_reg(node, n, &xaddr, NULL))
break;
addr[n] = (void *)xaddr;
}
return n;
}