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