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ARM: mvebu: improve PMSU driver to request its resource 

Until now, the PMSU driver was using of_iomap() to map its registers,
but of_iomap() doesn't call request_mem_region(). This commit fixes
the memory mapping code of the PMSU to do so, which will also be
useful for a later commit since we will need to adjust the resource
base address and size for Device Tree backward compatibility.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483433-25836-4-git-send-email-thomas.petazzoni@free-electrons.com
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thomas Petazzoni 2014-04-14 15:50:30 +02:00 committed by Jason Cooper
parent 49754ffef5
commit bd045a1ebb
1 changed files with 31 additions and 5 deletions
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36
arch/arm/mach-mvebu/pmsu.c
View File

@ -16,6 +16,8 @@
* other SOC units
*/
#define pr_fmt(fmt) "mvebu-pmsu: " fmt
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_address.h>
@ -63,15 +65,39 @@ int armada_xp_boot_cpu(unsigned int cpu_id, void *boot_addr)
static int __init armada_370_xp_pmsu_init(void)
{
struct device_node *np;
struct resource res;
int ret = 0;
np = of_find_matching_node(NULL, of_pmsu_table);
if (np) {
pr_info("Initializing Power Management Service Unit\n");
pmsu_mp_base = of_iomap(np, 0);
of_node_put(np);
if (!np)
return 0;
pr_info("Initializing Power Management Service Unit\n");
if (of_address_to_resource(np, 0, &res)) {
pr_err("unable to get resource\n");
ret = -ENOENT;
goto out;
}
return 0;
if (!request_mem_region(res.start, resource_size(&res),
np->full_name)) {
pr_err("unable to request region\n");
ret = -EBUSY;
goto out;
}
pmsu_mp_base = ioremap(res.start, resource_size(&res));
if (!pmsu_mp_base) {
pr_err("unable to map registers\n");
release_mem_region(res.start, resource_size(&res));
ret = -ENOMEM;
goto out;
}
out:
of_node_put(np);
return ret;
}
early_initcall(armada_370_xp_pmsu_init);