/******************************************************************************
*
* Copyright (C) 2014 - 2017 Xilinx, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
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******************************************************************************/
/*****************************************************************************/
/**
* @file xil_mpu.c
*
* This file provides APIs for enabling/disabling MPU and setting the memory
* attributes for sections, in the MPU translation table.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- ---------------------------------------------------
* 5.00  pkp  02/10/14 Initial version
* 6.2   mus  01/27/17 Updated to support IAR compiler
* 6.4   asa  08/16/17 Added many APIs for MPU access to make MPU usage
* 					  user-friendly. The APIs added are: Xil_UpdateMPUConfig,
* 					  Xil_GetMPUConfig, Xil_GetNumOfFreeRegions,
* 					  Xil_GetNextMPURegion, Xil_DisableMPURegionByRegNum,
* 					  Xil_GetMPUFreeRegMask, Xil_SetMPURegionByRegNum, and
* 					  Xil_InitializeExistingMPURegConfig.
* 					  Added a new array of structure of type XMpuConfig to
* 					  represent the MPU configuration table.
* </pre>
*
*
******************************************************************************/

/***************************** Include Files *********************************/

#include "xil_cache.h"
#include "xpseudo_asm.h"
#include "xil_types.h"
#include "xil_mpu.h"
#include "xdebug.h"
#include "xstatus.h"
/***************** Macros (Inline Functions) Definitions *********************/

/**************************** Type Definitions *******************************/

/************************** Constant Definitions *****************************/

/************************** Variable Definitions *****************************/

static const struct {
	u64 size;
	unsigned int encoding;
}region_size[] = {
	{ 0x20, REGION_32B },
	{ 0x40, REGION_64B },
	{ 0x80, REGION_128B },
	{ 0x100, REGION_256B },
	{ 0x200, REGION_512B },
	{ 0x400, REGION_1K },
	{ 0x800, REGION_2K },
	{ 0x1000, REGION_4K },
	{ 0x2000, REGION_8K },
	{ 0x4000, REGION_16K },
	{ 0x8000, REGION_32K },
	{ 0x10000, REGION_64K },
	{ 0x20000, REGION_128K },
	{ 0x40000, REGION_256K },
	{ 0x80000, REGION_512K },
	{ 0x100000, REGION_1M },
	{ 0x200000, REGION_2M },
	{ 0x400000, REGION_4M },
	{ 0x800000, REGION_8M },
	{ 0x1000000, REGION_16M },
	{ 0x2000000, REGION_32M },
	{ 0x4000000, REGION_64M },
	{ 0x8000000, REGION_128M },
	{ 0x10000000, REGION_256M },
	{ 0x20000000, REGION_512M },
	{ 0x40000000, REGION_1G },
	{ 0x80000000, REGION_2G },
	{ 0x100000000, REGION_4G },
};

XMpu_Config Mpu_Config;

/************************** Function Prototypes ******************************/
void Xil_InitializeExistingMPURegConfig(void);
/*****************************************************************************/
/**
* @brief    This function sets the memory attributes for a section covering
*           1MB, of memory in the translation table.
*
* @param	Addr: 32-bit address for which memory attributes need to be set.
* @param	attrib: Attribute for the given memory region.
* @return	None.
*
*
******************************************************************************/
void Xil_SetTlbAttributes(INTPTR addr, u32 attrib)
{
	INTPTR Localaddr = addr;
	Localaddr &= (~(0xFFFFFU));
	/* Setting the MPU region with given attribute with 1MB size */
	Xil_SetMPURegion(Localaddr, 0x100000, attrib);
}

/*****************************************************************************/
/**
* @brief    Set the memory attributes for a section of memory in the
*           translation table.
*
* @param	Addr: 32-bit address for which memory attributes need to be set..
* @param	size: size is the size of the region.
* @param	attrib: Attribute for the given memory region.
* @return	None.
*
*
******************************************************************************/
u32 Xil_SetMPURegion(INTPTR addr, u64 size, u32 attrib)
{
	u32 Regionsize = 0;
	INTPTR Localaddr = addr;
	u32 NextAvailableMemRegion;
	unsigned int i;

	NextAvailableMemRegion = Xil_GetNextMPURegion();
	if (NextAvailableMemRegion == 0xFF) {
		xdbg_printf(DEBUG, "No regions available\r\n");
		return XST_FAILURE;
	}

	Xil_DCacheFlush();
	Xil_ICacheInvalidate();

	mtcp(XREG_CP15_MPU_MEMORY_REG_NUMBER,NextAvailableMemRegion);
	isb();

	/* Lookup the size.  */
	for (i = 0; i < sizeof region_size / sizeof region_size[0]; i++) {
		if (size <= region_size[i].size) {
			Regionsize = region_size[i].encoding;
			break;
		}
	}

