173 lines
4.9 KiB
C
173 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Definitions for Sun3 custom MMU.
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*/
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#ifndef __SUN3_MMU_H__
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#define __SUN3_MMU_H__
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#include <linux/types.h>
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#include <asm/movs.h>
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#include <asm/sun3-head.h>
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/* MMU characteristics. */
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#define SUN3_SEGMAPS_PER_CONTEXT 2048
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#define SUN3_PMEGS_NUM 256
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#define SUN3_CONTEXTS_NUM 8
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#define SUN3_PMEG_SIZE_BITS 17
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#define SUN3_PMEG_SIZE (1 << SUN3_PMEG_SIZE_BITS)
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#define SUN3_PMEG_MASK (SUN3_PMEG_SIZE - 1)
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#define SUN3_PTE_SIZE_BITS 13
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#define SUN3_PTE_SIZE (1 << SUN3_PTE_SIZE_BITS)
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#define SUN3_PTE_MASK (SUN3_PTE_SIZE - 1)
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#define SUN3_CONTROL_MASK (0x0FFFFFFC)
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#define SUN3_INVALID_PMEG 255
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#define SUN3_INVALID_CONTEXT 255
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#define AC_IDPROM 0x00000000 /* 34 ID PROM, R/O, byte, 32 bytes */
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#define AC_PAGEMAP 0x10000000 /* 3 Pagemap R/W, long */
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#define AC_SEGMAP 0x20000000 /* 3 Segment map, byte */
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#define AC_CONTEXT 0x30000000 /* 34c current mmu-context */
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#define AC_SENABLE 0x40000000 /* 34c system dvma/cache/reset enable reg*/
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#define AC_UDVMA_ENB 0x50000000 /* 34 Not used on Sun boards, byte */
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#define AC_BUS_ERROR 0x60000000 /* 34 Cleared on read, byte. */
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#define AC_SYNC_ERR 0x60000000 /* c fault type */
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#define AC_SYNC_VA 0x60000004 /* c fault virtual address */
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#define AC_ASYNC_ERR 0x60000008 /* c asynchronous fault type */
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#define AC_ASYNC_VA 0x6000000c /* c async fault virtual address */
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#define AC_LEDS 0x70000000 /* 34 Zero turns on LEDs, byte */
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#define AC_CACHETAGS 0x80000000 /* 34c direct access to the VAC tags */
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#define AC_CACHEDDATA 0x90000000 /* 3 c direct access to the VAC data */
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#define AC_UDVMA_MAP 0xD0000000 /* 4 Not used on Sun boards, byte */
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#define AC_VME_VECTOR 0xE0000000 /* 4 For non-Autovector VME, byte */
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#define AC_BOOT_SCC 0xF0000000 /* 34 bypass to access Zilog 8530. byte.*/
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#define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
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| SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)
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/* Bus access type within PTE. */
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#define SUN3_PAGE_TYPE_MASK (0x0c000000)
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#define SUN3_PAGE_TYPE_MEMORY (0x00000000)
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#define SUN3_PAGE_TYPE_IO (0x04000000)
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#define SUN3_PAGE_TYPE_VME16 (0x08000000)
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#define SUN3_PAGE_TYPE_VME32 (0x0c000000)
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/* Mask for page number within PTE. */
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#define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)
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/* Bits within bus-error register. */
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#define SUN3_BUSERR_WATCHDOG (0x01)
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#define SUN3_BUSERR_unused (0x02)
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#define SUN3_BUSERR_FPAENERR (0x04)
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#define SUN3_BUSERR_FPABERR (0x08)
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#define SUN3_BUSERR_VMEBERR (0x10)
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#define SUN3_BUSERR_TIMEOUT (0x20)
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#define SUN3_BUSERR_PROTERR (0x40)
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#define SUN3_BUSERR_INVALID (0x80)
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#ifndef __ASSEMBLY__
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/* Read bus error status register (implicitly clearing it). */
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static inline unsigned char sun3_get_buserr(void)
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{
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unsigned char sfc, c;
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GET_SFC (sfc);
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SET_SFC (FC_CONTROL);
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GET_CONTROL_BYTE (AC_BUS_ERROR, c);
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SET_SFC (sfc);
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return c;
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}
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/* Read segmap from hardware MMU. */
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static inline unsigned long sun3_get_segmap(unsigned long addr)
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{
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register unsigned long entry;
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unsigned char c, sfc;
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GET_SFC (sfc);
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SET_SFC (FC_CONTROL);
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GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
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SET_SFC (sfc);
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entry = c;
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return entry;
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}
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/* Write segmap to hardware MMU. */
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static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
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{
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unsigned char sfc;
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GET_DFC (sfc);
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SET_DFC (FC_CONTROL);
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SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
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SET_DFC (sfc);
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return;
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}
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/* Read PTE from hardware MMU. */
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static inline unsigned long sun3_get_pte(unsigned long addr)
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{
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register unsigned long entry;
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unsigned char sfc;
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GET_SFC (sfc);
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SET_SFC (FC_CONTROL);
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GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
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SET_SFC (sfc);
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return entry;
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}
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/* Write PTE to hardware MMU. */
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static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
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{
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unsigned char sfc;
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GET_DFC (sfc);
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SET_DFC (FC_CONTROL);
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SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
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SET_DFC (sfc);
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return;
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}
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/* get current context */
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static inline unsigned char sun3_get_context(void)
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{
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unsigned char sfc, c;
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GET_SFC(sfc);
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SET_SFC(FC_CONTROL);
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GET_CONTROL_BYTE(AC_CONTEXT, c);
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SET_SFC(sfc);
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return c;
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}
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/* set alternate context */
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static inline void sun3_put_context(unsigned char c)
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{
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unsigned char dfc;
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GET_DFC(dfc);
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SET_DFC(FC_CONTROL);
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SET_CONTROL_BYTE(AC_CONTEXT, c);
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SET_DFC(dfc);
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return;
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}
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extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
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unsigned long type);
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extern int sun3_map_test(unsigned long addr, char *val);
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#endif /* !__ASSEMBLY__ */
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#endif /* !__SUN3_MMU_H__ */
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