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). */
sun3_get_buserr(void)72 static 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. */
sun3_get_segmap(unsigned long addr)85 static 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. */
sun3_put_segmap(unsigned long addr,unsigned long entry)100 static 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. */
sun3_get_pte(unsigned long addr)113 static 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. */
sun3_put_pte(unsigned long addr,unsigned long entry)127 static 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 */
sun3_get_context(void)140 static 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 */
sun3_put_context(unsigned char c)153 static 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
164 extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
165 unsigned long type);
166
167 extern int sun3_map_test(unsigned long addr, char *val);
168
169 #endif /* !__ASSEMBLY__ */
170
171 #endif /* !__SUN3_MMU_H__ */
172