1 /* 2 * mcfmmu.h -- definitions for the ColdFire v4e MMU 3 * 4 * (C) Copyright 2011, Greg Ungerer <gerg@uclinux.org> 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 */ 10 11 #ifndef MCFMMU_H 12 #define MCFMMU_H 13 14 /* 15 * The MMU support registers are mapped into the address space using 16 * the processor MMUBASE register. We used a fixed address for mapping, 17 * there doesn't seem any need to make this configurable yet. 18 */ 19 #define MMUBASE 0xfe000000 20 21 /* 22 * The support registers of the MMU. Names are the sames as those 23 * used in the Freescale v4e documentation. 24 */ 25 #define MMUCR (MMUBASE + 0x00) /* Control register */ 26 #define MMUOR (MMUBASE + 0x04) /* Operation register */ 27 #define MMUSR (MMUBASE + 0x08) /* Status register */ 28 #define MMUAR (MMUBASE + 0x10) /* TLB Address register */ 29 #define MMUTR (MMUBASE + 0x14) /* TLB Tag register */ 30 #define MMUDR (MMUBASE + 0x18) /* TLB Data register */ 31 32 /* 33 * MMU Control register bit flags 34 */ 35 #define MMUCR_EN 0x00000001 /* Virtual mode enable */ 36 #define MMUCR_ASM 0x00000002 /* Address space mode */ 37 38 /* 39 * MMU Operation register. 40 */ 41 #define MMUOR_UAA 0x00000001 /* Update allocation address */ 42 #define MMUOR_ACC 0x00000002 /* TLB access */ 43 #define MMUOR_RD 0x00000004 /* TLB access read */ 44 #define MMUOR_WR 0x00000000 /* TLB access write */ 45 #define MMUOR_ADR 0x00000008 /* TLB address select */ 46 #define MMUOR_ITLB 0x00000010 /* ITLB operation */ 47 #define MMUOR_CAS 0x00000020 /* Clear non-locked ASID TLBs */ 48 #define MMUOR_CNL 0x00000040 /* Clear non-locked TLBs */ 49 #define MMUOR_CA 0x00000080 /* Clear all TLBs */ 50 #define MMUOR_STLB 0x00000100 /* Search TLBs */ 51 #define MMUOR_AAN 16 /* TLB allocation address */ 52 #define MMUOR_AAMASK 0xffff0000 /* AA mask */ 53 54 /* 55 * MMU Status register. 56 */ 57 #define MMUSR_HIT 0x00000002 /* Search TLB hit */ 58 #define MMUSR_WF 0x00000008 /* Write access fault */ 59 #define MMUSR_RF 0x00000010 /* Read access fault */ 60 #define MMUSR_SPF 0x00000020 /* Supervisor protect fault */ 61 62 /* 63 * MMU Read/Write Tag register. 64 */ 65 #define MMUTR_V 0x00000001 /* Valid */ 66 #define MMUTR_SG 0x00000002 /* Shared global */ 67 #define MMUTR_IDN 2 /* Address Space ID */ 68 #define MMUTR_IDMASK 0x000003fc /* ASID mask */ 69 #define MMUTR_VAN 10 /* Virtual Address */ 70 #define MMUTR_VAMASK 0xfffffc00 /* VA mask */ 71 72 /* 73 * MMU Read/Write Data register. 74 */ 75 #define MMUDR_LK 0x00000002 /* Lock entry */ 76 #define MMUDR_X 0x00000004 /* Execute access enable */ 77 #define MMUDR_W 0x00000008 /* Write access enable */ 78 #define MMUDR_R 0x00000010 /* Read access enable */ 79 #define MMUDR_SP 0x00000020 /* Supervisor access enable */ 80 #define MMUDR_CM_CWT 0x00000000 /* Cachable write thru */ 81 #define MMUDR_CM_CCB 0x00000040 /* Cachable copy back */ 82 #define MMUDR_CM_NCP 0x00000080 /* Non-cachable precise */ 83 #define MMUDR_CM_NCI 0x000000c0 /* Non-cachable imprecise */ 84 #define MMUDR_SZ_1MB 0x00000000 /* 1MB page size */ 85 #define MMUDR_SZ_4KB 0x00000100 /* 4kB page size */ 86 #define MMUDR_SZ_8KB 0x00000200 /* 8kB page size */ 87 #define MMUDR_SZ_1KB 0x00000300 /* 1kB page size */ 88 #define MMUDR_PAN 10 /* Physical address */ 89 #define MMUDR_PAMASK 0xfffffc00 /* PA mask */ 90 91 #ifndef __ASSEMBLY__ 92 93 /* 94 * Simple access functions for the MMU registers. Nothing fancy 95 * currently required, just simple 32bit access. 96 */ mmu_read(u32 a)97static inline u32 mmu_read(u32 a) 98 { 99 return *((volatile u32 *) a); 100 } 101 mmu_write(u32 a,u32 v)102static inline void mmu_write(u32 a, u32 v) 103 { 104 *((volatile u32 *) a) = v; 105 __asm__ __volatile__ ("nop"); 106 } 107 108 void cf_bootmem_alloc(void); 109 void cf_mmu_context_init(void); 110 int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word); 111 112 #endif 113 114 #endif /* MCFMMU_H */ 115