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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* MPU module for Cortex-M3 */
#ifndef __CROS_EC_MPU_H
#define __CROS_EC_MPU_H
#include "common.h"
#define MPU_TYPE REG32(0xe000ed90)
#define MPU_CTRL REG32(0xe000ed94)
#define MPU_NUMBER REG32(0xe000ed98)
#define MPU_BASE REG32(0xe000ed9c)
#define MPU_SIZE REG16(0xe000eda0)
#define MPU_ATTR REG16(0xe000eda2)
#define MPU_CTRL_PRIVDEFEN (1 << 2)
#define MPU_CTRL_HFNMIENA (1 << 1)
#define MPU_CTRL_ENABLE (1 << 0)
#define MPU_ATTR_NX (1 << 12)
#define MPU_ATTR_NOACCESS (0 << 8)
#define MPU_ATTR_FULLACCESS (3 << 8)
/* Suggested in table 3-6 of Stellaris LM4F232H5QC Datasheet and table 38 of
* STM32F10xxx Cortex-M3 programming manual for internal sram. */
#define MPU_ATTR_INTERNALSRAM 6
/**
* Configure a region
*
* region: Number of the region to update
* addr: Base address of the region
* size: Size of the region in bytes
* attr: Attribute of the region. Current value will be overwritten if enable
* is set.
* enable: Enables the region if non zero. Otherwise, disables the region.
*
* Returns EC_SUCCESS on success or EC_ERROR_INVAL if a parameter is invalid.
*/
int mpu_config_region(uint8_t region, uint32_t addr, uint32_t size,
uint16_t attr, uint8_t enable);
/**
* Set a region non-executable.
*
* region: number of the region
* addr: base address of the region
* size: size of the region in bytes
*/
int mpu_nx_region(uint8_t region, uint32_t addr, uint32_t size);
/**
* Enable MPU */
void mpu_enable(void);
/**
* Returns the value of MPU type register
*
* Bit fields:
* [15:8] Number of the data regions implemented or 0 if MPU is not present.
* [1] 0: unified (no distinction between instruction and data)
* 1: separated
*/
uint32_t mpu_get_type(void);
/* Location of iram.text */
extern char __iram_text_start;
extern char __iram_text_end;
/**
* Lock down RAM
*/
int mpu_protect_ram(void);
/**
* Initialize MPU.
* It disables all regions if MPU is implemented. Otherwise, returns
* EC_ERROR_UNIMPLEMENTED.
*/
int mpu_pre_init(void);
#endif /* __CROS_EC_MPU_H */
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