sun3mmu.h (5025B)
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__ */