	Localaddr &= ~(region_size[i].size - 1);

	Regionsize <<= 1;
	Regionsize |= REGION_EN;
	dsb();
	mtcp(XREG_CP15_MPU_REG_BASEADDR, Localaddr);	/* Set base address of a region */
	mtcp(XREG_CP15_MPU_REG_ACCESS_CTRL, attrib);	/* Set the control attribute */
	mtcp(XREG_CP15_MPU_REG_SIZE_EN, Regionsize);	/* set the region size and enable it*/
	dsb();
	isb();
	Xil_UpdateMPUConfig(NextAvailableMemRegion, Localaddr, Regionsize, attrib);
	return XST_SUCCESS;
}
/*****************************************************************************/
/**
* @brief    Enable MPU for Cortex R5 processor. This function invalidates I
*           cache and flush the D Caches, and then enables the MPU.
*
*
* @param	None.
* @return	None.
*
******************************************************************************/
void Xil_EnableMPU(void)
{
	u32 CtrlReg, Reg;
	s32 DCacheStatus=0, ICacheStatus=0;
	/* enable caches only if they are disabled */
#if defined (__GNUC__)
	CtrlReg = mfcp(XREG_CP15_SYS_CONTROL);
#elif defined (__ICCARM__)
	mfcp(XREG_CP15_SYS_CONTROL,CtrlReg);
#endif
	if ((CtrlReg & XREG_CP15_CONTROL_C_BIT) != 0x00000000U) {
		DCacheStatus=1;
	}
	if ((CtrlReg & XREG_CP15_CONTROL_I_BIT) != 0x00000000U) {
		ICacheStatus=1;
	}

	if(DCacheStatus != 0) {
		Xil_DCacheDisable();
	}
	if(ICacheStatus != 0){
		Xil_ICacheDisable();
	}
#if defined (__GNUC__)
	Reg = mfcp(XREG_CP15_SYS_CONTROL);
#elif defined (__ICCARM__)
	 mfcp(XREG_CP15_SYS_CONTROL,Reg);
#endif
	Reg |= 0x00000001U;
	dsb();
	mtcp(XREG_CP15_SYS_CONTROL, Reg);
	isb();
	/* enable caches only if they are disabled in routine*/
	if(DCacheStatus != 0) {
		Xil_DCacheEnable();
	}
	if(ICacheStatus != 0) {
		Xil_ICacheEnable();
	}
}

/*****************************************************************************/
/**
* @brief    Disable MPU for Cortex R5 processors. This function invalidates I
*           cache and flush the D Caches, and then disabes the MPU.
*
* @param	None.
*
* @return	None.
*
******************************************************************************/
void Xil_DisableMPU(void)
{
	u32 CtrlReg, Reg;
	s32 DCacheStatus=0, ICacheStatus=0;
	/* enable caches only if they are disabled */

#if defined (__GNUC__)
	CtrlReg = mfcp(XREG_CP15_SYS_CONTROL);
#elif defined (__ICCARM__)
	mfcp(XREG_CP15_SYS_CONTROL,CtrlReg);
#endif
	if ((CtrlReg & XREG_CP15_CONTROL_C_BIT) != 0x00000000U) {
		DCacheStatus=1;
	}
	if ((CtrlReg & XREG_CP15_CONTROL_I_BIT) != 0x00000000U) {
		ICacheStatus=1;
	}

	if(DCacheStatus != 0) {
		Xil_DCacheDisable();
	}
	if(ICacheStatus != 0){
		Xil_ICacheDisable();
	}

	mtcp(XREG_CP15_INVAL_BRANCH_ARRAY, 0);
#if defined (__GNUC__)
	Reg = mfcp(XREG_CP15_SYS_CONTROL);
#elif defined (__ICCARM__)
	mfcp(XREG_CP15_SYS_CONTROL,Reg);
#endif
	Reg &= ~(0x00000001U);
	dsb();
	mtcp(XREG_CP15_SYS_CONTROL, Reg);
	isb();
	/* enable caches only if they are disabled in routine*/
	if(DCacheStatus != 0) {
		Xil_DCacheEnable();
	}
	if(ICacheStatus != 0) {
		Xil_ICacheEnable();
	}
}

