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

arch/mips/mm/tlb-r4k.c

+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);