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). */
sun3_get_buserr(void)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. */
sun3_get_segmap(unsigned long addr)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. */
sun3_put_segmap(unsigned long addr,unsigned long entry)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. */
sun3_get_pte(unsigned long addr)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. */
sun3_put_pte(unsigned long addr,unsigned long entry)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 */
sun3_get_context(void)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 */
sun3_put_context(unsigned char c)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