oleavr-rgl-a500-mini-linux-3.10/drivers/soc/allwinner/pm_legacy/mem_mmu_pc.c

/*
 * Copyright (c) 2007-2017 Allwinnertech Co., Ltd.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/power/aw_pm.h>
#include "pm_types.h"
#include "./pm.h"

void save_mmu_state(struct mmu_state *saved_mmu_state)
{
	/* CR0 */
	asm volatile ("mrc p15, 2, %0, c0, c0, 0" : "=r" (saved_mmu_state->cssr));
	/* CR1 */
	asm volatile ("mrc p15, 0, %0, c1, c0, 2" : "=r" (saved_mmu_state->cacr));

	/* CR3 */
	asm volatile ("mrc p15, 0, %0, c3, c0, 0" : "=r" (saved_mmu_state->dacr));

	/* save ttb */
	/* CR2 */
	/* busy_waiting(); */
	asm volatile ("mrc p15, 0, %0, c2, c0, 0" : "=r"
		      (saved_mmu_state->ttb_0r));
	asm volatile ("mrc p15, 0, %0, c2, c0, 1" : "=r"
		      (saved_mmu_state->ttb_1r));
	asm volatile ("mrc p15, 0, %0, c2, c0, 2" : "=r"
		      (saved_mmu_state->ttbcr));
	/* CR1 */
	/* busy_waiting(); */
	asm volatile ("mrc p15, 0, %0, c1, c0, 0" : "=r" (saved_mmu_state->cr));	/* will effect visible addr space */

	return;
}
void restore_secure_mmu_state(struct mmu_state *saved_mmu_state)
{

	/* busy_waiting(); */
	/* CR0 */
	asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (saved_mmu_state->cssr));
	/* CR1 */
	asm volatile ("mcr p15, 0, %0, c1, c0, 2" : : "r" (saved_mmu_state->cacr));
	/* CR3 */
	asm volatile ("mcr p15, 0, %0, c3, c0, 0" : : "r" (saved_mmu_state->dacr));

	/* CR2 */
	/*when translate 0x0000,0000, use ttb0, while ttb0 shoudbe the same with ttb1 */
	asm volatile ("mcr p15, 0, %0, c2, c0, 0" : : "r"
		      (saved_mmu_state->ttb_0r));
	asm volatile ("mcr p15, 0, %0, c2, c0, 1" : : "r"
		      (saved_mmu_state->ttb_1r));
	asm volatile ("mcr p15, 0, %0, c2, c0, 2" : : "r"
		      (saved_mmu_state->ttbcr));

	/* CR1 */
	/*cr: will effect visible addr space */
#ifndef CONFIG_SUNXI_TRUSTZONE
	asm volatile ("mcr p15, 0, %0, c1, c0, 0" : : "r" (saved_mmu_state->cr));
#endif
	/*read id reg */
	asm volatile ("mrc p15, 0, r3, c0, c0, 0" : : );
	asm("mov r3, r3");
	asm("mov r3, r3");
	asm("isb");
	return;
}
void restore_mmu_state(struct mmu_state *saved_mmu_state)
{

	/* busy_waiting(); */
	/* CR0 */
	asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (saved_mmu_state->cssr));
	/* CR1 */
	asm volatile ("mcr p15, 0, %0, c1, c0, 2" : : "r" (saved_mmu_state->cacr));
	/* CR3 */
	asm volatile ("mcr p15, 0, %0, c3, c0, 0" : : "r" (saved_mmu_state->dacr));

	/* CR2 */
	/*when translate 0x0000,0000, use ttb0, while ttb0 shoudbe the same with ttb1 */
	asm volatile ("mcr p15, 0, %0, c2, c0, 0" : : "r"
		      (saved_mmu_state->ttb_1r));
	asm volatile ("mcr p15, 0, %0, c2, c0, 1" : : "r"
		      (saved_mmu_state->ttb_1r));
	asm volatile ("mcr p15, 0, %0, c2, c0, 2" : : "r"
		      (saved_mmu_state->ttbcr));
	asm("b __turn_mmu_on");
	asm(".align 5");
	asm(".type __turn_mmu_on, %function");
	asm("__turn_mmu_on:");
	asm("mov r0, r0");

	/* CR1 */
	/*cr: will effect visible addr space */
	asm volatile ("mcr p15, 0, %0, c1, c0, 0" : : "r" (saved_mmu_state->cr));
	/*read id reg */
	asm volatile ("mrc p15, 0, r3, c0, c0, 0" : : );
	asm("mov r3, r3");
	asm("mov r3, r3");
	asm("isb");
	return;
}

#if 0
void disable_mmu(void)
{
	__u32 c1format = 0;

	asm volatile ("mrc p15,0,%0,c1,c0,0" : "=r" (c1format) : );
	c1format &= ~0x1007;
	c1format |= 0;
	asm volatile ("mcr p15,0,%0,c1,c0,0" : : "r" (c1format));

	/*read id reg */
	asm volatile ("mrc p15, 0, r3, c0, c0, 0" : : );
	asm("mov r3, r3");
	asm("mov r3, r3");
	asm("isb");

	return;
}
#endif

/*  */
/* void jump_to_resume(void* pointer) */
/* { */
/*       asm("mov lr, r0"); */
/*       asm("mov pc, lr"); */
/*       return; */
/* } */