/*****************************************************************************/
/**
* @brief    Update the MPU configuration for the requested region number in
* 			the global MPU configuration table.
*
* @param	reg_num: The requested region number to be updated information for.
* @param	address: 32 bit address for start of the region.
* @param	size: Requested size of the region.
* @param	attrib: Attribute for the corresponding region.
* @return	XST_FAILURE: When the requested region number if 16 or more.
* 			XST_SUCCESS: When the MPU configuration table is updated.
*
*
******************************************************************************/
u32 Xil_UpdateMPUConfig(u32 reg_num, INTPTR address, u32 size, u32 attrib)
{
	u32 ReturnVal = XST_SUCCESS;
	u32 Tempsize = size;
	u32 Index;

	if (reg_num >=  MAX_POSSIBLE_MPU_REGS) {
		xdbg_printf(DEBUG, "Invalid region number\r\n");
		ReturnVal = XST_FAILURE;
		goto exit;
	}

	if (size & REGION_EN) {
		Mpu_Config[reg_num].RegionStatus = MPU_REG_ENABLED;
		Mpu_Config[reg_num].BaseAddress = address;
		Tempsize &= (~REGION_EN);
		Tempsize >>= 1;
		/* Lookup the size.  */
		for (Index = 0; Index <
				sizeof region_size / sizeof region_size[0]; Index++) {
			if (Tempsize <= region_size[Index].encoding) {
				Mpu_Config[reg_num].Size = region_size[Index].size;
				break;
			}
		}
		Mpu_Config[reg_num].Attribute = attrib;
	} else {
		Mpu_Config[reg_num].RegionStatus = 0U;
		Mpu_Config[reg_num].BaseAddress = 0U;
		Mpu_Config[reg_num].Size = 0U;
		Mpu_Config[reg_num].Attribute = 0U;
	}

exit:
	return ReturnVal;
}

/*****************************************************************************/
/**
* @brief    The MPU configuration table is passed to the caller.
*
* @param	mpuconfig: This is of type XMpu_Config which is an array of
* 			16 entries of type structure representing the MPU config table
* @return	none
*
*
******************************************************************************/
void Xil_GetMPUConfig (XMpu_Config mpuconfig) {
	u32 Index = 0U;

	while (Index < MAX_POSSIBLE_MPU_REGS) {
		mpuconfig[Index].RegionStatus = Mpu_Config[Index].RegionStatus;
		mpuconfig[Index].BaseAddress = Mpu_Config[Index].BaseAddress;
		mpuconfig[Index].Attribute = Mpu_Config[Index].Attribute;
		mpuconfig[Index].Size = Mpu_Config[Index].Size;
		Index++;
	}
}

/*****************************************************************************/
/**
* @brief    Returns the total number of free MPU regions available.
*
* @param	none
* @return	Number of free regions available to users
*
*
******************************************************************************/
u32 Xil_GetNumOfFreeRegions (void) {
	u32 Index = 0U;
	int NumofFreeRegs = 0U;

	while (Index < MAX_POSSIBLE_MPU_REGS) {
		if (MPU_REG_DISABLED == Mpu_Config[Index].RegionStatus) {
			NumofFreeRegs++;
		}
		Index++;
	}
	return NumofFreeRegs;
}

/*****************************************************************************/
/**
* @brief    Returns the total number of free MPU regions available in the form
*           of a mask. A bit of 1 in the returned 16 bit value represents the
*           corresponding region number to be available.
*           For example, if this function returns 0xC0000, this would mean, the
*           regions 14 and 15 are available to users.
*
* @param	none
* @return	The free region mask as a 16 bit value
*
*
******************************************************************************/
u16 Xil_GetMPUFreeRegMask (void) {
	u32 Index = 0U;
	u16 FreeRegMask = 0U;

	while (Index < MAX_POSSIBLE_MPU_REGS) {
		if (MPU_REG_DISABLED == Mpu_Config[Index].RegionStatus) {
			FreeRegMask |= (1U << Index);
		}
		Index++;
	}
	return FreeRegMask;
}

/*****************************************************************************/
/**
* @brief    Disables the corresponding region number as passed by the user.
*
* @param	reg_num: The region number to be disabled
* @return	XST_SUCCESS: If the region could be disabled successfully
* 			XST_FAILURE: If the requested region number is 16 or more.
*
*
******************************************************************************/
u32 Xil_DisableMPURegionByRegNum (u32 reg_num) {
	u32 Temp = 0U;
	u32 ReturnVal = XST_FAILURE;

	if (reg_num >= 16U) {
		xdbg_printf(DEBUG, "Invalid region number\r\n");
		goto exit1;
	}
	Xil_DCacheFlush();
	Xil_ICacheInvalidate();

	mtcp(XREG_CP15_MPU_MEMORY_REG_NUMBER,reg_num);
#if defined (__GNUC__)
	Temp = mfcp(XREG_CP15_MPU_REG_SIZE_EN);
#elif defined (__ICCARM__)
	mfcp(XREG_CP15_MPU_REG_SIZE_EN,Temp);
#endif
	Temp &= (~REGION_EN);
	dsb();
	mtcp(XREG_CP15_MPU_REG_SIZE_EN,Temp);
	dsb();
	isb();
	Xil_UpdateMPUConfig(reg_num, 0U, 0U, 0U);
	ReturnVal = XST_SUCCESS;

