/*
 * Copyright 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#ifndef __ASM_MMU_H
#define __ASM_MMU_H

#include <asm/system.h>

#define MMU_L1_TYPE         0x03  /* Descriptor type */
#define MMU_L1_TYPE_Fault   0x00  /* Invalid */
#define MMU_L1_TYPE_Page    0x11  /* Individual page mapping */
#define MMU_L1_TYPE_Section 0x12  /* Mapping for 1M segment */

#define MMU_L2_TYPE         0x03  /* Descriptor type */
#define MMU_L2_TYPE_Fault   0x00  /* Invalid data */
#define MMU_L2_TYPE_Large   0x01  /* Large page (64K) */
#define MMU_L2_TYPE_Small   0x02  /* Small page (4K) */

#define MMU_Bufferable      0x04  /* Data can use write-buffer */
#define MMU_Cacheable       0x08  /* Data can use cache */

#define MMU_AP_Limited     0x000  /* Limited access */
#define MMU_AP_Supervisor  0x400  /* Supervisor RW, User none */
#define MMU_AP_UserRead    0x800  /* Supervisor RW, User read only */
#define MMU_AP_Any         0xC00  /* Supervisor RW, User RW */

#define MMU_AP_ap0_Any     0x030
#define MMU_AP_ap1_Any     0x0C0
#define MMU_AP_ap2_Any     0x300
#define MMU_AP_ap3_Any     0xC00
#define MMU_AP_All (MMU_AP_ap0_Any|MMU_AP_ap1_Any|MMU_AP_ap2_Any|MMU_AP_ap3_Any)

#define MMU_DOMAIN(x)      ((x)<<5)

#define MMU_PAGE_SIZE      0x1000
#define MMU_SECTION_SIZE   0x100000

#define MMU_CP               p15      /* Co-processor ID */
#define MMU_Control          c1       /* Control register */
#define MMU_Base             c2       /* Page tables base */
#define MMU_DomainAccess     c3       /* Domain access control */
#define MMU_FaultStatus      c5       /* Fault status register */
#define MMU_FaultAddress     c6       /* Fault Address */
#define MMU_InvalidateCache  c7       /* Invalidate cache data */
#define MMU_TLB              c8       /* Translation Lookaside Buffer */

/* These seem to be 710 specific */
#define MMU_FlushTLB         c5
#define MMU_FlushIDC         c7

#define MMU_Control_M  0x001    /* Enable MMU */
#define MMU_Control_A  0x002    /* Enable address alignment faults */
#define MMU_Control_C  0x004    /* Enable cache */
#define MMU_Control_W  0x008    /* Enable write-buffer */
#define MMU_Control_P  0x010    /* Compatability: 32 bit code */
#define MMU_Control_D  0x020    /* Compatability: 32 bit data */
#define MMU_Control_L  0x040    /* Compatability: */
#define MMU_Control_B  0x080    /* Enable Big-Endian */
#define MMU_Control_S  0x100    /* Enable system protection */
#define MMU_Control_R  0x200    /* Enable ROM protection */
#define MMU_Control_I  0x1000   /* Enable Instruction cache */
#define MMU_Control_X  0x2000   /* Set interrupt vectors at 0xFFFF0000 */
#define MMU_Control_Init (MMU_Control_P|MMU_Control_D|MMU_Control_L)

/* Extras for some newer versions eg. ARM920 with architecture version 4. */
#define MMU_Control_F  0x400    /* IMPLEMENTATION DEFINED */
#define MMU_Control_Z  0x800    /* Enable branch predicion */
#define MMU_Control_RR 0x4000   /* Select non-random cache replacement */

#ifdef	CONFIG_ARCH_MMU

#define MMU_ON()	\
	{	\
	unsigned long cr = 0;	\
	asm volatile ("mrc p15, 0, %0, c1, c0;" : "=r"(cr) : /*:*/);	\
	cr |= (CR_M | CR_A | CR_C | CR_Z);	\
	asm volatile ("mcr p15, 0, %0, c1, c0;" : : "r"(cr) /*:*/);	\
	/* Clean instruction pipeline */	\
	asm volatile (	\
		"b skip;"	\
		"nop;"	\
		"nop;"	\
		"nop;"	\
		"skip:"	\
	);	\
	}

#define MMU_OFF()	\
	{	\
	unsigned long cr = 0;	\
	asm volatile ("mrc p15, 0, %0, c1, c0;" : "=r"(cr) /*: :*/);	\
	cr &= (~(CR_M | CR_A | CR_C | CR_I));	\
	asm volatile ("mcr p15, 0, %0, c1, c0;" : : "r"(cr) /*:*/);	\
	asm volatile (	\
		"nop;" /* flush i+d-TLBs */      \
		"nop;" /* flush i+d-TLBs */      \
		"nop;" /* flush i+d-TLBs */	\
	);	\
	}

#else

#define MMU_ON()
#define MMU_OFF()

#endif

#endif