LXR linux/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). */
  72static 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. */
  85static 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. */
 100static 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. */
 113static 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. */
 127static 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 */
 140static 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 */
 153static 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
 164extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
 165                          unsigned long type);
 166
 167extern int sun3_map_test(unsigned long addr, char *val);
 168
 169#endif  /* !__ASSEMBLY__ */
 170
 171#endif  /* !__SUN3_MMU_H__ */
 172