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[POWERPC] Define of_read_ulong helper

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There are various places where we want to extract an unsigned long
value from a device-tree property that can be 1 or 2 cells in length.
This replaces some open-coded calculations, and one place where we
assumed without checking that properties were the length we wanted,
with a little of_read_ulong() helper.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras
2006-09-19 14:06:27 +10:00
parent 19e59df4dc
commit a4dc7ff089
4 changed files with 22 additions and 26 deletions
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19
arch/powerpc/kernel/prom.c
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@@ -757,24 +757,9 @@ static int __init early_init_dt_scan_root(unsigned long node,
static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
{
cell_t *p = *cellp;
unsigned long r;
/* Ignore more than 2 cells */
while (s > sizeof(unsigned long) / 4) {
p++;
s--;
}
r = *p++;
#ifdef CONFIG_PPC64
if (s > 1) {
r <<= 32;
r |= *(p++);
s--;
}
#endif
*cellp = p;
return r;
*cellp = p + s;
return of_read_ulong(p, s);
}