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