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Commit eaa38d63 authored by James Hogan's avatar James Hogan Committed by Paul Burton
Browse files

MIPS: tlb-r4k: Add CPU PM callback to reconfigure TLB



Add a CPU power management callback for the r4k TLB which reconfigures
it after the CPU leaves a powered down state.

Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
parent 61d73044
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+33 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 2002 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/cpu_pm.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
@@ -421,7 +422,10 @@ static int __init set_ntlb(char *str)

__setup("ntlb=", set_ntlb);

void tlb_init(void)
/*
 * Configure TLB (for init or after a CPU has been powered off).
 */
static void r4k_tlb_configure(void)
{
	/*
	 * You should never change this register:
@@ -453,6 +457,11 @@ void tlb_init(void)
	local_flush_tlb_all();

	/* Did I tell you that ARC SUCKS?  */
}

void tlb_init(void)
{
	r4k_tlb_configure();

	if (ntlb) {
		if (ntlb > 1 && ntlb <= current_cpu_data.tlbsize) {
@@ -466,3 +475,26 @@ void tlb_init(void)

	build_tlb_refill_handler();
}

static int r4k_tlb_pm_notifier(struct notifier_block *self, unsigned long cmd,
			       void *v)
{
	switch (cmd) {
	case CPU_PM_ENTER_FAILED:
	case CPU_PM_EXIT:
		r4k_tlb_configure();
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block r4k_tlb_pm_notifier_block = {
	.notifier_call = r4k_tlb_pm_notifier,
};

static int __init r4k_tlb_init_pm(void)
{
	return cpu_pm_register_notifier(&r4k_tlb_pm_notifier_block);
}
arch_initcall(r4k_tlb_init_pm);