xref: /kernel/linux/linux-5.10/arch/m68k/include/asm/mcfmmu.h

/*
 *	mcfmmu.h -- definitions for the ColdFire v4e MMU
 *
 *	(C) Copyright 2011,  Greg Ungerer <gerg@uclinux.org>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#ifndef	MCFMMU_H
#define	MCFMMU_H

/*
 *	The MMU support registers are mapped into the address space using
 *	the processor MMUBASE register. We used a fixed address for mapping,
 *	there doesn't seem any need to make this configurable yet.
 */
#define	MMUBASE		0xfe000000

/*
 *	The support registers of the MMU. Names are the sames as those
 *	used in the Freescale v4e documentation.
 */
#define	MMUCR		(MMUBASE + 0x00)	/* Control register */
#define	MMUOR		(MMUBASE + 0x04)	/* Operation register */
#define	MMUSR		(MMUBASE + 0x08)	/* Status register */
#define	MMUAR		(MMUBASE + 0x10)	/* TLB Address register */
#define	MMUTR		(MMUBASE + 0x14)	/* TLB Tag register */
#define	MMUDR		(MMUBASE + 0x18)	/* TLB Data register */

/*
 *	MMU Control register bit flags
 */
#define	MMUCR_EN	0x00000001		/* Virtual mode enable */
#define	MMUCR_ASM	0x00000002		/* Address space mode */

/*
 *	MMU Operation register.
 */
#define	MMUOR_UAA	0x00000001		/* Update allocation address */
#define	MMUOR_ACC	0x00000002		/* TLB access */
#define	MMUOR_RD	0x00000004		/* TLB access read */
#define	MMUOR_WR	0x00000000		/* TLB access write */
#define	MMUOR_ADR	0x00000008		/* TLB address select */
#define	MMUOR_ITLB	0x00000010		/* ITLB operation */
#define	MMUOR_CAS	0x00000020		/* Clear non-locked ASID TLBs */
#define	MMUOR_CNL	0x00000040		/* Clear non-locked TLBs */
#define	MMUOR_CA	0x00000080		/* Clear all TLBs */
#define	MMUOR_STLB	0x00000100		/* Search TLBs */
#define	MMUOR_AAN	16			/* TLB allocation address */
#define	MMUOR_AAMASK	0xffff0000		/* AA mask */

/*
 *	MMU Status register.
 */
#define	MMUSR_HIT	0x00000002		/* Search TLB hit */
#define	MMUSR_WF	0x00000008		/* Write access fault */
#define	MMUSR_RF	0x00000010		/* Read access fault */
#define	MMUSR_SPF	0x00000020		/* Supervisor protect fault */

/*
 *	MMU Read/Write Tag register.
 */
#define	MMUTR_V		0x00000001		/* Valid */
#define	MMUTR_SG	0x00000002		/* Shared global */
#define	MMUTR_IDN	2			/* Address Space ID */
#define	MMUTR_IDMASK	0x000003fc		/* ASID mask */
#define	MMUTR_VAN	10			/* Virtual Address */
#define	MMUTR_VAMASK	0xfffffc00		/* VA mask */

/*
 *	MMU Read/Write Data register.
 */
#define	MMUDR_LK	0x00000002		/* Lock entry */
#define	MMUDR_X		0x00000004		/* Execute access enable */
#define	MMUDR_W		0x00000008		/* Write access enable */
#define	MMUDR_R		0x00000010		/* Read access enable */
#define	MMUDR_SP	0x00000020		/* Supervisor access enable */
#define	MMUDR_CM_CWT	0x00000000		/* Cachable write thru */
#define	MMUDR_CM_CCB	0x00000040		/* Cachable copy back */
#define	MMUDR_CM_NCP	0x00000080		/* Non-cachable precise */
#define	MMUDR_CM_NCI	0x000000c0		/* Non-cachable imprecise */
#define	MMUDR_SZ_1MB	0x00000000		/* 1MB page size */
#define	MMUDR_SZ_4KB	0x00000100		/* 4kB page size */
#define	MMUDR_SZ_8KB	0x00000200		/* 8kB page size */
#define	MMUDR_SZ_1KB	0x00000300		/* 1kB page size */
#define	MMUDR_PAN	10			/* Physical address */
#define	MMUDR_PAMASK	0xfffffc00		/* PA mask */

#ifndef __ASSEMBLY__

/*
 *	Simple access functions for the MMU registers. Nothing fancy
 *	currently required, just simple 32bit access.
 */
static inline u32 mmu_read(u32 a)
{
	return *((volatile u32 *) a);
}

static inline void mmu_write(u32 a, u32 v)
{
	*((volatile u32 *) a) = v;
	__asm__ __volatile__ ("nop");
}

void cf_bootmem_alloc(void);
void cf_mmu_context_init(void);
int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word);

#endif

#endif	/* MCFMMU_H */