arch/m68k/include/asm/sun3mmu.h

   1 /*
   2  * Definitions for Sun3 custom MMU.
   3  */
   4 #ifndef __SUN3_MMU_H__
   5 #define __SUN3_MMU_H__
   6
   7 #include <linux/types.h>
   8 #include <asm/movs.h>
   9 #include <asm/sun3-head.h>
  10
  11 /* MMU characteristics. */
  12 #define SUN3_SEGMAPS_PER_CONTEXT        2048
  13 #define SUN3_PMEGS_NUM                  256
  14 #define SUN3_CONTEXTS_NUM               8
  15
  16 #define SUN3_PMEG_SIZE_BITS      17
  17 #define SUN3_PMEG_SIZE           (1 << SUN3_PMEG_SIZE_BITS)
  18 #define SUN3_PMEG_MASK           (SUN3_PMEG_SIZE - 1)
  19
  20 #define SUN3_PTE_SIZE_BITS       13
  21 #define SUN3_PTE_SIZE            (1 << SUN3_PTE_SIZE_BITS)
  22 #define SUN3_PTE_MASK            (SUN3_PTE_SIZE - 1)
  23
  24 #define SUN3_CONTROL_MASK       (0x0FFFFFFC)
  25 #define SUN3_INVALID_PMEG       255
  26 #define SUN3_INVALID_CONTEXT 255
  27
  28 #define AC_IDPROM     0x00000000    /* 34  ID PROM, R/O, byte, 32 bytes      */
  29 #define AC_PAGEMAP    0x10000000    /* 3   Pagemap R/W, long                 */
  30 #define AC_SEGMAP     0x20000000    /* 3   Segment map, byte                 */
  31 #define AC_CONTEXT    0x30000000    /* 34c current mmu-context               */
  32 #define AC_SENABLE    0x40000000    /* 34c system dvma/cache/reset enable reg*/
  33 #define AC_UDVMA_ENB  0x50000000    /* 34  Not used on Sun boards, byte      */
  34 #define AC_BUS_ERROR  0x60000000    /* 34  Cleared on read, byte.            */
  35 #define AC_SYNC_ERR   0x60000000    /*   c fault type                        */
  36 #define AC_SYNC_VA    0x60000004    /*   c fault virtual address             */
  37 #define AC_ASYNC_ERR  0x60000008    /*   c asynchronous fault type           */
  38 #define AC_ASYNC_VA   0x6000000c    /*   c async fault virtual address       */
  39 #define AC_LEDS       0x70000000    /* 34  Zero turns on LEDs, byte          */
  40 #define AC_CACHETAGS  0x80000000    /* 34c direct access to the VAC tags     */
  41 #define AC_CACHEDDATA 0x90000000    /* 3 c direct access to the VAC data     */
  42 #define AC_UDVMA_MAP  0xD0000000    /* 4   Not used on Sun boards, byte      */
  43 #define AC_VME_VECTOR 0xE0000000    /* 4   For non-Autovector VME, byte      */
  44 #define AC_BOOT_SCC   0xF0000000    /* 34  bypass to access Zilog 8530. byte.*/
  45
  46 #define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
  47                             | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)
  48
  49 /* Bus access type within PTE. */
  50 #define SUN3_PAGE_TYPE_MASK   (0x0c000000)
  51 #define SUN3_PAGE_TYPE_MEMORY (0x00000000)
  52 #define SUN3_PAGE_TYPE_IO     (0x04000000)
  53 #define SUN3_PAGE_TYPE_VME16  (0x08000000)
  54 #define SUN3_PAGE_TYPE_VME32  (0x0c000000)
  55
  56 /* Mask for page number within PTE. */
  57 #define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)
  58
  59 /* Bits within bus-error register. */
  60 #define SUN3_BUSERR_WATCHDOG    (0x01)
  61 #define SUN3_BUSERR_unused      (0x02)
  62 #define SUN3_BUSERR_FPAENERR    (0x04)
  63 #define SUN3_BUSERR_FPABERR     (0x08)
  64 #define SUN3_BUSERR_VMEBERR     (0x10)
  65 #define SUN3_BUSERR_TIMEOUT     (0x20)
  66 #define SUN3_BUSERR_PROTERR     (0x40)
  67 #define SUN3_BUSERR_INVALID     (0x80)
  68
  69 #ifndef __ASSEMBLY__
  70
  71 /* Read bus error status register (implicitly clearing it). */
  72 static inline unsigned char sun3_get_buserr(void)
  73 {
  74         unsigned char sfc, c;
  75
  76         GET_SFC (sfc);
  77         SET_SFC (FC_CONTROL);
  78         GET_CONTROL_BYTE (AC_BUS_ERROR, c);
  79         SET_SFC (sfc);
  80
  81         return c;
  82 }
  83
  84 /* Read segmap from hardware MMU. */
  85 static inline unsigned long sun3_get_segmap(unsigned long addr)
  86 {
  87         register unsigned long entry;
  88         unsigned char c, sfc;
  89
  90         GET_SFC (sfc);
  91         SET_SFC (FC_CONTROL);
  92         GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
  93         SET_SFC (sfc);
  94         entry = c;
  95
  96         return entry;
  97 }
  98
  99 /* Write segmap to hardware MMU. */
 100 static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
 101 {
 102         unsigned char sfc;
 103
 104         GET_DFC (sfc);
 105         SET_DFC (FC_CONTROL);
 106         SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
 107         SET_DFC (sfc);
 108
 109         return;
 110 }
 111
 112 /* Read PTE from hardware MMU. */
 113 static inline unsigned long sun3_get_pte(unsigned long addr)
 114 {
 115         register unsigned long entry;
 116         unsigned char sfc;
 117
 118         GET_SFC (sfc);
 119         SET_SFC (FC_CONTROL);
 120         GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
 121         SET_SFC (sfc);
 122
 123         return entry;
 124 }
 125
 126 /* Write PTE to hardware MMU. */
 127 static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
 128 {
 129         unsigned char sfc;
 130
 131         GET_DFC (sfc);
 132         SET_DFC (FC_CONTROL);
 133         SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
 134         SET_DFC (sfc);
 135
 136         return;
 137 }
 138
 139 /* get current context */
 140 static inline unsigned char sun3_get_context(void)
 141 {
 142         unsigned char sfc, c;
 143
 144         GET_SFC(sfc);
 145         SET_SFC(FC_CONTROL);
 146         GET_CONTROL_BYTE(AC_CONTEXT, c);
 147         SET_SFC(sfc);
 148
 149         return c;
 150 }
 151
 152 /* set alternate context */
 153 static inline void sun3_put_context(unsigned char c)
 154 {
 155         unsigned char dfc;
 156         GET_DFC(dfc);
 157         SET_DFC(FC_CONTROL);
 158         SET_CONTROL_BYTE(AC_CONTEXT, c);
 159         SET_DFC(dfc);
 160
 161         return;
 162 }
 163
 164 extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
 165                           unsigned long type);
 166
 167 extern int sun3_map_test(unsigned long addr, char *val);
 168
 169 #endif  /* !__ASSEMBLY__ */
 170
 171 #endif  /* !__SUN3_MMU_H__ */