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MIPS: c-r4k: Add CPU PM callback for coherency 

Implement a CPU power management callback for the r4k cache, to set up
coherency again after leaving a powered down state.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
James Hogan 2014-03-04 10:23:57 +00:00 committed by Paul Burton
parent ae4ce45419
commit 61d73044fe
1 changed files with 24 additions and 0 deletions
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24
arch/mips/mm/c-r4k.c
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@ -7,6 +7,7 @@
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/cpu_pm.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/highmem.h>
@ -1644,3 +1645,26 @@ void r4k_cache_init(void)
coherency_setup();
board_cache_error_setup = r4k_cache_error_setup;
}
static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
void *v)
{
switch (cmd) {
case CPU_PM_ENTER_FAILED:
case CPU_PM_EXIT:
coherency_setup();
break;
}
return NOTIFY_OK;
}
static struct notifier_block r4k_cache_pm_notifier_block = {
.notifier_call = r4k_cache_pm_notifier,
};
int __init r4k_cache_init_pm(void)
{
return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
}
arch_initcall(r4k_cache_init_pm);