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powerpc/5200: fix oops during going to standby 

When going to standby mode mpc code maps the whole soc5200 node
to access warious MBAR registers. However as of_iomap uses 'reg'
property of device node, only small part of MBAR is getting mapped.
Thus pm code gets oops when trying to access high parts of MBAR.
As a way to overcome this, make mpc52xx_pm_prepare() explicitly
map whole MBAR (0xc0000).

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Dmitry Baryshkov 2010-06-11 01:52:35 +00:00 committed by Grant Likely
parent a2c9a603c7
commit fb73538e10
1 changed files with 10 additions and 1 deletions
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11
arch/powerpc/platforms/52xx/mpc52xx_pm.c
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@ -64,10 +64,19 @@ int mpc52xx_pm_prepare(void)
{ .type = "builtin", .compatible = "mpc5200", }, /* efika */
{}
};
struct resource res;
/* map the whole register space */
np = of_find_matching_node(NULL, immr_ids);
mbar = of_iomap(np, 0);
if (of_address_to_resource(np, 0, &res)) {
pr_err("mpc52xx_pm_prepare(): could not get IMMR address\n");
of_node_put(np);
return -ENOSYS;
}
mbar = ioremap(res.start, 0xc000); /* we should map whole region including SRAM */
of_node_put(np);
if (!mbar) {
pr_err("mpc52xx_pm_prepare(): could not map registers\n");