1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* swift.h: Specific definitions for the _broken_ Swift SRMMU
3 * MMU module.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #ifndef _SPARC_SWIFT_H
9 #define _SPARC_SWIFT_H
10
11 /* Swift is so brain damaged, here is the mmu control register. */
12 #define SWIFT_ST 0x00800000 /* SW tablewalk enable */
13 #define SWIFT_WP 0x00400000 /* Watchpoint enable */
14
15 /* Branch folding (buggy, disable on production systems!) */
16 #define SWIFT_BF 0x00200000
17 #define SWIFT_PMC 0x00180000 /* Page mode control */
18 #define SWIFT_PE 0x00040000 /* Parity enable */
19 #define SWIFT_PC 0x00020000 /* Parity control */
20 #define SWIFT_AP 0x00010000 /* Graphics page mode control (TCX/SX) */
21 #define SWIFT_AC 0x00008000 /* Alternate Cacheability (see viking.h) */
22 #define SWIFT_BM 0x00004000 /* Boot mode */
23 #define SWIFT_RC 0x00003c00 /* DRAM refresh control */
24 #define SWIFT_IE 0x00000200 /* Instruction cache enable */
25 #define SWIFT_DE 0x00000100 /* Data cache enable */
26 #define SWIFT_SA 0x00000080 /* Store Allocate */
27 #define SWIFT_NF 0x00000002 /* No fault mode */
28 #define SWIFT_EN 0x00000001 /* MMU enable */
29
30 /* Bits [13:5] select one of 512 instruction cache tags */
31 static inline void swift_inv_insn_tag(unsigned long addr)
32 {
33 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
34 : /* no outputs */
35 : "r" (addr), "i" (ASI_M_TXTC_TAG)
36 : "memory");
37 }
38
39 /* Bits [12:4] select one of 512 data cache tags */
40 static inline void swift_inv_data_tag(unsigned long addr)
41 {
42 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
43 : /* no outputs */
44 : "r" (addr), "i" (ASI_M_DATAC_TAG)
45 : "memory");
46 }
47
48 static inline void swift_flush_dcache(void)
49 {
50 unsigned long addr;
51
52 for (addr = 0; addr < 0x2000; addr += 0x10)
53 swift_inv_data_tag(addr);
54 }
55
56 static inline void swift_flush_icache(void)
57 {
58 unsigned long addr;
59
60 for (addr = 0; addr < 0x4000; addr += 0x20)
61 swift_inv_insn_tag(addr);
62 }
63
64 static inline void swift_idflash_clear(void)
65 {
66 unsigned long addr;
67
68 for (addr = 0; addr < 0x2000; addr += 0x10) {
69 swift_inv_insn_tag(addr<<1);
70 swift_inv_data_tag(addr);
71 }
72 }
73
74 /* Swift is so broken, it isn't even safe to use the following. */
75 static inline void swift_flush_page(unsigned long page)
76 {
77 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
78 : /* no outputs */
79 : "r" (page), "i" (ASI_M_FLUSH_PAGE)
80 : "memory");
81 }
82
83 static inline void swift_flush_segment(unsigned long addr)
84 {
85 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
86 : /* no outputs */
87 : "r" (addr), "i" (ASI_M_FLUSH_SEG)
88 : "memory");
89 }
90
91 static inline void swift_flush_region(unsigned long addr)
92 {
93 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
94 : /* no outputs */
95 : "r" (addr), "i" (ASI_M_FLUSH_REGION)
96 : "memory");
97 }
98
99 static inline void swift_flush_context(void)
100 {
101 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"
102 : /* no outputs */
103 : "i" (ASI_M_FLUSH_CTX)
104 : "memory");
105 }
106
107 #endif /* !(_SPARC_SWIFT_H) */
108
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