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 */
31static 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 */
40static 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
48static 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
56static 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
64static 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. */
75static 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
83static 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
91static 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
99static 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