LXR linux/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). */
  73static 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. */
  86static 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. */
 101static 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. */
 114static 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. */
 128static 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 */
 141static 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 */
 154static 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
 165extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
 166                          unsigned long type);
 167
 168extern int sun3_map_test(unsigned long addr, char *val);
 169
 170#endif  /* !__ASSEMBLY__ */
 171
 172#endif  /* !__SUN3_MMU_H__ */
 173