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34fa9b2177
The M54[78]x ColdFire parts are not the only members of the ColdFire family that have an MMU. But currently some of the early MMU initialization code is inside the startup code specific to only the ColdFire M54[78]x parts. Move that early ColdFire MMU init code so that it is run for other ColdFire parts running with MMU enabled. Specifically this means that the MMU initialization code will now also be run for the ColdFire M5441x parts when running with MMU enabled. The code move meant that the extern definition for the mmu_context_init() function had to be moved as well. To make it clear that is ColdFire specific I have renamed that with a "cf_" in front of it and put its extern definition in the mcfmmu.h (which is already included by the setup code). Reported-by: Angelo Dureghello <angelo@sysam.it> Tested-by: Angelo Dureghello <angelo@sysam.it> Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/*
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* mcfmmu.h -- definitions for the ColdFire v4e MMU
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*
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* (C) Copyright 2011, Greg Ungerer <gerg@uclinux.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef MCFMMU_H
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#define MCFMMU_H
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/*
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* The MMU support registers are mapped into the address space using
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* the processor MMUBASE register. We used a fixed address for mapping,
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* there doesn't seem any need to make this configurable yet.
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*/
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#define MMUBASE 0xfe000000
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/*
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* The support registers of the MMU. Names are the sames as those
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* used in the Freescale v4e documentation.
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*/
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#define MMUCR (MMUBASE + 0x00) /* Control register */
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#define MMUOR (MMUBASE + 0x04) /* Operation register */
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#define MMUSR (MMUBASE + 0x08) /* Status register */
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#define MMUAR (MMUBASE + 0x10) /* TLB Address register */
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#define MMUTR (MMUBASE + 0x14) /* TLB Tag register */
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#define MMUDR (MMUBASE + 0x18) /* TLB Data register */
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/*
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* MMU Control register bit flags
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*/
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#define MMUCR_EN 0x00000001 /* Virtual mode enable */
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#define MMUCR_ASM 0x00000002 /* Address space mode */
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/*
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* MMU Operation register.
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*/
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#define MMUOR_UAA 0x00000001 /* Update allocation address */
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#define MMUOR_ACC 0x00000002 /* TLB access */
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#define MMUOR_RD 0x00000004 /* TLB access read */
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#define MMUOR_WR 0x00000000 /* TLB access write */
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#define MMUOR_ADR 0x00000008 /* TLB address select */
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#define MMUOR_ITLB 0x00000010 /* ITLB operation */
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#define MMUOR_CAS 0x00000020 /* Clear non-locked ASID TLBs */
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#define MMUOR_CNL 0x00000040 /* Clear non-locked TLBs */
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#define MMUOR_CA 0x00000080 /* Clear all TLBs */
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#define MMUOR_STLB 0x00000100 /* Search TLBs */
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#define MMUOR_AAN 16 /* TLB allocation address */
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#define MMUOR_AAMASK 0xffff0000 /* AA mask */
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/*
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* MMU Status register.
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*/
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#define MMUSR_HIT 0x00000002 /* Search TLB hit */
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#define MMUSR_WF 0x00000008 /* Write access fault */
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#define MMUSR_RF 0x00000010 /* Read access fault */
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#define MMUSR_SPF 0x00000020 /* Supervisor protect fault */
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/*
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* MMU Read/Write Tag register.
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*/
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#define MMUTR_V 0x00000001 /* Valid */
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#define MMUTR_SG 0x00000002 /* Shared global */
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#define MMUTR_IDN 2 /* Address Space ID */
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#define MMUTR_IDMASK 0x000003fc /* ASID mask */
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#define MMUTR_VAN 10 /* Virtual Address */
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#define MMUTR_VAMASK 0xfffffc00 /* VA mask */
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/*
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* MMU Read/Write Data register.
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*/
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#define MMUDR_LK 0x00000002 /* Lock entry */
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#define MMUDR_X 0x00000004 /* Execute access enable */
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#define MMUDR_W 0x00000008 /* Write access enable */
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#define MMUDR_R 0x00000010 /* Read access enable */
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#define MMUDR_SP 0x00000020 /* Supervisor access enable */
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#define MMUDR_CM_CWT 0x00000000 /* Cachable write thru */
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#define MMUDR_CM_CCB 0x00000040 /* Cachable copy back */
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#define MMUDR_CM_NCP 0x00000080 /* Non-cachable precise */
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#define MMUDR_CM_NCI 0x000000c0 /* Non-cachable imprecise */
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#define MMUDR_SZ_1MB 0x00000000 /* 1MB page size */
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#define MMUDR_SZ_4KB 0x00000100 /* 4kB page size */
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#define MMUDR_SZ_8KB 0x00000200 /* 8kB page size */
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#define MMUDR_SZ_1KB 0x00000300 /* 1kB page size */
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#define MMUDR_PAN 10 /* Physical address */
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#define MMUDR_PAMASK 0xfffffc00 /* PA mask */
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#ifndef __ASSEMBLY__
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/*
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* Simple access functions for the MMU registers. Nothing fancy
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* currently required, just simple 32bit access.
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*/
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static inline u32 mmu_read(u32 a)
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{
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return *((volatile u32 *) a);
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}
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static inline void mmu_write(u32 a, u32 v)
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{
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*((volatile u32 *) a) = v;
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__asm__ __volatile__ ("nop");
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}
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void cf_bootmem_alloc(void);
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void cf_mmu_context_init(void);
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int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word);
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#endif
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#endif /* MCFMMU_H */
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