exit1:
	return ReturnVal;
}

/*****************************************************************************/
/**
* @brief    Enables the corresponding region number as passed by the user.
*
* @param	reg_num: The region number to be enabled
* @param	address: 32 bit address for start of the region.
* @param	size: Requested size of the region.
* @param	attrib: Attribute for the corresponding region.
* @return	XST_SUCCESS: If the region could be created successfully
* 			XST_FAILURE: If the requested region number is 16 or more.
*
*
******************************************************************************/
u32 Xil_SetMPURegionByRegNum (u32 reg_num, INTPTR addr, u64 size, u32 attrib)
{
	u32 ReturnVal = XST_SUCCESS;
	INTPTR Localaddr = addr;
	u32 Regionsize = 0;
	u32 Index;

	if (reg_num >= 16U) {
		xdbg_printf(DEBUG, "Invalid region number\r\n");
		ReturnVal = XST_FAILURE;
		goto exit2;
	}

	if (Mpu_Config[reg_num].RegionStatus == MPU_REG_ENABLED) {
		xdbg_printf(DEBUG, "Region already enabled\r\n");
		ReturnVal = XST_FAILURE;
		goto exit2;
	}

	Xil_DCacheFlush();
	Xil_ICacheInvalidate();
	mtcp(XREG_CP15_MPU_MEMORY_REG_NUMBER,reg_num);
	isb();

	/* Lookup the size.  */
	for (Index = 0; Index <
			sizeof region_size / sizeof region_size[0]; Index++) {
		if (size <= region_size[Index].size) {
			Regionsize = region_size[Index].encoding;
			break;
		}
	}

	Localaddr &= ~(region_size[Index].size - 1);
	Regionsize <<= 1;
	Regionsize |= REGION_EN;
	dsb();
	mtcp(XREG_CP15_MPU_REG_BASEADDR, Localaddr);
	mtcp(XREG_CP15_MPU_REG_ACCESS_CTRL, attrib);
	mtcp(XREG_CP15_MPU_REG_SIZE_EN, Regionsize);
	dsb();
	isb();
	Xil_UpdateMPUConfig(reg_num, Localaddr, Regionsize, attrib);
exit2:
	return ReturnVal;

}

/*****************************************************************************/
/**
* @brief    Initializes the MPU configuration table that are setup in the
* 			R5 boot code in the Init_Mpu function called before C main.
*
* @param	none
* @return	none
*
*
******************************************************************************/
void Xil_InitializeExistingMPURegConfig(void)
{
	u32 Index = 0U;
	u32 Index1 = 0U;
	u32 MPURegSize;
	INTPTR MPURegBA;
	u32 MPURegAttrib;
	u32 Tempsize;

	while (Index < MAX_POSSIBLE_MPU_REGS) {
		mtcp(XREG_CP15_MPU_MEMORY_REG_NUMBER,Index);
#if defined (__GNUC__)
		MPURegSize = mfcp(XREG_CP15_MPU_REG_SIZE_EN);
		MPURegBA = mfcp(XREG_CP15_MPU_REG_BASEADDR);
		MPURegAttrib = mfcp(XREG_CP15_MPU_REG_ACCESS_CTRL);
#elif defined (__ICCARM__)
		mfcp(XREG_CP15_MPU_REG_SIZE_EN,MPURegSize);
		mfcp(XREG_CP15_MPU_REG_BASEADDR, MPURegBA);
		mfcp(XREG_CP15_MPU_REG_ACCESS_CTRL, MPURegAttrib);
#endif
		if (MPURegSize & REGION_EN) {
			Mpu_Config[Index].RegionStatus = MPU_REG_ENABLED;
			Mpu_Config[Index].BaseAddress = MPURegBA;
			Mpu_Config[Index].Attribute = MPURegAttrib;
			Tempsize = MPURegSize & (~REGION_EN);
			Tempsize >>= 1;
			for (Index1 = 0; Index1 <
				(sizeof (region_size) / sizeof (region_size[0])); Index1++) {
				if (Tempsize <= region_size[Index1].encoding) {
					Mpu_Config[Index].Size = region_size[Index1].size;
					break;
				}
			}
		}
		Index++;
	}
}

/*****************************************************************************/
/**
* @brief    Returns the next available free MPU region
*
* @param	none
* @return	The free MPU region available
*
*
******************************************************************************/
u32 Xil_GetNextMPURegion(void)
{
	u32 Index = 0U;
	u32 NextAvailableReg = 0xFF;
	while (Index < MAX_POSSIBLE_MPU_REGS) {
		if (Mpu_Config[Index].RegionStatus != MPU_REG_ENABLED) {
			NextAvailableReg = Index;
			break;
		}
		Index++;
	}
	return NextAvailableReg;
}