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/*

 * Definitions for Sun3 custom MMU.

 */

#include <asm/movs.h>

#ifndef __SUN3_MMU_H__

#define __SUN3_MMU_H__

#define FC_CONTROL 3

/* MMU characteristics. */

#define SUN3_SEGMAPS_PER_CONTEXT        2048

#define SUN3_PMEGS_NUM                  256

#define SUN3_CONTEXTS_NUM               8

#define SUN3_PMEG_SIZE_BITS      17

#define SUN3_PMEG_SIZE           (1 << SUN3_PMEG_SIZE_BITS)

#define SUN3_PMEG_MASK           (SUN3_PMEG_SIZE - 1)

#define SUN3_PTE_SIZE_BITS       13

#define SUN3_PTE_SIZE            (1 << SUN3_PTE_SIZE_BITS)

#define SUN3_PTE_MASK            (SUN3_PTE_SIZE - 1)

#define SUN3_CONTROL_MASK       (0x0FFFFFFC)

#define SUN3_INVALID_PMEG       255

#define SUN3_INVALID_CONTEXT 255

#define AC_IDPROM     0x00000000    /* 34  ID PROM, R/O, byte, 32 bytes      */

#define AC_PAGEMAP    0x10000000    /* 3   Pagemap R/W, long                 */

#define AC_SEGMAP     0x20000000    /* 3   Segment map, byte                 */

#define AC_CONTEXT    0x30000000    /* 34c current mmu-context               */

#define AC_SENABLE    0x40000000    /* 34c system dvma/cache/reset enable reg*/

#define AC_UDVMA_ENB  0x50000000    /* 34  Not used on Sun boards, byte      */

#define AC_BUS_ERROR  0x60000000    /* 34  Cleared on read, byte.            */

#define AC_SYNC_ERR   0x60000000    /*   c fault type                        */

#define AC_SYNC_VA    0x60000004    /*   c fault virtual address             */

#define AC_ASYNC_ERR  0x60000008    /*   c asynchronous fault type           */

#define AC_ASYNC_VA   0x6000000c    /*   c async fault virtual address       */

#define AC_LEDS       0x70000000    /* 34  Zero turns on LEDs, byte          */

#define AC_CACHETAGS  0x80000000    /* 34c direct access to the VAC tags     */

#define AC_CACHEDDATA 0x90000000    /* 3 c direct access to the VAC data     */

#define AC_UDVMA_MAP  0xD0000000    /* 4   Not used on Sun boards, byte      */

#define AC_VME_VECTOR 0xE0000000    /* 4   For non-Autovector VME, byte      */

#define AC_BOOT_SCC   0xF0000000    /* 34  bypass to access Zilog 8530. byte.*/

#define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \

                            | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)

/* Bus access type within PTE. */

#define SUN3_PAGE_TYPE_MASK   (0x0c000000)

#define SUN3_PAGE_TYPE_MEMORY (0x00000000)

#define SUN3_PAGE_TYPE_IO     (0x04000000)

#define SUN3_PAGE_TYPE_VME16  (0x08000000)

#define SUN3_PAGE_TYPE_VME32  (0x0c000000)

/* Mask for page number within PTE. */

#define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)

/* Bits within bus-error register. */

#define SUN3_BUSERR_WATCHDOG    (0x01)

#define SUN3_BUSERR_unused      (0x02)

#define SUN3_BUSERR_FPAENERR    (0x04)

#define SUN3_BUSERR_FPABERR     (0x08)

#define SUN3_BUSERR_VMEBERR     (0x10)

#define SUN3_BUSERR_TIMEOUT     (0x20)

#define SUN3_BUSERR_PROTERR     (0x40)

#define SUN3_BUSERR_INVALID     (0x80)

#ifndef __ASSEMBLY__

/* Read bus error status register (implicitly clearing it). */

static inline unsigned char sun3_get_buserr(void)

{

        unsigned char sfc, c;

        GET_SFC (sfc);

        SET_SFC (FC_CONTROL);

        GET_CONTROL_BYTE (AC_BUS_ERROR, c);

        SET_SFC (sfc);

        return c;

}

/* Read segmap from hardware MMU. */

static inline unsigned long sun3_get_segmap(unsigned long addr)

{

        register unsigned long entry;

        unsigned char c, sfc;

        GET_SFC (sfc);

        SET_SFC (FC_CONTROL);

        GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);

        SET_SFC (sfc);

        entry = c;

        return entry;

}

/* Write segmap to hardware MMU. */

static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)

{

        unsigned char sfc;

        GET_DFC (sfc);

        SET_DFC (FC_CONTROL);

        SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);

        SET_DFC (sfc);

        return;

}

/* Read PTE from hardware MMU. */

static inline unsigned long sun3_get_pte(unsigned long addr)

{

        register unsigned long entry;

        unsigned char sfc;

        GET_SFC (sfc);

        SET_SFC (FC_CONTROL);

        GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);

        SET_SFC (sfc);

        return entry;

}

/* Write PTE to hardware MMU. */

static inline void sun3_put_pte(unsigned long addr, unsigned long entry)

{

        unsigned char sfc;

        GET_DFC (sfc);

        SET_DFC (FC_CONTROL);

        SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);

        SET_DFC (sfc);

        return;

}

/* get current context */

static inline unsigned char sun3_get_context(void)

{

        unsigned char sfc, c;

        GET_SFC(sfc);

        SET_SFC(FC_CONTROL);

        GET_CONTROL_BYTE(AC_CONTEXT, c);

        SET_SFC(sfc);

        return c;

}

/* set alternate context */

static inline void sun3_put_context(unsigned char c)

{

        unsigned char dfc;

        GET_DFC(dfc);

        SET_DFC(FC_CONTROL);

        SET_CONTROL_BYTE(AC_CONTEXT, c);

        SET_DFC(dfc);

        return;

}

extern void *sun3_ioremap(unsigned long phys, unsigned long size,

                          unsigned long type);

extern int sun3_map_test(unsigned long addr, char *val);

#endif  /* !__ASSEMBLY__ */

#endif  /* !__SUN3_MMU_H__ */