arch/m68k/include/asm/sun3mmu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Definitions for Sun3 custom MMU.
   4  */
   5 #ifndef __SUN3_MMU_H__
   6 #define __SUN3_MMU_H__
   7
   8 #include <linux/types.h>
   9 #include <asm/movs.h>
  10 #include <asm/sun3-head.h>
  11
  12 /* MMU characteristics. */
  13 #define SUN3_SEGMAPS_PER_CONTEXT        2048
  14 #define SUN3_PMEGS_NUM                  256
  15 #define SUN3_CONTEXTS_NUM               8
  16
  17 #define SUN3_PMEG_SIZE_BITS      17
  18 #define SUN3_PMEG_SIZE           (1 << SUN3_PMEG_SIZE_BITS)
  19 #define SUN3_PMEG_MASK           (SUN3_PMEG_SIZE - 1)
  20
  21 #define SUN3_PTE_SIZE_BITS       13
  22 #define SUN3_PTE_SIZE            (1 << SUN3_PTE_SIZE_BITS)
  23 #define SUN3_PTE_MASK            (SUN3_PTE_SIZE - 1)
  24
  25 #define SUN3_CONTROL_MASK       (0x0FFFFFFC)
  26 #define SUN3_INVALID_PMEG       255
  27 #define SUN3_INVALID_CONTEXT 255
  28
  29 #define AC_IDPROM     0x00000000    /* 34  ID PROM, R/O, byte, 32 bytes      */
  30 #define AC_PAGEMAP    0x10000000    /* 3   Pagemap R/W, long                 */
  31 #define AC_SEGMAP     0x20000000    /* 3   Segment map, byte                 */
  32 #define AC_CONTEXT    0x30000000    /* 34c current mmu-context               */
  33 #define AC_SENABLE    0x40000000    /* 34c system dvma/cache/reset enable reg*/
  34 #define AC_UDVMA_ENB  0x50000000    /* 34  Not used on Sun boards, byte      */
  35 #define AC_BUS_ERROR  0x60000000    /* 34  Cleared on read, byte.            */
  36 #define AC_SYNC_ERR   0x60000000    /*   c fault type                        */
  37 #define AC_SYNC_VA    0x60000004    /*   c fault virtual address             */
  38 #define AC_ASYNC_ERR  0x60000008    /*   c asynchronous fault type           */
  39 #define AC_ASYNC_VA   0x6000000c    /*   c async fault virtual address       */
  40 #define AC_LEDS       0x70000000    /* 34  Zero turns on LEDs, byte          */
  41 #define AC_CACHETAGS  0x80000000    /* 34c direct access to the VAC tags     */
  42 #define AC_CACHEDDATA 0x90000000    /* 3 c direct access to the VAC data     */
  43 #define AC_UDVMA_MAP  0xD0000000    /* 4   Not used on Sun boards, byte      */
  44 #define AC_VME_VECTOR 0xE0000000    /* 4   For non-Autovector VME, byte      */
  45 #define AC_BOOT_SCC   0xF0000000    /* 34  bypass to access Zilog 8530. byte.*/
  46
  47 #define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
  48                             | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)
  49
  50 /* Bus access type within PTE. */
  51 #define SUN3_PAGE_TYPE_MASK   (0x0c000000)
  52 #define SUN3_PAGE_TYPE_MEMORY (0x00000000)
  53 #define SUN3_PAGE_TYPE_IO     (0x04000000)
  54 #define SUN3_PAGE_TYPE_VME16  (0x08000000)
  55 #define SUN3_PAGE_TYPE_VME32  (0x0c000000)
  56
  57 /* Mask for page number within PTE. */
  58 #define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)
  59
  60 /* Bits within bus-error register. */
  61 #define SUN3_BUSERR_WATCHDOG    (0x01)
  62 #define SUN3_BUSERR_unused      (0x02)
  63 #define SUN3_BUSERR_FPAENERR    (0x04)
  64 #define SUN3_BUSERR_FPABERR     (0x08)
  65 #define SUN3_BUSERR_VMEBERR     (0x10)
  66 #define SUN3_BUSERR_TIMEOUT     (0x20)
  67 #define SUN3_BUSERR_PROTERR     (0x40)
  68 #define SUN3_BUSERR_INVALID     (0x80)
  69
  70 #ifndef __ASSEMBLY__
  71
  72 /* Read bus error status register (implicitly clearing it). */
  73 static inline unsigned char sun3_get_buserr(void)
  74 {
  75         unsigned char sfc, c;
  76
  77         GET_SFC (sfc);
  78         SET_SFC (FC_CONTROL);
  79         GET_CONTROL_BYTE (AC_BUS_ERROR, c);
  80         SET_SFC (sfc);
  81
  82         return c;
  83 }
  84
  85 /* Read segmap from hardware MMU. */
  86 static inline unsigned long sun3_get_segmap(unsigned long addr)
  87 {
  88         register unsigned long entry;
  89         unsigned char c, sfc;
  90
  91         GET_SFC (sfc);
  92         SET_SFC (FC_CONTROL);
  93         GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
  94         SET_SFC (sfc);
  95         entry = c;
  96
  97         return entry;
  98 }
  99
 100 /* Write segmap to hardware MMU. */
 101 static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
 102 {
 103         unsigned char sfc;
 104
 105         GET_DFC (sfc);
 106         SET_DFC (FC_CONTROL);
 107         SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
 108         SET_DFC (sfc);
 109
 110         return;
 111 }
 112
 113 /* Read PTE from hardware MMU. */
 114 static inline unsigned long sun3_get_pte(unsigned long addr)
 115 {
 116         register unsigned long entry;
 117         unsigned char sfc;
 118
 119         GET_SFC (sfc);
 120         SET_SFC (FC_CONTROL);
 121         GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
 122         SET_SFC (sfc);
 123
 124         return entry;
 125 }
 126
 127 /* Write PTE to hardware MMU. */
 128 static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
 129 {
 130         unsigned char sfc;
 131
 132         GET_DFC (sfc);
 133         SET_DFC (FC_CONTROL);
 134         SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
 135         SET_DFC (sfc);
 136
 137         return;
 138 }
 139
 140 /* get current context */
 141 static inline unsigned char sun3_get_context(void)
 142 {
 143         unsigned char sfc, c;
 144
 145         GET_SFC(sfc);
 146         SET_SFC(FC_CONTROL);
 147         GET_CONTROL_BYTE(AC_CONTEXT, c);
 148         SET_SFC(sfc);
 149
 150         return c;
 151 }
 152
 153 /* set alternate context */
 154 static inline void sun3_put_context(unsigned char c)
 155 {
 156         unsigned char dfc;
 157         GET_DFC(dfc);
 158         SET_DFC(FC_CONTROL);
 159         SET_CONTROL_BYTE(AC_CONTEXT, c);
 160         SET_DFC(dfc);
 161
 162         return;
 163 }
 164
 165 extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
 166                           unsigned long type);
 167
 168 extern int sun3_map_test(unsigned long addr, char *val);
 169
 170 #endif  /* !__ASSEMBLY__ */
 171
 172 #endif  /* !__SUN3_MMU_H__ */