arch/m68k/include/asm/m53xxacr.h

   1 /****************************************************************************/
   2
   3 /*
   4  * m53xxacr.h -- ColdFire version 3 core cache support
   5  *
   6  * (C) Copyright 2010, Greg Ungerer <gerg@snapgear.com>
   7  */
   8
   9 /****************************************************************************/
  10 #ifndef m53xxacr_h
  11 #define m53xxacr_h
  12 /****************************************************************************/
  13
  14 /*
  15  * All varients of the ColdFire using version 3 cores have a similar
  16  * cache setup. They have a unified instruction and data cache, with
  17  * configurable write-through or copy-back operation.
  18  */
  19
  20 /*
  21  * Define the Cache Control register flags.
  22  */
  23 #define CACR_EC         0x80000000      /* Enable cache */
  24 #define CACR_ESB        0x20000000      /* Enable store buffer */
  25 #define CACR_DPI        0x10000000      /* Disable invalidation by CPUSHL */
  26 #define CACR_HLCK       0x08000000      /* Half cache lock mode */
  27 #define CACR_CINVA      0x01000000      /* Invalidate cache */
  28 #define CACR_DNFB       0x00000400      /* Inhibited fill buffer */
  29 #define CACR_DCM_WT     0x00000000      /* Cacheable write-through */
  30 #define CACR_DCM_CB     0x00000100      /* Cacheable copy-back */
  31 #define CACR_DCM_PRE    0x00000200      /* Cache inhibited, precise */
  32 #define CACR_DCM_IMPRE  0x00000300      /* Cache inhibited, imprecise */
  33 #define CACR_WPROTECT   0x00000020      /* Write protect*/
  34 #define CACR_EUSP       0x00000010      /* Eanble separate user a7 */
  35
  36 /*
  37  * Define the Access Control register flags.
  38  */
  39 #define ACR_BASE_POS    24              /* Address Base (upper 8 bits) */
  40 #define ACR_MASK_POS    16              /* Address Mask (next 8 bits) */
  41 #define ACR_ENABLE      0x00008000      /* Enable this ACR */
  42 #define ACR_USER        0x00000000      /* Allow only user accesses */
  43 #define ACR_SUPER       0x00002000      /* Allow supervisor access only */
  44 #define ACR_ANY         0x00004000      /* Allow any access type */
  45 #define ACR_CM_WT       0x00000000      /* Cacheable, write-through */
  46 #define ACR_CM_CB       0x00000020      /* Cacheable, copy-back */
  47 #define ACR_CM_PRE      0x00000040      /* Cache inhibited, precise */
  48 #define ACR_CM_IMPRE    0x00000060      /* Cache inhibited, imprecise */
  49 #define ACR_WPROTECT    0x00000004      /* Write protect region */
  50
  51 /*
  52  * Define the cache type and arrangement (needed for pushes).
  53  */
  54 #if defined(CONFIG_M5307)
  55 #define CACHE_SIZE      0x2000          /* 8k of unified cache */
  56 #define ICACHE_SIZE     CACHE_SIZE
  57 #define DCACHE_SIZE     CACHE_SIZE
  58 #elif defined(CONFIG_M532x)
  59 #define CACHE_SIZE      0x4000          /* 32k of unified cache */
  60 #define ICACHE_SIZE     CACHE_SIZE
  61 #define DCACHE_SIZE     CACHE_SIZE
  62 #endif
  63
  64 #define CACHE_LINE_SIZE 16              /* 16 byte line size */
  65 #define CACHE_WAYS      4               /* 4 ways - set associative */
  66
  67 /*
  68  * Set the cache controller settings we will use. This default in the
  69  * CACR is cache inhibited, we use the ACR register to set cacheing
  70  * enabled on the regions we want (eg RAM).
  71  */
  72 #if defined(CONFIG_CACHE_COPYBACK)
  73 #define CACHE_TYPE      ACR_CM_CB
  74 #define CACHE_PUSH
  75 #else
  76 #define CACHE_TYPE      ACR_CM_WT
  77 #endif
  78
  79 #ifdef CONFIG_COLDFIRE_SW_A7
  80 #define CACHE_MODE      (CACR_EC + CACR_ESB + CACR_DCM_PRE)
  81 #else
  82 #define CACHE_MODE      (CACR_EC + CACR_ESB + CACR_DCM_PRE + CACR_EUSP)
  83 #endif
  84
  85 /*
  86  * Unified cache means we will never need to flush for coherency of
  87  * instruction fetch. We will need to flush to maintain memory/DMA
  88  * coherency though in all cases. And for copyback caches we will need
  89  * to push cached data as well.
  90  */
  91 #define CACHE_INIT        CACR_CINVA
  92 #define CACHE_INVALIDATE  CACR_CINVA
  93 #define CACHE_INVALIDATED CACR_CINVA
  94
  95 #define ACR0_MODE       ((CONFIG_RAMBASE & 0xff000000) + \
  96                          (0x000f0000) + \
  97                          (ACR_ENABLE + ACR_ANY + CACHE_TYPE))
  98 #define ACR1_MODE       0
  99
 100 /****************************************************************************/
 101 #endif  /* m53xxsim_h */