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). */
73 static 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. */
86 static 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. */
101 static 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. */
114 static 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. */
128 static 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 */
141 static 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 */
154 static 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
165 extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
166 unsigned long type);
167
168 extern int sun3_map_test(unsigned long addr, char *val);
169
170 #endif /* !__ASSEMBLY__ */
171
172 #endif /* !__SUN3_MMU_H__ */
173
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