arch/m68k/include/asm/mcfmmu.h

   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  */
  97 static inline u32 mmu_read(u32 a)
  98 {
  99         return *((volatile u32 *) a);
 100 }
 101
 102 static inline void mmu_write(u32 a, u32 v)
 103 {
 104         *((volatile u32 *) a) = v;
 105         __asm__ __volatile__ ("nop");
 106 }
 107
 108 int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word);
 109
 110 #endif
 111
 112 #endif  /* MCFMMU_H */